title: Landau Gauge QCD: Functional Methods versus Lattice Simulations

abstract:
  The infrared behaviour of QCD Green's functions in Landau gauge has been
focus of intense study. Different non-perturbative approaches lead to a
prediction in line with the conditions for confinement in local quantum field
theory as spelled out in the Kugo-Ojima criterion. Detailed comparisons with
lattice studies have revealed small but significant differences, however. But
aren't we comparing apples with oranges when contrasting lattice Landau gauge
simulations with these continuum results? The answer is yes, and we need to
change that. We therefore propose a reformulation of Landau gauge on the
lattice which will allow us to perform gauge-fixed Monte-Carlo simulations
matching the continuum methods of local field theory which will thereby be
elevated to a non-perturbative level at the same time.


title:
Global dimensions of endomorphism algebras for generator-cogenerators
  over $m$-replicated algebras

abstract:
  Let $A$ be a hereditary artin algebra and $A^{(m)}$ be the $m$-replicated
algebra of $A$. We investigate the possibilities for the global dimensions of
the endomorphism algebras of generator-cogenerators over $A^{(m)}$.


title: Black Boxes

abstract:
  We introduce Black Boxes, the intention being provably in ZFC, we have
guesses of extra structure. The guesses are pairwise quite far but together are
"dense". We first deal with the simplest case, were the existence comes from
winning a game by just writing down the opponent's moves. We show how it helps
when instead orders we have tress with boundedly many levels, having freedom in
the last. After this we quite systematically look at existence of black boxes,
and make connection to non-saturation of natural ideals and diamonds on them.
  Chapter IV of upcoming book "Nonstructure Theory".


title: Askey--Wilson polynomials, quadratic harnesses and martingales

abstract:
  We use orthogonality measures of Askey--Wilson polynomials to construct
Markov processes with linear regressions and quadratic conditional variances.
Askey--Wilson polynomials are orthogonal martingale polynomials for these
processes.


title: Di-neutron correlation in light neutron-rich nuclei

abstract:
  Using a three-body model with density-dependent contact interaction, we
discuss the root mean square distance between the two valence neutrons in
$^{11}$Li nuclues as a function of the center of mass of the neutrons relative
to the core nucleus $^9$Li. We show that the mean distance takes a pronounced
minimum around the surface of the nucleus, indicating a strong surface
di-neutron correlation. We demonstrate that the pairing correlation plays an
essential role in this behavior. We also discuss the di-neutron structure in
the $^8$He nucleus.


title: Probabilistic reasoning with answer sets

abstract:
  This paper develops a declarative language, P-log, that combines logical and
probabilistic arguments in its reasoning. Answer Set Prolog is used as the
logical foundation, while causal Bayes nets serve as a probabilistic
foundation. We give several non-trivial examples and illustrate the use of
P-log for knowledge representation and updating of knowledge. We argue that our
approach to updates is more appealing than existing approaches. We give
sufficiency conditions for the coherency of P-log programs and show that Bayes
nets can be easily mapped to coherent P-log programs.


title:
$f(R)$ gravity theories in the Palatini Formalism constrained from
  strong lensing

abstract:
  $f(R)$ gravity, capable of driving the late-time acceleration of the
universe, is emerging as a promising alternative to dark energy. Various $f(R)$
gravity models have been intensively tested against probes of the expansion
history, including type Ia supernovae (SNIa), the cosmic microwave background
(CMB) and baryon acoustic oscillations (BAO). In this paper we propose to use
the statistical lens sample from Sloan Digital Sky Survey Quasar Lens Search
Data Release 3 (SQLS DR3) to constrain $f(R)$ gravity models. This sample can
probe the expansion history up to $z\sim2.2$, higher than what probed by
current SNIa and BAO data. We adopt a typical parameterization of the form
$f(R)=R-\alpha H^2_0(-\frac{R}{H^2_0})^\beta$ with $\alpha$ and $\beta$
constants. For $\beta=0$ ($\Lambda$CDM), we obtain the best-fit value of the
parameter $\alpha=-4.193$, for which the 95% confidence interval that is
[-4.633, -3.754]. This best-fit value of $\alpha$ corresponds to the matter
density parameter $\Omega_{m0}=0.301$, consistent with constraints from other
probes. Allowing $\beta$ to be free, the best-fit parameters are $(\alpha,
\beta)=(-3.777, 0.06195)$. Consequently, we give $\Omega_{m0}=0.285$ and the
deceleration parameter $q_0=-0.544$. At the 95% confidence level, $\alpha$ and
$\beta$ are constrained to [-4.67, -2.89] and [-0.078, 0.202] respectively.
Clearly, given the currently limited sample size, we can only constrain $\beta$
within the accuracy of $\Delta\beta\sim 0.1$ and thus can not distinguish
between $\Lambda$CDM and $f(R)$ gravity with high significance, and actually,
the former lies in the 68% confidence contour. We expect that the extension of
the SQLS DR3 lens sample to the SDSS DR5 and SDSS-II will make constraints on
the model more stringent.


title:
Novel properties in Josephson junctions involving the
  cos(kx)cos(ky)-pairing state in iron-pnictides

abstract:
  We propose a trilayer $\pi$-junction that takes advantage of the
unconventional $s_{x^2 y^2}=\cos k_x \cos k_y$ pairing symmetry which changes
sign between electron and hole Fermi pockets in the iron pnictides. In
addition, we also present theoretical results for Andreev bound states in thin
superconductor-normal metal (or insulator) iron-pnictide junctions. The
presence of nontrivial in-gap states, which uniquely appear in this
unconventional pairing state, is a distinct feature in comparison to other
singlet pairing states.


title: Dissipative Solitary Waves in Granular Crystals

abstract:
  We provide a quantitative characterization of dissipative effects in
one-dimensional granular crystals. We use the propagation of highly nonlinear
solitary waves as a diagnostic tool and develop optimization schemes that allow
one to compute the relevant exponents and prefactors of the dissipative terms
in the equations of motion. We thereby propose a quantitatively-accurate
extension of the Hertzian model that encompasses dissipative effects via a
discrete Laplacian of the velocities. Experiments and computations with steel,
brass, and polytetrafluoroethylene reveal a {\em common} dissipation exponent
with a material-dependent prefactor.


title:
Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by
  angle-resolved photoemission spectroscopy

abstract:
  We have performed high-resolution angle-resolved photoemission spectroscopy
on the optimally-doped Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ compound and determined
the accurate momentum dependence of the superconducting (SC) gap in four
Fermi-surface sheets including a newly discovered outer electron pocket at the
M point. The SC gap on this pocket is nearly isotropic and its magnitude is
comparable ($\Delta$ $\sim$ 11 meV) to that of the inner electron and hole
pockets ($\sim$12 meV), although it is substantially larger than that of the
outer hole pocket ($\sim$6 meV). The Fermi-surface dependence of the SC gap
value is basically consistent with $\Delta$($k$) = $\Delta$$_0$cos$k_x$cos$k_y$
formula expected for the extended s-wave symmetry. The observed finite
deviation from the simple formula suggests the importance of multi-orbital
effects.


title:
Revisiting 2x2 matrix optics: Complex vectors, Fermion combinatorics,
  and Lagrange invariants

abstract:
  We propose that the height-angle ray vector in matrix optics should be
complex, based on a geometric algebra analysis. We also propose that the ray's
2x2 matrix operators should be right-acting, so that the matrix product
succession would go with light's left-to-right propagation. We express the
propagation and refraction operators as a sum of a unit matrix and an imaginary
matrix proportional to the Fermion creation or annihilation matrix. In this
way, we reduce the products of matrix operators into sums of
creation-annihilation product combinations. We classify ABCD optical systems
into four: telescopic, inverse Fourier transforming, Fourier transforming, and
imaging. We show that each of these systems have a corresponding Lagrange
theorem expressed in partial derivatives, and that only the telescopic and
imaging systems have Lagrange invariants.


title: Kazhdan's Property T for Discrete Quantum Groups

abstract:
  We give a simple definition of property T for discrete quantum groups. We
prove the basic expected properties: discrete quantum groups with property T
are finitely generated and unimodular. Moreover we show that, for "I.C.C."
discrete quantum groups, property T is equivalent to Connes' property T for the
dual von Neumann algebra. This allows us to give the first example of a
property T discrete quantum group which is not a group using the twisting
construction.


title:
A pseudo active kinematic constraint for a biological living soft
  tissue: an effect of the collagen network

abstract:
  Recent studies in mammalian hearts show that left ventricular wall thickening
is an important mechanism for systolic ejection and that during contraction the
cardiac muscle develops significant stresses in the muscular cross-fiber
direction. We suggested that the collagen network surrounding the muscular
fibers could account for these mechanical behaviors. To test this hypothesis we
develop a model for large deformation response of active, incompressible,
nonlinear elastic and transversely isotropic living soft tissue (such as
cardiac or arteries tissues) in which we include a coupling effect between the
connective tissue and the muscular fibers. Then, a three-dimensional finite
element formulation including this internal pseudo-active kinematic constraint
is derived. Analytical and finite element solutions are in a very good
agreement. The numerical results show this wall thickening effect with an order
of magnitude compatible with the experimental observations.

categories: math.AP physics.class-ph physics.med-ph q-bio.TO


title: Periodicities of T-systems and Y-systems

abstract:
  The unrestricted T-system is a family of relations in the Grothendieck ring
of the category of the finite-dimensional modules of the Yangian or the quantum
affine algebra associated with a complex simple Lie algebra. The unrestricted
T-system admits a reduction called the restricted T-system. In this paper we
formulate the periodicity conjecture for the restricted T-systems, which is the
counterpart of the known and partially proved periodicity conjecture for the
restricted Y-systems. Then, we partially prove the conjecture by various
methods: the cluster algebra and cluster category method for the simply laced
case, the determinant method for types A and C, and the direct method for types
A, D, and B (level 2).


title: Strong laser fields as a probe for fundamental physics

abstract:
  Upcoming high-intensity laser systems will be able to probe the
quantum-induced nonlinear regime of electrodynamics. So far unobserved QED
phenomena such as the discovery of a nonlinear response of the quantum vacuum
to macroscopic electromagnetic fields can become accessible. In addition, such
laser systems provide for a flexible tool for investigating fundamental
physics. Primary goals consist in verifying so far unobserved QED phenomena.
Moreover, strong-field experiments can search for new light but weakly
interacting degrees of freedom and are thus complementary to accelerator-driven
experiments. I review recent developments in this field, focusing on photon
experiments in strong electromagnetic fields. The interaction of
particle-physics candidates with photons and external fields can be
parameterized by low-energy effective actions and typically predict
characteristic optical signatures. I perform first estimates of the accessible
new-physics parameter space of high-intensity laser facilities such as POLARIS
and ELI.


