title: Model selection for quantum homodyne tomography

abstract:
  This paper deals with a non-parametric problem coming from physics, namely
quantum tomography. That consists in determining the quantum state of a mode of
light through a homodyne measurement. We apply several model selection
procedures: penalized projection estimators, where we may use pattern functions
or wavelets, and penalized maximum likelihood estimators. In all these cases,
we get oracle inequalities. In the former we also have a polynomial rate of
convergence for the non-parametric problem. We finish the paper with
applications of similar ideas to the calibration of a photocounter, a
measurement apparatus counting the number of photons in a beam. Here the
mathematical problem reduces similarly to a non-parametric missing data
problem. We again get oracle inequalities, and better speed if the photocounter
is good.


title: C^0-rigidity of Poisson brackets

abstract:
  Consider a functional associating to a pair of compactly supported smooth
functions on a symplectic manifold the maximum of their Poisson bracket. We
show that this functional is lower semi-continuous with respect to the product
uniform (C^0) norm on the space of pairs of such functions. This extends
previous results of Cardin-Viterbo and Zapolsky. The proof involves theory of
geodesics of the Hofer metric on the group of Hamiltonian diffeomorphisms. We
also discuss a failure of a similar semi-continuity phenomenon for multiple
Poisson brackets of three or more functions.


title: Topological susceptibility in two-flavor QCD

abstract:
  We compute the topological susceptibility in QCD with two flavors of
dynamical fermions using numerical simulation with overlap fermions.


title: On the Transition to Turbulence of Oscillatory Flow of Liquid Helium-4

abstract:
  Oscillating solid bodies have frequently been used for studying the
properties of normal and superfluid helium. In particular, the transition from
laminar flow to turbulence has attracted much interest recently. The purpose of
this note is to review several central features of this transition in
oscillatory flow, which have been inaccurately formulated in some recent work.


title: Causal hydrodynamics of gauge theory plasmas from AdS/CFT duality

abstract:
  We study causal hydrodynamics (Israel-Stewart theory) of gauge theory plasmas
from the AdS/CFT duality. Causal hydrodynamics requires new transport
coefficients (relaxation times) and we compute them for a number of
supersymmetric gauge theories including the N=4 SYM. However, the relaxation
times obtained from the "shear mode" do not agree with the ones from the "sound
mode," which implies that the Israel-Stewart theory is not a sufficient
framework to describe the gauge theory plasmas.


title:
Comment on "Viscous hydrodynamics relaxation time from AdS/CFT
  correspondence"

abstract:
  This is a comment to hep-th/0703243. The paper determined the relaxation time
tau_pi of the shear viscous stress for the N=4 SYM from AdS/CFT correspondence.
The purpose of this comment is to point out that the value of tau_pi is 3 times
larger than their result if one takes into account an additional term in the
hydrodynamic equation.


title: Non-diagonal reflection for the non-critical XXZ model

abstract:
  The most general physical boundary $S$-matrix for the open XXZ spin chain in
the non-critical regime ($\cosh (\eta)>1$) is derived starting from the bare
Bethe ansazt equations. The boundary $S$-matrix as expected is expressed in
terms of $\Gamma_q$-functions. In the isotropic limit corresponding results for
the open XXX chain are also reproduced.

categories: hep-th cond-mat.stat-mech math-ph math.MP nlin.SI


title:
DNA ejection from bacteriophage: towards a general behavior for osmotic
  suppression experiments

abstract:
  We present in this work in vitro measurements of the force ejecting DNA from
two distinct bacteriophages (T5 and lambda) using the smotic-suppression
technique. Our data are analyzed by revisiting the current theories of DNA
packaging in spherical capsids. In particular we show that a simplified
analytical model based on bending considerations only is able to account
quantitatively for the experimental findings. Physical and biological
consequences are discussed.


title:
Single-Bottleneck Approximation for Driven Lattice Gases with Disorder
  and Open Boundary Conditions

abstract:
  We investigate the effects of disorder on driven lattice gases with open
boundaries using the totally asymmetric simple exclusion process as a
paradigmatic example. Disorder is realized by randomly distributed defect sites
with reduced hopping rate. In contrast to equilibrium, even macroscopic
quantities in disordered non-equilibrium systems depend sensitively on the
defect sample. We study the current as function of the entry and exit rates and
the realization of disorder and find that it is, in leading order, determined
by the longest stretch of consecutive defect sites (single-bottleneck
approximation, SBA). Using results from extreme value statistics the SBA allows
to study ensembles with fixed defect density which gives accurate results, e.g.
for the expectation value of the current. Corrections to SBA come from
effective interactions of bottlenecks close to the longest one. Defects close
to the boundaries can be described by effective boundary rates and lead to
shifts of the phase transitions. Finally it is shown that the SBA also works
for more complex models. As an example we discuss a model with internal states
that has been proposed to describe transport of the kinesin KIF1A.


title: Accretion funnels onto weakly magnetized young stars

abstract:
  Aims : We re-examine the conditions required to steadily deviate an accretion
flow from a circumstellar disc into a magnetospheric funnel flow onto a slow
rotating young forming star. Methods : New analytical constraints on the
formation of accretion funnels flows due to the presence of a dipolar stellar
magnetic field disrupting the disc are derived. The Versatile Advection Code is
used to confirm these constraints numerically. Axisymmetric MHD simulations are
performed, where a stellar dipole field enters the resistive accretion disc,
whose structure is self-consistently computed. Results : The analytical
criterion derived allows to predict a priori the position of the truncation
radius from a non perturbative accretion disc model. Accretion funnels are
found to be robust features which occur below the co-rotation radius, where the
stellar poloidal magnetic pressure becomes both at equipartition with the disc
thermal pressure and is comparable to the disc poloidal ram pressure. We
confirm the results of Romanova et al. 2002 and find accretion funnels for
stellar dipole fields as low as 140 G in the low accretion rate limit of
$10^{-9} M_\odot.yr^{-1}$. With our present numerical setup with no disc
magnetic field, we found no evidence of winds, neither disc driven nor X-winds,
and the star is only spun up by its interaction with the disc. Conclusions :
Weak dipole fields, similar in magnitude to those observed, lead to the
development of accretion funnel flows in weakly accreting T Tauri stars.
However, the higher accretion observed for most T Tauri stars (${\dot M} \sim
10^{-8} M_\odot.yr^{-1}$) requires either larger stellar field strength and/or
different magnetic topologies to allow for magnetospheric accretion.


title:
Absorption-Fluctuation Theorem for Nuclear Reactions: Brink-Axel,
  Incomplete Fusion and All That

abstract:
  We discuss the connection between absorption, averages and fluctuations in
nuclear reactions. The fluctuations in the entrance channel result in the
compound nucleus, Hauser-Feshbach, cross section, the fluctuations in the
intermediate channels, result in modifications of multistep reaction cross
sections, while the fluctuations in the final channel result in hybrid cross
sections that can be used to describe incomplete fusion reactions. We discuss
the latter in details and comment on the validity of the assumptions used in
the develpoment of the Surrogate method. We also discuss the theory of
multistep reactions with regards to intermediate state fluctuations and the
energy dependence and non-locality of the intermediate channels optical
potentials.


title: A Class of LULU Operators on Multi-Dimensional Arrays

abstract:
  The LULU operators for sequences are extended to multi-dimensional arrays via
the morphological concept of connection in a way which preserves their
essential properties, e.g. they are separators and form a four element fully
ordered semi-group. The power of the operators is demonstrated by deriving a
total variation preserving discrete pulse decomposition of images.


title: Dynamical Wave Function Collapse Models in Quantum Measure Theory

abstract:
  The structure of Collapse Models is investigated in the framework of Quantum
Measure Theory, a histories-based approach to quantum mechanics. The underlying
structure of coupled classical and quantum systems is elucidated in this
approach which puts both systems on a spacetime footing. The nature of the
coupling is exposed: the classical histories have no dynamics of their own but
are simply tied, more or less closely, to the quantum histories.


title:
Coherent adiabatic theory of two-electron quantum dot molecules in
  external spin baths

abstract:
  We derive an accurate molecular orbital based expression for the coherent
time evolution of a two-electron wave function in a quantum dot molecule where
the electrons interact with each other, with external time dependent
electromagnetic fields and with a surrounding nuclear spin reservoir. The
theory allows for direct numerical modeling of the decoherence in quantum dots
due to hyperfine interactions. Calculations result in good agreement with
recent singlet-triplet dephasing experiments by Laird et. al. [Phys. Rev. Lett.
97, 056801 (2006)], as well as analytical model calculations. Furthermore, it
is shown that using a much faster electric switch than applied in these
experiments will transfer the initial state to excited states where the
hyperfine singlet-triplet mixing is negligible.


title: Density fluctuations and chiral phase transition

abstract:
  Based on an effective QCD Lagrangian we discuss the properties of charge
density fluctuations in the vicinity of chiral phase transition. We explore
thermodynamics in the presence of spinodal phase separation. We show that
appearance of spinodal decomposition in a non-equilibrium first order phase
transition results in divergence of the charge density fluctuations related
with the electric charge and baryon number conservation. Consequently,
divergent fluctuations at the chiral phase transition are not only attributed
to the critical end point but are also there along the first order phase
transition if the spinodal phase separation take place. Based on the mean field
dynamics, the critical exponents for these singular behavior of charge
susceptibilities are also discussed.


title:
Masses of radiation pressure supported stars in extreme relativistic
  realm

abstract:
  We discuss that in the extreme relativistic limit, i.e., when z >>1, where z
is the surface gravitational redshift, there could be radiation pressure
supported and dominated stars with arbitrary gravitational mass, high or low.
Such Objects are called Eternally Collapsing Objects (ECOs). ECOs are
practically as compact as Schwarzschil Black Holes (BH) and, observationally,
are likely to be mistaken as BHs. Further since any object undergoing continued
collapse must first become an ECO before becoming a true BH state charcterized
by M=0, the observed BH Candidates are ECOs.


title: Defect-induced ferromagnetism in fullerenes

abstract:
  Based on the ab initio electronic structure calculations the picture of
ferromagnetism in polimerized C60 is proposed which seems to explain the whole
set of controversial experimental data. We have demonstrated that, in contrast
with cubic fullerene, in rhombohedral C60 the segregation of iron atoms is
energetically unprofitable which is a strong argument in favor of intrinsic
character of carbon ferromagnetism which can be caused by vacancies with
unpaired magnetic electrons. It is shown that: (i) energy formation of the
vacancies in the rhombohedral phase of C60 is essentially smaller than in the
cubic phase, (ii) there is a strong ferromagnetic exchange interactions between
carbon cages containing the vacancies, and (iii) the fusion of the magnetic
vacancies into nonmagnetic bivacancy is energetically profitable. The latter
can explain a fragility of the ferromagnetism.


