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802.0503 | Martin A. Guerrero | Martin A. Guerrero (1), and You-Hua Chu (2) ((1) Instituto de
Astrofisica de Andalucia, Spain, (2) University of Illinois at
Urbana-Champaign, USA) | An X-ray Survey of Wolf-Rayet Stars in the Magellanic Clouds. I. The
Chandra ACIS Dataset | To appear in The Astrophysical Journal Supplement. A version with
full resolution figures can be obtained upon request to [email protected] | null | 10.1086/587059 | null | astro-ph | null | Wolf-Rayet (WR) stars are evolved massive stars with strong fast stellar
winds. WR stars in our Galaxy have shown three possible sources of X-ray
emission associated with their winds: shocks in the winds, colliding stellar
winds, and wind-blown bubbles; however, quantitative analyses of observations
are often hampered by uncertainties in distances and heavy foreground
absorption. These problems are mitigated in the Magellanic Clouds (MCs), which
are at known distances and have small foreground and internal extinction. We
have therefore started a survey of X-ray emission associated with WR stars in
the MCs using archival Chandra, ROSAT, and XMM-Newton observations. In the
first paper of this series, we report the results for 70 WR stars in the MCs
using 192 archival Chandra ACIS observations. X-ray emission is detected from
29 WR stars. We have investigated their X-ray spectral properties,
luminosities, and temporal variability. These X-ray sources all have
luminosities greater than a few times 10^32 ergs s^-1, with spectra indicative
of highly absorbed emission from a thin plasma at high temperatures typical of
colliding winds in WR+OB binary systems. Significant X-ray variability with
periods ranging from a few hours up to ~20 days is seen associated with several
WR stars. In most of these cases, the X-ray variability can be linked to the
orbital motion of the WR star in a binary system, further supporting the
colliding wind scenario for the origin of the X-ray emission from these stars.
| [
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] | 2009-11-13T00:00:00 | [
[
"Guerrero",
"Martin A.",
""
],
[
"Chu",
"You-Hua",
""
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802.0504 | Vladimir Shiltsev | V.Shiltsev, Yu.Alexahin, K.Bishofberger, V.Kamerdzhiev, V.Parkhomchuk,
V.Reva, N.Solyak, D.Wildman, X.-L. Zhang, F.Zimmermann | Experimental Studies of Compensation of Beam-Beam Effects with Tevatron
Electron Lenses | submitted for publication in New Journal of Physics | New J.Phys.10:043042,2008 | 10.1088/1367-2630/10/4/043042 | null | physics.acc-ph | http://creativecommons.org/licenses/publicdomain/ | Applying the space-charge forces of a low-energy electron beam can lead to a
significant improvement of the beam-particle lifetime limit arising from the
beam-beam interaction in a high-energy collider [1]. In this article we present
the results of various beam experiments with electron lenses, novel instruments
developed for the beam-beam compensation at the Tevatron, which collides
980-GeV proton and antiproton beams. We study the dependencies of the particle
betatron tunes on the electron beam current, energy and position; we explore
the effects of electron-beam imperfections and noises; and we quantify the
improvements of the high-energy beam intensity and the collider luminosity
lifetime obtained by the action of the Tevatron Electron Lenses.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:08:44 GMT"
}
] | 2009-09-17T00:00:00 | [
[
"Shiltsev",
"V.",
""
],
[
"Alexahin",
"Yu.",
""
],
[
"Bishofberger",
"K.",
""
],
[
"Kamerdzhiev",
"V.",
""
],
[
"Parkhomchuk",
"V.",
""
],
[
"Reva",
"V.",
""
],
[
"Solyak",
"N.",
""
],
[
"Wildman",
"D.",
""
],
[
"Zhang",
"X. -L.",
""
],
[
"Zimmermann",
"F.",
""
]
] | [
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802.0505 | Jan Hamann | Jan Hamann, Julien Lesgourgues and Wessel Valkenburg | How to constrain inflationary parameter space with minimal priors | 16 pages, 3 figures | JCAP 0804:016,2008 | 10.1088/1475-7516/2008/04/016 | LAPTH-1236/08 | astro-ph gr-qc hep-ph | null | We update constraints on the Hubble function H(phi) during inflation, using
the most recent cosmic microwave background (CMB) and large scale structure
(LSS) data. Our main focus is on a comparison between various commonly used
methods of calculating the primordial power spectrum via analytical
approximations and the results obtained by integrating the exact equations
numerically. In each case, we impose naive, minimally restrictive priors on the
duration of inflation. We find that the choice of priors has an impact on the
results: the bounds on inflationary parameters can vary by up to a factor two.
Nevertheless, it should be noted that within the region allowed by the minimal
prior of the exact method, the accuracy of the approximations is sufficient for
current data. We caution however that a careless minimal implementation of the
approximative methods allows models for which the assumptions behind the
analytical approximations fail, and recommend using the exact numerical method
for a self-consistent analysis of cosmological data.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:40:59 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Hamann",
"Jan",
""
],
[
"Lesgourgues",
"Julien",
""
],
[
"Valkenburg",
"Wessel",
""
]
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] |
802.0506 | Hye-Sung Lee | Hye-Sung Lee | Lightest U-parity Particle (LUP) dark matter | Version to appear in PLB | Phys.Lett.B663:255-258,2008 | 10.1016/j.physletb.2008.03.065 | UFIFT-HEP-08-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest a U(1)' gauge symmetry as an alternative to the usual R-parity of
supersymmetric standard models, showing that it can also work as a common
source of stabilities of proton and dark matter in addition to other attractive
features. The residual discrete symmetries of a single U(1)' can provide
stabilities to both the MSSM sector (proton) and the hidden sector (new dark
matter candidate, LUP). The LUP can expand the viability of many models such as
R-parity violating models and gauge mediation models regarding dark matter
issue.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:10:06 GMT"
},
{
"version": "v2",
"created": "Fri, 2 May 2008 21:07:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lee",
"Hye-Sung",
""
]
] | [
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802.0507 | Ji-Feng Liu | Jifeng Liu (CfA) and Rosanne Di Stefano (CfA) | An Ultraluminous Supersoft X-ray Source in M81: An Intermediate-Mass
Black Hole? | 12 pages, 1 table, 3 figures | Astrophys.J.674:L73-L76,2008 | 10.1086/529071 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultraluminous supersoft X-ray sources (ULSSS) exhibit supersoft spectra with
blackbody temperatures of 50-100 eV and bolometric luminosities above $10^{39}$
erg s$^{-1}$, and are possibly intermediate mass black holes (IMBHs) of
$\ge10^3 M_\odot$ or massive white dwarfs that are progenitors of type Ia
supernovae. In this letter we report our optical studies of such a source in
M81, M81-ULS1, with HST archive observations. M81-ULS1 is identified with a
point-like object, the spectral energy distribution of which reveals a blue
component in addition to the companion of an AGB star. The blue component is
consistent with the power-law as expected from the geometrically-thin accretion
disk around an IMBH accretor, but inconsistent with the power-law as expected
from the X-ray irradiated flared accretion disk around a white dwarf accretor.
This result is strong evidence that M81-ULS1 is an IMBH instead of a white
dwarf.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:12:08 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Liu",
"Jifeng",
"",
"CfA"
],
[
"Di Stefano",
"Rosanne",
"",
"CfA"
]
] | [
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] |
802.0508 | Philip Hopkins | Philip F. Hopkins (1), Lars Hernquist (1), Thomas J. Cox (1), Suvendra
N. Dutta (1), Barry Rothberg (2) ((1) CfA, (2) NRL) | Dissipation and Extra Light in Galactic Nuclei: I. Gas-Rich Merger
Remnants | 36 pages, 38 figures, accepted for publication in ApJ (minor
revisions to match accepted version) | Astrophys.J.679:156-181,2008 | 10.1086/587544 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the origin and properties of 'extra' or 'excess' central light in
the surface brightness profiles of gas-rich merger remnants. Combining a large
set of hydrodynamical simulations with data on observed mergers (spanning a
broad range of profiles at various masses and degrees of relaxation), we show
how to robustly separate the physically meaningful extra light -- stellar
populations formed in a compact central starburst during a gas-rich merger --
from the outer profile established by violent relaxation acting on stars
already present in the progenitors prior to the final merger. This separation
is sensitive to the profile treatment, and we demonstrate that certain fitting
procedures can yield physically misleading results. We show that our method
reliably recovers the younger starburst population, and examine how the
properties of this component scale with mass, gas content, and other aspects of
the progenitors. We consider the time evolution of profiles in different bands,
and estimate biases introduced by observational studies at different times and
wavelengths. We show that extra light is ubiquitous in observed and simulated
gas-rich merger remnants, with sufficient mass (~3-30% of the stellar mass) to
explain the discrepancy in the maximum phase-space densities of ellipticals and
their progenitor spirals. The nature of this central component provides
powerful new constraints on the formation histories of observed systems.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:13:16 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 17:06:51 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Hopkins",
"Philip F.",
"",
"CfA"
],
[
"Hernquist",
"Lars",
"",
"CfA"
],
[
"Cox",
"Thomas J.",
"",
"CfA"
],
[
"Dutta",
"Suvendra N.",
"",
"CfA"
],
[
"Rothberg",
"Barry",
"",
"NRL"
]
] | [
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] |
802.0509 | Andrea Karis | James Robins | Causal Models for Estimating the Effects of Weight Gain on Mortality | 47 pages | null | null | null | stat.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Suppose, contrary to fact, in 1950, we had put the cohort of 18 year old
non-smoking American men on a stringent mandatory diet that guaranteed that no
one would ever weigh more than their baseline weight established at age 18. How
would the counter-factual mortality of these 18 year olds have compared to
their actual observed mortality through 2007? We describe in detail how this
counterfactual contrast could be estimated from longitudinal epidemiologic data
similiar to that stored in the electronic medical records of a large HMO by
applying g-estimation to a novel structural nested model. Our analytic approach
differs from any alternative approach in that in that, in the abscence of model
misspecification, it can successfully adjust for (i) measured time-varying
confounders such as exercise, hypertension and diabetes that are simultaneously
intermediate variables on the causal pathway from weight gain to death and
determinants of future weight gain, (ii) unmeasured confounding by undiagnosed
preclinical disease (i.e reverse causation) that can cause both poor weight
gain and premature mortality [provided an upper bound can be specified for the
maximum length of time a subject may suffer from a subclinical illness severe
enough to affect his weight without the illness becomes clinically manifest],
and (iii) the prescence of particular identifiable subgroups, such as those
suffering from serious renal, liver, pulmonary, and/or cardiac disease, in whom
confounding by unmeasured prognostic factors so severe as to render useless any
attempt at direct analytic adjustment.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:14:10 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Robins",
"James",
""
]
] | [
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] |
802.051 | Nicholas J. Kuhn | Nicholas J. Kuhn | A guide to telescopic functors | 30 pages | null | null | null | math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the mid 1980's, Pete Bousfield and I constructed certain p--local
`telescopic' functors Phi_n from spaces to spectra, for each prime p and each
positive integer n. These have striking properties that relate the chromatic
approach to homotopy theory to infinite loopspace theory: roughly put, the
spectrum Phi_n(Z) captures the v_n periodic homotopy of a space Z.
Recently there have been a variety of new uses of these functors, suggesting
that they have a central role to play in calculations of periodic phenomena.
Here I offer a guide to their construction, characterization, application, and
computation.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:16:41 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Kuhn",
"Nicholas J.",
""
]
] | [
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] |
802.0511 | Jan Zeman | Zahra Sharif-Khodaei and Jan Zeman | Microstructure-based modeling of elastic functionally graded materials:
One dimensional case | 33 pages, 14 figures | Journal of Mechanics of Materials and Structures, 3(9), 1773-1796,
2008 | 10.2140/jomms.2008.3.1773 | null | cond-mat.mtrl-sci cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Functionally graded materials (FGMs) are two-phase composites with
continuously changing microstructure adapted to performance requirements.
Traditionally, the overall behavior of FGMs has been determined using local
averaging techniques or a given smooth variation of material properties.
Although these models are computationally efficient, their validity and
accuracy remain questionable, since a link with the underlying microstructure
(including its randomness) is not clear. In this paper, we propose a modeling
strategy for the linear elastic analysis of FGMs systematically based on a
realistic microstructural model. The overall response of FGMs is addressed in
the framework of stochastic Hashin-Shtrikman variational principles. To allow
for the analysis of finite bodies, recently introduced discretization schemes
based on the Finite Element Method and the Boundary Element Method are employed
to obtain statistics of local fields. Representative numerical examples are
presented to compare the performance and accuracy of both schemes. To gain
insight into similarities and differences between these methods and to minimize
technicalities, the analysis is performed in the one-dimensional setting.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:35:50 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Aug 2008 12:05:56 GMT"
},
{
"version": "v3",
"created": "Mon, 27 Oct 2008 15:55:57 GMT"
}
] | 2011-08-31T00:00:00 | [
[
"Sharif-Khodaei",
"Zahra",
""
],
[
"Zeman",
"Jan",
""
]
] | [
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802.0512 | Maxime Wolff | Maxime Wolff | Connected components of the compactification of representation spaces of
surface groups | 75 pages, 11 figures | Geom. Topol. 15 (2011) 1225-1295 | 10.2140/gt.2011.15.1225 | null | math.GT math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Thurston compactification of Teichmuller spaces has been generalized to
many different representation spaces by J. Morgan, P. Shalen, M. Bestvina, F.
Paulin, A. Parreau and others. In the simplest case of representations of
fundamental groups of closed hyperbolic surfaces in PSL(2,R), we prove that
this compactification is very degenerated: the nice behaviour of the Thurston
compactification of the Teichmuller space contrasts with wild phenomena
happening on the boundary of the other connected components of these
representation spaces. We prove that it is more natural to consider a
refinement of this compactification, which remembers the orientation of the
hyperbolic plane. The ideal points of this compactification are fat R-trees,
i.e., R-trees equipped with a planar structure.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:22:04 GMT"
}
] | 2014-11-11T00:00:00 | [
[
"Wolff",
"Maxime",
""
]
] | [
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] |
802.0513 | Dougal Mackey | A.D. Mackey, M.I. Wilkinson, M.B. Davies, G.F. Gilmore | Black holes and core expansion in massive star clusters | Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2008.13052.x | null | astro-ph | null | We present the results from realistic N-body modelling of massive star
clusters in the Magellanic Clouds. We have computed eight simulations with N ~
10^5 particles; six of these were evolved for at least a Hubble time. The aim
of this modelling is to examine the possibility of large-scale core expansion
in massive star clusters and search for a viable dynamical origin for the
radius-age trend observed for such objects in the Magellanic Clouds. We
identify two physical processes which can lead to significant and prolonged
cluster core expansion: mass-loss due to rapid stellar evolution in a
primordially mass segregated cluster, and heating due to a retained population
of stellar-mass black holes. These two processes operate over different
time-scales - the former occurs only at early times and cannot drive core
expansion for longer than a few hundred Myr, while the latter typically does
not begin until several hundred Myr have passed but can result in core
expansion lasting for many Gyr. We investigate the behaviour of these expansion
mechanisms in clusters with varying degrees of primordial mass segregation and
in clusters with varying black hole retention fractions. In combination, the
two processes can lead to a wide variety of evolutionary paths on the
radius-age plane, which fully cover the observed cluster distribution and hence
define a dynamical origin for the radius-age trend in the Magellanic Clouds. We
discuss the implications of core expansion for various aspects of globular
cluster research, as well as the possibility of observationally inferring the
presence of a population of stellar-mass black holes in a cluster.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 09:53:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mackey",
"A. D.",
""
],
[
"Wilkinson",
"M. I.",
""
],
[
"Davies",
"M. B.",
""
],
[
"Gilmore",
"G. F.",
""
]
] | [
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] |
802.0514 | Guy F. de T\'eramond | Stanley J. Brodsky and Guy F. de Teramond | AdS/CFT and Light-Front QCD | 38 pages, 8 figures. Two lectures presented at the International
School of Subnuclear Physics, Searching for the `Totally Unexpected' in the
LHC Era, Erice, Sicily, August 29 - September 7, 2007 | null | null | SLAC-PUB-13107 | hep-ph hep-th | null | The AdS/CFT correspondence between string theory in AdS space and conformal
field theories in physical space-time leads to an analytic, semi-classical
model for strongly-coupled QCD which has scale invariance and dimensional
counting at short distances and color confinement at large distances. The
AdS/CFT correspondence also provides insights into the inherently
nonperturbative aspects of QCD such as the orbital and radial spectra of
hadrons and the form of hadronic wavefunctions. In particular, we show that
there is an exact correspondence between the fifth-dimensional coordinate of
AdS space $z$ and a specific impact variable $\zeta$ which measures the
separation of the quark and gluonic constituents within the hadron in ordinary
space-time. This connection leads to AdS/CFT predictions for the analytic form
of the frame-independent light-front wavefunctions (LFWFs) of mesons and
baryons, the fundamental entities which encode hadron properties. The LFWFs in
turn predict decay constants and spin correlations, as well as dynamical
quantities such as form factors, structure functions, generalized parton
distributions, and exclusive scattering amplitudes. Relativistic light-front
equations in ordinary space-time are found which reproduce the results obtained
using the fifth-dimensional theory and have remarkable algebraic structures and
integrability properties. As specific examples we describe the behavior of the
pion form factor in the space and time-like regions and determine the Dirac
nucleon form factors in the space-like region. An extension to nonzero quark
mass is used to determine hadronic distribution amplitudes of all mesons, heavy
and light. We compare our results with the moments of the distribution
amplitudes which have recently been computed from lattice gauge theory.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:53:30 GMT"
}
] | 2008-02-10T00:00:00 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"de Teramond",
"Guy F.",
""
]
] | [
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802.0515 | Alessandro Sozzetti | S. Casertano (1), M.G. Lattanzi (2), A. Sozzetti (2,3), A. Spagna (2),
