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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0704.3701 | John Weiner | J. Weiner | Comment on ``Enhanced transmission of light through a gold film due to
excitation of standing surface-plasmon Bloch waves" | This posting is a comment on an article, I. I. Smolyaninov and Y.-J.
Hung, Phys. Rev. B 75, 033411 (2007) | null | 10.1103/PhysRevB.77.036401 | null | physics.optics | null | The purpose of this comment is first to correct a misapprehension of the role
played by composite wave diffraction on surface-wave generation at
subwavelength structures and second to point out that periodic Bloch structures
are unnecessary for the efficient production of the surface plasmon polariton
(SPP) guided mode either as traveling or standing waves. Guided surface waves
originate from simple slit or groove edges illuminated under normal incidence,
and one-dimensional (1-D) surface cavities from these standing waves are easily
realized.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 15:46:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Weiner",
"J.",
""
]
] |
0704.3702 | Bartlomiej Waclaw | B. Waclaw | Statistical mechanics of complex networks | 78 pages, based on PhD thesis, see the Preface for more comments | null | null | null | cond-mat.stat-mech | null | The science of complex networks is a new interdisciplinary branch of science
which has arisen recently on the interface of physics, biology, social and
computer sciences, and others. Its main goal is to discover general laws
governing the creation and growth as well as processes taking place on
networks, like e.g. the Internet, transportation or neural networks. It turned
out that most real-world networks cannot be simply reduced to a compound of
some individual components. Fortunately, the statistical mechanics, being one
of pillars of modern physics, provides us with a very powerful set of tools and
methods for describing and understanding these systems. In this thesis, we
would like to present a consistent approach to complex networks based on
statistical mechanics, with the central role played by the concept of
statistical ensemble of networks. We show how to construct such a theory and
present some practical problems where it can be applied. Among them, we pay
attention to the problem of finite-size corrections and the dynamics of a
simple model of mass transport on networks.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 15:44:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Waclaw",
"B.",
""
]
] |
0704.3703 | Jeroen Vandenbrink | Jasper van Wezel and Jeroen van den Brink | Thin Spectrum States in Superconductors | 4 pages, 2 figures | Physica B, 403, 3206-3210 (2008) | 10.1016/j.physb.2008.04.020 | null | cond-mat.supr-con cond-mat.str-el | null | We show that finite size superconductors have a spectrum of states at
extremely low energy, i.e. inside the superconducting gap. The presence of this
{\it thin spectrum} is a generic feature and related to the fact that in a
superconductor the global phase rotation symmetry is spontaneously broken. For
a strong coupling superconductor we find the spectrum by exactly solving the
Lieb-Mattis type Hamiltonian onto which the problem maps. One of the physical
consequences of the presence of thin states is that they cause quantum
decoherence in superconducting qubits of finite extent.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 16:13:28 GMT"
}
] | 2015-06-29T00:00:00 | [
[
"van Wezel",
"Jasper",
""
],
[
"Brink",
"Jeroen van den",
""
]
] |
0704.3704 | Farhan Feroz | Farhan Feroz, M.P. Hobson | Multimodal nested sampling: an efficient and robust alternative to MCMC
methods for astronomical data analysis | 14 pages, 11 figures, submitted to MNRAS, some major additions to the
previous version in response to the referee's comments | Mon. Not. Roy. Astron. Soc., 384, 2, 449-463 (2008) | 10.1111/j.1365-2966.2007.12353.x | null | astro-ph | null | In performing a Bayesian analysis of astronomical data, two difficult
problems often emerge. First, in estimating the parameters of some model for
the data, the resulting posterior distribution may be multimodal or exhibit
pronounced (curving) degeneracies, which can cause problems for traditional
MCMC sampling methods. Second, in selecting between a set of competing models,
calculation of the Bayesian evidence for each model is computationally
expensive. The nested sampling method introduced by Skilling (2004), has
greatly reduced the computational expense of calculating evidences and also
produces posterior inferences as a by-product. This method has been applied
successfully in cosmological applications by Mukherjee et al. (2006), but their
implementation was efficient only for unimodal distributions without pronounced
degeneracies. Shaw et al. (2007), recently introduced a clustered nested
sampling method which is significantly more efficient in sampling from
multimodal posteriors and also determines the expectation and variance of the
final evidence from a single run of the algorithm, hence providing a further
increase in efficiency. In this paper, we build on the work of Shaw et al. and
present three new methods for sampling and evidence evaluation from
distributions that may contain multiple modes and significant degeneracies; we
also present an even more efficient technique for estimating the uncertainty on
the evaluated evidence. These methods lead to a further substantial improvement
in sampling efficiency and robustness, and are applied to toy problems to
demonstrate the accuracy and economy of the evidence calculation and parameter
estimation. Finally, we discuss the use of these methods in performing Bayesian
object detection in astronomical datasets.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:25:09 GMT"
},
{
"version": "v2",
"created": "Sat, 28 Apr 2007 12:32:01 GMT"
},
{
"version": "v3",
"created": "Mon, 23 Jul 2007 13:27:57 GMT"
}
] | 2010-01-11T00:00:00 | [
[
"Feroz",
"Farhan",
""
],
[
"Hobson",
"M. P.",
""
]
] |
0704.3705 | Nikolaos Papanikolaou | Simon Gay, Rajagopal Nagarajan, Nikolaos Papanikolaou | QMC: A Model Checker for Quantum Systems | null | null | null | null | quant-ph | null | We introduce a model-checking tool intended specially for the analysis of
quantum information protocols. The tool incorporates an efficient
representation of a certain class of quantum circuits, namely those expressible
in the so-called stabiliser formalism. Models of protocols are described using
a simple, imperative style simulation language which includes commands for the
unitary operators in the Clifford group as well as classical integer and
boolean variables. Formulas for verification are expressed using a subset of
quantum computational tree logic (QCTL). The model-checking procedure treats
quantum measurements as the source of non-determinism, leading to multiple
protocol runs, one for each outcome. Verification is performed for each run.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 16:26:56 GMT"
},
{
"version": "v2",
"created": "Sun, 29 Apr 2007 16:03:10 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Apr 2008 11:21:26 GMT"
}
] | 2008-04-21T00:00:00 | [
[
"Gay",
"Simon",
""
],
[
"Nagarajan",
"Rajagopal",
""
],
[
"Papanikolaou",
"Nikolaos",
""
]
] |
0704.3706 | Jo\~ao Bastos | J. Bastos, Y. Liu | A multivariate approach to heavy flavour tagging with cascade training | 14 pages, 12 figures, revised version | JINST 2:P11007,2007 | 10.1088/1748-0221/2/11/P11007 | null | physics.data-an | null | This paper compares the performance of artificial neural networks and boosted
decision trees, with and without cascade training, for tagging b-jets in a
collider experiment. It is shown, using a Monte Carlo simulation of $WH \to
l\nu q\bar{q}$ events, that for a b-tagging efficiency of 50%, the light jet
rejection power given by boosted decision trees without cascade training is
about 55% higher than that given by artificial neural networks. The cascade
training technique can improve the performance of boosted decision trees and
artificial neural networks at this b-tagging efficiency level by about 35% and
80% respectively. We conclude that the cascade trained boosted decision trees
method is the most promising technique for tagging heavy flavours at collider
experiments.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:06:48 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Nov 2007 15:30:01 GMT"
}
] | 2011-01-27T00:00:00 | [
[
"Bastos",
"J.",
""
],
[
"Liu",
"Y.",
""
]
] |
0704.3707 | Drago Alessandro | Luca Bonanno (Dip.Fisica Univ.Ferrara and INFN sez Ferrara),
Alessandro Drago (Dip.Fisica Univ.Ferrara and INFN sez Ferrara), Andrea
Lavagno (Politecnico di Torino and INFN sez. Torino) | Softening of the equation of state of matter at large densities and
temperatures: chiral symmetry restoration vs. quark deconfinement | 4 pages, 4 figures, editorially accepted version | Phys.Rev.Lett.99:242301,2007; PoS CPOD07:061,2007 | 10.1103/PhysRevLett.99.242301 | null | hep-ph nucl-th | null | We discuss two models for describing the behavior of matter at large
densities and intermediate temperatures. In both models a softening of the
equation of state takes place due to the appearance of new degrees of freedom.
The first is a hadronic model in which the softening is due to chiral symmetry
restoration. In the second model the softening is associated with the formation
of clusters of quarks in the mixed phase. We show that both models allow a
significant softening but, in the first case the bulk modulus is mainly
dependent on the density, while in the mixed phase model it also strongly
depends on the temperature. We also show that the bulk modulus is not vanishing
in the mixed phase due to the presence of two conserved charges, the baryon and
the isospin one. Only in a small region of densities and temperatures the
incompressibility becomes extremely small. Finally we compare our results with
recent analysis of heavy ion collisions at intermediate energies.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:12:04 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Dec 2007 18:50:05 GMT"
}
] | 2009-04-21T00:00:00 | [
[
"Bonanno",
"Luca",
"",
"Dip.Fisica Univ.Ferrara and INFN sez Ferrara"
],
[
"Drago",
"Alessandro",
"",
"Dip.Fisica Univ.Ferrara and INFN sez Ferrara"
],
[
"Lavagno",
"Andrea",
"",
"Politecnico di Torino and INFN sez. Torino"
]
] |
0704.3708 | Bernat Corominas-Murtra BCM | Bernat Corominas-Murtra | Network statistics on early English Syntax: Structural criteria | New abstract. Due to a mistake, abstract from V1 was from an old,
draft version of the work. The content of the paper is exactly the same,
except on section "measures" where a new cite has been added. 28 pag | null | null | null | cs.CL | null | This paper includes a reflection on the role of networks in the study of
English language acquisition, as well as a collection of practical criteria to
annotate free-speech corpora from children utterances. At the theoretical
level, the main claim of this paper is that syntactic networks should be
interpreted as the outcome of the use of the syntactic machinery. Thus, the
intrinsic features of such machinery are not accessible directly from (known)
network properties. Rather, what one can see are the global patterns of its use
and, thus, a global view of the power and organization of the underlying
grammar. Taking a look into more practical issues, the paper examines how to
build a net from the projection of syntactic relations. Recall that, as opposed
to adult grammars, early-child language has not a well-defined concept of
structure. To overcome such difficulty, we develop a set of systematic criteria
assuming constituency hierarchy and a grammar based on lexico-thematic
relations. At the end, what we obtain is a well defined corpora annotation that
enables us i) to perform statistics on the size of structures and ii) to build
a network from syntactic relations over which we can perform the standard
measures of complexity. We also provide a detailed example.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:13:37 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Apr 2007 10:06:50 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Corominas-Murtra",
"Bernat",
""
]
] |
0704.3709 | Anton Lipovka | A. Lipovka, N. Lipovka | The end of the "Empty Field" epoch in optical identifications | 2 pages, 2 figures, International meeting "Molecules in Space &
Laboratory", Paris, France May 14-18, 2007 | null | null | null | astro-ph | null | In order to obtain more comprehensive information about an celestial object,
the radio image must be identified with the optical one. Many years the
identification process is carried out with the coordinate coincidence criteria,
which leads to abundant misidentifications and "empty field" in optics for the
radio sources. For this reason significant part of radio sources do not have
identifications in optic. In present paper we consider the radio refraction in
the Galaxy, which significantly changes the coordinates of radio sources if
compared with the optical one. By taking into account the radio refraction, the
major number of the radio sources can be successfully identified with the
optical objects.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:14:55 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lipovka",
"A.",
""
],
[
"Lipovka",
"N.",
""
]
] |
0704.3710 | Carlos Escudero | Carlos Escudero | Blow-up of the hyperbolic Burgers equation | null | Journal of Statistical Physics, Volume 127, Number 2 / April,
2007, 327-338 | 10.1007/s10955-006-9276-7 | null | math-ph math.AP math.MP physics.flu-dyn | null | The memory effects on microscopic kinetic systems have been sometimes
modelled by means of the introduction of second order time derivatives in the
macroscopic hydrodynamic equations. One prototypical example is the hyperbolic
modification of the Burgers equation, that has been introduced to clarify the
interplay of hyperbolicity and nonlinear hydrodynamic evolution. Previous
studies suggested the finite time blow-up of this equation, and here we present
a rigorous proof of this fact.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:15:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Escudero",
"Carlos",
""
]
] |
0704.3711 | Pere Ara | Pere Ara, Martin Mathieu | Maximal C*-algebras of quotients and injective envelopes of C*-algebras | 37 pages | null | null | null | math.OA math.RA | null | A new C*-enlargement of a C*-algebra $A$ nested between the local multiplier
algebra $M_{\text{loc}}(A)$ of $A$ and its injective envelope $I(A)$ is
introduced. Various aspects of this maximal C*-algebra of quotients,
$Q_{\text{max}}(A)$, are studied, notably in the setting of AW*-algebras. As a
by-product we obtain a new example of a type I C*-algebra $A$ such that
$M_{\text{loc}}(M_{\text{loc}}(A))\ne M_{\text{loc}}(A)$.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:16:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ara",
"Pere",
""
],
[
"Mathieu",
"Martin",
""
]
] |
0704.3712 | Yves Van Haarlem | Yves Van Haarlem, Anton Jgoun, Pasquale Di Nezza | Nuclear p_t broadening at HERMES | 4 pages, 5 figures, submitted to DIS 2007 proceedings | ECONFC0706044:10,2007 | 10.3360/dis.2007.208 | null | hep-ex | null | The first direct measurement of p_t-broadening effects in cold nuclear matter
has been studied as a function of several kinematic variables for different
hadron types. The data have been accumulated by the HERMES experiment at DESY,
in which the HERA 27.6 GeV lepton beam scattered off several nuclear gas
targets.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:43:21 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Apr 2007 11:48:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Van Haarlem",
"Yves",
""
],
[
"Jgoun",
"Anton",
""
],
[
"Di Nezza",
"Pasquale",
""
]
] |
0704.3713 | S. K. Choudhary | S. K. Choudhary, A. K. Gupta | Shear-strain-induced Spatially Varying Super-lattice Structures on
Graphite studied by STM | 14 pages, 6 figures | null | 10.1088/0953-8984/20/22/225008 | null | cond-mat.other | null | We report on the Scanning Tunneling Microscope (STM) observation of linear
fringes together with spatially varying super-lattice structures on (0001)
graphite (HOPG) surface. The structure, present in a region of a layer bounded
by two straight carbon fibers, varies from a hexagonal lattice of 6nm
periodicity to nearly a square lattice of 13nm periodicity. It then changes
into a one-dimensional (1-D) fringe-like pattern before relaxing into a
pattern-free region. We attribute this surface structure to a shear strain
giving rise to a spatially varying rotation of the affected graphite layer
relative to the bulk substrate. We propose a simple method to understand these
moire patterns by looking at the fixed and rotated lattices in the Fourier
transformed k-space. Using this approach we can reproduce the spatially varying
2-D lattice as well as the 1-D fringes by simulation. The 1-D fringes are found
to result from a particular spatial dependence of the rotation angle.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:22:27 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Jan 2008 11:39:19 GMT"
}
] | 2014-02-11T00:00:00 | [
[
"Choudhary",
"S. K.",
""
],
[
"Gupta",
"A. K.",
""
]
] |
0704.3714 | Salvatore Esposito | E. Di Grezia, S. Esposito and G. Salesi | Second discontinuity in the specific heat of two-phase superconductors | revtex, 4 pages, 1 figure | null | 10.1016/j.physc.2007.08.001 | null | cond-mat.supr-con | null | The recently proposed theoretical model of superconductors endowed with two
distinct superconducting phases and critical temperatures is further analyzed
by introducing two distinct order parameters, described by two scalar fields
which condensate at different temperatures. We find some deviations in basic
thermodynamical quantities with respect to the Ginzburg-Landau one-phase
superconductors. In particular, by contrast to the usual case where only one
jump in specific heat takes place at the normal-superconductor transition
temperature, we actually predict an additional discontinuity for C_V when
passing from a superconducting phase to the other one.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:22:39 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 05:21:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Di Grezia",
"E.",
""
],
[
"Esposito",
"S.",
""
],
[
"Salesi",
"G.",
""
]
] |
0704.3715 | Pablo Echenique | Pablo Echenique, J. L. Alonso | Efficient model chemistries for peptides. I. Split-valence Gaussian
basis sets and the heterolevel approximation in RHF and MP2 | 54 pages, 16 figures, LaTeX, AMSTeX, Submitted to J. Comp. Chem | J. Comp. Chem. (2008) 1408-1422 | 10.1002/jcc.20900 | null | q-bio.QM cond-mat.soft q-bio.BM | null | We present an exhaustive study of more than 250 ab initio potential energy
surfaces (PESs) of the model dipeptide HCO-L-Ala-NH2. The model chemistries
(MCs) used are constructed as homo- and heterolevels involving possibly
different RHF and MP2 calculations for the geometry and the energy. The basis
sets used belong to a sample of 39 selected representants from Pople's
split-valence families, ranging from the small 3-21G to the large
6-311++G(2df,2pd). The reference PES to which the rest are compared is the
MP2/6-311++G(2df,2pd) homolevel, which, as far as we are aware, is the more
accurate PES of a dipeptide in the literature. The aim of the study presented
is twofold: On the one hand, the evaluation of the influence of polarization
and diffuse functions in the basis set, distinguishing between those placed at
1st-row atoms and those placed at hydrogens, as well as the effect of different
contraction and valence splitting schemes. On the other hand, the investigation
of the heterolevel assumption, which is defined here to be that which states
that heterolevel MCs are more efficient than homolevel MCs. The heterolevel
approximation is very commonly used in the literature, but it is seldom
checked. As far as we know, the only tests for peptides or related systems,
have been performed using a small number of conformers, and this is the first
time that this potentially very economical approximation is tested in full
PESs. In order to achieve these goals, all data sets have been compared and
analyzed in a way which captures the nearness concept in the space of MCs.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:26:29 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jun 2007 08:36:49 GMT"
}
] | 2013-06-21T00:00:00 | [
[
"Echenique",
"Pablo",
""
],
[
"Alonso",
"J. L.",
""
]
] |
0704.3716 | Florentin Smarandache | Florentin Smarandache | Existence and Number of Solutions of Diophantine Quadratic Equations
with Two Unknowns in $Z$ and $N$ | 2 pages | Published in the book "Generalisations et Generalites" [French],
by F. Smarandache, Ed. Nouvelle, F\`es, Marocco, pp. 39-40, 1984 | null | null | math.GM | null | In this short note we study the existence and number of solutions in the set
of integers ($Z$) and in the set of natural numbers ($N$) of Diopahntine
Equations of second degree with two variables of the general form
$ax^2-by^2=c$.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:26:31 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Smarandache",
"Florentin",
""
]
] |
0704.3717 | Yuri Velichko | Yuri S. Velichko, Francisco J. Solis, Sharon M. Loverde, Monica Olvera
de la Cruz | Ion condensation on charged patterned surfaces | 3 figures | null | 10.1063/1.2888980 | null | cond-mat.stat-mech cond-mat.mtrl-sci | null | We study ion condensation onto a patterned surface of alternating charges.
