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802.1803 | Ayan Khan | Ayan Khan | Pair Formation in a t-J Model | M.Sc. Thesis. Supervised by Dr. Saurabh Basu, IIT Guwahati, India | null | null | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the formation of bound state of two electrons in
different kind of lattices using a t-J-U model.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 11:09:32 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Khan",
"Ayan",
""
]
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802.1804 | Nikos Karachalios I | Nikos I. Karachalios and Nikos B. Zographopoulos | The semiflow of a reaction diffusion equation with a singular potential | 20 pages, 3 figures | null | null | null | math.AP math.DS | null | We study the semiflow $\mathcal{S}(t)$ defined by a semilinear parabolic
equation with a singular square potential $V(x)=\frac{\mu}{|x|^2}$. It is known
that the Hardy-Poincar\'{e} inequality and its improved versions, have a
prominent role on the definition of the natural phase space. Our study concerns
the case $0<\mu\leq\mu^*$, where $\mu^*$ is the optimal constant for the
Hardy-Poincar\'{e} inequality. On a bounded domain of $\mathbb{R}^N$, we
justify the global bifurcation of nontrivial equilibrium solutions for a
reaction term $f(s)=\lambda s-|s|^{2\gamma}s$, with $\lambda$ as a bifurcation
parameter. The global bifurcation result is used to show that any solution
$\phi(t)=\mathcal{S}(t)\phi_0$, initiating form initial data $\phi_0\geq 0$
($\phi_0\leq 0$), $\phi_0\not\equiv 0$, tends to the unique nonnegative
(nonpositive) equilibrium.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:03:43 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Karachalios",
"Nikos I.",
""
],
[
"Zographopoulos",
"Nikos B.",
""
]
] | [
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802.1805 | Olga Holtz | Yury S. Barkovsky | Lectures on the Routh-Hurwitz problem | lecture notes; 43 pages, 6 figures; translated from the Russian by
Olga Holtz and Mikhail Tyaglov | null | null | null | math.CA math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The notes contain a streamlined account on stability of univariate
polynomials and related problems
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 20:33:54 GMT"
}
] | 2011-04-15T00:00:00 | [
[
"Barkovsky",
"Yury S.",
""
]
] | [
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] |
802.1806 | Vladimir Galkin | D. Ebert, R. N. Faustov, V. O. Galkin | Relativistic description of heavy tetraquarks | 6 pages, talk at the scientific session-conference of Nuclear Physics
Department RAS ``Physics of fundamental interactions'', 25-30 November 2007,
ITEP, Moscow | null | 10.1134/S1063778809010220 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The masses of the ground state and excited heavy tetraquarks with hidden
charm and bottom are calculated within the relativistic diquark-antidiquark
picture. The dynamics of the light quark in a heavy-light diquark is treated
completely relativistically. The diquark structure is taken into account by
calculating the diquark-gluon form factor. New experimental data on
charmonium-like states above the open charm threshold are discussed. The
obtained results indicate that X(3872), Y(4260), Y(4360), Z(4433) and Y(4660)
can be tetraquark states with hidden charm.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 11:33:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] | [
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802.1807 | Brian Street | Brian Street | An Algebra Containing the Two-Sided Convolution Operators | 69 pages | null | null | null | math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an intrinsically defined algebra of operators containing the right
and left invariant Calder\'on-Zygmund operators on a stratified group. The
operators in our algebra are pseudolocal and bounded on L^p (1<p<\infty). This
algebra provides an example of an algebra of singular integrals that falls
outside of the classical Calder\'on-Zygmund theory.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 11:57:22 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Street",
"Brian",
""
]
] | [
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] |
802.1808 | Ryuichi Takahashi | Ryuichi Takahashi, Naoki Yoshida, Takahiko Matsubara, Naoshi Sugiyama,
Issha Kayo, Takahiro Nishimichi, Akihito Shirata, Atsushi Taruya, Shun Saito,
Kazuhiro Yahata, and Yasushi Suto | Simulations of Baryon Acoustic Oscillations I: Growth of Large-Scale
Density Fluctuations | references added, minor changes | null | 10.1111/j.1365-2966.2008.13731.x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We critically examine how well the evolution of large-scale density
perturbations is followed in cosmological $N$-body simulations. We first run a
large volume simulation and perform a mode-by-mode analysis in
three-dimensional Fourier space. We show that the growth of large-scale
fluctuations significantly deviates from linear theory predictions. The
deviations are caused by {\it nonlinear} coupling with a small number of modes
at largest scales owing to finiteness of the simulation volume. We then develop
an analytic model based on second-order perturbation theory to quantify the
effect. Our model accurately reproduces the simulation results. For a single
realization, the second-order effect appears typically as ``zig-zag'' patterns
around the linear-theory prediction, which imprints artificial ``oscillations''
that lie on the real baryon-acoustic oscillations. Although an ensemble average
of a number of realizations approaches the linear theory prediction, the
dispersions of the realizations remain large even for a large simulation volume
of several hundred megaparsecs on a side. For the standard $\Lambda$CDM model,
the deviations from linear growth rate are as large as 10 percent for a
simulation volume with $L = 500h^{-1}$Mpc and for a bin width in wavenumber of
$\Delta k = 0.005h$Mpc$^{-1}$, which are comparable to the intrinsic variance
of Gaussian random realizations. We find that the dispersions scales as
$\propto L^{-3/2} \Delta k^{-1/2}$ and that the mean dispersion amplitude can
be made smaller than a percent only if we use a very large volume of $L >
2h^{-1}$Gpc. The finite box size effect needs to be appropriately taken into
account when interpreting results from large-scale structure simulations for
future dark energy surveys using baryon acoustic oscillations.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 12:04:06 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Jul 2008 14:17:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Takahashi",
"Ryuichi",
""
],
[
"Yoshida",
"Naoki",
""
],
[
"Matsubara",
"Takahiko",
""
],
[
"Sugiyama",
"Naoshi",
""
],
[
"Kayo",
"Issha",
""
],
[
"Nishimichi",
"Takahiro",
""
],
[
"Shirata",
"Akihito",
""
],
[
"Taruya",
"Atsushi",
""
],
[
"Saito",
"Shun",
""
],
[
"Yahata",
"Kazuhiro",
""
],
[
"Suto",
"Yasushi",
""
]
] | [
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] |
802.1809 | Robert A. Herrmann | Robert A. Herrmann | Modern Infinitesimal Analysis Applied to the Physical Metric dS and a
Theoretical Verification of a Time-dilation Conjecture | 20 pages | null | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the modern theory of infinitesimals is applied to the General
Relativity metric dS and its geometric and physical meanings are rigorously
investigated. Employing results obtained via the time-dependent Schrodinger
equation, gravitational time-dilation expressions are obtained and are shown to
be caused by gravitationally altered photon interactions with atomic
structures.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 12:04:38 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Herrmann",
"Robert A.",
""
]
] | [
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] |
802.181 | Isabelle Baraffe dr | I. Baraffe (ENS-Lyon), G. Chabrier (ENS-Lyon) and T. Barman (Lowell
Observatory) | Structure and evolution of super-Earth to super-Jupiter exoplanets: I.
heavy element enrichment in the interior | 20 pages, 12 figures. Accepted for publication in Astronomy and
Astrophysics | Astron.Astrophys.482:315-332,2008 | 10.1051/0004-6361:20079321 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the uncertainties in current planetary models and we quantify
their impact on the planet cooling histories and mass-radius relationships.
These uncertainties include (i) the differences between the various equations
of state used to characterize the heavy material thermodynamical properties,
(ii) the distribution of heavy elements within planetary interiors, (iii) their
chemical composition and (iv) their thermal contribution to the planet
evolution. Our models, which include a gaseous H/He envelope, are compared with
models of solid, gasless Earth-like planets in order to examine the impact of a
gaseous envelope on the cooling and the resulting radius. We find that for a
fraction of heavy material larger than 20% of the planet mass, the distribution
of the heavy elements in the planet's interior affects substantially the
evolution and thus the radius at a given age. For planets with large core mass
fractions ($\simgr$ 50%), such as the Neptune-mass transiting planet GJ436b,
the contribution of the gravitational and thermal energy from the core to the
planet cooling history is not negligible, yielding a $\sim$ 10% effect on the
radius after 1 Gyr. We show that the present mass and radius determinations of
the massive planet Hat-P-2b require at least 200 $\mearth$ of heavy material in
the interior, at the edge of what is currently predicted by the core-accretion
model for planet formation. We show that if planets as massive as $\sim$ 25
$\mjup$ can form, as predicted by improved core-accretion models, deuterium is
able to burn in the H/He layers above the core, even for core masses as large
as $\sim$ 100 $\mearth$. We provide extensive grids of planetary evolution
models from 10 $\mearth$ to 10 M$_{\rm Jup}$, with various fractions of heavy
elements.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 12:04:42 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Baraffe",
"I.",
"",
"ENS-Lyon"
],
[
"Chabrier",
"G.",
"",
"ENS-Lyon"
],
[
"Barman",
"T.",
"",
"Lowell\n Observatory"
]
] | [
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802.1811 | Aditi Sen De | Rafal Demkowicz-Dobrzanski, Aditi Sen De, Ujjwal Sen, Maciej
Lewenstein | Entanglement Enhances Security in Secret Sharing | 5 pages, 1 figure, RevTeX4 | Phys. Rev. A 80, 012311 (2009) | 10.1103/PhysRevA.80.012311 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze tolerable quantum bit error rates in secret sharing protocols, and
show that using entangled encoding states is advantageous in the case when the
eavesdropping attacks are local. We also provide a criterion for security in
secret sharing -- a parallel of the Csiszar-Korner criterion in single-receiver
cryptography.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 12:15:16 GMT"
}
] | 2009-10-20T00:00:00 | [
[
"Demkowicz-Dobrzanski",
"Rafal",
""
],
[
"De",
"Aditi Sen",
""
],
[
"Sen",
"Ujjwal",
""
],
[
"Lewenstein",
"Maciej",
""
]
] | [
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] |
802.1812 | Tewfik Kernane | Tewfik Kernane (USTHB) | Conditions for stability and instability of retrial queueing systems
with general retrial times | null | Statistics & Probability Letters (2008) STAPRO: 5118 | 10.1016/j.spl.2008.06.019 | null | math.PR | null | We study the stability of single server retrial queues under general
distribution for retrial times and stationary ergodic service times, for three
main retrial policies studied in the literature: classical linear, constant and
control policies. The approach used is the renovating events approach to obtain
sufficient stability conditions by strong coupling convergence of the process
modeling the dynamics of the system to a unique stationary ergodic regime. We
also obtain instability conditions by convergence in distribution to improper
limiting sequences.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 12:27:05 GMT"
}
] | 2008-08-07T00:00:00 | [
[
"Kernane",
"Tewfik",
"",
"USTHB"
]
] | [
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] |
802.1813 | M. Hossein Dehghani | S. H. Hendi and M. H. Dehghani | Taub-NUT Black Holes in Third order Lovelock Gravity | 10 pages | Phys.Lett.B666:116-120,2008 | 10.1016/j.physletb.2008.07.002 | null | hep-th | http://creativecommons.org/licenses/by/3.0/ | We consider the existence of Taub-NUT solutions in third order Lovelock
gravity with cosmological constant, and obtain the general form of these
solutions in eight dimensions. We find that, as in the case of Gauss-Bonnet
gravity and in contrast with the Taub-NUT solutions of Einstein gravity, the
metric function depends on the specific form of the base factors on which one
constructs the circle fibration. Thus, one may say that the independence of the
NUT solutions on the geometry of the base space is not a robust feature of all
generally covariant theories of gravity and is peculiar to Einstein gravity. We
find that when Einstein gravity admits non-extremal NUT solutions with no
curvature singularity at $r=N$, then there exists a non-extremal NUT solution
in third order Lovelock gravity. In 8-dimensional spacetime, this happens when
the metric of the base space is chosen to be $\Bbb{CP}^{3}$. Indeed, third
order Lovelock gravity does not admit non-extreme NUT solutions with any other
base space. This is another property which is peculiar to Einstein gravity. We
also find that the third order Lovelock gravity admits extremal NUT solution
when the base space is $T^{2}\times T^{2}\times T^{2}$ or $S^{2}\times
T^{2}\times T^{2}$. We have extended these observations to two conjectures
about the existence of NUT solutions in Lovelock gravity in any
even-dimensional spacetime.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 12:36:50 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Aug 2008 05:19:08 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Hendi",
"S. H.",
""
],
[
"Dehghani",
"M. H.",
""
]
] | [
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] |
802.1814 | Nils Wiese | C.W. Sandweg, N. Wiese, D. McGrouther, S.J. Hermsdoerfer, H.
Schultheiss, B. Leven, S. McVitie, B. Hillebrands, J.N. Chapman | Direct observation of domain wall structures in curved permalloy wires
containing an anti-notch | submitted for publication in J. Appl. Phys. (5 pages, 5 figure) | published in J. Appl. Phys. 103, 093906 (2008) | 10.1063/1.2913318 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The formation and field response of head-to-head domain walls in curved
permalloy wires, fabricated to contain a single anti-notch, have been
investigated using Lorentz microscopy. High spatial resolution maps of the
vector induction distribution in domain walls close to the anti-notch have been
derived and compared with micromagnetic simulations. In wires of 10 nm
thickness the walls are typically of a modified asymmetric transverse wall
type. Their response to applied fields tangential to the wire at the anti-notch
location was studied. The way the wall structure changes depends on whether the
field moves the wall away from or further into the notch. Higher fields are
needed and much more distorted wall structures are observed in the latter case,
indicating that the anti-notch acts as an energy barrier for the domain wall.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 12:58:05 GMT"
}
] | 2008-05-10T00:00:00 | [
[
"Sandweg",
"C. W.",
""
],
[
"Wiese",
"N.",
""
],
[
"McGrouther",
"D.",
""
],
[
"Hermsdoerfer",
"S. J.",
""
],
[
"Schultheiss",
"H.",
""
],
[
"Leven",
"B.",
""
],
[
"McVitie",
"S.",
""
],
[
"Hillebrands",
"B.",
""
],
[
"Chapman",
"J. N.",
""
]
] | [
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] |
802.1815 | Ding Yang | Yang Ding | A Construction for Constant-Composition Codes | 4 pages, submitted to IEEE Infromation Theory | null | 10.1109/TIT.2008.926380 | null | cs.IT math.IT | null | By employing the residue polynomials, a construction of constant-composition
codes is given. This construction generalizes the one proposed by Xing[16]. It
turns out that when d=3 this construction gives a lower bound of
constant-composition codes improving the one in [10]. Moreover, for d>3, we
give a lower bound on maximal size of constant-composition codes. In
particular, our bound for d=5 gives the best possible size of
constant-composition codes up to magnitude.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 12:59:04 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Ding",
"Yang",
""
]
] | [
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] |
802.1816 | Ronald de Wolf | Ronald de Wolf (CWI Amsterdam) | A note on quantum algorithms and the minimal degree of epsilon-error
polynomials for symmetric functions | 7 pages LaTeX. 2nd version: corrected a few small inaccuracies | null | null | null | quant-ph | null | The degrees of polynomials representing or approximating Boolean functions
are a prominent tool in various branches of complexity theory. Sherstov
recently characterized the minimal degree deg_{\eps}(f) among all polynomials
(over the reals) that approximate a symmetric function f:{0,1}^n-->{0,1} up to
worst-case error \eps: deg_{\eps}(f) = ~\Theta(deg_{1/3}(f) +
\sqrt{n\log(1/\eps)}). In this note we show how a tighter version (without the
log-factors hidden in the ~\Theta-notation), can be derived quite easily using
the close connection between polynomials and quantum algorithms.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:36:15 GMT"
},
{
"version": "v2",
"created": "Fri, 15 Feb 2008 16:47:22 GMT"
}
] | 2008-02-15T00:00:00 | [
[
"de Wolf",
"Ronald",
"",
"CWI Amsterdam"
]
] | [
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] |
802.1817 | Roberto Fusco-Femiano | Roberto Fusco-Femiano and Mauro Orlandini | Comments to the review "Nonthermal phenomena in clusters of galaxies" by
Y.Rephaeli et al. that will appear on the book: Clusters of galaxies: beyond
the thermal view | 3 pages | null | null | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Comments to the review "Nonthermal Phenomena in Clusters of Galaxies" by
Y.Rephaeli et al. (arXiv:0801.0982 [astro-ph]) that regard the presence of a
hard X-ray excess in the Coma cluster, A2199, A2163 and the Bullet cluster.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:03:04 GMT"
}
] | 2008-07-09T00:00:00 | [
[
"Fusco-Femiano",
"Roberto",
""
],
[
"Orlandini",
"Mauro",
""
]
] | [
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] |
802.1818 | Valentin Ovsienko | Valentin Ovsienko (ICJ) | Bi-Hamiltonian nature of the equation $u_{tx}=u_{xy} u_y-u_{yy} u_x$ | null | null | null | null | math-ph math.MP | null | We study non-linear integrable partial differential equations naturally
arising as bi-Hamiltonian Euler equations related to the looped cotangent
Virasoro algebra. This infinite-dimensional Lie algebra (constructed in
\cite{OR}) is a generalization of the classical Virasoro algebra to the case of
two space variables. Two main examples of integrable equations we obtain are
quite well known. We show that the relation between these two equations is
similar to that between the Korteweg-de Vries and Camassa-Holm equations.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:03:23 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Ovsienko",
"Valentin",
"",
"ICJ"
]
] | [
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] |
802.1819 | Masahiro Kojima | M. Kojima, J. Yamamoto, K. Sadakane and K. Yoshikawa | Generation of Multiple Circular Walls on a Thin Film of Nematic Liquid
Crystal by Laser Scanning | 10 pages, 5 figures. Submitted to Chemical Physics Letters 2nd
Edition | null | 10.1016/j.cplett.2008.03.063 | null | cond-mat.soft cond-mat.mtrl-sci | null | We found that multiple circular walls (MCW) can be generated on a thin film
of a nematic liquid crystal through a spiral scanning of a focused IR laser.
