id stringlengths 9 16 | title stringlengths 1 382 | abstract stringlengths 6 6.09k | categories stringlengths 5 125 |
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0704.0401 | Modelling the Near-IR Spectra of Red Supergiant-dominated Populations | We report on recent progress in the modelling of the near-IR spectra of young
stellar populations, i.e. populations in which red supergiants (RSGs) are
dominant. First, we discuss the determination of fundamental parameters of RSGs
using fits to their near-IR spectra with new PHOENIX model spectra;
RSG-specific surfa... | astro-ph |
0704.0402 | Locating the peaks of least-energy solutions to a quasilinear elliptic
Neumann problem | In this paper we study the shape of least-energy solutions to a singularly
perturbed quasilinear problem with homogeneous Neumann boundary condition. We
use an intrinsic variation method to show that at limit, the global maximum
point of least-energy solutions goes to a point on the boundary faster than the
linear ra... | math.AP |
0704.0403 | Review: Semiconductor Quantum Light Sources | Lasers and LEDs display a statistical distribution in the number of photons
emitted in a given time interval. New applications exploiting the quantum
properties of light require sources for which either individual photons, or
pairs, are generated in a regulated stream. Here we review recent research on
single-photon ... | quant-ph |
0704.0404 | To the origin of the difference of FSI phases in $B\to\pi\pi$ and
$B\to\rho\rho$ decays | The final state interactions (FSI) model in which soft rescattering of low
mass intermediate states dominates is suggested. It explains why the strong
interaction phases are large in the $B_d\to\pi\pi$ channel and are considerably
smaller in the $B_d\to\rho\rho$ one. Direct CP asymmetries of $B_d\to\pi\pi$
decays whi... | hep-ph hep-ex |
0704.0405 | An invariance principle for semimartingale reflecting Brownian motions
in domains with piecewise smooth boundaries | Semimartingale reflecting Brownian motions (SRBMs) living in the closures of
domains with piecewise smooth boundaries are of interest in applied probability
because of their role as heavy traffic approximations for some stochastic
networks. In this paper, assuming certain conditions on the domains and
directions of r... | math.PR |
0704.0406 | Finite Drude weight for 1D low temperature conductors | We apply well established finite temperature Quantum Monte Carlo techniques
to one dimensional Bose systems with soft and hardcore constraint, as well as
to spinless fermion systems. We give clear and robust numerical evidence that,
as expected, no superfluid density for Bosons or Meissner fraction for
fermions. is p... | cond-mat.str-el cond-mat.supr-con |
0704.0407 | Density dependent hadronic models and the relation between neutron stars
and neutron skin thickness | In the present work we investigate the main differences in the lead neutron
skin thickness, binding energy, surface energy and density profiles obtained
with two different density dependent relativistic hadronic models, within the
Thomas-Fermi approximation. We show that the asymmetry parameter for low
momentum trans... | nucl-th |
0704.0408 | Photoconductance of organic single-molecule contacts | We study the dc conductance of organic single-molecule contacts in the
presence of external electromagnetic radiation (photoconductance). In agreement
with previous predictions, we find that the radiation can lead to large
enhancements of the conductance of such contacts by bringing off-resonant
levels into resonance... | cond-mat.mes-hall |
0704.0409 | On the over-barrier reflection in quantum mechanics with multiple
degrees of freedom | We present an analytic example of two dimensional quantum mechanical system,
where the exponential suppression of the probability of over-barrier reflection
changes non-monotonically with energy. The suppression is minimal at certain
"optimal" energies where reflection occurs with exponentially larger
probability tha... | quant-ph hep-th nlin.CD physics.atom-ph physics.chem-ph |
0704.0410 | Cyclotron Resonance study of the electron and hole velocity in graphene
monolayers | We report studies of cyclotron resonance in monolayer graphene. Cyclotron
resonance is detected using the photoconductive response of the sample for
several different Landau level occupancies. The experiments measure an electron
velocity at the K- (Dirac) point of $c_{K}^{*}$ = 1.093 x 10$^{6}$ ms$^{-1}$
and in addit... | cond-mat.mes-hall |
0704.0411 | Molecular circuits based on graphene nano-ribbon junctions | Graphene nano-ribbons junctions based electronic devices are proposed in this
Letter. Non-equilibrium Green function calculations show that nano-ribbon
junctions tailored from single layer graphene with different edge shape and
width can act as metal-semiconductor junctions and quantum dots can be
implemented. In vir... | cond-mat.mes-hall cond-mat.mtrl-sci |
0704.0412 | Unit groups of integral finite group rings with no noncyclic abelian
finite subgroups | It is shown that in the units of augmentation one of an integral group ring
$\mathbb{Z} G$ of a finite group $G$, a noncyclic subgroup of order $p^{2}$,
for some odd prime $p$, exists only if such a subgroup exists in $G$. The
corresponding statement for $p=2$ holds by the Brauer--Suzuki theorem, as
recently observed... | math.RT math.RA |
0704.0413 | Exotic Hadron in Pole-dominated QCD Sum Rules | We study pentaquark $\Theta^{+} (I=0,J=1/2)$ in the QCD sum rules emphasizing
that we can not extract any properties of the pentaquark outside of the Borel
window. To find the appropriate Borel window, we prepare a favorable set up of
