title: Multifractal analysis in a mixed asymptotic framework

abstract:
  Multifractal analysis of multiplicative random cascades is revisited within
the framework of {\em mixed asymptotics}. In this new framework, statistics are
estimated over a sample which size increases as the resolution scale (or the
sampling period) becomes finer. This allows one to continuously interpolate
between the situation where one studies a single cascade sample at arbitrary
fine scales and where at fixed scale, the sample length (number of cascades
realizations) becomes infinite. We show that scaling exponents of ''mixed''
partitions functions i.e., the estimator of the cumulant generating function of
the cascade generator distribution, depends on some ``mixed asymptotic''
exponent $\chi$ respectively above and beyond two critical value $p_\chi^-$ and
$p_\chi^+$. We study the convergence properties of partition functions in mixed
asymtotics regime and establish a central limit theorem. These results are
shown to remain valid within a general wavelet analysis framework. Their
interpretation in terms of Besov frontier are discussed. Moreover, within the
mixed asymptotic framework, we establish a ``box-counting'' multifractal
formalism that can be seen as a rigorous formulation of Mandelbrot's negative
dimension theory. Numerical illustrations of our purpose on specific examples
are also provided.


title:
Fluctuations of correlations and Green's function reconstruction: role
  of scattering

abstract:
  Correlations of ambient seismic or acoustic vibrations are now widely used to
reconstruct the impulse response between two passive receivers as if a source
was placed at one of them. This provides the opportunity to do imaging without
a source, or \textsl{passive imaging}. Applications include terrestrial and
solar seismology, underwater acoustics, and structural health monitoring, to
cite only a few. Nevertheless, for a given set of data, correlations do not
only yield the Green's function between the sensors. They also contain residual
fluctuations that result from an imperfect time or source averaging that might
eventually blur the images. In this article, we propose a heuristic model to
describe the level of fluctuations of the correlations in the case of
non-stationary wavefields, and more particularly in the case of scattering
media. The work includes theoretical derivations and numerical simulations. The
role of multiple scattering is quantitatively evaluated. The level of
fluctuations decreases when the duration and intensity of the diffuse waves
increase. The role of absorption is also discussed: absorption is properly
retrieved by correlation, but the level of fluctuations is greater, thus
degrading the Green's function reconstruction. Discrepancies of our simple
model in the case of strong multiple scattering ($k\ell^*\leq 18$) are
discussed.


title:
Turbulent Mixing in the Interstellar Medium -- an application for
  Lagrangian Tracer Particles

abstract:
  We use 3-dimensional numerical simulations of self-gravitating compressible
turbulent gas in combination with Lagrangian tracer particles to investigate
the mixing process of molecular hydrogen (H2) in interstellar clouds. Tracer
particles are used to represent shock-compressed dense gas, which is associated
with H2. We deposit tracer particles in regions of density contrast in excess
of ten times the mean density. Following their trajectories and using
probability distribution functions, we find an upper limit for the mixing
timescale of H2, which is of order 0.3 Myr. This is significantly smaller than
the lifetime of molecular clouds, which demonstrates the importance of the
turbulent mixing of H2 as a preliminary stage to star formation.


title: Flatness of the Energy Landscape for Horn Clauses

abstract:
  The Little-Hopfield neural network programmed with Horn clauses is studied.
We argue that the energy landscape of the system, corresponding to the
inconsistency function for logical interpretations of the sets of Horn clauses,
has minimal ruggedness. This is supported by computer simulations.


title: Minimal gauging of Dirac, Kahler, and Dirac-Kahler spinors

abstract: This paper has been withdrawn by the author.


title: Unparticle Effects on Unitarity Constraints from Higgs Boson Scattering

abstract:
  We study the effects of two-body Higgs boson scattering by exchanging
unpsrticles. The unparticle contribution can change the standard model
prediction for two-body Higgs boson scattering partial wave amplitude
significantly leading to modification of the unitarity constraint on the
standard model Higgs boson mass. For unparticle dimension $d_\U$ between 1 and
2, the unitarity constraint on Higgs boson mass can be larger than that in the
SM. Information on unparticle interaction can also be obtained.


title:
(m,k)-firm constraints and DBP scheduling: impact of the initial
  k-sequence and exact schedulability test

abstract:
  In this paper we study the scheduling of (m,k)-firm synchronous periodic task
systems using the Distance Based Priority (DBP) scheduler. We first show three
phenomena: (i) choosing, for each task, the initial k-sequence 1^k is not
optimal, (ii) we can even start the scheduling from a (fictive) error state (in
regard to the initial k-sequence) and (iii) the period of feasible
DBP-schedules is not necessarily the task hyper-period. We then show that any
feasible DBP-schedule is periodic and we upper-bound the length of that period.
Lastly, based on our periodicity result we provide an exact schedulability
test.


title:
Bayesian Strong Gravitational-Lens Modeling on Adaptive Grids: Objective
  Detection of Mass Substructure in Galaxies

abstract:
  We introduce a new adaptive and fully Bayesian grid-based method to model
strong gravitational lenses with extended images. The primary goal of this
method is to quantify the level of luminous and dark-mass substructure in
massive galaxies, through their effect on highly-magnified arcs and Einstein
rings. The method is adaptive on the source plane, where a Delaunay
tessellation is defined according to the lens mapping of a regular grid onto
the source plane. The Bayesian penalty function allows us to recover the best
non-linear potential-model parameters and/or a grid-based potential correction
and to objectively quantify the level of regularization for both the source and
the potential. In addition, we implement a Nested-Sampling technique to
quantify the errors on all non-linear mass model parameters -- ... -- and allow
an objective ranking of different potential models in terms of the marginalized
evidence. In particular, we are interested in comparing very smooth lens mass
models with ones that contain mass-substructures. The algorithm has been tested
on a range of simulated data sets, created from a model of a realistic lens
system. One of the lens systems is characterized by a smooth potential with a
power-law density profile, twelve include a NFW dark-matter substructure of
different masses and at different positions and one contains two NFW dark
substructures with the same mass but with different positions. Reconstruction
of the source and of the lens potential for all of these systems shows the
method is able, in a realistic scenario, to identify perturbations with masses
>=10^7 solar mass when located on the Einstein ring. For positions both inside
and outside of the ring, masses of at least 10^9 solar mass are required (...).


title: A Pseudo-Boolean Solution to the Maximum Quartet Consistency Problem

abstract:
  Determining the evolutionary history of a given biological data is an
important task in biological sciences. Given a set of quartet topologies over a
set of taxa, the Maximum Quartet Consistency (MQC) problem consists of
computing a global phylogeny that satisfies the maximum number of quartets. A
number of solutions have been proposed for the MQC problem, including Dynamic
Programming, Constraint Programming, and more recently Answer Set Programming
(ASP). ASP is currently the most efficient approach for optimally solving the
MQC problem. This paper proposes encoding the MQC problem with pseudo-Boolean
(PB) constraints. The use of PB allows solving the MQC problem with efficient
PB solvers, and also allows considering different modeling approaches for the
MQC problem. Initial results are promising, and suggest that PB can be an
effective alternative for solving the MQC problem.


title:
Nearing 11d Extremal Intersecting Giants and New Decoupled Sectors in D
  = 3,6 SCFT's

abstract:
  We extend the analysis of arXiv:0801.4457 [hep-th] to charged black hole
solutions of four-dimensional $U(1)^4$ gauged supergravity which carry three
charges. There are two decoupling near-horizon limits, one over the near-BPS
black hole solution and the other over the near-extremal, but non-BPS geometry.
Taking the limit over the eleven dimensional uplift of these black hole
solutions, for both of these cases we obtain a geometry which has a piece
(conformal) to rotating BTZ $\times S^2$. We study the 4d, $11d$ and $5d, 3d$
black hole properties. Moreover, we show that the BTZ$\times S^2$ geometry
obtained after the near-BPS (near-extremal) limit is also a solution to
five-dimensional $U(1)^3$ un-gauged (gauged) STU supergravity. Based on these
decoupling limits we argue that there should be sectors of 3d CFT resulting
from low energy limit of theory on $N$ M2-branes ($N\to \infty)$, which are
decoupled from the rest of the theory and are effectively described by a 2d
CFT. The central charge of the 2d CFT in both near-BPS and near-extremal case
scales as $N$. The engineering dimension of the operators in these decoupled
sectors scales as $N^{4/3}$ (for near-BPS case) while as $N^{3/2}$ (for the
near-extremal case). Moreover, we discuss the description of the decoupled
sectors as certain deformations of $6d$ CFT residing on the intersecting
M5-brane giants.


title: The MAPPINGS III Library of Fast Radiative Shock Models

abstract:
  We present a new library of fully-radiative shock models calculated with the
MAPPINGS III shock and photoionization code. The library consists of grids of
models with shock velocities in the range v=100-1000 km/s and magnetic
parameters B/sqrt(n) of 10^-4 - 10 muG cm^(3/2) for five different atomic
abundance sets, and for a pre-shock density of 1.0 cm^(-3). Additionally, Solar
abundance model grids have been calculated for densities of 0.01, 0.1, 10, 100,
and 1000 cm^(-3) with the same range in v and B/sqrt(n). Each model includes
components of both the radiative shock and its photoionized precursor, ionized
by the EUV and soft X-ray radiation generated in the radiative gas. We present
the details of the ionization structure, the column densities, and the
luminosities of the shock and its precursor. Emission line ratio predictions
are separately given for the shock and its precursor as well as for the
composite shock+precursor structure to facilitate comparison with observations
in cases where the shock and its precursor are not resolved. Emission line
ratio grids for shock and shock+precursor are presented on standard line ratio
diagnostic diagrams, and we compare these grids to observations of radio
galaxies and a sample of AGN and star forming galaxies from the Sloan Digital
Sky Survey. This library is available online, along with a suite of tools to
enable the analysis of the shocks and the easy creation of emission line ratio
diagnostic diagrams. These models represent a significant increase in parameter
space coverage over previously available models, and therefore provide a unique
tool in the diagnosis of emission by shocks.


