title:
Localization of an impurity particle on a boson Mott insulator
  background

abstract:
  We investigate the behavior of a single particle hopping on a three
dimensional cubic optical lattice in the presence of a Mott insulator of bosons
in the same lattice. We calculate the critical interaction strength between the
impurity and background bosons, beyond which there is bound state (polaron)
formation. We give exact results in the limit of a perfect Mott insulator,
where polaron formation is equivalent to impurity localization. We calculate
the effects of lattice anisotropy, higher impurity bands, and fluctuations of
the Mott insulator on the localization threshold. We argue that our results can
be checked experimentally by RF spectroscopy of impurity particles.


title:
Universal properties of the confining string in the random percolation
  model

abstract:
  Random percolation can be fully interpreted as a confining pure gauge theory.
With numerical high-precision measurements of Polyakov-Polyakov correlators at
finite temperature, we could well observe the presence of shape effects due to
rough fluctuations of the confining string, in complete agreement with the
universality predictions up to the next-to-leading order.


title: Gravitation, Cosmology and Space-Time Torsion

abstract:
  Poincar\'e gauge theory of gravity offers opportunities to solve some
principal problems of general relativity theory and modern cosmology. In the
frame of this theory the gravitational interaction can have the repulsion
character in the case of usual gravitating matter with positive values of
energy density and pressure satisfying energy dominance condition. Cosmological
consequences of gravitational repulsion are considered in the case of
homogeneous isotropic models in connection with the problem of cosmological
singularity and dark energy problem of general relativity theory. Regular Big
Bang inflationary scenario with accelerating stage of cosmological expansion at
asymptotics and the principal role of space-time torsion in this scenario are
discussed.


title: Decay of Scalar Condensation in Quantum Field Theory

abstract:
  We consider decay processes of scalar-field condensation in the framework of
well-established quantum field theory. We postulate that the quantum state
corresponding to the scalar-field condensation is so-called coherent state with
discussing the validity of such a treatment. We show that, by using the
unitarity relation of the scattering matrix, decay rate of the coherent state
is systematically calculated. We apply our procedure to derive explicit
formulae of decay rates for two cases: (i) we study the case where the scalar
condensation decays into a pair of scalar particles and show that our formalism
reproduces the results obtained from the parametric-resonance analysis, and
(ii) we also calculate the decay rate when the coherent state decays via
anomaly.


title: Transference of bilinear multiplier operators on Lorentz spaces

abstract:
  We prove a DeLeeuw type theorem of transference of boundedness for modulation
invariant multiplier operators between the groups defined by the real line and
the torus.


title: Pyrolysis of secondary raw material from used frying oils

abstract:
  A totally green chemistry alternative that would lead both to energy
production from renewable feedstocks and to solutions of parts of ecological
problems related to waste disposals would be very attractive. Pyrolysis of used
frying oils seems to be one option for this attractive alternative as we
propose to demonstrate in this study. Since 2002, the whole production of waste
edible oils (around 100 000 tons per year in France) must be collected and
transformed into secondary raw material by specific companies. The general aim
of the present work is to produce one of the following target sources of
energy: (i) H2 for fuel cells, (ii) H2/CO in satisfactory ratios to produce
biodiesel by Fischer-Tropsch (FT) reaction, or (iii) hydrocarbon mixtures with
high added value. Therefore, in this work, the conversion of a crude used
frying oil, named VEGETAMIXOIL^(r); from Ecogras Company (France), was
investigated (weight composition: C 73.6%; O 9.7%; H 12.2%). In support of our
knowledge related to fatty acids and methyl esters, a laboratory pilot plant
was built to study the pyrolysis of used frying oils. Effects of temperature
(700-800 degrees C), residence time, addition of reaction initiator (H2O2) or
inhibitor (thiophene), and diluent (water or nitrogen) were analysed with
regard to the nature and amounts of pyrolysis products. Results led to the
conclusion that the best operating conditions of pyrolysis are 800 degrees C
with water as diluent, leading to the production of dihydrogen (40%) and
hydrocarbons from methane to propylene, essentially. CO and CO2 are also
produced but with low molar fractions. Furthermore, a ratio H2/CO favourable
for low temperature FT is obtained.


title: On three approaches to conjugacy in semigroups

abstract:
  We compare three approaches to the notion of conjugacy for semigroups, the
first one via the transitive closure of the $uv\sim vu$ relation, the second
one via an action of inverse semigroups on themselves by partial
transformations, and the third one via characters of finite-dimensional
representations.


title: A search for various double beta decay modes of tin isotopes

abstract:
  For the first time an extensive search for various double beta decay modes of
124Sn and 112Sn has been performed. A total exposure of 43.29 kg.days has been
accumulated. New half-life limits of 124Sn into excited states of 124Te have
been obtained; the lower half-life limit for the first excited 2+ state at
602.7keV is T_1/2 > 3.1 *10^{18}yrs (90 % CL) and for the first excited 0+
state T_1/2 > 7.7 *10^{18}yrs (90 % CL). For the very first time, ground state
and excited state transitions of 112Sn have been experimentally explored. The
obtained half-life limits for ECEC and beta+/EC into the first excited 2+ state
of 112Cd are both T_1/2 >1.4 *10^{18}yrs (90 % CL). A resonance enhancement in
the decay rate for 0nuECEC might be expected for the 0+-state at 1870.9keV due
to degeneracy with the 112Sn ground state. No signal was found resulting in a
lower half-life limit of T_1/2 > 1.6 *10^{18} yrs (90 % CL) for this decay. As
all the excited state searches are based on gamma-lines, all half-life limits
apply for both neutrino and neutrino-less modes. Neutrinoless ground state
transitions were searched for in the ECEC and beta+/EC mode and a limit of
T_1/2 > 1.5 *10^{18} yrs (90 % CL) was obtained for ECEC decays of 112Sn,
whilst the beta+/EC mode results are inconclusive.


title: D0 - D0bar mixing: theory basics

abstract:
  I discuss how the novel experimental data on D0 - D0bar mixing can be
combined to provide information on the fundamental theoretical quantities
describing the mixing itself. I then discuss the theoretical impact of the new
data, focusing in particular on the MSSM.


title: Emergence of Scale-Free Syntax Networks

abstract:
  The evolution of human language allowed the efficient propagation of
nongenetic information, thus creating a new form of evolutionary change.
Language development in children offers the opportunity of exploring the
emergence of such complex communication system and provides a window to
understanding the transition from protolanguage to language. Here we present
the first analysis of the emergence of syntax in terms of complex networks. A
previously unreported, sharp transition is shown to occur around two years of
age from a (pre-syntactic) tree-like structure to a scale-free, small world
syntax network. The nature of such transition supports the presence of an
innate component pervading the emergence of full syntax. This observation is
difficult to interpret in terms of any simple model of network growth, thus
suggesting that some internal, perhaps innate component was at work. We explore
this problem by using a minimal model that is able to capture several
statistical traits. Our results provide evidence for adaptive traits, but it
also indicates that some key features of syntax might actually correspond to
non-adaptive phenomena.


title:
Three-frame Algorithm of Car Path Reconstruction from Airborne Traffic
  Data

abstract:
  The airborne traffic monitoring system forms a novel technology of detecting
vehicle motion. An optical digital camera located on an airborne platform
produces a series of images which then are processed to recognized the fixed
vehicles. In this way the video data are converted into the time sequence of
frames containing the vehicle coordinates. In the present work a three-frame
algorithm is developed to identify the succeeding vehicle positions. It is
based on finding the neighboring points in the frame sequence characterized by
minimal acceleration. To verify and optimize the developed algorithm a
``Virtual Road'' simulator was created. Finally available empirical data are
analyzed using the created algorithm.


title: Flux Distribution in Superconducting Films with Holes

abstract:
  Flux penetration into type-II superconducing films is simulated for
transverse applied magnetic field and flux creep dynamics. The films contain
macroscopic, non-conducting holes and we suggest a new method to introduce the
holes in the simulation formalism. The method implies reconstruction of the
magnetic field change inside the hole. We find that in the region between the
hole and the edge the current density is compressed so that the flux density is
slightly reduced, but the traffic of flux is significantly increased. The
results are in good agreement with magneto-optical studies of flux
distributions in YBCO films.


title:
Boundedness from H^1 to L^1 of Riesz transforms on a Lie group of
  exponential growth

abstract:
  Let $G$ be the Lie group given by the semidirect product of $R^2$ and $R^+$
endowed with the Riemannian symmetric space structure. Let $X_0, X_1, X_2$ be a
distinguished basis of left-invariant vector fields of the Lie algebra of $G$
and define the Laplacian $\Delta=-(X_0^2+X_1^2+X_2^2)$. In this paper we
consider the first order Riesz transforms $R_i=X_i\Delta^{-1/2}$ and
$S_i=\Delta^{-1/2}X_i$, for $i=0,1,2$. We prove that the operators $R_i$, but
not the $S_i$, are bounded from the Hardy space $H^1$ to $L^1$. We also show
that the second order Riesz transforms $T_{ij}=X_i\Delta^{-1}X_j$ are bounded
from $H^1$ to $L^1$, while the Riesz transforms $S_{ij}=\Delta^{-1}X_iX_j$ and
$R_{ij}=X_iX_j\Delta^{-1}$ are not.


title: The Hall algebra of a cyclic quiver at $q=0$

abstract:
  We show that the generic Hall algebra of nilpotent representations of an
oriented cycle specialised at $q=0$ is isomorphic to the generic extension
monoid in the sense of Reineke. This continues the work of Reineke.


title:
Bose-Einstein condensate in a harmonic trap with an eccentric dimple
  potential

abstract:
  We investigate Bose-Einstein condensation of noninteracting gases in a
harmonic trap with an off-center dimple potential. We specifically consider the
case of a tight and deep dimple potential which is modelled by a point
interaction. This point interaction is represented by a Dirac delta function.
The atomic density, chemical potential, critical temperature and condensate
fraction, the role of the relative depth and the position of the dimple
potential are analyzed by performing numerical calculations.


title: Which 3-manifold groups are K\"ahler groups?

abstract:
  The question in the title, first raised by Goldman and Donaldson, was
partially answered by Reznikov. We give a complete answer, as follows: if G can
be realized as both the fundamental group of a closed 3-manifold and of a
compact K\"ahler manifold, then G must be finite, and thus belongs to the
well-known list of finite subgroups of O(4).


