title:
Gaussian process regression can turn non-uniform and undersampled
  diffusion MRI data into diffusion spectrum imaging

abstract:
  We propose to use Gaussian process regression to accurately estimate the
diffusion MRI signal at arbitrary locations in q-space. By estimating the
signal on a grid, we can do synthetic diffusion spectrum imaging:
reconstructing the ensemble averaged propagator (EAP) by an inverse Fourier
transform. We also propose an alternative reconstruction method guaranteeing a
nonnegative EAP that integrates to unity. The reconstruction is validated on
data simulated from two Gaussians at various crossing angles. Moreover, we
demonstrate on non-uniformly sampled in vivo data that the method is far
superior to linear interpolation, and allows a drastic undersampling of the
data with only a minor loss of accuracy. We envision the method as a potential
replacement for standard diffusion spectrum imaging, in particular when
acquistion time is limited.


title: No overdensity of Lyman Alpha Emitting Galaxies around a quasar at z~5.7

abstract:
  Bright quasars, observed when the Universe was less than one billion years
old (z>5.5), are known to host massive black holes (~10$^{9}$ M$_{\odot}$), and
are thought to reside in the center of massive dark matter overdensities. In
this picture, overdensities of galaxies are expected around high redshift
quasars. However, observations based on the detection of Lyman Break Galaxies
(LBGs) around these quasars do not offer a clear picture: this may be due to
the uncertain redshift constraints of LBGs, which are selected through
broad-band filters only. To circumvent such uncertainties, we here perform a
search for Lyman Alpha Emitting galaxies (LAEs) in the field of the quasar PSO
J215.1512-16.0417 at z~5.73, through narrow band, deep imaging with FORS2 at
the VLT. We study an area of 37 arcmin$^{2}$, i.e. ~206 comoving Mpc$^{2}$ at
the redshift of the quasar. We find no evidence for an overdensity of LAEs in
the quasar field with respect to blank field studies. Possible explanations for
these findings include that our survey volume is too small, or that the strong
ionizing radiation from the quasar hinders galaxy formation in its immediate
proximity. Another possibility is that these quasars are not situated in the
dense environments predicted by some simulations.


title:
Refined universal laws for hull volumes and perimeters in large planar
  maps

abstract:
  We consider ensembles of planar maps with two marked vertices at distance k
from each other and look at the closed line separating these vertices and lying
at distance d from the first one (d<k). This line divides the map into two
components, the hull at distance d which corresponds to the part of the map
lying on the same side as the first vertex and its complementary. The number of
faces within the hull is called the hull volume and the length of the
separating line the hull perimeter. We study the statistics of the hull volume
and perimeter for arbitrary d and k in the limit of infinitely large planar
quadrangulations, triangulations and Eulerian triangulations. We consider more
precisely situations where both d and k become large with the ratio d/k
remaining finite. For infinitely large maps, two regimes may be encountered:
either the hull has a finite volume and its complementary is infinitely large,
or the hull itself has an infinite volume and its complementary is of finite
size. We compute the probability for the map to be in either regime as a
function of d/k as well as a number of universal statistical laws for the hull
perimeter and volume when maps are conditioned to be in one regime or the
other.


title: Inner crust of neutron stars with mass-fitted Skyrme interaction

abstract:
  The mass, radius and crustal fraction of moment of inertia in neutron stars
are calculated using $\beta$-equilibrated nuclear matter obtained from Skyrme
effective interaction. The transition density, pressure and proton fraction at
the inner edge separating the liquid core from the solid crust of the neutron
stars are determined from the thermodynamic stability conditions using the
KDE0v1 set. The neutron star masses obtained by solving the
Tolman-Oppenheimer-Volkoff equations using neutron star matter obtained from
this set is able to describe highly massive compact stars $\sim$2$M_{\odot}$.
The crustal fraction of the moment of inertia can be extracted from studying
pulsar glitches. This fraction is highly dependent on the core-crust transition
pressure and corresponding density. These results for pressure and density at
core-crust transition together with the observed minimum crustal fraction of
the total moment of inertia provide a limit for the radius of the Vela
pulsar:$R\geq$ 3.69+3.44 M/$M_{\odot}$. Present calculations suggest that the
crustal fraction of the total moment of inertia can be at most 3.6% due to
crustal entrainment caused by Bragg reflection of unbound neutrons by lattice
ions.


title: Radio and infrared study of the star forming region IRAS 20286+4105

abstract:
  A multi-wavelength investigation of the star forming complex IRAS 20286+4105,
located in the Cygnus-X region, is presented here. Near-infrared K-band data is
used to revisit the cluster / stellar group identified in previous studies. The
radio continuum observations, at 610 and 1280 MHz show the presence of a HII
region possibly powered by a star of spectral type B0 - B0.5. The cometary
morphology of the ionized region is explained by invoking the bow-shock model
where the likely association with a nearby supernova remnant is also explored.
A compact radio knot with non-thermal spectral index is detected towards the
centre of the cloud. Mid-infrared data from the Spitzer Legacy Survey of the
Cygnus-X region show the presence of six Class I YSOs inside the cloud. Thermal
dust emission in this complex is modelled using Herschel far-infrared data to
generate dust temperature and column density maps. Herschel images also show
the presence of two clumps in this region, the masses of which are estimated to
be {\sim} 175 M{\sun} and 30 M{\sun}. The mass-radius relation and the surface
density of the clumps do not qualify them as massive star forming sites. An
overall picture of a runaway star ionizing the cloud and a triggered population
of intermediate-mass, Class I sources located toward the cloud centre emerges
from this multiwavelength study. Variation in the dust emissivity spectral
index is shown to exist in this region and is seen to have an inverse relation
with the dust temperature.


title: Asymptotic properties of parallel Bayesian kernel density estimators

abstract:
  In this article we perform an asymptotic analysis of Bayesian parallel kernel
density estimators introduced by Neiswanger, Wang and Xing (2014). We derive
the asymptotic expansion of the mean integrated squared error for the full data
posterior estimator and investigate the properties of asymptotically optimal
bandwidth parameters. Our analysis demonstrates that partitioning data into
subsets requires a non-trivial choice of bandwidth parameters that optimizes
the estimation error.


title: On the Content Security Policy Violations due to the Same-Origin Policy

abstract:
  Modern browsers implement different security policies such as the Content
Security Policy (CSP), a mechanism designed to mitigate popular web
vulnerabilities, and the Same Origin Policy (SOP), a mechanism that governs
interactions between resources of web pages. In this work, we describe how CSP
may be violated due to the SOP when a page contains an embedded iframe from the
same origin. We analyse 1 million pages from 10,000 top Alexa sites and report
that at least 31.1% of current CSP-enabled pages are potentially vulnerable to
CSP violations. Further considering real-world situations where those pages are
involved in same-origin nested browsing contexts, we found that in at least
23.5% of the cases, CSP violations are possible. During our study, we also
identified a divergence among browsers implementations in the enforcement of
CSP in srcdoc sandboxed iframes, which actually reveals a problem in
Gecko-based browsers CSP implementation. To ameliorate the problematic
conflicts of the security mechanisms, we discuss measures to avoid CSP
violations.


title:
A very dark stellar system lost in Virgo: kinematics and metallicity of
  SECCO1 with MUSE

abstract:
  We present the results of VLT-MUSE integral field spectroscopy of SECCO1, a
faint, star-forming stellar system recently discovered as the stellar
counterpart of an Ultra Compact High Velocity Cloud (HVC274.68+74.0), very
likely residing within a substructure of the Virgo cluster of galaxies. We have
obtained the radial velocity of a total of 38 individual compact sources
identified as HII regions in the main and secondary body of the system, and
derived the metallicity for 18 of them. We provide the first direct
demonstration that the two stellar bodies of SECCO1 are physically associated
and that their velocities match the HI velocities. The metallicity is quite
uniform over the whole system, with a dispersion sigma_12+log(O/H/)=0.08, lower
than the uncertainty on individual metallicity estimates. The mean abundance,
12+log(O/H)=8.44, is much higher than the typical values for local dwarf
galaxies of similar stellar mass. This strongly suggests that the SECCO~1 stars
were born from a pre-enriched gas cloud, possibly stripped from a larger
galaxy. Using archival HST images we derive a total stellar mass of ~1.6 X 10^5
M_sun for SECCO1, confirming that it has a very high HI to stellar mass ratio
for a dwarf galaxy, M_HI/M_*~ 100. The star formation rate, derived from the
H_alpha flux is a factor of more than 10 higher than in typical dwarf galaxies
of similar luminosity.


title:
Disentangling wrong-way risk: pricing CVA via change of measures and
  drift adjustment

abstract:
  A key driver of Credit Value Adjustment (CVA) is the possible dependency
between exposure and counterparty credit risk, known as Wrong-Way Risk (WWR).
At this time, addressing WWR in a both sound and tractable way remains
challenging: arbitrage-free setups have been proposed by academic research
through dynamic models but are computationally intensive and hard to use in
practice. Tractable alternatives based on resampling techniques have been
proposed by the industry, but they lack mathematical foundations. This probably
explains why WWR is not explicitly handled in the Basel III regulatory
framework in spite of its acknowledged importance. The purpose of this paper is
to propose a new method consisting of an appealing compromise: we start from a
stochastic intensity approach and end up with a pricing problem where WWR does
not enter the picture explicitly. This result is achieved thanks to a set of
changes of measure: the WWR effect is now embedded in the drift of the
exposure, and this adjustment can be approximated by a deterministic function
without affecting the level of accuracy typically required for CVA figures. The
performances of our approach are illustrated through an extensive comparison of
Expected Positive Exposure (EPE) profiles and CVA figures produced either by
(i) the standard method relying on a full bivariate Monte Carlo framework and
(ii) our drift-adjustment approximation. Given the uncertainty inherent to CVA,
the proposed method is believed to provide a promising way to handle WWR in a
sound and tractable way.


title: Computing tropical points and tropical links

abstract:
  We present an algorithm for computing zero-dimensional tropical varieties
based on triangular decomposition and Newton polygon methods. From it, we
derive algorithms for computing points on and links of higher-dimensional
tropical varieties, using intersections with affine hyperplanes to reduce the
dimension to zero. We use the algorithms to show that the tropical
Grassmannians $\mathcal G_{3,8}$ and $\mathcal G_{4,8}$ are not simplicial.


