title:
Cascade of Phase Shifts and Creation of Nonlinear Focal Points for
  Supercritical Semiclassical Hartree Equation

abstract:
  We consider the semiclassical limit of the Hartree equation with a data
causing a focusing at a point. We study the asymptotic behavior of phase
function associated with the WKB approximation near the caustic when a
nonlinearity is supercritical. In this case, it is known that a phase shift
occurs in a neighborhood of focusing time in the case of focusing cubic
nonlinear Schr\"odinger equation. Thanks to the smoothness of the nonlocal
nonlinearities, we justify the WKB-type approximation of the solution for a
data which is larger than in the previous results and is not necessarily
well-prepared. We also show by an analysis of the limit hydrodynamical equaiton
that, however, this WKB-type approximation breaks down before reaching the
focal point: Nonlinear effects lead to the formation of singularity of the
leading term of the phase function.


title: On phase transition signal in inelastic collision

abstract:
  The paper is devoted to retrieval of the first order phase transition signal
in the inelastic collisions. The primary intent is to show that the
experimentally observable signal exist iff the multiplicity is sufficiently
large. We discuss corresponding phenomenology from point of view of the
experiment.


title:
On Fano manifolds with a birational contraction sending a divisor to a
  curve

abstract:
  Let X be a smooth Fano variety of dimension at least 4. We show that if X has
an elementary birational contraction sending a divisor to a curve, then the
Picard number of X is smaller or equal to 5.


title: Single spin asymmetry and five-quark components of the proton

abstract:
  We examine the single-spin asymmetry (SSA) caused by the five-quark
components of the proton for semi-inclusive electroproduction of charged pions
in deep-inelastic scattering on a transversely polarized hydrogen target. The
large SSA is considered to have close relation with quark orbital motion in the
proton and suggests that the quark orbital angular momentum is nonzero. For the
five-quark $qqqq\bar{q}$ components of the proton, the lowest configurations
with $qqqq$ system orbitally excited and the $\bar{q}$ in the ground state
would give spin-orbit correlations naturally for the quarks in a polarized
proton. We show that based on the basic reaction $\gamma q \to \pi q'$, the
orbital-spin coupling of the probed quarks in the five-quark configuration
leads to the single-spin asymmetry consistent with recent experiment results.


title: Exact solutions of f(R) gravity coupled to nonlinear electrodynamics

abstract:
  In this work, exact solutions of static and spherically symmetric space-times
are analyzed in f(R) modified theories of gravity coupled to nonlinear
electrodynamics. Firstly, we restrict the metric fields to one degree of
freedom, considering the specific case of g_tt\g_rr = -1. Using the dual P
formalism of nonlinear electrodynamics an exact general solution is deduced in
terms of the structural function H_P. In particular, specific exact solutions
to the gravitational field equations are found, confirming previous results and
new pure electric field solutions are found. Secondly, motivated by the
existence of regular electric fields at the center, and allowing for the case
of g_tt\g_rr \= -1, new specific solutions are found. Finally, we outline
alternative approaches by considering the specific case of constant curvature,
followed by the analysis of a specific form for f(R).


title: Floer homology and existence of incompressible tori in homology spheres

abstract:
  We show that if a prime homology sphere has the same Floer homology as the
standard three-sphere, it does not contain any incompressible tori.


title: Local rigidity of quasi-regular varieties

abstract:
  For a $G$-variety $X$ with an open orbit, we define its boundary $\partial X$
as the complement of the open orbit. The action sheaf $S_X$ is the subsheaf of
the tangent sheaf made of vector fields tangent to $\partial X$. We prove, for
a large family of smooth spherical varieties, the vanishing of the cohomology
groups $H^i(X,S_X)$ for $i>0$, extending results of F. Bien and M. Brion.
  We apply these results to study the local rigidity of the smooth projective
varieties with Picard number one classified in a previous paper of the first
author.


title:
Avatar Mobility in Networked Virtual Environments: Measurements,
  Analysis, and Implications

abstract:
  We collected mobility traces of 84,208 avatars spanning 22 regions over two
months in Second Life, a popular networked virtual environment. We analyzed the
traces to characterize the dynamics of the avatars mobility and behavior, both
temporally and spatially. We discuss the implications of the our findings to
the design of peer-to-peer networked virtual environments, interest management,
mobility modeling of avatars, server load balancing and zone partitioning,
client-side caching, and prefetching.


title: In-medium QCD and Cherenkov gluons vs Mach waves at LHC

abstract:
  The equations of in-medium gluodynamics are proposed. Their classical lowest
order solution is explicitly shown for a color charge moving with constant
speed. For nuclear permittivity larger than 1 it describes the shock wave
induced by emission of Cherenkov gluons. Specific effects at LHC energies are
described and compared with Mach wave predictions.


title:
Optimal Acyclic Hamiltonian Path Completion for Outerplanar Triangulated
  st-Digraphs (with Application to Upward Topological Book Embeddings)

abstract:
  Given an embedded planar acyclic digraph G, we define the problem of "acyclic
hamiltonian path completion with crossing minimization (Acyclic-HPCCM)" to be
the problem of determining an hamiltonian path completion set of edges such
that, when these edges are embedded on G, they create the smallest possible
number of edge crossings and turn G to a hamiltonian digraph. Our results
include:
  --We provide a characterization under which a triangulated st-digraph G is
hamiltonian.
  --For an outerplanar triangulated st-digraph G, we define the st-polygon
decomposition of G and, based on its properties, we develop a linear-time
algorithm that solves the Acyclic-HPCCM problem with at most one crossing per
edge of G.
  --For the class of st-planar digraphs, we establish an equivalence between
the Acyclic-HPCCM problem and the problem of determining an upward 2-page
topological book embedding with minimum number of spine crossings. We infer
(based on this equivalence) for the class of outerplanar triangulated
st-digraphs an upward topological 2-page book embedding with minimum number of
spine crossings and at most one spine crossing per edge.
  To the best of our knowledge, it is the first time that edge-crossing
minimization is studied in conjunction with the acyclic hamiltonian completion
problem and the first time that an optimal algorithm with respect to spine
crossing minimization is presented for upward topological book embeddings.


title: Small cosmological signatures from multi-brane models

abstract:
  We analyse the signatures of brane inflation models with moduli
stabilisation. These are hybrid inflation models with a non-trivial field-space
metric which can induce complex trajectories for the fields during inflation.
This in turn could lead to observable features on the power spectrum of the CMB
fluctuations through departures from near scale invariance or the presence of
isocurvature modes. We look specifically at multi-brane models in which the
volume modulus also evolves. We find that the signatures are highly sensitive
to the actual trajectories in field space, but their amplitudes are too small
to be observable even for future high precision CMB experiments.


title: Process of "Primoverization" of Numbers of the Form a^n-1

abstract:
  We call an integer N>1 primover to base a if it either prime or
overpseudoprime to base a. We prove, in particular, that every Fermat number is
primover to base 2. We also indicate a simple process of receiving of primover
divisors of numbers of the form a^n-1.


title: Three-Nucleon Continuum by means of the Hyperspherical Adiabatic Method

abstract:
  This paper investigates the possible use of the Hyperspherical Adiabatic
basis in the description of scattering states of a three-body system. In
particular, we analyze a 1+2 collision process below the three-body breakup.
The convergence patterns for the observables of interest are analyzed by
comparison to a unitary equivalent Hyperspherical Harmonic expansion.
Furthermore, we compare and discuss two different possible choices for
describing the asymptotic configurations of the system, related to the use of
Jacobi or hyperspherical coordinates. In order to illustrate the difficulties
and advantages of the approach two simple numerical applications are shown in
the case of neutron-deuteron scattering at low energies using s-wave
interactions. We found that the optimization driven by the Hyperspherical
Adiabatic basis is not as efficient for scattering states as in bound state
applications.


title: The mass content of the Sculptor dwarf spheroidal galaxy

abstract:
  We present a new determination of the mass content of the Sculptor dwarf
spheroidal galaxy, based on a novel approach which takes into account the two
distinct stellar populations present in this galaxy. This method helps to
partially break the well-known mass-anisotropy degeneracy present in the
modelling of pressure-supported stellar systems.


title:
$(Z\alpha)^{4}$ order of the polarization operator in Coulomb field at
  low energy

abstract:
  We derive the low-energy expansion of $(Z\alpha) ^{2}$ and $(Z\alpha) ^{4}$
terms of the polarization operator in the Coulomb field. Physical applications
such as the low-energy Delbr\"{u}ck scattering and "magnetic loop" contribution
to the $g$ factor of the bound electron are considered.


title: NEMO 3 double beta decay experiment: latest results

abstract:
  The double beta decay experiment NEMO~3 has been taking data since February
2003. The aim of this experiment is to search for neutrinoless decay and
investigate two neutrino double beta decay in seven different enriched isotopes
($^{100}$Mo,$^{82}$Se, $^{48}$Ca, $^{96}$Zr, $^{116}$Cd, $^{130}$Te and
$^{150}$Nd). After analysis of the data corresponding to 693 days, no evidence
for $0\nu\beta\beta$ decay in $^{100}$Mo and $^{82}$Se was found. The half-life
limits at 90% C.L. are $5.8\cdot 10^{23}$ y and $2.1\cdot 10^{23}$ y,
respectively. Using $\sim$ 940 days of data, preliminary results were obtained
for $^{48}$Ca, $^{96}$Zr and $^{150}$Nd. For two neutrino decay half-life
values were measured, $T_{1/2}(^{48}{\rm Ca}) = [4.4^{+0.5}_{-0.4}(stat) \pm
0.4(syst)] \cdot 10^{19}$ y, $T_{1/2}(^{96}{\rm Zr}) = [2.3 \pm 0.2(stat) \pm
0.3(syst)] \cdot 10^{19}$ y and $T_{1/2}(^{150}{\rm Nd}) =
[9.2^{+0.25}_{-0.22}(stat) \pm 0.62(syst)] \cdot 10^{18}$ y. Also for
$0\nu\beta\beta$ decay the following limits at 90% C.L. were obtained, $> 1.3
\cdot 10^{22}$ y for $^{48}$Ca, $> 8.6 \cdot 10^{21}$ y for $^{96}$Zr and > 1.8
\cdot 10^{22}$ y for $^{150}$Nd.


title: AdS black holes as reflecting cavities

abstract:
  We use the identification between null singularities of correlators in the
bulk with time singularities in the boundary correlators to study the analytic
structure of time-dependent thermal Green functions using the eikonal
approximation for classical solutions in the AdS black hole background. We show
that the location of singularities in complex time can be understood in terms
of null rays bouncing on the boundaries and singularities of the eternal black
hole, giving the picture of a `reflecting cavity'. We can then extract the
general analytic expression for the asymptotic values of the frequencies of
quasinormal modes in large AdS black holes.