title: On the equipartition of energy for critical NLW

abstract:
  We study some qualitative properties of global solutions to the following
focusing and defocusing critical $NLW$: \begin{equation*} \Box u+ \lambda
u|u|^{2^*-2}=0, \hbox{} \lambda\in {\mathbf R} \end{equation*} $$\hspace{2cm}
u(0)=f\in \dot H^1({\mathbf R}^n), \partial_t u(0)=g\in L^2({\mathbf R}^n)$$ on
${\mathbf R}\times {\mathbf R}^n$ for $n\geq 3$, where $2^*\equiv
\frac{2n}{n-2}$. We will consider the global solutions of the defocusing $NLW$
whose existence and scattering property is shown in \cite{shst}, \cite{sb} and
\cite{bg}, without any restriction on the initial data $(f,g)\in \dot
H^1({\mathbf R}^n) \times L^2({\mathbf R}^n)$. As well as the solutions
constructed in \cite{pecher} to the focusing $NLW$ for small initial data and
to the ones obtained in \cite{mk}, where a sharp condition on the smallness of
the initial data is given. We prove that the solution $u(t, x)$ satisfies a
family of identities, that turn out to be a precised version of the classical
Morawetz estimates (see \cite{mor1}). As a by--product we deduce that any
global solution to critical $NLW$ belonging to a natural functional space
satisfies: $$\lim_{R\to \infty}\frac 1R \int_{\mathbf R} \int_{|x|<R}
|\nabla_{x} u(t,x)|^2 \hbox{} dxdt $$ $$=\lim_{R\to \infty} \frac 1{2R}
\int_{\mathbf R} \int_{|x|<R} (|\nabla_{t,x} u(t,x)|^2 + \frac{2 \lambda}{2^*}
|u(t,x)|^{2^*}) \hbox{} dxdt$$ $$=\int_{{\mathbf R}^n} (|\nabla_{t, x} u(0,
x)|^2+ \frac{2 \lambda}{2^*} |u(0, x)|^{2^*}) \hbox{} dx.$$


title: Painleve-Gullstrand Coordinates for the Kerr Solution

abstract:
  We construct a coordinate system for the Kerr solution, based on the zero
angular momentum observers dropped from infinity, which generalizes the
Painleve-Gullstrand coordinate system for the Schwarzschild solution. The Kerr
metric can then be interpreted as describing space flowing on a (curved)
Riemannian 3-manifold. The stationary limit arises as the set of points on this
manifold where the speed of the flow equals the speed of light, and the
horizons as the set of points where the radial speed equals the speed of light.
A deeper analysis of what is meant by the flow of space reveals that the
acceleration of free-falling objects is generally not in the direction of this
flow. Finally, we compare the new coordinate system with the closely related
Doran coordinate system.


title: (Non-)Abelian discrete anomalies

abstract:
  We derive anomaly constraints for Abelian and non-Abelian discrete symmetries
using the path integral approach. We survey anomalies of discrete symmetries in
heterotic orbifolds and find a new relation between such anomalies and the
so-called `anomalous' U(1).


title: Polymer Parametrised Field Theory

abstract:
  Free scalar field theory on 2 dimensional flat spacetime, cast in
diffeomorphism invariant guise by treating the inertial coordinates of the
spacetime as dynamical variables, is quantized using LQG type `polymer'
representations for the matter field and the inertial variables. The quantum
constraints are solved via group averaging techniques and, analogous to the
case of spatial geometry in LQG, the smooth (flat) spacetime geometry is
replaced by a discrete quantum structure. An overcomplete set of Dirac
observables, consisting of (a) (exponentials of) the standard free scalar field
creation- annihilation modes and (b) canonical transformations corresponding to
conformal isometries, are represented as operators on the physical Hilbert
space. None of these constructions suffer from any of the `triangulation'
dependent choices which arise in treatments of LQG. In contrast to the standard
Fock quantization, the non- Fock nature of the representation ensures that the
algebra of conformal isometries as well as that of spacetime diffeomorphisms
are represented in an anomaly free manner. Semiclassical states can be analysed
at the gauge invariant level. It is shown that `physical weaves' necessarily
underly such states and that such states display semiclassicality with respect
to, at most, a countable subset of the (uncountably large) set of observables
of type (a). The model thus offers a fertile testing ground for proposed
definitions of quantum dynamics as well as semiclassical states in LQG.


title:
Application of topological radicals to calculation of joint spectral
  radii

abstract:
  It is shown that the joint spectral radius $\rho(M)$ of a precompact family
$M$ of operators on a Banach space $X$ is equal to the maximum of two numbers:
the joint spectral radius $\rho_{e}(M)$ of the image of $M$ in the Calkin
algebra and the Berger-Wang radius $r(M)$ defined by the formula \[
r(M)=\underset{n\to\infty}{\limsup}(\sup\left\{\rho(a):a\in M^{n}\right\}
^{1/n}) . \] Some more general Banach-algebraic results of this kind are also
proved. The proofs are based on the study of special radicals on the class of
Banach algebras.


title: The Auslander-Reiten conjecture for Gorenstein rings

abstract:
  The Nakayama conjecture is one of the most important conjectures in ring
theory. The Auslander-Reiten conjecture is closely related to it. The purpose
of this note is to show that if the Auslander-Reiten conjecture holds in
codimension one for a commutative Gorenstein ring $R$, then it holds for $R$.


title: One-vortex moduli space and Ricci flow

abstract:
  The metric on the moduli space of one abelian Higgs vortex on a surface has a
natural geometrical evolution as the Bradlow parameter, which determines the
vortex size, varies. It is shown by various arguments, and by calculations in
special cases, that this geometrical flow has many similarities to Ricci flow.


title:
Band Offsets at the Si/SiO$_2$ Interface from Many-Body Perturbation
  Theory

abstract:
  We use many-body perturbation theory, the state-of-the-art method for band
gap calculations, to compute the band offsets at the Si/SiO$_2$ interface. We
examine the adequacy of the usual approximations in this context. We show that
(i) the separate treatment of band-structure and potential lineup
contributions, the latter being evaluated within density-functional theory, is
justified, (ii) most plasmon-pole models lead to inaccuracies in the absolute
quasiparticle corrections, (iii) vertex corrections can be neglected, (iv)
eigenenergy self-consistency is adequate. Our theoretical offsets agree with
the experimental ones within 0.3 eV.


title:
The polarizability of the pion: no conflict between dispersion theory
  and chiral perturbation theory

abstract:
  Recent attempts to determine the pion polarizability by dispersion relations
yield values that disagree with the predictions of chiral perturbation theory.
These dispersion relations are based on specific forms for the absorptive part
of the Compton amplitudes. The analytic properties of these forms are examined,
and the strong enhancement of intermediate-meson contributions is shown to be
connected with spurious singularities. If the basic requirements of dispersion
relations are taken into account, the results of dispersion theory and
effective field theory are not inconsistent.


title:
One-step atmospheric pressure synthesis of the ground state of Fe based
  LaFeAsO1-d superconductor

abstract:
  We report an easy and versatile one-step route of synthesis for newly
discovered Fe based superconductor LaFeAsO1-d with d = 0.0 to 0.15. Instead of
widely used high-pressure-high-temperature (HPHT) synthesis, we applied the
normal atmosphere solid-state reaction route. The stoichiometric mixtures of
Fe, La2O3, La and As in ratio LaFeAsO1-d with d = 0.0 to 0.15 are sealed in an
evacuated quartz tube and further heated at 500, 850 and 1100 0C in Ar for 12,
12 and 33 hours respectively in a single step. The resulting compounds are
single phase LaFeAsO crystallized in tetragonal P4/nmm structure. These samples
showed the ground state spin density wave (SDW) like metallic behavior below
around 150 K. In conclusion the ground state of newly discovered Fe based
superconductor is synthesized via an easy one-step solid-state reaction route.


title: A Self-organized model for network evolution

abstract:
  Here we provide a detailed analysis, along with some extensions and additonal
investigations, of a recently proposed self-organised model for the evolution
of complex networks. Vertices of the network are characterised by a fitness
variable evolving through an extremal dynamics process, as in the Bak-Sneppen
model representing a prototype of Self-Organized Criticality. The network
topology is in turn shaped by the fitness variable itself, as in the fitness
network model. The system self-organizes to a nontrivial state, characterized
by a power-law decay of dynamical and topological quantities above a critical
threshold. The interplay between topology and dynamics in the system is the key
ingredient leading to an unexpected behaviour of these quantities.

categories: physics.soc-ph cond-mat.dis-nn cond-mat.stat-mech nlin.AO


title: Parton showers with quantum interference: leading color, with spin

abstract:
  We have previously described a mathematical formulation for a parton shower
based on the approximation of strongly ordered virtualities of successive
parton splittings. Quantum interference, including interference among different
color and spin states, was included. A practical numerical implementation
strategy was left unspecified. In a subsequent paper, we showed that if we add
the further approximations of taking only the leading color limit and averaging
over spins, we obtain a shower evolution that can be implemented as a Markov
process. In this paper, we outline a strategy for including the correlations
induced by parton spins.


title:
Why Einstein, Podolsky and Rosen did not prove that quantum mechanics is
  `incomplete'

abstract:
  It is shown that the Einstein-Podolsky-Rosen conclusion concerning the
`incompleteness' of Quantum Mechanics is invalidated by two logical errors in
their argument. If it were possible to perform the proposed gedanken experiment
it would, in fact, show that Quantum Mechanics is `complete' for the
observables discussed. Because, however, of the non square-integrable nature of
the wave function, the proposed experiment gives vanishing probabilities for
measurements performed in finite intervals of configuration or momentum space.
Hence no conclusion as to the `completeness', or otherwise, of Quantum
Mechanics can be drawn from the experiment.


title: Time-dependent DMRG Study on Quantum Dot under a Finite Bias Voltage

abstract:
  Resonant tunneling through quantum dot under a finite bias voltage at zero
temperature is investigated by using the adaptive time-dependent density matrix
renormalization group(TdDMRG) method. Quantum dot is modeled by the Anderson
Hamiltonian with the 1-D nearest-neighbor tight-binding leads. Initially the
ground state wave function is calculated with the usual DMRG method. Then the
time evolution of the wave function due to the slowly changing bias voltage
between the two leads is calculated by using the TdDMRG technique. Even though
the system size is finite, the expectation values of current operator show
steady-like behavior for a finite time interval, in which the system is
expected to resemble the real nonequilibrium steady state of the infinitely
long system. We show that from the time intervals one can obtain quantitatively
correct results for differential conductance in a wide range of bias voltage.
Finally we observe an anomalous behavior in the expectation value of the double
occupation operator at the dot $<n_{\uparrow} n_{\downarrow}>$ as a function of
bias voltage.


