title:
The Darkest Shadows: Deep Mid-Infrared Extinction Mapping of a Massive
  Protocluster

abstract:
  We use deep $8\:\mu m$ Spitzer-IRAC imaging of a massive Infrared Dark Cloud
(IRDC) G028.37+00.07 to construct a Mid-Infrared (MIR) extinction map that
probes mass surface densities up to $\Sigma\:\sim 1\:\rm{g~cm^{-2}}$
($A_V\sim200\:$mag), amongst the highest values yet probed by extinction
mapping. Merging with a NIR extinction map of the region, creates a high
dynamic range map that reveals structures down to $A_V\sim1\:$mag. We utilize
the map to: (1) Measure a cloud mass $\sim7\times10^4\:M_\odot$ within a radius
of $\sim8\:$pc. $^{13}$CO kinematics indicate that the cloud is gravitationally
bound. It thus has the potential to form one of the most massive young star
clusters known in the Galaxy. (2) Characterize the structures of 16 massive
cores within the IRDC, finding they can be fit by singular polytropic spheres
with $\rho\propto{r}^{-k_\rho}$ and $k_\rho=1.3\pm0.3$. They have
$\overline{\Sigma}\simeq0.1-0.4\:\rm{g~cm^{-2}}$ --- relatively low values
that, along with their measured cold temperatures, suggest magnetic fields,
rather than accretion-powered radiative heating, are important for controlling
fragmentation of these cores. (3) Determine the $\Sigma$ (equivalently column
density or $A_V$) probability distribution function (PDF) for a region that is
near complete for $A_V>3\:$mag. The PDF is well fit by a single log-normal with
mean $\overline{A}_V\simeq9\:$mag, high compared to other known clouds. It does
not exhibit a separate high-end power law tail, which has been claimed to
indicate the importance of self-gravity. However, we suggest that the PDF does
result from a self-similar, self-gravitating hierarchy of structure being
present over a wide range of scales in the cloud.


title: Direct determination of external radiation dose in human blood

abstract:
  In this study it was shown that it is possible to determine radiation doses
from external beam therapy both directly and retrospectively from a human blood
sample. To the best of our knowledge no other studies exist on the direct
measurement of doses received by a person from external beam therapy. Optically
stimulated luminescence counts from a healthy blood sample exposed to an
external radiation source were measured. Blood aliquots were given 0, 1, 2, 3,
4, 5, 10, 15, 20, 25, 50, 100 and 200Gy beta doses and their decay and
dose-response curves were plotted. While the luminescence intensities were
found to be relatively low for the doses smaller than 10Gy, they were measured
considerably higher for doses greater than 10Gy. The dose received by the blood
aliquots was determined by interpolating the luminescence counts of 10Gy to the
dose-response curve. This study has important ramifications for healthcare,
medicine and radiation protection


title: Split Fermi seas in one-dimensional Bose fluids

abstract:
  For the one-dimensional repulsive Bose gas (Lieb-Liniger model), we study a
special class of highly-excited states obtained by giving a finite momentum to
subgroups of particles. These states, which correspond to `splitting' the
ground state Fermi sea-like quantum number configuration, are zero-entropy
states which display interesting properties more normally associated to ground
states. Using a numerically exact method based on integrability, we study these
states' excitation spectrum, density correlations and momentum distribution
functions. These correlations display power-law asymptotics, and are shown to
be accurately described by an effective multicomponent Tomonaga-Luttinger
liquid theory whose parameters are obtained from Bethe Ansatz. The
non-universal correlation prefactors are moreover obtained from integrability,
yielding a completely parameter-free fit of the correlator asymptotics.


title:
Heavy-flavour decay lepton measurements in pp, p-Pb, and Pb-Pb
  collisions with ALICE at the LHC

abstract:
  We present the measurements of electrons and muons from the semi-leptonic
decays of heavy-flavour hadrons measured in the central and forward rapidity
regions with ALICE in pp, Pb-Pb, and p-Pb, collisions at the LHC. The
pT-differential production cross section in pp collisions, the elliptic flow in
Pb-Pb collisions, and the nuclear modification factor in Pb-Pb and p-Pb
collisions are shown. The results are compared to theoretical predictions.


title: Secret key rates for an encoded quantum repeater

abstract:
  We investigate secret key rates for the quantum repeater using encoding [L.
Jiang et al., Phys. Rev. A 79, 032325 (2009)] and compare them to the standard
repeater scheme by Briegel, D\"ur, Cirac, and Zoller. The former scheme has the
advantage of a minimal consumption of classical communication. We analyze the
trade-off in the secret key rate between the communication time and the
required resources. For this purpose, we introduce an error model for the
repeater using encoding which allows for input Bell states with a fidelity
smaller than one, in contrast to the model given in [L. Jiang et al., Phys.
Rev. A 79, 032325 (2009)]. We show that one can correct additional errors in
the encoded connection procedure of this repeater and develop a suitable
decoding algorithm. Furthermore, we derive the rate of producing entangled
pairs for the quantum repeater using encoding and give the minimal parameters
(gate quality and initial fidelity) for establishing a nonzero secret key. We
find that the generic quantum repeater is optimal regarding the secret key rate
per memory per second and show that the encoded quantum repeater using the
simple three-qubit repetition code can even have an advantage with respect to
the resources compared to other recent quantum repeater schemes with encoding.


title: Phragm\'en-Lindel\"of theorem for infinity harmonic functions

abstract:
  We investigate a version of the Phragm\'en-Lindel\"of theorem for solutions
of the equation $\Delta_\infty u=0$ in unbounded convex domains. The method of
proof is to consider this infinity harmonic equation as the limit of the
$p$-harmonic equation when $p$ tends to $\infty$.


title:
Cumulative luminosity distributions of Supergiant Fast X-ray Transients
  in hard X-rays

abstract:
  We have analyzed in a systematic way about nine years of INTEGRAL data
(17-100 keV) focusing on Supergiant Fast X-ray Transients (SFXTs) and three
classical High Mass X-ray Binaries (HMXBs). Our approach has been twofold:
image based analysis, sampled over a ~ks time frame to investigate the
long-term properties of the sources, and lightcurve based analysis, sampled
over a 100s time frame to seize the fast variability of each source during its
~ks activity. We find that while the prototypical SFXTs (IGR J17544-2619, XTE
J1739-302 and SAX J1818.6-1703) are among the sources with the lowest ~ks based
duty cycle ($<$1% activity over nine years of data), when studied at the 100s
level, they are the ones with the highest detection percentage, meaning that,
when active, they tend to have many bright short-term flares with respect to
the other SFXTs. To investigate in a coherent and self consistent way all the
available results within a physical scenario, we have extracted cumulative
luminosity distributions for all the sources of the sample. The
characterization of such distributions in hard X-rays, presented for the first
time in this work for the SFXTs, shows that a power-law model is a plausible
representation for SFXTs, while it can only reproduce the very high luminosity
tail of the classical HMXBs, and even then, with a significantly steeper
power-law slope with respect to SFXTs. The physical implications of these
results within the frame of accretion in wind-fed systems are discussed.


title: Black hole stability in Jordan and Einstein frames

abstract:
  We investigate the classical stability of Schwarzschild black hole in Jordan
and Einstein frames which are related by the conformal transformations. For
this purpose, we introduce two models of the Brans-Dicke theory and
Brans-Dicke-Weyl gravity in Jordan frame and two corresponding models in the
Einstein frame. The former model is suitable for studying the massless spin-2
graviton propagating around the Schwarzschild black hole, while the later is
designed for the massive spin-2 graviton propagating around the black hole. It
turns out that the black hole (in)stability is independent of the frame which
shows that the two frames are equivalent to each other.


title:
Some Calder\'on-Zygmund kernels and their relations to Wolff capacities
  and rectifiability

abstract:
  We consider the Calder\'on-Zygmund kernels $K_
{\alpha,n}(x)=(x_i^{2n-1}/|x|^{2n-1+\alpha})_{i=1}^d$ in $\mathbb{R}^n$ for
$0<\alpha\leq 1$ and $n\in\mathbb{N}$. We show that, on the plane, for
$0<\alpha<1$, the capacity associated to the kernels $K_{\alpha,n}$ is
comparable to the Riesz capacity $C_{\frac23(2-\alpha),\frac 3 2}$ of
non-linear potential theory. As consequences we deduce the semiadditivity and
bi-Lipschitz invariance of this capacity. Furthermore we show that for any
Borel set $E\subset\mathbb{R}^n$ with finite length the $L^2(\mathcal{H}^1
\lfloor E)$-boundedness of the singular integral associated to $K_{1,n}$
implies the rectifiability of the set $E$. We thus extend to any ambient
dimension, results previously known only in the plane.


title:
Measurements and modelling of fast-ion redistribution due to MHD
  instabilities in the Mega-Amp Spherical Tokamak

abstract:
  The results of a comprehensive investigation into the effects of various MHD
modes on the NBI-generated fast-ion population in MAST plasmas are reported.
Fast-ion redistribution due to low-frequency (20-50 kHz) chirping energetic
particle modes known as fishbones, as well as the long-lived internal kink
mode, is observed with the Fast-Ion Deuterium Alpha (FIDA) spectrometer and
radially-scanning collimated neutron camera. In addition, strongly-driven
chirping toroidicity-induced Alfven eigenmodes are observed to cause fast-ion
redistribution, as are sawteeth and large edge-localised modes. In each case,
the modes affect fast ions in a region of real space governed by the eigenmode
structure and principal toroidal mode number. Modelling using the global
transport analysis code TRANSP, with ad hoc anomalous diffusion introduced,
reproduces the coarsest features of the affected fast-ion distribution in the
presence of energetic-particle-driven modes, but the spectrally and spatially
resolved FIDA measurements suggest that the distribution exhibits structure on
a finer scale than is accounted for by this model.


title:
Dynamical pattern formations in two dimensional fluid and Landau pole
  bifurcation

abstract:
  A phenomenological theory is proposed to analyze the asymptotic dynamics of
perturbed inviscid Kolmogorov shear flows in two dimensions. The phase diagram
provided by the theory is in qualitative agreement with numerical observations,
which include three phases depending on the aspect ratio of the domain and the
size of the perturbation: a steady shear flow, a stationary dipole, and four
traveling vortices. The theory is based on a precise study of the inviscid
damping of the linearized equation and on an analysis of nonlinear effects. In
particular, we show that the dominant Landau pole controlling the inviscid
damping undergoes a bifurcation, which has important consequences on the
asymptotic fate of the perturbation.


