title:
Formation of buried conductive micro-channels in single crystal diamond
  with MeV C and He implantation

abstract:
  As demonstrated in previous works, implantation with a MeV ion microbeam
through masks with graded thickness allows the formation of conductive
micro-channels in diamond which are embedded in the insulating matrix at
controllable depths [P. Olivero et al., Diamond Relat. Mater. 18 (5-8), 870-876
(2009)]. In the present work we report about the systematic electrical
characterization of such micro-channels as a function of several implantation
conditions, namely: ion species and energy, implantation fluence. The
current-voltage (IV) characteristics of the buried channels were measured at
room temperature with a two point probe station. Significant parameters such as
the sheet resistance and the characteristic exponent (alpha) of the IV
power-law trend were expressed as a function of damage density, with
satisfactory compatibility between the results obtained in different
implantation conditions.


title: Matched-filtering Line Search Methods Applied to Suzaku Data

abstract:
  A detailed search for emission and absorption lines and assessing their upper
limits are performed for Suzaku data. The method utilizes a matched-filtering
approach to maximize the signal-to-noise ratio for a given energy resolution,
which could be applicable to many types of line search. We first applied it to
well-known AGN spectra that have been reported to have ultra-fast outflows, and
find that our results are consistent with previous findings at the ~3{\sigma}
level. We proceeded to search for emission and absorption features in the two
bright magnetars 4U 0142+61 and 1RXS J1708-4009, applying the filtering method
to Suzaku data. We found that neither source showed any significant indication
of line features, even using long Suzaku observations and dividing their
spectra into spin phases. The upper limits on the equivalent width of
emission/absorption lines are constrained to be a few eV at ~1 keV, and a few
hundreds of eV at ~10 keV. This strengthens previous reports that persistently
bright magnetars do not show proton cyclotron absorption features in soft
X-rays and, even if they exist, they would be broadened or much weaker than
below the detection limit of X-ray CCD.


title:
The Planck Blackbody Spectrum Follows from the Structure of Relativistic
  Spacetime

abstract:
  Here we show that within classical physics, the Planck blackbody spectrum can
be derived directly from the structure of relativistic spacetime. In
noninertial frames, thermal radiation at positive temperature is connected
directly to zero-point radiation whose spectrum follows from the geodesic
structure of the spacetime. The connection between zero-point radiation and
thermal radiation at postive temperature is through a time-dilating conformal
transformation in the noninertial frame. Transferring the spectrum back to
Minskowski spacetime, the Planck spectrum is obtained.


title: Pressure effect on superconductivity in FeSe0.5Te0.5

abstract:
  Due to the simple layered structure, isostructural FeSe and FeSe0.5Te0.5 are
clue compounds for understanding the principal mechanisms of superconductivity
in the family of Fe-based superconductors. High-pressure magnetic, structural
and M\"ossbauer studies have been performed on single-crystalline samples of
superconducting FeSe0.5Te0.5 with Tc = 13.5 K. Susceptibility data have
revealed a strong increase of Tc up to 19.5 K for pressures up to 1.3 GPa,
followed by a plateau in the Tc(p) dependence up to 5.0 GPa. Further pressure
increase leads to a disappearance of the superconducting state around 7.0 GPa.
X-ray diffraction and M\"ossbauer studies explain this fact by a
tetragonal-to-hexagonal structural phase transition. M\"ossbauer parameters of
the non-superconducting high-pressure phase indicate less covalency of Fe-Se
bonds. Based on structural and susceptibility data we conclude about a common
character of Tc(p) diagrams for both FeSe and FeSe0.5Te0.5 superconductors.


title: Finite homogeneous effect algebras with trivial sharp elements

abstract:
  In this paper we describe finite homogeneous effect algebras whose sharp
elements are only $0$ and $1$.


title:
Well-posedness of nolinear fractional Schr\"odinger and wave equations
  in Sobolev spaces

abstract:
  We prove the well-posed results in sub-critical and critical cases for the
pure power-type nonlinear fractional Schr\"odinger equations on $\mathbb{R}^d$.
These results extend the previous ones in \cite{HongSire} for $\sigma\geq 2$.
This covers the well-known result for the Schr\"odinger equation $\sigma = 2$
given in \cite{CazenaveWeissler}. In the case $\sigma \in (0,2)\backslash
\{1\}$, we give the local well-posedness in sub-critical case for all exponent
$\nu > 1$ in contrast of ones in \cite{HongSire}. This also generalizes the
ones of \cite{ChoHwangKwonLee} when $d = 1$ and of \cite{GuoHuo} when $d \geq
2$ where the authors considered the cubic fractional Schr\"odinger equation
with $\sigma\in (1,2)$. We also give the global existence in energy space under
some assumptions. We finally prove the local well-posedness in sub-critical and
critical cases for the pure power-type nonlinear fractional wave equations.


title: NanoSQUIDs: Basics & recent advances

abstract:
  Superconducting Quantum Interference Devices (SQUIDs) are one of the most
popular devices in superconducting electronics. They combine the Josephson
effect with the quantization of magnetic flux in superconductors. This gives
rise to one of the most beautiful manifestations of macroscopic quantum
coherence in the solid state. In addition, SQUIDs are extremely sensitive
sensors allowing to transduce magnetic flux into measurable electric signals.
As a consequence, any physical observable that can be converted into magnetic
flux, e.g., current, magnetization, magnetic field or position, becomes easily
accessible to SQUID sensors. In the late 1980's it became clear that downsizing
the dimensions of SQUIDs to the nanometric scale would encompass an enormous
increase of their sensitivity to localized tiny magnetic signals. Indeed,
nanoSQUIDs opened the way to the investigation of, e.g., individual magnetic
nanoparticles or surface magnetic states with unprecedented sensitivities. The
purpose of this review is to present a detailed survey of microscopic and
nanoscopic SQUID sensors. We will start by discussing the principle of
operation of SQUIDs, placing the emphasis on their application as
ultrasensitive detectors for small localized magnetic signals. We will continue
by reviewing a number of existing devices based on different kinds of Josephson
junctions and materials, focusing on their advantages and drawbacks. The last
sections are left for applications of nanoSQUIDs in the fields of scanning
SQUID microscopy and magnetic particle characterization, putting special stress
on the investigation of individual magnetic nanoparticles.


title: A transportable optical lattice clock with $7\times10^{-17}$ uncertainty

abstract:
  We present a transportable optical clock (TOC) with $^{87}$Sr. Its complete
characterization against a stationary lattice clock resulted in a systematic
uncertainty of ${7.4 \times 10^{-17}}$ which is currently limited by the
statistics of the determination of the residual lattice light shift. The
measurements confirm that the systematic uncertainty is reduceable to below the
design goal of $1 \times 10^{-17}$. The instability of our TOC is $1.3 \times
10^{-15}/\sqrt{(\tau/s)}$. Both, the systematic uncertainty and the instability
are to our best knowledge currently the best achieved with any type of
transportable clock. For autonomous operation the TOC is installed in an
air-conditioned car-trailer. It is suitable for chronometric leveling with
sub-meter resolution as well as intercontinental cross-linking of optical
clocks, which is essential for a redefiniton of the SI second. In addition, the
TOC will be used for high precision experiments for fundamental science that
are commonly tied to precise frequency measurements and it is a first step to
space borne optical clocks

categories: physics.optics physics.atom-ph physics.ins-det quant-ph


title: On the Riesz means of $\delta_k(n)$

abstract:
  Let $k\geq 1$ be an integer. Let $\delta_k(n)$ denote the maximum divisor of
$n$ which is co-prime to $k$. We study the error term of the general $m$-th
Riesz mean of the arithmetical function $\delta_k(n)$ for any positive integer
$m \ge 1$, namely the error term $E_m(x)$ where
  \[ \frac{1}{m!}\sum_{n \leq x}\delta_k(n) \left( 1-\frac{n}{x} \right)^m =
M_{m, k}(x) + E_{m, k}(x). \] We establish a non-trivial upper bound for $\left
| E_{m, k} (x) \right |$, for any integer $m\geq 1$.


title:
Warm inflation with an oscillatory inflaton in the non-minimal kinetic
  coupling model

abstract:
  In the cold inflation scenario, the slow roll inflation and reheating via
coherent rapid oscillation, are usually considered as two distinct eras. When
the slow roll ends, a rapid oscillation phase begins and the inflaton decays to
relativistic particles reheating the Universe. In another model dubbed warm
inflation, the rapid oscillation phase is suppressed, and we are left with only
a slow roll period during which the reheating occurs. Instead, in this paper,
we propose a new picture for inflation in which the slow roll era is suppressed
and only the rapid oscillation phase exists. Radiation generation during this
era is taken into account, so we have warm inflation with an oscillatory
inflaton. To provide enough e-folds, we employ the non-minimal derivative
coupling model. We study the cosmological perturbations and compute the
temperature at the end of warm oscillatory inflation.


title:
Fully gapped superconducting state in Au2Pb: a natural candidate for
  topological superconductor

abstract:
  We measured the ultra-low-temperature specific heat and thermal conductivity
of Au$_2$Pb single crystal, a possible three-dimensional Dirac semimetal with a
superconducting transition temperature $T_c \approx$ 1.05 K. The electronic
specific heat can be fitted by a two-band s-wave model, which gives the gap
amplitudes $\Delta_1$(0)/$k_BT_c$ = 1.38 and $\Delta_2$(0)/$k_BT_c$ = 5.25.
From the thermal conductivity measurements, a negligible residual linear term
$\kappa_0/T$ in zero field and a slow field dependence of $\kappa_0/T$ at low
field are obtained. These results suggest that Au$_2$Pb has a fully gapped
superconducting state in the bulk, which is a necessary condition for
topological superconductor if Au$_2$Pb is indeed one.


title:
Determination of Bond Wire Failure Probabilities in Microelectronic
  Packages

abstract:
  This work deals with the computation of industry-relevant bond wire failure
probabilities in microelectronic packages. Under operating conditions, a
package is subject to Joule heating that can lead to electrothermally induced
failures. Manufacturing tolerances result, e.g., in uncertain bond wire
geometries that often induce very small failure probabilities requiring a high
number of Monte Carlo (MC) samples to be computed. Therefore, a hybrid MC
sampling scheme that combines the use of an expensive computer model with a
cheap surrogate is used. The fraction of surrogate evaluations is maximized
using an iterative procedure, yielding accurate results at reduced cost.
Moreover, the scheme is non-intrusive, i.e., existing code can be reused. The
algorithm is used to compute the failure probability for an example package and
the computational savings are assessed by performing a surrogate efficiency
study.


