title:
Contrasting diffusion behaviors of O and F atoms on graphene and within
  bilayer graphene

abstract:
  The chemical modification of graphene with adatoms is of importance for
nanoelectronics applications. Based on first-principles density-functional
theory calculations with including van der Waals interactions, we present a
comparative study of the diffusion characteristics of oxygen (O) and fluorine
(F) atoms both on graphene and between the layers of bilayer graphene. We find
that O and F atoms have lower binding energies between the layers of bilayer
graphene compared to on graphene. Interestingly, the calculated diffusion
barrier for the O atom slightly increases from 0.81 eV on graphene to 0.85 eV
within bilayer graphene, while that for the F atom significantly decreases from
0.30 eV on graphene to 0.18 eV within bilayer graphene. Such contrasting
behaviors of the O and F diffusions within bilayer graphene can be traced to
their different bonding natures: i.e., the O adatom that has a strongly
covalent C$-$O$-$C bonding on the bridge site of the C$-$C bond diffuses on one
graphene layer with a slight interference of the other layer, while the F
adatom that has a weakly ionic F$-$C bonding on top of a C atom easily diffuses
by hopping between two graphene layers with accepting more electron charges
from the two layers. The present findings have important implications for
understanding the diffusion processes of F and O atoms on graphene and within
bilayer graphene.


title:
Extracting kinetic freeze-out temperature and radial flow velocity from
  an improved Tsallis distribution

abstract:
  We analyze the transverse momentum ($p_T$) spectra of identified particles
($\pi^{\pm}$, $K^{\pm}$, $p$, and $\bar p$) produced in gold-gold (Au-Au) and
lead-lead (Pb-Pb) collisions over a $\sqrt{s_{NN}}$ (center-of-mass energy per
nucleon pair) range from 14.5 GeV [one of the Relativistic Heavy Ion Collider
(RHIC) energies] to 2.76 TeV [one of the Large Hadron Collider (LHC) energies].
For the spectra with a narrow $p_T$ range, an improved Tsallis distribution
which is in fact the Tsallis distribution with radial flow is used. For the
spectra with a wide $p_T$ range, a superposition of the improved Tsallis
distribution and an inverse power-law is used. Both the extracted kinetic
freeze-out temperature ($T_0$) and radial flow velocity ($\beta_T$) increase
with the increase of $\sqrt{s_{NN}}$, which indicates a higher excitation and
larger expansion of the interesting system at the LHC. Both the values of $T_0$
and $\beta_T$ in central collisions are slightly larger than those in
peripheral collisions, and they are independent of isospin and slightly
dependent on mass.


title:
Rationally almost periodic sequences, polynomial multiple recurrence and
  symbolic dynamics

abstract:
  A set $R\subset \mathbb{N}$ is called rational if it is well-approximable by
finite unions of arithmetic progressions. Examples of rational sets include
many classical sets of number-theoretical origin such as the set of squarefree
numbers, the set of abundant numbers, or sets of the form
$\Phi_x:=\{n\in\mathbb{N}: \frac{\boldsymbol{\varphi}(n)}{n}<x\}$, where
$x\in[0,1]$ and $\boldsymbol{\varphi}$ is Euler's totient function. We
investigate the combinatorial and dynamical properties of rational sets and
obtain new results in ergodic Ramsey theory. We show that if $R$ is a rational
set with $\overline{d}(R)>0$, then the following are equivalent:
  (a) $R$ is divisible, i.e. $\overline{d}(R\cap u \mathbb{N})>0$ for all
$u\in\mathbb{N}$.
  (b) $R$ is an averaging set of polynomial single recurrence.
  (c) $R$ is an averaging set of polynomial multiple recurrence.
  As an application, we show that if $R$ is rational and divisible, then for
any set $E\subset\mathbb{N}$ with $\overline{d}(E)>0$ and any polynomials
$p_i\in\mathbb{Q}[t]$,$i=1,\ldots,\ell$, which satisfy
$p_i(\mathbb{Z})\subset\mathbb{Z}$ and $p_i(0)=0$ for all
$i\in\{1,\ldots,\ell\}$, there exists $\beta>0$ such that the set $$\{n\in
R:\overline{d}( E\cap (E-p_1(n))\cap\ldots\cap(E-p_\ell(n)))>\beta\}$$ has
positive lower density.
  Ramsey-theoretical applications naturally lead to problems in symbolic
dynamics, which involve rationally almost periodic sequences. We prove that if
$\mathcal{A}$ is a finite alphabet, $\eta\in\mathcal{A}^\mathbb{N}$ is
rationally almost periodic, $S$ denotes the left-shift on
$\mathcal{A}^\mathbb{Z}$ and $$X:=\{y\in \mathcal{A}^\mathbb{Z} : \text{each
finite word appearing in $y$ appears in }\eta\},$$ then $\eta$ is a generic
point for an $S$-invariant probability measure $\nu$ on $X$ such that
$(X,\nu,S)$ is ergodic and has rational discrete spectrum.


title: Mean-Reverting Portfolio Design via Majorization-Minimization Method

abstract:
  This paper considers the mean-reverting portfolio design problem arising from
statistical arbitrage in the financial markets. The problem is formulated by
optimizing a criterion characterizing the mean-reversion strength of the
portfolio and taking into consideration the variance of the portfolio and an
investment budget constraint at the same time. An efficient algorithm based on
the majorization-minimization (MM) method is proposed to solve the problem.
Numerical results show that our proposed mean-reverting portfolio design method
can significantly outperform every underlying single spread and the benchmark
method in the literature.


title:
A note on the Poisson bracket of 2d smeared fluxes in loop quantum
  gravity

abstract:
  We show that the non-Abelian nature of geometric fluxes---the corner-stone in
the definition of quantum geometry in the framework of loop quantum gravity
(LQG)---follows directly form the continuum canonical commutations relations of
gravity in connection variables and the validity of the Gauss law. The present
treatment simplifies previous formulations and thus identifies more clearly the
root of the discreteness of geometric operators in LQG. Our statement
generalizes to arbitrary gauge theories and relies only on the validity of the
Gauss law.


title:
Robust topological insulator surface state in MBE grown
  (Bi_{1-x}Sb_x)_2Se_3

abstract:
  (Bi1-xSbx)2Se3 thin films have been prepared using molecular beam epitaxy
(MBE). We demonstrate the angle-resolved photoemission spectroscopy (ARPES) and
transport evidence for the existence of strong and robust topological surface
states in this ternary system. Large tunability in transport properties by
varying the Sb doping level has also been observed, where insulating phase
could be achieved at x=0.5. Our results reveal the potential of this system for
the study of tunable topological insulator and metal-insulator transition based
device physics.


title:
CAn't Touch This: Practical and Generic Software-only Defenses Against
  Rowhammer Attacks

abstract:
  Rowhammer is a hardware bug that can be exploited to implement privilege
escalation and remote code execution attacks. Previous proposals on rowhammer
mitigation either require hardware changes or follow heuristic-based approaches
(based on CPU performance counters). To date, there exists no instant
protection against rowhammer attacks on legacy systems.
  In this paper, we present the design and implementation of two practical and
efficient software-only defenses against rowhammer attacks. Our defenses
prevent the attacker from leveraging rowhammer to corrupt physically co-located
data in memory that is owned by a different system entity. Our first defense,
B-CATT, extends the system bootloader to disable vulnerable physical memory.
B-CATT is highly practical, does not require changes to the operating system,
and can be deployed on virtually all x86-based systems. While B-CATT is able to
stop all known rowhammer attacks, it does not yet tackle the fundamental
problem of missing memory isolation in physical memory. To address this
problem, we introduce our second defense G-CATT, a generic solution that
extends the physical memory allocator of the OS to physically isolate the
memory of different system entities (e.g., kernel and user space).
  As proof of concept, we implemented B-CATT on x86, and our generic defense,
G-CATT, on x86 and ARM to mitigate rowhammer-based kernel exploits. Our
extensive evaluation shows that both mitigation schemes (i) can stop available
real- world rowhammer attacks, (ii) impose virtually no run-time overhead for
common user and kernel benchmarks as well as commonly used applications, and
(iii) do not affect the stability of the overall system.


title: A Second Order Derivatives based Approach for Steganography

abstract:
  Steganography schemes are designed with the objective of minimizing a defined
distortion function. In most existing state of the art approaches, this
distortion function is based on image feature preservation. Since smooth
regions or clean edges define image core, even a small modification in these
areas largely modifies image features and is thus easily detectable. On the
contrary, textures, noisy or chaotic regions are so difficult to model that the
features having been modified inside these areas are similar to the initial
ones. These regions are characterized by disturbed level curves. This work
presents a new distortion function for steganography that is based on second
order derivatives, which are mathematical tools that usually evaluate level
curves. Two methods are explained to compute these partial derivatives and have
been completely implemented. The first experiments show that these approaches
are promising.


title:
A comparison between observed Algol-type double stars in the Solar
  neighborhood and evolutionary computations of galactic case A binaries with a
  B-type primary at birth

abstract:
  We first discuss a large set of evolutionary calculations of close binaries
with a B-type primary at birth and with a period such that the Roche lobe
overflow starts during the core hydrogen burning phase of the primary
(intermediate mass and massive case A binaries). The evolution of both
components is followed simultaneously allowing us to check for the occurrence
of contact binaries. We consider various models to treat a contact system and
the influence of these models on the predicted Algol-type system population is
investigated. We critically discuss the available observations of Algol-type
binaries with a B-type primary at birth. Comparing these observations with the
predictions allows us to put constraints on the contact star physics. We find
that mass transfer in Algols is most probably not conservative, that contact
during this phase does not necessarily lead to a merger, and that angular
momentum loss must be moderate.


title:
Electronic structure of buried LaNiO3 layers in (111)-oriented
  LaNiO3/LaMnO3 superlattices probed by soft x-ray ARPES

abstract:
  Taking advantage of the large electron escape depth of soft x-ray angle
resolved photoemission spectroscopy we report electronic structure measurements
of (111)-oriented [LaNiO3/LaMnO3] superlattices and LaNiO3 epitaxial films. For
thin films we observe a 3D Fermi surface with an electron pocket at the
Brillouin zone center and hole pockets at the zone vertices. Superlattices with
thick nickelate layers present a similar electronic structure. However, as the
thickness of the LaNiO3 is reduced the superlattices become insulating. These
heterostructures do not show a marked redistribution of spectral weight in
momentum space but exhibit a pseudogap of 50 meV.


title: Nondeterministic Communication Complexity of Random Boolean Functions

abstract:
  We study nondeterministic communication complexity and related concepts
(fooling sets, fractional covering number) of random functions $f\colon X\times
Y \to \{0,1\}$ where each value is chosen to be 1 independently with
probability $p=p(n)$, $n := |X|=|Y|$.


