title:
Innermost structure and near-infrared radiation of dusty clumpy tori in
  active galactic nuclei

abstract:
  The dusty clumpy torus surrounds the central black hole (BH) and the
accretion disk in active galactic nuclei, and governs the growth of
super-massive BHs via gas fueling towards the central engine. Near-infrared
(NIR) monitoring observations have revealed that the torus inner radius is
determined by the dust sublimation process. However, the observed radii are
systematically smaller than the theoretical predictions by a factor of three.
  We take into account the anisotropic illumination by the central accretion
disk to the torus, and calculate the innermost structure of the torus and the
NIR time variablity. We then show that the anisotropy naturally solves the
systematic descrepancy and that the viewing angle is the primary source to
produce an object-to-object scatter of the NIR time delay. Dynamics of clumps
at the innermost region of the torus will be unveiled via future
high-resolution X-ray spectroscopy (e.g., Astro-H).


title:
Finite-amplitude inhomogeneous plane waves in a deformed Mooney-Rivlin
  material

abstract:
  The propagation of finite-amplitude linearly-polarized inhomogeneous
transverse plane waves is considered for a Mooney-Rivlin material maintained in
a state of finite static homogeneous deformation. It is shown that such waves
are possible provided that the directions of the normal to the planes of
constant phase and of the normal to the planes of constant amplitude are
orthogonal and conjugate with respect to the B-ellipsoid, where B is the left
Cauchy-Green strain tensor corresponding to the initial deformation. For these
waves, it is found that even though the system is non-linear, results on energy
flux are nevertheless identical with corresponding results in the classical
linearized elasticity theory. Byproducts of the results are new exact static
solutions for the Mooney-Rivlin material.


title:
Finite-amplitude inhomogeneous plane waves of exponential type in
  incompressible elastic materials

abstract:
  It is proved that elliptically-polarized finite-amplitude inhomogeneous plane
waves may not propagate in an isotropic elastic material subject to the
constraint of incompressibility. The waves considered are harmonic in time and
exponentially attenuated in a direction distinct from the direction of
propagation. The result holds whether the material is stress-free or
homogeneously deformed.


title:
Note on the production of scale-invariant entropy perturbation in the
  Ekpyrotic universe

abstract:
  In the standard entropic mechanism adopted in the simple Ekpyrotic models to
generate the nearly scale-invariant and Gaussian primordial perturbation, the
entropy direction is tachyonically unstable. In this paper, we consider the
stable production of the scale-invariant entropy perturbation in the Ekpyrotic
universe via non-minimal couplings. In this model the non-minimally coupled
massless scalar field serves as a spectator and is stabilized by the introduced
non-minimal couplings. It always corresponds to the entropy field during the
contraction and with appropriate couplings can obtain a scale-invariant
spectrum. This scenario requires additional mechanisms such as curvaton or
modulated preheating to convert the entropy perturbation to the curvature
perturbation after the bounce.


title:
Some results on finite amplitude elastic waves propagating in rotating
  media

abstract:
  Two questions related to elastic motions are raised and addressed. First: in
which theoretical framework can the equations of motion be written for an
elastic half-space put into uniform rotation? It is seen that nonlinear finite
elasticity provides such a framework for incompressible solids. Second: how can
finite amplitude exact solutions be generated? It is seen that for some finite
amplitude transverse waves in rotating incompressible elastic solids with
general shear response, the solutions are obtained by reduction of the
equations of motion to a system of ordinary differential equations equivalent
to the system governing the central motion problem of classical mechanics. In
the special case of circularly-polarized harmonic progressive waves, the
dispersion equation is solved in closed form for a variety of shear responses,
including nonlinear models for rubberlike and soft biological tissues. A
fruitful analogy with the motion of a nonlinear string is pointed out.


title:
A Trust-based Recruitment Framework for Multi-hop Social Participatory
  Sensing

abstract:
  The idea of social participatory sensing provides a substrate to benefit from
friendship relations in recruiting a critical mass of participants willing to
attend in a sensing campaign. However, the selection of suitable participants
who are trustable and provide high quality contributions is challenging. In
this paper, we propose a recruitment framework for social participatory
sensing. Our framework leverages multi-hop friendship relations to identify and
select suitable and trustworthy participants among friends or friends of
friends, and finds the most trustable paths to them. The framework also
includes a suggestion component which provides a cluster of suggested friends
along with the path to them, which can be further used for recruitment or
friendship establishment. Simulation results demonstrate the efficacy of our
proposed recruitment framework in terms of selecting a large number of
well-suited participants and providing contributions with high overall trust,
in comparison with one-hop recruitment architecture.


title: Genetic algorithms and solid state NMR pulse sequences

abstract:
  The use of genetic algorithms for the optimisation of magic angle spinning
NMR pulse sequences is discussed. The discussion uses as an example the
optimisation of the C7 dipolar recoupling pulse sequence, aiming to achieve
improved efficiency for spin systems characterised by large chemical shielding
anisotropies and/or small dipolar coupling interactions. The optimised pulse
sequence is found to be robust over a wide range of parameters, requires only
minimal a priori knowledge of the spin system for experimental implementations
with buildup rates being solely determined by the magnitude of the dipolar
coupling interaction, but is found to be less broadbanded than the original C7
pulse sequence. The optimised pulse sequence breaks the synchronicity between
r.f. pulses and sample spinning.


title:
ChaMAILeon: Exploring the Usability of a Privacy Preserving Email
  Sharing System

abstract:
  While passwords, by definition, are meant to be secret, recent trends have
witnessed an increasing number of people sharing their email passwords with
friends, colleagues, and significant others. However, leading websites like
Google advise their users not to share their passwords with anyone, to avoid
security and privacy breaches. To understand users' general password sharing
behavior and practices, we conducted an online survey with 209 Indian
participants and found that 64.35% of the participants felt a need to share
their email passwords. Further, about 77% of the participants said that they
would want to use a system which could provide them access control features, to
maintain their privacy while sharing emails. To address the privacy concerns of
users who need to share emails, we propose ChaMAILeon, a system which enables
users to share their email passwords while maintaining their privacy.
ChaMAILeon allows users to create multiple passwords for their email account.
Each such password corresponds to a different set of access control rules, and
gives a different view of the same email account. We conducted a controlled
experiment with 30 participants to evaluate the usability of the system. Each
participant was required to perform 5 tasks. Each task corresponded to
different access control rules, which the participant was required to set, for
a dummy email account. We found that, with a reasonable number of multiple
attempts, all 30 participants were able to perform all 5 tasks given to them.
The system usability score was found out to be 75.42. Moreover, 56.6% of the
participants said that they would like to use ChaMAILeon frequently.


title:
Cumulative Effect in Information Diffusion: A Comprehensive Empirical
  Study on Microblogging Network

abstract:
  Cumulative effect in social contagions underlies many studies on the spread
of innovation, behaviors, and influence. However, few large-scale empirical
studies are conducted to validate the existence of cumulative effect in the
information diffusion on social networks. In this paper, using the
population-scale dataset from the largest Chinese microblogging website, we
conduct a comprehensive study on the cumulative effect in information
diffusion. We base our study on the diffusion network of each message, where
nodes are the involved users and links are the following relationships among
them. We find that multiple exposures to the same message indeed increase the
possibility of forwarding it. However, additional exposures cannot further
improve the chance of forwarding when the number of exposures crosses its peak
at two. This finding questions the cumulative effect hypothesis in information
diffusion. Furthermore, to clarify the forwarding preference among users, we
investigate both the structural motif of the diffusion network and the temporal
pattern of information diffusion process among users. The patterns provide
vital insight for understanding the variation of message popularity and explain
the characteristics of diffusion networks.


title:
New SU(1, 1) Position-Dependent Effective Mass Coherent States for the
  Generalized Shifted Harmonic Oscillator

abstract:
  A new SU(1, 1) position-dependent effective mass coherent states (PDEM CS)
related to the shifted harmonic oscillator (SHO) are deduced. This is
accomplished by applying a similarity transformation to the generally deformed
oscillator algebra (GDOA) generators for PDEM system and construct a new set of
operators which close the su(1, 1) Lie algebra, being the PDEM CS of the basis
for its unitary irreducible representation. The residual potential is
associated to the SHO. From the Lie algebra generators, we evaluate the
uncertainty relationship for a position and momentum-like operators in the PDEM
CS and show that it is minimized in the sense of Barut-Girardello CS. We prove
that the deduced PDEM CS preserve the same analytical form than those of
Glauber states. We show that the probability density of dynamical evolution in
the PDEM CS oscillates back and forth as time goes by and behaves as classical
wave packet.


title: Shear instability in skin tissue

abstract:
  We propose two toy-models to describe, predict, and interpret the wrinkles
appearing on the surface of skin when it is sheared. With the first model, we
account for the lines of greatest tension present in human skin by subjecting a
layer of soft tissue to a pre-stretch, and for the epidermis by endowing one of
the layer's faces with a surface tension. For the second model, we consider an
anisotropic model for the skin, to reflect the presence of stiff collagen
fibres in a softer elastic matrix. In both cases, we find an explicit
bifurcation criterion, linking geometrical and material parameters to a
critical shear deformation accompanied by small static wrinkles, with decaying
amplitudes normal to the free surface of skin.


title:
Replication of proto-RNAs sustained by ligase-helicase cycle in oligomer
  world

abstract:
  A mechanism of the replication of proto-RNAs in oligomer world is proposed.
The replication is carried out by a minimum cycle which is sustained by a
ligase and a helicase. We expect that such a cycle actually worked in the
primordial soup and can be constructed in vitro. By computer simulation the
products of the replication acquires diversity and complexity. Such diversity
and complexity are the bases of the evolution.


title:
Influence of Preservation Temperature on the Measured Mechanical
  Properties of Brain Tissue

abstract:
  The large variability in experimentally measured mechanical properties of
brain tissue is due to many factors including heterogeneity, anisotropy, age
dependence and post-mortem time. Moreover, differences in test protocols also
influence these measured properties. This paper shows that the temperature at
which porcine brain tissue is stored or preserved prior to testing has a
significant effect on the mechanical properties of brain tissue, even when
tests are conducted at the same temperatures. Three groups of brain tissue were
stored separately for at least one hour at three different preservation
temperatures, i.e., ice cold, room temperature (22C) and body temperature
(37C), prior to them all being tested at room temperature (approx. 22C).
Significant differences in the corresponding initial elastic shear modulus mu
(Pa) (at various amounts of shear, K, i.e., 0-0.2) were observed. The initial
elastic moduli were 1043 +/- 271 Pa, 714 +/- 210 Pa and 497 +/- 156 Pa (mean
+/- SD) at preservation temperatures of ice cold, 22C and 37C, respectively.
Based on this investigation, it is strongly recommended that brain tissue
samples must be preserved at an ice-cold temperature prior to testing in order
to minimize the difference between the measured in vitro test results and the
in vivo properties. A by-product of the study is that simple shear tests allow
for large, almost perfectly homogeneous deformation of brain matter.