title:
Kinematics and Stellar Populations of Low-Luminosity Early-Type Galaxies
  in the Abell 496 Cluster

abstract:
  The morphology and stellar populations of low-luminosity early-type galaxies
in clusters have until now been limited to a few relatively nearby clusters
such as Virgo or Fornax. Scenarii for the formation and evolution of dwarf
galaxies in clusters are therefore not well constrained. We investigate here
the morphology and stellar populations of low-luminosity galaxies in the
relaxed cluster Abell 496 (z=0.0330). Deep multiband imaging obtained with the
CFHT Megacam allowed us to select a sample of faint galaxies (-18.8<M_B<-15.1
mag). We observed 118 galaxies spectroscopically with the ESO VLT
FLAMES/Giraffe spectrograph (R=6300). We present structural analysis and colour
maps for the 48 galaxies belonging to the cluster. We fit the spectra of 46
objects with PEGASE.HR synthetic spectra to estimate the ages, metallicities,
and velocity dispersions. We computed values of $\alpha$/Fe abundance ratios
from the measurements of Lick indices. High-precision estimates of stellar
population properties have been obtained for a large sample of faint galaxies
in a cluster, allowing for the extension of relations between stellar
populations and internal kinematics to the low-velocity dispersion regime. We
have revealed a peculiar population of elliptical galaxies in the core of the
cluster, resembling massive early-type galaxies by their stellar population
properties and velocity dispersions, but having luminosities of about 2 mag
fainter. External mechanisms of gas removal (ram pressure stripping and
gravitational harassment) are more likely to have occurred than internal
mechanisms such as supernova-driven winds. The violent tidal stripping of
intermediate-luminosity, early-type galaxies in the cluster core can explain
the properties of the peculiar elliptical galaxies surrounding the cD galaxy.


title: Random very loose packs

abstract:
  We measure the number Omega(phi) of mechanically stable states of volume
fraction phi of a granular assembly under gravity. The granular entropy S(phi)
= log Omega(phi) vanishes both at high density, at phi = phi_rcp, and a low
density, at phi = phi_rvlp, where phi_rvlp is a new lower bound we call random
very loose pack. phi_rlp is the volume fraction where the entropy is maximal.
These findings allow for a clear explanation of compaction experiments, and
provide the first first-principle definition of the random loose volume
fraction. In the context of the statistical mechanics approach to static
granular materials, states with phi < phi_rlp are characterized by a negative
temperature.


title: Sonnenstrom aus Plastik

abstract:
  Inspired by the success of organic light emitting diodes, organic solar cells
have the potential to establish interesting applications, complementing and
enhancing the application range of inorganic systems.
  -----
  Durch den Erfolg organischer Leuchtdioden befl\"ugelt, entwickeln sich auch
organische Solarzellen zu interessanten Anwendungen, welche das Potential
haben, die Anwendungsbereiche anorganischer Systeme zu erg\"anzen und
erweitern.


title: On the morphology of sigma-drop galaxies

abstract:
  Context: Local reductions of the stellar velocity dispersion in the central
regions of galaxies are known as sigma-drops. Knowing the origin of these
features can lead to better understanding of inner galactic dynamics.
  Aims: We present a sample of 20 sigma-drop galaxies matched with a control
sample of galaxies without sigma-drop in order to search for correlations
between sigma-drops and the properties, primarily morphological, of the nuclear
zones and discs of their host galaxies.
  Methods: We study the dust and Halpha distribution at 0.1 arcsec scale, using
Hubble Space Telescope imaging, in the circumnuclear zones of the two samples
of galaxies, searching for differences and trying to establish a link between
the nuclear kinematics and the host morphology. We have also considered the CO
and HI emission of the galaxies and their luminosity profiles.
  Results: We classify the two samples following both morphological parameters
and the luminosity profiles. We find a larger fraction of nuclear dust spirals
and Halpha rings in the sigma-drop sample. We also find that the fraction of
Seyfert galaxies in the sigma-drop sample is bigger than that of LINERs and
that the reverse is true for the control sample.
  Conclusions: Our findings are evidence that a $\sigma$-drop is very probably
due to inflow-induced star formation in a dynamically cool disc, or in a gas
ring, shock focused by an inner Lindblad resonance above a certain critical
density level. The same mechanism that feeds the nuclear ring or the nuclear
disc is probably reponsible for the higher rate of Seyfert galaxies among the
$\sigma$-drop hosts.


title: Low energy defibrillation in human cardiac tissue: a simulation study

abstract:
  We aim to assess the effectiveness of feedback controlled resonant drift
pacing as a method for low energy defibrillation. Antitachycardia pacing is the
only low energy defibrillation approach to have gained clinical significance,
but it is still suboptimal. Low energy defibrillation would avoid adverse side
effects associated with high voltage shocks and allow the application of ICD
therapy where it is not tolerated today. We present results of computer
simulations of a bidomain model of cardiac tissue with human atrial ionic
kinetics. Re-entry was initiated and low energy shocks were applied with the
same period as the re-entry, using feedback to maintain resonance. We
demonstrate that such stimulation can move the core of re-entrant patterns, in
the direction depending on location of electrodes and a time delay in the
feedback. Termination of re-entry is achieved with shock strength one order of
magnitude weaker than in conventional single-shock defibrillation. We conclude
that resonant drift pacing can terminate re-entry at a fraction of the shock
strength currently used for defibrillation and can potentially work where
antitachycardia pacing fails, due to the feedback mechanisms. Success depends
on a number of details which these numerical simulations have uncovered.
\emph{Keywords} Re-entry; Bidomain model; Resonant drift; ICD; Defibrillation;
Antitachycardia pacing; Feedback.


title: A theory of quantum electrodynamics with nonlocal interaction

abstract:
  In this paper, we present a theory of quantum electrodynamics with nonlocal
interaction, a main characteristic of the theory is that a charged particle
situated x^{mu} interacts with electromagnetic field situated y^{mu}, where
x^{mu}=y^{mu}+aA^{mu}, A^{mu} reads electromagnetic 4-potential, a is a
constant. All the action, the equations of motion of charged particle and
electromagnetic field are given. For the case of free fields, charged particle
and electromagnetic field obey the Dirac equation and the Maxwell equation of
free fields, respectively; for the case with interaction, both the equations of
motion of charged particle and electromagnetic field lead to current
conservation j^{mu}_{,mu}=0 naturally. The theory is Lorentz invariant and
gauge invariant under a generalized gauge transformation, the generalized gauge
transformation can guarantee that the temporal gauge condition A^{0} holds or
the Lorentz gauge condition A^{mu}_{,mu}=0 holds, respectively. The theory
returns to the current QED when a=0. Finally, taking advantage of the
Lehmann-Symanzik-Zimmermann approach, we establish the corresponding quantum
theory.


title: 500-th solution of 2D Ising model

abstract: One more solution of 2D Ising model is found


title: Size Dependent Phase Transitions

abstract:
  The contributions of heat and work in generating a new surface area are
considered. Unlike the classical theory of vapor/droplet equilibrium, which
associates changing surface areas with work done against the surface tension,
an alternative approach assumes that the droplets grow due to a controllable
condensation of vapor and the internal energy of droplets changes due to the
heat of the phase transition, and not due to the mechanical work. The effect of
radii on the internal energy is discussed. The theory of the vapor/droplet
equilibrium is constructed on the basis of the fundamental Clapeyron equation.
When droplet radii exceed about 50 Lennard-Jones' molecular diameters, the
classical and new models yield similar values of thermodynamic parameters, but
differ essentially in the range of the finest clusters and nanocapillaries. In
contrast to the Kelvin equation, which is not applicable for adsorption in
micropores with radii less than 1 nm and fails in its description of hysteresis
loops in mesopores, the present approach is in reasonably good agreement with
observations; the model gives rational explanations to the mechanism of a
droplet growth and critical parameters of nucleation.


title: One-dimensional phase transitions in a two-dimensional optical lattice

abstract:
  A phase transition for bosonic atoms in a two-dimensional anisotropic optical
lattice is considered. If the tunnelling rates in two directions are different,
the system can undergo a transition between a two-dimensional superfluid and a
one-dimensional Mott insulating array of strongly coupled tubes. The connection
to other lattice models is exploited in order to better understand the phase
transition. Critical properties are obtained using quantum Monte Carlo
calculations. These critical properties are related to correlation properties
of the bosons and a criterion for commensurate filling is established.


title:
Evaluation for moments of a ratio with application to regression
  estimation

abstract:
  Ratios of random variables often appear in probability and statistical
applications. We aim to approximate the moments of such ratios under several
dependence assumptions. Extending the ideas in Collomb [C. R. Acad. Sci. Paris
285 (1977) 289--292], we propose sharper bounds for the moments of randomly
weighted sums and for the $L^p$-deviations from the asymptotic normal law when
the central limit theorem holds. We indicate suitable applications in finance
and censored data analysis and focus on the applications in the field of
functional estimation.


title: Fermi at Los Alamos and the early Britain's way to nuclear energy

abstract:
  A novel recovery of some important documents related to the Fermi course on
neutron physics, held at Los Alamos in 1945, is announced. Its relevance for
the effective launch of a British nuclear programme in the early postwar
period, independently of the U.S. technical cooperation (precluded by the
American authorities) and warmly supported by Chadwick, is discussed.

categories: physics.hist-ph hep-ph nucl-ex nucl-th physics.pop-ph physics.soc-ph


title: AB Electronic Tubes and Quasi-Superconductivity at Room Temperature

abstract:
  Author offers and researches a new idea - filling tubes by electronic gases.
He shows: If the insulating envelope (cover) of the tube is charged positively,
the electrons within the tube are not attracted to covering. Tube (as a whole)
remains a neutral (uncharged) body. The electron gas in the tube has very low
density and very high conductivity, close to superconductivity. If we take the
density (pressure) of electron gas as equal to atmospheric pressure, the
thickness of insulator film may be very small and the resulting tube is very
light.
  Author shows the offered tubes can be applied to many technical fields. For
example: (1) Transfer of energy over very long distance with very small
electric losses. (2) Design of cheap high altitude electric lines without
masts. (3) Transfer of energy from one continent to another continent through
the ionosphere. (4) Transfer of a plasma beam (which can convey thrust and
energy) from Earth surface to a space ship. (5) Observation of the sky by
telescope without atmospheric hindrances. (6) Dirigibles (air balloons) of the
highest lift force. (7) Increasing of gun range severalfold. (8) Transfer of
matter. And so on.
  Key words: AB tubes, electronic tubes, superconductivity, transmission
energy.


title: CMA-ES with Two-Point Step-Size Adaptation

abstract:
  We combine a refined version of two-point step-size adaptation with the
covariance matrix adaptation evolution strategy (CMA-ES). Additionally, we
suggest polished formulae for the learning rate of the covariance matrix and
the recombination weights. In contrast to cumulative step-size adaptation or to
the 1/5-th success rule, the refined two-point adaptation (TPA) does not rely
on any internal model of optimality. In contrast to conventional
self-adaptation, the TPA will achieve a better target step-size in particular
with large populations. The disadvantage of TPA is that it relies on two
additional objective function


title: Topological chaos: what may this mean ?

abstract:
  We confront existing definitions of chaos with the state of the art in
topological dynamics. The article does not propose any new definition of chaos
but, starting from several topological properties that can be reasonably called
chaotic, tries to sketch a theoretical view of chaos. Among the main ideas in
this article are the distinction between overall chaos and partial chaos, and
the fact that some dynamical properties may be considered more chaotic than
others.


