title:
Towards understanding edge localised mode mitigation by resonant
  magnetic perturbations in MAST

abstract:
  Type-I Edge Localised Modes (ELMs) have been mitigated in MAST through the
application of n = 3, 4 and 6 resonant magnetic perturbations (RMPs). For each
toroidal mode number of the non-axisymmetric applied fields, the frequency of
the ELMs has been increased significantly, and the peak heat flux on the
divertor plates reduced commensurately. This increase in ELM frequency occurs
despite a significant drop in the edge pressure gradient, which would be
expected to stabilise the peeling-ballooning modes thought to be responsible
for type-I ELMs. Various mechanisms which could cause a destabilisation of the
peeling-ballooning modes are presented, including pedestal widening, plasma
rotation braking, three dimensional corrugation of the plasma boundary and the
existence of radially extended lobe structures near to the X-point. This leads
to a model aimed at resolving the apparent dichotomy of ELM control, that is to
say ELM suppression occurring due to the pedestal pressure reduction below the
peeling-ballooning stability boundary, whilst the reduction in pressure can
also lead to ELM mitigation, which is ostensibly a destabilisation of
peeling-ballooning modes. In the case of ELM mitigation, the pedestal
broadening, 3d corrugation or lobes near the X-point degrade ballooning
stability so much that the pedestal recovers rapidly to cross the new stability
boundary at lower pressure more frequently, whilst in the case of suppression,
the plasma parameters are such that the particle transport reduces the edge
pressure below the stability boundary which is only mildly affected by
negligible rotation braking, small edge corrugation or short, broad lobe
structures.


title: Thermodynamics for Trajectories of a Mass Point

abstract:
  On the basis of information theory, a new formalism of classical
non-relativistic mechanics of a mass point is proposed. The particle
trajectories of a general dynamical system defined on an (1+n)-dimensional
smooth manifold are treated geometrically as dynamical variables. Statistical
mechanics of particle trajectories are constructed in a classical manner.
Thermodynamic variables are introduced through a partition function based on a
canonical ensemble of trajectories. Within this theoretical framework,
classical mechanics can be interpreted as an equilibrium state of statistical
mechanics. The relationships between classical and quantum mechanics are
discussed from this statistical mechanical viewpoint. The maximum entropy
principle is shown to provide a unified view of both classical and quantum
mechanics.


title:
On the critical phenomena and thermodynamics of charged topological
  dilaton AdS black holes

abstract:
  In this paper, we study the phase structure and equilibrium state space
geometry of charged topological dilaton black holes in $(n+1)$-dimensional
anti-de Sitter spacetime. By considering the pairs of parameters $(P\sim V)$
and $(Q\sim U)$ as variables, we analyze the phase structure and critical
phenomena of black holes and discuss the relation between the two kinds of
critical phenomena. We find that the phase structures and critical phenomena
drastically depend on the cosmological constant $l$ (or the static electric
charge $Q$ of the black holes), dimensionality $n$ and dilaton field $\Phi $.


title:
EUV ionization of pure He nanodroplets: Mass-correlated photoelectron
  imaging, Penning ionization and electron energy-loss spectra

abstract:
  The ionization dynamics of pure He nanodroplets irradiated by EUV radiation
is studied using Velocity-Map Imaging PhotoElectron-PhotoIon COincidence
(VMI-PEPICO) spectroscopy. We present photoelectron energy spectra and angular
distributions measured in coincidence with the most abundant ions He+, He2+,
and He3+. Surprisingly, below the autoionization threshold of He droplets we
find indications for multiple excitation and subsequent ionization of the
droplets by a Penning-like process. At high photon energies we evidence
inelastic collisions of photoelectrons with the surrounding He atoms in the
droplets.


title:
Nonlinear excitation of low-n harmonics in reduced magnetohydrodynamic
  simulations of edge-localized modes

abstract:
  Nonlinear simulations of the early ELM phase based on a typical type-I ELMy
ASDEX Upgrade discharge have been carried out using the reduced MHD code JOREK.
The analysis is focused on the evolution of the toroidal Fourier spectrum. It
is found that during the nonlinear evolution, linearly subdominant low-n
Fourier components, in particular the n = 1, grow to energies comparable with
linearly dominant harmonics. A simple model is developed, based on the idea
that energy is transferred among the toroidal harmonics via second order
nonlinear interaction. The simple model reproduces and explains very well the
early nonlinear evolution of the toroidal spectrum in the JOREK simulations.
Furthermore, it is shown for the n = 1 harmonic, that its spatial structure
changes significantly during the transition from linear to nonlinearly driven
growth. The rigidly growing structure of the linearly barely unstable n = 1
reaches far into the plasma core. In contrast, the nonlinearly driven n = 1 has
a rigidly growing structure localized at the plasma edge, where the dominant
toroidal harmonics driving the n = 1 are maximal and in phase. The presented
quadratic coupling model might explain the recent experimental observation of
strong low-n components in magnetic measurements [Wenninger et al., Non-linear
magnetic perturbations during edge localized modes in TCV dominated by low n
mode components, submitted to Nuclear Fusion].


title: On Approximation of the Backward Stochastic Differential Equation

abstract:
  We consider the problem of approximation of the solution of the backward
stochastic differential equation in the Markovian case. We suppose that the
trend coefficient of the diffusion process depends on some unknown parameter
and the diffusion coefficient of this equation is small. We propose an
approximation of this solution based on the one-step MLE of the unknown
parameter and we show that this approximation is asymptotically efficient in
the asymptotics of "small noise".


title: Evolution of Yukawa Couplings and Quark Flavour Mixings in the 5D MSSM

abstract:
  The evolution equations of the Yukawa couplings and quark mixings are derived
for the one-loop renormalization group equations in the 5D Minimal
Supersymmetric Standard Model on an {$S^1 / Z_2$} orbifold. Different
possibilities for the matter fields are discussed such as the cases of bulk
propagating or brane localised fields. We discuss in both cases the evolution
of the mass ratios and the implications for the mixing angles.


title:
Imaging material properties of biological samples with a Force Feedback
  Microscope

abstract:
  Mechanical properties of biological samples have been imaged with a
\textit{Force Feedback Microscope}. Force, force gradient and dissipation are
measured simultaneously and quantitatively, merely knowing the AFM cantilever
spring constant. Our first results demonstrate that this robust method provides
quantitative high resolution force measurements of the interaction The little
oscillation imposed to the cantilever and the small value of its stiffness
result in a vibrational energy much smaller than the thermal energy, reducing
the interaction with the sample to a minimum. We show that the observed
mechanical properties of the sample depend on the force applied by the tip and
consequently on the sample indentation.
  Moreover, the frequency of the excitation imposed to the cantilever can be
chosen arbitrarily, opening the way to frequency-dependent studies in
biomechanics, sort of spectroscopic AFM investigations.


title:
Toroidal modeling of penetration of the resonant magnetic perturbation
  field

abstract:
  A toroidal, quasi-linear model is proposed to study the penetration dynamics
of the resonant magnetic perturbation (RMP) field into the plasma. The model
couples the linear, fluid plasma response to a toroidal momentum balance
equation, which includes torques induced by both fluid electromagnetic force
and by (kinetic) neoclassical toroidal viscous force. The numerical results for
a test toroidal equilibrium quantify the effects of various physical parameters
on the field penetration and on the plasma rotation braking. The neoclassical
toroidal viscous torque plays a dominant role in certain region of the plasma,
for the RMP penetration problem considered in this work.


title: Excitation spectrum in two-dimensional superfluid 4He

abstract:
  In this work we perform an ab-initio study of an ideal two-dimensional sample
of 4He atoms, a model for 4He films adsorbed on several kinds of substrates.
Starting from a realistic hamiltonian we face the microscopic study of the
excitation phonon-roton spectrum of the system at zero temperature. Our
approach relies on Path Integral Ground State Monte Carlo projection methods,
allowing to evaluate exactly the dynamical density correlation functions in
imaginary time, and this gives access to the dynamical structure factor of the
system S(q,omega), containing information about the excitation spectrum E(q),
resulting in sharp peaks in S(q,omega). The actual evaluation of S(q,omega)
requires the inversion of the Laplace transform in ill-posed conditions, which
we face via the Genetic Inversion via Falsification of Theories technique. We
explore the full density range from the region of spinodal decomposition to the
freezing density, i.e. 0.0321 A^-2 - 0.0658 A^-2. In particular we follow the
density dependence of the excitation spectrum, focusing on the low wave--vector
behavior of E(q), the roton dispersion, the strength of single quasi--particle
peak, Z(q), and the static density response function, chi(q). As the density
increases, the dispersion E(q) at low wave--vector changes from a super-linear
(anomalous dispersion) trend to a sub-linear (normal dispersion) one,
anticipating the crystallization of the system; at the same time the
maxon-roton structure, which is barely visible at low density, becomes well
developed at high densities and the roton wave vector has a strong density
dependence. Connection is made with recent inelastic neutron scattering results
from highly ordered silica nanopores partially filled with 4He.


title: Coding with Encoding Uncertainty

abstract:
  We study the channel coding problem when errors and uncertainty occur in the
encoding process. For simplicity we assume the channel between the encoder and
the decoder is perfect. Focusing on linear block codes, we model the encoding
uncertainty as erasures on the edges in the factor graph of the encoder
generator matrix. We first take a worst-case approach and find the maximum
tolerable number of erasures for perfect error correction. Next, we take a
probabilistic approach and derive a sufficient condition on the rate of a set
of codes, such that decoding error probability vanishes as blocklength tends to
infinity. In both scenarios, due to the inherent asymmetry of the problem, we
derive the results from first principles, which indicates that robustness to
encoding errors requires new properties of codes different from classical
properties.


title:
Final title: "More on domination polynomial and domination root"
  Previous title: "Graphs with domination roots in the right half-plane"

abstract:
  Let $G$ be a simple graph of order n. The domination polynomial of G is the
polynomial D(G,x) =\sum d(G, i)x^i, where d(G,i) is the number of dominating
sets of G of size i. Every root of D(G,x) is called the domination root of G.
It is clear that (0,\infty) is zero free interval for domination polynomial of
a graph. It is interesting to investigate graphs which have complex domination
roots with positive real parts. In this paper, we first investigate complexity
of the domination polynomial at specific points. Then we present and
investigate some families of graphs whose complex domination roots have
positive real part.