title:
Water Propagation in the Porous Media, Self-Organized Criticality and
  Ising Model

abstract:
  In this paper we propose the Ising model to study the propagation of water in
2 dimensional (2D) petroleum reservoir in which each bond between its pores has
the probability $p$ of being activated. We analyze the water movement pattern
in porous media described by Darcy equations by focusing on its geometrical
objects. Using Schramm-Loewner evolution (SLE) technique we numerically show
that at $p=p_c\simeq 0.59$, this model lies within the Ising universality class
with the diffusivity parameter $\kappa=3$ and the fractal dimension
$D_f=\frac{11}{8}$. We introduce a self-organized critical model in which the
water movement is modeled by a chain of topplings taking place when the amount
of water exceeds the critical value and numerically show that it coincides with
the numerical reservoir simulation. For this model, the behaviors of
distribution functions of the geometrical quantities and the Green function are
investigated in terms of $p$. We show that percolation probability has a
maximum around $p=0.68$, in contrast to common belief.


title: Declarative Modeling and Bayesian Inference of Dark Matter Halos

abstract:
  Probabilistic programming allows specification of probabilistic models in a
declarative manner. Recently, several new software systems and languages for
probabilistic programming have been developed on the basis of newly developed
and improved methods for approximate inference in probabilistic models. In this
contribution a probabilistic model for an idealized dark matter localization
problem is described. We first derive the probabilistic model for the inference
of dark matter locations and masses, and then show how this model can be
implemented using BUGS and Infer.NET, two software systems for probabilistic
programming. Finally, the different capabilities of both systems are discussed.
The presented dark matter model includes mainly non-conjugate factors, thus, it
is difficult to implement this model with Infer.NET.


title: A numerical scheme to solve fractional optimal control problems

abstract:
  We review recent results obtained to solve fractional order optimal control
problems with free terminal time and a dynamic constraint involving integer and
fractional order derivatives. Some particular cases are studied in detail. A
numerical scheme is given, based on expansion formulas for the fractional
derivative. The efficiency of the method is illustrated through examples.


title: On critical cardinalities related to $Q$-sets

abstract:
  In this note we collect some known information and prove new results about
the small uncountable cardinal $\mathfrak q_0$. The cardinal $\mathfrak q_0$ is
defined as the smallest cardinality $|A|$ of a subset $A\subset \mathbb R$
which is not a $Q$-set (a subspace $A\subset\mathbb R$ is called a $Q$-set if
each subset $B\subset A$ is of type $F_\sigma$ in $A$). We present a simple
proof of a folklore fact that $\mathfrak p\le\mathfrak q_0\le\min\{\mathfrak
b,\mathrm{non}(\mathcal N),\log(\mathfrak c^+)\}$, and also establish the
consistency of a number of strict inequalities between the cardinal $\mathfrak
q_0$ and other standard small uncountable cardinals. This is done by combining
some known forcing results. A new result of the paper is the consistency of
$\mathfrak{p} < \mathfrak{lr} < \mathfrak{q}_0$, where $\mathfrak{lr}$ denotes
the linear refinement number. Another new result is the upper bound $\mathfrak
q_0\le\mathrm{non}(\mathcal I)$ holding for any $\mathfrak q_0$-flexible cccc
$\sigma$-ideal $\mathcal I$ on $\mathbb R$.


title: 126 GeV Higgs boson in the top-seesaw model

abstract:
  We consider a model of dynamical electroweak symmetry breaking built on the
idea of top-seesaw mechanism. The model features a fourth generation of
vector-like QCD quarks responsible for the origin of the top-seesaw mechanism
and leading to the natural explanation of the large splitting between the top
and bottom quark masses. Motivated by the LHC data on the couplings of the
Higgs boson, we include the entire third generation of Standard Model matter
fields into the model. We determine the low energy effective theory and the
resulting low energy spectrum of states, and constrain the model parameters
with constraints from the precision electroweak data and from the requirement
of a light scalar state with quantum numbers of the Standard Model Higgs boson.
Finally, we perform a global fit of the model parameters to the LHC Higgs data
and show that the model is equally viable as the Standard Model itself, and
predicts new states accessible at the LHC.


title:
On the Riemannian Penrose inequality with charge and the cosmic
  censorship conjecture

abstract:
  We note an area-charge inequality orignially due to Gibbons: if the outermost
horizon $S$ in an asymptotically flat electrovacuum initial data set is
connected then $|q|\leq r$, where $q$ is the total charge and $r=\sqrt{A/4\pi}$
is the area radius of $S$. A consequence of this inequality is that for
connected black holes the following lower bound on the area holds: $r\geq
m-\sqrt{m^2-q^2}$. In conjunction with the upper bound $r\leq m +
\sqrt{m^2-q^2}$ which is expected to hold always, this implies the natural
generalization of the Riemannian Penrose inequality: $m\geq 1/2(r+q^2/r)$.


title: In pursuit of the dynamic optimality conjecture

abstract:
  In 1985, Sleator and Tarjan introduced the splay tree, a self-adjusting
binary search tree algorithm. Splay trees were conjectured to perform within a
constant factor as any offline rotation-based search tree algorithm on every
sufficiently long sequence---any binary search tree algorithm that has this
property is said to be dynamically optimal. However, currently neither splay
trees nor any other tree algorithm is known to be dynamically optimal. Here we
survey the progress that has been made in the almost thirty years since the
conjecture was first formulated, and present a binary search tree algorithm
that is dynamically optimal if any binary search tree algorithm is dynamically
optimal.


title: Diameter of the stochastic mean-field model of distance

abstract:
  We consider the complete graph $\cK_n$ on $n$ vertices with exponential mean
$n$ edge lengths. Writing $C_{ij}$ for the weight of the smallest-weight path
between vertex $i,j\in [n]$, Janson showed that $\max_{i,j\in [n]}
C_{ij}/\log{n}$ converges in probability to 3. We extend this result by showing
that $\max_{i,j\in [n]} C_{ij} - 3\log{n}$ converges in distribution to a
limiting random variable that can be identified via a maximization procedure on
a limiting infinite random structure. Interestingly, this limiting random
variable has also appeared as the weak limit of the re-centered graph diameter
of the barely supercritical Erd\H{o}s-R\'enyi random graph in work by Riordan
and Wormald.


title:
Determining Singularities Using Row Sequences of Pad\'e-orthogonal
  Approximants

abstract:
  Starting from the orthogonal polynomial expansion of a function $F$
corresponding to a finite positive Borel measure with infinite compact support,
we study the asymptotic behavior of certain associated rational functions
(Pad\'{e}-orthogonal approximants). We obtain both direct and inverse results
relating the convergence of the poles of the approximants and the singularities
of $F.$ Thereby, we obtain analogues of the theorems of E. Fabry, R. de
Montessus de Ballore, V.I. Buslaev, and S.P. Suetin.


title:
Linear growth of entanglement entropy in holographic thermalization
  captured by horizon interiors and mutual information

abstract:
  We study the holographic entanglement entropy in a homogeneous falling shell
background, which is dual to the strongly coupled field theory following a
global quench. For d=2 conformal field theories, it is known that the entropy
has a linear growth regime if the scale of the entangling region is large. In
addition, the growth rate approaches a constant when the scale increases. We
demonstrate analytically that this behavior is directly related to the part of
minimal area surface probing the interior of apparent horizons in the bulk, as
well as the mutual information between two disjoint rectangular subsystems in
the boundary. Furthermore, we show numerically that all the results are
universal for the d=3 conformal field theory, the non-relativistic
scale-invariant theory and the dual theory of Gauss-Bonnet gravity.


title: The fraction of muon tracks in cosmic neutrinos

abstract:
  The study of the distintive signatures of the ultra high energy events
recently seen by IceCube can allow to single the neutrino origin out. The
detection of tau neutrinos would be a clear way to prove that they come from
cosmic distances, but at the highest energies currently seen, about 1 PeV, an
experimental characterization of tau events is difficult. The study of the
fraction of the muon tracks seems more promising. In fact, for any initial
composition, because of the occurrence of flavor oscillations and despite their
uncertainties, the fraction of muon tracks in the cosmic neutrinos is smaller
than the one of atmospheric neutrinos, even hypothesizing an arbitrarily large
contribution from charmed mesons. A good understanding of the detection
efficiencies and the optimization of the analysis cuts, along with a reasonable
increase in the statistics, should provide us with a significant test of the
cosmic origin of these events.


title:
On existence and properties of strong solutions of one-dimensional
  stochastic equations with an additive noise

abstract:
  One-dimensional stochastic differential equations with additive L\'evy noise
are considered. Conditions for existence and uniqueness of a strong solution
are obtained. In particular, if the noise is a L\'evy symmetric stable process
with $\alpha\in(1;2)$, then the measurability and boundedness of a drift term
is sufficient for the existence of a strong solution. We also study continuous
dependence of the strong solution on the initial value and the drift.


title:
Derivation of the coefficient squared probability law in quantum
  mechanics

abstract:
  If one assumes there is probability of perception in quantum mechanics, then
unitarity dictates that it must have the coefficient squared form, in agreement
with experiment.


title:
Equation of State and Viscosities from a Gravity Dual of the Gluon
  Plasma

abstract:
  Employing new precision data of the equation of state of the SU(3) Yang-Mills
theory (gluon plasma) the dilaton potential of a gravity-dual model is adjusted
in the temperature range $(1 - 10) T_c$ within a bottom-up approach. The ratio
of bulk viscosity to shear viscosity follows then as $\zeta/\eta \approx \pi
\Delta v_s^2$ for $\Delta v_s^2 < 0.2$ and achieves a maximum value of $0.94$
at $\Delta v_s^2 \approx 0.3$, where $\Delta v_s^2 \equiv 1/3 - v_s^2$ is the
non-conformality measure and $v_s^2$ is the velocity of sound squared, while
the ratio of shear viscosity to entropy density is known as $(4 \pi)^{-1}$ for
the considered set-up with Hilbert action on the gravity side.


