title: FMR Study of Co/Ti Bilayer Thin Films

abstract:
  . We focused on the interaction between two ferromagnetic cobalt layers
through a non-magnetic titanium layer. The magnetic properties of the structure
were characterized by ferromagnetic resonance technique (FMR). The data were
collected as a function of non-magnetic titanium layer thickness. Co/Ti
multilayer (Ti (50 {\AA})/Co(45 {\AA})/Ti(2-40 {\AA})/Co(40 {\AA})/Ti(100
{\AA}))films were grown onto naturally oxidized p-type single crystal Si (100)
substrate at UHV condition with magnetron sputtering system at room
temperature. The thickness of Ti spacer layer ranges from 2 to 40 {\AA} with 2
{\AA} steps. We did not observe usual optic and acoustic modes; instead we had
two broad overlapped peaks for the films ranged from 6 {\AA} to 40 {\AA}. One
interesting result was the high anisotropic resonance field values for these
films. Exchange coupling between ferromagnetic layers causes shift on resonance
field values but these shifts in our samples were much larger than expected.
This large anisotropic behavior is not clear at the moment. Our theoretical
model was not able to determine a value for the exchange coupling parameter.
One reason can be the close thickness values for Co sublayers. The other reason
can be the Ti non-magnetic layer. If titanium did not grow layer by layer on
cobalt, the cobalt ferromagnetic layers may behave as a single layer. As a
result one cannot observe exchange interaction between ferromagnetic layers
through non-magnetic spacer.


title: Metallicity and kinematics of the bar in-situ

abstract:
  Constraints on the Galactic bulge/bar structure and formation history from
stellar kinematics and metallicities mainly come from relatively high-latitude
fields (|b|>4) where a complex mix of stellar population is seen. We aim here
to constrain the formation history of the Galactic bar by studying the radial
velocity and metallicity distributions of stars in-situ (|b|<1). We observed
red clump stars in four fields along the bar's major axis (l=10,6,-6 and b=0
plus a field at l=0,b=1) with low-resolution spectroscopy from VLT/FLAMES,
observing around the CaII triplet. We developed robust methods for extracting
radial velocity and metallicity estimates from these low signal-to-noise
spectra. We derived distance probability distributions using Bayesian methods
rigorously handling the extinction law. We present radial velocities and
metallicity distributions, as well as radial velocity trends with distance. We
observe an increase in the radial velocity dispersion near the Galactic plane.
We detect the streaming motion of the stars induced by the bar in fields at
l=+/-6, the highest velocity components of this bar stream being metal-rich
([Fe/H]~0.2 dex). Our data is consistent with a bar inclined at 26+/-3 from the
Sun-Galactic centre line. We observe a significant fraction of metal-poor
stars, in particular in the field at l=0,b=1. We confirm the flattening of the
metallicity gradient along the minor axis when getting closer to the plane,
with a hint that it could actually be inverted. Our stellar kinematics
corresponds to the expected behaviour of a bar issued from the secular
evolution of the Galactic disc. The mix of several populations, seen further
away from the plane, is also seen in the bar in-situ since our metallicity
distributions highlight a different spatial distribution between metal-poor and
metal-rich stars, the more metal-poor stars being more centrally concentrated.


title:
A PSO and Pattern Search based Memetic Algorithm for SVMs Parameters
  Optimization

abstract:
  Addressing the issue of SVMs parameters optimization, this study proposes an
efficient memetic algorithm based on Particle Swarm Optimization algorithm
(PSO) and Pattern Search (PS). In the proposed memetic algorithm, PSO is
responsible for exploration of the search space and the detection of the
potential regions with optimum solutions, while pattern search (PS) is used to
produce an effective exploitation on the potential regions obtained by PSO.
Moreover, a novel probabilistic selection strategy is proposed to select the
appropriate individuals among the current population to undergo local
refinement, keeping a well balance between exploration and exploitation.
Experimental results confirm that the local refinement with PS and our proposed
selection strategy are effective, and finally demonstrate effectiveness and
robustness of the proposed PSO-PS based MA for SVMs parameters optimization.


title: Recursion Formulas for HOMFLY and Kauffman Invariants

abstract:
  In this note we describe the recursion relations between two parameter HOMLFY
and Kauffman polynomials of framed links These relation correspond to
embeddings of quantized universal enveloping algebras. The relation
corresponding to embeddings $g_{n}\supset g_{k}\times sl_{n-k}$ where $g_{n}$
is either $so_{2n+1}$, $so_{2n}$ or $sp_{2n}$ is new.


title: Geometric construction of generators of CoHA of doubled quiver

abstract:
  Let $Q$ be the doubled of a quiver. According to Efimov, Kontsevich and
Soibelman, the cohomological Hall algebra (CoHA) associated to $Q$ is a free
super-commutative algebra. In this short note, we confirm a conjecture of
Hausel which gives a geometric realisation of the generators of the CoHA.


title:
A multipurpose action for learning-teaching process: The Pigelleto's
  Summer School of Physics

abstract:
  Since 2006, forty students from high school are selected to attend a full
immersion summer school of physics in the Pigelleto Natural Reserve, on the
south east side of Mount Amiata in the province of Siena. Topics are chosen so
that students are involved in activities rarely pursued in high school, aspects
and relationship with society are underlined and discussed. Our purpose is
offering to really motivated students an opportunity of testing the scientific
method, the laboratory experience in a stimulating context, by deepening an
interesting and relevant topic in order to orienting them towards physics.
Students are encouraged in cooperating in small groups in order to present and
share the achieved results. Starting from the third edition of the school, the
school became a training opportunity for younger teachers which are involved in
programming and realization of selected activities. The laboratory activities
with students are usually supervised by a young and an expert teacher in order
to fix the correct methodology. Recently, young teachers enrolled in a master
in Physics Education tested in the summer school some activity designed in
their courses.


title:
Truncated affine grassmannians and truncated affine Springer fibers for
  $\mathrm{GL}_{3}$

abstract:
  We state a conjecture on how to construct affine pavings for cohomologically
pure projective algebraic varieties, which admit an action of torus such that
the fixed points and $1$-dimensional orbits are finite. Experiments on the
affine grassmannian for $\mathrm{GL}_{3}$ under the guideline of this
conjecture, together with the work of Berenstein-Fomin-Zelevinsky and
Kamnitzer, have led to the conjecture that the truncated affine grassmannians
for $\mathrm{GL}_{r+1}$ admit affine pavings.
  For the group $\mathrm{GL}_{3}$, we construct affine pavings for the
truncated affine grassmannians, and we use it to study the affine Springer
fibers. In particular, we find a family of truncated affine Springer fibers
which are cohomologically pure in the sense of Deligne.


title:
A successful search for hidden Barbarians in the Watsonia asteroid
  family

abstract:
  Barbarians, so named after the prototype of this class (234) Barbara, are a
rare class of asteroids exhibiting anomalous polarimetric properties. Their
very distinctive feature is that they show negative polarization at relatively
large phase-angles, where all 'normal' asteroids show positive polarization.
The origin of the Barbarian phenomenon is unclear, but it seems to be
correlated with the presence of anomalous abundances of spinel, a mineral
usually associated with the so-called Calcium Aluminum-rich inclusions (CAIs)
on meteorites. Since CAIs are samples of the oldest solid matter identified in
our solar system, Barbarians are very interesting targets for investigations.
Inspired by the fact that some of the few known Barbarians are members of, or
very close to the dynamical family of Watsonia, we have checked whether this
family is a major repository of Barbarians, in order to obtain some hints about
their possible collisional origin. We have measured the linear polarization of
a sample of nine asteroids which are members of the Watsonia family within the
phase-angle range 17-21 DEG. We found that seven of them exhibit the peculiar
Barbarian polarization signature, and we conclude that the Watsonia family is a
repository of Barbarian asteroids. The new Barbarians identified in our
analysis will be important to confirm the possible link between the Barbarian
phenomenon and the presence of spinel on the surface.


title: Parameter estimation for an expanding universe

abstract:
  We study the parameter estimation for excitations of Dirac fields in the
expanding Robertson-Walker universe. We employ quantum metrology techniques to
demonstrate the possibility for high precision estimation for the volume rate
of the expanding universe. We show that the optimal precision of the estimation
depends sensitively on the dimensionless mass $\tilde{m}$ and dimensionless
momentum $\tilde{k}$ of the Dirac particles. The optimal precision for the
ratio estimation peaks at some finite dimensionless mass $\tilde{m}$ and
momentum $\tilde{k}$. We find that the precision of the estimation can be
improved by choosing the probe state as an eigenvector of the hamiltonian. This
occurs because the largest quantum Fisher information is obtained by performing
projective measurements implemented by the projectors onto the eigenvectors of
specific probe states.


title: Effect of speckle on APSCI method and Mueller Imaging

abstract:
  The principle of the polarimetric imaging method called APSCI (Adapted
Polarization State Contrast Imaging) is to maximize the polarimetric contrast
between an object and its background using specific polarization states of
illumination and detection. We perform here a comparative study of the APSCI
method with existing Classical Mueller Imaging(CMI) associated with polar
decomposition in the presence of fully and partially polarized circular
Gaussian speckle. The results show a noticeable increase of the Bhattacharyya
distance used as our contrast parameter for the APSCI method, especially when
the object and background exhibit several polarimetric properties
simultaneously.


title:
On S. Grivaux' example of a hypercyclic rank one perturbation of a
  unitary operator

abstract:
  Recently, Sophie Grivaux showed that there exists a rank one perturbation of
a unitary operator in a Hilbert space which is hypercyclic. We give a similar
construction using a functional model for rank one perturbations of singular
unitary operators.


title:
The TW Hydrae Association : trigonometric parallaxes and kinematic
  analysis

abstract:
  The nearby TW Hydrae Association (TWA) is currently a benchmark for the study
of formation and evolution of young low-mass stars, circumstellar disks and the
imaging detection of planetary companions. For such studies, it is crucial to
evaluate the distance to group members in order to access their physical
properties. Membership of several stars is strongly debated and age estimates
vary from one author to another with doubts about coevality. We revisit the
kinematic properties of the TWA in light of new trigonometric parallaxes and
proper motions to derive the dynamical age of the association and physical
parameters of kinematic members. Using observations performed with the NTT/ESO
telescope we measured trigonometric parallaxes and proper motions for 13 stars
in TWA. With the convergent point method we identify a co-moving group with 31
TWA stars. We deduce kinematic distances for 7 members of the moving group that
lack trigonometric parallaxes. A traceback strategy is applied to the stellar
space motions of a selection of 16 of the co-moving objects with accurate and
reliable data yielding a dynamical age for the association of t = 7.5 +/- 0.7
Myr. Using our new parallaxes and photometry available in the literature we
derive stellar ages and masses from theoretical evolutionary models. With new
parallax and proper motion measurements from this work and current astrometric
catalogs we provide an improved and accurate database for TWA stars to be used
in kinematical analysis. We conclude that the dynamical age obtained via
traceback strategy is consistent with previous age estimates for the TWA, and
is also compatible with the average ages derived in the present paper from
evolutionary models for pre-main sequence stars.