title: On Structural Parameterizations for the 2-Club Problem

abstract:
  The NP-hard 2-Club problem is, given an undirected graph G=(V,E) and l\in N,
to decide whether there is a vertex set S\subseteq V of size at least l such
that the induced subgraph G[S] has diameter at most two. We make progress
towards a systematic classification of the complexity of 2-Club with respect to
a hierarchy of prominent structural graph parameters. First, we present the
following tight NP-hardness results: 2-Club is NP-hard on graphs that become
bipartite by deleting one vertex, on graphs that can be covered by three
cliques, and on graphs with domination number two and diameter three. Then, we
consider the parameter h-index of the input graph. This parameter is motivated
by real-world instances and the fact that 2-Club is fixed-parameter tractable
with respect to the larger parameter maximum degree. We present an algorithm
that solves 2-Club in |V|^{f(k)} time with k being the h-index. By showing
W[1]-hardness for this parameter, we provide evidence that the above algorithm
cannot be improved to a fixed-parameter algorithm. Furthermore, the reduction
used for this hardness result can be modified to show that 2-Club is NP-hard if
the input graph has constant degeneracy. Finally, we show that 2-Club is
fixed-parameter tractable with respect to distance to cographs.


title:
Electron-electron interaction correction and magnetoresistance in tilted
  fields in Si-based 2D systems

abstract:
  We study diffusive electron-electron interaction correction to conductivity
by analyzing simultaneously $\rho_{xx}$ and $\rho_{xy}$ for disordered 2D
electron systems in Si in tilted magnetic field. Tilting the field is shown to
be a straightforward tool to disentangle spin and orbital effects. In
particular, by changing the tilt angle we prove experimentally that in the
field range $g\mu_BB>k_BT$ the correction depends on modulus of magnetic field
rather than on its direction, which is expected for a system with isotropic
$g$-factor. In the high-field limit the correction behaves as $\ln (B)$, as
expected theoretically (Lee, Ramakrishnan, Phys. Rev. B{\bf 26}, 4009 (1982)).
Our data prove that the diffusive electron-electron interaction correction to
conductivity is not solely responsible for the huge and temperature dependent
magnetoresistance in parallel field, typically observed in Si-MOSFETs.


title:
Local nonsmooth Lyapunov pairs for first-order evolution differential
  inclusions

abstract:
  The general theory of Lyapunov's stability of first-order differential
inclusions in Hilbert spaces has been studied by the authors in a previous
work. This new contribution focuses on the natural case when the maximally
monotone operator governing the given inclusion has a domain with nonempty
interior. This setting permits to have nonincreasing Lyapunov functions on the
whole trajectory of the solution to the given differential inclusion. It also
allows some more explicit criteria for Lyapunov's pairs. Some consequences to
the viability of closed sets are given, as well as some useful cases relying on
the continuity or/and convexity of the involved functions. Our analysis makes
use of standard tools from convex and variational analysis.


title:
Borel summation of the semi-classical expansion of the partition
  function associated to the Schr\"odinger equation

abstract:
  We prove that the partition function associated to a perturbation of the
semi-classical harmonic oscillator is the Borel sum of its semi-classical
expansion.


title: Solutions of the multiconfiguration Dirac-Fock equations

abstract:
  The multiconfiguration Dirac-Fock (MCDF) model uses a linear combination of
Slater determinants to approximate the electronic $N$-body wave function of a
relativistic molecular system, resulting in a coupled system of nonlinear
eigenvalue equations, the MCDF equations. In this paper, we prove the existence
of solutions of these equations in the weakly relativistic regime. First, using
a new variational principle as well as results of Lewin on the
multiconfiguration nonrelativistic model, and Esteban and S\'er\'e on the
single-configuration relativistic model, we prove the existence of critical
points for the associated energy functional, under the constraint that the
occupation numbers are not too small. Then, this constraint can be removed in
the weakly relativistic regime, and we obtain non-constrained critical points,
i.e. solutions of the multiconfiguration Dirac-Fock equations.


title: Davydov's Solitons in a Homogeneous Nucleotide Chain

abstract:
  Charge transfer in homogeneous nucleotide chains is modeled on the basis of
Holstein Hamiltonian. The path length of Davydov solitons in these chains is
being studied. It is shown that in a dispersionless case, when the soliton
velocity V is small, the path length grows exponentially as V decreases. In
this case the state of a moving soliton is quasisteady. In the presence of
dispersion determined by the dependence $\Omega^2 = \Omega_0^2 + V_0^2\kappa^2$
\, the path length in the region 0 < V < V_0 is equal to infinity. In this case
the phonon environment follows the charge motion. In the region V > V_0 the
soliton motion is accompanied by emission of phonons which leads to a finite
path length of a soliton. The latter tends to infinity as $V \rightarrow V_0 +
0$ and $V \rightarrow \infty$. The presence of dissipation leads to a finite
soliton path length. An equilibrium velocity of soliton in an external electric
field is calculated. It is shown that there is a maximum intensity of an
electric field at which a steady motion of a soliton is possible. The soliton
mobility is calculated for the stable or ohmic brunch.


title:
Frequency tuning, nonlinearities and mode coupling in circular graphene
  resonators

abstract:
  We study circular nanomechanical graphene resonators by means of continuum
elasticity theory, treating them as membranes. We derive dynamic equations for
the flexural mode amplitudes. Due to geometrical nonlinearity these can be
modeled by coupled Duffing equations. By solving the Airy stress problem we
obtain analytic expressions for eigenfrequencies and nonlinear coefficients as
functions of radius, suspension height, initial tension, back-gate voltage and
elastic constants, which we compare with finite element simulations. Using
perturbation theory, we show that it is necessary to include the effects of the
non-uniform stress distribution for finite deflections. This correctly
reproduces the spectrum and frequency tuning of the resonator, including
frequency crossings.


title:
Conductance spectrum and superconducting gap structures observed in
  c-axis FeSe0.3Te0.7/Au junctions

abstract:
  The electric transport properties of superconducting FeSe0.3Te0.7/Au c-axis
(S/N) junctions, fabricated by using Pulsed Laser Deposition technique, have
been investigated in the temperature range of 2 K to the superconducting
transition temperature TC ~ 13.5 K, and in the presence of applied magnetic
fields from 0 to 9 T. A large zero bias conductance peak has always been
observed in the conductance spectra of several batches of junctions. In
addition, we have also found several gap-like features. Using the extended BTK
theory with the currently favored nodeless S+- wave symmetry, our conductance
spectrum can be reproduced quite well in the low bias range with {\Delta}1 = 4
meV, and {\Delta}2 = 6 meV at 2 K. However the experimental conductance
spectrum is substantially below the calculated one in the high bias range.
Furthermore, there is a conductance minimum at about 20 meV, which may be the
reason for the discrepancy.


title: The Continuity of Linear and Sublinear Correspondences Defined on Cones

abstract:
  In this paper, we investigate the continuity of linear and sublinear
correspondences defined on cones in normed spaces. We also generalize some
known results for sublinear correspondences.


title:
Effect of doping on the magnetostructural ordered phase of iron
  arsenides: A comparative study of the resistivity anisotropy in the doped
  BaFe$_2$As$_2$ with doping into three different sites

abstract:
  In order to unravel a role of doping in the iron-based superconductors, we
investigated the in-plane resistivity for BaFe$_2$As$_2$ doped at either of the
three different lattice sites, Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$,
BaFe$_2$(As$_{1-x}$P$_x$)$_2$, and Ba$_{1-x}$K$_x$Fe$_2$As$_2$, focusing on the
doping effect in the low-temperature antiferromagnetic/orthorhombic (AFO)
phase. A major role of doping in the high-temperature paramagnetic/tetragonal
(PT) phase is known to change the Fermi surface by supplying charge carriers or
by exerting chemical pressure. In the AFO phase, we found a clear correlation
between the magnitude of residual resistivity and resistivity anisotropy. This
indicates that the resistivity anisotropy originates from the anisotropic
impurity scattering from dopant atoms. The magnitude of residual resistivity is
also found to be a parameter controlling the suppression rate of AFO ordering
temperature $T_s$. Therefore, the dominant role of doping in the AFO phase is
to introduce disorder to the system, distinct from that in the PT phase.


title:
Phonon-drag magnetothermopower in Rashba spin-split two-dimensional
  electron systems

abstract:
  We study phonon-drag contribution to the thermoelectric power in a
quasi-two-dimensional electron system confined in GaAs/AlGaAs heterostructure
in presence of both Rashba spin-orbit interaction and perpendicular magnetic
field at very low temperature. It is observed that the peaks in the phonon-drag
thermopower split into two when the Rashba spin-orbit coupling constant is
strong. This splitting is a direct consequence of the Rashba spin-orbit
interaction. We show the dependence of phonon-drag thermopower on both magnetic
field and temperature numerically. A power-law dependence of phonon-drag
magnetothermopower on the temperature in the Bloch-Gruneisen regime is found.
We also extract the exponent of the temperature dependence of phonon-drag
thermopower for different parameters like electron density, magnetic field, and
the spin-orbit coupling constant.


title:
Higher harmonics and ac transport from time dependent density functional
  theory

abstract:
  We report on dynamical quantum transport simulations for realistic molecular
devices based on an approximate formulation of time-dependent Density
Functional Theory with open boundary conditions. The method allows for the
computation of various properties of junctions that are driven by alternating
bias voltages. Besides the ac conductance for hexene connected to gold leads
via thiol anchoring groups, we also investigate higher harmonics in the current
for a benzenedithiol device. Comparison to a classical quasi-static model
reveals that quantum effects may become important already for small ac bias and
that the full dynamical simulations exhibit a much lower number of higher
harmonics. Current rectification is also briefly discussed.


title:
Shubnikov de Haas quantum oscillation of the surface states in the
  metallic Bismuth Telluride sheets

abstract:
  Metallic Bi2Te3 crystalline sheets with the room-temperature resistivity of
above 10 m{\Omega} cm were prepared and their magnetoresistive transport was
measured in a field of up to 9 Tesla. The Shubnikov de Haas oscillations were
identified from the secondly-derived magnetoresistance curves. While changing
the angle between the field and normal axis of the sheets, we find that the
oscillation periods present a cosine dependence on the angle. This indicates a
two-dimensional transport due to the surface state. The work reveals a
resolvable surface contribution to the overall conduction even in a metallic
topological insulator.


