id
stringlengths 9
16
| submitter
stringlengths 1
64
⌀ | authors
stringlengths 3
36.7k
| title
stringlengths 1
382
| comments
stringlengths 1
1.15k
⌀ | journal-ref
stringlengths 1
557
⌀ | doi
stringlengths 7
153
⌀ | report-no
stringlengths 1
479
⌀ | categories
stringlengths 5
125
| license
stringclasses 9
values | abstract
stringlengths 6
6.09k
| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.1298 | Yurij Holovatch | Yu. Holovatch, V.Palchykov | Mykyta the Fox and networks of language | An illustrative material from the paper submitted in Ukranian to the
Journal of Physical Studies (http://www.ktf.franko.lviv.ua/JPS/index.html) | J. Phys. Stud., vol. 10 (2006) 247-291 | null | null | physics.data-an physics.soc-ph | null | The results of quantitative analysis of word distribution in two fables in
Ukrainian by Ivan Franko: "Mykyta the Fox" and "Abu-Kasym's slippers" are
reported. Our study consists of two parts: the analysis of frequency-rank
distributions and the application of complex networks theory. The analysis of
frequency-rank distributions shows that the text sizes are enough to observe
statistical properties. The power-law character of these distributions (Zipf's
law) holds in the region of rank variable r=20 - 3000 with an exponent
$\alpha\simeq 1$. This substantiates the choice of the above texts to analyse
typical properties of the language complex network on their basis. Besides, an
applicability of the Simon model to describe non-asymptotic properties of word
distributions is evaluated.
In describing language as a complex network, usually the words are associated
with nodes, whereas one may give different meanings to the network links. This
results in different network representations. In the second part of the paper,
we give different representations of the language network and perform
comparative analysis of their characteristics. Our results demonstrate that the
language network of Ukrainian is a strongly correlated scale-free small world.
Empirical data obtained may be useful for theoretical description of language
evolution.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 14:27:34 GMT"
}
] | 2009-04-03T00:00:00 | [
[
"Holovatch",
"Yu.",
""
],
[
"Palchykov",
"V.",
""
]
] |
0705.1299 | Bernd Hezel | Bernd Hezel, Igor Lesanovsky, Peter Schmelcher | Ultracold Rydberg Atoms in a Ioffe-Pritchard Trap | 30 pages, 10 figures, added references, substantiation of
approximations | Phys. Rev. A 76, 053417 (2007) | 10.1103/PhysRevA.76.053417 | null | physics.atom-ph | null | We discuss the properties of ultracold Rydberg atoms in a Ioffe-Pritchard
magnetic field configuration. The derived two-body Hamiltonian unveils how the
large size of Rydberg atoms affects their coupling to the inhomogeneous
magnetic field. The properties of the compound electronic and center of mass
quantum states are thoroughly analyzed. We find very tight confinement of the
center of mass motion in two dimensions to be achievable while barely changing
the electronic structure compared to the field free case. This paves the way
for generating a one-dimensional ultracold quantum Rydberg gas.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 14:21:09 GMT"
},
{
"version": "v2",
"created": "Mon, 20 Aug 2007 22:38:06 GMT"
}
] | 2008-03-03T00:00:00 | [
[
"Hezel",
"Bernd",
""
],
[
"Lesanovsky",
"Igor",
""
],
[
"Schmelcher",
"Peter",
""
]
] |
0705.1300 | Bridget Tenner | Bridget Eileen Tenner | Domino Tiling Congruence Modulo 4 | final version, to appear in Graphs and Combinatorics | null | null | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The number of domino tilings of a region with reflective symmetry across a
line is combinatorially shown to depend on the number of domino tilings of
particular subregions, modulo 4. This expands upon previous congruency results
for domino tilings, modulo 2, and leads to a variety of corollaries, including
that the number of domino tilings of a k x 2k rectangle is congruent to 1 mod
4.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:30:28 GMT"
},
{
"version": "v2",
"created": "Tue, 12 May 2009 11:51:14 GMT"
}
] | 2009-05-12T00:00:00 | [
[
"Tenner",
"Bridget Eileen",
""
]
] |
0705.1301 | Michael Bebronne | Michael V. Bebronne, Peter G. Tinyakov | Massive gravity and structure formation | 8 pages | Phys.Rev.D76:084011,2007 | 10.1103/PhysRevD.76.084011 | ULB-TH/07-20 | astro-ph gr-qc hep-th | null | We study the growth of cosmological perturbations in the model of
Lorentz-violating massive gravity. The Friedman equation in this model acquires
an unconventional term due to the Lorentz-breaking condensates which has the
equation of state w = -1 / (3 gamma) with gamma being a free parameter taking
values outside of the range [0,1/3]. Apart from the standard contributions, the
perturbations above the Friedmann background contain an extra piece which is
proportional to an arbitrary function theta(x) of the space coordinates. This
function appears as an integration constant and corresponds to a
non-propagating scalar mode which may, however, become dynamical with the
account of the higher-derivative corrections. For -1 < gamma < 0 and gamma = 1
the ``anomalous'' perturbations grow slower than the standard ones and thus the
model is compatible with observations. Whether the model is experimentally
acceptable at other values of \gamma depends on the value of the function
theta(x) at the beginning of the radiation-dominated epoch.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 14:36:28 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 09:14:45 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Bebronne",
"Michael V.",
""
],
[
"Tinyakov",
"Peter G.",
""
]
] |
0705.1302 | Virginia Young | Moshe A. Milevsky, S. David Promislow, Virginia R. Young | Financial Valuation of Mortality Risk via the Instantaneous Sharpe
Ratio: Applications to Pricing Pure Endowments | JEL Classification: G13; G22; C60 | null | null | null | q-fin.PR math.AP math.OC | null | We develop a theory for pricing non-diversifiable mortality risk in an
incomplete market. We do this by assuming that the company issuing a
mortality-contingent claim requires compensation for this risk in the form of a
pre-specified instantaneous Sharpe ratio. We prove that our ensuing valuation
formula satisfies a number of desirable properties. For example, we show that
it is subadditive in the number of contracts sold. A key result is that if the
hazard rate is stochastic, then the risk-adjusted survival probability is
greater than the physical survival probability, even as the number of contracts
approaches infinity.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 14:44:48 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Milevsky",
"Moshe A.",
""
],
[
"Promislow",
"S. David",
""
],
[
"Young",
"Virginia R.",
""
]
] |
0705.1303 | Iorwerth Owain Thomas | A. S. Alexandrov, V. V. Kabanov, and I. O. Thomas | Interplay of size and Landau quantizations in the de Haas-van Alphen
oscillations of metallic nanowires | Title changed, paper streamlined on suggestion of referrees, typos
corrected, numerical error in figs 2 and 3 corrected and final result
simplified -- two not three frequencies (as in the previous version) are
observed. Abstract altered accordingly. Submitted to Physical Review B | Physical Review B 76, 155417 (2007) with some typos fixed | 10.1103/PhysRevB.76.155417 | null | cond-mat.mes-hall | null | We examine the interplay between size quantization and Landau quantization in
the De Haas-Van Alphen oscillations of clean, metallic nanowires in a
longitudinal magnetic field for `hard' boundary conditions, i.e. those of an
infinite round well, as opposed to the `soft' parabolically confined boundary
conditions previously treated in Alexandrov and Kabanov (Phys. Rev. Lett. {\bf
95}, 076601 (2005) (AK)). We find that there exist {\em two} fundamental
frequencies as opposed to the one found in bulk systems and the three
frequencies found by AK with soft boundary counditions. In addition, we find
that the additional `magic resonances' of AK may be also observed in the
infinite well case, though they are now damped. We also compare the numerically
generated energy spectrum of the infinite well potential with that of our
analytic approximation, and compare calculations of the oscillatory portions of
the thermodynamic quantities for both models.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 14:59:52 GMT"
},
{
"version": "v2",
"created": "Fri, 27 Jul 2007 13:29:33 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Alexandrov",
"A. S.",
""
],
[
"Kabanov",
"V. V.",
""
],
[
"Thomas",
"I. O.",
""
]
] |
0705.1304 | Eric Bergshoeff | E. Bergshoeff, I. De Baetselier, T. Nutma | E(11) and the Embedding Tensor | 16 pages, 13 tables; fixed typos, changed to JHEP style | JHEP 0709:047,2007 | 10.1088/1126-6708/2007/09/047 | UG-07-03, KUL-TF-07/10 | hep-th | null | We show how, using different decompositions of E(11), one can calculate the
representations under the duality group of the so--called "de-form" potentials.
Evidence is presented that these potentials are in one-to-one correspondence to
the embedding tensors that classify the gaugings of all maximal gauged
supergravities. We supply the computer program underlying our calculations.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:15:28 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 13:33:19 GMT"
},
{
"version": "v3",
"created": "Thu, 30 Aug 2007 13:19:45 GMT"
}
] | 2009-04-22T00:00:00 | [
[
"Bergshoeff",
"E.",
""
],
[
"De Baetselier",
"I.",
""
],
[
"Nutma",
"T.",
""
]
] |
0705.1305 | Giovanni Filatrella | Giovanni Filatrella, Arne Hejde Nielsen and Niels Falsig Pedersen | Analysis of a power grid using the Kuramoto-like model | 24 pages, including 7 figures. To appear on Eur. Phys. J. B | null | 10.1140/epjb/e2008-00098-8 | null | nlin.CD physics.soc-ph | null | We show that there is a link between the Kuramoto paradigm and another system
of synchronized oscillators, namely an electrical power distribution grid of
generators and consumers. The purpose of this work is to show both the formal
analogy and some practical consequences. The mapping can be made quantitative,
and under some necessary approximations a class of Kuramoto-like models, those
with bimodal distribution of the frequencies, is most appropriate for the
power-grid. In fact in the power-grid there are two kinds of oscillators: the
'sources' delivering power to the 'consumers'.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:24:04 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Feb 2008 15:31:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Filatrella",
"Giovanni",
""
],
[
"Nielsen",
"Arne Hejde",
""
],
[
"Pedersen",
"Niels Falsig",
""
]
] |
0705.1306 | B-G Andersson | B-G Andersson, S.B. Potter | Observational Constraints on Interstellar Grain Alignment | Accepted for publication in the Astrophysical Journal | Astrophys.J.665:369-389,2007 | 10.1086/519755 | null | astro-ph | null | We present new multicolor photo-polarimetry of stars behind the Southern
Coalsack. Analyzed together with multiband polarization data from the
literature, probing the Chamaeleon I, Musca, rho Opiuchus, R CrA and Taurus
clouds, we show that the wavelength of maximum polarization (lambda_max) is
linearly correlated with the radiation environment of the grains. Using
Far-Infrared emission data, we show that the large scatter seen in previous
studies of lambda_max as a function of A_V is primarily due to line of sight
effects causing some A_V measurements to not be a good tracer of the extinction
(radiation field strength) seen by the grains being probed. The derived slopes
in lambda_max vs. A_V, for the individual clouds, are consistent with a common
value, while the zero intercepts scale with the average values of the ratios of
total-to-selective extinction (R_V) for the individual clouds. Within each
cloud we do not find direct correlations between lambda_max and R_V. The
positive slope in consistent with recent developments in theory and indicating
alignment driven by the radiation field. The present data cannot conclusively
differentiate between direct radiative torques and alignment driven by H_2
formation. However, the small values of lambda_max(A_V=0), seen in several
clouds, suggest a role for the latter, at least at the cloud surfaces. The
scatter in the lambda_max vs. A_V relation is found to be associated with the
characteristics of the embedded Young Stellar Objects (YSO) in the clouds. We
propose that this is partially due to locally increased plasma damping of the
grain rotation caused by X-rays from the YSOs.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:51:13 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Andersson",
"B-G",
""
],
[
"Potter",
"S. B.",
""
]
] |
0705.1307 | Yohan Payan | Nicolas Vuillerme (TIMC - IMAG), Olivier Chenu (TIMC - IMAG), Jacques
Demongeot (TIMC - IMAG), Yohan Payan (TIMC - IMAG) | Controlling posture using a plantar pressure-based, tongue-placed
tactile biofeedback system | null | Experimental Brain Research 179, 3 (2007) 409-14 | 10.1007/s00221-006-0800-4 | null | physics.med-ph q-bio.NC | null | The present paper introduces an original biofeedback system for improving
human balance control, whose underlying principle consists in providing
additional sensory information related to foot sole pressure distribution to
the user through a tongue-placed tactile output device. To assess the effect of
this biofeedback system on postural control during quiet standing, ten young
healthy adults were asked to stand as immobile as possible with their eyes
closed in two conditions of No-biofeedback and Biofeedback. Centre of foot
pressure (CoP) displacements were recorded using a force platform. Results
showed reduced CoP displacements in the Biofeedback relative to the
No-biofeedback condition. The present findings evidenced the ability of the
central nervous system to efficiently integrate an artificial plantar-based,
tongue-placed tactile biofeedback for controlling control posture during quiet
standing.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:27:34 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Vuillerme",
"Nicolas",
"",
"TIMC - IMAG"
],
[
"Chenu",
"Olivier",
"",
"TIMC - IMAG"
],
[
"Demongeot",
"Jacques",
"",
"TIMC - IMAG"
],
[
"Payan",
"Yohan",
"",
"TIMC - IMAG"
]
] |
0705.1308 | Yu Zongwen | Zongwen Yu, Su Hu, and Chunlei Zhang | Quantify Entanglement for Multipartite Quantum States | 5 pages | null | null | null | quant-ph | null | In this paper, we consider the problem of how to quantify entanglement for
any multipartite quantum states. For bipartite pure states partial entropy is a
good entanglement measure. By using partial entropy, we firstly introduce the
Combinatorial Entropy of Fully entangled states (CEF) which can be used to
quantify entanglement for any fully entangled pure states. In order to quantify
entanglement for any multipartite states we also need another concept the
Entanglement Combination (EC) which can be used to completely describe the
entanglement between any parties of the given quantum states. Combining CEF
with EC, we define the Combinatorial Entropy (CE) for any multipartite pure
states and present some nice properties which indicate CE is a good
entanglement measure. Finally, we point out the feasibility of extending these
three concepts to mixed quantum states.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:33:09 GMT"
},
{
"version": "v2",
"created": "Sat, 12 May 2007 14:46:35 GMT"
},
{
"version": "v3",
"created": "Sat, 26 May 2007 15:37:30 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Yu",
"Zongwen",
""
],
[
"Hu",
"Su",
""
],
[
"Zhang",
"Chunlei",
""
]
] |
0705.1309 | Marc Schoenauer | Alexandre Devert (INRIA Futurs), Nicolas Bred\`eche (INRIA Futurs),
Marc Schoenauer (INRIA Futurs) | Robust Multi-Cellular Developmental Design | null | Dans Genetic and Evolutionary Computation COnference (2007) | null | null | cs.AI | null | This paper introduces a continuous model for Multi-cellular Developmental
Design. The cells are fixed on a 2D grid and exchange "chemicals" with their
neighbors during the growth process. The quantity of chemicals that a cell
produces, as well as the differentiation value of the cell in the phenotype,
are controlled by a Neural Network (the genotype) that takes as inputs the
chemicals produced by the neighboring cells at the previous time step. In the
proposed model, the number of iterations of the growth process is not
pre-determined, but emerges during evolution: only organisms for which the
growth process stabilizes give a phenotype (the stable state), others are
declared nonviable. The optimization of the controller is done using the NEAT
algorithm, that optimizes both the topology and the weights of the Neural
Networks. Though each cell only receives local information from its neighbors,
the experimental results of the proposed approach on the 'flags' problems (the
phenotype must match a given 2D pattern) are almost as good as those of a
direct regression approach using the same model with global information.
Moreover, the resulting multi-cellular organisms exhibit almost perfect
self-healing characteristics.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:33:34 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Devert",
"Alexandre",
"",
"INRIA Futurs"
],
[
"Bredèche",
"Nicolas",
"",
"INRIA Futurs"
],
[
"Schoenauer",
"Marc",
"",
"INRIA Futurs"
]
] |
0705.1310 | Helmut Hofer | Helmut Hofer, Kris Wysocki, Eduard Zehnder | A General Fredholm Theory II: Implicit Function Theorems | 102 pages, 3 figures | null | null | null | math.FA math.DG math.SG | null | This is the revised version of the second paper in a series introducing a
generalized Fredholm theory in a new class of smooth spaces called polyfolds.
The theory will be illustrated in upcoming papers by applications to Floer
Theory, Gromov-Witten Theory and Symplectic Field Theory.