title: Investigating Low Level Protocols for Wireless Body Sensor Networks

abstract:
  The rapid development of medical sensors has increased the interest in
Wireless Body Area Network (WBAN) applications where physiological data from
the human body and its environment is gathered, monitored, and analyzed to take
the proper measures. In WBANs, it is essential to design MAC protocols that
ensure adequate Quality of Service (QoS) such as low delay and high
scalability. This paper investigates Medium Access Control (MAC) protocols used
in WBAN, and compares their performance in a high traffic environment. Such
scenario can be induced in case of emergency for example, where physiological
data collected from all sensors on human body should be sent simultaneously to
take appropriate action. This study can also be extended to cover collaborative
WBAN systems where information from different bodies is sent simultaneously
leading to high traffic. OPNET simulations are performed to compare the delay
and scalability performance of the different MAC protocols under the same
experimental conditions and to draw conclusions about the best protocol to be
used in a high traffic environment.


title: Geometric deep learning on graphs and manifolds using mixture model CNNs

abstract:
  Deep learning has achieved a remarkable performance breakthrough in several
fields, most notably in speech recognition, natural language processing, and
computer vision. In particular, convolutional neural network (CNN)
architectures currently produce state-of-the-art performance on a variety of
image analysis tasks such as object detection and recognition. Most of deep
learning research has so far focused on dealing with 1D, 2D, or 3D
Euclidean-structured data such as acoustic signals, images, or videos.
Recently, there has been an increasing interest in geometric deep learning,
attempting to generalize deep learning methods to non-Euclidean structured data
such as graphs and manifolds, with a variety of applications from the domains
of network analysis, computational social science, or computer graphics. In
this paper, we propose a unified framework allowing to generalize CNN
architectures to non-Euclidean domains (graphs and manifolds) and learn local,
stationary, and compositional task-specific features. We show that various
non-Euclidean CNN methods previously proposed in the literature can be
considered as particular instances of our framework. We test the proposed
method on standard tasks from the realms of image-, graph- and 3D shape
analysis and show that it consistently outperforms previous approaches.


title: Constraining Logotropic Unified Dark Energy Models

abstract:
  A unification of dark matter and dark energy in terms of a logotropic perfect
dark fluid has recently been proposed, where deviations with respect to the
standard $\Lambda {\rm CDM}$ model are dependent on a single parameter $B$. In
this paper we show that the requirement that the linear growth of cosmic
structures on comoving scales larger than $8 h^{-1} \, {\rm Mpc}$ is not
significantly affected with respect to the standard $\Lambda {\rm CDM}$ result
provides the strongest constraint to date on the model ($B <6 \times 10^{-7}$),
an improvement of more than three orders of magnitude over previous constraints
on the value of $B$. We further show that this constraint rules out the
logotropic Unified Dark Energy model as a possible solution to the small scale
problems of the $\Lambda$CDM model, including the cusp problem of Dark Matter
halos or the missing satellite problem, as well as the original version of the
model where the Planck energy density was taken as one of the two parameters
characterizing the logotropic dark fluid.


title:
Analog quantum simulation of the Rabi model in the ultra-strong coupling
  regime

abstract:
  The quantum Rabi model describes the fundamental mechanism of light-matter
interaction. It consists of a two-level atom or qubit coupled to a quantized
harmonic mode via a transversal interaction. In the weak coupling regime, it
reduces to the well-known Jaynes-Cummings model by applying a rotating wave
approximation (RWA). The RWA breaks down in the ultra-strong coupling (USC)
regime, where the effective coupling strength $g$ is comparable to the energy
$\omega$ of the bosonic mode, and remarkable features in the system dynamics
are revealed. We demonstrate an analog quantum simulation of an effective
quantum Rabi model in the USC regime, achieving a relative coupling ratio of
$g/\omega \sim 0.6$. The quantum hardware of the simulator is a superconducting
circuit embedded in a cQED setup. We observe fast and periodic quantum state
collapses and revivals of the initial qubit state, being the most distinct
signature of the synthesized model.


title:
Investigation of Higgs boson couplings via the production of a single
  top quark in association with a Higgs boson in the $\text{H} \to \text{b}
  \bar{\text{b}}$ channel

abstract:
  A search for the production of a single top quark in association with a Higgs
boson is performed using the decay $\text{H} \to \text{b} \bar{\text{b}}$. The
rate of this Higgs production mode is particularly sensitive to the relative
sign of the Higgs boson couplings to fermions and bosons. The 2015 pp
collisions data at a center-of-mass energy of 13 TeV are analyzed. This poster
focuses on the discrimination between signal and background events. Upper
limits, determined in the two-dimensional plane spanned by the coupling
modifiers of the Higgs boson to top quarks and to vector bosons, are presented.


title:
Comment on "Quasi-One-Dimensional Metal-Insulator Transitions in
  Compound Semiconductor Surfaces"

abstract:
  In a recent Letter, Zhao et al. [1] reported the origin of
quasi-one-dimensional metal-insulator (MI) transitions in compound
semiconductor surfaces. Based on a density-functional theory (DFT) calculation
within the generalized gradient approximation (GGA), they claimed that
one-atom-wide metallic structures formed by a selective bonding of H or Li
atoms to GaN(10-10) and ZnO(10-10) undergo the Peierls-type MI transitions,
leading to a charge-density-wave (CDW) formation with periodic lattice
distortion. However, we here demonstrate that such a CDW phase is due to the
artifact of the GGA, while the antiferromagnetic (AFM) ground state is
predicted by the hybrid DFT calculation and the exact-exchange plus correlation
in the random-phase approximation (EX + cRPA).
  [1] J. Z. Zhao, W. Fan, M. J. Verstraete, Z. Zanolli, J. Fan, X. B. Yang, H.
Xu, and S. Y. Tong, Phys. Rev. Lett. 117, 116101 (2016).


title: A Mellin space approach to the conformal bootstrap

abstract:
  We describe in more detail our approach to the conformal bootstrap which uses
the Mellin representation of $CFT_d$ four point functions and expands them in
terms of crossing symmetric combinations of $AdS_{d+1}$ Witten exchange
functions. We consider arbitrary external scalar operators and set up the
conditions for consistency with the operator product expansion. Namely, we
demand cancellation of spurious powers (of the cross ratios, in position space)
which translate into spurious poles in Mellin space. We discuss two contexts in
which we can immediately apply this method by imposing the simplest set of
constraint equations. The first is the epsilon expansion. We mostly focus on
the Wilson-Fisher fixed point as studied in an epsilon expansion about $d=4$.
We reproduce Feynman diagram results for operator dimensions to $O(\epsilon^3)$
rather straightforwardly. This approach also yields new analytic predictions
for OPE coefficients to the same order which fit nicely with recent numerical
estimates for the Ising model (at $\epsilon =1$). We will also mention some
leading order results for scalar theories near three and six dimensions. The
second context is a large spin expansion, in any dimension, where we are able
to reproduce and go a bit beyond some of the results recently obtained using
the (double) light cone expansion. We also have a preliminary discussion about
numerical implementation of the above bootstrap scheme in the absence of a
small parameter.

categories: hep-th cond-mat.stat-mech cond-mat.str-el hep-ph


title: Semantic Segmentation using Adversarial Networks

abstract:
  Adversarial training has been shown to produce state of the art results for
generative image modeling. In this paper we propose an adversarial training
approach to train semantic segmentation models. We train a convolutional
semantic segmentation network along with an adversarial network that
discriminates segmentation maps coming either from the ground truth or from the
segmentation network. The motivation for our approach is that it can detect and
correct higher-order inconsistencies between ground truth segmentation maps and
the ones produced by the segmentation net. Our experiments show that our
adversarial training approach leads to improved accuracy on the Stanford
Background and PASCAL VOC 2012 datasets.


title: Variability in the Milky Way: Contact binaries as diagnostic tools

abstract:
  We used the 50 cm Binocular Network (50BiN) telescope at Delingha Station
(Qinghai Province) of Purple Mountain Observatory (Chinese Academy of Sciences)
to obtain simultaneous $V$- and $R$-band observations of the old open cluster
NGC 188. Our aim was a search for populations of variable stars. We derived
light-curve solutions for six W Ursae Majoris (W UMa) eclipsing-binary systems
and estimated their orbital parameters. The resulting distance to the W UMas is
independent of the physical characteristics of the host cluster. We next
determined the current best period--luminosity relations for contact binaries
(CBs; scatter $\sigma < 0.10$ mag). We conclude that CBs can be used as
distance tracers with better than 5\% uncertainty. We apply our new relations
to the 102 CBs in the Large Magellanic Cloud, which yields a distance modulus
of $(m-M_V)_0=18.41\pm0.20$ mag.


title:
FPGA Implementation of $\mathbb{F}_2$-Linear Pseudorandom Number
  Generators Based on Zynq MPSoC: a Chaotic Iterations Post Processing Case
  Study

abstract:
  Pseudorandom number generation (PRNG) is a key element in hardware security
platforms like field-programmable gate array FPGA circuits. In this article, 18
PRNGs belonging in 4 families (xorshift, LFSR, TGFSR, and LCG) are physically
implemented in a FPGA and compared in terms of area, throughput, and
statistical tests. Two flows of conception are used for Register Transfer Level
(RTL) and High-level Synthesis (HLS). Additionally, the relations between
linear complexity, seeds, and arithmetic operations on the one hand, and the
resources deployed in FPGA on the other hand, are deeply investigated. In order
to do that, a SoC based on Zynq EPP with ARM Cortex-$A9$ MPSoC is developed to
accelerate the implementation and the tests of various PRNGs on FPGA hardware.
A case study is finally proposed using chaotic iterations as a post processing
for FPGA. The latter has improved the statistical profile of a combination of
PRNGs that, without it, failed in the so-called TestU01 statistical battery of
tests.


title:
Pictures of Blockscale Transport: Effective versus Ensemble Dispersion
  and Its Uncertainty

abstract:
  Using a Lagrangian framework, we discuss different conceptualizations of the
blockscale dispersion tensor. We distinguish effective and ensemble blockscale
dispersion, which measure the impact of subscale velocity fluctuations on
solute dispersion. Ensemble dispersion quantifies subscale velocity
fluctuations between realizations, which overestimates the actual velocity
variability. Effective dispersion on the other hand quantifies the actual
blockscale velocity variability and thus reflects the impact of subscale
velocity fluctuations on mixing and spreading. Based on these concepts, we
quantify the impact of subscale velocity fluctuations on solute particle
spreading and determine the governing equations for the coarse-grained
concentration distributions. We develop analytical and semi-analytical
expressions for the average and variance of the blockscale dispersion tensor in
3D flow fields as a function of the structural parameters characterizing the
subsurface. Our results illustrate the relevance of the blockscale, the initial
scale of the solute body and local-scale dispersion in controlling the
uncertainty of the plume's dispersive behavior. The analysis performed in this
work has implications in numerical modeling (i.e. grid design) and allows to
quantify the uncertainty of the blockscale dispersion tensor.