title:
A counter example to central limit theorem in Hilbert spaces under a
  strong mixing condition

abstract:
  We show that in a separable infinite dimensional Hilbert space, uniform
integrability of the square of the norm of normalized partial sums of a
strictly stationary sequence, together with a strong mixing condition, does not
guarantee the central limit theorem.


title: Quasiparticle generation efficiency in superconducting thin-films

abstract:
  Thin-film superconductors with thickness 30 to 500 nm are used as
non-equilibrium quantum detectors for photons, phonons or more exotic
particles. One of the most basic questions in determining their limiting
sensitivity is the efficiency with which the quanta of interest couple to the
detected quasiparticles. As low temperature superconducting resonators,
thin-films are attractive candidates for producing quantum-sensitive arrayable
sensors and the readout uses an additional microwave probe. We have calculated
the quasiparticle generation efficiency eta_s for low energy photons in a
representative, clean thin-film superconductor (Al) operating well-below its
superconductingtransition temperature as a function of film thickness, within
the framework of the coupled kineticequations described by Chang and
Scalapino.[J. J. Chang and D. J. Scalapino, J. Low Temp. Phys. 31, 1 (1978)].
We have also included the effect of a lower frequency probe. We show that
phonon loss from the thin-film reduces eta_s by as much as 40% compared to
earlier models that considered relatively thick films or infinite volumes. We
also show that the presence of the probe and signal enhances the generation
efficiency slightly. We conclude that the ultimate limiting noise equivalent
power of this class of detector is determined by the thin-film geometry.


title: Complete sets of observables in pseudoscalar-meson photoproduction

abstract:
  Pseudoscalar-meson photoproduction is characterized by four complex reaction
amplitudes. A complete set is a minimum theoretical set of observables that
allow to determine these amplitudes unambiguously. It is studied whether
complete sets remain complete when experimental uncertainty is involved. To
this end, data from the GRAAL Collaboration and simulated data from a realistic
model, both for the $\gamma p \to K^+ \Lambda$ reaction, are analyzed in the
transversity representation of the reaction amplitudes. It is found that only
the moduli of the transversity amplitudes can be determined without ambiguity
but not the relative phases.


title: Towards a high-precision measurement of the antiproton magnetic moment

abstract:
  The recent observation of single spins flips with a single proton in a
Penning trap opens the way to measure the proton magnetic moment with high
precision. Based on this success, which has been achieved with our apparatus at
the University of Mainz, we demonstrated recently the first application of the
so called double Penning-trap method with a single proton. This is a major step
towards a measurement of the proton magnetic moment with ppb precision. To
apply this method to a single trapped antiproton our collaboration is currently
setting up a companion experiment at the antiproton decelerator of CERN. This
effort is recognized as the Baryon Antibaryon Symmetry Experiment (BASE). A
comparison of both magnetic moment values will provide a stringent test of CPT
invariance with baryons.


title: Graphs that allow all the eigenvalue multiplicities to be even

abstract:
  Let $G$ be an undirected graph on $n$ vertices and let $S(G)$ be the set of
all $n \times n$ real symmetric matrices whose nonzero off-diagonal entries
occur in exactly the positions corresponding to the edges of $G$. The inverse
eigenvalue problem for a graph $G$ is a problem of determining all possible
lists that can occur as the lists of eigenvalues of matrices in $S(G).$ This
question is, in general, hard to answer and several variations were studied,
most notably the minimum rank problem. In this paper we introduce the problem
of determining for which graphs $G$ there exists a matrix in $S(G)$ whose
characteristic polynomial is a square, i.e. the multiplicities of all its
eigenvalues are even. We solve this question for several families of graphs.


title: The total graphs of finite rings

abstract:
  In this paper we extend the study of total graphs $\tau(R)$ to
non-commutative finite rings $R$. We prove that $\tau(R)$ is connected if and
only if $R$ is not local and we see that in that case $\tau(R)$ is always
Hamiltonian. We also find an upper bound for the domination number of $\tau(R)$
for all finite rings $R$.


title: Test Problem Construction for Single-Objective Bilevel Optimization

abstract:
  In this paper, we propose a procedure for designing controlled test problems
for single-objective bilevel optimization. The construction procedure is
flexible and allows its user to control the different complexities that are to
be included in the test problems independently of each other. In addition to
properties that control the difficulty in convergence, the procedure also
allows the user to introduce difficulties caused by interaction of the two
levels. As a companion to the test problem construction framework, the paper
presents a standard test suite of twelve problems, which includes eight
unconstrained and four constrained problems. Most of the problems are scalable
in terms of variables and constraints. To provide baseline results, we have
solved the proposed test problems using a nested bilevel evolutionary
algorithm. The results can be used for comparison, while evaluating the
performance of any other bilevel optimization algorithm. The codes related to
the paper may be accessed from the website \url{http://bilevel.org}.


title:
Multi-user Scheduling Schemes for Simultaneous Wireless Information and
  Power Transfer Over Fading Channels

abstract:
  In this paper, we study downlink multi-user scheduling for a time-slotted
system with simultaneous wireless information and power transfer. In
particular, in each time slot, a single user is scheduled to receive
information, while the remaining users opportunistically harvest the ambient
radio frequency energy. We devise novel online scheduling schemes in which the
tradeoff between the users' ergodic rates and their average amount of harvested
energy can be controlled. In particular, we modify the well-known maximum
signal-to-noise ratio (SNR) and maximum normalized-SNR (N-SNR) schedulers by
scheduling the user whose SNR/N-SNR has a certain ascending order (selection
order) rather than the maximum one. We refer to these new schemes as
order-based SNR/N-SNR scheduling and show that the lower the selection order,
the higher the average amount of harvested energy in the system at the expense
of a reduced ergodic sum rate. The order-based N-SNR scheduling scheme provides
proportional fairness among the users in terms of both the ergodic achievable
rate and the average harvested energy. Furthermore, we propose an order-based
equal throughput (ET) fair scheduler, which schedules the user having the
minimum moving average throughput out of the users whose N-SNR orders fall into
a given set of allowed orders. We show that this scheme provides the users with
proportionally fair average harvested energies. In this context, we also derive
feasibility conditions for achieving ET with the order-based ET scheduler.
Using the theory of order statistics, the average per-user harvested energy and
ergodic achievable rate of all proposed scheduling schemes are analyzed and
obtained in closed form for independent and non-identically distributed
Rayleigh, Ricean, Nakagami-m, and Weibull fading channels. Our closed-form
analytical results are corroborated by simulations.


title:
Exploiting Frequency and Spatial Dimensions in Small Cell Wireless
  Networks

abstract:
  This paper examines the efficiency of spatial and frequency dimensions in
serving multiple users in the downlink of a small cell wireless network with
randomly deployed access points. For this purpose, the stochastic geometry
framework is incorporated, taking into account the user distribution within
each cell and the effect of sharing the available system resources to multiple
users. An analysis of performance in terms of signal-to-interference-ratio and
achieved user rate is provided that holds under the class of non-cooperative
multiple access schemes. In order to obtain concrete results, two simple
instances of multiple access schemes are considered. It is shown that
performance depends critically on both the availability of frequency and/or
spatial dimensions as well as the way they are employed. In particular,
increasing the number of available frequency dimensions alone is beneficial for
users experiencing large interference, whereas increasing spatial dimensions
without employing frequency dimensions degrades performance. However, best
performance is achieved when both dimensions are combined in serving the users.


title: Adiabaticity condition for non-Hermitian Hamiltonians

abstract:
  We generalize the concept of population for non-Hermitian systems in
different ways and identify the one best suited to characterize adiabaticity.
An approximate adiabaticity criterion consistent with this choice is also
worked out. Examples are provided for different processes involving two-level
atoms with decay.


title:
Hand-guided 3D surface acquisition by combining simple light sectioning
  with real-time algorithms

abstract:
  Precise 3D measurements of rigid surfaces are desired in many fields of
application like quality control or surgery. Often, views from all around the
object have to be acquired for a full 3D description of the object surface. We
present a sensor principle called "Flying Triangulation" which avoids an
elaborate "stop-and-go" procedure. It combines a low-cost classical
light-section sensor with an algorithmic pipeline. A hand-guided sensor
captures a continuous movie of 3D views while being moved around the object.
The views are automatically aligned and the acquired 3D model is displayed in
real time. In contrast to most existing sensors no bandwidth is wasted for
spatial or temporal encoding of the projected lines. Nor is an expensive color
camera necessary for 3D acquisition. The achievable measurement uncertainty and
lateral resolution of the generated 3D data is merely limited by physics. An
alternating projection of vertical and horizontal lines guarantees the
existence of corresponding points in successive 3D views. This enables a
precise registration without surface interpolation. For registration, a variant
of the iterative closest point algorithm - adapted to the specific nature of
our 3D views - is introduced. Furthermore, data reduction and smoothing without
losing lateral resolution as well as the acquisition and mapping of a color
texture is presented. The precision and applicability of the sensor is
demonstrated by simulation and measurement results.


title:
Poles of Karlsruhe-Helsinki KH80 and KA84 solutions extracted by using
  Laurent+Pietarinen method

abstract:
  Poles of partial wave scattering matrices have also in hadron spectroscopy
recently been established as a sole link between experiment and QCD theories
and models [1-4]. We have, however, noticed the fact that Karlsruhe-Helsinki
(KH) partial wave analyses, one of the two partial wave analyses which have
been "above the line" in PDG [1] for over three decades, does calculate and PDG
compiles the abundance of Breit-Wigner (BW) parameters obtained by local BW
fit, but has produced only a limited number of pole information obtained by
using speed plot (SP) method [5]. We stress the fact that in KH method only
Mandelstam analyticity is used as a theoretical constraint, so KH partial wave
solutions are as model independent as possible. Therefore, they represent a
very confident and valuable input, so it is of extreme importance to extract as
many resonance pole parameters from them as possible. In addition, the
troubling fact is that BW parameters given in PDG have been obtained from KH80
solution, while pole parameters have been obtained from KA84 version of KH
solution. To remedy this, we have used newly developed Laurent+Pietarinen
expansion method [6,7] for obtaining pole positions for all partial waves for
KH80 and KA84 solutions, compared them, and shown that the differences in pole
parameters are, with very few discussed exceptions, negligible for all partial
waves. We finally give a full set of pole parameters for both solutions for all
partial waves; results which are until now unpublished.


