title: Throughput Maximization in Wireless Powered Communication Networks

abstract:
  This paper studies the newly emerging wireless powered communication network
(WPCN) in which one hybrid access point (H-AP) with constant power supply
coordinates the wireless energy/information transmissions to/from distributed
users that do not have energy sources. A "harvest-then-transmit" protocol is
proposed where all users first harvest the wireless energy broadcast by the
H-AP in the downlink (DL) and then send their independent information to the
H-AP in the uplink (UL) by time-division-multiple-access (TDMA). First, we
study the sum-throughput maximization of all users by jointly optimizing the
time allocation for the DL wireless power transfer versus the users' UL
information transmissions given a total time constraint based on the users' DL
and UL channels as well as their average harvested energy values. By applying
convex optimization techniques, we obtain the closed-form expressions for the
optimal time allocations to maximize the sum-throughput. Our solution reveals
"doubly near-far" phenomenon due to both the DL and UL distance-dependent
signal attenuation, where a far user from the H-AP, which receives less
wireless energy than a nearer user in the DL, has to transmit with more power
in the UL for reliable information transmission. Consequently, the maximum
sum-throughput is achieved by allocating substantially more time to the near
users than the far users, thus resulting in unfair rate allocation among
different users. To overcome this problem, we furthermore propose a new
performance metric so-called common-throughput with the additional constraint
that all users should be allocated with an equal rate regardless of their
distances to the H-AP. We present an efficient algorithm to solve the
common-throughput maximization problem. Simulation results demonstrate the
effectiveness of the common-throughput approach for solving the new doubly
near-far problem in WPCNs.


title: A Penrose inequality for asymptotically locally hyperbolic graphs

abstract:
  We use the inverse mean curvature flow to prove a sharp
Alexandrov-Fenchel-type inequality for a class of hypersurfaces in certain
locally hyperbolic manifolds. As an application we derive an optimal Penrose
inequality for asymptotically locally hyperbolic graphs in any dimension $n\geq
3$. When the horizon has the topology of a compact surface of genus at least
one, this provides an affirmative answer, for this class of initial data sets,
to a question posed by Gibbons, Chru\'sciel and Simon on the validity of a
Penrose-type inequality for black hole solutions carrying a higher genus
horizon.


title: Revisiting lepton flavor violation in supersymmetric type II seesaw

abstract:
  In view of the recent measurement of reactor mixing angle $\theta_{13}$ and
updated limit on $BR(\mu \to e \gamma)$ by the MEG experiment, we re-examine
the charged lepton flavor violations in a framework of supersymmetric type II
seesaw mechanism. Supersymmetric type II seesaw predicts strong correlation
between $BR(\mu \to e \gamma)$ and $BR(\tau \to \mu \gamma)$ mainly in terms of
the neutrino mixing angles. We show that such a correlation can be determined
accurately after the measurement of $\theta_{13}$. We compute different factors
which can affect this correlation and show that the mSUGRA-like scenarios, in
which slepton masses are taken to be universal at the high scale, predicts $3.5
\lesssim BR(\tau \to \mu \gamma)/BR(\mu \to e \gamma) \lesssim 30$ for normal
hierarchical neutrino masses. Any experimental indication of deviation from
this prediction would rule out the minimal models of supersymmetric type II
seesaw. We show that the current MEG limit puts severe constraints on the light
sparticle spectrum in mSUGRA model if the seesaw scale lies within
$10^{13}$-$10^{15}$ GeV. It is shown that these constraints can be relaxed and
relatively light sparticle spectrum can be obtained in a class of models in
which the soft mass of triplet scalar is taken to be non-universal at the high
scale.


title: Priority Based Pre-emptive Task Scheduling for Android Operating System

abstract:
  Android mobile operating system which is based on Linux Kernel 2.6, has open
source license and adaptability to user driven applications. As all other
operating systems it has all the basic features like process scheduling, memory
management, process management etc associated with it. Any mobile platform
works smoothly when the process scheduling is performed in a proper way. Ideal
platform is that in which no resource conflict occurs. Thus scheduling in every
manner is essential for the operating system to adapt itself with the
requirement of a particular application. In this paper, priority based
pre-emptive task scheduling is proposed for the SMS application. The idea is to
define High priority to required contacts, for ex. Contact numbers of parents
or teachers will be given High priority. If in case, any SMS from these High
priority contacts is received, the application would flash the SMS on the
active screen and redirect this High priority SMS to the Priority Inbox.