S. Jancart (4), R. Morbidelli (2), R. Pannunzio (2), D. Pourbaix (4), D.
Queloz (5) ((1) STScI; (2) INAF-Osservatorio Astronomico di Torino; (3)
Harvard-Smithsonian CfA; (4) Universite' Libre de Bruxelles; (5) Geneva
Observatory) | Double-blind test program for astrometric planet detection with Gaia | 32 pages, 24 figures, 6 tables. Accepted for pubolication in A&A | null | 10.1051/0004-6361:20078997 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use detailed simulations of the Gaia observations of synthetic planetary
systems and develop and utilize independent software codes in double-blind mode
to analyze the data, including statistical tools for planet detection and
different algorithms for single and multiple Keplerian orbit fitting that use
no a priori knowledge of the true orbital parameters of the systems. 1) Planets
with astrometric signatures $\alpha\simeq 3$ times the single-measurement error
$\sigma_\psi$ and period $P\leq 5$ yr can be detected reliably, with a very
small number of false positives. 2) At twice the detection limit, uncertainties
in orbital parameters and masses are typically $15%-20%$. 3) Over 70% of
two-planet systems with well-separated periods in the range $0.2\leq P\leq 9$
yr, $2\leq\alpha/\sigma_\psi\leq 50$, and eccentricity $e\leq 0.6$ are
correctly identified. 4) Favorable orbital configurations have orbital elements
measured to better than 10% accuracy $> 90%$ of the time, and the value of the
mutual inclination angle determined with uncertainties $\leq 10^{\degr}$. 5)
Finally, uncertainties obtained from the fitting procedures are a good estimate
of the actual errors. Extrapolating from the present-day statistical properties
of the exoplanet sample, the results imply that a Gaia with $\sigma_\psi$ = 8
$\mu$as, in its unbiased and complete magnitude-limited census of planetary
systems, will measure several thousand giant planets out to 3-4 AUs from stars
within 200 pc, and will characterize hundreds of multiple-planet systems,
including meaningful coplanarity tests. Finally, we put Gaia into context,
identifying several areas of planetary-system science in which Gaia can be
expected to have a relevant impact, when combined with data coming from other
ongoing and future planet search programs.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:42:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Casertano",
"S.",
""
],
[
"Lattanzi",
"M. G.",
""
],
[
"Sozzetti",
"A.",
""
],
[
"Spagna",
"A.",
""
],
[
"Jancart",
"S.",
""
],
[
"Morbidelli",
"R.",
""
],
[
"Pannunzio",
"R.",
""
],
[
"Pourbaix",
"D.",
""
],
[
"Queloz",
"D.",
""
]
] | [
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] |
802.0516 | Mankei Tsang | Mankei Tsang (Massachusetts Institute of Technology) | Fundamental Quantum Limit to Multiphoton Absorption Rate for
Monochromatic Light | 4 pages, 1 figure, submitted, v2: accepted by PRL | Physical Review Letters 101, 033602 (2008) | 10.1103/PhysRevLett.101.033602 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The local multiphoton absorption rate for an arbitrary quantum state of
monochromatic light, taking into account the photon number, momentum, and
polarization degrees of freedom, is shown to have an upper bound that can be
reached by coherent fields. This surprising result rules out any quantum
enhancement of the multiphoton absorption rate by momentum entanglement.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:43:43 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jul 2008 04:12:46 GMT"
}
] | 2008-07-22T00:00:00 | [
[
"Tsang",
"Mankei",
"",
"Massachusetts Institute of Technology"
]
] | [
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] |
802.0517 | Eugene Eliseev | S.V. Kalinin, S. Jesse, B.J. Rodriguez, Y.H. Chu, R. Ramesh, E.A.
Eliseev, and A.N. Morozovska | Probing the role of single defects on the thermodynamics of
electric-field induced phase transitions | 34 pages,4 figures, high quality figures are available upon request,
submitted to Phys. Rev. Lett | null | 10.1103/PhysRevLett.100.155703 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The kinetics and thermodynamics of first order transitions is universally
controlled by defects that act as nucleation sites and pinning centers. Here we
demonstrate that defect-domain interactions during polarization reversal
processes in ferroelectric materials result in a pronounced fine structure in
electromechanical hysteresis loops. Spatially-resolved imaging of a single
defect center in multiferroic BiFeO3 thin film is achieved, and the defect size
and built-in field are determined self-consistently from the single-point
spectroscopic measurements and spatially-resolved images. This methodology is
universal and can be applied to other reversible bias-induced transitions
including electrochemical reactions.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:43:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kalinin",
"S. V.",
""
],
[
"Jesse",
"S.",
""
],
[
"Rodriguez",
"B. J.",
""
],
[
"Chu",
"Y. H.",
""
],
[
"Ramesh",
"R.",
""
],
[
"Eliseev",
"E. A.",
""
],
[
"Morozovska",
"A. N.",
""
]
] | [
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] |
802.0518 | William Henney | Ma. T. Garc\'ia-D\'iaz (1), W. J. Henney (2), J. A. L\'opez (1), and
T. Doi (3). (1. Instituto de Astronom\'ia, Universidad Nacional Aut\'onoma de
M\'exico, Ensenada; 2. Centro de Radioastronom\'ia y Astrof\'isica,
Universidad Nacional Aut\'onoma de M\'exico, Morelia; 3. Japan Aerospace
Exploration Agency, Tokyo, Japan) | Velocity Structure in the Orion Nebula. II. Emission Line Atlas of
Partially Ionized to Fully Ionized Gas | 34 pages, 22 figures, RevMexAA in press. High resolution figures and
data available from http://www.astrosmo.unam.mx/~w.henney/orionatlas | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an atlas of three-dimensional (position-position-velocity) spectra
of the Orion Nebula in optical emission lines from a variety of different
ionization stages: [O I] 6300, [S II] 6716,6731, [N II] 6584, [S III] 6312, H
alpha 6563, and [O III] 5007. These transitions provide point to point
information about the physical structure and kinematics of the nebula at an
effective resolution of 3'' x 2'' x 10 km/s, clearly showing the large scale
behavior of the ionized gas and the presence of localized phenomena such as
Herbig-Haro outflows. As an example application of the atlas, we present a
statistical analysis of the widths of the H alpha, [O III], and [N II] lines
that permits a determination of the mean electron temperature in the nebula of
(9200 +/- 400) K. We also find, in contradiction to previous claims, that the
non-thermal line broadening is not significantly different between
recombination lines and collisional lines.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:31:42 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"García-Díaz",
"Ma. T.",
"",
"1. Instituto de Astronomía, Universidad Nacional Autónoma de\n México, Ensenada; 2. Centro de Radioastronomía y Astrofísica,\n Universidad Nacional Autónoma de México, Morelia; 3. Japan Aerospace\n Exploration Agency, Tokyo, Japan"
],
[
"Henney",
"W. J.",
"",
"1. Instituto de Astronomía, Universidad Nacional Autónoma de\n México, Ensenada; 2. Centro de Radioastronomía y Astrofísica,\n Universidad Nacional Autónoma de México, Morelia; 3. Japan Aerospace\n Exploration Agency, Tokyo, Japan"
],
[
"López",
"J. A.",
"",
"1. Instituto de Astronomía, Universidad Nacional Autónoma de\n México, Ensenada; 2. Centro de Radioastronomía y Astrofísica,\n Universidad Nacional Autónoma de México, Morelia; 3. Japan Aerospace\n Exploration Agency, Tokyo, Japan"
],
[
"Doi",
"T.",
"",
"1. Instituto de Astronomía, Universidad Nacional Autónoma de\n México, Ensenada; 2. Centro de Radioastronomía y Astrofísica,\n Universidad Nacional Autónoma de México, Morelia; 3. Japan Aerospace\n Exploration Agency, Tokyo, Japan"
],
[
".",
"",
"",
"1. Instituto de Astronomía, Universidad Nacional Autónoma de\n México, Ensenada; 2. Centro de Radioastronomía y Astrofísica,\n Universidad Nacional Autónoma de México, Morelia; 3. Japan Aerospace\n Exploration Agency, Tokyo, Japan"
]
] | [
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] |
802.0519 | Niels Obers | Niels A. Obers | Black Holes in Higher-Dimensional Gravity | latex, 49 pages, 5 figures. Lectures to appear in the proceedings of
the Fourth Aegean Summer School, Mytiline, Lesvos, Greece, September 17-22,
2007 | Lect.Notes Phys.769:211-258,2009 | 10.1007/978-3-540-88460-6_6 | null | hep-th | null | These lectures review some of the recent progress in uncovering the phase
structure of black hole solutions in higher-dimensional vacuum Einstein
gravity. The two classes on which we focus are Kaluza-Klein black holes, i.e.
static solutions with an event horizon in asymptotically flat spaces with
compact directions, and stationary solutions with an event horizon in
asymptotically flat space. Highlights include the recently constructed
multi-black hole configurations on the cylinder and thin rotating black rings
in dimensions higher than five. The phase diagram that is emerging for each of
the two classes will be discussed, including an intriguing connection that
relates the phase structure of Kaluza-Klein black holes with that of
asymptotically flat rotating black holes.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 23:15:27 GMT"
}
] | 2009-01-28T00:00:00 | [
[
"Obers",
"Niels A.",
""
]
] | [
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] |
802.052 | Julien Barral | Julien Barral and Mounir Mensi | Multifractal analysis of Birkhoff averages on "self-affine" symbolic
spaces | null | null | 10.1088/0951-7715/21/10/011 | null | math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We achieve on self-affine Sierpinski carpets the multifractal analysis of the
Birkhoff averages of potentials satisfying a Dini condition. Given such a
potential, the corresponding Hausdorff spectrum cannot be deduced from that of
the associated Gibbs measure by a simple transformation. Indeed, these spectra
are respectively obtained as the Legendre transform of two distinct concave
differentiable functions that cannot be deduced from one another by a dilation
and a translation. This situation is in contrast with what is observed in the
familiar self-similar case. Our results are presented in the framework of
almost-multiplicative functions on products of two distinct symbolic spaces and
their projection on the associated self-affine carpets.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 21:56:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Barral",
"Julien",
""
],
[
"Mensi",
"Mounir",
""
]
] | [
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] |
802.0521 | Sean Carroll | Sean M. Carroll and Heywood Tam | Aether Compactification | null | Phys.Rev.D78:044047,2008 | 10.1103/PhysRevD.78.044047 | CALT-68-2670 | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new way to hide extra dimensions without invoking branes, based
on Lorentz-violating tensor fields with expectation values along the extra
directions. We investigate the case of a single vector ``aether'' field on a
compact circle. In such a background, interactions of other fields with the
aether can lead to modified dispersion relations, increasing the mass of the
Kaluza-Klein excitations. The mass scale characterizing each Kaluza-Klein tower
can be chosen independently for each species of scalar, fermion, or gauge
boson. No small-scale deviations from the inverse square law for gravity are
predicted, although light graviton modes may exist.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 00:04:10 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 22:18:18 GMT"
},
{
"version": "v3",
"created": "Tue, 24 Jun 2008 22:10:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Carroll",
"Sean M.",
""
],
[
"Tam",
"Heywood",
""
]
] | [
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] |
802.0522 | Jeremy England | Jeremy L. England and Vijay S. Pande | Potential for modulation of the hydrophobic effect inside chaperonins | null | null | 10.1529/biophysj.108.131037 | null | q-bio.BM | null | Despite the spontaneity of some in vitro protein folding reactions, native
folding in vivo often requires the participation of barrel-shaped multimeric
complexes known as chaperonins. Although it has long been known that chaperonin
substrates fold upon sequestration inside the chaperonin barrel, the precise
mechanism by which confinement within this space facilitates folding remains
unknown. In this study, we examine the possibility that the chaperonin mediates
a favorable reorganization of the solvent for the folding reaction. We begin by
discussing the effect of electrostatic charge on solvent-mediated hydrophobic
forces in an aqueous environment. Based on these initial physical arguments, we
construct a simple, phenomenological theory for the thermodynamics of density
and hydrogen bond order fluctuations in liquid water. Within the framework of
this model, we investigate the effect of confinement within a chaperonin-like
cavity on the configurational free energy of water by calculating solvent free
energies for cavities corresponding to the different conformational states in
the ATP- driven catalytic cycle of the prokaryotic chaperonin GroEL. Our
findings suggest that one function of chaperonins may be to trap unfolded
proteins and subsequently expose them to a micro-environment in which the
hydrophobic effect, a crucial thermodynamic driving force for folding, is
enhanced.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 00:10:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"England",
"Jeremy L.",
""
],
[
"Pande",
"Vijay S.",
""
]
] | [
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] |
802.0523 | Christopher Withers | Christopher S. Withers and Saralees Nadarajah | The distribution of the maximum of a first order moving average: the
continuous case | 15 A4 pages. Version 4 corrects (3.8). Version 3 expands Section 2.
Version 2 corrected recurrence relation (2.5) | null | null | null | stat.ME math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give the distribution of $M_n$, the maximum of a sequence of $n$
observations from a moving average of order 1. Solutions are first given in
terms of repeated integrals and then for the case where the underlying
independent random variables have an absolutely continuous density. When the
correlation is positive, $$ P(M_n %\max^n_{i=1} X_i \leq x) =\
\sum_{j=1}^\infty \beta_{jx} \nu_{jx}^{n} \approx B_{x} \nu_{1x}^{n} $$ where
%$\{X_i\}$ is a moving average of order 1 with positive correlation, and
$\{\nu_{jx}\}$ are the eigenvalues (singular values) of a Fredholm kernel and
$\nu_{1x}$ is the eigenvalue of maximum magnitude. A similar result is given
when the correlation is negative. The result is analogous to large deviations
expansions for estimates, since the maximum need not be standardized to have a
limit. % there are more terms, and $$P(M_n <x) \approx B'_{x}\
(1+\nu_{1x})^n.$$
For the continuous case the integral equations for the left and right
eigenfunctions are converted to first order linear differential equations. The
eigenvalues satisfy an equation of the form $$\sum_{i=1}^\infty
w_i(\lambda-\theta_i)^{-1}=\lambda-\theta_0$$ for certain known weights
$\{w_i\}$ and eigenvalues $\{\theta_i\}$ of a given matrix. This can be solved
by truncating the sum to an increasing number of terms.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 22:13:18 GMT"
},
{
"version": "v2",
"created": "Fri, 23 Jan 2009 00:21:33 GMT"
},
{
"version": "v3",
"created": "Tue, 3 Feb 2009 00:25:57 GMT"
},
{
"version": "v4",
"created": "Tue, 1 Sep 2009 03:43:04 GMT"
},
{
"version": "v5",
"created": "Mon, 7 Sep 2009 02:28:36 GMT"
}
] | 2009-09-07T00:00:00 | [
[
"Withers",
"Christopher S.",
""
],
[
"Nadarajah",
"Saralees",
""
]
] | [
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] |
802.0524 | Yuji Kodama | Sarbarish Chakravarty and Yuji Kodama | A generating function for the N-soliton solutions of the
Kadomtsev-Petviashvili II equation | 18 pages, 4 figures. Added some minor comments. To appear in AMS
Contemporary Mathematics | null | null | null | nlin.SI math-ph math.CO math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work describes a classification of the $N$-soliton solutions of the
Kadomtsev-Petviashvili II equation in terms of chord diagrams of N chords
joining pairs of 2N points. The different classes of N-solitons are enumerated
by the distribution of crossings of the chords. The generating function of the
chord diagrams is expressed as a continued fraction, special cases of which are
moment generating functions for certain kinds of $q$-orthogonal polynomials.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 22:20:54 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 21:30:07 GMT"
}
] | 2008-05-06T00:00:00 | [
[
"Chakravarty",
"Sarbarish",
""
],
[
"Kodama",
"Yuji",
""
]
] | [
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] |
802.0525 | Masahide Yamaguchi | Kenji Kadota, Teruhiko Kawano, Masahide Yamaguchi | New D-term chaotic inflation in supergravity and leptogenesis | 14 pages, no figure, to appear in Phys. Rev. D | Phys.Rev.D77:123516,2008 | 10.1103/PhysRevD.77.123516 | FTPI-MINN-08-05, UMN-TH-2536/08, UT-08-02 | hep-ph astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new model of D-term dominated chaotic inflation in supergravity.
