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802.1303 | Wieslaw Bajguz | M. Dziemia\'nczuk, W. Bajguz | On GCD-morphic sequences | null | null | null | null | math.CO cs.DM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This note is a response to one of the problems posed by Kwa\'sniewski in
[1,2], see also [3] i.e. GCD-morphic Problem III. We show that any GCD-morphic
sequence $F$ is at the point product of primary GCD-morphic sequences and any
GCD-morphic sequence is encoded by natural number valued sequence satisfying
condition (C1). The problem of general importance - for example in number
theory was formulated in [1,2] while investigating a new class of DAG's and
their correspondent p.o. sets encoded uniquely by sequences with
combinatorially interpretable properties.
| [
{
"version": "v1",
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] | 2008-02-13T00:00:00 | [
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"M.",
""
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802.1304 | Sergey Trudolyubov | Sergey Trudolyubov | XMM-Newton discovery of transient X-ray pulsar in NGC 1313 | 6 pages, 4 figures. Accepted for publication in MNRAS. Updated to
match the accepted version | Mon.Not.Roy.Astron.Soc. 387 (2008), L36-L40 | 10.1111/j.1745-3933.2008.00478.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the discovery and analysis of the transient X-ray pulsar XMMU
J031747.5-663010 detected in the 2004 November 23 XMM-Newton observation of the
spiral galaxy NGC 1313. The X-ray source exhibits pulsations with a period
P~765.6 s and a nearly sinusoidal pulse shape and pulsed fraction ~38% in the
0.3-7 keV energy range. The X-ray spectrum of XMMU J031747.5-663010 is hard and
is well fitted with an absorbed simple power law of photon index ~1.5 in the
0.3-7 keV energy band. The X-ray properties of the source and the absence of an
optical/UV counterpart brighter than 20 mag allow us to identify XMMU
J031747.5-663010 as an accreting X-ray pulsar located in NGC 1313. The
estimated absorbed 0.3-7 keV luminosity of the source L~1.6\times 10^{39}
ergs/s, makes it one of the brightest X-ray pulsars known. Based on the
relatively long pulse period and transient behaviour of the source, we classify
it as a Be binary X-ray pulsar candidate. XMMU J031747.5-663010 is the second
X-ray pulsar detected outside the Local Group, after transient 18 s pulsating
source CXOU J073709.1+653544 discovered in the nearby spiral galaxy NGC 2403.
| [
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},
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""
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802.1305 | Hikaru Kawamura | Takahiro Mori and Hikaru Kawamura | Simulation study of earthquakes based on the two-dimensional
Burridge-Knopoff model with the long-range interaction | null | Phys. Rev. E77, 051123 (2008) | 10.1103/PhysRevE.77.051123 | null | cond-mat.other physics.geo-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spatiotemporal correlations of the two-dimensional spring-block
(Burridge-Knopoff) models of earthquakes with the long-range inter-block
interactions are extensively studied by means of numerical computer
simulations. The long-range interaction derived from an elasticd theory, which
takes account of the effect of the elastic body adjacent to the fault plane,
falls off with distance r as 1/r^3. Comparison is made with the properties of
the corresponding short-range models studied earlier. Seismic spatiotemporal
correlations of the long-range models generally tend to be weaker than those of
the short-range models. The magnitude distribution exhibits a ``near-critical''
behavior, i.e., a power-law-like behavior close to the Gutenberg-Richter law,
for a wide parameter range with its B-value, B\simeq 0.55, insensitive to the
model parameters, in sharp contrast to that of the 2D short-range model and
those of the 1D short-range and long-range models where such a
``near-critical'' behavior is realized only by fine-tuning the model
parameters. In contrast to the short-range case, the mean stress-drop at a
seismic event of the long-range model is nearly independent of its magnitude,
consistently with the observation. Large events often accompany foreshocks
together with a doughnut-like quiescence as their precursors, while they hardly
accompany aftershocks with almost negligible seismic correlations observed
after the mainshock.
| [
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"version": "v1",
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{
"version": "v2",
"created": "Wed, 18 Jun 2008 05:33:42 GMT"
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] | 2009-11-13T00:00:00 | [
[
"Mori",
"Takahiro",
""
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] |
802.1306 | Dusko Pavlovic | Dusko Pavlovic | Network as a computer: ranking paths to find flows | 12 pages, CSR 2008 | null | null | null | cs.IR cs.AI math.CT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a simple mathematical model of network computation, based on
Markov chains. Similar models apply to a broad range of computational
phenomena, arising in networks of computers, as well as in genetic, and neural
nets, in social networks, and so on. The main problem of interaction with such
spontaneously evolving computational systems is that the data are not uniformly
structured. An interesting approach is to try to extract the semantical content
of the data from their distribution among the nodes. A concept is then
identified by finding the community of nodes that share it. The task of data
structuring is thus reduced to the task of finding the network communities, as
groups of nodes that together perform some non-local data processing. Towards
this goal, we extend the ranking methods from nodes to paths. This allows us to
extract some information about the likely flow biases from the available static
information about the network.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 05:33:37 GMT"
}
] | 2009-04-18T00:00:00 | [
[
"Pavlovic",
"Dusko",
""
]
] | [
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] |
802.1307 | Junichi Shigezumi | Junichi Shigezumi | On the zeros of certain modular functions for the normalizers of
congruence subgroups of low levels I | 66 pages, 51 figures. http://www2.math.kyushu-u.ac.jp/~j.shigezumi/ | null | null | null | math.NT | null | We research the location of the zeros of the Eisenstein series and the
modular functions from the Hecke type Faber polynomials associated with the
normalizers of congruence subgroups which are of genus zero and of level at
most twelve.
In Part I, we will consider the general theory of modular functions for the
normalizers.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 08:35:19 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Mar 2008 15:58:55 GMT"
}
] | 2008-03-25T00:00:00 | [
[
"Shigezumi",
"Junichi",
""
]
] | [
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] |
802.1308 | Tao Tu | Guo-Ping Guo, Hui Zhang, Yong Hu, Tao Tu, Guang-Can Guo | Dispersive Coupling Between the Superconducting Transmission Line
Resonator and the Double Quantum Dots | 10 pages, 5 figures | Phys. Rev. A 020302(R) (2008) | 10.1103/PhysRevA.78.020302 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Realization of controllable interaction between distant qubits is one of the
major problems in scalable solid state quantum computing. We study a
superconducting transmission line resonator (TLR) as a tunable dispersive
coupler for the double-dot molecules. A general interaction Hamiltonian of $n$
two-electron spin-based qubits and the TLR is presented, where the double-dot
qubits are biased at the large detuning region and the TLR is always empty and
virtually excited. Our analysis o the main decoherence sources indicates that
various major quantum operations can be reliably implemented with current
technology.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 06:25:44 GMT"
},
{
"version": "v2",
"created": "Fri, 30 May 2008 08:05:04 GMT"
}
] | 2008-08-23T00:00:00 | [
[
"Guo",
"Guo-Ping",
""
],
[
"Zhang",
"Hui",
""
],
[
"Hu",
"Yong",
""
],
[
"Tu",
"Tao",
""
],
[
"Guo",
"Guang-Can",
""
]
] | [
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] |
802.1309 | George Hobbs | G. Hobbs | Gravitational wave detection using high precision pulsar observations | Accepted for publication in the JPCS issue for the Amaldi 7
proceedings | Class.Quant.Grav.25:114032,2008; J.Phys.Conf.Ser.122:012003,2008 | 10.1088/0264-9381/25/11/114032 10.1088/1742-6596/122/1/012003 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pulsar timing experiments are reaching sufficient sensitivity to detect a
postulated stochastic gravitational wave background generated by merging
supermassive black hole systems in the cores of galaxies. We describe the
techniques behind the pulsar timing detection method, provide current upper
bounds on the amplitude of any gravitational wave background, describe
theoretical models predicting the existence of such a background and highlight
new techniques for providing a statistically rigorous detection of the
background.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 06:52:56 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Hobbs",
"G.",
""
]
] | [
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] |
802.131 | Jung-Wan Ryu | Jung-Wan Ryu, G. Hur, and Sang Wook Kim | Quantum Localization in Open Chaotic Systems | 4 pages, 4 figures | null | 10.1103/PhysRevE.78.037201 | null | quant-ph | null | We study a quasi-Floquet state of a $\delta$-kicked rotor with absorbing
boundaries focusing on the nature of the dynamical localization in open quantum
systems. The localization lengths $\xi$ of lossy quasi-Floquet states located
near the absorbing boundaries decrease as they approach the boundary while the
corresponding decay rates $\Gamma$ are dramatically enhanced. We find the
relation $\xi \sim \Gamma^{-1/2}$ and explain it based upon the finite time
diffusion, which can also be applied to a random unitary operator model. We
conjecture that this idea is valid for the system exhibiting both the diffusion
in classical dynamics and the exponential localization in quantum mechanics.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 07:20:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ryu",
"Jung-Wan",
""
],
[
"Hur",
"G.",
""
],
[
"Kim",
"Sang Wook",
""
]
] | [
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] |
802.1311 | Moshe Mishali | Moshe Mishali and Yonina C. Eldar | Reduce and Boost: Recovering Arbitrary Sets of Jointly Sparse Vectors | 21 Pages, 9 figures. Submitted to the IEEE for possible publication | null | 10.1109/TSP.2008.927802 | CCIT Report #686 Feb-08, EE Pub No. 1643, EE Dept., Technion -
Israel Institute of Technology | nlin.CG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rapid developing area of compressed sensing suggests that a sparse vector
lying in an arbitrary high dimensional space can be accurately recovered from
only a small set of non-adaptive linear measurements. Under appropriate
conditions on the measurement matrix, the entire information about the original
sparse vector is captured in the measurements, and can be recovered using
efficient polynomial methods. The vector model has been extended to a finite
set of sparse vectors sharing a common non-zero location set. In this paper, we
treat a broader framework in which the goal is to recover a possibly infinite
set of jointly sparse vectors. Extending existing recovery methods to this
model is difficult due to the infinite structure of the sparse vector set.
Instead, we prove that the entire infinite set of sparse vectors can recovered
by solving a single, reduced-size finite-dimensional problem, corresponding to
recovery of a finite set of sparse vectors. We then show that the problem can
be further reduced to the basic recovery of a single sparse vector by randomly
combining the measurement vectors. Our approach results in exact recovery of
both countable and uncountable sets as it does not rely on discretization or
heuristic techniques. To efficiently recover the single sparse vector produced
by the last reduction step, we suggest an empirical boosting strategy that
improves the recovery ability of any given sub-optimal method for recovering a
sparse vector. Numerical experiments on random data demonstrate that when
applied to infinite sets our strategy outperforms discretization techniques in
terms of both run time and empirical recovery rate. In the finite model, our
boosting algorithm is characterized by fast run time and superior recovery rate
than known popular methods.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 07:48:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mishali",
"Moshe",
""
],
[
"Eldar",
"Yonina C.",
""
]
] | [
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] |
802.1312 | Josef Cibulka | Josef Cibulka | Untangling polygons and graphs | 11 pages, 3 figures | Discrete and Computational Geometry 43(2): 402-411 (2010) | 10.1007/s00454-009-9150-x | null | cs.CG cs.DM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Untangling is a process in which some vertices of a planar graph are moved to
obtain a straight-line plane drawing. The aim is to move as few vertices as
possible. We present an algorithm that untangles the cycle graph C_n while
keeping at least \Omega(n^{2/3}) vertices fixed. For any graph G, we also
present an upper bound on the number of fixed vertices in the worst case. The
bound is a function of the number of vertices, maximum degree and diameter of
G. One of its consequences is the upper bound O((n log n)^{2/3}) for all
3-vertex-connected planar graphs.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 09:28:15 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jun 2008 09:45:10 GMT"
}
] | 2011-02-07T00:00:00 | [
[
"Cibulka",
"Josef",
""
]
] | [
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] |
802.1313 | Guang-Yu Guo | Zhi Ren Xiao, Guang Yu Guo, Po Han Lee, Hua Shu Hsu, Jung Chun Andrew
Huang | Oxygen Vacancy Induced Ferromagnetism in V$_2$O$_{5-x}$ | To be published as a Letter in J. Phys. Soc. Japan | J. Phys. Soc. Japan 77 (2008) 023706 | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | {\it Ab initio} calculations within density functional theory with
generalized gradient approximation have been performed to study the effects of
oxygen vacancies on the electronic structure and magnetism in undoped
V$_2$O$_{5-x}$ ($0 < x < 0.5$). It is found that the introduction of oxygen
vacancies would induce ferromagnetism in V$_2$O$_{5-x}$ with the magnetization
being proportional to the O vacancy concentration $x$. The calculated
electronic structure reveals that the valence electrons released by the
introduction of oxygen vacancies would occupy mainly the neighboring V
$d_{xy}$-dominant band which then becomes spin-polarized due to intra-atomic
exchange interaction, thereby giving rise to the half-metallic ferromagnetism.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 09:31:41 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Xiao",
"Zhi Ren",
""
],
[
"Guo",
"Guang Yu",
""
],
[
"Lee",
"Po Han",
""
],
[
"Hsu",
"Hua Shu",
""
],
[
"Huang",
"Jung Chun Andrew",
""
]
] | [
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] |
802.1314 | Guang-Yu Guo | I. J. Wu and G. Y. Guo | Second-harmonic generation and linear electro-optical coefficients of
SiC polytypes and nanotubes | null | Phys. Rev. B 78, 035447 (2008) | 10.1103/PhysRevB.78.035447 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The second-order nonlinear optical susceptibility ($\chi_{abc}^{(2)}$) and
linear electro-optical coefficient ($r_{abc}$) of a large number of
single-walled zigzag, armchair and chiral SiC nanotubes (SiC-NTs) as well as
bulk SiC polytypes (2H-, 4H-, 6H- and 3C-SiC) and single graphitic SiC sheet
have been calculated from first-principles. The calculations are based on
density functional theory in the local density approximation and highly
accurate full-potential projector augmented-wave method is used. Both the
zigzag and chiral SiC-NTs are found to exhibit large second-order nonlinear
optical behavior with the $\chi_{abc}^{(2)}$ and $r_{abc}$ coefficients being
up to ten-times larger than that of bulk SiC polytypes, and also being up to
thirteen-times larger than the counterparts of the corresponding BN-NTs,
indicating that SiC-NTs are promising materials for nonlinear optical and
opto-electric applications. The prominant features in the spectra of
$\chi_{abc}^{(2)}(-2\omega,\omega,\omega)$ of the SiC-NTs are correlated with
the features in the linear optical dielectric function $\epsilon (\omega)$ in
terms of single-photon and two-photon resonances.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 09:38:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wu",
"I. J.",
""
],
[
"Guo",
"G. Y.",
""
]
] | [
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] |
802.1315 | Sergei Gninenko | S.N. Gninenko | On search for hidden sector photons in Super-Kamiokande | 9 pages, 2 figures | null | null | null | hep-ph hep-ex | null | If hidden sector photons exist, they could be produced through oscillations
of photons emitted by the Sun. We show that a search for these particles could
be performed in Super-Kamiokande due to the presence in this detector of a
large number of photomultiplier's (PMTs) with a relatively low noise and big
size. These particles would penetrate the Earth shielding and would be detected
by PMTs through their oscillations into real photons inside the PMTs vacuum
volume. This would results in an increase of the PMT counting rate and it daily
variations depending on the Earth position with respect to the Sun. The
proposed search for this effect is sensitive to the photon-hidden photon mixing
strength as small as ~10^{-6} for the hidden photon mass region ~10^{-3} -
10^{-1} eV and, in the case of nonobservation, could improve limits recently
obtained from photon regeneration laser experiments for this mass region.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 19:38:01 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Gninenko",
"S. N.",
""
]
] | [
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] |
802.1316 | Claudio Attaccalite CA | Claudio Attaccalite and Sandro Sorella | Stable liquid Hydrogen at high pressure by a novel ab-initio molecular
dynamics | accepted for publication in Phys. Rev. Letters | null | 10.1103/PhysRevLett.100.114501 | null | cond-mat.str-el | null | We introduce an efficient scheme for the molecular dynamics of electronic
systems by means of quantum Monte Carlo. The evaluation of the
(Born-Oppenheimer) forces acting on the ionic positions is achieved by two main
ingredients: i) the forces are computed with finite and small variance, which
allows the simulation of a large number of atoms, ii) the statistical noise
corresponding to the forces is used to drive the dynamics at finite temperature
by means of an appropriate Langevin dynamics. A first application to the
high-density phase of Hydrogen is given, supporting the stability of the liquid
phase at \simeq 300GPa and \simeq 400K.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 10:48:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Attaccalite",
"Claudio",
""
],
[
"Sorella",
"Sandro",
""
]
] | [
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802.1317 | Ashkan Nikeghbali | Ashkan Nikeghbali | A generalization of Doob's maximal identity | null | null | null | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, using martingale techniques, we prove a generalization of
Doob's maximal identity in the setting of continuous nonnegative local
submartingales $(X_{t})$ of the form: $X_{t}=N_{t}+A_{t}$, where the measure
$(dA_{t})$ is carried by the set $\left\{t: X_{t}=0\right\}$. In particular, we
give a multiplicative decomposition for the Az\'ema supermartingale associated
with some last passage times related to such processes and we prove that these
non-stopping times contain very useful information. As a consequence, we obtain
the law of the maximum of a continuous nonnegative local martingale $(M_t)$
which satisfies $M_\infty=\psi(\sup_{t\geq0}M_t)$ for some measurable function
$\psi$ as well as the law of the last time this maximum is reached.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 10:48:27 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Nikeghbali",
"Ashkan",
""
]
] | [
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] |
802.1318 | Miloslav Znojil | Miloslav Znojil | Quantum knots | 18 pp, 3 figs | Phys. Lett. A 372 (2008) 3591 - 3596 | 10.1016/j.physleta.2008.02.016 | null | quant-ph | null | It is known that besides the usual unitary mappings $\Omega =
1/\Omega^\dagger$ between the equivalent representations of the physical
Hilbert space of Quantum Mechanics (often, Fourier transformations), the
generalized non-unitary maps $\Omega \neq 1/\Omega^\dagger$ can also help to
simplify the analysis. We adapt the standard Dirac's notation and recollect the
Buslaev's and Grecchi's repulsive quartic oscillator Hamiltonian as an example.