title:
Transfer Learning for Material Classification using Convolutional
  Networks

abstract:
  Material classification in natural settings is a challenge due to complex
interplay of geometry, reflectance properties, and illumination. Previous work
on material classification relies strongly on hand-engineered features of
visual samples. In this work we use a Convolutional Neural Network (convnet)
that learns descriptive features for the specific task of material recognition.
Specifically, transfer learning from the task of object recognition is
exploited to more effectively train good features for material classification.
The approach of transfer learning using convnets yields significantly higher
recognition rates when compared to previous state-of-the-art approaches. We
then analyze the relative contribution of reflectance and shading information
by a decomposition of the image into its intrinsic components. The use of
convnets for material classification was hindered by the strong demand for
sufficient and diverse training data, even with transfer learning approaches.
Therefore, we present a new data set containing approximately 10k images
divided into 10 material categories.


title:
Quark and Gluon Production from a Boost-invariantly Expanding Color
  Electric Field

abstract:
  Particle production from an expanding classical color electromagnetic field
is extensively studied, motivated by the early stage dynamics of
ultra-relativistic heavy ion collisions. We develop a formalism at one-loop
order to compute the particle spectra by canonically quantizing quark, gluon
and ghost fluctuations under the presence of such an expanding classical color
background field; the canonical quantization is done in the $\tau$-$\eta$
coordinates in order to take into account manifestly the expanding geometry. As
a demonstration, we model the expanding classical color background field by a
boost-invariantly expanding homogeneous color electric field with lifetime $T$,
for which we obtain analytically the quark and gluon production spectra by
solving the equations of motion of QCD non-perturbatively with respect to the
color electric field. In this paper we study (i) finite lifetime effect which
is found to modify significantly the particle spectra from those expected from
the Schwinger formula; (ii) the difference between the quark and gluon
production; and (iii) the quark mass dependence of the production spectra.
Implications of these results to ultra-relativistic heavy ion collisions are
also discussed.


title:
Multi-fluid approach to high-frequency waves in plasmas: I.
  Small-amplitude regime in fully ionized medium

abstract:
  Ideal MHD provides an accurate description of low-frequency Alfv\'en waves in
fully ionized plasmas. However, higher frequency waves in many plasmas of the
solar atmosphere cannot be correctly described by ideal MHD and a more accurate
model is required. Here, we study the properties of small-amplitude
incompressible perturbations in both the low and the high frequency ranges in
plasmas composed of several ionized species. We use a multi-fluid approach and
take into account the effects of collisions between ions and the inclusion of
Hall's term in the induction equation. Through the analysis of the
corresponding dispersion relations and numerical simulations we check that at
high frequencies ions of different species are not as strongly coupled as in
the low frequency limit. Hence, they cannot be treated as a single fluid. In
addition, elastic collisions between the distinct ionized species are not
negligible for high frequency waves since an appreciable damping is obtained.
Furthermore, Coulomb collisions between ions remove the cyclotron resonances
and the strict cut-off regions that are present when collisions are not taken
into account. The implications of these results for the modelling of
high-frequency waves in solar plasmas are discussed.


title: Where does curvaton reside? Differences between bulk and brane frames

abstract:
  Some classes of inflationary models naturally introduce two distinct
metrics/frames, and their equivalence in terms of observables has often been
put in question. D-brane inflation proposes candidates for an inflaton embedded
in the string theory and possesses descriptions on the brane and bulk
metrics/frames, which are connected by a conformal/disformal transformation
that depends on the inflaton and its derivatives. It has been shown that
curvature perturbations generated by the inflaton are identical in both frames,
meaning that observables such as the spectrum of cosmic microwave background
(CMB) anisotropies are independent of whether matter fields---including those
in the standard model of particle physics---minimally couple to the brane or
the bulk metric/frame. This is true despite the fact that the observables are
eventually measured by the matter fields and that the total action including
the matter fields is different in the two cases. In contrast, in curvaton
scenarios, the observables depend on the frame to which the curvaton minimally
couples. Among all inflationary scenarios, we focus on two models motivated by
the KKLMMT fine-tuning problem: a slow-roll inflation with an inflection-point
potential and a model of a rapidly rolling inflaton that conformally couples to
gravity. In the first model, the difference between the frames in which the
curvaton resides is encoded in the spectral index of the curvature
perturbations, depicting the nature of the frame transformation. In the second
model, the curvaton on the brane induces a spectral index significantly
different from that in the bulk and is even falsified by the observations. This
work thus demonstrates that two frames connected by a conformal/disformal
transformation lead to different physical observables such as CMB anisotropies
in curvaton models.


title: Hands-Free Segmentation of Medical Volumes via Binary Inputs

abstract:
  We propose a novel hands-free method to interactively segment 3D medical
volumes. In our scenario, a human user progressively segments an organ by
answering a series of questions of the form "Is this voxel inside the object to
segment?". At each iteration, the chosen question is defined as the one halving
a set of candidate segmentations given the answered questions. For a quick and
efficient exploration, these segmentations are sampled according to the
Metropolis-Hastings algorithm. Our sampling technique relies on a combination
of relaxed shape prior, learnt probability map and consistency with previous
answers. We demonstrate the potential of our strategy on a prostate
segmentation MRI dataset. Through the study of failure cases with synthetic
examples, we demonstrate the adaptation potential of our method. We also show
that our method outperforms two intuitive baselines: one based on random
questions, the other one being the thresholded probability map.


title:
Stability Analysis of Wholesale Electricity Markets under Dynamic
  Consumption Models and Real-Time Pricing

abstract:
  This paper analyzes stability conditions for wholesale electricity markets
under real-time retail pricing and realistic consumption models with memory,
which explicitly take into account previous electricity prices and consumption
levels. By passing on the current retail price of electricity from supplier to
consumer and feeding the observed consumption back to the supplier, a
closed-loop dynamical system for electricity prices and consumption arises
whose stability is to be investigated. Under mild assumptions on the generation
cost of electricity and consumers' backlog disutility functions, we show that,
for consumer models with price memory only, market stability is achieved if the
ratio between the consumers' marginal backlog disutility and the suppliers'
marginal cost of supply remains below a fixed threshold. Further, consumer
models with price and consumption memory can result in greater stability
regions and faster convergence to the equilibrium compared to models with price
memory alone, if consumption deviations from nominal demand are adequately
penalized.


title:
$L^p$ boundedness of the Bergman projection on the generalized Hartogs
  triangles

abstract:
  In this paper we investigate a two classes of domains in $\mathbb{C}^n$
generalizing the Hartogs triangle. We prove optimal estimates for the mapping
properties of the Bergman projection on these domains.


title:
Spectroscopy of candidate electromagnetic counterparts to gravitational
  wave sources

abstract:
  A programme of worldwide, multi-wavelength electromagnetic follow-up of
sources detected by gravitational wave detectors is in place. Following the
discovery of GW150914 and GW151226, wide field imaging of their sky
localisations identified a number of candidate optical counterparts which were
then spectrally classified. The majority of candidates were found to be
supernovae at redshift ranges similar to the GW events and were thereby ruled
out as a genuine counterpart. Other candidates ruled out include AGN and solar
system objects. Given the GW sources were black hole binary mergers, the lack
of an identified electromagnetic counterpart is not surprising. However the
observations show that is it is possible to organise and execute a campaign
that can eliminate the majority of potential counterparts. Finally we note the
existence of a "classification gap" with a significant fraction of candidates
going unclassified.


title:
Theoretical Study of the Frustrated Ising Antiferromagnet on the
  Honeycomb Lattice

abstract:
  We study effects of the next-next-nearest-neighbour antiferromagnetic ($J_3 <
0$) interaction on critical properties (or phase diagram) of the frustrated
spin-$\frac{1}{2}$ $J_1-J_2-J_3$ Ising antiferromagnet on the honeycomb lattice
by using the effective-field theory with correlations. Beside the ground-state
energy, we find that there is a region of $J_3 < 0$ in which the frustrated
honeycomb lattice antiferromagnet exhibits a tricritical point, at which the
phase transition changes from the second order to the first one on the line
between N\'eel antiferromagnetic and paramagnetic phases.


title:
Experimental Realization of an Achromatic Magnetic Mirror based on
  Metamaterials

abstract:
  Our work relates to the use of metamaterials engineered to realize a
meta-surface approaching the exotic properties of an ideal object not observed
in nature, a "magnetic mirror". Previous realizations were based on resonant
structures which implied narrow bandwidths and large losses. The working
principle of our device is ideally frequency-independent, it does not involve
resonances and it does not rely on a specific technology. The performance of
our prototype, working at millimetre wavelengths, has never been achieved
before and it is superior to any other device reported in the literature, both
in the microwave and optical regions. The device inherently has large bandwidth
(144%), low losses (<1 %) and is almost independent of incidence-angle and
polarization-state and thus approaches the behaviour of an ideal magnetic
mirror. Applications of magnetic mirrors range from low-profile antennas,
absorbers to optoelectronic devices. Our device can be realised using different
technologies to operate in other spectral regions.


title:
Cheshire Cat resurgence, Self-resurgence and Quasi-Exact Solvable
  Systems

abstract:
  We explore a one parameter $\zeta$-deformation of the quantum-mechanical
Sine-Gordon and Double-Well potentials which we call the Double Sine-Gordon
(DSG) and the Tilted Double Well (TDW), respectively. In these systems, for
positive integer values of $\zeta$, the lowest $\zeta$ states turn out to be
exactly solvable for DSG - a feature known as Quasi-Exact-Solvability (QES) -
and solvable to all orders in perturbation theory for TDW. For DSG such states
do not show any instanton-like dependence on the coupling constant, although
the action has real saddles. On the other hand, although it has no real
saddles, the TDW admits all-orders perturbative states that are not
normalizable, and hence, requires a non-perturbative energy shift. Both of
these puzzles are solved by including complex saddles. We show that the
convergence is dictated by the quantization of the hidden topological angle.
Further, we argue that the QES systems can be linked to the exact cancellation
of real and complex non-perturbative saddles to all orders in the
semi-classical expansion. We also show that the entire resurgence structure
remains encoded in the analytic properties of the $\zeta$-deformation, even
though exactly at integer values of $\zeta$ the mechanism of resurgence is
obscured by the lack of ambiguity in both the Borel sum of the perturbation
theory as well as the non-perturbative contributions. In this way, all of the
characteristics of resurgence remains even when its role seems to vanish, much
like the lingering grin of the Cheshire Cat. We also show that the perturbative
series is Self-resurgent -a feature by which there is a one-to-one relation
between the early terms of the perturbative expansion and the late terms of the
same expansion -which is intimately connected with the Dunne-\"{U}nsal
relation. We explicitly verify that this is indeed the case.


