title: On Level-Raising Congruences

abstract:
  A work of Sorensen is rewritten here to include nontrivial types at the
infinite places. This extends results of K. Ribet and R. Taylor on
level-raising for algebraic modular forms on D^{\times}, where D is a definite
quaternion algebra over a totally real field F. This is done for any
automorphic representations \pi of an arbitrary reductive group G over F which
is compact at infinity. It is not assumed that \pi_\infty is trivial. If
\lambda is a finite place of \bar{\Q}, and w is a place where \pi_w is
unramified and \pi_w is congruent to the trivial representation mod \lambda,
then under some mild additional assumptions (relaxing requirements on the
relation between w and \ell which appear in previous works) the existence of a
\tilde{\pi} congruent to \pi mod \lambda such that \tilde{\pi}_w has more
parahoric fixed vectors than \pi_w, is proven. In the case where G_w has
semisimple rank one, results of Clozel, Bellaiche and Graftieaux according to
which \tilde{\pi}_w is Steinberg, are sharpened. To provide applications of the
main theorem two examples over F of rank greater than one are considered. In
the first example G is taken to be a unitary group in three variables and a
split place w. In the second G is taken to be an inner form of GSp(2). In both
cases, precise satisfiable conditions on a split prime w guaranteeing the
existence of a \tilde{\pi} congruent to \pi mod \lambda such that the component
\tilde{\pi}_w is generic and Iwahori spherical, are obtained. For symplectic G,
to conclude that \tilde{\pi}_w is generic, computations of R. Schmidt are used.
In particular, if \pi is of Saito-Kurokawa type, it is congruent to a
\tilde{\pi} which is not of Saito-Kurokawa type.


title:
Grapham: Graphical Models with Adaptive Random Walk Metropolis
  Algorithms

abstract:
  Recently developed adaptive Markov chain Monte Carlo (MCMC) methods have been
applied successfully to many problems in Bayesian statistics. Grapham is a new
open source implementation covering several such methods, with emphasis on
graphical models for directed acyclic graphs. The implemented algorithms
include the seminal Adaptive Metropolis algorithm adjusting the proposal
covariance according to the history of the chain and a Metropolis algorithm
adjusting the proposal scale based on the observed acceptance probability.
Different variants of the algorithms allow one, for example, to use these two
algorithms together, employ delayed rejection and adjust several parameters of
the algorithms. The implemented Metropolis-within-Gibbs update allows arbitrary
sampling blocks. The software is written in C and uses a simple extension
language Lua in configuration.


title:
Collapsing Hot Molecular Cores: A Model for the Dust Spectrum and
  Ammonia Line Emission of the G31.41+0.31 Hot Core

abstract:
  We present a model aimed to reproduce the observed spectral energy
distribution (SED) as well as the ammonia line emission of the G31.41+0.31 hot
core. The core is modeled as an infalling envelope onto a massive star that is
undergoing an intense accretion phase. We assume an envelope with a density and
velocity structure resulting from the dynamical collapse of a singular
logatropic sphere. The stellar and envelope physical properties are determined
by fitting the SED. From these physical conditions, the ammonia line emission
is calculated and compared with subarcsecond resolution VLA data of the (4,4)
transition. The only free parameter in this line fitting is the ammonia
abundance. The observed properties of the NH3(4,4) lines and their spatial
distribution can be well reproduced provided it is taken into account the steep
increase of the abundance in the hotter (> 100 K), inner regions of the core
produced by the sublimation of icy mantles where ammonia molecules are trapped.
The model predictions for the (2,2), (4,4), and (5,5) transitions are also in
reasonably agreement with the single-dish spectra available in the literature.
The best fit is obtained for a model with a star of 25 Msun, a mass accretion
rate of 0.003 Msun/yr, and a total luminosity of 200,000 Lsun. The gas-phase
ammonia abundance ranges from 2 \times 10^{-8} in the outer region to 3 \times
10^{-6} in the inner region. To our knowledge, this is the first time that the
dust and molecular line data of a hot molecular core, including subarcsecond
resolution data that spatially resolve the structure of the core, have been
simultaneously explained by a physically self-consistent model. This modeling
shows that massive protostars are able to excite high excitation ammonia
transitions up to the outer edge (30,000 AU) of the large scale envelope.


title:
{\Large $\gamma$} induced multiparticle emissions of medium mass nuclei
  at intermediate energies

abstract:
  A comprehensive analysis of multiparticle emissions following photon induced
reactions at intermediate energies is provided. Photon induced reaction is
described in the energy range of $\sim 30-140$ MeV with an approach based on
the quasideuteron nuclear photoabsorption model followed by the process of
competition between light particle evaporation and fission for the excited
nucleus. The evaporation-fission process of the compound nucleus is simulated
in a Monte-Carlo framework. The study shows almost no fission events for the
medium mass nuclei and reproduces satisfactorily well the available
experimental data of photonuclear reaction cross sections at energies $\sim
30-140$ MeV.


title:
Electric-dipole active two-magnon excitation in {\textit{ab}} spiral
  spin phase of a ferroelectric magnet
  Gd$_{\textbf{0.7}}$Tb$_{\textbf{0.3}}$MnO$_{\textbf 3}$

abstract:
  A broad continuum-like spin excitation (1--10 meV) with a peak structure
around 2.4 meV has been observed in the ferroelectric $ab$ spiral spin phase of
Gd$_{0.7}$Tb$_{0.3}$MnO$_3$ by using terahertz (THz) time-domain spectroscopy.
Based on a complete set of light-polarization measurements, we identify the
spin excitation active for the light $E$ vector only along the a-axis, which
grows in intensity with lowering temperature even from above the magnetic
ordering temperature but disappears upon the transition to the $A$-type
antiferromagnetic phase. Such an electric-dipole active spin excitation as
observed at THz frequencies can be ascribed to the two-magnon excitation in
terms of the unique polarization selection rule in a variety of the
magnetically ordered phases.


title:
Etching-dependent reproducible memory switching in vertical SiO2
  structures

abstract:
  Vertical structures of SiO$_{2}$ sandwiched between a top tungsten electrode
and conducting non-metal substrate were fabricated by dry and wet etching
methods. Both structures exhibit similar voltage-controlled memory behaviors,
in which short voltage pulses (1 $\mu$s) can switch the devices between high-
and low-impedance states. Through the comparison of current-voltage
characteristics in structures made by different methods, filamentary conduction
at the etched oxide edges is most consistent with the results, providing
insights into similar behaviors in metal/SiO/metal systems. High ON/OFF ratios
of over 10$^{4}$ were demonstrated.


title:
On a q-extension of Mehta's eigenvectors of the finite Fourier transform
  for q a root of unity

abstract:
  It is shown that the continuous q-Hermite polynomials for q a root of unity
have simple transformation properties with respect to the classical Fourier
transform. This result is then used to construct q-extended eigenvectors of the
finite Fourier transform in terms of these polynomials.


title: Decomposing locally compact groups into simple pieces

abstract:
  We present a contribution to the structure theory of locally compact groups.
The emphasis is on compactly generated locally compact groups which admit no
infinite discrete quotient. It is shown that such a group possesses a
characteristic cocompact subgroup which is either connected or admits a
non-compact non-discrete topologically simple quotient. We also provide a
description of characteristically simple groups and of groups all of whose
proper quotients are compact. We show that Noetherian locally compact groups
without infinite discrete quotient admit a subnormal series with all
subquotients compact, compactly generated Abelian, or compactly generated
topologically simple. Two appendices introduce results and examples around the
concept of quasi-product.


title: Stability of Fractional-Order Systems with Rational Orders

abstract:
  This paper deals with stability of a certain class of fractional order linear
and nonlinear systems. The stability is investigated in the time domain and the
frequency domain. The general stability conditions and several illustrative
examples are presented as well.


title:
Reconstructing the potentials for the quintessence and tachyon dark
  energy, from the holographic principle

abstract:
  We propose an holographic quintessence and tachyon models of dark energy. The
correspondence between the quintessence and tachyon energy densities with the
holographic density, allows the reconstruction of the potentials and the
dynamics for the quintessence and tachyon fields, in flat FRW background. The
proposed infrared cut-off for the holographic energy density works for two
cases of the constant $\alpha$: for $\alpha<1$ we reconstructed the holographic
quintessence model in the region before the $\omega=-1$ crossing for the EoS
parameter. The cosmological dynamics for $\alpha>1$ was also reconstructed for
the holographic quintessence and tachyon models.


title:
Spin-orbital frustrations and anomalous metallic state in iron-pnictide
  superconductors

abstract:
  We develop an understanding of the anomalous metal state of the parent
compounds of recently discovered iron based superconductors starting from a
strong coupling viewpoint, including orbital degrees of freedom. On the basis
of an intermediate-spin (S=1) state for the Fe^{2+} ions, we derive a
Kugel-Khomskii spin-orbital Hamiltonian for the active t_{2g} orbitals. It
turns out to be a highly complex model with frustrated spin and orbital
interactions. We compute its classical phase diagrams and provide an
understanding for the stability of the various phases by investigating its
spin-only and orbital-only limits. The experimentally observed spin-stripe
state is found to be stable over a wide regime of physical parameters and can
be accompanied by three different types of orbital orders. Of these the
orbital-ferro and orbital-stripe orders are particularly interesting since they
break the in-plane lattice symmetry -- a robust feature of the undoped
compounds. We compute the magnetic excitation spectra for the effective spin
Hamiltonian, observing a strong reduction of the ordered moment, and point out
that the proposed orbital ordering pattern can be measured in resonant X-ray
diffraction.


title:
Unexpected features of quantum degeneracies in a pairing model with two
  integrable limits

abstract:
  The evolution pattern of level crossings and exceptional points is studied in
a non-integrable pairing model with two different integrable limits. One of the
integrable limits has two independent parameter-dependent integrals of motion.
We demonstrate, and illustrate in our model, that quantum integrability of a
system with more than one parameter-dependent integral of motion is always
signaled by level crossings of a complex-extended Hamiltonian. We also find
that integrability implies a reduced number of exceptional points. Both
properties could uniquely characterize quantum integrability in small Hilbert
spaces.


title: Does dark matter consist of baryons of new stable family quarks?

abstract:
  We investigate the possibility that the dark matter consists of clusters of
the heavy family quarks and leptons with zero Yukawa couplings to the lower
families. Such a family is predicted by the {\it approach unifying spin and
charges} as the fifth family. We make a rough estimation of properties of
baryons of this new family members, of their behaviour during the evolution of
the universe and when scattering on the ordinary matter and study possible
limitations on the family properties due to the cosmological and direct
experimental evidences.


