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list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.4098 | Johannes Walcher | Johannes Walcher | Extended Holomorphic Anomaly and Loop Amplitudes in Open Topological
String | 56 pages, 6+ figures, v2,v3: refs added, v4: numerical predictions
retracted | null | 10.1016/j.nuclphysb.2009.02.006 | null | hep-th math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Open topological string amplitudes on compact Calabi-Yau threefolds are shown
to satisfy an extension of the holomorphic anomaly equation of Bershadsky,
Cecotti, Ooguri and Vafa. The total topological charge of the D-brane
configuration must vanish in order to satisfy tadpole cancellation. The
boundary state of such D-branes is holomorphically captured by a Hodge
theoretic normal function. Its Griffiths' infinitesimal invariant is the
analogue of the closed string Yukawa coupling and plays the role of the
terminator in a Feynman diagram expansion for the topological string with
D-branes. The holomorphic anomaly equation is solved and the holomorphic
ambiguity is fixed for some representative worldsheets of low genus and with
few boundaries on the real quintic.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 19:01:30 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 19:18:15 GMT"
},
{
"version": "v3",
"created": "Fri, 8 Jun 2007 14:50:48 GMT"
},
{
"version": "v4",
"created": "Wed, 4 Feb 2009 14:59:06 GMT"
}
] | 2010-04-05T00:00:00 | [
[
"Walcher",
"Johannes",
""
]
] |
0705.4099 | Eun-Ah Kim | Eun-Ah Kim, Michael J. Lawler, Paul Oreto, Subir Sachdev, Eduardo
Fradkin and Steven A. Kivelson | Theory of the nodal nematic quantum phase transition in superconductors | 9 page, 4 figures, an error in one of expressions corrected and a new
author was added. New references and footnotes are added and this is the
version to appear in PRB | Phys. Rev. B vol 77, 184514 (2008) | 10.1103/PhysRevB.77.184514 | null | cond-mat.supr-con cond-mat.str-el | null | We study the character of an Ising nematic quantum phase transition (QPT)
deep inside a d-wave superconducting state with nodal quasiparticles in a
two-dimensional tetragonal crystal. We find that, within a 1/N expansion, the
transition is continuous. To leading order in 1/N, quantum fluctuations enhance
the dispersion anisotropy of the nodal excitations, and cause strong scattering
which critically broadens the quasiparticle (qp) peaks in the spectral
function, except in a narrow wedge in momentum space near the Fermi surface
where the qp's remain sharp. We also consider the possible existence of a
nematic glass phase in the presence of weak disorder. Some possible
implications for cuprate physics are also discussed.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:02:07 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 23:39:10 GMT"
},
{
"version": "v3",
"created": "Wed, 21 May 2008 17:39:28 GMT"
}
] | 2008-05-23T00:00:00 | [
[
"Kim",
"Eun-Ah",
""
],
[
"Lawler",
"Michael J.",
""
],
[
"Oreto",
"Paul",
""
],
[
"Sachdev",
"Subir",
""
],
[
"Fradkin",
"Eduardo",
""
],
[
"Kivelson",
"Steven A.",
""
]
] |
0705.4100 | Diana Worrall | D.M. Worrall, M. Birkinshaw, R.A. Laing, W.D. Cotton, A.H. Bridle | The inner jet of radio galaxy NGC 315 as observed with Chandra and the
VLA | Accepted for publication in the MNRAS. 13 pages,14 figures (some in
colour) | null | 10.1111/j.1365-2966.2007.11998.x | null | astro-ph | null | We present Chandra X-ray results for the jet, nucleus, and gaseous atmosphere
of NGC 315, a nearby radio galaxy whose jet kinematics are known through deep
radio mapping. Diffuse X-ray synchrotron emission is detected from the jet out
to 30 arcsec from the nucleus, through regions both of fast bulk flow and
deceleration. The X-ray to radio flux ratio drops considerably where the flow
decelerates, but the X-ray and radio emissions show similar transverse extents
throughout, requiring distributed particle acceleration to maintain the supply
of X-ray-emitting electrons. A remarkable knotty filament within the jet is
seen in both the radio and X-ray, contributing roughly 10 per cent of the
diffuse emission along its extent at both wavelengths. No completely
satisfactory explanation for the filament is found, though its oscillatory
appearance, roughly aligned magnetic field, and requirements for particle
acceleration, suggest that it is a magnetic strand within a shear layer between
fast inner and slower outer flow.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:02:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Worrall",
"D. M.",
""
],
[
"Birkinshaw",
"M.",
""
],
[
"Laing",
"R. A.",
""
],
[
"Cotton",
"W. D.",
""
],
[
"Bridle",
"A. H.",
""
]
] |
0705.4101 | Antoinette Cowie | P. A. Price, A. Songaila, L. L. Cowie, J. Bell Burnell, E. Berger, A.
Cucchiara, D. B. Fox, I. Hook, S. R. Kulkarni, B. Penprase, K. C. Roth, B.
Schmidt | Properties of a Gamma Ray Burst Host Galaxy at z ~ 5 | Accepted for publication in ApJ Letters | Astrophys.J.663:L57-L60,2007 | 10.1086/520047 | null | astro-ph | null | We describe the properties of the host galaxy of the gamma-ray burst
GRB060510B based on a spectrum of the burst afterglow obtained with the Gemini
North 8m telescope. The galaxy lies at a redshift of z = 4.941 making it the
fourth highest spectroscopically identified burst host. However, it is the
second highest redshift galaxy for which the quality of the spectrum permits a
detailed metallicity analysis. The neutral hydrogen column density has a
logarithmic value of 21.0--21.2 cm^-2 and the weak metal lines of Ni, S and Fe
show that the metallicity is in excess of a tenth of solar which is far above
the metallicities in damped Lyman alpha absorbers at high redshift. The
tightest constraint is from the Fe lines which place [Fe/H] in excess of -0.8.
We argue that the results suggest that metallicity bias could be a serious
problem with inferring star formation from the GRB population and consider how
future higher quality measurements could be used to resolve this question.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:04:01 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Price",
"P. A.",
""
],
[
"Songaila",
"A.",
""
],
[
"Cowie",
"L. L.",
""
],
[
"Burnell",
"J. Bell",
""
],
[
"Berger",
"E.",
""
],
[
"Cucchiara",
"A.",
""
],
[
"Fox",
"D. B.",
""
],
[
"Hook",
"I.",
""
],
[
"Kulkarni",
"S. R.",
""
],
[
"Penprase",
"B.",
""
],
[
"Roth",
"K. C.",
""
],
[
"Schmidt",
"B.",
""
]
] |
0705.4102 | Eric Linder | Eric V. Linder | Resource Letter: Dark Energy and the Accelerating Universe | Resource Letter for AAPT/AJP, 11 pages, 99 references | Am.J.Phys.76:197-204,2008 | 10.1119/1.2805230 | null | astro-ph | null | This Resource Letter provides a guide to the literature on dark energy and
the accelerating universe. It is intended to be of use to researchers,
teachers, and students at several levels. Journal articles, books, and websites
are cited for the following topics: Einstein's cosmological constant,
quintessence or dynamical scalar fields, modified cosmic gravity, relations to
high energy physics, cosmological probes and observations, terrestrial probes,
calculational tools and parameter estimation, teaching strategies and
educational resources, and the fate of the universe.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:05:06 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Linder",
"Eric V.",
""
]
] |
0705.4103 | Tod R. Lauer | Tod R. Lauer, Scott Tremaine, Douglas Richstone, and S. M. Faber | Selection Bias in Observing the Cosmological Evolution of the Mbh-sigma
and Mbh-L Relationships | 28 pages, 6 figures, submitted to the Astrophysical Journal | null | 10.1086/522083 | null | astro-ph | null | Programs to observe evolution in the Mbh-sigma or Mbh-L relations typically
compare black-hole masses, Mbh, in high-redshift galaxies selected by nuclear
activity to Mbh in local galaxies selected by luminosity L, or stellar velocity
dispersion sigma. Because AGN luminosity is likely to depend on Mbh, selection
effects are different for high-redshift and local samples, potentially
producing a false signal of evolution. This bias arises because cosmic scatter
in the Mbh-sigma and Mbh-L relations means that the mean log(L) or log(sigma)
among galaxies that host a black hole of given Mbh, may be substantially
different than the log(L) or log(sigma) obtained from inverting the Mbh-L or
Mbh-sigma relations for the same nominal Mbh. The bias is particularly strong
at high Mbh, where the luminosity and dispersion functions of galaxies are
falling rapidly. The most massive black holes occur more often as rare outliers
in galaxies of modest mass than in the even rarer high-mass galaxies, which
would otherwise be the sole location of such black holes in the absence of
cosmic scatter. Because of this bias, Mbh will typically appear to be too large
in the distant sample for a given L or sigma. For the largest black holes and
the largest plausible cosmic scatter, the bias can reach a factor of 3 in Mbh
for the Mbh-sigma relation and a factor of 9 for the Mbh-L relation.
Unfortunately, the actual cosmic scatter is not known well enough to correct
for the bias. Measuring evolution of the Mbh and galaxy property relations
requires object selection to be precisely defined and exactly the same at all
redshifts.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:06:49 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Lauer",
"Tod R.",
""
],
[
"Tremaine",
"Scott",
""
],
[
"Richstone",
"Douglas",
""
],
[
"Faber",
"S. M.",
""
]
] |
0705.4104 | Gonzalo A. Palma | Gonzalo A. Palma (DESY) | On Newton's law in supersymmetric braneworld models | 30 pages, 1 figure | JHEP 0709:091,2007 | 10.1088/1126-6708/2007/09/091 | DESY 07-068 | hep-th gr-qc hep-ph | null | We study the propagation of gravitons within 5-D supersymmetric braneworld
models with a bulk scalar field. The setup considered here consists of a 5-D
bulk spacetime bounded by two 4-D branes localized at the fixed points of an
$S^1/Z_2$ orbifold. There is a scalar field $\phi$ in the bulk which, provided
a superpotential $W(\phi)$, determines the warped geometry of the 5-D
spacetime. This type of scenario is common in string theory, where the bulk
scalar field $\phi$ is related to the volume of small compact extra dimensions.
We show that, after the moduli are stabilized by supersymmetry breaking terms
localized on the branes, the only relevant degrees of freedom in the bulk
consist of a 5-D massive spectrum of gravitons. Then we analyze the
gravitational interaction between massive bodies localized at the positive
tension brane mediated by these bulk gravitons. It is shown that the Newtonian
potential describing this interaction picks up a non-trivial contribution at
short distances that depends on the shape of the superpotential $W(\phi)$. We
compute this contribution for dilatonic braneworld scenarios $W(\phi) =
e^{\alpha \phi}$ (where $\alpha$ is a constant) and discuss the particular case
of 5-D Heterotic M-theory: It is argued that a specific footprint at micron
scales could be observable in the near future.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:11:40 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Palma",
"Gonzalo A.",
"",
"DESY"
]
] |
0705.4105 | Dmitri Khveshchenko | D.V.Khveshchenko | Dirac fermions in a power-law-correlated random vector potential | Latex, 4+ pages | EPL, p.57008, v.82 (2008) | 10.1209/0295-5075/82/57008 | null | cond-mat.mes-hall | null | We study localization properties of two-dimensional Dirac fermions subject to
a power-law-correlated random vector potential describing, e.g., the effect of
"ripples" in graphene. By using a variety of techniques (low-order perturbation
theory, self-consistent Born approximation, replicas, and supersymmetry) we
make a case for a possible complete localization of all the electronic states
and compute the density of states.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:25:55 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Jun 2007 18:20:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Khveshchenko",
"D. V.",
""
]
] |
0705.4106 | Nicolas Rougemaille | N. Rougemaille (1,2), M. Portalupi (3,4), A. Brambilla (3), P.
Biagioni (3), A. Lanzara (1,4), M. Finazzi (3), A.K. Schmid (1), L. Du\`o (3)
((1) Lawrence Berkeley National Laboratory, Berkeley, California, USA, (2)
Institut N\'eel, CNRS & Universit\'e Joseph Fourier, Grenoble, France, (3)
L-NESS, Dipartimento di Fisica, Politecnico di Milano, Milano, Italy, (4)
Department of Physics, University of California Berkeley, Berkeley,
California, USA) | Exchange-induced frustration in Fe/NiO multilayers | 15 pages, 2 figures | Physical Review B 76, 214425 (2007) | 10.1103/PhysRevB.76.214425 | null | cond-mat.mtrl-sci | null | Using spin-polarized low-energy electron microscopy to study magnetization in
epitaxial layered systems, we found that the area vs perimeter relationship of
magnetic domains in the top Fe layers of Fe/NiO/Fe(100) structures follows a
power-law distribution, with very small magnetic domain cutoff radius (about 40
nm) and domain wall thickness. This unusual magnetic microstructure can be
understood as resulting from the competition between antiferromagnetic and
ferromagnetic exchange interactions at the Fe/NiO interfaces, rather than from
mechanisms involving the anisotropy and dipolar forces that govern length
scales in conventional magnetic domain structures. Statistical analysis of our
measurements validates a micromagnetic model that accounts for this interfacial
exchange coupling.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:28:45 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jan 2008 17:29:29 GMT"
}
] | 2008-01-08T00:00:00 | [
[
"Rougemaille",
"N.",
""
],
[
"Portalupi",
"M.",
""
],
[
"Brambilla",
"A.",
""
],
[
"Biagioni",
"P.",
""
],
[
"Lanzara",
"A.",
""
],
[
"Finazzi",
"M.",
""
],
[
"Schmid",
"A. K.",
""
],
[
"Duò",
"L.",
""
]
] |
0705.4107 | Rodrigo Ferreira Sobreiro | R. F. Sobreiro | Non-perturbative aspects of Yang-Mills theories | PhD thesis; Advisor: S. P. Sorella; 136 pages; Text in Portuguese (To
be replaced by an English version as soon as possible) | null | null | null | hep-th | null | Some nonperturbative aspects of Euclidean Yang-Mills theories in four
dimensions, quantized in the Landau gauge, are analytically studied. In
particular, we investigate the dynamical mass generation for the gluons due to
the presence of dimension two condensates. This study is performed in the
framework of the local composite operator technique in the case of the
Yang-Mills action as well as in the case of the Gribov-Zwanziger action.
