title: Principal Component Analysis in an Asymmetric Norm

abstract:
  Principal component analysis (PCA) is a widely used dimension reduction tool
in the analysis of many kind of high-dimensional data. It is used in signal
processing, mechanical engineering, psychometrics, and other fields under
different names. It still bears the same mathematical idea: the decomposition
of variation of a high dimensional object into uncorrelated factors or
components. However, in many of the above applications, one is interested in
capturing the tail variables of the data rather than variation around the mean.
Such applications include weather related event curves, expected shortfalls,
and speeding analysis among others. These are all high dimensional tail objects
which one would like to study in a PCA fashion. The tail character though
requires to do the dimension reduction in an asymmetric norm rather than the
classical $L_2$-type orthogonal projection. We develop an analogue of PCA in an
asymmetric norm. These norms cover both quantiles and expectiles, another tail
event measure. The difficulty is that there is no natural basis, no `principal
components', to the $k$-dimensional subspace found. We propose two definitions
of principal components and provide algorithms based on iterative least
squares. We prove upper bounds on their convergence times, and compare their
performances in a simulation study. We apply the algorithms to a Chinese
weather dataset with a view to weather derivative pricing


title: Optimization Of Cross Domain Sentiment Analysis Using Sentiwordnet

abstract:
  The task of sentiment analysis of reviews is carried out using manually built
/ automatically generated lexicon resources of their own with which terms are
matched with lexicon to compute the term count for positive and negative
polarity. On the other hand the Sentiwordnet, which is quite different from
other lexicon resources that gives scores (weights) of the positive and
negative polarity for each word. The polarity of a word namely positive,
negative and neutral have the score ranging between 0 to 1 indicates the
strength/weight of the word with that sentiment orientation. In this paper, we
show that using the Sentiwordnet, how we could enhance the performance of the
classification at both sentence and document level.


title:
Primitive ideals, twisting functors and star actions for classical Lie
  superalgebras

abstract:
  We study three related topics in representation theory of classical Lie
superalgebras. The first one is classification of primitive ideals, i.e.
annihilator ideals of simple modules, and inclusions between them. The second
topic concerns Arkhipov's twisting functors on the BGG category O. The third
topic addresses deformed orbits of the Weyl group. These take over the role of
the usual Weyl group orbits for Lie algebras, in the study of primitive ideals
and twisting functors for Lie superalgebras.


title: Hierarchies in independence and inclusion logic with strict semantics

abstract:
  We study the expressive power of fragments of inclusion and independence
logic defined by restricting the number k of universal quantifiers in formulas.
Assuming the so-called strict semantics for these logics, we relate these
fragments of inclusion and independence logic to sublogics ESO_f(k\forall) of
existential second-order logic, which in turn are known to capture the
complexity classes NTIME_{RAM}(n^k).


title: Conceptual Design of the International Axion Observatory (IAXO)

abstract:
  The International Axion Observatory (IAXO) will be a forth generation axion
helioscope. As its primary physics goal, IAXO will look for axions or
axion-like particles (ALPs) originating in the Sun via the Primakoff conversion
of the solar plasma photons. In terms of signal-to-noise ratio, IAXO will be
about 4-5 orders of magnitude more sensitive than CAST, currently the most
powerful axion helioscope, reaching sensitivity to axion-photon couplings down
to a few $\times 10^{-12}$ GeV$^{-1}$ and thus probing a large fraction of the
currently unexplored axion and ALP parameter space. IAXO will also be sensitive
to solar axions produced by mechanisms mediated by the axion-electron coupling
$g_{ae}$ with sensitivity $-$for the first time$-$ to values of $g_{ae}$ not
previously excluded by astrophysics. With several other possible physics cases,
IAXO has the potential to serve as a multi-purpose facility for generic axion
and ALP research in the next decade. In this paper we present the conceptual
design of IAXO, which follows the layout of an enhanced axion helioscope, based
on a purpose-built 20m-long 8-coils toroidal superconducting magnet. All the
eight 60cm-diameter magnet bores are equipped with focusing x-ray optics, able
to focus the signal photons into $\sim 0.2$ cm$^2$ spots that are imaged by
ultra-low-background Micromegas x-ray detectors. The magnet is built into a
structure with elevation and azimuth drives that will allow for solar tracking
for $\sim$12 h each day.


title:
Asymptotics of a class of Weil-Petersson geodesics and divergence of
  Weil-Petersson geodesics

abstract:
  We show that the strong asymptotic class of Weil-Petersson (WP) geodesics
with narrow end invariant and bounded annular coefficients is determined by the
forward ending lamination. This generalizes the Recurrent Ending Lamination
Theorem of Brock-Masur-Minsky. As an application we provide a symbolic
condition for divergence of WP geodesic rays in the moduli space.


title: Hierarchies in inclusion logic with lax semantics

abstract:
  We study the expressive power of fragments of inclusion logic under the
so-called lax team semantics. The fragments are defined either by restricting
the number of universal quantifiers or the arity of inclusion atoms in
formulae. In case of universal quantifiers, the corresponding hierarchy
collapses at the first level. Arity hierarchy is shown to be strict by relating
the question to the study of arity hierarchies in fixed point logics.


title: Representation of self-similar Gaussian processes

abstract:
  We develop the canonical Volterra representation for a self-similar Gaussian
process by using the Lamperti transformation of the corresponding stationary
Gaussian process, where this latter one admits a canonical integral
representation under the assumption of pure non-determinism. We apply the
representation obtained for the self-similar Gaussian process to derive an
expression for Gaussian processes that are equivalent in law to the
self-similar Gaussian process in question.


title: The relevance of ontological commitments

abstract:
  In this introductory note, I describe my particular view of the notion of
ontological commitments as honest and pragmatic working hypotheses that assume
the existence (out there) of certain entities represented by the symbols in our
theory. I argue that this is not naive, in the sense that it does not entail
the belief that the hypotheses could ever be proved to be true (or false), but
it is nevertheless justified by the success and predictive power of the theory
that contains the concepts assumed to exist. I also claim that the ontological
commitments one holds (even if tacitly so) have a great influence on what kind
of science is produced, how it is used, and how it is understood. Not only I
justify this claim, but I also propose a sketch of a possible falsification of
it. As a natural conclusion, I defend the importance of identifying, clarifying
and making explicit one's ontological commitments if fruitful scientific
discussions are to be had. Finally, I compare my point of view with that of
some philosophers and scientists who have put forward similar notions.


title: Operator convexity in Krein spaces

abstract:
  We introduce the notion of Krein-operator convexity in the setting of Krein
spaces. We present an indefinite version of the Jensen operator inequality on
Krein spaces by showing that if $(\mathscr{H},J)$ is a Krein space,
$\mathcal{U}$ is an open set which is symmetric with respect to the real axis
such that $\mathcal{U}\cap\mathbb{R}$ consists of a segment of real axis and
$f$ is a Krein-operator convex function on $\mathcal{U}$ with $f(0)=0$, then
\begin{eqnarray*} f(C^{\sharp}AC)\leq^{J}C^{\sharp}f(A)C \end{eqnarray*} for
all $J$-positive operators $A$ and all invertible $J$-contractions $C$ such
that the spectra of $A$, $C^{\sharp}AC$ and $D^{\sharp}AD$ are contained in
$\mathcal{U}$, where $D$ is a defect operator for $C^{\sharp}$.\\ We also show
that in contrast with usual operator convex functions the converse of this
implication is not true, in general.


title:
Single-photon entanglement generation by wavefront shaping in a
  multiple-scattering medium

abstract:
  We demonstrate the control of entanglement of a single photon between several
spatial modes propagating through a strongly scattering medium. Measurement of
the scattering matrix allows the wavefront of the photon to be shaped to
compensate the distortions induced by multiple scattering events. The photon
can thus be directed coherently to a single or multi-mode output. Using this
approach we show how entanglement across different modes can be manipulated
despite the enormous wavefront disturbance caused by the scattering medium.


title:
On the baryon acoustic oscillation amplitude as a probe of radiation
  density

abstract:
  The baryon acoustic oscillation (BAO) feature in the distribution of galaxies
has been widely studied as an excellent standard ruler for probing cosmic
distances and expansion history, and hence dark energy. In contrast, the
amplitude of the BAO feature has received relatively little study, mainly due
to limited signal-to-noise, and complications due to galaxy biasing, effects of
non-linear clustering and dependence on several cosmological parameters. As
expected, the amplitude of the BAO feature is sensitive to the cosmic baryon
fraction: for standard radiation content, the cosmic microwave background (CMB)
acoustic peaks constrain this precisely and the BAO amplitude is largely a
redundant cross-check. However, the CMB mainly constrains the redshift of
matter-radiation equality, z_eq, and the baryon/photon ratio: if a non-standard
radiation density N_eff is allowed, increasing N_eff while matching the CMB
peaks leads to a reduced baryon fraction and a lower relative BAO amplitude. We
construct an observable for the relative area of the BAO feature from the
galaxy correlation function (Eq.~8); from linear-theory models, we find that
this is mainly sensitive to N_eff and quite insensitive to other cosmological
parameters. More detailed work from N-body simulations will be needed to
constrain the effects of non-linearity and scale-dependent galaxy bias on this
observable.


title:
Constraining models of initial state with $v_2$ and $v_3$ data from LHC
  and RHIC

abstract:
  We present a combined analysis of elliptic and triangular flow data from LHC
and RHIC using viscous relativistic hydrodynamics. Elliptic flow $v_2$ in
hydrodynamics is proportional to the participant eccentricity $\varepsilon_2$
and triangular flow is proportional to the participant triangularity
$\varepsilon_3$, which means $v_n=C_n\varepsilon_n$, where $C_n$ is the linear
response coefficient in harmonic n. Experimental data for $v_2$ and $v_3$
combined with hydrodynamic calculations of $C_n$ thus provide us with the rms
values of initial anisotropies $\varepsilon_2$ and $\varepsilon_3$. By varying
free parameters in the hydro calculation (in particular the shear viscosity),
we obtain an allowed band in the (rms $\varepsilon_2$, rms $\varepsilon_3$)
plane. Comparison with Monte-Carlo models of the initial state allows us to
exclude several of these models. We illustrate that the effect of changing the
granularity of the initial state is similar to changing the medium properties,
making these effects difficult to disentangle.