title: Audio Visual Speech Recognition using Deep Recurrent Neural Networks

abstract:
  In this work, we propose a training algorithm for an audio-visual automatic
speech recognition (AV-ASR) system using deep recurrent neural network
(RNN).First, we train a deep RNN acoustic model with a Connectionist Temporal
Classification (CTC) objective function. The frame labels obtained from the
acoustic model are then used to perform a non-linear dimensionality reduction
of the visual features using a deep bottleneck network. Audio and visual
features are fused and used to train a fusion RNN. The use of bottleneck
features for visual modality helps the model to converge properly during
training. Our system is evaluated on GRID corpus. Our results show that
presence of visual modality gives significant improvement in character error
rate (CER) at various levels of noise even when the model is trained without
noisy data. We also provide a comparison of two fusion methods: feature fusion
and decision fusion.


title: Random lattice vectors in a set of size O(n)

abstract:
  We adopt the sieve ideas of Schmidt and S\"odergren in order to study the
statistics of vectors of a random lattice of dimension n contained in a set of
volume O(n). We also give some sporadic applications of our results to number
theory.


title:
Statistical Assessment of PLC Networking for Front-Hauling in Small
  Radio Cells

abstract:
  The employment of power lines for communications (PLC) has been theorized
almost a century ago; although the physical medium is not meant for data
transmission, recent technical developments pushed the capacity boundary much
higher than expected, allowing to consider PLC for new applications as the one
considered in this contribution, i.e., as a solution for small cell
back/front-hauling. In principle, back-hauling for cellular networks via PLC is
very attractive given how pervasive the power line infrastructure is. Telecom
operators are looking for solutions that can handle the traffic increase which
is doublying every year. This calls for improvements of both cellular systems
and front-hauling technologies that have to bridge the radio network with the
core network. Small cells are currently advocated as the solution to spatially
fragment the network and offer high capacity in densely populated areas; this
is also due to the availability of spectrum at high frequency (mmWave links)
which inherently offers large bandwidth but forces the cells to become smaller
due to the short distance coverage. Therefore, it appears that mobile operators
may eventually have to deploy an order of magnitude more (small) cells compared
to existing networks having macro cells. This translates in a high density
cellular network that poses more challenges for the back-haul.


title:
Particle-in-cell Simulations of Global Relativistic Jets with Helical
  Magnetic Fields

abstract:
  We study the interaction of relativistic jets with their environment, using
3-dimensional relativistic particle-in-cell simulations for two cases of jet
composition: (i) electron-proton ($e^{-}-p^{+}$) and (ii) electron-positron
($e^{\pm}$) plasmas containing helical magnetic fields. We have performed
simulations of "global" jets containing helical magnetic fields in order to
examine how helical magnetic fields affect kinetic instabilities such as the
Weibel instability, the kinetic Kelvin-Helmholtz instability and the Mushroom
instability. We have found that these kinetic instabilities are suppressed and
new types of instabilities can grow. For the $e^{-}-p^{+}$ jet, a
recollimation-like instability occurs and jet electrons are strongly perturbed,
whereas for the $e^{\pm}$ jet, a recollimation-like instability occurs at early
times followed by kinetic instability and the general structure is similar to a
simulation without a helical magnetic field. We plan to perform further
simulations using much larger systems to confirm these new findings.


title:
On The Effective Construction of Asymmetric Chudnovsky Multiplication
  Algorithms in Finite Fields Without Derivated Evaluation

abstract:
  The Chudnovsky and Chudnovsky algorithm for the multiplication in extensions
of finite fields provides a bilinear complexity which is uniformly linear whith
respect to the degree of the extension. Recently, Randriambololona has
generalized the method, allowing asymmetry in the interpolation procedure and
leading to new upper bounds on the bilinear complexity. We describe the
effective algorithm of this asymmetric method, without derivated evaluation.
Finally, we give examples with the finite field $\F_{16^{13}}$ using only
rational places, $\F_{4^{13}}$ using also places of degree two and
$\F_{2^{13}}$ using also places of degree four.


title:
Perturbational treatment of spin-orbit coupling for generally applicable
  high-level multi-reference methods

abstract:
  An efficient perturbational treatment of spin-orbit coupling within the
framework of high-level multi-reference techniques has been implemented in the
most recent version of the COLUMBUS quantum chemistry package, extending the
existing fully variational two-component (2c) multi-reference configuration
interaction singles and doubles (MRCISD) method. The proposed scheme follows
related implementations of quasi-degenerate perturbation theory (QDPT) model
space techniques. Our model space is built either from uncontracted,
large-scale scalar relativistic MRCISD wavefunctions or based on the
scalar-relativistic solutions of the linear-response-theory-based
multi-configurational averaged quadratic coupled cluster method (LRT-MRAQCC).
The latter approach allows for a consistent, approximatively size-consistent
and size-extensive treatment of spin-orbit coupling. The approach is described
in detail and compared to a number of related techniques. The inherent accuracy
of the QDPT approach is validated by comparing cuts of the potential energy
surfaces of acrolein and its S, Se, and Te analoga with the corresponding data
obtained from matching fully variational spin-orbit MRCISD calculations. The
conceptual availability of approximate analytic gradients with respect to
geometrical displacements is an attractive feature of the 2c-QDPT-MRCISD and
2c-QDPT-LRT-MRAQCC methods for structure optimization and ab inito molecular
dynamics simulations.


title:
Encoding monotonic multi-set preferences using CI-nets: preliminary
  report

abstract:
  CP-nets and their variants constitute one of the main AI approaches for
specifying and reasoning about preferences. CI-nets, in particular, are a
CP-inspired formalism for representing ordinal preferences over sets of goods,
which are typically required to be monotonic.
  Considering also that goods often come in multi-sets rather than sets, a
natural question is whether CI-nets can be used more or less directly to encode
preferences over multi-sets. We here provide some initial ideas on how to
achieve this, in the sense that at least a restricted form of reasoning on our
framework, which we call "confined reasoning", can be efficiently reduced to
reasoning on CI-nets. Our framework nevertheless allows for encoding
preferences over multi-sets with unbounded multiplicities. We also show the
extent to which it can be used to represent preferences where multiplicites of
the goods are not stated explicitly ("purely qualitative preferences") as well
as a potential use of our generalization of CI-nets as a component of a recent
system for evidence aggregation.


title:
Node-Adapt, Path-Adapt and Tree-Adapt:Model-Transfer Domain Adaptation
  for Random Forest

abstract:
  Random Forest (RF) is a successful paradigm for learning classifiers due to
its ability to learn from large feature spaces and seamlessly integrate
multi-class classification, as well as the achieved accuracy and processing
efficiency. However, as many other classifiers, RF requires domain adaptation
(DA) provided that there is a mismatch between the training (source) and
testing (target) domains which provokes classification degradation.
Consequently, different RF-DA methods have been proposed, which not only
require target-domain samples but revisiting the source-domain ones, too. As
novelty, we propose three inherently different methods (Node-Adapt, Path-Adapt
and Tree-Adapt) that only require the learned source-domain RF and a relatively
few target-domain samples for DA, i.e. source-domain samples do not need to be
available. To assess the performance of our proposals we focus on image-based
object detection, using the pedestrian detection problem as challenging
proof-of-concept. Moreover, we use the RF with expert nodes because it is a
competitive patch-based pedestrian model. We test our Node-, Path- and
Tree-Adapt methods in standard benchmarks, showing that DA is largely achieved.


title: A Systematic X-ray Study of the Dwarf Novae Observed with Suzaku

abstract:
  X-ray behavior of the dwarf novae (DNe) outside the quiescent state has not
been fully understood. We thus assembled 21 data sets of the 15 DNe observed by
the Suzaku satellite by the end of 2013, which include spectra taken during not
only the quiescence, but also the transitional, outburst, and super-outburst
states. Starting with the traditional cooling flow model to explain the X-ray
emission from the boundary layer, we made several modifications to account for
the observed spectra. As a result, we found that the best-fit spectral model
depends strongly on the state of the DNe with only a few exceptions. Spectra in
the quiescent state are explained by the cooling flow model plus a Fe
fluorescent line emission attenuated by an interstellar extinction. Spectra in
the transitional state require an additional partial covering extinction.
Spectra in the outburst and super-outburst state require additional
low-temperature thin-thermal plasma component(s). Spectra in the super-outburst
state further require a high value of the minimum temperature of the boundary
layer. We present an interpretation on the required modifications to the
cooling flow model for each state.


title:
Stability of fully discrete variational schemes for elastodynamics with
  a polyconvex stored energy

abstract:
  In this article we develop a fully discrete variational scheme that
approximates the equations of three dimensional elastodynamics with polyconvex
stored energy. The fully discrete scheme is based on a time-discrete
variational scheme developed by S.~Demoulini, D.~M.~A.~Stuart and
A.~E.~Tzavaras (2001). We show that the fully discrete scheme is
unconditionally stable. The proof of stability is based on a relative entropy
estimation for the fully discrete approximates.


title: Hierarchies of sum rules for squares of spherical Bessel functions

abstract:
  A four-term recurrence relation for squared spherical Bessel functions is
shown to yield closed-form expressions for several types of finite weighted
sums of these functions. The resulting sum rules, which may contain an
arbitrarily large number of terms, are found to constitute three independent
hierarchies. Their use leads to an efficient numerical evaluation of these
sums.


title:
A challenging view of the 2015 summer V404 Cyg outburst at high energy
  with INTEGRAL/SPI: The finale

abstract:
  During its strong outburst of 2015 June/July, the X-ray transient V404 Cygni
(= GS2023+338) was observed up to a level of 50 Crab in the hard X-ray domain.
We focus here on a particularly intense episode preceeding a definitive decline
of the source activity. We benefit from large signal-to-noise ratios to
investigate the source spectral variability on a timescale of 5 minutes. A
Hardness-Intensity study of three broad bands reveals clearly different
behaviors at low and high energy (below and above around 100 keV). In
particular, on two occasions, the source intensity varies by a factor of 3-4 in
amplitude while keeping the same spectral shape. On the other hand, at the end
of the major flare, the emission presents a clear anticorrelation between flux
and hardness. These behaviors strongly suggest the presence of two spectral
components related to emission processes varying in a largely independent way.
The first component (E < 100-150 keV) is classically identified with a
Comptonizing thermal electron population and requires either an unusual seed
photon population or a specific geometry with strong absorbing/reflecting
material. The second component is modeled by a cutoff power-law, which could
correspond to a second hotter Comptonizing population or another mechanism
(synchrotron, non-thermal Comptonization...). In the framework of such a model,
Hardness-Intensity and Flux-Flux diagrams clearly demonstrate that the source
evolution follows a well organized underlying scheme. They reveal unique
information about the Hard X-ray emission processes and connections between
them.