title: Affine Hecke algebras and quantum symmetric pairs

abstract:
  We introduce an affine Schur algebra via the affine Hecke algebra associated
to Weyl group of affine type C. We establish multiplication formulas on the
affine Hecke algebra and affine Schur algebra. Then we construct monomial bases
and canonical bases for the affine Schur algebra. The multiplication formula
allows us to establish a stabilization property of the family of affine Schur
algebras that leads to the modified version of an algebra ${\mathbf
K}^{\mathfrak c}_n$. We show that ${\mathbf K}^{\mathfrak c}_n$ is a coideal
subalgebra of quantum affine algebra ${\bf U}(\hat{\mathfrak{gl}}_n)$, and
$\big({\mathbf U}(\hat{ \mathfrak{gl}}_n), {\mathbf K}^{\mathfrak c}_n)$ forms
a quantum symmetric pair. The modified coideal subalgebra is shown to admit
monomial and stably canonical bases. We also formulate several variants of the
affine Schur algebra and the (modified) coideal subalgebra above, as well as
their monomial and canonical bases. This work provides a new and algebraic
approach which complements and sheds new light on our previous geometric
approach on the subject. In the appendix by four of the authors, new length
formulas for the Weyl groups of affine classical types are obtained in a
symmetrized fashion.


title: Reversible heating in electric double layer capacitors

abstract:
  A detailed comparison is made between different viewpoints on reversible
heating in electric double layer capacitors. We show in the limit of slow
charging that a combined Poisson-Nernst-Planck and heat equation, first studied
by d'Entremont and Pilon [J. Power Sources {\bf 246}, 887 (2014)], recovers the
temperature changes as predicted by the thermodynamic identity of Janssen,
H\"{a}rtel, and van Roij [Phys. Rev. Lett. {\bf 113}, 268501 (2014)], and
disagrees with the approximative model of Schiffer, Linzen, and Sauer [J. Power
Sources {\bf 160}, 765 (2006)] that predominates the literature.


title: GMRES convergence bounds for eigenvalue problems

abstract:
  The convergence of GMRES for solving linear systems can be influenced heavily
by the structure of the right hand side. Within the solution of eigenvalue
problems via inverse iteration or subspace iteration, the right hand side is
generally related to an approximate invariant subspace of the linear system. We
give detailed and new bounds on (block) GMRES that take the special behavior of
the right hand side into account and explain the initial sharp decrease of the
GMRES residual. The bounds give rise to adapted preconditioners applied to the
eigenvalue problems, e.g. tuned and polynomial preconditioners. The numerical
results show that the new (block) GMRES bounds are much sharper than
conventional bounds and that preconditioned subspace iteration with either a
tuned or polynomial preconditioner should be used in practice.


title: Background rejection in NEXT using deep neural networks

abstract:
  We investigate the potential of using deep learning techniques to reject
background events in searches for neutrinoless double beta decay with high
pressure xenon time projection chambers capable of detailed track
reconstruction. The differences in the topological signatures of background and
signal events can be learned by deep neural networks via training over many
thousands of events. These networks can then be used to classify further events
as signal or background, providing an additional background rejection factor at
an acceptable loss of efficiency. The networks trained in this study performed
better than previous methods developed based on the use of the same topological
signatures by a factor of 1.2 to 1.6, and there is potential for further
improvement.


title: Flat Holography: Aspects of the dual field theory

abstract:
  Assuming the existence of a field theory in D dimensions dual to
(D+1)-dimensional flat space, governed by the asymptotic symmetries of flat
space, we make some preliminary remarks about the properties of this field
theory. We review briefly some successes of the 3d bulk - 2d boundary case and
then focus on the 4d bulk - 3d boundary example, where the symmetry in question
is the infinite dimensional BMS4 algebra. We look at the constraints imposed by
this symmetry on a 3d field theory by constructing highest weight
representations of this algebra. We construct two and three point functions of
BMS primary fields and surprisingly find that symmetries constrain these
correlators to be identical to those of a 2d relativistic conformal field
theory. We then go one dimension higher and construct prototypical examples of
4d field theories which are putative duals of 5d Minkowski spacetimes. These
field theories are ultra-relativistic limits of electrodynamics and Yang-Mills
theories which exhibit invariance under the conformal Carroll group in D=4. We
explore the different sectors within these Carrollian gauge theories and
investigate the symmetries of the equations of motion to find that an infinite
ultra-relativistic conformal structure arises in each case.


title: Italy goes to Stanford: a collection of CoreNLP modules for Italian

abstract:
  In this we paper present Tint, an easy-to-use set of fast, accurate and
extendable Natural Language Processing modules for Italian. It is based on
Stanford CoreNLP and is freely available as a standalone software or a library
that can be integrated in an existing project.


title: Identifying a new particle with jet substructures

abstract:
  We investigate a potential of measuring properties of a heavy resonance X,
exploiting jet substructure techniques. Motivated by heavy higgs boson
searches, we focus on the decays of X into a pair of (massive) electroweak
gauge bosons. More specifically, we consider a hadronic Z boson, which makes it
possible to determine properties of X at an earlier stage. For $m_X$ of O(1)
TeV, two quarks from a Z boson would be captured as a "merged jet" in a
significant fraction of events. The use of the merged jet enables us to
consider a Z-induced jet as a reconstructed object without any combinatorial
ambiguity. We apply a conventional jet substructure method to extract
four-momenta of subjets from a merged jet. We find that jet substructure
procedures may enhance features in some kinematic observables formed with
subjets. Subjet momenta are fed into the matrix element associated with a given
hypothesis on the nature of X, which is further processed to construct a matrix
element method (MEM)-based observable. For both moderately and highly boosted Z
bosons, we demonstrate that the MEM with current jet substructure techniques
can be a very powerful discriminator in identifying the physics nature of X. We
also discuss effects from choosing different jet sizes for merged jets and
jet-grooming parameters upon the MEM analyses.


title:
Coupling WW, ZZ unitarized amplitudes to $\gamma\gamma$ in the TeV
  region

abstract:
  We define and calculate helicity partial-wave amplitudes for processes
linking the Electroweak Symmetry Breaking Sector (EWSBS) to $\gamma\gamma$,
employing (to NLO) the Higgs-EFT (HEFT) extension of the Standard Model and the
Equivalence Theorem, while neglecting all particle masses. The resulting
amplitudes can be useful in the energy regime ($500\,{\rm GeV}-3\,{\rm TeV}$).
We also deal with their unitarization so that resonances of the EWSBS can
simultaneously be described in the $\gamma\gamma$ initial or final states. Our
resulting amplitudes satisfy unitarity, perturbatively in $\alpha$, but for all
$s$ values. In this way we improve on the HEFT that fails as interactions
become stronger with growing $s$ and provide a natural framework for the decay
of dynamically generated resonances into $WW$, $ZZ$ and $\gamma\gamma$ pairs.


title:
Observation of Inverse Edelstein Effect in Rashba-Split 2DEG between
  SrTiO3 and LaAlO3 at Room Temperature

abstract:
  The Rashba physics has been intensively studied in the field of spin
orbitronics, for the purpose of searching novel physical properties and the FM
magnetization switching for technology applications. Here, we report the
observation of the inverse Edelstein effect up to room temperature in the
Rashba-split 2DEG between two insulating oxides SrTiO3 and LaAlO3 with the
LaAlO3 layer thickness from 3 to 40 unit cells (UC). We further demonstrate
that the spin voltage could be dramatically manipulated by electric field
effect for the 2DEG between SrTiO3 and 3 UC LaAlO3. These results demonstrate
that the Rashba-split 2DEG at the complex oxide interface can be used for room
temperature efficient charge-and-spin conversion for the generation and
detection of spin current.


title:
Explanation of the Special Theory of Relativity by Analytical Geometry
  and Reformulation of the Inverse-Square-Law

abstract:
  The space-time length R between a moving source and the observation point is
calculated in order to substitute with it the spatial distance D, normally used
in the Newton's law of gravitation, as well as in any inverse-square-law.
Fundamentally, three space-time amounts describe dynamics. The relationship
between position and field intensity is analytic, estimable in euclidean space,
and considering a linear reference system for the time parameter. The
formulation shows compatibility with fundamental rules of classical mechanics,
highlighting also hitherto unknown properties, as a perfect analogy between
morphological and physical parameters, such as the complete correspondence
between the eccentricity and the momentum in the orbital motion. Moreover, the
procedure naturally contains relativistic formulation without introducing any
special hypothesis on light speed isotropy, asking so the question about the
actual need to introduce the concept of space-time curvature for the correct
interpretation of physics phenomena.


title: Spectrum and separability of mixed 2-qubit X-states

abstract:
  The separable mixed 2-qubit X-states are classified in accordance with
degeneracies in the spectrum of density matrices. It is shown that there are
four classes of separable X-states, among them: one 4D family, a pair of 2D
family and a single, zero-dimensional maximally mixed state.


title:
Interference Reduction in Music Recordings Combining Kernel Additive
  Modelling and Non-Negative Matrix Factorization

abstract:
  In live and studio recordings unexpected sound events often lead to
interferences in the signal. For non-stationary interferences, sound source
separation techniques can be used to reduce the interference level in the
recording. In this context, we present a novel approach combining the strengths
of two algorithmic families: NMF and KAM. The recent KAM approach applies
robust statistics on frames selected by a source-specific kernel to perform
source separation. Based on semi-supervised NMF, we extend this approach in two
ways. First, we locate the interference in the recording based on detected NMF
activity. Second, we improve the kernel-based frame selection by incorporating
an NMF-based estimate of the clean music signal. Further, we introduce a
temporal context in the kernel, taking some musical structure into account. Our
experiments show improved separation quality for our proposed method over a
state-of-the-art approach for interference reduction.


title: Multiplexed sub-Doppler spectroscopy with an optical frequency comb

abstract:
  An optical frequency comb generated with an electro-optic phase modulator and
a chirped radiofrequency waveform is used to perform saturation and pump-probe
spectroscopy on the $D_1$ and $D_2$ transitions of atomic potassium. With a
comb tooth spacing of 200 kHz and an optical bandwidth of 2 GHz the hyperfine
transitions can be simultaneously observed. Interferograms are recorded in as
little as 5 $\mu$s (a timescale corresponding to the inverse of the comb tooth
spacing). Importantly, the sub-Doppler features can be measured as long as the
laser carrier frequency lies within the Doppler profile, thus removing the need
for slow scanning or a priori knowledge of the frequencies of the sub-Doppler
features. Sub-Doppler optical frequency comb spectroscopy has the potential to
dramatically reduce acquisition times and allow for rapid and accurate
assignment of complex molecular and atomic spectra which are presently
intractable.


