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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.0214 | Kenjiro Gomes | Kenjiro K. Gomes, Abhay N. Pasupathy, Aakash Pushp, Shimpei Ono,
Yoichi Ando, Ali Yazdani | Visualizing pair formation on the atomic scale in the high-Tc
superconductor Bi2Sr2CaCu2O8+d | null | Nature 447, 569 (2007) | 10.1038/nature05881 | null | cond-mat.supr-con cond-mat.str-el | null | Pairing of electrons in conventional superconductors occurs at the
superconducting transition temperature Tc, creating an energy gap D in the
electronic density of states (DOS). In the high-Tc superconductors, a partial
gap in the DOS exists for a range of temperatures above Tc. A key question is
whether the gap in the DOS above Tc is associated with pairing, and what
determines the temperature at which incoherent pairs form. Here we report the
first spatially resolved measurements of gap formation in a high-Tc
superconductor, measured on Bi2Sr2CaCu2O8+d samples with different Tc values
(hole concentration of 0.12 to 0.22) using scanning tunnelling microscopy. Over
a wide range of doping from 0.16 to 0.22 we find that pairing gaps nucleate in
nanoscale regions above Tc. These regions proliferate as the temperature is
lowered, resulting in a spatial distribution of gap sizes in the
superconducting state. Despite the inhomogeneity, we find that every pairing
gap develops locally at a temperature Tp, following the relation 2D/kBTp = 8.
At very low doping (<0.14), systematic changes in the DOS indicate the presence
of another phenomenon, which is unrelated and perhaps competes with electron
pairing. Our observation of nanometre-sized pairing regions provides the
missing microscopic basis for understanding recent reports of fluctuating
superconducting response above Tc in hole-doped high-Tc copper oxide
superconductors.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 20:36:32 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Gomes",
"Kenjiro K.",
""
],
[
"Pasupathy",
"Abhay N.",
""
],
[
"Pushp",
"Aakash",
""
],
[
"Ono",
"Shimpei",
""
],
[
"Ando",
"Yoichi",
""
],
[
"Yazdani",
"Ali",
""
]
] |
0706.0215 | Alard | C. Alard | Gravitational arcs as a perturbation of the perfect ring | 9 pages, 2 figures | null | 10.1111/j.1745-3933.2007.00391.x | null | astro-ph | null | The image of a point situated at the center of a circularly symmetric
potential is a perfect circle. The perturbative effect of non-symmetrical
potential terms is to displace and break the perfect circle. These 2 effects,
displacement and breaking are directly related to the Taylor expansion of the
perturbation at first order on the circle. The numerical accuracy of this
perturbative approach is tested in the case of an elliptical potential with a
core radius. The contour of the images and the caustics lines are well
re-produced by the perturbative approach. These results suggests that the
modeling of arcs, and in particular of tangential arcs may be simplified by
using a general perturbative representation on the circle. An interesting
feature of the perturbative approach, is that the equation of the caustic line
depends only on the values on the circle of the lens displacement field along
the $\theta$ direction.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 01:04:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alard",
"C.",
""
]
] |
0706.0216 | Skenderis Kostas | Kostas Skenderis and Marika Taylor | Anatomy of bubbling solutions | 67 pages, 6 figures; v2: typos corrected, refs added; v3: expanded
explanations, more typos corrected | JHEP 0709:019,2007 | 10.1088/1126-6708/2007/09/019 | ITFA-2007-17 | hep-th | null | We present a comprehensive analysis of holography for the bubbling solutions
of Lin-Lunin-Maldacena. These solutions are uniquely determined by a coloring
of a 2-plane, which was argued to correspond to the phase space of free
fermions. We show that in general this phase space distribution does not
determine fully the 1/2 BPS state of N=4 SYM that the gravitational solution is
dual to, but it does determine it enough so that vevs of all single trace 1/2
BPS operators in that state are uniquely determined to leading order in the
large N limit. These are precisely the vevs encoded in the asymptotics of the
LLM solutions. We extract these vevs for operators up to dimension 4 using
holographic renormalization and KK holography and show exact agreement with the
field theory expressions.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 09:26:33 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Sep 2007 13:11:13 GMT"
},
{
"version": "v3",
"created": "Fri, 23 May 2008 08:31:29 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Skenderis",
"Kostas",
""
],
[
"Taylor",
"Marika",
""
]
] |
0706.0217 | Akin Wingerter | S. Raby, A. Wingerter | Can String Theory Predict the Weinberg Angle? | 35 pages, 6 figures | Phys.Rev.D76:086006,2007 | 10.1103/PhysRevD.76.086006 | OHSTPY-HEP-T-07-002 | hep-th hep-ph | null | We investigate whether the hypercharge assignments in the Standard Model can
be interpreted as a hint at Grand Unification in the context of heterotic
string theory. To this end, we introduce a general method to calculate U(1)_Y
for any heterotic orbifold and compare our findings to the cases where
hypercharge arises from a GUT. Surprisingly, in the overwhelming majority of
3-2 Standard Models, a non-anomalous hypercharge direction can be defined, for
which the spectrum is vector-like. For these models, we calculate sin^2 theta
to see how well it agrees with the standard GUT value. We find that 12% have
sin^2 theta = 3/8, while all others have values which are less. Finally, 89% of
the models with sin^2 theta = 3/8 have U(1)_Y in SU(5).
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:34:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Raby",
"S.",
""
],
[
"Wingerter",
"A.",
""
]
] |
0706.0218 | Stephen R. Sharpe | Stephen R. Sharpe | Future of Chiral Extrapolations with Domain Wall Fermions | Extended version of talk given at workshop on ``Domain Wall Fermions
at Ten Years'', Riken-BNL Research Center, 3/07. 22 pages, 3 figures | null | null | null | hep-lat | null | I discuss the constraints on the lattice spacing, a, the quark masses, m, the
box size, L, and particularly the residual mass, m_res, such that one can
successfully calculate phenomenologically interesting quantities using Domain
Wall fermions (DWF). The constraints on a, m, and L are largely common with
other improved fermion discretizations, and I emphasize that the improved
chiral symmetry of DWF does not remove the need for simulations with a
significant range of lattice parameters. Concerning m_res, I compare the
analysis of chiral symmetry breaking to that with Wilson fermions, emphasizing
that DWF are better than simply Wilson fermions with each chiral symmetry
breaking effect reduced by a common factor. I then discuss the impact of
non-zero m_res both on generic hadronic quantities, and on matrix elements
which involve mixing with lower dimension operators.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 21:05:05 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Sharpe",
"Stephen R.",
""
]
] |
0706.0219 | Yuval Peres | J. van den Berg, Y. Peres, V. Sidoravicius and M.E. Vares | Random spatial growth with paralyzing obstacles | 28 pages, to appear in Annales IHP (Probab. Stat.) | null | null | null | math.PR | null | We study models of spatial growth processes where initially there are sources
of growth (indicated by the colour green) and sources of a growth-stopping
(paralyzing) substance (indicated by red). The green sources expand and may
merge with others (there is no `inter-green' competition). The red substance
remains passive as long as it is isolated. However, when a green cluster comes
in touch with the red substance, it is immediately invaded by the latter, stops
growing and starts to act as red substance itself. In our main model space is
represented by a graph, of which initially each vertex is randomly green, red
or white (vacant), and the growth of the green clusters is similar to that in
first-passage percolation. The main issues we investigate are whether the model
is well-defined on an infinite graph (e.g. the $d$-dimensional cubic lattice),
and what can be said about the distribution of the size of a green cluster just
before it is paralyzed. We show that, if the initial density of red vertices is
positive, and that of white vertices is sufficiently small, the model is indeed
well-defined and the above distribution has an exponential tail. In fact, we
believe this to be true whenever the initial density of red is positive. This
research also led to a relation between invasion percolation and critical
Bernoulli percolation which seems to be of independent interest.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 21:06:05 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Dec 2007 01:27:15 GMT"
}
] | 2007-12-17T00:00:00 | [
[
"Berg",
"J. van den",
""
],
[
"Peres",
"Y.",
""
],
[
"Sidoravicius",
"V.",
""
],
[
"Vares",
"M. E.",
""
]
] |
0706.0220 | Troy Porter | T. A. Porter, W. B. Atwood, B. Baughman, and R. P. Johnson | A Monte Carlo Study of the Irreducible Background in the EGRET
Instrument | Contribution to the 30th ICRC, Merida, Mexico | null | null | null | astro-ph | null | The diffuse extragalactic gamma-ray background (EGRB) has been derived by
various groups from observations by the Energetic Gamma Ray Experiment
Telescope (EGRET) instrument on the Compton Gamma Ray Observatory (CGRO). The
derived EGRB consists of gamma rays that may come from astrophysical
components, such as from unresolved extragalactic point sources (blazars,
normal galaxies, etc.), true extragalactic diffuse emission, misattributed
diffuse signals from the Galaxy and other celestial sources, and an irreducible
instrumental background due to gamma rays produced by cosmic-ray (CR)
interactions in the EGRET instrument. Using the Gamma Ray Large Area Space
Telescope (GLAST) simulation and reconstruction software, we have investigated
the magnitude of the irreducible instrumental background in the GLAST Large
Area Telescope. We re-scale our results to the EGRET and present preliminary
results of our study and its effect on current estimates of the EGRB.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 21:13:07 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Porter",
"T. A.",
""
],
[
"Atwood",
"W. B.",
""
],
[
"Baughman",
"B.",
""
],
[
"Johnson",
"R. P.",
""
]
] |
0706.0221 | Troy Porter | T. A. Porter, S. W. Digel, I. A. Grenier, I. V. Moskalenko and A. W.
Strong (for the GLAST-LAT Collaboration) | The Diffuse Galactic Gamma-Ray Emission Model for GLAST LAT | Contribution to the 30th ICRC, Merida, Mexico (final version) | Proc. 30th ICRC (Merida), 2, 521-524 (2007) | null | null | astro-ph | null | Diffuse emission from the Milky Way dominates the gamma-ray sky. About 80% of
the high-energy luminosity of the Milky Way comes from processes in the
interstellar medium. The Galactic diffuse emission traces interactions of
energetic particles, primarily protons and electrons, with the interstellar gas
and radiation field, thus delivering information about cosmic-ray spectra and
interstellar mass in distant locations. Additionally, the Galactic diffuse
emission is the celestial foreground for the study of gamma-ray point sources
and the extragalactic diffuse gamma-ray emission. We report on the latest
developments in the modelling of the Galactic diffuse emission, which will be
used for the Gamma Ray Large Area Space Telescope (GLAST) investigations.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 21:19:27 GMT"
},
{
"version": "v2",
"created": "Wed, 15 Aug 2007 22:18:44 GMT"
}
] | 2009-02-25T00:00:00 | [
[
"Porter",
"T. A.",
"",
"for the GLAST-LAT Collaboration"
],
[
"Digel",
"S. W.",
"",
"for the GLAST-LAT Collaboration"
],
[
"Grenier",
"I. A.",
"",
"for the GLAST-LAT Collaboration"
],
[
"Moskalenko",
"I. V.",
"",
"for the GLAST-LAT Collaboration"
],
[
"Strong",
"A. W.",
"",
"for the GLAST-LAT Collaboration"
]
] |
0706.0222 | Rutwig C. Stursberg | R. Campoamor-Stursberg | Non-solvable contractions of semisimple Lie algebras in low dimension | 21 pages. 2 Tables, 2 figures | J.Phys.A40:5355-5372,2007 | 10.1088/1751-8113/40/20/008 | null | hep-th | null | The problem of non-solvable contractions of Lie algebras is analyzed. By
means of a stability theorem, the problem is shown to be deeply related to the
embeddings among semisimple Lie algebras and the resulting branching rules for
representations. With this procedure, we determine all deformations of
indecomposable Lie algebras having a nontrivial Levi decomposition onto
semisimple Lie algebras of dimension $n\leq 8$, and obtain the non-solvable
contractions of the latter class of algebras.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 21:30:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Campoamor-Stursberg",
"R.",
""
]
] |
0706.0223 | Yuval Peres | Yuval Peres and Wilhelm Schlag | Two Erdos problems on lacunary sequences: Chromatic number and
Diophantine approximation | 9 pages | null | 10.1112/blms/bdp126 | null | math.CO math.NT | null | Let ${n_k}$ be an increasing lacunary sequence, i.e., $n_{k+1}/n_k>1+r$ for
some $r>0$. In 1987, P. Erdos asked for the chromatic number of a graph $G$ on
the integers, where two integers $a,b$ are connected by an edge iff their
difference $|a-b|$ is in the sequence ${n_k}$. Y. Katznelson found a connection
to a Diophantine approximation problem (also due to Erdos): the existence of
$x$ in $(0,1)$ such that all the multiples $n_j x$ are at least distance
$\delta(x)>0$ from the set of integers. Katznelson bounded the chromatic number
of $G$ by $Cr^{-2}|\log r|$. We apply the Lov\'asz local lemma to establish
that $\delta(x)>cr|\log r|^{-1}$ for some $x$, which implies that the chromatic
number of $G$ is at most $Cr^{-1} |\log r|$. This is sharp up to the
logarithmic factor.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 21:39:34 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Peres",
"Yuval",
""
],
[
"Schlag",
"Wilhelm",
""
]
] |
0706.0224 | Rosemary Mardling | Rosemary A. Mardling | Long-term tidal evolution of short-period planets with companions | 25 pages, 19 figures. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12500.x | null | astro-ph | null | Of the fourteen transiting extrasolar planetary systems for which radii have
been measured, at least three appear to be considerably larger than theoretical
estimates suggest. It has been proposed by Bodenheimer, Lin & Mardling that
undetected companions acting to excite the orbital eccentricity are responsible
for these oversized planets, as they find new equilibrium radii in response to
being tidally heated. In the case of HD 209458, this hypothesis has been
rejected by some authors because there is no sign of such a companion at the 5
m/s level, and because it is difficult to say conclusively that the
eccentricity is non-zero. Transit timing analysis [...]. Whether or not a
companion is responsible for the large radius of HD 209458b, almost certainly
some short-period systems have companions which force their eccentricities to
nonzero values. This paper is dedicated to quantifying this effect.
The eccentricity of a short-period planet will only be excited as long as its
(non-resonant) companion's eccentricity is non-zero. Here we show that the
latter decays on a timescale which depends on the structure of the interior
planet, a timescale which is often shorter than the lifetime of the system.
This includes Earth-mass planets in the habitable zones of some stars. We
determine which configurations are capable of sustaining significant
eccentricity for at least the age of the system, and show that these include
systems with companion masses as low as a fraction of an Earth mass. The
orbital parameters of such companions are consistent with recent calculations
which show that the migration process can induce the formation of low mass
planets external to the orbits of hot Jupiters. Systems with inflated planets
are therefore good targets in the search for terrestrial planets.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 21:40:48 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 05:45:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mardling",
"Rosemary A.",
""
]
] |
0706.0225 | Qiang Li | Qiang Li and C. N. Georghiades | On the End-to-End Distortion for a Buffered Transmission over Fading
Channel | null | null | null | null | cs.IT math.IT | null | In this paper, we study the end-to-end distortion/delay tradeoff for a
analogue source transmitted over a fading channel. The analogue source is
quantized and stored in a buffer until it is transmitted. There are two extreme
cases as far as buffer delay is concerned: no delay and infinite delay. We
observe that there is a significant power gain by introducing a buffer delay.
