title: Semantic Types, Lexical Sorts and Classifiers

abstract:
  We propose a cognitively and linguistically motivated set of sorts for
lexical semantics in a compositional setting: the classifiers in languages that
do have such pronouns. These sorts are needed to include lexical considerations
in a semantical analyser such as Boxer or Grail. Indeed, all proposed lexical
extensions of usual Montague semantics to model restriction of selection,
felicitous and infelicitous copredication require a rich and refined type
system whose base types are the lexical sorts, the basis of the many-sorted
logic in which semantical representations of sentences are stated. However,
none of those approaches define precisely the actual base types or sorts to be
used in the lexicon. In this article, we shall discuss some of the options
commonly adopted by researchers in formal lexical semantics, and defend the
view that classifiers in the languages which have such pronouns are an
appealing solution, both linguistically and cognitively motivated.


title: Quench-induced breathing mode of one-dimensional Bose gases

abstract:
  We measure the position- and momentum- space breathing dynamics of trapped
one-dimensional Bose gases. The profile in real space reveals sinusoidal width
oscillations whose frequency varies continuously through the quasicondensate to
ideal Bose gas crossover. A comparison with theoretical models taking into
account the effect of finite temperature is provided. In momentum space, we
report the first observation of a frequency doubling in the quasicondensate
regime, corresponding to a self-reflection mechanism. The disappearance of this
mechanism through the quasicondensation crossover is mapped out.


title:
Heat trace asymptotics and compactness of isospectral potentials for the
  Dirichlet Laplacian

abstract:
  Let $\Omega$ be a $C^\infty$-smooth bounded domain of $\mathbb{R}^n$, $n \geq
1$, and let the matrix ${\bf a} \in C^\infty (\overline{\Omega};\R^{n^2})$ be
symmetric and uniformly elliptic. We consider the $L^2(\Omega)$-realization $A$
of the operator $-\mydiv ( {\bf a} \nabla \cdot)$ with Dirichlet boundary
conditions. We perturb $A$ by some real valued potential $V \in C_0^\infty
(\Omega)$ and note $A_V=A+V$. We compute the asymptotic expansion of
$\mbox{tr}\left( e^{-t A_V}-e^{-t A}\right)$ as $t \downarrow 0$ for any matrix
${\bf a}$ whose coefficients are homogeneous of degree $0$. In the particular
case where $A$ is the Dirichlet Laplacian in $\Omega$, that is when ${\bf a}$
is the identity of $\R^{n^2}$, we make the four main terms appearing in the
asymptotic expansion formula explicit and prove that $L^\infty$-bounded sets of
isospectral potentials of $A$ are $H^s$-compact for $s <2$.


title: The upper critical field of NaFe$_{1-x}$Co$_x$As superconductors

abstract:
  The upper critical field of NaFe$_{1-x}$Co$_x$As was measured from $x=0$ to
$x=0.08$, with the magnetic field applied parallel ($H_{\rm c2}^\parallel$) and
normal ($H_{\rm c2}^\perp$) to the planes. The data were fitted using one-band
and two-band models. The orbital and paramagnetic components of the upper
critical field were extracted for $H_{\rm c2}^\parallel$, which we find to to
be strongly dominated by paramagnetic pair-breaking. In the parent compound the
paramagnetic limit is equal to the value expected by BCS theory. However,
substitution of Fe by Co leads to an enhancement above the BCS limit by a
factor of approximately 1.6. In the over-doped region, we observe a significant
convex curvature in $H_{\rm c2}^\perp$ at low temperatures, which we attribute
to the two-band nature of the superconductivity and the asymmetry between the
two bands. Additionally, we discuss the behavior of critical field anisotropy,
coherence length $\xi$, and the penetration depth $\lambda$.


title: On Hilbert's fourth problem

abstract:
  Hilbert's fourth problem asks for the construction and the study of metrics
on subsets of projective space for which the projective line segments are
geodesics. Several solutions of the problem were given so far, depending on
more precise interpretations of this problem, with various additional
conditions satisfied. The most interesting solutions are probably those
inspired from an integral formula that was first introduced in this theory by
Herbert Busemann. Besides that, Busemann and his school made a thorough
investigation of metrics defined on subsets of projective space for which the
projective lines are geodesics and they obtained several results,
characterizing several classes of such metrics. We review some of the
developments and important results related to Hilbert's problem, especially
those that arose from Busemann's work, mentioning recent results and
connections with several branches of mathematics, including Riemannian
geometry, the foundations of mathematics, the calculus of variations, metric
geometry and Finsler geometry.


title:
Real reflections, commutators and cross-ratios in complex hyperbolic
  space

abstract:
  We provide a concrete criterion to determine whether or not two given
elements of PU(2,1) can be written as products of real reflections, with one
reflection in common. As an application, we show that the Picard modular groups
${\rm PU}(2,1,\mathcal{O}_d)$ with $d=1,2,3,7,11$ are generated by real
reflections up to index 1, 2, 4 or 8.


title: Cannon-Thurston maps for Coxeter groups with signature $(n-1,1)$

abstract:
  For a Coxeter group $W$ we have an associating bi-linear form $B$ on suitable
real vector space. We assume that $B$ has the signature $(n-1,1)$ and all the
bi-linear form associating rank $n' (\ge 3)$ Coxeter subgroups generated by
subsets of $S$ has the signature $(n',0)$ or $(n'-1,1)$. Under these
assumptions, we see that there exists the Cannon-Thurston map for $W$, that is,
the $W$-equivariant continuous surjection from the Gromov boundary of $W$ to
the limit set of $W$. To see this we construct an isometric action of $W$ on an
ellipsoid with the Hilbert metric. As a consequence, we see that the limit set
of $W$ coincides with the set of accumulation points of roots of $W$.


title:
On future opportunities to observe gravitational scattering of main belt
  asteroids into NEO source regions

abstract:
  Orbital resonances are believed to be responsible for the delivery of main
belt asteroids to the inner Solar System. Several possibilities have been
suggested to transport asteroids and their fragments into mean motion and
secular resonances including non-gravitational forces and gravitational
scattering. We investigate future resonance crossings of known asteroids that
occur in the main belt over the next century. Our goal is to identify
potentially observable injections of asteroids into source regions for Near
Earth Objects (NEOs) as well as to determine the role of close encounters among
main belt asteroids in this process.


title: From electrostatic potentials to yet another triangle center

abstract:
  We study the problem of finding a point of maximal electrostatic potential
inside an arbitrary triangle with homogeneous surface charge distribution. In
this article we derive several synthetic and analytic relations for its
location in the plane. Moreover, this point satisfies the definition of a
triangle center, different from any of previously discovered centers in Clark
Kimberling's encyclopedia. Writing style is slightly informal as the paper is
targeted to a wide audience.


title: Central limit theorem for T-graphs

abstract:
  In this paper, we establish a quenched invariance principle for the random
walk on a certain class of infinite, aperiodic, oriented random planar graphs
called "T-graphs" [Kenyon-Sheffield04]. These graphs appear, together with the
corresponding random walk, in a work [Kenyon07] about the lozenge tiling model,
where they are used to compute correlations between lozenges inside large
finite domains. The random walk in question is balanced, i.e. it is
automatically a martingale.
  Our main ideas are inspired by the proof of a quenched central limit theorem
in stationary ergodic environment on $\mathbb{Z}^2$ [Lawler82, Sznitman02].
This is somewhat surprising, since the environment is neither defined on
$\mathbb{Z}^2$ nor really random: the graph is instead quasi-periodic and all
the randomness is encoded in a single random variable {\lambda} that is uniform
in the unit circle. We prove that the covariance matrix of the limiting
Brownian Motion is proportional to the identity, despite the fact that the
graph does not have obvious symmetry properties. This covariance is identified
using the knowledge of a specific discrete harmonic function on the graph,
which is provided by the link with lozenge tilings.


title: Enriched $\infty$-categories via non-symmetric $\infty$-operads

abstract:
  We set up a general theory of weak or homotopy-coherent enrichment in an
arbitrary monoidal $\infty$-category $\mathcal{V}$. Our theory of enriched
$\infty$-categories has many desirable properties; for instance, if the
enriching $\infty$-category $\mathcal{V}$ is presentably symmetric monoidal
then $\mathrm{Cat}^\mathcal{V}_\infty$ is as well. These features render the
theory useful even when an $\infty$-category of enriched $\infty$-categories
comes from a model category (as is often the case in examples of interest, e.g.
dg-categories, spectral categories, and $(\infty,n)$-categories). This is
analogous to the advantages of $\infty$-categories over more rigid models such
as simplicial categories - for example, the resulting $\infty$-categories of
functors between enriched $\infty$-categories automatically have the correct
homotopy type.
  We construct the homotopy theory of $\mathcal{V}$-enriched
$\infty$-categories as a certain full subcategory of the $\infty$-category of
"many-object associative algebras" in $\mathcal{V}$. The latter are defined
using a non-symmetric version of Lurie's $\infty$-operads, and we develop the
basics of this theory, closely following Lurie's treatment of symmetric
$\infty$-operads. While we may regard these "many-object" algebras as enriched
$\infty$-categories, we show that it is precisely the full subcategory of
"complete" objects (in the sense of Rezk, i.e. those whose space of objects is
equivalent to its space of equivalences) which are local with respect to the
class of fully faithful and essentially surjective functors. Lastly, we present
some applications of our theory, most notably the identification of associative
algebras in $\mathcal{V}$ as a coreflective subcategory of pointed
$\mathcal{V}$-enriched $\infty$-categories as well as a proof of a strong
version of the Baez-Dolan stabilization hypothesis.


title:
The penetration barrier of water through graphynes' pores:
  first-principles predictions and force field optimization

abstract:
  Graphynes are novel two-dimensional carbon-based materials that -due to their
nanoweb-like structure- have been proposed as molecular filters, especially for
water purification technologies. In this work we carry out first principles
electronic structure calculations at the MP2C level of theory to assess the
interaction between water and graphyne, graphdiyne and graphtriyne pores. The
computed penetration barriers suggest that water transport is unfeasible
through graphyne while being unimpeded for graphtriyne. Nevertheless, for
graphdiyne, which presents a pore size almost matching that of water, a low
barrier is found which in turn disappears if an active hydrogen bond with an
additional water molecule on the opposite side of the opening is taken into
account. These results support the possibility of using graphtriyne as an
efficient membrane for water filtration but, in contrast with previous
determinations, they do not exclude graphdiyne. In fact, the related first
principles penetration barrier leads to water permeation probabilities which
are at least two order of magnitude larger than those estimated by employing
commonly used force fields. A new pair potential for the water--carbon
non-covalent component of the interaction has been built and it is recommended
for molecular dynamics simulation involving graphdiyne and water.