Further, an investigation of the Gribov ambiguities in the linear covariant
gauges is presented.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 21:38:04 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Sobreiro",
"R. F.",
""
]
] |
0705.4108 | Artyom Yurov | Artyom V. Yurov, Artyom V. Astashenok, Pedro F. Gonzalez-Diaz | Astronomical bounds on future big freeze singularity | 8 pages | Grav.Cosmol.14:205-212,2008 | 10.1134/S0202289308030018 | null | astro-ph | null | Recently it was found that dark energy in the form of phantom generalized
Chaplygin gas may lead to a new form of the cosmic doomsday, the big freeze
singularity. Like the big rip singularity, the big freeze singularity would
also take place at a finite future cosmic time, but unlike the big rip
singularity it happens for a finite scale factor.Our goal is to test if a
universe filled with phantom generalized Chaplygin gas can conform to the data
of astronomical observations. We shall see that if the universe is only filled
with generalized phantom Chaplygin gas with equation of state
$p=-c^2s^2/\rho^{\alpha}$ with $\alpha<-1$, then such a model cannot be matched
to the data of astronomical observations. To construct matched models one
actually need to add dark matter. This procedure results in cosmological
scenarios which do not contradict the data of astronomical observations and
allows one to estimate how long we are now from the future big freeze doomsday.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:35:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yurov",
"Artyom V.",
""
],
[
"Astashenok",
"Artyom V.",
""
],
[
"Gonzalez-Diaz",
"Pedro F.",
""
]
] |
0705.4109 | Maarten Baes | M. Baes and E. Van Hese | Dynamical models with a general anisotropy profile | 18 pages, accepted for publication in A&A | null | 10.1051/0004-6361:20077672 | null | astro-ph | null | Both numerical simulations and observational evidence indicate that the outer
regions of galaxies and dark matter haloes are typically mildly to
significantly radially anisotropic. The inner regions can be significantly
non-isotropic, depending on the dynamical formation and evolution processes. In
an attempt to break the lack of simple dynamical models that can reproduce this
behaviour, we explore a technique to construct dynamical models with an
arbitrary density and an arbitrary anisotropy profile. We outline a general
construction method and propose a more practical approach based on a
parameterized anisotropy profile. This approach consists of fitting the density
of the model with a set of dynamical components, each of which have the same
anisotropy profile. Using this approach we avoid the delicate fine-tuning
difficulties other fitting techniques typically encounter when constructing
radially anisotropic models. We present a model anisotropy profile that
generalizes the Osipkov-Merritt profile, and that can represent any smooth
monotonic anisotropy profile. Based on this model anisotropy profile, we
construct a very general seven-parameter set of dynamical components for which
the most important dynamical properties can be calculated analytically. We use
the results to look for simple one-component dynamical models that generate
simple potential-density pairs while still supporting a flexible anisotropy
profile. We present families of Plummer and Hernquist models in which the
anisotropy at small and large radii can be chosen as free parameters. We also
generalize these two families to a three-parameter family that
self-consistently generates the set of Veltmann potential-density pairs.
(Abridged...)
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 20:48:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Baes",
"M.",
""
],
[
"Van Hese",
"E.",
""
]
] |
0705.4110 | Ian Kash | Ian A. Kash, Eric J. Friedman, Joseph Y. Halpern | Optimizing Scrip Systems: Efficiency, Crashes, Hoarders, and Altruists | null | null | null | null | cs.GT | null | We discuss the design of efficient scrip systems and develop tools for
empirically analyzing them. For those interested in the empirical study of
scrip systems, we demonstrate how characteristics of agents in a system can be
inferred from the equilibrium distribution of money. From the perspective of a
system designer, we examine the effect of the money supply on social welfare
and show that social welfare is maximized by increasing the money supply up to
the point that the system experiences a ``monetary crash,'' where money is
sufficiently devalued that no agent is willing to perform a service. We also
examine the implications of the presence of altruists and hoarders on the
performance of the system. While a small number of altruists may improve social
welfare, too many can also cause the system to experience a monetary crash,
which may be bad for social welfare. Hoarders generally decrease social welfare
but, surprisingly, they also promote system stability by helping prevent
monetary crashes. In addition, we provide new technical tools for analyzing and
computing equilibria by showing that our model exhibits strategic
complementarities, which implies that there exist equilibria in pure strategies
that can be computed efficiently.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 21:14:04 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Kash",
"Ian A.",
""
],
[
"Friedman",
"Eric J.",
""
],
[
"Halpern",
"Joseph Y.",
""
]
] |
0705.4111 | Weiyong He | Weiyong He | Remarks on the existence of bilaterally symmetric extremal K\"ahler
metrics on $\mathbb{CP}^2\sharp 2\bar{\mathbb{CP}^2}$ | A modified version | null | null | null | math.DG | null | In this short note we show that the existence of bilaterally symmetric
extremal K\"ahler metrics on $\mathbb{CP}^2\sharp 2\bar{\mathbb{CP}^2}$.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 21:26:05 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 05:36:55 GMT"
},
{
"version": "v3",
"created": "Thu, 7 Jun 2007 03:14:35 GMT"
}
] | 2007-06-07T00:00:00 | [
[
"He",
"Weiyong",
""
]
] |
0705.4112 | Rogerio Rosenfeld | T. S. Biro and R. Rosenfeld | Microscopic Origin of Non-Gaussian Distributions of Financial Returns | 13 pages, 4 figures. Several clarifying comments, new references and
acknowledgments added | null | 10.1016/j.physa.2007.10.067 | null | q-fin.ST cond-mat.other physics.soc-ph | null | In this paper we study the possible microscopic origin of heavy-tailed
probability density distributions for the price variation of financial
instruments. We extend the standard log-normal process to include another
random component in the so-called stochastic volatility models. We study these
models under an assumption, akin to the Born-Oppenheimer approximation, in
which the volatility has already relaxed to its equilibrium distribution and
acts as a background to the evolution of the price process. In this
approximation, we show that all models of stochastic volatility should exhibit
a scaling relation in the time lag of zero-drift modified log-returns. We
verify that the Dow-Jones Industrial Average index indeed follows this scaling.
We then focus on two popular stochastic volatility models, the Heston and
Hull-White models. In particular, we show that in the Hull-White model the
resulting probability distribution of log-returns in this approximation
corresponds to the Tsallis (t-Student) distribution. The Tsallis parameters are
given in terms of the microscopic stochastic volatility model. Finally, we show
that the log-returns for 30 years Dow Jones index data is well fitted by a
Tsallis distribution, obtaining the relevant parameters.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:16:42 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jul 2007 12:12:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Biro",
"T. S.",
""
],
[
"Rosenfeld",
"R.",
""
]
] |
0705.4113 | Scott C. Chapman | S. C. Chapman, J. Penarrubia, R. Ibata, A. McConnachie, N. Martin, M.
Irwin, A. Blain, G. F. Lewis, B. Letarte, K. Lo, A. Ludlow, K. O'neil | Strangers in the night: Discovery of a dwarf spheroidal galaxy on its
first Local Group infall | 4 pages 5 figures 1 table, accepted in ApJ, july issue | null | 10.1086/519377 | null | astro-ph | null | We present spectroscopic observations of the AndXII dwarf spheroidal galaxy
using DEIMOS/Keck-II, showing it to be moving rapidly through the Local Group
(-556 km/s heliocentric velocity, -281 km/s relative to Andromeda from the MW),
falling into the Local Group from ~115 kpc beyond Andromeda's nucleus. AndXII
therefore represents a dwarf galaxy plausibly falling into the Local Group for
the first time, and never having experienced a dense galactic environment. From
Green Bank Telescope observations, a limit on the H{I} gas mass of <3000 Msun
suggests that AndXII's gas could have been removed prior to experiencing the
tides of the Local Group galaxies. Orbit models suggest the dwarf is close to
the escape velocity of M31 for published mass models. AndXII is our best direct
evidence for the late infall of satellite galaxies, a prediction of
cosmological simulations.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 22:26:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chapman",
"S. C.",
""
],
[
"Penarrubia",
"J.",
""
],
[
"Ibata",
"R.",
""
],
[
"McConnachie",
"A.",
""
],
[
"Martin",
"N.",
""
],
[
"Irwin",
"M.",
""
],
[
"Blain",
"A.",
""
],
[
"Lewis",
"G. F.",
""
],
[
"Letarte",
"B.",
""
],
[
"Lo",
"K.",
""
],
[
"Ludlow",
"A.",
""
],
[
"O'neil",
"K.",
""
]
] |
0705.4114 | Svetlana Varchenko | E.Mukhin, V.Tarasov and A.Varchenko | Bethe algebra and algebra of functions on the space of differential
operators of order two with polynomial solutions | null | null | null | null | math.QA math.AG math.CA | null | We show that the following two algebras are isomorphic. The first is the
algebra $A_P$ of functions on the scheme of monic linear second-order
differential operators on $\C$ with prescribed regular singular points at
$z_1,..., z_n, \infty$, prescribed exponents $\La^{(1)}, ..., \La^{(n)},
\La^{(\infty)}$ at the singular points, and having the kernel consisting of
polynomials only. The second is the Bethe algebra of commuting linear
operators, acting on the vector space $\Sing L_{\La^{(1)}} \otimes ... \otimes
L_{\La^{(n)}}[\La^{(\infty)}]$ of singular vectors of weight $\La^{(\infty)}$
in the tensor product of finite dimensional polynomial $gl_2$-modules with
highest weights $\La^{(1)},..., \La^{(n)}$.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 22:05:09 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Mukhin",
"E.",
""
],
[
"Tarasov",
"V.",
""
],
[
"Varchenko",
"A.",
""
]
] |
0705.4115 | Hilmar Forkel | Hilmar Forkel, Michael Beyer and Tobias Frederico | Linear meson and baryon trajectories in AdS/QCD | 4 pages | Int.J.Mod.Phys.E16:2794-2797,2007 | 10.1142/S0218301307008422 | null | hep-ph | null | An approximate holographic dual of QCD is constructed and shown to reproduce
the empirical linear trajectories of universal slope on which the square masses
of radially and orbitally excited hadrons join. Conformal symmetry breaking and
other IR effects are described exclusively by deformations of the anti-de
Sitter background metric. The predictions for the light hadron spectrum include
new relations between ground state masses and trajectory slopes and are in good
overall agreement with experimental data.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 22:05:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Forkel",
"Hilmar",
""
],
[
"Beyer",
"Michael",
""
],
[
"Frederico",
"Tobias",
""
]
] |
0705.4116 | Firas Rassoul-Agha | Firas Rassoul-Agha and Timo Seppalainen | Almost sure functional central limit theorem for ballistic random walk
in random environment | Accepted to the Annales de l'Institut Henri Poincare | Ann. Inst. H. Poincare Probab. Statist. 45 (2009) No. 2, 373-420 | 10.1214/08-AIHP167 | null | math.PR | null | We consider a multidimensional random walk in a product random environment
with bounded steps, transience in some spatial direction, and high enough
moments on the regeneration time. We prove an invariance principle, or
functional central limit theorem, under almost every environment for the
diffusively scaled centered walk. The main point behind the invariance
principle is that the quenched mean of the walk behaves subdiffusively.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 04:37:12 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jul 2007 17:39:21 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Feb 2008 19:03:21 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Rassoul-Agha",
"Firas",
""
],
[
"Seppalainen",
"Timo",
""
]
] |
0705.4117 | Juan Antonio Aguilar-Saavedra | F. del Aguila, J. A. Aguilar-Saavedra | Like-sign dilepton signals from a leptophobic Z' boson | 19 pages, 11 PS figures. Paper significantly enlarged to include
analysis for LHC | JHEP 0711:072,2007 | 10.1088/1126-6708/2007/11/072 | null | hep-ph | null | A new leptophobic neutral gauge boson Z' with small mixing to the Z can have
a mass as light as M_Z' ~ 350 GeV, and still have escaped detection at LEP and
Tevatron. Such a Z' boson can be derived from E6 and, if the new heavy neutrino
singlets in the 27 representation are lighter than M_Z'/2, the process p
p(pbar) -> Z' -> NN -> l+- l+- X is observable. Indeed, this new signal could
explain the small excess of like-sign dileptons found at Tevatron. Implications
for LHC are also discussed. In particular, the Tevatron excess could be
confirmed with less than 1 fb-1, and leptophobic Z' masses up to 2.5 TeV can be
probed with 30 fb-1.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 18:22:06 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 10:05:38 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"del Aguila",
"F.",
""
],
[
"Aguilar-Saavedra",
"J. A.",
""
]
] |
0705.4118 | Hendrik Bluhm | Hendrik Bluhm | Magnetic fields above the surface of a superconductor with internal
magnetism | 8 pages, 2 figures. Journal version. Added one figure, some
discussion. A few typos corrected | Phys. Rev. B 76, 144507 (2007) | 10.1103/PhysRevB.76.144507 | null | cond-mat.supr-con | null | The author presents a method for calculating the magnetic fields near a
planar surface of a superconductor with a given intrinsic magnetization in the
London limit. He computes solutions for various magnetic domain boundary
configurations and derives relations between the spectral densities of the
magnetization and the resulting field in the vacuum half space, which are
useful if the magnetization can be considered as a statistical quantity and its
features are too small to be resolved individually. The results are useful for
analyzing and designing magnetic scanning experiments. Application to existing
data from such experiments on Sr$_2$RuO$_4$ show that a domain wall would have
been detectable, but the magnetic field of randomly oriented small domains and
small defects may have been smaller than the experimental noise level.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 22:17:09 GMT"
},
{
"version": "v2",
"created": "Sun, 7 Oct 2007 04:02:14 GMT"
}
] | 2009-07-06T00:00:00 | [
[
"Bluhm",
"Hendrik",
""
]
] |
0705.4119 | Michael Henry | Michael K. Henry, Chandrasekhar Ramanathan, Jonathan S. Hodges, Colm
A. Ryan, Michael J. Ditty, Raymond Laflamme, David G. Cory | Fidelity enhancement by logical qubit encoding | 10 pages, 2 figures | null | 10.1103/PhysRevLett.99.220501 | null | quant-ph | null | We demonstrate coherent control of two logical qubits encoded in a
decoherence free subspace (DFS) of four dipolar-coupled protons in an NMR
quantum information processor. A pseudo-pure fiducial state is created in the
DFS, and a unitary logical qubit entangling operator evolves the system to a
logical Bell state. The four-spin molecule is partially aligned by a liquid
crystal solvent, which introduces strong dipolar couplings among the spins.
Although the system Hamiltonian is never fully specified, we demonstrate high
fidelity control over the logical degrees of freedom. In fact, the DFS encoding
leads to higher fidelity control than is available in the full four-spin
Hilbert space.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 22:27:23 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Oct 2007 02:08:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Henry",
"Michael K.",
""
],
[
"Ramanathan",
"Chandrasekhar",
""
],
[
"Hodges",
"Jonathan S.",
""
],
[
"Ryan",
"Colm A.",
""
],
[
"Ditty",
"Michael J.",
""
],
[
"Laflamme",
"Raymond",
""
],
[
"Cory",
"David G.",
""
]
] |
0705.4120 | Carlos A. S. Almeida | M. O. Tahim, R. R. Landim, and C. A. S. Almeida | Spacetime as a deformable solid | 5 pages, RevTex4 | null | null | null | gr-qc hep-th | null | In this letter we discuss the possibility of treating the spacetime by itself
as a kind of deformable body for which we can define an fundamental lattice,
just like atoms in crystal lattices. We show three signs pointing in that
direction. We simulate the spacetime manifold by a very specific congruence of
curves and use the Landau-Raychadhuri equation to study the behavior of such a
congruence. The lattice appears because we are forced to associate to each
curve of the congruence a sort of fundamental "particle". The world-lines of
these particles should be identified with the congruence fulfilling the
spacetime manifold. The conclusion is that when describing the deformations of
the spacetime the Einstein equations emerge and the spacetime metric should be
treated as a secondary (not fundamental) object of the theory.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 22:33:16 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Tahim",
"M. O.",
""
],
[
"Landim",
"R. R.",
""
],
[
"Almeida",
"C. A. S.",
""
]
] |
0705.4121 | Alfredo Sandoval-Villalbazo | A. Sandoval-Villalbazo and A.L. Garcia-Perciante | Gravitational instability of a dilute fully ionized gas in the presence
of the Dufour effect | 8 pages, 2 figures | Gen.Rel.Grav.39:2017-2024,2007 | 10.1007/s10714-007-0498-z | null | astro-ph | null | The gravitational instability of a fully ionized gas is analyzed within the
framework of linear irreversible thermodynamics. In particular, the presence of
a heat flux corresponding to generalized thermodynamic forces is shown to
affect the properties of the dispersion relation governing the stability of
this kind of system in certain problems of interest.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 22:46:52 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Sandoval-Villalbazo",
"A.",
""
],
[
"Garcia-Perciante",
"A. L.",
""
]
] |
0705.4122 | Lior Silberman | Ben Elias, Lior Silberman and Ramin Takloo-Bighash | Finding Minimal Permutation Representations of Finite Groups | Corrected version; 12 pages | Experim. Math. v.19 (2010) no.1, 121-128 | null | null | math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A minimal permutation representation of a finite group G is a faithful G-set
with the smallest possible size. We study the structure of such representations
and show that for certain groups they may be obtained by a greedy construction.
