title: A domain with non-plurisubharmonic squeezing function

abstract:
  We construct a strictly pseudoconvex domain with smooth boundary whose
squeezing function is not plurisubharmonic.


title: Which Way?

abstract:
  I report the result of a which-way experiment based on Young's double-slit
experiment. It reveals which slit photons go through while retaining the (self)
interference of all the photons collected. The idea is to image the slits using
a lens with a narrow aperture and scan across the area where the interference
fringes would be. The aperture is wide enough to separate the slits in the
images, i.e., telling which way. The illumination pattern over the pupil is
reconstructed from the series of slit intensities. The result matches the
double-slit interference pattern well. As such, the photon's wave-like and
particle-like behaviors are observed simultaneously in a straightforward and
thus unambiguous way. The implication is far reaching. For one, it presses
hard, at least philosophically, for a consolidated wave-and-particle
description of quantum objects, because we can no longer dismiss such a
challenge on the basis that the two behaviors do not manifest at the same time.
A bold proposal is to forgo the concept of particles. Then, Heisenberg's
uncertainty principle would be purely a consequence of waves without being
ordained upon particles.


title: Bisecting and D-secting families for set systems

abstract:
  Let $n$ be any positive integer and $\mathcal{F}$ be a family of subsets of
$[n]$.
  A family $\mathcal{F}'$ is said to be $D$-\emph{secting} for $\mathcal{F}$ if
for every $A \in \mathcal{F}$, there exists a subset $A' \in \mathcal{F}'$ such
that $|A \cap A'| - |A \cap ([n] \setminus A')|=i$, where $i \in D$, $D
\subseteq \{-n,-n+1,\ldots,0,\ldots,n\}$.
  A $D$-\emph{secting} family $\mathcal{F}'$ of $\mathcal{F}$, where
$D=\{-1,0,1\}$, is a \emph{bisecting} family ensuring the existence of a subset
$A' \in \mathcal{F}'$ such that $|A \cap A'| \in \{\lceil
\frac{|A|}{2}\rceil,\lfloor \frac{|A|}{2}\rfloor\}$, for each $A \in
\mathcal{F}$.
  In this paper, we study $D$-secting families for $\mathcal{F}$ with
restrictions on $D$, and the cardinalities of $\mathcal{F}$ and the subsets of
$\mathcal{F}$.


title:
Transport between two fluids across their mutual flow interface: the
  streakline approach

abstract:
  Mixing between two different miscible fluids with a mutual interface must be
initiated by fluid transporting across this fluid interface, caused for example
by applying an unsteady velocity agitation. In general, there is no necessity
for this physical flow barrier between the fluids to be associated with
extremal or exponential attraction as might be revealed by applying Lagrangian
coherent structures, finite-time Lyapunov exponents or other methods on the
fluid velocity. It is shown that streaklines are key to understanding the
breaking of the interface under velocity agitations, and a theory for locating
the relevant streaklines is presented. Simulations of streaklines in a
cross-channel mixer and a perturbed Kirchhoff's elliptic vortex are
quantitatively compared to the theoretical results. A methodology for
quantifying the unsteady advective transport between the two fluids using
streaklines is presented.


title:
In-gap excitation effect on a superexchange in La2CuO4 by creating
  nonequilibrium photoexcited centers

abstract:
  We propose a multielectron approach to calculate superexchange interaction in
magnetic Mott- Hubbard insulator La2CuO4(further La214) that allows to obtain
the effect of optical pumping on the superexchange interaction. We use the cell
perturbation theory with exact diagonalization of the multiband pd Hamiltonian
inside each CuO6 unit cell and treating the intercell hopping as perturbation.
To incorporate effect of optical pumping we include in this work the excited
singlehole local states as well as all two-hole singlets and triplets. By
projecting out the interband intercell electron hopping we have obtained the
effective Heisenberg-like Hamiltonian with the local spin at site Ri being a
superposition of the ground and excited single-hole states. We found that
antiferromagnetic contribution to the exchange energy in La214 will increase in
accordance to ~ 4*10_{-3} eV /(%) at the resonance light occupation of the
excited single hole in-gap state.


title: A Focused Dynamic Attention Model for Visual Question Answering

abstract:
  Visual Question and Answering (VQA) problems are attracting increasing
interest from multiple research disciplines. Solving VQA problems requires
techniques from both computer vision for understanding the visual contents of a
presented image or video, as well as the ones from natural language processing
for understanding semantics of the question and generating the answers.
Regarding visual content modeling, most of existing VQA methods adopt the
strategy of extracting global features from the image or video, which
inevitably fails in capturing fine-grained information such as spatial
configuration of multiple objects. Extracting features from auto-generated
regions -- as some region-based image recognition methods do -- cannot
essentially address this problem and may introduce some overwhelming irrelevant
features with the question. In this work, we propose a novel Focused Dynamic
Attention (FDA) model to provide better aligned image content representation
with proposed questions. Being aware of the key words in the question, FDA
employs off-the-shelf object detector to identify important regions and fuse
the information from the regions and global features via an LSTM unit. Such
question-driven representations are then combined with question representation
and fed into a reasoning unit for generating the answers. Extensive evaluation
on a large-scale benchmark dataset, VQA, clearly demonstrate the superior
performance of FDA over well-established baselines.


title: On n-Trivial Extensions of Rings

abstract:
  The notion of trivial extension of a ring by a module has been extensively
studied and used in ring theory as well as in various other areas of research
like cohomology theory, representation theory, category theory and homological
algebra. In this paper we extend this classical ring construction by
associating a ring to a ring $R$ and a family $M=(M_i)_{i=1}^{n}$ of $n$
$R$-modules for a given integer $n\geq 1$. We call this new ring construction
an $n$-trivial extension of $R$ by $M$. In particular, the classical trivial
extension will be just the $1$-trivial extension. Thus we generalize several
known results on the classical trivial extension to the setting of $n$-trivial
extensions and we give some new ones. Various ring-theoretic constructions and
properties of $n$-trivial extensions are studied and a detailed investigation
of the graded aspect of $n$-trivial extensions is also given. We end the paper
with an investigation of various divisibily properties of $n$-trivial
extensions. In this context several open questions arise.


title:
Brownian motion of a matter-wave bright soliton: realizing a quantum
  pollen grain

abstract:
  Taking an open quantum systems approach, we derive a collective equation of
motion for the dynamics of a matter-wave bright soliton moving through a
thermal cloud of a distinct atomic species. The reservoir interaction involves
energy transfer without particle transfer between the soliton and thermal
cloud, thus damping the soliton motion without altering its stability against
collapse. We derive a Langevin equation for the soliton centre of mass velocity
in the form of an Ornstein-Uhlenbeck process with analytical drift and
diffusion coefficients. This collective motion is confirmed by simulations of
the full stochastic projected Gross-Pitaevskii equation for the matter-wave
field. The system offers a pathway for experimentally observing the elusive
energy-damping reservoir interaction, and a clear realization of collective
Brownian motion for a mesoscopic superfluid droplet.

categories: cond-mat.quant-gas cond-mat.stat-mech physics.atom-ph quant-ph


title:
An exacting transition probability measurement - a direct test of atomic
  many-body theories

abstract:
  A new protocol for measuring the branching fraction of hydrogenic atoms with
only statistically limited uncertainty is proposed and demonstrated for the
decay of the P$_{3/2}$ level of the barium ion, with precision below $0.5\%$.
Heavy hydrogenic atoms like the barium ion are test beds for fundamental
physics such as atomic parity violation and they also hold the key to
understanding nucleo-synthesis in stars. To draw definitive conclusion about
possible physics beyond the standard model by measuring atomic parity violation
in the barium ion it is necessary to measure the dipole transition
probabilities of low-lying excited states with precision better than $1\%$.
Furthermore, enhancing our understanding of the $\it{barium-puzzle}$ in barium
stars requires branching fraction data for proper modelling of
nucleo-synthesis. Our measurements are the first to provide a direct test of
quantum many-body calculations on the barium ion with precision below one
percent and more importantly with no known systematic uncertainties. The unique
measurement protocol proposed here can be easily extended to any decay with
more than two channels and hence paves the way for measuring the branching
fractions of other hydrogenic atoms with no significant systematic
uncertainties.


title: Constraints on mixed dark matter from anomalous strong lens systems

abstract:
  Recently it has been claimed that the warm dark matter (WDM) model cannot at
the same time reproduce the observed Lyman-{\alpha} forests in distant quasar
spectra and solve the small-scale issues in the cold dark matter (CDM) model.
As an alternative candidate, it was shown that the mixed dark matter (MDM)
model that consists of WDM and CDM can satisfy the constraint from
Lyman-{\alpha} forests and account for the "missing satellite problem" as well
as the reported 3.5 keV anomalous X-ray line. We investigate observational
constraints on the MDM model using strong gravitational lenses. We first
develop a fitting formula for the nonlinear power spectra in the MDM model by
performing N-body simulations and estimate the expected perturbations caused by
line-of-sight structures in four quadruply lensed quasars that show anomaly in
the flux ratios. Our analysis indicates that the MDM model is compatible with
the observed anomaly if the mass fraction of the warm component is smaller than
0.47 at the 95% confidence level. The MDM explanation to the anomalous X-ray
line and the small-scale issues is still viable even after this constraint is
taken into account.


title: Radii of neutron drops probed via the neutron skin thickness of nuclei

abstract:
  Multi-neutron systems are crucial to understanding the physics of
neutron-rich nuclei and neutron stars. Neutron drops, neutrons confined in an
external field, are investigated systematically in both non-relativistic and
relativistic density functional theories and with ab initio calculations. We
demonstrate a strong linear correlation, which is universal in the realm of
mean-field models, between the rms radii of neutron drops and the neutron skin
thickness of Pb-208 and Ca-48; i.e., the difference between the neutron and
proton rms radii of a nucleus. Due to its high quality, this correlation can be
used to deduce the radii of neutron drops from the measured neutron skin
thickness in a model-independent way, and the radii obtained for neutron drops
can provide a useful constraint for realistic three neutron forces. This
correlation, together with high- precision measurements of the neutron skin
thicknesses of Pb-208 and Ca-48, will have an enduring impact on the
understanding of multi-neutron interactions, neutron-rich nuclei, neutron
stars, etc.


title: Asymptotics of random domino tilings of rectangular Aztec diamonds

abstract:
  We consider asymtotics of a domino tiling model on a class of domains which
we call rectangular Aztec diamonds. We prove the Law of Large Numbers for the
corresponding height functions and provide explicit formulas for the limit. For
a special class of examples, the explicit parametrization of the frozen
boundary is given. It turns out to be an algebraic curve with very special
properties. Moreover, we establish the convergence of the fluctuations to the
Gaussian Free Field in appropriate coordinates. Our main tool is a recently
developed moment method for discrete particle systems.


