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| versions
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timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0704.3301 | Alexander Vikman | Eugeny Babichev, Viatcheslav Mukhanov, Alexander Vikman | Looking beyond the horizon | To appear in the proceedings of 11th Marcel Grossmann Meeting on
Recent Developments in Theoretical and Experimental General Relativity,
Gravitation, and Relativistic Field Theories, Berlin, Germany, 23-29 Jul 2006 | null | 10.1142/9789812834300_0171 | LMU-ASC 27/07 | hep-th astro-ph gr-qc | null | In this short talk we review our results from the paper hep-th/0604075 with
the main stress on the issues of causality and acoustic metric in eikonal
approximation. In addition we correct the formula for the redshift of sound
signals from our original work. We show that, if there exists a special kind of
Born-Infeld type scalar field, then one can send information from inside a
black hole. This information is encoded in perturbations of the field
propagating in non-trivial scalar field backgrounds, which serve as a "new
ether". Although the action of the theory is manifestly Lorentz-invariant the
non-trivial solutions break this symmetry spontaneously, allowing, the
superluminal propagation of perturbations with respect to this "new ether". We
found the stationary solution for background, which describes the accretion of
the scalar field onto a black hole. Examining the propagation of small
perturbations around this solution we show that the signals emitted inside the
Schwarzschild horizon can reach an observer located outside the black hole.
Thus the accreting field forms a hydrodynamical analog of a black hole whose
horizon is inside of the gravitational black hole drawing in the scalar field.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 16:29:51 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Babichev",
"Eugeny",
""
],
[
"Mukhanov",
"Viatcheslav",
""
],
[
"Vikman",
"Alexander",
""
]
] |
0704.3302 | Vitali Nesterenko | E.B. Herbold, V.F. Nesterenko | Solitary and shock waves in discrete double power-law materials | 14 pages, 6 figures | null | 10.1063/1.2751592 | null | cond-mat.soft cond-mat.mtrl-sci | null | A novel strongly nonlinear laminar metamaterial supporting new types of
solitary and shock waves with impact energy mitigating capabilities is
presented. It consists of steel plates with intermittent polymer toroidal rings
acting as strongly nonlinear springs with large allowable strain. Their
force-displacement relationship is described by the addition of two power-law
relationships resulting in a solitary wave speed and width depending on the
amplitude. This double nonlinearity allows splitting of an initial impulse into
two separate strongly nonlinear solitary wave trains. Solitary and shock waves
are observed experimentally and analyzed numerically in an assembly with Teflon
o-rings.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 03:08:03 GMT"
},
{
"version": "v2",
"created": "Fri, 24 Aug 2007 22:49:15 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Herbold",
"E. B.",
""
],
[
"Nesterenko",
"V. F.",
""
]
] |
0704.3303 | Gang Bao | Gang Bao, D N A Shaul, H M Araujo, Wei-Tou Ni, T J Sumner and Lei Liu | ASTROD I Charging Simulation and Disturbances | 17 pages, 11 figures, submitted to General Relativity and Gravitation | null | null | null | astro-ph | null | ASTROD I is planned as a single spacecraft mission. It will use
interferometric and pulse ranging techniques between the spacecraft and ground
stations, to make high precision measurements of the parameters that describe
the solar system, and to test relativistic gravity with improved accuracy. At
the heart of the spacecraft is a test mass, which the spacecraft will follow
using a drag-free control system. The mission critically depends on maintaining
the geodesic motion of the test mass. Charging of the test mass due to cosmic
rays and solar particles will disturb its geodesic motion. We have modelled the
charging process using the GEANT4 toolkit and a simplified, geometrical model
and estimate that the ASTROD I test mass will charge positively, at a rate of
24 +/-7 e+/s, due to cosmic ray protons and alpha particles (3He and 4He) at
solar minimum. We have used the results of this simulation to estimate the
magnitude of disturbances associated with test mass charging, for the
worst-case scenario, taking into account uncertainties in the model and
potential charging contributions from minor cosmic-ray components.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 03:08:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bao",
"Gang",
""
],
[
"Shaul",
"D N A",
""
],
[
"Araujo",
"H M",
""
],
[
"Ni",
"Wei-Tou",
""
],
[
"Sumner",
"T J",
""
],
[
"Liu",
"Lei",
""
]
] |
0704.3304 | S. Satheesh | S Satheesh and E Sandhya | On the Marginal Distributions of Stationary AR(1) Sequences | 4 pages, in .pdf format, submitted | null | null | null | math.PR math.ST stat.TH | null | In this note we correct an omission in our paper (Satheesh and Sandhya, 2005)
in defining semi-selfdecomposable laws and also show with examples that the
marginal distributions of a stationary AR(1) process need not even be
infinitely divisible.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 03:28:39 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Satheesh",
"S",
""
],
[
"Sandhya",
"E",
""
]
] |
0704.3305 | Ping Zhang | Zhigang Wang, Ping Zhang | Orbital magnetization and its effects in spin-chiral ferromagnetic
Kagome lattice | 9 pages, 7 figures | null | 10.1103/PhysRevB.76.064406 | null | cond-mat.mes-hall cond-mat.str-el | null | Recently, Berry phase in the semiclassical dynamical of Bloch electrons has
been found to make a correction to the phase-space density of states and a
general multi-band formula for finite-temperature orbital magnetization has
been given [Phys. Rev. Lett. \textbf{97}, 026603 (2006)], where the orbital
magnetization $\mathcal{M}$ consists of two parts, i.e., the conventional part
$M_{c}$ and the Berry-phase correction part $M_{\Omega}$. Using this general
formula, we theoretically investigate the orbital magnetization and its effects
on thermoelectric transport and magnetic susceptibility properties of the
two-dimensional \textit{kagom\'{e}} lattice with spin anisotropies included.
The study in this paper is highly interesting by the occurrence of nonzero
Chern number in the lattice. The spin chirality parameter $\phi$ (see text)
results in profound effects on the orbital magnetization properties. It is
found that the two parts in orbital magnetization opposite each other. In
particular, we show that $M_{c}$ and $M_{\Omega}$ yield the paramagnetic and
diamagnetic responses, respectively. It is further shown that the orbital
magnetization displays fully different behavior in the metallic and insulating
regions, which is due to the different roles $M_{c}$ and $M_{\Omega}$ play in
these two regions. The anomalous Nernst conductivity is also calculated, which
displays a peak-valley structure as a function of the electron Fermi energy.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 03:34:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wang",
"Zhigang",
""
],
[
"Zhang",
"Ping",
""
]
] |
0704.3306 | Alexey A. Kryukov | Alexey A. Kryukov | Quantum mechanics on Hilbert manifolds: The principle of functional
relativity | 45 pages, 9 figures, see arXiv:0704.3225v1 for mathematical
considerations and http://www.uwc.edu/dept/math/faculty/kryukov/ for related
papers | Found. Phys. 36, 175 (2006) | 10.1007/s10701-005-9012-1 | null | quant-ph math-ph math.MP | null | Quantum mechanics is formulated as a geometric theory on a Hilbert manifold.
Images of charts on the manifold are allowed to belong to arbitrary Hilbert
spaces of functions including spaces of generalized functions. Tensor equations
in this setting, also called functional tensor equations, describe families of
functional equations on various Hilbert spaces of functions. The principle of
functional relativity is introduced which states that quantum theory is indeed
a functional tensor theory, i.e., it can be described by functional tensor
equations. The main equations of quantum theory are shown to be compatible with
the principle of functional relativity. By accepting the principle as a
hypothesis, we then analyze the origin of physical dimensions, provide a
geometric interpretation of Planck's constant, and find a simple interpretation
of the two-slit experiment and the process of measurement.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 04:03:37 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Kryukov",
"Alexey A.",
""
]
] |
0704.3307 | Takaki Muramatsu | Takaki Muramatsu, Taisuke Kanemasa, Ernst Bauer, Mauro Giiovannini,
Tomoko Kagayama, Katsuya Shimizu | Pressure induced magnetic ordering in Yb2Pd2Sn with two quantum critical
points | 4 pages, 4 figures | null | null | null | cond-mat.str-el | null | Pressure induced long range antiferromagnetic order is discovered in Yb2Pd2Sn
by measuring the electrical resistivity under pressure up to 5.0 GPa. Magnetic
ordering is observed above about 1.0 GPa, being the lowest pressure in
Yb-intermetallics showing pressure induced magnetic ordering, Unexpectedly,
ordering disappears above about 4.0 GPa, giving rise to the first observation
of the appearance of two quantum critical points persisting in a broad range of
pressure within a single material.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 04:07:54 GMT"
},
{
"version": "v2",
"created": "Wed, 30 May 2007 10:51:07 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Muramatsu",
"Takaki",
""
],
[
"Kanemasa",
"Taisuke",
""
],
[
"Bauer",
"Ernst",
""
],
[
"Giiovannini",
"Mauro",
""
],
[
"Kagayama",
"Tomoko",
""
],
[
"Shimizu",
"Katsuya",
""
]
] |
0704.3308 | Ilarion Melnikov | Nick Halmagyi, Ilarion V. Melnikov, and Savdeep Sethi | Instantons, Hypermultiplets and the Heterotic String | 52 pages, LaTeX; references, some corrections and clarifications
added to the published version | JHEP0707:086,2007 | 10.1088/1126-6708/2007/07/086 | EFI-07-11 | hep-th | null | Hypermultiplet couplings in type IIA string theory on a Calabi-Yau space can
be quantum corrected by D2-brane instantons wrapping special Lagrangian cycles.
On the other hand, hypermultiplet couplings in the heterotic string on a K3
surface are corrected by world-sheet instantons wrapping curves. In a class of
examples, we relate these two sets of instanton corrections. We first present
an analogue of the c-map for the heterotic string via a dual flux
compactification of M-theory. Using this duality, we propose two ways of
capturing quantum corrections to hypermultiplets. We then use the orientifold
limit of certain F-theory compactifications to relate curves in K3 to special
Lagrangians in dual type IIA compactifications. We conclude with some results
from perturbative string theory for hypermultiplet F-terms and a conjecture
about the topology of brane instantons.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 05:09:34 GMT"
},
{
"version": "v2",
"created": "Tue, 8 May 2007 22:29:08 GMT"
},
{
"version": "v3",
"created": "Wed, 1 Aug 2007 16:28:15 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Halmagyi",
"Nick",
""
],
[
"Melnikov",
"Ilarion V.",
""
],
[
"Sethi",
"Savdeep",
""
]
] |
0704.3309 | Y\^usuke Okuyama | David Drasin and Y\^usuke Okuyama | Singularities of Schr\"oder maps and unhyperbolicity of rational
functions | 17 pages; some typos corrected | Comput. Methods Funct. Theory 8 (2008), No. 1, 285--302 | 10.1007/BF03321689 | null | math.CV math.DS | null | We study transcendental singularities of a Schr\"oder map arising from a
rational function $f$, using results from complex dynamics and Nevanlinna
theory. These maps are transcendental meromorphic functions of finite order in
the complex plane. We show that their transcendental singularities lie over the
set where $f$ is not semihyperbolic (unhyperbolic). In addition, if they are
direct, then they lie over only attracting periodic points of $f$, and
moreover, if $f$ is a polynomial, then both direct and indirect singularities
lie over attracting, parabolic and Cremer periodic points of $f$. We also
obtain concrete examples of both kinds of transcendental singularities of
Schr\"oder maps as well as a new proof of the Pommerenke-Levin-Yoccoz
inequality and a new formulation of the Fatou conjecture.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:07:01 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jul 2007 06:45:05 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Sep 2007 03:11:44 GMT"
}
] | 2015-05-21T00:00:00 | [
[
"Drasin",
"David",
""
],
[
"Okuyama",
"Yûsuke",
""
]
] |
0704.3310 | Jihn E. Kim | Jihn E. Kim | PVLAS experiment, star cooling and BBN constraints: Possible
interpretation with temperature dependent gauge symmetry breaking | 9 pages, 3 figues | Phys.Rev.D76:051701,2007 | 10.1103/PhysRevD.76.051701 | SNUTP 07-005 | hep-ph | null | It is known that the kinetic mixing of photon and another U(1)_ex gauge boson
can introduce millicharged particles. Millicharged particles $f$ of mass 0.1 eV
can explain the PVLAS experiment. We suggest a temperature dependent gauge
symmetry breaking of U(1)_ex for this idea to be consistent with astrophysical
and cosmological constraints.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 05:42:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"Jihn E.",
""
]
] |
0704.3311 | Andrey Radzhabov E | A. E. Radzhabov, M. K. Volkov and N. G. Kornakov | rho(omega)-> pi^0 pi^0 gamma, rho(omega) -> eta pi^0 gamma decays in the
local quark Nambu--Jona-Lasinio model | 6 pages, 5 figures | Phys.Atom.Nucl.71:1481-1486,2008 | 10.1134/S1063778808080206 | null | hep-ph | null | The branching ratios and photon spectra of the rare processes rho(omega)->
pi^0 pi^0 gamma, rho(omega) -> eta pi^0 gamma are calculated in the framework
of the standard local quark Nambu--Jona-Lasinio (NJL) model. Three types of
diagrams are considered: the quark box and the pole diagrams with scalar
(sigma,a_0(980)) and vector (rho,omega) mesons. The obtained estimations for
the widths of the processes rho(omega)-> pi^0 pi^0 gamma are in satisfactory
agreement with existing experimental data. Predictions are made for the widths
of the processes rho(omega) -> eta pi^0 gamma.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 06:08:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Radzhabov",
"A. E.",
""
],
[
"Volkov",
"M. K.",
""
],
[
"Kornakov",
"N. G.",
""
]
] |
0704.3312 | Yohan Payan | Nicolas Vuillerme (TIMC - IMAG), Olivier Chenu (TIMC - IMAG),
Alexandre Moreau-Gaudry (TIMC - IMAG), Jacques Demongeot (TIMC - IMAG), Yohan
Payan (TIMC - IMAG) | Artificial Tongue-Placed Tactile Biofeedback for perceptual
supplementation: application to human disability and biomedical engineering | null | Human Machine iNteraction Conference Human'07 (2007) 105-112 | null | null | physics.med-ph q-bio.NC | null | The present paper aims at introducing the innovative technologies, based on
the concept of "sensory substitution" or "perceptual supplementation", we are
developing in the fields of human disability and biomedical engineering.
Precisely, our goal is to design, develop and validate practical assistive
biomedical and/technical devices and/or rehabilitating procedures for persons
with disabilities, using artificial tongue-placed tactile biofeedback systems.
Proposed applications are dealing with: (1) pressure sores prevention in case
of spinal cord injuries (persons with paraplegia, or tetraplegia); (2) ankle
proprioceptive acuity improvement for driving assistance in older and/or
disabled adults; and (3) balance control improvement to prevent fall in older
and/or disabled adults. This paper presents results of three feasibility
studies performed on young healthy adults.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 06:56:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Vuillerme",
"Nicolas",
"",
"TIMC - IMAG"
],
[
"Chenu",
"Olivier",
"",
"TIMC - IMAG"
],
[
"Moreau-Gaudry",
"Alexandre",
"",
"TIMC - IMAG"
],
[
"Demongeot",
"Jacques",
"",
"TIMC - IMAG"
],
[
"Payan",
"Yohan",
"",
"TIMC - IMAG"
]
] |
0704.3313 | David Eppstein | David Eppstein and Michael T. Goodrich | Straggler Identification in Round-Trip Data Streams via Newton's
Identities and Invertible Bloom Filters | Fuller version of paper appearing in 10th Worksh. Algorithms and Data
Structures, Halifax, Nova Scotia, 2007 | null | null | null | cs.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the straggler identification problem, in which an algorithm must
determine the identities of the remaining members of a set after it has had a
large number of insertion and deletion operations performed on it, and now has
relatively few remaining members. The goal is to do this in o(n) space, where n
is the total number of identities. The straggler identification problem has
applications, for example, in determining the set of unacknowledged packets in
a high-bandwidth multicast data stream. We provide a deterministic solution to
the straggler identification problem that uses only O(d log n) bits and is
based on a novel application of Newton's identities for symmetric polynomials.