title: Excitons and stacking order in h-BN

abstract:
  The strong excitonic emission at 5.75 eV of hexagonal boron nitride (h-BN)
makes this material one of the most promising candidate for light emitting
devices in the far ultraviolet (UV). However, single excitons occur only in
perfect monocrystals that are extremely hard to synthesize, while regular h-BN
samples present a complex emission spectrum with several additional peaks. The
microscopic origin of these additional emissions has not yet been understood.
In this work we address this problem using an experimental and theoretical
approach that combines nanometric resolved cathodoluminescence, high resolution
transmission electron microscopy and state of the art theoretical spectroscopy
methods. We demonstrate that emission spectra are strongly inhomogeneus within
individual flakes and that additional excitons occur at structural
deformations, such as faceted plane folds, that lead to local changes of the
h-BN stacking order.


title: Mean value property associated with the Dunkl Laplacian

abstract:
  Let $\Delta_k$ be the Dunkl Laplacian on $\mathbb{R}^d$. The main goal of
this paper is to characterize $\Delta_k$-harmonic functions by means of a mean
value property


title: The Modification of the Nonlinear Guiding Center Theory

abstract:
  We modify the NonLinear Guiding Center (NLGC) theory (Matthaeus et al. 2003)
for perpendicular diffusion by replacing the spectral amplitude of the
two-component model magnetic turbulence with the 2D component one (following
Shalchi 2006), and replacing the constant $a^2$, indicating the degree
particles following magnetic field line, with a variable $a^{\prime 2}$ as a
function of the magnetic turbulence. We combine the modified model with the
NonLinear PArallel (NLPA) diffusion theory (Qin 2007) to solve perpendicular
and parallel diffusion coefficients simultaneously. It is shown that the new
model agrees better with simulations. Furthermore, we fit the numerical results
of the new model with polynomials, so that parallel and perpendicular diffusion
coefficients can be calculated directly without iteration of integrations, and
many numerical calculations can be reduced.


title: Spectral theoretic characterization of the massless Dirac action

abstract:
  We consider an elliptic self-adjoint first order differential operator L
acting on pairs (2-columns) of complex-valued half-densities over a connected
compact 3-dimensional manifold without boundary. The principal symbol of the
operator L is assumed to be trace-free and the subprincipal symbol is assumed
to be zero. Given a positive scalar weight function, we study the weighted
eigenvalue problem for the operator L. The corresponding counting function
(number of eigenvalues between zero and a positive lambda) is known to admit,
under appropriate assumptions on periodic trajectories, a two-term asymptotic
expansion as lambda tends to plus infinity and we have recently derived an
explicit formula for the second asymptotic coefficient. The purpose of this
paper is to establish the geometric meaning of the second asymptotic
coefficient. To this end, we identify the geometric objects encoded within our
eigenvalue problem - metric, nonvanishing spinor field and topological charge -
and express our asymptotic coefficients in terms of these geometric objects. We
prove that the second asymptotic coefficient of the counting function has the
geometric meaning of the massless Dirac action.


title: V1117 Her: A Herbig Ae star at high Galactic latitude?

abstract:
  We examine the long-term light curve, optical spectrum, spectral energy
distribution, and Galactic location of V1117 Her in order to establish its
nature. V1117 Her is most probably a young intermediate-mass star whose cyclic
brightness dimmings are caused by changing circumstellar dust structures.


title: Gromov width and uniruling for orientable Lagrangian surfaces

abstract:
  We prove a conjecture of Barraud-Cornea for orientable Lagrangian surfaces.
As a corollary, we obtain that displaceable Lagrangian 2--tori have finite
Gromov width. In order to do so, we adapt the pearl complex of Biran-Cornea to
the non-monotone situation based on index restrictions for holomorphic discs.


title: Refined wing asymptotics for the Merton and Kou jump diffusion models

abstract:
  Refining previously known estimates, we give large-strike asymptotics for the
implied volatility of Merton's and Kou's jump diffusion models. They are
deduced from call price approximations by transfer results of Gao and Lee. For
the Merton model, we also analyse the density of the underlying and show that
it features an interesting "almost power law" tail.


title: Towards superlattices: Lateral bipolar multibarriers in graphene

abstract:
  We report on transport properties of monolayer graphene with a laterally
modulated potential profile, employing striped top gate electrodes with
spacings of 100 nm to 200 nm. Tuning of top and back gate voltages gives rise
to local charge carrier density disparities, enabling the investigation of
transport properties either in the unipolar (nn') or the bipolar (np') regime.
In the latter pronounced single- and multibarrier Fabry-Perot (FP) resonances
occur. We present measurements of different devices with different numbers of
top gate stripes and spacings. The data are highly consistent with a phase
coherent ballistic tight binding calculation and quantum capacitance model,
whereas a superlattice effect and modification of band structure can be
excluded.


title: Secants of minuscule and cominuscule minimal orbits

abstract:
  We study the geometry of the secant and tangential variety of a cominuscule
and minuscule variety, e.g. a Grassmannian or a spinor variety. Using methods
inspired by statistics we provide an explicit local isomorphism with a product
of an affine space with a variety which is the Zariski closure of the image of
a map defined by generalized determinants. In particular, equations of the
secant or tangential variety correspond to relations among generalized
determinants. We also provide a representation theoretic decomposition of
cubics in the ideal of the secant variety of any Grassmannian.


title: Universal quasinormal modes of large D black holes

abstract:
  We show that in the limit where the number of spacetime dimensions D grows to
infinity a very large class of black holes (including non-extremal, static,
asymptotically flat ones, with any number of gauge-field charges, possibly
coupled to dilatons) possess a universal set of quasinormal modes whose complex
frequencies depend only on the horizon radius and no other black hole
parameters. The damping ratio of these modes vanishes like $D^{-2/3}$, so they
are almost normal modes, or 'quasi-particle' excitations of the black hole. The
structure responsible for the existence of these modes at large D is also
present very generally in other black holes.


title:
Detecting gravitational waves from the galactic center with Pulsar
  Timing

abstract:
  Black holes orbiting the Super Massive Black Hole (SMBH) Sgr A* in the
Milky-way galaxy center (GC) generate gravitational waves. The spectrum, due to
stars and black holes, is continuous below 40 nHz while individual BHs within
about 200 AU of the central SMBH stick out in the spectrum at higher
frequencies. The GWs can be detected by timing radio pulsars within a few
parsecs of this region. Future observations with the Square Kilometer Array of
such pulsars with sufficient timing accuracy may be sensitive to signals from
intermediate mass BHs (IMBH) in a 3 year observation baseline. The recent
detection of radio pulsations from the magnetar SGR J1745-29 very near the GC
opens up the possibilities of detecting millisecond pulsars (which can be used
as probes of the GWs) through lines of sight with only moderate pulse and
angular broadening due to scattering.


title: The general property of dynamical quintessence field

abstract:
  We discuss the general dynamical behaviors of quintessence field, in
particular, the general conditions for tracking and thawing solutions are
discussed. We explain what the tracking solutions mean and in what sense the
results depend on the initial conditions. Based on the definition of tracking
solution, we give a simple explanation on the existence of a general relation
between $w_\phi$ and $\Omega_\phi$ which is independent of the initial
conditions for the tracking solution. A more general tracker theorem which
requires large initial values of the roll parameter is then proposed. To get
thawing solutions, the initial value of the roll parameter needs to be small.
The power-law and pseudo-Nambu Goldstone boson potentials are used to discuss
the tracking and thawing solutions. A more general $w_\phi-\Omega_\phi$
relation is derived for the thawing solutions. Based on the asymptotical
behavior of the $w_\phi-\Omega_\phi$ relation, the flow parameter is used to
give an upper limit on $w_\phi'$ for the thawing solutions. If we use the
observational constraint $w_{\phi 0}<-0.8$ and $0.2<\Omega_{m0}<0.4$, then we
require $n\lesssim 1$ for the inverse power-law potential
$V(\phi)=V_0(\phi/m_{pl})^{-n}$ with tracking solutions and the initial value
of the roll parameter $|\lambda_i|<1.3$ for the potentials with the thawing
solutions.


title:
Critical and Gaussian conductivity fluctuations in BaFe1.9Ni0.1As2
  superconductor

abstract:
  We study fluctuation conductivity in a single crystal of
BaFe$_{1.9}$Ni$_{0.1}$As$_2$ superconductor ($T_c$ = 20 K) as a function of
temperature and applied magnetic field. Magneto-conductivity curves, $\Delta
\sigma$ vs. $T$, were analyzed in terms of -1/(dln($\Delta \sigma$)/d$T$) vs.
$T$ plots, which allow to study different fluctuations regimes and to estimate
exponent values and temperature widths of each regime. The analysis of
magneto-conductivity curves evidence the existence of only two fluctuations
regimes, a possible critical one (of glass-like type) going from the
irreversible temperature to above $T_c(H)$ followed by Aslamazov-Larkin
fluctuations in the Gaussian regime.


title:
On the effective Dirac equation for ultracold atoms in optical lattices:
  role of the localization properties of the Wannier functions

abstract:
  We review the derivation of the effective Dirac equation for ultracold atoms
in one-dimensional bichromatic optical lattices, following the proposal by
Witthaut et al. Phys. Rev. A 84, 033601 (2011). We discuss how such a
derivation - based on a suitable rotation of the Bloch basis and on a coarse
graining approximation - is affected by the choice of the Wannier functions
entering the coarsening procedure. We show that in general the Wannier
functions obtained by rotating the maximally localized Wannier functions for
the original Bloch bands can be sufficiently localized for justifying the
coarse graining approximation. We also comment on the relation between the
rotation needed to achieve the Dirac form and the standard Foldy-Wouthuysen
transformation. Our results provide a solid ground for the interpretation of
the experimental results by Salger et al. Phys. Rev. Lett. 107, 240401 (2011)
in terms of an effective Dirac dynamics.


title:
Study of sunspot group morphological variations leading to flaring
  events

abstract:
  It is widely assumed that the most probable sites of flare occurrences are
the locations of high horizontal magnetic field gradients in the active
regions. Instead of magnetograms the present work checks this assumption by
using sunspot data, the targeted phenomenon is the pre-flare behaviour of the
strong horizontal gradients of the magnetic field at the location of the flare.
The empirical basis of the work is the SDD (SOHO/MDI-Debrecen sunspot Data)
sunspot catalogue. Case studies of two active regions and five X-flares have
been carried out to find possible candidates for pre-flare signatures. It has
been found that the following properties of the temporal variations of
horizontal magnetic field gradient are promising for flare forecast: the speed
of its growth, its maximal value, its decrease after the maximum until the
flare and the rate of its fluctuation.