title: Self-Seeded FEL Wavelength Extension with High-Gain Harmonic Generation

abstract:
  We study a self-seeded high-gain harmonic generation (HGHG) free-electron
laser (FEL) scheme to extend the wavelength of a soft X-ray FEL. This scheme
uses a regular self-seeding monochromator to generate a seed laser at the
wavelength of 1.52 nm, followed by a HGHG configuration to produce coherent,
narrow-bandwidth harmonic radiations at the GW level. The 2nd and 3rd harmonic
radiation are investigated with start-to-end simulations. Detailed studies on
the FEL performance and shot-to-shot fluctuations are presented.


title:
The effect of anisotropy of long-range hopping on localization in
  three-dimensional lattices

abstract:
  It has become widely accepted that particles with long-range hopping do not
undergo Anderson localization. However, several recent studies demonstrated
localization of particles with long-range hopping. In particular, it was
recently shown that the effect of long-range hopping in 1D lattices can be
mitigated by cooperative shielding, which makes the system behave effectively
as one with short-range hopping. Here, we show that cooperative shielding,
demonstrated previously for 1D lattices, extends to 3D lattices with isotropic
long-range $r^{-\alpha}$ hopping, but not to 3D lattices with dipolar-like
anisotropic long-range hopping. We demonstrate the presence of localization in
3D lattices with uniform ($\alpha=0$) isotropic long-range hopping and the
absence of localization with uniform anisotropic long-range hopping by using
the scaling behaviour of eigenstate participation ratios. We use the scaling
behaviour of participation ratios and energy level statistics to show that the
existence of delocalized, non-ergodic extended, or localized states in the
presence of disorder depends on both the exponents $\alpha$ and the isotropy of
the long-range hopping amplitudes.


title:
Sommerfeld enhancement of invisible dark matter annihilation in galaxies
  and galaxy clusters

abstract:
  Recent observations indicate that core-like dark matter structures exist in
many galaxies, while numerical simulations reveal a singular dark matter
density profile at the center. In this article, I show that if the annihilation
of dark matter particles gives invisible sterile neutrinos, the Sommerfeld
enhancement of the annihilation cross-section can give a sufficiently large
annihilation rate to solve the core-cusp problem. The resultant core density,
core radius, and their scaling relation generally agree with recent empirical
fits from observations. Also, this model predicts that the resultant core-like
structures in dwarf galaxies can be easily observed, but not for large normal
galaxies and galaxy clusters.


title:
Parameterized Analysis of Multi-objective Evolutionary Algorithms and
  the Weighted Vertex Cover Problem

abstract:
  A rigorous runtime analysis of evolutionary multi-objective optimization for
the classical vertex cover problem in the context of parameterized complexity
analysis has been presented by Kratsch and Neumann (2013). In this paper, we
extend the analysis to the weighted vertex cover problem and provide a fixed
parameter evolutionary algorithm with respect to OPT, the cost of the the
optimal solution for the problem. Moreover, using a diversity mechanisms, we
present a multi-objective evolutionary algorithm that finds a 2-approximation
in expected polynomial time and introduce a population-based evolutionary
algorithm which finds a $(1+\varepsilon)$-approximation in expected time
$O(n\cdot 2^{\min \{n,2(1- \varepsilon)OPT \}} + n^3)$.


title: BSE-property for some certain Segal and Banach algebras

abstract:
  For a commutative semi-simple Banach algebra ${A}$ which is an ideal in its
second dual we give a necessary and sufficient condition for an essential
abstract Segal algebra in ${A}$ to be a BSE-algebra. We show that a large class
of abstract Segal algebras in the Fourier algebra $A(G)$ of a locally compact
group $G$ are BSE-algebra if and only if they have bounded weak approximate
identities. Also, in the case that $G$ is discrete we show that $A_{\rm cb}(G)$
is a BSE-algebra if and only if $G$ is weakly amenable. We study the
BSE-property of some certain Segal algebras implemented by local functions that
were recently introduced by J. Inoue and S.-E. Takahasi. Finally we give a
similar construction for the group algebra implemented by a measurable and
sub-multiplicative function.


title:
How Does the Low-Rank Matrix Decomposition Help Internal and External
  Learnings for Super-Resolution

abstract:
  Wisely utilizing the internal and external learning methods is a new
challenge in super-resolution problem. To address this issue, we analyze the
attributes of two methodologies and find two observations of their recovered
details: 1) they are complementary in both feature space and image plane, 2)
they distribute sparsely in the spatial space. These inspire us to propose a
low-rank solution which effectively integrates two learning methods and then
achieves a superior result. To fit this solution, the internal learning method
and the external learning method are tailored to produce multiple preliminary
results. Our theoretical analysis and experiment prove that the proposed
low-rank solution does not require massive inputs to guarantee the performance,
and thereby simplifying the design of two learning methods for the solution.
Intensive experiments show the proposed solution improves the single learning
method in both qualitative and quantitative assessments. Surprisingly, it shows
more superior capability on noisy images and outperforms state-of-the-art
methods.


title: Asymptotic Plateau Problem in H2xR

abstract:
  We give a fairly complete solution to the asymptotic Plateau Problem for area
minimizing surfaces in H2xR. In particular, we identify the collection of
Jordan curves in the asymptotic boundary of H2xR, which bounds an area
minimizing surface in H2xR. Furthermore, we study the similar problem for
minimal surfaces, and show that the situation is highly different.


title: The amplitudes and the structure of the charge density wave in YBCO

abstract:
  We find unknown $s$- and $d$-wave amplitudes of the recently discovered
charge density wave (CDW) in underdoped cuprates. To do so we perform a
combined analysis of experimental data for ortho-II YBa$_2$Cu$_3$O$_{y}$. The
analysis includes data on nuclear magnetic resonance, resonant inelastic X-ray
scattering, and hard X-ray diffraction. The amplitude of doping modulation
found in our analysis is $3.5\cdot 10^{-3}$ in a low magnetic field and
$T=60$K, the amplitude is $6.5\cdot 10^{-3}$ in a magnetic field of 30T and
$T=1.3$K. The values are in units of elementary charge per unit cell of a
CuO$_2$ plane. We show that the data rule out a checkerboard pattern, and we
also show that the data might rule out mechanisms of the CDW which do not
include phonons.


title: LOMo: Latent Ordinal Model for Facial Analysis in Videos

abstract:
  We study the problem of facial analysis in videos. We propose a novel weakly
supervised learning method that models the video event (expression, pain etc.)
as a sequence of automatically mined, discriminative sub-events (eg. onset and
offset phase for smile, brow lower and cheek raise for pain). The proposed
model is inspired by the recent works on Multiple Instance Learning and latent
SVM/HCRF- it extends such frameworks to model the ordinal or temporal aspect in
the videos, approximately. We obtain consistent improvements over relevant
competitive baselines on four challenging and publicly available video based
facial analysis datasets for prediction of expression, clinical pain and intent
in dyadic conversations. In combination with complimentary features, we report
state-of-the-art results on these datasets.


title:
Robust Controllers for Regular Linear Systems with Infinite-Dimensional
  Exosystems

abstract:
  We construct two error feedback controllers for robust output tracking and
disturbance rejection of a regular linear system with nonsmooth reference and
disturbance signals. We show that for sufficiently smooth signals the output
converges to the reference at a rate that depends on the behaviour of the
transfer function of the plant on the imaginary axis. In addition, we construct
a controller that can be designed to achieve robustness with respect to a given
class of uncertainties in the system, and present a novel controller structure
for output tracking and disturbance rejection without the robustness
requirement. We also generalize the internal model principle for regular linear
systems with boundary disturbance and for controllers with unbounded input and
output operators. The construction of controllers is illustrated with an
example where we consider output tracking of a nonsmooth periodic reference
signal for a two-dimensional heat equation with boundary control and
observation, and with periodic disturbances on the boundary.


title:
Distinct and repeated distances on a surface and incidences between
  points and spheres

abstract:
  In this paper we show that the number of distinct distances determined by a
set of $n$ points on a constant-degree two-dimensional algebraic variety $V$
(i.e., a surface) in $\mathbb R^3$ is at least $\Omega\left(n^{7/9}/{\rm
polylog} \,n\right)$. This bound is significantly larger than the conjectured
bound $\Omega(n^{2/3})$ for general point sets in $\mathbb R^3$.
  We also show that the number of unit distances determined by $n$ points on a
surface $V$, as above, is $O(n^{4/3})$, a bound that matches the best known
planar bound, and is worst-case tight in 3-space. This is in sharp contrast
with the best known general bound $O(n^{3/2})$ for points in three dimensions.
  To prove these results, we establish an improved upper bound for the number
of incidences between a set $P$ of $m$ points and a set $S$ of $n$ spheres, of
arbitrary radii, in $\mathbb R^3$, provided that the points lie on an algebraic
surface $V$ of constant degree, which does not have linear or spherical
components. Specifically, the bound is $$ O\left( m^{2/3}n^{2/3} +
m^{1/2}n^{7/8}\log^\beta(m^4/n) + m + n + \sum_{c} |P_{c}|\cdot |S_{c}| \right)
, $$ where the constant of proportionality and the constant exponent $\beta$
depend on the degree of $V$, and where the sum ranges over all circles $c$ that
are fully contained in $V$, so that, for each such $c$, $P_c = P\cap c$ and
$S_c$ is the set of the spheres of $S$ that contain $c$. In addition, $\sum_{c}
|P_{c}| = O(m)$ and $\sum_{c} |S_{c}| = O(n)$. This bound too improves upon
earlier known bounds. These have been obtained for arbitrary point sets but
only under severe restrictions about the spheres, which are dropped in our
result. Another interesting application of our result is an incidence bound for
arbitrary points and spheres in 3-space, where we improve and generalize the
previous work of Apfelbaum and Sharir[AS].


title:
A measurement of the time profile of scintillation induced by low energy
  gamma-rays in liquid xenon with the XMASS-I detector

abstract:
  We report the measurement of the emission time profile of scintillation from
gamma-ray induced events in the XMASS-I 832 kg liquid xenon scintillation
detector. Decay time constant was derived from a comparison of scintillation
photon timing distributions between the observed data and simulated samples in
order to take into account optical processes such as absorption and scattering
in liquid xenon. Calibration data of radioactive sources, $^{55}$Fe,
$^{241}$Am, and $^{57}$Co were used to obtain the decay time constant. Assuming
two decay components, $\tau_1$ and $\tau_2$, the decay time constant $\tau_2$
increased from 27.9 ns to 37.0 ns as the gamma-ray energy increased from 5.9
keV to 122 keV. The accuracy of the measurement was better than 1.5 ns at all
energy levels. A fast decay component with $\tau_1 \sim 2$ ns was necessary to
reproduce data. Energy dependencies of $\tau_2$ and the fraction of the fast
decay component were studied as a function of the kinetic energy of electrons
induced by gamma-rays. The obtained data almost reproduced previously reported
results and extended them to the lower energy region relevant to direct dark
matter searches.