Some proofs have been improved and a glossary added.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:40:00 GMT"
},
{
"version": "v2",
"created": "Tue, 15 Apr 2008 03:33:17 GMT"
}
] | 2008-04-15T00:00:00 | [
[
"Hofer",
"Helmut",
""
],
[
"Wysocki",
"Kris",
""
],
[
"Zehnder",
"Eduard",
""
]
] |
0705.1311 | Akihito Shirata | Akihito Shirata, Yasushi Suto, Chiaki Hikage, Tetsuya Shiromizu, Naoki
Yoshida | Galaxy clustering constraints on deviations from Newtonian gravity at
cosmological scales II: Perturbative and numerical analyses of power spectrum
and bispectrum | 12 pages, 7 figures | Phys.Rev.D76:044026,2007 | 10.1103/PhysRevD.76.044026 | null | astro-ph gr-qc hep-th | null | We explore observational constraints on possible deviations from Newtonian
gravity by means of large-scale clustering of galaxies. We measure the power
spectrum and the bispectrum of Sloan Digital Sky Survey galaxies and compare
the result with predictions in an empirical model of modified gravity. Our
model assumes an additional Yukawa-like term with two parameters that
characterize the amplitude and the length scale of the modified gravity. The
model predictions are calculated using two methods; the second-order
perturbation theory and direct N-body simulations. These methods allow us to
study non-linear evolution of large-scale structure. Using the simulation
results, we find that perturbation theory provides reliable estimates for the
power spectrum and the bispectrum in the modified Newtonian model. We also
construct mock galaxy catalogues from the simulations, and derive constraints
on the amplitude and the length scale of deviations from Newtonian gravity. The
resulting constraints from power spectrum are consistent with those obtained in
our earlier work, indicating the validity of the previous empirical modeling of
gravitational nonlinearity in the modified Newtonian model. If linear biasing
is adopted, the bispectrum of the SDSS galaxies yields constraints very similar
to those from the power spectrum. If we allow for the nonlinear biasing
instead, we find that the ratio of the quadratic to linear biasing
coefficients, b_2/b_1, should satisfy -0.4 < b_2/b_1<0.3 in the modified
Newtonian model.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:42:20 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Shirata",
"Akihito",
""
],
[
"Suto",
"Yasushi",
""
],
[
"Hikage",
"Chiaki",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"Yoshida",
"Naoki",
""
]
] |
0705.1312 | Dinesh Singh | Bahram Mashhoon, Nader Mobed, Dinesh Singh | Tidal Dynamics in Cosmological Spacetimes | 12 pages, no figures, REVTeX 4.0; appendix added, new references, and
minor changes throughout; to appear in Classical and Quantum Gravity; v4:
error in (A24) of Appendix A corrected, results and conclusions unchanged. We
thank L. Iorio for pointing out the error | Class.Quant.Grav.24:5031-5046,2007 | 10.1088/0264-9381/24/20/008 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the relative motion of nearby free test particles in cosmological
spacetimes, such as the FLRW and LTB models. In particular, the influence of
spatial inhomogeneities on local tidal accelerations is investigated. The
implications of our results for the dynamics of the solar system are briefly
discussed. That is, on the basis of the models studied in this paper, we
estimate the tidal influence of the cosmic gravitational field on the orbit of
the Earth around the Sun and show that the corresponding temporal rate of
variation of the astronomical unit is negligibly small.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:42:51 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Jun 2007 18:39:39 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Sep 2007 19:10:31 GMT"
},
{
"version": "v4",
"created": "Sat, 19 Jun 2010 19:42:57 GMT"
}
] | 2010-06-22T00:00:00 | [
[
"Mashhoon",
"Bahram",
""
],
[
"Mobed",
"Nader",
""
],
[
"Singh",
"Dinesh",
""
]
] |
0705.1313 | Sait Umar | A.S. Umar and V.E. Oberacker | Study of $^{64}$Ni+$^{132}$Sn Fusion with Density Constrained TDHF
Formalism | 8 pages, 8 figures | Phys.Rev.C76:014614,2007 | 10.1103/PhysRevC.76.014614 | null | nucl-th | null | We study fusion reactions of the $^{64}$Ni+$^{132}$Sn system using the
recently introduced density constrained time-dependent Hartree-Fock formalism.
In this formalism the fusion barriers are directly obtained from TDHF dynamics.
In addition, we incorporate the entrance channel alignment of the deformed
(oblate) $^{64}$Ni nucleus due to dynamical Coulomb excitation. We discuss the
influence of particle transfer and other dynamical effects on the fusion cross
sections. Calculated cross sections are in very good agreement with data and
other calculations.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:43:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Umar",
"A. S.",
""
],
[
"Oberacker",
"V. E.",
""
]
] |
0705.1314 | Francisco Rivadulla Fernandez | F. Rivadulla, J. Fernandez-Rossier, M. Garcia-Hernandez, M. A.
Lopez-Quintela, J. Rivas, J. B. Goodenough | VO: A Strongly Correlated Metal Close to a Mott- Hubbard Transition | Submitted to Phys. Rev. B | null | 10.1103/PhysRevB.76.205110 | null | cond-mat.str-el cond-mat.supr-con | null | Here we present experimental and computational evidences to support that
rock-salt cubic VO is a strongly correlated metal with Non-Fermi-Liquid
thermodynamics and an unusually strong spin-lattice coupling. An unexpected
change of sign of metallic thermopower with composition is tentatively ascribed
to the presence of a pseudogap in the density of states. These properties are
discussed as signatures of the proximity to a magnetic quantum phase
transition. The results are summarized in a new electronic phase diagram for
the 3d monoxides, which resembles that of other strongly correlated systems.
The structural and electronic simplicity of 3d monoxides make them ideal
candidates to progress in the understanding of highly correlated electron
systems.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 15:44:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rivadulla",
"F.",
""
],
[
"Fernandez-Rossier",
"J.",
""
],
[
"Garcia-Hernandez",
"M.",
""
],
[
"Lopez-Quintela",
"M. A.",
""
],
[
"Rivas",
"J.",
""
],
[
"Goodenough",
"J. B.",
""
]
] |
0705.1315 | Jessica Hodges | IceCube Collaboration: A. Achterberg, et al | Multi-year search for a diffuse flux of muon neutrinos with AMANDA-II | 47 pages, 13 figures. This includes the original document and an
erratum for the effective area tables | Phys.Rev.D76:042008,2007; Erratum-ibid.D77:089904,2008 | 10.1103/PhysRevD.76.042008 10.1103/PhysRevD.77.089904 | null | astro-ph | null | A search for TeV - PeV muon neutrinos from unresolved sources was performed
on AMANDA-II data collected between 2000 and 2003 with an equivalent livetime
of 807 days. This diffuse analysis sought to find an extraterrestrial neutrino
flux from sources with non-thermal components. The signal is expected to have a
harder spectrum than the atmospheric muon and neutrino backgrounds. Since no
excess of events was seen in the data over the expected background, an upper
limit of E^{2}\Phi_{90% C.L.} < 7.4 x 10^{-8} GeV cm^{-2} s^{-1} sr^{-1} is
placed on the diffuse flux of muon neutrinos with a \Phi \propto E^{-2}
spectrum in the energy range 16 TeV to 2.5 PeV. This is currently the most
sensitive \Phi \propto E^{-2} diffuse astrophysical neutrino limit. We also set
upper limits for astrophysical and prompt neutrino models, all of which have
spectra different than \Phi \propto E^{-2}.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:56:39 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jul 2007 15:23:13 GMT"
},
{
"version": "v3",
"created": "Sun, 13 Apr 2008 17:02:26 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"IceCube Collaboration",
"",
""
],
[
"Achterberg",
"A.",
""
]
] |
0705.1316 | Dietrich Burde | Dietrich Burde, Karel Dekimpe, Kim Vercammen | Novikov algebras and Novikov structures on Lie algebras | null | null | null | null | math.RA | null | We study ideals of Novikov algebras and Novikov structures on
finite-dimensional Lie algebras. We present the first example of a three-step
nilpotent Lie algebra which does not admit a Novikov structure. On the other
hand we show that any free three-step nilpotent Lie algebra admits a Novikov
structure. We study the existence question also for Lie algebras of triangular
matrices. Finally we show that there are families of Lie algebras of arbitrary
high solvability class which admit Novikov structures.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:01:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Burde",
"Dietrich",
""
],
[
"Dekimpe",
"Karel",
""
],
[
"Vercammen",
"Kim",
""
]
] |
0705.1317 | Yukio Tomozawa | Yukio Tomozawa | Cosmic microwave background dipole, peculiar velocity and Hubble flow | 9 pages, no figures | null | null | null | astro-ph | null | Two types of cosmology are discussed and their implications for the observed
cmb (cosmic microwave background radiation) dipole are described. Theorems
useful for understanding the cause for a cmb dipole are presented. Since the
present peculiar velocity of the solar system relative to the GA (Great
Attracter) cannot explain the observed cmb dipole, the author presents the
possibility of Hubble flow of the GA as a cause in one case and a further
peculiar velocity of the GA in the other case.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:03:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Tomozawa",
"Yukio",
""
]
] |
0705.1318 | A. B. Balantekin | A.B. Balantekin (Wisconsin U., Madison) and Y. Pehlivan (Wisconsin U.,
Madison) | Supersymmetry and Nuclear Pairing | 4 pages of REVTEX, one figure | J.Phys.G34:1783-1788,2007 | 10.1088/0954-3899/34/7/016 | null | nucl-th | null | We show that nuclear pairing Hamiltonian exhibits supersymmetry in the
strong-coupling limit. The underlying supersymmetric quantum mechanical
structure explains the degeneracies between the energies of the N and Nmax-N+1
pair eigenstates. The supersymmetry transformations connecting these states are
given.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:05:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Balantekin",
"A. B.",
"",
"Wisconsin U., Madison"
],
[
"Pehlivan",
"Y.",
"",
"Wisconsin U.,\n Madison"
]
] |
0705.1319 | Mar\'ia Jes\'us Mart\'inez Gonz\'alez | M. J. Martinez Gonzalez, M. Collados, B. Ruiz Cobo, S. K. Solanki | Low-lying magnetic loops in the solar internetwork | Accepted for publication in A&A letters | null | 10.1051/0004-6361:20077505 | null | astro-ph | null | The aim of this work is to study the structure of the magnetic field vector
in the internetwork and search for the presence of small-scale loops. We invert
1.56 micron spectropolarimetric observations of internetwork regions at disc
centre by applying the SIR code. This allows us to recover the atmospheric
parameters that play a role in the formation of these spectral lines. We are
mainly interested in the structure of the magnetic field vector. We find that
many opposite polarity elements of the internetwork are connected by short
(2-6''), low-lying (photospheric) loops. These loops connect at least the 10-20
% of the internetwork flux visible in our data. Also we have some evidence that
points towards a dynamic scenario which can be produced by the emergence of
internetwork magnetic flux.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:05:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gonzalez",
"M. J. Martinez",
""
],
[
"Collados",
"M.",
""
],
[
"Cobo",
"B. Ruiz",
""
],
[
"Solanki",
"S. K.",
""
]
] |
0705.1320 | O. Stenull | Hans-Karl Janssen, Sven Lubeck, Olaf Stenull | Finite-size scaling of directed percolation in the steady state | 21 pages, 6 figures | Phys. Rev. E 76, 041126 (2007) | 10.1103/PhysRevE.76.041126 | null | cond-mat.stat-mech | null | Recently, considerable progress has been made in understanding finite-size
scaling in equilibrium systems. Here, we study finite-size scaling in
non-equilibrium systems at the instance of directed percolation (DP), which has
become the paradigm of non-equilibrium phase transitions into absorbing states,
above, at and below the upper critical dimension. We investigate the
finite-size scaling behavior of DP analytically and numerically by considering
its steady state generated by a homogeneous constant external source on a
d-dimensional hypercube of finite edge length L with periodic boundary
conditions near the bulk critical point. In particular, we study the order
parameter and its higher moments using renormalized field theory. We derive
finite-size scaling forms of the moments in a one-loop calculation. Moreover,
we introduce and calculate a ratio of the order parameter moments that plays a
similar role in the analysis of finite size scaling in absorbing nonequilibrium
processes as the famous Binder cumulant in equilibrium systems and that, in
particular, provides a new signature of the DP universality class. To
complement our analytical work, we perform Monte Carlo simulations which
confirm our analytical results.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:36:25 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Oct 2007 13:01:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Janssen",
"Hans-Karl",
""
],
[
"Lubeck",
"Sven",
""
],
[
"Stenull",
"Olaf",
""
]
] |
0705.1321 | Hugh R. Morton | H. R. Morton | Mutant knots with symmetry | 15 pages | Mathematical Proceedings of the Cambridge Philosophical Society
146 (2009), 95-107 | 10.1017/S0305004108001862 | null | math.GT | null | Mutant knots, in the sense of Conway, are known to share the same Homfly
polynomial. Their 2-string satellites also share the same Homfly polynomial,
but in general their m-string satellites can have different Homfly polynomials
for m>2. We show that, under conditions of extra symmetry on the constituent
2-tangles, the directed m-string satellites of mutants share the same Homfly
polynomial for m<6 in general, and for all choices of m when the satellite is
based on a cable knot pattern.
We give examples of mutants with extra symmetry whose Homfly polynomials of
some 6-string satellites are different, by comparing their quantum sl(3)
invariants.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:17:40 GMT"
}
] | 2009-03-31T00:00:00 | [
[
"Morton",
"H. R.",
""
]
] |
0705.1322 | E. Ragoucy | M. Mintchev and E. Ragoucy | Algebraic approach to multiple defects on the line and application to
Casimir force | 24 pages, 10 figures | J.Phys.A40:9515,2007 | 10.1088/1751-8113/40/31/025 | LAPTH-1177/07 | hep-th cond-mat.other math-ph math.MP | null | An algebraic framework for quantization in presence of arbitrary number of
point-like defects on the line is developed. We consider a scalar field which
interacts with the defects and freely propagates away of them. As an
application we compute the Casimir force both at zero and finite temperature.
We derive also the charge density in the Gibbs state of a complex scalar field
with defects. The example of two delta-defects is treated in detail.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:40:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mintchev",
"M.",
""
],
[
"Ragoucy",
"E.",
""
]
] |
0705.1323 | Konstantin V. Getman | Konstantin Getman (1), Eric Feigelson (1), Warrick Lawson (2), Patrick
Broos (1), Gordon Garmire (1) ((1) PSU, (2) UNSW/ADFA) | The Stellar Population And Origin Of The Mysterious High-Latitude Star
Forming Cloud CG 12 | 58 pages, 12 figures, 5 tables, submitted to ApJ 05/08/07 | null | 10.1086/524004 | null | astro-ph | null | The mysterious high galactic latitude cometary globule CG12 has been observed
with the ACIS detector on board the Chandra X-ray Observatory. We detect 128
X-ray sources; half are likely young stars formed within the globule's head.
This new population of >50 T-Tauri stars and one new embedded protostar is far
larger than the previously reported few intermediate-mass and two protostellar
members of the cloud. Most of the newly discovered stars have masses 0.2-0.7Mo,
and 9-15% have K-band excesses from inner protoplanetary disks. X-ray
properties provide an independent distance estimate consistent with CG12's
unusual location >200pc above the Galactic plane. The star formation efficiency
in CG12 appears to be 15-35%, far above that seen in other triggered molecular
globules. The median photometric age found for the T-Tauri population is ~4Myr
with a large spread of <1-20Myr and ongoing star formation in the molecular
cores. The stellar age and spatial distributions are inconsistent with a simple
radiation driven implosion (RDI) model, and suggest either that CG12 is an
atypically large shocked globule, or it has been subject to several distinct
episodes of triggering and ablation. We report a previously unnoticed group of
B-type stars northwest of CG12 which may be the remnants of an OB association
which produced multiple supernova explosions that could have shocked and
ablated the cloud over a 15-30Myr period. HD120958 (B3e), the most luminous
member of the group, may be currently driving an RDI shock into the CG12 cloud.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:43:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Getman",
"Konstantin",
"",
"PSU"
],
[
"Feigelson",
"Eric",
"",
"PSU"
],
[
"Lawson",
"Warrick",
"",
"UNSW/ADFA"
],
[
"Broos",
"Patrick",
"",
"PSU"
],
[
"Garmire",
"Gordon",
"",
"PSU"
]
] |
0705.1324 | Ricardo Carretero | H.E. Nistazakis, D.J. Frantzeskakis, P.G. Kevrekidis, B.A. Malomed, R.