the correlators and carry out the operator product expansion up to dimension 15
wit... | hep-ph |
0704.0414 | Leaky modes of a left-handed slab | Using complex plane analysis we show that left-handed slab may support either
leaky slab waves, which are backward because of negative refraction, or leaky
surface waves, which are backward or forward depending on the propagation
direction of the surface wave itself. Moreover, there is a general connection
between th... | physics.optics |
0704.0415 | Coulomb blockade of field emission from nanoscale conductors | Theoretical description of the field emission of electrons from nanoscale
objects weakly coupled to the cathode is presented. It is shown that the field-
emission current increases in a step-like fashion due to single-electron
charging which leads to abrupt changes of the effective electric field
responsible for the ... | cond-mat.mes-hall |
0704.0416 | Origamis with non congruence Veech groups | As main result we show that for each g > 1 there is some translation surface
of genus g whose Veech group is a non congruence subgroup of SL(2,Z). We use
origamis/square-tiled surfaces to produce our examples. The article is divided
into two parts: In the first part we introduce translation surfaces, origamis,
Veech ... | math.GT math.AG |
0704.0417 | Thermodynamic Stability - A note on a footnote in Ruelle's book | Thermodynamic stable interaction pair potentials which are not of the form
``positive function + real continuous function of positive type'' are presented
in dimension one. Construction of such a potential in dimension two is
sketched. These constructions use only elementary calculations. The
mathematical background ... | math-ph math.MP |
0704.0418 | Entanglement entropy at infinite randomness fixed points in higher
dimensions | The entanglement entropy of the two-dimensional random transverse Ising model
is studied with a numerical implementation of the strong disorder
renormalization group. The asymptotic behavior of the entropy per surface area
diverges at, and only at, the quantum phase transition that is governed by an
infinite randomne... | cond-mat.dis-nn quant-ph |
0704.0419 | Ultrasound attenuation of superfluid $^{3}$He in aerogel | We have performed longitudinal ultrasound (9.5 MHz) attenuation measurements
in the B-phase of superfluid $^3$He in 98% porosity aerogel down to the zero
temperature limit for a wide range of pressures at zero magnetic field. The
absolute attenuation was determined by direct transmission of sound pulses.
Compared to ... | cond-mat.supr-con |
0704.0420 | The Hourglass - Consequences of Pure Hamiltonian Evolution of a
Radiating System | Hourglass is the name given here to a formal isolated quantum system that can
radiate. Starting from a time when it defines the system it represents clearly
and no radiation is present, it is given straightforward Hamiltonian evolution.
The question of what significance hourglasses have is raised, and this question
i... | quant-ph |
0704.0421 | The Sigma-D Relation for Planetary Nebulae: Preliminary Analysis | An analysis of the relation between radio surface brightness and diameter,
so-called Sigma-D relation, for planetary nebulae (PNe) is presented: i) the
theoretical Sigma-D relation for the evolution of bremsstrahlung surface
brightness is derived; ii) contrary to the results obtained earlier for the
Galactic supernov... | astro-ph |
0704.0422 | Polarization conversion in a silica microsphere | We experimentally demonstrate controlled polarization-selective phenomena in
a whispering gallery mode resonator. We observed efficient ($\approx 75 %$)
polarization conversion of light in a silica microsphere coupled to a tapered
optical fiber with proper optimization of the polarization of the propagating
light. A ... | physics.optics |
0704.0423 | Limits on WIMP-nucleon interactions with CsI(Tl) crystal detectors | The Korea Invisible Mass Search(KIMS) experiment presents new limits on
WIMP-nucleon cross section using the data from an exposure of 3409 kgd taken
with low background CsI(Tl) crystals at Yangyang underground laboratory. The
most stringent limit on the spin dependent interaction for pure proton case is
obtained. The... | astro-ph |
0704.0424 | Stopping effects in U+U collisions with a beam energy of 520 MeV/nucleon | A Relativistic Transport Model (ART1.0) is applied to simulate the stopping
effects in tip-tip and body-body U+U collisions, at a beam kinetic energy of
520 MeV/nucleon. Our simulation results have demonstrated that both central
collisions of the two extreme orientations can achieve full stopping, and also
form a bul... | nucl-ex |
0704.0425 | QED for fields obeying a square root operator equation | Instead of using local field equations - like the Dirac equation for spin-1/2
and the Klein-Gordon equation for spin-0 particles - one could try to use
non-local field equations in order to describe scattering processes. The latter
equations can be obtained by means of the relativistic energy together with the
corres... | hep-th |
0704.0426 | Feedback from first radiation sources: H- photodissociation | During the epoch of reionization, the formation of radiation sources is
accompanied by the growth of a H- photodissociating flux. We estimate the
impact of this flux on the formation of molecular hydrogen and cooling in the
first galaxies, assuming different types of radiation sources (e.g. Pop II and
Pop III stars, ... | astro-ph |
0704.0427 | The 3D +-J Ising model at the ferromagnetic transition line | We study the critical behavior of the three-dimensional $\pm J$ Ising model
[with a random-exchange probability $P(J_{xy}) = p \delta(J_{xy} - J) + (1-p)