categories: physics.ins-det astro-ph.CO hep-ex nucl-ex


title:
Integrating NOE and RDC using sum-of-squares relaxation for protein
  structure determination

abstract:
  We revisit the problem of protein structure determination from geometrical
restraints from NMR, using convex optimization. It is well-known that the
NP-hard distance geometry problem of determining atomic positions from pairwise
distance restraints can be relaxed into a convex semidefinite program. Often
the NOE distance restraints are too imprecise and sparse for accurate structure
determination. Residual dipolar coupling (RDC) measurements provide additional
geometric information on the angles between atom-pair directions and axes of
the principal-axis-frame. The optimization problem involving RDC is highly
non-convex and requires a good initialization even within the simulated
annealing framework. In this paper, we model the protein backbone as an
articulated structure composed of rigid units. Determining the rotation of each
rigid unit gives the full protein structure. We propose solving the non-convex
optimization problems using the sum-of-squares (SOS) hierarchy. The two
algorithms - RDC-SOS and RDC-NOE-SOS, have polynomial time complexity in the
number of amino-acid residues and run efficiently on a standard desktop. In
many instances, the proposed methods exactly recover the solution to the
original non-convex optimization problem. We introduce a statistical tool, the
Cramer-Rao bound (CRB), to provide an information theoretic bound on the
highest resolution one can hope to achieve when determining protein structure
from noisy measurements using any methodology. Our simulation results show that
when the RDC measurements are corrupted by Gaussian noise of realistic
variance, both SOS based algorithms attain the CRB. We successfully apply our
method in a divide-and-conquer fashion to determine the structure of ubiquitin
from experimental NOE and RDC measurements, achieving more accurate and faster
reconstructions compared to the current state of the art.


title:
The selective effect of environment on the atomic and molecular
  gas-to-dust ratio of nearby galaxies in the Herschel Reference Survey

abstract:
  We combine dust, atomic (HI) and molecular (H$_{2}$) hydrogen mass
measurements for 176 galaxies in the Herschel Reference Survey to investigate
the effect of environment on the gas-to-dust mass ($M_{\rm gas}/M_{\rm dust}$)
ratio of nearby galaxies. We find that, at fixed stellar mass, the average
$M_{\rm gas}/M_{\rm dust}$ ratio varies by no more than a factor of $\sim$2
when moving from field to cluster galaxies, with Virgo galaxies being slightly
more dust rich (per unit of gas) than isolated systems. Remarkably, once the
molecular and atomic hydrogen phases are investigated separately, we find that
\hi-deficient galaxies have at the same time lower $M_{\rm HI}/M_{\rm dust}$
ratio but higher $M_{\rm H_{2}}/M_{\rm dust}$ ratio than \hi-normal systems. In
other words, they are poorer in atomic but richer in molecular hydrogen if
normalized to their dust content. By comparing our findings with the
predictions of theoretical models, we show that the opposite behavior observed
in the $M_{\rm HI}/M_{\rm dust}$ and $M_{\rm H_{2}}/M_{\rm dust}$ ratios is
fully consistent with outside-in stripping of the interstellar medium (ISM),
and is simply a consequence of the different distribution of dust, \hi\ and
H$_{2}$ across the disk. Our results demonstrate that the small environmental
variations in the total $M_{\rm gas}/M_{\rm dust}$ ratio, as well as in the
gas-phase metallicity, do not automatically imply that environmental mechanisms
are not able to affect the dust and metal content of the ISM in galaxies.


title: Log canonical thresholds and Monge-Ampere masses

abstract:
  In this paper, we prove an inequality for log canonical thresholds and
Monge-Ampere masses. The idea of proof is a combination of the Ohsawa-Takegoshi
$L^2$-extension theorem and inequalities in [ACKHZ09], [DH14]. It also give an
analytic proof for the main result in [DH14] in the case of dimension 2.


title: Robotic manipulation of a rotating chain

abstract:
  This paper considers the problem of manipulating a uniformly rotating chain:
the chain is rotated at a constant angular speed around a fixed axis using a
robotic manipulator. Manipulation is quasi-static in the sense that transitions
are slow enough for the chain to be always in "rotational" equilibrium. The
curve traced by the chain in a rotating plane -- its shape function -- can be
determined by a simple force analysis, yet it possesses complex multi-solutions
behavior typical of non-linear systems. We prove that the configuration space
of the uniformly rotating chain is homeomorphic to a two-dimensional surface
embedded in $\mathbb{R}^3$. Using that representation, we devise a manipulation
strategy for transiting between different rotation modes in a stable and
controlled manner. We demonstrate the strategy on a physical robotic arm
manipulating a rotating chain. Finally, we discuss how the ideas developed here
might find fruitful applications in the study of other flexible objects, such
as elastic rods or concentric tubes.


title:
Effective numbers of charge carriers in doped graphene: The generalized
  Fermi liquid approach

abstract:
  The single-band current-dipole Kubo formula for the dynamical conductivity of
heavily doped graphene from Kup\v{c}i\'{c} [Phys. Rev. B 91, 205428 (2015)] is
extended to a two-band model for conduction $\pi$ electrons in lightly doped
graphene. Using a posteriori relaxation-time approximation in the two-band
quantum transport equations, with two different relaxation rates and one
quasi-particle lifetime, we explain a seemingly inconsistent dependence of the
dc conductivity $\sigma^{\rm dc}_{\alpha \alpha}$ of ultraclean and dirty
lightly doped graphene samples on electron doping, in a way consistent with the
charge continuity equation. It is also shown that the intraband contribution to
the effective number of conduction electrons in $\sigma^{\rm dc}_{\alpha
\alpha}$ vanishes at $T=0$ K in the ultraclean regime, but it remains finite in
the dirty regime. The present model is shown to be consistent with a picture in
which the intraband and interband contributions to $\sigma^{\rm dc}_{\alpha
\alpha}$ are characterized by two different mobilities of conduction electrons,
the values of which are well below the widely accepted value of mobility in
ultraclean graphene. The dispersions of Dirac and $\pi$ plasmon resonances are
reexamined to show that the present, relatively simple expression for the
dynamical conductivity tensor can be used to study simultaneously
single-particle excitations in the dc and optical conductivity and collective
excitations in energy loss spectroscopy experiments.


title:
Complex Formation between Polyelectrolytes and Oppositely Charged
  Oligoelectrolytes

abstract:
  We study the complex formation between one long polyanion chain and many
short oligocation chains by computer simulations. We employ a coarse-grained
bead-spring model for the polyelectrolyte chains, and model explicitly the
small salt ions. We systematically vary the concentration and the length of the
oligocation, and examine how the oligocations affects the chain conformation,
the static structure factor, the radial and axial distribution of various
charged species, and the number of bound ions in the complex. At low
oligocation concentration, the polyanion has an extended structure. Upon
increasing the oligocation concentration, the polyanion chain collapses and
forms a compact globule, but the complex still carries a net negative charge.
Once the total charge of the oligocations is equal to that of the polyanion,
the collapse stops and is replaced by a slow expansion. In this regime, the net
charge on the complexes is positive or neutral, depending on the microion
concentration in solution. The expansion can be explained by the reduction of
the oligocation bridging. We find that the behavior and the structure of the
complex are largely independent of the length of oligocations, and very similar
to that observed when replacing the oligocations by multivalent salt cations,
and conclude that the main driving force keeping the complex together is the
release of monovalent counterions and coions. We speculate on the implications
of this finding for the problem of controlled oligolyte release and oligolyte
substitution.


title: Dark Post-Flare Loops Observed by Solar Dynamics Observatory

abstract:
  Solar post-flare loops (PFLs) are arcade-like loop systems that appear during
the gradual phases of eruptive flares. The extreme ultraviolet (EUV)
observations from the Atmospheric Imaging Assembly (AIA) on board the Solar
Dynamics Observatory (SDO) allow us to investigate the fine structures in PFLs.
In this work, we focus on studying the dark post-flare loops (DPFLs) during
X-class flares, which are more evident in SDO/AIA data than in previous EUV
data. We identify and analyze the DPFLs observed by SDO and find that: (1) the
DPFLs of an X5.4 flare have an average lifetime of 10.0 $\pm$ 5.5 minutes, an
average width of 1022 $\pm$ 339 km, and an average maximum length of 33 $\pm$
10 Mm, (2) blob-like falling features with a size close to the resolution of
SDO/AIA are identified in the DPFLs and they have an average velocity of 76
$\pm$ 19 km s$^{-1}$, and (3) the average widths of the DPFLs slightly increase
with the characteristic temperatures in AIA 304, 171, 193, and 211 {\AA}
channels. Our investigation shows that DPFLs are found in all of the 20 cases
within this study, which suggests that they are a common phenomenon in X-class
flares and are probably produced by the same mechanism that creates coronal
rain.


title:
Metallic ferromagnetism-insulating charge order transition in doped
  manganites

abstract:
  We show that an interplay of double exchange and impurity randomness can
explain the competition between metal-ferromagnetic and insulating charge
ordered states in doped manganites. The double exchange is simplified in the
Ising type, whereas the randomness is modeled by the Falicov-Kimball binary
distribution. The combined model is considered in a framework of dynamical
mean-field theory. Using the Kubo-Greenwood formalism, the transport
coefficients are explicitly expressed in terms of single particle spectral
functions. Dividing the system into two sublattices we have pointed out a
direct calculation to the checkerboard charge order parameter and the
magnetizations. Numerical results show us that the checkerboard charge order
can settle inside the ferromagnetic state at low temperature. An
insulator-metal transition is also found at the point of the checkerboard
charge order-ferromagnetic transition.


title: Piezoelectricity in planar boron nitride via a geometric phase

abstract:
  Due to their low surface mass density, two-dimensional materials with a
strong piezoelectric response are interesting for nanoelectromechanical systems
with high force sensitivity. Unlike graphene, the two sublattices in a
monolayer of hexagonal boron nitride (hBN) are occupied by different elements,
which breaks inversion symmetry and allows for piezoelectricity. This has been
confirmed with density functional theory calculations of the piezoelectric
constant of hBN. Here, we formulate an entirely analytical derivation of the
electronic contribution to the piezoelectric response in this system based on
the concepts of strain-induced pseudomagnetic vector potential and the modern
theory of polarization that relates the polar moment to the Berry curvature.
Our findings agree with the symmetry restrictions expected for the hBN lattice
and reproduce well the magnitude of the piezoelectric effect previously
obtained ab-initio.


title: Wild ramification determines the characteristic cycle

abstract:
  Constructible complexes have the same characteristic cycle if they have the
same wild ramification, even if the characteristics of the coefficients fields
are different.