Our goal is to investigate the situation between these two extremes. Using
recently proposed \emph{effective capacity} concept, we derive a closed-form
formula for this tradeoff. For SISO case, an asymptotically tight upper bound
for our distortion-delay curve is derived, which approaches to the infinite
delay lower bound as $\mathcal{D}_\infty \exp(\frac{C}{\tau_n})$, with $\tau_n$
is the normalized delay, $C$ is a constant. For more general MIMO channel, we
computed the distortion SNR exponent -- the exponential decay rate of the
expected distortion in the high SNR regime. Numerical results demonstrate that
introduction of a small amount delay can save significant transmission power.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 21:40:59 GMT"
}
] | 2007-07-13T00:00:00 | [
[
"Li",
"Qiang",
""
],
[
"Georghiades",
"C. N.",
""
]
] |
0706.0226 | Jianglai Liu | Jianglai Liu, Robert D. McKeown, and Michael J. Ramsey-Musolf | Global Analysis of Nucleon Strange Form Factors at Low $Q^2$ | 8 pages, 1 figure | Phys.Rev.C76:025202,2007 | 10.1103/PhysRevC.76.025202 | null | nucl-ex | null | We perform a global analysis of all recent experimental data from elastic
parity-violating electron scattering at low $Q^2$. The values of the electric
and magnetic strange form factors of the nucleon are determined at $Q^2 = 0.1$
GeV/$c^2$ to be $G^s_E = -0.008 \pm 0.016$ and $G^s_M = 0.29 \pm 0.21$.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:09:29 GMT"
},
{
"version": "v2",
"created": "Sat, 23 Jun 2007 01:35:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Liu",
"Jianglai",
""
],
[
"McKeown",
"Robert D.",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
]
] |
0706.0227 | Martin Weigel | Martin Weigel and Michel J. P. Gingras | Zero-temperature phase of the XY spin glass in two dimensions: Genetic
embedded matching heuristic | 18 pages, RevTex 4, moderately revised version as published | Phys. Rev. B 77, 104437 (2008) | 10.1103/PhysRevB.77.104437 | null | cond-mat.dis-nn cond-mat.stat-mech | null | For many real spin-glass materials, the Edwards-Anderson model with
continuous-symmetry spins is more realistic than the rather better understood
Ising variant. In principle, the nature of an occurring spin-glass phase in
such systems might be inferred from an analysis of the zero-temperature
properties. Unfortunately, with few exceptions, the problem of finding
ground-state configurations is a non-polynomial problem computationally, such
that efficient approximation algorithms are called for. Here, we employ the
recently developed genetic embedded matching (GEM) heuristic to investigate the
nature of the zero-temperature phase of the bimodal XY spin glass in two
dimensions. We analyze bulk properties such as the asymptotic ground-state
energy and the phase diagram of disorder strength vs. disorder concentration.
For the case of a symmetric distribution of ferromagnetic and antiferromagnetic
bonds, we find that the ground state of the model is unique up to a global O(2)
rotation of the spins. In particular, there are no extensive degeneracies in
this model. The main focus of this work is on an investigation of the
excitation spectrum as probed by changing the boundary conditions. Using
appropriate finite-size scaling techniques, we consistently determine the
stiffness of spin and chiral domain walls and the corresponding fractal
dimensions. Most noteworthy, we find that the spin and chiral channels are
characterized by two distinct stiffness exponents and, consequently, the system
displays spin-chirality decoupling at large length scales. Results for the
overlap distribution do not support the possibility of a multitude of
thermodynamic pure states.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:04:57 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Dec 2007 09:32:23 GMT"
},
{
"version": "v3",
"created": "Mon, 28 Apr 2008 13:55:56 GMT"
}
] | 2008-04-28T00:00:00 | [
[
"Weigel",
"Martin",
""
],
[
"Gingras",
"Michel J. P.",
""
]
] |
0706.0228 | Stefano De Leo | Stefano De Leo, Gisele C. Ducati | Quaternionic Wave Packets | 9 pages, 1 figure | J. Math. Phys. 48, 025111-10 (2007) | 10.1063/1.2738362 | null | math-ph math.MP | null | We compare the behavior of a wave packet in the presence of a complex and a
pure quaternionic potential step. This analysis, done for a gaussian
convolution function, sheds new light on the possibility to recognize
quaternionic deviations from standard quantum mechanics.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:29:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"De Leo",
"Stefano",
""
],
[
"Ducati",
"Gisele C.",
""
]
] |
0706.0229 | Christopher Haydock | Christopher Haydock | Conformational gel analysis and graphics: Measurement of side chain
rotational isomer populations by NMR and molecular mechanics | 9 pages, 6 figures, REVTeX v4 | null | null | null | physics.bio-ph | null | Conformational gel analysis and graphics systematically identifies and
evaluates plausible alternatives to the side chain conformations found by
conventional peptide or protein structure determination methods. The proposed
analysis determines the populations of side chain rotational isomers and the
probability distribution of these populations. The following steps are repeated
for each side chain of a peptide or protein: first, extract the local molecular
mechanics of side chain rotational isomerization from a single representative
global conformation; second, expand the predominant set of rotational isomers
to include all probable rotational isomers down to those that constitute just a
small percentage of the population; and third, evaluate the constraints vicinal
coupling constants and NOESY cross relaxation rates place on rotational isomer
populations. In this article we apply conformational gel analysis to the cobalt
glycyl-leucine dipeptide and detail the steps necessary to generalize the
analysis to other amino acid side chains in other peptides and proteins. For a
side chain buried within a protein interior, it is noteworthy that the set of
probable rotational isomers may contain one or more rotational isomers that are
not identified by conventional NMR structure determination methods. In cases
such as this the conformational gel graphics fully accounts for the interplay
of molecular mechanics and NMR data constraints on the population estimates.
The analysis is particularly suited to identifying side chain rotational
isomers that constitute a small percentage of the population, but nevertheless
might be structurally and functionally very significant.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 01:28:58 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Haydock",
"Christopher",
""
]
] |
0706.0230 | Stefano De Leo | Stefano De Leo, Pietro Rotelli | Dirac Equation Studies in the Tunnelling Energy Zone | 12 pages, 4 figures | Eur.Phys.J.C51:241-247,2007 | 10.1140/epjc/s10052-007-0297-4 | null | hep-th | null | We investigate the tunnelling zone V0 < E < V0+m for a one-dimensional
potential within the Dirac equation. We find the appearance of superluminal
transit times akin to the Hartman effect.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:34:53 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"De Leo",
"Stefano",
""
],
[
"Rotelli",
"Pietro",
""
]
] |
0706.0231 | Xiao Liu | Xiao Liu | On the Vacuum Propagation of Gravitational Waves | 7 pages | null | null | null | hep-th | null | We show that, for any local, causal quantum field theory which couples
covariantly to gravity, and which admits Minkowski spacetime vacuum(a)
invariant under the inhomogeneous proper orthochronous Lorentz group, plane
gravitational waves propagating in such Minkowski vacuum(a) do not dissipate
energy or momentum via quantum field theoretic effects.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:49:58 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 18:48:07 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Liu",
"Xiao",
""
]
] |
0706.0232 | Tai-Fu Feng | Chong-Xing Yue, Shuang Zhao, Wei Ma | Single production of the doubly charged scalar in the littlest Higgs
model | Latex, 17 pages, 7 figures; revised version, adding some references
and correcting some typos | Nucl.Phys.B784:36-48,2007 | 10.1016/j.nuclphysb.2007.06.003 | null | hep-ph | null | Single production of the doubly charged scalars $\Phi^{\pm\pm}$ via
$e\gamma$, $ep$ and $pp$ collisions is studied in the context of the little
Higgs$(LH)$ model. Our numerical results show that the new particles
$\Phi^{\pm\pm}$ can be abundantly produced and their possible signatures should
be detected in future high energy linear $e^{+}e^{-}$ collider$(ILC)$. The
cross section for single production of $\Phi^{\pm\pm}$ at the $LHC$ is much
smaller than that at the $ILC$ or the $THERA$.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:36:35 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jun 2007 03:07:11 GMT"
},
{
"version": "v3",
"created": "Wed, 13 Jun 2007 03:24:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yue",
"Chong-Xing",
""
],
[
"Zhao",
"Shuang",
""
],
[
"Ma",
"Wei",
""
]
] |
0706.0233 | Pedro Lacerda | Rita K. Mann, David Jewitt, Pedro Lacerda | Fraction of Contact Binary Trojan Asteroids | 13 pages, 19 figures, and 4 tables. Accepted for publication in AJ
(2007 May 22) | Astron.J.134:1133-1144,2007 | 10.1086/520328 | null | astro-ph | null | We present the results of an optical lightcurve survey of 114 Jovian Trojan
asteroids conducted to determine the fraction of contact binaries.
Sparse-sampling was used to assess the photometric range of the asteroids and
those showing the largest ranges were targeted for detailed follow-up
observations. This survey led to the discovery of two Trojan asteroids, (17365)
and (29314) displaying large lightcurve ranges (~1 magnitude) and long rotation
periods (< 2 rotations per day consistent with a contact binary nature. The
optical lightcurves of both asteroids are well matched by Roche binary
equilibrium models. Using these binary models, we find low densities of ~600
kg/m^3 and 800 kg/m^3, suggestive of porous interiors. The fraction of contact
binaries is estimated to be between 6% and 10%, comparable to the fraction in
the Kuiper Belt. The total binary fraction in the Trojan clouds (including both
wide and close pairs) must be higher.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:40:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mann",
"Rita K.",
""
],
[
"Jewitt",
"David",
""
],
[
"Lacerda",
"Pedro",
""
]
] |
0706.0234 | Robert Carls | Robert Carls, David Lubicz | A p-adic quasi-quadratic point counting algorithm | 32 pages | null | null | null | math.NT math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we give an algorithm for the computation of the number of
rational points on the Jacobian variety of a generic ordinary hyperelliptic
curve defined over a finite field of cardinality $q$ with time complexity
$O(n^{2+o(1)})$ and space complexity $O(n^2)$, where $n=\log(q)$. In the latter
complexity estimate the genus and the characteristic are assumed as fixed. Our
algorithm forms a generalization of both, the AGM algorithm of J.-F. Mestre and
the canonical lifting method of T. Satoh. We canonically lift a certain
arithmetic invariant of the Jacobian of the hyperelliptic curve in terms of
theta constants. The theta null values are computed with respect to a
semi-canonical theta structure of level $2^\nu p$ where $\nu >0$ is an integer
and $p=\mathrm{char}(\F_q)>2$. The results of this paper suggest a global
positive answer to the question whether there exists a quasi-quadratic time
algorithm for the computation of the number of rational points on a generic
ordinary abelian variety defined over a finite field.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:44:18 GMT"
},
{
"version": "v2",
"created": "Tue, 6 Nov 2007 23:31:57 GMT"
},
{
"version": "v3",
"created": "Fri, 27 Jun 2008 11:57:46 GMT"
}
] | 2008-06-27T00:00:00 | [
[
"Carls",
"Robert",
""
],
[
"Lubicz",
"David",
""
]
] |
0706.0235 | Thomas Haxton | Thomas K. Haxton, Andrea J. Liu | Activated dynamics and effective temperature in a steady state sheared
glass | 4 pages, 2 figures. Revised to include additional data. Inherent
structure energy results were included, and much of the shear transformation
zone discussion was removed | Phys. Rev. Lett. 99, 195701 (2007) | 10.1103/PhysRevLett.99.195701 | null | cond-mat.soft | null | We conduct nonequilibrium molecular dynamics simulations to measure the shear
stress, the average inherent structure energy, and the effective temperature
$T_{eff}$ of a sheared model glass as a function of bath temperature $T$ and
shear strain rate. For $T$ above the glass transition temperature $T_0$, the
rheology approaches a Newtonian limit and $T_{eff}$ approaches $T$ as the
strain rate approaches zero, while for $T<T_0$, the shear stress approaches a
yield stress and $T_{eff}$ approaches a limiting value near $T_0$. In the
shear-dominated regime at high $T$, high strain rate or at low $T$, we find
that the shear stress and the average inherent structure energy each collapse
onto a single curve as a function of $T_{eff}$. This indicates that $T_{eff}$
is controlling behavior in this regime.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:44:26 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Oct 2007 14:12:19 GMT"
}
] | 2010-06-18T00:00:00 | [
[
"Haxton",
"Thomas K.",
""
],
[
"Liu",
"Andrea J.",
""
]
] |
0706.0236 | Gerald Hoehn | Gerald Hoehn | Selbstduale Vertexoperatorsuperalgebren und das Babymonster (Self-dual
Vertex Operator Super Algebras and the Baby Monster) | 91 pages with 1 figure and 5 tables; Ph.D. thesis, Bonn University,
1995; in German; LaTeX 2.09. An English translation appears in the future
under the same paper number as version 2 | Bonner Mathematische Schriften, Vol. 286, 1-85, Bonn 1996 | null | null | math.QA math.GR | null | We investigate self-dual vertex operator algebras (VOAs) and super algebras
(SVOAs). Using the genus one correlation functions, it is shown that self-dual
SVOAs exist only for half-integral central charges. It is described how
self-dual SVOAs can be constructed from self-dual VOAs of larger central
charge. The analogy with integral lattices and binary codes is emphasized.
One main result is the construction of the shorter Moonshine module, a
self-dual SVOA of central charge 23.5 on which the Baby monster - the second
largest sporadic simple group - acts by automorphisms. The shorter Moonshine
module has the character q^(-47/48)*(1+ 4371q^(3/2)+ 96256q^2+ 1143745q^(5/2)
+...) and is the "shorter cousin" of the Moonshine module. Its lattice and code
analog are the shorter Leech lattice and shorter Golay code. We conjecture that
the shorter Moonshine module is the unique SVOA with this character.
The final chapter introduces the notion of extremal VOAs and SVOAs. These are
self-dual (S)VOAs with character having the same first few coefficients as the
vacuum representation of the Virasoro algebra of the same central charge. We
show that extremal VOAs exist at least for the central charges 8, 16, 24, 32,
40 and that extremal SVOAs exist only for the central charges c=0.5, 1, ...,
7.5, 8, 12, 14, 15, 15.5, 23.5 and 24. Examples for c=24 (resp. 23.5) are the
(shorter) Moonshine module. Again, our results are similar to results known for
codes and lattices.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 19:48:33 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Hoehn",
"Gerald",
""
]
] |
0706.0237 | Ali Nassimi | Ali Mohammad Nassimi | Quantum Mechanics in Phase Space | null | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The basics of the Wigner formulation of Quantum-Mechanics and few related
interpretational issues are presented in a simple language.
This formulation has extensive applications in Quantum Optics and in Mixed
Quantum-Classical formulations.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 22:58:27 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jun 2008 19:05:37 GMT"
}
] | 2008-06-11T00:00:00 | [
[
"Nassimi",
"Ali Mohammad",
""
]
] |
0706.0238 | Ryan Mallery | Ryan P. Mallery, Lisa Kewley, R. Michael Rich, Samir Salim, Stephane
Charlot, Christy Tremonti, Mark Seibert, Todd Small, Ted Wyder, Tom A.
Barlow, Karl Forster, Peter G. Friedman, D. Christopher Martin, Patrick
Morrissey, Susan G. Neff, David Schiminovich, Luciana Bianchi, Jose Donas,
Timothy Heckman, Young-Wook Lee, Barry F. Madore, Bruno Milliard, Alex S.
