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802.1403 | Andrea Chiavassa Mr | A. Chiavassa, B. Plez, E. Josselin, B. Freytag | Atmospheric dynamics of red supergiant stars and applications to
Interferometry | 6 pages, SF2A 2007 conference | null | null | null | astro-ph | null | We have written a 3D radiative transfer code that computes emerging spectra
and intensity maps. We derive from radiative hydrodynamic (RHD) simulations of
RSG stars carried out with CO5BOLD (Freytag et al. 2002) observables expected
for red supergiant stars (RSG) especially for interferometric observations,
with emphasis on small scale structures. We show that the convection-related
surface structures are detectable in the H band with today's interferometers
and that the diameter measurement should not be too dependent on the adopted
model. The simulations are a great improvement over parametric models for the
interpretation of interferometric observations.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 10:41:06 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Chiavassa",
"A.",
""
],
[
"Plez",
"B.",
""
],
[
"Josselin",
"E.",
""
],
[
"Freytag",
"B.",
""
]
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802.1404 | Evgeni Kolomeitsev | E.E. Kolomeitsev (1 and 2), D.N. Voskresensky (1 and 3) ((1) GSI,
Darmstadt, (2) UMN, Minneapolis, (3) MEPhI, Moscow) | Neutrino emission due to Cooper-pair recombination in neutron stars
revisited | 12 pages, 1 figure | Phys.Rev.C77:065808,2008 | 10.1103/PhysRevC.77.065808 | null | nucl-th astro-ph cond-mat.supr-con | null | Neutrino emission in processes of breaking and formation of neutron and
proton Cooper pairs is calculated within the Larkin-Migdal-Leggett approach for
a superfluid Fermi liquid. We demonstrate explicitly that the Fermi-liquid
renormalization respects the Ward identity and assures the weak vector current
conservation. The systematic expansion of the emissivities for small
temperatures and nucleon Fermi velocity, v_{F,i}, i=n,p, is performed. Both
neutron and proton processes are mainly controlled by the axial-vector current
contributions, which are not strongly changed in the superfluid matter. Thus,
compared to earlier calculations the total emissivity of processes on neutrons
paired in the 1S_0 state is suppressed by a factor ~(0.9-1.2) v_{F,n}^2. A
similar suppression factor (~v_{F,p}^2) arises for processes on protons.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 10:45:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kolomeitsev",
"E. E.",
"",
"1 and 2"
],
[
"Voskresensky",
"D. N.",
"",
"1 and 3"
]
] | [
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802.1405 | Stefan Dittmaier | Stefan Dittmaier, Alois Kabelschacht and Tobias Kasprzik | Polarized QED splittings of massive fermions and dipole subtraction for
non-collinear-safe observables | 44 pages, latex | Nucl.Phys.B800:146-189,2008 | 10.1016/j.nuclphysb.2008.03.010 | MPP-2008-4 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building on earlier work, the dipole subtraction formalism for photonic
corrections is extended to various photon--fermion splittings where the
resulting collinear singularities lead to corrections that are enhanced by
logarithms of small fermion masses. The difference to the earlier treatment of
photon radiation is that now no cancellation of final-state singularities is
assumed, i.e. we allow for non-collinear-safe final-state radiation. Moreover,
we consider collinear fermion production from incoming photons,
forward-scattering of incoming fermions, and collinearly produced
fermion-antifermion pairs. For all cases we also provide the corresponding
formulas for the phase-space slicing approach, and particle polarization is
supported for all relevant situations. A comparison of numerical results
obtained with the proposed subtraction procedure and the slicing method is
explicitly performed for the sample process e- gamma -> e- mu- mu+.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 10:46:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dittmaier",
"Stefan",
""
],
[
"Kabelschacht",
"Alois",
""
],
[
"Kasprzik",
"Tobias",
""
]
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] |
802.1406 | Etienne Roquain | Gilles Blanchard (FIRST.IDA), Etienne Roquain (LPMA) | Two simple sufficient conditions for FDR control | Published in at http://dx.doi.org/10.1214/08-EJS180 the Electronic
Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Electronic Journal of Statistics 2 (2008) 963-992 | 10.1214/08-EJS180 | null | math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the control of the false discovery rate (FDR) for a multiple
testing procedure is implied by two coupled simple sufficient conditions. The
first one, which we call ``self-consistency condition'', concerns the algorithm
itself, and the second, called ``dependency control condition'' is related to
the dependency assumptions on the $p$-value family. Many standard multiple
testing procedures are self-consistent (e.g. step-up, step-down or step-up-down
procedures), and we prove that the dependency control condition can be
fulfilled when choosing correspondingly appropriate rejection functions, in
three classical types of dependency: independence, positive dependency (PRDS)
and unspecified dependency. As a consequence, we recover earlier results
through simple and unifying proofs while extending their scope to several
regards: weighted FDR, $p$-value reweighting, new family of step-up procedures
under unspecified $p$-value dependency and adaptive step-up procedures. We give
additional examples of other possible applications. This framework also allows
for defining and studying FDR control for multiple testing procedures over a
continuous, uncountable space of hypotheses.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 10:54:30 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Oct 2008 18:12:51 GMT"
}
] | 2008-10-21T00:00:00 | [
[
"Blanchard",
"Gilles",
"",
"FIRST.IDA"
],
[
"Roquain",
"Etienne",
"",
"LPMA"
]
] | [
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] |
802.1407 | Vincent Leijdekker | Vincent Leijdekker and Peter Spreij | Explicit Computations for a Filtering Problem with Point Process
Observations with Applications to Credit Risk | null | null | null | null | q-fin.CP math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the intensity-based approach for the modeling of default times of
one or more companies. In this approach the default times are defined as the
jump times of a Cox process, which is a Poisson process conditional on the
realization of its intensity. We assume that the intensity follows the
Cox-Ingersoll-Ross model. This model allows one to calculate survival
probabilities and prices of defaultable bonds explicitly. In this paper we
assume that the Brownian motion, that drives the intensity, is not observed.
Using filtering theory for point process observations, we are able to derive
dynamics for the intensity and its moment generating function, given the
observations of the Cox process. A transformation of the dynamics of the
conditional moment generating function allows us to solve the filtering
problem, between the jumps of the Cox process, as well as at the jumps.
Assuming that the initial distribution of the intensity is of the Gamma type,
we obtain an explicit solution to the filtering problem for all t>0. We
conclude the paper with the observation that the resulting conditional moment
generating function at time t corresponds to a mixture of Gamma distributions.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 10:56:31 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Leijdekker",
"Vincent",
""
],
[
"Spreij",
"Peter",
""
]
] | [
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] |
802.1408 | Jeremie Guilhot | Jeremie Guilhot | Generalized induction of Kazhdan-Lusztig cells | 21 pages, 3 figures | null | null | null | math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following Lusztig, we consider a Coxeter group $W$ together with a weight
function. Geck showed that the Kazhdan-Lusztig cells of $W$ are compatible with
parabolic subgroups. In this paper, we generalize this argument to some subsets
of $W$ which may not be parabolic subgroups. We obtain two applications: we
show that under specific technical conditions on the parameters, the cells of a
certain finite parabolic subgroup of $W$ are cells in the whole group, and we
decompose the affine Weyl group $\tilde{G}_{2}$ into left and two-sided cells
for a whole class of weight functions.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:07:11 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Mar 2008 17:47:45 GMT"
},
{
"version": "v3",
"created": "Tue, 28 Oct 2008 23:39:05 GMT"
}
] | 2008-10-29T00:00:00 | [
[
"Guilhot",
"Jeremie",
""
]
] | [
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] |
802.1409 | Misha Katsnelson | M. I. Katsnelson and M. F. Prokhorova | Zero-energy states in corrugated bilayer graphene | minor changes (misprints are fixed, a bit more explanations in the
mathematical part are added) | Phys. Rev. B 77, 205424 (2008) | 10.1103/PhysRevB.77.205424 | null | cond-mat.mes-hall | null | Anomalous quantum Hall effects in single-layer and bilayer graphene are
related with nontrivial topological properties of electron states (Berry phases
$\pi$ and 2$\pi$, respectively). It was known that the Atiyah-Singer index
theorem guarantees, for the case of the single-layer, existence of zero-energy
states for the case of inhomogeneous magnetic fields assuming that the total
flux is non-zero. This leads, in particular, to appearance of midgap states in
corrugated graphene and topologically protects zero-energy Landau level in
corrugated single-layer graphene. Here we apply this theorem to the case of
bilayer graphene and prove the existence of zero-energy modes for this case.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 13:38:28 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 16:42:07 GMT"
}
] | 2008-09-17T00:00:00 | [
[
"Katsnelson",
"M. I.",
""
],
[
"Prokhorova",
"M. F.",
""
]
] | [
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] |
802.141 | Massimiliano Grazzini | S.Catani, M.Grazzini | HNNLO: a Monte Carlo program to compute Higgs boson production at hadron
colliders | 6 pages, to appear in the proceedings of the 8th International
Symposium on Radiative Corrections, RADCOR 2007, Florence, Italy | PoSRADCOR2007:046,2007 | null | null | hep-ph | null | We consider Higgs boson production through gluon--gluon fusion in hadron
collisions. We present a numerical program that computes the cross section up
to NNLO in QCD perturbation theory. The program includes the decay modes
H->gamma-gamma, H->WW->lnulnu, H->ZZ->4leptons, and allows the user to apply
arbitrary cuts on the momenta of the partons and of the photons or leptons that
are produced in the final state.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:20:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Catani",
"S.",
""
],
[
"Grazzini",
"M.",
""
]
] | [
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] |
802.1411 | Yuji Hasegawa | S. Sponar, J. Klepp, G. Badurek and Y. Hasegawa | Zero-field and Larmor spinor precessions in a neutron polarimeter
experiment | 12 pages, 4 figures | null | 10.1016/j.physleta.2008.01.070 | null | quant-ph | http://creativecommons.org/licenses/by/3.0/ | We present a neutron polarimetric experiment where two kinds of spinor
precessions are observed: one is induced by different total energy of neutrons
(zero-field precession) and the other is induced by a stationary guide field
(Larmor precession). A characteristic of the former is the dependence of the
energy-difference, which is in practice tuned by the frequency of the
interacting oscillating magnetic field. In contrast the latter completely
depends on the strength of the guide field, namely Larmor frequency. Our
neutron-polarimetric experiment exhibits individual tuning as well as specific
properties of each spinor precession, which assures the use of both spin
precessions for multi-entangled spinor manipulation.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:10:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sponar",
"S.",
""
],
[
"Klepp",
"J.",
""
],
[
"Badurek",
"G.",
""
],
[
"Hasegawa",
"Y.",
""
]
] | [
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] |
802.1412 | Mahesh Pal Dr. | Mahesh Pal | Extreme Learning Machine for land cover classification | 6 pages, mapindia 2008 conference | null | 10.1080/01431160902788636 | null | cs.NE cs.CV | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores the potential of extreme learning machine based
supervised classification algorithm for land cover classification. In
comparison to a backpropagation neural network, which requires setting of
several user-defined parameters and may produce local minima, extreme learning
machine require setting of one parameter and produce a unique solution. ETM+
multispectral data set (England) was used to judge the suitability of extreme
learning machine for remote sensing classifications. A back propagation neural
network was used to compare its performance in term of classification accuracy
and computational cost. Results suggest that the extreme learning machine
perform equally well to back propagation neural network in term of
classification accuracy with this data set. The computational cost using
extreme learning machine is very small in comparison to back propagation neural
network.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:12:06 GMT"
}
] | 2019-07-02T00:00:00 | [
[
"Pal",
"Mahesh",
""
]
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802.1413 | Mikolaj Misiak | Bohdan Grzadkowski and Mikolaj Misiak | Anomalous Wtb coupling effects in the weak radiative B-meson decay | 5 pages, 2 figures. The arXiv version remains extended w.r.t. the
journal version. The first function in Eq. (12) has been corrected in v3,
implying slight changes in the numerical results. Conclusions remain
unaffected | Phys.rev.D78:077501,2008 | 10.1103/PhysRevD.78.077501 | IFT-2/2008 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of anomalous Wtb couplings on the B -> Xs gamma branching
ratio. The considered couplings are introduced as parts of gauge-invariant
dimension-six operators that are built out of the Standard Model fields only.
