title: Masses of the components of the HDE 226868/Cyg X-1 binary system

abstract:
  Recent determination of the distance to HDE 226868/Cyg X-1 binary system
(Reid et al., 2011) and more precise determination of the effective temperature
of HDE 226868 (Caballero- Nieves et al., 2009) permit a more accurate estimate
of the masses of both components. Using up to date evolutionary models, I
obtain a mass range of between 25 to 35 Msun for the mass of the supergiant and
between 13 to 23 Msun for the mass of the black hole. Accepting more liberal
estimates of uncertainties in both the distance and the effective temperature,
one may extend these ranges to 21 to 35 Msun and 10 to 23 Msun for both masses,
respectively. The most likely values within these ranges are, respectively, 27
Msun and 16 Msun. The obtained mass of black hole agrees with the value 15 +- 1
Msun suggested by Orosz et al. (2011). However, the value suggested by them for
the mass of the supergiant of 19 +- 2 Msun should not be used as such a star
violates the mass-luminosity relation for the the massive core hydrogen burning
stars. This consideration was not incorporated into the iterative process of
Orosz et al. To resolve this violation I consider the possibility that the
hydrogen content of HDE 222268 might be lowered as a result of the mass
transfer and the induced fast rotation of the mass gainer. I analyzed the
evolutionary effects of such situation and found that, while important, they do
not invalidate the conclusions listed above. If, as a result of the rotation
induced mixing, the present hydrogen content of HDE 226868 is equal about 0.6
(as suggested by some observational data), then its present mass may be
somewhat lower: about 24 Msun rather than about 27 Msun.


title:
Vertex-reinforced random walk on Z with sub-square-root weights is
  recurrent

abstract:
  We prove that vertex-reinforced random walk on the integers with weight of
order k to the power alpha, for alpha in [0, 1/2), is recurrent. This confirms
a conjecture of Volkov for alpha<1/2. The conjecture for alpha in [1/2, 1)
remains open.


title:
Topological group cohomology of Lie groups and Chern-Weil theory for
  compact symmetric spaces

abstract:
  In this paper we analyse the topological group cohomology of
finite-dimensional Lie groups. We introduce a technique for computing it (as
abelian groups) for torus coefficients by the naturally associated long exact
sequence. The upshot in there is that certain morphisms in this long exact
coefficient sequence can be accessed (at least for semi-simple Lie groups) very
conveniently by the Chern-Weil homomorphism of the naturally associated compact
dual symmetric space. Since the latter is very well-known, this gives the
possibility to compute the topological group cohomology of the classical simple
Lie groups. In addition, we establish a relation to characteristic classes of
flat bundles.


title:
How nonlinear interactions challenge the three-dimensional Anderson
  transition

abstract:
  In disordered systems, our present understanding of the Anderson transition
is hampered by the possible presence of interactions between particles. We
demonstrate that in boson gases, even weak interactions deeply alter the very
nature of the Anderson transition. While there still exists a critical point in
the system, below that point a novel phase appears, displaying a new critical
exponent, subdiffusive transport and a breakdown of the one-parameter scaling
description of Anderson localization.


title: Extending Smooth Cyclic Group Actions on the Poincare Homology Sphere

abstract:
  Let $X_0$ denote a compact, simply-connected smooth $4$-manifold with
boundary the Poincar\'e homology $3$-sphere $\Sigma(2,3,5)$ and with even
negative definite intersection form $Q_{X_0}=E_8$. We show that free
$\mathbb{Z}/p$ actions on $\Sigma(2,3,5)$ do not extend to smooth actions on
$X_0$ with isolated fixed points for any prime $p>7$. The approach is to study
the equivariant version of the Yang-Mills instanton-one moduli space for
$4$-manifolds with cylindrical ends. As an application we show that for $p>7$ a
smooth $\mathbb{Z}/p$ action on $\#^8 S^2 \times S^2$ with isolated fixed
points does not split along a free action on $\Sigma(2,3,5)$. The results hold
for $p=7$ if the action is homologically trivial.


title:
Constraints on the outer radius of the broad emission line region of
  active galactic nuclei

abstract:
  Here we present observational evidence that the broad emission line region
(BELR) of active galactic nuclei (AGN) generally has an outer boundary. This
was already clear for sources with an obvious transition between the broad and
narrow components of their emission lines. We show that the narrow component of
the higher-order Paschen lines is absent in all sources, revealing a broad
emission line profile with a broad, flat top. This indicates that the BELR is
kinematically separate from the narrow emission line region. We use the virial
theorem to estimate the BELR outer radius from the flat top width of the
unblended profiles of the strongest Paschen lines, Pa alpha and Pa beta, and
find that it scales with the ionising continuum luminosity roughly as expected
from photoionisation theory. The value of the incident continuum photon flux
resulting from this relationship corresponds to that required for dust
sublimation. A flat-topped broad emission line profile is produced by both a
spherical gas distribution in orbital motion as well as an accretion disc wind
if the ratio between the BELR outer and inner radius is assumed to be less than
~100 - 200. On the other hand, a pure Keplerian disc can be largely excluded,
since for most orientations and radial extents of the disc the emission line
profile is double-horned.


title:
Volume dependence of the Gr\"uneisen ratio for shock-wave
  equation-of-state studies

abstract:
  This work presents an analysis of the existing self-contained expressions for
the volume dependence of the Gr\"uneisen ratio $\gamma$ in view of their
further application to EOS (equation of state) studies. These expressions are
assessed and applied to materials with the major types of chemical bonds.
Predictions from regression analysis are compared to existing experimental data
sets. All expressions predict with very good accuracy the values of $\gamma$ at
ambient conditions, its volume variation in the low pressure region, but fail
to give correct values for its infinite compression limit. A possible reason
for this is that all experiments are performed at comparatively low pressures.
The interpolation formula by Al'tshuler et al. (1987) and the equation,
proposed by Jeanloz (1989) are the best fit to experimental data. A
modification to Jeanloz's equation, more convenient for use in shock physics,
is proposed in the present work. It could be used jointly with the shock
Hugoniot to derive a complete EOS for solids from their response to shock-wave
loading.


title:
An experimental apparatus for study of direct {\beta}-radiation
  conversion for energy harvesting

abstract:
  This paper introduces the development and testing of an experimental
apparatus for characterization of a direct charging nuclear battery. The
battery consists of a parallel-plates capacitor which is charged in a vacuum by
the current of {\beta}-radiation particles (electrons) emitted from a
radioisotope. A 63Ni radioisotope with an activity of 15mCi that produces a
20pA current was selected as the radiation source. The apparatus is unique in
its design, having ultra-low leakage current and a few options for charge
measurements. Preliminary results of a few tests are presented to demonstrate
the capabilities of the apparatus.


title: Discovering Compressing Serial Episodes from Event Sequences

abstract:
  Most pattern mining methods output a very large number of frequent patterns
and isolating a small but relevant subset is a challenging problem of current
interest in frequent pattern mining. In this paper we consider discovery of a
small set of relevant frequent episodes from data sequences. We make use of the
Minimum Description Length principle to formulate the problem of selecting a
subset of episodes. Using an interesting class of serial episodes with
inter-event constraints and a novel encoding scheme for data using such
episodes, we present algorithms for discovering small set of episodes that
achieve good data compression. Using an example of the data streams obtained
from distributed sensors in a composable coupled conveyor system, we show that
our method is very effective in unearthing highly relevant episodes and that
our scheme also achieves good data compression.


title: Derived Algebraic Geometry

abstract:
  This text is a survey of derived algebraic geometry. It covers a variety of
general notions and results from the subject with a view on the recent
developments at the interface with deformation quantization.


title:
Cosmological matching conditions and galilean genesis in Horndeski's
  theory

abstract:
  We derive the cosmological matching conditions for the homogeneous and
isotropic background and for linear perturbations in Horndeski's most general
second-order scalar-tensor theory. In general relativity, the matching is done
in such a way that the extrinsic curvature is continuous across the transition
hypersurface. This procedure is generalized so as to incorporate the mixing of
scalar and gravity kinetic terms in the field equations of Horndeski's theory.
Our matching conditions have a wide range of applications including the
galilean genesis and the bounce scenarios, in which stable, null energy
condition violating solutions play a central role. We demonstrate how our
matching conditions are used in the galilean genesis scenario. In doing so, we
extend the previous genesis models and provide a unified description of the
theory admitting the solution that starts expanding from the Minkowski
spacetime.


title:
Asymptotic estimates of viscoelastic Green's functions near the
  wavefront

abstract:
  Asymptotic behavior of viscoelastic Green's functions near the wavefront is
expressed in terms of a causal function $g(t)$ defined in \cite{SerHanJMP} in
connection with the Kramers-Kronig dispersion relations. Viscoelastic Green's
functions exhibit a discontinuity at the wavefront if $g(0) < \infty$.
Estimates of continuous and discontinuous viscoelastic Green's functions near
the wavefront are obtained.


title: The Moduli of Singular Curves on K3 Surfaces

abstract:
  In this article we consider moduli properties of singular curves on K3
surfaces. Let $\mathcal{B}_g$ denote the stack of primitively polarized K3
surfaces $(X,L)$ of genus $g$ and let $\mathcal{T}^n_{g,k} \to \mathcal{B}_g$
be the stack parametrizing tuples $[(f: C \to X, L)]$ with $f$ an unramified
morphism which is birational onto its image, $C$ a smooth curve of genus
$p(g,k)-n$ and $f_*C \in |kL|$. We show that the forgetful morphism $$\eta \; :
\; \mathcal{T}^n_{g,k} \to \mathcal{M}_{p(g,k)-n}$$ is generically finite on
one component, for all but finitely many values of $p(g,k)-n$. We further study
the Brill--Noether theory of those curves parametrized by the image of $\eta$,
and find a Wahl-type obstruction for a smooth curve with an unordered marking
to have a nodal model on a K3 surface in such a way that the marking is the
divisor over the nodes.


title:
The empirical Monod-Beuneu relation of spin-relaxation revisited for
  elemental metals

abstract:
  Monod and Beuneu [Monod and Beuneu, Phys. Rev. B 19, 911 (1979)] established
the validity of the Elliott-Yafet theory for elemental metals through
correlating the experimental electron spin resonance line-width with the
so-called spin-orbit admixture coefficients and the momentum-relaxation theory.
The spin-orbit admixture coefficients data were based on atomic spin-orbit
splitting. We highlight two shortcomings of the previous description: i) the
momentum-relaxation involves the Debye temperature and the electron-phonon
coupling whose variation among the elemental metals was neglected, ii) the
Elliott-Yafet theory involves matrix elements of the spin-orbit coupling (SOC),
which are however not identical to the SOC induced energy splitting of the
atomic levels, even though the two have similar magnitudes. We obtain the
empirical spin-orbit admixture parameters for the alkali metals by considering
the proper description of the momentum relaxation theory. In addition, we
present a model calculation which highlights the difference between the SOC
matrix element and energy splitting.


