title: Neutron rich nuclei and neutron stars

abstract:
  The PREX experiment at Jefferson Laboratory measures the neutron radius of
208Pb with parity violating electron scattering in a way that is free from most
strong interaction uncertainties. The 208Pb radius has important implications
for neutron rich matter and the structure of neutron stars. We present first
PREX results, describe future plans, and discuss a follow on measurement of the
neutron radius of 48Ca. We review radio and X-ray observations of neutron star
masses and radii. These constrain the equation of state (pressure versus
density) of neutron rich matter. We present a new energy functional that is
simultaneously fit to both nuclear and neutron star properties. In this
approach, neutron star masses and radii constrain the energy of neutron matter.
This avoids having to rely on model dependent microscopic calculations of
neutron matter. The functional is then used to predict the location of the drip
lines and the properties of very neutron rich heavy nuclei.


title:
Differences and similarities between Shape Dynamics and General
  Relativity

abstract:
  The purpose of this contribution is to elucidate some of the properties of
Shape Dynamics (SD) and is largely based on a recent longer article. We shall
point out some of the key differences between SD and related theoretical
constructions, illustrate the central mechanism of symmetry trading in
electromagnetism and finally point out some new quantization strategies
inspired by SD. We refrain from describing mathematical detail and from citing
literature. For both we refer to the longer article.


title: Magnetic field dependence of Raman coupling in Alkali atoms

abstract:
  We calculate the magnetic field dependence of Rabi rates for two-photon
optical Raman processes in alkali atoms. Due to a decoupling of the nuclear and
electronic spins, these rates fall with increasing field. At the typical
magnetic fields of alkali atom Feshbach resonances (B\sim 200G-1200G), the
Raman rates have the same order of magnitude as their zero field values,
suggesting one can combine Raman-induced gauge fields/spin-orbital coupling
with strong Feshbach-induced interactions. The exception is $^6$Li, where there
is a factor of 7 suppression in the Raman coupling, compared to its already
small zero-field value.


title: Simulating Quantum Magnetism with Correlated Non-Neutral Ion Plasmas

abstract:
  By employing forces that depend on the internal electronic state (or spin) of
an atomic ion, the Coulomb potential energy of a strongly coupled array of ions
can be modified in a spin-dependent way to mimic effective quantum spin
Hamiltonians. Both ferromagnetic and antiferromagnetic interactions can be
implemented. We use simple models to explain how the effective spin
interactions are engineered with trapped-ion crystals. We summarize the type of
effective spin interactions that can be readily generated, and discuss an
experimental implementation using single-plane ion crystals in a Penning trap.


title:
Influence of initial size on higher cumulant ratios of net-proton number
  fluctuations

abstract:
  With the help of AMPT default model, we study the influence of initial size
(centrality of collisions) on higher cumulant ratios of net-proton
distributions. If the centrality is presented by impact parameter, there is a
strong centrality dependent, in particular, in those peripheral collisions.
This dependence is slightly reduced if the centrality is presented by number of
participant, or charged multiplicity. However, the dynamical ratios are almost
centrality independent. So the centrality dependence of dynamical ratios at
RHIC beam energy scan are presented.


title: The NDL Equation of State for Supernova Simulations

abstract:
  We present an updated and improved equation of state (which we call the NDL
EoS) for use in neutron-star structure and supernova simulations. This EoS is
based upon a framework originally developed by Bowers & Wilson, but there are
numerous changes. Among them are: (1) a reformulation in the context of density
functional theory; (2) the possibility of the formation of material with a net
proton excess (Ye > 0.5); (3) an improved treatment of the nuclear statistical
equilibrium and the transition to heavy nuclei as the density approaches
nuclear matter density; (4) an improved treatment of the effects of pions in
the regime above nuclear matter density including the incorporation of all the
known mesonic and baryonic states at high temperature; (5) the effects of
3-body nuclear forces at high densities; and (6) the possibility of a
first-order or crossover transition to a QCD chiral symmetry restoration and
deconfinement phase at densities above nuclear matter density. This paper
details the physics of, and constraints on, this new EoS and describes its
implementation in numerical simulations. We show comparisons of this EoS with
other equations of state commonly used in supernova collapse simulations.


title:
Pattern formation in Hamiltonian systems with continuous spectra; a
  normal-form single-wave model

abstract:
  Pattern formation in biological, chemical and physical problems has received
considerable attention, with much attention paid to dissipative systems. For
example, the Ginzburg--Landau equation is a normal form that describes pattern
formation due to the appearance of a single mode of instability in a wide
variety of dissipative problems. In a similar vein, a certain "single-wave
model" arises in many physical contexts that share common pattern forming
behavior. These systems have Hamiltonian structure, and the single-wave model
is a kind of Hamiltonian mean-field theory describing the patterns that form in
phase space. The single-wave model was originally derived in the context of
nonlinear plasma theory, where it describes the behavior near threshold and
subsequent nonlinear evolution of unstable plasma waves. However, the
single-wave model also arises in fluid mechanics, specifically shear-flow and
vortex dynamics, galactic dynamics, the XY and Potts models of condensed matter
physics, and other Hamiltonian theories characterized by mean field
interaction. We demonstrate, by a suitable asymptotic analysis, how the
single-wave model emerges from a large class of nonlinear advection-transport
theories. An essential ingredient for the reduction is that the Hamiltonian
system has a continuous spectrum in the linear stability problem, arising not
from an infinite spatial domain but from singular resonances along curves in
phase space whereat wavespeeds match material speeds (wave-particle resonances
in the plasma problem, or critical levels in fluid problems). The dynamics of
the continuous spectrum is manifest as the phenomenon of Landau damping when
the system is ... Such dynamical phenomena have been rediscovered in different
contexts, which is unsurprising in view of the normal-form character of the
single-wave model.

categories: cond-mat.stat-mech math-ph math.MP nlin.PS


title: Pure Coordination using the Coordinator--Configurator Pattern

abstract:
  This work-in-progress paper reports on our efforts to improve different
aspects of coordination in complex, component-based robotic systems.
Coordination is a system level aspect concerned with commanding, configuring
and monitoring functional computations such that the system as a whole behaves
as desired. To that end a variety of models such as Petri-nets or Finite State
Machines may be utilized. These models specify actions to be executed, such as
invoking operations or configuring components to achieve a certain goal.
  This traditional approach has several disadvantages related to loss of
reusability of coordination models due to coupling with platform-specific
functionality, non-deterministic temporal behavior and limited robustness as a
result of executing platform operations within the context of the coordinator.
  To avoid these shortcomings, we propose to split this "rich" coordinator into
a Pure Coordinator and a Configurator. Although the coordinator remains in
charge of commanding and reacting, the execution of actions is deferred to the
Configurator. This pattern, called "Coordinator-Configurator", is implemented
as a novel Configurator domain specific language that can be used together with
any model of coordination. We illustrate the approach by refactoring an
existing application that realizes a safe haptic coupling of two youBot mobile
manipulators.


title:
The character and prevalence of third minima in actinide fission
  barriers

abstract:
  The double-humped structure of many actinide fission barriers is well
established both experimentally and theoretically. There is also evidence, both
experimental and theoretical, that some actinide nuclei have barriers with a
third minimum, outside the second, fission-isomeric minimum. We perform a
large-scale, systematic calculation of actinide fission barriers to identify
which actinide nuclei exhibit third minima. We find that only a relatively few
nuclei accessible to experiment exhibit third minima in their barriers,
approximately nuclei with proton number $Z$ in the range $88 \leq Z \leq 94$
and nucleon number $A$ in the range $230 \leq A \leq 236 $. We find that the
third minimum is less than 1 MeV deep for light Th and U isotopes. This is
consistent with some previous experimental and theoretical results, but differs
from some others. We discuss possible origins of these incompatible results and
what are the most realistic predictions of where third minima are observable.


title: Inequalities for the polar derivative of a polynomial

abstract:
  Let $ P(z) $ be a polynomial of degree $ n $ and for any real or complex
number $\alpha,$ let $D_\alpha P(z)=nP(z)+(\alpha-z)P^{\prime}(z)$ denote the
polar derivative with respect to $\alpha.$ In this paper, we obtain
generalizations of some inequalities for the polar derivative of a polynomial.


title:
Modified surface redshift of pulsars and magnetars by magnetized plasmas
  and vacuum polarization

abstract:
  The propagation of emissions in the relativistic streaming pair plasmas of
pulsars and magnetars is studied within the framework of Gordon effective
metric theory, and the effect of vacuum polarization on the radiation spectra
is examined particularly. It is found that the electromagnetic and kinetic
effects of streaming magnetized plasmas and the vacuum polarization effect can
shift the radiation spectra of stars. The modification of redshifts of spectra
can reach the same magnitude as the gravitational redshift in particular cases.
Moreover, the redshifts induced by the media are anisotropic and associated
with wave modes. For the O-mode, the modification of redshifts is dependent on
the frequency of the radiation. For lower-frequency radiation, the modification
is dominated by the plasma effect, while for higher-frequency radiations, by
the vacuum polarization effect. For the X-mode, the modification is
non-dispersive and dominated by the vacuum polarization effect. The vacuum
polarization also has a significant effect on the redshifts of X-ray emissions
in magnetars.


title: Entropy Distance

abstract:
  Motivated by the approach of random linear codes, a new distance in the
vector space over a finite field is defined as the logarithm of the "surface
area" of a Hamming ball with radius being the corresponding Hamming distance.
It is named entropy distance because of its close relation with entropy
function. It is shown that entropy distance is a metric for a non-binary field
and a pseudometric for the binary field. The entropy distance of a linear code
is defined to be the smallest entropy distance between distinct codewords of
the code. Analogues of the Gilbert bound, the Hamming bound, and the Singleton
bound are derived for the largest size of a linear code given the length and
entropy distance of the code. Furthermore, as an important property related to
lossless joint source-channel coding, the entropy distance of a linear encoder
is defined. Very tight upper and lower bounds are obtained for the largest
entropy distance of a linear encoder with given dimensions of input and output
vector spaces.


title: Proceedings 1st International Workshop on Strategic Reasoning

abstract:
  This volume contains the proceedings of the 1st International Workshop on
Strategic Reasoning 2013 (SR 2013), held in Rome (Italy), March 1617, 2013. The
SR workshop aims to bring together researchers, possibly with different
backgrounds, working on various aspects of strategic reasoning in computer
science, both from a theoretical and a practical point of view. This year SR
has hosted four outstanding invited talks by Krishnendu Chatterjee, Alessio R.
Lomuscio, Jean-Francois Raskin, and Michael Wooldridge. Moreover, the program
committee selected 13 papers among the 23 contributions submitted. Almost all
of them have been revised by three reviews and the contributions have been
selected according to quality and relevance to the topics of the workshop.