title: Linear Quantum Feedback Networks

abstract:
  The mathematical theory of quantum feedback networks has recently been
developed for general open quantum dynamical systems interacting with bosonic
input fields. In this article we show, for the special case of linear dynamical
systems Markovian systems with instantaneous feedback connections, that the
transfer functions can be deduced and agree with the algebraic rules obtained
in the nonlinear case. Using these rules, we derive the the transfer functions
for linear quantum systems in series, in cascade, and in feedback arrangements
mediated by beam splitter devices.


title: Magnons and BFKL

abstract:
  We extract from the double logarithmic contributions to DGLAP anomalous
dimensions for twist-two operators up to three-loops the magnon dispersion
relation for planar N=4 supersymmetric Yang-Mills. Perturbatively the magnon
dispersion relation agrees with the expansion of the anomalous dimension for
spin-one as well as with the non-collinear double logarithmic contributions to
the BFKL anomalous dimensions analytically extended to negative spin. The
all-loop expression for the magnon dispersion relation is determined by the
double logarithmic resummation of the corresponding Bethe-Salpeter equation. A
potential map relating the spin chain magnon to BFKL eigenfunctions in the
double logarithm approximation is suggested.


title: Dynamical evolution of the young stars in the Galactic center

abstract:
  Recent observations of the Galactic center revealed a nuclear disk of young
OB stars near the massive black hole (MBH), in addition to many similar
outlying stars with higher eccentricities and/or high inclinations relative to
the disk (some of them possibly belonging to a second disk). In addition,
observations show the existence of young B stars (the 'S-cluster') in an
isotropic distribution in the close vicinity of the MBH ($<0.04$ pc). We use
extended N-body simulations to probe the dynamical evolution of these two
populations. We show that the stellar disk could have evolved to its currently
observed state from a thin disk of stars formed in a gaseous disk, and that the
dominant component in its evolution is the interaction with stars in the cusp
around the MBH. We also show that the currently observed distribution of the
S-stars could be consistent with a capture origin through 3-body binary-MBH
interactions. In this scenario the stars are captured at highly eccentric
orbits, but scattering by stellar black holes could change their eccentricity
distribution to be consistent with current observations.


title:
Spin, charge and single-particle spectral functions of the
  one-dimensional quarter filled Holstein model

abstract:
  We use a recently developed extension of the weak coupling diagrammatic
determinantal quantum Monte Carlo method to investigate the spin, charge and
single particle spectral functions of the one-dimensional quarter-filled
Holstein model with phonon frequency $\omega_0 = 0.1 t$. As a function of the
dimensionless electron-phonon coupling we observe a transition from a Luttinger
to a Luther-Emery liquid with dominant $2k_f$ charge fluctuations. Emphasis is
placed on the temperature dependence of the single particle spectral function.
At high temperatures and in both phases it is well accounted for within a
self-consistent Born approximation. In the low temperature Luttinger liquid
phase we observe features which compare favorably with a bosonization approach
retaining only forward scattering. In the Luther-Emery phase, the spectral
function at low temperatures shows a quasiparticle gap which matches half the
spin gap whereas at temperatures above which this quasiparticle gap closes,
characteristic features of the Luttinger liquid model are apparent. Our results
are based on lattice simulations on chains up to L=20 for two-particle
properties and on CDMFT calculations with clusters up to 12 sites for the
single-particle spectral function.


title: Dynamics of dissipative coupled spins: decoherence and relaxation

abstract:
  We study the reduced dynamics of interacting spins, each coupled to its own
bath of bosons. We derive the solution in analytic form in the white-noise
limit and analyze the rich behaviors in diverse limits ranging from weak
coupling and/or low temperature to strong coupling and/or high temperature. We
also view the one spin as being coupled to a spin-boson environment and
consider the regimes in which it is effectively nonlinear, and in which it can
be regarded as a resonant bosonic environment.


title:
Unified description of equation of state and transport properties of
  nuclear matter

abstract:
  Correlated basis function perturbation theory and the formalism of cluster
expansions have been recently employed to obtain an effective interaction from
a state-of-the-art nucleon nucleon potential model. The approach based on the
effective interaction allows for a consistent description of the nuclear matter
ground state and nucleon-nucleon scattering in the nuclear medium. This paper
reports the the results of numerical calculations of different properties of
nuclear and neutron matter, including the equation of state and the shear
viscosity and thermal conductivity transport coefficients, carried out using
the effective interaction.


title: On the stratified vector bundles

abstract:
  The stratified vector bundles on a smooth variety defined over an
algebraically closed field $k$ form a neutral Tannakian category over $k$. We
investigate the affine group--scheme corresponding to this neutral Tannakian
category.


title: Computing faithful representations for nilpotent Lie algebras

abstract:
  We describe three methods to determine a faithful representation of small
dimension for a finite-dimensional nilpotent Lie algebra over an arbitrary
field. We apply our methods in finding bounds for the smallest dimension
$\mu(\Lg)$ of a faithful $\Lg$-module for some nilpotent Lie algebras $\Lg$. In
particular, we describe an infinite family of filiform nilpotent Lie algebras
$\Lf_n$ of dimension $n$ over $\Q$ and conjecture that $\mu(\Lf_n) > n+1$.
Experiments with our algorithms suggest that $\mu(\Lf_n)$ is polynomial in $n$.


title: Inflationary scenario in the supersymmetric economical 3-3-1 model

abstract:
  We construct the supersymmetric economical 3-3-1 model which contains
inflationary scenario and avoids the monopole puzzle. Based on the spontaneous
symmetry breaking pattern (with three steps), the $F$-term inflation is
derived. The slow-roll parameters $\ep$ and $\eta$ are calculated. By imposing
as experimental five-year WMAP data on the spectral index $n$, we have derived
a constraint on the number of e-folding $N_Q$ to be in the range from 25 to 50.
The scenario for large-scale structure formation implied by the model is a
mixed scenario for inflation and cosmic string, and the contribution to the
CMBR temperature anisotropy depends on the ratio $\frac{M_X}{M_P}$. From the
COBE data, we have obtained the constraint on the $M_X$ to be $M_X\in[1.22
\times 10^{16} - 0.98 \times 10^{17}]$ GeV. The upper value $M_X\simeq 10^{17}$
GeV is a result of the analysis in which the inflationary contribution to the
temperature fluctuations measured by the COBE is 90%. The coupling $\alpha$
varies in the range: $ 10^{-7} - 10^{-1} $. This value is not so small, and it
is a common characteristics of the supersymmetric unified models with the
inflationary scenario. The spectral index $n$ is a little bit smaller than
0.98. The SUGRA corrections are slightly different from the previous
consideration. When $\xi \ll 1$ and $ \al $ lies in the above range, the
spectral index gets the value consistent with the experimental five-year WMAP
data. Comparing with string theory, one gets $\xi < 10^{-8}$. Numerical
analysis shows that $ \al \approx 10^{-6}$. To get inflation contribution to
the CMBR temperature anisotropy $\approx 90%$, the mass scale $M_X \sim 3.5
\times 10^{14}$ GeV.


title: Cavity Opto-Mechanics with a Bose-Einstein Condensate

abstract:
  Cavity opto-mechanics studies the coupling between a mechanical oscillator
and a cavity field, with the aim to shed light on the border between classical
and quantum physics. Here we report on a cavity opto-mechanical system in which
a collective density excitation of a Bose-Einstein condensate is shown to serve
as the mechanical oscillator coupled to the cavity field. We observe that a few
photons inside the ultrahigh-finesse cavity trigger a strongly driven
back-action dynamics, in quantitative agreement with a cavity opto-mechanical
model. With this experiment we approach the strong coupling regime of cavity
opto-mechanics, where a single excitation of the mechanical oscillator
significantly influences the cavity field. The work opens up new directions to
investigate mechanical oscillators in the quantum regime and quantum gases with
non-local coupling.


title: Precision shooting: Sampling long transition pathways

abstract:
  The kinetics of collective rearrangements in solution, such as protein
folding and nanocrystal phase transitions, often involve free energy barriers
that are both long and rough. Applying methods of transition path sampling to
harvest simulated trajectories that exemplify such processes is typically made
difficult by a very low acceptance rate for newly generated trajectories. We
address this problem by introducing a new generation algorithm based on the
linear short-time behavior of small disturbances in phase space. Using this
``precision shooting'' technique, arbitrarily small disturbances can be
propagated in time, and any desired acceptance ratio of shooting moves can be
obtained. We demonstrate the method for a simple but computationally
problematic isomerization process in a dense liquid of soft spheres. We also
discuss its applicability to barrier crossing events involving metastable
intermediate states.


title: Large Deviations of the Front in a one dimensional model of $X+Y \to 2X$

abstract:
  We investigate the probabilities of large deviations for the position of the
front in a stochastic model of the reaction $X+Y \to 2X$ on the integer lattice
in which $Y$ particles do not move while $X$ particles move as independent
simple continuous time random walks of total jump rate $2$. For a wide class of
initial conditions, we prove that a large deviations principle holds and we
show that the zero set of the rate function is the interval $[0,v]$, where $v$
is the velocity of the front given by the law of large numbers. We also give
more precise estimates for the rate of decay of the slowdown probabilities. Our
results indicate a gapless property of the generator of the process as seen
from the front, as it happens in the context of nonlinear diffusion equations
describing the propagation of a pulled front into an unstable state.


title:
Bounds for Integral j -Invariants and Cartan Structures on Elliptic
  Curves

abstract:
  We bound the j -invariant of integral points on a modular curve in terms of
the congruence group defining the curve. We apply this to prove that the
modular curve Xsplit (p3) has no non-trivial rational point if p is a
sufficiently large prime number. Assuming the GRH, one can replace p3 by p2 .


title: Algebraic string bracket as a Poisson bracket

abstract:
  In this paper we construct a Lie algebra representation of the algebraic
string bracket on negative cyclic cohomology of an associative algebra with
appropriate duality. This is a generalized algebraic version of the main
theorem of [AZ] which extends Goldman's results using string topology
operations.The main result can be applied to the de Rham complex of a smooth
manifold as well as the Dolbeault resolution of the endomorphisms of a
holomorphic bundle on a Calabi-Yau manifold.


title: N=4 Super Yang-Mills from the Plane Wave Matrix Model

abstract:
  We propose a nonperturbative definition of N=4 super Yang-Mills (SYM). We
realize N=4 SYM on RxS^3 as the theory around a vacuum of the plane wave matrix
model. Our regularization preserves sixteen supersymmetries and the gauge
symmetry. We perform the 1-loop calculation to give evidences that the
superconformal symmetry is restored in the continuum limit.