The competition between self-energy and ion-surface interactions leads to the
formation of ionic crystalline structures at low temperatures. We consider
different arrangements of underlying ionic crystals, including single ion
adsorption, as well as the formation of dipoles at the interface between
charged domains. Molecular dynamic simulation illustrates existence of single
and mixed phases. Our results contribute to understanding pattern recognition,
and molecular separation and synthesis near patterned surfaces.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:42:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Velichko",
"Yuri S.",
""
],
[
"Solis",
"Francisco J.",
""
],
[
"Loverde",
"Sharon M.",
""
],
[
"de la Cruz",
"Monica Olvera",
""
]
] |
0704.3718 | Rhaana L. C. Starling | R. L. C. Starling (1,2), A. J. van der Horst (2), E. Rol (1), R. A. M.
J. Wijers (2), C. Kouveliotou (3), K. Wiersema (2), P. A. Curran (2) and P.
Weltevrede (2) ((1) Leicester, (2) Amsterdam, (3) NASA/MSFC) | Gamma-Ray Burst Afterglows as Probes of Environment and Blastwave
Physics II: the Distribution of p and Structure of the Circumburst Medium | 25 pages (single column), 2 figures, ApJ accepted after minor
revisions | null | 10.1086/521975 | null | astro-ph | null | We constrain blastwave parameters and the circumburst media of a subsample of
ten BeppoSAX Gamma-Ray Bursts. For this sample we derive the values of the
injected electron energy distribution index, p, and the density structure index
of the circumburst medium, k, from simultaneous spectral fits to their X-ray,
optical and nIR afterglow data. The spectral fits have been done in count space
and include the effects of metallicity, and are compared with the previously
reported optical and X-ray temporal behaviour. Using the blastwave model and
some assumptions which include on-axis viewing and standard jet structure,
constant blastwave energy and no evolution of the microphysical parameters, we
find a mean value of p for the sample as a whole of 2.04 +0.02/-0.03. A
statistical analysis of the distribution demonstrates that the p values in this
sample are inconsistent with a single universal value for p at the 3-sigma
level or greater, which has significant implications for particle acceleration
models. This approach provides us with a measured distribution of circumburst
density structures rather than considering only the cases of k=0 (homogeneous)
and k=2 (wind-like). We find five GRBs for which k can be well constrained, and
in four of these cases the circumburst medium is clearly wind-like. The fifth
source has a value of 0<k<1, consistent with a homogeneous circumburst medium.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:45:53 GMT"
},
{
"version": "v2",
"created": "Sat, 28 Jul 2007 17:18:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Starling",
"R. L. C.",
"",
"Leicester",
"Amsterdam"
],
[
"van der Horst",
"A. J.",
"",
"Amsterdam"
],
[
"Rol",
"E.",
"",
"Leicester"
],
[
"Wijers",
"R. A. M. J.",
"",
"Amsterdam"
],
[
"Kouveliotou",
"C.",
"",
"NASA/MSFC"
],
[
"Wiersema",
"K.",
"",
"Amsterdam"
],
[
"Curran",
"P. A.",
"",
"Amsterdam"
],
[
"Weltevrede",
"P.",
"",
"Amsterdam"
]
] |
0704.3719 | Matthew Headrick | Matthew Headrick and Tadashi Takayanagi | A holographic proof of the strong subadditivity of entanglement entropy | 9 pages, 3 figures | Phys.Rev.D76:106013,2007 | 10.1103/PhysRevD.76.106013 | SU-ITP-07/08, KUNS-2069 | hep-th cond-mat.stat-mech quant-ph | null | When a quantum system is divided into subsystems, their entanglement
entropies are subject to an inequality known as "strong subadditivity". For a
field theory this inequality can be stated as follows: given any two regions of
space $A$ and $B$, $S(A) + S(B) \ge S(A \cup B) + S(A \cap B)$. Recently, a
method has been found for computing entanglement entropies in any field theory
for which there is a holographically dual gravity theory. In this note we give
a simple geometrical proof of strong subadditivity employing this holographic
prescription.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 18:00:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Headrick",
"Matthew",
""
],
[
"Takayanagi",
"Tadashi",
""
]
] |
0704.3720 | Michael T. Lacey | Michael Lacey, Stefanie Petermichl, Jill Pipher and Brett Wick | Multiparameter Riesz Commutators | 38 Pages. References updated. To appear in American J Math | Amer. J. Math. 131 (2009), no. 3, 731-769 | 10.1353/ajm.0.0059 | null | math.CA | null | It is shown that product BMO of Chang and Fefferman, defined on the product
of Euclidean spaces can be characterized by the multiparameter commutators of
Riesz transforms. This extends a classical one-parameter result of Coifman,
Rochberg, and Weiss, and at the same time extends the work of Lacey and
Ferguson and Lacey and Terwilleger on multiparameter commutators with Hilbert
transforms. The method of proof requires the real-variable methods throughout,
which is new in the multi-parameter context.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 18:00:54 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Apr 2008 19:13:59 GMT"
}
] | 2010-05-10T00:00:00 | [
[
"Lacey",
"Michael",
""
],
[
"Petermichl",
"Stefanie",
""
],
[
"Pipher",
"Jill",
""
],
[
"Wick",
"Brett",
""
]
] |
0704.3721 | Douglas R. Bergman | Douglas R Bergman and John W. Belz | Cosmic Rays: The Second Knee and Beyond | 46 pages, 30 figures. Topical Review to appear in J. Physics G | J.Phys.G34:R359,2007 | 10.1088/0954-3899/34/10/R01 | null | astro-ph | null | We conduct a review of experimental results on Ultra-High Energy Cosmic Rays
(UHECR's) including measurements of the features of the spectrum, the
composition of the primary particle flux and the search for anisotropy in event
arrival direction. We find that while there is a general consensus on the
features in the spectrum -- the Second Knee, the Ankle, and (to a lesser
extent) the GZK Cutoff -- there is little consensus on the composition of the
primaries that accompany these features. This lack of consensus on the
composition makes interpretation of the agreed upon features problematic. There
is also little direct evidence about potential sources of UHECRs, as early
reports of arrival direction anisotropies have not been confirmed in
independent measurements.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 17:47:00 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bergman",
"Douglas R",
""
],
[
"Belz",
"John W.",
""
]
] |
0704.3722 | Ellyn Baines | E. K. Baines, G. T. van Belle, T. A. ten Brummelaar, H. A. McAlister,
M. Swain, N. H. Turner, L. Sturmann, J. Sturmann | Direct Measurement of the Radius and Density of the Transiting Exoplanet
HD 189733B with the CHARA Array | 14 pages, 5 figures, to be published in Astrophysical Journal Letters | null | 10.1086/519002 | null | astro-ph | null | We have measured the angular diameter of the transiting extrasolar planet
host star HD 189733 using the CHARA O/IR interferometric array. Combining our
new angular diameter of 0.377+/-0.024 mas with the Hipparcos parallax leads to
a linear radius for the host star of 0.779+/-0.052 Rsol and a radius for the
planet of 1.19+/-0.08 RJup. Adopting the mass of the planet as derived by its
discoverers, we derive a mean density of the planet of 0.91+/-0.18 g cm-3. This
is the first determination of the diameter of an extrasolar planet through
purely direct means.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 18:04:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Baines",
"E. K.",
""
],
[
"van Belle",
"G. T.",
""
],
[
"Brummelaar",
"T. A. ten",
""
],
[
"McAlister",
"H. A.",
""
],
[
"Swain",
"M.",
""
],
[
"Turner",
"N. H.",
""
],
[
"Sturmann",
"L.",
""
],
[
"Sturmann",
"J.",
""
]
] |
0704.3723 | Paul Slater | Paul B. Slater | Dyson Indices and Hilbert-Schmidt Separability Functions and
Probabilities | 44 pages, 6 figures, modified title, trimmed abstract, to appear in
J. Phys. A | J. Phys. A Math. Theor. 40 (2007),14279-14308 | 10.1088/1751-8113/40/47/017 | null | quant-ph | null | A confluence of numerical and theoretical results leads us to conjecture that
the Hilbert-Schmidt separability probabilities of the 15- and 9-dimensional
convex sets of complex and real two-qubit states (representable by 4 x 4
density matrices rho) are 8/33 and 8/17, respectively. Central to our reasoning
are the modifications of two ansatze, recently advanced (quant-ph/0609006),
involving incomplete beta functions B_{nu}(a,b), where nu= (rho_{11}
rho_{44})/(rho_{22} rho_{33}). We, now, set the separability function
S_{real}(nu) propto B_{nu}(nu,1/2},2) =(2/3) (3-nu) sqrt{nu}. Then, in the
complex case -- conforming to a pattern we find, manifesting the Dyson indices
(1, 2, 4) of random matrix theory-- we take S_{complex}(nu) propto S_{real}^{2}
(nu). We also investigate the real and complex qubit-qutrit cases. Now, there
are two Bloore ratio variables, nu_{1}= (rho_{11} rho_{55})(rho_{22} rho_{44}),
nu_{2}= (rho_{22} rho_{66})(rho_{33} rho_{55}), but they appear to remarkably
coalesce into the product, eta = nu_1 nu_2 = rho_{11} \rho_{66}}{\rho_{33}
\rho_{44}}, so that the real and complex separability functions are again
univariate in nature.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 18:09:21 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 19:22:05 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Sep 2007 22:27:30 GMT"
},
{
"version": "v4",
"created": "Thu, 11 Oct 2007 17:17:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Slater",
"Paul B.",
""
]
] |
0704.3724 | Paul Smolen | Paul Smolen | A Model of Late Long-Term Potentiation Simulates Aspects of Memory
Maintenance | Accepted to PLoS One. 8 figures at end | null | 10.1371/journal.pone.0000445 | null | q-bio.NC q-bio.MN | null | Late long-term potentiation (L-LTP) appears essential for the formation of
long-term memory, with memories at least partly encoded by patterns of
strengthened synapses. How memories are preserved for months or years, despite
molecular turnover, is not well understood. Ongoing recurrent neuronal
activity, during memory recall or during sleep, has been hypothesized to
preferentially potentiate strong synapses, preserving memories. This hypothesis
has not been evaluated in the context of a mathematical model representing
biochemical pathways important for L-LTP. I incorporated ongoing activity into
two such models: a reduced model that represents some of the essential
biochemical processes, and a more detailed published model. The reduced model
represents synaptic tagging and gene induction intuitively, and the detailed
model adds activation of essential kinases by Ca. Ongoing activity was modeled
as continual brief elevations of [Ca]. In each model, two stable states of
synaptic weight resulted. Positive feedback between synaptic weight and the
amplitude of ongoing Ca transients underlies this bistability. A tetanic or
theta-burst stimulus switches a model synapse from a low weight to a high
weight stabilized by ongoing activity. Bistability was robust to parameter
variations. Simulations illustrated that prolonged decreased activity reset
synapses to low weights, suggesting a plausible forgetting mechanism. However,
episodic activity with shorter inactive intervals maintained strong synapses.