The ratios between radii of adjacent rings of MCW were almost constant. These
constant ratios can be explained theoretically by minimization of the Frank
elastic free energy of nematic medium. The director field on a MCW exhibits
chiral symmetry-breaking although the elastic free energies of both chiral MCWs
are degenerated, i.e., the director on a MCW can rotate clockwise or
counterclockwise along the radial direction.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:42:12 GMT"
},
{
"version": "v2",
"created": "Sun, 2 Mar 2008 04:46:46 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kojima",
"M.",
""
],
[
"Yamamoto",
"J.",
""
],
[
"Sadakane",
"K.",
""
],
[
"Yoshikawa",
"K.",
""
]
] | [
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] |
802.182 | Michael Schreiber | Michael Schreiber | An empirical investigation of the g-index for 26 physicists in
comparison with the h-index, the A-index, and the R-index | 28 pages, including 4 figures with 6 plots, 4 tables accepted for
publication in J. Am. Soc. Inf. Sci. Techn | J. Am. Soc. Inf. Sci. Techn. 59, 1513-1522 (2008) | null | null | physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hirsch has introduced the h-index to quantify an individual's scientific
research output by the largest number h of a scientist's papers that received
at least h citations. In order to take into account the highly skewed frequency
distribution of citations, Egghe proposed the g-index as an improvement of the
h-index. I have worked out 26 practical cases of physicists from the Institute
of Physics at Chemnitz University of Technology and compare the h and g values.
It is demonstrated that the g-index discriminates better between different
citation patterns. This can also be achieved by evaluating Jin's A-index which
reflects the average number of citations in the h-core and interpreting it in
conjunction with the h-index. h and A can be combined into the R-index to
measure the h-core's citation intensity. I have also determined the A and R
values for the 26 data sets. For a better comparison, I utilize interpolated
indices. The correlations between the various indices as well as with the total
number of papers and the highest citation counts are discussed. The largest
Pearson correlation coefficient is found between g and R. Although the
correlation between g and h is relatively strong, the arrangement of the data
set is significantly different, depending on whether they are put into order
according to the values of either h or g.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:05:15 GMT"
}
] | 2013-01-31T00:00:00 | [
[
"Schreiber",
"Michael",
""
]
] | [
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802.1821 | Trippenbach | M. Trippenbach, E. Infeld, J. Gocalek, Michal Matuszewski, M.
Oberthaler, and B. A. Malomed | Spontaneous symmetry breaking of gap solitons in double-well traps | 6 pages, 5 figures | null | 10.1103/PhysRevA.78.013603 | null | cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a two dimensional model for the Bose-Einstein condensate with
both attractive and repulsive nonlinearities. We assume a combination of a
double well potential in one direction, and an optical lattice along the
perpendicular coordinate. We look for dual core solitons in this model,
focusing on their symmetry-breaking bifurcations. The analysis employs a
variational approximation, which is verified by numerical results. The
bifurcation which transforms antisymmetric gap solitons into asymmetric ones is
of supercritical type in the case of repulsion; in the attraction model,
increase of the optical latttice strength leads to a gradual transition from
subcritical bifurcation (for symmetric solitons) to a supercritical one.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:10:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Trippenbach",
"M.",
""
],
[
"Infeld",
"E.",
""
],
[
"Gocalek",
"J.",
""
],
[
"Matuszewski",
"Michal",
""
],
[
"Oberthaler",
"M.",
""
],
[
"Malomed",
"B. A.",
""
]
] | [
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] |
802.1822 | Michele Grassi | Giovanni Gaiffi, Michele Grassi | Natural Lie Algebra bundles on rank two s-K\"ahler manifolds, abelian
varieties and moduli of curves | in v2 a new theorem in Section 8 has been added | null | null | null | math.AG math.DG | null | We prove that one can obtain natural bundles of Lie algebras on rank two
s-K\"ahler manifolds, whose fibres are isomorphic to so(s+1,s+1), su(s+1,s+1)
and sl(2s + 2,\R). In the most rigid case (which includes complex tori and
abelian varieties) these bundles have natural flat connections, whose flat
global sections act naturally on cohomology. We also present several natural
examples of manifolds which can be equipped with an s-K\"ahler structure with
various levels of rigidity: complex tori and abelian varieties, cotangent
bundles of smooth manifolds and moduli of pointed elliptic curves.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:20:01 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 11:44:35 GMT"
}
] | 2008-02-21T00:00:00 | [
[
"Gaiffi",
"Giovanni",
""
],
[
"Grassi",
"Michele",
""
]
] | [
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] |
802.1823 | Martin Keller-Ressel | Martin Keller-Ressel | Moment Explosions and Long-Term Behavior of Affine Stochastic Volatility
Models | minor revision | null | null | null | q-fin.PR math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of asset pricing models, where the risk-neutral joint
process of log-price and its stochastic variance is an affine process in the
sense of Duffie, Filipovic and Schachermayer [2003]. First we obtain conditions
for the price process to be conservative and a martingale. Then we present some
results on the long-term behavior of the model, including an expression for the
invariant distribution of the stochastic variance process. We study moment
explosions of the price process, and provide explicit expressions for the time
at which a moment of given order becomes infinite. We discuss applications of
these results, in particular to the asymptotics of the implied volatility
smile, and conclude with some calculations for the Heston model, a model of
Bates and the Barndorff-Nielsen-Shephard model.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:34:37 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Oct 2008 08:38:59 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Keller-Ressel",
"Martin",
""
]
] | [
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] |
802.1824 | Harinder Singh | Partha S. Pal, Harinder P. Singh, Kwing L. Chan, M. P. Srivastava | Turbulent Compressible Convection with Rotation - Penetration above a
Convection Zone | Accepted for Publication in Asttrophysics & Space Science | Astrophys.Space Sci.314:231-239,2008 | 10.1007/s10509-008-9764-0 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform Large eddy simulations of turbulent compressible convection in
stellar-type convection zones by solving the Navi\'{e}r-Stokes equations in
three dimensions. We estimate the extent of penetration into the stable layer
above a stellar-type convection zone by varying the rotation rate
({\boldmath$\rm\Omega$}), the inclination of the rotation vector ($\theta$) and
the relative stability ($S$) of the upper stable layer. The computational
domain is a rectangular box in an f-plane configuration and is divided into two
regions of unstable and stable stratification with the stable layer placed
above the convectively unstable layer. Several models have been computed and
the penetration distance into the stable layer above the convection zone is
estimated by determining the position where time averaged kinetic energy flux
has the first zero in the upper stable layer. The vertical grid spacing in all
the model is non-uniform, and is less in the upper region so that the flows are
better resolved in the region of interest. We find that the penetration
distance increases as the rotation rate increases for the case when the
rotation vector is aligned with the vertical axis. However, with the increase
in the stability of the upper stable layer, the upward penetration distance
decreases. Since we are not able to afford computations with finer resolution
for all the models, we compute a number of models to see the effect of
increased resolution on the upward penetration. In addition, we estimate the
upper limit on the upward convective penetration from stellar convective cores.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:32:43 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Pal",
"Partha S.",
""
],
[
"Singh",
"Harinder P.",
""
],
[
"Chan",
"Kwing L.",
""
],
[
"Srivastava",
"M. P.",
""
]
] | [
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] |
802.1825 | Carlos L\'opez C. E. L\'opez | C.E. Lopez, G. Romero, F. Lastra, E. Solano, and J. C. Retamal | Sudden Birth Versus Sudden Death of Entanglement in Multipartite Systems | 5 pages, 5 figures, accepted for publication in Physical Review
Letters | Phys. Rev. Lett. 101, 080503 (2008) | 10.1103/PhysRevLett.101.080503 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the entanglement dynamics of two cavities interacting with
independent reservoirs. Expectedly, we observe that, as the cavity entanglement
is depleted, it is transferred to the reservoir degrees of freedom. We find
that when the cavity entanglement suddenly disappear, the reservoir
entanglement suddenly and necessarily appears. Surprisingly, we show that this
{\it entanglement sudden birth} can manifest before, simultaneously, or even
after {\it entanglement sudden death}. Finally, we present an explanatory study
of other entanglement partitions and of higher dimensional systems.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:34:54 GMT"
},
{
"version": "v2",
"created": "Tue, 19 Feb 2008 23:08:05 GMT"
},
{
"version": "v3",
"created": "Mon, 3 Mar 2008 13:13:17 GMT"
},
{
"version": "v4",
"created": "Wed, 23 Jul 2008 15:39:50 GMT"
}
] | 2008-09-11T00:00:00 | [
[
"Lopez",
"C. E.",
""
],
[
"Romero",
"G.",
""
],
[
"Lastra",
"F.",
""
],
[
"Solano",
"E.",
""
],
[
"Retamal",
"J. C.",
""
]
] | [
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] |
802.1826 | Marc Wouts | Jean Ruiz (CPT), Marc Wouts (MODAL'x) | On the Kert\'esz line: Some rigorous bounds | 11 pages, 1 figure | Journal of Mathematical Physics 49 (2008) 053303 | 10.1063/1.2924322 | null | cond-mat.stat-mech math-ph math.MP math.PR | null | We study the Kert\'esz line of the $q$--state Potts model at (inverse)
temperature $\beta$, in presence of an external magnetic field $h$. This line
separates two regions of the phase diagram according to the existence or not of
an infinite cluster in the Fortuin-Kasteleyn representation of the model. It is
known that the Kert\'esz line $h_K (\beta)$ coincides with the line of first
order phase transition for small fields when $q$ is large enough. Here we prove
that the first order phase transition implies a jump in the density of the
infinite cluster, hence the Kert\'esz line remains below the line of first
order phase transition. We also analyze the region of large fields and prove,
using techniques of stochastic comparisons, that $h_K (\beta)$ equals $\log (q
- 1) - \log (\beta - \beta_p)$ to the leading order, as $\beta$ goes to
$\beta_p = - \log (1 - p_c)$ where $p_c$ is the threshold for bond percolation.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:36:37 GMT"
}
] | 2008-05-19T00:00:00 | [
[
"Ruiz",
"Jean",
"",
"CPT"
],
[
"Wouts",
"Marc",
"",
"MODAL'x"
]
] | [
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] |
802.1827 | Ulrike K\"ohler | U. K\"ohler, N. Oeschler, F. Steglich, S. Maquilon, and Z. Fisk | Energy scales of Lu(1-x)Yb(x)Rh2Si2 by means of thermopower
investigations | 15 pages, 4 figures, accepted in Phys. Rev. B | Phys. Rev. B 77, 104412 (2008) | 10.1103/PhysRevB.77.104412 | null | cond-mat.str-el | null | We present the thermopower S(T) and the resistivity rho(T) of
Lu(1-x)Yb(x)Rh2Si2 in the temperature range 3 K < T < 300 K. S(T) is found to
change from two minima for dilute systems (x < 0.5) to a single large minimum
in pure YbRh2Si2. A similar behavior has also been found for the magnetic
contribution to the resistivity rho_mag(T). The appearance of the low-T extrema
in S(T) and rho_mag(T) is attributed to the lowering of the Kondo scale with
decreasing x. The evolution of the characteristic energy scales for both the
Kondo effect and the crystal electric field splitting are deduced. An
extrapolation allows to estimate the Kondo temperature of YbRh2Si2 to 29 K.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:11:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Köhler",
"U.",
""
],
[
"Oeschler",
"N.",
""
],
[
"Steglich",
"F.",
""
],
[
"Maquilon",
"S.",
""
],
[
"Fisk",
"Z.",
""
]
] | [
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] |
802.1828 | Gerd Czycholl | Claudia Schneider, Gerd Czycholl | Weak-coupling Treatment of Electronic (Anti-)Ferroelectricity in the
Extended Falicov-Kimball Model | 7 pages, 8 figures | null | 10.1140/epjb/e2008-00273-y | null | cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the (spinless) Falicov-Kimball model extended by a finite band width
(hopping $t_f$) of the localized (f-) electrons in infinite dimensions in the
weak-coupling limit of a small local interband Coulomb correlation $U$ for half
filling. In the case of overlapping conduction- and f-bands different kinds of
ordered solutions are possible, namely charge-density wave (CDW) order,
electronic ferroelectricity (EFE) and electronic antiferroelectricity (EAFE).
The order parameters are calculated as a function of the model parameters and
of the temperature. There is a first-order phase transition from the CDW-phase
to the EFE- or EAFE-phase. The total energy is calculated to determine the
thermodynamically stable solution. The quantum phase diagrams are calculated.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:40:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schneider",
"Claudia",
""
],
[
"Czycholl",
"Gerd",
""
]
] | [
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] |
802.1829 | Francesco Zamponi | Fabrizio Altarelli, Remi Monasson, Guilhem Semerjian and Francesco
Zamponi | A review of the Statistical Mechanics approach to Random Optimization
Problems | 26 pages, 8 figures. Contribution to the book "Handbook of
Satisfiability" to be published in 2008 by IOS press | In "Handbook of Satisfiability", published by IOS press (2009),
Volume 185 of the Series "Frontiers in Artificial Intelligence and
Applications" | null | null | cs.CC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the connection between statistical mechanics and the analysis of
random optimization problems, with particular emphasis on the random k-SAT
problem. We discuss and characterize the different phase transitions that are
met in these problems, starting from basic concepts. We also discuss how
statistical mechanics methods can be used to investigate the behavior of local
search and decimation based algorithms.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 13:45:16 GMT"
}
] | 2009-01-08T00:00:00 | [
[
"Altarelli",
"Fabrizio",
""
],
[
"Monasson",
"Remi",
""
],
[
"Semerjian",
"Guilhem",
""
],
[
"Zamponi",
"Francesco",
""
]
] | [
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] |
802.183 | Joaquim Prades | Jose Bernabeu (Valencia) and Joaquim Prades (Granada) | The sigma -> gamma gamma Width from Nucleon Electromagnetic
Polarizabilities | 9 pages, 1 figure. v2: Matches published version. v3: Small errata in
Eq. (3) corrected | Phys.Rev.Lett.100:241804,2008 | 10.1103/PhysRevLett.100.241804 | CAFPE-92/08, FTUV-08-0130, UG-FT-222/08 | hep-ph | null | The lightest QCD resonance, the sigma, has been recently fixed in the pi-pi
scattering amplitude.