title: Scalar tetraquarks with open bottom

abstract:
  The relativistic four-quark equations in the framework of the dispersion
relation technique are derived. The four-quark amplitudes of the scalar
tetraquarks with open bottom, including u, d, s and bottom quarks, are
constructed. The poles of these amplitudes determine the masses and widths of
scalar tetraquarks.


title: Pattern Speed of Lopsidedness in Galactic Disks

abstract:
  The disks of spiral galaxies commonly show a lopsided mass distribution, with
a typical fractional amplitude of 10 % for the Fourier component m=1. This is
seen in both stars and gas, and the amplitude is higher by a factor of two for
galaxies in a group. The study of lopsidedness is a new topic, in contrast to
the extensively studied bars and two-armed spirals (m=2). Here, first a brief
overview of the observations of disk lopsidedness is given, followed by a
summary of the various mechanisms that have been proposed to explain its
physical origin. These include tidal interactions, gas accretion, and a global
instability. The pattern speed of lopsidedness in a real galaxy has not been
measured so far, the various issues involved will be discussed. Theoretical
studies have shown that the m=1 slow modes are long-lived, while the modes with
a moderate pattern speed as triggered in interactions, last for only about a
Gyr. Thus a measurement of the pattern speed of lopsided distribution will help
identify the mechanism for its origin.


title:
Relationship between the magnetic hyperfine field and the magnetic
  moment

abstract:
  Based on experimental data it is shown, for some chosen alloys and compounds
of iron, that there is no one unique relationship between the 57Fe-site
magnetic hyperfine field, Bhf, and the magnetic moment per Fe atom, m. Instead,
the Bhf-m plot consists of several branches, each of them being characteristic
of a given alloy or compound. Consequently, the effective proportionality
constant (hyperfine coupling constant) depends on the alloy system or compound,
and for a given alloy system or compound it depends on the composition or even
on the lattice site. Consequently, the scaling of Bhf into the underlying m
cannot be done a priopri.


title: Group actions on geodesic Ptolemy spaces

abstract:
  In this paper we study geodesic Ptolemy metric spaces $X$ which allow proper
and cocompact isometric actions of crystallographic or, more generally, virtual
polycyclic groups. We show that $X$ is equivariantly rough isometric to a
Euclidean space.


title: Energy dependence of nucleon-nucleon potentials

abstract:
  We investigate the energy dependence of potentials defined through the
Bethe-Salpeter wave functions. We analytically evaluate such a potential in the
Ising field theory in 2 dimensions and show that its energy dependence is weak
at low energy. We then numerically calculate the nucleon-nucleon potential at
non-zero energy using quenched QCD with anti-periodic boundary condition. In
this case we also observe that the potentials are almost identical at $E\simeq
0$ and $E\simeq 50$ MeV, where $E$ is the center of mass kinetic energy.


title:
BCS-BEC Crossover and Thermodynamics in Asymmetric Nuclear Matter with
  Pairings in Isospin I=0 and I=1 Channels

abstract:
  The BCS-BEC crossover and phase diagram for asymmetric nuclear superfluid
with pairings in isospin I = 0 and I = 1 channels are investigated at mean
field level, by using a density dependent nucleon-nucleon potential. Induced by
the in-medium nucleon mass and density dependent coupling constants,
neutron-proton Cooper pairs could be in BEC state at sufficiently low density,
but there is no chance for the BEC formation of neutron-neutron and
proton-proton pairs at any density and asymmetry. We calculate the phase
diagram in asymmetry-temperature plane for weakly interacting nuclear
superfluid, and find that including the I = 1 channel changes significantly the
phase structure at low temperature. There appears a new phase with both I = 0
and I = 1 pairings at low temperature and low asymmetry, and the gapless state
in any phase with I = 1 pairing is washed out and all excited nucleons are
fully gapped.


title:
Field theory of bicritical and tetracritical points. III. Relaxational
  dynamics including conservation of magnetization (Model C)

abstract:
  We calculate the relaxational dynamical critical behavior of systems of
$O(n_\|)\oplus O(n_\perp)$ symmetry including conservation of magnetization by
renormalization group (RG) theory within the minimal subtraction scheme in two
loop order. Within the stability region of the Heisenberg fixed point and the
biconical fixed point strong dynamical scaling holds with the asymptotic
dynamical critical exponent $z=2\phi/\nu-1$ where $\phi$ is the crossover
exponent and $\nu$ the exponent of the correlation length. The critical
dynamics at $n_\|=1$ and $n_\perp=2$ is governed by a small dynamical transient
exponent leading to nonuniversal nonasymptotic dynamical behavior. This may be
seen e.g. in the temperature dependence of the magnetic transport coefficients.


title: Classification de modules aux diff\'erences filtr\'es isogradu\'es

abstract:
  The local analytic classification of irregular linear q-difference equations
(Ramis-Sauloy-Zhang) involves the classfication of filtered q-difference
modules with a prescribed associated graded module. We prove in a more general
setting the existence for this problem of a moduli scheme which is an affine
space.
  -----
  La classification analytique locale des equations aux q-differences
irregulieres se ramene a la classification de modules aux q-differences filtres
a gradue fixe. Nous degageons ici des hypotheses generales qui assurent
l'existence d'un schema de modules pour ce probleme, qui soit de plus un espace
affine.


title: Simulating the All-Order Hopping Expansion II: Wilson Fermions

abstract:
  We investigate the extension of the Prokof'ev-Svistunov worm algorithm to
Wilson lattice fermions in an external scalar field. We effectively simulate by
Monte Carlo the graphs contributing to the hopping expansion of the two-point
function on a finite lattice to arbitrary order. Tests are conducted for a
constant background field i. e. free fermions at some mass. For the method
introduced here this is expected to be a representative case. Its advantage is
that we know the exact answers and can thus make stringent tests on the
numerics. The approach is formulated in both two and three space-time
dimensions. In D=2 Wilson fermions enjoy special positivity properties and the
simulation is similarly efficient as in the Ising model. In D=3 the method also
works at sufficiently large mass, but there is a hard sign problem in the
present formulation hindering us to take the continuum limit.


title: Does a functional integral really need a Lagrangian?

abstract:
  Path integral formulation of quantum mechanics (and also other equivalent
formulations) depends on a Lagrangian and/or Hamiltonian function that is
chosen to describe the underlying classical system. The arbitrariness presented
in this choice leads to a phenomenon called Quantization ambiguity. For example
both $L_1=\dot{q}^2$ and $L_2=e^\dot{q}$ are suitable Lagrangians on a
classical level ($\delta L_1=0=\delta L_2$), but quantum mechanically they are
diverse. This paper presents a simple rearrangement of the path integral to a
surface functional integral. It is shown that the surface functional integral
formulation gives transition probability amplitude which is free of any
Lagrangian/Hamiltonian and requires just the underlying classical equations of
motion. A simple example examining the functionality of the proposed method is
considered.


title:
Correlation between magnetism and spin-dependent transport in CoFeB
  alloys

abstract:
  We report a correlation between the spin polarization of the tunneling
electrons (TSP) and the magnetic moment of amorphous CoFeB alloys. Such a
correlation is surprising since the TSP involves s-like electrons close to the
Fermi level (EF), while the magnetic moment mainly arises due to all
d-electrons below EF. We show that probing the s and d-bands individually
provides clear and crucial evidence for such a correlation to exist through s-d
hybridization, and demonstrate the tuneability of the electronic and magnetic
properties of CoFeB alloys.


title: Can one improve the Froissart bound?

abstract:
  We explain why we hope that the Froissart bound can be improved, either
qualitatively or, more likely, quantitatively, by making a better use of
unitarity, in particular elastic unitarity. In other instances (Gribov's
theorem) elastic unitarity played a crucial role. A preliminary requirement for
this is to work with an appropriate average of the cross-section, to make the
problem well defined. This is possible, without destroying the Lukaszuk--Martin
bound.


title: Experience with CMS pixel software commissioning

abstract:
  The CMS Pixel detector, consisting of three barrel layers and two endcap
disks at each barrel end, was installed in the CMS experiment in summer 2008.
After a preliminary commissioning phase with pulse injections the detector
participated to data taking with cosmic ray trigger and 3.8T field. In this
article, we describe the software for event reconstruction, as well as the
status of the calibration tools. In addition, we report on the first running
experience with CMS and present preliminary results on detector performance.


title: K-Theory, D-Branes and Ramond-Ramond Fields

abstract:
  This thesis is dedicated to the study of K-theoretical properties of D-branes
and Ramond-Ramond fields. We construct abelian groups which define a homology
theory on the category of CW-complexes, and prove that this homology theory is
equivalent to the bordism representation of KO-homology, the dual theory to
KO-theory. We construct an isomorphism between our geometric representation and
the analytic representation of KO-homology, which induces a natural equivalence
of homology functors. We apply this framework to describe mathematical
properties of D-branes in type I String theory. We investigate the gauge theory
of Ramond-Ramond fields arising from type II String theory defined on global
orbifolds. We use the machinery of Bredon cohomology and the equivariant Chern
character to construct abelian groups which generalize the properties of
differential K-theory defined by Hopkins and Singer to the equivariant setting,
and can be considered as a differential extension of equivariant K-theory for
finite groups. We show that the Dirac quantization condition for Ramond-Ramond
fieldstrengths on a good orbifold is dictated by equivariant K-theory and the
equivariant Chern character, and study the group of flat Ramond-Ramond fields
in the particular case of linear orbifolds in terms of our orbifold
differential K-theory.


title: Variation of the subhalo abundance in dark matter halos

abstract:
  We analyzed the statistics of subhalo abundance of galaxy-sized and
giant-galaxy-sized halos formed in a high-resolution cosmological simulation of
a 46.5Mpc cube with the uniform mass resolution of $10^6 M_{\odot}$. We
analyzed all halos with mass more than $1.5 \times 10^{12}M_{\odot}$ formed in
this simulation box. The total number of halos was 125. We found that the
subhalo abundance, measured by the number of subhalos with maximum rotation
velocity larger than 10% of that of the parent halo, shows large halo-to-halo
variations. The results of recent ultra-high-resolution runs fall within the
variation of our samples. We found that the concentration parameter and the
radius at the moment of the maximum expansion shows fairly tight correlation
with the subhalo abundance. This correlation suggests that the variation of the
subhalo abundance is at least partly due to the difference in the formation
history. Halos formed earlier have smaller number of subhalos at present.