title:
Attractive nearest-neighbor spin systems on the integers in a randomly
  evolving environment

abstract:
  We consider spin systems on $\Z$ (i.e.\ interacting particle systems on $\Z$
in which each coordinate only has two possible values and only one coordinate
changes in each transition) whose rates are determined by another process,
called a background process. A canonical example is the so called contact
process in randomly evolving environment (CPREE), introduced and analysed by E.
Broman and furthermore studied by J. Steif and the author, where the marginals
of the background process independently evolve as 2-state Markov chains and
determine the recovery rates for a contact process. We prove that under certain
conditions on the rates there are at most two extremal stationary
distributions. The proof follows closely the ideas of Liggett's proof of a
corresponding theorem for spin systems on $\Z$ without a background process.


title: Recent Result in QCD Thermodynamics from the Lattice

abstract:
  Recent results on QCD thermodynamics are presented. The nature of the T>0
transition is determined, which turns out to be an analytic cross-over. The
absolute scale for this transition is calculated. The results were obtained by
using a Symanzik improved gauge and stout-link improved fermionic action. In
order to approach the continuum limit four different sets of lattice spacings
were used with temporal extensions N_t=4, 6, 8 and 10 (they correspond to
lattice spacings a \sim 0.3, 0.2, 0.15 and 0.12 fm). The equation of state is
determined on N_t=4 and 6 lattices. The importance of the continuum limit for
different results (critical endpoint, colour superconducting phase) at
non-vanishing baryonic densities is discussed.


title:
Distortion of the p-mode peak profiles by the solar-cycle frequency
  shifts: do we need to worry?

abstract:
  We seek to address whether solar-cycle frequency shifts of the Sun's low-l p
modes `distort' the underlying shapes of the mode peaks, when those peaks are
observed in power frequency spectra made from data spanning large fractions, or
more, of the cycle period. We present analytical descriptions of the expected
profiles, and validate the predictions through use of artificial seismic
timeseries data, in which temporal variations of the oscillator frequencies are
introduced. Our main finding is that for the Sun-like frequency shifts the
distortion of the asymmetrical Lorentzian-like profiles is very small, but also
just detectible. Our analysis indicates that by fitting modes to the usual
Lorentzian-like models -- which do not allow for the distortion -- rather than
new models we derive, there is a bias in the mode height and linewidth
parameters that is comparable in size to the observational uncertainties given
by multi-year datasets. Bias in the frequency parameter gives much less cause
for worry, being over an order of magnitude smaller than the corresponding
frequency uncertainties. The distortion discussed in this paper may need to be
considered when multi-year Sun-like asteroseismic datasets are analyzed on
stars showing strong activity cycles.


title:
Uniqueness, intractability and exact algorithms: reflections on level-k
  phylogenetic networks

abstract:
  Phylogenetic networks provide a way to describe and visualize evolutionary
histories that have undergone so-called reticulate evolutionary events such as
recombination, hybridization or horizontal gene transfer. The level k of a
network determines how non-treelike the evolution can be, with level-0 networks
being trees. We study the problem of constructing level-k phylogenetic networks
from triplets, i.e. phylogenetic trees for three leaves (taxa). We give, for
each k, a level-k network that is uniquely defined by its triplets. We
demonstrate the applicability of this result by using it to prove that (1) for
all k of at least one it is NP-hard to construct a level-k network consistent
with all input triplets, and (2) for all k it is NP-hard to construct a level-k
network consistent with a maximum number of input triplets, even when the input
is dense. As a response to this intractability we give an exact algorithm for
constructing level-1 networks consistent with a maximum number of input
triplets.


title: Radiative Neutrino Mass, Dark Matter and Leptogenesis

abstract:
  We propose an extension of the standard model, in which neutrinos are Dirac
particles and their tiny masses originate from a one-loop radiative diagram.
The new fields required by the neutrino mass-generation also accommodate the
explanation for the matter-antimatter asymmetry and dark matter in the
universe.


title:
The vanishing limit of the square-well fluid: the adhesive hard sphere
  model as a reference system

abstract:
  We report a simulation study of the gas-liquid critical point for the
square-well potential, for values of well width delta as small as 0.005 times
the particle diameter sigma. For small delta, the reduced second virial
coefficient at the critical point B_2*c is found to depend linearly on delta.
The observed weak linear dependence is not sufficient to produce any
significant observable effect if the critical temperature T_c is estimated via
a constant B_2*c assumption, due to the highly non linear transformation
between B_2*c and T_c. This explains the previously observed validity of the
law of corresponding states. The critical density rho_c is also found to be
constant when measured in units of the cubed average distance between two
bonded particles (1+0.5 delta)/sigma. The possibility of describing the delta
-> 0 dependence with precise functional forms provides improved acccurate
estimates of the critical parameters of the adhesive hard-sphere AHS model.


title:
Fidelity of optimally controlled quantum gates with randomly coupled
  multiparticle environments

abstract:
  This work studies the feasibility of optimal control of high-fidelity quantum
gates in a model of interacting two-level particles. One particle (the qubit)
serves as the quantum information processor, whose evolution is controlled by a
time-dependent external field. The other particles are not directly controlled
and serve as an effective environment, coupling to which is the source of
decoherence. The control objective is to generate target one-qubit gates in the
presence of strong environmentally-induced decoherence and under physically
motivated restrictions on the control field. It is found that interactions
among the environmental particles have a negligible effect on the gate fidelity
and require no additional adjustment of the control field. Another interesting
result is that optimally controlled quantum gates are remarkably robust to
random variations in qubit-environment and inter-environment coupling
strengths. These findings demonstrate the utility of optimal control for
management of quantum-information systems in a very precise and specific
manner, especially when the dynamics complexity is exacerbated by inherently
uncertain environmental coupling.


title:
A new effective interaction for $0\hbar\omega$ shell model calculations
  in the sdpf valence space

abstract:
  The neutron rich isotopes with Z<20, in particular those with neutron numbers
around N=28,have been at the focus of a lot experimental and theoretical
scrutiny during the last few years.Shell model calculations using the effective
interaction SDPF-NR, were able to predictor to explain most of the properties
featured by these nuclei. Prominent among them is the disappearance of the N=28
shell closure for Z<=16. We have incorporated to SDPF-NR some modifications,
either on purely theoretical grounds or guided by new experimental information.
The proposed interaction, SDPF-U, contains USD as its sd-shell part and KB3G as
its pf-shell-part. Its range of applicability is enlarged and its reliability
enhanced with respect to the earlier version.


title: Spectropolarimetry of a decaying sunspot penumbra

abstract:
  We report on high angular resolution, high precision spectropolarimetric
measurements of a decaying sunspot. The spot gradually lost its penumbra during
the course of three days. In the late stages of evolution where the only
remnant of the spot is a naked umbra, we find small-scale inhomogeneities in
the magnetic canopy surrounding it. The inhomogeneities are observed as
finger-like structures of weak and nearly horizontal magnetic fields extending
1-2 arcsec from the outer border of the umbra. These fields are not associated
with filamentary structures in continuum intensity, nor with conspicuous
Evershed flows. The Stokes profiles emerging from the fingers exhibit
blueshifts which we interpret as upward motions. This previously unknown fine
structure may be related to penumbral field lines that no longer carry strong
Evershed flows and rise to the chromosphere, producing the disappearance of the
penumbra at photospheric levels.


title:
Charged lepton and down-type quark masses in SU(1,1) model and the
  structure of higgs sector

abstract:
  The simplest noncompact group SU(1,1),when introduced as a symmetry group of
the generations of quarks and leptons in the framework of a vector-like theory,
gives an excellent viewpoint on low energy physics. The minimal setup of the
scheme, however, gives phenomenologically unacceptable prediction on the Yukawa
coupling matrices. This suggests the higgs sector has richer structure than we
expect from the success of MSSM. The natural extension of the scheme, which has
doubled structure in the higgs sector, is formulated. The framework admits this
extension in a restrictive way. The possible patterns of Yukawa couplings are
classified and the expressions of the coupling matrices are presented.


title:
Experimental evidence for a two-gap structure of superconducting NbSe_2:
  a specific heat study in external magnetic fields

abstract:
  To resolve the discrepancies of the superconducting order parameter in
quasi-two-dimensional NbSe_2, comprehensive specific-heat measurements have
been carried out. By analyzing both the zero-field and mixed-state data with
magnetic fields perpendicular to and parallel to the c axis of the crystal and
using the two-gap model, we conclude that (1) more than one energy scale of the
order parameter is required for superconducting NbSe_2 due to the thermodynamic
consistency; (2)delta_L=1.26 meV and delta_S=0.73 meV are obtained; (3)
N_S(0)/N(0)=11%~20%; (4) The observation of the kink in gamma(H) curve suggests
that the two-gap scenario is more favorable than the anisotropic s-wave model
to describe the gap structure of NbSe_2; and (5)delta_S is more isotropic and
has a three-dimensional-like feature and is located either on the Se or the
bonding Nb Fermi sheets.


title: Stein's method on Wiener chaos

abstract:
  We combine Malliavin calculus with Stein's method, in order to derive
explicit bounds in the Gaussian and Gamma approximations of random variables in
a fixed Wiener chaos of a general Gaussian process. We also prove results
concerning random variables admitting a possibly infinite Wiener chaotic
decomposition. Our approach generalizes, refines and unifies the central and
non-central limit theorems for multiple Wiener-It\^o integrals recently proved
(in several papers, from 2005 to 2007) by Nourdin, Nualart, Ortiz-Latorre,
Peccati and Tudor. We apply our techniques to prove Berry-Ess\'een bounds in
the Breuer-Major CLT for subordinated functionals of fractional Brownian
motion. By using the well-known Mehler's formula for Ornstein-Uhlenbeck
semigroups, we also recover a technical result recently proved by Chatterjee,
concerning the Gaussian approximation of functionals of finite-dimensional
Gaussian vectors.


title:
Critical behavior of interacting two-polymer system in a fractal
  solvent: an exact renormalization group approach

abstract:
  We study the polymer system consisting of two polymer chains situated in a
fractal container that belongs to the three--dimensional Sierpinski Gasket (3D
SG) family of fractals. Each 3D SG fractal has four fractal impenetrable 2D
surfaces, which are, in fact, 2D SG fractals. The two-polymer system is
modelled by two interacting self-avoiding walks (SAWs), one of them
representing a 3D floating polymer, while the other corresponds to a chain
adhered to one of the four 2D SG boundaries. We assume that the studied system
is immersed in a poor solvent inducing the intra-chain interactions. For the
inter-chain interactions we propose two models: in the first model (ASAWs) the
SAW chains are mutually avoiding, whereas in the second model (CSAWs) chains
can cross each other. By applying an exact Renormalization Group (RG) method,
we establish the relevant phase diagrams for $b=2,3$ and $b=4$ members of the
3D SG fractal family for the model with avoiding SAWs, and for $b=2$ and $b=3$
fractals for the model with crossing SAWs. Also, at the appropriate transition
fixed points we calculate the contact critical exponents, associated with the
number of contacts between monomers of different chains. Throughout the paper
we compare results obtained for the two models and discuss the impact of the
topology of the underlying lattices on emerging phase diagrams.