title: Tight Lower Bounds for the Longest Common Extension Problem

abstract:
  The longest common extension problem is to preprocess a given string of
length $n$ into a data structure that uses $S(n)$ bits on top of the input and
answers in $T(n)$ time the queries $\mathit{LCE}(i,j)$ computing the length of
the longest string that occurs at both positions $i$ and $j$ in the input. We
prove that the trade-off $S(n)T(n) = \Omega(n\log n)$ holds in the non-uniform
cell-probe model provided that the input string is read-only, each letter
occupies a separate memory cell, $S(n) = \Omega(n)$, and the size of the input
alphabet is at least $2^{8\lceil S(n) / n\rceil}$. It is known that this
trade-off is tight.


title: Field induced suppression of charge density wave in GdNiC$_2$

abstract:
  We report the specific heat, magnetic, magnetotransport and galvanomagnetic
properties of polycrystalline GdNiC$_2$. In the intermediate temperature region
above $T_N$ = 20 K, we observe large negative magnetoresistance due to Zeeman
splitting of the electronic bands and partial destruction of a charge density
wave ground state. Our magnetoresistance and Hall measurements show that at low
temperatures a magnetic field induced transformation from antiferromagnetic
order to a metamagnetic phase results in the partial suppression of the CDW.


title: Gamma-rays from $^{nat}$Sn and $^{nat}$C induced by fast neutrons

abstract:
  The cross-sections of prompt gamma-ray production from $^{nat}$Sn and
$^{nat}$C elements induced by 14.1-MeV neutrons were measured. The
time-of-flight technique was used for n-gamma discrimination. The experimental
results were compared with theoretical calculations performed by Empire 3.2 and
Talys 1.6 codes using different models for photon strength function and nuclear
level density.


title:
Optical Valley Hall Effect based on Transitional Metal Dichalcogenide
  cavity polaritons

abstract:
  We calculate the dispersion of spinor exciton-polaritons in a planar
microcavity with its active region containing a single Transitional Metal
Dichalcogenide (TMD) monolayer, taking into account excitonic and photonic
spin-orbit coupling. We consider the radial propagation of polaritons in
presence of disorder. We show that the reduction of the disorder scattering
induced by the formation of polariton states allows to observe an optical
Valley Hall effect, namely the coherent precession of the locked valley and
polarization pseudospins leading to the formation of spatial valley-polarized
domains.


title: A stabilized Nitsche cut finite element method for the Oseen problem

abstract:
  We propose a stabilized Nitsche-based cut finite element formulation for the
Oseen problem in which the boundary of the domain is allowed to cut through the
elements of an easy-to-generate background mesh. Our formulation is based on
the continuous interior penalty (CIP) method of Burman et al. [1] which
penalizes jumps of velocity and pressure gradients over inter-element faces to
counteract instabilities arising for high local Reynolds numbers and the use of
equal order interpolation spaces for the velocity and pressure. Since the mesh
does not fit the boundary, Dirichlet boundary conditions are imposed weakly by
a stabilized Nitsche-type approach. The addition of CIP-like ghost-penalties in
the boundary zone allows to prove that our method is inf-sup stable and to
derive optimal order a priori error estimates in an energy-type norm,
irrespective of how the boundary cuts the underlying mesh. All applied
stabilization techniques are developed with particular emphasis on low and high
Reynolds numbers. Two- and three-dimensional numerical examples corroborate the
theoretical findings. Finally, the proposed method is applied to solve the
transient incompressible Navier-Stokes equations on a complex geometry.


title: Hidden Criticality of Counterion Condensation Near a Charged Cylinder

abstract:
  We study the condensation transition of counterions on a charged cylinder via
Monte Carlo simulations. Varying the cylinder radius systematically in relation
to the system size, we find that all counterions are bound to the cylinder and
the heat capacity shows a drop at a finite Manning parameter. A finite-size
scaling analysis is carried out to confirm the criticality of the complete
condensation transition, yielding the same critical exponents with the Manning
transition. We show that the existence of the complete condensation is
essential to explain how the condensation nature alters from continuous to
discontinuous transition.


title: Abundances in the Local Region II: F, G and K Dwarfs and Subgiants

abstract:
  Parameters and abundances for 1002 stars of spectral types F, G, and K of
luminosity class IV and V have been derived. After culling the sample for
rotational velocity and effective temperature, 867 stars remain for discussion.
  Twenty-eight elements are considered in the analysis. The {\alpha},
iron-peak, and Period 5 transition metal abundances for these stars show a
modest enhancement over solar averaging about 0.05 dex. The lanthanides are
more abundant averaging about +0.2 dex over solar. The question is: Are these
stars enhanced or is the Sun somewhat metal-poor relative to these stars? The
consistency of the abundances derived here argues for the latter view.
  Lithium, carbon, and oxygen abundances have been derived. The stars show the
usual lithium astration as a function of mass / temperature. There are more
than 100 planet-hosts in the sample, and there is no discernible difference in
their lithium content relative to the remaining stars. The carbon and oxygen
abundances show the well-known trend of decreasing [x/Fe] ratio with increasing
[Fe/H].


title:
Short-Time Dynamics of the Three-Dimensional Fully Frustrated Ising
  Model

abstract:
  The critical relaxation from the low-temperature ordered state of the
three-dimensional fully frustrated Ising model on a simple cubic lattice has
been studied using the short time dynamics method. Particles with the periodic
boundary conditions containing N = 262144 spins have been studied. Calculations
have been performed by the standard Metropolis Monte Carlo algorithm. The
static critical exponents of the magnetization and correlation radius have been
obtained. The dynamic critical exponent of the model under study has been
calculated.


title: Lagrangian Controllability of the 1-D Korteweg-de Vries Equation

abstract:
  We consider in this paper the problem of the Lagrangian controllability for
the Korteweg-de Vries equation. Using the $N$-solitons solution, we prove that,
for any length of the spatial domain $L>0$ and any time $T>0$, it is possible
to choose appropriate boundary controls of KdV equation such that the flow
associated to this solution exit the domain in time $T$.


title:
Entanglement Pre-thermalization in an Interaction Quench between Two
  Harmonic Oscillators

abstract:
  Entanglement pre-thermalization (EP) is a quasi-stationary nonequilibrium
state of a composite system in which each individual subsystem looks thermal
but the entire system remains nonthermal due to quantum entanglement between
subsystems. We theoretically study the dynamics of EP following a coherent
split of a one-dimensional harmonic potential in which two interacting bosons
are confined. This problem is equivalent to that of an interaction quench
between two harmonic oscillators. We show that this simple model captures the
bare essentials of EP; that is, each subsystem relaxes to an approximate
thermal equilibrium, whereas the total system remains entangled. We find that a
generalized Gibbs ensemble, which incorporates nonlocal conserved quantities,
exactly describes the total system. In the presence of a symmetry-breaking
perturbation, EP is quasi-stationary and eventually reaches thermal
equilibrium. We analytically show that the lifetime of EP is inversely
proportional to the magnitude of the perturbation.


title: Bipartite graphs and their dessins d'enfants

abstract:
  Each finite and connected bipartite graph induces a finite collection of
non-isomorphic dessins d'enfants, that is, $2$-cell embeddings of it into some
closed orientable surface. We describe an algorithm to compute all these
dessins d'enfants, together their automorphims group, monodromy group and
duality type.


title: A regular equilibrium solves the extended HJB system

abstract:
  Control problems not admitting the dynamic programming principle are known as
time-inconsistent. The game-theoretic approach is to interpret such problems as
intrapersonal dynamic games and look for subgame perfect Nash equilibria. A
fundamental result of time-inconsistent stochastic control is a verification
theorem saying that solving the extended HJB system is a sufficient condition
for equilibrium. We show that solving the extended HJB system is a necessary
condition for equilibrium, under regularity assumptions. The controlled process
is a general It\^o diffusion.


title: Extending the ergodic convergence rate of the proximal ADMM

abstract:
  Pointwise and ergodic iteration-complexity results for the proximal
alternating direction method of multipliers (ADMM) for any stepsize
in(0,(1+\sqrt{5})/2) have been recently established in the literature. In
addition to giving alternative proofs of these results, this paper also extends
the ergodic iteration-complexity result to include the case in which the
stepsize is equal to (1+\sqrt{5})/$. As far as we know, this is the first
ergodic iteration-complexity for the stepsize (1+\sqrt{5})/2 obtained in the
ADMM literature. These results are obtained by showing that the proximal ADMM
is an instance of a non-Euclidean hybrid proximal extragradient framework whose
pointwise and ergodic convergence rate are also studied.


title:
A magnetohydrodynamic model for multi-wavelength flares from
  Sagittarius~A$^\star$ (I): model and the near-infrared and X-ray flares

abstract:
  Flares from the supermassive black hole in our Galaxy, Sagittarius~A$^\star$
(Sgr A$^\star$), are routinely observed over the last decade or so. Despite
numerous observational and theoretical efforts, the nature of such flares still
remains poorly understood, although a few phenomenological scenarios have been
proposed. In this work, we develop the Yuan et al. (2009) scenario into a
magnetohydrodynamic (MHD) model for Sgr A$^\star$ flares. This model is
analogous with the theory of solar flares and coronal mass ejection in solar
physics. In the model, magnetic field loops emerge from the accretion flow onto
Sgr A$^\star$ and are twisted to form flux ropes because of shear and
turbulence. The magnetic energy is also accumulated in this process until a
threshold is reached. This then results in a catastrophic evolution of a flux
rope with the help of magnetic reconnection in the current sheet. In this
catastrophic process, the magnetic energy is partially converted into the
energy of non-thermal electrons. We have quantitatively calculated the
dynamical evolution of the height, size, and velocity of the flux rope, as well
as the magnetic field in the flare regions, and the energy distribution of
relativistic electrons in this process. We further calculate the synchrotron
radiation from these electrons and compare the obtained light curves with the
observed ones. We find that the model can reasonably explain the main
observations of near-infrared (NIR) and X-ray flares including their light
curves and spectra. It can also potentially explain the frequency-dependent
time delay seen in radio flare light curves.