title:
Photon-assisted tunneling in optical lattices: Ballistic transport of
  interacting boson pairs

abstract:
  In a recent experiment [PRL 100, 040404 (2008)] an analog of photon-assisted
tunneling has been observed for a Bose-Einstein condensate in an optical
lattice subject to a constant force plus a sinusoidal shaking. Contrary to
previous theoretical predictions, the width of the condensate was measured to
be proportional to the square of the effective tunneling matrix element, rather
than a linear dependence. For a simple model of two interacting bosons in a
one-dimensional optical lattice, both analytical and numerical calculations
indicate that such a transition from a linear to a quadratic dependence can be
interpreted through the ballistic transport and the corresponding exact
dispersion relation of bound boson pairs.


title: The nuclear track detector CR39: results from different experiments

abstract:
  The nuclear track detector CR39 was calibrated with different ions of
different energies. Due to the low detection threshold (Z/beta~6e) and the good
charge resolution (sigma_Z ~ 0.2e for 6e < Z/beta <83e with 2 measurements),
the detector was used for different purposes: (i) fragmentation of high and
medium energy ions; (ii) search for magnetic monopoles, nuclearites,
strangelets and Q-balls in the cosmic radiation.


title: Cryptanalysis of the RSA-CEGD protocol

abstract:
  Recently, Nenadi\'c et al. (2004) proposed the RSA-CEGD protocol for
certified delivery of e-goods. This is a relatively complex scheme based on
verifiable and recoverable encrypted signatures (VRES) to guarantee properties
such as strong fairness and non-repudiation, among others. In this paper, we
demonstrate how this protocol cannot achieve fairness by presenting a severe
attack and also pointing out some other weaknesses.


title: Phase space polarization and the topological string: a case study

abstract:
  We review and elaborate on our discussion in hep-th/0606112 on the interplay
between the target space and the worldsheet description of the open topological
string partition function, for the example of the conifold. We discuss the
appropriate phase space and canonical form for the system. We find a map
between choices of polarization and the worldsheet description, based on which
we study the behavior of the partition function under canonical
transformations.


title: A generic multiplication in quantised Schur algebras

abstract:
  We define a generic multiplication in quantised Schur algebras and thus
obtain a new algebra structure in the Schur algebras. We prove that via a
modified version of the map from quantum groups to quantised Schur algebras,
defined by A. A. Beilinson, G. Lusztig and R. MacPherson, a subalgebra of this
new algebra is a quotient of the monoid algebra in Hall algebras studied by M.
Reineke. We also prove that the subalgebra of the new algebra gives a geometric
realisation of a positive part of 0-Schur algebras. Consequently, we obtain a
multiplicative basis for the positive part of 0-Schur algebras.


title: Binary Galaxies in the Local Supercluster and Its Neighborhood

abstract:
  We report a catalog of 509 pairs identified among 10403 nearby galaxies with
line-of-sight velocities V_LG < 3500 km/s.We selected binary systems in
accordance with two criteria (bounding and temporal), which require the
physical pair of galaxies to have negative total energy and its components to
be located inside the zero-velocity surface. We assume that individual galaxy
masses are proportional to their total K-band luminosities, M = L_K x 6M/L. The
catalog gives the magnitudes and morphological types of galaxies and also the
projected (orbital) masses and pair isolation indices. The component
line-of-sight velocity differences and projected distances of the binary
systems considered have power-law distributions with the median values of 35
km/s and 123 kpc, respectively. The median mass-to-K-band luminosity ratio is
equal to 11 M/L, and its uncertainty is mostly due to the errors of measured
velocities. Our sample of binary systems has a typical density contrast of d
ro/ro_c ~ 500 and a median crossing time of about 3.5 Gyr. We point out the
substantial fraction of binary systems consisting of late-type dwarf galaxies,
where the luminosities of both components are lower than that of the Small
Magellanic Cloud. The median projected distance for 41 such pairs is only 30
kpc, and the median difference of their line-of-sight velocities is equal to 14
km/s which is smaller than the typical error for radial-velocity (30 km/s).
This specific population of gas-rich dwarf binary galaxies such as I Zw 18 may
be at the stage immediately before merging of its components. Such objects,
which are usually lost in flux-limited (and not distance-limited) samples
deserve a thorough study in the HI radio line with high spatial and velocity
resolution.


title:
Anomalies in thickness measurements of graphene and few layer graphite
  crystals by tapping mode atomic force microscopy

abstract:
  Atomic Force Microscopy (AFM) in the tapping (intermittent contact) mode is a
commonly used tool to measure the thickness of graphene and few layer graphene
(FLG) flakes on silicon oxide surfaces. It is a convenient tool to quickly
determine the thickness of individual FLG films. However, reports from
literature show a large variation of the measured thickness of graphene layers.
This paper is focused on the imaging mechanism of tapping mode AFM (TAFM) when
measuring graphene and FLG thickness and we show that at certain measurement
parameters significant deviations can be introduced in the measured thickness
of FLG flakes. An increase of as much as 1 nm can be observed in the measured
height of FLG crystallites, when using an improperly chosen range of free
amplitude values of the tapping cantilever. We present comparative Raman
spectroscopy and TAFM measurements on selected single and multilayer graphene
films, based on which we suggest ways to correctly measure graphene and FLG
thickness using TAFM.


title: Mass Hierarchy of Collisional Energy Loss

abstract:
  Collisional parton energy loss is revisited within a simple model assuming
incoherent elastic scattering of on-shell projectile partons on partonic
constituents of the QGP with HTL screening. The thermal motion of plasma
particles is carefully taken into account. Results on $dE/dx$ are found to be
consistent with other authors. There is a significant discrepancy in the energy
loss pattern for the cases with thermal motion on and off, which illustrates
the importance of taking the kinematics into account exactly. The dependence on
the mass of the partons forming the plasma is included in the calculations and
its influence on the collisional energy loss is studied. The mass hierarchy of
collisional energy loss is found to have a strong dependence on the mass
introduced for plasma particles. Due to difference in the mass hierarchy with
radiative energy loss, the collisional one when included increases the relative
suppression of heavy quarks compared to light quarks.


title: Generalised Kramers model

abstract:
  We study a particular generalisation of the classical Kramers model
describing Brownian particles in the external potential. The generalised model
includes the stochastic force which is modelled as an additive random noise
that depends upon the position of the particle, as well as time. The stationary
solution of the Fokker-Planck equation is analysed in two limits: weak external
forcing, where the solution is equivalent to the increase of the potential
compared to the classical model, and strong external forcing, where the
solution yields a non-zero probability flux for the motion in a periodic
potential with a broken reflection symmetry.


title:
On the spectrum of fluctuations of a liquid surface: From the molecular
  scale to the macroscopic scale

abstract:
  We show that to account for the full spectrum of surface fluctuations from
low scattering vector qd << 1 (classical capillary wave theory) to high qd > 1
(bulk-like fluctuations), one must take account of the interface's bending
rigidity at intermediate scattering vector qd = 1, where d is the molecular
diameter. A molecular model is presented to describe the bending correction to
the capillary wave model for short-ranged and long-ranged interactions between
molecules. We find that the bending rigidity is negative when the Gibbs
equimolar surface is used to define the location of the fluctuating interface
and that on approach to the critical point it vanishes proportionally to the
interfacial tension. Both features are in agreement with Monte Carlo
simulations of a phase-separated colloid-polymer system.


title: Quantum annealing and the Schr\"odinger-Langevin-Kostin equation

abstract:
  We show, in the context of quantum combinatorial optimization, or quantum
annealing, how the nonlinear Schr\"odinger-Langevin-Kostin equation can
dynamically drive the system toward its ground state. We illustrate, moreover,
how a frictional force of Kostin type can prevent the appearance of genuinely
quantum problems such as Bloch oscillations and Anderson localization which
would hinder an exhaustive search.


title:
Texture zeroes and discrete flavor symmetries in light and heavy
  Majorana neutrino mass matrices: a bottom-up approach

abstract:
  Texture zeroes in neutrino mass matrix $M_\nu$ may give us hints about the
symmetries involved in neutrino mass generation. We examine the viability of
such texture zeroes in a model independent way through a bottom-up approach.
Using constraints from the neutrino oscillation data, we develop an analytic
framework that can identify these symmetries and quantify deviations from them.
We analyze the textures of $M_\nu$ as well as those of $M_M$, the mass matrix
of heavy Majorana neutrinos in the context of Type-I seesaw. We point out how
the viability of textures depends on the absolute neutrino mass scale, the
neutrino mass ordering and the mixing angle $\theta_{13}$. We also examine the
compatibility of discrete flavor symmetries like $\mu$--$\tau$ exchange and
$S_3$ permutation with the current data. We show that the $\mu-\tau$ exchange
symmetry for $M_\nu$ can be satisfied for any value of the absolute neutrino
mass, but for $M_\nu$ to satisfy the $S_3$ symmetry, neutrino masses have to be
quasi-degenerate. On the other hand, both these symmetries are currently
allowed for $M_M$ for all values of absolute neutrino mass and both mass
orderings.


title:
Planar metamaterial with transmission and reflection that depend on the
  direction of incidence

abstract:
  We report that normal incidence reflection and transmission of circularly
polarized electromagnetic waves from and through planar split-ring
metamaterials with chiral symmetry breaking depends on the incidence direction
and handedness of circular polarization. The effect has a resonant nature and
is linked to the lack of mirror-symmetry in the metamaterial pattern leading to
a polarization-sensitive excitation of electric and magnetic dipolar responses
in the meta-molecules.


title: Statistical theory of structure formation: self-organization

abstract:
  We present the first prediction of the probability distribution function
(PDF) for self-organization of shear flows modeled by a nonlinear diffusion
equation with a stochastic forcing. A novel non-perturbative method based on a
coherent structure is utilized for the prediction of the PDFs, revealing strong
intermittency with exponential tails. Numerical simulations confirm these
results. The predicted power spectra are also in a good agreement with
simulation results. The results imply a significant probability of
supercritical states due to stochastic perturbation in a variety of systems.


title: Emergent Community Structure in Social Tagging Systems

abstract:
  A distributed classification paradigm known as collaborative tagging has been
widely adopted in new Web applications designed to manage and share online
resources. Users of these applications organize resources (Web pages, digital
photographs, academic papers) by associating with them freely chosen text
labels, or tags. Here we leverage the social aspects of collaborative tagging
and introduce a notion of resource distance based on the collective tagging
activity of users. We collect data from a popular system and perform
experiments showing that our definition of distance can be used to build a
weighted network of resources with a detectable community structure. We show
that this community structure clearly exposes the semantic relations among
resources. The communities of resources that we observe are a genuinely
emergent feature, resulting from the uncoordinated activity of a large number
of users, and their detection paves the way for mapping emergent semantics in
social tagging systems.