title: On the semiprime smash product question

abstract:
  This is a survey article on a question, posed in 1986 by M.Cohen and
D.Fishman, whether the smash product $A\#H$ of a semisimple Hopf algebra and a
semiprime left $H$-module algebra $A$ is itself semiprime.


title: Universality theorems for linkages in the Minkowski plane

abstract:
  A mechanical linkage is a mechanism made of rigid rods linked together by
flexible joints, in which some vertices are fixed and others may move. The
partial configuration space of a linkage is the set of all the possible
positions of a subset of the vertices. We characterize the possible partial
configuration spaces of linkages in the Minkowski plane. We also give a proof
of a differential universality theorem in the Minkowski plane: for any manifold
M which is the interior of a compact manifold with boundary, there is a linkage
which has a configuration space diffeomorphic to the disjoint union of a finite
number of copies of M.


title:
Action Minimizing Solutions of The One-Dimensional $N$-Body Problem With
  Equal Masses

abstract:
  When we use variational methods to study the Newtonian $N$-body problem, the
main problem is how to avoid collisions. C.Marchal got a remarkable result,
that is, a path minimizing the Lagrangian action functional between two given
configurations is always a true (collision-free) solution, so long as the
dimension $d$ of physical space $\mathbb{R}^d$ satisfies $d\geq2$. But
Marchal's idea can't apply to the case of the one-dimensional physical space.
In this paper, we will study the fixed-ends problem for the one-dimensional
Newtonian $N$-body problem with equal masses to supplement Marchal's result.
More precisely, we first get the isolated property of collision moments for a
path minimizing the action functional between two given configurations, then,
if the particles at two endpoints have the same order, the path minimizing the
action functional is always a true (collision-free) solution; otherwise,
although there must be collisions for any path, we can prove that there are at
most $N! - 1$ collisions for any action minimizing path.


title:
Inverse Bayesian Estimation of Gravitational Mass Density in Galaxies
  from Missing Kinematic Data

abstract:
  In this paper we focus on a type of inverse problem in which the data is
expressed as an unknown function of the sought and unknown model function (or
its discretised representation as a model parameter vector). In particular, we
deal with situations in which training data is not available. Then we cannot
model the unknown functional relationship between data and the unknown model
function (or parameter vector) with a Gaussian Process of appropriate
dimensionality. A Bayesian method based on state space modelling is advanced
instead. Within this framework, the likelihood is expressed in terms of the
probability density function ($pdf$) of the state space variable and the sought
model parameter vector is embedded within the domain of this $pdf$. As the
measurable vector lives only inside an identified sub-volume of the system
state space, the $pdf$ of the state space variable is projected onto the space
of the measurables, and it is in terms of the projected state space density
that the likelihood is written; the final form of the likelihood is achieved
after convolution with the distribution of measurement errors. Application
motivated vague priors are invoked and the posterior probability density of the
model parameter vectors, given the data is computed. Inference is performed by
taking posterior samples with adaptive MCMC. The method is illustrated on
synthetic as well as real galactic data.


title:
Terminal semantics for codata types in intensional Martin-L\"of type
  theory

abstract:
  In this work, we study the notions of relative comonad and comodule over a
relative comonad, and use these notions to give a terminal coalgebra semantics
for the coinductive type families of streams and of infinite triangular
matrices, respectively, in intensional Martin-L\"of type theory. Our results
are mechanized in the proof assistant Coq.


title: A method to deconvolve stellar rotational velocities

abstract:
  Rotational speed is an important physical parameter of stars and knowing the
distribution of stellar rotational velocities is essential for the
understanding stellar evolution. However, it cannot be measured directly but
the convolution of the rotational speed and the sine of the inclination angle,
$v \sin i$. We developed a method to deconvolve this inverse problem and obtain
the cumulative distribution function (CDF) for stellar rotational velocities
extending the work of Chandrasekhar & M\"unch (1950). This method is applied a)
to theoretical synthetic data recovering the original velocity distribution
with very small error; b) to a sample of about 12.000 field main--sequence
stars, corroborating that the velocity distribution function is
non--Maxwellian, but is better described by distributions based on the concept
of maximum entropy, such as Tsallis or Kaniadakis distribution functions. This
is a very robust and novel method that deconvolve the rotational velocity
cumulative distribution function from a sample of $v \sin i$ data in just one
single step without needing any convergence criteria.


title:
Theory of low power ultra-broadband terahertz sideband generation in
  bi-layer graphene

abstract:
  In a semiconductor illuminated by a strong terahertz field, optically excited
electron-hole pairs can recombine to emit light in a broad frequency comb
evenly spaced by twice the terahertz frequency. Such high-order terahertz
sideband generation is of interest both as an example of extreme nonlinear
optics and also as a method for ultrafast electro-optical modulation. So far,
this phenomenon has only been observed with large field strengths (~10 kVcm-1),
an obstacle for technological applications. Here we predict that bi-layer
graphene generates high-order sidebands at much weaker terahertz fields. We
find that a terahertz field of strength 1 kVcm-1 can produce a high-sideband
spectrum of about 30 THz, 100 times broader than in GaAs. The sidebands are
generated despite the absence of classical collisions, with the quantum
coherence of the electron-hole pairs enabling recombination. These remarkable
features lower the barrier to desktop electro-optical modulation at terahertz
frequencies, facilitating ultrafast optical communications.


title:
A detailed proof of the fundamental theorem of STF multipole expansion
  in linearized gravity

abstract:
  The linearized field equations of general relativity in harmonic coordinates
are given by an inhomogeneous wave equation. In the region exterior to the
matter field, the retarded solution of this wave equation can be expanded in
terms of 10 Cartesian symmetric and tracefree (STF) multipoles in
post-Minkowskian approximation. For such a multipole decomposition only three
and rather weak assumptions are required:
  1. No-incoming radiation condition.
  2. The matter source is spatially compact.
  3. A spherical expansion for the metric outside the matter source is
possible.
  During the last decades, the STF multipole expansion has been established as
a powerful tool in several fields of gravitational physics: celestial
mechanics, theory of gravitational waves and in the theory of light propagation
and astrometry. But despite its formidable importance, an explicit proof of the
fundamental theorem of STF multipole expansion has not been presented thus far,
while only some parts of it are distributed into several publications. In a
technical but more didactical form, an explicit and detailed mathematical proof
of each individual step of this important theorem of STF multipole expansion is
represented.


title:
Bounds on the Stanley depth and Stanley regularity of edge ideals of
  clutters

abstract:
  Let $I$ be the edge ideal of a clutter $\mathcal{C}$ in a polynomial ring
$S$. In this paper, we present estimations of the Stanley depth of $I$ as well
as the Stanley regularity of $S/I$, in terms of combinatorial data from the
clutter $\mathcal{C}$.


title: The dynamics of a qubit reveals its coupling to a $N$ level system

abstract:
  Modeling the environment of a single qubit as an N dimensional quantum
system, we show that the dynamics of the qubit alone, if measured in sufficient
detail, can reveal the parameters of the qubit-environment coupling
Hamiltonian. We show that data from quantum process tomography experiments can
be used to get information about the environment that can be used to minimize
its deleterious effects on the state of the qubit.


title:
"Information-Friction" and its implications on minimum energy required
  for communication

abstract:
  Just as there are frictional losses associated with moving masses on a
surface, what if there were frictional losses associated with moving
information on a substrate? Indeed, many modes of communication suffer from
such frictional losses. We propose to model these losses as proportional to
"bit-meters," i.e., the product of mass of information (i.e., the number of
bits) and the distance of information transport. We use this "information-
friction" model to understand fundamental energy requirements on encoding and
decoding in communication circuitry. First, for communication across a binary
input AWGN channel, we arrive at fundamental limits on bit-meters (and thus
energy consumption) for decoding implementations that have a predetermined
input-independent length of messages. For encoding, we relax the fixed-length
assumption and derive bounds for flexible-message- length implementations.
Using these lower bounds we show that the total (transmit + encoding +
decoding) energy-per-bit must diverge to infinity as the target error
probability is lowered to zero. Further, the closer the communication rate is
maintained to the channel capacity (as the target error-probability is lowered
to zero), the faster the required decoding energy diverges to infinity.


title:
Extended Kerr-Schild spacetimes: General properties and some explicit
  examples

abstract:
  We study extended Kerr-Schild (xKS) spacetimes, i.e. an extension of the
Kerr-Schild (KS) ansatz where, in addition to the null KS vector, a spacelike
vector field appears in the metric. In contrast to the KS case, we obtain only
a necessary condition under which the KS vector is geodetic. However, it is
shown that this condition becomes sufficient if we appropriately restrict the
geometry of the null KS and spacelike vector. It turns out that xKS spacetimes
with a geodetic KS vector are of Weyl type I and the KS vector has the same
optical properties in the full and background spacetimes. In the case of Kundt
xKS spacetimes, the compatible Weyl types are further restricted and a few
examples of such metrics are provided. The relation of pp -waves to the class
of Kundt xKS spacetimes is briefly discussed. We also show that the CCLP black
hole, as an example of an expanding xKS spacetime, is of Weyl type Ii, which
specializes to type D in the uncharged or non-rotating limit, and that its
optical matrix satisfies the optical constraint.


title: Learning optimization models in the presence of unknown relations

abstract:
  In a sequential auction with multiple bidding agents, it is highly
challenging to determine the ordering of the items to sell in order to maximize
the revenue due to the fact that the autonomy and private information of the
agents heavily influence the outcome of the auction.
  The main contribution of this paper is two-fold. First, we demonstrate how to
apply machine learning techniques to solve the optimal ordering problem in
sequential auctions. We learn regression models from historical auctions, which
are subsequently used to predict the expected value of orderings for new
auctions. Given the learned models, we propose two types of optimization
methods: a black-box best-first search approach, and a novel white-box approach
that maps learned models to integer linear programs (ILP) which can then be
solved by any ILP-solver. Although the studied auction design problem is hard,
our proposed optimization methods obtain good orderings with high revenues.
  Our second main contribution is the insight that the internal structure of
regression models can be efficiently evaluated inside an ILP solver for
optimization purposes. To this end, we provide efficient encodings of
regression trees and linear regression models as ILP constraints. This new way
of using learned models for optimization is promising. As the experimental
results show, it significantly outperforms the black-box best-first search in
nearly all settings.