title: On A two-variable p-adic l_q function

abstract:
  We prove that a two-variable p-adic l_q-function has the series p-adic
expansion which interpolates a linear combinations of terms of the generalized
q-Euler polynomials at non positive integers. The proof of this original
construction is due to Kubota and Leopoldt in 1964, although the method given
this note is due to Washington


title: Software (Re-)Engineering with PSF

abstract:
  This paper investigates the usefulness of PSF in software engineering and
reengineering. PSF is based on ACP (Algebra of Communicating Processes) and as
some architectural description languages are based on process algebra, we
investigate whether PSF can be used at the software architecture level, but we
also use PSF at lower abstract levels. As a case study we reengineer the
compiler from the Toolkit of PSF.


title:
The evolution of H{\sc ii} galaxies: Testing the bursting scenario
  through the use of self-consistent models

abstract:
  We have computed a series of realistic and self-consistent models of the
emitted spectra of H{\sc ii} galaxies. Our models combine different codes of
chemical evolution, evolutionary population synthesis and photoionization. The
emitted spectrum of H{\sc ii} galaxies is reproduced by means of the
photoionization code CLOUDY, using as ionizing spectrum the spectral energy
distribution of the modelled H{\sc ii} galaxy, which in turn is calculated
according to a Star Formation History (SFH) and a metallicity evolution given
by a chemical evolution model that follows the abundances of 15 different
elements. The contribution of emission lines to the broad-band colours is
explicitly taken into account.
  The results of our code are compared with photometric and spectroscopic data
of H{\sc ii} galaxies. Our technique reproduces observed diagnostic diagrams,
abundances, equivalent width-colour and equivalent width-metallicity relations
for local H{\sc ii} galaxies.


title:
Giant vortex and Skyrmion in a rotating two-species Bose-Einstein
  condensate

abstract:
  Numerical simulations are performed for a rotating two-species Bose
condensate confined by a harmonic potential. The particle numbers of each
species are unequal. When the rotational speed exceeds a critical value, the
majority species reside in the center of the potential while the minority
species is pushed out to the outskirts, forming a giant vortex hole to contain
the majority species. A novel annular Skyrmion forms at the interface of the
two species.


title: $\R$-trees, dual laminations, and compact systems of partial isometries

abstract:
  Let $\FN$ be a free group of finite rank $N \geq 2$, and let $T$ be an
$\R$-tree with a very small, minimal action of $\FN$ with dense orbits. For any
basis $\CA$ of $\FN$ there exists a {\em heart} $K_{\CA} \subset \bar T$ (= the
metric completion of $T$) which is a compact subtree that has the property that
the dynamical system of partial isometries $a_{i} : K_{\CA} \cap a_{i} K_{\CA}
\to a_{i}\inv K_{\CA} \cap K_{\CA}$, for each $a_{i} \in \CA$, defines a tree
$T_{(K_{\CA}, \CA)}$ which contains an isometric copy of $T$ as minimal
subtree.


title:
Stability in the instantaneous Bethe-Salpeter formalism: reduced
  exact-propagator bound-state equation with harmonic interaction

abstract:
  Several numerical investigations of the Salpeter equation with static
confining interactions of Lorentz-scalar type revealed that its solutions are
plagued by instabilities of presumably Klein-paradox nature. By proving
rigorously that the energies of all predicted bound states are part of real,
entirely discrete spectra bounded from below, these instabilities are shown,
for confining interactions of harmonic-oscillator shape, to be absent for a
reduced version of an instantaneous Bethe-Salpeter formalism designed to
generalize the Salpeter equation towards an approximate inclusion of the exact
propagators of all bound-state constituents.


title: Finite unions of balls in C^n are rationally convex

abstract:
  It is shown that the rational convexity of any finite union of disjoint
closed balls in C^n follows easily from the results of Duval and Sibony.


title:
First Stars XI. Chemical composition of the extremely metal-poor dwarfs
  in the binary CS 22876--032

abstract:
  We have used high-resolution, high-S/N ratio spectra from the UVES
spectrograph at the ESO VLT telescope. Long-term radial-velocity measurements
and broad-band photometry allow us to determine improved orbital elements and
stellar parameters for both components. We use OSMARCS 1D models and the
{{\scshape turbospectrum}} spectral synthesis code to determine the abundances
of Li, O, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Fe, Co and Ni. We also use the
CO$^5$BOLD model atmosphere code to compute the 3D abundance corrections,
especially for Li and O. We find a metallicity of [Fe/H]$\sim -3.6$ for both
stars, using 1D models with 3D corrections of $\sim -0.1$ dex from averaged 3D
models. We determine the oxygen abundance from the near-UV OH bands; the 3D
corrections are large, -1 and -1.5 dex for the secondary and primary
respectively, and yield [O/Fe] $\sim 0.8$, close to the high-quality results
obtained from the [OI] 630 nm line in metal-poor giants. Other [$\alpha$/Fe]
ratios are consistent with those measured in other dwarfs and giants with
similar [Fe/H], although Ca and Si are somewhat low ([X/Fe]$\la 0$). Other
element ratios follow those of other halo stars. The Li abundance of the
primary star is consistent with the Spite plateau, but the secondary shows a
lower abundance; 3D corrections are small. The Li abundance in the primary star
supports the extension of the {{\em Spite Plateau}} value at the lowest
metallicities, without any decrease. The low abundance in the secondary star
could be explained by endogenic Li depletion, due to its cooler temperature. If
this is not the case, another, yet unknown mechanism may be causing increased
scatter in A(Li) at the lowest metallicities.


title: Delay Induced Instabilities in Self-Propelling Swarms

abstract:
  We consider a general model of self-propelling particles interacting through
a pairwise attractive force in the presence of noise and communication time
delay. Previous work by Erdmann, et al. [Phys. Rev. E {\bf 71}, 051904 (2205)]
has shown that a large enough noise intensity will cause a translating swarm of
individuals to transition to a rotating swarm with a stationary center of mass.
We show that with the addition of a time delay, the model possesses a
transition that depends on the size of the coupling amplitude. This transition
is independent of the initial swarm state (traveling or rotating) and is
characterized by the alignment of all of the individuals along with a swarm
oscillation. By considering the mean field equations without noise, we show
that the time delay induced transition is associated with a Hopf bifurcation.
The analytical result yields good agreement with numerical computations of the
value of the coupling parameter at the Hopf point.


title: Discrete chaotic states of a Bose-Einstein condensate

abstract:
  We find the different spatial chaos in a one-dimensional attractive
Bose-Einstein condensate interacting with a Gaussian-like laser barrier and
perturbed by a weak optical lattice. For the low laser barrier the chaotic
regions of parameters are demonstrated and the chaotic and regular states are
illustrated numerically. In the high barrier case, the bounded perturbed
solutions which describe a set of discrete chaotic states are constructed for
the discrete barrier heights and magic numbers of condensed atoms. The chaotic
density profiles are exhibited numerically for the lowest quantum number, and
the analytically bounded but numerically unbounded Gaussian-like configurations
are confirmed. It is shown that the chaotic wave packets can be controlled
experimentally by adjusting the laser barrier potential.


title: Partial Conway and iteration semirings

abstract:
  A Conway semiring is a semiring $S$ equipped with a unary operation $^*:S \to
S$, always called 'star', satisfying the sum star and product star identities.
It is known that these identities imply a Kleene type theorem. Some
computationally important semirings, such as $N$ or $N^{\rat}\llangle \Sigma^*
\rrangle$ of rational power series of words on $\Sigma$ with coefficients in
$N$, cannot have a total star operation satisfying the Conway identities. We
introduce here partial Conway semirings, which are semirings $S$ which have a
star operation defined only on an ideal of $S$; when the arguments are
appropriate, the operation satisfies the above identities. We develop the
general theory of partial Conway semirings and prove a Kleene theorem for this
generalization.


title: Hadronic-loop induced mass shifts in scalar heavy-light mesons

abstract:
  We calculate the mass shifts of heavy-light scalar mesons due to hadronic
loops under the assumption that these vanish for the groundstate heavy-light
mesons. The results show that the masses calculated in quark models can be
reduced significantly. We stress that the mass alone is not a signal for a
molecular interpretation. Both the resulting mass and the width suggest the
observed $D_0^*$ state could be a dressed $c\bar q$ state. We give further
predictions for the bottom scalar mesons which can be used to test the dressing
mechanism.


title:
Study of the exclusive $b \to u \ell^- \bar{\nu}_{\ell}$ decays in the
  MSSM with and without R-parity violation

abstract:
  We study the exclusive $b \to u \ell^- \bar{\nu}_{\ell} (\ell=\tau,\mu,e)$
decays in the MSSM with and without R-parity violation. From the experimental
measurements of branching ratios $\mathcal{B}(B^-_u \to \tau^-
\bar{\nu}_{\tau})$, $\mathcal{B}(B^-_u \to M'^0 \ell'^- \bar{\nu}_{\ell'})$ and
$\mathcal{B}(\bar{B}^0_d \to M'^+ \ell'^- \bar{\nu}_{\ell'})$ $(\ell'=\mu,e,
M'=\pi,\rho)$, we derive new upper bounds on the relevant new physics
parameters within the decays. Using the constrained new physics parameter
spaces, we predict the charged Higgs effects and the R-parity violating effects
on the branching ratios, the normalized forward-backward asymmetries of charged
leptons, and the ratios of longitudinal to transverse polarization of the
vector mesons, which have not been measured or have not been well measured yet.
We find that the charged Higgs effects and the R-parity violating effects could
be large and measurable in some cases. Our results could be used to probe new
physics effects in the leptonic decays as well as the semileptonic decays, and
will correlate with searches for direct supersymmetric signals in future
experiments.