Carretero-Gonzalez | Bright-Dark Soliton Complexes in Spinor Bose-Einstein Condensates | 10 pages, 4 figures. Submitted to PRA, May 2007 | Phys. Rev. A 77 (2007) 033612 | 10.1103/PhysRevA.77.033612 | null | cond-mat.other | null | We present bright-dark vector solitons in quasi-one-dimensional spinor (F=1)
Bose-Einstein condensates. Using a multiscale expansion technique, we reduce
the corresponding nonintegrable system of three coupled Gross-Pitaevskii
equations (GPEs) to a completely integrable Yajima-Oikawa system. In this way,
we obtain approximate solutions for small-amplitude vector solitons of
dark-dark-bright and bright-bright-dark types, in terms of the $m_{F}=+1,-1,0$
spinor components, respectively. By means of numerical simulations of the full
GPE system, we demonstrate that these states indeed feature soliton properties,
i.e., they propagate undistorted and undergo quasi-elastic collisions. It is
also shown that, in the presence of a parabolic trap of strength $\omega $, the
bright component(s) is (are) guided by the dark one(s), and, as a result, the
small-amplitude vector soliton as a whole performs harmonic oscillations of
frequency $\omega/ \sqrt{2}$ in the shallow soliton limit. We investigate
numerically deviations from this prediction, as the depth of the solitons is
increased, as well as when the strength of the spin-dependent interaction is
modified.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:50:50 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Sep 2007 17:39:25 GMT"
}
] | 2010-12-10T00:00:00 | [
[
"Nistazakis",
"H. E.",
""
],
[
"Frantzeskakis",
"D. J.",
""
],
[
"Kevrekidis",
"P. G.",
""
],
[
"Malomed",
"B. A.",
""
],
[
"Carretero-Gonzalez",
"R.",
""
]
] |
0705.1325 | Alice C. Quillen | Alice C. Quillen (Rochester), Alessandro Morbidelli (Nice), Alex Moore
(Rochester) | Planetary embryos and planetesimals residing in thin debris disks | submitted to MNRAS | 2007, MNRAS, 380, 1642 | 10.1111/j.1365-2966.2007.12217.x | null | astro-ph | null | We consider constraints on the planetesimal population residing in the disks
of AU Microscopii, Beta Pictoris and Fomalhaut taking into account their
observed thicknesses and normal disk opacities. We estimate that bodies of
radius 5, 180 and 70 km are responsible for initiating the collisional cascade
accounting for the dust production for AU-Mic, Beta-Pic and Fomalhaut's disks,
respectively, at break radii from the star where their surface brightness
profiles change slope. Larger bodies, of radius 1000km and with surface density
of order 0.01 g/cm^2, are required to explain the thickness of these disks
assuming that they are heated by gravitational stirring. A comparison between
the densities of the two sizes suggests the size distribution in the largest
bodies is flatter than that observed in the Kuiper belt. AU Mic's disk requires
the shallowest size distribution for bodies with radius greater than 10km
suggesting that the disk contains planetary embryos experiencing a stage of
runaway growth.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 16:50:17 GMT"
}
] | 2015-07-29T00:00:00 | [
[
"Quillen",
"Alice C.",
"",
"Rochester"
],
[
"Morbidelli",
"Alessandro",
"",
"Nice"
],
[
"Moore",
"Alex",
"",
"Rochester"
]
] |
0705.1326 | Alan Cornell | T. M. Aliev, A. S. Cornell and Naveen Gaur | Lepton Flavour Violation in Unparticle Physics | 7 pages, 3 figures; typographical errors corrected and references
added in version 2 | Phys.Lett.B657:77-80,2007 | 10.1016/j.physletb.2007.09.055 | null | hep-ph | null | Recently H. Georgi has introduced an unparticle $\unpart$ in order to
describe the low energy physics of a nontrivial scale invariant sector of an
effective theory. In this work we have explored the phenomenology of an
unparticle using the lepton flavour violating decay $\mu^{-}\to e^{-} e^{+}
e^{-}$, and found that the branching ratio of this decay is strongly dependent
on the scaling dimension.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:06:51 GMT"
},
{
"version": "v2",
"created": "Mon, 14 May 2007 13:24:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aliev",
"T. M.",
""
],
[
"Cornell",
"A. S.",
""
],
[
"Gaur",
"Naveen",
""
]
] |
0705.1327 | Jose Gonzalez | J. Gonzalez and E. Perfetto | Cooper-pair propagation and superconducting correlations in graphene | 5 pages, 2 figures; corrected discussion | Phys. Rev. B 76, 155404 (2007) | 10.1103/PhysRevB.76.155404 | null | cond-mat.mes-hall cond-mat.supr-con | null | We investigate the Cooper-pair propagation and the proximity effect in
graphene under conditions in which the distance L between superconducting
electrodes is much larger than the width W of the contacts. In the case of
undoped graphene, supercurrents may exist with a spatial decay proportional to
W^2/L^3. This changes upon doping into a 1/L^2 behavior, opening the
possibility to observe a supercurrent over length scales above 1 micron at
suitable doping levels. We also show that there is in general a crossover
temperature T ~ v_F/k_B L that marks the onset of the strong decay of the
supercurrent, and that corresponds to the scale below which the Cooper pairs
are not disrupted by thermal effects during their propagation.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:09:23 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 16:49:52 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gonzalez",
"J.",
""
],
[
"Perfetto",
"E.",
""
]
] |
0705.1328 | Juan Jose Palacios | J. J. Palacios, P. Tarakeshwar, Dae M. Kim | Metal contacts in carbon nanotube field effect transistors: Beyond the
Schottky barrier paradigm | Submitted to PRL | null | 10.1103/PhysRevB.77.113403 | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | The observed performances of carbon nanotube field effect transistors are
examined using first-principles quantum transport calculations. We focus on the
nature and role of the electrical contact of Au and Pd electrodes to open-ended
semiconducting nanotubes, allowing the chemical contact at the surface to fully
develop through large-scale relaxation of the contacting atomic configuration.
We present the first direct numerical evidence of Pd contacts exhibiting
perfect transparency for hole injection as opposed to that of Au contacts.
Their respective Schottky barrier heights, on the other hand, turn out to be
fairly similar for realistic contact models. These findings are in general
agreement with experimental data reported to date, and show that a Schottky
contact is not merely a passive ohmic contact but actively influences the
device I-V behavior.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:09:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Palacios",
"J. J.",
""
],
[
"Tarakeshwar",
"P.",
""
],
[
"Kim",
"Dae M.",
""
]
] |
0705.1329 | Richard J. Mathar | Richard J. Mathar | Third Order Newton's Method for Zernike Polynomial Zeros | Improved eqs (1),(3) and (48). More references. Expanded Table in
Appendix | null | null | null | math.NA | null | The Zernike radial polynomials are a system of orthogonal polynomials over
the unit interval with weight x. They are used as basis functions in optics to
expand fields over the cross section of circular pupils. To calculate the roots
of Zernike polynomials, we optimize the generic iterative numerical Newton's
Method that iterates on zeros of functions with third order convergence. The
technique is based on rewriting the polynomials as Gauss hypergeometric
functions, reduction of second order derivatives to first order derivatives,
and evaluation of some ratios of derivatives by terminating continued
fractions.
A PARI program and a short table of zeros complete up to polynomials of 20th
order are included.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:22:15 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Jun 2007 10:36:42 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Mathar",
"Richard J.",
""
]
] |
0705.1330 | Pedro David Ruiz-Femenia | Pedro D. Ruiz-Femenia | The soft-energy region in the radiative decay of bound states | 28 pages, 5 figures; typos corrected, one reference added, published
version | Nucl.Phys.B788:21-46,2008 | 10.1016/j.nuclphysb.2007.07.013 | MPP-2007-46 | hep-ph | null | The orthopositronium decay to three photons is studied in the phase-space
region where one of the photons has an energy comparable to the relative
three-momentum of the e+e- system (w ~ m alpha). The NRQED computation in this
regime shows that the dominant contribution arises from distances ~
1/(mw)^(1/2), which allows to treat the Coulomb interaction perturbatively. The
small-photon energy expansion of the 1-loop decay spectrum from full QED yields
the same result as the effective theory. By doing the threshold expansion of
the 1-loop QED amplitude we confirm that the leading term arises from a
loop-momentum region where q^0 ~ q^2/m ~ w. This corresponds to a new
non-relativistic loop-momentum region, which has to be taken into account for
the description of a non-relativistic particle-antiparticle system that decays
through soft photon emission.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 19:10:53 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 17:01:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ruiz-Femenia",
"Pedro D.",
""
]
] |
0705.1331 | Curtis J. Saxton | Curtis J. Saxton (1), Kinwah Wu (1,2), Joao. B. G. Canalle (3), Mark
Cropper (1) and Gavin Ramsay (1,4) ((1) Mullard Space Science Lab, University
College London, (2) Department of Physics, National Tsing Hua University, (3)
State University of Rio de Janeiro, (4) Armagh Observatory) | X-ray emissions from two-temperature accretion flows within a dipole
magnetic funnel | MNRAS accepted; 13 pages, 10 figures, 2 tables | Mon.Not.Roy.Astron.Soc.379:779-790,2007 | 10.1111/j.1365-2966.2007.11958.x | null | astro-ph | null | We investigate the hydrodynamics of accretion channelled by a dipolar
magnetic field (funnel flows). We consider situations in which the electrons
and ions in the flow cannot maintain thermal equilibrium (two-temperature
effects) due to strong radiative loss, and determine the effects on the keV
X-ray properties of the systems. We apply this model to investigate the
accretion shocks of white dwarfs in magnetic cataclysmic variables. We have
found that the incorporation of two-temperature effects could harden the keV
X-rays. Also, the dipolar model yields harder X-ray spectra than the standard
planar model if white dwarf is sufficiently massive (>~1M_sun). When fitting
observed keV X-ray spectra of magnetic cataclysmic variables, the inclusion of
two-temperature hydrodynamics and a dipolar accretion geometry lowers estimates
for white-dwarf masses when compared with masses inferred from models excluding
these effects. We find mass reductions <~9% in the most massive cases.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:29:22 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Saxton",
"Curtis J.",
""
],
[
"Wu",
"Kinwah",
""
],
[
"Canalle",
"Joao. B. G.",
""
],
[
"Cropper",
"Mark",
""
],
[
"Ramsay",
"Gavin",
""
]
] |
0705.1332 | Xiangjun Feng | Xiangjun Feng | The Constraints Determining Forms of Entropy and Inducing Equilibrium
Distributions | 9 pages, 0 figures | WCFSGS, Vol. 3, No. 5, May, 2007, 300-P-2007-05-01, ISSN:1936-7260 | null | 300-P-2007-05-01 | cond-mat.stat-mech | null | The ideas of the constraint-based statistics are introduced. The axiom and
six theorems of the constraint-based statistics are established.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:29:46 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 09:53:57 GMT"
},
{
"version": "v3",
"created": "Fri, 11 May 2007 09:11:34 GMT"
},
{
"version": "v4",
"created": "Mon, 14 May 2007 11:30:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Feng",
"Xiangjun",
""
]
] |
0705.1333 | Brian Wissman | Brian D. Wissman | Global Solutions to the Ultra-Relativistic Euler Equations | null | null | null | null | math.AP | null | We prove a global existence theorem for the $3\times 3$ system of
relativistic Euler equations in one spacial dimension. It is shown that in the
ultra-relativistic limit, there is a family of equations of state that satisfy
the second law of thermodynamics for which solutions exist globally. With this
limit and equation of state, which includes equations of state for both an
ideal gas and one dominated by radiation, the relativistic Euler equations can
be analyzed by a Nishida-type method leading to a large data existence theorem,
including the entropy and particle number evolution, using a Glimm scheme. Our
analysis uses the fact that the equations of state are of the form $p=p(n,S)$,
but whose form simplifies to $p=a^{2}\rho$ when viewed as a function of $\rho$
alone.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:40:13 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Wissman",
"Brian D.",
""
]
] |
0705.1334 | Yutaka Sakamura | Yutaka Sakamura | Effective theories of gauge-Higgs unification models in warped spacetime | 36 pages, 1 figure | Phys.Rev.D76:065002,2007 | 10.1103/PhysRevD.76.065002 | OU-HET 581/2007 | hep-ph hep-th | null | We derive four-dimensional (4D) effective theories of the gauge-Higgs
unification models in the warped spacetime. The effective action can be
expressed in a simple form by neglecting subleading corrections to the wave
functions. We have shown in our previous works that some Higgs couplings to the
other fields are suppressed by factors that depend on $\bar{\theta}_H$ from the
values in the standard model. Here $\bar{\theta}_H$ is the Wilson line phase
along the fifth dimension, which characterizes the electroweak symmetry
breaking. The effective action derived here explicitly shows a nonlinear
structure of the Higgs sector, which clarifies the origins of those suppression
factors.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:43:15 GMT"
},
{
"version": "v2",
"created": "Fri, 18 May 2007 13:57:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sakamura",
"Yutaka",
""
]
] |
0705.1335 | Kasso Okoudjou | Ilya A. Krishtal, Kasso A. Okoudjou | Invertibility of the Gabor frame operator on the Wiener amalgam space | null | null | null | null | math.FA math.CA | null | We use a generalization of Wiener's $1/f$ theorem to prove that for a Gabor
frame with the generator in the Wiener amalgam space $W(L^{\infty},
\ell^{1}_{\nu})(\mathbb{R}^{d})$, the corresponding frame operator is
invertible on this space. Therefore, for such a Gabor frame, the generator of
the canonical dual belongs also to $W(L^{\infty},
\ell^{1}_{\nu})(\mathbb{R}^{d}) $
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:43:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Krishtal",
"Ilya A.",
""
],
[
"Okoudjou",
"Kasso A.",
""
]
] |
0705.1336 | Sergey Loyka | Sergey Loyka, George Levin | Diversity-Multiplexing Tradeoff via Asymptotic Analysis of Large MIMO
Systems | To appear in 2007 IEEE International Symposium on Information Theory
(ISIT 2007), Nice, June 2007 | null | 10.1109/ISIT.2007.4557189 | null | cs.IT math.IT | null | Diversity-multiplexing tradeoff (DMT) presents a compact framework to compare
various MIMO systems and channels in terms of the two main advantages they
provide (i.e. high data rate and/or low error rate). This tradeoff was
characterized asymptotically (SNR-> infinity) for i.i.d. Rayleigh fading
channel by Zheng and Tse [1]. The asymptotic DMT overestimates the finite-SNR
one [2]. In this paper, using the recent results on the asymptotic (in the
number of antennas) outage capacity distribution, we derive and analyze the
finite-SNR DMT for a broad class of channels (not necessarily Rayleigh fading).
Based on this, we give the convergence conditions for the asymptotic DMT to be
approached by the finite-SNR one. The multiplexing gain definition is shown to
affect critically the convergence point: when the multiplexing gain is defined
via the mean (ergodic) capacity, the convergence takes place at realistic SNR
values. Furthermore, in this case the diversity gain can also be used to
estimate the outage probability with reasonable accuracy. The multiplexing gain
definition via the high-SNR asymptote of the mean capacity (as in [1]) results
in very slow convergence for moderate to large systems (as 1/ln(SNR)^2) and,
hence, the asymptotic DMT cannot be used at realistic SNR values. For this
definition, the high-SNR threshold increases exponentially in the number of
antennas and in the multiplexing gain. For correlated keyhole channel, the
diversity gain is shown to decrease with correlation and power imbalance of the
channel. While the SNR-asymptotic DMT of Zheng and Tse does not capture this
effect, the size-asymptotic DMT does.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:49:54 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Loyka",
"Sergey",
""
],
[
"Levin",
"George",
""
]
] |
0705.1337 | David A. Brown | D.A. Brown, R. Soltz, J. Newby, A. Kisiel | Exploring Lifetime Effects in Femtoscopy | 5 pages, 2 figures | Phys.Rev.C76:044906,2007 | 10.1103/PhysRevC.76.044906 | UCRL-JRNL-215137 | nucl-th | null | We investigate the role of lifetime effects from resonances and emission
duration tails in femtoscopy at RHIC in two Blast-Wave models. We find the
non-Gaussian components compare well with published source imaged data, but the
value of R_out obtained from Gaussian fits is not insensitive to the
non-Gaussian contributions when realistic acceptance cuts are applied to
models.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:54:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Brown",
"D. A.",
""
],
[
"Soltz",
"R.",
""
],
[
"Newby",
"J.",
""
],
[
"Kisiel",
"A.",
""
]
] |
0705.1338 | Francisco A. Brito | F.A. Brito, J.R. Nascimento, E. Passos, and A. Petrov | Lorentz-CPT violation, radiative corrections and finite temperature | To appear in JHEP, 10 pages, 1 eps figure, minor changes and
references added | JHEP 0706:016,2007 | 10.1088/1126-6708/2007/06/016 | null | hep-th | null | In this work we investigate the radiatively induced Chern-Simons-like terms
in four-dimensions at zero and finite temperature. We use the approach of
rationalizing the fermion propagator up to the leading order in the
CPT-violating coupling $b_\mu$. In this approach, we have shown that although
the coefficient of Chern-Simons term can be found unambiguously in different
regularization schemes at zero or finite temperature, it remains undetermined.