Both models support experimental predictions. Tests of these predictions are
expected to further understanding of how neuronal activity is coupled to
maintenance of synaptic strength.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 18:39:12 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Smolen",
"Paul",
""
]
] |
0704.3725 | Olaf M\"uller | Helga Baum, Olaf M\"uller | Codazzi spinors and globally hyperbolic manifolds with special holonomy | 29 pages. to appear in: Mathematische Zeitschrift | null | null | null | math.DG | null | In this paper we examine the structure of Riemannian manifolds with a special
kind of Codazzi tensors. We use them to construct globally hyperbolic
Lorentzian manifolds with complete Cauchy hypersurfaces for any weakly
irreducible holonomy representation with parallel spinors, i.e. with a holonomy
group which is a semidirect product between $\R^{n-2}$ and one of $\1, SU(k),
Sp(1), G_2$ and $Spin(7)$.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 18:32:32 GMT"
}
] | 2016-05-20T00:00:00 | [
[
"Baum",
"Helga",
""
],
[
"Müller",
"Olaf",
""
]
] |
0704.3726 | Hans-Werner Hammer | H.-W. Hammer, D.R. Phillips, L. Platter | Pion-mass dependence of three-nucleon observables | 24 pages, 9 figures | Eur.Phys.J.A32:335-347,2007 | 10.1140/epja/i2007-10380-y | HISKP-TH-07-13 | nucl-th hep-lat hep-ph | null | We use an effective field theory (EFT) which contains only short-range
interactions to study the dependence of a variety of three-nucleon observables
on the pion mass. The pion-mass dependence of input quantities in our
``pionless'' EFT is obtained from a recent chiral EFT calculation. To the order
we work at, these quantities are the 1S0 scattering length and effective range,
the deuteron binding energy, the 3S1 effective range, and the binding energy of
one three-nucleon bound state. The chiral EFT input we use has the inverse 3S1
and 1S0 scattering lengths vanishing at mpi_c=197.8577 MeV. At this
``critical'' pion mass, the triton has infinitely many excited states with an
accumulation point at the three-nucleon threshold. We compute the binding
energies of these states up to next-to-next-to-leading order in the pionless
EFT and study the convergence pattern of the EFT in the vicinity of the
critical pion mass. Furthermore, we use the pionless EFT to predict how doublet
and quartet nd scattering lengths depend on mpi in the region between the
physical pion mass and mpi=mpi_c.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 18:47:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hammer",
"H. -W.",
""
],
[
"Phillips",
"D. R.",
""
],
[
"Platter",
"L.",
""
]
] |
0704.3727 | Marton Elekes | M\'arton Elekes, Tam\'as Keleti and Andr\'as M\'ath\'e | Self-similar and self-affine sets; measure of the intersection of two
copies | null | null | null | null | math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let K be a self-similar or self-affine set in R^d, let \mu be a self-similar
or self-affine measure on it, and let G be the group of affine maps,
similitudes, isometries or translations of R^d. Under various assumptions (such
as separation conditions or we assume that the transformations are small
perturbations or that K is a so called Sierpinski sponge) we prove theorems of
the following types, which are closely related to each other;
Non-stability: There exists a constant c<1 such that for every g\in G we have
either \mu(K\cap g(K)) <c \mu(K) or K\subset g(K).
Measure and topology: For every g\in G we have \mu(K\cap g(K)) > 0 \iff int_K
(K\cap g(K)) is nonempty (where int_K is interior relative to K).
Extension: The measure \mu has a G-invariant extension to R^d.
Moreover, in many situations we characterize those g's for which \mu(K\cap
g(K) > 0, and we also get results about those $g$'s for which $g(K)\su K$ or
$g(K)\supset K$ holds.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:07:03 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Jul 2008 16:31:09 GMT"
}
] | 2008-07-14T00:00:00 | [
[
"Elekes",
"Márton",
""
],
[
"Keleti",
"Tamás",
""
],
[
"Máthé",
"András",
""
]
] |
0704.3728 | G P Procopio | Alessandro Fabbri, Giovanni Paolo Procopio | Quantum Effects in Black Holes from the Schwarzschild Black String? | 15 pages, 2 figures, expanded version, including a discussion on the
GL instability; to appear in Class. Quant. Grav | Class.Quant.Grav.24:5371-5382,2007 | 10.1088/0264-9381/24/22/003 | DAMTP-2007-27 | hep-th gr-qc | null | The holographic conjecture for black holes localized on a 3-brane in
Randall-Sundrum braneworld models RS2 predicts the existence of a classical 5D
time dependent solution dual to a 4D evaporating black hole. After briefly
reviewing recent criticism and presenting some difficulties in the holographic
interpretation of the Gregory-Laflamme instability, we simulate some basic
features of such a solution by studying null geodesics of the Schwarzschild
black string, in particular those propagating nontrivially in the bulk, and
using holographic arguments.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:34:53 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 22:33:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Fabbri",
"Alessandro",
""
],
[
"Procopio",
"Giovanni Paolo",
""
]
] |
0704.3729 | Francois Lefloch | Elsa Lhotel (LATEQS), Olivier Coupiac (LATEQS), Fran\c{c}ois Lefloch
(LATEQS), Herv\'e Courtois (NEEL), Marc Sanquer (LATEQS) | Divergence at low bias and down-mixing of the current noise in a
diffusive superconductor-normal metal-superconductor junction | null | null | 10.1103/PhysRevLett.99.117002 | null | cond-mat.mes-hall | null | We present current noise measurements in a long diffusive
superconductor-normal-metal-superconductor junction in the low voltage regime,
in which transport can be partially described in terms of coherent multiple
Andreev reflections. We show that, when decreasing voltage, the current noise
exhibits a strong divergence together with a broad peak. We ascribe this peak
to the mixing between the ac- Josephson current and the noise of the junction
itself. We show that the junction noise corresponds to the thermal noise of a
nonlinear resistor 4kBT=R with R V = I V and no adjustable parameters.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:07:56 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Oct 2007 14:18:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lhotel",
"Elsa",
"",
"LATEQS"
],
[
"Coupiac",
"Olivier",
"",
"LATEQS"
],
[
"Lefloch",
"François",
"",
"LATEQS"
],
[
"Courtois",
"Hervé",
"",
"NEEL"
],
[
"Sanquer",
"Marc",
"",
"LATEQS"
]
] |
0704.3730 | Volkan Sevim | Volkan Sevim, Per Arne Rikvold | Network Growth with Preferential Attachment for High Indegree and Low
Outdegree | null | Physica A, Volume 387, Issue 11, 2631-2636 (2008) | 10.1016/j.physa.2008.01.034 | null | cond-mat.stat-mech q-bio.PE | null | We study the growth of a directed transportation network, such as a food web,
in which links carry resources. We propose a growth process in which new nodes
(or species) preferentially attach to existing nodes with high indegree (in
food-web language, number of prey) and low outdegree (or number of predators).
This scheme, which we call inverse preferential attachment, is intended to
maximize the amount of resources available to each new node. We show that the
outdegree (predator) distribution decays at least exponentially fast for large
outdegree and is continuously tunable between an exponential distribution and a
delta function. The indegree (prey) distribution is poissonian in the
large-network limit.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:17:20 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 18:49:15 GMT"
}
] | 2008-03-17T00:00:00 | [
[
"Sevim",
"Volkan",
""
],
[
"Rikvold",
"Per Arne",
""
]
] |
0704.3731 | Olivier Bernardi | Olivier Bernardi (CRM), Nicolas Bonichon (LaBRI) | Catalan's intervals and realizers of triangulations | 22 pages | Journal of Combinatorial Theory Series A 116, 1 (2009) 55-75 | null | null | math.CO | null | The Stanley lattice, Tamari lattice and Kreweras lattice are three remarkable
orders defined on the set of Catalan objects of a given size. These lattices
are ordered by inclusion: the Stanley lattice is an extension of the Tamari
lattice which is an extension of the Kreweras lattice. The Stanley order can be
defined on the set of Dyck paths of size $n$ as the relation of \emph{being
above}. Hence, intervals in the Stanley lattice are pairs of non-crossing Dyck
paths. In a former article, the second author defined a bijection $\Phi$
between pairs of non-crossing Dyck paths and the realizers of triangulations
(or Schnyder woods). We give a simpler description of the bijection $\Phi$.
Then, we study the restriction of $\Phi$ to Tamari's and Kreweras' intervals.
We prove that $\Phi$ induces a bijection between Tamari intervals and minimal
realizers. This gives a bijection between Tamari intervals and triangulations.
We also prove that $\Phi$ induces a bijection between Kreweras intervals and
the (unique) realizers of stack triangulations. Thus, $\Phi$ induces a
bijection between Kreweras intervals and stack triangulations which are known
to be in bijection with ternary trees.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:12:53 GMT"
}
] | 2009-06-18T00:00:00 | [
[
"Bernardi",
"Olivier",
"",
"CRM"
],
[
"Bonichon",
"Nicolas",
"",
"LaBRI"
]
] |
0704.3732 | Laurent Cognet | St\'ephane Berciaud (CPMOH), Laurent Cognet (CPMOH), Philippe Poulin
(CRPP), R. Bruce Weisman, Brahim Lounis (CPMOH) | Absorption spectroscopy of individual single-walled carbon nanotubes | null | Nano Letters 7, 5 (09/05/2007) 1203-1207 | 10.1021/nl062933k | null | physics.optics | null | Current methods for producing single-walled carbon nanotubes (SWNTs) lead to
heterogeneous samples containing mixtures of metallic and semiconducting
species with a variety of lengths and defects. Optical detection at the single
nanotube level should thus offer the possibility to examine these
heterogeneities provided that both SWNT species are equally well detected.
Here, we used photothermal heterodyne detection to record absorption images and
spectra of individual SWNTs. Because this photothermal method relies only on
light absorption, it readily detects metallic nanotubes as well as the emissive
semiconducting species. The first and second optical transitions in individual
semicontucting nanotubes have been probed. Comparison between the emission and
absorption spectra of the lowest-lying optical transition reveal mainly small
Stokes shifts. Side bands in the near-infrared absorption spectra are observed
and assigned to exciton-phonon bound states. No such sidebands are detected
around the lowest transition of metallic nanotubes.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:14:38 GMT"
},
{
"version": "v2",
"created": "Sat, 28 Apr 2007 19:52:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Berciaud",
"Stéphane",
"",
"CPMOH"
],
[
"Cognet",
"Laurent",
"",
"CPMOH"
],
[
"Poulin",
"Philippe",
"",
"CRPP"
],
[
"Weisman",
"R. Bruce",
"",
"CPMOH"
],
[
"Lounis",
"Brahim",
"",
"CPMOH"
]
] |
0704.3733 | Alexander Konovalov | V.A. Bovdi, A.B. Konovalov and S. Linton | Torsion units in integral group ring of the Mathieu simple group M22 | 12 pages (8 pages + appendix), updated references | null | null | null | math.RA math.GR | null | We investigate the possible character values of torsion units of the
normalized unit group of the integral group ring of Mathieu sporadic group
$M_{22}$. We confirm the Kimmerle conjecture on prime graphs for this group and
specify the partial augmentations for possible counterexamples to the stronger
Zassenhaus conjecture.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:15:34 GMT"
},
{
"version": "v2",
"created": "Tue, 15 May 2007 19:32:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bovdi",
"V. A.",
""
],
[
"Konovalov",
"A. B.",
""
],
[
"Linton",
"S.",
""
]
] |
0704.3734 | Roman Lopez-Sandoval | M. Reyes-Reyes, R. Lopez-Sandoval, J. Arenas-Alatorre, R.
Garibay-Alonso, D. L. Carroll and A. Lastras-Martinez | Methanofullerene Elongated Nanostructure Formation for Enhanced Organic
Solar Cells | 14 pages, 3 Figures, In Press Thin Solid Films | null | null | null | cond-mat.mtrl-sci | null | Using transmission electron microscopy (TEM) and Z-contrast imaging we have
demonstrated elongated nanostructure formation of fullerene derivative
[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) within an organic host
through annealing. The annealing provides an enhanced mobility of the PCBM
molecules and, with good initial dispersion, allows for the formation of
exaggerated grain growth within the polymer host. We have assembled these
nanostructures within the regioregular conjugated polymer
poly(3-hexylthiophene) (P3HT). This PCBM elongated nanostructure formation
maybe responsible for the very high efficiencies observed, at very low loadings
of PCBM (1:0.6, polymer to PCBM), in annealed photovoltaics. Moreover, our high
resolution TEM and electron energy loss spectroscopy studies clearly show that
the PCBM crystals remain crystalline and are unaffected by the 200-keV electron
beam
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:28:57 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Reyes-Reyes",
"M.",
""
],
[
"Lopez-Sandoval",
"R.",
""
],
[
"Arenas-Alatorre",
"J.",
""
],
[
"Garibay-Alonso",
"R.",
""
],
[
"Carroll",
"D. L.",
""
],
[
"Lastras-Martinez",
"A.",
""
]
] |
0704.3735 | Amol Dighe | Amol Dighe (Tata Inst.), Srubabati Goswami (Harish-Chandra Res.
Inst.), Probir Roy (Tata Inst.) | Radiatively broken symmetries of nonhierarchical neutrinos | 29 pages, 4 figures, revtex4. Minor changes in the Introduction,
references added. Final version to be published in Phys. Rev. D | Phys.Rev.D76:096005,2007 | 10.1103/PhysRevD.76.096005 | TIFR/TH/07-07 | hep-ph | null | Symmetry-based ideas, such as the quark-lepton complementarity (QLC)
principle and the tri-bimaximal mixing (TBM) scheme, have been proposed to
explain the observed mixing pattern of neutrinos. We argue that such symmetry
relations need to be imposed at a high scale $\Lambda \sim 10^{12}$ GeV
characterizing the large masses of right-handed neutrinos required to implement
the seesaw mechanism. For nonhierarchical neutrinos, renormalisation group
evolution down to a laboratory energy scale $\lambda \sim 10^3$ GeV tends to
radiatively break these symmetries at a significant level and spoil the mixing
pattern predicted by them. However, for Majorana neutrinos, suitable
constraints on the extra phases $\alpha_{2,3}$ enable the retention of those
high scale mixing patterns at laboratory energies. We examine this issue within
the Minimal Supersymmetric Standard Model (MSSM) and demonstrate the fact
posited above for two versions of QLC and two versions of TBM. The appropriate
constraints are worked out for all these four cases. Specifically, a preference
for $\alpha_2 \approx \pi$ (i.e. $m_1 \approx -m_2$) emerges in each case. We
also show how a future accurate measurement of $\theta_{13}$ may enable some
discrimination among these four cases in spite of renormalization group
evolution.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:32:59 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Sep 2007 08:41:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dighe",
"Amol",
"",
"Tata Inst."
],
[
"Goswami",
"Srubabati",
"",
"Harish-Chandra Res.\n Inst."
],
[
"Roy",
"Probir",
"",
"Tata Inst."
]
] |
0704.3736 | Patricio Vielva | P. Vielva, Y. Wiaux, E. Martinez-Gonzalez, P. Vandergheynst | Alignment and signed-intensity anomalies in WMAP data | 12 pages, 7 figures. Accepted for publication in MNRAS. Small changes
made (including the new subsection 3.4) to match the final version | Mon. Not. R. Astron. Soc. 381(2007) 932 | 10.1111/j.1365-2966.2007.12290.x | null | astro-ph | null | Significant alignment and signed-intensity anomalies of local features of the
cosmic microwave background (CMB) are detected on the three-year WMAP data,
through a decomposition of the signal with steerable wavelets on the sphere.