title: Pressure effects on the superconducting transition in nH-CaAlSi

abstract:
  We present a combined experimental and theoretical study of the effects of
pressure on T_c of the hexagonal layered superconductors nH-CaAlSi (n = 1, 5,
6), where nH labels the different stacking variants that were recently
discovered. Experimentally, the pressure dependence of T_c has been
investigated by measuring the magnetic susceptibility of single crystals up to
10 kbar. In contrast to previous results on polycrystalline samples, single
crystals with different stacking sequences display different pressure
dependences of T_c. 1H-CaAlSi shows a decrease of T_c with pressure, whereas 5H
and 6H-CaAlSi exhibit an increase of T_c with pressure. Ab-initio calculations
for 1H, 5H and 6H -CaAlSi reveal that an ultrasoft phonon branch associated to
out-of-plane vibrations of the Al-Si layers softens with pressure, leading to a
structural instability at high pressures. For 1H-CaAlSi the softening is not
sufficient to cause an increase of T_c, which is consistent with the present
experiments, but adverse to previous reports. For 5H and 6H the softening
provides the mechanism to understand the observed increase of T_c with
pressure. Calculations for hypothetical 2H and 3H stacking variants reveal
qualitative and quantitative differences.


title:
Twin stimulated amplification of light and matter waves in an
  atom-photon pair laser

abstract:
  We consider ultracold atoms in a far detuned optical lattice orientated
across a high-Q optical resonator. Applying an external driving laser to the
atoms, which is red detuned from the cavity mode by one vibrational quantum,
induces cavity-enhanced sideband cooling. For a dense and cold enough atomic
ensemble we predict an oscillation threshold for optical Raman sideband lasing
concurrent with coherent matter-wave amplification. Above this oscillation
threshold photons and atoms in the lowest band are dominantly created pairwise
via stimulated emission with a strong suppression of competing spontaneous
processes. In close analogy to a nondegenerate parametric oscillator we find
sub-Poissonian photon statistics and almost perfect nonclassical atom-photon
number correlations. Injecting atoms in higher vibrational bands via tunneling
or incoherent scattering then leads to continuous, simultaneous generation of a
coherent atom beam and laser light with nonclassical atom-field correlations.


title: Heisenberg Algebra, Umbral Calculus and Orthogonal Polynomials

abstract:
  Umbral calculus can be viewed as an abstract theory of the Heisenberg
commutation relation $[\hat P,\hat M]=1$. In ordinary quantum mechanics $\hat
P$ is the derivative and $\hat M$ the coordinate operator. Here we shall
realize $\hat P$ as a second order differential operator and $\hat M$ as a
first order integral one. We show that this makes it possible to solve large
classes of differential and integro-differential equations and to introduce new
classes of orthogonal polynomials, related to Laguerre polynomials. These
polynomials are particularly well suited for describing so called flatenned
beams in laser theory


title: Power-Aware Real-Time Scheduling upon Identical Multiprocessor Platforms

abstract:
  In this paper, we address the power-aware scheduling of sporadic
constrained-deadline hard real-time tasks using dynamic voltage scaling upon
multiprocessor platforms. We propose two distinct algorithms. Our first
algorithm is an off-line speed determination mechanism which provides an
identical speed for each processor. That speed guarantees that all deadlines
are met if the jobs are scheduled using EDF. The second algorithm is an on-line
and adaptive speed adjustment mechanism which reduces the energy consumption
while the system is running.


title: Joint Source-Channel Coding Revisited: Information-Spectrum Approach

abstract:
  Given a general source with countably infinite source alphabet and a general
channel with arbitrary abstract channel input/channel output alphabets, we
study the joint source-channel coding problem from the information-spectrum
point of view. First, we generalize Feinstein's lemma (direct part) and
Verdu-Han's lemma (converse part) so as to be applicable to the general joint
source-channel coding problem. Based on these lemmas, we establish a sufficient
condition as well as a necessary condition for the source to be reliably
transmissible over the channel with asymptotically vanishing probability of
error. It is shown that our sufficient condition is equivalent to the
sufficient condition derived by Vembu, Verdu and Steinberg, whereas our
necessary condition is shown to be stronger than or equivalent to the necessary
condition derived by them. It turns out, as a direct consequence, that
separation principle in a relevantly generalized sense holds for a wide class
of sources and channels, as was shown in a quite dfifferent manner by Vembu,
Verdu and Steinberg. It should also be remarked that a nice duality is found
between our necessary and sufficient conditions, whereas we cannot fully enjoy
such a duality between the necessary condition and the sufficient condition by
Vembu, Verdu and Steinberg. In addition, we demonstrate a sufficient condition
as well as a necessary condition for the epsilon-transmissibility. Finally, the
separation theorem of the traditional standard form is shown to hold for the
class of sources and channels that satisfy the semi-strong converse property.


title: Event-Driven Simulation of the Dynamics of Hard Ellipsoids

abstract:
  We introduce a novel algorithm to perform event-driven simulations of hard
rigid bodies of arbitrary shape, that relies on the evaluation of the geometric
distance. In the case of a monodisperse system of uniaxial hard ellipsoids,we
perform molecular dynamics simulations varying the aspect-ratio X0 and the
packing fraction phi. We evaluate the translational Dtrans and the rotational
Drot diffusion coefficient and the associated isodiffusivity lines in the
phi-X0 plane. We observe a decoupling of the translational and rotational
dynamics which generates an almost perpendicular crossing of the Dtrans and
Drot isodiffusivity lines. While the self intermediate scattering function
exhibits stretched relaxation, i.e. glassy dynamics, only for large phi and X0
about equals to 1, the second order orientational correlator C2(t) shows
stretching only for large and small X0 values. We discuss these findings in the
context of a possible pre-nematic order driven glass transition.


title:
The frequency distribution of the height above the Galactic plane for
  the novae

abstract:
  In order to examine the hypothesis of the existence of two different kinds of
nova populations in the Galaxy - 'disk' novae and 'bulge' novae - the frequency
distribution in the z-direction was obtained for 64 novae. The fact that large
number of fast novae related to disk novae are found at a significant distance
from the Galactic plane (up to z~3700 pc) can't result from photometric
measurements errors. Slow novae considered to belong to bulge novae show more
close concentration to the Galactic plane (z<1700 pc). A Kolmogorov-Smirnov
test run on the data showed that the two populations hypothesis probability
amounts to 95.56%.


title:
The first Hochschild cohomology group of a schurian cluster-tilted
  algebra

abstract:
  Given a cluster-tilted algebra B we study its first Hochschild cohomology
group HH^1(B) with coefficients in the B-B-bimodule B. We find several
consequences when B is representation-finite, and also in the case where B is
cluster-tilted of type \tilde{\mathbb{A}}.


title:
Algebraic Characterization of CNOT-Based Quantum Circuits with its
  Applications on Logic Synthesis

abstract:
  The exponential speed up of quantum algorithms and the fundamental limits of
current CMOS process for future design technology have directed attentions
toward quantum circuits. In this paper, the matrix specification of a broad
category of quantum circuits, i.e. CNOT-based circuits, are investigated. We
prove that the matrix elements of CNOT-based circuits can only be zeros or
ones. In addition, the columns or rows of such a matrix have exactly one
element with the value of 1. Furthermore, we show that these specifications can
be used to synthesize CNOT-based quantum circuits. In other words, a new scheme
is introduced to convert the matrix representation into its SOP equivalent
using a novel quantum-based Karnaugh map extension. We then apply a
search-based method to transform the obtained SOP into a CNOT-based circuit.
Experimental results prove the correctness of the proposed concept.


title: Gamma-Ray Emission from PWNe Interacting with Molecular Clouds

abstract:
  We consider a situation in which a pulsar is formed inside or close to a high
density region of a molecular cloud. Right after birth, the pulsar was very
active and accelerated hadrons and leptons to very high energies. Hadrons
diffuse through the supernova remnant (SNR) and some of them are trapped in the
nearby cloud interacting with the matter. We extend a recent time-dependent
model for the gamma-radiation of pulsar wind nebulae (PWNe) to describe this
more complicated astrophysical scenario. The example calculations have been
performed for two objects, IC443 and W41, which have recently been discovered
as sources of TeV gamma-rays. In this model the low energy TeV emission should
be correlated with the birth place of the pulsar and the region of dense soft
radiation rather than with its present position, provided that the injection
rate of relativistic particles into the PWNa has been much more efficient at
early times. The high energy TeV emission should be correlated with the
location of dense clouds which were able to capture high energy hadrons due to
their strong magnetic fields.


title:
General Features of Supersymmetric Signals at the ILC: Solving the LHC
  Inverse Problem

abstract:
  We present the first detailed, large-scale study of the Minimal
Supersymmetric Standard Model (MSSM) at a $\sqrt s=500$ GeV International
Linear Collider, including full Standard Model backgrounds and detector
simulation. We investigate 242 points in the MSSM parameter space, which we
term models, that have been shown by Arkani-Hamed et al to be difficult to
study at the LHC. In fact, these points in MSSM parameter space correspond to
162 pairs of models which give indistinguishable signatures at the LHC, giving
rise to the so-called LHC Inverse Problem. We first determine whether the
production of the various SUSY particles is visible above the Standard Model
background for each of these parameter space points, and then make a detailed
comparison of their various signatures. Assuming an integrated luminosity of
500 fb$^{-1}$, we find that only 82 out of 242 models lead to visible
signatures of some kind with a significance $\geq 5$ and that only 57(63) out
of the 162 model pairs are distinguishable at $5(3)\sigma$. Our analysis
includes PYTHIA and CompHEP SUSY signal generation, full matrix element SM
backgrounds for all $2\to 2, 2\to 4$, and $2\to 6$ processes, ISR and
beamstrahlung generated via WHIZARD/GuineaPig, and employs the fast SiD
detector simulation org.lcsim.


title: Merging parton showers and matrix elements -- back to basics

abstract:
  We make a thorough comparison between different schemes of merging
fixed-order tree-level matrix element generators with parton-shower models. We
use the most basic benchmark of the O(alpha_S) correction to e+e- -> jets,
where the simple kinematics allows us to study in detail the transition between
the matrix-element and parton-shower regions. We find that the CKKW-based
schemes give a reasonably smooth transition between these regions, although
problems may occur if the parton shower used is not ordered in transverse
momentum. However, the so-called Pseudo-Shower and MLM schemes turn out to have
potentially serious problems due to different scale definitions in different
regions of phase space, and due to sensitivity to the details in the initial
conditions of the parton shower programs used.


title: Magnetic interference pattern in planar SNS Josephson junctions

abstract:
  We study the Josephson current through a ballistic normal metal layer of
thickness $D$ on which two superconducting electrodes are deposited within a
distance $L$ of each other. In the presence of an ({\it in-layer}) magnetic
field we find that the oscillations of the critical current $I_c(\Phi)$ with
the magnetic flux $\Phi$ are significantly different from an ordinary magnetic
interference pattern. Depending on the ratio $L/D$ and temperature,
$I_c(\Phi)$-oscillations can have a period smaller than flux quantum $\Phi_0$,
nonzero minima and damping rate much smaller than $1/\Phi$. Similar anomalous
magnetic interference pattern was recently observed experimentally.