title: Nilpotent covers and non-nilpotent subsets of finite groups of Lie type

abstract:
  Let $G$ be a finite group, and $c$ an element of $\mathbb{Z}\cup \{\infty\}$.
A subgroup $H$ of $G$ is said to be {\it $c$-nilpotent} if it is nilpotent, and
has nilpotency class at most $c$. A subset $X$ of $G$ is said to be {\it
non-$c$-nilpotent} if it contains no two elements $x$ and $y$ such that the
subgroup $< x,y>$ is $c$-nilpotent. In this paper we study the quantity
$\omega_c(G)$, defined to be the size of the largest non-$c$-nilpotent subset
of $L$.
  In the case that $L$ is a finite group of Lie type, we identify covers of $L$
by $c$-nilpotent subgroups, and we use these covers to construct large
non-$c$-nilpotent sets in $L$. We prove that for groups $L$ of fixed rank $r$,
there exist constants $D_r$ and $E_r$ such that $D_r N \leq \omega_\infty(L)
\leq E_r N$, where $N$ is the number of maximal tori in $L$.
  In the case of groups $L$ with twisted rank 1, we provide exact formulae for
$\omega_c(L)$ for all $c\in\mathbb{Z}\cup \{\infty\}$. If we write $q$ for the
level of the Frobenius endomorphism associated with $L$ and assume that $q>5$,
then $\omega_\infty(G)$ may be expressed as a polynomial in $q$ with
coefficients in $\{0,1\}$.


title:
The tunneling spectra and superconducting gaps observed by using
  scanning tunneling microscope near the grain-boundary of FeSe0.3Te0.7 films

abstract:
  We used STM to study the tunneling spectra of FeSe0.3Te0.7 films with two
orientations of ab-planes and the connection ramp between them. We have
discovered that, using pulse laser deposition (PLD) method, the a- and b-axis
of the FeSe0.3Te0.7 film deposited on Ar-ion-milled Magnesium Oxide (MgO)
substrate are rotated 45 degree with respect to those of MgO, while the a- and
b-axis of the film grown on pristine MgO substrate are parallel to those of
MgO. With photolithography and this technique, we can prepare FeSe0.3Te0.7 film
with two kinds of orientations on the same MgO substrate, and the connection
between them forms a ramp at an angle about 25 degree to the substrate plane.
In the planar region with either 0 degree or 45 degree orientation, we have
observed tunneling spectra with a superconducting gap about 5 meV and 1.78 meV
respectively. However, a much larger gap about 18 meV has been observed in the
ramp region. Furthermore, we have also observed a small zero-bias conductance
peak (ZBCP) inside the large gap at T = 4.3K. The ZBCP becomes smaller and
disappear with increasing temperature to 7 K. The possible causes of such large
gap and the ZBCP will be discussed.


title: Bicategorical homotopy fiber sequences

abstract:
  Small B\'{e}nabou's bicategories and, in particular, Mac Lane's monoidal
categories, have well-understood classifying spaces, which give geometric
meaning to their cells. This paper contains some contributions to the study of
the relationship between bicategories and the homotopy types of their
classifying spaces. Mainly, generalizations are given of Quillen's Theorems A
and B to lax functors between bicategories.


title:
Centrifugal correction to hyperfine structure constants in the ground
  state of lead monofluoride, PbF

abstract:
  The sensitivity of the PbF molecule to the electron electric dipole moment
has motivated detailed microwave spectroscopy. Previous theoretical approaches
cannot fully explain the spectra. In turn, the explanation from "first
principles" is very important both for molecular theory and for confirmation of
the correctness of the interpretation of experimental data obtained with high
precision. All of these issues are decisively addressed here. We have
determined centrifugal correction parameters for hyperfine structure constants,
both on lead and fluorine nuclei, of the $X^2\Pi_{1/2}$ state of lead
monofluoride. These parameters were obtained by fitting experimentally observed
pure rotational transitions and from {\it ab initio} calculations. We show that
taking this correction into account is required to reproduce the experimental
transition energies obtained in [Phys. Rev. A 84, 022508 (2011)].


title:
Refined size estimates for Furstenberg sets via Hausdorff measures: a
  survey of some recent results

abstract:
  In this survey we collect and discuss some recent results on the so called
"Furstenberg set problem", which in its classical form concerns the estimates
of the Hausdorff dimension of planar sets containing, for any direction, a
subset of an interval poitning in that direction of some prescribed dimension.
This problem is closely related to the "Kakeya needle problem". In this work we
approach this problem from a more general point of view, in terms of
generalized Hausdorff measures associated to dimension functions. We generalize
the known results in terms of "logarithmic gaps" and obtain analogues to the
classical estimates. Moreover, these analogues allow us to extend our results
to the zero dimensional endpoint. We also obtain results about the dimension of
a variation of Furstenberg sets defined for a fractal set of directions. We
prove analogous inequalities reflecting the interplay between the size of the
set of directions and the size of each fiber. This problem is also studied in
the general scenario of Hausdorff measures.


title:
Wavelet Based Authentication/Secret Transmission Through Image
  Resizing(WASTIR)

abstract:
  The paper is aimed for a wavelet based steganographic or watermarking
technique in frequency domain termed as WASTIR for secret message or image
transmission or image authentication. Number system conversion of the secret
image by changing radix form decimal to quaternary is the pre-processing of the
technique. Cover image scaling through inverse discrete wavelet transformation
with false Horizontal and vertical coefficients are embedded with quaternary
digits through hash function and a secret key. Experimental results are
computed and compared with the existing steganographic techniques like WTSIC,
Yuancheng Lis Method and Region-Based in terms of Mean Square Error (MSE), Peak
Signal to Noise Ratio (PSNR) and Image Fidelity (IF) which show better
performances in WASTIR.


title:
Small ancestry informative marker panels for complete classification
  between the original four HapMap populations

abstract:
  A protocol for the identification of ancestry informative markers (AIMs) from
genome-wide single nucleotide polymorphism (SNP) data is proposed. The protocol
consists of three main steps: (a) identification of potential positive
selection regions via Fst extremity measurement, (b) SNP screening via
two-stage attribute selection and (c) classification model construction using a
naive Bayes classifier. The two-stage attribute selection is composed of a
newly developed round robin symmetrical uncertainty ranking technique and a
wrapper embedded with a naive Bayes classifier. The protocol has been applied
to the HapMap Phase II data. Two AIM panels, which consist of 10 and 16 SNPs
that lead to complete classification between CEU, CHB, JPT and YRI populations,
are identified. Moreover, the panels are at least four times smaller than those
reported in previous studies. The results suggest that the protocol could be
useful in a scenario involving a larger number of populations.


title: Non-Gaussian Stochastic Gravity

abstract:
  This paper presents a new, non-Gaussian formulation of stochastic gravity by
incorporating the higher moments of the fluctuations of the quantum stress
energy tensor for a free quantum scalar field in a consistent way. A scheme is
developed for obtaining realizations of these fluctuations in terms of the
Wightman function, and the behavior of the fluctuations is investigated. The
resulting probability distribution for fluctuations of the energy density in
Minkowski spacetime is found to be similar to a shifted Gamma distribution.
This distribution features a minimum energy density cutoff at a small negative
value, but a sharp peak in the vicinity of this cutoff such that the total
probability of observing a negative value is approximately 62%, balanced by
correspondingly larger but rarer positive values.


title:
Hybrid modified gravity unifying local tests, galactic dynamics and
  late-time cosmic acceleration

abstract:
  The non-equivalence between the metric and Palatini formalisms of $f(R)$
gravity is an intriguing feature of these theories. However, in the recently
proposed hybrid metric-Palatini gravity, consisting of the superposition of the
metric Einstein-Hilbert Lagrangian with an $f(\cal R)$ term constructed \`{a}
la Palatini, the "true" gravitational field is described by the interpolation
of these two non-equivalent approaches. The theory predicts the existence of a
light long-range scalar field, which passes the local constraints and affects
the galactic and cosmological dynamics. Thus, the theory opens new
possibilities for a unified approach, in the same theoretical framework, to the
problems of dark energy and dark matter, without distinguishing a priori matter
and geometric sources, but taking their dynamics into account under the same
standard.


title: Thermodynamics in Black-hole/CFT Correspondence

abstract:
  The area law of Bekenstein-Hawking entropy of the black hole suggests that
the black hole should have a lower-dimensional holographic description. It has
been found recently that a large class of rotating and charged black holes
could be holographically described a two-dimensional (2D) conformal field
theory (CFT). We show that the universal information of the dual CFT, including
the central charges and the temperatures, is fully encoded in the
thermodynamics laws of both outer and inner horizons. These laws,
characterizing how the black hole responds under the perturbation, allows us to
read different dual pictures with respect to different kinds of perturbations.
The remarkable effectiveness of this thermodynamics method suggest that the
inner horizon could play a key role in the study of holographic description of
the black hole.


title:
The Karyotype Ontology: a computational representation for human
  cytogenetic patterns

abstract:
  The karyotype ontology describes the human chromosome complement as
determined cytogenetically, and is designed as an initial step toward the goal
of replacing the current system which is based on semantically meaningful
strings. This ontology uses a novel, semi-programmatic methodology based around
the tawny library to construct many classes rapidly. Here, we describe our use
case, methodology and the event-based approach that we use to represent
karyotypes.
  The ontology is available at http://www.purl.org/ontolink/karyotype/. The
clojure code is available at http://code.google.com/p/karyotype-clj/.


title: Riemannian Quantum Circuit

abstract:
  Number theory is an abstract mathematical field that has found a fertile
environment for development in theoretical physics. In particular, several
physical systems were related to the zeros of the Riemann-zeta function. In
this work we present the theory of a quantum circuit related to a finite number
of zeros of the Riemann-zeta function. The existence of such circuit will
permit in the future the solution of some number theory problems through the
realization of quantum algorithms based on those zeros.


title: Qi-Wa, a problem that has plagued Chinese scrolls for millenniums

abstract:
  Qi-Wa refers to the up curl on the lengths of handscrolls and hanging
scrolls, which has troubled Chinese artisans and emperors for as long as the
art of painting and calligraphy exists. This warp is unwelcomed not only for
aesthetic reasons, but its potential damage to the fiber and ink. Although it
is generally treated as a part of the cockling and curling due to climate,
mounting procedures, and conservation conditions, we emphasize that the
intrinsic curvature incurred from the storage is in fact the main cause of
Qi-Wa. The Qi-Wa height is determined by experiments to obey scaling relations
with the length, width, curvature, and thickness of the scroll, which are
supported by Molecular Dynamics Simulation and theoretic derivations. This
understanding helps us come up with plausible remedies to mitigate Qi-Wa. All
proposals are tested on real mounted paper and in simulations. Due to the
general nature of this warp, we believe the lessons learnt from studying
ancient Chinese scrolls can be applied to modern technologies such as the
development of flexible electronic paper and computer screen.