Szalay, Barry Y. Welsh, Suk Young Yi | Nitrogen Production in Starburst Galaxies Detected by GALEX | 18 pages, 7 figues, 5 tables, Accepted to ApJ | null | 10.1086/518833 | null | astro-ph | null | We investigate the production of nitrogen in star forming galaxies with
ultraviolet (UV) radiation detected by the Galaxy Evolution Explorer Satellite
(GALEX). We use a sample of 8,745 GALEX emission line galaxies matched to the
Sloan Digital Sky Survey (SDSS) spectroscopic sample. We derive both gas-phase
oxygen and nitrogen abundances for the sample, and apply stellar population
synthesis models to derive stellar masses and star formation histories of the
galaxies. We compare oxygen abundances derived using three different
diagnostics. We derive the specific star formation rates of the galaxies by
modeling the 7-band GALEX+SDSS photometry. We find that galaxies that have log
SFR/M$_*$ > -10.0 typically have values of log N/O ~0.05 dex less than galaxies
with log SFR/M$_*$ < -10.0 and similar oxygen abundances.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 23:20:33 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 22:27:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mallery",
"Ryan P.",
""
],
[
"Kewley",
"Lisa",
""
],
[
"Rich",
"R. Michael",
""
],
[
"Salim",
"Samir",
""
],
[
"Charlot",
"Stephane",
""
],
[
"Tremonti",
"Christy",
""
],
[
"Seibert",
"Mark",
""
],
[
"Small",
"Todd",
""
],
[
"Wyder",
"Ted",
""
],
[
"Barlow",
"Tom A.",
""
],
[
"Forster",
"Karl",
""
],
[
"Friedman",
"Peter G.",
""
],
[
"Martin",
"D. Christopher",
""
],
[
"Morrissey",
"Patrick",
""
],
[
"Neff",
"Susan G.",
""
],
[
"Schiminovich",
"David",
""
],
[
"Bianchi",
"Luciana",
""
],
[
"Donas",
"Jose",
""
],
[
"Heckman",
"Timothy",
""
],
[
"Lee",
"Young-Wook",
""
],
[
"Madore",
"Barry F.",
""
],
[
"Milliard",
"Bruno",
""
],
[
"Szalay",
"Alex S.",
""
],
[
"Welsh",
"Barry Y.",
""
],
[
"Yi",
"Suk Young",
""
]
] |
0706.0239 | Daniele Colosi | Daniele Colosi | Two point function for a simple general relativistic quantum model | null | null | null | null | quant-ph | null | We study the quantum theory of a simple general relativistic quantum model of
two coupled harmonic oscillators and compute the two-point function following a
proposal first introduced in the context of loop quantum gravity.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 23:27:13 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Colosi",
"Daniele",
""
]
] |
0706.0240 | Carsten Klempt | C. Klempt, T. Henninger, O. Topic, J. Will, W. Ertmer, E. Tiemann and
J. Arlt | KRb Feshbach Resonances: Modeling the interatomic potential | 4 pages, 3 figures | Phys. Rev. A 76, 020701(R) (2007) | 10.1103/PhysRevA.76.020701 | null | cond-mat.other | null | We have observed 28 heteronuclear Feshbach resonances in 10 spin combinations
of the hyperfine ground states of a 40K 87Rb mixture. The measurements were
performed by observing the loss rates from an atomic mixture at magnetic fields
between 0 and 700 G. This data was used to significantly refine an interatomic
potential derived from molecular spectroscopy, yielding a highly consistent
model of the KRb interaction. Thus, the measured resonances can be assigned to
the corresponding molecular states. In addition, this potential allows for an
accurate calculation of the energy differences between highly excited levels
and the rovibrational ground level. This information is of particular relevance
for the formation of deeply bound heteronuclear molecules. Finally, the model
is used to predict Feshbach resonances in mixtures of 87Rb combined with 39K or
41K.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 23:32:30 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Jun 2007 17:54:33 GMT"
}
] | 2007-08-23T00:00:00 | [
[
"Klempt",
"C.",
""
],
[
"Henninger",
"T.",
""
],
[
"Topic",
"O.",
""
],
[
"Will",
"J.",
""
],
[
"Ertmer",
"W.",
""
],
[
"Tiemann",
"E.",
""
],
[
"Arlt",
"J.",
""
]
] |
0706.0241 | Thomas Maier | T.A. Maier, A. Macridin, M. Jarrell, D.J. Scalapino | Systematic analysis of a spin-susceptibility representation of the
pairing interaction in the 2D Hubbard model | 5 pages, 5 figures | null | 10.1103/PhysRevB.76.144516 | null | cond-mat.supr-con cond-mat.str-el | null | A dynamic cluster quantum Monte Carlo algorithm is used to study a spin
susceptibility representation of the pairing interaction for the
two-dimensional Hubbard model with an on-site Coulomb interaction equal to the
bandwidth for various doping levels. We find that the pairing interaction is
well approximated by ${3/2}\Ub(T)^2\chi(K-K')$ with an effective temperature
and doping dependent coupling $\Ub(T)$ and the numerically calculated spin
susceptibility $\chi(K-K')$. We show that at low temperatures, $\Ub$ may be
accurately determined from a corresponding spin susceptibility based
calculation of the single-particle self-energy. We conclude that the strength
of the d-wave pairing interaction, characterized by the mean-field transition
temperature, can be determined from a knowledge of the dressed spin
susceptibility and the nodal quasiparticle spectral weight. This has important
implications with respect to the questions of whether spin fluctuations are
responsible for pairing in the high-T$_c$ cuprates.
| [
{
"version": "v1",
"created": "Fri, 1 Jun 2007 23:51:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Maier",
"T. A.",
""
],
[
"Macridin",
"A.",
""
],
[
"Jarrell",
"M.",
""
],
[
"Scalapino",
"D. J.",
""
]
] |
0706.0242 | Germ\'an Cristiani | M.L. Luoni, C.H. Mandrini, G. Cristiani, P. D\'emoulin | The magnetic field topology associated to two M flares | 14 pages, 7 figures | Adv.SpaceRes.39:1382-1388,2007 | 10.1016/j.asr.2007.02.005 | null | astro-ph | null | On 27 October, 2003, two GOES M-class flares occurred in the lapse of three
hours in active region NOAA 10486. The two flares were confined and their
associated brightenings appeared at the same location, displaying a very
similar shape both at the chromospheric and coronal levels. We focus on the
analysis of magnetic field (SOHO/MDI), chromospheric (HASTA, Kanzelhoehe Solar
Observatory, TRACE) and coronal (TRACE) observations. By combining our data
analysis with a model of the coronal magnetic field, we compute the magnetic
field topology associated to the two M flares. We find that both events can be
explained in terms of a localized magnetic reconnection process occurring at a
coronal magnetic null point. This null point is also present at the same
location one day later, on 28 October, 2003. Magnetic energy release at this
null point was proposed as the origin of a localized event that occurred
independently with a large X17 flare on 28 October, 2003, at 11:01 UT. The
three events, those on 27 October and the one on 28 October, are homologous.
Our results show that coronal null points can be stable topological structures
where energy release via magnetic reconnection can happen, as proposed by
classical magnetic reconnection models.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 00:22:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Luoni",
"M. L.",
""
],
[
"Mandrini",
"C. H.",
""
],
[
"Cristiani",
"G.",
""
],
[
"Démoulin",
"P.",
""
]
] |
0706.0243 | Yuri Bazlov | Yuri Bazlov, Arkady Berenstein | Braided doubles | v3: minor misprints corrected | null | null | null | math.QA math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Braided doubles provide a unifying framework for classical and quantum
universal enveloping algebras and rational Cherednik algebras. They are a class
of algebras with triangular decomposition, arising from a deformation problem,
the solutions to which are called quasi-Yetter-Drinfeld modules. A basic family
of quasi-YD modules is provided by braidings (matrices satisfying the quantum
Yang-Baxter equation); these give rise to quantum versions of the Weyl algebra,
where the role of polynomial rings is played by Nichols-Woronowicz algebras.
Rational Cherednik algebras for t = 0 emerge as subalgebras in doubles of
Nichols-Woronowicz algebras. For nonzero t, the Nichols-Woronowicz algebra is
replaced with an algebra associated to the classical Yang-Baxter equation.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 00:49:32 GMT"
},
{
"version": "v2",
"created": "Mon, 5 Nov 2007 23:26:46 GMT"
},
{
"version": "v3",
"created": "Wed, 23 Nov 2011 14:45:22 GMT"
}
] | 2011-11-24T00:00:00 | [
[
"Bazlov",
"Yuri",
""
],
[
"Berenstein",
"Arkady",
""
]
] |
0706.0244 | Oleg Berman | Oleg L. Berman, Yurii E. Lozovik, and Godfrey Gumbs | Bose-Einstein condensation and Superfluidity of magnetoexcitons in
Graphene | 5 pages, 1 figure | null | 10.1103/PhysRevB.77.155433 | null | cond-mat.str-el cond-mat.mes-hall | null | We propose experiments to observe Bose-Einstein condensation (BEC) and
superfluidity of quasi-two-dimensional (2D) spatially indirect magnetoexcitons
in bilayer graphene. The magnetic field $B$ is assumed strong. The energy
spectrum of collective excitations, the sound spectrum as well as the effective
magnetic mass of magnetoexcitons are presented in the strong magnetic field
regime. The superfluid density $n_S$ and the temperature of the
Kosterlitz-Thouless phase transition $T_c$ are shown to be increasing functions
of the excitonic density $n$ but decreasing functions of $B$ and the interlayer
separation $D$. Numerical results are presented from these calculations.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 00:31:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Berman",
"Oleg L.",
""
],
[
"Lozovik",
"Yurii E.",
""
],
[
"Gumbs",
"Godfrey",
""
]
] |
0706.0245 | Hossein Movahhedian | Hossein Movahhedian | Violation of Equalities in Bipartite Qutrits Systems | 10 pages, RevTeX4, final version | Quantum Information and Computation, Vol. 9, No. 1&2 (2009) pp.
90-102 | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have recently shown that for the special case of a bipartite system with
binary inputs and outputs there exist equalities in local theories which are
violated by quantum theory. The amount of white noise tolerated by these
equalities are twice that of inequalities. In this paper we will first
introduce an inequality in bipartite qutrits systems which, if non-maximally
entangled state is used instead of maximally entangled state, is violated more
strongly by quantum theory. Hence reproducing the results obtained in the
literature. We will then prove that our equalities in this case are violated by
quantum theory too, and they tolerate much more white noise than inequalities.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 09:20:34 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 15:50:35 GMT"
},
{
"version": "v3",
"created": "Fri, 16 May 2008 12:24:22 GMT"
},
{
"version": "v4",
"created": "Sat, 17 May 2008 11:38:20 GMT"
},
{
"version": "v5",
"created": "Thu, 16 Oct 2008 03:54:13 GMT"
}
] | 2008-10-16T00:00:00 | [
[
"Movahhedian",
"Hossein",
""
]
] |
0706.0246 | Paulo Tabuada | Giordano Pola, Antoine Girard and Paulo Tabuada | Approximately bisimilar symbolic models for nonlinear control systems | Corrected typos | null | null | null | math.OC | null | Control systems are usually modeled by differential equations describing how
physical phenomena can be influenced by certain control parameters or inputs.
Although these models are very powerful when dealing with physical phenomena,
they are less suitable to describe software and hardware interfacing the
physical world. For this reason there is a growing interest in describing
control systems through symbolic models that are abstract descriptions of the
continuous dynamics, where each "symbol" corresponds to an "aggregate" of
states in the continuous model. Since these symbolic models are of the same
nature of the models used in computer science to describe software and
hardware, they provide a unified language to study problems of control in which
software and hardware interact with the physical world. Furthermore the use of
symbolic models enables one to leverage techniques from supervisory control and
algorithms from game theory for controller synthesis purposes. In this paper we
show that every incrementally globally asymptotically stable nonlinear control
system is approximately equivalent (bisimilar) to a symbolic model. The
approximation error is a design parameter in the construction of the symbolic
model and can be rendered as small as desired. Furthermore if the state space
of the control system is bounded the obtained symbolic model is finite. For
digital control systems, and under the stronger assumption of incremental
input-to-state stability, symbolic models can be constructed through a suitable
quantization of the inputs.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 01:47:09 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 16:54:40 GMT"
},
{
"version": "v3",
"created": "Mon, 14 Jan 2008 04:24:38 GMT"
}
] | 2008-01-14T00:00:00 | [
[
"Pola",
"Giordano",
""
],
[
"Girard",
"Antoine",
""
],
[
"Tabuada",
"Paulo",
""
]
] |
0706.0247 | Stefan Ochsenbein | S. T. Ochsenbein, O. Waldmann, A. Sieber, G. Carver, R. Bircher, H. U.
G\"udel, R. S. G. Davies, G. A. Timco, R. E. P. Winpenny, H. Mutka, F.
Fernandez-Alonso | Standing Spin Waves in an Antiferromagnetic Molecular Cr6 Horseshoe | 6 pages, 6 figures, accepted for publication in Europhysics Letters | null | 10.1209/0295-5075/79/17003 | null | cond-mat.other | null | The antiferromagnetic molecular finite chain Cr6 was studied by inelastic
neutron scattering. The observed magnetic excitations at 2.6 and 4.3 meV
correspond, due to the open boundaries of a finite chain, to standing spin
waves. The determined energy spectrum revealed an essentially classical spin
structure. Hence, various spin-wave theories were investigated in order to
assess their potential for describing the elementary excitations of finite spin
systems.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 02:14:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ochsenbein",
"S. T.",
""
],
[
"Waldmann",
"O.",
""
],
[
"Sieber",
"A.",
""
],
[
"Carver",
"G.",
""
],
[
"Bircher",
"R.",
""
],
[
"Güdel",
"H. U.",
""
],
[
"Davies",
"R. S. G.",
""
],
[
"Timco",
"G. A.",
""
],
[
"Winpenny",
"R. E. P.",
""
],
[
"Mutka",
"H.",
""
],
[
"Fernandez-Alonso",
"F.",
""
]
] |
0706.0248 | Benjamin Steinberg | Karsten Henckell, John Rhodes and Benjamin Steinberg | Aperiodic Pointlikes and Beyond | null | null | null | null | math.GR | null | We prove that if $\pi$ is a recursive set of primes, then pointlike sets are
decidable for the pseudovariety of semigroups whose subgroups are $\pi$-groups.