title:
Symmetry of Lie algebras associated with (\epsilon,\delta)
  Freudenthal-Kantor triple systems

abstract:
  Symmetry group of Lie algebras and superalgebras constructed from
(\epsilon,\delta) Freudenthal- Kantor triple systems has been studied.
Especially, for a special (\epsilon,\epsilon) Freudenthal- Kantor triple, it is
SL(2) group. Also, relationship between two constructions of Lie algebras from
structurable algebra has been investigated.


title: A Method for Comparing Hedge Funds

abstract:
  The paper presents new machine learning methods: signal composition, which
classifies time-series regardless of length, type, and quantity; and
self-labeling, a supervised-learning enhancement. The paper describes further
the implementation of the methods on a financial search engine system to
identify behavioral similarities among time-series representing monthly returns
of 11,312 hedge funds operated during approximately one decade (2000 - 2010).
The presented approach of cross-category and cross-location classification
assists the investor to identify alternative investments.


title: Eichler-Shimura isomorphism for complex hyperbolic lattices

abstract:
  We consider the cohomology group $H^1(\Gamma, \rho)$ of a discrete subgroup
$\Gamma\subset G=SU(n, 1)$ and the symmetric tensor representation $\rho$ on
$S^m(\mathbb C^{n+1})$.
  We give an elementary proof of the Eichler-Shimura isomorphism that harmonic
forms $H^1(\Gamma\backslash G/K, \rho)$ are $(0, 1)$-forms for the automorphic
holomorphic bundle induced by the representation $S^m(\mathbb C^{n})$ of $K$.


title: CO Component Estimation Based on the Independent Component Analysis

abstract:
  Fast Independent Component Analysis (FastICA) is a component separation
algorithm based on the levels of non-Gaussianity. Here we apply the FastICA to
the component separation problem of the microwave background including carbon
monoxide (CO) line emissions that are found to contaminate the PLANCK High
Frequency Instrument (HFI) data. Specifically we prepare 100GHz, 143GHz, and
217GHz mock microwave sky maps including galactic thermal dust, NANTEN CO line,
and the Cosmic Microwave Background (CMB) emissions, and then estimate the
independent components based on the kurtosis. We find that the FastICA can
successfully estimate the CO component as the first independent component in
our deflection algorithm as its distribution has the largest degree of
non-Gaussianity among the components. By subtracting the CO and the dust
components from the original sky maps, we will be able to make an unbiased
estimate of the cosmological CMB angular power spectrum.


title: Bio-Signals-based Situation Comparison Approach to Predict Pain

abstract:
  This paper describes a time-series-based classification approach to identify
similarities between bio-medical-based situations. The proposed approach allows
classifying collections of time-series representing bio-medical measurements,
i.e., situations, regardless of the type, the length and the quantity of the
time-series a situation comprised of.


title:
Entangled state engineering of vibrational modes in a multi-membrane
  optomechanical system

abstract:
  We propose a method to generate entangled states of the vibrational modes of
N membranes which are coupled to a cavity mode via the radiation pressure.
Using sideband excitations, we show that arbitrary entangled states of
vibrational modes of different membranes can be produced in principle by
sequentially applying a series of classical pulses with desired frequencies,
phases and durations. As examples, we show how to synthesize several typical
entangled states, for example, Bell states, NOON states, GHZ states and W
states. The environmental effect, information leakage, and experimental
feasibility are briefly discussed. Our proposal can also be applied to other
experimental setups of optomechanical systems, in which many mechanical
resonators are coupled to a common sing-mode cavity field via the radiation
pressure.


title:
What the complex joint probabilities observed in weak measurements can
  tell us about quantum physics

abstract:
  Quantum mechanics does not permit joint measurements of non-commuting
observables. However, it is possible to measure the weak value of a projection
operator, followed by the precise measurement of a different property. The
results can be interpreted as complex joint probabilities of the two
non-commuting measurement outcomes. Significantly, it is possible to predict
the outcome of completely different measurements by combining the joint
probabilities of the initial state with complex conditional probabilities
relating the new measurement to the possible combinations of measurement
outcomes used in the characterization of the quantum state. We can therefore
conclude that the complex conditional probabilities observed in weak
measurements describe fundamental state-independent relations between
non-commuting properties that represent the most fundamental form of universal
laws in quantum physics.


title: Enabling Gravity Physics by Inquiry using Easy Java Simulation

abstract:
  Studying physics of very large scale like the solar system is difficult in
real life, using telescope on clear skies over years. We are probably a world
first to create four well designed gravity computer models to serve as powerful
pedagogical tools for students active inquiry, based on real data. These models
are syllabus customized, free and rapidly prototyped with Open Source Physics
researchers educators. Pilot study suggests students enactment of investigative
learning like scientist is now possible, where gravity-physics comes alive. We
are still continually improving the features of these computer models through
feedback from students and teachers and the models can be downloaded from the
internet. We hope more teachers will find the simulations useful in their own
classes and further customized them so that others will find them more
intelligible and contribute back to the wider educational fraternity to benefit
all humankind.


title: A scripted control system for autonomous hardware timed experiments

abstract:
  We present the labscript suite, an open-source experiment control system for
automating shot-based experiments and their analysis. Experiments are composed
as Python code, which is used to produce low-level hardware instructions. They
are queued up and executed on the hardware in real time, synchronized by a
pseudoclock. Experiment parameters are manipulated graphically, and analysis
routines are run as new data is acquired. With this system, we can easily
automate exploration of parameter spaces, including closed-loop optimization.


title:
Addressing learning difficulties in Newtons 1st and 3rd Laws through
  problem based inquiry using Easy Java Simulation

abstract:
  We develop an Easy Java Simulation (EJS) model for students to visualize
Newtons 1st and 3rd laws, using frictionless constant motion equation and a
spring collision equation during impact. Using Physics by Inquiry instructional
(PbI) strategy, the simulation and its problem based inquiry worksheet aim to
enhance learning of these two Newtonian concepts. We report results from
Experimental (N=62 students) and Control (N=67) Groups in 11 multiple choice
questions pre and post tests, conducted by three teachers in the school.
Results suggest, at 95 percent confidence level, significant improvement for
concept of Newtons 1st Law while not so for Newtons 3rd Law. A Focus Group
Discussion revealed students confirming the usefulness of the EJS model in
visualizing the 1st Law while not so much for the 3rd Law. We speculate the
design ideas for constant velocity motion in the computer model coupled with
the PbI worksheet did allow for making sense and experiencing of the 1st Law,
where traditional pen-paper representations could not. We have improved the
features for the action-reaction contact forces visualization associated with
the 3rd Law and we hope other teachers will find the simulation useful for
their classes and further customize them to benefit all mankind, becoming
citizens for the world.


title: t-c gamma and t-cg in warped extra dimensions

abstract:
  In this work, we calculate the top quark rare decays t-cgamma and t-cg in the
framework where the standard model is embedded in a warped extra dimension with
the custodial symmetry SU(3)c*SU(2)L*SU(2)R*U(1)x*PLR. Adopting reasonable
assumptions on the parameter space,we numerically find the branching ratios of
t-cgamma exceeding 10^-6 and that of t-cg exceeding 10^-5 respectively, which
can be detected in near future.


title: On the Koszul Algebra for Trivariate Monomial Ideals

abstract:
  We will describe how we can identify the structure of the Koszul algebra for
trivariate monomial ideals from minimal free resolutions. We use recent work of
L. Avramov, where he classifies the behavior of Bass numbers of embedding
codepth 3 commutative local rings. His classification relies on a corresponding
classification of their respective Koszul algebras, which is comprised of 5
categories. Using Avramov's classification of the Koszul algebra, along with
their respective Bass series we will learn how to identify the Koszul algebra
structure by inspecting the minimal free resolution of the quotient ring. We
give a complete classification of the Koszul algebra for generic monomial
ideals and offer several examples. In addition we will describe a class of
ideals with a specific Koszul algebra structure which was previously unknown.


title:
Explicit Noether Normalization for Simultaneous Conjugation via
  Polynomial Identity Testing

abstract:
  Mulmuley recently gave an explicit version of Noether's Normalization lemma
for ring of invariants of matrices under simultaneous conjugation, under the
conjecture that there are deterministic black-box algorithms for polynomial
identity testing (PIT). He argued that this gives evidence that constructing
such algorithms for PIT is beyond current techniques. In this work, we show
this is not the case. That is, we improve Mulmuley's reduction and
correspondingly weaken the conjecture regarding PIT needed to give explicit
Noether Normalization. We then observe that the weaker conjecture has recently
been nearly settled by the authors, who gave quasipolynomial size hitting sets
for the class of read-once oblivious algebraic branching programs (ROABPs).
This gives the desired explicit Noether Normalization unconditionally, up to
quasipolynomial factors.
  As a consequence of our proof we give a deterministic parallel
polynomial-time algorithm for deciding if two matrix tuples have intersecting
orbit closures, under simultaneous conjugation.
  We also study the strength of conjectures that Mulmuley requires to obtain
similar results as ours. We prove that his conjectures are stronger, in the
sense that the computational model he needs PIT algorithms for is equivalent to
the well-known algebraic branching program (ABP) model, which is provably
stronger than the ROABP model.
  Finally, we consider the depth-3 diagonal circuit model as defined by Saxena,
as PIT algorithms for this model also have implications in Mulmuley's work.
Previous work have given quasipolynomial size hitting sets for this model. In
this work, we give a much simpler construction of such hitting sets, using
techniques of Shpilka and Volkovich.


title: Phase-Resolved Timing Analysis of GRS 1915+105 in Its {\rho} State

abstract:
  We made a phase-resolved timing analysis of GRS 1915+105 in its {\rho} state
and obtained detailed {\rho} cycle evolutions of the frequency, the amplitude
and the coherence of low-frequency quasi-periodic oscillation (LFQPO). We
combined our timing results with the spectral study by Neilsen et al. to
perform an elaborate comparison analysis. Our analyses show that the LFQPO
frequency does not scale with the inner disk radius, but it is related to the
spectral index, indicating a possible correlation between the LFQPOs and the
corona. The LFQPO amplitude spectrum and other results are naturally explained
by tying the LFQPO to the corona. The similarities of the spectra of
variability parameters between the LFQPO from {\rho} state and those from more
steady states indicate that the LFQPOs of GRS 1915+105 in very different states
seem to share the same origin.