One-loop contributions from the charged-current vertices are assumed to be of
the same order as the tree-level flavour-changing neutral current ones. Bounds
on the corresponding Wilson coefficients are derived.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:26:46 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Sep 2008 13:01:09 GMT"
},
{
"version": "v3",
"created": "Tue, 13 Sep 2011 20:12:51 GMT"
}
] | 2011-09-15T00:00:00 | [
[
"Grzadkowski",
"Bohdan",
""
],
[
"Misiak",
"Mikolaj",
""
]
] | [
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] |
802.1414 | Konstantin Pankrashkin | Bernard Helffer, Konstantin Pankrashkin | Semiclassical reduction for magnetic Schroedinger operator with periodic
zero-range potentials and applications | 31 pages, minor revision (typos corrected, references updated),
accepted in Asymptotic Analysis | Asymptotic Analysis 63 (2009) 1-27 | 10.3233/ASY-2008-0923 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-dimensional Schroedinger operator with a uniform magnetic field and a
periodic zero-range potential is considered. For weak magnetic fields we reduce
the spectral problem to the semiclassical analysis of one-dimensional
Harper-like operators. This shows the existence of parts of Cantor structure in
the spectrum for special values of the magnetic flux.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:27:50 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Sep 2008 21:18:06 GMT"
}
] | 2009-05-24T00:00:00 | [
[
"Helffer",
"Bernard",
""
],
[
"Pankrashkin",
"Konstantin",
""
]
] | [
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] |
802.1415 | Jaiyeola Temitope Gbolahan | Temitope Gbolahan Jaiyeola | An holomorphic study of Smarandache automorphic and cross inverse
ploperty loops | 9 pages | Proceedings of the 4th International Conference on Number Theory
and Smarandache Problems, Scientia Magna Journal. Vol. 4, No. 1(2008),
102-108 | null | null | math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By studying the holomorphic structure of automorphic inverse property
quasigroups and loops[AIPQ and (AIPL)] and cross inverse property quasigroups
and loops[CIPQ and (CIPL)], it is established that the holomorph of a loop is a
Smarandache; AIPL, CIPL, K-loop, Bruck-loop or Kikkawa-loop if and only if its
Smarandache automorphism group is trivial and the loop is itself is a
Smarandache; AIPL, CIPL, K-loop, Bruck-loop or Kikkawa-loop.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:29:25 GMT"
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"created": "Mon, 5 May 2008 18:59:00 GMT"
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{
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"created": "Thu, 5 Jun 2008 09:09:34 GMT"
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] | 2008-06-05T00:00:00 | [
[
"Jaiyeola",
"Temitope Gbolahan",
""
]
] | [
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] |
802.1416 | Didier Sornette | G. Daniel and D. Sornette | Econophysics: historical perspectives | 7 pages | null | null | null | q-fin.GN physics.hist-ph physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Econophysics embodies the recent upsurge of interest by physicists into
financial economics, driven by the availability of large amount of data, job
shortage in physics and the possibility of applying many-body techniques
developed in statistical and theoretical physics to the understanding of the
self-organizing economy. This brief historical survey emphasizes that
Econophysics has many historical precursors, and is in fact rooted in a
continuous cross-fertilization between economics and physics that has been
active in the last centuries.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:32:57 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Daniel",
"G.",
""
],
[
"Sornette",
"D.",
""
]
] | [
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] |
802.1417 | Jaiyeola Temitope Gbolahan | Temitope Gbolahan Jaiyeola | A Double Cryptography Using The Smarandache Keedwell Cross Inverse
Quasigroup | 7 pages | International Journal of Mathematical Combinatorics, Vol. 3
(2008), 28-33. | null | null | math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present study further strengthens the use of the Keedwell CIPQ against
attack on a system by the use of the Smarandache Keedwell CIPQ for cryptography
in a similar spirit in which the cross inverse property has been used by
Keedwell. This is done as follows. By constructing two S-isotopic
S-quasigroups(loops) $U$ and $V$ such that their Smarandache automorphism
groups are not trivial, it is shown that $U$ is a SCIPQ(SCIPL) if and only if
$V$ is a SCIPQ(SCIPL). Explanations and procedures are given on how these
SCIPQs can be used to double encrypt information.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:35:12 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Jun 2008 09:13:34 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Mar 2009 16:59:01 GMT"
}
] | 2010-03-04T00:00:00 | [
[
"Jaiyeola",
"Temitope Gbolahan",
""
]
] | [
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802.1418 | Anne-Marie Broomhall | A.M. Broomhall (1), W.J. Chaplin (1), Y. Elsworth (1), S.T. Fletcher
(2) ((1) University of Birmingham, UK, (2) Sheffield Hallam University, UK) | The visibility of low-frequency solar acoustic modes | 9 pages, 6 figures, accepted for publication in Astronomische
Nachrichten | null | 10.1002/asna.200710988 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make predictions of the detectability of low-frequency p modes. Estimates
of the powers and damping times of these low-frequency modes are found by
extrapolating the observed powers and widths of higher-frequency modes with
large observed signal-to-noise ratios. The extrapolations predict that the
low-frequency modes will have small signal-to-noise ratios and narrow widths in
a frequency-power spectrum. Monte Carlo simulations were then performed where
timeseries containing mode signals and normally distributed Gaussian noise were
produced. The mode signals were simulated to have the powers and damping times
predicted by the extrapolations. Various statistical tests were then performed
on the frequency-amplitude spectra formed from these timeseries to investigate
the fraction of spectra in which the modes could be detected. The results of
these simulations were then compared to the number of p-modes candidates
observed in real Sun-as-a-star data at low frequencies. The fraction of
simulated spectra in which modes were detected decreases rapidly as the
frequency of modes decreases and so the fraction of simulations in which the
low-frequency modes were detected was very small. However, increasing the
signal-to-noise (S/N) ratio of the low-frequency modes by a factor of 2 above
the extrapolated values led to significantly more detections. Therefore efforts
should continue to further improve the quality of solar data that is currently
available.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:40:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Broomhall",
"A. M.",
"",
"University of Birmingham, UK"
],
[
"Chaplin",
"W. J.",
"",
"University of Birmingham, UK"
],
[
"Elsworth",
"Y.",
"",
"University of Birmingham, UK"
],
[
"Fletcher",
"S. T.",
"",
"Sheffield Hallam University, UK"
]
] | [
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802.1419 | H. O. Girotti | F. S. Bemfica and H. O. Girotti | Born series and unitarity in noncommutative quantum mechanics | 9 pages | Phys. Rev D 77, 027704 (2008) | 10.1103/PhysRevD.77.027704 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is dedicated to present model independent results for
noncommutative quantum mechanics. We determine sufficient conditions for the
convergence of the Born series and, in the sequel, unitarity is proved in full
generality.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:41:37 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Bemfica",
"F. S.",
""
],
[
"Girotti",
"H. O.",
""
]
] | [
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] |
802.142 | Nam Nhat Hoang | Nam Nhat Hoang, Thu Hang Nguyen, and Chau Nguyen | Ab initio study of the optical phonons in 1D antiferromagnet Ca2CuO3 | 14 pages, 4 figures | null | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the spin 1/2 antiferromagnetic Ca2CuO3 the optical excitation along 1D a
Cu-O chain showed the enrichment of forbidden peaks that could not be explained
by the group theory. We present the cluster-model ab initio study of these
optical phonons based on the Hartree-Fock SCF calculation with the 3-21G basic
set. The obtained results showed very good agreement with the observed data.
The Cu-O resonances generally showed the lower shifts in Ca2CuO3 than in pure
CuO and were primarily composed of the vibrations of the oxygen in static host
lattice whereas the Cu movements happened only in the collective lattice
vibrations. Almost complete classification of the forbidden phonons is
presented.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:43:43 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Hoang",
"Nam Nhat",
""
],
[
"Nguyen",
"Thu Hang",
""
],
[
"Nguyen",
"Chau",
""
]
] | [
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802.1421 | Tom Mestdag | M. Crampin and T. Mestdag | Relative equilibria of Lagrangian systems with symmetry | 16 pages, to appear in J. Geom. Phys | J. Geom. Phys. 58 (2008) 874--887. | 10.1016/j.geomphys.2008.02.008 | null | math.DG math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the characterization of relative equilibria of Lagrangian systems
with symmetry.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:08:00 GMT"
}
] | 2008-06-09T00:00:00 | [
[
"Crampin",
"M.",
""
],
[
"Mestdag",
"T.",
""
]
] | [
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802.1422 | Emir Haleva | Emir Haleva and Haim Diamant | Critical swelling of particle-encapsulating vesicles | 4 pages, 1 figure | Phys. Rev. Lett. 101, 078104 (2008) | 10.1103/PhysRevLett.101.078104 | null | cond-mat.soft cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a ubiquitous scenario where a fluctuating, semipermeable vesicle
is embedded in solution while enclosing a fixed number of solute particles. The
swelling with increasing number of particles or decreasing concentration of the
outer solution exhibits a continuous phase transition from a fluctuating state
to the maximum-volume configuration, whereupon appreciable pressure difference
and surface tension build up. This criticality is unique to
particle-encapsulating vesicles, whose volume and inner pressure both
fluctuate. It implies a universal swelling behavior of such vesicles as they
approach their limiting volume and osmotic lysis.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:59:28 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Aug 2008 08:49:36 GMT"
}
] | 2008-08-16T00:00:00 | [
[
"Haleva",
"Emir",
""
],
[
"Diamant",
"Haim",
""
]
] | [
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-0.0768887401,
-0.0073033809,
0.0215692315,
-0.0309180841,
0.0928853676,
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0.0258437414,
0.0648256987,
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] |
802.1423 | Nam Nhat Hoang | Nam Nhat Hoang, Dang Chinh Huynh, Duc Tho Nguyen, Thuy Trang Nguyen,
Duc The Ngo, Michael Finnie, and Chau Nguyen | Synthesis and structural characterization of uranium-doped Ca2CuO3, a 1D
quantum antiferromagnet | 32 pages, 10 figures | null | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The technological settings of a modified sol-gel method for preparation of
highly fine homogeneous powder Ca2CuO3 doped with uranium 238 (x=0-0.05) is
presented. The analysis of structure, purity of phases and the justification
for the role of uranium in the given compounds are provided together with
almost complete classification of observed optical phonons by means of the
Raman, IR measurements and ab initio calculation. The significant reduction in
particle size was achieved by doping and the strong correlation between
resistivity and doping concentration was observed and explained using the
phonon-assisted electron hopping conduction model. The persistence of covalent
insulation state in all compounds is a key feature of this class of compounds.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:51:36 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Apr 2008 05:42:35 GMT"
}
] | 2008-04-30T00:00:00 | [
[
"Hoang",
"Nam Nhat",
""
],
[
"Huynh",
"Dang Chinh",
""
],
[
"Nguyen",
"Duc Tho",
""
],
[
"Nguyen",
"Thuy Trang",
""
],
[
"Ngo",
"Duc The",
""
],
[
"Finnie",
"Michael",
""
],
[
"Nguyen",
"Chau",
""
]
] | [
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] |
802.1424 | Loredana Spezzi | Juan M.Alcala', Loredana Spezzi, Nicholas Chapman, Neal J. Evans II,
Tracy L. Huard, Jes K. Jorgens, Bruno Merin, Karl R. Stapelfel, Elvira
Covino, Antonio Frasca, Davide Gandolfi, Isa Oliveira | The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds.X. The
Chamaeleon II Pre-Main Sequence Population as Observed With IRAC and MIPS | 80 pages, 24 figures | null | 10.1086/527315 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the results from the combined IRAC and MIPS c2d Spitzer Legacy
survey observations and complementary optical and near infrared data of the
Chamaeleon II (Cha II) dark cloud. We perform a census of the young population
of Cha II, in a mapped area of ~1.75 square degrees, and study the spatial
distribution and properties of the cloud members and candidate pre-main
sequence (PMS) objects and their circumstellar matter. From the analysis of the
volume density of the PMS objects and candidates we find two tight groups of
objects with volume densities higher than 25 solar masses per cubic parsec and
5-10 members each. These groups correlate well in space with the regions of
high extinction. A multiplicity fraction of about 13% is observed for objects
with separations between 0.8" and 6.0". Using the results of masses and ages
from a companion paper, we estimate the star formation efficiency to be 1-4%
significantly lower than for Cha I. This might mean that different
star-formation activities in the Chamaeleon clouds reflect a different history
of star formation. We also find that the Cha II cloud is turning some 6-7 solar
masses into stars every Myr, which is low in comparison with the star formation
rate in other c2d clouds. On the other hand, the disk fraction of 70-80% that
we estimate in Cha II is much higher than in other star forming regions and
indicates that the population in this cloud is dominated by objects with active
accretion. Finally, the Cha II outflows are discussed, with particular regard
to the discovery of a new Herbig-Haro outflow, HH 939, driven by the classical
T Tauri star Sz 50.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:59:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alcala'",
"Juan M.",
""
],
[
"Spezzi",
"Loredana",
""
],
[
"Chapman",
"Nicholas",
""
],
[
"Evans",
"Neal J.",
"II"
],
[
"Huard",
"Tracy L.",
""
],
[
"Jorgens",
"Jes K.",
""
],
[
"Merin",
"Bruno",
""
],
[
"Stapelfel",
"Karl R.",
""
],
[
"Covino",
"Elvira",
""
],
[
"Frasca",
"Antonio",
""
],
[
"Gandolfi",
"Davide",
""
],
[
"Oliveira",
"Isa",
""
]
] | [
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] |
802.1425 | Kanat Abdukhalikov | Kanat Abdukhalikov, Eiichi Bannai, Sho Suda | Association schemes related to universally optimal configurations,
Kerdock codes and extremal Euclidean line-sets | 16 pages | Journal of Combinatorial Theory, Series A 116 (2009), 434-448 | 10.1016/j.jcta.2008.07.002 | null | math.CO math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | H. Cohn et. al. proposed an association scheme of 64 points in R^{14} which
is conjectured to be a universally optimal code. We show that this scheme has a
generalization in terms of Kerdock codes, as well as in terms of maximal real
mutually unbiased bases. These schemes also related to extremal line-sets in
Euclidean spaces and Barnes-Wall lattices. D. de Caen and E. R. van Dam
constructed two infinite series of formally dual 3-class association schemes.
We explain this formal duality by constructing two dual abelian schemes related
to quaternary linear Kerdock and Preparata codes.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 12:15:41 GMT"
}
] | 2014-03-25T00:00:00 | [
[
"Abdukhalikov",
"Kanat",
""
],
[
"Bannai",
"Eiichi",
""
],
[
"Suda",
"Sho",
""
]
] | [
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] |
802.1426 | Bakhrom Omirov Abdazovich | S. Albeverio, Sh. A. Ayupov, B. A. Omirov and R. M. Turdibaev | Cartan Subalgebras of Leibniz $n$-Algebras | 20 pages, submitted to Communications in Algebra | null | null | null | math.RA math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper is devoted to the investigation of properties of Cartan
subalgebras and regular elements in Leibniz $n$-algebras. The relationship
between Cartan subalgebras and regular elements of given Leibniz $n$-algebra
and Cartan subalgebras and regular elements of the corresponding factor $n$-Lie
algebra is established.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 12:17:35 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Albeverio",
"S.",
""
],
[
"Ayupov",
"Sh. A.",
""
],
[
"Omirov",
"B. A.",
""
],
[
"Turdibaev",
"R. M.",
""
]
] | [
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802.1427 | Klim Efremenko | Klim Efremenko, Ely Porat | Approximating General Metric Distances Between a Pattern and a Text | This is updated version of paper appered in SODA 2008 | SODA 2008 | null | null | cs.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $T=t_0 ... t_{n-1}$ be a text and $P = p_0 ... p_{m-1}$ a pattern taken
from some finite alphabet set $\Sigma$, and let $\dist$ be a metric on
$\Sigma$. We consider the problem of calculating the sum of distances between
the symbols of $P$ and the symbols of substrings of $T$ of length $m$ for all
possible offsets. We present an $\epsilon$-approximation algorithm for this
problem which runs in time $O(\frac{1}{\epsilon^2}n\cdot
\mathrm{polylog}(n,\abs{\Sigma}))$
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 12:36:31 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Efremenko",
"Klim",
""
],
[
"Porat",
"Ely",
""
]
] | [
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] |
802.1428 | Jaiyeola Temitope Gbolahan | Temitope Gbolahan Jaiyeola, John Olusola Adeniran | A Double Cryptography Using The Keedwell Cross Inverse Quasigroup | 8 pages, submitted for publication | null | null | null | math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present study further strenghtens the use of the Keedwell CIPQ against
attack on a system. This is done as follows. The holomorphic structure of
AIPQs(AIPLs) and CIPQs(CIPLs) are investigated. Necessary and sufficient
conditions for the holomorph of a quasigroup(loop) to be an AIPQ(AIPL) or
CIPQ(CIPL) are established. It is shown that if the holomorph of a
quasigroup(loop) is a AIPQ(AIPL) or CIPQ(CIPL), then the holomorph is
isomorphic to the quasigroup(loop). Hence, the holomorph of a quasigroup(loop)
is an AIPQ(AIPL) or CIPQ(CIPL) if and only if its automorphism group is trivial
and the quasigroup(loop) is a AIPQ(AIPL) or CIPQ(CIPL). Furthermore, it is
discovered that if the holomorph of a quasigroup(loop) is a CIPQ(CIPL), then
the quasigroup(loop) is a flexible unipotent CIPQ(flexible CIPL of exponent 2).
