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802.1503 | Nais Coq | Na\"is Coq (PMMH), Olivia Du Roure (PMMH), Joel Marthelot (PMMH),
Denis Bartolo (PMMH), Marc Fermigier (PMMH) | Rotational dynamics of a soft filament: wrapping transition and
propulsive forces | null | null | 10.1063/1.2909603 | null | physics.flu-dyn cond-mat.soft | null | We analyze experimentally the shape of a long elastic filament rotating in a
viscous liquid. We identify a continuous but sharp transition from a straight
to an helical shape, resulting from the competition between viscous stresses
and elastic forces. This induced helicity generates a propulsive force along
the axis of rotation. In addition, we show that the shape transition is
associated with an unstable branch in the force-torque relation. A linearized
model of the fluid-structure interaction is proposed to account for all the
features of the non-linear filament dynamics.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:05:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Coq",
"Naïs",
"",
"PMMH"
],
[
"Roure",
"Olivia Du",
"",
"PMMH"
],
[
"Marthelot",
"Joel",
"",
"PMMH"
],
[
"Bartolo",
"Denis",
"",
"PMMH"
],
[
"Fermigier",
"Marc",
"",
"PMMH"
]
] | [
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802.1504 | Davide Sarchi | Davide Sarchi and Vincenzo Savona | Thermodynamics and linear response of a Bose-Einstein condensate of
microcavity polaritons | 9 pages, 4 figures | null | 10.1002/pssc.200777604 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | In this work we derive a theory of polariton condensation based on the theory
of interacting Bose particles. In particular, we describe self-consistently the
linear exciton-photon coupling and the exciton-nonlinearities, by generalizing
the Hartree-Fock-Popov description of BEC to the case of two coupled Bose
fields at thermal equilibrium. In this way, we compute the density-dependent
one-particle spectrum, the energy occupations and the phase diagram. The
results quantitatively agree with the existing experimental findings. We then
present the equations for the linear response of a polariton condensate and we
predict the spectral response of the system to external optical or mechanical
perturbations.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:06:55 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 11:33:34 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Sarchi",
"Davide",
""
],
[
"Savona",
"Vincenzo",
""
]
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] |
802.1505 | Andrey Leznov | A.N.Leznov | Solution of symmetry equation and hierarchy of self dual Yang-Mills
systems | 5 pages,no figures | null | null | null | hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The solution of symmetry equation of Yang-Mills self dual system is found in
explicit form of its raising Hamiltonian operator. Thus explicit form of
equations of self dual Yang Mills hierarchy is constructed.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:21:31 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Leznov",
"A. N.",
""
]
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] |
802.1506 | Sergio Caracciolo | Andrea Bedini, Sergio Caracciolo, Andrea Sportiello | Hyperforests on the Complete Hypergraph by Grassmann Integral
Representation | 35 pages | J.Phys.A41:205003,2008 | 10.1088/1751-8113/41/20/205003 | null | math-ph cond-mat.stat-mech hep-lat math.CO math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the generating function of rooted and unrooted hyperforests in a
general complete hypergraph with n vertices by using a novel Grassmann
representation of their generating functions. We show that this new approach
encodes the known results about the exponential generating functions for the
different number of vertices. We consider also some applications as counting
hyperforests in the k-uniform complete hypergraph and the one complete in
hyperedges of all dimensions. Some general feature of the asymptotic regimes
for large number of connected components is discussed.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:30:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bedini",
"Andrea",
""
],
[
"Caracciolo",
"Sergio",
""
],
[
"Sportiello",
"Andrea",
""
]
] | [
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802.1507 | Lucas Wanex | Lucas Wanex and Erik Tendeland | Sheared Flow As A Stabilizing Mechanism In Astrophysical Jets | 13 pages, 2 figures | Astrophys.Space Sci.307:83-86,2007 | 10.1007/s10509-006-9250-5 | null | astro-ph | null | It has been hypothesized that the sustained narrowness observed in the
asymptotic cylindrical region of bipolar outflows from Young Stellar Objects
(YSO) indicates that these jets are magnetically collimated. The j cross B
force observed in z-pinch plasmas is a possible explanation for these
observations. However, z-pinch plasmas are subject to current driven
instabilities (CDI). The interest in using z-pinches for controlled nuclear
fusion has lead to an extensive theory of the stability of magnetically
confined plasmas. Analytical, numerical, and experimental evidence from this
field suggest that sheared flow in magnetized plasmas can reduce the growth
rates of the sausage and kink instabilities. Here we propose the hypothesis
that sheared helical flow can exert a similar stabilizing influence on CDI in
YSO jets.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:31:14 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 21:43:16 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Wanex",
"Lucas",
""
],
[
"Tendeland",
"Erik",
""
]
] | [
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] |
802.1508 | Michele Levi | Michele Levi | Next-to-leading order gravitational spin1-spin2 coupling with
Kaluza-Klein reduction | 12 pages, revtex4-1, 3 figures; v2: reference added; v3: edited,
section 3 elaborated; v4: published | Phys.Rev.D82:064029,2010 | 10.1103/PhysRevD.82.064029 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the recently proposed Kaluza-Klein (KK) reduction over the time
dimension, within an effective field theory (EFT) approach, to calculate the
next to leading order (NLO) gravitational spin1-spin2 interaction between two
spinning compact objects. It is shown here that to NLO in the spin1-spin2
interaction, the reduced KK action within the stationary approximation is
sufficient to describe the gravitational interaction, and that it simplifies
calculation substantially. We also find here that the gravito-magnetic vector
field defined within the KK decomposition of the metric mostly dominates the
mediation of the interaction. Our results coincide with those calculated in the
ADM Hamiltonian formalism, and we provide another explanation for the
discrepancy with the result previously derived within the EFT approach, thus
demonstrating clearly the equivalence of the ADM Hamiltonian formalism and the
EFT action approach.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:32:19 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Feb 2008 12:49:48 GMT"
},
{
"version": "v3",
"created": "Fri, 16 Jul 2010 13:10:00 GMT"
},
{
"version": "v4",
"created": "Fri, 24 Sep 2010 22:36:38 GMT"
}
] | 2010-12-02T00:00:00 | [
[
"Levi",
"Michele",
""
]
] | [
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] |
802.1509 | John H. Palmieri | W. G. Dwyer, J. H. Palmieri | The Bousfield lattice for truncated polynomial algebras | null | null | null | null | math.AT math.AC | null | The global structure of the unbounded derived category of a truncated
polynomial ring on countably many generators is investigated, via its Bousfield
lattice. The Bousfield lattice is shown to have cardinality larger than that of
the real numbers, and objects with large tensor-nilpotence height are
constructed.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:26:55 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Dwyer",
"W. G.",
""
],
[
"Palmieri",
"J. H.",
""
]
] | [
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] |
802.151 | Rafael A. Garcia | R.A. Garcia, S. Mathur, J. Ballot, A. Eff-Darwich, S.J. Jimenez-Reyes,
S.G. Korzennik | Influence of Low-Degree High-Order p-Mode Splittings on the Solar
Rotation Profile | Accepted for publication in Solar Physics. 17 Pages, 9 figures | null | 10.1007/s11207-008-9144-5 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The solar rotation profile is well constrained down to about 0.25 R thanks to
the study of acoustic modes. Since the radius of the inner turning point of a
resonant acoustic mode is inversely proportional to the ratio of its frequency
to its degree, only the low-degree p modes reach the core. The higher the order
of these modes, the deeper they penetrate into the Sun and thus they carry more
diagnostic information on the inner regions. Unfortunately, the estimates of
frequency splittings at high frequency from Sun-as-a-star measurements have
higher observational errors due to mode blending, resulting in weaker
constraints on the rotation profile in the inner core. Therefore inversions for
the solar internal rotation use only modes below 2.4 mHz for l < 4. In the work
presented here, we used an 11.5 year-long time series to compute the rotational
frequency splittings for modes l < 4 using velocities measured with the GOLF
instrument. We carried out a theoretical study of the influence of the
low-degree modes in the region 2 to 3.5 mHz on the inferred rotation profile as
a function of their error bars.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:38:58 GMT"
}
] | 2008-04-01T00:00:00 | [
[
"Garcia",
"R. A.",
""
],
[
"Mathur",
"S.",
""
],
[
"Ballot",
"J.",
""
],
[
"Eff-Darwich",
"A.",
""
],
[
"Jimenez-Reyes",
"S. J.",
""
],
[
"Korzennik",
"S. G.",
""
]
] | [
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] |
802.1511 | Robert McDermott | S. Sendelbach, D. Hover, A. Kittel, M. M\"uck, John M. Martinis, and
R. McDermott | Calculations for Magnetism in SQUIDs at Millikelvin Temperatures | 5 pages, 5 figures; added details of device fabrication | null | null | null | cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we present details of a calculation that allows us to extract a surface
density of unpaired spins from flux vs. temperature experiments performed on
field-cooled dc Superconducting QUantum Interference Devices (dc SQUIDs).
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:42:23 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Feb 2008 20:54:56 GMT"
},
{
"version": "v3",
"created": "Fri, 28 Mar 2008 04:52:46 GMT"
}
] | 2008-03-28T00:00:00 | [
[
"Sendelbach",
"S.",
""
],
[
"Hover",
"D.",
""
],
[
"Kittel",
"A.",
""
],
[
"Mück",
"M.",
""
],
[
"Martinis",
"John M.",
""
],
[
"McDermott",
"R.",
""
]
] | [
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] |
802.1512 | J\'er\^ome B\"urki | J. B\"urki, C. A. Stafford and D. L. Stein | The Order of Phase Transitions in Barrier Crossing | 8 pages, 6 figures with extended introduction and discussion; version
accepted for publication by Phys. Rev. E | Phys. Rev. E 77, 061115 (2008) | 10.1103/PhysRevE.77.061115 | null | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spatially extended classical system with metastable states subject to weak
spatiotemporal noise can exhibit a transition in its activation behavior when
one or more external parameters are varied. Depending on the potential, the
transition can be first or second-order, but there exists no systematic theory
of the relation between the order of the transition and the shape of the
potential barrier. In this paper, we address that question in detail for a
general class of systems whose order parameter is describable by a classical
field that can vary both in space and time, and whose zero-noise dynamics are
governed by a smooth polynomial potential. We show that a quartic potential
barrier can only have second-order transitions, confirming an earlier
conjecture [1]. We then derive, through a combination of analytical and
numerical arguments, both necessary conditions and sufficient conditions to
have a first-order vs. a second-order transition in noise-induced activation
behavior, for a large class of systems with smooth polynomial potentials of
arbitrary order. We find in particular that the order of the transition is
especially sensitive to the potential behavior near the top of the barrier.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:46:42 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Apr 2008 17:00:43 GMT"
}
] | 2008-07-09T00:00:00 | [
[
"Bürki",
"J.",
""
],
[
"Stafford",
"C. A.",
""
],
[
"Stein",
"D. L.",
""
]
] | [
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] |
802.1513 | Lauro Barbosa | Jafferson K. L. da Silva and Lauro A. Barbosa | Non-universal Interspecific Allometric Scaling of Metabolism | no figures, 3 tables | null | null | null | physics.bio-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend a previously theory for the interspecific allometric scaling
developed in a $d+1$-dimensional space of metabolic states. The time, which is
characteristic of all biological processes, is included as an extra dimension
to $d$ biological lengths. The different metabolic rates, such as basal (BMR)
and maximum (MMR), are described by supposing that the biological lengths and
time are related by different transport processes of energy and mass.
We consider that the metabolic rates of animals are controlled by three main
transport processes: convection, diffusion and anomalous diffusion. Different
transport mechanisms are related to different metabolic states, with its own
values for allometric exponents. In $d=3$, we obtain that the exponent $b$ of
BMR is $b=0.71$, and that the aerobic sustained MMR upper value of the exponent
is $b=0.86$ (best empirical values for mammals: $b=0.69(2)$ and $b=0.87(3)$).
The 3/4-law appears as an upper limit of BMR. The MMR scaling in different
conditions, other exponents related to BMR and MMR, and the metabolism of
unicellular organisms are also discussed.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:48:00 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"da Silva",
"Jafferson K. L.",
""
],
[
"Barbosa",
"Lauro A.",
""
]
] | [
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] |
802.1514 | Konstantin Kobylkin S. | K.S. Kobylkin | Minimal Committee Problem for Inconsistent Systems of Linear
Inequalities on the Plane | 29 pages, 2 figures | null | 10.1134/S1054661806040201 | null | cs.DM cs.CG | null | A representation of an arbitrary system of strict linear inequalities in R^n
as a system of points is proposed. The representation is obtained by using a
so-called polarity. Based on this representation an algorithm for constructing
a committee solution of an inconsistent plane system of linear inequalities is
given. A solution of two problems on minimal committee of a plane system is
proposed. The obtained solutions to these problems can be found by means of the
proposed algorithm.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:50:56 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 07:40:17 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Feb 2008 17:15:03 GMT"
}
] | 2008-02-15T00:00:00 | [
[
"Kobylkin",
"K. S.",
""
]
] | [
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] |
802.1515 | Valeria Pettorino | D. F. Mota, V. Pettorino, G. Robbers, C. Wetterich | Neutrino clustering in growing neutrino quintessence | 6 pages, 5 figures | Phys.Lett.B663:160-164,2008 | 10.1016/j.physletb.2008.03.060 | null | astro-ph | null | A growing neutrino mass can stop the dynamical evolution of a dark energy
scalar field, thus explaining the 'why now' problem. We show that such models
lead to a substantial neutrino clustering on the scales of superclusters.
Nonlinear neutrino lumps form at redshift z \sim 1 and could partially drag the
clustering of dark matter. If observed, large scale non-linear structures could
be an indication for a new attractive 'cosmon force' stronger than gravity.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:04:09 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Mota",
"D. F.",
""
],
[
"Pettorino",
"V.",
""
],
[
"Robbers",
"G.",
""
],
[
"Wetterich",
"C.",
""
]
] | [
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] |
802.1516 | Ophir Flomenbom | O. Flomenbom, A. Taloni | On single file and less dense processes | null | Europhys. Lett. 83, 20004-p1-p6 (2008) | 10.1209/0295-5075/83/20004 | null | cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The diffusion process of N hard rods in a 1D interval of length L (--> inf)
is studied using scaling arguments and an asymptotic analysis of the exact
N-particle probability density function (PDF). In the class of such systems,
the universal scaling law of the tagged particle's mean absolute displacement
reads, <|r|>~ <|r|>_{free}/n^mu, where <|r|>_{free} is the result for a free
particle in the studied system and n is the number of particles in the covered
length. The exponent mu is given by, mu=1/(1+a), where a is associated with the
particles' density law of the system, rho~rho_0*L^(-a), 0<= a <=1. The scaling
law for <|r|> leads to, <|r|>~rho_0^((a-1)/2) (<|r| >_{free})^((1+a)/2), an
equation that predicts a smooth interpolation between single file diffusion and
free particle diffusion depending on the particles' density law, and holds for
any underlying dynamics. In particular, <|r|>~t^((1+a)/2) for normal diffusion,
with a Gaussian PDF in space for any value of a (deduced by a complementary
analysis), and, <|r|>~t^((beta(1+a))/2), for anomalous diffusion in which the
system's particles all have the same power-law waiting time PDF for individual
events, psi~t^(-1-beta), 0<beta<1. Our analysis shows that the scaling
<|r|>~t^(1/2) in a 'standard' single file is a direct result of the fixed
particles' density condition imposed on the system, a=0.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:59:46 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jul 2008 04:58:42 GMT"
}
] | 2010-08-16T00:00:00 | [
[
"Flomenbom",
"O.",
""
],
[
"Taloni",
"A.",
""
]
] | [
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] |
802.1517 | Han Liu | Han Liu, Jian Zhang | On the $\ell_1-\ell_q$ Regularized Regression | 25 pages | null | null | null | stat.ML math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider the problem of grouped variable selection in
high-dimensional regression using $\ell_1-\ell_q$ regularization ($1\leq q \leq
\infty$), which can be viewed as a natural generalization of the
$\ell_1-\ell_2$ regularization (the group Lasso). The key condition is that the
dimensionality $p_n$ can increase much faster than the sample size $n$, i.e.
