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list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.1314 | Alessandro Melchiorri dr. | Alessandro Melchiorri, Luca Pagano, Stefania Pandolfi | When Did Cosmic Acceleration Start ? | 5 pages, 2 figures | Phys.Rev.D76:041301,2007 | 10.1103/PhysRevD.76.041301 | null | astro-ph gr-qc hep-ph | null | A precise determination, and comparison, of the epoch of the onset of cosmic
acceleration, at redshift z_acc, and of dark energy domination, at z_eq,
provides an interesting measure with which to parameterize dark energy models.
By combining several cosmological datasets we place constraints on the redshift
and age of cosmological acceleration. For a Lambda-CDM model, we find the
constraint z_acc=0.76\pm0.10 at 95% c.l., occurring 6.7\pm0.4 Gyrs ago.
Allowing a constant equation of state but different from -1 changes the
constraints to z_acc=0.81\pm0.12 (6.9\pm0.5 Gyrs ago) and
z_eq=0.48\pm0.14(4.9\pm0.9 Gyrs ago), while dynamical models markedly increase
the error on the constraints with z_acc=0.81\pm0.30 (6.8\pm1.4 Gyrs ago) and
z_eq=0.44\pm0.20 (4.5\pm1.0 Gyrs ago). Unified dark energy models as Silent
Quartessence yield: z_acc=0.80\pm0.16 (6.8\pm0.6 Gyrs ago).
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 13:59:11 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Melchiorri",
"Alessandro",
""
],
[
"Pagano",
"Luca",
""
],
[
"Pandolfi",
"Stefania",
""
]
] |
0706.1315 | Alain Bachelot | Alain Bachelot | The Dirac system on the Anti-de Sitter Universe | 33 pages | Commun.Math.Phys.283:127-167,2008 | 10.1007/s00220-008-0564-8 | null | math-ph math.AP math.MP | null | We investigate the global solutions of the Dirac equation on the
Anti-de-Sitter Universe. Since this space is not globally hyperbolic, the
Cauchy problem is not, {\it a priori}, well-posed. Nevertheless we can prove
that there exists unitary dynamics, but its uniqueness crucially depends on the
ratio beween the mass $M$ of the field and the cosmological constant
$\Lambda>0$ : it appears a critical value, $\Lambda/12$, which plays a role
similar to the Breitenlohner-Freedman bound for the scalar fields. When
$M^2\geq \Lambda/12$ there exists a unique unitary dynamics. In opposite, for
the light fermions satisfying $M^2<\Lambda/12$, we construct several asymptotic
conditions at infinity, such that the problem becomes well-posed. In all the
cases, the spectrum of the hamiltonian is discrete. We also prove a result of
equipartition of the energy.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 15:38:15 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jul 2007 13:55:00 GMT"
},
{
"version": "v3",
"created": "Mon, 25 Feb 2008 11:10:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bachelot",
"Alain",
""
]
] |
0706.1316 | Andrea Alu | Andrea Alu, Alessandro Salandrino, Nader Engheta | Coupling of Optical Lumped Nanocircuit Elements and Effects of
Substrates | 21 pages, 4 figures, under review | null | 10.1364/OE.15.013865 | null | cond-mat.mtrl-sci | null | We present here a model for the coupling among small nanoparticles excited by
an optical electric field in the framework of our optical lumped nanocircuit
theory [N. Engheta, A. Salandrino, and A. Alu Phys. Rev. Lett. 95, 095504
(2005)]. We derive how this coupling affects the corresponding nanocircuit
model by adding controlled sources that depend on the optical voltages applied
on the coupled particles. With the same technique, we can model also the
presence of a substrate underneath nanocircuit elements, relating its presence
to the coupling with a properly modeled image nanoparticle. These results are
of importance in the understanding and the design of complex optical
nanocircuits at infrared and optical frequencies.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 15:45:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alu",
"Andrea",
""
],
[
"Salandrino",
"Alessandro",
""
],
[
"Engheta",
"Nader",
""
]
] |
0706.1317 | Jun Namikawa | Jun Namikawa and Jun Tani | A model for learning to segment temporal sequences, utilizing a mixture
of RNN experts together with adaptive variance | 18 pages, 11 figures | null | null | null | nlin.AO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper proposes a novel learning method for a mixture of recurrent neural
network (RNN) experts model, which can acquire the ability to generate desired
sequences by dynamically switching between experts. Our method is based on
maximum likelihood estimation, using a gradient descent algorithm. This
approach is similar to that used in conventional methods; however, we modify
the likelihood function by adding a mechanism to alter the variance for each
expert. The proposed method is demonstrated to successfully learn Markov chain
switching among a set of 9 Lissajous curves, for which the conventional method
fails. The learning performance, analyzed in terms of the generalization
capability, of the proposed method is also shown to be superior to that of the
conventional method. With the addition of a gating network, the proposed method
is successfully applied to the learning of sensory-motor flows for a small
humanoid robot as a realistic problem of time series prediction and generation.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 15:47:10 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jun 2008 04:05:59 GMT"
}
] | 2008-06-17T00:00:00 | [
[
"Namikawa",
"Jun",
""
],
[
"Tani",
"Jun",
""
]
] |
0706.1318 | John Tomlin | S. Sathiya Keerthi and John A. Tomlin | Constructing a maximum utility slate of on-line advertisements | null | null | null | YR-2007-001 | cs.DM cs.DS | null | We present an algorithm for constructing an optimal slate of sponsored search
advertisements which respects the ordering that is the outcome of a generalized
second price auction, but which must also accommodate complicating factors such
as overall budget constraints. The algorithm is easily fast enough to use on
the fly for typical problem sizes, or as a subroutine in an overall
optimization.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 16:18:45 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Keerthi",
"S. Sathiya",
""
],
[
"Tomlin",
"John A.",
""
]
] |
0706.1319 | Luis Lehner | Luis Lehner and Osvaldo M. Moreschi | Dealing with delicate issues in waveforms calculations | null | Phys.Rev.D76:124040,2007 | 10.1103/PhysRevD.76.124040 | null | gr-qc | null | We revisit the calculation of gravitational radiation through the use of Weyl
scalars. We point out several possible problems arising from gauge and tetrad
ambiguities and ways to address them. Our analysis indicates how, relatively
simple corrections can be introduced to remove these ambiguities.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 16:20:09 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lehner",
"Luis",
""
],
[
"Moreschi",
"Osvaldo M.",
""
]
] |
0706.1320 | Mariana Orellana | G. E. Romero, A. T. Okazaki, M. Orellana, S. P. Owocki | Accretion vs colliding wind models for the gamma-ray binary LS I +61
303: an assessment | Accepted for publication in A&A. The resolution of the figures is
lower than in the journal paper to minimize file sizes. Seven pages, 5
figures | A&A 474, 15 (2007) | 10.1051/0004-6361:20078035 | null | astro-ph | null | LS I +61 303 is a puzzling Be/X-ray binary with variable gamma-ray emission
at up TeV energies. The nature of the compact object and the origin of the
high-energy emission are unclear. One family of models invokes particle
acceleration in shocks from the collision between the B-star wind and a
relativistic pulsar wind, while another centers on a relativistic jet powered
by accretion. Recent high-resolution radio observations showing a putative
"cometary tail" pointing away from the Be star near periastron have been cited
as support for the pulsar-wind model. We wish here to carry out a quantitative
assessment of these competing models for this extraordinary source. We apply a
3D SPH code for dynamical simulations of both the pulsar-wind-interaction and
accretion-jet models. The former yields a description of the shape of the
wind-wind interaction surface. The latter provides an estimation of the
accretion rate. The results allow critical evaluation of how the two distinct
models confront the data in various wavebands under a range of conditions. When
one accounts for the 3D dynamical wind interaction under realistic constraints
for the relative strength of the B-star and pulsar winds, the resulting form of
the interaction front does not match the putative "cometary tail" claimed from
radio observations. On the other hand, dynamical simulations of the
accretion-jet model indicate that the orbital phase variation of accretion
power includes a secondary broad peak well away from periastron, thus providing
a plausible way to explain the observed TeV gamma ray emission toward apastron.
We conclude that the colliding-wind model is not clearly established for LS I
+61 303, while the accretion-jet model can reproduce many key characteristics
of the observed TeV gamma-ray emission.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 16:32:54 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 21:08:37 GMT"
}
] | 2007-10-03T00:00:00 | [
[
"Romero",
"G. E.",
""
],
[
"Okazaki",
"A. T.",
""
],
[
"Orellana",
"M.",
""
],
[
"Owocki",
"S. P.",
""
]
] |
0706.1321 | Alexander Jonathan van der Horst | A.J. van der Horst, A. Kamble, L. Resmi, R.A.M.J. Wijers, D.
Bhattacharya, B. Scheers, E. Rol, R. Strom, C. Kouveliotou, T. Oosterloo,
C.H. Ishwara-Chandra | Detailed study of the GRB 030329 radio afterglow deep into the
non-relativistic phase | 9 pages, 2 figures; accepted for publication in Astronomy &
Astrophysics after minor revisions; small changes in GMRT fluxes at 1280 MHz | null | 10.1051/0004-6361:20078051 | null | astro-ph | null | We explore the physics behind one of the brightest radio afterglows ever, GRB
030329, at late times when the jet is non-relativistic. We determine the
physical parameters of the blast wave and its surroundings, in particular the
index of the electron energy distribution, the energy of the blast wave, and
the density (structure) of the circumburst medium. We then compare our results
with those from image size measurements. We observed the GRB 030329 radio
afterglow with the Westerbork Synthesis Radio Telescope and the Giant Metrewave
Radio Telescope at frequencies from 325 MHz to 8.4 GHz, spanning a time range
of 268-1128 days after the burst. We modeled all the available radio data and
derived the physical parameters. The index of the electron energy distribution
is p=2.1, the circumburst medium is homogeneous, and the transition to the
non-relativistic phase happens at t_NR ~ 80 days. The energy of the blast wave
and density of the surrounding medium are comparable to previous findings. Our
findings indicate that the blast wave is roughly spherical at t_NR, and they
agree with the implications from the VLBI studies of image size evolution. It
is not clear from the presented dataset whether we have seen emission from the
counter jet or not. We predict that the Low Frequency Array will be able to
observe the afterglow of GRB 030329 and many other radio afterglows,
constraining the physics of the blast wave during its non-relativistic phase
even further.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 16:55:24 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Jan 2008 16:37:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"van der Horst",
"A. J.",
""
],
[
"Kamble",
"A.",
""
],
[
"Resmi",
"L.",
""
],
[
"Wijers",
"R. A. M. J.",
""
],
[
"Bhattacharya",
"D.",
""
],
[
"Scheers",
"B.",
""
],
[
"Rol",
"E.",
""
],
[
"Strom",
"R.",
""
],
[
"Kouveliotou",
"C.",
""
],
[
"Oosterloo",
"T.",
""
],
[
"Ishwara-Chandra",
"C. H.",
""
]
] |
0706.1322 | Nadia Sandoval-Figueroa | Nadia Sandoval-Figueroa and V\'ictor Romero-Roch\'in | Thermodynamics and the virial expansion for trapped fluids in arbitrary
external potentials | null | null | null | null | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the full thermodynamics of a fluid confined by an arbitrary
external potential based on the virial expansion of the grand potential. The
fluid may be classical or quantum and it is assumed that interatomic
interactions are pairwise additive. We indicate how the appropriate
"generalized" volume and pressure variables, that replace the usual volume and
hydrostatic pressure, emerge for a given confining potential in the
thermodynamic limit. A discussion of the physical meaning and of the
measurement of these variables is presented. We emphasize that this treatment
yields the correct equation of state of the fluid and we give its virial
expansion. We propose an experiment to measure the heat capacity, so that with
this quantity and the equation of state, the complete thermodynamics of the
system may be extracted. As a corollary, we find that the so-called {\it local
density approximation} for these systems follows in the thermodynamic limit,
although we also point out that it cannot be used indiscriminately for all
local variables. Along the text we discuss the relevance of these findings in
the description of the currently confined ultracold gases.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 17:14:01 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Aug 2008 23:38:01 GMT"
}
] | 2008-08-13T00:00:00 | [
[
"Sandoval-Figueroa",
"Nadia",
""
],
[
"Romero-Rochín",
"Víctor",
""
]
] |
0706.1323 | Alexander Jonathan van der Horst | A.J. van der Horst, A. Kamble, R.A.M.J. Wijers, L. Resmi, D.
Bhattacharya, E. Rol, R. Strom, C. Kouveliotou, T. Oosterloo, C.H.
Ishwara-Chandra | GRB 030329: 3 years of radio afterglow monitoring | 5 pages, 2 figures, Phil. Trans. R. Soc. A, vol.365, p.1241,
proceedings of the Royal Society Scientific Discussion Meeting, London,
September 2006 | null | 10.1098/rsta.2006.1993 | null | astro-ph | null | Radio observations of gamma-ray burst (GRB) afterglows are essential for our
understanding of the physics of relativistic blast waves, as they enable us to
follow the evolution of GRB explosions much longer than the afterglows in any
other wave band. We have performed a three-year monitoring campaign of GRB
030329 with the Westerbork Synthesis Radio Telescopes (WSRT) and the Giant
Metrewave Radio Telescope (GMRT). Our observations, combined with observations
at other wavelengths, have allowed us to determine the GRB blast wave physical
parameters, such as the total burst energy and the ambient medium density, as
well as investigate the jet nature of the relativistic outflow. Further, by
modeling the late-time radio light curve of GRB 030329, we predict that the
Low-Frequency Array (LOFAR, 30-240 MHz) will be able to observe afterglows of
similar GRBs, and constrain the physics of the blast wave during its
non-relativistic phase.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 17:27:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"van der Horst",
"A. J.",
""
],
[
"Kamble",
"A.",
""
],
[
"Wijers",
"R. A. M. J.",
""
],
[
"Resmi",
"L.",
""
],
[
"Bhattacharya",
"D.",
""
],
[
"Rol",
"E.",
""
],
[
"Strom",
"R.",
""
],
[
"Kouveliotou",
"C.",
""
],
[
"Oosterloo",
"T.",
""
],
[
"Ishwara-Chandra",
"C. H.",
""
]
] |
0706.1324 | Alexander Jonathan van der Horst | A.J. van der Horst, A. Kamble, R.A.M.J. Wijers, L. Resmi, D.
Bhattacharya, E. Rol, R. Strom, C. Kouveliotou, T. Oosterloo, C.H.