title:
Functionalization of Amorphous Chalcogenide and Titanium Oxide Layers by
  Gold Nanoparticles

abstract:
  The technology problems of fabricating different, nanometers sized gold
particles in the layered composites like light-sensitive chalcogenide
glass/gold nanoparticles/transparent substrate or titanium/titanium oxide/gold
nanoparticles were investigated in our work. Combination of ion implantation,
plasma deposition with annealing processes results physical routes for creation
of gold nanoparticles in the mentioned structures, which possess plasmon
effects. These functionalized structures are planned to use for investigations
of optical recording processes, biocompatibility of titanium implants.


title:
Frequency and spectrum analysis of $\gamma$ Doradus type Kepler target
  KIC 6462033

abstract:
  We present results of an asteroseismic study on the $\gamma$ Dor type {\it
Kepler} target KIC\,6462033. {\it Kepler} photometry is used to derive the
frequency content and principal modes. High-dispersion ground-based
spectroscopy is also carried out in order to determine the atmospheric
parameters and projected rotational velocity. From an analysis of the {\it
Kepler} long cadence time series, we find that the light curve of KIC\,6462033
is dominated by three modes with frequencies $f_{1}$=0.92527, $f_{2}$=2.03656
and $f_{3}$=1.42972 d$^{-1}$ as well as we detect more than a few hundreds of
combination terms. However, two other independent frequencies appear to have
lower amplitudes in addition to these three dominant terms. No significant
peaks are detected in the region $>$ 5 d$^{-1}$. We therefore confirm that
KIC\,6462033 pulsates in the frequency range of $\gamma$ Dor type variables,
and a future study will allow us to investigate modal behaviour in this star.


title: Microwave Assisted Synthesis and Characterization of Perovskite Oxides

abstract:
  The use of microwave irradiation is a promising alternative heat source for
the synthesis of inorganic materials such as perovskite oxides. The method
offers massive energy and time savings as compared to the traditional ceramic
method. In this work we review the basic principles of the microwave heating
mechanism based on interactions between dipoles in the material and the
electromagnetic microwave. Furthermore, we comment on and classify all
different sub-types of microwave synthesis such as solid-state microwave and
microwave assisted hydrothermal synthesis. In the experimental part of this
work we present a large range of materials that were synthesized in our
laboratories by one of the microwave techniques, where such materials include
superconducting, ferromagnetic, ferroelectric, dielectric and multiferroic
perovskite systems.


title:
The Finsler Metric Obtained as the $\Gamma$-limit of a Generalised
  Manhattan Metric

abstract:
  The $\Gamma$-limit for a sequence of length functionals associated with a one
parameter family of Riemannian manifolds is computed analytically. The
Riemannian manifold is of `two-phase' type, that is, the metric coefficient
takes values in $\{1,\beta\}$, with $\beta$ sufficiently large. The metric
coefficient takes the value $\beta$ on squares, the size of which are
controlled by a single parameter. We find a family of examples of limiting
Finsler metrics that are piecewise affine with infinitely many lines of
discontinuity. Such an example provides insight into how the limit metric
behaves under variations of the underlying microscopic Riemannian geometry,
with implications for attempts to compute such metrics numerically.


title:
Electronic properties and morphology of Cu-Phthalocyanine - C$_{60}$
  composite mixtures

abstract:
  Phthalocyanines in combination with C$_{60}$ are benchmark materials for
organic solar cells. Here we have studied the morphology and electronic
properties of co-deposited mixtures (blends) of these materials forming a bulk
heterojunction as a function of the concentration of the two constituents. For
a concentration of 1:1 of CuPc:C$_{60}$ a phase separation into about 100 nm
size domains is observed, which results in electronic properties similar to
layered systems. For low C$_{60}$ concentrations (10:1 CuPc:C$_{60}$) the
morphology, as indicated by Low-Energy Electron Microscopy (LEEM) images,
suggests a growth mode characterized by (amorphous) domains of CuPC, whereby
the domain boundaries are decorated with C$_{60}$. Despite of these markedly
different growth modes, the electronic properties of the heterojunction films
are essentially unchanged.


title: N=1 super-Chern-Simons theory in Batalin-Vilkovisky formulation

abstract:
  We analyse the Abelian $N=1$ super-Chern-Simons model coupled to
parity-preserving matter in linear and non-linear gauges with exact BRST
invariance. Then we analyse the theory in field/antifield formulation to
discuss the model at quantum level. Furthermore, we implement the
field/antifield dependent transformation parameter to generalize the BRST
symmetry of the theory. The novelty of field/antifield dependent BRST
transformation is that under change of variable the Jacobian of the functional
integral extends the quantum action from linear gauge to non-linear gauge. The
results are established in full generality.


title:
Rational and global forms of certain Chiral Conformal Field Theories;
  Vertex Algebras I

abstract:
  We present explicit global constructions - avoiding power series - of certain
chiral CFTs, including current algebras on the projective line. We outline an
approach to vertex algebras, inspired by this construction. We construct
natural pairings on state spaces.


title:
On the mid-IR variability of candidate eruptive variables (EXors): a
  comparison between Spitzer and WISE data

abstract:
  Aiming to statistically study the variability in the mid-IR of young stellar
objects, we have compared the 3.6, 4.5, and 24 um Spitzer fluxes of 1478
sources belonging to the C2D (Cores to Disks) legacy program with the WISE
fluxes at 3.4, 4.6, and 22 um. From this comparison we have selected a robust
sample of 34 variable sources. Their variations were classified per spectral
Class (according to the widely accepted scheme of Class I/flat/II/III
protostars), and per star forming region. On average, the number of variable
sources decreases with increasing Class and is definitely higher in Perseus and
Ophiuchus than in Chamaeleon and Lupus. According to the paradigm Class <=>
Evolution, the photometric variability can be considered to be a feature more
pronounced in less evolved protostars, and, as such, related to accretion
processes. Moreover, our statistical findings agree with the current knowledge
of the star formation activity in different regions. The 34 selected variables
were further investigated for similarities with known young eruptive variables,
namely the EXors. In particular we analyzed : (1) the shape of the spectral
energy distribution (SED); (2) the IR excess over the stellar photosphere; (3)
magnitude versus color variations; and (4) output parameters of model fitting.
This first systematic search for EXors ends up with 11 bona fide candidates
that can be considered as suitable targets for monitoring or future
investigations.


title: Two-step measurement of the concurrence for hyperentangled state

abstract:
  We describe an efficient way for measuring the concurrence of the
hyperentanglement. In this protocol, the hyperentangled state is encoded in
both polarization and momentum degrees of freedom. We show that the
concurrences of both polarization and momentum entanglement can be conversed
into the total success probability of picking up the odd-parity state and can
be measured directly. This protocol requires the weak cross-Kerr nonlinearity
to construct the quantum nondemolition measurement and does not resort to the
sophisticated controlled-not gate operation. It is feasible in current
experimental technology.


title: A magnetar powering the ordinary monster GRB 130427A?

abstract:
  We present the analysis of the extraordinarily bright Gamma-Ray Burst (GRB)
130427A under the hypothesis that the GRB central engine is an
accretion-powered magnetar. In this framework, initially proposed to explain
GRBs with precursor activity, the prompt emission is produced by accretion of
matter onto a newly-born magnetar, and the observed power is related to the
accretion rate. The emission is eventually halted if the centrifugal forces are
able to pause accretion. We show that the X-ray and optical afterglow is well
explained as the forward shock emission with a jet break plus a contribution
from the spin-down of the magnetar. Our modelling does not require any
contribution from the reverse shock, that may still influence the afterglow
light curve at radio and mm frequencies, or in the optical at early times. We
derive the magnetic field ($B\sim 10^{16}$ G) and the spin period ($P\sim 20$
ms) of the magnetar and obtain an independent estimate of the minimum
luminosity for accretion. This minimum luminosity results well below the prompt
emission luminosity of GRB 130427A, providing a strong consistency check for
the scenario where the entire prompt emission is the result of continuous
accretion onto the magnetar. This is in agreement with the relatively long spin
period of the magnetar. GRB 130427A was a well monitored GRB showing a very
standard behavior and, thus, is a well-suited benchmark to show that an
accretion-powered magnetar gives a unique view of the properties of long GRBs.


title:
Jets in multiparticle production in and beyond geometry of proton-proton
  collisions at the LHC

abstract:
  Experimental findings of CMS on properties of jets and underlying events at
high multiplicities in proton-proton interactions at 7 TeV are interpreted as
an indication of increasing role of central collisions with small impact
parameters. We find an indication that the rates of different hard processes
observed by CMS and ALICE universally depend on underlying event
charged-particles multiplicity until it becomes four times more than average.
It is shown that the increase of the overlap area of colliding protons is not
sufficient for explanation of the rate of jet production in events with
charged-particle multiplicity three times higher than average and some new
mechanisms are necessary like interaction of protons in rare configurations of
higher than average gluon density. Such mechanisms are not included in the
present Monte Carlo event generators. Further studies are proposed


title: Bayesian Nonparametric Multilevel Clustering with Group-Level Contexts

abstract:
  We present a Bayesian nonparametric framework for multilevel clustering which
utilizes group-level context information to simultaneously discover
low-dimensional structures of the group contents and partitions groups into
clusters. Using the Dirichlet process as the building block, our model
constructs a product base-measure with a nested structure to accommodate
content and context observations at multiple levels. The proposed model
possesses properties that link the nested Dirichlet processes (nDP) and the
Dirichlet process mixture models (DPM) in an interesting way: integrating out
all contents results in the DPM over contexts, whereas integrating out
group-specific contexts results in the nDP mixture over content variables. We
provide a Polya-urn view of the model and an efficient collapsed Gibbs
inference procedure. Extensive experiments on real-world datasets demonstrate
the advantage of utilizing context information via our model in both text and
image domains.


title:
Revealing a new charge density wave order in TbTe$_3$ by optical
  conductivity and ultrafast pump-probe experiments

abstract:
  Rare-earth tri-tellurium RTe$_3$ is a typical quasi-two dimensional system
which exhibits obvious charge density wave (CDW) orders. So far, RTe$_3$ with
heavier R ions (Dy, Ho, Er and Tm) are believed to experience two CDW phase
transitions, while the lighter ones only hold one. TbTe$_3$ is claimed to
belong to the latter. However in this work we present evidences that TbTe$_3$
also possesses more than one CDW order. Aside from the one at 336 K, which was
extensively studied and reported to be driven by imperfect Fermi surface
nesting with a wave vector $q=(2/7 c^*)$, a new CDW energy gap (260 meV)
develops at around 165 K, revealed by both infrared reflectivity spectroscopy
and ultrafast pump-probe spectroscopy. More intriguingly, the origin of this
energy gap is different from the second CDW order in the heavier R ions-based
compounds RTe$_3$ (R=Dy, Ho, Er and Tm).