title:
Dynamics of convergent power series on the integral ring of a finite
  extension of $\Qp$

abstract:
  Let $K$ be a finite extension of the field $\mathbb{Q}_p$ of $p$-adic numbers
and $\O$ be its integral ring. The convergent power series with coefficients in
$\O$ are studied as dynamical systems on $\O$. A minimal decomposition theorem
for such a dynamical system is obtained. It is proved that there are
uncountably many minimal subsystems, provided that there is a minimal set
consisting of infinitely many points. In particular, the complete detailed
minimal decompositions of all affine systems are derived.


title:
Transport properties of monolayer MoS$_2$ grown by chemical vapour
  deposition

abstract:
  Recent success in the growth of monolayer MoS$_2$ via chemical vapor
deposition (CVD) has opened up prospects for the implementation of these
materials into thin film electronic and optoelectronic devices. Here, we
investigate the electronic transport properties of individual crystallites of
high quality CVD-grown monolayer MoS$_2$. The devices show low temperature
mobilities up to 500 cm$^2$V$^{-1}$s$^{-1}$ and a clear signature of metallic
conduction at high doping densities. These characteristics are comparable to
the electronic properties of the best mechanically exfoliated monolayers in
literature, verifying the high electronic quality of the CVD-grown materials.
We analyze the different scattering mechanisms and show, that the short-range
scattering plays a dominant role in the highly conducting regime at low
temperatures. Additionally, the influence of phonons as a limiting factor of
these devices is discussed.


title:
On Conservation Laws, Relaxation and Pre-relaxation after a Quantum
  Quench

abstract:
  We consider the time evolution following a quantum quench in spin-1/2 chains.
It is well known that local conservation laws constrain the dynamics and,
eventually, the stationary behavior of local observables. We show that some
widely studied models, like the quantum XY model, possess extra families of
local conservation laws in addition to the translation invariant ones. As a
consequence, the additional charges must be included in the generalized Gibbs
ensemble that describes the stationary properties. The effects go well beyond a
simple redefinition of the stationary state. The time evolution of a
non-translation invariant state under a (translation invariant) Hamiltonian
with a perturbation that weakly breaks the hidden symmetries underlying the
extra conservation laws exhibits pre-relaxation. In addition, in the limit of
small perturbation, the time evolution following pre-relaxation can be
described by means of a time-dependent generalized Gibbs ensemble.

categories: cond-mat.stat-mech math-ph math.MP quant-ph


title:
Labeled Sequent Calculus and Countermodel Construction for Justification
  Logics

abstract:
  Justification logics are modal-like logics that provide a framework for
reasoning about justifications. This paper introduces labeled sequent calculi
for justification logics, as well as for hybrid modal-justification logics.
Using the method due to Sara Negri, we internalize the Kripke-style semantics
of justification logics, known as Fitting models, within the syntax of the
sequent calculus to produce labeled sequent calculus. We show that our labeled
sequent calculi enjoy a weak subformula property, all of the rules are
invertible and the structural rules (weakening and contraction) and cut are
admissible. Finally soundness and completeness are established, and termination
of proof search for some of the labeled systems are shown. We describe a
procedure, for some of the labeled systems, which produces a derivation for
valid sequents and a countermodel for non-valid sequents. We also show a model
correspondence for justification logics in the context of labeled sequent
calculus.


title: Engineering spin-orbital magnetic insulator by tailoring superlattices

abstract:
  Novel interplay of spin-orbit coupling and electron correlations in complex
Ir oxides recently emerged as a new paradigm for correlated electron physics.
Because of a large spin-orbit coupling of ~0.5 eV, which is comparable to the
transfer energy t and the crystal field splitting $\Delta$ and Coulomb U, a
variety of ground states including magnetic insulator, band insulator,
semimetal and metal, shows up in a narrow materials phase space. Utilizing such
subtle competition of the ground states, we successfully tailor a spin-orbital
magnetic insulator out of a semimetal SrIrO$_3$ by controlling dimensionality
using superlattice of [(SrIrO$_3$)$_m$, SrTiO$_3$] and show that a magnetic
ordering triggers the transition to magnetic insulator. Those results can be
described well by a first-principles calculation. This study is an important
step towards the design and the realization of topological phases in complex Ir
oxides with very strong spin-orbit coupling.


title: Plasmons and their interaction with electrons in trilayer graphene

abstract:
  The interaction between electrons and plasmons in trilayer graphene is
investigated within the Overhauser approach resulting in the 'plasmaron'
quasi-particle. This interaction is cast into a field theoretical problem, nd
its effect on the energy spectrum is calculated using improved Wigner-Brillouin
perturbation theory. The plasmaron spectrum is shifted with respect to the bare
electron spectrum by $\Delta E(\mathbf{k})\sim 50\div200\,{\rm meV}$ for ABC
stacked trilayer graphene and for ABA trilayer graphene by $\Delta
E(\mathbf{k})\sim 30\div150\,{\rm meV}$ ($\Delta E(\mathbf{k})\sim 1\div5\,{\rm
meV}$) for the hyperbolic linear) part of the spectrum. The shift in general
increases with the electron concentration $n_{e}$ and electron momentum. The
dispersion of plasmarons is more pronounced in \textit{ABC} stacked than in ABA
tacked trilayer graphene, because of the different energy band structure and
their different plasmon dispersion.


title: Ultrafast electron diffraction using an ultracold source

abstract:
  We present diffraction patterns from micron-sized areas of mono-crystalline
graphite obtained with an ultracold and ultrafast electron source. We show that
high spatial coherence is manifest in the visibility of the patterns even for
picosecond bunches of appreciable charge, enabled by the extremely low source
temperature (~ 10 K). For a larger, ~ 100 um spot size on the sample, spatial
coherence lengths > 10 nm result, sufficient to resolve diffraction patterns of
complex protein crystals. This makes the source ideal for ultrafast electron
diffraction of complex macromolecular structures such as membrane proteins, in
a regime unattainable by conventional photocathode sources. By further reducing
the source size, sub-um spot sizes on the sample become possible with spatial
coherence lengths exceeding 1 nm, enabling ultrafast nano-diffraction for
material science.


title: Stability of hybrid Levy systems

abstract:
  Continuous-time stochastic systems have attracted a lot of attention
recently, due to their wide-spread use in finance for modelling price-dynamics.
More recently models taking into accounts shocks have been developed by
assuming that the return process is an infinitesimal Levy process. Levy
processes are also used to model the traffic in a telecommunication network. In
this paper we focus on a particular technical problem: stability of
time-varying stochastic systems driven or modulated by a Levy process with
discrete time interventions, such as parameter or state resetting. Such systems
will be called hybrid Levy systems. They are hybrid in the sense that jumps
both in the dynamics may occur. The peculiarity of our systems is that the
jump-times are defined by a more or less arbitrary point process, but there
exists an asymmetry in the system dynamics. The novelty of our model relative
to the theory of switching stochastic systems is two-fold. First, we allow slow
time variation of the parameters, in a stochastic sense, without any
statistical pattern, in the spirit of the classical stability result of Desoer.
Secondly, we allow certain jumps (resetting) in the system parameters almost
without any a priori condition.


title:
Galactic Cosmic Rays measured by UVS on Voyager 1 and the end of the
  modulation: Is the upwind heliopause a collapsed charge-exchange layer?

abstract:
  The detectors of the UltraViolet Spectrographs (UVS) on Voyager 1/2 are
recording a background that was earlier assigned to disintegrations in the RTG.
We show that it arises instead from Galactic Cosmic Rays (GCRs). We show the
1992-2013 GCR flux measured by UVS on V1 and, by comparing with data from the
GCR dedicated detectors, we estimate the energy range responsible for this UVS
signal, around 300 MeV, and the response of UVS to the GCR anisotropy. After
the abrupt jumps of May and August 2012 the count rate has been fluctuating
only slightly around a constant value, but comparing with data from the LECP
and the CRS instruments shows that those small variations are only responses to
a varying anisotropy and not to a flux change. Taking advantage of the
similarity in energy range to one of the products of the CRS instrument suite,
we use the ratio between the two independent signals as a proxy for the
temporal evolution of the GCR spectral slope around the 300 MeV range. We show
that this slope has remained unchanged since Aug 2012 and find strong evidence
that it will no longer vary, implying the end of the modulation at those
energies and that V1 at this date is near or past the heliopause. The origin of
this narrow and stagnating inner heliosheath is still unclear, and we discuss
the potential effects of low solar wind speed episodes and subsequent
self-amplified charge-exchange with interstellar neutrals, as a source of
deceleration and collapse. We suggest that the quasi-static region encountered
by V1 may be related to such effects, triggered by the strong post
solar-maximum variability. This did not happen for V2 due to its trajectory at
an angle further from the heliosphere axis and a later termination shock
crossing. The existence on the upwind side of a mixing layer formed by charge
transfer instead of a pure plasma contact discontinuity could explain various
observations.


title:
Thermodynamic properties of the electron gas in multilayer graphene in
  the presence of a perpendicular magnetic field

abstract:
  The thermodynamic properties of the electron gas in multilayer graphene
depend strongly on the number of layers and the type of stacking. Here we
analyse how those properties change when we vary the number of layers for
rhombohedral stacked multilayer graphene and compare our results with those
from a conventional two dimensional electron gas. We show that the highly
degenerate zero energy Landau level which is partly filled with electrons and
partly with holes has a strong influence on the value of the different
thermodynamic quantities.


title: A Concise Force Calculation for Hybrid Monte Carlo with Improved Actions

abstract:
  We present a concise way to calculate force for Hybrid Monte Carlo with
improved actions using the fact that changes in thin and smeared link matrices
lie in their respective tangent vector spaces. Since hypercubic smearing
schemes are very memory intensive, we also present a memory optimized
implementation of them.


title:
Empirical characteristic function identification of linear stochastic
  systems with possibly unstable zeros

abstract:
  The purpose of this paper is to adapt the empirical characteristic function
(ECF) method to stable, but possibly not inverse stable linear stochastic
system driven by the increments of a Levy-process. A remarkable property of the
ECF method for i.i.d. data is that, under an ideal setting, it gives an
efficient estimate of the unknown parameters of a given parametric family of
distributions. Variants of the ECF method for special classes of dependent data
has been suggested in several papers using the joint characteristic function of
blocks of unprocessed data. However, the latter may be unavailable for
Levy-systems. We introduce a new, computable score that is essentially a kind
of output error. The feasibility of the procedure is based on a result of
Devroye on the generation of r.v.-s with given c.f. Two special cases are
considered in detail, and the asymptotic covariance matrices of the estimators
are given. The present work extends our previous work on the ECF identification
of stable and inverse stable linear stochastic Levy-systems.