title: Holographic duality in nonlinear hyperbolic metamaterials

abstract:
  According to the holographic principle, the description of a volume of space
can be thought of as encoded on its boundary. Holographic principle establishes
equivalence, or duality, between theoretical description of volume physics,
which involves gravity, and the gravity-free field theory, which describes
physics on its surface. While generally accepted as a theoretical framework, so
far there was no known experimental system which would exhibit explicit
holographic duality and be amenable to direct experimental testing. Here we
demonstrate that nonlinear optics of hyperbolic metamaterials admits such a
dual holographic description. Wave equation which describes propagation of
extraordinary light through the volume of metamaterial exhibits 2+1 dimensional
Lorentz symmetry. The role of time in the corresponding effective 3D Minkowski
spacetime is played by the spatial coordinate aligned with the optical axis of
the material. Nonlinear optical Kerr effect bends this spacetime resulting in
effective gravitational interaction between extraordinary photons. On the other
hand, a holographic dual theory may be formulated on the metamaterial surface,
which describes its nonlinear optics via interaction of cylindrical surface
plasmons possessing conserved charges proportional to their angular momenta.
Potential implications of this duality for superconductivity of hyperbolic
metamaterials are discussed.

categories: physics.optics cond-mat.supr-con gr-qc hep-th


title:
Chirality asymptotic behavior and non-Markovianity in quantum walks on a
  line

abstract:
  We investigate the time evolution of the chirality reduced density matrix for
a discrete-time quantum walk on a one-dimensional lattice, which is obtained by
tracing out the spatial degree of freedom. We analyze the standard case,
without decoherence, and the situation where decoherence appears in the form of
broken links in the lattice. By examining the trace distance for possible pairs
of initial states as a function of time, we conclude that the evolution of the
reduced density matrix is non-Markovian, in the sense defined in [H. P. Breuer,
E. M. Laine, and J. Piilo, Phys. Rev. Lett. 103, 210401 (2009)]. As the level
of noise increases, the dynamics approaches a Markovian process. The highest
non-Markovianity corresponds to the case without decoherence. The reduced
density matrix tends always to a well-defined limit that we calculate, but only
in the decoherence-free case this limit is non-trivial.


title:
On a non-isothermal diffuse interface model for two-phase flows of
  incompressible fluids

abstract:
  We introduce a diffuse interface model describing the evolution of a mixture
of two different viscous incompressible fluids of equal density. The main
novelty of the present contribution consists in the fact that the effects of
temperature on the flow are taken into account. In the mathematical model, the
evolution of the macroscopic velocity is ruled by the Navier-Stokes system with
temperature-dependent viscosity, while the order parameter representing the
concentration of one of the components of the fluid is assumed to satisfy a
convective Cahn-Hilliard equation. The effects of the temperature are
prescribed by a suitable form of the heat equation. However, due to quadratic
forcing terms, this equation is replaced, in the weak formulation, by an
equality representing energy conservation complemented with a differential
inequality describing production of entropy. The main advantage of introducing
this notion of solution is that, while the thermodynamical consistency is
preserved, at the same time the energy-entropy formulation is more tractable
mathematically. Indeed, global-in-time existence for the initial-boundary value
problem associated to the weak formulation of the model is proved by deriving
suitable a-priori estimates and showing weak sequential stability of families
of approximating solutions.


title:
Observation of associated production of a $Z$ boson with a $D$ meson in
  the~forward region

abstract:
  A search for associated production of a $Z$ boson with an open charm meson is
presented using a data sample, corresponding to an integrated luminosity of
$1.0\,\mathrm{fb}^{-`}$ of proton--proton collisions at a centre-of-mass energy
of 7\,TeV, collected by the LHCb experiment. %% Seven candidate events for
associated production of a $Z$ boson with a $D^0$ meson and four candidate
events for a $Z$ boson with a $D^+$ meson are observed with a combined
significance of 5.1standard deviations. The production cross-sections in the
forward region are measured to be $$\sigma_{Z\rightarrow\mu^+\mu^-\!,D^0} =
2.50\pm1.12\pm0.22pb$$ $$\sigma_{Z\rightarrow\mu^+\mu^-\!,D^+} =
0.44\pm0.23\pm0.03pb,$$ where the first uncertainty is statistical and the
second systematic.


title: Berry phase induced dimerization in one-dimensional quadrupolar systems

abstract:
  We investigate the effect of the Berry phase on quadrupoles that occur for
example in the low-energy description of spin models. Specifically we study
here the one-dimensional bilinear-biquadratic spin-one model. An open question
for many years about this model is whether it has a non-dimerized fluctuating
nematic phase. The dimerization has recently been proposed to be related to
Berry phases of the quantum fluctuations. We use an effective low-energy
description to calculate the scaling of the dimerization according to this
theory, and then verify the predictions using large scale density-matrix
renormalization group (DMRG) simulations, giving good evidence that the state
is dimerized all the way up to its transition into the ferromagnetic phase. We
furthermore discuss the multiplet structure found in the entanglement spectrum
of the ground state wave functions.


title: Nucleation process in the Burridge-Knopoff model of earthquakes

abstract:
  Nucleation process of the one-dimensional Burridge-Knopoff model of
earthquakes obeying the rate- and state-dependent friction law is studied both
analytically and numerically. The properties of the nucleation dynamics, the
nucleation lengths and the duration times are examined together with their
continuum limits.


title: Revealing the large nuclear dust structures in NGC 1068 with MIDI/VLTI

abstract:
  To understand the relation between the small "obscuring torus" and dusty
structures at larger scales (5-10 pc) in NGC 1068, we use ESO's Mid-Infrared
Interferometer (MIDI) with the 1.8 m Auxiliary Telescopes to achieve the
necessary spatial resolution (~ 20-100 millarcsec). We use the chromatic phases
in the data to improve the spatial fidelity of the analysis. We present
interferometric data for NGC 1068 obtained in 2007 and 2012. We find no
evidence of source variability. Many (u,v) points show non-zero chromatic
phases indicating significant asymmetries. Gaussian model fitting of the
correlated fluxes and chromatic phases provides a 3-component best fit with
estimates of sizes, temperatures and positions of the components. A large,
warm, off-center component is required at a distance approximately 90 mas to
the north-west at a PA ~ -18 deg. The dust at 5-10 pc in the polar region
contributes 4 times more to the mid-infrared flux at 12 um than the dust
located at the center. This dust may represent the inner wall of a dusty cone.
If similar regions are heated by the direct radiation from the nucleus, then
they will contribute substantially to the classification of many Seyfert
galaxies as Type 2. Such a region is also consistent in other Seyfert galaxies
(the Circinus galaxy, NGC 3783 and NGC 424).


title:
Atomic jet from SMM1 (FIRS1) in Serpens uncovers non-coeval binary
  companion

abstract:
  We report on the detection of an atomic jet associated with the protostellar
source SMM1 (FIRS1) in Serpens. The jet is revealed in [FeII] and [NeII] line
maps observed with Spitzer/IRS, and further confirmed in HiRes IRAC and MIPS
images. It is traced very close to SMM1 and peaks at ~5 arcsec" from the source
at a position angle of $\sim 125 degrees. In contrast, molecular hydrogen
emission becomes prominent at distances > 5" from the protostar and extends at
a position angle of 160 degrees. The morphological differences suggest that the
atomic emission arises from a companion source, lying in the foreground of the
envelope surrounding the embedded protostar SMM1. In addition the molecular and
atomic Spitzer maps disentangle the large scale CO (3-2) emission observed in
the region into two distinct bipolar outflows, giving further support to a
proto-binary source setup. Analysis at the peaks of the [FeII] jet show that
emission arises from warm and dense gas (T ~1000 K, n(electron) 10^5 - 10^6
cm^-3). The mass flux of the jet derived independently for the [FeII] and
[NeII] lines is 10^7 M(sun)/yr, pointing to a more evolved Class~I/II protostar
as the driving source. All existing evidence converge to the conclusion that
SMM1 is a non-coeval proto-binary source.


title: Half-Duplex Relaying for the Multiuser Channel

abstract:
  This work focuses on studying the half-duplex (HD) relaying in the Multiple
Access Relay Channel (MARC) and the Compound Multiple Access Channel with a
Relay (cMACr). A generalized Quantize-and-Forward (GQF) has been proposed to
establish the achievable rate regions. Such scheme is developed based on the
variation of the Quantize-and-Forward (QF) scheme and single block with two
slots coding structure. The results in this paper can also be considered as a
significant extension of the achievable rate region of Half-Duplex Relay
Channel (HDRC). Furthermore, the rate regions based on GQF scheme is extended
to the Gaussian channel case. The scheme performance is shown through some
numerical examples.


title: The chromatic discrepancy of graphs

abstract:
  For a proper vertex coloring $c$ of a graph $G$, let $\varphi_c(G)$ denote
the maximum, over all induced subgraphs $H$ of $G$, the difference between the
chromatic number $\chi(H)$ and the number of colors used by $c$ to color $H$.
We define the chromatic discrepancy of a graph $G$, denoted by $\varphi(G)$, to
be the minimum $\varphi_c(G)$, over all proper colorings $c$ of $G$. If $H$ is
restricted to only connected induced subgraphs, we denote the corresponding
parameter by $\hat{\varphi}(G)$. These parameters are aimed at studying graph
colorings that use as few colors as possible in a graph and all its induced
subgraphs. We study the parameters $\varphi(G)$ and $\hat{\varphi}(G)$ and
obtain bounds on them. We obtain general bounds, as well as bounds for certain
special classes of graphs including random graphs. We provide structural
characterizations of graphs with $\varphi(G) = 0$ and graphs with
$\hat{\varphi}(G) = 0$. We also show that computing these parameters is
NP-hard.


title:
Exact solutions to Elko spinors in spatially flat
  Friedmann-Robertson-Walker spacetimes

abstract:
  In this paper we present exact solutions to the so-called Elko spinors for
three models of expanding universe, namely the de Sitter, linear and the
radiation type evolution. The study was restrict to flat, homogeneous and
isotropic Friedmann-Robertson-Walker backgrounds. Starting with an Elko spinor
we present the solutions for these cases and compared to the case of Dirac
spinors. Besides, an attempt to use Elko spinors as a dark energy candidate in
the cosmological context is investigated.


title:
Critical dynamical heterogeneities close to continuous second-order
  glass transitions

abstract:
  We analyse, using Inhomogenous Mode-Coupling Theory, the critical scaling
behaviour of the dynamical susceptibility at a distance epsilon from continuous
second-order glass transitions. We find that the dynamical correlation length
xi behaves generically as epsilon^{-1/3} and that the upper critical dimension
is equal to six. More surprisingly, we find activated dynamic scaling, where xi
grows with time as [ln(t)]^2 exactly at criticality. All these results suggest
a deep analogy between the glassy behaviour of attractive colloids or randomly
pinned supercooled liquids and that of the Random Field Ising Model.