Ishwara-Chandra | GRB 030329: three years of radio afterglow monitoring | 2 pages, to appear in Nuovo Cimento B, proceedings of the Congress
"Swift and GRBs: Unveiling the Relativistic Universe", Venice, June 2006 | Nuovo Cim.B121:1605-1606,2006 | 10.1393/ncb/i2007-10327-5 | null | astro-ph | null | Radio observations of gamma-ray burst (GRB) afterglows are essential for our
understanding of the physics of relativistic blast waves, as they enable us to
follow the evolution of GRB explosions much longer than the afterglows in any
other wave band. We have performed a three-year monitoring campaign of GRB
030329 with the Westerbork Synthesis Radio Telescopes (WSRT) and the Giant
Metrewave Radio Telescope (GMRT). Our observations, combined with observations
at other wavelengths, have allowed us to determine the GRB blast wave physical
parameters, such as the total burst energy and the ambient medium density, as
well as investigate the jet nature of the relativistic outflow. Further, by
modeling the late-time radio light curve of GRB 030329, we predict that the Low
Frequency Array (LOFAR, 30-240 MHz) will be able to observe afterglows of
similar GRBs, and constrain the physics of the blast wave during its
non-relativistic phase.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 17:24:44 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"van der Horst",
"A. J.",
""
],
[
"Kamble",
"A.",
""
],
[
"Wijers",
"R. A. M. J.",
""
],
[
"Resmi",
"L.",
""
],
[
"Bhattacharya",
"D.",
""
],
[
"Rol",
"E.",
""
],
[
"Strom",
"R.",
""
],
[
"Kouveliotou",
"C.",
""
],
[
"Oosterloo",
"T.",
""
],
[
"Ishwara-Chandra",
"C. H.",
""
]
] |
0706.1325 | Giulio Magli | Giulio Magli | Possible astronomical references in the planning of the Great Hopewell
Road | Archaeoastronomy/History of Astronomy | null | null | null | physics.hist-ph | null | The possible existence of astronomical references in the planning of the
so-called Great Hopewell Road, a 90 Kilometres straight road composed of two
parallel earthen embankments which, according to recent surveys, likely
connected the Hopewell ceremonial centres of Newark and Chillicothe, Ohio, are
investigated. It turns out that a very peculiar, although simple, set of
astronomical alignments took place in connection with the road during possible
periods of its construction. The possibility of a non-fortuitous connection is
thus proposed and analysed.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 17:43:09 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Jun 2007 20:21:23 GMT"
},
{
"version": "v3",
"created": "Mon, 7 Apr 2008 07:46:30 GMT"
}
] | 2008-04-07T00:00:00 | [
[
"Magli",
"Giulio",
""
]
] |
0706.1326 | Jordi Lopez Abad | Jordi Lopez Abad (ELM), Lionel Nguyen Van Th\'e (ELM) | The oscillation stability problem for the Urysohn sphere: A
combinatorial approach | 19 pages | null | null | null | math.MG math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the oscillation stability problem for the Urysohn sphere, an analog
of the distortion problem for $\ell_2$ in the context of the Urysohn space
$\Ur$. In particular, we show that this problem reduces to a purely
combinatorial problem involving a family of countable ultrahomogeneous metric
spaces with finitely many distances.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 17:50:17 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Oct 2007 06:51:50 GMT"
},
{
"version": "v3",
"created": "Fri, 27 Feb 2009 15:10:56 GMT"
}
] | 2009-02-27T00:00:00 | [
[
"Abad",
"Jordi Lopez",
"",
"ELM"
],
[
"Van Thé",
"Lionel Nguyen",
"",
"ELM"
]
] |
0706.1327 | Richard Larson | R. L. Grossman, R. G. Larson | Hopf Algebras of Heap Ordered Trees and Permutations | 10 pages LaTeX, minor revision | null | null | null | math.RA | null | It is known that there is a Hopf algebra structure on the vector space with
basis all heap-ordered trees. We give a new bialgebra structure on the space
with basis all permutations and show that there is a direct bialgebra
isomorphism between the Hopf algebra of heap-ordered trees and the bialgebra of
permutations.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 20:57:32 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 15:01:14 GMT"
},
{
"version": "v3",
"created": "Wed, 14 Nov 2007 16:04:24 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Grossman",
"R. L.",
""
],
[
"Larson",
"R. G.",
""
]
] |
0706.1328 | F. Assaoui | F. Assaoui and T. Lhallabi | N = 4 Superfiel Phase Space Coordinates and Hamiltonian Quantization | 13 pages | null | null | IC/IR/2003/11 | hep-th | null | The N = 4 superfield phase space coordinates are given in the harmonic
superspace. The expressions of the N = 4 classical equations of motion are
determined in terms of the spinorial and harmonic supercharges. Furthermore,
the N = 4 supersymmetric actions are obtained by means of the fermionic and
harmonic functionals. On the other hand, the Hamiltonian quantization is
studied by performing the N = 4 supersymmetric action in harmonic subspace in
terms of analytic N = 4 superfield phase space coordinates.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 22:22:07 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Assaoui",
"F.",
""
],
[
"Lhallabi",
"T.",
""
]
] |
0706.1329 | Jeppe C. Dyre | Jeppe C. Dyre | Solidity of viscous liquids. V. Long-wavelength dominance of the
dynamics | null | Phys. Rev. E 76, 041508 (2007). | 10.1103/PhysRevE.76.041508 | null | cond-mat.soft | null | This paper is the fifth in a series exploring the physical consequences of
the solidity of glass-forming liquids. Paper IV proposed a model where the
density field is described by a time-dependent Ginzburg-Landau equation of the
nonconserved type with rates in $k$ space of the form $\Gamma_0+Dk^2$. The
model assumes that $D\gg\Gamma_0a^2$ where $a$ is the average intermolecular
distance; this inequality expresses a long-wavelength dominance of the dynamics
which implies that the Hamiltonian (free energy) to a good approximation may be
taken to be ultralocal. In the present paper we argue that this is the simplest
model consistent with the following three experimental facts: 1) Viscous
liquids approaching the glass transition do not develop long-range order; 2)
The glass has lower compressibility than the liquid; 3) The alpha process
involves several decades of relaxation times shorter than the mean relaxation
time. The paper proceeds to list six further experimental facts characterizing
equilibrium viscous liquid dynamics and shows that these are readily understood
in terms of the model; some are direct consequences, others are quite natural
when viewed in light of the model.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 18:07:18 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Jun 2007 12:17:58 GMT"
},
{
"version": "v3",
"created": "Sun, 26 Aug 2007 20:14:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dyre",
"Jeppe C.",
""
]
] |
0706.1330 | Mensur Omerbashich | M. Omerbashich | Note on: Considering the Case for Biodiversity Cycles: Reexamining the
Evidence for Periodicity in the Fossil Record, by Lieberman and Melott, arXiv
preprint 0704.2896 | A one-page note. For the supplementary information for this note,
including the cited Reply and Errata, see math-ph/0608014 | null | null | null | q-bio.PE astro-ph physics.geo-ph | null | Lieberman and Melott built their recent arXiv preprint 0704.2896 on my
published paper and (a preprint of) a subsequent comment by Liebermans
associate Cornette. But had this group waited for the Cornette comment to
actually appear in print together with the expected Reply, they would have
learned that his comment exposes Cornettes confusion that likely was due to
journal misprint of my figure. Thus 0704.2896 is baseless. Despite receiving
the extended Reply with Errata, these authors still fail to recognize that
detrending of paleontological records-which they erroneously promote as a
must-is an arbitrary rather than a universal operation.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 23:19:27 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Omerbashich",
"M.",
""
]
] |
0706.1331 | German Andres Enciso | German A. Enciso | On a Smale Theorem and Nonhomogeneous Equilibria in Cooperative Systems | 12 pages | null | null | null | math.DS math.AP | null | A standard result by Smale states that n dimensional strongly cooperative
dynamical systems can have arbitrary dynamics when restricted to unordered
invariant hyperspaces. In this paper this result is extended to the case when
all solutions of the strongly cooperative system are bounded and converge
towards one of only two equilibria outside of the hyperplane.
An application is given in the context of strongly cooperative systems of
reaction diffusion equations. It is shown that such a system can have a
continuum of spatially inhomogeneous steady states, even when all solutions of
the underlying reaction system converge to one of only three equilibria.
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 23:22:12 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Enciso",
"German A.",
""
]
] |
0706.1332 | Gerald Cecil | G. Cecil and J. A. Rose | Constraints on Galaxy Structure and Evolution from the Light of Nearby
Systems | pdfLaTeX 79 pages, 18 reduced quality figures; revised V2 to correct
typos, incorporate journal edits, and fix botched line types in Fig. 9 | Rept.Prog.Phys.70:1177,2007; Erratum-ibid.70:1715,2007 | 10.1088/0034-4885/70/7/R04 10.1088/0034-4885/70/10/C01 | null | astro-ph | null | We review knowledge of galaxy structures obtained by their emitted light and
in the local universe where they can be studied in great detail. We discuss the
shapes of, and stellar motions within, galaxies, compositional clues derived
from their spectra, and what luminous matter implies about their dark matter
content. Implications on the current theory of hierarchical galaxy formation
are explored.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 17:40:04 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 18:41:41 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Cecil",
"G.",
""
],
[
"Rose",
"J. A.",
""
]
] |
0706.1333 | Boris Shoikhet | Boris Shoikhet | An explicit construction of the Quillen homotopical category of dg Lie
algebras | LaTeX, 17 pages | null | null | null | math.KT math.QA | null | Let $\g_1$ and $\g_2$ be two dg Lie algebras, then it is well-known that the
$L_\infty$ morphisms from $\g_1$ to $\g_2$ are in 1-1 correspondence to the
solutions of the Maurer-Cartan equation in some dg Lie algebra
$\Bbbk(\g_1,\g_2)$. Then the gauge action by exponents of the zero degree
component $\Bbbk(\g_1,\g_2)^0$ on $MC\subset\Bbbk(\g_1,\g_2)^1$ gives an
explicit "homotopy relation" between two $L_\infty$ morphisms. We prove that
the quotient category by this relation (that is, the category whose objects are
$L_\infty$ algebras and morphisms are $L_\infty$ morphisms modulo the gauge
relation) is well-defined, and is a localization of the category of dg Lie
algebras and dg Lie maps by quasi-isomorphisms. As localization is unique up to
an equivalence, it is equivalent to the Quillen-Hinich homotopical category of
dg Lie algebras [Q1,2], [H1,2]. Moreover, we prove that the Quillen's concept
of a homotopy coincides with ours. The last result was conjectured by
V.Dolgushev [D].
| [
{
"version": "v1",
"created": "Sat, 9 Jun 2007 23:55:50 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Shoikhet",
"Boris",
""
]
] |
0706.1334 | Takayuki Tatekawa | Takayuki Tatekawa and Shuntaro Mizuno | Transients from initial conditions based on Lagrangian perturbation
theory in N-body simulations | 21 pages, 5 figures; accepted for publication in JCAP | JCAP 0712:014,2007 | 10.1088/1475-7516/2007/12/014 | WU-AP/268/07 | astro-ph | null | We explore the initial conditions for cosmological N-body simulations
suitable for calculating the skewness and kurtosis of the density field. In
general, the initial conditions based on the perturbation theory (PT) provide
incorrect second-order and higher-order growth. These errors implied by the use
of the perturbation theory to set up the initial conditions in N-body
simulations are called transients. Unless these transients are completely
suppressed compared with the dominant growing mode, we can not reproduce the
correct evolution of cumulants with orders higher than two, even though there
is no problem with the numerical scheme. We investigate the impact of
transients on the observable statistical quantities by performing $N$-body
simulations with initial conditions based on Lagrangian perturbation theory
(LPT). We show that the effects of transients on the kurtosis from the initial
conditions, based on second-order Lagrangian perturbation theory (2LPT) have
almost disappeared by $z\sim5$, as long as the initial conditions are set at $z
> 30$. This means that for practical purposes, the initial conditions based on
2LPT are accurate enough for numerical calculations of skewness and kurtosis.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 00:31:30 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 02:26:32 GMT"
},
{
"version": "v3",
"created": "Wed, 28 Nov 2007 01:39:07 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Tatekawa",
"Takayuki",
""
],
[
"Mizuno",
"Shuntaro",
""
]
] |
0706.1335 | Alexey Yamilov | Alexey Yamilov | Geometric mesoscopic correlations in quasi-one dimension | 5 pages, 4 figures | null | null | null | cond-mat.mes-hall cond-mat.dis-nn | null | We study analytically and numerically field/intensity correlations in wave
transport through volume-disordered waveguide. The obtained channel and spacial
correlations deviate from those found in framework of
Dorokhov-Mello-Pereyra-Kumar (DMPK) formalism, that we relate to
inapplicability of equivalent channel approximation in DMPK. We show that this
can be remedied by introducing boundary correction -- an escape function which
depends on the waveguide geometry -- that describes wave transport near a
boundary between random medium and free space. We obtain the expressions for
field/intensity channel and spacial correlation functions which agree with the
numerics and are consistent with the perturbative expressions in slab geometry
as well as experiments conducted in Q1D.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 02:49:57 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Yamilov",
"Alexey",
""
]
] |
0706.1336 | Adilson Enio Motter | Rafael D. Vilela and Adilson E. Motter | Can aerosols be trapped in open flows? | Animation available at
http://www.pks.mpg.de/~rdvilela/leapfrogging.html | Phys. Rev. Lett. 99, 264101 (2007) | 10.1103/PhysRevLett.99.264101 | null | nlin.CD astro-ph physics.flu-dyn | null | The fate of aerosols in open flows is relevant in a variety of physical
contexts. Previous results are consistent with the assumption that such
finite-size particles always escape in open chaotic advection. Here we show
that a different behavior is possible. We analyze the dynamics of aerosols both
in the absence and presence of gravitational effects, and both when the
dynamics of the fluid particles is hyperbolic and nonhyperbolic. Permanent
trapping of aerosols much heavier than the advecting fluid is shown to occur in
all these cases. This phenomenon is determined by the occurrence of multiple
vortices in the flow and is predicted to happen for realistic particle-fluid
density ratios.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 03:15:05 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 04:33:33 GMT"
}
] | 2008-01-22T00:00:00 | [
[
"Vilela",
"Rafael D.",
""
],
[
"Motter",
"Adilson E.",
""
]
] |
0706.1337 | Jiang-Hua Lu | Jiang-Hua Lu | A note on Poisson homogeneous spaces | null | null | null | null | math.DG math.SG | null | We identify the cotangent bundle Lie algebroid of a Poisson homogeneous space
G/H of a Poisson Lie group G as a quotient of a transformation Lie algebroid
over G. As applications, we describe the modular vector fields of G/H, and we
identify the Poisson cohomology of G/H with coefficients in powers of its
canonical line bundle with relative Lie algebra cohomology of the Drinfeld Lie
algebra associated to G/H. We also construct a Poisson groupoid over G/H which
is symplectic near the identity section. This note serves as preparation for
forthcoming papers, in which we will compute explicitly the Poisson cohomology
and study their symplectic groupoids for certain examples of Poisson
homogeneous spaces related to semi-simple Lie groups.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 04:14:18 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Lu",
"Jiang-Hua",
""
]
] |
0706.1338 | Ming Yu | Ming Yu and Xin Zhang | Supersymmetric Hamiltonian Approach to Edge Excitations in $\nu = 5/2$
Fractional Quantum Hall Effect | 22 pages, Corrected typos, discussions on the integrability, note
added | Nucl.Phys.B798:323-339,2008 | 10.1016/j.nuclphysb.2007.10.030 | null | hep-th cond-mat.mes-hall | null | A supersymmetric Hamiltonian is constructed for the edge excitations of the
Moore-Read (Pfaffian) like state, which is a realization of the N=2
supersymmetric CS model. Fermionic generators and their conjugates are
introduced to deal with the fermion pairing, whose condensation form a BCS like
state. After Bogoliubov transformation, a N=2 supersymmetric and
nonrelativistic Hamiltonian is found to take a known form, which is integrable.