title:
High mobility and high on/off ratio field-effect transistors based on
  chemical vapor deposited single-crystal MoS2 grains

abstract:
  We report field-effect transistors (FETs) with single-crystal molybdenum
disulfide (MoS2) channels synthesized by chemical vapor deposition (CVD). For a
bilayer MoS2 FET, the mobility is ~17 cm2V-1s-1 and the on/off current ratio is
~108, which are much higher than those of FETs based on CVD polycrystalline
MoS2 films. By avoiding the detrimental effects of the grain boundaries and the
contamination introduced by the transfer process, the quality of the CVD MoS2
atomic layers deposited directly on SiO2 is comparable to the best exfoliated
MoS2 flakes. It shows that CVD is a viable method to synthesize high quality
MoS2 atomic layers.


title: A solvable string on a Lorentzian surface

abstract:
  It is shown that there are nonlinear sigma models which are Darboux
integrable and possess a solvable Vessiot group in addition to those whose
Vessiot groups are central extensions of semi-simple Lie groups. They govern
harmonic maps between Minkowski space $\mathbb{R}^{1,1}$ and certain complete,
non-constant curvature 2-metrics. The solvability of the Vessiot group permits
a reduction of the general Cauchy problem to quadrature. We treat the specific
case of harmonic maps from Minkowski space into a non-constant curvature
Lorentzian 2-metric, $\boldsymbol{\lambda}$. Despite the completeness of
$\boldsymbol{\lambda}$ we exhibit a Cauchy problem with real analytic initial
data which blows up in finite time. We also derive a hyperbolic Weierstrass
representation formula for all harmonic maps from $\mathbb{R}^{1,1}$ into
$\boldsymbol{\lambda}$.


title:
Half-Duplex or Full-Duplex Relaying: A Capacity Analysis under
  Self-Interference

abstract:
  In this paper multi-antenna half-duplex and full-duplex relaying are compared
from the perspective of achievable rates. Full-duplexing operation requires
additional resources at the relay such as antennas and RF chains for
self-interference cancellation. Using a practical model for the residual
self-interference, full-duplex achievable rates and degrees of freedom are
computed for the cases for which the relay has the same number of antennas or
the same number of RF chains as in the half-duplex case, and compared with
their half-duplex counterparts. It is shown that power scaling at the relay is
necessary to maximize the the degrees of freedom in the full-duplex mode.


title:
Estimating Thematic Similarity of Scholarly Papers with Their Resistance
  Distance in an Electric Network Model

abstract:
  We calculate resistance distances between papers in a nearly bipartite
citation network of 492 papers and the sources cited by them. We validate that
this is a realistic measure of thematic distance if each citation link has an
electric resistance equal to the geometric mean of the number of the paper's
references and the citation number of the cited source.


title:
Density-functional theory study of gramicidin A ion channel geometry and
  electronic properties

abstract:
  Understanding the mechanisms underlying ion channel function from the
atomic-scale requires accurate ab initio modelling as well as careful
experiments. Here, we present a density functional theory (DFT) study of the
ion channel gramicidin A, whose inner pore conducts only monovalent cations and
whose conductance has been shown to depend on the side chains of the amino
acids in the channel. We investigate the ground-state geometry and electronic
properties of the channel in vacuum, focusing on their dependence on the side
chains of the amino acids. We find that the side chains affect the ground state
geometry, while the electrostatic potential of the pore is independent of the
side chains. This study is also in preparation for a full, linear scaling DFT
study of gramicidin A in a lipid bilayer with surrounding water. We demonstrate
that linear scaling DFT methods can accurately model the system with reasonable
computational cost. Linear scaling DFT allows ab initio calculations with
10,000 to 100,000 atoms and beyond, and will be an important new tool for
biomolecular simulations.


title: Cascade Product of Permutation Groups

abstract:
  Motivated by computational efficiency in algebraic automata theory here we
define the cascade product of permutation groups as an external product, as a
generic extension. It is the most general hierarchical product that uses
arbitrary total functions to combine a linearly ordered set of permutation
groups. Algebraically speaking, cascade products are explicitly constructed
substructures of the iterated wreath product. We show how direct, semidirect
and wreath products can be described as cascade products and we also discuss
examples of composite groups that can only be constructed exactly as generic
extensions by cascade products. The cascade construction naturally generalizes
to the transformation semigroup case by leaving out the details of defining
inverse operations.


title: Vogan diagrams of affine twisted Lie superalgebras

abstract:
  A Vogan diagram is a Dynkin diagram with a Cartan involution of twisted
affine superlagebras based on maximally compact Cartan subalgebras. This
article construct the Vogan diagrams of twisted affine superalgebras. It is a
part of completion of classification of vogan diagrams to superalgebras cases.


title: Multidimensional Social Network in the Social Recommender System

abstract:
  All online sharing systems gather data that reflects users' collective
behaviour and their shared activities. This data can be used to extract
different kinds of relationships, which can be grouped into layers, and which
are basic components of the multidimensional social network proposed in the
paper. The layers are created on the basis of two types of relations between
humans, i.e. direct and object-based ones which respectively correspond to
either social or semantic links between individuals. For better understanding
of the complexity of the social network structure, layers and their profiles
were identified and studied on two, spanned in time, snapshots of the Flickr
population. Additionally, for each layer, a separate strength measure was
proposed. The experiments on the Flickr photo sharing system revealed that the
relationships between users result either from semantic links between objects
they operate on or from social connections of these users. Moreover, the
density of the social network increases in time. The second part of the study
is devoted to building a social recommender system that supports the creation
of new relations between users in a multimedia sharing system. Its main goal is
to generate personalized suggestions that are continuously adapted to users'
needs depending on the personal weights assigned to each layer in the
multidimensional social network. The conducted experiments confirmed the
usefulness of the proposed model.


title:
Surface Bound States and Spontaneous Current in Cyclic d-Wave
  Superconductors

abstract:
  On the basis of Eilenberger theory, surface bound states and spontaneous
current are studied in cyclic d-wave superconductors as a broken time-reversal
symmetry of superconductivity in cubic lattice symmetry. We discuss how the
spontaneous current and the electronic states depend on the orientation of the
surface relative to the symmetry of superconductivity. The condition for
topological Fermi arcs of zero-energy surface bound states to appear is
identified in the complex pairing function of the cyclic d-wave.


title:
Label-dependent Feature Extraction in Social Networks for Node
  Classification

abstract:
  A new method of feature extraction in the social network for within-network
classification is proposed in the paper. The method provides new features
calculated by combination of both: network structure information and class
labels assigned to nodes. The influence of various features on classification
performance has also been studied. The experiments on real-world data have
shown that features created owing to the proposed method can lead to
significant improvement of classification accuracy.


title: Recent Belle results in quarkonium physics

abstract:
  We review selected recent Belle results in quarkonium physics, that include
precision measurement of the eta_b(1S) parameters, evidence for the eta_b(2S);
evidence for the psi_2(1D); observation of the psi(4040) and psi(4160)
transitions to J/psi eta with anomalously high rates; observation of the
Upsilon(5S) transitions to Upsilon(1D)pi+pi- and Upsilon(1S,2S)eta. The low
excitations of charmonium and bottomonium are in agreement with the Lattice QCD
and effective theories calculations, while high excitations show unexpected
properties.


title:
On the gonality sequence of smooth curves: normalizations of singular
  curves in a quadric surface

abstract:
  Let $C$ be a smooth curve of genus $g$. For each positive integer $r$ the
$r$-gonality $d_r(C)$ of $C$ is the minimal integer $t$ such that there is
$L\in {Pic}^t(C)$ with $h^0(C,L) =r+1$. In this paper for all $g\ge 40805$ we
construct several examples of smooth curves $C$ of genus $g$ with $d_3(C)/3<
d_4(C)/4$, i.e. for which a slope inequality fails.


title:
On special cases of Radon - Nikodym theorem for vector and operator
  valued measures

abstract:
  We present a natural and simple proof of the Radon - Nikodym theorem for
measures with values in the space of bounded linear operators on a separable
Hilbert space. This space is not separable, that is why it is essential to
assume in the theorem that the range of the measure is separable. We also
discuss distinctions between uniform and strong operator measures (Remark 3.3
to Lemma 3.2, Theorem 3.5 and its Corollary 3.6).
  Proof of this version of the Radon - Nikodym theorem either is not presented
in known literature, or given for special cases and with some inaccuracies (see
Comment at the end of the paper), or given in too general form (e. g.,
Bourbaki) and uses notations that make it hard to apply the theorem.


title:
Standing waves for coupled nonlinear Schrodinger equations with decaying
  potentials

abstract:
  We study the following singularly perturbed problem for a coupled nonlinear
Schr\"{o}dinger system: {displaymath} {cases}-\e^2\Delta u +a(x) u = \mu_1
u^3+\beta uv^2, \quad x\in \R^3, -\e^2\Delta v +b(x) v =\mu_2 v^3+\beta vu^2,
\quad x\in \R^3, u> 0, v> 0 \,\,\hbox{in $\R^3$}, u(x), v(x)\to 0 \,\,\hbox{as
$|x|\to \iy$}.{cases}{displaymath} Here, $a, b$ are nonnegative continuous
potentials, and $\mu_1,\mu_2>0$. We consider the case where the coupling
constant $\beta>0$ is relatively large. Then for sufficiently small $\e>0$, we
obtain positive solutions of this system which concentrate around local minima
of the potentials as $\e\to 0$. The novelty is that the potentials $a$ and $b$
may vanish at someplace and decay to 0 at infinity.


title:
Formulation of Electrodynamics with an External Source in the Presence
  of a Minimal Measurable Length

abstract:
  In a series of papers, Quesne and Tkachuk (J. Phys. A: Math. Gen.
\textbf{39}, 10909 (2006); Czech. J. Phys. \textbf{56}, 1269 (2006)) presented
a $D+1$-dimensional $(\beta,\beta')$-two-parameter Lorentz-covariant deformed
algebra which leads to a nonzero minimal measurable length. In this paper, the
Lagrangian formulation of electrodynamics in a 3+1-dimensional space-time
described by Quesne-Tkachuk algebra is studied in the special case
$\beta'=2\beta$ up to first order over the deformation parameter $\beta$. It is
demonstrated that at the classical level there is a similarity between
electrodynamics in the presence of a minimal measurable length (generalized
electrodynamics) and Lee-Wick electrodynamics. We obtain the free space
solutions of the inhomogeneous Maxwell's equations in the presence of a minimal
length. These solutions describe two vector particles (a massless vector
particle and a massive vector particle). We estimate two different upper bounds
on the isotropic minimal length. The first upper bound is near to the
electroweak length scale $(\ell_{electroweak}\sim 10^{-18}\, m)$, while the
second one is near to the length scale for the strong interactions
$(\ell_{strong}\sim 10^{-15}\, m)$. The relationship between the
Gaete-Spallucci nonlocal electrodynamics (J. Phys. A: Math. Theor. \textbf{45},
065401 (2012)) and electrodynamics with a minimal length is investigated.