title: What is a horocyclic product, and how is it related to lamplighters?

abstract:
  This is a rather personal introductory outline of an interesting class of
geometric, resp. graph- and group-theoretical structures. After an introductive
section about their genesis, the general construction of horocyclic products is
presented. Three closely related basic structures of this type are explained in
more detail: Diestel-Leader graphs, treebolic spaces, and Sol-groups, resp.
-manifolds. Emphasis is on their geometry, isometry groups, quasi-isometry
classification and boundary at infinity. Subsequently, it is clarified under
which parametrisation they admit discrete groups of isometries acting with
compact quotient. Finally, further develpoments are reviewed briefly.
  Remark: the posted version contains a correction of a misprint that appeared
on the bottom of page 22 in the version which appeared in IMN.


title: Robust Energy Management for Green and Survivable IP Networks

abstract:
  Despite the growing necessity to make Internet greener, it is worth pointing
out that energy-aware strategies to minimize network energy consumption must
not undermine the normal network operation. In particular, two very important
issues that may limit the application of green networking techniques concern,
respectively, network survivability, i.e. the network capability to react to
device failures, and robustness to traffic variations. We propose novel
modelling techniques to minimize the daily energy consumption of IP networks,
while explicitly guaranteeing, in addition to typical QoS requirements, both
network survivability and robustness to traffic variations. The impact of such
limitations on final network consumption is exhaustively investigated. Daily
traffic variations are modelled by dividing a single day into multiple time
intervals (multi-period problem), and network consumption is reduced by putting
to sleep idle line cards and chassis. To preserve network resiliency we
consider two different protection schemes, i.e. dedicated and shared
protection, according to which a backup path is assigned to each demand and a
certain amount of spare capacity has to be available on each link. Robustness
to traffic variations is provided by means of a specific modelling framework
that allows to tune the conservatism degree of the solutions and to take into
account load variations of different magnitude. Furthermore, we impose some
inter-period constraints necessary to guarantee network stability and preserve
the device lifetime. Both exact and heuristic methods are proposed.
Experimentations carried out with realistic networks operated with flow-based
routing protocols (i.e. MPLS) show that significant savings, up to 30%, can be
achieved also when both survivability and robustness are fully guaranteed.


title: On the lack of compactness on stratified Lie groups

abstract:
  In $\mathbb{R}^d$, the characterization of the \mbox{lack of compactness of
the continuous Sobolev injection $ \mathring{H}^s \hookrightarrow L^p $}, with
$ \displaystyle{\frac{s}{d} + \frac{1}{p} = \frac{1}{2}} $ and $\displaystyle{0


title: The K($\pi$,1)-property for marked curves over finite fields

abstract:
  We investigate the K($\pi$,1)-property for p of smooth, marked curves (X,T)
defined over finite fields of characteristic p. We prove that (X,T) has the
K($\pi$,1)-property if X is affine and give positive and negative examples in
the proper case. We also consider the unmarked proper case over a finite field
of characteristic different to p.


title: Finite metacyclic groups as active sums of cyclic subgroups

abstract:
  The notion of active sum provides an analogue for groups of that of direct
sum for abelian groups. One natural question then is which groups are the
active sum of cyclic subgroups. Many groups have been found to give a positive
answer to this question, while the case of finite metacyclic groups remained
unknown. In this note we show that every finite metacyclic group can be
recovered as the active sum of a discrete family of cyclic subgroups.


title:
Spin-isospin Response in Finite Nuclei from an Extended Skyrme
  Interaction

abstract:
  The magnetic dipole (M1) and the Gamow-Teller (GT) excitations of finite
nuclei have been studied in a fully self-consistent Hartree-Fock (HF) plus
random phase approximation (RPA) approach by using a Skyrme energy density
functional with spin and spin-isospin densities. To this end, we adopt the
extended SLy5st interaction which includes spin-density dependent terms and
stabilize nuclear matter with respect to spin instabilities. The effect of the
spin-density dependent terms is examined in both the mean field and the
spin-flip excited state calculations. The numerical results show that those
terms give appreciable repulsive contributions to the M1 and GT response
functions of finite nuclei.


title:
A review of security attacks and Intrusion Detection Schemes in Wireless
  Sensor Networks

abstract:
  Wireless Sensor Networks (WSNs) are currently used in different industrial
and consumer applications, such as earth monitoring, health related
applications, natural disaster prevention, and many other areas. Security is
one of the major aspects of Wireless sensor networks due to the resource
limitations of sensor nodes. However, these networks are facing several threats
that affect their functioning and their life. In this paper we present security
attacks in wireless sensor networks, and we focus on a review and analysis of
the recent Intrusion Detection schemes in WSNs.


title:
Properties of single-particle states in a fully self-consistent
  particle-vibration coupling approach

abstract:
  The properties of single-particle states in the magic nuclei $^{40}$Ca and
$^{208}$Pb, in particular the energies, spectroscopic factors and the effective
mass, have been studied in a fully self-consistent particle-vibration coupling
(PVC) approach within the framework of Skyrme energy density functional theory.
All selected phonons are obtained by the Random Phase Approximation and the
same Skyrme interaction is also used in the PVC vertex. We focus on the effect
of the non-central two-body spin-orbit and tensor interactions on the
single-particle properties. It has been found that the contributions of those
terms are important to improve the results of $^{208}$Pb. The calculated
single-particle energies and spectroscopic factors are compared to available
experimental data. The single-particle level density around the Fermi surface
is significantly increased due to the effect of PVC.


title: The Qatar Exoplanet Survey

abstract:
  The Qatar Exoplanet Survey (QES) is discovering hot Jupiters and aims to
discover hot Saturns and hot Neptunes that transit in front of relatively
bright host stars. QES currently operates a robotic wide-angle camera system to
identify promising transiting exoplanet candidates among which are the
confirmed exoplanets Qatar 1b and 2b. This paper describes the first generation
QES instrument, observing strategy, data reduction techniques, and follow-up
procedures. The QES cameras in New Mexico complement the SuperWASP cameras in
the Canary Islands and South Africa, and we have developed tools to enable the
QES images and light curves to be archived and analysed using the same methods
developed for the SuperWASP datasets. With its larger aperture, finer pixel
scale, and comparable field of view, and with plans to deploy similar systems
at two further sites, the QES, in collaboration with SuperWASP, should help to
speed the discovery of smaller radius planets transiting bright stars in
northern skies.


title:
Metallicity inhomogeneities in local star-forming galaxies as sign of
  recent metal-poor gas accretion

abstract:
  We measure the oxygen metallicity of the ionized gas along the major axis of
seven dwarf star-forming galaxies. Two of them, SDSSJ1647+21 and SDSSJ2238+14,
show 0.5 dex metallicity decrements in inner regions with enhanced
star-formation activity. This behavior is similar to the metallicity drop
observed in a number of local tadpole galaxies by Sanchez Almeida et al. (2013)
and interpreted as showing early stages of assembling in disk galaxies, with
the star formation sustained by external metal-poor gas accretion. The
agreement with tadpoles has several implications: (1) it proves that galaxies
other than the local tadpoles present the same unusual metallicity pattern. (2)
Our metallicity inhomogeneities were inferred using the direct method, thus
discarding systematic errors usually attributed to other methods. (3) Taken
together with the tadpole data, our findings suggest a threshold around one
tenth the solar value for the metallicity drops to show up. Although galaxies
with clear metallicity drops are rare, the physical mechanism responsible for
them may sustain a significant part of the star-formation activity in the local
Universe. We argue that the star-formation dependence of the mass-metallicity
relationship, as well as other general properties followed by most local disk
galaxies, are naturally interpreted as side effects of pristine gas infall.
Alternatives to the metal poor gas accretion are examined too.


title:
Quantum Quench and Prethermalization Dynamics in A Two-Dimensional Fermi
  Gas with Long-range Interactions

abstract:
  We study the effect of suddenly turning on a long-range interaction in a
spinless Fermi gas in two dimensions. The short to intermediate time dynamics
is obtained using the method of bosonization of the Fermi surface. This allow
to calculate the full space-time dependence of the non-equilibrium fermion
density matrix as well as the evolution of the quasiparticle residue after the
quench. It is thus found that the asymptotic state predicted by bosonization is
consistent with the prethermalized state. From the bosonized representation, we
explicitly construct the Generalized Gibbs Ensamble that describes the
prethermalized state. A protocol to perform an interaction quantum quench in a
dipolar gas of Erbium atoms is also described.


title: Illusory Flow in Radiation from Accelerating Charge

abstract:
  In this paper we analyze the classical electromagnetic radiation of an
accelerating point charge moving on a straight line trajectory. Depending on
the duration of accelerations, rapidity distributions of photons emerge,
resembling the ones obtained in the framework of hydrodynamical models by
Landau or Bjorken. Detectable differences between our approach and spectra
obtained from hydrodynamical models occur at high transverse momenta and are
due to interference.


title:
Dynamics of the two-dimensional directed Ising model in the paramagnetic
  phase

abstract:
  We consider the non-conserved dynamics of the Ising model on the
two-dimensional square lattice, where each spin is influenced preferentially by
its East and North neighbours. The single-spin flip rates are such that the
stationary state is Gibbsian with respect to the usual ferromagnetic Ising
Hamiltonian. We show the existence, in the paramagnetic phase, of a dynamical
transition between two regimes of violation of the fluctuation-dissipation
theorem in the nonequilibrium stationary state: a regime of weak violation
where the stationary fluctuation-dissipation ratio is finite, when the
asymmetry parameter is less than a threshold value, and a regime of strong
violation where this ratio vanishes asymptotically above the threshold. The
present study suggests that this novel kind of dynamical transition in
nonequilibrium stationary states, already found for the directed Ising chain
and the spherical model with asymmetric dynamics, might be quite general. In
contrast with the later models, the equal-time correlation function for the
two-dimensional directed Ising model depends on the asymmetry.