title:
The complementarity of astrometric and radial velocity exoplanet
  observations - Determining exoplanet mass with astrometric snapshots

abstract:
  We obtain full information on the orbital parameters by combining radial
velocity and astrometric measurements by means of Bayesian inference. We sample
the parameter probability densities of orbital model parameters with a Markov
chain Monte Carlo (McMC) method in simulated observational scenarios to test
the detectability of planets with orbital periods longer than the observational
timelines. We show that, when fitting model parameters simultaneously to
measurements from both sources, it is possible to extract much more information
from the measurements than when using either source alone. We demonstrate this
by studying the orbit of recently found extra-solar planet HD 154345 b.


title: Theoretical cosmic Type Ia supernova rates

abstract:
  The aim of this work is the computation of the cosmic Type Ia supernova rates
at very high redshifts (z>2). We adopt various progenitor models in order to
predict the number of explosions in different scenarios for galaxy formation
and to check whether it is possible to select the best delay time distribution
model, on the basis of the available observations of Type Ia supernovae. We
also computed the Type Ia supernova rate in typical elliptical galaxies of
different initial luminous masses and the total amount of iron produced by Type
Ia supernovae in each case. It emerges that: it is not easy to select the best
delay time distribution scenario from the observational data and this is
because the cosmic star formation rate dominates over the distribution function
of the delay times; the monolithic collapse scenario predicts an increasing
trend of the SN Ia rate at high redshifts whereas the predicted rate in the
hierarchical scheme drops dramatically at high redshift; for the elliptical
galaxies we note that the predicted maximum of the Type Ia supernova rate
depends on the initial galactic mass. The maximum occurs earlier (at about 0.3
Gyr) in the most massive ellipticals, as a consequence of downsizing in star
formation. We find that different delay time distributions predict different
relations between the Type Ia supernova rate per unit mass at the present time
and the color of the parent galaxies and that bluer ellipticals present higher
supernova Type Ia rates at the present time.


title:
A fitter code for Deep Virtual Compton Scattering and Generalized Parton
  Distributions

abstract:
  We have developped a fitting code based on the leading-twist handbag Deep
Virtual Compton Scattering (DVCS) amplitude in order to extract the Generalized
Parton Distributions (GPD) information from DVCS observables in the valence
region. In a first stage, with simulations and pseudo-data, we show that the
full GPD information can be recovered from experimental data if enough
observables are measured. If only part of these observables are measured,
valuable information can still be extracted, certain observables being
particularly sensitive to certain GPDs. In a second stage, we make a practical
application of this code to the recent DVCS Jefferson Lab Hall A data from
which we can extract numerical constraints for the two $H$ GPD Compton Form
Factors.


title: Dark Energy and its Implications for Gravity

abstract:
  The cosmological constant is the most economical candidate for dark energy.
No other approach really alleviates the difficulties faced by the cosmological
constant because, in all other attempts to model the dark energy, one still has
to explain why the bulk cosmological constant (treated as a low-energy
parameter in the action principle) is zero. I argue that until the theory is
made invariant under the shifting of the Lagrangian by a constant, one cannot
obtain a satisfactory solution to the cosmological constant problem. This is
impossible in any generally covariant theory with the conventional low-energy
matter action, if the metric is varied in the action to obtain the field
equations. I review an alternative perspective in which gravity arises as an
emergent, long wavelength phenomenon and can be described in terms of an
effective theory using an action associated with null vectors in the spacetime.
This action is explicitly invariant under the shift of the energy momentum
tensor $T_{ab}\to T_{ab}+\Lambda g_{ab}$ and any bulk cosmological constant can
be gauged away. Such an approach seems to be necessary for addressing the
cosmological constant problem and can easily explain why its bulk value is
zero. I describe some possibilities for obtaining its observed value from
quantum gravitational fluctuations.


title: Temporal Graphs

abstract:
  We introduce the idea of temporal graphs, a representation that encodes
temporal data into graphs while fully retaining the temporal information of the
original data. This representation lets us explore the dynamic temporal
properties of data by using existing graph algorithms (such as shortest-path),
with no need for data-driven simulations. We also present a number of metrics
that can be used to study and explore temporal graphs. Finally, we use temporal
graphs to analyse real-world data and present the results of our analysis.


title: Polygon Exploration with Time-Discrete Vision

abstract:
  With the advent of autonomous robots with two- and three-dimensional scanning
capabilities, classical visibility-based exploration methods from computational
geometry have gained in practical importance. However, real-life laser scanning
of useful accuracy does not allow the robot to scan continuously while in
motion; instead, it has to stop each time it surveys its environment. This
requirement was studied by Fekete, Klein and Nuechter for the subproblem of
looking around a corner, but until now has not been considered in an online
setting for whole polygonal regions.
  We give the first algorithmic results for this important algorithmic problem
that combines stationary art gallery-type aspects with watchman-type issues in
an online scenario: We demonstrate that even for orthoconvex polygons, a
competitive strategy can be achieved only for limited aspect ratio A (the ratio
of the maximum and minimum edge length of the polygon), i.e., for a given lower
bound on the size of an edge; we give a matching upper bound by providing an
O(log A)-competitive strategy for simple rectilinear polygons, using the
assumption that each edge of the polygon has to be fully visible from some scan
point.


title:
Physical realization and possible identification of topological
  excitations in quantum Heisenberg anti-ferromagnet on a two dimensional
  lattice

abstract:
  Physical spin configurations corresponding to topological excitations,
expected to be present in the XY limit of a quantum spin 1/2 Heisenberg
anti-ferromagnet, are probed on a two dimensional square lattice . Quantum
vortices (anti-vortices) are constructed in terms of coherent staggered spin
field components, as limiting case of meronic (anti-meronic) configurations .
The crucial role of the associated Wess-Zumino-like (WZ-like) term is
highlighted in our procedure . The time evolution equation of coherent spin
fields used in this analysis is obtained by applying variational principle on
the quantum Euclidean action corresponding to the Heisenberg anti-ferromagnet
on lattice . It is shown that the WZ-like term can distinguish between vortices
and anti-vortices only in a charge sector with odd topological charges. Our
formalism is distinctly different from the conventional approach for the
construction of quantum vortices (anti-vortices) .


title: Separable Operations on Pure States

abstract:
  We show that the possible ensembles produced when a separable operation acts
on a single pure bipartite entangled state are completely characterized by a
majorization condition, a collection of inequalities for Schmidt coefficients,
which is identical to that already known for the particular case of local
operations and classical communication (LOCC). As a consequence, various known
results for LOCC, including some involving monotonicity of entanglement, can be
extended to the class of all separable operations.


title:
Thermal and non-thermal leptogenesis in different neutrino mass models
  with tribimaximal mixings

abstract:
  In the present work we study both thermal and non-thermal leptogenesis in all
neutrino mass models describing the presently available neutrino mass patterns.
We consider the Majorana CP violating phases coming from right-handed Majorana
mass matrices to estimate the baryon asymmetry of the universe, for different
neutrino mass models namely degenerate, inverted hierarchical and normal
hierarchical models, with tribimaximal mixings. Considering two possible
diagonal forms of Dirac neutrino mass matrix as either charged lepton or
up-quark mass matrix, the right-handed Majorana mass matrices are constructed
from the light neutrino mass matrix through the inverse seesaw formula. Only
the normal hierarchical model leads to the best predictions for baryon
asymmetry of the universe, consistent with observations in both thermal and
non-thermal leptogenesis scenario. The analysis though phenomenological may
serve as an additional information in the discrimination among the presently
available neutrino mass models.


title: Diffusion systems and heat equations on networks

abstract:
  A theoretical framework for sesquilinear forms defined on the direct sum of
Hilbert spaces is developed in the first part. Conditions for the boundedness,
ellipticity and coercivity of the sesquilinear form are proved. A criterion of
E.-M. Ouhabaz is used in order to prove qualitative properties of the abstract
Cauchy problem having as generator the operator associated with the
sesquilinear form. In the second part we analyze quantum graphs as a special
case of forms on subspaces of the direct sum of Hilbert spaces. First, we set
up a framework for handling quantum graphs in the case of infinite networks.
Then, the operator associated with such systems is identified and investigated.
Finally, we turn our attention to symmetry properties of the associated
parabolic problem and we investigate the connection with the physical concept
of a gauge symmetry.


title:
The growth rate of an entire function and the Hausdorff dimension of its
  Julia set

abstract:
  Let f be a transcendental entire function in the Eremenko-Lyubich class B. We
give a lower bound for the Hausdorff dimension of the Julia set of f that
depends on the growth of f. This estimate is best possible and is obtained by
proving a more general result concerning the size of the escaping set of a
function with a logarithmic tract.


title: Dynamical study of bare $\sigma$ pole with $1/N_c$ classifications

abstract:
  Systematic $1/N_c$ counting of correlators is performed to directly relate
quark-gluon dynamics to qualitatively different hadronic states order by order.
Both 2q and 4q correlators of $\sigma$ quanta are analyzed with $1/N_c$
separation of the instanton, glueball, and in particular, two meson scattering
states. The {\it bare} resonance pole with no mixing effects are studied with
the QCD sum rules (QSR). The bare mass relation for large $N_c$ mesons,
$m_{\rho}<m_{4q}^{I=J=0}<m_{2q}^{I=J=0}$, is derived. The firm theoretical
ground of the QSR at the leading $1/N_{c}$ analyses is also emphasized.


title: The height of random binary unlabelled trees

abstract:
  This extended abstract is dedicated to the analysis of the height of
non-plane unlabelled rooted binary trees. The height of such a tree chosen
uniformly among those of size $n$ is proved to have a limiting theta
distribution, both in a central and local sense. Moderate as well as large
deviations estimates are also derived. The proofs rely on the analysis (in the
complex plane) of generating functions associated with trees of bounded height.


title: Tau spin correlations and the anomalous magnetic moment

abstract:
  We show that the precise determination of the Tau magnetic properties is
possible in the next generation accelerators, specially at B/Flavour factories.
We define spin correlation observables suitable to extract the real part of the
magnetic form factor that, for the first time, will allow to test the standard
model-QED predictions. In particular, the predicted QED-dependence with both
the momentum transfer and the lepton mass can be precisely measured. Until now,
the most stringent bounds on the $\tau$ magnetic moment $a_\tau$ come from LEP
data with strong assumptions on the physics involved on the observed process.
In this paper, we find three different combinations of spin correlations of the
outgoing Taus that disentangle the magnetic moment form factor of the Tau
lepton in the electromagnetic vertex. These combinations of asymmetries also
get rid off the contributions coming from Z-mediating amplitudes to the defined
correlations. Using unpolarized electron beams and an integrated luminosity of
$15 \times 10^{18} b^{-1}$, the sensitivity to the $\tau$ magnetic moment form
factor is of the order $10^{-6}$. This sensitivity is two orders of magnitude
better than the present existing high- or low-energy bounds on the magnetic
moment and would allow its actual measurement with the precision of a few per
cent.