title: A note on solutions of linear systems

abstract:
  In this paper we will consider Rohde's general form of {1}-inverse of a
matrix A. The necessary and sufficient condition for consistency of a linear
system Ax=c will be represented. We will also be concerned with the minimal
number of free parameters in Penrose's formula x = A^(1) c + (I - A^(1)A)y for
obtaining the general solution of the linear system. This results will be
applied for finding the general solution of various homogenous and
non-homogenous linear systems as well as for different types of matrix
equations.


title: Compact K\"ahler 3-manifolds without non-trivial subvarieties

abstract:
  We prove that any compact K\"ahler 3-dimensional manifold which has no
non-trivial complex subvarieties is a torus. This is a very special case of a
general conjecture on the structure of 'simple manifolds', central in the
bimeromorphic classification of compact K\"ahler manifolds. The proof follows
from the Brunella pseudo-effectivity theorem, combined with fundamental results
of Siu and of the second author on the Lelong numbers of closed positive
(1,1)-currents, and with a version of the hard Lefschetz theorem for
pseudo-effective line bundles, due to Takegoshi and
Demailly-Peternell-Schneider. In a similar vein, we show that a normal compact
and K\"ahler 3-dimensional analytic space with terminal singularities and nef
canonical bundle is a cyclic quotient of a simple non-projective torus if it
carries no effective divisor. This is a crucial step to complete the
bimeromorphic classification of compact K\"ahler 3-folds


title: Metric Regularity of the Sum of Multifunctions and Applications

abstract:
  In this work, we use the theory of error bounds to study metric regularity of
the sum of two multifunctions, as well as some important properties of
variational systems. We use an approach based on the metric regularity of
epigraphical multifunctions. Our results subsume some recent results by Durea
and Strugariu.


title: Photometric studies of open star clusters Haffner 11 and Czernik 31

abstract:
  We present the broad band UBVI CCD photometric investigations in the region
of the two open clusters Haffner 11 and Czernik 31. The radii of the clusters
are determined as 3.5 arcmin and 3.0 arcmin for Haffner 11 and Czernik 31
respectively. Using two colour (U-B) versus (B-V) diagram we determine the
reddening E(B-V) = 0.50+/-0.05 mag and 0.48+/-0.05 mag for the cluster Haffner
11 and Czernik 31 respectively. Using 2MASS JHKs and optical data, we
determined E(J-K) = 0.27+/-0.06 mag and E(V-K) = 1.37+/-0.06 for Haffner 11 and
E(J-K) = 0.26+/-0.08 mag and E(V-K) = 1.32+/-0.08 mag for Czernik 31. Our
analysis indicate normal interstellar extinction law in the direction of both
the clusters. Distance of the clusters is determined as 5.8+/-0.5 Kpc for
Haffner 11 and 3.2+/-0.3 Kpc for Czernik 31 by comparing the ZAMS with the CM
diagram of the clusters. The age of the cluster has been estimated as 800+/-100
Myr for Haffner 11 and 160+/-40 Myr for Czernik 31 using the stellar isochrones
of metallicity Z = 0.019.


title: Faithful representations of Lie algebras and Homogeneous Spaces

abstract:
  The faithful representations of real Lie algebras g with dimensions $n\leq 4$
acting on the dual space of the universal covering algebra of an ideal s of g,
are calculated. With the help of left and right translations of the Lie group,
we define the homogeneous manifolds of dimension n and we calculate the Killing
fields (generators of left translations), the invariant fields (generators of
right translations) and the left invariant 1-forms.