The nature of this state remains nowadays one of the most intriguing and
difficult issues in particle physics. Its coupling to photons is crucial to
discriminate its structure. We propose a new method that fixes this coupling
using only available precise experimental data on the proton electromagnetic
polarizabilities together with analyticity and unitarity. Taking into account
the uncertainties in the analysis and in the parameter values, our result is
Gamma_{pole}(sigma -> gamma gamma) = (1.2 +- 0.4) KeV.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 14:20:50 GMT"
},
{
"version": "v2",
"created": "Mon, 26 May 2008 13:12:37 GMT"
},
{
"version": "v3",
"created": "Wed, 28 May 2008 17:38:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bernabeu",
"Jose",
"",
"Valencia"
],
[
"Prades",
"Joaquim",
"",
"Granada"
]
] | [
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] |
802.1831 | Stefan Gerhold | Stefan Gerhold | The Longstaff--Schwartz algorithm for L\'{e}vy models: Results on fast
and slow convergence | Published in at http://dx.doi.org/10.1214/10-AAP704 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2011, Vol. 21, No. 2, 589-608 | 10.1214/10-AAP704 | IMS-AAP-AAP704 | math.PR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Longstaff--Schwartz algorithm for American option pricing
assuming that both the number of regressors and the number of Monte Carlo paths
tend to infinity. Our main results concern extensions, respectively,
applications of results by Glasserman and Yu [Ann. Appl. Probab. 14 (2004)
2090--2119] and Stentoft [Manag. Sci. 50 (2004) 1193--1203] to several L\'{e}vy
models, in particular the geometric Meixner model. A convenient setting to
analyze this convergence problem is provided by the L\'{e}vy--Sheffer systems
introduced by Schoutens and Teugels.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 14:45:06 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Apr 2011 12:46:30 GMT"
}
] | 2011-04-07T00:00:00 | [
[
"Gerhold",
"Stefan",
""
]
] | [
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802.1832 | Dominik Paszun | D. Paszun, C. Dominik | Numerical determination of the material properties of porous dust cakes | Accepted for publication in A&A | null | 10.1051/0004-6361:20079262 | null | astro-ph | null | The formation of planetesimals requires the growth of dust particles through
collisions. Micron-sized particles must grow by many orders of magnitude in
mass. In order to understand and model the processes during this growth, the
mechanical properties, and the interaction cross sections of aggregates with
surrounding gas must be well understood. Recent advances in experimental
(laboratory) studies now provide the background for pushing numerical aggregate
models onto a new level. We present the calibration of a previously tested
model of aggregate dynamics. We use plastic deformation of surface asperities
as the physical model to bring critical velocities for sticking into accordance
with experimental results. The modified code is then used to compute
compression strength and the velocity of sound in the aggregate at different
densities. We compare these predictions with experimental results and conclude
that the new code is capable of studying the properties of small aggregates.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 14:21:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Paszun",
"D.",
""
],
[
"Dominik",
"C.",
""
]
] | [
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] |
802.1833 | Lawrence Breen | Lawrence Breen | Differential Geometry of Gerbes and Differential Forms | To appear in the Proceedings of the workshop on Higher Structures in
Geometry and Physics (Paris, January 2007) | null | null | null | math.CT hep-th math.AG math.DG | null | We discuss certain aspects of the combinatorial approach to the differential
geometry of non-abelian gerbes, due to W. Messing and the author
(arXiv:math.AG/0106083), and give a more direct derivation of the associated
cocycle equations. This leads us to a more restrictive definition of the
corresponding coboundary relations. We also show that the diagrammatic proofs
of certain local curving and curvature equations may be replaced by
computations with differential forms.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 14:49:45 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Breen",
"Lawrence",
""
]
] | [
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] |
802.1834 | Lisheng Geng | L. S. Geng, J. Martin Camalich, L. Alvarez-Ruso, and M. J. Vicente
Vacas | Chiral perturbation theory study of the axial $N\to\Delta(1232)$
transition | 4 pages | Mod.Phys.Lett.A23:2246-2249,2008 | 10.1142/S0217732308029125 | null | hep-ph | null | We have performed a theoretical study of the axial Nucleon to Delta(1232)
($N\to\Delta$) transition form factors up to one-loop order in covariant baryon
chiral perturbation theory within a formalism in which the unphysical spin-1/2
components of the $\Delta$ fields are decoupled.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 14:28:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Geng",
"L. S.",
""
],
[
"Camalich",
"J. Martin",
""
],
[
"Alvarez-Ruso",
"L.",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] | [
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] |
802.1835 | Elio Conte | Elio Conte, Andrei Yuri Khrennikov, Orlando Todarello, Antonio
Federici, Joseph P. Zbilut | A Conclusive Experimentation Evidences that Mental States Follow Quantum
Mechanics. Further Experimentation Indicates that in Mind States Bell
Inequality Violation is Possible | null | NeuroQuantol.3:226,2008 | null | null | physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the first part of the paper we reach an experimental final confirmation
that mental states follow quantum mechanics. In the second part further
experimentation indicates that in mind states Bell inequality violation is
possible.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 14:27:11 GMT"
},
{
"version": "v2",
"created": "Fri, 22 Feb 2008 19:48:49 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Apr 2008 02:17:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Conte",
"Elio",
""
],
[
"Khrennikov",
"Andrei Yuri",
""
],
[
"Todarello",
"Orlando",
""
],
[
"Federici",
"Antonio",
""
],
[
"Zbilut",
"Joseph P.",
""
]
] | [
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] |
802.1836 | Enric Palle | E. Palle, Eric B. Ford, S. Seager, P. Montanes-Rodriguez, M. Vazquez | Identifying the rotation rate and the presence of dynamic weather on
extrasolar Earth-like planets from photometric observations | null | null | 10.1086/528677 | null | astro-ph | null | With the recent discoveries of hundreds of extrasolar planets, the search for
planets like Earth and life in the universe, is quickly gaining momentum. In
the future, large space observatories could directly detect the light scattered
from rocky planets, but they would not be able to spatially resolve a planet's
surface. Using reflectance models and real cloud data from satellite
observations, here we show that, despite Earth's dynamic weather patterns, the
light scattered by the Earth to a hypothetical distant observer as a function
of time contains sufficient information to accurately measure Earth's rotation
period. This is because ocean currents and continents result in relatively
stable averaged global cloud patterns. The accuracy of these measurements will
vary with the viewing geometry and other observational constraints. If the
rotation period can be measured with accuracy, data spanning several months
could be coherently combined to obtain spectroscopic information about
individual regions of the planetary surface. Moreover, deviations from a
periodic signal can be used to infer the presence of relatively short-live
structures in its atmosphere (i.e., clouds). This could provide a useful
technique for recognizing exoplanets that have active weather systems, changing
on a timescale comparable to their rotation. Such variability is likely to be
related to the atmospheric temperature and pressure being near a phase
transition and could support the possibility of liquid water on the planet's
surface.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 14:46:07 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 15:04:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Palle",
"E.",
""
],
[
"Ford",
"Eric B.",
""
],
[
"Seager",
"S.",
""
],
[
"Montanes-Rodriguez",
"P.",
""
],
[
"Vazquez",
"M.",
""
]
] | [
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] |
802.1837 | Sanju Velani | Victor Beresnevich and Sanju Velani | An Inhomogeneous Transference Principle and Diophantine Approximation | 37 pages: a final section on further developments has been added | null | 10.1112/plms/pdq002 | null | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a landmark paper, D.Y. Kleinbock and G.A. Margulis established the
fundamental Baker-Sprindzuk conjecture on homogeneous Diophantine approximation
on manifolds. Subsequently, there has been dramatic progress in this area of
research. However, the techniques developed to date do not seem to be
applicable to inhomogeneous approximation. Consequently, the theory of
inhomogeneous Diophantine approximation on manifolds remains essentially
non-existent.
In this paper we develop an approach that enables us to transfer homogeneous
statements to inhomogeneous ones. This is rather surprising as the
inhomogeneous theory contains the homogeneous theory and so is more general. As
a consequence, we establish the inhomogeneous analogue of the Baker-Sprindzuk
conjecture. Furthermore, we prove a complete inhomogeneous version of the
profound theorem of Kleinbock, Lindenstrauss & Weiss on the extremality of
friendly measures. The results obtained in this paper constitute the first step
towards developing a coherent inhomogeneous theory for manifolds in line with
the homogeneous theory.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 14:40:49 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Feb 2008 11:33:50 GMT"
}
] | 2014-02-26T00:00:00 | [
[
"Beresnevich",
"Victor",
""
],
[
"Velani",
"Sanju",
""
]
] | [
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] |
802.1838 | Christian Marinoni | C. Marinoni, L. Guzzo, A. Cappi, O. Le Fevre, A. Mazure, B. Meneux, A.
Pollo, the VVDS team | The VIMOS VLT Deep Survey: Testing the gravitational instability
paradigm at z ~ 1 | 14 pages, 5 figures, A&A in Press | null | 10.1051/0004-6361:20078891 | null | astro-ph | null | We have reconstructed the three-dimensional density fluctuation maps to z ~
1.5 using the distribution of galaxies observed in the VVDS-Deep survey. We use
this overdensity field to measure the evolution of the probability distribution
function and its lower-order moments over the redshift interval 0.7<z<1.5. We
apply a self-consistent reconstruction scheme which includes a complete
non-linear description of galaxy biasing and which has been throughly tested on
realistic mock samples. We find that the variance and skewness of the galaxy
distribution evolve over this redshift interval in a way that is remarkably
consistent with predictions of first- and second-order perturbation theory.
This finding confirms the standard gravitational instability paradigm over
nearly 9 Gyrs of cosmic time and demonstrates the importance of accounting for
the non-linear component of galaxy biasing to consistently reproduce the
higher-order moments of the galaxy distribution and their evolution.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:58:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Marinoni",
"C.",
""
],
[
"Guzzo",
"L.",
""
],
[
"Cappi",
"A.",
""
],
[
"Fevre",
"O. Le",
""
],
[
"Mazure",
"A.",
""
],
[
"Meneux",
"B.",
""
],
[
"Pollo",
"A.",
""
],
[
"team",
"the VVDS",
""
]
] | [
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] |
802.1839 | Sergio Ciliberto | Sylvain Joubaud (Phys-ENS), Artem Petrosyan (Phys-ENS), Sergio
Ciliberto (Phys-ENS), Nicolas Garnier (Phys-ENS) | Experimental evidence of non-Gaussian fluctuations near a critical point | submitted to PRL | Europhysics Letters (EPL) 5, 81 (2008) 50005 | 10.1209/0295-5075/81/50005 | null | cond-mat.stat-mech cond-mat.soft | null | The orientation fluctuations of the director of a liquid crystal are
measured, by a sensitive polarization interferometer, close to the
Fr\'eedericksz transition, which is a second order transition driven by an
electric field. We show that near the critical value of the field the spatially
averaged order parameter has a generalized Gumbel distribution instead of a
Gaussian one. The latter is recovered away from the critical point. The
relevance of slow modes is pointed out. The parameter of generalized Gumbel is
related to the effective number of degrees of freedom.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:02:34 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Apr 2008 15:52:59 GMT"
}
] | 2010-09-15T00:00:00 | [
[
"Joubaud",
"Sylvain",
"",
"Phys-ENS"
],
[
"Petrosyan",
"Artem",
"",
"Phys-ENS"
],
[
"Ciliberto",
"Sergio",
"",
"Phys-ENS"
],
[
"Garnier",
"Nicolas",
"",
"Phys-ENS"
]
] | [
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] |
802.184 | Jose Roberto Campanha | Hari M. Gupta, Jose R. Campanha, Sidney J. Schinaider | Size limiting in Tsallis statistics | 22 pages, 8 figures | null | 10.1016/j.physa.2008.09.009 | null | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Power law scaling is observed in many physical, biological and
socio-economical complex systems and is now considered as an important property
of these systems. In general, power law exists in the central part of the
distribution. It has deviations from power law for very small and very large
step sizes. Tsallis, through non-extensive thermodynamics, explained power law
distribution in many cases including deviation from the power law, both for
small and very large steps. In case of very large steps, they used heuristic
crossover approach. In real systems, the size is limited and thus, the size
limiting factor is important. In the present work, we present an alternative
model in which we consider that the entropy factor q decreases with step size
due to the softening of long range interactions or memory. This explains the
deviation of power law for very large step sizes. Finally, we apply this model
for distribution of citation index of scientists and examination scores and are
able to explain the entire distribution including deviations from power law.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:05:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gupta",
"Hari M.",
""
],
[
"Campanha",
"Jose R.",
""
],
[
"Schinaider",
"Sidney J.",
""
]
] | [
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] |
802.1841 | Alex Hayat | Alex Hayat, Pavel Ginzburg and Meir Orenstein | Infrared Single-Photon Detector based on Silicon Two-Photon Absorption | To appear in Physical Review B http://prb.aps.org/ | null | null | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a scheme for infrared single-photon detection based on two-photon
absorption at room-temperature in Si avalanche photodiodes, where the detected
photon's energy is lower than the bandgap and the energy difference is
complemented by a pump field. A quantum non-perturbative model is developed for
non-degenerate two-photon absorption in direct and indirect semiconductors
yielding proper non-divergent rates allowing device efficiency optimization.