title:
Transitivity of codimension one Anosov actions of R^k on closed
  manifolds

abstract:
  In this paper, we define codimension one Anosov actions of $\RR^k, k\geq 2,$
on a closed connected orientable manifold $M$. We prove that if the ambient
manifold has dimension greater than $k+2$, then the action is topologically
transitive. This generalizes a result of Verjovsky for codimension one Anosov
flows.


title: Observing the Spontaneous Breakdown of Unitarity

abstract:
  During the past decade, the experimental development of being able to create
ever larger and heavier quantum superpositions has brought the discussion of
the connection between microscopic quantum mechanics and macroscopic classical
physics back to the forefront of physical research. Under equilibrium
conditions this connection is in fact well understood in terms of the mechanism
of spontaneous symmetry breaking, while the emergence of classical dynamics can
be described within an ensemble averaged description in terms of decoherence.
The remaining realm of individual-state quantum dynamics in the thermodynamic
limit was addressed in a recent paper proposing that the unitarity of quantum
mechanical time evolution in macroscopic objects may be susceptible to a
spontaneous breakdown. Here we will discuss the implications of this theory of
spontaneous unitarity breaking for the modern experiments involving truly
macroscopic Schrodinger cat states.


title: Superconductivity in the PbO-type Structure alpha-FeSe

abstract:
  The recent discovery of superconductivity with relatively high transition
temperature Tc in the layered iron-based quaternary oxypnictides La[ O1-xFx]
FeAs was a real surprise. The excitement generated can be seen by the number of
subsequent works published within a very short period of time. Although there
exists superconductivity in alloy that contains Fe element, LaOMPn (with M= Fe,
Ni; and Pn=P and As) is the first system where Fe-element plays the key role to
the occurrence of superconductivity. LaOMPn has a layered crystal structure
with an Fe-based plane. It is quite natural to ask whether there exists other
Fe based planar compounds that exhibit superconductivity. Here we report the
observation of superconductivity with zero resistance transition temperature at
8K in the PbO-type alpha-FeSe compound. Although FeSe has been studied quite
extensively, a key observation is that the clean superconducting phase exists
only in those samples prepared with intentional Se deficiency. What is truly
striking, is that this compound has the same, perhaps simpler, planar crystal
sublattice as the layered oxypnictides. Furthermore, FeSe is, compared with
LaOFeAs, much easier to handle and fabricate. In view of the abundance of
compounds with PbO type structure, this result opens a new route to the search
for unconventional superconductors.


title:
Complexity of comparing monomials and two improvements of the
  BM-algorithm

abstract:
  We give a new algorithm for merging sorted lists of monomials. Together with
a projection technique we obtain a new complexity bound for the BM-algorithm.


title: The type of the base ring associated to a transversal polymatroid

abstract:
  In this paper we determine the facets of the polyhedral cone generated by the
exponent set of the monomials defining the base ring associated to some
transversal polymatroid. We need the description of these facets to find the
canonical module of the base ring which is expressed in terms of the relative
interior of the cone. This would allow us to compute the $a$-invariant of those
base rings. The results presented were discovered by extensive computer algebra
experiments performed with {\it{Normaliz}} \cite{BK}.


title:
Physical and kinematical properties of the X-ray absorber in the broad
  absorption line quasar APM 08279+5255

abstract:
  We have re-analyzed the X-ray spectra of the gravitational lensed
high-redshift BAL QSO APM 08279+5255, observed with the XMM-Newton and Chandra
observatories. Previous studies (Hasinger et al. 2002; Chartas et al. 2002)
detected unusual, highly-ionized iron absorption features, but differed in
their interpretation of these features, regarding the kinematical and
ionization structure. We seek one physical model that can be successfully
applied to both observations. For the first time we have performed detailed
photoionization modeling on the X-ray spectrum of APM 08279+5255. The absorbing
gas in APM 08279+5255 can be represented by a two-absorbers model with column
densities N_H(1)~7x10^{22} cm^-2, N_H(2)~6x10^{22} cm^-2, and ionization
parameters logxi(1)~1.5 and logxi(2)~3, with one of them (the high-ionization
component) outflowing at v~0.18(\pm 0.01)c, carrying large amount of gas out of
the system. We find that the Chandra spectrum of APM 08279+5255 requires the
same Fe/O ratio overabundance (previously) indicated by the XMM-Newton
observation, showing that both absorber components underwent similar chemical
evolution and/or have similar origin.


title: Leptoquark on $P\to \ell^{+} \nu$, FCNC and LFV

abstract:
  Motivated by the disagreement between the experimental data and lattice
calculations on the decay constant of the $D_{s}$ meson, we investigate
leptoquark (LQ) contributions to the purely leptonic decays of a pseudoscalar
(P). We concentrate on the LQs which only couple to the second-generation
quarks before the electroweak symmetry breaking and we discuss in detail how
flavor symmetry breaking effects are brought into the extension of the standard
model after the spontaneous symmetry breaking. We find that the hermiticity of
fermion mass matrices can not only reproduce the correct
Cabibbo-Kobayashi-Maskawa and Maki-Nakagawa-Sakata matrices, but also reduce
the number of independent flavor mixing matrices and lead to
$V^{R}_{f}=V^{L}_{f}$ with $L(R)$ denoting the chirality of the f-type fermion.
Accordingly, it is found that the decays $D_{s,d}\to \ell^{+} \nu$, $B^{+}\to
\tau^{+} \nu$ and $B_c\to \ell^{+} \nu$ have a strong correlation in
parameters. We predict that the decay constant of the $B_c$ meson calculated by
the lattice could be less than the experimental data by 23%. Intriguingly, the
resultant upper limits of branching ratios for $D\to \mu^{+} \mu^{-}$ and
$\tau\to \mu (\pi^0, \eta, \eta', \rho, \omega)$ are found to be around $
5.1\times 10^{-7}$ and $(2.6, 1.5, 0.6, 7.4, 4.8)\times 10^{-8}$, which are
below and close to the current experimental upper bounds, respectively.


title: Trace formula for dieletric cavities : I. General properties

abstract:
  The construction of the trace formula for open dielectric cavities is
examined in detail. Using the Krein formula it is shown that the sum over
cavity resonances can be written as a sum over classical periodic orbits for
the motion inside the cavity. The contribution of each periodic orbit is the
product of the two factors. The first is the same as in the standard trace
formula and the second is connected with the product of reflection coefficients
for all points of reflection with the cavity boundary. Two asymptotic terms of
the smooth resonance counting function related with the area and the perimeter
of the cavity are derived. The coefficient of the perimeter term differs from
the one for closed cavities due to unusual high-energy asymptotics of the
$\mathbf{S}$-matrix for the scattering on the cavity. Corrections to the
leading semi-classical formula are briefly discussed. Obtained formulas agree
well with numerical calculations for circular dielectric cavities.


title: alpha particle momentum distributions from 12C decaying resonances

abstract:
  The computed $\alpha$ particle momentum distributions from the decay of
low-lying $^{12}$C resonances are shown. The wave function of the decaying
fragments is computed by means of the complex scaled hyperspherical adiabatic
expansion method. The large-distance part of the wave functions is crucial and
has to be accurately calculated. We discuss energy distributions, angular
distributions and Dalitz plots for the $4^+$, $1^+$ and $4^-$ states of
$^{12}$C.


title: Spectral analysis of deformed random networks

abstract:
  We study spectral behavior of sparsely connected random networks under the
random matrix framework. Sub-networks without any connection among them form a
network having perfect community structure. As connections among the
sub-networks are introduced, the spacing distribution shows a transition from
the Poisson statistics to the Gaussian orthogonal ensemble statistics of random
matrix theory. The eigenvalue density distribution shows a transition to the
Wigner's semicircular behavior for a completely deformed network. The range for
which spectral rigidity, measured by the Dyson-Mehta $\Delta_3$ statistics,
follows the Gaussian orthogonal ensemble statistics depends upon the
deformation of the network from the perfect community structure. The spacing
distribution is particularly useful to track very slight deformations of the
network from a perfect community structure, whereas the density distribution
and the $\Delta_3$ statistics remain identical to the undeformed network. On
the other hand the $\Delta_3$ statistics is useful for the larger deformation
strengths. Finally, we analyze the spectrum of a protein-protein interaction
network for Helicobacter, and compare the spectral behavior with those of the
model networks.


title: Shear Viscosity from AdS Born-Infeld Black Holes

abstract:
  We calculate the shear viscosity in the frame of AdS/CFT correspondence for
the field theory with a gravity dual of Einstein-Born-Infeld gravity. We find
that the ratio of $\eta/s$ is still the conjectured universal value $1/4\pi$ at
least up to the first order of the Born-Infeld parameter $1/b^2$.


title: Spectral Density of Sample Covariance Matrices of Colored Noise

abstract:
  We study the dependence of the spectral density of the covariance matrix
ensemble on the power spectrum of the underlying multivariate signal. The white
noise signal leads to the celebrated Marchenko-Pastur formula. We demonstrate
results for some colored noise signals.


title:
Excited-state spectroscopy of single NV defects in diamond using
  optically detected magnetic resonance

abstract:
  Using pulsed optically detected magnetic resonance techniques, we directly
probe electron-spin resonance transitions in the excited-state of single
Nitrogen-Vacancy color centers in diamond. Unambiguous assignment of excited
state fine structure is made, based on changes of NV defect photoluminescence
lifetime. This study provides significant insight into the structure of the
emitting 3E excited state, which is invaluable for the development of
diamond-based quantum information processing.


title: Boundedness of Schroedinger type propagators on modulation spaces

abstract:
  It is known that Fourier integral operators arising when solving
Schr\"odinger-type operators are bounded on the modulation spaces $\cM^{p,q}$,
for $1\leq p=q\leq\infty$, provided their symbols belong to the Sj\"ostrand
class $M^{\infty,1}$. However, they generally fail to be bounded on $\cM^{p,q}$
for $p\not=q$. In this paper we study several additional conditions, to be
imposed on the phase or on the symbol, which guarantee the boundedness on
$\cM^{p,q}$ for $p\not=q$, and between $\cM^{p,q}\to\cM^{q,p}$, $1\leq q<
p\leq\infty$. We also study similar problems for operators acting on Wiener
amalgam spaces, recapturing, in particular, some recent results for metaplectic
operators. Our arguments make heavily use of the uncertainty principle.