title: A model capturing novel strand symmetries in bacterial DNA

abstract:
  Chargaff's second parity rule for short oligonucleotides states that the
frequency of any short nucleotide sequence on a strand is approximately equal
to the frequency of its reverse complement on the same strand. Recent studies
have shown that, with the exception of organellar DNA, this parity rule
generally holds for double stranded DNA genomes and fails to hold for
single-stranded genomes. While Chargaff's first parity rule is fully explained
by the Watson-Crick pairing in the DNA double helix, a definitive explanation
for the second parity rule has not yet been determined. In this work, we
propose a model based on a hidden Markov process for approximating the
distributional structure of primitive DNA sequences. Then, we use the model to
provide another possible theoretical explanation for Chargaff's second parity
rule, and to predict novel distributional aspects of bacterial DNA sequences.


title: Runaway massive stars as variable gamma-ray sources

abstract:
  Runaway stars are ejected from their formation sites well within molecular
cores in giant dark clouds. Eventually, these stars can travel through the
molecular clouds, which are highly inhomogeneous. The powerful winds of massive
runaway stars interact with the medium forming bowshocks. Recent observations
and theoretical modelling suggest that these bowshocks emit non-thermal
radiation. As the massive stars move through the inhomogeneous ambient gas the
physical properties of the bowshocks are modified, producing changes in the
non-thermal emission. We aim to compute the non-thermal radiation produced in
the bowshocks of runaway massive stars when travelling through a molecular
cloud. We calculate the non-thermal emission and absorption for two types of
massive runaway stars, an O9I and an O4I, as they move through a density
gradient. We present the spectral energy distributions for the runaway stars
modelled. Additionally, we obtain light curves at different energy ranges. We
find significant variations in the emission over timescales of $\sim$ 1 yr. We
conclude that bowshocks of massive runaway stars, under some assumptions, might
be variable gamma-ray sources, with variability timescales that depend on the
medium density profile. These objects might constitute a population of galactic
gamma-ray sources turning on and off within years.


title: Approximation of a multivariate conditional density

abstract:
  This paper extends the result of Broniatowski and Caron (2013) pertaining to
the asymptotic distribution of a random walk conditioned on its final value as
the number of summands increase. We consider multivariate light-tailed random
walk and present a sharp approximation of long runs conditioned by an average
of a function of its summands as their number tends to infinity.


title: Importance Sampling for multi-constraints rare event probability

abstract:
  Improving Importance Sampling estimators for rare event probabilities
requires sharp approx- imations of the optimal density leading to a nearly
zero-variance estimator. This paper presents a new way to handle the estimation
of the probability of a rare event defined as a finite intersection of subset.
We provide a sharp approximation of the density of long runs of a random walk
condi- tioned by multiples constraints, each of them defined by an average of a
function of its summands as their number tends to infinity.


title: A Boosting Approach to Learning Graph Representations

abstract:
  Learning the right graph representation from noisy, multisource data has
garnered significant interest in recent years. A central tenet of this problem
is relational learning. Here the objective is to incorporate the partial
information each data source gives us in a way that captures the true
underlying relationships. To address this challenge, we present a general,
boosting-inspired framework for combining weak evidence of entity associations
into a robust similarity metric. We explore the extent to which different
quality measurements yield graph representations that are suitable for
community detection. We then present empirical results on both synthetic and
real datasets demonstrating the utility of this framework. Our framework leads
to suitable global graph representations from quality measurements local to
each edge. Finally, we discuss future extensions and theoretical considerations
of learning useful graph representations from weak feedback in general
application settings.


title:
Adiabatic model of $(d,p)$ reactions with explicitly energy-dependent
  non-local potentials

abstract:
  We have developed an approximate way of dealing with explicit
energy-dependence of non-local nucleon optical potentials as used to predict
the $(d,p)$ cross sections within the adiabatic theory. Within this
approximation, the non-local optical potentials have to be evaluated at an
energy shifted from half the incident deuteron energy by the $n-p$ kinetic
energy averaged over the range of the $n-p$ interaction and then treated as an
energy-independent non-local potential. Thus the evaluation of the distorting
potential in the incident channel is reduced to a problem solved in our
previous work in [{\it Phys. Rev. Lett. 110, 112501(2013) and Phys. Rev. C 87,
064610 (2013)}]. We have demonstrated how our new model works for the case of
$^{16}$O$(d,p)^{17}$O, $^{36}$Ar($d,p)^{37}$Ar and $^{40}$Ca$(d,p)^{41}$Ca
reactions and highlighted the need for a detailed understanding of
energy-dependence of non-local potentials. We have also suggested a simple way
of correcting the $d-A$ effective potentials for non-locality when the
underlying energy-dependent non-local nucleon potentials are unknown but
energy-dependent local phenomenological nucleon potentials are available.


title:
Masses of light and heavy mesons in a $U(4)_r \times U(4)_l$ linear
  sigma model

abstract:
  We extend the three-flavor linear sigma model with (axial-)vector mesons to
four flavors. We compute the masses of (pseudo)scalar and (axial-)vector mesons
including open and hidden charmed mesons as well as weak decay constants. The
results are in good agreement with experimental data.


title: General indifference pricing with small transaction costs

abstract:
  We study the utility indifference price of a European option in the context
of small transaction costs. Considering the general setup allowing consumption
and a general utility function at final time T, we obtain an asymptotic
expansion of the utility indifference price as a function of the asymptotic
expansions of the utility maximization problems with and without the European
contingent claim. We use the tools developed in [54] and [48] based on
homogenization and viscosity solutions to characterize these expansions.
Finally we study more precisely the example of exponential utilities, in
particular recovering under weaker assumptions the results of [6].


title: Cooperativity Can Enhance Cellular Signal Detection

abstract:
  Most sensory cells use surface receptors to detect environmental stimuli and
initiate downstream signaling. Cooperative interactions among sensory receptors
is known to play a crucial role in enhancing the sensitivity of biochemical
processes such as oxygen sensing by hemoglobin, but whether cooperativity
enhances the fidelity with which a system with multiple receptors can
accurately and quickly detect a signal is poorly understood. We model the
kinetics of small clusters of receptors in the presence of ligand, where the
receptors act independently or cooperatively. We show that the interaction
strength and how it is coupled to the dynamics influences the macroscopic
observables. Contrary to recent reports, our analysis shows that receptor
cooperativity can increase the signal-to-noise ratio, but this increase depends
on the underlying dynamics of the signaling receptor cluster.


title: Topological Quasi-Group Shifts

abstract:
  In this work we characterize those shift spaces which can support a 1-block
quasi-group operation and show the analogous of Kitchens result: any such shift
is conjugated to a product of a full shift with a finite shift. Moreover, we
prove that every expansive automorphism on a compact zero-dimensional
quasi-group that verifies the medial property, commutativity and has period 2,
is isomorphic to the shift map on a product of a finite quasi-group with a full
shift.


title:
Pin(2)-equivariant KO-theory and intersection forms of spin
  four-manifolds

abstract:
  Using Seiberg-Witten Floer spectrum and Pin(2)-equivariant KO-theory, we
prove new Furuta-type inequalities on the intersection forms of spin cobordisms
between homology $3$-spheres. As an application, we give explicit constrains on
the intersection forms of spin $4$-manifolds bounded by Brieskorn spheres
$\pm\Sigma(2,3,6k\pm1)$. Along the way, we also give an alternative proof of
Furuta-Kametanni's improvement of 10/8-theorem for closed spin-4 manifolds.


title: Evidence for SrHo2O4 and SrDy2O4 as model J1-J2 zig-zag chain materials

abstract:
  Neutron diffraction and inelastic spectroscopy is used to characterize the
magnetic Hamiltonian of SrHo2O4 and SrDy2O4. Through a detailed computation of
the crystal-field levels we find site- dependent anisotropic single-ion
magnetism in both materials and diffraction measurements show the presence of
strong one-dimensional spin correlations. Our measurements indicate that
competing interactions of the zig-zag chain, combined with frustrated
interchain interactions, play a crucial role in stabilizing spin-liquid type
correlations in this series.


title:
Localisation on Sasaki-Einstein manifolds from holomophic functions on
  the cone

abstract:
  We study super Yang-Mills theories on five-dimensional Sasaki-Einstein
manifolds. Using localisation techniques, we find that the contribution from
the vector multiplet to the perturbative partition function can be calculated
by counting holomorphic functions on the associated Calabi-Yau cone. This
observation allows us to use standard techniques developed in the context of
quiver gauge theories to obtain explicit results for a number of examples;
namely $S^5$, $T^{1,1}$, $Y^{7,3}$, $Y^{2,1}$, $Y^{2,0}$, and $Y^{4,0}$. We
find complete agreement with previous results obtained by Qiu and Zabzine using
equivariant indices except for the orbifold limits $Y^{p,0}$ with $p > 1$.


title: On the habitability of exoplanets orbiting Proxima Centauri

abstract:
  We apply a mathematical model for photosynthesis to quantitatively assess the
habitability of a hypothetical planet orbiting Proxima Centauri, inside the so
called habitability zone. Results suggest significant viability for primary
biological productivity, provided living organisms have evolved to reach the
ability of using infrared light for photosynthesis.


title:
Explicit Deformation of Lattice Ideals via Chip Firing Games on Directed
  Graphs

abstract:
  For a finite index sublattice $L$ of the root lattice $A_{n}$, we construct a
deterministic algorithm to deform the lattice ideal $I_L$ to a nearby generic
lattice ideal, answering a question posed by Miller and Sturmfels. Our
algorithm is based on recent results of Perkinson, Perlman and Wilmes
concerning commutative algebraic aspects of chip firing on directed graphs. As
an application of our deformation algorithm, we construct a cellular resolution
of the lattice ideal $I_L$ by degenerating the Scarf complex of its
deformation.


title:
Teaching precursors to data science in introductory and second courses
  in statistics

abstract:
  Statistics students need to develop the capacity to make sense of the
staggering amount of information collected in our increasingly data-centered
world. Data science is an important part of modern statistics, but our
introductory and second statistics courses often neglect this fact. This paper
discusses ways to provide a practical foundation for students to learn to
"compute with data" as defined by Nolan and Temple Lang (2010), as well as
develop "data habits of mind" (Finzer, 2013). We describe how introductory and
second courses can integrate two key precursors to data science: the use of
reproducible analysis tools and access to large databases. By introducing
students to commonplace tools for data management, visualization, and
reproducible analysis in data science and applying these to real-world
scenarios, we prepare them to think statistically in the era of big data.


title: Scale setting in lattice QCD

abstract:
  The principles of scale setting in lattice QCD as well as the advantages and
disadvantages of various commonly used scales are discussed. After listing
criteria for good scales, I concentrate on the main presently used ones with an
emphasis on scales derived from the Yang-Mills gradient flow. For these I
discuss discretisation errors, statistical precision and mass effects. A short
review on numerical results also brings me to an unpleasant disagreement which
remains to be explained.