title: Generalized Bombieri - Lagarias' theorem and generalized Li's criterion

abstract:
  We show that Li's criterion equivalent to the Riemann hypothesis, viz. the
statement that the sums k_n=Sum_rho(1-(1-1/rho)^n) over Riemann xi-function
zeroes as well as all derivatives lambda_n=
(n-1)!^(-1)*d^n/dz^n(z^(n-1)*ln(xi(z))_(z=1)), where n=1, 2, 3..., should be
non-negative if and only if the Riemann hypothesis holds true, can be
generalized and the non-negativity of certain derivatives of the Riemann
xi-function estimated at an arbitrary real point a, except a=1/2, can be used
as a criterion equivalent to the Riemann hypothesis. Namely, we demonstrate
that the sums k_n=Sum_rho(1-(1-((rho-a)/(rho+a-1))^n) for any real a not equal
to 1/2 as well as the derivatives
(n-1)!^(-1)*d^n/dz^n((z-a)^(n-1)*ln(xi(z))_(z=(1-a))), n=1, 2, 3... for any
a<1/2 are non-negative if and only if the Riemann hypothesis holds true
(correspondingly, the same derivatives when a>1/2 should be non-positive for
this). Similarly to Li's one, the theorem of Bombieri and Lagarias applied to
certain multisets of complex numbers, is also generalized along the same
lines.The results presented here are now available as a paper in Ukrainian
Math. J., 64, 371-383, 2014.


title: Surface waves in deformed Bell materials

abstract:
  Small amplitude inhomogeneous plane waves are studied as they propagate on
the free surface of a predeformed semi-infinite body made of Bell constrained
material. The predeformation corresponds to a finite static pure homogeneous
strain. The surface wave propagates in a principal direction of strain and is
attenuated in another principal direction, orthogonal to the free surface. For
these waves, the secular equation giving the speed of propagation is
established by the method of first integrals. This equation is not the same as
the secular equation for incompressible half-spaces, even though the Bell
constraint and the incompressibility constraint coincide in the isotropic
infinitesimal limit.


title:
Rayleigh waves in symmetry planes of crystals: explicit secular
  equations and some explicit wave speeds

abstract:
  Rayleigh waves are considered for crystals possessing at least one plane of
symmetry. The secular equation is established explicitly for surface waves
propagating in any direction of the plane of symmetry, using two different
methods. This equation is a quartic for the squared wave speed in general, and
a biquadratic for certain directions in certain crystals, where it may itself
be solved explicitly. Examples of such materials and directions are found in
the case of monoclinic crystals with the plane of symmetry at $x_3=0$. The
cases of orthorhombic materials and of incompressible materials are also
treated.


title:
The $L^p$ boundedness of the Bergman projection for a class of bounded
  Hartogs domains

abstract:
  We generalize the Hartogs triangle to a class of bounded Hartogs domains, and
we prove that the corresponding Bergman projections are bounded on $L^p$ if and
only if $p$ is in the range $(\frac{2n}{n+1},\frac{2n}{n-1})$.


title: An analytical treatment of the neutrino masses and mixings

abstract:
  We obtain analytical formulas which connect the neutrino masses and the
leptonic mixing matrix with the entries in the mass matrix for the
approximation in which the charged lepton mixing matrix is the unit matrix. We
also extract the CP violation phase and determine the conditions in which this
is present.


title:
Superconductivity induced by hydrogen anion substitution in 1111-type
  iron arsenides