title:
Analyse des suites al\'eatoires engendr\'ees par des automates
  cellulaires et applications \`a la cryptographie

abstract:
  This paper considers interactions between cellular automata and cryptology.
It is known that non-linear elementary rule which is correlation-immune don't
exist. This results limits the use of cellular automata as pseudo-random
generators suitable for cryptographic applications. In addition, for this kind
of pseudo-random generators, a successful cryptanalysis was proposed by Meier
and Staffelbach. However, other ways to design cellular automata capable to
generate good pseudo-random sequences remain and will be discussed in the end
of this article.


title:
Revisiting the upper bounding process in a safe Branch and Bound
  algorithm

abstract:
  Finding feasible points for which the proof succeeds is a critical issue in
safe Branch and Bound algorithms which handle continuous problems. In this
paper, we introduce a new strategy to compute very accurate approximations of
feasible points. This strategy takes advantage of the Newton method for
under-constrained systems of equations and inequalities. More precisely, it
exploits the optimal solution of a linear relaxation of the problem to compute
efficiently a promising upper bound. First experiments on the Coconuts
benchmarks demonstrate that this approach is very effective.


title:
CPBVP: A Constraint-Programming Framework for Bounded Program
  Verification

abstract:
  This paper studies how to verify the conformity of a program with its
specification and proposes a novel constraint-programming framework for bounded
program verification (CPBPV). The CPBPV framework uses constraint stores to
represent the specification and the program and explores execution paths
nondeterministically. The input program is partially correct if each constraint
store so produced implies the post-condition. CPBPV does not explore spurious
execution paths as it incrementally prunes execution paths early by detecting
that the constraint store is not consistent. CPBPV uses the rich language of
constraint programming to express the constraint store. Finally, CPBPV is
parametrized with a list of solvers which are tried in sequence, starting with
the least expensive and less general. Experimental results often produce orders
of magnitude improvements over earlier approaches, running times being often
independent of the variable domains. Moreover, CPBPV was able to detect subtle
errors in some programs while other frameworks based on model checking have
failed.


title: Low frequency radio spectrum and spectral turnover of LS 5039

abstract:
  LS 5039, a possible black hole x-ray binary, was recently observed with Giant
Meterwave Radio Telescope. The observed spectrum presented here shows that the
spectrum is inverted at the low frequency. When combined with the archival data
with orbital phase similar to the present observations, it shows a clear
indication of a spectral turnover. The combined data are fitted with a broken
power-law and the break frequency signifies a possible spectral turnover of the
spectrum around 964 MHz. Truly simultaneous observations in radio wavelength
covering a wide range of frequencies are required to fix the spectrum and the
spectral turn over which will play a crucial role in developing a deeper
understanding of the radio emitting jet in LS 5039.


title: Normal mode analysis for scalar fields in BTZ black hole background

abstract:
  We analyze the possibility of inequivalent boundary conditions for a scalar
field propagating in the BTZ black hole space-time. We find that for certain
ranges of the black hole parameters, the Klein-Gordon operator admits a
one-parameter family of self-adjoint extensions. For this range, the BTZ
space-time is not quantum mechanically complete. We suggest a physically
motivated method for determining the spectra of the Klein-Gordon operator.


title: Holomorphic Superspace

abstract:
  We give a twisted holomorphic superspace description for the super-Yang-Mills
theory, using holomorphic and antiholomorphic decompositions of twisted
spinors. We consider the case of the N=1 super-Yang-Mills theory in four
dimensions. We solve the constraints in two different manners, without and with
a prepotential. This might have further application for an holomorphic
superspace description of N=1,d=10 theory. We also explain how the N=1 and N=2
holomorphic superspaces are related.


title:
Fast computation of magnetostatic fields by Non-uniform Fast Fourier
  Transforms

abstract:
  The bottleneck of micromagnetic simulations is the computation of the
long-ranged magnetostatic fields. This can be tackled on regular N-node grids
with Fast Fourier Transforms in time N logN, whereas the geometrically more
versatile finite element methods (FEM) are bounded to N^4/3 in the best case.
We report the implementation of a Non-uniform Fast Fourier Transform algorithm
which brings a N logN convergence to FEM, with no loss of accuracy in the
results.


title: Strictly singular non-compact diagonal operators on HI spaces

abstract:
  We construct a Hereditarily Indecomposable Banach space $\eqs_d$ with a
Schauder basis \seq{e}{n} on which there exist strictly singular non-compact
diagonal operators. Moreover, the space $\mc{L}_{\diag}(\eqs_d)$ of diagonal
operators with respect to the basis \seq{e}{n} contains an isomorphic copy of
$\ell_{\infty}(\N)$.


title: Chiral Partners in a Chirally Broken World

abstract:
  The isovector--vector and the isovector--axial-vector current are related by
a chiral transformation. These currents can be called chiral partners at the
fundamental level. In a world where chiral symmetry was not broken, the
corresponding current-current correlators would show the same spectral
information. In the real world chiral symmetry is spontaneously broken. A
prominent peak -- the rho-meson -- shows up in the vector spectrum (measured in
(e^+ e^-)-collisions and tau-decays). On the other hand, in the axial-vector
spectrum a broad bump appears -- the a_1-meson (also accessible in tau-decays).
It is tempting to call rho and a_1 chiral partners at the hadronic level.
Strong indications are brought forward that these ``chiral partners'' do not
only differ in mass but even in their nature: The rho-meson appears dominantly
as a quark-antiquark state with small modifications from an attractive
pion-pion interaction. The a_1-meson, on the other hand, can be understood as a
meson-molecule state mainly formed by the attractive interaction between pion
and rho-meson. A key issue here is that the meson-meson interactions are fixed
by chiral symmetry breaking. It is demonstrated that one can understand the
vector and the axial-vector spectrum very well within this interpretation. It
is also shown that the opposite cases, namely rho as a pion-pion molecule or
a_1 as a quark-antiquark state lead to less satisfying results. Finally
speculations on possible in-medium changes of hadron properties are presented.


title:
Using Tau Polarization to probe the Stau Co-annihilation Region of
  mSUGRA Model at LHC

abstract:
  The mSUGRA model predicts the polarization of the tau coming from the stau to
bino decay in the co-annihilation region to be +1. This can be exploited to
extract this soft tau signal at LHC and also to measure the tiny mass
differences between the stau and the bino LSP. Moreover this strategy will be
applicable for a wider class of bino LSP models, where the lighter stau has a
right component at least of similar size as the left.


title: Quark Gluon Bags as Reggeons

abstract:
  The influence of the medium dependent finite width of QGP bags on their
equation of state is analyzed within an exactly solvable model. It is argued
that the large width of the QGP bags not only explains the observed deficit in
the number of hadronic resonances, but also clarifies the reason why the heavy
QGP bags cannot be directly observed as metastable states in a hadronic phase.
The model allows us to estimate the minimal value of the width of QGP bags from
a variety of the lattice QCD data and get that the minimal resonance width at
zero temperature is about 600 MeV, whereas the minimal resonance width at the
Hagedorn temperature is about 2000 MeV. As shown these estimates are almost
insensitive to the number of the elementary degrees of freedom. The recent
lattice QCD data are analyzed and it is found that besides sigma T**4 term the
lattice QCD pressure contains T-linear and T**4 ln T terms in the range of
temperatures between 240 MeV and 420 MeV. The presence of the last term in the
pressure bears almost no effect on the width estimates. Our analysis shows that
at hight temperatures the average mass and width of the QGP bags behave in
accordance with the upper bound of the Regge trajectory asymptotics (the linear
asymptotics), whereas at low temperatures they obey the lower bound of the
Regge trajectory asymptotics (the square root one). Since the model explicitly
contains the Hagedorn mass spectrum, it allows us to remove an existing
contradiction between the finite number of hadronic Regge families and the
Hagedorn idea of the exponentially growing mass spectrum of hadronic bags.


title:
Saturated extensions, the attractors method and Hereditarily James Tree
  Space

abstract:
  In the present work we provide a variety of examples of HI Banach spaces
containing no reflexive subspace and we study the structure of their duals as
well as the spaces of their linear bounded operators. Our approach is based on
saturated extensions of ground sets and the method of attractors.


title: Photo-Solitonic Effect

abstract:
  We show that dark solitons in 1D Bose liquids may be created by absorption of
a single quanta of an external ac field, in a close analogy with the Einstein's
photoelectric effect. Similarly to the von Lenard's experiment with
photoexcited electrons, the external field's photon energy $\hbar\omega$ should
exceed a certain threshold. In our case the latter is given by the soliton
energy $\varepsilon_s(\hbar q)$ with the momentum $\hbar q$, where $q$ is
photon's wavenumber. We find the probability of soliton creation to have a
power-law dependence on the frequency detuning $\omega-\varepsilon_s/\hbar$.
This dependence is a signature of the quantum nature of the absorption process
and the orthogonality catastrophe phenomenon associated with it.


title:
Long range correlations and phase transition in non-equilibrium
  diffusive systems

abstract:
  We obtain explicit expressions for the long range correlations in the ABC
model and in diffusive models conditioned to produce an atypical current of
particles.In both cases, the two-point correlation functions allow to detect
the occurrence of a phase transition as they become singular when the system
approaches the transition.


title: Origin of the multiferroic spiral spin-order in the RMnO3 perovskites

abstract:
  The origin of the spiral spin-order in perovskite multiferroic manganites
$R$MnO$_{3}$ ($RE=$ Tb or Dy) is here investigated using a two $e_{\rm
g}$-orbitals double-exchange model. Our main result is that the experimentally
observed spiral phase can be stabilized by introducing a relatively weak
next-nearest-neighbor superexchange coupling ($\sim10%$ of the nearest-neighbor
superexchange). Moreover, the Jahn-Teller lattice distortion is also shown to
be essential to obtain a realistic spiral period. Supporting our conclusions,
the generic phase diagram of undoped perovskite manganites is obtained using
Monte Carlo simulations, showing phase transitions from the A-type
antiferromagnet, to the spiral phase, and finally to the E-type
antiferromagnet, with decreasing size of the $R$ ions. These results are
qualitatively explained by the enhanced relative intensity of the
superexchanges.


title:
A Poisson model for earthquake frequency uncertainties in seismic hazard
  analysis

abstract:
  Frequency-magnitude distributions, and their associated uncertainties, are of
key importance in statistical seismology. When fitting these distributions, the
assumption of Gaussian residuals is invalid since event numbers are both
discrete and of unequal variance. In general, the observed number in any given
magnitude range is described by a binomial distribution which, given a large
total number of events of all magnitudes, approximates to a Poisson
distribution for a sufficiently small probability associated with that range.
In this paper, we examine four earthquake catalogues: New Zealand (Institute of
Geological and Nuclear Sciences), Southern California (Southern California
Earthquake Center), the Preliminary Determination of Epicentres and the Harvard
Centroid Moment Tensor (both held by the United States Geological Survey).
Using independent Poisson distributions to model the observations, we
demonstrate a simple way of estimating the uncertainty on the total number of
events occurring in a fixed time period.