By constructing two isotopic quasigroups(loops) $U$ and $V$ such that their
automorphism groups are not trivial, it is shown that $U$ is a AIPQ or
CIPQ(AIPL or CIPL) if and only if $V$ is a AIPQ or CIPQ(AIPL or CIPL).
Explanations and procedures are given on how these CIPQs can be used to double
encrypt information.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 12:43:22 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Jaiyeola",
"Temitope Gbolahan",
""
],
[
"Adeniran",
"John Olusola",
""
]
] | [
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] |
802.1429 | Jaiyeola Temitope Gbolahan | Temitope Gbolahan Jaiyeola, John Olusola Adeniran | On A Cryptographic Identity In Osborn Loops | 10 pages, submitted for publication | null | null | null | math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study digs out some new algebraic properties of an Osborn loop that will
help in the future to unveil the mystery behind the middle inner mappings
$T_{(x)}$ of an Osborn loop. These new algebraic properties, will open our eyes
more to the study of Osborn loops like CC-loops which has received a
tremendious attention in this $21^\textrm{st}$ and VD-loops whose study is yet
to be explored. In this study, some algebraic properties of non-WIP Osborn
loops have been investigated in a broad manner. Huthnance was able to deduce
some algebraic properties of Osborn loops with the WIP i.e universal weak
WIPLs. So this work exempts the WIP. Two new loop identities, namely left self
inverse property loop(LSIPL) identity and right self inverse property
loop(RSLPL) are introduced for the first time and it is shown that in an Osborn
loop, they are equivalent. A CC-loop is shown to be power associative if and
only if it is a RSLPL or LSIPL. Among the few identities that have been
established for Osborn loops, one of them is recognized and recommended for
cryptography in a similar spirit in which the cross inverse property has been
used by Keedwell following the fact that it was observed that Osborn loops that
do not have the LSIP or RSIP or 3-PAPL or weaker forms of inverse property,
power associativity and diassociativity to mention a few, will have cycles(even
long ones). These identity is called an Osborn cryptographic identity(or just a
cryptographic identity).
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 12:50:34 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Jaiyeola",
"Temitope Gbolahan",
""
],
[
"Adeniran",
"John Olusola",
""
]
] | [
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] |
802.143 | Francis Bach | Jacob Abernethy, Francis Bach (INRIA Rocquencourt), Theodoros
Evgeniou, Jean-Philippe Vert (CB) | A New Approach to Collaborative Filtering: Operator Estimation with
Spectral Regularization | null | null | null | null | cs.LG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general approach for collaborative filtering (CF) using spectral
regularization to learn linear operators from "users" to the "objects" they
rate. Recent low-rank type matrix completion approaches to CF are shown to be
special cases. However, unlike existing regularization based CF methods, our
approach can be used to also incorporate information such as attributes of the
users or the objects -- a limitation of existing regularization based CF
methods. We then provide novel representer theorems that we use to develop new
estimation methods. We provide learning algorithms based on low-rank
decompositions, and test them on a standard CF dataset. The experiments
indicate the advantages of generalizing the existing regularization based CF
methods to incorporate related information about users and objects. Finally, we
show that certain multi-task learning methods can be also seen as special cases
of our proposed approach.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 12:55:34 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Dec 2008 14:05:14 GMT"
}
] | 2008-12-19T00:00:00 | [
[
"Abernethy",
"Jacob",
"",
"INRIA Rocquencourt"
],
[
"Bach",
"Francis",
"",
"INRIA Rocquencourt"
],
[
"Evgeniou",
"Theodoros",
"",
"CB"
],
[
"Vert",
"Jean-Philippe",
"",
"CB"
]
] | [
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802.1431 | Matus Medo | Matus Medo, Jan Smrek | Heterogeneous network with distance dependent connectivity | 6 pages, 4 figures, minor clarifications and references added | European Physical Journal B 63, 273-278 (2008) | 10.1140/epjb/e2008-00236-4 | null | physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a network model based on an infinite regular square lattice
embedded in the Euclidean plane where the node connection probability is given
by the geometrical distance of nodes. We show that the degree distribution in
the basic model is sharply peaked around its mean value. Since the model was
originally developed to mimic the social network of acquaintances, to broaden
the degree distribution we propose its generalization. We show that when
heterogeneity is introduced to the model, it is possible to obtain fat tails of
the degree distribution. Meanwhile, the small-world phenomenon present in the
basic model is not affected. To support our claims, both analytical and
numerical results are obtained.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 13:06:23 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jun 2008 12:00:20 GMT"
}
] | 2008-06-23T00:00:00 | [
[
"Medo",
"Matus",
""
],
[
"Smrek",
"Jan",
""
]
] | [
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802.1432 | Paolo Maria Mariano | Paolo Maria Mariano | Representation of Material Elements and Geometry of Substructural
Interactions | 20 pages, in print on "Quaderni di Matematica" | null | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper collects some characteristic aspects of the general model-building
framework of the mechanics of complex bodies, that are bodies in which the
material substructure influences prominently the gross behavior through
interactions conjugated with substructural changes. The emphasis in on issues
that are foundational in nature: the geometrica description of the material
elements, their energetic characterization, the representation of interactions,
conditions for the existence of ground states in conservative setting.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 13:10:51 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Mariano",
"Paolo Maria",
""
]
] | [
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] |
802.1433 | Yu-Jun Cui | Anh-Minh Tang (ENPC-Cermes), Yu-Jun Cui (ENPC-Cermes), Nathalie Barnel
(EDF) | Thermo-mechanical behaviour of a compacted swelling clay | null | G\'eotechnique 58, 1 (2008) 45-54 | 10.1680/geot.2008.58.1.45 | null | physics.class-ph | null | Compacted unsaturated swelling clay is often considered as a possible buffer
material for deep nuclear waste disposal. An isotropic cell permitting
simultaneous control of suction, temperature and pressure was used to study the
thermo-mechanical behaviour of this clay. Tests were performed at total
suctions ranging from 9 to 110 MPa, temperature from 25 to 80 degrees C,
isotropic pressure from 0.1 to 60 MPa. It was observed that heating at constant
suction and pressure induces either swelling or contraction. The results from
compression tests at constant suction and temperature evidenced that at lower
suction, the yield pressure was lower, the elastic compressibility parameter
and the plastic compressibility parameter were higher. On the other hand, at a
similar suction, the yield pressure was slightly influenced by the temperature;
and the compressibility parameters were insensitive to temperature changes. The
thermal hardening phenomenon was equally evidenced by following a
thermo-mechanical path of loading-heating-cooling-reloading.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 13:14:05 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Tang",
"Anh-Minh",
"",
"ENPC-Cermes"
],
[
"Cui",
"Yu-Jun",
"",
"ENPC-Cermes"
],
[
"Barnel",
"Nathalie",
"",
"EDF"
]
] | [
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] |
802.1434 | Toshihiko Ota | Srubabati Goswami, Toshihiko Ota | Testing non-unitarity of neutrino mixing matrices at neutrino factories | 15 pages, 8 eps files | Phys.Rev.D78:033012,2008 | 10.1103/PhysRevD.78.033012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we explore the effect of non-unitary neutrino mixing on
neutrino oscillation probabilities both in vacuum and matter. In particular, we
consider the $\nu_\mu \to \nu_\tau$ channel and using a Neutrino Factory as the
source for $\nu_\mu$'s discuss the constraints that can be obtained on the
moduli and phases of the parameters characterizing the violation of unitarity.
We point out how the new CP violation phases present in the case where the
non-unitary mixings give rise to spurious ``degenerate'' solutions in the
parameter space and discuss how the true solutions can be extricated by
combining measurements at several baselines.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 13:21:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Goswami",
"Srubabati",
""
],
[
"Ota",
"Toshihiko",
""
]
] | [
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802.1435 | Paolo Maria Mariano | Paolo Maria Mariano, Giuseppe Modica | Ground states in complex bodies | 30 pages, in print on ESAIM-COCV | null | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A unified framework for analyzing the existence of ground states in wide
classes of elastic complex bodies is presented here. The approach makes use of
classical semicontinuity results, Sobolev mappinngs and Cartesian currents.
Weak diffeomorphisms are used to represent macroscopic deformations. Sobolev
maps and Cartesian currents describe the inner substructure of the material
elements. Balance equations for irregular minimizers are derived. A
contribution to the debate about the role of the balance of configurational
actions follows. After describing a list of possible applications of the
general results collected here, a concrete discussion of the existence of
ground states in thermodynamically stable quasicrystals is presented at the
end.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 13:26:10 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Mariano",
"Paolo Maria",
""
],
[
"Modica",
"Giuseppe",
""
]
] | [
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] |
802.1436 | Yuri Pogorelov | H.G. Silva, Y.G. Pogorelov | Quantum effects for ballistic transport in spintronic devices | 9 pages, 9 figures | null | 10.1103/PhysRevB.78.094428 | null | cond-mat.mtrl-sci | null | Recent fabrication of atomic precision nanodevices for spintronics greatly
boosted their performance and also revealed new interesting features, as
oscillating magnetoresistance with number of atomic layers in a multilayered
structure. This motivates the need to go beyond the usual theoretical approach
of semi-classical continuous layers. Here the simple tight-binding dynamics is
used to describe quantum conduction in a multicomponent system with
spin-polarized electrodes separated by an ultrathin and atomically coherent
non-magnetic spacer (either metallic or insulating). A possibility is indicated
for obtaining a huge resonant enhancement of magnetoresistance in such device
by a special choice of gate voltage on the spacer element.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 13:50:26 GMT"
}
] | 2013-05-29T00:00:00 | [
[
"Silva",
"H. G.",
""
],
[
"Pogorelov",
"Y. G.",
""
]
] | [
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] |
802.1437 | Gorchinskiy Sergey | Sergey Gorchinskiy | Notes on the biextension of Chow groups | 42 pages; sections concerning determinant of cohomology construction
are completely changed; several improvements in other parts are made | Fields Inst. Commun., 56, Amer. Math. Soc. (2009), 111-148 | null | null | math.AG math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper discusses four approaches to the biextension of Chow groups and
their equivalences. These are the following: an explicit construction given by
S.Bloch, a construction in terms of the Poincare biextension of dual
intermediate Jacobians, a construction in terms of K-cohomology, and a
construction in terms of determinant of cohomology of coherent sheaves. A new
approach to J.Franke's Chow categories is given. An explicit formula for the
Weil pairing of algebraic cycles is obtained.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 13:41:19 GMT"
},
{
"version": "v2",
"created": "Sat, 7 Mar 2009 11:23:18 GMT"
}
] | 2018-03-29T00:00:00 | [
[
"Gorchinskiy",
"Sergey",
""
]
] | [
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802.1438 | Sylvain Maillot | Sylvain Maillot | Some open 3-manifolds and 3-orbifolds without locally finite canonical
decompositions | 17 pages, 5 figures | Algebr. Geom. Topol. 8 (2008) 1795-1810 | 10.2140/agt.2008.8.1795 | null | math.GT | null | We give examples of open 3-manifolds and 3-orbifolds that exhibit
pathological behavior with respect to splitting along surfaces (2-suborbifolds)
with nonnegative Euler characteristic.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:04:51 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 12:36:27 GMT"
}
] | 2014-10-01T00:00:00 | [
[
"Maillot",
"Sylvain",
""
]
] | [
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802.1439 | Adrian Perez Galvan | A. Perez Galvan (1), Y. Zhao (1), L. A. Orozco (1), E. Gomez (2), A.
