title: Defects in affine Toda field theories

abstract:
  In this talk some classical and quantum aspects concerning a special kind of
integrable defect - called a jump-defect - will be reviewed. In particular,
recent results obtained in an attempt to incorporate this defect in the affine
Toda field theories, in addition to the sine-Gordon model, will be presented.


title:
Concatenating Variational Principles and the Kinetic
  Stress-Energy-Momentum Tensor

abstract:
  We show how to "concatenate" variational principles over different bases into
one over a single base, thereby providing a unified Lagrangian treatment of
interacting systems. As an example we study a Klein-Gordon field interacting
with a mesically charged particle. We employ our method to give a novel
group-theoretic derivation of the kinetic stress-energy-momentum tensor density
corresponding to the particle.


title: Chern-Simons D=3, N=6 superfield theory

abstract:
  We construct the D=3, N=5 harmonic superspace using the SO(5)/U(1) x U(1)
harmonics. Three gauge harmonic superfields satisfy the off-shell constraints
of the Grassmann and harmonic analyticities. The corresponding component
supermultiplet contains the gauge field A_m and an infinite number of bosonic
and fermionic fields with the SO(5) vector indices arising from decompositions
of gauge superfields in harmonics and Grassmann coordinates. The nonabelian
superfield Chern-Simons action is invariant with respect to the N=6
superconformal supersymmetry realized on the N=5 superfields. The component
Lagrangian contains the Chern-Simons interaction of A_m and an infinite number
of bilinear and trilinear interactions of auxiliary fields. The fermionic and
bosonic auxiliary fields from the infinite N=5 multiplet vanish on-shell.


title:
Proceedings to the 10th Workshop 'What Comes Beyond the Standard
  Models', Bled, July 17. - 27., 2007, Slovenia

abstract:
  Contents: 1. Finestructure Constants at the Planck Scale from Multiple Point
Principle (D.L.Bennett, L.V. Laperashvili and H.B. Nielsen) 2. Random Dynamics
in Starting Levels (D. Bennett, A. Kleppe in H.B. Nielsen), 3. Families of
Quarks and Leptons and Their Mass Matrices from the Approach Unifying Spins and
Charges: Prediction for the Fourth Family (G. Bregar, M. Breskvar, D. Lukman
and N.S. Mankoc Borstnik) 4. Fermion-Fermion and Boson-Boson Amplitudes:
Surprising Similarities (V.V. Dvoeglazov) 5. Antisymmetric Tensor Fields,
4-Vector Fields, Indefinite Metrics and Normalization (V.V. Dvoeglazov) 6.
Quantum Gates and Quantum Algorithms with Clifford Algebra Technique (M.
Gregoric and N.S. Mankoc Borstnik) 7. From the Starting Lagrange Density to the
Effective Fields for Spinors in the Approach Unifying Spins and Charges (N.S.
Mankoc Borstnik) 8. New Generations of Particles in the Universe (M.Yu.
Khlopov) 9. A Subversive View of Modern 'Physics' (R. Mirman) 10. Mass Spectra
are Inherent in Geometry: an Analysis Using the Only Conformal Group Allowing a
Universe (R. Mirman) 11. Complex Action, Prearrangement for Future and Higgs
Broadening (H.B. Nielsen and M. Ninomiya) 12. Discussion on Dark Matter
Candidates from the Approach Unifying Spins and Charges (G. Bregar and N.S.
Mankoc Borstnik) 13. Discussion Section Summary on Dark Matter Particle
Properties (M.Yu. Khlopov and N.S. Mankoc Borstnik)


title: Approximate $w_\phi\sim\Omega_\phi$ Relations in Quintessence Models

abstract:
  Quintessence field is a widely-studied candidate of dark energy. There is
"tracker solution" in quintessence models, in which evolution of the field
$\phi$ at present times is not sensitive to its initial conditions. When the
energy density of dark energy is neglectable ($\Omega_\phi\ll1$), evolution of
the tracker solution can be well analysed from "tracker equation". In this
paper, we try to study evolution of the quintessence field from "full tracker
equation", which is valid for all spans of $\Omega_\phi$. We get stable fixed
points of $w_\phi$ and $\Omega_\phi$ (noted as $\hat w_\phi$ and
$\hat\Omega_\phi$) from the "full tracker equation", i.e., $w_\phi$ and
$\Omega_\phi$ will always approach $\hat w_\phi$ and $\hat\Omega_\phi$
respectively. Since $\hat w_\phi$ and $\hat\Omega_\phi$ are analytic functions
of $\phi$, analytic relation of $\hat w_\phi\sim\hat\Omega_\phi$ can be
obtained, which is a good approximation for the $w_\phi\sim\Omega_\phi$
relation and can be obtained for the most type of quintessence potentials. By
using this approximation, we find that inequalities $\hat w_\phi<w_\phi$ and
$\hat\Omega_\phi<\Omega_\phi$ are statisfied if the $w_\phi$ (or $\hat w_\phi$)
is decreasing with time. In this way, the potential $U(\phi)$ can be
constrained directly from observations, by no need of solving the equations of
motion numerically.


title:
Functional integral with $\phi^4$ term in the action beyond standard
  perturbative methods II

abstract:
  To avoid problems with infinite measure, the functional integral for harmonic
oscillator can be calculated by time - slicing method with continuum limit
procedure proposed Gelfand and Yaglom. In previous article we proved by
nonperturbative calculation the generalized Gelfand-Yaglom equation for
anharmonic oscillator with positive or negative mass term. In this article we
prove by step-by-step the calculation of the correction function to the
Gelfand-Yaglom equation for an-harmonic oscillator.


title: Quantum Hall wave functions on the torus

abstract:
  We present explicit expressions for a large set of hierarchy wave functions
on the torus. Included are the Laughlin states, the states in the positive Jain
series, and recently observed states at e.g. $\nu = 4/11$. The techniques we
use constitute a nontrivial extension of the conformal field theory methods
developed earlier to construct the corresponding wave functions in disc
geometry.


title: A new dissipation term for finite-difference simulations in Relativity

abstract:
  We present a new numerical dissipation algorithm, which can be efficiently
used in combination with centered finite-difference methods. We start from a
formulation of centered finite-volume methods for Numerical Relativity, in
which third-order space accuracy can be obtained by employing just
piecewise-linear reconstruction. We obtain a simplified version of the
algorithm, which can be viewed as a centered finite-difference method plus some
'adaptive dissipation'. The performance of this algorithm is confirmed by
numerical results obtained from 3D black hole simulations.


title:
Measuring the non-thermal pressure in early type galaxy atmospheres: A
  comparison of X-ray and optical potential profiles in M87 and NGC1399

abstract:
  We compare the gravitational potential profiles of the elliptical galaxies
NGC 4486 (M87) and NGC 1399 (the central galaxy in the Fornax cluster) derived
from X-ray and optical data. This comparison suggests that the combined
contribution of cosmic rays, magnetic fields and micro-turbulence to the
pressure is ~10% of the gas thermal pressure in the cores of NGC 1399 and M87,
although the uncertainties in our model assumptions (e.g., spherical symmetry)
are sufficiently large that the contribution could be consistent with zero. In
the absence of any other form of non-thermal pressure support, these upper
bounds translate into upper limits on the magnetic field of ~10-20 muG at a
distance of 1'-2' from the centers of NGC1399 and M87. We show that these
results are consistent with the current paradigm of cool cluster cores, based
on the assumption that AGN activity regulates the thermal state of the gas by
injecting energy into the intra-cluster medium. The limit of ~10-20% on the
energy density in the form of relativistic protons applies not only to the
current state of the gas, but essentially to the entire history of the
intra-cluster medium, provided that cosmic ray protons evolve adiabatically and
that their spatial diffusion is suppressed.


title: A superstatistical model of metastasis and cancer survival

abstract:
  We introduce a superstatistical model for the progression statistics of
malignant cancer cells. The metastatic cascade is modeled as a complex
nonequilibrium system with several macroscopic pathways and inverse-chi-square
distributed parameters of the underlying Poisson processes. The predictions of
the model are in excellent agreement with observed survival time probability
distributions of breast cancer patients.


title: Central extensions of Lax operator algebras

abstract:
  Lax operator algebras were introduced by Krichever and Sheinman as a further
development of I.Krichever's theory of Lax operators on algebraic curves. These
are almost-graded Lie algebras of current type. In this article local cocycles
and associated almost-graded central extensions are classified. It is shown
that in the case that the corresponding finite-dimensional Lie algebra is
simple the two-cohomology space is one-dimensional. An important role is played
by the action of the Lie algebra of meromorphic vector fields on the Lax
operator algebra via suitable covariant derivatives.


title:
The polyhedral product functor: a method of computation for moment-angle
  complexes, arrangements and related spaces

abstract:
  This article gives a natural decomposition of the suspension of generalized
moment-angle complexes or {\it partial product spaces} which arise as {\it
polyhedral product functors} described below.
  In the special case of the complements of certain subspace arrangements, the
geometrical decomposition implies the homological decomposition in
Goresky-MacPherson \cite{goresky.macpherson}, Hochster\cite{hochster}, Baskakov
\cite{baskakov}, Panov \cite{panov}, and Buchstaber-Panov
\cite{buchstaber.panov}. Since the splitting is geometric, an analogous
homological decomposition for a generalized moment-angle complex applies for
any homology theory. This decomposition gives an additive decomposition for the
Stanley-Reisner ring of a finite simplicial complex and generalizations of
certain homotopy theoretic results of Porter \cite{porter} and Ganea
\cite{ganea}. The spirit of the work here follows that of Denham-Suciu in
\cite{denham.suciu}.


title:
Obtaining the Gauge Invariant Kinetic Term for a SU(n)$_U$ x SU(m)$_V$
  Lagrangian

abstract:
  We propose a generalized way to formally obtain the gauge invariance of the
kinetic part of a field Lagrangian over which a gauge transformation ruled by
an $SU(n)_{U} \otimes SU(m)_{V}$ coupling symmetry is applied. As an
illustrative example, we employ such a formal construction for reproducing the
standard model Lagrangian. This generalized formulation is supposed to
contribute for initiating the study of gauge transformation applied to
generalized $SU(n)_{U} \otimes SU(m)_{V}$ symmetries as well as for
complementing an introductory study of the standard model of elementary
particles.


title:
Study of an Abelinization Transition in SU(2) Gluodynamics at Finite
  Temperature

abstract:
  We discuss the problem of an effective descriptions of the phase transition
phenomena in the pure gluodynamics in SU(2) symmetric QCD. We choose the method
of calculation following the conjecture that the infrared sector of the theory
possesses the same confinement characteristic as the full theory. We show, that
analytic descriptions of this phenomena is beyond the Gaussian method of
evaluations of functional integrals. We propose a non-perturbative evaluation
of functional integral, meanwhile for two dimensional Wiener integral for
$\phi^4$ theory.