title:
Wavefront correction with a ferrofluid deformable mirror: experimental
  results and recent developments

abstract:
  We present the research status of a deformable mirror made of a magnetic
liquid whose surface is actuated by a triangular array of small current
carrying coils. We demonstrate that the mirror can correct a 11 microns low
order aberrated wavefront to a residual RMS wavefront error 0.05 microns.
Recent developments show that these deformable mirrors can reach a frequency
response of several hundred hertz. A new method for linearizing the response of
these mirrors is also presented.


title:
Emission from Very Small Grains and PAH Molecules in Monte Carlo
  Radiation Transfer Codes: Application to the Edge-On Disk of Gomez's
  Hamburger

abstract:
  We have modeled optical to far infrared images, photometry, and spectroscopy
of the object known as Gomez's Hamburger. We reproduce the images and spectrum
with an edge-on disk of mass 0.3M_sun and radius 1600AU, surrounding an A0 III
star at a distance of 280pc. Our mass estimate is in excellent agreement with
recent CO observations. However, our distance determination is more than an
order of magnitude smaller than previous analyses which inaccurately
interpreted the optical spectrum. To accurately model the infrared spectrum we
have extended our Monte Carlo radiation transfer codes to include emission from
polycyclic aromatic hydrocarbon (PAH) molecules and very small grains (VSG). We
do this using pre-computed PAH/VSG emissivity files for a wide range of values
of the mean intensity of the exciting radiation field. When Monte Carlo energy
packets are absorbed by PAHs/VSGs we reprocess them to other wavelengths by
sampling from the emissivity files, thus simulating the absorption and
re-emission process without reproducing lengthy computations of statistical
equilibrium, excitation and de-excitation in the complex many level molecules.
Using emissivity lookup tables in our Monte Carlo codes gives the flexibility
to use the latest grain physics calculations of PAH/VSG emissivity and opacity
that are being continually updated in the light of higher resolution infrared
spectra. We find our approach gives a good representation of the observed PAH
spectrum from the disk of Gomez's Hamburger. Our models also indicate the
PAHs/VSGs in the disk have a larger scaleheight than larger radiative
equilibrium grains, providing evidence for dust coagulation and settling to the
midplane.


title:
Phenomenological Landau analysis of predicted magnetoelectric fluorides:
  KMnFeF$_{6}$ and Ba$_{2}$Ni$_{7}$F$_{18}$

abstract:
  Recently, we predicted based on symmetry considerations that KMnFeF$_{6}$ and
Ba$_{2}$Ni$_{7}$F$_{18}$ are likely magnetoelectric multiferroic materials. In
this contribution, we investigate with Landau theory and crystal structure
considerations the polarization and the linear magnetoelectric effect in these
materials. Based on these two examples, we show that any magnetoferroelectric
will display additional electrical polarization below its magnetic ordering
temperature. This additional electrical polarization is not related to the
linear magnetoelectric effect. Its magnitude depends on the dielectric
susceptibility.


title:
Gravitational wave data analysis implications of TaylorEt inspiral
  approximants for ground-based detectors: the non-spinning case

abstract:
  A new family of restricted post-Newtonian-accurate waveforms, termed TaylorEt
approximants, was recently proposed for searching gravitational wave (GW)
signals from inspiraling non-spinning compact binaries having arbitrary
mass-ratios. We perform detailed fitting factor (FF) studies to probe if the
TaylorEt (3.5PN) signals for non-spinning comparable mass compact binaries can
be effectually and faithfully searched with TaylorT1, TaylorT4, and TaylorF2
(3.5PN) templates in LIGO, Advanced LIGO, and Virgo interferometers. We observe
that a good fraction of the templates, which by choice are from TaylorT1,
TaylorT4, and TaylorF2 (3.5PN) families, have FF <~ 0.97 and substantial biases
for the estimated total-mass against the fiducial TaylorEt (3.5PN) signals for
equal-mass systems. Both these observations can bear on the detectability of a
signal. TaylorEt (3.5PN) signals with mass-ratios of a third or a quarter yield
high FFs against those same template banks, but at the expense of inviting
large systematic errors in the estimated values of their total mass and
symmetric mass-ratio. In general, the aforementioned templates are found to be
increasingly {\it unfaithful} with respect to a TaylorEt signal as one
increases the total mass of the inspiraling system. We also observe that the
amount of bias in the estimated mass varies with the (noise power spectral
density of the) detector. This can be of some concern for multi-detector
searches, which check for consistency in the estimated masses of concurrent
triggers in their data. (Abridged)


title:
Imaging Flux Vortices in Type II Superconductors with a Commercial
  Transmission Electron Microscope

abstract:
  Flux vortices in superconductors can be imaged using transmission electron
microscopy because the electron beam is deflected by the magnetic flux
associated with the vortices. This technique has a better spatial and temporal
resolution than many other imaging techniques and is sensitive to the magnetic
flux density within each vortex not simply the fields at the sample surface.
Despite these advantages, only two groups have successfully employed the
technique using specially adapted instruments. Here we demonstrate that
vortices can be imaged with a modern, commercial transmission electron
microscope operating at 300 kV equipped with a field emission gun, Lorentz lens
and a liquid helium cooled sample holder. We introduce superconductivity for
non-specialists and discuss techniques for simulating and optimising images of
flux vortices. Sample preparation is discussed in detail as the requirement for
samples with very large (>10um), flat areas so that the image is not dominated
by diffraction contrast is the main difficulty with the technique. We have
imaged vortices in superconducting Bi2Sr2CaCu2O8+d and use correlation
functions to investigate the ordered arrangements they adopt as a function of
applied magnetic field.


title:
Gamow-Teller strengths in 24Na using the 24Mg(t,3He) reaction at 115
  AMeV

abstract:
  Gamow-Teller transitions from 24Mg to 24Na were studied via the (t,3He)
reaction at 115 AMeV using a secondary triton beam produced via fast
fragmentation of 150 AMeV 16O ions. Compared to previous (t,3He) experiments at
this energy that employed a primary alpha beam, the secondary beam intensity is
improved by about a factor of five. Despite the large emittance of the
secondary beam, an excitation-energy resolution of ~200 keV is achieved. A good
correspondence is found between the extracted Gamow-Teller strength
distribution and those available from other charge-exchange probes. Theoretical
calculations using the newly developed USDA and USDB sd-shell model
interactions reproduce the data well.


title: Valence quarks and $k_T$ factorisation

abstract:
  We study in the $k_T$ factorisation framework jet production at LHC energies.
In particular we are interested in valence quark and gluon initiated jets. The
calculation of the relevant hard matrix element is presented. A CCFM like
evolutionequation for valence quark distribution is solved and the cross
section for valence quark and gluon initiated process is calculated using Monte
Carlo event generator CASCADE.


title: Chandra X-Ray Observatory Observations of the Globular Cluster M71

abstract:
  We observed the nearby, low-density globular cluster M71 (NGC 6838) with the
Chandra X-ray Observatory to study its faint X-ray populations. Five X-ray
sources were found inside the cluster core radius, including the known
eclipsing binary millisecond pulsar (MSP) PSR J1953+1846A. The X-ray light
curve of the source coincident with this MSP shows marginal evidence for
periodicity at the binary period of 4.2 h. Its hard X-ray spectrum and
luminosity resemble those of other eclipsing binary MSPs in 47 Tuc, suggesting
a similar shock origin of the X-ray emission. A further 24 X-ray sources were
found within the half-mass radius, reaching to a limiting luminosity of 1.5
10^30 erg/s (0.3-8 keV). From a radial distribution analysis, we find that
18+/-6 of these 29 sources are associated with M71, somewhat more than
predicted, and that 11+/-6 are background sources, both galactic and
extragalactic. M71 appears to have more X-ray sources between L_X=10^30--10^31
erg/s than expected by extrapolating from other studied clusters using either
mass or collision frequency. We explore the spectra and variability of these
sources, and describe the results of ground-based optical counterpart searches.


title:
Threshold resummation for squark-antisquark and gluino-pair production
  at the LHC

abstract:
  We study the effect of soft gluon emission in the hadroproduction of
squark-antisquark and gluino-gluino pairs at the next-to-leading logarithmic
(NLL) accuracy within the framework of the minimal supersymmetric model. The
one-loop soft anomalous dimension matrices controlling the colour evolution of
the underlying hard-scattering processes are calculated. We present the
resummed total cross sections and show numerical results for proton-proton
collisions at 14 TeV. The size of the NLL contribution to the cross section and
the reduction of the scale dependence of the theoretical predictions due to
including soft gluon effects are discussed.


title: On pointed Hopf algebras associated with the symmetric groups

abstract:
  It is an important open problem whether the dimension of the Nichols algebra
B(O,\rho) is finite when O is the class of the transpositions and \rho is the
sign representation, with m>= 6. In the present paper, we discard most of the
other conjugacy classes showing that very few pairs (O,\rho) might give rise to
finite-dimensional Nichols algebras.


title: First Result of Net-Charge Jet-Correlations from STAR

abstract:
  We presented results on azimuthal correlation of net-charge with high $p_T$
trigger particles. It is found that the net-charge correlation shape is similar
to that of total-charge. On the near-side, the net-charge and total-charge
$p_T$ spectra have similar shape and both are harder than the inclusives. On
the away-side, the correlated spectra are not much harder than the inclusives,
and the net-charge/total-charge ratio increases with $p_T$ and is similar to
the inclusive ratio.


title:
Measurement of Ratios of Branching Fractions and CP-Violating
  Asymmetries of B -> D*K Decays

abstract:
  We report a study of B -> D*K decays with D* decaying to D pi0 or D gamma,
using 383 * 10**6 B Bbar pairs collected at the Upsilon(4S) resonance with the
BaBar detector at the SLAC PEP-II B-Factory. The D meson decays under study
include a non-CP mode (Kpi), CP-even modes (K+K-, pi^+pi^-) and CP-odd modes
(KS pi0, KS phi, KS omega). We measure ratios (R*_{CP+-}) of branching
fractions of decays to CP eigenmode states and to flavor-specific states as
well as CP asymmetries (A*_{CP+-}). These measurements are sensitive to the
unitarity triangle angle gamma. We obtain A*_{CP+} = -0.11 pm 0.09 pm 0.01,
R*_{CP+} = ~1.31 pm 0.13 pm 0.04, and A*_{CP-} = 0.06 pm 0.10 pm 0.02, R*_{CP-}
= ~1.10 pm 0.12 pm 0.04, where the first error is statistical and the second
error is systematic. Translating our results into an alternative
parametrization, widely used for related measurements, we obtain x*_{+}=0.11 pm
0.06 pm 0.02 and x*_{-} = 0.00 pm 0.06 pm 0.02. No significant CP-violating
charge asymmetry is found in either the flavor-specific mode D -> K pi or in B
-> D* pi decays.