title:
Properties of solutions to the Camassa-Holm equation on the line in a
  class containing the peakons

abstract:
  We study special properties of solutions to the IVP associated to the
Camassa-Holm equation on the line related to the regularity and the decay of
solutions. The first aim is to show how the regularity on the initial data is
transferred to the corresponding solution in a class containing the "peakon
solutions". In particular, we shall show that the local regularity is similar
to that exhibited by the solution of the inviscid Burger's equation with the
same initial datum. The second goal is to prove that the decay results obtained
in a paper of Himonas, Misio{\l}ek, Ponce, and Zhou extend to the class of
solutions considered here.


title:
Measurements of long-range azimuthal anisotropies and associated Fourier
  coefficients for $pp$ collisions at $\sqrt{s}=5.02$ and $13$ TeV and $p$+Pb
  collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector

abstract:
  ATLAS measurements of two-particle correlations are presented for $\sqrt{s} =
5.02$ and $13$ TeV $pp$ collisions and for $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV
$p$+Pb collisions at the LHC. The correlation functions are measured as a
function of relative azimuthal angle $\Delta \phi$, and pseudorapidity
separation $\Delta \eta$, using charged particles detected within the
pseudorapidity interval $|\eta|{<}2.5$. Azimuthal modulation in the long-range
component of the correlation function, with $|\Delta\eta|{>}2$, is studied
using a template fitting procedure to remove a "back-to-back" contribution to
the correlation function that primarily arises from hard-scattering processes.
In addition to the elliptic, $\cos{(2\Delta\phi)}$, modulation observed in a
previous measurement, the $pp$ correlation functions exhibit significant
$\cos{(3\Delta\phi)}$ and $\cos{(4\Delta\phi)}$ modulation. The Fourier
coefficients $v_{n,n}$ associated with the $\cos{(n\Delta\phi)}$ modulation of
the correlation functions for $n =$ $2$-$4$ are measured as a function of
charged-particle multiplicity and charged-particle transverse momentum. The
Fourier coefficients are observed to be compatible with $\cos{(n\phi)}$
modulation of per-event single-particle azimuthal angle distributions. The
single-particle Fourier coefficients $v_n$ are measured as a function of
charged-particle multiplicity, and charged-particle transverse momentum for $n
{=} $ $2$-$4$. The integrated luminosities used in this analysis are, $64$
$\mathrm{nb^{-1}}$ for the $\sqrt{s}=13$ TeV $pp$ data, $170$
$\mathrm{nb^{-1}}$ for the $\sqrt{s}=5.02$ TeV $pp$ data and $28$
$\mathrm{nb^{-1}}$ for the $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV $p$+Pb data.


title:
Anisotropic Shubin operators and eigenfunctions expansions in
  Gelfand-Shilov spaces

abstract:
  We derive new results on the characterization of Gelfand--Shilov spaces
$\mathcal{S}^\mu_\nu (\R^n)$, $\mu,\nu >0$, $\mu+\nu \geq 1$ by Gevrey
estimates of the $L^2$ norms of iterates of $(m,k)$ anisotropic globally
elliptic Shubin (or $\Gamma$) type operators, $(-\Delta)^{m/2} +| x |^k$ with
$m,k\in 2\N$ being a model operator, and on the decay of the Fourier
coefficients in the related eigenfunction expansions. Similar results are
obtained for the spaces $\Sigma^\mu_\nu (\R^n)$, $\mu,\nu >0$, $\mu+\nu > 1$,
cf. \eqref{GSdef}. In contrast to the symmetric case $\mu = \nu$ and $k=m$
(classical Shubin operators) we encounter resonance type phenomena involving
the ratio $\kappa:=\mu/\nu$; namely we obtain a characterization of
$\mathcal{S}^\mu_\nu(\R^n)$ and $\Sigma^\mu_\nu(\R^n)$ in the case
$\mu=kt/(k+m), \nu= mt/(k+m), t \geq 1$, that is, when $\kappa=k/m \in \Q$.


title: On the local discrimination of quantum measurements

abstract:
  The discrimination of quantum measurements is an important subject of quantum
information processes. In this paper we present a novel protocol for local
quantum measurement discrimination with multi-qubit entanglement systems. It is
shown that, in the case of Bob did not know Alice's result of measurement, if
both two observers (Alice and Bob) agreed in advance that Alice should measure
her qubits before an appointed time t, the local discrimination of two
different kinds of measurement can be completed via numerous eight-qubit GHZ
entangled states and selective projective measurement.


title: Positive Exchange Bias between Permalloy and Twined (10-10)-Cr2O3 Films

abstract:
  We report the discovery of a positive exchange bias between Ni80Fe20 (Py) and
twined (10-10)-Cr2O3 film near its blocking temperature (TB) when it is cooled
in an in-plane magnetic field applied along 45 degrees from the two spin
configurations of the Cr atoms. This is an abnormal behavior compared to the
negative exchange bias at all temperatures below TB when the cooling and
measuring magnetic fields are applied along one of the two spin configurations
of the Cr atoms. We speculate these results could be related to the exchange
interactions between the twined structure of the (10-10)-Cr2O3 film epitaxially
grown on the rutile (001)-TiO2 substrate.


title: Nonlinear left and right eigenvectors for max-preserving maps

abstract:
  It is shown that max-preserving maps (or join-morphisms) on the positive
orthant in Euclidean $n$-space endowed with the component-wise partial order
give rise to a semiring. This semiring admits a closure operation for maps that
generate stable dynamical systems. For these monotone maps, the closure is used
to define suitable notions of left and right eigenvectors that are
characterized by inequalities. Some explicit examples are given and
applications in the construction of Lyapunov functions are described.


title:
Atomic "bomb testing": the Elitzur-Vaidman experiment violates the
  Leggett-Garg inequality

abstract:
  Elitzur and Vaidman have proposed a measurement scheme that, based on the
quantum superposition principle, allows one to detect the presence of an object
--- in a dramatic scenario, a bomb --- without interacting with it. It was
pointed out by Ghirardi that this interaction-free measurement scheme can be
put in direct relation with falsification tests of the macro-realistic
worldview. Here we have implemented the "bomb test" with a single atom trapped
in a spin-dependent optical lattice to show explicitly a violation of the
Leggett-Garg inequality --- a quantitative criterion fulfilled by
macro-realistic physical theories. To perform interaction-free measurements, we
have implemented a novel measurement method that correlates spin and position
of the atom. This method, which quantum mechanically entangles spin and
position, finds general application for spin measurements, thereby avoiding the
shortcomings inherent in the widely used push-out technique. Allowing
decoherence to dominate the evolution of our system causes a transition from
quantum to classical behavior in fulfillment of the Leggett-Garg inequality.


title: Endomorphisms of Exotic Models

abstract:
  We calculate the endomorphism dga of Franke's exotic algebraic model for the
$K$-local stable homotopy category at odd primes. We unravel its original
abstract structure to give explicit generators, differentials and products.


title: Tuning the multiferroic mechanisms of TbMnO3 by epitaxial strain

abstract:
  A current challenge in the field of magnetoelectric multiferroics is to
identify systems that allow a controlled tuning of states displaying distinct
magnetoelectric responses. Here we show that the multiferroic ground state of
the archetypal multiferroic TbMnO3 is dramatically modified by epitaxial
strain. Neutron diffraction reveals that in highly strained films the magnetic
order changes from the bulk-like incommensurate bc-cycloidal structure to
commensurate magnetic order. Concomitant with the modification of the magnetic
ground state, optical second-harmonic generation (SHG) and electric
measurements show an enormous increase of the ferroelectric polarization, and a
change in its direction from along the c- to the a-axis. Our results suggest
that the drastic change of multiferroic properties results from a switch of the
spin-current magnetoelectric coupling in bulk TbMnO3 to symmetric
magnetostriction in epitaxially-strained TbMnO3. These findings experimentally
demonstrate that epitaxial strain can be used to control single-phase
spin-driven multiferroic states.


title:
An Efficient Method of Partitioning High Volumes of Multidimensional
  Data for Parallel Clustering Algorithms

abstract:
  An optimal data partitioning in parallel & distributed implementation of
clustering algorithms is a necessary computation as it ensures independent task
completion, fair distribution, less number of affected points and better &
faster merging. Though partitioning using Kd Tree is being conventionally used
in academia, it suffers from performance drenches and bias (non equal
distribution) as dimensionality of data increases and hence is not suitable for
practical use in industry where dimensionality can be of order of 100s to
1000s. To address these issues we propose two new partitioning techniques using
existing mathematical models & study their feasibility, performance (bias and
partitioning speed) & possible variants in choosing initial seeds. First method
uses an n dimensional hashed grid based approach which is based on mapping the
points in space to a set of cubes which hashes the points. Second method uses a
tree of voronoi planes where each plane corresponds to a partition. We found
that grid based approach was computationally impractical, while using a tree of
voronoi planes (using scalable K-Means++ initial seeds) drastically
outperformed the Kd-tree tree method as dimensionality increased.


title:
Collisional broadening of angular correlations in a multiphase transport
  model

abstract:
  Systematic comparisons of jetlike correlation data to radiative and
collisional energy loss model calculations are essential to extract transport
properties of the quark-gluon medium created in relativistic heavy ion
collisions. This paper presents a transport study of collisional broadening of
jetlike correlations, by following parton-parton collision history in a
multiphase transport (AMPT) model. The correlation shape is studied as a
function of the number of parton-parton collisions suffered by a high
transverse momentum probe parton ($N_{\rm coll}$) and the azimuth of the probe
relative to the reaction plane ($\phi_{\rm fin.}^{\rm probe}$). Correlation is
found to broaden with increasing $N_{\rm coll}$ and $\phi_{\rm fin.}^{\rm
probe}$ from in- to out-of-plane direction. This study provides a transport
model reference for future jet-medium interaction studies.


title:
New special cases of the Quadratic Assignment Problem with diagonally
  structured coefficient matrices

abstract:
  We consider new polynomially solvable cases of the well-known Quadratic
Assignment Problem involving coefficient matrices with a special diagonal
structure. By combining the new special cases with polynomially solvable
special cases known in the literature we obtain a new and larger class of
polynomially solvable special cases of the QAP where one of the two coefficient
matrices involved is a Robinson matrix with an additional structural property:
this matrix can be represented as a conic combination of cut matrices in a
certain normal form. The other matrix is a conic combination of a monotone
anti-Monge matrix and a down-benevolent Toeplitz matrix. We consider the
recognition problem for the special class of Robinson matrices mentioned above
and show that it can be solved in polynomial time.