Then we propose the whole new class of the models of the similar type,
characterized by a complexification of the path ${\cal C}$ of the (obviously,
not observable!) "coordinates". An exactly solvable potentialless
Schr\"{o}dinger equation is finally chosen for illustration. In it, the
dynamical (i.e., in our example, confining) role of the traditional potentials
$V(x)$ is shown to be taken over by the mere topologically nontrivial shape of
${\cal C}$. Our construction evokes several new open questions in physics
(${\cal PT}-$symmetric wave packets at a single energy?) as well as in
mathematics (a three-Hilbert-space generalized formulation of Quantum
Mechanics?).
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 10:37:10 GMT"
}
] | 2008-04-30T00:00:00 | [
[
"Znojil",
"Miloslav",
""
]
] | [
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] |
802.1319 | Ya'acov Ritov | Eitan Greenshtein and Ya'acov Ritov | Asymptotic efficiency of simple decisions for the compound decision
problem | null | null | null | null | math.ST stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the compound decision problem of estimating a vector of $n$
parameters, known up to a permutation, corresponding to $n$ independent
observations, and discuss the difference between two symmetric classes of
estimators. The first and larger class is restricted to the set of all
permutation invariant estimators. The second class is restricted further to
simple symmetric procedures. That is, estimators such that each parameter is
estimated by a function of the corresponding observation alone. We show that
under mild conditions, the minimal total squared error risks over these two
classes are asymptotically equivalent up to essentially O(1) difference.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 13:07:57 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Greenshtein",
"Eitan",
""
],
[
"Ritov",
"Ya'acov",
""
]
] | [
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] |
802.132 | Benjamin Braun | Benjamin Braun, Richard Ehrenborg | The Complex of Non-Crossing Diagonals of a Polygon | 5 pages, submitted | Journal of Combinatorial Theory, Series A Volume 117, Issue 6,
August 2010, Pages 642-649 | null | null | math.CO math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a convex n-gon P in the Euclidean plane, it is well known that the
simplicial complex \theta(P) with vertex set given by diagonals in P and facets
given by triangulations of P is the boundary complex of a polytope of dimension
n-3. We prove that for any non-convex polygonal region P with n vertices and
h+1 boundary components, \theta(P) is a ball of dimension n+3h-4. We also
provide a new proof that \theta(P) is a sphere when P is convex.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 14:03:35 GMT"
}
] | 2010-07-23T00:00:00 | [
[
"Braun",
"Benjamin",
""
],
[
"Ehrenborg",
"Richard",
""
]
] | [
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] |
802.1321 | Jouni Kainulainen | Jouni Kainulainen, Mika Juvela, Joao Alves | Near-infrared reddening of extra-galactic GMCs in a face-on geometry | 8 pages, 10 figures, accepted for publication in A&A. Added missing
histograms in Fig. 5 | null | 10.1051/0004-6361:20078896 | null | astro-ph | null | [Abridged] We describe the near-infrared reddening signature of giant
molecular clouds (GMCs) in external galaxies. In particular, we examine the
E(J-H) and E(H-K) color-excesses, and the effective extinction law observed in
discrete GMC regions. We also study the effect of the relative scale height of
the GMC distribution to the color-excesses, and to the observed mass function
of GMCs. We perform Monte Carlo radiative transfer simulations with 3D models
of stellar radiation and clumpy dust distributions, resembling a face-on
geometry. The scattered light is included in the models, and near-infrared
color maps are calculated from the simulated data. The effective near-infrared
reddening law, i.e. the ratio E(J-H)/E(H-K), has a value close to unity in GMC
regions. The ratio depends on the relative scale height of GMCs, xi, and for xi
values 0.1...0.75 we find the typical ratios of 0.6...1.1. The effective
extinction law turns out to be very flat in GMC regions. We find the ratios of
apparent extinctions of A(H)/A(K)=1.35...1.55 and A(J)/A(H)=1.15. The effect of
the scattered flux on the effective reddening law, as well as on the effective
extinction law, is significant. Regarding the GMC mass function, we find no
correlation between the input and observed slopes of the mass functions.
Rather, the observed slope reflects the parameter $\xi$ and the dynamical range
of the mass function. We estimate that only a fraction of 10...20 % of the
total mass of GMCs is recovered, if the observed color-excess values are
transformed to masses using the Galactic reddening law. In the case of
individual clouds the fraction can vary between ~0...50 %.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 14:05:21 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 20:23:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kainulainen",
"Jouni",
""
],
[
"Juvela",
"Mika",
""
],
[
"Alves",
"Joao",
""
]
] | [
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] |
802.1322 | Hossein Safari | N. Dadashi, H. Safari, S. Nasiri, and Y. Sobouti | Exact solutions for standing kink modes of the longitudinally stratified
coronal loops | 10 pages, 5 figure | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The influence of longitudinal structuring on the fast kink modes of coronal
loops is investigated. Analytical dispersion relations and mode profiles are
derived for the second-order ordinary differential equation governing the z-
component of the perturbation in the magnetic field, $\delta B_z$. All other
components are given in terms of $\delta B_z$. Deviations from the frequencies
and mode profiles of homogenous loops are given as functions of the density
scale height. The effects of the fixed and variable column masses, negative
scale heights, and density contrasts inside and outside of the loops are
studied. The frequency ratios, mode profiles, and the antinode shifts from
those of the sine profiles of the homogenous loops, are tools to estimate solar
photospheric parameters. To this end, we have expanded the relevant factors up
to the second order in the stratification parameter. In particular, we verify
that the first overtone antinode shifts are in the Mm range and are within the
reach of the resolutions of the present day observations.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 14:07:09 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Dadashi",
"N.",
""
],
[
"Safari",
"H.",
""
],
[
"Nasiri",
"S.",
""
],
[
"Sobouti",
"Y.",
""
]
] | [
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802.1323 | Daniel Groves | Martin R. Bridson and Daniel Groves | The quadratic isoperimetric inequality for mapping tori of free group
automorphisms | 188 pages, many figures. This is a monograph in three parts. The
three parts have been circulated for a number of years separately (and are
arXiv:math/0211459, arXiv:math/0507589 and arXiv:math/0610332). Memoirs of
the AMS, to appear | null | null | null | math.GR | null | If F is a finitely generated free group and \phi is an automorphism of F then
F \rtimes_\phi Z satisfties a quadratic isoperimetric inequality.
| [
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802.1324 | Chien Yu Chen | C. Y. Chen | Probe Annihilation process on noncommutative spacetime | This paper has been withdrawn | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper has been withdrawn by Chien-Yu, Chen due to the authors fields
error.
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802.1325 | Fernando Semi\~ao | F. L. Semi\~ao | Single mode two-channel cavity QED | 4 pages, 1 figure, typos fixed | J. Phys. B: At. Mol. Opt. Phys. 41 (2008) 081004 | null | null | quant-ph | null | In this short communication, a new type of two-channel cavity QED model is
derived. Two-channel models are important for they often lead to quantum
interference phenomena. The previous models relied on the use of two or more
modes of the quantized electromagnetic field, partially because of energy and
parity restrictions. As it is shown in this work, such restrictions may be
overcome with the use of properly chosen configurations of atomic levels and
the aplication of classical external fields. Competing one- and two-photon
processes involving one single mode may be obtained.
| [
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] |
802.1326 | George Ruppeiner | George Ruppeiner | Thermodynamic curvature and phase transitions in Kerr-Newman black holes | 29 pages, 8 figures | Phys.Rev.D78:024016,2008 | 10.1103/PhysRevD.78.024016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Singularities in the thermodynamics of Kerr-Newman black holes are commonly
associated with phase transitions. However, such interpretations are
complicated by a lack of stability and, more significantly, by a lack of
conclusive insight from microscopic models. Here, I focus on the later problem.
I use the thermodynamic Riemannian curvature scalar $R$ as a try to get
microscopic information from the known thermodynamics. The hope is that this
could facilitate matching black hole thermodynamics to known models of
statistical mechanics. For the Kerr-Newman black hole, the sign of $R$ is
mostly positive, in contrast to that for ordinary thermodynamic models, where
$R$ is mostly negative. Cases with negative $R$ include most of the simple
critical point models. An exception is the Fermi gas, which has positive $R$. I
demonstrate several exact correspondences between the two-dimensional Fermi gas
and the extremal Kerr-Newman black hole. $R$ diverges to $+\infty$ along curves
of diverging heat capacities $C_{J,\Phi}$ and $C_{\Omega,Q}$, but not along the
Davies curve of diverging $C_{J,Q}$. Finding statistical mechanical models with
like behavior might yield additional insight into the microscopic properties of
black holes. I also discuss a possible physical interpretation of $|R|$.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 15:28:50 GMT"
},
{
"version": "v2",
"created": "Wed, 14 May 2008 23:56:49 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Jul 2008 00:44:37 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ruppeiner",
"George",
""
]
] | [
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802.1327 | Satish Babu Korada | Satish Babu Korada, Ruediger Urbanke | Exchange of Limits: Why Iterative Decoding Works | 16 pages | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider communication over binary-input memoryless output-symmetric
channels using low-density parity-check codes and message-passing decoding. The
asymptotic (in the length) performance of such a combination for a fixed number
of iterations is given by density evolution. Letting the number of iterations
tend to infinity we get the density evolution threshold, the largest channel
parameter so that the bit error probability tends to zero as a function of the
iterations.
In practice we often work with short codes and perform a large number of
iterations. It is therefore interesting to consider what happens if in the
standard analysis we exchange the order in which the blocklength and the number
of iterations diverge to infinity. In particular, we can ask whether both
limits give the same threshold.
Although empirical observations strongly suggest that the exchange of limits
is valid for all channel parameters, we limit our discussion to channel
parameters below the density evolution threshold. Specifically, we show that
under some suitable technical conditions the bit error probability vanishes
below the density evolution threshold regardless of how the limit is taken.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 15:34:31 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Korada",
"Satish Babu",
""
],
[
"Urbanke",
"Ruediger",
""
]
] | [
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802.1328 | Yeo-Yie Charng | Yeo-Yie Charng, Da-Shin Lee, Chung Ngoc Leung, and Kin-Wang Ng | Affleck-Dine Baryogenesis, Split Supersymmetry, and Inflation | version accepted for publication in PRD | Phys.Rev.D80:063519,2009 | 10.1103/PhysRevD.80.063519 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that, in the context of split supersymmetry, a simple model with
a single complex scalar field can produce chaotic inflation and generate the
observed amount of baryon asymmetry via the Affleck-Dine mechanism. While the
inflaton quantum fluctuations give rise to curvature perturbation, we show that
quantum fluctuations of the phase of the scalar field can produce baryonic
isocurvature perturbation. Combining with constraints from WMAP data, all
parameters in the model can be determined to within a narrow range.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 15:47:04 GMT"
},
{
"version": "v2",
"created": "Tue, 27 Jan 2009 21:21:43 GMT"
},
{
"version": "v3",
"created": "Tue, 14 Jul 2009 13:30:41 GMT"
}
] | 2009-11-06T00:00:00 | [
[
"Charng",
"Yeo-Yie",
""
],
[
"Lee",
"Da-Shin",
""
],
[
"Leung",
"Chung Ngoc",
""
],
[
"Ng",
"Kin-Wang",
""
]
] | [
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] |
802.1329 | Jean-Christian Angl\`es d'Auriac | E. Preissmann, J.-Ch. Angl\`es d'Auriac, J.-M. Maillard | Birational Mappings and Matrix Sub-algebra from the Chiral Potts Model | 22 pages 0 figure The paper has been reorganized, splitting the
results into two sections : results pertaining to Physics and results
pertaining to Mathematics | null | 10.1063/1.3032564 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study birational transformations of the projective space originating from
lattice statistical mechanics, specifically from various chiral Potts models.