The F-flat direction present in this model is lifted by the dominant D-term,
which leads to chaotic inflation and subsequent reheating. No cosmic string is
formed after inflation because the U(1) gauge symmetry is broken during
inflation. The leptogenesis scenario via the inflaton decay in our D-term
chaotic inflation scenario is also discussed.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 22:29:10 GMT"
},
{
"version": "v2",
"created": "Fri, 23 May 2008 21:30:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kadota",
"Kenji",
""
],
[
"Kawano",
"Teruhiko",
""
],
[
"Yamaguchi",
"Masahide",
""
]
] | [
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802.0526 | Andres Santos | F. Vega Reyes, V. Garzo, A. Santos | Impurity in a granular gas under nonlinear Couette flow | 23 pages, 11 figures; v2: Preliminary DSMC results from the Boltzmann
equation included, Fig. 11 is new | J. Stat. Mech., P09003 (2008) | 10.1088/1742-5468/2008/09/P09003 | null | cond-mat.soft cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study in this work the transport properties of an impurity immersed in a
granular gas under stationary nonlinear Couette flow. The starting point is a
kinetic model for low-density granular mixtures recently proposed by the
authors [Vega Reyes F et al. 2007 Phys. Rev. E 75 061306]. Two routes have been
considered. First, a hydrodynamic or normal solution is found by exploiting a
formal mapping between the kinetic equations for the gas particles and for the
impurity. We show that the transport properties of the impurity are
characterized by the ratio between the temperatures of the impurity and gas
particles and by five generalized transport coefficients: three related to the
momentum flux (a nonlinear shear viscosity and two normal stress differences)
and two related to the heat flux (a nonlinear thermal conductivity and a cross
coefficient measuring a component of the heat flux orthogonal to the thermal
gradient). Second, by means of a Monte Carlo simulation method we numerically
solve the kinetic equations and show that our hydrodynamic solution is valid in
the bulk of the fluid when realistic boundary conditions are used. Furthermore,
the hydrodynamic solution applies to arbitrarily (inside the continuum regime)
large values of the shear rate, of the inelasticity, and of the rest of
parameters of the system. Preliminary simulation results of the true Boltzmann
description show the reliability of the nonlinear hydrodynamic solution of the
kinetic model. This shows again the validity of a hydrodynamic description for
granular flows, even under extreme conditions, beyond the Navier-Stokes domain.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 22:35:10 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Sep 2008 14:48:23 GMT"
}
] | 2008-09-05T00:00:00 | [
[
"Reyes",
"F. Vega",
""
],
[
"Garzo",
"V.",
""
],
[
"Santos",
"A.",
""
]
] | [
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] |
802.0527 | Matthew Dixon | Matthew Dixon and Todd Ringler | Conservative Properties of the Variational Free-Lagrange Method for
Shallow Water | A 27 page extended version (with 10 figures) of a two-page article
submitted to the ICIAM 07 proceedings | null | null | LA-UR 07-7482 | math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The variational free-Lagrange (VFL) method for shallow water is a
free-Lagrange method with the additional property that it preserves the
variational structure of shallow water. The VFL method was first derived in
this context by \cite{AUG84} who discretized Hamilton's action principle with a
free-Lagrange data structure. The purpose of this article is to assess the
long-time conservation properties of the VFL method for regularized shallow
water which are useful for climate simulation. Long-time regularized shallow
water simulations show that the VFL method exhibits no secular drift in the (i)
energy error through the application of symplectic integrators; and (ii) the
potential vorticity error through the construction of discrete curl, divergence
and gradient operators which satisfy semi-discrete divergence and potential
vorticity conservation laws. These diagnostic semi-discrete equations augment
the description of the VFL method by characterizing the evolution of its
respective irrotational and solenoidal components in the Lagrangian frame. Like
the continuum equations, the former exhibits a $\text{div}^2\mathbf{U}$ term
which indicates that the flow has a very strong tendency towards a purely
rotational state.
Numerical results show (i) the preservation of shape and strength of an
initially radially symmetric vortex pair in purely rotational regularized
shallow water and (ii) how the Voronoi diagram retains the history of the flow
field and (iii) that energy is conserved to $\mathcal{O}(\Delta^2)$ and
potential vorticity error to within 5% with no secular growth over a 50 year
period.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 20:39:06 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jan 2010 03:37:13 GMT"
}
] | 2010-01-28T00:00:00 | [
[
"Dixon",
"Matthew",
""
],
[
"Ringler",
"Todd",
""
]
] | [
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802.0528 | Tom Mestdag | M. Crampin and T. Mestdag | Routh's procedure for non-Abelian symmetry groups | 30 pages, to appear in J Math Phys | J Math Phys (2008) 49, 032901. | 10.1063/1.2885077 | null | math.DG math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend Routh's reduction procedure to an arbitrary Lagrangian system (that
is, one whose Lagrangian is not necessarily the difference of kinetic and
potential energies) with a symmetry group which is not necessarily Abelian. To
do so we analyse the restriction of the Euler-Lagrange field to a level set of
momentum in velocity phase space. We present a new method of analysis based on
the use of quasi-velocities. We discuss the reconstruction of solutions of the
full Euler-Lagrange equations from those of the reduced equations.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 14:53:24 GMT"
}
] | 2008-03-11T00:00:00 | [
[
"Crampin",
"M.",
""
],
[
"Mestdag",
"T.",
""
]
] | [
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] |
802.0529 | Christopher Withers | Christopher S. Withers and Saralees Nadarajah | The distribution of the maximum of a first order moving average: the
discrete case | 13 pages. This version gives full solutions to the examples | null | null | null | stat.ME math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give the distribution of $M_n$, the maximum of a sequence of $n$
observations from a moving average of order 1. Solutions are first given in
terms of repeated integrals and then for the case where the underlying
independent random variables are discrete. When the correlation is positive, $$
P(M_n \max^n_{i=1} X_i \leq x) = \sum_{j=1}^\infty \beta_{jx} \nu_{jx}^{n}
\approx B_{x} r{1x}^{n} $$ where $\{\nu_{jx}\}$ are the eigenvalues of a
certain matrix, $r_{1x}$ is the maximum magnitude of the eigenvalues, and $I$
depends on the number of possible values of the underlying random variables.
The eigenvalues do not depend on $x$ only on its range.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 22:47:43 GMT"
},
{
"version": "v2",
"created": "Mon, 9 Mar 2009 00:30:01 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Apr 2009 04:18:07 GMT"
}
] | 2009-04-06T00:00:00 | [
[
"Withers",
"Christopher S.",
""
],
[
"Nadarajah",
"Saralees",
""
]
] | [
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802.053 | Jose' P. S. Lemos | Jos\'e P. S. Lemos, Vilson T. Zanchin | Bonnor stars in d spacetime dimensions | 48 pages, 5 figues, references added, minor changes | Phys.Rev.D77:064003,2008 | 10.1103/PhysRevD.77.064003 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bonnor stars are regular static compact configurations in equilibrium,
composed of an extremal dust fluid, a charged dust fluid where the mass density
is equal to the charge density, joined to an exterior vacuum solution, within
Newtonian gravity and general relativity. In four dimensions, they obey the
corresponding Majumdar-Papapetrou system, where the gravitational potential is
a simple function of the electric potential field and the fluid, when there is
one, is made of extremal dust. The Majumdar-Papapetrou system can be
generalized to d spacetime dimensions. Thus, it is natural to study Bonnor
solutions in higher d dimensions. We analyze Newton-Coulomb theory with an
electrically charged fluid in a Majumdar-Papapetrou context, in d=n+1 spacetime
dimensions, n the number of spatial dimensions. Within the Newtonian theory, in
vacuum, the Majumdar-Papapetrou relation for the gravitational potential in
terms of the electric potential, and its related Weyl relation, are equivalent,
in contrast with general relativity. We study a class of spherically symmetric
Bonnor stars. Under sufficient compactification they form point mass charged
Newtonian singularities. We study the analogue systems in the Einstein-Maxwell
theory with an electrically charged fluid. We restate some properties of this
system and obtain spherically symmetric Bonnor star solutions in d=n+1
spacetime dimensions. These stars, under compactification, form quasi-black
holes. Whereas there are no solutions for Newtonian or relativistic stars
supported by degenerate pressure in higher dimensions, higher dimensional
Bonnor stars, supported by electric repulsion, do indeed have solutions within
Newtonian gravity and general relativity. So the existence of stars depends on
the number of dimensions and on the underlying field content.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 23:02:01 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jun 2008 17:18:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lemos",
"José P. S.",
""
],
[
"Zanchin",
"Vilson T.",
""
]
] | [
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802.0531 | Tim Bedding | Timothy R. Bedding and Hans Kjeldsen | Observing solar-like oscillations | Proc. of a conference on "Unsolved Problems in Stellar Physics", A
Conference in Honour of Douglas Gough. AIP Conference Proceedings, Volume
948, pp. 117-124 (2007) | null | 10.1063/1.2818959 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The past few years have seen great progress in observing oscillations in
solar-type stars, lying on or just above the main sequence. We review the most
recent results, most of which were obtained using high-precision velocity
measurements. We also briefly discuss observations of more evolved stars,
namely G, K and M giants and supergiants.
| [
{
"version": "v1",
"created": "Mon, 4 Feb 2008 23:19:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bedding",
"Timothy R.",
""
],
[
"Kjeldsen",
"Hans",
""
]
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802.0532 | Misha Feigin | Misha V. Feigin | Trigonometric Solutions of WDVV Equations and Generalized
Calogero-Moser-Sutherland Systems | null | SIGMA 5 (2009), 088, 10 pages | 10.3842/SIGMA.2009.088 | null | math-ph math.MP nlin.SI | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We consider trigonometric solutions of WDVV equations and derive geometric
conditions when a collection of vectors with multiplicities determines such a
solution. We incorporate these conditions into the notion of trigonometric
Veselov system ($\vee$-system) and we determine all trigonometric
$\vee$-systems with up to five vectors. We show that generalized
Calogero-Moser-Sutherland operator admits a factorized eigenfunction if and
only if it corresponds to the trigonometric $\vee$-system; this inverts a
one-way implication observed by Veselov for the rational solutions.
| [
{
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"created": "Mon, 4 Feb 2008 23:23:33 GMT"
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{
"version": "v2",
"created": "Mon, 18 May 2009 18:55:52 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Sep 2009 04:57:49 GMT"
}
] | 2009-09-17T00:00:00 | [
[
"Feigin",
"Misha V.",
""
]
] | [
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802.0533 | Semen Kutateladze S | S.S. Kutateladze | Sobolev and Schwartz: Two Fates and Two Fames | 12 pages; a few more typos corrected | J. Appl. Indust. Math., 2008, V.2, No.3, 301-310 | null | null | math.HO math.FA | null | This is a brief overview of the lives and contributions of S.L. Sobolev and
L. Schwartz, the cofounders of distribution theory.
| [
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"created": "Tue, 5 Feb 2008 11:16:39 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 11:09:23 GMT"
},
{
"version": "v3",
"created": "Tue, 12 Feb 2008 10:31:11 GMT"
},
{
"version": "v4",
"created": "Wed, 13 Feb 2008 12:33:03 GMT"
}
] | 2011-05-31T00:00:00 | [
[
"Kutateladze",
"S. S.",
""
]
] | [
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802.0534 | Syed Jafar | Viveck R. Cadambe, Syed A. Jafar | Capacity of Wireless Networks within o(log(SNR)) - the Impact of Relays,
Feedback, Cooperation and Full-Duplex Operation | null | IEEE Transactions on Information Theory, Vol. 55, No. 5, May 2009,
Pages: 2334-2344 | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent work has characterized the sum capacity of
time-varying/frequency-selective wireless interference networks and $X$
networks within $o(\log({SNR}))$, i.e., with an accuracy approaching 100% at
high SNR (signal to noise power ratio). In this paper, we seek similar capacity
characterizations for wireless networks with relays, feedback, full duplex
operation, and transmitter/receiver cooperation through noisy channels. First,
we consider a network with $S$ source nodes, $R$ relay nodes and $D$
destination nodes with random time-varying/frequency-selective channel
coefficients and global channel knowledge at all nodes. We allow full-duplex
operation at all nodes, as well as causal noise-free feedback of all received
signals to all source and relay nodes. The sum capacity of this network is
characterized as $\frac{SD}{S+D-1}\log({SNR})+o(\log({SNR}))$. The implication
of the result is that the capacity benefits of relays, causal feedback,
transmitter/receiver cooperation through physical channels and full duplex
operation become a negligible fraction of the network capacity at high SNR.
Some exceptions to this result are also pointed out in the paper. Second, we
consider a network with $K$ full duplex nodes with an independent message from
every node to every other node in the network. We find that the sum capacity of
this network is bounded below by $\frac{K(K-1)}{2K-2}+o(\log({SNR}))$ and
bounded above by $\frac{K(K-1)}{2K-3}+o(\log({SNR}))$.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 00:21:05 GMT"
}
] | 2012-04-03T00:00:00 | [
[
"Cadambe",
"Viveck R.",
""
],
[
"Jafar",
"Syed A.",
""
]
] | [
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802.0535 | Bernd Berg | Bernd A. Berg and Santosh Dubey | Finite Volume Kolmogorov-Johnson-Mehl-Avrami Theory | 4 pages, 4 figures. Additions after referee reports: Scaling of the
variable q is proven. Additional references are added | Phys.Rev.Lett.100:165702,2008 | 10.1103/PhysRevLett.100.165702 | null | cond-mat.stat-mech cond-mat.mtrl-sci hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Kolmogorov-Johnson-Mehl-Avrami (KJMA) theory of phase conversion in
finite volumes. For the conversion time we find the relationship $\tau_{\rm
con} = \tau_{\rm nu} [1+f_d(q)]$. Here $d$ is the space dimension, $\tau_{\rm
nu}$ the nucleation time in the volume $V$, and $f_d(q)$ a scaling function.