title:
A Mid-IR comparative analysis of the Seyfert galaxies NGC 7213 and NGC
  1386

abstract:
  New Gemini mid-infrared spectroscopic observations together with Spitzer
Space telescope archival data, are used to study the properties of the dusty
torus and circumnuclear star formation in the active galaxies NGC 7213 and NGC
1386. Our main conclusions can be summarised as follows. Polycyclic aromatic
hydrocarbon (PAH) emission is absent in the T-ReCS nuclear spectra but is
ubiquitous in the data from Spitzer at distances above 100 pc. Star formation
rates surface densities are estimated from the 12.8 $\mu m$ [Ne{\sc ii}] line
strengths leading to values close to 0.1M$_\odot\,\,{\rm yr}^{-1}\,\,{\rm
kpc}^{-2}$. Analogous estimates based on photometric fluxes of IRAC's 8 $\mu m$
images are higher by a factor of almost 15, which could be linked to excitation
of PAH molecules by older stellar populations. T-ReCS high spatial resolution
data reveal silicate absorption at $\lambda$ 9.7 $\mu m$ in the central tens of
parsecs of the Seyfert 2 NGC 1386, and silicate emission in the Seyfert 1
galaxy NGC 7213. In the case of NGC 1386 this feature is confined to the inner
20 pc, implying that the silicate might be linked to the putative dusty torus.
Finally, by fitting CLUMPY models to the T-ReCS nuclear spectra we estimate the
torus physical properties for both galaxies, finding line of sight inclinations
consistent with the AGN unified model.


title:
Brazilian License Plate Detection Using Histogram of Oriented Gradients
  and Sliding Windows

abstract:
  Due to the increasingly need for automatic traffic monitoring, vehicle
license plate detection is of high interest to perform automatic toll
collection, traffic law enforcement, parking lot access control, among others.
In this paper, a sliding window approach based on Histogram of Oriented
Gradients (HOG) features is used for Brazilian license plate detection. This
approach consists in scanning the whole image in a multiscale fashion such that
the license plate is located precisely. The main contribution of this work
consists in a deep study of the best setup for HOG descriptors on the detection
of Brazilian license plates, in which HOG have never been applied before. We
also demonstrate the reliability of this method ensured by a recall higher than
98% (with a precision higher than 78%) in a publicly available data set.


title: The width of the $\omega$ meson in dense matter

abstract:
  We obtain the width of the $\omega$ meson in dense nuclear matter by taking
into account (i) the free decay of the $\omega$ into three pions, which is
dominated by $\rho \pi$ mode, (ii) the processes induced by a vector-baryon
interaction dominated by vector meson exchange, and (iii) the $\omega \to K
\bar K$ mechanism in matter. The $\omega$ meson develops an important width in
matter, coming from the dominant $\omega \to \rho\pi$ decay mode, with a value
of $121 \pm 10$ MeV at normal nuclear matter density for an $\omega$ at rest.
At finite momentum, the width of the $\omega$ meson increases moderately with
values of 200 MeV at 600 MeV/c.


title: Groupes Classiques

abstract:
  We introduce so-called "classical" algebraic group over a general base
scheme, and then place them where they belong in the classification of
reductive groups established in SGA3. We cover the non-split cases and we
describe on the way several categories of torsors.


title: Exclusive production of $W$ pairs in CMS

abstract:
  We report the results on the search for exclusive production of $W$ pairs in
the LHC with data collected by the Compact Muon Solenoid detector in
proton-proton collisions at $\sqrt{s}$ = 7 TeV. The analysis comprises the
two-photon production of a $W$ pairs, ${pp\to p\,W^{+}W^{-}\,p\to p\,\nu
e^{\pm}\nu\mu^{\mp}\,p}$. Two events are observed in data for
$p_{\textrm{\footnotesize T}}(\ell)>$ 4 GeV, $|\eta(\ell)|<$ 2.4 and
$m(\mu^{\pm}e^{\mp})>$ 20 GeV, in agreement with the standard model prediction
of 2.2 $\pm$ 0.4 signal events with 0.84 $\pm$ 0.15 background events.
Moreover, a study of the tail of the lepton pair transverse momentum
distribution is performed to search for an evidence of anomalous quartic gauge
couplings in the $\gamma\gamma\to W^{+}W^{-}$ vertex. As no events are observed
in data, it results in a model-independent upper limits for the anomalous
quartic gauge couplings $a^{W}_{0,C}/\Lambda^{2}$, which are of the order of
10$^{-4}$.


title: On the colour of the dark side of the Moon

abstract:
  Aims. 'Earthshine' is the dim light seen on the otherwise dark side of the
Moon, particularly when it is close to new. 'Earthlight', or reflected sunlight
from the Earth, is the source of Earthshine. Using B and V band CCD images of
both the dark and bright side of the Moon, we aim to estimate the Johnson
photometry B-V colour of the Earthshine for the first time since the late
1960s. From these measurements we are also able to quantify the colour of
Earthlight. Methods. We present images of the Moon taken with a small refractor
in Hawaii, in B and V bands and taken under favourable conditions so that
scattered light in both bands almost completely cancels, yielding a map of the
surface in B-V colour. Co-addition of 100 such images taken in rapid succession
substantially improves the signal to noise ratio, and several sources of
photometric bias are eliminated by use of relative methods. Results. The
earthlit dark side of the Moon is observed to be 0.150 +/- 0.005 mag bluer in
B-V than the sunlit bright side, in good agreement with the only known previous
measurement of this quantity from 1967. Arguing on the basis of the change in B
- V for sunlight reflected once o? the Moon, we derive a colour for earthlight
of B-V = 0.44+/-0.02 mag (without applying a small, uncertain, phase-dependent
reddening correction). The absence of a colour-gradient in the B-V image
implies that the scattering properties of the atmosphere+optical system are
almost exactly matched in the two wavelength bands, the consequences of which
are discussed.


title: Plasma Phenomenology in Astrophysical Systems: Radio-Sources and Jets

abstract:
  We review the plasma phenomenology in the astrophysical sources which show
appreciable radio emissions, namely Radio-Jets from Pulsars, Microquasars,
Quasars and Radio-Active Galaxies. A description of their basic features is
presented, then we discuss in some details the links between their morphology
and the mechanisms that lead to the different radio-emissions, investigating
especially the role played by the plasma configurations surrounding compact
objects (Neutron Stars, Black Holes). For the sake of completeness, we briefly
mention observational techniques and detectors, whose structure set them apart
from other astrophysical instruments. The fundamental ideas concerning Angular
Momentum Transport across plasma accretion disks (together with the
disk-source-jet coupling problem) are discussed, by stressing their successes
and their shortcomings. An alternative scenario is then inferred, based on a
parallelism between astrophysical and laboratory plasma configurations, where
small-scale structures can be found. We will focus our attention on the
morphology of the radio-jets, on their coupling with the accretion disks and on
the possible triggering phenomena, viewed as profiles of plasma instabilities.


title: Emotional Strategies as Catalysts for Cooperation in Signed Networks

abstract:
  The evolution of unconditional cooperation is one of the fundamental problems
in science. A new solution is proposed to solve this puzzle. We treat this
issue with an evolutionary model in which agents play the Prisoner's Dilemma on
signed networks. The topology is allowed to co-evolve with relational signs as
well as with agent strategies. We introduce a strategy that is conditional on
the emotional content embedded in network signs. We show that this strategy
acts as a catalyst and creates favorable conditions for the spread of
unconditional cooperation. In line with the literature, we found evidence that
the evolution of cooperation most likely occurs in networks with relatively
high chances of rewiring and with low likelihood of strategy adoption. While a
low likelihood of rewiring enhances cooperation, a very high likelihood seems
to limit its diffusion. Furthermore, unlike in non-signed networks, cooperation
becomes more prevalent in denser topologies.


title: Arens regularity of projective tensor products

abstract:
  For completely contractive Banach algebras $A$ and $B$ (respectively operator
algebras $A$ and $B$), the necessary and sufficient conditions for the operator
space projective tensor product $A\widehat{\otimes}B$ (respectively the
Haagerup tensor product $A\otimes^{h}B$) to be Arens regular are obtained.
Using the non-commutative Grothendieck's inequality, we show that, for
$C^*$-algebras $A$ and $B$, the Arens regularity of Banach algebras
  $A\otimes^{h}B$, $A\ot^{\gamma} B$, $A\ot^{s} B$ and $A\widehat{\otimes}B$
are equivalent, where $\otimes^h$, $\otimes^{\gamma}$, $\ot^s$ and
$\widehat{\otimes}$ are the Haagerup, the Banach space projective tensor norm,
the Schur tensor norm and the operator space projective tensor norm,
respectively.


title:
Rapid Embedded Wire Heating via Resistive Guiding of Laser-Generated
  Fast Electrons as a Hydrodynamic Driver

abstract:
  Resistively guiding laser-generated fast electron beams in targets consisting
of a resistive wire embedded in lower $Z$ material should allow one to rapidly
heat the wire to over 100eV over a substantial distance without strongly
heating the surrounding material. On the multi-ps timescale this can drive
hydrodynamic motion in the surrounding material. Thus ultra-intense laser solid
interactions have the potential as a controlled driver of radiation
hydrodynamics in solid density material. In this paper we assess the laser and
target parameters needed to achieve such rapid and controlled heating of the
embedded wire.


title:
Extending the Archimedean copula methodology to model multivariate
  survival data grouped in clusters of variable size

abstract:
  For the analysis of clustered survival data, two different types of models
that take the association into account, are commonly used: frailty models and
copula models. Frailty models assume that conditional on a frailty term for
each cluster, the hazard functions of individuals within that cluster are
independent. These unknown frailty terms with their imposed distribution are
used to express the association between the different individuals in a cluster.
Copula models on the other hand assume that the joint survival function of the
individuals within a cluster is given by a copula function, evaluated in the
marginal survival function of each individual. It is the copula function which
describes the association between the lifetimes within a cluster. A major
disadvantage of the present copula models over the frailty models is that the
size of the different clusters must be small and equal in order to set up
manageable estimation procedures for the different model parameters. We
describe in this manuscript a copula model for clustered survival data where
the clusters are allowed to be moderate to large and varying in size by
considering the class of Archimedean copulas with completely monotone
generator. We develop both one- and two-stage estimators for the different
copula parameters. Furthermore we show the consistency and asymptotic normality
of these estimators. Finally, we perform a simulation study to investigate the
finite sample properties of the estimators. We illustrate the method on a data
set containing the time to first insemination in cows, with cows clustered in
herds.


title:
A model project for reproducible papers: critical temperature for the
  Ising model on a square lattice

abstract:
  In this paper we present a simple, yet typical simulation in statistical
physics, consisting of large scale Monte Carlo simulations followed by an
involved statistical analysis of the results. The purpose is to provide an
example publication to explore tools for writing reproducible papers. The
simulation estimates the critical temperature where the Ising model on the
square lattice becomes magnetic to be Tc /J = 2.26934(6) using a finite size
scaling analysis of the crossing points of Binder cumulants. We provide a
virtual machine which can be used to reproduce all figures and results.