title: Detection of thermal radio emission from a single coronal giant

abstract:
  We report the detection of thermal continuum radio emission from the K0 III
coronal giant Pollux ($\beta$ Gem) with the Karl G. Jansky Very Large Array
(VLA). The star was detected at 21 and 9 GHz with flux density values of
$150\pm21$ and $43\pm8\,\mu$Jy, respectively. We also place a
$3\sigma_{\mathrm{rms}}$ upper limit of $23\,\mu$Jy for the flux density at 3
GHz. We find the stellar disk-averaged brightness temperatures to be
approximately 9500, 15000, and $<71000\,$K, at 21, 9, and 3 GHz, respectively,
which are consistent with the values of the quiet Sun. The emission is most
likely dominated by optically thick thermal emission from an upper chromosphere
at 21 and 9 GHz. We discuss other possible additional sources of emission at
all frequencies and show that there may also be a small contribution from
gyroresonance emission above active regions, coronal free-free emission and
free-free emission from an optically thin stellar wind, particularly at the
lower frequencies. We constrain the maximum mass-loss rate from Pollux to be
less than $3.7\times 10^{-11}\,M_{\odot}$ yr$^{-1}$ (assuming a wind terminal
velocity of 215 km s$^{-1}$), which is about an order of magnitude smaller than
previous constraints for coronal giants and is in agreement with existing
predictions for the mass-loss rate of Pollux. These are the first detections of
thermal radio emission from a single (i.e., non-binary) coronal giant and
demonstrate that low activity coronal giants like Pollux have atmospheres at
radio frequencies akin to the quiet Sun.


title: Improved L$^p$-Poincar\'e inequalities on the hyperbolic space

abstract:
  We investigate the possibility of improving the $p$-Poincar\'e inequality
$\|\nabla_{\mathbb{H}^N} u\|_p \ge \Lambda_p \|u\|_p$ on the hyperbolic space,
where $p>2$ and $\Lambda_p:=[(N-1)/p]^{p}$ is the best constant for which such
inequality holds. We prove several different, and independent, improved
inequalities, one of which is a Poincar\'e-Hardy inequality, namely an
improvement of the best $p$-Poincar\'e inequality in terms of the Hardy weight
$r^{-p}$, $r$ being geodesic distance from a given pole. Certain
Hardy-Maz'ya-type inequalities in the Euclidean half-space are also obtained.


title: Cooling atomic ions with visible and infra-red light

abstract:
  We demonstrate the ability to load, cool and detect singly-charged calcium
ions in a surface electrode trap using only visible and infrared lasers for the
trapped-ion control. As opposed to the standard methods of cooling using
dipole-allowed transitions, we combine power broadening of a quadrupole
transition at 729 nm with quenching of the upper level using a dipole allowed
transition at 854 nm. By observing the resulting 393 nm fluorescence we are
able to perform background-free detection of the ion. We show that this system
can be used to smoothly transition between the Doppler cooling and sideband
cooling regimes, and verify theoretical predictions throughout this range. We
achieve scattering rates which reliably allow recooling after collision events
and allow ions to be loaded from a thermal atomic beam. This work is compatible
with recent advances in optical waveguides, and thus opens a path in current
technologies for large-scale quantum information processing. In situations
where dielectric materials are placed close to trapped ions, it carries the
additional advantage of using wavelengths which do not lead to significant
charging, which should facilitate high rate optical interfaces between remotely
held ions.


title: An algebraic model for rational SO(3)-spectra

abstract:
  Greenlees established an equivalence of categories between the homotopy
category of rational SO(3)-spectra and the derived category DA(SO(3)) of a
certain abelian category. In this paper we lift this equivalence of homotopy
categories to the level of Quillen equivalences of model categories. Methods
used in this paper provide the first step towards obtaining an algebraic model
for the toral part of rational G-spectra, for any compact Lie group G.


title: Signs of Early-Stage Disk Growth Revealed with ALMA

abstract:
  We present ALMA 1.3 mm continuum, 12CO, C18O, and SO data for the Class 0
protostars, Lupus 3 MMS, IRAS 15398-3559, and IRAS 16253-2429 at resolutions of
~100 AU. By measuring a rotational profile in C18O, a 100 AU Keplerian disk
around a 0.3 Msun protostar is observed in Lupus 3 MMS. No 100 AU Keplerian
disks are observed in IRAS 15398-3559 and IRAS 16253-2429. Nevertheless,
embedded compact (<30 AU) continuum components are detected. The C18O emission
in IRAS 15398-3559 shows signatures of infall with a constant angular momentum.
IRAS 16253-2429 exhibits signatures of infall and rotation, but its rotational
profile is unresolved. By fitting the C18O data with our kinematic models, the
protostellar masses and the disk radii are inferred to be 0.01 Msun and 20 AU
in IRAS 15398-3559, and 0.03 Msun and 6 AU in IRAS 16253-2429. By comparing the
specific angular momentum profiles from 10,000 to 100 AU in 8 Class 0 and I
protostars, we find that the evolution of envelope rotation can be described
with conventional inside-out collapse models. In comparison with a sample of 18
protostars with known disk radii, our results reveal signs of disk growth, with
the disk radius increasing as M*^{0.8+/-0.14} or t^{1.09+\-0.37} in the Class 0
stage, where M* is the protostellar mass and t is the age. The disk growth rate
slows down in the Class I stage. Besides, we find a hint that the mass
accretion rate declines as t^{-0.26+\-0.04} from the Class 0 to I stages.


title:
On the Evaluation of the Privacy Breach in Disassociated Set-Valued
  Datasets

abstract:
  Data anonymization is gaining much attention these days as it provides the
fundamental requirements to safely outsource datasets containing identifying
information. While some techniques add noise to protect privacy others use
generalization to hide the link between sensitive and non-sensitive information
or separate the dataset into clusters to gain more utility. In the latter,
often referred to as bucketization, data values are kept intact, only the link
is hidden to maximize the utility. In this paper, we showcase the limits of
disassociation, a bucketization technique that divides a set-valued dataset
into $k^m$-anonymous clusters. We demonstrate that a privacy breach might occur
if the disassociated dataset is subject to a cover problem. We finally evaluate
the privacy breach using the quantitative privacy breach detection algorithm on
real disassociated datasets.


title: Card games as pointer structures: case studies in mobile CSP modelling

abstract:
  The author has long enjoyed using the CSP refinement checker FDR to solve
puzzles, as witnessed by examples in \cite{tpc,ucs}. Recent experiments have
shown that a number of games of patience (card games for one) are now well
within bounds. We discuss the modelling approaches used to tackle these and
avoid symmetric states. For two such games we reveal much higher percentages of
winnable games than was previously believed. The techniques developed for some
of these card games -which employ various dynamic patterns of cards - suggest
techniques for modelling pointer structures in CSP and FDR analogous to those
used with the pi-calculus. Most of these use CSP's ability to express mobile
systems.


title:
The Graph of the Pedigree Polytope is Asymptotically Almost Complete
  (Extended Abstract)

abstract:
  Graphs (1-skeletons) of Traveling-Salesman-related polytopes have attracted a
lot of attention. Pedigree polytopes are extensions of the classical Symmetric
Traveling Salesman Problem polytopes (Arthanari 2000) whose graphs contain the
TSP polytope graphs as spanning subgraphs (Arthanari 2013). Unlike TSP
polytopes, Pedigree polytopes are not "symmetric", e.g., their graphs are not
vertex transitive, not even regular. We show that in the graph of the pedigree
polytope, the quotient minimum degree over number of vertices tends to 1 as the
number of cities tends to infinity.


title:
Demonstration of Fully Nonlinear Spectrum Modulated System in the Highly
  Nonlinear Optical Transmission Regime

abstract:
  We report a 3 dB increase in the nonlinear threshold of a 64*0.5Gbaud 16-QAM
continuous-nonlinear-spectrum modulated signal by nonlinear multiplexing with
QPSK modulated multi-solitons, showing the first ever fully nonlinear-spectrum
modulated system in the highly nonlinear regime.


title: On depth zero L-packets for classical groups

abstract:
  By computing reducibility points of parabolically induced representations, we
construct, to within at most two unramified quadratic characters, the Langlands
parameter of an arbitrary depth zero irreducible cuspidal representation $\pi$
of a classical group (which may be not-quasi-split) over a nonarchimedean local
field of odd residual characteristic. From this, we can explicitly describe all
the irreducible cuspidal representations in the union of one, two, or four
L-packets, containing $\pi$. These results generalize the work of
DeBacker-Reeder (in the case of classical groups) from regular to arbitrary
tame Langlands parameters.


title:
Randomness and disorder of chaotic iterations. Applications in
  information security field

abstract:
  Design and cryptanalysis of chaotic encryption schemes are major concerns to
provide secured information systems. Pursuing our previous research works, some
well-defined discrete chaotic iterations that satisfy the reputed Devaney's
definition of chaos have been proposed. In this article, we summarize these
contributions and propose applications in the fields of pseudorandom number
generation, hash functions, and symmetric cryptography. For all these
applications, the proofs of chaotic properties are outlined.


title: Inequalities of extended Beta and extended hypergeometric functions

abstract:
  This paper studies the log-convexity of the extended beta functions. As a
consequence, Tur\'an-type inequalities are established.The monotonicity,
log-convexity, log-concavity of extended hypergeometric functions are deduced
by using the inequalities on extended beta functions,. The particular cases of
those results also gives the Tur\'an-type inequalities for extended confluent
and extended Gaussian hypergeometric functions. Some reverse of Tur\'an-type
inequalities also derived.


title:
Spin-orbit Hamiltonian for organic crystals from first principles
  electronic structure and Wannier functions

abstract:
  Spin-orbit coupling in organic crystals is responsible for many
spin-relaxation phenomena, going from spin diffusion to intersystem crossing.
With the goal of constructing effective spin-orbit Hamiltonians to be used in
multiscale approaches to the thermodynamical properties of organic crystals, we
present a method that combines density functional theory with the construction
of Wannier functions. In particular we show that the spin-orbit Hamiltonian
constructed over maximally localised Wannier functions can be computed by
direct evaluation of the spin-orbit matrix elements over the Wannier functions
constructed in absence of spin-orbit interaction. This eliminates the prob- lem
of computing the Wannier functions for almost degenerate bands, a problem
always present with the spin-orbit-split bands of organic crystals. Examples of
the method are presented for isolated molecules, for mono-dimensional chains of
Pb and C atoms and for triarylamine-based one-dimansional single crystals.