title: Variational derivation of the Camassa-Holm shallow water equation

abstract:
  We describe the physical hypothesis in which an approximate model of water
waves is obtained. For an irrotational unidirectional shallow water flow, we
derive the Camassa-Holm equation by a variational approach in the Lagrangian
formalism.


title: A Deep Catalog of Variable Stars in a 0.66deg^2 Lupus Field

abstract:
  We have conducted a wide-field photometric survey in a single 52'x52' field
towards the Lupus Galactic Plane in an effort to detect transiting Hot Jupiter
planets. The planet Lupus-TR-3b was identified from this work. The dataset also
led to the detection of 494 field variables, all of which are new discoveries.
This paper presents an overview of the project, along with the total catalog of
variables, which comprises 190 eclipsing binaries (of contact, semi-contact and
detached configurations), 51 miscellaneous pulsators of various types, 237 long
period variables (P>=2d), 11 delta Scuti stars, 4 field RR Lyrae (3 disk and 1
halo) and 1 irregular variable. Our survey provides a complete catalog of W UMa
eclipsing binaries in the field to V=18.8, which display a Gaussian period
distribution of 0.277+/-0.036d. Several binary systems are likely composed of
equal mass M-dwarf components and others display evidence of mass transfer. We
find 17 candidate blue stragglers and one binary that has the shortest period
known, 0.2009d (V=20.9). The frequency of eclipsing binaries (all types) is
found to be 1.7+/-0.4x10^{-3} per star, substantially higher (by a factor of
3-10) than previously determined in the haloes of the globular clusters 47 Tuc
and omega Cen. This indicates that cluster dynamics aids mass segregation and
binary destruction.


title:
A high resolution scintillating fiber tracker with SiPM readout for the
  PEBS experiment

abstract:
  Using thin scintillating fibers with Silicon Photomultiplier (SiPM) readout a
mo dular high-resolution charged-particle tracking detector has been designed.
The fiber modules consist of 2 x 5 layers of 128 round multiclad scintillating
fiber s of 0.250mm diameter. The fibers are read out by four SiPM arrays (8mm x
1mm) e ach on either end of the module.


title:
Delay Times for Symmetrized and Antisymmetrized Quantum Tunneling
  Configurations

abstract:
  The transit times are obtained for a symmetrized (two identical bosons) and
an antisymmetrized (two identical fermions) quantum colliding configuration.
Considering two identical particles symmetrically impinging on a
one-dimensional barrier, we demonstrate that the phase time and the dwell time
give connected results where, however, the exact position of the scattered
particles is explicitly determined by the phase time (group delay). For the
antisymmetrized wave function configuration, an unusual effect of {\em
accelerated} transmission is clearly identified in a simultaneous tunneling of
two identical fermions.


title:
Elliptic polynomials orthogonal on the unit circle with a dense point
  spectrum

abstract:
  We introduce two explicit examples of polynomials orthogonal on the unit
circle. Moments and the reflection coefficients are expressed in terms of
Jacobi elliptic functions. We find explicit expression for these polynomials in
terms of a new type of elliptic hypergeometric function. We show that obtained
polynomials are orthogonal on the unit circle with respect to a dense point
meausure, i.e. the spectrum consists from infinite number points of increase
which are dense on the unit circle. We construct also corresponding explicit
systems of polynomials orthogonal on the interval of the real axis with respect
to a dense point measure. They can be considered as an elliptic generalization
of the Askey-Wilson polynomials of a special type.


title: Anyons and the quantum Hall effect - a pedagogical review

abstract:
  The dichotomy between fermions and bosons is at the root of many physical
phenomena, from metallic conduction of electricity to super-fluidity, and from
the periodic table to coherent propagation of light. The dichotomy originates
from the symmetry of the quantum mechanical wave function to the interchange of
two identical particles. In systems that are confined to two spatial dimensions
particles that are neither fermions nor bosons, coined "anyons", may exist. The
fractional quantum Hall effect offers an experimental system where this
possibility is realized. In this paper we present the concept of anyons, we
explain why the observation of the fractional quantum Hall effect almost forces
the notion of anyons upon us, and we review several possible ways for a direct
observation of the physics of anyons. Furthermore, we devote a large part of
the paper to non-abelian anyons, motivating their existence from the point of
view of trial wave functions, giving a simple exposition of their relation to
conformal field theories, and reviewing several proposals for their direct
observation.


title: H\"older-differentiability of Gibbs distribution functions

abstract:
  In this paper we give non-trivial applications of the thermodynamic formalism
to the theory of distribution functions of Gibbs measures (devil's staircases)
supported on limit sets of finitely generated conformal iterated function
systems in $\R$. For a large class of these Gibbs states we determine the
Hausdorff dimension of the set of points at which the distribution function of
these measures is not $\alpha$-H\"older-differentiable. The obtained results
give significant extensions of recent work by Darst, Dekking, Falconer, Li,
Morris, and Xiao. In particular, our results clearly show that the results of
these authors have their natural home within thermodynamic formalism.


title:
Theory of fluorescence correlation spectroscopy at variable observation
  area for two-dimensional diffusion on a meshgrid

abstract:
  It has recently been proposed, with the help of numerical investigations,
that fluorescence correlation spectroscopy at variable observation area can
reveal the existence of a meshgrid of semi-permeable barriers hindering the
two-dimensional diffusion of tagged particles, such as plasmic membrane
constituents. We present a complete theory confirming and accounting for these
findings. It enables a reliable, quantitative exploitation of experimental data
from which the sub-wavelength mesh size can be extracted. Time scales at which
fluorescence correlation spectroscopy must be performed experimentally are
discussed in detail.


title: Galactic Dynamos and Galactic Winds

abstract:
  Spiral galaxies host dynamically important magnetic fields which can affect
gas flows in the disks and halos. Total magnetic fields in spiral galaxies are
strongest (up to 30 \muG) in the spiral arms where they are mostly turbulent or
tangled. Polarized synchrotron emission shows that the resolved regular fields
are generally strongest in the interarm regions (up to 15 \muG). Faraday
rotation measures of radio polarization vectors in the disks of several spiral
galaxies reveal large-scale patterns which are signatures of coherent fields
generated by a mean-field dynamo. -- Magnetic fields are also observed in radio
halos around edge-on galaxies at heights of a few kpc above the disk.
Cosmic-ray driven galactic winds transport gas and magnetic fields from the
disk into the halo. The magnetic energy density is larger than the thermal
energy density, but smaller than the kinetic energy density of the outflow. The
orientation of field lines allows to estimate the wind speed and direction.
There is no observation yet of a halo with a large-scale coherent dynamo
pattern. A global wind outflow may prevent the operation of a dynamo in the
halo. -- Halo regions with high degrees of radio polarization at very large
distances from the disk are excellent tracers of interaction between galaxies
or ram pressure of the intergalactic medium. The observed extent of radio halos
is limited by energy losses of the cosmic-ray electrons. -- Future
low-frequency radio telescopes like LOFAR and the SKA will allow to trace halo
outflows and their interaction with the intergalactic medium to much larger
distances.


title:
Variational derivation of the Camassa-Holm shallow water equation with
  non-zero vorticity

abstract:
  We describe the physical hypotheses underlying the derivation of an
approximate model of water waves. For unidirectional surface shallow water
waves moving over an irrotational flow as well as over a non-zero vorticity
flow, we derive the Camassa-Holm equation by an interplay of variational
methods and small-parameter expansions.


title:
Quantum and classical multiple scattering effects in spin dynamics of
  cavity polaritons

abstract:
  The transport properties of exciton-polaritons are studied with allowance for
their polarization. Both classical multiple scattering effects and quantum
effects such as weak localization are taken into account in the framework of a
generalized kinetic equation. The longitudinal-transverse (TE-TM) splitting of
polariton states which plays role analogous to the spin-orbit splitting in
electron systems is taken into account. The developed formalism is applied to
calculate the particle and spin diffusion coefficients of exciton-polaritons,
spin relaxation rates and the polarization conversion efficiency under the
conditions of the optical spin Hall effect. In contrast to the electron
systems, strong spin splitting does not lead to the antilocalization behavior
of the particle diffusion coefficient, while quantum corrections to spin
diffusion and polarization conversion can be both negative and positive
depending on the spin splitting value.


title: Optical Simulation of Yang-Baxter Equation

abstract:
  In this paper, several proposals of optically simulating Yang-Baxter
equations have been presented. Motivated by the recent development of anyon
theory, we apply Temperley-Lieb algebra as a bridge to recast four-dimentional
Yang-Baxter equation into its two-dimensional counterpart. In accordance with
both representations, we find the corresponding linear-optical simulations,
based on the highly efficient optical elements. Both the freedom degrees of
photon polarization and location are utilized as the qubit basis, in which the
unitary Yang-Baxter matrices are decomposed into combination of actions of
basic optical elements.


title: Phase transition to bundles of flexible supramolecular polymers

abstract:
  We report Monte Carlo simulations of the self-assembly of supramolecular
polymers based on a model of patchy particles. We find a first-order phase
transition, characterized by hysteresis and nucleation, toward a solid bundle
of polymers, of length much greater than the average gas phase length. We argue
that the bundling transition is the supramolecular equivalent of the
sublimation transition, that results from a weak chain-chain interaction. We
provide a qualitative equation of state that gives physical insight beyond the
specific values of the parameters used in our simulations.


title: Cavity-induced temperature control of a two-level system

abstract:
  We consider a two-level atom interacting with a single mode of the
electromagnetic field in a cavity within the Jaynes-Cummings model. Initially,
the atom is thermal while the cavity is in a coherent state. The atom interacts
with the cavity field for a fixed time. After removing the atom from the cavity
and applying a laser pulse the atom will be in a thermal state again. Depending
on the interaction time with the cavity field the final temperature can be
varied over a large range. We discuss how this method can be used to cool the
internal degrees of freedom of atoms and create heat baths suitable for
studying thermodynamics at the nanoscale.


title: Ranks of elliptic curves over function fields

abstract:
  We present experimental evidence to support the widely held belief that one
half of all elliptic curves have infinitely many rational points. The method
used to gather this evidence is a refinement of an algorithm due to the author
which is based upon rigid and crystalline cohomology.