Associating these models to \emph{stable patterns} and \emph{signed-patterns},
we give general results which allow us to find \emph{all} chiral $q$-state
spin-edge Potts models when the number of states $q$ is a prime or the square
of a prime, as well as several $q$-dependent family of models. We also prove
the absence of monocolor stable signed-pattern with more than four states. This
demonstrates a conjecture about cyclic Hadamard matrices in a particular case.
The birational transformations associated to these lattice spin-edge models
show complexity reduction. In particular we recover a one-parameter family of
integrable transformations, for which we give a matrix representation
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:18:25 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Sep 2008 15:31:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Preissmann",
"E.",
""
],
[
"d'Auriac",
"J. -Ch. Anglès",
""
],
[
"Maillard",
"J. -M.",
""
]
] | [
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] |
802.133 | Levon Grigoryan | L. Grigoryan | The strange-sea quark spin distribution in the nucleon from inclusive
and semi-inclusive deep-inelastic scattering | null | Phys.Lett.B666:173-175,2008 | 10.1016/j.physletb.2008.07.012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose new method which allows determination of the strange-sea quark
spin distribution in the nucleon through measurement of various inclusive and
semi-inclusive polarized deep inelastic electron- or muon-proton reactions. It
is shown, that using combinations of inclusive data and semi-inclusive data
containing neutral pions in the final state, it is possible to extract the
strange-sea quark spin distribution. Similar result can be obtained for charged
pions and some other hadrons also.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 16:14:00 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 10:47:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grigoryan",
"L.",
""
]
] | [
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802.1331 | Gordon Ogilvie | Gordon I. Ogilvie and Adrian T. Potter | Magnetorotational-type instability in Couette-Taylor flow of a
viscoelastic polymer liquid | 4 pages, 4 figures, to be published in Physical Review Letters | Phys.Rev.Lett.100:074503,2008 | 10.1103/PhysRevLett.100.074503 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe an instability of viscoelastic Couette-Taylor flow that is
directly analogous to the magnetorotational instability (MRI) in astrophysical
magnetohydrodynamics, with polymer molecules playing the role of magnetic field
lines. By determining the conditions required for the onset of instability and
the properties of the preferred modes, we distinguish it from the centrifugal
and elastic instabilities studied previously. Experimental demonstration and
investigation should be much easier for the viscoelastic instability than for
the MRI in a liquid metal. The analogy holds with the case of a predominantly
toroidal magnetic field such as is expected in an accretion disk and it may be
possible to access a turbulent regime in which many modes are unstable.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 16:20:43 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Ogilvie",
"Gordon I.",
""
],
[
"Potter",
"Adrian T.",
""
]
] | [
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] |
802.1332 | Amy Glen | Michelangelo Bucci, Alessandro De Luca, Amy Glen, Luca Q. Zamboni | A connection between palindromic and factor complexity using return
words | 17 pages; minor adjustment to the main theorem and other minor
changes (particularly in Sections 3 and 4); accepted by "Advances in Applied
Mathematics" | Advances In Applied Mathematics 42 (2009) 60--74 | 10.1016/j.aam.2008.03.005 | null | math.CO cs.DM | null | In this paper we prove that for any infinite word W whose set of factors is
closed under reversal, the following conditions are equivalent:
(I) all complete returns to palindromes are palindromes;
(II) P(n) + P(n+1) = C(n+1) - C(n) + 2 for all n, where P (resp. C) denotes
the palindromic complexity (resp. factor complexity) function of W, which
counts the number of distinct palindromic factors (resp. factors) of each
length in W.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 17:17:59 GMT"
},
{
"version": "v2",
"created": "Fri, 11 Apr 2008 18:21:43 GMT"
}
] | 2010-04-08T00:00:00 | [
[
"Bucci",
"Michelangelo",
""
],
[
"De Luca",
"Alessandro",
""
],
[
"Glen",
"Amy",
""
],
[
"Zamboni",
"Luca Q.",
""
]
] | [
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] |
802.1333 | Gordon Ogilvie | Gordon I. Ogilvie | James Clerk Maxwell and the dynamics of astrophysical discs | 9 pages, to be published in Phil. Trans. R. Soc. A, based on the
meeting "Maxwell 150 Years On", Aberdeen, September 2006 | Phil.Trans.Roy.Soc.Lond.A366:1707-1715,2008 | 10.1098/rsta.2007.2180 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Maxwell's investigations into the stability of Saturn's rings provide one of
the earliest analyses of the dynamics of astrophysical discs. Current research
in planetary rings extends Maxwell's kinetic theory to treat dense granular
gases of particles undergoing moderately frequent inelastic collisions. Rather
than disrupting the rings, local instabilities may be responsible for
generating their irregular radial structure. Accretion discs around black holes
or compact stars consist of a plasma permeated by a tangled magnetic field and
may be compared with laboratory fluids through an analogy that connects
Maxwell's researches in electromagnetism and viscoelasticity. A common theme in
this work is the appearance of a complex fluid with a dynamical constitutive
equation relating the stress in the medium to the history of its deformation.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 16:24:38 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Ogilvie",
"Gordon I.",
""
]
] | [
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] |
802.1334 | Ettore Minguzzi | E. Minguzzi | An equivalent form of Young's inequality with upper bound | 5 pages. v2: Title changed to match published version. Previous
title: "Doubling Young's inequality" | Appl. Anal. Discrete Math. 2 (2008), 213--216. | 10.2298/AADM0802213M | null | math.GM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Young's integral inequality is complemented with an upper bound to the
remainder. The new inequality turns out to be equivalent to Young's inequality,
and the cases in which the equality holds become particularly transparent in
the new formulation.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 16:32:34 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Aug 2008 11:21:10 GMT"
}
] | 2008-09-11T00:00:00 | [
[
"Minguzzi",
"E.",
""
]
] | [
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] |
802.1335 | Annie Millet | Jinqiao Duan (IIT), Annie Millet (CES, Samos, Pma) | Large deviations for the Boussinesq Equations under Random Influences | 30 pages | Stochastic Processes and their Applications 119, 6 (2009)
2052-2081 | 10.1016/j.spa.2008.10.004 | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Boussinesq model for the Benard convection under random influences is
considered as a system of stochastic partial differential equations. This is a
coupled system of stochastic Navier-Stokes equations and the transport equation
for temperature. Large deviations are proved, using a weak convergence approach
based on a variational representation of functionals of infinite dimensional
Brownian motion.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 17:14:55 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Sep 2008 11:24:19 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Nov 2008 10:41:30 GMT"
}
] | 2009-05-12T00:00:00 | [
[
"Duan",
"Jinqiao",
"",
"IIT"
],
[
"Millet",
"Annie",
"",
"CES, Samos, Pma"
]
] | [
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] |
802.1336 | John Pearson | John Pearson, Jean Bellissard | Noncommutative Riemannian Geometry and Diffusion on Ultrametric Cantor
Sets | null | null | null | null | math.OA math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analogue of the Riemannian Geometry for an ultrametric Cantor set (C, d)
is described using the tools of Noncommutative Geometry. Associated with (C, d)
is a weighted rooted tree, its Michon tree. This tree allows to define a family
of spectral triples giving the Cantor set the structure of a noncommutative
Riemannian manifold. The family of spectral triples is indexed by the space of
choice functions which is shown to be the analogue of the sphere bundle of a
Riemannian manifold. The Connes metric coming from the Dirac operator D then
allows to recover the metric on C. The corresponding zeta function is shown to
have abscissa of convergence equal to the upper box dimension of (C, d). Taking
the residue at this singularity leads to the definition of a canonical
probability measure on C which in certain cases coincides with the Hausdorff
measure. This measure in turns induces a measure on the space of choices. Given
a choice, the commutator of D with a Lipschitz continuous function can be
intepreted as a directional derivative. By integrating over all choices, this
leads to the definition of an analogue of the Laplace-Beltrami operator. This
operator has compact resolvent and generates a Markov semigroup which plays the
role of a Brownian motion on C. This construction is applied to the simplest
case, the triadic Cantor set.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 17:15:48 GMT"
},
{
"version": "v2",
"created": "Tue, 6 May 2008 17:28:23 GMT"
}
] | 2008-05-06T00:00:00 | [
[
"Pearson",
"John",
""
],
[
"Bellissard",
"Jean",
""
]
] | [
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] |
802.1337 | Manjari Bagchi | Manjari Bagchi, Subharthi Ray, Jishnu Dey, Mira Dey | Strange Stars : An interesting member of the compact object family | Published in the proceedings of "Astrophysics Of Compact Objects: "
International Conference on Astrophysics of Compact Objects, July 1-7, 2007
Huangshan, China | AIP Conf.Proc.968:209-211,2008 | 10.1063/1.2840399 | null | astro-ph | null | We have studied strange star properties both at zero temperature and at
finite temperatures and searched signatures of strange stars in gamma-ray,
x-ray and radio astronomy. We have a set of Equations of State (EoS) for
strange quark matter (SQM) and solving the TOV equations, we get the structure
of strange stars. The maximum mass for a strange star decreases with the
increase of temperature, because at high temperatures, the EoS become softer.
One important aspect of strange star is that, surface tension depends on the
size and structure of the star and is significantly larger than the
conventional values. Moment of inertia is another important parameter for
compact stars as by comparing theoretical values with observed estimate, it is
possible to constrain the dense matter Equation of State. We hope that this
approach will help us to decide whether the members of the double pulsar system
PSR J0737-3039 are neutron stars or strange stars.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 18:19:24 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Bagchi",
"Manjari",
""
],
[
"Ray",
"Subharthi",
""
],
[
"Dey",
"Jishnu",
""
],
[
"Dey",
"Mira",
""
]
] | [
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] |
802.1338 | Shai Gutner | Shai Gutner and Michael Tarsi | Some results on (a:b)-choosability | null | null | null | null | cs.DM cs.CC cs.DS | null | A solution to a problem of Erd\H{o}s, Rubin and Taylor is obtained by showing
that if a graph $G$ is $(a:b)$-choosable, and $c/d > a/b$, then $G$ is not
necessarily $(c:d)$-choosable. Applying probabilistic methods, an upper bound
for the $k^{th}$ choice number of a graph is given. We also prove that a
directed graph with maximum outdegree $d$ and no odd directed cycle is
$(k(d+1):k)$-choosable for every $k \geq 1$. Other results presented in this
article are related to the strong choice number of graphs (a generalization of
the strong chromatic number). We conclude with complexity analysis of some
decision problems related to graph choosability.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 17:46:54 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Gutner",
"Shai",
""
],
[
"Tarsi",
"Michael",
""
]
] | [
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] |
802.1339 | Michael Kramer | O. Loehmer (1), A. Jessner (1), M. Kramer (2), R. Wielebinksi (1), O.
Maron (3) (1-Max-Planck-Institut fuer Radioastronomie, Bonn, Germany,
2-University of Manchester, Jodrell Bank Centre for Astrophysics, UK, 3-J.
Kepler Astronomical Centre, Zielona Gora, Poland) | Observations of pulsars at 9 millimetres | to appear in A&A (in press), 7 pages, 3 figures | null | 10.1051/0004-6361:20066806 | null | astro-ph | null | The behaviour of the pulsar spectrum at high radio frequencies can provide
decisive information about the nature of the radio emission mechanism. We
report recent observations of a selected sample of pulsars at lambda=9mm (32
GHz) with the 100-m Effelsberg radio telescope.Three pulsars, PSR B0144+59, PSR
B0823+26, and PSR B2022+50, were detected for the first time at this frequency.
We confirm the earlier flux density measurements for a sample of six pulsars,
and we are able to place upper flux density limits for another 12 pulsars. We
find that all pulsar spectra have a simple form that can be described using
only three parameters, one of which is the lifetime of short nano-pulses in the
emission region.The study of the transition region from coherent to incoherent
emission needs further and more sensitive observations at even higher radio
frequencies.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 18:30:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Loehmer",
"O.",
""
],
[
"Jessner",
"A.",
""
],
[
"Kramer",
"M.",
""
],
[
"Wielebinksi",
"R.",
""
],
[
"Maron",
"O.",
""
]
] | [
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] |
802.134 | Vladimir Dotsenko | Vladimir Dotsenko | A remark on Frobenius characters for set representations of symmetric
groups | 8 pages | null | null | null | math.RT math.CO | null | For any set representation (permutation representation) of the symmetric
group $S_n$, we give combinatorial interpretation for coefficients of its
Frobenius character expanded in the basis of monomial symmetric functions.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 18:48:47 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 13:53:56 GMT"
}
] | 2008-02-13T00:00:00 | [
[
"Dotsenko",
"Vladimir",
""
]
] | [
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802.1341 | Yi Lin | Thomas Baird, Yi Lin | Topology of generalized complex quotients | 33 pages, substantial changes made, expositions on twisted
equivariant cohomology improved | Journal of Geometry and Physics 60(10) (2010) 1539-1557 | 10.1016/j.geomphys.2010.05.002 | null | math.DG math.SG | http://creativecommons.org/licenses/publicdomain/ | Consider the Hamiltonian action of a torus on a compact twisted generalized
complex manifold $M$. We first observe that Kirwan injectivity and surjectivity
hold for ordinary equivariant cohomology in this setting. Then we prove that
these two results hold for the twisted equivariant cohomology as well.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 18:52:45 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Aug 2008 20:49:30 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Baird",
"Thomas",
""
],
[
"Lin",
"Yi",
""
]
] | [
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802.1342 | Andras Halbritter | P. Makk, Sz. Csonka, A. Halbritter | Interaction of hydrogen molecules with superconducting nanojunctions | 5 pages, 6 figures | null | null | null | cond-mat.mes-hall | null | In this paper the interaction of hydrogen molecules with atomic-sized
superconducting nanojunctions is studied. It is demonstrated by conductance
histogram measurements that the superconductors niobium, tantalum and aluminum
show a strong interaction with hydrogen, whereas for lead a slight interaction
is observed, and for tin and indium no significant interaction is detectable.