title:
Cross-border Portfolio Investment Networks and Indicators for Financial
  Crises

abstract:
  Cross-border equity and long-term debt securities portfolio investment
networks are analysed from 2002 to 2012, covering the 2008 global financial
crisis. They serve as network-proxies for measuring the robustness of the
global financial system and the interdependence of financial markets,
respectively. Two early-warning indicators for financial crises are identified:
First, the algebraic connectivity of the equity securities network, as a
measure for structural robustness, drops close to zero already in 2005, while
there is an over-representation of high-degree off-shore financial centres
among the countries most-related to this observation, suggesting an
investigation of such nodes with respect to the structural stability of the
global financial system. Second, using a phenomenological model, the edge
density of the debt securities network is found to describe, and even forecast,
the proliferation of several over-the-counter-traded financial derivatives,
most prominently credit default swaps, enabling one to detect potentially
dangerous levels of market interdependence and systemic risk.


title: Circular unitary ensemble with highly oscillatory potential

abstract:
  We study the effect of highly oscillatory potentials to the eigenvalues of a
random matrix. Consider the circular unitary ensembles with an external
potential which is periodic with the period comparable to the average spacing
of the eigenvalues. We show that in this case the density of states is periodic
and does not converge in the large matrix limit, but the local correlation
functions converge to some simple combinations of the sine kernel and the
potential. We evaluate the correlation functions exactly and also
asymptotically.


title: Eigendecomposition of Block Tridiagonal Matrices

abstract:
  Block tridiagonal matrices arise in applied mathematics, physics, and signal
processing. Many applications require knowledge of eigenvalues and eigenvectors
of block tridiagonal matrices, which can be prohibitively expensive for large
matrix sizes. In this paper, we address the problem of the eigendecomposition
of block tridiagonal matrices by studying a connection between their
eigenvalues and zeros of appropriate matrix polynomials. We use this connection
with matrix polynomials to derive a closed-form expression for the eigenvectors
of block tridiagonal matrices, which eliminates the need for their direct
calculation and can lead to a faster calculation of eigenvalues. We also
demonstrate with an example that our work can lead to fast algorithms for the
eigenvector expansion for block tridiagonal matrices.


title:
The Martingale Property in the Context of Stochastic Differential
  Equations

abstract:
  This note studies the martingale property of a nonnegative, continuous local
martingale Z, given as a nonanticipative functional of a solution to a
stochastic differential equation. The condition states that Z is a (uniformly
integrable) martingale if and only if an integral test of a related functional
holds.


title: Constant mean curvature $k$-noids in homogeneous manifolds

abstract:
  For each $k\geq2$, we construct two families of surfaces with constant mean
curvature $H$ for $H\in[0,1/2]$ in $\Sigma(\kappa)\times\R$ where
$\kappa+4H^2\leq0$. The surfaces are invariant under $2\pi/k$-rotations about a
vertical fiber of $\Sigma(\kappa)\times\R$, have genus zero, and a finite
number of ends. The first family generalizes the notion of $k$-noids: It has
$k$ ends, one horizontal and $k$ vertical symmetry planes. The second family is
less symmetric and has two types of ends. Each surface arises as the conjugate
(sister) surface of a minimal graph in a homogeneous 3-manifold. The domain of
the graph is non-convex in the second family. For $\kappa=-1$ the surfaces with
constant mean curvature $H$ arise from a minimal surface in
$\widetilde{\PSL}_2(\R)$ for $H\in(0,1/2)$ and in $\Nil$ for H=1/2. For H=0,
the conjugate surfaces are both minimal in a product space.


title: Stringy Membranes in AdS/CFT

abstract:
  We study membrane configurations in AdS_{7/4}xS^{4/7}. The membranes are
wrapped around the compact manifold S^{4/7} and are dynamically equivalent to
bosonic strings in AdS_5. We thus conveniently identify them as "Stringy
Membranes". For the case of AdS_7xS^4, their construction is carried out by
embedding the Polyakov action for classical bosonic strings in AdS_5, into the
corresponding membrane action. Therefore, every string configuration in AdS_5
can be realized by an appropriately chosen stringy membrane in AdS_7xS^4. We
discuss the possibility of this being also the case for stringy membranes in
AdS_4xS^7/Z^k (k > 1 or k = 1). By performing a stability analysis to the
constructed solutions, we find that the (membrane) fluctuations along their
transverse directions are organized in multiple Lam\'{e} stability bands and
gaps in the space of parameters of the configurations. In this membrane
picture, strings exhibit a single band/gap structure.


title: Survey on QoE\QoS Correlation Models For Multimedia Services

abstract:
  This paper presents a brief review of some existing correlation models which
attempt to map Quality of Service (QoS) to Quality of Experience (QoE) for
multimedia services. The term QoS refers to deterministic network behaviour, so
that data can be transported with a minimum of packet loss, delay and maximum
bandwidth. QoE is a subjective measure that involves human dimensions; it ties
together user perception, expectations, and experience of the application and
network performance. The Holy Grail of subjective measurement is to predict it
from the objective measurements; in other words predict QoE from a given set of
QoS parameters or vice versa. Whilst there are many quality models for
multimedia, most of them are only partial solutions to predicting QoE from a
given QoS. This contribution analyses a number of previous attempts and
optimisation techniquesthat can reliably compute the weighting coefficients for
the QoS/QoE mapping.


title:
Hybrid Optical and Electrical Network Flows Scheduling in Cloud Data
  Centres

abstract:
  Hybrid intra-data centre networks, with optical and electrical capabilities,
are attracting research interest in recent years. This is attributed to the
emergence of new bandwidth greedy applications and novel computing paradigms. A
key decision to make in networks of this type is the selection and placement of
suitable flows for switching in circuit network. Here, we propose an efficient
strategy for flow selection and placement suitable for hybrid Intra-cloud data
centre networks. We further present techniques for investigating bottlenecks in
a packet networks and for the selection of flows to switch in circuit network.
The bottleneck technique is verified on a Software Defined Network (SDN)
testbed. We also implemented the techniques presented here in a scalable
simulation experiment to investigate the impact of flow selection on network
performance. Results obtained from scalable simulation experiment indicate a
considerable improvement on average throughput, lower configuration delay, and
stability of offloaded flows


title:
Competing 4f-electron dynamics in Ce(Ru1-xFex)2Al10 (x=0 to 1): magnetic
  ordering emerging from the Kondo semiconducting state

abstract:
  We have carried out muon spin relaxation (muSR), neutron diffraction and
inelastic neutron scattering (INS) investigations on polycrystalline samples of
Ce(Ru1-xFex)2Al10 (x=0, 0.3, 0.5, 0.8 and 1) to investigate the nature of the
ground state (magnetic ordered versus paramagnetic) and the origin of the spin
gap formation as evident from the bulk measurements in the end members. Our
zero-field muSR spectra clearly reveal coherent two-frequency oscillations at
low temperature in x=0, 0.3 and 0.5 samples, which confirms the long-range
magnetic ordering of the Ce-moment with TN=27, 26 and 21 K respectively. On the
other hand the muSR spectra of x=0.8 and x=1 down to 1.4 K and 0.045 K,
respectively exhibit a temperature independent Kubo-Toyabe term confirming a
paramagnetic ground state. The long-range magnetic ordering in x=0.5 below 21 K
has been confirmed through the neutron diffraction study. INS measurements of
x=0 clearly reveal the presence of a sharp inelastic excitation near 8 meV
between 5 K and 26 K, due to an opening of a gap in the spin excitation
spectrum, which transforms into a broad response at and above 30 K.
Interestingly, at 4.5 K the spin gap excitation broadens in x=0.3 and exhibits
two clear peaks at 8.4(3) and 12.0(5) meV in x=0.5. In the x=0.8 sample, which
remains paramagnetic down to 1.2 K, there is a clear signature of a spin gap of
10-12 meV at 7 K, with a strong Q-dependent intensity. Evidence of a spin gap
of 12.5(5) meV has also been found in x=1. The observation of a spin gap in the
paramagnetic samples (x=0.8 and 1) is an interesting finding in this study and
it challenges our understanding of the origin of the semiconducting gap in
CeT2Al10 (T=Ru and Os) compounds in terms of hybridization gap opening only a
small part of the Fermi surface, gapped spin waves, or a spin-dimer gap.


title: q-symmetric functions and q-quasisymmetric functions

abstract:
  In this paper, we construct the q-analogue of Poirier-Reutenauer algebras,
related deeply with other q-combinatorial Hopf algebras. As an application, we
use them to realize the odd Schur functions defined in \cite{EK}, and naturally
obtain the odd Littlewood-Richardson rule concerned in \cite{Ell}. Moreover, we
construct the refinement of the odd Schur functions, called odd quasisymmetric
Schur functions, parallel to the consideration in \cite{HLMW1}. All the q-Hopf
algebras we discuss here provide the corresponding q-dual graded graphs in the
sense of \cite{BLL}.


title:
Convergence Analysis and Parallel Computing Implementation for the
  Multiagent Coordination Optimization Algorithm

abstract:
  In this report, a novel variation of Particle Swarm Optimization (PSO)
algorithm, called Multiagent Coordination Optimization (MCO), is implemented in
a parallel computing way for practical use by introducing MATLAB built-in
function "parfor" into MCO. Then we rigorously analyze the global convergence
of MCO by means of semistability theory. Besides sharing global optimal
solutions with the PSO algorithm, the MCO algorithm integrates cooperative
swarm behavior of multiple agents into the update formula by sharing velocity
and position information between neighbors to improve its performance.
Numerical evaluation of the parallel MCO algorithm is provided in the report by
running the proposed algorithm on supercomputers in the High Performance
Computing Center at Texas Tech University. In particular, the optimal value and
consuming time are compared with PSO and serial MCO by solving several
benchmark functions in the literature, respectively. Based on the simulation
results, the performance of the parallel MCO is not only superb compared with
PSO for solving many nonlinear, noncovex optimization problems, but also is of
high efficiency by saving the computational time.


title:
The 617 MHz - $\lambda$ 850 $\mu$m Correlation (Cosmic Rays and Cold
  Dust) in NGC 3044 and NGC 4157

abstract:
  We present the first maps of NGC 3044 and NGC 4157 at $\lambda\,450 \mu$m and
$\lambda\,850 \mu$m from the JCMT as well as the first maps at 617 MHz from the
GMRT. High latitude emission has been detected in both the radio continuum and
sub-mm for NGC 3044 and in the radio continuum for NGC 4157, including several
new features. The dust spectrum at long wavelengths required fitting with a
two-temperature model for both galaxies, implying the presence of cold dust.
Dust masses are $M_d\,=\,1.6\,\times\,10^8 M_\odot$ and
$M_d\,=\,2.1\,\times\,10^7 M_\odot$ for NGC 3044 and NGC 4157, respectively,
and are dominated by the cold component. There is a clear correlation between
the 617 MHz and $\lambda\,850 \mu$m emission in the two galaxies. In the case
of NGC 3044, this implies a relation between the non-thermal synchrotron
emission and cold dust. The 617 MHz component represents an integration of
massive star formation over the past $10^{7-8}$ yr and the $\lambda \,850 \mu$m
emission represents heating from the diffuse interstellar radiation field
(ISRF). The 617 MHz -- $\lambda\,850 \mu$m correlation improves when a
smoothing kernel is applied to the $\lambda\,850 \mu$m data to account for
differences between the CR electron diffusion scale and the mean free path of
an ISRF photon to dust. The best-fit relation is $L_{617_{\rm
MHz}}\,\propto\,{L_{850 \mu{\rm m}}}^{2.1\,\pm\,0.2}$ for NGC 3044. If
variations in the cold dust emissivity are dominated by variations in dust
density, and the synchrotron emission depends on magnetic field strength (a
function of gas density) as well as CR electron generation (a function of
massive star formation rate and therefore density via the Schmidt law) then the
expected correlation for NGC 3044 is $L_{617_{\rm MHz}}\,\propto\,{L_{850
\mu{\rm m}}}^{2.2}$, in agreement with the observed correlation.