title: Constraints on the variability of quark masses from nuclear binding

abstract:
  Based on recent work on nuclear binding, we update and extend the anthropic
constraints on the light quark masses, with results that are more tightly
constrained than previously obtained. We find that heavy nuclei would fall
apart (because the attractive nuclear central potential becomes too weak) if
the sum of the light quark masses m_u+m_d would exceed their physical values by
64% (at 95% confidence level). We summarize the anthropic constraints that
follow from requiring the existence both of heavy atoms and of hydrogen. With
the additional assumption that the quark Yukawa couplings do not vary, these
constraints provide a remarkably tight anthropic window for the Higgs vacuum
expectation value: 0.39 < v/v_physical < 1.64.


title: New results for 5-point functions

abstract:
  Bhabha scattering is one of the processes at the ILC where high precision
data will be expected. The complete NNLO corrections include radiative loop
corrections, with contributions from Feynman diagrams with five external legs.
We take these diagrams as an example and discuss several features of the
evaluation of pentagon diagrams. The tensor functions are usually reduced to
simpler scalar functions. Here we study, as an alternative, the application of
Mellin-Barnes representations to 5-point functions. There is no evidence for an
improved numerical evaluation of their finite, physical parts. However, the
approach gives interesting insights into the treatment of the IR-singularities.


title: Rigid objects in higher cluster categories

abstract:
  We study maximal $m$-rigid objects in the $m$-cluster category $\mathcal
C_H^m$ associated with a finite dimensional hereditary algebra $H$ with $n$
nonisomorphic simple modules. We show that all maximal $m$-rigid objects in
these categories have exactly $n$ nonisomorphic indecomposable summands, and
that any almost complete $m$-rigid object in $\mathcal C_H^m$ has exactly $m+1$
nonisomorphic complements. We also show that the maximal $m$-rigid objects and
the $m$-cluster tilting objects in these categories coincide, and that the
class of finite dimensional algebras associated with maximal $m$-rigid objects
is closed under certain factor algebras.


title: CaII Infrared triplet line models in Classical T Tauri stars

abstract:
  We study the formation of the calcium II infrared triplet lines 8498\AA,
8542\AA and 8662\AA, in the accreting magnetospheric flows of Classical T Tauri
stars (CTTS), and present a grid of models for a large range of magnetospheric
conditions. We apply our models to the interpretation of multi epoch
observations of the CTTS DI Cep. We find that these lines form in the
magnetospheric infall and that the variability of the CaII triplet lines in DI
Cep can be explained in the context of changes in the mass accretion
rate/temperature of the accretion column gas.


title:
An asymptotic theorem for minimal surfaces and existence results for
  minimal graphs in $H^2 \times R$

abstract:
  In this paper we prove a general and sharp Asymptotic Theorem for minimal
surfaces in $H^2\times R$. As a consequence, we prove that there is no properly
immersed minimal surface whose asymptotic boundary $C$ is a Jordan curve
homologous to zero in the asymptotic boundary of $ H^2\times R,$ say
$\partial_\infty H^2\times R$, such that $C$ is contained in a slab between two
horizontal circles of $\partial_\infty H^2\times R$ with width equal to $\pi.$
  We construct minimal vertical graphs in $H^2\times R$ over certain unbounded
admissible domains taking certain prescribed finite boundary data and certain
prescribed asymptotic boundary data. Our admissible unbounded domains $\Om$ in
$H^2\times \{0\}$ are non necessarily convex and non necessarily bounded by
convex arcs; each component of its boundary is properly embedded with zero, one
or two points on its asymptotic boundary, satisfying a further geometric
condition.


title: Towards the undestanding of radial velocity pulsation in roAp stars

abstract:
  High-resolution spectroscopic time series of rapidly oscillating Ap stars
show evidence for a co-existence of standing and running waves in their
atmospheric layers. With the purpose of understanding these observations we
have carried out a theoretical analysis of the pulsations in the outermost
layers of these stars, starting from the simplest possible model that still
retains all important physical ingredients. In our analysis we considered an
isothermal atmosphere in a plane-parallel approximation. Moreover we assumed
that in the region considered the magnetic pressure is much larger than the gas
pressure and, consequently, that the magnetoacoustic wave has decoupled into
its acoustic and magnetic components. Using the analytical solutions for the
velocity components appropriate to this model we estimate the velocity
component parallel to the line of sight averaged over the visible stellar disk.
Fitting the latter to a function of the form Acos($\sigma$t+phase), with
$\sigma$ the dimensionless oscillation frequency and t the dimensionless time,
we derive the amplitude A and the phase for our model as function of height in
the atmosphere.


title:
On the rate of convergence and Berry-Esseen type theorems for a
  multivariate free central limit theorem

abstract:
  We address the question of a Berry Esseen type theorem for the speed of
convergence in a multivariate free central limit theorem. For this, we estimate
the difference between the operator-valued Cauchy transforms of the normalized
partial sums in an operator-valued free central limit theorem and the Cauchy
transform of the limiting operator-valued semicircular element.


title: X-ray properties of protostars in the Orion Nebula

abstract:
  The origin and evolution of the X-rays in very young stellar objects (YSOs)
are not yet well understood since it is very hard to observe YSOs in the
protostellar phase. We study the X-ray properties of Class 0-I objects in the
Orion Nebula Cluster (ONC) and compare them with those of the more evolved
Class II and III members. Using Chandra Orion Ultradeep Project (COUP) data, we
study the X-ray properties of stars in different evolutionary classes:
luminosities, NH, temperatures and time variability are compared in order to
understand if the interaction between the circumstellar material and the
central object can influence the X-ray emission. We have assembled the deepest
and most complete photometric catalog of objects in the ONC region from the UV
to 8 microns using data from HST, WFI@2.2m ESO and ISPI@4m CTIO telescopes, and
Spitzer IRAC. We select high probability candidate Class 0-I protostars,
distinguishing between those having a spectral energy distribution which rises
from K up to 8 microns (Class 0-Ia) from those where the SED rises from K up to
4.5 microns and decreasing afterwards (Class 0-Ib). We select a sample of bona
fide Class II stars and a set of Class III stars with IR emission consistent
with normal photospheres. Our principal result is that Class 0-Ia objects are
significantly less luminous in X-rays, both in the total and hard bands, than
the more evolved Class II stars with mass larger than 0.5 Msun; these latter
show X-ray luminosities similar to those of Class 0-Ib stars. This result
supports the hypothesis that the onset of X-ray emission occurs at a very early
stage of star formation. Temporal variability and spectral properties of Class
0-I stars are similar to those of the more evolved Class II and III objects,
except for a larger absorption likely due to gas in the circumstellar material.


title: Enriques and Octonionic Magic Supergravity Models

abstract:
  We reconsider the Enriques Calabi Yau (FHSV) model and its string derivation
and argue that the Octonionic magic supergravity theory admits a string
interpretation closely related to the Enriques model. The uplift to D=6 of the
Octonionic magic model has 16 abelian vectors related to the rank of Type I and
Heterotic strings.


title: Outflows and winds in AGNs: a case for Simbol-X

abstract:
  Chandra and XMM-Newton X-ray observations are accumulating evidence for
massive, high velocity outflows in Seyfert galaxies and quasars, most likely
originating very close to the central supermassive black hole. These results
are offering new potential to probe the launching regions of relativistic
jets/outflows, and to quantify their feedback impact on the host galaxy and/or
cluster of galaxies. The most important signature of these phenomena is the
detection of blueshifted absorption lines of highly ionized iron at energies
usually greater than ~7 keV. The lack of sensitivity of present day X-ray
observatories at these energies gives rise to bias against the detection of
more ``extreme'' outflows, with highest velocity and ionization, which would be
blueshifted at energies >10 keV. Thus, simulations with Simbol-X were carried
out to test its capability of detecting absorption lines/edges between 5-20
keV, in order to probe the dynamics (i.e. measurement of velocity variations)
of the absorbing gas, as well as the highest (up to relativistic speeds)
velocity and ionization components. We found that the unprecedented sensitivity
of Simbol-X between 5-30 keV is a great opportunity to obtain important
improvements in this research field.


title: On the physical nature of Anderson localization effect

abstract:
  An alternative explanation of the physical nature of Anderson localization
phenomenon and one of the most direct ways of its experimental study are
discussed.


title:
Radially-Inflowing Molecular Gas in NGC 1275 Deposited by a X-ray
  Cooling Flow in the Perseus Cluster

abstract:
  We have imaged in CO(2-1) the molecular gas in NGC 1275 (Perseus A), the cD
galaxy at the center of the Perseus Cluster, at a spatial resolution of $\sim$1
kpc over a central region of radius $\sim$ 10 kpc. Per A is known to contain
$\sim$1.3x10$^{10}$ M$_\odot$ of molecular gas, which has been proposed to be
captured from mergers with or ram-pressure stripping of gas-rich galaxies, or
accreted from a X-ray cooling flow. The molecular gas detected in our image has
a total mass of $\sim$4x10$^9$ M$_\odot$, and for the first time can be seen to
be concentrated in three radial filaments with lengths ranging from at least
1.1-2.4 kpc all lying in the east-west directions spanning the center of the
galaxy to radii of $\sim$8 kpc. The eastern and outer western filaments exhibit
larger blueshifted velocities with decreasing radii, whereas the inner western
filament spans the systemic velocity of the galaxy. The molecular gas shows no
signature of orbital motion, and is therefore unlikely to have been captured
from gas-rich galaxies. Instead, we are able to reproduce the observed
kinematics of the two outer filaments as free-fall in the gravitational
potential of Per A, as would be expected if they originate from a X-ray cooling
flow. Indeed, all three filaments lie between two prominent X-ray cavities
carved out by radio jets from Per A, and closely resembles the spatial
distribution of the coolest X-ray gas in the cluster core. The inferred
mass-deposition rate into the two outermost filaments alone is roughly 75
M$_odot$ yr$^{-1}$. This cooling flow can provide a nearly continuous supply of
molecular gas to fuel the active nucleus in Per A.


title:
Higher-order gravity and the cosmological background of gravitational
  waves

abstract:
  The cosmological background of gravitational waves can be tuned by the
higher-order corrections to the gravitational Lagrangian. In particular, it can
be shown that assuming $R^{1+\epsilon}$, where $\epsilon$ indicates a generic
(eventually small) correction to the Hilbert-Einstein action in the Ricci
scalar $R$, gives a parametric approach to control the evolution and the
production mechanism of gravitational waves in the early Universe.