title:
Unconventional ordering behavior of semi-flexible polymers in dense
  brushes under compression

abstract:
  Using a coarse-grained bead-spring model for semi-flexible macromolecules
forming a polymer brush, structure and dynamics of the polymers is
investigated, varying chain stiffness and grafting density. The anchoring
condition for the grafted chains is chosen such that their first bonds are
oriented along the normal to the substrate plane.
  Compression of such a semi-flexible brush by a planar piston is observed to
be a two-stage process: for small compressions the chains contract by
"buckling" deformation whereas for larger compression the chains exhibit a
collective (almost uniform) bending deformation. Thus, the stiff polymer brush
undergoes a 2-nd order phase transition of collective bond reorientation. The
pressure, required to keep the stiff brush at a given degree of compression, is
thereby significantly smaller than for an otherwise identical brush made of
entirely flexible polymer chains! While both the brush height and the chain
linear dimension in the z-direction perpendicular to the substrate increase
monotonically with increasing chain stiffness, lateral (xy) chain linear
dimensions exhibit a maximum at intermediate chain stiffness. Increasing the
grafting density leads to a strong decrease of these lateral dimensions,
compatible with an exponential decay. Also the recovery kinetics after removal
of the compressing piston is studied, and found to follow a power-law /
exponential decay with time.
  A simple mean-field theoretical consideration, accounting for the
buckling/bending behavior of semi-flexible polymer brushes under compression,
is suggested.


title:
Corrections to the Berry phase in a solid-state qubit due to
  low-frequency noise

abstract:
  We present a quantum open-system approach to analyze the nonunitary dynamics
of a superconducting qubit when it evolves under the influence of external
noise. We consider the presence of longitudinal and transverse environmental
fluctuations affecting the system's dynamics and model these fluctuations by
defining their correlation function in time. By using a Gaussian-like noise
correlation, we can study low- and high-frequency noise contribution to
decoherence and implement our results in the computation of geometric phases in
open quantum systems. We numerically study when the accumulated phase of a
solid-state qubit can still be found close to the unitary (Berry) one. Our
results can be used to explain experimental measurements of the Berry phase
under high-frequency fluctuations and design experimental future setups when
manipulating superconducting qubits.


title:
Inverse source problems for time-fractional mixed parabolic-hyperbolic
  type equations

abstract:
  In the present paper we consider an inverse source problem for
time-fractional mixed parabolic-hyperbolic equation with the Caputo derivative.
In case, when hyperbolic part of the considered mixed type equation is wave
equation, the uniqueness of source and solution are strongly influenced by
initial time and generally is ill-posed. However, when the hyperbolic part is
time fractional, the problem is well posed if end time is large. Our method
relies on the orthonormal system of eigenfunctions of the operator with respect
to space variable. We proved the uniqueness and stability of certain weak
solutions for considered problems.


title: Abstract convex optimal antiderivatives

abstract:
  Having studied families of antiderivatives and their envelopes in the setting
of classical convex analysis, we now extend and apply these notions and results
in settings of abstract convex analysis. Given partial data regarding a
c-subdifferential, we consider the set of all c-convex c-antiderivatives that
comply with the given data. Under a certain assumption, this set is not empty
and contains both its lower and upper envelopes. We represent these optimal
antiderivatives by explicit formulae. Some well known functions are, in fact,
optimal c-convex c-antiderivatives. In one application, we point out a natural
minimality property of the Fitzpatrick function of a c-monotone mapping, namely
that it is a minimal antiderivative. In another application, in metric spaces,
a constrained Lipschitz extension problem fits naturally the convexity notions
we discuss here. It turns out that the optimal Lipschitz extensions are
precisely the optimal antiderivatives. This approach yields explicit formulae
for these extensions, the most particular case of which recovers the well known
extensions due to McShane and Whitney.


title: Light vector-like fermions in a minimal SU(5) setup

abstract:
  The Standard Model fermion sector is enlarged by either one light singlet
vector-like down-type quark or one light vector-like lepton doublet, which
might be accommodated within a five-dimensional representation of SU(5). At low
energies the inclusion of these states affects precisely measured observables
in flavor physics, as well as electroweak precision measurements. These
experimental results strongly constrain couplings of vector-like states to the
Standard Model particles. Having these bounds, we investigate the impact of
vector-like fermions on the mass matrices for down-type quarks and charged
leptons in an SU(5) setting. We find that unitary transformations relating an
arbitrary flavor basis to the mass eigenstate basis depend only on three free
parameters. Then we discuss the parameter space constrained by low-energy data
assuming vector-like quark and vector-like lepton masses to be 800 GeV and 400
GeV, respectively. We demonstrate that these two scenarios generate unique
patterns for relevant proton decay widths. A further improvement of
experimental bounds on proton decay modes would thus differentiate the allowed
parameter space. We finally present two full-fledged SU(5) models that allow
for gauge coupling unification with light vector-like fermions under
consideration and discuss their viability.


title:
Stability analysis of black holes in massive gravity: a unified
  treatment

abstract:
  We consider the analytic solutions of massive (bi)gravity which can be
written in a simple form using advanced Eddington-Finkelstein coordinates. We
analyse the stability of these solutions against radial perturbations. First we
recover the previously obtained result on the instability of the bidiagonal
bi-Schwarzschild solutions. In the non-bidiagonal case (which contains, in
particular, the Schwarzschild solution with Minkowski fiducial metric) we show
that generically there are physical spherically symmetric perturbations, but no
unstable modes.


title:
Scaling Properties of light (anti)nuclei and (anti)hypertriton
  production in Au+Au collisions at $\sqrt{s_{\rm{NN}}} = 200$ GeV

abstract:
  We present the scaling properties of mass number of light (anti)nuclei
production in midrapidity Au + Au collisions at $\sqrt {s_{NN}}=200$ GeV based
on the PACIAE + DCPC model. It is found that the integrated yield of light
(anti)nuclei decreased exponentially with the increase of mass numbers which
depends on the centrality, this properties of the system can be described
quantitatively by temperature $T$ at hadronic freeze-out, and the model results
are consistent with STAR data. Furthermore, we found that the integrated yield
of heavier (anti)nuclei per participant nucleon increases from peripheral to
central collisions more rapidly than that of $d(\bar{d})$, indicating that the
mass scale of light (anti)nuclei production was presented in relativistic heavy
ion collisions.


title: Canonical Models for holomorphic iteration

abstract:
  We construct canonical intertwining semi-models with Kobayashi hyperbolic
base space for holomorphic self-maps of complex manifolds which are univalent
on some absorbing cocompact hyperbolic domain. In particular, in the unit ball
we solve the Valiron equation for hyperbolic univalent self-maps and for
hyperbolic semigroups.


title: Three-electron spin states and entanglement states

abstract:
  In this paper, we have given the symmetrical and antisymmetrical spin and
space wave functions of three-electron, and further given the full total
entanglement states for the three-electron, which are related to their space
and spin wave function. When we study particles entanglement we not only
consider their spin entanglement and also consider their space entanglement.
Otherwise, we find that electrons entanglement are restricted to the teeny
range, when electrons exceed the space range, their entanglement should be
broken down even disappearance, which is accordance with the experiments
results.


title: Context-based Word Acquisition for Situated Dialogue in a Virtual World

abstract:
  To tackle the vocabulary problem in conversational systems, previous work has
applied unsupervised learning approaches on co-occurring speech and eye gaze
during interaction to automatically acquire new words. Although these
approaches have shown promise, several issues related to human language
behavior and human-machine conversation have not been addressed. First,
psycholinguistic studies have shown certain temporal regularities between human
eye movement and language production. While these regularities can potentially
guide the acquisition process, they have not been incorporated in the previous
unsupervised approaches. Second, conversational systems generally have an
existing knowledge base about the domain and vocabulary. While the existing
knowledge can potentially help bootstrap and constrain the acquired new words,
it has not been incorporated in the previous models. Third, eye gaze could
serve different functions in human-machine conversation. Some gaze streams may
not be closely coupled with speech stream, and thus are potentially detrimental
to word acquisition. Automated recognition of closely-coupled speech-gaze
streams based on conversation context is important. To address these issues, we
developed new approaches that incorporate user language behavior, domain
knowledge, and conversation context in word acquisition. We evaluated these
approaches in the context of situated dialogue in a virtual world. Our
experimental results have shown that incorporating the above three types of
contextual information significantly improves word acquisition performance.


title:
Improving Statistical Machine Translation for a Resource-Poor Language
  Using Related Resource-Rich Languages

abstract:
  We propose a novel language-independent approach for improving machine
translation for resource-poor languages by exploiting their similarity to
resource-rich ones. More precisely, we improve the translation from a
resource-poor source language X_1 into a resource-rich language Y given a
bi-text containing a limited number of parallel sentences for X_1-Y and a
larger bi-text for X_2-Y for some resource-rich language X_2 that is closely
related to X_1. This is achieved by taking advantage of the opportunities that
vocabulary overlap and similarities between the languages X_1 and X_2 in
spelling, word order, and syntax offer: (1) we improve the word alignments for
the resource-poor language, (2) we further augment it with additional
translation options, and (3) we take care of potential spelling differences
through appropriate transliteration. The evaluation for Indonesian- >English
using Malay and for Spanish -> English using Portuguese and pretending Spanish
is resource-poor shows an absolute gain of up to 1.35 and 3.37 BLEU points,
respectively, which is an improvement over the best rivaling approaches, while
using much less additional data. Overall, our method cuts the amount of
necessary "real training data by a factor of 2--5.


title:
Internet of Things: Concept, Building blocks, Applications and
  Challenges

abstract:
  Internet of things (IoT) constitutes one of the most important technology
that has the potential to affect deeply our way of life, after mobile phones
and Internet. The basic idea is that every objet that is around us will be part
of the network (Internet), interacting to reach a common goal. In another word,
the Internet of Things concept aims to link the physical world to the digital
one. Technology advances along with popular demand will foster the wide spread
deployement of IoT's services, it would radically transform our corporations,
communities, and personal spheres. In this survey, we aim to provide the reader
with a broad overview of the Internet of things concept, its building blocks,
its applications along with its challenges.


title:
Use of THz Photoconductive Sources to Characterize Tunable Graphene RF
  Plasmonic Antennas

abstract:
  Graphene, owing to its ability to support plasmon polariton waves in the
terahertz frequency range, enables the miniaturization of antennas to allow
wireless communications among nanosystems. One of the main challenges in the
demonstration of graphene antennas is finding suitable terahertz sources to
feed the antenna. This paper estimates the performance of a graphene RF
plasmonic micro-antenna fed with a photoconductive source. The terahertz source
is modeled and, by means of a full-wave EM solver, the radiated power of the
device is estimated with respect to material, laser illumination and antenna
geometry parameters. The results show that the proposed device radiates
terahertz pulses with an average power up to 1$\mu$W, proving the feasibility
of feeding miniaturized graphene antennas with photoconductive materials.