This solution can identify any subset of d stragglers from a set of n O(log
n)-bit identifiers, assuming that there are no false deletions of identities
not already in the set. Indeed, we give a lower bound argument that shows that
any small-space deterministic solution to the straggler identification problem
cannot be guaranteed to handle false deletions. Nevertheless, we show that
there is a simple randomized solution using O(d log n log(1/epsilon)) bits that
can maintain a multiset and solve the straggler identification problem,
tolerating false deletions, where epsilon>0 is a user-defined parameter
bounding the probability of an incorrect response. This randomized solution is
based on a new type of Bloom filter, which we call the invertible Bloom filter.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 06:59:43 GMT"
},
{
"version": "v2",
"created": "Fri, 18 May 2007 21:56:45 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Sep 2009 04:13:31 GMT"
}
] | 2009-09-10T00:00:00 | [
[
"Eppstein",
"David",
""
],
[
"Goodrich",
"Michael T.",
""
]
] |
0704.3314 | Jaewoo Lee | Jaewoo Lee | Geometric structure of sumsets | 7 pages | null | null | null | math.NT math.CO | null | Given a finite set of lattice points, we compare its sumsets and lattice
points in its dilated convex hulls. Both of these are known to grow as
polynomials. Generally, the former are subsets of the latter. In this paper, we
will see that sumsets occupy all the central lattice points in convex hulls,
giving us a kind of approximation to lattice points in polytopes.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 07:22:50 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Lee",
"Jaewoo",
""
]
] |
0704.3315 | Mayumi Sato | Mayumi Sato, Tomoya Hirota, Mareki Honma, Hideyuki Kobayashi, Tetsuo
Sasao, Takeshi Bushimata, Yoon Kyung Choi, Hiroshi Imai, Kenzaburo Iwadate,
Takaaki Jike, Seiji Kameno, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-ya,
Noriyuki Kawaguchi, Masachika Kijima, Mi Kyoung Kim, Seisuke Kuji, Tomoharu
Kurayama, Seiji Manabe, Kenta Maruyama, Makoto Matsui, Naoko Matsumoto,
Takeshi Miyaji, Takumi Nagayama, Akiharu Nakagawa, Kayoko Nakamura, Chung Sik
Oh, Toshihiro Omodaka, Tomoaki Oyama, Satoshi Sakai, Katsuhisa Sato,
Katsunori M. Shibata, Motonobu Shintani, Yoshiaki Tamura, Miyuki Tsushima,
and Kazuyoshi Yamashita | Absolute Proper Motions of H2O Masers Away from the Galactic Plane
Measured with VERA in the "Superbubble" Region NGC 281 | 10 pages, 5 figures, PASJ in press (Vol. 59, No. 4; August 25, 2007
issue) | null | 10.1093/pasj/59.4.743 | null | astro-ph | null | We report on absolute proper-motion measurements of an H2O maser source in
the NGC 281 West molecular cloud, which is located ~320 pc above the Galactic
plane and is associated with an HI loop extending from the Galactic plane. We
have conducted multi-epoch phase-referencing observations of the maser source
with VERA (VLBI Exploration of Radio Astrometry) over a monitoring period of 6
months since May 2006. We find that the H2O maser features in NGC 281 West are
systematically moving toward the southwest and further away from the Galactic
plane with a vertical velocity of ~20-30 km/s at its estimated distance of
2.2-3.5 kpc. Our new results provide the most direct evidence that the gas in
the NGC 281 region on the HI loop was blown out from the Galactic plane, most
likely in a superbubble driven by multiple or sequential supernova explosions
in the Galactic plane.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 07:21:08 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Sato",
"Mayumi",
""
],
[
"Hirota",
"Tomoya",
""
],
[
"Honma",
"Mareki",
""
],
[
"Kobayashi",
"Hideyuki",
""
],
[
"Sasao",
"Tetsuo",
""
],
[
"Bushimata",
"Takeshi",
""
],
[
"Choi",
"Yoon Kyung",
""
],
[
"Imai",
"Hiroshi",
""
],
[
"Iwadate",
"Kenzaburo",
""
],
[
"Jike",
"Takaaki",
""
],
[
"Kameno",
"Seiji",
""
],
[
"Kameya",
"Osamu",
""
],
[
"Kamohara",
"Ryuichi",
""
],
[
"Kan-ya",
"Yukitoshi",
""
],
[
"Kawaguchi",
"Noriyuki",
""
],
[
"Kijima",
"Masachika",
""
],
[
"Kim",
"Mi Kyoung",
""
],
[
"Kuji",
"Seisuke",
""
],
[
"Kurayama",
"Tomoharu",
""
],
[
"Manabe",
"Seiji",
""
],
[
"Maruyama",
"Kenta",
""
],
[
"Matsui",
"Makoto",
""
],
[
"Matsumoto",
"Naoko",
""
],
[
"Miyaji",
"Takeshi",
""
],
[
"Nagayama",
"Takumi",
""
],
[
"Nakagawa",
"Akiharu",
""
],
[
"Nakamura",
"Kayoko",
""
],
[
"Oh",
"Chung Sik",
""
],
[
"Omodaka",
"Toshihiro",
""
],
[
"Oyama",
"Tomoaki",
""
],
[
"Sakai",
"Satoshi",
""
],
[
"Sato",
"Katsuhisa",
""
],
[
"Shibata",
"Katsunori M.",
""
],
[
"Shintani",
"Motonobu",
""
],
[
"Tamura",
"Yoshiaki",
""
],
[
"Tsushima",
"Miyuki",
""
],
[
"Yamashita",
"Kazuyoshi",
""
]
] |
0704.3316 | Ciro Cattuto | Ciro Cattuto, Andrea Baldassarri, Vito D. P. Servedio, Vittorio Loreto | Vocabulary growth in collaborative tagging systems | 6 pages, 7 figures | null | null | null | cs.IR cond-mat.stat-mech cs.CY physics.data-an | null | We analyze a large-scale snapshot of del.icio.us and investigate how the
number of different tags in the system grows as a function of a suitably
defined notion of time. We study the temporal evolution of the global
vocabulary size, i.e. the number of distinct tags in the entire system, as well
as the evolution of local vocabularies, that is the growth of the number of
distinct tags used in the context of a given resource or user. In both cases,
we find power-law behaviors with exponents smaller than one. Surprisingly, the
observed growth behaviors are remarkably regular throughout the entire history
of the system and across very different resources being bookmarked. Similar
sub-linear laws of growth have been observed in written text, and this
qualitative universality calls for an explanation and points in the direction
of non-trivial cognitive processes in the complex interaction patterns
characterizing collaborative tagging.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 07:47:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Cattuto",
"Ciro",
""
],
[
"Baldassarri",
"Andrea",
""
],
[
"Servedio",
"Vito D. P.",
""
],
[
"Loreto",
"Vittorio",
""
]
] |
0704.3317 | Titus S. van Erp | Titus S. van Erp | Reaction rate calculation by parallel path swapping | 5 pages, 3 figures | null | 10.1103/PhysRevLett.98.268301 | null | cond-mat.stat-mech | null | The efficiency of path sampling simulations can be improved considerably
using the approach of path swapping. For this purpose, we have devised a new
algorithmic procedure based on the transition interface sampling technique. In
the same spirit of parallel tempering, paths between different ensembles are
swapped, but the role of temperature is here played by the interface position.
We have tested the method on the denaturation transition of DNA using the
Peyrard-Bishop-Dauxois model. We find that the new algorithm gives a reduction
of the computational cost by a factor 20.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:02:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"van Erp",
"Titus S.",
""
]
] |
0704.3318 | Andrieux David | D. Andrieux and P. Gaspard | A fluctuation theorem for currents and non-linear response coefficients | null | J. Stat. Mech. P02006 (2007) | 10.1088/1742-5468/2007/02/P02006 | null | cond-mat.stat-mech | null | We use a recently proved fluctuation theorem for the currents to develop the
response theory of nonequilibrium phenomena. In this framework, expressions for
the response coefficients of the currents at arbitrary orders in the
thermodynamic forces or affinities are obtained in terms of the fluctuations of
the cumulative currents and remarkable relations are obtained which are the
consequences of microreversibility beyond Onsager reciprocity relations.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:09:31 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Andrieux",
"D.",
""
],
[
"Gaspard",
"P.",
""
]
] |
0704.3319 | Oleg Misochko | O V Misochko, M V Lebedev, H Schaefer and T Dekorsy | Experimental study of the coherent A1 phonons in Te with tailored
femtosecond pulses | submitted to New Journal of Physics | JOURNAL OF PHYSICS-CONDENSED MATTER Volume: 19 Issue: 15 Article
Number: 156227 Published: APR 18 2007 | null | null | cond-mat.mtrl-sci | null | We tailor the shape and phase of the pump pulse spectrum in order to study
the coherent lattice dynamics in tellurium. Employing the coherent control via
splitting the pump pulse into a two-pulse sequence, we show that the
oscillations due to A1 coherent phonons can be cancelled but not enhanced as
compared to single pulse excitation. We further demonstrate that a decisive
factor for the coherent phonon generation is the bandwidth of the pulse
spectrum and not the steepness of the pulse envelope. We also observe that the
coherent amplitude for long pump pulses decreases exponentially independent of
the shape of the pulse spectrum. Finally, by varying the pulse chirp, we show
that the coherent amplitude is independent of while the oscillation lifetime is
dependent on the chirp sign.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:15:42 GMT"
}
] | 2010-11-10T00:00:00 | [
[
"Misochko",
"O V",
""
],
[
"Lebedev",
"M V",
""
],
[
"Schaefer",
"H",
""
],
[
"Dekorsy",
"T",
""
]
] |
0704.3320 | Makoto C. Fujiwara | M.C. Fujiwara (TRIUMF), G. Andresen, W. Bertsche, A. Boston, P. D.
Bowe, C. L. Cesar, S. Chapman, M. Charlton, M. Chartier, A. Deutsch, J.
Fajans, R. Funakoshi, D.R. Gill, K. Gomberoff, J.S. Hangst, W.N. Hardy, R.S.
Hayano, R. Hydomako, M.J. Jenkins, L.V. Jorgensen, L. Kurchaninov, N. Madsen,
P. Nolan, K. Olchanski, A. Olin, R.D. Page, A. Povilus, F. Robicheaux, E.
Sarid, D.M. Silveira, J.W. Storey, R.I. Thompson, D.P. van der Werf, J.S.
Wurtele, Y. Yamazaki | Towards Antihydrogen Confinement with the ALPHA Antihydrogen Trap | Invited talk at International Conference on Trapped Charged Particles
and Fundamental Physics: TCP06, Parksville, BC, Canada, September 2006. To be
published in Hyperfine Interactions | null | 10.1007/s10751-007-9527-2 | TRI-PP-07-03 | nucl-ex hep-ex physics.atom-ph physics.plasm-ph | null | ALPHA is an international project that has recently begun experimentation at
CERN's Antiproton Decelerator (AD) facility. The primary goal of ALPHA is
stable trapping of cold antihydrogen atoms with the ultimate goal of precise
spectroscopic comparisons with hydrogen. We discuss the status of the ALPHA
project and the prospects for antihydrogen trapping.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:26:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Fujiwara",
"M. C.",
"",
"TRIUMF"
],
[
"Andresen",
"G.",
""
],
[
"Bertsche",
"W.",
""
],
[
"Boston",
"A.",
""
],
[
"Bowe",
"P. D.",
""
],
[
"Cesar",
"C. L.",
""
],
[
"Chapman",
"S.",
""
],
[
"Charlton",
"M.",
""
],
[
"Chartier",
"M.",
""
],
[
"Deutsch",
"A.",
""
],
[
"Fajans",
"J.",
""
],
[
"Funakoshi",
"R.",
""
],
[
"Gill",
"D. R.",
""
],
[
"Gomberoff",
"K.",
""
],
[
"Hangst",
"J. S.",
""
],
[
"Hardy",
"W. N.",
""
],
[
"Hayano",
"R. S.",
""
],
[
"Hydomako",
"R.",
""
],
[
"Jenkins",
"M. J.",
""
],
[
"Jorgensen",
"L. V.",
""
],
[
"Kurchaninov",
"L.",
""
],
[
"Madsen",
"N.",
""
],
[
"Nolan",
"P.",
""
],
[
"Olchanski",
"K.",
""
],
[
"Olin",
"A.",
""
],
[
"Page",
"R. D.",
""
],
[
"Povilus",
"A.",
""
],
[
"Robicheaux",
"F.",
""
],
[
"Sarid",
"E.",
""
],
[
"Silveira",
"D. M.",
""
],
[
"Storey",
"J. W.",
""
],
[
"Thompson",
"R. I.",
""
],
[
"van der Werf",
"D. P.",
""
],
[
"Wurtele",
"J. S.",
""
],
[
"Yamazaki",
"Y.",
""
]
] |
0704.3321 | Chikara Furusawa | Chikara Furusawa and Kunihiko Kaneko | A generic mechanism for adaptive growth rate regulation | 14 pages, 5 figures, submitted to PLoS Computational Biology | null | 10.1371/journal.pcbi.0040003 | null | q-bio.MN | null | How can a microorganism adapt to a variety of environmental conditions
despite there exists a limited number of signal transduction machineries? We
show that for any growing cells whose gene expression is under stochastic
fluctuations, adaptive cellular state is inevitably selected by noise, even
without specific signal transduction network for it. In general, changes in
protein concentration in a cell are given by its synthesis minus dilution and
degradation, both of which are proportional to the rate of cell growth. In an
adaptive state with a higher growth speed, both terms are large and balanced.
Under the presence of noise in gene expression, the adaptive state is less
affected by stochasticity since both the synthesis and dilution terms are
large, while for a non-adaptive state both the terms are smaller so that cells
are easily kicked out of the original state by noise. Hence, escape time from a
cellular state and the cellular growth rate are negatively correlated. This
leads to a selection of adaptive states with higher growth rates, and model
simulations confirm this selection to take place in general. The results
suggest a general form of adaptation that has never been brought to light - a
process that requires no specific machineries for sensory adaptation. The
present scheme may help explain a wide range of cellular adaptive responses
including the metabolic flux optimization for maximal cell growth.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:33:28 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Furusawa",
"Chikara",
""
],
[
"Kaneko",
"Kunihiko",
""
]
] |
0704.3322 | Dr. Banasri Basu | B. Basu and P. Bandyopadhyay | A Geometrical Approach towards Entanglement | 7 pages, accepted in IJGMMP Vol 4, No. 5 (2007) | null | 10.1142/S0219887807002247 | null | quant-ph | null | We have studied the concurrence of two-site entanglement and have shown that
it is related to the geometric phase accumulated due to a complete rotation of
the entangled state. The geometric phase and hence the concurrence is evaluated
for transverse Ising model and antiferromagnetic chain which is found to be in
good agreement with that obtained by other methods.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:35:26 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Basu",
"B.",
""
],
[
"Bandyopadhyay",
"P.",
""
]
] |
0704.3323 | Susumu Yamamoto | S. Yamamoto, T. Fujiwara and Y. Hatsugai | Charge and spin stripe in La$_{2-x}$Sr$_{x}$NiO$_{4}$ (x=1/3,1/2) | 12 pages, 10 figures, fully revised | Phys. Rev. B 76, 165114 (2007) | 10.1103/PhysRevB.76.165114 | null | cond-mat.str-el | null | Electronic structure of stripe ordered La$_{2-x}$Sr$_{x}$NiO$_{4}$ is
investigated. The system with x=1/3 is insulator, in LSDA+U calculations, and
shows charge and spin stripe, consistent with the experimental results. Highly
correlated system of x=1/2 is studied by using exact diagonalization of
multi-orbital many body Hamiltonian derived from LDA calculations and including
on-site and inter-site Coulomb interactions. The fluctuation of the residual
spin on Ni$^{3+}$ (hole) site couples with the charge fluctuation between
Ni$^{3+}$ and Ni$^{2+}$ states and this correlation lowers the total energy.