title:
Models of cuspy triaxial stellar systems. III: The effect of velocity
  anisotropy on chaoticity

abstract:
  In several previous investigations we presented models of triaxial stellar
systems, both cuspy and non cuspy, that were highly stable and harboured large
fractions of chaotic orbits. All our models had been obtained through cold
collapses of initially spherical $N$--body systems, a method that necessarily
results in models with strongly radial velocity distributions. Here we
investigate a different method that was reported to yield cuspy triaxial models
with virtually no chaos. We show that such result was probably due to the use
of an inadequate chaos detection technique and that, in fact, models with
significant fractions of chaotic orbits result also from that method. Besides,
starting with one of the models from the first paper in this series, we
obtained three different models by rendering its velocity distribution much
less radially biased (i.e., more isotropic) and by modifying its axial ratios
through adiabatic compression. All three models yielded much higher fractions
of regular orbits than most of those from our previous work. We conclude that
it is possible to obtain stable cuspy triaxial models of stellar systems whose
velocity distribution is more isotropic than that of the models obtained from
cold collapses. Those models still harbour large fractions of chaotic orbits
and, although it is difficult to compare the results from different models, we
can tentatively conclude that chaoticity is reduced by velocity isotropy.


title:
Trigonometric parallaxes to star-forming regions within 4 kpc of the
  galactic center

abstract:
  We report four trigonometric parallaxes for high-mass star-forming regions
within 4 kpc of the Galactic center. These measurements were made with the VLBA
as part of the BeSSeL Survey. By associating these sources kinematically with
large-scale features in CO and HI longitude-velocity diagrams, we begin to
outline some major features of the inner Milky Way: the Connecting arm, the
near and far 3 kpc arms, and the Norma arm. The Connecting arm in the first
Galactic quadrant lies closer to the Galactic center than the far 3 kpc arm and
is offset by the long-bar's major axis near its leading edge, supporting the
presence of an inner Lindblad resonance. Assuming the 3 kpc arms are a
continuous physical structure, the relative Galactocentric distance of its near
and far sides suggests highly elliptical streamlines of gas around the bar(s)
and a bar corotation radius, r_CR > 3.6 kpc. At a Galactic longitude near
10{\deg} and a heliocentric distance of about 5 kpc, the near 3 kpc arm and the
Norma arm intersect on a face-on view of our Galaxy, while passing at different
Galactic latitudes. We provide an accurate distance measurement to the W31
star-forming complex of 4.95 (+0.5;-0.43) kpc from the Sun, which associates it
with a bright CO feature belonging to the near 3 kpc arm.


title: On The Center Sets and Center Numbers of Some Graph Classes

abstract:
  For a set $S$ of vertices and the vertex $v$ in a connected graph $G$,
$\displaystyle\max_{x \in S}d(x,v)$ is called the $S$-eccentricity of $v$ in
$G$. The set of vertices with minimum $S$-eccentricity is called the $S$-center
of $G$. Any set $A$ of vertices of $G$ such that $A$ is an $S$-center for some
set $S$ of vertices of $G$ is called a center set. We identify the center sets
of certain classes of graphs namely, Block graphs, $K_{m,n}$, $K_n-e$, wheel
graphs, odd cycles and symmetric even graphs and enumerate them for many of
these graph classes. We also introduce the concept of center number which is
defined as the number of distinct center sets of a graph and determine the
center number of some graph classes.


title:
Privacy Impacts of Data Encryption on the Efficiency of Digital
  Forensics Technology

abstract:
  Owing to a number of reasons, the deployment of encryption solutions are
beginning to be ubiquitous at both organizational and individual levels. The
most emphasized reason is the necessity to ensure confidentiality of privileged
information. Unfortunately, it is also popular as cyber-criminals' escape route
from the grasp of digital forensic investigations. The direct encryption of
data or indirect encryption of storage devices, more often than not, prevents
access to such information contained therein. This consequently leaves the
forensics investigation team, and subsequently the prosecution, little or no
evidence to work with, in sixty percent of such cases. However, it is
unthinkable to jeopardize the successes brought by encryption technology to
information security, in favour of digital forensics technology. This paper
examines what data encryption contributes to information security, and then
highlights its contributions to digital forensics of disk drives. The paper
also discusses the available ways and tools, in digital forensics, to get
around the problems constituted by encryption. A particular attention is paid
to the Truecrypt encryption solution to illustrate ideas being discussed. It
then compares encryption's contributions in both realms, to justify the need
for introduction of new technologies to forensically defeat data encryption as
the only solution, whilst maintaining the privacy goal of users.


title: Efficient Dynamic Access Analysis Using JavaScript Proxies

abstract:
  JSConTest introduced the notions of effect monitoring and dynamic effect
inference for JavaScript. It enables the description of effects with path
specifications resembling regular expressions. It is implemented by an offline
source code transformation.
  To overcome the limitations of the JSConTest implementation, we redesigned
and reimplemented effect monitoring by taking advantange of JavaScript proxies.
Our new design avoids all drawbacks of the prior implementation. It guarantees
full interposition; it is not restricted to a subset of JavaScript; it is
self-maintaining; and its scalability to large programs is significantly better
than with JSConTest.
  The improved scalability has two sources. First, the reimplementation is
significantly faster than the original, transformation-based implementation.
Second, the reimplementation relies on the fly-weight pattern and on trace
reduction to conserve memory. Only the combination of these techniques enables
monitoring and inference for large programs.


title:
New mechanism for Type-II seesaw dominance in SO(10) with low-mass
  Z-prime, RH neutrinos, and verifiable LFV, LNV, and proton decay

abstract:
  Dominance of type-II seesaw mechanism for neutrino masses has attracted
considerable attention because of a number of advantages. We show a novel
approach to achieve Type-II seesaw dominance in non-supersymmetric $SO(10)$
grand unification where a low mass $Z^{\prime}$ boson and specific patterns of
right-handed neutrino masses are predicted within the accessible energy range
of the Large Hadron Collider. In spite of the high value of the seesaw scale,
$M_{\Delta_L} \simeq 10^8-10^9$ GeV, the model predicts new dominant
contributions to neutrino-less double beta decay in the $W_L-W_L$ channel close
to the current experimental limits via exchanges of heavier singlet fermions
used as essential ingredients of this model even when the light active neutrino
masses are normally hierarchical or invertedly hierarchical. We obtain upper
bounds on the lightest sterile neutrino mass $m_s\lesssim 3.0$ GeV, $2.0$ GeV,
and $0.7$ GeV for normally hierarchical, invertedly hierarchical, and
quasi-degenerate patterns of light neutrino masses, respectively. The
underlying non-unitarity effects lead to lepton flavor violating decay
branching ratios within the reach of ongoing or planned experiments and the
leptonic CP-violation parameter nearly two orders larger than the quark sector.
Some of the predicted values on proton lifetime for $p\to e^+\pi^0$ are found
to be within the currently accessible search limits. Other aspects of model
applications including leptogenesis etc. are briefly indicated.


title:
FIESTA 3: cluster-parallelizable multiloop numerical calculations in
  physical regions

abstract:
  The goal of this paper is to present a new major release of the program
FIESTA (Feynman Integral Evaluation by a Sector decomposiTion Approach). This
version presents features like cluster-parallelization, new asymptotic
expansion algorithms, calculations in physical regions, new
sector-decomposition strategies, as well as multiple speed, memory, and
stability improvements.


title: Simplicity of twists of abelian varieties

abstract:
  We give some easy necessary and sufficient criteria for twists of abelian
varieties by Artin representations to be simple.


title:
A Simple Sweep Line Algorithm for Counting Triangulations and
  Pseudo-triangulations

abstract:
  Let $P\subset\mathbb{R}^{2}$ be a set of $n$ points. In this paper we show
two new algorithms, one to compute the number of triangulations of $P$, and one
to compute the number of pseudo-triangulations of $P$. We show that our
algorithms run in time $O^{*}(t(P))$ and $O^{*}(pt(P))$ respectively, where
$t(P)$ and $pt(P)$ are the largest number of triangulation paths (T-paths) and
pseudo-triangulations paths (PT-paths), respectively, that the algorithms
encounter during their execution. Moreover, we show that $t(P) = O^{*}(9^{n})$,
which is the first non-trivial bound on $t(P)$ to be known.
  While there already are algorithms that count triangulations in
$O^{*}\left(2^n\right)$, and $O^{*}\left(3.1414^{n}\right)$, there are sets of
points where the number of T-paths is $O(2^{n})$. In such cases the algorithm
herein presented could potentially be faster. Furthermore, it is not clear
whether the already-known algorithms can be modified to count
pseudo-triangulations so that their running times remain $O^{*}(c^n)$, for some
small constant $c\in\mathbb{R}$. Therefore, for counting pseudo-triangulations
(and possibly other similar structures) our approach seems better.


title: Electric and magnetic response of hot QCD matter

abstract:
  We study the electric conductivity as well as the magnetic response of hot
QCD matter at various temperatures $T$ and chemical potentials $\mu_q$ within
the off-shell Parton-Hadron-String Dynamics (PHSD) transport approach for
interacting partonic systems in a finite box with periodic boundary conditions.
The response of the strongly-interacting system in equilibrium to an external
electric field defines the electric conductivity $\sigma_0$ whereas the
response to a moderate external magnetic field defines the induced diamagnetic
moment $\mu_L$ ($T, \mu_q$) as well as the spin susceptibility $\chi_S(T,
\mu_q)$. We find a sizeable temperature dependence of the dimensionless ratio
$\sigma_0/T$ well in line with calculations in a relaxation time approach for
$T_c \! < \! T < \! 2.5 \!\, T_c$ as well as an increase of $\sigma_0$ with
$\mu_q^2/T^2$. Furthermore, the frequency dependence of the electric
conductivity $\sigma(\Omega)$ shows a simple functional form well in line with
results from the Dynamical QuasiParticle Model (DQPM). The spin susceptibility
$\chi_S(T,\mu_q)$ is found to increase with temperature $T$ and to rise $\sim
\mu_q ^2/T^2$, too. The actual values for the magnetic response of the QGP in
the temperature range below 250 MeV show that the QGP should respond
diamagnetically in actual ultra-relativistic heavy-ion collisions since the
maximal magnetic fields created in these collisions are smaller than $B_c(T)$
which defines a boundary between diamagnetism and paramagnetism.