title: Generators of Siegel modular function field of higher genus and level

abstract:
  For positive integers $g$ and $N$, let $\mathcal{F}_N$ be the field of
meromorphic Siegel modular functions of genus $g$ and level $N$ whose Fourier
coefficients belong to the $N$th cyclotomic field. We present explicit
generators of $\mathcal{F}_N$ over $\mathcal{F}_1$ in terms of quotient of
theta constants, when $g\geq2$ and $N\geq 3$.


title: Comments on: "A Random Forest Guided Tour" by G. Biau and E. Scornet

abstract:
  This paper is a comment on the survey paper by Biau and Scornet (2016) about
random forests. We focus on the problem of quantifying the impact of each
ingredient of random forests on their performance. We show that such a
quantification is possible for a simple pure forest , leading to conclusions
that could apply more generally. Then, we consider "hold-out" random forests,
which are a good middle point between "toy" pure forests and Breiman's original
random forests.


title:
Towards achieving strong coupling in 3D-cavity with solid state spin
  resonance

abstract:
  We investigate the microwave magnetic field confinement in several microwave
3D-cavities, using 3D finite-element analysis to determine the best design and
achieve strong coupling between microwave resonant cavity photons and solid
state spins. Specifically, we design cavities for achieving strong coupling of
electromagnetic modes with an ensemble of nitrogen vacancy (NV) defects in
diamond. We report here a novel and practical cavity design with a magnetic
filling factor of up to 4 times (2 times higher collective coupling) than
previously achieved using 1D superconducting cavities with small mode volume.
In addition, we show that by using a double-split resonator cavity, it is
possible to achieve up to 200 times better cooperative factor than the
currently demonstrated with NV in diamond. These designs open up further
opportunities for studying strong and ultra-strong coupling effects on spins in
solids using alternative systems with a wider range of design parameters.


title: Cotorsion pairs in categories of quiver representations

abstract:
  We study the category $\mathrm{Rep}(Q,\mathcal{M})$ of representations of a
quiver $Q$ with values in an abelian category $\mathcal{M}$. Under certain
assumptions, we show that every cotorsion pair $(\mathcal{A},\mathcal{B})$ in
$\mathcal{M}$ induces two (explicitly described) cotorsion pairs
$(\Phi(\mathcal{A}),\mathrm{Rep}(Q,\mathcal{B}))$ and
$(\mathrm{Rep}(Q,\mathcal{A}),\Psi(\mathcal{B}))$ in
$\mathrm{Rep}(Q,\mathcal{M})$. This is akin to a result by Gillespie, which
asserts that a cotorsion pair $(\mathcal{A},\mathcal{B})$ in $\mathcal{M}$
induces cotorsion pairs $(\widetilde{\mathcal{A}},
\mathrm{dg}\,\widetilde{\mathcal{B}})$ and
$(\mathrm{dg}\,\widetilde{\mathcal{A}}, \widetilde{\mathcal{B}})$ in the
category $\mathrm{Ch}(\mathcal{M})$ of chain complexes in $\mathcal{M}$.
Special cases of our results recover descriptions of the projective and
injective objects in $\mathrm{Rep}(Q,\mathcal{M})$ proved by Enochs, Estrada,
and Garcia Rozas.


title: Simple and Efficient Learning using Privileged Information

abstract:
  The Support Vector Machine using Privileged Information (SVM+) has been
proposed to train a classifier to utilize the additional privileged information
that is only available in the training phase but not available in the test
phase. In this work, we propose an efficient solution for SVM+ by simply
utilizing the squared hinge loss instead of the hinge loss as in the existing
SVM+ formulation, which interestingly leads to a dual form with less variables
and in the same form with the dual of the standard SVM. The proposed algorithm
is utilized to leverage the additional web knowledge that is only available
during training for the image categorization tasks. The extensive experimental
results on both Caltech101 andWebQueries datasets show that our proposed method
can achieve a factor of up to hundred times speedup with the comparable
accuracy when compared with the existing SVM+ method.


title:
Energy Harvesting-Aided Spectrum Sensing and Data Transmission in
  Heterogeneous Cognitive Radio Sensor Network

abstract:
  The incorporation of Cognitive Radio (CR) and Energy Harvesting (EH)
capabilities in wireless sensor networks enables spectrum and energy efficient
heterogeneous cognitive radio sensor networks (HCRSNs). The new networking
paradigm of HCRSNs consists of EH-enabled spectrum sensors and battery powered
data sensors. Spectrum sensors can cooperatively scan the licensed spectrum for
available channels, while data sensors monitor an area of interest and transmit
sensed data to the sink over those channels. In this work, we propose a
resource allocation solution for the HCRSN to achieve the sustainability of
spectrum sensors and conserve energy of data sensors. The proposed solution is
achieved by two algorithms that operate in tandem, a spectrum sensor scheduling
algorithm and a data sensor resource allocation algorithm. The spectrum sensor
scheduling algorithm allocates channels to spectrum sensors such that the
average detected available time for the channels is maximized, while the EH
dynamics are considered and PU transmissions are protected. The data sensor
resource allocation algorithm allocates the transmission time, power and
channels such that the energy consumption of the data sensors is minimized.
Extensive simulation results demonstrate that the energy consumption of the
data sensors can be significantly reduced while maintaining the sustainability
of the spectrum sensors.


title: Spin filter for arbitrary spins by substrate engineering

abstract:
  We design spin filters for particles with potentially arbitrary spin S (=
1/2, 1, 3/2,....) using a one-dimensional periodic chain of magnetic atoms as a
quantum device. Describing the system within a tight-binding formalism we
present an analytical method to unravel the analogy between a one-dimensional
magnetic chain and a multi-strand ladder network. This analogy is crucial, and
is subsequently exploited to engineer gaps in the energy spectrum by an
appropriate choice of the magnetic substrate. We obtain an exact correlation
between the magnitude of the spin of the incoming beam of particles and the
magnetic moment of the substrate atoms in the chain desired for opening up of a
spectral gap. Results of spin polarized transport, calculated within a transfer
matrix formalism, are presented for particles having half-integer as well as
higher spin states. We find that the chain can be made to act as a quantum
device which opens a transmission window only for selected spin components over
certain ranges of the Fermi energy, blocking them in the remaining part of the
spectrum. The results appear to be robust even when the choice of the substrate
atoms deviates substantially from the ideal situation, as verified by extending
the ideas to the case of a spin spiral. Interestingly, the spin spiral
geometry, apart from exhibiting the filtering effect, is also seen to act as a
device flipping spins - an effect that can be monitored by an interplay of the
system size and the period of the spiral. Our scheme is applicable to ultracold
quantum gases, and might inspire future experiments in this direction.


title:
High-resolution, high-sensitivity, ground-based solar spectropolarimetry
  with a new fast imaging polarimeter

abstract:
  Context. Remote sensing of weak and small-scale solar magnetic fields is of
utmost relevance for a number of important open questions in solar physics.
This requires the acquisition of spectropolarimetric data with high spatial
resolution (0.1 arcsec) and low noise (1e-3 to 1e-5 of the continuum
intensity). The main limitations to obtain these measurements from the ground,
are the degradation of the image resolution produced by atmospheric seeing and
the seeing-induced crosstalk (SIC). Aims. We introduce the prototype of the
Fast Solar Polarimeter (FSP), a new ground-based, high-cadence polarimeter that
tackles the above-mentioned limitations by producing data that are optimally
suited for the application of post-facto image restoration, and by operating at
a modulation frequency of 100 Hz to reduce SIC. Results. The pnCCD camera
reaches 400 fps while keeping a high duty cycle (98.6 %) and very low noise
(4.94 erms). The modulator is optimized to have high (> 80%) total polarimetric
efficiency in the visible spectral range. This allows FSP to acquire 100
photon-noise-limited, full-Stokes measurements per second. We found that the
seeing induced signals present in narrow-band, non-modulated, quiet-sun
measurements are (a) lower than the noise (7e-5) after integrating 7.66 min,
(b) lower than the noise (2.3e-4) after integrating 1.16 min and (c) slightly
above the noise (4e-3) after restoring case (b) by means of a multi-object
multi-frame blind deconvolution. In addition, we demonstrate that by using only
narrow-band images (with low SNR of 13.9) of an active region, we can obtain
one complete set of high-quality restored measurements about every 2 s.


title: Linear Weingraten factorable surfaces in isotropic spaces

abstract:
  In this paper, we deal with the linear Weingarten factorable surfaces in the
isotropic 3-space I^{3} satisfying the relation aK+bH=c, where K is the
relative curvature and H the isotropic mean curvature, a,b,cR. We obtain a
complete classification for such surfaces in I^{3}. As a further study, we
classify all graph surfaces in I^{3} satisfying the relation K=H^{2}, which is
the equality case of the famous Euler inequality for surfaces in a Euclidean
space.


title:
Physical conditions in three high-z H2-bearing DLAs: implications for
  grain size

abstract:
  We present results of our numerical simulation of three H2-bearing damped
Lyman alpha absorbers (DLAs) in the redshift interval ~ 2-3. The systems we
have modelled are the DLAs at zabs = 2.3377 towards the quasar LBQS 1232+0815,
at zabs = 2.41837 towards SDSS J143912.04+111740.5 and at zabs = 2.6265 towards
FBQS J081240.6+320808. We have used the spectral synthesis code CLOUDY to
simulate the physical environment of these DLAs, and constrain the density,
radiation field, geometry and dust-grain properties of the DLAs
self-consistently based on the observed column densities of various atomic and
molecular species such as H I, fine structure lines of C I and the rotational
level population of H2. In our models, we explore the effect of grain size
distribution on the predicted column densities of different species. Within the
allowed uncertainties in the inferred dust-to-gas ratio, both models with
standard ISM grains and smaller-sized grains reproduce the observations equally
well. Improved constraints on dust-to-gas ratio and line-of-sight extinction
are important for probing the grain size distribution in high-z DLAs. We find
the H2-bearing clouds to have line-of-sight thickness in the range 1-6 pc,
consistent with what has been found using partial coverage or 21-cm
observations in some high-z DLAs.


title:
Poincar\'e trace inequalities in $BV(\mathbb B^n)$ with nonstandard
  normalization

abstract:
  Extremal functions are exhibited in Poincar\'e trace inequalities for
functions of bounded variation in the unit ball ${\mathbb B}^n$ of the
$n$-dimensional Euclidean space ${\mathbb R}^n$. Trial functions are subject to
either a vanishing mean value condition, or a vanishing median condition in the
whole of ${\mathbb B}^n$, instead of just on $\partial {\mathbb B}^n$, as
customary. The extremals in question take a different form, depending on the
constraint imposed. In particular, under the latter constraint, unusually
shaped extremal functions appear. A key step in our approach is a
characterization of the sharp constant in the relevant trace inequalities in
any admissible domain $\Omega \subset {\mathbb R}^n$, in terms of an
isoperimetric inequality for subsets of $\Omega$.