title:
Dispersive deformations of hydrodynamic reductions of 2D dispersionless
  integrable systems

abstract:
  We demonstrate that hydrodynamic reductions of dispersionless integrable
systems in 2+1 dimensions, such as the dispersionless Kadomtsev-Petviashvili
(dKP) and dispersionless Toda lattice (dTl) equations, can be deformed into
reductions of the corresponding dispersive counterparts. Modulo the Miura
group, such deformations are unique. The requirement that any hydrodynamic
reduction possesses a deformation of this kind imposes strong constraints on
the structure of dispersive terms, suggesting an alternative approach to the
integrability in 2+1 dimensions.


title: Softening of ultra-nanocrystalline diamond at low grain sizes

abstract:
  Ultra-nanocrystalline diamond is a polycrystalline material, having
crystalline diamond grains of sizes in the nanometer regime. We study the
structure and mechanical properties of this material as a function of the
average grain size, employing atomistic simulations. From the calculated
elastic constants and the estimated hardness, we observe softening of the
material as the size of its grains decreases. We attribute the observed
softening to the enhanced fraction of interfacial atoms as the average grain
size becomes smaller. We provide a fitting formula for the scaling of the
cohesive energy and bulk modulus with respect to the average grain size. We
find that they both scale as quadratic polynomials of the inverse grain size.
Our formulae yield correct values for bulk diamond in the limit of large grain
sizes.


title: Robustness of a Cellular Automata Model for the HIV Infection

abstract:
  An investigation was conducted to study the robustness of the results
obtained from the cellular automata model which describes the spread of the HIV
infection within lymphoid tissues [R. M. Zorzenon dos Santos and S. Coutinho,
Phys. Rev. Lett. 87, 168102 (2001)]. The analysis focussed on the dynamic
behavior of the model when defined in lattices with different symmetries and
dimensionalities. The results illustrated that the three-phase dynamics of the
planar models suffered minor changes in relation to lattice symmetry variations
and, while differences were observed regarding dimensionality changes,
qualitative behavior was preserved. A further investigation was conducted into
primary infection and sensitiveness of the latency period to variations of the
model's stochastic parameters over wide ranging values. The variables
characterizing primary infection and the latency period exhibited power-law
behavior when the stochastic parameters varied over a few orders of magnitude.
The power-law exponents were approximately the same when lattice symmetry
varied, but there was a significant variation when dimensionality changed from
two to three. The dynamics of the three-dimensional model was also shown to be
insensitive to variations of the deterministic parameters related to cell
resistance to the infection, and the necessary time lag to mount the specific
immune response to HIV variants. The robustness of the model demonstrated in
this work reinforce that its basic hypothesis are consistent with the
three-stage dynamic of the HIV infection observed in patients.

categories: physics.bio-ph physics.med-ph q-bio.CB q-bio.PE


title: Competing orders in FeAs layers

abstract:
  Using the unrestricted Hartree-Fock approximation and Landau theory we
identify possible phases competing with superconductivity in FeAs layers. We
find that close to half-filling the transition from the paramagnet to the
magnetically ordered phase is first-order making anharmonicities relevant and
leading to a rich phase diagram. Between the already known one dimensionally
modulated magnetic stripe phase and the paramagnet we find a new phase which
has the same structure factor as the former but in which magnetic moments at
nearest-neighbor sites are at right angles making electrons to acquire a non
trivial phase when circulating a plaquette at strong coupling. Another
competing phase has magnetic and charge order and may be stabilized by charged
impurities.


title:
A non-local hidden-variable model that violates Leggett-type
  inequalities

abstract:
  Recent experiments of Groeblacher et al. proved the violation of a
Leggett-type inequality that was claimed to be valid for a broad class of
non-local hidden-variable theories. The impossibility of constructing a
non-local and realistic theory, unless it entails highly counterintuitive
features, seems thus to have been experimentally proved. This would bring us
close to a definite refutation of realism. Indeed, realism was proved to be
also incompatible with locality, according to a series of experiments testing
Bell inequalities. The present paper addresses the said experiments of
Groeblacher et al. and presents an explicit, contextual and realistic, model
that reproduces the predictions of quantum mechanics. It thus violates the
Leggett-type inequality that was established with the aim of ruling out a
supposedly broad class of non-local models. We can thus conclude that plausible
contextual, realistic, models are still tenable. This restates the possibility
of a future completion of quantum mechanics by a realistic and contextual
theory which is not in a class containing only highly counterintuitive models.
The class that was ruled out by the experiments of Groeblacher et al. is thus
proved to be a limited one, arbitrarily separating models that physically
belong in the same class.


title: Constraints on Kinetically Modified Inflation from WMAP5

abstract:
  Single field inflationary models with a non-minimal kinetic term (also called
k-inflationary models) can be characterised by the so-called sound flow
functions, which complete the usual Hubble flow hierarchy. These parameters
appear in the primordial power spectra of cosmological perturbations at leading
order and, therefore, affect the resulting Cosmic Microwave Background (CMB)
anisotropies. Using the fifth year Wilkinson Microwave Anisotropy Probe (WMAP5)
data, we derive the marginalised posterior probability distributions for both
the sound and Hubble flow parameters. In contrast to the standard situation,
these parameters remain separately unbounded, and notably there is no longer
any upper limit on epsilon_1, the first Hubble flow function. Only special
combinations of these parameters, corresponding to the spectral index and
tensor-to-scalar ratio observables, are actually constrained by the data. The
energy scale of k-inflation is nevertheless limited from above to Hinf/mpl <
6x10^(-6) at two-sigma level. Moreover, for the sub-class of Dirac-Born-Infeld
models, by considering the non-gaussianity bounds on the sound speed, we find a
weak limit epsilon_1 < 0.08 at 95% confidence level.


title: Predict-prevent control method for perturbed excitable systems

abstract:
  We present a control method based on two steps: prediction and prevention.
For prediction we use the anticipated synchronization scheme, considering
unidirectional coupling between excitable systems in a master-slave
configuration. The master is the perturbed system to be controlled, meanwhile
the slave is an auxiliary system which is used to predict the master's
behavior. We demonstrate theoretically and experimentally that an efficient
control may be achieved.


title: Five models for myosin V

abstract:
  Myosin V was the first discovered processive motor from the myosin family. It
has therefore been subject of a number of mechanical, kinetic, optical and
structural studies and now belongs to the best characterised motor proteins.
This effort has been accompanied by a number of different theoretical models.
In this article we give an overview of them and discuss what they have in
common and where the open questions are. The latter include the existence of
sub-steps, the process that limits the run length, the nature of backward
steps, the flexibility of the lever arm and the state of the lead head.


title: Statistics of bubble rearrangement dynamics in a coarsening foam

abstract:
  We use speckle-visibility spectroscopy to measure the time-dependence of
bubble rearrangement events that are driven by coarsening in an aqueous foam.
This technique gives the time-trace for the average scattering site speed
within a prescribed volume of the sample. Results are analyzed in terms of
distributions of event times, event speeds, and event displacements. The
distribution of rest times between successive events is also measured;
comparison with diffusing-wave spectroscopy results shows that the spatial
structure of a typical event consists of a core of only a few bubbles which
undergo topology change plus a surrounding halo of bubbles which shift by an
amount that decays to one wavelength at four to five bubbles away. No
correlations are found between the durations, speeds, and rest times between
successive events.


title: Damped bounces of an isolated perfect quantum gas

abstract:
  The issue of the thermalization of an isolated quantum system is addressed by
considering a perfect gas confined by gravity and initially trapped above a
certain height. As we are interested in the behavior of truly isolated systems,
we assume the gas is in a pure state of macroscopically well-defined energy. We
show that, in general, for single-particle distributions, such a state is
strictly equivalent to the microcanonical mixed state at the same energy. We
derive an expression for the time-dependent gas density which depends on the
initial gas state only via a few thermodynamic parameters. Though we consider
non-interacting particles, the density relaxes into an asymptotic profile, but
which is not the thermal equilibrium one determined by the gas energy and
particle number.


title: Dyon dynamics near marginal stability and non-BPS states

abstract:
  We derive the general form of the moduli-space effective action for the
long-range interaction of two BPS dyons in N=2 gauge theories. This action
determines the bound state structure of various BPS and non-BPS states near
marginal stability curves, and we utilise it to compute the leading correction
to the BPS-mass of zero-torsion non-BPS bound states close to marginal
stability.


title: On rich lines in grids

abstract:
  In this paper we show that if one has a grid A x B, where A and B are sets of
n real numbers, then there can be only very few ``rich'' lines in certain quite
small families. Indeed, we show that if the family has lines taking on
n^epsilon distinct slopes, and where each line is parallel to n^epsilon others
(so, at least n^(2 epsilon) lines in total), then at least one of these lines
must fail to be ``rich''. This result immediately implies non-trivial
sum-product inequalities; though, our proof makes use of the Szemeredi-Trotter
inequality, which Elekes used in his argument for lower bounds on |C+C| +
|C.C|.


title: The One-Loop Five-Graviton Amplitude and the Effective Action

abstract:
  We consider the one-loop five-graviton amplitude in type II string theory
calculated in the light-cone gauge. Although it is not possible to explicitly
evaluate the integrals over the positions of the vertex operators, a low-energy
expansion can be obtained, which can then be used to infer terms in the
low-energy effective action. After subtracting diagrams due to known D^{2n}R^4
terms, we show the absence of one-loop R^5 and D^2R^5 terms and determine the
exact structure of the one-loop D^4R^5 terms where, interestingly, the
coefficient in front of the D^4R^5 terms is identical to the coefficient in
front of the D^6R^4 term. Finally, we show that, up to D^6R^4 ~ D^4R^5, the
\epsilon_{10} terms package together with the t_8 terms in the usual
combination (t_8t_8\pm{1/8}\epsilon_{10}\epsilon_{10}).


title:
Frustrated total internal reflection and the illusion of superluminal
  propagation

abstract:
  We analyze the propagation of a pulse across a vacuum gap separating opposite
flat parallel faces of two transparent dielectrics by means of an explicitly
causal and retarded propagator constructed directly from the free-space wave
equation. Nevertheless, our approach yields apparently superluminal propagation
for the case of frustrated total internal reflection (FTIR), that is, a
transmitted wave packet appears on the far side of the gap at the same time
that the corresponding incident packet crosses the front one. Thus, in this
example superluminality is just an illusion, being consistent with both
casuality and classical electrodynamics. We study the origin of the apparent
superluminality in this case, which is inherent to light pulse propagation in
free space and does not depend on the particulars of light-matter interaction,
and find that it is due to propagation from the lateral wings of the incident
pulse to the central part of the transmitted pulse. Thus, notwithstanding their
similarities, FTIR is not equivalent to 1D tunneling. We propose experiments to
test our explanation of superluminality using opaque screens to block part of
the wavefront, although we demonstrate that the propagation of smooth finite
pulses constrained to be made up completely of evanescent Fourier components is
indistinguishable from truly superluminal propagation, i.e., it may be
completely accounted for using an explicitely superluminal and acausal
propagator as well as the causal subluminal one.