The resultant ground state is insulator with charge and spin stripe of the
energy gap 0.9eV, consistent with observed one. The on-site Coulomb interaction
stabilizes integral valency of each Ni ion (Ni$^{3+}$ and Ni$^{2+}$), but does
not induce the charge order. Two quantities, inter-site Coulomb interaction and
anisotropy of hopping integrals, play an important role to form the charge and
spin stripe order in a system of x=1/2.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:35:59 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Sep 2007 07:11:08 GMT"
}
] | 2007-12-06T00:00:00 | [
[
"Yamamoto",
"S.",
""
],
[
"Fujiwara",
"T.",
""
],
[
"Hatsugai",
"Y.",
""
]
] |
0704.3324 | Anders Eriksson | Anders Eriksson, Martin Nilsson Jacobi, Johan Nystr\"om, Kolbj{\o}rn
Tunstr{\o}m | Using force covariance to derive effective stochastic interactions in
dissipative particle dynamics | 10 pages, 10 figures | PHYSICAL REVIEW E 77, 016707 (2008) | 10.1103/PhysRevE.77.016707 | null | cond-mat.soft | null | There exist methods for determining effective conservative interactions in
coarse grained particle based mesoscopic simulations. The resulting models can
be used to capture thermal equilibrium behavior, but in the model system we
study do not correctly represent transport properties. In this article we
suggest the use of force covariance to determine the full functional form of
dissipative and stochastic interactions. We show that a combination of the
radial distribution function and a force covariance function can be used to
determine all interactions in dissipative particle dynamics. Furthermore we use
the method to test if the effective interactions in dissipative particle
dynamics (DPD) can be adjusted to produce a force covariance consistent with a
projection of a microscopic Lennard-Jones simulation. The results indicate that
the DPD ansatz may not be consistent with the underlying microscopic dynamics.
We discuss how this result relates to theoretical studies reported in the
literature.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:59:53 GMT"
},
{
"version": "v2",
"created": "Sat, 28 Apr 2007 21:46:53 GMT"
},
{
"version": "v3",
"created": "Tue, 1 May 2007 07:57:01 GMT"
},
{
"version": "v4",
"created": "Fri, 12 Oct 2007 14:50:02 GMT"
},
{
"version": "v5",
"created": "Mon, 3 Dec 2007 14:39:51 GMT"
}
] | 2016-03-28T00:00:00 | [
[
"Eriksson",
"Anders",
""
],
[
"Jacobi",
"Martin Nilsson",
""
],
[
"Nyström",
"Johan",
""
],
[
"Tunstrøm",
"Kolbjørn",
""
]
] |
0704.3325 | Vu Hung Dao | L.F. Chibotaru, V.H. Dao, A. Ceulemans | Thermodynamically stable noncomposite vortices in mesoscopic two-gap
superconductors | 5 pages, 3 figures, to be published in Europhysics Letters | null | 10.1209/0295-5075/78/47001 | null | cond-mat.supr-con cond-mat.mes-hall | null | In mesoscopic two-gap superconductors with sizes of the order of the
coherence length noncomposite vortices are found to be thermodynamically stable
in a large domain of the $T - H$ phase diagram. In these phases the vortex
cores of one condensate are spatially separated from the other condensate ones,
and their respective distributions can adopt distinct symmetries. The
appearance of these vortex phases is caused by a non-negligible effect of the
boundary of the sample on the superconducting order parameter and represents
therefore a genuine mesoscopic effect. For low values of interband Josephson
coupling vortex patterns with $L_1 \neq L_2$ can arise in addition to the
phases with $L_1 =L_2$, where $L_1$ and $L_2$ are total vorticities in the two
condensates. The calculations show that noncomposite vortices could be observed
in thin mesoscopic samples of MgB$_{2}$.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:38:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chibotaru",
"L. F.",
""
],
[
"Dao",
"V. H.",
""
],
[
"Ceulemans",
"A.",
""
]
] |
0704.3326 | Ralf Hofmann | Dariush Kaviani and Ralf Hofmann | Irreducible three-loop contributions to the pressure in Yang-Mills
thermodynamics | 10 pages, 3 figures | Mod.Phys.Lett.A22:2343-2352,2007 | 10.1142/S0217732307024413 | KA-TP-11-2007 | hep-th | null | In the effective theory for the deconfining phase of SU(2) Yang-Mills
thermodynamics we compute estimates for the moduli of the irreducible
three-loop diagrams contributing to the pressure. Our numerical results are in
agreement with general expectations.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:57:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kaviani",
"Dariush",
""
],
[
"Hofmann",
"Ralf",
""
]
] |
0704.3327 | Shihoko Ishii | Shihoko Ishii | Jet schemes, arc spaces and the Nash problem | 21 pages, to appear in the Mathematical Reports of the Academy of
Science of the Royal Society of Canada (Canadian Comptes Rendus) | null | null | null | math.AG | null | This paper is an introduction to the jet schemes and the arc space of an
algebraic variety. We also introduce the Nash problem on arc families.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:59:13 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ishii",
"Shihoko",
""
]
] |
0704.3328 | Mikito Tanaka | Mikito Tanaka, Masashi Chiba, Yutaka Komiyama, Masanori Iye and
Puragra Guhathakurta | A Subaru/Suprime-Cam Survey of M31's spheroid along the South-East minor
axis | Submitted to ApJL | null | null | null | astro-ph | null | We have used Suprime-Cam on the Subaru Telescope to conduct a V- and I-band
imaging survey of fields sampling the spheroid of the Andromeda galaxy along
its south-east minor axis. Our photometric data are deep enough to resolve
stars down to the red clump. Based on a large and reliable sample of red giant
stars available from this deep wide-field imager, we have derived metallicity
distributions vs. radius and a surface brightness profile over projected
distances of R=23-66 kpc from the galaxy's center. The metallicity
distributions across this region shows a clear high mean metallicity and a
broad distribution ([Fe/H] ~ -0.6 +/- 0.5), and indicates no metallicity
gradient within our observed range. The surface brightness profile at R>40 kpc
is found to be flatter than previously thought. It is conceivable that this
part of the halo samples as yet unidentified, metal-rich substructure.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 08:59:32 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Tanaka",
"Mikito",
""
],
[
"Chiba",
"Masashi",
""
],
[
"Komiyama",
"Yutaka",
""
],
[
"Iye",
"Masanori",
""
],
[
"Guhathakurta",
"Puragra",
""
]
] |
0704.3329 | Cecilia Tarantino | Monika Blanke, Andrzej J. Buras, Stefan Recksiegel, Cecilia Tarantino
and Selma Uhlig | Correlations between epsilon'/epsilon and Rare K Decays in the Littlest
Higgs Model with T-Parity | 21 pages, 4 figures, 3 tables. Note added on the omitted term in
Z-penguin contribution. For an updated analysis see arXiv:0906.5454 | JHEP 0706:082,2007 | 10.1088/1126-6708/2007/06/082 | TUM-HEP-667/07, MPP-2007-43 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the CP-violating ratio epsilon'/epsilon in the Littlest Higgs
model with T-parity (LHT) and investigate its correlations with the branching
ratios for K_L -> pi^0 nu {bar nu}, K_L -> pi^0 l^+ l^- and K^+ -> pi^+ nu {bar
nu}. The resulting correlations are rather strong in the case of K_L decays,
but less pronounced in the case of K^+ -> pi^+ nu {bar nu}. Unfortunately, they
are subject to large hadronic uncertainties present in epsilon'/epsilon, whose
theoretical prediction in the Standard Model (SM) is reviewed and updated here.
With the matrix elements of Q_6 (gluon penguin) and Q_8 (electroweak penguin)
evaluated in the large-N limit and m_s^MS(2 GeV) = 100 MeV from lattice QCD,
(epsilon'/epsilon)_SM turns out to be close to the data so that significant
departures of Br(K_L -> pi^0 nu {bar nu}) and Br(K_L -> pi^0 l^+ l^-) from the
SM expectations are unlikely, while Br(K^+ -> pi^+ nu {bar nu}) can be enhanced
even by a factor 5. On the other hand, modest departures of the relevant
hadronic matrix elements from their large-N values allow for a consistent
description of epsilon'/epsilon within the LHT model accompanied by large
enhancements of Br(K_L -> pi^0 nu {bar nu}) and Br(K_L -> pi^0 l^+ l^-), but
only modest enhancements of Br(K^+ -> pi^+ nu {bar nu}).
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 09:08:33 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 15:44:08 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Jan 2010 17:03:28 GMT"
}
] | 2010-01-15T00:00:00 | [
[
"Blanke",
"Monika",
""
],
[
"Buras",
"Andrzej J.",
""
],
[
"Recksiegel",
"Stefan",
""
],
[
"Tarantino",
"Cecilia",
""
],
[
"Uhlig",
"Selma",
""
]
] |
0704.3330 | Hao Wei | Hao Wei, Shuang Nan Zhang | Interacting Energy Components and Observational $H(z)$ Data | 15 pages, 5 figures, 3 tables, Latex2e; v2: references added; v3:
discussions added, Phys. Lett. B in press; v4: published version | Phys.Lett.B654:139-147,2007 | 10.1016/j.physletb.2007.08.056 | null | astro-ph gr-qc hep-th | null | In this note, we extend our previous work [Phys. Lett. B 644, 7 (2007),
astro-ph/0609597], and compare eleven interacting dark energy models with
different couplings to the observational $H(z)$ data. However, none of these
models is better than the simplest $\Lambda$CDM model. This implies that either
more exotic couplings are needed in the cosmological models with interaction
between dark energy and dust matter, or {\em there is no interaction at all}.
We consider that this result is disadvantageous to the interacting dark energy
models studied extensively in the literature.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:54:44 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Apr 2007 08:00:32 GMT"
},
{
"version": "v3",
"created": "Thu, 23 Aug 2007 09:31:16 GMT"
},
{
"version": "v4",
"created": "Fri, 5 Oct 2007 07:44:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wei",
"Hao",
""
],
[
"Zhang",
"Shuang Nan",
""
]
] |
0704.3331 | Nikos Prantzos | Nikos Prantzos (1), Corinne Charbonnel (2,3) and Christian Iliadis (4)
((1) Institut d'Astrophysique de Paris and Univ. P. et M. Curie, (2) Geneva
Observatory, (3)Laboratoire d'Astrophysique de Toulouse et Tarbes, (4) Dpt.
of Physics and Astronomy, University of North Carolina) | Light nuclei in galactic globular clusters : constraints on the
self-enrichment scenario from nucleosynthesis | 15 pages, 8 figures, accepted in Astronomy and Astrophysics | null | 10.1051/0004-6361:20077205 | null | astro-ph | null | Hydrogen-burning is the root cause of the star-to-star abundance variations
of light nuclei in Galactic globular clusters (GC). In the present work we
constrain the physical conditions that gave rise to the observed abundance
patterns of Li, C, N, O, Na, Mg, Al, as well as Mg isotopes in the typical case
of NGC6752. We perform nucleosynthesis calculations at constant temperature,
adopting realistic initial abundances for the proto-cluster gas. We use a
detailed nuclear reaction network and state-of-the-art nuclear reaction rates.
Although simplistic, our analysis provides original results and new constraints
on the self-enrichment scenario for GCs. Our parametrized calculations allow us
to determine a narrow range of temperature where the observed extreme
abundances of all light elements and isotopes in NGC6752 are nicely reproduced
simultaneously. This agreement is obtained after mixing of the H-processed
material with 30 % of unprocessed gas. The observed C-N, O-Na, Mg-Al, Li-Na and
F-Na anticorrelations, as well as the behaviour of the Mg isotopes can be
recovered by assuming mixing with even larger dilution factors. Li production
by the stars that build up the other abundance anomalies is not mandatory in
the case of NGC 6752. Observations of O, Na, Mg and Al constrain the
temperature range for H-burning; such temperatures are encountered in the two
main candidate ``polluters'' proposed for GCs, namely massive AGBs and the most
massive main-sequence stars. (Abridged).
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 09:25:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Prantzos",
"Nikos",
""
],
[
"Charbonnel",
"Corinne",
""
],
[
"Iliadis",
"Christian",
""
]
] |
0704.3332 | Ludkovsky Sergey Victor | S.V. Ludkovsky | Groups of diffeomorphisms and geometric loops of manifolds over
ultra-normed fields | Some corrections excluding misprints in the article were made | 2012, J. Mathem. Sciences; New York, V. 185: 1 | 10.1007/s10958-012-0904-2 | null | math.GR math.FA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The article is devoted to the investigation of groups of diffeomorphisms and
loops of manifolds over ultra-metric fields of zero and positive
characteristics. Different types of topologies are considered on groups of
loops and diffeomorphisms relative to which they are generalized Lie groups or
topological groups. Among such topologies pairwise incomparable are found as
well. Topological perfectness of the diffeomorphism group relative to certain
topologies is studied. There are proved theorems about projective limit
decompositions of these groups and their compactifications for compact
manifolds. Moreover, an existence of one-parameter local subgroups of
diffeomorphism groups is investigated.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 09:34:24 GMT"
},
{
"version": "v2",
"created": "Sun, 7 Dec 2008 12:12:58 GMT"
}
] | 2018-12-18T00:00:00 | [
[
"Ludkovsky",
"S. V.",
""
]
] |
0704.3333 | Antonio Pulido Paton | Antonio Pulido Paton, Wei-Tou Ni | The Low Frequency Sensitivity to Gravitational Waves for ASTROD | 21 pages, 2 figures. Accepted for publication in General Relativity
and Gravitation | null | null | null | astro-ph | null | ASTROD is a relativity mission concept encompassing multi-purposes. One of
its main purposes is to detect gravitational waves sensitive to low-frequency
band similar to LISA, but shifted to lower frequencies. In this aspect, ASTROD
would complement LISA in probing the Universe and study strong-field black hole
physics. Since ASTROD will be after LISA, in the Cosmic Vision time-frame
2015-2025, a ten-fold improvement over LISA accelerometer noise goal would be
possible, allowing us to test relativistic gravity to 1 ppb and improve the
gravitational-wave sensitivity. In this paper, we address to this possible
improvement, especially in the frequency range below 0.1 mHz. We look into
possible thermal noise improvement, magnetic noise improvement, spurious
discharging noise improvement and local gravitational noise improvement. We
discuss various possibilities of lower-frequency gravitational-wave responses
and their significance to potential astrophysical sources.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 09:36:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Paton",
"Antonio Pulido",
""
],
[
"Ni",
"Wei-Tou",
""
]
] |
0704.3334 | Adrian Tanasa | A. Tanasa (1), A. Ballesteros (2), F. J. Herranz (2) ((1) LPT Orsay,
(2) Univ. Burgos) | Solutions for the constant quantum Yang-Baxter equation from Lie
(super)algebras | 8 pages | J. Geom. Symmetry Phys. 10 (2007) 83-91 | 10.7546/jgsp-10-2007-83-92 | null | math.QA hep-th math-ph math.MP | null | We present a systematic procedure to obtain singular solutions of the
constant quantum Yang-Baxter equation in arbitrary dimension. This approach,
inspired in the Lie (super)algebra structure, is explicitly applied to the
particular case of (graded) contractions of the orthogonal real algebra
${\mathfrak{so}}(N+1)$. In this way we show that "classical" contraction
parameters which appear in the commutation relations of the contracted Lie
algebras, become quantum deformation parameters, arising as entries of the
resulting quantum $R$-matrices.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 09:38:10 GMT"
}
] | 2017-04-17T00:00:00 | [
[
"Tanasa",
"A.",
""
],
[
"Ballesteros",
"A.",
""
],
[
"Herranz",
"F. J.",
""
]
] |
0704.3335 | Mikhail Sheftel | A. A. Malykh (North Western State Technical University, St.