title:
Dissociation energy of the water dimer from Quantum Monte Carlo
  calculations

abstract:
  We report a study of the electronic dissociation energy of the water dimer
using quantum Monte Carlo (QMC) techniques. We have performed variational
quantum Monte Carlo (VMC) and diffusion quantum Monte Carlo (DMC) calculations
of the electronic ground state of the water monomer and dimer using
all-electron and pseudopotential approaches. We have used Slater-Jastrow trial
wave functions with B3LYP-like single-particle orbitals, into which we have
incorporated backflow correlations. When backflow correlations are introduced,
the total energy of the water monomer decreases by about 4-5 mHa, yielding a
DMC energy of -76.42830(5) Ha, which is only 10 mHa above the experimental
value. In our pseudopotential DMC calculations, we have compared the total
energies of the water monomer and dimer obtained using the locality
approximation with those from the variational scheme recently proposed by
Casula [Phys. Rev. B 74, 161102(R) (2006)]. The time step errors in the Casula
scheme are larger and the extrapolation of the energy to zero time step always
lies above the result obtained with the locality approximation. However, the
errors cancel when energy differences are taken, yielding electronic
dissociation energies within error bars of each other. The dissociation
energies obtained in our various all-electron and pseudopotential calculations
range between 5.03(7) and 5.47(9) kcal/mol and are in good agreement with
experiment. Our calculations give monomer dipole moments which range between
1.897(2) and 1.909(4) Debye and dimer dipole moments which range between
2.628(6) and 2.672(5) Debye.


title:
Uniqueness of spacelike hypersurfaces with constant higher order mean
  curvature in generalized Robertson-Walker spacetimes

abstract:
  In this paper we study the problem of uniqueness for spacelike hypersurfaces
with constant higher order mean curvature in generalized Robertson-Walker (GRW)
spacetimes. In particular, we consider the following question: Under what
conditions must a compact spacelike hypersurface with constant higher order
mean curvature in a spatially closed GRW spacetime be a spacelike slice? We
prove that this happens, esentially, under the so called convergence condition.
Our approach is based on the use of the Newton transformations (and their
associated differential operators) and the Minkowski formulae for spacelike
hypersurfaces.


title: Bayesian Nash Equilibria and Bell Inequalities

abstract:
  Games with incomplete information are formulated in a multi-sector
probability matrix formalism that can cope with quantum as well as classical
strategies. An analysis of classical and quantum strategy in a multi-sector
extension of the game of Battle of Sexes clarifies the two distinct roles of
nonlocal strategies, and establish the direct link between the true quantum
gain of game's payoff and the breaking of Bell inequalities.


title: Two-proton correlation function: a gentle introduction

abstract:
  The recent COSY-11 collaboration measurement of the two-proton correlation
function in the pp -> ppeta reaction, reported at this meeting [1], arouse some
interest in a simple theoretical description of the correlation function. In
these notes we present a pedagogical introduction to the practical methods that
can be used for calculating the correlation function.


title: Agent Simulation of Chain Bankruptcy

abstract:
  We have conducted an agent-based simulation of chain bankruptcy. The
propagation of credit risk on a network, i.e., chain bankruptcy, is the key to
nderstanding largesized bankruptcies. In our model, decrease of revenue by the
loss of accounts payable is modeled by an interaction term, and bankruptcy is
defined as a capital deficit. Model parameters were estimated using financial
data for 1,077 listed Japanese firms. Simulations of chain bankruptcy on the
real transaction network consisting of those 1,077 firms were made with the
estimated model parameters. Given an initial bankrupt firm, a list of chain
bankrupt firms was obtained. This model can be used to detect high-risk links
in a transaction network, for the management of chain bankruptcy.


title: City Space Syntax as a Complex Network

abstract:
  The encoding of cities into non-planar dual graphs reveals their complex
structure. We investigate the statistics of the typical space syntax measures
for the five different compact urban patterns. Universal statistical behavior
of space syntax measures uncovers the universality of the city creation
mechanism.


title: Collective excitations of BEC under anharmonic trap position jittering

abstract:
  Collective excitations of a Bose-Einstein condensate under periodic
oscillations of a quadratic plus quartic trap position has been studied. A
coupled set of variational equations is derived for the width and the
condensate wave function center. Analytical expressions for the growth of
oscillation amplitudes in the resonance case are derived. It is shown that
jittering of an anharmonic trap position can cause double resonance of the BEC
width and the center of mass oscillation in the wide range of the BEC
parameters values. The predictions of variational approach are confirmed by
full numerical simulations of the 1D GP equation.


title: Projective Market Model Approach to AHP Decision-Making

abstract:
  In this paper we describe market in projective geometry language and give
definition of a matrix of market rate, which is related to the matrix rate of
return and the matrix of judgements in the Analytic Hierarchy Process (AHP). We
use these observations to extend the AHP model to projective geometry formalism
and generalise it to intransitive case. We give financial interpretations of
such generalised model and propose its simplification. The unification of the
AHP model and projective aspect of portfolio theory suggests a wide spectrum of
new applications such extended model.


title:
On the mechanical quality factors of cryogenic test masses from fused
  silica and crystalline quartz

abstract:
  Current interferometric gravitational wave detectors (IGWDs) are operated at
room temperature with test masses made from fused silica. Fused silica shows
very low absorption at the laser wavelength of 1064 nm. It is also well suited
to realize low thermal noise floors in the detector signal band since it offers
low mechanical loss, i. e. high quality factors (Q factors) at room
temperature. However, for a further reduction of thermal noise, cooling the
test masses to cryogenic temperatures may prove an interesting technique. Here
we compare the results of Q factor measurements at cryogenic temperatures of
acoustic eigenmodes of test masses from fused silica and its crystalline
counterpart. Our results show that the mechanical loss of fused silica
increases with lower temperature and reaches a maximum at 30 K for frequencies
of slightly above 10 kHz. The losses of crystalline quartz generally show lower
values and even fall below the room temperature values of fused silica below 10
K. Our results show that in comparison to fused silica, crystalline quartz has
a considerably narrower and lower dissipation peak on cooling and thus has more
promise as a test mass material for IGDWs operated at cryogenic temperatures.
The origin of the different Q factor versus temperature behavior of the two
materials is discussed.


title: Electrical networks on $n$-simplex fractals

abstract:
  The decimation map $\mathcal{D}$ for a network of admittances on an
$n$-simplex lattice fractal is studied. The asymptotic behaviour of
$\mathcal{D}$ for large-size fractals is examined. It is found that in the
vicinity of the isotropic point the eigenspaces of the linearized map are
always three for $n \geq 4$; they are given a characterization in terms of
graph theory. A new anisotropy exponent, related to the third eigenspace, is
found, with a value crossing over from $\ln[(n+2)/3]/\ln 2$ to
$\ln[(n+2)^3/n(n+1)^2]/\ln 2$.


title: Interest rates mapping

abstract:
  The present study deals with the analysis and mapping of Swiss franc interest
rates. Interest rates depend on time and maturity, defining term structure of
the interest rate curves (IRC). In the present study IRC are considered in a
two-dimensional feature space - time and maturity. Geostatistical models and
machine learning algorithms (multilayer perceptron and Support Vector Machines)
were applied to produce interest rate maps. IR maps can be used for the
visualisation and patterns perception purposes, to develop and to explore
economical hypotheses, to produce dynamic asses-liability simulations and for
the financial risk assessments. The feasibility of an application of interest
rates mapping approach for the IRC forecasting is considered as well.


title: Functional treatment of quantum scattering via the dynamical principle

abstract:
  A careful functional treatment of quantum scattering is given using
Schwinger's dynamical principle which involves a functional differentiation
operation applied to a generating functional written in closed form. For long
range interactions, such as for the Coulomb one, it is shown that this
expression may be used to obtain explicitly the asymptotic "free" modified
Green function near the energy shell.


title:
Calabi-Bernstein results for maximal surfaces in Lorentzian product
  spaces

abstract:
  In this paper we establish new Calabi-Bernstein results for maximal surfaces
immersed into a Lorentzian product space of the form $M^2\times\mathbb{R}_1$,
where $M^2$ is a connected Riemannian surface and $M^2\times\mathbb{R}_1$ is
endowed with the Lorentzian metric $<,>=<,>_{M}-dt^2$. In particular, when $M$
is a Riemannian surface with non-negative Gaussian curvature $K_M$, we prove
that any complete maximal surface in $M^2\times\mathbb{R}_1$ must be totally
geodesic. Besides, if $M$ is non-flat we conclude that it must be a slice
$M\times\{t_0\}$, $t_0\in\mathbb{R}$ (here by "complete" it is meant, as usual,
that the induced Riemannian metric on the maximal surface from the ambient
Lorentzian metric is complete). We prove that the same happens if the maximal
surface is complete with respect to the metric induced from the Riemannian
product $M^2\times\mathbb{R}$. This allows us to give also a non-parametric
version of the Calabi-Bernstein theorem for entire maximal graphs in
$M^2\times\mathbb{R}_1$, under the same assumptions on $K_M$. Moreover, we also
construct counterexamples which show that our Calabi-Bernstein results are no
longer true without the hypothesis $K_M\geq 0$. These examples are constructed
via a duality result between minimal and maximal graphs.


title: A topos for algebraic quantum theory

abstract:
  The aim of this paper is to relate algebraic quantum mechanics to topos
theory, so as to construct new foundations for quantum logic and quantum
spaces. Motivated by Bohr's idea that the empirical content of quantum physics
is accessible only through classical physics, we show how a C*-algebra of
observables A induces a topos T(A) in which the amalgamation of all of its
commutative subalgebras comprises a single commutative C*-algebra. According to
the constructive Gelfand duality theorem of Banaschewski and Mulvey, the latter
has an internal spectrum S(A) in T(A), which in our approach plays the role of
a quantum phase space of the system. Thus we associate a locale (which is the
topos-theoretical notion of a space and which intrinsically carries the
intuitionistic logical structure of a Heyting algebra) to a C*-algebra (which
is the noncommutative notion of a space). In this setting, states on A become
probability measures (more precisely, valuations) on S(A), and self-adjoint
elements of A define continuous functions (more precisely, locale maps) from
S(A) to Scott's interval domain. Noting that open subsets of S(A) correspond to
propositions about the system, the pairing map that assigns a (generalized)
truth value to a state and a proposition assumes an extremely simple
categorical form. Formulated in this way, the quantum theory defined by A is
essentially turned into a classical theory, internal to the topos T(A).


title:
Interplay between Bonding and Magnetism in the Adsorption of NO on Rh
  Clusters

abstract:
  We have studied the adsorption of NO on small Rh clusters, containing one to
five atoms, using density functional theory in both spin-polarized and
non-spin-polarized forms. We find that NO bonds more strongly to Rh clusters
than it does to Rh(100) or Rh(111); however, it also quenches the magnetism of
the clusters. This (local) effect results in reducing the magnitude of the
adsorption energy, and also washes out the clear size-dependent trend observed
in the non-magnetic case. Our results illustrate the competition present
between the tendencies to bond and to magnetize, in small clusters.