title: P-V criticality of AdS black holes in a general framework

abstract:
  In black hole thermodynamics, it has been observed that AdS black holes
behave as van der Waals system if one interprets the cosmological constant as a
pressure term. Also the critical exponents for the phase transition of AdS
black holes and the van der Waals systems are same. Till now this type of
analysis is done by two steps. In the first step one shows that a particular
metric allows phase transition and in the second step, using this information,
one calculates the exponents. Here, we present a different approach based on
two universal inputs (the general forms of the Smarr formula and the first law
of thermodynamics) and one assumption regarding the existence of van der Waal
like critical point for a metric. We find that the same values of the critical
exponents can be obtained by this approach. Thus we demonstrate that, though
the existence of van der Waal like phase transition depends on specific
metrics, the values of critical exponents are then fixed for that set of
metrics.


title:
Discovery of an extended source of gamma-ray emission in the Southern
  Hemisphere

abstract:
  We report the discovery of a $\sim$ $3.4\degr$-wide region of high-energy
emission in data from the \emph{Fermi} LAT satellite. The centroid of the
emission is located in the Southern Hemisphere sky, a few degrees away from the
plane of the Galaxy at the Galactic coordinates l=350.6$\degr$, b=-4.7$\degr$.
It shows a hard spectrum that is compatible with a simple power-law,
$\frac{dN}{dE}\propto E^{-\Gamma}$, in the energy range 0.7--500 GeV, with a
spectral index $\Gamma = 1.68 \pm 0.04_{\mbox{stat}} \pm 0.1_{\mbox{sys}}$. The
integrated source photon flux above 0.7 GeV is $(4.71 \pm 0.49_{\mbox{stat}}\pm
2.13_{\mbox{sys}}) \times 10^{-9}$ cm$^{-2}$ s$^{-1}$. We discuss several
hypotheses for the nature of the source, particularly that the emission comes
from the shell of an unknown supernova remnant.


title: Vortex scattering by impurities in a Bose-Einstein condensate

abstract:
  Understanding quantum dynamics in a two-dimensional Bose-Einstein condensate
(BEC) relies on understanding how vortices interact with each others
microscopically and with local imperfections of the potential which confines
the condensate. Within a system consisting of many vortices, the trajectory of
a vortex-antivortex pair is often scattered by a third vortex, an effect
previously characterised. However, the natural question remains as to how much
of this effect is due to the velocity induced by this third vortex and how much
is due to the density inhomogeneity which it introduces. In this work, we
describe the various qualitative scenarios which occur when a vortex-antivortex
pair interacts with a smooth density impurity whose profile is identical to
that of a vortex but lacks the circulation around it.


title:
Nontrivial interplay of strong disorder and interactions in quantum
  spin-Hall insulators doped with dilute magnetic impurities

abstract:
  We investigate nonperturbatively the effect of a magnetic dopant impurity on
the edge transport of a quantum spin Hall (QSH) insulator. We show that for a
strongly coupled magnetic dopant located near the edge of a system, a pair of
transmission anti-resonances appear. When the chemical potential is on
resonance, interaction effects broaden the anti-resonance width with decreasing
temperature, thus suppressing transport for both repulsive and moderately
attractive interactions. Consequences for the recently observed QSH insulating
phase of the $1$-T$^{\prime}$ of WTe$_2$ are briefly discussed.


title:
Revivals and Casimir energy for a free Maxwell field (spin-1 singleton)
  on R x S^d for odd d

abstract:
  Earlier work on quantum revivals is extended to Maxwell fields (aka spin-one
singletons). An evaluation of the Casimir energy on the generalised Einstein
universe is also done to illustrate the utility of the Barnes zeta--function
and generalised Bernoulli polynomials. Contact is made with some recent
calculations in AdS/CFT. In particular. higher order singletons are considered
with the Casimir energy being a polynomial in the order.


title: Comments on a Theorem by Olivier Fr\'econ

abstract:
  There is no sad group of Morley rank 2n + 1 with an abelian Borel subgroup of
rank n. In particular, Fr{\'e}con's Theorem follows: There is no bad group of
Morely rank 3.


title:
Dimensional reduction of the Standard Model coupled to a new singlet
  scalar field

abstract:
  We derive an effective dimensionally reduced theory for the Standard Model
augmented by a real singlet scalar. We treat the singlet as a superheavy field
and integrate it out, leaving an effective theory involving only the Higgs and
$\mathrm{SU}(2)_\mathrm{L} \times \mathrm{U}(1)_Y$ gauge fields, identical to
the one studied previously for the Standard Model. This opens up the
possibility of efficiently computing the order and strength of the electroweak
phase transition, numerically and nonperturbatively, in this extension of the
Standard Model. Understanding the phase diagram is crucial for models of
electroweak baryogenesis and for studying the production of gravitational waves
at thermal phase transitions.


title: Accommodation of the Dirac Phase in the Krauss-Nasri-Trodden Model

abstract:
  We investigate one of the radiative models, Kraus-Nasri-Trodden model, with
the maximal value of Dirac CP violating phase, $\delta$ is -\pi/2 (or
equivalently 3\pi/2), which is preferred in not only recent long baseline
experiments but also the global fit of neutrino oscillation data. We show that
our predicted region of the \mu-e conversion rate can be searched in the future
experiments without conflicting lepton-flavor violation and dark matter
constraints.


title: On two inequalities of \v{C}eby\v{s}ev

abstract:
  In this work, several sharp bounds for the \v{C}eby\v{s}ev functional
involving various type of functions are proved. In particular, for the
\v{C}eby\v{s}ev functional of two absolutely continuous functions whose first
derivatives are both convex, convex and belong to $L_p$-spaces, convex and
bounded variation, convex and Lipschitz mappings new sharp bounds are
presented. Other related results regarding two convex and concave functions are
given.


title: Tuning the Kondo effect in Yb(Fe$_{1-x}$Co$_{x}$)$_{2}$Zn$_{20}$

abstract:
  We study the evolution of the Kondo effect in heavy fermion compounds,
Yb(Fe$_{1-x}$Co$_{x}$)$_{2}$Zn$_{20}$ (0$\leqslant$ x $\leqslant$ 1), by means
of temperature-dependent electric resistivity and specific heat. The ground
state of YbFe$_2$Zn$_{20}$ can be well described by a Kondo model with
degeneracy $N$ = 8 and a $T_K\sim$30 K. In the presence of a very similar total
CEF splitting with YbFe$_2$Zn$_{20}$, the ground state of YbCo$_2$Zn$_{20}$ is
close to a Kondo state with degeneracy $N$ = 2 and a much lower $T_K\sim$ 2 K.
Upon Co substitution, the coherence temperature of YbFe$_2$Zn$_{20}$ is
suppressed, accompanied by an emerging Schottky-like feature in specific heat
associated with the thermal depopulation of CEF levels upon cooling. For
0.4$\lesssim$ x $\lesssim$ 0.9, the ground state remains roughly the same which
can be qualitatively understood by Kondo effect in the presence of CEF
splitting. There is no clear indication of Kondo coherence observable in
resistivity within this substitution range down to 500 mK. The coherence
re-appears at around x$\gtrsim$ 0.9 and the coherence temperature increases
with higher Co concentration levels.


title:
Greatest lower bounds on the transverse Ricci curvature of some toric
  Sasaki manifolds

abstract:
  We determine the greatest lower bounds on the transverse Ricci curvature of
compact toric Sasaki manifolds with positive basic first Chern class and with
the first Chern class of the contact bundle being trivial. This is based on
Wang-Zhu's and Futaki-Ono-Wang's works, and is an analogue of C. Li's work on
toric Fano manifolds.


title:
Boundary convergence and path divergence sets for bounded analytic
  functions in the disk

abstract:
  Let $f:\mathbb{D}\to\mathbb{C}$ be a bounded analytic function. A set
$K\subset\mathbb{D}$ which contains the point $1$ in its boundary is called a
convergence set for $f$ at $1$ if $f(z)$ converges to some value $\zeta$ as
$z\to1$ with $z\in K$. $K$ is called a path divergence set for $f$ at $1$ if
$f$ diverges along every path $\gamma$ which lies in $K$ and approaches $1$. In
this article, we show that for a path $\gamma$ through the unit disk from $-1$
to $1$, if $f$ fails to converge along $\gamma$, then either the region above
$\gamma$ or the region below $\gamma$ is a path divergence set for $f$. On the
other hand, if $\gamma_1$ and $\gamma_2$ are two such paths, and $f$ converges
along both $\gamma_1$ and $\gamma_2$, then the region between $\gamma_1$ and
$\gamma_2$ is a convergence set for $f$. This latter fact is immediate when
$\gamma_1$ and $\gamma_2$ do not intersect except at their end-points, but
becomes non-trivial when $\gamma_1$ and $\gamma_2$ are highly intersecting. We
conclude the paper with an examination of the convergence sets for the function
$e^{\frac{z+1}{z-1}}$ at $1$.


title:
A Local Mesh Modification Strategy for Interface Problems with
  Application to Shape and Topology Optimization

abstract:
  We present and analyze a new finite element method for solving interface
problems on a triangular grid. The method locally modifies a given
triangulation such that the interfaces are accurately resolved and the maximal
angle condition holds. Therefore, optimal order of convergence can be shown.
Moreover, an appropriate scaling of the basis functions yields an optimal
condition number of the stiffness matrix. The method is applied to an optimal
design problem for an electric motor where the interface between different
materials is evolving in the course of the optimization procedure.


title:
Thermodynamic properties of neutral particle in presence of Topological
  defects in Magnetic Cosmic String Background

abstract:
  In this paper, we study the covariant form of the non-relativistic
Schrodinger-Pauli equation in the space-time generated by a cosmic string and
discuss the solutions of this equation in present of interaction between the
magnetic dipole momentum and electromagnetic field. We study the influence of
the topology on this system. We obtain the solution of radial part as well as
the energy levels. We consider all thermodynamic properties of neutral particle
in magnetic cosmic string background by using an approach based on the
partition function method.


title:
Compressible Fluids with Maxwell-type equations, the minimal coupling
  with electromagnetic field and the Stefan-Boltzmann law

abstract:
  In this work we have obtained a higher-derivative Lagrangian for a charged
fluid coupled with the electromagnetic fluid and the Dirac's constraints
analysis was discussed. A set of first-class constraints fixed by noncovariant
gauge condition was obtained. The path integral formalism was used to obtain
the partition function for the corresponding higher-derivative Hamiltonian and
the Faddeev-Popov ansatz was used to construct an effective Lagrangian. Through
the partition function, a Stefan-Boltzmann type law was obtained.


title: Generating Politically-Relevant Event Data

abstract:
  Automatically generated political event data is an important part of the
social science data ecosystem. The approaches for generating this data, though,
have remained largely the same for two decades. During this time, the field of
computational linguistics has progressed tremendously. This paper presents an
overview of political event data, including methods and ontologies, and a set
of experiments to determine the applicability of deep neural networks to the
extraction of political events from news text.