title:
Model-independent measurement of the CKM angle $\gamma$ using $B^0 \to D
  K^{\ast 0}$ decays with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ and $K_{S}^{0}
  K^{+} K^{-}$

abstract:
  A binned Dalitz plot analysis of the decays $B^0 \to D K^{\ast 0}$, with $D
\to K_{S}^{0} \pi^{+} \pi^{-}$ and $K_{S}^{0} K^{+} K^{-}$, is performed to
measure the observables $x_\pm$ and $y_\pm$, which are related to the CKM angle
$\gamma$ and the hadronic parameters of the decays. The $D$ decay strong phase
variation over the Dalitz plot is taken from measurements performed at the
CLEO-c experiment, making the analysis independent of the $D$ decay model. With
a sample of proton-proton collision data, corresponding to an integrated
luminosity of $3.0\,\rm{fb}^{-1}$, collected by the LHCb experiment, the values
of the $CP$ violation parameters are found to be $x_+ = 0.05 \pm 0.35 \pm
0.02$, $x_-=-0.31\pm 0.20 \pm 0.04$, $y_+=-0.81\pm 0.28\pm 0.06$ and
$y_-=0.31\pm 0.21 \pm 0.05$, where the first uncertainties are statistical and
the second systematic. These observables correspond to values $\gamma$ = $(71
\pm 20)^\circ$, $r_{B^0} = 0.56\pm 0.17$ and $\delta_{B^0} =
(204\,^{+21}_{-20})^\circ$. The parameters $r_{B^0}$ and $\delta_{B^0}$ are the
magnitude ratio and strong phase difference between the suppressed and favoured
$B^0$ decay amplitudes, and have been measured in a region of $\pm 50$
MeV/$c^2$ around the $K^{\ast}(892)^{0}$ mass and with the magnitude of the
cosine of the $K^{\ast}(892)^{0}$ helicity angle larger than 0.4.


title:
Deriving the extinction to young stellar objects using [FeII]
  near-infrared emission lines. Prescriptions from GIANO high-resolution
  spectra

abstract:
  The near-infrared emission lines of Fe$^{+}$ at 1.257, 1.321, and 1.644
$\mu$m share the same upper level; their ratios can then be exploited to derive
the extinction to a line emitting region once the relevant spontaneous emission
coefficients are known. This is commonly done, normally from low-resolution
spectra, in observations of shocked gas from jets driven by Young Stellar
Objects. In this paper we review this method, provide the relevant equations,
and test it by analyzing high-resolution ($R \sim 50000$) near-infrared spectra
oftwo young stars, namely the Herbig Be star HD 200775 and the Be star V1478
Cyg, which exhibit intense emission lines. The spectra were obtained with the
new GIANO echelle spectrograph at the Telescopio Nazionale Galileo. Notably,
the high-resolution spectra allowed checking the effects of overlapping
telluric absorption lines. A set of various determinations of the Einstein
coefficients are compared to show how much the available computations affect
extinction derivation. The most recently obtained values are probably good
enough to allow reddening determination within 1 visual mag of accuracy.
Furthermore, we show that [FeII] line ratios from low-resolution pure
emission-line spectra in general are likely to be in error due to the
impossibility to properly account for telluric absorption lines. If
low-resolution spectra are used for reddening determinations, we advice that
the ratio 1.644/1.257, rather than 1.644/1.321, should be used, being less
affected by the effects of telluric absorption lines.


title: Quasi-elastic scattering of 6He, 7Be, and 8B nuclei by 12C nuclei

abstract:
  The observed cross sections of quasi-elastic scattering of 6He, 7Be, and 8B
nuclei by 12C nuclei are described within the framework of the diffraction
nuclear model and the model of nucleus-nucleus scattering in the high-energy
approximation with a double folding potential, for intermediate energies of the
incident particles. The calculations make use of realistic distributions of
nucleon densities and take account of the Coulomb interaction and inelastic
scattering with excitation of low-lying collective states of the target.


title: Optomechanical THz detection with a sub-wavelength resonator

abstract:
  The terahertz (THz) spectral domain offers a myriad of applications spanning
chemical spectroscopy, medicine, security and imaging[1]. It has also recently
become a playground for fundamental studies of light-matter interactions [2-6].
THz science and technology could benefit from optomechanical approaches, which
harness the interaction of light with miniature mechanical resonators [7,8]. So
far, optomechanics has mostly focused on the optical and microwave domains,
leading to new types of quantum experiments [9-11] and to the development of
optical-microwave converters [12-14]. Here we demonstrate an integrated
meta-atom [15] THz resonator with a flexible part acting as a mechanical
oscillator. In this device free space THz photons are collected by the
resonator and induce high frequency currents and charges that, in turn, couple
to the mechanical degrees of freedom. The resulting mechanical motion is
read-out optically, allowing our device to function as a compact and efficient
terahertz detector at room temperature. Furthermore the device operates at high
modulation frequencies (>10MHz), well beyond the cut-off frequencies of Golay
cells, pyroelectric detectors and cryogenic semiconductor bolometers [16,17].
Notably, our experiments unambiguously reveal an instantaneous THz detection
mechanism arising from a nano-scale Coulomb interaction, with a Noise
Equivalent Power that is potentially frequency independent. Alongside this
effect, our compact geometry allows for an uncooled bolometric detection [18]
with extremely short heat diffusion times (few microseconds) and high
detectivity.


title: Axiomatic Characterization of Committee Scoring Rules

abstract:
  Committee scoring rules form a rich class of aggregators of voters'
preferences for the purpose of selecting subsets of objects with desired
properties, e.g., a shortlist of candidates for an interview, a representative
collective body such as a parliament, or a set of locations for a set of public
facilities. In the spirit of celebrated Young's characterization result that
axiomatizes single-winner scoring rules, we provide an axiomatic
characterization of multiwinner committee scoring rules. We show that committee
scoring rules---despite forming a remarkably general class of rules---are
characterized by the set of four standard axioms, anonymity, neutrality,
consistency and continuity, and by one axiom specific to multiwinner rules
which we call committee dominance. In the course of our proof, we develop
several new notions and techniques. In particular, we introduce and
axiomatically characterize multiwinner decision scoring rules, a class of rules
that broadly generalizes the well-known majority relation.


title: On the origin of 140 GHz emission from the 4 July 2012 solar flare

abstract:
  The sub-THz event observed on the 4 July 2012 with the Bauman Moscow State
Technical University Radio Telescope RT-7.5 at 93 and 140~GHz as well as
Kislovodsk and Mets\"ahovi radio telescopes, Radio Solar Telescope Network
(RSTN), GOES, RHESSI, and SDO orbital stations is analyzed. The spectral flux
between 93 and 140 GHz has been observed increasing with frequency. On the
basis of the SDO/AIA data the differential emission measure has been
calculated. It is shown that the thermal coronal plasma with the temperature
above 0.5~MK cannot be responsible for the observed sub-THz flare emission. The
non-thermal gyrosynchrotron mechanism can be responsible for the microwave
emission near $10$~GHz but the observed millimeter spectral characteristics are
likely to be produced by the thermal bremsstrahlung emission from plasma with a
temperature of about 0.1~MK.


title: Trilinear gauge boson couplings in the gauge-Higgs unification

abstract:
  We examine trilinear gauge boson couplings (TGCs) in the context of the
$SU(3)_W\otimes U(1)'$ gauge-Higgs unification scenario. The TGCs play
important roles in the probes of the physics beyond the standard model, since
they are highly restricted by the experiments. We discuss mass spectrum of the
neutral gauge boson with brane-localized mass terms carefully and find that the
TGCs and $\rho$ parameter may deviate from standard model predictions. Finally
we put a constraint from these observables and discuss the possible parameter
space.


title: Light-hole exciton mixing and dynamics in Mn-doped quantum dots

abstract:
  We investigate theoretically the spectral and dynamical effects of the
short-range exchange interaction between a single manganese (Mn) atom hosted by
cylindrical CdTe quantum dots and its light-hole excitons or biexcitons. Our
approach is based on the Kohn-Luttinger KP theory and configuration interaction
method, the dynamics of the system in the presence of intraband relaxation
being derived from the von Neumann-Lindblad equation. The complex structure of
the light-hole exciton absorption spectrum reveals the exchange-induced exciton
mixing and depends strongly on the Mn position. In particular, if the Mn atom
is closer to the edges of the cylinder the bright and dark light-hole excitons
are mixed by the hole-Mn exchange alone. Consequently, their populations
exhibit exchange-induced Rabi oscillations which can be viewed as optical
signatures of light-hole spin reversal. Similar results are obtained for mixed
biexcitons, in this case the exchange-induced Rabi oscillations being damped by
the intraband hole relaxation processes. The effect of light-hole heavy-hole
mixing is also discussed.


title:
Characterisation of the turbulent electromotive force and its
  magnetically-mediated quenching in a global EULAG-MHD simulation of solar
  convection

abstract:
  We perform a mean-field analysis of the EULAG-MHD millenium simulation of
global magnetohydrodynamical convection presented in Passos et al. 2014. The
turbulent electromotive force operating in the simulation is assumed to be
linearly related to the cyclic axisymmetric mean magnetic field and its first
spatial derivatives. At every grid point in the simulation's meridional plane,
this assumed relationship involves 27 independent tensorial coefficients.
Expanding on Racine et al. 2011, we extract these coefficients from the
simulation data through a least-squares minimization procedure based on
singular value decomposition. The reconstructed alpha-tensor shows good
agreement with that obtained by Racine et al. 2011, who did not include
derivatives of the mean-field in their fit, as well as with the alpha-tensor
extracted by Augustson et al. 2015 from a distinct ASH MHD simulation. The
isotropic part of the turbulent magnetic diffusivity tensor beta is positive
definite and reaches values of 5.0x10^7 m2s-1 in the middle of the convecting
fluid layers. The spatial variations of both alpha_phiphi and beta_phiphi
component are well reproduced by expressions obtained under the SOCA, with a
good matching of amplitude requiring a turbulent correlation time about five
times smaller than the estimated turnover time of the small-scale turbulent
flow. We find the magnetic quenching of the alpha-effect to be driven primarily
by a reduction of the small-scale flow's kinetic helicity, with variations of
the current helicity playing a lesser role in most locations in the simulation
domain. Our measurements of turbulent diffusivity quenching are restricted to
the beta_phiphi component, but indicate a weaker quenching, by a factor of
1.36, than of the alpha effect, which in our simulation drops by a factor of
three between the minimum and maximum phases of the magnetic cycle.