Petersburg, Russia), Y. Nutku (Feza Gursey Institute, Istanbul, Turkey) and
M. B. Sheftel (Bogazici University, Istanbul, Turkey) | Lift of noninvariant solutions of heavenly equations from three to four
dimensions and new ultra-hyperbolic metrics | 24 pages, submitted to J. Phys. A: Math. Theor | null | 10.1088/1751-8113/40/31/014 | null | math-ph math.MP | null | We demonstrate that partner symmetries provide a lift of noninvariant
solutions of three-dimensional Boyer-Finley equation to noninvariant solutions
of four-dimensional hyperbolic complex Monge-Ampere equation. The lift is
applied to noninvariant solutions of the Boyer-Finley equation, obtained
earlier by the method of group foliation, to yield noninvariant solutions of
the hyperbolic complex Monge-Ampere equation. Using these solutions we
construct new Ricci-flat ultra-hyperbolic metrics with non-zero curvature
tensor that have no Killing vectors.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 11:47:17 GMT"
},
{
"version": "v2",
"created": "Sat, 5 May 2007 10:34:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Malykh",
"A. A.",
"",
"North Western State Technical University, St.\n Petersburg, Russia"
],
[
"Nutku",
"Y.",
"",
"Feza Gursey Institute, Istanbul, Turkey"
],
[
"Sheftel",
"M. B.",
"",
"Bogazici University, Istanbul, Turkey"
]
] |
0704.3336 | Thoudam Satyendra mr | Satyendra Thoudam | Revisiting the effect of nearby supernova remnants on local cosmic rays | 5 pages, 2 figures, accepted in MNRAS Letters, minor text corrections | null | 10.1111/j.1745-3933.2007.00334.x | null | astro-ph | null | In an earlier paper, the effect of the nearby known supernova remnants (SNRs)
on the local cosmic-rays (CRs) was studied, considering different possible
forms of the particle injection time. The present work is a continuation of the
previous work, but assumes a more realistic model of CR propagation in the
Galaxy. The previous work assumed an unbounded three-dimensional diffusion
region, whereas the present one considers a flat cylindrical disc bounded in
both the radial and vertical directions. The study has found that the effect of
the vertical halo boundary $H$ on the local SNR contribution to the observed CR
anisotropy is negligible as long as $H\gtrsim 2kpc$. Considering the values of
the halo height $H\gtrsim 2kpc$ obtained by different authors, the present work
suggests that the study of the effect of local sources on the CR anisotropy can
be carried out without having much information on $H$ and hence, using the much
simpler three-dimentional unbounded solution. Finally, the present work
discusses about the possibility of explaining the observed anisotropy below the
knee by a single dominant source with properly chosen source parameters, and
claims that the source may be an \textit{undetected} old SNR with a
characteristic age of $\sim 1.5\times 10^5 yr$ located at a distance of $\sim
0.57 kpc$ from the Sun.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 10:02:17 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Jun 2007 06:55:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Thoudam",
"Satyendra",
""
]
] |
0704.3337 | Adam S\'odor | \'A. S\'odor, B. Szeidl, J. Jurcsik | The Blazhko behaviour of RR Geminorum II -- long-term photometric
results | Accepted for publication in Astronomy and Astrophysics. About 12
pages, 9 figures, 15 tables (3 of them appear in the paper, the others are
only available electronically at the CDS) | null | 10.1051/0004-6361:20066886 | null | astro-ph | null | Context. RR Gem is one of the few Blazhko RR Lyrae that has photometric
observations available extended enough to study the long-term courses of its
pulsation and modulation properties in detail.
Aims. We investigate the pulsation and modulation properties and the
relations between them in RR Gem using photometric observations from the past
70 years in order to gain further insight into the nature of the Blazhko
modulation.
Methods. We studied the photographic, photoelectric, and CCD light curves
obtained at the Konkoly Observatory and other authors' published maxima
observations. Detailed analysis of the light curves, maximum brightness, and
O-C data are carried out.
Results. RR Gem showed modulation most of the time it was observed. The
modulation amplitude showed strong variations from the undetectable level (less
than 0.04 mag in maximum brightness) to about 0.20 mag. The amplitudes of the
amplitude and phase modulations showed parallel changes, thus the total 'power'
of the modulation have changed during the past 70 years. Parallel changes in
the pulsation and modulation periods occur with a d P_mod / d P_puls = 1.6 +/-
0.8 * 10^3 ratio. We also detected 0.05-0.1 mag changes in the mean maximum
brightness and mean pulsation amplitude.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 10:15:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sódor",
"Á.",
""
],
[
"Szeidl",
"B.",
""
],
[
"Jurcsik",
"J.",
""
]
] |
0704.3338 | Ignazio Ciufolini | Ignazio Ciufolini | Gravitomagnetism, Frame-Dragging and Lunar Laser Ranging | null | null | null | null | gr-qc | null | We discuss here the measurement of gravitomagnetism and frame dragging with
Lunar Laser Ranging, LAGEOS and LARES Satellites, and Gravity Probe B.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 10:34:47 GMT"
},
{
"version": "v2",
"created": "Thu, 10 May 2007 19:11:17 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ciufolini",
"Ignazio",
""
]
] |
0704.3339 | Christian Robenhagen Ravnsh{\o}j | Christian Robenhagen Ravnshoj | Generators of Jacobians of Hyperelliptic Curves | 6 pages | null | null | null | math.AG | null | This paper provides a probabilistic algorithm to determine generators of the
m-torsion subgroup of the Jacobian of a hyperelliptic curve of genus two.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 10:35:48 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Ravnshoj",
"Christian Robenhagen",
""
]
] |
0704.3340 | Anirban Kundu | Biplob Bhattacherjee and Anirban Kundu | Production of Higgs boson excitations of universal extra dimension at
the Large Hadron Collider | 11 pages, 5 figures, the discussion on possible backgrounds has been
considerably extended, some new references added, version to be published in
PLB | Phys.Lett.B653:300-306,2007 | 10.1016/j.physletb.2007.07.062 | CU-PHYSICS/07-2007 | hep-ph | null | The Kaluza-Klein excitations of the Higgs bosons of the universal extra
dimension model are extremely challenging to detect. We discuss the production
and possible detection mechanisms of such excited scalars at the LHC. The
dominant production mechanism of such scalars is from the decay of the excited
third generation quarks. In particular, the charged Higgs boson has a large
production cross-section over most of the parameter space. We highlight how one
may detect these excited scalars. We also comment on the production and
detection of excited neutral scalars.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 10:37:08 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Jul 2007 07:53:04 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bhattacherjee",
"Biplob",
""
],
[
"Kundu",
"Anirban",
""
]
] |
0704.3341 | Adam S\'odor | \'A. s\'odor | Studying Blazhko RR Lyrae stars with the 24-inch telescope of the
Konkoly Observatory | Accepted for publication in Astronomische Nachrichten (Astronomical
Notes). 4 pages, 3 figs | null | 10.1002/asna.200710812 | null | astro-ph | null | About a dozen field RR Lyrae stars have been observed with the 24-inch
Heyde-Zeiss telescope of the Konkoly Observatory at Sv\'abhegy, Budapest, since
its refurbishment in 2003. Most of the observing time is allocated for the
investigation of the Blazhko modulation, a phenomenon that still does not have
a satisfactory explanation. The obtained multicolour CCD observations are
unique in extent. The accuracy of the measurements makes it possible to detect
low amplitude modulation of the light curve as well. The discovery of Blazhko
stars with low modulation amplitudes warns that the incidence rate of the
Blazhko modulation is, in fact, much larger than it was previously expected.
This makes the efforts exploring the cause of the modulation even more
important. A summary of our measurements and results achieved during the last 3
years is presented.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 11:06:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"sódor",
"Á.",
""
]
] |
0704.3342 | Paolo Papi | Victor G. Kac (MIT), Pierluigi Moseneder Frajria (Politecnico di
Milano), Paolo Papi (Universita' di Roma La Sapienza) | Multiplets of representations, twisted Dirac operators and Vogan's
conjecture in affine setting | Latex file, 89 pages. Several misprints corrected. To appear in
Advances in Mathematics | Adv. Math. 217 (2008), no. 6, 2485--2562. | null | null | math.RT | null | We extend classical results of Kostant and al. on multiplets of
representations of finite-dimensional Lie algebras and on the cubic Dirac
operator to the setting of affine Lie algebras and twisted affine cubic Dirac
operator. We prove in this setting an analogue of Vogan's conjecture on
infinitesimal characters of Harish-Chandra modules in terms of Dirac
cohomology. For our calculations we use the machinery of Lie conformal and
vertex algebras.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 10:48:48 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Jun 2007 13:48:30 GMT"
},
{
"version": "v3",
"created": "Tue, 2 Oct 2007 06:47:28 GMT"
}
] | 2008-10-11T00:00:00 | [
[
"Kac",
"Victor G.",
"",
"MIT"
],
[
"Frajria",
"Pierluigi Moseneder",
"",
"Politecnico di\n Milano"
],
[
"Papi",
"Paolo",
"",
"Universita' di Roma La Sapienza"
]
] |
0704.3343 | Jean-Luc Lehners | Jean-Luc Lehners, Paul Smyth and K.S. Stelle | Kaluza-Klein Induced Supersymmetry Breaking for Braneworlds in Type IIB
Supergravity | 27 pages, no figures, replaced with published version | Nucl.Phys.B790:89-110,2008 | 10.1016/j.nuclphysb.2007.08.016 | null | hep-th hep-ph | null | We consider Z_2-symmetric braneworlds arising from 5-sphere compactifications
with 5-form flux in type IIB supergravity. This Kaluza-Klein reduction produces
a D=5 theory which supports 1/2-supersymmetric Z_2-symmetric domain-wall
solutions. However, upon lifting such solutions back to D=10, one finds that
supersymmetry is broken by 5-sphere Kaluza-Klein effects. This happens owing to
the action on the Killing spinor of the Z_2 \subset SO(1,9) symmetry, which
requires an orientation-reversing transformation in the 5-sphere directions
together with the flip of the orbifold coordinate. We study the consequences of
this supersymmetry breaking for the masses of fermion fluctuation modes about
the brane background and find a natural two-scale hierarchy: some bulk modes
have characteristic masses of order 1/L_5 but other modes more closely
associated to the branes have an additional factor exp(-\rho/L_5), where L_5 is
the AdS_5 length parameter and \rho is the orbifold size.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 11:11:05 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Sep 2007 18:59:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lehners",
"Jean-Luc",
""
],
[
"Smyth",
"Paul",
""
],
[
"Stelle",
"K. S.",
""
]
] |
0704.3344 | Wieslaw Placzek | W. Placzek, K. Golec-Biernat, S. Jadach, M. Skrzypek | Solving the QCD NLO evolution equations with a Markovian Monte Carlo | 12 pages, 2 eps figures | Acta Phys.Polon.B38:2357-2368,2007 | null | IFJPAN-IV-2007-7 | hep-ph | null | We discuss precision Monte Carlo (MC) calculations for solving the QCD
evolution equations up to the next-to-leading-order (NLO) level. They employ
forward Markovian Monte Carlo algorithms, which provide rigorous solutions of
the above equations. These algorithms are implemented in the form of the Monte
Carlo program EvolFMC. This program has been cross-checked with independent,
non-MC, programs (QCDNum16 and APCheb33) and the numerical agreement at the
level of 0.1% has been found.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 11:07:19 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Placzek",
"W.",
""
],
[
"Golec-Biernat",
"K.",
""
],
[
"Jadach",
"S.",
""
],
[
"Skrzypek",
"M.",
""
]
] |
0704.3345 | Reza Saffari | R. Saffari and Y. Sobouti | (Erratum) An f(R) gravitation for galactic environments | Accepted for publication in A&A | A&A 472, 833 (2007) | 10.1051/0004-6361:20077452 | null | astro-ph | null | Without abstract.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 11:49:03 GMT"
},
{
"version": "v2",
"created": "Mon, 7 May 2007 09:34:17 GMT"
},
{
"version": "v3",
"created": "Tue, 17 Jul 2007 07:22:27 GMT"
}
] | 2007-09-13T00:00:00 | [
[
"Saffari",
"R.",
""
],
[
"Sobouti",
"Y.",
""
]
] |
0704.3346 | Marcos Alvarez | Marcos Alvarez, Paul P. Martin | Higher-dimensional Temperley-Lieb algebras | 12 pages, 4 figures | null | null | null | math-ph math.MP | null | A category which generalises to higher dimensions many of the features of the
Temperley-Lieb category is introduced.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:52:21 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Apr 2007 12:48:41 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Alvarez",
"Marcos",
""
],
[
"Martin",
"Paul P.",
""
]
] |
0704.3347 | Goren Gordon | Goren Gordon, Noam Erez and Gershon Kurizki | Universal dynamical decoherence control of noisy single-and multi-qubit
systems | 28 pages, 4 figures | J. Phys. B: At. Mol. Opt. Phys. 40 (2007) S75-S93 | 10.1088/0953-4075/40/9/S04 | null | quant-ph | null | In this article we develop, step by step, the framework for universal
dynamical control of two-level systems (TLS) or qubits experiencing amplitude-
or phase-noise (AN or PN) due to coupling to a thermal bath. A comprehensive
arsenal of modulation schemes is introduced and applied to either AN or PN,
resulting in completely analogous formulae for the decoherence rates, thus
underscoring the unified nature of this universal formalism. We then address
the extension of this formalism to multipartite decoherence control, where
symmetries are exploited to overcome decoherence.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:07:13 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Gordon",
"Goren",
""
],
[
"Erez",
"Noam",
""
],
[
"Kurizki",
"Gershon",
""
]
] |
0704.3348 | Jon Magne Leinaas | Jon Magne Leinaas, Jan Myrheim and Eirik Ovrum | Extreme points of the set of density matrices with positive partial
transpose | 4 pages, 2 figures | Phys. Rev. A 76, 034304 (2007) | 10.1103/PhysRevA.76.034304 | null | quant-ph | null | We present a necessary and sufficient condition for a finite dimensional
density matrix to be an extreme point of the convex set of density matrices
with positive partial transpose with respect to a subsystem. We also give an
algorithm for finding such extreme points and illustrate this by some examples.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:15:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Leinaas",
"Jon Magne",
""
],
[
"Myrheim",
"Jan",
""
],
[
"Ovrum",
"Eirik",
""
]
] |
0704.3349 | Antonios Manoussos | George Costakis, Antonios Manoussos | J-class weighted shifts on the space of bounded sequences of complex
numbers | We correct some of the statements and the proofs | null | null | null | math.FA math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a characterization of $J$-class and $J^{mix}$-class unilateral
weighted shifts on $l^{\infty}(\mathbb{N})$ in terms of their weight sequences.