title: Status and new results on the Zb resonances

abstract:
  Recently Belle observed two charged bottomonium-like states, Zb(10610) and
Zb(10650), that are produced in the Upsilon(5S) -> Zb pi transitions and that
decay to Upsilon(nS) pi (n=1,2,3) and h_b(mP) pi (m=1,2) channels. The masses
of these states are close to the $B\bar{B}^*$ and $B^*\bar{B}^*$ thresholds,
and their favored spin-parities are $J^P=1^+$. We review status and new results
on the Zb states, that include the observation of the $Z_b\to B^{(*)}\bar{B}^*$
decays and an evidence for the neutral member of the Zb isotriplet. All
properties of the Zb states are consistent with their molecular interpretation.


title:
Optimizing performance of the deconvolution model reduction for large
  ODE systems

abstract:
  We investigate the numerical performance of the regularized deconvolution
closure introduced recently by the authors. The purpose of the closure is to
furnish constitutive equations for Irwing-Kirkwood-Noll procedure, a well known
method for deriving continuum balance equations from the Newton's equations of
particle dynamics. A version of this procedure used in the paper relies on
spatial averaging developed by Hardy, and independently by Murdoch and Bedeaux.
The constitutive equations for the stress are given as a sum of several
operator terms acting on the mesoscale average density and velocity. Each term
is a "convolution sandwich" containing the deconvolution operator, a
composition or a product operator, and the convolution (averaging) operator.
Deconvolution is constructed using filtered regularization methods from the
theory of ill-posed problems. The purpose of regularization is to ensure
numerical stability. The particular technique used for numerical experiments is
truncated singular value decomposition (SVD). The accuracy of the constitutive
equations depends on several parameters: the choice of the averaging window
function, the value of the mesoscale resolution parameter, scale separation,
the level of truncation of singular values, and the level of spectral filtering
of the averages. We conduct numerical experiments to determine the effect of
each parameter on the accuracy and efficiency of the method. Partial error
estimates are also obtained.

categories: math-ph cond-mat.dis-nn math.CA math.MP math.NA physics.comp-ph


title:
A statistical mechanics description of environmental variability in
  metabolic networks

abstract:
  Many of the chemical reactions that take place within a living cell are
irreversible. Due to evolutionary pressures, the number of allowable reactions
within these systems are highly constrained and thus the resulting metabolic
networks display considerable asymmetry. In this paper, we explore possible
evolutionary factors pertaining to the reduced symmetry observed in these
networks, and demonstrate the important role environmental variability plays in
shaping their structural organization. Interpreting the returnability index as
an equilibrium constant for a reaction network in equilibrium with a
hypothetical reference system, enables us to quantify the extent to which a
metabolic network is in disequilibrium. Further, by introducing a new directed
centrality measure via an extension of the subgraph centrality metric to
directed networks, we are able to characterise individual metabolites by their
participation within metabolic pathways. To demonstrate these ideas, we study
116 metabolic networks of bacteria. In particular, we find that the equilibrium
constant for the metabolic networks decreases significantly in-line with
variability in bacterial habitats, supporting the view that environmental
variability promotes disequilibrium within these biochemical reaction systems.


title:
Non-perturbative evaluation of cSW for smeared link clover fermion and
  Iwasaki gauge action

abstract:
  We performed a rough estimate of the non-perturbative value of the clover
term coefficient cSW for the APE stout link Wilson fermion. We varied the
number of smearings from Nsmear=1 to 6 and adopted beta values roughly
corresponding to the lattice spacing of 0.1 fm. We used the Schroedinger
functional technique for an evaluation of cSW and found that cSW decreases
monotonically as we increase Nsmear but has a 10% order of deviation from the
tree level value for Nsmear=6.


title: Trapping massless Dirac particles in a rotating saddle

abstract:
  We study particle motion in rotating saddle-shaped potentials. It is known
that such rotating potentials can generate bounded motion for particles with a
parabolic dispersion law through the combination of potential, centrifugal and
Coriolis forces in the rotating frame. When applied to massless Dirac
particles, for example electrons in graphene, such a potential is shown to lead
to eigenstates that are spatially localized near the center of the saddle at
certain energies. Although other states also exist at these energies, they have
non-overlapping support in the oscillator basis, which tend to give the
localized states a substantial life-time also when imperfections are present.


title: One parameter regularizations of products of residue currents

abstract:
  We show that Coleff-Herrera type products of residue currents can be defined
by analytic continuation of natural functions depending on one complex
variable.


title: Lattice Boltzmann method for shape optimization of fluid distributor

abstract:
  This paper presents the shape optimization of a flat-type arborescent fluid
distributor for the purpose of process intensification. A shape optimization
algorithm based on the lattice Boltzmann method (LBM) is proposed with the
objective of decreasing the flow resistance of such distributor at the
constraint of constant fluid volume. Prototypes of the initial distributor as
well as the optimized one are designed. Fluid distribution and hydraulic
characteristics of these distributors are investigated numerically. Results
show that the pressure drop of the optimized distributor is between 15.9% and
25.1% lower than that of the initial reference while keeping a uniform flow
distribution, demonstrating the process intensification in fluid distributor,
and suggesting the interests of the proposed optimization algorithm in
engineering optimal design.


title: Separate seesaw and its applications to dark matter and baryogenesis

abstract:
  We propose a new seesaw model in an extra-dimensional setup where only
right-handed neutrinos are bulk fields. In the model, localizations of an
extra-dimensional wave function and brane Majorana mass of the right-handed
neutrinos can be different among each generation of the right-handed neutrinos.
The setup can lead to different suppression factor dependences of effective
right-handed neutrino masses and neutrino Yukawa couplings for each generation.
It is shown that the resultant mass spectra of the right-handed neutrinos and
neutrino Yukawa couplings are favored in models of neutrino dark matter with
baryogenesis.


title: Conical Defects, Black Holes and Higher Spin (Super-)Symmetry

abstract:
  We study the (super-)symmetries of classical solutions in the higher spin
(super-)gravity in AdS$_3$. We show that the symmetries of the solutions are
encoded in the holonomy around the spatial circle. When the spatial holonomies
of the solutions are trivial, they preserve maximal symmetries of the theory,
and are actually the smooth conical defects. We find all the smooth conical
defects in the $sl(N), so(2N+1),sp(2N), so(2N), g_2$, as well as in $sl(N|N-1)$
and $osp(2N+1|2N)$ Chern-Simons gravity theories. In the bosonic higher spin
cases, there are one-to-one correspondences between the smooth conical defects
and the highest weight representations of Lie group. Furthermore we investigate
the higher spin black holes in $osp(3|2)$ and $sl(3|2)$ higher spin
(super-)gravity and find that they are only partially symmetric. In general,
the black holes break all the supersymmetries, but in some cases they preserve
part of the supersymmetries.


title: Smoluchowski-Kramers Limit for a System Subject to a Mean-Field Drift

abstract:
  We establish a scaling limit for autonomous stochastic Newton equations, the
solutions are often called nonlinear stochastic oscillators, where the
nonlinear drift includes a mean field term of McKean type and the driving noise
is Gaussian. Uniform convergence in L^2 sense is achieved by applying L^2-type
estimates and the Gronwall Theorem. The approximation is also called
Smoluchowski-Kramers limit and is a particular averaging technique studied by
Papanicolaou. It reveals an approximation of diffusions with a mean-field
contribution in the drift by stochastic nonlinear oscillators with
differentiable trajectories


title:
Compositional Evolution of the Anti-phase Stripe Superstructure in
  Bi2Sr2-xLaxCuO6 (0<x<=1.1) Revealed by Transmission Electron Microscopy

abstract:
  The detailed structural properties of La-doped Bi2Sr2-xLaxCuO6 (La-Bi2201,
0<=x<=1.1) have been studied by transmission electron microscopy (TEM). The
well-known incommensurate supermodulation q1 in the Bi-based cuprates evolves
from a monoclinic superstructure in the pristine Bi2201 phase to an orthogonal
one in La-Bi2201(x=0.73) phase. The b-component of the modulation vector (q1)
for x=0.25 sample is about 0.24b* and increases slightly to 0.246b* in x=0.84
sample, while it increases significantly to 0.286b* for x=1.10 sample. We have
revealed a new anti-phase stripe superstructure in all the La-doped Bi2201
samples, giving rise to a new modulation with a vector q2. This q2 modulation
is directly evolved from the orthogonal modulation q1 through an addition of
the anti-phase structure so that its vector q2 equals to q1b/2. We also
discussed the implication of these structural studies on the electronic
structure by angle-resolved photoemission spectroscopy (ARPES) experiments in
La-Bi2201.


title:
Holographic description of the Schwinger effect in electric and magnetic
  fields

abstract:
  We consider a generalization of the holographic Schwinger effect proposed by
Semenoff and Zarembo to the case with constant electric and magnetic fields.
There are two ways to turn on magnetic fields, i) the probe D3-brane picture
and ii) the string world-sheet picture. In the former picture, magnetic fields
both perpendicular and parallel to the electric field are activated by a
Lorentz transformation and a spatial rotation. In the latter one, the classical
solutions of the string world-sheet corresponding to circular Wilson loops are
generalized to contain two additional parameters encoding the presence of
magnetic fields.


title:
An innovative way of etching MoS2: Characterization and mechanistic
  investigation

abstract:
  We report a systematic study of the etching of MoS2 crystals by using XeF2 as
a gaseous reactant. By controlling the etching process, monolayer MoS2 with
uniform morphology can be obtained. The Raman and photoluminescence spectra of
the resulting material were similar to those of exfoliated MoS2. Utilizing this
strategy, different patterns such as a Hall bar structure and a hexagonal array
can be realized. Furthermore, the etching mechanism was studied by introducing
graphene as an etching mask. We believe our technique opens an easy and
controllable way of etching MoS2, which can be used to fabricate complex
nanostructures, such as nanoribbons, quantum dots and transistor structures.
This etching process using XeF2 can also be extended to other interesting
two-dimensional crystals.