For Nb, Ta and Pb subgap method is applied to determine the transmission
eigenvalues of the nanojunctions in hydrogen environment. It is shown, that in
Nb and Ta the mechanical behavior of the junction is spectacularly influenced
by hydrogen reflected by extremely long conductance traces, but the electronic
properties based on the transmission eigenvalues are similar to those of pure
junctions. Evidences for the formation of a single-molecule bridge between the
electrodes -- as in recently studied platinum hydrogen system -- were not
found.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 19:38:42 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Makk",
"P.",
""
],
[
"Csonka",
"Sz.",
""
],
[
"Halbritter",
"A.",
""
]
] | [
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] |
802.1343 | Daniel Santavicca | D. F. Santavicca and D. E. Prober | Impedance-matched low-pass stripline filters | 9 pages, 4 figures | Measur.Sci.Tech.19:087001,2008 | 10.1088/0957-0233/19/8/087001 | null | physics.ins-det cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have constructed several impedance-matched low-pass filters using a
stripline geometry with a dissipative dielectric. The filters are compact,
simple to construct, and operate in cryogenic environments. The dissipative
dielectric consists of magnetically-loaded silicone or epoxy, which are
commercially available under the trade name Eccosorb. For a stripline length of
32 mm, the filters have a passband that extends from dc to a 3 dB bandwidth
between 0.3 and 0.8 GHz. The 3 dB bandwidth can be adjusted beyond this range
by changing the filter length. An extremely broad stopband at higher
frequencies, with attenuation exceeding 100 dB, is achieved along with a return
loss greater than 10 dB measured up to 40 GHz. This combination of high
attenuation and low reflected power across a broad stopband ensures that
spurious or unwanted signals outside the passband do not reach or return to the
device under test. This type of filter has applications in microwave frequency
measurements of sensitive non-linear devices such as superconducting heterodyne
mixers, quantum tunneling devices, and quantum computing elements.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 20:25:27 GMT"
},
{
"version": "v2",
"created": "Wed, 28 May 2008 15:47:57 GMT"
},
{
"version": "v3",
"created": "Thu, 12 Jun 2008 16:26:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Santavicca",
"D. F.",
""
],
[
"Prober",
"D. E.",
""
]
] | [
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] |
802.1344 | Louis-Francois Arsenault | Louis-Francois Arsenault, B. Movaghar, P. Desjardins and A. Yelon | Magnetotransport in the insulating regime of Mn doped GaAs | submitted to Phys. Rev. B, we changed the title, we corrected typos
and we added few explanations | Phys. Rev. B 78, 075202 (2008) | 10.1103/PhysRevB.78.075202 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider transport in the insulating regime of GaMnAs. We calculate the
resistance, magnetoresitance and Hall effect, assuming that the Fermi energy is
in the region of localized states above the valence band mobility edge. Both
hopping and activated band transport contributions are included. The anomalous
Hall current from band states is very different from the hopping Hall current
and has extrinsic (skew) and intrinsic (Luttinger) contributions. Comparison
with experiment allows us to assess the degree to which band and hopping
contribution determine each of the three transport coefficients in a particular
temperature range. There are strong indications that the insulating state
transport in GaMnAs is controlled primarily by extended state, band edge,
transport rather than by variable range hopping, as reported in the literature.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 19:59:50 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 05:59:21 GMT"
},
{
"version": "v3",
"created": "Wed, 9 Jul 2008 06:03:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Arsenault",
"Louis-Francois",
""
],
[
"Movaghar",
"B.",
""
],
[
"Desjardins",
"P.",
""
],
[
"Yelon",
"A.",
""
]
] | [
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] |
802.1345 | Colin Guillarmou | Colin Guillarmou (JAD), Fr\'ed\'eric Naud (LANLG) | Wave decay on convex co-compact hyperbolic manifolds | 18 pages | null | 10.1007/s00220-008-0706-z | null | math.AP math.DG | null | For convex co-compact hyperbolic quotients $X=\Gamma\backslash\hh^{n+1}$, we
analyze the long-time asymptotic of the solution of the wave equation $u(t)$
with smooth compactly supported initial data $f=(f_0,f_1)$. We show that, if
the Hausdorff dimension $\delta$ of the limit set is less than $n/2$, then
$u(t) = C_\delta(f) e^{(\delta-\ndemi)t} / \Gamma(\delta-n/2+1) +
e^{(\delta-\ndemi)t} R(t)$ where $C_{\delta}(f)\in C^\infty(X)$ and
$||R(t)||=\mc{O}(t^{-\infty})$. We explain, in terms of conformal theory of the
conformal infinity of $X$, the special cases $\delta\in n/2-\nn$ where the
leading asymptotic term vanishes. In a second part, we show for all $\eps>0$
the existence of an infinite number of resonances (and thus zeros of Selberg
zeta function) in the strip $\{-n\delta-\eps<\Re(\la)<\delta\}$. As a byproduct
we obtain a lower bound on the remainder $R(t)$ for generic initial data $f$.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 20:12:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Guillarmou",
"Colin",
"",
"JAD"
],
[
"Naud",
"Frédéric",
"",
"LANLG"
]
] | [
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] |
802.1346 | John Graham | J. F. Graham (1 and 2), A. S. Fruchter (1), A. J. Levan (3), M.
Nysewander (1), N. R. Tanvir (4), T. Dahlen (1), D. Bersier (5), A. Pe'er (1)
((1) Space Science Telescope Institute, (2) Johns Hopkins University, (3)
University of Warwick, (4) University of Leicester, (5) Liverpool John Moores
University) | GRB 070714B - Discovery of the Highest Spectroscopically Confirmed Short
Burst Redshift | Conference procedings for Gamma Ray Bursts 2007 November 5-9, 2007
Santa Fe, New Mexico (4 pages, 2 figures) | AIP Conf.Proc.1000:289-292,2008 | 10.1063/1.2943465 | null | astro-ph | null | Gemini Nod & Shuffle spectroscopy on the host of the short GRB 070714B shows
a single emission line at 7167 angstroms which, based on a grizJHK photometric
redshift, we conclude is the 3727 angstrom [O II] line. This places the host at
a redshift of z=.923 exceeding the previous record for the highest
spectroscopically confirmed short burst redshift of z=.546 held by GRB 051221.
This dramatically moves back the time at which we know short bursts were being
formed, and suggests that the present evidence for an old progenitor population
may be observationally biased.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 21:00:25 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Graham",
"J. F.",
"",
"1 and 2"
],
[
"Fruchter",
"A. S.",
""
],
[
"Levan",
"A. J.",
""
],
[
"Nysewander",
"M.",
""
],
[
"Tanvir",
"N. R.",
""
],
[
"Dahlen",
"T.",
""
],
[
"Bersier",
"D.",
""
],
[
"Pe'er",
"A.",
""
]
] | [
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] |
802.1347 | B. Svaiter F. | B. F. Svaiter | Fixed points in the family of convex representations of a maximal
monotone operator | 13 pages, updated references. Submited in July 2002 to Proc. AMS | Proceedings of the American Mathematical Society, 131 (2003), n.
12, 3851-3859 | 10.1090/S0002-9939-03-07083-7 | null | math.FA | null | Any maximal monotone operator can be characterized by a convex function. The
family of such convex functions is invariant under a transformation connected
with the Fenchel-Legendre conjugation. We prove that there exist a convex
representation of the operator which is a fixed point of this conjugation.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 20:18:48 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 14:19:59 GMT"
}
] | 2008-03-11T00:00:00 | [
[
"Svaiter",
"B. F.",
""
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802.1348 | Andrey Khilko | Andrey Khilko | Fourier-Based Spectral Analysis with Adaptive Resolution | 31 pages including 10 figures. Fixed problem with computational
complexity, so section 10 is rewritten and 3 more figures are added. Also, a
way of optimal computation is suggested. Corrected a couple of typos in
formulas. Several language and style corrections. Two additional references
are added | null | null | null | physics.data-an cs.NA math.GM | null | Despite being the most popular methods of data analysis, Fourier-based
techniques suffer from the problem of static resolution that is currently
believed to be a fundamental limitation of the Fourier Transform. Although
alternative solutions overcome this limitation, none provide the simplicity,
versatility, and convenience of the Fourier analysis. The lack of convenience
often prevents these alternatives from replacing classical spectral methods -
even in applications that suffer from the limitation of static resolution.
This work demonstrates that, contrary to the generally accepted belief, the
Fourier Transform can be generalized to the case of adaptive resolution. The
generalized transform provides backward compatibility with classical spectral
techniques and introduces minimal computational overhead.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 16:45:58 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jun 2008 15:51:46 GMT"
}
] | 2008-06-04T00:00:00 | [
[
"Khilko",
"Andrey",
""
]
] | [
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] |
802.1349 | Snezana Stanimirovic | Snezana Stanimirovic, Samantha Hoffman (UW Madison), Carl Heiles (UC
Berkeley), Kevin A. Douglas (SSL, UC Berkeley), Mary Putman (Univ. of
Michigan), Joshua E. G. Peek (UC Berkeley) | The many streams of the Magellanic Stream | Accepted by ApJ | null | 10.1086/587480 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results from neutral hydrogen (HI) observations of the tip of the
Magellanic Stream (MS), obtained with the Arecibo telescope as a part of the
on-going survey by the Consortium for Galactic studies with the Arecibo L-band
Feed Array. We find four large-scale, coherent HI streams, extending
continously over a length of 20 degrees, each stream possessing different
morphology and velocity gradients. The newly discovered streams provide strong
support for the tidal model of the MS formation by Connors et al. (2006), which
suggested a spatial and kinematic bifurcation of the MS. The observed
morphology and kinematics suggest that three of these streams could be
interpreted as a 3-way splitting of the main MS filament, while the fourth
stream appears much younger and may have originated from the Magellanic Bridge.
We find an extensive population of HI clouds at the tip of the MS. Two thirds
of clouds have an angular size in the range 3.5'--10'. We interpret this as
being due to thermal instability, which would affect a warm tail of gas
trailing through the Galactic halo over a characteristic timescale of a few
Myrs to a few hundred Myrs. We show that thermal fragments can survive in the
hot halo for a long time, especially if surrounded by a <10^6 K halo gas. If
the observed clumpy structure is mainly due to thermal instability, then the
tip of the MS is at a distance of ~70 kpc. A significant fraction of HI clouds
at the tip of the MS show multi-phase velocity profiles, indicating the
co-existence of cooler and warmer gas.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 20:26:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stanimirovic",
"Snezana",
"",
"UW Madison"
],
[
"Hoffman",
"Samantha",
"",
"UW Madison"
],
[
"Heiles",
"Carl",
"",
"UC\n Berkeley"
],
[
"Douglas",
"Kevin A.",
"",
"SSL, UC Berkeley"
],
[
"Putman",
"Mary",
"",
"Univ. of\n Michigan"
],
[
"Peek",
"Joshua E. G.",
"",
"UC Berkeley"
]
] | [
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802.135 | Ilya V. Tokatly | I. V. Tokatly | Equilibrium spin currents: Non-Abelian gauge invariance and color
diamagnetism in condensed matter | RevTeX, 4 pages | Phys. Rev. Lett. 101, 106601 (2008) | 10.1103/PhysRevLett.101.106601 | null | cond-mat.mes-hall | http://creativecommons.org/licenses/by/3.0/ | The spin-orbit (SO) interaction in condensed matter can be described in terms
of a non-Abelian potential known in high-energy physics as a color field. I
show that a magnetic component of this color field inevitably generates
diamagnetic color currents which are just the equilibrium spin currents
discussed in a condensed matter context. These dissipationless spin currents
thus represent a universal property of systems with SO interaction. In
semiconductors with linear SO coupling the spin currents are related to the
effective non-Abelian field via Yang-Mills magnetostatics equation.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 20:28:35 GMT"
}
] | 2013-12-10T00:00:00 | [
[
"Tokatly",
"I. V.",
""
]
] | [
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-0.0218172651,
0.0068843081
] |
802.1351 | Ferdinand Kuemmeth | F. Kuemmeth, S. Ilani, D. C. Ralph and P. L. McEuen | Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes | 14 pages, 6 figures | Nature 452, 448-452 (27 March 2008) | 10.1038/nature06822 | null | cond-mat.mes-hall | null | Electrons in atoms possess both spin and orbital degrees of freedom. In
non-relativistic quantum mechanics, these are independent, resulting in large
degeneracies in atomic spectra. However, relativistic effects couple the spin
and orbital motion leading to the well-known fine structure in their spectra.
The electronic states in defect-free carbon nanotubes (NTs) are widely believed
to be four-fold degenerate, due to independent spin and orbital symmetries, and
to also possess electron-hole symmetry. Here we report measurements
demonstrating that in clean NTs the spin and orbital motion of electrons are
coupled, thereby breaking all of these symmetries. This spin-orbit coupling is
directly observed as a splitting of the four-fold degeneracy of a single
electron in ultra-clean quantum dots. The coupling favours parallel alignment
of the orbital and spin magnetic moments for electrons and anti-parallel
alignment for holes. Our measurements are consistent with recent theories that
predict the existence of spin-orbit coupling in curved graphene and describe it
as a spin-dependent topological phase in NTs. Our findings have important
implications for spin-based applications in carbon-based systems, entailing new
design principles for the realization of qubits in NTs and providing a
mechanism for all-electrical control of spins in NTs.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 23:25:02 GMT"
}
] | 2008-04-07T00:00:00 | [
[
"Kuemmeth",
"F.",
""
],
[
"Ilani",
"S.",
""
],
[
"Ralph",
"D. C.",
""
],
[
"McEuen",
"P. L.",
""
]
] | [
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802.1352 | Danny Calegari | Danny Calegari | Stable commutator length is rational in free groups | 21 pages, 4 figures; version 2 incorporates referees' suggestions | Jour. Amer. Math. Soc. 22 (2009), no. 4, 941-961 | 10.1090/S0894-0347-09-00634-1 | null | math.GR math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For any group, there is a natural (pseudo-)norm on the vector space B1 of
real (group) 1-boundaries, called the stable commutator length norm. This norm
is closely related to, and can be thought of as a relative version of, the
Gromov (pseudo)-norm on (ordinary) homology. We show that for a free group, the
unit ball of this pseudo-norm is a rational polyhedron.
It follows that stable commutator length in free groups takes on only
rational values. Moreover every element of the commutator subgroup of a free
group rationally bounds an injective map of a surface group.
The proof of these facts yields an algorithm to compute stable commutator
length in free groups. Using this algorithm, we answer a well-known question of
Bavard in the negative, constructing explicit examples of elements in free
groups whose stable commutator length is not a half-integer.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 21:04:53 GMT"
},
{
"version": "v2",
"created": "Fri, 13 Mar 2009 16:14:32 GMT"
},
{
"version": "v3",
"created": "Sat, 14 Mar 2009 00:44:12 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Calegari",
"Danny",
""
]
] | [
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802.1353 | Degiovanni Luca | Claudia Chanu, Luca Degiovanni and Giovanni Rastelli | Superintegrable 3-body systems on the line | Corrected typos. Some improvements | null | 10.1063/1.3009575 | null | nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider classical three-body interactions on a Euclidean line depending
on the reciprocal distance of the particles and admitting four functionally
independent quadratic in the momenta first integrals. These systems are
superseparable (i.e. multiseparable), superintegrable and equivalent (up to
rescalings) to a one-particle system in the three-dimensional Euclidean space.