\delta(J_{xy} + J)$] at the transition line between the paramagnetic and
ferromagnetic phase, which extends from $p=1$ to a multicritical (Nishimori)
point at $p=p_... | cond-mat.dis-nn cond-mat.stat-mech |
0704.0428 | Star Formation in the Bok Globule CB54 | We present mid-infrared (10.4 \micron, 11.7 \micron, and 18.3 \micron)
imaging intended to locate and characterize the suspected protostellar
components within the Bok globule CB54. We detect and confirm the protostellar
status for the near-infrared source CB54YC1-II. The mid-infrared luminosity for
CB54YC1-II was fo... | astro-ph |
0704.0429 | Quantitative Resolution to some "Absolute Discrepancies" in Cancer
Theories: a View from Phage lambda Genetic Switch | Is it possible to understand cancer? Or more specifically, is it possible to
understand cancer from genetic side? There already many answers in literature.
The most optimistic one has claimed that it is mission-possible. Duesberg and
his colleagues reviewed the impressive amount of research results on cancer
accumula... | q-bio.SC q-bio.CB |
0704.0430 | Reduced phase space and toric variety coordinatizations of Delzant
spaces | In this note we describe the natural coordinatizations of a Delzant space
defined as a reduced phase space (symplectic geometry view-point) and give
explicit formulas for the coordinate transformations. For each fixed point of
the torus action on the Delzant polytope, we have a maximal coordinatization of
an open cel... | math.SG math.AG |
0704.0431 | Fragmentation of general relativistic quasi-toroidal polytropes | We investigate the role of rotational instabilities in the context of black
hole formation in relativistic stars. In addition to the standard scenario - an
axially symmetric dynamical instability forming a horizon at the star's center
- the recently found low-$T/|W|$ instabilities are shown to lead to
fragmentation a... | gr-qc astro-ph.HE |
0704.0432 | A Survey of Huebschmann and Stasheff's Paper: Formal Solution of the
Master Equation via HPT and Deformation Theory | These notes, based on the paper "Formal Solution of the Master Equation via
HPT and Deformation Theory" by Huebschmann and Stasheff, were prepared for a
series of talks at Illinois State University with the intention of applying
Homological Perturbation Theory to the derived bracket constructions of
Kosmann-Schwarzba... | math.QA |
0704.0433 | A variational formulation of electrodynamics with external sources | We present a variational formulation of electrodynamics using de Rham even
and odd differential forms. Our formulation relies on a variational principle
more complete than the Hamilton principle and thus leads to field equations
with external sources and permits the derivation of the constitutive relations.
We interp... | math-ph math.DG math.MP |
0704.0434 | Protein and ionic surfactants - promoters and inhibitors of contact line
pinning | We report a new effect of surfactants in pinning a drop contact line,
specifically that lysozyme promotes while lauryl sulfate inhibits pinning. We
explain the pinning disparity assuming difference in wetting: the protein-laden
drop wets a "clean" surface and the surfactant-laden drop wets an
auto-precursored surface... | physics.chem-ph physics.flu-dyn |
0704.0435 | Type D Einstein spacetimes in higher dimensions | We show that all static spacetimes in higher dimensions are of Weyl types G,
I_i, D or O. This applies also to stationary spacetimes if additional
conditions are fulfilled, as for most known black hole/ring solutions. (The
conclusions change when the Killing generator becomes null, such as at Killing
horizons.) Next ... | gr-qc hep-th |
0704.0436 | Eigen Equation of the Nonlinear Spinor | How to effectively solve the eigen solutions of the nonlinear spinor field
equation coupling with some other interaction fields is important to understand
the behavior of the elementary particles. In this paper, we derive a simplified
form of the eigen equation of the nonlinear spinor, and then propose a scheme
to so... | physics.gen-ph |
0704.0437 | Measurement of B(D_S^+ --> ell^+ nu) and the Decay Constant f_D_{S^+} | We examine e+e- --> Ds- Ds*+ and Ds*- Ds+ interactions at 4170 MeV using the
CLEO-c detector in order to measure the decay constant fDs+. We use the Ds+ -->
l+ nu channel, where the l+ designates either a mu+ or a tau+, when the tau+
--> pi+ nu. Analyzing both modes independently, we determine B(Ds+ --> mu+ nu)
= (0.... | hep-ex hep-lat hep-ph |
0704.0438 | Broadening the Higgs Boson with Right-Handed Neutrinos and a Higher
Dimension Operator at the Electroweak Scale | The existence of certain TeV suppressed higher-dimension operators may open
up new decay channels for the Higgs boson to decay into lighter right-handed
neutrinos. These channels may dominate over all other channels if the Higgs
boson is light. For a Higgs boson mass larger than $2 m_W$ the new decays are
subdominant... | hep-ph |
0704.0439 | Coulomb blockade of anyons | Coulomb interaction turns anyonic quasiparticles of a primary quantum Hall
liquid with filling factor $\nu =1/(2m+1)$ into hard-core anyons. We have
developed a model of coherent transport of such quasiparticles in systems of
multiple antidots by extending the Wigner-Jordan description of 1D abelian
anyons to tunneli... | cond-mat.mes-hall |
0704.0440 | Dynamics of a quantum phase transition in a ferromagnetic Bose-Einstein
condensate | We discuss dynamics of a slow quantum phase transition in a spin-1
Bose-Einstein condensate. We determine analytically the scaling properties of
the system magnetization and verify them with numerical simulations in a one
dimensional model.