title:
Connection between response parameter and anomaly coefficient in two
  dimensional anomalous fluid

abstract:
  In (1+1) dimensional hydrodynamics in presence of the gravitational
anomalies, the constitutive relations for the stress tensor contain the
response parameters $\bar{C}_1$, $\bar{C}_2$ and the gravitation anomaly
coefficients $c_g$, $c_w$. Here it is shown that they are related by the two
relations $\bar{C}_1 = 4\pi^2 c_w$ and $\bar{C}_2 = 8\pi^2 c_g$. This agrees
with the earlier findings. I argue that the Israel-Hartle-Hawking vacuum is the
natural boundary condition which leads to such relation. Finally, the possible
physical implications are discussed.


title: On the Deformation of Lie-Yamaguti algebras

abstract:
  The deformation theory of Lie-Yamaguti algebras is developed by choosing a
suitable cohomology. The relationship between the deformation and the
obstruction of Lie-Yamaguti algebras is obtained.


title:
Design and Optimization of Low Energy Beam Transport for TAC Proton
  Facility

abstract:
  In this study, a low energy beam transport (LEBT) channel for the proton
linac section of the Turkish Accelerator Center (TAC) has been designed by
using TRAVEL code. Commonly used LEBT including two focusing solenoid magnets
will transport and match the H- beam from a volume source to RFQ. In the beam
dynamics simulations of such a LEBT line, 95% space-charge compensation (SCC)
has been considered in this study. We aimed to find out the determination of
our RFQ input parameters that gives the best possible beam quality at the
entrance of the RFQ using beam collimator in the LEBT line as an alternative
way. In this way, we have acquired the best possible beam quality on RFQ input
plane as well as optimizing the LEBT line.


title:
Acoustic superradiance from an optical-superradiance-induced vortex in a
  Bose-Einstein condensate

abstract:
  We consider the simultaneous scattering of an angular momentum carrying
Laguerre-Gaussian light beam and an acoustic wave from an atomic Bose-Einstein
condensate, under condition of optical superradiance induced vortex state. We
derive the mean field dynamical equations of the light-superfluid system, and
obtain the equations governing the elementary excitation of the system which
result in a massless Klein-Gordon equation with source terms. This equation
describes the propagation of the sound wave in an effective spacetime.
Employing a simplifying draining bathtub model for the vortex, we investigate
the scattering of the acoustic wave in the vortex phase and obtain a condition
for the acoustic superradiance. We conclude that Laguerre-Gaussian beam induced
sudden transition from homogeneous to vortex state in the superfluid
simultaneously leads to the optical and acoustic superradiance.


title:
Formaldehyde and H110a observations towards 6.7 GHz methanol maser
  sources

abstract:
  Intriguing work on observations of 4.83 GHz formaldehyde (H2CO) absorptions
and 4.87 GHz H110a radio recombination lines (RRLs) towards 6.7 GHz methanol
(CH3OH) maser sources is presented. Methanol masers provide ideal sites to
probe the earliest stages of massive star formation, while 4.8 GHz formaldehyde
absorptions are accurate probes of physical conditions in dense $(10^{3} -
10^{5} cm^{-3})$ and low temperature molecular clouds towards massive star
forming regions. The work is aimed at studying feature similarities between the
formaldehyde absorptions and the methanol masers so as to expand knowledge of
events and physical conditions in massive star forming regions. A total of 176
methanol maser sources were observed for formaldehyde absorptions, and
formaldehyde absorptions were detected 138 of them. 53 of the formaldehyde
absorptions were newly detected. We noted a poor correlation between the
methanol and formaldehyde intensities, an indication that the signals (though
arise from about the same regions) are enhanced by different mechanisms. Our
results show higher detection rates of the formaldehyde lines for sources with
stronger methanol signals. The strongest formaldehyde absorptions were
associated with IRAS sources and IRDCs that have developed HII regions, and
that do not have EGOs.


title: One flavor mass reweighting: foundations

abstract:
  Reweighting is not a new method in lattice QCD, but a comprehensive analysis
is missing in the literature. We close this gap by presenting: (i) a proof of
an integral representation of the complex determinant of a complex matrix, (ii)
a method to control the stochastic error of its Monte Carlo estimation, (iii)
expansions of the stochastic error and the ensemble fluctuations of the one
flavor reweighting factor. Based on (iii) we present a detailed scaling
analysis and optimized reweighting strategies. As an application we analyze the
ensemble fluctuations of the reweighting factor corresponding to the sea
contribution to isospin splitting and predict at physical quark masses a
standard deviation of +-20%.


title:
On the Spectroscopic Method of Measuring the Size of the Semiconductor
  Nanocrystals

abstract:
  The dependences of the fundamental transition on the semiconductor quantum
dot size obtained experimentally at various temperatures using different
measuring methods are analyzed and compared. The possibility to extrapolate the
results for the case of arbitrary temperature is discussed.


title:
Crossover from droplet to flat initial conditions in the KPZ equation
  from the replica Bethe ansatz

abstract:
  We show how our previous result based on the replica Bethe ansatz for the
Kardar Parisi Zhang (KPZ) equation with the "half-flat" initial condition leads
to the Airy$_2$ to Airy$_1$ (i.e. GUE to GOE) universal crossover one-point
height distribution in the limit of large time. Equivalently, we obtain the
distribution of the free energy of a long directed polymer (DP) in a random
potential with one fixed endpoint and the other one on a half-line. We then
generalize to a DP when each endpoint is free on its own half-line. It amounts,
in the limit of large time, to obtain the distribution of the maximum of the
transition process Airy$_{2\to 1}$ (minus a half-parabola) on a half line.

categories: cond-mat.dis-nn cond-mat.stat-mech math-ph math.MP


title:
PolarBase: a data base of high resolution spectropolarimetric stellar
  observations

abstract:
  PolarBase is an evolving data base that contains all stellar data collected
with the ESPaDOnS and NARVAL high-resolution spectropolarimeters, in their
reduced form, as soon as they become public. As of early 2014, observations of
2,000 stellar objects throughout the Hertzsprung-Russell diagram are available.
Intensity spectra are available for all targets, and the majority of the
observations also include simultaneous spectra in circular or linear
polarization, with the majority of the polarimetric measurements being
performed only in circularly polarized light (Stokes V). Observations are
associated with a cross-correlation pseudo-line profile in all available Stokes
parameters, greatly increasing the detectability of weak polarized signatures.
Stokes V signatures are detected for more than 300 stars of all masses and
evolutionary stages, and linear polarization is detected in 35 targets. The
detection rate in Stokes V is found to be anti-correlated with the stellar
effective temperature. This unique set of Zeeman detections offers the first
opportunity to run homogeneous magnetometry studies throughout the H-R diagram.
The web interface of PolarBase is available at http://polarbase.irap.omp.eu.


title:
PCA-based inversion of stellar fundamental parameters from
  high-resolution Echelle spectra

abstract:
  The general context of this study is the inversion of stellar fundamental
parameters from high-resolution Echelle spectra. We aim at developing a fast
and reliable tool for the post-processing of spectra produced, in particular,
by the Espadons and Narval spectropolarimeters. Our inversion tool relies on
principal component analysis. It allows reduction of dimensionality and the
definition of a specific metric for the search of nearest neighbours between an
observed spectrum and a set of synthetic spectra. Effective temperature,
surface gravity, total metallicity and projected rotation velocity are derived.
Our first tests, essentially done from the sole information coming from the
spectral band that the RVS spectrometer will soon observe from the GAIA space
observatory, and with spectra from mainly FGK-dwarfs are very promising. We
also tested our method with a few targets beyond this domain of the H-R
diagram.


title: Optimized simulated annealing for Ising spin glasses

abstract:
  We present several efficient implementations of the simulated annealing
algorithm for Ising spin glasses on sparse graphs. In particular, we provide a
generic code for any choice of couplings, an optimized code for bipartite
graphs, and highly optimized implementations using multi-spin coding for graphs
with small maximum degree and discrete couplings with a finite range. The
latter codes achieve up to 50 spin flips per nanosecond on modern Intel CPUs.
We also compare the performance of the codes to that of the special purpose
D-Wave devices built for solving such Ising spin glass problems.


title: Distribution-Sensitive Construction of the Greedy Spanner

abstract:
  The greedy spanner is the highest quality geometric spanner (in e.g. edge
count and weight, both in theory and practice) known to be computable in
polynomial time. Unfortunately, all known algorithms for computing it take
Omega(n^2) time, limiting its applicability on large data sets.
  We observe that for many point sets, the greedy spanner has many `short'
edges that can be determined locally and usually quickly, and few or no `long'
edges that can usually be determined quickly using local information and the
well-separated pair decomposition. We give experimental results showing large
to massive performance increases over the state-of-the-art on nearly all tests
and real-life data sets. On the theoretical side we prove a near-linear
expected time bound on uniform point sets and a near-quadratic worst-case
bound.
  Our bound for point sets drawn uniformly and independently at random in a
square follows from a local characterization of t-spanners we give on such
point sets: we give a geometric property that holds with high probability on
such point sets. This property implies that if an edge set on these points has
t-paths between pairs of points `close' to each other, then it has t-paths
between all pairs of points.
  This characterization gives a O(n log^2 n log^2 log n) expected time bound on
our greedy spanner algorithm, making it the first subquadratic time algorithm
for this problem on any interesting class of points. We also use this
characterization to give a O((n + |E|) log^2 n log log n) expected time
algorithm on uniformly distributed points that determines if E is a t-spanner,
making it the first subquadratic time algorithm for this problem that does not
make assumptions on E.


title: Power Grid Defense Against Malicious Cascading Failure

abstract:
  An adversary looking to disrupt a power grid may look to target certain
substations and sources of power generation to initiate a cascading failure
that maximizes the number of customers without electricity. This is
particularly an important concern when the enemy has the capability to launch
cyber-attacks as practical concerns (i.e. avoiding disruption of service,
presence of legacy systems, etc.) may hinder security. Hence, a defender can
harden the security posture at certain power stations but may lack the time and
resources to do this for the entire power grid. We model a power grid as a
graph and introduce the cascading failure game in which both the defender and
attacker choose a subset of power stations such as to minimize (maximize) the
number of consumers having access to producers of power. We formalize problems
for identifying both mixed and deterministic strategies for both players, prove
complexity results under a variety of different scenarios, identify tractable
cases, and develop algorithms for these problems. We also perform an
experimental evaluation of the model and game on a real-world power grid
network. Empirically, we noted that the game favors the attacker as he benefits
more from increased resources than the defender. Further, the minimax defense
produces roughly the same expected payoff as an easy-to-compute deterministic
load based (DLB) defense when played against a minimax attack strategy.
However, DLB performs more poorly than minimax defense when faced with the
attacker's best response to DLB. This is likely due to the presence of low-load
yet high-payoff nodes, which we also found in our empirical analysis.