title: AGILE Mini-Calorimeter gamma-ray burst catalog

abstract:
  The Mini-Calorimeter of the AGILE satellite can observe the high-energy part
of gamma-ray bursts with good timing capability. We present the data of the 85
hard gamma-ray bursts observed by the Mini-Calorimeter since the launch (April
2007) until October 2009. We report the timing data for 84 and spectral data
for 21 bursts.


title: Bruhat strata for Shimura varieties of PEL type

abstract:
  The Bruhat stratification for Shimura varieties of PEL type is studied. In
the Siegel case this stratification is a scheme-theoretic variant of the
stratification by the a-number. We show that all Bruhat strata are smooth and
determine their dimensions. We also prove that the closure of a Bruhat stratum
is a union of Bruhat strata and describe which Bruhat strata are contained in
the closure of a given Bruhat stratum.


title: Growth rate distribution of NH_4Cl dendrite and its scaling structure

abstract:
  Scaling structure of the growth rate distribution on the interface of a
dendritic pattern is investigated. The distribution is evaluated for an ${\rm
NH_4Cl}$ quasi-two-dimensional crystal by numerically solving the Laplace
equation with the boundary condition taking account of the surface tension
effect. It is found that the distribution has multifractality and the surface
tension effect is almost ineffective in the unscreened large growth region. The
values of the minimum singular exponent and the fractal dimension are smaller
than those for the diffusion-limited aggregation pattern. The Makarov's
theorem, the information dimension equals one, and the Turkevich-Scher
conjecture between the fractal dimension and the minimum singularity exponent
hold.


title: Inter Time Series Sales Forecasting

abstract:
  Combining forecast from different models has shown to perform better than
single forecast in most time series. To improve the quality of forecast we can
go for combining forecast. We study the effect of decomposing a series into
multiple components and performing forecasts on each component separately...
The original series is decomposed into trend, seasonality and an irregular
component for each series. The statistical methods such as ARIMA, Holt-Winter
have been used to forecast these components. In this paper we focus on how the
best models of one series can be applied to similar frequency pattern series
for forecasting using association mining. The proposed method forecast values
has been compared with Holt Winter method and shown that the results are better
than Holt Winter method


title:
Probing of the Interactions Between the Hot Plasmas and Galaxies in
  Clusters from z=0.1 to 0.9

abstract:
  Based on optical and X-ray data for a sample of 34 relaxed rich clusters of
galaxies with redshifts of 0.1-0.9, we studied relative spatial distributions
of the two major baryon contents, the cluster galaxies and the hot plasmas.
Using multi-band photometric data taken with the UH88 telescope, we determined
the integrated (two dimensional) radial light profiles of member galaxies in
each cluster using two independent approaches, i.e., the background subtraction
and the color-magnitude filtering. The ICM mass profile of each cluster in our
sample, also integrated in two dimensions, was derived from a
spatially-resolved spectral analysis using XMM-Newton and Chandra data. Then,
the radially-integrated light profile of each cluster was divided by its ICM
mass profile, to obtain a profile of "galaxy light vs. ICM mass ratio". The
ratio profiles over the central 0.65 R500 regions were found to steepen from
the higher- to lower- redshift subsamples, meaning that the galaxies become
more concentrated in the ICM sphere towards lower redshifts. The evolution is
also seen in galaxy number vs. ICM mass ratio profiles. A range of systematic
uncertainties in the galaxy light measurements, as well as many
radius-/redshift- dependent biases to the galaxy vs. ICM profiles have been
assessed, but none of them is significant against the observed evolution.
Besides, the galaxy light vs. total mass ratio profiles also exhibit gradual
concentration towards lower redshift. We interpret in the context that the
galaxies, the ICM, and the dark matter components followed a similar spatial
distribution in the early phase (z>0.5), while the galaxies have fallen towards
the center relative to the others at a later phase.


title:
Detection of a 522 s Pulsation from the Transient X-ray Source Suzaku
  J0102.8--7204 (SXP 523) in the Small Magellanic Cloud

abstract:
  During a routine calibration observation of 1E0102.2-7219 in the Small
Magellanic Cloud (SMC) carried out in October 2012 for the Suzaku satellite, we
detected a transient X-ray source at (RA, Dec) = (01h02m47s, -72d04m54s) in the
equinox J2000.0 with a positional uncertainty of ~1"4. We conducted a temporal
and spectral analysis of the source and found a coherent pulse signal with a
period of 522.3 +/- 0.1 s, and a featureless spectrum described by a single
power-law model with a photon index of 1.0 +/- 0.1 and a 0.5-10 keV luminosity
of 8.8 x 10^35 erg s^-1 at an assumed distance of 60 kpc. The Suzaku source is
likely to be the counterpart of 2XMMJ010247.4-720449, which has been observed
several times, including during outburst by Swift. Based on the X-ray
characteristics in our data, as well as the transient record and optical and
near-infrared features in the literature, we conclude that this source is a
high-mass X-ray binary pulsar with a Be star companion in the SMC, which is
known to harbor an exceptionally large (80) number of such sources in
comparison to our Galaxy.


title:
Coherent control via interplay between driving field and two-body
  interaction in a double well

abstract:
  We investigate interplay between external field and interatomic interaction
and its applications to coherent control of quantum tunneling for two repulsive
bosons confined in a high-frequency driven double well. A full solution of the
system is generated analytically as a coherent non-Floquet state by using the
Floquet states as a set of complete bases. It is demonstrated that the photon
resonance of interaction leads to translation of the Floquet level-crossing
points, and the non-resonant interaction causes avoided crossing of partial
levels. In the non-Floquet states, the bosons beyond the crossing points slowly
vary their populations, and the resonant (non-resonant) interactions enhance
(decrease) the tunneling rate of the paired particles. Three different kinds of
the coherent destructions of tunneling (CDT) at the crossing, avoided-crossing
and uncrossing points, and the corresponding stationary-like states, are
illustrated. The analytical results are numerically confirmed and perfect
agreements are found. Based on the results, an useful scheme of quantum
tunneling switch between stationary-like states is presented.


title:
Coronagraphic phase diversity: performance study and laboratory
  demonstration

abstract:
  The final performance of current and future instruments dedicated to
exoplanet detection and characterization (such as SPHERE on the European Very
Large Telescope, GPI on Gemini North, or future instruments on Extremely Large
Telescopes) is limited by uncorrected quasi-static aberrations. These
aberrations create long-lived speckles in the scientific image plane, which can
easily be mistaken for planets. Common adaptive optics systems require
dedicated components to perform wave-front analysis. The ultimate wave-front
measurement performance is thus limited by the unavoidable differential
aberrations between the wavefront sensor and the scientific camera. To reach
the level of detectivity required by high-contrast imaging, these differential
aberrations must be estimated and compensated for. In this paper, we
characterize and experimentally validate a wave-front sensing method that
relies on focal-plane data. Our method, called COFFEE (for COronagraphic
Focal-plane wave-Front Estimation for Exoplanet detection), is based on a
Bayesian approach, and it consists in an extension of phase diversity to
high-contrast imaging. It estimates the differential aberrations using only two
focal-plane coronagraphic images recorded from the scientific camera itself. In
this paper, we first present a thorough characterization of COFFEE's
performance by means of numerical simulations. This characterization is then
compared with an experimental validation of COFFEE using an in-house adaptive
optics bench and an apodized Roddier & Roddier phase mask coronagraph. An
excellent match between experimental results and the theoretical study is
found. Lastly, we present a preliminary validation of COFFEE's ability to
compensate for the aberrations upstream of a coronagraph.


title:
Discussion on exp-function method and modified method of simplest
  equation

abstract:
  We discuss the relation between the modified method of simplest equation and
the exp-function method. First on the basis of our experience from the
application of the method of simplest equation we generalize the exp-function
ansatz. Then we apply the ansatz for obtaining exact solutions for members of a
class of nonlinear PDEs which contains as particular cases several nonlinear
PDEs that model the propagation of water waves.


title:
Direct measurement and modelling of internal strains in ion-implanted
  diamond

abstract:
  We present a phenomenological model and Finite Element simulations to
describe the depth variation of mass density and strain of ion-implanted
single-crystal diamond. Several experiments are employed to validate the
approach: firstly, samples implanted with 180 keV B ions at relatively low
fluences are characterized using high-resolution X-ray diffraction (HR-XRD);
secondly, the mass density variation of a sample implanted with 500 keV He ions
well above its amorphization threshold is characterized with Electron Energy
Loss Spectroscopy (EELS). At high damage densities, the experimental depth
profiles of strain and density display a saturation effect with increasing
damage and a shift of the damage density peak towards greater depth values with
respect to those predicted by TRIM simulations, which are well accounted for in
the model presented here. The model is then further validated by comparing
TEM-measured and simulated thickness values of a buried amorphous carbon layer
formed at different depths by implantation of 500 keV He ions through a
variable-thickness mask to simulate the simultaneous implantation of ions at
different energies.


title: Three new stable L5 Mars Trojans

abstract:
  Mars was second to Jupiter in being recognized as the host of a population of
Trojan minor bodies. Since 1990, five asteroids - 5261 Eureka, (101429) 1998
VF31, (121514) 1999 UJ7, 2001 DH47 and (311999) 2007 NS2 - have been identified
as Mars Trojans, one L4 and four L5. Dynamical and spectroscopic evidence
suggests that some Mars Trojans may be remnants of the original planetesimal
population that formed in the terrestrial planets region. Here we revisit the
long-term dynamical evolution of the previously known Mars Trojans and show
that 2011 SC191, 2011 SL25 and 2011 UN63 are also trailing (L5) Mars Trojans.
They appear to be as stable as Eureka and may have been Trojans over the age of
the Solar system. The fact that five Trojans move in similar orbits and one of
them is a binary may point to the disruption of a larger body early in the
history of the Solar system. Such a catastrophic event may also explain the
apparently strong asymmetry in terms of number of objects (one versus seven)
between the L4 and L5 regions. Future spectroscopic observations should be able
to reject or confirm a putative common chemical signature that may lend further
support to collisional scenario.


title: Present status of light flavoured scalar resonances

abstract:
  This talk is a brief account of recent developments on light scalar meson
spectroscopy. I mostly focus on the major revision of the $\sigma$ or
$f_0(500)$ meson in the Review of Particle Physics, driven by new data and the
accummulation of rigorous dispersive studies, but I also comment on recent
updates of other scalars and future progress.