title:
Constraints on the parameters of axion from measurements of thermal
  Casimir-Polder force

abstract:
  Stronger constraints on the pseudoscalar coupling constants of an axion and
axion-like particles with a proton and a neutron are obtained from measurements
of the thermal Casimir-Polder force between a Bose-Einstein condensate of
$^{87}$Rb atoms and a SiO$_2$ plate. For this purpose the additional force
acting between a condensate cloud and a plate due to two-axion exchange is
calculated. The obtained constraints refer to the axion masses from 0.1meV to
0.3eV which overlap with the region from 0.01meV to 10meV considered at the
moment as the most prospective.


title: Quasi-relativistic calculus of graphene monolayer minimal conductivity

abstract:
  We introduce a quasi-relativistic theory of quantum transport in graphene
monolayer. It is based on the Dirac -- Hartry -- Fock self-consistent field
approximation, assumption on lattice anti-ferromagnetic ordering and an
approach [Falkovsky and Varlamov, Eur.~Phys.~J. {\bf B 56}, 281(2007)]. Minimal
conductivity of graphene is shown to be $4.83$ (in units of $e^2/h$) when
accounting for non-relativistic current only. Allowing for quasi-relativistic
corrections to current due to process of pairs production and magneto-electric
effects we obtain the results for the minimal conductivity which are in a very
good agreement with experimental data for different supports.


title: Diagnostic systems in DEMO: engineering design issues

abstract:
  The diagnostic systems of DEMO that are mounted on or near the torus, whether
intended for the monitoring and control functions of the engineering aspects or
the physics behaviour of the machine, will have to be designed to suit the
hostile nuclear environment. This will be necessary not just for their survival
and correct functioning but also to satisfy the pertinent regulatory bodies,
especially where any of them relate to machine protection or the prevention or
mitigation of accidents foreseen in the safety case. This paper aims to
indicate the more important of the reactor design considerations that are
likely to apply to diagnostics for DEMO, drawn from experience on JET, the
provisions in hand for ITER and modelling results for the wall erosion and
neutron damage effects in DEMO.


title:
Bandwidth selection in kernel empirical risk minimization via the
  gradient

abstract:
  In this paper, we deal with the data-driven selection of multidimensional and
possibly anisotropic bandwidths in the general framework of kernel empirical
risk minimization. We propose a universal selection rule, which leads to
optimal adaptive results in a large variety of statistical models such as
nonparametric robust regression and statistical learning with errors in
variables. These results are stated in the context of smooth loss functions,
where the gradient of the risk appears as a good criterion to measure the
performance of our estimators. The selection rule consists of a comparison of
gradient empirical risks. It can be viewed as a nontrivial improvement of the
so-called Goldenshluger-Lepski method to nonlinear estimators. Furthermore, one
main advantage of our selection rule is the nondependency on the Hessian matrix
of the risk, usually involved in standard adaptive procedures.


title:
On the feasibility of employing solar-like oscillators as detectors for
  the stochastic background of gravitational waves

abstract:
  We present a hydrodynamic model that describes excitation of linear stellar
oscillations by a stochastic background of gravitational waves (SBGW) of
astrophysical and cosmological origin. We find that this excitation mechanism
is capable of generating solar g-mode amplitudes close to or comparable with
values expected from excitation by turbulent convection, which is considered to
be the main driving force for solar-like oscillations. A method is presented
that places direct upper bounds on the SBGW in a frequency range, in which the
SBGW is expected to contain rich astrophysical information. Employing estimates
for solar g-mode amplitudes, the proposed method is demonstrated to have the
potential to compete with sensitivities reached by gravitational wave
experiments in other frequency ranges.


title: Deterministic Hadamard gate for microwave "cat-state" qubits in cQED

abstract:
  We propose the implementation of a deterministic Hadamard gate for logical
photonic qubits encoded in superpositions of coherent states of a harmonic
oscillator. The proposed scheme builds on a recently introduced set of
conditional operations in the strong dispersive regime of circuit QED [Z.
Leghtas et al. Phys. Rev. A. {\bf 87} (2013)]. We further propose an
architecture for coupling two such logical qubits and provide a universal set
of deterministic quantum gates. Based on parameter values taken from the
current state of the art, we give estimates for the achievable gate fidelities
accounting for fundamental gate imperfections and finite coherence time due to
photon loss.


title:
Stark shift and field ionization of arsenic donors in $^{28}$Si-SOI
  structures

abstract:
  We develop an efficient back gate for silicon-on-insulator (SOI) devices
operating at cryogenic temperatures, and measure the quadratic hyperfine Stark
shift parameter of arsenic donors in isotopically purified $^{28}$Si-SOI layers
using such structures. The back gate is implemented using MeV ion implantation
through the SOI layer forming a metallic electrode in the handle wafer,
enabling large and uniform electric fields up to $\sim$ 2 V/$\mu$m to be
applied across the SOI layer. Utilizing this structure we measure the Stark
shift parameters of arsenic donors embedded in the $^{28}$Si SOI layer and find
a contact hyperfine Stark parameter of $\eta_a=-1.9\pm0.2\times10^{-3}
\mu$m$^2$/V$^2$. We also demonstrate electric-field driven dopant ionization in
the SOI device layer, measured by electron spin resonance.


title:
Two approaches for describing the Casimir interaction with graphene:
  density-density correlation function versus polarization tensor

abstract:
  The comparison studies of theoretical approaches to the description of the
Casimir interaction in layered systems including graphene is performed. It is
shown that at zero temperature the approach using the polarization tensor leads
to the same results as the approach using the longitudinal density-density
correlation function of graphene. An explicit expression for the
zero-temperature transverse density-density correlation function of graphene is
provided. We further show that the computational results for the Casimir free
energy of graphene-graphene and graphene-Au plate interactions at room
temperature, obtained using the temperature-dependent polarization tensor,
deviate significantly from those using the longitudinal density-density
correlation function defined at zero temperature. We derive both the
longitudinal and transverse density-density correlation functions of graphene
at nonzero temperature. The Casimir free energy in layered structures including
graphene, computed using the temperature-dependent correlation functions, is
exactly equal to that found using the polarization tensor.


title: OLAP on Structurally Significant Data in Graphs

abstract:
  Summarized data analysis of graphs using OLAP (Online Analytical Processing)
is very popular these days. However due to high dimensionality and large size,
it is not easy to decide which data should be aggregated for OLAP analysis.
Though iceberg cubing is useful, but it is unaware of the significance of
dimensional values with respect to the structure of the graph. In this paper,
we propose a Structural Significance, SS, measure to identify the structurally
significant dimensional values in each dimension. This leads to structure aware
pruning. We then propose an algorithm, iGraphCubing, to compute the graph cube
to analyze the structurally significant data using the proposed measure. We
evaluated the proposed ideas on real and synthetic data sets and observed very
encouraging results.


title:
An upper bound from helioseismology on the stochastic background of
  gravitational waves

abstract:
  The universe is expected to be permeated by a stochastic background of
gravitational radiation of astrophysical and cosmological origin. This
background is capable of exciting oscillations in solar-like stars. Here we
show that solar-like oscillators can be employed as giant hydrodynamical
detectors for such a background in the muHz to mHz frequency range, which has
remained essentially unexplored until today. We demonstrate this approach by
using high-precision radial velocity data for the Sun to constrain the
normalized energy density of the stochastic gravitational-wave background
around 0.11 mHz. These results open up the possibility for asteroseismic
missions like CoRoT and Kepler to probe fundamental physics.


title:
Demonstration of Geometric Landau-Zener Interferometry in a
  Superconducting Qubit

abstract:
  Geometric quantum manipulation and Landau-Zener interferometry have been
separately explored in many quantum systems. In this Letter, we combine these
two approaches to study the dynamics of a superconducting phase qubit. We
experimentally demonstrate Landau-Zener interferometry based on the pure
geometric phases in this solid-state qubit. We observe the interference caused
by a pure geometric phase accumulated in the evolution between two consecutive
Landau-Zener transitions, while the dynamical phase is canceled out by a
spin-echo pulse. The full controllability of the qubit state as a function of
the intrinsically robust geometric phase provides a promising approach for
quantum state manipulation.


title:
Notion de $\theta$-r\'egulateurs d'un nombre alg\'ebrique. Conjectures
  p-adiques

abstract:
  Let K/Q be a Galois extension of degree n, of Galois group G, and let
$\eta\in K^\times$. For all large enough prime p, we define, by use of the
Frobenius theorem on group determinants, the family $(\Delta_p^\theta(\eta) \in
\F_p)_\theta$ of local $\theta$-regulators of $\eta$, indexed by the
Qp-irreducible characters $\theta$ of G. At each $\Delta_p^\theta (\eta)$ is
associated a linear representation $L^\theta \simeq \delta V_\theta$, $0 \leq
\delta \leq \varphi(1)$, which characterizes some properties of
$\Delta_p^\theta (\eta)$, including its nullity equivalent to $\delta \geq 1$
(Th. 3.11). When $\eta \in \Q^\times$ and $\theta = 1$, $\Delta_p^1 (\eta)$ is
the p-Fermat quotient of $\eta$. When $\eta$ is a "Minkowski unit", each
$\Delta_p^\theta (\eta)$, $\theta \ne 1$, gives the residue modulo p of the
$\theta$-component of $p^{1-n} Reg_p (K)$, where Reg(K) is the classical p-adic
regulator of K. We suggest that the "probability" of ($\Delta_p^\theta(\eta) =
0$ and $L^\theta \simeq \delta V_\theta$) is $\frac{O(1)}{p^{f \delta^2}}$,
where f is a suitable residue degree of p. We conjecture that $p^{1-n}
Reg_p(K)$, which measures the order of the p-torsion group in Abelian
p-ramification over K, is for p large enough a p-adic unit except perhaps for a
set of prime numbers of zero density. For these cases said "of minimal
p-divisibility" (Def. 3.17), it remains possible, $\eta$ being then a "partial
local pth power" at p, to propose, in connection with the ABC conjecture, a
stronger conjecture leading to the same conclusion for all large enough p
(Section 7). Some other conjectural aspects on the Fermat quotient are
discussed. We precise and verify these properties through numerical studies on
various fields and publish the corresponding "PARI" programs.