| cond-mat.other hep-th quant-ph |
0704.0441 | Evidence for a planetary companion around a nearby young star | We report evidence for a planetary companion around the nearby young star HD
70573. The star is a G type dwarf located at a distance of 46 pc with age
estimation between 20 and 300 Myrs. We carried out spectroscopic observations
of this star with FEROS at the 2.2 m MPG/ESO telescope at La Silla. Our
spectroscopic ana... | astro-ph |
0704.0442 | Quantum electromagnetic X-waves | We show that two distinct quantum states of the electromagnetic field can be
associated to a classical vector X wave or a propagation-invariant solution of
Maxwell equations. The difference between the two states is of pure quantum
mechanical origin since they are internally entangled and disentangled,
respectively a... | physics.optics physics.gen-ph quant-ph |
0704.0443 | Neutron-neutron scattering length from the reaction gamma d --> pi^+ nn
employing chiral perturbation theory | We discuss the possibility to extract the neutron-neutron scattering length
a_{nn} from experimental spectra on the reaction gamma d --> pi^+ nn. The
transition operator is calculated to high accuracy from chiral perturbation
theory. We argue that for properly chosen kinematics, the theoretical
uncertainty of the met... | nucl-th nucl-ex |
0704.0444 | Multiple Unfoldings of Orbifold Singularities: Engineering Geometric
Analogies to Unification | Katz and Vafa showed how charged matter can arise geometrically by the
deformation of ADE-type orbifold singularities in type IIa, M-theory, and
F-theory compactifications. In this paper we use those same basic ingredients,
used there to geometrically engineer specific matter representations, here to
deform the compa... | hep-th |
0704.0445 | Geometrically Engineering the Standard Model: Locally Unfolding Three
Families out of E8 | This paper extends and builds upon the results of an earlier paper, in which
we described how to use the tools of geometrical engineering to deform
geometrically-engineered grand unified models into ones with lower symmetry.
This top-down unfolding has the advantage that the relative positions of
singularities giving... | hep-th |
0704.0446 | The classification of surfaces with p_g=q=1 isogenous to a product of
curves | A projective surface S is said to be isogenous to a product if there exist
two smooth curves C, F and a finite group G acting freely on C \times F so that
S=(C \times F)/G. In this paper we classify all surfaces with p_g=q=1 which are
isogenous to a product.
| math.AG math.GR |
0704.0447 | Manipulating the rotational properties of a two-component Bose gas | A rotating, two-component Bose-Einstein condensate is shown to exhibit
vortices of multiple quantization, which are possible due to the interatomic
interactions between the two species. Also, persistent currents are absent in
this system. Finally, the order parameter has a very simple structure for a
range of angular... | cond-mat.mes-hall |
0704.0448 | Giant Planet Migration in Viscous Power-Law Discs | Many extra-solar planets discovered over the past decade are gas giants in
tight orbits around their host stars. Due to the difficulties of forming these
`hot Jupiters' in situ, they are generally assumed to have migrated to their
present orbits through interactions with their nascent discs. In this paper, we
present... | astro-ph |
0704.0449 | Worldsheet Instantons and Torsion Curves, Part B: Mirror Symmetry | We apply mirror symmetry to the problem of counting holomorphic rational
curves in a Calabi-Yau threefold X with Z_3 x Z_3 Wilson lines. As we found in
Part A [hep-th/0703182], the integral homology group H_2(X,Z)=Z^3 + Z_3 + Z_3
contains torsion curves. Using the B-model on the mirror of X as well as its
covering sp... | hep-th |
0704.0450 | Disorder screening near the Mott-Anderson transition | Correlation-driven screening of disorder is studied within the typical-medium
dynamical mean-field theory (TMT-DMFT) of the Mott-Anderson transition. In the
strongly correlated regime, the site energies epsilon_R^i characterizing the
effective disorder potential are strongly renormalized due to the phenomenon of
Kond... | cond-mat.str-el |
0704.0451 | Electromigrated nanoscale gaps for surface-enhanced Raman spectroscopy | Single-molecule detection with chemical specificity is a powerful and much
desired tool for biology, chemistry, physics, and sensing technologies.