title: Oncoprotein metastasis disjoined

abstract:
  As the past decade barely dawned, a fundamentally novel view of cancer
relating to signal transduction through intracellular hormones/growth factors
and their subunits began to unfold. Further along, it gained additional
substance with the advent of the interdisciplinary fields of particle biology
and peptide strings which explain (onco)protein dynamics in spacetime, for
instance insulin-driven sub- and trans-cellular carcinogenesis, by physical
principles. Here, this new understanding is expanded to introduce the concept
of "oncoprotein metastasis" preceding cancer cell spread and, thereby, a
particular emphasis is placed on its potential role in the emergence of the
pre-metastatic niche. Consistent with this perception, yet unlike currently
advocated treatments that target cancer cells only, future antineoplastic
strategies should aim to mimic natural tumor suppressors as well as involve
both (morphologically) normal and malignant cells. If validated in human
patients with advanced cancer disease, its otherwise frequently lethal course
may be halted and reversed just in time.


title:
Spectroscopy of electronic defect states in Cu(In, Ga)(S, Se)$_2$-based
  heterojunctions and Schottky diodes under damp-heat exposure

abstract:
  The changes of defect characteristics induced by accelerated lifetime tests
on the heterostructure n-ZnO/i-ZnO/CdS/Cu(In, Ga)(S, Se)$_2$/Mo relevant for
photovoltaic energy conversion are investigated. We subject heterojunction and
Schottky devices to extended damp heat exposure at 85$^{\circ}$C ambient
temperature and 85% relative humidity for various time periods. In order to
understand the origin of the pronounced changes of the devices, we apply
current--voltage and capacitance--voltage measurements, admittance
spectroscopy, and deep-level transient spectroscopy. The fill factor and
open-circuit voltage of test devices are reduced after prolonged damp heat
treatment, leading to a reduced energy conversion efficiency. We observe the
presence of defect states in the vicinity of the CdS/chalcopyrite interface.
Their activation energy increases due to damp heat exposure, indicating a
reduced band bending at the Cu(In, Ga)(S, Se)$_2$ surface. The Fermi-level
pinning at the buffer/chalcopyrite interface, maintaining a high band bending
in as-grown cells, is lifted due to the damp-heat exposure. We also observe
changes in the bulk defect spectra due to the damp-heat treatment.


title: Detection of sea-serpent field lines in sunspot penumbrae

abstract:
  We investigate the spatial distribution of magnetic polarities in the
penumbra of a spot observed very close to disk center. High-spatial resolution,
high-cadence magnetograms taken with the Narrowband Filter Imager aboard Hinode
are used in this study. They provide continuous and stable measurements in the
photospheric Fe I 630.25 line for long periods of time. We discover
small-scale, elongated, bipolar magnetic structures that appear in the mid
penumbra and move radially outward across the penumbra. They occur in between
the more vertical fields of the penumbra, and can be associated with the
horizontal fields that harbor the Evershed flow. Many of them cross the outer
penumbral boundary, becoming moving magnetic features in the sunspot moat. We
determine the properties of these structures, including their sizes, proper
motions, footpoint separation, and lifetimes. The bipolar patches can be
interpreted as being produced by sea-serpent field lines that originate in the
mid-penumbra and eventually leave the spot in the form moving magnetic
features. The existence of such field lines has been inferred from Stokes
inversions of spectropolarimetric measurements at lower angular resolution, but
this is the first time they are imaged directly. Our observations add another
piece of evidence in favor of the uncombed structure of penumbral magnetic
fields.


title: Conformal Curves on $WO_3$ Surface

abstract:
  We have studied the iso-height lines on the $\mathrm{WO_3}$ surface as a
physical candidate for conformally invariant curves. We have shown that these
lines are conformally invariant with the same statistics of domain walls in the
critical Ising model. They belong to the family of conformal invariant curves
called Schramm-Loewner evolution (or $SLE_{\kappa}$), with diffusivity of
$\kappa \sim 3$. This can be regarded as the first experimental observation of
SLE curves. We have also argued that Ballistic Deposition (BD) can serve as a
growth model giving rise to contours with similar statistics at large scales.


title: Laboratory soft x-ray emission due to the Hawking-Unruh effect?

abstract:
  The structure of spacetime, quantum field theory, and thermodynamics are all
connected through the concepts of the Hawking and Unruh temperatures. The
possible detection of the related radiation constitutes a fundamental test of
such subtle connections. Here a scheme is presented for the detection of Unruh
radiation based on currently available laser systems. By separating the
classical radiation from the Unruh-response in frequency space, it is found
that the detection of Unruh radiation is possible in terms of soft x-ray
photons using current laser-electron beam technology. The experimental
constraints are discussed and a proposal for an experimental design is given.


title:
Homogenization of reflected semilinear PDE with nonlinear Neumann
  boundary condition

abstract:
  We study the homogenization problem of semi linear reflected partial
differential equations (reflected PDEs for short) with nonlinear Neumann
conditions. The non-linear term is a function of the solution but not of its
gradient. The proof are fully probabilistic and uses weak convergence of
associated reflected generalized backward differential stochastic equations
(reflected GBSDEs in short).


title:
Inertial range scaling of scalar flux spectra in uniformly sheared
  turbulence

abstract:
  A model based on two-point closure theory of turbulence is proposed and
applied to study the Reynolds number dependency of the scalar flux spectra in
homogeneous shear flow with a cross-stream uniform scalar gradient. For the
cross-stream scalar flux, in the inertial range the spectral behavior agrees
with classical predictions and measurements. The streamwise scalar flux is
found to be in good agreement with the results of atmospheric measurements.
However, both the model results and the atmospheric measurements disagree with
classical predictions. A detailed analysis of the different terms in the
evolution equation for the streamwise scalar flux spectrum shows that nonlinear
contributions are governing the inertial subrange of this spectrum and that
these contributions are relatively more important than for the cross-stream
flux. A new expression for the scalar flux spectra is proposed. It allows us to
unify the description of the components in one single expression, leading to a
classical K^-7/3 inertial range for the cross-stream component and to a new
K^-23/9 scaling for the streamwise component that agrees better with
atmospheric measurements than the K^-3 prediction of J. C. Wyngaard and O. R.
Cot\'e [Quart. J. R. Met. Soc. 98, 590 (1972)].


title: The rotational evolution of young low mass stars

abstract:
  Star-disk interaction is thought to drive the angular momentum evolution of
young stars. In this review, I present the latest results obtained on the
rotational properties of low mass and very low mass pre-main sequence stars. I
discuss the evidence for extremely efficient angular momentum removal over the
first few Myr of pre-main sequence evolution and describe recent results that
support an accretion-driven braking mechanism. Angular momentum evolution
models are presented and their implication for accretion disk lifetimes
discussed.


title:
A way to get rid of cosmological constant and zero point energy problems
  of quantum fields through metric reversal symmetry

abstract:
  In this paper a framework is introduced to remove the huge discrepancy
between the empirical value of the cosmological constant and the contribution
to the cosmological constant predicted from the vacuum energy of quantum
fields. An extra dimensional space with metric reversal symmetry and $R^2$
gravity is considered to this end. The resulting 4-dimensional energy-momentum
tensor (obtained after integration over extra dimensions) consists of terms
that contain off-diagonally coupled pair of Kaluza-Klein modes. This, in turn,
generically results in vanishing of the vacuum expectation value of the
energy-momentum tensor for quantum fields, and offers a way to solve the
problem of huge contribution of quantum fields to the vacuum energy density.


title: Chiral effective field theory on the lattice at next-to-leading order

abstract:
  We study nucleon-nucleon scattering on the lattice at next-to-leading order
in chiral effective field theory. We determine phase shifts and mixing angles
from the properties of two-nucleon standing waves induced by a hard spherical
wall in the center-of-mass frame. At fixed lattice spacing we test model
independence of the low-energy effective theory by computing
next-to-leading-order corrections for two different leading-order lattice
actions. The first leading-order action includes instantaneous one-pion
exchange and same-site contact interactions. The second leading-order action
includes instantaneous one-pion exchange and Gaussian-smeared interactions. We
find that in each case the results at next-to-leading order are accurate up to
corrections expected at higher order.


title: Gravitational Waves From the End of Inflation: Computational Strategies

abstract:
  Parametric resonance or preheating is a plausible mechanism for bringing
about the transition between the inflationary phase and a hot, radiation
dominated universe. This epoch results in the rapid production of heavy
particles far from thermal equilibrium and could source a significant
stochastic background of gravitational radiation. Here, we present a numerical
algorithm for computing the contemporary power spectrum of gravity waves
generated in this post-inflationary phase transition for a large class of
scalar-field driven inflationary models. We explicitly calculate this spectrum
for both quartic and quadratic models of chaotic inflation, and low-scale
hybrid models. In particular, we consider hybrid models with an ``inverted''
potential. These models have a very short and intense period of resonance which
is qualitatively different from previous examples studied in this context, but
we find that they lead to a similar spectrum of gravitational radiation.


title:
A Proof Of Kochen - Specker Theorem of Quantum Mechanics Using a Quantum
  Like Algebraic Formulation

abstract:
  Using a quantum like algebraic formulation we give proof of Kochen-Specker
theorem. We introduce new criteria in order to account for the contextual
nature of measurements in quantum mechanics.


title:
Dilute neutron matter on the lattice at next-to-leading order in chiral
  effective field theory

abstract:
  We discuss lattice simulations of the ground state of dilute neutron matter
at next-to-leading order in chiral effective field theory. In a previous paper
the coefficients of the next-to-leading-order lattice action were determined by
matching nucleon-nucleon scattering data for momenta up to the pion mass. Here
the same lattice action is used to simulate the ground state of up to 12
neutrons in a periodic cube using Monte Carlo. We explore the density range
from 2% to 8% of normal nuclear density and analyze the ground state energy as
an expansion about the unitarity limit with corrections due to finite
scattering length, effective range, and P-wave interactions.


title: Decay of scalar variance in isotropic turbulence in a bounded domain

abstract:
  The decay of scalar variance in isotropic turbulence in a bounded domain is
investigated. Extending the study of Touil, Bertoglio and Shao (2002; Journal
of Turbulence, 03, 49) to the case of a passive scalar, the effect of the
finite size of the domain on the lengthscales of turbulent eddies and scalar
structures is studied by truncating the infrared range of the wavenumber
spectra. Analytical arguments based on a simple model for the spectral
distributions show that the decay exponent for the variance of scalar
fluctuations is proportional to the ratio of the Kolmogorov constant to the
Corrsin-Obukhov constant. This result is verified by closure calculations in
which the Corrsin-Obukhov constant is artificially varied. Large-eddy
simulations provide support to the results and give an estimation of the value
of the decay exponent and of the scalar to velocity time scale ratio.


title: Note sur la conjecture de Leopoldt

abstract:
  We prove that number fields with arbitrary degree but weak ramification
satisfy the Leopoldt conjecture on the l-adic rank of the group of units


title: A general Lagrange Theorem

abstract:
  The ordinary continued fractions expansion of a real number is based on the
Euclidean division. Variants of the latter yield variants of the former, all
encompassed by a more general Dynamical Systems framework. For all these
variants the Lagrange Theorem holds: a number has an eventually periodic
expansion if and only if it is a quadratic irrational. This fact is surely
known for specific expansions, but the only proof for the general case that I
could trace in the literature follows as an implicit corollary from much deeper
results by Boshernitzan and Carroll on interval exchange transformations. It
may then be useful to have at hand a simple and virtually computation-free
proof of a general Lagrange Theorem.