title:
Possible Method for Measuring the Proton Form Factors in Processes with
  and without Proton Spin Flip

abstract:
  The ratio of the squares of the electric and magnetic proton form factors is
shown to be proportional to the ratio of the cross sections for the elastic
scattering of an unpolarized electron on a partially polarized proton with and
without proton spin flip. The initial proton at rest should be polarized along
the direction of the motion of the final proton. Similar results are valid for
both radiative $ep$ scattering and the photoproduction of pairs on a proton in
the Bethe--Heitler kinematics. When the initial proton is fully polarized in
the direction of the motion of the final proton, the cross section for the $ep
\to ep$ process, as well as for the $ep \to ep \gamma$ and $\gamma p \to e \bar
e p$ processes, without (with) proton spin flip is expressed only in terms of
the square of the electric (magnetic) proton form factor. Such an experiment on
the measurement of the cross sections without and with proton spin flip would
make it possible to acquire new independent data on the behavior of
$G_E^2(Q^2)$ and $G_M^2(Q^2)$, which are necessary for resolving the
contradictions appearing after the experiment of the JLab collaboration on the
measurement of the proton form factors with the method of polarization transfer
from the initial electron to the final proton.


title: Properties and refinements of the fused lasso

abstract:
  We consider estimating an unknown signal, both blocky and sparse, which is
corrupted by additive noise. We study three interrelated least squares
procedures and their asymptotic properties. The first procedure is the fused
lasso, put forward by Friedman et al. [Ann. Appl. Statist. 1 (2007) 302--332],
which we modify into a different estimator, called the fused adaptive lasso,
with better properties. The other two estimators we discuss solve least squares
problems on sieves; one constrains the maximal $\ell_1$ norm and the maximal
total variation seminorm, and the other restricts the number of blocks and the
number of nonzero coordinates of the signal. We derive conditions for the
recovery of the true block partition and the true sparsity patterns by the
fused lasso and the fused adaptive lasso, and we derive convergence rates for
the sieve estimators, explicitly in terms of the constraining parameters.


title: Kondo polarons in a one-dimensional Fermi gas

abstract:
  We consider the motion of a spin-1/2 impurity in a one-dimensional gas of
spin-1/2 fermions. For antiferromagnetic interaction between the impurity and
the fermions, the low temperature behavior of the system is governed by the
two-channel Kondo effect, leading to the impurity becoming completely opaque to
the spin excitations of the gas. As well as the known spectral signatures of
the two-channel Kondo effect, we find that the low temperature mobility of the
resulting `Kondo polaron' takes the universal form $\mu\to \frac{3\hbar
v_F^2}{2\pi k_B^2T^2}$, in sharp contrast to the spinless case where
$\mu\propto T^{-4}$.


title:
Baryon number, strangeness and electric charge fluctuations at zero and
  non-zero chemical potential

abstract:
  We present results on baryon number, strangeness and electric charge
fluctuations in QCD at non-zero density and temperature obtained from lattice
calculations with almost physical quark masses. At vanishing chemical
potential, i.e. under conditions almost realized at RHIC and the LHC, quartic
fluctuations of net baryon number and strangeness are large in a narrow
temperature interval characterizing the transition region from the low to the
high temperature phase. Our results are based on Taylor expansions in light and
strange quark chemical potentials, i.e. we rigorously compute corrections to
bulk thermodynamic quantities at non vanishing chemical potential, by
performing a Taylor expansion in $\mu/T$. We find non-monotonic behavior for
the radius of convergence of this series, which could be a hint for a critical
end-point in the ($T,\mu$)-plane.


title: Spitzer IRS Spectra of Optically Faint IRAS Sources

abstract:
  Extragalactic sources from the IRAS Faint Source Catalog (FSC) which have the
optically faintest magnitudes (E > 18) were selected by spatial coincidence
with a source in the FIRST radio survey, and 28 of these sources have been
observed with the Infrared Spectrograph on Spitzer (IRS). While an infrared
source is always detected with the IRS at the FIRST position, only ~ 50% of the
infrared sources are real FSC detections, as estimated from the number of
sources for which the fv(25um) determined with the IRS is fainter than the
sensitivity limit for the FSC. Sources have 0.12 < z < 1.0 and luminosities
(ergs per s) 43.3 < log[vLv(5.5um)] < 46.7, encompassing the range from local
ULIRGs to the most luminous sources discovered by Spitzer at z ~ 2. Detectable
PAH features are found in 15 of the sources (54%), and measurable silicate
absorption is found in 19 sources (68%); both PAH emission and silicate
absorption are present in 11 sources. PAH luminosities are used to determine
the starburst fraction of bolometric luminosity, and model predictions for a
dusty torus are used to determine the AGN fraction of luminosity in all sources
based on log[vLv(5.5um)]. Approximately half of the sources have luminosity
dominated by an AGN and approximately half by a starburst. The ratio of
infrared to radio flux, defined as q = log[fv(25um)/fv(1.4 GHz)], does not
distinguish between AGN and starburst for these sources.


title:
Analytic Approximations for Transit Light Curve Observables,
  Uncertainties, and Covariances

abstract:
  The light curve of an exoplanetary transit can be used to estimate the
planetary radius and other parameters of interest. Because accurate parameter
estimation is a non-analytic and computationally intensive problem, it is often
useful to have analytic approximations for the parameters as well as their
uncertainties and covariances. Here we give such formulas, for the case of an
exoplanet transiting a star with a uniform brightness distribution. We also
assess the advantages of some relatively uncorrelated parameter sets for
fitting actual data. When limb darkening is significant, our parameter sets are
still useful, although our analytic formulas underpredict the covariances and
uncertainties.


title: The MHV QCD Lagrangian

abstract:
  We perform a canonical change of the field variables of light-cone gauge
massless QCD to obtain a lagrangian whose terms are proportional up to
polarisation factors to MHV amplitudes and continued off shell by the CSW
prescription. We solve for this transformation as a series expansion to all
orders in the new fields, and use this to prove that the resulting vertices are
indeed MHV vertices as claimed. We also demonstrate how this works explicitly
for the vertices with: two quarks and two gluons, four quarks, and a particular
helicity configuration of two quarks and three gluons. Finally, we generalise
the construction to massive QCD.


title: A Mems Tribometer for on-Chip Measurements of Dynamic Friction Loops

abstract:
  A MEMS based tribometer has been developed that can be read out with
nanometer and nano-Newton resolution, approaching the resolution and
sensitivity of a friction force microscope (FFM). It can be used to study
friction of MEMS device sidewall surfaces. We find repeatable but irregular
stick-slip behavior related to the surface roughness or surface modification
(wear), depending on the normal force between the sliding surfaces. In
addition, we show that normal force modulation can decrease the apparent
friction even though the average normal force remains the same. This may be a
technologically viable way to reduce friction and wear in microscopic contacts.


title: Asymptotically Good LDPC Convolutional Codes Based on Protographs

abstract:
  LDPC convolutional codes have been shown to be capable of achieving the same
capacity-approaching performance as LDPC block codes with iterative
message-passing decoding. In this paper, asymptotic methods are used to
calculate a lower bound on the free distance for several ensembles of
asymptotically good protograph-based LDPC convolutional codes. Further, we show
that the free distance to constraint length ratio of the LDPC convolutional
codes exceeds the minimum distance to block length ratio of corresponding LDPC
block codes.


title: Diamond-alpha Integral Inequalities on Time Scales

abstract:
  The theory of the calculus of variations was recently extended to the more
general time scales setting, both for delta and nabla integrals. The primary
purpose of this paper is to further extend the theory on time scales, by
establishing some basic diamond-alpha dynamic integral inequalities. We prove
generalized versions of H\"{o}lder, Cauchy-Schwarz, Minkowski, and Jensen's
inequalities. For the particular case when alpha is equal to one or alpha is
equal to zero one gets, respectively, correspondent delta and nabla
inequalities. If we further restrict ourselves by fixing the time scale to the
real or integer numbers, then we obtain the classical inequalities, whose role
in optimal control is well known. By analogy, we trust that the diamond-alpha
integral inequalities we prove here will be important in the study of control
systems on times scales.


title:
Spatial characterization of the magnetic field profile of a probe tip
  used in magnetic resonance force microscopy

abstract:
  We have developed the experimental approach to characterize spatial
distribution of the magnetic field produced by cantilever tips used in magnetic
resonance force microscopy (MRFM). We performed MRFM measurements on a well
characterized diphenyl-picrylhydrazyl (DPPH) film and mapped the 3D field
profile produced by a Nd2Fe14B probe tip. Using our technique field profiles of
arbitrarily shaped probe magnets can be imaged.


title:
Derivative loss for Kirchhoff equations with non-Lipschitz nonlinear
  term

abstract:
  In this paper we consider the Cauchy boundary value problem for the abstract
Kirchhoff equation with a continuous nonlinearity m : [0,+\infty) -->
[0,+\infty). It is well known that a local solution exists provided that the
initial data are regular enough. The required regularity depends on the
continuity modulus of m. In this paper we present some counterexamples in order
to show that the regularity required in the existence results is sharp, at
least if we want solutions with the same space regularity of initial data. In
these examples we construct indeed local solutions which are regular at t = 0,
but exhibit an instantaneous (often infinite) derivative loss in the space
variables.


title: Logarithms and Square Roots of Real Matrices

abstract:
  In these notes, we consider the problem of finding the logarithm or the
square root of a real matrix. It is known that for every real n x n matrix, A,
if no real eigenvalue of A is negative or zero, then A has a real logarithm,
that is, there is a real matrix, X, such that e^X = A. Furthermore, if the
eigenvalues, xi, of X satisfy the property -pi < Im(xi) < pi, then X is unique.
It is also known that under the same condition every real n x n matrix, A, has
a real square root, that is, there is a real matrix, X, such that X^2 = A.
Moreover, if the eigenvalues, rho e^{i theta}, of X satisfy the condition -pi/2
< theta < pi/2, then X is unique. These theorems are the theoretical basis for
various numerical methods for exponentiating a matrix or for computing its
logarithm using a method known as scaling and squaring (resp. inverse scaling
and squaring). Such methods play an important role in the log-Euclidean
framework due to Arsigny, Fillard, Pennec and Ayache and its applications to
medical imaging. Actually, there is a necessary and sufficient condition for a
real matrix to have a real logarithm (or a real square root) but it is fairly
subtle as it involves the parity of the number of Jordan blocks associated with
negative eigenvalues. As far as I know, with the exception of Higham's recent
book, proofs of these results are scattered in the literature and it is not
easy to locate them. Moreover, Higham's excellent book assumes a certain level
of background in linear algebra that readers interested in the topics of this
paper may not possess so we feel that a more elementary presentation might be a
valuable supplement to Higham. In these notes, I present a unified exposition
of these results and give more direct proofs of some of them using the Real
Jordan Form.