title:
Linear PDEs and eigenvalue problems corresponding to ergodic stochastic
  optimization problems on compact manifolds

abstract:
  We consider long term average or `ergodic' optimal control poblems with a
special structure: Control is exerted in all directions and the control costs
are proportional to the square of the norm of the control field with respect to
the metric induced by the noise. The long term stochastic dynamics on the
manifold will be completely characterized by the long term density $\rho$ and
the long term current density $J$. As such, control problems may be
reformulated as variational problems over $\rho$ and $J$. We discuss several
optimization problems: the problem in which both $\rho$ and $J$ are varied
freely, the problem in which $\rho$ is fixed and the one in which $J$ is fixed.
These problems lead to different kinds of operator problems: linear PDEs in the
first two cases and a nonlinear PDE in the latter case. These results are
obtained through through variational principle using infinite dimensional
Lagrange multipliers. In the case where the initial dynamics are reversible we
obtain the result that the optimally controlled diffusion is also
symmetrizable. The particular case of constraining the dynamics to be
reversible of the optimally controlled process leads to a linear eigenvalue
problem for the square root of the density process.


title: On measurements of the canonical phase observable

abstract:
  Measurements of single-mode phase observables are studied in the spirit of
the quantum theory of measurement. We determine the minimal measurement models
of phase observables and consider methods of measuring such observables by
using a double homodyne detector. We show that, in principle, the canonical
phase distribution of the signal state can be measured via double homodyne
detection by first processing the state using a two-mode unitary channel.


title: True Multipartite Entanglement Hardy Test

abstract:
  Quantum mechanics allows systems to be entangled with each other, which
results in stronger than classical correlations. Many methods of identifying
entanglement have been proposed over years, most of which are based on
violating some statistical inequalities. In this work we extend the idea due to
Hardy, in which entanglement is not identified with use of statistical
inequalities, but by simultaneous satisfaction of certain conditions. We show
that the new variant of the Hardy paradox relying on marginal probabilities can
be resolved only by true multipartite entangled states. Also, the state
resolving this paradox for given local measurements is pure and unique in case
of qubit collections.


title:
Modeling the transport of interacting matter-waves in disorder by a
  non-linear diffusion equation

abstract:
  We model the expansion of an interacting atomic Bose-Einstein condensate in a
disordered lattice with a nonlinear diffusion equation normally used for a
variety of classical systems. We find approximate solutions of the diffusion
equation that well reproduce the experimental observations for both short and
asymptotic expansion times. Our study establishes a connection between the
peculiar shape of the expanding density profiles and the microscopic nonlinear
diffusion coefficients.


title:
Extensive v2DM study of the one-dimensional Hubbard model for large
  lattice sizes: Exploiting translational invariance and parity

abstract:
  Using variational density matrix optimization with two- and three-index
conditions we study the one-dimensional Hubbard model with periodic boundary
conditions at various filling factors. Special attention is directed to the
full exploitation of the available symmetries, more specifically the
combination of translational invariance and space-inversion parity, which
allows for the study of large lattice sizes. We compare the computational
scaling of three different semidefinite programming algorithms with increasing
lattice size, and find the boundary point method to be the most suited for this
type of problem. Several physical properties, such as the two-particle
correlation functions, are extracted to check the physical content of the
variationally determined density matrix. It is found that the three-index
conditions are needed to correctly describe the full phase diagram of the
Hubbard model. We also show that even in the case of half filling, where the
ground-state energy is close to the exact value, other properties such as the
spin-correlation function can be flawed.


title:
Effect of Dynamical Screening on Single Particle Spectral Features of
  Uniaxially Strained Graphene: Tuning the Plasmaron Ring

abstract:
  Electronic screening renormalizes the linear bands of graphene and in the
vicinity of the Dirac point, creates a diamond shaped structure in the
quasiparticle spectral density. This is a result of electron-plasmon scattering
processes which produce a finite momentum feature referred to as the `plasmaron
ring'. In this work we explore the effects of uniaxial strain on these spectral
features with the aim of understanding how strain modifies correlations. We
derive and calculate the spectral density to the G$_0$W-RPA level which allows
us to identify the dispersive behaviour of the diamond geometry, and thus
electron-plasmon scattering, for variation in electron-electron coupling
strength and magnitude of applied strain. We find that the application of
strain changes the geometry (in momentum) of the electron-plasmon scattering
and that renormalizations beyond simple geometrical scalings further enhance
this effect. These results suggest that the properties of the plasmaron ring
can be tuned through the application of uniaxial strain, effectively producing
a larger fine structure constant without the need to change the sample
substrate.


title: Spectral singularities in PT-symmetric Bose-Einstein condensates

abstract:
  We consider the model of a PT-symmetric Bose-Einstein condensate in a
delta-functions double-well potential. We demonstrate that analytic
continuation of the primarily non-analytic term |psi|^2 psi - occurring in the
underlying Gross-Pitaevskii equation - yields new branch points where three
levels coalesce. We show numerically that the new branch points exhibit the
behaviour of exceptional points of second and third order. A matrix model which
confirms the numerical findings in analytic terms is given.


title:
Introduction to Physical Implementations of Quantum Information
  Processing

abstract:
  This was a contribution to the lecture notes on the 44th IFF Spring School
held at Forschungszentrum J\"ulich in 2013 on "Quantum Information Processing".
The school as a whole had a strong focus on solid state systems. It was the
purpose of this contribution to give a brief pedagogical introduction into
quantum information processing with atoms and ions.


title: Bounds for the Second Hankel Determinant of Certain Univalent Functions

abstract:
  The estimates for the second Hankel determinant a_2a_4-a_3^2 of analytic
function f(z)=z+a_2 z^2+a_3 z^3+...b for which either zf'(z)/f(z) or
1+zf"(z)/f'(z) is subordinate to certain analytic function are investigated.
The estimates for the Hankel determinant for two other classes are also
obtained. In particular, the estimates for the Hankel determinant of strongly
starlike, parabolic starlike, lemniscate starlike functions are obtained.


title:
Schur and Fourier multipliers of an amenable group acting on
  non-commutative Lp-spaces

abstract:
  Consider a completely bounded Fourier multiplier phi of a locally compact
group G, and take 1 <= p <= infinity. One can associate to phi a Schur
multiplier on the Schatten classes S_p(L^2 G), as well as a Fourier multiplier
on Lp(LG), the non-commutative Lp-space of the group von Neumann algebra of G.
We prove that the completely bounded norm of the Schur multiplier is not
greater than the completely bounded norm of the Lp-Fourier multiplier. When G
is amenable we show that equality holds, extending a result by Neuwirth and
Ricard to non-discrete groups.
  For a discrete group G and in the special case when p > 2 is an even integer,
we show the following. If there exists a map between Lp(LG) and an ultraproduct
of Lp(M) \otimes S_p(L^2 G) that intertwines the Fourier multiplier with the
Schur multiplier, then G must be amenable. This is an obstruction to extend the
Neuwirth-Ricard result to non-amenable groups.


title: Optimal Threshold Scheduler for Cellular Networks

abstract:
  The conventional wireless schedulers of Unicast and Multicast either fulfill
multiuser diversity or broadcast gain, but not both together. To achieve
optimal system throughput we need a scheduler that exploits both the multiuser
diversity gain and the Multicasting gain simultaneously. We first propose a new
medianthreshold scheduler that selects all users having instantaneous SNR above
the median value for transmission. The system rate equation for the proposed
scheduler is also derived. We then optimize the median-threshold so that it
performs well over an entire SNR range.With the help of simulation results we
compare performance of the proposed scheduler with schedulers like Unicast,
Multicast and other Opportunistic Multicast Schedulers (OMS) which are the best
schedulers in terms of throughput and show that the proposed optimized
threshold scheme outperforms all of them.


title:
Sufficient Conditions for Starlike Functions Associated with the
  Lemniscate of Bernoulli

abstract:
  Let -1\leq B<A\leq 1. Condition on \beta, is determined so that 1+\beta
zp'(z)/p^k(z)\prec(1+Az)/(1+Bz)\;(-1<k\leq3) implies p(z)\prec \sqrt{1+z}.
Similarly, condition on \beta is determined so that 1+\beta zp'(z)/p^n(z) or
p(z)+\beta zp'(z)/p^n(z)\prec\sqrt{1+z}\;(n=0, 1, 2) implies
p(z)\prec(1+Az)/(1+Bz) or \sqrt{1+z}. In addition to that condition on \beta is
derived so that p(z)\prec(1+Az)/(1+Bz) when p(z)+\beta
zp'(z)/p(z)\prec\sqrt{1+z}. Few more problems of the similar flavor are also
considered.


title: Lattice QCD and the two-photon decay of the neutral pion

abstract:
  Two-photon decays probe the structure of mesons and represent an important
contribution to hadronic light-by-light scattering. For the neutral pion, the
decay amplitude tests the effects of the chiral anomaly; for a heavy quarkonium
state, it measures the magnitude of its wavefunction at the origin. We rederive
the expression of the decay amplitude in terms of a Euclidean correlation
function starting from the theory defined on the torus. The derivation shows
that for timelike photons the approach to the infinite-volume decay amplitude
is exponential in the periodic box size.


title: Convective overshoot mixing in stellar interior models

abstract:
  The convective overshoot mixing plays an important role in stellar structure
and evolution. However, the overshoot mixing is a long standing problem. The
uncertainty of the overshoot mixing is one of the most uncertain factors in
stellar physics. As it is well known, the convective and overshoot mixing is
determined by the radial chemical component flux. In this paper, a local model
of the radial chemical component flux is established based on the hydrodynamic
equations and some model assumptions. The model is tested in stellar models.
The main conclusions are as follows. (i) The local model shows that the
convective and overshoot mixing could be regarded as a diffusion process, and
the diffusion coefficient for different chemical element is the same. However,
if the non-local terms, i.e., the turbulent convective transport of radial
chemical component flux, are taken into account, the diffusion coefficient for
each chemical element should be in general different. (ii) The diffusion
coefficient of convective / overshoot mixing shows different behaviors in
convection zone and in overshoot region because the characteristic length scale
of the mixing is large in the convection zone and small in the overshoot
region. The overshoot mixing should be regarded as a weak mixing process. (iii)
The result of the diffusion coefficient of mixing is tested in stellar models.
It is found that a single choice of our central mixing parameter leads to
consistent results for a solar convective envelope model as well as for core
convection models of stars with mass from 2M to 10M.