abstract:
  Hydrogen is the simplest bipolar element and its valence state can be
controlled from +1 to -1. We synthesized the 1111-type CaFeAsH and LnFeAsO1-xHx
(Ln = lanthanide) with the ZrCuSiAs type structure by a high-pressure synthesis
method. The position and valence state of the substituted H were determined by
neutron diffraction and density functional theory calculations. The close
similarity in the structural and electrical properties of CaFeAsH and CaFeAsF
indicated the formation of the hydride ion (H-), which is isovalent with the
fluoride ion (F-), in the 1111-type iron arsenides. When some of the O2- ions
in LnFeAsO are replaced by H-, superconductivity is induced by electron doping
to the FeAs-layer to maintain charge neutrality. Since the substitution limit
of hydrogen in LnFeAsO (x~0.5) is much higher than that of fluorine (x~0.2),
the hydrogen substitution technique provides an effective pathway for
high-density electron-doping, making it possible to draw the complete
electronic phase diagram of LnFeAsO. The x-T diagrams of LnFeAsO1-xHx (Ln = La,
Ce, Sm, Gd) have a wide superconducting (SC) region spanning the range x = 0.04
to 0.4, which is far from the parent antiferromagnetic region near x = 0.0. For
Ln=La, another SC dome region was found in the range x = ~ 0.2 to ~0.5 with a
maximum Tc = 36 K, in addition to a conventional SC dome located at x ~0.08
with maximum Tc = 29 K. Density functional theory calculations performed for
LaFeAsO1-xHx indicated that the newly observed Tc is correlated with the
appearance of degeneration of the Fe 3d bands (dxy, dyz and dzx), which is
caused not only by regularization of the tetrahedral shape of FeAs4 due to
chemical pressure effects but also by selective band occupation with doped
electrons. In this article, we review the recent progress of superconductivity
in iron (oxy)arsenides and related compounds induced by hydrogen substitution.


title:
Voltage-controlled spin injection with an endohedral fullerene
  CoC$_{60}$ dimer

abstract:
  Spin-dependent transport through an endohedral fullerene Co@C$_{60}$ dimer
with gold electrodes is explored theoretically using density functional and
extended H\"{u}ckel theory. Density of states spin polarizations up to 95%, due
to spin-splitting of Co 3d orbitals, are found by varying the gate and/or bias
voltage. The current-voltage characteristics and strong (up to 100%) spin
polarization of the current indicate that the device can be utilized for highly
efficient spin injection into nonmagnetic conductors. This finding opens the
way to the realization of electrostatically tuned spintronic nano devices less
than 2 nanometers in size, without ferromagnetic electrodes.


title: Some new characterizations of $PST$-groups

abstract:
  Let $H$ and $B$ be subgroups of a finite group $G$ such that $G=N_{G}(H)B$.
Then we say that $H$ is \emph{quasipermutable} (respectively
\emph{$S$-quasipermutable}) in $G$ provided $H$ permutes with $B$ and with
every subgroup (respectively with every Sylow subgroup) $A$ of $B$ such that
$(|H|, |A|)=1$. In this paper we analyze the influence of $S$-quasipermutable
and quasipermutable subgroups on the structure of $G$. As an application, we
give new characterizations of soluble $PST$-groups.


title:
Regulation of Interfacial Chemistry by Coupled Reaction-Diffusion
  Processes in the Electrolyte: A Stiff Solution Dynamics Model for Corrosion
  and Passivity of Metals

abstract:
  In this paper we advance a stiff solution dynamics [SSD] model to study the
regulation of local chemistry near a corroding metal by reaction and diffusion
processes in the electrolyte. Using this model we compute the detailed
space-time dynamics of the concentrations of metal ions, its hydroxy complexes,
H+ and OH- ions near the corroding metal. The time for the onset of passivity
for Fe and Zn is presented for free corrosion condition, different impressed
currents and initial pH values. The theory advanced provides much physical
insight into corrosion and passivity of metals and motivate
spectro-electrochemical studies.


title: Four-algebraic extension of the IIB matrix model

abstract:
  We make a four-algebraic extension of the IIB matrix model. The extension can
be made by any Lie 4-algebra. The four-algebraic model has the same
supersymmetry as the IIB matrix model, and hence as type IIB superstring
theory. The four-algebraic model contains twelve bosonic matrices; two of these
will be identified with two extra dimensions that characterize F-theory. We
construct a Lie 4-algebra that incorporates $u(N)$ Lie algebra and analyze the
model explicitly by choosing it. We have three phases in the model with that
specific algebra. In the first phase, it reduces to the original IIB matrix
model. In the second phase, it reduces to a simple supersymmetric model. In the
third phase, it reduces to a model that describes only the dynamics of the two
matrices representing the torus.