We observe a correspondence among results obtained at finite and zero
temperature.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 18:00:26 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 18:50:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brito",
"F. A.",
""
],
[
"Nascimento",
"J. R.",
""
],
[
"Passos",
"E.",
""
],
[
"Petrov",
"A.",
""
]
] |
0705.1339 | Mary Erlund | M.C. Erlund, A.C. Fabian, Katherine M. Blundell, C. Moss, and D.R.
Ballantyne | The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton
emission? | 9 pages, 9 figures, definitive version published by MNRAS | Mon.Not.Roy.Astron.Soc.379:498-506,2007 | 10.1111/j.1365-2966.2007.11962.x | null | astro-ph | null | We report the discovery of an X-ray counterpart to the southern radio hotspot
of the largest-known radio quasar 4C 74.26 (whose redshift is z=0.104). Both
XMM-Newton and Chandra images reveal the same significant (10arcsec, i.e.
19kpc) offset between the X-ray hotspot and the radio hotspot imaged with
MERLIN. The peak of the X-ray emission may be due to synchrotron or
inverse-Compton emission. If synchrotron emission, the hotspot represents the
site of particle acceleration and the offset arises from either the jet
exhibiting Scheuer's `dentist's drill' effect or a fast spine having less
momentum than the sheath surrounding it, which creates the radio hotspot. If
the emission arises from the inverse-Compton process, it must be
inverse-Compton scattering of the CMB in a decelerating relativistic flow,
implying that the jet is relativistic (Gamma >= 2) out to a distance of at
least 800kpc. Our analysis, including optical data from the Liverpool
Telescope, rules out a background AGN for the X-ray emission and confirms its
nature as a hotspot, making it the most X-ray luminous hotspot yet detected.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 18:18:48 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Jul 2007 17:14:12 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Erlund",
"M. C.",
""
],
[
"Fabian",
"A. C.",
""
],
[
"Blundell",
"Katherine M.",
""
],
[
"Moss",
"C.",
""
],
[
"Ballantyne",
"D. R.",
""
]
] |
0705.1340 | Sergey Loyka | Victoria Kostina, Sergey Loyka | On Optimum Power Allocation for the V-BLAST | Accepted by IEEE Transactions on Communications, Apr. 2007 | null | 10.1109/TCOMM.2008.060517 | null | cs.IT math.IT | null | A unified analytical framework for optimum power allocation in the unordered
V-BLAST algorithm and its comparative performance analysis are presented.
Compact closed-form approximations for the optimum power allocation are
derived, based on average total and block error rates. The choice of the
criterion has little impact on the power allocation and, overall, the optimum
strategy is to allocate more power to lower step transmitters and less to
higher ones. High-SNR approximations for optimized average block and total
error rates are given. The SNR gain of optimization is rigorously defined and
studied using analytical tools, including lower and upper bounds, high and low
SNR approximations. The gain is upper bounded by the number of transmitters,
for any modulation format and type of fading channel. While the average
optimization is less complex than the instantaneous one, its performance is
almost as good at high SNR. A measure of robustness of the optimized algorithm
is introduced and evaluated. The optimized algorithm is shown to be robust to
perturbations in individual and total transmit powers. Based on the algorithm
robustness, a pre-set power allocation is suggested as a low-complexity
alternative to the other optimization strategies, which exhibits only a minor
loss in performance over the practical SNR range.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 18:05:44 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Kostina",
"Victoria",
""
],
[
"Loyka",
"Sergey",
""
]
] |
0705.1341 | Lincoln D. Carr | Joachim Brand, L. D. Carr, and B. P. Anderson | Experiments on Multidimensional Solitons | review paper, to appear as Chapter 5b in "Emergent Nonlinear
Phenomena in Bose-Einstein Condensates: Theory and Experiment," edited by P.
G. Kevrekidis, D. J. Frantzeskakis, and R. Carretero-Gonzalez
(Springer-Verlag) | Chapter 8 in "Emergent Nonlinear Phenomena in Bose-Einstein
Condensates: Theory and Experiment," edited by P. G. Kevrekidis, D. J.
Frantzeskakis, and R. Carretero-Gonzalez (Springer-Verlag, Berlin, 2009) | 10.1007/978-3-540-73591-5_8 | null | cond-mat.other cond-mat.mes-hall nlin.PS | null | This article presents an overview of experimental efforts in recent years
related to multidimensional solitons in Bose-Einstein condensates. We discuss
the techniques used to generate and observe multidimensional nonlinear waves in
Bose-Einstein condensates with repulsive interactions. We further summarize
observations of planar soliton fronts undergoing the snake instability, the
formation of vortex rings, and the emergence of hybrid structures.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 17:58:14 GMT"
}
] | 2010-06-01T00:00:00 | [
[
"Brand",
"Joachim",
""
],
[
"Carr",
"L. D.",
""
],
[
"Anderson",
"B. P.",
""
]
] |
0705.1342 | Elizabeth Meckes | Elizabeth Meckes | On the approximate normality of eigenfunctions of the Laplacian | 21 pages | Trans. Amer. Math. Soc. 361, no. 10 (2009) | null | null | math.SP math.PR | null | The main result of this paper is a bound on the distance between the
distribution of an eigenfunction of the Laplacian on a compact Riemannian
manifold and the Gaussian distribution. If $X$ is a random point on a manifold
$M$ and $f$ is an eigenfunction of the Laplacian with $L^2$-norm one and
eigenvalue $-\mu$, then $$d_{TV}(f(X),Z)\le\frac{2}{\mu}\E\big|\|\nabla
f(X)\|^2-\E\|\nabla f(X) \|^2\big|.$$ This result is applied to construct
specific examples of spherical harmonics of arbitrary (odd) degree which are
close to Gaussian in distribution. A second application is given to random
linear combinations of eigenfunctions on flat tori.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 19:11:55 GMT"
}
] | 2010-05-18T00:00:00 | [
[
"Meckes",
"Elizabeth",
""
]
] |
0705.1343 | Damien Chablat | Damien Chablat (IRCCyN), Philippe Wenger (IRCCyN), F\'elix Majou
(IRCCyN) | The Optimal Design of Three Degree-of-Freedom Parallel Mechanisms for
Machining Applications | null | The 11Th International Conference on Advanced Robotics (2003) 1-6 | null | null | cs.RO | null | The subject of this paper is the optimal design of a parallel mechanism
intended for three-axis machining applications. Parallel mechanisms are
interesting alternative designs in this context but most of them are designed
for three- or six-axis machining applications. In the last case, the position
and the orientation of the tool are coupled and the shape of the workspace is
complex. The aim of this paper is to use a simple parallel mechanism with
two-degree-of-freedom (dof) for translational motions and to add one leg to
have one-dof rotational motion. The kinematics and singular configurations are
studied as well as an optimization method. The three-degree-of-freedom
mechanisms analyzed in this paper can be extended to four-axis machines by
adding a fourth axis in series with the first two.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 19:13:46 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chablat",
"Damien",
"",
"IRCCyN"
],
[
"Wenger",
"Philippe",
"",
"IRCCyN"
],
[
"Majou",
"Félix",
"",
"IRCCyN"
]
] |
0705.1344 | Damien Chablat | Maher Baili (IRCCyN), Philippe Wenger (IRCCyN), Damien Chablat
(IRCCyN) | Classification of one family of 3R positioning Manipulators | null | The 11Th International Conference on Advanced Robotics (2003) 1-6 | null | null | cs.RO | null | The aim of this paper is to classify one family of 3R serial positioning
manipulators. This categorization is based on the number of cusp points of
quaternary, binary, generic and non-generic manipulators. It was found three
subsets of manipulators with 0, 2 or 4 cusp points and one homotopy class for
generic quaternary manipulators. This classification allows us to define the
design parameters for which the manipulator is cuspidal or not, i.e., for which
the manipulator can or cannot change posture without meeting a singularity,
respectively.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 19:16:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Baili",
"Maher",
"",
"IRCCyN"
],
[
"Wenger",
"Philippe",
"",
"IRCCyN"
],
[
"Chablat",
"Damien",
"",
"IRCCyN"
]
] |
0705.1345 | Vishwambhar Rathi | Kapil Bhattad, Vishwambhar Rathi, Ruediger Urbanke | Degree Optimization and Stability Condition for the Min-Sum Decoder | submitted to ITW 07 | null | null | null | cs.IT math.IT | null | The min-sum (MS) algorithm is arguably the second most fundamental algorithm
in the realm of message passing due to its optimality (for a tree code) with
respect to the {\em block error} probability \cite{Wiberg}. There also seems to
be a fundamental relationship of MS decoding with the linear programming
decoder \cite{Koetter}. Despite its importance, its fundamental properties have
not nearly been studied as well as those of the sum-product (also known as BP)
algorithm.
We address two questions related to the MS rule. First, we characterize the
stability condition under MS decoding. It turns out to be essentially the same
condition as under BP decoding. Second, we perform a degree distribution
optimization. Contrary to the case of BP decoding, under MS decoding the
thresholds of the best degree distributions for standard irregular LDPC
ensembles are significantly bounded away from the Shannon threshold. More
precisely, on the AWGN channel, for the best codes that we find, the gap to
capacity is 1dB for a rate 0.3 code and it is 0.4dB when the rate is 0.9 (the
gap decreases monotonically as we increase the rate).
We also used the optimization procedure to design codes for modified MS
algorithm where the output of the check node is scaled by a constant
$1/\alpha$. For $\alpha = 1.25$, we observed that the gap to capacity was
lesser for the modified MS algorithm when compared with the MS algorithm.
However, it was still quite large, varying from 0.75 dB to 0.2 dB for rates
between 0.3 and 0.9.
We conclude by posing what we consider to be the most important open
questions related to the MS algorithm.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 19:19:26 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Bhattad",
"Kapil",
""
],
[
"Rathi",
"Vishwambhar",
""
],
[
"Urbanke",
"Ruediger",
""
]
] |
0705.1346 | Alexey Toporensky | A. Toporensky, P. Tretyakov | Power-law anisotropic cosmological solution in 5+1 dimensional
Gauss-Bonnet gravity | 10 pages, one statement corrected, references added | Grav.Cosmol.13:207-210,2007 | null | null | gr-qc | null | We write down an anisotropic solution for a flat 5+1 dimensional Universe in
Gauss-Bonnet gravity. In the model under investigation this solution replaces
the generalized Kasner solution near a cosmological singularity.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 19:21:52 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 19:34:23 GMT"
},
{
"version": "v3",
"created": "Fri, 3 Aug 2007 17:39:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Toporensky",
"A.",
""
],
[
"Tretyakov",
"P.",
""
]
] |
0705.1347 | Alexander E. Holroyd | Janko Gravner and Alexander E. Holroyd | Slow Convergence in Bootstrap Percolation | 22 pages, 3 figures | null | null | null | math.PR math-ph math.MP | null | In the bootstrap percolation model, sites in an L by L square are initially
infected independently with probability p. At subsequent steps, a healthy site
becomes infected if it has at least 2 infected neighbours. As
(L,p)->(infinity,0), the probability that the entire square is eventually
infected is known to undergo a phase transition in the parameter p log L,
occurring asymptotically at lambda = pi^2/18. We prove that the discrepancy
between the critical parameter and its limit lambda is at least Omega((log
L)^(-1/2)). In contrast, the critical window has width only Theta((log
L)^(-1)). For the so-called modified model, we prove rigorous explicit bounds
which imply for example that the relative discrepancy is at least 1% even when
L = 10^3000. Our results shed some light on the observed differences between
simulations and rigorous asymptotics.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 19:36:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Gravner",
"Janko",
""
],
[
"Holroyd",
"Alexander E.",
""
]
] |
0705.1348 | James S. Milne | J.S. Milne | Semisimple Algebraic Groups in Characteristic Zero | null | null | null | null | math.RT math.AG | null | It is shown that the classification theorems for semisimple algebraic groups
in characteristic zero can be derived quite simply and naturally from the
corresponding theorems for Lie algebras by using a little of the theory of
tensor categories. This article is extracted from Milne 2007.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 19:38:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Milne",
"J. S.",
""
]
] |
0705.1349 | Yurij Kalyuzhnyi V | Y.V.Kalyuzhnyi and P.T.Cummings | Phase coexistance in polydisperse mixture of hard-sphere colloidal and
flexible chain particles | 6 pages, 4 figures | null | 10.1016/j.cplett.2007.06.052 | null | cond-mat.soft | null | A theoretical scheme for the calculation of the full phase diagram (including
cloud and shadow curves, binodals and distribution functions of the coexisting
phases) for colloid-polymer mixtures with polymer chain length polydispersity
and hard-sphere colloidal and polymeric monomer sizes polydispersity is
proposed. The scheme combines thermodynamic perturbation theory for associating
fluids and recently developed method used to determine the phase diagram of
polydisperse spherical shape colloidal fluids (L.Bellier-Castella {\it et al.},
{\it J.Chem.Phys.} {\bf 113}, 8337(2000)). By way of illustration we present
and discuss the full phase diagram for the mixture with polydispersity in the
size of the hard-sphere colloidal particles.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 20:41:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kalyuzhnyi",
"Y. V.",
""
],
[
"Cummings",
"P. T.",
""
]
] |
0705.1350 | Muxin Han | Muxin Han, S. Jay Olson, Jonathan P. Dowling | Generating Entangled Photons from the Vacuum by Accelerated
Measurements: Quantum Information Theory Meets the Unruh-Davies Effect | 4 pages, 2 figures, clarifying discussions added | Phys.Rev.A78:022302,2008 | 10.1103/PhysRevA.78.022302 | null | quant-ph gr-qc | null | Building on the well-known Unruh-Davies effect, we examine the effects of
projective measurements and quantum communications between accelerated and
stationary observers. We find that the projective measurement by a uniformly
accelerated observer can excite real particles from the vacuum in the inertial
frame, even if no additional particles are created by the measurement process
in the accelerating frame. Furthermore, we show that the particles created by
this accelerating measurement can be highly entangled in the inertial frame,
and it is also possible to use this process to generate even maximally
entangled two-qubit states by a certain arrangement of measurements. As a
byproduct of our analysis, we also show that a single qubit of information can
be perfectly transmitted from the accelerating observer to the inertial one. In
principle, such an effect could be exploited in designing an entangled state
generator for quantum communication.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 00:21:36 GMT"
},
{
"version": "v2",
"created": "Sun, 3 Jun 2007 15:23:58 GMT"
},
{
"version": "v3",
"created": "Wed, 26 Sep 2007 12:01:48 GMT"
}
] | 2009-11-16T00:00:00 | [
[
"Han",
"Muxin",
""
],
[
"Olson",
"S. Jay",
""
],
[
"Dowling",
"Jonathan P.",
""
]
] |
0705.1351 | Matthias Vojta | Oliver R\"osch, Matthias Vojta | Reduced dimensionality in layered quantum dimer magnets: Frustration vs.