D. Lange (2), F. Baumer (2), G. D. Sprouse (2) ((1)Dept. of Physics,
University of Maryland, College Park, MD, U.S.A., (2)Dept. of Physics and
Astronomy, State University of New York at Stony Brook, Stony Brook, NY,
U.S.A.) | Comparison of hyperfine anomalies in the 5S_{1/2} and 6S_{1/2} levels of
^{85}Rb and ^{87}Rb | 9 pages, 3 figures | Physics Letters B 655 (2007), 114-118 | 10.1016/j.physletb.2007.09.042 | null | physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We observe a hyperfine anomaly in the measurement of the hyperfine splitting
of the 6S_{1/2} excited level in rubidium. We perform two step spectroscopy
using the 5S_{1/2}->5P_{1/2}->6S_{1/2} excitation sequence. We measure the
splitting of the 6S1/2 level and obtain for the magnetic dipole constants of
^{85}Rb and ^{87}Rb A = 239.18(4) MHz and A=807.66(8) MHz, respectively. The
hyperfine anomaly difference of_{87}delta_{85}=-0.0036(2) comes from the Bohr
Weisskopf effect: a correction to the point interaction between the finite
nuclear magnetization and the electrons, and agrees with that obtained in the
5S_{1/2} ground state.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 13:57:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Galvan",
"A. Perez",
""
],
[
"Zhao",
"Y.",
""
],
[
"Orozco",
"L. A.",
""
],
[
"Gomez",
"E.",
""
],
[
"Lange",
"A. D.",
""
],
[
"Baumer",
"F.",
""
],
[
"Sprouse",
"G. D.",
""
]
] | [
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] |
802.144 | Donal Connon | Donal F. Connon | Determination of some generalised Euler sums involving the digamma
function | Contains additional references | null | null | null | math.CA math.NT | null | This paper evaluates some generalised Euler sums involving the digamma
function.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:00:05 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Feb 2008 11:42:00 GMT"
},
{
"version": "v3",
"created": "Sun, 9 Mar 2008 15:43:00 GMT"
}
] | 2008-03-09T00:00:00 | [
[
"Connon",
"Donal F.",
""
]
] | [
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] |
802.1441 | Jun Chen | Jun Chen, Joseph B. Altepeter, Milja Medic, Kim Fook Lee, Burc Gokden,
Robert H. Hadfield, Sae Woo Nam, and Prem Kumar | Demonstration of a Quantum Controlled-NOT Gate in the Telecom Band | 4 pages, 3 figures | null | 10.1103/PhysRevLett.100.133603 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first quantum controlled-NOT (CNOT) gate realized using a
fiber-based indistinguishable photon-pair source in the 1.55 $\mu$m
telecommunications band. Using this free-space CNOT gate, all four Bell states
are produced and fully characterized by performing quantum state tomography,
demonstrating the gate's unambiguous entangling capability and high fidelity.
Telecom-band operation makes this CNOT gate particularly suitable for quantum
information processing tasks that are at the interface of quantum communication
and linear optical quantum computing.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:02:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chen",
"Jun",
""
],
[
"Altepeter",
"Joseph B.",
""
],
[
"Medic",
"Milja",
""
],
[
"Lee",
"Kim Fook",
""
],
[
"Gokden",
"Burc",
""
],
[
"Hadfield",
"Robert H.",
""
],
[
"Nam",
"Sae Woo",
""
],
[
"Kumar",
"Prem",
""
]
] | [
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] |
802.1442 | Alessandro Melchiorri dr. | Roberta Camerini, Ruth Durrer, Alessandro Melchiorri, Antonio Riotto | Is Cosmology Compatible with Blue Gravity Waves ? | 5 Pages, 5 Figures | Phys.Rev.D77:101301,2008 | 10.1103/PhysRevD.77.101301 | null | astro-ph hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A primordial gravitational wave background with positive(blue) spectral index
is expected in several non-standard inflationary cosmologies where the
stress-energy tensor violates the null energy condition. Here we show that a
sizable amount of blue gravitational waves is compatible with current
cosmological and astrophysical data. So far most of the works on parameter
estimation from cosmic microwave background data have assumed a negative or
negligible spectral index. The present limits on cosmological parameters,
especially on the scalar spectral index, widen up considerably when one allows
also for blue tilts of the tensor spectrum. Since the amplitude of the CMB
B-mode polarization is larger in these models, future data from Planck are
likely to provide crucial measurements.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:56:50 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Camerini",
"Roberta",
""
],
[
"Durrer",
"Ruth",
""
],
[
"Melchiorri",
"Alessandro",
""
],
[
"Riotto",
"Antonio",
""
]
] | [
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] |
802.1443 | Wilrid Dubitzky | The CERES Collaboration | The CERES/NA45 Radial Drift Time Projection Chamber | 57 pages, 59 figures | Nucl.Instrum.Meth.A593:203-231,2008 | 10.1016/j.nima.2008.04.056 | null | nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The design, calibration, and performance of the first radial drift Time
Projection Chamber (TPC) are presented. The TPC was built and installed at the
CERES/NA45 experiment at the CERN SPS in the late nineties, with the objective
to improve the momentum resolution of the spectrometer. The upgraded experiment
took data twice, in 1999 and in 2000. After a detailed study of residual
distortions a spatial resolution of 340 um in the azimuthal and 640 um in the
radial direction was achieved, corresponding to a momentum resolution of Dp/p =
sqrt{(1% * p/GeV)^2 + (2%)^2}.
| [
{
"version": "v1",
"created": "Sat, 9 Feb 2008 15:33:49 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Mar 2008 13:18:39 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"The CERES Collaboration",
"",
""
]
] | [
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] |
802.1444 | Joanna Holt | J. Holt (1), C. N. Tadhunter (1), R. Morganti (2), ((1) University of
Sheffield, (2) Netherlands Foundation for Research in Astronomy) | Fast outflows in compact radio sources: evidence for AGN-induced
feedback in the early stages of radio source evolution | Accepted for publication in MNRAS, 24 pages, 7 figures | null | 10.1111/j.1365-2966.2008.13089.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present intermediate resolution, wide wavelength coverage spectra for a
complete sample of 14 compact radio sources taken with the aim of investigating
the impact of the nuclear activity on the circumnuclear (ISM) in the early
stages of radio source evolution. We observe spatially extended line emission
(up to 20 kpc) in the majority of sources which is consistent with a quiescent
halo. In the nuclear apertures we observe broad, highly complex emission line
profiles. Multiple Gaussian modelling of the [O III]5007 line reveals 2-4
components which can have FWHM and blueshifts relative to the halo of up to
2000 km/s. We interpret these broad, blueshifted components as material in
outflow and discuss the kinematical evidence for jet-driven outflows.
Comparisons with samples in the literature show that compact radio sources
harbour more extreme nuclear kinematics than their extended counterparts, a
trend seen within our sample with larger velocities in the smaller sources. The
observed velocities are also likely to be influenced by source orientation with
respect to the observer's line of sight. Nine sources have associated HI
absorption. In common with the optical emission line gas, the HI profiles are
often highly complex with the majority of the detected components significantly
blueshifted, tracing outflows in the neutral gas. The sample has been tested
for stratification in the ISM (FWHM/ionisation potential/critical density) as
suggested by Holt et al. (2003) for PKS1345+12 but we find no significant
trends within the sample using a Spearman Rank analysis. This study supports
the idea that compact radio sources are young radio loud AGN observed during
the early stages of their evolution and currently shedding their natal cocoons
through extreme circumnuclear outflows.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:15:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Holt",
"J.",
""
],
[
"Tadhunter",
"C. N.",
""
],
[
"Morganti",
"R.",
""
]
] | [
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802.1445 | Joana Santos S. | Joana S. Santos (1), Piero Rosati (2), Paolo Tozzi (3), Hans
Boehringer (1), Stefano Ettori (4), Andrea Bignamini (3) ((1) Max Planck
Institut fuer extraterrestrische Physik, (2) European Southern Observatory,
(3) INAF-Osservatorio Astronomico di Trieste, (4) INAF-Osservatorio
Astronomico di Bologna) | Searching for Cool Core Clusters at High redshift | 14 pages, 12 figures, to appear in Astronomy & Astrophysics | null | 10.1051/0004-6361:20078815 | null | astro-ph | null | We investigate the detection of Cool Cores (CCs) in the distant galaxy
cluster population, with the purpose of measuring the CC fraction out to
redshift 0.7 < z < 1.4. Using a sample of nearby clusters spanning a wide range
of morphologies, we define criteria to characterize cool cores, which are
applicable to the high redshift sample. We analyzed azimuthally averaged
surface brightness (SB) profiles using the known scaling relations and fitted
single/double beta models to the data. Additionally, we measured a surface
brightness concentration, c_SB, as the ratio of the peak over the ambient SB.
To verify that this is an unbiased parameter as a function of redshift, we
developed a model independent "cloning" technique to simulate the nearby
clusters as they would appear at the same redshifts and luminosities as those
in the distant sample. A more physical parameterization of CC presence is
obtained by computing the cooling time at a radius of 20 kpc from the cluster
center. The distribution of the SB concentration and the stacked radial
profiles of the low-z sample, combined with published information on the CC
properties of these clusters, show 3 degrees of SB cuspiness: non-CC, moderate
and strong CC. The same analysis applied to the high-z clusters reveals two
regimes: non-CC and moderate CC. The cooling time distribution corroborates
this result by showing a strong negative correlation with c_SB. Our analysis
indicates a significant fraction of distant clusters harboring a moderate CC
out to z=1.4, similar to those found in the local sample. The absence of strong
cooling which we report is likely linked with a higher merger rate expected at
redshift z > 0.7, and should also be related with the shorter age of distant
clusters, implying less time to develop a cool core.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:04:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Santos",
"Joana S.",
""
],
[
"Rosati",
"Piero",
""
],
[
"Tozzi",
"Paolo",
""
],
[
"Boehringer",
"Hans",
""
],
[
"Ettori",
"Stefano",
""
],
[
"Bignamini",
"Andrea",
""
]
] | [
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] |
802.1446 | Marcelo Gleiser | Marcelo Gleiser, Joel Thorarinson, and Sara Imari Walker | Punctuated Chirality | 13 pages, 4 color figures. Final version published in Origins of Life
and Evolution of Biospheres. Typos corrected, figures improved, and a few
definitions and word usage clarified | Orig. Life Evol. Biosph.38:499-508, 2008 | 10.1007/s11084-008-9147-0 | null | astro-ph cond-mat.stat-mech physics.bio-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most biomolecules occur in mirror, or chiral, images of each other. However,
life is homochiral: proteins contain almost exclusively levorotatory (L) amino
acids, while only dextrorotatory (R) sugars appear in RNA and DNA. The
mechanism behind this fundamental asymmetry of life remains an open problem.
Coupling the spatiotemporal evolution of a general autocatalytic polymerization
reaction network to external environmental effects, we show through a detailed
statistical analysis that high intensity and long duration events may drive
achiral initial conditions towards chirality. We argue that life's
homochirality resulted from sequential chiral symmetry breaking triggered by
environmental events, thus extending the theory of punctuated equilibrium to
the prebiotic realm. Applying our arguments to other potentially life-bearing
planetary platforms, we predict that a statistically representative sampling
will be racemic on average.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:19:24 GMT"
},
{
"version": "v2",
"created": "Wed, 29 Oct 2008 14:31:26 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Gleiser",
"Marcelo",
""
],
[
"Thorarinson",
"Joel",
""
],
[
"Walker",
"Sara Imari",
""
]
] | [
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802.1447 | Sylvain Maillot | Sylvain Maillot | A JSJ splitting for triangulated open 3-manifolds | 20 pages | null | null | null | math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a sufficient condition for an open 3-manifold to admit a
decomposition along properly embedded open annuli and tori, generalizing the
toric splitting of Jaco-Shalen and Johannson.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:22:42 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Maillot",
"Sylvain",
""
]
] | [
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802.1448 | Christian Mercat | Christian Mercat (I3M) | Discrete Riemann surfaces, linear and non-linear | http://www.mfo.de/cgi-bin/tagung_espe?type=21&tnr=0610. Abstracts
from the workshop held March 5-11, 2006. Organized by Alexander I. Bobenko,
Richard W. Kenyon, John M. Sullivan and G\"unter M. Ziegler | Dans Discrete Differential Geometry - Discrete Differential
Geometry, Oberwolfach : Allemagne (2006) | null | null | math-ph math.CV math.MP | null | 3 pages presentation of the theory of discrete conformal parameterization
using circle patterns or its linearized theory. Principal results and ideas.
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802.1449 | Liviu Aur | C.Micu, E. Papp, L. Aur | Dynamic localization of lattice electrons under time dependent electric
and magnetic fields | 10 pages. Submitted to: J.Phys. : Condens. Matter | null | null | null | cond-mat.mes-hall | null | Applying the method of characteristics leads to wavefunctions and dynamic
localization conditions for electrons on the one dimensional lattice under
perpendicular time dependent electric and magnetic fields. Such conditions
proceed again in terms of sums of products of Bessel functions of the first
kind. However, this time one deals with both the number of magnetic flux quanta
times $\pi $ and the quotients between the Bloch frequency and the ones
characterizing competing fields. Tuning the phases of time dependent
modulations leads to interesting frequency mixing effects providing an
appreciable simplification of dynamic localization conditions one looks for.
The understanding is that proceeding in this manner, the time dependent
superposition mentioned above gets reduced effectively to the influence of
individual ac-fields exhibiting mixed frequency quotients. Besides pure field
limits and superpositions between uniform electric and time dependent magnetic
fields, parity and periodicity effects have also been discussed.
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802.145 | Christian Robenhagen Ravnsh{\o}j | Christian Robenhagen Ravnshoj | Generators of Jacobians of Genus Two Curves | null | null | null | null | math.AG | null | We prove that in most cases relevant to cryptography, the Frobenius
endomorphism on the Jacobian of a genus two curve is represented by a diagonal
matrix with respect to an appropriate basis of the subgroup of l-torsion
points. From this fact we get an explicit description of the Weil-pairing on
the subgroup of l-torsion points. Finally, the explicit description of the
Weil-pairing provides us with an efficient, probabilistic algorithm to find
generators of the subgroup of l-torsion points on the Jacobian of a genus two
curve.