title: Helping HPC Users Specify Job Memory Requirements via Machine Learning

abstract:
  Resource allocation in High Performance Computing (HPC) settings is still not
easy for end-users due to the wide variety of application and environment
configuration options. Users have difficulties to estimate the number of
processors and amount of memory required by their jobs, select the queue and
partition, and estimate when job output will be available to plan for next
experiments. Apart from wasting infrastructure resources by making wrong
allocation decisions, overall user response time can also be negatively
impacted. Techniques that exploit batch scheduler systems to predict waiting
time and runtime of user jobs have already been proposed. However, we observed
that such techniques are not suitable for predicting job memory usage. In this
paper we introduce a tool to help users predict their memory requirements using
machine learning. We describe the integration of the tool with a batch
scheduler system, discuss how batch scheduler log data can be exploited to
generate memory usage predictions through machine learning, and present results
of two production systems containing thousands of jobs.


title:
Classical field theories from Hamiltonian constraint: Local symmetries
  and static gauge fields

abstract:
  We consider the Hamiltonian constraint formulation of classical field
theories, which treats spacetime and the space of fields symmetrically, and
utilizes the concept of momentum multivector. The gauge field is introduced to
compensate for non-invariance of the Hamiltonian under local transformations.
It is a position-dependent linear mapping, which couples to the Hamiltonian by
acting on the momentum multivector. We investigate symmetries of the ensuing
gauged Hamiltonian, and propose a generic form of the gauge field strength. In
examples we show how a generic gauge field can be specialized in order to
realize gravitational and/or Yang-Mills interaction. Gauge field dynamics is
not discussed in this article. Throughout, we employ the mathematical language
of geometric algebra and calculus.


title:
Measurement of the $^{232}$Th (n, $\gamma$ )/$^{58}$Ni (n, p) reaction
  rate ratio in the leakage neutron field of CFBR-II fast burst reactor

abstract:
  A ThO$_{2}$ sample and a nickel activation foil were irradiated in the
leakage neutron field of CFBR-II reactor. The activities of the activation
products were measured after irradiation to obtain the reaction rates. The
normalized reaction rates were also calculated based on the ENDF/B-VII.1,
CENDL-3.1, JENDL-4.0, BROND-2.2 databases. The experimental reaction rate ratio
is 4.37 with an uncertainty of 3.9\% which is coincident with each of the
ratios calculated based on the ENDFB-VII. 1, JENDL-4.0, BROND-2.2 databases,
but is 11.2\% larger than that based on CENDL-3.1 database.


title: Coming to Terms with Quantified Reasoning

abstract:
  The theory of finite term algebras provides a natural framework to describe
the semantics of functional languages. The ability to efficiently reason about
term algebras is essential to automate program analysis and verification for
functional or imperative programs over algebraic data types such as lists and
trees. However, as the theory of finite term algebras is not finitely
axiomatizable, reasoning about quantified properties over term algebras is
challenging.
  In this paper we address full first-order reasoning about properties of
programs manipulating term algebras, and describe two approaches for doing so
by using first-order theorem proving. Our first method is a conservative
extension of the theory of term algebras using a finite number of statements,
while our second method relies on extending the superposition calculus of
first-order theorem provers with additional inference rules.
  We implemented our work in the first-order theorem prover Vampire and
evaluated it on a large number of algebraic data type benchmarks, as well as
game theory constraints. Our experimental results show that our methods are
able to find proofs for many hard problems previously unsolved by
state-of-the-art methods. We also show that Vampire implementing our methods
outperforms existing SMT solvers able to deal with algebraic data types.


title:
On the study of a class of non-linear differential equations on compact
  Riemannian Manifolds

abstract:
  We study the existence of solutions of the non-linear differential equations
on the compact Riemannian manifolds $(M^n,g), n\geq 2$, \Delta_p u +
a(x)u^{p-1} = \lambda f(u,x), (E2) where $\Delta_p$ is the $p-$laplacian, with
$1<p<n$. The equation (E2) generalizes a equation considered by Aubin, where he
has considered, a compact Riemannian manifold $(M,g)$, the differential
equation ($p=2$) \Delta u + a(x)u = \lambda f(u,x), (E1) where $a(x)$ is a
$C^{\infty}$ function defined on $M$ and $f(u,x)$ is a $C^{\infty}$ function
defined on $\mathbb{R}\times M$. We show that the equation (E2) has solution
$(\lambda,u)$, where $\lambda \in \mathbb{R}$, $u \geq 0$, $u \not\equiv 0$ is
a function $C^{1,\alpha}$, $0 < \alpha < 1$, if $f \in C^{\infty}$ satisfies
some growth and parity conditions.


title: Heritability estimation of diseases in case-control studies

abstract:
  In the field of genetics, the concept of heritability refers to the
proportion of variations of a biological trait or disease that can be explained
by genetic factors. Quantifying the heritability of a disease is a fundamental
challenge in human genetics, especially when the causes are plural and not
clearly identified. Although the literature regarding heritability estimation
for binary traits is less rich than for quantitative traits, several methods
have been proposed to estimate the heritability of complex diseases. However,
to the best of our knowledge, the existing methods are not supported by
theoretical grounds. Moreover, most of the methodologies do not take into
account a major specificity of the data coming from medical studies, which is
the oversampling of the number of patients compared to controls. We propose in
this paper to investigate the theoretical properties of the method developed by
Golan et al. (2014), which is very efficient in practice, despite the
oversampling of patients. Our main result is the proof of the consistency of
this estimator. We also provide a numerical study to compare two approximations
leading to two heritability estimators.


title: Maximising $H$-Colourings of Graphs

abstract:
  For graphs $G$ and $H$, an $H$-colouring of $G$ is a map
$\psi:V(G)\rightarrow V(H)$ such that $ij\in E(G)\Rightarrow\psi(i)\psi(j)\in
E(H)$. The number of $H$-colourings of $G$ is denoted by $\hom(G,H)$.
  We prove the following: for all graphs $H$ and $\delta\geq3$, there is a
constant $\kappa(\delta,H)$ such that, if $n\geq\kappa(\delta,H)$, the graph
$K_{\delta,n-\delta}$ maximises the number of $H$-colourings among all
connected graphs with $n$ vertices and minimum degree $\delta$. This answers a
question of Engbers.
  We also disprove a conjecture of Engbers on the graph $G$ that maximises the
number of $H$-colourings when the assumption of the connectivity of $G$ is
dropped.
  Finally, let $H$ be a graph with maximum degree $k$. We show that, if $H$
does not contain the complete looped graph on $k$ vertices or $K_{k,k}$ as a
component and $\delta\geq\delta_0(H)$, then the following holds: for $n$
sufficiently large, the graph $K_{\delta,n-\delta}$ maximises the number of
$H$-colourings among all graphs on $n$ vertices with minimum degree $\delta$.
This partially answers another question of Engbers.


title: Semiclassics, Goldstone Bosons and CFT data

abstract:
  Hellerman et al. (arXiv:1505.01537) have shown that in a generic CFT the
spectrum of operators carrying a large U(1) charge can be analyzed
semiclassically in an expansion in inverse powers of the charge. The key is the
operator state correspondence by which such operators are associated with a
finite density superfluid phase for the theory quantized on the cylinder. The
dynamics is dominated by the corresponding Goldstone hydrodynamic mode and the
derivative expansion coincides with the inverse charge expansion. We illustrate
and further clarify this situation by first considering simple quantum
mechanical analogues. We then systematize the approach by employing the coset
construction for non-linearly realized space-time symmetries. Focussing on CFT3
we illustrate the case of higher rank and non-abelian groups and the
computation of higher point functions. Three point function coefficients turn
out to satisfy universal scaling laws and correlations as the charge and spin
are varied.


title: The quartet ground state in CeB$_6$: an inelastic x-ray scattering study

abstract:
  We investigated the ground state symmetry of the cubic hidden order compound
CeB$_6$ by means of core level non-resonant inelastic x-ray scattering (NIXS).
The information is obtained from the directional dependence of the scattering
function that arises from higher than dipole transitions. Our new method
confirms that the ground state is well described using a localized
crystal-field model assuming a $\Gamma_8$ quartet ground state.


title: Reservoir engineering with ultracold Rydberg atoms

abstract:
  We apply reservoir engineering to construct a thermal environment with
controllable temperature in an ultracold atomic Rydberg system. A Boltzmann
distribution of the system's eigenstates is produced by optically driving a
small environment of ultracold atoms, which is coupled to a photonic continuum
through spontaneous emission. This technique provides a useful tool for quantum
simulation of dynamics coupled to a thermal environment. Additionally, we
demonstrate that pure eigenstates, such as Bell states, can be prepared in the
Rydberg atomic system using this method.


title: Power Gating Structure for Reversible Programmable Logic Array

abstract:
  Throughout the world, the numbers of researchers or hardware designer
struggle for the reducing of power dissipation in low power VLSI systems. This
paper presented an idea of using the power gating structure for reducing the
sub threshold leakage in the reversible system. This concept presented in the
paper is entirely new and presented in the literature of reversible logics. By
using the reversible logics for the digital systems, the energy can be saved up
to the gate level implementation. But at the physical level designing of the
reversible logics by the modern CMOS technology the heat or energy is
dissipated due the sub-threshold leakage at the time of inactivity or standby
mode. The Reversible Programming logic array (RPLA) is one of the important
parts of the low power industrial applications and in this paper the physical
design of the RPLA is presented by using the sleep transistor and the results
is shown with the help of TINA- PRO software. The results for the proposed
design is also compare with the CMOS design and shown that of 40.8% of energy
saving. The Transient response is also produces in the paper for the switching
activity and showing that the proposed design is much better that the modern
CMOS design of the RPLA.


title:
Bogolyubov inequality for the ground state and its application to
  interacting rotor systems

abstract:
  We have formulated and proved the Bogolyubov inequality for operators at zero
temperature. So far this inequality has been known for matrices, and we were
able to extend it to certain class of operators. We have also applied this
inequality to the system of interacting rotors. We have shown that if: {\em i)}
the dimension of the lattice is 1 or 2, {\em ii)} the interaction decreases
sufficiently fast with a distance, and {\em iii)} there is an energy gap over
the ground state, then the spontaneous magnetization in the ground state is
zero, i.e. there is no LRO in the system. We present also heuristic arguments
(of perturbation-theoretic nature) suggesting that one- and two-dimensional
system of interacting rotors has the energy gap independent of the system size
if the interaction is sufficiently small.