$p_n \gg n$ (in our case $p_n$ is the number of groups), but the number of
relevant groups is small. The main conclusion is that many good properties from
$\ell_1-$regularization (Lasso) naturally carry on to the $\ell_1-\ell_q$ cases
($1 \leq q \leq \infty$), even if the number of variables within each group
also increases with the sample size. With fixed design, we show that the whole
family of estimators are both estimation consistent and variable selection
consistent under different conditions. We also show the persistency result with
random design under a much weaker condition. These results provide a unified
treatment for the whole family of estimators ranging from $q=1$ (Lasso) to
$q=\infty$ (iCAP), with $q=2$ (group Lasso)as a special case. When there is no
group structure available, all the analysis reduces to the current results of
the Lasso estimator ($q=1$).
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:00:55 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Liu",
"Han",
""
],
[
"Zhang",
"Jian",
""
]
] | [
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] |
802.1518 | Robert McDermott | S. Sendelbach, D. Hover, A. Kittel, M. M\"uck, John M. Martinis, and
R. McDermott | Magnetism in SQUIDs at Millikelvin Temperatures | 4 pages, 4 figures | null | 10.1103/PhysRevLett.100.227006 | null | cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have characterized the temperature dependence of the flux threading dc
SQUIDs cooled to millikelvin temperatures. The flux increases as 1/T as
temperature is lowered; moreover, the flux change is proportional to the
density of trapped vortices. The data is compatible with the thermal
polarization of surface spins in the trapped fields of the vortices. In the
absence of trapped flux, we observe evidence of spin-glass freezing at low
temperature. These results suggest an explanation for the "universal" 1/f flux
noise in SQUIDs and superconducting qubits.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:03:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sendelbach",
"S.",
""
],
[
"Hover",
"D.",
""
],
[
"Kittel",
"A.",
""
],
[
"Mück",
"M.",
""
],
[
"Martinis",
"John M.",
""
],
[
"McDermott",
"R.",
""
]
] | [
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] |
802.1519 | Piercarlo Bonifacio | S.M. Andrievsky (GEPI), M. Spite (GEPI), S.A. Korotin, F. Spite
(GEPI), P. Bonifacio (GEPI, Cifist, Inaf - Osservatorio Astronomico Di
Trieste), R. Cayrel (GEPI), V. Hill (GEPI), P. Fran\c{c}ois (GEPI) | NLTE determination of the aluminium abundance in a homogeneous sample of
extremely metal-poor stars | To be published on A&A | null | 10.1051/0004-6361:20078837 | null | astro-ph | null | Aims: Aluminium is a key element to constrain the models of the chemical
enrichment and the yields of the first supernovae. But obtaining precise Al
abundances in extremely metal-poor (EMP) stars requires that the non-LTE
effects be carefully taken into account.
Methods: The NLTE profiles of the blue resonance aluminium lines have been
computed in a sample of 53 extremely metal-poor stars with a modified version
of the program MULTI applied to an atomic model of the Al atom with 78 levels
of Al I and 13 levels of Al II, and compared to the observations.
Results: With these new determinations, all the stars of the sample show a
ratio Al/Fe close to the solar value: [Al/Fe] =-0.06 +- 0.10 with a very small
scatter. These results are compared to the models of the chemical evolution of
the halo using different models of SN II and are compatible with recent
computations. The sodium-rich giants are not found to be also aluminium-rich
and thus, as expected, the convection in these giants only brings to the
surface the products of the Ne-Na cycle.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:06:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Andrievsky",
"S. M.",
"",
"GEPI"
],
[
"Spite",
"M.",
"",
"GEPI"
],
[
"Korotin",
"S. A.",
"",
"GEPI"
],
[
"Spite",
"F.",
"",
"GEPI"
],
[
"Bonifacio",
"P.",
"",
"GEPI, Cifist, Inaf - Osservatorio Astronomico Di\n Trieste"
],
[
"Cayrel",
"R.",
"",
"GEPI"
],
[
"Hill",
"V.",
"",
"GEPI"
],
[
"François",
"P.",
"",
"GEPI"
]
] | [
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] |
802.152 | Ophir Flomenbom | O. Flomenbom, and R. J. Silbey | Toolbox for analyzing finite two-state trajectories | null | Phys. Rev. E 78, 066105 (2008) | 10.1103/PhysRevE.78.066105 | null | q-bio.QM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In many experiments, the aim is to deduce an underlying multi-substate on-off
kinetic scheme (KS) from the statistical properties of a two-state trajectory.
However, the mapping of a KS into a two-state trajectory leads to the loss of
information about the KS, and so, in many cases, more than one KS can be
associated with the data. We recently showed that the optimal way to solve this
problem is to use canonical forms of reduced dimensions (RD). RD forms are
on-off networks with connections only between substates of different states,
where the connections can have non-exponential waiting time probability density
functions (WT-PDFs). In theory, only a single RD form can be associated with
the data. To utilize RD forms in the analysis of the data, a RD form should be
associated with the data. Here, we give a toolbox for building a RD form from a
finite two-state trajectory. The methods in the toolbox are based on known
statistical methods in data analysis, combined with statistical methods and
numerical algorithms designed specifically for the current problem. Our toolbox
is self-contained - it builds a mechanism based only on the information it
extracts from the data, and its implementation on the data is fast (analyzing a
10^6 cycle trajectory from a thirty-parameter mechanism takes a couple of hours
on a PC with a 2.66 GHz processor). The toolbox is automated and is freely
available for academic research upon electronic request.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:07:26 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Oct 2008 23:31:58 GMT"
},
{
"version": "v3",
"created": "Thu, 25 Dec 2008 03:07:42 GMT"
}
] | 2010-08-16T00:00:00 | [
[
"Flomenbom",
"O.",
""
],
[
"Silbey",
"R. J.",
""
]
] | [
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] |
802.1521 | Stephanie Allassonniere | St\'ephanie Allassonni\`ere (CMAP), Estelle Kuhn (LAGA) | Stochastic Algorithm For Parameter Estimation For Dense Deformable
Template Mixture Model | null | null | null | null | stat.CO math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Estimating probabilistic deformable template models is a new approach in the
fields of computer vision and probabilistic atlases in computational anatomy. A
first coherent statistical framework modelling the variability as a hidden
random variable has been given by Allassonni\`ere, Amit and Trouv\'e in [1] in
simple and mixture of deformable template models. A consistent stochastic
algorithm has been introduced in [2] to face the problem encountered in [1] for
the convergence of the estimation algorithm for the one component model in the
presence of noise. We propose here to go on in this direction of using some
"SAEM-like" algorithm to approximate the MAP estimator in the general Bayesian
setting of mixture of deformable template model. We also prove the convergence
of this algorithm toward a critical point of the penalised likelihood of the
observations and illustrate this with handwritten digit images.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:08:27 GMT"
},
{
"version": "v2",
"created": "Fri, 16 Jan 2009 15:48:38 GMT"
}
] | 2009-01-16T00:00:00 | [
[
"Allassonnière",
"Stéphanie",
"",
"CMAP"
],
[
"Kuhn",
"Estelle",
"",
"LAGA"
]
] | [
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] |
802.1522 | Nevin N. Weinberg | Nevin N. Weinberg, Eliot Quataert (UC Berkeley) | Nonlinear Saturation of g-modes in Proto-Neutron Stars: Quieting the
Acoustic Engine | 6 pages, 3 figures, fixed minor typos, matches version published in
MNRAS Letters | Mon. Not. Roy. Astron. Soc. 387 (2008) L64-68 | 10.1111/j.1745-3933.2008.00486.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to Burrows et al.'s acoustic mechanism for core-collapse supernova
explosions, the primary, l=1, g-mode in the core of the proto-neutron star is
excited to an energy of ~ 10^{50} ergs and damps by the emission of sound
waves. Here we calculate the damping of the primary mode by the parametric
instability, i.e., by nonlinear, 3-mode coupling between the low-order primary
mode and pairs of high-order g-modes. We show that the primary mode is strongly
coupled to highly resonant, neutrino damped pairs with n>10; such short
wavelength interactions cannot be resolved in the simulations. We find that the
parametric instability saturates the primary mode energy at ~10^{48} ergs, well
below the energy needed to drive an explosion. We therefore conclude that
acoustic power is unlikely to be energetically significant in core-collapse
supernova explosions.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 18:07:17 GMT"
},
{
"version": "v2",
"created": "Sun, 20 Apr 2008 19:07:17 GMT"
},
{
"version": "v3",
"created": "Fri, 13 Jun 2008 01:00:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Weinberg",
"Nevin N.",
"",
"UC Berkeley"
],
[
"Quataert",
"Eliot",
"",
"UC Berkeley"
]
] | [
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] |
802.1523 | Troels Haugb{\o}lle | Juan Garcia-Bellido, Troels Haugboelle | Confronting Lemaitre-Tolman-Bondi models with Observational Cosmology | 27 pages, 8 figures. A general Fortran program for comparing LTB
models with cosmological observations, that has been used to make the
parameter scan in this paper is made public, and can be downloaded at
http://www.phys.au.dk/~haugboel/software.shtml . Added references, match
published version | JCAP 0804:003,2008 | 10.1088/1475-7516/2008/04/003 | IFT-UAM/CSIC-08-03 | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility that we live in a special place in the universe, close to the
centre of a large void, seems an appealing alternative to the prevailing
interpretation of the acceleration of the universe in terms of a LCDM model
with a dominant dark energy component. In this paper we confront the
asymptotically flat Lemaitre-Tolman-Bondi (LTB) models with a series of
observations, from Type Ia Supernovae to Cosmic Microwave Background and Baryon
Acoustic Oscillations data. We propose two concrete LTB models describing a
local void in which the only arbitrary functions are the radial dependence of
the matter density Omega_M and the Hubble expansion rate H. We find that all
observations can be accommodated within 1 sigma, for our models with 4 or 5
independent parameters. The best fit models have a chi^2 very close to that of
the LCDM model. We perform a simple Bayesian analysis and show that one cannot
exclude the hypothesis that we live within a large local void of an otherwise
Einstein-de Sitter model.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 16:22:41 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 17:08:01 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Aug 2008 15:40:59 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Garcia-Bellido",
"Juan",
""
],
[
"Haugboelle",
"Troels",
""
]
] | [
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802.1524 | Philip Armitage | Philip J. Armitage | Eccentricity of masing disks in Active Galactic Nuclei | ApJ, submitted | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations of Keplerian disks of masers in NCG 4258 and other Seyfert
galaxies can be used to obtain geometric distance estimates and derive the
Hubble constant. The ultimate precision of such measurements could be limited
by uncertainties in the disk geometry. Using a time-dependent linear theory
model, we study the evolution of a thin initially eccentric disk under
conditions appropriate to sub-pc scales in Active Galactic Nuclei. The
evolution is controlled by a combination of differential precession driven by
the disk potential and propagating eccentricity waves that are damped by
viscosity. A simple estimate yields a circularization timescale of
approximately 10 Myr at 0.1 pc. Numerical solutions for the eccentricity
evolution confirm that damping commences on this timescale, but show that the
subsequent decay rate of the eccentricity depends upon the uncertain strength
of viscous damping of eccentricity. If eccentricity waves are important further
decay of the eccentricity can be slow, with full circularization requiring up
to 50 Myr for disks at radii of 0.1 pc to 0.2 pc. Observationally, this implies
that it is plausible that enough time has elapsed for the eccentricity of
masing disks to have been substantially damped, but that it may not be
justified to assume vanishing eccentricity. We predict that during the damping
phase the pericenter of the eccentric orbits describes a moderately tightly
wound spiral with radius.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:00:05 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Armitage",
"Philip J.",
""
]
] | [
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802.1525 | Angelica de Oliveira-Costa | Angelica de Oliveira-Costa (MIT), Max Tegmark (MIT), B. M. Gaensler
(Sydney), Justin Jonas (Rhodes), T. L. Landecker (DRAO), Patricia Reich
(MPIfR) | A model of diffuse Galactic Radio Emission from 10 MHz to 100 GHz | Accuracy improved with 5-year WMAP data. Our data, software and new
foreground-cleaned WMAP map are available at https://ascl.net/1011.010 | null | 10.1111/j.1365-2966.2008.13376.x | null | astro-ph | null | Understanding diffuse Galactic radio emission is interesting both in its own
right and for minimizing foreground contamination of cosmological measurements.
Cosmic Microwave Background experiments have focused on frequencies > 10 GHz,
whereas 21 cm tomography of the high redshift universe will mainly focus on <
0.2 GHz, for which less is currently known about Galactic emission. Motivated
by this, we present a global sky model derived from all publicly available
total power large-area radio surveys, digitized with optical character
recognition when necessary and compiled into a uniform format, as well as the
new Villa Elisa data extending the 1.4 GHz map to the entire sky. We quantify
statistical and systematic uncertainties in these surveys by comparing them
with various global multi-frequency model fits. We find that a principal
component based model with only three components can fit the 11 most accurate
data sets (at 10, 22, 45 & 408 MHz and 1.4, 2.3, 23, 33, 41, 61, 94 GHz) to an
accuracy around 1%-10% depending on frequency and sky region. Both our data
compilation and our software returning a predicted all-sky map at any frequency
from 10 MHz to 100 GHz are publicly available at
http://space.mit.edu/home/angelica/gsm .
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 20:36:52 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 06:21:21 GMT"
},
{
"version": "v3",
"created": "Tue, 25 Mar 2008 02:24:26 GMT"
}
] | 2019-05-30T00:00:00 | [
[
"de Oliveira-Costa",
"Angelica",
"",
"MIT"
],
[
"Tegmark",
"Max",
"",
"MIT"
],
[
"Gaensler",
"B. M.",
"",
"Sydney"
],
[
"Jonas",
"Justin",
"",
"Rhodes"
],
[
"Landecker",
"T. L.",
"",
"DRAO"
],
[
"Reich",
"Patricia",
"",
"MPIfR"
]
] | [
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802.1526 | Jacob D. Bekenstein | Jacob D. Bekenstein and Eva Sagi | Do Newton's G and Milgrom's a_0 vary with cosmological epoch ? | 9 pages, RevTex | Phys.Rev.D77:103512,2008 | 10.1103/PhysRevD.77.103512 | null | astro-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the scalar tensor gravitational theories Newton's constant G_N evolves in
the expanding universe. Likewise, it has been speculated that the acceleration
scale a_0 in Milgrom's modified Newtonian dynamics (MOND) is tied to the scale
of the cosmos, and must thus evolve. With the advent of relativistic
implementations of the modified dynamics, one can address the issue of
variability of the two gravitational ''constants'' with some confidence. Using
TeVeS, the Tensor-Vector-Scalar gravitational theory, as an implementation of
MOND, we calculate the dependence of G_N and a_0 on the TeVeS parameters and
the coeval cosmological value of its scalar field, \phi_c. We find that G_N,
when expressed in atomic units, is strictly nonevolving, a result fully
consistent with recent empirical limits on the variation of G_N. By contrast,
we find that a_0 depends on \phi_c and may thus vary with cosmological epoch.
However, for the brand of TeVeS which seems most promising, a_0 variation
occurs on a timescale much longer than Hubble's, and should be imperceptible
back to redshift unity or even beyond it. This is consistent with emergent data
on the rotation curves of disk galaxies at significants redshifts.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:02:06 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bekenstein",
"Jacob D.",
""
],
[
"Sagi",
"Eva",
""
]
] | [
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] |
802.1527 | Semion Saikin | S. K. Saikin, C. Emary, D. G. Steel, and L. J. Sham | Adiabatic optical entanglement between electron spins in separate
quantum dots | 7 pages, 5 figures | Phys. Rev. B 78, 235314 (2008) | 10.1103/PhysRevB.78.235314 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an adiabatic approach to the design of entangling quantum
operations with two electron spins localized in separate InAs/GaAs quantum dots
via the Coulomb interaction between optically-excited localized states.