title:
PLUMED-GUI: an environment for the interactive development of molecular
  dynamics analysis and biasing scripts

abstract:
  PLUMED-GUI is an interactive environment to develop and test complex PLUMED
scripts within the Visual Molecular Dynamics (VMD) environment. Computational
biophysicists can take advantage of both PLUMED's rich syntax to define
collective variables (CVs) and VMD's chemically-aware atom selection language,
while working within a natural point-and-click interface. Pre-defined templates
and syntax mnemonics facilitate the definition of well-known reaction
coordinates. Complex CVs, e.g. involving reference snapshots used for RMSD or
native contacts calculations, can be built through dialogs that provide a
synoptic view of the available options. Scripts can be either exported for use
in simulation programs, or evaluated on the currently loaded molecular
trajectories. Development of scripts takes place without leaving VMD, thus
enabling an incremental try-see-modify development model for molecular metrics.


title: Closed loop simulations of the thermal experiments in LISA Pathfinder

abstract:
  The thermal experiments to be carried out onboard LISA Pathfinder (LPF) will
provide essential information of the dependences of the instrument with respect
to temperature variations. These thermal experiments must be modelled and
simulated both to be validated for mission operations purposes and also to
develop a data analysis tool able to characterise the temperature noise
contribution to the instrument performance. Here we will present the models
developed and the simulated signals for some of the experiments together with
the corresponding interferometer readouts, the latter being computed by
combining the thermal models with the global LTP (LISA Technology Package)
simulator of the LTP Data Analysis team.


title: The Galactic Bulge Survey: completion of the X-ray survey observations

abstract:
  We provide the Chandra source list for the last ~quarter of the area covered
by the Galactic Bulge Survey (GBS). The GBS targets two strips of 6\degr x
1\degr (12 square degrees in total), one above (1\degr<b<2\degr) and one below
(-2\degr<b<-1\degr) the Galactic plane in the direction of the Galactic Center
at X-ray, optical and near-infrared wavelengths. For the X-ray part of the
survey we use 2 ks per Chandra pointing. We find 424 X-ray sources in the 63
Chandra observations we report on here. These sources are in addition to the
1216 X-ray sources discovered in the first part of the GBS survey described
before. We discuss the characteristics and the X-ray variability of the
brightest of the sources as well as the radio properties from existing radio
surveys. We point out an interesting asymmetry in the number of X-ray sources
as a function of their Galactic l and b coordinates which is probably caused by
differences in average extinction towards the different parts of the GBS survey
area.


title: Iterated group products and leakage resilience against NC^1

abstract:
  We show that if NC$^1 \neq$ L, then for every element $\alpha$ of the
alternating group $A_t$, circuits of depth $O(\log t)$ cannot distinguish
between a uniform vector over $(A_t)^t$ with product $= \alpha$ and one with
product $=$ identity. Combined with a recent construction by the author and
Viola in the setting of leakage-resilient cryptography [STOC '13], this gives a
compiler that produces circuits withstanding leakage from NC$^1$ (assuming
NC$^1 \neq$ L). For context, leakage from NC$^1$ breaks nearly all previous
constructions, and security against leakage from P is impossible. %In the
multi-query setting, circuits produced by this compiler use a simple secure
hardware component.
  We build on work by Cook and McKenzie [J.\ Algorithms '87] establishing the
relationship between L $=$ logarithmic space and the symmetric group $S_t$. Our
techniques include a novel algorithmic use of commutators to manipulate the
cycle structure of permutations in $A_t$.


title:
Error-Correcting Regenerating and Locally Repairable Codes via
  Rank-Metric Codes

abstract:
  This paper presents and analyzes a novel concatenated coding scheme for
enabling error resilience in two distributed storage settings: one being
storage using existing regenerating codes and the second being storage using
locally repairable codes. The concatenated coding scheme brings together a
maximum rank distance (MRD) code as an outer code and either a globally
regenerating or a locally repairable code as an inner code. Also, error
resilience for combination of locally repairable codes with regenerating codes
is considered. This concatenated coding system is designed to handle two
different types of adversarial errors: the first type includes an adversary
that can replace the content of an affected node only once; while the second
type studies an adversary that is capable of polluting data an unbounded number
of times. The paper establishes an upper bound on the resilience capacity for a
locally repairable code and proves that this concatenated coding coding scheme
attains the upper bound on resilience capacity for the first type of adversary.
Further, the paper presents mechanisms that combine the presented concatenated
coding scheme with subspace signatures to achieve error resilience for the
second type of errors.


title:
Chemical Composition of the Atmospheres of Red Giants with High Space
  Velocities

abstract:
  The results of a comparative analysis of the elemental abundances in the
atmospheres of 14 red giants with high Galactic space velocities are presented.
For almost all of the chemical elements considered, the their abundance trends
with metallicity correspond to those constructed for thick-disk dwarfs. In the
case of sodium, the main factor affecting the [Na/Fe] abundance in the stellar
atmosphere for red giants is the surface gravity that characterizes the degree
of development of the convective envelope. The difference between the [Na/Fe]
abundances in the atmospheres of thin-and thick-disk red giants has been
confirmed.


title:
A classification result for helix surfaces with parallel mean curvature
  in product spaces

abstract:
  We determine all helix surfaces with parallel mean curvature vector field,
which are not minimal or pseudo-umbilical, in spaces of type
$M^n(c)\times\mathbb{R}$, where $M^n(c)$ is a simply-connected $n$-dimensional
manifold with constant sectional curvature $c$.


title: Heavy-meson semileptonic decays for the Standard Model and beyond

abstract:
  We calculate the form factors for the semileptonic decays $B_s\to K\ell\nu$
and $B\to K\ell\ell$ with lattice QCD. We work at several lattice spacings and
a range of light quark masses, using the MILC 2+1-flavor asqtad ensembles. We
use the Fermilab method for the $b$ quark. We obtain chiral-continuum
extrapolations for $E_K$ up to $\sim1.2$ GeV and then extend to the entire
kinematic range with the model-independent $z$ expansion.


title: Secrecy Capacity Scaling in Large Cooperative Wireless Networks

abstract:
  We investigate large wireless networks subject to security constraints. In
contrast to point-to-point, interference-limited communications considered in
prior works, we propose active cooperative relaying based schemes. We consider
a network with $n_l$ legitimate nodes, $n_e$ eavesdroppers, and path loss
exponent $\alpha\geq 2$. As long as $n_e^2(\log(n_e))^{\gamma}=o(n_l)$, for
some positive $\gamma$, we show one can obtain unbounded secure aggregate rate.
This means zero-cost secure communication, given fixed total power constraint
for the entire network. We achieve this result through (i) the source using
Wyner randomized encoder and a serial (multi-stage) block Markov scheme, to
cooperate with the relays and (ii) the relays acting as a virtual multi-antenna
to apply beamforming against the eavesdroppers. Our simpler parallel
(two-stage) relaying scheme can achieve the same unbounded secure aggregate
rate when
$n_e^{\frac{\alpha}{2}+1}(\log(n_e))^{\gamma+\delta(\frac{\alpha}{2}+1)}=o(n_l)$
holds, for some positive $\gamma,\delta$. Finally, we study the improvement (to
the detriment of legitimate nodes) the eavesdroppers achieve in terms of the
information leakage rate in a large cooperative network in case of collusion.
We show that again the zero-cost secure communication is possible, if
$n_e^{(2+\frac{2}{\alpha})}(\log n_e)^{\gamma}=o(n_l)$ holds, for some positive
$\gamma$; i.e., in case of collusion slightly fewer eavesdroppers can be
tolerated compared to the non-colluding case.


title:
Thickness Mapping of Eleven Retinal Layers in Normal Eyes Using Spectral
  Domain Optical Coherence Tomography

abstract:
  Purpose. This study was conducted to determine the thickness map of eleven
retinal layers in normal subjects by spectral domain optical coherence
tomography (SD-OCT) and evaluate their association with sex and age. Methods.
Mean regional retinal thickness of 11 retinal layers were obtained by automatic
three-dimensional diffusion-map-based method in 112 normal eyes of 76 Iranian
subjects. Results. The thickness map of central foveal area in layer 1, 3, and
4 displayed the minimum thickness (P<0.005 for all). Maximum thickness was
observed in nasal to the fovea of layer 1 (P<0.001) and in a circular pattern
in the parafoveal retinal area of layers 2, 3 and 4 and in central foveal area
of layer 6 (P<0.001). Temporal and inferior quadrants of the total retinal
thickness and most of other quadrants of layer 1 were significantly greater in
the men than in the women. Surrounding eight sectors of total retinal thickness
and a limited number of sectors in layer 1 and 4 significantly correlated with
age. Conclusion. SD-OCT demonstrated the three-dimensional thickness
distribution of retinal layers in normal eyes. Thickness of layers varied with
sex and age and in different sectors. These variables should be considered
while evaluating macular thickness.


title: Constrained Colluding Eavesdroppers: An Information-Theoretic Model

abstract:
  We study the secrecy capacity in the vicinity of colluding eavesdroppers.
Contrary to the perfect collusion assumption in previous works, our new
information-theoretic model considers constraints in collusion. We derive the
achievable secure rates (lower bounds on the perfect secrecy capacity), both
for the discrete memoryless and Gaussian channels. We also compare the proposed
rates to the non-colluding and perfect colluding cases.


title: Heater induced thermal effects on the LTP dynamics

abstract:
  The STOC (Science and Technology Operations Centre) simulator of the LPF
(LISA PathFinder) mission is intended to provide a validation tool for the
mission operations tele-commanding chain, as well as for a deeper understanding
of the underlying physical processes happening in the LTP (LISA Technology
Package). Amongst the different physical effects that will appear onboard,
temperature fluctuations in the Electrode Housing (EH) could generate
disturbances on the interferometer (IFO) readouts, therefore they must be known
and controlled. In this article we report on the latest progress in the
analysis at IEEC of the LTP response to thermal signals injected by means of
heaters. More specifically, we determine the transfer functions relating heat
input signals to forces on the Test Masses (TMs) in the LTP frequency band,
from 1 mHz to 30 mHz. A complete thermal model of the entire LPF spacecraft
plus payload, elaborated and maintained at European Space Technology Center
(ESTEC), was used to obtain temperature distributions in response to heat
inputs at prescribed spots (heaters), which are later processed to calculate
the associated dynamical effects on the Test Masses.


title: Qualitative analysis of collapsing isotropic fluid spacetimes

abstract:
  The structure of the Einstein field equations describing the gravitational
collapse of spherically symmetric isotropic fluids is analyzed here for general
equations of state. A suitable system of coordinates is constructed which
allows us, under a hypothesis of Taylor-expandability with respect to one of
the coordinates, to approach the problem of the nature of the final state
without knowing explicitely the metric. The method is applied to investigate
the singularities of linear barotropic perfect fluids solutions and to a family
of accelerating fluids.