In these situations (except when central involutions intervene) all minimal
permutation representations have the same set of orbit sizes. Using the same
ideas we also show that if the size d(G) of a minimal faithful G-set is at
least c|G| for some c>0 then d(G) = |G|/m + O(1) for an integer m, with the
implied constant depending on c.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 23:08:25 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Sep 2007 18:54:17 GMT"
},
{
"version": "v3",
"created": "Wed, 24 Jul 2013 15:51:13 GMT"
}
] | 2013-07-25T00:00:00 | [
[
"Elias",
"Ben",
""
],
[
"Silberman",
"Lior",
""
],
[
"Takloo-Bighash",
"Ramin",
""
]
] |
0705.4123 | Semen Kutateladze S | S.S. Kutateladze | The Call of Mathematics | A draft of a talk at the conference "Mathematics in the Modern
World," Novosibirisk, September 17-23, 2007 | null | null | null | math.GM math.HO | null | A few remarks on how mathematics quests for freedom.
| [
{
"version": "v1",
"created": "Mon, 28 May 2007 23:43:48 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Kutateladze",
"S. S.",
""
]
] |
0705.4124 | Semen Kutateladze S | S.S. Kutateladze | Interaction of Order and Convexity | Prepared for the Russian--German geometry meeting dedicated to the
95th anniversary of A. D. Alexandrov (1912--1999), St. Petersburg, June
18--23, 2007 | J.Appl. Indust. Math., 2007, V.1, No.4, 399-405 | null | null | math.FA math.MG | null | This is an overview of merging the techniques of Riesz space theory and
convex geometry.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 00:25:03 GMT"
}
] | 2011-05-31T00:00:00 | [
[
"Kutateladze",
"S. S.",
""
]
] |
0705.4125 | Nandor Simanyi | N. Chernov, N. Simanyi | Upgrading the Local Ergodic Theorem for planar semi-dispersing billiards | 17 pages, 2 figures | J. Stat. Phys. Vol. 139. No. 3 (2010), 355-366 | 10.1007/s10955-010-9927-6 | null | math.DS math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Local Ergodic Theorem (also known as the `Fundamental Theorem') gives
sufficient conditions under which a phase point has an open neighborhood that
belongs (mod 0) to one ergodic component. This theorem is a key ingredient of
many proofs of ergodicity for billiards and, more generally, for smooth
hyperbolic maps with singularities. However the proof of that theorem relies
upon a delicate assumption (Chernov-Sinai Ansatz), which is difficult to check
for some physically relevant models, including gases of hard balls. Here we
give a proof of the Local Ergodic Theorem for two dimensional billiards without
using the Ansatz.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 01:06:06 GMT"
},
{
"version": "v2",
"created": "Sun, 10 May 2009 05:14:05 GMT"
},
{
"version": "v3",
"created": "Thu, 4 Jun 2009 22:47:52 GMT"
}
] | 2010-08-12T00:00:00 | [
[
"Chernov",
"N.",
""
],
[
"Simanyi",
"N.",
""
]
] |
0705.4126 | Saharon Shelah's Office | Saharon Shelah | EF equivalent not isomorphic models | null | null | null | Shelah [Sh:907] | math.LO | null | We construct non-isomorphic models M, N, e.g. of cardinality aleph_1 such
that in the Ehrenfeucht-Fraisse game of length zeta < omega_1 the isomorphism
player wins
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 01:35:20 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 19:22:11 GMT"
}
] | 2007-09-25T00:00:00 | [
[
"Shelah",
"Saharon",
""
]
] |
0705.4127 | Jiang Yunfeng | Yunfeng Jiang | The Automorphism Group of Toric Deligne-Mumford Stacks | 12 pages | null | null | null | math.AG | null | We prove that the automorphism group of a toric Deligne-Mumford stack is
isomorphic to the $2$-group associated to the stacky fan.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 19:58:47 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Jiang",
"Yunfeng",
""
]
] |
0705.4128 | Rodney Van Meter | Rodney Van Meter, Thaddeus D. Ladd, W.J. Munro, Kae Nemoto | System Design for a Long-Line Quantum Repeater | 12 pages, 13 figures. v2 includes one new graph, modest corrections
to some others, and significantly improved presentation. to appear in
IEEE/ACM Transactions on Networking | IEEE/ACM Transactions on Networking 17(3), 1002-1013, 2009 | 10.1109/TNET.2008.927260 | null | quant-ph | null | We present a new control algorithm and system design for a network of quantum
repeaters, and outline the end-to-end protocol architecture. Such a network
will create long-distance quantum states, supporting quantum key distribution
as well as distributed quantum computation. Quantum repeaters improve the
reduction of quantum-communication throughput with distance from exponential to
polynomial. Because a quantum state cannot be copied, a quantum repeater is not
a signal amplifier, but rather executes algorithms for quantum teleportation in
conjunction with a specialized type of quantum error correction called
purification to raise the fidelity of the quantum states. We introduce our
banded purification scheme, which is especially effective when the fidelity of
coupled qubits is low, improving the prospects for experimental realization of
such systems. The resulting throughput is calculated via detailed simulations
of a long line composed of shorter hops. Our algorithmic improvements increase
throughput by a factor of up to fifty compared to earlier approaches, for a
broad range of physical characteristics.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 02:02:15 GMT"
},
{
"version": "v2",
"created": "Wed, 7 May 2008 02:22:13 GMT"
}
] | 2009-09-01T00:00:00 | [
[
"Van Meter",
"Rodney",
""
],
[
"Ladd",
"Thaddeus D.",
""
],
[
"Munro",
"W. J.",
""
],
[
"Nemoto",
"Kae",
""
]
] |
0705.4129 | Waseem Kamleh | Waseem Kamleh, Patrick O. Bowman, Derek B. Leinweber, Anthony G.
Williams, and Jianbo Zhang | Unquenching effects in the quark and gluon propagator | 10 pages, 7 figures | Phys.Rev.D76:094501,2007 | 10.1103/PhysRevD.76.094501 | ADP-07-06/T646 | hep-lat | null | In this work we examine the Fat-Link Irrelevant Clover (FLIC) overlap quark
propagator and the gluon propagator on both dynamical and quenched lattices.
The tadpole-improved Luscher-Weisz gauge action is used in both cases. The
dynamical gauge fields use the FLIC fermion action for the sea quark
contribution. We observe that the presence of sea quarks causes a suppression
of the mass function, quark renormalization function and gluon dressing
function in the infrared. The ultraviolet physics is unaffected.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 01:55:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kamleh",
"Waseem",
""
],
[
"Bowman",
"Patrick O.",
""
],
[
"Leinweber",
"Derek B.",
""
],
[
"Williams",
"Anthony G.",
""
],
[
"Zhang",
"Jianbo",
""
]
] |
0705.4130 | Saharon Shelah's Office | Saharon Shelah | On long increasing chains modulo flat ideals | null | null | null | Shelah [Sh:908] | math.LO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that e.g. there is no omega_4-sequence in (omega_3)^{omega_3}
increasing modulo the ideal of countable sets.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 02:01:43 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Aug 2008 16:07:50 GMT"
},
{
"version": "v3",
"created": "Tue, 15 Jun 2010 05:18:35 GMT"
}
] | 2010-06-16T00:00:00 | [
[
"Shelah",
"Saharon",
""
]
] |
0705.4131 | Saharon Shelah's Office | Saharon Shelah | No limit model in inaccessible | null | null | null | Shelah [Sh:906] | math.LO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our aim is to improve the negative results i.e. non-existence of limit
models, and the failure of the generic pair property from math.LO/0609636 to
inaccessible lambda as promised there. The motivation is that in [Sh:F756] the
positive results are for lambda measurable hence inaccessible, whereas in
math.LO/0609636 in the negative results obtained only on non-strong limit
cardinals.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 02:15:17 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Sep 2010 03:23:36 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Jan 2011 03:06:28 GMT"
}
] | 2011-01-06T00:00:00 | [
[
"Shelah",
"Saharon",
""
]
] |
0705.4132 | Saharon Shelah's Office | Gershon Sageev and Saharon Shelah | Noetherian ring with free additive groups | null | Abstracts Amer. Math. Soc. 7 (1986) 369 | null | Shelah [SgSh:217] | math.LO | null | There are Noetherian rings (in fact domains) with a free additive group, in
every infinite cardinality.
(This is an expanded version of [SgSh:217] which appears in the Abstracts of
the American Mathematical Society 7 (1986): 369.)
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 02:41:48 GMT"
}
] | 2022-08-22T00:00:00 | [
[
"Sageev",
"Gershon",
""
],
[
"Shelah",
"Saharon",
""
]
] |
0705.4133 | Roberto Casini | R. Casini and R. Manso Sainz | Scattering polarization of hydrogen lines from electric-induced atomic
alignment | 10 pages, 4 figures. Accepted by J.Phys.B: At.Mol.Opt.Phys | J. Phys. B: At. Mol. Opt. Phys. 41 (2008) 085702 | 10.1088/0953-4075/41/8/085702 | null | quant-ph physics.atom-ph | null | We consider a gas of hydrogen atoms illuminated by a broadband, unpolarized
radiation with zero anisotropy. In the absence of external fields, the atomic
J-levels are thus isotropically populated. While this condition persists in the
presence of a magnetic field, we show instead that electric fields can induce
the alignment of those levels. We also show that this electric alignment cannot
occur in a two-term model of hydrogen (e.g., if only the Ly-alpha transition is
excited), or if the level populations are distributed according to Boltzmann's
law.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 02:57:49 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Mar 2008 17:15:27 GMT"
}
] | 2008-11-05T00:00:00 | [
[
"Casini",
"R.",
""
],
[
"Sainz",
"R. Manso",
""
]
] |
0705.4134 | Michael Vielhaber | Michael Vielhaber and Monica del Pilar Canales | The Battery-Discharge-Model: A Class of Stochastic Finite Automata to
Simulate Multidimensional Continued Fraction Expansion | 12 pages | null | null | null | cs.IT cs.CC cs.CR math.IT | null | We define an infinite stochastic state machine, the Battery-Discharge-Model
(BDM), which simulates the behaviour of linear and jump complexity of the
continued fraction expansion of multidimensional formal power series, a
relevant security measure in the cryptanalysis of stream ciphers.
We also obtain finite approximations to the infinite BDM, where polynomially
many states suffice to approximate with an exponentially small error the
probabilities and averages for linear and jump complexity of M-multisequences
of length n over the finite field F_q, for any M, n, q.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 02:50:42 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Vielhaber",
"Michael",
""
],
[
"Canales",
"Monica del Pilar",
""
]
] |
0705.4135 | Craig M. Savage | C.M. Savage and K.V. Kheruntsyan | Spatial pair correlations of atoms in molecular dissociation | Final published version | Phys. Rev. Lett. 99, 220404 (2007) | 10.1103/PhysRevLett.99.220404 | null | cond-mat.other | null | We perform first-principles quantum simulations of dissociation of trapped,
spatially inhomogeneous Bose-Einstein condensates of molecular dimers.
Specifically, we study spatial pair correlations of atoms produced in
dissociation after time of flight. We find that the observable correlations may
significantly degrade in systems with spatial inhomogeneity compared to the
predictions of idealized uniform models. We show how binning of the signal can
enhance the detectable correlations and lead to the violation of the classical
Cauchy-Schwartz inequality and relative number squeezing.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 02:52:48 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Nov 2007 01:55:24 GMT"
}
] | 2007-11-28T00:00:00 | [
[
"Savage",
"C. M.",
""
],
[
"Kheruntsyan",
"K. V.",
""
]
] |
0705.4136 | Juan Carlos Campuzano | U. Chatterjee, M. Shi, A. Kaminski, A. Kanigel, H. M. Fretwell, K.
Terashima, T. Takahashi, S. Rosenkranz, Z. Z. Li, H. Raffy, A.
Santander-Syro, K. Kadowaki, M. Randeria, M. R. Norman, J. C. Campuzano | Anomalous dispersion in the autocorrelation of ARPES data of
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ | 5 pages, 4 figures | Phys Rev B 76, 012504 (2007) | 10.1103/PhysRevB.76.012504 | null | cond-mat.supr-con | null | We find that peaks in the autocorrelation of angle resolved photoemission
spectroscopy data of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ in the superconducting
state show dispersive behavior for binding energies smaller than the maximum
superconducting energy gap. For higher energies, though, a striking anomalous
dispersion is observed that is a consequence of the interaction of the
electrons with collective excitations. In contrast, in the pseudogap phase, we
only observe dispersionless behavior for the autocorrelation peaks. The
implications of our findings in regards to Fourier transformed scanning
tunneling spectroscopy data are discussed.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 16:53:49 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Chatterjee",
"U.",
""
],
[
"Shi",
"M.",
""
],
[
"Kaminski",
"A.",
""
],
[
"Kanigel",
"A.",
""
],
[
"Fretwell",
"H. M.",
""
],
[
"Terashima",
"K.",
""
],
[
"Takahashi",
"T.",
""
],
[
"Rosenkranz",
"S.",
""
],
[
"Li",
"Z. Z.",
""
],
[
"Raffy",
"H.",
""
],
[
"Santander-Syro",
"A.",
""
],
[
"Kadowaki",
"K.",
""
],
[
"Randeria",
"M.",
""
],
[
"Norman",
"M. R.",
""
],
[
"Campuzano",
"J. C.",
""
]
] |
0705.4137 | Saharon Shelah's Office | Saharon Shelah | Abstract elementary classes near aleph_1 | null | null | null | Shelah [Sh:88r] | math.LO | null | We prove in ZFC, no psi in L_{omega_1,omega}[Q] have unique model of
uncountable cardinality, this confirms theBaldwin conjecture. But we analyze
this in more general terms. We introduce and investigate a.e.c. and also
versions of limit models, and prove some basic properties like representation
by PC class, for any a.e.c. For PC_{aleph_0}-representable a.e.c. we
investigate the conclusion of having not too many non-isomorphic models in
aleph_1 and aleph_2, but have to assume 2^{aleph_0}<2^{aleph_1} and even
2^{aleph_1}<2^{aleph_2}.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 03:24:46 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Shelah",
"Saharon",
""
]
] |
0705.4138 | Michael Vielhaber | Michael Vielhaber and Monica del Pilar Canales | The Asymptotic Normalized Linear Complexity of Multisequences | 19 pages, 2 figures, submitted to J. Complexity | null | null | null | cs.IT cs.CC cs.CR math.IT | null | We show that the asymptotic linear complexity of a multisequence a in
F_q^\infty that is I := liminf L_a(n)/n and S := limsup L_a(n)/n satisfy the
inequalities M/(M+1) <= S <= 1 and M(1-S) <= I <= 1-S/M, if all M sequences
have nonzero discrepancy infinitely often, and all pairs (I,S) satisfying these
conditions are met by 2^{\aleph_0} multisequences a.