title:
Design of P-Type Cladding Layers for Tunnel-Injected UVA Light Emitting
  Diodes

abstract:
  We discuss the engineering of p-AlGaN cladding layers for achieving efficient
tunnel-injected III-Nitride ultraviolet light emitting diodes (UV LEDs) in the
UV-A spectral range. We show that capacitance-voltage measurements can be used
to estimate the compensation and doping in p-AlGaN layers located between the
multi-quantum well region and the tunnel junction layer. By increasing the
p-type doping concentration to overcome the background compensation, on-wafer
external quantum efficiency and wall-plug efficiency of 3.37% and 1.62% were
achieved for tunnel-injected UV LEDs emitting at 325 nm. We also show that
interband tunneling hole injection can be used to realize UV LEDs without any
acceptor doping. The work discussed here provides new understanding of hole
doping and transport in AlGaN-based UV LEDs, and demonstrates the excellent
performance of tunnel-injected LEDs for the UV-A wavelength range.

categories: cond-mat.mes-hall cond-mat.mtrl-sci physics.ins-det physics.optics


title: Generalized Exact Holographic Mapping with Wavelets

abstract:
  The idea of renormalization and scale invariance is pervasive across
disciplines. It has not only drawn numerous surprising connections between
physical systems under the guise of holographic duality, but has also inspired
the development of wavelet theory now widely used in signal processing.
Synergizing on these two developments, we describe in this paper a generalized
exact holographic mapping that maps a generic N-dimensional lattice system to a
N+1-dimensional holographic dual, with the emergent dimension representing
scale. In previous works, this was achieved via the iterations of the simplest
of all unitary mappings, the Haar mapping, which fails to preserve the form of
most Hamiltonians. By taking advantage of the full generality of biorthogonal
wavelets, our new generalized holographic mapping framework is able to preserve
the form of a large class of lattice Hamiltonians. By explicitly separating
features that are fundamentally associated with the physical system from those
that are basis-specific, we also obtain a clearer understanding of how the
resultant bulk geometry arises. For instance, the number of nonvanishing
moments of the high pass wavelet filter is revealed to be proportional to the
radius of the dual Anti deSitter (AdS) space geometry. We conclude by proposing
modifications to the mapping for systems with generic Fermi pockets.


title:
NIBLES - an HI census of stellar mass selected SDSS galaxies: II.
  Arecibo follow-up HI observations

abstract:
  We obtained Arecibo HI line follow-up observations of 154 of the 2600
galaxies in the Nan\c{c}ay Interstellar Baryons Legacy Extragalactic Survey
(NIBLES) sample. These observations are on average four times more sensitive
than the original observations at the Nan\c{c}ay Radio Telescope. The main goal
of this survey is to characterize the underlying HI properties of the NIBLES
galaxies which were undetected or marginally detected at Nan\c{c}ay. Of the
Nan\c{c}ay non-detections, 85% were either clearly or marginally detected at
Arecibo, while 89% of the Nan\c{c}ay marginal detections were clearly detected.
Based on the statistics of the detections relative to g-i color and r-band
luminosity (L$_r$) distribution among our Arecibo observations, we anticipate
~60% of our 867 Nan\c{c}ay non-detections and marginal detections could be
detected at the sensitivity of our Arecibo observations. Follow-up observations
of our low luminosity (L$_r$ < 10$^{8.5}$ L$_{\odot}$) blue sources indicate
that they have, on average, more concentrated stellar mass distributions than
the Nan\c{c}ay detections in the same luminosity range, suggesting we may be
probing galaxies with intrinsically different properties. These follow-up
observations enable us to probe HI mass fractions, log($M_{\rm
HI}$/$M_{\star}$) 0.5 dex and 1 dex lower, on average, than the NIBLES and
ALFALFA surveys respectively.


title: Localization of equivariant cohomology rings of real Grassmannians

abstract:
  We use localization method to understand the rational equivariant cohomology
rings of real Grassmannians and oriented Grassmannians, then relate this to the
Leray-Borel description which says the ring generators are equivariant
Pontryagin classes, Euler classes in even dimension, and one more new type of
classes in odd dimension, as stated by Casian and Kodama. We give additive
basis in terms of equivariant characteristic polynomials and equivariant
Schubert/canonical classes. We also calculate Poincar\'e series, equivariant
Littlewood-Richardson coefficients and equivariant characteristic numbers.
Since all these Grassmannians with torus actions are equivariantly formal, many
results for equivariant cohomology have similar statements for ordinary
cohomology.


title: Multi-Agent Interaction in Social Trading Network

abstract:
  The online retailers network models are considered. In some nodes of the
network consumers are located. Each consumer wishes to purchase a particular
product at minimal cost due to the price of goods and transport corruption
costs. Also, in some nodes of network online-retailers wish to allocate the
points of goods delivery. The points of goods delivery must be placed in
accordance with a certain principle of optimality. In this paper we propose an
algorithm for finding the optimal placement of goods delivery points in
accordance with the compromise solution as the principle of optimality.


title:
Identification and estimation of treatment and interference effects in
  observational studies on networks

abstract:
  Causal inference on a population of units connected through a network often
presents technical challenges, including how to account for interference. In
the presence of local interference, for instance, potential outcomes of a unit
depend on its treatment as well as on the treatments of other local units, such
as its neighbors according to the network. In observational studies, a further
complication is that the typical unconfoundedness assumption must be extended -
say, to include the treatment of neighbors, and indi- vidual and neighborhood
covariates - to guarantee identification and valid inference. Here, we propose
new estimands that define treatment and interference effects. We then derive
analytical expressions for the bias of a naive estimator that wrongly assumes
away interference. The bias depends on the level of interference but also on
the degree of association between individual and neighborhood treatments. We
propose an extended unconfoundedness assumption that accounts for interference,
and we develop new covariate-adjustment methods that lead to valid estimates of
treatment and interference effects in observational studies on networks.
Estimation is based on a generalized propensity score that balances individual
and neighborhood covariates across units under different levels of individual
treatment and of exposure to neighbors' treatment. We carry out simulations,
calibrated using friendship networks and covariates in a nationally
representative longitudinal study of adolescents in grades 7-12, in the United
States, to explore finite-sample performance in different realistic settings.


title:
Descriptive Proximities I: Properties and interplay between classical
  proximities and overlap

abstract:
  The theory of descriptive nearness is usually adopted when dealing with sets
that share some common properties even when the sets are not spatially close,
i.e., the sets have no members in common. Set description results from the use
of probe functions to define feature vectors that describe a set and the
nearness of sets is given by their proximities. A probe on a non-empty set $X$
is a real-valued function $\Phi: X \rightarrow \mathbb{R}^n$, where $\Phi(x)=
(\phi_1(x),.., \phi_n(x))$. We establish a connection between relations on an
object space $X$ and relations on the feature space $\Phi(X).$ Having as
starting point the Peters proximity, two sets are \emph{descriptively near}, if
and only if their descriptions intersect. In this paper, we construct a
theoretical approach to a more visual form of proximity, namely, descriptive
proximity, which has a broad spectrum of applications. We organize descriptive
proximities on two different levels: weaker or stronger than the Peters
proximity. We analyze the properties and interplay between descriptions on one
side and classical proximities and overlap relations on the other side.


title: On the Spectra of Real and Complex Lam\'e Operators

abstract:
  We study Lam\'e operators of the form $$L = -\frac{d^2}{dx^2} +
m(m+1)\omega^2\wp(\omega x+z_0),$$ with $m\in\mathbb{N}$ and $\omega$ a
half-period of $\wp(z)$. For rectangular period lattices, we can choose
$\omega$ and $z_0$ such that the potential is real, periodic and regular. It is
known after Ince that the spectrum of the corresponding Lam\'e operator has a
band structure with not more than $m$ gaps. In the first part of the paper, we
prove that the opened gaps are precisely the first $m$ ones. In the second
part, we study the Lam\'e spectrum for a generic period lattice when the
potential is complex-valued. We concentrate on the $m=1$ case, when the
spectrum consists of two regular analytic arcs, one of which extends to
infinity, and briefly discuss the $m=2$ case, paying particular attention to
the rhombic lattices.


title:
Performance and Scalability of Voltage Controllers in Multi-Terminal
  HVDC Networks

abstract:
  In this paper, we compare the transient performance of a multi-terminal
high-voltage DC (MTDC) grid equipped with a slack bus for voltage control to
that of two distributed control schemes: a standard droop controller and a
distributed averaging proportional-integral (DAPI) controller. We evaluate
performance in terms of an H2 metric that quantifies expected deviations from
nominal voltages, and show that the transient performance of a droop or DAPI
controlled MTDC grid is always superior to that of an MTDC grid with a slack
bus. In particular, by studying systems built up over lattice networks, we show
that the H2 norm of a slack bus controlled system may scale unboundedly with
network size, while the norm remains uniformly bounded with droop or DAPI
control. We simulate the control strategies on radial MTDC networks to
demonstrate that the transient performance for the slack bus controlled system
deteriorates significantly as the network grows, which is not the case with the
distributed control strategies.


title:
Bouncing Dirac particles: compatibility between MIT boundary conditions
  and Thomas precession

abstract:
  We consider the reflection of a Dirac plane wave on a perfectly reflecting
plane described by chiral MIT boundary conditions and determine the rotation of
the spin in the reflected component of the wave. We solve the analogous problem
for a classical particle using the evolution of the spin defined by the Thomas
precession and make a comparison with the quantum result. We find that the
rotation axes of the spin in the two problems coincide only for a vanishing
chiral angle, in which case the rotation angles coincide in the nonrelativistic
limit, and also remain remarkably close in the relativistic regime. The result
shows that in the nonrelativistic limit the interaction between the spin and a
reflecting surface with nonchiral boundary conditions is completely contained
in the Thomas precession effect, in conformity with the fact that these
boundary conditions are equivalent to an infinite repulsive scalar potential
outside the boundary. By contrast, in the ultrarelativistic limit the rotation
angle in the quantum problem remains finite, while in the classical one the
rotation angle diverges. We comment on the possible implications of this
discrepancy on the validity of the Mathisson-Papapetrou-Dixon equations at
large accelerations.