title:
High Order Asymptotic Preserving DG-IMEX Schemes for Discrete-Velocity
  Kinetic Equations in a Diffusive Scaling

abstract:
  In this paper, we develop a family of high order asymptotic preserving
schemes for some discrete-velocity kinetic equations under a diffusive scaling,
that in the asymptotic limit lead to macroscopic models such as the heat
equation, the porous media equation, the advection-diffusion equation, and the
viscous Burgers equation. Our approach is based on the micro-macro
reformulation of the kinetic equation which involves a natural decomposition of
the equation to the equilibrium and non-equilibrium parts. To achieve high
order accuracy and uniform stability as well as to capture the correct
asymptotic limit, two new ingredients are employed in the proposed methods:
discontinuous Galerkin spatial discretization of arbitrary order of accuracy
with suitable numerical fluxes; high order globally stiffly accurate
implicit-explicit Runge-Kutta scheme in time equipped with a properly chosen
implicit-explicit strategy. Formal asymptotic analysis shows that the proposed
scheme in the limit of epsilon -> 0 is an explicit, consistent and high order
discretization for the limiting equation. Numerical results are presented to
demonstrate the stability and high order accuracy of the proposed schemes
together with their performance in the limit.


title:
Quantum discord for two-qubit X states: Analytical formula with very
  small worst-case error

abstract:
  Quantum discord is a measure of quantum correlation beyond entanglement.
Computing quantum discord for simple quantum states is a basic problem. An
analytical formula of quantum discord for two-qubit X states is first claimed
in [Ali, Rau, and Alber, Phys. Rev. A 81, 042105 (2010)], but later found to be
not always correct. I observe numerically that the formula is valid with
worst-case absolute error 0.0021. For symmetric two-qubit X states, I give a
counterexample to the analytical formula derived in [F. F. Fanchini et al.,
Phys. Rev. A 81, 052107 (2010)], but observe that the formula is valid with
worst-case absolute error 0.0006. The formula has been used in many research
papers. The results in all these works are approximately correct, even if they
may not be exactly correct.


title: Characterization of the degree of Musical non-Markovianity

abstract:
  Recently, as an aid for musical analysis, in computational musicology
mathematical and informatics tools have been developed to quantitatively
characterize some aspects of musical compositions. To a musical composition can
be attributed by ear a certain amount of memory. This results associated to
repetitions and similarities of the patterns in musical scores. To higher
variations, a lower amount of memory is perceived. However musical memory of a
score has never been quantitatively defined. Here we aim to give such a measure
following an approach similar to that used in Physics to quantify the memory
(non-Markovianity) of open quantum systems. We have applied this measure to
some existing musical compositions, showing that the results obtained via this
quantifier agree with what one expects by ear. The Musical non-Markovianity
quantifier can thus be used as a new tool that can aid quantitative musical
analysis.


title:
Spin relaxation mechanism in graphene: resonant scattering by magnetic
  impurities

abstract:
  It is proposed that the observed small (100 ps) spin relaxation time in
graphene is due to resonant scattering by local magnetic moments. At
resonances, magnetic moments behave as spin hot spots: the spin-flip scattering
rates are as large as the spin-conserving ones, as long as the exchange
interaction is greater than the resonance width. Smearing of the resonance
peaks by the presence of electron-hole puddles gives quantitative agreement
with experiment, for about 1 ppm of local moments. While the local moments can
come from a variety of sources, we specifically focus on hydrogen adatoms. We
perform first-principles supercell calculations and introduce an effective
Hamiltonian to obtain realistic input parameters for our mechanism.


title:
An improved algorithm and a Fortran 90 module for computing the conical
  function $P^m_{-1/2+i\tau}(x)$

abstract:
  In this paper we describe an algorithm and a Fortran 90 module ({\bf
Conical}) for the computation of the conical function
$P^m_{-\tfrac12+i\tau}(x)$ for $x>-1$, $m \ge 0$, $\tau >0$. These functions
appear in the solution of Dirichlet problems for domains bounded by cones;
because of this, they are involved in a large number of applications in
Engineering and Physics.
  In the Fortran 90 module, the admissible parameter ranges for computing the
conical functions in standard IEEE double precision arithmetic are restricted
to $(x,m,\tau) \in (-1,1) \times [0,\,40] \times [0,\,100]$ and $(x,m,\tau) \in
(1,100) \times [0,\,100] \times [0,\,100]$. Based on tests of the three-term
recurrence relation satisfied by these functions and direct comparison with
Maple, we claim a relative accuracy close to $10^{-12}$ in the full parameter
range, although a mild loss of accuracy can be found at some points of the
oscillatory region of the conical functions. The relative accuracy increases to
$10^{-13}\,-\,10^{-14}$ in the region of the monotonic regime of the functions
where integral representations are computed ($-1<x<0$).


title:
Fixed points for nilpotent actions on the plane and the
  Cartwright-Littlewood theorem

abstract:
  The goal of this paper is proving the existence and then localizing global
fixed points for nilpotent groups generated by homeomorphisms of the plane
satisfying a certain Lipschitz condition. The condition is inspired in a
classical result of Bonatti for commuting diffeomorphisms of the 2-sphere and
in particular it is satisfied by diffeomorphisms, not necessarily of class
$C^{1}$, whose linear part at every point is uniformly close to the identity.
In this same setting we prove a version of the Cartwright-Littlewood theorem,
obtaining fixed points in any continuum preserved by a nilpotent action.


title:
Scale-Free Networks with the Same Degree Distribution: Different
  Structural Properties

abstract:
  We have analysed some structural properties of scale-free networks with the
same degree distribution. Departing from a degree distribution obtained from
the Barab\'asi-Albert (BA) algorithm, networks were generated using four
additional different algorithms a (Molloy-Reed, Kalisky, and two new models
named A and B) besides the BA algorithm itself. For each network, we have
calculated the following structural measures: average degree of the nearest
neighbours, central point dominance, clustering coefficient, the Pearson
correlation coefficient, and global efficiency. We found that different
networks with the same degree distribution may have distinct structural
properties. In particular, model B generates decentralized networks with a
larger number of components, a smaller giant component size, and a low global
efficiency when compared to the other algorithms, especially compared to the
centralized BA networks that have all vertices in a single component, with a
medium to high global efficiency. The other three models generate networks with
intermediate characteristics between B and BA models. A consequence of this
finding is that the dynamics of different phenomena on these networks may
differ considerably.

categories: cs.SI cond-mat.dis-nn cond-mat.stat-mech math.DS physics.soc-ph


title: Topologie des vari\'et\'es alg\'ebriques r\'eelles de dimension 3

abstract:
  We review the state of the art of the classification of real uniruled
threefolds


title:
Sur la mod\'elisation de l'interaction entre polarons et cristaux
  quantiques

abstract:
  This text is a summary (in french) of recent works in collaboration with
Mathieu Lewin, on the modelling of polarons in quantum crystals.


title: Isotropic realizability of electric fields around critical points

abstract:
  In this paper we study the isotropic realizability of a given regular
gradient field $\nabla u$ as an electric field, namely when $\nabla u$ is
solution of the equation $\div\left(\si\nabla u\right)=0$ for some isotropic
conductivity $\si>0$. The case of a function $u$ without critical point was
investigated in \cite{BMT} thanks to a gradient flow approach. The presence of
a critical point needs a specific treatment according to the behavior of the
dynamical system around the point. The case of a saddle point is the most
favorable and leads us to a characterization of the local isotropic
realizability through some boundedness condition involving the laplacian of $u$
along the gradient flow. The case of a sink or a source implies a strong
maximum principle under the same boundedness condition. However, when the
critical point is not hyperbolic the isotropic realizability is not generally
satisfied even piecewisely in the neighborhood of the point. The isotropic
realizability in the torus for periodic gradient fields is also discussed in
particular when the trajectories of the gradient system are bounded.


title: Guided Random Forest in the RRF Package

abstract:
  Random Forest (RF) is a powerful supervised learner and has been popularly
used in many applications such as bioinformatics.
  In this work we propose the guided random forest (GRF) for feature selection.
Similar to a feature selection method called guided regularized random forest
(GRRF), GRF is built using the importance scores from an ordinary RF. However,
the trees in GRRF are built sequentially, are highly correlated and do not
allow for parallel computing, while the trees in GRF are built independently
and can be implemented in parallel. Experiments on 10 high-dimensional gene
data sets show that, with a fixed parameter value (without tuning the
parameter), RF applied to features selected by GRF outperforms RF applied to
all features on 9 data sets and 7 of them have significant differences at the
0.05 level. Therefore, both accuracy and interpretability are significantly
improved. GRF selects more features than GRRF, however, leads to better
classification accuracy. Note in this work the guided random forest is guided
by the importance scores from an ordinary random forest, however, it can also
be guided by other methods such as human insights (by specifying $\lambda_i$).
GRF can be used in "RRF" v1.4 (and later versions), a package that also
includes the regularized random forest methods.


title:
Constraints on the general solutions of Einstein cosmological equations
  by Hubble parameter times cosmic age: a historical perspective

abstract:
  In a historical perspective, compact solutions of Einstein's equations,
including the cosmological constant and the curvature terms, are obtained,
starting from two recent observational estimates of the Hubble's parameter (H0)
and the "age" of the universe (t0). Cosmological implications for {\Lambda}CDM
({\Lambda} Cold Dark Matter), KOFL (k Open Friedman-Lemaitre), plus two mixed
solutions are investigated, under the constraints imposed by the relatively
narrow current uncertainties. Quantitative results obtained for the KOFL case
seem to be compatible with matter density and the highest observed red-shifts
from distant galaxies, while those obtained for the {\Lambda}CDM may be more
difficult to reconcile.