Slowly-varying optical pulses minimize the pulse noise and the relaxation of
the excited states. An analytic "dressed state" solution gives a clear physical
picture of the entangling process, and a numerical solution is used to
investigate the error dynamics. For two vertically-stacked quantum dots we show
that, for a broad range of dot parameters, a two-spin state with concurrence
$C>0.85$ can be obtained by four optical pulses with durations $\sim 0.1 - 1$
ns.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 23:41:55 GMT"
},
{
"version": "v2",
"created": "Mon, 29 Dec 2008 16:38:28 GMT"
}
] | 2008-12-30T00:00:00 | [
[
"Saikin",
"S. K.",
""
],
[
"Emary",
"C.",
""
],
[
"Steel",
"D. G.",
""
],
[
"Sham",
"L. J.",
""
]
] | [
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] |
802.1528 | Thomas Kitching | T. D. Kitching, L. Miller, C. E. Heymans, L. van Waerbeke, A. F.
Heavens | Bayesian Galaxy Shape Measurement for Weak Lensing Surveys -II.
Application to Simulations | 19 pages, 11 Figures, 2 Tables, submitted to MNRAS. Companion paper
to Miller et al. (2007) arXiv:0708.2340 | null | 10.1111/j.1365-2966.2008.13628.x | null | astro-ph | null | We extend the Bayesian model fitting shape measurement method presented in
Miller et al. (2007) and use the method to estimate the shear from the Shear
TEsting Programme simulations (STEP). The method uses a fast model fitting
algorithm which uses realistic galaxy profiles and analytically marginalises
over the position and amplitude of the model by doing the model fitting in
Fourier space. This is used to find the full posterior probability in
ellipticity so that the shear can be estimated in a fully Bayesian way. The
Bayesian shear estimation allows measurement bias arising from the presence of
random noise to be removed. In this paper we introduce an iterative algorithm
that can be used to estimate the intrinsic ellipticity prior and show that this
is accurate and stable. By using the method to estimate the shear from the
STEP1 simulations we find the method to have a shear bias of m ~ 0.005 and a
variation in shear offset with PSF type of sigma_c ~ 0.0002. These values are
smaller than for any method presented in the STEP1 publication that behaves
linearly with shear. Using the method to estimate the shear from the STEP2
simulations we find than the shear bias and offset are m ~ 0.002 and c ~
-0.0007 respectively. In addition we find that the bias and offset are stable
to changes in magnitude and size of the galaxies. Such biases should yield any
cosmological constraints from future weak lensing surveys robust to systematic
effects in shape measurement.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 20:54:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kitching",
"T. D.",
""
],
[
"Miller",
"L.",
""
],
[
"Heymans",
"C. E.",
""
],
[
"van Waerbeke",
"L.",
""
],
[
"Heavens",
"A. F.",
""
]
] | [
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] |
802.1529 | Justin Finke | Justin Finke, Charles Dermer, Markus Boettcher | Synchrotron Self-Compton Analysis of TeV X-ray Selected BL Lacertae
Objects | 44 pages, 11 figures. Substantial revisions. Accepted by ApJ | null | 10.1086/590900 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a methodology for analysis of multiwavelength data from X-ray
selected BL Lac (XBL) objects detected in the TeV regime. By assuming that the
radio--through--X-ray flux from XBLs is nonthermal synchrotron radiation
emitted by isotropically-distributed electrons in the randomly oriented
magnetic field of a relativistic blazar jet, we obtain the electron spectrum.
This spectrum is then used to deduce the synchrotron self-Compton (SSC)
spectrum as a function of the Doppler factor, magnetic field, and variability
timescale. The variability timescale is used to infer the comoving blob radius
from light travel-time arguments, leaving only two parameters. With this
approach, we accurately simulate the synchrotron and SSC spectrum of flaring
XBLs in the Thomson through Klein-Nishina regimes. Photoabsorption by
interactions with internal jet radiation and the intergalactic background light
(IBL) is included. Doppler factors, magnetic fields, and absolute jet powers
are obtained by fitting the {\em HESS} and {\em Swift} data of the recent giant
TeV flare observed from \object{PKS 2155--304}. For the contemporaneous {\em
Swift} and {\em HESS} data from 28 and 30 July 2006, respectively, Doppler
factors $\gtrsim 60$ and absolute jet powers $\gtrsim 10^{46}$ ergs s$^{-1}$
are required for a synchrotron/SSC model to give a good fit to the data, for a
low intensity of the IBL and a ratio of 10 times more energy in hadrons than
nonthermal electrons. Fits are also made to a TeV flare observed in 2001 from
Mkn 421 which require Doppler factors $\gtrsim 30$ and jet powers $\gtrsim
10^{45}$ erg s$^{-1}$.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:04:18 GMT"
},
{
"version": "v2",
"created": "Tue, 10 Jun 2008 15:46:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Finke",
"Justin",
""
],
[
"Dermer",
"Charles",
""
],
[
"Boettcher",
"Markus",
""
]
] | [
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] |
802.153 | Tristan Smith | Tristan L. Smith (Caltech), Marc Kamionkowski (Caltech), Asantha
Cooray (UC Irvine) | The inflationary gravitational-wave background and measurements of the
scalar spectral index | 7 pages, 7 figures, submitted to PRD | Phys.Rev.D78:083525,2008 | 10.1103/PhysRevD.78.083525 | null | astro-ph | null | Inflation predicts a stochastic background of gravitational waves over a
broad range of frequencies, from those accessible with cosmic microwave
background (CMB) measurements, to those accessible directly with
gravitational-wave detectors, like NASA's Big-Bang Observer (BBO), currently
under study. In a previous paper [Phys. Rev. D73, 023504 (2006)] we connected
CMB constraints to the amplitude and tensor spectral index of the inflationary
gravitational-wave background (IGWB) at BBO frequencies for four classes of
models of inflation by directly solving the inflationary equations of motion.
Here we extend that analysis by including results obtained in the WMAP
third-year data release as well as by considering two additional classes of
inflationary models. As often noted in the literature, the recent indication
that the primordial density power-spectrum has a red spectral index implies
(with some caveats) that the amplitude of the IGWB may be large enough to be
observable in the CMB polarization. Here we also explore the implications for
the direct detection of the IGWB.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 19:32:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Smith",
"Tristan L.",
"",
"Caltech"
],
[
"Kamionkowski",
"Marc",
"",
"Caltech"
],
[
"Cooray",
"Asantha",
"",
"UC Irvine"
]
] | [
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] |
802.1531 | Perivolaropoulos Leandros | Leandros Perivolaropoulos | Vacuum Energy, the Cosmological Constant and Compact Extra Dimensions:
Constraints from Casimir Effect Experiments | 5 pages, 5 figures | Phys.Rev.D77:107301,2008 | 10.1103/PhysRevD.77.107301 | null | astro-ph gr-qc hep-ph hep-th | null | We consider a universe with a compact extra dimension and a cosmological
constant emerging from a suitable ultraviolet cutoff on the zero point energy
of the vacuum. We derive the Casimir force between parallel conducting plates
as a function of the following scales: plate separation, radius of the extra
dimension and cutoff energy scale. We find that there are critical values of
these scales where the Casimir force between the plates changes sign. For the
cutoff energy scale required to reproduce the observed value of the
cosmological constant, we find that the Casimir force changes sign and becomes
repulsive for plate separations less than a critical separation $d_0=0.6mm$,
assuming a zero radius of the extra dimension (no extra dimension). This
prediction contradicts Casimir experiments which indicate an attractive force
down to plate separations of $100nm$. For a non-zero extra dimension radius,
the critical separation $d_0$ gets even larger than $0.6mm$ and remains
inconsistent with Casimir force experiments. We conclude that with or without
the presence of a compact extra dimension, vacuum energy with any suitable
cutoff can not play the role of the cosmological constant.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 07:05:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Perivolaropoulos",
"Leandros",
""
]
] | [
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802.1532 | Jochen Liske | J. Liske, A. Grazian, E. Vanzella, M. Dessauges, M. Viel, L. Pasquini,
M. Haehnelt, S. Cristiani, F. Pepe, G. Avila, P. Bonifacio, F. Bouchy, H.
Dekker, B. Delabre, S. D'Odorico, V. D'Odorico, S. Levshakov, C. Lovis, M.
Mayor, P. Molaro, L. Moscardini, M.T. Murphy, D. Queloz, P. Shaver, S. Udry,
T. Wiklind and S. Zucker | Cosmic dynamics in the era of Extremely Large Telescopes | Accepted for publication in MNRAS, 27 pages, 19 figures | Mon.Not.Roy.Astron.Soc.386:1192-1218,2008 | 10.1111/j.1365-2966.2008.13090.x | null | astro-ph | null | The redshifts of all cosmologically distant sources are expected to
experience a small, systematic drift as a function of time due to the evolution
of the Universe's expansion rate. A measurement of this effect would represent
a direct and entirely model-independent determination of the expansion history
of the Universe over a redshift range that is inaccessible to other methods.
Here we investigate the impact of the next generation of Extremely Large
Telescopes on the feasibility of detecting and characterising the cosmological
redshift drift. We consider the Lyman alpha forest in the redshift range 2 < z
< 5 and other absorption lines in the spectra of high redshift QSOs as the most
suitable targets for a redshift drift experiment. Assuming photon-noise limited
observations and using extensive Monte Carlo simulations we determine the
accuracy to which the redshift drift can be measured from the Ly alpha forest
as a function of signal-to-noise and redshift. Based on this relation and using
the brightness and redshift distributions of known QSOs we find that a 42-m
telescope is capable of unambiguously detecting the redshift drift over a
period of ~20 yr using 4000 h of observing time. Such an experiment would
provide independent evidence for the existence of dark energy without assuming
spatial flatness, using any other cosmological constraints or making any other
astrophysical assumption.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:56:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Liske",
"J.",
""
],
[
"Grazian",
"A.",
""
],
[
"Vanzella",
"E.",
""
],
[
"Dessauges",
"M.",
""
],
[
"Viel",
"M.",
""
],
[
"Pasquini",
"L.",
""
],
[
"Haehnelt",
"M.",
""
],
[
"Cristiani",
"S.",
""
],
[
"Pepe",
"F.",
""
],
[
"Avila",
"G.",
""
],
[
"Bonifacio",
"P.",
""
],
[
"Bouchy",
"F.",
""
],
[
"Dekker",
"H.",
""
],
[
"Delabre",
"B.",
""
],
[
"D'Odorico",
"S.",
""
],
[
"D'Odorico",
"V.",
""
],
[
"Levshakov",
"S.",
""
],
[
"Lovis",
"C.",
""
],
[
"Mayor",
"M.",
""
],
[
"Molaro",
"P.",
""
],
[
"Moscardini",
"L.",
""
],
[
"Murphy",
"M. T.",
""
],
[
"Queloz",
"D.",
""
],
[
"Shaver",
"P.",
""
],
[
"Udry",
"S.",
""
],
[
"Wiklind",
"T.",
""
],
[
"Zucker",
"S.",
""
]
] | [
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] |
802.1533 | Tanmay Vachaspati | Tanmay Vachaspati | Magnetic Fields in the Aftermath of Phase Transitions | 9 pages. Contribution to the Royal Society Discussion Meeting
``Cosmology Meets Condensed Matter'', January 28-29, 2008 | Phil.Trans.Roy.Soc.Lond.A366:2915-2923,2008 | 10.1098/rsta.2008.0074 | null | astro-ph cond-mat.other hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The COSLAB effort has focussed on the formation of topological defects during
phase transitions. Yet there is another potentially interesting signature of
cosmological phase transitions, which also deserves study in the lab. This is
the generation of magnetic fields during phase transitions. In particular,
cosmological phase transitions that also lead to preferential production of
matter over antimatter (``baryogenesis''), are expected to produce helical
(left-handed) magnetic fields. The study of analogous processes in the lab can
yield important insight into the production of helical magnetic fields, and the
observation of such fields in the universe can be invaluable for both particle
physics and cosmology.
| [
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] | 2009-06-23T00:00:00 | [
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802.1534 | Darren Forde | Darren Forde | Constructing QCD one-loop amplitudes | 5 Pages. To appear in the proceedings of the 8th International
Symposium on Radiative Corrections (RADCOR 2007): Application of Quantum
Field Theory to Phenomenology, Florence, Italy, 1-6 Oct 2007 | PoS RADCOR2007:017,2007 | null | SLAC-PUB-13124, UCLA/08/TEP/4 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of constructing one-loop amplitudes using a unitarity
bootstrap approach we discuss a general systematic procedure for obtaining the
coefficients of the scalar bubble and triangle integral functions of one-loop
amplitudes. Coefficients are extracted after examining the behaviour of the cut
integrand as the unconstrained parameters of a specifically chosen
parametersiation of the cut loop momentum approach infinity.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:18:39 GMT"
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] | 2009-08-07T00:00:00 | [
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""
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802.1535 | Patrick Labarque | Patrick Labarque | Blueprint for a Classic Proof of the Four Colour Theorem | 14 pages, 8 colourfull illustrations. The hocus-pocus of the trio's
is replaced by an oriented pairs invariance | null | null | null | math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The proof uses the property that the vertices of a triangulated planar graph
can be four coloured if the triangles can have a +1 or -1 orientation so that
the sum of the triangle orientations around each vertex is a multiple of 3.
Such orientation is first used separately on one of the two triangulated
polygons resulting from a Hamilton circuit in a triangulated planar graph with
v vertices. The graph is then reconstructed by adding the triangles of the
other polygon one by one. When the graph is totally reconstructed there is
always a combination for the orientations of the triangles for which their sum
around each of v-2 successive vertices in the Hamilton circuit is a multiple of
3. It is then provable that the sum of the triangle orientations around the two
remaining vertices must also be a multiple of 3.
| [
{
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"created": "Tue, 17 Jun 2008 19:43:58 GMT"
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{
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"created": "Sat, 23 Aug 2008 21:07:54 GMT"
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] |
802.1536 | Nick Herbert | Nick Herbert | A Pair Of Quanta Cannot Be Wed | 6 pages, no figures | null | null | null | quant-ph | null | Wooters, Zurek and others have shown that "A Single Quantum Cannot Be
Cloned". The reason is two-fold: 1. A quantum cloner would permit FTL
signaling; 2. A quantum cloner would violate the linearity requirement for
quantum superposition. I present here a similar proof that two arbitrary
quantum states cannot be universally welded together to produce a double
quantum state. In particular, opposite polarization states cannot be perfectly
merged. This paper closes another FTL loophole and discloses a new law of
nature: Perfect quantum weddings are not possible.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:42:03 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Herbert",
"Nick",
""
]
] | [
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] |
802.1537 | Justin Finke | Justin Finke, Charles Dermer, Markus Boettcher | Nonthermal Synchrotron and Synchrotron Self-Compton Emission from GRBs:
Predictions for {\em Swift} and {\em GLAST} | 4 pages, 2 figures. Poster at GRB 2007, Santa Fe, New Mexico | null | 10.1063/1.2943490 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results of a leptonic jet model for the prompt emission and early afterglows
of GRBs are presented. The synchrotron component is modeled with the canonical
Band spectrum and the synchrotron self-Compton component is calculated from the
implied synchrotron-emitting electron spectrum in a relativistic plasma blob.