title:
Exact Reconstruction of Spatially Undersampled Signals in Evolutionary
  Systems

abstract:
  We consider the problem of spatiotemporal sampling in which an initial state
$f$ of an evolution process $f_t=A_tf$ is to be recovered from a combined set
of coarse samples from varying time levels $\{t_1,\dots,t_N\}$. This new way of
sampling, which we call dynamical sampling, differs from standard sampling
since at any fixed time $t_i$ there are not enough samples to recover the
function $f$ or the state $f_{t_i}$. Although dynamical sampling is an inverse
problem, it differs from the typical inverse problems in which $f$ is to be
recovered from $A_Tf$ for a single time $T$. In this paper, we consider signals
that are modeled by $\ell^2(\mathbb Z)$ or a shift invariant space $V\subset
L^2(\mathbb R)$.


title: Dressing a black hole with a time-dependent Galileon

abstract:
  We present a class of exact scalar-tensor black holes for a shift-symmetric
part of the Horndeski action. The action includes a higher order scalar tensor
interaction term. We find that for a static and spherically symmetric
space-time, the scalar field, if time dependent, can be non-trivial and regular
thus circumventing in an interesting way no-hair arguments for gallileons.
Furthermore, within this class we find a stealth Schwarzschild and a partially
self-tuned de-Sitter Schwarzschild black hole, both exhibiting a non trivial
and regular space and time dependent scalar. In the latter solution the bulk
vacuum energy is screened from a necessarily smaller geometric effective de
Sitter vacuum via an integration constant associated to the time dependent
scalar field.


title: Electronic structure and transport in approximants of the Penrose tiling

abstract:
  We present numerical calculations of electronic structure and transport in
Penrose approximants. The electronic structure of perfect approximants shows a
spiky density of states and a tendency to localization that is more pronounced
in the middle of the band. Near the band edges the behavior is more similar to
that of free electrons. These calculations of band structure and in particular
the band scaling suggest an anomalous quantum diffusion when compared to normal
ballistic crystals. This is confirmed by a numerical calculation of quantum
diffusion which shows a crossover from normal ballistic propagation at long
times to anomalous, possibly insulator-like, behavior at short times. The time
scale t*(E) for this crossover is computed for several approximants and is
detailed. The consequences for electronic conductivity are discussed in the
context of the relaxation time approximation. The metallic like or non metallic
like behavior of the conductivity is dictated by the comparison between the
scattering time due to defects and the time scale t*(E).


title:
Evolution of female choice and age-dependent male traits with paternal
  germ-line mutation

abstract:
  Several studies question the adaptive value of female preferences for older
males. Theory and evidence show that older males carry more deleterious
mutations in their sperm than younger males carry. These mutations are not
visible to females choosing mates. Germ-line mutations could oppose preferences
for "good genes." Choosy females run the risk that offspring of older males
will be no more attractive or healthy than offspring of younger males.
Germ-line mutations could pose a particular problem when females can only judge
male trait size, rather than assessing age directly. I ask whether or not
females will prefer extreme traits, despite reduced offspring survival due to
age-dependent mutation. I use a quantitative genetic model to examine the
evolution of female preferences, an age-dependent male trait, and overall
health ("condition"). My dynamical equation includes mutation bias that depends
on the generation time of the population. I focus on the case where females
form preferences for older males because male trait size depends on male age.
My findings agree with good genes theory. Females at equilibrium always select
above-average males. The trait size preferred by females directly correlates
with the direct costs of the preference. Direct costs can accentuate the
equilibrium preference at a higher rate than mutational parameters. Females can
always offset direct costs by mating with older, more ornamented males.
Age-dependent mutation in condition maintains genetic variation in condition
and thereby maintains the selective value of female preferences. Rather than
eliminating female preferences, germ-line mutations provide an essential
ingredient in sexual selection.


title:
Positive representations, multiplier Hopf algebra, and continuous
  canonical basis

abstract:
  We introduce the language of multiplier Hopf algebra in the context of
positive representations of split real quantum groups, and discuss its
applications with a continuous version of Lusztig-Kashiwara's canonical basis,
which may provide a key to prove the closure of the positive representations
under tensor products, and harmonic analysis of quantized algebra of functions
in the sense of locally compact quantum groups.


title: Viable cosmological solutions in massive bimetric gravity

abstract:
  We find the general conditions for viable cosmological solution at the
background level in bigravity models. Furthermore, we constrain the parameters
by comparing to the Union 2.1 supernovae catalog and identify, in some cases
analytically, the best fit parameter or the degeneracy curve among pairs of
parameters. We point out that a bimetric model with a single free parameter
predicts a simple relation between the equation of state and the density
parameter, fits well the supernovae data and is a valid and testable
alternative to $\Lambda$CDM. Additionally, we identify the conditions for a
phantom behavior and show that viable bimetric cosmologies cannot cross the
phantom divide.


title:
Structure and thermodynamic properties of a weakly-coupled
  antiferromagnetic spin-1/2 chain compound (C5H12N)CuBr3

abstract:
  Single crystals of a metal organic complex \ce{(C5H12N)CuBr3} (\ce{C5H12N} =
piperidinium, pipH for short) have been synthesized and the structure was
determined by single-crystal X-ray diffraction. \ce{(pipH)CuBr3} crystallizes
in the monoclinic group $C$2/$c$. Edging-sharing \ce{CuBr5} units link to form
zigzag chains along the $c$ axis and the neighboring Cu(II) ions with spin-1/2
are bridged by bi-bromide ions. Magnetic susceptibility data down to 1.8 K can
be well fitted by the Bonner-Fisher formula for antiferromagnetic spin-1/2
chain, giving the intrachain magnetic coupling constant $J$ $\sim$ 17 K. At
zero field, \ce{(pipH)CuBr3} shows three-dimensional (3D) order below $T_N$ =
1.68 K. Calculated by the mean-field theory, the interchain coupling constant
$J'$ = 0.65 K is obtained and the ordered magnetic moment $m_0$ is about 0.20
$\mu_B$. This value of $m_0$ makes \ce{(pipH)CuBr3} a rare compound suitable to
study the dimensional crossover problem in magnetism, since both 3D order and
one-dimensional (1D) quantum fluctuations are prominent. In addition, specific
heat measurements reveal two successive magnetic transitions with lowering
temperature when external field $H \geq$ 3 T is applied along the $a'$ axis.
The $H$ - $T$ phase diagram of \ce{(pipH)CuBr3} is roughly constructed. The
interplay between exchange interactions, dimensionality, Zeeman energy and
possible Dzyaloshinkii-Moriya interaction should be the driving force for the
multiple phase transitions.


title:
Inhibiting unwanted transitions in population transfer in two- and
  three-level quantum systems

abstract:
  We examine the stability of population transfer in two- and three-level
systems against unwanted additional transitions. This population inversion is
achieved by using recently proposed schemes called "shortcuts to adiabaticity".
We quantify and compare the sensitivity of different schemes to these unwanted
transitions. Finally, we provide examples of shortcut schemes which lead to a
zero transition sensitivity in certain regimes, i.e. which lead to a nearly
perfect population inversion even in the presence of unwanted transitions.


title: Barrier Option Pricing

abstract:
  We use Lie symmetry methods to price certain types of barrier options.
Usually Lie symmetry methods cannot be used to solve the Black-Scholes equation
for options because the function defining the maturity condition for an option
is not smooth. However, for barrier options, this restriction can be
accommodated and a symmetry analysis utilised to find new solutions.


title:
Outflows from active galactic nuclei: The BLR-NLR metallicity
  correlation

abstract:
  The metallicity of active galactic nuclei (AGNs), which can be measured by
emission line ratios in their broad and narrow line regions (BLRs and NLRs),
provides invaluable information about the physical connection between the
different components of AGNs. From the archival databases of the International
Ultraviolet Explorer, the Hubble Space Telescope and the Sloan Digital Sky
Survey, we have assembled the largest sample available of AGNs which have
adequate spectra in both the optical and ultraviolet bands to measure the
narrow line ratio [N II]/H{\alpha} and also, in the same objects, the
broad-line N V/C IV ratio. These permit the measurement of the metallicities in
the NLRs and BLRs in the same objects. We find that neither the BLR nor the NLR
metallicity correlate with black hole masses or Eddington ratios, but there is
a strong correlation between NLR and BLR metallicities. This metallicity
correlation implies that outflows from BLRs carry metal-rich gas to NLRs at
characteristic radial distances of ~ 1.0 kiloparsec. This chemical connection
provides evidence for a kinetic feedback of the outflows to their hosts. Metals
transported into the NLR enhance the cooling of the ISM in this region, leading
to local star formation after the AGNs turn to narrow line LINERs. This
post-AGN star formation is predicted to be observable as an excess continuum
emission from the host galaxies in the near infrared and ultraviolet, which
needs to be further explored.


title: Les connaissances de la toile

abstract: How to manage knowledge on the Web.


title:
The Chen-Chv\'atal conjecture for metric spaces induced by
  distance-hereditary graphs

abstract:
  A special case of a theorem of De Bruijn and Erd\H{o}s asserts that any
noncollinear set of $n$ points in the plane determines at least $n$ distinct
lines. Chen and Chv\'atal conjectured a generalization of this result to
arbitrary finite metric spaces, with a particular definition of lines in a
metric space. We prove it for metric spaces induced by connected
distance-hereditary graphs -- a graph $G$ is called distance-hereditary if the
distance between two vertices $u$ and $v$ in any connected induced subgraph $H$
of $G$ is equal to the distance between $u$ and $v$ in $G$.


title: Decomposition of multiple packings with subquadratic union complexity

abstract:
  Suppose $k$ is a positive integer and $\mathcal{X}$ is a $k$-fold packing of
the plane by infinitely many arc-connected compact sets, which means that every
point of the plane belongs to at most $k$ sets. Suppose there is a function
$f(n)=o(n^2)$ with the property that any $n$ members of $\mathcal{X}$ determine
at most $f(n)$ holes, which means that the complement of their union has at
most $f(n)$ bounded connected components. We use tools from extremal graph
theory and the topological Helly theorem to prove that $\mathcal{X}$ can be
decomposed into at most $p$ ($1$-fold) packings, where $p$ is a constant
depending only on $k$ and $f$.


title: General treatment for dark energy thermodynamics

abstract:
  In this work we discuss a general approach for the dark energy thermodynamics
considering a varying equation of state (EoS) parameter of the type
$\omega(a)=\omega_0+F(a)$ and taking into account the role of a non-zero
chemical potential $\mu$. We derive generalized expressions for the entropy
density, chemical potential and dark energy temperature $T$ and use the
positiveness of the entropy to impose thermodynamic bounds on the EoS parameter
$\omega(a)$. In particular, we find that a phantom-like behavior $\omega(a)<
-1$ is allowed only when the chemical potential assumes negative values
($\mu<0$).