In particular, when $\pi$ is the empty set, we obtain Henckell's decidability
of aperiodic pointlikes. Our proof, restricted to the case of aperiodic
semigroups, is simpler than the original proof.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 05:00:05 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Jun 2007 03:20:42 GMT"
}
] | 2007-06-17T00:00:00 | [
[
"Henckell",
"Karsten",
""
],
[
"Rhodes",
"John",
""
],
[
"Steinberg",
"Benjamin",
""
]
] |
0706.0249 | Branko Malesevic | Branko J. Malesevic, Ivana V. Jovovic | The Compositions of the Differential Operations and Gateaux Directional
Derivative | Available online at:
http://www.cs.uwaterloo.ca/journals/JIS/vol10.html | Journal of Integer Sequences, Vol.10 (2007), Article 07.8.2, 1-11 | null | null | math.CO | null | In this paper we determine the number of the meaningful compositions of
higher order of the differential operations and Gateaux directional derivative.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 19:48:08 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 21:48:10 GMT"
}
] | 2008-03-12T00:00:00 | [
[
"Malesevic",
"Branko J.",
""
],
[
"Jovovic",
"Ivana V.",
""
]
] |
0706.0250 | Cheng-ping Huang | Cheng-ping Huang and Yong-yuan Zhu | Comment on "Enhanced transmission through periodic arrays of
subwavelength holes: the role of localized waveguide resonances" | 3 pages, 1 figure | null | null | null | physics.optics | null | Comment on "Enhanced transmission through periodic arrays of subwavelength
holes: the role of localized waveguide resonances" [Phys.Rev.Lett. 96, 233901
(2006)]
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 04:51:58 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Huang",
"Cheng-ping",
""
],
[
"Zhu",
"Yong-yuan",
""
]
] |
0706.0251 | Keiichi Nagao | Keiichi Nagao | Ginsparg-Wilson Relation and Admissibility Condition in Noncommutative
Geometry | Latex 4 pages, uses ptptex.cls. Talk given at Nishinomiya-Yukawa
Memorial Symposium on Theoretical Physics ``Noncommutative Geometry and
Quantum Spacetime in Physics", Japan, Nov.11-15, 2006. (To be published in
the Proceedings) | null | 10.1143/PTPS.171.232 | IU-TH-4 | hep-th hep-lat | null | Ginsparg-Wilson relation and admissibility condition have the key role to
construct lattice chiral gauge theories. They are also useful to define the
chiral structure in finite noncommutative geometries or matrix models. We
discuss their usefulness briefly.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 06:11:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nagao",
"Keiichi",
""
]
] |
0706.0252 | David Monniaux | David Monniaux (LIENS) | Applying the Z-transform for the static analysis of floating-point
numerical filters | null | null | null | null | cs.PL cs.NA | null | Digital linear filters are used in a variety of applications (sound
treatment, control/command, etc.), implemented in software, in hardware, or a
combination thereof. For safety-critical applications, it is necessary to bound
all variables and outputs of all filters. We give a compositional, effective
abstraction for digital linear filters expressed as block diagrams, yielding
sound, precise bounds for fixed-point or floating-point implementations of the
filters.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 06:18:48 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Monniaux",
"David",
"",
"LIENS"
]
] |
0706.0253 | Shinki Oyabu | Shinki Oyabu (1), Takehiko Wada (1), Youichi Ohyama (1), Hideo
Matsuhara (1), Toshinobu Takagi (1), Takao Nakagawa (1), Takashi Onaka (2),
Naofumi Fujishiro (1), Daisuke Ishihara (2), Yoshifusa Ita (1), Hirokazu
Kataza (1), Woojung Kim (1), Toshio Matsumoto (1), Hiroshi Murakami (1),
Itsuki Sakon (2), Toshihiko Tanabe (3), Kazunori Uemizu (1), Munetaka Ueno
(4), Fumihiko Usui (1), Hidenori Watarai (5), and Kanae Haze (1)
((1)Institute of Space and Astronautical Science, Japan Aerospace Exploration
Agency, (2)Department of Astronomy, School of Science, University of Tokyo,
(3)Institute of Astronomy, University of Tokyo, (4)Department of Earth
Science and Astronomy, University of Tokyo, (5)Office of Space Applications,
Japan Aerospace Exploration Agency) | Detection of an H-alpha Emission Line on a Quasar, RX J1759.4+6638, at
z=4.3 with AKARI | 9pages, 3 figures, Publications of the Astronomical Society of Japan,
in press | null | 10.1093/pasj/59.sp2.S497 | null | astro-ph | null | We report the detection of an H-alpha emission line in the low resolution
spectrum of a quasar, RX J1759.4+6638, at a redshift of 4.3 with the InfraRed
Camera (IRC) onboard the AKARI. This is the first spectroscopic detection of an
H-alpha emission line in a quasar beyond z=4. The overall spectral energy
distribution (SED) of RX J1759.4+6638 in the near- and mid-infrared wavelengths
agrees with a median SED of the nearby quasars and the flux ratio of
F(Ly-alpha)/F(H-alpha) is consistent with those of previous reports for
lower-redshift quasars.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 06:40:25 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Oyabu",
"Shinki",
""
],
[
"Wada",
"Takehiko",
""
],
[
"Ohyama",
"Youichi",
""
],
[
"Matsuhara",
"Hideo",
""
],
[
"Takagi",
"Toshinobu",
""
],
[
"Nakagawa",
"Takao",
""
],
[
"Onaka",
"Takashi",
""
],
[
"Fujishiro",
"Naofumi",
""
],
[
"Ishihara",
"Daisuke",
""
],
[
"Ita",
"Yoshifusa",
""
],
[
"Kataza",
"Hirokazu",
""
],
[
"Kim",
"Woojung",
""
],
[
"Matsumoto",
"Toshio",
""
],
[
"Murakami",
"Hiroshi",
""
],
[
"Sakon",
"Itsuki",
""
],
[
"Tanabe",
"Toshihiko",
""
],
[
"Uemizu",
"Kazunori",
""
],
[
"Ueno",
"Munetaka",
""
],
[
"Usui",
"Fumihiko",
""
],
[
"Watarai",
"Hidenori",
""
],
[
"Haze",
"Kanae",
""
]
] |
0706.0254 | Rene Lozi | R. Lozi | Giga-Periodic Orbits for Weakly Coupled Tent and Logistic Discretized
Maps | 45 pages, 23 figures, Invited conference of International Conference
on Industrial and Appl. Math., New Delhi, India, 4-6 Dec. 2004 | Modern mathematical models, Methods and Algorithms for Real World
Systems, A.H. Siddiqi, I.S. Duff and O. Christensen (Eds.), Anamaya
Publishers, New delhi, India, 80-14, 2006 | null | null | math.DS | null | We introduce new models of very weakly coupled logistic and tent maps for
which orbits of very long period are found. The length of these periods is far
greater than one billion. The property of these models relatively to the
distribution of the iterated points (invariant measure) is described.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 06:51:14 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Lozi",
"R.",
""
]
] |
0706.0255 | Mehdi Nadjafikhah | Mehdi Nadjafikhah and Ahmad Reza Forough | Self-equivalence 3rd order ODEs by time-fixed transformations | 9 pages, accepted by "Electronic Journal Applied Sciences
(http://www.mathem.pub.ro/apps)" | null | null | Applied Science, 10: 176-183, 2008 | math.DG | null | Let y''' = f(x, y, y', y'') be a 3rd order ODE. By Cartan equivalence method,
we will study the local equivalence problem under the transformations group of
time-fixed coordinates.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 07:24:52 GMT"
},
{
"version": "v2",
"created": "Sat, 26 Jan 2008 08:44:15 GMT"
}
] | 2009-08-26T00:00:00 | [
[
"Nadjafikhah",
"Mehdi",
""
],
[
"Forough",
"Ahmad Reza",
""
]
] |
0706.0256 | Andrzej Madrecki Phd | Andrzej M\c{a}drecki | Proof of generalized Riemann hypothesis for Dedekind zetas and Dirichlet
L-functions | 47 pages | null | null | null | math.GM | null | A short proof of the generalized Riemann hypothesis (gRH in short) for zeta
functions $\zeta_{k}$ of algebraic number fields $k$ - based on the Hecke's
proof of the functional equation for $\zeta_{k}$ and the method of the proof of
the Riemann hypothesis derived in [$M_{A}$] (algebraic proof of the Riemann
hypothesis) is given. The generalized Riemann hypothesis for Dirichlet
L-functions is an immediately consequence of (gRH) for $\zeta_{k}$ and suitable
product formula which connects the Dedekind zetas with L-functions.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 07:54:12 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Mcadrecki",
"Andrzej",
""
]
] |
0706.0257 | Andrzej Okninski | Andrzej Okninski and Boguslaw Radziszewski | Grazing dynamics and dependence on initial conditions in certain systems
with impacts | LaTeX, 17 pages, 5 figures (integrated with the text) | null | null | null | nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamics near the grazing manifold and basins of attraction for a motion of a
material point in a gravitational field, colliding with a moving
motion-limiting stop, are investigated. The Poincare map, describing evolution
from an impact to the next impact, is derived. Periodic points are found and
their stability is determined. The grazing manifold is computed and dynamics is
approximated in its vicinity. It is shown that on the grazing manifold there
are trapping as well as forbidden regions. Finally, basins of attraction are
studied.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 08:53:54 GMT"
},
{
"version": "v2",
"created": "Wed, 26 Dec 2012 19:28:28 GMT"
}
] | 2012-12-27T00:00:00 | [
[
"Okninski",
"Andrzej",
""
],
[
"Radziszewski",
"Boguslaw",
""
]
] |
0706.0258 | Daisuke Jido | D. Jido, T. Hatsuda and T. Kunihiro | In-medium Pions and Partial Restoration of Chiral Symmetry: a
model-independent analysis | 4 pages, Talk given at the Yukawa International Seminar (YKIS) 2006,
"New frontiers in QCD -- Exotic hadrons and hadronic matter", Kyoto, Japan,
20 Nov. - 8 Dec. 2006. To be published in Supplemet of Prog. Theor. Phys | Prog.Theor.Phys.Suppl.168:478-481,2007 | 10.1143/PTPS.168.478 | null | nucl-th | null | Exploiting operator relations in QCD, we derive a novel and model-independent
formula relating the in-medium quark condensate <bar-q q>* to the decay
constant F*_t and the wave function renormalization constant Z* of the pion in
the nuclear medium. Evaluating Z* at low density from the iso-scalar
pion-nucleon scattering data, it is concluded that the enhanced repulsion of
the s-wave isovector pion-nucleusinteraction observed in the deeply bound
pionic atoms implies directly the reduction of the in-medium quark condensate.
The knowlege of the in-medium pion mass is not necessary to reach this
conclusion.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 09:16:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jido",
"D.",
""
],
[
"Hatsuda",
"T.",
""
],
[
"Kunihiro",
"T.",
""
]
] |
0706.0259 | Haijun Zhou | Jie Zhou (ITP-Cas), Hui Ma (ITP-Cas), and Haijun Zhou (ITP-Cas) | Long-range frustration in T=0 first-step replica-symmetry-broken
solutions of finite-connectivity spin glasses | 5 pages, two figures. To be published in JSTAT | null | 10.1088/1742-5468/2007/06/L06001 | null | cond-mat.dis-nn cond-mat.stat-mech | null | In a finite-connectivity spin-glass at the zero-temperature limit, long-range
correlations exist among the unfrozen vertices (whose spin values being
non-fixed). Such long-range frustrations are partially removed through the
first-step replica-symmetry-broken (1RSB) cavity theory, but residual
long-range frustrations may still persist in this mean-field solution. By way
of population dynamics, here we perform a perturbation-percolation analysis to
calculate the magnitude of long-range frustrations in the 1RSB solution of a
given spin-glass system. We study two well-studied model systems, the minimal
vertex-cover problem and the maximal 2-satisfiability problem. This work points
to a possible way of improving the zero-temperature 1RSB mean-field theory of
spin-glasses.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 09:38:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhou",
"Jie",
"",
"ITP-Cas"
],
[
"Ma",
"Hui",
"",
"ITP-Cas"
],
[
"Zhou",
"Haijun",
"",
"ITP-Cas"
]
] |
0706.0260 | Gamal Nashed G.L. | Gamal Gergess Lamee Nashed | Charged Axially Symmetric Solution and Energy in Teleparallel Theory
Equivalent to General Relativity | 15 pages, Latex | Eur.Phys.J.C49:851-857,2007 | 10.1140/epjc/s10052-006-0154-x | null | gr-qc | null | An exact charged solution with axial symmetry is obtained in the teleparallel
equivalent of general relativity (TEGR). The associated metric has the
structure function $G(\xi)=1-{\xi}^2-2mA{\xi}^3-q^2A^2{\xi}^4$. The fourth
order nature of the structure function can make calculations cumbersome. Using
a coordinate transformation we get a tetrad whose metric has the structure
function in a factorisable form $(1-{\xi}^2)(1+r_{+}A\xi)(1+r_{-}A\xi)$ with
$r_{\pm}$ as the horizons of Reissner-Nordstr$\ddot{o}$m space-time. This new
form has the advantage that its roots are now trivial to write down. Then, we
study the singularities of this space-time. Using another coordinate
transformation, we obtain a tetrad field. Its associated metric yields the
Reissner-Nordstr$\ddot{o}$m black hole. In Calculating the energy content of
this tetrad field using the gravitational energy-momentum, we find that the
resulting form depends on the radial coordinate! Using the regularized
expression of the gravitational energy-momentum in the teleparallel equivalent
of general relativity we get a consistent value for the energy.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 09:57:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Nashed",
"Gamal Gergess Lamee",
""
]
] |
0706.0261 | Fatemeh Sadat Tabatabaei Asl | F. S. Tabatabaei, M. Krause, R. Beck | High resolution radio continuum survey of M33: I. The radio maps | 16 pages, 13 figures, accepted for publication in the Astronomy and
Astrophysics Journal | null | 10.1051/0004-6361:20077461 | null | astro-ph | null | We study the exponential scale length of total radio emission, the spectral
index distribution, and the linear radio polarization in the Scd galaxy M33.