title: X-Ray Eclipse Time Delays in 4U2129+47

abstract:
  4U 2129+47 was discovered in the early 80's and classified as an accretion
disk corona source due to its broad and partial X-ray eclipses. The 5.24 hr
binary orbital period was inferred from the X-ray and optical light curve
modulation, implying a late K or M spectral type companion star.
  The source entered a low state in 1983, during which the optical modulation
disappeared and an F8 IV star was revealed, suggesting that 4U 2129+47 might be
part of a triple system. The nature of 4U 2129+47 has since been investigated,
but no definitive conclusion has been reached.
  Here, we present timing and spectral analyses of two XMM-Newton observations
of this source, carried out in May and June, 2005. We find evidence for a delay
between two mid-eclipse epochs measured ~22 days apart, and we show that this
delay can be naturally explained as being due to the orbital motion of the
binary 4U 2129+47 around the center of mass of a triple system. This result
thus provides further support in favor of the triple nature of 4U 2129+47.


title: Are biological neurons that vicious ? Or only their models ?

abstract:
  This paper has been withdrawn. Its main conclusions have been published in
"On dynamics of integrate-and-fi re neural networks with conductance based
synapses", arXiv:0709.4370 and
http://www.frontiersin.org/computational_neuroscience/10.3389/neuro.10/002.2008/abstract

categories: physics.bio-ph nlin.AO physics.comp-ph q-bio.NC


title: QCD with overlap fermions: Running coupling and the 3-loop beta-function

abstract:
  We calculate the relation between the bare coupling constant g_0 and the
MSbar-renormalized coupling g_MS: g_0 = Z_g(g_0,a \mu) g_MS, to 2 loops in
perturbation theory. We employ the standard Wilson action for gluons and the
overlap action for fermions. For convenience, we have worked with the
background field technique, which only requires evaluation of 2-point Green's
function for the problem at hand. Our results depend explicitly on the number
of fermion flavors (N_f) and colors (N). Since the dependence of Z_g on the
overlap parameter rho cannot be extracted analytically, we tabulate our results
for different values in the allowed range of rho (0 < rho < 2), focusing on
values which are being used most frequently in simulations. Knowledge of Z_g
allows us to derive the 3-loop coefficient of the bare beta-function
(beta_L(g_0)) which, unlike the 1- and 2-loop coefficients, is
regularization-dependent. The nontrivial dependence of Z_g and of beta_L(g_0)
on rho is plotted for various choices of N, N_f.


title: Fermionic Zero Modes in Gauge and Gravity Backgrounds on a Sphere

abstract:
  In this letter we study fermionic zero modes in gauge and gravity backgrounds
taking a two dimensional compact manifold $S^2$ as extra dimensions. The result
is that there exist massless Dirac fermions which have normalizable zero modes
under quite general assumptions about these backgrounds on the bulk. Several
special cases of gauge background on the sphere are discussed and some simple
fermionic zero modes are obtained.


title:
On Dynamics of Integrate-and-Fire Neural Networks with Conductance Based
  Synapses

abstract:
  We present a mathematical analysis of a networks with Integrate-and-Fire
neurons and adaptive conductances. Taking into account the realistic fact that
the spike time is only known within some \textit{finite} precision, we propose
a model where spikes are effective at times multiple of a characteristic time
scale $\delta$, where $\delta$ can be \textit{arbitrary} small (in particular,
well beyond the numerical precision). We make a complete mathematical
characterization of the model-dynamics and obtain the following results. The
asymptotic dynamics is composed by finitely many stable periodic orbits, whose
number and period can be arbitrary large and can diverge in a region of the
synaptic weights space, traditionally called the "edge of chaos", a notion
mathematically well defined in the present paper. Furthermore, except at the
edge of chaos, there is a one-to-one correspondence between the membrane
potential trajectories and the raster plot. This shows that the neural code is
entirely "in the spikes" in this case. As a key tool, we introduce an order
parameter, easy to compute numerically, and closely related to a natural notion
of entropy, providing a relevant characterization of the computational
capabilities of the network. This allows us to compare the computational
capabilities of leaky and Integrate-and-Fire models and conductance based
models. The present study considers networks with constant input, and without
time-dependent plasticity, but the framework has been designed for both
extensions.


title: The Gradient Mechanism in a Communication Network

abstract:
  We study the efficiency of the gradient mechanism of message transfer in a
$2-d$ communication network of regular nodes and randomly distributed hubs.
Each hub on the network is assigned some randomly chosen capacity and hubs with
lower capacities are connected to the hubs with maximum capacity. The average
travel time of single messages traveling on this lattice, plotted as a function
of hub density, shows q-exponential behavior. At high hub densities, this
distribution can be fitted well by a power law. We also study the relaxation
behavior of the network when a large number of messages are created
simultaneously at random locations, and travel on the network towards their
designated destinations. For this situation, in the absence of the gradient
mechanism, the network can show congestion effects due to the formation of
transport traps. We show that if hubs of high betweenness centrality are
connected by the gradient mechanism, efficient decongestion can be achieved.
The gradient mechanism is less prone to the formation of traps than other
decongestion schemes. We also study the spatial configurations of transport
traps, and propose minimal strategies for their elimination.


title:
Photon lasing in a GaAs microcavity: similarities with a polariton
  condensate

abstract:
  We study experimentally the lasing regime of a GaAs based microcavity sample
under strong optical pumping. The very same sample exhibits the strong coupling
regime at low excitation power with a Rabi splitting as large as 15 meV. We
show that some features which may be considered as experimental evidence of
polariton Bose Einstein condensation are also observed in the weak coupling
regime when the cavity is behaving as a regular photon laser. In particular,
the emission pattern in the lasing regime displays a sharp peak near the energy
minimum followed by a Boltzmann distribution at higher energies.


title: The pre-cataclysmic variable, LTT560

abstract:
  System parameters of the object LTT560 are determined in order to clarify its
nature and evolutionary status. We apply time-series photometry to reveal
orbital modulations of the light curve, time-series spectroscopy to measure
radial velocities of features from both the primary and the secondary star, and
flux-calibrated spectroscopy to derive temperatures of both components. We find
that LTT560 is composed of a low temperature T~7500K DA white dwarf as the
primary and an M5.5+-1 main-sequence star as the secondary component. The
current orbital period is Porb=3.54(07)h. We derive a mass ratio Msec/Mwd =
0.36(03) and estimate the distance to d=25-40pc. Long-term variation of the
orbital light curve and an additional H-alpha emission component on the white
dwarf indicate activity in the system, probably in the form of flaring and/or
accretion events.


title: Lubricated friction between incommensurate substrates

abstract:
  This paper is part of a study of the frictional dynamics of a confined solid
lubricant film - modelled as a one-dimensional chain of interacting particles
confined between two ideally incommensurate substrates, one of which is driven
relative to the other through an attached spring moving at constant velocity.
This model system is characterized by three inherent length scales; depending
on the precise choice of incommensurability among them it displays a strikingly
different tribological behavior. Contrary to two length-scale systems such as
the standard Frenkel-Kontorova (FK) model, for large chain stiffness one finds
that here the most favorable (lowest friction) sliding regime is achieved by
chain-substrate incommensurabilities belonging to the class of non-quadratic
irrational numbers (e.g., the spiral mean). The well-known golden mean
(quadratic) incommensurability which slides best in the standard FK model shows
instead higher kinetic-friction values. The underlying reason lies in the
pinning properties of the lattice of solitons formed by the chain with the
substrate having the closest periodicity, with the other slider.


title: Scaling and Universality in City Space Syntax: between Zipf and Matthew

abstract:
  We report about universality of rank-integration distributions of open spaces
in city space syntax similar to the famous rank-size distributions of cities
(Zipf's law). We also demonstrate that the degree of choice an open space
represents for other spaces directly linked to it in a city follows a power law
statistic. Universal statistical behavior of space syntax measures uncovers the
universality of the city creation mechanism. We suggest that the observed
universality may help to establish the international definition of a city as a
specific land use pattern.


title: On Gauss-Bonnet Curvatures

abstract:
  The $(2k)$-th Gauss-Bonnet curvature is a generalization to higher dimensions
of the $(2k)$-dimensional Gauss-Bonnet integrand, it coincides with the usual
scalar curvature for $k=1$. The Gauss-Bonnet curvatures are used in theoretical
physics to describe gravity in higher dimensional space times where they are
known as the Lagrangian of Lovelock gravity, Gauss-Bonnet Gravity and Lanczos
gravity. In this paper we present various aspects of these curvature invariants
and review their variational properties. In particular, we discuss natural
generalizations of the Yamabe problem, Einstein metrics and minimal
submanifolds.


title:
Importance of hydrodynamic shielding for the dynamic behavior of short
  polyelectrolyte chains

abstract:
  The dynamic behavior of polyelectrolyte chains in the oligomer range is
investigated with coarse-grained molecular dynamics simulation and compared to
data obtained by two different experimental methods, namely capillary
electrophoresis and electrophoresis NMR. We find excellent agreement of
experiments and simulations when hydrodynamic interactions are accounted for in
the simulations. We show that the electrophoretic mobility exhibits a maximum
in the oligomer range and for the first time illustrate that this maximum is
due to the hydrodynamical shielding between the chain monomers. Our findings
demonstrate convincingly that it is possible to model dynamic behavior of
polyelectrolytes using coarse grained models for both, the polyelectrolyte
chains and the solvent induced hydrodynamic interactions.


title: Lepton Mass Effects in Single Pion Production by Neutrinos

abstract:
  We reconsider the Feynman-Kislinger-Ravndal model applied to
neutrino-excitation of baryon resonances. The effects of lepton mass are
included, using the formalism of Kuzmin, Lyubushkin and Naumov. In addition we
take account of the pion-pole contribution to the hadronic axial vector
current. Application of this new formalism to the reaction nu(mu) + p --> mu +
Delta at E(nu) approx 1 GeV gives a suppressed cross section at small angles,
in agreement with the screening correction in Adler's forward scattering
theorem. Application to the process nu(tau) + p --> tau + Delta at E(nu) approx
7 GeV leads to the prediction of right-handed tau polarization for
forward-going leptons, in line with a calculation based on an isobar model. Our
formalism represents an improved version of the Rein-Sehgal model,
incorporating lepton mass effects in a manner consistent with PCAC.