title: Bilinear Forms on the Dirichlet Space

abstract:
  Let $\mathcal{D}$ be the classical Dirichlet space, the Hilbert space of
holomorphic functions on the disk. Given a holomorphic symbol function $b$ we
define the associated Hankel type bilinear form, initially for polynomials f
and g, by $T_{b}(f,g):= < fg,b >_{\mathcal{D}} $, where we are looking at the
inner product in the space $\mathcal{D}$.
  We let the norm of $T_{b}$ denotes its norm as a bilinear map from
$\mathcal{D}\times\mathcal{D}$ to the complex numbers. We say a function $b$ is
in the space $\mathcal{X}$ if the measure $d\mu_{b}:=| b^{\prime}(z)| ^{2}dA$
is a Carleson measure for $\mathcal{D}$ and norm $\mathcal{X}$ by $$ \Vert
b\Vert_{\mathcal{X}}:=| b(0)| +\Vert | b^{\prime}(z)|
^{2}dA\Vert_{CM(\mathcal{D})}^{1/2}. $$
  Our main result is $T_{b}$ is bounded if and only if $b\in\mathcal{X}$ and $$
\Vert T_{b}\Vert_{\mathcal{D\times D}}\approx\Vert b\Vert_{\mathcal{X}}. $$


title:
Hall detection of time-reversal symmetry breaking under AC electric driv
  ing

abstract:
  In a four terminal sample microscopic time-reversibility leads to symmetry
relations between resistance measurements where the role of current and voltage
leads are exchanged. These reciprocity relations are a manifestation of general
Onsager-Casimir symmetries in equilibrium systems. We investigate
experimentally the validity of time reversal symmetry in a
$GaAs/Ga_{1-x}Al_xAs$ Hall bar irradiated by an external AC field, at zero
magnetic field. For inhomogeneous AC fields we find strong deviations from
reciprocity relations and show that their origin can be understood from the the
billiard model of a Hall junction. Under homogeneous irradiation the symmetry
is more robust, indicating that time-reversal symmetry is preserved.


title: Regularity of the Einstein Equations at Future Null Infinity

abstract:
  When Einstein's equations for an asymptotically flat, vacuum spacetime are
reexpressed in terms of an appropriate conformal metric that is regular at
(future) null infinity, they develop apparently singular terms in the
associated conformal factor and thus appear to be ill-behaved at this
(exterior) boundary. In this article however we show, through an enforcement of
the Hamiltonian and momentum constraints to the needed order in a Taylor
expansion, that these apparently singular terms are not only regular at the
boundary but can in fact be explicitly evaluated there in terms of conformally
regular geometric data. Though we employ a rather rigidly constrained and gauge
fixed formulation of the field equations, we discuss the extent to which we
expect our results to have a more 'universal' significance and, in particular,
to be applicable, after minor modifications, to alternative formulations.


title: Search for neutrino point sources with IceCube 22-strings

abstract:
  The IceCube detector took data in its 22-string configuration in 2007-2008.
This data has been analyzed to search for extraterrestrial point sources of
neutrinos using several methods. Two main methods are discussed and compared
here: the binned and the unbinned maximum likelihood method. The best
sky-averaged sensitivity (90% C.L.) is E^2 Phi_nu_mu=1.3 10^-11 TeVcm^-2s^-1 to
a generic E^-2 flux of nu_mu over the energy range from 3 TeV to 3 PeV. No
neutrino point sources are found from the individual directions of a
pre-selected catalogue nor in a search extended to the northern sky. Limits are
improved by a factor of two compared to the total statistics collected with the
AMANDA-II detector and represent the best results to date.


title:
Coexistence of Itinerant Electrons and Local Moments in Iron-Based
  Superconductors

abstract:
  In view of the recent experimental facts in the iron-pnictides, we make a
proposal that the itinerant electrons and local moments are simultaneously
present in such multiband materials. We study a minimal model composed of
coupled itinerant electrons and local moments to illustrate how a consistent
explanation of the experimental measurements can be obtained in the leading
order approximation. In this mean-field approach, the spin-density-wave (SDW)
order and superconducting pairing of the itinerant electrons are not directly
driven by the Fermi surface nesting, but are mainly induced by their coupling
to the local moments. The presence of the local moments as independent degrees
of freedom naturally provides strong pairing strength for superconductivity and
also explains the normal-state linear-temperature magnetic susceptibility above
the SDW transition temperature. We show that this simple model is supported by
various anomalous magnetic properties and isotope effect which are in
quantitative agreement with experiments.


title: A non-periodic and two-dimensional example of elliptic homogenization

abstract:
  The focus in this paper is on elliptic homogenization of a certain kind of
possibly non-periodic problems. A non-periodic and two-dimensional example is
studied, where we numerically illustrate the homogenized matrix.


title:
JaxoDraw: A graphical user interface for drawing Feynman diagrams.
  Version 2.0 release notes

abstract:
  A new version of the Feynman graph plotting tool JaxoDraw is presented.
Version 2.0 is a fundamental re-write of most of the JaxoDraw core and some
functionalities, in particular importing graphs, are not backward-compatible
with the 1.x branch. The most prominent new features include: drawing of Bezier
curves for all particle modes, on-the-fly update of edited objects, multiple
undo/redo functionality, the addition of a plugin infrastructure, and a general
improved memory performance. A new LaTeX style file is presented that has been
written specifically on top of the original axodraw.sty to meet the needs of
this this new version.


title: Abundances of massive stars: some recent developments

abstract:
  Thanks to their usefulness in various fields of astrophysics (e.g. mixing
processes in stars, chemical evolution of galaxies), the last few years have
witnessed a large increase in the amount of abundance data for early-type
stars. Two intriguing results emerging since the last reviews on this topic
will be discussed: (a) nearby OB stars exhibit metal abundances generally lower
than the solar/meteoritic estimates; (b) evolutionary models of single objects
including rotation are largely unsuccessful in explaining the CNO properties of
stars in the Galaxy and in the Magellanic clouds.


title:
A possible experimental check of the uncertainty relations by means of
  homodyne measuring photon quadrature

abstract:
  We suggest to use the photon homodyne detection experimental data for
checking the Heisenberg and Schr\"{o}dinger-Robertson uncertainty relations, by
means of measuring optical tomograms of the photon quantum states.


title: Trial Wavefunctions for \nu = 1/2 + 1/2 Quantum Hall Bilayers

abstract:
  Quantum Hall bilayer systems at filling fractions near \nu = 1/2 + 1/2
undergo a transition from a compressible phase with strong intralayer
correlation to an incompressible phase with strong interlayer correlations as
the layer separation d is reduced below some critical value. Deep in the
intralayer phase (large separation) the system can be interpreted as a fluid of
composite fermions (CFs), whereas deep in the interlayer phase (small
separation) the system can be interpreted as a fluid of composite bosons (CBs).
The focus of this paper is to understand the states that occur for intermediate
layer separation by using trial variational wavefunctions. We consider two main
classes of wavefunctions. In the first class, previously introduced by Moller
et al. [PRL {\bf 101}, 176803 (2008)], we consider interlayer BCS pairing of
two independent CF liquids. We find that these wavefunctions are exceedingly
good for d >~ \ell_0 with \ell_0 the magnetic length. The second class of
wavefunctions naturally follows the reasoning of Simon et al. [PRL {\bf 91},
046803 (2003)] and generalizes the idea of pairing wavefunctions by allowing
the CFs also to be replaced continuously by CBs. This generalization allows us
to construct exceedingly good wavefunctions for interlayer spacings of d <~
\ell_0, as well. The accuracy of the wavefunctions discussed in this work,
compared with exact diagonalization, approaches that of the celebrated Laughlin
wavefunction.


title:
Coulomb correlations evidenced in the magneto-optical spectra of charged
  excitons in semiconductor quantum dots

abstract:
  The emission spectral pattern of a charged exciton in a semiconductor quantum
dot is composed of a quadruplet of linearly polarized lines in the presence of
a magnetic field oriented perpendicularly to the direction of the photon
momentum. By measuring the Zeeman splittings, we obtain the effective g factors
of the carriers and find that the hole g factor is very sensitive to the QD
shape asymmetry. By comparing the effective g factors obtained for the neutral
and the charged excitons in the same quantum dot, we uncover the role of
Coulomb correlations in these excitonic states.


title:
The quantum-mechanical basis of an extended Landau-Lifshitz-Gilbert
  equation for a current-carrying ferromagnetic wire

abstract:
  An extended Landau-Lifshitz-Gilbert (LLG) equation is introduced to describe
the dynamics of inhomogeneous magnetization in a current-carrying wire. The
coefficients of all the terms in this equation are calculated
quantum-mechanically for a simple model which includes impurity scattering.
This is done by comparing the energies and lifetimes of a spin wave calculated
from the LLG equation and from the explicit model. Two terms are of particular
importance since they describe non-adiabatic spin-transfer torque and damping
processes which do not rely on spin-orbit coupling. It is shown that these
terms may have a significant influence on the velocity of a current-driven
domain wall and they become dominant in the case of a narrow wall.


title:
Inclusive Heavy Flavor Hadroproduction in NLO QCD: the Exact Analytic
  Result

abstract:
  We present the first exact analytic result for all partonic channels
contributing to the total cross section for the production of a pair of heavy
flavors in hadronic collisions in NLO QCD. Our calculation is an essential step
in the derivation of the top quark pair production cross section at NNLO in
QCD, which is a cornerstone of the precision LHC program. Our results uncover
the analytical structures behind observables with heavy flavors at higher
orders. They also reveal surprising and non-trivial implications for kinematics
close to partonic threshold.


title: GEMs with Double Layred Micropattern Electrodes and their Applications

abstract:
  We have developed and tested several new designs of GEM detectors with
micropattern electrodes manufactured by microelectronic technology. In one
design, the inner layer of the detector electrode consists of thin metallic
strips and the outer layer is made of a resistive grid manufactured by a screen
printing technology. In other designs, the electrodes were made of metallic
strips fed by HV via micro-resistors manufactured by a screen printing
technology. Due to these features, the new detectors have several important
advantages over conventional GEMs or ordinary thick GEMs. For example, the
resistive grid (in the first design) and the screen printed resistors (in other
designs) limited the current in case of discharges, making these detectors
intrinsically spark-protected.
  We will here describe our tests with the photosensitive versions of these
detectors (coated with CsI layers) and the efforts of implementing them in
several applications. In particular, we will focus on our activity towards the
ALICE RICH detector upgrade and on tests of simplified prototypes of cryogenic
dark matter detectors.