inhomogeneous condensates | 23 pages, 18 figs, (v2) new fig for bandwidths, (v3) triplon binding
energy discussed, (v4) small changes for clarification, accepted (PRB) | Phys. Rev. B 76, 224408 (2007) | 10.1103/PhysRevB.76.224408 | null | cond-mat.str-el cond-mat.stat-mech | null | Motivated by recent experiments on BaCuSi2O6, we investigate magnetic
excitations and quantum phase transitions of layered dimer magnets with
inter-layer frustration. We consider two scenarios, (A) a lattice with one
dimer per unit cell and perfect inter-layer frustration, and (B) an enlarged
unit cell with inequivalent layers, with and without perfect frustration. In
all situations, the critical behavior at asymptotically low temperatures is
three-dimensional, but the corresponding crossover scale may be tiny. Magnetic
ordering in case (B) can be discussed in terms of two condensates; remarkably,
perfect frustration renders the proximity effect ineffective. Then, the
ordering transition will be generically split, with clear signatures in
measurable properties. Using a generalized bond-operator method, we calculate
the low-temperature magnetic properties in the paramagnetic and
antiferromagnetic phases. Based on the available experimental data on
BaCuSi2O6, we propose that scenario (B) with inequivalent layers and imperfect
frustration is realized in this material, likely with an additional modulation
of the inter-layer couling along the c axis.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 15:59:07 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 07:41:32 GMT"
},
{
"version": "v3",
"created": "Wed, 23 May 2007 12:25:09 GMT"
},
{
"version": "v4",
"created": "Mon, 19 Nov 2007 12:07:25 GMT"
}
] | 2007-12-13T00:00:00 | [
[
"Rösch",
"Oliver",
""
],
[
"Vojta",
"Matthias",
""
]
] |
0705.1352 | Xin-Nian Wang | Jorge Casalderrey-Solana and Xin-Nian Wang | Energy dependence of jet transport parameter and parton saturation in
quark-gluon plasma | 15 pages in RevTex with 9 figures (v4 final published version) | Phys.Rev.C77:024902,2008 | 10.1103/PhysRevC.77.024902 | null | hep-ph nucl-th | null | We study the evolution and saturation of the gluon distribution function in
the quark-gluon plasma as probed by a propagating parton and its effect on the
computation of jet quenching or transport parameter $\hat{q}$. For thermal
partons, the saturation scale $Q^2_s$ is found to be proportional to the Debye
screening mass $\mu_D^2$. For hard probes, evolution at small $x=Q^2_s/6ET$
leads to jet energy dependence of $\hat{q}$. We study this dependence for both
a conformal gauge theory in weak and strong coupling limit and for (pure gluon)
QCD. The energy dependence can be used to extract the shear viscosity $\eta$ of
the medium since $\eta$ can be related to the transport parameter for thermal
partons in a transport description. We also derive upper bounds on the
transport parameter for both energetic and thermal partons. The later leads to
a lower bound on shear viscosity-to-entropy density ratio which is consistent
with the conjectured lower bound $\eta/s\geq 1/4\pi$. We also discuss the
implications on the study of jet quenching at the BNL Relativistic Heavy Ion
Collider and the CERN Large Hadron Collider and the bulk properties of the
dense matter.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 20:00:31 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 22:11:15 GMT"
},
{
"version": "v3",
"created": "Thu, 24 May 2007 04:17:44 GMT"
},
{
"version": "v4",
"created": "Thu, 31 Jan 2008 02:35:38 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Casalderrey-Solana",
"Jorge",
""
],
[
"Wang",
"Xin-Nian",
""
]
] |
0705.1353 | Toru Misawa | N. Milutinovic, T. Misawa, R. S. Lynch, J. R. Masiero, C. Palma, J. C.
Charlton, D. Kirkman, S. Bockenhauer, D. Tytler | A Catalog of Absorption Lines in Eight HST/STIS E230M 1.0 < z < 1.7
Quasar Spectra | 13 pages, 2 figures, submitted to Monthly Notices of the Royal
Astronomical Society, a complete version with the appendix and all figures is
available at http://www.astro.psu.edu/users/misawa/pub/Paper/qalcat.pdf.gz | null | 10.1111/j.1365-2966.2007.12097.x | null | astro-ph | null | We have produced a catalog of line identifications and equivalent width
measurements for all absorption features in eight ultraviolet echelle quasar
spectra. These spectra were selected as having the highest signal-to-noise
among the HST/STIS spectra obtained with the E230M grating. We identify 56
metal-line systems toward the eight quasars, and present plots of detected
transitions, aligned in velocity-space. We found that about 1/4 - 1/3 of the
features in the Lya forest region, redward of the incidence of the Lyb forest,
are metal lines. High ionization transitions are common. We see both O VI and C
IV in 88 - 90% of the metal-line systems for which the spectra cover the
expected wavelength. Si III is seen in 58%, while low ionization absorption in
C II, Si II, and/or Al II is detected in 50% of the systems for which they are
covered. This catalog will facilitate future studies of the Lya forest and of
metal-line systems of various types.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 13:58:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Milutinovic",
"N.",
""
],
[
"Misawa",
"T.",
""
],
[
"Lynch",
"R. S.",
""
],
[
"Masiero",
"J. R.",
""
],
[
"Palma",
"C.",
""
],
[
"Charlton",
"J. C.",
""
],
[
"Kirkman",
"D.",
""
],
[
"Bockenhauer",
"S.",
""
],
[
"Tytler",
"D.",
""
]
] |
0705.1354 | Jian-Xin Zhu Dr. | Jian-Xin Zhu, A. K. McMahan, M. D. Jones, T. Durakiewicz, J. J. Joyce,
J. M. Wills, R. C. Albers | Spectral Properties of delta-Plutonium: Sensitivity to 5f Occupancy | 6 pages, 2 embedded color figures, to appear in Physical Review B | null | 10.1103/PhysRevB.76.245118 | LA-UR-07-2110 | cond-mat.str-el cond-mat.mtrl-sci | null | By combining the local density approximation (LDA) with dynamical mean field
theory (DMFT), we report a systematic analysis of the spectral properties of
$\delta$-plutonium with varying $5f$ occupancy. The LDA Hamiltonian is
extracted from a tight-binding (TB) fit to full-potential linearized augmented
plane-wave (FP-LAPW) calculations. The DMFT equations are solved by the exact
quantum Monte Carlo (QMC) method and the Hubbard-I approximation. We have shown
for the first time the strong sensitivity of the spectral properties to the
$5f$ occupancy, which suggests using this occupancy as a fitting parameter in
addition to the Hubbard $U$. By comparing with PES data, we conclude that the
``open shell'' $5f^{5}$ configuration gives the best agreement, resolving the
controversy over $5f$ ``open shell'' versus ``close shell'' atomic
configurations in $\delta$-Pu.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 20:05:02 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Oct 2007 18:36:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhu",
"Jian-Xin",
""
],
[
"McMahan",
"A. K.",
""
],
[
"Jones",
"M. D.",
""
],
[
"Durakiewicz",
"T.",
""
],
[
"Joyce",
"J. J.",
""
],
[
"Wills",
"J. M.",
""
],
[
"Albers",
"R. C.",
""
]
] |
0705.1355 | Vivienne Wild | Paul Hewett (1) and Vivienne Wild (2) ((1) IoA Cambridge, (2) MPA
Garching) | K-band Imaging of strong CaII-absorber host galaxies at z~1 | 18 pages, 5 figures. Accepted by MNRAS. Version with full resolution
figures available at
http://www.mpa-garching.mpg.de/~vwild/CaII/CaII_ukirt.pdf | Mon.Not.Roy.Astron.Soc.379:738-754,2007 | 10.1111/j.1365-2966.2007.11959.x | null | astro-ph | null | We present K-band imaging of fields around 30 strong CaII absorption line
systems, at 0.7<z<1.1, three of which are confirmed Damped Lyman-alpha systems.
A significant excess of galaxies is found within 6"0 (~50kpc) from the absorber
line-of-sight. The excess galaxies are preferentially luminous compared to the
population of field galaxies. A model in which field galaxies possess a
luminosity-dependent cross-section for CaII absorption of the form (L/L*)^0.7
reproduces the observations well. The luminosity-dependent cross-section for
the CaII absorbers appears to be significantly stronger than the established
(L/L*)^0.4 dependence for MgII absorbers. The associated galaxies lie at large
physical distances from the CaII-absorbing gas; we find a mean impact parameter
of 24kpc (H0=70km\s\Mpc). Combined with the observed number density of CaII
absorbers the large physical separations result in an inferred filling factor
of only ~10 per cent. The physical origin of the strong CaII absorption remains
unclear, possible explanations vary from very extended disks of the luminous
galaxies to associated dwarf galaxy neighbours, remnants of outflows from the
luminous galaxies, or tidal debris from cannibalism of smaller galaxies.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 16:18:48 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Hewett",
"Paul",
""
],
[
"Wild",
"Vivienne",
""
]
] |
0705.1356 | Frederic Bournaud | F. Bournaud, P.-A. Duc, E. Brinks, M. Boquien, P. Amram, U. Lisenfeld,
B. S. Koribalski, F. Walter and V. Charmandaris | Missing Mass in Collisional Debris from Galaxies | Published in Science. Complete manuscript with appendix available at
http://www.uni-sw.gwdg.de/~paduc/articles/bournaud_tdg_dm.pdf . Published
online in Science Express May 10 issue at
http://www.sciencemag.org/sciencexpress/recent.dtl | Science, 316, 1166 (2007) | 10.1126/science.1142114 | null | astro-ph | null | Recycled dwarf galaxies can form in the collisional debris of massive
galaxies. Theoretical models predict that, contrary to classical galaxies, they
should be free of non-baryonic Dark Matter. Analyzing the observed gas
kinematics of such recycled galaxies with the help of a numerical model, we
demonstrate that they do contain a massive dark component amounting to about
twice the visible matter. Staying within the standard cosmological framework,
this result most likely indicates the presence of large amounts of unseen,
presumably cold, molecular gas. This additional mass should be present in the
disks of their progenitor spiral galaxies, accounting for a significant part of
the so-called missing baryons.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 20:16:37 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Bournaud",
"F.",
""
],
[
"Duc",
"P. -A.",
""
],
[
"Brinks",
"E.",
""
],
[
"Boquien",
"M.",
""
],
[
"Amram",
"P.",
""
],
[
"Lisenfeld",
"U.",
""
],
[
"Koribalski",
"B. S.",
""
],
[
"Walter",
"F.",
""
],
[
"Charmandaris",
"V.",
""
]
] |
0705.1357 | Ricardo D'Elia Matheus | R. D. Matheus, F. S. Navarra, M. Nielsen, R. Rodrigues da Silva | Do the QCD sum rules support four-quark states? | Latex file 6 pages, 6 eps figures, minor changes, references added | Phys.Rev.D76:056005,2007 | 10.1103/PhysRevD.76.056005 | null | hep-ph | null | We test the validity of the QCD sum rules applied to the light scalar mesons,
the charmed mesons $D_{s0}(2317)$ and $D_{s1} (2460)$, and the X(3872) axial
meson, considered as tetraquark states. We find that, with the studied
currents, it is possible to find an acceptable Borel window only for the
X(3872) meson. In such a Borel window we have simultaneouly a good OPE
convergence and a pole contribution which is bigger than the continuum
contribution. We interpret these results as a strong argument against the
assignment of a tetraquark structure for the light scalars and the
$D_{s0}(2317)$ and $D_{s1} (2460)$ mesons.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 20:17:25 GMT"
},
{
"version": "v2",
"created": "Fri, 11 May 2007 18:20:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Matheus",
"R. D.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Nielsen",
"M.",
""
],
[
"da Silva",
"R. Rodrigues",
""
]
] |
0705.1358 | Galina L. Klimchitskaya | R. Castillo-Garza, C.-C. Chang, D. Jimenez, G. L. Klimchitskaya, V. M.
Mostepanenko, and U. Mohideen | Experimental approaches to the difference in the Casimir force through
the varying optical properties of boundary surface | 23 pages of the text, 2 tables, and captions of 12 figures (to appear
in Phys. Rev. A) | Phys.Rev.A75:062114,2007 | 10.1103/PhysRevA.75.062114 | null | quant-ph | null | We propose two novel experiments on the measurement of the Casimir force
acting between a gold coated sphere and semiconductor plates with markedly
different charge carrier densities. In the first of these experiments a
patterned Si plate is used which consists of two sections of different dopant
densities and oscillates in the horizontal direction below a sphere. The
measurement scheme in this experiment is differential, i.e., allows the direct
high-precision measurement of the difference of the Casimir forces between the
sphere and sections of the patterned plate or the difference of the equivalent
pressures between Au and patterned parallel plates with static and dynamic
techniques, respectively. The second experiment proposes to measure the Casimir
force between the same sphere and a VO${}_2$ film which undergoes the
insulator-metal phase transition with the increase of temperature. We report
the present status of the interferometer based variable temperature apparatus
developed to perform both experiments and present the first results on the
calibration and sensitivity. The magnitudes of the Casimir forces and pressures
in the experimental configurations are calculated using different theoretical
approaches to the description of optical and conductivity properties of
semiconductors at low frequencies proposed in the literature. It is shown that
the suggested experiments will aid in the resolution of theoretical problems
arising in the application of the Lifshitz theory at nonzero temperature to
real materials. They will also open new opportunities in nanotechnology.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 20:18:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Castillo-Garza",
"R.",
""
],
[
"Chang",
"C. -C.",
""
],
[
"Jimenez",
"D.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mostepanenko",
"V. M.",
""
],
[
"Mohideen",
"U.",
""
]
] |
0705.1359 | David Brown | J. David Brown | Puncture Evolution of Schwarzschild Black Holes | This is the final version to be published in PRD. One important
change: the phrase "excision by under resolution" is replaced by the more
appropriate phrase "natural excision" | Phys.Rev.D77:044018,2008 | 10.1103/PhysRevD.77.044018 | null | gr-qc | null | The moving puncture method is analyzed for a single, non-spinning black hole.
It is shown that the puncture region is not resolved by current numerical
codes. As a result, the geometry near the puncture appears to evolve to an
infinitely long cylinder of finite areal radius. The puncture itself actually
remains at spacelike infinity throughout the evolution. In the limit of
infinite resolution the data never become stationary. However, at any
reasonable finite resolution the grid points closest to the puncture are
rapidly drawn into the black hole interior by the Gamma-driver shift condition.
The data can then evolve to a stationary state. These results suggest that the
moving puncture technique should be viewed as a type of "natural excision".
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 20:19:00 GMT"
},
{
"version": "v2",
"created": "Fri, 25 May 2007 20:06:07 GMT"
},
{
"version": "v3",
"created": "Tue, 15 Jan 2008 15:04:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Brown",
"J. David",
""
]
] |
0705.1360 | Andrey Zheludev | A. Zheludev, V. O. Garlea, T. Masuda, H. Manaka, L.-P.Regnault,
E.Ressouche, B.Grenier, J.-H. Chung, Y. Qiu, K. Habicht, K. Kiefer, M. Boehm | Dynamics of quantum spin liquid and spin solid phases in IPA-CuCl3 under
field | null | null | null | null | cond-mat.str-el | null | Inelastic and elastic neutron scattering is used to study spin correlations
in the quasi-one dimensional quantum antiferromagnet IPA-CuCl3 in strong
applied magnetic fields. A condensation of magnons and commensurate transverse
long-range ordering is observe at a critical filed $H_c=9.5$ T. The field
dependencies of the energies and polarizations of all magnon branches are
investigated both below and above the transition point. Their dispersion is
measured across the entire 1D Brillouin zone in magnetic fields up to 14 T. The
critical wave vector of magnon spectrum truncation [Masuda et al., Phys. Rev.
Lett. 96, 047210 (2006)] is found to shift from h_c 0.35 at H>H_c. A drastic
reduction of magnon bandwidths in the ordered phase [Garlea et al., Phys. Rev.
Lett. 98, 167202 (2007)] is observed and studied in detail. New features of the
spectrum, presumably related to this bandwidth collapse, are observed just
above the transition field.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 21:00:54 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Zheludev",
"A.",
""
],
[
"Garlea",
"V. O.",
""
],
[
"Masuda",
"T.",
""
],
[
"Manaka",
"H.",
""
],
[
"Regnault",
"L. -P.",
""
],
[
"Ressouche",
"E.",
""
],
[
"Grenier",
"B.",
""
],
[
"Chung",
"J. -H.",
""
],
[
"Qiu",
"Y.",
""
],
[
"Habicht",
"K.",
""
],
[
"Kiefer",
"K.",
""
],
[
"Boehm",
"M.",
""
]
] |
0705.1361 | Mladen Georgiev | Mladen Georgiev | Nonradiative DKR processes: revisiting the theory. II.