Its dimensionless argument is $q=\tau_{\rm ex}/ \tau_{\rm nu}$, where
$\tau_{\rm ex}$ is an expansion time, defined to be proportional to the
diameter of the volume divided by expansion speed. We calculate $f_d(q)$ in
one, two and three dimensions. The often considered limits of phase conversion
via either nucleation or spinodal decomposition are found to be volume-size
dependent concepts, governed by simple power laws for $f_d(q)$.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 00:24:32 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Apr 2008 00:34:08 GMT"
}
] | 2011-05-09T00:00:00 | [
[
"Berg",
"Bernd A.",
""
],
[
"Dubey",
"Santosh",
""
]
] | [
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] |
802.0536 | Chunlin Wang | Chunlin Wang | On the Asymptotic Normality of the Conditional Maximum Likelihood
Estimators for the Truncated Regression Model and the Tobit Model | null | null | null | null | math.ST math.PR stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the asymptotic normality of the conditional maximum
likelihood (ML) estimators for the truncated regression model and the Tobit
model. We show that under the general setting assumed in his book, the
conjectures made by Hayashi (2000) \footnote{see page 516, and page 520 of
Hayashi (2000).} about the asymptotic normality of the conditional ML
estimators for both models are true, namely, a sufficient condition is the
nonsingularity of $\mathbf{x_tx'_t}$.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 00:31:50 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Wang",
"Chunlin",
""
]
] | [
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] |
802.0537 | Yanxia Zhang | Gao Dan, Zhang Yanxia, Zhao Yongheng | Support Vector Machines and Kd-tree for Separating Quasars from Large
Survey Databases | 11 pages, 4 figures, 8 tables. accepted for publication in MNRAS | null | null | null | astro-ph | null | We compare the performance of two automated classification algorithms:
k-dimensional tree (kd-tree) and support vector machines (SVMs), to separate
quasars from stars in the databases of the Sloan Digital Sky Survey (SDSS) and
the Two Micron All Sky Survey (2MASS) catalogs. The two algorithms are trained
on subsets of SDSS and 2MASS objects whose nature is known via spectroscopy. We
choose different attribute combination as input patterns to train the
classifier using photometric data only and present the classification results
obtained by these two methods. Performance metrics such as precision and
recall, true positive rate and true negative rate, F-measure, G-mean and
Weighted Accuracy are computed to evaluate the performance of the two
algorithms. The study shows that both kd-tree and SVMs are effective automated
algorithms to classify point sources. SVMs show slightly higher accuracy, but
kd-tree requires less computation time. Given different input patterns based on
various parameters(e.g. magnitudes, color information), we conclude that both
kd-tree and SVMs show better performance with fewer features. What is more, our
results also indicate that the accuracy using the four colors (u-g, g-r, r-i,
i-z) and r magnitude based on SDSS model magnitudes adds up to the highest
value. The classifiers trained by kd-tree and SVMs can be used to solve the
automated classification problems faced by the virtual observatory (VO);
moreover, they all can be applied for the photometric preselection of quasar
candidates for large survey projects in order to optimize the efficiency of
telescopes.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 03:41:52 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Dan",
"Gao",
""
],
[
"Yanxia",
"Zhang",
""
],
[
"Yongheng",
"Zhao",
""
]
] | [
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] |
802.0538 | Vicky Safouris | V. Safouris, R. Subrahmanyan, G. Bicknell, L. Saripalli | PKS B1545-321: Bow shocks of a relativistic jet? | 26 pages including 1 table and 16 figures. To appear in MNRAS | null | 10.1111/j.1365-2966.2008.12975.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sensitive, high resolution images of the double-double radio galaxy PKS
B1545-321 reveal detailed structure, which we interpret in the light of
previous work on the interaction of restarted jets with pre-existing relict
cocoons. We have also examined the spectral and polarization properties of the
source, the color distribution in the optical host and the environment of this
galaxy in order to understand its physical evolution. We propose that the
restarted jets generate narrow bow shocks and that the inner lobes are a
mixture of cocoon plasma reaccelerated at the bow shock and new jet material
reaccelerated at the termination shock. The dynamics of the restarted jets
implies that their hot spots advance at mildly relativistic speeds with
external Mach numbers of at least 5. The existence of supersonic hot spot Mach
numbers and bright inner lobes is the result of entrainment causing a reduction
in the sound speed of the pre-existing cocoon. The interruption to jet activity
in PKS B1545-321 has been brief - lasting less than a few percent of the
lifetime $\sim (0.3-2)\times 10^{8} yr$ of the giant radio source. The host
galaxy is located at the boundary of a large scale filamentary structure, and
shows blue patches in color distribution indicative of a recent merger, which
may have triggered the Mpc-scale radio galaxy.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 00:53:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Safouris",
"V.",
""
],
[
"Subrahmanyan",
"R.",
""
],
[
"Bicknell",
"G.",
""
],
[
"Saripalli",
"L.",
""
]
] | [
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] |
802.0539 | Alexander Gavrilenko | A. V. Gavrilenko, T. D. Matos, C. E. Bonner, S.-S. Sun, C. Zhang, V.
I. Gavrilenko | Optical Absorption of Poly(thiophene vinylene) Conjugated Polymers.
Experiment and First Principle Theory | 6 pages, 6 figures, submitted to Journal of Physical Chemistry B,
2008 | null | null | null | physics.chem-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Optical absorption spectra of poly(thiophene vinylene) (PTV) conjugated
polymers have been studied at room temperature in the spectral range of 450 to
800 nm. A dominant peak located at 577 nm and a prominent shoulder at 619 nm
are observed. Another shoulder located at 685 nm is observed at high
concentration and after additional treatment (heat, sonification) only.
Equilibrium atomic geometries and optical absorption of PTV conjugated polymers
have also been studied by first principles density functional theory (DFT). For
PTV in solvent, the theoretical calculations predict two equilibrium geometries
with different interchain distances. By comparative analysis of the
experimental and theoretical data, it is demonstrated that the new measured
long-wavelength optical absorption shoulder is consistent with new optical
absorption peak predicted for most energetically favorable PTV phase in the
solvent. This shoulder is interpreted as a direct indication of increased
interchain interaction in the solvent which has caused additional electronic
energy structure transformations.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 01:13:37 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Gavrilenko",
"A. V.",
""
],
[
"Matos",
"T. D.",
""
],
[
"Bonner",
"C. E.",
""
],
[
"Sun",
"S. -S.",
""
],
[
"Zhang",
"C.",
""
],
[
"Gavrilenko",
"V. I.",
""
]
] | [
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] |
802.054 | Krisztina Eva Gabanyi | K. E. Gabanyi, T. P. Krichbaum, A. Kraus, A. Witzel, J.A. Zensus | VSOP Observations of the Blazar S5 2007+77 | 4 pages, submitted to the proceedings of the symposium "Approaching
Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technology"
(ISAS/JAXA, Sagamihara, Japan, 3-7 Dec 2007). Astronomical Society of the
Pacific Conference Series, eds. Hagiwara Y., Fomalont E.B., Tsuboi M., Murata
Y | Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics
and Technologies ASP Conf Series, Vol. 402, 2009 | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The blazar, S5 2007+77 shows intraday variability in cm wavelengths. Seven
epochs of VSOP observations were carried out in 1998 and 1999 at 5 GHz to look
for the origin of the variability with the highest achievable angular
resolution at cm wavelengths. Here the results of four epochs are analysed,
which revealed ~10% variations in polarized flux density.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 01:26:07 GMT"
}
] | 2013-09-26T00:00:00 | [
[
"Gabanyi",
"K. E.",
""
],
[
"Krichbaum",
"T. P.",
""
],
[
"Kraus",
"A.",
""
],
[
"Witzel",
"A.",
""
],
[
"Zensus",
"J. A.",
""
]
] | [
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] |
802.0541 | E. W. Thommes | E. W. Thommes, M. Nagasawa and D. N. C. Lin | Dynamical Shakeup of Planetary Systems II. N-body simulations of Solar
System terrestrial planet formation induced by secular resonance sweeping | To appear in ApJ | Astrophys.J. 676:728-739,2008 | 10.1086/526408 | null | astro-ph | null | We revisit the "dynamical shakeup" model of Solar System terrestrial planet
formation, wherein the whole process is driven by the sweeping of Jupiter's
secular resonance as the gas disk is removed. Using a large number of 0.5
Gyr-long N-body simulations, we investigate the different outcomes produced by
such a scenario. We confirm that in contrast to existing models, secular
resonance sweeping combined with tidal damping by the disk gas can reproduce
the low eccentricities and inclinations, and high radial mass concentration, of
the Solar System terrestrial planets. At the same time, this also drives the
final assemblage of the planets on a timescale of several tens of millions of
years, an order of magnitude faster than inferred from previous numerical
simulations which neglected these effects, but possibly in better agreement
with timescales inferred from cosmochemical data. In addition, we find that
significant delivery of water-rich material from the outer Asteroid Belt is a
natural byproduct.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 03:32:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Thommes",
"E. W.",
""
],
[
"Nagasawa",
"M.",
""
],
[
"Lin",
"D. N. C.",
""
]
] | [
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] |
802.0542 | Young-Jai Park | Yong-Wan Kim and Young-Jai Park | Entropy of (1+1)-dimensional charged black hole to all orders in the
Planck length | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the statistical entropy of a scalar field on the (1+1)-dimensional
Maxwell-dilaton background without an artificial cutoff considering corrections
to all orders in the Planck length from a generalized uncertainty principle
(GUP) on the quantum state density. In contrast to the previous results of the
higher dimensional cases having adjustable parameter, we obtain an unadjustable
entropy due to the independence of the minimal length while this entropy is
proportional to the Bekenstein-Hawking entropy.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 02:02:50 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Kim",
"Yong-Wan",
""
],
[
"Park",
"Young-Jai",
""
]
] | [
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] |
802.0543 | Kazem Jahanbakhsh | Kazem Jahanbakhsh, Marzieh Hajhosseini | Improving Performance of Cluster Based Routing Protocol using
Cross-Layer Design | null | null | null | null | cs.NI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main goal of routing protocol is to efficiency delivers data from source
to destination. All routing protocols are the same in this goal, but the way
they adopt to achieve it is different, so routing strategy has an egregious
role on the performance of an ad hoc network. Most of routing protocols
proposed for ad hoc networks have a flat structure. These protocols expand the
control overhead packets to discover or maintain a route. On the other hand a
number of hierarchical-based routing protocols have been developed, mostly are
based on layered design. These protocols improve network performances
especially when the network size grows up since details about remote portion of
network can be handled in an aggregate manner. Although, there is another
approach to design a protocol called cross-layer design. Using this approach
information can exchange between different layer of protocol stack, result in
optimizing network performances.
In this paper, we intend to exert cross-layer design to optimize Cluster
Based Routing Protocol (Cross-CBRP). Using NS-2 network simulator we evaluate
rate of cluster head changes, throughput and packet delivery ratio. Comparisons
denote that Cross-CBRP has better performances with respect to the original
CBRP.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 02:17:30 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Jahanbakhsh",
"Kazem",
""
],
[
"Hajhosseini",
"Marzieh",
""
]
] | [
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] |
802.0544 | Ashoke Sen | Shamik Banerjee, Ashoke Sen, Yogesh K. Srivastava | Generalities of Quarter BPS Dyon Partition Function and Dyons of Torsion
Two | LaTeX file, 63 pages | JHEP 0805:101,2008 | 10.1088/1126-6708/2008/05/101 | null | hep-th | null | We propose a general set of constraints on the partition function of quarter
BPS dyons in any N=4 supersymmetric string theory by drawing insight from known
examples, and study the consequences of this proposal. The main ingredients of
our analysis are duality symmetries, wall crossing formula and black hole
entropy. We use our analysis to constrain the dyon partition function for two
hitherto unknown cases -- the partition function of dyons of torsion two (i.e.
gcd(Q\wedge P)=2) in heterotic string theory on T^6 and the partition function
of dyons carrying untwisted sector electric charge in Z_2 CHL model. With the
help of these constraints we propose a candidate for the partition function of
dyons of torsion two in heterotic string theory on T^6. This leads to a novel
wall crossing formula for decay of quarter BPS dyons into half BPS dyons with
non-primitive charge vectors. In an appropriate limit the proposed formula
reproduces the known result for the spectrum of torsion two dyons in gauge
theory.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 07:10:05 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 03:06:21 GMT"
}
] | 2009-09-15T00:00:00 | [
[
"Banerjee",
"Shamik",
""
],
[
"Sen",
"Ashoke",
""
],
[
"Srivastava",
"Yogesh K.",
""
]
] | [
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802.0545 | Cai-Dian Lu | Wei Wang and Cai-Dian Lu (IHEP, Beijing) | Measuring $D^0-\bar D^0$ mixing in $D^0(\bar D^0)\to f_0(980) K^{*}$ and
more | 7 pages revtex4, no figure | Chinese Physics C 32, 773-775 (2008) | 10.1088/1674-1137/32/10/001 | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We investigate the $D^0-\bar D^0$ mixing through the doubly Cabibbo
suppressed (DCS) channel $D^0\to f_0(980)K^{*0}$ and its charge conjugate
channel, in which the $K^{*0}$ meson is reconstructed in both $K^+\pi^-$ and
$K_S\pi^0$ final state. Although the decay $D^0\to f_0(980)K^{*}$ has a small
branching ratio, the final state mesons are relatively easy to identify. The
$f_0(980)$ meson can be replaced by $\pi^+\pi^-$ in which $\pi^+\pi^-$ form an
$S$-wave state, or a longitudinally polarized vector meson $\rho^0,\omega$. All
mixing parameters, including the mass difference and decay width difference,
can be extracted by studying the time-dependent decay width of these channels.
We show that the method is valid in all regions for mixing parameters and it
does not depend on the strong phase difference.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 03:32:22 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 12:28:26 GMT"
}
] | 2013-06-04T00:00:00 | [
[
"Wang",
"Wei",
"",
"IHEP, Beijing"
],
[
"Lu",
"Cai-Dian",
"",
"IHEP, Beijing"
]
] | [
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802.0546 | Miguel Quartin | Miguel Quartin, Mauricio O. Calvao, Sergio E. Joras, Ribamar R. R.
Reis and Ioav Waga | Dark Interactions and Cosmological Fine-Tuning | 13 pages, 9 figures, accepted for publication in JCAP. Minor
corrections, one figure replaced, references added | JCAP 0805:007,2008 | 10.1088/1475-7516/2008/05/007 | null | astro-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological models involving an interaction between dark matter and dark
energy have been proposed in order to solve the so-called coincidence problem.
Different forms of coupling have been studied, but there have been claims that
observational data seem to narrow (some of) them down to something annoyingly
close to the $\Lambda$CDM model, thus greatly reducing their ability to deal
with the problem in the first place. The smallness problem of the initial
energy density of dark energy has also been a target of cosmological models in
recent years. Making use of a moderately general coupling scheme, this paper
aims to unite these different approaches and shed some light as to whether this
class of models has any true perspective in suppressing the aforementioned
issues that plague our current understanding of the universe, in a quantitative
and unambiguous way.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 03:58:03 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Apr 2008 14:26:18 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Quartin",
"Miguel",
""
],
[
"Calvao",
"Mauricio O.",
""
],
[
"Joras",
"Sergio E.",
""
],
[
"Reis",
"Ribamar R. R.",
""
],
[
"Waga",
"Ioav",
""
]
] | [
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0.039631106,
0.0428057574,
0.0600581691,
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0.0763477758,
0.060266342,
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0.0234195627
] |
802.0547 | Brian Benson | Brian A. Benson | On Using (Z^2, +) Homomorphisms to Generate Pairs of Coprime Integers | 11 pages, no figures. A serious error in terminology has been
corrected. The maps \tau_0 and \tau_1 are homomorphisms but NOT automorphisms
as they are referred to in v1 | null | null | null | math.NT | null | We use the group $(\Z^2,+)$ and two associated homomorphisms, $\tau_0,
\tau_1$, to generate all distinct, non-zero pairs of coprime, positive integers
which we describe within the context of a binary tree which we denote $T$.
While this idea is related to the Stern-Brocot tree and the map of relatively
prime pairs, the parents of an integer pair these trees do not necessarily
correspond to the parents of the same integer pair in $T$. Our main result is a
proof that for $x_i \in \{0,1\}$, the sum of the pair $\tau_{x_1}\tau_{x_2}...
\tau_{x_n} [1,2]$ is equal to the sum of the pair $\tau_{x_n}\tau_{x_{n-1}} ...