title:
Applicability and non-applicability of equilibrium statistical mechanics
  to non-thermal damage phenomena: II. Spinodal behavior

abstract:
  This paper investigates the spinodal behavior of non-thermal damage
phenomena. As an example, a non-thermal fiber-bundle model with the global
uniform (meanfield) load sharing is considered. In the vicinity of the spinodal
point the power-law scaling behavior is found. For the meanfield fiber-bundle
model the spinodal exponents are found to have typical meanfield values.


title:
Acceleration of ultra-thin electron layer. Analytical treatment compared
  with 1D-PIC simulation

abstract:
  In this paper, we apply an analytical model [V.V. Kulagin et al., Phys.
Plasmas 14,113101 (2007)] to describe the acceleration of an ultra-thin
electron layer by a schematic single-cycle laser pulse and compare with
one-dimensional particle-in-cell (1D-PIC) simulations. This is in the context
of creating a relativistic mirror for coherent backscattering and supplements
two related papers in this EPJD volume. The model is shown to reproduce the
1D-PIC results almost quantitatively for the short time of a few laser periods
sufficient for the backscattering of ultra-short probe pulses.


title: Light-ion production in the interaction of 96 MeV neutrons with carbon

abstract:
  Double-differential cross sections for light-ion (p, d, t, 3He and alpha)
production in carbon induced by 96 MeV neutrons have been measured at eight
laboratory angles from 20 degrees to 160 degrees in steps of 20 degrees.
Experimental techniques are presented as well as procedures for data taking and
data reduction. Deduced energy-differential, angle-differential and production
cross sections are reported. Experimental cross sections are compared with
theoretical reaction model calculations and experimental data in the
literature. The measured particle data show marked discrepancies from the
results of the model calculations in spectral shape and magnitude. The measured
production cross sections for protons, deuterons, tritons, 3He, and alpha
particles support the trends suggested by data at lower energies.


title: Passage of radiation through wormholes

abstract:
  We investigate numerically the process of the passage of a radiation pulse
through a wormhole and the subsequent evolution of the wormhole that is caused
by the gravitational action of this pulse. The initial static wormhole is
modeled by the spherically symmetrical Armendariz-Picon solution with zero
mass. The radiation pulses are modeled by spherically symmetrical shells of
self-gravitating massless scalar fields. We demonstrate that the compact signal
propagates through the wormhole and investigate the dynamics of the fields in
this process for both cases: collapse of the wormhole into the black hole and
for the expanding wormhole.


title: The reflectivity of relativistic ultra-thin electron layers

abstract:
  The coherent reflectivity of a dense, relativistic, ultra-thin electron layer
is derived analytically for an obliquely incident probe beam. Results are
obtained by two-fold Lorentz transformation. For the analytical treatment, a
plane uniform electron layer is considered. All electrons move with uniform
velocity under an angle to the normal direction of the plane; such electron
motion corresponds to laser acceleration by direct action of the laser fields,
as it is described in a companion paper. Electron density is chosen high enough
to ensure that many electrons reside in a volume \lambda_R^3, where \lambda_R
is the wavelength of the reflected light in the rest frame of the layer. Under
these conditions, the probe light is back-scattered coherently and is directed
close to the layer normal rather than the direction of electron velocity. An
important consequence is that the Doppler shift is governed by
\gamma_x=(1-(V_x/c)^2)^{-1/2} derived from the electron velocity component V_x
in normal direction rather than the full \gamma-factor of the layer electrons.


title:
Correct use of the Gordon decomposition in the calculation of nucleon
  magnetic dipole moments

abstract:
  We perform the calculation of the nucleon dipole magnetic moment in full
detail using the Gordon decomposition of the free quark current. This
calculation has become necessary because of frequent misuse of the Gordon
decomposition by some authors in computing the nucleon dipole magnetic moment.


title: Natural Boundary Conditions in the Calculus of Variations

abstract:
  We prove necessary optimality conditions for problems of the calculus of
variations on time scales with a Lagrangian depending on the free end-point.


title: Which notes are Vadi-Samvadi in Raga Rageshree?

abstract:
  The notes which play the most important and second most important roles in
expressing a raga are called Vadi and Samvadi swars respectively in (North)
Indian Classical music. Like Bageshree, Bhairavi, Shankara, Hamir and Kalingra,
Rageshree is another controversial raga so far as the choice of Vadi-Samvadi
selection is concerned where there are two different opinions. In the present
work, a two minute vocal recording of raga Rageshree is subjected to a careful
statistical analysis. Our analysis is broken into three phases: first half,
middle half and last half. Under a multinomial model set up holding appreciably
in the first two phases, only one opinion is found acceptable. In the last
phase the distribution seems to be quasi multinomial, characterized by an
unstable nature of relative occurrence of pitch of all the notes and although
the note whose relative occurrence of pitch suddenly shoots is the Vadi swar
selected from our analysis of the first two phases, we take it as an outlier
demanding a separate treatment like any other in statistics. Selection of
Vadi-Samvadi notes in a quasi-multinomial set up is still an open research
problem. An interesting musical cocktail is proposed, however, embedding
several ideas like melodic property of notes, note combinations and pitch
movements between notes, using some weighted combination of psychological and
statistical stability of notes along with watching carefully the sudden shoot
of one or more notes whenever there is enough evidence that multinomial model
has broken down.


title: Notes on Cohomologies of Ternary Algebras of Associative Type

abstract:
  The aim of this paper is to investigate the cohomologies for ternary algebras
of associative type. We study in particular the cases of partially associative
ternary algebras and weak totally associative ternary algebras. Also, we
consider the Takhtajan's construction, which was used to construct a cohomology
of ternary Nambu-Lie algebras using Chevalley-Eilenberg cohomology of Lie
algebras, and discuss it in the case of ternary algebras of associative type.
One of the main results of this paper states that a deformation cohomology does
not exist for partially associative ternary algebras which implies that their
operad is not a Koszul operad.


title: Zeros of the hypergeometric polynomial F(-n,b;c;z)

abstract:
  Our interest lies in describing the zero behaviour of Gauss hypergeometric
polynomials $F(-n,b; c; z)$ where $b$ and $c$ are arbitrary parameters. In
general, this problem has not been solved and even when $b$ and $c$ are both
real, the only cases that have been fully analyzed impose additional
restrictions on $b$ and $c$. We review recent results that have been proved for
the zeros of several classes of hypergeometric polynomials $F(-n,b; c; z)$
where $b$ and $c$ are real. We show that the number of real zeros of $F(-n,b;
c; z)$ for arbitrary real values of the parameters $b$ and $c$, as well as the
intervals in which these zeros (if any) lie, can be deduced from corresponding
results for Jacobi polynomials.


title: Experimental entanglement distillation of mesoscopic quantum states

abstract:
  The distribution of entangled states between distant parties in an optical
network is crucial for the successful implementation of various quantum
communication protocols such as quantum cryptography, teleportation and dense
coding [1-3]. However, owing to the unavoidable loss in any real optical
channel, the distribution of loss-intolerant entangled states is inevitably
inflicted by decoherence, which causes a degradation of the transmitted
entanglement. To combat the decoherence, entanglement distillation, which is
the process of extracting a small set of highly entangled states from a large
set of less entangled states, can be used [4-14]. Here we report on the
mesoscopic distillation of deterministically prepared entangled light pulses
that have undergone non-Gaussian noise. The entangled light pulses [15-17] are
sent through a lossy channel, where the transmission is varying in time
similarly to light propagation in the atmosphere. By employing linear optical
components and global classical communication, the entanglement is
probabilistically increased.


title:
Coherent Thomson backscattering from laser-driven relativistic
  ultra-thin electron layers

abstract:
  The generation of laser-driven dense relativistic electron layers from
ultra-thin foils and their use for coherent Thomson backscattering is
discussed, applying analytic theory and one-dimensional particle-in-cell
simulation. The blow-out regime is explored in which all foil electrons are
separated from ions by direct laser action. The electrons follow the light wave
close to its leading front. Single electron solutions are applied to initial
acceleration, phase switching, and second-stage boosting. Coherently reflected
light shows Doppler-shifted spectra, chirped over several octaves. The Doppler
shift is found to be proportional to \gamma_x^2=1/(1-\beta_x^2), where \beta_x
is the electron velocity component in normal direction of the electron layer
which is also the direction of the driving laser pulse. Due to transverse
electron momentum p_y, the Doppler shift by
4*\gamma_x^2=4*\gamma^2/(1+(p_y/mc)^2) ~= 2*\gamma is significantly smaller
than full shift of 4*\gamma^2. Methods to turn p_y -> 0 and to recover the full
Doppler shift are proposed and verified by 1D-PIC simulation. These methods
open new ways to design intense single attosecond pulses.


title: Equilibrium Shape and Size of Supported Heteroepitaxial Nanoislands

abstract:
  We study the equilibrium shape, shape transitions and optimal size of
strained heteroepitaxial nanoislands with a two-dimensional atomistic model
using simply adjustable interatomic pair potentials. We map out the global
phase diagram as a function of substrate-adsorbate misfit and interaction. This
phase diagram reveals all the phases corresponding to different well-known
growth modes. In particular, for large enough misfits and attractive substrate
there is a Stranski-Krastanow regime, where nano-sized islands grow on top of
wetting films. We analyze the various terms contributing to the total island
energy in detail, and show how the competition between them leads to the
optimal shape and size of the islands. Finally, we also develop an analytic
interpolation formula for the various contributions to the total energy of
strained nanoislands.


title: A new perspective on the dynamics of fragmented populations

abstract:
  Understanding the time evolution of fragmented animal populations and their
habitats, connected by migration, is a problem of both theoretical and
practical interest. This paper presents a method for calculating the time
evolution of the habitats' population size distribution from a general
stochastic dynamic within each habitat, using a deterministic approximation
which becomes exact for an infinite number of habitats. Fragmented populations
are usually thought to be characterized by a separation of time scale between,
on the one hand, colonization and extinction of habitats and, on the other
hand, the local population dynamics within each habitat. The analysis in this
paper suggests an alternative view: the effective population dynamic stems from
a law of large numbers, where stochastic fluctuations in population size of
single habitats are buffered through the dispersal pool so that the global
population dynamic remains approximately smooth. For illustration, the
deterministic approximation is compared to simulations of a stochastic model
with density dependent local recruitment and mortality. The article is
concluded with a discussion of the general implications of the results, and
possible extensions of the method.