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] |
802.1451 | Mason A. Porter | Fernando Fraternali, Mason A. Porter, and Chiara Daraio | Optimal design of composite granular protectors | 13 pages, 23 figures (many with multiple parts), to appear in
Mechanics of Advanced Materials and Structures | null | null | null | cond-mat.mtrl-sci cond-mat.stat-mech nlin.PS physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ an evolutionary algorithm to investigate the optimal design of
composite protectors using one-dimensional granular chains composed of beads of
various sizes, masses, and stiffnesses. We define a fitness function using the
maximum force transmitted from the protector to a "wall" that represents the
body to be protected and accordingly optimize the {topology} (arrangement),
{size}, and {material} of the chain. We obtain optimally randomized granular
protectors characterized by high-energy equipartition and the transformation of
incident waves into interacting solitary pulses. We consistently observe that
the pulses traveling to the wall combine to form an extended (long-wavelength),
small-amplitude pulse.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 15:43:14 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Dec 2008 23:01:40 GMT"
}
] | 2008-12-05T00:00:00 | [
[
"Fraternali",
"Fernando",
""
],
[
"Porter",
"Mason A.",
""
],
[
"Daraio",
"Chiara",
""
]
] | [
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802.1452 | Genevi\`eve Parmentier | G. Parmentier (1,3), S.P. Goodwin (2), P. Kroupa (3), H. Baumgardt (3)
((1) IAGL, Liege, Belgium; (2) University of Sheffield, UK (3) AIfA, Bonn,
Germany) | The shape of the initial cluster mass function: what it tells us about
the local star formation efficiency | accepted in ApJ | null | 10.1086/587137 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore how the expulsion of gas from star-cluster forming cloud-cores due
to supernova explosions affects the shape of the initial cluster mass function,
that is, the mass function of star clusters when effects of gas expulsion are
over. We demonstrate that if the radii of cluster-forming gas cores are roughly
constant over the core mass range, as supported by observations, then more
massive cores undergo slower gas expulsion. Therefore, for a given star
formation efficiency, more massive cores retain a larger fraction of stars
after gas expulsion. The initial cluster mass function may thus differ from the
core mass function substantially, with the final shape depending on the star
formation efficiency. A mass-independent star formation efficiency of about 20
per cent turns a power-law core mass function into a bell-shaped initial
cluster mass function, while mass-independent efficiencies of order 40 per cent
preserve the shape of the core mass function.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:35:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Parmentier",
"G.",
""
],
[
"Goodwin",
"S. P.",
""
],
[
"Kroupa",
"P.",
""
],
[
"Baumgardt",
"H.",
""
]
] | [
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802.1453 | Valentin Govorov | V. Govorov | Prime numbers of a kind x^2+1 | 4 pages | null | null | null | math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The number of primes of a kind x^2+1 is infinite.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 14:57:19 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Govorov",
"V.",
""
]
] | [
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] |
802.1454 | Jean-Gabriel Luque | Jean-Gabriel Luque (IGM, IGM-LabInfo) | Macdonald polynomials at $t=q^k$ | 19pp; Journal of Algebra (2009) In Press | Journal of Algebra 324 (2010) 36-50 | 10.1016/j.jalgebra.2009.11.012 | null | math.CO | null | We investigate the homogeneous symmetric Macdonald polynomials
$P_\lambda(\X;q,t)$ for the specialization $t=q^k$. We show an identity relying
the polynomials $P_\lambda(\X;q,q^k)$ and
$P_\lambda(\frac{1-q}{1-q^k}\X;q,q^k)$. As a consequence, we describe an
operator whose eigenvalues characterize the polynomials $P_\lambda(\X;q,q^k)$.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:09:18 GMT"
}
] | 2010-05-14T00:00:00 | [
[
"Luque",
"Jean-Gabriel",
"",
"IGM, IGM-LabInfo"
]
] | [
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] |
802.1455 | Andreas Wirzba | Ulf-G. Mei{\ss}ner, A.M. Rakhimov, A. Wirzba, U.T. Yakhshiev | Neutron-proton mass difference in finite nuclei and the Nolen-Schiffer
anomaly | 13 pages, 6 figures (some typos corrected and references added) | Eur.Phys.J.A36:37-48,2008 | 10.1140/epja/i2008-10571-0 | FZJ-IKP-TH-2008-2 | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutron-proton mass difference in finite nuclei is studied in the
framework of a medium-modified Skyrme model. The possible interplay between the
effective nucleon mass in finite nuclei and the Nolen-Schiffer anomaly is
discussed. In particular, we find that a correct description of the properties
of mirror nuclei leads to a stringent restriction of possible modifications of
the nucleon's effective mass in nuclei.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:18:21 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Apr 2008 10:37:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Meißner",
"Ulf-G.",
""
],
[
"Rakhimov",
"A. M.",
""
],
[
"Wirzba",
"A.",
""
],
[
"Yakhshiev",
"U. T.",
""
]
] | [
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] |
802.1456 | Paola Mannucci | Martino Bardi, Paola Mannucci | Comparison Principles for subelliptic equations of Monge-Ampere type | null | null | null | accepted paper (2008) | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present two comparison principles for viscosity sub- and supersolutions of
Monge-Ampere-type equations associated to a family of vector fields. In
particular, we obtain the uniqueness of a viscosity solution to the Dirichlet
problem for the equation of prescribed horizontal Gauss curvature in a Carnot
group.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:18:58 GMT"
}
] | 2008-02-15T00:00:00 | [
[
"Bardi",
"Martino",
""
],
[
"Mannucci",
"Paola",
""
]
] | [
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] |
802.1457 | Santiago Vargas Dominguez | S. Vargas Dominguez, L. Rouppe van der Voort, J.A. Bonet, V. Martinez
Pillet, M. Van Noort, Y. Katsukawa | Moat flow in the vicinity of sunspots for various penumbral
configurations | 11 pages, 10 figures, 3 tables (see
http://www.iac.es/galeria/svargas/vargas2008.pdf for better quality figures | null | 10.1086/587139 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High-resolution time series of sunspots have been obtained with the Swedish
1m Solar Telescope between 2003 and 2006 at different locations on the solar
disc. Proper motions in seven different active regions have been studied. The
analysis has been done by applying local correlation tracking to every series
of sunspots, each of them more than 40 minutes long. The sunspots' shapes
include a different variety of penumbral configurations. We report on a
systematic behaviour of the large-scale outflows surrounding the sunspots,
commonly known as moat flows, that are essentially present only when preceded
by a penumbra not tangential but perpendicular to the sunspot border. We
present one case for which this rule appears not to be confirmed. We speculate
that the magnetic neutral line, which is located in the vicinity of the
anomalous region, might be responsible for blocking the outflow. These new
results confirm the systematic and strong relation between the moat flows and
the existence of penumbrae. A comparative statistical study between moats and
standard granulation is also performed.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:19:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dominguez",
"S. Vargas",
""
],
[
"van der Voort",
"L. Rouppe",
""
],
[
"Bonet",
"J. A.",
""
],
[
"Pillet",
"V. Martinez",
""
],
[
"Van Noort",
"M.",
""
],
[
"Katsukawa",
"Y.",
""
]
] | [
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] |
802.1458 | Arthur Useinov | A.N. Useinov, L.R. Tagirov, R.G. Deminov, Y. Zhou, G. Pan | Mean-free path effects in magnetoresistance of ferromagnetic
nanocontacts | 13 pages, 7 figures | Eur. Phys. J. B 60, 187-192 (2007) | 10.1140/epjb/e2007-00335-8 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated the mean-free path effects on the magnetoresistance of
ferromagnetic nanocontacts. For most combinations of parameters the
magnetoresistance monotonously decreases with increasing the contact
cross-section. However, for a certain choice of parameters the calculations
show non-monotonous behavior of the magnetoresistance in the region in which
the diameter of the contact becomes comparable with the mean-free path of
electrons. We attribute this effect to different conduction regimes in the
vicinity of the nanocontact: ballistic for electrons of one spin projection,
and simultaneously diffusive for the other. Furthermore, at certain
combinations of spin asymmetries of the bulk mean-free paths in a
heterocontact, the magnetoresistance can be almost constant, or may even grow
as the contact diameter increases. Thus, our calculations suggest a way to
search for combinations of material parameters, for which high
magnetoresistances can be achieved not only at the nanometric size of the
contact, but also at much larger cross-sections of nanocontacts which can be
easier for fabrication with current technologies. The trial calculations of the
magnetoresistance with material parameters close to those for the Mumetal-Ni
heterocontacts agree satisfactorily with the available experimental data.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:39:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Useinov",
"A. N.",
""
],
[
"Tagirov",
"L. R.",
""
],
[
"Deminov",
"R. G.",
""
],
[
"Zhou",
"Y.",
""
],
[
"Pan",
"G.",
""
]
] | [
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] |
802.1459 | Norbert Euler | N. Euler and P.G.L. Leach | Aspects of proper differential sequences of ordinary differential
equations | 18 pages | null | 10.1007/s11232-009-0038-y | null | nlin.SI | null | We define a proper differential sequence of ordinary differential equations
and introduce a method to derive an alternative sequence of integrals for such
a sequence. We describe some general properties which are illustrated by
several examples.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:43:54 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 09:38:42 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Euler",
"N.",
""
],
[
"Leach",
"P. G. L.",
""
]
] | [
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] |
802.146 | Koenraad Schalm | A. Nata Atmaja, K. Schalm | Photon and Dilepton Production in Soft Wall AdS/QCD | 22 pages, 3 figs; v2: references added, clarifications made and minor
corrections | JHEP 1008:124,2010 | 10.1007/JHEP08(2010)124 | ITFA-2008-02 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Soft-Wall-model of AdS/QCD to calculate photon production in
strongly coupled Quark Gluon Plasma (sQGP). The IR cut-off only affects the
low-frequency-component of the production rate. The full spectral function is
determined numerically and shows remarkable similarity to computations of the
photon production rate in AdS-duals of $\mathcal{N}=2$ theories with massive
flavor. It is further support that Soft-Wall AdS-QCD correctly captures the IR
physics of the chiral perturbation theory regime of QCD. We confirm this by
relating the IR-effects of the massive flavor deformations to the AdS/QCD soft
wall cut-off. The AdS/QCD spectral function is smooth, however, and unlike
massive flavor models shows no spectral peaks.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:44:44 GMT"
},
{
"version": "v2",
"created": "Thu, 5 Aug 2010 14:46:02 GMT"
}
] | 2017-09-07T00:00:00 | [
[
"Atmaja",
"A. Nata",
""
],
[
"Schalm",
"K.",
""
]
] | [
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802.1461 | Alexandre Eremenko | Alexandre Eremenko and Andrei Gabrielov | Analytic continuation of eigenvalues of a quartic oscillator | 40 pages, 11 figures | Comm. Math. Phys., v. 287, No. 2 (2009) 431-457 | 10.1007/s00220-008-0663-6 | null | math-ph math.CV math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Schrodinger operator on the real line with even quartic
potential and study analytic continuation of eigenvalues, as functions of the
coefficient of the potential. We prove several properties of this analytic
continuation conjectured by Bender, Wu, Loeffel and Martin. 1. All eigenvalues
are given by branches of two multi-valued analytic functions, one for even
eigenfunctions and one for odd ones. 2. The only singularities of these
multi-valued functions in the complex plane are algebraic ramification points,
and there are only finitely many singularities over each compact subset of the
plane.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:49:33 GMT"
}
] | 2012-02-07T00:00:00 | [
[
"Eremenko",
"Alexandre",
""
],
[
"Gabrielov",
"Andrei",
""
]
] | [
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] |
802.1462 | Wenjin Xu (Eric) | W.J. Xu, B. Zhang, Z. Wang, S. Chu, W. Li, R.H. Yu and X.X. Zhang | Anomalous Hall effect in Fe/Cu bilayers | 12 pages, 4 figures;
http://www.springerlink.com/content/1718722u75j24587/ | The European Physical Journal B Volume 65, Number 2, 233-237,
September 2008 | 10.1140/epjb/e2008-00350-3 | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scaling of anomalous Hall resistivity on the longitudinal resistivity has
been intensively studied in the different magnetic systems, including
multilayers and granular films, to examine which mechanism, skew scattering or
side-jump, dominates. The basis of the scaling law is that both the
resistivities are due to the electron scattering at the imperfections in the
materials. By studying of anomalous Hall effect (AHE) in the simple Fe/Cu
bilayers, we demonstrate that the measured anomalous Hall effect should not
follow the scaling laws derived from skew scattering or side-jump mechanism due
to the short-circuit and shunting effects of the non-magnetic layers.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:55:25 GMT"
}
] | 2011-06-01T00:00:00 | [
[
"Xu",
"W. J.",
""
],
[
"Zhang",
"B.",
""
],
[
"Wang",
"Z.",
""
],
[
"Chu",
"S.",
""
],
[
"Li",
"W.",
""
],
[
"Yu",
"R. H.",
""
],
[
"Zhang",
"X. X.",
""
]
] | [
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] |
802.1463 | Mikhail Sheftel | M. B. Sheftel and A. A. Malykh | Lift of Invariant to Non-Invariant Solutions of Complex Monge-Amp\`ere
Equations | 15 pages, LaTeX2e | null | 10.2991/jnmp.2008.15.s3.37 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how partner symmetries of the elliptic and hyperbolic complex
Monge-Amp\`ere equations (CMA and HCMA) provide a lift of non-invariant
solutions of three- and two-dimensional reduced equations, i.e., a lift of
invariant solutions of the original CMA and HCMA equations, to non-invariant
solutions of the latter four-dimensional equations. The lift is applied to
non-invariant solutions of the two-dimensional Helmholtz equation to yield
non-invariant solutions of CMA, and to non-invariant solutions of
three-dimensional wave equation and three-dimensional hyperbolic Boyer-Finley
equation to yield non-invariant solutions of HCMA. By using these solutions as
metric potentials, it is possible to construct four-dimensional Ricci-flat
metrics of Euclidean and ultra-hyperbolic signatures that have non-zero
curvature tensors and no Killing vectors.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:02:47 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Sheftel",
"M. B.",
""
],
[
"Malykh",
"A. A.",
""
]
] | [
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] |
802.1464 | Julia Kempe | Julia Kempe and Oded Regev and Falk Unger and Ronald de Wolf | Upper Bounds on the Noise Threshold for Fault-tolerant Quantum Computing | 14 pages, 3 figures | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove new upper bounds on the tolerable level of noise in a quantum
circuit. We consider circuits consisting of unitary k-qubit gates each of whose
input wires is subject to depolarizing noise of strength p, as well as
arbitrary one-qubit gates that are essentially noise-free. We assume that the
output of the circuit is the result of measuring some designated qubit in the
final state. Our main result is that for p>1-\Theta(1/\sqrt{k}), the output of
any such circuit of large enough depth is essentially independent of its input,
thereby making the circuit useless. For the important special case of k=2, our
bound is p>35.7%. Moreover, if the only allowed gate on more than one qubit is
the two-qubit CNOT gate, then our bound becomes 29.3%. These bounds on p are
notably better than previous bounds, yet are incomparable because of the
somewhat different circuit model that we are using. Our main technique is the
use of a Pauli basis decomposition, which we believe should lead to further
progress in deriving such bounds.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:08:26 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Kempe",
"Julia",
""
],
[
"Regev",
"Oded",
""
],
[
"Unger",
"Falk",
""
],
[
"de Wolf",
"Ronald",
""
]
] | [
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] |
802.1465 | Cyril Allauzen | Cyril Allauzen and Mehryar Mohri | 3-Way Composition of Weighted Finite-State Transducers | Added missing acknowledgments | null | null | null | cs.CC | null | Composition of weighted transducers is a fundamental algorithm used in many
applications, including for computing complex edit-distances between automata,
or string kernels in machine learning, or to combine different components of a
speech recognition, speech synthesis, or information extraction system. We
present a generalization of the composition of weighted transducers, 3-way
composition, which is dramatically faster in practice than the standard
composition algorithm when combining more than two transducers. The worst-case
complexity of our algorithm for composing three transducers $T_1$, $T_2$, and
$T_3$ resulting in $T$, \ignore{depending on the strategy used, is $O(|T|_Q
d(T_1) d(T_3) + |T|_E)$ or $(|T|_Q d(T_2) + |T|_E)$,} is $O(|T|_Q \min(d(T_1)
d(T_3), d(T_2)) + |T|_E)$, where $|\cdot|_Q$ denotes the number of states,
$|\cdot|_E$ the number of transitions, and $d(\cdot)$ the maximum out-degree.