title: Spin-liquid dynamics of pyrochlore magnets Gd2Ti2O7 and Gd2Sn2O7

abstract:
  The spin-liquid phase of two highly frustrated pyrochlore magnets Gd2Ti2O7
and Gd2Sn2O7 is probed using electron spin resonance in the temperature range
1.3 - 30 K. The deviation of the absorption line from the paramagnetic position
\nu =\gamma H observed in both compounds below the Curie-Weiss temperature
\Theta_CW ~ 10 K, suggests an opening up of a gap in the excitation spectra. On
cooling to 1.3 K (which is above the ordering transition T_N ~ 1.0 K) the
resonance spectrum is transformed into a wide band of excitations with the gap
amounting to \Delta ~ 26 GHz (1.2 K) in Gd2Ti2O7 and 18 GHz (0.8 K) in
Gd2Sn2O7. The gaps increase linearly with the external magnetic field. For
Gd2Ti2O7 this branch co-exists with an additional nearly paramagnetic line
absent in Gd2Sn2O7. These low lying excitations with gaps, which are preformed
in the spin-liquid state, may be interpreted as collective spin modes split by
the single-ion anisotropy.


title:
Discovery of the candidate pulsar wind nebula HESS J1718-385 in
  very-high-energy gamma-rays

abstract:
  Motivated by recent detections of pulsar wind nebulae in very-high-energy
(VHE) gamma rays, a systematic search for VHE gamma-ray sources associated with
energetic pulsars was performed, using data obtained with the H.E.S.S. (High
Energy Stereoscopic System) instrument. The search for VHE gamma-ray sources
near the pulsar PSR J1718-3825 revealed the new VHE gamma-ray source HESS
J1718-385. We report on the results from the HESS data analysis of this source
and on possible associations with the pulsar and at other wavelengths. We
investigate the energy spectrum of HESS J1718-385 that shows a clear peak. This
is only the second time a VHE gamma-ray spectral maximum from a cosmic source
was observed, the first being the Vela X pulsar wind nebula.


title: Un th\'eor\`eme de Helson pour des s\'eries de Walsh

abstract:
  Extension to Walsh series of theorems of Helson and Katznelson on
trigonometric series, saying that a trigonometric series whose partial sums are
positive has its coefficients tend to zero but is not necessarily a
Fourier-Lebesgue series


title: Hasard et d\'eterminisme chez Laplace

abstract:
  Laplace's views on randomness and determinism. The paper was written for
"Cahiers rationalistes" and addresses a rather wide audience. It contains large
quotations of Laplace, most of them coming from his introduction to the book
"Analytical theory of probabilities".


title: Mailles et ensembles de Sidon

abstract:
  Grid condition and Sidon sets. The grid condition stated by the author in
1957 as a necessary condition for a set of integers to be a Sidon set is
neither improvable nor sufficient ; explanations and stronger statements are
provided.


title: Correspondance de Howe: paires duales de type II

abstract:
  In this article, we give a new method for proving Howe correspondence in the
case of dual pairs of type $({\rm GL}_n, {\rm GL}_m)$ over a non-Archimedean
locally compact field $F$. The proof consists in combining a study on Kudla's
filtration with the results of a previous article of the autor about the
irreducibility of a parabolically induced representation. The proof is valid
for $F$ of any characteristic and allows us to make the correspondence explicit
in terms of Langlands parameters.


title: Exotic Non-relativistic String

abstract:
  We construct a classical non-relativistic string model in 3+1 dimensions. The
model contains a spurion tensor field that is responsible for the
non-commutative structure of the model. Under double dimensional reduction the
model reduces to the exotic non-relativistic particle in 2+1 dimensions.


title:
Ensembles quasi-ind\'ependants et ensembles de Sidon, th\'eorie de
  Bourgain (d'apr\`es Myriam D\'echamps, Li et Queffelec)

abstract:
  Exposition of the relation between quasi-independent and Sidon sets, theorems
of Pisier according to the method of Bourgain


title: Graph-different permutations

abstract:
  We strengthen and put in a broader perspective previous results of the first
two authors on colliding permutations. The key to the present approach is a new
non-asymptotic invariant for graphs.


title:
One-loop Electroweak and QCD corrections to vector boson scattering into
  top pairs and application to ILC

abstract:
  We calculate the electroweak and QCD corrections to W-W+ -> tt and ZZ -> tt.
We also consider the interplay of these corrections with the effect of
anomalous interactions that affect the massive weak bosons and the top. The
results at the VV level fusion are convoluted with the help of the effective
vector boson approximation to give predictions for a high energy e+e- collider.


title: Simulation of ratio of old to young people in countries like Poland

abstract:
  Countries like Poland with a recent sharp drop in birth rates still have some
time to prepare for the problems of an ageing society. Ater the year 2030 they
can become increasingly serious.


title:
A Detailed Analysis of the Dust Formation Zone of IRC+10216 Derived from
  Mid-IR Bands of C2H2 and HCN

abstract:
  A spectral survey of IRC+10216 has been carried out in the range 11 to 14 um
with a spectral resolution of about 4 km s^-1. We have identified a forest of
lines in six bands of C2H2 involving the vibrational states from the ground to
3nu5 and in two bands of HCN, involving the vibrational states from the ground
up to 2nu2. Some of these transitions are observed also in H13CCH and H13CN. We
have estimated the kinetic, vibrational, and rotational temperatures, and the
abundances and column densities of C2H2 and HCN between 1 and 300 R* (1.5E16
cm) by fitting about 300 of these ro-vibrational lines. The envelope can be
divided into three regions with approximate boundaries at 0.019 arcsec (the
stellar photosphere), 0.1 arcsec (the inner dust formation zone), and 0.4
arcsec (outer dust formation zone). Most of the lines might require a large
microturbulence broadening. The derived abundances of C2H2 and HCN increase by
factors of 10 and 4, respectively, from the innermost envelope outwards. The
derived column densities for both C2H2 and HCN are 1.6E19 cm^-2. Vibrational
states up to 3000 K above ground are populated, suggesting pumping by
near-infrared radiation from the star and innermost envelope. Low rotational
levels can be considered under LTE while those with J>20-30 are not
thermalized. A few lines require special analysis to deal with effects like
overlap with lines of other molecules.


title: Modified Gravity: living without Birkhoff I. DGP

abstract:
  We consider the consequences of the absence of Birkhoff's theorem in theories
of modified gravity. As an example, we calculate the gravitational force on a
test particle due to a spherical mass shell in the Dvali-Gabadaze-Porrati model
(DGP). We show that unlike in General Relativity, the force depends on the mass
distribution. In particular, the gravitational force within a spherical mass
shell depends on the geometric structure of the bulk, and is likely non-zero.


title:
Ordinary-derivative formulation of conformal totally symmetric arbitrary
  spin bosonic fields

abstract:
  Conformal totally symmetric arbitrary spin bosonic fields in flat space-time
of even dimension greater than or equal to four are studied. Second-derivative
(ordinary-derivative) formulation for such fields is developed. We obtain gauge
invariant Lagrangian and the corresponding gauge transformations. Gauge
symmetries are realized by involving the Stueckelberg and auxiliary fields.
Realization of global conformal boost symmetries on conformal gauge fields is
obtained. Modified de Donder gauge condition and de Donder-Stueckelberg gauge
condition are introduced. Using the de Donder-Stueckelberg gauge frame,
equivalence of the ordinary-derivative and higher-derivative approaches is
demonstrated. On-shell degrees of freedom of the arbitrary spin conformal field
are analyzed. Ordinary-derivative light-cone gauge Lagrangian of conformal
fields is also presented. Interrelations between the ordinary-derivative gauge
invariant formulation of conformal fields and the gauge invariant formulation
of massive fields are discussed.


title: Magnus subgroups of one-relator surface groups

abstract:
  A one-relator surface group is the quotient of an orientable surface group by
the normal closure of a single relator. A Magnus subgroup is the fundamental
group of a suitable incompressible sub-surface. A number of results are proved
about the intersections of such subgroups and their conjugates, analogous to
results of Bagherzadeh, Brodskii, and Collins in classical one-relator group
theory.


title:
Effect of internal friction on transformation twin dynamics in
  SrxBa1-xSnO3 perovskite

abstract:
  The dynamics of transformation twins in SrxBa1-xSnO3 (x=0.6,0.8) perovskite
has been studied by dynamical mechanical analysis in three-point bend geometry.
This material undergoes phase transitions from orthorhombic to tetragonal and
cubic structures on heating. The mechanical loss signatures of the
transformation twins include relaxation and frequency-independent peaks in the
orthorhombic and tetragonal phases, with no observed energy dissipation in the
cubic phase. The macroscopic shape, orientation and relative displacements of
twin walls have been calculated from bending and anisotropy energies. The
mechanical loss angle and distribution of relaxation time are discussed in term
of bending modes of domain walls.


title:
The Spatial String Tension in the Deconfined Phase of SU(N) Gauge Theory
  and Gauge/String Duality

abstract:
  The spatial string tension of a SU(N) gauge theory without quarks is
calculated using gauge/string duality for 1.2T_c<T<3T_c. The result is
remarkably consistent with the available lattice data for N=2,3. Some evidence
is found that to leading order the large distance physics of a string can be
described by a five-dimensional geometry without a need for an internal space.


title: Dressing the inflaton with the Standard Model gauge group

abstract:
  In this talk we will discuss how inflation can be embedded within a minimal
extension of the Standard Model where the inflaton carries the Standard Model
charges. There is no need of an ad-hoc scalar field to be introduced in order
to explain the temperature anisotropy of the cosmic microwave background
radiation, all the ingredients are present within a minimal supersymmetric
Standard Model. The model is robust enough to provide a successful exit from
inflation with all observed matter in the universe. This is a triumph for an
inflationary paradigm which has always begged a simple question: can we
identify the inflaton in a laboratory. We will briefly discuss how LHC can shed
some insight into the inflaton.


title: The Parallel-Sequential Duality : Matrices and Graphs

abstract:
  Usually, mathematical objects have highly parallel interpretations. In this
paper, we consider them as sequential constructors of other objects. In
particular, we prove that every reflexive directed graph can be interpreted as
a program that builds another and is itself builded by another. That leads to
some optimal memory computations, codings similar to modular decompositions and
other strange dynamical phenomenons.


title:
Spacelike hypersurfaces with constant mean curvature in the steady state
  space

abstract:
  We consider complete spacelike hypersurfaces with constant mean curvature in
the open region of de Sitter space known as the steady state space. We prove
that if the hypersurface is bounded away from the infinity of the ambient
space, then the mean curvature must be H=1. Moreover, in the 2-dimensional case
we obtain that the only complete spacelike surfaces with constant mean
curvature which are bounded away from the infinity are the totally umbilical
flat surfaces. We also derive some other consequences for hypersurfaces which
are bounded away from the future infinity. Finally, using an isometrically
equivalent model for the steady state space, we extend our results to a wider
family of spacetimes.