title: Quantum annealing with ultracold atoms in a multimode optical resonator

abstract:
  A dilutely filled $N$-site optical lattice near zero temperature within a
high-$Q$ multimode cavity can be mapped to a spin ensemble with tailorable
interactions at all length scales. The effective full site to site interaction
matrix can be dynamically controlled by the application of up to $N(N+1)/2$
laser beams of suitable geometry, frequency and power, which allows for the
implementation of quantum annealing dynamics relying on the all-to-all
effective spin coupling controllable in real time. Via an adiabatic sweep
starting from a superfluid initial state one can find the lowest energy
stationary state of this system. As the cavity modes are lossy, errors can be
amended and the ground state can still be reached even from a finite
temperature state via ground state cavity cooling. The physical properties of
the final atomic state can be directly and almost non-destructively read off
from the cavity output fields. As example we simulate a quantum Hopfield
associative memory scheme.


title: Quantum "violation" of Dirichlet boundary condition

abstract:
  Dirichlet boundary conditions have been widely used in general relativity.
They seem at odds with the holographic property of gravity simply because a
boundary configuration can be varying and dynamic instead of dying out as
required by the conditions. In this work we report what should be a tension
between the Dirichlet boundary conditions and quantum gravitational effects,
and show that a quantum-corrected black hole solution of the 1PI action no
longer obeys, in the naive manner one may expect, the Dirichlet boundary
conditions imposed at the classical level. We attribute the `violation' of the
Dirichlet boundary conditions to a certain mechanism of the information storage
on the boundary.


title:
Selection of Input Primitives for the Generalized Label Correcting
  Method

abstract:
  The generalized label correcting method is an efficient search-based approach
to trajectory optimization. It relies on a finite set of control primitives
that are concatenated into candidate control signals. This paper investigates
the principled selection of this set of control primitives. Emphasis is placed
on a particularly challenging input space geometry, the $n$-dimensional sphere.
We propose using controls which minimize a generalized energy function and
discuss the optimization technique used to obtain these control primitives. A
numerical experiment is presented showing a factor of two improvement in
running time when using the optimized control primitives over a random sampling
strategy.


title: Geometry of the word problem for 3-manifold groups

abstract:
  We provide an algorithm to solve the word problem in all fundamental groups
of closed 3-manifolds; in particular, we show that these groups are
autostackable. This provides a common framework for a solution to the word
problem in any closed 3-manifold group using finite state automata.
  We also introduce the notion of a group which is autostackable respecting a
subgroup, and show that a fundamental group of a graph of groups whose vertex
groups are autostackable respecting any edge group is autostackable. A group
that is strongly coset automatic over an autostackable subgroup, using a
prefix-closed transversal, is also shown to be autostackable respecting that
subgroup. Building on work by Antolin and Ciobanu, we show that a finitely
generated group that is hyperbolic relative to a collection of abelian
subgroups is also strongly coset automatic relative to each subgroup in the
collection. Finally, we show that fundamental groups of compact geometric
3-manifolds, with boundary consisting of (finitely many) incompressible torus
components, are autostackable respecting any choice of peripheral subgroup.


title: On the mean field approximation of many-boson dynamics

abstract:
  We show under general assumptions that the mean-field approximation for quan-
tum many-boson systems is correct. Our contribution unifies and improves on
most of the known results. The proof uses general properties of quantization in
infinite dimensional spaces, phase-space analysis and measure transportation
techniques.


title:
The Asymptotic 3-Loop Heavy Flavor Corrections to the Charged Current
  Structure Functions $F_L^{W^+-W^-}(x,Q^2)$ and $F_2^{W^+-W^-}(x,Q^2)$

abstract:
  We calculate the massive Wilson coefficients for the heavy flavor
contributions to the non-singlet charged current deep-inelastic scattering
structure functions $F_L^{W^+}(x,Q^2)-F_L^{W^-}(x,Q^2)$ and
$F_2^{W^+}(x,Q^2)-F_2^{W^-}(x,Q^2)$ in the asymptotic region $Q^2 \gg m^2$ to
3-loop order in Quantum Chromodynamics (QCD) at general values of the Mellin
variable $N$ and the momentum fraction $x$. Besides the heavy quark pair
production, also the single heavy flavor excitation $s \rightarrow c$
contributes. Numerical results are presented for the charm quark contributions
and consequences on the unpolarized Bjorken sum rule and Adler sum rule are
discussed.


title: Berezin symbols on Lie groups

abstract:
  In this paper we present a general framework for Berezin covariant symbols,
and we discuss a few basic properties of the corresponding symbol map, with
emphasis on its injectivity in connection with some problems in representation
theory of nilpotent Lie groups.


title:
Gallai's path decomposition conjecture for graphs of small maximum
  degree

abstract:
  Gallai's path decomposition conjecture states that the edges of any connected
graph on n vertices can be decomposed into at most (n+1)/2 paths. We confirm
that conjecture for all graphs with maximum degree at most five.


title: Separability of Lyapunov Functions for Contractive Monotone Systems

abstract:
  We consider constructing Lyapunov functions for systems that are both
monotone and contractive with respect to a weighted one norm or infinity norm.
This class of systems admits separable Lyapunov functions that are either the
sum or the maximum of a collection of functions of a single argument. In either
case, two classes of separable Lyapunov functions exist: the first class is
separable along the system's state, and the second class is separable along
components of the system's vector field. The latter case is advantageous for
many practically motivated systems for which it is difficult to measure the
system's state but easier to measure the system's velocity or rate of change.
We provide several examples to demonstrate our results.


title:
On the positivity of scattering operators for Poincar\'{e}-Einstein
  manifolds

abstract:
  In this paper, we mainly study the scattering operators for the
Poincar\'{e}-Einstein manifolds. Those operators give the fractional GJMS
operators $P_{2\gamma}$ for the conformal infinity. If a Poincar\'{e}-Einstein
manifolds $(X^{n+1}, g_+)$ is locally conformally flat and there exists an
representative $g$ for the conformal infinity $(M, [g])$ such that the scalar
curvature $R$ is a positive constant and $Q_4>0$, then we prove that
$P_{2\gamma}$ is positive for $\gamma\in (1,2)$ and thus the first real
scattering pole is less than $\frac{n}{2}-2$.


title:
GAdaBoost: Accelerating Adaboost Feature Selection with Genetic
  Algorithms

abstract:
  Boosted cascade of simple features, by Viola and Jones, is one of the most
famous object detection frameworks. However, it suffers from a lengthy training
process. This is due to the vast features space and the exhaustive search
nature of Adaboost. In this paper we propose GAdaboost: a Genetic Algorithm to
accelerate the training procedure through natural feature selection.
Specifically, we propose to limit Adaboost search within a subset of the huge
feature space, while evolving this subset following a Genetic Algorithm.
Experiments demonstrate that our proposed GAdaboost is up to 3.7 times faster
than Adaboost. We also demonstrate that the price of this speedup is a mere
decrease (3%, 4%) in detection accuracy when tested on FDDB benchmark face
detection set, and Caltech Web Faces respectively.


title:
Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems:
  Potentials and Challenges

abstract:
  Non-orthogonal multiple access (NOMA) is one of the promising radio access
techniques for performance enhancement in next-generation cellular
communications. Compared to orthogonal frequency division multiple access
(OFDMA), which is a well-known high-capacity orthogonal multiple access (OMA)
technique, NOMA offers a set of desirable benefits, including greater spectrum
efficiency. There are different types of NOMA techniques, including
power-domain and code-domain. This paper primarily focuses on power-domain NOMA
that utilizes superposition coding (SC) at the transmitter and successive
interference cancellation (SIC) at the receiver. Various researchers have
demonstrated that NOMA can be used effectively to meet both network-level and
user-experienced data rate requirements of fifth-generation (5G) technologies.
From that perspective, this paper comprehensively surveys the recent progress
of NOMA in 5G systems, reviewing the state-of-the-art capacity analysis, power
allocation strategies, user fairness, and user-pairing schemes in NOMA. In
addition, this paper discusses how NOMA performs when it is integrated with
various proven wireless communications techniques, such as cooperative
communications, multiple input multiple output (MIMO), beamforming, space time
coding, and network coding, among others. Furthermore, this paper discusses
several important issues on NOMA implementation and provides some avenues for
future research.


title:
Classification methods for noise transients in advanced
  gravitational-wave detectors II: performance tests on Advanced LIGO data

abstract:
  The data taken by the advanced LIGO and Virgo gravitational-wave detectors
contains short duration noise transients that limit the significance of
astrophysical detections and reduce the duty cycle of the instruments. As the
advanced detectors are reaching sensitivity levels that allow for multiple
detections of astrophysical gravitational-wave sources it is crucial to achieve
a fast and accurate characterization of non-astrophysical transient noise
shortly after it occurs in the detectors. Previously we presented three methods
for the classification of transient noise sources. They are Principal Component
Analysis for Transients (PCAT), Principal Component LALInference Burst (PC-LIB)
and Wavelet Detection Filter with Machine Learning (WDF-ML). In this study we
carry out the first performance tests of these algorithms on gravitational-wave
data from the Advanced LIGO detectors. We use the data taken between the 3rd of
June 2015 and the 14th of June 2015 during the 7th engineering run (ER7), and
outline the improvements made to increase the performance and lower the latency
of the algorithms on real data. This work provides an important test for
understanding the performance of these methods on real, non stationary data in
preparation for the second advanced gravitational-wave detector observation
run, planned for later this year. We show that all methods can classify
transients in non stationary data with a high level of accuracy and show the
benefits of using multiple classifiers.


title:
Capacitance and compressibility of heterostructures with strong
  electronic correlations

abstract:
  Strong electronic correlations related to a repulsive local interaction
suppress the electronic compressibility in a single-band model, and the
capacitance of a corresponding metallic film is directly related to its
electronic compressibility. Both statements may be altered significantly when
two extensions to the system are implemented which we investigate here: (i) we
introduce an attractive nearest-neighbor interaction $V$ as antagonist to the
repulsive on-site repulsion $U$, and (ii) we consider nano-structured
multilayers (heterostructures) assembled from two-dimensional layers of these
systems. We determine the respective total compressibility $\kappa$ and
capacitance $C$ of the heterostructures within a strong coupling evaluation,
which builds on a Kotliar-Ruckenstein slave-boson technique. Whereas the
capacitance $C(n)$ for electronic densities $n$ close to half-filling is
suppressed---illustrated by a correlation induced dip in $C(n)$---it may be
appreciably enhanced close to a van Hove singularity. Moreover, we show that
the capacitance may be a non-monotonic function of $U$ close to half-filling
for both attractive and repulsive $V$. The compressibility $\kappa$ can differ
from $C$ substantially, as $\kappa$ is very sensitive to internal electrostatic
energies which in turn depend on the specific set-up of the heterostructure. In
particular, we show that a capacitor with a polar dielectric has a smaller
electronic compressibility and is more stable against phase separation than a
standard non-polar capacitor with the same capacitance.