The proposed monolithic detector is simple, miniature, integrable and does not
require phase matching, while not compromising the performance and exhibiting
even better efficiency than the competing up-conversion schemes (~1 order of
magnitude) for similar optical pump levels.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:14:16 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Hayat",
"Alex",
""
],
[
"Ginzburg",
"Pavel",
""
],
[
"Orenstein",
"Meir",
""
]
] | [
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] |
802.1842 | Aashish Clerk | A. A. Clerk, F. Marquardt, K. Jacobs | Back-action evasion and squeezing of a mechanical resonator using a
cavity detector | 11 pages, 3 figures | New J. Phys. 10, 095010 (2008) (Focus Issue) | 10.1088/1367-2630/10/9/095010 | null | cond-mat.mes-hall quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum measurement of a cantilever using a
parametrically-coupled electromagnetic cavity which is driven at the two
sidebands corresponding to the mechanical motion. This scheme, originally due
to Braginsky et al. [V. Braginsky, Y. I. Vorontsov, and K. P. Thorne, Science
209, 547 (1980)], allows a back-action free measurement of one quadrature of
the cantilever's motion, and hence the possibility of generating a squeezed
state. We present a complete quantum theory of this system, and derive simple
conditions on when the quantum limit on the added noise can be surpassed. We
also study the conditional dynamics of the measurement, and discuss how such a
scheme (when coupled with feedback) can be used to generate and detect squeezed
states of the oscillator. Our results are relevant to experiments in
optomechanics, and to experiments in quantum electromechanics employing
stripline resonators coupled to mechanical resonators.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:16:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Clerk",
"A. A.",
""
],
[
"Marquardt",
"F.",
""
],
[
"Jacobs",
"K.",
""
]
] | [
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] |
802.1843 | Michael Zaiser | M. Zaiser, J. Schwerdtfeger, A.S. Schneider, C.P. Frick, B.G. Clark,
P.A. Gruber, E. Arzt | Strain bursts in plastically deforming Molybdenum micro- and nanopillars | 14 pages, 8 figures, submitted to Phil Mag | null | 10.1080/14786430802132522 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Plastic deformation of micron and sub-micron scale specimens is characterized
by intermittent sequences of large strain bursts (dislocation avalanches) which
are separated by regions of near-elastic loading. In the present investigation
we perform a statistical characterization of strain bursts observed in
stress-controlled compressive deformation of monocrystalline Molybdenum
micropillars. We characterize the bursts in terms of the associated elongation
increments and peak deformation rates, and demonstrate that these quantities
follow power-law distributions that do not depend on specimen orientation or
stress rate. We also investigate the statistics of stress increments in between
the bursts, which are found to be Weibull distributed and exhibit a
characteristic size effect. We discuss our findings in view of observations of
deformation bursts in other materials, such as face-centered cubic and
hexagonal metals.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:18:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zaiser",
"M.",
""
],
[
"Schwerdtfeger",
"J.",
""
],
[
"Schneider",
"A. S.",
""
],
[
"Frick",
"C. P.",
""
],
[
"Clark",
"B. G.",
""
],
[
"Gruber",
"P. A.",
""
],
[
"Arzt",
"E.",
""
]
] | [
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] |
802.1844 | Pomponio Alessio | Antonio Azzollini, Alessio Pomponio | On the Schrodinger equation in $R^N$ under the effect of a general
nonlinear term | 18 pages | null | null | null | math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we prove the existence of a positive solution to the equation
$-\Delta u + V(x)u=g(u)$ in $R^N,$ assuming the general hypotheses on the
nonlinearity introduced by Berestycki & Lions. Moreover we show that a
minimizing problem, related to the existence of a ground state, has no
solution.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:25:15 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Azzollini",
"Antonio",
""
],
[
"Pomponio",
"Alessio",
""
]
] | [
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] |
802.1845 | Alexei Larionov | A.B. Larionov, I.N. Mishustin, L.M. Satarov, and W. Greiner | Dynamical simulation of bound antiproton-nuclear systems and observable
signals of cold nuclear compression | 26 pages, 2 tables, 12 figures; extended discussion, added
references, new Fig. 4; version accepted in Phys. Rev. C | Phys.Rev.C78:014604,2008 | 10.1103/PhysRevC.78.014604 | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of the kinetic equation with selfconsistent relativistic mean
fields acting on baryons and antibaryons, we study dynamical response of the
nucleus to an antiproton implanted in its interior. By solving numerically the
time-dependent Vlasov equation, we show that the compressed state is formed on
a rather short time scale of about 4-10 fm/c. This justifies the assumption,
that the antiproton annihilation may happen in the compressed nuclear
environment. The evolution of the nucleus after antiproton annihilation is
described by the same kinetic equation including collision terms. We show, that
nucleon kinetic energy spectra and the total invariant mass distributions of
produced mesons are quite sensitive observables to the antiproton annihilation
in the compressed nucleus.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:53:04 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Jun 2008 13:01:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Larionov",
"A. B.",
""
],
[
"Mishustin",
"I. N.",
""
],
[
"Satarov",
"L. M.",
""
],
[
"Greiner",
"W.",
""
]
] | [
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] |
802.1846 | Vicent J. Martinez | Rodney M. Smith, Vicent J. Martinez, Alberto Fernandez-Soto, Fernando
J. Ballesteros and Amelia Ortiz-Gil | NGC1600 - Cluster or Field Elliptical? | 8 pages, 5 figures and 2 table, accepted for publication in the ApJ | null | 10.1086/587454 | null | astro-ph | null | A study of the galaxy distribution in the field of the elliptical galaxy
NGC1600 has been undertaken. Although this galaxy is often classified as a
member of a loose group, all the neighbouring galaxies are much fainter and
could be taken as satellites of NGC1600. The number density profile of galaxies
in the field of this galaxy shows a decline with radius, with evidence of a
background at approximately 1.3 Mpc. The density and number density profile are
consistent with that found for other isolated early-type galaxies. NGC1600
appears as an extended source in X-rays, and the center of the X-ray emission
seems not to coincide with the center of the galaxy. The velocity distribution
of neighbouring galaxies has been measured from optical spectroscopic
observations and shows that the mean radial velocity is approximately 85 km/s
less than that of NGC1600, indicating that the centre of mass could lie outside
the galaxy. The velocity dispersion of the `group' is estimated at 429 km/s.
The inferred mass of the system is therefore of the order of 10^14 solar
masses, a value that corresponds to a large group. NGC1600 therefore shares
some similarities, but is not identical to, the `fossil clusters' detected in
X-ray surveys. Implications of this result for studies of isolated early-type
galaxies are briefly discussed.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:47:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Smith",
"Rodney M.",
""
],
[
"Martinez",
"Vicent J.",
""
],
[
"Fernandez-Soto",
"Alberto",
""
],
[
"Ballesteros",
"Fernando J.",
""
],
[
"Ortiz-Gil",
"Amelia",
""
]
] | [
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] |
802.1847 | Edoardo Colavitti | Edoardo Colavitti, Francesca Matteucci and Giuseppe Murante | The chemical evolution of a Milky Way-like galaxy: the importance of a
cosmologically motivated infall law | This paper has 26 pages, 19 figures and 5 tables | null | 10.1051/0004-6361:200809413 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We aim at finding a cosmologically motivated infall law to understand if the
LambdaCDM cosmology can reproduce the main chemical characteristics of a Milky
Way-like spiral galaxy. In this work we test several different gas infall laws,
starting from that suggested in the two-infall model for the chemical evolution
of the Milky Way by Chiappini et al., but focusing on laws derived from
cosmological simulations which follows a concordance LambdaCDM cosmology. By
means of a detailed chemical evolution model for the solar vicinity, we study
the effects of the different gas infall laws on the abundance patterns and the
G-dwarf metallicity distribution. The cosmological gas infall law predicts two
main gas accretion episodes. By means of this cosmologically motivated infall
law, we study the star formation rate, the SNIa and SNII rate, the total amount
of gas and stars in the solar neighbourhood and the behaviour of several
chemical abundances. We find that the results of the two-infall model are fully
compatible with the evolution of the Milky Way with cosmological accretion
laws. A gas assembly history derived from a DM halo, compatible with the
formation of a late-type galaxy from the morphological point of view, can
produce chemical properties in agreement with the available observations.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:30:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Colavitti",
"Edoardo",
""
],
[
"Matteucci",
"Francesca",
""
],
[
"Murante",
"Giuseppe",
""
]
] | [
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0.0152546735,
0.0016705362,
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0.0578122213,
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] |
802.1848 | Nina Markovic | J. L. Wasserman, K. Lucas, S. H. Lee, A. Ashton, C. D. Crowl, and N.
Markovic | Fabrication of One-Dimensional Programmable-Height Nanostructures via
Dynamic Stencil Deposition | 6 pages, 5 figures | null | 10.1063/1.2960573 | null | cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamic stencil deposition (DSD) techniques offer a variety of fabrication
advantages not possible with traditional lithographic processing, such as the
the ability to directly deposit nanostructures with programmable height
profiles. However, DSD systems have not enjoyed widespread usage due to their
complexity. We demonstrate a simple, low-profile, portable, one-dimensional
nanotranslation system that facilitates access to nanoscale DSD abilities.
Furthermore we show a variety of fabricated programmable-height nanostructures,
including parallel arrays of such structures, and suggest other applications
that exploit the unique capabilities of DSD fabrication methods.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:33:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wasserman",
"J. L.",
""
],
[
"Lucas",
"K.",
""
],
[
"Lee",
"S. H.",
""
],
[
"Ashton",
"A.",
""
],
[
"Crowl",
"C. D.",
""
],
[
"Markovic",
"N.",
""
]
] | [
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] |
802.1849 | Kuang-Ta Chao | Zhi-Guo He, Ying Fan, Kuang-Ta Chao | QCD prediction for the non-$D\bar D$ annihilation decay of $\psi(3770)$ | Version published in PRL, errors and typos corrected, references
added | Phys.Rev.Lett.101:112001,2008 | 10.1103/PhysRevLett.101.112001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To clarify the marked difference between BES and CLEO measurements on the
non-$D\bar D$ decays of the $\psi(3770)$, a $1^{3}D_{1}$-dominated charmonium,
we calculate the annihilation decay of $\psi(3770)$ in NRQCD. By introducing
the color-octet contributions, the results are free from infrared divergences.
The color-octet matrix elements are estimated by solving the evolution
equations. The S-D mixing effect is found to be very small. With
$m_{c}=1.5\pm0.1\textrm{GeV}$ our result is $\Gamma(\psi(3770)\to \textrm{light
hadrons})=467^{-187}_{+338}\textrm{KeV}$. For $m_c=1.4$ GeV, together with the
observed hadronic transitions and E1 transitions, the non-$D\bar D$ decay
branching ratio of $\psi(3770)$ could reach about 5%. Our results do not favor
either of the results of BES and CLEO collaborations, and further experimental
tests are urged.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:40:45 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Mar 2008 14:07:03 GMT"
},
{
"version": "v3",
"created": "Tue, 9 Sep 2008 17:14:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"He",
"Zhi-Guo",
""
],
[
"Fan",
"Ying",
""
],
[
"Chao",
"Kuang-Ta",
""
]
] | [
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] |
802.185 | Matteo Petrera | Decio Levi, Matteo Petrera, Christian Scimiterna, Ravil Yamilov | On Miura Transformations and Volterra-Type Equations Associated with the
Adler-Bobenko-Suris Equations | Published in SIGMA (Symmetry, Integrability and Geometry: Methods and
Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4 (2008), 077, 14 pages | 10.3842/SIGMA.2008.077 | null | math-ph math.MP nlin.SI | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We construct Miura transformations mapping the scalar spectral problems of
the integrable lattice equations belonging to the Adler-Bobenko-Suris (ABS)
list into the discrete Schr\"odinger spectral problem associated with
Volterra-type equations. We show that the ABS equations correspond to
B\"acklund transformations for some particular cases of the discrete
Krichever-Novikov equation found by Yamilov (YdKN equation). This enables us to
construct new generalized symmetries for the ABS equations. The same can be
said about the generalizations of the ABS equations introduced by Tongas,
Tsoubelis and Xenitidis. All of them generate B\"acklund transformations for
the YdKN equation. The higher order generalized symmetries we construct in the
present paper confirm their integrability.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:41:32 GMT"
},
{
"version": "v2",
"created": "Sat, 19 Jul 2008 07:00:03 GMT"
},
{
"version": "v3",
"created": "Sat, 8 Nov 2008 17:49:48 GMT"
}
] | 2008-11-08T00:00:00 | [
[
"Levi",
"Decio",
""
],
[
"Petrera",
"Matteo",
""
],
[
"Scimiterna",
"Christian",
""
],
[
"Yamilov",
"Ravil",
""
]
] | [
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] |
802.1851 | Zakia Hammouch | Zakia Hammouch (LAMFA) | Multiple solutions of steady MHD flow of dilatant fluids | null | European Journal of Pure and Applied Mathematics 1, 2 (2008) 11-20 | null | null | physics.class-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider the problem of a steady MHD flow of a non-Newtonian
power-law and electrically conducting fluid in presence of an applied magnetic
field. The boundary layer equations are solved in similarity form via the
Lyapunov energy method, we show that this problem has an infinite number of
positive global solutions.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:06:52 GMT"
},
{
"version": "v2",
"created": "Sun, 6 Jul 2008 12:08:05 GMT"
}
] | 2008-07-06T00:00:00 | [
[
"Hammouch",
"Zakia",
"",
"LAMFA"
]
] | [
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] |
802.1852 | Patrick Huber | Simon Gruener and Patrick Huber | Knudsen Diffusion in Silicon Nanochannels | 4 pages, 3 figures | Physical Review Letters 100, 064502 (2008) | 10.1103/PhysRevLett.100.064502 | null | physics.flu-dyn cond-mat.mtrl-sci cond-mat.stat-mech nlin.SI physics.chem-ph | http://creativecommons.org/licenses/by/3.0/ | Measurements on helium and argon gas flow through an array of parallel,
linear channels of 12 nm diameter and 200 micrometer length in a single
crystalline silicon membrane reveal a Knudsen diffusion type transport from
10^2 to 10^7 in Knudsen number Kn. The classic scaling prediction for the
transport diffusion coefficient on temperature and mass of diffusing
species,D_He ~ sqrt(T), is confirmed over a T range from 40 K to 300 K for He
and for the ratio of D_He/D_Ar ~ sqrt(m_Ar/m_He). Deviations of the channels
from a cylindrical form, resolved with transmission electron microscopy down to
subnanometer scales, quantitatively account for a reduced diffusivity as
compared to Knudsen diffusion in ideal tubular channels. The membrane
permeation experiments are described over 10 orders of magnitude in Kn,
encompassing the transition flow regime, by the unified flow model of Beskok
and Karniadakis.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:51:58 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Gruener",
"Simon",
""
],
[
"Huber",
"Patrick",
""
]
] | [
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802.1853 | Taras Banakh | T.Banakh, V.Gavrylkiv, O.Nykyforchyn | Algebra in superextensions of groups, I: zeros and commutativity | null | Algebra Discrete Math. (2008), no.3, 1-29 | null | null | math.GN math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a group $X$ we study the algebraic structure of its superextension
$\lambda(X)$. This is a right-topological semigroup consisting of all maximal
linked systems on $X$ endowed with the operation $$\mathcal A\circ\mathcal
B=\{C\subset X:\{x\in X:x^{-1}C\in\mathcal B\}\in\mathcal A\}$$ that extends
the group operation of $X$. We characterize right zeros of $\lambda(X)$ as
invariant maximal linked systems on $X$ and prove that $\lambda(X)$ has a right
zero if and only if each element of $X$ has odd order. On the other hand, the
semigroup $\lambda(X)$ contains a left zero if and only if it contains a zero
if and only if $X$ has odd order $|X|\le5$. The semigroup $\lambda(X)$ is
commutative if and only if $|X|\le4$. We finish the paper with a complete
description of the algebraic structure of the semigroups $\lambda(X)$ for all
groups $X$ of cardinality $|X|\le5$.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:52:13 GMT"
}
] | 2011-10-11T00:00:00 | [
[
"Banakh",
"T.",
""
],
[
"Gavrylkiv",
"V.",
""
],
[
"Nykyforchyn",
"O.",
""
]
] | [
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] |
802.1854 | Stephen J. Summers | Stephen J. Summers | Yet More Ado About Nothing: The Remarkable Relativistic Vacuum State | This is an expanded version of an invited talk given at the Symposium
"Deep Beauty: Mathematical Innovation and the Search for an Underlying
Intelligibility of the Quantum World", held at Princeton University on
October 3-4, 2007. 28 pages ; minor revisions made | null | null | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An overview is given of what mathematical physics can currently say about the
vacuum state for relativistic quantum field theories on Minkowski space. Along
with a review of classical results such as the Reeh--Schlieder Theorem and its
immediate and controversial consequences, more recent results are discussed.