title:
One-loop calculation of the oblique S and T parameters within
  strongly-coupled scenarios with a light Higgs-like boson

abstract:
  We present a one-loop calculation of the oblique S and T parameters within
strongly-coupled models of electroweak symmetry breaking with a light
Higgs-like boson. We use a general effective Lagrangian, implementing the
chiral symmetry breaking SU(2)_L x SU(2)_R -> SU(2)_{L+R} with Goldstones,
gauge bosons, the Higgs-like scalar and one multiplet of vector and
axial-vector massive resonance states. The estimation is based on the
short-distance constraints and a dispersive approach. The experimentally
allowed range forces the vector and axial-vector states to be heavy, with
masses above the TeV scale, and suggests that the Higgs-like scalar should have
a WW coupling close to the Standard Model one.


title:
A quantum algorithm for the dihedral hidden subgroup problem based on
  algorithm SV

abstract:
  To accelerate the algorithms for the dihedral hidden subgroup problem, we
present a new algorithm based on algorithm SV(shortest vector). A subroutine is
given to get a transition quantum state by constructing a phase filter
function, then the measurement basis are derived based on the technique for
solving low density subset problem. Finally, the parity of slope is revealed by
the measurements on the transition quantum state. This algorithm takes O(n)
quantum space and O(n^2) classical space, which is superior to existing
algorithms, for a relatively small n(n<6400),it takes (n^0.5)*(log(max aij))^3
computation time, which is superior to 2^(O(n^0.5)).


title: Graviton Signals in Central Production at the LHC

abstract:
  In this paper, we study central production, in the inclusive case, to look
for graviton signals in large extra dimensional model using dilepton and
diphoton channels. We carefully analyze signal and possible Standard Model
background processes and study the feasibility of such new physics searches in
a relatively clean environment as in central production where the proton
fragments are mostly emitted in the forward direction, and there is a clear
rapidity gap between them and the centrally produced system. Our analysis shows
that the LHC with 14 TeV center of mass energy and 100 fb$^{-1}$ (300
fb$^{-1}$) of integrated luminosity can probe the effective gravity scale up to
3.6 TeV (4.4 TeV) in both the dilepton and diphoton channels.


title:
Interference Induced Asymmetric Transmission Through A Monolayer of
  Anisotropic Chiral Metamolecules

abstract:
  We show that asymmetric transmission for linear polarizations can be easily
achieved by a monolayer of anisotropic chiral metamolecules through the
constructive and destructive interferences between the contributions from
anisotropy and chirality. Our analysis is based on the interaction of
electromagnetic waves with the constituent electric and magnetic dipoles of the
metamaterials, and an effective medium formulation. In addition, asymmetric
transmission in amplitude can be effectively controlled by the interference
between spectrally detuned resonances. Our findings shed light on the design of
metamaterials for achieving strong asymmetric transmission.


title: The mass spectrum of the Schwinger model with Matrix Product States

abstract:
  We show the feasibility of tensor network solutions for lattice gauge
theories in Hamiltonian formulation by applying matrix product states
algorithms to the Schwinger model with zero and non-vanishing fermion mass. We
introduce new techniques to compute excitations in a system with open boundary
conditions, and to identify the states corresponding to low momentum and
different quantum numbers in the continuum. For the ground state and both the
vector and scalar mass gaps in the massive case, the MPS technique attains
precisions comparable to the best results available from other techniques.


title:
Mass acquisition of Dirac fermions in Cr-doped topological insulator
  Sb2Te3 films

abstract:
  We introduce time-reversal-symmetry breaking by doping Cr atoms into the
topmost quintuple layer or into the bulk of Sb2Te3 thin films. We find that
even at a high Cr-doping level the Landau level spectrum keeps a good quality,
enabling the first demonstration of deviation of the zero-mode Landau level,
induced by the acquisition of a mass term in the surface states in the presence
of surface or bulk magnetic doping. The magnitude of the mass term in the
surface states increases with increasing Cr-doping level. Our observation
suggests Cr-doped Sb2Te3 is a promising candidate for the realization of the
proposed novel magnetoelectric effects.


title: On dually flat $(\alpha,\beta)$-metrics

abstract:
  In this paper, I will show how to use $\beta$-deformations to deal with dual
flatness of $(\alpha,\beta)$-metrics. It is a natural continuation of the
research on dually flat Randers metrics(see arxiv:1209.1150).
$\beta$-deformations is a new method in Riemann-Finsler geometry, it is
introduced by the author(see arxiv:1209.0845).


title:
Diffractive vector meson production at HERA using holographic AdS/QCD
  wavefunctions

abstract:
  We demonstrate another success of the AdS/QCD correspondence by showing that
an AdS/QCD holographic light-front wavefunction for the $\rho$ meson generates
predictions for the cross-sections of diffractive $\rho$ production that are in
agreement with data collected at the HERA electron-proton collider.


title: A reduction from LWE problem to dihedral coset problem

abstract:
  Learning with Errors (LWE) problems are the foundations for numerous
applications in lattice-based cryptography and are provably as hard as
approximate lattice problems in the worst case. Here we present a reduction
from LWE problem to dihedral coset problem(DCP). We present a quantum algorithm
to generate the input of the two point problem which hides the solution of LWE.
We then give a new reduction from two point problem to dihedral coset problem
on D_{{{({n^{13}})}^{n\log n}}}. Our reduction implicate that any algorithm
solves DCP in subexponential time would lead a quantum algorithm for LWE.


title:
Gyromonotron as an instrument for electron beam cooling in
  accelererators

abstract:
  A gyromonotron is based on energy transformation of the transverse motion of
beam particles into electromagnetic wave radiation. This property is proposed
to be used for electron beam cooling in the accelerator. The energy of the
transverse beam motion is converted into stimulated oscillations of the H111
fundamental mode in the gyromonotron resonator. The H111 mode excitation is the
result of simultaneous excitation of H111 and E010 modes in the resonator of
the given length L, where L is determined by by the start-oscillation condition
for certain values of transit angle {\theta}0 in a monotron. The H111 mode
actually determines the amplitude of the pump mode, which exists at whatever
value of transverse velocities of the beam. We have determined basic
gyromonotron parameters such as the radius R and length L of the resonator, and
the amplitude of the guiding magnetic field Hz for intended radio frequency f1.


title:
Explicit bounds on eigenfunctions and spectral functions on manifolds
  hyperbolic near a point

abstract:
  We derive explicit bounds for the remainder term in the local Weyl law for
locally hyperbolic manifolds, we also give the estimates of the derivative of
this remainder. We use these to obtain explicit bounds for the C^k-norms of the
L^2-normalised eigenfunctions in the case spectrum of the Laplacian is
discrete, e.g. for closed Riemannian manifolds. We also derive bounds for the
local heat trace. Our estimates are purely local and therefore also hold for
any manifold at points near which the metric is locally hyperbolic.


title:
Index definitions for nonlinear IAEs and DAEs: new classifications and
  numerical treatments

abstract:
  The definition of index for differential algebraic equations (DAEs) or
integral algebraic equations (IAEs) in the linear case (time variable) depends
only on the coefficients of integrals or differential operators and the
coefficients of the unknown functions. Is this possible for the nonlinear case?
In this paper we answer this question. In this paper, we generalize the index
notion for the nonlinear case. One of the difficulties for nonlinear case, is
its dependence on the exact solution which motivates us to give an important
warning to whom want to solve DAEs using numerical methods such as Runge-Kutta,
multistep or collocation methods.


title: Diboson production cross section at LHC

abstract:
  This paper presents an overview of the diboson production cross-section
measurements and constraints on anomalous triple-gauge boson couplings
performed by the ATLAS and CMS collaborations using proton-proton collisions
produced at a centre-of-mass energy of sqrt{s} = 7 and 8 TeV at LHC. Results
for all combinations of W, Z and \gamma\ gauge bosons (excluding \gamma\gamma)
are presented with emphasis on the new WZ and ZZ production cross sections
measured by ATLAS at sqrt{s} = 8 TeV and on the new constraints on anomalous
triple-gauge couplings set by CMS in the WW and Z\gamma\ modes.


title: Delay Performance and Mixing Times in Random-Access Networks

abstract:
  We explore the achievable delay performance in wireless random-access
networks. While relatively simple and inherently distributed in nature,
suitably designed queue-based random-access schemes provide the striking
capability to match the optimal throughput performance of centralized
scheduling mechanisms in a wide range of scenarios. The specific type of
activation rules for which throughput optimality has been established, may
however yield excessive queues and delays.
  Motivated by that issue, we examine whether the poor delay performance is
inherent to the basic operation of these schemes, or caused by the specific
kind of activation rules. We derive delay lower bounds for queue-based
activation rules, which offer fundamental insight in the cause of the excessive
delays. For fixed activation rates we obtain lower bounds indicating that
delays and mixing times can grow dramatically with the load in certain
topologies as well.


title:
Fixed Points for E-Asymptotic Contractions and Boyd-Wong Type
  E-Contractions in Uniform Spaces

abstract:
  In this paper we discuss on the fixed points of asymptotic contractions and
Boyd-Wong type contractions in uniform spaces equipped with an E-distance. A
new version of Kirk's fixed point theorem is given for asymptotic contractions
and Boyd-Wong type contractions is investigated in uniform spaces.


title: Geodesic mapping onto K\"ahlerian space of the first kind

abstract:
  In the present paper a generalized K\"ahlerian space $\mathbb{G}\underset 1
{\mathbb{K}}{}_N$ of the first kind is considered, as a generalized Riemannian
space $\mathbb{GR}_N$ with almost complex structure $F^h_i$, that is
covariantly constant with respect to the first kind of covariant derivative.
  Using the non-symmetric metric tensor we find necessary and sufficient
conditions for a geodesic mapping $f:\mathbb{GR}_N\to \mathbb{G}\underset 1
{\mathbb{\bar{K}}}{}_N$ with respect to the four kinds of covariant
derivatives.


title:
Simulated Observations of Young Gravitationally Unstable Protoplanetary
  Discs

abstract:
  The formation and earliest stages of protoplanetary discs remain poorly
constrained by observations. ALMA will soon revolutionise this field.
Therefore, it is important to provide predictions which will be valuable for
the interpretation of future high sensitivity and high angular resolution
observations. Here we present simulated ALMA observations based on radiative
transfer modelling of a relatively massive (0.39 M_solar) self-gravitating disc
embedded in a 10 M_solar dense core, with structure similar to the pre-stellar
core L1544. We focus on simple species and conclude that C17O 3-2, HCO+ 3-2,
OCS 26-25 and H2CO 404-303 lines can be used to probe the disc structure and
kinematics at all scales.