title:
Bogoliubov corrections and trace norm convergence for the Hartree
  dynamics

abstract:
  We consider the dynamics of a large number N of nonrelativistic bosons in the
mean field limit for a class of interaction potentials that includes Coulomb
interaction. In order to describe the fluctuations around the mean field
Hartree state, we introduce an auxiliary Hamiltonian on the N-particle space
that is very similar to the one obtained from Bogoliubov theory. We show
convergence of the auxiliary time evolution to the fully interacting dynamics
in the norm of the N-particle space. This result allows us to prove several
other results: convergence of reduced density matrices in trace norm with
optimal rate, convergence in energy trace norm, and convergence to a time
evolution obtained from the Bogoliubov Hamiltonian on Fock space with expected
optimal rate. We thus extend and quantify several previous results, e.g., by
providing the physically important convergence rates, including time-dependent
external fields and singular interactions, and allowing for general initial
states, e.g., those that are expected to be ground states of interacting
systems.


title:
An Ensemble Blocking Scheme for Entity Resolution of Large and Sparse
  Datasets

abstract:
  Entity Resolution, also called record linkage or deduplication, refers to the
process of identifying and merging duplicate versions of the same entity into a
unified representation. The standard practice is to use a Rule based or Machine
Learning based model that compares entity pairs and assigns a score to
represent the pairs' Match/Non-Match status. However, performing an exhaustive
pair-wise comparison on all pairs of records leads to quadratic matcher
complexity and hence a Blocking step is performed before the Matching to group
similar entities into smaller blocks that the matcher can then examine
exhaustively. Several blocking schemes have been developed to efficiently and
effectively block the input dataset into manageable groups. At CareerBuilder
(CB), we perform deduplication on massive datasets of people profiles collected
from disparate sources with varying informational content. We observed that,
employing a single blocking technique did not cover the base for all possible
scenarios due to the multi-faceted nature of our data sources. In this paper,
we describe our ensemble approach to blocking that combines two different
blocking techniques to leverage their respective strengths.


title:
Thirteen Years of Mining Software Repositories (MSR) Conference - What
  is the Bibliography Data Telling Us?

abstract:
  The Mining Software Repositories (MSR) conference is a reputed, long-running
and flagship conference in the area of Software Analytics which has
successfully completed more than one decade as of year 2016. We conduct a
bibliometric and scientific publication mining based study to study how the
conference has evolved over the recent past 13 years (from 2004 to 2007 as a
workshop and then from 2008 to 2016 as a conference). Our objective is to
perform an examination of the state of MSR so that the MSR community can
identify strengths, areas of improvements and future directions for the
conference.


title: Quasi-Periodic Intermittency in Oscillating Cylinder Flow

abstract:
  Fluid dynamics induced by periodically forced flow around a cylinder is
analyzed computationally for the case when the forcing frequency is much lower
than the von K{\'a}rm{\'a}n vortex shedding frequency corresponding to the
constant flow velocity condition. By using the Koopman Mode Decomposition
approach, we find a new normal form equation that extends the classical Hopf
bifurcation normal form by a time-dependent term for Reynolds numbers close to
the Hopf bifurcation value. The normal form describes the dynamics of an
observable and features a forcing (control) term that multiplies the state, and
is thus a parametric - i.e. not an additive - forcing effect. We find that the
dynamics of the flow in this regime are characterized by alternating instances
of quiescent and strong oscillatory behavior, and that this pattern persists
indefinitely. Furthermore, the spectrum of the associated Koopman operator is
shown to possess quasi-periodic features. We establish the theoretical
underpinnings of this phenomenon -- that we name Quasi-Periodic Intermittency
-- using the new normal form model and show that the dynamics are caused by the
tendency of the flow to oscillate between the unstable fixed point and the
stable limit cycle of the unforced flow. The quasi-periodic intermittency
phenomena is also characterized by positive Finite-Time Lyapunov Exponents
that, over a long period of time, asymptotically approach zero.


title: Semantic Similarity Strategies for Job Title Classification

abstract:
  Automatic and accurate classification of items enables numerous downstream
applications in many domains. These applications can range from faceted
browsing of items to product recommendations and big data analytics. In the
online recruitment domain, we refer to classifying job ads to pre-defined or
custom occupation categories as job title classification. A large-scale job
title classification system can power various downstream applications such as
semantic search, job recommendations and labor market analytics. In this paper,
we discuss experiments conducted to improve our in-house job title
classification system. The classification component of the system is composed
of a two-stage coarse and fine level classifier cascade that classifies input
text such as job title and/or job ads to one of the thousands of job titles in
our taxonomy. To improve classification accuracy and effectiveness, we
experiment with various semantic representation strategies such as average W2V
vectors and document similarity measures such as Word Movers Distance (WMD).
Our initial results show an overall improvement in accuracy of Carotene[1].


title: Can non-local correlations be discriminated in polynomial time?

abstract:
  In view of the importance of quantum non-locality in cryptography, quantum
computation and communication complexity, it is crucial to decide whether a
given correlation exhibits non-locality or not. In the light of a theorem by
Pitowski, it is generally believed that this problem is computationally
intractable. In this paper, we first prove that the Euclidean distance of given
correlations from the local polytope can be computed in polynomial time with
arbitrary fixed error, granted the access to a certain oracle. Namely, given a
fixed error, we derive two upper bounds on the running time. The first bound is
linear in the number of measurements. The second bound scales as the number of
measurements to the sixth power. The former is dominant only for a very high
number of measurements and is never saturated in the performed numerical tests.
We then introduce a simple algorithm for simulating the oracle. In all the
considered numerical tests, the simulation of the oracle contributes with a
multiplicative factor to the overall running time and, thus, does not affect
the sixth-power law of the oracle-assisted algorithm.


title: Can NDN Perform Better than OLSR in Wireless Ad Hoc Networks?

abstract:
  The emerging paradigm of Information-Centric Networking is an exciting field
of research, opening opportunities in many areas, such as forwarding
strategies, caching placement policies, applications (e.g. video streaming and
instant messaging), to name a few. In this paper, we address the mobility
aspect of ICN, as well as how it performs in tactical wireless ad hoc
environments. In this paper, we present results from a simulation study that
investigates the performance of Named Data Networking, an instantiation of ICN,
in such environments. We perform a series of simulations based on ndnSIM
studying different mobility scenarios. Our simulations show that even in the
short-term absence of the producer, consumers can still achieve better file
retrieval when caches are used. As an effort to increase the cache diversity
and have a better utilization of the Content Store we study probabilistic LRU.
Furthermore, we compare the performance of our NDN network with a TCP based
approach, using OLSR routing protocol, discussing advantages and disadvantages
of each approach.


title: On W algebras commuting with a set of screenings

abstract:
  We consider the problem of classification of all W algebras which commute
with a set of exponential screening operators. Assuming that the W algebra has
a nontrivial current of spin 3, we find equations satisfied by the screening
operators and classify their solutions.


title:
The maximal excess charge for a family of density-matrix-functional
  theories including Hartree-Fock and M\"uller theories

abstract:
  We will give a proof that the maximal excess charge for an atom described by
a family of density-matrix-functionals, which includes Hartree-Fock and
M\"uller theories, is bounded by an universal constant. We will use the new
technique introduced by Frank et al (arXiv:1608.05625 [math-ph]).


title:
Temperature dependence of the probability of "small heating" and
  spectrum of UCNs up-scattered on the surface of Fomblin oil Y-HVAC 18/8

abstract:
  We performed precision measurements of the probability of small heating and
spectrum of UCNs up-scattered on the surface of hydrogen-free oil Fomblin
Y-HVAC 18/8 as a function of temperature. The probability is well reproducible,
does not depend on sample thickness and does not evolve in time. It is equal
(9.8+-0.2)10^(-6) at the ambient temperature. The spectrum coincides with those
measured with solid-surface and nanoparticle samples. Indirect arguments
indicate that spectrum shape weakly depends on temperature. Measured
experimental data can be satisfactory described both within the model of
near-surface nanodroplets and the model of capillary waves.


title: Cotangent cohomology of quadratic monomial ideals

abstract:
  We study the deformation theory of quotients of polynomial rings by quadratic
monomial ideals. More precisely we compute the first cotangent cohomology
module of such rings. We also give a criterion for vanishing of second
cotangent cohomology module.


title: Pseudocompact C$^*$-algebras

abstract:
  We study the class of pseudocompact C*-algebras, which are the logical limits
of finite-dimensional C*-algebras. The pseudocompact C*-algebras are unital,
stably finite, real rank zero, stable rank one, and tracial. We show that the
pseudocompact C*-algebras have trivial K_1 groups and the Dixmier property. The
class is stable under direct sums, tensoring by finite-dimensional C*-algebras,
taking corners, and taking centers. We give an explicit axiomatization of the
commutative pseudocompact C*-algebras. We also study the subclass of
pseudomatricial C*-algebras, which have unique tracial states, strict
comparison of projections, and trivial centers. We give some information about
the K_0 groups of the pseudomatricial C*-algebras.


title: A Hodge - De Rham Dirac operator on the quantum ${\rm SU}(2)$

abstract:
  We describe how it is possible to describe irreducible actions of the Hodge -
de Rham Dirac operator upon the exterior algebra over the quantum spheres ${\rm
SU}_q(2)$ equipped with a three dimensional left covariant calculus.


title:
Design of Admissible Heuristics for Kinodynamic Motion Planning via
  Sum-of-Squares Programming

abstract:
  How does one obtain an admissible heuristic for a kinodynamic motion planning
problem? This paper develops the analytical tools and techniques to answer this
question. A sufficient condition for the admissibility of a heuristic is
presented which can be checked directly from the problem data. This condition
is also used to formulate a concave program to optimize an admissible
heuristic. This optimization is then approximated and solved in polynomial time
using sum-of-squares programming techniques. A number of examples are provided
to demonstrate these concepts.


title:
Stellar longitudinal magnetic field determination through multi-Zeeman
  signatures

abstract:
  Context. A lot of effort has been put into the detection and determination of
stellar magnetic fields using the spectral signal obtained from the combination
of hundreds or thousands of individual lines, an approach known as multi-line
techniques. However, so far most of multi-line techniques developed that
retrieve stellar mean longitudinal magnetic fields recourse to sometimes heavy
simplifications concerning line shapes and Zeeman splittings.
  Aims. To determine stellar longitudinal magnetic fields by means of the
Principal Components Analysis and Zeeman Doppler Imaging (PCA-ZDI) multi-line
technique, based on accurate polarised spectral line synthesis.
  Methods. In this paper we present the methodology to perform inversions of
profiles obtained with PCA-ZDI.
  Results. Inversions with various magnetic geometries, field strengths and
rotational velocities show that we can correctly determine the effective
longitudinal magnetic field in stars using the PCA-ZDI method.