title:
Stability of the decagonal quasicrystal in the Lennard-Jones-Gauss
  system

abstract:
  Although quasicrystals have been studied for 25 years, there are many open
questions concerning their stability: What is the role of phason fluctuations?
Do quasicrystals transform into periodic crystals at low temperature? If yes,
by what mechanisms? We address these questions here for a simple
two-dimensional model system, a monatomic decagonal quasicrystal, which is
stabilized by the Lennard-Jones-Gauss potential in thermodynamic equilibrium.
It is known to transform to the approximant Xi, when cooled below a critical
temperature. We show that the decagonal phase is an entropically stabilized
random tiling. By determining the average particle energy for a series of
approximants, it is found that the approximant Xi is the one with lowest
potential energy.


title:
MMT Extremely Metal Poor Galaxy Survey I. An Efficient Technique to
  Identify Metal Poor Galaxies

abstract:
  We demonstrate a successful strategy for identifying extremely metal poor
galaxies. Our preliminary survey of 24 candidates contains 10 metal poor
galaxies of which 4 have 12+log(O/H)<7.65, some of the lowest metallicity blue
compact galaxies known to date. Interestingly, our sample of metal poor
galaxies have systematically lower metallicity for their luminosity than
comparable samples of blue compact galaxies, dIrrs, and normal star-forming
galaxies. Our metal poor galaxies share very similar properties, however, with
the host galaxies of nearby long-duration gamma-ray bursts (GRBs), including
similar metallicity, stellar ages, and star formation rates. We use H\beta to
measure the number of OB stars present in our galaxies and estimate a
core-collapse supernova rate of ~10^-3 yr^-1. A larger sample of metal poor
galaxies may provide new clues into the environment where GRBs form and may
provide a list of potential GRB hosts.


title: Classification of interest rate curves using Self-Organising Maps

abstract:
  The present study deals with the analysis and classification of interest rate
curves. Interest rate curves (IRC) are the basic financial curves in many
different fields of economics and finance. They are extremely important tools
in banking and financial risk management problems. Interest rates depend on
time and maturity which defines term structure of the interest rate curves. IRC
are composed of interest rates at different maturities (usually fixed number)
which move coherently in time. In the present study machine learning
algorithms, namely Self-Organising maps - SOM (Kohonen maps), are used to find
clusters and to classify Swiss franc (CHF) interest rate curves.


title:
Operators on superspaces and generalizations of the Gelfand-Kolmogorov
  theorem

abstract:
  (Write-up of a talk at the Bialowieza meeting, July 2007.)
  Gelfand and Kolmogorov in 1939 proved that a compact Hausdorff topological
space $X$ can be canonically embedded into the infinite-dimensional vector
space $C(X)^* $, the dual space of the algebra of continuous functions $C(X)$
as an "algebraic variety" specified by an infinite system of quadratic
equations.
  Buchstaber and Rees have recently extended this to all symmetric powers
$\Sym^n(X)$ using their notion of the Frobenius $n$-homomorphisms.
  We give a simplification and a further extension of this theory, which is
based, rather unexpectedly, on results from super linear lgebra.


title:
Minimal Affine Coordinates for SL(3,C) Character Varieties of Free
  Groups

abstract:
  Let X be the moduli of SL(3,C) representations of a rank r free group. In
this paper we determine minimal generators of the coordinate ring of X. This at
once gives explicit global coordinates for the moduli and determines the
dimension of the moduli's minimal affine embedding. Along the way, we utilize
results concerning the moduli of r-tuples of matrices in gl(3,C). Consequently,
we also state general invariant theoretic correspondences between the
coordinate rings of the moduli of r-tuples of elements in gl(n,C), sl(n,C), and
SL(n,C).


title: Theory of Relaxation Dynamics in Glass-Forming Hydrogen-Bonded Liquids

abstract:
  We address the relaxation dynamics in hydrogen-bonded super-cooled liquids
near the glass transition, measured via Broad-Band Dielectric Spectroscopy
(BDS). We propose a theory based on decomposing the relaxation of the
macroscopic dipole moment into contributions from hydrogen bonded clusters of
$s$ molecules, with $s_{min}\le s \le s_{max}$. The existence of $s_{max}$ is
due to dynamical arrest and its value may depend on the cooling protocol and on
the aging time. The existence of $s_{max}$ is translated into a sum-rule on the
concentrations of clusters of size $s$. We construct the statistical mechanics
of the super-cooled liquid subject to this sum-rule as a constraint, to
estimate the temperature-dependent density of clusters of size $s$. With a
theoretical estimate of the relaxation time of each cluster we provide
predictions for the real and imaginary part of the frequency dependent
dielectric response. The predicted spectra and their temperature dependence are
in accord with measurements, explaining a host of phenomenological fits like
the Vogel-Fulcher fit and the stretched exponential fit. Using glycerol as a
particular example we demonstrate quantitative correspondence between theory
and experiments. The theory also demonstrates that the $\alpha$ peak and the
"excess wing" stem from the same physics in this material. The theory also
shows that in other hydrogen -bonded glass formers the "excess wing" can
develop into a $\beta$ peak, depending on the molecular material parameters
(predominantly the surface energy of the clusters). We thus argue that $\alpha$
and $\beta$ peaks can stem from the same physics. Finally we address the BDS in
constrained geometries (pores) and explain why recent experiments on glycerol
did not show a deviation from bul k spectra.


title:
Exciting gauge unstable modes of the quark-gluon plasma by relativistic
  jets

abstract:
  We present a study of the properties of the collective modes of a system
composed by a thermalized quark-gluon plasma traversed by a relativistic jet of
partons. We find that when the jet traverses the system unstable gauge field
modes are excited and grow on very short time scales. The aim is to provide a
novel mechanism for the description of the jet quenching phenomenon, where the
jet crossing the plasma loses energy exciting colored unstable modes. In order
to simplify the analysis we employ a linear response approximation, valid for
short time scales. We assume that the partons in the jet can be described with
a tsunami-like distribution function, whereas we treat the quark-gluon plasma
employing two different approaches. In the first approach we adopt a Vlasov
approximation for the kinetic equations, in the second approach we solve a set
of fluid equations. In both cases we derive the expressions of the dispersion
law of the collective unstable modes and compare the results obtained.


title: Small x gluon from exclusive J/psi production

abstract:
  Exclusive J/psi production, gamma* p -> J/psi p, offers a unique opportunity
to determine the gluon density of the proton in the small x domain. We use the
available HERA data to determine the gluon distribution in the region 10^{-4}
<~ x <~ 10^{-2} and 2 <~ Q^2 <~ 10 GeV^2, where the uncertainty on the gluon
extracted from the global parton analyses is large. The gluon density is found
to be approximately flat at the lower scale; it is compared with those of
recent global analyses.


title:
Computing twisted conjugacy classes in free groups using nilpotent
  quotients

abstract:
  There currently exists no algebraic algorithm for computing twisted conjugacy
classes in free groups. We propose a new technique for deciding twisted
conjugacy relations using nilpotent quotients. Our technique is generalization
of the common abelianization method, but admits significantly greater rates of
success. We present experimental results demonstrating the efficacy of the
technique, and detail how it can be applied the related settings of surface
groups and doubly twisted conjugacy.


title: SUSY Higgs bosons at the LHC

abstract:
  Recent results on MSSM Higgs physics at the LHC are reviewed. The dependence
of the LHC discovery reach in the b\bar b H/A, H/A \to \tau^+\tau^- channel on
the underlying SUSY scenario is analysed. This is done by combining the latest
results for the prospective CMS experimental sensitivities for an integrated
luminosity of 30 or 60 fb^-1 with state-of-the-art theoretical predictions of
MSSM Higgs-boson properties. The results are interpreted in terms of the
parameters governing the MSSM Higgs sector at lowest order, M_A and tan_beta.
While the higgsino mass parameter \mu has a significant impact on the
prospective discovery reach (and correspondingly the ``LHC wedge'' region), it
is found that the discovery reach is rather stable with respect to variations
of other supersymmetric parameters. Within the discovery region a determination
of the masses of the heavy neutral Higgs bosons with an accuracy of 1-4% seems
feasible. It is furthermore shown that Higgs-boson production in central
exclusive diffractive channels can provide important information on the
properties of the neutral MSSM Higgs bosons.


title:
Comparison between high-energy proton and charged pion induced damage in
  Lead Tungstate calorimeter crystals

abstract:
  A Lead Tungstate crystal produced for the electromagnetic calorimeter of the
CMS experiment at the LHC was cut into three equal-length sections. The central
one was irradiated with 290 MeV/c positive pions up to a fluence of (5.67 +-
0.46)x10^13 /cm^2, while the other two were exposed to a 24 GeV/c proton
fluence of (1.17 +- 0.11) x 10^13/ cm^2. The damage recovery in these crystals,
stored in the dark at room temperature, has been followed over two years. The
comparison of the radiation-induced changes in light transmission for these
crystals shows that damage is proportional to the star densities produced by
the irradiation.


title: On the formalism of dark energy accretion onto black- and worm-holes

abstract:
  In this work a general formalism for the accretion of dark energy onto
astronomical objects, black holes and wormholes, is considered. It is shown
that in models with four dimensions or more, any singularity with a divergence
in the Hubble parameter may be avoided by a big trip, if it is assumed that
there is no coupling between the bulk and this accreting object. If this is not
the case in more than four dimensions, the evolution of the cosmological object
depends on the particular model.


title: Nested set complexes for posets and the Bier construction

abstract:
  We generalize the concept of combinatorial nested set complexes to posets and
exhibit the topological relationship between the arising nested set complexes
and the order complex of the underlying poset. In particular, a sufficient
condition is given so that this relationship is actually a subdivision. We use
the results to generalize the proof method of \v{C}uki\'c and Delucchi, so far
restricted to semilattices, for a result of Bj\"orner, Paffenholz, Sj\"ostrand
and Ziegler on the Bier construction on posets.


title: How long will a bubble be ?

abstract:
  A soap bubble is a metastable object that eventually breaks. Indeed, the
soapy water film thins until rupture, due to drainage and evaporation. In our
experimental investigations, floating bubbles at the surface of a liquid bath
have been considered. Their lifetime has been measured and reported with
respect to their radius. Large bubbles last longer than small ones. Moreover,
small bubbles have more predictable lifetimes than large ones. We propose a
general equation for that lifetime, based on the lubrication theory. The
evaporation is shown to be an essential process which determines the bubble
lifetime.


title:
Lepton Flavor Violation in the LHT - A Clear Distinction from
  Supersymmetry

abstract:
  The Littlest Higgs Model with T-Parity (LHT) contains new sources of flavor
and CP violation both in the quark and lepton sector. These have their origin
in interactions of ordinary fermions with mirror fermions mediated by new heavy
gauge bosons. Large deviations from the Standard Model (SM) are to be expected
in the lepton sector where tiny neutrino masses suppress the SM predictions by
many orders of magnitude below the experimentally accessible level. Here we
give a brief summary of LFV processes relevant for the foreseeable future and
point out that correlations between branching ratios of LFV decays in the LHT
exhibit a structure vastly different from their analogues in the MSSM, thus
allowing for a transparent distinction between these two models.