\tau_{x_1} [1,2]$. Further, we give a conjecture as to the well-ordering of the
sums of these integers.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 05:39:45 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Feb 2008 23:09:14 GMT"
}
] | 2008-02-18T00:00:00 | [
[
"Benson",
"Brian A.",
""
]
] | [
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802.0548 | Jing Wang | J. Wang and J. Y. Wei | Understanding AGN-Host Connection in Partially Obscured Active Galactic
Nuclei. Part I: The Nature of AGN+HII Composites | 39 pages, 11 figures, 1 table, accepted by ApJ | null | 10.1086/587048 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of our serial papers is to examine the evolutionary connection
between AGN and star formation in its host galaxy in the partially obscured
AGNs (i.e., Seyfert 1.8 and 1.9 galaxies). Taking advantage of these galaxies,
the properties of both components can be studied together by direct
measurements. In this paper, we focus on the broad-line composite galaxies
(composite AGNs) which are located between the theoretical and empirical
separation lines in the [NII]/Ha vs. [OIII]/Hb diagram. These galaxies are
searched for from the composite galaxies provided by the SDSS DR4 MPA/JHU
catalogs. After re-analyze the spectra, we perform a fine classification for
the 85 composite AGNs in terms of the BPT diagrams. All the objects located
below the three theoretical separation lines are associated with a young
stellar population (<1Gyrs), while either a young or old stellar population is
identified in the individual multiply-classified object. The
multiply-classified objects with a very old stellar population are located in
the LINER region in the [OI]/Ha vs. [OIII]/Hb diagram. We then consider the
connection between AGN and star formation to derive the key results. The
Eddington ratio inferred from the broad Ha emission, the age of the stellar
population of AGN's host as assessed by D_n(4000), and the line ratio [OI]/Ha
are found to be related with each other. These relations strongly support the
evolutionary scenario in which AGNs evolve from high L/L_Edd state with soft
spectrum to low L/L_Edd state with hard spectrum as young stellar population
ages and fades. The significant correlation between the line ratio [OI]/Ha and
D_n(4000) leads us to suggest that the line ratio could be used to trace the
age of stellar population in type I AGNs.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 05:32:28 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Wang",
"J.",
""
],
[
"Wei",
"J. Y.",
""
]
] | [
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802.0549 | Christophe Mora | Alexander O. Gogolin, Christophe Mora, and Reinhold Egger | Analytical solution of the bosonic three-body problem | 4 pages, published version | Phys. Rev. Lett. 100, 140404 (2008) | 10.1103/PhysRevLett.100.140404 | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the problem of three identical bosons in free space, which
exhibits a universal hierarchy of bound states (Efimov trimers). Modelling a
narrow Feshbach resonance within a two-channel description, we map the integral
equation for the three-body scattering amplitude to a one-dimensional
Schr\"odinger-type single-particle equation, where an analytical solution of
exponential accuracy is obtained. We give exact results for the trimer binding
energies, the three-body parameter, the threshold to the three-atom continuum,
and the recombination rate.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 20:26:05 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Apr 2008 15:30:09 GMT"
}
] | 2008-04-17T00:00:00 | [
[
"Gogolin",
"Alexander O.",
""
],
[
"Mora",
"Christophe",
""
],
[
"Egger",
"Reinhold",
""
]
] | [
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] |
802.055 | Vincent Gramoli | Erwan Le Merrer (IRISA, FT R&D), Vincent Gramoli (IRISA), Anne-Marie
Kermarrec (IRISA), Aline Viana (IRISA), Marin Bertier (IRISA) | Energy Aware Self-Organizing Density Management in Wireless Sensor
Networks | null | Dans International Workshop on Decentralized Resource Sharing in
Mobile Computing and Networking (2006) 23--29 | null | null | cs.DC | null | Energy consumption is the most important factor that determines sensor node
lifetime. The optimization of wireless sensor network lifetime targets not only
the reduction of energy consumption of a single sensor node but also the
extension of the entire network lifetime. We propose a simple and adaptive
energy-conserving topology management scheme, called SAND (Self-Organizing
Active Node Density). SAND is fully decentralized and relies on a distributed
probing approach and on the redundancy resolution of sensors for energy
optimizations, while preserving the data forwarding and sensing capabilities of
the network. We present the SAND's algorithm, its analysis of convergence, and
simulation results. Simulation results show that, though slightly increasing
path lengths from sensor to sink nodes, the proposed scheme improves
significantly the network lifetime for different neighborhood densities
degrees, while preserving both sensing and routing fidelity.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 07:03:28 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Merrer",
"Erwan Le",
"",
"IRISA, FT R&D"
],
[
"Gramoli",
"Vincent",
"",
"IRISA"
],
[
"Kermarrec",
"Anne-Marie",
"",
"IRISA"
],
[
"Viana",
"Aline",
"",
"IRISA"
],
[
"Bertier",
"Marin",
"",
"IRISA"
]
] | [
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] |
802.0551 | Pulak Ranjan Giri | Pulak Ranjan Giri | Inverse square problem and so(2,1) symmetry in noncommutative space | 5 pages, Revised version | Int.J.Mod.Phys.A24:2655-2663,2009 | 10.1142/S0217751X09043365 | SINP/TNP/2008/03 | hep-th math-ph math.MP quant-ph | null | We study the quantum mechanics of a system with inverse square potential in
noncommutative space. Both the coordinates and momentums are considered to be
noncommutative, which breaks the original so(2,1) symmetry. The energy levels
and eigenfunctions are obtained. The generators of the so(2,1) algebra are also
studied in noncommutative phase space and the commutators are calculated, which
shows that the so(2,1) algebra obtained in noncommutative space is not closed.
However the commutative limit \Theta,\bar{\Theta}\to 0 for the algebra smoothly
goes to the standard so(2,1) algebra.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 12:24:23 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 09:06:40 GMT"
},
{
"version": "v3",
"created": "Tue, 15 Apr 2008 10:45:05 GMT"
}
] | 2009-06-16T00:00:00 | [
[
"Giri",
"Pulak Ranjan",
""
]
] | [
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] |
802.0552 | Vincent Gramoli | Vincent Gramoli (INRIA Futurs), Michel Raynal (IRISA) | Timed Quorum System for Large-Scale and Dynamic Environments | null | Dans 11th International Conference On Principles Of Distributed
Systems 4878 (2007) 429--442 | null | null | cs.DC cs.NI | null | This paper presents Timed Quorum System (TQS), a new quorum system especially
suited for large-scale and dynamic systems. TQS requires that two quorums
intersect with high probability if they are used in the same small period of
time. It proposed an algorithm that implements TQS and that verifies
probabilistic atomicity: a consistency criterion that requires each operation
to respect atomicity with high probability. This TQS implementation has quorum
of size O(\sqrt{nD}) and expected access time of O(log \sqrt{nD}) message
delays, where n measures the size of the system and D is a required parameter
to handle dynamism.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 07:09:08 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Gramoli",
"Vincent",
"",
"INRIA Futurs"
],
[
"Raynal",
"Michel",
"",
"IRISA"
]
] | [
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] |
802.0553 | Patrick Rinke | Jutta Rogal, Karsten Reuter, and Matthias Scheffler | CO oxidation on Pd(100) at technologically relevant pressure conditions:
A first-principles kinetic Monte Carlo study | 13 pages including 5 figures; related publications can be found at
http://www.fhi-berlin.mpg.de/th/th.html | null | 10.1103/PhysRevB.77.155410 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible importance of oxide formation for the catalytic activity of
transition metals in heterogenous oxidation catalysis has evoked a lively
discussion over the recent years. On the more noble transition metals (like Pd,
Pt or Ag) the low stability of the common bulk oxides suggests primarily
sub-nanometer thin oxide films, so-called surface oxides, as potential
candidates that may be stabilized under gas phase conditions representative of
technological oxidation catalysis. We address this issue for the Pd(100) model
catalyst surface with first-principles kinetic Monte Carlo (kMC) simulations
that assess the stability of the well-characterized (sqrt{5} x sqrt{5})R27
surface oxide during steady-state CO oxidation. Our results show that at
ambient pressure conditions the surface oxide is stabilized at the surface up
to CO:O2 partial pressure ratios just around the catalytically most relevant
stoichiometric feeds (p(CO):p(O2) = 2:1). The precise value depends sensitively
on temperature, so that both local pressure and temperature fluctuations may
induce a continuous formation and decomposition of oxidic phases during
steady-state operation under ambient stoichiometric conditions.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 07:10:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rogal",
"Jutta",
""
],
[
"Reuter",
"Karsten",
""
],
[
"Scheffler",
"Matthias",
""
]
] | [
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802.0554 | Brian Kurkoski | Brian M. Kurkoski and Justin Dauwels | Message-Passing Decoding of Lattices Using Gaussian Mixtures | Cite this paper as: Brian Kurkoski and Justin Dauwels,
"Message-passing decoding of lattices using Gaussian mixtures," in
Proceedings of the 30th Symposium on Information Theory and its Applications
(SITA 2007), pp. 877-882, November 27-30, 2007, Shima, Mie, Japan | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A lattice decoder which represents messages explicitly as a mixture of
Gaussians functions is given. In order to prevent the number of functions in a
mixture from growing as the decoder iterations progress, a method for replacing
N Gaussian functions with M Gaussian functions, with M < N, is given. A squared
distance metric is used to select functions for combining. A pair of selected
Gaussians is replaced by a single Gaussian with the same first and second
moments. The metric can be computed efficiently, and at the same time, the
proposed algorithm empirically gives good results, for example, a dimension 100
lattice has a loss of 0.2 dB in signal-to-noise ratio at a probability of
symbol error of 10^{-5}.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 07:12:38 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Kurkoski",
"Brian M.",
""
],
[
"Dauwels",
"Justin",
""
]
] | [
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] |
802.0555 | Matthew Sudano | Elie Gorbatov, Matthew Sudano | Sparticle Masses in Higgsed Gauge Mediation | typos in formulas in the appendix corrected | JHEP 0810:066,2008 | 10.1088/1126-6708/2008/10/066 | UCSD-PTH-08-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the gauge sector of gauge-mediated supersymmetry breaking to
allow for an arbitrary gauge group with an arbitrary supersymmetric Higgsing.
The sparticle masses are computed to leading order in the gauge coupling. The
generic effect on the MSSM spectrum from additional Higgsed gauge structure is
to increase the sfermion masses relative to the gaugino masses.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 07:34:03 GMT"
},
{
"version": "v2",
"created": "Wed, 21 Dec 2011 17:57:52 GMT"
}
] | 2011-12-22T00:00:00 | [
[
"Gorbatov",
"Elie",
""
],
[
"Sudano",
"Matthew",
""
]
] | [
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802.0556 | Tijana Milenkovi\'c | Tijana Milenkovic and Natasa Przulj | Uncovering Biological Network Function via Graphlet Degree Signatures | First submitted to Nature Biotechnology on July 16, 2007. Presented
at BioPathways'07 pre-conference of ISMB/ECCB'07, July 19-20, 2007, Vienna,
Austria. Published in full in the Posters section of the Schedule of the
RECOMB Satellite Conference on Systems Biology, November 30 - December 1,
2007, University of California, San Diego, USA | null | null | Technical Report No. 08-01 | q-bio.MN | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Proteins are essential macromolecules of life and thus understanding their
function is of great importance. The number of functionally unclassified
proteins is large even for simple and well studied organisms such as baker's
yeast. Methods for determining protein function have shifted their focus from
targeting specific proteins based solely on sequence homology to analyses of
the entire proteome based on protein-protein interaction (PPI) networks. Since
proteins aggregate to perform a certain function, analyzing structural
properties of PPI networks may provide useful clues about the biological
function of individual proteins, protein complexes they participate in, and
even larger subcellular machines.
We design a sensitive graph theoretic method for comparing local structures
of node neighborhoods that demonstrates that in PPI networks, biological
function of a node and its local network structure are closely related. The
method groups topologically similar proteins under this measure in a PPI
network and shows that these protein groups belong to the same protein
complexes, perform the same biological functions, are localized in the same
subcellular compartments, and have the same tissue expressions. Moreover, we
apply our technique on a proteome-scale network data and infer biological
function of yet unclassified proteins demonstrating that our method can provide
valuable guidelines for future experimental research.
| [
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802.0557 | Allan R. Sampson | Allan R. Sampson | A Conversation with Ingram Olkin | Published in at http://dx.doi.org/10.1214/088342307000000122 the
Statistical Science (http://www.imstat.org/sts/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Statistical Science 2007, Vol. 22, No. 3, 450-475 | 10.1214/088342307000000122 | IMS-STS-STS231 | stat.ME | null | Ingram Olkin was born on July 23, 1924 in Waterbury, Connecticut. His family
moved to New York in 1934 and he graduated from DeWitt Clinton High School in
1941. He served three years in the Air Force during World War II and obtained a
B.S. in mathematics at the City College of New York in 1947. After receiving an
M.A. in mathematical statistics from Columbia in 1949, he completed his
graduate studies in the Department of Statistics at the University of North
Carolina in 1951. His dissertation was written under the direction of S. N. Roy
and Harold Hotelling. He joined the Department of Mathematics at Michigan State
University in 1951 as an Assistant Professor, subsequently being promoted to
Professor. In 1960, he took a position as Chair of the Department of Statistics
at the University of Minnesota. He moved to Stanford University in 1961 to take
a joint position as Professor of Statistics and Professor of Education; he was
also Chair of the Department of Statistics from 1973--1976. In 2007, Ingram
became Professor Emeritus. Ingram was Editor of the Annals of Mathematical
Statistics (1971--1972) and served as the first editor of the Annals of
Statistics from 1972--1974. He was a primary force in the founding of the
Journal of Educational Statistics, for which he was also Associate Editor
during 1977--1985. In 1984, he was President of the Institute of Mathematical
Statistics. Among his many professional activities, he has served as Chair of
the Committee of Presidents of Statistical Societies (COPSS), Chair of the
Committee on Applied and Theoretical Statistics of the National Research
Council, Chair of the Management Board of the American Education Research
Association, and as Trustee for the National Institute of Statistical Sciences.
He has been honored by the American Statistical Association (ASA) with a Wilks
Medal (1992) and a Founder's Award (1992). The American Psychological
Association gave him a Lifetime Contribution Award (1997) and he was elected to
the National Academy of Education in 2005. He received the COPSS Elizabeth L.
Scott Award in 1998 and delivered the R. A. Fisher Lecture in 2000. In 2003,
the City University of New York gave him a Townsend Harris Medal. An author of
5 books, an editor of 10 books, and an author of more than 200 publications,
Ingram has made major contributions to statistics and education. His research
has focused on multivariate analysis, majorization and inequalities,
distribution theory, and meta-analysis. A volume in celebration of Ingram's
65th birthday contains a brief biography and an interview [Gleser, Perlman,
Press and Sampson (1989)]. Ingram was chosen in 1997 to participate in the
American Statistical Association Distinguished Statistician Video Series and a
videotaped conversation and a lecture (Olkin, 1997) are available from the ASA
(1997, DS041, DS042).
| [
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0.0333080776,
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] |
802.0558 | Niels Asger Mortensen | Jesper Pedersen, Sanshui Xiao, and Niels Asger Mortensen | Slow-light enhanced absorption for bio-chemical sensing applications:
potential of low-contrast lossy materials | 9 pages including 3 figures | J. Eur. Opt. Soc., Rapid Publ. 3, 08007 (2008) | 10.2971/jeos.2008.08007 | null | physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Slow-light enhanced absorption in liquid-infiltrated photonic crystals has
recently been proposed as a route to compensate for the reduced optical path in
typical lab-on-a-chip systems for bio-chemical sensing applications. A simple
perturbative expression has been applied to ideal structures composed of
lossless dielectrics. In this work we study the enhancement in structures
composed of lossy dielectrics such as a polymer. For this particular sensing
application we find that the material loss has an unexpected limited drawback
and surprisingly, it may even add to increase the bandwidth for low-index
contrast systems such as polymer devices.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 07:48:29 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Pedersen",
"Jesper",
""
],
[
"Xiao",
"Sanshui",
""
],
[
"Mortensen",
"Niels Asger",
""
]
] | [
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] |
802.0559 | Daisuke Yamamoto | Daisuke Yamamoto, Synge Todo, Susumu Kurihara | Green's function theory for spin-1/2 ferromagnets with an easy-plane
exchange anisotropy | 8 pages, 2 figures; some comments and references added | Phys. Rev. B 78, 024440 (2008) | 10.1103/PhysRevB.78.024440 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The many-body Green's function theory with the random-phase approximation is
applied to the study of easy-plane spin-1/2 ferromagnets in an in-plane
magnetic field. We demonstrate that the usual procedure, in which only the
three Green's functions $<< S_i^\mu;S_j^->>$ ($\mu=+,-,z$) are used, yields
unreasonable results in this case. Then the problem is discussed in more detail
by considering all combinations of Green's functions. We can derive one more
equation, which cannot be obtained by using only the set of the above three
Green's functions, and point out that the two equations contradict each other
if one demands that the identities of the spin operators are exactly satisfied.
We discuss the cause of the contradiction and attempt to improve the method in
a self consistent way. In our procedure, the effect of the anisotropy can be
appropriately taken into account, and the results are in good agreement with
the quantum Monte Carlo calculations.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 07:49:19 GMT"
},
{
"version": "v2",
"created": "Wed, 3 Sep 2008 08:29:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yamamoto",
"Daisuke",
""
],
[
"Todo",
"Synge",
""
],
[
"Kurihara",
"Susumu",
""
]
] | [
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] |
802.056 | Vasily Klimov | V.V. Klimov, D. Bloch, M. Ducloy, J.R.Rios Leite | Detection of Spiral photons in Quantum Optics | 5 pages, 4 figures | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a new type of photon detector, sensitive to the gradients of
electromagnetic fields, should be a useful tool to characterize the quantum
properties of spatially-dependent optical fields. As a simple detector of such
a kind, we propose using magnetic dipole or electric quadrupole transitions in
atoms or molecules and apply it to the detection of spiral photons in
Laguerre-Gauss (LG) beams. We show that LG beams are not true hollow beams, due
to the presence of magnetic fields and gradients of electric fields on beam
axis. This approach paves the way to an analysis at the quantum level of the
spatial structure and angular momentum properties of singular light beams.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 07:50:43 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Klimov",
"V. V.",
""
],
[
"Bloch",
"D.",
""
],
[
"Ducloy",
"M.",
""
],
[
"Leite",
"J. R. Rios",
""
]
] | [
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] |
802.0561 | Johannes-Geert Hagmann | Johannes-Geert Hagmann, Lasha Tkeshelashvili, Kurt Busch, Guido
Schneider | Far-off-resonant wave interaction in one-dimensional photonic crystals
with quadratic nonlinearity | 14 pages, 4 figures | Physical Review A: Atomic, Molecular and Optical Physics 77 (2008)
023809 | 10.1103/PhysRevA.77.023809 | null | physics.optics | null | We extend a recently developed Hamiltonian formalism for nonlinear wave
interaction processes in spatially periodic dielectric structures to the
far-off-resonant regime, and investigate numerically the three-wave resonance
conditions in a one-dimensional optical medium with $\chi^{(2)}$ nonlinearity.