title:
Theory and experiment reveal unexpected calcium profiles in
  one-dimensional systems

abstract:
  Calcium is an ubiquitous second messenger that triggers a plethora of key
physiological responses. The events are initiated in micro- or nano-sized
compartments and determined by the complex interactions with calcium-binding
proteins and mechanisms of calcium clearance. Local calcium increases in the
vicinity of single channels represent an essentially non-linear
reaction-diffusion problem that have been analysed previously using various
linearized approximations. I revisited the problem of stationary patterns that
can be generated by the point calcium source in the presence of buffer and
obtained new explicit solutions. Main results of the analysis of the calcium
buffering are supplemented with pertinent derivations and discussion of
respective mathematical problems in Appendices. I show that for small calcium
influx the calcium gradients around established around channel lumen have
quasi-exponential form. For bigger fluxes, when the buffer is saturated, the
model predicts periodic patterns. The transition between the two regimes depend
on the capacity of buffer and its mobility. Theoretical predictions were
examined using a model one-dimensional system. For sufficiently big fluxes the
oscillatory calcium patterns were observed. Theoretical and experimental
results are discussed in terms of their possible physiological implications.


title: Elastic interface acoustic waves in twinned crystals

abstract:
  A new type of Interface Acoustic Waves (IAW) is presented, for single-crystal
orthotropic twins bonded symmetrically along a plane containing only one common
crystallographic axis. The effective boundary conditions show that the waves
are linearly polarized at the interface, either transversally or
longitudinally. Then the secular equation is obtained in full analytical form
using new relationships for the displacement-traction quadrivector at the
interface. For Gallium Arsenide and for Silicon, it is found that the IAWs with
transverse (resp. longitudinal) polarization at the interface are of the
Stoneley (resp. leaky) type.


title: Bounds on $Z^\prime$ from 3-3-1 model at the LHC energies

abstract:
  The Large Hadron Collider will restart with higher energy and luminosity in
2015. This achievement opens the possibility of discovering new phenomena
hardly described by the Standard Model, that is based on two neutral gauge
bosons: the photon and the $Z$. This perspective imposes a deep and systematic
study of models that predicts the existence of new neutral gauge bosons. One of
such models is based on the gauge group $SU(3)_C \times SU(3)_L \times U(1)_N$
called 3-3-1 model for short.
  In this paper we perform a study with $Z^\prime$ predicted in two versions of
the 3-3-1 model and compare the signature of this resonance in each model
version. By considering the present and future LHC energy regimes, we obtain
some distributions and the total cross section for the process $p + p
\longrightarrow \ell^{+} + \ell^{-} + X$. Additionally, we derive lower bounds
on $Z^\prime$ mass from the latest LHC results. Finally we analyze the LHC
potential for discovering this neutral gauge boson at 14 TeV center-of-mass
energy.


title:
Rayleigh waves and surface stability for Bell materials in compression;
  comparison with rubber

abstract:
  The stability of a Bell-constrained half-space in compression is studied. To
this end, the propagation of Rayleigh waves on the surface of the material when
it is maintained in a static state of triaxial prestrain is considered. The
prestrain is such that the free surface of the half-space is a principal plane
of deformation. The exact secular equation is established for surface waves
traveling in a principal direction of strain with attenuation along the
principal direction normal to the free plane. As the half-space is put under
increasing compressive loads, the speed of the wave eventually tends to zero
and the bifurcation criterion, or stability equation, is reached.
  Then the analysis is specialized to specific forms of strain energy functions
and prestrain, and comparisons are made with results previously obtained in the
case of incompressible neo-Hookean or Mooney-Rivlin materials. It is found that
these rubber-like incompressible materials may be compressed more than "Bell
empirical model" materials, but not as much as "Bell simple hyperelastic"
materials, before the critical stretches, solutions to the bifurcation
criterion, are reached. In passing, some classes of incompressible materials
which possess a relative-universal bifurcation criterion are presented.


title: Detecting an exciton crystal by statistical means

abstract:
  We investigate an ensemble of excitons in a coupled quantum well excited via
an applied laser field. Using an effective disordered quantum Ising model, we
perform a numerical simulation of the experimental procedure and calculate the
probability distribution function $P(M)$ to create $M$ excitons as well as
their correlation function. It shows clear evidence of the existence of two
phases corresponding to a liquid and a crystal phase. We demonstrate that not
only the correlation function but also the distribution $P(M)$ is very well
suited to monitor this transition.