title:
Measurement of the radiative decay of polarized muons in the MEG
  experiment

abstract:
  We studied the radiative muon decay $\mu^+ \to e^+\nu\bar{\nu}\gamma$ by
using for the first time an almost fully polarized muon source. We identified a
large sample (~13000) of these decays in a total sample of 1.8x10^14 positive
muon decays collected in the MEG experiment in the years 2009--2010 and
measured the branching ratio B($\mu^+ \to e^+\nu\bar{\nu}\gamma$) =
(6.03+-0.14(stat.)+-0.53(sys.))x10^-8 for E_e > 45 MeV and E_{\gamma} > 40 MeV,
consistent with the Standard Model prediction. The precise measurement of this
decay mode provides a basic tool for the timing calibration, a normalization
channel, and a strong quality check of the complete MEG experiment in the
search for $\mu^+ \to e^+\gamma$ process.


title:
The existence of a quantum phase transition in a Hubbard model on a
  quasi-one-dimentional two-leg ladder

abstract:
  A canonical transformation of a new type is offered as the mean for studying
properties of a system of strongly correlated electrons. As an example of the
utility of the transformation, it is used to demonstrate the existence of a
quantum phase transition in a Hubbard-like model on a quasi-one- dimensional
two-leg ladder.


title:
The influence of the enhanced vector meson sector on the properties of
  the matter of neutron stars

abstract:
  This paper gives an overview of the model of a neutron star with non-zero
strangeness constructed within the framework of the nonlinear realization of
the chiral $SU(3)_{L}\times SU(3)_{R}$ symmetry. The emphasis is put on the
physical properties of the matter of a neutron star. The obtained solution is
particularly aimed at the problem of the construction of a theoretical model of
a neutron star matter with hyperons that will give high value of the maximum
mass.


title: Multisymplectic effective General Boundary Field Theory

abstract:
  The transfer matrix in lattice field theory connects the covariant and the
initial data frameworks; in spin foam models, it can be written as a
composition of elementary cellular amplitudes/propagators. We present a
framework for discrete spacetime classical field theory in which solutions to
the field equations over elementary spacetime cells may be amalgamated if they
satisfy simple gluing conditions matching the composition rules of cellular
amplitudes in spin foam models. Furthermore, the formalism is endowed with a
multisymplectic structure responsible for local conservation laws.
  Some models within our framework are effective theories modeling a system at
a given scale. Our framework allows us to study coarse graining and the
continuum limit.


title:
Transport-limited water splitting at ion-selective interfaces during
  concentration polarization

abstract:
  We present an analytical model of salt- and water-ion transport across an
ion-selective interface based on an assumption of local equilibrium of the
water-dissociation reaction. The model yields current-voltage characteristics
and curves of water-ion current versus salt-ion current, which are in
qualitative agreement with experimental results published in the literature.
The analytical results are furthermore in agreement with direct numerical
simulations. As part of the analysis, we find approximate solutions to the
classical problem of pure salt transport across an ion-selective interface.
These solutions provide closed-form expressions for the current-voltage
characteristics, which include the overlimiting current due to the development
of an extended space charge region. Finally, we discuss how the addition of an
acid or a base affects the transport properties of the system and thus provide
predictions accessible to further experimental tests of the model.


title: Mobile Robots in Teaching Programming for IT Engineers and its Effects

abstract:
  In this paper the new methods and devices introduced into the learning
process of programming for IT engineers at our college is described. Based on
our previous research results we supposed that project methods and some new
devices can reduce programming problems during the first term. These problems
are rooted in the difficulties of abstract thinking and they can cause the
decrease of programming self-concept and other learning motives. We redesigned
the traditional learning environment. As a constructive approach project method
was used. Our students worked in groups of two or three; small problems were
solved after every lesson. In the problem solving process students use
programmable robots (e.g. Surveyor, LEGO NXT and RCX). They had to plan their
program, solve some technical problems and test their solution. The usability
of mobile robots in the learning process and the short-term efficiency of our
teaching method were checked with a control group after a semester (n = 149).
We examined the effects on our students' programming skills and on their
motives, mainly on their attitudes and programming self-concept. After a
two-year-long period we could measure some positive long-term effects.


title: Formation of Molecular Clouds and Global Conditions for Star Formation

abstract:
  Giant molecular clouds (GMCs) are the primary reservoirs of cold,
star-forming molecular gas in the Milky Way and similar galaxies, and thus any
understanding of star formation must encompass a model for GMC formation,
evolution, and destruction. These models are necessarily constrained by
measurements of interstellar molecular and atomic gas, and the emergent,
newborn stars. Both observations and theory have undergone great advances in
recent years, the latter driven largely by improved numerical simulations, and
the former by the advent of large-scale surveys with new telescopes and
instruments. This chapter offers a thorough review of the current state of the
field.


title: Lattice polarized irreducible holomorphic symplectic manifolds

abstract:
  We generalize Nikulin's and Dolgachev's lattice-theoretical mirror symmetry
for K3 surfaces to lattice polarized higher dimensional irreducible holomorphic
symplectic manifolds. In the case of fourfolds of $K3^{\left[2\right]}-$type we
then describe mirror families of polarized fourfolds and we give an example
with mirror non-symplectic involutions.


title:
New limit on Lorentz and CPT violating neutron spin interactions using a
  free precession 3He-129Xe co-magnetometer

abstract:
  We report on the search for a CPT and Lorentz invariance violating coupling
of the 3He and 129Xe nuclear spins (each largely determined by a valence
neutron) to background tensor fields which permeate the universe. Our
experimental approach is to measure the free precession of nuclear spin
polarized 3He and 129Xe atoms in a homogeneous magnetic guiding field of about
400 nT using LTC SQUIDs as low-noise magnetic flux detectors. As the laboratory
reference frame rotates with respect to distant stars, we look for a sidereal
modulation of the Larmor frequencies of the co-located spin samples. As a
result we obtain an upper limit on the equatorial component of the background
field interacting with the spin of the bound neutron bn< 6.7*10^-34 GeV (68%
C.L.). Our result improves our previous limit (data measured in 2009) by a
factor of 30 and the world's best limit by a factor of 5.


title:
Observation of topological crystalline insulator surface states on
  (111)-oriented Pb$_{1-x}$Sn$_{x}$Se films

abstract:
  We present angle resolved photoemission spectroscopy measurements of the
surface states on in-situ grown (111) oriented films of Pb$_{1-x}$Sn$_{x}$Se, a
three dimensional topological crystalline insulator. We observe surface states
with Dirac-like dispersion at $\bar{\Gamma}$ and $\bar{M}$ in the surface
Brillouin zone, supporting recent theoretical predictions for this family of
materials. We study the parallel dispersion isotropy and Dirac-point binding
energy of the surface states, and perform tight-binding calculations to support
our findings. The relative simplicity of the growth technique is encouraging,
and suggests a clear path for future investigations into the role of strain,
vicinality and alternative surface orientations in (Pb,Sn)Se compounds.


title: Noise Studies of Driven Geometric Phase Gates with Trapped Ions

abstract:
  We present a study of the performance of the trapped-ion driven geometric
phase gates introduced in [New J. Phys. 15, 083001 (2013)] when realized in a
stimulated Raman transition. We show that the gate can achieve errors below the
fault-tolerance threshold in the presence of laser intensity fluctuations. We
also find that, in order to reduce the errors due to photon scattering below
the fault-tolerance threshold, very intense laser beams are required to allow
for large detunings in the Raman configuration without compromising the gate
speed.


title: Thermoelectric Properties of Nanocomposite Heavy Fermion CeCu6

abstract:
  Samples of heavy fermion compound CeCu6 were prepared by hot-press technique.
Temperature-dependent (5-300 K) thermoelectric transport properties of the
samples were measured. The dimensionless figure-of-merit (ZT) was optimized by
varying the hot-pressing temperature. Our measurements of thermal conductivity
show that the lowest hot pressing temperature (450 C) produces the lowest
thermal conductivity. Electrical resistivity increases significantly while the
Seebeck coefficient decreases with decrease in the hot pressing temperature. As
the hot-pressing temperature decreases, electronic contribution to the total
thermal conductivity decreased more rapidly than the lattice contribution did.
As a result, for lower hot-pressing temperature the gain in thermal
conductivity reduction was offset by the loss in power factor. Our ZT
calculations show a broad peak with a maximum value of 0.024 at 60 K for the
sample hot pressed at 800 C. The pronounced low-temperature ZT peak emphasizes
the importance of this heavy fermion system as a potential p-type
thermoelectric for solid state cooling applications.


title:
Low field magnetic response of the non-centrosymmetric superconductor
  YPtBi

abstract:
  The low-field magnetic response of the non-centrosymmetric superconductor
YPtBi ($T_c =0.77$ K) is investigated. Ac-susceptibility and dc-magnetization
measurements provide solid evidence for bulk superconductivity with a volume
fraction of $\sim 70\%$. The lower critical field is surprisingly small:
$B_{c1} = 0.008$ mT $(T \rightarrow 0)$. Muon spin rotation experiments in a
transverse magnetic field of 0.01 T show a weak increase of the Gaussian
damping rate $\sigma_{TF}$ below $T_c$, which yields a London penetration depth
$\lambda = 1.6 \pm 0.2~ \mu$m. The zero-field Kubo-Toyabe relaxation rate
$\sigma_{KT}$ equals $0.129 \pm 0.004~\mu$s$^{-1}$ and does not show a
significant change below $T_c$. This puts an upper bound of 0.04 mT on the
spontaneous magnetic field associated with a possible odd-parity component in
the superconducting order parameter.


title: How to deal with malleability of BitCoin transactions

abstract:
  BitCoin transactions are malleable in a sense that given a transaction an
adversary can easily construct an equivalent transaction which has a different
hash. This can pose a serious problem in some BitCoin distributed contracts in
which changing a transaction's hash may result in the protocol disruption and a
financial loss. The problem mostly concerns protocols, which use a "refund"
transaction to withdraw a deposit in a case of the protocol interruption. In
this short note, we show a general technique for creating
malleability-resilient "refund" transactions, which does not require any
modification of the BitCoin protocol. Applying our technique to our previous
paper "Fair Two-Party Computations via the BitCoin Deposits" (Cryptology ePrint
Archive, 2013) allows to achieve fairness in any Two-Party Computation using
the BitCoin protocol in its current version.