title: Deep Learning using Linear Support Vector Machines

abstract:
  Recently, fully-connected and convolutional neural networks have been trained
to achieve state-of-the-art performance on a wide variety of tasks such as
speech recognition, image classification, natural language processing, and
bioinformatics. For classification tasks, most of these "deep learning" models
employ the softmax activation function for prediction and minimize
cross-entropy loss. In this paper, we demonstrate a small but consistent
advantage of replacing the softmax layer with a linear support vector machine.
Learning minimizes a margin-based loss instead of the cross-entropy loss. While
there have been various combinations of neural nets and SVMs in prior art, our
results using L2-SVMs show that by simply replacing softmax with linear SVMs
gives significant gains on popular deep learning datasets MNIST, CIFAR-10, and
the ICML 2013 Representation Learning Workshop's face expression recognition
challenge.


title: Deformations of period lattices of flexible polyhedral surfaces

abstract:
  In the end of the 19th century Bricard discovered a phenomenon of flexible
polyhedra, that is, polyhedra with rigid faces and hinges at edges that admit
non-trivial flexes. One of the most important results in this field is a
theorem of Sabitov asserting that the volume of a flexible polyhedron is
constant during the flexion. In this paper we study flexible polyhedral
surfaces in the 3-space two-periodic with respect to translations by two
non-colinear vectors that can vary continuously during the flexion. The main
result is that the period lattice of a flexible two-periodic surface
homeomorphic to a plane cannot have two degrees of freedom.


title: Characterization of a cryogenic beam source for atoms and molecules

abstract:
  We present a combined experimental and theoretical study of beam formation
from a cryogenic buffer gas cell. Atoms and molecules are loaded into the cell
by laser ablation of a target, and are cooled and swept out of the cell by a
flow of cold helium. We study the thermalization and flow dynamics inside the
cell and measure how the speed, temperature, divergence and extraction
efficiency of the beam are influenced by the helium flow. We use a finite
element model to simulate the flow dynamics and use the predictions of this
model to interpret our experimental results.


title: On lattices, distinct distances, and the Elekes-Sharir framework

abstract:
  In this note we consider distinct distances determined by points in an
integer lattice. We first consider Erdos's lower bound for the square lattice,
recast in the setup of the so-called Elekes-Sharir framework \cite{ES11,GK11},
and show that, without a major change, this framework \emph{cannot} lead to
Erdos's conjectured lower bound. This shows that the upper bound of Guth and
Katz \cite{GK11} for the related 3-dimensional line-intersection problem is
tight for this instance. The gap between this bound and the actual bound of
Erdos arises from an application of the Cauchy-Schwarz inequality (which is an
integral part of the Elekes-Sharir framework). Our analysis relies on two
number-theoretic results by Ramanujan.
  We also consider distinct distances in rectangular lattices of the form
$\{(i,j) \mid 0\le i\le n^{1-\alpha},\ 0\le j\le n^{\alpha}\}$, for some
$0<\alpha<1/2$, and show that the number of distinct distances in such a
lattice is $\Theta(n)$. In a sense, our proof "bypasses" a deep conjecture in
number theory, posed by Cilleruelo and Granville \cite{CG07}. A positive
resolution of this conjecture would also have implied our bound.


title: Testing Convergence for Global Accretion Disks

abstract:
  Global disk simulations provide a powerful tool for investigating accretion
and the underlying magnetohydrodynamic turbulence driven by the
magneto-rotational instability (MRI). Using them to predict accurately
quantities such as stress, accretion rate, and surface brightness profile
requires that purely numerical effects, arising from both resolution and
algorithm, be understood and controlled. We use the flux-conservative Athena
code to conduct a series of experiments on disks having a variety of magnetic
topologies to determine what constitutes adequate resolution. We develop and
apply several resolution metrics: Qz and Qphi, the ratio of the grid zone size
to the characteristic MRI wavelength, alpha_mag, the ratio of the Maxwell
stress to the magnetic pressure, and the ratio of radial to toroidal magnetic
field energy. For the initial conditions considered here, adequate resolution
is characterized by Qz > 15, Qphi > 20, alpha_mag = 0.45, and a field energy
ratio of 0.2. These values are associated with > 35 zones per scaleheight, a
result consistent with shearing box simulations. Numerical algorithm is also
important. Use of the HLLE flux solver or second-order interpolation can
significantly degrade the effective resolution compared to the HLLD flux solver
and third-order interpolation. Resolution at this standard can be achieved only
with large numbers of grid zones, arranged in a fashion that matches the
symmetries of the problem and the scientific goals of the simulation.


title: Projective geometries in exponentially dense matroids. II

abstract:
  We show for each positive integer $a$ that, if $\mathcal{M}$ is a
minor-closed class of matroids not containing all rank-$(a+1)$ uniform
matroids, then there exists an integer $c$ such that either every rank-$r$
matroid in $\mathcal{M}$ can be covered by at most $r^c$ rank-$a$ sets, or
$\mathcal{M}$ contains the GF$(q)$-representable matroids for some prime power
$q$ and every rank-$r$ matroid in $\mathcal{M}$ can be covered by at most
$cq^r$ rank-$a$ sets. In the latter case, this determines the maximum density
of matroids in $\mathcal{M}$ up to a constant factor.


title:
Interband spin-orbit coupling between anti-parallel spin states in Pb
  quantum well states

abstract:
  Using spin and angle-resolved photoemission spectroscopy we investigate a
momentum region in Pb quantum well states on Si(111) where hybridization
between Rashba-split bands alters the band structure significantly. Starting
from the Rashba regime where the dispersion of the quasi-free two-dimensional
electron gas is well described by two spin-polarized parabolas, we find a
breakdown of the Rashba behavior which manifests itself (i) in a spin splitting
that is no longer proportional to the in-plane momentum and (ii) in a reversal
of the sign of the momentum splitting. Our experimental findings are well
explained by including interband spin-orbit coupling that mixes Rashba-split
states with anti-parallel rather than parallel spins. Similar results for
Pb/Cu(111) reveal that the proposed hybridization scenario is independent on
the supporting substrate.


title:
Geometry of the $L_q$-centroid bodies of an isotropic log-concave
  measure

abstract:
  We study some geometric properties of the $L_q$-centroid bodies $Z_q(\mu)$ of
an isotropic log-concave measure $\mu $ on ${\mathbb R}^n$. For any $2\ls
q\ls\sqrt{n}$ and for $\varepsilon \in (\varepsilon_0(q,n),1)$ we determine the
inradius of a random $(1-\varepsilon)n$-dimensional projection of $Z_q(\mu)$ up
to a constant depending polynomially on $\varepsilon $. Using this fact we
obtain estimates for the covering numbers
$N(\sqrt{\smash[b]{q}}B_2^n,tZ_q(\mu))$, $t\gr 1$, thus showing that $Z_q(\mu)$
is a $\beta $-regular convex body. As a consequence, we also get an upper bound
for $M(Z_q(\mu))$.


title:
Differential function spectra, the differential Becker-Gottlieb
  transfer, and applications to differential algebraic K-theory

abstract:
  We develop differential algebraic K-theory for rings of integers in number
fields and we construct a cycle map from geometrized bundles of modules over
such a ring to the differential algebraic K-theory. We also treat some of the
foundational aspects of differential cohomology, including differential
function spectra and the differential Becker-Gottlieb transfer. We then state a
transfer index conjecture about the equality of the Becker-Gottlieb transfer
and the analytic transfer defined by Lott. In support of this conjecture, we
derive some non-trivial consequences which are provable by independent means.


title: Lower bound for the maximum of some derivative of Hardy's function

abstract:
  Under the Riemann hypothesis, we use the distribution of zeros of the zeta
function to get a lower bound for the maximum of some derivative of Hardy's
function.


title: Performance of the Muon Identification at LHCb

abstract:
  The performance of the muon identification in LHCb is extracted from data
using muons and hadrons produced in J/\psi->\mu\mu, \Lambda->p\pi and
D^{\star}->\pi D0(K\pi) decays. The muon identification procedure is based on
the pattern of hits in the muon chambers. A momentum dependent binary
requirement is used to reduce the probability of hadrons to be misidentified as
muons to the level of 1%, keeping the muon efficiency in the range of 95-98%.
As further refinement, a likelihood is built for the muon and non-muon
hypotheses. Adding a requirement on this likelihood that provides a total muon
efficiency at the level of 93%, the hadron misidentification rates are below
0.6%.


title:
Application of the Space-Time Method to Stimulated Raman Adiabatic
  Passage on the Simple Harmonic Oscillator

abstract:
  The space-time method is applied to a model system-the Simple Harmonic
Oscillator in a laser field to simulate the Stimulated Raman Adiabatic Passage
(STIRAP) process. The Space-Time method is a computational theory first
introduced by Weatherford et. al. to solve Time-Dependent Systems with one
boundary value and applied to electron spin system with invariant Hamiltonian
[Journal of Molecular Structure {\bf 592} 47]. The implementation in the
present work provides an efficient and general way to solve the Time-Dependent
Schr{\"o}dinger Equation and can be applied to multi-state systems. The
algorithm for simulating the Simple Harmonic Oscillator STIRAP can be applied
to solve STIRAP problems for complex systems.


title:
Innerness of continuous derivations on algebras of measurable operators
  affiliated with finite von Neumann algebras

abstract:
  This paper is devoted to derivations on the algebra $S(M)$ of all measurable
operators affiliated with a finite von Neumann algebra $M.$ We prove that if
$M$ is a finite von Neumann algebra with a faithful normal semi-finite trace
$\tau$, equipped with the locally measure topology $t,$ then every
$t$-continuous derivation $D:S(M)\rightarrow S(M)$ is inner. A similar result
is valid for derivation on the algebra $S(M,\tau)$ of $\tau$-measurable
operators equipped with the measure topology $t_{\tau}$.


title: Q-balls and the chiral vortical effect

abstract:
  The paper considers the possibility of the existence of the axial current,
that is directed along the axis of rotation and arises due to the presence of
the Q-ball.


title: Game of Life on Phyllosilicates: Gliders, Oscillators and Still Life

abstract:
  A phyllosilicate is a sheet of silicate tetrahedra bound by basal oxygens. A
phyllosilicate automaton is a regular network of finite state machines ---
silicon nodes and oxygen nodes --- which mimics structure of the
phyllosilicate. A node takes states 0 and 1. Each node updates its state in
discrete time depending on a sum of states of its three (silicon) or six
(oxygen) neighbours. Phyllosilicate automata exhibit localizations attributed
to Conway's Game of Life: gliders, oscillators, still lifes, and a glider gun.
Configurations and behaviour of typical localizations, and interactions between
the localizations are illustrated.