title: Empirical Coordination in a Triangular Multiterminal Network

abstract:
  In this paper, we investigate the problem of the empirical coordination in a
triangular multiterminal network. A triangular multiterminal network consists
of three terminals where two terminals observe two external i.i.d correlated
sequences. The third terminal wishes to generate a sequence with desired
empirical joint distribution. For this problem, we derive inner and outer
bounds on the empirical coordination capacity region. It is shown that the
capacity region of the degraded source network and the inner and outer bounds
on the capacity region of the cascade multiterminal network can be directly
obtained from our inner and outer bounds. For a cipher system, we establish key
distribution over a network with a reliable terminal, using the results of the
empirical coordination. As another example, the problem of rate distortion in
the triangular multiterminal network is investigated in which a distributed
doubly symmetric binary source is available.


title:
Reconstructing exact scalar-tensor cosmologies via conformal
  transformations

abstract:
  We propose a new reconstruction method for scalar--tensor gravity based on
the use of conformal transformations. The new method allows the derivation of a
set of interesting exact cosmological solutions in brans Dicke gravity as well
as other extensions of General Relativity.


title:
Sur l'application des p\'eriodes d'une Variation de Structure de Hodge
  attach\'ee aux familles d'hypersurfaces \'a singularit\'es simples

abstract:
  Let $n$ be a positive even integer and $d$ a positive integer . To every
complete family $Z$ of n dimensional degree d hypersurfaces in the projective
space with isolated A-D-E singularities we construct according to an idea of
Carlson-Toledo a Deligne-Mumford stack $\bar Z$ whose moduli space is $Z$ such
that the monodromy representation extends. We study the corresponding periods
mapping and establish an infinitesimal Torelli theorem along the isosingular
strata of lZ$ under transversality assumptions. We apply this result to prove
Steiness of the universal covering space of $\bar Z$.


title:
Entangled Mechanical Cat States via Conditional Single Photon
  Optomechanics

abstract:
  We study single photon optomechanics conditioned on photon counting events.
By selecting only detection events that occur long after a photon pulse arrives
at the cavity, the optomechanical interaction time can be increased, allowing a
large momentum kick to be applied to the oscillator. We apply this to two
optomechanical cavities set up within a Mach-Zhender interferometer driven by a
single photon source. The conditional state of the mechanical modes in such a
system becomes an entangled cat state for detection times resulting in maximum
mechanical amplitude in phase space. Further we study the dynamics induced by a
second photon pulse injected into an already conditioned optomechanical cavity,
a quarter of a mechanical period after the first photon has been detected. We
illustrate how the optomechanical interaction resulting from the second photon
can be strongly suppressed allowing conditional optomechanical routing of
single photons with single photon control pulses.


title: The Projected Faces Property and Polyhedral Relations

abstract:
  Margot (1994) in his doctoral dissertation studied extended formulations of
combinatorial polytopes that arise from "smaller" polytopes via some
composition rule. He introduced the "projected faces property" of a polytope
and showed that this property suffices to iteratively build extended
formulations of composed polytopes.
  For the composed polytopes, we show that an extended formulation of the type
studied in this paper is always possible only if the smaller polytopes have the
projected faces property. Therefore, this produces a characterization of the
projected faces property.
  Affinely generated polyhedral relations were introduced by Kaibel and
Pashkovich (2011) to construct extended formulations for the convex hull of the
images of a point under the action of some finite group of reflections. In this
paper we prove that the projected faces property and affinely generated
polyhedral relation are equivalent conditions.


title:
Second harmonic nano-particles for femtosecond coherent control on the
  nanoscale

abstract:
  We provide a complete toolkit for coherent control experiments on the
nano-scale. By exploiting the second harmonic emission from single (150 nm)
nonlinear nano-particles, we show that ultrafast femtosecond laser pulses can
be compressed and controlled in time with unprecedented spatial accuracy. The
method is tested on various nano-particles of different sizes, shapes and
materials, both dielectric BaTiO3, Fe(IO3)3) and metallic (Au) thus
demonstrating its robustness and versatility.


title: Lifshitz to AdS flow with interpolating p-brane solutions

abstract:
  In continuation with our studies of Lifshitz like D$p$-brane solutions, we
propose a class of 1/4 BPS supersymmetric interpolating solutions which
interpolate between IR Lifshitz solutions and UV AdS solutions smoothly. We
demonstrate properties of these classical solutions near the two fixed points.
These interpolating solutions are then used to calculate the entanglement
entropies of strip-like subsystems. With these bulk solutions the entropy
functional also gets modified. We also make a curious observation about the
electric-magnetic duality and the thermal entropy of the Hodge-dual Lifshitz
D$p$ brane systems.


title:
The semiclassical Maupertuis-Jacobi correspondence for quasi-periodic
  Hamiltonian flows: stable and unstable spectra

abstract:
  We investigate semi-classical properties of Maupertuis-Jacobi correspondence
in 2-D for families of Hamiltonians $(H_\lambda(x,\xi), {\cal
H}_\lambda(x,\xi))$, when ${\cal H}_\lambda(x,\xi)$ is the perturbation of
completely integrable Hamiltonian $\widetilde{\cal H}$ veriying some
isoenergetic non-degeneracy conditions. Assuming the Weyl $h$-PDO $H^w_\lambda$
has only discrete spectrum near $E$, and the energy surface $\{\widetilde{\cal
H}={\cal E}\}$ is separated by some pairwise disjoint lagrangian tori, we show
that most of eigenvalues for $\hat H_\lambda$ near $E$ are asymptotically
degenerate as $h\to0$. This applies in particular for the determination of
trapped modes by an island, in the linear theory of water-waves. We also
consider quasi-modes localized near rational tori. Finally, we discuss breaking
of Maupertuis-Jacobi correspondence on the equator of Katok sphere.


title: Polariton transport in one-dimensional channels

abstract:
  We study theoretically the transport of linearly polarized exciton-polaritons
in a quasi one-dimensional microcavity channel separating two polariton
condensates generated by optical pumping. The direction and value of mass and
spin currents are controlled by the relative phase and polarisation of two
condensates, as in the stationary Josephson effect. However, due to dissipation
and particle-particle interactions, the current denisty is inhomogeneous: it
strongly depends on the coordinate along the axis of the channel. A stationary
spin domain can be created in the channel, its position would be sensitive to
the phase difference between two bordering condensates.


title: Two-dimensional melting under quenched disorder

abstract:
  We study the influence of quenched disorder on the two-dimensional melting
behavior by using both video-microscopy of superparamagnetic colloidal
particles and computer simulations of repulsive parallel dipoles. Quenched
disorder is provided by pinning a fraction of the particles. We confirm the
occurrence of the Kosterlitz-Thouless-Halperin-Nelson-Young scenario with an
intermediate hexatic phase. While the fluid-hexatic transition remains largely
unaffected by disorder, the hexatic-solid transition shifts towards lower
temperatures for increasing disorder resulting in a significantly broadened
stability range of the hexatic phase. In addition, we observe spatio-temporal
critical(-like) fluctuations consistent with the continuous character of the
phase transitions.


title: Motion in a symmetric potential on the hyperbolic plane

abstract:
  We study the motion of a particle in the hyperbolic plane (embedded in
Minkowski space), under the action of a potential that depends only on one
variable. This problem is the analogous to the spherical pendulum in a
unidirectional force field. However, for the discussion of the hyperbolic plane
one has to distinguish three inequivalent cases, depending on the direction of
the force field. Symmetry reduction, with respect to groups that are not neces-
sarily compact or even reductive, is carried out by way of Poisson varieties
and Hilbert maps. For each case the dynamics is discussed, with special
attention to linear potentials.


title: Background simulations for the Large Area Detector onboard LOFT

abstract:
  The Large Observatory For X-ray Timing (LOFT), currently in an assessment
phase in the framework the ESA M3 Cosmic Vision programme, is an innovative
medium-class mission specifically designed to answer fundamental questions
about the behaviour of matter, in the very strong gravitational and magnetic
fields around compact objects and in supranuclear density conditions. Having an
effective area of ~10 m^2 at 8 keV, LOFT will be able to measure with high
sensitivity very fast variability in the X-ray fluxes and spectra. A good
knowledge of the in-orbit background environment is essential to assess the
scientific performance of the mission and optimize the design of its main
instrument, the Large Area Detector (LAD). In this paper the results of an
extensive Geant-4 simulation of the instrument will be discussed, showing the
main contributions to the background and the design solutions for its reduction
and control. Our results show that the current LOFT/LAD design is expected to
meet its scientific requirement of a background rate equivalent to 10 mCrab in
2-30 keV, achieving about 5 mCrab in the most important 2-10 keV energy band.
Moreover, simulations show an anticipated modulation of the background rate as
small as 10% over the orbital timescale. The intrinsic photonic origin of the
largest background component also allows for an efficient modelling, supported
by an in-flight active monitoring, allowing to predict systematic residuals
significantly better than the requirement of 1%, and actually meeting the 0.25%
science goal.


title:
Equivalence of the train model of earthquake and boundary driven
  Edwards-Wilkinson interface

abstract:
  A discretized version of the Burridge-Knopoff train model with (non-linear
friction force replaced by) random pinning is studied in one and two
dimensions. A scale free distribution of avalanches and the Omori law type
behaviour for after-shocks are obtained. The avalanche dynamics of this model
becomes precisely similar (identical exponent values) to the Edwards-Wilkinson
(EW) model of interface propagation. It also allows the complimentary
observation of depinning velocity growth (with exponent value identical with
that for EW model) in this train model and Omori law behaviour of after-shock
(depinning) avalanches in the EW model.


title:
Exotic Topological Types of Majorana Zero-modes and Their Universal
  Quantum Manipulation

abstract:
  From our general index theorem that characterises faithfully the
boundary-bulk correspondence of topological superconductors and insulators, we
reveal rigorously that four topologically distinct types of Majorana zero-modes
can emerge at the ends of superconducting wires with various symmetry classes.
More intriguingly, we establish three exotic one-dimensional models that have
different types of topological charge of Majorana zero-modes, and disclose
exactly the corresponding topological properties, which are respectively
different from those of the Kitaev model because their topological essences
(i.e., the types of topological charge) are distinct. Moreover, we also address
their application in universal quantum manipulation, which is very promising
for realising universal topological quantum computation.


title: Competing interactions and the Lifshitz-type Nonlinear Sigma Model

abstract:
  We establish the equivalence between the continuum limit of the quantum
spherical model with competing interactions, which is relevant to the
investigation of Lifshitz points, and the O(N) nonlinear sigma model with the
addition of higher order spatial derivative operators, which breaks the Lorentz
symmetry and is known as Lifshitz-type (or anisotropic) nonlinear sigma model.
In the context of the 1/N expansion, we also discuss the renormalization
properties of this nonlinear sigma model and find the nontrivial fixed points
of the beta-functions in various dimensions, which turn out to be connected
with the existence of phase transitions in the quantum spherical model.