title:
Relation of a Unified Quantum Field Theory of Spinors to the Structure
  of General Relativity

abstract:
  Based on a unified quantum field theory of spinors assumed to describe all
matter fields and their interactions we construct the space time structure of
general relativity according to a general connection within the corresponding
spinor space. The tetrad field and the corresponding metric field are composed
from a space time dependent basis of spinors within the internal space of the
fundamental matter field. Similar to twistor theory the Minkowski signature of
the space time metric is related to this spinor nature of elementary matter, if
we assume the spinor space to be endowed with a symplectic structure. The
equivalence principle and the property of background independence arise from
the fact that all elementary fields are composed from the fundamental spinor
field. This means that the structure of space time according to general
relativity seems to be a consequence of a fundamental theory of matter fields
and not a presupposition as in the usual setting of relativistic quantum field
theories.


title: Remarks on the structure of Clifford quantum cellular automata

abstract:
  We report here on the structure of reversible quantum cellular automata with
the additional restriction that these are also Clifford operations. This means
that tensor products of Weyl operators (projective representation of a finite
abelian symplectic group) are mapped to multiples of tensor products of Weyl
operators. Therefore Clifford quantum cellular automata are induced by
symplectic cellular automata in phase space. We characterize these symplectic
cellular automata and find that all possible local rules must be, up to some
global shift, reflection invariant with respect to the origin. In the one
dimensional case we also find that all 1D Clifford quantum cellular automata
are generated by a few elementary operations.


title: Free joinings of C*-dynamical systems

abstract:
  Joinings of C*-dynamical systems are defined in terms of free products of
C*-algebras, as an analogue of joinings of classical dynamical systems. We then
consider disjointness in this context, in particular for ergodic versus
identity systems. Lastly we show how multi-time correlation functions appearing
in quantum statistical mechanics naturally fit into this joining framework.


title: Radiative transitions of heavy quarkonium states

abstract:
  We study radiative decays of heavy $Q{\bar Q}$ states, both for $Q=c$ and
$Q=b$, using an effective Lagrangian approach which exploits spin symmetry for
such states. We use existing data on radiative quarkonium transitions to
predict some unmeasured decay rates. We also discuss how these modes can be
useful to understand the structure of X(3872).


title: Generalized squeezed states for the Jacobi group

abstract:
  We analyze the relationship between the covering of the Jacobi group and the
squeezed states. We attach some nonclassical states to the Jacobi group. The
matrix elements of the Jacobi group are presented.

categories: math.DG math-ph math.MP math.RT physics.optics


title: Instabilities of Kerr-AdS_5 x S^5 Spacetime

abstract:
  We study gravitational perturbations of the Kerr-AdS_5 x S^5 spacetime with
equal angular momenta. In this spacetime, we found the two kinds of classical
instabilities, superradiant and Gregory-Laflamme instabilities. The
superradiant instability is caused by the wave amplification via superradiance,
and by wave reflection due to the potential barrier of the AdS spacetime. The
Gregory-Laflamme instability appears in Kaluza-Klein modes of the internal
space S^5 and breaks the symmetry SO(6). Taken into account these
instabilities, the phase structure of Kerr-AdS_5 x S^5 spacetime is revealed.
The implication for the AdS/CFT correspondence is also discussed.


title:
Time-dependent energetic proton acceleration and scaling laws in
  ultra-intense laser pulses interactions with thin foils

abstract:
  A two-phase model, where the plasma expansion is an isothermal one when laser
irradiates and a following adiabatic one after laser ends, has been proposed to
predict the maximum energy of the proton beams induced in the ultra-intense
laser-foil interactions. The hot-electron recirculation in the ultra-intense
laser-solid interactions has been accounted in and described by the
time-dependent hot-electron density continuously in this model. The dilution
effect of electron density as electrons recirculate and spread laterally has
been considered. With our model, the scaling laws of maximum ion energy have
been achieved and the dependence of the scaling coefficients on laser
intensity, pulse duration and target thickness have been obtained. Some
interesting results have been predicted: the adiabatic expansion is an
important process of the ion acceleration and cannot be neglected; the whole
acceleration time is about 10-20 times of laser pulse duration; the larger the
laser intensity, the more sensitive the maximum ion energy to the change of
focus radius, and so on.


title:
Quasiperiodic oscillations in a strong gravitational field around
  neutron stars testing braneworld models

abstract:
  The strong gravitational field of neutron stars in the brany universe could
be described by spherically symmetric solutions with a metric in the exterior
to the brany stars being of the Reissner-Nordstrom type containing a brany
tidal charge representing the tidal effect of the bulk spacetime onto the star
structure. We investigate the role of the tidal charge in orbital models of
high-frequency quasiperiodic oscillations (QPOs) observed in neutron star
binary systems. We focus on the relativistic precession model. We give the
radial profiles of frequencies of the Keplerian (vertical) and radial epicyclic
oscillations. We show how the standard relativistic precession model modified
by the tidal charge fits the observational data, giving estimates of the
allowed values of the tidal charge and the brane tension based on the processes
going in the vicinity of neutron stars. We compare the strong field regime
restrictions with those given in the weak-field limit of solar system
experiments.


title:
A Pedestrian Introduction to the Mathematical Concepts of Quantum
  Physics

abstract:
  These notes offer a basic introduction to the primary mathematical concepts
of quantum physics, and their physical significance, from the operator and
Hilbert space point of view, highlighting more what are essentially the
abstract algebraic aspects of quantisation in contrast to more standard
treatments of such issues, while also bridging towards the path integral
formulation of quantisation. A discussion of the (first) Noether theorem and
Lie symmetries is also included to complement the presentation. Emphasis is put
throughout, as illustrative examples threading the presentation, on the quantum
harmonic oscillator and the dynamics of a charged particle coupled to the
electromagnetic field, with the ambition to bring the reader onto the threshold
of relativistic quantum field theories with their local gauge invariances as a
natural framework for describing relativistic quantum particles in interaction
and carrying specific conserved charges.


title:
The Ratio $R=F_L/F_T$ in DIS as a Probe of the Charm Content of the
  Proton

abstract:
  We analyze the Callan-Gross ratio $R(x,Q^2)=F_L/F_T$ in heavy-quark
leptoproduction as a probe of the charm content of the proton. To estimate the
charm-initiated contributions, we use the ACOT($\chi$) variable-flavor-number
scheme. Our analysis shows that charm densities of the recent CTEQ sets of
parton distributions have sizeable impact on the Callan-Gross ratio in a wide
region of $x$ and $Q^2$. In particular, the ACOT($\chi$) predictions for the
quantity $R(x,Q^2)$ are about half as large as the corresponding expectations
of the photon-gluon fusion mechanism for $x\sim 10^{-2}-10^{-1}$ and $Q^2\gg
m^2$. This is because the structure functions $F_T (x,Q^2)$ and $F_L (x,Q^2)$
have different dependences on the mass logarithms of the type
$\alpha_{s}\ln(Q^{2}/m^{2})$. On the other hand, our recent studies indicate
that, contrary to the production cross sections, the Callan-Gross ratio is
sufficiently stable under radiative corrections to the photon-gluon fusion
component for $x\gtrsim 10^{-4}$. We conclude that the quantity $R(x,Q^2)$ in
heavy-quark leptoproduction is perturbatively stable but sensitive to
resummation of the mass logarithms. For this reason, in contrast to the
structure functions, the ratio $R(x,Q^2)=F_L/F_T$ could be good probe of the
charm density in the proton.


title:
Highly sensitive gamma-spectrometers of GERDA for material screening:
  Part I

abstract:
  The GERDA experiment aims to search for the neutrinoless double beta-decay of
76Ge and possibly for other rare processes. The sensitivity of the first phase
is envisioned to be more than one order of magnitude better than in previous
neutrinoless double beta-decay experiments. This implies that materials with
ultra-low radioactive contamination need to be used for the construction of the
detector and its shielding. Therefore the requirements on material screening
include high-sensitivity low-background detection techniques and long
measurement times. In this article, an overview of material-screening
laboratories available to the GERDA collaboration is given, with emphasis on
the gamma-spectrometry. Additionally, results of an intercomparison of the
evaluation accuracy in these laboratories are presented.


title: Holomorphic Extension of Eigenfunctions

abstract:
  Let X be a Riemannian symmetric space of non-compact type. We prove a theorem
of holomorphic extension for eigenfunctions of the Laplace-Beltrami operator on
X, by techniques from the theory of partial differential equations.


title:
Classes of f-Deformed Landau Operators: Nonlinear Noncommutative
  Coordinates from Algebraic Representations

abstract:
  We consider, in a superspace, new operator dependent noncommutative (NC)
geometries of the nonlinear quantum Hall limit related to classes of f-deformed
Landau operators in the spherical harmonic well. Different NC coordinate
algebras are determined using unitary representation spaces of Fock-Heisenberg
tensored algebras and of the Schwinger-Fock realisation of the su(1,1) Lie
algebra. A reduced model allowing an underlying N=2 superalgebra is also
discussed.


title:
Convexity of the zeros of some orthogonal polynomials and related
  functions

abstract:
  We study convexity properties of the zeros of some special functions that
follow from the convexity theorem of Sturm. We prove results on the intervals
of convexity for the zeros of Laguerre, Jacobi and ultraspherical polynomials,
as well as functions related to them, using transformations under which the
zeros remain unchanged. We give upper as well as lower bounds for the distance
between consecutive zeros in several cases.


title:
Lepton Flavor Violating $\tau^- \to \mu^- V^0$ Decays in the Two Higgs
  Doublet Model III

abstract:
  In this paper, the lepton flavor violating $\tau^- \to \mu^-
V^0(V^0=\rho^0,\phi,\omega)$ decays are studied in the framework of the two
Higgs doublet model(2HDM) III. We present a computation of the the $\gamma-$,
$Z$ penguin and box diagrams contributions, and make an analysis of their
impacts. Our results show that, among the $\gamma-$ penguins, the penguins with
neutral Higgs in the loop are very larger than those with charged Higgs in the
loop. We find that the model parameter $\lambda_{\tau\mu}$ is tightly
constrained at the order of $O(10^{-3})$ and the branching ratios of these
decays are available at the experiment measure. With the high luminosity, the B
factories have considerable capability to find these LFV processes. On the
other hand, these processes can also provide some valuable information to
future research and furthermore present the reliable evidence to test the 2HDM
III model.


title: Note on the X_(1)-Jacobi orthogonal polynomials

abstract:
  This note supplements the work of Gomez-Ullate, Kamran and Milson on the
X_(1)-Jacobi polynomials which are orthogonal in a weighted Hilbert function
space on the the interval (-1,+1) of the real line. These polynomials are
generated by a second-order ordinary linear differential equation with a
spectral parameter. Some additional information on the Sturm-Liouville form of
this equation is given in this note, together with details of the singular
differential operators generated in the weighted Hilbert function space. In
particular, structured boundary conditions are given to determine the special
self-adjoint operator, whose discrete spectrum and associated eigenvectors
yield the X_(1)-Jacobi polynomials.