title:
Computational study of exciton generation in suspended carbon nanotube
  transistors

abstract:
  Optical emission from carbon nanotube transistors (CNTFETs) has recently
attracted significant attention due to its potential applications. In this
paper, we use a self-consistent numerical solution of the Boltzmann transport
equation in the presence of both phonon and exciton scattering to present a
detailed study of the operation of a partially suspended CNTFET light emitter,
which has been discussed in a recent experiment. We determine the energy
distribution of hot carriers in the CNTFET, and, as reported in the experiment,
observe localized generation of excitons near the trench-substrate junction and
an exponential increase in emission intensity with a linear increase in current
versus gate voltage. We further provide detailed insight into device operation,
and propose optimization schemes for efficient exciton generation; a deeper
trench increases the generation efficiency, and use of high-k substrate oxides
could lead to even larger enhancements.


title: 1-D Mott insulator transition of a Bose-Einstein condensate

abstract:
  The superfluid to one-dimensional Mott-insulator transition of a 87Rb
Bose-Einstein condensate is demonstrated. In the experiment, we apply a
one-dimensional optical lattice, formed by two laser beams with a wavelength of
852 nm, to a three dimensional BEC in a shallow trap. We use Kapitza-Dirac
scattering to determine the depth of the optical lattice without knowledge of
its exact geometry. We further study the dynamics of the transition as well as
steady-state phase behavior specific to the one-dimensional case.


title:
Consideration of arrayed $e$-beam microcolumn based systems
  potentialities for wafer defects inspection

abstract:
  The $e$-beam column which is intended on defects inspection is considered.
The defects which are to be examined or potentially might be examined at
inspection stage are briefly considered. Interrelations between the system
parameters is ascertaining and the ways of optimization and the technical
requirements to the system in whole are discussed. As a result, we find the
optimal combinations of the system parameters for the purpose.


title: P-V-T Equation of State for Periclase

abstract:
  Collecting the complete data set of previous experiments on periclase,
covering a pressure and temperature range of 0-141.8 GPa and 100-3031 K
respectively, the first comprehensive P-V-T description of MgO is presented
comprising all previous experiments. The P-V-T EoS of Birch-Murnaghan,
Rydberg-Vinet and Garai are determined by unrestricted fitting. The three EoSs
are consistent and a unique set of parameters is able to cover the entire
pressure and temperature range. The RMS misfits for the pressure are 0.371 GPa,
0.381 GPa and 0.396 GPa for the Garai, Birch-Murnaghan and Rydberg-Vinet EoSs.
The RMS misfits for the volume and the temperature are 0.018 cm3 and 60.3 K for
the EoS of Garai.


title:
Correlation of the radio continuum, infrared, and CO molecular emissions
  in NGC 3627

abstract:
  We present new radio continuum observations, taken at 1.4 GHz with the Very
Large Array, and new observations in the CO line, taken with the Plateau de
Bure interferometer, of two regions of the spiral galaxy NGC 3627. Comparing
these observations with archival Spitzer and H_{alpha} data we study the
correlation of the radio continuum (RC), infrared-8 um and CO emissions at a
spatial resolution of 100 pc. We compare the point-by-point variations of the
RC, CO, and 8um brightnesses in two distinct regions of 2 kpc \times 2 kpc in
size of NGC 3627. We examined scale much lower than the electron diffusion
scale, where a break down of the correlations would be expected. However no
evidence for such correlation break down has been found. The RC emission
follows well the distribution of CO and the widths of several structures,
measured along slices across them, are comparable. Furthermore, we found that
down to a spatial scale of 100 pc the radio continuum emission is correlated
with dust emissions at 4.5, 5.8, and 8 um, that traces different dust
temperatures. We present a new perspective with which visualizing and studying
the RC-CO-24 um and RC-CO-8 um correlations, by using a three-dimensional
representation. We fit the observed data with a three dimensional line,
obtaining a rms of 0.25 dex. The observed correlation enhances the complexity
of the electrons diffusion, losses and injection mechanisms, and of their
connection to star formation processes, described by molecular and dust
emissions. We plan to further investigate this connection using spatially
resolved spectral index studies at low radio frequencies where the thermal
emission component is seemingly negligible.


title: All-Dielectric Rod-Type Metamaterials at Optical Frequencies

abstract:
  Light propagation in all-dielectric rod-type metamaterials is studied
theoretically. The electric and magnetic dipole moments of the rods are derived
analytically in the long-wavelength limit. The effective permittivity and
permeability of a square lattice of rods are calculated by homogenizing the
corresponding array of dipoles. The role of dipole resonances in the optical
properties of the rod array is interpreted. This structure is found to exhibit
a true left-handed behavior, confirming previous experiments [L. Peng
\textit{et al.}, Phys. Rev. Lett. \textbf{98}, 157403 (2007)]. A scaling
analysis shows that this effect holds at optical frequencies and can be
obtained by using rods made, for example, of silicon.


title: J/psi and psi(2S) Radiative Transitions to eta_c

abstract:
  Using 24.5 million psi(2S) decays collected with the CLEO-c detector at CESR
we present the most precise measurements of magnetic dipole transitions in the
charmonium system. We measure B(psi(2S)->gamma eta_c) =
(4.32+/-0.16+/-0.60)x10^-3, B(J/psi->gamma eta_c)/B(psi(2S)->gamma eta_c) =
4.59+/-0.23+/-0.64, and B(J/psi->gamma eta_c) = (1.98+/-0.09+/-0.30)%. We
observe a distortion in the eta_c line shape due to the photon-energy
dependence of the magnetic dipole transition rate. We find that measurements of
the eta_c mass are sensitive to the line shape, suggesting an explanation for
the discrepancy between measurements of the eta_c mass in radiative transitions
and other production mechanisms.


title: Probes of Lorentz Violation in Neutrino Propagation

abstract:
  It has been suggested that the interactions of energetic particles with the
foamy structure of space-time thought to be generated by quantum-gravitational
(QG) effects might violate Lorentz invariance, so that they do not propagate at
a universal speed of light. We consider the limits that may be set on a linear
or quadratic violation of Lorentz invariance in the propagation of energetic
neutrinos, v/c=[1 +- (E/M_\nuQG1)] or [1 +- (E/M_\nu QG2}^2], using data from
supernova explosions and the OPERA long-baseline neutrino experiment. Using the
SN1987a neutrino data from the Kamioka II, IMB and Baksan experiments, we set
the limits M_\nuQG1 > 2.7(2.5)x10^10 GeV for subluminal (superluminal)
propagation, respectively, and M_\nuQG2 >4.6(4.1)x10^4 GeV at the 95%
confidence level. A future galactic supernova at a distance of 10 kpc would
have sensitivity to M_\nuQG1 > 2(4)x10^11 GeV for subluminal (superluminal)
propagation, respectively, and M_\nuQG2 > 2(4)x10^5 GeV. With the current CNGS
extraction spill length of 10.5 micro seconds and with standard clock
synchronization techniques, the sensitivity of the OPERA experiment would reach
M_\nuQG1 ~ 7x10^5 GeV (M_\nuQG2 ~ 8x10^3 GeV) after 5 years of nominal running.
If the time structure of the SPS RF bunches within the extracted CNGS spills
could be exploited, these figures would be significantly improved to M_\nuQG1 ~
5x10^7 GeV (M_\nuQG2 ~ 4x10^4 GeV). These results can be improved further if
similar time resolution can be achieved with neutrino events occurring in the
rock upstream of the OPERA detector: we find potential sensitivities to
M_\nuQG1 ~ 4x10^8 GeV and M_\nuQG2 ~ 7x10^5 GeV.


title:
Diffraction of Coherent Light with Sinusoidal Amplitude by a Thin-Slit
  Grid

abstract:
  We report on the experimental findings of a thin-slit grid diffraction of a
coherent light beam with sinusoidal amplitude. We create the sinusoidal
amplitude by placing a thin-slit grid at the center of the dark fringes of an
interference pattern resulting from laser light passing through a dual pinhole.
The experimental results show good agreement with diffraction calculations of a
thin-slit grid placed at the center of the dark fringes produced by two
coherent beams that intersect at small angle. The results are applied to
wire-grid diffraction in the Afshar experiment.


title:
Strong-Coupling Phases of Frustrated Bosons on a 2-leg Ladder with Ring
  Exchange

abstract:
  Developing a theoretical framework to access quantum phases of itinerant
bosons or fermions in two dimensions (2D) that exhibit singular structure along
surfaces in momentum space but have no quasi-particle description remains as a
central challenge in the field of strongly correlated physics. In this paper we
propose that distinctive signatures of such 2D strongly correlated phases will
be manifest in quasi-one-dimensional "N-leg ladder" systems. Characteristic of
each parent 2D quantum liquid would be a precise pattern of 1D gapless modes on
the N-leg ladder. These signatures could be potentially exploited to approach
the 2D phases from controlled numerical and analytical studies in quasi-1D. As
a first step we explore itinerant boson models with a frustrating ring exchange
interaction on the 2-leg ladder, searching for signatures of the recently
proposed two-dimensional d-wave correlated Bose liquid (DBL) phase. A
combination of exact diagonalization, density matrix renormalization group,
variational Monte Carlo, and bosonization analysis of a quasi-1D gauge theory,
all provide compelling evidence for the existence of a new strong-coupling
phase of bosons on the 2-leg ladder which can be understood as a descendant of
the two-dimensional DBL. We suggest several generalizations to quantum spin and
electron Hamiltonians on ladders which could likewise reveal fingerprints of
such 2D non-Fermi liquid phases.


title: Arithmetic Laplacians

abstract:
  We develop an arithmetic analogue of elliptic partial differential equations.
The role of the space coordinates is played by a family of primes, and that of
the space derivatives along the various primes are played by corresponding
Fermat quotient operators subjected to certain commutation relations. This
leads to arithmetic linear partial differential equations on algebraic groups
that are analogues of certain operators in analysis constructed from
Laplacians. We classify all such equations on one dimensional groups, and
analyze their spaces of solutions.


title: On multiplicative conditionally free convolution

abstract:
  Using the combinatorics of non-crossing partitions, we construct a
conditionally free analogue of the Voiculescu's S-transform. The result is
applied to analytical description of conditionally free multiplicative
convolution and characterization of infinite divisibility.