Firstly, an alignment analysis identifies two mean preferred planes in the sky,
both with normal axes close to the CMB dipole axis. The first plane is defined
by the directions toward which local CMB features are anomalously aligned. A
mean preferred axis is also identified in this plane, located very close to the
ecliptic poles axis. The second plane is defined by the directions anomalously
avoided by local CMB features. This alignment anomaly provides further insight
on recent results (Wiaux et al. 2006). Secondly, a signed-intensity analysis
identifies three mean preferred directions in the southern galactic hemisphere
with anomalously high or low temperature of local CMB features: a cold spot
essentially identified with a known cold spot (Vielva et al. 2004), a second
cold spot lying very close to the southern end of the CMB dipole axis, and a
hot spot lying close to the southern end of the ecliptic poles axis. In both
analyses, the anomalies are observed at wavelet scales corresponding to angular
sizes around 10 degress on the celestial sphere, with global significance
levels around 1%. Further investigation reveals that the alignment and
signed-intensity anomalies are only very partially related. Instrumental noise,
foreground emissions, as well as some form of other systematics, are strongly
rejected as possible origins of the detections. An explanation might still be
envisaged in terms of a global violation of the isotropy of the Universe,
inducing an intrinsic statistical anisotropy of the CMB.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:35:32 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Jul 2007 10:41:18 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Vielva",
"P.",
""
],
[
"Wiaux",
"Y.",
""
],
[
"Martinez-Gonzalez",
"E.",
""
],
[
"Vandergheynst",
"P.",
""
]
] |
0704.3737 | Helge Glockner | Helge Glockner | Contractible Lie groups over local fields | 24 pages, LaTeX | null | null | null | math.GR math.DS | null | Let G be a Lie group over a local field of positive characteristic which
admits a contractive automorphism f (i.e., the forward iterates f^n(x) of each
group element x converge to the neutral element 1). We show that then G is a
torsion group of finite exponent and nilpotent. We also obtain results
concerning the interplay between contractive automorphisms of Lie groups over
local fields, contractive automorphisms of their Lie algebras, and positive
gradations thereon. Some of the results even extend to Lie groups over
arbitrary complete ultrametric fields.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 19:52:01 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Glockner",
"Helge",
""
]
] |
0704.3738 | Kirill Glavatskiy | K. S. Glavatskiy, D. Bedeaux | The square gradient model in a two-phase mixture I. \\Equilibrium
properties | 14 pages, 3 figures | null | null | null | cond-mat.soft | null | In order to describe a nonuniform equilibrium mixture with an interface
between two coexisting phases it is necessary to consider contributions to the
Helmholtz energy which depend on the gradients of for instance the density. Van
der Waals \cite{vdW/sg, vdW/translation} was the first to introduce such a
term, which is very important in the interfacial region for a one-component
system. Cahn & Hilliard \cite{cahnhilliard/fens/I} extended this analysis to a
binary mixture by introducing gradient terms of the mol fraction. We give an
systematic extension of the gradient theory to three-dimensional
multi-component systems.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 16:14:35 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Nov 2007 15:09:31 GMT"
}
] | 2007-11-07T00:00:00 | [
[
"Glavatskiy",
"K. S.",
""
],
[
"Bedeaux",
"D.",
""
]
] |
0704.3739 | Nicholas Ross Mr. | Nicholas P. Ross, T. Shanks, Russell D. Cannon, D.A. Wake, R.G. Sharp,
S.M. Croom, John A. Peacock | Luminous Red Galaxy Clustering at z~0.7 - First Results using AAOmega | 12 pages, 7 figures, 8 tables, minor changes, matches published
version | Mon.Not.Roy.Astron.Soc.387:1323-1334,2008 | 10.1111/j.1365-2966.2008.13332.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the AAT-AAOmega LRG Pilot observing run to establish the
feasibility of a large spectroscopic survey using the new AAOmega instrument.
We have selected Luminous Red Galaxies (LRGs) using single epoch SDSS
riz-photometry to i<20.5 and z<20.2. We have observed in 3 fields including the
COSMOS field and the COMBO-17 S11 field, obtaining a sample of ~600 redshift
z>=0.5 LRGs. Exposure times varied from 1 - 4 hours to determine the minimum
exposure for AAOmega to make an essentially complete LRG redshift survey in
average conditions. We show that LRG redshifts to i<20.5 can measured in
approximately 1.5hr exposures and present comparisons with 2SLAQ and COMBO-17
(photo-)redshifts. Crucially, the riz selection coupled with the 3-4 times
improved AAOmega throughput is shown to extend the LRG mean redshift from
z=0.55 for 2SLAQ to z=0.681+/- 0.005 for riz-selected LRGs. This extended range
is vital for maximising the S/N for the detection of the baryon acoustic
oscillations (BAOs). Furthermore, we show that the amplitude of LRG clustering
is s_0 = 9.9+/-0.7 h^-1 Mpc, as high as that seen in the 2SLAQ LRG Survey.
Consistent results for the real-space amplitude are found from projected and
semi-projected correlation functions. This high clustering amplitude is
consistent with a long-lived population whose bias evolves as predicted by a
simple ``high-peaks'' model. We conclude that a redshift survey of 360 000 LRGs
over 3000deg^2, with an effective volume some 4 times bigger than previously
used to detect BAO with LRGs, is possible with AAOmega in 170 nights.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 20:00:12 GMT"
},
{
"version": "v2",
"created": "Fri, 19 Oct 2007 23:06:47 GMT"
},
{
"version": "v3",
"created": "Sat, 9 Aug 2008 16:21:03 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Ross",
"Nicholas P.",
""
],
[
"Shanks",
"T.",
""
],
[
"Cannon",
"Russell D.",
""
],
[
"Wake",
"D. A.",
""
],
[
"Sharp",
"R. G.",
""
],
[
"Croom",
"S. M.",
""
],
[
"Peacock",
"John A.",
""
]
] |
0704.3740 | Xi Yin | Davide Gaiotto, Xi Yin | Notes on Superconformal Chern-Simons-Matter Theories | 47 pages, 20 figures | JHEP 0708:056,2007 | 10.1088/1126-6708/2007/08/056 | null | hep-th | null | The three dimensional N=2 supersymmetric Chern-Simons theory coupled to
matter fields, possibly deformed by a superpotential, give rise to a large
class of exactly conformal theories with Lagrangian descriptions. These
theories can be arbitrarily weakly coupled, and hence can be studied
perturbatively. We study the theories in the large N limit, and compute the
two-loop anomalous dimension of certain long operators. Our result suggests
that various N=2 U(N) Chern-Simons theories coupled to suitable matter fields
are dual to open or closed string theories in AdS4, which are not yet
constructed.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 20:07:54 GMT"
}
] | 2011-05-05T00:00:00 | [
[
"Gaiotto",
"Davide",
""
],
[
"Yin",
"Xi",
""
]
] |
0704.3741 | Carlos Silva | Clement Daniel, Francois Makereel, Laura M. Herz, Freek J. M. Hoeben,
Pascal Jonkheijm, Albertus P. H. J. Schenning, E. W. Meijer, Carlos Silva | Mesoscopic order and the dimentionality of long-range resonance energy
transfer in supramolecular semiconductors | 17 Pages, 5 Figures, Submitted to J. Chem. Phys | J. Chem. Phys. 129, 104701 (2008) | 10.1063/1.2969077 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present time-resolved photoluminescence measurements on two series of
oligo-p-phenylenevinylene materials that self-assemble into supramolecular
nanostructures with thermotropic reversibility in dodecane. One set of
derivatives form chiral, helical stacks while the second set form less
organised, frustrated stacks. Here we study the effects of supramolecular
organisation on the resonance energy transfer rates. We measure these rates in
nanoassemblies formed with mixed blends of oligomers and compare them with the
rates predicted by Foerster theory. Our results and analysis show that control
of supramolecular order in the nanometre lengthscale has a dominant effect on
the efficiency and dimentionality of resonance energy transfer.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 20:02:03 GMT"
},
{
"version": "v2",
"created": "Mon, 16 Jun 2008 19:25:26 GMT"
}
] | 2013-09-27T00:00:00 | [
[
"Daniel",
"Clement",
""
],
[
"Makereel",
"Francois",
""
],
[
"Herz",
"Laura M.",
""
],
[
"Hoeben",
"Freek J. M.",
""
],
[
"Jonkheijm",
"Pascal",
""
],
[
"Schenning",
"Albertus P. H. J.",
""
],
[
"Meijer",
"E. W.",
""
],
[
"Silva",
"Carlos",
""
]
] |
0704.3742 | Eugene R. Speer | B. Derrida, J. L. Lebowitz, and E. R. Speer | Entropy of Open Lattice Systems | Latex, 28 pages, 4 figures as eps files | J. Stat. Phys. 126, 1083-1108 (2007) | 10.1007/s10955-006-9160-5 | null | cond-mat.stat-mech | null | We investigate the behavior of the Gibbs-Shannon entropy of the stationary
nonequilibrium measure describing a one-dimensional lattice gas, of L sites,
with symmetric exclusion dynamics and in contact with particle reservoirs at
different densities. In the hydrodynamic scaling limit, L to infinity, the
leading order (O(L)) behavior of this entropy has been shown by Bahadoran to be
that of a product measure corresponding to strict local equilibrium; we compute
the first correction, which is O(1). The computation uses a formal expansion of
the entropy in terms of truncated correlation functions; for this system the
k-th such correlation is shown to be O(L^{-k+1}). This entropy correction
depends only on the scaled truncated pair correlation, which describes the
covariance of the density field. It coincides, in the large L limit, with the
corresponding correction obtained from a Gaussian measure with the same
covariance.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 20:11:08 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Derrida",
"B.",
""
],
[
"Lebowitz",
"J. L.",
""
],
[
"Speer",
"E. R.",
""
]
] |
0704.3743 | Alex Markowitz | A. Markowitz (1,2), T. Takahashi (3), S. Watanabe (3), K. Nakazawa
(3), Y. Fukazawa (4), M. Kokubun (5), K. Makishima (5,6), H. Awaki (7), A.
Bamba (6), N. Isobe (6), J. Kataoka (8), G. Madejski (9,10), R. Mushotzky
(1), T. Okajima (1), A. Ptak (11), J. N. Reeves (1,11), Y. Ueda (12), T.
Yamasaki (4), T. Yaqoob (11) ((1) NASA/GSFC, (2) NASA Post-doc Research
Associate, (3) JAXA/IASA, (4) Hiroshima Univ., (5) Univ. of Tokyo, (6) RIKEN,
(7) Ehime Univ., (8) Tokyo Institute of Technology, (9) SLAC, (10)
Stanford/KIPAC, (11) Johns Hopkins Univ., (12) Kyoto Univ.) | The Suzaku Observation of the Nucleus of the Radio-Loud Active Galaxy
Centaurus A: Constraints on Abundances of the Accreting Material | Accepted for publication to ApJ. 22 pages, 11 figures (3 color). Uses
emulateapj5.sty. Grammatical errors corrected; some references updated | Astrophys.J.665:209-224,2007 | 10.1086/519271 | null | astro-ph | null | A Suzaku observation of the nucleus of the radio-loud AGN Centaurus A in 2005
has yielded a broadband spectrum spanning 0.3 to 250 keV. The net exposure
times after screening were: 70 ks per X-ray Imaging Spectrometer (XIS) camera,
60.8 ks for the Hard X-ray Detector (HXD) PIN, and 17.1 ks for the HXD-GSO. The
hard X-rays are fit by two power-laws of the same slope, absorbed by columns of
1.5 and 7 * 10^{23} cm^{-2} respectively. The spectrum is consistent with
previous suggestions that the power-law components are X-ray emission from the
sub-pc VLBI jet and from Bondi accretion at the core, but it is also consistent
with a partial covering interpretation. The soft band is dominated by thermal
emission from the diffuse plasma and is fit well by a two-temperature VAPEC
model, plus a third power-law component to account for scattered nuclear
emission, jet emission, and emission from X-ray Binaries and other point
sources. Narrow fluorescent emission lines from Fe, Si, S, Ar, Ca and Ni are
detected. The Fe K alpha line width yields a 200 light-day lower limit on the
distance from the black hole to the line-emitting gas. Fe, Ca, and S K-shell
absorption edges are detected. Elemental abundances are constrained via
absorption edge depths and strengths of the fluorescent and diffuse plasma
emission lines. The high metallicity ([Fe/H]=+0.1) of the circumnuclear
material suggests that it could not have originated in the relatively
metal-poor outer halo unless enrichment by local star formation has occurred.
Relative abundances are consistent with enrichment from Type II and Ia
supernovae.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 20:13:46 GMT"
},
{
"version": "v2",
"created": "Mon, 2 Jul 2007 21:05:24 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Markowitz",
"A.",
""
],
[
"Takahashi",
"T.",
""
],
[
"Watanabe",
"S.",
""
],
[
"Nakazawa",
"K.",
""
],
[
"Fukazawa",
"Y.",
""
],
[
"Kokubun",
"M.",
""
],
[
"Makishima",
"K.",
""
],
[
"Awaki",
"H.",
""
],
[
"Bamba",
"A.",
""
],
[
"Isobe",
"N.",
""
],
[
"Kataoka",
"J.",
""
],
[
"Madejski",
"G.",
""
],
[
"Mushotzky",
"R.",
""
],
[
"Okajima",
"T.",
""
],
[
"Ptak",
"A.",
""
],
[
"Reeves",
"J. N.",
""
],
[
"Ueda",
"Y.",
""
],
[
"Yamasaki",
"T.",
""
],
[
"Yaqoob",
"T.",
""
]
] |
0704.3744 | Kerry Soileau | Kerry M. Soileau | The General Form Of Cyclic Orthonormal Generators In R^N | null | null | null | null | math.GM | null | In this paper we give a definition of cyclic orthonormal generators (cogs) in
R^N. We give a general canonical form for their expression. Further, we give an
explicit formula for computing the canonical form of any given cog.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 20:18:12 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Soileau",
"Kerry M.",
""
]
] |
0704.3745 | Martin van Hecke | Ken Sakaie, Denis Fenistein, Timothy J. Carroll, Martin van Hecke,
Paul Umbanhowar | MR Imaging of Reynolds Dilatancy in the Bulk of Smooth Granular Flows | 4 pages, 3 figs, submitted to PRE | null | 10.1209/0295-5075/84/38001 | null | cond-mat.soft cond-mat.mtrl-sci | null | Dense granular matter has to expand in order to flow, a phenomenon known as
dilatancy. Here we perform, by means of Magnetic Resonance Imaging, direct
measurements of the evolution of the local packing density of a slow and smooth
granular shear flow generated in a split-bottomed geometry. The dilatancy is
found to be surprisingly strong. The dilated zone follow the region of large
strain rate and slowly spreads as a function of time. This suggests that the
local packing density is governed by the total amount of local strain
experienced since the start of the experiment.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 20:47:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sakaie",
"Ken",
""
],
[
"Fenistein",
"Denis",
""
],
[
"Carroll",
"Timothy J.",
""
],
[
"van Hecke",
"Martin",
""
],
[
"Umbanhowar",
"Paul",
""
]
] |
0704.3746 | Yufang Xi | Yufang Xi, Edmund M. Yeh | Distributed Algorithms for Spectrum Allocation, Power Control, Routing,
and Congestion Control in Wireless Networks | 14 pages, 5 figures, submitted to IEEE/ACM Transactions on Networking | null | 10.1145/1288107.1288132 | null | cs.NI | null | We develop distributed algorithms to allocate resources in multi-hop wireless
networks with the aim of minimizing total cost. In order to observe the
fundamental duplexing constraint that co-located transmitters and receivers
cannot operate simultaneously on the same frequency band, we first devise a
spectrum allocation scheme that divides the whole spectrum into multiple
sub-bands and activates conflict-free links on each sub-band. We show that the
minimum number of required sub-bands grows asymptotically at a logarithmic rate
with the chromatic number of network connectivity graph. A simple distributed
and asynchronous algorithm is developed to feasibly activate links on the
available sub-bands. Given a feasible spectrum allocation, we then design
node-based distributed algorithms for optimally controlling the transmission
powers on active links for each sub-band, jointly with traffic routes and user
input rates in response to channel states and traffic demands. We show that
under specified conditions, the algorithms asymptotically converge to the
optimal operating point.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 20:43:30 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Xi",
"Yufang",
""
],
[
"Yeh",
"Edmund M.",
""
]
] |
0704.3747 | Shinji Ejiri | Shinji Ejiri | Lattice QCD thermodynamics with Wilson quarks | Talk at Yukawa International Seminar 2006 (Kyoto), 8 pages, 8 figures | Prog.Theor.Phys.Suppl.168:245-252,2007 | 10.1143/PTPS.168.245 | BNL-NT-07/19 | hep-lat | null | We review studies of QCD thermodynamics by lattice QCD simulations with
dynamical Wilson quarks. After explaining the basic properties of QCD with
Wilson quarks at finite temperature including the phase structure and the
scaling properties around the chiral phase transition, we discuss the critical
temperature, the equation of state and heavy-quark free energies.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 20:51:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ejiri",
"Shinji",
""
]
] |
0704.3748 | Gerald A. Miller | Gerald A. Miller, Yi Y. Shi, Hong Qian, and Karol Bomsztyk | Clustering Coefficients of Protein-Protein Interaction Networks | 16 pages, 3 figures, in Press PRE uses pdflatex | Phys. Rev. E 75, 051910 (2007) | 10.1103/PhysRevE.75.051910 | null | q-bio.QM cond-mat.stat-mech physics.bio-ph q-bio.MN | null | The properties of certain networks are determined by hidden variables that
are not explicitly measured. The conditional probability (propagator) that a
vertex with a given value of the hidden variable is connected to k of other
vertices determines all measurable properties. We study hidden variable models
and find an averaging approximation that enables us to obtain a general
analytical result for the propagator. Analytic results showing the validity of
the approximation are obtained. We apply hidden variable models to
protein-protein interaction networks (PINs) in which the hidden variable is the
association free-energy, determined by distributions that depend on
biochemistry and evolution. We compute degree distributions as well as
clustering coefficients of several PINs of different species; good agreement
with measured data is obtained. For the human interactome two different
parameter sets give the same degree distributions, but the computed clustering
coefficients differ by a factor of about two. This shows that degree
distributions are not sufficient to determine the properties of PINs.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 21:00:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Miller",
"Gerald A.",
""
],
[
"Shi",
"Yi Y.",
""
],
[
"Qian",
"Hong",
""
],
[
"Bomsztyk",
"Karol",
""
]
] |
0704.3749 | Cornelia Drutu | Indira Chatterji, Cornelia Drutu, Frederic Haglund | Kazhdan and Haagerup properties from the median viewpoint | final version | null | null | null | math.GR math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the existence of a close connection between spaces with measured
walls and median metric spaces. We then relate properties (T) and Haagerup
(a-T-menability) to actions on median spaces and on spaces with measured walls.