Surface-enhanced spectroscopies enable single molecule studies, yet reliable
substrates of adequate sensitivity are in short supply. We present a simple,
scaleable substra... | cond-mat.mes-hall |
0704.0452 | Dramatic Variability of X-ray Absorption Lines in the Black Hole
Candidate Cygnus X-1 | We report results from a 30 ks observation of Cygnus X-1 with the High Energy
Transmission Grating Spectrometer (HETGS) on board the {\em Chandra X-ray
Observatory}. Numerous absorption lines were detected in the HETGS spectrum.
The lines are associated with highly ionized Ne, Na, Mg, Al, Si, S, and Fe,
some of which... | astro-ph |
0704.0453 | Antiferromagnetism-superconductivity competition in electron-doped
cuprates triggered by oxygen reduction | We have performed a systematic angle-resolved photoemission study of as-grown
and oxygen-reduced Pr$_{2-x}$Ce$_x$CuO$_4$ and Pr$_{1-x}$LaCe$_{x}$CuO$_4$
electron-doped cuprates. In contrast to the common belief, neither the band
filling nor the band parameters are significantly affected by the oxygen
reduction proces... | cond-mat.supr-con cond-mat.str-el |
0704.0454 | An Extrasolar Planet Census with a Space-based Microlensing Survey | A space-based gravitational microlensing exoplanet survey will provide a
statistical census of exoplanets with masses down to 0.1 Earth-masses and
orbital separations ranging from 0.5AU to infinity. This includes analogs to
all the Solar System's planets except for Mercury, as well as most types of
planets predicted ... | astro-ph |
0704.0455 | USco1606-1935: An Unusually Wide Low-Mass Triple System? | We present photometric, astrometric, and spectroscopic observations of
USco160611.9-193532 AB, a candidate ultrawide (~1600 AU), low-mass (M_tot~0.4
M_sun) multiple system in the nearby OB association Upper Scorpius. We conclude
that both components are young, comoving members of the association; we also
present high... | astro-ph |
0704.0456 | Particle propagation in cosmological backgrounds | We study the quantum propagation of particles in cosmological backgrounds, by
considering a doublet of massive scalar fields propagating in an expanding
universe, possibly filled with radiation. We focus on the dissipative effects
related to the expansion rate. At first order, we recover the expected result
that the ... | gr-qc |
0704.0457 | Quantum analysis of a linear DC SQUID mechanical displacement detector | We provide a quantum analysis of a DC SQUID mechanical displacement detector
within the sub-critical Josephson current regime. A segment of the SQUID loop
forms the mechanical resonator and motion of the latter is transduced
inductively through changes in the flux threading the loop. Expressions are
derived for the d... | cond-mat.supr-con cond-mat.mes-hall quant-ph |
0704.0458 | Rotation Measures of Extragalactic Sources Behind the Southern Galactic
Plane: New Insights into the Large-Scale Magnetic Field of the Inner Milky
Way | We present new Faraday rotation measures (RMs) for 148 extragalactic radio
sources behind the southern Galactic plane (253o < l < 356o, |b| < 1.5o), and
use these data in combination with published data to probe the large-scale
structure of the Milky Way's magnetic field. We show that the magnitudes of
these RMs osci... | astro-ph |
0704.0459 | On iterated image size for point-symmetric relations | Let $\Gamma =(V,E)$ be a point-symmetric reflexive relation and let $v\in V$
such that
$|\Gamma (v)|$ is finite (and hence $|\Gamma (x)|$ is finite for all $x$, by
the transitive action of the group of automorphisms). Let $j\in \N$ be an
integer such that $\Gamma ^j(v)\cap \Gamma ^{-}(v)=\{v\}$. Our main result
sta... | math.CO |
0704.0460 | The Kilodegree Extremely Little Telescope (KELT): A Small Robotic
Telescope for Large-Area Synoptic Surveys | The Kilodegree Extremely Little Telescope (KELT) project is a survey for
planetary transits of bright stars. It consists of a small-aperture, wide-field
automated telescope located at Winer Observatory near Sonoita, Arizona. The
telescope surveys a set of 26 x 26 degree fields, together covering about 25%
of the Nort... | astro-ph |
0704.0461 | Entanglement increase from local interactions with
not-completely-positive maps | Simple examples are constructed that show the entanglement of two qubits
being both increased and decreased by interactions on just one of them. One of
the two qubits interacts with a third qubit, a control, that is never entangled
or correlated with either of the two entangled qubits and is never entangled,
but beco... | quant-ph |
0704.0462 | Extended solar emission - an analysis of the EGRET data | The Sun was recently predicted to be an extended source of gamma-ray
emission, produced by inverse-Compton scattering of cosmic-ray electrons with
the solar radiation. The emission was predicted to contribute to the diffuse