In particular, we demonstrate that the cascading of nonresonant wave
interaction processes generates an effective $\chi^{(3)}$ nonlinear response in
these systems. We obtain the corresponding coupling coefficients through
appropriate normal form transformations that formally lead to the Zakharov
equation for spatially periodic optical media.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 08:20:39 GMT"
}
] | 2008-02-08T00:00:00 | [
[
"Hagmann",
"Johannes-Geert",
""
],
[
"Tkeshelashvili",
"Lasha",
""
],
[
"Busch",
"Kurt",
""
],
[
"Schneider",
"Guido",
""
]
] | [
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] |
802.0562 | Maurizio Spurio | G. Carminati, A. Margiotta, M. Spurio | Atmospheric MUons from PArametric formulas: a fast GEnerator for
neutrino telescopes (MUPAGE) | 20 pages, 4 figures | Comput.Phys.Commun.179:915-923,2008 | 10.1016/j.cpc.2008.07.014 | null | physics.ins-det astro-ph hep-ex hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino telescopes will open, in the next years, new opportunities in
observational high energy astrophysics. For these experiments, atmospheric
muons from primary cosmic ray interactions in the atmosphere play an important
role, because they provide the most abundant source of events for calibration
and test. On the other side, they represent the major background source.
In this paper a fast Monte Carlo generator (called MUPAGE) of bundles of
atmospheric muons for underwater/ice neutrino telescopes is presented. MUPAGE
is based on parametric formulas [APP25(2006)1] obtained from a full Monte Carlo
simulation of cosmic ray showers generating muons in bundle, which are
propagated down to 5 km w.e. It produces the event kinematics on the surface of
a user-defined virtual cylinder, surrounding the detector. The multiplicity of
the muons in the bundle, the muon spatial distribution and energy spectrum are
simulated according to a specific model of primary cosmic ray flux, with
constraints from measurements of the muon flux with underground experiments. As
an example of the application, the result of the generation of events on a
cylindrical surface of 3 km^2 at a depth of 2450 m of water is presented.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 08:27:36 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Jul 2008 13:08:05 GMT"
}
] | 2009-01-01T00:00:00 | [
[
"Carminati",
"G.",
""
],
[
"Margiotta",
"A.",
""
],
[
"Spurio",
"M.",
""
]
] | [
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] |
802.0563 | Janusz Morawiec | Janusz Morawiec | On continuous solutions of a problem of R.Schilling | 6 pages | Results Math. 27 (1995), 381-386 | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with continuous solutions of a Schilling's problem.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 08:31:35 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Morawiec",
"Janusz",
""
]
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] |
802.0564 | Nasser Metwally NM | N. Metwally, M. Abdel-Aty and M. Sebawe Abdalla | Controlling the quantum computational speed | 9 pages, 10 figures | Int. J. Mod. Phys. B 24, 4143-4151 (2008). | 10.1142/S0217979208049029 | null | quant-ph | http://creativecommons.org/licenses/by/3.0/ | The speed of quantum computation is investigated through the time evolution
of the speed of the orthogonality. The external field components for classical
treatment beside the detuning and the coupling parameters for quantum treatment
play important roles on the computational speed. It has been shown that the
number of photons has no significant effect on the speed of computation.
However, it is very sensitive to the variation in both detuning and the
interaction coupling parameters.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 08:41:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Metwally",
"N.",
""
],
[
"Abdel-Aty",
"M.",
""
],
[
"Abdalla",
"M. Sebawe",
""
]
] | [
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] |
802.0565 | Michael Ruzhansky | Michael Ruzhansky and Mitsuru Sugimoto | Criteria for Bochner's extension problem | 12 pages | Asymptotic Analysis, 66 (2010), 125-138 | null | null | math.AP math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A necessary and sufficient condition for the resolution of the weak extension
problem is given. This criterion is applied to also give a criterion for the
solvability of the classical Bochner's extension problem in the $L^p$-category.
The solution of the $L^p$-extension problem by Bochner giving the relation
between the order of the operator, the dimension, and index $p$, for which the
$L^p$-extension property holds, can be viewed as a subcritical case of the
general $L^p$-extension problem. In general, this property fails in some
critical and in all supercritical cases. In this paper, the $L^p$-extension
problem is investigated for operators of all orders and for all $1\leq
p\leq\infty$. Necessary and sufficient conditions on the subset of $L^p$ are
given for which the $L^p$-extension property still holds, in the critical and
supercritical cases.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 08:54:16 GMT"
}
] | 2012-08-10T00:00:00 | [
[
"Ruzhansky",
"Michael",
""
],
[
"Sugimoto",
"Mitsuru",
""
]
] | [
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] |
802.0566 | Sylvain Arlot | Sylvain Arlot (LM-Orsay, INRIA Futurs) | V-fold cross-validation improved: V-fold penalization | 40 pages, plus a separate technical appendix | null | null | null | math.ST stat.ML stat.TH | null | We study the efficiency of V-fold cross-validation (VFCV) for model selection
from the non-asymptotic viewpoint, and suggest an improvement on it, which we
call ``V-fold penalization''. Considering a particular (though simple)
regression problem, we prove that VFCV with a bounded V is suboptimal for model
selection, because it ``overpenalizes'' all the more that V is large. Hence,
asymptotic optimality requires V to go to infinity. However, when the
signal-to-noise ratio is low, it appears that overpenalizing is necessary, so
that the optimal V is not always the larger one, despite of the variability
issue. This is confirmed by some simulated data. In order to improve on the
prediction performance of VFCV, we define a new model selection procedure,
called ``V-fold penalization'' (penVF). It is a V-fold subsampling version of
Efron's bootstrap penalties, so that it has the same computational cost as
VFCV, while being more flexible. In a heteroscedastic regression framework,
assuming the models to have a particular structure, we prove that penVF
satisfies a non-asymptotic oracle inequality with a leading constant that tends
to 1 when the sample size goes to infinity. In particular, this implies
adaptivity to the smoothness of the regression function, even with a highly
heteroscedastic noise. Moreover, it is easy to overpenalize with penVF,
independently from the V parameter. A simulation study shows that this results
in a significant improvement on VFCV in non-asymptotic situations.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 08:56:27 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 11:34:45 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Arlot",
"Sylvain",
"",
"LM-Orsay, INRIA Futurs"
]
] | [
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] |
802.0567 | Mil\'an Mosonyi | M. Mosonyi, F. Hiai, T. Ogawa, M. Fannes | Asymptotic distinguishability measures for shift-invariant quasi-free
states of fermionic lattice systems | Results extended to higher dimensional lattices, title changed.
Submitted version | J. Math. Phys. 49 072104 (2008) | 10.1063/1.2953473 | null | quant-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the recent results of F. Hiai, M. Mosonyi and T. Ogawa
[arXiv:0707.2020, to appear in J. Math. Phys.] to the asymptotic hypothesis
testing problem of locally faithful shift-invariant quasi-free states on a CAR
algebra. We use a multivariate extension of Szego's theorem to show the
existence of the mean Chernoff and Hoeffding bounds and the mean relative
entropy, and show that these quantities arise as the optimal error exponents in
suitable settings.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 08:56:48 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Mar 2008 03:56:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mosonyi",
"M.",
""
],
[
"Hiai",
"F.",
""
],
[
"Ogawa",
"T.",
""
],
[
"Fannes",
"M.",
""
]
] | [
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802.0568 | Yunseok Seo | Yunseok Seo, Sang-Jin Sin (Hanyang U.) | Baryon Mass in medium with Holographic QCD | 24 pages, 14 figures, RevTeX, Typos and errors corrected | JHEP 0804:010,2008 | 10.1088/1126-6708/2008/04/010 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the baryon vertex (BV) in the presence of medium using DBI action
and the force balance condition between BV and the probe branes. We note that a
stable BV configuration exists only in some of the confining backgrounds. For
the system of finite density, the issue is whether there is a canonical
definition for the baryon mass in the medium. In this work, we define it as the
energy of the deformed BV satisfying the force balance condition (FBC) with the
probe brane. With FBC, lengths of the strings attached to the BV tend to be
zero while the compact branes are enlongated to mimic the string. We attribute
the deformation energy of the probe brane to the baryon-baryon interaction. We
show that for a system with heavy quarks the baryon mass drops monotonically as
a function of density while it has minimum in case of light quark system.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 08:58:59 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 10:08:57 GMT"
},
{
"version": "v3",
"created": "Thu, 28 Aug 2008 12:45:10 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Seo",
"Yunseok",
"",
"Hanyang U."
],
[
"Sin",
"Sang-Jin",
"",
"Hanyang U."
]
] | [
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] |
802.0569 | Mukut Tripathi Dr. | Mukut Mani Tripathi | A new connection in a Riemannian manifold | 14 pages. to appear in International Electronic Journal of Geometry | null | null | null | math.DG math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a Riemannian manifold, the existence of a new connection is proved. In
particular cases, this connection reduces to several symmetric, semi-symmetric
and quarter-symmetric connections; even some of them are not introduced so far.
We also find formula for curvature tensor of this new connection.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 09:03:44 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Tripathi",
"Mukut Mani",
""
]
] | [
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] |
802.057 | Marian Lazar | M. Lazar, R. Schlickeiser and P. K. Shukla | Cumulative effect of Weibel-type instabilities in counterstreaming
plasmas with non-Maxwellian anisotropies | null | null | 10.1063/1.2896232 | null | physics.plasm-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Counterstreaming plasma structures are widely present in laboratory
experiments and astrophysical systems, and they are investigated either to
prevent unstable modes arising in beam-plasma experiments or to prove the
existence of large scale magnetic fields in astrophysical objects.
Filamentation instability arises in a counterstreaming plasma and is
responsible for the magnetization of the plasma. Filamentationally unstable
mode is described by assuming that each of the counterstreaming plasmas has an
isotropic Lorentzian (kappa) distribution. In this case, the filamentation
instability growth rate can reach a maximum value markedly larger than that for
a a plasma with a Maxwellian distribution function. This behaviour is opposite
to what was observed for the Weibel instability growth rate in a bi-kappa
plasma, which is always smaller than that obtained for a bi-Maxwellian plasma.
The approach is further generalized for a counterstreaming plasma with a
bi-kappa temperature anisotropy. In this case, the filamentation instability
growth rate is enhanced by the Weibel effect when the plasma is hotter in the
streaming direction, and the growth rate becomes even larger. These effects
improve significantly the efficiency of the magnetic field generation, and
provide further support for the potential role of the Weibel-type instabilities
in the fast magnetization scenarios.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 09:05:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lazar",
"M.",
""
],
[
"Schlickeiser",
"R.",
""
],
[
"Shukla",
"P. K.",
""
]
] | [
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] |
802.0571 | A.K. Srivastava Dr. | A.K. Srivastava, D. Kuridze, T.V. Zaqarashvili, and B.N. Dwivedi | Intensity oscillations observed with Hinode near the south pole of the
Sun: leakage of low frequency magneto-acoustic waves into the solar corona | 12 pages, 6 figures | null | 10.1051/0004-6361:20079328 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Aims. To study intensity oscillations in the solar chromosphere/corona above
a quiet-Sun magnetic network. Methods. We analyse the time series of He II
256.32, Fe XI 188.23 and Fe XII 195.12 spectral lines observed by EUV Imaging
Spectrometer (EIS) on board Hinode near the south pole. Then we use a standard
wavelet tool to produce power spectra of intensity oscillations above the
magnetic network. Results. We get ~7 min intensity oscillations in all spectral
lines and ~13 min intensity oscillations only in He II with the probability of
~96-98 %, which probably reflects the process of magneto-acoustic wave
propagation above the network. Conclusions. We suggest that field-free cavity
areas under bipolar magnetic canopies in the vicinity of magnetic network may
serve as resonators for the magneto-acoustic waves. The cavities with
photospheric sound speed and granular dimensions may produce the waves with the
observed periods. The waves may propagate upwards in the transition
region/corona and cause observed intensity oscillations.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 09:05:59 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 14:18:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Srivastava",
"A. K.",
""
],
[
"Kuridze",
"D.",
""
],
[
"Zaqarashvili",
"T. V.",
""
],
[
"Dwivedi",
"B. N.",
""
]
] | [
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] |
802.0572 | Liangpan Li | Liangpan Li | On the number of collinear triples in permutations | 4 pages | null | null | null | math.CO | null | Let $\alpha:\mathbb{Z}_n\to\mathbb{Z}_n$ be a permutation and $\Psi(\alpha)$
be the number of collinear triples modulo $n$ in the graph of $\alpha$. Cooper
and Solymosi had given by induction the bound
$\min_{\alpha}\Psi(\alpha)\geq\lceil(n-1)/4\rceil$ when $n$ is a prime number.
The main purpose of this paper is to give a direct proof of that bound.
Besides, the expected number of collinear triples a permutation can have is
also been determined.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:18:10 GMT"
},
{
"version": "v2",
"created": "Fri, 2 May 2008 07:26:38 GMT"
}
] | 2008-05-02T00:00:00 | [
[
"Li",
"Liangpan",
""
]
] | [
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802.0573 | M. P. Garcia del Moral | M.P. Garcia del Moral, I. Martin, A. Restuccia | Nonperturbative SL(2,Z) (p,q)-strings manifestly realized on the quantum
M2 | 32pages, latex | null | null | DFTT-29/2008, AEI-2008-002 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The SL(2,Z) duality symmetry of IIB superstring is naturally realized on the
D=11 supermembrane restricted to have central charges arising from a nontrivial
wrapping. This supermembrane is minimally immersed on the target space (MIM2).
The hamiltonian of the MIM2 has a discrete quantum spectrum. It is manifestly
invariant under the SL(2,Z) symmetry associated to the conformal symmetry on
the base manifold and under a SL(2,Z) symmetry on the moduli of the target
space. The mass contribution of the string states on the MIM2 is obtained by
freezing the remaining degrees of freedom. It exactly agrees with the
perturbative spectrum of the (p,q) IIB and IIA superstring compactified on a
circle. We also construct a MIM2 in terms of a dual target space, then a (p,q)
set of non-perturbative states associated to the IIA superstring is obtained.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 09:24:20 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"del Moral",
"M. P. Garcia",
""
],
[
"Martin",
"I.",
""
],
[
"Restuccia",
"A.",
""
]
] | [
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] |
802.0574 | Tal Verdene | Tal Verdene, Haim Beidenkopf, Yuri Myasoedov, Hadas Shtrikman, Michael
Rappaport, Eli Zeldov and Tsuyoshi Tamegai | Multiple Changes of Order of the Vortex Melting Transition in BSCCO with
Dilute Columnar Defects | 5 pages, 3 figures | null | 10.1103/PhysRevLett.101.157003 | null | cond-mat.supr-con | null | A low concentration of columnar defects is reported to transform a
first-order vortex lattice melting line in BSCCO crystals into alternating
segments of first-order and second-order transitions separated by two critical
points. As the density of CDs is increased, the critical points shift apart and
the range of the intermediate second-order transition expands. A third, low
temperature critical point was also observed in one sample. The measurement of
equilibrium magnetization and the mapping of the melting line down to 27K was
made possible by employment of the shaking technique.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 09:39:22 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 09:16:16 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Mar 2008 09:18:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Verdene",
"Tal",
""
],
[
"Beidenkopf",
"Haim",
""
],
[
"Myasoedov",
"Yuri",
""
],
[
"Shtrikman",
"Hadas",
""
],
[
"Rappaport",
"Michael",
""
],
[
"Zeldov",
"Eli",
""
],
[
"Tamegai",
"Tsuyoshi",
""
]
] | [
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] |
802.0575 | Iver Brevik | Ole Jakob Birkeland and Iver Brevik | Nonlinear Laser-Induced Deformations of Liquid-Liquid Interfaces: an
Optical Fiber Model | 24 pages latex, 7 figures; major revisions. Version to appear in
Phys. Rev. E | null | 10.1103/PhysRevE.78.066314 | null | physics.optics physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Experimentally, it turns out that radiation forces from a cw-laser on a
liquid-liquid interface are able to produce giant deformations (up to about
100\mu m), if the system is close to the critical point where the surface
tension becomes small. We present a new model for such a fingerlike
deformation, implying that the system is described as an optical fiber. One
reason for introducing such a model is that the refractive index difference in
modern experiments, such as those of the Bordeaux group, is small, of the same
order as in practical fibers in optics. It is natural therefore, to adopt the
hybrid HE_{11} mode, known from fiber theory, as the fundamental mode for the
liquid system. We show how the balance between hydrodynamical and radiation
forces leads to a stable equilibrium point for the liquid column. Also, we
calculate the narrowing of the column radius as the depth increases. Comparison
with experimental results of the Bordeaux group yields quite satisfactory
agreement as regards the column width.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 09:40:24 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Nov 2008 10:04:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Birkeland",
"Ole Jakob",
""
],
[
"Brevik",
"Iver",
""
]
] | [
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802.0576 | Javier Almeida | J. Almeida, M. A. Martin-Delgado, G. Sierra | Twisted Order Parameter applied to Dimerized Ladders | Revtex4 file, color figures | J. Phys. A: Math. Theor. 41, 485301 (2008) | 10.1088/1751-8113/41/48/485301 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the twisted order parameter (TOP) for dimerized quantum spin ladders
to locate the critical phases that separate gapped phases representing quantum
spin liquids of various types. Using the DMRG, method we find that the TOP is a
good order parameter for these systems regardless the number of legs. As a
check, we reproduce with DMRG and periodic boundary conditions the computations
previously done with Quantum Montecarlo for one-dimensional S=1/2, S=1, S=3/2
and S=2 Heisenberg chains with alternating bonds.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 09:44:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Almeida",
"J.",
""
],
[
"Martin-Delgado",
"M. A.",
""
],
[
"Sierra",
"G.",
""
]
] | [
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802.0577 | Alejandro Bermudez | A. Bermudez, M.A. Martin-Delgado and A.Luis | Chirality Quantum Phase Transition in the Dirac oscillator | RevTex4 file, color figures, submitted for publication | Phys. Rev. A 77, 063815 (2008) | 10.1103/PhysRevA.77.063815 | null | quant-ph cond-mat.other hep-th | null | We study a relativistic spin-1/2 fermion subjected to a Dirac oscillator
coupling and a constant magnetic field. An interplay between opposed chirality
interactions culminates in the appearance of a relativistic quantum phase
transition, which can be fully characterized. We obtain analytical expressions
for the energy gap, order parameter, and canonical quantum fluctuations across
the critical point. Moreover, we also discuss the effect of this phase
transition on the statistics of the chiral bosonic ensemble, where its super-
or sub-Poissonian nature can be controled by means of external parameters.