This allows us to explore the relationship between the classical properties (T)
and Haagerup and their versions using affine isometric actions on $L^p$-spaces.
It also allows us to answer an open problem on a dynamical characterization of
property (T), generalizing results of Robertson-Steger.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 16:55:56 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Oct 2007 12:33:16 GMT"
},
{
"version": "v3",
"created": "Thu, 31 Jan 2008 18:10:18 GMT"
},
{
"version": "v4",
"created": "Fri, 23 Jan 2009 21:27:44 GMT"
}
] | 2009-01-23T00:00:00 | [
[
"Chatterji",
"Indira",
""
],
[
"Drutu",
"Cornelia",
""
],
[
"Haglund",
"Frederic",
""
]
] |
0704.3750 | Yefim Levin Semenovitch | Yefim S. Levin | Thermal Effects of Rotation in Random Classical Zero-Point Radiation | MikTex, 23 pages | null | null | null | math-ph math.MP | null | The rotating reference system, two-point correlation functions, and energy
density are used as the basis for investigating thermal effects observed by a
detector rotating through random classical zero-point radiation. The RS
consists of Frenet -Serret orthogonal tetrads where the rotating detector is at
rest and has a constant acceleration vector. The CFs and the energy density at
the rotating reference system should be periodic with rotation period because
CF and energy density measurements is one of the tools the detector can use to
justify the periodicity of its motion. The CFs have been calculated for both
electromagnetic and massless scalar fields in two cases, with and without
taking this periodicity into consideration. It turned out that only periodic
CFs have some thermal features and particularly the Planck's factor with the
temperature T= h w /k . Regarding to the energy density of both electromagnetic
and massless scalar field it is shown that the detector rotating in the
zero-point radiation observes not only this original zero-point radiation but,
above that, also the radiation which would have been observed by an inertial
detector in the thermal bath with the Plank's spectrum at the temperature T.
This effect is masked by factor 2/3(4 gamma^2-1) for the electromagnetic field
and 2/9 (4 gamma ^2-1) for the massless scalar field, where the Lorentz factor
gamma=(1 - v^2 / c^2)^(1/2). Appearance of these masking factors is connected
with the fact that rotation is defined by two parameters, angular velocity w
and the radius of rotation, in contrast with a uniformly accelerated linear
motion which is defined by only one parameter, acceleration a. Our calculations
involve classical point of view only and to the best of our knowledge these
results have not been reported in quantum theory yet.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 21:28:37 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Levin",
"Yefim S.",
""
]
] |
0704.3751 | Dmitry Garanin | D. A. Garanin and E. M. Chudnovsky | Theory of magnetic deflagration | 17 Pages, 17 Figure captions | Phys. Rev. B 76, 054410 -(13) (2007) | 10.1103/PhysRevB.76.054410 | null | cond-mat.stat-mech cond-mat.mtrl-sci | null | Theory of magnetic deflagration (avalanches) in crystals of molecular magnets
has been developed. The phenomenon resembles the burning of a chemical
substance, with the Zeeman energy playing the role of the chemical energy.
Non-destructive reversible character of magnetic deflagration, as well as the
possibility to continuously tune the flammability of the crystal by changing
the magnetic field, makes molecular magnets an attractive toy system for a
detailed study of the burning process. Besides simplicity, new features, as
compared to the chemical burning, include possibility of quantum decay of
metastable spin states and strong temperature dependence of the heat capacity
and thermal conductivity. We obtain analytical and numerical solutions for
criteria of the ignition of magnetic deflagration, and compute the ignition
rate and the speed of the developed deflagration front.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 21:38:12 GMT"
}
] | 2008-05-06T00:00:00 | [
[
"Garanin",
"D. A.",
""
],
[
"Chudnovsky",
"E. M.",
""
]
] |
0704.3752 | Thomas Cassidy | Thomas Cassidy, Brad Shelton | Generalizing the notion of Koszul algebra | null | null | null | null | math.RA | null | We introduce a generalization of the notion of a Koszul algebra, which
includes graded algebras with relations in different degrees, and we establish
some of the basic properties of these algebras. This class is closed under
twists, twisted tensor products, regular central extensions and Ore extensions.
We explore the monomial algebras in this class and we include some well-known
examples of algebras that fall into this class.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 21:52:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cassidy",
"Thomas",
""
],
[
"Shelton",
"Brad",
""
]
] |
0704.3753 | Claudia Danilowicz | C. Limouse, C. Danilowicz, V. W. Coljee, N. Kleckner, and M. Prentiss | Investigation of a new conformation of double stranded DNA | null | null | null | null | cond-mat.soft | null | It had been proposed that overstretching double stranded DNA from the 5-5
ends will produce a new fiber form of dsDNA that is narrower than the S form
that has been suggested to result when the dsDNA is overstretched from the 3-3
ends. We present the first comparison of the structures that result when dsDNA
is overstretched from the 5-5, 3-3, and 3-5 ends and show that the stability of
the overstretched form depends on the ends to which the force is applied. The
stability also depends strongly on the ionic environment as well as the
presence of reagents that bind to ssDNA.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 22:01:19 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jun 2008 14:00:28 GMT"
}
] | 2008-06-04T00:00:00 | [
[
"Limouse",
"C.",
""
],
[
"Danilowicz",
"C.",
""
],
[
"Coljee",
"V. W.",
""
],
[
"Kleckner",
"N.",
""
],
[
"Prentiss",
"M.",
""
]
] |
0704.3754 | Alok Shukla | Priay Sony and Alok Shukla | A large-scale correlated study of linear optical absorption and
low-lying excited states of polyacenes: Pariser-Parr-Pople Hamiltonian | 45 pages, 9 figures | Phys. Rev. B 75, 155208 (2007) | 10.1103/PhysRevB.75.155208 | null | cond-mat.mtrl-sci cond-mat.str-el | null | In this paper we present large-scale correlated calculations of linear
optical absorption spectrum of oligo-acenes containing up to seven benzene
rings. For the calculations we used the Pariser-Parr-Pople (P-P-P) Hamiltonian,
along with the configuration interaction (CI) technique at various levels such
as the full CI (FCI), the quadruple CI (QCI) and multi-reference
singles-doubles CI (MRSDCI). The role of Coulomb parameters used in the P-P-P
Hamiltonian was examined by considering standard Ohno parameters, as well as a
screened set of parameters. A detailed analysis of the many-body character of
the important excited states contributing to the linear absorption has also
been performed. The results of our calculations have been compared extensively
with the theoretical work of other authors, as well as with the experiments.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 22:08:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sony",
"Priay",
""
],
[
"Shukla",
"Alok",
""
]
] |
0704.3755 | Igor Erukhimovich | Igor Erukhimovich (1) and Albert Johner (2) ((1) Moscow State
University, Moscow, Russia (2) Institute Charles Sadron, Strasbourg, France) | Helical, Angular and Radial Ordering in Narrow Capillaries | 6 pages, 3 figures | Europhys. Lett. 2007, v. 79, 56004 | 10.1209/0295-5075/79/56004 | null | cond-mat.soft | null | To enlighten the nature of the order-disorder and order-order transitions in
block copolymer melts confined in narrow capillaries we analyze peculiarities
of the conventional Landau weak crystallization theory of systems confined to
cylindrical geometry. This phenomenological approach provides a quantitative
classification of the cylindrical ordered morphologies by expansion of the
order parameter spatial distribution into the eigenfunctions of the Laplace
operator. The symmetry of the resulting ordered morphologies is shown to
strongly depend both on the boundary conditions (wall preference) and the ratio
of the cylinder radius and the wave length of the critical order parameter
fluctuations, which determine the bulk ordering of the system under
consideration. In particular, occurrence of the helical morphologies is a
rather general consequence of the imposed cylindrical symmetry for narrow
enough capillaries. We discuss also the ODT and OOT involving some other
simplest morphologies. The presented results are relevant also to other
ordering systems as charge-density waves appearing under addition of an ionic
solute to a solvent in its critical region, weakly charged polyelectrolyte
solutions in poor solvent, microemulsions etc.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 22:13:16 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Erukhimovich",
"Igor",
""
],
[
"Johner",
"Albert",
""
]
] |
0704.3756 | George W. Patrick | C. Cuell and G. W. Patrick | Skew critical problems | null | null | 10.1134/S1560354707060020 | null | math-ph math.MP | null | Skew critical problems occur in continuous and discrete nonholonomic
Lagrangian systems. They are analogues of constrained optimization problems,
where the objective is differentiated in directions given by an apriori
distribution, instead of tangent directions to the constraint. We show
semiglobal existence and uniqueness for nondegenerate skew critical problems,
and show that the solutions of two skew critical problems have the same contact
as the problems themselves. Also, we develop some infrastructure that is
necessary to compute with contact order geometrically, directly on manifolds.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 22:25:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cuell",
"C.",
""
],
[
"Patrick",
"G. W.",
""
]
] |
0704.3757 | Satoshi Nakamura | Satoshi X. Nakamura (1), Anders Gardestig (2) ((1) TRIUMF, (2) South
Carolina U.) | Consistency between renormalization group running of chiral operator and
counting rule -- Case of chiral pion production operator -- | 28 pages, 5 figures, significantly changed, published version | J.Phys.G36:125007,2009 | 10.1088/0954-3899/36/12/125007 | TRI-PP-07-04 | nucl-th hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In nuclear chiral perturbation theory (ChPT), an operator is defined in a
space with a cutoff which may be varied within a certain range. The operator
runs as a result of the variation of the cutoff [renormalization group (RG)
running]. In order for ChPT to be useful, the operator should run in a way
consistent with the counting rule; that is, the running of chiral counter terms
have to be of natural size. We vary the cutoff using the Wilsonian
renormalization group (WRG) equation, and examine this consistency. As an
example, we study the s-wave pion production operator for NN\to d pi, derived
in ChPT. We demonstrate that the WRG running does not generate any
chiral-symmetry-violating (CSV) interaction, provided that we start with an
operator which does not contain a CSV term. We analytically show how the
counter terms are generated in the WRG running in case of the infinitesimal
cutoff reduction. Based on the analytic result, we argue a range of the cutoff
variation for which the running of the counter terms is of natural size. Then,
we numerically confirm this.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 22:25:18 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Dec 2007 14:31:52 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Nov 2009 17:28:56 GMT"
}
] | 2010-01-11T00:00:00 | [
[
"Nakamura",
"Satoshi X.",
""
],
[
"Gardestig",
"Anders",
""
]
] |
0704.3758 | Iddo Ben-Ari | Iddo Ben-Ari | Large Deviations for Partition Functions of Directed Polymers and Some
Other Models in an IID Field | null | null | 10.1214/08-AIHP185 | null | math.PR | null | Consider the partition function of a directed polymer in an IID field. We
assume that both tails of the negative and the positive part of the field are
at least as light as exponential. It is a well-known fact that the free energy
of the polymer is equal to a deterministic constant for almost every
realization of the field and that the upper tail of the large deviations is
exponential. The lower tail of the large deviations is typically lighter than
exponential. In this paper we provide a method to obtain estimates on the rate
of decay of the lower tail of the large deviations, which are sharp up to
multiplicative constants. As a consequence, we show that the lower tail of the
large deviations exhibits three regimes, determined according to the tail of
the negative part of the field. Our method is simple to apply and can be used
to cover other oriented and non-oriented models including first/last-passage
percolation and the parabolic Anderson model
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 23:00:22 GMT"
}
] | 2012-10-04T00:00:00 | [
[
"Ben-Ari",
"Iddo",
""
]
] |
0704.3759 | Jianhua Ruan | Jianhua Ruan and Weixiong Zhang | Identifying network communities with a high resolution | 14 pages, 5 figures. 1 supplemental file at
http://cic.cs.wustl.edu/qcut/supplemental.pdf | Phys. Rev. E 77, 016104 (2008) | 10.1103/PhysRevE.77.016104 | null | physics.soc-ph physics.comp-ph | null | Community structure is an important property of complex networks. An
automatic discovery of such structure is a fundamental task in many
disciplines, including sociology, biology, engineering, and computer science.
Recently, several community discovery algorithms have been proposed based on
the optimization of a quantity called modularity (Q). However, the problem of
modularity optimization is NP-hard, and the existing approaches often suffer
from prohibitively long running time or poor quality. Furthermore, it has been
recently pointed out that algorithms based on optimizing Q will have a
resolution limit, i.e., communities below a certain scale may not be detected.
In this research, we first propose an efficient heuristic algorithm, Qcut,
which combines spectral graph partitioning and local search to optimize Q.
Using both synthetic and real networks, we show that Qcut can find higher
modularities and is more scalable than the existing algorithms. Furthermore,
using Qcut as an essential component, we propose a recursive algorithm, HQcut,
to solve the resolution limit problem. We show that HQcut can successfully
detect communities at a much finer scale and with a higher accuracy than the
existing algorithms. Finally, we apply Qcut and HQcut to study a
protein-protein interaction network, and show that the combination of the two
algorithms can reveal interesting biological results that may be otherwise
undetectable.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 23:31:31 GMT"
}
] | 2008-04-11T00:00:00 | [
[
"Ruan",
"Jianhua",
""
],
[
"Zhang",
"Weixiong",
""
]
] |
0704.3760 | Mamdouh Wanas | M.I.Wanas | An Alternative Source for Dark Energy | 3 pages, LaTeX file, summary of a talk delivered at MG XI, held in
Berlin, July 2006 | null | 10.1142/9789812834300_0255 | null | gr-qc | null | In the present work, an alternative interpretation of the source of
accelerated expansion of the Universe is suggested. A probable candidate is the
interaction between the quantum spin of a moving particle and the torsion of
space-time, produced by the background gravitational field of the Universe.