title: The Fundamental k-Form and Global Relations

abstract:
  In [Proc. Roy. Soc. London Ser. A 453 (1997), no. 1962, 1411-1443] A.S. Fokas
introduced a novel method for solving a large class of boundary value problems
associated with evolution equations. This approach relies on the construction
of a so-called global relation: an integral expression that couples initial and
boundary data. The global relation can be found by constructing a differential
form dependent on some spectral parameter, that is closed on the condition that
a given partial differential equation is satisfied. Such a differential form is
said to be fundamental [Quart. J. Mech. Appl. Math. 55 (2002), 457-479]. We
give an algorithmic approach in constructing a fundamental k-form associated
with a given boundary value problem, and address issues of uniqueness. Also, we
extend a result of Fokas and Zyskin to give an integral representation to the
solution of a class of boundary value problems, in an arbitrary number of
dimensions. We present an extended example using these results in which we
construct a global relation for the linearised Navier-Stokes equations.


title: On the theory of resonances in non-relativistic QED and related models

abstract:
  We study the mathematical theory of quantum resonances in the standard model
of non-relativistic QED and in Nelson's model. In particular, we estimate the
survival probability of metastable states corresponding to quantum resonances
and relate the resonances to poles of an analytic continuation of matrix
elements of the resolvent of the quantum Hamiltonian.


title:
Medium Modifcations of Mesons in Elementary Reactions and Heavy-Ion
  Collisions

abstract:
  Experimental searches for modifications of vector mesons in the nuclear
medium are reviewed. Data on $\rho,\omega$ and $\Phi$ mesons are presented. The
results have been obtained in elementary reactions with proton and photon beams
as well as in heavy-ion collisions. Compared to the free particle properties,
the $\omega$ and $\Phi$ meson are found to drop in mass at normal nuclear
matter density by 9-14% and 3.5% whereas their widths are reported to increase
by factors of about 16 and 3.6, respectively. For the $\rho$ meson, conflicting
results on in-medium mass shifts and broadening have been published. The
experimental data are compared to recent model calculations.


title: Effects of network topology on wealth distributions

abstract:
  We focus on the problem of how wealth is distributed among the units of a
networked economic system. We first review the empirical results documenting
that in many economies the wealth distribution is described by a combination of
log--normal and power--law behaviours. We then focus on the Bouchaud--M\'ezard
model of wealth exchange, describing an economy of interacting agents connected
through an exchange network. We report analytical and numerical results showing
that the system self--organises towards a stationary state whose associated
wealth distribution depends crucially on the underlying interaction network. In
particular we show that if the network displays a homogeneous density of links,
the wealth distribution displays either the log--normal or the power--law form.
This means that the first--order topological properties alone (such as the
scale--free property) are not enough to explain the emergence of the
empirically observed \emph{mixed} form of the wealth distribution. In order to
reproduce this nontrivial pattern, the network has to be heterogeneously
divided into regions with variable density of links. We show new results
detailing how this effect is related to the higher--order correlation
properties of the underlying network. In particular, we analyse assortativity
by degree and the pairwise wealth correlations, and discuss the effects that
these properties have on each other.

categories: q-fin.GN nlin.AO physics.data-an physics.soc-ph


title: NNLO corrections to event shapes in $e^+e^-$ annihilation

abstract:
  We compute the next-to-next-to-leading order (NNLO) QCD corrections to the
six most important event shape variables related to three-particle final states
in electron-positron annihilation. The corrections are sizeable for all
variables, however their magnitude is substantially different for different
observables. We observe that the NNLO corrections yield a considerably better
agreement between theory and experimental data both in shape and normalisation
of the event shape distributions. The renormalisation scale dependence of the
theoretical prediction is substantially reduced compared to the previously
existing NLO results. Our results will allow a precise determination of the
strong coupling constant from event shape data collected at LEP.


title: Programmable discriminator of coherent states - experimental realization

abstract:
  The optical implementation of the recently proposed unambiguous
identification of coherent states is presented. Our system works as a
programmable discriminator between two, in general non-orthogonal weak coherent
states. The principle of operation lies in the interference of three light
beams - two program states and one unknown coherent state which can be equal to
whichever of the two program states. The experiment is based on fiber optics.
Its results confirm theoretical predictions and the experimental setup can be
straightforwardly extended for higher numbers of program states.


title: Six-Photon Amplitudes in Scalar QED

abstract:
  The analytical result for the six-photon helicity amplitudes in scalar QED is
presented. To compute the loop, a recently developed method based on multiple
cuts is used. The amplitudes for QED and $QED^{\caln=1}$ are also derived using
the supersymmetric decomposition linking the three theories.


title:
Effects due to Resonant and Continuum States on the Neutrino-Nucleus
  Cross Section

abstract:
  Estimates of the neutrino-nucleus cross section, for the charged-current
process nu+208Pb-> e+208Bi, are presented. The nuclear structure calculations
have been performed by considering bound, resonant, and continuum states in the
single-particle basis used to construct correlated proton-particle neutron-hole
configurations. The observed features of the spectrum of 208Bi have been
reproduced, as accurately as possible, by diagonalizing a phenomenological
multipole-multipole interaction. Calculations of the cross section, for values
of q 200 $ MeV, were performed, and the dependence of the results upon the
choice of the residual proton-neutron interaction was investigated. It is found
that the inclusion of resonant states in the calculation of the nuclear wave
functions increases the neutrino-nucleus cross section, and that the
contribution of the continuum is negligible.


title: The RMS Survey: A Galaxy-wide Sample of Massive Young Stellar Objects

abstract:
  Here we describe the Red MSX Source (RMS) survey which is the largest,
systematic, galaxy-wide search for massive young stellar objects (MYSOs) yet
undertaken. Mid-IR bright point sources from the MSX satellite survey have been
followed-up with ground-based radio, millimetre, and infrared observations to
identify the contaminating sources and characterise the MYSOs and UCHII
regions. With the initial classification now complete the distribution of
sources in the galaxy will be discussed, as well as some programmes being
developed to exploit our sample.


title: The Theory of Kairons

abstract:
  In relativistic quantum mechanics wave functions of particles satisfy field
equations that have initial data on a space--like hypersurface. We propose a
dual field theory of ``wavicles'' that have their initial data on a time--like
worldline. Propagation of such fields is superluminal, even though the Hilbert
space of the solutions carries a unitary representation of the Poincare group
of mass zero. We call the objects described by these field equations
``Kairons''. The paper builds the field equations in a general relativistic
framework, allowing for a torsion. Kairon fields are section of a vector bundle
over space-time. The bundle has infinite--dimensional fibres.


title: Five Conferences on Undecidability

abstract:
  These five lectures on undecidability were given to students with a good
level in mathematics but with no special knowledge on logic. The first
conference presents the formalization of mathematics with a short historical
survey, the language of first order predicates and the axioms of set theory.
The second and third lectures explain the incompleteness phenomena from the
Hilbert program until G\"odel's theorems with a presentation of the sequent
calculus of Gentzen.The fourth talk deepens model theory reasoning in the case
of the continuum hypothesis, and the last conference gives examples of
effective computability results.


title:
Increase of Thermal Resistance Between a Nanostructure and a Surface due
  to Phonon Multireflections

abstract:
  The thermal resistance between a nanostructure and a half-body is calculated
in the framework of particle-phonons physics. The current models approximate
the nanostructure as a thermal bath. We prove that the multireflections of heat
carriers in the nanostructure significantly increase resistance in
contradiction with former predictions. This increase depends on the shape of
the nanostructure and the heat carriers mean free path only. We provide a
general and simple expression for the contact resistance and examine the
specific cases of nanowires and nanoparticles.


title: Young stellar populations in the Magellanic Clouds

abstract:
  We discuss the young population of stars and clusters in the Magellanic
Clouds. We present the discovery of pre-main sequence candidates in the nebula
N~11 in the Large Magellanic Clouds using HST ACS photometry. The comparison of
the Colour-Magnitude diagram with pre-main sequence tracks and the presence of
Spitzer objects YSO I and II suggest that the star formation has been active
for a long period in the region, from a few $10^5$ yrs to several Myr ago


title: Realization of XNOR and NAND spin-wave logic gates

abstract:
  We demonstrate the functionality of spin-wave logic XNOR and NAND gates based
on a Mach-Zehnder type interferometer which has arms implemented as sections of
ferrite film spin-wave waveguides. Logical input signals are applied to the
gates by varying either the phase or the amplitude of the spin waves in the
interferometer arms. This phase or amplitude variation is produced by Oersted
fields of dc current pulses through conductors placed on the surface of the
magnetic films.


title: New Lump-like Structures in Scalar-field Models

abstract:
  In this work we investigate lump-like solutions in models described by a
single real scalar field. We start considering non-topological solutions with
the usual lump-like form, and then we study other models, where the bell-shape
profile may have varying amplitude and width, or develop a flat plateau at its
top, or even induce a lump on top of another lump. We suggest possible
applications where these exotic solutions might be used in several distinct
branches of physics.


title: The heavy-quark potential in an anisotropic plasma

abstract:
  We determine the hard-loop resummed propagator in an anisotropic QCD plasma
in general covariant gauges and define a potential between heavy quarks from
the Fourier transform of its static limit. We find that there is stronger
attraction on distance scales on the order of the inverse Debye mass for quark
pairs aligned along the direction of anisotropy than for transverse alignment.


title: The Israel Theorem: What is Nature Trying to Tell Us?

abstract:
  We explore the possible physical consequences derived from the fact that the
only static and asymptotically-flat vacuum space-time possessing a regular
horizon is the Schwarzschild solution (Israel theorem). If small deviations
from the Schwarzschild metric are described by means of exact solutions to
Einstein equations (as it should be), then for very compact configurations, at
the time scale at which radiatable multipole moments are radiated away,
important physical phenomena should occur, as illustrated by some results on
different solutions beloging to the Weyl class of static axially--symmetric
solutions to the Einstein equations.


title: A viscoelastic deadly fluid in carnivorous pitcher plants

abstract:
  Background : The carnivorous plants of the genus Nepenthes, widely
distributed in the Asian tropics, rely mostly on nutrients derived from
arthropods trapped in their pitcher-shaped leaves and digested by their
enzymatic fluid. The genus exhibits a great diversity of prey and pitcher forms
and its mechanism of trapping has long intrigued scientists. The slippery inner
surfaces of the pitchers, which can be waxy or highly wettable, have so far
been considered as the key trapping devices. However, the occurrence of species
lacking such epidermal specializations but still effective at trapping insects
suggests the possible implication of other mechanisms. Methodology/Principal
Findings : Using a combination of insect bioassays, high-speed video and
rheological measurements, we show that the digestive fluid of Nepenthes
rafflesiana is highly viscoelastic and that this physical property is crucial
for the retention of insects in its traps. Trapping efficiency is shown to
remain strong even when the fluid is highly diluted by water, as long as the
elastic relaxation time of the fluid is higher than the typical time scale of
insect movements. Conclusions/Significance : This finding challenges the common
classification of Nepenthes pitchers as simple passive traps and is of great
adaptive significance for these tropical plants, which are often submitted to
high rainfalls and variations in fluid concentration. The viscoelastic trap
constitutes a cryptic but potentially widespread adaptation of Nepenthes
species and could be a homologous trait shared through common ancestry with the
sundew (Drosera) flypaper plants. Such large production of a highly
viscoelastic biopolymer fluid in permanent pools is nevertheless unique in the
plant kingdom and suggests novel applications for pest control.