These include the nature of vacuum correlations and the degree of entanglement
of the vacuum, as well as the striking fact that the modular objects determined
by the vacuum state and algebras of observables localized in certain regions of
Minkowski space encode a remarkable range of physical information, from the
dynamics and scattering behavior of the theory to the external symmetries and
even the space--time itself. These modular objects also provide an intrinsic
characterization of the vacuum state itself, a fact which is of particular
relevance to the search for criteria to select physically significant reference
states for quantum field theories on curved space--times.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 15:58:09 GMT"
},
{
"version": "v2",
"created": "Fri, 20 Feb 2009 16:23:56 GMT"
}
] | 2009-02-20T00:00:00 | [
[
"Summers",
"Stephen J.",
""
]
] | [
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] |
802.1855 | Tsung-Wen Yeh | Tsung-Wen Yeh | Three Parton Corrections in $B\to PP$ decays | null | null | null | null | hep-ph | null | The $1/m_b$ corrections from the three parton $q\bar{q}g$ Fock state of the
final state light meson in $B\to PP$ decays are evaluated by means of a
collinear expansion method. The impacts of these corrections on the $CP$
averaged branching ratios of the $B\to \pi K$ decays are analyzed.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:39:20 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Yeh",
"Tsung-Wen",
""
]
] | [
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802.1856 | Taras Banakh | Taras Banakh, Volodymyr Gavrylkiv | Algebra in superextension of groups, II: cancelativity and centers | null | Algebra Discrete Math. (2008), no 4, 1-14 | null | null | math.GN math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a countable group $X$ we study the algebraic structure of its
superextension $\lambda(X)$. This is a right-topological semigroup consisting
of all maximal linked systems on $X$ endowed with the operation $$\mathcal
A\circ\mathcal B=\{C\subset X:\{x\in X:x^{-1}C\in\mathcal B\}\in\mathcal A\}$$
that extends the group operation of $X$. We show that the subsemigroup
$\lambda^\circ(X)$ of free maximal linked systems contains an open dense subset
of right cancelable elements. Also we prove that the topological center of
$\lambda(X)$ coincides with the subsemigroup $\lambda^\bullet(X)$ of all
maximal linked systems with finite support. This result is applied to show that
the algebraic center of $\lambda(X)$ coincides with the algebraic center of $X$
provided $X$ is countably infinite. On the other hand, for finite groups $X$ of
order $3\le|X|\le5$ the algebraic center of $\lambda(X)$ is strictly larger
than the algebraic center of $X$.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:06:26 GMT"
}
] | 2011-10-11T00:00:00 | [
[
"Banakh",
"Taras",
""
],
[
"Gavrylkiv",
"Volodymyr",
""
]
] | [
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802.1857 | Emanuele Ripamonti | E. Ripamonti (1,2), M. Mapelli (3), S. Zaroubi (2) ((1) Dipartimento
di Fisica, Universita' di Milano-Bicocca; (2) Kapteyn Astronomical Institute,
University of Groningen; (3) Institute for Theoretical Physics, University of
Z\"urich) | Radiation from early black holes - I: effects on the neutral
inter-galactic medium | 17 pages, 14 figures; accepted for publication on MNRAS | null | 10.1111/j.1365-2966.2008.13104.x | null | astro-ph | null | In the pre-reionization Universe, the regions of the inter-galactic medium
(IGM) which are far from luminous sources are the last to undergo reionization.
Until then, they should be scarcely affected by stellar radiation; instead, the
X-ray emission from an early black hole (BH) population can have much larger
influence. We investigate the effects of such emission, looking at a number of
BH model populations (differing for the cosmological density evolution of BHs,
the BH properties, and the spectral energy distribution of the BH emission). We
find that BH radiation can easily heat the IGM to 10^3-10^4 K, while achieving
partial ionization. The most interesting consequence of this heating is that
BHs are expected to induce a 21-cm signal (delta T_b ~ 20-30 mK at z<~12) which
should be observable with forthcoming experiments (e.g. LOFAR). We also find
that at z<~10 BH emission strongly increases the critical mass separating
star-forming and non-star-forming halos.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:24:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ripamonti",
"E.",
""
],
[
"Mapelli",
"M.",
""
],
[
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""
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802.1858 | Cristinel Diaconu | H1 Collaboration | A Search for Excited Neutrinos in e-p Collisions at HERA | 18 pages, 4 figures, Submitted to Phys. Lett. B | Phys.Lett.B663:382-389,2008 | 10.1016/j.physletb.2008.04.020 | DESY 08-009 | hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A search for excited neutrinos is performed using the full $e^{-}p$ data
sample collected by the H1 experiment at HERA at a centre-of-mass energy of 319
GeV, corresponding to a total luminosity of 184 pb$^{-1}$.The electroweak
decays of excited neutrinos ${\nu}^{*}{\to}{\nu}{\gamma}$,
${\nu}^{*}{\to}{\nu}Z$ and ${\nu}^{*}{\to}eW$ with subsequent hadronic or
leptonic decays of the $W$ and $Z$ bosons are considered. No evidence for
excited neutrino production is found. Mass dependent exclusion limits on
$\nu^*$ production cross sections and on the ratio of the coupling to the
compositeness scale $f/{\Lambda}$ are derived within gauge mediated models. A
limit on $f/{\Lambda}$, independent of the relative couplings to the SU(2) and
U(1) gauge bosons, is also determined. These limits extend the excluded region
to higher masses than has been possible in previous excited neutrino searches.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:13:05 GMT"
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] | 2012-08-27T00:00:00 | [
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802.1859 | Taras Banakh | Volodymyr Gavrylkiv | Right-topological semigroup operations on inclusion hyperspaces | null | Mat. Stud. 29:1 (2008) 18-34 | null | null | math.GN math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that for any discrete semigroup $X$ the semigroup operation can be
extended to a right-topological semigroup operation on the space $G(X)$ of
inclusion hyperspaces on $X$. We detect some important subsemigroups of $G(X)$,
study the minimal ideal, the (topological) center, left cancelable elements of
$G(X)$, and describe the structure of the semigroups $G(\IZ_n)$ for small
numbers $n$.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:13:09 GMT"
}
] | 2012-12-19T00:00:00 | [
[
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"Volodymyr",
""
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] |
802.186 | Nikos Karachalios I | Nikos I. Karachalios and Nikos B. Zographopoulos | A sharp estimate and change on the dimension of the attractor for
Allen-Cahn equations | 9 pages | null | null | null | math.AP math.DS | null | We consider the semilinear reaction diffusion equation
$\partial_t\phi-\nu\Delta\phi-V(x)\phi+f(\phi)=0$, $\nu>0$ in a bounded domain
$\Omega\subset\mathbb{R}^N$. We assume the standard Allen-Cahn-type
nonlinearity, while the potential $V$ is either the inverse square potential
$V(x)=\delta |x|^{-2}$ or the borderline potential $V(x)=\delta
\mathrm{dist}(x,\partial\Omega)^{-2}$, $\delta\geq 0$ (thus including the
classical Allen-Cahn equation as a special case when $\delta=0$). In the
subcritical cases $\delta=0$, $N\geq 1$ and $0<\mu:=\frac{\delta}{\nu}<\mu^*$,
$N\geq 3$ (where $\mu^*$ is the optimal constant of Hardy and Hardy-type
inequalities), we present a new estimate on the dimension of the global
attractor. This estimate comes out by an improved lower bound for sums of
eigenvalues of the Laplacian by A. D. Melas (Proc. Amer. Math. Soc.
\textbf{131} (2003), 631-636). The estimate is sharp, revealing the existence
of (an explicitly given) threshold value for the ratio of the volume to the
moment of inertia of $\Omega$ on which the dimension of the attractor may
considerably change. Consideration is also given on the finite dimensionality
of the global attractor in the critical case $\mu=\mu^*$.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:17:57 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 17:07:05 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Karachalios",
"Nikos I.",
""
],
[
"Zographopoulos",
"Nikos B.",
""
]
] | [
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] |
802.1861 | Chloe Papineau | Chloe Papineau | Finite temperature behaviour of the ISS-uplifted KKLT model | 23 pages, 3 figures, mistake corrected, one plot updated, physical
conclusions unchanged | JHEP 0805:068,2008 | 10.1088/1126-6708/2008/05/068 | DESY-08-012 | hep-th astro-ph hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the static phase structure of the ISS-KKLT model for moduli
stabilisation and uplifting to a zero cosmological constant. Since the
supersymmetry breaking sector and the moduli sector are only gravitationally
coupled, we expect negligible quantum effects of the modulus upon the ISS
sector, and the other way around. Under this assumption, we show that the ISS
fields end up in the metastable vacua. The reason is not only that it is
thermally favoured (second order phase transition) compared to the phase
transition towards the supersymmetric vacua, but rather that the metastable
vacua form before the supersymmetric ones. This nice feature is exclusively due
to the presence of the KKLT sector. We also show that supergravity effects are
negligible around the origin of the field space. Finally, we turn to the
modulus sector and show that there is no destabilisation effect coming from the
ISS sector.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:28:26 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 10:32:29 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Papineau",
"Chloe",
""
]
] | [
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0.0072033009,
-0.0384521522,
-0.1175329983,
0.0419501588
] |
802.1862 | Stefan Vandoren | Stefan Vandoren and Peter van Nieuwenhuizen | Lectures on instantons | 118 pages, 11 figures | null | null | null | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a self-contained set of lecture notes on instantons in (super)
Yang-Mills theory in four dimensions and in quantum mechanics. First the basics
are derived from scratch: the regular and singular one-instanton solutions for
Yang-Mills theories with gauge groups SU(2) and SU(N), their bosonic and
fermionic zero modes, the path integral instanton measure, and supersymmetric
Yang-Mills theories in Euclidean space. Then we discuss applications: the
\theta-angle of QCD, the solution of the U(1) problem, the way Higgs fields
solve the large-instanton problem, and tunneling and phase transitions in
quantum mechanics and in nonabelian gauge theories. These lecture notes are an
extension of a review on Yang-Mills and D-instantons written in 2000 by both
authors and A.Belitsky
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:36:39 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Vandoren",
"Stefan",
""
],
[
"van Nieuwenhuizen",
"Peter",
""
]
] | [
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802.1863 | Philip Lucas | A. F. Beckford (1), P. W. Lucas (1), A. C. Chrysostomou (1), T. M.
Gledhill (1) ((1) University of Hertfordshire) | Near-Infrared Imaging Polarimetry of Young Stellar Objects in
rho-Ophiuchi | 26 pages. Accepted by MNRAS. Available as online early version | null | 10.1111/j.1365-2966.2007.12715.x | null | astro-ph | null | The results of a near-infrared (J H K LP) imaging linear polarimetry survey
of 20 young stellar objects (YSOs) in rho Ophiuchi are presented. The majority
of the sources are unresolved, with K-band polarizations, P_K < 6 per cent.
Several objects are associated with extended reflection nebulae. These objects
have centrosymmetric vector patterns with polarization discs over their cores;
maximum polarizations of P_K > 20 per cent are seen over their envelopes.
Correlations are observed between the degree of core polarization and the
evolutionary status inferred from the spectral energy distribution. K-band core
polarizations >6 per cent are only observed in Class I YSOs. A 3D Monte Carlo
model with oblate grains aligned with a magnetic field is used to investigate
the flux distributions and polarization structures of three of the rho Oph YSOs
with extended nebulae. A rho proportional to r^(-1.5) power law for the density
is applied throughout the envelopes. The large-scale centrosymmetric
polarization structures are due to scattering. However, the polarization
structure in the bright core of the nebula appears to require dichroic
extinction by aligned non-spherical dust grains. The position angle indicates a
toroidal magnetic field in the inner part of the envelope. Since the measured
polarizations attributed to dichroic extinction are usually <10 per cent, the
grains must either be nearly spherical or very weakly aligned. The higher
polarizations observed in the outer parts of the reflection nebulae require
that the dust grains responsible for scattering have maximum grain sizes <=1.05
microns.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 16:48:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Beckford",
"A. F.",
"",
"University of Hertfordshire"
],
[
"Lucas",
"P. W.",
"",
"University of Hertfordshire"
],
[
"Chrysostomou",
"A. C.",
"",
"University of Hertfordshire"
],
[
"Gledhill",
"T. M.",
"",
"University of Hertfordshire"
]
] | [
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] |
802.1864 | David Rafferty | David Rafferty (Penn State), Brian McNamara (Waterloo), Paul Nulsen
(CfA) | The Regulation of Cooling and Star Formation in Luminous Galaxies by AGN
Feedback and the Cooling-Time/Entropy Threshold for the Onset of Star
Formation | 19 pages, 12 figures. Accepted for publication in ApJ. New version
includes our response to minor but helpful comments by the referee. The
abstract and title have been edited to better reflect the major results of
the paper | null | 10.1086/591240 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using broadband optical imaging and Chandra X-ray data for a sample of 46
cluster central dominant galaxies (CDGs), we investigate the connection between
star formation, the intracluster medium (ICM), and the central active galactic
nucleus (AGN). We report the discovery of a remarkably sharp threshold for the
onset of star formation that occurs when the central cooling time of the hot
atmosphere falls below ~ 5x10^8 yr, or equivalently when the central entropy
falls below ~ 30 keV cm^2. In addition to this criterion, star formation in
cooling flows also appears to require that the X-ray and galaxy centroids lie
within ~ 20 kpc of each other, and that the jet (cavity) power is smaller than
the X-ray cooling luminosity. These three criteria, together with the high
ratio of cooling time to AGN outburst (cavity) age across our sample, directly
link the presence of star formation and AGN activity in CDGs to cooling
instabilities in the intracluster plasma. Our results provide compelling
evidence that AGN feedback into the hot ICM is largely responsible for
regulating cooling and star formation in the cores of clusters, leading to the
significant growth of supermassive black holes in CDGs at late times.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:49:24 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jun 2008 19:41:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rafferty",
"David",
"",
"Penn State"
],
[
"McNamara",
"Brian",
"",
"Waterloo"
],
[
"Nulsen",
"Paul",
"",
"CfA"
]
] | [
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] |
802.1865 | Andrew R. Wade | Mikhail V. Menshikov, Marina Vachkovskaia, Andrew R. Wade | Asymptotic behaviour of randomly reflecting billiards in unbounded
tubular domains | 41 pages, 5 figures; v3: some typos corrected | Journal of Statistical Physics, Vol. 132 (2008), no. 6, p.
1097-1133 | 10.1007/s10955-008-9578-z | null | math.PR math-ph math.MP | null | We study stochastic billiards in infinite planar domains with curvilinear
boundaries: that is, piecewise deterministic motion with randomness introduced
via random reflections at the domain boundary. Physical motivation for the
process originates with ideal gas models in the Knudsen regime, with particles
reflecting off microscopically rough surfaces. We classify the process into
recurrent and transient cases. We also give almost-sure results on the
long-term behaviour of the location of the particle, including a
super-diffusive rate of escape in the transient case. A key step in obtaining
our results is to relate our process to an instance of a one-dimensional
stochastic process with asymptotically zero drift, for which we prove some new
almost-sure bounds of independent interest. We obtain some of these bounds via
an application of general semimartingale criteria, also of some independent
interest.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:09:43 GMT"
},
{
"version": "v2",
"created": "Mon, 12 May 2008 17:18:14 GMT"
},
{
"version": "v3",
"created": "Wed, 28 May 2008 16:36:37 GMT"
}
] | 2008-08-30T00:00:00 | [
[
"Menshikov",
"Mikhail V.",
""
],
[
"Vachkovskaia",
"Marina",
""
],
[
"Wade",
"Andrew R.",
""
]
] | [
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] |
802.1866 | Herve Bourdin | H. Bourdin, P. Mazzotta | Temperature structure of the intergalactic medium within seven nearby
and bright clusters of galaxies observed with XMM-Newton | published in A&A | Astron.Astrophys.479:3078,2008 | 10.1051/0004-6361:20065758 | null | astro-ph | null | Aims. We map the temperature structure of the intra-cluster medium (ICM)
within a nearly complete X-ray flux limited sample of galaxy clusters in the
redshift range z=[0.045,0.096]. Our sample contains seven bright clusters of
galaxies observed with XMM-Newton: Abell 399, Abell 401, Abell 478, Abell 1795,
Abell 2029, Abell 2065, Abell 2256.
Methods. We use a multi-scale spectral mapping algorithm especially designed
to map spectroscopic observables from X-ray extended emission of the ICM.
Derived from a former algorithm using Haar wavelets, our algorithm is now
implemented with B-spline wavelets in order to perform a more regular analysis
of the signal.
Results. For the four clusters in our sample that are major mergers, we find
a complex thermal structure with strong thermal variations consistent with
their dynamics. For two of them, A2065 and A2256, we perform a 3-d analysis of
cold front features evidenced from the gas temperature and brightness maps.