In the comoving frame the magnetic field is assumed to be tangled and the
electron and photon distributions are assumed to be isotropic. The
Compton-scattered spectrum is calculated using the full Compton cross-section
in the Thomson through Klein-Nishina using the Jones formula. Pair production
photoabsorption, both from ambient radiation in the jet and from the
extragalactic background light (EBL), is taken into account. Results are
presented as a function of a small set of parameters: the Doppler factor, the
observed variability timescale, the comoving magnetic field, the peak
synchrotron flux, and the redshift of the burst. Model predictions will be
tested by multiwavelength observations, including the {\em Swift} and {\em
GLAST} satellites, which will provide unprecedented coverage of GRBs.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:31:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Finke",
"Justin",
""
],
[
"Dermer",
"Charles",
""
],
[
"Boettcher",
"Markus",
""
]
] | [
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802.1538 | Andrew Taylor | Dan Hooper, Subir Sarkar, and Andrew M. Taylor | The Intergalactic Propagation of Ultra-High Energy Cosmic Ray Nuclei: An
Analytic Approach | accepted for publication in Phys Rev D | Phys.Rev.D77:103007,2008 | 10.1103/PhysRevD.77.103007 | null | astro-ph hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is likely that ultra-high energy cosmic rays contain a significant
component of heavy or intermediate mass nuclei. The propagation of ultra-high
energy nuclei through cosmic radiation backgrounds is more complicated than
that of protons and its study has required the use of Monte Carlo techniques.
We present an analytic method for calculating the spectrum and the composition
at Earth of ultra-high energy cosmic rays which start out as heavy nuclei from
their extragalactic sources. The results obtained are in good agreement with
those obtained using numerical methods.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:58:33 GMT"
},
{
"version": "v2",
"created": "Sat, 17 May 2008 16:48:30 GMT"
},
{
"version": "v3",
"created": "Wed, 5 Nov 2008 09:58:59 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Hooper",
"Dan",
""
],
[
"Sarkar",
"Subir",
""
],
[
"Taylor",
"Andrew M.",
""
]
] | [
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] |
802.1539 | Dejenie Lakew | Dejenie A. Lakew | Mollifiers in Clifford Analysis | This is a 11 page manuscript,which is a preliminary report on
introducing mollifiers in Clifford analysis | null | null | null | math.AP math.OA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce mollifiers in Clifford analysis setting and construct a sequence
of $\C^{\infinity}$-functions that approximate a $\gamma$-regular function and
a solution to a non homogeneous BVP of an in homogeneous Dirac like operator in
certain Sobolev spaces over bounded domains whose boundary is not that wild.
One can extend the smooth functions upto the boundary if the domain has a
$\C^1$-boundary and this is the case in the paper as we consider a domain whose
boundary is a $\C^2$-hyper surface.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:45:04 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Apr 2008 02:03:18 GMT"
}
] | 2008-04-21T00:00:00 | [
[
"Lakew",
"Dejenie A.",
""
]
] | [
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] |
802.154 | Frieder Kleefeld | F. Kleefeld (CFIF, Ist, Lisbon) | On how to complete the Dynamical Generation of Quark-Level Linear Sigma
Model like Theories beyond one Loop | 20 pages, 4 figures; manuscript prepared on the occasion of M.D.
Scadron's 70th birthday on February 12, 2008, to be celebrated in the
Workshop "Scalar Mesons and Related Topics" (Scadron70) during February
11-16,2008, at the IST, Lisbon, Portugal; revised manuscript corrected for an
obvious typo in Eq. (27) | null | null | FK-2008-1 | hep-ph | null | A self-consistent strategy is proposed to complete in a renormalization
scheme independent way the dynamical generation of Quark-Level Linear Sigma
Model like Lagrangean theories beyond one loop like the theories of strong and
electroweak interactions. The present discussion refers for simplicity to
scalar and pseudoscalar degrees of freedom only while disregarding yet -
without loss of generality - vector and axial vector degrees of freedom.
Moreover points the discussion to approximations underlying dimensional and
implicit regularization as presently used.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 22:08:34 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 22:21:54 GMT"
}
] | 2008-02-22T00:00:00 | [
[
"Kleefeld",
"F.",
"",
"CFIF, Ist, Lisbon"
]
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802.1541 | Aldemar Torres Valderrama | Aldemar Torres, Gabriel Tellez, Rene van Roij | The polydisperse cell model: Non-linear screening and charge
renormalization in colloidal mixtures | null | J. Chem. Phys. 128, 154906 (2008) | 10.1063/1.2907719 | null | cond-mat.soft cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model for the calculation of renormalized charges and osmotic
properties of mixtures of highly charged colloidal particles. The model is a
generalization of the cell model and the notion of charge renormalization as
introduced by Alexander and his collaborators (J. Chem. Phys. 80, 5776 (1984)).
The total solution is partitioned into as many different cells as components in
the mixture. The radii of these cells are determined self-consistently for a
given set of parameters from the solution of the non-linear Poisson-Boltzmann
equation with appropriate boundary conditions. This generalizes Alexanders's
model where the (unique) Wigner-Seitz cell radius is fixed solely by the
colloids packing fraction. We illustrate the technique by considering a binary
mixture of colloids with the same sign of charge. The present model can be used
to calculate thermodynamic properties of highly charged colloidal mixtures at
the level of linear theories, while taking the effect of non-linear screening
into account.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:53:50 GMT"
}
] | 2009-03-19T00:00:00 | [
[
"Torres",
"Aldemar",
""
],
[
"Tellez",
"Gabriel",
""
],
[
"van Roij",
"Rene",
""
]
] | [
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] |
802.1542 | Dvira Segal | Dvira Segal | Thermal conduction in molecular chains: Non-Markovian effects | null | Journal of Chem. Phys. 128, 224710 (2008) | 10.1063/1.2938092 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of non-Markovian reservoirs on the heat conduction
properties of short to intermediate size molecular chains. Using classical
molecular dynamics simulations, we show that the distance dependence of the
heat current is determined not only by the molecular properties, rather it is
also critically influenced by the spectral properties of the heat baths for
both harmonic and anharmonic molecular chains. For highly correlated reservoirs
the current of an anharmonic chain may exceed the flux of the corresponding
harmonic system. Our numerical results are accompanied by a simple single-mode
heat conduction model that can capture the intricate distance dependence
obtained numerically.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 21:55:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Segal",
"Dvira",
""
]
] | [
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802.1543 | Brian Jackson | Brian Jackson, Richard Greenberg, Rory Barnes | Tidal Evolution of Close-in Extra-Solar Planets | 9 pages, 3 figures. To appear in the proceedings of IAU Symposium
249: Exoplanets: Detection, Formation and Dynamics, held in Suzhou, China,
Oct 22-26 2007. A version with full resolution figures is available at
http://www.lpl.arizona.edu/~bjackson/publications/IAU249_proc.pdf | null | 10.1086/529187 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The distribution of eccentricities e of extra-solar planets with semi-major
axes a > 0.2 AU is very uniform, and values for e are generally large. For a <
0.2 AU, eccentricities are much smaller (most e < 0.2), a characteristic widely
attributed to damping by tides after the planets formed and the protoplanetary
gas disk dissipated. We have integrated the classical coupled tidal evolution
equations for e and a backward in time over the estimated age of each planet,
and confirmed that the distribution of initial e values of close-in planets
matches that of the general population for reasonable tidal dissipation values
Q, with the best fits for stellar and planetary Q being ~ 10^5.5 and ~ 10^6.5
respectively. The current small values of a were only reached gradually due to
tides over the lifetimes of the planets, i.e., the earlier gas disk migration
did not bring all planets to their current orbits. As the orbits tidally
evolved, there was substantial tidal heating within the planets. The past tidal
heating of each planet may have contributed significantly to the thermal budget
that governed the planet's physical properties, including its radius, which in
many cases may be measured by observing transit events. Here we also compute
the plausible heating histories for a few planets with anomalously large
measured radii, including HD 209458 b. We show that they may have undergone
substantial tidal heating during the past billion years, perhaps enough to
explain their large radii. Theoretical models of exoplanet interiors and the
corresponding radii should include the role of large and time-variable tidal
heating. Our results may have important implications for planet formation
models, physical models of "hot Jupiters", and the success of transit surveys.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 22:17:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jackson",
"Brian",
""
],
[
"Greenberg",
"Richard",
""
],
[
"Barnes",
"Rory",
""
]
] | [
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] |
802.1544 | Dirk Schuricht | Dirk Schuricht, Fabian H. L. Essler, Akbar Jaefari, and Eduardo
Fradkin | Local density of states of 1D Mott insulators and CDW states with a
boundary | null | Phys. Rev. Lett. 101, 086403 (2008) | 10.1103/PhysRevLett.101.086403 | null | cond-mat.str-el cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the local density of states (LDOS) of one-dimensional
incommensurate charge density wave (CDW) states in the presence of a strong
impurity potential, which is modeled by a boundary. We find that the CDW gets
pinned at the impurity, which results in a singularity in the Fourier transform
of the LDOS at momentum 2k_F. At energies above the spin gap we observe
dispersing features associated with the spin and charge degrees of freedom
respectively. In the presence of an impurity magnetic field we observe the
formation of a bound state localized at the impurity. All of our results carry
over to the case of one dimensional Mott insulators by exchanging the roles of
spin and charge degrees of freedom. We discuss the implications of our result
for scanning tunneling microscopy experiments on spin-gap systems such as
two-leg ladder cuprates and 1D Mott insulators.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 22:35:28 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Aug 2008 17:38:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schuricht",
"Dirk",
""
],
[
"Essler",
"Fabian H. L.",
""
],
[
"Jaefari",
"Akbar",
""
],
[
"Fradkin",
"Eduardo",
""
]
] | [
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802.1545 | Natalia Iyudu | N.Iyudu | Representation theory of Jordanian algebra | 31 pages | null | null | null | math.RA math.RT | null | We describe the complete set of pairwise non-isomorphic irreducible modules
S(a) over the algebra R given by the defining relation xy-yx=yy, and the rule
how they could be glued to indecomposables. Namely, we show that
Ext_k^1(S(a),S(b))=0, if a not equal to b. Also the set of all representations
is described subject to the Jordan normal form of Y.
We study then properties of the image algebras in the endomorphism ring.
Among facts we prove is that they are all basic algebras. Along this line we
establish an analogue of the Gerstenhaber-Taussky-Motzkin theorem on the
dimension of algebras generated by two commuting matrices. All image algebras
of indecomposable modules turned out to be local complete algebras. We compare
them with the Ringel's classification by means of finding relations of image
algebras. As a result we derive that all image algebras of n-dimensional
representations with full block Y are tame for n smaller or equal then 4 and
wild for n starting from 5.
We suggest a stratification of representation space of R related to the
partitions of n defined by the Jordan normal form of Y. We give a complete
classification by parameters for some strata and present examples of tame (up
to automorphisms) strata, while the generic strata is wild.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 16:59:47 GMT"
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] | 2008-02-13T00:00:00 | [
[
"Iyudu",
"N.",
""
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] |
802.1546 | Larry Ford | R. T. Thompson and L. H. Ford | Enhanced Geometry Fluctuations in Minkowski and Black Hole Spacetimes | 13 pages, 3 figures, based on a talk presented at the Peyresq 12
workshop | Class.Quant.Grav.25:154006,2008 | 10.1088/0264-9381/25/15/154006 | null | gr-qc | null | We will discuss selected physical effects of spacetime geometry fluctuations,
especially the operational signatures of geometry fluctuations and their
effects on black hole horizons. The operational signatures which we discuss
involve the effects of the fluctuations on images, and include luminosity
variations, spectral line broadening and angular blurring. Our main interest
will be in black hole horizon fluctuations, especially horizon fluctuations
which have been enhanced above the vacuum level by gravitons or matter in
squeezed states. We investigate whether these fluctuations can alter the
thermal character of a black hole. We find that this thermal character is
remarkably robust, and that Hawking's original derivation using transplanckian
modes does not seem to be sensitive even to enhanced horizon fluctuations.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 01:25:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Thompson",
"R. T.",
""
],
[
"Ford",
"L. H.",
""
]
] | [
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802.1547 | Paoti Chang | The Belle Collaboration: Y. T. Shen, K.-F. Chen, P. Chang, et al | Study of B-> phi phi K Decays | 6 pages, 3 figures | null | null | KEK Preprint 2007-70, Belle Preprint 2008-1 | hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report an observation of the decay B^\pm -> \phi \phi K^\pm and evidence
for B^0 -> \phi \phi K^0. These results are based on a 414 fb^{-1} data sample
collected with the Belle detector at the KEKB asymmetric-energy e^+e^- collider
operating at the \Upsilon(4S) resonance. The branching fractions for these
decay modes are measured to be Br(B^{\pm} -> \phi \phi K^\pm) =
(3.2^{+0.6}_{-0.5} +- 0.3) * 10^{-6} and Br(B^{0} \to \phi \phi K^{0}) =
(2.3^{+1.0}_{-0.7} +- 0.2) * 10^{-6} for \phi \phi invariant mass below 2.85
GeV/c^2. The corresponding partial rate asymmetry for the charged B mode is
measured to be A_{CP}(B^\pm -> \phi \phi K^\pm) = 0.01^{+0.19}_{-0.16} +- 0.02.
We also study the decays B^\pm -> J/\psi K^\pm and B^\pm -> \eta_c K^\pm, where
the J/\psi and \eta_c decay to final states with four charged kaons. We find
A_{CP}(B^\pm -> \phi \phi K^\pm) with the \phi\phi candidates within the \eta_c
mass region is 0.15^{+0.16}_{-0.17} +- 0.02, consistent with no asymmetry.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 23:59:42 GMT"
}
] | 2009-02-19T00:00:00 | [
[
"The Belle Collaboration",
"",
""
],
[
"Shen",
"Y. T.",
""
],
[
"Chen",
"K. -F.",
""
],
[
"Chang",
"P.",
""
]
] | [
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802.1548 | Carlos Escudero | Carlos Escudero and Jose Angel Rodriguez | Persistence of instanton connections in chemical reactions with time
dependent rates | null | Phys. Rev. E 77, 011130 (2008) | 10.1103/PhysRevE.77.011130 | null | cond-mat.stat-mech math.DS physics.chem-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of a system of chemical reactions can be studied, in the
eikonal approximation, by means of a Hamiltonian dynamical system. The fixed
points of this dynamical system represent the different states in which the
chemical system can be found, and the connections among them represent
instantons or optimal paths linking these states. We study the relation between
the phase portrait of the Hamiltonian system representing a set of chemical
reactions with constant rates and the corresponding system when these rates
vary in time. We show that the topology of the phase space is robust for small
time-dependent perturbations in concrete examples and state general results
when possible. This robustness allows us to apply some of the conclusions on
the qualitative behavior of the autonomous system to the time-dependent
situation.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 00:34:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Escudero",
"Carlos",
""
],
[
"Rodriguez",
"Jose Angel",
""
]
] | [
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] |
802.1549 | Benjamin Baugher | Benjamin Baugher | Metric Dependence and Asymptotic Minimization of the Expected Number of
Critical Points of Random Holomorphic Sections | 19 pages, added references; also includes a Mathematica worksheet in
both notebook and pdf form | null | null | null | math-ph hep-th math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the main conjecture from [M. R. Douglas, B. Shiffman and S.
Zelditch, Critical points and supersymmetric vacua, II: Asymptotics and
extremal metrics. J. Differential Geom. 72 (2006), no. 3, 381-427] concerning
the metric dependence and asymptotic minimization of the expected number
\mathcal{N}^{crit}_{N,h} of critical points of random holomorphic sections of
the Nth tensor power of a positive line bundle. The first non-topological term
in the asymptotic expansion of \mathcal{N}^{crit}_{N,h} is the the Calabi
functional multiplied by the constant \be_2(m) which depends only on the
dimension of the manifold. We prove that \be_2(m) is strictly positive in all
dimensions, showing that the expansion is non-topological for all m, and that
the Calabi extremal metric, when it exists, asymptotically minimizes
\mathcal{N}^{crit}_{N,h}.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 00:35:19 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 02:59:12 GMT"
}
] | 2008-02-18T00:00:00 | [
[
"Baugher",
"Benjamin",
""
]
] | [
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0.0012488203,
-0.0894345045,
-0.0396081544,
0.0296175927,
-0.0190453008,
-0.0890804082,
0.0073474897
] |
802.155 | Edwin Lee | E. Lee (NCAR), M. E. Brachet (\'Ecole Normale Sup\'erieure), A.