title: Second-Order Non-Stationary Online Learning for Regression

abstract:
  The goal of a learner, in standard online learning, is to have the cumulative
loss not much larger compared with the best-performing function from some fixed
class. Numerous algorithms were shown to have this gap arbitrarily close to
zero, compared with the best function that is chosen off-line. Nevertheless,
many real-world applications, such as adaptive filtering, are non-stationary in
nature, and the best prediction function may drift over time. We introduce two
novel algorithms for online regression, designed to work well in non-stationary
environment. Our first algorithm performs adaptive resets to forget the
history, while the second is last-step min-max optimal in context of a drift.
We analyze both algorithms in the worst-case regret framework and show that
they maintain an average loss close to that of the best slowly changing
sequence of linear functions, as long as the cumulative drift is sublinear. In
addition, in the stationary case, when no drift occurs, our algorithms suffer
logarithmic regret, as for previous algorithms. Our bounds improve over the
existing ones, and simulations demonstrate the usefulness of these algorithms
compared with other state-of-the-art approaches.


title: Routing for Security in Networks with Adversarial Nodes

abstract:
  We consider the problem of secure unicast transmission between two nodes in a
directed graph, where an adversary eavesdrops/jams a subset of nodes. This
adversarial setting is in contrast to traditional ones where the adversary
controls a subset of links. In particular, we study, in the main, the class of
routing-only schemes (as opposed to those allowing coding inside the network).
Routing-only schemes usually have low implementation complexity, yet a
characterization of the rates achievable by such schemes was open prior to this
work. We first propose an LP based solution for secure communication against
eavesdropping, and show that it is information-theoretically rate-optimal among
all routing-only schemes. The idea behind our design is to balance information
flow in the network so that no subset of nodes observe "too much" information.
Interestingly, we show that the rates achieved by our routing-only scheme are
always at least as good as, and sometimes better, than those achieved by
"na\"ive" network coding schemes (i.e. the rate-optimal scheme designed for the
traditional scenario where the adversary controls links in a network rather
than nodes.) We also demonstrate non-trivial network coding schemes that
achieve rates at least as high as (and again sometimes better than) those
achieved by our routing schemes, but leave open the question of characterizing
the optimal rate-region of the problem under all possible coding schemes. We
then extend these routing-only schemes to the adversarial node-jamming
scenarios and show similar results. During the journey of our investigation, we
also develop a new technique that has the potential to derive non-trivial
bounds for general secure-communication schemes.


title: Quantum-Secure Authentication with a Classical Key

abstract:
  Authentication provides the trust people need to engage in transactions. The
advent of physical keys that are impossible to copy promises to revolutionize
this field. Up to now, such keys have been verified by classical
challenge-response protocols. Such protocols are in general susceptible to
emulation attacks. Here we demonstrate Quantum-Secure Authentication ("QSA") of
an unclonable classical physical key in a way that is inherently secure by
virtue of quantum-physical principles. Our quantum-secure authentication
operates in the limit of a large number of channels, represented by the more
than thousand degrees of freedom of an optical wavefront shaped with a spatial
light modulator. This allows us to reach quantum security with weak coherent
pulses of light containing dozens of photons, too few for an adversary to
determine their complex spatial shapes, thereby rigorously preventing
emulation.


title:
Neutrino and Dark Radiation properties in light of latest CMB
  observations

abstract:
  Recent Cosmic Microwave Background measurements at high multipoles from the
South Pole Telescope and from the Atacama Cosmology Telescope seem to disagree
in their conclusions for the neutrino and dark radiation properties. In this
paper we set new bounds on the dark radiation and neutrino properties in
different cosmological scenarios combining the ACT and SPT data with the nine
year data release of the Wilkinson Microwave Anisotropy Probe (WMAP9), Baryon
Acoustic Oscillation data, Hubble Telescope measurements of the Hubble
constant, and Supernovae Ia luminosity distance data. In the standard three
massive neutrino case, the two high multipole probes give similar results if
Baryon Acoustic Oscillation data are removed from the analyses and Hubble
Telescope measurements are also exploited. A similar result is obtained within
a standard cosmology with Neff massless neutrinos, although in this case the
agreement between these two measurements is also improved when considering
simultaneously Baryon Acoustic Oscillation data and Hubble Space Telescope
measurements. In the Neff massive neutrino case the two high multipole probes
give very different results regardless of the external data sets used in the
combined analyses. In the case in which a dark radiation background with
unknown clustering properties is also considered, SPT data seem to exclude the
standard value for the dark radiation viscosity cvis=1/3 at the 2 sigma CL,
finding evidence for massive neutrinos only when combining SPT data with BAO
measurements.


title:
Theory of helicity-sensitive terahertz radiation detection by field
  effect transistors

abstract:
  Within the two antenna model, we develop a theory of the recently observed
helicity-sensitive detection of terahertz radiation by FETs. The effect arises
because of the mixing of the ac signals produced in the channel by the two
antennas. We calculate the helicity-dependent part of the photoresponse and its
dependence on the antenna impedance, gate length, and gate voltage.


title: Carnot process with a single particle

abstract:
  We determine the statistics of work in isothermal volume changes of a
classical ideal gas consisting of a single particle. Combining our results with
the findings of Lua and Grosberg [J. Chem. Phys. B 109, 6805 (2005)] on
adiabatic expansions and compressions we then analyze the joint probability
distribution of heat and work for a microscopic, non-equilibrium Carnot cycle
and determine its efficiency at maximum power.


title:
Effect of resonant magnetic perturbations on ELMs in connected double
  null plasmas in MAST

abstract:
  The application of resonant magnetic perturbations (RMPs) with a toroidal
mode number of n=3 to connected double null plasmas in the MAST tokamak
produces up to a factor of 9 increase in Edge Localized Mode (ELM) frequency
and reduction in plasma energy loss associated with type-I ELMs. A threshold
current for ELM mitigation is observed above which the ELM frequency increases
approximately linearly with current in the coils. The effect of the RMPs is
found to be scenario dependent. In one scenario the mitigation is only due to a
large density pump out event and if the density is recovered by gas puffing a
return to type I ELMs is observed. In another scenario sustained ELM mitigation
can be achieved irrespective of the amount of fuelling. Despite a large scan of
parameters complete ELM suppression has not been achieved. The results have
been compared to modelling performed using either the vacuum approximation or
including the plasma response. The requirement for a resonant condition, that
is an optimum alignment of the perturbation with the plasma, has been confirmed
by performing a scan in the pitch angle of the applied field.


title: Structure and magnetism of disordered carbon

abstract:
  Motivated by the observation of ferromagnetism in carbon foams, a massive
search for (meta)stable disorder structures of elemental carbon is performed by
a generate and test approach. We use the Density Functional based program
SIESTA to optimize the structures and calculate the electronic spectra and spin
densities. About 1% of the 24000 optimized structures presents magnetic
moments, a necessary but not sufficient condition for intrinsic magnetic order.
We analyze the results using elements of graph theory. Although the relation
between structure and the occurrence of magnetic moments is not yet fully
clarified, we give some minimal requirements for this possibility, such as the
existence of three-fold coordinated atoms surrounded by four-fold coordinated
atoms. We discuss in detail the most promising structures.


title: High-Frequency Tail Index Estimation by Nearly Tight Frames

abstract:
  This work develops the asymptotic properties (weak consistency and
Gaussianity), in the high-frequency limit, of approximate maximum likelihood
estimators for the spectral parameters of Gaussian and isotropic spherical
random fields. The procedure we used exploits the so-called mexican needlet
construction by Geller and Mayeli in [Geller, Mayeli (2009)]. Furthermore, we
propose a plug-in procedure to optimize the precision of the estimators in
terms of asymptotic variance.


title: Asymptotics for the Radon transform on hyperbolic spaces

abstract:
  Let G/H be a hyperbolic space over R C or H, and let K be a maximal compact
subgroup of G. Let D denote a certain explicit invariant differential operator,
such that the non-cuspidal discrete series belong to the kernel of D. For any
L^2-Schwartz function f on G/H, we prove that the Abel transform A(Df) of Df is
a Schwartz function. This is an extension of a result established in [2] for
K-finite and K\cap H-invariant functions.


title:
Existence and uniqueness of positive solutions of boundary-value
  problems for fractional differential equations with p-Laplacian operator

abstract:
  In this article, we consider the boundary-value problem of nonlinear
fractional differential equation with p-Laplacian operator. By the properties
of Green function and Schauder fixed point theorem, several existence and
nonexistence results for positive solutions, in terms of two parameters are
obtained. The uniqueness of positive solution on these parameters is also
studied.


title:
Generation of Electrostatic Waves via Parametric Instability and Heating
  of Solar Corona

abstract:
  In the upper layers of the solar atmosphere the temperature increases
sharply. We studied possibility of the transfer of neutrals motion energy into
the electrostatic waves.Electrostatic waves could damp in the upper layers of
the solar atmosphere and their energy could be transformed into the thermal
energy of the solar atmosphere plasma. When studying the plasma dynamics in the
low altitudes of the solar atmosphere, we investigated hydrodynamics of the
plasma which consists of thee components-electrons, ions and neutrals. In order
to study evolution of disturbances of high amplitudes the parametric resonance
technique is used. The dispersion relation for the electrostatic waves excited
due tot he motion of neutrals is derived. The frequencies of electromagnetic
waves which could be excited due to existence of the acoustic wave are found.
The increment of excited electrostatic waves are determined. The motion of the
neutrals in the lower solar atmosphere, where ionization rate is low, could
excite electrostatic waves. In the upper solar atmosphere the ionization rate
increases and motion of the neutrals could not support electrostatic waves and
these waves could damp due to the collision of the charged particles. The
energy of the damping waves could be transformed into the thermal energy of the
plasma in the upper atmosphere.


title: Designing Unimodular Codes via Quadratic Optimization is not Always Hard

abstract:
  The NP-hard problem of optimizing a quadratic form over the unimodular vector
set arises in radar code design scenarios as well as other active sensing and
communication applications. To tackle this problem (which we call unimodular
quadratic programming (UQP)), several computational approaches are devised and
studied. A specialized local optimization scheme for UQP is introduced and
shown to yield superior results compared to general local optimization methods.
Furthermore, a \textbf{m}onotonically \textbf{er}ror-bound \textbf{i}mproving
\textbf{t}echnique (MERIT) is proposed to obtain the global optimum or a local
optimum of UQP with good sub-optimality guarantees. The provided sub-optimality
guarantees are case-dependent and generally outperform the $\pi/4$
approximation guarantee of semi-definite relaxation. Several numerical examples
are presented to illustrate the performance of the proposed method. The
examples show that for cases including several matrix structures used in radar
code design, MERIT can solve UQP efficiently in the sense of sub-optimality
guarantee and computational time.