In contrast to the previously mentioned result we show that a bilateral
weighted shift on $l^{\infty}(\mathbb{Z})$ cannot be a $J$-class operator.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:23:01 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Sep 2007 12:25:50 GMT"
},
{
"version": "v3",
"created": "Mon, 23 Jun 2008 13:39:17 GMT"
}
] | 2008-06-23T00:00:00 | [
[
"Costakis",
"George",
""
],
[
"Manoussos",
"Antonios",
""
]
] |
0704.3350 | Amit Aronovitch | Amit Aronovitch and Uzy Smilansky | The Statistics of the Points Where Nodal Lines Intersect a Reference
Curve | 33 pages, 13 figures, 1 table | null | 10.1088/1751-8113/40/32/003 | null | nlin.CD | null | We study the intersection points of a fixed planar curve $\Gamma$ with the
nodal set of a translationally invariant and isotropic Gaussian random field
$\Psi(\bi{r})$ and the zeros of its normal derivative across the curve. The
intersection points form a discrete random process which is the object of this
study. The field probability distribution function is completely specified by
the correlation $G(|\bi{r}-\bi{r}'|) = <\Psi(\bi{r}) \Psi(\bi{r}')>$.
Given an arbitrary $G(|\bi{r}-\bi{r}'|)$, we compute the two point
correlation function of the point process on the line, and derive other
statistical measures (repulsion, rigidity) which characterize the short and
long range correlations of the intersection points. We use these statistical
measures to quantitatively characterize the complex patterns displayed by
various kinds of nodal networks. We apply these statistics in particular to
nodal patterns of random waves and of eigenfunctions of chaotic billiards. Of
special interest is the observation that for monochromatic random waves, the
number variance of the intersections with long straight segments grows like $L
\ln L$, as opposed to the linear growth predicted by the percolation model,
which was successfully used to predict other long range nodal properties of
that field.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:19:58 GMT"
},
{
"version": "v2",
"created": "Wed, 27 Jun 2007 10:53:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Aronovitch",
"Amit",
""
],
[
"Smilansky",
"Uzy",
""
]
] |
0704.3351 | Eric Benoit | Eric Benoit, Laurent Foulloy (LISTIC) | Symbolic sensors : one solution to the numerical-symbolic interface | null | Proceedings of the IMACS International Workshop on Decision
Support Systems and Qualitative Reasoning, Toulouse, France, 13-15 March 1991
(03/1991) 321-326 | null | null | physics.ins-det | null | This paper introduces the concept of symbolic sensor as an extension of the
smart sensor one. Then, the links between the physical world and the symbolic
one are introduced. The creation of symbols is proposed within the frame of the
pretopology theory. In order to adapt the sensor to the measurement context, a
learning process has been used to provide an adaptive interpretation of the
measurement. Finally, an example is presented in the case of a temperature
measurement.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:27:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Benoit",
"Eric",
"",
"LISTIC"
],
[
"Foulloy",
"Laurent",
"",
"LISTIC"
]
] |
0704.3352 | Frederic Dias | F. Dias, A.I. Dyachenko, V.E. Zakharov | Theory of weakly damped free-surface flows: a new formulation based on
potential flow solutions | null | null | 10.1016/j.physleta.2007.09.027 | null | physics.ao-ph physics.flu-dyn | null | Several theories for weakly damped free-surface flows have been formulated.
In this paper we use the linear approximation to the Navier-Stokes equations to
derive a new set of equations for potential flow which include dissipation due
to viscosity. A viscous correction is added not only to the irrotational
pressure (Bernoulli's equation), but also to the kinematic boundary condition.
The nonlinear Schr\"odinger (NLS) equation that one can derive from the new set
of equations to describe the modulations of weakly nonlinear, weakly damped
deep-water gravity waves turns out to be the classical damped version of the
NLS equation that has been used by many authors without rigorous justification.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:28:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dias",
"F.",
""
],
[
"Dyachenko",
"A. I.",
""
],
[
"Zakharov",
"V. E.",
""
]
] |
0704.3353 | Eric Benoit | Eric Benoit, Laurent Foulloy (LISTIC) | Symbolic sensors | null | Proceedings of the International Symposium on Artificial
Intelligence Based Measurement and Control (AIMaC'91), Kyoto, Japan (09/1991)
131-136 | null | null | physics.ins-det | null | This paper deals with sensors which compute and report linguistic assessments
of their values.Such sensors, called symbolic sensors are a natural extension
of smart ones when working with control systems which use artificial
intelligence based technics. After having recalled the smart sensor concepts,
this paper introduces the symbolic sensor ones. Links between the physical
world and the symbolic one are described. It is then shown how Zadeh's
approximate reasoning theory provides a smart way to implement symbolic
sensors. Finally, since the symbolic sensor is a general component, a
functional adaptation to the measurement context is proposed.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:29:45 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Benoit",
"Eric",
"",
"LISTIC"
],
[
"Foulloy",
"Laurent",
"",
"LISTIC"
]
] |
0704.3354 | Antonios Manoussos | George Costakis, Antonios Manoussos | J-class operators and hypercyclicity | 21 pages. Shorter version submitted for publication | null | null | null | math.FA math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of the present work is to treat a new notion related to linear
dynamics, which can be viewed as a "localization" of the notion of
hypercyclicity. In particular, let $T$ be a bounded linear operator acting on a
Banach space $X$ and let $x$ be a non-zero vector in $X$ such that for every
open neighborhood $U\subset X$ of $x$ and every non-empty open set $V\subset X$
there exists a positive integer $n$ such that $T^{n}U\cap V\neq\emptyset$. In
this case $T$ will be called a $J$-class operator. We investigate the class of
operators satisfying the above property and provide various examples. It is
worthwhile to mention that many results from the theory of hypercyclic
operators have their analogues in this setting. For example we establish
results related to the Bourdon-Feldman theorem and we characterize the
$J$-class weighted shifts. We would also like to stress that even non-separable
Banach spaces which do not support topologically transitive operators, as for
example $l^{\infty}(\mathbb{N})$, do admit $J$-class operators.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:31:16 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Mar 2009 23:21:20 GMT"
}
] | 2009-03-12T00:00:00 | [
[
"Costakis",
"George",
""
],
[
"Manoussos",
"Antonios",
""
]
] |
0704.3355 | Alexander Konovalov | Alexander Konovalov | Wreath products in modular group algebras of some finite 2-groups | 3 pages | Acta Mathematica Academiae Paedagogiace Nyiregyhaziensis, Vol.23,
No.2, 2007, p.125-127 | null | null | math.RA math.GR | null | Let $K$ be field of characteristic 2 and let $G$ be a finite non-abelian
2-group with the cyclic derived subgroup $G'$, and there exists a central
element $z$ of order 2 in $Z(G) \backslash G'$. We prove that the unit group of
the group algebra $KG$ possesses a section isomorphic to the wreath product of
a group of order 2 with the derived subgroup of the group $G$, giving for such
groups a positive answer to the question of A. Shalev.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:31:20 GMT"
}
] | 2008-01-03T00:00:00 | [
[
"Konovalov",
"Alexander",
""
]
] |
0704.3356 | Yohan Payan | Alexandre Moreau-Gaudry (TIMC - IMAG), Anne Prince (CMUDD), Jacques
Demongeot (TIMC - IMAG), Yohan Payan (TIMC - IMAG) | Pr\'evention des escarres chez les parapl\'egiques : une nouvelle
approche par \'electrostimulation linguale | null | Actes de la 4\`eme Conf\'erence Handicap 2006 "Nouvelles
Technologies au service de l'homme" (2006) 216-220 | null | null | physics.med-ph q-bio.NC | null | Pressure ulcers are recognized as a major health issue in individuals with
spinal cord injuries and new approaches to prevent this pathology are
necessary. An innovative health strategy is being developed through the use of
computer and sensory substitution via the tongue in order to compensate for the
sensory loss in the buttock area for individuals with paraplegia. This sensory
compensation will enable individuals with spinal cord injuries to be aware of a
localized excess of pressure at the skin/seat interface and, consequently, will
enable them to prevent the formation of pressure ulcers by relieving the
cutaneous area of suffering. This work reports an initial evaluation of this
approach and the feasibility of creating an adapted behavior, with a change in
pressure as a response to electro-stimulated information on the tongue.
Obtained during a clinical study in 10 healthy seated subjects, the first
results are encouraging, with 92% success in 100 performed tests. These
results, which have to be completed and validated in the paraplegic population,
may lead to a new approach to education in health to prevent the formation of
pressure ulcers within this population. Keywords: Spinal Cord Injuries,
Pressure Ulcer, Sensory Substitution, Health Education, Biomedical Informatics.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:33:36 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Moreau-Gaudry",
"Alexandre",
"",
"TIMC - IMAG"
],
[
"Prince",
"Anne",
"",
"CMUDD"
],
[
"Demongeot",
"Jacques",
"",
"TIMC - IMAG"
],
[
"Payan",
"Yohan",
"",
"TIMC - IMAG"
]
] |
0704.3357 | Jaroslaw Korbicz | J. K. Korbicz, F. Hulpke, A. Osterloh, and M. Lewenstein | Statistical-mechanical description of quantum entanglement | final version | J. Phys. A: Math. Theor. 41 (2008) 375301 | 10.1088/1751-8113/41/37/375301 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a description of finite dimensional quantum entanglement, based on
a study of the space of all convex decompositions of a given density matrix. On
this space we construct a system of real polynomial equations describing
separable states. We further study this system using statistical mechanical
methods. Finally, we apply our techniques to Werner states of two qubits and
obtain a sufficient criterion for separability.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:34:34 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Aug 2008 12:42:57 GMT"
},
{
"version": "v3",
"created": "Wed, 27 Aug 2008 13:24:22 GMT"
}
] | 2008-08-27T00:00:00 | [
[
"Korbicz",
"J. K.",
""
],
[
"Hulpke",
"F.",
""
],
[
"Osterloh",
"A.",
""
],
[
"Lewenstein",
"M.",
""
]
] |
0704.3358 | Elise Janvresse | Elise Janvresse (LMRS), Thierry De La Rue (LMRS) | A Class of pairwise-independent Joinings | Dedicated to the memory of Professor Jos\'e de Sam Lazaro | Ergodic Theory and Dynamical Systems 28, 5 (2008) 1545-1557 | 10.1017/S0143385707000958 | null | math.PR | null | We introduce a special class of pairwise-independent self-joinings for a
stationary process: Those for which one coordinate is a continuous function of
the two others. We investigate which properties on the process the existence of
such a joining entails. In particular, we prove that if the process is
aperiodic, then it has positive entropy. Our other results suggest that such
pairwise independent, non-independent self-joinings exist only in very specific
situations: Essentially when the process is a subshift of finite type
topologically conjugate to a full-shift. This provides an argument in favor of
the conjecture that 2-fold mixing implies 3-fold-mixing.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:35:53 GMT"
},
{
"version": "v2",
"created": "Fri, 4 May 2007 13:09:34 GMT"
}
] | 2008-09-29T00:00:00 | [
[
"Janvresse",
"Elise",
"",
"LMRS"
],
[
"De La Rue",
"Thierry",
"",
"LMRS"
]
] |
0704.3359 | Alex Smola J | Quoc Le and Alexander Smola | Direct Optimization of Ranking Measures | null | null | null | null | cs.IR cs.AI | null | Web page ranking and collaborative filtering require the optimization of
sophisticated performance measures. Current Support Vector approaches are
unable to optimize them directly and focus on pairwise comparisons instead. We
present a new approach which allows direct optimization of the relevant loss
functions. This is achieved via structured estimation in Hilbert spaces. It is
most related to Max-Margin-Markov networks optimization of multivariate
performance measures. Key to our approach is that during training the ranking
problem can be viewed as a linear assignment problem, which can be solved by
the Hungarian Marriage algorithm. At test time, a sort operation is sufficient,
as our algorithm assigns a relevance score to every (document, query) pair.
Experiments show that the our algorithm is fast and that it works very well.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:36:55 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Le",
"Quoc",
""
],
[
"Smola",
"Alexander",
""
]
] |
0704.3360 | Dougal Mackey | A.D. Mackey and P. Broby Nielsen (IfA, Edinburgh) | A double main sequence turn-off in the rich star cluster NGC 1846 in the
Large Magellanic Cloud | 9 pages, 8 figures, accepted for publication in MNRAS. A version with
full resolution figures may be obtained at
http://www.roe.ac.uk/~dmy/papers/MN-07-0441-MJ_rv.ps.gz (postscript) or at
http://www.roe.ac.uk/~dmy/papers/MN-07-0441-MJ_rv.pdf (PDF) | Mon.Not.Roy.Astron.Soc.379:151-158,2007 | 10.1111/j.1365-2966.2007.11915.x | null | astro-ph | null | We report on HST/ACS photometry of the rich intermediate-age star cluster NGC
1846 in the Large Magellanic Cloud, which clearly reveals the presence of a
double main sequence turn-off in this object. Despite this, the main sequence,
sub-giant branch, and red giant branch are all narrow and well-defined, and the
red clump is compact. We examine the spatial distribution of turn-off stars and
demonstrate that all belong to NGC 1846 rather than to any field star
population. In addition, the spatial distributions of the two sets of turn-off
stars may exhibit different central concentrations and some asymmetries. By
fitting isochrones, we show that the properties of the colour-magnitude diagram
can be explained if there are two stellar populations of equivalent metal
abundance in NGC 1846, differing in age by approximately 300 Myr. The absolute
ages of the two populations are ~1.9 and ~2.2 Gyr, although there may be a
systematic error of up to +/-0.4 Gyr in these values. The metal abundance
inferred from isochrone fitting is [M/H] ~ -0.40, consistent with spectroscopic
measurements of [Fe/H]. We propose that the observed properties of NGC 1846 can
be explained if this object originated via the tidal capture of two star
clusters formed separately in a star cluster group in a single giant molecular
cloud. This scenario accounts naturally for the age difference and uniform
metallicity of the two member populations, as well as the differences in their
spatial distributions.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:44:08 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Mackey",
"A. D.",
"",
"IfA, Edinburgh"
],
[
"Nielsen",
"P. Broby",
"",
"IfA, Edinburgh"
]
] |
0704.3361 | Ronaldo de Souza Mr. | R. E. de Souza, R. Teixeira | Kinematic segregation of nearby disk stars from the Hipparcos database | 19 pages | null | 10.1051/0004-6361:20066257 | null | astro-ph | null | To better understand our Galaxy, we investigate the pertinency of describing
the sys tem of nearby disk stars in terms of a two-components Schwarzschild
velocity distributio n.Using the proper motion and parallax information of
Hipparcos database, we determine t he parameters characterizing the local
stellar velocity field of a sample of 22000 disk stars. The sample we use is
essentially the same as the one described by the criteria ad opted to study the
LSR and the stream motion of the nearby stellar population
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:38:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"de Souza",
"R. E.",
""
],
[
"Teixeira",
"R.",
""
]
] |
0704.3362 | Nagalakshmi Rao A | Nagalakshmi A. Rao and B. A. Kagali | Eigenfunctions of the two-dimensional Moshinsky-Szczepaniak Oscillator | Latex, 8 Pages, No Figures | Mod. Phy. Letters A, Vol.19, No.28 (2004) 2147 - 2153 | null | null | quant-ph | null | While the usual harmonic oscillator potential gives discrete energies in the
non-relativistic case, it does not however give genuine bound states in the
relativistic case if the potential is treated in the usual way. In the present
article, we have obtained the eigenfunctions of the Dirac oscillator in two
spatial dimensions, adapting the prescription of Moshinsky.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:41:35 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Rao",
"Nagalakshmi A.",
""
],
[
"Kagali",
"B. A.",
""
]
] |
0704.3363 | Hani Shaker | Hani Shaker | Topology and Factorization of Polynomials | Accepted in Mathematica Scandinavica. 8 pages | null | null | null | math.AG math.AT | null | For any polynomial $P \in \mathbb{C}[X_1,X_2,...,X_n]$, we describe a
$\mathbb{C}$-vector space $F(P)$ of solutions of a linear system of equations
coming from some algebraic partial differential equations such that the
dimension of $F(P)$ is the number of irreducible factors of $P$. Moreover, the
knowledge of $F(P)$ gives a complete factorization of the polynomial $P$ by
taking gcd's. This generalizes previous results by Ruppert and Gao in the case
$n=2$.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:42:10 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Apr 2008 09:15:51 GMT"
}
] | 2008-04-02T00:00:00 | [
[
"Shaker",
"Hani",
""
]
] |
0704.3364 | J. R. Kirtley | J.R. Kirtley, C. Kallin, C.W. Hicks, E.-A. Kim, Y. Liu, K.A. Moler, Y.