Pouquet (NCAR), P. D. Mininni (NCAR), D. Rosenberg (NCAR) | A paradigmatic flow for small-scale magnetohydrodynamics: properties of
the ideal case and the collision of current sheets | 8 pages, 4 figures | null | 10.1103/PhysRevE.78.066401 | null | physics.flu-dyn physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose two sets of initial conditions for magnetohydrodynamics (MHD) in
which both the velocity and the magnetic fields have spatial symmetries that
are preserved by the dynamical equations as the system evolves. When
implemented numerically they allow for substantial savings in CPU time and
memory storage requirements for a given resolved scale separation. Basic
properties of these Taylor-Green flows generalized to MHD are given, and the
ideal non-dissipative case is studied up to the equivalent of 2048^3 grid
points for one of these flows. The temporal evolution of the logarithmic
decrements, delta, of the energy spectrum remains exponential at the highest
spatial resolution considered, for which an acceleration is observed briefly
before the grid resolution is reached. Up to the end of the exponential decay
of delta, the behavior is consistent with a regular flow with no appearance of
a singularity. The subsequent short acceleration in the formation of small
magnetic scales can be associated with a near collision of two current sheets
driven together by magnetic pressure. It leads to strong gradients with a fast
rotation of the direction of the magnetic field, a feature also observed in the
solar wind.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 01:22:14 GMT"
},
{
"version": "v2",
"created": "Tue, 27 May 2008 21:27:49 GMT"
},
{
"version": "v3",
"created": "Mon, 25 Aug 2008 20:48:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lee",
"E.",
"",
"NCAR"
],
[
"Brachet",
"M. E.",
"",
"École Normale Supérieure"
],
[
"Pouquet",
"A.",
"",
"NCAR"
],
[
"Mininni",
"P. D.",
"",
"NCAR"
],
[
"Rosenberg",
"D.",
"",
"NCAR"
]
] | [
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802.1551 | Paul Woon Yin Lee | Boris Khesin, Paul Lee | A nonholonomic Moser theorem and optimal transport | 31 pages, 5 figures | null | null | null | math.DG math.SG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the following nonholonomic version of the classical Moser theorem:
given a bracket-generating distribution on a connected compact manifold
(possibly with boundary), two volume forms of equal total volume can be
isotoped by the flow of a vector field tangent to this distribution. We
describe formal solutions of the corresponding nonholonomic mass transport
problem and present the Hamiltonian framework for both the Otto calculus and
its nonholonomic counterpart as infinite-dimensional Hamiltonian reductions on
diffeomorphism groups.
Finally, we define a nonholonomic analog of the Wasserstein (or, Kantorovich)
metric on the space of densities and prove that the subriemannian heat equation
defines a gradient flow on the nonholonomic Wasserstein space with the
potential given by the Boltzmann relative entropy functional.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 01:22:13 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 23:51:44 GMT"
}
] | 2008-03-13T00:00:00 | [
[
"Khesin",
"Boris",
""
],
[
"Lee",
"Paul",
""
]
] | [
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] |
802.1552 | Franz Gross | Franz Gross and Alfred Stadler | Covariant spectator theory of np scattering: Phase shifts obtained from
precision fits to data below 350 MeV | 43 pages, 27 figures, and 13 tables | Phys.Rev.C78:014005,2008 | 10.1103/PhysRevC.78.014005 | JLAB-THY-08-777 | nucl-th | null | Using the covariant spectator theory (CST), we present two one boson exchange
kernels that have been successfully adjusted to fit the 2007 world np data
(containing 3788 data) below 350 MeV. One model (which we designate WJC-1) has
27 parameters and fits with a chi2/N = 1.06. The other model (designated WJC-2)
has only 15 parameters and fits with a chi2/N = 1.12. Both of these models also
reproduce the experimental triton binding energy without introducing additional
irreducible three-nucleon forces. One result of this work is a new phase shift
analysis, updated for all data until 2006, which is useful even if one does not
work within the CST. In carrying out these fits we have reviewed the entire
data base, adding new data not previously used in other high precision fits and
restoring some data omitted in previous fits. A full discussion and evaluation
of the 2007 data base is presented.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 17:03:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gross",
"Franz",
""
],
[
"Stadler",
"Alfred",
""
]
] | [
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] |
802.1553 | Arturo Samana R | A.R. Samana, C.A. Bertulani | Detection of supernovae neutrinos with neutrino-iron scattering | 5 pages and 3 figures, accepted for publication in Phys. Rev. C | Phys.Rev.C78:024312,2008 | 10.1103/PhysRevC.78.024312 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\nu_e-^{56}$Fe cross section is evaluated in the projected quasiparticle
random phase approximation (PQRPA). This model solves the puzzle observed in
RPA for nuclei with mass around $^{12}$C, because it is the only RPA model that
treats the Pauli principle correctly. The cross sections as a function of the
incident neutrino energy are compared with recent theoretical calculations of
similar models. The average cross section weighted with the flux spectrum
yields a good agreement with the experimental data. The expected number of
events in the detection of supernova neutrinos is calculated for the LVD
detector leading to an upper limit for the electron neutrino energy of
particular importance in this experiment
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 01:44:52 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Jul 2008 20:28:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Samana",
"A. R.",
""
],
[
"Bertulani",
"C. A.",
""
]
] | [
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] |
802.1554 | Lexing Ying | Lexing Ying, Sergey Fomel | Fast Computation of Partial Fourier Transforms | 12 pages | null | null | null | math.NA | null | We introduce two efficient algorithms for computing the partial
Fourier transforms in one and two dimensions. Our study is motivated by the
wave extrapolation procedure in reflection seismology. In both algorithms, the
main idea is to decompose the summation domain of into simpler components in a
multiscale way. Existing fast algorithms are then applied to each component to
obtain optimal complexity. The algorithm in 1D is exact and takes $O(N\log^2
N)$ steps. Our solution in 2D is an approximate but accurate algorithm that
takes $O(N^2 \log^2 N)$ steps. In both cases, the complexities are almost
linear in terms of the degree of freedom. We provide numerical results on
several test examples.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 02:10:41 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Ying",
"Lexing",
""
],
[
"Fomel",
"Sergey",
""
]
] | [
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] |
802.1555 | Shengtian Yang | Shengtian Yang, Yan Chen, Thomas Honold, Zhaoyang Zhang, Peiliang Qiu | Constructing Linear Codes with Good Joint Spectra | 6 pages, 1 figure, to appear in Proc. ChinaCom 2008 | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of finding good linear codes for joint source-channel coding
(JSCC) is investigated in this paper. By the code-spectrum approach, it has
been proved in the authors' previous paper that a good linear code for the
authors' JSCC scheme is a code with a good joint spectrum, so the main task in
this paper is to construct linear codes with good joint spectra. First, the
code-spectrum approach is developed further to facilitate the calculation of
spectra. Second, some general principles for constructing good linear codes are
presented. Finally, we propose an explicit construction of linear codes with
good joint spectra based on low density parity check (LDPC) codes and low
density generator matrix (LDGM) codes.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 02:23:02 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Aug 2008 02:04:53 GMT"
}
] | 2008-08-28T00:00:00 | [
[
"Yang",
"Shengtian",
""
],
[
"Chen",
"Yan",
""
],
[
"Honold",
"Thomas",
""
],
[
"Zhang",
"Zhaoyang",
""
],
[
"Qiu",
"Peiliang",
""
]
] | [
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] |
802.1556 | Ashoke Sen | Shamik Banerjee, Ashoke Sen, Yogesh K. Srivastava | Partition Functions of Torsion >1 Dyons in Heterotic String Theory on
T^6 | LaTeX file, 16 pages | JHEP 0805:098,2008 | 10.1088/1126-6708/2008/05/098 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The original proposal of Dijkgraaf, Verlinde and Verlinde for the quarter BPS
dyon partition function in heterotic string theory on T^6 is known to correctly
produce the degeneracy of dyons of torsion 1, i.e. dyons for which gcd(Q\wedge
P)=1. We propose a generalization of this formula for dyons of arbitrary
torsion. Our proposal satisfies the constraints coming from S-duality
invariance, wall crossing formula, black hole entropy and the gauge theory
limit. Furthermore using our proposal we derive a general wall crossing formula
that is valid even when both the decay products are non-primitive half-BPS
dyons.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 02:52:52 GMT"
}
] | 2009-09-15T00:00:00 | [
[
"Banerjee",
"Shamik",
""
],
[
"Sen",
"Ashoke",
""
],
[
"Srivastava",
"Yogesh K.",
""
]
] | [
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] |
802.1557 | Andrew Frey | Rebecca J. Danos, Andrew R. Frey, Robert H. Brandenberger | Stabilizing moduli with thermal matter and nonperturbative effects | 13pg, 1 fig; v2. minor clarifications & reference additions | Phys.Rev.D77:126009,2008 | 10.1103/PhysRevD.77.126009 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Even with recent progress, it is still very much an open question to
understand how all compactification moduli are stabilized, since there are
several mechanisms. For example, it is possible to generate a scalar potential
either classically or through nonperturbative effects, such as gaugino
condensation. Such a potential can stabilize certain of the moduli fields, for
example the dilaton. On the other hand, a background of thermal matter with
moduli-dependent masses can also stabilize certain of the moduli, e.g., the
radion. It is important to understand whether these two distinct mechanisms are
compatible with each other, that is, that there are no interference terms that
could spoil the moduli stabilization. In this paper, we study heterotic string
theory on an N=1 orbifold near an enhanced symmetry point. We then consider
both a nonperturbatively generated potential and a gas of strings with
moduli-dependent masses to stabilize the dilaton and radial modulus,
respectively. We conclude that, given certain approximations, these two moduli
stabilization mechanisms are compatible.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 02:53:03 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Apr 2008 19:19:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Danos",
"Rebecca J.",
""
],
[
"Frey",
"Andrew R.",
""
],
[
"Brandenberger",
"Robert H.",
""
]
] | [
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] |
802.1558 | Irina Novikova | Eugeniy E. Mikhailov, Irina Novikova | Low-frequency vacuum squeezing via polarization self-rotation in Rb
vapor | 4 pages, 3 figures | Optics Letters, Issue 11, 33, 1213-1215, (2008) | 10.1364/OL.33.001213 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We observed squeezed vacuum light at 795 nm in 87Rb vapor via resonant
polarization self-rotation, and report noise sidebands suppression of ~1 dB
below shot noise level spanning from acoustic (30 kHz) to MHz frequencies. This
is the first demonstration of sub-MHz quadrature vacuum squeezing in atomic
systems. The spectral range of observed squeezing matches well typical
bandwidths of electromagnetically induced transparency (EIT) resonances, making
this simple technique for generation of optical fields with non-classical
statistics at atomic transitions wavelengths attractive for EIT-based quantum
information protocols applications.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 03:14:17 GMT"
}
] | 2010-09-29T00:00:00 | [
[
"Mikhailov",
"Eugeniy E.",
""
],
[
"Novikova",
"Irina",
""
]
] | [
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802.1559 | X. F. Sun | X. F. Sun (USTC), S. Ono (CRIEPI), X. Zhao (USTC), Z. Q. Pang (USTC),
Y. Abe (CRIEPI), Y. Ando (Osaka Univ.) | Doping dependence of phonon and quasiparticle heat transport of pure and
Dy-doped Bi_2Sr_2CaCu_2O_{8+\delta} single crystals | 11 pages, 11 figures, accepted for publication in Phys. Rev. B | Phys. Rev. B 77, 094515 (2008) | 10.1103/PhysRevB.77.094515 | null | cond-mat.supr-con cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The temperature and magnetic-field (H) dependences of thermal conductivity
(\kappa) of Bi_2Sr_2CaCu_2O_{8+\delta} (Bi2212) are systematically measured for
a broad doping range by using both pure Bi2212 single crystals with tuned
oxygen contents and Bi_2Sr_2Ca_{1-x}Dy_xCu_2O_{8+\delta} (Dy-Bi2212) single
crystals with different Dy contents x. In the underdoped samples, the
quasiparticle (QP) peak below T_c is strongly suppressed, indicating strong QP
scattering by impurities or oxygen defects, whereas the phonon conductivity is
enhanced in moderately Dy-doped samples and a phonon peak at 10 K is observed
for the first time in Bi2212 system, which means Dy^{3+} ions not only
introduce the impurities or point defects but also stabilize the crystal
lattice. The subkelvin data show that the QP heat conductivity gradually
decreases upon lowering the hole doping level. The magnetic-field dependence of
\kappa at temperature above 5 K is mainly due to the QP scattering off
vortices. While the underdoped pure Bi2212 show very weak field dependence of
\kappa, the Dy-doped samples present an additional "dip"-like term of \kappa(H)
at low field, which is discussed to be related to the phonon scattering by free
spins of Dy^{3+} ions. For non-superconducting Dy-Bi2212 samples with x \simeq
0.50, an interesting "plateau" feature shows up in the low-T \kappa(H)
isotherms with characteristic field at 1 -- 2 T, for which we discuss the
possible revlevance of magnon excitations.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 03:24:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sun",
"X. F.",
"",
"USTC"
],
[
"Ono",
"S.",
"",
"CRIEPI"
],
[
"Zhao",
"X.",
"",
"USTC"
],
[
"Pang",
"Z. Q.",
"",
"USTC"
],
[
"Abe",
"Y.",
"",
"CRIEPI"
],
[
"Ando",
"Y.",
"",
"Osaka Univ."