title: The Cauchy problem of f(R) gravity

abstract:
  The initial value problem of metric and Palatini f(R)gravity is studied by
using the dynamical equivalence between these theories and Brans-Dicke gravity.
The Cauchy problem is well-formulated for metric f(R)gravity in the presence of
matter and well-posed in vacuo. For Palatini f(R)gravity, instead, the Cauchy
problem is not well-formulated.


title:
Discovering Important Nodes Through Graph Entropy Encoded in Urban Space
  Syntax

abstract:
  Potentially influential spaces in the spatial networks of cities can be
detected by means of the entropy participation ratios. Local (connectivity) and
global (centrality) entropies are considered. While the connectivity entropy
has a tendency to increase with the city size, the centrality entropy is
decreasing that reflects the global connectedness of cities. In urban networks,
the local and global properties of nodes are positively correlated that
indicates the intelligibility of cities. Correlations between entropy
participation ratios can be used in purpose of intelligibility measurements and
city networks comparisons.


title: The eigenvalue spectrum for dynamical Chirally Improved fermions

abstract:
  We study the eigenvalues of Dirac operators in QCD with two mass degenerate
dynamical fermions. The gauge configurations have been obtained with HMC and
the so-called Chirally Improved fermionic action. We compare eigenvalues
obtained for the overlap Dirac operator on these configurations with those for
the Chirally Improved (CI) operator (studied earlier). Results of Random Matrix
Theory allow us to determine the chiral condensate.


title:
The New Horizons Pluto Kuiper belt Mission: An Overview with Historical
  Context

abstract:
  NASA's New Horizons (NH) Pluto-Kuiper belt (PKB) mission was launched on 19
January 2006 on a Jupiter Gravity Assist (JGA) trajectory toward the Pluto
system for a 14 July 2015 closest approach; Jupiter closest approach occurred
on 28 February 2007. It was competitively selected by NASA for development on
29 November 2001. New Horizons is the first mission to the Pluto system and the
Kuiper belt; and will complete the reconnaissance of the classical planets. The
~400 kg spacecraft carries seven scientific instruments, including imagers,
spectrometers, radio science, a plasma and particles suite, and a dust counter
built by university students. NH will study the Pluto system over a 5-month
period beginning in early 2015. Following Pluto, NH will go on to reconnoiter
one or two 30-50 kilometer diameter Kuiper belt Objects (KBOs), if NASA
approves an extended mission. If successful, NH will represent a watershed
development in the scientific exploration of a new class of bodies in the solar
system - dwarf planets, of worlds with exotic volatiles on their surfaces, of
rapidly (possibly hydrodynamically) escaping atmospheres, and of giant impact
derived satellite systems. It will also provide the first dust density
measurements beyond 18 AU, cratering records that shed light on both the
ancient and present-day KB impactor population down to tens of meters, and a
key comparator to the puzzlingly active, former dwarf planet (now satellite of
Neptune) called Triton, which is as large as Eris and Pluto.


title:
Periodic solutions for planar autonomous systems with nonsmooth periodic
  perturbations

abstract:
  In this paper we consider a class of planar autonomous systems having an
isolated limit cycle x_0 of smallest period T>0 such that the associated
linearized system around it has only one characteristic multiplier with
absolute value 1. We consider two functions, defined by means of the
eigenfunctions of the adjoint of the linearized system, and we formulate
conditions in terms of them in order to have the existence of two geometrically
distinct families of T-periodic solutions of the autonomous system when it is
perturbed by nonsmooth T-periodic nonlinear terms of small amplitude. We also
show the convergence of these periodic solutions to x_0 as the perturbation
disappears and we provide an estimation of the rate of convergence. The
employed methods are mainly based on the theory of topological degree and its
properties that allow less regularity on the data than that required by the
approach, commonly employed in the existing literature on this subject, based
on various versions of the implicit function theorem.


title:
Reply to comment on ``Competing Interactions, the Renormalization Group
  and the Isotropic-Nematic Phase Transition''

abstract:
  The focus of our work is to identify conditions for the presence of an
isotropic-nematic phase transition in the context of a generic system with
isotropic competing interactions. The comment 0709.4205 criticizes our results
by showing that the low temperature fluctuations of a stripe phase in 2d
diverge linearly in the thermodynamic limit. The analysis is restricted to the
stripe phase and does not apply to the central result of our letter. We show,
contrary to what is suggested in the comment, that the model introduced by D.
G. Barci and D. A. Stariolo in PRL98, 200604 (2007) undergoes an
isotropic-nematic phase transition in the Kosterlitz-Thouless universality
class.


title: Confirmation of Shannon's Mistake about Perfect Secrecy of One-time-pad

abstract: This paper has been withdrawn


title: Isometry classes of generalized associahedra

abstract:
  Let $(W,S)$ be a finite Coxeter system acting by reflections on an $\mathbb
R$-Euclidean space with simple roots $\Delta=\{\a_s | s\in S\}$ of the same
length and fundamental weights $\Delta^*=\{v_s | s\in S\}$. We set
$M(e)=\sum_{s\in S}\kappa_s v_s$, $\kappa_s>0$, and for $w\in W$ we set
$M(w)=w(M(e))$. The permutahedron $Perm(W)$ is the convex hull of the set
$\{M(w) | w\in W\}$. Given a Coxeter element $c\in W$, we have defined in a
previous work a generalized associahedron $Asso_c(W)$ whose normal fan is the
corresponding $c$-Cambrian fan $F_c$ defined by N. Reading. By construction,
$Asso_c(W)$ is obtained from $Perm(W)$ by removing some halfspaces according to
a rule prescribed by $c$. In this work, we classify the isometry classes of
these realizations. More precisely, for $(W,S)$ an irreducible finite Coxeter
system and $c,c'$ two Coxeter elements in $W$, we have that $Asso_{c}(W)$ and
$Asso_{c'}(W)$ are isometric if and only if $\mu(c') = c$ or
$\mu(c')=w_0c^{-1}w_0$ for $\mu$ an automorphism of the Coxeter graph of $W$
such that $\kappa_s=\kappa_{\mu(s)}$ for all $s\in S$. As a byproduct, we
classify the isometric Cambrian fans of $W$.


title: Towards $B \to V \gamma$ Decays at NNLO in SCET

abstract:
  We compute NNLO (${\cal O}(\alpha_s^2)$) corrections to the hard-scattering
kernels entering the QCD factorization formula for $B\to V\gamma$ decays, where
$V$ is a light vector meson. We give complete NNLO results for the dipole
operators $Q_7$ and $Q_8$, and partial results for $Q_1$ valid in the
large-$\beta_0$ limit and neglecting the NNLO correction from hard spectator
scattering. Large perturbative logarithms in the hard-scattering kernels are
identified and resummed using soft-collinear effective theory. We use our
results to estimate the branching fractions for $B\to K^*\gamma$ and $B_s\to
\phi\gamma$ decays at NNLO and compare them with the current experimental data.


title:
Effects of CMB temperature uncertainties on cosmological parameter
  estimation

abstract:
  We estimate the effect of the experimental uncertainty in the measurement of
the temperature of the cosmic microwave background (CMB) on the extraction of
cosmological parameters from future CMB surveys. We find that even for an ideal
experiment limited only by cosmic variance up to l = 2500 for both the
temperature and polarisation measurements, the projected cosmological parameter
errors are remarkably robust against the uncertainty of 1 mK in the FIRAS
instrument's CMB temperature monopole measurement. The maximum degradation in
sensitivity is 20%, for the baryon density estimate, relative to the case in
which the monopole is known infinitely well. While this degradation is
acceptable, we note that reducing the uncertainty in the current temperature
measurement by a factor of five will bring it down to the per cent level. We
also estimate the effect of the uncertainty in the dipole temperature
measurement. Assuming the overall calibration of the data to be dominated by
the dipole error of 0.2% from FIRAS, the sensitivity degradation is
insignificant and does not exceed 10% in any parameter direction.


title: Fermi-Fermi Mixtures in the Strong Attraction Limit

abstract:
  The phase diagrams of low density Fermi-Fermi mixtures with equal or unequal
masses and equal or unequal populations are described at zero and finite
temperatures in the strong attraction limit. In this limit, the Fermi-Fermi
mixture can be described by a weakly interacting Bose-Fermi mixture, where the
bosons correspond to Feshbach molecules and the fermions correspond to excess
atoms. First, we discuss the three and four fermion scattering processes, and
use the exact boson-fermion and boson-boson scattering lengths to generate the
phase diagrams in terms of the underlying fermion-fermion scattering length. In
three dimensions, in addition to the normal and uniform superfluid phases, we
find two stable non-uniform states corresponding to (1) phase separation
between pure unpaired (excess) and pure paired fermions (molecular bosons); and
(2) phase separation between pure excess fermions and a mixture of excess
fermions and molecular bosons. Lastly, we also discuss the effects of the
trapping potential in the density profiles of condensed and non-condensed
molecular bosons, and excess fermions at zero and finite temperatures, and
discuss possible implications of our findings to experiments involving mixtures
of ultracold fermions.


title:
Probabilistic annotation of protein sequences based on functional
  classifications

abstract:
  BACKGROUND: One of the most evident achievements of bioinformatics is the
development of methods that transfer biological knowledge from characterised
proteins to uncharacterised sequences. This mode of protein function assignment
is mostly based on the detection of sequence similarity and the premise that
functional properties are conserved during evolution. Most automatic approaches
developed to date rely on the identification of clusters of homologous proteins
and the mapping of new proteins onto these clusters, which are expected to
share functional characteristics. RESULTS: Here, we inverse the logic of this
process, by considering the mapping of sequences directly to a functional
classification instead of mapping functions to a sequence clustering. In this
mode, the starting point is a database of labelled proteins according to a
functional classification scheme, and the subsequent use of sequence similarity
allows defining the membership of new proteins to these functional classes. In
this framework, we define the Correspondence Indicators as measures of
relationship between sequence and function and further formulate two Bayesian
approaches to estimate the probability for a sequence of unknown function to
belong to a functional class. This approach allows the parametrisation of
different sequence search strategies and provides a direct measure of
annotation error rates. We validate this approach with a database of enzymes
labelled by their corresponding four-digit EC numbers and analyse specific
cases. CONCLUSION: The performance of this method is significantly higher than
the simple strategy consisting in transferring the annotation from the highest
scoring BLAST match and is expected to find applications in automated
functional annotation pipelines.