Observations were carried out using the 3.6 cm dual channel and the 6.2 cm four
channel receivers of the 100--m Effelsberg telescope along with the L-band VLA
D--array at 20 cm. High spatial resolution and sensitivity in both total and
linearly polarized radio continuum emission from M33 were achieved. We found
considerable extended emission, not only from the main arms I S and I N, but
also from the weaker arms. The large--scale magnetic field exhibits
well--ordered spiral structure with almost the same orientation as that of the
optical spiral arms, however, it does not show a clear structural correlation
or anti--correlation with the optical arms. There is a north-south asymmetry in
polarization that is frequency-dependent. We found that the ring mean spectral
index versus radius increases faster beyond $R$ = 4 kpc. At each wavelength,
the exponential scale length is larger inside than outside $R$ = 4 kpc. From
the larger scales lengths at $R$ $<$ 4 kpc, we conclude that star forming
regions are mainly spread over the region $R$ $<$ 4 kpc without a dominant
nuclear concentration. Furthermore, at $R$ $<$ 4 kpc, a spatial correlation
between cosmic rays and star forming regions may exist. From the behaviour of
the mean spectral indices obtained from different pairs of the radio continuum
data at 3.6, 6.2, and 20 cm, we confirm that a decrease in the thermal fraction
causes an increase in the spectral index. The frequency-dependent asymmetry in
the polarization hints to an asymmetry in Faraday depolarization.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 10:51:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tabatabaei",
"F. S.",
""
],
[
"Krause",
"M.",
""
],
[
"Beck",
"R.",
""
]
] |
0706.0262 | A. Faltenbacher | A. Faltenbacher, Y.P. Jing, Cheng Li, Shude Mao, H.J. Mo, Anna
Pasquali, Frank C. van den Bosch | Spatial and kinematic alignments between central and satellite halos | accepted for publication in ApJ | null | 10.1086/525243 | null | astro-ph | null | Based on a cosmological N-body simulation we analyze spatial and kinematic
alignments of satellite halos within six times the virial radius of group size
host halos (Rvir). We measure three different types of spatial alignment: halo
alignment between the orientation of the group central substructure (GCS) and
the distribution of its satellites, radial alignment between the orientation of
a satellite and the direction towards its GCS, and direct alignment between the
orientation of the GCS and that of its satellites. In analogy we use the
directions of satellite velocities and probe three further types of alignment:
the radial velocity alignment between the satellite velocity and connecting
line between satellite and GCS, the halo velocity alignment between the
orientation of the GCS and satellite velocities and the auto velocity alignment
between the satellites orientations and their velocities. We find that
satellites are preferentially located along the major axis of the GCS within at
least 6 Rvir (the range probed here). Furthermore, satellites preferentially
point towards the GCS. The most pronounced signal is detected on small scales
but a detectable signal extends out to 6 Rvir. The direct alignment signal is
weaker, however a systematic trend is visible at distances < 2 Rvir. All
velocity alignments are highly significant on small scales. Our results suggest
that the halo alignment reflects the filamentary large scale structure which
extends far beyond the virial radii of the groups. In contrast, the main
contribution to the radial alignment arises from the adjustment of the
satellite orientations in the group tidal field. The projected data reveal good
agreement with recent results derived from large galaxy surveys. (abridged)
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 14:01:27 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Dec 2007 10:10:49 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Faltenbacher",
"A.",
""
],
[
"Jing",
"Y. P.",
""
],
[
"Li",
"Cheng",
""
],
[
"Mao",
"Shude",
""
],
[
"Mo",
"H. J.",
""
],
[
"Pasquali",
"Anna",
""
],
[
"Bosch",
"Frank C. van den",
""
]
] |
0706.0263 | Gerard Clement | Adel Bouchareb and Gerard Clement | Black hole mass and angular momentum in topologically massive gravity | 20 pages, references added, version to appear in Classical and
Quantum Gravity | Class.Quant.Grav.24:5581-5594,2007 | 10.1088/0264-9381/24/22/018 | LAPTH-1185/07 | gr-qc hep-th | null | We extend the Abbott-Deser-Tekin approach to the computation of the Killing
charge for a solution of topologically massive gravity (TMG) linearized around
an arbitrary background. This is then applied to evaluate the mass and angular
momentum of black hole solutions of TMG with non-constant curvature
asymptotics. The resulting values, together with the appropriate black hole
entropy, fit nicely into the first law of black hole thermodynamics.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 10:35:59 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 15:54:21 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Sep 2007 11:21:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bouchareb",
"Adel",
""
],
[
"Clement",
"Gerard",
""
]
] |
0706.0264 | Jianda Wu | Jian-da Wu, Mei-sheng Zhao, Jian-lan Chen, and Yong-de Zhang | Adiabatic Approximation Condition | 4 pages, no figures | null | null | null | quant-ph | null | In this paper, we present an invariant perturbation theory of the adiabatic
process based on the concepts of U(1)-invariant adiabatic orbit and
U(1)-invariant adiabatic expansion. As its application, we propose and discuss
new adiabatic approximation conditions.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 11:04:33 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 02:40:56 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Wu",
"Jian-da",
""
],
[
"Zhao",
"Mei-sheng",
""
],
[
"Chen",
"Jian-lan",
""
],
[
"Zhang",
"Yong-de",
""
]
] |
0706.0265 | ChandraShekhar Yadav | C. S. Yadav, A. K. Nigam and A. K. Rastogi | Thermodynamic Properties of Ferromagnetic Mott- Insulators GaV4S8 | To be publish in Physica B | null | 10.1016/j.physb.2007.10.172 | null | cond-mat.str-el cond-mat.mtrl-sci | null | We present the results of the magnetic and specific heat measurements on V4
tetrahedral-cluster compound GaV4S8 between 2 to 300K. We find two transitions
related to a structural change at 42K followed by ferromagnetic order at 12K on
cooling. Remarkably similar properties were previously reported for the cluster
compounds of Mo4. These compounds show an extremely high density of low energy
excitations in their electronic properties. We explain this behavior in a
cluster compound as due to the reduction of coulomb repulsion among electrons
that occupy highly degenerate orbits of different clusters.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 11:16:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yadav",
"C. S.",
""
],
[
"Nigam",
"A. K.",
""
],
[
"Rastogi",
"A. K.",
""
]
] |
0706.0266 | Arthur Useinov | A. N. Useinov, R. G. Deminov, L. R. Tagirov, G. Pan | Giant magnetoresistance in nanoscale ferromagnetic heterocontacts | 10 pages, 4 figures | J. Phys.: Condens. Matter 19 (2007) 196215 | 10.1088/0953-8984/19/19/196215 | null | cond-mat.mes-hall | null | A quasiclassical theory of giant magnetoresistance in nanoscale point
contacts between different ferromagnetic metals is developed. The contacts were
sorted by three types of mutual positions of the conduction spin-subband
bottoms which are shifted one against another by the exchange interaction. A
model of linear domain wall has been used to account for the finite contact
length. The magnetoresistance is plotted against the size of the nanocontact.
In heterocontacts the magnetoresistance effect turned out to be not only
negative, as usual, but can be positive as well. Relevance of the results to
existing experiments on GMR in point heterocontacts is discussed.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 11:35:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Useinov",
"A. N.",
""
],
[
"Deminov",
"R. G.",
""
],
[
"Tagirov",
"L. R.",
""
],
[
"Pan",
"G.",
""
]
] |
0706.0267 | Andrei Nemilentsau | G.Ya. Slepyan, A. Magyarov, S.A. Maksimenko, A. Hoffmann | Microscopic theory of quantum dot interactions with quantum light: local
field effect | 14 pages, 7 figures | PHYSICAL REVIEW B 76, 195328 (2007) | 10.1103/PhysRevB.76.195328 | null | cond-mat.mes-hall | null | A theory of both linear and nonlinear electromagnetic response of a single QD
exposed to quantum light, accounting the depolarization induced local--field
has been developed. Based on the microscopic Hamiltonian accounting for the
electron--hole exchange interaction, an effective two--body Hamiltonian has
been derived and expressed in terms of the incident electric field, with a
separate term describing the QD depolarization. The quantum equations of motion
have been formulated and solved with the Hamiltonian for various types of the
QD excitation, such as Fock qubit, coherent fields, vacuum state of
electromagnetic field and light with arbitrary photonic state distribution. For
a QD exposed to coherent light, we predict the appearance of two oscillatory
regimes in the Rabi effect separated by the bifurcation. In the first regime,
the standard collapse--revivals phenomenon do not reveal itself and the QD
population inversion is found to be negative, while in the second one, the
collapse--revivals picture is found to be strongly distorted as compared with
that predicted by the standard Jaynes-Cummings model. %The model developed can
easily be extended to %%electromagnetic excitation. For the case of QD
interaction with arbitrary quantum light state in the linear regime, it has
been shown that the local field induce a fine structure of the absorbtion
spectrum. Instead of a single line with frequency corresponding to which the
exciton transition frequency, a duplet is appeared with one component shifted
by the amount of the local field coupling parameter. It has been demonstrated
the strong light--mater coupling regime arises in the weak-field limit. A
physical interpretation of the predicted effects has been proposed.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 11:37:29 GMT"
}
] | 2008-05-27T00:00:00 | [
[
"Slepyan",
"G. Ya.",
""
],
[
"Magyarov",
"A.",
""
],
[
"Maksimenko",
"S. A.",
""
],
[
"Hoffmann",
"A.",
""
]
] |
0706.0268 | Yossi Strauss | Y. Strauss | Forward and Backward time observables for quantum evolution and quantum
stochastic processes-I: The time observables | 26 pages, LaTex, no figures | null | null | null | math-ph math.MP quant-ph | null | Given a Hamiltonian $H$ on a Hilbert space $\mathcal H$ it is shown that,
under the assumption that $\sigma(H)=\sigma_{ac}(H)=R^+$, there exist unique
positive operators $T_F$ and $T_B$ registering the Schr\"odinger time evolution
generated by $H$ in the forward (future) direction and backward (past)
direction respectively. These operators may be considered as time observables
for the quantum evolution. Moreover, it is shown that the same operators may
serve as time observables in the construction of quantum stochastic
differential equations and quantum stochastic processes in the framework of the
Hudson-Parthasarathy quantum stochastic calculus. The basic mechanism enabling
for the definition of the time observables originates from the recently
developed semigroup decomposition formalism used in the description of the time
evolution of resonances in quantum mechanical scattering problems.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 11:39:57 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Strauss",
"Y.",
""
]
] |
0706.0269 | Pedro Sacramento | P. D. Sacramento, V. K. Dugaev and V. R. Vieira | Magnetic impurities in a superconductor: Effect of domain walls and
interference | 26 pages, 26 figures (72 in total) | null | 10.1103/PhysRevB.76.014512 | null | cond-mat.supr-con | null | We consider the effect of magnetic impurities, modeled by classical spins, in
a conventional superconductor. We study their effect on the quasiparticles,
specifically on the spin density and local density of states (LDOS). As
previously emphasized, the impurities induce multiple scatterings of the
quasiparticle wave functions leading to complex interference phenomena. Also,
the impurities induce quantum phase transitions in the many-body system.
Previous authors studied the effect of either a small number of impurities
(from one to three) or a finite concentration of impurities, typically in a
disordered distribution. In this work we assume a regular set of spins
distributed inside the superconductor in such a way that the spins are
oriented, forming different types of domain walls, assumed stable. This
situation may be particularly interesting in the context of spin transfer due
to polarized currents traversing the material.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 12:04:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sacramento",
"P. D.",
""
],
[
"Dugaev",
"V. K.",
""
],
[
"Vieira",
"V. R.",
""
]
] |
0706.0270 | Combes Francoise | David L. Block (1,4), Francoise Combes (2), Ivanio Puerari (3),
Kenneth C. Freeman (4), Alan Stockton (5), Gabriela Canalizo (6), Thomas H.
Jarrett (7), Robert Groess (1), Guy Worthey (8), Robert D. Gehrz (9), Charles
E. Woodward (9), Elisha F. Polomski (9) and Giovanni G. Fazio (10) -- ((1)
WITS, South Africa, (2) LERMA, Paris, (3) INAOE, Mexico, (4) Mount Stromlo,
Australia, (5) IfA, Hawaii, (6) IGPP, California, (7) CALTECH, (8) WSU,
Washington, (9) Univ. Minnesota, (10) CfA, Harvard) | Keck spectroscopy and Spitzer Space Telescope analysis of the outer disk
of the Triangulum Spiral Galaxy M33 | 9 pages, 5 figures, accepted in A&A | null | 10.1051/0004-6361:20065908 | null | astro-ph | null | In an earlier study of the spiral galaxy M33, we photometrically identified
arcs or outer spiral arms of intermediate age (0.6 Gyr - 2 Gyr) carbon stars
precisely at the commencement of the HI-warp. Stars in the arcs were
unresolved, but were likely thermally-pulsing asymptotic giant branch carbon
stars. Here we present Keck I spectroscopy of seven intrinsically bright and
red target stars in the outer, northern arc in M33. The target stars have
estimated visual magnitudes as faint as V \sim 25 mag. Absorption bands of CN
are seen in all seven spectra reported here, confirming their carbon star
status. In addition, we present Keck II spectra of a small area 0.5 degree away
from the centre of M33; the target stars there are also identified as carbon
stars. We also study the non-stellar PAH dust morphology of M33 secured using
IRAC on board the Spitzer Space Telescope. The Spitzer 8 micron image attests
to a change of spiral phase at the start of the HI warp. The Keck spectra
confirm that carbon stars may safely be identified on the basis of their red
J-K_s colours in the outer, low metallicity disk of M33. We propose that the
enhanced number of carbon stars in the outer arms are an indicator of recent
star formation, fueled by gas accretion from the HI-warp reservoir.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 11:54:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Block",
"David L.",
""
],
[
"Combes",
"Francoise",
""
],
[
"Puerari",
"Ivanio",
""
],
[
"Freeman",
"Kenneth C.",
""
],
[
"Stockton",
"Alan",
""
],
[
"Canalizo",
"Gabriela",
""
],
[
"Jarrett",
"Thomas H.",
""
],
[
"Groess",
"Robert",
""
],
[
"Worthey",
"Guy",
""
],
[
"Gehrz",
"Robert D.",
""
],
[
"Woodward",
"Charles E.",
""
],
[
"Polomski",
"Elisha F.",
""
],
[
"Fazio",
"Giovanni G.",
""
],
[
"--",
"",
""
]
] |
0706.0271 | Robert Gilman | Robert H. Gilman, Yuri Gurevich and Alexei Miasnikov | A Geometric Zero-One Law | 13 pages | null | null | null | math.LO | null | Each relational structure X has an associated Gaifman graph, which endows X
with the properties of a graph. Suppose that X is infinite, connected and of
bounded degree. A first-order sentence in the language of X is almost surely
true (resp. a.s. false) for finite substructures of X if for every element x in
X, the fraction of substructures of the ball of radius n around x which satisfy
the sentence approaches 1 (resp. 0) as n approaches infinity. Suppose further
that, for every finite substructure, X has a disjoint isomorphic substructure.
Then every sentence is a.s. true or a.s. false for finite substructures of X.
This is one form of the geometric zero-one law. We formulate it also in a form
that does not mention the ambient infinite structure. In addition, we
investigate various questions related to the geometric zero-one law.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 12:38:58 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Gilman",
"Robert H.",
""
],
[
"Gurevich",
"Yuri",
""
],
[
"Miasnikov",
"Alexei",
""
]
] |
0706.0272 | Jean-Marc Couveignes | Jean-Marc Couveignes | Linearizing torsion classes in the Picard group of algebraic curves over
finite fields | To appear in Journal of Algebra | Journal of Algebra, 321(2009), 2085-2118 | 10.1016/j.jalgebra.2008.09.032 | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the problem of computing in the group of $\ell^k$-torsion rational
points of the jacobian variety of algebraic curves over finite fields, with a
view toward computing modular representations.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 14:20:14 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Jan 2009 17:29:50 GMT"
}
] | 2012-05-07T00:00:00 | [
[
"Couveignes",
"Jean-Marc",
""
]
] |
0706.0273 | Hamid Reza Sepangi | B. Vakili and H. R. Sepangi | Generalized uncertainty principle in Bianchi type I quantum cosmology | 8 pages, 3 figures, to appear in PLB | Phys.Lett.B651:79-83,2007 | 10.1016/j.physletb.2007.06.015 | null | gr-qc hep-th | null | We study a quantum Bianchi type I model in which the dynamical variables of
the corresponding minisuperspace obey the generalized Heisenberg algebra. Such
a generalized uncertainty principle has its origin in the existence of a
minimal length suggested by quantum gravity and sting theory. We present
approximate analytical solutions to the corresponding Wheeler-DeWitt equation
in the limit where the scale factor of the universe is small and compare the
results with the standard commutative and noncommutative quantum cosmology.