title:
The 1+1 Dimensional Abelian Higgs Model Revisited: Non-perturbative
  Dynamics in the Physical Sector

abstract:
  In this paper the two dimensional Abelian Higgs model is revisited. We show
that in the physical sector, this model describes the coupling of the electric
field to the radial part, in field space, of the complex scalar field.


title:
Zeros of linear combinations of Laguerre polynomials from different
  sequences

abstract:
  We study interlacing properties of the zeros of two types of linear
combinations of Laguerre polynomials with different parameters, namely
$R_n=L_n^{\alpha}+aL_{n}^{\alpha'}$ and $S_n=L_n^{\alpha}+bL_{n-1}^{\alpha'}$.
Proofs and numerical counterexamples are given in situations where the zeros of
$R_n$, and $S_n$, respectively, interlace (or do not in general) with the zeros
of $L_k^{\alpha}$, $L_k^{\alpha'}$, $k=n$ or $n-1$. The results we prove hold
for continuous, as well as integral, shifts of the parameter $\alpha$.


title:
Two Approaches to Dislocation Nucleation in the Supported
  Heteroepitaxial Equilibrium Islanding Phenomenon

abstract:
  We study the dislocation formation in 2D nanoscopic islands with two methods,
the Molecular Static method and the Phase Field Crystal method. It is found
that both methods indicate the same qualitative stages of the nucleation
process. The dislocations nucleate at the film-substrate contact point and the
energy decreases monotonously when the dislocations are farther away from the
island-wetting film contact points than the distance of the highest energy
barrier.


title:
The 1+1 Dimensional Abelian Higgs Model Revisited: Physical Sector and
  Solitons

abstract:
  In this paper the two dimensional abelian Higgs model is revisited. We show
that in the physical sector, the solutions to the Euler-Lagrange equations
include solitons.


title: Nonhomogeneous parking functions and noncrossing partitions

abstract:
  For each skew shape we define a nonhomogeneous symmetric function,
generalizing a construction of Pak and Postnikov. In two special cases, we show
that the coefficients of this function when expanded in the complete
homogeneous basis are given in terms of the (reduced) type of $k$-divisible
noncrossing partitions. Our work extends Haiman's notion of a parking function
symmetric function.


title:
Kinematic distributions and nuclear effects of $J/\psi$ production in
  920 GeV fixed-target proton-nucleus collisions

abstract:
  Measurements of the kinematic distributions of $J/\psi$ mesons produced in
$p-$C, $p-$Ti and $p-$W collisions at $\sqrt{s}=41.6 \mathrm{GeV}$ in the
Feynman-$x$ region $-0.34 < x_{F} < 0.14$ and for transverse momentum up to
$p_T = 5.4 \mathrm{GeV}/c$ are presented. The $x_F$ and $p_T$ dependencies of
the nuclear suppression parameter, $\alpha$, are also given. The results are
based on $2.4 \cdot 10^{5}$ $J/\psi$ mesons in both the $e^+ e^-$ and
$\mu^{+}\mu^{-}$ decay channels. The data have been collected by the HERA-B
experiment at the HERA proton ring of the DESY laboratory. The measurement
explores the negative region of $x_{F}$ for the first time. The average value
of $\alpha$ in the measured $x_{F}$ region is $0.981 \pm 0.015$. The data
suggest that the strong nuclear suppression of $J/\psi$ production previously
observed at high $x_F$ turns into an enhancement at negative $x_F$.


title: New analytic unitarization schemes

abstract:
  We consider two well-known classes of unitarization of Born amplitudes of
hadron elastic scattering. The standard class, which saturates at the black
disk limit includes the standard eikonal representation, while the other class,
which goes beyond the black-disk limit to reach the full unitarity circle,
includes the U matrix. It is shown that the basic properties of these schemes
are independent of the functional form used for the unitarisation, and that U
matrix and eikonal schemes can be extended to have similar properties. A common
form of unitarisation is proposed interpolating between both classes. The
correspondence with different nonlinear equations are also briefly examined.


title: Fully distributed and fault tolerant task management based on diffusions

abstract:
  The task management is a critical component for the computational grids. The
aim is to assign tasks on nodes according to a global scheduling policy and a
view of local resources of nodes. A peer-to-peer approach for the task
management involves a better scalability for the grid and a higher fault
tolerance. But some mechanisms have to be proposed to avoid the computation of
replicated tasks that can reduce the efficiency and increase the load of nodes.
In the same way, these mechanisms have to limit the number of exchanged
messages to avoid the overload of the network.
  In a previous paper, we have proposed two methods for the task management
called active and passive. These methods are based on a random walk: they are
fully distributed and fault tolerant. Each node owns a local tasks states set
updated thanks to a random walk and each node is in charge of the local
assignment. Here, we propose three methods to improve the efficiency of the
active method. These new methods are based on a circulating word. The nodes
local tasks states sets are updated thanks to periodical diffusions along trees
built from the circulating word. Particularly, we show that these methods
increase the efficiency of the active method: they produce less replicated
tasks. These three methods are also fully distributed and fault tolerant. On
the other way, the circulating word can be exploited for other applications
like the resources management or the nodes synchronization.


title:
Implementing topological quantum manipulation with superconducting
  circuits

abstract:
  A two-component fermion model with conventional two-body interactions was
recently shown to have anyonic excitations. We here propose a scheme to
physically implement this model by transforming each chain of two two-component
fermions to the two capacitively coupled chains of superconducting devices. In
particular, we elaborate how to achieve the wanted operations to create and
manipulate the topological quantum states, providing an experimentally feasible
scenario to access the topological memory and to build the anyonic
interferometry.


title:
Preparation of distilled and purified continuous variable entangled
  states

abstract:
  The distribution of entangled states of light over long distances is a major
challenge in the field of quantum information. Optical losses, phase diffusion
and mixing with thermal states lead to decoherence and destroy the
non-classical states after some finite transmission-line length. Quantum
repeater protocols, which combine quantum memory, entanglement distillation and
entanglement swapping, were proposed to overcome this problem. Here we report
on the experimental demonstration of entanglement distillation in the
continuous-variable regime. Entangled states were first disturbed by random
phase fluctuations and then distilled and purified using interference on beam
splitters and homodyne detection. Measurements of covariance matrices clearly
indicate a regained strength of entanglement and purity of the distilled
states. In contrast to previous demonstrations of entanglement distillation in
the complementary discrete-variable regime, our scheme achieved the actual
preparation of the distilled states, which might therefore be used to improve
the quality of downstream applications such as quantum teleportation.


title: A Limit Relation for Dunkl-Bessel Functions of Type A and B

abstract:
  We prove a limit relation for the Dunkl-Bessel function of type $B_N$ with
multiplicity parameters $k_1$ on the roots $\pm e_i$ and $k_2$ on $\pm e_i\pm
e_j$ where $k_1$ tends to infinity and the arguments are suitably scaled. It
gives a good approximation in terms of the Dunkl-type Bessel function of type
$A_{N-1}$ with multiplicity $k_2$. For certain values of $k_2$ an improved
estimate is obtained from a corresponding limit relation for Bessel functions
on matrix cones.


title:
Generalized fluctuation-dissipation relation and effective temperature
  in off-equilibrium colloids

abstract:
  The fluctuation-dissipation relation (FDR), a fundamental result of
equilibrium statistical physics, ceases to be valid when a system is taken out
of the equilibrium. A generalization of FDR has been theoretically proposed for
out-of-equilibrium systems: the kinetic temperature entering FDR is substituted
by a time-scale dependent effective temperature. We combine the measurements of
the correlation function of the rotational dynamics of colloidal particles
obtained via dynamic light scattering with those of the birefringence response
to study the generalized FDR in an off-equilibrium clay suspension undergoing
aging. We i) find that FDR is strongly violated in the early stage of the aging
process and is gradually recovered as the aging time increases and, ii), we
determine the aging time evolution of the effective temperature, giving support
to the proposed generalization scheme.


title: On the Lieb-Liniger model in the infinite coupling constant limit

abstract:
  We consider the one-dimensional Lieb-Liniger model (bosons interacting via
2-body delta potentials) in the infinite coupling constant limit (the so-called
Tonks-Girardeau model). This model might be relevant as a description of atomic
Bose gases confined in a one-dimensional geometry. It is known to have a
fermionic spectrum since the N-body wavefunctions have to vanish at coinciding
points, and therefore be symmetrizations of fermionic Slater wavefunctions. We
argue that in the infinite coupling constant limit the model is
indistinguishable from free fermions, i.e., all physically accessible
observables are the same as those of free fermions. Therefore, Bose-Einstein
condensate experiments at finite energy that preserve the one-dimensional
geometry cannot test any bosonic characteristic of such a model.

categories: cond-mat.stat-mech cond-mat.other hep-th physics.atom-ph


title:
Electronic zero-point oscillations in the strong-interaction limit of
  density functional theory

abstract:
  The exchange-correlation energy in Kohn-Sham density functional theory can be
expressed exactly in terms of the change in the expectation of the
electron-electron repulsion operator when, in the many-electron hamiltonian,
this same operator is multiplied by a real parameter $\lambda$ varying between
0 (Kohn-Sham system) and 1 (physical system). In this process, usually called
adiabatic connection, the one-electron density is kept fixed by a suitable
local one-body potential. The strong-interaction limit of density functional
theory, defined as the limit $\lambda\to\infty$, turns out to be, like the
opposite non-interacting Kohn-Sham limit ($\lambda\to 0$) mathematically
simpler than the physical ($\lambda=1$) case, and can be used to build an
approximate interpolation formula between $\lambda\to 0$ and $\lambda\to\infty$
for the exchange-correlation energy. Here we extend the exact treatment of the
$\lambda\to\infty$ limit [Phys. Rev. A {\bf 75}, 042511 (2007)] to the next
leading term, describing zero-point oscillations of strictly correlated
electrons, with numerical examples for small spherical atoms. We also propose
an improved approximate functional for the zero-point term and a revised
interpolation formula for the exchange-correlation energy satisfying more exact
constraints.


title: A Novel Clustering Algorithm Based on Quantum Games

abstract:
  Enormous successes have been made by quantum algorithms during the last
decade. In this paper, we combine the quantum game with the problem of data
clustering, and then develop a quantum-game-based clustering algorithm, in
which data points in a dataset are considered as players who can make decisions
and implement quantum strategies in quantum games. After each round of a
quantum game, each player's expected payoff is calculated. Later, he uses a
link-removing-and-rewiring (LRR) function to change his neighbors and adjust
the strength of links connecting to them in order to maximize his payoff.
Further, algorithms are discussed and analyzed in two cases of strategies, two
payoff matrixes and two LRR functions. Consequently, the simulation results
have demonstrated that data points in datasets are clustered reasonably and
efficiently, and the clustering algorithms have fast rates of convergence.
Moreover, the comparison with other algorithms also provides an indication of
the effectiveness of the proposed approach.