As in regular composition, the use of perfect hashing requires a pre-processing
step with linear-time expected complexity in the size of the input transducers.
In many cases, this approach significantly improves on the complexity of
standard composition. Our algorithm also leads to a dramatically faster
composition in practice. Furthermore, standard composition can be obtained as a
special case of our algorithm. We report the results of several experiments
demonstrating this improvement. These theoretical and empirical improvements
significantly enhance performance in the applications already mentioned.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:18:40 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Feb 2008 18:02:27 GMT"
}
] | 2008-02-22T00:00:00 | [
[
"Allauzen",
"Cyril",
""
],
[
"Mohri",
"Mehryar",
""
]
] | [
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] |
802.1466 | Xiaoping Yang | Xiaoping Yang, Jian Zhou, Hongming Weng, and Jinming Dong | Spin-orbit interaction in Au structures of various dimensionalities | 11 pages, 4 figures | Applied Physics Letters 92, 023115 (2008) | 10.1063/1.2836132 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Variation of the geometrical and electronic properties of the gold materials
in different dimensions has been investigated by $ab$
$initio$ method, taking into account the spin-orbit (SO) interaction. It is
found that SO effects in different dimensional Au materials depend greatly on
fundamental symmetry and dimensionality. For single walled gold nanotubes
(SWGNTs), SO interaction decreases significantly the conducting channel number
of achiral SWGNT (4, 0), and leads to spin splitting at Fermi level of chiral
SWGNT, indicating that quasi-1D SWGNT can be a good candidate for the
spin-electron devices. Furthermore, our results suggest that cage cluster might
be synthesizable experimentally by taking gold tube structure as parent
material.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:16:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yang",
"Xiaoping",
""
],
[
"Zhou",
"Jian",
""
],
[
"Weng",
"Hongming",
""
],
[
"Dong",
"Jinming",
""
]
] | [
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-0.0486693271,
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] |
802.1467 | Xiaoping Yang | Xiaoping Yang, Gang Wu | The study of structure, electronic and optical properties of
double-walled carbon nanotube bundle under hydrostatic pressure | 16 pages, 7 figures | Europhysics Letters 81, 47003 (2008) | 10.1209/0295-5075/81/47003 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Combining a classical force field, a tight-binding model, and
first-principles calculations, we have studied structural, electronic, and
optical properties of double-walled carbon nanotube (DWNT) bundles under
hydrostatic pressure. We find that the outer tube acts as a protection shield
for the inner tube and the inner tube increases the structure stability and the
ability to resist the pressure of the outer tube. Moreover, the collapsed
structures of the double-walled carbon nanotube bundle called ``parallel'' and
``in-between'' are more stable than the one called ``herringbone''. The
structural phase transition induces a pseudogap along symmetry line
\textit{$\Gamma $X}. Furthermore, the optical properties change greatly after
the collapse and a strong anisotropy appears in the collapsed structure. This
provides an efficient experimental way to detect structural phase transitions
in DWNT bundles.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:24:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yang",
"Xiaoping",
""
],
[
"Wu",
"Gang",
""
]
] | [
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] |
802.1468 | Oliver Jenkinson | Oscar F. Bandtlow, Oliver Jenkinson | On the Ruelle eigenvalue sequence | 9 pages, to appear in Ergod. Th. & Dyn. Sys. | null | null | null | math.DS math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For certain real analytic data, we show that the eigenvalue sequence of the
associated transfer operator L is insensitive to the holomorphic function space
on which L acts. Explicit bounds on this eigenvalue sequence are established.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:28:34 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Bandtlow",
"Oscar F.",
""
],
[
"Jenkinson",
"Oliver",
""
]
] | [
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] |
802.1469 | Dimitris Tsomokos | D.I. Tsomokos, S. Ashhab, F. Nori | Fully-connected network of superconducting qubits in a cavity | 11 pages, 4 figures. Replaced with published version; made explicit
connection with finite LMG model | New J. Phys. 10, 113020 (2008) | 10.1088/1367-2630/10/11/113020 | null | quant-ph cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A fully-connected qubit network is considered, where every qubit interacts
with every other one. When the interactions between the qubits are homogeneous,
the system is a special case of the finite Lipkin-Meshkov-Glick model. We
propose a natural implementation of this model using superconducting qubits in
state-of-the-art circuit QED. The ground state, the low-lying energy spectrum
and the dynamical evolution are investigated. We find that, under realistic
conditions, highly entangled states of Greenberger-Horne-Zeilinger and W types
can be generated. We also comment on the influence of disorder on the system
and discuss the possibility of simulating complex quantum systems, such as
Sherrington-Kirkpatrick spin glasses, with superconducting qubit networks.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:35:24 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Oct 2008 10:05:14 GMT"
}
] | 2008-11-15T00:00:00 | [
[
"Tsomokos",
"D. I.",
""
],
[
"Ashhab",
"S.",
""
],
[
"Nori",
"F.",
""
]
] | [
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] |
802.147 | Taku Izubuchi | Taku Izubuchi, Sinya Aoki, Koichi Hashimoto, Yoshifumi Nakamura, Toru
Sekido, Gerrit Schierholz | Dynamical QCD simulation with theta terms | 8 pages, 3 figures, talk given by Taku Izubuchi at the XXV
International Symposium on Lattice Field Theory, Regensburg, Germany, 30 July
- 4 August 2007 | PoSLAT2007:106,2007 | null | null | hep-lat | null | The theta term that breaks the Strong CP symmetry is introduced in the two
flavors of dynamical QCD simulation. theta is analytically continued to a pure
imaginary number to make the probability of Monte Carlo positive. The Neutron's
Electric Dipole Moment (NEDM) is measured on the ensemble under a uniform and
week electric field. Other applications of theta terms are also discussed.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:35:43 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 22:47:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Izubuchi",
"Taku",
""
],
[
"Aoki",
"Sinya",
""
],
[
"Hashimoto",
"Koichi",
""
],
[
"Nakamura",
"Yoshifumi",
""
],
[
"Sekido",
"Toru",
""
],
[
"Schierholz",
"Gerrit",
""
]
] | [
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] |
802.1471 | Ronald de Wolf | Ronald de Wolf (CWI Amsterdam) | Error-Correcting Data Structures | 15 pages LaTeX; an abridged version will appear in the Proceedings of
the STACS 2009 conference | null | null | null | cs.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study data structures in the presence of adversarial noise. We want to
encode a given object in a succinct data structure that enables us to
efficiently answer specific queries about the object, even if the data
structure has been corrupted by a constant fraction of errors. This new model
is the common generalization of (static) data structures and locally decodable
error-correcting codes. The main issue is the tradeoff between the space used
by the data structure and the time (number of probes) needed to answer a query
about the encoded object. We prove a number of upper and lower bounds on
various natural error-correcting data structure problems. In particular, we
show that the optimal length of error-correcting data structures for the
Membership problem (where we want to store subsets of size s from a universe of
size n) is closely related to the optimal length of locally decodable codes for
s-bit strings.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:35:49 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Dec 2008 14:25:48 GMT"
}
] | 2008-12-01T00:00:00 | [
[
"de Wolf",
"Ronald",
"",
"CWI Amsterdam"
]
] | [
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802.1472 | Arnoldas Deltuva | A. Deltuva, A. C. Fonseca, S. K. Bogner | Low-momentum interactions in three- and four-nucleon scattering | 5 pages, 8 figures, to be published in Phys. Rev. C | Phys.Rev.C77:024002,2008 | 10.1103/PhysRevC.77.024002 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low momentum two-nucleon interactions obtained with the renormalization group
method and the similarity renormalization group method are used to study the
cutoff dependence of low energy 3N and 4N scattering observables. The residual
cutoff dependence arises from omitted short-ranged 3N (and higher) forces that
are induced by the renormalization group transformations, and may help to
estimate the sensitivity of various 3N and 4N scattering observables to
short-ranged many-body forces.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:38:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Deltuva",
"A.",
""
],
[
"Fonseca",
"A. C.",
""
],
[
"Bogner",
"S. K.",
""
]
] | [
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802.1473 | Benjamin McKay | Benjamin McKay | Morphisms of Cartan connections | 61 pages | null | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define what we call morphisms of Cartan connections. We generalize the
main theorems on Cartan connections to theorems on morphisms. Many of the known
constructions involving Cartan connections turn out to be examples of
morphisms. We prove some basic results concerning completeness of Cartan
connections. We provide a new method to prove completeness of Cartan
connections using families of morphisms.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:42:14 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Dec 2009 12:19:15 GMT"
},
{
"version": "v3",
"created": "Tue, 28 Sep 2010 13:45:04 GMT"
}
] | 2010-09-29T00:00:00 | [
[
"McKay",
"Benjamin",
""
]
] | [
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] |
802.1474 | Ramachandran Gowravaram | J.Balasubramanyam, Venkataraya and G. Ramachandran | Omega meson production in pp collisions with a polarized beam | 5 pages, Latex 2e | Phys.Rev.C78:012201,2008 | 10.1103/PhysRevC.78.012201 | GVKA-1(2008) | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Model independent formulae are derived for the beam analyzing power $A_y$ and
beam to meson spin transfers in $pp \to pp \omega$ taking into consideration
all the six threshold partial wave amplitudes covering the $Ss, Sp$ and $Ps$
channels. Attention is also focussed on the empirical determination of the
lowest three partial wave amplitudes $f_1, f_2, f_3$ without any discrete
ambiguities.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:44:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Balasubramanyam",
"J.",
""
],
[
"Venkataraya",
"",
""
],
[
"Ramachandran",
"G.",
""
]
] | [
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] |
802.1475 | Nicolas Sangouard | Nicolas Sangouard, Christoph Simon, Bo Zhao, Yu-Ao Chen, Hugues de
Riedmatten, Jian-Wei Pan, and Nicolas Gisin | Robust and Efficient Quantum Repeaters with Atomic Ensembles and Linear
Optics | 7 pages, 3 figures, accepted version (to appear in Phys. Rev. A) | Phys. Rev. A 77, 062301 (2008) | 10.1103/PhysRevA.77.062301 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the last few years there has been a lot of interest in quantum repeater
protocols using only atomic ensembles and linear optics. Here we show that the
local generation of high-fidelity entangled pairs of atomic excitations, in
combination with the use of two-photon detections for long-distance
entanglement generation, permits the implementation of a very attractive
quantum repeater protocol. Such a repeater is robust with respect to phase
fluctuations in the transmission channels, and at the same time achieves higher
entanglement generation rates than other protocols using the same ingredients.