title:
Gas Kinematics on GMC scales in M51 with PAWS: cloud stabilization
  through dynamical pressure

abstract:
  We use the high spatial and spectral resolution of the PAWS CO(1-0) survey of
the inner 9 kpc of the iconic spiral galaxy M51 to examine the effect of gas
streaming motions on the star-forming properties of individual GMCs. We compare
our view of gas flows in M51 -- which arise due to departures from axi-symmetry
in the gravitational potential (i.e. the nuclear bar and spiral arms) -- with
the global pattern of star formation as traced by Halpha and 24\mu m emission.
We find that the dynamical environment of GMCs strongly affects their ability
to form stars, in the sense that GMCs situated in regions with large streaming
motions can be stabilized, while similarly massive GMCs in regions without
streaming go on to efficiently form stars. We argue that this is the result of
reduced surface pressure felt by clouds embedded in an ambient medium
undergoing large streaming motions, which prevents collapse. Indeed, the
variation in gas depletion time expected based on the observed streaming
motions throughout the disk of M51 quantitatively agrees with the variation in
observed gas depletion time scale. The example of M51 shows that streaming
motions, triggered by gravitational instabilities in the form of bars and
spiral arms, can alter the star formation law; this can explain the variation
in gas depletion time among galaxies with different masses and morphologies. In
particular, we can explain the long gas depletion times in spiral galaxies
compared to dwarf galaxies and starbursts. We suggest that adding a dynamical
pressure term to the canonical free-fall time produces a single star formation
law that can be applied to all star-forming regions and galaxies, across cosmic
time.


title:
Strong renormalization of the electronic band gap due to lattice
  polarization in the GW formalism

abstract:
  The self-consistent GW band gaps are known to be significantly overestimated.
We show that this overestimation is, to a large extent, due to the neglect of
the contribution of the lattice polarization to the screening of the
electron-electron interaction. To solve this problem, we derive within the GW
formalism a generalized plasmon-pole model that accounts for lattice
polarization. The resulting GW self-energy is used to calculate the band
structures of a set of binary semiconductors and insulators. The lattice
contribution always decreases the band gap. The shrinkage increases with the
size of the longitudinal-transverse optical splitting and it can represent more
than 15% of the band gap in highly polar compounds, reducing the band-gap
percentage error by a factor of three.


title: Testing Quantum Gravity by Quantum Light

abstract:
  In the last years quantum correlations received large attention as key
ingredient in advanced quantum metrology protocols, in this letter we show that
they provide even larger advantages when considering multiple-interferometer
setups. In particular we demonstrate that the use of quantum correlated light
beams in coupled interferometers leads to substantial advantages with respect
to classical light, up to a noise-free scenario for the ideal lossless case. On
the one hand, our results prompt the possibility of testing quantum gravity in
experimental configurations affordable in current quantum optics laboratories
and strongly improve the precision in "larger size experiments" such as the
Fermilab holometer; on the other hand, they pave the way for future
applications to high precision measurements and quantum metrology.


title:
Interplay between energy dissipation and reservoir-induced
  thermalization in nonequilibrium quantum nanodevices

abstract:
  A solid state electronic nanodevice is an intrinsically open quantum system,
exchanging both energy with the host material and carriers with connected
reservoirs. Its out-of-equilibrium behavior is determined by a non-trivial
interplay between electronic dissipation and decoherence induced by inelastic
processes within the device, and the coupling of the latter to metallic
electrodes. We propose a unified description, based on the density matrix
formalism, that accounts for both these aspects, enabling to predict various
steady-state as well as ultrafast nonequilibrium phenomena, nowadays
experimentally accessible. More specifically, we derive a generalized
density-matrix equation, particularly suitable for the design and optimization
of a wide class of electronic and optoelectronic quantum devices. The power and
flexibility of this approach is demonstrated with the application to a
photoexcited triple-barrier nanodevice.