Similarities and differences of these solutions are also discussed.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 14:30:28 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Jun 2007 11:45:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Vakili",
"B.",
""
],
[
"Sepangi",
"H. R.",
""
]
] |
0706.0274 | Tommaso Giannantonio | Tommaso Giannantonio and Robert Crittenden (Portsmouth U., ICG) | The effect of reionization on the CMB-density correlation | 8 pages, 8 figures | Mon.Not.Roy.Astron.Soc.381:819,2007 | 10.1111/j.1365-2966.2007.12282.x | null | astro-ph | null | In this paper we show how the rescattering of CMB photons after cosmic
reionization can give a significant linear contribution to the
temperature-matter cross-correlation measurements. These anisotropies, which
arise via a late time Doppler effect, are on scales much larger than the
typical scale of non-linear effects at reionization; they can contribute to
degree scale cross-correlations and could affect the interpretation of similar
correlations resulting from the integrated Sachs-Wolfe effect. While expected
to be small at low redshifts, these correlations can be large given a probe of
the density at high redshift, and so could be a useful probe of the cosmic
reionization history.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 16:28:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Giannantonio",
"Tommaso",
"",
"Portsmouth U., ICG"
],
[
"Crittenden",
"Robert",
"",
"Portsmouth U., ICG"
]
] |
0706.0275 | Dimitri Polyakov | Dimitri Polyakov | New Superstring Isometries and Hidden Dimensions | 26 pages typos corrected | Int.J.Mod.Phys.A22:5301-5323,2007 | 10.1142/S0217751X07037299 | null | hep-th | null | We explore the hierarchy of hidden space-time symmetries of noncritical
strings in RNS formalism, realized nonlinearly. Under these symmetry
transformations the variation of the matter part of the RNS action is cancelled
by that of the ghost part. These symmetries, referred to as the
$\alpha$-symmetries, are induced by special space-time generators, violating
the equivalence of ghost pictures. We classify the $\alpha$-symmetry generators
in terms of superconformal ghost cohomologies $H_{n}\sim{H_{-n-2}}(n\geq{0})$
and associate these generators with a chain of hidden space-time dimensions,
with each ghost cohomology $H_{n}\sim{H_{-n-2}}$ ``contributing'' an extra
dimension. Namely, we show that each ghost cohomology $H_{n}\sim{H_{-n-2}}$ of
non-critical superstring theory in $d$-dimensions contains $d+n+1$
$\alpha$-symmetry generators and the generators from
$H_{k}\sim{H_{-k-2}},1\leq{k}\leq{n}$, combined together, extend the space-time
isometry group from the naive $SO(d,2)$ to $SO(d+n,2)$. In the simplest case of
$n=1$ the $\alpha$-generators are identified with the extra symmetries of the
$2T$-physics formalism, also known to originate from a hidden space-time
dimension.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 15:20:06 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 08:52:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Polyakov",
"Dimitri",
""
]
] |
0706.0276 | Pawe{\l} Machnikowski | Pawel Machnikowski, Anna Grodecka, Carsten Weber, Andreas Knorr | Optical control and decoherence of spin qubits in quantum dots | An introductory review paper, presented at the MAG-EL-MAT meeting
2007 | Materials Science-Poland 26, 851 (2008) | null | null | cond-mat.mes-hall | null | We discuss various methods of all-optical spin control in semiconductor
quantum dots. We present different ways of rotating a single confined electron
spin by optical coupling to a trion state. We also discuss a method for
controlling the polarization of a confined exciton via a two-photon transition.
Finally, we analyze the effect of phonon-induced decoherence on the fidelity of
these optical spin control protocols.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 15:48:02 GMT"
}
] | 2013-01-17T00:00:00 | [
[
"Machnikowski",
"Pawel",
""
],
[
"Grodecka",
"Anna",
""
],
[
"Weber",
"Carsten",
""
],
[
"Knorr",
"Andreas",
""
]
] |
0706.0277 | Philipp Tim Reuter | Philipp T. Reuter | A massive high density effective theory | 7 pages, 6 figures | Phys.Rev.D76:125022,2007 | 10.1103/PhysRevD.76.125022 | null | nucl-th | null | We derive an effective theory for dense, cold and massive quark matter. To
this end, we employ a general effective action formalism where antiquarks and
quarks far from the Fermi surface, as well as hard gluons, are integrated out
explicitly. We show that the resulting effective action depends crucially on
the projectors used to separate quarks from antiquarks. If one neglects the
quark masses in these projectors, the Feynman rules of the effective theory
involve quark mass insertions which connect quark with antiquark propagators.
Including the quark masses into these projectors, mass insertions do not appear
and the Feynman rules are identical to those found in the zero-mass limit.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 16:26:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Reuter",
"Philipp T.",
""
]
] |
0706.0278 | Dai Takei | D. Takei, M. Tsujimoto, S. Kitamoto, M. Morii, K. Ebisawa, Y. Maeda,
and E. D. Miller | Detection of a Rare Supersoft Outburst Event during a Suzaku Observation
of 1E0102.2-7219 | 9 pages, 7 figures, 3 tables. PASJ in press | null | 10.1093/pasj/60.sp1.S231 | null | astro-ph | null | We report the detection of a transient X-ray source toward the Small
Magellanic Cloud (SMC) using the X-ray Imaging Spectrometer (XIS) onboard the
Suzaku telescope. The source was detected at the edge of the XIS image during a
routine observation of the calibration source 1E 0102.2-7219, a supernova
remnant in the SMC. We constrained the source position using ray-tracing
simulations. No such transient source was found at the position in the other
Suzaku observations nor in all the available archived images of other X-ray
missions for the last ~28 years. The XIS spectrum can be explained by a single
blackbody with a temperature of ~72 eV, and an interstellar extinction of
~4.9x10^{20} H atoms cm^{-2} consistent with the value to the SMC. An
additional absorption edge at ~0.74 keV was also confirmed, which is presumably
due to the absorption by helium-like oxygen ions. Assuming that the source is
at the distance of the SMC, the X-ray luminosity in the 0.2-2.0 keV band is
~10^{37} erg s^{-1} and the radius of the source is ~10^{8} cm. The XIS light
curve shows about a two-fold decline in X-ray flux during the 24 ks
observation. Together with the archived data, the X-ray flux in the burst is at
least three orders of magnitude brighter than the undetected quiescent level.
All these properties are often seen among supersoft sources (SSSs). We conclude
that the transient source is another example of SSS in the SMC.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 16:35:23 GMT"
}
] | 2017-01-18T00:00:00 | [
[
"Takei",
"D.",
""
],
[
"Tsujimoto",
"M.",
""
],
[
"Kitamoto",
"S.",
""
],
[
"Morii",
"M.",
""
],
[
"Ebisawa",
"K.",
""
],
[
"Maeda",
"Y.",
""
],
[
"Miller",
"E. D.",
""
]
] |
0706.0279 | Kevin Luhman | K. L. Luhman, Lucia Adame, Paola D'Alessio, Nuria Calvet, Kim K.
McLeod, C. J. Bohac, William J. Forrest, Lee Hartmann, B. Sargent, Dan M.
Watson | Hubble and Spitzer Observations of an Edge-on Circumstellar Disk around
a Brown Dwarf | The Astrophysical Journal, in press | Astrophys.J.666:1219-1225,2007 | 10.1086/520712 | null | astro-ph | null | We present observations of a circumstellar disk that is inclined close to
edge-on around a young brown dwarf in the Taurus star-forming region. Using
data obtained with SpeX at the NASA Infrared Telescope Facility, we find that
the slope of the 0.8-2.5 um spectrum of the brown dwarf 2MASS J04381486+2611399
cannot be reproduced with a photosphere reddened by normal extinction. Instead,
the slope is consistent with scattered light, indicating that circumstellar
material is occulting the brown dwarf. By combining the SpeX data with mid-IR
photometry and spectroscopy from the Spitzer Space Telescope and previously
published millimeter data from Scholz and coworkers, we construct the spectral
energy distribution for 2MASS J04381486+2611399 and model it in terms of a
young brown dwarf surrounded by an irradiated accretion disk. The presence of
both silicate absorption at 10 um and silicate emission at 11 um constrains the
inclination of the disk to be ~70 deg, i.e. ~20 deg from edge-on. Additional
evidence of the high inclination of this disk is provided by our detection of
asymmetric bipolar extended emission surrounding 2MASS J04381486+2611399 in
high-resolution optical images obtained with the Hubble Space Telescope.
According to our modeling for the SED and images of this system, the disk
contains a large inner hole that is indicative of a transition disk (R_in~58
R_star~0.275 AU) and is somewhat larger than expected from embryo ejection
models (R_out=20-40 AU vs. R_out<10-20 AU).
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 16:40:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Luhman",
"K. L.",
""
],
[
"Adame",
"Lucia",
""
],
[
"D'Alessio",
"Paola",
""
],
[
"Calvet",
"Nuria",
""
],
[
"McLeod",
"Kim K.",
""
],
[
"Bohac",
"C. J.",
""
],
[
"Forrest",
"William J.",
""
],
[
"Hartmann",
"Lee",
""
],
[
"Sargent",
"B.",
""
],
[
"Watson",
"Dan M.",
""
]
] |
0706.0280 | Tshilidzi Marwala | Evan Hurwitz and Tshilidzi Marwala | Multi-Agent Modeling Using Intelligent Agents in the Game of Lerpa | 32 pages | null | null | null | cs.MA cs.GT | null | Game theory has many limitations implicit in its application. By utilizing
multiagent modeling, it is possible to solve a number of problems that are
unsolvable using traditional game theory. In this paper reinforcement learning
is applied to neural networks to create intelligent agents
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 17:20:21 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Hurwitz",
"Evan",
""
],
[
"Marwala",
"Tshilidzi",
""
]
] |
0706.0281 | Nikolai Ustinov | S.V. Sazonov, N.V. Ustinov | New Kinds of Acoustic Solitons | 9 pages, 1 figure | J. Phys. A: Math. Theor. 40 (2007) F551-F558 | 10.1088/1751-8113/40/26/F06 | null | nlin.SI nlin.PS | null | We find that the modified sine-Gordon equation belonging to the class of the
soliton equations describes the propagation of extremely short transverse
acoustic pulses through the low-temperature crystal containing paramagnetic
impurities with effective spin S=1/2 in the Voigt geometry case. The features
of nonlinear dynamics of strain field and effective spins, which correspond to
the different kinds of acoustic solitons, are studied.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 17:57:00 GMT"
}
] | 2008-03-11T00:00:00 | [
[
"Sazonov",
"S. V.",
""
],
[
"Ustinov",
"N. V.",
""
]
] |
0706.0282 | Bernd Stelzer | Bernd Stelzer (for the CDF Collaboration) | Single Top Results from CDF | Conference Proceedings for Rencontres de Moriond EW 2007 | null | null | null | hep-ex | null | The CDF Collaboration has analyzed 955/pb of CDF II data to search for
electroweak single top quark production at the Tevatron. We employ three
different analysis techniques to search for a single top signal: multivariate
likelihood functions; neural networks; the matrix element analysis technique.
The sensitivities to a single top signal at the rate predicted by the Standard
Model are 2.1 - 2.6 sigma. The first two analyses observe a deficit of single
top-like events and set upper limits on the production cross section. The
matrix element analysis observes a 2.3 sigma single top excess and measures a
combined t-channel and s-channel cross section of 2.7 +1.5-1.3 pb. Using the
same dataset, we have searched for non-Standard Model production of single top
quarks through a heavy W' boson resonance. No evidence for a signal is
observed. We exclude at the 95 % C.L. W' boson production with masses of 760
GeV/c^2 (790 GeV/c^2) in case the right handed neutrino is smaller (larger)
than the mass of the W' boson.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 19:11:10 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Stelzer",
"Bernd",
"",
"for the CDF Collaboration"
]
] |
0706.0283 | Tomasz Stachowiak | Marek Szydlowski, Wlodzimierz Godlowski, Tomasz Stachowiak | Testing and selection of cosmological models with $(1+z)^6$ corrections | 19 pages, 1 figure. Version 2 generally revised and accepted for
publication | Phys.Rev.D77:043530,2008 | 10.1103/PhysRevD.77.043530 | null | gr-qc | null | In the paper we check whether the contribution of $(-)(1+z)^6$ type in the
Friedmann equation can be tested. We consider some astronomical tests to
constrain the density parameters in such models. We describe different
interpretations of such an additional term: geometric effects of Loop Quantum
Cosmology, effects of braneworld cosmological models, non-standard cosmological
models in metric-affine gravity, and models with spinning fluid. Kinematical
(or geometrical) tests based on null geodesics are insufficient to separate
individual matter components when they behave like perfect fluid and scale in
the same way. Still, it is possible to measure their overall effect. We use
recent measurements of the coordinate distances from the Fanaroff-Riley type
IIb (FRIIb) radio galaxy (RG) data, supernovae type Ia (SNIa) data, baryon
oscillation peak and cosmic microwave background radiation (CMBR) observations
to obtain stronger bounds for the contribution of the type considered. We
demonstrate that, while $\rho^2$ corrections are very small, they can be tested
by astronomical observations -- at least in principle. Bayesian criteria of
model selection (the Bayesian factor, AIC, and BIC) are used to check if
additional parameters are detectable in the present epoch. As it turns out, the
$\Lambda$CDM model is favoured over the bouncing model driven by loop quantum
effects. Or, in other words, the bounds obtained from cosmography are very
weak, and from the point of view of the present data this model is
indistinguishable from the $\Lambda$CDM one.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 18:42:54 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 18:20:33 GMT"
},
{
"version": "v3",
"created": "Tue, 11 Mar 2008 12:13:20 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Szydlowski",
"Marek",
""
],
[
"Godlowski",
"Wlodzimierz",
""
],
[
"Stachowiak",
"Tomasz",
""
]
] |
0706.0284 | Bernd Stelzer | Oliver Stelzer-Chilton (for the CDF Collaboration) | First Run II Measurement of the W Boson Mass with CDF | Conference Proceedings for Rencontres de Moriond EW 2007 | null | null | null | hep-ex | null | The CDF collaboration has analyzed ~200/pb of Tevatron Run II data taken