extragalactic background even at large angular distances from the Sun. While
this emission is ... | astro-ph |
0704.0463 | Mass and Temperature of the TWA 7 Debris Disk | We present photometric detections of dust emission at 850 and 450 micron
around the pre-main sequence M1 dwarf TWA 7 using the SCUBA camera on the James
Clerk Maxwell Telescope. These data confirm the presence of a cold dust disk
around TWA 7, a member of the TW Hydrae Association. Based on the 850 micron
flux, we es... | astro-ph |
0704.0464 | Annealed importance sampling of dileucine peptide | Annealed importance sampling is a means to assign equilibrium weights to a
nonequilibrium sample that was generated by a simulated annealing protocol. The
weights may then be used to calculate equilibrium averages, and also serve as
an ``adiabatic signature'' of the chosen cooling schedule. In this paper we
demonstra... | q-bio.BM |
0704.0465 | A General Nonlinear Fokker-Planck Equation and its Associated Entropy | A recently introduced nonlinear Fokker-Planck equation, derived directly from
a master equation, comes out as a very general tool to describe
phenomenologically systems presenting complex behavior, like anomalous
diffusion, in the presence of external forces. Such an equation is
characterized by a nonlinear diffusion... | cond-mat.stat-mech cond-mat.other |
0704.0466 | Conduction electron spin-lattice relaxation time in the MgB2
superconductor | The spin-lattice relaxation time, $T_{1}$, of conduction electrons is
measured as a function of temperature and magnetic field in MgB$_2$. The method
is based on the detection of the $z$ component of the conduction electron
magnetization under electron spin resonance conditions with amplitude modulated
microwave exci... | cond-mat.supr-con cond-mat.str-el |
0704.0467 | Modeling Accretion Disk X-ray Continuum of Black Hole Candidates | We critically examine issues associated with determining the fundamental
properties of the black hole and the surrounding accretion disk in an X-ray
binary based on modeling the disk X-ray continuum of the source. We base our
work mainly on two XMM-Newton observations of GX 339-4, because they provided
high-quality d... | astro-ph |
0704.0468 | Inapproximability of Maximum Weighted Edge Biclique and Its Applications | Given a bipartite graph $G = (V_1,V_2,E)$ where edges take on {\it both}
positive and negative weights from set $\mathcal{S}$, the {\it maximum weighted
edge biclique} problem, or $\mathcal{S}$-MWEB for short, asks to find a
bipartite subgraph whose sum of edge weights is maximized. This problem has
various applicati... | cs.CC cs.DS |
0704.0469 | On line arrangements with applications to 3-nets | We show a one-to-one correspondence between arrangements of d lines in the
projective plane, and lines in P^{d-2}. We apply this correspondence to
classify (3,q)-nets over the complex numbers for all q<=6. When q=6, we have
twelve possible combinatorial cases, but we prove that only nine of them are
realizable. This ... | math.AG math.CO |
0704.0470 | Testing turbulence model at metric scales with mid-infrared VISIR images
at the VLT | We probe turbulence structure from centimetric to metric scales by
simultaneous imagery at mid-infrared and visible wavelengths at the VLT
telescope and show that it departs significantly from the commonly used
Kolmogorov model. The data can be fitted by the von Karman model with an outer
scale of the order of 30 m a... | astro-ph |
0704.0471 | Density dependence of the symmetry energy and the nuclear equation of
state: A Dynamical and Statistical model perspective | The density dependence of the symmetry energy in the equation of state of
isospin asymmetric nuclear matter is of significant importance for studying the
structure of systems as diverse as the neutron-rich nuclei and the neutron
stars. A number of reactions using the dynamical and the statistical models of
multifragm... | nucl-ex nucl-th |
0704.0472 | Competitive nucleation and the Ostwald rule in a generalized Potts model
with multiple metastable phases | We introduce a simple nearest-neighbor spin model with multiple metastable
phases, the number and decay pathways of which are explicitly controlled by the
parameters of the system. With this model we can construct, for example, a
system which evolves through an arbitrarily long succession of metastable
phases. We als... | cond-mat.stat-mech cond-mat.mtrl-sci cond-mat.soft |
0704.0473 | Contrasting Two Transformation-Based Methods for Obtaining Absolute
Extrema | In this note we contrast two transformation-based methods to deduce absolute
extrema and the corresponding extremizers. Unlike variation-based methods, the
transformation-based ones of Carlson and Leitmann and the recent one of Silva
and Torres are direct in that they permit obtaining solutions by inspection.