title:
Central Limit Theorems for Classical Likelihood Ratio Tests for
  High-Dimensional Normal Distributions

abstract:
  For random samples of size n obtained from p-variate normal distributions, we
consider the classical likelihood ratio tests (LRT) for their means and
covariance matrices in the high-dimensional setting. These test statistics have
been extensively studied in multivariate analysis and their limiting
distributions under the null hypothesis were proved to be chi-square
distributions as n goes to infinity and p remains fixed. In this paper, we
consider the high-dimensional case where both p and n go to infinity with p=n/y
in (0, 1]. We prove that the likelihood ratio test statistics under this
assumption will converge in distribution to normal distributions with explicit
means and variances. We perform the simulation study to show that the
likelihood ratio tests using our central limit theorems outperform those using
the traditional chi-square approximations for analyzing high-dimensional data.


title: Generalised Particle Filters with Gaussian Mixtures

abstract:
  Stochastic filtering is defined as the estimation of a partially observed
dynamical system. A massive scientific and computational effort is dedicated to
the development of numerical methods for approximating the solution of the
filtering problem. Approximating the solution of the filtering problem with
Gaussian mixtures has been a very popular method since the 1970s (see
[1],[2],[46],[49]). Despite nearly fifty years of development, the existing
work is based on the success of the numerical implementation and is not
theoretically justified. This paper fills this gap and contains a rigorous
analysis of a new Gaussian mixture approximation to the solution of the
filtering problem. We deduce the L^2-convergence rate for the approximating
system and show some numerical example to test the new algorithm.


title: Distributions of Angles in Random Packing on Spheres

abstract:
  This paper studies the asymptotic behaviors of the pairwise angles among n
randomly and uniformly distributed unit vectors in R^p as the number of points
n -> infinity, while the dimension p is either fixed or growing with n. For
both settings, we derive the limiting empirical distribution of the random
angles and the limiting distributions of the extreme angles. The results reveal
interesting differences in the two settings and provide a precise
characterization of the folklore that "all high-dimensional random vectors are
almost always nearly orthogonal to each other". Applications to statistics and
machine learning and connections with some open problems in physics and
mathematics are also discussed.


title: Spatially distributed social complex networks

abstract:
  We propose a bare-bones stochastic model that takes into account both the
geographical distribution of people within a country and their complex network
of connections. The model, which is designed to give rise to a scale-free
network of social connections and to visually resemble the geographical spread
seen in satellite pictures of the Earth at night, gives rise to a power-law
distribution for the ranking of cities by population size (but for the largest
cities) and reflects the notion that highly connected individuals tend to live
in highly populated areas. It also yields some interesting insights regarding
Gibrat's law for the rates of city growth (by population size), in partial
support of the findings in a recent analysis of real data [Rozenfeld et al.,
Proc. Natl. Acad. Sci. U.S.A. 105, 18702 (2008)]. The model produces a
nontrivial relation between city population and city population density and a
superlinear relationship between social connectivity and city population, both
of which seem quite in line with real data.

categories: physics.soc-ph cond-mat.stat-mech cs.SI nlin.AO


title: Slime mould tactile sensor

abstract:
  Slime mould P. polycephalum is a single cells visible by unaided eye. The
cells shows a wide spectrum of intelligent behaviour. By interpreting the
behaviour in terms of computation one can make a slime mould based computing
device. The Physarum computers are capable to solve a range of tasks of
computational geometry, optimisation and logic. Physarum computers designed so
far lack of localised inputs. Commonly used inputs --- illumination and
chemo-attractants and -repellents --- usually act on extended domains of the
slime mould's body. Aiming to design massive-parallel tactile inputs for slime
mould computers we analyse a temporal dynamic of P. polycephalum's electrical
response to tactile stimulation. In experimental laboratory studies we discover
how the Physarum responds to application and removal of a local mechanical
pressure with electrical potential impulses and changes in its electrical
potential oscillation patterns.


title: On The Coordinated g-convex Dominated Functions

abstract:
  In this study, we define g-convex dominated functions on the co-ordinates and
prove some Hadamard-type, Fejer-type inequalities for this new class of
functions. We also give some results related to the functional H.


title:
A Distributed Algorithm for Solving Positive Definite Linear Equations
  over Networks with Membership Dynamics

abstract:
  This paper considers the problem of solving a symmetric positive definite
system of linear equations over a network of agents with arbitrary asynchronous
interactions and membership dynamics. The latter implies that each agent is
allowed to join and leave the network at any time, for infinitely many times,
and lose all its memory upon leaving. We develop Subset Equalizing (SE), a
distributed asynchronous algorithm for solving such a problem. To design and
analyze SE, we introduce a novel time-varying Lyapunov-like function, defined
on a state space with changing dimension, and a generalized concept of network
connectivity, capable of handling such interactions and membership dynamics.
Based on them, we establish the boundedness, asymptotic convergence, and
exponential convergence of SE, along with a bound on its convergence rate.
Finally, through extensive simulation, we show that SE is effective in a
volatile agent network and that a special case of SE, termed Groupwise
Equalizing, is significantly more bandwidth/energy efficient than two existing
algorithms in multi-hop wireless networks.


title: Propagators in two-dimensional lattices

abstract:
  This paper is devoted to the computation of discrete propagators in
two-dimensional crystals and their application to a number of time dependent
problems. The methods to compute such kernels are provided by a tight-binding
representation of Dirac matrices and the generalizations of Bessel functions.
Diffusive effects of point-like distributions on crystalline sheets are studied
in a second quantization scheme. In the last part, a compendium of propagators
is presented. The cases of square, triangular and hexagonal arrays are covered.


title:
Gauge invariant electromagnetic properties of fermions induced by CPT
  violation in the Standard Model Extension

abstract:
  Low-energy Lorentz-invariant quantities could receive contributions from a
fundamental theory producing small Lorentz-violating effects. Within the
Lorentz-violating extension of quantum electrodynamics, we investigate,
perturbatively, the contributions to the one-loop $ff\gamma$ vertex from the
$CPT$-violating axial coupling of a vector background field to fermions. We
find that the resulting vertex function has a larger set of Lorentz structures
than the one characterizing the usual, Lorentz invariant, parametrization of
the $ff\gamma$ vertex. We prove gauge invariance of the resulting one-loop
expression through a set of gauge invariant nonrenormalizable operators
introducing new-physics effects at the first and second orders in Lorentz
violation, and which generate tree-level contributions to the $ff\gamma$
vertex. Whereas loop contributions involving parameters that violate Lorentz
invariance at the first order are $CPT$-odd, those arising at the second order
are $CPT$-even, so that contributions to low-energy physics are restricted to
emerge for the first time at the second order. In this context, we derive a
contribution to anomalous magnetic moment of fermions, which we use to set a
bound on Lorentz violation.


title: Interacting Particle Systems in Time-Dependent Geometries

abstract:
  Many complex structures and stochastic patterns emerge from simple kinetic
rules and local interactions, and are governed by scale invariance properties
in combination with effects of the global geometry. We consider systems that
can be described effectively by space-time trajectories of interacting
particles, such as domain boundaries in two-dimensional growth or river
networks. We study trajectories embedded in time-dependent geometries, and the
main focus is on uniformly expanding or decreasing domains for which we obtain
an exact mapping to simple fixed domain systems while preserving the local
scale invariance properties. This approach was recently introduced in [A. Ali
et al., Phys. Rev. E 87, 020102(R) (2013)] and here we provide a detailed
discussion on its applicability for self-affince Markovian models, and how it
can be adapted to self-affine models with memory or explicit time dependence.
The mapping corresponds to a non-linear time transformation which convergences
to a finite value for a large class of trajectories, enabling an exact analysis
of asymptotic properties in expanding domains. We further provide a detailed
discussion of different particle interactions and generalized geometries. All
our findings are based on exact computations and are illustrated numerically
for various examples, including L\'evy processes and fractional Brownian
motion.


title: Epidemic-like Proximity-based Traffic Offloading

abstract:
  Cellular networks are overloaded due to the mobile traffic surge, and mobile
social network (MSNets) carrying information flow can help reduce cellular
traffic load. If geographically-nearby users directly adopt WiFi or Bluetooth
technology (i.e., leveraging proximity-based communication) for information
spreading in MSNets, a portion of mobile traffic can be offloaded from cellular
networks. For many delay-tolerant applications, it is beneficial for traffic
offloading to pick some seed users as information sources, which help further
spread the information to others in an epidemic-like manner using
proximity-based communication. In this paper, we develop a theoretical
framework to study the issue of choosing only k seed users so as to maximize
the mobile traffic offloaded from cellular networks via proximity-based
communication. We introduce a gossip-style social cascade (GSC) model to model
the information diffusion process, which captures the epidemic-like nature of
proximity-based communication and characterizes users' social participation as
well. For static networks as a special-case study and mobile networks, we
establish an equivalent view and a temporal mapping of the information
diffusion process, respectively, leveraging virtual coupon collectors. We
further prove the submodularity in the information diffusion and propose a
greedy algorithm to choose the seed users for proximity-based traffic
offloading, yielding a solution within about 63% of the optimal value to the
traffic offloading maximization (TOM) problem. Experiments are carried out to
study the offloading performance of our approach, illustrating that
proximity-based communication can offload cellular traffic by over 60% with a
small number of seed users and the greedy algorithm significantly outperforms
the heuristic and random algorithms.


title:
Multi-frequency subspace migration for imaging of perfectly conducting,
  arc-like cracks

abstract:
  Multi-frequency subspace migration imaging technique are usually adopted for
the non-iterative imaging of unknown electromagnetic targets such as cracks in
the concrete walls or bridges, anti-personnel mines in the ground, etc. in the
inverse scattering problems. It is confirmed that this technique is very fast,
effective, robust, and can be applied not only full- but also limited-view
inverse problems if suitable number of incident and corresponding scattered
field are applied and collected. But in many works, the application of such
technique is somehow heuristic. Under the motivation of such heuristic
application, this contribution analyzes the structure of imaging functional
employed in the subspace migration imaging technique in two-dimensional inverse
scattering when the unknown target is arbitrary shaped, arc-like perfectly
conducting cracks located in the homogeneous two-dimensional space. Opposite to
the Statistical approach based on the Statistical Hypothesis Testing, our
approach is based on the fact that subspace migration imaging functional can be
expressed by a linear combination of Bessel functions of integer order of the
first kind. This is based on the structure of the Multi-Static Response (MSR)
matrix collected in the far-field at nonzero frequency in either Transverse
Magnetic (TM) mode or Transverse Electric (TE) mode. Explored expression of
imaging functionals gives us certain properties of subspace migration and an
answer of why multi-frequency enhances imaging resolution. Particularly, we
carefully analyze the subspace migration and confirm some properties of imaging
when a small number of incident field is applied. Consequently, we simply
introduce a weighted multi-frequency imaging functional and confirm that which
is an improved version of subspace migration in TM mode.