title: Compactification of a diagonal action on the product of CAT(-1) spaces

abstract:
  Let $X$ be a proper, non-compact CAT(-1) space, and $\Gamma$ a discrete
cocompact subgroup of the isometries of $X$. We compactify the diagonal action
of $\Gamma$ on $X \times X$ considering a domain of the horofunction boundary
with respect to the maximum metric.


title: More on DBI action in 4D $\mathcal{N}=1$ supergravity

abstract:
  We construct a Dirac-Born-Infeld (DBI) action coupled to a two-form field in
four dimensional $\mathcal{N}=1$ supergravity. Our superconformal formulation
of the action shows a universal way to construct it in various Poincar\'e
supergravity formulations. We generalize the DBI action to that coupled to
matter sector. We also discuss duality transformations of the DBI action, which
are useful for phenomenological and cosmological applications.


title: Motion of charged particle in a class of homogeneous spaces

abstract:
  We study the motion of charged particle under a natural choice of
electromagnetic field in a general class of compact homogeneous spaces. As a
special case we describe the motion in homogeneous Riemannian spaces $(G/H,g)$,
where $g$ is any deformation of a normal metric along the fibers of a
homogeneous fibration $K/H\rightarrow G/H \rightarrow G/K$.


title:
Structure of Herbig AeBe disks at the milliarcsecond scale A statistical
  survey in the H band using PIONIER-VLTI

abstract:
  Context. It is now generally accepted that the near-infrared excess of Herbig
AeBe stars originates in the dust of a circumstellar disk. Aims. The aims of
this article are to infer the radial and vertical structure of these disks at
scales of order one au, and the properties of the dust grains. Methods. The
program objects (51 in total) were observed with the H-band (1.6micron)
PIONIER/VLTI interferometer. The largest baselines allowed us to resolve (at
least partially) structures of a few tenths of an au at typical distances of a
few hundred parsecs. Dedicated UBVRIJHK photometric measurements were also
obtained. Spectral and 2D geometrical parameters are extracted via fits of a
few simple models: ellipsoids and broadened rings with azimuthal modulation.
Model bias is mitigated by parallel fits of physical disk models. Sample
statistics were evaluated against similar statistics for the physical disk
models to infer properties of the sample objects as a group. Results. We find
that dust at the inner rim of the disk has a sublimation temperature
Tsub~1800K. A ring morphology is confirmed for approximately half the resolved
objects; these rings are wide delta_r>=0.5. A wide ring favors a rim that, on
the star-facing side, looks more like a knife edge than a doughnut. The data
are also compatible with a the combination of a narrow ring and an inner disk
of unspecified nature inside the dust sublimation radius. The disk inner part
has a thickness z/r~0.2, flaring to z/r~0.5 in the outer part. We confirm the
known luminosity-radius relation; a simple physical model is consistent with
both the mean luminosity-radius relation and the ring relative width; however,
a significant spread around the mean relation is present. In some of the
objects we find a halo component, fully resolved at the shortest interferometer
spacing, that is related to the HAeBe class.


title: Multipliers and equivalences between Toeplitz kernels

abstract:
  Multipliers between kernels of Toeplitz operators are characterised in terms
of test functions (so-called maximal vectors for the kernels); these maximal
vectors may easily be parametrised in terms of inner and outer factorizations.
Immediate applications to model spaces are derived. The case of surjective
multipliers is also analysed. These ideas are applied to describing
equivalences between two Toeplitz kernels.


title:
Measuring finite-range phase coherence in an optical lattice using
  Talbot interferometry

abstract:
  One of the important goals of present research is to control and manipulate
coherence in a broad variety of systems, such as semiconductor spintronics,
biological photosynthetic systems, superconducting qubits and complex atomic
networks. Over the past decades interferometry of atoms and molecules has
proven to be a powerful tool to explore coherence. Here we demonstrate a
near-field interferometer based on the Talbot effect, which allows to measure
finite-range phase coherence of ultracold atoms in an optical lattice. We apply
this interferometer to study the build-up of phase coherence after a quantum
quench of a Bose-Einstein condensate residing in a one-dimensional optical
lattice. Our technique of measuring finite-range phase coherence is generic,
easy to adopt, and can be applied in practically all lattice experiments
without further modifications.


title: On the Graph of the Pedigree Polytope

abstract:
  Pedigree polytopes are extensions of the classical Symmetric Traveling
Salesman Problem polytopes whose graphs (1-skeletons) contain the TSP polytope
graphs as spanning subgraphs. While deciding adjacency of vertices in TSP
polytopes is coNP-complete, Arthanari has given a combinatorial (polynomially
decidable) characterization of adjacency in Pedigree polytopes. Based on this
characterization, we study the graphs of Pedigree polytopes asymptotically, for
large numbers of cities. Unlike TSP polytope graphs, which are vertex
transitive, Pedigree graphs are not even regular. Using an "adjacency game" to
handle Arthanari's intricate inductive characterization of adjacency, we prove
that the minimum degree is asymptotically equal to the number of vertices,
i.e., the graph is "asymptotically almost complete".


title: How Close to the Edge? Delay/utilization tradeoffs in MEC

abstract:
  Virtually all of the rapidly increasing data traffic consumed by mobile users
requires some kind of processing, normally performed at cloud servers. A recent
thrust, {\em mobile edge computing}, moves such processing to servers {\em
within} the cellular mobile network. The large temporal and spatial variations
to which mobile data usage is subject could make the reduced latency that edge
clouds offer come at an unacceptable cost in redundant and underutilized
infrastructure. We present some first empirical results on this question, based
on large scale sampled crowd-sourced traces from several major cities spanning
multiple operators and identifying the applications in use. We find
opportunities to obtain both high server utilization and low application
latency, but the best approaches will depend on the individual network
operator's deployment strategy and geographic specifics of the cities we study.


title: Mimicking the LCDM model with Stealths

abstract:
  We present a new cosmological model that mimics the Lambda Cold Dark Matter
by using a stealth field. This kind of field is characterized as not coupling
directly to gravity; however, it is connected to the underlying matter content
of the universe model. As is known, stealth fields do not back-react on the
space-time; however, their mimicry skills show how this field and its
self-interaction potential determines the cosmic evolution. We show the study
of the simplest model that can be developed with the stealth field.


title:
Weak continuity of risk functionals with applications to stochastic
  programming

abstract:
  Measuring and managing risk has become crucial in modern decision making
under stochastic uncertainty. In two-stage stochastic programming, mean risk
models are essentially defined by a parametric recourse problem and a
quantification of risk. From the perspective of qualitative robustness theory,
we discuss sufficient conditions for continuity of the resulting objective
functions with respect to perturbation of the underlying probability measure.
Our approach covers a fairly comprehensive class of both stochastic-programming
related risk measures and relevant recourse models. Not only this unifies
previous approaches but also extends known stability results for two-stage
stochastic programs to models with mixed-integer quadratic recourse and
mixed-integer convex recourse, respectively.


title: A Pointwise Lipschitz Selection Theorem

abstract:
  We prove that any correspondence (multi-function) mapping a metric space into
a Banach space that satisfies a certain pointwise Lipschitz condition, always
has a continuous selection that is pointwise Lipschitz on a dense set of its
domain.
  We apply our selection theorem to demonstrate a slight improvement to a
well-known version of the classical Bartle-Graves Theorem: Any continuous
linear surjection between infinite dimensional Banach spaces has a positively
homogeneous continuous right inverse that is pointwise Lipschitz on a dense
meager set of its domain.
  An example devised by Aharoni and Lindenstrauss shows that our pointwise
Lipschitz selection theorem is in some sense optimal: It is impossible to
improve our pointwise Lipschitz selection theorem to one that yields a
selection that is pointwise Lipschitz on the whole of its domain in general.


title:
Self-normalized deviation inequalities with application to
  $t$-statistics

abstract:
  Let $(\xi_i)_{i=1,...,n}$ be a sequence of independent and symmetric random
variables. We consider the upper bounds on tail probabilities of
self-normalized deviations $$ \mathbf{P} \Big( \max_{1\leq k \leq n}
\sum_{i=1}^{k} |\xi_i|\big/ \big(\sum_{i=1}^{n} |\xi_i|^\beta \big)^{1/\beta}
\geq x \Big) $$ for $x>0$ and $\beta >1.$ Our bound is the best that can be
obtained from the Bernstein inequality under the present assumption. An
application to Student's $t$-statistics is also given.


title: Th\'eor\`eme d'Eilenberg-Zilber en homologie cyclique enti\`ere

abstract:
  For simplicial modules, Eilenberg-Zilber's classical theorem states the
existence of a product $sh : M\otimes N\to M\times N$ (the shuffle) and a
coproduct $AW : M\times N\to M\otimes N$ (the Alexander-Whitney map), which are
quasi-inverse of eachother. A cyclic version of this theorem was established in
1987 by Hood and Jones: they proved that $sh$ and $AW$ admit "coextensions"
$sh_\infty$ and $AW_\infty$, using an acyclic-model method. Besides, an
explicit formula for $sh_\infty$ has been discovered by several authors. But
the question remained open of such an explicit formula for $AW_\infty$, and for
the homotopies by which $sh_\infty$ and $AW_\infty$ are mutual quasi-inverses
and are quasi-(co)-associative. We present a complete answer to this problem
and show that all these -- now explicit -- maps extend continuously to entire
cyclic complexes (associated to normed algebras).


title:
A Defect Corrected Finite Element Approach for the Accurate Evaluation
  of Magnetic Fields on Unstructured Grids

abstract:
  In electromagnetic simulations of magnets and machines one is often
interested in a highly accurate and local evaluation of the magnetic field
uniformity. Based on local post-processing of the solution, a defect correction
scheme is proposed as an easy to realize alternative to higher order finite
element or hybrid approaches. Radial basis functions (RBF)s are key for the
generality of the method, which in particular can handle unstructured grids.
Also, contrary to conventional finite element basis functions, higher
derivatives of the solution can be evaluated, as required, e.g., for deflection
magnets. Defect correction is applied to obtain a solution with improved
accuracy and adjoint techniques are used to estimate the remaining error for a
specific quantity of interest. Significantly improved (local) convergence
orders are obtained. The scheme is also applied to the simulation of a
Stern-Gerlach magnet currently in operation.