title:
Asymptotically efficient estimators for nonparametric heteroscedastic
  regression models

abstract:
  This paper concerns the estimation of the regression function at a given
point in nonparametric heteroscedastic models with Gaussian noise or with noise
having unknown distribution. In the two cases an asymptotically efficient
kernel estimator is constructed for the minimax absolute error risk.


title:
Mean-field dynamo in a turbulence with shear and kinetic helicity
  fluctuations

abstract:
  We study effects of kinetic helicity fluctuations in a turbulence with
large-scale shear using two different approaches: the spectral
tau-approximation and the second order correlation approximation (or
first-order smoothing approximation). These two approaches demonstrate that
homogeneous kinetic helicity fluctuations alone with zero mean value in a
sheared homogeneous turbulence cannot cause large-scale dynamo. Mean-field
dynamo can be possible when kinetic helicity fluctuations are inhomogeneous
which cause a nonzero mean alpha effect in a sheared turbulence. On the other
hand, shear-current effect can generate large-scale magnetic field even in a
homogeneous nonhelical turbulence with large-scale shear. This effect was
investigated previously for large hydrodynamic and magnetic Reynolds numbers.
In this study we examine the threshold required for the shear-current dynamo
versus Reynolds number. We demonstrate that there is no need for a developed
inertial range in order to maintain the shear-current dynamo (e.g., the
threshold in the Reynolds number is of the order of 1).


title:
Third Family Corrections to Tri-bimaximal Lepton Mixing and a New Sum
  Rule

abstract:
  We investigate the theoretical stability of the predictions of tri-bimaximal
neutrino mixing with respect to third family wave-function corrections. Such
third family wave-function corrections can arise from either the canonical
normalisation of the kinetic terms or renormalisation group running effects. At
leading order both sorts of corrections can be subsumed into a single universal
parameter. For hierarchical neutrinos, this leads to a new testable lepton
mixing sum rule 's = r cos delta + 2/3 a' (where s, r, a describe the
deviations of solar, reactor and atmospheric mixing angles from their
tri-bimaximal values, and 'delta' is the observable Dirac CP phase) which is
stable under all leading order third family wave-function corrections, as well
as Cabibbo-like charged lepton mixing effects.


title: Rotation set and Entropy

abstract:
  In 1991 Llibre and MacKay proved that if $f$ is a 2-torus homeomorphism
isotopic to identity and the rotation set of $f$ has a non empty interior then
$f$ has positive topological entropy. Here, we give a converselike theorem. We
show that the interior of the rotation set of a 2-torus $C^{1+ \alpha}$
diffeomorphism isotopic to identity of positive topological entropy is not
empty, under the additional hypotheses that $f$ is topologically transitive and
irreducible. We also give examples that show that these hypotheses are
necessary.


title:
Bogoliubov theory of quantum correlations in the time-dependent
  Bose-Hubbard model

abstract:
  By means of an adapted mean-field expansion for large fillings $n\gg1$, we
study the evolution of quantum fluctuations in the time-dependent Bose-Hubbard
model, starting in the superfluid state and approaching the Mott phase by
decreasing the tunneling rate or increasing the interaction strength in time.
For experimentally relevant cases, we derive analytical results for the
temporal behavior of the number and phase fluctuations, respectively. This
allows us to calculate the growth of the quantum depletion and the decay of
off-diagonal long-range order. We estimate the conditions for the observability
of the time dependence in the correlation functions in the experimental setups
with external trapping present. Finally, we discuss the analogy to quantum
effects in the early universe during the inflationary epoch.


title: Ueber die Tiefe von Invariantenringen unendlicher Gruppen

abstract:
  Let K be an algebraically closed field. For a graded K-Algebra R, we write
cmdef R:=dim R -depth R. We show that for each reductive group G (over K) which
is not linearly reductive, there exists a faithful G-module V such that cmdef
K[\sum_i=1^k V]^G >= k-2 for all k. We will give such a V explicitly.


title:
Competing Orders in One-Dimensional Half-Integer Fermionic Cold Atoms: A
  Conformal Field Theory Approach

abstract:
  The physical properties of arbitrary half-integer spins F = N - 1/2 fermionic
cold atoms loaded into a one-dimensional optical lattice are investigated by
means of a conformal field theory approach. We show that for attractive
interactions two different superfluid phases emerge for F \ge 3/2: A BCS
pairing phase, and a molecular superfluid phase which is formed from
bound-states made of 2N fermions. In the low-energy approach, the competition
between these instabilities and charge-density waves is described in terms of
Z_N parafermionic degrees of freedom. The quantum phase transition for
F=3/2,5/2 is universal and shown to belong to the Ising and three-state Potts
universality classes respectively. For a filling of one atom per site, a Mott
transition occurs and the nature of the possible Mott-insulating phases are
determined.


title: Spherical symmetric charged solution with cosmological constant

abstract:
  A spherically symmetric charged ideal fluid solution of Einstein field
equation is given in the presence of the cosmological constant and two well
known example of this type of solution is presented. If the matter is confined
in a region, the exterior spacetime is considered as RN-de Sitter
(Reissner-Nordstrom de Sitter) and to complete solution matching conditions are
examined. We show that the function which is related to the dynamics of the
system will determine the fate of the system: expansion, contraction or
bouncing situations may occur for different configurations. The initial
conditions of the matter determine the final form of the system and therefore
the nature of the singularities in the presence of the electric charge and the
cosmological constant is examined to reveal their effects on the singularity
formation during collapse.


title:
A Coupled Oscillator Model for Grover's Quantum Database Search
  Algorithm

abstract:
  Grover's database search algorithm is the optimal algorithm for finding a
desired object from an unsorted collection of items. Although it was discovered
in the context of quantum computation, it is simple and versatile enough to be
implemented using any physical system that allows superposition of states, and
several proposals have been made in the literature. I study a mechanical
realisation of the algorithm using coupled simple harmonic oscillators, and
construct its physical model for the simplest case of four identical
oscillators. The identification oracle is implemented as an elastic reflection
of the desired oscillator, and the overrelaxation operation is realised as
evolution of the system by half an oscillation period. I derive the equations
of motion, and solve them both analytically and by computer simulation. I
extend the ideal case analysis and explore the sensitivity of the algorithm to
changes in the initial conditions, masses of springs and damping. The amplitude
amplification provided by the algorithm enhances the energy of the desired
oscillator, while running the algorithm backwards spreads out the energy of the
perturbed oscillator among its partners. The former (efficient focusing of
energy into a specific oscillator) can have interesting applications in
processes that need crossing of an energy threshold for completion, and can be
useful in nanotechnological devices and catalysis. The latter (efficient
redistribution of energy) can be useful in processes requiring rapid
dissipation of energy, such as shock-absorbers and vibrational shielding. I
present some tentative proposals.


title: Signed Chord Length Distribution. I

abstract:
  In this paper is discussed an application of signed measures (charges) to
description of segment and chord length distributions in nonconvex bodies. The
signed distribution may naturally appears due to definition via derivatives of
nonnegative autocorrelation function simply related with distances distribution
between pairs of points in the body. In the work is suggested constructive
geometrical interpretation of such derivatives and illustrated appearance of
"positive" and "negative" elements similar with usual Hanh-Jordan decomposition
in measure theory. The construction is also close related with applications of
Dirac method of chords.


title:
Recovering the stationary phase condition for accurately obtaining
  scattering and tunneling times

abstract:
  The stationary phase method is often employed for computing tunneling {\em
phase} times of analytically-continuous {\em gaussian} or infinite-bandwidth
step pulses which collide with a potential barrier. The indiscriminate
utilization of this method without considering the barrier boundary effects
leads to some misconceptions in the interpretation of the phase times. After
reexamining the above barrier diffusion problem where we notice the wave packet
collision necessarily leads to the possibility of multiple reflected and
transmitted wave packets, we study the phase times for tunneling/reflecting
particles in a framework where an idea of multiple wave packet decomposition is
recovered. To partially overcome the analytical incongruities which rise up
when tunneling phase time expressions are obtained, we present a theoretical
exercise involving a symmetrical collision between two identical wave packets
and a one dimensional squared potential barrier where the scattered wave
packets can be recomposed by summing the amplitudes of simultaneously reflected
and transmitted waves.


title: Beam spin asymmetry in deep and exclusive pi0 electroproduction

abstract:
  The beam spin asymmetry (BSA) in the exclusive reaction ep->ep pi0 was
measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance
Spectrometer(CLAS). The xB, Q2, t and phi dependences of the pi0 BSA are
presented in the deep inelastic regime. The asymmetries are fitted with a
sin(phi) function and their amplitudes are extracted. Overall, they are of the
order of 0.04 - 0.11 and roughly independent of t. This is the signature of a
non-zero longitudinal-transverse interference. The implications concerning the
applicability of a formalism based on generalized parton distributions, as well
as the extension of a Regge formalism at high photon virtualities, are
discussed.


title: Observation of free hole gases at ambient conditions

abstract:
  By studying fluctuations in the electrostatic potential of a single electrode
immersed in a cold plasma, we were able to perform in situ electron
spectroscopy. Electron exchange processes that occur at the surface of the
electrode were triggered by the surface Auger process either using metastable
molecular nitrogen or triplet helium at ambient conditions. Ongoing redox
reactions were decomposed into their two fundamental half reactions and the
reduction and oxidation potentials were detected. We found that redox reactions
near the electrode surface are the result of binary interactions of a free
electron gas with a free hole gas that occur on a femtosecond time scale. The
measured lifetimes of electron-hole recombination processes and the elastic
scattering rate of the hole-hole process are in fair agreement with theoretical
estimates. The observed asymmetry in the energy distributions of free electron
and free hole ensembles suggests that at thermal equilibrium the identity of
hole differs from that of an electron vacancy.