title:
Charge transfer excitations from excited state Hartree-Fock subsequent
  minimization scheme

abstract:
  Photoinduced charge-transfer processes play a key role for novel photovoltaic
phenomena and devices. Thus, the development of ab initio methods that allow
for an accurate and computationally inexpensive treatment of charge-transfer
excitations is a topic that nowadays attracts a lot of scientific attention. In
this paper we extend an approach recently introduced for the description of
single and double excitations (M. Tassi, I. Theophilou and S. Thanos, Int. J.
Quantum Chem., (113), 690 (2013), M. Tassi, I. Theophilou and S. Thanos, J.
Chem. Phys. (138), 124107 (2013)) to allow for the description of
intermolecular charge-transfer excitations. We describe an excitation where an
electron is transferred from a donor system to an acceptor one, keeping the
excited state orthogonal to the ground state and avoiding variational collapse.
These conditions are achieved by decomposing the space spanned by the
Hartree-Fock (HF) ground state orbitals into four subspaces: The subspace
spanned by the occupied orbitals that are localized in the region of the donor
molecule, the corresponding for the acceptor ones and two more subspaces
containing the virtual orbitals that are localized in the neighborhood of the
donor and the acceptor, respectively. Next, we create a Slater determinant with
a hole in the subspace of occupied orbitals of the donor and a particle in the
virtual subspace of the acceptor. Subsequently we optimize both the hole and
the particle by minimizing the HF energy functional in the corresponding
subspaces. Finally, we test our approach by calculating the lowest
charge-transfer excitation energies for a set of tetracyanoethylene-hydrocarbon
complexes, that have been used earlier as a test set for such kind of
excitations.


title: Contractions of Lie algebras with 2-dimensional generic coadjoint orbits

abstract:
  We determine all the contractions within the class of finite-dimensional real
Lie algebras whose coadjoint orbits have dimensions $\le2$.


title:
A qualitative description of graphs of discontinuous polynomial
  functions

abstract:
  We prove that, if f:R^n\to R satisfies Fr\'echet's functional equation and
f(x_1,...,x_n) is not an ordinary algebraic polynomial in the variables
x_1,...,x_n, then f is unbounded on all non-empty open set U of R^n.
Furthermore, the closure of its graph contains an unbounded open set.


title: Hidden Attacks on Power Grid: Optimal Attack Strategies and Mitigation

abstract:
  Real time operation of the power grid and synchronism of its different
elements require accurate estimation of its state variables. Errors in state
estimation will lead to sub-optimal Optimal Power Flow (OPF) solutions and
subsequent increase in the price of electricity in the market or, potentially
overload and create line outages. This paper studies hidden data attacks on
power systems by an adversary trying to manipulate state estimators. The
adversary gains control of a few meters, and is able to introduce spurious
measurements in them. The paper presents a polynomial time algorithm using
min-cut calculations to determine the minimum number of measurements an
adversary needs to manipulate in order to perform a hidden attack. Greedy
techniques are presented to aid the system operator in identifying critical
measurements for protection to prevent such hidden data attacks. Secure PMU
placement against data attacks is also discussed and an algorithm for placing
PMUs for this purpose is developed. The performances of the proposed algorithms
are shown through simulations on IEEE test cases.


title: Torsion-Gravity for Dirac fields and their effective phenomenology

abstract:
  We will consider the torsional completion of gravity for a background filled
with Dirac matter fields, studying the weak-gravitational non-relativistic
approximation, in view of an assessment about their effective phenomenology: we
discuss how the torsionally-induced non-linear interactions among fermion
fields in this limit are compatible with all experiments, and remarks on the
role of torsion to suggest new physics are given.


title: Einstein's first gravitational field equation 101 years latter

abstract:
  We review and strengthen the arguments given by Einstein to derive his first
gravitational field equation for static fields and show that, although it was
ultimately rejected, it follows from General Relativity (GR) for negligible
pressure. Using this equation and considerations folowing directly from the
equivalence principle (EP), we show how Schwarzschild metric and other vacum
metrics can be obtained immediately. With this results and some basic
principles, we obtain the metric in the general spherically symmetric case and
the corresponding hydrostatic equilibrium equation. For this metrics we obtain
the motion equations in a simple and exact manner that clearly shows the three
sources of difference (implied by various aspects of the EP) with respect to
the Newtonian case and use them to study the classical tests of GR. We comment
on the origin of the problems of Einstein first theory of gravity and discuss
how, by removing it the theory could be made consistent and extended to include
rotations, we also comments on various conceptual issues of GR as the origin of
the gravitational effect of pressure.


title:
A Novel Rate Control Algorithm for Onboard Predictive Coding of
  Multispectral and Hyperspectral Images

abstract:
  Predictive coding is attractive for compression onboard of spacecrafts thanks
to its low computational complexity, modest memory requirements and the ability
to accurately control quality on a pixel-by-pixel basis. Traditionally,
predictive compression focused on the lossless and near-lossless modes of
operation where the maximum error can be bounded but the rate of the compressed
image is variable. Rate control is considered a challenging problem for
predictive encoders due to the dependencies between quantization and prediction
in the feedback loop, and the lack of a signal representation that packs the
signal's energy into few coefficients. In this paper, we show that it is
possible to design a rate control scheme intended for onboard implementation.
In particular, we propose a general framework to select quantizers in each
spatial and spectral region of an image so as to achieve the desired target
rate while minimizing distortion. The rate control algorithm allows to achieve
lossy, near-lossless compression, and any in-between type of compression, e.g.,
lossy compression with a near-lossless constraint. While this framework is
independent of the specific predictor used, in order to show its performance,
in this paper we tailor it to the predictor adopted by the CCSDS-123 lossless
compression standard, obtaining an extension that allows to perform lossless,
near-lossless and lossy compression in a single package. We show that the rate
controller has excellent performance in terms of accuracy in the output rate,
rate-distortion characteristics and is extremely competitive with respect to
state-of-the-art transform coding.


title: More Viable Parameter Space for Leptogenesis

abstract:
  Lepton flavour asymmetries generated at the onset of the oscillations of
sterile neutrinos with masses above the electroweak scale can be large enough
to partly survive washout and to explain the baryon asymmetry of the Universe.
This opens up new regions of parameter space, where Leptogenesis is viable
within the type-I seesaw framework. In particular, we find it possible that the
sterile neutrinos masses are substantially below 10^9 GeV, while not being
degenerate. However, the required reheat temperature that is determined by the
begin of the oscillations lies some orders of magnitude above the sterile
neutrino mass-scale.


title: Bulk scalar field in warped extra dimensional models

abstract:
  This work presents a general formalism to analyze a generic bulk scalar field
in a multiple warped extra-dimensional model with arbitrary number of extra
dimensions. The Kaluza-Klein mass modes along with the self-interaction
couplings are determined and the possibility of having lowest lying KK mode
masses near TeV scale are discussed. Also some numerical values for low-lying
KK modes has been presented showing explicit localization around TeV scale. It
is argued that the appearance of large number of closely spaced KK modes with
enhanced coupling may prompt possible new signatures in collider physics.


title: Groupoid Semantics for Thermal Computing

abstract:
  A groupoid semantics is presented for systems with both logical and thermal
degrees of freedom. We apply this to a syntactic model for encryption, and
obtain an algebraic characterization of the heat produced by the encryption
function, as predicted by Landauer's principle. Our model has a linear
representation theory that reveals an underlying quantum semantics, giving for
the first time a functorial classical model for quantum teleportation and other
quantum phenomena.


title: A Creepy World

abstract:
  Using the mechanics of creep in material sciences as a metaphor, we present a
general framework to understand the evolution of financial, economic and social
systems and to construct scenarios for the future. In a nutshell, highly
non-linear out-of-equilibrium systems subjected to exogenous perturbations tend
to exhibit a long phase of slow apparent stable evolution, which are nothing
but slow maturations towards instabilities, failures and changes of regimes.
With examples from history where a small event had a cataclysmic consequence,
we propose a novel view of the current state of the world via the logical
scenarios that derive, avoiding the traps of an illusionary stability and
simple linear extrapolation. The endogenous scenarios are "muddling along",
"managing through" and "blood red abyss". The exogenous scenarios are "painful
adjustment" and "golden east".


title: Matching groups and gliding systems

abstract:
  With every matching in a graph we associate a group called the matching
group. We study this group using the theory of non-positively curved cubed
complexes. Our approach is formulated in terms of so-called gliding systems.


title: Study of unconfirmed supernovae

abstract:
  We study the nature of 39 unconfirmed supernovae (SNe) from the sky area
covered by Sloan Digital Sky Survey (SDSS) Data Release 8 (DR8), using
available photometric and imaging data and intensive literature search. We
confirm that 21 objects are real SNe, 2 are Galactic stars, 4 are probable SNe
and 12 remain unconfirmed events. The probable types for 4 objects are
suggested: 3 SNe are of probable type Ia and SN 1953H is probable type II SN.
In addition, we identify the host galaxy of SN 1976N and correct the
offsets/coordinates of SNe 1958E, 1972F, and 1976N.


title: Vanishing Higgs Quadratic Divergence in the Scotogenic Model and Beyond

abstract:
  It is shown that the inherent quadratic divergence of the Higgs mass
renormalization of the standard model may be avoided in the well-studied
scotogenic model of radiative neutrino mass as well as other analogous
extensions.


title: An X-ray and Infrared Survey of the Lynds 1228 Cloud Core

abstract:
  The nearby Lynds 1228 (L1228) dark cloud at a distance of ~200 pc is known to
harbor several young stars including the driving sources of the giant HH 199
and HH 200 Herbig-Haro outflows. L1228 has been previously studied at optical,
infrared, and radio wavelengths but not in X-rays. We present results of a
sensitive 37 ks Chandra ACIS-I X-ray observation of the L1228 core region.
Chandra detected 60 X-ray sources, most of which are faint (<40 counts) and
non-variable. Infrared counterparts were identified for 53 of the 60 X-ray
sources using archival data from 2MASS, Spitzer, and WISE. Object classes were
assigned using mid-IR colors for those objects with complete photometry, most
of which were found to have colors consistent with extragalactic background
sources. Seven young stellar object (YSO) candidates were identified including
the class I protostar HH 200-IRS which was detected as a faint hard X-ray
source. No X-ray emission was detected from the luminous protostar HH 199-IRS.
We summarize the X-ray and infrared properties of the detected sources and
provide IR spectral energy distribution modeling of high-interest objects
including the protostars driving the HH outflows.