title:
Multifluid modeling of magnetosonic wave propagation in the solar
  chromosphere -- effects of impact ionization and radiative recombination

abstract:
  In order to study chromospheric magnetosonic wave propagation including, for
the first time, the effects of ion-neutral interactions in the partially
ionized solar chromosphere, we have developed a new multi-fluid computational
model, accounting for ionization and recombination reactions in gravitationally
stratified magnetized collisional media. The two-fluid model used in our 2D
numerical simulations treats neutrals as a separate fluid and considers charged
species (electrons and ions) within the resistive MHD approach with Coulomb
collisions and anisotropic heat flux determined by Braginskii's transport
coefficients. The electromagnetic fields are evolved according to the full
Maxwell equations and the solenoidality of the magnetic field is enforced with
a hyperbolic divergence cleaning scheme. The initial density and temperature
profiles are similar to VAL III chromospheric model in which dynamical, thermal
and chemical equilibrium are considered to ensure comparison to existing MHD
models and avoid artificial numerical heating. In this initial setup we include
simple homogeneous flux tube magnetic field configuration and an external
photospheric velocity driver to simulate the propagation of MHD waves in the
partially ionized reactive chromosphere. In particular, we investigate the loss
of chemical equilibrium and the plasma heating related to the steepening of
fast magnetosonic wave fronts in the gravitationally stratified medium.


title: Phase diagram of UCoGe

abstract:
  The temperature-pressure phase diagram of ferromagnetic superconductor UCoGe
includes four phase transitions. They are between the paramagnetic and the
ferromagnetic states with the subsequent transition in the superconducting
ferromagnetic state and between the normal and the superconducting states after
which has to occur the transition to the superconducting ferromagnetic state.
Here we have developed the Landau theory description of the phase diagram and
established the specific ordering arising at each type of transition.
  The phase transitions to the ferromagnetic superconducting state are
inevitably accompanied by the emergency of screening currents. The
corresponding magnetostatics considerations allow to establish the significant
difference between the transition from the ferromagnetic to the ferromagnetic
superconducting state and the transition from the superconducting to the
ferromagnetic superconducting state.


title: New ISR Cross Section Results on KS KL pi0 and KS KL pi0 pi0 From BABAR

abstract:
  We present preliminary measurements of the cross sections for e+e- --> KS KL
pi0 and KS KL pi0 pi0 obtained using the technique of Initial State Radiation
with 469 fb^-1 of e+e- collision data collected with the BABAR detector at or
near the Upsilon(4S) resonance. The resonant substructure of KS KL pi0 is
investigated, and branching fractions for the decays of the charmonium
resonances J/psi and psi(2S) into these final states are measured.


title: Magnetic impurities in spin-split superconductors

abstract:
  Hybrid semiconductor-superconductor quantum dot devices are tunable physical
realizations of quantum impurity models for a magnetic impurity in a
superconducting host. The binding energy of the localized sub-gap Shiba states
is set by the gate voltages and external magnetic field. In this work we
discuss the effects of the Zeeman spin splitting which is generically present
both in the quantum dot and in the (thin-film) superconductor. The unequal
$g$-factors in semiconductor and superconductor materials result in respective
Zeeman splittings of different magnitude. We consider both classical and
quantum impurities. In the first case we analytically study the spectral
function and the sub-gap states. The energy of bound states depends on the
spin-splitting of the Bogoliubov quasiparticle bands as a simple rigid shift.
For the case of collinear magnetization of impurity and host, the Shiba
resonance of a given spin polarization remains unperturbed when it overlaps
with the branch of the quasiparticle excitations of the opposite spin
polarization. In the quantum case, we employ numerical renormalization group
calculations to study the effect of the Zeeman field for different values of
the $g$-factors of the impurity and of the superconductor. We find that in
general the critical magnetic field for the singlet-doublet transition changes
non-monotonically as a function of the superconducting gap, demonstrating the
existence of two different transition mechanisms: Zeeman splitting of Shiba
states or gap closure due to Zeeman splitting of Bogoliubov states. We also
study how in the presence of spin-orbit coupling, modeled as an additional
non-collinear component of the magnetic field at the impurity site, the Shiba
resonance overlapping with the quasiparticle continuum of the opposite spin
gradually broadens and then merges with the continuum.


title:
Measurement of the $t$-channel single-top quark production cross section
  at 13 TeV with the CMS detector

abstract:
  The electroweak production of single-top quarks in the $t$ channel can be
changed by any deviation from the standard model, it is therefore an excellent
opportunity to search for new physics. In this poster the recent cross-section
measurement performed by the CMS collaboration is presented with the full 2015
dataset of the LHC Run II at a center-of-mass energy of 13 TeV. The cross
section and the top/antitop ratio is extracted using a binned maximum
likelihood fit to the distribution of a multivariate classifier in events
containing one isolated muon in the final state.


title: On the frequentist validity of Bayesian limits

abstract:
  To the frequentist who computes posteriors, not all priors are useful
asymptotically: in this paper Schwartz's 1965 Kullback-Leibler condition is
generalised to enable frequentist interpretation of convergence of posterior
distributions with the complex models and often dependent datasets in
present-day statistical applications. We prove four simple and fully general
frequentist theorems, for posterior consistency; for posterior rates of
convergence; for consistency of the Bayes factor in hypothesis testing or model
selection; and a theorem to obtain confidence sets from credible sets. The
latter has a significant methodological consequence in frequentist uncertainty
quantification: use of a suitable prior allows one to convert credible sets of
a calculated, simulated or approximated posterior into asymptotically
consistent confidence sets, in full generality. This extends the main
inferential implication of the Bernstein-von Mises theorem to non-parametric
models without smoothness conditions. Proofs require the existence of a
Bayesian type of test sequence and priors giving rise to local prior predictive
distributions that satisfy a weakened form of Le~Cam's contiguity with respect
to the data distribution. Results are applied in a wide range of examples and
counterexamples.


title:
Numerical estimate of the Kardar Parisi Zhang universality class in (2 +
  1) dimensions

abstract:
  We study the Restricted Solid on Solid model for surface growth in spatial
dimension $d=2$ by means of a multi-surface coding technique that allows to
produce a large number of samples of samples in the stationary regime in a
reasonable computational time. Thanks to: (i) a careful finite-size scaling
analysis of the critical exponents, (ii) the accurate estimate of the first
three moments of the height fluctuations, we can quantify the wandering
exponent with unprecedented precision: $\chi_{d=2} = 0.3869(4)$. This figure is
incompatible with the long-standing conjecture due to Kim and Koesterlitz that
hypothesized $\chi_{d=2}=2/5$.


title: The structure of Andromeda II dwarf spheroidal galaxy

abstract:
  We analyze in detail the spatial distribution and kinematic properties of two
different stellar populations in Andromeda II (And II) dwarf spheroidal galaxy.
We obtained their detailed surface density maps, together with their radial
density profiles. The two populations differ not only in age and metallicity,
but also in their spatial distribution and kinematics. Old stars ($\gtrsim 11$
Gyr) follow a round distribution well fitted by truncated density profiles.
These stars rotate around the projected optical major axis of the galaxy with
line-of-sight velocities $v_{los}(r_h) = 16 \pm 3$ km s$^{-1}$ and a velocity
gradient of $2.06 \pm 0.21$ km s$^{-1}$ arcmin$^{-1}$. Intermediate-age stars
($\lesssim 9$ Gyr) concentrate in the centre of the galaxy and form an
elongated structure extending along the projected optical major axis. This
structure appears to rotate with a velocity gradient of $2.24 \pm 0.22$ km
s$^{-1}$ arcmin$^{-1}$, and around the optical minor axis. The centres of
rotation and kinetic position angles (PA$_{\rm kin}$) of both populations
differ. For intermediate-age stars we obtained PA$_{\rm kin} = 18^\circ \pm
2^\circ$ and for the old ones PA$_{\rm kin} = 63^\circ \pm 3^\circ$ in good
agreement with photometric PA measured from isopleths fitted to the photometry.
We conclude that the two stellar populations may not be fully relaxed and thus
be the result of a merger occurred at redshift $z\sim 1.75$.


title: Effect of Co doping and hydrostatic pressure on SrFe2As2

abstract:
  We report a pressure study on electron doped SrFe$_{2-x}$Co$_x$As$_2$ by
electrical-resistivity ($\rho$) and magnetic-susceptibility ($\chi$)
experiments. Application of either external pressure or Co substitution rapidly
suppresses the spin-density wave ordering of the Fe moments and induces
superconductivity in SrFe$_2$As$_2$. At $x=0.2$ the broad superconducting (SC)
dome in the $T-p$ phase diagram exhibits its maximum $T_{c,{\rm max}}=20$ K at
a pressure of only $p_{\rm max}\approx 0.75$ GPa. In
SrFe$_{1.5}$Co$_{0.5}$As$_2$ no superconductivity is observed anymore up to 2.8
GPa. Upon increasing the Co concentration the maximum of the SC dome shifts
toward lower pressure accompanied by a decrease in the value of $T_{c,{\rm
max}}$. Even though, superconductivity is induced by both tuning methods, Co
substitution leads to a much more robust SC state. Our study evidences that in
SrFe$_{2-x}$Co$_x$As$_2$ both, the effect of pressure and Co-substitution, have
to be considered in order to understand the SC phase-diagram and further
attests the close relationship of SrFe$_2$As$_2$ and its sister compound
BaFe$_2$As$_2$.


title:
Nanoscale capillary freezing of ionic liquids confined between metallic
  interfaces and the role of electronic screening

abstract:
  Room temperature Ionic liquids (RTIL) received considerable attention as a
new class of materials with fundamental importance for energy storage
\cite{Armand2009, Uesugi2013} and active lubrication \cite{Palacio2010,
Dold2015, Smith2013a}. Their unique properties result from the competition of
strong electrostatic interactions with properly designed molecular structure to
avoid crystalization at room temperature. They are however unsual liquids,
which challenge fundamentally the classical frameworks of electrolytes. In
particular their behavior at electrified interfaces remains elusive with very
rich and exotic responses relevant to their electrochemical activity
\cite{Kornyshev2014,Merlet2012,Perkin2013,Atkin2009,Rotenberg2015,Endres2012,Bovio2009a,Bovio2009,Yokota2010}.
In this work, we use quartz tuning fork based AFM nanorheological measurements
to explore the properties of RTIL in nanometric confinement. We unveil a
dramatic change of the RTIL towards a solid-like phase below a threshold
thickness, pointing to a capillary freezing in confinement. This threshold
thickness is found to be intimately related to the metallic nature of the
confining materials, with more metallic surfaces facilitating capillary
freezing. This behavior is interpreted theoretically in terms of the shift of
the freezing transition, taking into account the influence of the electronic
screening on RTIL wetting of the confining surfaces, as described by the simple
Thomas-Fermi approach. Our findings provides fresh views on the properties of
confined RTIL with important implications for their statics and dynamics inside
nanoporous metallic structures. This also suggests applications to tune
nanoscale lubrication with the phase-changing RTIL, by varying the nature as
well as the patterning of the subtrate, and the application of active
polarisation.