The main difference between the Moore-Read state and our BCS like state is that
the number of fermion pairs in our formalism is not fixed. However, we have
also found that the excited states in our model looks similar but not exactly
the same as Moore and Read's.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 06:57:36 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Sep 2007 18:16:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yu",
"Ming",
""
],
[
"Zhang",
"Xin",
""
]
] |
0706.1339 | Giorgio Fabbri | G. Fabbri, F. Gozzi, A. Swiech | Verification theorem and construction of $\epsilon$-optimal controls for
control of abstract evolution equations | 28 pages | null | null | null | math.OC | null | We study several aspects of the dynamic programming approach to optimal
control of abstract evolution equations, including a class of semilinear
partial differential equations. We introduce and prove a verification theorem
which provides a sufficient condition for optimality. Moreover we prove sub-
and superoptimality principles of dynamic programming and give an explicit
construction of $\epsilon$-optimal controls.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 07:21:51 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Fabbri",
"G.",
""
],
[
"Gozzi",
"F.",
""
],
[
"Swiech",
"A.",
""
]
] |
0706.1340 | S. Sadeh | S. Sadeh, Y. Rephaeli, J. Silk | Cluster abundances and S-Z power spectra: effects of non-Gaussianity and
early dark energy | 12 pages, 5 figures, accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.380:637-645,2007 | 10.1111/j.1365-2966.2007.12091.x | null | astro-ph | null | In the standard Lambda CDM cosmological model with a Gaussian primordial
density fluctuation field, the relatively low value of the mass variance
parameter (sigma_8=0.74{+0.05}{-0.06}, obtained from the WMAP 3-year data)
results in a reduced likelihood that the measured level of CMB anisotropy on
the scales of clusters is due to the Sunyaev-Zeldovich (S-Z) effect. To assess
the feasibility of producing higher levels of S-Z power, we explore two
alternative models which predict higher cluster abundance. In the first model
the primordial density field has a chi^2_1 distribution, whereas in the second
an early dark energy component gives rise to the desired higher cluster
abundance. We carry out the necessary detailed calculations of the levels of
S-Z power spectra, cluster number counts, and angular 2-point correlation
function of clusters, and compare (in a self-consistent way) their predicted
redshift distributions. Our results provide a sufficient basis upon which the
viability of the three models may be tested by future high quality
measurements.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 07:40:01 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Sadeh",
"S.",
""
],
[
"Rephaeli",
"Y.",
""
],
[
"Silk",
"J.",
""
]
] |
0706.1341 | David Bugg | D.V. Bugg (Queen Mary, University of London, UK) | A Study in Depth of f0(1370) | 25 pages, 22 figures. Typos corrected in Eqs 2 and 7. Introduction
rewritten. Conclusions unchanged | Eur.Phys.J.C52:55-74,2007 | 10.1140/epjc/s10052-007-0389-1 | null | hep-ex | null | Claims have been made that f0(1370) does not exist. The five primary sets of
data requiring its existence are refitted. Major dispersive effects due to the
opening of the 4pi threshold are included for the first time; the sigma -> 4pi
amplitude plays a strong role. Crystal Barrel data on pbar-p -> 3pizero at rest
require f0(1370) signals of at least 32 and 33 standard deviations in 1S0 and
3P1 annihilation respectively. Furthermore, they agree within 5 MeV for mass
and width. Data on pbar-p -> eta-eta-pizero agree and require at least a 19
standard deviation contribution. This alone is sufficient to demonstrate the
existence of f0(1370). BES II data for J/Psi -> phi-pi-pi contain a visible
f0(1370) signal > 8 standard devations. In all cases, a resonant phase
variation is required. The possibility of a second pole in the sigma amplitude
due to the opening of the 4pi channel is excluded. Cern-Munich data for pi-pi
elastic scattering are fitted well with the inclusion of some mixing between
sigma, f0(1370) and f0(1500). The pi-pi widths for f2(1565), rho3(1690),
rho3(1990) and f4(2040) are determined.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 07:43:07 GMT"
},
{
"version": "v2",
"created": "Thu, 25 Oct 2007 15:57:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bugg",
"D. V.",
"",
"Queen Mary, University of London, UK"
]
] |
0706.1342 | Juhn-Jong Lin | J. J. Lin, T. C. Lee and S. W. Wang | Low-temperature electron dephasing time in AuPd revisited | to appear in Physica E, Proceedings for the International Seminar and
Workshop "Quantum Coherence, Noise, and Decoherence in Nanostructures", 15-26
May 2006, Dresden | Physica E 40, 25 (2007). | 10.1016/j.physe.2007.05.012 | null | cond-mat.mes-hall cond-mat.dis-nn | null | Ever since the first discoveries of the quantum-interference transport in
mesoscopic systems, the electron dephasing times, $\tau_\phi$, in the
concentrated AuPd alloys have been extensively measured. The samples were made
from different sources with different compositions, prepared by different
deposition methods, and various geometries (1D narrow wires, 2D thin films, and
3D thickfilms) were studied. Surprisingly, the low-temperature behavior of
$\tau_\phi$ inferred by different groups over two decades reveals a systematic
correlation with the level of disorder of the sample. At low temperatures,
where $\tau_\phi$ is (nearly) independent of temperature, a scaling
$\tau_\phi^{\rm max} \propto D^{-\alpha}$ is found, where $tau_\phi^{\rm max}$
is the maximum value of $\tau_\phi$ measured in the experiment, $D$ is the
electron diffusion constant, and the exponent $\alpha$ is close to or slightly
larger than 1. We address this nontrivial scaling behavior and suggest that the
most possible origin for this unusual dephasing is due to dynamical structure
defects, while other theoretical explanations may not be totally ruled out.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 09:16:21 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"Lin",
"J. J.",
""
],
[
"Lee",
"T. C.",
""
],
[
"Wang",
"S. W.",
""
]
] |
0706.1343 | Alexander Dzyubenko | A. B. Dzyubenko and A. R. Todd | Interacting like charges in Landau levels: Planar geometry, symmetries,
and effective quasiparticles | 9 pages, 1 figure | null | null | null | cond-mat.mes-hall | null | We consider a system of two interacting particles with like but unequal
charges in a magnetic field in the planar geometry. We construct a complete
basis of states compatible with both the axial symmetry and magnetic
translations. The basis is obtained using a canonical transformation that
generates effective quasiparticles with modified interactions. We establish a
connection of this transformation with the SU(2) algebra and make use of the
SU(2) Baker-Campbell-Hausdorff formulas for evaluating the interaction matrix
elements. We calculate analytically the eigenenergies of the problem (Haldane
pseudopotentials) in the first few Landau levels for a relatively wide class of
interaction potentials.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 09:25:33 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Dzyubenko",
"A. B.",
""
],
[
"Todd",
"A. R.",
""
]
] |
0706.1344 | Mikhail V. Ioffe | M. V. Ioffe, J. Mateos Guilarte, P. A. Valinevich | A Class of Partially Solvable Two-Dimensional Quantum Models with
Periodic Potentials | 22 pages; some typos corrected; new reference added | Nucl.Phys.B790:414-431,2008 | 10.1016/j.nuclphysb.2007.07.010 | null | hep-th cond-mat.mes-hall math-ph math.MP quant-ph | null | The supersymmetrical approach is used to analyse a class of two-dimensional
quantum systems with periodic potentials. In particular, the method of
SUSY-separation of variables allowed us to find a part of the energy spectra
and the corresponding wave functions (partial solvability) for several models.
These models are not amenable to conventional separation of variables, and they
can be considered as two-dimensional generalizations of Lame, associated Lame,
and trigonometric Razavy potentials. All these models have the symmetry
operators of fourth order in momenta, and one of them (the Lame potential)
obeys the property of self-isospectrality.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 09:33:11 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 05:58:05 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ioffe",
"M. V.",
""
],
[
"Guilarte",
"J. Mateos",
""
],
[
"Valinevich",
"P. A.",
""
]
] |
0706.1345 | Klaas Wiersema | K. Wiersema, A.J. van der Horst, D.A. Kann, E. Rol, R.L.C. Starling,
P.A. Curran, J. Gorosabel, A.J. Levan, J.P.U. Fynbo, A. de Ugarte Postigo,
R.A.M.J. Wijers, A.J. Castro-Tirado, S.S. Guziy, A. Hornstrup, J. Hjorth, M.
Jelinek, B.L. Jensen, M. Kidger, F. Martin-Luis, N.R. Tanvir, P. Tristram,
P.M. Vreeswijk | Spectroscopy and multiband photometry of the afterglow of intermediate
duration gamma-ray burst 040924 and its host galaxy | A&A submitted. 10 pages, 4 figures | Astron.Astrophys. 481 (2008) 319-326 | 10.1051/0004-6361:20078050 | null | astro-ph | null | We present optical photometry and spectroscopy of the afterglow and host
galaxy of gamma-ray burst 040924. This GRB had a rather short duration of T90
~2.4s, and a well sampled optical afterglow light curve. We aim to use this
dataset to find further evidence that this burst is consistent with a massive
star core-collapse progenitor. We combine the afterglow data reported here with
data taken from the literature and compare the host properties with survey
data. We find that the global behaviour of the optical afterglow is well fit by
a broken power-law, with a break at ~0.03 days. We determine the redshift z =
0.858 +/- 0.001 from the detected emission lines in our spectrum. Using the
spectrum and photometry we derive global properties of the host, showing it to
have similar properties to long GRB hosts. We detect the [Ne III] emission line
in the spectrum, and compare the fluxes of this line of a sample of 15 long GRB
host galaxies with survey data, showing the long GRB hosts to be comparable to
local metal-poor emission line galaxies in their [Ne III] emission. We fit the
supernova bump accompanying this burst, and find that it is similar to other
long GRB supernova bumps, but fainter. All properties of GRB 040924 are
consistent with an origin in the core-collapse of a massive star: the
supernova, the spectrum and SED of the host and the afterglow.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 11:18:21 GMT"
}
] | 2008-04-13T00:00:00 | [
[
"Wiersema",
"K.",
""
],
[
"van der Horst",
"A. J.",
""
],
[
"Kann",
"D. A.",
""
],
[
"Rol",
"E.",
""
],
[
"Starling",
"R. L. C.",
""
],
[
"Curran",
"P. A.",
""
],
[
"Gorosabel",
"J.",
""
],
[
"Levan",
"A. J.",
""
],
[
"Fynbo",
"J. P. U.",
""
],
[
"Postigo",
"A. de Ugarte",
""
],
[
"Wijers",
"R. A. M. J.",
""
],
[
"Castro-Tirado",
"A. J.",
""
],
[
"Guziy",
"S. S.",
""
],
[
"Hornstrup",
"A.",
""
],
[
"Hjorth",
"J.",
""
],
[
"Jelinek",
"M.",
""
],
[
"Jensen",
"B. L.",
""
],
[
"Kidger",
"M.",
""
],
[
"Martin-Luis",
"F.",
""
],
[
"Tanvir",
"N. R.",
""
],
[
"Tristram",
"P.",
""
],
[
"Vreeswijk",
"P. M.",
""
]
] |
0706.1346 | Jos\'e A. Caballero | Jos\'e Antonio Caballero | Southern wide very low-mass stars and brown dwarfs in resolved binary
and multiple systems | ApJ, in press | null | 10.1086/520873 | null | astro-ph | null | The results of the Koenigstuhl survey in the Southern Hemisphere are
presented. I have searched for common-proper motion companions to 173 field
very low-mass stars and brown dwarfs with spectral types > M5.0V and magnitudes
J <= 14.5 mag. I have measured for the first time the common-proper motion of
two new wide systems containing very low-mass components, Koenigstuhl 2 AB and
3 A-BC. Together with Koenigstuhl 1 AB and 2M0126-50AB, they are among the
widest systems in their respective classes (r = 450-11900 AU). Koenigstuhl 3
A-BC contains a well-known F8V star and a M8.0+L3.0V tight binary. I have
determined the minimum frequency of field wide multiples (r > 100 AU) with
late-type components at 5.0+/-1.8 % and the frequency of field wide late-type
binaries with mass ratios q > 0.5 at 1.2+/-0.9 %. These values represent a key
diagnostic of evolution history and low-mass star and brown-dwarf formation
scenarios. Additionally, the proper motions of 76 field very low-mass dwarfs
are measured here for the first time.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 10:42:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Caballero",
"José Antonio",
""
]
] |
0706.1347 | Lev Vaidman | Lev Vaidman | The Two-State Vector Formalism | 6 pages, entry for a forthcoming "Compendium of Quantum Physics" | null | null | null | quant-ph | null | The two-state vector formalism (TSVF), the time-symmetric description of the
standard quantum mechanics originated by Aharonov, Bergmann and Lebowitz is
reviewed. The TSVF describes a quantum system at a particular time by two
quantum states: the usual one, evolving forward in time, defined by the results
of a complete measurement at the earlier time, and by the quantum state
evolving backward in time, defined by the results of a complete measurement at
a later time.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 10:43:30 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Vaidman",
"Lev",
""
]
] |
0706.1348 | Lev Vaidman | Lev Vaidman | Weak Value and Weak Measurements | 4 pages, entry for a forthcoming "Compendium of Quantum Physics" | null | null | null | quant-ph | null | The weak value of a variable O is a description of an effective interaction
with that variable in the limit of weak coupling. It is particularly important
for a pre- and post-selected quantum system.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 10:53:50 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Vaidman",
"Lev",
""
]
] |
0706.1349 | Chen Wu | Chen Wu, Wei-Liang Qian and Ru-Keng Su | Improved quark mass density- dependent model with quark-sigma meson and
quark-omega meson couplings | 15 pages, 6 figures | Phys.Rev.C77:015203,2008 | 10.1103/PhysRevC.77.015203 | null | nucl-th | null | An improved quark mass density- dependent model with the non-linear scalar