title:
On the Two Species Asymmetric Exclusion Process with Semi-Permeable
  Boundaries

abstract:
  We investigate the structure of the nonequilibrium stationary state (NESS) of
a system of first and second class particles, as well as vacancies (holes), on
L sites of a one-dimensional lattice in contact with first class particle
reservoirs at the boundary sites; these particles can enter at site 1, when it
is vacant, with rate alpha, and exit from site L with rate beta. Second class
particles can neither enter nor leave the system, so the boundaries are
semi-permeable. The internal dynamics are described by the usual totally
asymmetric exclusion process (TASEP) with second class particles. An exact
solution of the NESS was found by Arita. Here we describe two consequences of
the fact that the flux of second class particles is zero. First, there exist
(pinned and unpinned) fat shocks which determine the general structure of the
phase diagram and of the local measures; the latter describe the microscopic
structure of the system at different macroscopic points (in the limit L going
to infinity in terms of superpositions of extremal measures of the infinite
system. Second, the distribution of second class particles is given by an
equilibrium ensemble in fixed volume, or equivalently but more simply by a
pressure ensemble, in which the pair potential between neighboring particles
grows logarithmically with distance. We also point out an unexpected feature in
the microscopic structure of the NESS for finite L: if there are n second class
particles in the system then the distribution of first class particles
(respectively holes) on the first (respectively last) n sites is exchangeable.


title:
Search for active neutrino disappearance using neutral-current
  interactions in the MINOS long-baseline experiment

abstract:
  We report the first detailed comparisons of the rates and spectra of
neutral-current neutrino interactions at two widely separated locations. A
depletion in the rate at the far site would indicate mixing between muon
neutirnos and a sterile particle. No anomalous depletion in the reconstructed
energy spectrum is observed. Assuming oscillations occur at a single
mass-squared splitting, a fit to the neutral- and charged-current energy
spectra limits the fraction of muon neutrino oscillating to a sterile neutrino
to be below 0.68 at 90% confidence level. A less stringent limit due to a
possible contribution to the measured neutral-current event rate at the far
site from electron neutrino appearance at the current experimental limit is
also presented.


title:
Domain-averaged Fermi hole versus regional reduced density matrices: a
  critical comparison

abstract:
  In their recent work Cooper and Ponec [Phys. Chem. Chem. Phys., 2008, 10,
1319-1329] proposed a ``one-electron approximation to domain-averaged Fermi
hole (DAFH)" used in electronic population studies. The goal of this comment is
to note that the proposal had been already published within the framework of
domain-restricted reduced density matrices ($\mathrm{\Omega}$-RDM) and to show
that it cannot conceptually be considered as an approximation to DAFH as the
authors invoke.


title: Finite temperature coherence of the ideal Bose gas in an optical lattice

abstract:
  In current experiments with cold quantum gases in periodic potentials,
interference fringe contrast is typically the easiest signal in which to look
for effects of non-trivial many-body dynamics. In order better to calibrate
such measurements, we analyse the background effect of thermal decoherence as
it occurs in the absence of dynamical interparticle interactions. We study the
effect of optical lattice potentials, as experimentally applied, on the
condensed fraction of a non-interacting Bose gas in local thermal equilibrium
at finite temperatures. We show that the experimentally observed decrease of
the condensate fraction in the presence of the lattice can be attributed, up to
a threshold lattice height, purely to ideal gas thermodynamics; conversely we
confirm that sharper decreases in first-order coherence observed in stronger
lattices are indeed attributable to many-body physics. Our results also suggest
that the fringe visibility 'kinks' observed in F.Gerbier et al., Phys. Rev.
Lett. 95, 050404 (2005) may be explained in terms of the competition between
increasing lattice strength and increasing mean gas density, as the gaussian
profile of the red-detuned lattice lasers also increases the effective strength
of the harmonic trap.


title: Detecting Flaring Structures in Sagittarius A* with (Sub)Millimeter VLBI

abstract:
  Multiwavelength monitoring observations of Sagittarius A* exhibit variability
on timescales of minutes to hours, indicating emission regions localized near
the event horizon. (Sub)Millimeter-wavelength VLBI is uniquely suited to probe
the environment of the assumed black hole on these scales. We consider a range
of orbiting hot-spot and accretion-disk models and find that periodicity in Sgr
A* flares is detectable using closure quantities. Our methods are applicable to
any model producing source structure changes near the black hole, including
jets and magnetohydrodynamic disk instabilities, and suggest that
(sub)millimeter VLBI will play a prominent role in investigating Sgr A* near
the event horizon.


title: On Supersymmetric D7-branes in the Warped Deformed Conifold

abstract:
  We study the supersymmetric properties of D7-branes in the warped deformed
conifold. We consider the $\kappa$-symmetry conditions on D7-branes in this
specific warped background, taking into account the background NS-NS 2-form
flux. While any holomorphic embedding defines a supersymmetric D7-brane in the
absence of background H-flux, most of the D7-brane embeddings considered in the
literature do not preserve supersymmetry for the warped deformed conifold
without also including brane worldvolume flux. For the simplest such embedding,
we construct numerically the worldvolume fluxnecessary to restore
supersymmetry. We also comment on the dual field theory descriptions in terms
of cascading N=1 supersymmetric gauge theories with flavors. Finally, we
discuss some possible applications of our results to moduli stabilization and
vacuum energy uplifting, gauge/gravity duality, and string inflationary model
building.


title: A gradient-directed Monte Carlo approach to molecular design

abstract:
  The recently developed linear combination of atomic potentials (LCAP)
approach [M.Wang et al., J. Am. Chem. Soc., 128, 3228 (2006)] allows continuous
optimization in discrete chemical space and thus is quite useful in the design
of molecules for targeted properties. To address further challenges arising
from the rugged, continuous property surfaces in the LCAP approach, we develop
a gradient-directed Monte Carlo (GDMC) strategy as an augmentation to the
original LCAP optimization method. The GDMC method retains the power of
exploring molecular space by utilizing local gradient information computed from
the LCAP approach to jump between discrete molecular structures. It also allows
random Monte Carlo moves to overcome barriers between local optima on property
surfaces. The combined GDMC and LCAP approach is demonstrated here for
optimizing nonlinear optical (NLO) properties in a class of donor-acceptor
substituted benzene and porphyrin frameworks. Specifically, one molecule with
four nitrogen atoms in the porphyrin ring was found to have a larger first
hyperpolarizability than structures with the conventional porphyrin motif. 1


title:
Next-to-Leading Order Hard Scattering Using Fully Unintegrated Parton
  Distribution Functions

abstract:
  We calculate the next-to-leading order fully unintegrated hard scattering
coefficient for unpolarized gluon-induced deep inelastic scattering using the
logical framework of parton correlation functions developed in previous work.
In our approach, exact four-momentum conservation is maintained throughout the
calculation. Hence, all non-perturbative functions, like parton distribution
functions, depend on all components of parton four-momentum. In contrast to the
usual collinear factorization approach where the hard scattering coefficient
involves generalized functions (such as Dirac $\delta$-functions), the fully
unintegrated hard scattering coefficient is an ordinary function. Gluon-induced
deep inelastic scattering provides a simple illustration of the application of
the fully unintegrated factorization formalism with a non-trivial hard
scattering coefficient, applied to a phenomenologically interesting case.
Furthermore, the gluon-induced process allows for a parameterization of the
fully unintegrated gluon distribution function.


title: Contact structures, sutured Floer homology and TQFT

abstract:
  We describe the natural gluing map on sutured Floer homology which is induced
by the inclusion of one sutured manifold (M',\Gamma') into a larger sutured
manifold (M,\Gamma), together with a contact structure on M-M'. As an
application of this gluing map, we produce a (1+1)-dimensional TQFT by
dimensional reduction and study its properties.


title: Positive mass theorem for the Paneitz-Branson operator

abstract:
  We prove that under suitable assumptions, the constant term in the Green
function of the Paneitz-Branson operator on a compact Riemannian manifold
$(M,g)$ is positive unless $(M,g)$ is conformally diffeomophic to the standard
sphere. The proof is inspired by the positive mass theorem on spin manifolds by
Ammann-Humbert.


title: Quasar Black Hole Masses from Velocity Dispersions

abstract:
  Much progress has been made in measuring black hole (BH) masses in
(non-active) galactic nuclei using the tight correlation between stellar
velocity dispersions (sigma) in galaxies and the mass of their central BH. The
use of this correlation in quasars, however, is hampered by the difficulty in
measuring sigma in host galaxies that tend to be overpowered by their bright
nuclei. We discuss results from a project that focuses on z~0.3 quasars
suffering from heavy extinction at shorter wavelengths. This makes it possible
to obtain clean spectra of the hosts in the spectral regions of interest, while
broad lines (like H-alpha) are still visible at longer wavelengths. We compare
BH masses obtained from velocity dispersions to those obtained from the broad
line region and thus probe the evolution of this relation and BH growth with
redshift and luminosity. Our preliminary results show an offset between the
position of our objects and the local relation, in the sense that red quasars
have, on average, lower velocity dispersions than local galaxies. We discuss
possible biases and systematic errors that may affect our results.


title: Transits and secondary eclipses of HD 189733 with Spitzer

abstract:
  We present limits on transit timing variations and secondary eclipse depth
variations at 8 microns with the Spitzer Space Telescope IRAC camera. Due to
the weak limb darkening in the infrared and uninterrupted observing, Spitzer
provides the highest accuracy transit times for this bright system, in
principle providing sensitivity to secondary planets of Mars mass in resonant
orbits. Finally, the transit data provides tighter constraints on the
wavelength- dependent atmospheric absorption by the planet.


title: Summary of hints for new physics from (quark) flavour physics

abstract:
  Recently two hints for new physics have emerged: The B_s mixing phase phi_s
and the rate of D_s -> (mu,tau) nu exposing a discrepancy of \sim 3 sigma and
3.8 sigma deviation from the Standard Model respectively. Moreover the
difference of the CP asymmetries in B -> K pi between the charged and neutral
modes is at the 5.3 sigma level which is somewhat larger than expected. New
physics in phi_s or A_CP(B -> K pi) would be in contradiction with the minimal
flavour violation hypothesis. The latter has recently attracted attention
because of the absence of deviation in CP and flavour violation in the quark
sector.