title:
Improved analysis of the (O_7, O_7) contribution to $\bar{B} \rightarrow
  X_s \gamma \gamma$ at $O(\alpha_s)$

abstract:
  The present study is devoted for an improved analysis of the
self-interference contribution of the electromagnetic dipole operator O_7 to
the double differential decay width $d\Gamma/(ds_1 ds_2)$ for the inclusive
$\bar{B} \to X_s \gamma \gamma$ process, where the kinematical variables s_1
and s_2 are defined as s_i=(p_b - q_i)^2/m_b^2 with p_b, q_1, q_2 being the
momenta of the b-quark and two photons. This calculation completes the NLL QCD
prediction of the numerically important self-interference contribution of O_7
by keeping the full dependence on the strange-quark mass m_s, which is
introduced to control possible collinear configurations of one of the photons
with the strange quark. Our results are given for exact m_s, in contrast to an
earlier work where only logarithmic and constant terms in m_s were retained.
This improved NLL result for the (O_7, O_7)-interference contribution shows
that finite m_s effects are only sizable near the kinematical endpoints of the
spectrum $d\Gamma/(ds_1 ds_2)$. At the level of the branching ratio, in the
phase-space region considered in this paper, it is observed that $Br[\bar{B}
\to X_s \gamma \gamma]$ does not develop a sizable m_s dependence: the impact
on this branching ratio is less than 5% when m_s is varied between 400-600 MeV.
For the same phase-space region finite strange quark mass effects for the
branching ratio are less than 7%.


title:
Discriminating sterile neutrinos and unitarity violation with CP
  invariants

abstract:
  We present a new method to analyze upcoming results in the search for CP
violating neutrino oscillations. The CP violating amplitudes
$\mathcal{A}_{\alpha\beta}^{kj}$ provide parametrization independent
observables, which will be accessible by experiments soon. The strong
prediction of a unique $\mathcal{A}_{\alpha\beta}^{kj}$ (the Jarlskog
invariant) in case of the standard three neutrino model does not hold in models
with new physics beyond the Standard Model. Nevertheless there are still
correlations among the amplitudes depending on the specific model. Due to these
correlations it is possible to reject specific new physics models by
determining only 3 of the CP violating amplitudes.


title:
Box spaces of the free group that neither contain expanders nor embed
  into a Hilbert space

abstract:
  We construct box spaces of a free group that do not coarsely embed into a
Hilbert space, but do not contain coarsely embedded expanders. We do this by
considering two sequences of subgroups of the free group: one which gives rise
to a box space which forms an expander, and another which gives rise to a box
space that can be coarsely embedded into a Hilbert space. We then take certain
intersections of these subgroups, and prove that the corresponding box space
contains generalized expanders. We show that there are no coarsely embedded
expanders in the box space corresponding to our chosen sequence by proving that
a box space that covers another box space of the same group that is coarsely
embeddable into a Hilbert space cannot contain coarsely embedded expanders.


title: Continuous Time Random Walks for Non-Local Radial Solute Transport

abstract:
  This paper derives and analyzes continuous time random walk (CTRW) models in
radial flow geometries for the quantification of non-local solute transport
induced by heterogeneous flow distributions and by mobile-immobile mass
transfer processes. To this end we derive a general CTRW framework in radial
coordinates starting from the random walk equations for radial particle
positions and times. The particle density, or solute concentration is governed
by a non-local radial advection-dispersion equation (ADE). Unlike in CTRWs for
uniform flow scenarios, particle transition times here depend on the radial
particle position, which renders the CTRW non-stationary. As a consequence, the
memory kernel characterizing the non-local ADE, is radially dependent. Based on
this general formulation, we derive radial CTRW implementations that (i)
emulate non-local radial transport due to heterogeneous advection, (ii) model
multirate mass transfer (MRMT) between mobile and immobile continua, and (iii)
quantify both heterogeneous advection in a mobile region and mass transfer
between mobile and immobile regions. The expected solute breakthrough behavior
is studied using numerical random walk particle tracking simulations. This
behavior is analyzed by explicit analytical expressions for the asymptotic
solute breakthrough curves. We observe clear power-law tails of the solute
breakthrough for broad (power-law) distributions of particle transit times
(heterogeneous advection) and particle trapping times (MRMT model). The
combined model displays two distinct time regimes. An intermediate regime, in
which the solute breakthrough is dominated by the particle transit times in the
mobile zones, and a late time regime that is governed by the distribution of
particle trapping times in immobile zones.


title: Confinement effects on the nuclear spin isomer conversion of H$_2$O

abstract:
  The mechanism for interconversion between the nuclear spin isomers (NSI) of
H$_2$O remains shrouded in uncertainties. The temperature dependence displayed
by NSI interconversion rates for H$_2$O isolated in an Argon matrix provides
evidence that confinement effects are responsible for the dramatic increase in
their kinetics with respect to the gas phase, providing new pathways for
o-H$_2$O $\leftrightarrow$ p-H$_2$O conversion in endohedral compounds. This
reveals intramolecular aspects of the interconversion mechanism which may
improve methodologies for the separation and storage of NSI en route to
applications in nuclear magnetic resonance spectroscopy and imaging. It may
also improve astronomers' ability to use their relative abundance in the
interstellar medium as proxies, thereby providing a valuable "astronomical
clock".


title: Central Stars of Planetary Nebulae

abstract:
  In this brief invited review, I will attempt to summarise some of the key
areas of interest in the study of central stars of planetary nebulae which
(probably) won't be covered by other speakers' proceedings. The main focus
will, inevitably, be on the subject of multiplicity, with special emphasis on
recent results regarding triple central star systems as well as wide binaries
which avoid a common-envelope phase. Furthermore, in light of the upcoming
release of Kepler's Campaign 11 data, I will discuss a few of the prospects
from that data including the unique possibility to detect merger products.


title:
Microstructural and transport properties of superconducting
  FeTe0.65Se0.35 crystals

abstract:
  The issue concerning the nature and the role of microstructural
inhomogeneities in iron chalcogenide superconducting crystals of FeTe0.65Se0.35
and their correlation with transport properties of this system was addressed.
Presented data demonstrate that chemical disorder originating from the kinetics
of the crystal growth process significantly influences the superconducting
properties of an Fe-Te-Se system. Transport measurements of the transition
temperature and critical current density performed for microscopic bridges
allow us to deduce the local properties of a superconductor with
microstructural inhomogeneities, and significant differences were noted. The
variances observed in the local properties were explained as a consequence of
weak superconducting links existing in the studied crystals. The results
confirm that inhomogeneous spatial distribution of ions and small hexagonal
symmetry nanoscale regions with nanoscale phase separation also seem to enhance
the superconductivity in this system with respect to the values of the critical
current density. Magnetic measurements confirm the conclusions drawn from the
transport measurements.


title: Numerical simulations of necklaces in SU(2) gauge-Higgs field theory

abstract:
  We perform the first numerical simulations of necklaces in a non-Abelian
gauge theory. Necklaces are composite classical solutions which can be
interpreted as monopoles trapped on strings, rather generic structures in a
Grand Unified Theory. We generate necklaces from random initial conditions,
modelling a phase transition in the early Universe, and study the evolution.
For all cases, we find that the necklace system shows scaling behaviour similar
to that of a network of ordinary cosmic strings. Furthermore, our simulations
indicate that comoving distance between the monopoles or semipoles along the
string asymptotes to a constant value at late times. This means that while the
monopole-to-string energy density ratio decreases as the inverse of the scale
factor, a horizon-size length of string has a large number of monopoles,
significantly affecting the dynamics of string loops. We argue that
gravitational wave bounds from millisecond pulsar timing on the string tension
in the Nambu-Goto scenario are greatly relaxed.


title:
$\eta$-$\gamma$ and $\eta'$-$\gamma$ transition form factors in a
  nonlocal NJL model

abstract:
  We study the $\eta$ and $\eta'$ distribution amplitudes (DAs) in the context
of a nonlocal SU(3)_L x SU(3)_R chiral quark model. The corresponding
Lagrangian allows to reproduce the phenomenological values of pseudoscalar
meson masses and decay constants, as well as the momentum dependence of the
quark propagator arising from lattice calculations. It is found that the
obtained DAs have two symmetric maxima, which arise from new contributions
generated by the nonlocal character of the interactions. These DAs are then
applied to the calculation of the $\eta$-$\gamma$ and $\eta'$-$\gamma$
transition form factors. Implications of our results regarding higher twist
corrections and/or contributions to the transition form factors originated by
gluon-gluon components in the $\eta$ and $\eta'$ mesons are discussed.


title:
Measuring baryon acoustic oscillations with angular two-point
  correlation function

abstract:
  The Baryon Acoustic Oscillations (BAO) imprinted a characteristic correlation
length in the large-scale structure of the universe that can be used as a
standard ruler for mapping out the cosmic expansion history. Here, we discuss
the application of the angular two-point correlation function, $w(\theta)$, to
a sample of luminous red galaxies of the Sloan Digital Sky Survey (SDSS) and
derive two new measurements of the BAO angular scale at $z = 0.235$ and $z =
0.365$. Since noise and systematics may hinder the identification of the BAO
signature in the $w - \theta$ plane, we also introduce a potential new method
to localize the acoustic bump in a model-independent way. We use these new
measurements along with previous data to constrain cosmological parameters of
dark energy models and to derive a new estimate of the acoustic scale $r_s$.


title: Neural Machine Translation with Latent Semantic of Image and Text

abstract:
  Although attention-based Neural Machine Translation have achieved great
success, attention-mechanism cannot capture the entire meaning of the source
sentence because the attention mechanism generates a target word depending
heavily on the relevant parts of the source sentence. The report of earlier
studies has introduced a latent variable to capture the entire meaning of
sentence and achieved improvement on attention-based Neural Machine
Translation. We follow this approach and we believe that the capturing meaning
of sentence benefits from image information because human beings understand the
meaning of language not only from textual information but also from perceptual
information such as that gained from vision. As described herein, we propose a
neural machine translation model that introduces a continuous latent variable
containing an underlying semantic extracted from texts and images. Our model,
which can be trained end-to-end, requires image information only when training.
Experiments conducted with an English--German translation task show that our
model outperforms over the baseline.


title: Constraints on $L_\mu-L_\tau$ Gauge Interactions from Rare Kaon Decay

abstract:
  A model with $L_{\mu} -L_{\tau}$ gauge symmetry is the least constrained
model as a resolution to the disagreement of the muon anomalous magnetic moment
between the theoretical predictions and the experimental results. In this
paper, we discuss how well the $L_{\mu} - L_{\tau}$ model can be constrained by
looking for decays of the charged kaon associated with a $L_{\mu}-L_{\tau}$
gauge boson. More concretely, we consider searches for single muon tracks from
the decays of stopped charged kaon as in the E949 experiment. In our
conservative estimation, we find that the favored parameter region for the muon
anomalous magnetic moment can be tested by using a $10$ times larger number of
the stopped charged kaons and about a $100$ times better photon rejection rate
than the E949 experiment.