title: Gauge inflation by kinetic coupled gravity

abstract:
  Recently, a new class of inflationary models, so called \emph{gauge-flation}
or non-Abelian gauge field inflation has been introduced where the slow-roll
inflation is driven by a non-Abelian gauge field $\textbf{A}$ with the field
strength $\textbf{F}$. This class of models are based on a gauge field theory
having $\textbf{F}^2$ and $\textbf{F}^4$ terms with a non-Abelian gauge group
minimally coupled to gravity. Here, we present a new class of such inflationary
models based on a gauge field theory having only $\textbf{F}^2$ term with
non-Abelian gauge fields non-minimally coupled to gravity. The non-minimal
coupling is set up by introducing the Einstein tensor besides the metric tensor
within the $\textbf{F}^2$ term, which is called kinetic coupled gravity. A
perturbation analysis is performed to confront the inflation under
consideration with Planck and BICEP2 results.


title:
A Novel Algorithm for the Estimation of the Surfactant Surface Excess at
  Emulsion Interfaces

abstract:
  When the theoretical values of the interfacial tension -resulting from the
homogeneous distribution of ionic surfactant molecules amongst the interface of
emulsion drops- are plotted against the total surfactant concentration, they
produce a curve comparable to the Gibbs adsorption isotherm. However, the
actual isotherm takes into account the solubility of the surfactant in the
aqueous bulk phase. Hence, assuming that the total surfactant population is
only distributed among the available oil/water interfaces, one can calculate
what surface concentration is necessary to reproduce the experimental values of
the interfacial tension. A similar procedure can be followed using the zeta
potential of the drops as a standard for a given set of salt and surfactant
concentrations. We applied these procedures to the case of hexadecane/water
nanoemulsions at different salt concentrations. This information was used to
compute typical interaction potentials between non-deformable nanoemulsion
drops. The results indicate that there are significant differences between the
surfactant population expected from macroscopic adsorption isotherms, and the
actual surfactant popula- tion adsorbed to the surface of nanoemulsion drops.


title: Automatic Enumeration of Generalized Menage Numbers

abstract:
  I describe an empirical-yet-rigorous, algorithm, based on Riordan's rook
polynomials and the so-called C-finite ansatz, fully implemented in the
accompanying Maple package
(http://www.math.rutgers.edu/~zeilberg/tokhniot/MENAGES ), MENAGES, that
reproduces in a few seconds, rigorously-proved enumeration theorems on
permutations with restricted positions, previously proved by quite a few
illustrious human mathematicians, and that can go far beyond any human
attempts.


title:
Dirac approach to constrained submanifolds in a double loop group: from
  WZNW to Poisson-Lie $\sigma $-model

abstract:
  We study the restriction to a family of second class constrained submanifolds
in the cotangent bundle of a double Lie group, equipped with a 2-cocycle
extended symplectic form, building the corresponding Dirac brackets. It is
shown that, for a 2-cocycle vanishing on each isotropic subspaces of the
associated Manin triple, the Dirac bracket contains no traces of the cocycle.
We also investigate the restriction of the left translation action of the
double Lie group on its cotangent bundle, where it fails in to be a symmetry a
canonical transformation. However, the hamiltonian symmetry is restored on some
special submanifolds. The main application is on loop groups, showing that a
WZNW-type model on the double Lie group with a quadratic Hamilton function in
the momentum maps associated with the left translation action on the cotangent
bundle with the canonical symplectic form, restricts to a collective system on
some special submanifolds. There, the lagrangian version coincides with so
called Poisson-Lie $\sigma $-model.


title:
The M4 Core Project with HST -- II. Multiple Stellar Populations at the
  Bottom of the Main Sequence

abstract:
  The M4 Core Project with HST is designed to exploit the Hubble Space
Telescope to investigate the central regions of M4, the Globular Cluster
closest to the Sun. In this paper we combine optical and near-infrared
photometry to study multiple stellar populations in M4. We detected two
sequences of M-dwarfs containing ~38% (MS_I) and ~62% (MS_II) of MS stars below
the main-sequence (MS) knee. We compare our observations with those of NGC2808,
which is the only other GCs where multiple MSs of very low-mass stars have been
studied to date. We calculate synthetic spectra for M-dwarfs, assuming the
chemical composition mixture inferred from spectroscopic studies of stellar
populations along the red giant branch, and different Helium abundances, and we
compare predicted and observed colors. Observations are consistent with two
populations, one with primordial abundance and another with enhanced nitrogen
and depleted oxygen.


title:
Bayesian compressive sensing for ultrawideband inverse scattering in
  random media

abstract:
  We develop an ultrawideband (UWB) inverse scattering technique for
reconstructing continuous random media based on Bayesian compressive sensing.
In addition to providing maximum a posteriori estimates of the unknown weights,
Bayesian inversion provides estimate of the confidence level of the solution,
as well as a systematic approach for optimizing subsequent measurement(s) to
maximize information gain. We impose sparsity priors directly on spatial
harmonics to exploit the spatial correlation exhibited by continuous media, and
solve for their posterior probability density functions efficiently using a
fast relevance vector machine. We linearize the problem using the first-order
Born approximation which enables us to combine, in a single inversion,
measurements from multiple transmitters and ultrawideband frequencies. We
extend the method to high-contrast media using the distorted-Born iterative
method. We apply time-reversal strategies to adaptively focus the inversion
effort onto subdomains of interest, and hence reduce the overall inversion
cost. The proposed techniques are illustrated in a number of canonical
scenarios including crosshole and borehole sensing.


title: Convexity theorems for semisimple symmetric spaces

abstract:
  We prove a remarkable generalization of a convexity theorem for semisimple
symmetric spaces G/H established earlier in 1986 by the second named author.
The latter result generalized Kostant's non-linear convexity theorem for the
Iwasawa decomposition of a real semisimple Lie group.
  The present generalization involves Iwasawa decompositions related to minimal
parabolic subgroups of G of arbitrary type instead of the particular type
relative to H considered in 1986.


title:
Study of variations as desired-relative (DELTA), rather than absolute,
  differences: falsification of the purpose of achieving source-representative
  and closely comparable lab-results

abstract:
  Recently (arXiv:1101.0973), it has been pointed out by us that the possible
variation in any source (S) specific elemental isotopic (viz. 2H/1H) abundance
ratio SR can more accurately be assessed by its absolute estimate Sr [viz. as
(Sr - DR), with D as a standard-source] than by either corresponding
measured-relative (S/W-DELTA) estimate ([Sr/Wr] - 1) or
DELTA-scale-converted-relative (S/D-DELTA) estimate ([Sr/DR] - 1). Here, we
present the fundamentals behind scale-conversion, thereby enabling to
understand why at all Sr should be the source- and/ or variation-characterizing
key, i.e. why different lab-specific results should be more closely comparable
as absolute estimates (SrLab1, SrLab2) than as desired-relative (S/D-DELTALab1,
S/D-DELTALab2) estimates. Further, the study clarifies that: (i) the
DELTA-scale-conversion (S/W-DELTA into S/D-DELTA, even with the aid of
calibrated auxiliary-reference-standard(s) Ai(s)) cannot make the estimates (as
S/D-DELTA, and thus Sr) free of the measurement-reference W; (ii) the employing
of (increasing number of) Ai-standards should cause the estimates to be rather
(increasingly) inaccurate and, additionally, Ai(s)-specific; and (iii) the
S/D-DELTA-estimate may, specifically if S happens to be very close to D in
isotopic composition (IC), even misrepresent S; but the corresponding Sr should
be very accurate. However, for S and W to be increasingly closer in IC, the
S/D-DELTA-estimate and also Sr are shown to be increasingly accurate,
irrespective of whether the S/W-DELTA-measurement accuracy could thus be
improved or not. Clearly, improvement in measurement-accuracy should ensure
additional accuracy in results.


title:
Effective conditions for the reflection of an acoustic wave by
  low-porosity perforated plates

abstract:
  This paper describes an investigation of the acoustic properties of a rigid
plate with a periodic pattern of holes, in a compressible, ideal, inviscid
fluid in the absence of mean flow. Leppington and Levine (J. Fluid Mech., 1973)
obtained an approximation of the reflection and transmission coefficients of a
plane wave incident on an infinitely thin plate with a rectangular array of
perforations, assuming that a characteristic size of the perforations is
negligible relative to that of the unit cell of the grating, itself assumed to
be negligible relative to the wavelength. One part of the present study is of
methodological interest. It establishes that it is possible to extend their
approach to thick plates with a skew grating of perforations, thus confirming
recent results in Bendali et al. (SIAM J. Appl. Math., 2013), but in a much
simpler way without using complex matched asymptotic expansions of the full
wave or to a grating of multipoles. As is well-known, effective compliances for
the plate can then be derived from the corresponding approximations of the
reflection and transmission coefficients. These compliances are expressed in
terms of the Rayleigh conductivity of an isolated perforation. Consequently, in
one other part of the present study, the methodology recently introduced in
Laurens et al. (ESAIM:M2AN, 2013) to obtain sharp bounds for the Rayleigh
conductivity has been extended to include the case for which the openings of
the perforations on the upper and lower sides of the plate are elliptical in
shape. This not only enables the determination of these bounds and of the
associated reflection and transmission coefficients for actual plates with
tilted perforations but also yields single expressions covering all usual cases
of perforations: straight or tilted with a circular or an elliptical
cross-section.


title:
A Differential Integrability Condition for Two-Dimensional Hamiltonian
  Systems

abstract:
  We review, restate, and prove a result due to Kaushal and Korsch [Phys. Lett.
A 276, 47 (2000)] on the complete integrability of two-dimensional Hamiltonian
systems whose Hamiltonian satisfies a set of four linear second order partial
differential equations. In particular, we show that a two-dimensional
Hamiltonian system is completely integrable, if the Hamiltonian has the form
$H=T+V$ where $V$ and $T$ are respectively harmonic functions of the
generalized coordinates and the associated momenta.