title:
Unsupervised Visual and Textual Information Fusion in Multimedia
  Retrieval - A Graph-based Point of View

abstract:
  Multimedia collections are more than ever growing in size and diversity.
Effective multimedia retrieval systems are thus critical to access these
datasets from the end-user perspective and in a scalable way. We are interested
in repositories of image/text multimedia objects and we study multimodal
information fusion techniques in the context of content based multimedia
information retrieval. We focus on graph based methods which have proven to
provide state-of-the-art performances. We particularly examine two of such
methods : cross-media similarities and random walk based scores. From a
theoretical viewpoint, we propose a unifying graph based framework which
encompasses the two aforementioned approaches. Our proposal allows us to
highlight the core features one should consider when using a graph based
technique for the combination of visual and textual information. We compare
cross-media and random walk based results using three different real-world
datasets. From a practical standpoint, our extended empirical analysis allow us
to provide insights and guidelines about the use of graph based methods for
multimodal information fusion in content based multimedia information
retrieval.


title:
Breaking the spell of Gaussianity: forecasting with higher order Fisher
  matrices

abstract:
  We present the new method DALI (Derivative Approximation for LIkelihoods) for
reconstructing and forecasting posteriors. DALI extends the Fisher Matrix
formalism but allows for a much wider range of posterior shapes. While the
Fisher Matrix formalism is limited to yield ellipsoidal confidence contours,
our method can reproduce the often observed flexed, deformed or curved shapes
of known posteriors. This gain in shape fidelity is obtained by expanding the
posterior to higher order in derivatives with respect to parameters, such that
non-Gaussianity in the parameter space is taken into account. The resulting
expansion is positive definite and normalizable at every order. Here, we
present the new technique, highlight its advantages and limitations, and show a
representative application to a posterior of dark energy parameters from
supernovae measurements.


title: Analysis of a low-energy correction to the eikonal approximation

abstract:
  Extensions of the eikonal approximation to low energy (20MeV/nucleon
typically) are studied. The relation between the dynamical eikonal
approximation (DEA) and the continuum-discretized coupled-channels method with
the eikonal approximation (E-CDCC) is discussed. When Coulomb interaction is
artificially turned off, DEA and E-CDCC are shown to give the same breakup
cross section, within 3% error, of $^{15}$C on $^{208}$Pb at 20MeV/nucleon.
When the Coulomb interaction is included, the difference is appreciable and
none of these models agrees with full CDCC calculations. An empirical
correction significantly reduces this difference. In addition, E-CDCC has a
convergence problem. By including a quantum-mechanical correction to E-CDCC for
lower partial waves between $^{15}$C and $^{208}$Pb, this problem is resolved
and the result perfectly reproduces full CDCC calculations at a lower
computational cost.


title: Accessibility percolation with backsteps

abstract:
  Consider a graph in which each site is endowed with a value called
\emph{fitness}. A path in the graph is said to be "open" or "accessible" if the
fitness values along that path is strictly increasing. We say that there is
accessibility percolation between two sites when such a path between them
exists. Motivated by the so called House-of-Cards model from evolutionary
biology, we consider this question on the $L$-hypercube $\{0,1\}^L$ where the
fitness values are independent random variables. We show that, in the large $L$
limit, the probability that an accessible path exists from an arbitrary
starting point to the (random) fittest site is no more than $x^*_{1/2}=
1-\frac12\sinh^{-1}(2) =0.27818\ldots$ and we conjecture that this probability
does converge to $x^*_{1/2}$. More precisely, there is a phase transition on
the value of the fitness $x$ of the starting site: assuming that the fitnesses
are uniform in $[0,1]$, we show that, in the large $L$ limit, there is almost
surely no path to the fittest site if $x>x^*_{1/2}$ and we conjecture that
there are almost surely many paths if $x<x^*_{1/2}$.
  If one conditions on the fittest site to be on the opposite corner of the
starting site rather than being randomly chosen, the picture remains the same
but with the critical point being now $x^*_1= 1-\sinh^{-1}(1)= 0.11863\ldots$.
Along the way, we obtain a large $L$ estimation for the number of self-avoiding
paths joining two opposite corners of the $L$-hypercube.


title:
Compatibilization of HDPE/agar biocomposites with eutectic-based ionic
  liquid containing surfactant

abstract:
  In this research, eutectic-based ionic liquid specifically choline
chloride/glycerol was prepared at a 1:2 mole ratio. The choline
chloride/glycerol was added with the different content of surfactant
(hexadecyltrimethylammonium bromide). The choline
chloride/glycerol-hexadecyltrimethylammonium bromide was introduced into
high-density polyethylene/agar biocomposites through melt mixing. The
mechanical testing results indicated that the impact strength and tensile
extension of the biocomposites increased with the introduction of the choline
chloride/glycerol-hexadecyltrimethylammonium bromide. The scanning electron
microscope, differential scanning calorimetry and thermal gravimetric analysis
results exhibited that significant decrease in the number of agar fillers
pull-out, melting point and thermal decomposition temperatures of the
biocomposites are also due to the choline
chloride/glycerol-hexadecyltrimethylammonium bromide. The Fourier transform
infrared spectra and X-ray diffractometer patterns of the biocomposites
introduced with the choline chloride/glycerol-hexadecyltrimethylammonium
bromide demonstrate the presence of physical interactions, which contributes to
the increase of compatibility between both high-density polyethylene and agar.
In conclusion, high-density polyethylene/agar biocomposites could be
compatibilized with eutectic-based ionic liquid containing surfactant, choline
chloride/glycerol-hexadecyltrimethylammonium bromide.


title:
How dusty is alpha Centauri? Excess or non-excess over the infrared
  photospheres of main-sequence stars

abstract:
  [Abridged] Debris discs around main-sequence stars indicate the presence of
larger rocky bodies. The components of the nearby binary aCentauri have higher
than solar metallicities, which is thought to promote giant planet formation.
We aim to determine the level of emission from debris in the aCen system.
Having already detected the temperature minimum, Tmin, of aCenA, we here
attempt to do so also for the companion aCenB. Using the aCen stars as
templates, we study possible effects Tmin may have on the detectability of
unresolved dust discs around other stars. We use Herschel and APEX photometry
to determine the stellar spectral energy distributions. In addition, we use
APEX for spectral line mapping to study the complex background around aCen seen
in the photometric images. Models of stellar atmospheres and discs are used to
estimate the amount of debris around these stars. For solar-type stars, a
fractional dust luminosity fd 2e-7 could account for SEDs that do not exhibit
the Tmin-effect. Slight excesses at the 2.5 sigma level are observed at 24 mu
for both stars, which, if interpreted to be due to dust, would correspond to fd
(1-3)e-5. Dynamical disc modelling leads to rough mass estimates of the
putative Zodi belts around the aCen stars, viz. <~4e-6 MMoon of 4 to 1000 mu
size grains, distributed according to n a^-3.5. Similarly, for filled-in Tmin
emission, corresponding EKBs could account for ~1e-3 MMoon of dust. Light
scattered and/or thermally emitted by exo-Zodi discs will have profound
implications for future spectroscopic missions designed to search for
biomarkers in the atmospheres of Earth-like planets. The F-IR SED of aCenB is
marginally consistent with the presence of a minimum temperature region in the
upper atmosphere. We also show that an aCenA-like temperature minimum may
result in an erroneous apprehension about the presence of dust around other
stars.


title: Strongly driven quantum pendulum of the OCS molecule

abstract:
  We demonstrate and analyze a strongly driven quantum pendulum in the angular
motion of stateselected and laser aligned OCS molecules. Raman-couplings during
the rising edge of a 50-picosecond laser pulse create a wave packet of pendular
states, which propagates in the confining potential formed by the
polarizability interaction between the molecule and the laser field. This
wave-packet dynamics manifests itself as pronounced oscillations in the degree
of alignment with a laser-intensity dependent period.


title:
Parity violating elastic electron scattering from 27Al and the Qweak
  measurement

abstract:
  I calculate the parity violating asymmetry A_{pv} for elastic electron
scattering from 27Al in order to compare with the Qweak experiment "background"
27Al measurement. I find that Coulomb distortions, and the quadrupole form
factor, reduce A_{pv} near the diffraction minimum. The Qweak data can be used
to confirm the neutron radius of 27Al, if nuclear structure uncertainties are
indeed small, as I suggest, and one can estimate inelastic and impurity
contributions. This could provide an important check of the measurement,
analysis, and theory.


title:
Local ISM 3D distribution and soft X-ray background: Inferences on
  nearby hot gas and the North Polar Spur

abstract:
  3D maps of the ISM can be used to locate not only IS clouds, but also IS
bubbles between the clouds that are blown by stellar winds and supernovae. We
compare our 3D maps of the IS dust to the ROSAT diffuse X-ray background maps.
In the Plane, there is a good correspondence between the locations and extents
of the mapped nearby cavities and the 0.25 keV background emission
distribution, showing that most of these nearby cavities contribute to this
soft X-ray emission. Assuming a constant dust to gas ratio and homogeneous 1MK
hot gas filling the cavities, we modeled in a simple way the 0.25 keV surface
brightness along the Galactic plane as seen from the Sun, taking into account
the absorption by the mapped clouds. The data-model comparison favors the
existence of hot gas in the Local Bubble (LB). The average mean pressure in the
local cavities is found to be on the order of about 10,000 cm-3K, in agreement
with previous studies. The model overestimates the emission from the huge
cavities in the 3rd quadrant. Using CaII absorption data, we show that the dust
to CaII ratio is very small in this region, implying the presence of a large
quantity of lower temperature (non-X-ray emitting) ionized gas, explaining at
least part of the discrepancy. In the meridian plane, the two main brightness
enhancements coincide well with the chimneys connecting the LB to the halo. No
nearby cavity is found towards the bright North Polar Spur (NPS) at high
latitude. We searched in the maps for the source regions of the 0.75 keV
enhancements in the 4th and 1st quadrants. Tunnels and cavities are found to
coincide with the main bright areas, however no tunnel nor cavity is found to
match the low-latitude, brightest part of the NPS. In addition, the comparison
between the maps and published spectra do not favor the nearby cavities located
within about 200pc as potential source regions for the NPS.


title: Supersymmetric geometries of IIA supergravity I

abstract:
  IIA supergravity backgrounds preserving one supersymmetry locally admit four
types of Killing spinors distinguished by the orbits of $Spin(9,1)$ on the
space of spinors. We solve the Killing spinor equations of IIA supergravity
with and without cosmological constant for Killing spinors representing two of
these orbits, with isotropy groups $Spin(7)$ and $Spin(7)\ltimes\mathbb{R}^8$.
In both cases, we identify the geometry of spacetime and express the fluxes in
terms of the geometry. We find that the geometric constraints of backgrounds
with a $Spin(7)\ltimes\mathbb{R}^8$ invariant Killing spinor are identical to
those found for heterotic backgrounds preserving one supersymmetry.