title: Rotationally symmetric harmonic diffeomorphisms between surfaces

abstract:
  In this paper, we show that the nonexistence of rotationally symmetric
harmonic diffeomorphism between the unit disk without the origin and a
punctured disc with hyperbolic metric on the target.


title:
Evolution of Covariance Functions for Gaussian Process Regression using
  Genetic Programming

abstract:
  In this contribution we describe an approach to evolve composite covariance
functions for Gaussian processes using genetic programming. A critical aspect
of Gaussian processes and similar kernel-based models such as SVM is, that the
covariance function should be adapted to the modeled data. Frequently, the
squared exponential covariance function is used as a default. However, this can
lead to a misspecified model, which does not fit the data well. In the proposed
approach we use a grammar for the composition of covariance functions and
genetic programming to search over the space of sentences that can be derived
from the grammar. We tested the proposed approach on synthetic data from
two-dimensional test functions, and on the Mauna Loa CO2 time series. The
results show, that our approach is feasible, finding covariance functions that
perform much better than a default covariance function. For the CO2 data set a
composite covariance function is found, that matches the performance of a
hand-tuned covariance function.


title: Lucky Imaging of transiting planet host stars with LuckyCam

abstract:
  We obtained high-resolution, high-contrast optical imaging in the SDSS $i'$
band with the LuckyCam camera mounted on the 2.56m Nordic Optical Telescope, to
search for faint stellar companions to 16 stars harbouring transiting
exoplanets. The Lucky Imaging technique uses very short exposures to obtain
near diffraction-limited images yielding sub-arcsecond sensitivity, allowing us
to search for faint stellar companions within the seeing disc of the primary
planet host. Here we report the detection of two candidate stellar companions
to the planet host TrES-1 at separations $<6.5\arcsec$ and we confirm stellar
companions to CoRoT-2, CoRoT-3, TrES-2, TrES-4, and HAT-P-7 already known in
the literature. We do not confirm the candidate companions to HAT-P-8 found via
Lucky Imaging by \citet{Bergfors2013}, however, most probably because HAT-P-8
was observed in poor seeing conditions. Our detection sensitivity limits allow
us to place constraints on the spectral types and masses of the putative bound
companions to the planet host stars in our sample. If bound, the stellar
companions identified in this work would provide stringent observational
constraints to models of planet formation and evolution. In addition these
companions could affect the derived physical properties of the exoplanets in
these systems.


title:
Strange quark mass from sum rules with improved perturbative QCD
  convergence

abstract:
  The strange quark mass is determined from a QCD Finite Energy Sum Rule (FESR)
optimized to reduce considerably the systematic uncertainties arising from the
hadronic resonance sector, as well as from the poor convergence of the
pseudoscalar correlator in perturbative QCD. The former is achieved by
introducing a suitable integration kernel in the Cauchy integral in the complex
squared energy plane. The latter is obtained by optimizing the perturbative
expansion to accelerate its convergence. The result for the strange quark mass
in the $\bar{MS}$ scheme at a scale of 2 GeV is m_s(2 GeV) = (94 \pm 9)MeV.


title: Formation control with pole placement for multi-agent systems

abstract:
  The problem of distributed controller synthesis for formation control of
multi-agent systems is considered. The agents (single integrators) communicate
over a communication graph and a decentralized linear feedback structure is
assumed. One of the agents is designated as the leader. If the communication
graph contains a directed spanning tree with the leader node as the root, then
it is possible to place the poles of the ensemble system with purely local
feedback controller gains. Given a desired formation, first one of the poles is
placed at the origin. Then it is shown that the inter-agent weights can be
independently adjusted to assign an eigenvector corresponding to the formation
positions, to the zero eigenvalue. Then, only the leader input is enough to
bring the agents to the desired formation and keep it there with no further
inputs. Moreover, given a formation, the computation of the inter-agent weights
that encode the formation information, can be calculated in a decentralized
fashion using only local information.


title:
Rapidly evaluating the compact binary likelihood function via
  interpolation

abstract:
  Bayesian parameter estimation on gravitational waves from compact binary
coalescences (CBCs) typically requires millions of template waveform
computations at different values of the parameters describing the binary.
Sampling techniques such as Markov chain Monte Carlo and nested sampling
evaluate likelihoods, and hence compute template waveforms, serially; thus, the
total computational time of the analysis scales linearly with that of template
generation. Here we address the issue of rapidly computing the likelihood
function of CBC sources with non-spinning components. We show how to
efficiently compute the continuous likelihood function on the three-dimensional
subspace of parameters on which it has a non-trivial dependence (the chirp
mass, symmetric mass ratio and coalescence time) via interpolation.
Subsequently, sampling this interpolated likelihood function is a significantly
cheaper computational process than directly evaluating the likelihood; we
report improvements in computational time of two to three orders of magnitude
while keeping likelihoods accurate to < 0.025 %. Generating the interpolant of
the likelihood function over a significant portion of the CBC mass space is
computationally expensive but highly parallelizable, so the wall time can be
very small relative to the time of a full parameter-estimation analysis.


title: High-spin structures of 136Cs

abstract:
  Odd-odd 136Cs nuclei have been produced in the 18O + 208Pb and 12C + 238U
fusion-fission reactions and their gamma rays studied with the Euroball array.
The high-spin level scheme has been built up to ~ 4.7 MeV excitation energy and
spin I ~ 16 hbar from the triple gamma-ray coincidence data. The configurations
of the three structures observed above ~ 2 MeV excitation energy are first
discussed by analogy with the proton excitations identified in the semi-magic
137Cs nucleus, which involve the three high-j orbits lying above the Z=50 gap,
pi g_{7/2}, pi d_{5/2} and pi h_{11/2}. This is confirmed by the results of
shell-model calculations performed in this work.


title: New applications of renormalization group methods in nuclear physics

abstract:
  We review recent developments in the use of renormalization group (RG)
methods in low-energy nuclear physics. These advances include enhanced RG
technology, particularly for three-nucleon forces, which greatly extends the
reach and accuracy of microscopic calculations. We discuss new results for the
nucleonic equation of state with applications to astrophysical systems such as
neutron stars, new calculations of the structure and reactions of finite
nuclei, and new explorations of correlations in nuclear systems.


title:
Symbolic Complexity for Nucleotide Sequences: A Sign of the Genome
  Structure

abstract:
  We introduce a method to estimate the complexity function of symbolic
dynamical systems from a finite sequence of symbols. We test such complexity
estimator on several symbolic dynamical systems whose complexity functions are
known exactly. We use this technique to estimate the complexity function for
genomes of several organisms under the assumption that a genome is a sequence
produced by a (unknown) dynamical system. We show that the genome of several
organisms share the property that their complexity functions behaves
exponentially for words of small length $\ell$ ($0\leq \ell \leq 10$) and
linearly for word lengths in the range $11 \leq \ell \leq 50$. It is also found
that the species which are phylogenetically close each other have similar
complexity functions calculated from a sample of their corresponding coding
regions.


title:
Evaporative cooling of a small number of atoms in a single-beam
  microscopic dipole trap

abstract:
  We demonstrate experimentally the evaporative cooling of a few hundred
rubidium 87 atoms in a single-beam microscopic dipole trap. Starting from 800
atoms at a temperature of 125microKelvins, we produce an unpolarized sample of
40 atoms at 110nK, within 3s. The phase-space density at the end of the
evaporation reaches unity, close to quantum degeneracy. The gain in phase-space
density after evaporation is 10^3. We find that the scaling laws used for much
larger numbers of atoms are still valid despite the small number of atoms
involved in the evaporative cooling process. We also compare our results to a
simple kinetic model describing the evaporation process and find good agreement
with the data.


title:
A fast randomized Kaczmarz algorithm for sparse solutions of consistent
  linear systems

abstract:
  The Kaczmarz algorithm is a popular solver for overdetermined linear systems
due to its simplicity and speed. In this paper, we propose a modification that
speeds up the convergence of the randomized Kaczmarz algorithm for systems of
linear equations with sparse solutions. The speedup is achieved by projecting
every iterate onto a weighted row of the linear system while maintaining the
random row selection criteria of Strohmer and Vershynin. The weights are chosen
to attenuate the contribution of row elements that lie outside of the estimated
support of the sparse solution. While the Kaczmarz algorithm and its variants
can only find solutions to overdetermined linear systems, our algorithm
surprisingly succeeds in finding sparse solutions to underdetermined linear
systems as well. We present empirical studies which demonstrate the
acceleration in convergence to the sparse solution using this modified approach
in the overdetermined case. We also demonstrate the sparse recovery
capabilities of our approach in the underdetermined case and compare the
performance with that of $\ell_1$ minimization.


title: Some Banach algebra structures for l^p({\beta}) and their operators

abstract:
  In this paper we consider the generalized Duhamel product ~ on l^p({\beta})
and characterize some Banach algebra structures for l^p({\beta}).


title: On contact interactions as limits of short-range potentials

abstract:
  We reconsider the norm resolvent limit of $-\Delta + V_\ell$ with $V_\ell$
tending to a point interaction in three dimensions. We are mainly interested in
potentials $V_\ell$ modelling short range interactions of cold atomic gases. In
order to ensure stability the interaction $V_\ell$ is required to have a strong
repulsive core, such that $\lim_{\ell \to 0} \int V_\ell >0$. This situation is
not covered in the previous literature.


title:
"Liquid-gas" transition in the supercritical region: Fundamental changes
  in the particle dynamics

abstract:
  Recently, we have proposed a new dynamic line on the phase diagram in the
supercritical region. Crossing this line corresponds to the radical changes of
the fluid properties. Here, we focus on the dynamics of model Lennard-Jones and
Soft-Sphere fluids. We show that the change of the dynamics from the
liquid-like to gas-like can be established on the basis of the velocity
autocorrelation function and mean-square displacement. Using the rigorous
criterion, we show that the crossover of particle dynamics and key liquid
properties occurs at the same line. We further show that positive sound
dispersion disappears in the vicinity of this line in both kinds of systems.
The dynamic line bears no relationship to the existence of the critical point.
We find that the region of existence of liquid-like dynamics narrows with the
increase of the exponent of the repulsive part of inter-particle potential.