title:
Powerful GeV emission from a gamma-ray-burst shock wave scattering
  stellar photons

abstract:
  The gamma-ray bursts (GRBs) of long duration are very likely to be connected
to the death of massive stars. The gamma-ray emission is believed to come from
energy released internally in a flow that moves at ultrarelativistic speed. The
fast flow drives a shock wave into the external medium leading to the afterglow
emission. Most massive stars form in dense clusters, their high luminosity
producing a very dense radiation field. Here, I explore the observational
consequences of the interaction of the shocked external medium of the burst
with the photon field of a nearby O star. I show that inverse Compton
scattering of the stellar photons by electrons heated by the shock leads to
powerful gamma-ray emission in the ~1-100 GeV range. This emission appears
minutes to hours after the burst and can be easily detected by Cherenkov
telescopes and probably with the GLAST satellite. This signal may have already
been observed in GRB 940217 and can yield important information about the
circumburst environment and the extragalactic background light.


title: Low-mass X-ray binaries in the bulge of the Milky Way

abstract:
  We study the population of low-mass X-ray binaries (LMXBs) in the Galactic
bulge using the deep survey of this region by the IBIS telescope aboard the
INTEGRAL observatory. Thanks to the increased sensitivity with respect to
previous surveys of this field, we succeeded to probe the luminosity function
(LF) of LMXBs down to ~7e34 erg/sec in the 17-60keV energy band. The slope dlog
N/dlog L=-0.96+/0.20 measured in the 1e35-1e37 erg/sec range confirms that the
LMXB LF flattens below L_x<1e37 erg/sec with respect to higher luminosities. We
discuss the origin of the observed LF flattening. We demonstrate that the
spatial distribution of persistent LMXBs in the Galactic Center/Galactic bulge
region is consistent with a model of stellar mass distribution that includes
the nuclear stellar disk component in the innermost degree of the Galaxy. The
spatial distribution of transient LMXBs detected in the Galactic Center region
indicates an increased fraction of transient sources in the innermost degree of
the Galaxy with respect to outer regions.


title:
Directly determining the relative phase of two coherent solitary waves
  in attractive Bose-Einstein condensates

abstract:
  We study the dynamic structure factor of two coherent bright solitary waves
in attractive Bose- Einstein condensates confined in a harmonic trap. We
demonstrate that the wave function of the two solitary waves with a fixed
relative phase shows interference in momentum space. The fringes are shifted
depending on the values of the phase. This momentum interference can be
extracted from the dynamic structure factor of the system using stimulated
two-photon Bragg scattering. Thus our method provides a way to measure the
relative phase directly.


title: Diffraction at the Tevatron and the LHC

abstract:
  In these lectures, we present and discuss the most recent results on
inclusive diffraction at the Tevatron collider and give the prospects at the
LHC. We also describe the search for exclusive events at the Tevatron. Of
special interest is the exclusive production of Higgs boson and heavy objects
($W$, top, stop pairs) at the LHC which will require precise measurements and
analyses of inclusive and exclusive diffraction to constrain further the gluon
density in the pomeron. At the end of these lectures, we describe the projects
to install forward detectors at the LHC to fulfil these measurements.


title: Experimental continuous variable cloning of partial quantum information

abstract:
  The fidelity of a quantum transformation is strongly linked with the prior
partial information of the state to be transformed. We illustrate this
interesting point by proposing and demonstrating the superior cloning of
coherent states with prior partial information. More specifically, we propose
two simple transformations that under the Gaussian assumption optimally clone
symmetric Gaussian distributions of coherent states as well as coherent states
with known phases. Furthermore, we implement for the first time near-optimal
state-dependent cloning schemes relying on simple linear optics and
feedforward.


title:
Spitzer Mid-Infrared Spectroscopy of Infrared Luminous Galaxies at z~2
  III: Far-IR to Radio Properties and Optical Spectral Diagnostics

abstract:
  We present the far-IR, millimeter, and radio photometry as well as optical
and near-IR spectroscopy of a sample of 48 z~1-3 Spitzer-selected ULIRGs with
IRS mid-IR spectra. Our goals are to compute their bolometric emission, and to
determine both the presence and relative strength of their AGN and starburst
components. We find that strong-PAH sources tend to have higher 160um and 1.2mm
fluxes than weak-PAH sources. The depth of the 9.7um silicate feature does not
affect MAMBO detectability. We fit the far-IR SEDs of our sample and find an
average <L_{IR}>~7x10^{12}Lsun for our z>1.5 sources. Spectral decomposition
suggests that strong-PAH sources typically have ~20-30% AGN fractions. Weak-PAH
sources by contrast tend to have >~70% AGN fractions, with a few sources having
comparable contributions of AGN and starbursts. The optical line diagnostics
support the presence of AGN in the bulk of the weak-PAH sources. With one
exception, our sources are narrow-line sources, show no obvious correspondence
between the optical extinction and the silicate feature depth, and, in two
cases, show evidence for outflows. Radio AGN are present in both strong-PAH and
weak-PAH sources. This is supported by our sample's far-IR-to-radio ratios (q)
being consistently below the average value of 2.34 for local star-forming
galaxies. We use survival analysis to include the lower-limits given by the
radio-undetected sources, arriving at <q>=2.07+/-0.01 for our z>1.5 sample. In
total, radio and, where available, optical line diagnostics support the
presence of AGN in 57% of the z>1.5 sources, independent of IR-based
diagnostics. For higher-z sources, the AGN luminosities alone are estimated to
be >10^{12}Lsun, which, supported by the [OIII] luminosities, implies that the
bulk of our sources host obscured quasars.


title: Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study

abstract:
  We present a detailed study on the magnetic order in the undoped mother
compound LaOFeAs of the recently discovered Fe-based superconductor
LaO$_{1-x}$F$_x$FeAs. In particular, we present local probe measurements of the
magnetic properties of LaOFeAs by means of $^{57}$Fe M\"ossbauer spectroscopy
and muon spin relaxation in zero external field along with magnetization and
resistivity studies. These experiments prove a commensurate static magnetic
order with a strongly reduced ordered moment of 0.25(5) $\mu_B$ at the iron
site below T_N = 138 K, well separated from a structural phase transition at
T_N = 156 K. The temperature dependence of the sublattice magnetization is
determined and compared to theory. Using a four-band spin density wave model
both, the size of the order parameter and the quick saturation below T_N are
reproduced.


title: The oldest X-ray supernovae: X-ray emission from 1941C, 1959D, 1968D

abstract:
  We have studied the X-ray emission from four historical Type-II supernovae
(the newly-discovered 1941C in NGC 4631 and 1959D in NGC 7331; and 1968D, 1980K
in NGC 6946), using Chandra ACIS-S imaging. In particular, the first three are
the oldest ever found in the X-ray band, and provide constraints on the
properties of the stellar wind and circumstellar matter encountered by the
expanding shock at more advanced stages in the transition towards the remnant
phase. We estimate emitted luminosities ~ 5 x 10^{37} erg/s for SN 1941C, ~ a
few x 10^{37} erg/s for SN 1959D, ~ 2 x 10^{38} erg/s for SN 1968D, and ~ 4 x
10^{37} erg/s for SN 1980K, in the 0.3-8 keV band. X-ray spectral fits to SN
1968D suggest the presence of a harder component, possibly a power law with
photon index ~ 2, contributing ~ 10^{37} erg/s in the 2-10 keV band. We
speculate that it may be evidence of non-thermal emission from a Crab-like
young pulsar.


title:
Manipulating Spins by Cantilever Synchronized Frequency Modulation: A
  Variable Resolution Magnetic Resonance Force Microscope

abstract:
  We report a new spin manipulation protocol for periodically reversing the
sample magnetization for Magnetic Resonance Force Microscopy. The protocol
modulates the microwave excitation frequency synchronously with the position of
the oscillating detection cantilever, thus allowing manipulation of the spin
magnetization independent of both magnetic field gradient strength and
cantilever response time. This allows continuous variation of the detected
sample volume and is effective regardless of spin relaxation rate. This
enhanced flexibility improves the utility of MRFM as a generally applicable
imaging and characterization tool.


title: Eigenvalues, Separability and Absolute Separability of Two-Qubit States

abstract:
  Substantial progress has recently been reported in the determination of the
Hilbert-Schmidt (HS) separability probabilities for two-qubit and qubit-qutrit
(real, complex and quaternionic) systems. An important theoretical concept
employed has been that of a separability function. It appears that if one could
analogously obtain separability functions parameterized by the eigenvalues of
the density matrices in question--rather than the diagonal entries, as
originally used--comparable progress could be achieved in obtaining
separability probabilities based on the broad, interesting class of monotone
metrics (the Bures, being its most prominent [minimal] member). Though
large-scale numerical estimations of such eigenvalue-parameterized functions
have been undertaken, it seems desirable also to study them in
lower-dimensional specialized scenarios in which they can be exactly obtained.
In this regard, we employ an Euler-angle parameterization of SO(4) derived by
S. Cacciatori (reported in an Appendix)--in the manner of the SU(4)-density
matrix parameterization of Tilma, Byrd and Sudarshan. We are, thus, able to
find simple exact separability (inverse-sine-like) functions for two real
two-qubit (rebit) systems, both having three free eigenvalues and one free
Euler angle. We also employ the important Verstraete-Audenaert-de Moor bound to
obtain exact HS probabilities that a generic two-qubit state is absolutely
separable (that is, can not be entangled by unitary transformations). In this
regard, we make copious use of trigonometric identities involving the
tetrahedral dihedral angle arccos(1/3).


title:
Towards Exploring Fundamental Limits of System-Specific Cryptanalysis
  Within Limited Attack Classes: Application to ABSG

abstract:
  A new approach on cryptanalysis is proposed where the goal is to explore the
fundamental limits of a specific class of attacks against a particular
cryptosystem. As a first step, the approach is applied on ABSG, which is an
LFSR-based stream cipher where irregular decimation techniques are utilized.
Consequently, under some mild assumptions, which are common in cryptanalysis,
the tight lower bounds on the algorithmic complexity of successful Query-Based
Key-Recovery attacks are derived for two different setups of practical
interest. The proofs rely on the concept of ``typicality'' of information
theory.


title: Component separation methods for the Planck mission

abstract:
  The Planck satellite will map the full sky at nine frequencies from 30 to 857
GHz. The CMB intensity and polarization that are its prime targets are
contaminated by foreground emission. The goal of this paper is to compare
proposed methods for separating CMB from foregrounds based on their different
spectral and spatial characteristics, and to separate the foregrounds into
components of different physical origin. A component separation challenge has
been organized, based on a set of realistically complex simulations of sky
emission. Several methods including those based on internal template
subtraction, maximum entropy method, parametric method, spatial and harmonic
cross correlation methods, and independent component analysis have been tested.
Different methods proved to be effective in cleaning the CMB maps from
foreground contamination, in reconstructing maps of diffuse Galactic emissions,
and in detecting point sources and thermal Sunyaev-Zeldovich signals. The power
spectrum of the residuals is, on the largest scales, four orders of magnitude
lower than that of the input Galaxy power spectrum at the foreground minimum.
The CMB power spectrum was accurately recovered up to the sixth acoustic peak.
The point source detection limit reaches 100 mJy, and about 2300 clusters are
detected via the thermal SZ effect on two thirds of the sky. We have found that
no single method performs best for all scientific objectives. We foresee that
the final component separation pipeline for Planck will involve a combination
of methods and iterations between processing steps targeted at different
objectives such as diffuse component separation, spectral estimation and
compact source extraction.