title: Traces in monoidal derivators, and homotopy colimits

abstract:
  A variant of the trace in a monoidal category is given in the setting of
closed monoidal derivators, which is applicable to endomorphisms of fiberwise
dualizable objects. Functoriality of this trace is established. As an
application, an explicit formula for the trace of the homotopy colimit of
endomorphisms over finite EI-categories is deduced. This result can be seen as
a generalization of the additivity of traces in monoidal categories with a
compatible triangulation.


title:
Robust Estimation of Optical Phase Varying as a Continuous Resonant
  Process

abstract:
  It is well-known that adaptive homodyne estimation of continuously varying
optical phase provides superior accuracy in the phase estimate as compared to
adaptive or non-adaptive static estimation. However, most phase estimation
schemes rely on precise knowledge of the underlying parameters of the system
under measurement, and performance deteriorates significantly with changes in
these parameters; hence it is desired to develop robust estimation techniques
immune to such uncertainties. In related works, we have already shown how
adaptive homodyne estimation can be made robust to uncertainty in an underlying
parameter of the phase varying as a simplistic Ornstein-Uhlenbeck stochastic
noise process. Here, we demonstrate robust phase estimation for a more
complicated resonant noise process using a guaranteed cost robust filter.


title: N-person quantum Russian roulette

abstract:
  We generalize the concept of quantum Russian roulette introduced in [A.G.M.
Schmidt, L. da Silva, Physica A 392 (2013) 400-410]. Our model coincides with
the previous one in the case of the game with two players and gives the
suitable quantum description for any finite number of players.


title:
Exploiting the Accumulated Evidence for Gene Selection in Microarray
  Gene Expression Data

abstract:
  Machine Learning methods have of late made significant efforts to solving
multidisciplinary problems in the field of cancer classification using
microarray gene expression data. Feature subset selection methods can play an
important role in the modeling process, since these tasks are characterized by
a large number of features and a few observations, making the modeling a
non-trivial undertaking. In this particular scenario, it is extremely important
to select genes by taking into account the possible interactions with other
gene subsets. This paper shows that, by accumulating the evidence in favour (or
against) each gene along the search process, the obtained gene subsets may
constitute better solutions, either in terms of predictive accuracy or gene
size, or in both. The proposed technique is extremely simple and applicable at
a negligible overhead in cost.


title: Scalable Cost-Aware Multi-Way Influence Maximization

abstract:
  Viral marketing is different from other marketing strategies since it
leverages the influence power in intimate relationship, e.g., close friends,
family members, couples. Due to the development and popularity of social
networking services, such as Facebook, Twitter, and Pinterest, the new notion
of "social media marketing" has appeared in recent years and presents new
opportunities for enabling large-scale and prevalent viral marketing online. To
boost the growth of their sales, business is embracing social media in a big
way. According to USA Today, the sales of software to run corporate social
networks will grow 61\% a year and be a $6.4$ billion business by 2016.


title:
Electrically tunable three-dimensional g-factor anisotropy in single
  InAs self-assembled quantum dots

abstract:
  Three-dimensional anisotropy of the Lande g-factor and its electrical
modulation are studied for single uncapped InAs self-assembled quantum dots
(QDs). The g-factor is evaluated from measurement of inelastic cotunneling via
Zeeman substates in the QD for various magnetic field directions. We find that
the value and anisotropy of the g-factor depends on the type of orbital state
which arises from the three-dimensional confinement anisotropy of the QD
potential. Furthermore, the g-factor and its anisotropy are electrically tuned
by a side-gate which modulates the confining potential.


title:
Smoothing effect of Compound Poisson approximation to distribution of
  weighted sums

abstract:
  The accuracy of compound Poisson approximation to the sum
$S=w_1S_1+w_2S_2+...+w_NS_N$ is estimated.
  Here $S_i$ are sums of independent or weakly dependent random variables, and
$w_i$ denote weights. The overall smoothing effect of $S$ on $w_iS_i$ is
estimated by L\' evy concentration function.


title:
Average value of solutions for the bipartite boolean quadratic programs
  and rounding algorithms

abstract:
  We consider domination analysis of approximation algorithms for the bipartite
boolean quadratic programming problem (BBQP) with m+n variables. A closed form
formula is developed to compute the average objective function value A of all
solutions in O(mn) time. However, computing the median objective function value
of the solutions is shown to be NP-hard. Also, we show that any solution with
objective function value no worse than A dominates at least 2^{m+n-2} solutions
and this bound is the best possible. Further, we show that such a solution can
be identified in O(mn) time and hence the dominance ratio of this algorithm is
at least 1/4. We then show that for any fixed rational number a > 1, no
polynomial time approximation algorithm exists for BBQP with dominance ratio
larger than 1-2^{(m+n)(1-a)/a}, unless P=NP. We then analyze some powerful
local search algorithms and show that they can get trapped at a local maximum
with objective function value less than A. One of our approximation algorithms
has an interesting rounding property which provides a data dependent lower
bound on the optimal objective function value. A new integer programming
formulation of BBQP is also given and computational results with our rounding
algorithms are reported.


title:
Gamma-ray observations of Cygnus X-1 above 100 MeV in the hard and soft
  states

abstract:
  We present the results of multi-year gamma-ray observations by the AGILE
satellite of the black hole binary system Cygnus X-1. In a previous
investigation we focused on gamma-ray observations of Cygnus X-1 in the hard
state during the period mid-2007/2009. Here we present the results of the
gamma-ray monitoring of Cygnus X-1 during the period 2010/mid-2012 carried out
for which includes a remarkably prolonged `soft state' phase (June 2010 -- May
2011). Previous 1--10 MeV observations of Cyg X-1 in this state hinted at a
possible existence of a non-thermal particle component with substantial
modifications of the Comptonized emission from the inner accretion disk. Our
AGILE data, averaged over the mid-2010/mid-2011 soft state of Cygnus X-1,
provide a significant upper limit for gamma-ray emission above 100 MeV of
F_soft < 20 x 10^{-8} ph/cm^2/s, excluding the existence of prominent
non-thermal emission above 100 MeV during the soft state of Cygnus X-1. We
discuss theoretical implications of our findings in the context of high-energy
emission models of black hole accretion. We also discuss possible gamma-ray
flares detected by AGILE. In addition to a previously reported episode observed
by AGILE in October 2009 during the hard state, we report a weak but important
candidate for enhanced emission which occurred at the end of June 2010
(2010-06-30 10:00 - 2010-07-02 10:00 UT) exactly in coincidence with a
hard-to-soft state transition and before an anomalous radio flare. An appendix
summarizes all previous high-energy observations and possible detections of
Cygnus X-1 above 1 MeV.


title:
Non-perturbative effect of rotation on dipolar mixed modes in red giant
  stars

abstract:
  The space missions CoRoT and Kepler provide high quality data that allow us
to test the transport of angular momentum in stars by the seismic determination
of the internal rotation profile. Our aim is to test the validity of the
seismic diagnostics for red giants rotation that are based on a perturbative
method and to investigate the oscillation spectra when the validity does not
hold. We use a non-perturbative approach implemented in the ACOR code (Ouazzani
et al. 2012) that accounts for the effect of rotation on pulsations, and solves
the pulsation eigenproblem directly for dipolar oscillation modes. We find that
the limit of the perturbation to first order can be expressed in terms of the
rotational splitting compared to the frequency separation between consecutive
dipolar modes. Above this limit, non-perturbative computations are necessary
but only one term in the spectral expansion of modes is sufficient as long as
the core rotation rate remains significantly smaller than the pulsation
frequencies. Each family of modes with different azimuthal symmetry, m, has to
be considered separately. In particular, in case of rapid core rotation, the
density of the spectrum differs significantly from one m-family of modes to
another, so that the differences between the period spacings associated with
each m-family can constitute a promising guideline toward a proper seismic
diagnostic for rotation.


title:
Existence of 3D strong solutions for a system modeling a deformable
  solid inside a viscous incompressible fluid

abstract:
  In this paper we study a coupled system modeling the movement of a deformable
solid immersed in a fluid. For the solid we consider a given deformation that
has to obey several physical constraints. The motion of the fluid is modeled by
the incompressible Navier-Stokes equations in a time-dependent bounded domain
of $\R^3$, and the solid satisfies the Newton's laws. Our contribution consists
in adapting and completing some results of ARMA 2008 in dimension 3, in a
framework where the regularity of the deformation of the solid is limited. We
rewrite the main system in domains which do not depend on time, by using a new
means of defining a change of variables, and a suitable change of unknowns. We
study the corresponding linearized system before setting a local-in-time
existence result. Global existence is obtained for small data, and in
particular for deformations of the solid which are arbitrarily close to the
identity.


title: A Riemann-Hurwitz Formula for Skeleta in Non-Archimedean Geometry

abstract:
  Let $\phi : C' \to C$ be a finite morphism between smooth, projective,
irreducible curves defined over a non-archimedean valued, algebraically closed
field $k$. This morphism induces a morphism between the analytifications of the
curves. We will construct a compatible pair of deformation retractions of
$C'^{an}$ and $C^{an}$ whose images $\Upsilon_{C'^{an}}$ and
$\Upsilon_{C^{an}}$ are closed subspaces of $C'^{an}$ and $C^{an}$ which are
homeomorphic to finite metric graphs. We refer to such closed subspaces as
skeleta. In addition, the subspaces $C'^{an}$ and $C^{an}$ are such that their
complements in the two analytifications decompose into the disjoint union of
Berkovich open balls and annuli. To these skeleta we can associate a genus. The
pair of compatible deformation retractions forces the morphism $\phi^{an}$ to
restrict to a map $\Upsilon_{C'^{an}} \to \Upsilon_{C^{an}}$. We will study how
the genus of $\Upsilon_{C'^{an}}$ can be calculated using the morphism
$\phi^{an}: \Upsilon_{C'^{an}} \to \Upsilon_{C^{an}}$.


title: Towards finite field theory: the Taylor-Lagrange regularization scheme

abstract:
  We recall a natural framework to deal with local field theory in which bare
amplitudes are completely finite. We first present the main general properties
of this scheme, the so-called Taylor-Lagrange regularization scheme. We then
investigate the consequences of this scheme on the calculation of perturbative
radiative corrections to the Higgs mass within the Standard Model. Important
consequences for the renormalization group equations are finally discussed.