This interaction has been suggested by the author in a previous work, with some
experimental and observational evidences for its existence. It has been shown
that this interaction gives rise to a repulsive force. The accelerated
expansion of the Universe may give a further evidence on the existence of this
interaction on the cosmological scale.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 23:05:20 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Wanas",
"M. I.",
""
]
] |
0704.3761 | Srikanth Iyengar | L. L. Avramov and S. Iyengar | Gorenstein algebras and Hochschild cohomology | This is the published version, except for updates to references and
bibliography. Sections 3, 4 and 8 have been removed from the preceding
version, arXiv:0704.3761v2. Substantial generalizations of results in those
sections are proved in our paper with Joseph Lipman and Suresh Nayak,
arXiv:0904.4004 | Mich. Math. J. 57 (2008), 17--35 | null | null | math.AC math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For homomorphism K-->S of commutative rings, where K is Gorenstein and S is
essentially of finite type and flat as a K-module, the property that all
non-trivial fiber rings of K-->S are Gorenstein is characterized in terms of
properties of the cohomology modules Ext_n^{S\otimes_KS}S{S\otimes_KS}.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 23:17:37 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 18:54:30 GMT"
},
{
"version": "v3",
"created": "Tue, 28 Apr 2009 17:10:21 GMT"
}
] | 2009-04-28T00:00:00 | [
[
"Avramov",
"L. L.",
""
],
[
"Iyengar",
"S.",
""
]
] |
0704.3762 | Marcia C. Barbosa prof | Mauricio Girardi, Marcia Szortyka and Marcia C. Barbosa | Diffusion Anomaly in a three dimensional lattice gas | null | null | 10.1016/j.physa.2007.07.008 | null | cond-mat.soft cond-mat.stat-mech | null | We investigate the relation between thermodynamic and dynamic properties of
an associating lattice gas (ALG) model. The ALG combines a three dimensional
lattice gas with particles interacting through a soft core potential and
orientational degrees of freedom. From the competition between the directional
attractive forces and the soft core potential results two liquid phases, double
criticality and density anomaly. We study the mobility of the molecules in this
model by calculating the diffusion constant at a constant temperature, $D$. We
show that $D$ has a maximum at a density $\rho_{max}$ and a minimum at a
density $\rho_{min}<\rho_{max}$. Between these densities the diffusivity
differs from the one expected for normal liquids. We also show that in the
pressure-temperature phase-diagram the line of extrema in diffusivity is close
to the liquid-liquid critical point and it is partially inside the temperature
of maximum density (TMD) line.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 23:25:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Girardi",
"Mauricio",
""
],
[
"Szortyka",
"Marcia",
""
],
[
"Barbosa",
"Marcia C.",
""
]
] |
0704.3763 | Marco Barbieri | Marco Barbieri | Effects of frequency correlation in linear optical entangling gate
operated with independent photons | Replaced with published version | Phys. Rev. A 76, 043825 (2007). | 10.1103/PhysRevA.76.043825 | null | quant-ph | null | Bose-Einstein coalescence of independent photons at the surface of a beam
splitter is the physical process that allows linear optical quantum gates to be
built. When distinct parametric down-conversion events are used as an
independent photon source, distinguishability arises form the energy
correlation of each photon with its twin. We find that increasing the pump
bandwidth may help in improving the visibility of non-classical interference
and reaching a level of near perfect indistinguishability. PACS: 03.67.Mn,
42.65.Lm, 42.50.St.
| [
{
"version": "v1",
"created": "Sun, 29 Apr 2007 23:33:36 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Oct 2007 02:41:20 GMT"
}
] | 2009-10-29T00:00:00 | [
[
"Barbieri",
"Marco",
""
]
] |
0704.3764 | P Ajith | P. Ajith, S. Babak, Y. Chen, M. Hewitson, B. Krishnan, J. T. Whelan,
B. Bruegmann, P. Diener, J. Gonzalez, M. Hannam, S. Husa, M. Koppitz, D.
Pollney, L. Rezzolla, L. Santamaria, A. M. Sintes, U. Sperhake and J.
Thornburg | Phenomenological template family for black-hole coalescence waveforms | Minor changes, Submitted to Class. Quantum Grav. (Proc. GWDAW11) | Class.Quant.Grav.24:S689-S700,2007 | 10.1088/0264-9381/24/19/S31 | AEI-2007-029 | gr-qc astro-ph | null | Recent progress in numerical relativity has enabled us to model the
non-perturbative merger phase of the binary black-hole coalescence problem.
Based on these results, we propose a phenomenological family of waveforms which
can model the inspiral, merger, and ring-down stages of black hole coalescence.
We also construct a template bank using this family of waveforms and discuss
its implementation in the search for signatures of gravitational waves produced
by black-hole coalescences in the data of ground-based interferometers. This
template bank might enable us to extend the present inspiral searches to
higher-mass binary black-hole systems, i.e., systems with total mass greater
than about 80 solar masses, thereby increasing the reach of the current
generation of ground-based detectors.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 15:45:13 GMT"
},
{
"version": "v2",
"created": "Tue, 1 May 2007 08:52:02 GMT"
},
{
"version": "v3",
"created": "Wed, 11 Jul 2007 13:21:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ajith",
"P.",
""
],
[
"Babak",
"S.",
""
],
[
"Chen",
"Y.",
""
],
[
"Hewitson",
"M.",
""
],
[
"Krishnan",
"B.",
""
],
[
"Whelan",
"J. T.",
""
],
[
"Bruegmann",
"B.",
""
],
[
"Diener",
"P.",
""
],
[
"Gonzalez",
"J.",
""
],
[
"Hannam",
"M.",
""
],
[
"Husa",
"S.",
""
],
[
"Koppitz",
"M.",
""
],
[
"Pollney",
"D.",
""
],
[
"Rezzolla",
"L.",
""
],
[
"Santamaria",
"L.",
""
],
[
"Sintes",
"A. M.",
""
],
[
"Sperhake",
"U.",
""
],
[
"Thornburg",
"J.",
""
]
] |
0704.3765 | Viktor A. Podolskiy | Alexander A. Govyadinov, Mikhail A. Noginov, Viktor A. Podolskiy | Active metamaterials: sign of refraction index and gain-assisted
dispersion management | null | Appl. Phys. Lett. v.91, p.191103 (2007) | 10.1063/1.2800309 | null | physics.optics physics.gen-ph | null | We derive an approach to define the causal direction of the wavevector of
modes in optical metamaterials, which in turn, determines signs of refractive
index and impedance as a function of {\it real and imaginary} parts of
dielectric permittivity and magnetic permeability. We use the developed
technique to demonstrate that the interplay between resonant response of
constituents of metamaterials can be used to achieve efficient dispersion
management. Finally we demonstrate broadband dispersion-less index and
impedance matching in active nanowire-based negative index materials. Our work
opens new practical applications of negative index composites for broadband
lensing, imaging, and pulse-routing.
| [
{
"version": "v1",
"created": "Fri, 27 Apr 2007 23:58:57 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Govyadinov",
"Alexander A.",
""
],
[
"Noginov",
"Mikhail A.",
""
],
[
"Podolskiy",
"Viktor A.",
""
]
] |
0704.3766 | Matthias Schr\"oter | Robert S. Shaw, Norman Packard, Matthias Schr\"oter, Harry L. Swinney | Geometry-induced asymmetric diffusion | published with minuscule changes | PNAS 104, 9580-9584 (2007) | 10.1073/pnas.0703280104 | null | cond-mat.soft | null | Past work has shown that ions can pass through a membrane more readily in one
direction than the other. We demonstrate here in a model and an experiment that
for a mixture of small and large particles such asymmetric diffusion can arise
solely from an asymmetry in the geometry of the pores of the membrane. Our
deterministic simulation considers a two-dimensional gas of elastic disks of
two sizes diffusing through a membrane, and our laboratory experiment examines
the diffusion of glass beads of two sizes through a metal membrane. In both
experiment and simulation, the membrane is permeable only to the smaller
particles, and the asymmetric pores lead to an asymmetry in the diffusion rates
of these particles. The presence of even a small percentage of large particles
can clog a membrane, preventing passage of the small particles in one direction
while permitting free flow of the small particles in the other direction. The
purely geometric kinetic constraints may play a role in common biological
contexts such as membrane ion channels.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 00:00:12 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 20:49:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shaw",
"Robert S.",
""
],
[
"Packard",
"Norman",
""
],
[
"Schröter",
"Matthias",
""
],
[
"Swinney",
"Harry L.",
""
]
] |
0704.3767 | Javier Fresan | Javier Fresan | A new proof of the Beez-Cartan theorem | null | Int. Math. For, 2, 2007, 1281-1293 | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper has been withdrawn by the author.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 00:24:05 GMT"
},
{
"version": "v2",
"created": "Sat, 13 Jun 2009 10:50:35 GMT"
}
] | 2009-06-15T00:00:00 | [
[
"Fresan",
"Javier",
""
]
] |
0704.3768 | Baorong Chang | Baorong Chang, Hongya Liu, Lixin Xu and Chengwu Zhang | Statefinder Diagnostic for Phantom Model with
$V(\phi)=V_{0}\exp(-\lambda{\phi}^2)$ | 4 pages, 5 figures. accepted by Chin. Phys. Lett | Chin.Phys.Lett.24:2153-2156,2007 | 10.1088/0256-307X/24/7/102 | null | astro-ph | null | We investigate the phantom field with potential
$V(\phi)=V_{0}\exp(-\lambda{\phi}^2)$ and dark matter in the spatially flat FRW
model. It has been shown by numerical calculation that there is a attractor
solution in this model. We also apply the statefinder diagnostic to this
phantom model. It is shown that the evolving trajectories of this scenario in
the $s-r$ diagram is quite different form other dark energy models.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 01:07:57 GMT"
},
{
"version": "v2",
"created": "Thu, 3 May 2007 07:55:10 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Chang",
"Baorong",
""
],
[
"Liu",
"Hongya",
""
],
[
"Xu",
"Lixin",
""
],
[
"Zhang",
"Chengwu",
""
]
] |
0704.3769 | Matthew Glenz | Matthew M. Glenz and Koji Uryu | Circular solution of two unequal mass particles in post-Minkowski
approximation | 4 pages, 4 figures, 4/27/07 | Phys.Rev.D76:027501,2007 | 10.1103/PhysRevD.76.027501 | DPUR/TH/2 | gr-qc | null | A Fokker action for post-Minkowski approximation with the first
post-Newtonian correction is introduced in our previous paper, and a solution
for the helically symmetric circular orbit is obtained. We present supplemental
results for the circular solution of two unequal mass point-particles. Circular
solutions for selected mass ratios are found numerically, and analytic formulas
in the extreme mass ratio limit are derived. The leading terms of the analytic
formulas agree with the first post-Newtonian formulas in this limit.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 02:12:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Glenz",
"Matthew M.",
""
],
[
"Uryu",
"Koji",
""
]
] |
0704.3770 | Yongjae Park | Yongjae Park, Kyung-Il Kim, Taesoo Song, Su Houng Lee, Cheuk-Yin Wong | The widths of quarkonia in quark gluon plasma | 7 pages, 13 figures, 2 tables, version to be published in Phys. Rev.
C | Phys.Rev.C76:044907,2007 | 10.1103/PhysRevC.76.044907 | null | hep-ph | null | Recent lattice calculations showed that the quarkonia will survive beyond the
phase transition temperature, and will dissolve at different temperatures
depending on the type of the quarkonium. In this work, we calculate the thermal
width of the quarkonium at finite temperature before it dissolves into open
heavy quarks. The input of the calculation are the parton quarkonium
dissociation cross section to NLO in QCD, the quarkonium wave function in a
temperature-dependent potential from lattice QCD, and a thermal distribution of
partons with thermal masses. We find that for the J/psi, the total thermal
width above 1.4 Tc becomes larger than 100 to 250 MeV, depending on the
effective thermal masses of the quark and gluon, which we take between 400 to
600 MeV. Such a width corresponds to an effective dissociation cross section by
gluons between 1.5 to 3.5 mb and by quarks 1 to 2 mb at 1.4 Tc. However, at
similar temperatures, we find a much smaller thermal width and effective cross
section for the upsilon.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 04:34:26 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Sep 2007 02:59:59 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Park",
"Yongjae",
""
],
[
"Kim",
"Kyung-Il",
""
],
[
"Song",
"Taesoo",
""
],
[
"Lee",
"Su Houng",
""
],
[
"Wong",
"Cheuk-Yin",
""
]
] |
0704.3771 | James P. Crutchfield | Olof Gornerup and James P. Crutchfield | Primordial Evolution in the Finitary Process Soup | 7 pages, 10 figures;
http://cse.ucdavis.edu/~cmg/compmech/pubs/pefps.htm | null | 10.1142/9789812779953_0012 | null | q-bio.PE q-bio.MN | null | A general and basic model of primordial evolution--a soup of reacting
finitary and discrete processes--is employed to identify and analyze
fundamental mechanisms that generate and maintain complex structures in
prebiotic systems. The processes--$\epsilon$-machines as defined in
computational mechanics--and their interaction networks both provide well
defined notions of structure. This enables us to quantitatively demonstrate
hierarchical self-organization in the soup in terms of complexity. We found
that replicating processes evolve the strategy of successively building higher
levels of organization by autocatalysis. Moreover, this is facilitated by local
components that have low structural complexity, but high generality. In effect,
the finitary process soup spontaneously evolves a selection pressure that
favors such components. In light of the finitary process soup's generality,
these results suggest a fundamental law of hierarchical systems: global
complexity requires local simplicity.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 02:47:17 GMT"
}
] | 2016-11-23T00:00:00 | [
[
"Gornerup",
"Olof",
""
],
[
"Crutchfield",
"James P.",
""
]
] |
0704.3772 | Patrick B. Hall | Patrick B. Hall (1), Sarah I. Sadavoy (1), Damien Hutsemekers (2),
John E. Everett (3), Alireza Rafiee (1) ((1) York University, (2) University
of Li\`ege, (3) University of Wisconsin-Madison) | Acceleration and Substructure Constraints in a Quasar Outflow | 14 emulateapj pages, 7 figures, ApJ in press | Astrophys.J.665:174-186,2007 | 10.1086/519273 | null | astro-ph | null | We present observations of probable line-of-sight acceleration of a broad
absorption trough of C IV in the quasar SDSS J024221.87+004912.6. We also
discuss how the velocity overlap of two other outflowing systems in the same
object constrains the properties of the outflows. The Si IV doublet in each
system has one unblended transition and one transition which overlaps with
absorption from the other system. The residual flux in the overlapping trough
is well fit by the product of the residual fluxes in the unblended troughs. For
these optically thick systems to yield such a result, at least one of them must
consist of individual subunits rather than being a single structure with
velocity-dependent coverage of the source. If these subunits are identical,
opaque, spherical clouds, we estimate the cloud radius to be r = 3.9 10^15 cm.
If they are identical, opaque, linear filaments, we estimate their width to be
w = 6.5 10^14 cm. These subunits are observed to cover the Mg II broad emission
line region of the quasar, at which distance from the black hole the above
filament width is equal to the predicted scale height of the outer atmosphere
of a thin accretion disk. Insofar as that scale height is a natural size scale
for structures originating in an accretion disk, these observations are
evidence that the accretion disk can be a source of quasar absorption systems.
Based on data from ESO program 075.B-0190(A).
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 03:11:36 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Hall",
"Patrick B.",
""
],
[
"Sadavoy",
"Sarah I.",
""
],
[
"Hutsemekers",
"Damien",
""
],
[
"Everett",
"John E.",
""
],
[
"Rafiee",
"Alireza",
""
]
] |
0704.3773 | Sam Tannous | Sam Tannous | Avoiding Rotated Bitboards with Direct Lookup | 7 pages, 1 figure, 4 listings; replaced test positions, fixed typos | ICGA Journal, Vol. 30, No. 2, pp. 85-91. (June 2007). | null | null | cs.DS | null | This paper describes an approach for obtaining direct access to the attacked
squares of sliding pieces without resorting to rotated bitboards. The technique
involves creating four hash tables using the built in hash arrays from an
interpreted, high level language. The rank, file, and diagonal occupancy are
first isolated by masking the desired portion of the board. The attacked
squares are then directly retrieved from the hash tables. Maintaining
incrementally updated rotated bitboards becomes unnecessary as does all the
updating, mapping and shifting required to access the attacked squares.