Common features of the dynamics are discussed. We show how to determine the
quantum symmetry operators associated with the first integrals considered here
but do not analyze the corresponding quantum dynamics. The conformal
superseparability is proved and examples of conformal first integrals are
given. The systems considered here in generality include the Calogero, Wolfes,
and other three-body interactions widely studied in mathematical physics.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 21:28:33 GMT"
},
{
"version": "v2",
"created": "Thu, 1 May 2008 18:42:11 GMT"
},
{
"version": "v3",
"created": "Sun, 11 May 2008 12:29:08 GMT"
},
{
"version": "v4",
"created": "Fri, 26 Sep 2008 19:50:22 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chanu",
"Claudia",
""
],
[
"Degiovanni",
"Luca",
""
],
[
"Rastelli",
"Giovanni",
""
]
] | [
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] |
802.1354 | Barry Madore | Barry F. Madore, Wendy L. Freedman and Gregory D. Bothun | Companions to Isolated Elliptical Galaxies: Revisiting the
Bothun-Sullivan Sample | First figures available in published version only | Astrophys.J.607:810,2004 | 10.1086/383486 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | (Abridged) We investigate the number of physical companion galaxies for a
sample of relatively isolated elliptical galaxies. NED has been used to
reinvestigate the incidence of satellite galaxies for a sample of 34 elliptical
galaxies, first investigated by Bothun & Sullivan in a visual search out to a
projected search radius of 75 kpc. We have repeated their original
investigation using data cataloged in NED. Nine of these elliptical galaxies
appear to be members of galaxy clusters; the remaining sample of 25 galaxies
reveals an average of +1.0+/-0.5 apparent companions per galaxy within a
projected search radius of 75 kpc, in excess of two equal-area comparison
regions displaced by 150-300 kpc. This is significantly larger than the
+0.12+/-0.42 companions/galaxy found by Bothun & Sullivan for the identical
sample. Making use of published radial velocities identifies physical
companions and gives a somewhat lower estimate of +0.4 companions per
elliptical galaxy. An expansion of the search radius out to 300 kpc.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 21:42:59 GMT"
}
] | 2009-06-25T00:00:00 | [
[
"Madore",
"Barry F.",
""
],
[
"Freedman",
"Wendy L.",
""
],
[
"Bothun",
"Gregory D.",
""
]
] | [
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] |
802.1355 | Bozidar Mitrovic | Bozidar Mitrovic | Effect of disorder on the far-infrared conductivity and on the microwave
conductivity of two-band superconductors | 11 pages, 6 figures | null | 10.1088/0953-8984/20/21/215220 | null | cond-mat.supr-con | null | We consider the far-infrared and the microwave conductivities of a two-band
superconductor with non-magnetic impurities. The strong coupling expressions
for the frequency and temperature dependent conductivity of a two-band
superconductor are developed assuming isotropic bands and interactions. Our
numerical results obtained using realistic interaction parameters for MgB$_{2}$
are compared with experiments on this compound. We find that the available
experimental results for the far-infrared conductivity of MgB$_{2}$ are
consistent with multi-band superconductivity in the presence of a sufficiently
strong interband impurity scattering. On the other hand, our numerical results
for the microwave conductivity in the superconducting state indicate that the
experimental results obtained on samples with the highest transition
temperature $T_{c}$ are consistent with a low interband impurity scattering
rate but depend sensitively on the ratio of the total scattering rates in the
two bands. For the $\pi$-band scattering rate $\gamma_{\pi}$ not greater than
the $\sigma$-band scattering rate $\gamma_{\sigma}$ there is a single, broad,
low-temperature (at about 0.5$T_{c}$) coherence peak in the microwave
conductivity. For $\gamma_{\pi}/\gamma_{\sigma}$=4--7 a high-temperature (at
about 0.9$T_{c}$) coherence peak is dominant, but there is also a
low-temperature peak/shoulder resulting from the contribution of the $\pi$-band
carriers to the microwave conductivity. For $\gamma_{\pi}/\gamma_{\sigma}\gg$1
only the high-temperature coherence peak should be observable.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:05:26 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Mar 2008 17:07:10 GMT"
},
{
"version": "v3",
"created": "Wed, 2 Apr 2008 19:58:47 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Mitrovic",
"Bozidar",
""
]
] | [
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] |
802.1356 | Bahram Mashhoon | Bahram Mashhoon | Time-Varying Gravitomagnetism | 10 pages; v2: slightly expanded version accepted for publication in
Class. Quantum Grav | Class.Quant.Grav.25:085014,2008 | 10.1088/0264-9381/25/8/085014 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Time-varying gravitomagnetic fields are considered within the linear
post-Newtonian approach to general relativity. A simple model is developed in
which the gravitomagnetic field of a localized mass-energy current varies
linearly with time. The implications of this temporal variation of the source
for the precession of test gyroscopes and the motion of null rays are briefly
discussed.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 22:58:07 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Mar 2008 00:57:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Mashhoon",
"Bahram",
""
]
] | [
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] |
802.1357 | Jean-Michel Marin | Lionel Cucala, Jean-Michel Marin, Christian Robert and Mike
Titterington | A Bayesian reassessment of nearest-neighbour classification | null | null | null | null | stat.CO math.ST stat.TH | null | The k-nearest-neighbour procedure is a well-known deterministic method used
in supervised classification. This paper proposes a reassessment of this
approach as a statistical technique derived from a proper probabilistic model;
in particular, we modify the assessment made in a previous analysis of this
method undertaken by Holmes and Adams (2002,2003), and evaluated by Manocha and
Girolami (2007), where the underlying probabilistic model is not completely
well-defined. Once a clear probabilistic basis for the k-nearest-neighbour
procedure is established, we derive computational tools for conducting Bayesian
inference on the parameters of the corresponding model. In particular, we
assess the difficulties inherent to pseudo-likelihood and to path sampling
approximations of an intractable normalising constant, and propose a perfect
sampling strategy to implement a correct MCMC sampler associated with our
model. If perfect sampling is not available, we suggest using a Gibbs sampling
approximation. Illustrations of the performance of the corresponding Bayesian
classifier are provided for several benchmark datasets, demonstrating in
particular the limitations of the pseudo-likelihood approximation in this
set-up.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 23:28:34 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Cucala",
"Lionel",
""
],
[
"Marin",
"Jean-Michel",
""
],
[
"Robert",
"Christian",
""
],
[
"Titterington",
"Mike",
""
]
] | [
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] |
802.1358 | Serguei Krasnikov | S. Krasnikov | Electrostatic interaction of a pointlike charge with a wormhole | The published version: 1) the regularity is proven 2) the part is
rewritten explaining where is the error in Khusnutdinov and Bakhmatov's
result | Class.Quant.Grav.25:245018,2008 | 10.1088/0264-9381/25/24/245018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A pointlike electric charge at rest is considered in the spacetime which is a
wormhole connecting two otherwise Minkowskian spaces. The potential (i. e. a
solution of the Maxwell equations) is split into two parts: one of them depends
only on the value and location of the charge, while the other, on the contrary,
does not change when the charge is quasistatically moved. Correspondingly, the
former is interpreted as being generated by the charge, and the latter as being
source-free. It is shown that all source-free potentials differ in the flux
through the throat (no "multipoles without multipoles"), which enables one to
interpret the flux as the "charge" of the wormhole in agreement with Wheeler's
concept of "charge without charge". The potential generated by the charge
differs from Coulomb's and thus a force (called "self-force") acts on the
charge even in the absence of the source-free field. This force is found
explicitly in the limit of vanishing throat length. The result differs from
that obtained recently by Khusnutdinov and Bakhmatov.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 23:24:44 GMT"
},
{
"version": "v2",
"created": "Wed, 7 Jan 2009 23:15:28 GMT"
}
] | 2009-01-08T00:00:00 | [
[
"Krasnikov",
"S.",
""
]
] | [
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] |
802.1359 | Can Peng | Can Peng, Shufeng Bai and Stephen Y. Chou | Fabrication and Characterization of Large Area Metallic Nano-Split-Ring
Arrays by Nanoimprint Lithography | 14 pages, 6 figures | null | null | null | physics.optics | null | This paper presents a novel method to parallel fabricate large area (wafer
scale) metallic nano-split-ring arrays with nanoimprint lithography (NIL). To
our knowledge it is the first method that can pattern large area and high dense
metallic split-ring arrays with advantages of high throughput, low-cost and
simplicity. This method makes metallic nano-split-ring arrays, which was
somehow conceptual before, practically useful. The optical properties of the
fabricated gold nano-split-ring arrays with different parameters were measured.
They show very obvious magnetic response to the incident light (which shows
10dB extinction ration in transmission spectra). The structure fabricated by
this method can generate magnetic response in optical range with relatively
large feature size that relax the requirement of resolution on lithography.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 23:54:52 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Peng",
"Can",
""
],
[
"Bai",
"Shufeng",
""
],
[
"Chou",
"Stephen Y.",
""
]
] | [
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] |
802.136 | Graeme Smith | Toby S. Cubitt, Mary-Beth Ruskai, and Graeme Smith | The structure of degradable quantum channels | 42 pages, 3 figures, Web and paper abstract differ; (v2 contains only
minor typo corrections) | J. Math. Phys. 49, 102104 (2008) | 10.1063/1.2953685 | null | quant-ph | null | Degradable quantum channels are among the only channels whose quantum and
private classical capacities are known. As such, determining the structure of
these channels is a pressing open question in quantum information theory. We
give a comprehensive review of what is currently known about the structure of
degradable quantum channels, including a number of new results as well as
alternate proofs of some known results. In the case of qubits, we provide a
complete characterization of all degradable channels with two dimensional
output, give a new proof that a qubit channel with two Kraus operators is
either degradable or anti-degradable and present a complete description of
anti-degradable unital qubit channels with a new proof.
For higher output dimensions we explore the relationship between the output
and environment dimensions ($d_B$ and $d_E$ respectively) of degradable
channels. For several broad classes of channels we show that they can be
modeled with a environment that is "small" in the sense $d_E \leq d_B$. Perhaps
surprisingly, we also present examples of degradable channels with ``large''
environments, in the sense that the minimal dimension $d_E > d_B$. Indeed, one
can have $d_E > \tfrac{1}{4} d_B^2$.
In the case of channels with diagonal Kraus operators, we describe the
subclass which are complements of entanglement breaking channels. We also
obtain a number of results for channels in the convex hull of conjugations with
generalized Pauli matrices. However, a number of open questions remain about
these channels and the more general case of random unitary channels.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 23:51:05 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Feb 2008 15:55:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cubitt",
"Toby S.",
""
],
[
"Ruskai",
"Mary-Beth",
""
],
[
"Smith",
"Graeme",
""
]
] | [
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802.1361 | Menelaos Karavelas | Menelaos I. Karavelas | Guarding curvilinear art galleries with edge or mobile guards via
2-dominance of triangulation graphs | 45 pages, 33 figures, short version has appeared in [M. I. Karavelas.
Guarding curvilinear art galleries with edge or mobile guards. 2008 ACM
Symposium on Solid and Physical Modeling (SPM08), 339-345, 2008.]; v2: new
lower bound for the edge 2-dominance problem which now matches the upper
bound | Comput. Geom. Theory Appl. 44(1):20-51, 2011 | 10.1016/j.comgeo.2010.07.002 | null | cs.CG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of monitoring an art gallery modeled as a polygon,
the edges of which are arcs of curves, with edge or mobile guards. Our focus is
on piecewise-convex polygons, i.e., polygons that are locally convex, except
possibly at the vertices, and their edges are convex arcs. We transform the
problem of monitoring a piecewise-convex polygon to the problem of 2-dominating
a properly defined triangulation graph with edges or diagonals, where
2-dominance requires that every triangle in the triangulation graph has at
least two of its vertices in its 2-dominating set. We show that
$\lfloor\frac{n+1}{3}\rfloor$ diagonal guards or $\lfloor\frac{2n+1}{5}\rfloor$
edge guards are always sufficient and sometimes necessary, in order to
2-dominate a triangulation graph. Furthermore, we show how to compute: a
diagonal 2-dominating set of size $\lfloor\frac{n+1}{3}\rfloor$ in linear time,
an edge 2-dominating set of size $\lfloor\frac{2n+1}{5}\rfloor$ in $O(n^2)$
time, and an edge 2-dominating set of size $\lfloor\frac{3n}{7}\rfloor$ in O(n)
time. Based on the above-mentioned results, we prove that, for piecewise-convex
polygons, we can compute: a mobile guard set of size
$\lfloor\frac{n+1}{3}\rfloor$ in $O(n\log{}n)$ time, an edge guard set of size
$\lfloor\frac{2n+1}{5}\rfloor$ in $O(n^2)$ time, and an edge guard set of size
$\lfloor\frac{3n}{7}\rfloor$ in $O(n\log{}n)$ time. Finally, we show that
$\lfloor\frac{n}{3}\rfloor$ mobile or $\lceil\frac{n}{3}\rceil$ edge guards are
sometimes necessary. When restricting our attention to monotone
piecewise-convex polygons, the bounds mentioned above drop:
$\lceil\frac{n+1}{4}\rceil$ edge or mobile guards are always sufficient and
sometimes necessary; such an edge or mobile guard set, of size at most
$\lceil\frac{n+1}{4}\rceil$, can be computed in O(n) time.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 00:40:37 GMT"
},
{
"version": "v2",
"created": "Tue, 20 Apr 2010 19:52:11 GMT"
}
] | 2011-03-01T00:00:00 | [
[
"Karavelas",
"Menelaos I.",
""
]
] | [
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-0.0166088194,
0.0029917341,
-0.0407841764,
-0.028951399,
0.0614445843,
0.015844116,
0.0046485914,
0.0054703117,
-0.0540658683,
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0.0636984482
] |
802.1362 | Lance Fortnow | Yiling Chen, Lance Fortnow, Nicolas Lambert, David M. Pennock,
Jennifer Wortman | Complexity of Combinatorial Market Makers | null | null | null | null | cs.GT | null | We analyze the computational complexity of market maker pricing algorithms
for combinatorial prediction markets. We focus on Hanson's popular logarithmic
market scoring rule market maker (LMSR). Our goal is to implicitly maintain
correct LMSR prices across an exponentially large outcome space. We examine
both permutation combinatorics, where outcomes are permutations of objects, and
Boolean combinatorics, where outcomes are combinations of binary events. We
look at three restrictive languages that limit what traders can bet on. Even
with severely limited languages, we find that LMSR pricing is $\SP$-hard, even
when the same language admits polynomial-time matching without the market
maker. We then propose an approximation technique for pricing permutation
markets based on a recent algorithm for online permutation learning. The
connections we draw between LMSR pricing and the vast literature on online
learning with expert advice may be of independent interest.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 00:23:17 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Chen",
"Yiling",
""
],
[
"Fortnow",
"Lance",
""
],
[
"Lambert",
"Nicolas",
""
],
[
"Pennock",
"David M.",
""
],
[
"Wortman",
"Jennifer",
""
]
] | [
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] |
802.1363 | Andreas Malmendier | Andreas Malmendier | The signature of the Seiberg-Witten surface | 22 pages | Surveys in differential geometry. Volume XV. Perspectives in
mathematics and physics, 255-277, Surv. Differ. Geom., 15, Int. Press,
Somerville, MA, 2011 | 10.4310/SDG.2010.v15.n1.a8 | null | math.DG hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Seiberg-Witten family of elliptic curves defines a Jacobian rational
elliptic surface $\Z$ over $\mathbb{C}\mathrm{P}^1$. We show that for the
$\bar{\partial}$-operator along the fiber the logarithm of the regularized
determinant $-1/2 \log \det' (\bar\partial^* \bar\partial)$ satisfies the
anomaly equation of the one-loop topological string amplitude derived in
Kodaira-Spencer theory. We also show that not only the determinant line bundle
with the Quillen metric but also the $\bar{\partial}$-operator itself extends
across the nodal fibers of $\mathrm{Z}$. The extension introduces current
contributions to the curvature of the determinant line bundle at the points
where the fibration develops nodal fibers. The global anomaly of the
determinant line bundle then determines the signature of $\mathrm{Z}$ which
equals minus the number of hypermultiplets.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 05:59:05 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 23:01:27 GMT"
},
{
"version": "v3",
"created": "Tue, 10 Mar 2009 09:06:29 GMT"
},
{
"version": "v4",
"created": "Mon, 16 Nov 2009 12:48:19 GMT"
},
{
"version": "v5",
"created": "Fri, 28 Oct 2011 02:07:47 GMT"
}
] | 2018-02-01T00:00:00 | [
[
"Malmendier",
"Andreas",
""
]
] | [
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] |
802.1364 | Dmitri Averin V. | Dmitri V. Averin and Jukka P. Pekola | Non-adiabadic charge pumping in a hybrid SET transistor | 5 pages, 4 included figures | null | 10.1103/PhysRevLett.101.066801 | null | cond-mat.mes-hall cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study theoretically current quantization in the charge turnstile based on
the hybrid (SINIS or NISIN) SET transistor. The quantization accuracy is
limited by either Andreev reflection or by Cooper pair - electron cotunneling.