categories: math-ph math.MP physics.class-ph quant-ph


title:
Definition of a moist-air entropy potential temperature. Application to
  FIRE-I data flights

abstract:
  A moist entropy potential temperature -- denoted by ${\theta}_{s}$ -- is
defined analytically in terms of the specific entropy for moist air. The
expression for ${\theta}_{s}$ is valid for a general mixing of dry air, water
vapour and possible condensed water species. It verifies the same conservative
properties as the moist entropy, even for varying dry air or total water
content. The moist formulation for ${\theta}_{s}$ is equal to the dry
formulation $\theta$ if dry air is considered and it verifies new properties
valid for the moist air cases, both saturated or under-saturated ones. Exact
and approximate versions of ${\theta}_{s}$ are evaluated for several
Stratocumulus cases, in particular by using the aircraft observations FIRE-I
experiment data sets. It appears that there is no (or small) jump in
${\theta}_{s}$ at the top of the PBL. The mixing in moist entropy is almost
complete in the PBL, with the same values observed in the clear air and the
cloudy regions, including the very top of the entrainment region. The
Randall-Deardorff CTEI analysis may be interpreted as a mixing in moist entropy
criterion. The iso-${\theta}_{s}$ lines are plotted on skew $T$-$\ln(p)$ and
conserved variable diagrams. All these properties could suggest some hints on
the use of moist entropy (or ${\theta}_{s}$) in cloud modelling or in mixing
processes, with the marine Stratocumulus considered as a paradigm of moist
turbulence.


title: Kinematic relativity of quantum Hamiltonian

abstract:
  It is shown that the well-known relativistic correction of quantum
Hamiltonian that is present in textbooks appears after quantization of
oversimplified relativistic kinetic energy decomposition. Using the proper
expression one obtains the kinetic energy operator which relation with the
ususal one is consistent with corresponding relation of kinetic energies in
special relativity theory. The Schr\"odinger equation with this operator gives
new interesting possibilities for quantum phenomena description.


title: The Dirichlet problem and spectral theory of operator algebras

abstract:
  The main result of the paper is an extension of the Dirichlet problem from
(closures of) bounded open domains U to arbitrary compact subsets X of the
complex plane, i.e. the closure of the corresponding space of functions which
are harmonic in a neighbourhood of X and equipped with the supremums norm on X
is shown to be isometric with the space of continuous functions C (/delta X) on
its Shilov boundary (a given compact subset of X). This is used to define an
extension of holomorphic function calculus with respect to certain (weakly
normal) elements x of a unital operator algebra A to a completely isometric
harmonic function calculus into the enveloping operator system of A. It is also
shown that in case of a super C*-algebra A (operator algebra with involution)
any weakly normal superpositive element x has a square root in A.


title:
On the biological and cultural evolution of shame: Using internet search
  tools to weight values in many cultures

abstract:
  Shame has clear biological roots and its precise form of expression affects
social cohesion and cultural characteristics. Here we explore the relative
importance between shame and guilt by using Google Translate to produce
translation for the words shame, guilt, pain, embarrassment and fear to the 64
languages covered. We also explore the meanings of these concepts among the
Yanomami, a horticulturist hunter-gatherer tribe in the Orinoquia. Results show
that societies previously described as 'guilt societies' have more words for
guilt than for shame, but the large majority, including the societies
previously described as 'shame societies', have more words for shame than for
guilt. Results are consistent with evolutionary models of shame which predict a
wide scatter in the relative importance between guilt and shame, suggesting
that cultural evolution of shame has continued the work of biological
evolution, and that neither provides a strong adaptive advantage to either
shame or guilt. We propose that the study of shame will improve our
understanding of the interaction between biological and cultural evolution in
the evolution of cognition and emotions.


title:
Some recent theoretical progress in Higgs boson and top quark physics at
  hadron colliders

abstract:
  The test of the Standard Model and search for New Physics signal are main aim
of LHC experiment. With the increasing of the measurement accuracy at the LHC,
it is a major task in future to exceed the current accuracy of the theoretical
predictions for important processes, in particular ones involving Higgs boson
and top quark. In this review we briefly summarize some recent theoretical
progress in Higgs boson and top quark physics, especially the fixed-order and
resummation predictions in QCD at both the Tevatron and the LHC.


title: How to enhance effectiveness of Direct Attack Judo throws

abstract:
  In this paper is performed an appraisal of the Olympic Sport Judo
effectiveness in the optics of Biomechanics. To broaden the classical view,the
field of experimentation is obviously the high level competition in which most
of rotational application can be found applied more or less instinctively by
high level Athletes. Considering the two biomechanical tools that are the
physical basis of judo throws it is possible to obtain such results from the
analysis of high competition application:Lever Techniques are enhanced in their
effectiveness in three ways: The rotational movements, strictly connected to
the Lever techniques mechanics achieving victory in competition, can be
extended to the unbalance phase. The rotational movements can be applied in a
totally new way putting away even the unbalance that is basic in the Lever
techniques. The Lever tool can be hybridized with the Couple tool to lower the
energy consumption. Couple Techniques are enhanced in their effectiveness also
in three ways: The Couple tool that doesnt need unbalance allowing uke body
rotate around his center of mass, is enhanced utilizing the Uke body smaller
resistance directions,normally summarized in Diagonal attacks. The vertical
rotational movements in the transverse plan with the axis in the sagittal plane
can be added to the Couple application with transverse rotation and axis in the
frontal plane to overcome some defensive resistance, mainly in the trunk and
leg group of Couple techniques,like Uchi Mata or O Soto Gari. The rotational
movements enhance the throwing action changing the mechanics of Couple into
Lever applying a Torque,both with the direction change of one force or the time
delay of his application. This analysis, expanded with a short physical
framework, clarifies hidden deep concepts and helps teacher and coaches in
their professional work.


title: Dedekind completions, neat embeddings and omitting types

abstract:
  Let n be finite >2. We show that any class between S\Nr_n\CA_{n+3} and RCA_n
is not atom canonical, and any class containing the class of completely
representable algebras and contained in S_c\Nr_n\CA_{n+3} is not elementary. We
show that there is no finite variable universal axiomatization of many diagonal
free reducts of representable cylindric algebras of dimension n, like the
varieties of representable diagonal-free cylindric algebras and Halmos'
polyadic algebras (without equality). We apply our hitherto obtained algebraic
results to show that the omitting types theorem fails for finite variable
fragments of first order logic with and without equality, having n variables,
even if we count in severely relativized models as candidates for omitting
single non-principle types. Finally, we show that for many cylindric-like
algebras, like diagonal free cylindric algebras and Halmos' polyadic algebras
with and without equality the class of strongly representable atom structures
of finite dimension >2 is not elementary.


title:
Searches for HCl and HF in comets 103P/Hartley 2 and C/2009 P1 (Garradd)
  with the Herschel space observatory

abstract:
  HCl and HF are expected to be the main reservoirs of fluorine and chlorine
wherever hydrogen is predominantly molecular. They are found to be strongly
depleted in dense molecular clouds, suggesting freeze-out onto grains in such
cold environments. We can then expect that HCl and HF were also the major
carriers of Cl and F in the gas and icy phases of the outer solar nebula, and
were incorporated into comets. We aimed to measure the HCl and HF abundances in
cometary ices as they can provide insights on the halogen chemistry in the
early solar nebula. We searched for the J(1-0) lines of HCl and HF at 626 and
1232 GHz, respectively, using the HIFI instrument on board the Herschel Space
Observatory. HCl was searched for in comets 103P/Hartley 2 and C/2009 P1
(Garradd), whereas observations of HF were conducted in comet C/2009 P1. In
addition, observations of H$_2$O and H$_2^{18}$O lines were performed in C/2009
P1 to measure the H$_2$O production rate. Three lines of CH$_3$OH were
serendipitously observed in the HCl receiver setting. HCl is not detected,
whereas a marginal (3.6-$\sigma$) detection of HF is obtained. The upper limits
for the HCl abundance relative to water are 0.011% and 0.022%, for 103P and
C/2009 P1, respectively, showing that HCl is depleted with respect to the solar
Cl/O abundance by a factor more than 6$^{+6}_{-3}$ in 103P, where the error is
related to the uncertainty in the chlorine solar abundance. The marginal HF
detection obtained in C/2009 P1 corresponds to an HF abundance relative to
water of (1.8$\pm$0.5) $\times$ 10$^{-4}$, which is approximately consistent
with a solar photospheric F/O abundance. The observed depletion of HCl suggests
that HCl was not the main reservoir of chlorine in the regions of the solar
nebula where these comets formed. HF was possibly the main fluorine compound in
the gas phase of the outer solar nebula.


title:
Relaxations for multi-period optimal power flow problems with discrete
  decision variables

abstract:
  We consider a class of optimal power flow (OPF) applications where some loads
offer a modulation service in exchange for an activation fee. These
applications can be modeled as multi-period formulations of the OPF with
discrete variables that define mixed-integer non-convex mathematical programs.
We propose two types of relaxations to tackle these problems. One is based on a
Lagrangian relaxation and the other is based on a network flow relaxation. Both
relaxations are tested on several benchmarks and, although they provide a
comparable dual bound, it appears that the constraints in the solutions derived
from the network flow relaxation are significantly less violated.


title: Structured random measurements in signal processing

abstract:
  Compressed sensing and its extensions have recently triggered interest in
randomized signal acquisition. A key finding is that random measurements
provide sparse signal reconstruction guarantees for efficient and stable
algorithms with a minimal number of samples. While this was first shown for
(unstructured) Gaussian random measurement matrices, applications require
certain structure of the measurements leading to structured random measurement
matrices. Near optimal recovery guarantees for such structured measurements
have been developed over the past years in a variety of contexts. This article
surveys the theory in three scenarios: compressed sensing (sparse recovery),
low rank matrix recovery, and phaseless estimation. The random measurement
matrices to be considered include random partial Fourier matrices, partial
random circulant matrices (subsampled convolutions), matrix completion, and
phase estimation from magnitudes of Fourier type measurements. The article
concludes with a brief discussion of the mathematical techniques for the
analysis of such structured random measurements.


title: Physical alternative to the dark energy paradigm

abstract:
  The physical nature of the presently dominating enigmatic dark energy in the
expanding universe is demonstrated to be explainable as an excess of the
kinetic energy with respect to its potential energy. According to traditional
Friedman cosmology, any non-zero value of the total energy integral is ascribed
to the space curvature. However, as we show, in the flat universe the total
energy also can be different from zero. Initially, a very small excess of
kinetic energy originates from the early universe. The present observational
data show that our universe has probably a flat space with an excess of kinetic
energy. The evolutionary scenario shows that the universe presently is in the
transitional stage where its radial coordinate expansion approaches the
velocity of light. A possibility of the closed Bubble universe with the local
Big Bang and everlasting expansion is demonstrated. Dark matter can be
essentially contributed by the non-relativistic massive neutrinos, which have
cooled to very low temperatures and velocities thus favoring the formation of
the observed broad equipotential wells in galaxies.