Maeno, and K.D. Nelson | Upper limit on spontaneous supercurrents in Sr$_2$RuO$_4$ | 9 pages | Phys. Rev. B 76, 014526 (2007) | 10.1103/PhysRevB.76.014526 | null | cond-mat.supr-con | null | It is widely believed that the perovskite Sr$_2$RuO$_4$ is an unconventional
superconductor with broken time reversal symmetry. It has been predicted that
superconductors with broken time reversal symmetry should have spontaneously
generated supercurrents at edges and domain walls. We have done careful imaging
of the magnetic fields above Sr$_2$RuO$_4$ single crystals using scanning Hall
bar and SQUID microscopies, and see no evidence for such spontaneously
generated supercurrents. We use the results from our magnetic imaging to place
upper limits on the spontaneously generated supercurrents at edges and domain
walls as a function of domain size. For a single domain, this upper limit is
below the predicted signal by two orders of magnitude. We speculate on the
causes and implications of the lack of large spontaneous supercurrents in this
very interesting superconducting system.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 12:48:42 GMT"
}
] | 2010-10-11T00:00:00 | [
[
"Kirtley",
"J. R.",
""
],
[
"Kallin",
"C.",
""
],
[
"Hicks",
"C. W.",
""
],
[
"Kim",
"E. -A.",
""
],
[
"Liu",
"Y.",
""
],
[
"Moler",
"K. A.",
""
],
[
"Maeno",
"Y.",
""
],
[
"Nelson",
"K. D.",
""
]
] |
0704.3365 | Takehiro Nagasima | Takehiro Nagasima, Akira R. Kinjo, Takashi Mitsui, Ken Nishikawa | Wang-Landau molecular dynamics technique to search for low-energy
conformational space of proteins | 8 pages, 7 figures, accepted for publication in Physical Review E | Phys. Rev. E 75, 066706 (2007) | 10.1103/PhysRevE.75.066706 | null | physics.comp-ph physics.bio-ph | null | Multicanonical molecular dynamics (MD) is a powerful technique for sampling
conformations on rugged potential surfaces such as protein. However, it is
notoriously difficult to estimate the multicanonical temperature effectively.
Wang and Landau developed a convenient method for estimating the density of
states based on a multicanonical Monte Carlo method. In their method, the
density of states is calculated autonomously during a simulation. In this paper
we develop a set of techniques to effectively apply the Wang-Landau method to
MD simulations. In the multicanonical MD, the estimation of the derivative of
the density of states is critical. In order to estimate it accurately, we
devise two original improvements. First, the correction for the density of
states is made smooth by using the Gaussian distribution obtained by a short
canonical simulation. Second, an approximation is applied to the derivative,
which is based on the Gaussian distribution and the multiple weighted histogram
technique. A test of this method was performed with small polypeptides,
Met-enkephalin and Trp-cage, and it is demonstrated that Wang-Landau MD is
consistent with replica exchange MD but can sample much larger conformational
space.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:05:35 GMT"
},
{
"version": "v2",
"created": "Thu, 17 May 2007 12:30:02 GMT"
},
{
"version": "v3",
"created": "Fri, 18 May 2007 02:33:00 GMT"
}
] | 2007-11-01T00:00:00 | [
[
"Nagasima",
"Takehiro",
""
],
[
"Kinjo",
"Akira R.",
""
],
[
"Mitsui",
"Takashi",
""
],
[
"Nishikawa",
"Ken",
""
]
] |
0704.3366 | Alexander Altmeyer | A. Altmeyer (1), S. Riedl (1 and 2), M. J. Wright (1), C. Kohstall
(1), J. Hecker Denschlag (1) and R. Grimm (1 and 2) ((1) Inst. of
Experimental Physics and Center for Quantum Physics, Univ. Innsbruck,
Austria, (2) Inst. for Quantum Optics and Quantum Information, Acad. of
Sciences, Austria) | Dynamics of a strongly interacting Fermi gas: the radial quadrupole mode | 11 pages, 11 figures v2: minor changes | Phys. Rev. A 76, 033610 (2007) | 10.1103/PhysRevA.76.033610 | null | cond-mat.other | null | We report on measurements of an elementary surface mode in an ultracold,
strongly interacting Fermi gas of 6Li atoms. The radial quadrupole mode allows
us to probe hydrodynamic behavior in the BEC-BCS crossover without being
influenced by changes in the equation of state. We examine frequency and
damping of this mode, along with its expansion dynamics. In the unitarity limit
and on the BEC side of the resonance, the observed frequencies agree with
standard hydrodynamic theory. However, on the BCS side of the crossover, a
striking down shift of the oscillation frequency is observed in the
hydrodynamic regime as a precursor to an abrupt transition to collisionless
behavior; this indicates coupling of the oscillation to fermionic pairs.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:07:37 GMT"
},
{
"version": "v2",
"created": "Tue, 21 Aug 2007 16:48:43 GMT"
}
] | 2007-09-24T00:00:00 | [
[
"Altmeyer",
"A.",
"",
"1 and 2"
],
[
"Riedl",
"S.",
"",
"1 and 2"
],
[
"Wright",
"M. J.",
"",
"1 and 2"
],
[
"Kohstall",
"C.",
"",
"1 and 2"
],
[
"Denschlag",
"J. Hecker",
"",
"1 and 2"
],
[
"Grimm",
"R.",
"",
"1 and 2"
]
] |
0704.3367 | Pavel Buividovich | P. V. Buividovich, M. I. Polikarpov | Random walks of Wilson loops in the screening regime | Major revision of the previous version, to appear in Nucl. Phys. B
(10 pages RevTeX, 3 figures) | Nucl.Phys.B790:28-41,2008 | 10.1016/j.nuclphysb.2007.08.013 | ITEP-LAT/2007-07 | hep-ph | null | Dynamics of Wilson loops in pure Yang-Mills theories is analyzed in terms of
random walks of the holonomies of the gauge field on the gauge group manifold.
It is shown that such random walks should necessarily be free. The distribution
of steps of these random walks is related to the spectrum of string tensions of
the theory and to certain cumulants of Yang-Mills curvature tensor. It turns
out that when colour charges are completely screened, the holonomies of the
gauge field can change only by the elements of the group center, which
indicates that in the screening regime confinement persists due to thin center
vortices. Thick center vortices are also considered and the emergence of such
stepwise changes in the limits of infinitely thin vortices and infinitely large
loops is demonstrated.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:16:35 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Apr 2007 05:03:40 GMT"
},
{
"version": "v3",
"created": "Sun, 9 Sep 2007 11:17:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Buividovich",
"P. V.",
""
],
[
"Polikarpov",
"M. I.",
""
]
] |
0704.3368 | Thomas Cokelaer | LIGO Scientific Collaboration: B. Abbott, et al | Search for gravitational waves from binary inspirals in S3 and S4 LIGO
data | 12 pages, 11 figures | Phys.Rev.D77:062002,2008 | 10.1103/PhysRevD.77.062002 | null | gr-qc | null | We report on a search for gravitational waves from the coalescence of compact
binaries during the third and fourth LIGO science runs. The search focused on
gravitational waves generated during the inspiral phase of the binary
evolution. In our analysis, we considered three categories of compact binary
systems, ordered by mass: (i) primordial black hole binaries with masses in the
range 0.35 M(sun) < m1, m2 < 1.0 M(sun), (ii) binary neutron stars with masses
in the range 1.0 M(sun) < m1, m2 < 3.0 M(sun), and (iii) binary black holes
with masses in the range 3.0 M(sun)< m1, m2 < m_(max) with the additional
constraint m1+ m2 < m_(max), where m_(max) was set to 40.0 M(sun) and 80.0
M(sun) in the third and fourth science runs, respectively. Although the
detectors could probe to distances as far as tens of Mpc, no gravitational-wave
signals were identified in the 1364 hours of data we analyzed. Assuming a
binary population with a Gaussian distribution around 0.75-0.75 M(sun), 1.4-1.4
M(sun), and 5.0-5.0 M(sun), we derived 90%-confidence upper limit rates of 4.9
yr^(-1) L10^(-1) for primordial black hole binaries, 1.2 yr^(-1) L10^(-1) for
binary neutron stars, and 0.5 yr^(-1) L10^(-1) for stellar mass binary black
holes, where L10 is 10^(10) times the blue light luminosity of the Sun.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:38:17 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Apr 2007 10:56:53 GMT"
},
{
"version": "v3",
"created": "Wed, 23 Jan 2008 16:01:48 GMT"
},
{
"version": "v4",
"created": "Thu, 24 Jan 2008 10:01:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"LIGO Scientific Collaboration",
"",
""
],
[
"Abbott",
"B.",
""
]
] |
0704.3369 | Rebecca Martin | R.G. Martin, S.H.Lubow, J.E. Pringle, M C. Wyatt | Planetary Migration to Large Radii | Accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.378:1589-1600,2007 | 10.1111/j.1365-2966.2007.11906.x | null | astro-ph | null | There is evidence for the existence of massive planets at orbital radii of
several hundred AU from their parent stars where the timescale for planet
formation by core accretion is longer than the disc lifetime. These planets
could have formed close to their star and then migrated outwards. We consider
how the transfer of angular momentum by viscous disc interactions from a
massive inner planet could cause significant outward migration of a smaller
outer planet. We find that it is in principle possible for planets to migrate
to large radii. We note, however, a number of effects which may render the
process somewhat problematic.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:13:58 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Martin",
"R. G.",
""
],
[
"Lubow",
"S. H.",
""
],
[
"Pringle",
"J. E.",
""
],
[
"Wyatt",
"M C.",
""
]
] |
0704.3370 | J. -C. Schlage-Puchta | Gautami Bhowmik, Jan-Christoph Schlage-Puchta | Natural boundary of Dirichlet series | null | null | null | null | math.CV math.NT | null | We prove some conditions on the existence of natural boundaries of Dirichlet
series. We show that generically the presumed boundary is the natural one. We
also give an application of natural boundaries in determining asymptotic
results.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:45:42 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bhowmik",
"Gautami",
""
],
[
"Schlage-Puchta",
"Jan-Christoph",
""
]
] |
0704.3371 | Ghislain Jaudon | Ghislain Jaudon | Some remarks on generalized roundness | 3 pages | null | null | null | math.GR math.MG | null | By using the links between generalized roundness, negative type inequalities
and equivariant Hilbert space compressions, we obtain that the generalized
roundness of the usual Cayley graph of finitely generated free groups and free
abelian groups of rank $\geq 2$ equals 1. This answers a question of J-F.
Lafont and S. Prassidis.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:28:53 GMT"
},
{
"version": "v2",
"created": "Mon, 14 May 2007 08:26:07 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Jaudon",
"Ghislain",
""
]
] |
0704.3372 | Norbert Van den Bergh | Norbert Van den Bergh, John Carminati, Hamid Reza Karimian | Shearfree perfect fluids with solenoidal magnetic curvature and a
gamma-law equation of state | 11 pages | Class.Quant.Grav.24:3735-3744,2007 | 10.1088/0264-9381/24/14/012 | null | gr-qc | null | We show that shearfree perfect fluids obeying an equation of state p=(gamma
-1) mu are non-rotating or non-expanding under the assumption that the spatial
divergence of the magnetic part of the Weyl tensor is zero.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:49:55 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bergh",
"Norbert Van den",
""
],
[
"Carminati",
"John",
""
],
[
"Karimian",
"Hamid Reza",
""
]
] |
0704.3373 | Michael T. Anderson | Michael T. Anderson | Extension of symmetries on Einstein manifolds with boundary | Correction to proof of main result given in new Appendix | Selecta Mathematica, vol. 16 (2010), 343-375 | null | null | math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the validity of the isometry extension property for
(Riemannian) Einstein metrics on manifolds with boundary. Given a metric on the
boundary, this is the issue of whether any Killing field of the boundary metric
extends to a Killing field of any bulk or filling Einstein metric inducing the
given data on the boundary. Under a mild condition on the fundamental group,
this is proved to be the case at least when the Killing field preserves the
mean curvature of the boundary.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:46:48 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 16:00:49 GMT"
},
{
"version": "v3",
"created": "Mon, 16 Jun 2008 21:46:16 GMT"
},
{
"version": "v4",
"created": "Mon, 27 Oct 2008 15:05:32 GMT"
},
{
"version": "v5",
"created": "Sun, 14 Mar 2010 18:23:32 GMT"
},
{
"version": "v6",
"created": "Wed, 8 May 2013 16:38:14 GMT"
}
] | 2013-05-09T00:00:00 | [
[
"Anderson",
"Michael T.",
""
]
] |
0704.3374 | Jean-Pierre Luminet | Jean-Pierre Luminet | Geometry and Topology in Relativistic Cosmology | 14 pages, invited talk given at "More geometrico" Conference, 3-4 may
2005, Milano University (Italy), to be published in Proceedings "New Trends
in Geometry, and Its Role in the Natural and Life Sciences", eds. C.