categories: cs.LG cs.AI cs.CV cs.GT cs.MA cs.NE quant-ph


title: Collective dipole excitations in sodium clusters

abstract:
  Some properties of small and medium sodium clusters are described within the
RPA approach using a projected spherical single particle basis. The oscillator
strengths calculated with a Schiff-like dipole transition operator and folded
with Lorentzian functions are used to calculate the photoabsorbtion cross
section spectra. The results are further employed to establish the dependence
of the plasmon frequency on the number of cluster components. Static electric
polarizabilities of the clusters excited in a RPA dipole state are also
calculated.
  Comparison of our results with the corresponding experimental data show an
overall good agreement.


title:
Frequency dependent deformation of liquid crystal droplets in an
  external electric field

abstract:
  Nematic drops suspended in the isotropic phase of the same substance were
subjected to alternating electrical fields of varying frequency. The system was
carefully kept in the isotropic-nematic coexistance region, which was broadened
due to small amounts of non-mesogenic additives. Whereas the droplets remained
spherical at low (order of 10 Hz) and high frequencies (in the kHz range), at
intermediate frequencies, we observed a marked flattening of the droplet in the
plane perpendicular to the applied field. The deformation of the liquid crystal
(LC) droplets occurred both in substances with positive and negative dielectric
anisotropy. The experimental data can be quantitatively modelled with a
combination of the leaky dielectric model and screening of the applied electric
field due to the finite conductivity.


title: Formation of complex films with water-soluble CTAB molecules

abstract:
  This communication reports the formation of complex Langmuir monolayer at the
air-water interface with the water-soluble -trimethyl ammonium bromide (CTAB)
molecules when interacted with the stearic acid (SA) molecules. The reaction
kinetics of the formation of the CTAB-SA complex was monitored by observing the
surface pressure versus time graph. Multilayered LB films of this complex doped
with congo red was successfully formed onto a quartz substrate. UV-Vis
absorption and steady state fluorescence spectroscopic characteristics of this
doped LB films confirms the successful incorporation of congo red molecules in
to the CTAB-SA complex films.


title: Odd-even mass differences from self-consistent mean-field theory

abstract:
  We survey odd-even nuclear binding energy staggering using density functional
theory with several treatments of the pairing interaction including the BCS,
Hartree-Fock-Bogoliubov, and the Hartree-Fock-Bogoliubov with the Lipkin-Nogami
approximation. We calculate the second difference of binding energies and
compare with 443 measured neutron energy differences in isotope chains and 418
measured proton energy differences in isotone chains. The particle-hole part of
the energy functional is taken as the SLy4 Skyrme parametrization and the
pairing part of the functional is based on a contact interaction with possible
density dependence. An important feature of the data, reproduced by the theory,
is the sharp gap quenching at magic numbers. With the strength of the
interaction as a free parameter, the theory can reproduce the data to an rms
accuracy of about 0.25 MeV. This is slightly better than a single-parameter
phenomenological description but slightly poorer than the usual two-parameter
phenomenological form C/A^alpha . The following conclusions can be made about
the performance of common parametrization of the pairing interaction: (i) there
is a weak preference for a surface-peaked neutron-neutron pairing, which might
be attributable to many-body effects; (ii) a larger strength is required in the
proton pairing channel than in the neutron pairing channel; (iii) pairing
strengths adjusted to the well-known spherical isotope chains are too weak to
give a good overall fit to the mass differences.


title: Stars and dark matter in the spiral gravitational lens 2237+0305

abstract:
  We construct a mass model for the spiral lens galaxy 2237+0305, at redshift
z_l=0.04, based on gravitational-lensing constraints, HI rotation, and new
stellar-kinematic information, based on data taken with the ESI spectrograph on
the 10m Keck-II Telescope. High resolution rotation curves and velocity
dispersion profiles along two perpendicular directions, close to the major and
minor axes of the lens galaxy, were obtained by fitting the Mgb-Fe absorption
line region. The stellar rotation curve rises slowly and flattens at r~1.5"
(~1.1 kpc). The velocity dispersion profile is approximately flat. A
combination of photometric, kinematic and lensing information is used to
construct a mass model for the four major mass components of the system -- the
dark matter halo, disc, bulge, and bar. The best-fitting solution has a dark
matter halo with a logarithmic inner density slope of gamma=0.9+/-0.3 for
rho_DM propto r^-gamma, a bulge with M/L_B=6.6+/-0.3 Upsilon_odot, and a disc
with M/L_B =1.2+/-0.3 Upsilon_odot, in agreement with measurements of late-type
spirals. The bulge dominates support in the inner regions where the multiple
images are located and is therefore tightly constrained by the observations.
The disc is sub-maximal and contributes 45+/-11 per cent of the rotational
support of the galaxy at 2.2r_d. The halo mass is (2.0+/-0.6) x 10^12 M_odot,
and the stellar to virial mass ratio is 7.0+/-2.3 per cent, consistent with
typical galaxies of the same mass.


title:
Relations between slices and quotients of the algebraic cobordism
  spectrum

abstract:
  We prove a relative statement about the slices of the algebraic cobordism
spectrum. If the map from MGL to a certain quotient of MGL introduced by
Hopkins and Morel is the map to the zero-slice then a relative version of
Voevodsky's conjecture on the slices of MGL holds true. We outline the picture
for K-theory and rational slices.


title:
Universal scaling functions of critical Casimir forces obtained by Monte
  Carlo simulations

abstract:
  Effective Casimir forces induced by thermal fluctuations in the vicinity of
bulk critical points are studied by means of Monte Carlo simulations in
three-dimensional systems for film geometries and within the experimentally
relevant Ising and XY universality classes. Several surface universality
classes of the confining surfaces are considered, some of which are relevant
for recent experiments. A novel approach introduced previously EPL 80, 60009
(2007), based inter alia on an integration scheme of free energy differences,
is utilized to compute the universal scaling functions of the critical Casimir
forces in the critical range of temperatures above and below the bulk critical
temperature. The resulting predictions are compared with corresponding
experimental data for wetting films of fluids and with available theoretical
results.


title: A LISA Data-Analysis Primer

abstract:
  This article is an introduction for the nonpractitioner to the ideas and
issues of LISA data analysis, as reflected in the explorations and experiments
of the participants in the Mock LISA Data Challenges. In particular, I discuss
the methods and codes that have been developed for the detection and parameter
estimation of supermassive black-hole binaries, extreme mass-ratio inspirals,
and Galactic binaries.


title: About Very Perfect Numbers

abstract:
  In this short paper we prove that the square of an odd prime number cannot be
a very perfect number.


title: Thermal effects on chaotic directed transport

abstract:
  We study a chaotic ratchet system under the influence of a thermal
environment. By direct integration of the Lindblad equation we are able to
analyze its behavior for a wide range of couplings with the environment, and
for different finite temperatures. We observe that the enhancement of the
classical and quantum currents due to temperature depend strongly on the
specific properties of the system. This makes difficult to extract universal
behaviors. We have also found that there is an analogy between the effects of
the classical thermal noise and those of the finite $\hbar$ size. These results
open many possibilities for their testing and implementation in kicked BECs and
cold atoms experiments.


title:
Strong Spatial Mixing and Approximating Partition Functions of Two-State
  Spin Systems without Hard Constrains

abstract:
  We prove Gibbs distribution of two-state spin systems(also known as binary
Markov random fields) without hard constrains on a tree exhibits strong spatial
mixing(also known as strong correlation decay), under the assumption that, for
arbitrary `external field', the absolute value of `inverse temperature' is
small, or the `external field' is uniformly large or small. The first condition
on `inverse temperature' is tight if the distribution is restricted to
ferromagnetic or antiferromagnetic Ising models.
  Thanks to Weitz's self-avoiding tree, we extends the result for sparse on
average graphs, which generalizes part of the recent work of Mossel and
Sly\cite{MS08}, who proved the strong spatial mixing property for ferromagnetic
Ising model. Our proof yields a different approach, carefully exploiting the
monotonicity of local recursion. To our best knowledge, the second condition of
`external field' for strong spatial mixing in this paper is first considered
and stated in term of `maximum average degree' and `interaction energy'. As an
application, we present an FPTAS for partition functions of two-state spin
models without hard constrains under the above assumptions in a general family
of graphs including interesting bounded degree graphs.


title: Rising time of entanglement between scattering spins

abstract:
  We investigate the time evolution of entanglement in a process where a mobile
particle is scattered by static spins. We show that entanglement increases
monotonically during a transient and then saturates to a steady-state value.
For a quasi-monochromatic mobile particle, the transient time depends only on
the group-velocity and width of the incoming wavepacket and is insensitive to
the interaction strength and spin-number of the scattering particles. These
features do not depend on the interaction model and can be seen in various
physical settings.


title: Unipotent elements in small characteristic, III

abstract:
  We give a uniform description of the decomposition of the unipotent variety
of a classical group in arbitrary characteristic into pieces (considered in a
non-uniform way in the earlier parts of this paper).


title: Jet substructure at HERA

abstract:
  A review is presented of jet substructure measurements from the H1 and ZEUS
Collaborations at HERA. The results presented include tests of perturbative
QCD, comparison of the properties of quark and gluon jets, the comparison of
the pattern of QCD radiation in different hard scattering processes,
determination of the strong coupling and studies of the underlying subprocesses
dynamics and of the pattern of parton radiation.


title: Couplers for Non-Locality Swapping

abstract:
  Studying generalized non-local theories brings insight to the foundations of
quantum mechanics. Here we focus on non-locality swapping, the analogue of
quantum entanglement swapping. In order to implement such a protocol, one needs
a coupler that performs the equivalent of quantum joint measurements on
generalized `box-like' states. Establishing a connection to Bell inequalities,
we define consistent couplers for theories containing an arbitrary amount of
non-locality, which leads us to introduce the concepts of perfect and minimal
couplers. Remarkably, Tsirelson's bound for quantum non-locality naturally
appears in our study.


title: A new Contrast Based Image Fusion using Wavelet Packets

abstract:
  Image Fusion, a technique which combines complimentary information from
different images of the same scene so that the fused image is more suitable for
segmentation, feature extraction, object recognition and Human Visual System.
In this paper, a simple yet efficient algorithm is presented based on contrast
using wavelet packet decomposition. First, all the source images are decomposed
into low and high frequency sub-bands and then fusion of high frequency
sub-bands is done by the means of Directive Contrast. Now, inverse wavelet
packet transform is performed to reconstruct the fused image. The performance
of the algorithm is carried out by the comparison made between proposed and
existing algorithm.