title:
Proof of a conjecture related to divisibility properties of binomial
  coefficients

abstract:
  Let $a,b$ and $n$ be positive integers with $a>b$. In this note, we prove
that $$(2bn+1)(2bn+3){2bn \choose bn}\bigg|3(a-b)(3a-b){2an \choose
an}{an\choose bn}.$$ This confirms a recent conjecture of Amdeberhan and Moll.


title:
Comprehensive ab initio study of doping in bulk ZnO with group-V
  elements

abstract:
  Despite the lack of reproducible experimental confirmation, group-V elements
have been considered as possible sources of p-type doping in ZnO in the form of
simple and complex defects. Using ab initio calculations, based on
state-of-the-art hybrid exchange-correlation functional, we study a wide range
of defects and defect complexes related with N, P, As, and Sb impurities. We
show that none of the candidates for p-type doping can be considered a good
source of holes in the valence band due to deep acceptor levels and low
formation energies of compensating donor defects. In addition, we discuss the
stability of complexes in different regimes.


title: $J/\psi$ in a hot baryonic plasma

abstract:
  We calculate the bound state properties of $J/\psi$ in a hot and dense QCD
plasma using phenomenological potentials augmented by inputs from perturbative
QCD. The temperature and density region of study will be relevant in future
heavy ion collision experiments at FAIR. We find that the effect of baryon
density on the dissociation of $J/\psi$ is small in this regime. However we
indicate that if there is a critical end point in the QCD phase diagram then
strong density fluctuation will dissociate charmonia near hadronization. The
measurement of $J/\psi$ suppression can therefore signify the existence of the
critical point unambiguously.


title:
Evidence for a charge collective mode associated with superconductivity
  in copper oxides from neutron and x-ray scattering measurements of
  La$_{2-x}$Sr$_x$CuO$_4$

abstract:
  In superconducting copper oxides some Cu-O bond-stretching phonons around
70meV show anomalous giant softening and broadening of electronic origin and
electronic dispersions have large renormalization kinks near the same energy.
These observations suggest that phonon broadening originates from quasiparticle
excitations across the Fermi surface and the electronic dispersion kinks
originate from coupling to anomalous phonons. We measured the phonon anomaly in
underdoped (x=0.05) and overdoped (x=0.20,0.25) La$_{2-x}$Sr$_x$CuO$_4$ by
inelastic neutron and x-ray scattering with high resolution. Combining these
and previously published data, we found that doping-dependence of the magnitude
of the giant phonon anomaly is very different from that of the ARPES kink, i.e.
the two phenomena are not connected. We show that these results provide
indirect evidence that the phonon anomaly originates from novel collective
charge excitations as opposed to interactions with electron-hole pairs. Their
amplitude follows the superconducting dome so these charge modes may be
important for superconductivity.


title:
A fast, robust, and simple implicit method for adaptive time-stepping on
  adaptive mesh-refinement grids

abstract:
  Implicit solvers present strong limitations when used on supercomputing
facilities and in particular for adaptive mesh-refinement codes. We present a
new method for implicit adaptive time-stepping on adaptive mesh
refinement-grids. We implement it in the radiation hydrodynamics solver we
designed for the RAMSES code for astrophysical purposes and, more particularly,
for protostellar collapse. We briefly recall the radiation hydrodynamics
equations and the adaptive time-stepping methodology used for hydrodynamical
solvers. We then introduce the different types of boundary conditions
(Dirichlet, Neumann, and Robin) that are used at the interface between levels
and present our implementation of the new method in the RAMSES code. The method
is tested against classical diffusion and radiation hydrodynamics tests, after
which we present an application for protostellar collapse. We show that using
Dirichlet boundary conditions at level interfaces is a good compromise between
robustness and accuracy and that it can be used in structure formation
calculations. The gain in computational time over our former unique time step
method ranges from factors of 5 to 50 depending on the level of adaptive
time-stepping and on the problem. We successfully compare the old and new
methods for protostellar collapse calculations that involve highly nonlinear
physics. We have developed a simple but robust method for adaptive
time-stepping of implicit scheme on adaptive mesh-refinement grids. It can be
applied to a wide variety of physical problems that involve diffusion
processes.


title:
Explicit computation of the electrostatic energy for an elliptical
  charged disc

abstract:
  This letter describes a method for obtaining an explicit expression for the
electrostatic energy of a charged elliptical infinitely thin disc. The charge
distribution is assumed to be polynomial. Such explicit values for this energy
are fundamental for assessing the accuracy of boundary element codes. The main
tools used are an extension of Copson's method and a diagonalization, given by
Leppington and Levine, of the single-layer potential operator associated with
the electrostatic potential created by a distribution of charges on the
elliptical disc.


title: Nuclear constraints on the EoS and rotating neutron stars

abstract:
  In this contribution nuclear constraints on the equation of state for a
neutron star are discussed. A combined fit to nuclear masses and charge radii
leads to improved values for the symmetry energy and its derivative at nuclear
saturation density, $S_{\rm{v}}= 31$ MeV and $L=68\pm 8$ MeV. As an application
the sensitivity of some properties of rotating supramassive neutron stars on
the EoS is discussed.


title:
Non-uniform continuity of the semiflow map associated to the porous
  medium equation

abstract:
  We prove that the semiflow map associated to the evolution problem for the
porous medium equation (PME) is real-analytic as a function of the initial data
in $H^s(\mathbb{S})$, $s>7/2,$ at any fixed positive time, but it is not
uniformly continuous. More precisely, we construct two sequences of exact
positive solutions of the PME which at initial time converge to zero in
$H^s(\mathbb{S})$, but such that the limit inferior of the difference of the
two sequences is bounded away from zero in $H^s(\mathbb{S})$ at any later time.


title: Characteristic classes as obstructions to local homogeneity

abstract:
  This note is an extended version of my presentation at the "Focused Research
Workshop on Exterior Di{\S}erential Systems and Lie Theory" held at the Fields
Institute in Toronto, December 9-13, 2013. Some ideas and constructions of this
note crystallized during my communication with Anthony D. Blaom. I am deeply
grateful to him and also to P.J. Olver for his constant help and encouragement.


title:
On the Communication Complexity of Secret Key Generation in the
  Multiterminal Source Model

abstract:
  Communication complexity refers to the minimum rate of public communication
required for generating a maximal-rate secret key (SK) in the multiterminal
source model of Csiszar and Narayan. Tyagi recently characterized this
communication complexity for a two-terminal system. We extend the ideas in
Tyagi's work to derive a lower bound on communication complexity in the general
multiterminal setting. In the important special case of the complete graph
pairwise independent network (PIN) model, our bound allows us to determine the
exact linear communication complexity, i.e., the communication complexity when
the communication and SK are restricted to be linear functions of the
randomness available at the terminals.


title:
Effect of SDW fluctuations on the specific heat jump in iron pnictides
  at a superconducting transition

abstract:
  Measurements of the specific heat jump at the onset of superconducting
transition in the iron-pnictide compounds revealed strong variation of its
magnitude as a function of doping that is peaked near the optimal doping. We
show that this behavior is direct manifestation of the coexistence between
spin-density-wave and superconducting orders and the peak originates from
thermal fluctuations of the spin-density-waves near the end point of the
coexistence phase -- a tetracritical point. Thermal fluctuations result in a
power-law dependence of the specific heat jump that is stronger than the
contribution of mass renormalization due to quantum fluctuations of
spin-density-waves in the vicinity of the putative critical point beneath the
superconducting dome.


title:
Anisotropy expectations for ultra-high-energy cosmic rays with future
  high statistics experiments

abstract:
  UHECRs have attracted a lot of attention due to their challengingly high
energies and their potential value to constrain physical processes and
astrophysical parameters in the most energetic sources of the universe. Current
detectors have failed to detect significant anisotropies which had been
expected to allow source identification. Some indications about the UHECR
composition, which may become heavier at the highest energies, has even put
into question the possibility that such a goal could be achieved soon.
  We investigate the potential value of a new-generation detector, with 10
times larger exposure, to overcome the current situation and make significant
progress in the detection of anisotropies and thus in the study of UHECRs. We
take as an example the expected performances of the JEM-EUSO, assuming a
uniform full-sky coverage with a total exposure of 300,000 km2 sr yr.
  We simulate realistic UHECR sky maps for a wide range of possible
astrophysical scenarios allowed by the current constraints, taking into account
the energy losses and photo-dissociation of the UHECRs, as well as their
deflections by magnetic fields. These sky maps, built for the expected
statistics of JEM-EUSO as well as for the current Auger statistics, as a
reference, are analyzed from the point of view of their intrinsic anisotropies,
using the two-point correlation function. A statistical study of the resulting
anisotropies is performed for each astrophysical scenario, varying the UHECR
source composition and spectrum as well as the source density.
  We find that significant anisotropies are expected to be detected by a
next-generation UHECR detector, for essentially all the astrophysical scenarios
studied, and give precise, quantitative meaning to this statement. Our results
show that a gain of one order of magnitude in exposure would make a significant
difference compared to the existing detectors.


title: $\W_n^+$- and $W_n$-module structures on $U(h)$

abstract:
  Let $\h_n$ be the Cartan subalgebra of the Witt algebras
$\W_n^+=\text{Der}\C[t_1, t_2, ..., t_n]$ and $\W_n=\text{Der}\C[t_1^{\pm
1},t_2^{\pm 1},\cdots,t_n^{\pm1}]$ where $1\le n\le \infty$. In this paper, we
classify the modules over $\W_n^+$ and over $\W_n$ which are free
$U(\h_n)$-modules of rank $1$. These are the $\W_n^+$-modules
$\Omega(\Lambda_{n},a, S) $ for some $\Lambda_n=(\lambda_1,\cdots,\lambda_n)
\in (\C^*)^n, a\in \C$, and $S\subset \{1,2,..., n\}$; and $\W_n$-modules
$\Omega(\Lambda_n,a)$ for some $\Lambda_n\in (\C^*)^n$ and some $a\in \C.$


title: Transformed Composite Sequences for Improved Qubit Addressing

abstract:
  Selective laser addressing of a single atom or atomic ion qubit can be
improved using narrowband composite pulse sequences. We describe a
Lie-algebraic technique to generalize known narrowband sequences and introduce
new sequences related by dilation and rotation of sequence generators. Our
method improves known narrowband sequences by decreasing both the pulse time
and the residual error. Finally, we experimentally demonstrate these composite
sequences using $^{40}$Ca$^+$ ions trapped in a surface-electrode ion trap.