]
] | [
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802.156 | Sergei Urazhdin | S. Urazhdin | Dynamical Coupling Between Ferromagnets Due to Spin Transfer Torque | 4 pages, 3 figures | null | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a combination of analytic calculations and numerical simulations to
demonstrate that electrical current flowing through a magnetic bilayer induces
dynamical coupling between the layers. The coupling originates from the
dependence of the spin transfer torque exerted on the layers on the relative
orientations of their magnetic moments. We demonstrate that such coupling
modifies the behaviors of both layers, significantly affecting the the
stability of the current-induced dynamical regimes and the efficiency of
current-induced magnetic reversal.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 03:32:45 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Urazhdin",
"S.",
""
]
] | [
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] |
802.1561 | David Mattingly | David Mattingly | Have we tested Lorentz invariance enough? | 17 pages, Talk given at 'From Quantum to Emergent Gravity: Theory and
Phenomenology', SISSA, June 2007 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by ideas from quantum gravity, Lorentz invariance has undergone
many stringent tests over the past decade and passed every one. Since there is
no conclusive reason from quantum gravity that the symmetry \textit{must} be
violated at some point we should ask the questions: a) are the existing tests
sufficient that the symmetry is already likely exact at the Planck scale? b)
Are further tests simply blind searches for new physics without reasonable
expectation of a positive signal? Here we argue that the existing tests are not
quite sufficient and describe some theoretically interesting areas of existing
parameterizations for Lorentz violation in the infrared that are not yet ruled
out but are accessible (or almost accessible) by current experiments. We
illustrate this point using a vector field model for Lorentz violation
containing operators up to mass dimension six and analyzing how terrestrial
experiments, neutrino observatories, and Auger results on ultra-high energy
cosmic rays limit this model.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 03:33:17 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Mattingly",
"David",
""
]
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] |
802.1562 | Arun Kenath Mr | C. Sivaram (1) and Kenath Arun (2) ((1) Indian Institute of
Astrophysics, Bangalore, India; (2) Christ Junior College, Bangalore, India) | Some Additional Bounds on the Photon Charge | 7 pages, 13 equations | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have arrived at tight constraints on the photon charge, giving comparable
bounds, one based on the dominance by dark energy at the present epoch, and the
other based on the requirement that early universe nucleosynthesis not be
affected by any residual electrostatic energy due to any miniscule charge on
the radiation photons in that era. Limits have also been arrived at from
synchrotron and IC effects. We have also set limits on the charge based on the
properties of black holes. The set of constraints arrived at in this paper are
consistent with those predicted by other authors.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 03:56:07 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Sivaram",
"C.",
""
],
[
"Arun",
"Kenath",
""
]
] | [
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802.1563 | Hiroshi Ohki | Hiroshi Ohki, Hideo Matsufuru, Tetsuya Onogi | Determination of B*B pi coupling in unquenched QCD | 19pages,26figures | Phys.Rev.D77:094509,2008 | 10.1103/PhysRevD.77.094509 | YITP-08-3, KUNS-2123, KEK-CP-206 | hep-lat | http://creativecommons.org/licenses/by/3.0/ | The $B^* B\pi$ coupling is a fundamental parameter of chiral effective
Lagrangian with heavy-light mesons and can constrain the chiral behavior of
$f_B$, $B_B$ and the $B\to \pi l \nu$ form factor in the soft pion limit. We
compute the $B^* B \pi $ coupling with the static heavy quark and the
$O(a)$-improved Wilson light quark. Simulations are carried out with $n_f=2$
unquenched $12^3\times 24$ lattices at $\beta=1.80$ and $16^3\times 32$
lattices at $\beta=1.95$ generated by CP-PACS collaboration. To improve the
statistical accuracy, we employ the all-to-all propagator technique and the
static quark action with smeared temporal link variables following the quenched
study by Negishi {\it et al.}. These methods successfully work also on
unquenched lattices, and determine the $B^*B\pi$ coupling with 1--2%
statistical accuracy on each lattice spacing.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 03:57:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ohki",
"Hiroshi",
""
],
[
"Matsufuru",
"Hideo",
""
],
[
"Onogi",
"Tetsuya",
""
]
] | [
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802.1564 | Tomoyuki Arakawa | Tomoyuki Arakawa | Representation theory of W-algebras, II: Ramond twisted representations | Fixed some errors | Adv. Stud. Pure Math., 2011: 51-90 (2011) | 10.2969/aspm/06110051 | null | math.QA math-ph math.MP math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Ramond twisted representations of the affine W-algebra W^k(g,f)
in the case that f admits a good even grading. We establish the vanishing and
the almost irreducibility of the corresponding BRST cohomology. This confirms
some of the recent conjectures of Kac and Wakimoto. In type A, our results give
the characters of all irreducible ordinary Ramond twisted representations of
W^k(sl_n,f) for all nilpotent elements f and all non-critical k, and prove the
existence of modular invariant representations conjectured by Kac and Wakimoto.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:39:35 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jun 2008 08:11:45 GMT"
}
] | 2024-02-15T00:00:00 | [
[
"Arakawa",
"Tomoyuki",
""
]
] | [
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802.1565 | Tomoya Machide | Tomoya Machide | Generators for Vector Spaces Spanned by Double Zeta Values with Even
Weight | ver.2 : I replaced the preprint by the final version of a manuscript.
Note that the title is modified; "consisting of" is changed to "spanned by" | J. Number Theory 133 (2013), 2240-2246 | 10.1016/j.jnt.2012.12.010 | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $\mathcal{DZ}_k$ be the $\mathbb{Q}$-vector space spanned by double zeta
values with weight $k$, and $\mathcal{DM}_k$ be its quotient space divided by
the space $\mathcal{PZ}_k$ spanned by the zeta value $\zeta(k)$ and products of
two zeta values with total weight $k$. When $k$ is even, an upper bound for the
dimension of $\mathcal{DM}_k$ is known. By adding the dimensions of
$\mathcal{DM}_k$ and $\mathcal{PZ}_k$, an upper bound of $\mathcal{DZ}_k$ which
equals $k/2$ minus the dimension of the space of modular forms of weight $k$ on
the modular group is given. In this note, we obtain some specific sets of
generators for $\mathcal{DM}_k$ which represent the upper bound. These yield
the corresponding sets and the upper bound for $\mathcal{DZ}_k$.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 05:05:47 GMT"
},
{
"version": "v2",
"created": "Sat, 26 Apr 2014 08:05:03 GMT"
}
] | 2014-04-29T00:00:00 | [
[
"Machide",
"Tomoya",
""
]
] | [
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] |
802.1566 | Jia Han | Jiaguang Han, Sher-Yi Chiam, Ee Jin Teo, Andrew A. Bettiol and Weili
Zhang | New assembly route for three-dimensional metamaterials through effect
medium theory | 17 pages, 5 figures | null | null | null | cond-mat.mtrl-sci | null | In this study, we illustrate the effective medium theories in the designs of
three-dimensional composite metametails of both negative permittivity and
permeability. The proposed metamaterials consist of coated spheres embedded in
a dielectric host. Simple design rules and formulas following the effective
medium models are numerically and analytically presented. We demonstrate that
the revised Maxwell-Garnett effective medium theory enables us to design
three-dimensional composite metamaterials through assembly of coated small
spheres. The proposed approach allows for precise control of the permittivity
and permeability and guides a facile, flexible and versatile way for the
fabrication of composite metamaterials.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 13:09:57 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Han",
"Jiaguang",
""
],
[
"Chiam",
"Sher-Yi",
""
],
[
"Teo",
"Ee Jin",
""
],
[
"Bettiol",
"Andrew A.",
""
],
[
"Zhang",
"Weili",
""
]
] | [
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] |
802.1567 | Shigeaki Kuzuoka | Shigeaki Kuzuoka, Akisato Kimura, Tomohiko Uyematsu | Universal Coding for Lossless and Lossy Complementary Delivery Problems | 20 pages, one column, submitted to IEEE Transactions on Information
Theory | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper deals with a coding problem called complementary delivery, where
messages from two correlated sources are jointly encoded and each decoder
reproduces one of two messages using the other message as the side information.
Both lossless and lossy universal complementary delivery coding schemes are
investigated. In the lossless case, it is demonstrated that a universal
complementary delivery code can be constructed by only combining two
Slepian-Wolf codes. Especially, it is shown that a universal lossless
complementary delivery code, for which error probability is exponentially
tight, can be constructed from two linear Slepian-Wolf codes. In the lossy
case, a universal complementary delivery coding scheme based on Wyner-Ziv codes
is proposed. While the proposed scheme cannot attain the optimal
rate-distortion trade-off in general, the rate-loss is upper bounded by a
universal constant under some mild conditions. The proposed schemes allows us
to apply any Slepian-Wolf and Wyner-Ziv codes to complementary delivery coding.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 05:54:27 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Kuzuoka",
"Shigeaki",
""
],
[
"Kimura",
"Akisato",
""
],
[
"Uyematsu",
"Tomohiko",
""
]
] | [
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802.1568 | Mihran Papikian | Mihran Papikian | Modular varieties of D-elliptic sheaves and the Weil-Deligne bound | 19 pages; to appear in Crelle | null | null | null | math.NT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the asymptotic grows of the number of rational points on modular
varieties of D-elliptic sheaves over finite fields to the grows of their Betti
numbers as the degree of the level tends to infinity. This is a generalization
to higher dimensions of a well-known result for modular curves. As a
consequence of the main result, we also produce a new asymptotically optimal
sequence of curves.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 06:15:56 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Papikian",
"Mihran",
""
]
] | [
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] |
802.1569 | Angom Dilip Singh | S. Gautam and D. Angom | p-wave phase shift and scattering length of $^6$Li | 10 figures | Euro. Phys. J. D 56, 173 (2010) | 10.1140/epjd/e2009-00289-y | null | physics.atom-ph physics.chem-ph physics.comp-ph | null | We have calculated the p-wave phase shifts and scattering length of $^6$Li.
For this we solve the $p$ partial wave Schr\"odinger equation and analyze the
validity of adopting the semiclassical solution to evaluate the constant
factors in the solution. Unlike in the $s$ wave case, the semiclassical
solution does not provide unique value of the constants. We suggest an
approximate analytic solution, which provides reliable results in special
cases. Further more, we also use the variable phase method to evaluate the
phase shifts. The p-wave scattering lengths of $^{132}$Cs and $^{134}$Cs are
calculated to validate the schemes followed. Based on our calculations, the
value of the $p$ wave scattering length of $^6$Li is $-45a_o$.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 06:29:12 GMT"
}
] | 2010-01-30T00:00:00 | [
[
"Gautam",
"S.",
""
],
[
"Angom",
"D.",
""
]
] | [
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] |
802.157 | Mark McDonnell | Mark D. McDonnell and Nigel G. Stocks | Maximally Informative Stimuli and Tuning Curves for Sigmoidal
Rate-Coding Neurons and Populations | Accepted by Physical Review Letters. This revision updates figures
and text | Physical Review Letters 101, 058103, 2008 | 10.1103/PhysRevLett.101.058103 | null | q-bio.NC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general method for deriving maximally informative sigmoidal tuning curves
for neural systems with small normalized variability is presented. The optimal
tuning curve is a nonlinear function of the cumulative distribution function of
the stimulus and depends on the mean-variance relationship of the neural
system. The derivation is based on a known relationship between Shannon's
mutual information and Fisher information, and the optimality of Jeffrey's
prior. It relies on the existence of closed-form solutions to the converse
problem of optimizing the stimulus distribution for a given tuning curve. It is
shown that maximum mutual information corresponds to constant Fisher
information only if the stimulus is uniformly distributed. As an example, the
case of sub-Poisson binomial firing statistics is analyzed in detail.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 06:32:48 GMT"
},
{
"version": "v2",
"created": "Thu, 15 May 2008 00:47:03 GMT"
},
{
"version": "v3",
"created": "Fri, 4 Jul 2008 01:13:59 GMT"
}
] | 2008-08-02T00:00:00 | [
[
"McDonnell",
"Mark D.",
""
],
[
"Stocks",
"Nigel G.",
""
]
] | [
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802.1571 | Mihran Papikian | Mihran Papikian | On the eigenvalues of p-adic curvature | 10 pages | null | null | null | math.CO math.NT math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the maximal eigenvalue of the p-adic curvature transformations
on Bruhat-Tits buildings, and we give an essentially optimal upper bound on the
minimal non-zero eigenvalue of these transformations.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 06:39:00 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Papikian",
"Mihran",
""
]
] | [
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] |
802.1572 | Dong-Won Jung | Dong-Won Jung, Kang Young Lee | Production of the charged Higgs bosons at the CERN Large Hadron Collider
in the left-right symmetric model | The version which will appear in PRD. References are added | Phys.Rev.D78:015022,2008 | 10.1103/PhysRevD.78.015022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of the charged Higgs boson at the LHC in the
left-right symmetric model. It is shown that there exists a lower bound of the
cross section. We investigate that predicted cross sections of this model are
generally larger than those of the two Higgs doublet model or the minimal
supersymmetric model.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 06:39:51 GMT"
},
{
"version": "v2",
"created": "Tue, 13 May 2008 09:31:40 GMT"
},
{
"version": "v3",
"created": "Mon, 30 Jun 2008 07:50:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jung",
"Dong-Won",
""
],
[
"Lee",
"Kang Young",
""
]
] | [
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] |
802.1573 | Victor Alexandrov | Victor Alexandrov | Sobolev Institute of Mathematics Celebrates its Fiftieth Anniversary | 6 pages, 2 photos | Notices of the AMS. 54 (2007), 1512-1514 | null | null | math.HO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper describes briefly history and current state of the Sobolev
Institute of Mathematics, the biggest research mathematical institute of the
Russian Academy of Sciences located east to Ural mountains.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 06:43:57 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Alexandrov",
"Victor",
""
]
] | [
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] |
802.1574 | Akira Sugawara | Akira Sugawara, H. Kasai, A. Tonomura, P. D. Brown, R. P. Campion,
K.W. Edmonds, B. L. Gallagher, J. Zemen, and T. Jungwirth | Domain walls in (Ga,Mn)As diluted magnetic semiconductor | 5 pages, 4 figures | Physical Review Letter, 100, 047202 (2008) | 10.1103/PhysRevLett.100.047202 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report experimental and theoretical studies of magnetic domain walls in an
in-plane magnetized (Ga,Mn)As dilute moment ferromagnetic semiconductor. Our
high-resolution electron holography technique provides direct images of domain
wall magnetization profiles. The experiments are interpreted based on
microscopic calculations of the micromagnetic parameters and
Landau-Lifshitz-Gilbert simulations. We find that the competition of uniaxial
and biaxial magnetocrystalline anisotropies in the film is directly reflected
in orientation dependent wall widths, ranging from approximately 40 nm to 120
nm. The domain walls are of the N\'eel type and evolve from near-$90^{\circ}$
walls at low-temperatures to large angle [1$\bar{1}$0]-oriented walls and small
angle [110]-oriented walls at higher temperatures.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 06:50:49 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Sugawara",
"Akira",
""
],
[
"Kasai",
"H.",
""
],
[
"Tonomura",
"A.",
""
],
[
"Brown",
"P. D.",
""
],
[
"Campion",
"R. P.",
""
],
[
"Edmonds",
"K. W.",
""
],
[
"Gallagher",
"B. L.",
""
],
[
"Zemen",
"J.",
""
],
[
"Jungwirth",
"T.",
""
]
] | [
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] |
802.1575 | Shin-Ichiro Nagahiro | Shin-ichiro Nagahiro and Yoshinori Hayakawa | Bending-Filament Model for the Buckling and Coiling Instability of
Viscous Fluid Rope | 4 pages, 6 figures | null | 10.1103/PhysRevE.78.025302 | null | cond-mat.stat-mech cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple model is proposed for the buckling and coiling instability of a
viscous "fluid rope" falling on a plane. By regarding a fluid rope as a
one-dimensional flow, this model accounts for only the axial and shared viscous
forces. Our model successfully reproduces several experiments with no
adjustable parameters, such as the existence of three distinct coiling regimes
reported in Phys. Rev. Lett. 93, 214502 (2004). Our model allows for the
discussion of unsteady motion. An expression for the critical fall height at
which the coiling frequency changes from a decrease to increase was
phenomenologically derived. It was found that the coil-uncoil transition shows
remarkable hysteresis only for weak gravity condition.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 07:05:13 GMT"
},
{
"version": "v2",
"created": "Fri, 23 May 2008 10:08:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nagahiro",
"Shin-ichiro",
""
],
[
"Hayakawa",
"Yoshinori",
""
]
] | [
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] |
802.1576 | Kumar S. Gupta | T. R. Govindarajan, Kumar S. Gupta, E. Harikumar, S. Meljanac and D.