sigma field and the $\omega$-meson field is presented. We show that the present
model can describe saturation properties, the equation of state, the
compressibility and the effective nuclear mass of nuclear matter under mean
field approximation successfully. The comparison of the present model and the
quark-meson coupling model is addressed.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 10:57:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wu",
"Chen",
""
],
[
"Qian",
"Wei-Liang",
""
],
[
"Su",
"Ru-Keng",
""
]
] |
0706.1350 | Jeremy Bailin | Jeremy Bailin (1,2), Chris Power (2,3), Peder Norberg (4,5), Dennis
Zaritsky (6), Brad K. Gibson (7) ((1) McMaster, (2) Swinburne, (3) Leicester,
(4) ROE, (5) ETHZ, (6) Steward Observatory, (7) UCLan) | The Anisotropic Distribution of Satellite Galaxies | 27 pages. Accepted for publication in MNRAS. Accepted version
includes substantial changes in response to referee comments | null | 10.1111/j.1365-2966.2008.13828.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify satellites of isolated galaxies in SDSS and examine their angular
distribution. Using mock catalogues generated from cosmological N-body
simulations, we demonstrate that the selection criteria used to select isolated
galaxies and their satellites must be very strict in order to correctly
identify systems in which the primary galaxy dominates its environment. The
criteria used in many previous studies instead select predominantly group
members. We refine a set of selection criteria for which the group
contamination is estimated to be less than 7% and present a catalogue of the
resulting sample. The angular distribution of satellites about their host is
biased towards the major axes for spheroidal galaxies and probably also for red
disc galaxies, but is isotropic for blue disc galaxies, i.e. it is the colour
of the host that determines the distribution of its satellites rather than its
morphology. The similar anisotropy measured in this study as in studies that
were dominated by groups implies that group-specific processes are not
responsible for the angular distribution. Satellites that are most likely to
have been recently accreted show a tendancy to lie along the same axis as the
surrounding large scale structure. The orientations of isolated early and
intermediate-type galaxies also align with the surrounding large scale
structures. We discuss the origin of the anisotropic satellite distribution and
consider the implications of our results, critically assessing the respective
roles played by the orientation of the visible galaxy within its dark matter
halo; anisotropic accretion of satellites from the larger scale environment;
and the biased nature of satellites as tracers of the underlying dark matter
subhalo population. (Abridged)
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 11:34:37 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Aug 2008 19:22:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bailin",
"Jeremy",
""
],
[
"Power",
"Chris",
""
],
[
"Norberg",
"Peder",
""
],
[
"Zaritsky",
"Dennis",
""
],
[
"Gibson",
"Brad K.",
""
]
] |
0706.1351 | Misha Katsnelson | M. I. Katsnelson | Scattering of charge carriers by point defects in bilayer graphene | final version | Phys. Rev. B76, 073411 (2007) | 10.1103/PhysRevB.76.073411 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Theory of scattering of massive chiral fermions in bilayer graphene by radial
symmetric potential is developed. It is shown that in the case when the
electron wavelength is much larger than the radius of the potential the
scattering cross-section is proportional to the electron wavelength. This leads
to the mobility independent on the electron concentration. In contrast with the
case of single-layer, neutral and charged defects are, in general, equally
relevant for the resistivity of the bilayer graphene.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 11:50:41 GMT"
},
{
"version": "v2",
"created": "Sun, 2 Sep 2007 16:47:18 GMT"
}
] | 2007-09-02T00:00:00 | [
[
"Katsnelson",
"M. I.",
""
]
] |
0706.1352 | Mario Liu | Yimin Jiang and Mario Liu | Hydrodynamic Theory of Granular Solids: Permanent, Transient and
Granular Elasticity | null | null | null | null | cond-mat.soft | null | Although fully elastic when static, granular media become transiently elastic
when being slowly sheared -- during which both the elastic energy and stress
relax. Starting from this observation, we cogently derive the framework for
granular hydrodynamics, a set of differential equations consistent with general
principles of physics, especially reversible and irreversible thermodynamics.
In addition, an expression for the granular elastic energy is reviewed and
further discussed.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 17:37:06 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Jiang",
"Yimin",
""
],
[
"Liu",
"Mario",
""
]
] |
0706.1353 | Taku Nakajima | Taku Nakajima, Masahiro Kaiden, Jun Korogi, Kimihiro Kimura, Yoshinori
Yonekura, Hideo Ogawa, Shingo Nishiura, Kazuhito Dobashi, Toshihiro Handa,
Kotaro Kohno, Jun-Ichi Morino, Shin'ichiro Asayama, and Takashi Noguchi | New 60-cm Radio Survey Telescope with the Sideband-Separating SIS
Receiver for the 200 GHz Band | 15 pages, 15 figures, Accepted for publication in PASJ, version with
high resolution figures is available via
http://www.nro.nao.ac.jp/~nakajima/vst1_2sb.pdf | null | 10.1093/pasj/59.5.1005 | null | astro-ph | null | We have upgraded the 60-cm radio survey telescope located in Nobeyama, Japan.
We developed a new waveguide-type sideband-separating SIS mixer for the
telescope, which enables the simultaneous detection of distinct molecular
emission lines both in the upper and lower sidebands. Over the RF frequency
range of 205-240 GHz, the single-sideband receiver noise temperatures of the
new mixer are 40-100 K for the 4.0-8.0 GHz IF frequency band. The image
rejection ratios are greater than 10 dB over the same range. For the dual IF
signals obtained by the receiver, we have developed two sets of acousto-optical
spectrometers and a telescope control system. Using the new telescope system,
we successfully detected the 12CO (J=2-1) and 13CO (J=2-1) emission lines
simultaneously toward Orion KL in 2005 March. Using the waveguide-type
sideband-separating SIS mixer for the 200 GHz band, we have initiated the first
simultaneous 12CO (J=2-1) and 13CO (J=2-1) survey of the galactic plane as well
as large-scale mapping observations of nearby molecular clouds.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 11:55:59 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Nakajima",
"Taku",
""
],
[
"Kaiden",
"Masahiro",
""
],
[
"Korogi",
"Jun",
""
],
[
"Kimura",
"Kimihiro",
""
],
[
"Yonekura",
"Yoshinori",
""
],
[
"Ogawa",
"Hideo",
""
],
[
"Nishiura",
"Shingo",
""
],
[
"Dobashi",
"Kazuhito",
""
],
[
"Handa",
"Toshihiro",
""
],
[
"Kohno",
"Kotaro",
""
],
[
"Morino",
"Jun-Ichi",
""
],
[
"Asayama",
"Shin'ichiro",
""
],
[
"Noguchi",
"Takashi",
""
]
] |
0706.1354 | Mario Liu | Yimin Jiang and Mario Liu | From Elasticity to Hypoplasticity: Dynamics of Granular Solids | null | null | 10.1103/PhysRevLett.99.105501 | null | cond-mat.soft | null | "Granular elasticity," useful for calculating static stress distributions in
granular media, is generalized by including the effects of slowly moving,
deformed grains. The result is a hydrodynamic theory for granular solids that
agrees well with models from soil mechanics.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 17:37:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jiang",
"Yimin",
""
],
[
"Liu",
"Mario",
""
]
] |
0706.1355 | Martin Chaplin | Martin Chaplin | Water's Hydrogen Bond Strength | 20 pages | null | null | null | cond-mat.soft physics.bio-ph | null | Water is necessary both for the evolution of life and its continuance. It
possesses particular properties that cannot be found in other materials and
that are required for life-giving processes. These properties are brought about
by the hydrogen bonded environment particularly evident in liquid water. Each
liquid water molecule is involved in about four hydrogen bonds with strengths
considerably less than covalent bonds but considerably greater than the natural
thermal energy. These hydrogen bonds are roughly tetrahedrally arranged such
that when strongly formed the local clustering expands, decreasing the density.
Such low density structuring naturally occurs at low and supercooled
temperatures and gives rise to many physical and chemical properties that
evidence the particular uniqueness of liquid water. If aqueous hydrogen bonds
were actually somewhat stronger then water would behave similar to a glass,
whereas if they were weaker then water would be a gas and only exist as a
liquid at sub-zero temperatures. The overall conclusion of this investigation
is that water's hydrogen bond strength is poised centrally within a narrow
window of its suitability for life.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 12:03:01 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Chaplin",
"Martin",
""
]
] |
0706.1356 | Luis Izquierdo | Segismundo S. Izquierdo and Luis R. Izquierdo | A discriminative method to conduct exploratory analyses in networks | This paper has been withdrawn | null | null | null | physics.data-an | null | This paper, which commented on Newman and Leicht's "Mixture models and
exploratory analysis in networks" (2007, PNAS 104, 9564-9569), has been
withdrawn. The reason for this removal is that we misinterpreted the conceptual
framework that the authors of the original paper use. Specifically, it is
assumed in our paper that the variable theta_ri denotes the *a priori*
probability that there exists an edge from group r to vertex i. The correct
interpretation is that theta_ri denotes the probability that a given edge from
group r connects to vertex i.
We are very grateful to Mark Newman and Elizabeth Leicht not only for
pointing out our misinterpretation, but also for doing it so politely and
gracefully.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 10:43:55 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Jun 2007 02:53:33 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Izquierdo",
"Segismundo S.",
""
],
[
"Izquierdo",
"Luis R.",
""
]
] |
0706.1357 | Jeremy Bailin | Jeremy Bailin (1), Josh D. Simon (2), Alberto D. Bolatto (3), Brad K.
Gibson (4), Chris Power (1) ((1) Swinburne, (2) Caltech, (3) Berkeley, (4)
UCLan) | Self-consistent massive disks in triaxial dark matter halos | ApJ, in press | Astrophys.J.667:191-201,2007 | 10.1086/520843 | null | astro-ph | null | Galactic disks in triaxial dark matter halos become deformed by the
elliptical potential in the plane of the disk in such a way as to counteract
the halo ellipticity. We develop a technique to calculate the equilibrium
configuration of such a disk in the combined disk-halo potential, which is
based on the method of Jog (2000) but accounts for the radial variation in both
the halo potential and the disk ellipticity. This crucial ingredient results in
qualitatively different behavior of the disk: the disk circularizes the
potential at small radii, even for a reasonably low disk mass. This effect has
important implications for proposals to reconcile cuspy halo density profiles
with low surface brightness galaxy rotation curves using halo triaxiality. The
disk ellipticities in our models are consistent with observational estimates
based on two-dimensional velocity fields and isophotal axis ratios.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 13:01:46 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bailin",
"Jeremy",
""
],
[
"Simon",
"Josh D.",
""
],
[
"Bolatto",
"Alberto D.",
""
],
[
"Gibson",
"Brad K.",
""
],
[
"Power",
"Chris",
""
]
] |
0706.1358 | Kai Pan | Pan Kai, Zhang Ren-You, Ma Wen-Gan, Sun Hao, Han Liang, and Jiang Yi | The effects of the little Higgs models on $t\bar{t} h^0$ production via
$\gamma \gamma$ collision at linear colliders | 22 pages, 25 figures, version to appear in Phys. Rev. D | Phys.Rev.D76:015012,2007 | 10.1103/PhysRevD.76.015012 | null | hep-ph | null | In the frameworks of the littlest Higgs($LH$) model and its extension with
T-parity($LHT$), we studied the associated $t\bar th^0$ production process $e^+
e^- \to \gamma\gamma \to t \bar t h^0$ at the future $e^+e^-$ linear colliders
up to QCD next-to-leading order. We present the regions of $\sqrt{s}-f$
parameter space in which the $LH$ and $LHT$ effects can and cannot be
discovered with the criteria assumed in this paper. The production rates of
process $\gamma\gamma \to t \bar t h^0$ in different photon polarization
collision modes are also discussed. We conclude that one could observe the
effects contributed by the $LH$ or $LHT$ model on the cross section for the
process $e^+ e^- \to \gamma\gamma \to t \bar t h^0$ in a reasonable parameter
space, or might put more stringent constraints on the $LH$/$LHT$ parameters in
the future experiments at linear colliders.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 07:08:20 GMT"
}
] | 2009-11-23T00:00:00 | [
[
"Kai",
"Pan",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Hao",
"Sun",
""
],
[
"Liang",
"Han",
""
],
[
"Yi",
"Jiang",
""
]
] |
0706.1359 | Sergey P. Emelyanov | Sergey Emelyanov | Evidence for high-temperature topological order in an asymmetric quantum
Hall system | This paper has been withdrawn by the author because further
experiments showed the incorrectness of proposed interpretation | null | null | null | cond-mat.mes-hall cond-mat.stat-mech | null | Further experiments showed the incorrectness of proposed interpretation.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 13:51:59 GMT"
},
{
"version": "v2",
"created": "Tue, 13 Apr 2010 13:10:29 GMT"
},
{
"version": "v3",
"created": "Mon, 11 Feb 2013 13:03:16 GMT"
}
] | 2013-02-12T00:00:00 | [
[
"Emelyanov",
"Sergey",
""
]
] |
0706.1360 | Masoud Alimohammadi | Masoud Alimohammadi | Asymptotic behavior of w in general quintom model | 8 pages, one example is added, accepted for publication in Gen. Rel.
Grav | Gen.Rel.Grav.40:107-115,2008 | 10.1007/s10714-007-0514-3 | null | gr-qc astro-ph hep-th | null | For the quintom models with arbitrary potential $V=V(\phi,\sigma)$, the
asymptotic value of equation of state parameter w is obtained by a new method.