title:
First proton-pair breaking in semi-magic nuclei beyond 132Sn and 208Pb:
  Configuration of the long-lived isomer of 217Pa

abstract:
  The close similarity between the shell structures in the 132Sn and 208Pb
regions is a well known phenomenon. Thus, using the correspondence between the
high-j orbits located above the Z=50 and Z=82 shell gaps, we discuss the
evolutions of the fully aligned states with one broken proton pair in the N=82
and N=126 isotones. A long-lived isomeric state was discovered in 217Pa more
than thirty years ago and despite two other experiments giving new experimental
results, the discussions on its main properties (spin, parity, configuration)
remained inconclusive. Then, using the comparison with the I^\pi=17/2^+
isomeric state recently measured in 139La, the isomeric state of 217Pa is
assigned as the fully aligned state of the (\pi h_{9/2})^2(\pi f_{7/2})^1
configuration.


title:
Metamaterial transparency induced by cooperative electromagnetic
  interactions

abstract:
  We propose a cooperative asymmetry-induced transparency, CAIT, formed by
collective excitations in metamaterial arrays of discrete resonators. CAIT can
display a sharp transmission resonance even when the constituent resonators
individually exhibit broad resonances. We further show how dynamically
reconfiguring the metamaterial allows one to actively control the transparency.
While reminiscent of electromagnetically induced transparency, which can be
described by independent emitters, CAIT relies on a cooperative response
resulting from strong radiative couplings between the resonators.


title: Project X: A Flexible High Power Proton Facility

abstract:
  Project X is a high intensity proton facility that will support a
world-leading Intensity Frontier research program over the next several decades
at Fermilab. When compared to other facilities in the planning stages elsewhere
in the world Project X is completely unique in its ability to deliver,
simultaneously, up to 6 MW of site-wide beam power to multiple experiments, at
multiple energies, and with flexible beam formats. Project X will support a
wide range of experiments based on neutrinos, muons, kaons, nucleons, and
nuclei. In addition, Project X will lay the foundation for the long-term
development of a Neutrino Factory and/or Muon Collider. A complete concept for
Project X has been developed and is documented in the Project X Reference
Design Report.


title:
Interplay between spin-orbit interactions and a time-dependent
  electromagnetic field in monolayer graphene

abstract:
  We apply a circularly and linearly polarized terahertz field on a monolayer
of graphene taking into account spin-orbit interactions of the intrinsic and
Rashba type. It turns out that the field can not only be used to induce a gap
in the energy spectrum, but also to close an existing gap due to the different
reaction of the spin components on circularly polarized light. Signatures of
spin-orbit coupling on the density of states of the driven system can be
observed even for energies where the static density of states is independent of
spin-orbit interactions. Furthermore it is shown that the time evolution of the
spin polarization and the orbital dynamics of an initial wave packet can be
modulated by varying the ratio of the spin-orbit coupling parameters. Assuming
that the system acquires a quasi stationary state, the optical conductivity of
the irradiated sample is calculated. Our results confirm the multi step nature
of the conductivity obtained recently, where the number of intermediate steps
can be changed by adjusting the spin-orbit coupling parameters and the
orientation of the field.


title:
Effects of Interference between Energy Absorption Processes of Molecule
  and Surface Plasmons on Light Emission Induced by Scanning Tunneling
  Microscopy

abstract:
  Effects of coupling between an molecular exciton and a surface plasmon
(exciton-plasmon coupling) on the luminescence properties of the molecule and
the surface plasmons are investigated using nonequilibrium Green's function
method. Molecular absorption and enhancement by molecular electronic and
vibrational modes (molecular modes) lead to dip and peak structures in the
luminescence spectra of the surface plasmons. The re-absorption by the surface
plasmons leads to a dent structure in their luminescence spectra. It is found
that the processes of the molecular absorption and the re-absorption by the
surface plasmons interfere with each other. Enhancement and suppression of
these energy-absorption processes are due to the interference. Moreover, due to
the exciton-plasmon coupling, excitation channels of the molecule arise in the
energy range lower than the first electronic excitation energy of the molecule.
It is found that the electron transitions via these excitation channels give
rise to the molecular luminescence and the vibrational excitations at the bias
voltage lower than the ratio of the first electronic excitation energy of the
molecule to the elementary charge. The results also indicate that the
vibrational excitations assist the emission of photons, whose energy exceeds
the product of the elementary charge and the bias voltage (upconverted
luminescence).


title: On Collective Properties of Dense QCD Matter

abstract:
  A short review of the two recently analyzed collective effects in dense
non-Abelian matter, the photon and dilepton production in nonequilibrium glasma
and polarization properties of turbulent Abelian and non-Abelian plasmas, is
given.


title:
Phase-space distribution functions for photon propagation in waveguides
  coupled to a qubit

abstract:
  We investigate propagation of few-photon pulses in waveguides coupled to a
two-level system by means of the method of distribution functions in
coordinate-momentum space that provides a detailed description of photon
systems. We find that the distribution function of the transmitted pulse can be
negative for the nonclassical input (i.e., single-photon Fock state). This
reveals the quasiprobability nature of photon distribution. Analytical
expressions for photon densities in the momentum space as well as in the
coordinate space are obtained for the mentioned single-photon Gaussian input.
We also study evolution of the multimode coherent-state input for an arbitrary
photon number. Time-dependent differential equations describing average
densities and fluctuations of outgoing photons are derived and solved.
Influence of the number of input photons, pulse width, and radiation-atom
interaction strength on the statistical properties of the fluctuations is
investigated.


title: Multi-View Learning for Web Spam Detection

abstract:
  Spam pages are designed to maliciously appear among the top search results by
excessive usage of popular terms. Therefore, spam pages should be removed using
an effective and efficient spam detection system. Previous methods for web spam
classification used several features from various information sources (page
contents, web graph, access logs, etc.) to detect web spam. In this paper, we
follow page-level classification approach to build fast and scalable spam
filters. We show that each web page can be classified with satisfiable accuracy
using only its own HTML content. In order to design a multi-view classification
system, we used state-of-the-art spam classification methods with distinct
feature sets (views) as the base classifiers. Then, a fusion model is learned
to combine the output of the base classifiers and make final prediction.
Results show that multi-view learning significantly improves the classification
performance, namely AUC by 22%, while providing linear speedup for parallel
execution.


title:
Analysis of fields in an air-cored superconducting synchronous motor
  with an HTS racetrack field winding

abstract:
  High temperature superconducting (HTS) synchronous motors can offer
significant weight and size reductions, as well as improved efficiency, over
conventional copper-wound machines due to the higher current density of high
temperature superconducting (HTS) materials. In order to optimise the design
parameters and performance of such a machine, this paper proposes a basic
physical model of an air-cored HTS synchronous motor with a copper armature
winding and HTS field winding. An analytical method for the field analysis in
the synchronous motor is then presented, followed by a numerical finite element
analysis (FEA) model to verify the analytical solution. The model is utilised
to study the influence of the geometry of the HTS coils on the magnetic field
at the armature winding, and geometrical parameter optimisation is carried out
using this theoretical model to obtain a more sinusoidal magnetic field at the
armature, which has a major influence on the performance of the motor.


title:
Anomalous Josephson current, incipient time-reversal symmetry breaking,
  and Majorana bound states in interacting multi-level dots

abstract:
  We study the combined effects of spin-orbit interaction, magnetic field, and
Coulomb charging on the Josephson current-phase relation, I(\varphi), for a
multi-level quantum dot tunnel-contacted by two conventional s-wave
superconductors with phase difference \varphi. A general model is formulated
and analyzed in the cotunneling regime (weak tunnel coupling) and in the deep
subgap limit, fully taking into account interaction effects. We determine the
conditions for observing a finite anomalous supercurrent I_a=I(\varphi=0). For
a two-level dot with spin-orbit coupling and arbitrarily weak Zeeman field B,
we find the onset behavior I_a\propto {\rm sgn}(B) in the presence of
interactions, suggesting the incipient spontaneous breakdown of time-reversal
symmetry. We also provide conditions for realizing spatially separated (but
topologically unprotected) Majorana bound states in this system, which have a
clear signature in the 2\pi-periodic current-phase relation.


title: Families of distributions and Pfaff systems under duality

abstract:
  A singular distribution on a non-singular variety $X$ can be defined either
by a subsheaf $D$ of the tangent sheaf, or by the zeros of a subsheaf $D^0$ of
the sheaf of 1-forms. Although both definitions are equivalent under mild
conditions on $D$, they give rise, in general, to non-equivalent notions of
flat families. In this work we investigate conditions under which both notions
of flat families are equivalent. In the last sections we focus on the case
where the distribution is integrable, and we use our results to generalize a
theorem of Cukierman and Pereira.


title: Strong Signatures of Right-Handed Compositeness

abstract:
  Right-handed light quarks could be significantly composite, yet compatible
with experimental searches at the LHC and precision tests on Standard Model
couplings. In these scenarios, that are motivated by flavor physics, one
expects large cross sections for the production of new resonances coupled to
light quarks. We study experimental strong signatures of right-handed
compositeness at the LHC, and constrain the parameter space of these models
with recent results by ATLAS and CMS. We show that the LHC sensitivity could be
significantly improved if dedicated searches were performed, in particular in
multi-jet signals.


title:
Linear partial $q$-difference equations on $q$-linear lattices and their
  bivariate $q$-orthogonal polynomial solutions

abstract:
  Orthogonal polynomial solutions of an admissible potentially self-adjoint
linear second-order partial $q$-difference equation of the hypergeometric type
in two variables on $q$-linear lattices are analyzed. A $q$-Pearson's system
for the orthogonality weight function, as well as for the difference
derivatives of the solutions are presented, giving rise to a solution of the
$q$-difference equation under study in terms of a Rodrigues-type formula. The
monic orthogonal polynomial solutions are treated in detail, giving explicit
formulae for the matrices in the corresponding recurrence relations they
satisfy. Lewanowicz and Wo\'zny [S. Lewanowicz, P. Wo\'zny, J. Comput. Appl.
Math. 233 (2010) 1554--1561] have recently introduced a (non-monic) bivariate
extension of big $q$-Jacobi polynomials together with a partial $q$-difference
equation of the hypergeometric type that governs them. This equation is
analyzed in the last section: we provide two more orthogonal polynomial
solutions, namely, a second non-monic solution from the Rodrigues'
representation, and the monic solution both from the recurrence relation that
govern them and also explicitly given in terms of generalized bivariate basic
hypergeometric series. Limit relations as $q \uparrow 1$ for the partial
$q$-difference equation and for the all three $q$-orthogonal polynomial
solutions are also presented.