title: String Art: Circle Drawing Using Straight Lines

abstract:
  An algorithm to generate the locus of a circle using the intersection points
of straight lines is proposed. The pixels on the circle are plotted independent
of one another and the operations involved in finding the locus of the circle
from the intersection of straight lines are parallelizable. Integer only
arithmetic and algorithmic optimizations are used for speedup. The proposed
algorithm makes use of an envelope to form a parabolic arc which is consequent
transformed into a circle. The use of parabolic arcs for the transformation
results in higher pixel errors as the radius of the circle to be drawn
increases. At its current state, the algorithm presented may be suitable only
for generating circles for string art.


title: Invariant Prolongation of BGG-Operators in Conformal Geometry

abstract:
  BGG-operators form sequences of invariant differential operators and the
first of these is overdetermined. Interesting equations in conformal geometry
described by these operators are those for Einstein scales, conformal Killing
forms and conformal Killing tensors. We present a deformation procedure of the
tractor connection which yields an invariant prolongation of the first
operator. The explicit calculation is presented in the case of conformal
Killing forms.


title: Nonadiabatic transitions in electrostatically trapped ammonia molecules

abstract:
  Nonadiabatic transitions are known to be major loss channels for atoms in
magnetic traps, but have thus far not been experimentally reported upon for
trapped molecules. We have observed and quantified losses due to nonadiabatic
transitions for three isotopologues of ammonia in electrostatic traps, by
comparing the trapping times in traps with a zero and a non-zero electric field
at the center. Nonadiabatic transitions are seen to dominate the overall loss
rate even for samples at relatively high temperatures of 10-50 mK.


title: Parabolic equations with variably partially VMO coefficients

abstract:
  We prove the $W^{1,2}_{p}$-solvability of second order parabolic equations in
nondivergence form in the whole space for $p\in (1,\infty)$. The leading
coefficients are assumed to be measurable in one spatial direction and have
vanishing mean oscillation (VMO) in the orthogonal directions and the time
variable in each small parabolic cylinder with the direction depending on the
cylinder. This extends a recent result by Krylov [17] for elliptic equations
and removes the restriction that $p>2$.


title:
Anisotropic profiles in the spin polarization of multichannel
  semiconductor rings with Rashba spin orbit coupling

abstract:
  We investigate the spin accumulation effect in eccentric semiconductor
multichannel rings with Rashba spin-orbit interaction and threaded by a
magnetic flux. Due to the finite eccentricity, the spin polarization induced at
the borders of the sample is anisotropic and exhibits different patterns and
intensities at specific angular directions. This effect, reminiscent of the
spin polarization drift induced by the application of an in plane electric
field, could be used to manipulate and functionalize the spin polarization in
electronic nanorings.


title: Cooling and aggregation in wet granulates

abstract:
  Wet granular materials are characterized by a defined bond energy in their
particle interaction such that breaking a bond implies an irreversible loss of
a fixed amount of energy. Associated with the bond energy is a nonequilibrium
transition, setting in as the granular temperature falls below the bond energy.
The subsequent aggregation of particles into clusters is shown to be a
self-similar growth process with a cluster size distribution that obeys
scaling. In the early phase of aggregation the clusters are fractals with
D_f=2, for later times we observe gelation. We use simple scaling arguments to
derive the temperature decay in the early and late stages of cooling and verify
our results with event-driven simulations.


title:
Adiabatic Magnetization of Superconductors as a High-Performance Cooling
  Mechanism

abstract:
  The adiabatic magnetization of a superconductor is a cooling principle
proposed in the 30s, which has never been exploited up to now. Here we present
a detailed dynamic description of the effect, computing the achievable final
temperatures as well as the process timescales for different superconductors in
various regimes. We show that, although in the experimental conditions explored
so far the method is in fact inefficient, a suitable choice of initial
temperatures and metals can lead to unexpectedly large cooling effect, even in
the presence of dissipative phenomena. Our results suggest that this principle
can be re-envisaged today as a performing refrigeration method to access the
microK regime in nanodevices.


title: Spectral triples and the super-Virasoro algebra

abstract:
  We construct infinite dimensional spectral triples associated with
representations of the super-Virasoro algebra. In particular the irreducible,
unitary positive energy representation of the Ramond algebra with central
charge c and minimal lowest weight h=c/24 is graded and gives rise to a net of
even theta-summable spectral triples with non-zero Fredholm index. The
irreducible unitary positive energy representations of the Neveu-Schwarz
algebra give rise to nets of even theta-summable generalised spectral triples
where there is no Dirac operator but only a superderivation.


title: Consistent Loop Quantum Cosmology

abstract:
  A consistent combination of quantum geometry effects rules out a large class
of models of loop quantum cosmology and their critical densities as they have
been used in the recent literature. In particular, the critical density at
which an isotropic universe filled with a free, massless scalar field would
bounce must be well below the Planck density. In the presence of anisotropy, no
model of the Schwarzschild black hole interior analyzed so far is consistent.


title: One-body energy dissipation in fusion reaction from mean-field theory

abstract:
  Information on dissipation in the entrance channel of heavy-ion collisions is
extracted by macroscopic reduction procedure of Time-Dependent Hartree-Fock
theory. The method gives access to a fully microscopic description of the
friction coefficient associated with transfer of energy from the relative
motion towards intrinsic degrees of freedom. The reduced friction coefficient
exhibits a universal behavior, i.e. almost independent of systems investigated,
whose order of magnitude is comparable with the calculations based on linear
response theory. Similarly to nucleus-nucleus potential, especially close to
the Coulomb barrier, there are sizable dynamical effects on the magnitude and
form factor of friction coefficient.


title:
Mean Field Model of Coagulation and Annihilation Reactions in a Medium
  of Quenched Traps: Subdiffusion

abstract:
  We present a mean field model for coagulation ($A+A\to A$) and annihilation
($A+A\to 0$) reactions on lattices of traps with a distribution of depths
reflected in a distribution of mean escape times. The escape time from each
trap is exponentially distributed about the mean for that trap, and the
distribution of mean escape times is a power law. Even in the absence of
reactions, the distribution of particles over sites changes with time as
particles are caught in ever deeper traps, that is, the distribution exhibits
aging. Our main goal is to explore whether the reactions lead to further (time
dependent) changes in this distribution.


title: Dark Energy and Modified Gravity

abstract:
  Explanations of the late-time cosmic acceleration within the framework of
general relativity are plagued by difficulties. General relativistic models are
mostly based on a dark energy field with fine-tuned, unnatural properties.
There is a great variety of models, but all share one feature in common -- an
inability to account for the gravitational properties of the vacuum energy, and
a failure to solve the so-called coincidence problem. Two broad alternatives to
dark energy have emerged as candidate models: these typically address only the
coincidence problem and not the vacuum energy problem. The first is based on
general relativity and attempts to describe the acceleration as an effect of
inhomogeneity in the universe. If this alternative could be shown to work, then
it would provide a dramatic resolution of the coincidence problem; however, a
convincing demonstration of viability has not yet emerged. The second
alternative is based on infra-red modifications to general relativity, leading
to a weakening of gravity on the largest scales and thus to acceleration. Most
examples investigated so far are scalar-tensor or brane-world models, and we
focus on the simplest candidates of each type: $f(R)$ models and DGP models
respectively. Both of these provide a new angle on the problem, but they also
face serious difficulties. However, investigation of these models does lead to
valuable insights into the properties of gravity and structure formation, and
it also leads to new strategies for testing the validity of General Relativity
itself on cosmological scales.


title: Viscous Effects on Elliptic Flow and Shock Waves

abstract:
  Fast thermalization and a strong buildup of elliptic flow of QCD matter as
found at RHIC are understood as the consequence of perturbative QCD (pQCD)
interactions within the 3+1 dimensional parton cascade BAMPS. The main
contributions stem from pQCD bremsstrahlung $2 \leftrightarrow 3 $ processes.
By comparing to Au+Au data of the flow parameter $v_2$ as a function of
participation number the shear viscosity to entropy ratio is dynamically
extracted, which lies in the range of 0.08 and 0.2, depending on the chosen
coupling constant and freeze out condition. Furthermore, first simulations on
the temporal propagation of dissipative shock waves are given. The cascade can
either simulate true ideal shocks as well as initially diluted, truely viscous
shocks, depending on the employed cross sections or mean free path,
respectively.


title:
Southern Cosmology Survey III: QSO's from Combined GALEX and Optical
  Photometry

abstract:
  We present catalogs of QSO candidates selected using photometry from GALEX
combined with SDSS in the Stripe 82 region and Blanco Cosmology Survey (BCS)
near declination -55 degrees. The SDSS region contains ~700 objects with
magnitude i < 20 and ~3600 objects with i < 21.5 in a ~60 square degree sky
region, while the BCS region contains ~280 objects with magnitude i < 20 and
~2000 objects with i < 21.5 for a 11 square degree sky region that is being
observed by three current microwave Sunyaev-Zeldovich surveys. Our QSO catalog
is the first one in the BCS region. Deep GALEX exposures (~2000 seconds in FUV
and NUV, except in three fields) provide high signal-to-noise photometry in the
GALEX bands (FUV, NUV < 24.5 mag). From this data, we select QSO candidates
using only GALEX and optical r-band photometry, using the method given by Atlee
and Gould (2008). In the Stripe 82 field, 60% (30%) of the GALEX selected QSO's
with optical magnitude i<20 (i<21.5) also appear in the Richards et al. (2008)
QSO catalog constructed using 5-band optical SDSS photometry. Comparison with
the same catalog by Richards et al. shows that the completeness of the sample
is approximately 40%(25%). However, for regions of the sky with very low dust
extinction, like the BCS 23hr field and the Stripe 82 between 0 and 10 degrees
in RA, our completeness is close to 95%, demonstrating that deep GALEX
observations are almost as efficient as multi-wavelength observations at
finding QSO's. GALEX observations thus provide a viable alternate route to QSO
catalogs in sky regions where u-band optical photometry is not available. The
full catalog is available at http://www.ice.csic.es/personal/jimenez/PHOTOZ


title:
Quasi-blackbody component and radiative efficiency of the prompt
  emission of gamma-ray bursts

abstract:
  We perform time-resolved spectroscopy on the prompt emission in gamma-ray
bursts (GRBs) and identify a thermal, photospheric component peaking at a
temperature of a few hundreds keV. This peak does not necessarily coincide with
the broad band (keV-GeV) power peak. We show that this thermal component
exhibits a characteristic temporal behavior. We study a sample of 56 long
bursts, all strong enough to allow time-resolved spectroscopy. We analyze the
evolution of both the temperature and flux of the thermal component in 49
individual time-resolved pulses, for which the temporal coverage is sufficient,
and find that the temperature is nearly constant during the first few seconds,
after which it decays as a power law with a sample-averaged index of -0.68. The
thermal flux first rises with an averaged power-law index of 0.63 after which
it decays with an averaged index of -2. The break times are the same to within
errors. We find that the ratio of the observed to the emergent thermal flux
typically exhibits a monotoneous power-law increase during the entire pulse as
well as during complex bursts. Thermal photons carry a significant fraction
($\sim$ 30 % to more than 50%) of the prompt emission energy (in the observed
25-1900 keV energy band), thereby significantly contributing to the high
radiative efficiency. Finally, we show here that the thermal emission can be
used to study the properties of the photosphere, hence the physical parameters
of the GRB fireball.