In this method, w of stable attractors are calculated by using the ratio (d ln
V)/(d ln a) in asymptotic region. All the known results, have been obtained by
other methods, are reproduced by this method as specific examples.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 14:40:33 GMT"
},
{
"version": "v2",
"created": "Sat, 25 Aug 2007 21:56:27 GMT"
},
{
"version": "v3",
"created": "Thu, 11 Oct 2007 09:02:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Alimohammadi",
"Masoud",
""
]
] |
0706.1361 | Silvia Vaula' | Silvia Vaula | Domain Wall/Cosmology correspondence in (AdS/dS)_6 x S^4 geometries | 11 pages, LaTeX | Phys.Lett.B653:95-100,2007 | 10.1016/j.physletb.2007.07.048 | null | hep-th | null | We investigate the ten dimensional origin of six dimensional F_4 variant
supergravity with supersymmetric de Sitter background. We address first the
issue of spontaneous compactification, showing that it consists of a warped
compactification on a four sphere of a variant massive type IIA supergravity.
Moreover we illustrate how the known D4-D8 brane solution, whose near horizon
geometry yields AdS_6 x S^4, is accordingly modified to a system including
Euclidean branes. Finally, we discuss the relation between this latter solution
and the D4-D8 brane system, showing how it represents a generalisation of the
DW/Cosmology correspondence.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 15:20:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Vaula",
"Silvia",
""
]
] |
0706.1362 | Baruch Horovitz | Victor Kagalovsky and Baruch Horovitz | Particle renormalizations in presence of dissipative environments | 7 pages, 6 figures. Revised version has extended the numerical data
with some modified conclusions | null | 10.1103/PhysRevB.78.125322 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Aharonov-Bohm oscillations of a charged particle on a ring of
radius R coupled to a dirty metal environment. With Monte-Carlo methods we
evaluate the curvature of these oscillations which has the form 1/M*R^2, where
M* is an effective mass. We find that at low temperatures T the curvature
approaches at large R>l an R independent M*>M, where l is the mean free path in
the metal. This behavior is also consistent with perturbation theory in the
particle - metal coupling parameter. At finite temperature T we identify
dephasing lengths that scale as T^{-1} at R>l and as T^{-1/4} at R<<l.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 15:58:36 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 17:12:23 GMT"
},
{
"version": "v3",
"created": "Fri, 4 Jul 2008 15:23:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kagalovsky",
"Victor",
""
],
[
"Horovitz",
"Baruch",
""
]
] |
0706.1363 | Pascal Lambrechts | Pascal Lambrechts and Don Stanley | The rational homotopy type of a blow-up in the stable case | null | Geom. Topol. 12 (2008) 1921-1993 | 10.2140/gt.2008.12.1921 | null | math.AT math.SG | null | Suppose that f:V->W is an embedding of closed oriented manifolds whose normal
bundle has the structure of a complex vector bundle. It is well known in both
complex and symplectic geometry that one can then construct a manifold W' which
is the blow-up of W along V. Assume that dim(W)>2.dim(V)+2 and that H^1(f) is
injective. We construct an algebraic model of the rational homotopy type of the
blow-up W' from an algebraic model of the embedding and the Chern classes of
the normal bundle. This implies that if the space W is simply connected then
the rational homotopy type of W' depends only on the rational homotopy class of
f and on the Chern classes of the normal bundle.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 16:24:23 GMT"
}
] | 2014-11-11T00:00:00 | [
[
"Lambrechts",
"Pascal",
""
],
[
"Stanley",
"Don",
""
]
] |
0706.1364 | Samuel Moukouri | S. Moukouri (U. of Michigan) | Antiferromagnetism and Superconductivity in a model of Quasi 1D Organic
Conductors | 4 pages, 3 figures | null | null | null | cond-mat.str-el cond-mat.supr-con | null | I apply a two-step renormalization group method to the study of the
competition between antiferromagnetism (AFM) and superconductivity in an
anisotropic 2D Hubbard model. I show that this simple model captures the
essentials of the ground-state phases of the quasi 1D organic conductors. As
found experimentally, the ground-state phase diagram is mostly AFM. The AFM is
localized in the strong-coupling limit where the electrons are confined in the
chains. It is an SDW in the weak-coupling limit where interchain hopping is
present. There is a tiny region in the weak-coupling regime where transverse
two-particle hopping is dominant over magnetism.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 16:45:08 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Moukouri",
"S.",
"",
"U. of Michigan"
]
] |
0706.1365 | Akhlesh Lakhtakia | Akhlesh Lakhtakia | Surface-plasmon wave at the planar interface of a metal film and a
structurally chiral medium | null | Opt. Commun., Vol. 279, pp. 291-297 (2007) | 10.1016/j.optcom.2007.07.026 | null | physics.optics physics.class-ph | null | The solution of a boundary-value problem formulated for a modified
Kretschmann configuration shows that a surface-plasmon wave can be excited at
the planar interface of a sufficiently thin metal film and a nondissipative
structurally chiral medium, provided the exciting plane wave is p-polarized. An
estimate of the wavenumber of the surface-plasmon wave also emerges thereby.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 17:03:28 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Lakhtakia",
"Akhlesh",
""
]
] |
0706.1366 | Ulysse Serres | Ulysse Serres | On Zermelo'-like problems: a Gauss-Bonnet inequality and a E. Hopf
theorem | 27 pages, 1 figure | null | null | null | math.OC math.DG | null | The goal of this paper is to describe Zermelo's navigation problem on
Riemannian manifolds as a time-optimal control problem and give an efficient
method in order to evaluate its control curvature. We will show that up to
change the Riemannian metric on the manifold the control curvature of Zermelo's
problem has a simple to handle expression which naturally leads to a
generalization of the classical Gauss-Bonnet formula in an inequality. This
Gauss-Bonnet inequality enables to generalize for Zermelo's problems the E.
Hopf theorem on flatness of Riemannian tori without conjugate points.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 18:00:11 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Serres",
"Ulysse",
""
]
] |
0706.1367 | Jesus I?arrea | Jesus Inarrea | Anharmonic behavior in Microwave-driven resistivity oscillations in Hall
bars | 3 pages, 2 figures. Accepted in Applied Physics Letters | null | 10.1063/1.2751585 | null | cond-mat.mes-hall | null | We analyzed the magnetoresistivity of a two-dimensional electron system
excited by microwave radiation in a regime of high intensities and low
frequencies. In such a regime, recent experiments show that different features
appear in the magnetoresistivity response which suggest an anharmonic behavior.
These features consist mainly in distorted oscillations and new resonance peaks
at the subharmonics of the cyclotron frequency. We follow the model of
microwave-driven electron orbits motion which become anharmonic when the ratio
of microwave intensity to microwave frequency is large enough.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 17:56:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Inarrea",
"Jesus",
""
]
] |
0706.1368 | Christian Reinboth | Ulrich H.P. Fischer, Thomas Windel | Optical Characterization of Single Mode Components by new
Medianfield-method | Published at LANE 2004 in Erlangen, Germany | null | null | null | physics.optics | null | In this paper a new method for spotsize-measurement for singlemode optical
components is presented. Based from the classical farfield-method where the
measurements are made circular, the mounting of the used rotary stages and the
long measurement time are great disadvantages. In this paper a new planar
method is described which overcomes these problems. Based on the measurement of
a singlemode fiber in accordance with ITU Recommendation G.652 the efficiency
is demonstrated and discussed.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 18:08:29 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Fischer",
"Ulrich H. P.",
""
],
[
"Windel",
"Thomas",
""
]
] |
0706.1369 | Christian Reinboth | Ulrich H.P. Fischer, Michael Schmidt, Tino Volmer, Bjoern Weigl,
Jens-Uwe Just | Visible Wavelength Division Multiplex System for use as a Instructional
Lab System for Higher Education | Published at the Conference on Education and Training in Optics and
Physics 2005 | null | null | null | physics.optics | null | The demand for high-speed digital communication such as data, video, and the
broadband Internet increases, the required throughput of the modules in
communications systems will also increase. In this paper we present an
instruction system, which works on the basis of a wavelength division multiplex
(WDM) system in the visible spectrum. It is specialised for the academic
training at universities to demonstrate the principles of the WDM techniques.
It works platform independent in combination with active modules in the
training description, short inline videos and interactive diagrams. The system
consists of LEDs in different wavelengths using analog and digital signals.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 18:25:06 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Fischer",
"Ulrich H. P.",
""
],
[
"Schmidt",
"Michael",
""
],
[
"Volmer",
"Tino",
""
],
[
"Weigl",
"Bjoern",
""
],
[
"Just",
"Jens-Uwe",
""
]
] |
0706.1370 | Petr Nicolaevich Bibikov | P. N. Bibikov | Magnon mode truncation in a rung-dimerized asymmetric spin ladder | 11 pages | Phys. Rev. B 76, 174431 (2007) | 10.1103/PhysRevB.76.174431 | null | cond-mat.str-el | null | An exactly solvable effective model is suggested for an asymmetric spin
ladder with dimerized rungs. Magnon mode truncation originated from magnon
decay (recently observed in the 1D compound ${\rm IPA-CuCl}_3$) is naturally
described within this model. Using Bethe Ansatze we described a one-magnon
sector and obtained relations between interaction constants of the model and
experimentally observable quantities such as the gap and truncation energies,
spin velocity and the truncation wave vector. It is also shown that structure
factor turns to zero at the truncation point.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 18:50:47 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Dec 2007 19:28:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bibikov",
"P. N.",
""
]
] |
0706.1371 | Pavel Levashov | M. E. Povarnitsyn, T. E. Itina, M. Sentis, K. V. Khishchenko and P. R.
Levashov | Material decomposition mechanisms in femtosecond laser interactions with
metals | Submitted to Physical Review B, 12 pages, 3 figures | null | 10.1103/PhysRevB.75.235414 | null | physics.comp-ph | null | A numerical hydrodynamic study of femtosecond laser ablation is presented. A
detailed analysis of material decomposition is performed using a
thermodynamically complete equation of state with separate stable and
metastable phase states and phase boundaries. The lifetime of the metastable
liquid state is estimated based on the classical theory of homogeneous
nucleation. In addition, mechanical fragmentation of the target material is
controlled based on available criteria. As a result, several ablation
mechanisms are observed. A major fraction of the ablated material, however, is
found to originate from the metastable liquid region, which is decomposed
either thermally in the vicinity of the critical point into a liquid-gas
mixture, or mechanically at high strain rate and negative pressure into liquid
droplets and chunks. The calculation results explain available experimental
findings.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 19:00:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Povarnitsyn",
"M. E.",
""
],
[
"Itina",
"T. E.",
""
],
[
"Sentis",
"M.",
""
],
[
"Khishchenko",
"K. V.",
""
],
[
"Levashov",
"P. R.",
""
]
] |
0706.1372 | J\"orn Wilms | Joern Wilms (1), Katja Pottschmidt (2), Guy G. Pooley (3), Sera
Markoff (4), Michael A. Nowak (5), Ingo Kreykenbohm (6), Richard E.
Rothschild (2) ((1) Remeis Observatory, (2) UCSD-CASS, (3) MRAO, (4) UvA, (5)
MIT Kavli Institute, (6) ISDC and IAA Tuebingen) | Correlated radio--X-ray variability of Galactic Black Holes: A
radio--X-ray flare in Cygnus X-1 | 4 pages, 4 figures | Astrophys. J. 663, L97-L100, 2007 | 10.1086/520508 | null | astro-ph | null | We report on the first detection of a quasi-simultaneous radio-X-ray flare of
Cygnus X-1. The detection was made on 2005 April 16 with pointed observations
by the Rossi X-ray Timing Explorer and the Ryle telescope, during a phase where
the black hole candidate was close to a transition from the its soft into its
hard state. The radio flare lagged the X-rays by approximately 7 minutes,
peaking at 3:20 hours barycentric time (TDB 2453476.63864). We discuss this lag
in the context of models explaining such flaring events as the ejection of
electron bubbles emitting synchrotron radiation.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 20:34:54 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wilms",
"Joern",
""
],
[
"Pottschmidt",
"Katja",
""
],
[
"Pooley",
"Guy G.",
""
],
[
"Markoff",
"Sera",
""
],
[
"Nowak",
"Michael A.",
""
],
[
"Kreykenbohm",
"Ingo",
""
],
[
"Rothschild",
"Richard E.",
""
]
] |
0706.1373 | Folkert Muller-Hoissen | Aristophanes Dimakis and Folkert Muller-Hoissen | Dispersionless limit of the noncommutative potential KP hierarchy and
solutions of the pseudodual chiral model in 2+1 dimensions | 37 pages, 10 figures, 2nd version: some extensions (Fig 3, Appendix
A, additional references), 3rd version: some minor changes, additional
references | J. Phys. A: Math. Theor. 41 (2008) 265205 | 10.1088/1751-8113/41/26/265205 | null | nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The usual dispersionless limit of the KP hierarchy does not work in the case
where the dependent variable has values in a noncommutative (e.g. matrix)
algebra. Passing over to the potential KP hierarchy, there is a corresponding
scaling limit in the noncommutative case, which turns out to be the hierarchy
of a `pseudodual chiral model' in 2+1 dimensions (`pseudodual' to a hierarchy
extending Ward's (modified) integrable chiral model). Applying the scaling
procedure to a method generating exact solutions of a matrix (potential) KP
hierarchy from solutions of a matrix linear heat hierarchy, leads to a
corresponding method that generates exact solutions of the matrix
dispersionless potential KP hierarchy, i.e. the pseudodual chiral model
hierarchy. We use this result to construct classes of exact solutions of the
su(m) pseudodual chiral model in 2+1 dimensions, including various multiple
lump configurations.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 21:33:09 GMT"
},
{
"version": "v2",
"created": "Tue, 17 Jul 2007 20:12:39 GMT"
},
{
"version": "v3",
"created": "Thu, 12 Jun 2008 09:35:02 GMT"
}
] | 2008-06-12T00:00:00 | [
[
"Dimakis",
"Aristophanes",
""
],
[
"Muller-Hoissen",
"Folkert",
""
]
] |
0706.1374 | Jeffrey Buboltz | Jeffrey T. Buboltz, Charles Bwalya, Krystle Williams, Matthew Schutzer | High Resolution Mapping of Phase Behavior in a Ternary Lipid Mixture: Do
Lipid-Raft Phase Boundaries Depend on Sample-Prep Procedure? | 4 pages, 4 figures; submitted to Langmuir as a Letter | null | null | null | physics.bio-ph | null | For some time now, we have been using a FRET-based strategy to make
high-resolution studies of phase behavior in ternary lipid-raft membrane
mixtures. Our FRET experiments can be carried out on ordinary, polydisperse
multilamellar vesicle suspensions, so we are able to prepare our samples
according to a procedure that was designed specifically to guard against
artifactual phase separation. In some respects (i.e., the number and nature of
two-phase regions observed), our phase diagrams are consistent with previously
published reports. However, in other respects (i.e., overall size of
miscibility gaps, phase boundary locations and their dependence on temperature)
there are clear differences. Here we present FRET data taken in
DOPC/DPPC/Cholesterol mixtures at 25.0, 35.0 and 45.0oC. Comparisons between
our results and previously reported phase boundaries suggest that lipid-raft
mixtures may be particularly susceptible to demixing effects during sample
preparation.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 16:30:19 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Aug 2007 13:13:02 GMT"
}
] | 2007-08-14T00:00:00 | [
[
"Buboltz",
"Jeffrey T.",
""
],
[
"Bwalya",
"Charles",
""
],
[
"Williams",
"Krystle",
""
],
[
"Schutzer",
"Matthew",
""
]
] |
0706.1375 | Peter Dunsby | M. Abdelwahab, S Carloni, P K. S. Dunsby | Cosmological dynamics of exponential gravity | 17 pages LaTeX, 3 figures | Class.Quant.Grav.25:135002,2008 | 10.1088/0264-9381/25/13/135002 | null | gr-qc astro-ph hep-th | null | We present a detailed investigation of the cosmological dynamics based on
$\exp (-R/{\Lambda})$ gravity. We apply the dynamical system approach to both
the vacuum and matter cases and obtain exact solutions and their stability in
the finite and asymptotic regimes. The results show that cosmic histories exist
which admit a double de-Sitter phase which could be useful for describing the
early and the late-time accelerating universe.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 21:40:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Abdelwahab",
"M.",
""
],
[
"Carloni",
"S",
""
],
[
"Dunsby",
"P K. S.",
""
]
] |
0706.1376 | Wan Kyu Park | W. K. Park, H. Stalzer, J. L. Sarrao, J. D. Thompson, L. D. Pham, Z.