title:
EVN observations of the Ultra Luminous Infrared Galaxies IRAS 23365+3604
  and IRAS 07251-0248

abstract:
  We present high-sensitivity, high-resolution images of the Ultraluminous
Infrared Galaxies (ULIRG; L$_{\mathrm{FIR}} > 10^{12}$ L$_\odot$) IRAS
23365+3604 and IRAS 07251-0248, taken with the EVN at 6 and 18 cm. The images
show a large number of compact components, whose luminosities are typical of
Type IIL and Type IIn Radio Supernovae (RSNe). Further observations of these
ULIRGs will allow us to confirm, or to rule out, their nature. The present
observations are part of a project that should result in a significant number
of SN detections, providing a direct measurement of the Core Collapse Superova
(CCSN) rate and allowing us to estimate the Star Formation Rate (SFR) in our
sample of ULIRGs .


title: Option Pricing Model Based on a Markov-modulated Diffusion with Jumps

abstract:
  The paper proposes a class of financial market models which are based on
inhomogeneous telegraph processes and jump diffusions with alternating
volatilities. It is assumed that the jumps occur when the tendencies and
volatilities are switching. We argue that such a model captures well the stock
price dynamics under periodic financial cycles. The distribution of this
process is described in detail. For this model we obtain the structure of the
set of martingale measures. This incomplete model can be completed by adding
another asset based on the same sources of randomness. Explicit closed-form
formulae for prices of the standard European options are obtained for the
completed market model.


title: A Trigger and Readout Scheme for future Cherenkov Telescope Arrays

abstract:
  The next generation of ground-based gamma-ray observatories, such as e.g.
CTA, will consist of about 50-100 telescopes, and cameras with in total ~100000
to ~200000 channels. The telescopes of the core array will cover and effective
area of ~ 1 km2 and will be possibly accompanied by a large halo of smaller
telescopes spread over about 10 km2 . In order to make maximum use of the
stereoscopic approach, a very flexible inter-telescope trigger scheme is needed
which allows to couple telescopes that located up to ~1 km apart. The
development of a cost effective readout scheme for the camera signals exhibits
a major technological challenge. Here we present ideas on a new asynchronous
inter-telescope trigger scheme, and a very cost-effective, high-bandwidth
frontend to backend data transfer system, both based on standard Ethernet
components and an Ethernet front-end interface based on mass production
standard FPGAs.


title: Distilling entanglement from Fermions

abstract:
  Since Fermions are based on anti-commutation relations, their entanglement
can not be studied in the usual way, such that the available theory has to be
modified appropriately. Recent publications consider in particular the
structure of separable and of maximally entangled states. In this talk we want
to discuss local operations and entanglement distillation from bipartite,
Fermionic systems. To this end we apply an algebraic point of view where
algebras of local observables, rather than tensor product Hilbert spaces play
the central role. We apply our scheme in particular to Fermionic Gaussian
states where the whole discussion can be reduced to properties of the
covariance matrix. Finally the results are demonstrated with free Fermions on
an infinite, one-dimensional lattice.


title: Eulerian quasisymmetric functions

abstract:
  We introduce a family of quasisymmetric functions called {\em Eulerian
quasisymmetric functions}, which specialize to enumerators for the joint
distribution of the permutation statistics, major index and excedance number on
permutations of fixed cycle type. This family is analogous to a family of
quasisymmetric functions that Gessel and Reutenauer used to study the joint
distribution of major index and descent number on permutations of fixed cycle
type. Our central result is a formula for the generating function for the
Eulerian quasisymmetric functions, which specializes to a new and surprising
$q$-analog of a classical formula of Euler for the exponential generating
function of the Eulerian polynomials. This $q$-analog computes the joint
distribution of excedance number and major index, the only of the four
important Euler-Mahonian distributions that had not yet been computed. Our
study of the Eulerian quasisymmetric functions also yields results that include
the descent statistic and refine results of Gessel and Reutenauer. We also
obtain $q$-analogs, $(q,p)$-analogs and quasisymmetric function analogs of
classical results on the symmetry and unimodality of the Eulerian polynomials.
Our Eulerian quasisymmetric functions refine symmetric functions that have
occurred in various representation theoretic and enumerative contexts including
MacMahon's study of multiset derangements, work of Procesi and Stanley on toric
varieties of Coxeter complexes, Stanley's work on chromatic symmetric
functions, and the work of the authors on the homology of a certain poset
introduced by Bj\"orner and Welker.


title:
Some hints for the design of digital chaos-based cryptosystems: lessons
  learned from cryptanalysis

abstract:
  In this work we comment some conclusions derived from the analysis of recent
proposals on the field of chaos-based cryptography. These observations remark
the main problems detected in some of those schemes under examination.
Therefore, this paper is a list of what to avoid when considering chaos as
source of new strategies to conceal and protect information.


title:
INTEGRAL observation of hard X-ray variability of the TeV binary LS5039
  / RX J1826.2-1450

abstract:
  LS 5039/RX J1826.2-1450 is one of the few High Mass X-ray binary systems from
which radio and high energy TeV emission has been observed. Moreover,
variability of the TeV emission with orbital period was detected.
  We investigate the hard X-ray (25 - 200keV) spectral and timing properties of
the source with the monitoring IBIS/ISGRI instrument on-board the INTEGRAL
satellite.
  We present the analysis of INTEGRAL observations for a total of about 3 Msec
exposure time, including both public data and data from the Key Programme. We
search for flux and spectral variability related to the orbital phase.
  The source is observed to emit from 25 up to 200 keV and the emission is
concentrated around inferior conjunction. Orbital variability in the hard X-ray
band is detected and established to be in phase with the orbitally modulated
TeV emission observed with H.E.S.S. For this energy range we determine an
average flux for the inferior conjunction phase interval of $(3.54 \pm 2.30)
\times 10^{-11}$ erg cm$^{-2}$ s$^{-1}$, and a flux upper limit for the
superior conjunction phase interval of $1.45 \times 10^{-11}$ erg cm$^{-2}$
s$^{-1}$ (90% conf. level respectively). The spectrum for the inferior
conjunction phase interval follows a power law with an index $\Gamma =
2.0^{+0.2}_{-0.2} $ (90% conf. level).


title: Cyclic Homologies of Crossed Modules of Algebras

abstract:
  The Hochschild and (cotriple) cyclic homologies of crossed modules of
(not-necessarily-unital) associative algebras are investigated. Wodzicki's
excision theorem is extended for inclusion crossed modules in the category of
crossed modules of algebras. The cyclic and cotriple cyclic homologies of
crossed modules are compared in terms of long exact homology sequence,
generalising the relative cyclic homology exact sequence.


title:
Highly Sensitive Gamma-Spectrometers of GERDA for Material Screening:
  Part 2

abstract:
  The previous article about material screening for GERDA points out the
importance of strict material screening and selection for radioimpurities as a
key to meet the aspired background levels of the GERDA experiment. This is
directly done using low-level gamma-spectroscopy. In order to provide
sufficient selective power in the mBq/kg range and below, the employed
gamma-spectrometers themselves have to meet strict material requirements, and
make use of an elaborate shielding system. This article gives an account of the
setup of two such spectrometers. Corrado is located in a depth of 15 m w.e. at
the MPI-K in Heidelberg (Germany), GeMPI III is situated at the Gran-Sasso
underground laboratory at 3500 m w.e. (Italy). The latter one aims at detecting
sample activities of the order ~0.01 mBq/kg, which is the current
state-of-the-art level. The applied techniques to meet the respective needs are
discussed and demonstrated by experimental results.


title:
Biased Dark Energy Constraints from Neglecting Reduced Shear in Weak
  Lensing Surveys

abstract:
  The weak gravitational lensing of distant galaxies by large-scale structure
is expected to become a powerful probe of dark energy. By measuring the
ellipticities of large numbers of background galaxies, the subtle gravitational
distortion called "cosmic shear" can be measured and used to constrain dark
energy parameters. The observed galaxy ellipticities, however, are induced not
by shear but by reduced shear, which also accounts for slight magnifications of
the images. This distinction is negligible for present weak lensing surveys,
but it will become more important as we improve our ability to measure and
understand small-angle cosmic shear modes. I calculate the discrepancy between
shear and reduced shear in the context of power spectra and cross spectra,
finding the difference could be as high as 10% on the smallest accessible
angular scales. I estimate how this difference will bias dark energy parameters
obtained from two weak lensing methods: weak lensing tomography and the shear
ratio method known as offset-linear scaling. For weak lensing tomography,
ignoring the effects of reduced shear will cause future surveys considered by
the Dark Energy Task Force to measure dark energy parameters that are biased by
amounts comparable to their error bars. I advocate that reduced shear be
properly accounted for in such surveys, and I provide a semi-analytic formula
for doing so. Since reduced shear cross spectra do not follow an offset-linear
scaling relation, the shear ratio method is similarly biased but with smaller
significance.


title: The MC@NLO 3.4 Event Generator

abstract:
  This is the user's manual of MC@NLO 3.4. This package is a practical
implementation, based upon the HERWIG event generator, of the MC@NLO formalism,
which allows one to incorporate NLO QCD matrix elements consistently into a
parton shower framework. Processes available in this version include the
hadroproduction of single vector and Higgs bosons, vector boson pairs, heavy
quark pairs, single top, single top in association with a W, lepton pairs, and
Higgs bosons in association with a W or Z. Spin correlations are included for
all processes except ZZ and WZ production. This document is self-contained, but
we emphasise the main differences with respect to previous versions.


title:
Cross Sections and Beam Asymmetries for K+ Sigma*- photoproduction from
  the deuteron at 1.5-2.4 GeV

abstract:
  The $\Sigma(1385)$ resonance, or $\Sigma^*$, is well-known as part of the
standard baryon decuplet with spin $J=3/2$. Measurements of the reaction
$\gamma p \to K^+ \Sigma^{*0}$ are difficult to extract due to overlap with the
nearby $\Lambda(1405)$ resonance. However, the reaction $\gamma n \to K^+
\Sigma^{*-}$ has no overlap with the $\Lambda(1405)$ due to its charge. Here we
report the first measurement of cross sections and beam asymmetries for
photoproduction of the \sigs from a deuteron target. % where the $K^+$ and
$\pi^-$ are detected in the LEPS spectrometer. The cross sections at forward
angles range from 0.4 to 1.2 $\mu$b, with a broad maximum near $E_\gamma \simeq
1.8$ GeV. The beam asymmetries are negative, in contrast to postive values for
the $\gamma n \to K^+\Sigma^-$ reaction.