title:
Improved Reflection Models of Black-Hole Accretion Disks: Treating the
  Angular Distribution of X-rays

abstract:
  X-ray reflection models are used to constrain the properties of the accretion
disk, such as the degree of ionization of the gas and the elemental abundances.
In combination with general relativistic ray tracing codes, additional
parameters like the spin of the black hole and the inclination to the system
can be determined. However, current reflection models used for such studies
only provide angle-averaged solutions for the flux reflected at the surface of
the disk. Moreover, the emission angle of the photons changes over the disk due
to relativistic light bending. To overcome this simplification, we have
constructed the new angle-dependent reflection model RELXILL, by
self-consistently connecting the XILLVER reflection models with the
relativistic blurring code RELLINE.


title: An occupation time formula for semimartingales in $\mathbb{R}^{N}$

abstract:
  Inspired by coarea formula in geometric measure theory, an occupation time
formula for continuous semimartingales in $\mathbb{R}^{N}$ is proven. The
occupation measure of a semimartingale, for $N\geq2$, is singular with respect
to Lebesgue measure but it has a bounded density "transversal" to a foliation,
under proper assumptions. In the particular case of the foliation given locally
by the distance function from a manifold, the transversal density is related to
a geometric local time of the semimartingale at the manifolds of the foliation.


title:
A Comparison between Semi-Analytic Model Predictions for the CANDELS
  Survey

abstract:
  We compare the predictions of three independently developed semi-analytic
galaxy formation models that are being used to aid in the interpretation of
results from the CANDELS survey. These models are each applied to the same set
of halo merger trees extracted from the "Bolshoi" simulation and are carefully
tuned to match the local galaxy stellar mass function using the powerful method
of Bayesian Inference coupled with MCMC or by hand. The comparisons reveal that
in spite of the significantly different parameterizations for star formation
and feedback processes, the three models yield qualitatively similar
predictions for the assembly histories of galaxy stellar mass and star
formation over cosmic time. We show that the SAMs generally require strong
outflows to suppress star formation in low-mass halos to match the present day
stellar mass function. However, all of the models considered produce
predictions for the star formation rates and metallicities of low-mass galaxies
that are inconsistent with existing data and diverge between the models. We
suggest that large differences in the metallicity relations and small
differences in the stellar mass assembly histories of model galaxies stem from
different assumptions for the outflow mass-loading factor. Importantly, while
more accurate observational measurements for stellar mass, SFR and metallicity
of galaxies at 1<z<5 will discriminate between models, the discrepancies
between the models and existing data of these observables have already revealed
challenging problems in understanding star formation and its feedback in galaxy
formation. The three sets of models are being used to construct catalogs of
mock galaxies on light cones that have the same geometry as the CANDELS survey,
which should be particularly useful for quantifying the biases and
uncertainties on measurements and inferences from the real observations.
-ABRIDGED


title:
Communicability reveals a transition to coordinated behavior in
  multiplex networks

abstract:
  We analyse the flow of information in multiplex networks by means of the
communicability function. First, we generalize this measure from its definition
from simple graphs to multiplex networks. Then, we study its relevance for the
analysis of real-world systems by studying a social multiplex where information
flows using formal/informal channels and an air transportation system where the
layers represent different air companies. Accordingly, the communicability,
which is essential for the good performance of these complex systems, emerges
at a systemic operation point in the multiplex where the performance of the
layers operates in a coordinated way very differently from the state
represented by a collection of unconnected networks.


title: Electroweak and supersymmetry breaking from the Higgs discovery

abstract:
  We will explore the consequences on the electroweak breaking condition, the
mass of supersymmetric partners and the scale at which supersymmetry is broken,
for arbitrary values of the supersymmetric parameters tan(beta) and the stop
mixing X_t, which follow from the Higgs discovery with a mass m_H\simeq 126 GeV
at the LHC. Within the present uncertainty on the top quark mass we deduce that
radiative breaking requires tan(beta) \gtrsim 7 for maximal mixing X_t\simeq
\sqrt{6}, and tan(beta) \gtrsim 20 for small mixing X_t\lesssim 1. The scale at
which supersymmetry is broken \mathcal M can be of order the unification or
Planck scale only for large values of tan(beta) and negligible mixing X_t\simeq
0. On the other hand for maximal mixing and large values of tan(beta)
supersymmetry should break at scales as low as \mathcal M\simeq 10^5 GeV. The
uncertainty in those predictions stemming from the uncertainty in the top quark
mass, i.e. the top Yukawa coupling, is small (large) for large (small) values
of tan(beta). In fact for tan(beta)=1 the uncertainty on the value of \mathcal
M is of several orders of magnitude.


title:
The correspondence between mutually unbiased bases and mutually
  orthogonal extraordinary supersquares

abstract:
  We study the connection between mutually unbiased bases and mutually
orthogonal extraordinary supersquares, a wider class of squares which does not
contain only the Latin squares. We show that there are four types of complete
sets of mutually orthogonal extraordinary supersquares for the dimension $d=8$.
We introduce the concept of physical striation and show that this is equivalent
to the extraordinary supersquare. The general algorithm for obtaining the
mutually unbiased bases and the physical striations is constructed and it is
shown that the complete set of mutually unbiased physical striations is
equivalent to the complete set of mutually orthogonal extraordinary
supersquares. We apply the algorithm to two examples: one for two-qubit systems
($d=4$) and one for three-qubit systems ($d=8$), by using the Type II complete
sets of mutually orthogonal extraordinary supersquares of order 8.


title: Hecke algebras and involutions in Coxeter groups

abstract:
  Let $W$ be a Coxeter group and let $M$ be the free $Z[v,v^{-1}]$-module with
basis indexed by the involutions of $W$. We show how recent results of Elias
and Williamson on Soergel bimodules can be used to give an alternative
definition of an action of the Hecke algebra of $W$ on $M$.


title: Unzipping of DNA under the influence of external fields

abstract:
  We study the features on the unzipping process of a modified version of the
Peyrard-Bishop- Dauxois model. We show that the inclusion of a barrier in the
on-site potential allows for the existence of stable domain wall solutions
between open and closed regions of the DNA chain. We analyze the linear
stability of such solutions and study their relevance in the dynamical behavior
of DNA under ac forces.


title: Unitary Inequivalent Representations and Quantum Physics

abstract:
  In this paper we discuss the unitary inequivalentness in quantum physics.
Then based on some of the current outstanding problems in theoretical physics,
we will show the important role of this concept to better understand the
physical theories.


title:
Associative embeddings for large-scale knowledge transfer with
  self-assessment

abstract:
  We propose a method for knowledge transfer between semantically related
classes in ImageNet. By transferring knowledge from the images that have
bounding-box annotations to the others, our method is capable of automatically
populating ImageNet with many more bounding-boxes and even pixel-level
segmentations. The underlying assumption that objects from semantically related
classes look alike is formalized in our novel Associative Embedding (AE)
representation. AE recovers the latent low-dimensional space of appearance
variations among image windows. The dimensions of AE space tend to correspond
to aspects of window appearance (e.g. side view, close up, background). We
model the overlap of a window with an object using Gaussian Processes (GP)
regression, which spreads annotation smoothly through AE space. The
probabilistic nature of GP allows our method to perform self-assessment, i.e.
assigning a quality estimate to its own output. It enables trading off the
amount of returned annotations for their quality. A large scale experiment on
219 classes and 0.5 million images demonstrates that our method outperforms
state-of-the-art methods and baselines for both object localization and
segmentation. Using self-assessment we can automatically return bounding-box
annotations for 30% of all images with high localization accuracy (i.e.~73%
average overlap with ground-truth).


title: Trigonometric Parallaxes for 1,507 Nearby Mid-to-Late M-dwarfs

abstract:
  The MEarth survey is a search for small rocky planets around the smallest,
nearest stars to the Sun as identified by high proper motion with red colors.
We augmented our planetary search time series with lower cadence astrometric
imaging and obtained two million images of approximately 1800 stars suspected
to be mid-to-late M dwarfs. We fit an astrometric model to MEarth's images for
1507 stars and obtained trigonometric distance measurements to each star with
an average precision of 5 milliarcseconds. Our measurements, combined with the
2MASS photometry, allowed us to obtain an absolute K_s magnitude for each star.
In turn, this allows us to better estimate the stellar parameters than those
obtained with photometric estimates alone and to better prioritize the targets
chosen to monitor at high cadence for planetary transits. The MEarth sample is
mostly complete out to a distance of 25 parsecs for stars of type M5.5V and
earlier, and mostly complete for later type stars out to 20 parsecs. We find
eight stars that are within ten parsecs of the Sun for which there did not
exist a published trigonometric parallax distance estimate. We release with
this work a catalog of the trigonometric parallax measurements for 1,507
mid-to-late M-dwarfs, as well as new estimates of their masses and radii.


title: Integrals of convex functions in the gradients on fractals

abstract:
  In this paper, I describe the construction of certain functional integrals in
the gradient on finitely ramified fractals, which have a sort of
self-similarity property.


title: Higher-order resonances and instability of high-frequency WKB solutions

abstract:
  This paper focuses on the destabilizing role of resonances in high-frequency
WKB solutions. Specifically, we study higher-order resonances associated with
higher-order harmonics generated by nonlinearities. We give examples of systems
and solutions for which such resonances generate instantaneous instabilities,
even though the equations linearized around the leading WKB terms are initially
stable, meaning in particular that the key destabilizing terms are not present
in the data.


title: Chiral density wave in nuclear matter

abstract:
  Inspired by recent work on inhomogeneous chiral condensation in cold, dense
quark matter within models featuring quark degrees of freedom, we investigate
the chiral density-wave solution in nu- clear matter at zero temperature and
nonvanishing baryon number density in the framework of the so-called extended
linear sigma model (eLSM). The eLSM is an effective model for the strong
interaction based on the global chiral symmetry of quantum chromodynamics
(QCD). It contains scalar, pseudoscalar, vector, and axial-vector mesons as
well as baryons. In the latter sector, the nucleon and its chiral partner are
introduced as parity doublets in the mirror assignment. The eLSM simultaneously
provides a good description of hadrons in vacuum as well as nuclear matter
ground-state properties. We find that an inhomogeneous phase in the form of a
chiral density wave is realized, but only for densities larger than 2.4
{\rho}0, where {\rho}0 is the nuclear matter ground-state density.