Meljanac | Twisted Statistics in kappa-Minkowski Spacetime | Latex file, 8 pages | Phys.Rev.D77:105010,2008 | 10.1103/PhysRevD.77.105010 | SINP/TNP/2008/02 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the issue of statistics for identical particles or fields in
kappa-deformed spaces, where the system admits a symmetry group G. We obtain
the twisted flip operator compatible with the action of the symmetry group,
which is relevant for describing particle statistics in presence of the
noncommutativity. It is shown that for a special class of realizations, the
twisted flip operator is independent of the ordering prescription.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 07:14:46 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Mar 2008 04:48:42 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Govindarajan",
"T. R.",
""
],
[
"Gupta",
"Kumar S.",
""
],
[
"Harikumar",
"E.",
""
],
[
"Meljanac",
"S.",
""
],
[
"Meljanac",
"D.",
""
]
] | [
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] |
802.1577 | Jean Dolbeault | Jean Dolbeault (CEREMADE), Patricio Felmer (DIM), Mathieu Lewin (AGM) | Stability of the Hartree-Fock model with temperature | null | Mathematical Models and Methods in Applied Sciences 19, 3 (2009)
347-367 | null | null | math.AP | null | This paper is devoted to the Hartree-Fock model with temperature in the
euclidean space. For large classes of free energy functionals, minimizers are
obtained as long as the total charge of the system does not exceed a threshold
which depends on the temperature. The usual Hartree-Fock model is recovered in
the zero temperature limit. An orbital stability result for the Cauchy problem
is deduced from the variational approach.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 07:24:59 GMT"
}
] | 2009-04-01T00:00:00 | [
[
"Dolbeault",
"Jean",
"",
"CEREMADE"
],
[
"Felmer",
"Patricio",
"",
"DIM"
],
[
"Lewin",
"Mathieu",
"",
"AGM"
]
] | [
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] |
802.1578 | Kees Middelburg | J. A. Bergstra, C. A. Middelburg | Thread extraction for polyadic instruction sequences | 21 pages; error corrected; presentation improved | Scientific Annals of Computer Science, 21(2):283--310, 2011.
http://www.infoiasi.ro/bin/download/Annals/XXI2/XXI2_4.pdf | null | PRG0803 | cs.PL | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the phenomenon that instruction sequences are split
into fragments which somehow produce a joint behaviour. In order to bring this
phenomenon better into the picture, we formalize a simple mechanism by which
several instruction sequence fragments can produce a joint behaviour. We also
show that, even in the case of this simple mechanism, it is a non-trivial
matter to explain by means of a translation into a single instruction sequence
what takes place on execution of a collection of instruction sequence
fragments.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 07:49:27 GMT"
},
{
"version": "v2",
"created": "Wed, 28 Jan 2009 08:59:16 GMT"
},
{
"version": "v3",
"created": "Tue, 28 Jul 2009 07:07:45 GMT"
}
] | 2012-11-20T00:00:00 | [
[
"Bergstra",
"J. A.",
""
],
[
"Middelburg",
"C. A.",
""
]
] | [
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] |
802.1579 | Yuki Nagai | Yuki Nagai and Nobuhiko Hayashi | Kramer-Pesch approximation for analyzing field-angle-resolved
measurements made in unconventional superconductors: A calculation of the
zero-energy density of states | 5 pages, 4 figures | Phys. Rev. Lett. 101 (2008) 097001 | 10.1103/PhysRevLett.101.097001 | null | cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By measuring angular-oscillation behavior of the heat capacity with respect
to the applied field direction, one can detect the details of the gap
structure. We introduce the Kramer-Pesch approximation (KPA) as a new method to
analyze the field-angle-dependent experiments quantitatively. We calculate the
zero energy density of states for various combinations of typical Fermi
surfaces and superconducting gaps. The KPA yields a merit that one can
quantitatively compare theoretical calculations with experimental results
without involving heavy numerical computations, even for complicated Fermi
surfaces. We show an inadequacy of the frequently-used Doppler-shift technique,
which is remedied by application of the KPA.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 07:53:10 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Aug 2008 04:01:17 GMT"
}
] | 2008-08-29T00:00:00 | [
[
"Nagai",
"Yuki",
""
],
[
"Hayashi",
"Nobuhiko",
""
]
] | [
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] |
802.158 | Bhaswar Ghosh | Kamakshi Sureka, Bhaswar Ghosh, Arunava Dasgupta, Joyoti Basu,
Manikuntala Kundu and Indrani Bose | Positive feedback and noise activate the stringent response regulator
Rel in mycobacteria | Accepted for publication in PLoS One | null | 10.1371/journal.pone.0001771 | null | q-bio.MN q-bio.CB | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Phenotypic heterogeneity in an isogenic, microbial population enables a
subset of the population to persist under stress. In mycobacteria, stresses
like nutrient and oxygen deprivation activate the stress response pathway
involving the two-component system MprAB and the sigma factor, SigE. SigE in
turn activates the expression of the stringent response regulator, rel. The
enzyme polyphosphate kinase 1 (PPK1) regulates this pathway by synthesizing
polyphosphate required for the activation of MprB. The precise manner in which
only a subpopulation of bacterial cells develops persistence, remains unknown.
Rel is required for mycobacterial persistence. Here we show that the
distribution of rel expression levels in a growing population of mycobacteria
is bimodal with two distinct peaks corresponding to low (L) and high (H)
expression states, and further establish that a positive feedback loop
involving the mprAB operon along with stochastic gene expression are
responsible for the phenotypic heterogeneity. Combining single cell analysis by
flow cytometry with theoretical modeling, we observe that during growth,
noise-driven transitions take a subpopulation of cells from the L to the H
state within a "window of opportunity" in time preceding the stationary phase.
We find evidence of hysteresis in the expression of rel in response to changing
concentrations of PPK1. Our results provide, for the first time, evidence that
bistability and stochastic gene expression could be important for the
development of "heterogeneity with an advantage" in mycobacteria.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 08:02:04 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Sureka",
"Kamakshi",
""
],
[
"Ghosh",
"Bhaswar",
""
],
[
"Dasgupta",
"Arunava",
""
],
[
"Basu",
"Joyoti",
""
],
[
"Kundu",
"Manikuntala",
""
],
[
"Bose",
"Indrani",
""
]
] | [
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] |
802.1581 | Vasiliev Boris | B.V.Vasiliev | The physical approach to the hot star description | null | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theoretical discription of a hot star interior is obtained. It explains
the distribution of stars over their masses, mass-radius-temperature and
mass-luminosity dependencies. The theory of the apsidal rotation of binary
stars and the spectrum of solar oscillation is considered. All obrained
theoretical predictions are in a good agreement with the known measurement
data, which confirms the validity of this consideration.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 08:03:20 GMT"
},
{
"version": "v10",
"created": "Thu, 22 Jan 2009 15:44:18 GMT"
},
{
"version": "v11",
"created": "Wed, 28 Jan 2009 07:13:09 GMT"
},
{
"version": "v12",
"created": "Mon, 2 Feb 2009 13:20:58 GMT"
},
{
"version": "v13",
"created": "Tue, 3 Feb 2009 17:18:42 GMT"
},
{
"version": "v14",
"created": "Sun, 19 Apr 2009 03:22:49 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Feb 2008 10:42:28 GMT"
},
{
"version": "v3",
"created": "Mon, 17 Mar 2008 10:20:29 GMT"
},
{
"version": "v4",
"created": "Fri, 28 Mar 2008 17:45:13 GMT"
},
{
"version": "v5",
"created": "Thu, 26 Jun 2008 04:50:44 GMT"
},
{
"version": "v6",
"created": "Thu, 9 Oct 2008 12:13:03 GMT"
},
{
"version": "v7",
"created": "Fri, 10 Oct 2008 09:26:03 GMT"
},
{
"version": "v8",
"created": "Sun, 4 Jan 2009 14:46:38 GMT"
},
{
"version": "v9",
"created": "Sun, 11 Jan 2009 15:15:44 GMT"
}
] | 2009-04-19T00:00:00 | [
[
"Vasiliev",
"B. V.",
""
]
] | [
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802.1582 | Strecka Jozef | Jozef Strecka, Lucia Canova, Michal Jascur, Masayuki Hagiwara | Exact solution of the geometrically frustrated spin-1/2 Ising-Heisenberg
model on the triangulated Kagome (triangles-in-triangles) lattice | 13 pages, 7 figures, submitted to Phys. Rev. B | Phys. Rev. B 78 (2008) 024427 | 10.1103/PhysRevB.78.024427 | null | cond-mat.stat-mech cond-mat.dis-nn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geometric frustration of the spin-1/2 Ising-Heisenberg model on the
triangulated Kagome (triangles-in-triangles) lattice is investigated within the
framework of an exact analytical method based on the generalized star-triangle
mapping transformation. Ground-state and finite-temperature phase diagrams are
obtained along with other exact results for the partition function, Helmholtz
free energy, internal energy, entropy, and specific heat, by establishing a
precise mapping relationship to the corresponding spin-1/2 Ising model on the
Kagome lattice. It is shown that the residual entropy of the disordered spin
liquid phase is for the quantum Ising-Heisenberg model significantly lower than
for its semi-classical Ising limit (S_0/N_T k_B = 0.2806 and 0.4752,
respectively), which implies that quantum fluctuations partially lift a
macroscopic degeneracy of the ground-state manifold in the frustrated regime.
The investigated model system has an obvious relevance to a series of polymeric
coordination compounds Cu_9X_2(cpa)_6 (X=F, Cl, Br and cpa=carboxypentonic
acid) for which we made a theoretical prediction about the temperature
dependence of zero-field specific heat.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 08:08:11 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Apr 2008 13:51:39 GMT"
},
{
"version": "v3",
"created": "Tue, 3 Jun 2008 14:27:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Strecka",
"Jozef",
""
],
[
"Canova",
"Lucia",
""
],
[
"Jascur",
"Michal",
""
],
[
"Hagiwara",
"Masayuki",
""
]
] | [
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802.1583 | Salvatore Capozziello | S. Capozziello, V.F. Cardone, V. Salzano | Cosmography of f(R) gravity | 18 pages, 4 figures | Phys.Rev.D78:063504,2008 | 10.1103/PhysRevD.78.063504 | null | astro-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is nowadays accepted that the universe is undergoing a phase of
accelerated expansion as tested by the Hubble diagram of Type Ia Supernovae
(SNeIa) and several LSS observations. Future SNeIa surveys and other probes
will make it possible to better characterize the dynamical state of the
universe renewing the interest in cosmography which allows a model independent
analysis of the distance - redshift relation. On the other hand, fourth order
theories of gravity, also referred to as $f(R)$ gravity, have attracted a lot
of interest since they could be able to explain the accelerated expansion
without any dark energy. We show here how it is possible to relate the
cosmographic parameters (namely the deceleration $q_0$, the jerk $j_0$, the
snap $s_0$ and the lerk $l_0$ parameters) to the present day values of $f(R)$
and its derivatives $f^{(n)}(R) = d^nf/dR^n$ (with $n = 1, 2, 3$) thus offering
a new tool to constrain such higher order models. Our analysis thus offers the
possibility to relate the model independent results coming from cosmography to
the theoretically motivated assumptions of $f(R)$ cosmology.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 08:16:44 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jul 2008 15:30:24 GMT"
}
] | 2009-02-20T00:00:00 | [
[
"Capozziello",
"S.",
""
],
[
"Cardone",
"V. F.",
""
],
[
"Salzano",
"V.",
""
]
] | [
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] |
802.1584 | Jean-Francois Donati | J. F. Donati, C. Moutou, R. Fares, D. Bohlender, C. Catala, M.
Deleuil, E. Shkolnik, A. C. Cameron, M. M. Jardine, G. A. H. Walker | Magnetic cycles of the planet-hosting star tauBootis | MNRAS, in press | null | 10.1111/j.1365-2966.2008.12946.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have obtained new spectropolarimetric observations of the planet-hosting
star tauBootis, using the ESPaDOnS and NARVAL spectropolarimeters at the
Canada-France-Hawaii Telescope and Telescope Bernard-Lyot. With this data set,
we are able to confirm the presence of a magnetic field at the surface of
tauBoo and map its large-scale structure over the whole star. The overall
polarity of the magnetic field has reversed with respect to our previous
observation (obtained a year before), strongly suggesting that tauBoo is
undergoing magnetic cycles similar to those of the Sun. This is the first time
that a global magnetic polarity switch is observed in a star other than the
Sun; we speculate that the magnetic cycle period of tauBoo is much shorter than
that of the Sun.
Our new data also allow us to confirm the presence of differential rotation
from the latitudinal shearing that the magnetic structure is undergoing. The
differential rotation surface shear that tauBoo experiences is found to be 6 to
10 times larger than that of the Sun. We propose that the short magnetic cycle
period is due to the strong level of differential rotation. With a rotation
period of 3.0 and 3.9 d at the equator and pole respectively, tauBoo appears as
the first planet-hosting star whose rotation (at intermediate latitudes) is
synchronised with the orbital motion of its giant planet (period 3.3 d).
Assuming that this synchronisation is not coincidental, it suggests that the
tidal effects induced by the giant planet can be strong enough to force the
thin convective enveloppe (though not the whole star) into corotation and thus
to play a role in the activity cycle of tauBoo.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 08:27:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Donati",
"J. F.",
""
],
[
"Moutou",
"C.",
""
],
[
"Fares",
"R.",
""
],
[
"Bohlender",
"D.",
""
],
[
"Catala",
"C.",
""
],
[
"Deleuil",
"M.",
""
],
[
"Shkolnik",
"E.",
""
],
[
"Cameron",
"A. C.",
""
],
[
"Jardine",
"M. M.",
""
],
[
"Walker",
"G. A. H.",
""
]
] | [
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] |
802.1585 | Daniel Steck | Jeremy J. Thorn, Elizabeth A. Schoene, Tao Li, and Daniel A. Steck | Experimental Realization of an Optical One-Way Barrier for Neutral Atoms | 5 pages, 4 figures; includes changes to address referee comments | null | 10.1103/PhysRevLett.100.240407 | null | physics.atom-ph | null | We demonstrate an asymmetric optical potential barrier for ultracold 87 Rb
atoms using laser light tuned near the D_2 optical transition. Such a one-way
barrier, where atoms impinging on one side are transmitted but reflected from
the other, is a realization of Maxwell's demon and has important implications
for cooling atoms and molecules not amenable to standard laser-cooling
techniques. In our experiment, atoms are confined to a far-detuned dipole trap
consisting of a single focused Gaussian beam, which is divided near the focus
by the barrier. The one-way barrier consists of two focused laser beams
oriented almost normal to the dipole-trap axis. The first beam is tuned to have
a red (blue) detuning from the F=1 -> F' (F=2 -> F') hyperfine transitions, and
thus presents a barrier only for atoms in the F=2 ground state, while letting
F=1 atoms pass. The second beam pumps the atoms to F=2 on the reflecting side
of the barrier, thus producing the asymmetry.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:37:45 GMT"
},
{
"version": "v2",
"created": "Sat, 24 May 2008 02:00:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Thorn",
"Jeremy J.",
""
],
[
"Schoene",
"Elizabeth A.",
""
],
[
"Li",
"Tao",
""
],
[
"Steck",
"Daniel A.",
""
]
] | [
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] |
802.1586 | Mark Burgess | Demissies Aredo, Mark Burgess and Simen Hagen | Program Promises | null | null | null | null | cs.SE | null | The framework of promise theory offers an alternative way of understanding
programming models, especially in distributed systems. We show that promise
theory can express some familiar constructs and resolve some problems in
program interface design, using fewer and simpler concepts than the Unified
Modelling Language (UML).
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 08:40:51 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Aredo",
"Demissies",
""
],
[
"Burgess",
"Mark",
""
],
[
"Hagen",
"Simen",
""
]
] | [
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802.1587 | Halton Arp | H. Arp, C. Fulton | A Cluster of High Redshift Quasars with Apparent Diameter 2.3 Degrees | 7 pages, 3 Figures | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During analysis of the relation of quasars to galaxies in the 2dF deep field
a concentration of quasars was noted. Most striking was the closeness in
redshift of 14 quasars about the mean redshift z = 2.149 with a range of $\pm
0.018$. The cluster in spite of its high redshift subtends an area of diameter
more than 2.3 degrees on the sky. At conventional redshift distance its
diameter would be 181 mega parsecs and the back should be receding with about
$10,000 km/s$ with respect to the front.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 08:34:56 GMT"
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] | 2008-02-13T00:00:00 | [
[
"Arp",
"H.",
""
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802.1588 | Robert Brout | R. Brout | Entanglement and Thermodynamics of Black Hole Entropy | 5 pages | Int.J.Mod.Phys.D17:2549-2553,2009 | 10.1142/S0218271808014187 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using simple conditions drawn from the stability of the cosmos in terms of
vacuum energy density, the cut-off momentum of entanglement is related to the
planckian mass. In so doing the black hole entropy is shown to be independent
of the number of field species that contribute to vacuum fluctuations. And this
is in spite of the fact that the number of field species is a linear
multiplicand of the entanglement entropy when this latter is expressed in terms
of the fundamental momentum cut-off of all fields.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 18:34:12 GMT"
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] | 2009-03-20T00:00:00 | [
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802.1589 | Biswajoy Brahmachari | Biswajoy Brahmachari | Orbifold GUT model with nine Higgs doublets | Plenary Talk at International Workshop on Grand Unified Theories:
Current Status and Future Prospects, Ritsumeikan University, Japan, Dec
17-19, 2007 | AIPConf.Proc.1015:193-197,2008 | 10.1063/1.2939051 | null | hep-ph | null | We describe a non-supersymmetric orbifold GUT based on SU(5) symmetry. It is
a modification of Kawamura's 5-D orbifold GUT model. The difference lies in the
choice of Higgs scalars as we have allowed only 5-plets of SU(5) in the GUT
scale. This variant was originally proposed by Brahmachari and Raychoudhuri.