between February 2002 and September 2003 to measure the W boson mass. With a
sample of 63964 W->e nu decays and 51128 W->mu nu decays, we measure M_W =
80413+-34(stat)+-34(syst) MeV. The total measurement uncertainty of 48 MeV
makes this result the most precise single measurement of the W boson mass to
date.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 19:31:00 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Stelzer-Chilton",
"Oliver",
"",
"for the CDF Collaboration"
]
] |
0706.0285 | Dolors Herbera | Lidia Angeleri-Hugel, Dolors Herbera and Jan Trlifaj | Baer and Mittag-Leffler modules over tame hereditary algebras | 18 pages | null | null | null | math.RA math.RT | null | We develop a structure theory for two classes of infinite dimensional modules
over tame hereditary algebras: the Baer modules, and the Mittag-Leffler ones.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 19:32:45 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Angeleri-Hugel",
"Lidia",
""
],
[
"Herbera",
"Dolors",
""
],
[
"Trlifaj",
"Jan",
""
]
] |
0706.0286 | Gerardo Adesso | Gerardo Adesso | The social aspects of quantum entanglement | 3 pages, 1 art figure; to appear (translated) in "Ordint la Trama",
Catalan magazine of popular culture | "Ordint la Trama", n. 56, pag. 3 (june 2007) | null | null | physics.pop-ph quant-ph | null | This brief article discusses some aspects of quantum theory and their impact
on popular culture. The basic features of quantum entanglement between two or
more parties are introduced in a language suitable for a general audience, and
metaphorically connected to love and faithfulness in human relationships.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 20:13:58 GMT"
}
] | 2007-06-21T00:00:00 | [
[
"Adesso",
"Gerardo",
""
]
] |
0706.0287 | Margaret Beattie | Margaret Beattie, Daniel Bulacu | On the antipode of a co-Frobenius (co)quasitriangular Hopf algebra | null | null | null | null | math.QA math.RA | null | We extend to the co-Frobenius case a result of Drinfeld and Radford related
to the fourth power of the antipode of a finite dimensional (co)quasitriangular
Hopf algebra.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 20:21:23 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Beattie",
"Margaret",
""
],
[
"Bulacu",
"Daniel",
""
]
] |
0706.0288 | Sergei Dubovsky | Sergei Dubovsky, Peter Tinyakov, Matias Zaldarriaga | Bumpy black holes from spontaneous Lorentz violation | 40 pages, 4 figures | JHEP0711:083,2007 | 10.1088/1126-6708/2007/11/083 | null | hep-th astro-ph gr-qc hep-ph | null | We consider black holes in Lorentz violating theories of massive gravity. We
argue that in these theories black hole solutions are no longer universal and
exhibit a large number of hairs. If they exist, these hairs probe the
singularity inside the black hole providing a window into quantum gravity. The
existence of these hairs can be tested by future gravitational wave
observatories. We generically expect that the effects we discuss will be larger
for the more massive black holes. In the simplest models the strength of the
hairs is controlled by the same parameter that sets the mass of the graviton
(tensor modes). Then the upper limit on this mass coming from the inferred
gravitational radiation emitted by binary pulsars implies that hairs are likely
to be suppressed for almost the entire mass range of the super-massive black
holes in the centers of galaxies.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 20:23:26 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Dec 2007 02:22:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dubovsky",
"Sergei",
""
],
[
"Tinyakov",
"Peter",
""
],
[
"Zaldarriaga",
"Matias",
""
]
] |
0706.0289 | Ram Seshadri | Young-Il Kim, Katharine Page, Andi M. Limarga, David R. Clarke, and
Ram Seshadri | Local structure evolution in polycrystalline Zn$_{1-x}$Mg$_x$O
($0\leq{x}\leq{0.15}$) studied by Raman and by synchrotron x-ray pair
distribution analysis | 10 pages, 12 figures RevTex | Phys. Rev. B 76, 115204 (2007) (10 pages) | 10.1103/PhysRevB.76.115204 | null | cond-mat.mtrl-sci | null | The local structures of Zn$_{1-x}$Mg$_x$O alloys have been studied by Raman
spectroscopy and by synchrotron x-ray pair distribution function (PDF)
analysis. Within the solid solution range ($0\leq{x}\leq{0.15}$) of
Zn$_{1-x}$Mg$_x$O, the wurtzite framework is maintained with Mg homogeneously
distributed throughout the wurtzite lattice. The $E_2^\mathrm{high}$ Raman line
of Zn$_{1-x}$Mg$_x$O displays systematic changes in response to the evolution
of the crystal lattice upon the Mg-substitution. The red-shift and broadening
of the $E_2^\mathrm{high}$ mode are explained by the expansion of hexagonal
$ab$-dimensions, and compositional disorder of Zn/Mg, respectively. Synchrotron
x-ray PDF analyses of Zn$_{1-x}$Mg$_x$O reveal that the Mg atoms have a
slightly reduced wurtzite parameter $u$ and more regular tetrahedral bond
distances than the Zn atoms. For both Zn and Mg, the internal tetrahedral
geometries are independent of the alloy composition.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 21:49:30 GMT"
}
] | 2007-10-16T00:00:00 | [
[
"Kim",
"Young-Il",
""
],
[
"Page",
"Katharine",
""
],
[
"Limarga",
"Andi M.",
""
],
[
"Clarke",
"David R.",
""
],
[
"Seshadri",
"Ram",
""
]
] |
0706.0290 | Sophie Frisch | Sophie Frisch and Leonid Vaserstein | Parametrization of Pythagorean triples by a single triple of polynomials | to appear in J. Pure Appl. Algebra | J. Pure Appl. Algebra 212(1) (2008) 271-274 | 10.1016/j.jpaa.2007.05.019 | null | math.NT math.GM | null | It is well known that Pythagorean triples can be parametrized by two triples
of polynomials with integer coefficients. We show that no single triple of
polynomials with integer coefficients in any number of variables is sufficient,
but that there exists a parametrization of Pythagorean triples by a single
triple of integer-valued polynomials.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 23:25:52 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Jun 2007 15:52:08 GMT"
}
] | 2011-06-29T00:00:00 | [
[
"Frisch",
"Sophie",
""
],
[
"Vaserstein",
"Leonid",
""
]
] |
0706.0291 | Jozsef Garai | Jozsef Garai | Semi-empirical pressure-volume-temperature equation of state; MgSiO3
perovskite is an example | null | J. Appl. Phys. 102, 1123506 (2007) | 10.1063/1.2822458 | null | physics.gen-ph physics.geo-ph | null | Simple general formula describing the p-V-T relationships of elastic solids
is derived from theoretical considerations. The new EoS was tested to
experiments of perovskite 0-109 GPa and 293-2000 K. The parameters providing
the best fit are: Ko = 267.5 GPa, Vo = 24.284 cm3, alpha_o = 2.079x10^-5 K^-1,
the pressure derivative of Ko is 1.556 and the pressure derivative of alpha_o
is -1.098x10^-7 K^-1GPa^-1 . The root-mean-square-deviations (RMSD) of the
residuals are 0.043 cm3, 0.79 GPa, and 125 K for the molar volume, pressure,
and temperature respectively. These RMSD values are in the range of the
uncertainty of the experiments, indicating that the five parameters
semi-empirical EoS correctly describes the p-V-T relationships of perovskite.
Separating the experiments into 200 K ranges the semi-empirical EoS was
compared to the most widely used finite strain, interatomic potential, and
empirical isothermal EoSs such as the Birch-Murnaghan, the Vinet, and the
Roy-Roy respectively. Correlation coefficients, RMSDs of the residuals and
Akaike Information Criteria were used for evaluating the fitting. Based on
these fitting parameters under pure isothermal conditions the semi-empirical
p-V EoS is slightly weaker than the Birch-Murnaghan and Vinet EoSs; however,
the semi-empirical p-V-T EoS is superior in every temperature range to all of
the investigated conventional isothermal EoSs.
| [
{
"version": "v1",
"created": "Sat, 2 Jun 2007 23:44:28 GMT"
},
{
"version": "v2",
"created": "Wed, 18 Jul 2007 19:01:06 GMT"
},
{
"version": "v3",
"created": "Sat, 10 Nov 2007 19:07:14 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Garai",
"Jozsef",
""
]
] |
0706.0292 | Sophie Frisch | Sophie Frisch | Remarks on polynomial parametrization of sets of integer points | to appear in Comm. Algebra | Communications in Algebra 36 (2008) (3) 1110 - 1114 | 10.1080/00927870701776938 | null | math.NT math.AC | null | If, for a subset S of Z^k, we compare the conditions of being parametrizable
(a) by a single k-tuple of polynomials with integer coefficients, (b) by a
single k-tuple of integer-valued polynomials and, (c) by finitely many k-tuples
of polynomials with integer coefficients (variables ranging through the
integers in each case) then (a) implies (b) (obviously), (b) implies (c), and
neither converse holds. Condition (b) is equivalent to the set S being the set
of integer values taken by some k-tuple of polynomials with rational
coefficients as the variables range through the integers. We also show that
every co-finite subset of Z^k is parametrizable a single k-tuple of polynomials
with integer coefficients.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 00:18:58 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Jun 2007 15:41:20 GMT"
}
] | 2011-06-29T00:00:00 | [
[
"Frisch",
"Sophie",
""
]
] |
0706.0293 | Jihn E. Kim | Jihn E. Kim | Gauge mediated supersymmetry breaking without exotics in orbifold
compactification | 16 pages with 3 figures | Phys.Lett.B651:407-413,2007 | 10.1016/j.physletb.2007.06.048 | SNUTP 07-007 | hep-ph hep-th | null | We suggest SU(5)$'$ in the hidden sector toward a possible gauge mediated
supersymmetry breaking scenario for removing the SUSY flavor problem, with an
example constructed in $\Z_{12-I}$ with three families. The example we present
has the Pati-Salam type classification of particles in the observable sector
and has no exotics at low energy. We point out that six or seven very light
pairs of ${\bf 5}'$ and $\bar{\bf 5}'$ out of ten vectorlike $\five'$ and
$\fiveb'$ pairs of SU(5)$'$ is achievable, leading to a possibility of an
unstable supersymmetry breaking vacuum. The possibility of different
compactification radii of three two tori toward achieving the needed coupling
strength is also suggested.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 04:23:02 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Jun 2007 08:32:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kim",
"Jihn E.",
""
]
] |
0706.0294 | Edoardo Airoldi | Edoardo M Airoldi, David M Blei, Stephen E Fienberg, Eric P Xing | Mixed membership analysis of high-throughput interaction studies:
Relational data | 22 pages, 6 figures, 2 tables | null | null | null | q-bio.MN q-bio.QM | null | In this paper, we consider the statistical analysis of a protein interaction
network. We propose a Bayesian model that uses a hierarchy of probabilistic
assumptions about the way proteins interact with one another in order to: (i)
identify the number of non-observable functional modules; (ii) estimate the
degree of membership of proteins to modules; and (iii) estimate typical
interaction patterns among the functional modules themselves. Our model
describes large amount of (relational) data using a relatively small set of
parameters that we can reliably estimate with an efficient inference algorithm.
We apply our methodology to data on protein-to-protein interactions in
saccharomyces cerevisiae to reveal proteins' diverse functional roles. The case
study provides the basis for an overview of which scientific questions can be
addressed using our methods, and for a discussion of technical issues.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 03:09:03 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Nov 2007 19:54:01 GMT"
}
] | 2007-11-15T00:00:00 | [
[
"Airoldi",
"Edoardo M",
""
],
[
"Blei",
"David M",
""
],
[
"Fienberg",
"Stephen E",
""
],
[
"Xing",
"Eric P",
""
]
] |
0706.0295 | Takahiro Tanaka | Jaume Garriga and Takahiro Tanaka | Can infrared gravitons screen $\Lambda$? | 15 pages, added references and comments to arXiv:0708.2004[hep-th]
with some minor corrections | Phys.Rev.D77:024021,2008 | 10.1103/PhysRevD.77.024021 | KUNS-2076 | hep-th gr-qc | null | It has been suggested that infrared gravitons in de Sitter space may lead to
a secular screening of the effective cosmological constant. This seems to clash
with the naive expectation that the curvature scalar should stay constant due
to the Heisenberg equation of motion. Here, we show that the tadpole correction
to the local expansion rate, which has been used in earlier analyses as an
indicator of a decaying effective $\Lambda$, is not gauge invariant. On the
other hand, we construct a gauge invariant operator which measures the
renormalized curvature scalar smeared over an arbitrary window function, and we
find that there is no secular screening of this quantity (to any given order in
perturbation theory).
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 02:40:11 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 01:27:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Garriga",
"Jaume",
""
],
[
"Tanaka",
"Takahiro",
""
]
] |
0706.0296 | Zhi-Gang Wang | Zhi-Gang Wang (NCEPU, Baoding) | Analysis of the vertices D^*D^* P, D^*D V and DDV with light-cone QCD
sum rules | 26 pages, 8 figures, extended version, write the equations in compact
form, add more discussions | Nucl.Phys.A796:61-82,2007 | 10.1016/j.nuclphysa.2007.09.004 | null | hep-ph | null | In this article, we study the vertices $D^*D^*P$, $D^*DV$ and DDV with the
light-cone QCD sum rules. The strong coupling constants g_{D^*D^*P}, g_{D^*DP},
f_{D^*DV}, f_{D^*D^*V}, g_{DDV} and g_{D^*D^*V} play an important role in
understanding the final-state interactions in the hadronic B decays. They
relate to the basic parameters g, $\lambda$ and $\beta$ in the heavy quark
effective Lagrangian respectively. Our numerical values of the g, $\beta$ and
$\lambda$ are much smaller than most of the existing estimations. If the
predictions from the light-cone QCD sum rules are robust, the final-state
interaction effects maybe overestimated in the hadronic B decays.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 03:04:45 GMT"
},
{
"version": "v2",
"created": "Sun, 17 Jun 2007 13:04:32 GMT"
},
{
"version": "v3",
"created": "Thu, 21 Jun 2007 08:09:19 GMT"
},
{
"version": "v4",
"created": "Wed, 22 Aug 2007 02:46:46 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wang",
"Zhi-Gang",
"",
"NCEPU, Baoding"
]
] |
0706.0297 | Masahiko Iwasaki | M. Iwasaki, H. Bhang, J. Chiba, S. Choi, Y. Fukuda, T. Hanaki, R. S.
Hayano, M. Iio, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M.
Iwai, P. Kienle, J. H. Kim, Y. Matsuda, H. Ohnishi, S. Okada, H. Outa, M.