Fisk, J. Frederick, P. C. Canfield, L. H. Greene | Point-contact Andreev reflection spectroscopy of
heavy-fermion-metal/superconductor junctions | 2 pages, 2 figures, submitted to the SCES conference, Houston, Texas,
USA, May 13-18, 2007 | Physical B 403, 818-819 (2008) | 10.1016/j.physb.2007.10.229 | null | cond-mat.supr-con cond-mat.str-el | null | Our previous point-contact Andreev reflection studies of the heavy-fermion
superconductor CeCoIn$_5$ using Au tips have shown two clear features: reduced
Andreev signal and asymmetric background conductance [1]. To explore their
physical origins, we have extended our measurements to point-contact junctions
between single crystalline heavy-fermion metals and superconducting Nb tips.
Differential conductance spectra are taken on junctions with three
heavy-fermion metals, CeCoIn$_5$, CeRhIn$_5$, and YbAl$_3$, each with different
electron mass. In contrast with Au/CeCoIn$_5$ junctions, Andreev signal is not
reduced and no dependence on effective mass is observed. A possible explanation
based on a two-fluid picture for heavy fermions is proposed. [1] W. K. Park et
al., Phys. Rev. B 72 052509 (2005); W. K. Park et al., Proc. SPIE-Int. Soc.
Opt. Eng. 5932 59321Q (2005); W. K. Park et al., Physica C (in press)
(cond-mat/0606535).
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 21:45:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Park",
"W. K.",
""
],
[
"Stalzer",
"H.",
""
],
[
"Sarrao",
"J. L.",
""
],
[
"Thompson",
"J. D.",
""
],
[
"Pham",
"L. D.",
""
],
[
"Fisk",
"Z.",
""
],
[
"Frederick",
"J.",
""
],
[
"Canfield",
"P. C.",
""
],
[
"Greene",
"L. H.",
""
]
] |
0706.1377 | Angel De Paoli | C.G.Bollini and M.C.Rocca | Bosonic String and String Field Theory: a solution using
Ultradistributions of Exponential Type | 30 pages | Int.J.Theor.Phys.47:1409-1423,2008 | 10.1007/s10773-007-9583-z | null | hep-th | null | In this paper we show that Ultradistributions of Exponential Type (UET) are
appropriate for the description in a consistent way string and string field
theories. A new Lagrangian for the closed string is obtained and shown to be
equivalent to Nambu-Goto's Lagrangian. We also show that the string field is a
linear superposition of UET of compact support CUET). We evaluate the
propagator for the string field, and calculate the convolution of two of them.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 22:03:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bollini",
"C. G.",
""
],
[
"Rocca",
"M. C.",
""
]
] |
0706.1378 | Shin'ichi Nojiri | Shin'ichi Nojiri and Sergei D. Odintsov | Newton law corrections and instabilities in $f(R)$ gravity with the
effective cosmological constant epoch | LaTeX file, 9 pages, correction/clarification is made | Phys.Lett.B652:343-348,2007 | 10.1016/j.physletb.2007.07.039 | null | hep-th astro-ph gr-qc | null | We consider class of modified $f(R)$ gravities with the effective
cosmological constant epoch at the early and late universe. Such models pass
most of solar system tests as well they satisfy to cosmological bounds. Despite
their very attractive properties, it is shown that one realistic class of such
models may lead to significant Newton law corrections which become small at the
future universe only. The model with acceptable Newton law regime shows the
matter instability. This suggests that more complicated version of such theory
(or extended parameters space) should be investigated.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 22:04:00 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Jun 2007 11:29:06 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] |
0706.1379 | Konstantinos Drakakis | Konstantinos Drakakis, Scott Rickard | On the generalization of the Costas property in the continuum | null | null | null | null | math.CO | null | We extend the definition of the Costas property to functions in the
continuum, namely on intervals of the reals or the rationals, and argue that
such functions can be used in the same applications as discrete Costas arrays.
We construct Costas bijections in the real continuum within the class of
piecewise continuously differentiable functions, but our attempts to construct
a fractal-like Costas bijection there are successful only under slight but
necessary deviations from the usual arithmetic laws. Furthermore, we are able,
contingent on the validity of Artin's conjecture, to set up a limiting process
according to which sequences of Welch Costas arrays converge to smooth Costas
bijections over the reals. The situation over the rationals is different:
there, we propose an algorithm of great generality and flexibility for the
construction of a Costas fractal bijection. Its success, though, relies heavily
on the enumerability of the rationals, and therefore it cannot be generalized
over the reals in an obvious way.
| [
{
"version": "v1",
"created": "Sun, 10 Jun 2007 22:37:52 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Drakakis",
"Konstantinos",
""
],
[
"Rickard",
"Scott",
""
]
] |
0706.1380 | Matthew Baumgart | Matthew Baumgart | The Advantages of Four Dimensions for Composite Higgs Models | 25 pages, 4 figures | null | null | null | hep-ph | null | We examine the relationship between little Higgs and 5d composite models with
identical symmetry structures. By performing an "extreme" deconstruction, one
can reduce any warped composite model to a little Higgs theory on a handful of
sites. This allows us to use 4d intuition and the powerful constraints of
nonlinear sigma models to elucidate obscure points in the original setup. We
find that the finiteness of the Higgs potential in 5d is due to the same
collective symmetry breaking as in the little Higgs. We compare a 4d and a 5d
model with the same symmetry to the data. Reviewing the constraints on models
related to the Minimal Composite Higgs (hep-ph/0412089), we see that it has
difficulty in producing acceptable values for S, T, and m_{top} simultaneously.
By contrast, in a global analysis, the Minimal Moose with custodial symmetry is
viable in a large region of its parameter space and suffers from no numeric
tunings. We conjecture that this result is generic for 4d and 5d models with
identical symmetries. The data will less strongly constrain the little theory.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 00:05:03 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Baumgart",
"Matthew",
""
]
] |
0706.1381 | David Swinarski | Elizabeth Baldwin (Oxford), David Swinarski (Columbia) | A geometric invariant theory construction of moduli spaces of stable
maps | 75 pages LaTeX; the GIT construction of moduli spaces of stable
n-pointed curves is now given over the integers | International Mathematics Research Papers (2008) Vol. 2008 :
article ID rpn004, 104 pages | 10.1093/imrp/rpn004 | null | math.AG | null | We construct the moduli spaces of stable maps, \bar M_g,n(P^r,d), via
geometric invariant theory (GIT). This construction is only valid over Spec C,
but a special case is a GIT presentation of the moduli space of stable curves
of genus g with n marked points, \bar M_g,n; this is valid over Spec Z. Our
method follows that used in the case n=0 by Gieseker to construct \bar M_g,
though our proof that the semistable set is nonempty is entirely different.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 00:22:22 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Jun 2007 20:32:41 GMT"
},
{
"version": "v3",
"created": "Mon, 27 Aug 2007 19:56:44 GMT"
}
] | 2008-10-18T00:00:00 | [
[
"Baldwin",
"Elizabeth",
"",
"Oxford"
],
[
"Swinarski",
"David",
"",
"Columbia"
]
] |
0706.1382 | Bei Zeng | Bei Zeng, Andrew Cross, and Isaac L. Chuang | Transversality versus Universality for Additive Quantum Codes | 12 pages; reference added to 0707.4000; minor revisions v3 | null | null | null | quant-ph | null | Certain quantum codes allow logic operations to be performed on the encoded
data, such that a multitude of errors introduced by faulty gates can be
corrected. An important class of such operations are {\em transversal}, acting
bitwise between corresponding qubits in each code block, thus allowing error
propagation to be carefully limited. If any quantum operation could be
implemented using a set of such gates, the set would be {\em universal}; codes
with such a universal, transversal gate set have been widely desired for
efficient fault-tolerant quantum computation. We study the structure of
GF(4)-additive quantum codes and prove that no universal set of transversal
logic operations exists for these codes. This result strongly supports the idea
that additional primitive operations, based for example on quantum
teleportation, are necessary to achieve universal fault-tolerant computation on
additive codes.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 00:22:31 GMT"
},
{
"version": "v2",
"created": "Tue, 31 Jul 2007 15:37:32 GMT"
},
{
"version": "v3",
"created": "Tue, 11 Sep 2007 00:05:22 GMT"
}
] | 2007-09-11T00:00:00 | [
[
"Zeng",
"Bei",
""
],
[
"Cross",
"Andrew",
""
],
[
"Chuang",
"Isaac L.",
""
]
] |
0706.1383 | Rafi Mohd | Mohd Rafi | Fixed point theorem for discontinuous mappings on PN spaces | 7 pages | null | null | null | math.FA | null | We present a study on strong t-continuity and measure of discontinuity on PN
spaces. As an application, we prove a fixed point theorem for a self mapping on
PN spaces by means of measure of discontinuity.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 00:40:48 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Rafi",
"Mohd",
""
]
] |
0706.1384 | Daniel Reyes | Daniel Reyes and Mucio A. Continentino | Thermodynamic quantum critical behavior of the Kondo necklace model | Submitted to PRB | Phys. Rev. B 76, 075114 (2007) | 10.1103/PhysRevB.76.075114 | null | cond-mat.str-el | null | We obtain the phase diagram and thermodynamic behavior of the Kondo necklace
model for arbitrary dimensions $d$ using a representation for the localized and
conduction electrons in terms of local Kondo singlet and triplet operators. A
decoupling scheme on the double time Green's functions yields the dispersion
relation for the excitations of the system. We show that in $d\geq 3$ there is
an antiferromagnetically ordered state at finite temperatures terminating at a
quantum critical point (QCP). In 2-d, long range magnetic order occurs only at
T=0. The line of Neel transitions for $d>2$ varies with the distance to the
quantum critical point QCP $|g|$ as, $T_N \propto |g|^{\psi}$ where the shift
exponent $\psi=1/(d-1)$. In the paramagnetic side of the phase diagram, the
spin gap behaves as $\Delta\approx \sqrt{|g|}$ for $d \ge 3$ consistent with
the value $z=1$ found for the dynamical critical exponent. We also find in this
region a power law temperature dependence in the specific heat for
$k_BT\gg\Delta$ and along the non-Fermi liquid trajectory. For $k_BT
\ll\Delta$, in the so-called Kondo spin liquid phase, the thermodynamic
behavior is dominated by an exponential temperature dependence.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 00:52:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Reyes",
"Daniel",
""
],
[
"Continentino",
"Mucio A.",
""
]
] |
0706.1385 | Rafi Mohd | Ioan Golet and Mohd Rafi | On (g, \phi)-contraction in fuzzy metric spaces | 9 pages | null | null | null | math.FA | null | In this paper, we give a generalization of Hicks type contractions and Golet
type contractions on fuzzy metric spaces. We prove some fixed point theorems
for this new type contractions mappings on fuzzy metric spaces.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 01:43:14 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Golet",
"Ioan",
""
],
[
"Rafi",
"Mohd",
""
]
] |
0706.1386 | Alexander J. Wagner | A.J. Wagner and C.M. Pooley | Interface Width and Bulk Stability: requirements for the simulation of
Deeply Quenched Liquid-Gas Systems | 5 pages, 3 figures | null | 10.1103/PhysRevE.76.045702 | null | cond-mat.soft | null | Simulations of liquid-gas systems with extended interfaces are observed to
fail to give accurate results for two reasons: the interface can get ``stuck''
on the lattice or a density overshoot develops around the interface. In the
first case the bulk densities can take a range of values, dependent on the
initial conditions. In the second case inaccurate bulk densities are found. In
this communication we derive the minimum interface width required for the
accurate simulation of liquid gas systems with a diffuse interface. We
demonstrate this criterion for lattice Boltzmann simulations of a van der Waals
gas. When combining this criterion with predictions for the bulk stability we
can predict the parameter range that leads to stable and accurate simulation
results. This allows us to identify parameter ranges leading to high density
ratios of over 1000. This is despite the fact that lattice Boltzmann
simulations of liquid-gas systems were believed to be restricted to modest
density ratios of less than 20.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 01:50:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wagner",
"A. J.",
""
],
[
"Pooley",
"C. M.",
""
]
] |
0706.1387 | Yunkyu Bang | Yunkyu Bang | Theory of Neutron Scattering in High-T$_c$ Cuprates: Two Component
Spin-Fermion Model | Correction of legend in Fig.1, No changes of contents | null | null | null | cond-mat.str-el cond-mat.supr-con | null | Recent neutron scattering experiments have revealed that the generic form of
the magnetic excitations in the high-Tc cuprates of wide range of doping has
the so-called "hourglass" shape; it features both upward and downward
excitations at the incommensurate (IC) momenta spanning from the resonance peak
at the commensurate momentum $(\pi,\pi)$. We propose the two-component
spin-fermion model as a minimal phenomenological model which has both local
spins and itinerant fermions as independent degrees of freedom. Our
calculations of the dynamic spin correlation function provide good agreement
with experiments and show: (1) the upward dispersion branch of magnetic
excitations is mostly due to the local spin excitations; (2) the downward
dispersion branch is from collective spin excitations of fermions; (3) the
resonance mode is a mixture of both degrees of freedom.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 01:56:59 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Jun 2007 01:16:41 GMT"
}
] | 2007-06-17T00:00:00 | [
[
"Bang",
"Yunkyu",
""
]
] |
0706.1388 | Benjamin Webster | Nadya Shirokova, Ben Webster | Wall-Crossing Morphisms in Khovanov-Rozansky Homology | 11 pages, no figures | null | null | null | math.GT math.QA | null | We define a wall-crossing morphism for Khovanov-Rozansky homology; that is, a
map between the KR homology of knots related by a crossing change. Using this
map, we extend KR homology to an invariant of singular knots categorifying the
Vasilliev derivative of the HOMFLY polynomial, and of $\mathfrak{sl}_n$ quantum
invariants.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 02:05:27 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Shirokova",
"Nadya",
""
],
[
"Webster",
"Ben",
""
]
] |
0706.1389 | Natsuhiko Yoshinaga | Natsuhiko Yoshinaga and Kenichi Yoshikawa | Core-shell structures in single flexible-semiflexible block copolymers:
Finding the free energy minimum for the folding transition | null | null | 10.1063/1.2753838 | null | cond-mat.soft | null | We investigate the folding transition of a single diblock copolymer
consisting of a semiflexible and a flexible block. We obtain a {\it
Saturn-shaped} core-shell conformation in the folded state, in which the
flexible block forms a core and the semiflexible block wraps around it. We
demonstrate two distinctive features of the core-shell structures: (i) The
kinetics of the folding transition in the copolymer are significantly more
efficient than those of a semiflexible homopolymer. (ii) The core-shell
structure does not depend on the transition pathway.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 02:07:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yoshinaga",
"Natsuhiko",
""
],
[
"Yoshikawa",
"Kenichi",
""
]
] |
0706.1390 | Yves Colombe | Yves Colombe, Tilo Steinmetz, Guilhem Dubois, Felix Linke, David
Hunger, Jakob Reichel | Strong atom-field coupling for Bose-Einstein condensates in an optical
cavity on a chip | 20 pages. Revised version following referees' comments. Detailed
notes added | Nature 450, 272-276 (2007) | 10.1038/nature06331 | null | quant-ph | null | An optical cavity enhances the interaction between atoms and light, and the
rate of coherent atom-photon coupling can be made larger than all decoherence
rates of the system. For single atoms, this strong coupling regime of cavity
quantum electrodynamics (cQED) has been the subject of spectacular experimental
advances, and great efforts have been made to control the coupling rate by
trapping and cooling the atom towards the motional ground state, which has been
achieved in one dimension so far. For N atoms, the three-dimensional ground
state of motion is routinely achieved in atomic Bose-Einstein condensates
(BECs), but although first experiments combining BECs and optical cavities have
been reported recently, coupling BECs to strong-coupling cavities has remained
an elusive goal. Here we report such an experiment, which is made possible by
combining a new type of fibre-based cavity with atom chip technology. This
allows single-atom cQED experiments with a simplified setup and realizes the
new situation of N atoms in a cavity each of which is identically and strongly
coupled to the cavity mode. Moreover, the BEC can be positioned
deterministically anywhere within the cavity and localized entirely within a
single antinode of the standing-wave cavity field. This gives rise to a
controlled, tunable coupling rate, as we confirm experimentally. We study the
heating rate caused by a cavity transmission measurement as a function of the
coupling rate and find no measurable heating for strongly coupled BECs. The
spectrum of the coupled atoms-cavity system, which we map out over a wide range
of atom numbers and cavity-atom detunings, shows vacuum Rabi splittings
exceeding 20 gigahertz, as well as an unpredicted additional splitting which we
attribute to the atomic hyperfine structure.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 02:14:36 GMT"
},
{
"version": "v2",
"created": "Fri, 12 Oct 2007 13:20:14 GMT"
}
] | 2007-11-10T00:00:00 | [
[
"Colombe",
"Yves",
""
],
[
"Steinmetz",
"Tilo",
""
],
[
"Dubois",
"Guilhem",
""
],
[
"Linke",
"Felix",
""
],
[
"Hunger",
"David",
""
],
[
"Reichel",
"Jakob",
""
]
] |
0706.1391 | Dmitry Novikov | D. S. Novikov | Elastic scattering theory and transport in graphene | 17 pages, 4 figures. Published version | Phys. Rev. B 76, 245435 (2007) | 10.1103/PhysRevB.76.245435 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Electron properties of graphene are described in terms of Dirac fermions.
Here we thoroughly outline the elastic scattering theory for the
two-dimensional massive Dirac fermions in the presence of an axially symmetric
potential. While the massless limit is relevant for pristine graphene, keeping
finite mass allows for generalizations onto situations with broken symmetry
between the two sublattices, and provides a link to the scattering theory of
electrons in a parabolic band. We demonstrate that the Dirac theory requires
short-distance regularization for potentials which are more singular than 1/r.
The formalism is then applied to scattering off a smooth short-ranged
potential. Next we consider the Coulomb potential scattering, where the Dirac
theory is consistent for a point scatterer only for the effective impurity
strength below 1/2. From the scattering phase shifts we obtain the exact
Coulomb transport cross-section in terms of the impurity strength. The results
are relevant for transport in graphene in the presence of impurities that do
not induce scattering between the Dirac points in the Brillouin zone.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 14:47:12 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Jun 2007 20:16:06 GMT"
},
{
"version": "v3",
"created": "Fri, 28 Dec 2007 22:52:48 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Novikov",
"D. S.",
""
]
] |
0706.1392 | Hiroshi Suzuki | Hiroshi Suzuki | Two-dimensional N=(2,2) super Yang-Mills theory on computer | 24 pages, 10 figures, the distribution of the complex phase of the
pffafian is also measured, the final version to appear in JHEP | JHEP0709:052,2007 | 10.1088/1126-6708/2007/09/052 | RIKEN-TH-103 | hep-lat hep-th | null | We carry out preliminary numerical study of Sugino's lattice formulation
\cite{Sugino:2004qd,Sugino:2004qdf} of the two-dimensional $\mathcal{N}=(2,2)$
super Yang-Mills theory (2d $\mathcal{N}=(2,2)$ SYM) with the gauge group
$\SU(2)$. The effect of dynamical fermions is included by re-weighting a
quenched ensemble by the pfaffian factor. It appears that the complex phase of
the pfaffian due to lattice artifacts and flat directions of the classical
potential are not problematic in Monte Carlo simulation. Various one-point
supersymmetric Ward-Takahashi (WT) identities are examined for lattice spacings
up to $a=0.5/g$ with the fixed physical lattice size $L=4.0/g$, where $g$
denotes the gauge coupling constant in two dimensions. WT identities implied by
an exact fermionic symmetry of the formulation are confirmed in fair accuracy
and, for most of these identities, the quantum effect of dynamical fermions is
clearly observed. For WT identities expected only in the continuum limit, the
results seem to be consistent with the behavior expected from supersymmetry,
although we do not see clear distintion from the quenched simulation. We
measure also the expectation values of renormalized gauge-invariant bi-linear
operators of scalar fields.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 02:44:19 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Jun 2007 02:37:06 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Sep 2007 02:01:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Suzuki",
"Hiroshi",
""
]
] |
0706.1393 | Menni Matias | M. Menni, N. Sabadini and R. F. C. Walters | A universal property of the monoidal 2-category of cospans of finite
linear orders and surjections | null | null | null | null | math.CT | null | We prove that the monoidal 2-category of cospans of finite linear orders and
surjections is the universal monoidal category with an object X with a
semigroup and a cosemigroup structures, where the two structures satisfy a
certain 2-dimensional separable algebra condition.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 03:27:12 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Menni",
"M.",
""
],
[
"Sabadini",
"N.",
""
],
[
"Walters",
"R. F. C.",
""
]
] |
0706.1394 | Vincenzo Lombardo | V. Lombardo (for the BABAR Collaboration) | Measurement of the CKM angles alpha and gamma at the BaBar experiment | 5 pages, contributed to the Proceedings of Lake Louise Winter
Institute 2007: Fundamental Interactions, Lake Louise, Alberta, Canada 19-24
Feb 2007 | null | 10.1142/9789812776105_0033 | SLAC-PUB-12530 | hep-ex | null | We present recent measurements of the CKM angles alpha and gamma using data
collected by the BaBar detector at the PEP-II asymmetric-energy e+ e- collider
at the Stanford Linear Accelerator Center. In addition to constraints on alpha
from the decays B0 -> pi+ pi-, B0 -> rho+ pi- and B0 -> rho+ rho-, we also
report the first measurement of time-dependent CP asymmetries in the decay B0
-> a1+(1260) pi-. We present measurements of gamma in B+ -> D(*)0 K+ decays
using a Dalitz analysis in the modes D^0 -> Ks pi+ pi- and D^0 -> pi+ pi- pi0.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 03:41:11 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Lombardo",
"V.",
"",
"for the BABAR Collaboration"
]
] |
0706.1395 | Hulya Seferoglu | Hulya Seferoglu, Athina Markopoulou | Opportunistic Network Coding for Video Streaming over Wireless | 11 pages, 8 figures (14 subfigures) | null | null | null | cs.NI | null | In this paper, we study video streaming over wireless networks with network
coding capabilities. We build upon recent work, which demonstrated that network
coding can increase throughput over a broadcast medium, by mixing packets from
different flows into a single packet, thus increasing the information content
per transmission. Our key insight is that, when the transmitted flows are video
streams, network codes should be selected so as to maximize not only the
network throughput but also the video quality. We propose video-aware
opportunistic network coding schemes that take into account both (i) the
decodability of network codes by several receivers and (ii) the importance and
deadlines of video packets. Simulation results show that our schemes
significantly improve both video quality and throughput.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 17:33:25 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Seferoglu",
"Hulya",
""
],
[
"Markopoulou",
"Athina",
""
]
] |
0706.1396 | Vladimir Baranovsky | Vladimir Baranovsky | A universal enveloping for L-infinity algebras | null | null | null | null | math.RT math.RA | null | For any L-infinity algebra L, we construct an A-infinity structure on the
space of symmetric tensors Sym*(L), which generalizes the classical universal
enveloping for Lie algebras. Our construction is based on an invariant homotopy
on a cobar construction of the symmetric coalgebra, which is obtained through
its relation with permutahedra and Young tableaux.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 04:31:01 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Baranovsky",
"Vladimir",
""
]
] |
0706.1397 | Nobuhito Maru | C.S. Lim and Nobuhito Maru | Towards A Realistic Grand Gauge-Higgs Unification | 11 pages, 5 eps files, Final version to appear in PLB | Phys.Lett.B653:320-324,2007 | 10.1016/j.physletb.2007.07.053 | KOBE-TH-07-04 | hep-ph | null | We investigate a 5D SU(6) grand gauge-Higgs unification model compactified on
an orbifold S^1/Z_2. Ordinary quarks and leptons, together with right-handed
neutrinos, are just accommodated into a minimal set of representations of the
gauge group, without introducing any exotic states. The proton decay turns out
to be forbidden at least at the tree level. We also find a correct electroweak
symmetry breaking SU(2)_L \times U(1)_Y \to U(1)_{em} is easily realized by
introducing suitable number of adjoint fermions.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 04:33:56 GMT"
},
{
"version": "v2",
"created": "Sat, 11 Aug 2007 23:50:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lim",
"C. S.",
""
],
[
"Maru",
"Nobuhito",
""
]
] |
0706.1398 | Vladimir Baranovsky | Vladimir Baranovsky | BGG correspondence for toric complete intersections | null | null | null | null | math.RT math.AG | null | We generalize the classical Bernstein-Gelfand-Gelfand correspondence to
complete intersections in toric varieties.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 04:36:13 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Baranovsky",
"Vladimir",
""
]
] |
0706.1399 | Viveck Cadambe | Viveck R. Cadambe and Syed A. Jafar | Duality and Stability Regions of Multi-rate Broadcast and Multiple
Access Networks | 12 pages, 11 figures, submitted to IEEE Trans. Information Theory for
review | null | null | null | cs.IT math.IT | null | We characterize stability regions of two-user fading Gaussian multiple access
(MAC) and broadcast (BC) networks with centralized scheduling. The data to be
transmitted to the users is encoded into codewords of fixed length. The rates
of the codewords used are restricted to a fixed set of finite cardinality. With
successive decoding and interference cancellation at the receivers, we find the
set of arrival rates that can be stabilized over the MAC and BC networks. In
MAC and BC networks with average power constraints, we observe that the duality
property that relates the MAC and BC information theoretic capacity regions
extend to their stability regions as well. In MAC and BC networks with peak
power constraints, the union of stability regions of dual MAC networks is found
to be strictly contained in the BC stability region.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 04:43:13 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Cadambe",
"Viveck R.",
""
],
[
"Jafar",
"Syed A.",
""
]
] |
0706.1400 | Roby Cherian | Priya Mahadevan, Roby Cherian, K.J. Sankaran, and D.D. Sarma | Electronic structure of NaWO$_3$: Role of the impurity potential | 16 pages, 7 figures | null | null | null | cond-mat.mtrl-sci | null | We have performed {\it ab-initio} electronic structure calculations to
determine the evolution of the electronic structure of WO$_3$ with Na doping.
Na doping introduces an additional electron when introduced into WO$_3$. The
ensuing electronic structure of Na doped WO$_3$, we find, is very similar to
the electronic structure of an electron introduced into WO$_3$, thus clarifying
the role of the impurity potential due to Na. While the electronic structure of
NaWO$_3$ allows a rigid band like description over a certain energy range,
modifications introduced in the electronic structure can be related back to the
electron due to Na and not the impurity potential that one generally believes
to be responsible.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 05:32:41 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Mahadevan",
"Priya",
""
],
[
"Cherian",
"Roby",
""
],
[
"Sankaran",
"K. J.",
""
],
[
"Sarma",
"D. D.",
""
]
] |
0706.1401 | J.R. Lockwood | J.R. Lockwood, Daniel F. McCaffrey | Controlling for individual heterogeneity in longitudinal models, with
applications to student achievement | Published at http://dx.doi.org/10.1214/07-EJS057 in 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 2007, Vol. 1, 223-252 | 10.1214/07-EJS057 | IMS-EJS-EJS_2007_57 | stat.AP | null | Longitudinal data tracking repeated measurements on individuals are highly
valued for research because they offer controls for unmeasured individual
heterogeneity that might otherwise bias results. Random effects or mixed models
approaches, which treat individual heterogeneity as part of the model error
term and use generalized least squares to estimate model parameters, are often
criticized because correlation between unobserved individual effects and other
model variables can lead to biased and inconsistent parameter estimates.