title: Why Granular Media Are Thermal, and Quite Normal, After All

abstract:
  Two approaches exist to account for granular dynamics: The athermal one takes
grains as elementary, the thermal one considers the total entropy that includes
microscopic degrees of freedom such as phonons and electrons. Discrete element
method (DEM), granular kinetic theory and athermal statistical mechanics (ASM)
belong to the first, granular solid hydrodynamics (GSH) to the second one. A
discussion of the conceptual differences between both is given here, leading,
among others, to the following insights: (1) While DEM and granular kinetic
theory are well justified to take grains as athermal, any entropic
consideration is far less likely to succeed. (2) In addition to modeling grains
as a gas of dissipative, rigid mass points, it is very helpful take grains as a
thermal solid that has been sliced and diced. (3) General principles that
appear invalid in granular media are repaired and restored once the true
entropy is included. These abnormalities [such as invalidity of the
fluctuation-dissipation theorem, granular temperatures failing to equilibrate,
and grains at rest unable to explore the phase space] are consequences of the
athermal approximation, not properties of granular media.


title: Zero Temperature Holographic Superfluids with Two Competing Orders

abstract:
  We initiate the investigation of the zero temperature holographic superfluids
with two competing orders, where besides the vacuum phase, two one band
superfluid phases, the coexistent superfluid phase has also been found in the
AdS soliton background for the first time. We construct the complete phase
diagram in the $e-\mu$ plane by numerics, which is consistent with our
qualitative analysis. Furthermore, we calculate the corresponding optical
conductivity and sound speed by the linear response theory. The onset of pole
of optical conductivity at $\omega=0$ indicates that the spontaneous breaking
phase always represents the superfluid phase, and the residue of pole is
increased with the chemical potential, which is consistent with the fact that
the particle density is essentially the superfluid density for zero temperature
superfluids. In addition, the resulting sound speed demonstrates the
non-smoothness at the critical points as the order parameter of condensate,
which indicates that the phase transitions can also be identified by the
behavior of sound speed. Moreover, as expected from the boundary conformal
field theory, the sound speed saturates to $\frac{1}{\sqrt{2}}$ at the large
chemical potential limit for our two band holographic superfluid model.


title:
The X-ray light curve of the massive colliding wind Wolf-Rayet + O
  binary WR21a

abstract:
  Our dedicated XMM-Newton monitoring, as well as archival Chandra and Swift
datasets, were used to examine the behaviour of the WN5h+O3V binary WR21a at
high energies. For most of the orbit, the X-ray emission exhibits few
variations. However, an increase in strength of the emission is seen before
periastron, following a 1/D relative trend, where D is the separation between
both components. This increase is rapidly followed by a decline due to strong
absorption as the Wolf-Rayet (WR) comes in front. The fitted local absorption
value appears to be coherent with a mass-loss rate of about 1x10^{-5} M_sol/yr
for the WR component. However, absorption is not the only parameter affecting
the X-ray emission at periastron as even the hard X-ray emission decreases,
suggesting a possible collapse of the colliding wind region near to or onto the
photosphere of the companion just before or at periastron. An eclipse may
appear as another potential scenario, but it would be in apparent contradiction
with several lines of evidence, notably the width of the dip in the X-ray light
curve and the absence of variations in the UV light curve. Afterwards, the
emission slowly recovers, with a strong hysteresis effect. The observed
behaviour is compatible with predictions from general wind-wind collision
models although the absorption increase is too shallow.


title: Generating Chinese Classical Poems with RNN Encoder-Decoder

abstract:
  We take the generation of Chinese classical poem lines as a
sequence-to-sequence learning problem, and build a novel system based on the
RNN Encoder-Decoder structure to generate quatrains (Jueju in Chinese), with a
topic word as input. Our system can jointly learn semantic meaning within a
single line, semantic relevance among lines in a poem, and the use of
structural, rhythmical and tonal patterns, without utilizing any constraint
templates. Experimental results show that our system outperforms other
competitive systems. We also find that the attention mechanism can capture the
word associations in Chinese classical poetry and inverting target lines in
training can improve performance.


title:
The boundedness of certain sublinear operators with rough kernel
  generated by Calder\'on-Zygmund operators and their commutators on
  generalized weighted Morrey spaces

abstract:
  The aim of this paper is to get the boundedness of certain sublinear
operators with rough kernel generated by Calder\'on-Zygmund operators on the
generalized weighted Morrey spaces under generic size conditions which are
satisfied by most of the operators in harmonic analysis. We also prove that the
commutator operators formed by BMO functions and certain sublinear operators
with rough kernel are also bounded on the generalized weighted Morrey spaces.
Marcinkiewicz operator which satisfies the conditions of these theorems can be
considered as an example.


title: Periodically modulated electromagnetically induced transparency

abstract:
  Phenomena of electromagnetically induced transparency (PEIT) may be
interpreted by the Autler-Townes Splitting (ATS), where the coupled states are
split by the coupling laser field, or by the quantum destructive interference
(QDI), where the atomic phases caused by the coupling laser and the probe laser
field cancel. We propose modulated experiments to explore the PEIT in an
alternative way by periodically modulating the coupling and the probe fields in
a ?-type three-level system. Our analytical and numerical results rule out the
ATS interpretation and show that the QDI interpretation is more appropriate for
the modulated experiments. The proposed experiments are readily implemented in
atomic gases, artificial atoms in superconducting quantum devices, or
three-level meta-atoms in meta-materials.


title: Choice of Paper for Multigraphene Growth on Lead Pencil Drawing

abstract:
  Graphene is prepared with a variety of methods, such as thermal decomposition
of SiC, Chemical Vapor Deposition and pulsed laser deposition. We propose
another method to prepare graphitic carbon by irradiating lead pencil drawn
paper using femtosecond laser [Jpn. J. Appl. Phys. 55 (2016) 01AE24]. In order
to evaluate electronic properties, such as resistivity and mobility, surface
roughness of paper is important to evaluate thickness of lead pencil as one of
principal factors. The surface roughness of variety of paper was investigated
including cross section of drawing paper. Femotosecond laser irradiated the
sample surface with its focus shifted from the optical focal point to enlarge
the laser spot and tender irradiation.


title: An Alternative Discrete Skew Logistic Distribution

abstract:
  In this paper, an alternative Discrete skew Logistic distribution is
proposed, which is derived by using the general approach of discretizing a
continuous distribution while retaining its survival function. The properties
of the distribution are explored and it is compared to a discrete distribution
defined on integers recently proposed in the literature. The estimation of its
parameters are discussed, with particular focus on the maximum likelihood
method and the method of proportion, which is particularly suitable for such a
discrete model. A Monte Carlo simulation study is carried out to assess the
statistical properties of these inferential techniques. Application of the
proposed model to a real life data is given as well.


title: A biobjective approach to robustness based on location planning

abstract:
  Finding robust solutions of an optimization problem is an important issue in
practice, and various concepts on how to define the robustness of a solution
have been suggested. The idea of recoverable robustness requires that a
solution can be recovered to a feasible one as soon as the realized scenario
becomes known. The usual approach in the literature is to minimize the
objective function value of the recovered solution in the nominal or in the
worst case.
  As the recovery itself is also costly, there is a trade-off between the
recovery costs and the solution value obtained; we study both, the recovery
costs and the solution value in the worst case in a biobjective setting.
  To this end, we assume that the recovery costs can be described by a metric.
We demonstrate that this leads to a location planning problem, bringing
together two fields of research which have been considered separate so far.
  We show how weakly Pareto efficient solutions to this biobjective problem can
be computed by minimizing the recovery costs for a fixed worst-case objective
function value and present approaches for the case of linear and quasiconvex
problems for finite uncertainty sets. We furthermore derive cases in which the
size of the uncertainty set can be reduced without changing the set of Pareto
efficient solutions.


title:
The Barcelona-Catania-Paris-Madrid functional with a realistic effective
  mass

abstract:
  The Barcelona-Catania-Paris-Madrid (BCPM) functional recently proposed to
describe nuclear structure properties of finite nuclei is generalized as to
include a realistic effective mass. The resulting functional is as good as the
previous one in describing binding energies, radii, deformation properties, etc
and, in addition, the description of Giant Quadrupole Resonance energies is
greatly improved.


title:
Day of the week effect in paper submission/acceptance/rejection to/in/by
  peer review journals

abstract:
  This paper aims at providing an introduction to the behavior of authors
submitting a paper to a scientific journal. Dates of electronic submission of
papers to the Journal of the Serbian Chemical Society have been recorded from
the 1st January 2013 till the 31st December 2014, thus over 2 years.
  There is no Monday or Friday effect like in financial markets, but rather a
Tuesday-Wednesday effect occurs: papers are more often submitted on Wednesday;
however, the relative number of going to be accepted papers is larger if these
are submitted on Tuesday. On the other hand, weekend days (Saturday and Sunday)
are not the best days to finalize and submit manuscripts. An interpretation
based on the type of submitted work ("experimental chemistry") and on the
influence of (senior) coauthors is presented. A thermodynamic connection is
proposed within an entropy context. A (new) entropic distance is defined in
order to measure the "opaqueness" = disorder) of the submission process.


title:
Training Constrained Deconvolutional Networks for Road Scene Semantic
  Segmentation

abstract:
  In this work we investigate the problem of road scene semantic segmentation
using Deconvolutional Networks (DNs). Several constraints limit the practical
performance of DNs in this context: firstly, the paucity of existing pixel-wise
labelled training data, and secondly, the memory constraints of embedded
hardware, which rule out the practical use of state-of-the-art DN architectures
such as fully convolutional networks (FCN). To address the first constraint, we
introduce a Multi-Domain Road Scene Semantic Segmentation (MDRS3) dataset,
aggregating data from six existing densely and sparsely labelled datasets for
training our models, and two existing, separate datasets for testing their
generalisation performance. We show that, while MDRS3 offers a greater volume
and variety of data, end-to-end training of a memory efficient DN does not
yield satisfactory performance. We propose a new training strategy to overcome
this, based on (i) the creation of a best-possible source network (S-Net) from
the aggregated data, ignoring time and memory constraints; and (ii) the
transfer of knowledge from S-Net to the memory-efficient target network
(T-Net). We evaluate different techniques for S-Net creation and T-Net
transferral, and demonstrate that training a constrained deconvolutional
network in this manner can unlock better performance than existing training
approaches. Specifically, we show that a target network can be trained to
achieve improved accuracy versus an FCN despite using less than 1\% of the
memory. We believe that our approach can be useful beyond automotive scenarios
where labelled data is similarly scarce or fragmented and where practical
constraints exist on the desired model size. We make available our network
models and aggregated multi-domain dataset for reproducibility.