title: Multipliers on Hilbert Spaces of Dirichlet Series

abstract:
  In this paper, certain classes of Hilbert spaces of Dirichlet series with
weighted norms and their corresponding multiplier algebras will be explored.
For a sequence $\{w_n\}_{n=n_0}^\infty $ of positive numbers, define
  \[\mathcal H^\textbf{w}=\left\{\sum_{n=n_0}^\infty
a_nn^{-s}:\sum_{n=n_0}^\infty |a_n|^2 w_n<\infty\right\}.\] Hedenmalm,
Lindqvist and Seip considered the case in which $w_n\equiv 1$ and classified
the multiplier algebra of $\mathcal H^\textbf{w}$ for this space in \cite
{HLS}. In \cite{M}, McCarthy classified the multipliers on $\mathcal
H^\textbf{w}$ when the weights are given by
  \[w_n=\int_0^\infty n^{-2\sigma}d\mu(\sigma),\] where $\mu$ is a positive
Radon measure with $\{0\}$ in its support and $n_0$ is the smallest positive
integer for which this integral is finite. Similar results will be derived
assuming the weights are multiplicative, rather than given by a measure. In
particular, upper and lower bounds on the operator norms of the multipliers
will be obtained, in terms of their values on certain half planes, on the
Hilbert spaces resulting from these weights. Finally, some number theoretic
weight sequences will be explored and the multiplier algebras of the
corresponding Hilbert spaces determined up to isometric isomorphism, providing
examples where the conclusion of McCarthy's result holds, but under alternate
hypotheses on the weights.


title: Star Formation Relations in Nearby Molecular Clouds

abstract:
  We test some ideas for star formation relations against data on local
molecular clouds. On a cloud by cloud basis, the relation between the surface
density of star formation rate and surface density of gas divided by a
free-fall time, calculated from the mean cloud density, shows no significant
correlation. If a crossing time is substituted for the free-fall time, there is
even less correlation. Within a cloud, the star formation rate volume and
surface densities increase rapidly with the corresponding gas densities, faster
than predicted by models using the free-fall time defined from the local
density. A model in which the star formation rate depends linearly on the mass
of gas above a visual extinction of 8 mag describes the data on these clouds,
with very low dispersion. The data on regions of very massive star formation,
with improved star formation rates based on free-free emission from ionized
gas, also agree with this linear relation.


title:
Updated measurements of exclusive $J/\psi$ and $\psi(2S)$ production
  cross-sections in $pp$ collisions at $\sqrt{s}=7$ TeV

abstract:
  The differential cross-section as a function of rapidity has been measured
for the exclusive production of $J/\psi$ and $\psi(2S)$ mesons in proton-proton
collisions at $\sqrt{s}=7$ TeV, using data collected by the LHCb experiment,
corresponding to an integrated luminosity of 930 pb$^{-1}$. The cross-sections
times branching fractions to two muons having pseudorapidities between 2.0 and
4.5 are measured to be $$\begin{array}{rl} \sigma_{pp\rightarrow
J/\psi\rightarrow{\mu^+}{\mu^-}}(2.0<\eta_{\mu^\pm }<4.5)=&291\pm 7\pm19 {\rm \
pb},\\
\sigma_{pp\rightarrow\psi(2S)\rightarrow{\mu^+}{\mu^-}}(2.0<\eta_{\mu^\pm}<4.5)=&6.5\pm
0.9\pm 0.4 {\rm \ pb},\end{array}$$ where the first uncertainty is statistical
and the second is systematic. The measurements agree with next-to-leading order
QCD predictions as well as with models that include saturation effects.


title:
The Complexity of Partial-observation Stochastic Parity Games With
  Finite-memory Strategies

abstract:
  We consider two-player partial-observation stochastic games on finite-state
graphs where player 1 has partial observation and player 2 has perfect
observation. The winning condition we study are \omega-regular conditions
specified as parity objectives. The qualitative-analysis problem given a
partial-observation stochastic game and a parity objective asks whether there
is a strategy to ensure that the objective is satisfied with probability~1
(resp. positive probability). These qualtitative-analysis problems are known to
be undecidable. However in many applications the relevant question is the
existence of finite-memory strategies, and the qualitative-analysis problems
under finite-memory strategies was recently shown to be decidable in 2EXPTIME.
We improve the complexity and show that the qualitative-analysis problems for
partial-observation stochastic parity games under finite-memory strategies are
EXPTIME-complete; and also establish optimal (exponential) memory bounds for
finite-memory strategies required for qualitative analysis.


title:
Probit models for capture-recapture data subject to imperfect detection,
  individual heterogeneity and misidentification

abstract:
  As noninvasive sampling techniques for animal populations have become more
popular, there has been increasing interest in the development of
capture-recapture models that can accommodate both imperfect detection and
misidentification of individuals (e.g., due to genotyping error). However,
current methods do not allow for individual variation in parameters, such as
detection or survival probability. Here we develop misidentification models for
capture-recapture data that can simultaneously account for temporal variation,
behavioral effects and individual heterogeneity in parameters. To facilitate
Bayesian inference using our approach, we extend standard probit regression
techniques to latent multinomial models where the dimension and zeros of the
response cannot be observed. We also present a novel Metropolis-Hastings within
Gibbs algorithm for fitting these models using Markov chain Monte Carlo. Using
closed population abundance models for illustration, we re-visit a DNA
capture-recapture population study of black bears in Michigan, USA and find
evidence of misidentification due to genotyping error, as well as temporal,
behavioral and individual variation in detection probability. We also estimate
a salamander population of known size from laboratory experiments evaluating
the effectiveness of a marking technique commonly used for amphibians and fish.
Our model was able to reliably estimate the size of this population and
provided evidence of individual heterogeneity in misidentification probability
that is attributable to variable mark quality. Our approach is more
computationally demanding than previously proposed methods, but it provides the
flexibility necessary for a much broader suite of models to be explored while
properly accounting for uncertainty introduced by misidentification and
imperfect detection. In the absence of misidentification, our probit
formulation also provides a convenient and efficient Gibbs sampler for Bayesian
analysis of traditional closed population capture-recapture data.


title:
Detection of Anomalous Crowd Behavior Using Spatio-Temporal
  Multiresolution Model and Kronecker Sum Decompositions

abstract:
  In this work we consider the problem of detecting anomalous spatio-temporal
behavior in videos. Our approach is to learn the normative multiframe pixel
joint distribution and detect deviations from it using a likelihood based
approach. Due to the extreme lack of available training samples relative to the
dimension of the distribution, we use a mean and covariance approach and
consider methods of learning the spatio-temporal covariance in the low-sample
regime. Our approach is to estimate the covariance using parameter reduction
and sparse models. The first method considered is the representation of the
covariance as a sum of Kronecker products as in (Greenewald et al 2013), which
is found to be an accurate approximation in this setting. We propose learning
algorithms relevant to our problem. We then consider the sparse multiresolution
model of (Choi et al 2010) and apply the Kronecker product methods to it for
further parameter reduction, as well as introducing modifications for enhanced
efficiency and greater applicability to spatio-temporal covariance matrices. We
apply our methods to the detection of crowd behavior anomalies in the
University of Minnesota crowd anomaly dataset, and achieve competitive results.


title: Effect of Dzyaloshinskii Moriya interaction on magnetic vortex

abstract:
  The effect of the Dzyaloshinskii Moriya interaction on the vortex in magnetic
microdisk was investigated by micro magnetic simulation based on the Landau
Lifshitz Gilbert equation. Our results show that the DM interaction modifies
the size of the vortex core, and also induces an out of plane magnetization
component at the edge and inside the disk. The DM interaction can destabilizes
one vortex handedness, generate a bias field to the vortex core and couple the
vortex polarity and chirality. This DM-interaction-induced coupling can
therefore provide a new way to control vortex polarity and chirality.


title: G-Systems and Deformation of G-Actions On Rd

abstract:
  Given a (smooth) action of a Lie group G on Rd we construct a DGA whose
Maurer-Cartan elements are in one to one correspondence with some class of
defomations of the (induced) G-action on the ring of formal power series with
coefficients in the ring of smooth functions on Rd. In the final part of this
note we discuss the cohomological obstructions to the existence and to the
uniqueness (in a sense to be clarified) of such deformations.


title: Semifields, relative difference sets, and bent functions

abstract:
  Recently, the interest in semifields has increased due to the discovery of
several new families and progress in the classification problem. Commutative
semifields play an important role since they are equivalent to certain planar
functions (in the case of odd characteristic) and to modified planar functions
in even characteristic. Similarly, commutative semifields are equivalent to
relative difference sets. The goal of this survey is to describe the connection
between these concepts. Moreover, we shall discuss power mappings that are
planar and consider component functions of planar mappings, which may be also
viewed as projections of relative difference sets. It turns out that the
component functions in the even characteristic case are related to negabent
functions as well as to $\mathbb{Z}_4$-valued bent functions.


title:
Search for An Annual Modulation in Three Years of CoGeNT Dark Matter
  Detector Data

abstract:
  Weakly Interacting Massive Particles (WIMPs) are well-established dark matter
candidates. WIMP interactions with sensitive detectors are expected to display
a characteristic annual modulation in rate. We release a dataset spanning 3.4
years of operation from a low-background germanium detector, designed to search
for this signature. A previously reported modulation persists, concentrated in
a region of the energy spectrum populated by an exponential excess of unknown
origin. Its phase and period agree with phenomenological expectations, but its
amplitude is a factor $\sim$4-7 larger than predicted for a standard WIMP
galactic halo. We consider the possibility of a non-Maxwellian local halo
velocity distribution as a plausible explanation, able to help reconcile
recently reported WIMP search anomalies.


title: The intrinsic B-mode polarisation of the Cosmic Microwave Background

abstract:
  We estimate the B-polarisation induced in the Cosmic Microwave Background by
the non-linear evolution of density perturbations. Using the second-order
Boltzmann code SONG, our analysis incorporates, for the first time, all
physical effects at recombination. We also include novel contributions from the
redshift part of the Boltzmann equation and from the bolometric definition of
the temperature in the presence of polarisation. The remaining line-of-sight
terms (lensing and time-delay) have previously been studied and must be
calculated non-perturbatively. The intrinsic B-mode polarisation is present
independent of the initial conditions and might contaminate the signal from
primordial gravitational waves. We find this contamination to be comparable to
a primordial tensor-to-scalar ratio of $r\simeq10^{-7}$ at the angular scale
$\ell\simeq100\,$, where the primordial signal peaks, and $r\simeq 5 \cdot
10^{-5}$ at $\ell\simeq700\,$, where the intrinsic signal peaks. Therefore, we
conclude that the intrinsic B-polarisation from second-order effects is not
likely to contaminate future searches of primordial gravitational waves.