title: A Characterization of Saturated Designs for Factorial Experiments

abstract:
  In this paper we study saturated fractions of factorial designs under the
perspective of Algebraic Statistics. We define a criterion to check whether a
fraction is saturated or not with respect to a given model. The proposed
criterion is based purely on combinatorial objects. Our technique is
particularly useful when several fractions are needed. We also show how to
generate random saturated fractions with given projections, by applying the
theory of Markov bases for contingency tables.


title: Geometric Stable processes and related fractional differential equations

abstract:
  We are interested in the differential equations satisfied by the density of
the Geometric Stable processes
$\mathcal{G}_{\alpha}^{\beta}=\left\{\mathcal{G}_{\alpha}^{\beta}(t);t\geq
0\right\} $, with stability \ index $% \alpha \in (0,2]$ and asymmetry
parameter $\beta \in \lbrack -1,1]$, both in the univariate and in the
multivariate cases. We resort to their representation as compositions of stable
processes with an independent Gamma subordinator. As a preliminary result, we
prove that the latter is governed by a differential equation expressed by means
of the shift operator. As a consequence, we obtain the space-fractional
equation satisfied by the density of $\mathcal{G}_{\alpha}^{\beta}.$ For some
particular values of $% \alpha $ and $\beta ,$ we get some interesting results
linked to well-known processes, such as the Variance Gamma process and the
first passage time of the Brownian motion.


title:
Improving continuous-variable entanglement distribution by separable
  states

abstract:
  We investigate the physical mechanism behind the counterintuitive phenomenon,
the distribution of continuous-variable entanglement between two distant modes
by sending a third separable auxiliary mode between them. For this purpose, we
propose a new more simple and more efficient protocol resulting in distributed
entanglement with more than an order of the magnitude higher logarithmic
negativity than in the previously proposed protocol. This new protocol shows
that the distributed entanglement originates from the entanglement of one mode
and the auxiliary mode used for distribution which is first destroyed by local
correlated noises and restored subsequently by the interference of the
auxiliary mode with the second distant separable correlated mode.


title: Potential Analysis in Holographic Schwinger Effect

abstract:
  We analyze electrostatic potentials in the holographic Schwinger effect. The
potential barrier for the pair production is estimated by a static potential
consisting of static mass energies, an electric potential from an external
electric-field, and the Coulomb potential between a particle and an
antiparticle. Given that the Coulomb potential is supposed to be evaluated by
the minimal surface attaching on the conformal boundary as usual, the critical
field, where the potential barrier vanishes, exhibits a deviation of 30% from
the one obtained from the Dirac-Born-Infeld (DBI) action. We reconsider this
issue by reexamining the Coulomb-potential part, which is evaluated by the
classical action of a string solution attaching on a probe D3-brane sitting at
an intermediate position in the bulk AdS. Then the resulting critical-field
completely agrees with the DBI result. This agreement gives rise to a strong
support for the holographic scenario. We also discuss the finite-temperature
case and the temperature-dependent critical-field also agrees with the DBI
result.


title: On the field theory expansion of superstring five point amplitudes

abstract:
  A simple recursive expansion algorithm for the integrals of tree level
superstring five point amplitudes in a flat background is given which reduces
the expansion to simple symbol(ic) manipulations. This approach can be used for
instance to prove the expansion is maximally transcendental to all orders and
to verify several conjectures made in recent literature to high order. Closed
string amplitudes follow from these open string results by the KLT relations.
To obtain insight into these results in particular the maximal R-symmetry
violating amplitudes (MRV) in type IIB superstring theory are studied. The
obtained expansion of the open string amplitudes reduces the analysis for MRV
amplitudes to the classification of completely symmetric polynomials of the
external legs, up to momentum conservation. Using Molien's theorem as a
counting tool this problem is solved by constructing an explicit nine element
basis for this class. This theorem may be of wider interest: as is illustrated
at higher points it can be used to calculate dimensions of polynomials of
external momenta invariant under any finite group for in principle any number
of legs, up to momentum conservation.