Electron-vibrational mode coupling | 22 pages including 4 figures, all pdf format | null | null | null | cond-mat.mtrl-sci | null | We summarize a few proposals for mixing F center states through the mediation
of an appropriate symmetry-breaking vibrational mode. Electron-mode coupling
energies odd-order in the mode coordinates are characteristic of the
pseudo-Jahn-Teller mixing of nearly-degenerate opposite-parity electronic
states mediated by an odd-parity vibrational mode. Coupling energies even order
in the vibrational coordinates lead to a pseudo-Renner mixing of even parity
nearly-degenerate states or to dynamic-Renner mixing of degenerate states of
whatever symmetry. Both Renner mixing energies add up to widen the crossover
splitting of the adiabatic energies thereby enhancing the nonradiative
deexcitation rate.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 21:03:08 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Georgiev",
"Mladen",
""
]
] |
0705.1362 | Hiroyasu Tajima | Hiroyasu Tajima (1), Stefano Finazzi (2), Johann Cohen-Tanugi (1),
James Chiang (1 and 3), Tuneyoshi Kamae (1) ((1) Stanford Linear Accelerator
Center, (2) Scuola Normale Superiore, (3) CRESST, University of Maryland) | Studies of EGRET sources with a novel image restoration technique | 5 pages, 3 figures. Presented at First GLAST Symposium, Stanford
University, Stanford, CA, USA, February 5-8, 2007 | AIPConf.Proc.921:187-189,2007 | 10.1063/1.2757299 | SLAC-PUB-12508 | astro-ph | null | We have developed an image restoration technique based on the Richardson-Lucy
algorithm optimized for GLAST-LAT image analysis. Our algorithm is original
since it utilizes the PSF (point spread function) that is calculated for each
event. This is critical for EGRET and GLAST-LAT image analysis since the PSF
depends on the energy and angle of incident gamma-rays and varies by more than
one order of magnitude. EGRET and GLAST-LAT image analysis also faces Poisson
noise due to low photon statistics. Our technique incorporates wavelet
filtering to minimize noise effects. We present studies of EGRET sources using
this novel image restoration technique for possible identification of extended
gamma-ray sources.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 21:16:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Tajima",
"Hiroyasu",
"",
"1 and 3"
],
[
"Finazzi",
"Stefano",
"",
"1 and 3"
],
[
"Cohen-Tanugi",
"Johann",
"",
"1 and 3"
],
[
"Chiang",
"James",
"",
"1 and 3"
],
[
"Kamae",
"Tuneyoshi",
""
]
] |
0705.1363 | Edoardo Milotti | Edoardo Milotti | Enrico Fermi's view of identical particles | null | null | null | null | physics.hist-ph | null | In this paper I discuss Enrico Fermi's view of identical particles, taking a
lecture that he gave in 1933 as a starting point. Fermi used his lecture as a
basis for a paper that was published in 1934: the paper is in italian and is
not easily accessible to a wide audience, and for this reason its translation
is also given in a section of the present paper.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 21:08:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Milotti",
"Edoardo",
""
]
] |
0705.1364 | Mustaq Ahmed | Mustaq Ahmed and Anna Lubiw | An Approximation Algorithm for Shortest Descending Paths | 14 pages, 3 figures | null | null | CS-2007-14 | cs.CG cs.DS | null | A path from s to t on a polyhedral terrain is descending if the height of a
point p never increases while we move p along the path from s to t. No
efficient algorithm is known to find a shortest descending path (SDP) from s to
t in a polyhedral terrain. We give a simple approximation algorithm that solves
the SDP problem on general terrains. Our algorithm discretizes the terrain with
O(n^2 X / e) Steiner points so that after an O(n^2 X / e * log(n X /e))-time
preprocessing phase for a given vertex s, we can determine a (1+e)-approximate
SDP from s to any point v in O(n) time if v is either a vertex of the terrain
or a Steiner point, and in O(n X /e) time otherwise. Here n is the size of the
terrain, and X is a parameter of the geometry of the terrain.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 22:02:28 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ahmed",
"Mustaq",
""
],
[
"Lubiw",
"Anna",
""
]
] |
0705.1365 | Toshinobu Takagi | T.Takagi, H.Matsuhara, T.Wada, S.Oyabu, K.Imai, C.P.Pearson, H.Hanami,
T.Onaka, N.Fujishiro, D.Ishihara, Y.Ita, H.Kataza, W.Kim, T.Matsumoto,
H.Murakami, Y.Ohyama, I.Sakon, T.Tanabe, K.Uemizu, M.Ueno, H.Watarai, F.Usui,
H.M.Lee, M.Im, S.Serjeant, R.S.Savage, T.Tange, T.Nakagawa | Multi-wavelength analysis of 18um-selected galaxies in the AKARI/IRC
monitor field towards the North Ecliptic Pole | Accepted for publication in PASJ, AKARI special issue | null | 10.1093/pasj/59.sp2.S557 | null | astro-ph | null | We present an initial analysis of AKARI 18um-selected galaxies using all 9
photometric bands at 2-24um available in the InfraRed Camera (IRC), in order to
demonstrate new capabilities of AKARI cosmological surveys. We detected 72
sources at 18um in an area of 50.2 arcmin^2 in the AKARI/IRC monitor field
towards the North Ecliptic Pole (NEP). From this sample, 25 galaxies with
probable redshifts z>~ 0.5 are selected with a single colour cut (N2-N3>0.1)
for a detailed SED analysis with ground-based BVRi'z'JK data. Using an SED
radiative transfer model of starbursts covering the wavelength range UV --
submm, we derive photometric redshifts from the optical-MIR SEDs of
18um-selected galaxies. From the best-fit SED models, we show that the IRC
all-band photometry is capable of tracing the steep rise in flux at the blue
side of the PAH 6.2um emission feature. This indicates that the IRC all-band
photometry is useful to constrain the redshift of infrared galaxies,
specifically for dusty galaxies with a less prominent 4000A break. Also, we
find that the flux dip between the PAH 7.7 and 11.2um emission feature is
recognizable in the observed SEDs of galaxies at z~1. By using such a colour
anomaly due to the PAH and silicate absorption features, unique samples of
ULIRGs at z~1, `silicate-break' galaxies, can be constructed from large
cosmological surveys of AKARI towards the NEP, i.e. the NEP-Deep and NEP-Wide
survey. This pilot study suggests the possibility of detecting many interesting
galaxy properties in the NEP-Deep and Wide surveys, such as a systematic
difference in SEDs between high- and low-z ULIRGs, and a large variation of the
PAH inter-band strength ratio in galaxies at high redshifts. [abridged]
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 02:39:15 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Takagi",
"T.",
""
],
[
"Matsuhara",
"H.",
""
],
[
"Wada",
"T.",
""
],
[
"Oyabu",
"S.",
""
],
[
"Imai",
"K.",
""
],
[
"Pearson",
"C. P.",
""
],
[
"Hanami",
"H.",
""
],
[
"Onaka",
"T.",
""
],
[
"Fujishiro",
"N.",
""
],
[
"Ishihara",
"D.",
""
],
[
"Ita",
"Y.",
""
],
[
"Kataza",
"H.",
""
],
[
"Kim",
"W.",
""
],
[
"Matsumoto",
"T.",
""
],
[
"Murakami",
"H.",
""
],
[
"Ohyama",
"Y.",
""
],
[
"Sakon",
"I.",
""
],
[
"Tanabe",
"T.",
""
],
[
"Uemizu",
"K.",
""
],
[
"Ueno",
"M.",
""
],
[
"Watarai",
"H.",
""
],
[
"Usui",
"F.",
""
],
[
"Lee",
"H. M.",
""
],
[
"Im",
"M.",
""
],
[
"Serjeant",
"S.",
""
],
[
"Savage",
"R. S.",
""
],
[
"Tange",
"T.",
""
],
[
"Nakagawa",
"T.",
""
]
] |
0705.1366 | Daniel Phalen | Daniel J. Phalen and Aaron Pierce | Sfermion Interference in Neutralino Decays at the LHC | 14 pages, 6 figures | Phys.Rev.D76:075002,2007 | 10.1103/PhysRevD.76.075002 | MCTP-07-16 | hep-ph | null | If the two lightest neutralinos of the Minimal Supersymmetric Standard Model
have a mass splitting less than the Z boson mass, interference effects in the
three-body decay chi_2^0 --> chi_1^0 f f can be important. We formulate an
observable that contains information on the nature of the interference: the
ratio BR(chi_2^0 --> chi_1^0 b b) / BR(chi_2^0 --> chi_1^0 l+ l-). This will
give a constraint on the supersymmetry breaking parameters that is
complementary to many techniques already existing in the literature. We present
some ideas on how to perform a simple counting experiment to determine this
ratio.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 21:53:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Phalen",
"Daniel J.",
""
],
[
"Pierce",
"Aaron",
""
]
] |
0705.1367 | Riccardo Pucella | Riccardo Pucella | Logic Column 18: Alternative Logics: A Book Review | 10 pages | null | null | null | cs.LO | null | This article discusses two books on the topic of alternative logics in
science: "Deviant Logic", by Susan Haack, and "Alternative Logics: Do Sciences
Need Them?", edited by Paul Weingartner.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 21:56:15 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pucella",
"Riccardo",
""
]
] |
0705.1368 | Amer Iqbal | Sergei Gukov, Amer Iqbal, Can Kozcaz, Cumrun Vafa | Link Homologies and the Refined Topological Vertex | 38 pages, 5 figures | Commun.Math.Phys.298:757-785,2010 | 10.1007/s00220-010-1045-4 | null | hep-th math.AG math.GT | null | We establish a direct map between refined topological vertex and sl(N)
homological invariants of the of Hopf link, which include Khovanov-Rozansky
homology as a special case. This relation provides an exact answer for
homological invariants of the of Hopf link, whose components are colored by
arbitrary representations of sl(N). At present, the mathematical formulation of
such homological invariants is available only for the fundamental
representation (the Khovanov-Rozansky theory) and the relation with the refined
topological vertex should be useful for categorifying quantum group invariants
associated with other representations (R_1, R_2). Our result is a first direct
verification of a series of conjectures which identifies link homologies with
the Hilbert space of BPS states in the presence of branes, where the physical
interpretation of gradings is in terms of charges of the branes ending on
Lagrangian branes.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 01:06:54 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Gukov",
"Sergei",
""
],
[
"Iqbal",
"Amer",
""
],
[
"Kozcaz",
"Can",
""
],
[
"Vafa",
"Cumrun",
""
]
] |
0705.1369 | R. R. Cuzinatto | R. Aldrovandi, R. R. Cuzinatto, L. G. Medeiros | Interacting Constituents in Cosmology | 24 pages, 6 figures. It includes results presented in "Cosmic
Acceleration from Elementary Interactions" [arXiv:gr-qc/0512135]. Citations
added in v.2 | Int.J.Mod.Phys.D17:857-879,2008 | 10.1142/S0218271808012541 | null | gr-qc | null | Universe evolution, as described by Friedmann's equations, is determined by
source terms fixed by the choice of pressure $\times$ energy-density equations
of state $p(\rho)$. The usual approach in Cosmology considers equations of
state accounting only for kinematic terms, ignoring the contribution from the
interactions between the particles constituting the source fluid. In this work
the importance of these neglected terms is emphasized. A systematic method,
based on the Statistical Mechanics of real fluids, is proposed to include them.
A toy-model is presented which shows how such interaction terms can engender
significant cosmological effects.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 22:21:46 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 19:52:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aldrovandi",
"R.",
""
],
[
"Cuzinatto",
"R. R.",
""
],
[
"Medeiros",
"L. G.",
""
]
] |
0705.1370 | {\L}ukasz Pankowski | {\L}ukasz Pankowski and Barbara Synak-Radtke | Can quantum correlations be completely quantum? | 8 pages, 5 figures, REVTeX 4 | J. Phys. A: Math. Theor. 41 (2008) 075308 | 10.1088/1751-8113/41/7/075308 | null | quant-ph | null | Deficit of information zero-way was proposed in HorodeckiHHOSSS2005 as one of
possible measures of quantumness of correlations. Numerical calculations
suggested that there exist such states for which this quantity is almost equal
to mutual information. In this paper we present a family of states for which we
have equality between above measure of quantumness of correlations and the
measure of total correlations -- mutual information. It means that whole
correlations in these states have, in some sense, quantum character and that
quantum correlations do not necessarily imply classical correlations. We prove
this intriguing feature for a subclass of 2x2 separable states. We also present
numerical result suggesting that this interesting situation might also happen
for 2x2 entangled states.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 17:53:54 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Pankowski",
"Łukasz",
""
],
[
"Synak-Radtke",
"Barbara",
""
]
] |
0705.1371 | Tomas Liko | Tomas Liko and Ivan Booth | Isolated horizons in higher-dimensional Einstein-Gauss-Bonnet gravity | 18 pages; 1 figure; v2: 19 pages; 2 references added; v3: 19 pages;
minor corrections; 1 reference added; to appear in Classical and Quantum
Gravity | Class.Quant.Grav.24:3769,2007 | 10.1088/0264-9381/24/14/015 | null | gr-qc | null | The isolated horizon framework was introduced in order to provide a local
description of black holes that are in equilibrium with their (possibly
dynamic) environment. Over the past several years, the framework has been
extended to include matter fields (dilaton, Yang-Mills etc) in D=4 dimensions
and cosmological constant in $D\geq3$ dimensions. In this article we present a
further extension of the framework that includes black holes in
higher-dimensional Einstein-Gauss-Bonnet (EGB) gravity. In particular, we
construct a covariant phase space for EGB gravity in arbitrary dimensions which
allows us to derive the first law. We find that the entropy of a weakly
isolated and non-rotating horizon is given by
$\mathcal{S}=(1/4G_{D})\oint_{S^{D-2}}\bm{\tilde{\epsilon}}(1+2\alpha\mathcal{R})$.
In this expression $S^{D-2}$ is the $(D-2)$-dimensional cross section of the
horizon with area form $\bm{\tilde{\epsilon}}$ and Ricci scalar $\mathcal{R}$,
$G_{D}$ is the $D$-dimensional Newton constant and $\alpha$ is the Gauss-Bonnet
parameter. This expression for the horizon entropy is in agreement with those
predicted by the Euclidean and Noether charge methods. Thus we extend the
isolated horizon framework beyond Einstein gravity.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 19:54:24 GMT"
},
{
"version": "v2",
"created": "Mon, 21 May 2007 17:09:42 GMT"
},
{
"version": "v3",
"created": "Wed, 13 Jun 2007 15:28:19 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Liko",
"Tomas",
""
],
[
"Booth",
"Ivan",
""
]
] |
0705.1372 | Francesco Ticozzi | Francesco Ticozzi and Lorenza Viola | Quantum Markovian Subsystems: Invariance, Attractivity, and Control | 16 pages, no figures. Revised version with new title, corrected
typos, partial rewriting of Section III.E and some other minor changes | IEEE Transaction on Automatic Control, 53(9):2048-2063, 2008 | null | null | quant-ph | null | We characterize the dynamical behavior of continuous-time, Markovian quantum
systems with respect to a subsystem of interest. Markovian dynamics describes a
wide class of open quantum systems of relevance to quantum information
processing, subsystem encodings offering a general pathway to faithfully
represent quantum information. We provide explicit linear-algebraic
characterizations of the notion of invariant and noiseless subsystem for
Markovian master equations, under different robustness assumptions for
model-parameter and initial-state variations. The stronger concept of an
attractive quantum subsystem is introduced, and sufficient existence conditions
are identified based on Lyapunov's stability techniques. As a main control
application, we address the potential of output-feedback Markovian control
strategies for quantum pure state-stabilization and noiseless-subspace
generation. In particular, explicit results for the synthesis of stabilizing
semigroups and noiseless subspaces in finite-dimensional Markovian systems are
obtained.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 22:36:38 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Mar 2008 15:51:14 GMT"
}
] | 2010-12-08T00:00:00 | [
[
"Ticozzi",
"Francesco",
""
],
[
"Viola",
"Lorenza",
""
]
] |
0705.1373 | Enwei Liang | En-Wei Liang, Bin-Bin Zhang, Bing Zhang | A Comprehensive Analysis of the Swift/XRT Data: II. Diverse Physical
Origins of the Shallow Decay Segment | 27 pages in emulateapj style, 8 figures, accepted for publication in
ApJ, optical data fitting and references added, conclusions unchanged. This
is the second paper of a series. Paper I see astro-ph/0612246 (ApJ, 2007, in
press) | null | 10.1086/521870 | null | astro-ph | null | We analyze the properties of the shallow decay segment with a sample of 53
long Swift GRBs. We show that the distributions of its characteristics are
log-normal or normal, and its isotropic X-ray energy (E_{iso,X}) is linearly
correlated with the prompt gamma-ray energy, but with a steeper photon spectrum
except for some X-ray flashes. No significant spectral evolution is observed
from this phase to the follow-up phase, and the follow-up phase is usually
consistent with the external shock models, implying that this segment likely
due to a refreshed external shock. Within this scenario, the data are generally
consistent with a roughly constant injection luminosity up to the end of this
phase $t_b$. A positive correlation between E_{iso, X} and t_b also favors this
scenario. Among the 13 bursts that have well-sampled optical light curves, 6
have an optical break around t_b and the breaks are consistent with being
achromatic. However, the other 7 bursts either do not show an optical break or
have a break at a different epoch than t_b. This raises a concern to the energy
injection scenario, suggesting that the optical and X-ray emissions may not be
the same component at least for a fraction of bursts. There are 4 significant
outliers in the sample, and this shallow decau phase in these bursts is
immediately followed by a very steep decay after t_b, which is inconsistent
with any external shock model. The optical data of these bursts evolve
independently from the X-ray data. These X-ray plateaus likely have an internal
origin and demand continuous operation of a long-term GRB central engine. We
conclude that the observed shallow decay phase likely has diverse physical
origins(Abridged).