Finally, we study the entanglement properties between the degrees of freedom in
the relativistic ground state, where an interesting transition between a
bi-separable and a genuinely tripartite entangled state occurs.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:05:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bermudez",
"A.",
""
],
[
"Martin-Delgado",
"M. A.",
""
],
[
"Luis",
"A.",
""
]
] | [
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] |
802.0578 | Veronica Felli | Veronica Felli | On the existence of ground state solutions to nonlinear Schoedinger
equations with multisingular inverse-square anisotropic potentials | null | null | null | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of nonlinear Schroedinger equations with critical
power-nonlinearities and potentials exhibiting multiple anisotropic inverse
square singularities is investigated. Conditions on strength, location, and
orientation of singularities are given for the minimum of the associated
Rayleigh quotient to be achieved, both in the whole $\R^N$ and in bounded
domains.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:01:19 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Felli",
"Veronica",
""
]
] | [
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] |
802.0579 | Brigitte Bidegaray-Fesquet | Brigitte Bid\'egaray-Fesquet (LJK) | Von Neumann Stability Analysis of Finite Difference Schemes for
Maxwell--Debye and Maxwell--Lorentz Equations | English translation of version 1 | null | null | 1077-M | math.NA | null | This technical report yields detailed calculations of the paper [1] (B.
Bid\'egaray-Fesquet, "Stability of FD-TD schemes for Maxwell-Debye and
Maxwell-Lorentz equations", Technical report, LMC-IMAG, 2005) which have been
however automated since (see
http://ljk.imag.fr/membres/Brigitte.Bidegaray/NAUtil/). It deals with the
stability analysis of various finite difference schemes for Maxwell--Debye and
Maxwell--Lorentz equations. This work gives a systematic and rigorous
continuation to Petropoulos previous work [5] (P.G. Petropoulos.,"Stability and
phase error analysis of FD-TD in dispersive dielectrics", IEEE Transactions on
Antennas and Propagation, 42(1):62--69, 1994).
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:11:49 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Bidégaray-Fesquet",
"Brigitte",
"",
"LJK"
]
] | [
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] |
802.058 | Frans Willems | Frans M.J. Willems | Rotated and Scaled Alamouti Coding | Submitted to ISIT 2008 | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Repetition-based retransmission is used in Alamouti-modulation [1998] for
$2\times 2$ MIMO systems. We propose to use instead of ordinary repetition
so-called "scaled repetition" together with rotation. It is shown that the
rotated and scaled Alamouti code has a hard-decision performance which is only
slightly worse than that of the Golden code [2005], the best known $2\times 2$
space-time code. Decoding the Golden code requires an exhaustive search over
all codewords, while our rotated and scaled Alamouti code can be decoded with
an acceptable complexity however.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:12:48 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Willems",
"Frans M. J.",
""
]
] | [
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] |
802.0581 | Alan Kostelecky | Alan Kostelecky | Perspectives on Lorentz and CPT Violation | 7 pages, presented at the Fourth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, August 2007 | null | null | IUHET 513, September 2007 | gr-qc astro-ph hep-ph | null | This talk offers some comments and perspectives on Lorentz and CPT violation.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:36:50 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Kostelecky",
"Alan",
""
]
] | [
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] |
802.0582 | Wei-Tou Ni | Thierry Appourchaux, Raymond Burston, Yanbei Chen, Michael Cruise,
Hansjoerg Dittus, Bernard Foulon, Patrick Gill, Laurent Gizon, Hugh Klein,
Sergei Klioner, Sergei Kopeikin, Hans Krueger, Claus Laemmerzahl, Alberto
Lobo, Xinlian Luo, Helen Margolis, Wei-Tou Ni, Antonio Pulido Paton, Qiuhe
Peng, Achim Peters, Ernst Rasel, Albrecht Ruediger, Etienne Samain, Hanns
Selig, Diana Shaul, Timothy Sumner, Stephan Theil, Pierre Touboul, Slava
Turyshev, Haitao Wang, Li Wang, Linqing Wen, Andreas Wicht, Ji Wu, Xiaomin
Zhang, Cheng Zhao | Astrodynamical Space Test of Relativity using Optical Devices I (ASTROD
I) - A class-M fundamental physics mission proposal for Cosmic Vision
2015-2025 | 26 pages, 11 figures, shortened from the original cosmic vision
proposal, submitted to Experimental Astronomy; this version, shortened to 25
pages, re-organized and added references, is accepted for publication in
Experimental Astronomy | Exper.Astron.23:491-527,2009 | 10.1007/s10686-008-9131-8 | null | astro-ph gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | ASTROD I is a planned interplanetary space mission with multiple goals. The
primary aims are: to test General Relativity with an improvement in sensitivity
of over 3 orders of magnitude, improving our understanding of gravity and
aiding the development of a new quantum gravity theory; to measure key solar
system parameters with increased accuracy, advancing solar physics and our
knowledge of the solar system and to measure the time rate of change of the
gravitational constant with an order of magnitude improvement and the anomalous
Pioneer acceleration, thereby probing dark matter and dark energy
gravitationally. It is an international project, with major contributions from
Europe and China and is envisaged as the first in a series of ASTROD missions.
ASTROD I will consist of one spacecraft carrying a telescope, four lasers, two
event timers and a clock. Two-way, two-wavelength laser pulse ranging will be
used between the spacecraft in a solar orbit and deep space laser stations on
Earth, to achieve the ASTROD I goals. A second mission, ASTROD II is envisaged
as a three-spacecraft mission which would test General Relativity to one part
per billion, enable detection of solar g-modes, measure the solar
Lense-Thirring effect to 10 parts per million, and probe gravitational waves at
frequencies below the LISA bandwidth. In the third phase (ASTROD III or
Super-ASTROD), larger orbits could be implemented to map the outer solar system
and to probe primordial gravitational-waves at frequencies below the ASTROD II
bandwidth.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:22:20 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Dec 2008 13:34:13 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Appourchaux",
"Thierry",
""
],
[
"Burston",
"Raymond",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Cruise",
"Michael",
""
],
[
"Dittus",
"Hansjoerg",
""
],
[
"Foulon",
"Bernard",
""
],
[
"Gill",
"Patrick",
""
],
[
"Gizon",
"Laurent",
""
],
[
"Klein",
"Hugh",
""
],
[
"Klioner",
"Sergei",
""
],
[
"Kopeikin",
"Sergei",
""
],
[
"Krueger",
"Hans",
""
],
[
"Laemmerzahl",
"Claus",
""
],
[
"Lobo",
"Alberto",
""
],
[
"Luo",
"Xinlian",
""
],
[
"Margolis",
"Helen",
""
],
[
"Ni",
"Wei-Tou",
""
],
[
"Paton",
"Antonio Pulido",
""
],
[
"Peng",
"Qiuhe",
""
],
[
"Peters",
"Achim",
""
],
[
"Rasel",
"Ernst",
""
],
[
"Ruediger",
"Albrecht",
""
],
[
"Samain",
"Etienne",
""
],
[
"Selig",
"Hanns",
""
],
[
"Shaul",
"Diana",
""
],
[
"Sumner",
"Timothy",
""
],
[
"Theil",
"Stephan",
""
],
[
"Touboul",
"Pierre",
""
],
[
"Turyshev",
"Slava",
""
],
[
"Wang",
"Haitao",
""
],
[
"Wang",
"Li",
""
],
[
"Wen",
"Linqing",
""
],
[
"Wicht",
"Andreas",
""
],
[
"Wu",
"Ji",
""
],
[
"Zhang",
"Xiaomin",
""
],
[
"Zhao",
"Cheng",
""
]
] | [
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] |
802.0583 | El Hassan Saidi | El Hassan Saidi | BPS and non BPS 7D Black Attractors in M-Theory on K3 | 83 pages, Typos corrected, References added | null | null | Lab/UFR-HEP-0802, GNPHE-0802 | hep-th | null | We study the BPS and non BPS black attractors in 7D N=2 supergravity embedded
in 11D M-theory compactified on K3. Combining Kahler and complex moduli in
terms of SO(3) representations, we build the Dalbeault like (DL) basis for the
second cohomology of K3 and set up the fundamental relations of the special
"hyperKahler" geometry of the underlying moduli space of the 7D theory. We
study the attractor eqs of the 7D black branes by using the method of the
criticality of the effective potential and also by using the extension of the
so called 4D new attractor approach to 7D N=2 supergravity. A comment,
regarding a 6D/7D correspondence, along the line of Ceresole-Ferrara-Marrani
used for 4D/5D, ref.arXiv:0707.0964, is made.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 12:29:44 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 08:29:26 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Saidi",
"El Hassan",
""
]
] | [
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802.0584 | Donghi Lee | Donghi Lee | On several problems about automorphisms of the free group of rank two | 30 pages | J. Algebra, vol.321 (2009), pp.167-193 | null | null | math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $F_n$ be a free group of rank $n$. In this paper we discuss three
algorithmic problems related to automorphisms of $F_2$.
A word $u$ of $F_n$ is called positive if $u$ does not have negative
exponents. A word $u$ in $F_n$ is called potentially positive if $\phi(u)$ is
positive for some automorphism $\phi$ of $F_n$. We prove that there is an
algorithm to decide whether or not a given word in $F_2$ is potentially
positive, which gives an affirmative solution to problem F34a in [1] for the
case of $F_2$.
Two elements $u$ and $v$ in $F_n$ are said to be boundedly translation
equivalent if the ratio of the cyclic lengths of $\phi(u)$ and $\phi(v)$ is
bounded away from 0 and from $\infty$ for every automorphism $\phi$ of $F_n$.
We provide an algorithm to determine whether or not two given elements of $F_2$
are boundedly translation equivalent, thus answering question F38c in the
online version of [1] for the case of $F_2$.
We further prove that there exists an algorithm to decide whether or not a
given finitely generated subgroup of $F_2$ is the fixed point group of some
automorphism of $F_2$, which settles problem F1b in [1] in the affirmative for
the case of $F_2$.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:37:13 GMT"
}
] | 2011-05-03T00:00:00 | [
[
"Lee",
"Donghi",
""
]
] | [
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] |
802.0585 | Utpal Manna | U. Manna, S.S. Sritharan, and P. Sundar | Large Deviations for the Stochastic Shell Model of Turbulence | 21 pages, submitted for publication | NoDEA Nonlinear Differential Equations Appl. 16 (2009), no. 4,
493-521 | 10.1007/s00030-009-0023-z | null | math.PR math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we first prove the existence and uniqueness of a strong solution
to stochastic GOY model of turbulence with a small multiplicative noise. Then
using the weak convergence approach, Laplace principle for so- lutions of the
stochastic GOY model is established in certain Polish space. Thus a
Wentzell-Freidlin type large deviation principle is established utilizing
certain results by Varadhan and Bryc.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 10:49:32 GMT"
}
] | 2010-12-07T00:00:00 | [
[
"Manna",
"U.",
""
],
[
"Sritharan",
"S. S.",
""
],
[
"Sundar",
"P.",
""
]
] | [
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-0.0174233764,
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] |
802.0586 | Mkhitaryan Vagharsh | V. V. Mkhitaryan and M. E. Raikh | Supergap anomalies in cotunneling between N-S and between S-S leads via
a small quantum dot | 11 pages, 7 figures | Phys. Rev. B 77, 195329 (2008) | 10.1103/PhysRevB.77.195329 | null | cond-mat.mes-hall cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cotunneling current through a resonant level coupled to either normal and
superconducting or to two superconducting leads is studied for the domain of
bias voltages, V, exceeding the superconducting gap, 2\Delta. Due to the
on-site repulsion in the resonant level, cotunneling of an electron is
accompanied by creation of a quasiparticle in a superconducting lead. Energy
conservation imposes a threshold for this inelastic transport channel:
V_c=3\Delta for N-S case and \tilde{V}_c=4\Delta for the S-S case. We
demonstrate that the behavior of current near the respective thresholds is
nonanalytic, namely, \delta I^{in}(V)\propto (V-V_c)^{3/2}\Theta(V-V_c) and
\delta I^{in}(V) \propto (V-\tilde{V}_c)\Theta(V-\tilde{V}_c). Stronger anomaly
for the S-S leads is the consequence of the enhanced density of states at the
edges of the gap. In addition, the enhanced density of states makes the
threshold anomalies for two-electron cotunneling processes in the
Coulomb-blockaded regions more pronounced than for the N-N leads.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 20:59:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mkhitaryan",
"V. V.",
""
],
[
"Raikh",
"M. E.",
""
]
] | [
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] |
802.0587 | Alain Lecavelier des Etangs | A. Vidal-Madjar, A. Lecavelier des Etangs, J.-M. Desert, G. E.
Ballester, R. Ferlet, G. Hebrard, M. Mayor | Exoplanet HD 209458b : Evaporation strengthened | To be published in ApJL | null | 10.1086/587036 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following re-analysis of Hubble Space Telescope observations of primary
transits of the extrasolar planet HD209458b at Lyman-alpha, Ben-Jaffel (2007,
BJ007) claims that no sign of evaporation is observed. Here we show that, in
fact, this new analysis is consistent with the one of Vidal-Madjar et al.