Furthermore, we detect a significant non-radial thermal structure outside the
cool core region of the other 3 more "regular" clusters, with relative
amplitudes of about about 10%. We investigate possible implications of this
structure on the mass estimates of the "regular" clusters A1795 and A2029, by
extracting surface brightness and temperature profiles from sectors
correspondings to the hottest and coldest regions in the maps. While
compensating with surface brightness for A2029, leading to consistent mass
profiles, the temperature structure leads to significant mass discrepancies in
the innermost region of A1795.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:43:33 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bourdin",
"H.",
""
],
[
"Mazzotta",
"P.",
""
]
] | [
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] |
802.1867 | David Coule | D.H. Coule | Holography constrains quantum bounce | updated version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent work in quantum loop cosmology suggests the universe undergoes a
bounce when evolving from a previous collapsing phase. However, with
non-inflationary matter sources, the scenario appears to strongly violate the
holography bound S\leq A/4 during the bounce, where A now represents the
cross-sectional area of the bounce. We also give a simple argument why any
inflationary phase after the bounce is unlikely due to prior dissipation of a
scalar field kinetic energy phase into regular matter components.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:13:36 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Aug 2010 17:53:04 GMT"
},
{
"version": "v3",
"created": "Mon, 8 Nov 2010 17:07:05 GMT"
},
{
"version": "v4",
"created": "Tue, 18 Dec 2012 19:41:51 GMT"
}
] | 2012-12-19T00:00:00 | [
[
"Coule",
"D. H.",
""
]
] | [
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] |
802.1868 | Pawel Jakubczyk | P. Jakubczyk, P. Strack, A.A. Katanin, W. Metzner | Renormalization group for phases with broken discrete symmetry near
quantum critical points | Updated version (as published) | Phys.Rev.B77:195120,2008 | 10.1103/PhysRevB.77.195120 | null | cond-mat.str-el cond-mat.stat-mech hep-th | null | We extend the Hertz-Millis theory of quantum phase transitions in itinerant
electron systems to phases with broken discrete symmetry. Using a set of
coupled flow equations derived within the functional renormalization group
framework, we compute the second order phase transition line T_c(delta), with
delta a non-thermal control parameter, near a quantum critical point. We
analyze the interplay and relative importance of quantum and classical
fluctuations at different energy scales, and we compare the Ginzburg
temperature T_G to the transition temperature T_c, the latter being associated
with a non-Gaussian fixed-point.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:41:53 GMT"
},
{
"version": "v2",
"created": "Fri, 23 May 2008 11:02:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jakubczyk",
"P.",
""
],
[
"Strack",
"P.",
""
],
[
"Katanin",
"A. A.",
""
],
[
"Metzner",
"W.",
""
]
] | [
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] |
802.1869 | H. J. Hilhorst | H.J. Hilhorst and P. Calka | Random line tessellations of the plane: statistical properties of
many-sided cells | 26 pages, 3 figures | J. Stat. Phys.132 (2008) 627-647 | 10.1007/s10955-008-9577-0 | LPT Orsay 08-17 | cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a family of random line tessellations of the Euclidean plane
introduced in a much more formal context by Hug and Schneider [Geom. Funct.
Anal. 17, 156 (2007)] and described by a parameter \alpha\geq 1. For \alpha=1
the zero-cell (that is, the cell containing the origin) coincides with the
Crofton cell of a Poisson line tessellation, and for \alpha=2 it coincides with
the typical Poisson-Voronoi cell. Let p_n(\alpha) be the probability for the
zero-cell to have n sides. By the methods of statistical mechanics we construct
the asymptotic expansion of \log p_n(\alpha) up to terms that vanish as
n\to\infty. In the large-n limit the cell is shown to become circular. The
circle is centered at the origin when \alpha>1, but gets delocalized for the
Crofton cell, \alpha=1, which is a singular point of the parameter range. The
large-n expansion of \log p_n(1) is therefore different from that of the
general case and we show how to carry it out. As a corollary we obtain the
analogous expansion for the {\it typical} n-sided cell of a Poisson line
tessellation.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:21:28 GMT"
}
] | 2010-08-26T00:00:00 | [
[
"Hilhorst",
"H. J.",
""
],
[
"Calka",
"P.",
""
]
] | [
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] |
802.187 | Daniele Binosi | A. C. Aguilar, D. Binosi and J. Papavassiliou | Gluon and ghost propagators in the Landau gauge: Deriving lattice
results from Schwinger-Dyson equations | 9 pages, 2 figures; v3: typos corrected; v2: discussion on numerical
results expanded, considerations about the Kugo-Ojima confinement criterion
added | Phys.Rev.D78:025010,2008 | 10.1103/PhysRevD.78.025010 | ECT*-08-02 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the application of a novel gauge invariant truncation scheme to
the Schwinger-Dyson equations of QCD leads, in the Landau gauge, to an infrared
finite gluon propagator and a divergent ghost propagator, in qualitative
agreement with recent lattice data.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:21:57 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Jun 2008 18:05:20 GMT"
},
{
"version": "v3",
"created": "Mon, 31 Aug 2009 14:03:28 GMT"
}
] | 2009-08-31T00:00:00 | [
[
"Aguilar",
"A. C.",
""
],
[
"Binosi",
"D.",
""
],
[
"Papavassiliou",
"J.",
""
]
] | [
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] |
802.1871 | Alexander Bolonkin | Alexander Bolonkin | AB-Net Method of Protection from Projectiles (city, military base,
battle-front, etc.) | 20 pages, 10 figures, 1 table | null | null | null | physics.gen-ph physics.soc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The author suggests a low cost special AB-Net from artificial fiber, which
may protect cities and important objects from rockets, artillery and mortar
shells, projectiles, bullets, and strategic weapons. The idea is as follows:
The offered AB-Net joins an incoming projectile to a small braking parachute
and this incoming projectile loses speed by air braking after a drag distance
of 50 - 150 meters. A following interception net after the first may serve to
collect the slowed projectiles and their fragments or bomblets so that they do
not reach the aimpoint. The author offers the design of AB-Net, a developed
theory of snagging with a small braking parachute by AB-Net; and sample
computations. These nets may be used for defense of a town, city, military
base, battle-front line, road (from terrorists), or any important objects or
installations (for example nuclear electric station, government buildings,
etc.). Computed projects are: Net to counter small rockets (for example, from
Qassam), net to counter artillery projectile (caliber 76 mm), net to counter
bullets (caliber 7.6 mm).
The offered method is cheaper by thousands of times than protection of a city
by current anti-rocket systems. Discussion and results are at the end of the
article.
Key words: Protection from missile and projectile weapons, mortar, rocket,
AB-Net, Qassam defense, incoming defense, armor.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:28:11 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Bolonkin",
"Alexander",
""
]
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802.1872 | Pere Ara | Pere Ara | The realization problem for von Neumann regular rings | 15 pages, survey paper. It contains a new version of Proposition 4.1,
due to Ken Goodearl | Ring Theory 2007. Proceedings of the Fifth China-Japan-Korea
Conference, (eds. H. Marubayashi, K. Masaike, K. Oshiro, M. Sato); World
Scientific, 2009, pp. 21--37 | null | null | math.RA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We survey recent progress on the realization problem for von Neumann regular
rings, which asks whether every countable conical refinement monoid can be
realized as the monoid of isoclasses of finitely generated projective right
$R$-modules over a von Neumann regular ring $R$.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:33:58 GMT"
},
{
"version": "v2",
"created": "Fri, 20 Mar 2015 14:07:01 GMT"
}
] | 2015-03-23T00:00:00 | [
[
"Ara",
"Pere",
""
]
] | [
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] |
802.1873 | Antonio Lopez Maroto | Antonio Dobado, Antonio L. Maroto | An introduction to the dark energy problem | 9 pages, 2 figures. Contribution to the proceedings of "Space
Astronomy: The UV window to the Universe", El Escorial, Spain, 2007 | Astrophys.Space Sci.320:167-171,2009 | 10.1007/s10509-008-9759-x | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we review briefly the origin and history of the cosmological
constant and its recent reincarnation in the form of the dark energy component
of the universe. We also comment on the fundamental problems associated to its
existence and magnitude which require and urgent solution for the sake of the
internal consistency of theoretical physics.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:36:35 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Dobado",
"Antonio",
""
],
[
"Maroto",
"Antonio L.",
""
]
] | [
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802.1874 | Stephen Jordan | Stephen P. Jordan and Edward Farhi | Perturbative Gadgets at Arbitrary Orders | Corrected an error: U dagger vs. U inverse | Phys. Rev. A 77, 062329 (2008) | 10.1103/PhysRevA.77.062329 | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adiabatic quantum algorithms are often most easily formulated using many-body
interactions. However, experimentally available interactions are generally
two-body. In 2004, Kempe, Kitaev, and Regev introduced perturbative gadgets, by
which arbitrary three-body effective interactions can be obtained using
Hamiltonians consisting only of two-body interactions. These three-body
effective interactions arise from the third order in perturbation theory. Since
their introduction, perturbative gadgets have become a standard tool in the
theory of quantum computation. Here we construct generalized gadgets so that
one can directly obtain arbitrary k-body effective interactions from two-body
Hamiltonians. These effective interactions arise from the kth order in
perturbation theory.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:36:51 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Jun 2008 04:15:48 GMT"
},
{
"version": "v3",
"created": "Mon, 2 Nov 2009 17:41:12 GMT"
},
{
"version": "v4",
"created": "Tue, 31 Jan 2012 16:47:19 GMT"
}
] | 2012-02-01T00:00:00 | [
[
"Jordan",
"Stephen P.",
""
],
[
"Farhi",
"Edward",
""
]
] | [
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802.1875 | Mario Novello | M. Novello, Aline N. Araujo and J. M. Salim | Cyclic Magnetic Universe | null | Int.J.Mod.Phys.A24:5639-5658,2009 | 10.1142/S0217751X09046321 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent works have shown the important role Nonlinear Electrodynamics (NLED)
can have in two crucial questions of Cosmology, concerning particular moments
of its evolution for very large and for low-curvature regimes, that is for very
condensed phase and at the present period of acceleration. We present here a
toy model of a complete cosmological scenario in which the main factor
responsible for the geometry is a nonlinear magnetic field which produces a FRW
homogeneous and isotropic geometry. In this scenario we distinguish four
distinct phases: a bouncing period, a radiation era, an acceleration era and a
re-bouncing. It has already been shown that in NLED a strong magnetic field can
overcome the inevitability of a singular region typical of linear Maxwell
theory; on the other extreme situation, that is for very weak magnetic field it
can accelerate the expansion. The present model goes one step further: after
the acceleration phase the universe re-bounces and enter in a collapse era.
This behavior is a manifestation of the invariance under the dual map of the
scale factor $ a(t) \to 1/ a(t),$ a consequence of the corresponding inverse
symmetry of the electromagnetic field ($ F \to 1/ F,$ where $F \equiv
F^{\mu\nu}F_{\mu\nu}$) of the NLED theory presented here. Such sequence
collapse-bouncing-expansion-acceleration-re-bouncing-collapse constitutes a
basic unitary element for the structure of the universe that can be repeated
indefinitely yielding what we call a Cyclic Magnetic Universe.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:37:12 GMT"
}
] | 2010-01-07T00:00:00 | [
[
"Novello",
"M.",
""
],
[
"Araujo",
"Aline N.",
""
],
[
"Salim",
"J. M.",
""
]
] | [
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] |
802.1876 | Roberto Pittau | Giovanni Ossola, Costas G. Papadopoulos, Roberto Pittau | On the Rational Terms of the one-loop amplitudes | 14 pages, 3 figures, uses axodraw.sty | JHEP0805:004,2008 | 10.1088/1126-6708/2008/05/004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The various sources of Rational Terms contributing to the one-loop amplitudes
are critically discussed. We show that the terms originating from the generic
(n-4)-dimensional structure of the numerator of the one-loop amplitude can be
derived by using appropriate Feynman rules within a tree-like computation. For
the terms that originate from the reduction of the 4-dimensional part of the
numerator, we present two different strategies and explicit algorithms to
compute them.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 17:57:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ossola",
"Giovanni",
""
],
[
"Papadopoulos",
"Costas G.",
""
],
[
"Pittau",
"Roberto",
""
]
] | [
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802.1877 | Alberto Barchielli | Alberto Barchielli, Matteo Gregoratti | Quantum continual measurements: the spectrum of the output | 13 pages, 2 figures. Submitted to the proceedings of the 28-th
Conference on Quantum Probability and Related Topics, 2-8 september 2007,
CIMAT-Guanajuato, MEXICO | Quantum Probability Series QP-PQ Vol. 23 (World Scientific,
Singapore, 2008) pp. 63-76 | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When a quantum system is monitored in continuous time, the result of the
measurement is a stochastic process. When the output process is stationary, at
least in the long run, the spectrum of the process can be introduced and its
properties studied. A typical continual measurement for quantum optical systems
is the so called homodyne detection. In this paper we show how the Heisenberg
uncertainty relations give rise to characteristic bounds on the possible
homodyne spectra and we discuss how this is related to the typical quantum
phenomenon of squeezing.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:04:34 GMT"
}
] | 2009-10-09T00:00:00 | [
[
"Barchielli",
"Alberto",
""
],
[
"Gregoratti",
"Matteo",
""
]
] | [
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802.1878 | Stefano Forte | Fabrizio Caola, Stefano Forte | Geometric Scaling from GLAP evolution | Final version, published in Phys. Rev. Letters. References and minor
clarifications added. 4 pages, 5 figures, LaTeX with REVTeX | Phys.Rev.Lett.101:022001,2008 | 10.1103/PhysRevLett.101.022001 | IFUM-914-FT | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the geometric scaling of the total virtual photon-proton cross
section data can be explained using standard linear GLAP perturbative evolution
with generic boundary conditions in a wide kinematic region. This allows us to
single out the region where geometric scaling may provide evidence for parton
saturation.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:07:39 GMT"
},
{
"version": "v2",
"created": "Sat, 9 Aug 2008 11:10:33 GMT"
}
] | 2010-03-25T00:00:00 | [
[
"Caola",
"Fabrizio",
""
],
[
"Forte",
"Stefano",
""
]
] | [
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] |
802.1879 | Leonid I. Ognev Dr. | L.I.Ognev | Optimization of compact Soller collimator | 15 pages, 7 figures | null | null | Preprint IAE-6501/14, 2007 | physics.optics | null | The opportunity of optimization of collimator was investigated by changing
collimator length, material and wall roughness for soft x-ray radiation with
wavelength 4 nm corresponding to carbon atoms absorption. From the obtained
results follows that effects of diffraction become significant for channel
widths up to 0.02 - 0.04 mm. Collimation angle was limited to 0.014 and 0.007
radian for carbon dust detection. The choice of lighter material with greater
height of roughness in shorter collimator with 2 reflections results in
considerably lower losses than for heavier materials and smoother walls where 4
reflections required.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:29:24 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Ognev",
"L. I.",
""
]
] | [
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] |
802.188 | Arturas Vailionis | Arturas Vailionis, Wolter Siemons and Gertjan Koster | Room temperature Epitaxial Stabilization of a Tetragonal Phase in ARuO3
(A=Ca,Sr) Thin Films | 7 pages, 4 figures | null | 10.1063/1.2967878 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that SrRuO3 and CaRuO3 thin films undergo a room temperature
structural phase transition driven by the substrate imposed epitaxial biaxial
strain. As tensile strain increases, ARuO3 (A=Ca, Sr) films transform from the
orthorhombic phase which is usually observed in bulk SrRuO3 and CaRuO3 at room
temperature, into a tetragonal phase which in bulk samples is only stable at
higher temperatures. More importantly, we show that the observed phenomenon
strongly affects the electronic and magnetic properties of ARuO3 thin films
that are grown on different single crystal substrates which in turn offers the
possibility to tune these properties.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:19:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Vailionis",
"Arturas",
""
],
[
"Siemons",
"Wolter",
""
],
[
"Koster",
"Gertjan",
""
]
] | [
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] |
802.1881 | Antonio Chrysostomou | A. Chrysostomou, F. Bacciotti, B. Nisni, T.P. Ray, J. Eisloffel, C.J.