title:
Transiting exoplanets from the CoRoT space mission XXV. CoRoT-27b: a
  massive and dense planet on a short-period orbit

abstract:
  We report the discovery of a massive and dense transiting planet CoRoT-27b on
a 3.58 day orbit around a 4.2 Gyr-old G2 star. The planet candidate was
identified from the CoRoT photometry, and was confirmed as a planet with
ground-based spectroscopy.
  The confirmation of the planet candidate is based on radial velocity
observations combined with imaging to rule out blends. The characterisation of
the planet and its host star is carried out using a Bayesian approach where all
the data (CoRoT photometry, radial velocities, and spectroscopic
characterisation of the star) are used jointly. The Bayesian analysis includes
a study whether the assumption of white normally distributed noise holds for
the CoRoT photometry, and whether the use of a non-normal noise distribution
offers advantages in parameter estimation and model selection.
  CoRoT-27b has a mass of $10.39 \pm 0.55$ $\mathrm{M}_{\rm Jup}$, a radius of
$1.01 \pm 0.04$ $\mathrm{R}_{\rm Jup}$, a mean density of
$12.6_{-1.67}^{+1.92}$ $\mathrm{g\,cm^{-3}}$, and an effective temperature of
$1500 \pm 130$ K. The planet orbits around its host star, a 4.2 Gyr-old G2-star
with a mass $M_{\star}=1.06$ $M_{\odot}$, and a radius $R_{\star}=1.05$
$R_{\odot}$, on a $0.048 \pm 0.007$ AU orbit every 3.58 days. The radial
velocity observations allow us to exclude highly eccentric orbits, namely,
$e<0.065$ with a 99% confidence. Given its high mass and density, theoretical
modelling of CoRoT-27b is demanding. We identify two solutions with heavy
element mass fractions of $0.11\pm0.08$ $\mathrm{M_{\oplus}}$ and $0.07\pm0.06$
$\mathrm{M_{\oplus}}$, but even solutions void of heavy elements cannot be
excluded.
  We carry out a secondary eclipse search from the CoRoT photometry using a
method based on Bayesian model selection, but conclude that the noise level is
too high to detect eclipses shallower than 9% of the transit depth.


title: Exploration vs Exploitation vs Safety: Risk-averse Multi-Armed Bandits

abstract:
  Motivated by applications in energy management, this paper presents the
Multi-Armed Risk-Aware Bandit (MARAB) algorithm. With the goal of limiting the
exploration of risky arms, MARAB takes as arm quality its conditional value at
risk. When the user-supplied risk level goes to 0, the arm quality tends toward
the essential infimum of the arm distribution density, and MARAB tends toward
the MIN multi-armed bandit algorithm, aimed at the arm with maximal minimal
value. As a first contribution, this paper presents a theoretical analysis of
the MIN algorithm under mild assumptions, establishing its robustness
comparatively to UCB. The analysis is supported by extensive experimental
validation of MIN and MARAB compared to UCB and state-of-art risk-aware MAB
algorithms on artificial and real-world problems.


title:
A binary differential evolution algorithm learning from explored
  solutions

abstract:
  Although real-coded differential evolution (DE) algorithms can perform well
on continuous optimization problems (CoOPs), it is still a challenging task to
design an efficient binary-coded DE algorithm. Inspired by the learning
mechanism of particle swarm optimization (PSO) algorithms, we propose a binary
learning differential evolution (BLDE) algorithm that can efficiently locate
the global optimal solutions by learning from the last population. Then, we
theoretically prove the global convergence of BLDE, and compare it with some
existing binary-coded evolutionary algorithms (EAs) via numerical experiments.
Numerical results show that BLDE is competitive to the compared EAs, and
meanwhile, further study is performed via the change curves of a renewal metric
and a refinement metric to investigate why BLDE cannot outperform some compared
EAs for several selected benchmark problems. Finally, we employ BLDE solving
the unit commitment problem (UCP) in power systems to show its applicability in
practical problems.


title: On Symmetric Circuits and Fixed-Point Logics

abstract:
  We study properties of relational structures such as graphs that are decided
by families of Boolean circuits. Circuits that decide such properties are
necessarily invariant to permutations of the elements of the input structures.
We focus on families of circuits that are symmetric, i.e., circuits whose
invariance is witnessed by automorphisms of the circuit induced by the
permutation of the input structure. We show that the expressive power of such
families is closely tied to definability in logic. In particular, we show that
the queries defined on structures by uniform families of symmetric Boolean
circuits with majority gates are exactly those definable in fixed-point logic
with counting. This shows that inexpressibility results in the latter logic
lead to lower bounds against polynomial-size families of symmetric circuits.


title: Non-Markovianity criteria for open system dynamics

abstract:
  A universal definition of non-Markovianity for open systems dynamics is
proposed. It is extended from the classical definition to the quantum realm by
showing that a `transition' from the Markov to the non-Markov regime occurs
when the correlations between the system and the environment, generated by
their joint evolution, can no longer be neglected. The suggested definition is
based on the comparison between measured correlation functions and those built
by assuming that the system is in a Markov regime thus giving a figure of merit
of the error coming from this assumption. It is shown that the knowledge of the
dynamical map and initial condition of the system is not enough to fully
characterise the non-Markovian dynamics of the reduced system. The example of
three exactly solvable models, i.e. decoherence and spontaneous emission of the
qubit in a bosonic bath and decoherence of the photon's polarization induced by
interaction with its spacial degrees of freedom, reveals that previously
proposed Markovianity criteria and measures which are based on dynamical map
analysis fail to recognise non-Markov behaviour.


title: Searching for Elko dark matter spinors at the CERN LHC

abstract:
  The aim of this work is to explore the possibility to discover a fermionic
field with mass dimension one, the Elko field, in the Large Hadron Collider
(LHC). Due to its mass dimension, an Elko can only interact either with
Standard Model (SM) spinors and gauge fields at 1-loop order or at tree level
through a quartic interaction with the Higgs field. In this Higgs portal
scenario, the Elko is a viable candidate to a dark matter constituent which has
been shown to be compatible with relic abundance measurements from WMAP and
direct dark matter--nucleon searches. We propose a search strategy for this
dark matter candidate in the channel $pp \rightarrow l^+ l^- + \not\!\! E_T$ at
the $\sqrt{s}=14$ TeV LHC. We show the LHC potential to discover the Elko
considering a triple Higgs-Elko coupling as small as $\sim 0.5$ after 1
pb$^{-1}$ of integrated luminosity. Some phenomenological consequences of this
new particle and its collider signatures are also discussed.


title:
Linear wave dynamics explains observations attributed to dark-solitons
  in a polariton quantum fluid

abstract:
  We investigate the propagation and scattering of polaritons in a planar GaAs
microcavity in the linear regime under resonant excitation. The propagation of
the coherent polariton wave across an extended defect creates phase and
intensity patterns with identical qualitative features previously attributed to
dark and half-dark solitons of polaritons. We demonstrate that these features
are observed for negligible nonlinearity (i.e., polariton-polariton
interaction) and are, therefore, not sufficient to identify dark and half-dark
solitons. A linear model based on the Maxwell equations is shown to reproduce
the experimental observations.


title: Fast and accurate alignment of long bisulfite-seq reads

abstract:
  Summary: Longer sequencing reads, with at least 200 bases per template are
now common. While traditional aligners have adopted new strategies to improve
the mapping of longer reads, aligners specific to bisulfite-sequencing were
optimized when much shorter reads were the norm. We sought to perform the first
comparison using longer reads to determine which aligners were most accurate
and efficient and to evaluate a novel software tool, bwa-meth, built on a
traditional mapper that supports insertions, deletions and clipped alignments.
We gauge accuracy by comparing the number of on and off-target reads from a
targeted sequencing project and by simulations. Availability and
Implementation: The benchmarking scripts and the bwa-meth software are
available at https://github/com/brentp/bwa-meth/ under the MIT License.


title:
Event Conditional Correlation: Or How Non-Linear Linear Dependence Can
  Be

abstract:
  Entries of datasets are often collected only if an event occurred: taking a
survey, enrolling in an experiment and so forth. However, such partial samples
bias classical correlation estimators. Here we show how to correct for such
sampling effects through two complementary estimators of event conditional
correlation: the correlation of two random variables conditional on a given
event. First, we provide under minimal assumptions proof of consistency and
asymptotic normality for the proposed estimators. Then, through synthetic
examples, we show that these estimators behave well in small-sample and yield
powerful methodologies for non-linear regression as well as dependence testing.
Finally, by using the two estimators in tandem, we explore counterfactual
dependence regimes in a financial dataset. By so doing we show that the
contagion which took place during the 2007--2011 financial crisis cannot be
explained solely by increased financial risk.


title: A method to generate first integrals from infinitesimal symmetries

abstract:
  We propose a method to construct first integrals of a dynamical system,
starting with a given set of independent infinitesimal symmetries. In the case
of two infinitesimal symmetries, a rank two Poisson structure on the ambient
space it is found, such that the vector field that generates the dynamical
system, becomes a Poisson vector field. Moreover, the symplectic leaves and the
Casimir functions of the associated Poisson manifold are characterized.
Explicit conditions that guarantee Hamilton-Poisson realizations of the
dynamical system are also given.


title: Effect of assisted hopping on thermopower in an interacting quantum dot

abstract:
  We investigate the electrical conductance and thermopower of a quantum dot
tunnel coupled to external leads described by an extension of the Anderson
impurity model which takes into account the assisted hopping processes, i.e.,
the occupancy-dependence of the tunneling amplitudes. We provide analytical
understanding based on scaling arguments and the Schrieffer-Wolff
transformation, corroborated by detailed numerical calculations using the
numerical renormalization group (NRG) method. The assisted hopping modifies the
coupling to the two-particle state, which shifts the Kondo exchange coupling
constant and exponentially reduces or enhances the Kondo temperature, breaks
the particle-hole symmetry, and strongly affects the thermopower. We discuss
the gate-voltage and temperature dependence of the transport properties in
various regimes. For a particular value of the assisted hopping parameter we
find peculiar discontinuous behaviour in the mixed-valence regime. Near this
value, we find very high Seebeck coefficient. We show that, quite generally,
the thermopower is a highly sensitive probe of assisted hopping and Kondo
correlations.