Bartocci, L. Boi & C. Sinigaglia, Elsevier | null | null | null | astro-ph | null | General relativity does not allow one to specify the topology of space,
leaving the possibility that space is multiply rather than simply connected. We
review the main mathematical properties of multiply connected spaces, and the
different tools to classify them and to analyse their properties. Following
their mathematical classification, we describe the different possible
muticonnected spaces which may be used to construct Friedmann-Lemaitre universe
models. Observational tests concern the distribution of images of discrete
cosmic objects or more global effects, mainly those concerning the Cosmic
Microwave Background. According to the 2003-2006 WMAP data releases, various
deviations from the flat infinite universe model predictions hint at a possible
non-trivial topology for the shape of space. In particular, a finite universe
with the topology of the Poincar\'e dodecahedral spherical space fits
remarkably well the data and is a good candidate for explaining both the local
curvature of space and the large angle anomalies in the temperature power
spectrum. Such a model of a small universe, whose volume would represent only
about 80% the volume of the observable universe, offers an observational
signature in the form of a predictable topological lens effect on one hand, and
rises new issues on the physics of the early universe on the other hand.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:48:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Luminet",
"Jean-Pierre",
""
]
] |
0704.3375 | Egle Tomasi-Gustafsson | C. Adamuscin, G. I. Gakh, E. Tomasi-Gustafsson | Polarization effects for the reaction $e^++e^-\to \bar p+p $ in presence
of two--photon exchange - Lecture Notes | 50 pages, one figure, Lecture Notes | null | null | null | hep-ph | null | The aim of this work is to give a pedagogical derivation of polarization
observables for the annihilation reaction $e^+ + e^- \to N+ \bar N$. The
reaction mechanism is one photon + two photon exchange, the last is described
by axial parametrization. After deriving the general expressions for the cross
section of a binary process, the matrix element is written in terms of three
complex amplitudes. The method to derive polarization observables is detailed
and all expressions are given in terms of generalized form factors. The
strategy for determining physical form factors in annihilation reactions in
presence of two photon exchange is suggested, on the basis of model independent
properties of the relevant observables.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:48:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Adamuscin",
"C.",
""
],
[
"Gakh",
"G. I.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] |
0704.3376 | Fergal Dalton | Federico Polito and Fergal Dalton | Flow of autonomous traffic on a single multi-lane street | Latex, 18 pages, 12 figures. Need to add more references | null | null | null | physics.comp-ph physics.soc-ph | null | We investigate the behaviour of an original traffic model. The model
considers a single multi-lane street, populated by autonomous vehicles directed
from either end to the other. Lanes have no intrinsic directionality, and the
vehicles are inserted at random at either end and any lane. Collision avoidance
is fully automatic and, to enhance the transport capacity of the street,
vehicles form_trains_ in which they may travel at high speed quite close to the
vehicle in front.
We report on the transit times for vehicles under a wide variety of
conditions: vehicle insertion probability & imbalance and their maximum speed
distribution. We also outline an interesting feature of the model, that the
complex interactions of many vehicles are considerably more powerful than a
simple "keep left" directive which each vehicle should obey.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 13:59:58 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Polito",
"Federico",
""
],
[
"Dalton",
"Fergal",
""
]
] |
0704.3377 | Chris Blake | Chris Blake, Adrian Collister, Ofer Lahav | Halo-model signatures from 380,000 SDSS Luminous Red Galaxies with
photometric redshifts | 14 pages, 10 figures, corrections made to modeling resulting in
changes to numerical results but not conclusions | Mon.Not.Roy.Astron.Soc.385:1257-1269,2008 | 10.1111/j.1365-2966.2007.11925.x | null | astro-ph | null | We analyze the small-scale clustering in "MegaZ-LRG", a large
photometric-redshift catalogue of Luminous Red Galaxies extracted from the
imaging dataset of the Sloan Digital Sky Survey. MegaZ-LRG, presented in a
companion paper, spans the redshift range 0.4 < z < 0.7 with an r.m.s. redshift
error dz ~ 0.03(1+z), covering 5,914 deg^2 to map out a total cosmic volume 2.5
h^-3 Gpc^3. In this study we use 380,000 photometric redshifts to measure
significant deviations from the canonical power-law fit to the angular
correlation function in a series of narrow redshift slices, in which we
construct volume-limited samples. These deviations are direct signatures of the
manner in which these galaxies populate the underlying network of dark matter
haloes. We cleanly delineate the separate contributions of the "1-halo" and
"2-halo" clustering terms and fit our measurements by parameterizing the halo
occupation distribution N(M) of the galaxies. Our results are successfully fit
by a "central" galaxy contribution with a "soft" transition from zero to one
galaxies, combined with a power-law "satellite" galaxy component, the slope of
which is a strong function of galaxy luminosity. The large majority of galaxies
are classified as central objects of their host dark matter haloes rather than
satellites in more massive systems. The effective halo mass of MegaZ-LRG
galaxies lies in the range log_10 (M_eff / h^-1 M_sol) = 13.61 - 13.8
(increasing with redshift, assuming large-scale normalization sigma_8 = 0.8)
for corresponding number densities in the range n_g = 5.03 - 0.56 x 10^-4 h^3
Mpc^-3. Our results confirm the usefulness of the halo model for gaining
physical insight into the patterns of galaxy clustering.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:00:01 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 09:21:16 GMT"
}
] | 2010-05-25T00:00:00 | [
[
"Blake",
"Chris",
""
],
[
"Collister",
"Adrian",
""
],
[
"Lahav",
"Ofer",
""
]
] |
0704.3378 | Rainer Schmidt | Rainer Schmidt, Andrew W. Brinkman | Studies of the temperature and frequency dependent impedance of an
electroceramic functional oxide thermistor | null | Advanced Functional Materials, 2007 | 10.1002/adfm.200600878 | null | cond-mat.mtrl-sci cond-mat.str-el | null | The charge transport mechanism and the macroscopic dielectric constant in
polycrystalline device materials commonly exhibit several components such as
electrode-sample interface, grain boundary and bulk contributions. In order to
gain precise understanding of the functionality of polycrystalline
electroceramic device materials it is essential to deconvolute these
contributions. The paradigm of functional thermistor ceramics based on thick
film spinel manganates has been studied by temperature dependent alternating
current impedance spectroscopy. Three typical relaxation phenomena were
detected, which all showed a separated temperature dependence of resistivity
consistent with thermally activated charge transport. The dominating grain
boundary and the interface contributions exhibited distinctively different
capacitance allowing clear identification. The composite nature of the
dielectric properties in polycrystalline functional ceramics was emphasized,
and impedance spectroscopy was shown to be a powerful tool to account for and
model such behaviour.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:07:30 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Schmidt",
"Rainer",
""
],
[
"Brinkman",
"Andrew W.",
""
]
] |
0704.3379 | Lionel Berard Bergery | Cyriaque Atindogbe (IECN), Lionel B\'erard Bergery (IECN) | $A^\nabla$-tensors on lightlike hypersurfaces | soumis | null | null | null | math.DG | null | This paper introduces $\anabla$-tensors on lightlike hypersurfaces $M^{n+1}$
of signature $(0,n)$, $(n\geq 1)$ and investigates on their properties in
connection with the null geometry of $M$. In particular, we show that there is
an interplay between existence of $\anabla$-tensors of certain type and
lightlike warped product structures.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:23:04 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Atindogbe",
"Cyriaque",
"",
"IECN"
],
[
"Bergery",
"Lionel Bérard",
"",
"IECN"
]
] |
0704.3380 | Katherine J. Inskip | K.J. Inskip, M. Villar-Martin, C. Tadhunter, R. Morganti, J. Holt, D.
Dicken | VIMOS spectroscopy of extended emission line regions | 4 pages, 2 figures. Conference proceedings to appear in "The Central
Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M. Wang (San
Francisco: ASP) | null | null | null | astro-ph | null | We present the results of spectroscopic and imaging observations of the FRII
radio galaxies PKS2250-41 and PKS1932-46. Both sources display very extensive
emission line regions, and appear to be undergoing interactions with companion
bodies. In addition to disturbed gas kinematics associated with interactions
with the radio source, the more distant emitting material displays simple,
narrow emission line profiles, often at significant velocity offsets from the
system rest-frame, and may be associated with tidal debris.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:28:05 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Inskip",
"K. J.",
""
],
[
"Villar-Martin",
"M.",
""
],
[
"Tadhunter",
"C.",
""
],
[
"Morganti",
"R.",
""
],
[
"Holt",
"J.",
""
],
[
"Dicken",
"D.",
""
]
] |
0704.3381 | Guoce Xin | Guoce Xin | Determinant Formulas Relating to Tableaux of Bounded Height | 15 pages, 4 figures | null | null | null | math.CO math.AC | null | Chen et al. recently established bijections for $(d+1)$-noncrossing/
nonnesting matchings, oscillating tableaux of bounded height $d$, and
oscillating lattice walks in the $d$-dimensional Weyl chamber. Stanley asked
what is the total number of such tableaux of length $n$ and of any shape. We
find a determinant formula for the exponential generating function. The same
idea applies to prove Gessel's remarkable determinant formula for permutations
with bounded length of increasing subsequences. We also give short algebraic
derivations for some results of the reflection principle.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:33:43 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Xin",
"Guoce",
""
]
] |
0704.3382 | Lionel Berard Bergery | Cyriaque Atindogbe (IECN), Lionel B\'erard Bergery (IECN) | A note on conformal connections on lightlike hypersurfaces | null | Conformal Geometry and Dynamics 11 (10/01/2007) 1-11 | null | null | math.DG | null | Degenerate submanifolds of pseudo-Riemannian manifolds are quite difficult to
study because there is no prefered connection when the submanifold is not
totally geodesic. For the particular case of degenerate totally umbilical
hypersurfaces, we show that there are "Weyl" connections adapted to the induced
structure on the hypersurface. We begin the study of these with their holonomy.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:34:01 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Atindogbe",
"Cyriaque",
"",
"IECN"
],
[
"Bergery",
"Lionel Bérard",
"",
"IECN"
]
] |
0704.3383 | Lionel Berard Bergery | Cyriaque Atindogbe (IECN), Lionel B\'erard Bergery (IECN) | Einstein-Weyl structures on lightike hypersurfaces | soumis | null | null | null | math.DG | null | We study Weyl structures on lightlikes hypersurfaces endowed with a conformal
structure of certain type and specific screen distribution: the Weyl screen
structures. We investigate various differential geometric properties of
Einstein-Weyl screen structures on lightlike hypersurfaces and show that, for
ambiant Lorentzian space $\mathbb{R}^{n+2}_{1}$ and a totally umbilical screen
foliation, there is a strong interplay with the induced (Riemannian)
Weyl-structure on the leaves. Finally, we establish necessary and sufficient
conditions for a Weyl structure defined by the $1-$form of an almost contact
structure given by an additional complex structure in case of an ambiant
Kaehler manifold to be closed.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:35:15 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Atindogbe",
"Cyriaque",
"",
"IECN"
],
[
"Bergery",
"Lionel Bérard",
"",
"IECN"
]
] |
0704.3384 | Michael R. Pennington | M.R. Pennington and D.J. Wilson | Decay channels and charmonium mass-shifts | 4 pages, 2 figures Revised version: (1) corrected 2 typos in Table
II, (2) additional text in penultimate paragraph to clarify the calculation
of mass-shifts for $\eta_c'$ and $\eta_c"$. We thank colleagues for pointing
out confusing wording of previous text | Phys.Rev.D76:077502,2007 | 10.1103/PhysRevD.76.077502 | DCPT/07/28, IPPP/07/14 | hep-ph | null | The discovery in the last few years of the $X, Y$ and $Z$ states of the
extended charmonium family has highlighted the importance of the closeness of
decay channels to an understanding of these mesons. We aid this debate by
illustrating a simple calculational procedure for including the effect of open
and nearby closed channels.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:36:30 GMT"
},
{
"version": "v2",
"created": "Wed, 2 May 2007 08:09:24 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pennington",
"M. R.",
""
],
[
"Wilson",
"D. J.",
""
]
] |
0704.3385 | Luis A. Martinez-Vaquero | Luis A. Martinez-Vaquero (UAM), Gustavo Yepes (UAM) and Yehuda Hoffman
(Hebrew University) | Constrained simulations of the local universe: I. Mass and motion in the
Local Volume | 10 pages, 19 figures. Accepted for publication in MNRAS | Mon.Not.Roy.Astron.Soc.378:1601-1608,2007 | 10.1111/j.1365-2966.2007.11907.x | null | astro-ph | null | It has been recently claimed that there is no correlation between the
distribution of galaxies and their peculiar velocities within the Local Volume
(LV), namely a sphere of R=7/h Mpc around the Local Group (LG). It has been
then stated that this implies that either locally dark matter is not
distributed in the same way as luminous matter, or peculiar velocities are not
due to fluctuations in mass. To test that statement a set of constrained N-body
cosmological simulations, designed to reproduce the main observed large scale
structure, have been analyzed. The simulations were performed within the
flat-Lambda, open and flat matter only CDM cosmogonies. Two unconstrained
simulations of the flat-Lambda and open CDM models were performed for
comparison. LG-like objects have been selected so as to mimic the real LG
environment. The local gravitational field due to all halos found within each
LV is compared with the exact gravitational field induced by all matter in the
simulation. We conclude that there is no correlation between the exact and the
local gravitational field obtained by pairwise newtonian forces between halos.
Moreover, the local gravitational field is uncorrelated with the peculiar
velocities of halos. The exact gravitational field has a linear correlation
with peculiar velocities but the proportionality constant relating the velocity
with gravitational field falls below the prediction of the linear theory. Upon
considering all matter inside the LVs, the exact and local gravitational
accelerations show a much better correlation, but with a considerable scatter
independent on the cosmological models. The main conclusion is that the lack of
correlation between the local gravitation and the peculiar velocity fields
around LG-like objects is naturally expected in the CDM cosmologies.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:40:36 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Martinez-Vaquero",
"Luis A.",
"",
"UAM"
],
[
"Yepes",
"Gustavo",
"",
"UAM"
],
[
"Hoffman",
"Yehuda",
"",
"Hebrew University"
]
] |
0704.3386 | Yusuke Sasano | Yusuke Sasano | Four-dimensional Painlev\'e systems of types $D_5^{(1)}$ and $B_4^{(1)}$ | 19 pages, 6 figures | null | null | null | math.AG | null | We find and study a five-parameter family of four-dimensional coupled
Painlev\'e V systems with affine Weyl group symmetry of type $D_5^{(1)}$. We
then give an explicit description of a confluence from those systems to a
four-parameter family of four-dimensional coupled Painlev\'e III systems with
affine Weyl group symmetry of type $B_4^{(1)}$.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:48:31 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Apr 2007 08:52:03 GMT"
},
{
"version": "v3",
"created": "Tue, 1 May 2007 06:58:20 GMT"
},
{
"version": "v4",
"created": "Mon, 7 May 2007 15:43:10 GMT"
},
{
"version": "v5",
"created": "Thu, 10 May 2007 01:10:58 GMT"
},
{
"version": "v6",
"created": "Mon, 24 Mar 2008 07:23:16 GMT"
}
] | 2008-03-24T00:00:00 | [
[
"Sasano",
"Yusuke",
""
]
] |
0704.3387 | Gelu Popescu | Gelu Popescu | Noncommutative Berezin transforms and model theory | 41 pages | null | null | null | math.FA math.OA | null | We initiate the study of a class of noncommutative domains of n-tuples of
bounded linear operators on a Hilbert space, which is generated by certain
positivity conditions on polynomials in n noncommutative indeterminates. We
obtain Fatou type results, functional calculi, and a model theory for n-tuples
of operators in these domains. The main role in this study is played by a class
of noncommutative Berezin transforms which is introduced in this paper. Our
results extend to noncommutative varieties.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:48:52 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Popescu",
"Gelu",
""
]
] |
0704.3388 | Stefan Friedl | Stefan Friedl, Constance Leidy and Laurentiu Maxim | L^2-Betti numbers of plane algebraic curves | Final version. To be published by the Michigan Mathematical Journal.