title: Trigonometric parallaxes of ten ultracool subdwarfs

abstract:
  We measured absolute trigonometric parallaxes and proper motions with respect
to many background galaxies for a sample of ten ultracool subdwarfs.
  The observations were taken in the H-band with the OMEGA2000 camera at the
3.5m-telescope on Calar Alto, Spain during a time period of 3.5 years. For the
first time, the reduction of the astrometric measurements was carried out
directly with respect to background galaxies. We obtained absolute parallaxes
with mean errors ranging between 1 and 3 mas.
  With six completely new parallaxes we more than doubled the number of
benchmark ultracool (>sdM7) subdwarfs. Six stars in the M_{K_s} vs. J-K_s
diagram fit perfectly to model subdwarf sequences from M7 to L4 with [M/H]
between -1.0 and -1.5, whereas 4 are consistent with a moderately low
metallicity ([M/H]=-0.5) from M7 to T6. All but one of our objects have large
tangential velocities between 200 and 320 km/s typical of the Galactic halo
population.
  Our results are in good agreement with recent independent measurements for
three of our targets and confirm the previously measured parallax and absolute
magnitude M_{K_s} of the nearest and coolest (T-type) subdwarf 2MASS 0937+29
with higher accuracy.
  For all targets, we also obtained infrared J,H,K_s photometry at a level of a
few milli-magnitudes relative to 2MASS standards.


title:
Forster energy transfer signatures in optically driven quantum dot
  molecules

abstract:
  The Forster resonant energy transfer mechanism (FRET) is investigated in
optically driven and electrically gated tunnel coupled quantum dot molecules.
Two novel FRET induced optical signatures are found in the dressed excitonic
spectrum. This is constructed from exciton level occupation as function of pump
laser energy and applied bias, resembling a level anticrossing spectroscopy
measurement. We observe a redistribution of spectral weight and splitting of
the exciton spectral lines. FRET among single excitons induces a splitting in
the spatially-direct exciton lines, away from the anticrossing due to charge
tunneling in the molecule. However, near the anticrossing, a novel signature
appears as a weak satellite line following an indirect exciton line. FRET
signatures may also occur among indirect excitons, appearing as split indirect
lines. In that case, the signatures appear also in the direct biexciton states,
as the indirect satellite mixes in near the tunneling anticrossing region.


title: LACK - a VoIP Steganographic Method

abstract:
  The paper presents a new steganographic method called LACK (Lost Audio
PaCKets Steganography) which is intended mainly for VoIP. The method is
presented in a broader context of network steganography and of VoIP
steganography in particular. The analytical results presented in the paper
concern the influence of LACK's hidden data insertion procedure on the method's
impact on quality of voice transmission and its resistance to steganalysis.


title:
Artin automorphisms, Cyclotomic function fields, and Folded
  list-decodable codes

abstract:
  Algebraic codes that achieve list decoding capacity were recently constructed
by a careful ``folding'' of the Reed-Solomon code. The ``low-degree'' nature of
this folding operation was crucial to the list decoding algorithm. We show how
such folding schemes conducive to list decoding arise out of the
Artin-Frobenius automorphism at primes in Galois extensions. Using this
approach, we construct new folded algebraic-geometric codes for list decoding
based on cyclotomic function fields with a cyclic Galois group. Such function
fields are obtained by adjoining torsion points of the Carlitz action of an
irreducible $M \in \F_q[T]$. The Reed-Solomon case corresponds to the simplest
such extension (corresponding to the case $M=T$). In the general case, we need
to descend to the fixed field of a suitable Galois subgroup in order to ensure
the existence of many degree one places that can be used for encoding.
  Our methods shed new light on algebraic codes and their list decoding, and
lead to new codes achieving list decoding capacity. Quantitatively, these codes
provide list decoding (and list recovery/soft decoding) guarantees similar to
folded Reed-Solomon codes but with an alphabet size that is only
polylogarithmic in the block length. In comparison, for folded RS codes, the
alphabet size is a large polynomial in the block length. This has applications
to fully explicit (with no brute-force search) binary concatenated codes for
list decoding up to the Zyablov radius.


title:
Comparison of electric dipole moments and the Large Hadron Collider for
  probing CP violation in triple boson vertices

abstract:
  CP violation from physics beyond the Standard Model may reside in triple
boson vertices of the electroweak theory. We review the effective theory
description and discuss how CP violating contributions to these vertices might
be discerned by electric dipole moments (EDM) or diboson production at the
Large Hadron Collider (LHC). Despite triple boson CP violating interactions
entering EDMs only at the two-loop level, we find that EDM experiments are
generally more powerful than the diboson processes. To give example to these
general considerations we perform the comparison between EDMs and collider
observables within supersymmetric theories that have heavy sfermions, such that
substantive EDMs at the one-loop level are disallowed. EDMs generally remain
more powerful probes, and next-generation EDM experiments may surpass even the
most optimistic assumptions for LHC sensitivities.


title:
Volume dependence of two-dimensional large-N QCD with a nonzero density
  of baryons

abstract:
  We take a first step towards the solution of QCD in 1+1 dimensions at nonzero
density. We regularize the theory in the UV by using a lattice and in the IR by
putting the theory in a box of spatial size L. After fixing to axial gauge we
use the coherent states approach to obtain the large-N classical Hamiltonian H
that describes color neutral quark-antiquark pairs interacting with spatial
Polyakov loops in the background of baryons. Minimizing H we get a regularized
form of the `t Hooft equation that depends on the expectation values of the
Polyakov loops. Analyzing the L-dependence of this equation we show how volume
independence, a la Eguchi and Kawai, emerges in the large-N limit, and how it
depends on the expectation values of the Polyakov loops. We describe how this
independence relies on the realization of translation symmetry, in particular
when the ground state contains a baryon crystal. Finally, we remark on the
implications of our results on studying baryon density in large-N QCD within
single-site lattice theories, and on some general lessons concerning the way
four-dimensional large-N QCD behaves in the presence of baryons.


title: On Bell's theorem, quantum communication, and entanglement detection

abstract:
  (A) Bell's theorem rests on a conjunction of three assumptions: realism,
locality and ``free will''. A discussion of these assumptions will be
presented.
  It will be also shown that, if one adds to the assumptions the principle or
rotational symmetry of physical laws, a stronger version of the theorem
emerges. (B) A link between Bell's theorem and communication complexity
problems will be presented. This also includes experimental realizations, which
surprisingly do not involve entanglement. (C) A new sufficient and necessary
criterion for entanglement of general (mixed) states is be presented. It is
derived using the same geometric starting point as the inclusion of the
symmetry in (A). The set of entanglement identifiers (EI's) emerging via this
method contains entanglement witnesses (EW's), but they form only a subset of
all EI's. Thus the method is more powerful than the one based on EW's.


title: The noise spectra of a biased quantum dot

abstract:
  The noise spectra associated with correlations of the current through a
single level quantum dot, and with the charge fluctuations on the dot, are
calculated for a finite bias voltage. The results turn out to be sensitive to
the asymmetry of the dot's coupling to the two leads. At zero temperature, both
spectra exhibit two or four steps (as a function of the frequency), depending
on whether the resonant level lies outside or within the range between the
chemical potentials on the two leads. In addition, the low frequency shot-noise
exhibits dips in the charge noise and dips, peaks, and discontinuities in the
derivative of the current noise. In spite of some smearing, several of these
features persist at finite temperatures, where a dip can also turn into a peak.


title: The structure of Valdivia compact lines

abstract:
  We study linearly ordered spaces which are Valdivia compact in their order
topology. We find an internal characterization of these spaces and we present a
counter-example disproving a conjecture posed earlier by the first author. The
conjecture asserted that a compact line is Valdivia compact if its weight does
not exceed aleph one, every point of uncountable character is isolated from one
side and every closed first countable subspace is metrizable. It turns out that
the last condition is not sufficient. On the other hand, we show that the
conjecture is valid if the closure of the set of points of uncountable
character is scattered. This improves an earlier result of the first author.


title: Nernst effect in the two-dimensional XY model

abstract:
  We calculate the Nernst signal directly in the phenomenological
two-dimensional XY model. The obtained numerical results are consistent with
the experimental observations in some high-Tc cuprate superconductors
qualitatively, where the vortex Nernst signal has a characteristic tilt-hill
profile. It is suggested that the excitations of vortex and anti-vortex in 2D
is the possible origin of the anomalous Nernst effect.


title: Heavy flavour phenomenology from lattice QCD

abstract:
  The focus of this report is the lattice calculation of hadronic parameters
relevant to heavy flavour phenomenology. I will review recent results and the
current status of studies of the B and D decay constants, semileptonic decay
form factors, B^0-\bar B^0 mixing, and determinations of the quark masses m_c
and m_b. Some studies of heavy flavour observables have used current lattice
results to derive Standard Model predictions that seem to disagree with
experimental measurements. That is the case, for example, of sin(2\beta) and
f_{D_s}. This report discusses efforts to resolvethe origin of those
discrepancies from the lattice side.


title:
Coupling internal atomic states in a two-component Bose-Einstein
  condensate via an optical lattice: Extended Mott-superfluid transitions

abstract:
  An ultracold gas of coupled two-component atoms in an optical field is
studied. Due to the internal two-level structure of the atoms, three competing
energy terms exist; atomic kinetic, atomic internal, and atom-atom interaction
energies. A novel outcome of this interplay, not present in the regular
Bose-Hubbard model, is that in the single band and tight binding approximations
four different phases appear: two superfluid and two Mott phases. When passing
through the critical point between the two superfluid or the two Mott phases, a
swapping of the internal atomic populations takes place. By means of the strong
coupling expansion, we find the full phase diagram for the four different
phases.