We propose an efficient method of generating high-fidelity entangled pairs
locally, based on the partial readout of the ensemble-based memories. We also
discuss the experimental implementation of the proposed protocol.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:53:05 GMT"
},
{
"version": "v2",
"created": "Tue, 13 May 2008 12:55:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sangouard",
"Nicolas",
""
],
[
"Simon",
"Christoph",
""
],
[
"Zhao",
"Bo",
""
],
[
"Chen",
"Yu-Ao",
""
],
[
"de Riedmatten",
"Hugues",
""
],
[
"Pan",
"Jian-Wei",
""
],
[
"Gisin",
"Nicolas",
""
]
] | [
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] |
802.1476 | Dietrich Stauffer | F.W.S. Lima | Simulation of majority rule disturbed by power-law noise on directed and
undirected Barabasi-Albert networks | 6 pages including many figures, for Int. J. Mod. Phys. C | null | 10.1142/S0129183108012686 | null | cond-mat.dis-nn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On directed and undirected Barabasi-Albert networks the Ising model with spin
S=1/2 in the presence of a kind of noise is now studied through Monte Carlo
simulations. The noise spectrum P(n) follows a power law, where P(n) is the
probability of flipping randomly select n spins at each time step. The noise
spectrum P(n) is introduced to mimic the self-organized criticality as a model
influence of a complex environment. In this model, different from the square
lattice, the order-disorder phase transition of the order parameter is not
observed. For directed Barabasi-Albert networks the magnetisation tends to zero
exponentially and for undirected Barabasi-Albert networks, it remains constant.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:05:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lima",
"F. W. S.",
""
]
] | [
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] |
802.1477 | Paul Incani | E. B. Davies, Paul A. Incani | Spectral Properties of Matrices Associated with Some Directed Graphs | 41 pages, 9 figures | null | null | null | math.SP | null | We study the spectral properties of certain non-self-adjoint matrices
associated with large directed graphs. Asymptotically the eigenvalues converge
to certain curves, apart from a finite number that have limits not on these
curves.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:16:26 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Davies",
"E. B.",
""
],
[
"Incani",
"Paul A.",
""
]
] | [
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] |
802.1478 | Malwina J. Luczak | A. D. Barbour, M. J. Luczak | Laws of large numbers for epidemic models with countably many types | Published in at http://dx.doi.org/10.1214/08-AAP521 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 6, 2208-2238 | 10.1214/08-AAP521 | IMS-AAP-AAP521 | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In modeling parasitic diseases, it is natural to distinguish hosts according
to the number of parasites that they carry, leading to a countably infinite
type space. Proving the analogue of the deterministic equations, used in models
with finitely many types as a "law of large numbers" approximation to the
underlying stochastic model, has previously either been done case by case,
using some special structure, or else not attempted. In this paper we prove a
general theorem of this sort, and complement it with a rate of convergence in
the $\ell_1$-norm.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:09:38 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 09:29:50 GMT"
},
{
"version": "v3",
"created": "Fri, 16 Jan 2009 08:42:23 GMT"
}
] | 2009-01-16T00:00:00 | [
[
"Barbour",
"A. D.",
""
],
[
"Luczak",
"M. J.",
""
]
] | [
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] |
802.1479 | Sait Umar | A.S. Umar and V.E. Oberacker | Density-constrained time-dependent Hartree-Fock calculation of
$^{16}$O+$^{208}$Pb fusion cross sections | 5 pages, 3 figures | Eur. Phys. J. A 39, 243 (2009) | 10.1140/epja/i2008-10712-5 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a fully microscopic study of the $^{16}$O+$^{208}$Pb fusion using
the density-constrained time-dependent Hartree-Fock theory. The calculated
fusion cross-sections are in good agreement with the experimental data for the
entire energy range indicating that the incorporation of dynamical effects is
crucial in describing heavy-ion fusion.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:15:07 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Nov 2008 20:03:58 GMT"
}
] | 2009-10-23T00:00:00 | [
[
"Umar",
"A. S.",
""
],
[
"Oberacker",
"V. E.",
""
]
] | [
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] |
802.148 | Chaouqi Misbah | V.I. Marchenko, Chaouqi Misbah | A plastic flow theory for amorphous materials | 4 pages, 1 figure | null | null | null | cond-mat.mtrl-sci cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from known kinematic picture for plasticity, we derive a set of
dynamical equations describing plastic flow in a Lagrangian formulation. Our
derivation is a natural and a straightforward extension of simple fluids,
elastic and viscous solids theories. These equations contain the Maxwell model
as a special limit. We discuss some results of plasticity which can be
described by this set of equations. We exploit the model equations for the
simple examples: straining of a slab and a rod. We find that necking manifests
always itself (not as a result of instability), except if the very special
constant-velocity stretching process is imposed.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:19:57 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Marchenko",
"V. I.",
""
],
[
"Misbah",
"Chaouqi",
""
]
] | [
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] |
802.1481 | Basudeb Dasgupta | Basudeb Dasgupta, Amol Dighe (Tata Inst., Mumbai), Alessandro Mirizzi
(Max Planck Inst., Munich) | Identifying neutrino mass hierarchy at extremely small theta(13) through
Earth matter effects in a supernova signal | Final version: Text clarified, references updated. Matches the
version published in Physical Review Letters | Phys.Rev.Lett.101:171801,2008 | 10.1103/PhysRevLett.101.171801 | MPP-2008-14; TIFR/TH/08-04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Collective neutrino flavor transformations deep inside a supernova are
sensitive to the neutrino mass hierarchy even at extremely small values of
theta(13). Exploiting this effect, we show that comparison of the antineutrino
signals from a galactic supernova in two megaton class water Cherenkov
detectors, one of which is shadowed by the Earth, will enable us to distinguish
between the hierarchies if sin^2 theta(13) < 10^{-5}. On the other hand, the
observation of Earth effects in the inverted hierarchy for sin^2 theta(13) >
10^{-3} will provide a robust observable signature of collective oscillations
occurring deep inside the supernova.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:34:13 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 20:20:40 GMT"
},
{
"version": "v3",
"created": "Mon, 20 Oct 2008 18:14:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dasgupta",
"Basudeb",
"",
"Tata Inst., Mumbai"
],
[
"Dighe",
"Amol",
"",
"Tata Inst., Mumbai"
],
[
"Mirizzi",
"Alessandro",
"",
"Max Planck Inst., Munich"
]
] | [
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] |
802.1482 | Sebastian Grab | M. A. Bernhardt, H. K. Dreiner, S. Grab, P. Richardson | Single Slepton Production in association with a single Top Quark at the
Tevatron and LHC | 13 pages, 12 figures; references added, minor changes | Phys.Rev.D78:015016,2008 | 10.1103/PhysRevD.78.015016 | BONN-TH-2007-08, CERN-PH-TH-2007-028, DCPT/08/16, IPPP/08/08 | hep-ph hep-ex | null | We calculate the total cross section for single charged slepton production in
association with a top quark at hadron colliders in the baryon triality (B$_3$)
supersymmetric model. We compute event rates for the Tevatron and LHC. We study
the signatures for different supersymmetric scenarios including neutralino and
stau LSPs. We perform a detailed analysis with basic cuts for the B$_3$
operator $\lam^\prime_{231}$ using Monte Carlo simulations to show that the
signal can be distinguished from the background at the LHC. In particular we
employ the resulting lepton charge asymmetry.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:57:03 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Mar 2008 13:45:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bernhardt",
"M. A.",
""
],
[
"Dreiner",
"H. K.",
""
],
[
"Grab",
"S.",
""
],
[
"Richardson",
"P.",
""
]
] | [
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] |
802.1483 | Francisco Fernandez Dr. | Francisco M. Fernandez | Accurate eigenvalues of bounded oscillators | null | null | 10.1088/0031-8949/78/01/015003 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate accurate eigenvalues of a bounded oscillator by means of the
Riccati--Pad\'e method that is based on a rational approximation to a
regularized logarithmic derivative of the wavefunction. Sequences of roots of
Hankel determinants approach the model eigenvalues from below with remarkable
convergence rate.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:44:38 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Mar 2008 20:34:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fernandez",
"Francisco M.",
""
]
] | [
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] |
802.1484 | Huaxin Lin | Huaxin Lin and Zhuang Niu | Lifting KK-elements, asymptotical unitary equivalence and classification
of simple C*-algebras | The new version made a correction and removed a number of typos | null | null | null | math.OA math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $A$ and $C$ be two unital simple C*-algebas with tracial rank zero.
Suppose that $C$ is amenable and satisfies the Universal Coefficient Theorem.
Denote by ${{KK}}_e(C,A)^{++}$ the set of those $\kappa$ for which
$\kappa(K_0(C)_+\setminus\{0\})\subset K_0(A)_+\setminus\{0\}$ and
$\kappa([1_C])=[1_A]$. Suppose that $\kappa\in {KK}_e(C,A)^{++}.$
We show that there is a unital monomorphism $\phi: C\to A$ such that
$[\phi]=\kappa.$ Suppose that $C$ is a unital AH-algebra and $\lambda:
\mathrm{T}(A)\to \mathrm{T}_{\mathtt{f}}(C)$ is a continuous affine map for
which $\tau(\kappa([p]))=\lambda(\tau)(p)$ for all projections $p$ in all
matrix algebras of $C$ and any $\tau\in \mathrm{T}(A),$ where $\mathrm{T}(A)$
is the simplex of tracial states of $A$ and $\mathrm{T}_{\mathtt{f}}(C)$ is the
convex set of faithful tracial states of $C.$ We prove that there is a unital
monomorphism $\phi: C\to A$ such that $\phi$ induces both $\kappa$ and
$\lambda.$
Suppose that $h: C\to A$ is a unital monomorphism and $\gamma \in
\mathrm{Hom}(\Kone(C), \aff(A)).$ We show that there exists a unital
monomorphism $\phi: C\to A$ such that $[\phi]=[h]$ in ${KK}(C,A),$ $\tau\circ
\phi=\tau\circ h$ for all tracial states $\tau$ and the associated rotation map
can be given by $\gamma.$ Applications to classification of simple C*-algebras
are also given.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:48:13 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Feb 2008 18:16:19 GMT"
},
{
"version": "v3",
"created": "Mon, 10 Mar 2008 13:25:16 GMT"
}
] | 2008-03-10T00:00:00 | [
[
"Lin",
"Huaxin",
""
],
[
"Niu",
"Zhuang",
""
]
] | [
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0.046562653,
-0.0125745852,
0.0413593762,
-0.1422762573,
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] |
802.1485 | James Binney | James Binney (Oxford University) | Fitting orbits to tidal streams | 6 pages MNRAS in press | null | 10.1111/j.1745-3933.2008.00458.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent years have seen the discovery of many tidal streams through the
Galaxy. Relatively straightforward observations of a stream allow one to deduce
three phase-space coordinates of an orbit. An algorithm is presented that
reconstructs the missing phase-space coordinates from these data. The
reconstruction starts from assumed values of the Galactic potential and a
distance to one point on the orbit, but with noise-free data the condition that
energy be conserved on the orbit enables one to reject incorrect assumptions.
The performance of the algorithm is investigated when errors are added to the
input data that are comparable to those in published data for the streams of
Pal 5. It is found that the algorithm returns distances and proper motions that
are accurate to of order one percent, and enables one to reject quite
reasonable but incorrect trial potentials. In practical applications it will be
important to minimize errors in the input data, and there is considerable scope
for doing this.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:48:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Binney",
"James",
"",
"Oxford University"
]
] | [
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802.1486 | Alexey Gulov | A. N. Buryk, V. V. Skalozub | Neural network predictions for Z' boson within LEP2 data set of Bhabha
process | 12 pages, 6 figures; results of all the LEP2 collaborations were
analysed | null | null | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | The neural network approach is applied to search for the Z'-boson within the
LEP2 data set for e+ e- -> e+ e- scattering process. In the course of the
analysis, the data set is reduced by 20 percent. The axial-vector and vector
couplings of the Z' are estimated at 95 percent CL within a two-parameter fit.
The mass is determined to be 0.53-1.05 TeV. Comparisons with other results are
given.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:53:11 GMT"
},
{
"version": "v2",
"created": "Fri, 15 May 2009 16:09:06 GMT"
}
] | 2009-05-15T00:00:00 | [
[
"Buryk",
"A. N.",
""
],
[
"Skalozub",
"V. V.",
""
]
] | [
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] |
802.1487 | Sergey Favorov | S. Ju. Favorov | Sunyer-i-Balaguer's Almost Elliptic Functions and Yosida's Normal
Functions | 26 pages, Bibliography 21 item | Journal d'Anallyze Mathematique, v.104, (2008), 307-340 | null | null | math.CV math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of two classes of meromorphic functions in the
complex plane. The first one is the class of almost elliptic functions in the
sense of Sunyer-i-Balaguer. This is the class of meromorphic functions f such
that the family of shifts f(z+h) (h are complex numbers) is normal with respect
to the uniform convergence in the whole complex plane. Given two sequences of
complex numbers, we provide sufficient conditions for them to be zeros and
poles of some almost elliptic function. These conditions enable one to give
(for the first time) explicit non-trivial examples of almost elliptic
functions.
The second class was introduced by K.Yosida, who called it a class of normal
functions of the first category. This is the class of meromorphic functions f
such that the family of shifts f(z+h)is normal with respect to the uniform
convergence on compacta in the complex plane and no limit point of the family
is a constant function. We give necessary and sufficient conditions for two
sequences of complex numbers to be zeros and poles of some normal function of
the first category and obtain a parametric representation for this class in
terms of zeros and poles.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:55:23 GMT"
}
] | 2009-06-27T00:00:00 | [
[
"Favorov",
"S. Ju.",
""
]
] | [
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] |
802.1488 | Krzysztof Kulakowski | Krzysztof Kulakowski | Cops or robbers - a bistable society | 8 pages, 2 figures. Some misleading sentences are removed from
section 3 | Int. J. Mod. Phys. C 19 (2008) 1105 | 10.1142/S0129183108012753 | null | physics.soc-ph physics.comp-ph | null | The norm game described by Axelrod in 1985 was recently treated with the
master equation formalism. Here we discuss the equations, where {\it i)} those
who break the norm cannot punish and those who punish cannot break the norm,
{\it ii)} the tendency to punish is suppressed if the majority breaks the norm.
The second mechanism is new. For some values of the parameters the solution
shows the saddle-point bifurcation. Then, two stable solutions are possible,
where the majority breaks the norm or the majority punishes. This means, that
the norm breaking can be discontinuous, when measured in the social scale. The
bistable character is reproduced also with new computer simulations on the
Erd{\H o}s--R\'enyi directed network.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:56:03 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 16:40:59 GMT"
},
{
"version": "v3",
"created": "Mon, 25 Feb 2008 17:30:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kulakowski",
"Krzysztof",
""
]
] | [
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802.1489 | Ricard Tomas | H. Minakata, H. Nunokawa, R. Tomas, and J. W. F. Valle | Parameter Degeneracy in Flavor-Dependent Reconstruction of Supernova
Neutrino Fluxes | 28 pages, 37 figures, version with some improvements in the text and
some new references, conclusions unchanged, to appear in JCAP | JCAP 0812:006,2008 | 10.1088/1475-7516/2008/12/006 | IFIC/08-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine the possibility of reconstructing the initial fluxes of
supernova neutrinos emitted in a future core-collapse galactic supernova
explosion and detected in a Megaton-sized water Cherenkov detector. A novel key
element in our method is the inclusion, in addition to the total and the
average energies of each neutrino species, of a "pinching" parameter
characterizing the width of the distribution as a fit parameter. We uncover in
this case a continuous degeneracy in the reconstructed parameters of supernova
neutrino fluxes at the neutrinosphere. We analyze in detail the features of
this degeneracy and show how it occurs irrespective of the parametrization used
for the distribution function. Given that this degeneracy is real we briefly
comment on possible steps towards resolving it, which necessarily requires
going beyond the setting presented here.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 17:59:54 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Nov 2008 14:40:59 GMT"
}
] | 2009-09-17T00:00:00 | [
[
"Minakata",
"H.",
""
],
[
"Nunokawa",
"H.",
""
],
[
"Tomas",
"R.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | [
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802.149 | Michael Teper | Barak Bringoltz and Michael Teper | Closed k-strings in SU(N) gauge theories : 2+1 dimensions | 22 pages, 8 figures | Phys.Lett.B663:429-437,2008 | 10.1016/j.physletb.2008.04.052 | null | hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the ground state energies of closed k-strings in
(2+1)-dimensional SU(N) gauge theories, for N=4,5,6,8 and k=2,3,4. From the
dependence of the ground state energy on the string length, we infer that such
k-strings are described by an effective string theory that is in the same
bosonic universality class (Nambu-Goto) as the fundamental string. When we
compare the continuum k-string tensions to the corresponding fundamental string
tensions, we find that the ratios are close to, but typically 1-2 percent
above, the Casimir scaling values favoured by some theoretical approaches.