title: $D$-modules arithm\'etiques, distributions et localisation

abstract:
  Let $p$ be a prime number, $V$ a discrete valuation ring of unequal
caracteristics $(0,p)$, $G$ a smooth affine algebraic group over $Spec \,V$.
Using partial divided powers techniques of Berthelot, we construct arithmetic
distribution algebras, with level $m$, generalizing the classical construction
of the distribution algebra. We also construct the weak completion of the
classical distribution algebra. We then show that these distribution algebras
can be identified with invariant arithmetic differential operators over $G$. We
finally apply these constructions in the case of a reductive group and obtain a
localization theorem for the sheaf of arithmetic differential operators on the
formal flag variety obtained by $p$-adic completion, generalizing a previous
result of Ardakov-Wadsley (for the level 0 and with some condition on $p$).


title: Noncommutative ${\cal N}=2$ Chern-Simons-matter model

abstract:
  In this work we study the three-dimensional ${\cal N}=2$ supersymmetric
Chern-Simons-matter model in a noncommutative space-time. We construct the
action of the noncommutative $U(N)$ non-Abelian model in terms of explicit
${\cal N}=2$ supervariables by dimensionally reducing a four-dimensional ${\cal
N}=1$ supermultiplet. We also obtain the on-shell ${\cal N}=2$ supersymmetric
model writing it in terms of ${\cal N}=1$ superfields. In the noncommutative
Abelian case, we show that linear UV divergences are cancelled in Feynman
diagrams and logarithmic divergences are absent up to one-loop order, stating
that our model is free of UV/IR mixing.


title:
Elliptic Flow and Shear Viscosity of the Shattered Color Glass
  Condensate

abstract:
  In this talk, we report on our results about the computation of the elliptic
flow of the quark-gluon-plasma produced in relativistic heavy ion collisions,
simulating the expansion of the fireball by solving the relativistic Boltzmann
equation for the parton distribution function tuned at a fixed shear viscosity
to entropy density ratio $\eta/s$. We emphasize the role of saturation in the
initial gluon spectrum modelling the shattering of the color glass condensate,
causing the initial distribution to be out of equilibrium. We find that the
saturation reduces the efficiency in building-up the elliptic flow, even if the
thermalization process is quite fast $\tau_{therm} \approx 0.8 \,\rm fm/c$. and
the pressure isotropization even faster $\tau_{isotr} \approx 0.3 \,\rm fm/c$.
The impact of the initial non-equilibrium manifests for non-central collisions
and can modify the estimate of the viscosity respect to the assumption of full
thermalization in $p_T$-space.


title:
Adaptive Visual Tracking for Robotic Systems Without Image-Space
  Velocity Measurement

abstract:
  In this paper, we investigate the visual tracking problem for robotic systems
without image-space velocity measurement, simultaneously taking into account
the uncertainties of the camera model and the manipulator kinematics and
dynamics. We propose a new image-space observer that exploits the image-space
velocity information contained in the unknown kinematics, upon which, we design
an adaptive controller without using the image-space velocity signal where the
adaptations of the depth-rate-independent kinematic parameter and depth
parameter are driven by both the image-space tracking errors and observation
errors. The major superiority of the proposed observer-based adaptive
controller lies in its simplicity and the separation of the handling of
multiple uncertainties in visually servoed robotic systems, thus avoiding the
overparametrization problem of the existing work. Using Lyapunov analysis, we
demonstrate that the image-space tracking errors converge to zero
asymptotically. The performance of the proposed adaptive control scheme is
illustrated by a numerical simulation.


title: Infinite horizon stopping problems with (nearly) total reward criteria

abstract:
  We study an infinite horizon optimal stopping problem which arises naturally
in the optimal timing of a firm/project sale or in the valuation of natural
resources: the functional to be maximised is a sum of a discounted running
reward and a discounted final reward. The running and final rewards as well as
the instantaneous interest rate (used for calculating discount factors) depend
on a Feller-Markov process modelling the underlying randomness in the world,
such as prices of stocks, prices of natural resources (gas, oil, etc.), or
factors influencing the interest rate. For years, it had seemed sensible to
assume that interest rates were uniformly separated from 0, which is needed for
the existing theory to work. However, recent developments in Japan and in
Europe showed that interest rates can get arbitrarily close to 0. In this paper
we establish the feasibility of the stopping problem, prove the existence of
optimal stopping times and a variational characterisation (in the viscosity
sense) of the value function when interest rates are NOT uniformly separated
from 0. Our results rely on certain ergodic properties of the underlying
(non-uniformly) ergodic Markov process. We provide several criteria for
diffusions and jump-diffusions.


title:
Annealing Effect on Microstructure and Superconductivity of KxFeySe2
  Synthesized by an Easy One-step Method

abstract:
  High-quality superconducting KxFeySe2 single crystals were synthesized using
an easy one-step method. Detailed annealing studies were performed to make
clear the phase formation process in KxFeySe2. Compatible observations were
found in temperature-dependent X-ray diffraction patterns, back-scattered
electron images and corresponding electromagnetic properties, which proved that
good superconductivity performance was close related to the microstructure of
superconducting component. Analysis based on the scaling behavior of flux
pinning force indicated that the dominant pinning mechanism was delta(Tc)
pinning and independent of connectivity. The annealing dynamics studies were
also performed, which manifested that the humps in temperature-dependent
resistance (RT) curves were induced by competition between the
metallic/superconducting and the semiconducting/insulating phases.


title: Independence Logic and Abstract Independence Relations

abstract:
  We continue the work on the relations between independence logic and the
model-theoretic analysis of independence, generalizing the results of [15] and
[16] to the framework of abstract independence relations for an arbitrary AEC.
We give a model-theoretic interpretation of the independence atom and
characterize under which conditions we can prove a completeness result with
respect to the deductive system that axiomatizes independence in team semantics
and statistics.


title:
Systematic Effects at Criticality for the SU(2)-Landau-Gauge Gluon
  Propagator

abstract:
  We analyze data from finite-temperature simulations of the gluon propagator
in SU(2) Landau gauge on large lattices. We argue that the singular behavior of
this quantity around the deconfinement transition, seen in several previous
studies, is a lattice artifact.


title: Dynamic construction of martingales of density functions

abstract:
  The density hypothesis on random times becomes now a standard in modeling of
risks. One of the basic reasons to introduce the density hypothesis is the
desire to have a computable credit risk model. However, recent work shows that
merely an existence of a density function for the conditional law of the random
times will not be enough for the purposes of some numerical implantation
problems. It becomes necessary to have models with martingales of density
functions evolving along with the development of the information flow, in
particular, to have Markovian martingales of density functions determined by a
stochastic differential equation. The quetion of constructing a martingale of
density functions by a stochastic differential equation has been answered in
one dimensional case. The aim of this note is to provide a solution in higher
dimensional cases.


title:
Voltage controlled propagating spin waves on a perpendicularly
  magnetized nanowire

abstract:
  We numerically and analytically investigate the voltage controlled spin wave
(SW) propagations in a nanowire with locally manipulated perpendicular magnetic
anisotropy (PMA) by applying an electric field. It is shown that the velocity
and wavelength of the propagating SWs are tailored by the modified PMA, which
can be locally controlled by the external electric field. First, we observe a
phase shift when the propagating SWs pass through the area of locally modified
PMA. By introducing phase control of the SWs, we finally propose a three
terminal SW device. Constructive/destructive interferences of two propagating
SWs are controlled at the detecting area by the voltage controlled phase shift.


title:
Hydrothermal alteration at the Panorama Formation, North Pole Dome,
  Pilbara Craton, Western Australia

abstract:
  An airborne hyperspectral remote sensing dataset was obtained of the North
Pole Dome region of the Pilbara Craton in October 2002. It has been analyzed
for indications of hydrothermal minerals. Here we report on the identification
and mapping of hydrothermal minerals in the 3.459 Ga Panorama Formation and
surrounding strata. The spatial distribution of a pattern of subvertical
pyrophyllite rich veins connected to a pyrophyllite rich palaeohorizontal layer
is interpreted to represent the base of an acid-sulfate epithermal system that
is unconformably overlain by the stromatolitic 3.42 Ga Strelley Pool Chert.


title: Spacetime correlators of perturbations in slow-roll de Sitter inflation

abstract:
  Two-point correlators and self-correlators of primordial perturbations in
quasi-de Sitter spacetime backgrounds are considered. For large separations
two-point correlators exhibit nearly scale invariance, while for short
distances self-correlators need standard renormalization. We study the
deformation of two-point correlators to smoothly match the self-correlators at
coincidence. The corresponding angular power spectrum is evaluated in the
Sachs-Wolfe regime of low multipoles. Scale invariance is maintained, but the
amplitude of $C_{\ell}$ could change in a non-trivial way.


title: A sensitive search for methanol line emission toward evolved stars

abstract:
  We present a sensitive search for methanol line emission in evolved stars at
1 cm, aiming to detect, for the first time, methanol masers in this type of
objects. Our sample comprised post-AGB stars and young planetary nebulae (PNe),
whose mass-loss processes and circumstellar structures resemble those of young
stellar objects (YSOs), where methanol masers are detected. Class I masers were
searched for in 73 objects, whereas Class II ones were searched in 16. No
detection was obtained. The non-detection of Class I methanol masers indicated
that methanol production in dust grains and/or the enhancement of its gas-phase
abundance in the shocked regions of evolved objects are not as efficient as in
YSOs. We suggest that relatively more evolved PNe might have a better
probability of harboring Class II masers.


title: Dynamic Equilibria in Fluid Queuing Networks

abstract:
  This paper continues the study of equilibria for flows over time in the fluid
queueing model recently considered by Koch and Skutella [10]. We provide a
constructive proof for the existence and uniqueness of equilibria in the case
of a single origin-destination with piecewise constant inflow rates, through a
detailed analysis of the static flows obtained as derivatives of a dynamic
equilibrium. We also give a nonconstructive existence proof of equilibria when
the inflow rates belong to $L^p$ including the extension to multiple
origin-destinations.


title: Spin chains and classical strings in rotating Rindler-AdS space

abstract:
  In this paper, we study the spin chain and string excitation in the rotating
Rindler-$AdS_3$ proposed in [12]. We obtain a one-parameter deformed $SL(2)$
spin chain at the fast spin limit. Two-spin GKP-like solutions are studied at
short and long string limits. General ansatz for the giant magnons and the
spiky strings are analyzed in detail for various $\beta$. At last, we explore
its counterpart in analytic continuation and pp-wave limit.