title:
The Company You Keep: Mobile Malware Infection Rates and Inexpensive
  Risk Indicators

abstract:
  There is little information from independent sources in the public domain
about mobile malware infection rates. The only previous independent estimate
(0.0009%) [12], was based on indirect measurements obtained from domain name
resolution traces. In this paper, we present the first independent study of
malware infection rates and associated risk factors using data collected
directly from over 55,000 Android devices. We find that the malware infection
rates in Android devices estimated using two malware datasets (0.28% and
0.26%), though small, are significantly higher than the previous independent
estimate. Using our datasets, we investigate how indicators extracted
inexpensively from the devices correlate with malware infection. Based on the
hypothesis that some application stores have a greater density of malicious
applications and that advertising within applications and cross-promotional
deals may act as infection vectors, we investigate whether the set of
applications used on a device can serve as an indicator for infection of that
device. Our analysis indicates that this alone is not an accurate indicator for
pinpointing infection. However, it is a very inexpensive but surprisingly
useful way for significantly narrowing down the pool of devices on which
expensive monitoring and analysis mechanisms must be deployed. Using our two
malware datasets we show that this indicator performs 4.8 and 4.6 times
(respectively) better at identifying infected devices than the baseline of
random checks. Such indicators can be used, for example, in the search for new
or previously undetected malware. It is therefore a technique that can
complement standard malware scanning by anti-malware tools. Our analysis also
demonstrates a marginally significant difference in battery use between
infected and clean devices.


title: A first look at Bottomonium melting via a stochastic potential

abstract:
  We investigate the phenomenon of Bottomonium melting in a thermal quark-gluon
plasma using three-dimensional stochastic simulations based on the concept of
open-quantum systems. In this non-relativistic framework, introduced in
[Phys.Rev. D85 (2012) 105011], which makes close contact to the potentials
derived in effective field theory, the $b\bar{b}$ system evolves unitarily
under the incessant kicks by the constituents of the surrounding heat bath. In
particular thermal fluctuations and the presence of a complex potential in the
EFT are naturally related. An intricate interplay between state mixing and
thermal excitations emerges as we show how non-thermal initial conditions of
Bottomonium states evolve over time. We emphasize that the dynamics of these
states gives us access to information beyond what is encoded in the thermal
Bottomonium spectral functions. Assumptions underlying our approach and their
limitations, as well as the refinements necessary to connect to experimental
measurements under more realistic conditions are discussed.


title: Emergent quantum mechanics of finances

abstract:
  This paper is an attempt at understanding the quantum-like dynamics of
financial markets in terms of non-differentiable price-time continuum having
fractal properties. The main steps of this development are the statistical
scaling, the non-differentiability hypothesis, and the equations of motion
entailed by this hypothesis. From perspective of the proposed theory the
dynamics of S&P500 index are analyzed.


title: On the Complexity of Mining Itemsets from the Crowd Using Taxonomies

abstract:
  We study the problem of frequent itemset mining in domains where data is not
recorded in a conventional database but only exists in human knowledge. We
provide examples of such scenarios, and present a crowdsourcing model for them.
The model uses the crowd as an oracle to find out whether an itemset is
frequent or not, and relies on a known taxonomy of the item domain to guide the
search for frequent itemsets. In the spirit of data mining with oracles, we
analyze the complexity of this problem in terms of (i) crowd complexity, that
measures the number of crowd questions required to identify the frequent
itemsets; and (ii) computational complexity, that measures the computational
effort required to choose the questions. We provide lower and upper complexity
bounds in terms of the size and structure of the input taxonomy, as well as the
size of a concise description of the output itemsets. We also provide
constructive algorithms that achieve the upper bounds, and consider more
efficient variants for practical situations.


title: Spectral stellar libraries and the Virtual Observatory

abstract:
  This paper describes the main characteristics of the Virtual Observatory as a
research infrastructure in Astronomy, and identifies those fields in which it
can be of help for the community of spectral stellar libraries.


title:
Acceleration of raindrops formation due to tangling-clustering
  instability in turbulent stratified atmosphere

abstract:
  Condensation of water vapor on active cloud condensation nuclei produces
micron-size water droplets. To form rain, they must grow rapidly into at least
50-100 $\mu$m droplets. Observations show that this process takes only 15-20
minutes. The unexplained physical mechanism of such fast growth, is crucial for
understanding and modeling of rain, and known as "condensation-coalescence
bottleneck in rain formation". We show that the recently discovered phenomenon
of the tangling clustering instability of small droplets in
temperature-stratified turbulence (Phys. Fluids 25, 085104, 2013) results in
the formation of droplet clusters with drastically increased droplet number
densities. The mechanism of the tangling clustering instability is much more
effective than the previously considered by us the inertial clustering
instability caused by the centrifugal effect of turbulent vortices. This is the
reason of strong enhancement of the collision-coalescence rate inside the
clusters. The mean-field theory of the droplet growth developed in this study
can be useful for explanation of the observed fast growth of cloud droplets in
warm clouds from the initial 1 micron size droplets to 40-50 micron size
droplets within 15-20 minutes.


title: Towards The Development of a Bishnupriya Manipuri Corpus

abstract:
  For any deep computational processing of language we need evidences, and one
such set of evidences is corpus. This paper describes the development of a
text-based corpus for the Bishnupriya Manipuri language. A Corpus is considered
as a building block for any language processing tasks. Due to the lack of
awareness like other Indian languages, it is also studied less frequently. As a
result the language still lacks a good corpus and basic language processing
tools. As per our knowledge this is the first effort to develop a corpus for
Bishnupriya Manipuri language.


title:
Electroweak $ZZjj$ production in the Standard Model and beyond in the
  POWHEG-BOX V2

abstract:
  We present an implementation of electroweak $ZZjj$ production in the POWHEG
BOX V2 framework, an upgrade of the POWHEG BOX program which includes a number
of new features that are particularly helpful for high-multiplicity processes.
We consider leptonic and semi-leptonic decay modes of the Z bosons, and take
non-resonant contributions and spin correlations of the final-state particles
into account. In the case of decays to leptons, we also include interactions
beyond the Standard Model that arise from an effective Lagrangian which
includes CP conserving and violating operators up to dimension six. We find
that while leptonic distributions are very sensitive to anomalous couplings,
because of the small cross-section involved, these analyses are feasible only
after a high-luminosity upgrade of the LHC. We consider the cases of a 14 TeV,
33 TeV and 100 TeV machine and discuss the limits that can be placed on those
couplings for different luminosities.


title: General Relativity from a Thermodynamic Perspective

abstract:
  I show that the gravitational dynamics in a bulk region of space can be
connected to a thermodynamic description in the boundary of that region,
thereby providing clear physical interpretations of several mathematical
features of classical general relativity: (1) The Noether charge contained in a
bulk region, associated with a specific time evolution vector field, has a
direct thermodynamic interpretation as the gravitational heat content of the
boundary surface. (2) This result, in turn, shows that all static spacetimes
maintain holographic equipartition; in these spacetimes, the number of degrees
of freedom in the boundary is equal to the number of degrees of freedom in the
bulk. (3) In a general, evolving spacetime, the rate of change of gravitational
momentum is related to the difference between the number of bulk and boundary
degrees of freedom. It is this departure from the holographic equipartition
which drives the time evolution of the spacetime. (4) When the equations of
motion hold, the (naturally defined) total energy of the gravity plus matter
within a bulk region, will be equal to the boundary heat content. (5) After
motivating the need for an alternate description of gravity (if we have to
solve the cosmological constant problem), I describe a thermodynamic
variational principle based on null surfaces to achieve this goal. The concept
of gravitational heat density of the null surfaces arises naturally from the
Noether charge associated with the null congruence. The null surface
variational principle, in fact, extremises the total heat content of the matter
plus gravity system. Several variations on this theme and implications are
described. [Abridged]


title: Composite systems in magnetic field: from hadrons to hydrogen atom

abstract:
  We briefly review the recent studies of the behavior of composite systems in
magnetic field. The hydrogen atom is chosen to demonstrate the new results
which may be experimentally tested. Possible applications to physics of
antihydrogen are mentioned.


title: The maximum product of sizes of cross-$t$-intersecting uniform families

abstract:
  We say that a set $A$ \emph{$t$-intersects} a set $B$ if $A$ and $B$ have at
least $t$ common elements. Two families $\mathcal{A}$ and $\mathcal{B}$ are
said to be \emph{cross-$t$-intersecting} if each set in $\mathcal{A}$
$t$-intersects each set in $\mathcal{B}$. For any positive integers $n$ and
$r$, let ${[n] \choose r}$ denote the family of all $r$-element subsets of
$\{1,2,\dots, n\}$. We show that for any integers $r$, $s$ and $t$ with $1 \leq
t \leq r \leq s$, there exists an integer $n_0(r,s,t)$ such that for any
integer $n \geq n_0(r,s,t)$, if $\mathcal{A} \subset {[n] \choose r}$ and
$\mathcal{B} \subset {[n] \choose s}$ such that $\mathcal{A}$ and $\mathcal{B}$
are cross-$t$-intersecting, then $|\mathcal{A}||\mathcal{B}| \leq {n-t \choose
r-t}{n-t \choose s-t}$, and equality holds if and only if for some $T \in {[n]
\choose t}$, $\mathcal{A} = \{A \in {[n] \choose r} \colon T \subset A\}$ and
$\mathcal{B} = \{B \in {[n] \choose s} \colon T \subset B\}$. This verifies a
conjecture of Hirschorn.


title:
Approximation by normal distribution for a sample sum in sampling
  without replacement from a finite population

abstract:
  A sum of observations derived by a simple random sampling design from a
population of independent random variables is studied. A procedure finding a
general term of Edgeworth asymptotic expansion is presented. The Lindeberg
condition of asymptotic normality, Berry-Esseen bound, Edgeworth asymptotic
expansions under weakened conditions and Cramer type large deviation results
are derived.


title: A new angular momentum method for computing wave maps into spheres

abstract:
  In this paper, we present and analyze a new finite difference method for
computing three dimensional wave maps into spheres. By introducing the angular
momentum as an auxiliary variable, we recast the governing equation as a first
order system. For this new system, we propose a discretization that conserves
both the energy and the length constraint. The new method is also fast
requiring only $N\log N$ operations at each time step. Our main result is that
the method converges to a weak solution as discretization parameters go to
zero. The paper is concluded by numerical experiments demonstrating convergence
of the method and its ability to predict finite time blow-up.


title:
Implicit Sensitive Text Summarization based on Data Conveyed by
  Connectives

abstract:
  So far and trying to reach human capabilities, research in automatic
summarization has been based on hypothesis that are both enabling and limiting.
Some of these limitations are: how to take into account and reflect (in the
generated summary) the implicit information conveyed in the text, the author
intention, the reader intention, the context influence, the general world
knowledge. Thus, if we want machines to mimic human abilities, then they will
need access to this same large variety of knowledge. The implicit is affecting
the orientation and the argumentation of the text and consequently its summary.
Most of Text Summarizers (TS) are processing as compressing the initial data
and they necessarily suffer from information loss. TS are focusing on features
of the text only, not on what the author intended or why the reader is reading
the text. In this paper, we address this problem and we present a system
focusing on acquiring knowledge that is implicit. We principally spotlight the
implicit information conveyed by the argumentative connectives such as: but,
even, yet and their effect on the summary.