The rates of these processes are calculated in the ``above-the-threshold''
regime when they compete directly with the lowest-order tunneling. We show that
by shaping the ac gate voltage driving the turnstile, it should be possible to
achieve the metrological accuracy of $10^{-8}$, while maintaining the absolute
value of the quantized current on the order of 30 pA, just by one turnstile
with realistic parameters using aluminium as superconductor.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 00:48:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Averin",
"Dmitri V.",
""
],
[
"Pekola",
"Jukka P.",
""
]
] | [
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] |
802.1365 | Clinton Van Siclen | Clinton DeW. Van Siclen | Stochastic method for accommodation of equilibrating basins in kinetic
Monte Carlo simulations | 4 pages, 1 figure | J. Phys.: Condens. Matter 19, 072201 (2007) | 10.1088/0953-8984/19/7/072201 | null | cond-mat.stat-mech cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A computationally simple way to accommodate 'basins' of trapping sites in
standard kinetic Monte Carlo simulations is presented. By assuming the system
is effectively equilibrated in the basin, the residence time (time spent in the
basin before escape) and the probabilities for transition to states outside the
basin may be calculated. This is demonstrated for point defect diffusion over a
periodic grid of sites containing a complex basin.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 01:24:32 GMT"
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] | 2008-02-12T00:00:00 | [
[
"Van Siclen",
"Clinton DeW.",
""
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802.1366 | Manfred Bucher | Manfred Bucher | Rise and fall of the old quantum theory | 34 pages, 12 figures | null | null | null | physics.hist-ph physics.ed-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The old quantum theory of Bohr and Sommerfeld was abandonned for the wrong
reason. Its contradictions were caused not by the orbit concept but by a mental
barrier--the inconceivability that an electron might collide with the atomic
nucleus. Removing that barrier resolves the theory's main failures--incorrect
orbital momenta, He atom, H2+ molecule ion. The inclusion of electron
oscillations through the nucleus--a concept called "Coulomb
oscillator"--renders the old quantum theory consistent with quantum mechanics
(although devoid of wave character). The triple success of the Bohr-Sommerfeld
model is its correct description of the H atom (and one-electron ions)
concerning (1) the energy levels Enl, (2) the orbital angular momenta Lnl--if
corrected as Lnl^2 = l(l+1) hbar^2 and with the Coulomb oscillator
included--and (3) the orbits' space quantization--with (Lnl)z = ml hbar. These
achievements are succinctly represented by the principal, angular and magnetic
quantum numbers (n, l, ml) and visualized by orbital ellipse geometry--major
axis, vertex curvature, and tilt angle, respectively. Orbit geometry also
accounts for the average orbit size. Moreover, the Coulomb oscillator provides
a natural explanation of (isotropic) hyperfine interaction. The shortcomings of
the old quantum theory lie in its neglect of three properties of
particles--their spin, their wave nature and their quantum statistics. These
deficiencies notwithstanding, the visual appeal of the Bohr-Sommerfeld model
remains a pedagogical asset to complement the abstract character of quantum
mechanics.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 01:46:03 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Bucher",
"Manfred",
""
]
] | [
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] |
802.1367 | Alexander Balandin | A. A. Balandin, S. Ghosh, W. Bao, I. Calizo, D. Teweldebrhan, F. Miao
and C. N. Lau | Extremely High Thermal Conductivity of Graphene: Experimental Study | null | Nano Letters, Vol. 8, No. 3,, 902-907 (2008) | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the first measurement of the thermal conductivity of a suspended
single layer graphene. The measurements were performed using a non-contact
optical technique. The near room-temperature values of the thermal conductivity
in the range ~ 4840 to 5300 W/mK were extracted for a single-layer graphene.
The extremely high value of the thermal conductivity suggests that graphene can
outperform carbon nanotubes in heat conduction.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 01:59:48 GMT"
}
] | 2008-03-15T00:00:00 | [
[
"Balandin",
"A. A.",
""
],
[
"Ghosh",
"S.",
""
],
[
"Bao",
"W.",
""
],
[
"Calizo",
"I.",
""
],
[
"Teweldebrhan",
"D.",
""
],
[
"Miao",
"F.",
""
],
[
"Lau",
"C. N.",
""
]
] | [
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] |
802.1368 | Shannon Starr | Matt Conomos and Shannon Starr | Asymptotics of the Spectral Gap for the Interchange Process on Large
Hypercubes | 17 pages. Updated proofs of inequalities, correcting errors | J. Statist. Mech., 2011, P10018 (2011) | 10.1088/1742-5468/2011/10/P10018 | null | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the interchange process (IP) on the $d$-dimensional, discrete
hypercube of side-length $n$. Specifically, we compare the spectral gap of the
IP to the spectral gap of the random walk (RW) on the same graph. We prove that
the two spectral gaps are asymptotically equivalent, in the limit $n \to
\infty$. This result gives further supporting evidence for a conjecture of
Aldous, that the spectral gap of the IP equals the spectral gap of the RW on
all finite graphs. Our proof is based on an argument invented by Handjani and
Jungreis, who proved Aldous's conjecture for all trees. This also has
implications for the spectral gap of the quantum Heisenberg ferromagnet.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 02:32:22 GMT"
},
{
"version": "v2",
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{
"version": "v3",
"created": "Wed, 24 Aug 2011 17:51:45 GMT"
},
{
"version": "v4",
"created": "Tue, 20 Sep 2011 21:36:37 GMT"
}
] | 2015-09-29T00:00:00 | [
[
"Conomos",
"Matt",
""
],
[
"Starr",
"Shannon",
""
]
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802.1369 | Pascal Vontobel | Pascal O. Vontobel | Interior-Point Algorithms for Linear-Programming Decoding | Essentially the paper that appeared in Proc. 2008 Information Theory
and Applications Workshop, UC San Diego, CA, USA, January 27 -- February 1,
2008 | null | null | null | cs.IT math.IT | null | Interior-point algorithms constitute a very interesting class of algorithms
for solving linear-programming problems. In this paper we study efficient
implementations of such algorithms for solving the linear program that appears
in the linear-programming decoder formulation.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 02:57:25 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Vontobel",
"Pascal O.",
""
]
] | [
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802.137 | Jeffrey Brock | Jeffrey Brock, Howard Masur, and Yair Minsky | Asymptotics of Weil-Petersson geodesics I: ending laminations,
recurrence, and flows | To appear, Geom. & Funct. Anal., referee's comments incorporated for
final version | null | null | null | math.GT math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define an ending lamination for a Weil-Petersson geodesic ray. Despite the
lack of a natural visual boundary for the Weil-Petersson metric, these ending
laminations provide an effective boundary theory that encodes much of its
asymptotic CAT(0) geometry. In particular, we prove an ending lamination
theorem (Theorem 1.1) for the full-measure set of rays that recur to the thick
part, and we show that the association of an ending lamination embeds asymptote
classes of recurrent rays into the Gromov-boundary of the curve complex. As an
application, we establish fundamentals of the topological dynamics of the
Weil-Petersson geodesic flow, showing density of closed orbits and topological
transitivity.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:56:58 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Nov 2008 22:25:07 GMT"
}
] | 2008-11-14T00:00:00 | [
[
"Brock",
"Jeffrey",
""
],
[
"Masur",
"Howard",
""
],
[
"Minsky",
"Yair",
""
]
] | [
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] |
802.1371 | Michael Bromley | J. Mitroy, J.Y. Zhang, M.W.J. Bromley, S.I. Young | Positron-atom scattering using pseudo-state energy shifts | 15 pages, 15 figures, submitted to PRA (updated following referee
comments) | null | 10.1103/PhysRevA.78.012715 | null | physics.atom-ph physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method to generate low-energy phase shifts for elastic scattering using
bound-state calculations is applied to the problem of e+ - Mg and e+ - Zn
scattering after an initial validation on the e+ - Cu system. The energy shift
between a small reference calculation and the largest possible configuration
interaction calculation of the lowest energy pseudo-state is used to tune a
semi-empirical optical potential. The potential was further fine-tuned by
utilizing the energy of the second lowest pseudo-state. The s- and p-wave phase
shifts for positron scattering from Mg and Zn are given from threshold to the
first excitation threshold. The e+ - Mg cross section has a prominent p-wave
shape resonance at an energy of about 0.096 eV with a width of 0.106 eV. The
peak cross section for e+ - Mg scattering is about 4800 a_0^2 while Z_eff
achieves a value of 1310 at an energy of 0.109 eV.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 03:18:38 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Apr 2008 17:45:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mitroy",
"J.",
""
],
[
"Zhang",
"J. Y.",
""
],
[
"Bromley",
"M. W. J.",
""
],
[
"Young",
"S. I.",
""
]
] | [
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] |
802.1372 | Yoshiyuki Kabashima | Yoshiyuki Kabashima | An integral formula for large random rectangular matrices and its
application to analysis of linear vector channels | Submitted to PHYSCOMNET08 | null | null | null | cs.IT cond-mat.dis-nn math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A statistical mechanical framework for analyzing random linear vector
channels is presented in a large system limit. The framework is based on the
assumptions that the left and right singular value bases of the rectangular
channel matrix $\bH$ are generated independently from uniform distributions
over Haar measures and the eigenvalues of $\bH^{\rm T}\bH$ asymptotically
follow a certain specific distribution. These assumptions make it possible to
characterize the communication performance of the channel utilizing an integral
formula with respect to $\bH$, which is analogous to the one introduced by
Marinari {\em et. al.} in {\em J. Phys. A} {\bf 27}, 7647 (1994) for large
random square (symmetric) matrices. A computationally feasible algorithm for
approximately decoding received signals based on the integral formula is also
provided.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 04:06:50 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 03:19:19 GMT"
}
] | 2008-02-21T00:00:00 | [
[
"Kabashima",
"Yoshiyuki",
""
]
] | [
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] |
802.1373 | Roby Cherian | Roby Cherian, Priya Mahadevan | Size dependence of lattice constants of semiconductor nanocrystals | Published in Applied physics letters | Appl. Phys. Lett. 92, 043130 (2008) | 10.1063/1.2839372 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have theoretically examined the size dependence of the equilibrium lattice
constant of nanocrystals of Si, GaAs and CdSe. While deviations from the bulk
lattice constant are as large as 1-2% for unpassivated nanocrystals of Si, the
deviations drop to ~ 0.3%-0.4% once the surfaces are passivated. Inspite of the
fact that the average equilibrium bond-lengths are bulk-like, we find that the
nearest-neighbor bond-length exhibits an unusual strain profile with bulk like
bond-lengths in the core and shorter (~ 1%) bonds at the surface.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 04:22:11 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Cherian",
"Roby",
""
],
[
"Mahadevan",
"Priya",
""
]
] | [
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] |
802.1374 | Jeroen M. Stil | J. M. Stil, A. R. Taylor, M. Krause, R. Beck | Polarisation of mJy radio sources | Contribution to MRU 2007, Manchester October 1-5 2007 5 pages, 3
figures | PoS MRU:069,2007 | null | null | astro-ph | null | Predictions of the number of faint polarised radio sources that can be
detected by SKA pathfinder telescopes and the SKA depend on the polarisation
properties of radio sources with a total flux density around 1 mJy. Total
intensity source counts suggest a transition in the dominant population from
AGN to galaxies around this flux density, and the properties of brighter radio
sources may not be representative for this fainter population. We show that
unresolved spiral galaxies can be highly polarised radio sources, up to ~ 20%
polarised at 4.8 GHz. This result is partly based on observations of nearby
galaxies, including galaxies with significant deviations from axial symmetry
and other peculiarities. A first analysis of polarised source counts divided
into steep-spectrum AGN, flat-spectrum AGN and star forming galaxies is
presented, including a prediction of polarised source counts to microjansky
levels.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 04:42:35 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Stil",
"J. M.",
""
],
[
"Taylor",
"A. R.",
""
],
[
"Krause",
"M.",
""
],
[
"Beck",
"R.",
""
]
] | [
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] |
802.1375 | Heinz Bauschke | Heinz H. Bauschke, Xianfu Wang, and Liangjin Yao | Autoconjugate representers for linear monotone operators | null | null | null | null | math.FA math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Monotone operators are of central importance in modern optimization and
nonlinear analysis. Their study has been revolutionized lately, due to the
systematic use of the Fitzpatrick function. Pioneered by Penot and Svaiter, a
topic of recent interest has been the representation of maximal monotone
operators by so-called autoconjugate functions. Two explicit constructions were
proposed, the first by Penot and Zalinescu in 2005, and another by Bauschke and
Wang in 2007. The former requires a mild constraint qualification while the
latter is based on the proximal average.
We show that these two autoconjugate representers must coincide for
continuous linear monotone operators on reflexive spaces. The continuity and
the linearity assumption are both essential as examples of discontinuous linear
operators and of subdifferential operators illustrate. Furthermore, we also
construct an infinite family of autoconjugate representers for the identity
operator on the real line.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 04:43:10 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Bauschke",
"Heinz H.",
""
],
[
"Wang",
"Xianfu",
""
],
[
"Yao",
"Liangjin",
""
]
] | [
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] |
802.1376 | Andres Rodriguez | Andres Rodriguez | Reducing False Alarms in Searches for Gravitational Waves from
Coalescing Binary Systems | 70 pages, 30 figures | M.S. Thesis (Advisor: Prof. Gabriela Gonzalez), Louisiana State
University, 2007 | null | LIGO-P070056-00-Z | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LIGO observatories in Livingston, LA and Hanford, WA may detect gravitational
waves emitted from coalescing binary systems composed of two compact objects.
In order to detect compact binary coalescence (CBC) events, LIGO searches
utilize matched filtering techniques. Matched filtering is the optimal
detection strategy for stationary, Gaussian noise, however, LIGO noise is often
non-stationary, non-Gaussian. Non-stationary noise result in an excess of false
candidate events, commonly known as false alarms. This thesis develops the r^2
test to reduce the false alarm rate for LIGO CBC searches. Results of the
search for primordial black hole binary systems (where each object has less
than 1M_solar), in LIGO's Third Science Run (S3) is also presented.