| math.OC |
0704.0474 | Application of Ewald summations to long-range dispersion forces | We present results illustrating the effects of using explicit summation terms
for the $r^{-6}$ dispersion term on the interfacial properties of a
Lennard-Jones fluid and SPC/E water. For the Lennard-Jones fluid, we find that
the use of long-range summations, even with a short ``crossover radius,''
yields results that... | cond-mat.mtrl-sci cond-mat.stat-mech |
0704.0475 | Possible non-thermal nature of the soft-excess emission in the cluster
of galaxies Sersic 159-03 | We present an analysis of new Suzaku data and archival data from XMM-Newton
of the cluster of galaxies Sersic 159-03, which has a strong soft X-ray excess
emission component. The Suzaku observation confirms the presence of the soft
excess emission, but it does not confirm the presence of redshifted OVII lines
in the ... | astro-ph |
0704.0476 | Geometric phase of an atom inside an adiabatic radio frequency potential | We investigate the geometric phase of an atom inside an adiabatic radio
frequency (rf) potential created from a static magnetic field (B-field) and a
time dependent rf field. The spatial motion of the atomic center of mass is
shown to give rise to a geometric phase, or Berry's phase, to the adiabatically
evolving ato... | quant-ph |
0704.0477 | The Transition from the First Stars to the Second Stars in the Early
Universe | We observe a sharp transition from a singular, high-mass mode of star
formation, to a low-mass dominated mode, in numerical simulations, at a
metallicity of 10^-3 Zsolar. We incorporate a new method for including the
radiative cooling from metals into adaptive mesh-refinement hydrodynamic
simulations. Our results ill... | astro-ph |
0704.0478 | Super Star Cluster Velocity Dispersions and Virial Masses in the M82
Nuclear Starburst | We use high-resolution near-infrared spectroscopy from Keck Observatory to
measure the stellar velocity dispersions of 19 super star clusters (SSCs) in
the nuclear starburst of M82. The clusters have ages on the order of 10 Myr,
which is many times longer than the crossing times implied by their velocity
dispersions ... | astro-ph |
0704.0479 | The affine part of the Picard scheme | We describe the maximal torus and maximal unipotent subgroup of the Picard
variety of a proper scheme over a perfect field.
| math.AG math.KT |
0704.0480 | Enhanced quantum Zeno effect and bunching in the decay of interacting
bosons from an unstable state | paper withdrawn due to the possible error in numerical eigenfunction
calculation
| cond-mat.mes-hall |
0704.0481 | The few scales of nuclei and nuclear matter | The well-known correlations of low-energy three and four-nucleon observables
with a typical three-nucleon scale (e.g., the Tjon line) is extended to light
nuclei and nuclear matter. Evidence for the scaling between light nuclei
binding energies and the triton one are pointed out. We argue that the
saturation energy a... | nucl-th |
0704.0482 | Implementation of holonomic quantum computation through engineering and
manipulating environment | We consider an atom-field coupled system, in which two pairs of four-level
atoms are respectively driven by laser fields and trapped in two distant
cavities that are connected by an optical fiber. First, we show that an
effective squeezing reservoir can be engineered under appropriate conditions.
Then, we show that a... | quant-ph |
0704.0483 | Vortex state in a Fulde-Ferrell-Larkin-Ovchinnikov superconductor based
on the quasiclassical theory | We investigate the vortex state with Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)
modulations suggested for a high field phase of CeCoIn_5. On the basis of the
quasiclassical Eilenberger theory, we calculate the three dimensional structure
of pair potentials, internal magnetic fields, paramagnetic moments, and
electronic ... | cond-mat.supr-con |
0704.0484 | Search for Chaotic Behavior in a Flapping Flag | We measured the correlation of the times between successive flaps of a flag
for a variety of wind speeds and found no evidence of low dimensional chaotic
behavior in the return maps of these times. We instead observed what is best
modeled as random times determined by an exponential distribution. This study
was done ... | physics.ed-ph physics.gen-ph |
0704.0485 | Optimal Shape Design for Stokes Flow Via Minimax Differentiability | This paper is concerned with a shape sensitivity analysis of a viscous
incompressible fluid driven by Stokes equations with nonhomogeneous boundary
condition. The structure of shape gradient with respect to the shape of the
variable domain for a given cost function is established by using the
differentiability of a m... | math.OC |
0704.0486 | Kinematic Decoupling of Globular Clusters with Extended
Horizontal-Branch | About 25% of the Milky Way globular clusters (GCs) exhibit unusually extended
color distribution of stars in the horizontal-branch (HB) phase. This
phenomenon is now best understood as due to the presence of helium enhanced
second generation subpopulations, which has raised a possibility that these
peculiar GCs might... | astro-ph |
0704.0487 | Scalar potential model progress | Because observations of galaxies and clusters have been found inconsistent
with General Relativity (GR), the focus of effort in developing a Scalar
Potential Model (SPM) has been on the examination of galaxies and clusters. The
SPM has been found to be consistent with cluster cellular structure, the flow