title:
Interpreting the Quantum Wave Function in Terms of 'Interacting
  Faculties'

abstract:
  In this article we discuss the problem of finding an interpretation of
quantum mechanics which provides an objective account of physical reality. In
the first place we discuss the problem of interpretation and analyze the
importance of such an objective account in physics. In this context we present
the problems which arise when interpreting the quantum wave function within the
orthodox formulation of quantum mechanics. In connection to this critic, we
expose the concept of 'entity' as an epistemological obstruction.
  In the second part of this paper we discuss the relation between actuality
and potentiality in classical and quantum physics, and continue to present the
concept of 'ontological potentiality' which is distinguished from the generic
Aristotelian notion of potentiality in terms of 'becoming actual'. In this
paper our main aim is to provide an objective interpretation of quantum
mechanics which allows us to discuss the meaning of physical reality according
to the theory. For this specific propose we present the concept of 'faculty' in
place of the concept of 'entity'. Within our theory of faculties, we continue
to discuss and interpret two paradigmatic experiments of quantum mechanics such
as the double-slit and Schrodinger's cat.


title: Finite Gap Jacobi Matrices: An Announcement

abstract:
  We consider Jacobi matrices whose essential spectrum is a finite union of
closed intervals. We focus on Szego's theorem, Jost solutions, and Szego
asymptotics for this situation. This announcement describes talks the authors
gave at OPSFA 2007.


title: On the depth of invariant rings of infinite groups

abstract:
  Let K be an algebraically closed field. For a finitely generated graded K
algebra R, let cmdef R := dim R - depth R denote the Cohen-Macaulay-defect of
R. Let G be a linear algebraic group over K that is reductive but not linearly
reductive. We show that there exists a faithful rational representation V of G
(which we will give explicitly) such that cmdef K[\sum_i=1^k V]^G >= k-2 for
all k. We give refinements in the case G = SL2.


title: The Jlab Upgrade - Studies of the Nucleon with CLAS12

abstract:
  An overview is presented on the program to study the nucleon structure at the
12 GeV JLab upgrade using the CLAS12 detector. The focus is on deeply virtual
exclusive processes to access the generalized parton distributions,
semni-inclusive processes to study transverse momentum dependent distribution
functions, and inclusive spin structure functions and resonance transition form
factors at high Q^2 and with high precision.


title:
Magnetoelastic and thermal effects in the BiMn2O5 lattice: a
  high-resolution x-ray diffraction study

abstract:
  High-resolution synchrotron x-ray diffraction measurements were performed on
single crystalline and powder samples of BiMn2O5. A linear temperature
dependence of the unit cell volume was found between T_{N}=38$ K and 100 K,
suggesting that a low-energy lattice excitation may be responsible for the
lattice expansion in this temperature range. Between T* ~ 65 K and T_{N}, all
lattice parameters showed incipient magnetoelastic effects, due to short-range
spin correlations. An anisotropic strain along the a-direction was also
observed below T*. Below T_{N}, a relatively large contraction of the
a-parameter following the square of the average sublattice magnetization of Mn
was found, indicating that a second-order spin hamiltonian accounts for the
magnetic interactions along this direction. On the other hand, the more complex
behaviors found for $b$ and $c$ suggest additional magnetic transitions below
T_{N} and perhaps higher-order terms in the spin hamiltonian. Polycrystalline
samples grown by distinct routes and with nearly homogeneous crystal structure
above T_{N} presented structural phase coexistence below T_{N}, indicating a
close competition amongst distinct magnetostructural states in this compound.


title:
Cell-permeable tumor suppressor peptides for cancer therapy: back to the
  future

abstract:
  Miniaturization is a hallmark of modern technologies. Notably, this feature
has not spared molecular biology and its potential applications. Towards
developing more effective therapeutics against cancer, studies began to explore
more than a decade ago how natural tumor suppression could be translated into
antineoplastic drugs. To this end, investigators focused on major constituents
of a central pathway that protects cells against neoplastic transformation: the
nuclear retinoblastoma protein (RB) pathway. As such, peptide mimetics of RB,
p16 and p21 were developed. Likewise, the p53 and von Hippel-Lindau gene
products which affect indirectly the RB pathway provided additional templates
for the development of anti-proliferative peptides. Each of the peptides
derived from these distinct tumor suppressors was made cell-permeable by its
ligation to an amino acid sequence conferring cellular internalization. Details
reviewed here reveal that through the application of such anti-cancer peptide
therapeutics alone or in conjunction whenever synergy is to expect, the dark
era of chemotherapy will likely be overcome, at last.


title: On the question of ferromagnetism in alkali metal thin films

abstract:
  Electronic and magnetic structure of $(100)$ films of K and Cs are calculated
within the plane-wave projector augmented wave (PAW) formalism of the density
functional theory (DFT) using both local spin density approximation (LSDA) and
the PW91 generalized gradient approximation (GGA). Only a 6 layer Cs film is
found to have a ferromagnetic (FM) state which is degenerate with a
paramagnetic (PM) state within the accuracy of these calculations. This is at
variance with the results obtained from a finite thickness uniform jellium
model (UJM). Implications of these results for the experiments on transition
metal doped alkali metal thin films and bulk hosts are discussed.


title: Networking Behavior in Thin Film and Nanostructure Growth Dynamics

abstract:
  Thin film coatings have been essential in development of several micro and
nano-scale devices. To realize thin film coatings various deposition techniques
are employed, each yielding surface morphologies with different characteristics
of interest. Therefore, understanding and control of the surface growth is of
great interest. In this paper, we devise a novel network-based modeling of the
growth dynamics of such thin films and nano-structures. We specifically map
dynamic steps taking place during the growth to components (e.g., nodes, links)
of a corresponding network. We present initial results showing that this
network-based modeling approach to the growth dynamics can simplify our
understanding of the fundamental physical dynamics such as shadowing and
re-emission effects.


title: Electron interactions in an antidot in the integer quantum Hall regime

abstract:
  A quantum antidot, a submicron depletion region in a two-dimensional electron
system, has been actively studied in the past two decades, providing a powerful
tool for understanding quantum Hall systems. In a perpendicular magnetic field,
electrons form bound states around the antidot. Aharonov-Bohm resonances
through such bound states have been experimentally studied, showing interesting
phenomena such as Coulomb charging, h/2e oscillations, spectator modes,
signatures of electron interactions in the line shape, Kondo effect, etc. None
of them can be explained by a simple noninteracting electron approach.
Theoretical models for the above observations have been developed recently,
such as a capacitive-interaction model for explaining the h/2e oscillations and
the Kondo effect, numerical prediction of a hole maximum-density-droplet
antidot ground state, and spin density-functional theory for investigating the
compressibility of antidot edges. In this review, we summarize such
experimental and theoretical works on electron interactions in antidots.


title: Investigating AdS/QCD duality through scalar glueball correlators

abstract:
  We investigate AdS/QCD duality for the two-point correlation function of the
lowest dimension scalar glueball operator, in the case of the IR soft wall
model. We point out the role of the boundary conditions for the
bulk-to-boundary propagator in determining the gluon condensates. We show that
a low energy QCD theorem can be obtained within the AdS approach, together with
a gluon condensate close to the commonly accepted value and robust against
perturbation of the background dilaton field.


title: Rho-Like Mesons from Analysis of the Pion-Pion Scattering

abstract:
  Considering analyticity, unitarity and an influence of coupled channels,
experimental data on the isovector P-wave of pion-pion scattering was analyzed
to study rho-like mesons below 1900 MeV. The analysis indicates evidently that
in the energy range 1200--1800 MeV, there are three rho-like mesons: rho(1250),
rho(1450) and rho(1600), unlike the PDG tables. The obtained P-wave pion-pion
scattering length (a_1^1=33.9+- 2.02 [10^{-3}m_{pi^+}^{-3}]) most matches to
the one calculated in the local Nambu--Jona-Lasinio model.


title: A Note on 3-quasi-Sasakian Geometry

abstract:
  3-quasi-Sasakian manifolds were recently studied by the authors as a suitable
setting unifying 3-Sasakian and 3-cosymplectic geometries. In this paper some
geometric properties of this class of almost 3-contact metric manifolds are
briefly reviewed, with an emphasis on those more related to physical
applications.


title:
Microlensing search for extrasolar planets: observational strategy,
  discoveries and implications

abstract:
  Microlensing has proven to be a valuable tool to search for extrasolar
planets of Jovian- to Super-Earth-mass planets at orbits of a few AU. Since
planetary signals are of very short duration, an intense and continuous
monitoring is required. This is achieved by ground-based networks of telescopes
(PLANET/RoboNET, microFUN) following up targets, which are identified as
microlensing events by single dedicated telescopes (OGLE, MOA). Microlensing
has led to four already published detections of extrasolar planets, one of them
being OGLE-2005-BLG-390Lb, a planet of only ~5.5 M_earth orbiting its M-dwarf
host star at ~2.6 AU. Very recent observations (May--September 2007) provided
more planetary candidates, still under study, that will double the number of
detections. For non-planetary microlensing events observed from 1995 to 2006 we
compute detection efficiency diagrams, which can then be used to derive an
estimate of the Galactic abundance of cool planets in the mass regime from
Jupiters to Sub-Neptunes.


title:
Gamow-Teller strength distributions for double-beta-decaying nuclei
  within continuum-QRPA

abstract:
  A version of the pn-continuum-QRPA is outlined and applied to describe the
Gamow-Teller strength distributions for $\beta\beta$-decaying open-shell
nuclei. The calculation results obtained for the pairs of nuclei $^{116}$Cd-Sn
and $^{130}$Te-Xe are compared with available experimental data.


title:
Causal Relationships between Eruptive Prominences and Coronal Mass
  Ejections

abstract:
  A close association between eruptive prominences and CMEs, both slow and fast
CMEs, was reported in many studies. Sometimes it is possible to follow the
material motion starting from the prominence (filament) activation to the CME
in the high corona. Remnants of the prominence were found in the bright core of
CMEs. However, detailed comparisons of the two phenomena reveal problems in
explaining CMEs as a continuation of filament eruptions in the upper corona.
For example, the heliolatitudes of the disappeared filaments and subsequent
coronal ejections sometimes differ by tens of degrees. In order to clear up the
problems of EP-CME association we tentatively analyse the more general question
of the dynamics of a magnetic flux rope. Prominences and filaments are the best
tracers of the flux ropes in the corona long before the beginning of the
eruption. A twisted flux rope is held by the tension of field lines of
photospheric sources until parameters of the system reach critical values and a
catastrophe happens. We suggest that the associated flux rope height above the
photosphere is one of these parameters and it is revealed by the height of the
filament. 80 filaments were analysed and we found that eruptive prominences
were near the so-called limit of stability a few days before their eruptions.
We suggest that a comparison of the real heights of prominences with the
calculated critical heights from magnetograms could be systematically used to
predict filament eruptions and the corresponding CMEs.