Results of the r^2 test are shown for several LIGO CBC searches, including
the binary neutron star searches in the Third and Fourth Science Runs (S3/S4),
the S3/S4 primordial black hole searches, and the binary black hole search in
the first three months of the Fifth Science Run (S5). The r^2 test
significantly reduces the false alarm rate in these searches, while only
falsely dismissing a small fraction of simulated events.
| [
{
"version": "v1",
"created": "Sun, 10 Feb 2008 19:51:08 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Rodriguez",
"Andres",
""
]
] | [
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] |
802.1377 | Yong Zhang | Yong Zhang, Chul Koo Kim, Kong-Ju-Bock Lee and Youngah Park | Resultant pressure distribution pattern along the basilar membrane in
the spiral shaped cochlea | 21 pages. (to appear in J. Biol. Phys.) | null | null | null | physics.bio-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cochlea is an important auditory organ in the inner ear. In most mammals, it
is coiled as a spiral. Whether this specific shape influences hearing is still
an open problem. By employing a three dimensional fluid model of the cochlea
with an idealized geometry, the influence of the spiral geometry of the cochlea
is examined. We obtain solutions of the model through a conformal
transformation in a long-wave approximation. Our results show that the net
pressure acting on the basilar membrane is not uniform along its spanwise
direction. Also, it is shown that the location of the maximum of the spanwise
pressure difference in the axial direction has a mode dependence. In the
simplest pattern, the present result is consistent with the previous theory
based on the WKB-like approximation [D. Manoussaki, Phys. Rev. Lett. 96,
088701(2006)]. In this mode, the pressure difference in the spanwise direction
is a monotonic function of the distance from the apex and the normal velocity
across the channel width is zero. Thus in the lowest order approximation, we
can neglect the existance of the Reissner's membrane in the upper channel.
However, higher responsive modes show different behavior and, thus, the real
maximum is expected to be located not exactly at the apex, but at a position
determined by the spiral geometry of the cochlea and the width of the cochlear
duct. In these modes, the spanwise normal velocities are not zero. Thus, it
indicates that one should take into account of the detailed geometry of the
cochlear duct for a more quantitative result. The present result clearly
demonstrates that not only the spiral geometry, but also the geometry of the
cochlear duct play decisive roles in distributing the wave energy.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 05:53:04 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Zhang",
"Yong",
""
],
[
"Kim",
"Chul Koo",
""
],
[
"Lee",
"Kong-Ju-Bock",
""
],
[
"Park",
"Youngah",
""
]
] | [
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] |
802.1378 | Chi-Te Liang | Kuang Yao Chen, Y. H. Chang, C.-T. Liang, N. Aoki, Y. Ochiai, C. F.
Huang, Li-Hung Lin, K. A. Cheng, H. H. Cheng, H. H. Lin, Jau-Yang Wu and
Sheng-Di Lin | Probing Landau quantisation with the presence of insulator-quantum Hall
transition in a GaAs two-dimensional electron system | 11 pages, 7 figures | J. Phys.: Condens. Matter 20 (2008) 295223. | 10.1088/0953-8984/20/29/295223 | null | cond-mat.mes-hall cond-mat.dis-nn | null | Magneto-transport measurements are performed on the two-dimensional electron
system (2DES) in an AlGaAs/GaAs heterostructure. By increasing the magnetic
field perpendicular to the 2DES, magnetoresistivity oscillations due to Landau
quantisation can be identified just near the direct insulator-quantum Hall
(I-QH) transition. However, different mobilities are obtained from the
oscillations and transition point. Our study shows that the direct I-QH
transition does not always correspond to the onset of strong localisation.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 06:10:17 GMT"
}
] | 2008-07-02T00:00:00 | [
[
"Chen",
"Kuang Yao",
""
],
[
"Chang",
"Y. H.",
""
],
[
"Liang",
"C. -T.",
""
],
[
"Aoki",
"N.",
""
],
[
"Ochiai",
"Y.",
""
],
[
"Huang",
"C. F.",
""
],
[
"Lin",
"Li-Hung",
""
],
[
"Cheng",
"K. A.",
""
],
[
"Cheng",
"H. H.",
""
],
[
"Lin",
"H. H.",
""
],
[
"Wu",
"Jau-Yang",
""
],
[
"Lin",
"Sheng-Di",
""
]
] | [
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] |
802.1379 | Qing Zhao | Qing Zhao, Bhaskar Krishnamachari | Structure and Optimality of Myopic Policy in Opportunistic Access with
Noisy Observations | Submitted to IEEE Transactions on Automatic Control | null | null | null | cs.NI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A restless multi-armed bandit problem that arises in multichannel
opportunistic communications is considered, where channels are modeled as
independent and identical Gilbert-Elliot channels and channel state
observations are subject to errors. A simple structure of the myopic policy is
established under a certain condition on the false alarm probability of the
channel state detector. It is shown that the myopic policy has a semi-universal
structure that reduces channel selection to a simple round-robin procedure and
obviates the need to know the underlying Markov transition probabilities. The
optimality of the myopic policy is proved for the case of two channels and
conjectured for the general case based on numerical examples.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 05:57:02 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Nov 2008 03:12:05 GMT"
}
] | 2008-11-13T00:00:00 | [
[
"Zhao",
"Qing",
""
],
[
"Krishnamachari",
"Bhaskar",
""
]
] | [
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] |
802.138 | Haim Permuter Henry | Haim H. Permuter, Tsachy Weissman and Jun Chen | New Bounds for the Capacity Region of the Finite-State Multiple Access
Channel | null | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The capacity region of the Finite-State Multiple Access Channel (FS-MAC) with
feedback that may be an arbitrary time-invariant function of the channel output
samples is considered. We provided a sequence of inner and outer bounds for
this region. These bounds are shown to coincide, and hence yield the capacity
region, of FS-MACs where the state process is stationary and ergodic and not
affected by the inputs, and for indecomposable FS-MAC when feedback is not
allowed.
Though the capacity region is `multi-letter' in general, our results yield
explicit conclusions when applied to specific scenarios of interest.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 06:25:25 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Permuter",
"Haim H.",
""
],
[
"Weissman",
"Tsachy",
""
],
[
"Chen",
"Jun",
""
]
] | [
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0.031197913,
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-0.0378927439,
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] |
802.1381 | Andrzej Kwasniewski | A. K. Kwasniewski | Comments on combinatorial interpretation of fibonomial coefficients - an
email style letter | 2 pages | Bulletin of the ICA vol. 42 September (2004) 10-11 | null | null | math.CO cs.DM math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Up to our knowledge -since about 126 years we were lacking of classical type
combinatorial interpretation of Fibonomial coefficients as it was Lukas
\cite{1} - to our knowledge -who was the first who had defined Finonomial
coefficients and derived a recurrence for them (see Historical Note in
\cite{2,3}). Here we inform that a join combinatorial interpretation was found
\cite{4} for all binomial-type coefficient - Fibonomial coefficients included.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 06:33:24 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Kwasniewski",
"A. K.",
""
]
] | [
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] |
802.1382 | Andrzej Kwasniewski | A. K. Kwasniewski | New type Stirling like numbers - an email style letter | 3 pages | Bulletin of the ICA Vol. 49 (2007), pp. 99-102 | null | null | math.CO cs.DM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The notion of the Fibonacci cobweb poset from [1] has been naturally extended
to any admissible sequence $F$ in [2] where it was also recognized that the
celebrated prefab notion of Bender and Goldman [3] - (see also [4,5]) - admits
such an extension so as to encompass the new type combinatorial objects from
[2] as leading examples. Recently the present author had introduced also [6]
two natural partial orders in there: one $\leq$ in grading-natural subsets of
cobweb`s prefabs sets [2] and in the second proposal one endows the set sums of
the so called "prefabiants" with such another partial order that one arrives at
Bell-like numbers including Fibonacci triad sequences introduced by the present
author in [7]. Here we quote the basic observations concerning the new type
Stirling like numbers as they appear in [6]. For more on notation, Stirling
like numbers of the first kind and for proofs - see [6].
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 06:50:05 GMT"
}
] | 2010-11-16T00:00:00 | [
[
"Kwasniewski",
"A. K.",
""
]
] | [
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] |
802.1383 | Haim Permuter Henry | Haim H. Permuter, Young-Han Kim and Tsachy Weissman | On Directed Information and Gambling | null | null | null | null | cs.IT math.IT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the problem of gambling in horse races with causal side information
and show that Massey's directed information characterizes the increment in the
maximum achievable capital growth rate due to the availability of side
information. This result gives a natural interpretation of directed information
$I(Y^n \to X^n)$ as the amount of information that $Y^n$ \emph{causally}
provides about $X^n$. Extensions to stock market portfolio strategies and data
compression with causal side information are also discussed.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 06:52:47 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Permuter",
"Haim H.",
""
],
[
"Kim",
"Young-Han",
""
],
[
"Weissman",
"Tsachy",
""
]
] | [
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] |
802.1384 | Jung-Wan Ryu | Jung-Wan Ryu, Sunghwan Rim, Young-Jai Park, Chil-Min Kim, and
Soo-Young Lee | Resonances in a circular dielectric cavity | 10 pages, 7 figures | null | 10.1016/j.physleta.2008.02.018 | null | physics.optics | null | We study resonance distributions in a circular dielectric cavity. It is shown
that the decay-rate distribution has a peak structure and the details of the
peak are consistent with the classical survival probability time distribution.
We also investigate the behavior of the complex resonance positions at the
small opening limit. At the large $n$ limit, the real part of complex resonance
positions approaches the solutions with different $m$ of Dirichlet problem with
a scale $n^{-2}$ and the imaginary part goes zero as $n^{-2m}$ for TM and
$n^{-2(m+1)}$ for TE polarization, where $m$ is the order of the resonance.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 07:29:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ryu",
"Jung-Wan",
""
],
[
"Rim",
"Sunghwan",
""
],
[
"Park",
"Young-Jai",
""
],
[
"Kim",
"Chil-Min",
""
],
[
"Lee",
"Soo-Young",
""
]
] | [
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] |
802.1385 | Malysheva Lyuba I. | Lyuba Malysheva and Alexander Onipko | Dispersion of "Dispersionless Zero Mode": Comments on L. Brey and H.A.
Fertig paper Electronic States of Graphene Nanoribbons Studied With The Dirac
Equation | Editing | null | null | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a particular application of the earlier proposed model of graphene as a
macromolecule, we found the exact analytical expression of dispersion relation
for the band of edge states in graphene zigzag ribbons. This band is often
referred to as "dispersionless band" or "zero mode". The obtained result
contrasts description of edge states given in the referenced paper, showing
that the earlier given explanation is valid only for a very narrow region of
values of the electron/hole wave vector, but for the rest, it is not correct.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:13:11 GMT"
},
{
"version": "v2",
"created": "Thu, 8 May 2008 11:25:20 GMT"
}
] | 2008-05-08T00:00:00 | [
[
"Malysheva",
"Lyuba",
""
],
[
"Onipko",
"Alexander",
""
]
] | [
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] |
802.1386 | Yannick Letawe | Y. Letawe (1), P. Magain (1), G. Letawe (1), F. Courbin (2) and D.
Hutsem\'ekers (1) ((1) Universit\'e de Li\`ege, Belgium, (2) Ecole
Polytechnique F\'ed\'erale de Lausanne (EPFL), Switzerland) | Understanding the relations between QSOs and their host galaxies from
combined HST imaging and VLT spectroscopy | Accepted for publication in ApJ. 31 pages, 17 figures, 3 tables | null | 10.1086/587866 | null | astro-ph | null | The host galaxies of six nearby QSOs are studied on the basis of high
resolution HST optical images and spatially resolved VLT slit spectra. The gas
ionization and velocity are mapped as a function of the distance to the central
QSO. In the majority of the cases, the QSO significantly contributes to the gas
ionization in its whole host galaxy, and sometimes even outside.
Reflection or scattering of the QSO \ha line from remote regions of the
galaxy is detected in several instances. The line shifts show that, in all
cases, the matter responsible for the light reflection moves away from the QSO,
likely accelerated by its radiation pressure.
The two faintest QSOs reside in spirals, with some signs of a past
gravitational perturbation. One of the intermediate luminosity QSOs resides in
a massive elliptical containing gas ionized (and probably pushed away) by the
QSO radiation. The other medium-power object is found in a spiral galaxy
displaying complex velocity structure, with the central QSO moving with respect
to the bulge, probably as a result of a galactic collision. The two most
powerful objects are involved in violent gravitational interactions and one of
them has no detected host.
These results suggest that (1) large-scale phenomena, such as galactic
collisions, are closely related to the triggering and the feeding of the QSO
and (2) once ignited, the QSO has significant influence on its large-scale
neighborhood (often the whole host and sometimes further away).
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 08:35:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Letawe",
"Y.",
""
],
[
"Magain",
"P.",
""
],
[
"Letawe",
"G.",
""
],
[
"Courbin",
"F.",
""
],
[
"Hutsemékers",
"D.",
""
]
] | [
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] |
802.1387 | Anne Jaigu | Nathalie Mitton (INRIA Futurs), Katy Paroux (LM-Besan\c{c}on), Bruno
Sericola (IRISA), S\'ebastien Tixeuil (INRIA Futurs) | Ascending runs in dependent uniformly distributed random variables:
Application to wireless networks | null | null | null | null | cs.DM cs.NI math.CO math.PR | null | We analyze in this paper the longest increasing contiguous sequence or
maximal ascending run of random variables with common uniform distribution but
not independent. Their dependence is characterized by the fact that two
successive random variables cannot take the same value. Using a Markov chain
approach, we study the distribution of the maximal ascending run and we develop
an algorithm to compute it. This problem comes from the analysis of several
self-organizing protocols designed for large-scale wireless sensor networks,
and we show how our results apply to this domain.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 15:08:20 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Feb 2008 15:20:45 GMT"
}
] | 2008-02-25T00:00:00 | [
[
"Mitton",
"Nathalie",
"",
"INRIA Futurs"
],
[
"Paroux",
"Katy",
"",
"LM-Besançon"
],
[
"Sericola",
"Bruno",
"",
"IRISA"
],
[
"Tixeuil",
"Sébastien",
"",
"INRIA Futurs"
]
] | [
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] |
802.1388 | Jean-Marc Bardet | Jean-Marc Bardet (CES, SAMOS), Pierre Bertrand (LMA-Clermont),
V\'eronique Billat (LEPHE) | Estimation non-param\'etrique de la densit\'e spectrale d'un processus
gaussien \'echantillonn\'e al\'eatoirement | null | Annales I.S.U.P. (2008) 1-12 | null | null | math.ST stat.TH | null | From a wavelet analysis, one derives a nonparametrical estimator for the
spectral density of a Gaussian process with stationary increments. First, the
idealistic case of a continuous time path of the process is considered. A
punctual Central Limit Theorem (CLT) and an estimation of the Mean Integrate
Square Error (MISE) are established. Next, to fit the applications, one
considers the case where one observes a path at random times. One built a
second estimator obtained by replacing the wavelet coefficients by their
discretizations. A second CLT and the corresponding estimation of the MISE are
provided. Finally, simulation results and an application on the heartbeat time
series of marathon runners are presented.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 08:21:59 GMT"
}
] | 2008-07-03T00:00:00 | [
[
"Bardet",
"Jean-Marc",
"",
"CES, SAMOS"
],
[
"Bertrand",
"Pierre",
"",
"LMA-Clermont"
],
[
"Billat",
"Véronique",
"",
"LEPHE"
]
] | [
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] |
802.1389 | Svante Janson | Svante Janson, Christian Lavault, Guy Louchard | Convergence of some leader election algorithms | 27 pages, 13 figures, 5 tables | null | null | null | cs.DC math.PR | null | We start with a set of n players. With some probability P(n,k), we kill n-k
players; the other ones stay alive, and we repeat with them. What is the
distribution of the number X_n of phases (or rounds) before getting only one
player? We present a probabilistic analysis of this algorithm under some
conditions on the probability distributions P(n,k), including stochastic
monotonicity and the assumption that roughly a fixed proportion alpha of the
players survive in each round.