Fitting the N-dependence in a model-independent way favours an expansion in 1/N
(as in Casimir scaling) rather than the 1/N^2 that is suggested by naive colour
counting. We also observe that the low-lying spectrum of k-string states falls
into sectors that belong to particular irreducible representations of SU(N),
demonstrating that the dynamics of string binding knows about the full gauge
group and not just about its centre.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:04:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bringoltz",
"Barak",
""
],
[
"Teper",
"Michael",
""
]
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] |
802.1491 | Ruslan Sharipov | Ruslan Sharipov | On operator fields in the bundle of Dirac spinors | AmSTeX, 14 pages, amsppt style | null | null | null | math.DG math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Operator fields in the bundle of Dirac spinors and their conversion to
spatial fields are considered. Some commutator equations are studied with the
use of the conversion technique.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:10:12 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Sharipov",
"Ruslan",
""
]
] | [
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802.1492 | Jaroslaw Korbicz | J. K. Korbicz, J. Wehr, and M. Lewenstein | Entanglement and Quantum Groups | final version | J. Math. Phys. 50, 062104 (2009) | 10.1063/1.3143542 | null | quant-ph math.OA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe quantum mechanical entanglement in terms of compact quantum
groups. We prove an analog of positivity of partial transpose (PPT) criterion
and formulate a Horodecki-type Theorem.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:15:06 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Jun 2009 18:43:44 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Korbicz",
"J. K.",
""
],
[
"Wehr",
"J.",
""
],
[
"Lewenstein",
"M.",
""
]
] | [
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] |
802.1493 | Raphael Voituriez | C. Loverdo, O. Benichou, M. Moreau, R. Voituriez | Enhanced reaction kinetics in biological cells | 10 pages, 2 figures | Nature Physics 4, 134-137 (2008) | 10.1038/nphys830 | null | cond-mat.stat-mech q-bio.CB q-bio.QM | null | The cell cytoskeleton is a striking example of "active" medium driven
out-of-equilibrium by ATP hydrolysis. Such activity has been shown recently to
have a spectacular impact on the mechanical and rheological properties of the
cellular medium, as well as on its transport properties : a generic tracer
particle freely diffuses as in a standard equilibrium medium, but also
intermittently binds with random interaction times to motor proteins, which
perform active ballistic excursions along cytoskeletal filaments. Here, we
propose for the first time an analytical model of transport limited reactions
in active media, and show quantitatively how active transport can enhance
reactivity for large enough tracers like vesicles. We derive analytically the
average interaction time with motor proteins which optimizes the reaction rate,
and reveal remarkable universal features of the optimal configuration. We
discuss why active transport may be beneficial in various biological examples:
cell cytoskeleton, membranes and lamellipodia, and tubular structures like
axons.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:34:54 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Loverdo",
"C.",
""
],
[
"Benichou",
"O.",
""
],
[
"Moreau",
"M.",
""
],
[
"Voituriez",
"R.",
""
]
] | [
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802.1494 | Alejandro Rodriguez | Alejandro W. Rodriguez, John D. Joannopoulos, and Steven G. Johnson | Repulsive, nonmonotonic Casimir forces in a glide-symmetric geometry | null | Physical Review A, Vol. 77, No. 6, 062107 (2008) | 10.1103/PhysRevA.77.062107 | null | physics.optics physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a three-dimensional geometry that exhibits a repulsive Casimir
force using ordinary metallic materials, as computed via an exact numerical
method (no uncontrolled approximations). The geometry consists of a zippelike,
glide-symmetric structure formed of interleaved metal brackets attached to
parallel plates. Depending on the separation, the perpendicular force between
the plates/brackets varies from attractive (large separations) to repulsive
(intermediate distances) and back to attractive (close separations), with one
point of stable equilibrium in the perpendicular direction. This geometry was
motivated by a simple intuition of attractive interactions between surfaces,
and so we also consider how a rough proximity force approximation of pairwise
attractions compares to the exact calculations.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:26:00 GMT"
}
] | 2011-01-25T00:00:00 | [
[
"Rodriguez",
"Alejandro W.",
""
],
[
"Joannopoulos",
"John D.",
""
],
[
"Johnson",
"Steven G.",
""
]
] | [
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802.1495 | Brendan Owens | Brendan Owens, Saso Strle | A characterisation of the Z^n + Z(\delta) lattice and definite
nonunimodular intersection forms | 21 pages, 1 figure | null | null | null | math.GT math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove a generalisation of Elkies' theorem to nonunimodular definite forms
(and lattices). Combined with inequalities of Froyshov and of Ozsvath and
Szabo, this gives a simple test of whether a rational homology 3-sphere may
bound a definite four-manifold. As an example we show that small positive
surgeries on torus knots do not bound negative-definite four-manifolds.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:37:18 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Owens",
"Brendan",
""
],
[
"Strle",
"Saso",
""
]
] | [
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802.1496 | Keqin Liu | Keqin Liu | Lie-like Algebras (Superalgeras) | 14 pages | null | null | null | math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the notion of a Lie-like algebra$^{\diamond}$
(superalgebra$^{\diamond}$) for $\diamond\in\{^{1-st}, ^{2-nd}, ^{3-rd} \}$.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:38:11 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Liu",
"Keqin",
""
]
] | [
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] |
802.1497 | Jacob Bernstein | Jacob Bernstein and Christine Breiner | Helicoid-Like Minimal Disks and Uniqueness | 17 pages, LaTex; substantially expanded and revised per referee's
suggestions; To appear J. Reine. Angew. Math | J. Reine Angew. Math. 655 (2011), 129-146 | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that an embedded minimal disk in R^3 with large curvature is
bilipschitz with a piece of a helicoid. Additionally, a simplified proof of the
uniqueness of the helicoid is provided.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:44:52 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Apr 2008 18:44:52 GMT"
},
{
"version": "v3",
"created": "Sat, 18 Dec 2010 19:32:19 GMT"
}
] | 2016-05-27T00:00:00 | [
[
"Bernstein",
"Jacob",
""
],
[
"Breiner",
"Christine",
""
]
] | [
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] |
802.1498 | Catherine Pepin | C. Pepin | Selective Mott transition and heavy fermions | 27 pages, 5 figures | Phys. Rev. B 77, 245129 (2008) | 10.1103/PhysRevB.77.245129 | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting with an extended version of the Anderson lattice where the
f-electrons are allowed a weak dispersion, we examine the possibility of a Mott
localization of the f-electrons, for a finite value of the hybridization $V$.
We study the fluctuations at the quantum critical point (QCP) where the
f-electrons localize. We find they are in the same universality class as for
the Kondo breakdown QCP, with the following notable features.
The quantum critical regime sees the appearance of an additional energy scale
separating two universality classes. In the low energy regime, the fluctuations
are dominated by massless gauge modes, while in the intermediate energy regime,
the fluctuations of the modulus of the order parameter are the most relevant
ones. In the latter regime, electric transport simplifies drastically, leading
to a quasi-linear resistivity in 3D and anomalous exponents lower than T in 2
D. This rather unique feature of the quantum critical regime enables us to make
experimentally testable predictions.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:46:41 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 16:31:36 GMT"
},
{
"version": "v3",
"created": "Tue, 8 Jul 2008 15:54:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pepin",
"C.",
""
]
] | [
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802.1499 | Krzysztof Suchecki | Krzysztof Suchecki, Janusz A. Holyst | First order phase transition in Ising model on two connected
Barabasi-Albert networks | 6 pages, 8 figures | null | null | null | cond-mat.dis-nn cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the behavior of the Ising model on two connected
Barabasi-Albert scale-free networks. We extend previous analysis and show that
a first order temperature-driven phase transition occurs in such system. The
transition between antiparalelly ordered networks to paralelly ordered networks
is shown to be discontinuous. We calculate the critical temperature. We confirm
the calculations with numeric simulations using Monte-Carlo methods.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:48:27 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Suchecki",
"Krzysztof",
""
],
[
"Holyst",
"Janusz A.",
""
]
] | [
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] |
802.15 | Woo-Sung Jung | Cheoljun Eom, Woo-Sung Jung, Sunghoon Choi, Gabjin Oh, Seunghwan Kim | Effects of time dependency and efficiency on information flow in
financial markets | null | Physica A 387(21), 5219-5224 (2008) | 10.1016/j.physa.2008.05.054 | null | q-fin.ST physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated financial market data to determine which factors affect
information flow between stocks. Two factors, the time dependency and the
degree of efficiency, were considered in the analysis of Korean, the Japanese,
the Taiwanese, the Canadian, and US market data. We found that the frequency of
the significant information decreases as the time interval increases. However,
no significant information flow was observed in the time series from which the
temporal time correlation was removed. These results indicated that the
information flow between stocks evidences time-dependency properties.
Furthermore, we discovered that the difference in the degree of efficiency
performs a crucial function in determining the direction of the significant
information flow.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:56:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Eom",
"Cheoljun",
""
],
[
"Jung",
"Woo-Sung",
""
],
[
"Choi",
"Sunghoon",
""
],
[
"Oh",
"Gabjin",
""
],
[
"Kim",
"Seunghwan",
""
]
] | [
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] |
802.1501 | Pierre Kervella | Pierre Kervella (LESIA), Antoine M\'erand (CHARA), Laszlo Szabados,
Pascal Fouqu\'e (OMP), David Bersier, Emanuela Pompei (ESO), Guy Perrin
(LESIA) | The long-period Galactic Cepheid RS Puppis - I. A geometric distance
from its light echoes | 14 pages in electronic form. Astronomy and Astrophysics (2007) in
press | null | 10.1051/0004-6361:20078961 | null | astro-ph | null | Context: The bright southern Cepheid RS Pup is surrounded by a circumstellar
nebula reflecting the light from the central star. The propagation of the light
variations from the Cepheid inside the dusty nebula creates spectacular light
echoes that can be observed up to large distances from the star itself. This
phenomenon is currently unique in this class of stars. Aims: For this
relatively distant star, the trigonometric parallax available from Hipparcos
has a low accuracy. A careful observation of the light echoes has the potential
to provide a very accurate, geometric distance to RS Pup. Methods: We obtained
a series of CCD images of RS Pup with the NTT/EMMI instrument, covering the
variation period of the star (P=41.4d). This allowed us to track the
progression of the light wavefronts over the nebular features surrounding the
star. We measured precisely the phase lag of the photometric variation in
several regions of the circumstellar nebula. Results: From our phase lag
measurements, we derived a geometric distance of 1992 +/- 28 pc to RS Pup. This
distance is affected by a total uncertainty of 1.4%, and corresponds to a
parallax of pi = 0.502 +/- 0.007 mas and a distance modulus of mu = 11.50 +/-
0.03. Conclusions: The geometric distance we derived is by far the most
accurate to a Cepheid, and among the most accurate to any star. RS Pup appears
both as somewhat neglected and particularly promising to investigate the
mass-loss history of Cepheids. Thanks to its highly accurate distance, it is
also bound to become an important luminosity fiducial for the long period part
of the period-luminosity diagram.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 18:59:08 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Kervella",
"Pierre",
"",
"LESIA"
],
[
"Mérand",
"Antoine",
"",
"CHARA"
],
[
"Szabados",
"Laszlo",
"",
"OMP"
],
[
"Fouqué",
"Pascal",
"",
"OMP"
],
[
"Bersier",
"David",
"",
"ESO"
],
[
"Pompei",
"Emanuela",
"",
"ESO"
],
[
"Perrin",
"Guy",
"",
"LESIA"
]
] | [
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] |
802.1502 | Pierre-Emmanuel Peyneau | Pierre-Emmanuel Peyneau (LMSGC), Jean-No\"el Roux (LMSGC) | Frictionless bead packs have macroscopic friction, but no dilatancy | 19 pages. Additional technical details may be found in v1 | Physical Review E: Statistical, Nonlinear, and Soft Matter Physics
78 (2008) 011307 | 10.1103/PhysRevE.78.011307 | null | cond-mat.mtrl-sci cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The statement of the title is shown by numerical simulation of homogeneously
sheared packings of frictionless, nearly rigid beads in the quasistatic limit.
Results coincide for steady flows at constant shear rate γ in the
limit of small γ and static approaches, in which packings are equilibrated
under growing deviator stresses. The internal friction angle ϕ, equal to
5.76 $\pm$ 0.22 degrees in simple shear, is independent on the average pressure
P in the rigid limit. It is shown to stem from the ability of stable
frictionless contact networks to form stress-induced anisotropic fabrics. No
enduring strain localization is observed. Dissipation at the macroscopic level
results from repeated network rearrangements, like the effective friction
of a frictionless slider on a bumpy surface. Solid fraction Φ remains
equal to the random close packing value ≃ 0.64 in slowly or statically
sheared systems. Fluctuations of stresses and volume are observed to regress in
the large system limit, and we conclude that the same friction law for simple
shear applies in the large psystem limit if normal stress or density is
externally controlled. Defining the inertia number as I = γ m/(aP),
with m the grain mass and a its diameter, both internal friction
coefficient $\mu$∗ = tan ϕ and volume 1/Φ increase as
powers of I in the quasistatic limit of vanishing I, in which all mechanical
properties are determined by contact network geometry. The microstructure of
the sheared material is characterized with a suitable parametrization of the
fabric tensor and measurements of connectivity and coordination numbers
associated with contacts and near neighbors.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:00:04 GMT"
},
{
"version": "v2",
"created": "Wed, 3 Sep 2008 12:51:14 GMT"
}
] | 2008-09-03T00:00:00 | [
[
"Peyneau",
"Pierre-Emmanuel",
"",
"LMSGC"
],
[
"Roux",
"Jean-Noël",
"",
"LMSGC"
]
] | [
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