title: Monoidal transformations of singularities in positive characteristic

abstract:
  A sequence of monoidal transformations is defined, in terms of invariants,
for a singular hypersurface embedded in a smooth scheme of positive
characteristic. Some examples are added to illustrate the improvement of
singularities by this procedure.


title: A stochastic spectral analysis of transcriptional regulatory cascades

abstract:
  The past decade has seen great advances in our understanding of the role of
noise in gene regulation and the physical limits to signaling in biological
networks. Here we introduce the spectral method for computation of the joint
probability distribution over all species in a biological network. The spectral
method exploits the natural eigenfunctions of the master equation of
birth-death processes to solve for the joint distribution of modules within the
network, which then inform each other and facilitate calculation of the entire
joint distribution. We illustrate the method on a ubiquitous case in nature:
linear regulatory cascades. The efficiency of the method makes possible
numerical optimization of the input and regulatory parameters, revealing design
properties of, e.g., the most informative cascades. We find, for threshold
regulation, that a cascade of strong regulations converts a unimodal input to a
bimodal output, that multimodal inputs are no more informative than bimodal
inputs, and that a chain of up-regulations outperforms a chain of
down-regulations. We anticipate that this numerical approach may be useful for
modeling noise in a variety of small network topologies in biology.


title: A Higher-Derivative Lee-Wick Standard Model

abstract:
  The Lee-Wick Standard Model assumes a minimal set of higher-derivative
quadratic terms that produce a negative-norm partner for each Standard Model
particle. Here we introduce additional terms of one higher order in the
derivative expansion that give each Standard Model particle two Lee-Wick
partners: one with negative and one with positive norm. These states
collectively cancel unwanted quadratic divergences and resolve the hierarchy
problem as in the minimal theory. We show how this next-to-minimal
higher-derivative theory may be reformulated via an auxiliary field approach
and written as a Lagrangian with interactions of dimension four or less. This
mapping provides a convenient framework for studies of the formal and
phenomenological properties of the theory.


title:
Kangaroo points and oblique polynomials in resolution of positive
  characteristic

abstract:
  Updated version. Includes comments on the advances in the field from the
Kyoto workshop on Resolution of Singularities in Positive Characteristic,
December 2008.
  The article surveys the theory of kangaroo points as they appear in the
resolution of singularities in positive characteristic. They represent one of
the main obstructions for transcribing the characteristic zero proof of
resolution to positive characteristic. Kangaroo points are classified through
the concept of oblique polynomials. The results of the article are used in
Hironaka's recent program towards the resolution of singularities in positive
characteristic.


title:
Combinatorial Formulas for Macdonald and Hall-Littlewood Polynomials of
  Types A and C. Extended Abstract

abstract:
  A breakthrough in the theory of (type A) Macdonald polynomials is due to
Haglund, Haiman and Loehr, who exhibited a combinatorial formula for these
polynomials in terms of fillings of Young diagrams. Recently, Ram and Yip gave
a formula for the Macdonald polynomials of arbitrary type in terms of the
corresponding affine Weyl group. In this paper, we show that a
Haglund-Haiman-Loehr type formula follows naturally from the more general
Ram-Yip formula, via compression. Then we extend this approach to the
Hall-Littlewood polynomials of type C, which are specializations of the
corresponding Macdonald polynomials at q=0. We note that no analog of the
Haglund-Haiman-Loehr formula exists beyond type A, so our work is a first step
towards finding such a formula.


title: Decaying Dark Matter can explain the electron/positron excesses

abstract:
  PAMELA and ATIC recently reported excesses in e+ e- cosmic rays. Since the
interpretation in terms of DM annihilations was found to be not easily
compatible with constraints from photon observations, we consider the DM decay
hypothesis and find that it can explain the e+ e- excesses compatibly with all
constraints, and can be tested by dedicated HESS observations of the Galactic
Ridge. ATIC data indicate a DM mass of about 2 TeV: this mass naturally implies
the observed DM abundance relative to ordinary matter if DM is a quasi-stable
composite particle with a baryon-like matter asymmetry. Technicolor naturally
yields these type of candidates.


title:
On the origin of white dwarfs with carbon-dominated atmospheres: the
  case of H1504+65

abstract:
  We explore different evolutionary scenarios to explain the helium deficiency
observed in H1504+65, the most massive known PG1159 star. We concentrate mainly
on the possibility that this star could be the result of mass loss shortly
after the born-again and during the subsequent evolution through the [WCL]
stage. This possibility is sustained by recent observational evidence of
extensive mass-loss events in Sakurai's object and is in line with the recent
finding that such mass losses give rise to PG1159 models with thin helium-rich
envelopes and large rates of period change, as demanded by the pulsating star
PG1159-035. We compute the post born again evolution of massive sequences by
taking into account different mass-loss rate histories. Our results show that
stationary winds during the post-born-again evolution fail to remove completely
the helium-rich envelope so as to explain the helium deficiency observed in
H1504+65. Stationary winds during the Sakurai and [WCL] stages only remove at
most half of the envelope surviving the violent hydrogen burning during the
born-again phase. In view of our results, the recently suggested evolutionary
connection born-again stars --> H1504+65 --> white dwarfs with carbon-rich
atmospheres is difficult to sustain unless the whole helium-rich envelope could
be ejected by non-stationary mass-loss episodes during the Sakurai stage.


title:
Cosmological measurements, time and observables in (2+1)-dimensional
  gravity

abstract:
  We investigate the relation between measurements and the physical observables
for vacuum spacetimes with compact spatial surfaces in (2+1)-gravity with
vanishing cosmological constant. By considering an observer who emits lightrays
that return to him at a later time, we obtain explicit expressions for several
measurable quantities as functions on the physical phase space of the theory:
the eigentime elapsed between the emission of a lightray and its return to the
observer, the angles between the directions into which the light has to be
emitted to return to the observer and the relative frequencies of the lightrays
at their emission and return. This provides a framework in which conceptual
questions about time, observables and measurements can be addressed. We analyse
the properties of these measurements and their geometrical interpretation and
show how they allow an observer to determine the values of the Wilson loop
observables that parametrise the physical phase space of (2+1)-gravity. We
discuss the role of time in the theory and demonstrate that the specification
of an observer with respect to the spacetime's geometry amounts to a gauge
fixing procedure yielding Dirac observables.


title: Some weak indivisibility results in ultrahomogeneous metric spaces

abstract:
  We study the validity of a partition property known as weak indivisibility
for the integer and the rational Urysohn metric spaces. We also compare weak
indivisiblity to another partition property, called age-indivisibility, and
provide an example of a countable ultrahomogeneous metric space which may be
age-indivisible but not weakly indivisible.


title: Diffraction from the beta-sheet crystallites in spider silk

abstract:
  We analyze the wide angle x-ray scattering from oriented spider silk fibers
in terms of a quantitative scattering model, including both structural and
statistical parameters of the $\beta$-sheet crystallites of spider silk in the
amorphous matrix. The model is based on kinematic scattering theory and allows
for rather general correlations of the positional and orientational degrees of
freedom, including the crystallite's size, composition and dimension of the
unit cell. The model is evaluated numerically and compared to experimental
scattering intensities allowing us to extract the geometric and statistical
parameters. We show explicitly that for the experimentally found mosaicity
(width of the orientational distribution) inter-crystallite effects are
negligible and the data can be analyzed in terms of single crystallite
scattering, as is usually assumed in the literature.


title: Photometric redshift accuracy in AKARI Deep Surveys

abstract:
  We investigate the photometric redshift accuracy achievable with the AKARI
infrared data in deep multi-band surveys, such as in the North Ecliptic Pole
field. We demonstrate that the passage of redshifted policyclic aromatic
hydrocarbons and silicate features into the mid-infrared wavelength window
covered by AKARI is a valuable means to recover the redshifts of starburst
galaxies. To this end we have collected a sample of ~60 galaxies drawn from the
GOODS-North Field with spectroscopic redshift 0.5<~z_spec<~1.5 and photometry
from 3.6 to 24 micron, provided by the Spitzer, ISO and AKARI satellites. The
infrared spectra are fitted using synthetic galaxy Spectral Energy
Distributions which account for starburst and active nuclei emission. For ~90%
of the sources in our sample the redshift is recovered with an accuracy
|z_phot-z_spec|/(1+z_spec)<~10%. A similar analysis performed on different sets
of simulated spectra shows that the AKARI infrared data alone can provide
photometric redshifts accurate to |z_phot-z_spec|/(1+z_spec)<~10% (1-sigma) at
z<~2. At higher redshifts the PAH features are shifted outside the wavelength
range covered by AKARI and the photo-z estimates rely on the less prominent 1.6
micron stellar bump; the accuracy achievable in this case on (1+z) is ~10-15%,
provided that the AGN contribution to the infrared emission is subdominant. Our
technique is no more prone to redshift aliasing than optical-uv photo-z, and it
may be possible to reduce this aliasing further with the addition of
submillimetre and/or radio data.


title: An Elementary Classification of Symmetric 2-Cocycles

abstract:
  We present a classification of the so-called "additive symmetric 2-cocycles"
of arbitrary degree and dimension over Z/p, along with a partial result and
some conjectures for m-cocycles over Z/p, m > 2. This expands greatly on a
result originally due to Lazard and more recently investigated by Ando,
Hopkins, and Strickland, which together with their work culminates in a
complete classification of 2-cocycles over an arbitrary commutative ring. The
ring classifying these polynomials finds application in algebraic topology,
including generalizations of formal group laws and of cubical structures.


title:
Hamiltonian General Relativity and the Belinskii, Khalatnikov, Lifshitz
  Conjecture

abstract:
  The Belinkskii, Khalatnikov and Lifshitz conjecture says that as one
approaches space-like singularities in general relativity, 'time derivatives
dominate over spatial derivatives' so that the dynamics at any spatial point is
well captured by an ordinary differential equation. By now considerable
evidence has accumulated in favor of these ideas. Starting with a Hamiltonian
framework, we provide a formulation of this conjecture in terms of variables
that are tailored to non-perturbative quantization. Our formulation serves as a
first step in the analysis of the fate of generic space-like singularities in
loop quantum gravity.