title: A study of Monte-Carlo method in a teachers' training institute

abstract:
  The problem of Monte-Carlo method study at computer simulation lessons in a
Teachers' Training Institute is reviewed in the article. The suggested
technique envisages the simulation modelling of various stochastic processes.
They include transmission of information via a communication link, oscillation
of a pendulum in an air stream, deflection of alpha particles by Au atoms,
formation of a percolating cluster, etc. (New educational technologies in
higher education institution: the collection of reports of the tenth
international scientific and methodical conference. Yekaterinburg, UGTU UPI,
2013).


title:
Plasmon scattering from holes: from single hole scattering to Young's
  experiment

abstract:
  In this article, the scattering of surface plasmon polaritons (SPPs) into
photons at holes is investigated. A local, electrically excited source of SPPs
using a scanning tunnelling microscope (STM) produces an outgoing circular
plasmon wave on a thick (200 nm) gold film on glass containing holes of 250,
500 and 1000 nm diameter. Fourier plane images of the photons from
hole-scattered plasmons show that the larger the hole diameter, the more
directional the scattered radiation. These results are confirmed by a model
where the hole is considered as a distribution of horizontal dipoles whose
relative amplitudes, directions, and phases depend linearly on the local SPP
electric field. An SPP-Young's experiment is also performed, where the
STM-excited SPP-wave is incident on a pair of 1 $\mu$m diameter holes in the
thick gold film. The visibility of the resulting fringes in the Fourier plane
is analyzed to show that the polarization of the electric field is maintained
when SPPs scatter into photons. From this SPP-Young's experiment, an upper
bound of $\approx$ 200 nm for the radius of this STM-excited source of surface
plasmon polaritons is determined.


title:
A Raman study of the temperature and magnetic field dependence of
  electronic and lattice properties in MnSi

abstract:
  The temperature and magnetic field dependence of lattice and carrier
excitations in MnSi is studied in detail using inelastic light scattering. The
pure symmetry components of the electronic response are derived from the
polarization dependent spectra. The $E$ and $T_2$ responses agree by and large
with longitudinal and optical transport data. However, an anomaly is observed
right above the magnetic ordering temperature $T_{\rm C}=29\,{\rm K}$ that is
associated with the fluctuations that drive the transition into the
helimagnetic phase first order. The $T_1$ spectra, reflecting mostly chiral
spin excitations, have a temperature dependence similar to that of the $E$ and
$T_2$ symmetries. The response in the fully symmetric $A$ representation has a
considerably weaker temperature dependence than that in the other symmetries.
All nine Raman active phonon lines can be resolved at low temperature. The
positions and line widths of the strongest four lines in $E$ and $T_2$ symmetry
are analyzed in the temperature range $4<T<310\,{\rm K}$. Above $50\,{\rm K}$,
the temperature dependence is found to be conventional and given by anharmonic
phonon decay and the lattice expansion. Distinct anomalies are observed in the
range of the helimagnetic transition and in the ordered phase. Applying a
magnetic field of $4\,{\rm T}$, well above the critical field, removes all
anomalies and restores a conventional behavior highlighting the relationship
between the anomalies and magnetism. The anomaly directly above $T_{\rm C}$ in
the fluctuation range goes along with an anomaly in the thermal expansion.
While the lattice constant changes continuously and has only a kink at $T_{\rm
C}$, all optical phonons soften abruptly suggesting a direct microscopic
coupling between spin order and optical phonons rather than a reaction to
magnetostriction effects.


title:
The Fly's Eye Camera System -- an instrument design for large \'etendue
  time-domain survey

abstract:
  In this paper we briefly summarize the design concepts of the Fly's Eye
Camera System, a proposed high resolution all-sky monitoring device which
intends to perform high cadence time domain astronomy in multiple optical
passbands while still accomplish a high \'etendue. Fundings have already been
accepted by the Hungarian Academy of Sciences in order to design and build a
Fly's Eye device unit. Beyond the technical details and the actual scientific
goals, this paper also discusses the possibilities and yields of a network
operation involving $\sim10$ sites distributed geographically in a nearly
homogeneous manner. Currently, we expect to finalize the mount assembly -- that
performs the sidereal tracking during the exposures -- until the end of 2012
and to have a working prototype with a reduced number of individual cameras
sometimes in the spring or summer of 2013.


title:
On index-exponent relations over Henselian fields with local residue
  fields

abstract:
  Let $p$ be a prime number and $(K, v)$ a Henselian valued field with a
residue field $\widehat K$. This paper determines the Brauer $p$-dimension of
$K$, in case $p \neq {\rm char}(\widehat K)$ and $\widehat K$ is a
$p$-quasilocal field properly included in its maximal $p$-extension. When
$\widehat K$ is a local field, it describes index-exponent pairs of central
division $K$-algebras of $p$-primary degrees. The same goal is achieved, if
$(K, v)$ is maximally complete, char$(K) = p$ and $\widehat K$ is local.


title: On the definition of a moist-air potential vorticity

abstract:
  A new potential vorticity is derived by using a specific entropy formulation
expressed in terms of a moist-air entropy potential temperature. The new
formulation is compared with Ertel's version and with others based on virtual
and equivalent potential temperatures. The new potential vorticity is subject
to conservative properties ensured by the Second Law applied to the moist-air
material derivatives. It is shown that the upper tropospheric and stratospheric
(dry) structures are nearly the same as those obtained with Ertel's component.
Moreover, new structures are observed in the low troposphere, with negative
values associated with moist frontal regions. The negative values are observed
in the frontal regions where slantwise convection instabilities may take place,
but they are smaller than those observed with the equivalent potential
vorticity. The main purpose of the article is to diagnose the behaviour of the
new potential vorticity from numerical output generated by the ARPEGE NWP
model, with the help of isobaric charts and vertical cross-sections. Two
inversion methods are suggested. The first method could be based on the
invertibility principle verified by the virtual potential vorticity, with a
possibility to control and modify separately potential vorticity components in
the (dry) upper and (moist) lower atmospheric levels. The other method may
consist of an inversion process directly applied to the new moist-air entropy
potential vorticity, because the negative values and the solenoidal term are
smaller than those observed with equivalent potential vorticity, as shown by
numerical evaluations.


title:
Josephson oscillations and self-trapping of superfluid fermions in a
  double-well potential

abstract:
  We investigate the behaviour of a two-component Fermi superfluid in a
double-well potential. We numerically solve the time dependent Bogoliubov-de
Gennes equations and characterize the regimes of Josephson oscillations and
self-trapping for different potential barriers and initial conditions. In the
weak link limit the results agree with a two-mode model where the relative
population and the phase difference between the two wells obey coupled
nonlinear Josephson equations. A more complex dynamics is predicted for large
amplitude oscillations and large tunneling.


title: New Approaches with Chord in Efficient P2P Grid Resource Discovery

abstract:
  Grid computing is a type of distributed computing which allows sharing of
computer resources through Internet. It not only allows us to share files but
also most of the software and hardware resources. An efficient resource
discovery mechanism is the fundamental requirements for grid computing systems,
as it supports resource management and scheduling of applications. Among
various discovery mechanisms,Peer-to-Peer (P2P) technology witnessed rapid
development and the key component for this success is efficient lookup
applications of P2P. Chord is a P2P structural model widely used as a routing
protocol to find resources in grid environment. Plenty of ideas are implemented
by researchers to improve the lookup performance of chord protocol in Grid
environment. In this paper, we discuss the recent researches made on Chord
Structured P2P protocol and present our proposed methods in which we use the
address of Recently Visited Node (RVN) and fuzzy technique to easily locate the
grid resources by reducing message complexity and time complexity.


title: Gems first science results

abstract:
  After 101 nights of commissioning, the Gemini MCAO system (GeMS) started
science operations in December 2012. After a brief reminder on GeMS
specificities, we describe the overall GeMS performance, and we focus then on
the first science results obtained with GeMS, illustrating the unique
capabilities of this new Gemini instrument.


title: Operads, quasiorders, and regular languages

abstract:
  We generalize the construction of multitildes in the aim to provide
multitilde operators for regular languages. We show that the underliying
algebraic structure involves the action of some operads. An operad is an
algebraic structure that mimics the composition of the functions. The involved
operads are described in terms of combinatorial objects. These operads are
obtained from more primitive objects, namely precompositions, whose algebraic
counter-parts are investigated. One of these operads acts faithfully on
languages in the sense that two different operators act in two different ways.


title: A logic for reasoning about ambiguity

abstract:
  Standard models of multi-agent modal logic do not capture the fact that
information is often \emph{ambiguous}, and may be interpreted in different ways
by different agents. We propose a framework that can model this, and consider
different semantics that capture different assumptions about the agents'
beliefs regarding whether or not there is ambiguity. We examine the expressive
power of logics of ambiguity compared to logics that cannot model ambiguity,
with respect to the different semantics that we propose.


title:
Reply to the Comment on "General Non-Markovian Dynamics of Open Quantum
  System"

abstract:
  This is the reply to the 2nd version of the comment, [arXiv.1312.5286v2], by
McCutcheon {\it et al.} on our paper [PRL 109, 170402 (2012)]. Our letter
presents three examples. For the steady-state solution of the first example,
i.e., the dissipationless part of Eq.(12) in the PRL, the 2nd version of the
Comment claimed that "this [dissipationless] regime exists if and only if the
total Hamiltonian is unbounded from below, casting serious doubts on the
usefulness of this result." In this reply, we show again that the 2nd version
of the Comment is also incorrect.


title: Analysis and simulations of multifrequency induction hardening

abstract:
  We study a model for induction hardening of steel. The related differential
system consists of a time domain vector potential formulation of the Maxwell's
equations coupled with an internal energy balance and an ODE for the volume
fraction of {\sl austenite}, the high temperature phase in steel. We first
solve the initial boundary value problem associated by means of a Schauder
fixed point argument coupled with suitable a-priori estimates and regularity
results. Moreover, we prove a stability estimate entailing, in particular,
uniqueness of solutions for our Cauchy problem. We conclude with some finite
element simulations for the coupled system.