title: Lepton number violation in D meson decay

abstract:
  The lepton number violating process can be induced by introducing a fourth
generation heavy Majorana neutrino, which is coupled to the charged leptons of
Standard Model. There have been many previous studies on the leptonic number
violating decay processes with this mechanism, we follow the trend to study the
process: $D \to K \ell \ell \pi$ with the same-sign dilepton final states. We
restrict ourself to certain neutrino mass regions, in which the heavy neutrino
could be on shell and the dominant contribution to the branching fraction comes
from the resonance enhanced effect. Applying the Narrow Width Approximation, we
found that upper limit for the branching fractions for $D^0 \to
K^-\ell^+\ell^+\pi^-$ are generally at the order of $10^{-10}$ to $10^{-9}$, if
we take the most stringent upper limit bound currently available in the
literature for the mixing matrix elements. We also provide the constrains,
which is competitive compared to the LNV B decays, on the mixing matrix element
$|V_{eN}|^2$ based on the upper limit of $D^0 \to K^- e^+ e^+ \pi^-$ estimated
from Monte-Carlo study at BESIII.


title: Categories of Quantum and Classical Channels

abstract:
  We introduce a construction that turns a category of pure state spaces and
operators into a category of observable algebras and superoperators. For
example, it turns the category of finite-dimensional Hilbert spaces into the
category of finite-dimensional C*-algebras and completely positive maps. In
particular, the new category contains both quantum and classical channels,
providing elegant abstract notions of preparation and measurement. We also
consider nonstandard models, that can be used to investigate which notions from
algebraic quantum information theory are operationally justifiable.


title:
Effects of Functionalization on Thermal Properties of Single-Wall and
  Multi-Wall Carbon Nanotube - Polymer Nanocomposites

abstract:
  Carboxylic functionalization (-COOH groups) of carbon nanotubes is known to
improve their dispersion properties and increase the electrical conductivity of
carbon-nanotube - polymer nanocomposites. We have studied experimentally the
effects of this type of functionalization on the thermal conductivity of the
nanocomposites. It was found that while even small quantities of carbon
nanotubes (~1 wt%) can increase the electrical conductivity, a larger loading
fraction (~3 wt%) is required to enhance the thermal conductivity of
nanocomposites. Functionalized multi-wall carbon nanotubes performed the best
as filler material leading to a simultaneous improvement of the electrical and
thermal properties of the composites. Functionalization of the single-wall
carbon nanotubes reduced the thermal conductivity enhancement. The observed
trends were explained by the fact that while surface functionalization
increases the coupling between carbon nanotube and polymer matrix it also leads
to formation of defects, which impede the acoustic phonon transport in the
single wall carbon nanotubes. The obtained results are important for
applications of carbon nanotubes and graphene flakes as fillers for improving
thermal, electrical and mechanical properties of composites.


title:
Azimuthal correlations of heavy quarks in Pb+Pb collisions at LHC
  ($\sqrt{s}=2.76$ TeV)

abstract:
  In this paper we study the azimuthal correlations of heavy quarks in Pb+Pb
collisions with $\sqrt{s}=2.76$ TeV at LHC. Due to the interaction with the
medium heavy quarks and antiquarks are deflected from their original direction
and the initial correlation of the pair is broadened. We investigate this
effect for different transverse momentum classes. Low-momentum heavy-quark
pairs lose their leading order back-to-back initial correlation, while a
significant residual correlation survives at large momenta. Due to the larger
acquired average deflection from their original directions the azimuthal
correlations of heavy-quark pairs are broadened more efficiently in a purely
collisional energy loss mechanism compared to including radiative corrections.
This discriminatory feature survives when next-to-leading order production
processes are included.


title: w-Stability and Clifford w-Regularity of Polynomial Rings

abstract:
  We investigate the transfer of w-stability and Clifford w-regularity from a
domain D to the polynomial ring D[X]. We show that these two properties pass
from D to D[X] when D is either integrally closed or it is Mori and
w-divisorial.


title: Explaining observations of rapidly rotating neutron stars in LMXBs

abstract:
  In a previous paper [M. E. Gusakov, A. I. Chugunov, and E. M. Kantor, Phys.
Rev. Lett. 112, 151101 (2014)], we introduced a new scenario that explains the
existence of rapidly rotating warm neutron stars (NSs) observed in low-mass
X-ray binaries (LMXBs). Here it is described in more detail. The scenario takes
into account the interaction between superfluid inertial modes and the normal
(quadrupole) $m=2$ $r$-mode, which can be driven unstable by
Chandrasekhar-Friedman-Schutz (CFS) mechanism. This interaction can only occur
at some fixed "resonance" stellar temperatures; it leads to formation of the
"stability peaks" which stabilize a star in the vicinity of these temperatures.
We demonstrate that a NS in LMXB spends a substantial fraction of time on the
stability peak, that is, in the region of stellar temperatures and spin
frequencies, that has been previously thought to be CFS unstable with respect
to excitation of $r$-modes. We also find that the spin frequencies of NSs are
limited by the CFS instability of normal (octupole) $m=3$ $r$-mode rather than
by $m=2$ $r$-mode. This result agrees with the predicted value of the cutoff
spin frequency $\sim 730$ Hz in the spin distribution of accreting millisecond
X-ray pulsars. In addition, we analyze evolution of a NS after the end of the
accretion phase and demonstrate that millisecond pulsars can be born in LMXBs
within our scenario. Besides millisecond pulsars, our scenario also predicts a
new class of LMXB descendants - hot and rapidly rotating nonaccreting NSs ("hot
widows"/HOFNARs). Further comparison of the proposed theory with observations
of rotating NSs can impose new important constraints on the properties of
superdense matter.


title:
Unveiling a population of galaxies harboring low-mass black holes with
  X-rays

abstract:
  We report the discovery of three low-mass black hole candidates residing in
the centers of low-mass galaxies at z<0.3 in the Chandra Deep Field - South
Survey. These black holes are initially identified as candidate active galactic
nuclei based on their X-ray emission in deep Chandra observations.
Multi-wavelength observations are used to strengthen our claim that such
emission is powered by an accreting supermassive black hole. While the X-ray
luminosities are low at L_X ~ 10^40 erg s^-1 (and variable in one case), we
argue that they are unlikely to be attributed to star formation based on
H\alpha or UV-fluxes. Optical spectroscopy with Keck/DEIMOS and VLT/FORS allows
us to (1) measure accurate redshifts, (2) confirm their low stellar host mass,
(3) investigate the source(s) of photo-ionization, and (4) estimate extinction.
With stellar masses of M* < 3*10^9 M_\sun determined from HST/ACS imaging, the
host galaxies are among the lowest mass systems known to host actively
accreting black holes. We estimate BH masses M_BH ~ 2*10^5 M_\sun based on
scaling relations between BH mass and host properties for more luminous
systems. In one case, a broad component of the H\alpha emission-line profile is
detected thus providing a virial mass estimate. Black holes in such low-mass
galaxies are of considerable interest as the low-redshift analogs to the seeds
of the most massive BHs at high redshift which have remained largely elusive to
date. Our study highlights the power of deep X-ray surveys to uncover such
low-mass systems.


title: 3SUM, 3XOR, Triangles

abstract:
  We show that if one can solve 3SUM on a set of size n in time n^{1+\e} then
one can list t triangles in a graph with m edges in time
O(m^{1+\e}t^{1/3-\e/3}). This is a reversal of Patrascu's reduction from 3SUM
to listing triangles (STOC '10). Our result builds on and extends works by the
Paghs (PODS '06) and by Vassilevska and Williams (FOCS '10). We make our
reductions deterministic using tools from pseudorandomness.
  We then re-execute both Patrascu's reduction and our reversal for the variant
3XOR of 3SUM where integer summation is replaced by bit-wise xor. As a
corollary we obtain that if 3XOR is solvable in linear time but 3SUM requires
quadratic randomized time, or vice versa, then the randomized time complexity
of listing m triangles in a graph with $m$ edges is m^{4/3} up to a factor
m^\alpha for any \alpha > 0.


title:
Exploiting non-constant safe memory in resilient algorithms and data
  structures

abstract:
  We extend the Faulty RAM model by Finocchi and Italiano (2008) by adding a
safe memory of arbitrary size $S$, and we then derive tradeoffs between the
performance of resilient algorithmic techniques and the size of the safe
memory. Let $\delta$ and $\alpha$ denote, respectively, the maximum amount of
faults which can happen during the execution of an algorithm and the actual
number of occurred faults, with $\alpha \leq \delta$. We propose a resilient
algorithm for sorting $n$ entries which requires $O\left(n\log n+\alpha
(\delta/S + \log S)\right)$ time and uses $\Theta(S)$ safe memory words. Our
algorithm outperforms previous resilient sorting algorithms which do not
exploit the available safe memory and require $O\left(n\log n+
\alpha\delta\right)$ time. Finally, we exploit our sorting algorithm for
deriving a resilient priority queue. Our implementation uses $\Theta(S)$ safe
memory words and $\Theta(n)$ faulty memory words for storing $n$ keys, and
requires $O\left(\log n + \delta/S\right)$ amortized time for each insert and
deletemin operation. Our resilient priority queue improves the $O\left(\log n +
\delta\right)$ amortized time required by the state of the art.


title: Locally principal ideals and finite character

abstract:
  It is well-known that if R is a domain with finite character, each locally
principal nonzero ideal of R is invertible. We address the problem of
understanding when the converse is true and survey some recent results.


title:
Flexible RNA design under structure and sequence constraints using
  formal languages

abstract:
  The problem of RNA secondary structure design (also called inverse folding)
is the following: given a target secondary structure, one aims to create a
sequence that folds into, or is compatible with, a given structure. In several
practical applications in biology, additional constraints must be taken into
account, such as the presence/absence of regulatory motifs, either at a
specific location or anywhere in the sequence. In this study, we investigate
the design of RNA sequences from their targeted secondary structure, given
these additional sequence constraints. To this purpose, we develop a general
framework based on concepts of language theory, namely context-free grammars
and finite automata. We efficiently combine a comprehensive set of constraints
into a unifying context-free grammar of moderate size. From there, we use
generic generic algorithms to perform a (weighted) random generation, or an
exhaustive enumeration, of candidate sequences. The resulting method, whose
complexity scales linearly with the length of the RNA, was implemented as a
standalone program. The resulting software was embedded into a publicly
available dedicated web server. The applicability demonstrated of the method on
a concrete case study dedicated to Exon Splicing Enhancers, in which our
approach was successfully used in the design of \emph{in vitro} experiments.


title: Exploring the tree of numerical semigroups

abstract:
  In this paper we describe an algorithm visiting all numerical semigroups up
to a given genus using a well suited representation. The interest of this
algorithm is that it fits particularly well the architecture of modern
computers allowing very large optimizations: we obtain the number of numerical
semigroups of genus g 67 and we confirm the Wilf conjecture for g 60.