Finally, rotated bitboard move generation speed is compared with that of the
direct hash table lookup method.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 03:11:59 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jul 2007 19:23:39 GMT"
}
] | 2007-10-09T00:00:00 | [
[
"Tannous",
"Sam",
""
]
] |
0704.3774 | Huai-Bin Zhuang | Huai-Bin Zhuang, Michael Ma, Xi Dai, Fu-Chun Zhang | Mott Insulator - Superfluid Transitions in a Two Band Model at Finite
Temperature and Possible Application to Supersolid 4He | null | null | 10.1103/PhysRevB.76.174504 | null | cond-mat.stat-mech | null | We study Mott insulator - superfluid transition in a two-band boson Hubbard
model, which can be mapped onto a spin-1/2 XY model with spins coupled to an
additional Ising degree of freedom. By using a modified mean field theory that
include the effects of phase fluctuations, we show that the transition is first
order at both zero and finite temperatures. On the Mott insulator side, there
may be reentrance in phase transition. These features are consequences of the
underlying transition between competing defect poor and defect rich phases. The
relevance of the model and our results to supersolid 4He and cold bosonic atoms
in optical lattices are discussed.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 03:31:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhuang",
"Huai-Bin",
""
],
[
"Ma",
"Michael",
""
],
[
"Dai",
"Xi",
""
],
[
"Zhang",
"Fu-Chun",
""
]
] |
0704.3775 | Yu Zhiyong | Zhen Wu, Zhiyong Yu | Dynamic programming principle for one kind of stochastic recursive
optimal control problem and Hamilton-Jacobi-Bellman equations | 31 pages | null | null | null | math.OC math.PR | null | In this paper, we study one kind of stochastic recursive optimal control
problem with the obstacle constraints for the cost function where the cost
function is described by the solution of one reflected backward stochastic
differential equations. We will give the dynamic programming principle for this
kind of optimal control problem and show that the value function is the unique
viscosity solution of the obstacle problem for the corresponding
Hamilton-Jacobi-Bellman equations.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 03:52:16 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Wu",
"Zhen",
""
],
[
"Yu",
"Zhiyong",
""
]
] |
0704.3776 | Luis Guillermo Cota Preciado | Luis Guillermo Cota, Pilar Alonso-Reyes, Pablo de la Mora | On the limits of surface fractal behaviour in silica. A virtual
adsorbates simulation | 14 pages, 8 figures (3 in color) | null | null | null | cond-mat.mtrl-sci | null | A computer simulation technique, suited to replicate real adsorption
experiments, was applied to pure simulated silica in order to gain insight into
the fractal regime of its surface. The previously reported experimental fractal
dimension was closely approached and the hitherto uncharted lower limit of
fractal surface behaviour is reported herein.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 04:16:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cota",
"Luis Guillermo",
""
],
[
"Alonso-Reyes",
"Pilar",
""
],
[
"de la Mora",
"Pablo",
""
]
] |
0704.3777 | Dhananjay Mehendale | Dhananjay P. Mehendale | On the Theory of Colorful Graphs | 10 pages | null | null | null | math.GM | null | The theory of colorful graphs can be developed by working in Galois field
modulo (p), p > 2 and a prime number. The paper proposes a program of possible
conversion of graph theory into a pleasant colorful appearance. We propose to
paint the usual black (indicating presence of an edge) and white (indicating
absence of an edge) edges of graphs using multitude of colors and study their
properties. All colorful graphs considered here are simple, i.e. not having any
multiple edges or self-loops. This paper is an invitation to the program of
generalizing usual graph theory in this direction.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 04:33:36 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mehendale",
"Dhananjay P.",
""
]
] |
0704.3778 | Terry Mart | T. Mart | From Pauli Principle to Hypernucleus, Neutron Star, and Econophysics | 24 pages, 20 figures, keynote talk given at 3rd Saudi Physical
Society meeting, Riyadh, Saudi Arabia, 18-20 December 2006 | null | null | null | nucl-th | null | Proposed by Wolfgang Pauli more than 80 years ago, the exclusion principle
has been proven to have a far-reaching consequence, from femtoscopic world to
macroscopic, super-dense, and fully relativistic physics. Starting from this
principle, we discuss two interesting research topics, which have currently
drawn considerable attention in the nuclear- and astrophysics communities; the
hypernuclear and neutron star physics. Special attention is given to the
electromagnetic production of the hypertriton and the consequences of the
neutrino electromagnetic properties in dense matter. We also touch on the new
arena which could also be fascinating for physicists; the econophysics.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 07:38:20 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Mart",
"T.",
""
]
] |
0704.3779 | Michael Ibison | M. Ibison | Emergent gravity from direct-action EM in a toy universe of electrons
and positrons | Revised & submitted to Physica Scripta | null | null | null | physics.gen-ph | null | We sketch the derivation of a Newtonian gravity-like force emerging from a
direct-action variant of classical electromagnetism. The binding energy is a
consequence of maximal phase correlation of the sources mediated by
approximately monochromatic direct-action fields. The resulting force then has
the character of a strong version of the van der Waals force, whose superior
strength can be attributed to relatively coherent primary fields (compared with
the totally incoherent effects of the ZPF). The model also predicts the
existence of a background having some of the character of dark energy.
| [
{
"version": "v1",
"created": "Mon, 30 Apr 2007 17:53:54 GMT"
},
{
"version": "v2",
"created": "Mon, 29 Oct 2007 22:44:05 GMT"
}
] | 2007-10-30T00:00:00 | [
[
"Ibison",
"M.",
""
]
] |
0704.3780 | Jean-Philippe Rennard | Pierre Collet, Jean-Philippe Rennard | Stochastic Optimization Algorithms | 16 pages, 4 figures, 2 tables | Rennard, J.-P., Handbook of Research on Nature Inspired Computing
for Economics and Management, IGR, 2006 | null | null | cs.NE | null | When looking for a solution, deterministic methods have the enormous
advantage that they do find global optima. Unfortunately, they are very
CPU-intensive, and are useless on untractable NP-hard problems that would
require thousands of years for cutting-edge computers to explore. In order to
get a result, one needs to revert to stochastic algorithms, that sample the
search space without exploring it thoroughly. Such algorithms can find very
good results, without any guarantee that the global optimum has been reached;
but there is often no other choice than using them. This chapter is a short
introduction to the main methods used in stochastic optimization.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 06:52:19 GMT"
}
] | 2011-12-20T00:00:00 | [
[
"Collet",
"Pierre",
""
],
[
"Rennard",
"Jean-Philippe",
""
]
] |
0704.3781 | Laurent Chevillard | Yi Li, Laurent Chevillard, Gregory Eyink and Charles Meneveau | Matrix Exponential-Based Closures for the Turbulent Subgrid-Scale Stress
Tensor | 10 pages, 4 figures, published version | Phys. Rev. E 79, 016305 (2009) | 10.1103/PhysRevE.79.016305 | null | physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two approaches for closing the turbulence subgrid-scale stress tensor in
terms of matrix exponentials are introduced and compared. The first approach is
based on a formal solution of the stress transport equation in which the
production terms can be integrated exactly in terms of matrix exponentials.
This formal solution of the subgrid-scale stress transport equation is shown to
be useful to explore special cases, such as the response to constant velocity
gradient, but neglecting pressure-strain correlations and diffusion effects.
The second approach is based on an Eulerian-Lagrangian change of variables,
combined with the assumption of isotropy for the conditionally averaged
Lagrangian velocity gradient tensor and with the `Recent Fluid Deformation'
(RFD) approximation. It is shown that both approaches lead to the same basic
closure in which the stress tensor is expressed as the product of the matrix
exponential of the resolved velocity gradient tensor multiplied by its
transpose. Short-time expansions of the matrix exponentials are shown to
provide an eddy-viscosity term and particular quadratic terms, and thus allow a
reinterpretation of traditional eddy-viscosity and nonlinear stress closures.
The basic feasibility of the matrix-exponential closure is illustrated by
implementing it successfully in Large Eddy Simulation of forced isotropic
turbulence. The matrix-exponential closure employs the drastic approximation of
entirely omitting the pressure-strain correlation and other `nonlinear
scrambling' terms. But unlike eddy-viscosity closures, the matrix exponential
approach provides a simple and local closure that can be derived directly from
the stress transport equation with the production term, and using physically
motivated assumptions about Lagrangian decorrelation and upstream isotropy.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 06:59:59 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Jun 2007 14:44:28 GMT"
},
{
"version": "v3",
"created": "Wed, 21 Jan 2009 08:29:36 GMT"
}
] | 2009-01-21T00:00:00 | [
[
"Li",
"Yi",
""
],
[
"Chevillard",
"Laurent",
""
],
[
"Eyink",
"Gregory",
""
],
[
"Meneveau",
"Charles",
""
]
] |
0704.3782 | J. P. Ma | F. Feng, J.P. Ma and Q. Wang | Resummation of Large Logarithms in $\gamma^* \pi^0 \to \gamma $ | one reference added | JHEP 0706:039,2007 | 10.1088/1126-6708/2007/06/039 | null | hep-ph hep-th | null | In the collinear factorization of the form factor for the transition
$\gamma^* \pi^0 \to \gamma$ the hard part contains double log terms as $\ln^2
x$ with $x$ as the momentum fraction of partons from 0 to 1. A simple
exponentiation for resummation leads to divergent results. We study the
resummation of these $\ln^2 x$ terms. We show that the $\ln^2 x$ terms come
partly from the light-cone wave function(LCWF) and partly from the form factor.
We introduce a jet factor to factorize the $\ln^2 x$ term in the form factor.
To handel the $\ln^2 x$ terms from the LCWF we introduce a nonstandard
light-cone wave function(NLCWF) with the gauge links off the light-cone
direction. An interesting relation between two wave function is found. With the
introduced NLCWF and the jet factor we can re-factorize the form factor and
obtain a new hard part which does not contain terms with $\ln^2 x$. Beside the
renormalization scale $\mu$ the introduce NLCWF and jet factor have extra
scales to characterize their $x$-behaviors. Using the evolutions of the extra
scales and the relation we can do the resummation perturbatively in sense that
the LCWF is the only nonpertubative object in the resumed formula. Our results
with some models of LCWF show that there is a significant difference between
numerical predictions with the resummation and that without the resummation,
and the resummed predictions can describe the experimental data.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 08:24:00 GMT"
},
{
"version": "v2",
"created": "Sun, 6 May 2007 05:25:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Feng",
"F.",
""
],
[
"Ma",
"J. P.",
""
],
[
"Wang",
"Q.",
""
]
] |
0704.3783 | Chandan Singh Dalawat | Chandan Singh Dalawat | Congruent numbers, elliptic curves, and the passage from the local to
the global | null | Resonance, December 2009, pp.~1183--1205. | null | null | math.HO math.GM | null | The ancient unsolved problem of congruent numbers has been reduced to one of
the major questions of contemporary arithmetic: the finiteness of the number of
curves over $\bf Q$ which become isomorphic at every place to a given curve. We
give an elementary introduction to congruent numbers and their conjectural
characterisation, discuss local-to-global issues leading to the finiteness
problem, and list a few results and conjectures in the arithmetic theory of
elliptic curves.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 08:32:53 GMT"
}
] | 2010-03-15T00:00:00 | [
[
"Dalawat",
"Chandan Singh",
""
]
] |
0704.3784 | Ivan Stefanov | Ivan Zh. Stefanov, Stoytcho S. Yazadjiev, Michail D. Todorov | Scalar-tensor black holes coupled to Born-Infeld nonlinear
electrodynamics | 12 pages, 4 figures, PRD | Phys.Rev.D75:084036,2007 | 10.1103/PhysRevD.75.084036 | null | gr-qc | null | The non-existence of asymptotically flat, neutral black holes and
asymptotically flat, charged black holes in the Maxwell electrodynamics, with
non-trivial scalar field has been proved for a large class of scalar-tensor
theories. The no-scalar-hair theorems, however, do not apply in the case of
non-linear electrodynamics. In the present work numerical solutions describing
charged black holes coupled to Born-Infeld type non-linear electrodynamics in
scalar-tensor theories of gravity with massless scalar field are found. The
causal structure and properties of the solutions are studied, and a comparison
between these solutions and the corresponding solutions in the General
Relativity is made. The presence of the scalar field leads to a much more
simple causal structure. The present class of black holes has a single,
non-degenerate horizon, i.e., its causal structure resembles that of the
Schwarzschild black hole.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 09:00:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Stefanov",
"Ivan Zh.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Todorov",
"Michail D.",
""
]
] |
0704.3785 | Xavier Tolsa | David Preiss, Xavier Tolsa, and Tatiana Toro | On the smoothness of H\"older-doubling measures | 26 pages, 1 figure | null | null | null | math.CA math.FA | null | In this paper we consider the question of whether the doubling character of a
measure supported on a subset of $\RR^m$ determines the regularity of its
support (in a classical sense). This problem was studied by David, Kenig and
Toro for codimension 1 sets under the assumption that the support be flat. Here
we study the higher codimension case and remove the flatness hypothesis.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 09:09:31 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Preiss",
"David",
""
],
[
"Tolsa",
"Xavier",
""
],
[
"Toro",
"Tatiana",
""
]
] |
0704.3786 | Marco Polini | Marco Polini, Reza Asgari, Yafis Barlas, T. Pereg-Barnea, and A.H.
MacDonald | Graphene: A Pseudochiral Fermi Liquid | 15 pages, 4 figures, submitted | Solid State Commun. 143, 58 (2007) | 10.1016/j.ssc.2007.04.035 | null | cond-mat.mes-hall | null | Doped graphene sheets are pseudochiral two-dimensional Fermi liquids with
abnormal electron-electron interaction physics. We address graphene's Fermi
liquid properties quantitatively using a microscopic random-phase-approximation
theory and comment on the importance of using exchange-correlation potentials
based on the properties of a chiral two-dimensional electron gas in
density-functional-theory applications to graphene nanostructures.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 09:17:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Polini",
"Marco",
""
],
[
"Asgari",
"Reza",
""
],
[
"Barlas",
"Yafis",
""
],
[
"Pereg-Barnea",
"T.",
""
],
[
"MacDonald",
"A. H.",
""
]
] |
0704.3787 | Saifullah | Saifullah | Some Exact Solutions to Equations of Motion of an Incompressible Third
Grade Fluid | 6 pages, 7 figures | Journal of Fluids Engineering (Vol.130, Iss.6), 061401, 2008 | 10.1115/1.2928407 | null | math-ph math.MP | null | This investigation deals with some exact solutions of the equations governing
the steady plane motions of an incompressible third grade fluid by using
complex variables and complex functions. Some of the solutions admit, as
particular cases, all the solutions of Moro et al[1].
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 09:48:42 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Feb 2008 07:01:00 GMT"
}
] | 2008-06-16T00:00:00 | [
[
"Saifullah",
"",
""
]
] |
0704.3788 | Yoav Lahini | Yoav Lahini, Assaf Avidan, Francesca Pozzi, Marc Sorel, Roberto
Morandotti, Demetrios N. Christodoulides and Yaron Silberberg | Anderson localization and nonlinearity in one dimensional disordered
photonic lattices | 4 pages, 4 figures. Slightly different then the published version.