Starting with an examination of the relationship between random effects and
fixed effects estimators in the standard unobserved effects model, this article
demonstrates through analysis and simulation that the mixed model approach has
a ``bias compression'' property under a general model for individual
heterogeneity that can mitigate bias due to uncontrolled differences among
individuals. The general model is motivated by the complexities of longitudinal
student achievement measures, but the results have broad applicability to
longitudinal modeling.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 05:57:04 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Lockwood",
"J. R.",
""
],
[
"McCaffrey",
"Daniel F.",
""
]
] |
0706.1402 | Matthias Brust R. | Matthias R. Brust, Steffen Rothkugel | Analyzing Design Process and Experiments on the AnITA Generic Tutoring
System | Published in: Proceedings of International Conference on Education
and Information Systems (EISTA 04), 2004, ISBN 980-6560-11-6 | null | null | null | cs.CY cs.HC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the field of tutoring systems, investigations have shown that there are
many tutoring systems specific to a specific domain that, because of their
static architecture, cannot be adapted to other domains. As consequence, often
neither methods nor knowledge can be reused. In addition, the knowledge
engineer must have programming skills in order to enhance and evaluate the
system. One particular challenge is to tackle these problems with the
development of a generic tutoring system. AnITA, as a stand-alone application,
has been developed and implemented particularly for this purpose. However, in
the testing phase, we discovered that this architecture did not fully match the
user's intuitive understanding of the use of a learning tool. Therefore, AnITA
has been redesigned to exclusively work as a client/server application and
renamed to AnITA2. This paper discusses the evolvements made on the AnITA
tutoring system, the goal of which is to use generic principles for system
re-use in any domain. Two experiments were conducted, and the results are
presented in this paper.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 06:09:25 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jun 2018 19:54:33 GMT"
}
] | 2018-06-14T00:00:00 | [
[
"Brust",
"Matthias R.",
""
],
[
"Rothkugel",
"Steffen",
""
]
] |
0706.1403 | Samvel Badalyan | S. M. Badalyan, G. Vignale, and C. S. Kim | Spin Coulomb drag beyond the random phase approximation | 3 figures, accepted for publication in Phys. Rev. Lett | Phys. Rev. Lett. 100, 016603 (2008) | 10.1103/PhysRevLett.100.016603 | null | cond-mat.mes-hall | null | We study the spin Coulomb drag in a quasi-two-dimensional electron gas beyond
the random phase approximation (RPA). We find that the finite transverse width
of the electron gas causes a significant reduction of the spin Coulomb drag.
This reduction, however, is largely compensated by the enhancement coming from
the inclusion of many-body local field effects beyond the RPA, thereby
restoring good agreement with the experimental observations by C. P. Weber
\textit{et al.}, Nature, \textbf{437}, 1330 (2005).
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 06:16:19 GMT"
},
{
"version": "v2",
"created": "Mon, 12 Nov 2007 15:26:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Badalyan",
"S. M.",
""
],
[
"Vignale",
"G.",
""
],
[
"Kim",
"C. S.",
""
]
] |
0706.1404 | Annie Millet | Istvan Gy\"ongy, Annie Millet (CES, Samos, Pma) | Rate of Convergence of Space Time Approximations for stochastic
evolution equations | 33 pages | Potential Analysis 30, 1 (2009) 29-64 | 10.1007/s11118-008-9105-5 | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stochastic evolution equations in Banach spaces with unbounded nonlinear
drift and diffusion operators driven by a finite dimensional Brownian motion
are considered. Under some regularity condition assumed for the solution, the
rate of convergence of various numerical approximations are estimated under
strong monotonicity and Lipschitz conditions. The abstract setting involves
general consistency conditions and is then applied to a class of quasilinear
stochastic PDEs of parabolic type.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 06:32:06 GMT"
},
{
"version": "v2",
"created": "Tue, 30 Sep 2008 06:53:53 GMT"
}
] | 2009-01-20T00:00:00 | [
[
"Gyöngy",
"Istvan",
"",
"CES, Samos, Pma"
],
[
"Millet",
"Annie",
"",
"CES, Samos, Pma"
]
] |
0706.1405 | Christos Athanasiadis | Christos A. Athanasiadis and Myrto Kallipoliti | The absolute order on the symmetric group, constructible partially
ordered sets and Cohen-Macaulay complexes | Final version (only minor changes), 10 pages, one figure | null | null | null | math.CO | null | The absolute order is a natural partial order on a Coxeter group W. It can be
viewed as an analogue of the weak order on W in which the role of the
generating set of simple reflections in W is played by the set of all
reflections in W. By use of a notion of constructibility for partially ordered
sets, it is proved that the absolute order on the symmetric group is homotopy
Cohen-Macaulay. This answers in part a question raised by V. Reiner and the
first author. The Euler characteristic of the order complex of the proper part
of the absolute order on the symmetric group is also computed.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 13:06:21 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Jan 2008 10:47:31 GMT"
}
] | 2008-01-07T00:00:00 | [
[
"Athanasiadis",
"Christos A.",
""
],
[
"Kallipoliti",
"Myrto",
""
]
] |
0706.1406 | Wolfgang Bertram | Wolfgang Bertram (IECN) | Jordan structures and non-associative geometry | 20 pages | null | null | null | math.RA | null | In this survey paper we give an overview over constructions of geometries
associated to Jordan structures (algebras, triple systems and pairs), featuring
analogs of these constructions with the Lie functor on the one hand and with
the approach of non-commutative geometry on the other hand.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 06:32:45 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Bertram",
"Wolfgang",
"",
"IECN"
]
] |
0706.1407 | Trimeche Khalifa | Trimeche Khalifa | Absolute continuity of the measures of the Dunkl intetwining operator
and its dualand applications | null | null | null | null | math.FA math.CA | null | In this paper we consider the representing measures $\mu_{x},x\in
\QTR{Bbb}{R}^{d}$, and $\nu_{y},y\in \QTR{Bbb}{R}^{d}$, of the Dunkl
intertwining operator and of its dual. When the multiplicity function is
positive, we prove that for all $x\in \QTR{Bbb}{R}_{\QTO{mbox}{reg}}^{d}$ we
have $d\mu_{x}(y)=\QTR{cal}{K}(x,y)dy$ and for almost all $y\in
\QTR{Bbb}{R}^{d}$ we have $d\nu_{y}(x)=\QTR{cal}{K}(x,y)\omega_{k}(x)dx,$ where
$\QTR{cal}{K}(x,.)$ is a positive integrable function on $\QTR{Bbb}{R}^{d}$
with support in $\{y\in \QTR{Bbb}{R}^{d}/\Vert y\Vert \leq \Vert x\Vert \}$ and
the function $\QTR{cal}{K}(.,y)$ is locally integrable on $\QTR{Bbb}{R}^{d}$
with respect to the measure $\omega_{k}(x)dx$ and with support in $\{x\in
\QTR{Bbb}{R}^{d}/\Vert x\Vert \geq \Vert y\Vert \}$. Next we present some
applications of this result.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 06:35:14 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Khalifa",
"Trimeche",
""
]
] |
0706.1408 | Luke A. Prendergast | Luke A. Prendergast, Jodie A. Smith | Sensitivity of principal Hessian direction analysis | Published at http://dx.doi.org/10.1214/07-EJS064 in 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 2007, Vol. 1, 253-267 | 10.1214/07-EJS064 | IMS-EJS-EJS_2007_64 | stat.ME | null | We provide sensitivity comparisons for two competing versions of the
dimension reduction method principal Hessian directions (pHd). These
comparisons consider the effects of small perturbations on the estimation of
the dimension reduction subspace via the influence function. We show that the
two versions of pHd can behave completely differently in the presence of
certain observational types. Our results also provide evidence that outliers in
the traditional sense may or may not be highly influential in practice. Since
influential observations may lurk within otherwise typical data, we consider
the influence function in the empirical setting for the efficient detection of
influential observations in practice.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 06:36:56 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Prendergast",
"Luke A.",
""
],
[
"Smith",
"Jodie A.",
""
]
] |
0706.1409 | Bruno Salvy | Jonathan M. Borwein, Bruno Salvy (INRIA Rocquencourt) | A Proof of a Recursion for Bessel Moments | null | null | 10.1080/10586458.2008.10129032 | null | cs.SC math.CA | null | We provide a proof of a conjecture in (Bailey, Borwein, Borwein, Crandall
2007) on the existence and form of linear recursions for moments of powers of
the Bessel function $K_0$.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 06:45:39 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Apr 2008 14:52:49 GMT"
}
] | 2013-06-19T00:00:00 | [
[
"Borwein",
"Jonathan M.",
"",
"INRIA Rocquencourt"
],
[
"Salvy",
"Bruno",
"",
"INRIA Rocquencourt"
]
] |
0706.1410 | Marc Schoenauer | Francis Sourd (CMAP), Marc Schoenauer (CMAP) | Evolutionary Mesh Numbering: Preliminary Results | null | Dans Adaptive Computing in Design and Manufacture, ACDM'98 (1998)
137-150 | null | null | cs.NA cs.NE math.NA math.OC | null | Mesh numbering is a critical issue in Finite Element Methods, as the
computational cost of one analysis is highly dependent on the order of the
nodes of the mesh. This paper presents some preliminary investigations on the
problem of mesh numbering using Evolutionary Algorithms. Three conclusions can
be drawn from these experiments. First, the results of the up-to-date method
used in all FEM softwares (Gibb's method) can be consistently improved; second,
none of the crossover operators tried so far (either general or problem
specific) proved useful; third, though the general tendency in Evolutionary
Computation seems to be the hybridization with other methods (deterministic or
heuristic), none of the presented attempt did encounter any success yet. The
good news, however, is that this algorithm allows an improvement over the
standard heuristic method between 12% and 20% for both the 1545 and 5453-nodes
meshes used as test-bed. Finally, some strange interaction between the
selection scheme and the use of problem specific mutation operator was
observed, which appeals for further investigation.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 12:17:19 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Sourd",
"Francis",
"",
"CMAP"
],
[
"Schoenauer",
"Marc",
"",
"CMAP"
]
] |
0706.1411 | Arpad Hegedus | Arpad Hegedus | Finite size effects and 2-string deviations in the spin-1 XXZ chains | null | J.Phys.A40:12007-12032,2007 | 10.1088/1751-8113/40/40/001 | null | hep-th | null | In an earlier work [1] J. Suzuki proposed a set of nonlinear integral
equations (NLIE) to describe the excited state spectrum of the integrable
spin-1 XXZ chain in its repulsive regime. In this paper we extend his equations
for the attractive regime of the model, and calculate analytically the
conformal spectrum of the spin chain. We also discuss the typical root
configurations of the thermodynamic limit as well as the 2-string deviations of
certain excited states of the model. Special objects appearing in the NLIE are
also treated with special care.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 07:12:47 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Aug 2007 15:42:40 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hegedus",
"Arpad",
""
]
] |
0706.1412 | Jounghun Lee | Jounghun Lee (Seoul Nat'l Univ.), Pirin Erdogdu (Univ. of Nottingham) | The Alignments of the Galaxy Spins with the Real-Space Tidal Field
Reconstructed from the Two Mass Redshift Survey | accepted by ApJ, revised version, 23 pages, 7 figures, significantly
improved, all types of spiral galaxies analyzed, the azimuthal angle
distributions newly derived, a new conclusion on the morphological dependence
of the shear-spin correlations drawn, the environmental dependence of the
shear-spin correlations shown | Astrophys.J. 671 (2007) 1248-1255 | 10.1086/523351 | null | astro-ph | null | We report a direct observational evidence for the existence of the galaxy
spin alignments with the real space tidal field. We calculate the real space
tidal field from the real space density field reconstructed recently from the
Two Mass Redshift Survey (2MRS) by Erdogdu et al. in 2006. Using a total of
12122 nearby spiral galaxies from the Tully Galaxy Catalog, we calculate the
orientations of their spin axes relative to the 2MRS tidal field. We find a
clear signal of the intrinsic correlations between the galaxy spins and the
intermediate principal axes of the tidal shears. The null hypothesis of no
correlation is rejected at 99.99 % confidence level. We also investigate the
dependence of the intrinsic correlations on the galaxy morphological type and
the environment. It is found that (i) the intrinsic correlation depends weakly
on the morphological type of the spiral galaxies but tends to decrease slightly
as the type increases; (ii) it is stronger in the high-density regions than in
the low-density regions. The observational result is quantitatively consistent
with analytic prediction based on the tidal torque theory. It is concluded that
the galaxy spin orientations may provide in principle a new complimentary probe
of the dark matter distribution.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 07:33:25 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Sep 2007 22:41:14 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lee",
"Jounghun",
"",
"Seoul Nat'l Univ."
],
[
"Erdogdu",
"Pirin",
"",
"Univ. of Nottingham"
]
] |
0706.1413 | Azhar Iqbal | Azhar Iqbal and Taksu Cheon (Kochi University of Technology) | Evolutionary stability in quantum games | 38 pages, 2 figures, contributed chapter to the book "Quantum Aspects
of Life" edited by D. Abbott, P. Davies and A. Pati | null | 10.1142/9781848162556_0013 | null | quant-ph | null | In evolutionary game theory an Evolutionarily Stable Strategy (ESS) is a
refinement of the Nash equilibrium concept that is sometimes also recognized as
evolutionary stability. It is a game-theoretic model, well known to
mathematical biologists, that was found quite useful in the understanding of
evolutionary dynamics of a population. This chapter presents an analysis of
evolutionary stability in the emerging field of quantum games.
| [
{
"version": "v1",
"created": "Mon, 11 Jun 2007 08:05:19 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jun 2007 02:09:33 GMT"
}
] | 2016-12-21T00:00:00 | [
[
"Iqbal",
"Azhar",
"",
"Kochi University of Technology"
],
[
"Cheon",
"Taksu",
"",
"Kochi University of Technology"
]
] |
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