title: Blowup of Jang's equation at outermost marginally trapped surfaces

abstract:
  The aim of this paper is to collect some facts about the blowup of Jang's
equation. First, we discuss how to construct solutions that blow up at an
outermost MOTS. Second, we exclude the possibility that there are extra blowup
surfaces in data sets with non-positive mean curvature. Then we investigate the
rate of convergence of the blowup to a cylinder near a strictly stable MOTS and
show exponential convergence near a strictly stable MOTS.


title: Disentangling the Unparticles with polarized beams at e+e- colliders

abstract:
  Recently proposed idea of unparticles arising due to a scale invariant sector
in the theory can give rise to effective operators with different Lorentz
structures. We show that by using the different polarization options at the
future linear e+e- colliders, the nature of these effective operators can be
easily understood. The unique feature of a complex phase in the propagator of
the unparticle can also be understood uniquely for the different spins by
exploiting the initial beam polarizations at the International Linear Collider
(ILC).


title:
Band structure related wave function symmetry of amphoteric Si dopants
  in GaAs

abstract:
  Autocompensated Si-doped GaAs is studied with cross-sectional scanning
tunneling spectroscopy (X-STS). The local electronic contrasts of
substitutional Si(Ga) donors and Si(As) acceptors under the (110) cleavage
plane are imaged with high resolution. Si(Ga) donor atoms exhibit radially
symmetric contrasts. Si(As) acceptors have anisotropic features. The
anisotropic acceptor contrasts are traced back to a tunnel process at the
valence band edge. They reflect the probability density distribution of the
localized acceptor hole state.


title: Recent issues in open and hidden charm spectroscopy

abstract:
  I present a brief review of results obtained both in open and hidden charm
spectroscopy, discussing the interpretation of $D_{sJ}(2860)$, $D_{sJ}(2700)$
and X(3872).


title: The cool supergiant population of the massive young star cluster RSGC1

abstract:
  We present new high-resolution near-IR spectroscopy and OH maser observations
to investigate the population of cool luminous stars of the young massive
Galactic cluster RSGC1. Using the 2.293\micron CO-bandhead feature, we make
high-precision radial velocity measurements of 16 of the 17 candidate Red
Supergiants (RSGs) identified by Figer et al. We show that F16 and F17 are
foreground stars, while we confirm that the rest are indeed
physically-associated RSGs. We determine that Star F15, also associated with
the cluster, is a Yellow Hypergiant based on its luminosity and spectroscopic
similarity to $\rho$ Cas. Using the cluster's radial velocity, we have derived
the kinematic distance to the cluster and revisited the stars' temperatures and
luminosities. We find a larger spread of luminosities than in the discovery
paper, consistent with a cluster age 30% older than previously thought
(12$\pm$2Myr), and a total initial mass of $(3\pm1) \times 10^{4}$\msun. The
spatial coincidence of the OH maser with F13, combined with similar radial
velocities, is compelling evidence that the two are related. Combining our
results with recent SiO and H$_2$O maser observations, we find that those stars
with maser emission are the most luminous in the cluster. From this we suggest
that the maser-active phase is associated with the end of the RSG stage, when
the luminosity-mass ratios are at their highest.


title:
Generalized Galitskii approach for the vertex function of a Fermi gas
  with resonant interaction

abstract:
  We present a generalized Galitskii approach for the Bethe-Salpeter equation
for the two-particle vertex function of a Fermi system with resonant
interaction by accounting for the resonant state in the scattering potential
and utilizing the universal form of the resonant scattering amplitude. The
procedure can be carried out both for the normal as well as for the condensate
state. In both cases, the vertex function in the vicinity of the resonance is
shown to formally coincide with that obtained for a weakly attractive Fermi
gas. Thus we justify the popular calculational framework in which results for
the weakly attractive Fermi gas are formally extrapolated into the domain of
strong coupling, and further to the repulsive side of the resonance, where
molecular states are formed.


title: Copeland Voting Fully Resists Constructive Control

abstract:
  Control and bribery are settings in which an external agent seeks to
influence the outcome of an election. Faliszewski et al. [FHHR07] proved that
Llull voting (which is here denoted by Copeland^1) and a variant (here denoted
by Copeland^0) of Copeland voting are computationally resistant to many, yet
not all, types of constructive control and that they also provide broad
resistance to bribery. We study a parameterized version of Copeland voting,
denoted by Copeland^alpha where the parameter alpha is a rational number
between 0 and 1 that specifies how ties are valued in the pairwise comparisons
of candidates in Copeland elections. We establish resistance or vulnerability
results, in every previously studied control scenario, for Copeland^alpha, for
each rational alpha, 0 <alpha < 1. In particular, we prove that Copeland^0.5,
the system commonly referred to as ``Copeland voting,'' provides full
resistance to constructive control. Among the systems with a polynomial-time
winner problem, this is the first natural election system proven to have full
resistance to constructive control. Results on bribery and fixed-parameter
tractability of bounded-case control proven for Copeland^0 and Copeland^1 in
[FHHR07] are extended to Copeland^alpha for each rational alpha, 0 < alpha < 1;
we also give results in more flexible models such as microbribery and extended
control.


title:
VLTI/MIDI Observations of the Massive Protostellar Candidate NGC 3603
  IRS 9A

abstract:
  We used MIDI, the mid-infrared interferometric instrument of the VLTI, to
observe the massive protostellar candidate IRS 9A, located at a distance of
about 7 kpc at the periphery of the NGC 3603 star cluster. Our ongoing analysis
shows that MIDI almost fully resolves the object on all observed baselines, yet
below 9 $\mu$m we detect a steep rise of the visibility. This feature is
modelled as a combination of a compact hot component and a resolved warm
envelope which lowers the correlated flux at longer wavelengths. The extended
envelope can already be seen in both MIDI's acquisition images and in
complementary data from aperture masking observations at the Gemini South
telescope. Its shape is asymmetric, which could indicate a circumstellar disk
inclined against the line of sight. The compact component is possibly related
to the inner edge of this (accretion) disk. The uncorrelated mid-infrared
spectrum appears featureless and could be caused by optically thick emission
without a significant contribution from the disk atmosphere.


title:
Path-Integral Renormalization Group Treatments for Many-Electron Systems
  with Long-Range Repulsive Interactions

abstract:
  A practical algorithm for many-electron systems based on the path-integral
renormalization group (PIRG) method is proposed in the real-space
finite-difference (RSFD) approach. The PIRG method, developed for investigating
strongly correlated electron systems, has been successfully applied to some
models such as Hubbard models. However, to apply this method to more realistic
systems of electrons with long-range Coulomb interactions within the RSFD
formalism, the one-body Green's function, which requires large computational
resources, is to be replaced with an alternative. For the same reason, an
efficient algorithm for computing the Fock matrix is needed. The newly proposed
algorithm is free of the one-body Green's function and enables us to compute
the Fock matrix efficiently. Our result shows a significant reduction in CPU
time and the possibility of using the present algorithm as a practical
numerical tool.


title: Power series solution of the modified KdV equation

abstract:
  We prove local-wellposedness of the mKdV equation in $\mathcal{F}L^{s,p}$
spaces using the new method of M. Christ.


title: Calculation of the Two-body T-matrix in Configuration Space

abstract:
  A spectral integral method (IEM) for solving the two-body Schroedinger
equation in configuration space is generalized to the calculation of the
corresponding T-matrix. It is found that the desirable features of the IEM,
such as the economy of mesh-points for a given required accuracy, are carried
over also to the solution of the T-matrix. However the algorithm is
considerably more complex, because the T-matrix is a function of two variables
r and r', rather than only one variable r, and has a slope discontinuity at
r=r'. For a simple exponential potential an accuracy of 7 significant figures
is achieved, with the number N of Chebyshev support points in each partition
equal to 17. For a potential with a large repulsive core, such as the potential
between two He atoms, the accuracy decreases to 4 significant figures, but is
restored to 7 if N is increased to 65.


title:
Description of the spin structure function g_1 at arbitrary $x$ and
  arbitrary Q^2

abstract:
  The explicit expressions describing the structure function g_1 at arbitrary x
and Q^2 are obtained. In the first place, they combine the well-known DGLAP
expressions for g_1 with the total resummation of leading logarithms of x,
which makes possible to cover the kinematic region of arbitrary x and large
Q^2. In order to cover the small-Q^2 region the shift Q^2 -> Q^2 + mu^2 in the
large-Q^2 expressions for g_1 is suggested and values of mu are estimated. The
expressions obtained do not require singular factors x^{-a} in the fits for
initial parton densities.


title:
The underscreened Kondo lattice model applied to heavy fermion uranium
  compounds

abstract:
  We present theoretical results for the underscreened Kondo lattice model with
localized S=1 spins coupled to a conduction band through a Kondo coupling,
$J_K$, and interacting among them ferromagnetically. We use a fermionic
representation for the spin operators and expand the Hamiltonian in terms of
bosonic fields. For large values of $J_K$, we obtain a ferromagnetically
ordered solution and a Kondo regime with a Kondo temperature, $T_K$, larger
than the Curie temperature, $T_C$. This finding suggests a scenario for a
coexistence of Kondo effect and ferromagnetic order. In some uranium compounds,
like $UTe$ or $UCu_{0.9}Sb_{2}$, this kind of coexistence has been
experimentally observed: they order ferromagnetically with a Curie temperature
of order $T_C \sim 100K$ and exhibit a Kondo behavior for $T > T_C$. The
proposed underscreened Kondo lattice model accounts well for the coexistence
between magnetic order and Kondo behavior and yields to a new ``ferromagnetic
Doniach diagram''.


title: On a space related to the affine building of type E7

abstract:
  A locally truncated geometry with diagram of type affine E7 is studied. One
considers a parapolar space, locally of type A_{7,4}, which is subject to an
extra axiom. A covering of this space is constructed; it is proved that this
covering space is a rank 6, residually connected, locally truncated diagram
geometry which is a homomorphic image of a truncated building of affine type
E7. Consequently, the initial parapolar space is also a homomorphic image of a
truncated building.


title:
Observation of negative-frequency waves in a water tank: A classical
  analogue to the Hawking effect?

abstract:
  The conversion of positive-frequency waves into negative-frequency waves at
the event horizon is the mechanism at the heart of the Hawking radiation of
black holes. In black-hole analogues, horizons are formed for waves propagating
in a medium against the current when and where the flow exceeds the wave
velocity. We report on the first direct observation of negative-frequency waves
converted from positive-frequency waves in a moving medium. The measured degree
of mode conversion is significantly higher than expected from theory.