title:
Numerical simulations of Kelvin-Helmholtz instability: a two-dimensional
  parametric study

abstract:
  Using two-dimensional simulations, we numerically explore the dependences of
Kelvin-Helmholtz instability upon various physical parameters, including
viscosity, width of sheared layer, flow speed, and magnetic field strength. In
most cases, a multi-vortex phase exists between the initial growth phase and
final single-vortex phase. The parametric study shows that the evolutionary
properties, such as phase duration and vortex dynamics, are generally sensitive
to these parameters except in certain regimes. An interesting result is that
for supersonic flows, the phase durations and saturation of velocity growth
approach constant values asymptotically as the sonic Mach number increases. We
confirm that the linear coupling between magnetic field and Kelvin-Helmholtz
modes is negligible if the magnetic field is weak enough. The morphological
behaviour suggests that the multi-vortex coalescence might be driven by the
underlying wave-wave interaction. Based on these results, we make a preliminary
discussion about several events observed in the solar corona. The numerical
models need to be further improved to make a practical diagnostic of the
coronal plasma properties.


title:
From the Vlasov-Maxwell-Boltzmann system to incompressible viscous
  electro-magneto-hydrodynamics

abstract:
  We treat hydrodynamic limits of the Vlasov-Maxwell-Boltzmann system for one
and two species of particles in a viscous incompressible regime.


title: Superconductivity in two-dimensional disordered Dirac semimetals

abstract:
  In two-dimensional Dirac semimetals, Cooper pairing instability occurs only
when the attractive interaction strength $|u|$ is larger than some critical
value $|u_{c}|$ because the density of states vanishes at Dirac points.
Disorders enhance the low-energy density of states but meanwhile shorten the
lifetime of fermions, which tend to promote and suppress superconductivity,
respectively. To determine which of the two competing effects wins, we study
the interplay of Cooper pairing interaction and disorder scattering by means of
renormalization group method. We consider three types of disorders, including
random mass, random gauge potential, and random chemical potential, and show
that the first two suppress superconductivity. In particular, the critical BCS
coupling $|u_{c}|$ is increased to certain larger value if the system contains
only random mass or random gauge potential, which makes the onset of
superconductivity more difficult. In the case of random chemical potential, the
effective disorder parameter flows to the strong coupling regime, where the
perturbation expansion breaks down and cannot provide a clear answer concerning
the fate of superconductivity. When different types of disorder coexist in one
system, their strength parameters all flow to strong couplings. In the strong
coupling regime, the perturbative renormalization group method becomes invalid,
and one needs to employ other methods to treat the disorder effects. We perform
a simple gap equation analysis of the impact of random chemical potential on
superconductivity by using the Abrikosov-Gorkov diagrammatic approach, and also
briefly discuss the possible generalization of this approach.


abstract:
  In this paper, we are concerned with Gorenstein projective objects in
homotopy categories. Specifically, we present a characterization on Gorenstein
projective objects in the category of complexes. Using this result, it is
proved that the category of Gorenstein projective objects is a compactly
generated triangulated category and an equivalence of triangulated categories
is also given over some reasonably nice rings.


title: A Multivariate Approach for Checking Resiliency in Access Control

abstract:
  In recent years, several combinatorial problems were introduced in the area
of access control. Typically, such problems deal with an authorization policy,
seen as a relation $UR \subseteq U \times R$, where $(u, r) \in UR$ means that
user $u$ is authorized to access resource $r$. Li, Tripunitara and Wang (2009)
introduced the Resiliency Checking Problem (RCP), in which we are given an
authorization policy, a subset of resources $P \subseteq R$, as well as
integers $s \ge 0$, $d \ge 1$ and $t \geq 1$. It asks whether upon removal of
any set of at most $s$ users, there still exist $d$ pairwise disjoint sets of
at most $t$ users such that each set has collectively access to all resources
in $P$. This problem possesses several parameters which appear to take small
values in practice. We thus analyze the parameterized complexity of RCP with
respect to these parameters, by considering all possible combinations of $|P|,
s, d, t$. In all but one case, we are able to settle whether the problem is in
FPT, XP, W[2]-hard, para-NP-hard or para-coNP-hard. We also consider the
restricted case where $s=0$ for which we determine the complexity for all
possible combinations of the parameters.


title: Stably co-tame polynomial automorphisms over commutative rings

abstract:
  We say that a polynomial automorphism $\phi $ in $n$ variables is stably
co-tame if the tame subgroup in $n$ variables is contained in the subgroup
generated by $\phi $ and affine automorphisms in $n+1$ variables. In this
paper, we give conditions for stably co-tameness of polynomial automorphisms.


title:
Polarized thermal emission from X-ray Dim Isolated Neutron Stars: the
  case of RX J1856.5-3754

abstract:
  The observed polarization properties of thermal radiation from isolated,
cooling neutron stars depend on both the emission processes at the surface and
the effects of the magnetized vacuum which surrounds the star. Here we
investigate the polarized thermal emission from X-ray Dim Isolated Neutron
Stars, taking RX J1856.5-3754 as a representative case. The physical conditions
of the star outermost layers in these sources is still debated, and so we
consider emission from a magnetized atmosphere and a condensed surface,
accounting for the effects of vacuum polarization as the radiation propagates
in the star magnetosphere. We have found that, for a significant range of
viewing geometries, measurement of the phase-averaged polarization fraction and
phase-averaged polarization angle at both optical and X-ray wavelengths allow
us to determine whether this neutron star has an atmosphere or a condensed
surface. Our results may therefore be relevant in view of future developments
of soft X-ray polarimeters.


title:
Role of $Y(4630)$ in the $p\bar{p}\rightarrow\Lambda_c\bar{\Lambda}_c$
  reaction near threshold

abstract:
  We investigate the charmed baryon production reaction
$p\bar{p}\rightarrow\Lambda_c\bar{\Lambda}_c$ in an effective Lagrangian
approach. Besides the $t$-channel $D^0$ and $D^{*0}$ mesons exchanges, the
$s$-channel $Y(4630)$ meson exchange is taken into account. For the total cross
sections, the $D^0$ and $D^{*0}$ mesons provide minor background contributions,
while the $Y(4630)$ state gives a clear peak structure with the magnitude of 10
$\mu$b at center of mass energy 4.63 GeV. Basing on the results, we suggest
that the reaction of $p\bar{p}\rightarrow\Lambda_c\bar{\Lambda}_c$ can be used
to search for the $1^{--}$ charmonium-like $Y(4630)$ state, and our predictions
can be tested in future by the $\rm{\bar PANDA}$ facility.


title:
Decaying shock studies of phase transitions in MgOSiO2 systems:
  implications for the Super-Earths interiors

abstract:
  We report an experimental study of the phase diagrams of periclase (MgO),
enstatite (MgSiO3) and forsterite (Mg2SiO4) at high pressures. We investigated
with laser driven decaying shocks the pressure/temperature curves of MgO,
MgSiO3 and Mg2SiO4 between 0.2-1.2 TPa, 0.12-0.5 TPa and 0.2-0.85 TPa
respectively. A melting signature has been observed in MgO at 0.47 TPa and 9860
K, while no phase changes were observed neither in MgSiO3 nor in Mg2SiO4. An
increasing of reflectivity of MgO, MgSiO3 and Mg2SiO4 liquids have been
detected at 0.55 TPa -12 760 K, 0.15 TPa - 7540 K, 0.2 TPa - 5800 K,
respectively. In contrast to SiO2, melting and metallization of these compounds
do not coincide implying the presence of poor electrically conducting liquids
close to the melting lines. This has important implications for the generation
of dynamos in Super-earths mantles.


title:
On the near-threshold incoherent $\phi$ photoproduction on the deuteron:
  any trace of a resonance?

abstract:
  We study the near-threshold incoherent $\phi$ photoproduction on the deuteron
based on a model of $\gamma N \to \phi N$, consisting of Pomeron, $(\pi, \eta)$
exchanges, and a $J^P = 3/2^-$ resonance, which describes the low energy
$\gamma p \to \phi p$ LEPS data well, including the peak in the forward
differential cross section.
  The calculation is done up to double rescatterings, with the spin dependence
of the elementary $\gamma N \to \phi N$ amplitude retained throughout the
calculation. The Fermi motion and final-state interactions (FSI) are all
properly treated as prescribed by realistic nucleon-nucleon interaction. The
couplings of the resonance to $\gamma n$ and $\phi n$ channels are estimated
with the help of a constituent quark model. The main features of the LEPS and
CLAS data are described reasonably well except for some quantitative
discrepancies at very low energies and low momentum transfers regions. It is
found that contributions of Fermi motion, $pn$ FSI, and resonance are all
indispensable in bridging the differences between the single-scattering results
and the data. The off-shell rescattering is found to be important as it cancels
out a large portion of the on-shell contribution. The discrepancies at low
momentum transfer region might be related to the binning size of the data. No
peak is found to be associated with the weak resonance as it gets smeared out
by the Fermi motion and FSI with deuterium target. The problem at very low
energy region hints at the possible contributions from other mechanisms and
should be investigated in depth with the use of recent high statistics $\gamma
p \to \phi p$ data from CLAS.


title: Domain Walls: Momentum Conservation in Absence of Asymptotic States

abstract:
  Gravitational potentials of the domain walls in the linearized gravity are
growing with distance, so the particle scattering by the wall can not be
described in terms of free asymptotic states. In the non-relativistic case this
problem is solved using the concept of the potential energy. We show that in
the relativistic case one is able to introduce gravitationally dressed momenta
the sum of which is conserved up to the momentum flux through the lateral
surface of the world tube describing losses due to excitation of the branon
waves.


title:
Market Imitation and Win-Stay Lose-Shift strategies emerge as unintended
  patterns in market direction guesses

abstract:
  Decisions taken in our everyday lives are based on a wide variety of
information so it is generally very difficult to assess what are the strategies
that guide us. Stock market therefore provides a rich environment to study how
people take decision since responding to market uncertainty needs a constant
update of these strategies. For this purpose, we run a lab-in-the-field
experiment where volunteers are given a controlled set of financial information
-based on real data from worldwide financial indices- and they are required to
guess whether the market price would go up or down in each situation. From the
data collected we explore basic statistical traits, behavioural biases and
emerging strategies. In particular, we detect unintended patterns of behavior
through consistent actions which can be interpreted as {\it Market Imitation}
and {\it Win-Stay Lose-Shift} emerging strategies, being {\it Market Imitation}
the most dominant one. We also observe that these strategies are affected by
external factors: the expert advice, the lack of information or an information
overload reinforce the use of these intuitive strategies, while the probability
to follow them significantly decreases when subjects spends more time to take a
decision. The cohort analysis shows that women and children are more prone to
use such strategies although their performance is not undermined. Our results
are of interest for better handling clients expectations of trading companies,
avoiding behavioural anomalies in financial analysts decisions and improving
not only the design of markets but also the trading digital interfaces where
information is set down. Strategies and behavioural biases observed can also be
translated into new agent based modelling or stochastic price dynamics to
better understand financial bubbles or the effects of asymmetric risk
perception to price drops.