This answers an Open Problem by Dai, Imamura, and Yang.
Keywords: Linear complexity, multisequence, Battery Discharge Model,
isometry.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 03:41:21 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Vielhaber",
"Michael",
""
],
[
"Canales",
"Monica del Pilar",
""
]
] |
0705.4139 | R. Brent Tully | R. Brent Tully, Edward J. Shaya, Igor D. Karachentsev, Helene M.
Courtois, Dale D. Kocevski, Luca Rizzi, and Alan Peel | Our Peculiar Motion Away from the Local Void | Tentatively scheduled for Astrophysical Journal, 676 (March 20),
2008. 18 figures, 3 tables including web link for 2 tables, web links to 2
videos | Astrophys.J.676:184-205,2008 | 10.1086/527428 | null | astro-ph astro-ph.CO | null | The peculiar velocity of the Local Group of galaxies manifested in the Cosmic
Microwave Background dipole is found to decompose into three dominant
components. The three components are clearly separated because they arise on
distinct spatial scales and are fortuitously almost orthogonal in their
influences. The nearest, which is distinguished by a velocity discontinuity at
~7 Mpc, arises from the evacuation of the Local Void. We lie in the Local Sheet
that bounds the void. Random motions within the Local Sheet are small. Our
Galaxy participates in the bulk motion of the Local Sheet away from the Local
Void. The component of our motion on an intermediate scale is attributed to the
Virgo Cluster and its surroundings, 17 Mpc away. The third and largest
component is an attraction on scales larger than 3000 km/s and centered near
the direction of the Centaurus Cluster. The amplitudes of the three components
are 259, 185, and 455 km/s, respectively, adding collectively to 631 km/s in
the reference frame of the Local Sheet. Taking the nearby influences into
account causes the residual attributed to large scales to align with observed
concentrations of distant galaxies and reduces somewhat the amplitude of motion
attributed to their pull. On small scales, in addition to the motion of our
Local Sheet away from the Local Void, the nearest adjacent filament, the Leo
Spur, is seen to be moving in a direction that will lead to convergence with
our filament. Finally, a good distance to an isolated galaxy within the Local
Void reveals that this dwarf system has a motion of at least 230 km/s away from
the void center. Given the velocities expected from gravitational instability
theory in the standard cosmological paradigm, the distance to the center of the
Local Void must be at least 23 Mpc from our position. The Local Void is large!
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 03:59:35 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Dec 2007 02:40:53 GMT"
}
] | 2015-01-27T00:00:00 | [
[
"Tully",
"R. Brent",
""
],
[
"Shaya",
"Edward J.",
""
],
[
"Karachentsev",
"Igor D.",
""
],
[
"Courtois",
"Helene M.",
""
],
[
"Kocevski",
"Dale D.",
""
],
[
"Rizzi",
"Luca",
""
],
[
"Peel",
"Alan",
""
]
] |
0705.4140 | Miroslav Grajcar | M. Gregor, T. Plecenik, M. Prascak, R. Micunek, M. Kubinec, V.
Gasparik, M. Grajcar, P. Kus, A. Plecenik | MgB2 radio-frequency superconducting quantum interference device
prepared by atomic force microscope lithography | RevTeX4. Accepted in Appl. Phys. Lett | Appl. Phys. Lett. 91, 122502 (2007) | 10.1063/1.2779095 | null | cond-mat.supr-con | null | A new method of preparation of radio-frequency superconducting quantum
interference devices on MgB2 thin films is presented. The variable-thickness
bridge was prepared by a combination of optical lithography and of the
scratching by an atomic force microscope. The critical current of the
nanobridge was 0.35 uA at 4.2 K. Non-contact measurements of the current-phase
characteristics and of the critical current vs. temperature have been
investigated on our structures.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 04:12:29 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Aug 2007 11:21:51 GMT"
}
] | 2011-04-12T00:00:00 | [
[
"Gregor",
"M.",
""
],
[
"Plecenik",
"T.",
""
],
[
"Prascak",
"M.",
""
],
[
"Micunek",
"R.",
""
],
[
"Kubinec",
"M.",
""
],
[
"Gasparik",
"V.",
""
],
[
"Grajcar",
"M.",
""
],
[
"Kus",
"P.",
""
],
[
"Plecenik",
"A.",
""
]
] |
0705.4141 | Brett McInnes | Brett McInnes | Initial Conditions for Bubble Universes | Further clarifications; 28 pages including three eps files. This is
the final [accepted for publication] version | Phys.Rev.D77:123530,2008 | 10.1103/PhysRevD.77.123530 | null | hep-th gr-qc | null | The "bubble universes" of Coleman and De Luccia play a crucial role in string
cosmology. Since our own Universe is supposed to be of this kind, bubble
cosmology should supply definite answers to the long-standing questions
regarding cosmological initial conditions. In particular, it must explain how
an initial singularity is avoided, and also how the initial conditions for
Inflation were established. We argue that the simplest non-anthropic approach
to these problems involves a requirement that the spatial sections defined by
distinguished bubble observers should not be allowed to have arbitrarily small
volumes. Casimir energy is a popular candidate for a quantum effect which can
ensure this, but [because it violates energy conditions] there is a danger that
it could lead to non-perturbative instabilities in string theory. We make a
simple proposal for the initial conditions of a bubble universe, and show that
our proposal ensures that the system is non-perturbatively stable. Thus,
low-entropy conditions can be established at the beginning of a bubble universe
without violating the Second Law of thermodynamics and without leading to
instability in string theory. These conditions are inherited from the ambient
spacetime.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 04:26:14 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Aug 2007 07:50:47 GMT"
},
{
"version": "v3",
"created": "Thu, 29 Nov 2007 08:06:41 GMT"
},
{
"version": "v4",
"created": "Thu, 6 Mar 2008 05:02:22 GMT"
},
{
"version": "v5",
"created": "Sat, 17 May 2008 02:31:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"McInnes",
"Brett",
""
]
] |
0705.4142 | John Enyang | John Enyang | Specht modules and semisimplicity criteria for Brauer and
Birman--Murakami--Wenzl Algebras | null | null | 10.1007/s10801-007-0058-3 | null | math.RT | null | A construction of bases for cell modules of the Birman--Murakami--Wenzl (or
B--M--W) algebra $B_n(q,r)$ by lifting bases for cell modules of $B_{n-1}(q,r)$
is given. By iterating this procedure, we produce cellular bases for B--M--W
algebras on which a large abelian subalgebra, generated by elements which
generalise the Jucys--Murphy elements from the representation theory of the
Iwahori--Hecke algebra of the symmetric group, acts triangularly. The
triangular action of this abelian subalgebra is used to provide explicit
criteria, in terms of the defining parameters $q$ and $r$, for B--M--W algebras
to be semisimple. The aforementioned constructions provide generalisations, to
the algebras under consideration here, of certain results from the Specht
module theory of the Iwahori--Hecke algebra of the symmetric group.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 05:02:19 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Enyang",
"John",
""
]
] |
0705.4143 | Julius Vanko | Julius Vanko, Miroslav Sukenik and Jozef Sima | A Challenge to Control Gravity via Applying Electromagnetic
Low-Frequency Radiation - Theory and Proposed Model Experiments | 10 pages. arXiv admin note: text overlap with arXiv:physics/0304004 | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Including Vaidya metric into the model of Expansive Nondecelerative Universe
allows to localize the energy of gravitational field. A term of effective
gravitational range is introduced and classic Newton potential is substituted
for Yukawa-type potential. It allows to allocate a typical frequency value to
each gravitational field. Derived theoretical conclusions led us to investigate
the effect of electromagnetic field with a precisely predetermined frequency
and intensity on iron. We believe that under certain circumstances a decrease
in iron gravitational mass should be observed. Two model experiments verifying
the theoretical conclusions are proposed.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 05:03:05 GMT"
},
{
"version": "v2",
"created": "Wed, 21 Sep 2016 14:51:23 GMT"
}
] | 2016-09-22T00:00:00 | [
[
"Vanko",
"Julius",
""
],
[
"Sukenik",
"Miroslav",
""
],
[
"Sima",
"Jozef",
""
]
] |
0705.4144 | Takashi Onaka | T. Onaka, H. Matsuhara, T. Wada, N. Fujishiro, H. Fujiwara, M.
Ishigaki, D. Ishihara, Y. Ita, H. Kataza, W. Kim, T. Matsumoto, H. Murakami,
Y. Ohyama, S. Oyabu, I. Sakon, T. Tanabe, T. Takagi, K. Uemizu, M. Ueno, F.
Usui, H. Watarai, M. Cohen, K. Enya, T. Ootsubo, C. P. Pearson, N. Takeyama,
T. Yamamuro, and Y. Ikeda | The Infrared Camera (IRC) for AKARI - Design and Imaging Performance | Publications of the Astronomical Society of Japan, in press | null | 10.1093/pasj/59.sp2.S401 | null | astro-ph | null | The Infrared Camera (IRC) is one of two focal-plane instruments on the AKARI
satellite. It is designed for wide-field deep imaging and low-resolution
spectroscopy in the near- to mid-infrared (1.8--26.5um) in the pointed
observation mode of AKARI. IRC is also operated in the survey mode to make an
all-sky survey at 9 and 18um. It comprises three channels. The NIR channel
(1.8--5.5um) employs a 512 x 412 InSb array, whereas both the MIR-S
(4.6--13.4um) and MIR-L (12.6--26.5um) channels use 256 x 256 Si:As impurity
band conduction arrays. Each of the three channels has a field-of-view of about
10' x 10' and are operated simultaneously. The NIR and MIR-S share the same
field-of-view by virtue of a beam splitter. The MIR-L observes the sky about
$25' away from the NIR/MIR-S field-of-view. IRC gives us deep insights into the
formation and evolution of galaxies, the evolution of planetary disks, the
process of star-formation, the properties of interstellar matter under various
physical conditions, and the nature and evolution of solar system objects. The
in-flight performance of IRC has been confirmed to be in agreement with the
pre-flight expectation. This paper summarizes the design and the in-flight
operation and imaging performance of IRC.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 05:06:26 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Onaka",
"T.",
""
],
[
"Matsuhara",
"H.",
""
],
[
"Wada",
"T.",
""
],
[
"Fujishiro",
"N.",
""
],
[
"Fujiwara",
"H.",
""
],
[
"Ishigaki",
"M.",
""
],
[
"Ishihara",
"D.",
""
],
[
"Ita",
"Y.",
""
],
[
"Kataza",
"H.",
""
],
[
"Kim",
"W.",
""
],
[
"Matsumoto",
"T.",
""
],
[
"Murakami",
"H.",
""
],
[
"Ohyama",
"Y.",
""
],
[
"Oyabu",
"S.",
""
],
[
"Sakon",
"I.",
""
],
[
"Tanabe",
"T.",
""
],
[
"Takagi",
"T.",
""
],
[
"Uemizu",
"K.",
""
],
[
"Ueno",
"M.",
""
],
[
"Usui",
"F.",
""
],
[
"Watarai",
"H.",
""
],
[
"Cohen",
"M.",
""
],
[
"Enya",
"K.",
""
],
[
"Ootsubo",
"T.",
""
],
[
"Pearson",
"C. P.",
""
],
[
"Takeyama",
"N.",
""
],
[
"Yamamuro",
"T.",
""
],
[
"Ikeda",
"Y.",
""
]
] |
0705.4145 | Jingfei Zhang | Jingfei Zhang, Xin Zhang, Hongya Liu | Statefinder diagnosis for the interacting model of holographic dark
energy | 17 pages, 5 figures; accepted for publication in Phys. Lett. B | Phys.Lett.B659:26-33,2008 | 10.1016/j.physletb.2007.10.086 | null | astro-ph gr-qc hep-ph hep-th | null | In this paper, we investigate the holographic dark energy model with
interaction between dark energy and dark matter, from the statefinder
viewpoint. We plot the trajectories of the interacting holographic dark energy
model for different interaction cases as well as for different values of the
parameter $c$ in the statefinder-plane. The statefinder diagrams characterize
the properties of the holographic dark energy and show the discrimination
between the two cases with and without interaction. As a result, we show the
influence of the interaction to the evolution of the universe in the
statefinder diagrams. Moreover, as a complement to the statefinder diagnosis,
we study the interacting holographic dark energy model in the $w-w'$ plane,
which can provide us with a dynamical diagnosis.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 05:26:32 GMT"
},
{
"version": "v2",
"created": "Sat, 27 Oct 2007 08:46:23 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Zhang",
"Jingfei",
""
],
[
"Zhang",
"Xin",
""
],
[
"Liu",
"Hongya",
""
]
] |
0705.4146 | Reg Cahill | Reginald T Cahill (Flinders University) | Dynamical 3-Space: A Review | Latex, 61 pages, 23 eps files, some color. To be published Improved
analysis of Michelson-Morley fringe shifts | Ether Space-time and Cosmology: New Insights into a Key Physical
Medium, M. Duffy and J. Levy, eds., Apeiron, 135-200, 2009 | null | null | physics.gen-ph | null | For some 100 years physics has modelled space and time via the spacetime
concept, with space being merely an observer dependent perspective effect of
that spacetime - space itself had no observer independent existence - it had no
ontological status, and it certainly had no dynamical description. In recent
years this has all changed. In 2002 it was discovered that a dynamical 3-space
had been detected many times, including the Michelson-Morley 1887 light-speed
anisotropy experiment. Here we review the dynamics of this 3-space, tracing its
evolution from that of an emergent phenomena in the information-theoretic
Process Physics to the phenomenological description in terms of a velocity
field describing the relative internal motion of the structured 3-space. The
new physics of the dynamical 3-space is extensively tested against experimental
and astronomical observations, including the necessary generalisation of the
Maxwell, Schrodinger and Dirac equations, leading to a derivation and
explanation of gravity as a refraction effect of quantum matter waves. The flat
and curved spacetime formalisms are derived from the new physics, so explaining
their apparent many successes.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 05:39:50 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 03:34:41 GMT"
}
] | 2010-07-28T00:00:00 | [
[
"Cahill",
"Reginald T",
"",
"Flinders University"
]
] |
0705.4147 | Ujjal Debnath | Writambhara Chakraborty, Ujjal Debnath | Effect of Dynamical Cosmological Constant in presence of Modified
Chaplygin Gas for Accelerating Universe | 12 latex pages, 14 figures, revtex style | Astrophys.Space Sci.313:409-417,2008 | 10.1007/s10509-007-9710-6 | null | gr-qc | null | In this paper we have considered the Universe to be filled with Modified Gas
and the Cosmological Constant $\Lambda$ to be time-dependent with or without
the Gravitational Constant $G$ to be time-dependent. We have considered various
phenomenological models for $\Lambda$, viz., $\Lambda\propto\rho,
\Lambda\propto\frac{\dot{a}^{2}}{a^{2}}$ and
$\Lambda\propto\frac{\ddot{a}}{a}$. Using these models it is possible to show
the accelerated expansion of the Universe at the present epoch. Also we have
shown the natures of $G$ and $\Lambda$ over the total age of the Universe.