title: Planar stochastic hyperbolic infinite triangulations

abstract:
  Pursuing the approach of Angel & Ray, we introduce and study a family of
random infinite triangulations of the full-plane that satisfy a natural spatial
Markov property. These new random lattices naturally generalize Angel &
Schramm's Uniform Infinite Planar Triangulation (UIPT) and are hyperbolic in
flavor. We prove that they exhibit a sharp exponential volume growth, are
non-Liouville, and that the simple random walk on them has positive speed
almost surely. We conjecture that these infinite triangulations are the local
limits of uniform triangulations whose genus is proportional to the size.


title: Decoherence assisted transport in a dimer system

abstract:
  The dynamics of a dimer coupled to two different environments each in a spin
star configuration under the influence of decoherence is studied. The exact
analytical expression for the transition probability in the dimer system is
obtained for different situations, i.e., independent and correlated
environments. In all cases considered, it is shown that there exist
well-defined ranges of parameters for which decoherent interaction with the
environment assists energy transfer in the dimer system. In particular, we find
that correlated environments can assist energy transfer more efficiently than
separate baths.


title:
Exploring Euclidean Dynamical Triangulations with a Non-trivial Measure
  Term

abstract:
  We investigate a nonperturbative formulation of quantum gravity defined via
Euclidean dynamical triangulations (EDT) with a non-trivial measure term in the
path integral. We are motivated to revisit this older formulation of dynamical
triangulations by hints from renormalization group approaches that gravity may
be asymptotically safe and by the emergence of a semiclassical phase in causal
dynamical triangulations (CDT). We study the phase diagram of this model and
identify the two phases that are well known from previous work: the branched
polymer phase and the collapsed phase. We verify that the order of the phase
transition dividing the branched polymer phase from the collapsed phase is
almost certainly first-order. The nontrivial measure term enlarges the phase
diagram, allowing us to explore a region of the phase diagram that has been
dubbed the crinkled region. Although the collapsed and branched polymer phases
have been studied extensively in the literature, the crinkled region has not
received the same scrutiny. We find that the crinkled region is likely a part
of the collapsed phase with particularly large finite-size effects.
Intriguingly, the behavior of the spectral dimension in the crinkled region at
small volumes is similar to that of CDT, as first reported in arXiv:1104.5505,
but for sufficiently large volumes the crinkled region does not appear to have
4-dimensional semiclassical features. Thus, we find that the crinkled region of
the EDT formulation does not share the good features of the extended phase of
CDT, as we first suggested in arXiv:1104.5505. This agrees with the recent
results of arXiv:1307.2270, in which the authors used a somewhat different
discretization of EDT from the one presented here.


title:
Bounded traveling waves for a thin film with gravity and insoluble
  surfactant

abstract:
  Lubrication equations for a surfactant-driven flow of a thin layer of fluid
are considered with a singular surfactant-dependent surface tension. It is
shown that there exists a bounded traveling wave solution which connects a
fully surfactant-coated film to an uncoated film. The regularity of the
traveling wave depends on whether or not surface diffusion of the insoluble
surfactant is included.


title: An efficient way to assemble finite element matrices in vector languages

abstract:
  Efficient Matlab codes in 2D and 3D have been proposed recently to assemble
finite element matrices. In this paper we present simple, compact and efficient
vectorized algorithms, which are variants of these codes, in arbitrary
dimension, without the use of any lower level language. They can be easily
implemented in many vector languages (e.g. Matlab, Octave, Python, Scilab, R,
Julia, C++ with STL,...). The principle of these techniques is general, we
present it for the assembly of several finite element matrices in arbitrary
dimension, in the P1 finite element case. We also provide an extension of the
algorithms to the case of a system of PDE's. Then we give an extension to
piecewise polynomials of higher order. We compare numerically the performance
of these algorithms in Matlab, Octave and Python, with that in FreeFEM++ and in
a compiled language such as C. Examples show that, unlike what is commonly
believed, the performance is not radically worse than that of C : in the
best/worst cases, selected vector languages are respectively 2.3/3.5 and
2.9/4.1 times slower than C in the scalar and vector cases. We also present
numerical results which illustrate the computational costs of these algorithms
compared to standard algorithms and to other recent ones.


title: Laver's results and low-dimensional topology

abstract:
  In connection with his interest in selfdistributive algebra, Richard Laver
established two deep results with potential applications in low-dimensional
topology, namely the existence of what is now known as the Laver tables and the
well-foundedness of the standard ordering of positive braids. Here we present
these results and discuss the way they could be used in topological
applications.


title: Particle acceleration in sub-cycle optical cells

abstract:
  A single laser pulse with spot size smaller than half its wavelength ($w_0 <
\lambda/2$) can provide a net energy gain to ultra-relativistic particles. In
this paper, we discuss the properties of an optical cell consisting of $N$
sub-cycle pulses that propagate in the direction perpendicular to the electron
motion. We show that the energy gain produced by the cell is proportional to
$N$ and it is sizable even for $\mathcal{O}(1\mathrm{~TW})$ pulses.


title: Selmer groups of elliptic curves in degree $p$ extensions

abstract:
  We study the growth of the Galois invariants of the $p$-Selmer group of an
elliptic curve in a degree $p$ Galois extension. We show that this growth is
determined by certain local cohomology groups and determine necessary and
sufficient conditions for these groups to be trivial. Under certain hypotheses
this allows us to give necessary and sufficient conditions for there to be
growth in the full $p$-Selmer group in a degree $p$ Galois extension.


title: Open Quantum Walks on Graphs

abstract:
  Open quantum walks (OQW) are formulated as quantum Markov chains on graphs.
It is shown that OQWs are a very useful tool for the formulation of dissipative
quantum computing algorithms and for dissipative quantum state preparation. In
particular, single qubit gates and the CNOT-gate are implemented as OQWs on
fully connected graphs. Also, dissipative quantum state preparation of
arbitrary single qubit states and of all two-qubit Bell-states is demonstrated.
Finally, the discrete time version of dissipative quantum computing is shown to
be more efficient if formulated in the language of OQWs.


title:
Simultaneously Magnetic- and Electric-dipole Active Spin Excitations
  Govern the Static Magnetoelectric Effect in Multiferroic Materials

abstract:
  We derive a sum rule to demonstrate that the static magnetoelectric (ME)
effect is governed by optical transitions that are simultaneously excited via
the electric and magnetic components of light. By a systematic analysis of
magnetic point groups, we show that the ME sum rule is applicable to a broad
variety of non-centrosymmetric magnets including ME multiferroic compounds. Due
to the dynamical ME effect, the optical excitations in these materials can
exhibit directional dichroism, i.e. the absorption coefficient can be different
for counter-propagating light beams. According to the ME sum rule, the
magnitude of the linear ME effect of a material is mainly determined by the
directional dichroism of its low-energy optical excitations. Application of the
sum rule to the multiferroic Ba$_2$CoGe$_2$O$_7$, Sr$_2$CoSi$_2$O$_7$ and
Ca$_2$CoSi$_2$O$_7$ shows that in these compounds the static ME effect is
mostly governed by the directional dichroism of the spin-wave excitations in
the GHz-THz spectral range. On this basis, we argue that the studies of
directional dichroism and the application of ME sum rule can promote the
synthesis of new materials with large static ME effect.


title:
On the Design of LIL Tests for (Pseudo) Random Generators and Some
  Experimental Results

abstract:
  NIST SP800-22 (2010) proposes the state of art testing suite for (pseudo)
random generators to detect deviations of a binary sequence from randomness. On
the one hand, as a counter example to NIST SP800-22 test suite, it is easy to
construct functions that are considered as GOOD pseudorandom generators by NIST
SP800-22 test suite though the output of these functions are easily
distinguishable from the uniform distribution. Thus these functions are not
pseudorandom generators by definition. On the other hand, NIST SP800-22 does
not cover some of the important laws for randomness. Two fundamental limit
theorems about random binary strings are the central limit theorem and the law
of the iterated logarithm (LIL). Several frequency related tests in NIST
SP800-22 cover the central limit theorem while no NIST SP800-22 test covers
LIL.
  This paper proposes techniques to address the above challenges that NIST
SP800-22 testing suite faces. Firstly, we propose statistical distance based
testing techniques for (pseudo) random generators to reduce the above mentioned
Type II errors in NIST SP800-22 test suite. Secondly, we propose LIL based
statistical testing techniques, calculate the probabilities, and carry out
experimental tests on widely used pseudorandom generators by generating around
30TB of pseudorandom sequences. The experimental results show that for a sample
size of 1000 sequences (2TB), the statistical distance between the generated
sequences and the uniform distribution is around 0.07 (with $0$ for
statistically indistinguishable and $1$ for completely distinguishable) and the
root-mean-square deviation is around 0.005.


title: Homomorphisms of signed planar graphs

abstract:
  Signed graphs are studied since the middle of the last century. Recently, the
notion of homomorphism of signed graphs has been introduced since this notion
captures a number of well known conjectures which can be reformulated using the
definitions of signed homomorphism.
  In this paper, we introduce and study the properties of some target graphs
for signed homomorphism. Using these properties, we obtain upper bounds on the
signed chromatic numbers of graphs with bounded acyclic chromatic number and of
signed planar graphs with given girth.


title: Riemann-Roch Theory for Graph Orientations

abstract:
  We develop a new framework for investigating linear equivalence of divisors
on graphs using a generalization of Gioan's cycle--cocycle reversal system for
partial orientations. An oriented version of Dhar's burning algorithm is
introduced and employed in the study of acyclicity for partial orientations. We
then show that the Baker--Norine rank of a partially orientable divisor is one
less than the minimum number of directed paths which need to be reversed in the
generalized cycle--cocycle reversal system to produce an acyclic partial
orientation. These results are applied in providing new proofs of the
Riemann--Roch theorem for graphs as well as Luo's topological characterization
of rank-determining sets. We prove that the max-flow min-cut theorem is
equivalent to the Euler characteristic description of orientable divisors and
extend this characterization to the setting of partial orientations.
Furthermore, we demonstrate that $Pic^{g-1}(G)$ is canonically isomorphic as a
$Pic^{0}(G)$-torsor to the equivalence classes of full orientations in the
cycle--cocycle reversal system acted on by directed path reversals. Efficient
algorithms for computing break divisors and constructing partial orientations
are presented.