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 18:36:31 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jul 2007 20:36:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Liang",
"En-Wei",
""
],
[
"Zhang",
"Bin-Bin",
""
],
[
"Zhang",
"Bing",
""
]
] |
0705.1374 | Roberto Soria | R. Soria (MSSL/UCL), Z. Kuncic (University of Sydney) | Black hole mass estimates from soft X-ray spectra | 14 pages, accepted for publication on Advances in Space Research.
Based on work presented at the 2006 Cospar Scientific Assembly | Adv.Space Res.42:517-522,2008 | 10.1016/j.asr.2007.03.099 | null | astro-ph | null | In the absence of direct kinematic measurements, the mass of an accreting
black hole is sometimes inferred from the X-ray spectral parameters of its
accretion disk; specifically, from the temperature and normalization of a
disk-blackbody model fit. Suitable corrections have to be introduced when the
accretion rate approaches or exceeds the Eddington limit. We summarize
phenomenological models that can explain the very high state, with apparently
higher disk temperatures and lower inner-disk radii. Conversely, ultraluminous
X-ray sources often contain cooler disks with large characteristic radii. We
introduce another phenomenological model for this accretion state. We argue
that a standard disk dominates the radiative output for radii larger than a
characteristic transition radius R_c ~ mdot x R_{ISCO}, where mdot is the
accretion rate in Eddington units and R_{ISCO} is the innermost stable orbit.
For R_{ISCO} < R < R_c, most of the accretion power is released via non-thermal
processes. We predict the location of such sources in a luminosity-temperature
plot. We conclude that black holes with masses ~ 50-100 Msun accreting at mdot
~ 10-20 may explain the X-ray properties of many ULXs.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 22:56:29 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Soria",
"R.",
"",
"MSSL/UCL"
],
[
"Kuncic",
"Z.",
"",
"University of Sydney"
]
] |
0705.1375 | Ozer Ozturk | Piotr Pragacz | Thom polynomials and Schur functions: the singularities I_{2,2}(-) | 21 pages; Ann. Inst. Fourier vol.57; this is expanded Sect.4 of
math.AG/0509234; new added results: Theorem 11 (based on P-ideals of
singularities) and explicit expressions for the coefficients of the Thom
polynomials of I_22(-) (Propositions 17, 18, 19); references updated | null | null | null | math.AG | null | We give the Thom polynomials for the singularities $I_{2,2}$ associated with
maps $({\bf C}^{\bullet},0) \to ({\bf C}^{\bullet+k},0)$ with parameter $k\ge
0$. Our computations combine the characterization of Thom polynomials via the
``method of restriction equations'' of Rimanyi et al. with the techniques of
Schur functions.
| [
{
"version": "v1",
"created": "Wed, 9 May 2007 23:17:23 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pragacz",
"Piotr",
""
]
] |
0705.1376 | Tim Bedding | Timothy R. Bedding and Hans Kjeldsen | Observations of solar-like oscillations | Invited review talk at the "Vienna Workshop on the Future of
Asteroseismology", 20-22 September 2006, to appear in Communications in
Asteroseismology | null | 10.1553/cia150s106 | May 2007 | astro-ph | null | There has been tremendous progress in observing oscillations in solar-type
stars. In a few short years we have moved from ambiguous detections to firm
measurements. We briefly review the recent results, most of which have come
from high-precision Doppler measurements. We also review briefly the results on
giant and supergiant stars and the prospects for the future.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 00:20:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bedding",
"Timothy R.",
""
],
[
"Kjeldsen",
"Hans",
""
]
] |
0705.1377 | Kyung Hyuk Kim | Kyung Hyuk Kim and Marcel den Nijs | Dynamic Screening in a Two-Species Asymmetric Exclusion Process | 14 pages and 15 figures | Phys. Rev. E 76, 021107 (2007) | 10.1103/PhysRevE.76.021107 | null | cond-mat.stat-mech | null | The dynamic scaling properties of the one dimensional Burgers equation are
expected to change with the inclusion of additional conserved degrees of
freedom. We study this by means of 1-D driven lattice gas models that conserve
both mass and momentum. The most elementary version of this is the
Arndt-Heinzel-Rittenberg (AHR) process, which is usually presented as a two
species diffusion process, with particles of opposite charge hopping in
opposite directions and with a variable passing probability.
From the hydrodynamics perspective this can be viewed as two coupled Burgers
equations, with the number of positive and negative momentum quanta
individually conserved. We determine the dynamic scaling dimension of the AHR
process from the time evolution of the two-point correlation functions, and
find numerically that the dynamic critical exponent is consistent with simple
Kardar-Parisi-Zhang (KPZ) type scaling. We establish that this is the result of
perfect screening of fluctuations in the stationary state. The two-point
correlations decay exponentially in our simulations and in such a manner that
in terms of quasi-particles, fluctuations fully screen each other at coarse
grained length scales. We prove this screening rigorously using the analytic
matrix product structure of the stationary state. The proof suggests the
existence of a topological invariant. The process remains in the KPZ
universality class but only in the sense of a factorization, as $({KPZ})^2$.
The two Burgers equations decouple at large length scales due to the perfect
screening.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 01:39:04 GMT"
}
] | 2008-02-01T00:00:00 | [
[
"Kim",
"Kyung Hyuk",
""
],
[
"Nijs",
"Marcel den",
""
]
] |
0705.1378 | Shane Walsh | S.M. Walsh, H. Jerjen, B. Willman | A Pair of Bootes: A New Milky Way Satellite | Accept by ApJL May 9, 2007 | Astrophys.J.662:L83-L86,2007 | 10.1086/519684 | null | astro-ph | null | As part of preparations for a southern sky search for faint Milky Way dwarf
galaxy satellites, we report the discovery of a stellar overdensity in the
Sloan Digital Sky Survey Data Release 5, lying at an angular distance of only
1.5 degrees from the recently discovered Bo{\"o}tes dwarf. The overdensity was
detected well above statistical noise by employing a sophisticated data mining
algorithm and does not correspond to any catalogued object. Overlaid isochrones
using stellar population synthesis models show that the color-magnitude diagram
of that region has the signature of an old (12 Gyr), metal-poor (${\rm
Fe/H}\approx-2.0$) stellar population at a tentative distance of 60 kpc,
evidently the same heliocentric distance as the Bo\"otes dwarf. We estimate the
new object to have a total magnitude of $M_{V}\sim-3.1\pm1.1$ mag and a
half-light radius of $r_{h}=4'.1\pm1'.6$ ($72\pm28$ pc) placing it in an
apparent $40<r_{h}<100$ pc void between globular clusters and dwarf galaxies,
occupied only by another recently discovered Milky Way Satellite, Coma
Berenices.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 01:44:11 GMT"
}
] | 2010-03-01T00:00:00 | [
[
"Walsh",
"S. M.",
""
],
[
"Jerjen",
"H.",
""
],
[
"Willman",
"B.",
""
]
] |
0705.1379 | Hengkui Wu | Xin-Heng Guo, Heng-Kui Wu | The Average Kinetic Energy of the Heavy Quark in $\Lambda_b$ in the
Bethe-Salpeter Equation Approach | 19 pages, 2 figures, accepted for publication in Phys. Lett. B | Phys.Lett.B654:97-103,2007 | 10.1016/j.physletb.2007.05.007 | null | hep-ph | null | In the previous paper, based on the $SU(2)_{f}\times SU(2)_{s}$ heavy quark
symmetries of the QCD Lagrangian in the heavy quark limit, the Bethe-Salpeter
equation for the heavy baryon $\Lambda_b$ was established with the picture that
$\Lambda_b$ is composed of a heavy quark and a scalar light diquark. In the
present work, we apply this model to calculate $\mu_\pi^2$ for $\Lambda_b$, the
average kinetic energy of the heavy quark inside $\Lambda_{b}$. This quantity
is particularly interesting since it can be measured in experiments and since
it contributes to the inclusive semileptonic decays of $\Lambda_b$ when
contributions from higher order terms in $1/M_b$ expansions are taken into
account and consequently influences the determination of the
Cabibbo-Kobayashi-Maskawa matrix elements $V_{ub}$ and $V_{cb}$. We find that
$\mu_\pi^2$ for $\Lambda_b$ is $0.25GeV^2$ $\sim$ $0.95GeV^2$, depending on the
parameters in the model including the light diquark mass and the interaction
strength between the heavy quark and the light diquark in the kernel of the BS
equation. We also find that this result is consistent with the value of
$\mu_\pi^2$ for $\Lambda_b$ which is derived from the experimental value of
$\mu_\pi^2$ for the $B$ meson with the aid of the heavy quark effective theory.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 01:46:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Guo",
"Xin-Heng",
""
],
[
"Wu",
"Heng-Kui",
""
]
] |
0705.1380 | Lin Tian | L. Tian and R. W. Simmonds | A Josephson Junction Microscope for Low-frequency Fluctuators | 4 pages, 3 figures | null | 10.1103/PhysRevLett.99.137002 | null | cond-mat.mes-hall quant-ph | null | The high-Q harmonic oscillator mode of a Josephson junction can be used as a
novel probe of spurious two-level systems (TLSs) inside the amorphous oxide
tunnel barriers of the junction. In particular, we show that spectroscopic
transmission measurements of the junction resonator mode can reveal how the
coupling magnitude between the junction and the TLSs varies with an external
magnetic field applied in the plane of the tunnel barrier. The proposed
experiments offer the possibility of clearly resolving the underlying coupling
mechanism for these spurious TLSs, an important decoherence source limiting the
quality of superconducting quantum devices.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 02:06:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tian",
"L.",
""
],
[
"Simmonds",
"R. W.",
""
]
] |
0705.1381 | Florentin Smarandache | Florentin Smarandache | On Two of Erd\"os's Open Problems | 3 pages | Gamma, XXV, Year VIII, No. 3, p. 5, 1986 | null | null | math.GM | null | In this short note we present some remarks and conjectures on two of
Erd\"os's open problems in number theory.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 02:43:25 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Smarandache",
"Florentin",
""
]
] |
0705.1382 | Eddy Yusuf | Eddy Yusuf, B. J. Powell, and Ross H. McKenzie | Antiferromagnetic Spin Fluctuations in the Metallic Phase of
Quasi-Two-Dimensional Organic Superconductors | 11 pages, 2 figures. Accepted for publication in Phys. Rev. B | Phys. Rev. B 75, 214515 (2007) | 10.1103/PhysRevB.75.214515 | null | cond-mat.str-el cond-mat.supr-con | null | We give a quantitative analysis of the previously published nuclear magnetic
resonance (NMR) experiments in the k-(ET)2X family of organic charge transfer
salts by using the phenomenological spin fluctuation model of Moriya, and
Millis, Monien and Pines (M-MMP). For temperatures above T_nmr ~ 50 K, the
model gives a good quantitative description of the data in the metallic phases
of several k-(ET)2X materials. These materials display antiferromagnetic
correlation lengths which increase with decreasing temperature and grow to
several lattice constants by T_nmr. It is shown that the fact that the
dimensionless Korringa ratio is much larger than unity is inconsistent with a
broad class of theoretical models (such as dynamical mean-field theory) which
neglects spatial correlations and/or vertex corrections. For materials close to
the Mott insulating phase the nuclear spin relaxation rate, the Knight shift
and the Korringa ratio all decrease significantly with decreasing temperature
below T_nmr. This cannot be described by the M-MMP model and the most natural
explanation is that a pseudogap, similar to that observed in the underdoped
cuprate superconductors, opens up in the density of states below T_nmr. Such a
pseudogap has recently been predicted to occur in the dimerised organic charge
transfer salts materials by the resonating valence bond (RVB) theory. We
propose specific new experiments on organic superconductors to elucidate these
issues. For example, measurements to see if high magnetic fields or high
pressures can be used to close the pseudogap would be extremely valuable.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 02:47:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yusuf",
"Eddy",
""
],
[
"Powell",
"B. J.",
""
],
[
"McKenzie",
"Ross H.",
""
]
] |
0705.1383 | Takao Suzuki | Takao Suzuki, Fumiko Yamada, Isao Watanabe, Takayuki Goto, Akira
Oosawa, and Hidekazu Tanaka | The effect of randomness on the quantum spin system
Tl$_{1-x}$K$_x$CuCl$_3$ with ${\boldmath $x$}$ = 0.44 studied by the
Zero-field Muon-Spin-Relaxation (ZF-$\mu$SR) method | Accepted on J. Phys. Soc. Jpn | null | 10.1143/JPSJ.76.074704 | null | cond-mat.str-el | null | Zero-field muon-spin-relaxation (ZF-{\boldmath $\mu$}SR) measurements were
carried out down to 80 mK on the randomness bond system Tl$_{1-x}$K$_x$CuCl$_3$
with $x$ = 0.44. Time spectra are well fitted by the stretched exponential
function $\exp (-\lambda t)^{\beta}$. The muon spin relaxation rate $\lambda$
increases rapidly with decreasing temperature, and $\beta$ tends to 0.5 at 80
mK. The divergent increase of $\lambda$ suggests the critical slowing down of
the frequency of the Cu-3{\it d} spin fluctuations toward a spin frozen state
below 80 mK, and the root-exponential-like behavior of the time spectrum
indicates that the origin of the relaxation is possibly the spatially-fixed
fluctuating dilute moments.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 02:54:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Suzuki",
"Takao",
""
],
[
"Yamada",
"Fumiko",
""
],
[
"Watanabe",
"Isao",
""
],
[
"Goto",
"Takayuki",
""
],
[
"Oosawa",
"Akira",
""
],
[
"Tanaka",
"Hidekazu",
""
]
] |
0705.1384 | Navin Kashyap | Navin Kashyap | Matroid Pathwidth and Code Trellis Complexity | Submitted to SIAM Journal on Discrete Mathematics; 18 pages, 6
figures | null | null | null | cs.DM cs.IT math.IT | null | We relate the notion of matroid pathwidth to the minimum trellis
state-complexity (which we term trellis-width) of a linear code, and to the
pathwidth of a graph. By reducing from the problem of computing the pathwidth
of a graph, we show that the problem of determining the pathwidth of a
representable matroid is NP-hard. Consequently, the problem of computing the
trellis-width of a linear code is also NP-hard. For a finite field $\F$, we
also consider the class of $\F$-representable matroids of pathwidth at most
$w$, and correspondingly, the family of linear codes over $\F$ with
trellis-width at most $w$. These are easily seen to be minor-closed. Since
these matroids (and codes) have branchwidth at most $w$, a result of Geelen and
Whittle shows that such matroids (and the corresponding codes) are
characterized by finitely many excluded minors. We provide the complete list of
excluded minors for $w=1$, and give a partial list for $w=2$.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 03:00:54 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Kashyap",
"Navin",
""
]
] |
0705.1385 | Eric Cavalcanti | E. G. Cavalcanti, C. J. Foster, M. D. Reid and P. D. Drummond | Bell inequalities for continuous-variable correlations | 4 pages, 1 figure. v2: New results on detector efficiencies and
macroscopic limit, new co-author, changed title and abstract, changed figure,
added journal reference and DOI | Phys. Rev. Lett. 99, 210405 (2007) | 10.1103/PhysRevLett.99.210405 | null | quant-ph | null | We derive a new class of correlation Bell-type inequalities. The inequalities
are valid for any number of outcomes of two observables per each of n parties,
including continuous and unbounded observables. We show that there are no
first-moment correlation Bell inequalities for that scenario, but such
inequalities can be found if one considers at least second moments. The
derivation stems from a simple variance inequality by setting local commutators
to zero. We show that above a constant detector efficiency threshold, the
continuous variable Bell violation can survive even in the macroscopic limit of
large n. This method can be used to derive other well-known Bell inequalities,
shedding new light on the importance of non-commutativity for violations of
local realism.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 03:09:13 GMT"
},
{
"version": "v2",
"created": "Sat, 24 Nov 2007 07:50:42 GMT"
}
] | 2007-11-24T00:00:00 | [
[
"Cavalcanti",
"E. G.",
""
],
[
"Foster",
"C. J.",
""
],
[
"Reid",
"M. D.",
""
],
[
"Drummond",
"P. D.",
""
]
] |
0705.1386 | Thomas Lam | Thomas Lam and Mark Shimozono | Quantum cohomology of G/P and homology of affine Grassmannian | 29 pages | null | null | null | math.AG math.CO | null | Let G be a simple and simply-connected complex algebraic group, P \subset G a
parabolic subgroup. We prove an unpublished result of D. Peterson which states
that the quantum cohomology QH^*(G/P) of a flag variety is, up to localization,
a quotient of the homology H_*(Gr_G) of the affine Grassmannian \Gr_G of G. As
a consequence, all three-point genus zero Gromov-Witten invariants of $G/P$ are
identified with homology Schubert structure constants of H_*(Gr_G),
establishing the equivalence of the quantum and homology affine Schubert
calculi.