title: Higgs mass determined by cosmological parameters

abstract:
  Postulating that all massless elementary fields have conformal scaling
symmetry removes a conflict between gravitational theory and the standard model
of elementary quantum fields. If the scalar field essential to SU(2) symmetry
breaking has conformal symmetry, it must depend explicitly on the Ricci
curvature scalar of gravitational theory. This has profound consequences for
both cosmology and elementary particle physics, since cosmological data
determine scalar field parameters. A modified Friedmann equation is derived and
solved numerically. The theory is consistent with all relevant data for
supernovae redshifts below $z=1$. The implied value of the cosmological
constant implies extremely small Higgs mass, far below current empirical lower
bounds. Detection of a Higgs boson with large mass would falsify this argument.


title:
Optimal Encoding Schemes for Several Classes of Discrete Degraded
  Broadcast Channels

abstract:
  Consider a memoryless degraded broadcast channel (DBC) in which the channel
output is a single-letter function of the channel input and the channel noise.
As examples, for the Gaussian broadcast channel (BC) this single-letter
function is regular Euclidian addition and for the binary-symmetric BC this
single-letter function is Galois-Field-two addition. This paper identifies
several classes of discrete memoryless DBCs for which a relatively simple
encoding scheme, which we call natural encoding, achieves capacity. Natural
Encoding (NE) combines symbols from independent codebooks (one for each
receiver) using the same single-letter function that adds distortion to the
channel. The alphabet size of each NE codebook is bounded by that of the
channel input.
  Inspired by Witsenhausen and Wyner, this paper defines the conditional
entropy bound function $F^*$, studies its properties, and applies them to show
that NE achieves the boundary of the capacity region for the multi-receiver
broadcast Z channel. Then, this paper defines the input-symmetric DBC,
introduces permutation encoding for the input-symmetric DBC, and proves its
optimality. Because it is a special case of permutation encoding, NE is
capacity achieving for the two-receiver group-operation DBC. Combining the
broadcast Z channel and group-operation DBC results yields a proof that NE is
also optimal for the discrete multiplication DBC. Along the way, the paper also
provides explicit parametric expressions for the two-receiver binary-symmetric
DBC and broadcast Z channel.


title:
Packing and Covering Properties of Subspace Codes for Error Control in
  Random Linear Network Coding

abstract:
  Codes in the projective space and codes in the Grassmannian over a finite
field - referred to as subspace codes and constant-dimension codes (CDCs),
respectively - have been proposed for error control in random linear network
coding. For subspace codes and CDCs, a subspace metric was introduced to
correct both errors and erasures, and an injection metric was proposed to
correct adversarial errors. In this paper, we investigate the packing and
covering properties of subspace codes with both metrics. We first determine
some fundamental geometric properties of the projective space with both
metrics. Using these properties, we then derive bounds on the cardinalities of
packing and covering subspace codes, and determine the asymptotic rates of
optimal packing and optimal covering subspace codes with both metrics. Our
results not only provide guiding principles for the code design for error
control in random linear network coding, but also illustrate the difference
between the two metrics from a geometric perspective. In particular, our
results show that optimal packing CDCs are optimal packing subspace codes up to
a scalar for both metrics if and only if their dimension is half of their
length (up to rounding). In this case, CDCs suffer from only limited rate loss
as opposed to subspace codes with the same minimum distance. We also show that
optimal covering CDCs can be used to construct asymptotically optimal covering
subspace codes with the injection metric only.


title: Color-flavor locked strange matter and strangelets at finite temperature

abstract:
  It is possible that a system composed of up, down and strange quarks consists
the true ground state of nuclear matter at high densities and low temperatures.
This exotic plasma, called strange quark matter (SQM), seems to be even more
favorable energetically if quarks are in a superconducting state, the so-called
color-flavor locked state. Here are presented calculations made on the basis of
the MIT bag model considering the influence of finite temperature on the
allowed parameters characterizing the system for stability of bulk SQM (the
so-called stability windows) and also for strangelets, small lumps of SQM, both
in the color-flavor locking scenario. We compare these results with the
unpaired SQM and also briefly discuss some astrophysical implications of them.
Also, the issue of strangelet's electric charge is discussed. The effects of
dynamical screening, though important for non-paired SQM strangelets, are not
relevant when considering pairing among all three flavor and colors of quarks.


title: Prospects for Upgrade of KEKB

abstract:
  The Belle experiment at the KEKB electron-positron collider is expected to
have collected close to one billion $\Upsilon$(4S) events by the time it comes
to an end in 2009. An upgrade to KEKB has been proposed. It is designed for an
order of magnitude higher luminosity than KEKB, following a three-year
construction period. The ultimate goal of $8 \times 10^{35}{\rm cm}^{-2}{\rm
s}^{-1}$ luminosity would be reached through further improvements over several
years. To exploit the physics accessible through this improved luminosity, an
upgrade of the Belle detector is also planned. A new international
collaboration, temporarily named sBelle, is in the process of being formed.
Super-KEKB and sBelle were officially placed on the KEK 5-year Roadmap in early
2008.


title:
States and amplitudes for finite regions in a two-dimensional Euclidean
  quantum field theory

abstract:
  We quantize the Helmholtz equation (plus perturbative interactions) in two
dimensions to illustrate a manifestly local description of quantum field
theory. Using the general boundary formulation we describe the quantum dynamics
both in a traditional time evolution setting as well as in a setting referring
to finite disk (or annulus) shaped regions of spacetime. We demonstrate that
both descriptions are equivalent when they should be.


title: Penalized Orthogonal-Components Regression for Large p Small n Data

abstract:
  We propose a penalized orthogonal-components regression (POCRE) for large p
small n data. Orthogonal components are sequentially constructed to maximize,
upon standardization, their correlation to the response residuals. A new
penalization framework, implemented via empirical Bayes thresholding, is
presented to effectively identify sparse predictors of each component. POCRE is
computationally efficient owing to its sequential construction of leading
sparse principal components. In addition, such construction offers other
properties such as grouping highly correlated predictors and allowing for
collinear or nearly collinear predictors. With multivariate responses, POCRE
can construct common components and thus build up latent-variable models for
large p small n data.


title: Vector unparticle contributions to lepton g-2

abstract:
  The generic unparticle propagator may be modified in two ways. Breaking the
conformal symmetry effectively adds a mass term to the propagator, while
considering vacuum polarization corrections adds a width-like term. Both of
these modifications result naturally from the coupling of the unparticle to
standard model (SM) fields. We explore how these modifications to the
propagator affect the calculation of the lepton anomalous magnetic moment using
an integral approximation of the propagator that is accurate for
$d\lesssim1.5$, where $d$ is the unparticle dimension. We find that for this
range of $d$ and various values of the conformal breaking scale $\mu$, the
value of $g-2$ calculated when allowing various SM fermions to run in the
unparticle self-energy loops does not significantly deviate from the value of
$g-2$ when the width term is ignored. We also investigate the limits on a
characteristic mass scale for the unparticle sector as a function of $\mu$ and
$d$.


title:
HiggsBounds: Confronting Arbitrary Higgs Sectors with Exclusion Bounds
  from LEP and the Tevatron

abstract:
  HiggsBounds is a computer code that tests theoretical predictions of models
with arbitrary Higgs sectors against the exclusion bounds obtained from the
Higgs searches at LEP and the Tevatron. The included experimental information
comprises exclusion bounds at 95% C.L. on topological cross sections. In order
to determine which search topology has the highest exclusion power, the program
also includes, for each topology, information from the experiments on the
expected exclusion bound, which would have been observed in case of a pure
background distribution. Using the predictions of the desired model provided by
the user as input, HiggsBounds determines the most sensitive channel and tests
whether the considered parameter point is excluded at the 95% C.L. HiggsBounds
is available as a Fortran 77 and Fortran 90 code. The code can be invoked as a
command line version, a subroutine version and an online version. Examples of
exclusion bounds obtained with HiggsBounds are discussed for the Standard
Model, for a model with a fourth generation of quarks and leptons and for the
Minimal Supersymmetric Standard Model with and without CP-violation. The
experimental information on the exclusion bounds currently implemented in
HiggsBounds will be updated as new results from the Higgs searches become
available.


title:
High resolution dynamical mapping of social interactions with active
  RFID

abstract:
  In this paper we present an experimental framework to gather data on
face-to-face social interactions between individuals, with a high spatial and
temporal resolution. We use active Radio Frequency Identification (RFID)
devices that assess contacts with one another by exchanging low-power radio
packets. When individuals wear the beacons as a badge, a persistent radio
contact between the RFID devices can be used as a proxy for a social
interaction between individuals. We present the results of a pilot study
recently performed during a conference, and a subsequent preliminary data
analysis, that provides an assessment of our method and highlights its
versatility and applicability in many areas concerned with human dynamics.


title: Search for Solar Axions with the CDMS-II Experiment

abstract:
  The CDMS-II experiment operates 19 germanium detectors with a mass of 250g
each in a very low background environment. Originally designed for the search
for Dark Matter the experiment can also detect solar axions by Primakoff
conversion to photons. The Bragg condition for X-ray momentum transfer in a
crystal allows for coherent amplification of the Primakoff process. Since the
orientation of the crystal lattice with respect to the Sun changes with daytime
an unique pattern in time and energy of solar axion conversions is expected.
The low background ~1.5 counts/kg/day/keV and knowledge of the exact
orientation of all three crystal axes with respect to the Sun make the CDMS-II
experiment very sensitive to solar axions. In contrast to helioscopes, the high
mass region < 1 keV can also be probed effectively. The alternating
orientations of the individual crystals in the experimental setup provide
different patterns of solar axion conversion, making a false positive result
extremely unlikely. The result of an analysis of 289 kg-days of exposure
resulted in a null observation of solar axion conversion. This analysis sets an
upper limit on the axion photon coupling constant of g_{a\gamma\gamma} < 2.6 x
10^{-9} GeV{-1} at a 95% confidence level.


title:
Signatures of the Milky Way's Dark Disk in Current and Future
  Experiments

abstract:
  In hierarchical structure formation models of disk galaxies, a dark matter
disk forms as massive satellites are preferentially dragged into the disk-plane
where they dissolve. Here, we quantify the importance of this dark disk for
direct and indirect dark matter detection. The low velocity of the dark disk
with respect to the Earth enhances detection rates in direct detection
experiments at low recoil energy. For WIMP masses M_{WIMP} >~ 50 GeV, the
detection rate increases by up to a factor of 3 in the 5 - 20 keV recoil energy
range. Comparing this with rates at higher energy is sensitive to M_{WIMP},
providing stronger mass constraints particularly for M_{WIMP}>~100 GeV. The
annual modulation signal is significantly boosted by the dark disk and the
modulation phase is shifted by ~3 weeks relative to the dark halo. The
variation of the observed phase with recoil energy determines M_{WIMP}, once
the dark disk properties are fixed by future astronomical surveys. The low
velocity of the particles in the dark disk with respect to the solar system
significantly enhances the capture rate of WIMPs in the Sun, leading to an
increased flux of neutrinos from the Sun which could be detected in current and
future neutrino telescopes. The dark disk contribution to the muon flux from
neutrino back conversion at the Earth is increased by a factor of ~5 compared
to the SHM, for rho_d/rho_h=0.5.