Davis, M. Takami | Investigating the transport of angular momentum from young stellar
objects: do H2 jets from Class I YSOs rotate? | 11 pages, 5 figures, accepted for publication in Astronomy &
Astrophysics | null | 10.1051/0004-6361:20078494 | null | astro-ph | null | In this pilot study, we examine molecular jets from the embedded Class I
sources, HH 26 and HH 72, to search, for the first time, for kinematic
signatures of jet rotation from young embedded sources.High resolution
long-slit spectroscopy of the H2 1-0 S(1) transition was obtained using
VLT/ISAAC, position-velocity (PV) diagrams constructed and intensity-weighted
radial velocities transverse to the jet flow measured. Mean intensity-weighted
velocities vary between vLSR ~ -90 and -65 km/s for HH 26, and -60 and -10 km/s
for HH 72; maxima occur close to the intensity peak and decrease toward the jet
borders. Velocity dispersions are ~ 45 and ~ 80 km/s for HH 26 and HH 72,
respectively, with gas motions as fast as -100 km/s present. Asymmetric PV
diagrams are seen for both objects which a simple empirical model of a
cylindrical jet section shows could in principle be reproduced by jet rotation
alone. Assuming magneto-centrifugal launching, the observed HH 26 flow may
originate at a disk radius of 2-4 AU from the star with the toroidal component
of the magnetic field dominant at the observed location, in agreement with
magnetic collimation models. We estimate that the kinetic angular momentum
transported by the HH 26 jet is ~ 2E5 M_sun/yr AU km/s. This value (a lower
limit to the total angular momentum transported by the flow) already amounts to
70% of the angular momentum that has to be extracted from the disk for the
accretion to proceed at the observed rate.
The results of this pilot study suggest that jet rotation may also be present
at early evolutionary phases and supports the hypothesis that they carry away
excess angular momentum, thus allowing the central protostar to increase its
mass.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:34:47 GMT"
},
{
"version": "v2",
"created": "Sat, 16 Feb 2008 02:22:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Chrysostomou",
"A.",
""
],
[
"Bacciotti",
"F.",
""
],
[
"Nisni",
"B.",
""
],
[
"Ray",
"T. P.",
""
],
[
"Eisloffel",
"J.",
""
],
[
"Davis",
"C. J.",
""
],
[
"Takami",
"M.",
""
]
] | [
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] |
802.1882 | Mikko Leskinen | M. J. Leskinen, V. Apaja, J. Kajala, P. Torma | Quasiparticles, coherence and nonlinearity: exact simulations of
RF-spectroscopy of strongly interacting one-dimensional Fermi gases | Journal version | Phys. Rev. A 78, 023602 (2008) | 10.1103/PhysRevA.78.023602 | null | cond-mat.supr-con cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider RF-spectroscopy of ultracold Fermi gases by exact simulations of
the many-body state and the coherent dynamics in one dimension. Deviations from
the linear response sum rule result are found to suppress the pairing
contribution to the RF line shifts. We compare the coherent rotation and
quasiparticle descriptions of RF-spectroscopy which are analogous to NMR
experiments in superfluid $^3$He and tunneling in solids, respectively. We
suggest that RF-spectroscopy in ultracold gases provides an interesting
crossover between these descriptions that could be used for studying
decoherence in quantum measurement, in the context of many-body quantum states.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:49:16 GMT"
},
{
"version": "v2",
"created": "Thu, 14 Feb 2008 17:19:29 GMT"
},
{
"version": "v3",
"created": "Tue, 18 Mar 2008 14:59:30 GMT"
},
{
"version": "v4",
"created": "Fri, 30 May 2008 12:20:27 GMT"
},
{
"version": "v5",
"created": "Wed, 20 Aug 2008 06:15:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Leskinen",
"M. J.",
""
],
[
"Apaja",
"V.",
""
],
[
"Kajala",
"J.",
""
],
[
"Torma",
"P.",
""
]
] | [
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] |
802.1883 | Friedwardt Winterberg | F. Winterberg and L. F. Wanex | Thermonuclear Fusion with the Sheared Flow Stabilized Z-Pinch | 20 pages and 6 figures | null | null | null | physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two basic approaches to producing thermonuclear fusion with a sheared flow
stabilized z-pinch are considered. One consists of heating the entire length of
the z-pinch column to the required temperatures. The other basic approach
considered here involves the concept of fast ignition. A localized "hot-spot"
is produced under the proper conditions to ignite a thermonuclear burn wave in
the z-pinch plasma. Here we demonstrate that sheared flow stabilization is more
efficient in the fast-ignition method with isentropic compression then in a
z-pinch where the entire plasma column is heated.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:40:19 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Winterberg",
"F.",
""
],
[
"Wanex",
"L. F.",
""
]
] | [
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] |
802.1884 | Henning Schnoor | Edith Hemaspaandra and Henning Schnoor | On the Complexity of Elementary Modal Logics | Full version of STACS 2008 paper | null | null | null | cs.CC cs.LO | null | Modal logics are widely used in computer science. The complexity of modal
satisfiability problems has been investigated since the 1970s, usually proving
results on a case-by-case basis. We prove a very general classification for a
wide class of relevant logics: Many important subclasses of modal logics can be
obtained by restricting the allowed models with first-order Horn formulas. We
show that the satisfiability problem for each of these logics is either
NP-complete or PSPACE-hard, and exhibit a simple classification criterion.
Further, we prove matching PSPACE upper bounds for many of the PSPACE-hard
logics.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:57:26 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Hemaspaandra",
"Edith",
""
],
[
"Schnoor",
"Henning",
""
]
] | [
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] |
802.1885 | Marc Casals | Marc Casals | Electromagnetic Quantum Field Theory on Kerr-Newman Black Holes | Ph.D. thesis. University College Dublin, 2004. Advisor: Adrian C.
Ottewill | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study classical and quantum aspects of electromagnetic perturbations on
black hole space-times. We develop an elegant formalism introduced by Wald,
which sets up the theory of linear perturbations in a Type-D background in a
compact and transparent manner. We derive expressions for the electromagnetic
potential in terms of the single Newman-Penrose scalar \phi_0.This enables the
formulation of the quantum theory of the electromagnetic field as that of a
complex scalar field.
We study the separable field equations obeyed by the various Newman-Penrose
scalars in the Kerr-Newman background and find, for various limits, the
asymptotic behaviour of the radial and angular solutions. We correct and build
on a study by Breuer, Ryan and Waller to find a uniformly valid asymptotic
behaviour for large frequency of the angular solutions and the eigenvalues.
We follow Candelas, Chrzanowski and Howard (CCH) in their canonical
quantization of the electromagnetic potential and field. We perform an
asymptotic analysis of the form of the renormalized stress-energy tensor (RSET)
in the past Boulware state close to the horizon. Unlike results in CCH, its
leading order behaviour close to the horizon corresponds to minus the stress
tensor of a thermal distribution at the Hawking temperature rigidly rotating
with the horizon. We prove that expressions in CCH for the expectation value of
the stress tensor in the past Boulware, past Unruh and |CCH> states lead to a
lack of symmetry of the RSET under parity, even though this is a symmetry of
the physical system. We derive the correct symmetric expressions and present a
detailed analysis of the resulting RSETs.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 18:14:37 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Casals",
"Marc",
""
]
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802.1886 | David Freeman | David Freeman, Peter Stevenhagen, and Marco Streng | Abelian Varieties with Prescribed Embedding Degree | to appear in ANTS-VIII | null | null | Algorithmic number theory, 60--73, Lecture Notes in Comput. Sci.,
5011, Springer, Berlin, 2008 | math.NT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an algorithm that, on input of a CM-field $K$, an integer $k\ge1$,
and a prime $r \equiv 1 \bmod k$, constructs a $q$-Weil number $\pi \in \O_K$
corresponding to an ordinary, simple abelian variety $A$ over the field $\F$ of
$q$ elements that has an $\F$-rational point of order $r$ and embedding degree
$k$ with respect to $r$. We then discuss how CM-methods over $K$ can be used to
explicitly construct $A$.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:10:51 GMT"
}
] | 2021-03-30T00:00:00 | [
[
"Freeman",
"David",
""
],
[
"Stevenhagen",
"Peter",
""
],
[
"Streng",
"Marco",
""
]
] | [
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] |
802.1887 | Peter Chami | Peter S Chami and Norris Sookoo | Induced Measures on "Mu**"- measurable Sets | null | null | null | null | math.FA | http://creativecommons.org/licenses/by/3.0/ | We investigate extension of a measure to a very general set of undetermined
structure. Structure may be imposed on this set in special cases
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:23:22 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Chami",
"Peter S",
""
],
[
"Sookoo",
"Norris",
""
]
] | [
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] |
802.1888 | K Sreeram | K. Sreeram, S. Birenjith and P. Vijay Kumar | Multi-hop Cooperative Wireless Networks: Diversity Multiplexing Tradeoff
and Optimal Code Design | null | null | null | null | cs.IT math.IT | null | We consider single-source single-sink (ss-ss) multi-hop networks, with
slow-fading links and single-antenna half-duplex relays. We identify two
families of networks that are multi-hop generalizations of the well-studied
two-hop network: K-Parallel-Path (KPP) networks and layered networks. KPP
networks can be viewed as the union of K node-disjoint parallel relaying paths,
each of length greater than one. KPP networks are then generalized to KPP(I)
networks, which permit interference between paths and to KPP(D) networks, which
possess a direct link from source to sink. We characterize the DMT of these
families of networks completely for K > 3. Layered networks are networks
comprising of relaying layers with edges existing only within the same layer or
between adjacent layers. We prove that a linear DMT between the maximum
diversity d_{max} and the maximum multiplexing gain of 1 is achievable for
fully-connected layered networks. This is shown to be equal to the optimal DMT
if the number of layers is less than 4. For multi-antenna KPP and layered
networks, we provide an achievable DMT region.
For arbitrary ss-ss single-antenna directed-acyclic full-duplex networks, we
prove that a linear tradeoff between maximum diversity and maximum multiplexing
gain is achievable. All protocols in this paper are explicit and use only
amplify and forward (AF) relaying. We also construct codes with short
block-lengths based on cyclic division algebras that achieve the optimal DMT
for all the proposed schemes. Two key implications of the results in the paper
are that the half-duplex constraint does not entail any rate loss for a large
class of networks and that simple AF protocols are often sufficient to attain
the optimal DMT.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 20:57:54 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Sreeram",
"K.",
""
],
[
"Birenjith",
"S.",
""
],
[
"Kumar",
"P. Vijay",
""
]
] | [
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802.1889 | Emanuele Berti | Emanuele Berti, Vitor Cardoso | Quasinormal modes and thermodynamic phase transitions | 3 pages, submitted to Phys.Rev.D as a Brief Report | Phys.Rev.D77:087501,2008 | 10.1103/PhysRevD.77.087501 | null | hep-th gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been suggested that scalar, Dirac and Rarita-Schwinger
perturbations are related to thermodynamic phase transitions of charged
(Reissner-Nordstr\"om) black holes. In this note we show that this result is
probably a numerical coincidence, and that the conjectured correspondence does
not straightforwardly generalize to other metrics, such as Kerr or
Schwarzschild (anti-)de Sitter. Our calculations do not rule out a relation
between dynamical and thermodynamical properties of black holes, but they
suggest that such a relation is non-trivial.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:29:29 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
]
] | [
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] |
802.189 | M. Rowan-Robinson | Michael Rowan-Robinson (Imperial College London), Tom Babbedge
(Imperial College London), Seb Oliver (University of Sussex), Markos Trichas
(Imperial College London), Stefano Berta (Universita di Padova), Carol
Lonsdale (UCSD), Gene Smith, David Shupe (SSC), Jason Surace (SSC), Stephane
Arnouts (LAM), Olivier LeFevre (LAM), Alejandro Afonso-Luis (IAC), Ismael
Perez-Fournon (IAC), Evanthia Hatziminaoglou (IAC), Maria Polletta (UCSD),
Duncan Farrah (Cornell University), Mattia Vaccari (Universita di Padova) | Photometric redshifts in the SWIRE Survey | 22 pages, 23 figures. Accepted for publication in MNRAS. Revised
28/2/08. Version with figures at full resolution at
http://astro.ic.ac.uk/~mrr/swirephotzcat/swirephotz5.pdf.gz | MNRAS 386, 697 (2008) | 10.1111/j.1365-2966.2008.13109.x | null | astro-ph | null | We present the SWIRE Photometric Redshift Catalogue, 1025119 redshifts of
unprecedented reliability and accuracy. Our method is based on fixed galaxy and
QSO templates applied to data at 0.36-4.5 mu, and on a set of 4 infrared
emission templates fitted to infrared excess data at 3.6-170 mu. The code
involves two passes through the data, to try to optimize recognition of AGN
dust tori. A few carefully justified priors are used and are the key to
supression of outliers. Extinction, A_V, is allowed as a free parameter. We use
a set of 5982 spectroscopic redshifts, taken from the literature and from our
own spectroscopic surveys, to analyze the performance of our method as a
function of the number of photometric bands used in the solution and the
reduced chi^2. For 7 photometric bands the rms value of
(z_{phot}-z_{spec})/(1+z_{spec}) is 3.5%, and the percentage of catastrophic
outliers is ~1%.
We discuss the redshift distributions at 3.6 and 24 mu. In individual fields,
structure in the redshift distribution corresponds to clusters which can be
seen in the spectroscopic redshift distribution. 10% of sources in the SWIRE
photometric redshift catalogue have z >2, and 4% have z>3, so this catalogue is
a huge resource for high redshift galaxies.