Using the statefinder parameters we have shown the diagramamtical
representation of the evolution of the Universe starting from radiation era to
$\Lambda$CDM model.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 06:24:14 GMT"
}
] | 2011-07-19T00:00:00 | [
[
"Chakraborty",
"Writambhara",
""
],
[
"Debnath",
"Ujjal",
""
]
] |
0705.4148 | Yury Stepanyants | L.M. Cooks, Y.A. Stepanyants | Picone identities for half-linear differential equations of fourth order | null | null | null | null | math.CA math.SP | null | Picone-type identities are established for half-linear ODEs of fourth order
(one-dimensional p-biLaplacian). It is shown that in the linear case they
reduce to the known identities for fourth order linear ODEs. Picone-type
identity known for two half-linear second-order equations is also generalised
to set of equations greater than two.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 06:52:44 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Cooks",
"L. M.",
""
],
[
"Stepanyants",
"Y. A.",
""
]
] |
0705.4149 | W.-Y. P. Hwang | W-Y. P. Hwang | What happened to the Cosmological QCD Phase Transition? | 16 pages, 1 figure | null | 10.1142/S0217732307025200 | null | hep-ph | null | The scenario that some first-order phase transitions may have taken place in
the early Universe offers us one of the most intriguing and fascinating
questions in cosmology. Indeed, the role played by the latent "heat" or energy
released in the phase transition is highly nontrivial and may lead to some
surprising, important results. In this paper, we take the wisdom that the
cosmological QCD phase transition, which happened at a time between 10^(-5) sec
and 10^(-4) sec or at the temperature of about 150 MeV and accounts for
confinement of quarks and gluons to within hadrons, would be of first order. To
get the essence out of the scenario, it is sufficient to approximate the true
QCD vacuum as one of degenerate theta-vacua and when necessary we try to model
it effectively via a complex scalar field with spontaneous symmetry breaking.
We examine how and when "pasted" or "patched" domain walls are formed, how long
such walls evolve in the long run, and we believe that the significant portion
of dark matter could be accounted for in terms of such domain-wall structure
and its remnants. Of course, the cosmological QCD phase transition happened in
the way such that the false vacua associated with baryons and many other
color-singlet objects did not disappear (that is, using the bag-model language,
there are bags of radius 1.0 fermi for the baryons) - but the amount of the
energy remained in the false vacua is negligible. The latent energy released
due to the conversion of the false vacua to the true vacua, in the form of
"pasted" or "patched" domain walls in the short run and their numerous evolved
objects, should make the concept of the "radiation-dominated" epoch, or of the
"matter-dominated" epoch to be re-examined.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 07:03:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hwang",
"W-Y. P.",
""
]
] |
0705.4150 | N. K. Smolentsev | P.N. Podkur and N.K. Smolentsev | About construction of orthogonal wavelets with compact support and with
scaling coefficient N | LaTeX2e, 15 pages | null | null | null | math.FA | null | In this paper a simple method of construction of scaling function $\phi (x)$
and orthogonal wavelets with the compact support for any natural coefficient of
scaling $N\ge 2$ is given. Examples of construction of wavelets for
coefficients of scaling N=2 and N=3 are produced.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 07:22:43 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Podkur",
"P. N.",
""
],
[
"Smolentsev",
"N. K.",
""
]
] |
0705.4151 | Maria Deijfen | Maria Deijfen, Henri van den Esker, Remco van der Hofstad, Gerard
Hooghiemstra | A preferential attachment model with random initial degrees | In the published form of the paper, the proof of Proposition 2.1 is
incomplete. This version contains the complete proof | null | 10.1007/s11512-007-0067-4 | null | math.PR math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a random graph process ${G(t)}_{t\geq 1}$ is studied and its
degree sequence is analyzed. Let $(W_t)_{t\geq 1}$ be an i.i.d. sequence. The
graph process is defined so that, at each integer time $t$, a new vertex, with
$W_t$ edges attached to it, is added to the graph. The new edges added at time
t are then preferentially connected to older vertices, i.e., conditionally on
$G(t-1)$, the probability that a given edge is connected to vertex i is
proportional to $d_i(t-1)+\delta$, where $d_i(t-1)$ is the degree of vertex $i$
at time $t-1$, independently of the other edges. The main result is that the
asymptotical degree sequence for this process is a power law with exponent
$\tau=\min\{\tau_{W}, \tau_{P}\}$, where $\tau_{W}$ is the power-law exponent
of the initial degrees $(W_t)_{t\geq 1}$ and $\tau_{P}$ the exponent predicted
by pure preferential attachment. This result extends previous work by Cooper
and Frieze, which is surveyed.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 07:28:13 GMT"
},
{
"version": "v2",
"created": "Sat, 8 Feb 2020 11:47:44 GMT"
},
{
"version": "v3",
"created": "Thu, 4 Jun 2020 07:10:06 GMT"
}
] | 2020-06-05T00:00:00 | [
[
"Deijfen",
"Maria",
""
],
[
"Esker",
"Henri van den",
""
],
[
"van der Hofstad",
"Remco",
""
],
[
"Hooghiemstra",
"Gerard",
""
]
] |
0705.4152 | Andrea Aiello | A. Aiello, G. Puentes, D. Voigt, J.P. Woerdman | Maximally Entangled Mixed-State Generation via Local Operations | 5 pages, 2 figures, to be published in Physical Review A | null | 10.1103/PhysRevA.75.062118 | null | quant-ph | null | We present a general theoretical method to generate maximally entangled mixed
states of a pair of photons initially prepared in the singlet polarization
state. This method requires only local operations upon a single photon of the
pair and exploits spatial degrees of freedom to induce decoherence. We report
also experimental confirmation of these theoretical results.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 07:31:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aiello",
"A.",
""
],
[
"Puentes",
"G.",
""
],
[
"Voigt",
"D.",
""
],
[
"Woerdman",
"J. P.",
""
]
] |
0705.4153 | Sander Dommers | Sander Dommers, Remco van der Hofstad, Gerard Hooghiemstra | Diameters in preferential attachment models | null | Journal of Statistical Physics, 139(1):72-107, (2010) | 10.1007/s10955-010-9921-z | null | math.PR math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the diameter in preferential attachment (PA-)
models, thus quantifying the statement that these models are small worlds. The
models studied here are such that edges are attached to older vertices
proportional to the degree plus a constant, i.e., we consider affine PA-models.
There is a substantial amount of literature proving that, quite generally,
PA-graphs possess power-law degree sequences with a power-law exponent \tau>2.
We prove that the diameter of the PA-model is bounded above by a constant
times \log{t}, where t is the size of the graph. When the power-law exponent
\tau exceeds 3, then we prove that \log{t} is the right order, by proving a
lower bound of this order, both for the diameter as well as for the typical
distance. This shows that, for \tau>3, distances are of the order \log{t}. For
\tau\in (2,3), we improve the upper bound to a constant times \log\log{t}, and
prove a lower bound of the same order for the diameter. Unfortunately, this
proof does not extend to typical distances. These results do show that the
diameter is of order \log\log{t}.
These bounds partially prove predictions by physicists that the typical
distance in PA-graphs are similar to the ones in other scale-free random
graphs, such as the configuration model and various inhomogeneous random graph
models, where typical distances have been shown to be of order \log\log{t} when
\tau\in (2,3), and of order \log{t} when \tau>3.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 07:32:27 GMT"
},
{
"version": "v2",
"created": "Tue, 12 May 2009 08:30:40 GMT"
},
{
"version": "v3",
"created": "Tue, 13 Apr 2010 13:33:10 GMT"
}
] | 2010-04-14T00:00:00 | [
[
"Dommers",
"Sander",
""
],
[
"van der Hofstad",
"Remco",
""
],
[
"Hooghiemstra",
"Gerard",
""
]
] |
0705.4154 | Glen Goodvin | Mona Berciu and Glen L. Goodvin | Systematic improvement of the Momentum Average approximation for the
Green's function of a Holstein polaron | 15 pages, 13 figures | Phys. Rev. B 76, 165109 (2007) | 10.1103/PhysRevB.76.165109 | null | cond-mat.str-el | null | We show how to systematically improve the Momentum Average (MA)approximation
for the Green's function of a Holstein polaron, bysystematically improving the
accuracy of the self-energy diagrams in such a way that they can still all be
summed efficiently. This allows us to fix some of the problems of the MA
approximation, e.g. we now find the expected polaron+phonon continuum at the
correct location, and a momentum-dependent self-energy. The quantitative
agreement with numerical data is further improved, as expected since the number
of exactly satisfied spectral weight sum rules is increased. The corrections
are found to be larger in lower dimensional systems.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 07:36:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Berciu",
"Mona",
""
],
[
"Goodvin",
"Glen L.",
""
]
] |
0705.4155 | Du\v{s}an Repov\v{s} | M. Cencelj, Yu. V. Muranov, D. Repov\v{s} | On $\pi - \pi$ theorem for manifold pairs with boundaries | null | Mathematical Notes 81: 3-4 (2007), 356-364 | null | null | math.GT math.AT | null | Surgery obstruction of a normal map to a simple Poincare pair $(X,Y)$ lies in
the relative surgery obstruction group $L_*(\pi_1(Y)\to\pi_1(X))$. A well known
result of Wall, the so called $\pi$-$\pi$ theorem, states that in higher
dimensions a normal map of a manifold with boundary to a simple Poincare pair
with $\pi_1(X)\cong\pi_1(Y)$ is normally bordant to a simple homotopy
equivalence of pairs. In order to study normal maps to a manifold with a
submanifold, Wall introduced surgery obstruction group for manifold pairs
$LP_*$ and splitting obstruction groups $LS_*$. In the present paper we
formulate and prove for manifold pairs with boundaries the results which are
similar to the $\pi$-$\pi$ theorem. We give direct geometric proofs, which are
based on the original statements of Wall's results and apply obtained results
to investigate surgery on filtered manifolds.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 08:16:35 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Cencelj",
"M.",
""
],
[
"Muranov",
"Yu. V.",
""
],
[
"Repovš",
"D.",
""
]
] |
0705.4156 | Wei-Qin Zhao | R. Friedberg and T. D. Lee | Hidden Symmetry of the CKM and Neutrino Mapping Matrices | 25 pages | AnnalsPhys.323:1087-1105,2008 | 10.1016/j.aop.2007.06.004 | null | hep-ph | null | We propose that the smallness of the light quark masses is related to the
smallness of the T violation in hadronic weak interactions. Accordingly, for
each of the two quark sectors ("upper" and "lower") we construct a 3\times 3
mass matrix in a bases of unobserved quark states, such that the "upper"and
"lower" basis states correspond exactly via the $W^\pm$ transitions in the weak
interaction. In the zeroth approximation of our formulation, we assume T
conservation by making all matrix elements real. In addition, we impose a
"hidden symmetry" (invariance under simultaneous translations of all three
basis quark states in each sector), which ensures a zero mass eigenstate in
each sector.
Next, we simultaneously break the hidden symmetry and T invariance by
introducing a phase factor e^{i\chi} in the interaction for each sector. The
Jarlskog invariant J_{CKM}, as well as the light quark masses are evaluated in
terms of the parameters of the model. We find a simple relation with
J_{CKM}=(m_dm_s/m_b^2)^{1/2}A\lambda^3\cos(\chi/2), with A and \lambda the
Wolfenstein parameters. Setting J_{CKM}=3.08 \times 10^{-5}, m_b=4.7GeV,
m_s=95MeV, A=0.818 and \lambda=0.227, we find m_d\cos^2(\chi/2) \simeq 2.4MeV,
consistent with the accepted value m_d=3-7MeV.