title:
CP Asymmetries in Three-Body Final States in Charged $D$ Decays & CPT
  Invariance

abstract:
  The study of local \cp \ asymmetry in Dalitz plots of charm (& beauty) decays
gives us more information about the underlying dynamics than the ratio between
total rates. In this paper we explore the consequences of the constraint from
\cpt \ symmetry with emphasis on three-body $D$ decays. We show simulations of
$D^{\pm} \to \pi^{\pm}K^+K^-$ and discuss correlations with measured $D^{\pm}
\to \pi^{\pm}\pi^+ \pi^-$. There are important comments about analysies of
recent LHCb data in \cp\ asymmetries for $B^{\pm}$ decays to three-body final
states.


title: Strong dynamics behind the formation of the $125$ GeV Higgs boson

abstract:
  We consider the scenario, in which the new strong dynamics is responsible for
the formation of the $125$ GeV Higgs boson. The Higgs boson appears as composed
of all known quarks and leptons of the Standard Model. The description of the
mentioned strong dynamics is given using the $\zeta$ - regularization. It
allows to construct the effective theory without ultraviolet divergences, in
which the $1/N_c$ expansion works naturally. It is shown, that in the leading
order of the $1/N_c$ expansion the mass of the composite $h$ - boson is given
by $M_h = m_t/\sqrt{2} \approx 125$ GeV, where $m_t$ is the top - quark mass.


title: Two-particle multichannel systems in a finite volume with arbitrary spin

abstract:
  The quantization condition for two-particle systems with arbitrary number of
two-body open coupled channels, spin, momentum, and masses in a finite volume
with either periodic or twisted boundary conditions is presented. Although
emphasis is placed in cubic volumes, the result holds for asymmetric volumes.
The result is relativistic, holds for all momenta below the three- and
four-particle thresholds, and is exact up to exponential volume corrections
that are governed by L/r, where L is the spatial extent of the volume and r is
the range of the interactions between the particles. For hadronic systems the
range of the interaction is set by the inverse of the pion mass, m_pi, and as a
result the formalism presented is suitable for m_pi L >> 1. The condition
presented is in agreement with all previous studies of two-body systems in a
finite volume. Implications of the formalism for the studies of multichannel
baryon-baryon systems are discussed.


title: Chasing robbers on random geometric graphs---an alternative approach

abstract:
  We study the vertex pursuit game of \emph{Cops and Robbers}, in which cops
try to capture a robber on the vertices of the graph. The minimum number of
cops required to win on a given graph $G$ is called the cop number of $G$. We
focus on $G_{d}(n,r)$, a random geometric graph in which $n$ vertices are
chosen uniformly at random and independently from $[0,1]^d$, and two vertices
are adjacent if the Euclidean distance between them is at most $r$. The main
result is that if $r^{3d-1}>c_d \frac{\log n}{n}$ then the cop number is $1$
with probability that tends to $1$ as $n$ tends to infinity. The case $d=2$ was
proved earlier and independently in \cite{bdfm}, using a different approach.
Our method provides a tight $O(1/r^2)$ upper bound for the number of rounds
needed to catch the robber.


title:
Born-Oppenheimer study of two-component few-particle systems under
  one-dimensional confinement

abstract:
  The energy spectrum, atom-dimer scattering length, and atom-trimer scattering
length for systems of three and four ultracold atoms with $\delta$-function
interactions in one dimension are presented as a function of the relative mass
ratio of the interacting atoms. The Born-Oppenheimer approach is used to treat
three-body ("HHL") systems of one light and two heavy atoms, as well as
four-body ("HHHL") systems of one light and three heavy atoms. Zero-range
interactions of arbitrary strength are assumed between different atoms, but the
heavy atoms are assumed to be noninteracting among themselves. Both fermionic
and bosonic heavy atoms are considered.


title: Important Notes on Lyapunov Exponents

abstract:
  It is shown that the famous Lyapunov exponents cannot be used as the
numerical characteristic for distinguishing different kinds of attractors, such
as the equilibrium point, the limit closed curve, the stable torus and the
strange attractor.


title:
Multifractal Diffusion Entropy Analysis: Optimal Bin Width of
  Probability Histograms

abstract:
  In the framework of Multifractal Diffusion Entropy Analysis we propose a
method for choosing an optimal bin-width in histograms generated from
underlying probability distributions of interest. The method presented uses
techniques of R\'{e}nyi's entropy and the mean squared error analysis to
discuss the conditions under which the error in the multifractal spectrum
estimation is minimal. We illustrate the utility of our approach by focusing on
a scaling behavior of financial time series. In particular, we analyze the
S&P500 stock index as sampled at a daily rate in the time period 1950-2013. In
order to demonstrate a strength of the method proposed we compare the
multifractal $\delta$-spectrum for various bin-widths and show the robustness
of the method, especially for large values of $q$. For such values, other
methods in use, e.g., those based on moment estimation, tend to fail for
heavy-tailed data or data with long correlations. Connection between the
$\delta$-spectrum and R\'{e}nyi's $q$ parameter is also discussed and
elucidated on a simple example of multiscale time series.

categories: q-fin.ST math-ph math.MP physics.data-an


title: The Data Release of the Sloan Digital Sky Survey-II Supernova Survey

abstract:
  This paper describes the data release of the Sloan Digital Sky Survey-II
(SDSS-II) Supernova Survey conducted between 2005 and 2007. Light curves,
spectra, classifications, and ancillary data are presented for 10,258 variable
and transient sources discovered through repeat ugriz imaging of SDSS Stripe
82, a 300 deg2 area along the celestial equator. This data release is comprised
of all transient sources brighter than r~22.5 mag with no history of
variability prior to 2004. Dedicated spectroscopic observations were performed
on a subset of 889 transients, as well as spectra for thousands of transient
host galaxies using the SDSS-III BOSS spectrographs. Photometric
classifications are provided for the candidates with good multi-color light
curves that were not observed spectroscopically. From these observations, 4607
transients are either spectroscopically confirmed, or likely to be, supernovae,
making this the largest sample of supernova candidates ever compiled. We
present a new method for SN host-galaxy identification and derive host-galaxy
properties including stellar masses, star-formation rates, and the average
stellar population ages from our SDSS multi-band photometry. We derive SALT2
distance moduli for a total of 1443 SN Ia with spectroscopic redshifts as well
as photometric redshifts for a further 677 purely-photometric SN Ia candidates.
Using the spectroscopically confirmed subset of the three-year SDSS-II SN Ia
sample and assuming a flat Lambda-CDM cosmology, we determine Omega_M = 0.315
+/- 0.093 (statistical error only) and detect a non-zero cosmological constant
at 5.7 sigmas.


title: 1/N and Loop Corrections in Higher Spin AdS_4/CFT_3 Duality

abstract:
  We consider the question of loop corrections (i.e. 1/N) in the vector
model/higher spin duality following the recent work of Giombi and Klebanov. The
purpose of this paper is to gain further more precise comparison between the
two sides of the duality. For CFTs given by 3d O(N) or U(N) vector models we
evaluate the leading and one loop partition functions in a variety of
geometries. Our calculations are performed in the scheme of collective field
theory which was seen in earlier studies to represent a bulk description of
Vasiliev higher spin theory. The calculations presented provide data for
comparison of small fluctuation determinants giving further evidence for the
one-to-one bulk identification between the bi-local and the AdS picture. They
also offer insight into the identification of coupling constants G and 1/N of
the two descriptions for models based on O(N) symmetry.


title: Nonlinear inverse problem by T-matrix completion. I. Theory

abstract:
  We propose a conceptually new method for solving nonlinear inverse scattering
problems (ISPs) such as are commonly encountered in tomographic ultrasound
imaging, seismology and other applications. The method is inspired by the
theory of nonlocality of physical interactions and utilizes the relevant
formalism. We formulate the ISP as a problem whose goal is to determine an
unknown interaction potential $V$ from external scattering data. Although we
seek a local (diagonally-dominated) $V$ as the solution to the posed problem,
we allow $V$ to be nonlocal at the intermediate stages of iterations. This
allows us to utilize the one-to-one correspondence between $V$ and the T-matrix
of the problem, $T$. Here it is important to realize that not every $T$
corresponds to a diagonal $V$ and we, therefore, relax the usual condition of
strict diagonality (locality) of $V$. An iterative algorithm is proposed in
which we seek $T$ that is (i) compatible with the measured scattering data and
(ii) corresponds to an interaction potential $V$ that is as
diagonally-dominated as possible. We refer to this algorithm as to the
data-compatible T-matrix completion (DCTMC). This paper is Part I in a two-part
series and contains theory only. Numerical examples of image reconstruction in
a strongly nonlinear regime are given in Part II. The method described in this
paper is particularly well suited for very large data sets that become
increasingly available with the use of modern measurement techniques and
instrumentation.


title: Proton polarisabilities from Compton data using Covariant Chiral EFT

abstract:
  We present a fit of the spin-independent electromagnetic polarisabilities of
the proton to low-energy Compton scattering data in the framework of covariant
baryon chiral effective field theory. Using the Baldin sum rule to constrain
their sum, we obtain
$\alpha=[10.6\pm0.25$(stat)$\pm0.2$(Baldin)$\pm0.4$(theory)$]\times10^{-4}$fm$^3$
and $\beta
=[3.2\mp0.25$(stat)$\pm0.2$(Baldin)$\mp0.4$(theory)$]\times10^{-4}$fm$^3$, in
excellent agreement with other chiral extractions of the same quantities.


title: The $(q,\mu,\nu)$-Boson process and $(q,\mu,\nu)$-TASEP

abstract:
  We prove a intertwining relation (or Markov duality) between the
$(q,\mu,\nu)$-Boson process and $(q,\mu,\nu)$-TASEP, two discrete time Markov
chains introduced by Povolotsky. Using this and a variant of the coordinate
Bethe ansatz we compute nested contour integral formulas for expectations of a
family of observables of the $(q,\mu,\nu)$-TASEP when started from step initial
data. We then utilize these to prove a Fredholm determinant formula for
distribution of the location of any given particle.

categories: math.PR cond-mat.stat-mech math-ph math.MP math.QA


title: A Subband-Based SVM Front-End for Robust ASR

abstract:
  This work proposes a novel support vector machine (SVM) based robust
automatic speech recognition (ASR) front-end that operates on an ensemble of
the subband components of high-dimensional acoustic waveforms. The key issues
of selecting the appropriate SVM kernels for classification in frequency
subbands and the combination of individual subband classifiers using ensemble
methods are addressed. The proposed front-end is compared with state-of-the-art
ASR front-ends in terms of robustness to additive noise and linear filtering.
Experiments performed on the TIMIT phoneme classification task demonstrate the
benefits of the proposed subband based SVM front-end: it outperforms the
standard cepstral front-end in the presence of noise and linear filtering for
signal-to-noise ratio (SNR) below 12-dB. A combination of the proposed
front-end with a conventional front-end such as MFCC yields further
improvements over the individual front ends across the full range of noise
levels.