title:
SLA-aware Interactive Workflow Assistant for HPC Parameter Sweeping
  Experiments

abstract:
  A common workflow in science and engineering is to (i) setup and deploy large
experiments with tasks comprising an application and multiple parameter values;
(ii) generate intermediate results; (iii) analyze them; and (iv) reprioritize
the tasks. These steps are repeated until the desired goal is achieved, which
can be the evaluation/simulation of complex systems or model calibration. Due
to time and cost constraints, sweeping all possible parameter values of the
user application is not always feasible. Experimental Design techniques can
help users reorganize submission-execution-analysis workflows to bring a
solution in a more timely manner. This paper introduces a novel tool that
leverages users' feedback on analyzing intermediate results of parameter
sweeping experiments to advise them about their strategies on parameter
selections tied to their SLA constraints. We evaluated our tool with three
applications of distinct domains and search space shapes. Our main finding is
that users with submission-execution-analysis workflows can benefit from their
interaction with intermediate results and adapt themselves according to their
domain expertise and SLA constraints.


title: Minimum Spanning trees with Neighborhoods

abstract:
  This paper studies Minimum Spanning Trees under incomplete information for
its vertices. We assume that no information is available on the precise
placement of vertices so that it is only known that vertices belong to some
neighborhoods that are second order cone representable and distances are
measured with a $\ell_q$-norm. Two mixed integer non linear mathematical
programming formulations are presented, based on alternative representations of
subtour elimination constraints. A solution scheme is also proposed, resulting
from a reformulation suitable for a Benders-like decomposition, which is
embedded within an exact branch-and-cut framework. Furthermore, a mathheuristic
is developed, which alternates in solving convex subproblems in different
solution spaces, and is able to solve larger instances. The results of
extensive computational experiments are reported and analyzed.


title:
Ground states and semiclassical states of nonlinear Choquard equations
  involving Hardy-Littlewood-Sobolev critical growth

abstract:
  We are concerned with the existence of ground states for nonlinear Choquard
equations involving a critical nonlinearity in the sense of
Hardy-Littlewood-Sobolev. Our result complements previous results by Moroz and
Van Schaftingen where the subcritical case was considered. Then, we focus on
the existence of semi-classical states and by using a truncation argument
approach, we establish the existence and concentration of single peak solutions
concentrating around minima of the Schr\"odinger potential, as the Planck
constant goes to zero. The result is robust in the sense that the nonlinearity
is not required to satisfy monotonicity conditions nor the
Ambrosetti-Rabinowitz condition.


title:
Energy Efficient Barring Factor Enabled Extended Access Barring for IoT
  Devices in LTE-Advanced

abstract:
  Synchronized Random Access Channel (RACH) attempts by Internet of Things
(IoT) devices could result in Radio Access Network (RAN) overload in LTE-A.
3GPP adopted Barring Bitmap Enabled-Extended Access Barring (EAB-BB) mechanism
that announces the EAB information (i.e., a list of barred Access Classes)
through a barring bitmap as the baseline solution to mitigate the RAN overload.
EAB-BB was analyzed for its optimal performance in a recent work. However,
there has been no work that analyzes Barring Factor Enabled-Extended Access
Barring (EAB-BF), an alternative mechanism that was considered during the
standardization process. Due to the modeling complexity involved, not only has
it been difficult to analyze EAB-BF, but also, a much more far-reaching issue,
like the effect of these schemes on key network performance parameter, like
eNodeB energy consumption, has been overlooked. In this regard, for the first
time, we develop a novel analytical model for EAB-BF to obtain its performance
metrics. Results obtained from our analysis and simulation are seen to match
very well. Furthermore, we also build an eNodeB energy consumption model to
serve the IoT RACH requests. We then show that our analytical and energy
consumption models can be combined to obtain EAB-BF settings that can minimize
eNodeB energy consumption, while simultaneously providing optimal Quality of
Service (QoS) performance. Results obtained reveal that the optimal performance
of EAB-BF is better than that of EAB-BB. Furthermore, we also show that not
only all the three 3GPP-proposed EAB-BF settings considered during
standardization provide sub-optimal QoS to devices, but also result in
excessive eNodeB energy consumption, thereby acutely penalizing the network.
Finally, we provide corrections to these 3GPP-settings that can lead to
significant gains in EAB-BF performance.


title:
High Spatio-Temporal-Resolution Detection of Chlorophyll Fluorescence
  Dynamics from a Single Chloroplast with Confocal Imaging Fluorometer

abstract:
  Chlorophyll fluorescence (CF) is a key indicator to study plant physiology or
photosynthesis efficiency. Conventionally, CF is characterized by fluorometers,
which only allows ensemble measurement through wide-field detection. For
imaging fluorometers, the typical spatial and temporal resolutions are on the
order of millimeter and second, far from enough to study cellular/sub-cellular
CF dynamics. In addition, due to the lack of optical sectioning capability,
conventional imaging fluorometers cannot identify CF from a single cell or even
a single chloroplast. Here we demonstrated a novel fluorometer based on
confocal imaging, that not only provides high contrast images, but also allows
CF measurement with spatiotemporal resolution as high as micrometer and
millisecond. CF transient (the Kautsky curve) from a single chloroplast is
successfully obtained, with both the temporal dynamics and the intensity
dependences corresponding well to the ensemble measurement from conventional
studies. The significance of confocal imaging fluorometer is to identify the
variation among individual chloroplasts, e.g. the half-life period of the slow
decay in the Kautsky curve, that is not possible to analyze with wide-field
techniques. A linear relationship is found between excitation Intensity and the
temporal positions of peaks/valleys in the Kautsky curve. In addition, an
interesting 6-order increase in excitation intensity is found between
wide-field and confocal fluorometers, whose pixel integration time and optical
sectioning may account for this substantial difference. Confocal imaging
fluorometers provide micrometer and millisecond CF characterization, opening up
unprecedented possibilities toward detailed spatiotemporal analysis of CF
transients and its propagation dynamics, as well as photosynthesis efficiency
analysis, on the scale of organelles, in a living plant.


title: Hyperbolic jigsaws and families of pseudomodular groups I

abstract:
  We show that there are infinitely many commensurability classes of
pseudomodular groups, thus answering a question raised by Long and Reid. These
are Fuchsian groups whose cusp set is all of the rationals but which are not
commensurable to the modular group. We do this by introducing a general
construction for the fundamental domains of Fuchsian groups obtained by gluing
together marked ideal triangular tiles, which we call hyperbolic jigsaw groups.


title: Automating Verification of Event-B Models

abstract:
  Event-B is one of more popular notations for model-based, proof driven
specification. It offers a fairly high-level mathematical lan- guage based on
FOL and ZF set theory and an economical yet expres- sive modelling notation.
Model correctness is established by discharging proving a number conjectures
constructed via a syntactic instantiation of schematic conditions. A large
proportion of provable conjectures re- quires proof hints from a user. For
larger models this becomes extremely onerous as identical or similar proofs
have to be repeated over and over, especially after model refactoring stages.
In the paper we briefly present a new Rodin Platform proof back-end based on
the Why3 umbrella prover.


title: On the integrable gravity coupled to fermions

abstract:
  In the present letter we indicate an extension of the pure gravity inverse
scattering integration technique to the case when fermions (introduced on the
base of supersymmetry) are present. In this way the integrability technique for
simple ($N=1$) supergravity in two space-time dimensions coupled to the matter
fields taking values in the Lie algebra of $E_{8\left( +8\right) }$ group is
developed. This theory contains matter living only in one Weyl representation
of $SO\left( 16\right) $ and represents the reduction to two dimensions of the
three-dimensional simple supergravity constructed in [1].
  Our spectral linear problem use superspace and covers the complete set of
principal bosonic and fermionic equations of motion. This linear system, as in
pure gravity, contains only the first order poles with respect to the spectral
parameter. The procedure of constructing the exact super-solitonic solutions is
outlined.


title: Colorings of odd or even chirality on hexagonal lattices

abstract:
  We define two classes of colorings that have odd or even chirality on
hexagonal lattices. This parity is an invariant in the dynamics of all loops,
and explains why standard Monte-Carlo algorithms are nonergodic. We argue that
adding the motion of "stranded" loops allows for parity changes. By
implementing this algorithm, we show that the even and odd classes have the
same entropy. In general, they do not have the same number of states, except
for the special geometry of long strips, where a Z$_2$ symmetry between even
and odd states occurs in the thermodynamic limit.


title: Quantum teleportation and Grover's algorithm without the wavefunction

abstract:
  In the same way as the quantum no-cloning theorem and quantum key
distribution in two preceding papers, entanglement-assisted quantum
teleportation and Grover's search algorithm are generalized by transferring
them to an abstract setting, including usual quantum mechanics as a special
case. This again shows that a much more general and abstract access to these
quantum mechanical features is possible than commonly thought. A non-classical
extension of conditional probability and, particularly, a very special type of
state-independent conditional probability are used instead of Hilbert spaces
and wavefunctions.


title: Possible Weyl fermions in the magnetic Kondo system CeSb

abstract:
  Materials where the electronic bands have unusual topologies allow for the
realization of novel physics and have a wide range of potential applications.
When two electronic bands with linear dispersions intersect at a point, the
excitations could be described as Weyl fermions which are massless particles
with a particular chirality. Here we report evidence for the presence of Weyl
fermions in the ferromagnetic state of the low-carrier density, strongly
correlated Kondo lattice system CeSb, from electronic structure calculations
and angle-dependent magnetoresistance measurements. When the applied magnetic
field is parallel to the electric current, a pronounced negative
magnetoresistance is observed within the ferromagnetic state, which is
destroyed upon slightly rotating the field away. These results give evidence
for CeSb belonging to a new class of Kondo lattice materials with Weyl fermions
in the ferromagnetic state.


title: On the dynamics of dust during protostellar collapse

abstract:
  The dynamics of dust and gas can be quite different from each other when the
dust is poorly coupled to the gas. In protoplanetary discs, it is well known
that this decoupling of the dust and gas can lead to diverse spatial structures
and dust-to-gas ratios. In this paper, we study the dynamics of dust and gas
during the earlier phase of protostellar collapse, before a protoplanetary disc
is formed. We find that for dust grains with sizes < 10 micron, the dust is
well coupled during the collapse of a rotating, pre-stellar core and there is
little variation of the dust-to-gas ratio during the collapse. However, if
larger grains are present, they may have trajectories that are very different
from the gas during the collapse, leading to mid-plane settling and/or
oscillations of the dust grains through the mid-plane. This may produce
variations in the dust-to-gas ratio and very different distributions of large
and small dust grains at the very earliest stages of star formation, if large
grains are present in pre-stellar cores.