We make a parallel proposal for the lepton sectors. With the hidden symmetry
and in the approximation of T invariance, both the masses of e and \nu_1 are
zero. The neutrino mapping matrix V_\nu is shown to be of the same
Harrison-Scott form which is in agreement with experiments. We also examine the
correction due to T violation, and evaluate the corresponding Jarlskog
invariant {\cal J}_\nu.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 08:00:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Friedberg",
"R.",
""
],
[
"Lee",
"T. D.",
""
]
] |
0705.4157 | Branko \'Curgus | Paul Binding, Branko \'Curgus | Riesz bases of root vectors of indefinite Sturm-Liouville problems with
eigenparameter dependent boundary conditions. II | 27 pages | Integral Equations and Operator Theory 63 (2009) no. 4, 473--499 | null | null | math.CA math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a regular indefinite Sturm-Liouville problem with two
self-adjoint boundary conditions affinely dependent on the eigenparameter. We
give sufficient conditions under which the root vectors of this Sturm-Liouville
problem can be selected to form a Riesz basis of a corresponding weighted
Hilbert space.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 08:19:51 GMT"
},
{
"version": "v2",
"created": "Sat, 2 Aug 2008 23:09:10 GMT"
}
] | 2012-06-11T00:00:00 | [
[
"Binding",
"Paul",
""
],
[
"Ćurgus",
"Branko",
""
]
] |
0705.4158 | Tiberiu Harko | C. G. Boehmer, T. Harko | Can dark matter be a Bose-Einstein condensate? | 20 pages, 7 figures, accepted for publication in JCAP, references
added | JCAP 0706:025,2007 | 10.1088/1475-7516/2007/06/025 | null | astro-ph gr-qc hep-th | null | We consider the possibility that the dark matter, which is required to
explain the dynamics of the neutral hydrogen clouds at large distances from the
galactic center, could be in the form of a Bose-Einstein condensate. To study
the condensate we use the non-relativistic Gross-Pitaevskii equation. By
introducing the Madelung representation of the wave function, we formulate the
dynamics of the system in terms of the continuity equation and of the
hydrodynamic Euler equations. Hence dark matter can be described as a
non-relativistic, Newtonian Bose-Einstein gravitational condensate gas, whose
density and pressure are related by a barotropic equation of state. In the case
of a condensate with quartic non-linearity, the equation of state is polytropic
with index $n=1$. To test the validity of the model we fit the Newtonian
tangential velocity equation of the model with a sample of rotation curves of
low surface brightness and dwarf galaxies, respectively. We find a very good
agreement between the theoretical rotation curves and the observational data
for the low surface brightness galaxies. The deflection of photons passing
through the dark matter halos is also analyzed, and the bending angle of light
is computed. The bending angle obtained for the Bose-Einstein condensate is
larger than that predicted by standard general relativistic and dark matter
models. Therefore the study of the light deflection by galaxies and the
gravitational lensing could discriminate between the Bose-Einstein condensate
dark matter model and other dark matter models.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 08:32:01 GMT"
},
{
"version": "v2",
"created": "Sat, 2 Jun 2007 03:58:33 GMT"
},
{
"version": "v3",
"created": "Mon, 11 Jun 2007 02:16:39 GMT"
},
{
"version": "v4",
"created": "Thu, 21 Jun 2007 06:59:53 GMT"
}
] | 2010-10-27T00:00:00 | [
[
"Boehmer",
"C. G.",
""
],
[
"Harko",
"T.",
""
]
] |
0705.4159 | Du\v{s}an Repov\v{s} | K. Eda, U. H. Karimov, D. Repov\v{s} | On the fundamental group of $\mathbb R^3$ modulo the Case-Chamberlin
continuum | null | Glasnik Mat. 42:1 (2007), 89-94 | null | null | math.GT math.AT | null | It has been known for a long time that the fundamental group of the quotient
of $\RR ^3$ by the Case-Chamberlin continuum is nontrivial. In the present
paper we prove that this group is in fact, uncountable.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 13:55:36 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Eda",
"K.",
""
],
[
"Karimov",
"U. H.",
""
],
[
"Repovš",
"D.",
""
]
] |
0705.4160 | Timo R\"uppell | M. Frank, K. Huitu and T. R\"uppell | Higgs and neutrino sector, EDM and epsilon_K in a spontaneously CP and
R-parity breaking supersymmetric model | 13 pages, 7 figures, submitted to EPJC | Eur.Phys.J.C52:413-423,2007 | 10.1140/epjc/s10052-007-0370-z | null | hep-ph | null | We construct an extension of the supersymmetric standard model where both CP
symmetry and R-parity are spontaneously broken. We study the electroweak
symmetry breaking sector of the model and find minima consistent with the
experimental bounds on Higgs boson masses. Neutrino masses and mixing angles
are generated through both seesaw and bilinear R-parity violation. We show that
the hierarchical mass pattern is obtained, and mixings are consistent with
measured values. Due to the spontaneous CP and R-parity violation, the neutrino
sector is CP violating, and we calculate the corresponding phase. We further
restrict the parameter space to agree with the limits on the electric dipole
moment of the neutron. Finally, we study the CP violation parameter epsilon_K
in the kaon system and show that we obtain results consistent with the
experimental value.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:52:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Frank",
"M.",
""
],
[
"Huitu",
"K.",
""
],
[
"Rüppell",
"T.",
""
]
] |
0705.4161 | Branko \'Curgus | Paul Binding, Branko \'Curgus | Riesz Bases of Root Vectors of Indefinite Sturm-Liouville problems with
eigenparameter dependent boundary conditions, I | 21 pages | Operator Theory: Advances and Applications, Vol. 163,
Birkh\"auser, 2006, 75--96 | null | null | math.CA math.FA | null | We consider a regular indefinite Sturm-Liouville problem with two
self-adjoint boundary conditions, one being affinely dependent on the
eigenparameter. We give sufficient conditions under which a basis of each root
subspace for this Sturm-Liouville problem can be selected so that the union of
all these bases constitutes a Riesz basis of a corresponding weighted Hilbert
space.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 08:41:59 GMT"
}
] | 2012-06-11T00:00:00 | [
[
"Binding",
"Paul",
""
],
[
"Ćurgus",
"Branko",
""
]
] |
0705.4162 | Gaelle Dumas | Gaelle Dumas (CRAL, ARI), Carole Mundell (ARI), Eric Emsellem (CRAL),
Neil Nagar | The Central Kiloparsec of Seyfert and Inactive Host Galaxies: a
Comparison of Two-Dimensional Stellar and Gaseous Kinematics | Accepted for publication in MNRAS, 34 pages, 20 figures | Mon.Not.Roy.Astron.Soc.379:1249-1278,2007 | 10.1111/j.1365-2966.2007.12014.x | null | astro-ph | null | We investigate the properties of the two-dimensional distribution and
kinematics of ionised gas and stars in the central kiloparsecs of a matched
sample of nearby active (Seyfert) and inactive galaxies, using the SAURON
Integral Field Unit on the William Herschel Telescope. The ionised gas
distributions show a range of low excitation regions such as star formation
rings in Seyferts and inactive galaxies, and high excitation regions related to
photoionisation by the AGN. The stellar kinematics of all galaxies in the
sample show regular rotation patterns typical of disc-like systems, with
kinematic axes which are well aligned with those derived from the outer
photometry and which provide a reliable representation of the galactic line of
nodes. After removal of the non-gravitational components due to e.g. AGN-driven
outflows, the ionised gas kinematics in both the Seyfert and inactive galaxies
are also dominated by rotation with global alignment between stars and gas in
most galaxies. This result is consistent with previous findings from
photometric studies that the large-scale light distribution of Seyfert hosts
are similar to inactive hosts. However, fully exploiting the two-dimensional
nature of our spectroscopic data, deviations from axisymmetric rotation in the
gaseous velocity fields are identified that suggest the gaseous kinematics are
more disturbed at small radii in the Seyfert galaxies compared with the
inactive galaxies, providing a tentative link between nuclear gaseous streaming
and nuclear activity.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 14:47:11 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Dumas",
"Gaelle",
"",
"CRAL, ARI"
],
[
"Mundell",
"Carole",
"",
"ARI"
],
[
"Emsellem",
"Eric",
"",
"CRAL"
],
[
"Nagar",
"Neil",
""
]
] |
0705.4163 | Gabriele Breuer | Rainer Beck (MPI fuer Radioastronomie, Bonn, Germany) | Magnetism in the spiral galaxy NGC 6946: magnetic arms, depolarization
rings, dynamo modes and helical fields | 18 pages, 28 figures. Accepted for publication in A&A. Corrected typo
in Sect. 3.1 04/06/2007 | null | 10.1051/0004-6361:20066988 | null | astro-ph | null | The spiral galaxy NGC 6946 was observed in total intensity and linear
polarization in five radio bands between 3cm and 21cm. At the inner edge of the
inner gas spiral arm the ordered magnetic field is only mildly compressed and
turns smoothly, to become aligned along the gas arm. Hence the field is not
shocked and is probably connected to the warm, diffuse gas. At larger radii,
two bright magnetic arms between the optical arms are visible in polarized
intensity. The field in the northern magnetic arm is almost totally aligned.
Faraday rotation measures (RM) in these arms are consistent with the
superposition of two low azimuthal dynamo modes. Three more magnetic arms are
discovered in the outer galaxy, located between HI arms. Due to strong Faraday
depolarization the galaxy is not transparent to polarized waves at 18cm and
20cm. The large-scale asymmetry in depolarization with respect to the major
axis may be another indication of large-scale helical fields. Three
depolarization rings of almost zero polarization seen at 20cm are probably
generated by differential Faraday rotation in HII complexes in NGC 6946 of
300-500 pc size. - In the gas/optical spiral arms, the total (mostly turbulent)
magnetic field is amplified to \simeq 20\muG. Its energy density is \simeq 10
times larger than that of the ionized gas and is similar to that of the
turbulent gas motions in the inner galaxy. The magnetic energy exceeds that of
the turbulent energy in the outer galaxy.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 08:44:49 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 13:16:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Beck",
"Rainer",
"",
"MPI fuer Radioastronomie, Bonn, Germany"
]
] |
0705.4164 | Lyubov' Manakova A. | Yu. Kagan and L.A. Manakova | Formation of a condensed state with macroscopic number of phonons in
ultracold Bose gases | 9 pages, 8 figures | null | 10.1103/PhysRevA.76.023601 | null | cond-mat.other | null | A mechanism for the formation of a new type of stationary state with
macroscopical number of phonons in condensed atomic gases is proposed. This
mechanism is based on generating longitudinal phonons as a result of parametric
resonance caused by a permanent modulation of the transverse trap frequency in
an elongated trap. The phonon-phonon interaction predetermines the
self-consistent evolution which is completed with macroscopic population of one
from all levels within the energy interval of parametric amplification. This
level proves to be shifted to the edge of this interval. All other levels end
the evolution with zero population.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 08:49:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kagan",
"Yu.",
""
],
[
"Manakova",
"L. A.",
""
]
] |
0705.4165 | Duer Wolfgang | W. D\"ur and H. J. Briegel | Entanglement purification and quantum error correction | review article; 48 pages, 18 figures; V2:published version | Rep. Prog. Phys. 70, 1381 (2007) | 10.1088/0034-4885/70/8/R03 | null | quant-ph | null | We give a review on entanglement purification for bipartite and multipartite
quantum states, with the main focus on theoretical work carried out by our
group in the last couple of years. We discuss entanglement purification in the
context of quantum communication, where we emphasize its close relation to
quantum error correction. Various bipartite and multipartite entanglement
purification protocols are discussed, and their performance under idealized and
realistic conditions is studied. Several applications of entanglement
purification in quantum communication and computation are presented, which
highlights the fact that entanglement purification is a fundamental tool in
quantum information processing.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 08:59:11 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 09:43:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dür",
"W.",
""
],
[
"Briegel",
"H. J.",
""
]
] |
0705.4166 | Du\v{s}an Repov\v{s} | M. Cencelj, D. Repov\v{s}, M. Skopenkov | Classification of framed links in 3-manifolds | Some references were added and some minor corrections and comments
were made | Proc. Indian Acad. Sci. (Math. Sci.) 117:3 (2007), 301-306. | null | null | math.GT math.AT | null | We present a short proof of the following Pontryagin theorem, whose original
proof was complicated and has never been published in details: {\bf Theorem.}
Let $M$ be a connected oriented closed smooth 3-manifold. Let $L_1(M)$ be the
set of framed links in $M$ up to a framed cobordism. Let $\deg:L_1(M)\to
H_1(M;\Z)$ be the map taking a framed link to its homology class. Then for each
$\alpha\in H_1(M;\Z)$ there is a 1-1 correspondence between the set
$\deg\nolimits^{-1}\alpha$ and the group $\Bbb Z_{2d(\alpha)}$, where
$d(\alpha)$ is the divisibility of the projection of $\alpha$ to the free part
of $H_1(M;\Bbb Z)$.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:02:44 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jun 2007 13:55:50 GMT"
}
] | 2008-03-29T00:00:00 | [
[
"Cencelj",
"M.",
""
],
[
"Repovš",
"D.",
""
],
[
"Skopenkov",
"M.",
""
]
] |
0705.4167 | Pavel Saponov | D. I. Gurevich, P. A. Saponov | Quantum Lie algebras via modified Reflection Equation Algebra | Talk, given by D.Gurevich at the Satellite Conference "From Lie
algebras to quantum groups", Coimbra (Portugal), Juin 2006. To be published
in the Proceedings of the Conference. Some essential typos in macrocommands
were corrected | null | null | null | math.QA | null | We discuss the consistency of the axioms which the definition of quantum Lie
algebras is usually based on.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:09:21 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Dec 2007 14:47:17 GMT"
}
] | 2007-12-12T00:00:00 | [
[
"Gurevich",
"D. I.",
""
],
[
"Saponov",
"P. A.",
""
]
] |
0705.4168 | Werner Krauth | J. G. Malherbe and Werner Krauth | Selective-pivot sampling of radial distribution functions in asymmetric
liquid mixtures | 5 pages, 5 figures | Molecular Physics 105, 2393 (2007) | 10.1080/00268970701678907 | null | cond-mat.soft | null | We present a Monte Carlo algorithm for selectively sampling radial
distribution functions and effective interaction potentials in asymmetric
liquid mixtures. We demonstrate its efficiency for hard-sphere mixtures, and
for model systems with more general interactions, and compare our simulations
with several analytical approximations. For interaction potentials containing a
hard-sphere contribution, the algorithm yields the contact value of the radial
distribution function.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:13:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Malherbe",
"J. G.",
""
],
[
"Krauth",
"Werner",
""
]
] |
0705.4169 | Osamu Seto | Edmund J. Copeland and Osamu Seto | Dynamical solutions of warped six dimensional supergravity | 18 pages, no figure, typos corrected, references added, the final
version | JHEP 0708:001,2007 | 10.1088/1126-6708/2007/08/001 | IFT-UAM/CSIC-07-30 | hep-th astro-ph gr-qc | null | We derive a new class of exact time dependent solutions in a warped six
dimensional supergravity model. Under the assumptions we make for the form of
the underlying moduli fields, we show that the only consistent time dependent
solutions lead to all six dimensions evolving in time, implying the eventual
decompactification or collapse of the extra dimensions. We also show how the
dynamics affects the quantization of the deficit angle.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:23:58 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Aug 2007 18:20:36 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Copeland",
"Edmund J.",
""
],
[
"Seto",
"Osamu",
""
]
] |
0705.4170 | Stoil Donev | Stoil Donev, Maria Tashkova | Frobenius Curvature, Electromagnetic Strain and Description of
Photon-like Objects | 22 pages, no figures, comments and explanations added, submitted for
publication | null | null | null | hep-th | null | This paper aims to present a general idea for description of spatially finite
physical objects with a consistent nontrivial translational-rotational
dynamical structure and evolution as a whole, making use of the mathematical
concepts and structures connected with the Frobenius
integrability/nonintegrability theorems and electromagnetic strain quantities.