title: Radiation pressure and the linear momentum of the electromagnetic field

abstract:
  We derive the force of the electromagnetic radiation on material objects by a
direct application of the Lorentz law of classical electro-dynamics. The
derivation is straightforward in the case of solid metals and solid
dielectrics, where the mass density and the optical constants of the media are
assumed to remain unchanged under internal and external pressures, and where
material flow and deformation can be ignored. For metallic mirrors, we separate
the contribution to the radiation pressure of the electrical charge density
from that of the current density of the conduction electrons. In the case of
dielectric media, we examine the forces experienced by bound charges and
currents, and determine the contribution of each to the radiation pressure.
These analyses reveal the existence of a lateral radiation pressure inside the
dielectric media, one that is exerted at and around the edges of a
finite-diameter light beam. The lateral pressure turns out to be compressive
for s-polarized light and expansive for p-polarized light. Along the way, we
derive an expression for the momentum density of the light field inside
dielectric media, one that has equal contributions from the traditional
Minkowski and Abraham forms. This new expression for the momentum density,
which contains both electromagnetic and mechanical terms, is used to explain
the behavior of light pulses and individual photons upon entering and exiting a
dielectric slab. In all the cases considered, the net forces and torques
experienced by material bodies are consistent with the relevant conservation
laws. Our method of calculating the radiation pressure can be used in
conjunction with numerical simulations to yield the distribution of fields and
forces in diverse systems of practical interest.


title:
The Foundations of Genodynamics: The Development of Metrics for
  Genomic-Environmental Interactions

abstract:
  Single nucleotide polymorphisms (SNPs) represent an important type of dynamic
sites within the human genome. These common variants often locally correlate
into more complex multi-SNP haploblocks that are maintained throughout
generations in a stable population. The information encoded in the structure of
common SNPs and SNP haploblock variation can be characterized through a
normalized information content (NIC) metric. Such an intrinsic measure allows
disparate regions of individual genomes and the genomes of various populations
to be quantitatively compared in a meaningful way.
  Using our defined measures of genomic information, the interplay of
maintained statistical variations due to the environmental baths within which
stable populations exist can be interrogated. We develop the analogous
"thermodynamics" characterizing the state variables for genomic populations
that are stable under stochastic environmental stresses. Since living systems
have not been found to develop in the absence of environmental influences, we
focus on describing the analogous genomic free energy measures in this
development.
  The intensive parameter describing how an environment drives genomic
diversity is found to depend inversely upon the NIC of the genome of a stable
population within that environment. Once this environmental potential has been
determined from the whole genome of a population, additive state variables can
be directly related to the probabilities of the occurrence of given viable SNP
based units (alleles) within that genome. This formulation allows the
determination of both population averaged state variables as well as the
genomic energies of individual alleles and their combinations. The
determination of individual allelic potentials then should allow the
parameterization of specific environmental influences upon shared alleles
across populations in varying environments.


title:
Semiclassical pair production rate for time-dependent electrical fields
  with more than one component: -WKB-approach and world-line instantons

abstract:
  We present an analytic calculation of the semiclassical electron-positron
pair creation rate by time-dependent electrical fields. We use two methods,
first the imaginary time method in the WKB-approximation and second the
world-line instanton approach. The analytic tools for both methods are
generalized to time-dependent electric fields with more than one component. For
the WKB method an expansion of the momentum spectrum of produced pairs around
the canonical momentum $\vec{P}=0$ is presented which simplifies the
computation of the pair creation rate. We argue that the world-line instanton
method of [Dunne et al., Phys. Rev. D73, 065028 (2006)] implicitly performs
this expansion of the momentum spectrum around $\vec{P}=0$. Accordingly the
generalization to more than one component is shown to agree with the WKB result
obtained via this expansion. However the expansion is only a good approximation
for the cases where the momentum spectrum is peaked around $\vec{P}=0$. Thus
the expanded WKB result and the world-line instanton method of [Dunne et al.,
Phys. Rev. D73, 065028 (2006)] as well as the generalized method presented here
are only applicable in these cases. We study the two component case of a
rotating electric field and find a new analytic closed form for the momentum
spectrum using the generalized WKB method. The momentum spectrum for this field
is not peaked around $\vec{P}=0$.


title:
The Force Law of Classical Electrodynamics: Lorentz versus Einstein and
  Laub

abstract:
  The classical theory of electrodynamics is built upon Maxwell's equations and
the concepts of electromagnetic field, force, energy, and momentum, which are
intimately tied together by Poynting's theorem and the Lorentz force law.
Whereas Maxwell's macroscopic equations relate the electric and magnetic fields
to their material sources (i.e., charge, current, polarization and
magnetization), Poynting's theorem governs the flow of electromagnetic energy
and its exchange between fields and material media, while the Lorentz law
regulates the back-and-forth transfer of momentum between the media and the
fields. As it turns out, an alternative force law, first proposed in 1908 by
Einstein and Laub, exists that is consistent with Maxwell's macroscopic
equations and complies with the conservation laws as well as with the
requirements of special relativity. While the Lorentz law requires the
introduction of hidden energy and hidden momentum in situations where an
electric field acts on a magnetic material, the Einstein-Laub formulation of
electromagnetic force and torque does not invoke hidden entities under such
circumstances. Moreover, the total force and the total torque exerted by
electromagnetic fields on any given object turn out to be independent of
whether force and torque densities are evaluated using the Lorentz law or in
accordance with the Einstein-Laub formulas. Hidden entities aside, the two
formulations differ only in their predicted force and torque distributions
throughout material media. Such differences in distribution are occasionally
measurable, and could serve as a guide in deciding which formulation, if
either, corresponds to physical reality.


title: Stable Embedding of Grassmann Manifold via Gaussian Random matrices

abstract:
  In this paper, we explore a volume-based stable embedding of
multi-dimensional signals based on Grassmann manifold, via Gaussian random
measurement matrices. The Grassmann manifold is a topological space in which
each point is a linear vector subspace, and is widely regarded as an ideal
model for multi-dimensional signals. In this paper, we formulate the linear
subspace spanned by multi-dimensional signal vectors as points on the Grassmann
manifold, and use the volume and the product of sines of principal angles (also
known as the product of principal sines) as the generalized norm and distance
measure for the space of Grassmann manifold. We prove a volume-preserving
embedding property for points on the Grassmann manifold via Gaussian random
measurement matrices, i.e., the volumes of all parallelotopes from a finite set
in Grassmann manifold are preserved upon compression. This volume-preserving
embedding property is a multi-dimensional generalization of the conventional
stable embedding properties, which only concern the approximate preservation of
lengths of vectors in certain unions of subspaces. Additionally, we use the
volume-preserving embedding property to explore the stable embedding effect on
a generalized distance measure of Grassmann manifold induced from volume. It is
proved that the generalized distance measure, i.e., the product of principal
sines between different points on the Grassmann manifold, is well preserved in
the compressed domain via Gaussian random measurement matrices.Numerical
simulations are also provided for validation.


title:
Two-dimensional nonlinear travelling waves in magnetohydrodynamic
  channel flow

abstract:
  The present study is concerned with the stability of a flow of viscous
conducting liquid driven by pressure gradient in the channel between two
parallel walls subject to a transverse magnetic field. Although the magnetic
field has a strong stabilizing effect, this flow, similarly to its hydrodynamic
counterpart -- plane Poiseuille flow, is known to become turbulent
significantly below the threshold predicted by linear stability theory. We
investigate the effect of the magnetic field on 2D nonlinear travelling-wave
states which are found at substantially subcritical Reynolds numbers starting
from $Re_n=2939$ without the magnetic field and from $Re_n\sim6.50\times10^3Ha$
in a sufficiently strong magnetic field defined by the Hartmann number $Ha.$
Although the latter value is by a factor of seven lower than the linear
stability threshold $Re_l\sim4.83\times10^4Ha$,it is still more by an order of
magnitude higher than the experimentally observed value for the onset of
turbulence in the MHD channel flow.


title: Computational efficiency of staggered Wilson fermions: A first look

abstract:
  Results on the computational efficiency of 2-flavor staggered Wilson fermions
compared to usual Wilson fermions in a quenched lattice QCD simulation on
$16^3\times32$ lattice at $\beta=6$ are reported. We compare the cost of
inverting the Dirac matrix on a source by the conjugate gradient (CG) method
for both of these fermion formulations, at the same pion masses, and without
preconditioning. We find that the number of CG iterations required for
convergence, averaged over the ensemble, is less by a factor of almost 2 for
staggered Wilson fermions, with only a mild dependence on the pion mass. We
also compute the condition number of the fermion matrix and find that it is
less by a factor of 4 for staggered Wilson fermions. The cost per CG iteration,
dominated by the cost of matrix-vector multiplication for the Dirac matrix, is
known from previous work to be less by a factor 2-3 for staggered Wilson
compared to usual Wilson fermions. Thus we conclude that staggered Wilson
fermions are 4-6 times cheaper for inverting the Dirac matrix on a source in
the quenched backgrounds of our study.


title:
Small Perturbations and Infinitesimal Deformations on Surfaces of
  Revolution

abstract:
  Any given surface of revolution embedded in Euclidean three-space can always
be perturbed by arbitrarily small ambient isotopies as to admit highly
nontrivial vector fields inducing infinitesimal deformations. For this matter
Morse Theory is used, clarifying and giving a general response of a problem
started with an idea of M. Spivak.


title: Radiation Pressure and Photon Momentum in Negative-Index Media

abstract:
  Radiation pressure and photon momentum in negative-index media are no
different than their counterparts in ordinary (positive-index) materials. This
is because the parameters responsible for these properties are the admittance,
sqrt(epsilon/mu), and the group refractive index n_g of the material (both
positive entities), and not the phase refractive index, n=sqrt(epsilon*mu),
which is negative in negative-index media. One approach to investigating the
exchange of momentum between electromagnetic waves and material media is via
the Doppler shift phenomenon. In this paper we use the Doppler shift to arrive
at an expression for the radiation pressure on a mirror submerged in a
negative-index medium. In preparation for the analysis, we investigate the
phenomenon of Doppler shift in various settings, and show the conditions under
which a so-called "inverse" Doppler shift could occur. We also argue that a
recent observation of the inverse Doppler shift upon reflection from a
negative-index medium cannot be correct, because it violates the conservation
laws.