Sato, S. Suzuki, T. Suzuki, D. Tomono, E. Widmann, T. Yamazaki, H. Yim | Search for a kaonic nuclear state via $^4$He$(K^-, N)$ | 6 pages, 8 figures, conference HYP07 at Maintz | null | null | null | nucl-ex | null | Very recently, we have performed a couple of experiments, {\it{KEK
PS-E549/E570}}, for the detailed study of the strange tribaryon $S^0(3115)$
obtained in {\it{KEK PS-E471}}. These experiments were performed to accumulate
much higher statistics with improved experimental apparatusespecially for the
better proton spectroscopy of the $^4$He({\it{stopped K}}$^-$, {\it{N}})
reaction. In contrast to the previous proton spectrum, no narrow ($\sim$ 20
MeV) peak structure was found either in the inclusive $^4$He({\it{stopped
K}}$^-$, {\it{p}}) or in the semi-inclusive $^4$He({\it{stopped K}}$^-$,
{\it{p}}$X^\pm$) reaction channel, which is equivalent to the previous $E471$
event trigger condition. Detailed analysis of the present data and simulation
shows that the peak, corresponding to $S^0(3115)$, has been an experimental
artifact. Present analysis does not exclude the possible existence of a much
wider structure. To be sensitive to such structure and for better understanding
of the non-mesonic $K^-$ absorption reaction channel, detailed analysis of the
data is in progress.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 03:10:46 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Iwasaki",
"M.",
""
],
[
"Bhang",
"H.",
""
],
[
"Chiba",
"J.",
""
],
[
"Choi",
"S.",
""
],
[
"Fukuda",
"Y.",
""
],
[
"Hanaki",
"T.",
""
],
[
"Hayano",
"R. S.",
""
],
[
"Iio",
"M.",
""
],
[
"Ishikawa",
"T.",
""
],
[
"Ishimoto",
"S.",
""
],
[
"Ishiwatari",
"T.",
""
],
[
"Itahashi",
"K.",
""
],
[
"Iwai",
"M.",
""
],
[
"Kienle",
"P.",
""
],
[
"Kim",
"J. H.",
""
],
[
"Matsuda",
"Y.",
""
],
[
"Ohnishi",
"H.",
""
],
[
"Okada",
"S.",
""
],
[
"Outa",
"H.",
""
],
[
"Sato",
"M.",
""
],
[
"Suzuki",
"S.",
""
],
[
"Suzuki",
"T.",
""
],
[
"Tomono",
"D.",
""
],
[
"Widmann",
"E.",
""
],
[
"Yamazaki",
"T.",
""
],
[
"Yim",
"H.",
""
]
] |
0706.0298 | Jian Zhai | Jian Zhai | The rectifiability of singular sets for geometric flows (I)--Yang-Mills
flow | 11 pages | null | null | null | math.AP math.DG | null | We prove that monotonicity of density and energy inequality imply the
rectifiability of the singular sets for Yang-Mills flow.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 03:25:55 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Zhai",
"Jian",
""
]
] |
0706.0299 | Jianda Wu | Jian-Lan Chen, Mei-sheng Zhao, Jian-da Wu, and Yong-de Zhang | Invariant Perturbation Theory of Adiabatic Process | 4 pages, no figures | null | null | null | quant-ph | null | In this paper we present an invariant perturbation theory to adiabatic
process according to the concepts of adiabatic orbits, adiabatic evolution
orbit and U(1)-invariant adiabatic orbit. The probabilities of keeping the
adiabatic orbit in the first-order and the second-order approximation are
calculated, respectively. We also give a convenient sufficient condition.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 03:39:54 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Jun 2007 02:34:40 GMT"
},
{
"version": "v3",
"created": "Wed, 6 Jun 2007 06:53:19 GMT"
}
] | 2007-06-06T00:00:00 | [
[
"Chen",
"Jian-Lan",
""
],
[
"Zhao",
"Mei-sheng",
""
],
[
"Wu",
"Jian-da",
""
],
[
"Zhang",
"Yong-de",
""
]
] |
0706.0300 | Tshilidzi Marwala | Simon Scurrell, Tshilidzi Marwala and David Rubin | Automatic Detection of Pulmonary Embolism using Computational
Intelligence | 5 pages | null | null | null | cs.CV | null | This article describes the implementation of a system designed to
automatically detect the presence of pulmonary embolism in lung scans. These
images are firstly segmented, before alignment and feature extraction using
PCA. The neural network was trained using the Hybrid Monte Carlo method,
resulting in a committee of 250 neural networks and good results are obtained.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 05:17:38 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Scurrell",
"Simon",
""
],
[
"Marwala",
"Tshilidzi",
""
],
[
"Rubin",
"David",
""
]
] |
0706.0301 | Om Prakash Singh Negi | P. S. Bisht, O. P. S. Negi and Jivan Singh | Generalized Electromagnetic fields of Dyons in Inhomogenous Media | null | null | null | null | hep-th | null | Reformulation of the generalized electromagnetic fields of dyons has been
dicussed in inhomogenous media and corresponding quaternionic equations are
derived in compact, simple and unique manner. We have also discussed the
monochromatic fields of generalized electromagnetic fields of dyons in slowly
changing media in a consistent manner.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 05:22:52 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Bisht",
"P. S.",
""
],
[
"Negi",
"O. P. S.",
""
],
[
"Singh",
"Jivan",
""
]
] |
0706.0302 | Shun Zhou | Shun Zhou | Neutrino Decays and Neutrino Electron Elastic Scattering in Unparticle
Physics | 10 pages including 2 PS figures; v2: an error removed and the text
rewritten; v3: minor changes, accepted for publication in Phys. Lett. B | Phys.Lett.B659:336-340,2008 | 10.1016/j.physletb.2007.10.081 | null | hep-ph astro-ph hep-th | null | Following Georgi's unparticle scheme, we examine the effective couplings
between neutrinos and unparticle operators. As an immediate consequence,
neutrinos become unstable and can decay into the unparticle stuff. Assuming the
dimension transmutation scale is around $\Lambda^{}_{\cal U} \sim 1 ~{\rm
TeV}$, we implement the cosmological limit on the neutrino lifetime to
constrain the neutrino-unparticle couplings for different scaling dimensions
$d$. In addition, provided that the electron-unparticle coupling is restricted
due to the precise measurement of the anomalous magnetic moment of electron, we
calculate the unparticle contribution to the neutrino-electron elastic
scattering. It is more important to jointly deal with the couplings of the
unparticle to the standard model particles rather than separately. Taking into
account both electron- and neutrino-unparticle couplings, we find that the
scaling dimension of the scalar unparticle should lie in the narrow range $1 <
d < 2$ by requiring the observables to be physically meaningful. However, there
is no consistent range of $d$ for the vector unparticle operator.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 06:09:15 GMT"
},
{
"version": "v2",
"created": "Sun, 15 Jul 2007 09:31:41 GMT"
},
{
"version": "v3",
"created": "Tue, 30 Oct 2007 02:58:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zhou",
"Shun",
""
]
] |
0706.0303 | Ajit Mohanty | Ajit Kumar Mohanty | A hybrid model for fusion at deep sub-barrier energies | 11 pages, 9 figures | null | null | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A hybrid model where the tunneling probability is estimated based on both
sudden and adiabatic approaches has been proposed to understand the heavy ion
fusion phenomena at deep sub-barrier energies. It is shown that under certain
approximations, it amounts to tunneling through two barriers: one while
overcoming the normal Coulomb barrier (which is of sudden nature) along the
radial direction until the repulsive core is reached and thereafter through an
adiabatic barrier along the neck degree of freedom while making transition from
a di-nuclear to a mono-nuclear regime through shape relaxation. A general
feature of this hybrid model is a steep fall-off of the fusion cross section,
sharp increase of logarithmic derivative L(E) with decreasing energy and the
astrophysical S-factor showing a maxima at deep sub-barrier energies
particularly for near symmetric systems. The model can explain the experimental
fusion measurements for several systems ranging from near symmetric systems
like $^{58}Ni+^{64}Ni, ^{58}Ni+^{58}Ni$ and $ ^{58}Ni+^{69}Y$ to asymmetric one
like $^{16}O+^{208}Pb$ where the experimental findings are very surprising.
Since the second tunneling is along the neck co-ordinate, it is further
conjectured that deep sub-barrier fusion supression may not be observed for the
fusion of highly asymmetric projectile target combinations where adiabatic
transition occurs automatically without any hindrance. The recent deep
sub-barrier fusion cross section measurements of $^{6}Li+^{198}Pt$ system
supports this conjecture.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 07:15:58 GMT"
},
{
"version": "v2",
"created": "Wed, 17 Nov 2010 18:21:38 GMT"
}
] | 2010-11-18T00:00:00 | [
[
"Mohanty",
"Ajit Kumar",
""
]
] |
0706.0304 | Brendan Douglas | B. L. Douglas and J. B. Wang | Efficient quantum circuit implementation of quantum walks | null | null | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum walks, being the quantum analogue of classical random walks, are
expected to provide a fruitful source of quantum algorithms. A few such
algorithms have already been developed, including the `glued trees' algorithm,
which provides an exponential speedup over classical methods, relative to a
particular quantum oracle. Here, we discuss the possibility of a quantum walk
algorithm yielding such an exponential speedup over possible classical
algorithms, without the use of an oracle. We provide examples of some highly
symmetric graphs on which efficient quantum circuits implementing quantum walks
can be constructed, and discuss potential applications to quantum search for
marked vertices along these graphs.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 08:07:37 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Mar 2008 06:14:42 GMT"
},
{
"version": "v3",
"created": "Thu, 29 Oct 2009 11:51:49 GMT"
}
] | 2009-10-29T00:00:00 | [
[
"Douglas",
"B. L.",
""
],
[
"Wang",
"J. B.",
""
]
] |
0706.0305 | Ennio Poretti | Ennio Poretti (1), Monica Rainer (1), Katrien Uytterhoeven (1),
Giuseppe Cutispoto (2), Elisa Distefano (2), Paolo Romano (2) ((1) INAF-OA
Brera, Milano, Italy (2) INAF-OA Catania, Italy) | CoRoT and asteroseismology. Preparatory work and simultaneous
ground-based monitoring | Contributed talk at the " 51 Congresso Societa' Astronomica
Italiana", Firenze (Italy), April 17-20, 2007 | null | null | null | astro-ph | null | The successful launch of the CoRoT (COnvection, ROtation and planetary
Transits) satellite opens a new era in asteroseismology. The space photometry
is complemented by high-resolution spectroscopy and multicolour photometry from
ground, to disclose the pulsational content of the asteroseismic targets in the
most complete way. Some preliminary results obtained with both types of data
are presented. The paper is based on observations collected at S. Pedro Martir,
Serra La Nave, La Silla, and Telescopio Nazionale Galileo Observatories.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 13:42:13 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Poretti",
"Ennio",
""
],
[
"Rainer",
"Monica",
""
],
[
"Uytterhoeven",
"Katrien",
""
],
[
"Cutispoto",
"Giuseppe",
""
],
[
"Distefano",
"Elisa",
""
],
[
"Romano",
"Paolo",
""
]
] |
0706.0306 | Johannes Mueller | Andreas Hense, Johannes Mueller | Submission of content to a digital object repository using a
configurable workflow system | null | null | null | null | cs.DL | null | The prototype of a workflow system for the submission of content to a digital
object repository is here presented. It is based entirely on open-source
standard components and features a service-oriented architecture. The front-end
consists of Java Business Process Management (jBPM), Java Server Faces (JSF),
and Java Server Pages (JSP). A Fedora Repository and a mySQL data base
management system serve as a back-end. The communication between front-end and
back-end uses a SOAP minimal binding stub. We describe the design principles
and the construction of the prototype and discuss the possibilities and
limitations of work ow creation by administrators. The code of the prototype is
open-source and can be retrieved in the project escipub at
http://sourceforge.net
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 19:37:41 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Hense",
"Andreas",
""
],
[
"Mueller",
"Johannes",
""
]
] |
0706.0307 | Alexander Iomin | A. Iomin and Yu. Bliokh | Wave localization as a manifestation of ray chaos in underwater
acoustics | null | Communications in Nonlinear Science and Numerical Simulations 8
(2003) 389-399 | 10.1016/S1007-5704(03)00033-9 | null | nlin.CD | null | Wave chaos is demonstrated by studying a wave propagation in a periodically
corrugated wave-guide. In the limit of a short wave approximation (SWA) the
underlying description is related to the chaotic ray dynamics. In this case the
control parameter of the problem is characterized by the corrugation amplitude
and the SWA parameter. The considered model is fairly suitable and tractable
for the analytical analysis of a wave localization length. The number of
eigenmodes characterized the width of the localized wave packet is estimated
analytically.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 09:23:38 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Iomin",
"A.",
""
],
[
"Bliokh",
"Yu.",
""
]
] |
0706.0308 | Alexander Iomin | A. Iomin and G.M. Zaslavsky | Sensitivity of ray paths to initial condition | null | Communications in Nonlinear Science and Numerical Simulation 8
(2003) 401 - 413 | null | null | nlin.CD | null | Using a parabolic equation, we consider ray propagation in a waveguide with
the sound speed profile that corresponds to the dynamics of a nonlinear
oscillator. An analytical consideration of the dependence of the travel time on
the initial conditions is presented. Using an exactly solvable model and the
path integral representation of the travel time, we explain the step-like
behavior of the travel time (T) as a function of the starting momentum (p_0)
(related to the starting ray grazing angle (\chi_0) by (p_0=\tan\chi_0)). A
periodic perturbation of the waveguide along the range leads to wave and ray
chaos. We explain an inhomogeneity of distribution of the chaotic ray travel
times, which has obvious maxima. These maxima lead to the clustering of rays
and each maximum relates to a ray identifier, {\em i.e.} to the number of ray
semi--cycles along the ray path.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 09:45:10 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Iomin",
"A.",
""
],
[
"Zaslavsky",
"G. M.",
""
]
] |
0706.0309 | Adrian Riskin | Adrian Riskin | On the decycling of powers and products of cycles | 5 pages | null | null | null | math.CO | null | We calculate exact values of the decycling numbers of $C_{m} \times C_{n}$
for $m=3,4$, of $C_{n}^{2}$, and of $C_{n}^{3}$.
| [
{
"version": "v1",
"created": "Mon, 4 Jun 2007 14:42:04 GMT"
}
] | 2007-06-05T00:00:00 | [
[
"Riskin",
"Adrian",
""
]
] |
0706.0310 | George Pronko | G. Pronko | Quantum superintegrable system for arbitrary spin | 7 pages | null | 10.1088/1751-8113/40/44/013 | null | math-ph math.MP | null | In [1] was considered the superintegrable system which describes the magnetic
dipole with spin 1/2 (neutron) in the field of linear current. Here we present
its generalization for any spin which preserves superintegrability. The
dynamical symmetry stays the same as it is for spin 1/2.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 10:01:22 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Sep 2007 11:51:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pronko",
"G.",
""
]
] |
0706.0311 | Vladimir Kuksa | V. I. Kuksa | Universal factorized formula for the cross-section of two-particle
scattering | 8 pages, corrected typos. change content | IJMPA 23, 4509 (2008) | 10.1142/S0217751X08041682 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the process of two-particle scattering with unstable particle in
an intermediate state. It was shown that the cross-section can be represented
in the universal factorized form for an arbitrary set of particles.
Phenomenological analysis of factorization effect is fulfilled.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 10:03:59 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 06:32:28 GMT"
},
{
"version": "v3",
"created": "Wed, 12 Aug 2009 08:02:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kuksa",
"V. I.",
""
]
] |
0706.0312 | Veronique Bernard | V\'eronique Bernard | Chiral Perturbation Theory and Baryon Properties | commissioned article for Prog. Nucl. Part. Phys | Prog.Part.Nucl.Phys.60:82-160,2008 | 10.1016/j.ppnp.2007.07.001 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | null | Theoretical as well as experimental progress has been made in the last decade
in describing the properties of baryons. In this review I will mostly report on
the theoretical issues. Two non-perturbative methods are privileged frameworks
for studying these properties in the low energy domain: chiral perturbation
theory, the effective field theory of the Standard Model at energies below 1
GeV and lattice QCD. I will mainly concentrate here on the first one but I will
also discuss the complementarity of the two methods. Chiral extrapolations for
lattice simulations of some nucleon properties will be investigated. I will
then concentrate on processes involving at most two nucleons, describing for
example pion-nucleon and pion-deuteron scattering, pion photo- and
electroproduction off the nucleon and the deuteron and doubly virtual Compton
scattering. Three flavor calculations will also be reviewed.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 10:38:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bernard",
"Véronique",
""
]
] |
0706.0313 | J. Biemond | Jacob Biemond | Quasi-periodic oscillations, charge and the gravitomagnetic theory | Table 1 revised. Two references added | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new model for the explanation of the high frequency quasi-periodic
oscillations (QPOs) in pulsars, black holes and white dwarfs is presented.
Three circular tori are assumed to be present around the star: an inner torus
with charge $Q_i$, an outer torus with charge $Q_o$ and a torus with
electrically neutral mass $m_m$ in the middle, whereas the star bears a charge
$Q_s$ ($Q_o$ and $Q_s$ have the same sign, $Q_i$ the opposite one). The
frequency $\nu_m$ of the mass current is approximately given by the Kepler
frequency, whereas the frequencies of $Q_i$ and $Q_o$, $\nu_i$ and $\nu_o$,
respectively, are calculated from classical mechanics and Coulomb's law.
For the explanation of the low frequency QPOs in pulsars and black holes a
special interpretation of the gravitomagnetic theory may be essential. From the
latter theory four new gravitomagnetic precession frequencies are deduced,
which may be identified with the observed low frequency QPOs.
Predictions of the presented model are compared with observed high frequency
and low frequency QPOs of the pulsars SAX J1808.4--3658, XTE J1807--294, IGR
J00291+5934, SGR 1806--20 and the black hole XTE J1550--564. In addition,
charge flow near the pole of pulsars may explain frequency drift of burst
oscillations. Moreover, charge flow at the equator of SAX J1808.4--3658 may be
the cause of the enigmatic 410 kHz QPO. Furthermore, the Lense-Thirring
frequency is discussed and a modified formula is compared with data of the
pulsars.
Contrary to pulsars and black holes, the low frequency QPOs of white dwarfs
might be attributed to electromagnetic precession frequencies, deduced in this
work. Predictions are compared with data of the dwarf nova VW Hyi.
| [
{
"version": "v1",
"created": "Sun, 3 Jun 2007 10:44:39 GMT"
},
{
"version": "v2",
"created": "Fri, 20 Mar 2009 21:24:15 GMT"
}
] | 2009-03-21T00:00:00 | [
[
"Biemond",
"Jacob",
""
]
] |
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