title: Coarse mesh partitioning for tree based AMR

abstract:
  In tree based adaptive mesh refinement, elements are partitioned between
processes using a space filling curve. The curve establishes an ordering
between all elements that derive from the same root element, the tree. When
representing more complex geometries by patching together several trees, the
roots of these trees form an unstructured coarse mesh. We present an algorithm
to partition the elements of the coarse mesh such that (a) the fine mesh can be
load-balanced to equal element counts per process regardless of the
element-to-tree map and (b) each process that holds fine mesh elements has
access to the meta data of all relevant trees. As an additional feature, the
algorithm partitions the meta data of relevant ghost (halo) trees as well. We
develop in detail how each process computes the communication pattern for the
partition routine without handshaking and with minimal data movement. We
demonstrate the scalability of this approach on up to 917e3 MPI ranks and
.37e12 coarse mesh elements, measuring run times of one second or less.


title:
On complex Langevin dynamics and zeroes of the measure I: Formal proof
  and simple models

abstract:
  In the complex Langevin approach to lattice simulations at nonzero density,
zeroes of the fermion determinant lead to a meromorphic drift and hence a need
to revisit the theoretical derivation. We discuss how poles in the drift affect
the formal justification of the approach and then explore the various potential
issues in simple models, in a manner that is applicable to heavy dense and full
QCD.


title:
On complex Langevin dynamics and zeroes of the measure II: Fermionic
  determinant

abstract:
  Lattice QCD at non-vanishing chemical potential is studied using the complex
Langevin equation (CLE). One of the conditions for the correctness of the
results of the CLE is that the zeroes of the measure coming from the fermionic
determinant are outside of the distribution of the configurations, or at least
in a region where support for the distribution is very much suppressed. We
investigate this issue for Heavy Dense QCD (HDQCD) and full QCD at high
temperatures. In HDQCD it is found that the configurations move closest to the
zeroes of the measure around the critical chemical potential of the onset
transition, where the sign problem is diminished, but results remain largely
unaffected. In full QCD at high temperatures the investigation of the spectrum
of the Dirac operator yields a similar observation: the results are unaffected
by the issue of the poles.


title:
Quantum-gravitational effects on gauge-invariant scalar and tensor
  perturbations during inflation: The slow-roll approximation

abstract:
  We continue our study on corrections from canonical quantum gravity to the
power spectra of gauge-invariant inflationary scalar and tensor perturbations.
A direct canonical quantization of a perturbed inflationary universe model is
implemented, which leads to a Wheeler-DeWitt equation. For this equation, a
semiclassical approximation is applied in order to obtain a Schroedinger
equation with quantum-gravitational correction terms, from which we calculate
the corrections to the power spectra. We go beyond the de Sitter case discussed
earlier and analyze our model in the first slow-roll approximation, considering
terms linear in the slow-roll parameters. We find that the dominant correction
term from the de Sitter case, which leads to an enhancement of power on the
largest scales, gets modified by terms proportional to the slow-roll
parameters. A correction to the tensor-to-scalar ratio is also found at second
order in the slow-roll parameters. Making use of the available experimental
data, the magnitude of these quantum-gravitational corrections is estimated.
Finally, the effects for the temperature anisotropies in the cosmic microwave
background are qualitatively obtained.


title: Search for Dark Matter in pp Collisions with CMS

abstract:
  Searches in CMS for dark matter in final states with invisible particles
recoiling against jets, top, W, Z, photon, and Higgs are presented. Various
topologies are explored, covering several specific dark-matter production
modes. The summary in a simplified-model framework of various searches for
direct dark matter production with the CMS detector is discussed, highlighting
sensitivities of the analyses under various assumptions of DM production.


title: Asymptotic analysis of the cyclic structure of permutations

abstract:
  This is my dissertation. Its research object is a symmetric group of
permutations acting on a finite set. The density of permutations with a given
cycle structure pattern is explored when the group order tends to infinity. New
and sharper asymptotic formulas are obtained. The latter are applied in
approximations of the cycle vector distribution of a random permutation. The
saddle-point method, Lagrange-B\"urmann inversion formula, Laplace
transformations, and other techniques of complex analysis are applied.


title: Imperfect fluid cosmological model in modified gravity

abstract:
  In this article, we considered the bulk viscous fluid in the formalism of
modified gravity in which the general form of a gravitational action is $f(R,
T)$ function, where $R$ is the curvature scalar and $T$ is the trace of the
energy momentum tensor within the frame of flat FRW space time. The
cosmological model dominated by bulk viscous matter with total bulk viscous
coefficient expressed as a linear combination of the velocity and acceleration
of the expansion of the universe in such a way that
$\xi=\xi_0+\xi_1\frac{\dot{a}}{a}+\xi_2\frac{\ddot{a}}{\dot{a}}$, where
$\xi_0$, $\xi_1$ and $\xi_2$ are constants. We take $p=(\gamma-1)\rho$, where
$0\le\gamma\le2$ as an equation of state for perfect fluid. The exact solutions
to the corresponding field equations are obtained by assuming a particular
model of the form of $f(R, T)=R+2f(T)$, where $f(T)=\lambda T$, $\lambda$ is
constant. We studied the four possible scenarios for different values of
$\gamma$, such as $\gamma=0$, $\gamma=\frac{2}{3}$, $\gamma=1$ and
$\gamma=\frac{4}{3}$ with the possible positive and negative ranges of
$\lambda$ to observe the accelerated expansion history of the universe.
Finally, a big-rip singularity is observed.


title: Quintessence background for $5D$ Einstein-Gauss-Bonnet black holes

abstract:
  As we know that the Lovelock theory is an extension of the general relativity
to the higher-dimensions, in this theory the first and the second order terms
correspond to the general relativity and the Einstein-Gauss-Bonnet gravity,
respectively. We obtain a $5D$ black hole solution in Einstein-Gauss-Bonnet
gravity surrounded by the quintessence matter, and also analyze their
thermodynamical properties. Owing to the quintessence corrected black hole, the
thermodynamic quantities have also been corrected except for the black hole
entropy, and phase transition is achievable. The phase transition for the
thermodynamic stability, is characterized by a discontinuity in the specific
heat at $r=r_C$, with the stable (unstable) branch for $r < (>) r_C$.


title: Charged BTZ black holes in the context of massive gravity's rainbow

abstract:
  BTZ black holes are excellent laboratories for studying black hole
thermodynamics which is a bridge between classical general relativity and
quantum nature of gravitation. In addition, three-dimensional gravity could
have equipped us for exploring some of the ideas behind the two dimensional
conformal field theory based on the $AdS_{3}/CFT_{2}$. Considering the
significant interests in these regards, we examine charged BTZ black holes. We
consider the system contains massive gravity with energy dependent spacetime to
enrich the results. In order to make high curvature (energy) BTZ black holes
more realistic, we modify the theory by energy dependent constants. We
investigate thermodynamic properties of the solutions by calculating heat
capacity and free energy. We also analyze thermal stability and study the
possibility of Hawking-Page phase transition. At last, we study geometrical
thermodynamics of these black holes and compare the results of various
approaches.


title: Relative enumerative invariants of real nodal del Pezzo surfaces

abstract:
  The surfaces considered are real, rational and have a unique smooth real
$(-2)$-curve. Their canonical class $K$ is strictly negative on any other
irreducible curve in the surface and $K^2>0$. For surfaces satisfying these
assumptions, we suggest a certain signed count of real rational curves that
belong to a given divisor class and are simply tangent to the $(-2)$-curve at
each intersection point. We prove that this count provides a number which
depends neither on the point constraints nor on deformation of the surface
preserving the real structure and the $(-2)$-curve.


title: OSEFT or how to go beyond hard thermal loops

abstract:
  We show that effective field theory techniques can be applied in the high
temperature $T$ regime of plasmas to improve the accuracy of the physics of the
hard scales (or scales of order $T$), and as a by-product, also that of the
soft scales (or scales of order $gT$). At leading order in the coupling
constant the hard scales of the plasma can be viewed as on-shell classical
particles. Based on this observation, and without any reference to the state of
the system, we derive an effective field theory describing the quantum
fluctuations around an on-shell fermion with energy $p$, described as a set of
high dimension operators over the on-shell energy $p$. When applied to systems
close to thermal equilibrium, where for most on-shell particles $p \sim T$, we
show that the on-shell effective field theory (OSEFT) properly describes the
HTL photon polarization tensor of QED, and its 1/T corrections. For the soft
scales the first non-vanishing power correction turns out to be a perturbative
correction to the HTL result.


title: Tagging fast neutrons from a 252Cf fission-fragment source

abstract:
  Coincidence and time-of-flight measurement techniques are employed to tag
fission neutrons emitted from a 252Cf source sealed on one side with a very
thin layer of Au. The source is positioned within a gaseous 4He scintillator
detector. Together with alpha particles, both light and heavy fission fragments
pass through the thin layer of Au and are detected. The fragments enable the
corresponding fission neutrons, which are detected in a NE-213
liquid-scintillator detector, to be tagged. The resulting continuous
polychromatic beam of tagged neutrons has an energy dependence that agrees
qualitatively with expectations. We anticipate that this technique will provide
a cost-effective means for the characterization of neutron-detector efficiency
in the energy range 1 - 6 MeV.


title:
Predicting User Roles in Social Networks using Transfer Learning with
  Feature Transformation

abstract:
  How can we recognise social roles of people, given a completely unlabelled
social network? We present a transfer learning approach to network role
classification based on feature transformations from each network's local
feature distribution to a global feature space. Experiments are carried out on
real-world datasets. (See manuscript for the full abstract.)


title: Alg\`ebre commutative M\'ethodes constructives

abstract:
  This book is an introductory course to basic commutative algebra with a
particular emphasis on finitely generated projective modules, which constitutes
the algebraic version of the vector bundles in differential geometry. We adopt
the constructive point of view, with which all existence theorems have an
explicit algorithmic content. In particular, when a theorem affirms the
existence of an object -- the solution of a problem -- a construction algorithm
of the object can always be extracted from the given proof. We revisit with a
new and often simplifying eye several abstract classical theories. In
particular, we review theories which did not have any algorithmic content in
their general natural framework, such as Galois theory, the Dedekind rings, the
finitely generated projective modules or the Krull dimension. Constructive
algebra is actually an old discipline, developed among others by Gauss and
Kronecker. We are in line with the modern "bible" on the subject, which is the
book by Ray Mines, Fred Richman and Wim Ruitenburg, A Course in Constructive
Algebra, published in 1988.