title: Primitive bound of a 2-structure

abstract:
  A 2-structure on a set $S$ is given by an equivalence relation on the set of
ordered pairs of distinct elements of $S$. A subset $C$ of $S$, any two
elements of which appear the same from the perspective of each element of the
complement of $C$, is called a clan. The number of elements that must be added
in order to obtain a 2-structure the only clans of which are trivial is called
the primitive bound of the 2-structure. The primitive bound is determined for
arbitrary 2-structures of any cardinality. This generalizes the classical
results of Erd\H{o}s et al. and Moon for tournaments, as well as the result of
Brignall et al. for finite graphs, and the precise results of Boussa\"{\i}ri
and Ille for finite graphs, providing new proofs which avoid extensive use of
induction in the finite case.


title:
Evolution of Quantum Fluctuations Near the Quantum Critical Point of the
  Transverse Field Ising Chain System CoNb$_2$O$_6$

abstract:
  The transverse field Ising chain (TFIC) model is ideally suited for testing
the fundamental ideas of quantum phase transitions, because its well-known
$T=0$ ground state can be extrapolated to finite temperatures. Nonetheless, the
lack of appropriate model materials hindered the past effort to test the
theoretical predictions. Here we map the evolution of quantum fluctuations in
the TFIC based on Nuclear Magnetic Resonance (NMR) measurements of
CoNb$_2$O$_6$, and demonstrate the finite temperature effects on quantum
criticality for the first time. From the temperature dependence of the
$^{93}$Nb longitudinal relaxation rate $1/T_1$, we identify the renormalized
classical, quantum critical, and quantum disordered scaling regimes in the
temperature ($T$) vs. transverse magnetic field ($h_{\perp}$) phase diagram.
Precisely at the critical field $h_{\perp}^{c}=5.25 \pm 0.15$ T, we observe a
power-law behavior, $1/T_{1} \sim T^{-3/4}$, as predicted by quantum critical
scaling. Our parameter-free comparison between the data and theory reveals that
quantum fluctuations persist up to as high as $T \sim 0.4 J$, where the
intra-chain exchange interaction $J$ is the only energy scale of the problem.


title:
Next-to-Leading-Order study on the associate production of
  $J/\psi+\gamma$ at the LHC

abstract:
  The associate $J/\psi+\gamma$ production at the LHC is studied completely at
next-to-leading-order (NLO) within the framework of nonrelativistic QCD. By
using three sets of color-octet long-distance matrix elements (LDMEs) obtained
in previous prompt $J/\psi$ studies, we find that only one of them can result
in a positive transverse momentum ($p_t$) distribution of $J/\psi$ production
rate at large $p_t$ region. Based on reasonable consideration to cut down
background, our estimation is measurable upto $p_t=50$GeV with present data
sample collected at $8$TeV LHC. All the color-octet LDMEs in $J/\psi$
production could be fixed sensitively by including this proposed measurement
and our calculation, and then confident conclusion on $J/\psi$ polarization
puzzle could be achieved.


title: The depinning transition in presence of disorder: a toy model

abstract:
  We introduce a toy model, which represents a simplified version of the
problem of the depinning transition in the limit of strong disorder. This toy
model can be formulated as a simple renormalization transformation for the
probability distribution of a single real variable. For this toy model, {the
critical line is known exactly in one particular case} and it can be calculated
perturbatively in the general case. One can also show that, at the transition,
there is no strong disorder fixed distribution accessible by renormalization.
Instead, both our numerical and analytic approaches indicate a transition of
infinite order (of the Berezinskii-Kosterlitz-Thouless type). We give numerical
evidence that this infinite order transition persists for the problem of the
depinning transition with disorder on the hierarchical lattice.


title: Curvature Properties of G\"{o}del metric

abstract:
  The main aim of this article is to investigate the geometric structures
admitting by the G\"{o}del spacetime which produces a new class of
semi-Riemannian manifolds (see Theorem 4.1 and Theorem 4.5). We also consider
some extension of G\"{o}del metric (see Example 4.1).


title: Radiative Lepton Model and Dark Matter with Global $U(1)'$ Symmetry

abstract:
  We propose a radiative lepton model, in which the charged lepton masses are
generated at one-loop level, and the neutrino masses are induced at two-loop
level. On the other hand, tau mass is derived at tree level since it is too
heavy to generate radiatively. Then we discuss muon anomalous magnetic moment
together with the constraint of lepton flavor violation. A large muon magnetic
moment is derived due to the vector like charged fermions which are newly added
to the standard model. In addition, considering a scalar dark matter in our
model, a strong gamma-ray signal is produced by dark matter annihilation via
internal bremsstrahlung. We can also obtain the effective neutrino number by
the dark radiation of the Goldstone boson coming from the imposed global
$U(1)'$ symmetry.


title: Topological magnetic crystalline insulators and co-representation theory

abstract:
  Gapless surface states of time reversal invariant topological insulators are
protected by the anti-unitary nature of the time reversal operation. Very
recently, this idea was generalized to magnetic structures, in which time
reversal symmetry is explicitly broken, but there is still an anti-unitary
symmetry operation combining time reversal symmetry and crystalline symmetry.
These topological phases in magnetic structures are dubbed "topological
magnetic crystalline insulators". In this work, we present a general theory of
topological magnetic crystalline insulators in different types of magnetic
crystals based on the co-representation theory of magnetic crystalline symmetry
groups. We construct two concrete tight-binding models of topological magnetic
crystalline insulators, the $\hat{C}_4\Theta$ model and the $\hat{\bf
\tau}\Theta$ model, in which topological surface states and topological
invariants are calculated explicitly. Moreover, we check different types of
anti-unitary operators in magnetic systems and find that the systems with
$\hat{C}_4\Theta$, $\hat{C}_6\Theta$ and $\hat{\bf \tau}\Theta$ symmetry are
able to protect gapless surface states. Our work will pave the way to search
for topological magnetic crystalline insulators in realistic magnetic
materials.


title: Some prime factorization results for free quantum group factors

abstract:
  We prove some unique factorization results for tensor products of free
quantum group factors. They are type III analogues of factorization results for
direct products of bi-exact groups established by Ozawa and Popa. In the proof,
we first take continuous cores of the tensor products, which satisfy a
condition similar to condition (AO), and discuss some factorization properties
for the continuous cores. We then deduce factorization properties for the
original type III factors. We also prove some unique factorization results for
crossed product von Neumann algebras by direct products of bi-exact groups.


title: Where Have All the Goldstone Bosons Gone?

abstract:
  According to a commonly held view of spontaneously broken symmetry in gauge
theories, troublesome Nambu-Goldstone bosons are effectively eliminated by
turning into longitudinal modes of a massive vector meson. This note shows that
this is not in fact a consistent view of the role of Nambu-Goldstone bosons in
such theories. These particles necessarily appear as gauge excitations whenever
they are formulated in a manifestly covariant gauge. The radiation gauge
provides therefore the dual advantage of circumventing the Goldstone theorem
and making evident the disappearance of these particles from the physical
spectrum.


title: Support and adic finiteness for complexes

abstract:
  Let $X$ be a chain complex over a commutative noetherian ring $R$, that is,
an object in the derived category $\mathcal{D}(R)$. We investigate the small
support and co-support of $X$, introduced by Foxby and Benson, Iyengar, and
Krause. We show that the derived functors $M \otimes_R^{\mathbf{L}} -$ and
$\mathbf{R}\operatorname{Hom}_R(M,-)$ can detect isomorphisms in
$\mathcal{D}(R)$ between complexes with restrictions on their supports or
co-supports. In particular, the derived local (co)homology functors
$\mathbf{R}\Gamma_{\mathfrak{a}}(-)$ and $\mathbf{L}\Lambda_{\mathfrak{a}}(-)$
with respect to an ideal $\mathfrak{a}\subsetneq R$ have the same ability.
Furthermore, we give reprove some results of Benson, Iyengar, and Krause in our
setting, with more direct proofs. Also, we include some computations of
co-supports, since this construction is still quite mysterious. Lastly, we
investigate "$\mathfrak{a}$-adically finite" $R$-complexes, that is, the
$X\in\mathcal{D}(R)$ that are $\mathfrak{a}$-cofinite \textit{\`a la}
Hartshorne. For instance, we characterize these complexes in terms of a
finiteness condition on $\mathbf{L}\Lambda_{\mathfrak{a}}(X)$.


title: Performance Analysis of Tyler's Covariance Estimator

abstract:
  This paper analyzes the performance of Tyler's M-estimator of the scatter
matrix in elliptical populations. We focus on the non-asymptotic setting and
derive the estimation error bounds depending on the number of samples n and the
dimension p. We show that under quite mild conditions the squared Frobenius
norm of the error of the inverse estimator decays like p^2/n with high
probability.


title:
Attosecond electronic and nuclear quantum photodynamics of ozone:
  time-dependent Dyson orbitals and dipole

abstract:
  A nonadiabatic scheme for the description of the coupled electron and nuclear
motions in the ozone molecule was proposed recently. An initial coherent
nonstationary state was prepared as a superposition of the ground state and the
excited Hartley band. In this situation neither the electrons nor the nuclei
are in a stationary state. The multiconfiguration time dependent Hartree method
was used to solve the coupled nuclear quantum dynamics in the framework of the
adiabatic separation of the time-dependent Schr\"odinger equation. The
resulting wave packet shows an oscillation of the electron density between the
two chemical bonds. As a first step for probing the electronic motion we
computed the time-dependent molecular dipole and the Dyson orbitals. The latter
play an important role in the explanation of the photoelectron angular
distribution. Calculations of the Dyson orbitals are presented both for the
time-independent as well as the time-dependent situations. We limited our
description of the electronic motion to the Franck-Condon region only due to
the localization of the nuclear wave packets around this point during the first
5-6 fs.


title:
Linear independent solutions and operational representations for
  hypergeometric functions of four variables

abstract:
  In investigation of boundary-value problems for certain partial differential
equations arising in applied mathematics, we often need to study the solution
of system of partial differential equations satisfied by hypergeometric
functions and find explicit linearly independent solutions for the system. Here
we choose the Exton function $K_{2}$ among his 21 functions to show how to find
the linearly independent solutions of partial differential equations satisfied
by this function $K_{2}$. Based upon the classical derivative and integral
operators we introduce a new operational images for hypergeometric function
$K_{2}$. By means of these operational images a number of finite series and
decomposition formulas are then fund.


title: Computing support for advanced medical data analysis and imaging

abstract:
  We discuss computing issues for data analysis and image reconstruction of
PET-TOF medical scanner or other medical scanning devices producing large
volumes of data. Service architecture based on the grid and cloud concepts for
distributed processing is proposed and critically discussed.