We prove a kind of convergence in distribution for X_n-log_a n, where the
basis a=1/alpha; as in many other similar problems there are oscillations and
no true limit distribution, but suitable subsequences converge, and there is an
absolutely continuous random variable Z such that the distribution of X_n can
be approximated by Z+log_a n rounded to the nearest larger integer.
Applications of the general result include the leader election algorithm
where players are eliminated by independent coin tosses and a variation of the
leader election algorithm proposed by W.R. Franklin. We study the latter
algorithm further, including numerical results.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 11:01:11 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Janson",
"Svante",
""
],
[
"Lavault",
"Christian",
""
],
[
"Louchard",
"Guy",
""
]
] | [
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] |
802.139 | Huw Price | Huw Price | Decisions, Decisions, Decisions: Can Savage Salvage Everettian
Probability? | 22 pages, 1 figure, based on talk presented at the Many Worlds at 50
conference, Perimeter Institute, September 2007 | null | null | null | quant-ph | null | Critics object that the Everett view cannot make sense of quantum
probabilities, in one or both of two ways: either it cannot make sense of
probability at all, or it cannot explain why probability should be governed by
the Born rule. David Deutsch has attempted to meet these objections by
appealing to an Everettian version of Savage's rational decision theory.
Deutsch argues not only that an analogue of classical decision under
uncertainty makes sense in an Everett world; but also that under reasonable
assumptions, the betting odds of a rational Everettian agent should be
constrained by the Born rule. Deutsch's proposal has been defended and
developed by David Wallace, and in a different form by Hilary Greaves. In this
paper I offer some objections to the Deutsch-Wallace-Greaves argument,
focussing in particular on the supposed analogy with classical decision under
uncertainty.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 08:35:55 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Price",
"Huw",
""
]
] | [
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802.1391 | Juri Poutanen | Juri Poutanen, Andrzej A. Zdziarski, Askar Ibragimov | Superorbital variability of X-ray and radio emission of Cyg X-1 - II.
Dependence of the orbital modulation and spectral hardness on the
superorbital phase | 12 pages, 9 figures, accepted for publication in MNRAS. Dependence of
the spectral hardness on superorbital phase is added | Mon. Not. Royal Astr. Soc. (2008) 389, 1427 | 10.1111/j.1365-2966.2008.13666.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discover a pronounced dependence of the strength of the X-ray orbital
modulation and the hardness in Cyg X-1 in the hard state on its superorbital
phase. Our results can be well modelled as a combination of two effects: the
precession of the accretion disc (which causes the superorbital flux
modulation) and the orbital-phase dependent X-ray absorption in an accretion
bulge, located at the accretion disc edge close to the supergiant companion but
displaced from the line connecting the stars by about 25^o. Our findings are
supported by the distribution of the X-ray dips showing concentration towards
zero superorbital phase, which corresponds to the bulge passing through the
line of sight. We Fourier analyse our model, and find it explains the previous
finding of asymmetric beat (between the orbital and superorbital modulations)
frequencies in the observed power spectrum, provided the disc precession is
prograde. We find no statistically significant changes of the orbital
modulation with the superorbital phase in the 15-GHz radio data. This absence
is consistent with the radio being emitted by a jet in the system, in which
case the orbital modulation is caused by wind absorption far away from the
disc. We also find that both the X-ray and radio fluxes of Cyg X-1 in the hard
state on time scales >10^4-s have lognormal distributions, which complements a
previous finding of a lognormal flux distribution in the hard state on 1-s time
scales. We point out that the lognormal character of the flux distribution
requires that flux logarithms rather than fluxes themselves should be used for
averaging and error analysis. We also provide a correct formula for the
uncertainty of rms of a light curve for the case when the uncertainty is higher
than the measurement.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 20:25:10 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Jul 2008 10:54:13 GMT"
}
] | 2008-11-27T00:00:00 | [
[
"Poutanen",
"Juri",
""
],
[
"Zdziarski",
"Andrzej A.",
""
],
[
"Ibragimov",
"Askar",
""
]
] | [
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802.1392 | Delsate T\'erence | Terence Delsate | Perturbative non uniform black strings in ${AdS}_6$ | 10 pages, 2 figures | Phys.Lett.B663:118-124,2008 | 10.1016/j.physletb.2008.03.047 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the non uniform AdS black string solution with a perturbation
theory in six dimensions, focusing on the backreacting second order correction.
The backreactions at second order give the first relevant corrections to the
thermodynamical quantities. Our results show that for configurations with
horizon radius and length in the extradimension small compared to the AdS
radius, the properties of the non uniform black string are similar to the
locally asymptotically flat case. For black strings with small horizon radial
coordinate but large length in the extradimension, the thermodynamical
properties of the solutions are affected by the AdS curvature.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 08:43:41 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Mar 2008 16:17:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Delsate",
"Terence",
""
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] |
802.1393 | Clement Jonquet | Cl\'ement Jonquet (LIRMM), Stefano A. Cerri (LIRMM) | Les Agents comme des interpr\'eteurs Scheme : Sp\'ecification dynamique
par la communication | null | Dans 14\`eme Congr\`es Francophone AFRIF-AFIA de Reconnaissance
des Formes et Intelligence Artificielle - RFIA'04, Toulouse : France (2004) | null | null | cs.MA cs.AI | null | We proposed in previous papers an extension and an implementation of the
STROBE model, which regards the Agents as Scheme interpreters. These Agents are
able to interpret messages in a dedicated environment including an interpreter
that learns from the current conversation therefore representing evolving
meta-level Agent's knowledge. When the Agent's interpreter is a
nondeterministic one, the dialogues may consist of subsequent refinements of
specifications in the form of constraint sets. The paper presents a worked out
example of dynamic service generation - such as necessary on Grids - by
exploiting STROBE Agents equipped with a nondeterministic interpreter. It shows
how enabling dynamic specification of a problem. Then it illustrates how these
principles could be effective for other applications. Details of the
implementation are not provided here, but are available.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 08:55:46 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Jonquet",
"Clément",
"",
"LIRMM"
],
[
"Cerri",
"Stefano A.",
"",
"LIRMM"
]
] | [
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802.1394 | Eric Jaligot | Adrien Deloro, Eric Jaligot (ICJ) | Groups of finite Morley rank with solvable local subgroups | null | null | null | null | math.GR | null | We lay down the fundations of the theory of groups of finite Morley rank in
which local subgroups are solvable and we proceed to the local analysis of
these groups. We prove the main Uniqueness Theorem, analogous to the Bender
method in finite group theory, and derive its corollaries. We also consider
homogeneous cases as well as torsion.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 08:58:48 GMT"
},
{
"version": "v2",
"created": "Fri, 29 Feb 2008 18:02:29 GMT"
},
{
"version": "v3",
"created": "Thu, 27 Mar 2008 07:29:06 GMT"
}
] | 2008-03-27T00:00:00 | [
[
"Deloro",
"Adrien",
"",
"ICJ"
],
[
"Jaligot",
"Eric",
"",
"ICJ"
]
] | [
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] |
802.1395 | Constantinescu | Florin Constantinescu | Supersymmetric Quantum Field Theory: Indefinite Metric | 44 pages, minor corrections, to appear Annales Henri Poincare | Annales Henri Poincare 10:955-994,2009 | 10.1007/s00023-009-0003-1 | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the recently introduced Krein structure (indefinite metric) of the
N=1 supersymmetry and present the way into physical applications outside path
integral methods. From the mathematical point of view some perspectives are
mentioned at the end of the paper.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 09:00:37 GMT"
},
{
"version": "v2",
"created": "Sat, 31 May 2008 18:17:54 GMT"
},
{
"version": "v3",
"created": "Tue, 12 Aug 2008 16:33:48 GMT"
},
{
"version": "v4",
"created": "Fri, 26 Jun 2009 05:36:37 GMT"
}
] | 2009-09-28T00:00:00 | [
[
"Constantinescu",
"Florin",
""
]
] | [
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802.1396 | John Schliemann | John Schliemann | Cyclotron motion in graphene | 6 pages, 1 figure included | New J. Phys. 10, 043024 (2008) | 10.1088/1367-2630/10/4/043024 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cyclotron motion in graphene monolayers considering both the
full quantum dynamics and its semiclassical limit reached at high carrier
energies. Effects of zitterbewegung due to the two dispersion branches of the
spectrum dominate the irregular quantum motion at low energies and are obtained
as a systematic correction to the semiclassical case. Recent experiments are
shown to operate in the semiclassical regime.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 09:08:25 GMT"
}
] | 2008-04-16T00:00:00 | [
[
"Schliemann",
"John",
""
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802.1397 | Nijo Varghese Mr. | Nijo Varghese and V. C. Kuriakose | Massive Charged Scalar Quasinormal Modes of Reissner-N\"ordstrom Black
Hole Surrounded by Quintessence | 9 pages, 9 figures and one table | Gen.Rel.Grav.41:1249,2009 | 10.1007/s10714-008-0702-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the complex frequencies of the normal modes for the massive
charged scalar field perturbations around a Reissner-N\"ordstrom black hole
surrounded by a static and spherically symmetric quintessence using third order
WKB approximation approach. Due to the presence of quintessence, quasinormal
frequencies damp more slowly. We studied the variation of quasinormal
frequencies with charge of the black bole, mass and charge of perturbating
scalar field and the quintessential state parameter.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 09:21:59 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Varghese",
"Nijo",
""
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[
"Kuriakose",
"V. C.",
""
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802.1398 | Parthasarathi Majumdar | Parthasarathi Majumdar | Holography, CFT and Black Hole Entropy | 17 pages Latex2e with 3 eps figures; based on invited lectures given
at the Platinum Jubilee International Conference on Theoretical Physics at
ISI, Kolkata, India, December 2007 and the International Conference on
Quantum Gauge Theories at the SNBNCBS, Kolkata, India, January 2008 | null | null | null | gr-qc | null | Aspects of holography or dimensional reduction in gravitational physics are
discussed with reference to black hole thermodynamics. Degrees of freedom
living on Isolated Horizons (as a model for macroscopic, generic, eternal black
hole horizons) are argued to be topological in nature and counted, using their
relation to two dimensional conformal field theories. This leads to the
microcanonical entropy of these black holes having the Bekenstein-Hawking form
together with finite, unambigious {\it quantum spacetime} corrections. Another
aspect of holography ensues for radiant black holes treated as a standard
canonical ensemble with Isolated Horizons as the mean (equilibrium)
configuration. This is shown to yield a universal criterion for thermal
stability of generic radiant black holes, as a lower bound on the mass of the
equilibrium isolated horizon in terms of its microcanonical entropy. Saturation
of the bound occurs at a phase boundary separating thermally stable and
unstable phases with symptoms of a first order phase transition.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 10:05:29 GMT"
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] | 2008-02-12T00:00:00 | [
[
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] |
802.1399 | Andrea Chiavassa Mr | A. Chiavassa | Atmospheric dynamics of red supergiant stars and Interferometry | 6 pages, Perspectives in Radiative Transfer and Interferometry, EAS
publication series | null | 10.1051/eas:0828005 | null | astro-ph | null | We developed a 3D pure LTE radiative transfer code to derive observables
expected for RSGs, with emphasis on small scale structures, from
radiative-hydrodynamic (RHD) simulations of red supergiant stars (RSGs) carried
out with CO5BOLD (Freytag et al. 2002). We show that the convection-related
surface structures are observable with today's interferometers. Moreover, the
RHD simulations are a great improvement over parametric models for the
interpretation of interferometric observations.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 10:42:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chiavassa",
"A.",
""
]
] | [
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] |
802.14 | Damian Rossler | Henri Gillet, Damian R\"ossler, C. Soul\'e | An arithmetic Riemann-Roch theorem in higher degrees | null | null | null | null | math.AG math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove an analogue in Arakelov geometry of the Grothendieck-Riemann-Roch
theorem.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 09:54:34 GMT"
}
] | 2008-02-12T00:00:00 | [
[
"Gillet",
"Henri",
""
],
[
"Rössler",
"Damian",
""
],
[
"Soulé",
"C.",
""
]
] | [
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] |
802.1401 | Andrei Vieru | Andrei Vieru | About Stable Periodic Helixes, L-iteration and Chaos Generated by
Unbounded Functions | 11 pages | null | null | null | math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider stable periodic helixes as a generalization of stable periodic
orbits. We see that in the studied class of iterated functions Chaos always
arise suddenly. Therefore, we shall study the route from chaos to order rather
than the route from order to chaos. We show that, paradoxically, genuine Chaos
may look as much like Order and during as many iteration steps as one may wish.
Then, we shall propose a generalization of the idea of map iteration that do
not imply the existence of periodic orbits. We shall show that, within a
strictly deterministic context, unpredictability, aperiodic order, sensitive
dependence and chaos are completely different concepts and we shall try to show
what this difference is made of. We shall also propose an example of non
chaotic aperiodic order.
| [
{
"version": "v1",
"created": "Mon, 11 Feb 2008 09:59:40 GMT"
},
{
"version": "v2",
"created": "Sat, 31 May 2008 23:10:57 GMT"
}
] | 2008-06-01T00:00:00 | [
[
"Vieru",
"Andrei",
""
]
] | [
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802.1402 | Ezio Vasselli | J. E. Roberts, G. Ruzzi, E. Vasselli | Net bundles over posets and K-theory | 34 pages | null | null | null | math.KT math-ph math.AT math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue studying net bundles over partially ordered sets (posets),
defined as the analogues of ordinary fibre bundles. To this end, we analyze the
connection between homotopy, net homology and net cohomology of a poset, giving
versions of classical Hurewicz theorems. Focusing our attention on Hilbert net
bundles, we define the K-theory of a poset and introduce functions over the
homotopy groupoid satisfying the same formal properties as Chern classes. As
when the given poset is a base for the topology of a space, our results apply
to the category of locally constant bundles.
| [
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{
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"created": "Wed, 27 Jun 2012 07:37:40 GMT"
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Subsets and Splits