title: Plongements l-adiques et l-nombres de Weil

abstract:
  We define l-adic analogs of classical Weil numbers in connexion both with
complex or l-adic imbeddings of number fields and real or l-adic absolute
values. As an application we give some consequences related to the Iwasawa
theory of cyclotomic towers.


title: Compactification l-adique de R

abstract:
  We construct a compact topological group Rl which contains both the real
additive group R and the l-adic one Ql (for a given prime number l) as dense
subgroups; thus we study some of its properties. This construction gives an
arithmetic description of the so-called l-adic solenoid classically defined in
terms of foliations.


title:
Towards NNLO Accuracy in the QCD Sum Rule for the Kaon Distribution
  Amplitude

abstract:
  We calculate the $O(\alpha_s)$ and $O(\alpha_s^2)$ gluon radiative
corrections to the QCD sum rule for the first Gegenbauer moment $a_1^K$ of the
kaon light-cone distribution amplitude. The NNL0 accuracy is achieved for the
perturbative term and quark-condensate contributions to the sum rule. A
complete factorization is implemented, removing logarithms of $s$-quark mass
from the coefficients in the operator-product expansion. The sum rule with
radiative corrections yields $a_1^K(1 \GeV)=0.10\pm 0.04$.


title: Neutrino oscillation signatures of oxygen-neon-magnesium supernovae

abstract:
  We discuss the flavor conversion of neutrinos from core collapse supernovae
that have oxygen-neon-magnesium (ONeMg) cores. Using the numerically calculated
evolution of the star up to 650 ms post bounce, we find that, for the normal
mass hierarchy, the electron neutrino flux in a detector shows signatures of
two typical features of an ONeMg-core supernova: a sharp step in the density
profile at the base of the He shell and a faster shock wave propagation
compared to iron core supernovae. Before the shock hits the density step (t ~
150 ms), the survival probability of electron neutrinos is about 0.68, in
contrast to values of 0.32 or less for an iron core supernova. The passage of
the shock through the step and its subsequent propagation cause a decrease of
the survival probability and a decrease of the amplitude of oscillations in the
Earth, reflecting the transition to a more adiabatic propagation inside the
star. These changes affect the lower energy neutrinos first; they are faster
and more sizable for larger theta_13. They are unique of ONeMg-core supernovae,
and give the possibility to test the speed of the shock wave. The time
modulation of the Earth effect and its negative sign at the neutronization peak
are the most robust signatures in a detector.


title:
Onset of Deconfinement in Nucleus-Nucleus Collisions - Past, Present and
  Future -

abstract:
  In 2007 Mark I. Gorenstein celebrated his 60th birthday. This report is
dedicated to Mark and it sketches the results obtained during the past ten
years of our collaboration and friendship. They concern search for and study of
the onset of deconfinement in high energy nucleus-nucleus collisions.


title: Collisions of bright solitary matter waves

abstract:
  The collisions of three-dimensional bright solitary matter waves formed from
atomic Bose-Einstein condensates are shown to exhibit rich behaviour.
Collisions range from being elastic to completely destructive due to the onset
of collapse during the interaction. Through a detailed quantitative analysis we
map out the role of relative phase, impact speed and interaction strength. In
particular, we identify the importance of the collapse time in the onset of
unstable collisions and show how the relative phase controls a population
transfer between the waves. Our analysis enables us to interpret recent
experimental observations of bright solitary matter waves.


title:
Faithful Effective-One-Body waveforms of equal-mass coalescing
  black-hole binaries

abstract:
  We continue the program of constructing, within the Effective-One-Body (EOB)
approach, high-accuracy analytic waveforms describing the signal emitted by
inspiralling and coalescing black hole binaries. Here, we compare a recently
derived, resummed 3 PN-accurate EOB quadrupolar waveform to the results of a
numerical simulation of the inspiral and merger of an equal-mass black hole
binary. We find a remarkable agreement, both in phase and in amplitude, with a
maximal dephasing which can be reduced below $\pm 0.005$ gravitational-wave
(GW) cycles over 12 GW cycles corresponding to the end of the inspiral, the
plunge, the merger and the beginning of the ringdown. This level of agreement
is shown for two different values of the effective 4 PN parameter a_5, and for
corresponding, appropriately "flexed" values of the radiation-reaction
resummation parameter v_pole. In addition, our resummed EOB amplitude agrees to
better than the 1% level with the numerical-relativity one up to the late
inspiral. These results, together with other recent work on the
EOB-numerical-relativity comparison, confirm the ability of the EOB formalism
to faithfully capture the general relativistic waveforms.


title: The Optical-Radio Mapping: the kinetic efficiency of Radio-Loud AGNs

abstract:
  We constrain the mean kinetic efficiency of radio-loud active galactic nuclei
by using an optically selected sample for which both the optical and the radio
luminosity functions (LFs) have been determined; the former traces the
bolometric luminosity L, while the latter traces the kinetic power L_k,
empirically correlated to the radio emission. Thus in terms of the ratio
g_k=L_k/L, we can convert the optical LF of the sample into a radio one. This
computed LF is shown to match the directly observed LF for the same sample if
g_k=0.10^{+0.05}_{-0.01} holds, with a scatter \sigma=0.38^{+0.04}_{-0.09} dex;
with these values we also match a number of independent correlations between
L_k, L and radio emission, that we derive through Monte Carlo simulations. We
proceed to translate the value of g_k into a constraint on the kinetic
efficiency for the production of radio jets or winds, namely,
\epsilon_k=L_k/(Mdot*c^2)~0.01 in terms of the rate Mdot of mass accretion onto
the central black hole. Then, on assuming that on average the radio sources
share the same kinetic efficiency, we compute a solid lower limit of about 25%
on the contribution of radio sources to the local black hole mass density.


title:
X-ray and IR Point Source Identification and Characteristics in the
  Embedded, Massive Star-Forming Region RCW 108

abstract:
  We report on the results of an approximately 90 ks Chandra observation of a
complex region that hosts multiple sites of recent and active star formation in
ARA OB1a. The field is centered on the embedded cluster RCW 108-IR and includes
and a large portion of the open cluster NGC 6193. We detect over 420 X-ray
sources in the field and combined these data with deep near-IR, Spitzer/IRAC
and MSX mid-IR data. We find about 360 of the X-ray sources have near--IR
counterparts. We divide the region into 5 parts based on the X-ray point source
characteristics and extended 8 micron emission. The most clearly defined
regions are the central region - identified by embedded sources with high
luminosities in the both the near-IR and X-ray as well as high X-ray
temperatures (about 3 keV) and the eastern region - identified by low
extinction and 1 keV X-ray temperatures. Other regions, identified by their
directional relationship to RCW 108-IR are less uniform - representing
combinations of the first two regions, independent star formation epochs, or
both. Over 18% percent of the cluster members with over 100 counts exhibit
flares. Overall about 50% of the stars appear to have optically thick disks
when IRAC data are employed. The largest fraction of X-ray sources are best
described as possessing some disk material via a more detailed extinction
fitting. We estimate that the total number of pre--main sequence stars in the
field is about 1600. Approximately 800 are confined to (1.1 pc) central region.


title: Metallicity estimates of Galactic Cepheids based on Walraven photometry

abstract:
  We present new empirical and theoretical calibrations of two photometric
metallicity indices based on Walraven photometry. The empirical calibration
relies on a sample of 48 Cepheids for which iron abundances based on high
resolution spectra are available in the literature. They cover a broad range in
metal abundance (-0.5 < [Fe/H] < +0.5) and the intrinsic accuracy of the
Metallicity Index Color (MIC) relations is better than 0.2 dex. The theoretical
calibration relies on a homogeneous set of scaled-solar evolutionary tracks for
intermediate-mass stars and on pulsation predictions concerning the topology of
the instability strip. The metal content of the adopted evolutionary tracks
ranges from Z=0.001 to Z=0.03 and the intrinsic accuracy of the MIC relations
is better than 0.1 dex.


title: On tropical and Kapranov ranks of tropical matrices

abstract:
  We prove that, for any g greater or equal than 3, a matrix g x 5 with
tropical rank 3 has Kapranov rank 3.


title: Classical and Quantum Features of the Mixmaster Singularity

abstract:
  This review article is devoted to analyze the main properties characterizing
the cosmological singularity associated to the homogeneous and inhomogeneous
Mixmaster model. After the introduction of the main tools required to treat the
cosmological issue, we review in details the main results got along the last
forty years on the Mixmaster topic. We firstly assess the classical picture of
the homogeneous chaotic cosmologies and, after a presentation of the canonical
method for the quantization, we develop the quantum Mixmaster behavior.
Finally, we extend both the classical and quantum features to the fully
inhomogeneous case. Our survey analyzes the fundamental framework of the
Mixmaster picture and completes it by accounting for recent and peculiar
outstanding results.


title:
Logarithmically Enhanced Corrections to the Decay Rate and Forward
  Backward Asymmetry in anti-B --> X(s) l+ l-

abstract:
  We study logarithmically enhanced electromagnetic corrections to the decay
rate in the high dilepton invariant mass region as well as corrections to the
forward backward asymmetry (FBA) of the inclusive rare decay $\bar{B} \to X_s
\ell^+ \ell^-$. As expected, the relative effect of these corrections in the
high dilepton mass region is around -8% for the muonic final state and
therefore much larger than in the low dilepton mass region.
  We also present a complete phenomenological analysis, to improved NNLO
accuracy, of the dilepton mass spectrum and the FBA integrated in the low
dilepton mass region, including a new approach to the zero of the FBA. The
latter represents one of the most precise predictions in flavour physics with a
theoretical uncertainty of order 5%. We find $(q_0^2)_{\mu\mu} = (3.50 \pm
0.12) \gev^2$. For the high dilepton invariant mass region, we have ${\cal
B}(\bar B\to X_s\mu\mu)_{\rm high} = (2.40^{+0.69}_{-0.62}) \times 10^{-7}$.
The dominant uncertainty is due to the $1/m_b$ corrections and can be
significantly reduced in the future. For the low dilepton invariant mass
region, we confirm previous results up to small corrections.


title: Atomic Cascade in Muonic and Hadronic Hydrogen Atoms

abstract:
  The atomic cascade in $\mu^- p$ and $\pi^- p$ atoms has been studied with the
improved version of the extended cascade model in which new quantum mechanical
calculations of the differential and integral cross sections of the elastic
scattering, Stark transitions and Coulomb de-excitation have been included for
the principal quantum number values $n\le 8$ and the relative energies $E \ge
0.01$ eV. The $X$-ray yields and kinetic energy distributions are compared with
the experimental data.