title: Tongue Liminary Threshold Identification to Electrotactile Stimulation

abstract:
  Many applications use electrostimulation of the human skin to provide tactile
sensation. The effect of electrotactile stimulations were studied on a 6x6
matrix of tactile electrodes placed on the anterior part of the tongue. The
liminary threshold with continuous or discontinuous waveform and patterns with
2 or 4 electrodes was investigated. The result suggest that for energy saving
and to improve the yield, it would probably be better to use discontinuous
stimulation with two electrode patterns.


title: D and Ds hadronic branching fractions at B factories

abstract:
  Recent measurements of hadronic branching fractions of D and Ds mesons,
performed by the BaBar and Belle experiments at the asymmetric e+e- B factories
colliders PEP II and KEKB, are reviewed.


title: Exponential complexity and ontological theories of quantum mechanics

abstract:
  Ontological theories of quantum mechanics describe a single system by means
of well-defined classical variables and attribute the quantum uncertainties to
our ignorance about the underlying reality represented by these variables. We
consider the general class of ontological theories describing a quantum system
by a set of variables with Markovian (either deterministic or stochastic)
evolution. We provide the first proof that the number of continuous variables
can not be smaller than 2N-2, N being the Hilbert space dimension. Thus, any
ontological Markovian theory of quantum mechanics requires a number of
variables which grows exponentially with the physical size. This result is
relevant also in the framework of quantum Monte Carlo methods.


title:
Sequestered uplifting and the pattern of soft supersymmetry breaking
  terms

abstract:
  We examine the pattern of soft supersymmetry breaking terms in moduli
stabilization, where an uplifting potential is provided by spontaneously broken
supersymmetry in a generic sequestered sector. From stationary conditions, we
derive the relation between moduli F-term vacuum expectation values which does
not depend on the details of sequestered uplifting. This moduli F-term relation
is crucial for identifying the dominant source of soft terms of visible fields.


title: Modeling an accretion disc stochastical variability

abstract:
  Hot spots residing on the surface of an accretion disc have been considered
as a model of short-term variability of active galactic nuclei. In this paper
we apply the theory of random point processes to model the observed signal from
an ensemble of randomly generated spots. The influence of general relativistic
effects near a black hole is taken into account and it is shown that typical
features of power spectral density can be reproduced. Connection among spots is
also discussed in terms of Hawkes' process, which produces more power at low
frequencies. We derive a semi-analytical way to approximate the resulting
power-spectral density.


title:
The polyhedral nature of LINERs: An XMM-Newton view of LINERs in radio
  galaxies

abstract:
  Aims: We investigate the origin of X-rays and the nature of accretion flow in
4 LINERs hosted by radio galaxies, namely NGC1692, PKS0625-35, 3C88, 3C444,
recently observed with XMM. Methods: We combine the results from the
time-averaged spectral analysis with model-independent information from X-ray
temporal and spectral variability analyses, and with additional broadband
information (UV and radio). Results: The values of the Eddington ratios of our
sample span 2 orders of magnitude. The 4 AGN are adequately fitted by the same
continuum model that comprises at least one thermal component and a partially
absorbed power law, whose relative contribution and photon index vary
substantially from source to source. NGC1692 and PKS0625-35 have fairly steep
power-law components, perhaps indicative of synchrotron emission from a jet.
Conversely, the flat photon index derived for 3C88 may be indicative of a
heavily absorbed object. Finally, the time-averaged spectral properties of
3C444 (Gamma~1.9 and an apparent line-like excess around 6.7 keV) are more in
line with Seyfert galaxies. The temporal analysis reveals that PKS0625-35 and
3C88 are significantly variable in the soft energy band. PKS0625-35 also shows
suggestive evidence of spectral variability on timescales of months. The main
findings from the broadband analysis can be summarized as follows: 1) 3C444,
PKS0625-35, and NGC1692 have alpha_OX values consistent with the well known
alpha_OX -l_UV correlation. 2) No positive correlation is found between L_X and
the inclination angle, suggesting that the X-ray emission is not beamed. 3) The
values of the radio-loudness are inversely proportional to the Eddington ratio
and locate our objects in between the ``radio-loud'' and ``radio-quiet''
branches in the R- l_UV plane.


abstract:
  In this paper we prove an analogue of the McKay correspondence for
Landau-Ginzburg models. Our proof is based on the ideas introduced by T.
Bridgeland, A. King and M. Reid, which reformulate and generalize the McKay
correspondence in the language of derived categories, along with the techniques
introduced by J.-C. Chen.


title:
The window at the edge of chaos in a simple model of gene interaction
  networks

abstract:
  As a model for gene and protein interactions we study a set for molecular
catalytic reactions. The model is based on experimentally motivated interaction
network topologies, and is designed to capture some key statistics of gene
expression statistics. We impose a non-linearity to the system by a boundary
condition which guarantees non-negative concentrations of chemical
concentrations and study the system stability quantified by maximum Lyapunov
exponents. We find that the non-negativity constraint leads to a drastic
inflation of those regions in parameter space where the Lyapunov exponent
exactly vanishes. We explain the finding as a self-organized critical
phenomenon. The robustness of this finding with respect to different network
topologies and the role of intrinsic molecular- and external noise is
discussed. We argue that systems with inflated 'edges of chaos' could be much
more easily favored by natural selection than systems where the Lyapunov
exponent vanishes only on a parameter set of measure zero.


title:
Magnetoelectric Effects on Composite Nano Granular $Fe/TiO_{2-\delta}$
  Films

abstract:
  Employing a new experimental technique to measure magnetoelectric response
functions, we have measured the magnetoelectric effect in composite films of
nano granular metallic iron in anatase titanium dioxide at temperatures below
50 K. A magnetoelectric resistance is defined as the ratio of a transverse
voltage to bias current as a function of the magnetic field. In contrast to the
anomalous Hall resistance measured above 50 K, the magnetoelectic resistance
below 50 K is significantly larger and exhibits an even symmetry with respect
to magnetic field reversal $H\to -H$. The measurement technique required
attached electrodes in the plane of the film composite in order to measure
voltage as a function of bias current and external magnetic field. To our
knowledge, the composite films are unique in terms of showing magnetoelectric
effects at low temperatures, $<$ 50 K, and anomalous Hall effects at high
temperatures, $>$ 50 K.


title: A Temperley-Lieb category for 2-manifolds

abstract:
  Guided by consideration of problems in 2 and 3 dimensional lattice model
computation, we are led to define a number of new categories, and functors
between these categories and the partition category, culminating in the
introduction of two categories generalising the Temperley-Lieb category. We
show how to compute practically in these categories, by giving a combinatorial
realisation of their (topological) construction.


title: The WA3 data and the two $K_1(1270)$ resonances

abstract:
  Recent studies based on unitary chiral perturbation theory (U$\chi$PT) found
that the low-lying axial vector mesons can be dynamically generated due to the
interaction of the pseudoscalar octet of the pion and the vector nonet of the
rho. In particular, two poles in the second Riemann sheet have been associated
to the nominal $K_1(1270)$ resonance. In this talk, we present a recent
analysis of the WA3 data on $K^-p\to K^-\pi^+\pi^- p$ at 63 GeV using the
U$\chi$PT amplitudes, and show that it is in favor of the existence of two
$K_1(1270)$'s [Phys. Rev. D 75, 014017 (2007)].


title:
Dark Electric Matter Objects: History of Discovery, Modes of Interaction
  with Matter, Some Inferences and Prospects

abstract:
  Experiments with thin ZnS(Ag) scintillators provide evidence with C.L. >
99.99% for the existence of DArk Electric Matter Objects - daemons (presumably
negatively charged Planckian particles with M ~ 10^-5 g) captured from the
Galactic disk into near-Earth, almost circular heliocentric orbits. Their flux
at V ~ 10-15 km/s was found to be as high as f > 10^-7 cm^-2 s^-1 and vary with
P = 0.5 y, with maxima in March and September. A daemon flux f ~ 10^-7 - 10^-6
cm^-2 s^-1 is capable of accounting for the Troitsk anomaly in the tritium
beta-spectrum and suggests its more pronounced manifestation in future KATRIN
experiment. In view of the channeling effect on iodine recoil nuclei in the
NaI(Tl) crystal, the DAMA/NaI experiment is also apparently detecting a flux of
daemons, f ~ 6x10^-7 cm^-2 s^-1, but in this case of those falling with V =
30-50 km/s from strongly elongated, Earth-crossing heliocentric orbits oriented
in the antapex direction, as a result of which the number of events detected in
the 2-6-keV interval varies with P = 1 y.


title:
Mosaic length and finite interaction-range effects in a one dimensional
  random energy model

abstract:
  In this paper we study finite interaction range corrections to the mosaic
picture of the glass transition as emerges from the study of the Kac limit of
large interaction range for disordered models. To this aim we consider point to
set correlation functions, or overlaps, in a one dimensional random energy
model as a function of the range of interaction. In the Kac limit, the mosaic
length defines a sharp first order transition separating a high overlap phase
from a low overlap one. Correspondingly we find that overlap curves as a
function of the window size and different finite interaction ranges cross
roughly at the mosaic lenght. Nonetheless we find very slow convergence to the
Kac limit and we discuss why this could be a problem for measuring the mosaic
lenght in realistic models.


title: Projective relations for m-th root metric spaces

abstract:
  For Finsler spaces (M,F) endowed with m-th root metrics, we provide necessary
and sufficient conditions in which they are projectively flat, or projectively
related to Berwald/Riemann spaces. We also give a specific characterization for
m-th root metrics spaces of Landsberg and of Berwald type.


title: The Peculiar Type Ib Supernova 2006jc: A WCO Wolf-Rayet Star Explosion

abstract:
  We present a theoretical model for Type Ib supernova (SN) 2006jc. We
calculate the evolution of the progenitor star, hydrodynamics and
nucleosynthesis of the SN explosion, and the SN bolometric light curve (LC).
The synthetic bolometric LC is compared with the observed bolometric LC
constructed by integrating the UV, optical, near-infrared (NIR), and
mid-infrared (MIR) fluxes. The progenitor is assumed to be as massive as
$40M_\odot$ on the zero-age main-sequence. The star undergoes extensive mass
loss to reduce its mass down to as small as $6.9M_\odot$, thus becoming a WCO
Wolf-Rayet star. The WCO star model has a thick carbon-rich layer, in which
amorphous carbon grains can be formed. This could explain the NIR brightening
and the dust feature seen in the MIR spectrum. We suggest that the progenitor
of SN 2006jc is a WCO Wolf-Rayet star having undergone strong mass loss and
such massive stars are the important sites of dust formation. We derive the
parameters of the explosion model in order to reproduce the bolometric LC of SN
2006jc by the radioactive decays: the ejecta mass $4.9M_\odot$, hypernova-like
explosion energy $10^{52}$ ergs, and ejected $^{56}$Ni mass $0.22M_\odot$. We
also calculate the circumstellar interaction and find that a CSM with a flat
density structure is required to reproduce the X-ray LC of SN 2006jc. This
suggests a drastic change of the mass-loss rate and/or the wind velocity that
is consistent with the past luminous blue variable (LBV)-like event.