12 pages | Michigan Math. J. 58 (2009), no. 2, 411-421 | null | null | math.GT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In [DJL07] it was shown that if A is an affine hyperplane arrangement in C^n,
then at most one of the L^2-Betti numbers of its complement is non--zero. We
will prove an analogous statement for complements of any algebraic curve in
C^2. Furthermore we also recast and extend results of [LM06] in terms of
L^2-Betti numbers.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 14:59:17 GMT"
},
{
"version": "v2",
"created": "Thu, 12 Jun 2008 14:30:48 GMT"
}
] | 2016-05-24T00:00:00 | [
[
"Friedl",
"Stefan",
""
],
[
"Leidy",
"Constance",
""
],
[
"Maxim",
"Laurentiu",
""
]
] |
0704.3389 | \'Eric Brunet | E. Brunet, B. Derrida, A. H. Mueller, S. Munier | Effect of selection on ancestry: an exactly soluble case and its
phenomenological generalization | 26 pages | null | 10.1103/PhysRevE.76.041104 | null | cond-mat.dis-nn | null | We consider a family of models describing the evolution under selection of a
population whose dynamics can be related to the propagation of noisy traveling
waves. For one particular model, that we shall call the exponential model, the
properties of the traveling wave front can be calculated exactly, as well as
the statistics of the genealogy of the population. One striking result is that,
for this particular model, the genealogical trees have the same statistics as
the trees of replicas in the Parisi mean-field theory of spin glasses. We also
find that in the exponential model, the coalescence times along these trees
grow like the logarithm of the population size. A phenomenological picture of
the propagation of wave fronts that we introduced in a previous work, as well
as our numerical data, suggest that these statistics remain valid for a larger
class of models, while the coalescence times grow like the cube of the
logarithm of the population size.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:09:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brunet",
"E.",
""
],
[
"Derrida",
"B.",
""
],
[
"Mueller",
"A. H.",
""
],
[
"Munier",
"S.",
""
]
] |
0704.3390 | Stefan Friedl | Stefan Friedl | Realizations of Seifert matrices by hyperbolic knots | 4 pages, to be published by the Journal of Knot Theory and its
Ramifications | null | null | null | math.GT | null | Recently Kearton showed that any Seifert matrix of a knot is S--equivalent to
the Seifert matrix of a prime knot. We show in this note that such a matrix is
in fact S--equivalent to the Seifert matrix of a hyperbolic knot. This result
follows from reinterpreting this problem in terms of Blanchfield pairings and
by applying results of Kawauchi.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:07:18 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Friedl",
"Stefan",
""
]
] |
0704.3391 | Zhu Han | Zhu Han and H. Vincent Poor | Lifetime Improvement in Wireless Sensor Networks via Collaborative
Beamforming and Cooperative Transmission | Invited paper to appear in the IEE Proceedings: Microwaves, Antennas
and Propagation, Special Issue on Antenna Systems and Propagation for Future
Wireless Communications | null | null | null | cs.IT math.IT | null | Collaborative beamforming (CB) and cooperative transmission (CT) have
recently emerged as communication techniques that can make effective use of
collaborative/cooperative nodes to create a virtual
multiple-input/multiple-output (MIMO) system. Extending the lifetime of
networks composed of battery-operated nodes is a key issue in the design and
operation of wireless sensor networks. This paper considers the effects on
network lifetime of allowing closely located nodes to use CB/CT to reduce the
load or even to avoid packet-forwarding requests to nodes that have critical
battery life. First, the effectiveness of CB/CT in improving the signal
strength at a faraway destination using energy in nearby nodes is studied.
Then, the performance improvement obtained by this technique is analyzed for a
special 2D disk case. Further, for general networks in which
information-generation rates are fixed, a new routing problem is formulated as
a linear programming problem, while for other general networks, the cost for
routing is dynamically adjusted according to the amount of energy remaining and
the effectiveness of CB/CT. From the analysis and the simulation results, it is
seen that the proposed method can reduce the payloads of energy-depleting nodes
by about 90% in the special case network considered and improve the lifetimes
of general networks by about 10%, compared with existing techniques.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:14:32 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Apr 2007 02:49:33 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Han",
"Zhu",
""
],
[
"Poor",
"H. Vincent",
""
]
] |
0704.3392 | Helmut H\"olzler | Helmut H\"olzler | World Graph Formalism for Feynman Amplitudes | 35 pages, 7 figures. Added DFG project details. Added further
comments on some topics; omitted some well-known material. v4: Added a
citation; shortened some passages | JHEP 0809:022,2008 | 10.1088/1126-6708/2008/09/022 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A unified treatment of Schwinger parametrised Feynman amplitudes is suggested
which addresses vertices of arbitrary order on the same footing as propagators.
Contributions from distinct diagrams are organised collectively. The scheme is
based on the continuous graph Laplacian. The analogy to a classical statistical
diffusion system of vector charges on the graph is explored.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:14:42 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Apr 2007 08:09:05 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Apr 2008 22:28:48 GMT"
},
{
"version": "v4",
"created": "Tue, 19 Aug 2008 20:46:22 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Hölzler",
"Helmut",
""
]
] |
0704.3393 | Artur Lopes O. | Diogo A. Gomes and Artur O. Lopes | Exponential decay of correlation for the Stochastic Process associated
to the Entropy Penalized Method | null | null | null | null | math.DS math-ph math.MP | null | In this paper we present an upper bound for the decay of correlation for the
stationary stochastic process associated with the Entropy Penalized Method. Let
$L(x, v):\Tt^n\times\Rr^n\to \Rr$ be a Lagrangian of the form
L(x,v) = {1/2}|v|^2 - U(x) + < P, v>.
For each value of $\epsilon $ and $h$, consider the operator
\Gg[\phi](x):= -\epsilon h {ln}[\int_{\re^N} e
^{-\frac{hL(x,v)+\phi(x+hv)}{\epsilon h}}dv], as well as the reversed operator
\bar \Gg[\phi](x):= -\epsilon h {ln}[\int_{\re^N}
e^{-\frac{hL(x+hv,-v)+\phi(x+hv)}{\epsilon h}}dv], both acting on continuous
functions $\phi:\Tt^n\to \Rr$. Denote by $\phi_{\epsilon,h} $ the solution of
$\Gg[\phi_{\epsilon,h}]=\phi_{\epsilon,h}+\lambda_{\epsilon,h}$, and by $\bar
\phi_{\epsilon,h} $ the solution of $\bar \Gg[\phi_{\epsilon,h}]=\bar
\phi_{\epsilon,h}+\lambda_{\epsilon,h}$. In order to analyze the decay of
correlation for this process we show that the operator $ {\cal L} (\phi) (x) =
\int e^{- \frac{h L (x,v)}{\epsilon}} \phi(x+h v) d v,$ has a maximal
eigenvalue isolated from the rest of the spectrum.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:36:40 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Gomes",
"Diogo A.",
""
],
[
"Lopes",
"Artur O.",
""
]
] |
0704.3394 | Piotr Zycki | P. T. Zycki, A. Niedzwiecki, M. A. Sobolewska | Modelling the energy dependencies of high-frequency QPO in black hole
X-ray binaries | 8 pages, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.11917.x | null | astro-ph | null | We model energy dependencies of the quasi periodic oscillations (QPO) in the
model of disc epicyclic motions, with X-ray modulation caused by varying
relativistic effects. The model was proposed to explain the high frequency QPO
observed in X-ray binaries. We consider two specific scenarios for the geometry
of accretion flow and spectral formation. Firstly, a standard cold accretion
disc with an active X-ray emitting corona is assumed to oscillate. Secondly,
only a hot X-ray emitting accretion flow oscillates, while the cold disc is
absent at the QPO radius. We find that the QPO spectra are generally similar to
the spectrum of radiation emitted at the QPO radius, and they are broadened by
the relativistic effects. In particular, the QPO spectrum contains the disc
component in the oscillating disc with a corona scenario. We also review the
available data on energy dependencies of high frequency QPO, and we point out
that they appear to lack the disc component in their energy spectra. This would
suggest the hot flow geometry in the spectral states when high frequency QPO
are observed.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:42:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zycki",
"P. T.",
""
],
[
"Niedzwiecki",
"A.",
""
],
[
"Sobolewska",
"M. A.",
""
]
] |
0704.3395 | Marko A. Rodriguez | Marko A. Rodriguez | General-Purpose Computing on a Semantic Network Substrate | null | Emergent Web Intelligence: Advanced Semantic Technologies,
Advanced Information and Knowledge Processing series, Springer-Verlag, pages
57-104, ISBN:978-1-84996-076-2, June 2010 | null | LA-UR-07-2885 | cs.AI cs.PL | http://creativecommons.org/licenses/publicdomain/ | This article presents a model of general-purpose computing on a semantic
network substrate. The concepts presented are applicable to any semantic
network representation. However, due to the standards and technological
infrastructure devoted to the Semantic Web effort, this article is presented
from this point of view. In the proposed model of computing, the application
programming interface, the run-time program, and the state of the computing
virtual machine are all represented in the Resource Description Framework
(RDF). The implementation of the concepts presented provides a practical
computing paradigm that leverages the highly-distributed and standardized
representational-layer of the Semantic Web.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:37:52 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 20:08:21 GMT"
},
{
"version": "v3",
"created": "Sun, 7 Oct 2007 21:44:01 GMT"
},
{
"version": "v4",
"created": "Sun, 6 Jun 2010 05:29:22 GMT"
}
] | 2010-06-08T00:00:00 | [
[
"Rodriguez",
"Marko A.",
""
]
] |
0704.3396 | Zhu Han | Zhu Han and H. Vincent Poor | Lifetime Improvement of Wireless Sensor Networks by Collaborative
Beamforming and Cooperative Transmission | to appear, in the proceedings of IEEE International Conference on
Communications, Glasgow, Scotland, 24-28 June 2007 | null | null | null | cs.IT math.IT | null | Extending network lifetime of battery-operated devices is a key design issue
that allows uninterrupted information exchange among distributive nodes in
wireless sensor networks. Collaborative beamforming (CB) and cooperative
transmission (CT) have recently emerged as new communication techniques that
enable and leverage effective resource sharing among collaborative/cooperative
nodes. In this paper, we seek to maximize the lifetime of sensor networks by
using the new idea that closely located nodes can use CB/CT to reduce the load
or even avoid packet forwarding requests to nodes that have critical battery
life. First, we study the effectiveness of CB/CT to improve the signal strength
at a faraway destination using energy in nearby nodes. Then, a 2D disk case is
analyzed to assess the resulting performance improvement. For general networks,
if information-generation rates are fixed, the new routing problem is
formulated as a linear programming problem; otherwise, the cost for routing is
dynamically adjusted according to the amount of energy remaining and the
effectiveness of CB/CT. From the analysis and simulation results, it is seen
that the proposed schemes can improve the lifetime by about 90% in the 2D disk
network and by about 10% in the general networks, compared to existing schemes.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:55:27 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Han",
"Zhu",
""
],
[
"Poor",
"H. Vincent",
""
]
] |
0704.3397 | Can-Ming Hu | Y. S. Gui, N. Mecking, and C. -M. Hu | Quantized spin excitations in a ferromagnetic microstrip from microwave
photovoltage measurements | 4 pages, 3 figures | Phys. Rev. Lett., 98, 217603 (2007) | 10.1103/PhysRevLett.98.217603 | null | cond-mat.str-el cond-mat.other | null | Quantized spin excitations in a single ferromagnetic microstrip have been
measured using the microwave photovoltage technique. Several kinds of spin wave
modes due to different contributions of the dipole-dipole and the exchange
interactions are observed. Among them are a series of distinct dipole-exchange
spin wave modes, which allow us to determine precisely the subtle spin boundary
condition. A comprehensive picture for quantized spin excitations in a
ferromagnet with finite size is thereby established. The dispersions of the
quantized spin wave modes have two different branches separated by the
saturation magnetization.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 16:07:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gui",
"Y. S.",
""
],
[
"Mecking",
"N.",
""
],
[
"Hu",
"C. -M.",
""
]
] |
0704.3398 | Omer Egecioglu | Omer Egecioglu, Timothy Redmond, Charles Ryavec | Almost Product Evaluation of Hankel Determinants | 58 pages, Version 3: Section 6.2 updated | null | null | null | math.CO | null | An extensive literature exists describing various techniques for the
evaluation of Hankel determinants. The prevailing methods such as Dodgson
condensation, continued fraction expansion, LU decomposition, all produce
product formulas when they are applicable. We mention the classic case of the
Hankel determinants with binomial entries ${3k+2 \choose k}$ and those with
entries ${3k \choose k}$; both of these classes of Hankel determinants have
product form evaluations. The intermediate case, ${3k+1 \choose k}$ has not
been evaluated. There is a good reason for this: these latter determinants do
not have product form evaluations.
In this paper we evaluate the Hankel determinant of ${3k+1 \choose k}$. The
evaluation is a sum of a small number of products, an almost product.
The method actually provides more, and as applications, we present the
salient points for the evaluation of a number of other Hankel determinants with
polynomial entries, along with product and almost product form evaluations at
special points.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:57:42 GMT"
},
{
"version": "v2",
"created": "Thu, 26 Apr 2007 18:12:27 GMT"
},
{
"version": "v3",
"created": "Sat, 12 May 2007 21:59:12 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Egecioglu",
"Omer",
""
],
[
"Redmond",
"Timothy",
""
],
[
"Ryavec",
"Charles",
""
]
] |
0704.3399 | Zhu Han | Zhu Han, Xin Zhang, and H. Vincent Poor | Cooperative Transmission Protocols with High Spectral Efficiency and
High Diversity Order Using Multiuser Detection and Network Coding | to appear, in the proceedings of IEEE International Conference on
Communications, Glasgow, Scotland, 24-28 June 2007 | null | 10.1109/ICC.2007.698 | null | cs.IT math.IT | null | Cooperative transmission is an emerging communication technique that takes
advantages of the broadcast nature of wireless channels. However, due to low
spectral efficiency and the requirement of orthogonal channels, its potential
for use in future wireless networks is limited. In this paper, by making use of
multiuser detection (MUD) and network coding, cooperative transmission
protocols with high spectral efficiency, diversity order, and coding gain are
developed. Compared with the traditional cooperative transmission protocols
with single-user detection, in which the diversity gain is only for one source
user, the proposed MUD cooperative transmission protocols have the merits that
the improvement of one user's link can also benefit the other users. In
addition, using MUD at the relay provides an environment in which network
coding can be employed. The coding gain and high diversity order can be
obtained by fully utilizing the link between the relay and the destination.
From the analysis and simulation results, it is seen that the proposed
protocols achieve higher diversity gain, better asymptotic efficiency, and
lower bit error rate, compared to traditional MUD and to existing cooperative
transmission protocols.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 15:58:10 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Han",
"Zhu",
""
],
[
"Zhang",
"Xin",
""
],
[
"Poor",
"H. Vincent",
""
]
] |
0704.3400 | Wojciech De Roeck | Wojciech De Roeck | Large deviation generating function for energy transport in the
Pauli-Fierz model | 26 pages, 0 figures. v2 --> v3 major changes in notation and
presentation. proofs have been made more compact | null | null | null | math-ph cond-mat.stat-mech math.MP | null | We consider a finite quantum system coupled to quasifree thermal reservoirs
at different temperatures. Under the assumptions of small coupling and
exponential decay of the reservoir correlation function, the large deviation
generating function of energy transport into the reservoirs is shown to be
analytic on a bounded set. Our method is different from the spectral
deformation technique which was employed recently in the study of
spin-boson-like models. As a corollary, we derive the Gallavotti-Cohen
fluctuation relation for the entropy production and a central limit theorem for
energy transport.
| [
{
"version": "v1",
"created": "Wed, 25 Apr 2007 16:59:39 GMT"
},
{
"version": "v2",
"created": "Sun, 29 Apr 2007 18:32:49 GMT"
},
{
"version": "v3",
"created": "Wed, 14 Nov 2007 20:27:30 GMT"
}
] | 2007-11-14T00:00:00 | [
[
"De Roeck",
"Wojciech",
""
]
] |
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