title: Anomalous Diffusion

abstract:
  Recent investigations call attention to the dynamics of anomalous diffusion
and its connection with basic principles of statistical mechanics. We present
here a short review of those ideas and their implications.


title: Normalizing inclusive rare B decays

abstract:
  The inclusive semileptonic branching ratio is often employed to normalize
other inclusive B decays. Using recent determinations of the non-perturbative
parameters of the Operator Product Expansion we compute the normalization
factor for the branching ratio of B->X_s gamma and find a few percent
enhancement with respect to previous determinations.


title:
Capacity of The Discrete-Time Non-Coherent Memoryless Gaussian Channels
  at Low SNR

abstract:
  We address the capacity of a discrete-time memoryless Gaussian channel, where
the channel state information (CSI) is neither available at the transmitter nor
at the receiver. The optimal capacity-achieving input distribution at low
signal-to-noise ratio (SNR) is precisely characterized, and the exact capacity
of a non-coherent channel is derived. The derived relations allow to better
understanding the capacity of non-coherent channels at low SNR. Then, we
compute the non-coherence penalty and give a more precise characterization of
the sub-linear term in SNR. Finally, in order to get more insight on how the
optimal input varies with SNR, upper and lower bounds on the non-zero mass
point location of the capacity-achieving input are given.


title: The nonperturbative decay of SUSY flat directions

abstract:
  We compute the nonperturbative decay of supersymmetric flat directions due to
their D-term potential. Flat directions can develop large vacuum expectation
values (vevs) during inflation, and, if they are long-lived, this can strongly
affect the reheating and thermalization stages after the inflation. We study a
generic system of two U(1) or SU(2) flat directions which are cosmologically
evolving after inflation. After proper gauge fixing, we show that the
excitations of the fields around this background can undergo exponential
amplification, at the expense of the energy density of the flat directions. We
compute this effect for several values of the masses and the initial vevs of
the two flat directions, through a combination of analytical methods and
extensive numerical simulations. For a wide range of parameters the flat
directions decay within their first few rotations.


title: Diamond-alpha Polynomial Series on Time Scales

abstract:
  The objective of this paper is twofold: (i) to survey existing results of
generalized polynomials on time scales, covering definitions and properties for
both delta and nabla derivatives; (ii) to extend previous results by using the
more general notion of diamond-alpha derivative on time scales. We introduce a
new notion of combined-polynomial series on a time scale, as a convex linear
combination of delta and nabla generalized series. Main results are formulated
for homogenous time scales. As an example, we compute diamond-alpha derivatives
on time scales for delta and nabla exponential functions.


title: The Dynamics of Conjunctive and Disjunctive Boolean Networks

abstract:
  The relationship between the properties of a dynamical system and the
structure of its defining equations has long been studied in many contexts.
Here we study this problem for the class of conjunctive (resp. disjunctive)
Boolean networks, that is, Boolean networks in which all Boolean functions are
constructed with the AND (resp. OR) operator only. The main results of this
paper describe network dynamics in terms of the structure of the network
dependency graph (topology). For a given such network, all possible limit cycle
lengths are computed and lower and upper bounds for the number of cycles of
each length are given. In particular, the exact number of fixed points is
obtained. The bounds are in terms of structural features of the dependency
graph and its partially ordered set of strongly connected components. For
networks with strongly connected dependency graph, the exact cycle structure is
computed.


title: The mass density field in simulated non-Gaussian scenarios

abstract:
  In this work we study the properties of the mass density field in the
non-Gaussian world models simulated by Grossi et al. 2007. In particular we
focus on the one-point density probability distribution function of the mass
density field in non-Gausian models with quadratic non-linearities quantified
by the usual parameter f_NL. We find that the imprints of primordial
non-Gaussianity are well preserved in the negative tail of the probability
function during the evolution of the density perturbation. The effect is
already noticeable at redshifts as large as 4 and can be detected out to the
present epoch. At z=0 we find that the fraction of the volume occupied by
regions with underdensity delta < -0.9, typical of voids, is about 1.3 per cent
in the Gaussian case and increases to ~2.2 per cent if f_NL=-1000 while
decreases to ~0.5 per cent if f_NL=+1000. This result suggests that void-based
statistics may provide a powerful method to detect non-Gaussianity even at low
redshifts which is complementary to the measurements of the higher-order
moments of the probability distribution function like the skewness or the
kurtosis for which deviations from the Gaussian case are detected at the 25-50
per cent level.


title: Sustaining Educational Reforms in Introductory Physics

abstract:
  While it is well known which curricular practices can improve student
performance on measures of conceptual understanding, the sustaining of these
practices and the role of faculty members in implementing these practices are
less well understood. We present a study of the hand-off of Tutorials in
Introductory Physics from initial adopters to other instructors at the
University of Colorado, including traditional faculty not involved in physics
education research. The study examines the impact of implementation of
Tutorials on student conceptual learning across eight first-semester, and seven
second-semester courses, for fifteen faculty over twelve semesters, and
includes roughly 4000 students. It is possible to demonstrate consistently
high, and statistically indistinguishable, student learning gains for different
faculty members; however, such results are not the norm, and appear to rely on
a variety of factors. Student performance varies by faculty background -
faculty involved in, or informed by physics education research, consistently
post higher student learning gains than less-informed faculty. Student
performance in these courses also varies by curricula used - all semesters in
which the research-based Tutorials and Learning Assistants are used have higher
student learning gains than those semesters that rely on non-research based
materials and do not employ Learning Assistants.


title: Isoperimetric Problems of the Calculus of Variations on Time Scales

abstract:
  We prove a necessary optimality condition for isoperimetric problems on time
scales in the space of delta-differentiable functions with rd-continuous
derivatives. The results are then applied to Sturm-Liouville eigenvalue
problems on time scales.


title: Tidal Disruption of Protoclusters in Giant Molecular Clouds

abstract:
  We study the collapse of protoclusters within a giant molecular cloud (GMC)
to determine the conditions under which collapse is significantly disrupted.
Motivated by observations of star forming regions which exhibit flattened cloud
structures, this study considers collapsing protoclusters with disk geometries.
The collapse of a 10^3 Msun protocluster initially a distance of 2-10 pc from a
10^3 - 10^6 Msun point mass is numerically calculated. Simulations with zero
initial relative velocity between the two are completed as well as simulations
with relative velocities consistent with those observed in GMCs. The results
allow us to define the conditions under which it is safe to assume protocluster
collapse proceeds as if in isolation. For instance, we find the collapse of a
10^3 Msun protocluster will be significantly disrupted if it is within 2-4 pc
of a 10^4 Msun point mass. Thus, the collapse of a 10^3 Msun protocluster can
be considered to proceed as if in isolation if it is more than ~ 4 pc away from
a 10^4 Msun compact object. In addition, in no portion of the sampled parameter
space does the gravitational interaction between the protocluster disk and the
massive particle significantly disperse the disk into the background GMC. We
discuss the distribution of clusters of young stellar objects within the
Perseus and Mon R2 star forming regions, which are consistent with the results
of our simulations and the limitations of our results in gas dominated regions
such as the Orion cloud.


title: Comment on "Self-Purification in Semiconductor Nanocrystals"

abstract:
  In a recent Letter [PRL 96, 226802 (2006)], Dalpian and Chelikowsky claimed
that formation energies of Mn impurities in CdSe nanocrystals increase as the
size of the nanocrystal decreases, and argued that this size dependence leads
to "self-purification" of small nanocrystals. They presented
density-functional-theory (DFT) calculations showing a strong size dependence
for Mn impurity formation energies, and proposed a general explanation. In this
Comment we show that several different DFT codes, pseudopotentials, and
exchange-correlation functionals give a markedly different result: We find no
such size dependence. More generally, we argue that formation energies are not
relevant to substitutional doping in most colloidally grown nanocrystals.


title: Identification of the Origin of Monojet Signatures at the LHC

abstract:
  Several new physics scenarios can lead to monojet signatures at the LHC. If
such events are observed above the Standard Model background it will be
important to identify their origin. In this paper we compare and contrast these
signatures as produced in two very different pictures: vector or scalar
unparticle production in the scale-invariant/conformal regime and graviton
emission in the Arkani-Hamed, Dimopoulos and Dvali extra-dimensional model. We
demonstrate that these two scenarios can be distinguished at the LHC for a
reasonable range of model parameters through the shape of their respective
monojet and/or missing $E_T$ distributions.


title: Search for Squeezed-Pair Correlations at RHIC

abstract:
  Squeezed correlations of particle-antiparticle pairs, also called
Back-to-Back Correlations, are predicted to appear if the hadron masses are
modified in the hot and dense hadronic medium formed in high energy
nucleus-nucleus collisions. Although well-established theoretically, the
squeezed-particle correlations have not yet been searched for experimentally in
high energy hadronic or heavy ion collisions, clearly requiring optimized forms
to experimentally search for this effect. Within a non-relativistic treatment
developed earlier we show that one promising way to search for the BBC signal
is to look into the squeezed correlation function of pairs of phi-mesons at
RHIC energies, plotted in terms of the average momentum of the pair,
K12=(k1+k2)/2. This variable's modulus, 2|K12|, is the non-relativistic limit
of the variable Q_bbc, introduced herewith. The squeezing effects on the HBT
correlation function are also discussed.


title: An example of a weighted algebra $L_p^w(G)$ on uncountable group

abstract:
  We construct examples of weighted algebras $L_p^w(G)$ with $1<p\le 2$ on
uncountable free groups. For $p>2$ no weighted algebras exist on these groups.
  From the other side, we prove that an amenable group on which exist weighted
algebras with $p>1$ must be sigma-compact.


title: Convolution and Cross-Correlation of Ramanujan-Fourier Series

abstract:
  This paper uses the machinery of almost periodic functions to prove that even
without uniform convergence the connection between a pair of almost periodic
functions and the constants of the associated Fourier series exists for both
the convolution and cross-correlation.
  The general results for two almost periodic functions are narrowed and
applied to Ramanujan sums and finally applied to support the specific relation
of the Wiener-Khinchin formula for arithemic functions with a Ramanujan-Fourier
Series.