title: Superintegrable Systems with a Third Order Integrals of Motion

abstract:
  Two-dimensional superintegrable systems with one third order and one lower
order integral of motion are reviewed. The fact that Hamiltonian systems with
higher order integrals of motion are not the same in classical and quantum
mechanics is stressed. New results on the use of classical and quantum third
order integrals are presented in Section 5 and 6.


title: Transport reversal in a delayed feedback ratchet

abstract:
  Feedback flashing ratchets are thermal rectifiers that use information on the
state of the system to operate the switching on and off of a periodic
potential. They can induce directed transport even with symmetric potentials
thanks to the asymmetry of the feedback protocol. We investigate here the
dynamics of a feedback flashing ratchet when the asymmetry of the ratchet
potential and of the feedback protocol favor transport in opposite directions.
The introduction of a time delay in the control strategy allows one to
nontrivially tune the relative relevance of the competing asymmetries leading
to an interesting dynamics. We show that the competition between the
asymmetries leads to a current reversal for large delays. For small ensembles
of particles current reversal appears as the consequence of the emergence of an
open-loop like dynamical regime, while for large ensembles of particles it can
be understood as a consequence of the stabilization of quasiperiodic solutions.
We also comment on the experimental feasibility of these feedback ratchets and
their potential applications.


title:
Deuteron form factors in chiral effective theory: regulator-independent
  results and the role of two-pion exchange

abstract:
  We evaluate the deuteron charge, quadrupole, and magnetic form factors using
wave functions obtained from chiral effective theory ($\chi$ET) when the
potential includes one-pion exchange, chiral two-pion exchange, and genuine
contact interactions. We study the manner in which the results for form factors
behave as the regulator is removed from the $\chi$ET calculation, and compare
co-ordinate- and momentum-space approaches. We show that, for both the LO and
NNLO chiral potential, results obtained by imposing boundary conditions in
co-ordinate space at $r=0$ are equivalent to the $\Lambda \to \infty$ limit of
momentum-space calculations. The regulator-independent predictions for deuteron
form factors that result from taking the $\Lambda \to \infty$ limit using the
LO $\chi$ET potential are in reasonable agreement with data up to momentum
transfers of order 600 MeV, provided that phenomenological information for
nucleon structure is employed. In this range the use of the NNLO $\chi$ET
potential results in only small changes to the LO predictions, and it improves
the description of the zero of the charge form factor.


title:
Discovery of exceptional points in the Bose-Einstein condensation of
  gases with attractive 1/r-interaction

abstract:
  The extended Gross-Pitaevskii equation for the Bose-Einstein condensation of
gases with attractive 1/r-interaction has a second solution which is born
together with the ground state in a tangent bifurcation. At the bifurcation
point both states coalesce, i.e., the energies and the wave functions are
identical. We investigate the bifurcation point in the context of exceptional
points, a phenomenon known for linear non-Hermitian Hamiltonians. We point out
that the mean field energy, the chemical potential, and the wave functions show
the same behavior as an exceptional point in a linear, non-symmetric system.
The analysis of the analytically continued Gross-Pitaevskii equation reveals
complex waves at negative scattering lengths below the tangent bifurcation.
These solutions are interpreted as a decay of the condensate caused by an
absorbing potential.


title: Torsion and Supersymmetry Breaking

abstract:
  We identify the auxiliary fields in the hypermultiplets of type IIB string
theory compactified on a Calabi-Yau manifold, using a combination of worldsheet
and supergravity techniques. The SUSY-breaking squark and gaugino masses in
type IIB models depend on these auxiliary fields, which parametrize
deformations away from a pure Calabi-Yau compactification to one with NS-NS
3-form flux and SU(3) x SU(3) structure. Worldsheet arguments show that such
compactifications are generically globally nongeometric. Our results, combined
with earlier results for type IIA compactifications, imply that these
deformations are the mirrors of NS-NS 3-form flux, in accord with work from the
supergravity point of view. Using the worldsheet current algebra, we explain
why mirror symmetry may continue to hold in the presence of fluxes breaking the
symmetries (e.g., (2,2) SUSY) on which mirror symmetry is typically taken to
depend. Finally, we give evidence that nonperturbative worldsheet effects (such
as worldsheet instantons) provide important corrections to the supergravity
picture in the presence of auxiliary fields for Kahler moduli.


title:
Close-packed dimers on the kagome lattice: Finite lattices and the
  Grassmannian approach

abstract:
  In a recent paper [ F. Wang and F. Y. Wu, Phys. Rev. E 75 (2007) 040105(R) ]
we reported exact results on the enumeration of close-packed dimers on an
infinite kagome lattice. We computed the per-dimer free energy using both the
Pfaffian approach and a vertex-model formulation, and found the result given by
a simple expression. We also reported results on dimer-dimer correlations
without giving details. In this paper we present details of the correlation
function analysis. In addition, we extend the exact enumeration to finite
lattices under two different boundary conditions and with asymmetric dimer
weights. For symmetric dimer weights the finite-lattice results are again
simple, and we show that they can be understood using a spin variable mapping.
We also describe the formulation of a Grassmannian functional integral approach
and apply it to the kagome lattice.


title:
Lowest order QED radiative corrections to five-fold differential cross
  section of hadron leptoproduction

abstract:
  The contribution of exclusive radiative tail to the cross section of
semi-inclusive hadron leptoproduction has been calculated exactly for the first
time. Although the experience of inclusive data analyses suggests us that the
contribution of radiative tail from the elastic peak is of particular
importance, similar effects in the semi-inclusive process were only recently
estimated in the peaking approximation. The explicit expressions for the lepton
part of the lowest order QED contribution of exclusive radiative tail to the
five-fold differential cross section are obtained and discussed. Numerical
estimates, provided within Jefferson Lab kinematic conditions, demonstrate
rather large effects of the exclusive radiative tail in the region at
semi-inclusive threshold and for high energy of detected hadron.


title:
Millihertz Oscillation Frequency Drift Predicts the Occurrence of Type I
  X-ray Bursts

abstract:
  Millihertz quasi-periodic oscillations reported in three neutron-star low
mass X-ray binaries have been suggested to be a mode of marginally stable
nuclear burning on the neutron star surface. In this Letter, we show that close
to the transition between the island and the banana state, 4U~1636--53 shows
mHz QPOs whose frequency systematically decreases with time until the
oscillations disappear and a Type I X-ray burst occurs. There is a strong
correlation between the QPO frequency $\nu$ and the occurrence of X-ray bursts:
when $\nu\gtrsim9$ mHz no bursts occur, while $\nu\lesssim9$ mHz does allow the
occurrence of bursts. The mHz QPO frequency constitutes the first identified
observable that can be used to predict the occurrence of X-ray bursts. If a
systematic frequency drift occurs, then a burst happens within a few
kilo-seconds after $\nu$ drops below 9 mHz. This observational result confirms
that the mHz QPO phenomenon is intimately related with the processes that lead
to a thermonuclear burst.


title:
Enhanced high-energy neutrino emission from choked gamma-ray bursts due
  to meson and muon acceleration

abstract:
  It has been suggested that a potentially large fraction of supernovae could
be accompanied by relativistic outflows that stall below the stellar surface.
In this letter we point out that internal shocks that are believed to
accelerate protons to very high energies in these flows will also accelerate
secondary mesons and muons. As a result the neutrino spectrum from meson and
muon decay is expected to be much harder compared to previous estimates,
extending as a single power law up to ~10^3 TeV. This greatly improves the
detection prospects.


title: On the Capacity of a Class of MIMO Cognitive Radios

abstract:
  Cognitive radios have been studied recently as a means to utilize spectrum in
a more efficient manner. This paper focuses on the fundamental limits of
operation of a MIMO cognitive radio network with a single licensed user and a
single cognitive user. The channel setting is equivalent to an interference
channel with degraded message sets (with the cognitive user having access to
the licensed user's message). An achievable region and an outer bound is
derived for such a network setting. It is shown that under certain conditions,
the achievable region is optimal for a portion of the capacity region that
includes sum capacity.


title: Open Cavity Solutions to the rf in Magnetic Field Problem

abstract:
  It has been observed \cite{break} that breakdown in an 805 MHz pill-box cavi
ty occurs at much lower gradients as an external axial magnetic field is inc
reased. This effect was not observed with on open iris cavity. It is propose d
that this effect depends on the relative angles of the magnetic and maximu m
electric fields: parallel in the pill-box case; at an angle in the open ir is
case. If so, using an open iris structure with solenoid coils in the iris es
should perform even better. A lattice, using this principle, is presented, for
use in 6D cooling for a Muon Collider. Experimental layouts to test th is
principle are proposed.


title: Stochastic Acceleration in the Western Hotspot of Pictor A

abstract:
  Chandra's high resolution observations of radio galaxies require a revisit of
the relevant electron acceleration processes. Although the diffusive shock
particle acceleration model may explain spectra of spatially unresolved
sources, it encounters difficulties in explaining the structure and spectral
properties of recently discovered Chandra X-ray features in several low-power
radio sources. We argue that these observations strongly suggest stochastic
electron acceleration by magnetized turbulence, and show that the simplest
stochastic particle acceleration model with energy independent acceleration and
escape timescales can overcome most of these difficulties. We use the bright
core of the western hotspot of Pictor A as an example to demonstrate the model
characteristics, which may be tested with high energy observations.


title: Globular Clusters and Dwarf Spheroidal Galaxies

abstract:
  Traditionally globular clusters and dwarf spheroidal galaxies have been
distinguished by using one or more of the following criteria: (1) mass, (2)
luminosity, (3) size, (4) mass-to-light ratio and (5) spread in metallicity.
However, a few recently discovered objects show some overlap between the
domains in parameter space that are occupied by galaxies and clusters. In the
present note it is shown that ellipticity can, in some cases, be used to help
distinguish between globular clusters and dwarf spheroidal galaxies.


title: Fiber-optical analogue of the event horizon

abstract:
  The physics at the event horizon resembles the behavior of waves in moving
media. Horizons are formed where the local speed of the medium exceeds the wave
velocity. We use ultrashort pulses in microstructured optical fibers to
demonstrate the formation of an artificial event horizon in optics. We observed
a classical optical effect, the blue-shifting of light at a white-hole horizon.
We also show by theoretical calculations that such a system is capable of
probing the quantum effects of horizons, in particular Hawking radiation.