(2003, VM003) and supports the detection of evaporation. The apparent
disagreement is mainly due to the disparate wavelength ranges that are used to
derive the transit absorption depth. VM003 derives a (15+/-4)% absorption depth
during transit over the core of the stellar Lyman-alpha line (from -130 km/s to
+100 km/s), and this result agrees with the (8.9+/-2.1)% absorption depth
reported by BJ007 from a slightly expanded dataset but over a larger wavelength
range (+/-200 km/s). These measurements agree also with the (5+/-2)% absorption
reported by Vidal-Madjar et al. (2004) over the whole Lyman-alpha line from
independent, lower-resolution data. We show that stellar Lyman-alpha
variability is unlikely to significantly affect those detections. The HI atoms
must necessarily have velocities above the escape velocities and/or be outside
the Roche lobe, given the lobe shape and orientation. Absorption by HI in
HD209458b's atmosphere has thus been detected with different datasets, and now
with independent analyses. All these results strengthen the concept of
evaporating hot-Jupiters, as well as the modelization of this phenomenon.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:15:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Vidal-Madjar",
"A.",
""
],
[
"Etangs",
"A. Lecavelier des",
""
],
[
"Desert",
"J. -M.",
""
],
[
"Ballester",
"G. E.",
""
],
[
"Ferlet",
"R.",
""
],
[
"Hebrard",
"G.",
""
],
[
"Mayor",
"M.",
""
]
] | [
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] |
802.0588 | David Seery | David Seery, Karim A. Malik and David H. Lyth | Non-gaussianity of inflationary field perturbations from the field
equation | 16 pages, uses iopart.sty. v2: replaced with version accepted by
JCAP; minor changes of wording only. v3: supersedes version published by
journal; typo fixed in Eq. (20) and updated references. v4: sign errors in
Eqs. (32) and (38) corrected | JCAP 0803:014,2008 | 10.1088/1475-7516/2008/03/014 | null | astro-ph gr-qc hep-th | null | We calculate the tree-level bispectrum of the inflaton field perturbation
directly from the field equations, and construct the corresponding f_NL
parameter. Our results agree with previous ones derived from the Lagrangian. We
argue that quantum theory should only be used to calculate the correlators when
they first become classical a few Hubble times after horizon exit, the
classical evolution taking over thereafter.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 12:09:56 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 11:53:19 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Apr 2008 12:21:34 GMT"
},
{
"version": "v4",
"created": "Fri, 30 May 2008 09:17:21 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Seery",
"David",
""
],
[
"Malik",
"Karim A.",
""
],
[
"Lyth",
"David H.",
""
]
] | [
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] |
802.0589 | Ramazan Sever | Sameer M. Ikhdair and RAmazan Sever | Exact Quantization Rule to the Kratzer-Type Potentials: An Application
to the Diatomic Molecules | 26 pages | J. Math. Chem. 45, 1137(2009) | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For any arbitrary values of $n$ and $l$ quantum numbers, we present a simple
exact analytical solution of the $D$-dimensional ($D\geq 2$) hyperradial Schr%
\"{o}dinger equation with the Kratzer and the modified Kratzer potentials
within the framework of the exact quantization rule (EQR) method. The exact
energy levels $(E_{nl})$ of all the bound-states are easily calculated from
this EQR method. The corresponding normalized hyperradial wave functions $%
(\psi_{nl}(r))$ are also calculated. The exact energy eigenvalues for these
Kratzer-type potentials are calculated numerically for the typical diatomic
molecules $LiH,$ $CH,$ $HCl,$ $CO,$ $NO,$ $O_{2},$ $N_{2}$ and $I_{2}$ for
various values of $n$ and $l$ quantum numbers. Numerical tests using the energy
calculations for the interdimensional degeneracy ($D=2-4$) for $I_{2}, $ $LiH,$
$HCl,$ $O_{2},$ $NO$ and $CO$ are also given. Our results obtained by EQR are
in exact agreement with those obtained by other methods.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:26:46 GMT"
}
] | 2009-04-09T00:00:00 | [
[
"Ikhdair",
"Sameer M.",
""
],
[
"Sever",
"RAmazan",
""
]
] | [
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] |
802.059 | Jianxun Hu | Jianxun Hu and Yongbin Ruan | Positive divisors in symplectic geometry | null | null | null | null | math.SG math.AG | http://creativecommons.org/licenses/by/3.0/ | In this paper, we gave some explicit relations between absolute and relative
Gromov-Witten invariants. We proved that a symplectic manifold is symplectic
rationally connected if it contains a positive divisor symplectomorphic to
$P^n$.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:27:27 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Hu",
"Jianxun",
""
],
[
"Ruan",
"Yongbin",
""
]
] | [
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] |
802.0591 | Jaume Terradas | J. Terradas, I. Arregui, R. Oliver, J. L. Ballester, J. Andries and M.
Goossens | Resonant absorption in complicated plasma configurations: applications
to multi-stranded coronal loop oscillations | null | null | 10.1086/586733 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the excitation and damping of transverse oscillations in a
multi-stranded model of a straight line-tied coronal loop. The transverse
geometry of our equilibrium configuration is quite irregular and more realistic
than the usual cylindrical loop model. By numerically solving the
time-dependent ideal magnetohydrodynamic equations in two dimensions we show
how the global motion of the whole bundle of strands, excited by an external
disturbance, is converted into localized Alfv\'enic motions due to the process
of resonant absorption. This process produces the attenuation of the transverse
oscillations. At any location in the structure two dominant frequencies are
found, the frequency of the global mode, or quasi-mode, and the local Alfv\'en
frequency. We find that the mechanism of mode conversion, due to the coupling
between fast and Alfv\'en waves, is not compromised by the complicated geometry
of the model. We also show that it is possible to have energy conversion not
only at the external edge of the composite loop but also inside the structure.
The implications of these results and their relationship with the observations
are discussed.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:34:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Terradas",
"J.",
""
],
[
"Arregui",
"I.",
""
],
[
"Oliver",
"R.",
""
],
[
"Ballester",
"J. L.",
""
],
[
"Andries",
"J.",
""
],
[
"Goossens",
"M.",
""
]
] | [
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] |
802.0592 | Stephan De Bievre | P. Lafitte, P. E. Parris, S. De Bievre | Normal transport properties for a classical particle coupled to a
non-Ohmic bath | null | null | 10.1007/s10955-008-9590-3 | null | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Hamiltonian motion of an ensemble of unconfined classical
particles driven by an external field F through a translationally-invariant,
thermal array of monochromatic Einstein oscillators. The system does not
sustain a stationary state, because the oscillators cannot effectively absorb
the energy of high speed particles. We nonetheless show that the system has at
all positive temperatures a well-defined low-field mobility over macroscopic
time scales of order exp(-c/F). The mobility is independent of F at low fields,
and related to the zero-field diffusion constant D through the Einstein
relation. The system therefore exhibits normal transport even though the bath
obviously has a discrete frequency spectrum (it is simply monochromatic) and is
therefore highly non-Ohmic. Such features are usually associated with anomalous
transport properties.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:37:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lafitte",
"P.",
""
],
[
"Parris",
"P. E.",
""
],
[
"De Bievre",
"S.",
""
]
] | [
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] |
802.0593 | Alexander Razumov | Kh. S. Nirov and A. V. Razumov | Abelian Toda solitons revisited | minor corrections (mostly stylistic), version to appear in Rev. Math.
Phys | Rev.Math.Phys.20:1209-1248,2008 | 10.1142/S0129055X08003559 | null | math-ph hep-th math.MP nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic and detailed review of the application of the method
of Hirota and the rational dressing method to abelian Toda systems associated
with the untwisted loop groups of complex general linear groups. Emphasizing
the rational dressing method, we compare the soliton solutions constructed
within these two approaches, and show that the solutions obtained by the
Hirota's method are a subset of those obtained by the rational dressing method.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 16:20:45 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Oct 2008 10:51:46 GMT"
}
] | 2009-08-18T00:00:00 | [
[
"Nirov",
"Kh. S.",
""
],
[
"Razumov",
"A. V.",
""
]
] | [
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802.0594 | Izaskun Jimenez-Serra | I. Jimenez-Serra (1,2), P. Caselli (2,3), J. Martin-Pintado (1) and T.
W. Hartquist (2) ((1) DAMIR-IEM-CSIC, Spain, (2) University of Leeds, UK, (3)
INAF-Osservatorio Astrofisico di Arcetri, Italy) | Parametrization of C-shocks. Evolution of the Sputtering of Grains | 12 pages, 7 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20078054 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Context: The detection of narrow SiO lines toward the young shocks of the
L1448-mm outflow has been interpreted as a signature of the magnetic precursor
of C-shocks. In contrast with the low SiO abundances (<10E-12) in the ambient
gas, the narrow SiO emission at almost ambient velocities reveals enhanced SiO
abundances of 10E-11. This enhancement has been proposed to be produced by the
sputtering of the grain mantles at the first stages of C-shocks. However,
modelling of the sputtering of grains has usually averaged the SiO abundances
over the dissipation region of C-shocks, which cannot explain the recent
observations. Aims: To model the evolution of the gas phase abundances of SiO,
CH3OH and H2O, produced by the sputtering of grains as the shock propagates
through the ambient gas. Methods: We propose a parametric model to describe the
physical structure of C-shocks as a function of time. Using the known
sputtering yields for water mantles (with minor constituents like silicon and
CH3OH) and olivine cores by collisions with H2, He, C, O, Si, Fe and CO, we
follow the evolution of the abundances of silicon, CH3OH and H2O ejected from
grains. Results: The evolution of these abundances shows that CO seems to be
the most efficient sputtering agent in low velocity shocks. The velocity
threshold for the sputtering of silicon from the grain mantles is reduced by
5-10 km s-1 by CO compared to other models. The sputtering by CO can generate
SiO abundances of 10E-11 at the early stages of low velocity shocks, consistent
with those observed in the magnetic precursor of L1448-mm. Our model also
satisfactorily reproduce the progressive enhancement of SiO, CH3OH and H2O
observed in this outflow by the coexistence of two shocks with vs=30 and
60kms-1 within the same region.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:43:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jimenez-Serra",
"I.",
""
],
[
"Caselli",
"P.",
""
],
[
"Martin-Pintado",
"J.",
""
],
[
"Hartquist",
"T. W.",
""
]
] | [
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] |
802.0595 | I. L. Landau | I. L. Landau | Comparison of the scaling analysis of the mixed-state magnetization data
with direct measurements of the upper critical field in Y-123 | 3 pages, 1 figure | J. Phys.: Condens. Matter 20, 275229 (2008) . | 10.1088/0953-8984/20/27/275229 | null | cond-mat.supr-con | null | By comparison of recent direct measurements of the temperature dependence of
the upper critical field $H_{c2}$ in an Y-123 high temperature superconductor
with the scaling analysis of magnetization data, collected in fields H << H_c2,
we demonstrate that that the temperature dependence of the Ginzburg-Landau
parameter kappa is negligible. Another conclusion is that the normalized
temperature dependence of H_c2 is independent of the orientation of the
magnetic field in respect to crystallographic axes of the sample. We also
discuss that isotropy of the temperature dependence of H_c2 straightforwardly
follows from the Ginzburg-Landau theory if kappa does not depend on
temperature.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:52:08 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 20:01:21 GMT"
}
] | 2008-06-09T00:00:00 | [
[
"Landau",
"I. L.",
""
]
] | [
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802.0596 | Miriam Ciavarella | Miriam Ciavarella, Lea Terracini | Towards an analogue of Ihara's lemma for Shimura curves | null | null | null | null | math.NT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The object of this work is to present the status of art of an open problem:
to provide an analogue for Shimura curves of the Ihara's lemma \cite{Ihara73}
which holds for modular curves. We will describe our direct result towards the
"Problem of Ihara" and we will present some possible approaches to it, giving a
formulation of our conjecture in terms of congruence subgroup problem for
quaternion algebras.
Since some modular forms can be reinterpreted as elements of the cohomology
of Shimura curves, we will describe a consequence of the "Problem of Ihara"
about congruence modules of modular forms and a consequence of it about the
problem of raising the level of modular forms.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:52:34 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jan 2010 15:32:24 GMT"
}
] | 2010-01-04T00:00:00 | [
[
"Ciavarella",
"Miriam",
""
],
[
"Terracini",
"Lea",
""
]
] | [
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] |
802.0597 | Atif Aziz | A. Aziz, S. J. Bending, H. Robert, S. Crampin, P. J. Heard, and C. H.
Marrows | Investigation of artificial domains realised by local gallium focused
ion beam (FIB) modification of Pt/Co/Pt trilayer structures | null | J. Appl. Phys. 99, 08C504 (2006) | null | null | cond-mat.mtrl-sci cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of experimental investigations of magnetic switching
and magnetotransport in a new generation of magnetic devices containing
artificially patterned domains. Our devices are realised by locally reducing
the coercive field of a perpendicularly magnetised Pt (3.5 nm)/Co (0.5 nm)/Pt
(1.6 nm) trilayer structure using a gallium focused ion beam (FIB). Artificial
domain walls are created at the interfaces between dosed and undosed regions
when an external magnetic field switches the former but not the latter. We have
exploited this property to create stripe-like domains with widths down to
sub-micron lengthscales, separated by undosed regions. Using the extraordinary
Hall effect to monitor the local magnetisation we have investigated the
reversal dynamics of these artificial domains by measuring major and minor
hysteresis loops. The coercive field of regions irradiated with identical doses
systematically increases as their size decreases. In the lower branch of minor
loops, reversal is seen to occur via a few large Barkhausen events. Preliminary
measurements of transport across domain walls reveal a positive domain wall
resistance, that does not change sign from 4.2 K to 300 K.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 11:54:53 GMT"
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] | 2008-02-06T00:00:00 | [
[
"Aziz",
"A.",
""
],
[
"Bending",
"S. J.",
""
],
[
"Robert",
"H.",
""
],
[
"Crampin",
"S.",
""
],
[
"Heard",
"P. J.",
""
],
[
"Marrows",
"C. H.",
""
]
] | [
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802.0598 | Elijah Liflyand | Elijah Liflyand | Boundedness of multidimensional Hausdorff operators on $L^1$ and $H^1$
spaces | 5 pages | null | null | null | math.CA math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a wide family of multivariate Hausdorff operators, a new stronger
condition for the boundedness of an operator from this family on the real Hardy
space $H^1$ by means of atomic decomposition.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 12:05:39 GMT"
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] | 2008-02-06T00:00:00 | [
[
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802.0599 | Stepan Apunevych Dr. | S.Apunevych, B.Venhlovska, Yu.Kulinich, B.Novosyadlyj | WMAP2006: Cosmological Parameters and Large-scale Structure of the
Universe | 12 pages, 6 figures, translation from Ukrainian | Kinematika i Fizika Nebesnykh Tel (in Ukrainian), V23, N2 (2007) | null | null | astro-ph | null | The parameters of cosmological model with cold dark matter and cosmological
constant (Lambda CDM) have been determined on a basis of three-year cosmic
microwave background observations by space mission WMAP, as well as the data on
the large-scale structure of the Universe. The data cover scales from 1 up to
10000 Mpc. The best-fit values of LambdaCDM model parameters were found by
minimization of chi^2 using the Levenberg-Markquardt approach
(Omega_Lambda=0.736+-0.065, Omega_m=0.238+-0.080, Omega_b=0.05+-0.011, h=0.68+-
0.09, sigma_8=0.73+-0.08 and n_s=0.96+-0.015). It is shown that the LambdaCDM
model with these values of the parameters agrees well with the angular power
spectrum of cosmic microwave background and with power spectra of the density
perturbations, estimated from spatial distributions of galaxies, rich galaxy
clusters and from statistics of Ly_alpha absorption lines in spectra of distant
quasars as well. The accordance of modeled characteristics of the large-scale
structure with observable ones was analyzed, and possible reasons of
significant discrepancies between some of them were considered.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 12:16:17 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Apunevych",
"S.",
""
],
[
"Venhlovska",
"B.",
""
],
[
"Kulinich",
"Yu.",
""
],
[
"Novosyadlyj",
"B.",
""
]
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] |
802.06 | Claudio Pisani | Claudio Pisani | Balanced category theory | 32 pages, corrected typos and minor changes | null | null | null | math.CT | null | Some aspects of basic category theory are developed in a finitely complete
category $\C$, endowed with two factorization systems which determine the same
discrete objects and are linked by a simple reciprocal stability law. Resting
on this axiomatization of final and initial functors and discrete
(op)fibrations, concepts such as components, slices and coslices, colimits and
limits, left and right adjunctible maps, dense maps and arrow intervals, can be
naturally defined in $\C$, and several classical properties concerning them can
be effectively proved.
For any object $X$ of $\C$, by restricting $\C/X$ to the slices or to the
coslices of $X$, two dual "underlying categories" are obtained. These can be
enriched over internal sets (discrete objects) of $\C$: internal hom-sets are
given by the components of the pullback of the corresponding slice and coslice
of $X$. The construction extends to give functors $\C\to\Cat$, which preserve
(or reverse) slices and adjunctible maps and which can be enriched over
internal sets too.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 12:07:41 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 20:35:16 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Pisani",
"Claudio",
""
]
] | [
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802.0601 | Attila Grandpierre | Attila Grandpierre | Biological Extension of the Action Principle: Endpoint Determination
beyond the Quantum Level and the Ultimate Physical Roots of Consciousness | 28 pages | NeuroQuantology, 2007, Vol. 5, pp. 346-362 | null | null | physics.gen-ph | null | We show that when we endow the action principle with the overlooked
possibility to allow endpoint selection, it gains an enormous additional power,
which, perhaps surprisingly, directly corresponds to biological behavior. The
biological version of the least action principle is the most action principle.
For the first time, we formulate here the first principle of biology in a
mathematical form and present some of its applications of primary importance.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 12:25:38 GMT"
}
] | 2008-02-07T00:00:00 | [
[
"Grandpierre",
"Attila",
""
]
] | [
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] |
802.0602 | Manuel Perucho Pla | M. Perucho, A.P. Lobanov, Y.Y. Kovalev | Physical information derived from the internal structure in jets | 4 pages. To be published in the proceedings of Approaching
Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technology. Eds.
Y.Hagiwara, E.Fomalont, M.Tsuboi, and Y.Murata | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first results on the analysis of the structures observed in
the jet of the quasar 0836+710. We obtain the ridge lines of the jet at
different epochs and several frequencies. We interpret the oscillatory
structures obtained as waves that can be attached to the growth of
instabilities. We explain how to derive information on the nature and origin of
these structures by fitting together the ridge lines at different epochs and
frequencies. Finally we show the predictive power of this approach: by
generating an artificial wave and applying the corresponding relativistic and
projection effects we show that apparent changes in the jet direction in the
inner regions of jets can be attached to the transversal motion of structures.
| [
{
"version": "v1",
"created": "Tue, 5 Feb 2008 12:12:40 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Perucho",
"M.",
""
],
[
"Lobanov",
"A. P.",
""
],
[
"Kovalev",
"Y. Y.",
""
]
] | [
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