title: A remark on configuration spaces of two points

abstract:
  We prove a homotopy invariance result for a certain covering space of the
space of ordered configurations of two points in $M \times X$ where $M$ is a
closed smooth manifold and $X$ is any fixed aspherical space which is not a
point.


title:
Strong spin-orbit fields and Dyakonov-Perel spin dephasing in supported
  metallic films

abstract:
  Spin dephasing by the Dyakonov-Perel mechanism in metallic films deposited on
insulating substrates is revealed, and quantitatively examined by means of
density functional calculations combined with a kinetic equation. The
surface-to-substrate asymmetry, probed by the metal wave functions in thin
films, is found to produce strong spin-orbit fields and a fast Larmor
precession, giving a dominant contribution to spin decay over the Elliott-Yafet
spin relaxation up to a thickness of 70 nm. The spin dephasing is oscillatory
in time with a rapid (sub-picosecond) initial decay. However, parts of the
Fermi surface act as spin traps, causing a persistent tail signal lasting 1000
times longer than the initial decay time. It is also found that the decay
depends on the direction of the initial spin polarization, resulting in a
spin-dephasing anisotropy of 200% in the examined cases.


title:
Non-deterministic branching programs with logarithmic repetition cannot
  efficiently compute small monotone CNFs

abstract:
  In this paper we establish an exponential lower bound on the size of
syntactic non-deterministic read $d$-times branching programs for $d \leq \log
n /10^5$ computing a class of monotone CNFs with a linear number of clauses.
This result provides the first separation of classes NP and co-NP for syntactic
branching programs with a logarithmic repetition and the first separation of
syntactic non-deterministic branching programs with a logarithmic repetition
from small monotone CNFs.


title:
$\mathcal{N}=2$ supersymmetric field theories on 3-manifolds with A-type
  boundaries

abstract:
  General half-BPS A-type boundary conditions are formulated for N=2
supersymmetric field theories on compact 3-manifolds with boundary. We observe
that under suitable conditions manifolds of the real A-type admitting two
complex supersymmetries (related by charge conjugation) possess, besides a
contact structure, a natural integrable toric foliation. A boundary, or a
general co-dimension-1 defect, can be inserted along any leaf of this preferred
foliation to produce manifolds with boundary that have the topology of a solid
torus. We show that supersymmetric field theories on such manifolds can be
endowed with half-BPS A-type boundary conditions. We specify the natural curved
space generalization of the A-type projection of bulk supersymmetries and
analyze the resulting A-type boundary conditions in generic 3d non-linear sigma
models and YM/CS-matter theories.


title:
Non-Minimality of the Width-$w$ Non-adjacent Form in Conjunction with
  Trace One $\tau$-adic Digit Expansions and Koblitz Curves in Characteristic
  Two

abstract:
  This article deals with redundant digit expansions with an imaginary
quadratic algebraic integer with trace $\pm 1$ as base and a minimal norm
representatives digit set. For $w\geq 2$ it is shown that the width-$w$
non-adjacent form is not an optimal expansion, meaning that it does not
minimize the (Hamming-)weight among all possible expansions with the same digit
set. One main part of the proof uses tools from Diophantine analysis, namely
the theory of linear forms in logarithms and the Baker--Davenport reduction
method.


title:
The adaptive-loop-gain adaptive-scale CLEAN deconvolution of radio
  interferometric images

abstract:
  CLEAN algorithms are a class of deconvolution solvers which are widely used
to remove the effect of the telescope Point Spread Function (PSF). Loop gain is
one important parameter in CLEAN algorithms. Currently the parameter is fixed
during deconvolution, which restricts the performance of CLEAN algorithms. In
this paper, we propose a new deconvolution algorithm with an adaptive loop gain
scheme, which is referred to as the adaptive-loop-gain adaptivescale CLEAN
(Algas-Clean) algorithm. The test results show that the new algorithm can give
a more accurate model with faster convergence.


title: Diagonal supercompact Radin forcing

abstract:
  Motivated by the goal of constructing a model in which there are no
$\kappa$-Aronszajn trees for any regular $\kappa>\aleph_1$, we produce a model
with many singular cardinals where both the singular cardinals hypothesis and
weak square fail.


title: Emergent friction in two-dimensional Frenkel-Kontorova models

abstract:
  Simple models for friction are typically one-dimensional, but real interfaces
are two-dimensional. We investigate the effects of the second dimension on
static and dynamic friction by using the Frenkel-Kontorova (FK) model. We study
the two most straightforward extensions of the FK model to two dimensions and
simulate both the static and dynamic properties. We show that the behavior of
the static friction is robust and remains similar in two dimensions for
physically reasonable parameter values. The dynamic friction, however, is
strongly influenced by the second dimension and the accompanying additional
dynamics and parameters introduced into the models. We discuss our results in
terms of the thermal equilibration and phonon dispersion relations of the
lattices, establishing a physically realistic and suitable two-dimensional
extension of the FK model. We find that the presence of additional dissipation
channels can increase the friction and produces significantly different
temperature-dependence when compared to the one-dimensional case. We also
briefly study the anisotropy of the dynamic friction and show highly nontrivial
effects, including that the friction anisotropy can lead to motion in different
directions depending on the value of the initial velocity.


title:
Achievable Rates for Gaussian Degraded Relay Channels with Non-Vanishing
  Error Probabilities

abstract:
  This paper revisits the Gaussian degraded relay channel, where the link that
carries information from the source to the destination is a physically degraded
version of the link that carries information from the source to the relay. The
source and the relay are subject to expected power constraints. The
$\varepsilon$-capacity of the channel is characterized and it is strictly
larger than the capacity for $\varepsilon>0$, which implies that the channel
does not possess the strong converse property. The proof of the achievability
part is based on several key ideas: block Markov coding which is used in the
classical decode-forward strategy, power control for Gaussian channels under
expected power constraints, and a careful scaling between the block size and
the total number of block uses. The converse part is proved by first
establishing two non-asymptotic lower bounds on the error probability, which
are derived from the type-II errors of some binary hypothesis tests.
Subsequently, each lower bound is simplified by conditioning on an event
related to the power of some linear combination of the codewords transmitted by
the source and the relay. Lower and upper bounds on the second-order term of
the optimal coding rate in terms of blocklength and error probability are also
obtained.


title:
Nearly massless Dirac fermions and strong Zeeman splitting in the
  nodal-line semimetal ZrSiS probed by de Haas--van Alphen quantum oscillations

abstract:
  Topological semimetals represent a new class of quantum materials hosting
Dirac/Weyl fermions. The essential properties of topological fermions can be
revealed by quantum oscillations. Here we present the first systematic de
Haas-van Alphen (dHvA) oscillation studies on the recently discovered
topological Dirac nodal-line semimetal ZrSiS. From the angular dependence of
dHvA oscillations, we have revealed the anisotropic Dirac bands in ZrSiS and
found surprisingly strong Zeeman splitting at low magnetic fields. The Land\'e
g-factor estimated from the separation of Zeeman splitting peaks is as large as
38. From the analyses of dHvA oscillations, we also revealed nearly zero
effective mass and exceptionally high quantum mobility for Dirac fermions in
ZrSiS. These results shed light on the nature of novel Dirac fermion physics of
ZrSiS.


title:
Characterisation and stability of localised bulging/necking in inflated
  membrane tubes

abstract:
  We consider localised bulging/necking in an inflated hyperelastic membrane
tube with closed ends. We first show that the initiation pressure for the onset
of localised bulging is simply the limiting pressure in uniform inflation when
the axial force is held fixed. We then demonstrate analytically how, as
inflation continues, the initial bulge grows continually in diameter until it
reaches a critical size and then propagates in both directions. The bulging
solution before propagation starts is of the solitary-wave type, whereas the
propagating bulging solution is of the kink-wave type. The stability, with
respect to axially symmetric perturbations, of both the solitary-wave type and
the kink-wave type solutions is studied by computing the Evans function using
the compound matrix method. It is found that when the inflation is
pressure-controlled, the Evans function has a single non-negative real root and
this root tends to zero only when the initiation pressure or the propagation
pressure is approached. Thus, the kink-wave type solution is probably stable
but the solitary-wave type solution is definitely unstable.


title: Index theorems for couples of holomorphic self-maps

abstract:
  Let $M$ be a $n$-dimensional complex manifold and $f,g:M\to M$ two distinct
holomorphic self-maps. Suppose that $f$ and $g$ coincide on a globally
irreducible compact hypersurface $S\subset M$. We show that if one of the two
maps is a local biholomorphism around $S'=S-\text{Sing}(S)$ and, if needed,
$S'$ sits into $M$ in a particular nice way, then it is possible to define a
$1$-dimensional holomorphic (possibly singular) foliation on $S'$ and partial
holomorphic connections on certain holomorphic vector bundles on $S'$. As a
consequence, we are able to localize suitable characteristic classes and thus
to get index theorems.


title: Structure constants of pseudo $H$-type algebras in some integral bases

abstract:
  We present the structural constants of low dimensional pseudo $H$-type
algebras.


title: Ion-proton pulsars

abstract:
  Evidence derived with minimal assumptions from existing published
observations is presented to show that an ion-proton plasma is the source of
radio-frequency emission in millisecond and in normal isolated pulsars. There
is no primary involvement of electron-positron pairs. This conclusion has also
been reached by studies of the plasma composition based on well-established
particle-physics processes in neutron stars with positive polar-cap
corotational charge density. This work has been published in a series of papers
which are also summarized here. It is now confirmed by simple analyses of the
observed radio-frequency characteristics, and its implications for the further
study of neutron stars are outlined.


title:
Steps towards the hyperfine splitting measurement of the muonic hydrogen
  ground state: pulsed muon beam and detection system characterization

abstract:
  The high precision measurement of the hyperfine splitting of the
muonic-hydrogen atom ground state with pulsed and intense muon beam requires
careful technological choices both in the construction of a gas target and of
the detectors. In June 2014, the pressurized gas target of the FAMU experiment
was exposed to the low energy pulsed muon beam at the RIKEN RAL muon facility.
The objectives of the test were the characterization of the target, the
hodoscope and the X-ray detectors. The apparatus consisted of a beam hodoscope
and X-rays detectors made with high purity Germanium and Lanthanum Bromide
crystals. In this paper the experimental setup is described and the results of
the detector characterization are presented.


title: Schr\"odinger operators with random $\delta$ magnetic fields

abstract:
  We shall consider the Schr\"odinger operators on $\mathbf{R}^2$ with random
$\delta$ magnetic fields. Under some mild conditions on the positions and the
fluxes of the $\delta$-fields, we prove the spectrum coincides with
$[0,\infty)$ and the integrated density of states (IDS) decays exponentially at
the bottom of the spectrum (Lifshitz tail), by using the Hardy type inequality
by Laptev-Weidl. We also give a lower bound for IDS at the bottom of the
spectrum.