title: Classical and Quantum Two-Body Problem in General Relativity

abstract:
  The two-body problem in general relativity is reduced to the problem of an
effective particle (with an energy-dependent relativistic reduced mass) in an
external field. The effective potential is evaluated from the Born diagram of
the linearized quantum theory of gravity. It reduces to a Schwarzschild-like
potential with two different `Schwarzschild radii'. The results derived in a
weak field approximation are expected to be relevant for relativistic
velocities.


title: Increasing the throughput of machine translation systems using clouds

abstract:
  The manuscript presents an experiment at implementation of a Machine
Translation system in a MapReduce model. The empirical evaluation was done
using fully implemented translation systems embedded into the MapReduce
programming model. Two machine translation paradigms were studied: shallow
transfer Rule Based Machine Translation and Statistical Machine Translation.
  The results show that the MapReduce model can be successfully used to
increase the throughput of a machine translation system. Furthermore this
method enhances the throughput of a machine translation system without
decreasing the quality of the translation output.
  Thus, the present manuscript also represents a contribution to the seminal
work in natural language processing, specifically Machine Translation. It first
points toward the importance of the definition of the metric of throughput of
translation system and, second, the applicability of the machine translation
task to the MapReduce paradigm.


title:
Heter-LP: A heterogeneous label propagation algorithm and its
  application in drug repositioning

abstract:
  Drug repositioning offers an effective solution to drug discovery, saving
both time and resources by finding new indications for existing drugs.
Typically, a drug takes effect via its protein targets in the cell. As a
result, it is necessary for drug development studies to conduct an
investigation into the interrelationships of drugs, protein targets, and
diseases. Although previous studies have made a strong case for the
effectiveness of integrative network-based methods for predicting these
interrelationships, little progress has been achieved in this regard within
drug repositioning research. Moreover, the interactions of new drugs and
targets (lacking any known targets and drugs, respectively) cannot be
accurately predicted by most established methods. In this paper, we propose a
novel semi-supervised heterogeneous label propagation algorithm named Heter-LP,
which applies both local as well as global network features for data
integration. To predict drug-target, disease-target, and drug-disease
associations, we use information about drugs, diseases, and targets as
collected from multiple sources at different levels. Our algorithm integrates
these various types of data into a heterogeneous network and implements a label
propagation algorithm to find new interactions. Statistical analyses of 10-fold
cross-validation results and experimental analysis support the effectiveness of
the proposed algorithm.


title:
Observation of Anomalous Magnetic Moments in Superconducting Bi/Ni
  Bilayer

abstract:
  There have been continuous efforts in searching for unconventional
superconductivity over the past five decades. Compared to the well-established
d-wave superconductivity in cuprates, the existence of superconductivity with
other high-angular-momentum pairing symmetries is less conclusive. Bi/Ni
epitaxial bilayer is a potential unconventional superconductor with broken time
reversal symmetry (TRS), for that it demonstrates superconductivity and
ferromagnetism simultaneously at low temperatures. We employ a specially
designed superconducting quantum interference device (SQUID) to detect, on the
Bi/Ni bilayer, the orbital magnetic moment which is expected if the TRS is
broken. An anomalous hysteretic magnetic response has been observed in the
superconducting state, providing the evidence for the existence of chiral
superconducting domains in the material.


title: Networks of fixed-cycle intersections

abstract:
  We present an algorithmic method for analyzing networks of intersections with
static signaling, with as primary example a line network that allows traffic
flow over several intersections in one main direction. The method decomposes
the network into separate intersections and treats each intersection in
isolation using an extension of the fixed-cycle traffic-light (FCTL) queue. The
network effects are modeled by matching the output process of one intersection
with the input process of the next (downstream) intersection. This network
analysis provides insight into wave phenomena due to vehicles experiencing
progressive cascades of green lights and sheds light on platoon forming in case
of imperfections. Our algorithm is shown to match results from extensive
discrete-event simulations and can also be applied to more complex network
structures.


title:
Measurement of excitation spectra in the ${}^{12}$C$(p,d)$ reaction near
  the $\eta'$ emission threshold

abstract:
  Excitation spectra of $^{11}$C were measured in the $^{12}$C$(p,d)$ reaction
near the $\eta'$ emission threshold. A proton beam extracted from the
synchrotron SIS-18 at GSI with an incident energy of 2.5 GeV impinged on a
carbon target. The momenta of deuterons emitted at 0 degrees were precisely
measured with the fragment separator FRS operated as a spectrometer. In
contrast to theoretical predictions on the possible existence of deeply bound
$\eta'$ mesic states in carbon nuclei, no distinct structures were observed
associated with the formation of bound states. The spectra were analyzed to set
stringent constraints on the formation cross section and on the hitherto
barely-known $\eta'$-nucleus interaction.


title: Contractible curves on a rational surface

abstract:
  In this paper we prove that if S is a smooth, irreducible, projective,
rational, complex surface and D an effective, connected, reduced divisor on S,
then the pair (S,D) is contractible if the log-Kodaira dimension of the pair is
$-\infty$. More generally, we even prove that this contraction is possible
without blowing up an assigned cluster of points on S. Using the theory of
peeling, we are also able to give some information in the case D is not
connected.


title: Local clustering in scale-free networks with hidden variables

abstract:
  We investigate the presence of triangles in a class of correlated random
graphs in which hidden variables determine the pairwise connections between
vertices. The class rules out self-loops and multiple edges and allows for
negative degree correlations (disassortative mixing) due to infinite-variance
degrees controlled by a structural cutoff $h_s$ and natural cutoff $h_c$. We
show that local clustering decreases with the hidden variable (or degree). We
also determine how the average clustering coefficient $C$ scales with the
network size $N$, as a function of $h_s$ and $h_c$. For scale-free networks
with exponent $2<\tau<3$ and the default choices $h_s\sim N^{1/2}$ and $h_c\sim
N^{1/(\tau-1)}$ this gives $C\sim N^{2-\tau}\ln N$ for the universality class
at hand. We characterize the extremely slow decay of $C$ when $\tau\approx 2$
and show that for $\tau=2.1$, say, clustering only starts to vanish for
networks as large as $N=10^{11}$.


title:
Large electroweak corrections to vector-boson scattering at the Large
  Hadron Collider

abstract:
  For the first time full next-to-leading-order electroweak corrections to
off-shell vector-boson scattering are presented. The computation features the
complete matrix elements, including all non-resonant and off-shell
contributions, to the electroweak process $\mathrm{p} \mathrm{p} \to \mu^+
\nu_\mu \mathrm{e}^+ \nu_{\mathrm{e}} \mathrm{j} \mathrm{j}$. It is fully
differential, and event selections are applied to the final states such that
the predictions can be directly compared to experimental measurements. The
corrections are surprisingly large, reaching -16% for the fiducial cross
section and up to -40% in the tails of distributions. These large corrections
are due to enhanced logarithms in the bosonic virtual corrections.


title: Unexpected Default in an Information Based Model

abstract:
  This paper provides sufficient conditions for the time of bankruptcy (of a
company or a state) for being a totally inaccessible stopping time and provides
the explicit computation of its compensator in a framework where the flow of
market information on the default is modelled explicitly with a Brownian bridge
between 0 and 0 on a random time interval.


title:
Consequences of the functional equation of the $p$-adic $L$-function of
  an elliptic curve

abstract:
  We prove that the first two coefficients in the series expansion around $s=1$
of the $p$-adic $L$-function of an elliptic curve over $\mathbb{Q}$ are related
by a formula involving the conductor of the curve. This is analogous to a
recent result of Wuthrich for the classical $L$-function, which makes use of
the functional equation. We present a few other consequences for the $p$-adic
$L$-function and a generalisation to the base-change to an abelian number
field.


title:
An integrated version of Varadhan's asymptotics for lower-order
  perturbations of strong local Dirichlet forms

abstract:
  The studies of Ram\'irez, Hino-Ram\'irez, and Ariyoshi-Hino showed that an
integrated version of Varadhan's asymptotics holds for Markovian semigroups
associated with arbitrary strong local symmetric Dirichlet forms. In this
paper, we consider non-symmetric bilinear forms that are the sum of strong
local symmetric Dirichlet forms and lower-order perturbed terms. We give
sufficient conditions for the associated semigroups to have asymptotics of the
same type.


title:
The harmonic influence in social networks and its distributed
  computation by message passing

abstract:
  In this paper we elaborate upon a measure of node influence in social
networks, which was recently proposed by Vassio et al., IEEE Trans. Control
Netw. Syst., 2014. This measure quantifies the ability of the node to sway the
average opinion of the network. Following the approach by Vassio et al., we
describe and study a distributed message passing algorithm that aims to compute
the nodes' influence. The algorithm is inspired by an analogy between
potentials in electrical networks and opinions in social networks. If the graph
is a tree, then the algorithm computes the nodes' influence in a number of
steps equal to the diameter of the graph. On general graphs, the algorithm
converges asymptotically to a meaningful approximation of the nodes' influence.
In this paper we detail the proof of convergence, which greatly extends
previous results in the literature, and we provide simulations that illustrate
the usefulness of the returned approximation.


title:
A Comparison of Word Embeddings for English and Cross-Lingual Chinese
  Word Sense Disambiguation

abstract:
  Word embeddings are now ubiquitous forms of word representation in natural
language processing. There have been applications of word embeddings for
monolingual word sense disambiguation (WSD) in English, but few comparisons
have been done. This paper attempts to bridge that gap by examining popular
embeddings for the task of monolingual English WSD. Our simplified method leads
to comparable state-of-the-art performance without expensive retraining.
Cross-Lingual WSD - where the word senses of a word in a source language e come
from a separate target translation language f - can also assist in language
learning; for example, when providing translations of target vocabulary for
learners. Thus we have also applied word embeddings to the novel task of
cross-lingual WSD for Chinese and provide a public dataset for further
benchmarking. We have also experimented with using word embeddings for LSTM
networks and found surprisingly that a basic LSTM network does not work well.
We discuss the ramifications of this outcome.


title: Comments on the paper "Terminal retrograde turn of rolling rings"

abstract:
  Mir Abbas Jalali et al. [Phys. Rev. E 92, 032913(2015)] explained the
retrograde turn of rings by aerodynamic phenomena due to the presence of a
central hole in the ring as opposed to a disk. The results of our experiments
suggest that the drag torque is not the main reason for the retrograde turn of
the rings, and the results of theoretical research have shown that such a
motion is possible for both the ring and the disk in the case of rolling
without slipping.