categories: physics.comp-ph cs.CV cs.DC physics.ins-det physics.med-ph


title:
Deformed Twistors and Higher Spin Conformal (Super-)Algebras in Six
  Dimensions

abstract:
  Massless conformal scalar field in six dimensions corresponds to the minimal
unitary representation (minrep) of the conformal group SO(6,2). This minrep
admits a family of deformations labelled by the spin t of an SU(2)_T group,
which is the 6d analog of helicity in four dimensions. These deformations of
the minrep of SO(6,2) describe massless conformal fields that are symmetric
tensors in the spinorial representation of the 6d Lorentz group. The minrep and
its deformations were obtained by quantization of the nonlinear realization of
SO(6,2) as a quasiconformal group in arXiv:1005.3580. We give a novel
reformulation of the generators of SO(6,2) for these representations as
bilinears of deformed twistorial oscillators which transform nonlinearly under
the Lorentz group SO(5,1) and apply them to define higher spin algebras and
superalgebras in AdS_7. The higher spin (HS) algebra of Fradkin-Vasiliev type
in AdS_7 is simply the enveloping algebra of SO(6,2) quotiented by a two-sided
ideal (Joseph ideal) which annihilates the minrep. We show that the Joseph
ideal vanishes identically for the quasiconformal realization of the minrep and
its enveloping algebra leads directly to the HS algebra in AdS_7. Furthermore,
the enveloping algebras of the deformations of the minrep define a discrete
infinite family of HS algebras in AdS_7 for which certain 6d Lorentz covariant
deformations of the Joseph ideal vanish identically. These results extend to
superconformal algebras OSp(8*|2N) and we find a discrete infinite family of HS
superalgebras as enveloping algebras of the minimal unitary supermultiplet and
its deformations. Our results suggest the existence of a discrete family of
(supersymmetric) HS theories in AdS_7 which are dual to free (super)conformal
field theories (CFTs) or to interacting but integrable (supersymmetric) CFTs in
6d.


title: How the Sando Search Tool Recommends Queries

abstract:
  Developers spend a significant amount of time searching their local codebase.
To help them search efficiently, researchers have proposed novel tools that
apply state-of-the-art information retrieval algorithms to retrieve relevant
code snippets from the local codebase. However, these tools still rely on the
developer to craft an effective query, which requires that the developer is
familiar with the terms contained in the related code snippets. Our empirical
data from a state-of-the-art local code search tool, called Sando, suggests
that developers are sometimes unacquainted with their local codebase. In order
to bridge the gap between developers and their ever-increasing local codebase,
in this paper we demonstrate the recommendation techniques integrated in Sando.


title:
Measurement of the $B_c^+$ meson lifetime using $B_c^+ \to
  J\!/\!\psi\mu^+ \nu_{\mu} X$ decays

abstract:
  The lifetime of the $B_c^+$ meson is measured using semileptonic decays
having a $J\!/\!\psi$ meson and a muon in the final state. The data,
corresponding to an integrated luminosity of $2\mathrm{~fb^{-1}}$, are
collected by the LHCb detector in $pp$ collisions at a centre-of-mass energy of
$8\,\mathrm{TeV}$. The measured lifetime is $$\tau = 509 \pm 8 \pm 12
\mathrm{~fs},$$ where the first uncertainty is statistical and the second is
systematic.


title: Some Results Related to Soft Topological Spaces

abstract:
  The notion of soft sets is introduced as a general mathematical tool for
dealing with uncertainty. In this paper, we consider the concepts of soft
compactness, countably soft compactness and obtain some results. We study some
soft separation axioms that have been studied by Min and Shabir-Naz. By
constructing a special soft topological space, show that some classical results
in general topology are not true about soft topological spaces, for instance
every compact Housdorff spaces need not be normal.


title: Fuzzy subgroups commutativity degree of dihedral groups

abstract:
  In this paper we introduce and study the concept of distinct fuzzy subgroups
commutativity degree of a finite group G. This quantity measures the
probability of two random distinct fuzzy subgroups of G commuting. We determine
distinct fuzzy subgroup commutativity degree for some of finite groups.


title: Capillary surfaces inside polyhedral regions

abstract:
  In this paper we provide a large new family of embedded capillary surfaces
inside polyhedral regions in the Euclidean space. The angle of contact of the
examples we furnish is prescribed to be any value in $(\frac{\pi}{2}, \pi]$ and
it is allowed to vary from one boundary component to the other.


title: On The Equality Of The Grundy Numbers Of A Graph

abstract:
  Our work becomes integrated into the general problem of the stability of the
network ad hoc. Some, works attacked this problem. Among these works, we find
the modelling of the network ad hoc in the form of a graph. Thus the problem of
stability of the network ad hoc which corresponds to a problem of allocation of
frequency amounts to a problem of allocation of colors in the vertex of graph.
we present use a parameter of coloring the number of Grundy. The Grundy number
of a graph G, denoted by (G), is the largest k such that G has a greedy
k-coloring, that is a coloring with colours obtained by applying the greedy
algorithm according to some ordering of the vertices of G. In this paper, we
study the Grundy number of the lexicographic, Cartesian and direct products of
two graphs in terms of the Grundy numbers of these graphs.


title: S-pure Extensions of Locally Compact Abelian Groups

abstract:
  In this paper, we introduce the concept and study some properties of an
s-pure subgroup and a s-pure extension in the category of locally compact
abelian groups.


title:
Conclusions of the MITP Workshop on T Violation and CPT Tests in
  Neutral-Meson Systems

abstract:
  The conclusions summarize the main, but not all, aspects of a two-days
workshop held at MITP Mainz. The four covered aspects are T violation in decays
of neutral B mesons, T and CPT studies in B0B0bar transitions with Belle,
future measurements of T violation in B and D decays, and direct tests of T and
CPT symmetries in the entangled neutral Kaon system at a ?Phi factory.


title:
Spin-caloric transport properties of cobalt nanostructures: spin
  disorder effects from first principles

abstract:
  The fundamental aspects of spin-dependent transport processes and their
interplay with temperature gradients, as given by the spin Seebeck coefficient,
are still largely unexplored and a multitude of contributing factors must be
considered. We used density functional theory together with a Monte-Carlo-based
statistical method to simulate simple nanostructures, such as Co nanowires and
films embedded in a Cu host or in vacuum, and investigated the influence of
spin-disorder scattering on electron transport at elevated temperatures. While
we show that the spin-dependent scattering of electrons due to temperature
induced disorder of the local magnetic moments contributes significantly to the
resistance, thermoelectric and spin-caloric transport coefficients, we also
conclude that the actual magnitude of these effects cannot be predicted,
quantitatively or qualitatively, without such detailed calculations.


title:
Towards weighing the condensation energy to ascertain the Archimedes
  force of vacuum

abstract:
  The force exerted by the gravitational field on a Casimir cavity in terms of
Archimedes force of vacuum is discussed, the force that can be tested against
observation is identified, and it is shown that the present technology makes it
possible to perform the first experimental tests. The use of suitable high-Tc
superconductors as modulators of Archimedes force is motivated. The possibility
is analyzed of using gravitational wave interferometers as detectors of the
force, transported through an optical spring from the Archimedes vacuum force
apparatus to the gravitational interferometer test masses to maintain the two
systems well separated. The use of balances to actuate and detect the force is
also analyzed, the different solutions are compared, and the most important
experimental issues are discussed.


title: On nonlocality as a resource theory and nonlocality measures

abstract:
  With the advent of device independent quantum information processing,
nonlocality is nowadays regarded as a resource to implement various tasks. On
the analogy of entanglement theory we approach nonlocality from this
perspective. In order to do so, we analyze in full detail the operations that
can be implemented in this scenario and under which nonlocality cannot
increase. This provides a theoretical ground to study how to order and quantify
nonlocal behaviours. Finally, we review several nonlocality measures and
discuss their validity from this point of view.


title: Dimensions in non-Archimedean geometries

abstract:
  Let $K$ be an algebraically closed non-Archimedean field. Leonard Lipshitz
has introduced a manageable notion of subanalytic sets of the unit polydisc.
This class contains the class of affinoid sets and is stable under projection.
We associate to a subanalytic set its counterpart in the Berkovich polydisc.
This allows us to give a new insight to the dimension of subanalytic sets using
the degrees of the completed residual fields. With these methods we obtain new
results, such as the invariance of the dimension under subanalytic bijection in
any characteristic. Then we study more generally subsets $S$ of $K^m\times
\Gamma^n$ and of $K^m\times \Gamma^n \times k^p$ where $\Gamma$ is the value
group and $k$ the residue field. We allow $S$ to be either definable in ACVF,
or definable in the analytic language of L. Lipshitz. We define a dimension for
such sets $S$. In the case when $S \subset K^n$ (resp. $S\subset \Gamma^n$,
$S\subset k^n$), it coincides with the above dimension (resp. the o-minimal
dimension, the Zariski dimension). We prove that this dimension is invariant
under definable bijection and decreases under projection. This allows us to
generalize previous results on tropicalization of Berkovich spaces and to place
them in a general framework.


title: The critical impact speed for the splash of a drop

abstract:
  Making use of experimental and theoretical considerations, in this Letter we
deduce a criterion to determine the critical velocity for which a drop
impacting a smooth dry surface either spreads over the substrate or
disintegrates into smaller droplets. The derived equation, which expresses the
splash threshold velocity as a function of the material properties of the two
fluids involved, the drop radius and the mean free path of the molecules
composing the surrounding gaseous atmosphere, has been thoroughly validated
experimentally at normal atmospheric conditions using eight different liquids,
with viscosities ranging from $3\times 10^{-4}$ to $10^{-2}$ Pa$\cdot$s and
interfacial tension coefficients which vary between $17$ and $72$
mN$\cdot$m$^{-1}$.


title: Run-and-tumble particles in speckle fields

abstract:
  The random energy landscapes developed by speckle fields can be used to
confine and manipulate a large number of micro-particles with a single laser
beam. By means of molecular dynamics simulations, we investigate the static and
dynamic properties of an active suspension of swimming bacteria embedded into
speckle patterns. Looking at the correlation of the density fluctuations and
the equilibrium density profiles, we observe a crossover phenomenon when the
forces exerted by the speckles are equal to the bacteria's propulsion.


title: Efficient achievability for quantum protocols using decoupling theorems

abstract:
  Proving achievability of protocols in quantum Shannon theory usually does not
consider the efficiency at which the goal of the protocol can be achieved.
Nevertheless it is known that protocols such as coherent state merging are
efficiently achievable at optimal rate. We aim to investigate this fact further
in a general one-shot setting, by considering certain classes of decoupling
theorems and give exact rates for these classes. Moreover we compare results of
general decoupling theorems using Haar distributed unitaries with those using
smaller sets of operators, in particular $\epsilon$-approximate 2-designs. We
also observe the behavior of our rates in special cases such as $\epsilon$
approaching zero and the asymptotic limit.