title: Precision measurements of alphas at HERA

abstract:
  Recent determinations of alphas(Mz) from the H1 and ZEUS Collaborations using
inclusive-jet cross-section measurements in neutral current deep inelastic
scattering at high Q2 are presented. A combined value of alphas(mz)=0.1198 +-
0.0019 (exp.) +- 0.0026 (th.) was obtained from these measurements. The
determinations of alphas at various scales clearly show the running of the
coupling from HERA jet data alone and in agreement with the prediction of QCD.


title: Dynamical Electron Mass in a Strong Magnetic Field

abstract:
  Motivated by recent interest in understanding properties of strongly
magnetized matter, we study the dynamical electron mass generated through
approximate chiral symmetry breaking in QED in a strong magnetic field. We
reliably calculate the dynamical electron mass by numerically solving the
nonperturbative Schwinger-Dyson equations in a consistent truncation within the
lowest Landau level approximation. It is shown that the generation of dynamical
electron mass in a strong magnetic field is significantly enhanced by the
perturbative electron mass that explicitly breaks chiral symmetry in the
absence of a magnetic field.


title:
The Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI)
  on the New Horizons Mission

abstract:
  The Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI)
comprises the hardware and accompanying science investigation on the New
Horizons spacecraft to measure pick-up ions from Pluto's outgassing atmosphere.
To the extent that Pluto retains its characteristics similar to those of a
"heavy comet" as detected in stellar occultations since the early 1980s, these
measurements will characterize the neutral atmosphere of Pluto while providing
a consistency check on the atmospheric escape rate at the encounter epoch with
that deduced from the atmospheric structure at lower altitudes by the ALICE,
REX, and SWAP experiments on New Horizons. In addition, PEPSSI will
characterize any extended ionosphere and solar wind interaction while also
characterizing the energetic particle environment of Pluto, Charon, and their
associated system. First proposed for development for the Pluto Express mission
in September 1993, what became the PEPSSI instrument went through a number of
development stages to meet the requirements of such an instrument for a mission
to Pluto while minimizing the required spacecraft resources. The PEPSSI
instrument provides for measurements of ions (with compositional information)
and electrons from 10s of keV to ~1 MeV in a 120 deg x 12 deg fan-shaped beam
in six sectors for 1.5 kg and ~2.5 W.


title: A converse approach to the calculation of NMR shielding tensors

abstract:
  We introduce an alternative approach to the first-principles calculation of
NMR shielding tensors. These are obtained from the derivative of the orbital
magnetization with respect to the application of a microscopic, localized
magnetic dipole. The approach is simple, general, and can be applied to either
isolated or periodic systems. Calculated results for simple hydrocarbons,
crystalline diamond, and liquid water show very good agreement with established
methods and experimental results.


title: Fast-ion conduction and flexibility of glassy networks

abstract:
  We observe two thresholds in the variations of electrical conductivity of dry
solid electrolyte (AgI)x(AgPO3)1-x glasses, when the AgI additive concentration
x increases to 9.5% and to 37.8%. Raman scattering complemented by calorimetric
measurements confirm that these thresholds are signatures of the rigidity phase
transitions; at x = 9.5% from a stressed rigid to an isostatically (stress
free) rigid phase, and at x = 37.8% from isostatically rigid to a flexible
phase. In the flexible phase, the electrical conductivity seems to increase as
a power of x, this is in good agreement with the theoretical prediction based
on 3d percolation.


title:
On the rate of convergence of periodic solutions in perturbed autonomous
  systems as the perturbation vanishes

abstract:
  We consider an autonomous system in R^n having a limit cycle x_0 of period
T>0 which is nondegenerate in a suitable sense. We then consider the perturbed
system obtained by adding to the autonomous system a T-periodic, not
necessarily differentiable, term whose amplitude tends to 0 as a small
parameter e>0 tends to 0. Assuming the existence of a T-periodic solution x_e
of the perturbed system and its convergence to x_0 as e->0, the paper
establishes the existence of d_e->0 as e->0 such that \|x_e(t+d_e)-x_0(t)\|<=eM
for some M>0 and any e>0 sufficiently small.


title:
On the maximal number of three-term arithmetic progressions in subsets
  of Z/pZ

abstract:
  Let a be a real number between 0 and 1. Ernie Croot showed that the quantity
\max_A #(3-term arithmetic progressions in A)/p^2, where A ranges over all
subsets of Z/pZ of size at most a*p, tends to a limit as p tends to infinity
through primes. Writing c(a) for this limit, we show that c(a) = a^2/2 provided
that a is smaller than some absolute constant. In fact we prove rather more,
establishing a structure theorem for sets having the maximal number of 3-term
progressions amongst all subsets of Z/pZ of cardinality m, provided that m <
c*p.


title: Isolated Leptons and Missing P_{T} at HERA

abstract:
  The search for events containing isolated leptons (electrons or muons) and
missing transverse momentum produced in e^{\pm}p collisions is performed
individually and in a common phase space with the H1 and ZEUS detectors at HERA
in the period 1994--2007. The analysed H1+ZEUS data sample corresponds to an
integrated luminosity of 0.97 fb^{-1}, and composes of the complete high energy
data from the HERA programme. A total of 87 events are observed in the data,
compared to a Standard Model (SM) prediction of 92.7 \pm 11.2. At large
hadronic transverse momentum P_{T}^{X} > 25 GeV in the e^{+}p data, luminosity
0.58 fb^{-1}, 23 data events are observed compared to a SM prediction of 14.6
\pm 1.9. Production cross section measurements of events containing isolated
leptons and missing transverse momentum and single W production, as well as W
polarisation fractions performed by the H1 Collaboration are also presented.
The H1 isolated lepton events are also examined in the context of a search for
single top production.


title: Stout Smearing for Twisted Mass Fermions

abstract:
  The effect of Stout smearing is investigated in numerical simulations with
twisted mass Wilson quarks. The phase transition near zero quark mass is
studied on 12^3x24, 16^3x32 and 24^3x48 lattices at lattice spacings a = 0.1 -
0.125 fm.


title: Invariants of differential equations defined by vector fields

abstract:
  We determine the most general group of equivalence transformations for a
family of differential equations defined by an arbitrary vector field on a
manifold. We also find all invariants and differential invariants for this
group up to the second order. A result on the characterization of classes of
these equations by the invariant functions is also given.


title: The Amplitude Mode in the Quantum Phase Model

abstract:
  We derive the collective low energy excitations of the quantum phase model of
interacting lattice bosons within the superfluid state using a dynamical
variational approach. We recover the well known sound (or Goldstone) mode and
derive a gapped (Higgs type) mode that was overlooked in previous studies of
the quantum phase model. This mode is relevant to ultracold atoms in a strong
optical lattice potential. We predict the signature of the gapped mode in
lattice modulation experiments and show how it evolves with increasing
interaction strength.


title: Pressure Raman effects and internal stress in network glasses

abstract:
  Raman scattering from binary GexSe1-x glasses under hydrostatic pressure
shows onset of a steady increase in the frequency of modes of corner-sharing
GeSe4 tetrahedral units when the external pressure P exceeds a threshold value
Pc. The threshold pressure Pc(x) decreases with x in the 0.15 < x < 0.20 range,
nearly vanishes in the 0.20 < x < 0.25 range, and then increases in the 0.25 <
x < 1/3 range. These Pc(x) trends closely track those in the non-reversing
enthalpy, DHnr(x), near glass transitions (Tgs), and in particular, both
DHnr(x) and Pc(x) vanish in the reversibility window (0.20 < x < 0.25). It is
suggested that Pc provides a measure of stress at the Raman active units; and
its vanishing in the reversibility window suggests that these units are part of
an isostatically rigid backbone. Isostaticity also accounts for the non-aging
behavior of glasses observed in the reversibility window.


title: The VERITAS Trigger System

abstract:
  The VERITAS gamma-ray observatory, situated in southern Arizona, is an array
of four 12m diameter imaging Cherenkov telescopes, each with a 499-pixel
photomultiplier-tube camera. The instrument is designed to detect astrophysical
gamma rays at energies above 100 GeV. At the low end of the VERITAS energy
range, fluctuations in the night sky background light and single muons from
cosmic-ray showers constitute significant backgrounds. VERITAS employs a
three-tier trigger system to reduce the rate of these background events: an
initial trigger which acts at the single pixel level, a pattern trigger which
acts on the relative timing and pixel level, a pattern trigger which acts on
the relative timing and distribution of pixel-level triggers within a single
telescope camera, and an array-level trigger which requires simultaneous
observation of an air-shower event in multiple telescopes. This final
coincidence requirement significantly reduces the rate of background events,
particularly those due to single muons. In this paper, the implementation of
all levels of the VERITAS trigger system is discussed and their joint
performance is characterized.


title: Nonequilibrium Free Energy-Like Functional for the KPZ Equation

abstract:
  Opposing to a (common) belief against the existence of a thermodynamic-like
potential for the KPZ equation, here we present a derivation for such a
functional. With its knowledge we prove some global shift invariance properties
previously conjectured by other authors. The procedure could be extended in
order to derive a more general form of such a functional leading to other known
related nonlinear kinetic equations. Exploiting the KPZ's functional, and for
arbitrary dimension, we have obtained the exact form of the stationary
probability distribution function and have shown a couple of examples of how it
is possible to exploit it in order to obtain relevant results like finding
support to the conjecture that in the strong coupling regime a critical
dimension doesn't exists.


title: A clean, bright, and versatile source of neutron decay products

abstract:
  We present a case study on a new type of cold neutron beam station for the
investigation of angular correlations in the beta-decay of free neutrons. With
this beam station, called PERC, the 'active decay volume' lies inside the
neutron guide, and the charged neutron decay products are magnetically guided
towards the end of the neutron guide. Hence, the guide delivers at its exit a
beam of decay electrons and protons, under well-defined and precisely variable
conditions, which can be well separated from the cold neutron beam. In this way
a general-purpose source of neutron decay products is obtained which can be
used for various different experiments in neutron decay correlation
spectroscopy. A gain in phase space density of several orders of magnitude can
be achieved with PERC, as compared to existing neutron decay spectrometers.
Neutron beam related background is separately measurable in PERC, and magnetic
mirror effects on the charged neutron decay products and edge effects in the
active neutron beam volume are both strongly suppressed. Therefore the spectra
and angular distributions of the emerging decay particles will be
distortion-free on the level of 10^-4, more than 10 times better than achieved
today.