A key parameter for understanding the evolutionary status of infrared
galaxies is L_{ir}/L_{opt}, which can be interpreted as the specific
star-formation rate for starbursts. For dust tori around Type 1 AGN,
L_{tor}/L_{opt} is a measure of the torus covering factor and we deduce a mean
covering factor of 40%.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:42:49 GMT"
},
{
"version": "v2",
"created": "Wed, 20 Feb 2008 10:52:10 GMT"
},
{
"version": "v3",
"created": "Thu, 28 Feb 2008 18:17:12 GMT"
},
{
"version": "v4",
"created": "Sat, 5 Apr 2008 16:33:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rowan-Robinson",
"Michael",
"",
"Imperial College London"
],
[
"Babbedge",
"Tom",
"",
"Imperial College London"
],
[
"Oliver",
"Seb",
"",
"University of Sussex"
],
[
"Trichas",
"Markos",
"",
"Imperial College London"
],
[
"Berta",
"Stefano",
"",
"Universita di Padova"
],
[
"Lonsdale",
"Carol",
"",
"UCSD"
],
[
"Smith",
"Gene",
"",
"SSC"
],
[
"Shupe",
"David",
"",
"SSC"
],
[
"Surace",
"Jason",
"",
"SSC"
],
[
"Arnouts",
"Stephane",
"",
"LAM"
],
[
"LeFevre",
"Olivier",
"",
"LAM"
],
[
"Afonso-Luis",
"Alejandro",
"",
"IAC"
],
[
"Perez-Fournon",
"Ismael",
"",
"IAC"
],
[
"Hatziminaoglou",
"Evanthia",
"",
"IAC"
],
[
"Polletta",
"Maria",
"",
"UCSD"
],
[
"Farrah",
"Duncan",
"",
"Cornell University"
],
[
"Vaccari",
"Mattia",
"",
"Universita di Padova"
]
] | [
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802.1891 | Jiming Shi | Jiming Shi and Julian H. Krolik | Radiation Pressure Supported AGN Tori with Hard X-Ray and Stellar
Heating | 27 pages, 8 figures, accepted by ApJ | null | 10.1086/587507 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics and structure of toroidal obscuration around AGN remain
uncertain and controversial. In this paper we extend earlier work on the
dynamical role of infrared radiation pressure by adding the effects of two
kinds of distributed heating: Compton-heating due to hard X-rays from the
nucleus and local starlight heating. We find numerical solutions to the
axisymmetric hydrostatic equilibrium, energy balance, and photon diffusion
equations including these effects. Within the regime of typical parameters, the
two different sources of additional heating have very similar effects: the
density profile within the torus becomes shallower both radially and
vertically, but for plausible heating rates, there is only minor change
(relative to the source-free case) in the distribution of column density with
solid angle. The most interesting consequence of distributed heating is that it
selects out a relatively narrow range of parameters permitting an equilibrium,
particularly $(L/L_E)/\tau_T$. We discuss the implications of both the
narrowness of the permitted range and its approximate coincidence with the
range inferred from observations.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:43:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Shi",
"Jiming",
""
],
[
"Krolik",
"Julian H.",
""
]
] | [
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] |
802.1892 | Dmitry Tsigankov | Dmitry Tsigankov and Alexei Koulakov | Sperry versus Hebb: Topographic mapping in Isl2/EphA3 mutant mice | 13 pages, 6 figures | null | null | null | q-bio.NC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In wild-type mice axons of retinal ganglion cells establish topographically
precise projection to the superior colliculus of the midbrain. This implies
that axons of neighboring retinal ganglion cells project to the proximal
locations in the target. The precision of topographic projection is a result of
combined effects of molecular labels, such as Eph receptors and ephrins, and
correlated electric activity. In the Isl2/EphA3 mutant mice the expression
levels of molecular labels is changed. As a result the topographic projection
is rewired so that the neighborhood relationships between retinal cell axons
are disrupted. Here we argue that the effects of correlated activity presenting
themselves in the form of Hebbian learning rules can facilitate the restoration
of the topographic connectivity even when the molecular labels carry
conflicting instructions. This occurs because the correlations in electric
activity carry information about retinal cells' spatial location that is
independent on molecular labels. We argue therefore that experiments in
Isl2/EphA3 knock-in mice directly test the interaction between effects of
molecular labels and correlated activity during the development of neural
connectivity.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:48:15 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Tsigankov",
"Dmitry",
""
],
[
"Koulakov",
"Alexei",
""
]
] | [
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] |
802.1893 | K Sreeram | K. Sreeram, S. Birenjith and P. Vijay Kumar | Diversity and Degrees of Freedom of Cooperative Wireless Networks | Submitted to International Symposium on Information Theory (ISIT),
2008 | null | null | null | cs.IT math.IT | null | Wireless fading networks with multiple antennas are typically studied
information-theoretically from two different perspectives - the outage
characterization and the ergodic capacity characterization. A key parameter in
the outage characterization of a network is the diversity, whereas a
first-order indicator for the ergodic capacity is the degrees of freedom (DOF),
which is the pre-log coefficient in the capacity expression. In this paper, we
present max-flow min-cut type theorems for computing both the diversity and the
degrees of freedom of arbitrary single-source single-sink multi-antenna
networks. We also show that an amplify-and-forward protocol is sufficient to
achieve this. The degrees of freedom characterization is obtained using a
conversion to a deterministic wireless network for which the capacity was
recently found. We show that the diversity result easily extends to
multi-source multi-sink networks and evaluate the DOF for multi-casting in
single-source multi-sink networks.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 20:52:16 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Sreeram",
"K.",
""
],
[
"Birenjith",
"S.",
""
],
[
"Kumar",
"P. Vijay",
""
]
] | [
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] |
802.1894 | Christian Buth | Emily R. Peterson, Christian Buth, Dohn A. Arms, Robert W. Dunford,
Elliot P. Kanter, Bertold Kr\"assig, Eric C. Landahl, Stephen T. Pratt, Robin
Santra, Stephen H. Southworth, Linda Young | An x-ray probe of laser-aligned molecules | 4 pages, 4 figures, RevTeX4, corrected typos | Appl. Phys. Lett. 92, 094106 (2008) (3 pages), republication in
Virtual Journal of Ultrafast Science 7, issue 4 (2008) | 10.1063/1.2890846 | null | physics.chem-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate a hard x-ray probe of laser-aligned small molecules. To align
small molecules with optical lasers, high intensities at nonresonant
wavelengths are necessary. We use 95 ps pulses focused to 40 mum from an 800 nm
Ti:sapphire laser at a peak intensity of 10^12 W/cm^2 to create an ensemble of
aligned bromotrifluoromethane (CF3Br) molecules. Linearly polarized, 120 ps
x-ray pulses, focused to 10 mum, tuned to the Br 1s --> sigma* pre-edge
resonance at 13.476 keV, probe the ensemble of laser-aligned molecules. The
demonstrated methodology has a variety of applications and can enable ultrafast
imaging of laser-controlled molecular motions with Angstrom-level resolution.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:53:45 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Mar 2008 20:57:08 GMT"
}
] | 2008-05-16T00:00:00 | [
[
"Peterson",
"Emily R.",
""
],
[
"Buth",
"Christian",
""
],
[
"Arms",
"Dohn A.",
""
],
[
"Dunford",
"Robert W.",
""
],
[
"Kanter",
"Elliot P.",
""
],
[
"Krässig",
"Bertold",
""
],
[
"Landahl",
"Eric C.",
""
],
[
"Pratt",
"Stephen T.",
""
],
[
"Santra",
"Robin",
""
],
[
"Southworth",
"Stephen H.",
""
],
[
"Young",
"Linda",
""
]
] | [
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] |
802.1895 | B. Svaiter F. | M. Marques Alves, B. F. Svaiter | Bronsted-Rockafellar property and maximality of monotone operators
representable by convex functions in non-reflexive Banach spaces | extends to non-reflexive Banach space a previous result proved in
reflexive Banach spaces | Journal of Convex Analysis, 15 (2008), No. 4, 693-706. | null | null | math.FA math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we are concerned with maximality of monotone operators
representable by certain convex functions in non-reflexive Banach spaces. We
also prove that these maximal monotone operators satisfy a Bronsted-Rockafellar
type property.
We show that if a function in XxX^* and its conjugate are above the duality
product in their respective domains, then this function represents a maximal
monotone operator.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:57:06 GMT"
}
] | 2009-04-02T00:00:00 | [
[
"Alves",
"M. Marques",
""
],
[
"Svaiter",
"B. F.",
""
]
] | [
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802.1896 | Manuel Lladser | Manuel Lladser | Markovian embeddings of general random strings | Full extended abstract available at
http://www.siam.org/proceedings/analco/2008/analco08.php | 2008 Proceedings of the Fourth Workshop on Analytic Algorithmics
and Combinatorics (ANALCO) | null | null | math.PR math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let A be a finite set and X a sequence of A-valued random variables. We do
not assume any particular correlation structure between these random variables;
in particular, X may be a non-Markovian sequence. An adapted embedding of X is
a sequence of the form R(X_1), R(X_1,X_2), R(X_1,X_2,X_3), etc where R is a
transformation defined over finite length sequences. In this extended abstract
we characterize a wide class of adapted embeddings of X that result in a
first-order homogeneous Markov chain. We show that any transformation R has a
unique coarsest refinement R' in this class such that R'(X_1), R'(X_1,X_2),
R'(X_1,X_2,X_3), etc is Markovian. (By refinement we mean that R'(u)=R'(v)
implies R(u)=R(v), and by coarsest refinement we mean that R' is a
deterministic function of any other refinement of R in our class of
transformations.) We propose a specific embedding that we denote as R^X which
is particularly amenable for analyzing the occurrence of patterns described by
regular expressions in X. A toy example of a non-Markovian sequence of 0's and
1's is analyzed thoroughly: discrete asymptotic distributions are established
for the number of occurrences of a certain regular pattern in X_1,...,X_n, as n
tends to infinity, whereas a Gaussian asymptotic distribution is shown to apply
for another regular pattern.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 19:59:58 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Lladser",
"Manuel",
""
]
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802.1897 | Zakia Hammouch | Zakia Hammouch (LAMFA) | A pseudosimilarity approach to a steady free convection flow | null | null | null | null | physics.class-ph | null | In this communication we deal with the exact solutions called
"pseudosimilarity" of a steady free convection problem studied by by Kumaran
and Pop (2006). They showed that there is no similarity solution for the case
of a wall temperature as $T_{w}(x)\sim x^{-{1/2}}$ (resp. a wall heat flux as
$q_{w}(x)\sim x^{-{3/2}},$ and a dimensionless heat transfer coefficient
$h_{w}(x)\sim x^{-1}$). We shall present some results about existence and
asymptotic behaviour of new exact solutions of the resulting boundary value
problem for each case.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 20:02:35 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Hammouch",
"Zakia",
"",
"LAMFA"
]
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802.1898 | Paulo S\'ergio Rodrigues da Silva | A. Doff, A. A. Natale, P. S. Rodrigues da Silva | Light composite Higgs from an effective action for technicolor | 10 pages, 6 figures. Minor changes on the text, typos corrected and
references added. Matches version to be published in PRD | Phys.Rev.D77:075012,2008 | 10.1103/PhysRevD.77.075012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute an effective action for a composite Higgs boson formed by new
fermions belonging to a general technicolor non-Abelian gauge theory, using a
quite general expression for the fermionic self-energy that depends on a
certain parameter (alpha), that defines the technicolor theory from the extreme
walking behavior up to the one with a standard operator product expansion
behavior. We discuss the values of the trilinear and quadrilinear scalar
couplings. Our calculation spans all the possible physical possibilities for
mass and couplings of the composite system. In the case of extreme walking
technicolor theories we verify that it is possible to have a composite Higgs
boson with a mass as light as the present experimental limit, contrary to the
usual expectation of a heavy mass for the composite Higgs boson. In this case
we obtain an upper limit for the Higgs boson mass, M_H ~ 700GeV for SU(2)_TC,
and the experimental data on the Higgs boson mass constrain SU(N)_TC
technicolor gauge groups to be smaller than SU(10)_TC.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 20:02:58 GMT"
},
{
"version": "v2",
"created": "Mon, 28 Apr 2008 23:17:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Doff",
"A.",
""
],
[
"Natale",
"A. A.",
""
],
[
"da Silva",
"P. S. Rodrigues",
""
]
] | [
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802.1899 | Pierre-Olivier Chapuis | Pierre-Olivier Chapuis, Sebastian Volz (EM2C), Carsten Henkel
(Institut f\"ur Physik), Karl Joulain (LET), Jean-Jacques Greffet (EM2C) | Effects of spatial dispersion in near-field radiative heat transfer
between two parallel metallic surfaces | Version without figures (8 figures in the complete version) | Physical Review B 77, 3 (2008) 035431 | 10.1103/PhysRevB.77.035431 | null | physics.optics cond-mat.other | null | We study the heat transfer between two parallel metallic semi-infinite media
with a gap in the nanometer-scale range. We show that the near-field radiative
heat flux saturates at distances smaller than the metal skin depth when using a
local dielectric constant and investigate the origin of this effect. The effect
of non-local corrections is analysed using the Lindhard-Mermin and
Boltzmann-Mermin models. We find that local and non-local models yield the same
heat fluxes for gaps larger than 2 nm. Finally, we explain the saturation
observed in a recent experiment as a manifestation of the skin depth and show
that heat is mainly dissipated by eddy currents in metallic bodies.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 20:05:51 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Chapuis",
"Pierre-Olivier",
"",
"EM2C"
],
[
"Volz",
"Sebastian",
"",
"EM2C"
],
[
"Henkel",
"Carsten",
"",
"Institut für Physik"
],
[
"Joulain",
"Karl",
"",
"LET"
],
[
"Greffet",
"Jean-Jacques",
"",
"EM2C"
]
] | [
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802.19 | Pierre-Olivier Chapuis | Pierre-Olivier Chapuis, Marine Laroche (EM2C), Sebastian Volz (EM2C),
Jean-Jacques Greffet (EM2C) | Near-field induction heating of metallic nanoparticles due to infrared
magnetic dipole contribution | publi\'e dans Physical Review B 77 (2008), version avant review | Physical Review B 77, 12 (2008) 125402 | 10.1103/PhysRevB.77.125402 | null | cond-mat.other | null | We revisit the electromagnetic heat transfer between a metallic nanoparticle
and a metallic semi-infinite substrate, commonly studied using the electric
dipole approximation. For infrared and microwave frequencies, we find that the
magnetic polarizability of the particle is larger than the electric one. We
also find that the local density of states in the near field is dominated by
the magnetic contribution. As a consequence, the power absorbed by the particle
in the near field is due to dissipation by fluctuating eddy currents. These
results show that a number of near-field effects involving metallic particles
should be affected by the fluctuating magnetic fields.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 20:06:34 GMT"
}
] | 2008-06-10T00:00:00 | [
[
"Chapuis",
"Pierre-Olivier",
"",
"EM2C"
],
[
"Laroche",
"Marine",
"",
"EM2C"
],
[
"Volz",
"Sebastian",
"",
"EM2C"
],
[
"Greffet",
"Jean-Jacques",
"",
"EM2C"
]
] | [
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] |
802.1901 | Frederic Teubert | Monica Pepe Altarelli and Frederic Teubert | B Physics at LHCb | 26 pages, Contribution to "Perspectives on LHC Physics", ed. G.Kane
and A.Pierce | Int.J.Mod.Phys.A23:5117-5136,2008 | 10.1142/S0217751X08042791 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LHCb is a dedicated detector for b physics at the LHC. In this article we
present a concise review of the detector design and performance together with
the main physics goals and their relevance for a precise test of the Standard
Model and search of New Physics beyond it.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 20:07:38 GMT"
},
{
"version": "v2",
"created": "Mon, 7 Apr 2008 13:40:19 GMT"
}
] | 2009-02-11T00:00:00 | [
[
"Altarelli",
"Monica Pepe",
""
],
[
"Teubert",
"Frederic",
""
]
] | [
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802.1902 | Nicolas Vuillerme | Nicolas Vuillerme (TIMC), Nicolas Pinsault (TIMC), Jacques Vaillant
(TIMC) | Postural control during quiet standing following cervical muscular
fatigue: effects of changes in sensory inputs | null | Neuroscience Letters 378, 3 (2005) 135-9 | 10.1016/j.neulet.2004.12.024 | null | q-bio.NC | null | The purpose of the present experiment was to investigate the effects of
cervical muscular fatigue on postural control during quiet standing under
different conditions of reliability and/or availability of somatosensory inputs
from the plantar soles and the ankles and visual information. To this aim, 14
young healthy adults were asked to sway as little as possible in three sensory
conditions (No vision, No vision-Foam support and Vision) executed in two
conditions of No fatigue and Fatigue of the scapula elevator muscles. Centre of
foot pressure (CoP) displacements were recorded using a force platform. Results
showed that (1) the cervical muscular fatigue yielded increased CoP
displacements in the absence of vision, (2) this effect was more accentuated
when somatosensation was degraded by standing on a foam surface and (3) the
availability of vision allowed the individuals to suppress this destabilising
effect. On the whole, these findings not only stress the importance of intact
cervical neuromuscular function on postural control during quiet standing, but
also suggest a reweigthing of sensory cues in balance control following
cervical muscular fatigue by increasing the reliance on the somatosensory
inputs from the plantar soles and the ankles and visual information.
| [
{
"version": "v1",
"created": "Wed, 13 Feb 2008 20:08:49 GMT"
}
] | 2008-02-14T00:00:00 | [
[
"Vuillerme",
"Nicolas",
"",
"TIMC"
],
[
"Pinsault",
"Nicolas",
"",
"TIMC"
],
[
"Vaillant",
"Jacques",
"",
"TIMC"
]
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Subsets and Splits