title:
On the Accuracy of the GN-Model and on Analytical Correction Terms to
  Improve It

abstract:
  The GN-model has been proposed as an approximate but sufficiently accurate
tool for predicting uncompensated optical coherent transmission system
performance, in realistic scenarios. For this specific use, the GN-model has
enjoyed substantial validation, both simulative and experimental. Recently,
however, it has been pointed out that its predictions, when used to obtain a
detailed picture of non-linear interference (NLI) noise accumulation along a
link, may be affected by a substantial NLI overestimation error, especially in
the first spans of the link. In this paper we analyze in detail the GN-model
errors. We discuss recently proposed formulas for correcting such errors and
show that they neglect several contributions to NLI, so that they may
substantially underestimate NLI in specific situations, especially over
low-dispersion fibers. We derive a complete set of formulas accounting for all
single, cross, and multi-channel effects, this set constitutes what we have
called the enhanced GN-model (EGN-model). We extensively validate the EGN model
by comparison with accurate simulations in several different system scenarios.
The overall EGN model accuracy is found to be very good when assessing detailed
span-by-span NLI accumulation and excellent when estimating realistic system
maximum reach. The computational complexity vs. accuracy trade-offs of the
various versions of the GN and EGN models are extensively discussed.


title: EChO spectra and stellar activity II. The case of dM stars

abstract:
  EChO is a dedicated mission to investigate exoplanetary atmospheres. When
extracting the planetary signal, one has to take care of the variability of the
hosting star, which introduces spectral distortion that can be mistaken as
planetary signal. Magnetic variability is a major deal in particular for M
stars. To this purpose, assuming a one spot dominant model for the stellar
photosphere, we develop a mixed observational-theoretical tool to extract the
spot's parameters from the observed optical spectrum. This method relies on a
robust library of spectral M templates, which we derive using the observed
spectra of quiet M dwarfs in the SDSS database. Our procedure allows to correct
the observed spectra for photospheric activity in most of the analyzed cases,
reducing the spectral distortion down to the noise levels. Ongoing refinements
of the template library and the algorithm will improve the efficiency of our
algorithm.


title: Is there a map between Galilean relativity and special relativity?

abstract:
  Mandanici has provided a map which he claims to be a two way map between
Galilean relativity and special relativity. We argue that this map is simply a
curvilinear coordinate system on a subset of the two-dimensional Minkowski
space-time, and is not a two way map between 1+1 dimensional Galilean
relativity and 1+1 dimensional special relativity.


title:
Imprinting a topological interface using Zeeman shifts in an atomic
  spinor Bose-Einstein condensate

abstract:
  We propose to use spatial control of the Zeeman energy shifts in an ultracold
atomic gas to engineer an interface between topologically distinct regions.
This provides an experimentally accessible means for studying the interface
physics of topological defects and textures. Using the spin-1 Bose-Einstein
condensate as an example, we find spinor wave functions that represent defects
and textures continuously connecting across the interface between polar and
ferromagnetic regions induced by spatially varying Zeeman shifts. By numerical
energy minimization we characterize the defect core structures and determine
the energetic stability. The techniques proposed could potentially be used in
the laboratory to emulate complex interface physics arising, e.g., in
cosmological and condensed-matter contexts in both uniform and lattice systems.


title:
The Casimir effect with quantized charged scalar matter in background
  magnetic field

abstract:
  We study the influence of a background uniform magnetic field and boundary
conditions on the vacuum of a quantized charged massive scalar matter field
confined between two parallel plates; the magnetic field is directed
orthogonally to the plates. The admissible set of boundary conditions at the
plates is determined by the requirements that the operator of one-particle
energy squared be self-adjoint and positive definite. We show that, in the case
of a weak magnetic field and a small separation of the plates, the Casimir
force is either attractive or repulsive, depending on the choice of a boundary
condition. In the case of a strong magnetic field and a large separation of the
plates, the Casimir force is repulsive, being independent of the choice of a
boundary condition, as well as of the distance between the plates.


title:
Inequality in Societies, Academic Institutions and Science Journals:
  Gini and k-indices

abstract:
  Social inequality is traditionally measured by the Gini-index ($g$). The
$g$-index takes values from $0$ to $1$ where $g=0$ represents complete equality
and $g=1$ represents complete inequality. Most of the estimates of the income
or wealth data indicate the $g$ value to be widely dispersed across the
countries of the world: \textit{g} values typically range from $0.30$ to $0.65$
at a particular time (year). We estimated similarly the Gini-index for the
citations earned by the yearly publications of various academic institutions
and the science journals. The ISI web of science data suggests remarkably
strong inequality and universality ($g=0.70\pm0.07$) across all the
universities and institutions of the world, while for the journals we find
$g=0.65\pm0.15$ for any typical year. We define a new inequality measure,
namely the $k$-index, saying that the cumulative income or citations of ($1-k$)
fraction of people or papers exceed those earned by the fraction ($k$) of the
people or publications respectively. We find, while the $k$-index value for
income ranges from $0.60$ to $0.75$ for income distributions across the world,
it has a value around $0.75\pm0.05$ for different universities and institutions
across the world and around $0.77\pm0.10$ for the science journals. Apart from
above indices, we also analyze the same institution and journal citation data
by measuring Pietra index and median index.


title: On the derived Picard group of the Brauer star algebra

abstract:
  In this paper we show that the derived Picard group $TrPic(A)$ of the Brauer
star algebra of type $(n,t)$ is generated by shift, $Pic(A)$ and equivalences
$\{H_i\}_{i=1}^n$ in the case $t>1$, where $H_i$ were shown to satisfy the
relations of the braid group on the affine diagram $\widetilde{A}_{n-1}$ by
Schaps and Zakay-Illouz. In the multiplicity free case we show that $TrPic(A)$
is generated by a slightly bigger set.


title: Inhomogeneities in 3 dimensional oscillatory media

abstract:
  We consider localized perturbations to spatially homogeneous oscillations in
dimension 3 using the complex Ginzburg-Landau equation as a prototype. In
particular, we will focus on heterogeneities that locally change the phase of
the oscillations. In the usual translation invariant spaces and at $
\varepsilon=0$ the linearization about these spatially homogeneous solutions
result in an operator with zero eigenvalue embedded in the essential spectrum.
In contrast, we show that when considered as an operator between Kondratiev
spaces, the linearization is a Fredholm operator. These spaces consist of
functions with algebraical localization that increases with each derivative. We
use this result to construct solutions close to the equilibrium via the
Implicit Function Theorem and derive asymptotics for wavenumbers in the far
field.


title:
Quantification of propidium iodide delivery with millisecond electric
  pulses: A model study

abstract:
  A model study of propidium iodide delivery with millisecond electric pulses
is presented; this work is a companion of the experimental efforts by Sadik et
al. [1]. Both membrane permeabilization and delivery are examined with respect
to six extra-cellular conductivities. The transmembrane potential of the
permeabilized regions exhibits a consistent value, which corresponds to a
bifurcation point in the pore-radius-potential relation. Both the pore area
density and membrane conductance increase with an increasing extra-cellular
conductivity. On the other hand, the inverse correlation between propidium
iodide delivery and extra-cellular conductivity as observed in the experiments
is quantitatively captured by the model. This agreement confirms that this
behavior is primarily mediated by electrophoretic transport during the pulse.
The results suggest that electrophoresis is important even for the delivery of
small molecules such as propidium iodide. The direct comparison between model
prediction and experimental data presented in this work helps validate the
former as a robust predictive tool for the study of electroporation.


title: Modeling Credit Spreads Using Nonlinear Regression

abstract:
  The term structure of credit spreads is studied with an aim to predict its
future movements. A completely new approach to tackle this problem is
presented, which utilizes nonlinear parametric models. The Brain-Cousens
regression model with five parameters is chosen to describe the term structure
of credit spreads. Further, we investigate the dependence of the parameter
changes over time and the determinants of credit spreads.


title: A continuous-time approach to online optimization

abstract:
  We consider a family of learning strategies for online optimization problems
that evolve in continuous time and we show that they lead to no regret. From a
more traditional, discrete-time viewpoint, this continuous-time approach allows
us to derive the no-regret properties of a large class of discrete-time
algorithms including as special cases the exponential weight algorithm, online
mirror descent, smooth fictitious play and vanishingly smooth fictitious play.
In so doing, we obtain a unified view of many classical regret bounds, and we
show that they can be decomposed into a term stemming from continuous-time
considerations and a term which measures the disparity between discrete and
continuous time. As a result, we obtain a general class of infinite horizon
learning strategies that guarantee an $\mathcal{O}(n^{-1/2})$ regret bound
without having to resort to a doubling trick.


title:
Integral equation approach for the numerical solution of a Robin problem
  for the Klein-Gordon equation in a doubly connected domain

abstract:
  In this paper we consider a Robin problem for the Klein-Gordon equation in a
doubly connected domain. The solution domain considered is a bounded smooth
doubly connected planar domain bounded by two simple disjoint closed curves.
The analysis of the problem is based on the indirect integral equations method.
The solution is represented as a sum of two single-layer potentials defined on
each of the two boundary curves with unknown densities. To find out the
densities the representation is matched with the given Robin data to generate a
system of linear integral equations of the second kind with continuous and
weakly-singular kernels. It is shown that the operator corresponding to this
system is injective and due to its compactness according to Riesz theory there
exists a unique solution. To discretize the system we apply Nystrom method with
a specifically chosen quadrature rules to obtain an exponential order of
convergence of the approximate solution. Numerical experiments are conducted
for three testing examples that back up the theoretical reasoning.


title:
Quantum teleportation from a telecom-wavelength photon to a solid-state
  quantum memory

abstract:
  In quantum teleportation, the state of a single quantum system is disembodied
into classical information and purely quantum correlations, to be later
reconstructed onto a second system that has never directly interacted with the
first one. This counterintuitive phenomenon is a cornerstone of quantum
information science due to its essential role in several important tasks such
as the long-distance transmission of quantum information using quantum
repeaters. In this context, a challenge of paramount importance is the
distribution of entanglement between remote nodes, and to use this entanglement
as a resource for long-distance light-to-matter quantum teleportation. Here we
demonstrate quantum teleportation of the polarization state of a
telecom-wavelength photon onto the state of a solid-state quantum memory.
Entanglement is established between a rare-earth-ion doped crystal storing a
single photon that is polarization-entangled with a flying telecom-wavelength
photon. The latter is jointly measured with another flying qubit carrying the
polarization state to be teleported, which heralds the teleportation. The
fidelity of the polarization state of the photon retrieved from the memory is
shown to be greater than the maximum fidelity achievable without entanglement,
even when the combined distances travelled by the two flying qubits is 25 km of
standard optical fibre. This light-to-matter teleportation channel paves the
way towards long-distance implementations of quantum networks with solid-state
quantum memories.