title:
Predicted alternative structure for tantalum metal under high pressure
  and high temperature

abstract:
  First-principles simulations have been performed to investigate the phase
stability of tantalum metal under high pressure and high temperature (HPHT). We
searched its low-energy structures globally using our developed multi-algorithm
collaborative (MAC) crystal structure prediction technique. The body-centred
cubic (bcc) was found to be stable at pressure up to 300 GPa. The previously
reported $\omega$ and \textit{A}15 structures were also reproduced
successfully. More interestingly, we observed another phase (space group:
\textit{Pnma}, 62) that is more stable than $\omega$ and \textit{A}15. Its
stability is confirmed by its phonon spectra and elastic constants. For
$\omega$-Ta, the calculated elastic constants and high-temperature phonon
spectra both imply that it is neither mechanically nor dynamically stable.
Thus, $\omega$ is not the structure to which bcc-Ta transits before melting. On
the contrary, the good agreement of \textit{Pnma}-Ta shear sound velocities
with experiment suggests \textit{Pnma} is the new structure of Ta implied by
the discontinuation of shear sound velocities in recent shock experiment [J.
Appl. Phys. \textbf{111}, 033511 (2012)].


title: Locality statistics for anomaly detection in time series of graphs

abstract:
  The ability to detect change-points in a dynamic network or a time series of
graphs is an increasingly important task in many applications of the emerging
discipline of graph signal processing. This paper formulates change-point
detection as a hypothesis testing problem in terms of a generative latent
position model, focusing on the special case of the Stochastic Block Model time
series. We analyze two classes of scan statistics, based on distinct underlying
locality statistics presented in the literature. Our main contribution is the
derivation of the limiting distributions and power characteristics of the
competing scan statistics. Performance is compared theoretically, on synthetic
data, and on the Enron email corpus. We demonstrate that both statistics are
admissible in one simple setting, while one of the statistics is inadmissible a
second setting.


title: Intermediate-Age Stellar Populations in Classical QSO Host Galaxies

abstract:
  Although mergers and starbursts are often invoked in the discussion of QSO
activity in the context of galaxy evolution, several studies have questioned
their importance or even their presence in QSO host galaxies. Accordingly, we
are conducting a study of z~0.2 QSO host galaxies previously classified as
passively evolving elliptical galaxies. We present deep Keck LRIS spectroscopy
of a sample of 15 hosts and model their stellar absorption spectra using
stellar synthesis models. The high S/N of our spectra allow us to break various
degeneracies that arise from different combinations of models, varying
metallicities, and contamination from QSO light. We find that none of the host
spectra can be modeled by purely old stellar populations and that the majority
of the hosts (14/15) have a substantial contribution from intermediate-age
populations with ages ranging from 0.7 to 2.4 Gyr. An average host spectrum is
strikingly well fit by a combination of an old population and a 2.1 (+0.5,
-0.7) Gyr population. The morphologies of the host galaxies suggest that these
aging starbursts were induced during the early stages of the mergers that
resulted in the elliptical-shaped galaxies that we observe. The current AGN
activity likely corresponds to the late episodes of accretion predicted by
numerical simulations, which occur near the end of the mergers, whereas earlier
episodes may be more difficult to observe due to obscuration. Our off-axis
observations prevent us from detecting any current star formation or young
stellar populations that may be present in the central few kiloparsecs.


title: Experimental measurements of stress redistribution in flowing emulsions

abstract:
  We study how local rearrangements alter droplet stresses within flowing dense
quasi-two-dimensional emulsions at area fractions $\phi \geq 0.88$. Using
microscopy, we measure droplet positions while simultaneously using their
deformed shape to measure droplet stresses. We find that rearrangements alter
nearby stresses in a quadrupolar pattern: stresses on neighboring droplets tend
to either decrease or increase depending on location. The stress redistribution
is more anisotropic with increasing $\phi$. The spatial character of the stress
redistribution influences where subsequent rearrangements occur. Our results
provide direct quantitative support for rheological theories of dense amorphous
materials that connect local rearrangements to changes in nearby stress.


title:
Study of spatial resolution in a single GEM simulated by Monte-Carlo
  method

abstract:
  Spatial resolution is a significant factor in the GEM performance in view of
X-rays radiography and UV, visible light imaging. Monte-Carlo method is used to
investigate the spatial resolution determined by the transverse diffusion in
the device. The simulation results indicate that the electrical parameters,
such as the GEM voltages and the electric field at the drift and induction
regions, only have minor effects on the spatial resolution. The geometrical
parameters and the working gases chosen, on the other hand, are the main
parameters that determine the spatial resolution. The spatial resolution is
determined more on the drift and diffusion processes than on the avalanche
process. Especially for the different working gases, the square root function
of the ratio of the electron diffusion coefficient and the mobility has a
significant effect on the spatial resolution.


title:
KERT: Automatic Extraction and Ranking of Topical Keyphrases from
  Content-Representative Document Titles

abstract:
  We introduce KERT (Keyphrase Extraction and Ranking by Topic), a framework
for topical keyphrase generation and ranking. By shifting from the
unigram-centric traditional methods of unsupervised keyphrase extraction to a
phrase-centric approach, we are able to directly compare and rank phrases of
different lengths. We construct a topical keyphrase ranking function which
implements the four criteria that represent high quality topical keyphrases
(coverage, purity, phraseness, and completeness). The effectiveness of our
approach is demonstrated on two collections of content-representative titles in
the domains of Computer Science and Physics.


title:
One can hear the area and curvature of boundary of a domain by hearing
  the Steklov eigenvalues

abstract:
  For a given bounded domain $\Omega$ with smooth boundary in a smooth
Riemannian manifold $(\mathcal{M},g)$, we show that the Poisson type
upper-estimate of the heat kernel associated to the Dirichlet-to-Neumann
operator, the Sobolev trace inequality, the Log-Sobolev trace inequality, the
Nash trace inequality, and the Rozenblum-Lieb-Cwikel type inequality are all
equivalent. Upon decomposing the Dirichlet-to-Neumann operator into a sum of
the square root of the Laplacian and a pseudodifferntial operator and by
applying Grubb's method of symbolic calculus for the corresponding
pseudodifferential heat kernel operators, we establish a procedure to calculate
all the coefficients of the asymptotic expansion of the trace of the heat
kernel associated to Dirichlet-to-Neumann operator as $t\to 0^+$. In
particular, we explicitly give the first four coefficients of this asymptotic
expansion. These coefficients give precise information regarding the area and
curvatures of the boundary of the domain in terms of the spectrum of the
Steklov problem.


title: The spectral variability of quasar SDSS J030639.57+000343.1

abstract:
  We compiled a sample of 60 quasars with spectroscopy on at least six epochs
from the Sloan Digital Sky Survey (SDSS) to study the variabilities of the
spectral shape, the continuum and the emission lines luminosity. In this paper,
we present the results of SDSS J030639.57+000343.1. We found a strong
anti-correlation between the continuum luminosity at $5100 \AA$ and the
spectral index, implying a bluer-when-brighter trend. The luminosity of the
broad $\rm H_\alpha$ line is proportion to the continuum luminosity at $5100
\AA$. Correspondingly, we did not find strong correlation between the
equivalent width of broad $\rm H\alpha$ and the continuum luminosity, i.e. no
baldwin effect of broad $\rm H\alpha$ in this source.


title:
A long-term VLBA monitoring campaign of the v=1, J=1-0 SiO masers toward
  TX Cam - I. Morphology and Shock Waves

abstract:
  We present the latest and final version of the movie of the SiO masers toward
the Mira variable TX Cam. The new version consists of 112 frames (78
successfully reduced epochs) with data covering almost three complete stellar
cycles between 24 May 1997 to 25 January 2002, observed with the VLBA. In this
paper we examine the global morphology, kinematics and variability of the
masering zone. The morphology of the emission is confined in a structure that
usually resembles a ring or an ellipse, with occasional deviations due to
localised phenomena. The ring appears to be contracting and expanding, although
for the first cycle contraction is not observed. The width and outer boundary
of the masering zone follow the stellar pulsation. Our data seem to be
consistent with a shock being created once per stellar cycle at maximum that
propagates with a velocity of ~7 km/s. The difference in velocities along
different axes strongly suggests that the outflow in TX Cam is bipolar. The
contribution of projection is examined and our results are compared with the
latest theoretical model.


title:
GASPS - a Herschel survey of gas and dust in Protoplanetary Disks:
  Summary and Initial Statistics

abstract:
  GASPS is a far-infrared line and continuum survey of protoplanetary and young
debris disks using PACS on the Herschel Space Observatory. The survey includes
[OI] at 63 microns, as well as 70, 100 and 160um continuum, with the brightest
objects also studied in [OI]145um, [CII]157um, H2O and CO. Targets included T
Tauri stars and debris disks in 7 nearby young associations, and a sample of
isolated Herbig AeBe stars. The aim was to study the global gas and dust
content in a wide disk sample, systemically comparing the results with models.
In this paper we review the main aims, target selection and observing strategy.
We show initial results, including line identifications, sources detected, and
a first statistical study.
  [OI]63um was the brightest line in most objects, by a factor of ~10.
Detection rates were 49%, including 100% of HAeBe stars and 43% of T Tauri
stars. Comparison with published dust masses show a dust threshold for [OI]63um
detection of ~1e-5 M_solar. Normalising to 140pc distance, 32% with mass 1e-6 -
1e-5 M_solar, and a small number with lower mass were also detected. This is
consistent with moderate UV excess and disk flaring. In most cases, continuum
and line emission is spatially and spectrally unresolved, suggesting disk
emission. ~10 objects were resolved, likely from outflows. Detection rates in
[OI]145um, [CII]157um and CO J=18-17 were 20-40%, but [CII] was not correlated
with disk mass, suggesting it arises instead from a compact envelope.
  [OI] detection rates in T Tauri associations of ages 0.3-4Myr were ~50%. ~2
stars were detectable in associations of 5-20Myr, with no detections in
associations of age >20Myr. Comparing with the total number of young stars, and
assuming a ISM-like gas/dust ratio, this indicates that ~18% of stars retain a
gas-rich disk of total mass >1M_Jupiter for 1-4Myr, 1-7% keep such disks for
5-10Myr, and none remain beyond 10-20Myr.