title: Generalizations of quantum statistics

abstract:
  We review generalizations of quantum statistics, including parabose,
parafermi, and quon statistics, but not including anyon statistics, which is
special to two dimensions.


title:
The Bar-Natan skein module of the solid torus and the homology of (n,n)
  Springer varieties

abstract:
  This paper establishes an isomorphism between the Bar-Natan skein module of
the solid torus with a particular boundary curve system and the homology of the
(n,n) Springer variety. The results build on Khovanov's work with crossingless
matchings and the cohomology of the (n,n) Springer variety. We also give a
formula for comultiplication in the Bar-Natan skein module for this specific
three-manifold and boundary curve system.


title:
Low-lying quasinormal modes of topological AdS black holes and
  hydrodynamics

abstract:
  We analytically calculate the low-lying gravitational quasinormal modes of a
topological AdS black hole of arbitrary dimension. We show that they are in
agreement with corresponding results from the hydrodynamics of the gauge theory
plasma on the boundary, as required by the AdS/CFT correspondence. For some of
these modes, we obtain a lifetime which is comparable to or longer than the
longest lifetime of perturbations of spherical black holes. Thus, these modes
are expected to play an important role in the late time behavior of the gauge
theory plasma.


title: Rouquier blocks of the cyclotomic Hecke algebras of G(de,e,r)

abstract:
  The "Rouquier blocks" of the cyclotomic Hecke algebras, introduced by
Rouquier, are a substitute for the "families of characters", defined by Lusztig
for Weyl groups, which can be applied to all complex reflection groups. In this
article, we determine them for the cyclotomic Hecke algebras of the groups of
the infinite series, G(de,e,r), thus completing their calculation for all
complex reflection groups.


title: The color charge degree of freedom in particle physics

abstract: We review the color charge degree of freedom in particle physics.


title:
Compton Imaging of MeV Gamma-Rays with the Liquid Xenon Gamma-Ray
  Imaging Telescope (LXeGRIT)

abstract:
  The Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT) is the first
realization of a liquid xenon time projection chamber for Compton imaging of
MeV gamma-ray sources in astrophysics. By measuring the energy deposit and the
three spatial coordinates of individual gamma-ray scattering points, the
location of the source in the sky is inferred with Compton kinematics
reconstruction. The angular resolution is determined by the detector's energy
and spatial resolutions, as well as by the separation in space between the
first and second scattering. The imaging response of LXeGRIT was established
with gamma-rays from radioactive sources, during calibration and integration at
the Columbia Astrophysics Laboratory, prior to the 2000 balloon flight mission.
In this paper we describe in detail the various steps involved in imaging
sources with LXeGRIT and present experimental results on angular resolution and
other parameters which characterize its performance as a Compton telescope.


title: Manifestation of three-body forces in f7/2-shell nuclei

abstract:
  The traditional nuclear shell model approach is extended to include many-body
forces. The empirical Hamiltonian with a three-body force is constructed for
the identical nucleons on the 0f7/2 shell. Manifestations of the three-body
force in spectra, binding energies, seniority mixing, particle-hole symmetry,
electromagnetic and particle transition rates are investigated. It is shown
that in addition to the usual expansion of the valence space within the
tranditional two-body shell model, the three-body component in the Hamiltonian
can be an important part improving the quality of the theoretical approach.


title:
Notes on Convex Sets, Polytopes, Polyhedra, Combinatorial Topology,
  Voronoi Diagrams and Delaunay Triangulations

abstract:
  Some basic mathematical tools such as convex sets, polytopes and
combinatorial topology, are used quite heavily in applied fields such as
geometric modeling, meshing, computer vision, medical imaging and robotics.
This report may be viewed as a tutorial and a set of notes on convex sets,
polytopes, polyhedra, combinatorial topology, Voronoi Diagrams and Delaunay
Triangulations. It is intended for a broad audience of mathematically inclined
readers. I have included a rather thorough treatment of the equivalence of
V-polytopes and H-polytopes and also of the equivalence of V-polyhedra and
H-polyhedra, which is a bit harder. In particular, the Fourier-Motzkin
elimination method (a version of Gaussian elimination for inequalities) is
discussed in some detail. I also included some material on projective spaces,
projective maps and polar duality w.r.t. a nondegenerate quadric in order to
define a suitable notion of ``projective polyhedron'' based on cones. To the
best of our knowledge, this notion of projective polyhedron is new. We also
believe that some of our proofs establishing the equivalence of V-polyhedra and
H-polyhedra are new.


title: Simple two Higgs doublet model

abstract:
  We study a simple two Higgs doublet model which reflects, in a
phenomenological way, the idea of compositeness for the Higgs sector. It is
relatively predictive. In one scenario, it allows for a "hidden" usual Higgs
particle in the 100 GeV region and a possible dark matter candidate.


title:
A Khasminskii type averaging principle for stochastic reaction-diffusion
  equations

abstract:
  We prove that an averaging principle holds for a general class of stochastic
reaction-diffusion systems, having unbounded multiplicative noise, in any space
dimension. We show that the classical Khasminskii approach for systems with a
finite number of degrees of freedom can be extended to infinite dimensional
systems.


title:
Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein
  condensate

abstract:
  We report on measurements of the excitation spectrum of a strongly
interacting Bose-Einstein condensate (BEC). A magnetic-field Feshbach resonance
is used to tune atom-atom interactions in the condensate and to reach a regime
where quantum depletion and beyond mean-field corrections to the condensate
chemical potential are significant. We use two-photon Bragg spectroscopy to
probe the condensate excitation spectrum; our results demonstrate the onset of
beyond mean-field effects in a gaseous BEC.


title:
Entangled Fock states for Robust Quantum Optical Metrology, Imaging, and
  Sensing

abstract:
  We propose a class of path-entangled photon Fock states for robust quantum
optical metrology, imaging, and sensing in the presence of loss. We model
propagation loss with beam-splitters and derive a reduced density matrix
formalism from which we examine how photon loss affects coherence. It is shown
that particular entangled number states, which contain a special superposition
of photons in both arms of a Mach-Zehnder interferometer, are resilient to
environmental decoherence. We demonstrate an order of magnitude greater
visibility with loss, than possible with N00N states. We also show that the
effectiveness of a detection scheme is related to super-resolution visibility.


title:
Averaging principle for a class of stochastic reaction-diffusion
  equations

abstract:
  We consider the averaging principle for stochastic reaction-diffusion
equations. Under some assumptions providing existence of a unique invariant
measure of the fast motion with the frozen slow component, we calculate
limiting slow motion. The study of solvability of Kolmogorov equations in
Hilbert spaces and the analysis of regularity properties of solutions, allow to
generalize the classical approach to finite-dimensional problems of this type
in the case of SPDE's.


title:
Morphology of the nonspherically decaying radiation generated by a
  rotating superluminal source: reply to comment

abstract:
  The fact that the formula used by Hannay in his Comment is "from a standard
text on electrodynamics" neither warrants that it is universally applicable,
nor that it is unequivocally correct. We have explicitly shown [J. Opt. Soc.
Am. A 25, 543 (2008)] that,since it does not include the boundary contribution
toward the value of the field, the formula in question is not applicable when
the source is extended and has a distribution pattern that rotates faster than
light in vacuo. The neglected boundary term in the retarded solution to the
wave equation governing the electromagnetic field forms the basis of
diffraction theory. If this term were identically zero, for the reasons given
by Hannay, the iffraction of electromagnetic waves through apertures on a
surface enclosing a source would have been impossible. If this term were
identically zero, for the reasons given by Hannay, the diffraction of
electromagnetic waves through apertures on a surface enclosing a source would
have been impossible.


title: The Letter Q (and Quantitative Constraints on the QGP)

abstract:
  In this proceedings, we briefly review the methodology from [arXiv:0801.1665]
for quantitatively constraining theoretical model parameters from experimental
measurements including statistical and systematic uncertainties. We extend this
methodology to additional parton energy-loss calculations for single inclusive
high pT particle suppression, and also extend the comparisons to di-jet
observations. This is only the start of a process to give quantitative
constraints on the quark-gluon plasma, and substantial theoretical
uncertainties need to be reduced/resolved in a parallel path.


title: Agents for Traffic Simulation

abstract:
  Vehicular traffic is a classical example of a multi-agent system in which
autonomous drivers operate in a shared environment. The article provides an
overview of the state-of-the-art in microscopic traffic modeling and the
implications for simulation techniques. We focus on the short-time dynamics of
car-following models which describe continuous feedback control tasks
(acceleration and braking) and models for discrete-choice tasks as a response
to the surrounding traffic. The driving style of an agent is characterized by
model parameters such as reaction time, desired speed, desired time gap,
anticipation etc. In addition, internal state variables corresponding to the
agent's "mind" are used to incorporate the driving experiences. We introduce a
time-dependency of some parameters to describe the frustration of drivers being
in a traffic jam for a while. Furthermore, the driver's behavior is externally
influenced by the neighboring vehicles and also by environmental input such as
limited motorization and braking power, visibility conditions and road traffic
regulations. A general approach for dealing with discrete decision problems in
the context of vehicular traffic is introduced and applied to mandatory and
discretionary lane changes. Furthermore, we consider the decision process
whether to brake or not when approaching a traffic light turning from green to
amber. Another aspect of vehicular traffic is related to the heterogeneity of
drivers. We discuss a hybrid system of coupled vehicle and information flow
which can be used for developing and testing applications of upcoming
inter-vehicle communication techniques.


title: Josephson Effect through an isotropic magnetic molecule

abstract:
  We investigate the Josephson effect through a molecular quantum dot magnet
connected to superconducting leads. The molecule contains a magnetic atom,
whose spin is assumed to be isotropic. It is coupled to the electron spin on
the dot via exchange coupling. Using the numerical renormalization group method
we calculate the Andreev levels and the supercurrent and examine intertwined
effect of the exchange coupling, Kondo correlation, and superconductivity on
the current. Exchange coupling typically suppresses the Kondo correlation so
that the system undergoes a phase transition from 0 to $\pi$ state as the
modulus of exchange coupling increases. Antiferromagnetic coupling is found to
drive exotic transitions: the reentrance to the $\pi$ state for a small
superconducting gap and the restoration of 0 state for large antiferromagnetic
exchange coupling. We suggest that the asymmetric dependence of supercurrent on
the exchange coupling could be used as to detect its sign in experiments.


title: Electronic structure near the 1/8-anomaly in La-based cuprates

abstract:
  We report an angle resolved photoemission study of the electronic structure
of the pseudogap state in \NdLSCO ($T_c<7$ K). Two opposite dispersing Fermi
arcs are the main result of this study. The several scenarios that can explain
this observation are discussed.