title: Geometry in transition: A model of emergent geometry

abstract:
  We study a three matrix model with global SO(3) symmetry containing at most
quartic powers of the matrices. We find an exotic line of discontinuous
transitions with a jump in the entropy, characteristic of a 1st order
transition, yet with divergent critical fluctuations and a divergent specific
heat with critical exponent $\alpha=1/2$. The low temperature phase is a
geometrical one with gauge fields fluctuating on a round sphere. As the
temperature increased the sphere evaporates in a transition to a pure matrix
phase with no background geometrical structure. Both the geometry and gauge
fields are determined dynamically. It is not difficult to invent higher
dimensional models with essentially similar phenomenology. The model presents
an appealing picture of a geometrical phase emerging as the system cools and
suggests a scenario for the emergence of geometry in the early universe.


title: OGLE-II High Proper Motion Stars towards the Galactic centre

abstract:
  The photometry data base of the second phase of the OGLE microlensing
experiment, OGLE-II, is a rich source of information about the kinematics and
structure of the Galaxy. In this work we use the OGLE-II proper motion
catalogue to identify candidate stars which have high proper motions. 521 stars
with proper motion mu > 50 mas/yr in the OGLE-II proper motion catalogue (Sumi
2004) were cross-identified with stars in the MACHO high proper motion
catalogue, and the DENIS and 2MASS infra-red photometry catalogues. Photometric
distances were computed for stars with colours consistent with G/K and M type
stars. 6 stars were newly identified as possible nearby (< 50 pc) M dwarfs.


title: Recent Developments in Chiral Unitary Dynamics of Resonances

abstract:
  In this talk I summarize recent findings made on the description of axial
vector mesons as dynamically generated states from the interaction of
peseudoscalar mesons and vector mesons, dedicating some attention to the two
$K_1(1270)$ states. Then I review the generation of open and hidden charm
scalar and axial states. Finally, I present recent results showing that the low
lying $1/2^+$ baryon resonances for S=-1 can be obtained as bound states or
resonances of two mesons and one baryon in coupled channels dynamics.


title: Non-perturbative QCD effects in jets at hadron colliders

abstract:
  We discuss non-perturbative QCD contributions to jet observables, computing
their dependence on the jet radius R, and on the colour and transverse momentum
of the parton initiating the jet. We show, using analytic QCD models of power
corrections as well as Monte Carlo simulations, that hadronisation corrections
grow at small values of R, behaving as 1/R, while underlying event
contributions grow with the jet area as R^2. We highlight the connection
between hadronisation corrections to jets and those for event shapes in e^+e^-
and DIS; we note the limited dependence of our results on the choice of jet
algorithm; finally, we propose several measurements in the context of which to
test or implement our predictions. The results presented here reinforce the
motivation for the use of a range of R values, as well as a plurality of
infrared-safe jet algorithms, in precision jet studies at hadron colliders.


title: A Spectral sequence for polynomially bounded cohomology

abstract:
  We construct an analogue of the Lyndon-Hochschild-Serre spectral sequence in
the context of polynomial cohomology, for group extensions. If G is an
extension of Q by H, then the spectral sequence converges to the polynomial
cohomology of G. For the polynomial extensions of Noskov with normal subgroup
isocohomological, the E_2 term is the polynomial cohomology of Q with
coefficients in the polynomial cohomology of H. When both Q and H are
isocohomological G must be as well. By referencing results of Connes-Moscovici
and Noskov, if Q and H are both isocohomological and have the Rapid Decay
property of Jolissaint, then G satisfies the Novikov Conjecture.


title:
Generation and detection of a spin entanglement in nonequilibrium
  quantum dots

abstract:
  Spin entanglement between two spatially separated electrons can be generated
in nonequilibrium interacting quantum dots, coherently coupled to a common
lead. In this system entangled two-electron states develop which are Werner
states with an imbalance between singlet and triplet probabilities. We propose
a multi-terminal, multiply-connected setup for the generation and detection of
this imbalance. In particular, we identify a regime in which the formation of
spin entanglement leads to a cancellation of Aharonov-Bohm oscillations.


title:
Physical and chemical inhomogeneities inside the Vela SNR shell.
  Indications of ejecta shrapnels

abstract:
  We present the results of the combined analysis of three XMM-Newton EPIC
observations of the northern rim of the Vela SNR. The three pointings cover an
area of ~10 pc^2 (at 250 pc) behind the main shock front and we aim at studying
with high resolution the spatial distribution of the physical and chemical
properties of the X-ray emitting plasma on this large scale. We produce
count-rate images and equivalent width maps of the Ne IX and Mg XI emission
blends. We also perform a spatially resolved spectral analysis of a set of
physically homogeneous regions. We reveal physical and chemical inhomogeneities
in the X-ray emitting plasma. In particular, we find large variations of the O,
Ne, Mg, and Fe abundances. In some bright knots we also find unexpectedly
enhanced Ne and Mg abundances, with values significantly larger than solar. Our
results support a possible association of a few X-ray emitting knots with
previously undetected residuals of stellar fragments (i. e. shrapnels)
observed, in projection, inside the Vela shell.


title: SLE and the free field: Partition functions and couplings

abstract:
  Schramm-Loewner Evolutions ($\SLE$) are random curves in planar simply
connected domains; the massless (Euclidean) free field in such a domain is a
random distribution. Both have conformal invariance properties in law. In the
present article, some relations between the two objects are studied. We
establish identities of partition functions between different versions of
$\SLE$ and the free field with appropriate boundary conditions; this involves
$\zeta$-regularization and the Polyakov-Alvarez conformal anomaly formula. We
proceed with a construction of couplings of $\SLE$ with the free field, showing
that, in a precise sense, chordal $\SLE$ is the solution of a stochastic
"differential" equation driven by the free field. Existence, uniqueness in law,
and pathwise uniqueness for these SDEs are proved for general $\kappa>0$.


title: When Do Random Subsets Decompose a Finite Group?

abstract:
  Let A,B be two random subsets of a finite group G. We consider the event that
the products of elements from A and B span the whole group; i.e. (AB union BA)
= G. The study of this event gives rise to a group invariant we call \Theta(G).
\Theta(G) is between 1/2 and 1, and is 1 if and only if the group is abelian.
We show that a phase transition occurs as the size of A and B passes
\sqrt{\Theta(G)|G|\log|G|}; i.e. for any c>0, if the size of A and B is less
than (1-c)\sqrt{\Theta(G)|G|\log|G|}, then with high probability (AB union BA)
does not equal G. If A and B are larger than (1+c)\sqrt{\Theta(G)|G|\log|G|}
then (AB union BA) equals G with high probability.


title:
Operating Regimes of Signaling Cycles: Statics, Dynamics, and Noise
  Filtering

abstract:
  A ubiquitous building block of signaling pathways is a cycle of covalent
modification (e.g., phosphorylation and dephosphorylation in MAPK cascades).
Our paper explores the kind of information processing and filtering that can be
accomplished by this simple biochemical circuit.
  Signaling cycles are particularly known for exhibiting a highly sigmoidal
(ultrasensitive) input-output characteristic in a certain steady-state regime.
Here we systematically study the cycle's steady-state behavior and its response
to time-varying stimuli. We demonstrate that the cycle can actually operate in
four different regimes, each with its specific input-output characteristics.
These results are obtained using the total quasi-steady-state approximation,
which is more generally valid than the typically used Michaelis-Menten
approximation for enzymatic reactions. We invoke experimental data that
suggests the possibility of signaling cycles operating in one of the new
regimes.
  We then consider the cycle's dynamic behavior, which has so far been
relatively neglected. We demonstrate that the intrinsic architecture of the
cycles makes them act - in all four regimes - as tunable low-pass filters,
filtering out high-frequency fluctuations or noise in signals and environmental
cues. Moreover, the cutoff frequency can be adjusted by the cell. Numerical
simulations show that our analytical results hold well even for noise of large
amplitude. We suggest that noise filtering and tunability make signaling cycles
versatile components of more elaborate cell signaling pathways.


title: Modular classes of Lie algebroid morphisms

abstract:
  We study the behavior of the modular class of a Lie algebroid under general
Lie algebroid morphisms by introducing the relative modular class. We
investigate the modular classes of pull-back morphisms and of base-preserving
morphisms associated to Lie algebroid extensions. We also define generalized
morphisms, including Morita equivalences, that act on the 1-cohomology, and
observe that the relative modular class is a coboundary on the category of Lie
algebroids and generalized morphisms with values in the 1-cohomology.


title: Can the flyby anomalies be explained by a modification of inertia?

abstract:
  The flyby anomalies are unexplained velocity increases of 3.9, 13.5, 0.1 and
1.8 mm/s observed near closest approach during the Earth flybys of the Galileo,
NEAR, Cassini and Rosetta spacecraft. Here, these flybys are modelled using a
theory that assumes that inertia is caused by a form of Unruh radiation,
modified by a Hubble-scale Casimir effect. This theory predicts that when the
craft's accelerations relative to the galactic centre approached zero near
closest approach, their inertial masses reduced for about 10^-7 s causing
Earthward jumps of 2.6, 1.2, 1.4 and 1.9 mm/s respectively, and, to conserve
angular momentum, increases in orbital velocity of a few mm/s that, except
NEAR's, were quite close to those observed. However, these results were
extremely sensitive to the Hubble constant used. As an experimental test of
these ideas, it is proposed that metamaterials could be used to bend Unruh
radiation around objects, possibly reducing their inertial mass.


title: Renormalisation-induced phase transitions for unimodal maps

abstract:
  The thermodynamical formalism is studied for renormalisable maps of the
interval and the natural potential $-t \log|Df|$. Multiple and indeed
infinitely many phase transitions at positive $t$ can occur for some quadratic
maps. All unimodal quadratic maps with positive topological entropy exhibit a
phase transition in the negative spectrum.


title: Detection of a relic X-ray jet in Cygnus A

abstract:
  We present a 200 ks Chandra ACIS-I image of Cygnus A, and discuss a long
linear feature seen in its counterlobe. This feature has a non-thermal spectrum
and lies on the line connecting the brighter hotspot on the approaching side
and the nucleus. We therefore conclude that this feature is (or was) a jet.
However, the outer part of this X-ray jet does not trace the current counterjet
observed in radio. No X-ray counterpart is observed on the jet side. Using
light-travel time effects we conclude that this X-ray 50 kpc linear feature is
a relic jet that contains enough low-energy plasma (gamma ~ 10^3) to
inverse-Compton scatter cosmic microwave background photons, producing emission
in the X-rays.