of IGM from ... | physics.gen-ph |
0704.0488 | Teleparallel Version of the Stationary Axisymmetric Solutions and their
Energy Contents | This work contains the teleparallel version of the stationary axisymmetric
solutions. We obtain the tetrad and the torsion fields representing these
solutions. The tensor, vector and axial-vector parts of the torsion tensor are
evaluated. It is found that the axial-vector has component only along $\rho$
and $z$ direc... | gr-qc |
0704.0489 | Relativistic treatment in D-dimensions to a spin-zero particle with
noncentral equal scalar and vector ring-shaped Kratzer potential | The Klein-Gordon equation in D-dimensions for a recently proposed Kratzer
potential plus ring-shaped potential is solved analytically by means of the
conventional Nikiforov-Uvarov method. The exact energy bound-states and the
corresponding wave functions of the Klein-Gordon are obtained in the presence
of the noncent... | quant-ph |
0704.0490 | Long Distance Signaling Using Axion-like Particles | The possible existence of axion-like particles could lead to a new type of
long distance communication. In this work, basic antenna concepts are defined
and a Friis-like equation is derived to facilitate long-distance link
calculations. An example calculation is presented showing that communication
over distances of ... | hep-ph astro-ph hep-th |
0704.0491 | Weighted percolation on directed networks | We present an analysis of the percolation transition for general node removal
strategies valid for locally tree-like directed networks. On the basis of
heuristic arguments we predict that, if the probability of removing node $i$ is
$p_i$, the network disintegrates if $p_i$ is such that the largest eigenvalue
of the m... | cond-mat.soft cond-mat.dis-nn |
0704.0492 | Refuting the Pseudo Attack on the REESSE1+ Cryptosystem | We illustrate through example 1 and 2 that the condition at theorem 1 in [8]
dissatisfies necessity, and the converse proposition of fact 1.1 in [8] does
not hold, namely the condition Z/M - L/Ak < 1/(2 Ak^2) is not sufficient for
f(i) + f(j) = f(k). Illuminate through an analysis and ex.3 that there is a
logic error... | cs.CR |
0704.0493 | Phase structure of a surface model on dynamically triangulated spheres
with elastic skeletons | We find three distinct phases; a tubular phase, a planar phase, and the
spherical phase, in a triangulated fluid surface model. It is also found that
these phases are separated by discontinuous transitions. The fluid surface
model is investigated within the framework of the conventional curvature model
by using the c... | cond-mat.stat-mech cond-mat.soft |
0704.0494 | Vortex Dynamics at the Initial Stage of Resistive Transition in
Superconductors with Fractal Cluster Structure | The effect of fractal normal-phase clusters on vortex dynamics in a
percolative superconductor is considered. The superconductor contains
percolative superconducting cluster carrying a transport current and clusters
of a normal phase, acting as pinning centers. A prototype of such a structure
is YBCO film, containing... | cond-mat.supr-con cond-mat.mtrl-sci |
0704.0495 | The Veldkamp Space of Two-Qubits | Given a remarkable representation of the generalized Pauli operators of
two-qubits in terms of the points of the generalized quadrangle of order two,
W(2), it is shown that specific subsets of these operators can also be
associated with the points and lines of the four-dimensional projective space
over the Galois fie... | quant-ph math-ph math.MP |
0704.0496 | Fusion process studied with preequilibrium giant dipole resonance in
time dependent Hartree-Fock theory | The equilibration of macroscopic degrees of freedom during the fusion of
heavy nuclei, like the charge and the shape, are studied in the Time-Dependent
Hartree-Fock theory. The pre-equilibrium Giant Dipole Resonance (GDR) is used
to probe the fusion path. It is shown that such isovector collective state is
excited in... | nucl-th |
0704.0497 | Penalization approach for mixed hyperbolic systems with constant
coefficients satisfying a Uniform Lopatinski Condition | In this paper, we describe a new, systematic and explicit way of
approximating solutions of mixed hyperbolic systems with constant coefficients
satisfying a Uniform Lopatinski Condition via different Penalization
approaches.
| math.AP |
0704.0498 | A unified analysis of the reactor neutrino program towards the
measurement of the theta_13 mixing angle | We present in this article a detailed quantitative discussion of the
measurement of the leptonic mixing angle theta_13 through currently scheduled
reactor neutrino oscillation experiments. We thus focus on Double Chooz (Phase
I & II), Daya Bay (Phase I & II) and RENO experiments. We perform a unified
analysis, includ... | hep-ex |
0704.0499 | Optimal Routing for Decode-and-Forward based Cooperation in Wireless
Networks | We investigate cooperative wireless relay networks in which the nodes can
help each other in data transmission. We study different coding strategies in
the single-source single-destination network with many relay nodes. Given the
myriad of ways in which nodes can cooperate, there is a natural routing
problem, i.e., d... | cs.IT math.IT |
0704.0500 | On the polynomial automorphisms of a group | We prove that if a group is nilpotent (resp. metabelian), then so is the
subgroup of its automorphism group generated by all polynomial automorphisms.
| math.GR |
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