title: Discriminative Correlation Filter with Channel and Spatial Reliability

abstract:
  Short-term tracking is an open and challenging problem for which
discriminative correlation filters (DCF) have shown excellent performance. We
introduce the channel and spatial reliability concepts to DCF tracking and
provide a novel learning algorithm for its efficient and seamless integration
in the filter update and the tracking process. The spatial reliability map
adjusts the filter support to the part of the object suitable for tracking.
This both allows to enlarge the search region and improves tracking of
non-rectangular objects. Reliability scores reflect channel-wise quality of the
learned filters and are used as feature weighting coefficients in localization.
Experimentally, with only two simple standard features, HoGs and Colornames,
the novel CSR-DCF method -- DCF with Channel and Spatial Reliability --
achieves state-of-the-art results on VOT 2016, VOT 2015 and OTB100. The CSR-DCF
runs in real-time on a CPU.


title: Axiomatizability of the stable rank of C*-algebras

abstract:
  We show that the class of C*-algebras with stable rank greater than a given
positive integer is axiomatizable in logic of metric structures. As a
consequence we show that the stable rank is continuous with respect to forming
ultrapowers of C*-algebras, and that stable rank is Kadison--Kastler stable.


title:
Cavity-induced generation of non-trivial topological states in a
  two-dimensional Fermi gas

abstract:
  We propose how topologically non-trivial states can dynamically organize in a
fermionic quantum gas which is confined to a two-dimensional optical lattice
potential and coupled to the field of an optical cavity. The spontaneously
emerging cavity field induces together with coherent pump laser fields a
dynamical gauge field for the atoms. Upon adiabatic elimination of the cavity
degree of freedom, the system is described by an effective Hofstadter model
with a self-consistency condition which determines the tunneling amplitude
along the cavity direction. The fermions are found to self-organize into
topologically non-trivial states which carry an extended edge state for a
finite system size. Due to the dissipative nature of the cavity field, the
topological steady states are protected from external perturbations.


title:
On some multivariate Sarmanov mixed Erlang reinsurance risks:
  aggregation and capital allocation

abstract:
  Following some recent works on risk aggregation and capital allocation for
mixed Erlang risks joined by Sarmanov's multivariate distribution, in this
paper we present some closed-form formulas for the same topic by considering,
however, a different kernel function for Sarmanov's distribution, not
previously studied in this context. The risk aggregation and capital allocation
formulas are derived and numerically illustrated in the general framework of
stop-loss reinsurance, and then in the particular case with no stop-loss
reinsurance. A discussion of the dependency structure of the considered
distribution, based on Pearson's correlation coefficient, is also presented for
different kernel functions and illustrated in the bivariate case.


title:
Multi-rate mass transfer modeling of two-phase flow in highly
  heterogeneous fractured and porous media

abstract:
  We study modeling of two-phase flow in highly heterogeneous fractured and
porous media. The flow behaviour is strongly influenced by mass transfer
between a highly permeable (mobile) fracture domain and less permeable
(immobile) matrix blocks. We quantify the effective two-phase flow behaviour
using a multirate rate mass transfer (MRMT) approach. We discuss the range of
applicability of the MRMT approach in terms of the pertinent viscous and
capillary diffusion time scales. We scrutinize the linearization of capillary
diffusion in the immobile regions, which allows for the formulation of MRMT in
the form of a non-local single equation model. The global memory function,
which encodes mass transfer between the mobile and the immobile regions, is at
the center of this method. We propose two methods to estimate the global memory
function for a fracture network with given fracture and matrix geometry. Both
employ a scaling approach based on the known local memory function for a given
immobile region. With the first method, the local memory function is calculated
numerically, while the second one employs a parametric memory function in form
of truncated power-law. The developed concepts are applied and tested for
fracture networks of different complexity. We find that both physically based
parameter estimation methods for the global memory function provide predictive
MRMT approaches for the description of multiphase flow in highly heterogeneous
porous media.


title: Algebraic K-theory and descent for blow-ups

abstract:
  We prove that algebraic K-theory satisfies `pro-descent' for abstract blow-up
squares of noetherian schemes. As an application we derive Weibel's conjecture
on the vanishing of negative K-groups.


title:
The design strategy of scientific data quality control software for
  Euclid mission

abstract:
  The most valuable asset of a space mission like Euclid are the data. Due to
their huge volume, the automatic quality control becomes a crucial aspect over
the entire lifetime of the experiment. Here we focus on the design strategy for
the Science Ground Segment (SGS) Data Quality Common Tools (DQCT), which has
the main role to provide software solutions to gather, evaluate, and record
quality information about the raw and derived data products from a primarily
scientific perspective. The SGS DQCT will provide a quantitative basis for
evaluating the application of reduction and calibration reference data, as well
as diagnostic tools for quality parameters, flags, trend analysis diagrams and
any other metadata parameter produced by the pipeline. In a large programme
like Euclid, it is prohibitively expensive to process large amount of data at
the pixel level just for the purpose of quality evaluation. Thus, all measures
of quality at the pixel level are implemented in the individual pipeline
stages, and passed along as metadata in the production. In this sense most of
the tasks related to science data quality are delegated to the pipeline stages,
even though the responsibility for science data quality is managed at a higher
level. The DQCT subsystem of the SGS is currently under development, but its
path to full realization will likely be different than that of other
subsystems. Primarily because, due to a high level of parallelism and to the
wide pipeline processing redundancy, for instance the mechanism of double
Science Data Center for each processing function, the data quality tools have
not only to be widely spread over all pipeline segments and data levels, but
also to minimize the occurrences of potential diversity of solutions
implemented for similar functions, ensuring the maximum of coherency and
standardization for quality evaluation and reporting in the SGS.


title: Fuzzy Euclidean wormholes in de Sitter space

abstract:
  We investigate Euclidean wormholes in Einstein gravity with a massless scalar
field in de Sitter space. Euclidean wormholes are possible due to the analytic
continuation of the time as well as complexification of fields, where we need
to impose the classicality after the Wick-rotation to the Lorentzian
signatures. For some parameters, wormholes are preferred than Hawking-Moss
instantons, and hence wormholes can be more fundamental than Hawking-Moss type
instantons. Euclidean wormholes can be interpreted in three ways: (1) classical
big bounce, (2) either tunneling from a small to a large universe or a creation
of a collapsing and an expanding universe from nothing, and (3) either a
transition from a contracting to a bouncing phase or a creation of two
expanding universes from nothing. These various interpretations shed some light
on challenges of singularities. In addition, these will help to understand
tensions between various kinds of quantum gravity theories.


title: Biwarped product submanifolds of a K\"{a}hler manifold

abstract:
  We study biwarped product submanifolds which are special cases of multiply
warped product submanifolds in K\"{a}hler manifolds. We observe the
non-existence of such submanifolds under some circumstances. We show that there
exists a non-trivial biwarped product submanifold of a certain type by giving
an illustrate example. We also give a necessary and sufficient condition for
such submanifolds to be locally trivial. Moreover, we establish an inequality
for the squared norm of the second fundamental form in terms of the warping
functions for such submanifolds. The equality case is also discussed.


title: Representation theory of quantized Gieseker varieties, I

abstract:
  We study the representation theory of quantizations of Gieseker moduli
spaces. We describe the categories of finite dimensional representations for
all parameters and categories O for special values of parameters. We find the
values of parameters, where the quantizations have finite homological
dimension, and establish abelian localization theorem. We describe the
two-sided ideals. Finally, we determine annihilators of the irreducible objects
in categories O for some special choices of one-parameter subgroups.


title:
Controlling heat and particle currents in nanodevices by quantum
  observation

abstract:
  We demonstrate that in a standard thermo-electric nanodevice the current and
heat flows are not only dictated by the temperature and potential gradient, but
also by the external action of a local quantum observer that controls the
coherence of the device. Depending on how and where the observation takes
place, the direction of heat and particle currents can be independently
controlled. In fact, we show that the current and heat flow in a quantum
material can go against the natural temperature and voltage gradients.
Dynamical quantum observation offers new possibilities for the control of
quantum transport far beyond classical thermal reservoirs. Through the concept
of local projections, we illustrate how we can create and directionality
control the injection of currents (electronic and heat) in nanodevices. This
scheme provides novel strategies to construct quantum devices with application
in thermoelectrics, spintronic injection, phononics, and sensing among others.
In particular, highly efficient and selective spin injection might be achieved
by local spin projection techniques.


title: Multimodal Latent Variable Analysis

abstract:
  Consider a set of multiple, multimodal sensors capturing a complex system or
a physical phenomenon of interest. Our primary goal is to distinguish the
underlying sources of variability manifested in the measured data. The first
step in our analysis is to find the common source of variability present in all
sensor measurements. We base our work on a recent paper, which tackles this
problem with alternating diffusion (AD). In this work, we suggest to further
the analysis by extracting the sensor-specific variables in addition to the
common source. We propose an algorithm, which we analyze theoretically, and
then demonstrate on three different applications: a synthetic example, a toy
problem, and the task of fetal ECG extraction.


title: A reciprocity law and the skew Pieri rule for the symplectic group

abstract:
  We use the theory of skew duality to show that decomposing the tensor product
of $k$ irreducible representations of the symplectic group $Sp_{2m} =
Sp_{2m}(C)$ is equivalent to branching from $Sp_{2n}$ to
$Sp_{2n_1}\times\cdots\times Sp_{2n_k}$ where $n, n_1,\ldots, n_k$ are positive
integers such that $n = n_1+\cdots+n_k$ and the $n_j$'s depend on $m$ as well
as the representations in the tensor product. Using this result and a work of
J. Lepowsky, we obtain a skew Pieri rule for $Sp_{2m}$, i.e., a description of
the irreducible decomposition of the tensor product of an irreducible
representation of the symplectic group $Sp_{2m}$ with a fundamental
representation.


title: Torsion Gravity for Dirac Particles

abstract:
  In this paper we consider torsion gravity in the case of the Dirac field, and
by going into the rest frame we study what happens when a uniform precession as
well as a phase are taken into account for the spinor field; we discuss how
partially conserved axial-vector currents and torsion-spin attractive
potentials justify negative Takabayashi angle and energy smaller than mass:
because in this instance the module goes to zero exponentially fast then we
obtain stable and localized matter distributions suitable to be regarded as a
description of particles.