Comments welcome | Phys. Rev. Lett. 100, 013906 (2008) | 10.1103/PhysRevLett.100.013906 | null | cond-mat.other cond-mat.dis-nn nlin.PS quant-ph | null | We experimentally investigate the evolution of linear and nonlinear waves in
a realization of the Anderson model using disordered one dimensional waveguide
lattices. Two types of localized eigenmodes, flat-phased and staggered, are
directly measured. Nonlinear perturbations enhances localization in one type,
and induce delocalization in the other. In a complementary approach, we study
the evolution on short time scales of $\delta$-like wavepackets in the presence
of disorder. A transition from ballistic wavepacket expansion to exponential
(Anderson) localization is observed. We find an intermediate regime in which
the ballistic and localized components coexist while diffusive dynamics is
absent. Evidence is found for a faster transition into localization under
nonlinear conditions.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 09:53:59 GMT"
},
{
"version": "v2",
"created": "Sun, 20 May 2007 19:32:25 GMT"
},
{
"version": "v3",
"created": "Sat, 11 Aug 2007 14:02:56 GMT"
},
{
"version": "v4",
"created": "Thu, 7 Feb 2008 20:04:56 GMT"
}
] | 2010-12-09T00:00:00 | [
[
"Lahini",
"Yoav",
""
],
[
"Avidan",
"Assaf",
""
],
[
"Pozzi",
"Francesca",
""
],
[
"Sorel",
"Marc",
""
],
[
"Morandotti",
"Roberto",
""
],
[
"Christodoulides",
"Demetrios N.",
""
],
[
"Silberberg",
"Yaron",
""
]
] |
0704.3789 | Masayuki Sato | M. Sato and A. J. Sievers | Driven localized excitations in the acoustic spectrum of small nonlinear
macroscopic and microscopic lattices | Physical Review Letters, accepted | null | 10.1103/PhysRevLett.98.214101 | null | nlin.PS | null | Both bright and dark traveling, locked, intrinsic localized modes (ILMs) have
been generated with a spatially uniform driver at a frequency in the acoustic
spectrum of a nonlinear micromechanical cantilever array. Complementary
numerical simulations show that a minimum density of modes, hence array size,
is required for the formation of such locked smoothly running excitations.
Additional simulations on a small 1-D antiferromagnetic spin system are used to
illustrate that such uniformly driven running ILMs should be a generic feature
of a nanoscale atomic lattice.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 09:56:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sato",
"M.",
""
],
[
"Sievers",
"A. J.",
""
]
] |
0704.3790 | Hsiang-nan Li | Soumitra Nandi and Hsiang-nan Li | Next-to-leading-order corrections to exclusive processes in $k_T$
factorization | 13 pages; version to appear in Physical Review D | Phys.Rev.D76:034008,2007 | 10.1103/PhysRevD.76.034008 | CU-Phys/05/2007 | hep-ph | null | We calculate next-to-leading-order (NLO) corrections to exclusive processes
in $k_T$ factorization theorem, taking $\pi\gamma^*\to\gamma$ as an example.
Partons off-shell by $k_T^2$ are considered in both the quark diagrams from
full QCD and the effective diagrams for the pion wave function. The gauge
dependences in the above two sets of diagrams cancel, when deriving the
$k_T$-dependent hard kernel as their difference. The gauge invariance of the
hard kernel is then proven to all orders by induction. The light-cone
singularities in the $k_T$-dependent pion wave function are regularized by
rotating the Wilson lines away from the light cone. This regularization
introduces a factorization-scheme dependence into the hard kernel, which can be
minimized in the standard way. Both the large double logarithms $\ln^2k_T$ and
$\ln^2 x$, $x$ being a parton momentum fraction, arise from the loop correction
to the virtual photon vertex, the former being absorbed into the pion wave
function and organized by the $k_T$ resummation, and the latter absorbed into a
jet function and organized by the threshold resummation. The NLO corrections
are found to be only few-percent for $\pi\gamma^*\to\gamma$, if setting the
factorization scale to the momentum transfer from the virtual photon.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 10:27:23 GMT"
},
{
"version": "v2",
"created": "Sun, 19 Aug 2007 11:59:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nandi",
"Soumitra",
""
],
[
"Li",
"Hsiang-nan",
""
]
] |
0704.3791 | Marius Buliga | Marius Buliga | Microfractured media with a scale and Mumford-Shah energies | null | null | null | null | math.AP | null | We want to understand he concentration of damage in microfractured elastic
media. Due to the different scallings of the volume and area (or area and
length in two dimensions) the traditional method of homogenization using
periodic arrays of cells seems to fail when applied to the Mumford-Shah
functional and to periodically fractured domains.
In the present paper we are departing from traditional homogenization. The
main result implies the use of Mumford-Shah energies and leads to an
explanation of the observed concentration of damage in microfractured elastic
bodies.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 10:36:10 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Buliga",
"Marius",
""
]
] |
0704.3792 | Masatoshi Imada | Takeshi Aimi and Masatoshi Imada | Gaussian-Basis Monte Carlo Method for Numerical Study on Ground States
of Itinerant and Strongly Correlated Electron Systems | 24 pages, 25 figures | J. Phys. Soc. Jpn. 76 (2007) 084709 | 10.1143/JPSJ.76.084709 | null | cond-mat.str-el cond-mat.stat-mech | null | We examine Gaussian-basis Monte Carlo method (GBMC) introduced by Corney and
Drummond. This method is based on an expansion of the density-matrix operator
rho by means of the coherent Gaussian-type operator basis Lambda and does not
suffer from the minus sign problem. The original method, however, often fails
in reproducing the true ground state and causes systematic errors of calculated
physical quantities because the samples are often trapped in some metastable or
symmetry broken states. To overcome this difficulty, we combine the
quantum-number projection scheme proposed by Assaad, Werner, Corboz, Gull and
Troyer in conjunction with the importance sampling of the original GBMC method.
This improvement allows us to carry out the importance sampling in the
quantum-number-projected phase-space. Some comparisons with the previous
quantum-number projection scheme indicate that, in our method, the convergence
with the ground state is accelerated, which makes it possible to extend the
applicability and widen the range of tractable parameters in the GBMC method.
The present scheme offers an efficient practical way of computation for
strongly correlated electron systems beyond the range of system sizes,
interaction strengths and lattice structures tractable by other computational
methods such as the quantum Monte Carlo method.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 10:39:10 GMT"
}
] | 2007-08-29T00:00:00 | [
[
"Aimi",
"Takeshi",
""
],
[
"Imada",
"Masatoshi",
""
]
] |
0704.3793 | Hossein Sadeghi | H. Sadeghi | Neutron-Deuteron System and Photon Polarization Parameter at Thermal
Neutron Energies | 10 pages, 3 figures, 2 tables | Phys.Rev.C75:044002,2007 | 10.1103/PhysRevC.75.044002 | null | nucl-th | null | Effective Field Theory(EFT) is, the unique, model independent and systematic
low-energy version of QCD for processes involving momenta below the pion mass.
A low-energy photo-nuclear observable in three-body systems, photon
polarization parameter at thermal neutron energies is calculated by using
pionless EFT up to next-to-next to leading order(N$^2$LO). In order to make a
comparative study of this model, we compared our results for photon
polarization parameter with the realistic Argonne $v_{18}$ two-nucleon and
Urbana IX or Tucson-Melbourne three-nucleon interactions. Three-body currents
give small but significant contributions to some of the observables in the
neutron-deuteron radiative capture cross section at thermal neutron energies.
In this formalism the three-nucleon forces are needed up to N$^2$LO for cut-off
independent results. Our result converges order by order in low energy
expansion and also cut-off independent at this order.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 10:44:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sadeghi",
"H.",
""
]
] |
0704.3794 | Fred MacKintosh | Fred C. MacKintosh and Alex J. Levine | Non-equilibrium mechanics and dynamics of motor activated gels | 21 pages, 8 figures | null | 10.1103/PhysRevLett.100.018104 | null | cond-mat.soft cond-mat.stat-mech | null | The mechanics of cells is strongly affected by molecular motors that generate
forces in the cellular cytoskeleton. We develop a model for cytoskeletal
networks driven out of equilibrium by molecular motors exerting transient
contractile stresses. Using this model we show how motor activity can
dramatically increase the network's bulk elastic moduli. We also show how motor
binding kinetics naturally leads to enhanced low-frequency stress fluctuations
that result in non-equilibrium diffusive motion within an elastic network, as
seen in recent \emph{in vitro} and \emph{in vivo} experiments.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 11:37:54 GMT"
},
{
"version": "v2",
"created": "Sun, 30 Sep 2007 14:43:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"MacKintosh",
"Fred C.",
""
],
[
"Levine",
"Alex J.",
""
]
] |
0704.3795 | Mahendra K. Verma | Supriyo Pal, Krishna Kumar, Mahendra K. Verma, Daniele Carati, Arnab
K. De, Vinayak Eswaran | Chaotic traveling rolls in Rayleigh-B\'enard convection | 9 pages. Revtex preprint format | null | null | null | nlin.CD astro-ph cond-mat.stat-mech physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate two-dimensional (2D) Rayleigh-B\'enard
convection using direct numerical simulation in Boussinesq fluids of Prandtl
number $P = 6.8$ confined between thermally conducting plates. We show through
the simulation that in a small range of reduced Rayleigh number $r$ ($770 < r <
890$) the 2D rolls move chaotically in a direction normal to the roll axis. The
lateral shift of the rolls may lead to global flow reversal of the convective
motion. The chaotic traveling rolls are observed in simulation with {\it
free-slip} as well as {\it no-slip} boundary conditions on the velocity field.
We show that the traveling rolls and the flow reversal are due to an interplay
between the real and imaginary parts of the critical modes.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 11:53:04 GMT"
},
{
"version": "v2",
"created": "Fri, 5 Dec 2008 17:31:13 GMT"
}
] | 2008-12-05T00:00:00 | [
[
"Pal",
"Supriyo",
""
],
[
"Kumar",
"Krishna",
""
],
[
"Verma",
"Mahendra K.",
""
],
[
"Carati",
"Daniele",
""
],
[
"De",
"Arnab K.",
""
],
[
"Eswaran",
"Vinayak",
""
]
] |
0704.3796 | Simon Chelkowski | Simon Chelkowski, Henning Vahlbruch, Karsten Danzmann, Roman Schnabel | Coherent control of broadband vacuum squeezing | 9 pages, 8 figures | PHYSICAL REVIEW A 75, 043814 (2007) | 10.1103/PhysRevA.75.043814 | null | quant-ph | null | We present the observation of optical fields carrying squeezed vacuum states
at sideband frequencies from 10Hz to above 35MHz. The field was generated with
type-I optical parametric oscillation below threshold at 1064nm. A coherent,
unbalanced classical modulation field at 40MHz enabled the generation of error
signals for stable phase control of the squeezed vacuum field with respect to a
strong local oscillator. Broadband squeezing of approximately -4dB was measured
with balanced homodyne detection. The spectrum of the squeezed field allows a
quantum noise reduction of ground-based gravitational wave detectors over their
full detection band, regardless of whether homodyne readout or radio-frequency
heterodyne readout is used.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 12:15:04 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chelkowski",
"Simon",
""
],
[
"Vahlbruch",
"Henning",
""
],
[
"Danzmann",
"Karsten",
""
],
[
"Schnabel",
"Roman",
""
]
] |
0704.3797 | Hennie Mastwijk | H.C. Mastwijk, P.V. Bartels, H.L.M. Lelieveld | The origin of the work function | 12 pages, 9 figures, updated with theoretical formalisms | null | null | null | cond-mat.str-el | null | In this paper we analyse the mechanisms responsible for the bonding of
electrons to metal surfaces. We present and validate a method to measure the
energy distribution of dense electron ensembles at ambient conditions. We have
found sharp structures in the energy distribution of charge confined at metal
surfaces. These structures correspond to the onset of space charge i.e.
electron emission. The threshold energy for emission increases linear with the
free electron density. We conclude that the work function is a direct measure
of the Hartree-Fock exchange energy. Remarkably, the emissions that have been
observed do not obey the Einstein-Millikan threshold relation for the photo
electric effect. By discrimination between requirements for energy and momentum
we deduce that electron emissions are trigged by photon momentum. We claim that
the photo electric effect is the result of a phase transition in an electron
gas that connects a surface bound, condensed state to a free continuum state.
The assignment of a phase transition to the effect under consideration is
justified by analyzing the behaviour of the Fermi-Dirac energy distribution
upon raising the Fermi level. We predict an abrupt increment in the number of
electrons in the continuum that exceeds 70 orders of magnitude. Both the
observed threshold energy and the line shape of the transition are in good
agreement with theoretical predictions.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 18:01:57 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Apr 2007 20:13:42 GMT"
},
{
"version": "v3",
"created": "Tue, 26 Jun 2007 09:21:15 GMT"
}
] | 2007-06-26T00:00:00 | [
[
"Mastwijk",
"H. C.",
""
],
[
"Bartels",
"P. V.",
""
],
[
"Lelieveld",
"H. L. M.",
""
]
] |
0704.3798 | Bence T\'oth | Bence Toth, Balint Toth, Janos Kertesz | Modeling the Epps effect of cross correlations in asset prices | to appear in the Proceedings of SPIE Fluctuations and Noise 2007 | Proc. SPIE, Vol. 6601, 66010J (2007) | 10.1117/12.727127 | null | q-fin.ST physics.data-an physics.soc-ph | null | We review the decomposition method of stock return cross-correlations,
presented previously for studying the dependence of the correlation coefficient
on the resolution of data (Epps effect). Through a toy model of random
walk/Brownian motion and memoryless renewal process (i.e. Poisson point
process) of observation times we show that in case of analytical treatability,
by decomposing the correlations we get the exact result for the frequency
dependence. We also demonstrate that our approach produces reasonable fitting
of the dependence of correlations on the data resolution in case of empirical
data. Our results indicate that the Epps phenomenon is a product of the finite
time decay of lagged correlations of high resolution data, which does not scale
with activity. The characteristic time is due to a human time scale, the time
needed to react to news.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 13:25:43 GMT"
}
] | 2009-01-11T00:00:00 | [
[
"Toth",
"Bence",
""
],
[
"Toth",
"Balint",
""
],
[
"Kertesz",
"Janos",
""
]
] |
0704.3799 | Shijing Gong | S.J. Gong and Z.Q. Yang | Spin filtering implemented through Rashba and weak magnetic modulations | 4 pages, 4 figures | null | 10.1063/1.2767373 | null | cond-mat.mes-hall | null | We present two theoretical schemes for spin filters in one-dimensional
semiconductor quantum wires with spatially modulated Rashba spin-orbit coupling
(SOC) as well as weak magnetic potential. For case I, the SOC is periodic and
the weak magnetic potential is applied uniformly along the wire. Full spin
polarizations with opposite signs are obtained within two separated energy
intervals. For case II, the weak magnetic potential is periodic while the SOC
is uniform. An ideal negative/positive switching effect for spin polarization
is realized by tuning the strength of SOC. The roles of SOC, magnetic
potential, and their coupling on the spin filtering are analyzed.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 13:30:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gong",
"S. J.",
""
],
[
"Yang",
"Z. Q.",
""
]
] |
0704.3800 | Neil Bevis | Neil Bevis, Mark Hindmarsh, Martin Kunz and Jon Urrestilla | CMB polarization power spectra contributions from a network of cosmic
strings | 12 pages, 5 figures. Minor re-phrasings. Matches final print version | Phys.Rev.D76:043005,2007 | 10.1103/PhysRevD.76.043005 | null | astro-ph hep-th | null | We present the first calculation of the possible (local) cosmic string
contribution to the cosmic microwave background polarization spectra from
simulations of a string network (rather than a stochastic collection of
unconnected string segments). We use field theory simulations of the Abelian
Higgs model to represent local U(1) strings, including their radiative decay
and microphysics. Relative to previous estimates, our calculations show a shift
in power to larger angular scales, making the chance of a future cosmic string
detection from the B-mode polarization slightly greater. We explore a future
ground-based polarization detector, taking the CLOVER project as our example.
In the null hypothesis (that cosmic strings make a zero contribution) we find
that CLOVER should limit the string tension \mu to G\mu<0.12e-6 (where G is the
gravitational constant), above which it is likely that a detection would be
possible.
| [
{
"version": "v1",
"created": "Sat, 28 Apr 2007 14:40:40 GMT"
},
{
"version": "v2",
"created": "Sun, 20 May 2007 09:47:30 GMT"
},
{
"version": "v3",
"created": "Tue, 28 Aug 2007 09:54:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bevis",
"Neil",
""
],
[
"Hindmarsh",
"Mark",
""
],
[
"Kunz",
"Martin",
""
],
[
"Urrestilla",
"Jon",
""
]
] |
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