The idea is based on consideration of {\it nonintegrable} subdistributions of
some appropriate completely integrable distribution (differential system) on a
manifold and then to make use of the corresponding curvatures and
correspondingly directed strains as measures of interaction, i.e. of
energy-momentum exchange among the physical subsystems mathematically
represented by the nonintegrable subdistributions. The concept of photon-like
object is introduced and description (including lagrangian) of such objects in
these terms is given.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:24:21 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Mar 2008 11:32:02 GMT"
}
] | 2008-03-05T00:00:00 | [
[
"Donev",
"Stoil",
""
],
[
"Tashkova",
"Maria",
""
]
] |
0705.4171 | Eva Borbely | Eva Borbely | Grover search algorithm | null | null | null | null | cs.DS | null | A quantum algorithm is a set of instructions for a quantum computer, however,
unlike algorithms in classical computer science their results cannot be
guaranteed. A quantum system can undergo two types of operation, measurement
and quantum state transformation, operations themselves must be unitary
(reversible). Most quantum algorithms involve a series of quantum state
transformations followed by a measurement. Currently very few quantum
algorithms are known and no general design methodology exists for their
construction.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:42:46 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Borbely",
"Eva",
""
]
] |
0705.4172 | Antonino D' A\'i | A. D'A\'i, P. Zycki, T. Di Salvo, R. Iaria, G. Lavagetto, N.R. Robba | Broad-band Spectral Evolution of Scorpius X-1 along its Color-Color
Diagram | 18 pages. Accepted for publication in ApJ | null | 10.1086/519944 | null | astro-ph | null | We analyze a large collection of RXTE archive data from April 1997 to August
2003 of the bright X-ray source Scorpius X-1 in order to study the broadband
spectral evolution of the source for different values of the inferred mass
accretion rate by studying energy spectra from selected regions in the Z-track
of its Color-Color Diagram. A two-component model, consisting of a soft thermal
component interpreted as thermal emission from an accretion disk and a thermal
Comptonization component, is unable to fit the whole 3--200 keV energy spectrum
at low accretion rates. Strong residuals in the highest energy band of the
spectrum require the addition of a third component that can be fitted with a
power-law component, that could represent a second thermal Comptonization from
a much hotter plasma, or a hybrid thermal/non-thermal Comptonization. We
discuss the physical implications derived from the results of our analysis,
with a particular emphasis on the hardest part of the X-ray emission and its
possible origins.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:30:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"D'Aí",
"A.",
""
],
[
"Zycki",
"P.",
""
],
[
"Di Salvo",
"T.",
""
],
[
"Iaria",
"R.",
""
],
[
"Lavagetto",
"G.",
""
],
[
"Robba",
"N. R.",
""
]
] |
0705.4173 | Olav F. Syljuasen | Olav F. Syljuasen | Using the average spectrum method to extract dynamics from quantum Monte
Carlo simulations | v2: Major revision. Title and abstract as well as the focus of the
paper have been changed. Added a figure about the dynamics of 1D Heisenberg
chain | Phys. Rev. B 78, 174429 (2008) | 10.1103/PhysRevB.78.174429 | NORDITA-2007-18 | cond-mat.str-el cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the Average Spectrum Method to the problem of getting the excitation
spectrum from imaginary-time quantum Monte Carlo simulations. We show that with
high quality QMC data this method reproduces the dominant spectral features
very well. It is also capable of giving information on the spectrum in regions
dominated by the many-particle continuum of excitations.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:32:16 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Nov 2008 14:07:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Syljuasen",
"Olav F.",
""
]
] |
0705.4174 | J\'anos K. Asb\'oth | J. K. Asboth, P. Domokos | Comment on ``Coupled dynamics of atoms and radiation--pressure--driven
interferometers'' | A long comment on the recent Meiser-Meystre papers on the
"super-strong coupling" regime. Submitted to PRA | null | null | null | quant-ph | null | In two recent articles, Meiser and Meystre describe the coupled dynamics of a
dense gas of atoms and an optical cavity pumped by a laser field. They make two
important simplifying assumptions: (i) the gas of atoms forms a regular lattice
and can be replaced by a fictitious mirror, and (ii) the atoms strive to
minimize the dipole potential. We show that the two assumptions are
inconsistent: the configuration of atoms minimizing the dipole potential is not
a perfect lattice. Assumption (ii) is erroneous, as in the strong coupling
regime the dipole force does not arise from the dipole potential. The real
steady state, where the dipole forces vanish, is indeed a regular lattice.
Furthermore, the bistability predicted by Meiser and Meystre does not occur in
this system.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:33:30 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Asboth",
"J. K.",
""
],
[
"Domokos",
"P.",
""
]
] |
0705.4175 | JinLin Han | Jinlin Han (NAOC) | Magnetic fields of our Galaxy on large and small scales | 9 pages. Invited Talk at IAU Symp.242, 'Astrophysical Masers and
their Environments', Proceedings edited by J. M. Chapman & W. A. Baan | IAU Symposium, Volume 242, p. 55-63 (2008) | 10.1017/S1743921307012562 | null | astro-ph | null | Magnetic fields have been observed on all scales in our Galaxy, from AU to
kpc. With pulsar dispersion measures and rotation measures, we can directly
measure the magnetic fields in a very large region of the Galactic disk. The
results show that the large-scale magnetic fields are aligned with the spiral
arms but reverse their directions many times from the inner-most arm (Norma) to
the outer arm (Perseus). The Zeeman splitting measurements of masers in HII
regions or star-formation regions not only show the structured fields inside
clouds, but also have a clear pattern in the global Galactic distribution of
all measured clouds which indicates the possible connection of the large-scale
and small-scale magnetic fields.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:07:16 GMT"
}
] | 2009-01-01T00:00:00 | [
[
"Han",
"Jinlin",
"",
"NAOC"
]
] |
0705.4176 | Kareljan Schoutens | O.S. Zozulya, M. Haque, K. Schoutens, E.H. Rezayi | Bipartite entanglement entropy in fractional quantum Hall states | 12 pages, 7 figures, small corrections to table III and references
added | Physical Review B76, 125310 (2007) | 10.1103/PhysRevB.76.125310 | ITFA-2007-21 | cond-mat.mes-hall | null | We present a detailed analysis of bipartite entanglement entropies in
fractional quantum Hall (FQH) states, considering both abelian (Laughlin) and
non-abelian (Moore-Read) states. We derive upper bounds for the entanglement
between two subsets of the particles making up the state. We also consider the
entanglement between spatial regions supporting a FQH state. Using the latter,
we show how the so-called topological entanglement entropy of a FQH state can
be extracted from wavefunctions for a limited number of particles.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:10:38 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Oct 2007 08:37:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zozulya",
"O. S.",
""
],
[
"Haque",
"M.",
""
],
[
"Schoutens",
"K.",
""
],
[
"Rezayi",
"E. H.",
""
]
] |
0705.4177 | Michal Kolar | M. Kolar, T. Opatrny, N. Bar-Gill, N. Erez, G. Kurizki | Path-phase duality of an interfering particle with
translational-internal entanglement | 14 pages, 5 figures | New J. Phys. 9 (2007) 129 | 10.1088/1367-2630/9/5/129 | null | quant-ph | null | The aim of this paper is to revisit the implications of complementarity when
we inject into a Mach Zehnder interferometer particles with internal structure,
prepared in special translational-internal entangled (TIE) states. This
correlation causes the path distinguishability to be phase dependent in
contrast to the standard case. We show that such a TIE state permits us to
detect small phase shifts along with almost perfect path distinguishability,
beyond the constraints imposed by complementarity on simultaneous which-way and
which-phase measurements for standard cases (when distinguishability is
independent of interferometric phase).
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:54:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kolar",
"M.",
""
],
[
"Opatrny",
"T.",
""
],
[
"Bar-Gill",
"N.",
""
],
[
"Erez",
"N.",
""
],
[
"Kurizki",
"G.",
""
]
] |
0705.4178 | Ruan Qihua | Qihua Ruan | An Elliptic Type Gradient Estimate For the Schr\"{o}dinger Equation | null | null | null | null | math.DG math.AP | null | In this paper, the author discusses the elliptic type gradient estimate for
the solution of the time-dependent Schr\"{o}dinger equations on noncompact
manifolds. As its application, the dimension-free Harnack inequality and the
Liouville type theorem for the Schr\"{o}dinger equation are proved.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:54:03 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Ruan",
"Qihua",
""
]
] |
0705.4179 | Pierre Bieliavsky | Pierre Bieliavsky, Laurent Claessens, Daniel Sternheimer, Yannick
Voglaire | Quantized anti de Sitter spaces and non-formal deformation quantizations
of symplectic symmetric spaces | 24 pages, to appear in Contemporary Mathematics (AMS) in the volume
of the proceedings of the conference Poisson 2006 held at Keio Univ (Japan) | null | 10.1090/conm/450/08731 | null | math.QA math.SG | null | We realize quantized anti de Sitter space black holes, building Connes
spectral triples, similar to those used for quantized spheres but based on
Universal Deformation Quantization Formulas (UDF) obtained from an oscillatory
integral kernel on an appropriate symplectic symmetric space. More precisely we
first obtain a UDF for Lie subgroups acting on a symplectic symmetric space M
in a locally simply transitive manner. Then, observing that a curvature
contraction canonically relates anti de Sitter geometry to the geometry of
symplectic symmetric spaces, we use that UDF to define what we call
Dirac-isospectral noncommutative deformations of the spectral triples of
locally anti de Sitter black holes. The study is motivated by physical and
cosmological considerations.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:57:07 GMT"
}
] | 2015-07-27T00:00:00 | [
[
"Bieliavsky",
"Pierre",
""
],
[
"Claessens",
"Laurent",
""
],
[
"Sternheimer",
"Daniel",
""
],
[
"Voglaire",
"Yannick",
""
]
] |
0705.4180 | Spasimir Balev | Spasimir Balev | Search for direct CP-violation in K+- --> 3pi decays by NA48/2 | Talk given at XXXIII International Conference on High Energy Physics
(ICHEP'06), Moscow, Russia, July 26 - August 2, 2006 | null | 10.1142/9789812790873_0160 | null | hep-ex | null | A high precision search for direct CP-violation in K+- --> 3 pi decays was
performed by the NA48/2 experiment at CERN SPS. The asymmetry in the Dalitz
plot linear slopes A_g = (g^+ - g^-)/(g^+ + g^-) is measured to be A^c_g =
(-1.3 +- 2.3)x10^-4 by studying ~3.1x10^9 K+- --> pi+- pi+ pi- decays and A^n_g
= (2.1 +- 1.9)x10^-4 by studying ~91x10^6 K+- --> pi+- pi0 pi0 decays. The
unique double- beam system, the design of the detectors and the method of
analysis provide good control of the instrumental charge asymmetries and allow
to keep the precision of the result limited by statistics, reaching accuracy
one order of magnitude better than in previous experiments.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 09:58:51 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 09:11:28 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Balev",
"Spasimir",
""
]
] |
0705.4181 | Denis I. Borisov | D. Borisov | Asymptotics of the eigenvalues of elliptic systems with fast oscillating
coefficients | null | null | null | null | math.SP math-ph math.MP | null | We consider singularly perturbed second order elliptic system in the whole
space with fast oscillating coefficients. We construct the complete asymptotic
expansions for the eigenvalues converging to the isolated ones of the
homogenized system, as well as the complete asymptotic expansions for the
associated eigenfunctions.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:07:14 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Borisov",
"D.",
""
]
] |
0705.4182 | Jaros{\l}aw Paturej | Franco Ferrari, Jaroslaw Paturej, Thomas A. Vilgis | A path integral approach to the dynamics of a random chain with rigid
constraints | 36 pages, 2 figures, LaTeX + REVTeX4 + graphicx, minor changes in the
text, reference added | Phys. Rev. E 77, 021802 (2008) | 10.1103/PhysRevE.77.021802 | null | cond-mat.stat-mech | null | In this work the dynamics of a freely jointed random chain which fluctuates
at constant temperature in some viscous medium is studied. The chain is
regarded as a system of small particles which perform a brownian motion and are
subjected to rigid constraints which forbid the breaking of the chain. For
simplicity, all interactions among the particles have been switched off and the
number of dimensions has been limited to two. The problem of describing the
fluctuations of the chain in the limit in which it becomes a continuous system
is solved using a path integral approach, in which the constraints are imposed
with the insertion in the path integral of suitable Dirac delta functions. It
is shown that the probability distribution of the possible conformations in
which the fluctuating chain can be found during its evolution in time coincides
with the partition function of a field theory which is a generalization of the
nonlinear sigma model in two dimensions. Both the probability distribution and
the generating functional of the correlation functions of the positions of the
beads are computed explicitly in a semiclassical approximation for a
ring-shaped chain.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:08:29 GMT"
},
{
"version": "v2",
"created": "Tue, 13 Nov 2007 10:25:03 GMT"
},
{
"version": "v3",
"created": "Fri, 23 Nov 2007 09:40:04 GMT"
},
{
"version": "v4",
"created": "Wed, 27 Feb 2008 09:48:12 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ferrari",
"Franco",
""
],
[
"Paturej",
"Jaroslaw",
""
],
[
"Vilgis",
"Thomas A.",
""
]
] |
0705.4183 | Spasimir Balev | Spasimir Balev | Recent results from NA48 | Talk given at 21th Rencontres de Physique de La Vallee d'Aoste, La
Thuile, Aosta Valley, Italy, 4-10 Mar 2007 | FrascatiPhys.Ser.44:369-383,2007 | null | null | hep-ex | null | Recent results from the experiments NA48, NA48/1 and NA48/2 are presented,
including: direct CP-violation and Dalitz plot slopes measurements for K+- -->
3 pi decays; pi pi scattering effects in K+- --> pi+- pi0 pi0 and Ke4 decays,
as well as Ke4 form factors and branching fraction; measurements on radiative
charged kaons and hyperon decays, semileptonic decays of neutral and charged
kaons; KL --> pi+ pi- branching ratio and |eta+-| measurement; lepton
universality check with Kl2 decays.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:10:34 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 12:45:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Balev",
"Spasimir",
""
]
] |
0705.4184 | Liyun Hu | Fan Hongyi and Hu Liyun | Fresnel-transform's quantum correspondence and quantum optical ABCD Law | 6 pages and no figure | null | null | null | quant-ph | null | Corresponding to Fresnel transform there exists a unitary operator in quantum
optics theory, which could be named Fresnel operator (FO). We show that the
multiplication rule of FO naturally leads to the quantum optical ABCD law. The
canonical operator methods as mapping of ray-transfer ABCD matrix is explicitly
shown by FO's normally ordered expansion through the coherent state
representation and the technique of integration within an ordered product of
operators. We show that time evolution of the damping oscillator embodies the
quantum optical ABCD law.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:18:20 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Hongyi",
"Fan",
""
],
[
"Liyun",
"Hu",
""
]
] |
0705.4185 | Tony Thomas | Tony Thomas | Secure Two-party Protocols for Point Inclusion Problem | null | null | null | null | cs.CR | null | It is well known that, in theory, the general secure multi-party computation
problem is solvable using circuit evaluation protocols. However, the
communication complexity of the resulting protocols depend on the size of the
circuit that expresses the functionality to be computed and hence can be
impractical. Hence special solutions are needed for specific problems for
efficiency reasons. The point inclusion problem in computational geometry is a
special multiparty computation and has got many applications. Previous
protocols for the secure point inclusion problem are not adequate. In this
paper we modify some known solutions to the point inclusion problem in
computational geometry to the frame work of secure two-party computation.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:21:25 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Thomas",
"Tony",
""
]
] |
0705.4186 | Anatoliy Klimyk U. | A. Klimyk and J. Patera | (Anti)symmetric multivariate trigonometric functions and corresponding
Fourier transforms | 25 pages, no figures; LaTaX; corrected typos | J. Math. Phys., vol. 48 (2007), 093504, 24 pages | 10.1063/1.2779768 | null | math.CA math-ph math.MP | null | Four families of special functions, depending on n variables, are studied. We
call them symmetric and antisymmetric multivariate sine and cosine functions.
They are given as determinants or antideterminants of matrices, whose matrix
elements are sine or cosine functions of one variable each. These functions are
eigenfunctions of the Laplace operator, satisfying specific conditions at the
boundary of a certain domain F of the n-dimensional Euclidean space. Discrete
and continuous orthogonality on F of the functions within each family, allows
one to introduce symmetrized and antisymmetrized multivariate Fourier-like
transforms, involving the symmetric and antisymmetric multivariate sine and
cosine functions.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:32:06 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Dec 2007 16:17:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Klimyk",
"A.",
""
],
[
"Patera",
"J.",
""
]
] |
0705.4187 | Slawomir Wolski Mr | B. A. Danilchenko, I. A. Obukhov, T. Paszkiewicz, S. Wolski, A.