title: Leading order relativistic chiral nucleon-nucleon interaction

abstract:
  Motivated by the successes of relativistic theories in studies of
atomic/molecular and nuclear systems and the need for a relativistic chiral
force in relativistic nuclear structure studies, we explore a new relativistic
scheme to construct the nucleon-nucleon interaction in the framework of
covariant chiral effective field theory. The chiral interaction is formulated
up to leading order with covariant power counting and a Lorentz invariant
chiral Lagrangian. We find that the relativistic scheme induces all six spin
operators needed to describe the nuclear force. A detailed investigation of the
partial wave potentials shows a better description of the $^1S_0$ and $^3P_0$
phase shifts than the leading order Weinberg approach, and similar to that of
the next-to-leading order Weinberg approach. For the other partial waves with
angular momenta $J\geq 1$, the relativistic results are almost the same as
their leading order non-relativistic counterparts.


title:
Do Dynamical Excitonic Liquid Correlations Mediate Superconductivity in
  Elemental Bismuth?

abstract:
  Motivated by the remarkable discovery of superconductivity in elemental
Bismuth, we study its normal state in detail using a combination of
tight-binding (TB) and-structural supplemented by dynamical mean-field theory
(DMFT). We show that a two-fluid model composed of preformed and dynamically
fluctuating excitons coupled to a tiny number of carriers provides a unified
rationalization of a range of ill-understood normal state spectral and
transport data. Based on these, we propose that resonant scattering involving a
very low density of renormalized carriers and the excitonic liquid drives
logarithmic enhancement of vertex corrections, boosting superconductivity in
$Bi$. A confirmatory test for our proposal would be the experimental
verification of an excitonic semiconductor with electronic nematicity as a
`competing order' on inducing a semi-metal-to semiconductor transition in $Bi$
by an external perturbation like pressure.


title: Finiteness of hyperelliptic and superelliptic curves with CM Jacobians

abstract:
  In this paper we study the Coleman-Oort conjecture for superelliptic curves,
i.e., curves defined by affine equations $y^n=F(x)$ with $F$ a separable
polynomial. We prove that up to isomorphism there are at most finitely many
superelliptic curves of fixed genus $g\geq 8$ with CM Jacobians. The proof
relies on the geometric structures of Shimura subvarieties in Siegel modular
varieties and the stability properties of Higgs bundles associated to fibred
surfaces.


title:
Global well-posedness of three-dimensional Navier-Stokes equations with
  partial viscosity under helical symmetry

abstract:
  In this paper, we investigate the global well-posedness of three-dimensional
Navier-Stokes equations with horizontal viscosity under a special symmetric
structure: helical symmetry. More precisely, by a revised Ladyzhenskaya-type
inequality and utilizing the behavior of helical flow, we prove the global
existence and uniqueness of weak and strong solution to the three-dimensional
helical flows. Our result reveals that for the issue of global well-posedness
of the viscous helical fluids, the horizontal viscosity plays the important
role. To some extent, our work can be seen as a generalization of the result by
Mahalov-Titi-Leibovich [Arch. Ration. Mech. Anal. 112 (1990), no. 3, 193-222].


title:
Critical Charge in Gapped Graphene: the role of the screening of the
  interaction potential by $\sigma$-orbitals

abstract:
  Due to its unique structure, graphene provides a condensed-matter model of
particle physics phenomena. One is the critical charge which is highly
interested. The investigation of critical charge in gapped graphene is
performed within single particle approach by means of Dirac equation
integration. The screened Coulomb interaction between charged defect and
graphene electron excitations is investigated. Two kinds of mass gap generation
and various values of substrate dielectric permittivities are considered. It is
shown that the critical charge phenomenon can be observed even with quite small
charges for physically motivated parameters.


title: Distributed Optimization of Multi-Class SVMs

abstract:
  Training of one-vs.-rest SVMs can be parallelized over the number of classes
in a straight forward way. Given enough computational resources, one-vs.-rest
SVMs can thus be trained on data involving a large number of classes. The same
cannot be stated, however, for the so-called all-in-one SVMs, which require
solving a quadratic program of size quadratically in the number of classes. We
develop distributed algorithms for two all-in-one SVM formulations (Lee et al.
and Weston and Watkins) that parallelize the computation evenly over the number
of classes. This allows us to compare these models to one-vs.-rest SVMs on
unprecedented scale. The results indicate superior accuracy on text
classification data.


title: GuessWhat?! Visual object discovery through multi-modal dialogue

abstract:
  We introduce GuessWhat?!, a two-player guessing game as a testbed for
research on the interplay of computer vision and dialogue systems. The goal of
the game is to locate an unknown object in a rich image scene by asking a
sequence of questions. Higher-level image understanding, like spatial reasoning
and language grounding, is required to solve the proposed task. Our key
contribution is the collection of a large-scale dataset consisting of 150K
human-played games with a total of 800K visual question-answer pairs on 66K
images. We explain our design decisions in collecting the dataset and introduce
the oracle and questioner tasks that are associated with the two players of the
game. We prototyped deep learning models to establish initial baselines of the
introduced tasks.


title:
A Two-Soliton with Transient Turbulent Regime for the Cubic Half-wave
  Equation on The Real Line

abstract:
  We consider the focusing cubic half-wave equation on the real line $$i
\partial_t u + |D| u = |u|^2 u, \ \ \widehat{|D|u}(\xi)=|\xi|\hat{u}(\xi), \ \
(t,x)\in \Bbb R_+\times \Bbb R.$$ We construct an asymptotic global-in-time
compact two-soliton solution with arbitrarily small $L^2$-norm which exhibits
the following two regimes: (i) a transient turbulent regime characterized by a
dramatic and explicit growth of its $H^1$-norm on a finite time interval,
followed by (ii) a saturation regime in which the $H^1$-norm remains stationary
large forever in time.


title: On the Exponentially Weighted Aggregate with the Laplace Prior

abstract:
  In this paper, we study the statistical behaviour of the Exponentially
Weighted Aggregate (EWA) in the problem of high-dimensional regression with
fixed design. Under the assumption that the underlying regression vector is
sparse, it is reasonable to use the Laplace distribution as a prior. The
resulting estimator and, specifically, a particular instance of it referred to
as the Bayesian lasso, was already used in the statistical literature because
of its computational convenience, even though no thorough mathematical analysis
of its statistical properties was carried out. The present work fills this gap
by establishing sharp oracle inequalities for the EWA with the Laplace prior.
These inequalities show that if the temperature parameter is small, the EWA
with the Laplace prior satisfies the same type of oracle inequality as the
lasso estimator does, as long as the quality of estimation is measured by the
prediction loss. Extensions of the proposed methodology to the problem of
prediction with low-rank matrices are considered.


title: Vertex-centred Method to Detect Communities in Evolving Networks

abstract:
  Finding communities in evolving networks is a difficult task and raises
issues different from the classic static detection case. We introduce an
approach based on the recent vertex-centred paradigm. The proposed algorithm,
named DynLOCNeSs, detects communities by scanning and evaluating each vertex
neighbourhood, which can be done independently in a parallel way. It is done by
means of a preference measure, using these preferences to handle community
changes. We also introduce a new vertex neighbourhood preference measure, CWCN,
more efficient than current existing ones in the considered context.
Experimental results show the relevance of this measure and the ability of the
proposed approach to detect classical community evolution patterns such as
grow-shrink and merge-split.


title: Poisson Cohomology of holomorphic toric Poisson manifolds. I

abstract:
  A holomorphic toric Poisson manifold is a nonsingular toric variety equipped
with a holomorphic Poisson structure, which is invariant under the torus
action. In this paper, we computed the Poisson cohomology groups for all
holomorphic toric Poisson structures on $CP^n$, with the stand Poisson
structure on $CP^n$ as a special case. We also computed the algebraic and the
formal Poisson cohomology groups of holomorphic toric Poisson structures on
$C^n$.


title: Crossed-Product Extensions of $L_p$-Bounds for Amenable Actions

abstract:
  We will extend earlier transference results of Neuwirth and Ricard from the
context of noncommutative $L_p$-spaces associated with amenable groups to that
of noncommutative $L_p$-spaces over crossed products of amenable and
trace-preserving actions. Namely, if $T_m:L_p(\mathcal{L} G) \rightarrow
L_p(\mathcal{L} G)$ is a completely bounded Fourier multiplier, where
$\mathcal{L} G \subset \mathcal{B}(L_2 G)$ is the von Neumann algebra of $G$,
we will see that $\mathrm{Id} \rtimes T_m: L_p(\mathcal{M} \rtimes_\theta G)
\rightarrow L_p(\mathcal{M} \rtimes_\theta G)$ is also completely bounded and
that $$
  \| \mathrm{Id} \rtimes T_m: L_p(\mathcal{M} \rtimes_\theta G) \rightarrow
L_p(\mathcal{M} \rtimes_\theta G) \|_{\mathrm{cb}} \leq \| T_m \|_{\mathrm{cb}}
$$ provided that $\theta$ is amenable and trace-preserving. Furthermore, our
construction allow to extend $G$-equivariant completely bounded operators $S:
L_p(\mathcal{M}) \rightarrow L_p(\mathcal{M})$ to the crossed-product, so that
$$
  \|S \rtimes \mathrm{Id}: L_p(\mathcal{M} \rtimes_\theta G) \rightarrow
L_p(\mathcal{M} \rtimes_\theta G) \|_{\mathrm{cb}} \leq C^\frac{1}{p} \, \| S
\|_{\mathrm{cb}} $$ whenever $\theta$ is trace-preserving, amenable and its
generalized F{\o}lner sets satisfy certain accretivity property measured by the
constant $1 \leq C$. As a corollary, we will obtain stability results for
maximal $L_p$-bounds over crossed products. Such results imply the stability of
certain assumptions recently used to prove a noncommutative generalization of
the spectral H\"omander-Mikhlin theorem.


title:
Pure and Stationary Optimal Strategies in Perfect-Information Stochastic
  Games with Global Preferences

abstract:
  We examine the problem of the existence of optimal deterministic stationary
strategiesintwo-players antagonistic (zero-sum) perfect information stochastic
games with finitely many states and actions.We show that the existenceof such
strategies follows from the existence of optimal deterministic
stationarystrategies for some derived one-player games.Thus we reducethe
problem from two-player to one-player games (Markov decisionproblems), where
usually it is much easier to tackle.The reduction is very general, it holds not
only for all possible payoff mappings but alsoin more a general situations
whereplayers' preferences are not expressed by payoffs.


title: Observing expansive maps

abstract:
  We consider the problem of the observability of positively expansive maps by
the time series associated to continuous real functions. For this purpose we
prove a general result on the generic observability of a locally injective map
of a compact metric space of finite topological dimension, extending earlier
work by Gutman [6]. We apply this result to partially solve the problem of
finding the minimal number of functions needed to observe a positively
expansive map. We prove that two functions are necessary and sufficient for
positively expansive maps on tori.