title: Super sub-wavelength patterns in photon coincidence detection

abstract:
  High-precision measurements implemented by means of light is desired in all
fields of science. However, light is a wave and Rayleigh criterion gives us a
diffraction limitation in classical optics which restricts to get arbitrary
high resolution. Sub-wavelength interference has a potential application in
lithography to beat the classical Rayleigh limit of resolution. We carefully
study the second-order correlation theory to get the physics behind
sub-wavelength interference in photon coincidence detection. A Young's
double-slit experiment with pseudo-thermal light is carried out to test the
second-order correlation pattern. The result shows that when different scanning
ways of two point detectors are chosen, one can get super sub-wavelength
interference patterns. We then give a theoretical explanation to this
surprising result, and find this explanation is also suitable for the result by
using entangled light. Furthermore, we discuss the limitation of this kind of
super sub-wavelength interference patterns in quantum lithography.


title: Hardening transition in a one-dimensional model for ferrogels

abstract:
  We introduce and investigate a coarse-grained model for quasi one-dimensional
ferrogels. In our description the magnetic particles are represented by hard
spheres with a magnetic dipole moment in their centers. Harmonic springs
connecting these spheres mimic the presence of a cross-linked polymer matrix. A
special emphasis is put on the coupling of the dipolar orientations to the
elastic deformations of the matrix, where a memory effect of the orientations
is included. Although the particles are displaced along one spatial direction
only, the system already shows rich behavior: as a function of the magnetic
dipole moment, we find a phase transition between "soft-elastic" states with
finite interparticle separation and finite compressive elastic modulus on the
one hand, and "hardened" states with touching particles and therefore diverging
compressive elastic modulus on the other hand. Corresponding phase diagrams are
derived neglecting thermal fluctuations of the magnetic particles. In addition,
we consider a situation in which a spatially homogeneous magnetization is
initially imprinted into the material. Depending on the strength of the
magneto-mechanical coupling between the dipole orientations and the elastic
deformations, the system then relaxes to a uniaxially ferromagnetic, an
antiferromagnetic, or a spiral state of magnetization to minimize its energy.
One purpose of our work is to provide a largely analytically solvable approach
that can provide a benchmark to test future descriptions of higher complexity.
From an applied point of view, our results could be exploited, for example, for
the construction of novel damping devices of tunable shock absorbance.


title: Aboriginal Oral Traditions of Australian Impact Craters

abstract:
  We explore Aboriginal oral traditions that relate to Australian meteorite
craters. Using the literature, first-hand ethnographic records, and fieldtrip
data, we identify oral traditions and artworks associated with four impact
sites: Gosses Bluff, Henbury, Liverpool, and Wolfe Creek. Oral traditions
describe impact origins for Gosses Bluff, Henbury, and Wolfe Creek craters and
non-impact origins of Liverpool crater, with Wolfe Creek and Henbury having
both impact and non-impact origins in oral tradition. Three impact sites that
are believed to have formed during human habitation of Australia - Dalgaranga,
Veevers, and Boxhole - do not have associated oral traditions that are reported
in the literature.


title: Pair production of a 125 GeV Higgs boson in MSSM and NMSSM at the ILC

abstract:
  In this work we investigate the Higgs pair production in the MSSM and NMSSM
at the photon-photon collision of the ILC. We consider various experimental
constraints and scan over the parameter space of the MSSM and NMSSM. Then we
calculate the cross section of Higgs pair production in the allowed parameter
space and compare the results with the predictions in the SM. We find that the
large enhancement of the cross section in the MSSM is mainly due to the
contributions from the loops mediated by the stau, while in the NMSSM it is
mainly due to the contributions from the top-squark loops. For light
$m_{\tilde{\tau}_1}$ and large $\mu\tan\beta$, the production rate can be
enhanced by a factor of 18 in the MSSM (relative to the SM prediction). And for
a large trilinear soft breaking parameter $A_t$ and a moderately light
top-squark, it can also be enhanced by a factor of 2 in the NMSSM. Moreover, we
also calculate the $\chi^2$ values with the LHC Higgs data and display the
results for the parameter space with $\chi^2$ better than the SM value.


title: On sequences without geometric progressions

abstract:
  An improved upper bound is obtained for the density of sequences of positive
integers that contain no k-term geometric progression.


title: Classical Hardness of Learning with Errors

abstract:
  We show that the Learning with Errors (LWE) problem is classically at least
as hard as standard worst-case lattice problems, even with polynomial modulus.
Previously this was only known under quantum reductions.
  Our techniques capture the tradeoff between the dimension and the modulus of
LWE instances, leading to a much better understanding of the landscape of the
problem. The proof is inspired by techniques from several recent cryptographic
constructions, most notably fully homomorphic encryption schemes.


title:
An efficient method for evaluating BEM singular integrals on curved
  elements with application in acoustic analysis

abstract:
  The polar coordinate transformation (PCT) method has been extensively used to
treat various singular integrals in the boundary element method (BEM). However,
the resultant integrands of the PCT tend to become nearly singular when (1) the
aspect ratio of the element is large or (2) the field point is closed to the
element boundary; thus a large number of quadrature points are needed to
achieve a relatively high accuracy. In this paper, the first problem is
circumvented by using a conformal transformation so that the geometry of the
curved physical element is preserved in the transformed domain. The second
problem is alleviated by using a sigmoidal transformation, which makes the
quadrature points more concentrated around the near singularity.
  By combining the proposed two transformations with the Guiggiani's method in
[M. Guiggiani, \emph{et al}.
  A general algorithm for the numerical solution of hypersingular boundary
integral equations.
  \emph{ASME Journal of Applied Mechanics}, 59(1992), 604-614], one obtains an
efficient and robust numerical method for computing the weakly-, strongly- and
hyper-singular integrals in high-order BEM with curved elements. Numerical
integration results show that, compared with the original PCT, the present
method can reduce the number of quadrature points considerably, for given
accuracy. For further verification, the method is incorporated into a 2-order
Nystr\"om BEM code for solving acoustic Burton-Miller boundary integral
equation. It is shown that the method can retain the convergence rate of the
BEM with much less quadrature points than the existing PCT. The method is
implemented in C language and freely available.


title:
Belief propagation with multipoint correlations and its application to
  Inverse problem

abstract:
  We give explicit formulas of the Bethe approximation with multipoint
correlations for systems with magnetic field. The obtained formulas include the
closed form of the magnetization and the correlations between adjacent degrees
of freedom. On the basis of our results, we propose a new iterative algorithm
of the improved Bethe approximation. We confirm that the proposed technique is
available for the random spin systems and indeed gives more accurate locations
of the critical points. We discuss the possibility of the application of our
method to the Inverse Ising model by use of these equations.


title: Some Topics in Quantum Games

abstract:
  This work, based on the author's MA thesis, concentrates on simultaneous move
quantum games of two players. A numerical algorithm based on the method of best
response functions, designed to search for pure strategy Nash equilibrium in
quantum games is constructed. It is then used show that there is a critical
degree of entanglement above which a pure strategy Nash Equilibrium does not
exist. The behavior of the two payoffs approach the cooperative classical ones.
Bayesian quantum games are defined, and it is shown that under certain
conditions, there {\it is} a pure strategy Nash equilibrium in such games even
when entanglement is maximal. The basic ingredients of a quantum game based on
a two-players {\it three} decisions classical games are presented. This
requires the definition of trits (instead of bits) and quantum trits (instead
of quantum bits). It is shown that in this quantum game, there is no classical
commensurability in the sense that the classical strategies are not obtained as
a special case of the quantum strategies. An entanglement operator transforming
a pure two qutrit state into a maximally entangled one is explicitly
constructed.


title: Calibrating the fundamental plane with SDSS DR8 data

abstract:
  We present a calibration of the fundamental plane using SDSS Data Release 8.
We analysed about 93000 elliptical galaxies up to $z<0.2$, the largest sample
used for the calibration of the fundamental plane so far. We incorporated
up-to-date K-corrections and used GalaxyZoo data to classify the galaxies in
our sample. We derived independent fundamental plane fits in all five Sloan
filters u, g, r, i and z. A direct fit using a volume-weighted least-squares
method was applied to obtain the coefficients of the fundamental plane, which
implicitly corrects for the Malmquist bias. We achieved an accuracy of 15% for
the fundamental plane as a distance indicator. We provide a detailed discussion
on the calibrations and their influence on the resulting fits. These
re-calibrated fundamental plane relations form a well-suited anchor for
large-scale peculiar-velocity studies in the nearby universe. In addition to
the fundamental plane, we discuss the redshift distribution of the elliptical
galaxies and their global parameters.


title:
Inelastic transport dynamics through attractive impurity in charge Kondo
  regime

abstract:
  Within the frame of quantum dissipation theory, we develop a new hierarchical
equations of motion theory, combined with the small polaron transformation. We
fully investigate the electron transport of a single attractive impurity system
with the strong electron-phonon coupling in charge- Kondo regime. Numerical
results demonstrate the following facts: (i) The density of states curve shows
that the attraction mechanism results in not only the charge-Kondo resonance
(i.e. elastic pair-transition resonance), but also the inelastic
pair-transition resonances and inelastic cotunneling resonances. These signals
are separated discernibly in asymmetric levels about Fermi level; (ii) The
differential conductance spectrum shows the distinct peaks or wiggles and the
abnormal split of pair-transition peaks under the asymmetric bias; (iii) The
improvement of bath-temperature can enhance the phonon-emission
(absorption)-assisted sequential tunneling and also strengthen the signals of
inelastic pair-transition under the asymmetric bias; (iv) The inelastic
dynamics driven by the ramp-up time-dependent voltage presents clear steps
which can be tailored by the duration-time and bath-temperature; (v) The
linear-response spectrum obtained from the linear-response theory in the
Liouville space reveals the excitation signals of electrons' dynamical
transition. Briefly, the physics caused by attraction mechanism stems from the
double-occupancy or vacant-occupation of impurity system


title:
On the general homogenization of von Karman plate equations from 3D
  nonlinear elasticity

abstract:
  Starting from 3D elasticity equations we derive the model of the homogenized
von K\'arm\'an plate by means of $\Gamma$-convergence. This generalizes the
recent results, where the material oscillations were assumed to be periodic.


title:
Nitrogen and argon doping of niobium for superconducting radio frequency
  cavities: a pathway to highly efficient accelerating structures

abstract:
  We report a surface treatment that systematically improves the quality factor
of niobium radio frequency cavities beyond the expected limit for niobium. A
combination of annealing in a partial pressure of nitrogen or argon gas and
subsequent electropolishing of the niobium cavity surface leads to
unprecedented low values of the microwave surface resistance, and an
improvement in the efficiency of the accelerating structures up to a factor of
3, reducing the cryogenic load of superconducting cavities for both pulsed and
continuous duty cycles. The field dependence of the surface resistance is
reversed compared to standardly treated niobium.