For the case G = B, we use the Mihalcea's equivariant quantum Chevalley
formula for QH^*(G/B), together with relationships between the quantum Bruhat
graph of Brenti, Fomin and Postnikov and the Bruhat order on the affine Weyl
group. As byproducts we obtain formulae for affine Schubert homology classes in
terms of quantum Schubert polynomials. We give some applications in quantum
cohomology.
Our main results extend to the torus-equivariant setting.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 03:15:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lam",
"Thomas",
""
],
[
"Shimozono",
"Mark",
""
]
] |
0705.1387 | Hyung Mok Lee | Hyung Mok Lee, Myungshin Im, Takehiko Wada, Hyunjin Shim, Seong Jin
Kim, Myung Gyoon Lee, Narae Hwang, Hideo Matsuhara, Takao Nakagawa, Shinki
Oyabu, Chris P. Pearson, Toshinobu Takagi, Takashi Onaka, Naofumi Fujishiro,
Hitoshi Hanami, Daisuke Ishihara, Yoshifusa Ita, Hirokazu Kataza, Woojung
Kim, Toshio Matusmoto, Hiroshi Murakami, Youichi Ohyama, Itsuki Sakon,
Toshiko Tanabe, Kazunori Uemizu, Munetaka Ueno, Fumihiko Usui, and Hidenori
Watarai | Nature of Infrared Sources in 11 micron Selected Sample from Early Data
of the AKARI North Ecliptic Pole Deep Survey | 22 pages, 10 figures | null | 10.1093/pasj/59.sp2.S529 | null | astro-ph | null | We present the properties of 11 $\mu$m selected sources detected in the early
data of the North Ecliptic Pole Deep (NEP-Deep) Survey of AKARI. The data set
covers 6 wavelength bands from 2.5 to 11 $\mu$m, with the exposure time of 10 ~
20 minutes. This field lies within the CFHT survey with four filter bands ($g',
r', i',z'), enabling us to establish nearly continuous spectral energy
distributions (SEDs) for wavelengths ranging from 0.4 to 11 $\mu$m. The main
sample studied here consists of 71 sources whose 11 $\mu$m AB magnitudes are
equal to or brighter than 18.5 (251 $\mu$Jy), which is complete to more than
90%. The 11 $\mu$m band has an advantage of sampling star forming galaxies with
low to medium redshifts since the prominent PAH feature shifts into this band.
As expected, we find that the majority (~68%) of 11 $\mu$m bright sources are
star forming galaxies at 0.2 < z < 0.7 with $L_{IR} ~ 10^{10}$ -- $10^{12}
L_{\odot}$ based on the detailed modelling of SEDs. We also find four AGNs
lying at various redshifts in the main sample. In addition, we discuss a few
sources which have non-typical SEDs of the main sample, including a brown dwarf
candidate, a steep power-law source, flat spectrum object, and an early-type
galaxy at moderate redshift.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 04:07:41 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 05:09:24 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Lee",
"Hyung Mok",
""
],
[
"Im",
"Myungshin",
""
],
[
"Wada",
"Takehiko",
""
],
[
"Shim",
"Hyunjin",
""
],
[
"Kim",
"Seong Jin",
""
],
[
"Lee",
"Myung Gyoon",
""
],
[
"Hwang",
"Narae",
""
],
[
"Matsuhara",
"Hideo",
""
],
[
"Nakagawa",
"Takao",
""
],
[
"Oyabu",
"Shinki",
""
],
[
"Pearson",
"Chris P.",
""
],
[
"Takagi",
"Toshinobu",
""
],
[
"Onaka",
"Takashi",
""
],
[
"Fujishiro",
"Naofumi",
""
],
[
"Hanami",
"Hitoshi",
""
],
[
"Ishihara",
"Daisuke",
""
],
[
"Ita",
"Yoshifusa",
""
],
[
"Kataza",
"Hirokazu",
""
],
[
"Kim",
"Woojung",
""
],
[
"Matusmoto",
"Toshio",
""
],
[
"Murakami",
"Hiroshi",
""
],
[
"Ohyama",
"Youichi",
""
],
[
"Sakon",
"Itsuki",
""
],
[
"Tanabe",
"Toshiko",
""
],
[
"Uemizu",
"Kazunori",
""
],
[
"Ueno",
"Munetaka",
""
],
[
"Usui",
"Fumihiko",
""
],
[
"Watarai",
"Hidenori",
""
]
] |
0705.1388 | Naomichi Hatano | Naomichi Hatano (IIS, U. Tokyo), Keita Sasada (Dept. Phys., U. Tokyo),
Hiroaki Nakamura (NIFS), Tomio Petrosky (U Texas at Austin) | Some properties of the resonant state in quantum mechanics and its
computation | 20 pages, 12 figures embedded | Prog.Theor.Phys.119:187-222,2008 | 10.1143/PTP.119.187 | null | quant-ph cond-mat.mes-hall cond-mat.stat-mech nucl-th physics.atom-ph | null | The resonant state of the open quantum system is studied from the viewpoint
of the outgoing momentum flux. We show that the number of particles is
conserved for a resonant state, if we use an expanding volume of integration in
order to take account of the outgoing momentum flux; the number of particles
would decay exponentially in a fixed volume of integration. Moreover, we
introduce new numerical methods of treating the resonant state with the use of
the effective potential. We first give a numerical method of finding a
resonance pole in the complex energy plane. The method seeks an energy
eigenvalue iteratively. We found that our method leads to a super-convergence,
the convergence exponential with respect to the iteration step. The present
method is completely independent of commonly used complex scaling. We also give
a numerical trick for computing the time evolution of the resonant state in a
limited spatial area. Since the wave function of the resonant state is
diverging away from the scattering potential, it has been previously difficult
to follow its time evolution numerically in a finite area.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 04:05:24 GMT"
},
{
"version": "v2",
"created": "Mon, 6 Aug 2007 05:08:14 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Hatano",
"Naomichi",
"",
"IIS, U. Tokyo"
],
[
"Sasada",
"Keita",
"",
"Dept. Phys., U. Tokyo"
],
[
"Nakamura",
"Hiroaki",
"",
"NIFS"
],
[
"Petrosky",
"Tomio",
"",
"U Texas at Austin"
]
] |
0705.1389 | Yurie Okabe | Yurie Okabe, Yuu Yagi, and Masaki Sasai | Effects of the DNA state fluctuation on single-cell dynamics of
self-regulating gene | 18 pages, 5 figures | null | 10.1063/1.2768353 | null | q-bio.MN q-bio.QM | null | A dynamical mean-field theory is developed to analyze stochastic single-cell
dynamics of gene expression. By explicitly taking account of nonequilibrium and
nonadiabatic features of the DNA state fluctuation, two-time correlation
functions and response functions of single-cell dynamics are derived. The
method is applied to a self-regulating gene to predict a rich variety of
dynamical phenomena such as anomalous increase of relaxation time and
oscillatory decay of correlations. Effective "temperature" defined as the ratio
of the correlation to the response in the protein number is small when the DNA
state change is frequent, while it grows large when the DNA state change is
infrequent, indicating the strong enhancement of noise in the latter case.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 05:50:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Okabe",
"Yurie",
""
],
[
"Yagi",
"Yuu",
""
],
[
"Sasai",
"Masaki",
""
]
] |
0705.1390 | Tshilidzi Marwala | M.A. Herzog, T. Marwala and P.S. Heyns | Machine and Component Residual Life Estimation through the Application
of Neural Networks | 22 pages | null | null | null | cs.CE | null | This paper concerns the use of neural networks for predicting the residual
life of machines and components. In addition, the advantage of using
condition-monitoring data to enhance the predictive capability of these neural
networks was also investigated. A number of neural network variations were
trained and tested with the data of two different reliability-related datasets.
The first dataset represents the renewal case where the failed unit is repaired
and restored to a good-as-new condition. Data was collected in the laboratory
by subjecting a series of similar test pieces to fatigue loading with a
hydraulic actuator. The average prediction error of the various neural networks
being compared varied from 431 to 841 seconds on this dataset, where test
pieces had a characteristic life of 8,971 seconds. The second dataset was
collected from a group of pumps used to circulate a water and magnetite
solution within a plant. The data therefore originated from a repaired system
affected by reliability degradation. When optimized, the multi-layer perceptron
neural networks trained with the Levenberg-Marquardt algorithm and the general
regression neural network produced a sum-of-squares error within 11.1% of each
other. The potential for using neural networks for residual life prediction and
the advantage of incorporating condition-based data into the model were proven
for both examples.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 05:52:22 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Herzog",
"M. A.",
""
],
[
"Marwala",
"T.",
""
],
[
"Heyns",
"P. S.",
""
]
] |
0705.1391 | Rhys Davies | Rhys Davies, Damien P. George | Fermions, scalars and Randall-Sundrum gravity on domain-wall branes | 16 pages, 3 figures; v2, added references and clarified discussion;
v3, added figures with accompanying discussion; v4, modifications to
spontaneous symmetry breaking discussion, version to appear in PRD | Phys.Rev.D76:104010,2007 | 10.1103/PhysRevD.76.104010 | null | hep-ph | null | We analyse the general features of localisation of fermions and scalars in
smoothed field-theoretical versions of the type 2 Randall- Sundrum braneworld
model. A scalar field domain-wall forms the brane, inducing warped gravity, and
we study the mass spectra of the matter fields in the dimensionally reduced
theory. We demonstrate explicitly that both scalar and fermion fields exhibit a
continuum of properly normalisable modes starting at zero mass. If discrete
bound modes are present in the gravity-free case, these become resonances in
the continuum, while off-resonant modes are highly suppressed on the brane. We
describe briefly how another scalar field can be used to break a symmetry on
the domain-wall while leaving it unbroken far from the wall, as has already
been done in the flat space case. Finally we present numerical calculations for
a toy model which demonstrates the decoupling of continuum modes at low
energies, so the theory becomes four dimensional.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 05:54:32 GMT"
},
{
"version": "v2",
"created": "Tue, 15 May 2007 02:58:49 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Jun 2007 01:17:08 GMT"
},
{
"version": "v4",
"created": "Tue, 25 Sep 2007 04:18:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Davies",
"Rhys",
""
],
[
"George",
"Damien P.",
""
]
] |
0705.1392 | Nurulla Azamov | N.A. Azamov, A.L. Carey, F.A. Sukochev | The spectral shift function and spectral flow | 47 pages | null | 10.1007/s00220-007-0329-9 | null | math.FA math.SP | null | This paper extends Krein's spectral shift function theory to the setting of
semifinite spectral triples. We define the spectral shift function under these
hypotheses via Birman-Solomyak spectral averaging formula and show that it
computes spectral flow.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 06:12:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Azamov",
"N. A.",
""
],
[
"Carey",
"A. L.",
""
],
[
"Sukochev",
"F. A.",
""
]
] |
0705.1393 | Afaq Ahmad | A. Afaq | Photodetachment of H$^{-}$ near a partial reflecting surface | 8 pages, 4 figures | null | 10.1088/0256-307X/25/2/034 | null | quant-ph | null | Theoretical and interpretative study on the subject of photodetachment of
H$^{-}$ near a partial reflecting surface is presented, and the absorption
effect of the surface is investigated on the total and differential cross
sections using a theoretical imaging method. To understand the absorption
effect, a reflection parameter $K$ is introduced as a multiplicative factor to
the outgoing detached-electron wave of H$^-$ propagating toward the wall. The
reflection parameter measures, how much electron wave would reflect from the
surface; K=0 corresponds to no reflection and K=1 corresponds to the total
reflection.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 06:21:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Afaq",
"A.",
""
]
] |
0705.1394 | Damien Chablat | Anatoly Pashkevich (Robotic Laboratory), Damien Chablat (IRCCyN),
Philippe Wenger (IRCCyN) | The Orthoglide: Kinematics and Workspace Analysis | null | 9th International Symposium on Advances in Robot Kinematics (2004)
1-10 | null | null | cs.RO | null | The paper addresses kinematic and geometrical aspects of the Orthoglide, a
three-DOF parallel mechanism. This machine consists of three fixed linear
joints, which are mounted orthogonally, three identical legs and a mobile
platform, which moves in the Cartesian x-y-z space with fixed orientation. New
solutions to solve inverse/direct kinematics are proposed and a detailed
workspace analysis is performed taking into account specific joint limit
constraints.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 06:53:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Pashkevich",
"Anatoly",
"",
"Robotic Laboratory"
],
[
"Chablat",
"Damien",
"",
"IRCCyN"
],
[
"Wenger",
"Philippe",
"",
"IRCCyN"
]
] |
0705.1395 | Damien Chablat | Jean-Fran\c{c}ois Petiot (IRCCyN), Damien Chablat (IRCCyN) | Subjective Evaluation of Forms in an Immersive Environment | null | Virtual Concept (2003) 1-6 | null | null | cs.HC cs.RO | null | User's perception of product, by essence subjective, is a major topic in
marketing and industrial design. Many methods, based on users' tests, are used
so as to characterise this perception. We are interested in three main methods:
multidimensional scaling, semantic differential method, and preference mapping.
These methods are used to built a perceptual space, in order to position the
new product, to specify requirements by the study of user's preferences, to
evaluate some product attributes, related in particular to style (aesthetic).
These early stages of the design are primordial for a good orientation of the
project. In parallel, virtual reality tools and interfaces are more and more
efficient for suggesting to the user complex feelings, and creating in this way
various levels of perceptions. In this article, we present on an example the
use of multidimensional scaling, semantic differential method and preference
mapping for the subjective assessment of virtual products. These products,
which geometrical form is variable, are defined with a CAD model and are
proposed to the user with a spacemouse and stereoscopic glasses. Advantages and
limitations of such evaluation is next discussed..
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 06:54:11 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Petiot",
"Jean-François",
"",
"IRCCyN"
],
[
"Chablat",
"Damien",
"",
"IRCCyN"
]
] |
0705.1396 | Xian-Hui Ge | Xian-Hui Ge, Sung-Won Kim | Black hole analogues in braneworld scenario | 12 pages, no figures, Version 2, some references added | null | null | null | hep-th gr-qc hep-ph | null | We construct analogue black hole solutions in the braneworld scenario. The
quantum fluctuations of condensate gravitons propagating around a
$4+n$-dimensional gravitational potential are found yielding a metric similar
to higher dimensional Schwarzschild black hole line-element. Black hole
analogue solutions in Randall-Sundrum and Dvali-Gabadadze-Porrati brane world
models are also constructed. The properties of such black hole analogues are
discussed.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 06:54:26 GMT"
},
{
"version": "v2",
"created": "Tue, 15 May 2007 01:04:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ge",
"Xian-Hui",
""
],
[
"Kim",
"Sung-Won",
""
]
] |
0705.1397 | Damien Chablat | Damien Chablat (IRCCyN), Fouad Bennis (IRCCyN) | Realistic Rendering of Kinetostatic Indices of Mechanisms | null | Virtual Concept (2003) 1-8 | null | null | cs.RO | null | The work presented in this paper is related to the use of a haptic device in
an environment of robotic simulation. Such device introduces a new approach to
feel and to understand the boundaries of the workspace of mechanisms as well as
its kinetostatic properties. Indeed, these concepts are abstract and thus often
difficult to understand for the end-users. To catch his attention, we propose
to amplify the problems of the mechanisms in order to help him to take the good
decisions.
| [
{
"version": "v1",
"created": "Thu, 10 May 2007 06:56:25 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chablat",
"Damien",
"",
"IRCCyN"
],
[
"Bennis",
"Fouad",
"",
"IRCCyN"
]
] |
Subsets and Splits
No saved queries yet
Save your SQL queries to embed, download, and access them later. Queries will appear here once saved.