title:
Parameter degeneracies and (un)predictability of gravitational
  microlensing events

abstract:
  (abridged) Some difficulties in determining the physical properties that lead
to observed anomalies in microlensing light curves, such as the mass and
separation of extra-solar planets orbiting the lens star, or the relative
source-lens parallax, are already anchored in factors that limit the amount of
information available from ordinary events and in the adopted parametrization.
Moreover, a real-time detection of deviations from an ordinary light curve
while these are still in progress can only be done against a known model of the
latter, and such is also required for properly prioritizing ongoing events for
monitoring in order to maximize scientific returns. Despite the fact that
ordinary microlensing light curves are described by an analytic function that
only involves a handful of parameters, modelling these is far less trivial than
one might be tempted to think. A well-known degeneracy for small impacts, and
another one for the initial rise of an event, makes an interprediction of
different phases impossible, while determining a complete set of model
parameters requires the assessment of the fundamental characteristics of all
these phases. While the wing of the light curve provides valuable information
about the time-scale that absorbs the physical properties, the peak flux of the
event can be meaningfully predicted only after about a third of the total
magnification has been reached. Parametrizations based on observable features
not only ease modelling by bringing the covariance matrix close to diagonal
form, but also allow good predictions of the measured flux without the need to
determine all parameters accurately. Campaigns intending to infer planet
populations from observed microlensing events need to invest some time into
acquiring data that allows to properly determine the magnification function.


title: The role of monopoles in a Gluon Plasma

abstract:
  We study the role of magnetic monopoles at high enough temperature $T>2T_c$,
when they can be considered heavy, rare objects embedded into matter consisting
mostly of the usual "electric" quasiparticles, quarks and gluons. We review
available lattice results on monopoles at finite temperatures. Then we proceed
to classical and quantum charge-monopole scattering, solving the problem of
gluon-monopole scattering for the first time. We find that, while this process
hardly influences thermodynamic quantities, it does produce a large transport
cross section, significantly exceeding that for pQCD gluon-gluon scattering up
to quite high $T$. Thus, in spite of their relatively small density at high
$T$, monopoles are extremely important for QGP transport properties, keeping
viscosity small enough for hydrodynamics to work at LHC.


title: Polyharmonic approximation on the sphere

abstract:
  The purpose of this article is to provide new error estimates for a popular
type of SBF approximation on the sphere: approximating by linear combinations
of Green's functions of polyharmonic differential operators. We show that the
$L_p$ approximation order for this kind of approximation is $\sigma$ for
functions having $L_p$ smoothness $\sigma$ (for $\sigma$ up to the order of the
underlying differential operator, just as in univariate spline theory). This is
an improvement over previous error estimates, which penalized the approximation
order when measuring error in $L_p$, p>2 and held only in a restrictive setting
when measuring error in $L_p$, p<2.


title:
Halo mass function and scale-dependent bias from N-body simulations with
  non-Gaussian initial conditions

abstract:
  We perform a series of high-resolution N-body simulations of cosmological
structure formation starting from Gaussian and non-Gaussian initial conditions.
We adopt the best-fitting cosmological parameters of WMAP (3rd- and 5th-year)
and we consider non-Gaussianity of the local type parameterised by 8 different
values of the non-linearity parameter F_NL. Building upon previous work based
on the Gaussian case, we show that, expressed in terms of suitable variables,
the mass function of friends-of-friends haloes is approximately universal (i.e.
independent of redshift, cosmology, and matter transfer function) to good
precision (nearly 10 per cent) also in non-Gaussian scenarios. We provide
fitting formulae for the high-mass end (M>10^13 M_sol/h) of the universal mass
function in terms of F_NL, and we also present a non-universal fit in terms of
both F_NL and z to be used for applications requiring higher accuracy. In the
Gaussian case, we extend our fit to a wider range of halo masses (M>2.4 x 10^10
M_sol/h) and we also provide a consistent fit of the linear halo bias. We show
that, for realistic values of F_NL, the matter power-spectrum in non-Gaussian
cosmologies departs from the Gaussian one by up to 2 per cent on the scales
where the baryonic- oscillation features are imprinted on the 2-point
statistics. We confirm the strong k-dependence of the halo bias on large scales
(k<0.05 h Mpc^-1) which was already detected in previous studies. However, we
find that commonly used parameterisations based on the peak-background split do
not provide an accurate description of our simulations which present extra
dependencies on the wavenumber, the non-linearity parameter and, possibly, the
clustering strength. We provide an accurate fit of the simulation data that can
be used as a benchmark for future determinations of F_NL with galaxy surveys.


title: Holographic Duals of Kaluza-Klein Black Holes

abstract:
  We apply Brown-Henneaux's method to the 5D extremal rotating Kaluza-Klein
black holes essentially following the calculation of the Kerr/CFT
correspondence, which is not based on supersymmetry nor string theory. We find
that there are two completely different Virasoro algebras that can be obtained
as the asymptotic symmetry algebras according to appropriate boundary
conditions. The microscopic entropies are calculated by using the Cardy formula
for both boundary conditions and they perfectly agree with the
Bekenstein-Hawking entropy. The rotating Kaluza-Klein black holes contain a 4D
dyonic Reissner-Nordstrom black hole and Myers-Perry black hole. Since the
D-brane configurations corresponding to these black holes are known, we expect
that our analysis will shed some light on deeper understanding of chiral CFT2's
dual to extremal black holes.


title: Supersymmetric Cosmology and Dark Energy

abstract:
  Using the superfield approach we construct the n = 2 supersymmetric
lagrangian for the FRW Universe with perfect fluid as matter fields. The
obtained supersymmetric algebra allowed us to take the square root of the
Wheeler-DeWitt equation and solve the corresponding quantum constraint. This
model leads to the relation between the vacuum energy density and the energy
density of the dust matter.


title:
Excited state calculations using phaseless auxiliary-field quantum Monte
  Carlo: potential energy curves of low lying C2 singlet states

abstract:
  We show that the recently developed phaseless auxiliary-field quantum Monte
Carlo (AFQMC) method can be used to study excited states, providing an
alternative to standard quantum chemistry methods. The phaseless AFQMC
approach, whose computational cost scales as M^3-M^4 with system size M, has
been shown to be among the most accurate many-body methods in ground state
calculations. For excited states, prevention of collapse into the ground state
and control of the Fermion sign/phase problem are accomplished by the
approximate phaseless constraint with a trial wave function. Using the
challenging C2 molecule as a test case, we calculate the potential energy
curves of the ground and two low-lying singlet excited states. The trial wave
function is obtained by truncating complete active space wave functions, with
no further optimization. The phaseless AFQMC results using a small basis set
are in good agreement with exact full configuration interaction calculations,
while those using large basis sets are in good agreement with experimental
spectroscopic constants.


title: On a spherical code in the space of spherical harmonics

abstract:
  In this short note we propose a new method for construction new nice
arrangement on the sphere $S^d$ using the spaces of spherical harmonic.


title: Structural and physical properties of $SrMn_{1-x}Ru_xO_3$ perovskites

abstract:
  We combine the results of magnetic and transport measurements with neutron
diffraction data to construct the structural and magnetic phase diagram of the
entire family of SrMn$_{1-x}$Ru$_{x}$O$_3$ ($0 \leqslant x \leqslant 1$)
perovskites. We have found antiferromagnetic ordering of the C type for lightly
Ru-substituted materials ($0.06 \leqslant x \leqslant 0.5$) in a similar manner
to $R_{y}$Sr$_{1-y}$MnO$_3$ ($R$=La, Pr), due to the generation of Mn$^{3+}$ in
both families of manganite perovskites by either $B$-site substitution of
Ru$^{5+}$ for Mn$^{4+}$ or $A$-site substitution of $R^{3+}$ for Sr$^{2+}$.
This similarity is driven by the same ratio of $d^4$ / $d^3$ ions in both
classes of materials for equivalent substitution level. In both cases, a
tetragonal lattice distortion is observed, which for some compositions ($0.06
\leqslant x \leqslant 0.2$) is coupled to a C-type AF transition and results in
a first order magnetic and resistive transition. Heavily substituted
SrMn$_{1-x}$Ru$_{x}$O$_3$ materials are ferromagnetic due to dominating
exchange interactions between the Ru$^{4+}$ ions. Intermediate substitution
($0.6 \leqslant x \leqslant 0.7$) leads to a spin-glass behavior instead of a
quantum critical point reported previously in single crystals, due to enhanced
disorder.


title: On the discrete logarithm problem

abstract:
  Let $p>2$ be prime and $g$ a primitive root modulo $p$. We present an
argument for the fact that discrete logarithms of the numbers in any arithmetic
progression are uniformly distributed in $[1,p]$ and raise some questions on
the subject.


title:
Non-trivial effect of the in-plane shear elasticity on the phase
  transitions of fixed-connectivity meshwork models

abstract:
  We numerically study the phase structure of two types of triangulated
spherical surface models, which includes an in-plane shear energy in the
Hamiltonian, and we found that the phase structure of the models is
considerably influenced by the presence of the in-plane shear elasticity. The
models undergo a first-order collapsing transition and a first-order (or
second-order) transition of surface fluctuations; the latter transition was
reported to be of second-order in the first model without the in-plane shear
energy. This leads us to conclude that the in-plane elasticity strengthens the
transition of surface fluctuations. We also found that the in-plane elasticity
decreases the variety of phases in the second model without the in-plane
energy. The Hamiltonian of the first model is given by a linear combination of
the Gaussian bond potential, a one-dimensional bending energy, and the in-plane
shear energy. The second model is obtained from the first model by replacing
the Gaussian bond potential with the Nambu-Goto potential, which is defined by
the summation over the area of triangles.


title: Conformal compactification of asymptotically locally hyperbolic metrics

abstract:
  In this paper we study the extent to which conformally compact asymptotically
hyperbolic metrics may be characterized intrinsically. Building on the work of
the first author, we prove that decay of sectional curvature to -1 and decay of
covariant derivatives of curvature outside an appropriate compact set yield
H\"older regularity for a conformal compactification of the metric. In the
Einstein case, we prove that the estimate on the sectional curvature implies
the control of all covariant derivatives of the Weyl tensor, permitting us to
strengthen our result.