title: The fate and heir of Majorana zero modes in a quantum wire array

abstract:
  Experimental signatures of Majorana zero modes in a single superconducting
quantum wire with spin-orbit coupling have been reported as zero bias peaks in
the tunneling spectroscopy. We study whether these zero modes can persist in an
array of coupled wires, and if not, what their remnant could be. The bulk
exhibits topologically distinct gapped phases and an intervening gapless phase.
Even though the bulk pairing structure is topological, the interaction between
Majorana zero modes and superfluid phases leads to spontaneous time-reversal
symmetry breaking. Consequently, edge supercurrent loops emerge and edge
Majorana fermions are in general gapped out except when the number of chains is
odd, in which case one Majorana fermion survives.


title:
Comprehensive Analysis and Measurement of Frequency-Tuned and
  Impedance-Tuned Wireless Non-Radiative Power Transfer Systems

abstract:
  This paper theoretically and experimentally investigates frequency-tuned and
impedance-tuned wireless non-radiative power transfer (WNPT) systems.
Closed-form expressions for the efficiencies of both systems, as a function of
frequency and system (circuit) parameters, are presented. In the
frequency-tuned system, the operating frequency is adjusted to compensate for
changes in mutual inductance that occur for variations of transmitter and
receiver loop positions. Frequency-tuning is employed for a range of distances
over which the loops are strongly coupled. In contrast, the impedance-tuned
system employs varactor-based matching networks to compensate for changes in
mutual inductance and achieve a simultaneous conjugate impedance match over a
range of distances. The frequency-tuned system is simpler to implement, while
the impedance-tuned system is more complex but can achieve higher efficiencies.
Both of the experimental WNPT systems studied employ resonant shielded loops as
transmitting and receiving devices.


title: Equilibria in multi-player multi-outcome infinite sequential games

abstract:
  We investigate the existence of certain types of equilibria (Nash,
$\varepsilon$-Nash, subgame perfect, $\varepsilon$-subgame perfect,
Pareto-optimal) in multi-player multi-outcome infinite sequential games. We use
two fundamental approaches: one requires strong topological restrictions on the
games, but produces very strong existence results. The other merely requires
some very basic determinacy properties to still obtain some existence results.
Both results are transfer results: starting with the existence of some
equilibria for a small class of games, they allow us to conclude the existence
of some type of equilibria for a larger class.
  To make the abstract results more concrete, we investigate as a special case
infinite sequential games with real-valued payoff functions. Depending on the
class of payoff functions (continuous, upper semi-continuous, Borel) and
whether the game is zero-sum, we obtain various existence results for
equilibria.
  Our results hold for games with two or up to countably many players.


title: Natural models of theories of green points

abstract:
  We explicitly present expansions of the complex field which are models of the
theories of green points in the multiplicative group case and in the case of an
elliptic curve without complex multiplication defined over $\mathbb{R}$. In
fact, in both cases we give families of structures depending on parameters and
prove that they are all models of the theories, provided certain instances of
Schanuel's conjecture or an analogous conjecture for the exponential map of the
elliptic curve hold. In the multiplicative group case, however, the results are
unconditional for generic choices of the parameters.


title:
A Fundamental Theorem for Hypersurfaces in Semi-Riemannian Warped
  Products

abstract:
  We give necessary and sufficient conditions for a semi-Riemannian manifold of
arbitrary signature to be locally isometrically immersed into certain warped
products. Then, we describe a way to use the structure equations of such
immersions to construct foliations of marginally trapped surfaces in a
four-dimensional Lorentzian spacetimes. We point out that, sometimes, Gauss and
Codazzi equations are not sufficient to ensure the existence of a local
isometric immersion of a semi-Riemannian manifold as a hypersurface of another
manifold. We finally give two low-dimensional examples to illustrate our
results.


title:
Synthetic Observations of the Evolution of Starless Cores in a Molecular
  Cloud Simulation: Comparisons with JCMT Data and Predictions for ALMA

abstract:
  Interpreting the nature of starless cores has been a prominent goal in star
formation for many years. In order to characterise the evolutionary stages of
these objects, we perform synthetic observations of a numerical simulation of a
turbulent molecular cloud. We find that nearly all cores that we detect are
associated with filaments and eventually form protostars. We conclude that
observed starless cores which appear Jeans unstable are only marginally larger
than their respective Jeans masses (within a factor of 3). We note single dish
observations such as those performed with the JCMT appear to miss significant
core structure on small scales due to beam averaging. Finally, we predict that
interferometric observations with ALMA Cycle 1 will resolve the important small
scale structure, which has so far been missed by mm-wavelength observations.


title:
Modifications of thick-target model: re-acceleration of electron beams
  by static and stochastic electric fields

abstract:
  We study two modifications of the collisional thick-target model (CTTM) based
on the global and local re-acceleration of non-thermal electrons by static and
stochastic electric fields during their transport from the coronal acceleration
site to the thick-target region in the chromosphere. We concentrate on a
comparison of the non-thermal electron distribution functions, chromospheric
energy deposits, and HXR spectra obtained for both considered modifications
with the CTTM itself. The results were obtained using a relativistic
test-particle approach. We simulated the transport of non-thermal electrons
with a power-law spectrum including the influence of scattering, energy losses,
magnetic mirroring, and also the effects of the electric fields corresponding
to both modifications of the CTTM. We show that both modifications of the CTTM
change the outcome of the chromospheric bombardment in several aspects. The
modifications lead to an increase in chromospheric energy deposit, change of
its spatial distribution, and a substantial increase in the corresponding HXR
spectrum intensity.


title:
Global existence and blow-up phenomena for two-component
  Degasperis-Procesi system and two-component b-family system

abstract:
  This paper is concerned with global existence and blow-up phenomena for
two-component Degasperis-Procesi system and two-component b-family system. The
strategy relies on our observation on new conservative quantities of these
systems. Several new global existence results and a new blowup result of strong
solutions to the two-component Degasperis- Procesi system and the two-component
b-family system are presented by using these new conservative quantities.


title:
Advanced Self-interference Cancellation and Multiantenna Techniques for
  Full-Duplex Radios

abstract:
  In an in-band full-duplex system, radios transmit and receive simultaneously
in the same frequency band at the same time, providing a radical improvement in
spectral efficiency over a half-duplex system. However, in order to design such
a system, it is necessary to mitigate the self-interference due to simultaneous
transmission and reception, which seriously limits the maximum transmit power
of the full-duplex device. Especially, large differences in power levels in the
receiver front-end sets stringent requirements for the linearity of the
transceiver electronics. We present an advanced architecture for a compact
full-duplex multiantenna transceiver combining antenna design with analog and
digital cancellation, including both linear and nonlinear signal processing.


title: Energy-Dependent Light Quenching in CaWO$_4$ Crystals at mK Temperatures

abstract:
  Scintillating CaWO$_4$ single crystals are a promising multi-element target
for rare-event searches and are currently used in the direct Dark Matter
experiment CRESST (Cryogenic Rare Event Search with Superconducting
Thermometers). The relative light output of different particle interactions in
CaWO$_4$ is quantified by Quenching Factors (QFs). These are essential for an
active background discrimination and the identification of a possible signal
induced by weakly interacting massive particles (WIMPs). We present the first
precise measurements of the QFs of O, Ca and W at mK temperatures by
irradiating a cryogenic detector with a fast neutron beam. A clear energy
dependence of the QF of O and, less pronounced, of Ca was observed for the
first time. Furthermore, in CRESST neutron-calibration data a variation of the
QFs among different CaWO$_4$ single crystals was found. For typical CRESST
detectors the QFs in the region-of-interest (10-40$\,$keV) are
$QF_O^{ROI}=(11.2{\pm}0.5)\,$%, $QF_{Ca}^{ROI}=(5.94{\pm}0.49)\,$% and
$QF_W^{ROI}=(1.72{\pm}0.21)\,$%. The latest CRESST data (run32) is reanalyzed
using these fundamentally new results on light quenching in CaWO$_4$ having
moderate influence on the WIMP analysis. Their relevance for future CRESST runs
and for the clarification of previously published results of direct Dark Matter
experiments is emphasized.


title: Volume Renormalization and the Higgs

abstract:
  Traditionally, Quantum Field Theory (QFT) treats particle excitations as
point-like objects, which is the source of ubiquitous divergences. We
demonstrate that a minimal modification of QFT with finite volume particles may
cure QFT of divergences and illuminate the physics behind the mathematical
construct of our theories. The method allows for a non-perturbative treatment
of the free field and self-interacting theories (though extensions to all
interacting field theories might be possible). In particular,
non-perturbatively defined mass is finite. When applied to the standard model
Higgs mechanism, the method implies that a finite range of parameters allows
for creation of a well defined Higgs particle, whose Compton wavelength is
larger than its physical size, in the broken symmetry phase (as small
oscillations around the vacuum). This has profound consequences for Higgs
production at the LHC. The parameter range in which the Higgs excitation with
the mass of 125 GeV behaves as a proper particle is very restricted.


title:
Galaxy Zoo: An independent look at the evolution of the bar fraction
  over the last eight billion years from HST-COSMOS

abstract:
  We measure the redshift evolution of the bar fraction in a sample of 2380
visually selected disc galaxies found in Cosmic Evolution Survey (COSMOS)
Hubble Space Telescope (HST) images. The visual classifications used to
identify both the disc sample and to indicate the presence of stellar bars were
provided by citizen scientists via the Galaxy Zoo: Hubble (GZH) project. We
find that the overall bar fraction decreases by a factor of two, from 22+/-5%
at z=0.4 (tlb = 4.2 Gyr) to 11+/-2% at z=1.0 (tlb = 7.8 Gyr), consistent with
previous analysis. We show that this decrease, of the strong bar fraction in a
volume limited sample of massive disc galaxies [stellar mass limit of
log(Mstar/Msun) > 10.0], cannot be due to redshift dependent biases hiding
either bars or disc galaxies at higher redshifts. Splitting our sample into
three bins of mass we find that the decrease in bar fraction is most prominent
in the highest mass bin, while the lower mass discs in our sample show a more
modest evolution. We also include a sample of 98 red disc galaxies. These
galaxies have a high bar fraction (45+/-5%), and are missing from other COSMOS
samples which used SED fitting or colours to identify high redshift discs. Our
results are consistent with a picture in which the evolution of massive disc
galaxies begins to be affected by slow (secular) internal process at z~1. We
discuss possible connections of the decrease in bar fraction to the redshift,
including the growth of stable disc galaxies, mass evolution of the gas content
in disc galaxies, as well as the mass dependent effects of tidal interactions.