title: Raman scattering as a probe of intermediate phases in glassy networks

abstract:
  Bulk glass formation occurs over a very small part of phase space, and "good"
glasses (which form even at low quench rates ~ 10K/sec) select an even smaller
part of that accessible phase space. An axiomatic theory provides the physical
basis of glass formation, and identifies these sweet spots of glass formation
with existence of rigid but stress-free networks for which experimental
evidence is rapidly emerging. Recently, theory and experiment have come
together to show that these sweet spots of glass formation occur over a range
of chemical compositions identified as Intermediate Phases. These ranges appear
to be controlled by elements of local and medium range molecular structures
that form isostatically rigid networks. Intermediate Phase glasses possess
non-hysteretic glass transitions (Tgs) that do not age much. Raman scattering
has played a pivotal role in elucidating molecular structure of glasses in
general, and in identifying domains of Intermediate Phases. Experiments reveal
these phases to possess sharp phase boundaries and to be characterized by an
optical elasticity that varies with network mean coordination number, r, as
power-law. In this review, we provide examples in chalcogenide and oxide glass
systems where these phases along with optical elasticity power-laws have been
established. Intermediate Phase glasses represent self-organized nanostructured
functional materials optimized by nature.


title: Aging, Fragility and Reversibility Window in Bulk Alloy Glasses

abstract:
  Non-reversing relaxation enthalpies (DHnr) at glass transitions Tg(x) in the
PxGexSe1-2x ternary display wide, sharp and deep global minima (~ 0) in the
0.09 < x < 0.145 range, within which Tgs become thermally reversing. In this
reversibility window, glasses are found not to age, in contrast to aging
observed for fragile glass compositions outside the window. Thermal
reversibility and lack of aging seem to be paradigms of self-organization which
molecular glasses share with protein structures which repetitively and
reversibly change conformation near Tg and the folding temperature
respectively.


title:
Predictions of the causal entropic principle for environmental
  conditions of the universe

abstract:
  The causal entropic principle has been proposed as a superior alternative to
the anthropic principle for understanding the magnitude of the cosmological
constant. In this approach, the probability to create observers is assumed to
be proportional to the entropy production \Delta S in a maximal causally
connected region -- the causal diamond. We improve on the original treatment by
better quantifying the entropy production due to stars, using an analytic model
for the star formation history which accurately accounts for changes in
cosmological parameters. We calculate the dependence of \Delta S on the density
contrast Q=\delta\rho/\rho, and find that our universe is much closer to the
most probable value of Q than in the usual anthropic approach and that
probabilities are relatively weakly dependent on this amplitude. In addition,
we make first estimates of the dependence of \Delta S on the baryon fraction
and overall matter abundance. Finally, we also explore the possibility that
decays of dark matter, suggested by various observed gamma ray excesses, might
produce a comparable amount of entropy to stars.


title: Hydrogen like classification for light nonstrange mesons

abstract:
  The recent experimental results on the spectrum of highly excited light
nonstrange mesons are known to reveal a high degree of degeneracy among
different groups of states. We revise some suggestions about the nature of the
phenomenon and put the relevant ideas into the final shape. The full group of
approximate mass degeneracies is argued to be $SU(2)_f\times I\times O(4)$,
where $I$ is the degeneracy of isosinglets and isotriplets and O(4) is the
degeneracy group of the relativistic hydrogen atom. We discuss the dynamical
origin and consequences of considered symmetry with a special emphasis on
distinctions of this symmetry from the so-called chiral symmetry restoration
scenario.


title:
Variation of the bonding interactions and magnetism in GdAuX (X = Mg,
  Cd, and In)

abstract:
  Results of first-principles electronic structure calculations for the
isotypic compounds GdAuX (ZrNiAl type, X = Mg, Cd, and In) are presented. We
report on a systematic examination of the electronic structure and nature of
the bonding in these intermetallics. Our calculations indicate a metallic state
for all of the compounds. We find that the indium in GdAuIn and magnesium in
GdAuMg have significant bonding interactions with Au. We have also identified
In s lone pair in GdAuIn has more localized behaviour as compared with Mg s in
GdAuMg. The magnetic properties are well described within the local density
approximation.


title: Supersymmetric Gauge Theories, Intersecting Branes and Free Fermions

abstract:
  We show that various holomorphic quantities in supersymmetric gauge theories
can be conveniently computed by configurations of D4-branes and D6-branes.
These D-branes intersect along a Riemann surface that is described by a
holomorphic curve in a complex surface. The resulting I-brane carries
two-dimensional chiral fermions on its world-volume. This system can be mapped
directly to the topological string on a large class of non-compact Calabi-Yau
manifolds. Inclusion of the string coupling constant corresponds to turning on
a constant B-field on the complex surface, which makes this space
non-commutative. Including all string loop corrections the free fermion theory
is elegantly formulated in terms of holonomic D-modules that replace the
classical holomorphic curve in the quantum case.


title: Comparative Study of Cities as Complex Networks

abstract:
  Degree distributions of graph representations for compact urban patterns are
scale-dependent. Therefore, the degree statistics alone does not give us the
enough information to reach a qualified conclusion on the structure of urban
spatial networks. We investigate the statistics of far-away neighbors and
propose the new method for automatic structural classification of cities.


title:
Hawking radiation as tunneling for spherically symmetric black holes: A
  generalized treatment

abstract:
  We present a derivation of Hawking radiation through tunneling mechanism for
a general class of asymptotically flat, spherically symmetric spacetimes. The
tunneling rate $\Gamma \sim \exp{(\Delta S)}$ arises as a consequence of the
first law of thermodynamics, TdS=dE + PdV. Therefore, this approach
demonstrates how tunneling is intimately connected with the first law of
thermodynamics through the principle of conservation of energy. The analysis is
also generally applicable to any reasonable theory of gravity so long as the
first law of thermodynamics for horizons holds in the form, TdS=dE + PdV.


title:
On soliton structure of higher order (2+1)-dimensional equations of a
  relaxing medium beneath high-frequency perturbations

abstract:
  We investigate the soliton structure of novel (2+1)-dimensional nonlinear
partial differential evolution(NLPDE) equations which may govern the behavior
of a barothropic relaxing medium beneath high-frequency perturbations. As a
result, we may derive some soliton solutions amongst which three typical
pattern formations with loop-, cusp- and hump-like shapes.


title: Understanding the Forward Muon Deficit in Coherent Pion Production

abstract:
  For any inelastic process $v_{\ell} + I \to \ell^- + F$ with $m_{\ell} = 0$,
the cross section at $\theta_{\ell} = 0$ is given by Adler's PCAC theorem.
Inclusion of the lepton mass has a dynamical effect (``PCAC-screening'') caused
by interference of spin-zero ($\pi^+$) and spin-one exchanges. This effect may
be relevant to the forward suppression reported in recent experiments.


title:
Cavity Field in Molecular Liquids. When a Polar Liquid Becomes a
  Dielectric?

abstract:
  We present the results of an analytical theory and simulations of the field
inside a cavity created in a dipolar liquid placed in a uniform external
electric field. The analytical theory shows that the limit of continuum
electrostatics is reached through a singularity in the microscopic response
function responsible for a non-decaying longitudinal polarization wave. Fields
in microscopic cavities are much different from macroscopic predictions, and
low-polarity dielectrics are predicted to have a continuum limit distinct from
the solution of Maxwell's equations. Computer Monte Carlo simulations never
reach the standard continuum limit and instead converge to the new continuum
solution with increasing cavity size.


title: Heavy-Quark Kinetics at RHIC and LHC

abstract:
  In ultrarelativistic nuclear collisions heavy quarks are produced out of
thermal equilibrium in the very early stage of the reaction and their
thermalization time was expected to be considerably larger than that of light
quarks. On the other hand, a strongly-interacting QGP can be envisaged in the
heavy quark sector due to the presence of heavy-light hadron-like resonances in
the QGP for temperatures up to $\sim$$2 T_{C}$. We investigate the consequences
of such states employing a relativistic Langevin simulation. Hadronization is
modeled by a coalescence-fragmentation scheme. We present the predictions for
the nuclear modification factor and elliptic flow of $D$ and $B$ mesons at LHC
energies and compare the results with the successful predictions of this model
for RHIC conditions. We find similar heavy-quark thermalization effects at LHC
and RHIC.


title: Solar System Constraints on f(G) Dark Energy

abstract:
  Corrections to solar system gravity are derived for f(G) gravity theories, in
which a function of the Gauss-Bonnet curvature term is added to the
gravitational action. Their effects on Newton's law, as felt by the planets,
and on the frequency shift of signals from the Cassini spacecraft, are both
determined. Despite the fact that the Gauss-Bonnet term is quadratic in
curvature, the resulting constraints are substantial. It is shown that they
practically rule out f(G) as a natural explanation for the late-time
acceleration of the universe. Possible exceptions are when f(G) reduces to
something very close to a cosmological constant, or if the form of the function
f is exceptionally fine-tuned.


title: What are the degrees of freedom in the partonic fluid at RHIC ?

abstract:
  Recent RHIC data show evidence of multiple hadron production mechanisms in
heavy ion collisions compared to simple fragmentation in vacuum. I will review
the measurements of collective flow, high momentum quenching, and two particle
angular correlations to show that neither thermal production nor string
fragmentation can describe the abundances, the angular distributions or the
kinematic properties of all hadrons produced at RHIC. The proposed new
hadronization mechanisms not only serve as evidence for a deconfined partonic
phase of matter, but also for strong coupling of the degrees of freedom in the
deconfined phase. I will point out a surprising lack of flavor dependence in
these properties at RHIC, though, which might have to lead to further revisions
of our understanding of the relevant degrees of freedom in the partonic phase
and during the hadronization process.


title: Studies of Direct Cherenkov Emission with VERITAS

abstract:
  Ground-based composition measurements of high-energy cosmic rays can be
significantly improved by using the direct Cherenkov method. This technique
targets the Cherenkov light produced by the primary particle prior to its
production of an extensive air shower. With the appropriate time and angular
resolution, the direct Cherenkov photons can be separated from those produced
in the extensiveair shower. By utilizing the 0.15 degree angular and 2
nanosecond timing resolution of the very high energy gamma-ray telescope
system, VERITAS, the charge and energy of cosmic rays at TeV energies can be
identified on an event-by-event basis. Results from a preliminary search for
direct Cherenkov events are discussed.


title: Meson spectroscopy with derivative quark sources

abstract:
  We present results for masses of light mesons obtained with the variational
method using an enhanced basis of interpolating field operators with different
quark smearings. The interpolators are constructed from Jacobi-smeared quarks
of a Gaussian type as well as from derivative quark sources obtained by a
covariant derivative acting on the Gaussian sources. For our analysis we use
quenched gauge configurations with Chirally Improved quarks and the
Luescher-Weisz gauge action on a 16^3 x 32 lattice with a = 0.148 fm. We
discuss the influence of derivative sources on the overlap with excited states.