title: Singular rationally connected threefolds with non-zero pluri-forms

abstract:
  This paper is concerned with singular projective rationally connected
threefolds $X$ which carry non-zero pluri-forms, \textit{i.e.}
$H^0(X,(\Omega_X^1)^{[\otimes m]}) \neq \{0\}$ for some $m > 0$, where
$(\Omega_X^1)^{[\otimes m]}$ is the reflexive hull of $(\Omega_X^1)^{\otimes
m}$. If $X$ has $\mathbb{Q}$-factorial terminal singularities, then we show
that there is a fibration $p$ from $X$ to $\mathbb{P}^1$. Moreover, there is a
natural isomorphism from $H^0(X, (\Omega_X^1)^{[\otimes m]})$ to
$H^0(\mathbb{P}^1, \mathscr{O}_{\mathbb{P}^1}(-2m+\sum_{z\in \mathbb{P}^1}
[\frac{(m(p,z)-1)m}{m(p,z)}]))$ for all $m>0$, where $m(p,z)$ is the smallest
positive coefficient in the divisor $p^*z$.


title: Branching of Automorphic Fundamental Solutions

abstract:
  Automorphic fundamental solutions and, more generally, solutions of
automorphic differential equations, play a key role in the
Diaconu-Garrett-Goldfeld prescription for spectral identities involving moments
of L-functions as well as other applications, including an explicit formula
relating the number of lattice points in a symmetric space to the automorphic
spectrum. In this paper we discuss two cases in which the automorphic
fundamental solution exhibits branching: pathwise meromorphic continuations may
differ by a term involving an Eisenstein series.


title:
VCF2Networks: applying Genotype Networks to Single Nucleotide Variants
  data

abstract:
  Summary: Genotype networks are a method used in systems biology to study the
innovability of a given phenotype, determining whether the phenotype is robust
to mutations, and how do the genotypes associated to it are distributed in the
genotype space. Here we developed VCF2Networks, a tool to apply this method to
population genetics data, and in particular to single Nucleotide Variants data
encoded in the Variant Call file Format (VCF). A complete summary of the
properties of the genotype network that can be calculated by VCF2Networks is
given in the Supplementary Materials 1.
  Availability and Implementation: The home page of the project is
https://bitbucket.org/dalloliogm/vcf2networks . VCF2Networks is also available
directly from the Python Package Index (PyPI), under the name vcf2networks.


title: Moufang sets of finite Morley rank of odd type

abstract:
  We show that for a wide class of groups of finite Morley rank the presence of
a split $BN$-pair of Tits rank $1$ forces the group to be of the form
$\operatorname{PSL}_2$ and the $BN$-pair to be standard. Our approach is via
the theory of Moufang sets. Specifically, we investigate infinite and so-called
hereditarily proper Moufang sets of finite Morley rank in the case where the
little projective group has no infinite elementary abelian $2$-subgroups and
show that all such Moufang sets are standard (and thus associated to
$\operatorname{PSL}_2(F)$ for $F$ an algebraically closed field of
characteristic not $2$) provided the Hua subgroups are nilpotent. Further, we
prove that the same conclusion can be reached whenever the Hua subgroups are
$L$-groups and the root groups are not simple.


title: On the Real-time Prediction Problems of Bursting Hashtags in Twitter

abstract:
  Hundreds of thousands of hashtags are generated every day on Twitter. Only a
few become bursting topics. Among the few, only some can be predicted in
real-time. In this paper, we take the initiative to conduct a systematic study
of a series of challenging real-time prediction problems of bursting hashtags.
Which hashtags will become bursting? If they do, when will the burst happen?
How long will they remain active? And how soon will they fade away? Based on
empirical analysis of real data from Twitter, we provide insightful statistics
to answer these questions, which span over the entire lifecycles of hashtags.


title: A universal hypercyclic representation

abstract:
  For any countable group, and also for any locally compact second countable,
compactly generated topological group, G, we show the existence of a
"universal" hypercyclic (i.e. topologically transitive) representation on a
Hilbert space, in the sense that it simultaneously models every possible
ergodic probability measure preserving free action of G.


title: An extended standard model and its Higgs geometry from the matrix model

abstract:
  We find a simple brane configuration in the IKKT matrix model which resembles
the standard model at low energies, with a second Higgs doublet and
right-handed neutrinos. The electroweak sector is realized geometrically in
terms of two minimal fuzzy ellipsoids, which can be interpreted in terms of
four point-branes in the extra dimensions. The electroweak Higgs connects these
branes and is an indispensable part of the geometry. Fermionic would-be zero
modes arise at the intersections with two larger branes, leading precisely to
the correct chiral matter fields at low energy, along with right-handed
neutrinos which can acquire a Majorana mass due to a Higgs singlet. The larger
branes give rise to $SU(3)_c$, extended by $U(1)_B$ and another $U(1)$ which
are anomalous at low energies and expected to disappear. At higher energies,
mirror fermions and additional fields arise, completing the full ${\cal N}=4$
supersymmetry. The brane configuration is a solution of the model, assuming a
suitable effective potential and a non-linear stabilization of the singlet
Higgs. The basic results can be carried over to ${\cal N}=4$ $SU(N)$
super-Yang-Mills on ordinary Minkowski space with sufficiently large $N$.


title:
Comment on "Atomic mass compilation 2012" by B. Pfeiffer, K.
  Venkataramaniah, U. Czok, C. Scheidenberger

abstract:
  This "Comment" submitted to ADNDT on December 13, 2013 concerns a publication
entitled "Atomic Mass Compilation 2012", which appeared in the March 2014 issue
of the journal Atomic Data and Nuclear Data Tables (available online on
September 6, 2013).


title: The completion of optimal $(3,4)$-packings

abstract:
  A 3-$(n,4,1)$ packing design consists of an $n$-element set $X$ and a
collection of $4$-element subsets of $X$, called {\it blocks}, such that every
$3$-element subset of $X$ is contained in at most one block. The packing number
of quadruples $d(3,4,n)$ denotes the number of blocks in a maximum
$3$-$(n,4,1)$ packing design, which is also the maximum number $A(n,4,4)$ of
codewords in a code of length $n$, constant weight $4$, and minimum Hamming
distance 4. In this paper the undecided 21 packing numbers $A(n,4,4)$ are shown
to be equal to Johnson bound $J(n,4,4)$ $(
=\lfloor\frac{n}{4}\lfloor\frac{n-1}{3}\lfloor\frac{n-2}{2}\rfloor\rfloor\rfloor)$
where $n=6k+5$,
  $k\in \{m:\ m$ is odd, $3\leq m\leq 35,\ m\neq 17,21\}\cup
\{45,47,75,77,79,159\}$.


title:
Polarization Switching Ability Dependent on Multidomain Topology in a
  Uniaxial Organic Ferroelectric

abstract:
  The switching of electric polarization induced by electric fields -a
fundamental functionality of ferroelectrics- is closely associated with the
motions of the domain walls that separate regions with distinct polarization
directions. Therefore, understanding domain-walls dynamics is of essential
importance for advancing ferroelectric applications. In this Letter, we show
that the topology of the multidomain structure can have an intrinsic impact on
the degree of switchable polarization. Using a combination of polarization
hysteresis measurements and piezoresponse force microscopy on a uniaxial
organic ferroelectric, alpha-6,6'-dimethyl-2,2'-bipyridinium chloranilate, we
found that the head-to-head (or tail-to-tail) charged domain walls are strongly
pinned and thus impede the switching process; in contrast, if the charged
domain walls are replaced with electrically neutral antiparallel domain walls,
bulk polarization switching is achieved. Our findings suggest that manipulation
of the multidomain topology can potentially control the switchable
polarization.


title:
Universal aspects of the random first order phase transition theory of
  the structural glass transition

abstract:
  We analyze the ways in which the random first order phase transition (RFOT)
of the glass transition differs from the well-studied regular first order and
second order (or continuous) phase transitions. Just as is the case in the
latter two classes of phase transitions, the RFOT also exhibits universal
features. Here, we discuss these features and compare and contrast the RFOT
with other types of transitions with an emphasis on the structural glass
transition problem. An important feature of the complete RFOT theory is that it
has at least two distinct transition temperatures, one of which is a dynamical
(avoided) transition signaling loss of effective ergodicity, and the other is
an equilibrium ideal glass transition. Particular attention is paid to the
coherence, or correlation, length associated with these transitions in the
RFOT. We also derive universal scaling relations for several experimentally
measurable quantities that are valid near the ideal glass transition. In
particular, activated scaling ideas are used to obtain a scaling equation for
the non-linear structural glass susceptibility as the ideal glass transition is
approached. Important finite corrections to the ideal glass transition
temperature are also discussed. Our work provides additional criteria for
assessing the validity of RFOT theory of the liquid to glass transition, and
provides a firm theoretical foundation for analyzing experimental data on the
temperature dependence of the relaxation times.


title:
Drag correlation for dilute and moderately dense fluid-particle systems
  using the lattice Boltzmann method

abstract:
  This paper presents a numerical study of flow through static random
assemblies of monodisperse, spherical particles. A lattice Boltzmann approach
based on a two relaxation time collision operator is used to obtain reliable
predictions of the particle drag by direct numerical simulation. From these
predictions a closure law $F(Re, {\varphi})$ of the drag force relationship to
the bed density ${\varphi}$ and the particle Reynolds number $Re$ is derived.
The present study includes densities ${\varphi}$ ranging from $0.01$ to $0.35$
with Re ranging up to $300$, that is compiled into a single drag correlation
valid for the whole range. The corelation has a more compact expression
compared to others previously reported in literature. At low particle
densities, the new correlation is close to the widely used Wen & Yu -
correlation. Recently, there has been reported a discrepancy between results
obtained using different numerical methods, namely the comprehensive lattice
Boltzmann study of Beetstra et al. (2007) and the predictions based on an
immersed boundary - pseudo-spectral Navier-Stokes approach (Tenneti et al.,
2011). The present study excludes significant finite resolution effects, which
have been suspected to cause the reported deviations, but does not coincide
exactly with either of the previous studies. This indicates the need for yet
more accurate simulation methods in the future.


title: Quantum fields in curved spacetime

abstract:
  We review the theory of quantum fields propagating in an arbitrary,
classical, globally hyperbolic spacetime. Our review emphasizes the conceptual
issues arising in the formulation of the theory and presents known results in a
mathematically precise way. Particular attention is paid to the distributional
nature of quantum fields, to their local and covariant character, and to
microlocal spectrum conditions satisfied by physically reasonable states. We
review the Unruh and Hawking effects for free fields, as well as the behavior
of free fields in deSitter spacetime and FLRW spacetimes with an exponential
phase of expansion. We review how nonlinear observables of a free field, such
as the stress-energy tensor, are defined, as well as time-ordered-products. The
"renormalization ambiguities" involved in the definition of time-ordered
products are fully characterized. Interacting fields are then perturbatively
constructed. Our main focus is on the theory of a scalar field, but a brief
discussion of gauge fields is included. We conclude with a brief discussion of
a possible approach towards a nonperturbative formulation of quantum field
theory in curved spacetime and some remarks on the formulation of quantum
gravity.