Proton decay problem and the doublet triplet splitting problems are solved by
extra dimensional mechanism. The unification scale is around $5.0 \times
10^{13}$ GeVs. In low energy there are nine Higgs doublets. One at the 100 GeV
region and eight others degenerate at around 1.4 TeV. It is an attractive
non-supersymmetric extension of standard model with very rich collider physics
phenomenology.
| [
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{
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"created": "Sun, 24 Feb 2008 03:18:30 GMT"
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] | 2008-11-26T00:00:00 | [
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] |
802.159 | Toshiyuki Tanisaki | Toshiyuki Tanisaki | Poisson Hopf algebras associated to quantized enveloping algebras | 40pages | null | null | null | math.QA math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study certain Poisson structures related to quantized enveloping algebras.
In particular, we give a description of the Poisson structure of a certain
manifold associated to the ring of differential operators.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 08:59:30 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 08:00:37 GMT"
}
] | 2008-03-03T00:00:00 | [
[
"Tanisaki",
"Toshiyuki",
""
]
] | [
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802.1591 | Mercedes Siles | Francesc Perera and Mercedes Siles Molina | Strongly nondegenerate Lie algebras | 9 pgs. To appear in the Proc. of the AMS | null | null | null | math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $A$ be a semiprime 2 and 3-torsion free non-commutative associative
algebra. We show that the Lie algebra $\der(A)$ of (associative) derivations of
$A$ is strongly non-degenerate, which is a strong form of semiprimeness for Lie
algebras, under some additional restrictions on the center of $A$. This result
follows from a description of the quadratic annihilator of a general Lie
algebra inside appropriate Lie overalgebras. Similar results are obtained for
an associative algebra $A$ with involution and the Lie algebra $\sder(A)$ of
involution preserving derivations of $A$.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:03:20 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Perera",
"Francesc",
""
],
[
"Molina",
"Mercedes Siles",
""
]
] | [
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802.1592 | Rodion Neigovzen | Rodion Neigovzen, Jorge L. Neves, Rudolf Sollacher, Steffen J. Glaser | Quantum pattern recognition with liquid-state nuclear magnetic resonance | updated version, Journal-ref added | Phys. Rev. A 79, 042321 (2009) | 10.1103/PhysRevA.79.042321 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel quantum pattern recognition scheme is presented, which combines the
idea of a classic Hopfield neural network with adiabatic quantum computation.
Both the input and the memorized patterns are represented by means of the
problem Hamiltonian. In contrast to classic neural networks, the algorithm can
return a quantum superposition of multiple recognized patterns. A proof of
principle for the algorithm for two qubits is provided using a liquid state NMR
quantum computer.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:06:42 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 14:12:14 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Oct 2008 14:04:24 GMT"
},
{
"version": "v4",
"created": "Mon, 20 Apr 2009 14:58:39 GMT"
}
] | 2009-04-20T00:00:00 | [
[
"Neigovzen",
"Rodion",
""
],
[
"Neves",
"Jorge L.",
""
],
[
"Sollacher",
"Rudolf",
""
],
[
"Glaser",
"Steffen J.",
""
]
] | [
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] |
802.1593 | Javier Parcet | Marius Junge, Javier Parcet | A transference method in quantum probability | 42 pages | null | null | null | math.OA math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Working with a rather general notion of independence, we provide a
transference method which allows to compare the p-norm of sums of independent
copies with the p-norm of sums of free copies. Our main technique is to
construct explicit operator space Lp embeddings preserving independence to
reduce the problem to L1, where some recent results by the first-named author
can be used. We find applications for noncommutative Khincthine/Rosenthal type
inequalities and for noncommutative Lp embedding theory.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 19:17:51 GMT"
},
{
"version": "v2",
"created": "Wed, 3 Mar 2010 07:34:47 GMT"
}
] | 2010-03-03T00:00:00 | [
[
"Junge",
"Marius",
""
],
[
"Parcet",
"Javier",
""
]
] | [
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] |
802.1594 | Lina Levin | Sara Fogelstr\"om, Lina Levin, Rikard Slapak | Local Analysis of Nonlinear Oscillations of Thin Accretion Disks | 15 pages, to be published in PASJ Vol. 60 No. 3 | Publ. Astron. Soc. Japan 60, pp.605-612 (2008) | 10.1093/pasj/60.3.605 | null | astro-ph | null | We calculated the coupling coefficients for non-linear, quasi-local
oscillatory modes of thin accretion disks. We found that several of them are
non-zero. Mode coupling is a necessary condition for a resonance, and thus our
results may be relevant for the recently discussed QPO resonance model.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:34:32 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Fogelström",
"Sara",
""
],
[
"Levin",
"Lina",
""
],
[
"Slapak",
"Rikard",
""
]
] | [
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] |
802.1595 | Cyrille Barreteau | Gabriel Autes (SPCSI), Cyrille Barreteau (SPCSI), Marie-Catherine
Desjonqu\`eres (SPCSI), Daniel Spanjaard (LPS), Michel Viret (SPEC) | Giant orbital moments are responsible for the anisotropic
magnetoresistance of atomic contacts | null | null | 10.1209/0295-5075/83/17010 | null | cond-mat.other | null | We study here, both experimentally and theoretically, the anisotropy of
magnetoresistance in atomic contacts. Our measurements on iron break junctions
reveal an abrupt and hysteretic switch between two conductance levels when a
large applied field is continuously rotated. We show that this behaviour stems
from the coexistence of two metastable electronic states which result from the
anisotropy of electronic interactions responsible for the enhancement of
orbital magnetization. In both states giant orbital moments appear on the low
coordinated central atom in a realistic contact geometry. However they differ
by their orientation, parallel or perpendicular, with respect to the axis of
the contact. Our explanation is totally at variance with the usual model based
on the band structure of a monatomic linear chain, which we argue cannot be
applied to 3d ferromagnetic metals.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:13:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Autes",
"Gabriel",
"",
"SPCSI"
],
[
"Barreteau",
"Cyrille",
"",
"SPCSI"
],
[
"Desjonquères",
"Marie-Catherine",
"",
"SPCSI"
],
[
"Spanjaard",
"Daniel",
"",
"LPS"
],
[
"Viret",
"Michel",
"",
"SPEC"
]
] | [
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] |
802.1596 | Robabeh Rahimi Darabad | Robabeh Rahimi, Akira SaiToh, Mikio Nakahara | Coherence Conservation of a Qubit Coupled to a Thermal Dissipating
Environment | 7 pages, 3 figures | Int. J. Quant. Inf. 6, Supp. 1, pp.779-785 (2008) | 10.1142/S0219749908004109 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that quantum coherence is conserved in a principal system in the
case that the system is coupled to a fast dissipating environment
[arXiv:0709.0562]. The phenomenon is called the quantum wipe effect. Here, this
effect is reviewed and the analytical proof for a model system consisting of a
one-qubit system coupled to a fast dissipating environment is extended to an
environment at a thermal equilibrium.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:15:03 GMT"
}
] | 2008-08-06T00:00:00 | [
[
"Rahimi",
"Robabeh",
""
],
[
"SaiToh",
"Akira",
""
],
[
"Nakahara",
"Mikio",
""
]
] | [
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] |
802.1597 | Francesca Da Lio | Francesca Da Lio | Partial Regularity for Stationary Solutions to Liouville-Type Equation
in dimension 3 | 20 pages | null | null | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In dimension $n=3$, we prove that the singular set of any stationary solution
to the Liouville equation $-\Delta u=e^u$, which belongs to $W^{1,2}$, has
Hausdorff dimension at most 1.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:15:14 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Da Lio",
"Francesca",
""
]
] | [
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802.1598 | Cyrille Barreteau | Gabriel Autes (SPCSI), Cyrille Barreteau (SPCSI), Daniel Spanjaard
(LPS), Marie-Catherine Desjonqu\`eres (SPCSI) | Electronic transport in iron atomic contacts: from the infinite wire to
realistic geometries | null | null | 10.1103/PhysRevB.77.155437 | null | cond-mat.other | null | We present a theoretical study of spin polarized transport in Fe atomic
contacts using a self-consistent tight-binding Hamiltonian in a non-orthogonal
$s$, $p$ and $d$ basis set, the spin-polarization being obtained from a
non-collinear Stoner-like model and the transmission probability from the
Fisher-Lee formula. The behaviour of an infinite perfect Fe wire is compared
with that of an infinite chain presenting geometric defects or magnetic walls
and with that of a finite chain connected to infinite one-dimensional or
three-dimensional leads. In the presence of defects or contacts the
transmission probability of $d$ electrons is much more affected than that of
$s$ electrons, in particular, contact effects may suppress some transmission
channels. It is shown that the behaviour of an infinite wire is never obtained
even in the limit of long chains connected to electrodes. The introduction of
the spin-orbit coupling term in the Hamiltonian enables us to calculate the
anisotropy of the magneto-resistance. Finally whereas the variation of the
magneto-resistance as a function of the magnetization direction is step-like
for an infinite wire, it becomes smooth in the presence of defects or contacts.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:15:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Autes",
"Gabriel",
"",
"SPCSI"
],
[
"Barreteau",
"Cyrille",
"",
"SPCSI"
],
[
"Spanjaard",
"Daniel",
"",
"LPS"
],
[
"Desjonquères",
"Marie-Catherine",
"",
"SPCSI"
]
] | [
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802.1599 | A. Yu. Ignatiev | A. Yu. Ignatiev | Newton's second law versus modified-inertia MOND: a test using the
high-latitude effect | 15 pages, 1 figure | Phys.Rev.D77:102001,2008 | 10.1103/PhysRevD.77.102001 | null | gr-qc astro-ph hep-ph | null | The modified-inertia MOND is an approach that proposes a change in Newton's
second law at small accelerations as an alternative to dark matter. Recently it
was suggested that this approach can be tested in terrestrial laboratory
experiments. One way of doing the test is based on the Static High-Latitude
Equinox Modified Inertia (SHLEM) effect: around each equinox date, 2 spots
emerge on the Earth where static bodies experience spontaneous displacement due
to the violation of Newton's second law required by the modified-inertia MOND.
Here, a detailed theory of this effect is developed and estimates of the
magnitude of the signal due to the effect are obtained. The expected
displacement of a mirror in a gravitational wave interferometer is found to be
about 10^{-14} m. Some experimental aspects of the proposal are discussed.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 11:22:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ignatiev",
"A. Yu.",
""
]
] | [
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] |
802.16 | Michele Tumminello | Mi. Tumminello, F. Lillo, R. N. Mantegna | Generation of hierarchically correlated multivariate symbolic sequences | 7 pages, 6 figures, 1 table | Eur. Phys. J. B 65 (3): 333-340 (2008) | 10.1140/epjb/e2008-00225-7 | null | physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an algorithm to generate multivariate series of symbols from a
finite alphabet with a given hierarchical structure of similarities. The target
hierarchical structure of similarities is arbitrary, for instance the one
obtained by some hierarchical clustering procedure as applied to an empirical
matrix of Hamming distances. The algorithm can be interpreted as the finite
alphabet equivalent of the recently introduced hierarchically nested factor
model (M. Tumminello et al. EPL 78 (3) 30006 (2007)). The algorithm is based on
a generating mechanism that is different from the one used in the mutation rate
approach. We apply the proposed methodology for investigating the relationship
between the bootstrap value associated with a node of a phylogeny and the
probability of finding that node in the true phylogeny.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:31:00 GMT"
}
] | 2008-10-08T00:00:00 | [
[
"Tumminello",
"Mi.",
""
],
[
"Lillo",
"F.",
""
],
[
"Mantegna",
"R. N.",
""
]
] | [
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-0.0372867845,
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] |
802.1601 | Jerome Martin | Martin Lemoine, Jerome Martin and Gregory Petit (IAP) | Curvaton Decay into Baryons, anti-Baryons and Radiation | 11 pages, 4 figures, published version | Phys.Rev.D78:063516,2008 | 10.1103/PhysRevD.78.063516 | null | astro-ph gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper calculates the amount of baryon/radiation isocurvature fluctuation
produced through the decay of a curvaton field. It is shown in particular that
if curvaton decay preserves baryon number and the curvaton dominates the energy
density at the time of decay, the initial curvaton/radiation isocurvature mode
is entirely transfered into a baryon/radiation isocurvature mode. This
situation is opposite to that previously studied in three fluid models of
curvaton decay; this difference is related to the conservation of the
pre-existing baryon asymmetry and to the efficiency of the annihilation of all
baryon/anti-baryon pairs produced in the decay. We study in detail the relevant
cases in which the curvaton decay preserves or not baryon number and provide
analytical and numerical calculations for each situation.
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:37:13 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Oct 2008 08:29:17 GMT"
}
] | 2009-02-20T00:00:00 | [
[
"Lemoine",
"Martin",
"",
"IAP"
],
[
"Martin",
"Jerome",
"",
"IAP"
],
[
"Petit",
"Gregory",
"",
"IAP"
]
] | [
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802.1602 | Juan Nieves Dr. | J. Nieves, C. Garcia-Recio, L.L.Salcedo, V. Magas, A. Ramos, T.
Mizutani, H. Toki | Chiral SU(3) Bethe Salpeter Model: Extension to SU(6) and SU(8)
Spin-Flavor Symmetries | Presented at Chiral07: Chiral Symmetry in Hadron and Nuclear Physics
November 13-16, 2007, Osaka University, Japan | Mod.Phys.Lett.A23:2297-2300,2008 | 10.1142/S021773230802923X | null | hep-ph | null | Consistent SU(6) and SU(8) spin-flavor extensions of the SU(3) flavor
Weinberg-Tomozawa (WT) meson-baryon chiral Lagrangian are constructed, which
incorporate vector meson degrees of freedom. In the charmless sector, the
on-shell approximation to the Bethe-Salpeter (BS) approach successfully
reproduces previous SU(3) WT results for the lowest-lying s--wave negative
parity baryon resonances. It also provides some information on the dynamics of
heavier ones and of the lightest d-wave negative parity resonances, as e.g. the
Lambda(1520). For charmed baryons the scheme is consistent with heavy quark
symmetry, and our preliminary results in the strangeness-less charm C=+1 sector
describe the main features of the three-star J^P=1/2^- Lambda_c(2595) and
J^P=3/2^- Lambda_c(2625) resonances. We also find a second broad J^P=1/2^-
state close to the Lambda_c(2595)
| [
{
"version": "v1",
"created": "Tue, 12 Feb 2008 09:42:49 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 08:27:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nieves",
"J.",
""
],
[
"Garcia-Recio",
"C.",
""
],
[
"Salcedo",
"L. L.",
""
],
[
"Magas",
"V.",
""
],
[
"Ramos",
"A.",
""
],
[
"Mizutani",
"T.",
""
],
[
"Toki",
"H.",
""
]
] | [
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Subsets and Splits