title: Investigation of dephasing rates in an interacting Rydberg gas

abstract:
  We experimentally and theoretically investigate the dephasing rates of the
coherent evolution of a resonantly driven pseudo spin emersed in a reservoir of
pseudo spins. The pseudo spin is realized by optically exciting 87 Rb atoms to
a Rydberg state. Hence, the upper spin states are coupled via the strong van
der Waals interaction. Two different experimental techniques to measure the
dephasing rates are shown: the 'rotary echo' technique known from nuclear
magnetic resonance physics and electromagnetically induced transparency. The
experiments are performed in a dense frozen Rydberg gas, either confined in a
magnetic trap or in an optical dipole trap. Additionally, a numerical
simulation is used to analyse the dephasing in the rotary echo experiments.


title:
Search Result Clustering via Randomized Partitioning of Query-Induced
  Subgraphs

abstract:
  In this paper, we present an approach to search result clustering, using
partitioning of underlying link graph. We define the notion of "query-induced
subgraph" and formulate the problem of search result clustering as a problem of
efficient partitioning of given subgraph into topic-related clusters. Also, we
propose a novel algorithm for approximative partitioning of such graph, which
results in cluster quality comparable to the one obtained by deterministic
algorithms, while operating in more efficient computation time, suitable for
practical implementations. Finally, we present a practical clustering search
engine developed as a part of this research and use it to get results about
real-world performance of proposed concepts.


title: Monopoles in arbitrary dimension

abstract:
  A self-contained study of monopole configurations of pure Yang-Mills theories
and a discussion of their charges is carried out in the language of principal
bundles. A n-dimensional monopole over the sphere S^n is a particular type of
principal connection on a principal bundle over a symmetric space K/H which is
K-invariant, where K=SO(n+1) and H=SO(n). It is shown that principal bundles
over symmetric spaces admit a unique K-invariant principal connection called
canonical, which also satisfy Yang-Mills equations. The geometrical framework
enables us to describe their associated field strengths in purely algebraic
terms and compute the charge of relevant (Yang-type) monopoles avoiding the use
of coordinates. Besides, two corrections on known results are performed in this
paper. First, it is proven that the Yang monopole should be considered a
connection invariant by Spin(5) instead of by SO(5), as Yang did in his
original article J. Math. Phys. 19(1), pp. 320-328 (1978). Second, unlike the
way suggested in Class. Quantum Grav. 23, pp. 4873-4885 (2006), we give the
correct characteristic class to be used to calculate the charge of the
monopoles studied by Gibbons and Townsend.


title:
Matrix product simulations of non-equilibrium steady states of quantum
  spin chains

abstract:
  Time-dependent density matrix renormalization group method with a matrix
product ansatz is employed for explicit computation of non-equilibrium steady
state density operators of several integrable and non-integrable quantum spin
chains, which are driven far from equilibrium by means of Markovian couplings
to external baths at the two ends. It is argued that even though the
time-evolution can not be simulated efficiently due to fast entanglement
growth, the steady states in and out of equilibrium can be typically accurately
approximated, so that chains of length of the order n ~ 100 are accessible. Our
results are demonstrated by performing explicit simulations of steady states
and calculations of energy/spin densities/currents in several problems of heat
and spin transport in quantum spin chains. Previously conjectured relation
between quantum chaos and normal transport is re-confirmed with high acurracy
on much larger systems.


title: The impact of diffusion on confined oscillated bubbly fluid

abstract:
  We consider the dynamics of monodisperse bubbly fluid confined by two plane
solid walls and subjected to small-amplitude high-frequency transversal
oscillations. The frequency these oscillations is assumed to be high in
comparison with typical relaxation times for a single bubble, but comparable
with the eigenfrequency of volume oscillations. A time-averaged description
accounting for mutual coupling of the phases and the diffusivity of bubbles is
applied. We find nonuniform steady states with the liquid quiescent on average.
At relatively low frequencies accumulation of bubbles either at the walls or in
planes oriented parallel to the walls is detected. These one-dimensional states
are shown to be unstable. At relatively high frequencies the bubbles accumulate
at the central plane and the solution is stable.


title:
The Spitzer Infrared Nearby Galaxies Survey: A High-Resolution
  Spectroscopy Anthology

abstract:
  High resolution mid-infrared spectra are presented for 155 nuclear and
extranuclear regions from the Spitzer Infrared Nearby Galaxies Survey (SINGS).
The fluxes for nine atomic forbidden and three molecular hydrogen mid-infrared
emission lines are also provided, along with upper limits in key lines for
infrared-faint targets. The SINGS sample shows a wide range in the ratio of
[SIII]18.71um/[SIII]33.48um, but the average ratio of the ensemble indicates a
typical interstellar electron density of 300-400 cm^{-3} on ~23"x15" scales and
500-600 cm^{-3} using ~11"x9" apertures, independent of whether the region
probed is a star-forming nuclear, a star-forming extranuclear, or an AGN
environment. Evidence is provided that variations in gas-phase metallicity play
an important role in driving variations in radiation field hardness, as
indicated by [NeIII]15.56um/[NeII]12.81um, for regions powered by star
formation. Conversely, the radiation hardness for galaxy nuclei powered by
accretion around a massive black hole is independent of metal abundance.
Furthermore, for metal-rich environments AGN are distinguishable from
star-forming regions by significantly larger [NeIII]15.56um/[NeII]12.81um
ratios. Finally, [FeII]25.99um/[NeII]12.81um versus [SiII]34.82um/[SIII]33.48um
also provides an empirical method for discerning AGN from normal star-forming
sources. However, similar to [NeIII]15.56um/[NeII]12.81um, these mid-infrared
line ratios lose their AGN/star-formation diagnostic powers for very low
metallicity star-forming systems with hard radiation fields.


title:
Performance of Hybrid-ARQ in Block-Fading Channels: A Fixed Outage
  Probability Analysis

abstract:
  This paper studies the performance of hybrid-ARQ (automatic repeat request)
in Rayleigh block fading channels. The long-term average transmitted rate is
analyzed in a fast-fading scenario where the transmitter only has knowledge of
channel statistics, and, consistent with contemporary wireless systems, rate
adaptation is performed such that a target outage probability (after a maximum
number of H-ARQ rounds) is maintained. H-ARQ allows for early termination once
decoding is possible, and thus is a coarse, and implicit, mechanism for rate
adaptation to the instantaneous channel quality. Although the rate with H-ARQ
is not as large as the ergodic capacity, which is achievable with rate
adaptation to the instantaneous channel conditions, even a few rounds of H-ARQ
make the gap to ergodic capacity reasonably small for operating points of
interest. Furthermore, the rate with H-ARQ provides a significant advantage
compared to systems that do not use H-ARQ and only adapt rate based on the
channel statistics.


title: The Occurrence-in-subtuple problem

abstract:
  As we go along with a bioinformatic analysis we stumbled over a new
combinatorial question. Although the problem is a very special one, there are
maybe more applications than only this one we have. This text is mainly about
the general combinatorial problem, the exact solution and its derivation. An
outline of a real problem of this type is in the discussion.


title: A field evaporation deuterium ion source for neutron generators

abstract:
  Proof-of-principle experiments have demonstrated an electrostatic field
evaporation based deuterium ion source for use in compact, high-output
deuterium-tritium neutron generators. The ion source produces principally
atomic deuterium and titanium ions. More than 100 monolayers of deuterated
titanium thin film can be removed and ionized from a single tip in less than 20
ns. The measurements indicate that with the use of microfabricated tip arrays
the deuterium ion source could provide sufficient ion current to produce 10^9
to 10^10 n/cm^2 of tip array area.


title:
Measurements of W-value, Mobility and Gas Gain in Electronegative
  Gaseous CS2 and CS2 Gas Mixtures

abstract:
  W-value, mobility and gas gain measurements have been carried out in
electronegative gaseous CS2 and CS2 gas mixtures at a pressure of 40 Torr
making use of a single electron proportional counter method. The experimental
results have revealed that W-values obtained for CS2 (40 Torr), CS2-CF4 (30
Torr - 10 Torr), CS2-Ar (35 Torr - 5 Torr), CS2-Ne (35 Torr - 5 Torr) and
CS2-He (35 Torr - 5 Torr) gas mixtures are 21.1+/-2.7(stat)+/-3(syst) eV,
16.4+/-1.8(stat)+/-2(syst) eV, 13.1+/-1.5(stat)+/-2(syst) eV,
16.3+/-3.0(stat)+/-3(syst) eV and 17.3+/-3.0(stat)+/-3(syst) eV. The mobility
for all CS2 gas mixtures was found to be slightly greater and the gas gain was
found to be significantly greater relative to pure CS2.


title: Weyl corrections to holographic conductivity

abstract:
  For conformal field theories which admit a dual gravitational description in
anti-de Sitter space, electrical transport properties, such as conductivity and
charge diffusion, are determined by the dynamics of a U(1) gauge field in the
bulk and thus obey universality relations at the classical level due to the
uniqueness of the Maxwell action. We analyze corrections to these transport
parameters due to higher-dimension operators in the bulk action, beyond the
leading Maxwell term, of which the most significant involves a coupling to the
bulk Weyl tensor. We show that the ensuing corrections to conductivity and the
diffusion constant break the universal relation with the U(1) central charge
observed at leading order, but are nonetheless subject to interesting bounds
associated with causality in the boundary CFT.


title:
Chiral-odd generalized parton distributions, transversity decomposition
  of angular momentum, and tensor charges of the nucleon

abstract:
  The forward limit of the chiral-odd generalized parton distributions (GPDs)
and their lower moments are investigated within the framework of the chiral
quark soliton model (CQSM), with particular emphasis upon the transversity
decomposition of nucleon angular momentum proposed by Burkardt. A strong
correlation between quark spin and orbital angular momentum inside the nucleon
is manifest itself in the derived second moment sum rule within the CQSM,
thereby providing with an additional support to the qualitative connection
between chiral-odd GPDs and the Boer-Mulders effects. We further confirm
isoscalar dominance of the corresponding first moment sum rule, which indicates
that the Boer-Mulders functions for the $u$- and $d$-quarks have roughly equal
magnitude with the same sign. Also made are some comments on the recent
empirical extraction of the tensor charges of the nucleon by Anselmino et al.
We demonstrate that a comparison of their result with any theoretical
predictions must be done with great care, in consideration of fairly strong
scale dependence of tensor charges, especially at lower renormalization scale.