Jezowski | On the upper limit of thermal conductivity GaN crystals | 7 pages, 3 figures | null | 10.1016/j.ssc.2007.08.007 | null | cond-mat.mtrl-sci | null | The maximal value of thermal conductivity \kappa_{max} of the perfect wurzite
GaN crystal containing isotopes of natural abundance is estimated. Our upper
limit of \kappa=4800 W/Km at T_{max}=32 K is smaller than calculated by Liu and
Balandin \kappa=6000 W/Km and higher than obtained by Slack et al \kappa=3750
W/Km. The phenomenological dependence \kappa \propto T^{-1.43} obtained by Mion
et al for the temperature interval 300-450 K is extended to 200-300K. For
temperatures higher than T_max the best fitting of our experimental data to
Callaway's formula is obtained for Grueneisen's constant equal to \gamma =
1.35.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:34:06 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Jun 2007 08:07:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Danilchenko",
"B. A.",
""
],
[
"Obukhov",
"I. A.",
""
],
[
"Paszkiewicz",
"T.",
""
],
[
"Wolski",
"S.",
""
],
[
"Jezowski",
"A.",
""
]
] |
0705.4188 | Jacek Jurkowski | Andrzej Kossakowski, Rolando Rebolledo | On non-Markovian time evolution in open quantum systems | null | null | 10.1142/9789812793171_0012 | null | quant-ph | null | Non-Markovian reduced dynamics of an open system is investigated. In the case
the initial state of the reservoir is the vacuum state, an approximation is
introduced which makes possible to construct a reduced dynamics which is
completely positive.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:36:11 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Kossakowski",
"Andrzej",
""
],
[
"Rebolledo",
"Rolando",
""
]
] |
0705.4189 | Martial Mazars Dr. | Martial Mazars (Laboratoire de Physique Th\'eorique, Universite de
Paris, France) | Yukawa potentials in systems with partial periodic boundary conditions
II : Lekner sums for quasi-two dimensional systems | 25 pages, 5 figures and 1 table | Molecular Physics, 105 : 13, 1927-1936 (2007) | 10.1080/00268970701481724 | LPT-07-33 | cond-mat.soft | null | Yukawa potentials may be long ranged when the Debye screening length is
large. In computer simulations, such long ranged potentials have to be taken
into account with convenient algorithms to avoid systematic bias in the
sampling of the phase space. Recently, we have provided Ewald sums for
quasi-two dimensional systems with Yukawa interaction potentials [M. Mazars,
{\it J. Chem. Phys.}, {\bf 126}, 056101 (2007) and M. Mazars, {\it Mol. Phys.},
Paper I]. Sometimes, Lekner sums are used as an alternative to Ewald sums for
Coulomb systems. In the present work, we derive the Lekner sums for quasi-two
dimensional systems with Yukawa interaction potentials and we give some
numerical tests for pratical implementations. The main result of this paper is
to outline that Lekner sums cannot be considered as an alternative to Ewald
sums for Yukawa potentials. As a conclusion to this work : Lekner sums should
not be used for quasi-two dimensional systems with Yukawa interaction
potentials.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:37:38 GMT"
}
] | 2016-03-28T00:00:00 | [
[
"Mazars",
"Martial",
"",
"Laboratoire de Physique Théorique, Universite de\n Paris, France"
]
] |
0705.4190 | Wei Wang | Wei Wang | Closed geodesics on positively curved Finsler spheres | 41 pages. Revised version. To appear in Adv. Math | null | null | null | math.DG | null | In this paper, we prove that for every Finsler $n$-sphere $(S^n, F)$ for
$n\ge 3$ with reversibility $\lambda$ and flag curvature $K$ satisfying
$(\frac{\lambda}{\lambda+1})^2<K\le 1$, either there exist infinitely many
prime closed geodesics or there exists one elliptic closed geodesic whose
linearized Poincar\'e map has at least one eigenvalue which is of the form
$\exp(\pi i \mu)$ with an irrational $\mu$. Furthermore, there always exist
three prime closed geodesics on any $(S^3, F)$ satisfying the above pinching
condition.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:51:47 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Jan 2008 03:07:26 GMT"
},
{
"version": "v3",
"created": "Wed, 19 Mar 2008 11:08:03 GMT"
}
] | 2008-03-19T00:00:00 | [
[
"Wang",
"Wei",
""
]
] |
0705.4191 | Mikhail Kostylev | M.P.Kostylev, A.A.Serga, T.Schneider, B.Leven, B.Hillebrands and
R.L.Stamps | Resonant scattering of spin waves from a region of inhomogeneous
magnetic field in a ferromagnetic film | null | Phys. Rev. B 76, 184419 (2007) | 10.1103/PhysRevB.76.184419 | null | cond-mat.mtrl-sci | null | The transmission of a dipole-dominated spin wave in a ferromagnetic film
through a localised inhomogeneity in the form of a magnetic field produced by a
dc current through a wire placed on the film surface was studied experimentally
and theoretically. It was shown that the amplitude and phase of the transmitted
wave can be simultaneously affected by the current induced field, a feature
that will be relevant for logic based on spin wave transport.
The direction of the current creates either a barrier or well for spin wave
transmission. The main observation is that the current dependence of the
amplitude of the spin wave transmitted through the well inhomogeneity is
non-monotonic. The dependence has a minimum and an additional maximum. A theory
was constructed to clarify the nature of the maximum. It shows that the
transmission of spin waves through the inhomogeneity can be considered as a
scattering process and that the additional maximum is a scattering resonance.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 10:58:31 GMT"
}
] | 2009-03-05T00:00:00 | [
[
"Kostylev",
"M. P.",
""
],
[
"Serga",
"A. A.",
""
],
[
"Schneider",
"T.",
""
],
[
"Leven",
"B.",
""
],
[
"Hillebrands",
"B.",
""
],
[
"Stamps",
"R. L.",
""
]
] |
0705.4192 | Vasilii Gvaramadze | V.V.Gvaramadze | Separated before birth: pulsars B2020+28 and B2021+51 as the remnants of
runaway stars | 4 pages, 2 figures, accepted for publication in A&A Letters | Astron.Astrophys.470:L9-L12, 2007 | 10.1051/0004-6361:20077693 | null | astro-ph | null | Astrometric data on the pulsars B2020+28 and B2021+51 suggest that they
originated within several parsecs of each other in the direction of the Cyg OB2
association. It was proposed that the pulsars share their origin in a common
massive binary and were separated at the birth of the second pulsar following
the asymmetric supernova explosion. We consider a different scenario for the
origin of the pulsar pair based on a possibility that the pulsars were
separated before their birth and that they are the remnants of runaway stars
ejected (with velocities similar to those of the pulsars) from the core of Cyg
OB2 due to strong three- or four-body dynamical encounters. Our scenario does
not require any asymmetry in supernova explosions.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 11:05:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gvaramadze",
"V. V.",
""
]
] |
0705.4193 | Pieter Kok | Pieter Kok | Lecture notes on Optical Quantum Computing | 33 pages, 21 figures | Lecture Notes in Physics 787, 187 (2009) | 10.1007/978-3-642-02871-7_7 | null | quant-ph | null | A quantum computer is a machine that can perform certain calculations much
faster than a classical computer by using the laws of quantum mechanics.
Quantum computers do not exist yet, because it is extremely difficult to
control quantum mechanical systems to the necessary degree. What is more, we do
at this moment not know which physical system is the best suited for making a
quantum computer (although we have some ideas). It is likely that a mature
quantum information processing technology will use (among others) light,
because photons are ideal carriers for quantum information. These notes are an
expanded version of the five lectures I gave on the possibility of making a
quantum computer using light, at the Summer School in Theoretical Physics in
Durban, 14-24 January, 2007. There are quite a few proposals using light for
quantum computing, and I can highlight only a few here. I will focus on
photonic qubits, and leave out continuous variables completely. I assume that
the reader is familiar with basic quantum mechanics and introductory quantum
computing.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 11:08:58 GMT"
}
] | 2009-11-30T00:00:00 | [
[
"Kok",
"Pieter",
""
]
] |
0705.4194 | Jean-Claude Thomas JCT | Yves Felix and Jean-Claude Thomas | Rational BV-algebra in String Topology | null | null | null | null | math.AT math.CA | null | Let $M$ be a 1-connected closed manifold and $LM$ be the space of free loops
on $M$. In \cite{C-S} M. Chas and D. Sullivan defined a structure of BV-algebra
on the singular homology of $LM$, $H_\ast(LM; \bk)$. When the field of
coefficients is of characteristic zero, we prove that there exists a BV-algebra
structure on $\hH^\ast(C^\ast (M); C^\ast (M))$ which carries the canonical
structure of Gerstenhaber algebra. We construct then an isomorphism of
BV-algebras between $\hH^\ast (C^\ast (M); C^\ast (M)) $ and the shifted $
H_{\ast+m} (LM; {\bk})$. We also prove that the Chas-Sullivan product and the
BV-operator behave well with the Hodge decomposition of $H_\ast (LM) $.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 11:11:26 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Felix",
"Yves",
""
],
[
"Thomas",
"Jean-Claude",
""
]
] |
0705.4195 | Thomas Dall Dr. | T. H. Dall, C. Foellmi, J. Pritchard, G. Lo Curto, C. Allende Prieto,
H. Bruntt, P. J. Amado, T. Arentoft, M. Baes, E. Depagne, M. Fernandez, V.
Ivanov, L. Koesterke, L. Monaco, K. O'Brien, L. M. Sarro, I. Saviane, J.
Scharwaechter, L. Schmidtobreick, O. Schuetz, A. Seifahrt, F. Selman, M.
Stefanon, M. Sterzik | VSOP: The Variable Star One-shot Project I. Project presentation and
first data release | Accepted for publication in A&A | null | 10.1051/0004-6361:20077571 | null | astro-ph | null | The Variable Star One-shot Project (VSOP) is aimed at (1) providing the
variability type and spectral type of all unstudied variable stars, (2)
process, publish, and make the data available as automatically as possible, and
(3) generate serendipitous discoveries. This first paper describes the project
itself, the acquisition of the data, the dataflow, the spectroscopic analysis
and the on-line availability of the fully calibrated and reduced data. We also
present the results on the 221 stars observed during the first semester of the
project. We used the high-resolution echelle spectrographs HARPS and FEROS in
the ESO La Silla Observatory (Chile) to survey known variable stars. Once
reduced by the dedicated pipelines, the radial velocities are determined from
cross correlation with synthetic template spectra, and the spectral types are
determined by an automatic minimum distance matching to synthetic spectra, with
traditional manual spectral typing cross-checks. The variability types are
determined by manually evaluating the available light curves and the
spectroscopy. In the future, a new automatic classifier, currently being
developed by members of the VSOP team, based on these spectroscopic data and on
the photometric classifier developed for the COROT and Gaia space missions,
will be used. We confirm or revise spectral types of 221 variable stars from
the GCVS. We identify 26 previously unknown multiple systems, among them
several visual binaries with spectroscopic binary individual components. We
present new individual results for the multiple systems V349 Vel and BC Gru,
for the composite spectrum star V4385 Sgr, for the T-Tauri star V1045 Sco, and
for DM Boo which we re-classify as a BY Draconis variable. The complete data
release can be accessed via the VSOP web site.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 11:13:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dall",
"T. H.",
""
],
[
"Foellmi",
"C.",
""
],
[
"Pritchard",
"J.",
""
],
[
"Curto",
"G. Lo",
""
],
[
"Prieto",
"C. Allende",
""
],
[
"Bruntt",
"H.",
""
],
[
"Amado",
"P. J.",
""
],
[
"Arentoft",
"T.",
""
],
[
"Baes",
"M.",
""
],
[
"Depagne",
"E.",
""
],
[
"Fernandez",
"M.",
""
],
[
"Ivanov",
"V.",
""
],
[
"Koesterke",
"L.",
""
],
[
"Monaco",
"L.",
""
],
[
"O'Brien",
"K.",
""
],
[
"Sarro",
"L. M.",
""
],
[
"Saviane",
"I.",
""
],
[
"Scharwaechter",
"J.",
""
],
[
"Schmidtobreick",
"L.",
""
],
[
"Schuetz",
"O.",
""
],
[
"Seifahrt",
"A.",
""
],
[
"Selman",
"F.",
""
],
[
"Stefanon",
"M.",
""
],
[
"Sterzik",
"M.",
""
]
] |
0705.4196 | Michael Fitzgerald | Michael P. Fitzgerald, Paul G. Kalas, Gaspard Duchene, Christophe
Pinte, and James R. Graham | The AU Microscopii Debris Disk: Multiwavelength Imaging and Modeling | ApJ accepted, 56 pages, preprint style. Version in emulateapj with
high-resolution figures available at http://tinyurl.com/y6ent7 | null | 10.1086/521344 | null | astro-ph | null | (abridged) Debris disks around main sequence stars are produced by the
erosion and evaporation of unseen parent bodies. AU Microscopii (GJ 803) is a
compelling object to study in the context of disk evolution across different
spectral types, as it is an M dwarf whose near edge-on disk may be directly
compared to that of its A5V sibling beta Pic. We resolve the disk from 8-60 AU
in the near-IR JHK' bands at high resolution with the Keck II telescope and
adaptive optics, and develop a novel data reduction technique for the removal
of the stellar point spread function. The point source detection sensitivity in
the disk midplane is more than a magnitude less sensitive than regions away
from the disk for some radii. We measure a blue color across the near-IR bands,
and confirm the presence of substructure in the inner disk. Some of the
structural features exhibit wavelength-dependent positions. The disk
architecture and characteristics of grain composition are inferred through
modeling. We approach the modeling of the dust distribution in a manner that
complements previous work. Using a Monte Carlo radiative transfer code, we
compare a relatively simple model of the distribution of porous grains to a
broad data set, simultaneously fitting to midplane surface brightness profiles
and the spectral energy distribution. Our model confirms that the large-scale
architecture of the disk is consistent with detailed models of steady-state
grain dynamics. Here, a belt of parent bodies from 35-40 AU is responsible for
producing dust that is then swept outward by the stellar wind and radiation
pressures. We infer the presence of very small grains in the outer region, down
to sizes of ~0.05 micron. These sizes are consistent with stellar mass-loss
rates Mdot_* << 10^2 Mdot_sun.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 11:27:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fitzgerald",
"Michael P.",
""
],
[
"Kalas",
"Paul G.",
""
],
[
"Duchene",
"Gaspard",
""
],
[
"Pinte",
"Christophe",
""
],
[
"Graham",
"James R.",
""
]
] |
0705.4197 | Morihiko Saito | Alexandru Dimca, Philippe Maisonobe, Morihiko Saito | Spectrum and multiplier ideals of arbitrary subvarieties | 17 pages | null | null | null | math.AG | null | We introduce a spectrum for arbitrary varieties. This generalizes the
definition by Steenbrink for hypersurfaces. In the isolated complete
intersection singularity case, it coincides with the one given by Ebeling and
Steenbrink except for the coefficients of integral exponents. We show a
relation to the graded pieces of the multiplier ideals by using a relation to
the filtration $V$ of Kashiwara and Malgrange. This implies a partial
generalization of a theorem of Budur in the hypersurface case. The point is to
consider the direct sum of the graded pieces of the multiplier ideals as a
module over the algebra defining the normal cone of the subvariety. We also
give a combinatorial description in the case of monomial ideals.
| [
{
"version": "v1",
"created": "Tue, 29 May 2007 11:42:39 GMT"
}
] | 2007-05-30T00:00:00 | [
[
"Dimca",
"Alexandru",
""
],
[
"Maisonobe",
"Philippe",
""
],
[
"Saito",
"Morihiko",
""
]
] |
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