title: A correspondence of good G-sets under partial geometric quotients

abstract:
  For a complex variety $\hat X$ with an action of a reductive group $\hat G$
and a geometric quotient $\pi: \hat X \to X$ by a closed normal subgroup $H
\subset \hat G$, we show that open sets of $X$ admitting good quotients by
$G=\hat G / H$ correspond bijectively to open sets in $\hat X$ with good $\hat
G$-quotients. We use this to compute GIT-chambers and their associated
quotients for the diagonal action of $\text{PGL}_2$ on $(\mathbb{P}^1)^n$ in
certain subcones of the $\text{PGL}_2$-effective cone via a torus action on
affine space. This allows us to represent these quotients as toric varieties
with fans determined by convex geometry.


title:
Relative entropy of excited states in conformal field theories of
  arbitrary dimensions

abstract:
  Extending our previous work, we study the relative entropy between the
reduced density matrices obtained from globally excited states in conformal
field theories of arbitrary dimensions. We find a general formula in the small
subsystem size limit. When one of the states is the vacuum of the CFT, our
result matches with the holographic entanglement entropy computations in the
corresponding bulk geometries, including AdS black branes. We also discuss the
first asymmetric part of the relative entropy and comment on some implications
of the results on the distinguishability of black hole microstates in AdS/CFT.


title:
A Unified Maximum Likelihood Approach for Optimal Distribution Property
  Estimation

abstract:
  The advent of data science has spurred interest in estimating properties of
distributions over large alphabets. Fundamental symmetric properties such as
support size, support coverage, entropy, and proximity to uniformity, received
most attention, with each property estimated using a different technique and
often intricate analysis tools.
  We prove that for all these properties, a single, simple, plug-in
estimator---profile maximum likelihood (PML)---performs as well as the best
specialized techniques. This raises the possibility that PML may optimally
estimate many other symmetric properties.


title:
A Finite Volume - Alternating Direction Implicit Approach for the
  Calibration of Stochastic Local Volatility Models

abstract:
  Calibration of stochastic local volatility (SLV) models to their underlying
local volatility model is often performed by numerically solving a
two-dimensional non-linear forward Kolmogorov equation. We propose a novel
finite volume (FV) discretization in the numerical solution of general 1D and
2D forward Kolmogorov equations. The FV method does not require a
transformation of the PDE. This constitutes a main advantage in the calibration
of SLV models as the pertinent PDE coefficients are often nonsmooth. Moreover,
the FV discretization has the crucial property that the total numerical mass is
conserved. Applying the FV discretization in the calibration of SLV models
yields a non-linear system of ODEs. Numerical time stepping is performed by the
Hundsdorfer-Verwer ADI scheme to increase the computational efficiency. The
non-linearity in the system of ODEs is handled by introducing an inner
iteration. Ample numerical experiments are presented that illustrate the
effectiveness of the calibration procedure.


title: Non-static ground state in SmB6: a form of time crystal?

abstract:
  Here we propose the existence of a non-static ground state in the Kondo
insulator SmB6, with a unique accompany-type valence fluctuation of Sm ions in
its bulk. Whether SmB6 is a fashion of time crystal is an intriguing issue.


title:
Corrections to Reissner-Nordstr\"om black hole solution due to
  exponential nonlinear electrodynamics

abstract:
  An exponential model of nonlinear electrodynamics coupled with the
gravitational field is analyzed. It was shown that weak, dominant, and strong
energy conditions are satisfied. We obtain corrections to Coulomb's law at
$r\rightarrow\infty$. It was demonstrated that electric-magnetic duality
between ${\cal F}$ and ${\cal P}$ frames is violated. The asymptotic black hole
solution at $r\rightarrow \infty$ is found that contains corrections to the
Reissner-Nordstr\"om solution. The electromagnetic mass of the black hole is
calculated, expressed through the parameter $\beta$ of the model.


title:
Linear waves in sheared flows. Lower bound of the vorticity growth and
  propagation discontinuities in the parameters space

abstract:
  This study provides sufficient conditions for the temporal monotonic decay of
enstrophy for two-dimensional perturbations traveling in the incompressible,
viscous, plane Poiseuille and Couette flows. Extension of J. L. Synge's
procedure (1938) to the initial-value problem allowed us to find the region of
the wavenumber-Reynolds number map where the enstrophy of any initial
disturbance cannot grow. This region is wider than the kinetic energy's one. We
also show that the parameters space is split in two regions with clearly
distinct propagation and dispersion properties.


title:
Event-by-event $v_n$ correlations of soft hadrons and heavy mesons in
  heavy ion collisions

abstract:
  In this paper heavy quark energy loss models are embedded in full
event-by-event viscous hydrodynamic simulations to investigate the nuclear
suppression factor and azimuthal anisotropy of D$^0$ mesons in PbPb collisions
at 5.02 TeV in the $p_T$ range 8-40 GeV. In our model calculations, the
$R_\text{AA}$ of D$^0$ mesons is consistent with experimental data from the CMS
experiment. We present the first calculations of heavy flavor cumulants
$v_2\{2\}$ and $v_3\{2\}$ (and also discuss $v_2\{4\}$), which is also
consistent with experimental data. Event-shape engineering techniques are used
to compute the event-by-event correlation between the soft hadron $v_n$ and the
heavy meson $v_n$. We predict a linear correlation between these observables on
an event-by-event basis.


title:
A Near-Linear Approximation Scheme for Multicuts of Embedded Graphs with
  a Fixed Number of Terminals

abstract:
  For an undirected edge-weighted graph $G$ and a set $R$ of pairs of vertices
called pairs of terminals, a multicut is a set of edges such that removing
these edges from $G$ disconnects each pair in $R$. We provide an algorithm
computing a $(1+\varepsilon)$-approximation of the minimum multicut of a graph
$G$ in time $(g+t)^{(O(g+t)^3)}\cdot(1/\varepsilon)^{O(g+t)} \cdot n \log n$,
where $g$ is the genus of $G$ and $t$ is the number of terminals.
  This result is tight in several aspects, as the minimum multicut problem is
both APX-hard and W[1]-hard (parameterized by the number of terminals), even on
planar graphs (equivalently, when $g=0$).
  In order to achieve this, our article leverages on a novel characterization
of a minimum multicut as a family of Steiner trees in the universal cover of a
surface on which $G$ is embedded. The algorithm heavily relies on topological
techniques, and in particular on the use of homotopical tools and computations
in covering spaces, which we blend with classic ideas stemming from
approximation schemes for planar graphs and low-dimensional geometric inputs.


title:
A Second Order Energy Stable Scheme for the Cahn-Hilliard-Hele-Shaw
  Equations

abstract:
  We present a second-order-in-time finite difference scheme for the
Cahn-Hilliard-Hele-Shaw equations. This numerical method is uniquely solvable
and unconditionally energy stable. At each time step, this scheme leads to a
system of nonlinear equations that can be efficiently solved by a nonlinear
multigrid solver. Owing to the energy stability, we derive an $\ell^2 (0,T;
H_h^3)$ stability of the numerical scheme. To overcome the difficulty
associated with the convection term $\nabla \cdot (\phi \boldsymbol{u})$, we
perform an $\ell^\infty (0,T; H_h^1)$ error estimate instead of the classical
$\ell^\infty (0,T; \ell^2)$ one to obtain the optimal rate convergence
analysis. In addition, various numerical simulations are carried out, which
demonstrate the accuracy and efficiency of the proposed numerical scheme.


title:
A Public Comment on NCCoE's White Paper on Privacy-Enhancing Identity
  Brokers

abstract:
  The National Cybersecurity Center of Excellence (NCCoE) (in the United
States) has published on October 19, 2015, a white paper on "privacy-enhanced
identity brokers." We present here a reply to their request for public
comments. We enumerate concerns whose consideration we find paramount for the
design of a privacy-enhancing identity brokering solution, for identification
and authentication of citizens into myriad online services, and we recommend
how to incorporate them into a revised white paper. Our observations, focused
on privacy, security, auditability and forensics, are mostly based on a
recently published research paper (PETS 2015) about two nation-scale brokered
identification systems.


title: General formalism for Fourier based Wave Front Sensing

abstract:
  We introduce in this article a general formalism for Fourier based wave front
sensing. To do so, we consider the filtering mask as a free parameter. Such an
approach allows to unify sensors like the Pyramid Wave Front Sensor (PWFS) and
the Zernike Wave Front Sensor (ZWFS). In particular, we take the opportunity to
generalize this two sensors in terms of sensors' class where optical quantities
as, for instance, the apex angle for the PWFS or the depth of the Zernike mask
for the ZWFS become free parameters. In order to compare all the generated
sensors of this two classes thanks to common performance criteria, we firstly
define a general phase-linear quantity that we call meta-intensity. Analytical
developments allow then to split the perfectly phase-linear behavior of a WFS
from the non-linear contributions making robust and analytic definitions of the
sensitivity and the linearity range possible. Moreover, we define a new
quantity called the SD factor which characterizes the trade-off between these
two antagonist quantities. These developments are generalized for modulation
device and polychromatic light. A non-exhaustive study is finally led on the
two classes allowing to retrieve the usual results and also make explicit the
influence of the optical parameters introduced above.


title:
Self-Sustained Clusters as Drivers of Computational Hardness in $p$-spin
  Models

abstract:
  While macroscopic properties of spin glasses have been thoroughly
investigated, their manifestation in the corresponding microscopic
configurations is much less understood. Cases where both descriptions have been
provided, such as constraint satisfaction problems, are limited to their ground
state properties. To identify the emerging microscopic structures with
macroscopic phases at different temperatures, we study the $p$-spin model with
$p\!=\!3$. We investigate the properties of self-sustained clusters, defined as
variable sets where in-cluster induced fields dominate over the field induced
by out-cluster spins, giving rise to stable configurations with respect to
fluctuations. We compute the entropy of self-sustained clusters as a function
of temperature and their sizes. In-cluster fields properties and the difference
between in-cluster and out-cluster fields support the observation of
slow-evolving spins in spin models. The findings are corroborated by
observations in finite dimensional lattices at low temperatures.


title: Relations of the spaces $A^p(\Omega)$ and $C^p(\partial\Omega)$

abstract:
  In this paper we prove that for functions $f\in A(D)$ there is an equivalence
between the continuous extension of their derivatives over the boundary and the
differentiability of the map $t\mapsto f(e^{it})$. More specifically, we are
able to prove that $A^p(D)= A(D)\cap C^p(\mathbb{T})$ by making use of the
Poisson representation. Moreover, we extend our results over Jordan domains
bounded by an analytic Jordan curve by using what we initially prove on the
disk in combination with the Osgood- Caratheodory theorem.