title:
Critical case stochastic phylogenetic tree model via the Laplace
  transform

abstract:
  Birth-and-death models are now a common mathematical tool to describe
branching patterns observed in real-world phylogenetic trees. Liggett and
Schinazi (2009) is one such example. The authors propose a simple
birth-and-death model that is compatible with phylogenetic trees of both
influenza and HIV, depending on the birth rate parameter. An interesting
special case of this model is the critical case where the birth rate equals the
death rate. This is a non-trivial situation and to study its asymptotic
behaviour we employed the Laplace transform. With this we correct the proof of
Liggett and Schinazi (2009) in the critical case.


title:
From Ordinary Differential Equations to Structural Causal Models: the
  deterministic case

abstract:
  We show how, and under which conditions, the equilibrium states of a
first-order Ordinary Differential Equation (ODE) system can be described with a
deterministic Structural Causal Model (SCM). Our exposition sheds more light on
the concept of causality as expressed within the framework of Structural Causal
Models, especially for cyclic models.


title: Birkhoff's version of Hilbert's metric and its applications in analysis

abstract:
  This is a survey article concerning applications of Hilbert's metric in the
analysis and dynamics of linear and nonlinear mappings on cones. It will appear
as a chapter in the "Handbook of Hilbert geometry", ed. G. Besson, A.
Papadopoulos and M. Troyanov, European Mathematical Society Publishing House,
Z\"urich.


title: One pendulum to run them all

abstract:
  The analytical solution of the three--dimensional linear pendulum in a
rotating frame of reference is obtained, including Coriolis and centrifugal
accelerations, and expressed in terms of initial conditions. This result offers
the possibility of treating Foucault and Bravais pendula as trajectories of the
very same system of equations, each of them with particular initial conditions.
We compare with the common two--dimensional approximations in textbooks. A
previously unnoticed pattern in the three--dimensional Foucault pendulum
attractor is presented.


title: A free subgroup in the image of the 4-strand Burau representation

abstract:
  It is known that the Burau representation of the 4-strand braid group is
faithful if and only if certain matrices f and k generate a (non-abelian) free
group. Regarding f and k as isometries of a euclidean building we show that f^3
and k^3 generate a free group. We give two proofs, one utilizing the metric
geometry of the building, and the other using simplicial retractions.


title:
Cosmological Perturbations of a Quartet of Scalar Fields with a
  Spatially Constant Gradient

abstract:
  We consider the linear perturbations for the single scalar field inflation
model interacting with an additional triad of scalar fields. The background
solutions of the three additional scalar fields depend on spatial coordinates
with a constant gradient $\alpha$ and the ensuing evolution preserves the
homogeneity of the cosmological principle. After we discuss the properties of
background evolution including an exact solution for the exponential-type
potential, we investigate the linear perturbations of the scalar and tensor
modes in the background of the slow-roll inflation. In our model with small
$\alpha$, the comoving wavenumber has {\it a lower bound} $\sim \alpha M_{\rm
P}$ to have well-defined initial quantum states. We find that cosmological
quantities, for instance, the power spectrums and spectral indices of the
comoving curvature and isocurvature perturbations, and the running of the
spectral indices have small corrections depending on {\it the lower bound}.
Similar behaviors happen for the tensor perturbation with the same lower bound.


title: 1/f noise: implications for solid-state quantum information

abstract:
  The efficiency of the future devices for quantum information processing will
be limited mostly by the finite decoherence rates of the individual qubits and
quantum gates. Recently, substantial progress was achieved in enhancing the
time within which a solid-state qubit demonstrates coherent dynamics. This
progress is based mostly on a successful isolation of the qubits from external
decoherence sources obtained by clever engineering. Under these conditions, the
material-inherent sources of noise start to play a crucial role. In most cases,
quantum devices are affected by noise decreasing with frequency, f,
approximately as 1/f. According to the present point of view, such noise is due
to material- and device-specific microscopic degrees of freedom interacting
with quantum variables of the nanodevice. The simplest picture is that the
environment that destroys the phase coherence of the device can be thought of
as a system of two-state fluctuators, which experience random hops between
their states. If the hopping times are distributed in a exponentially broad
domain, the resulting fluctuations have a spectrum close to 1/f in a large
frequency range. In this paper we review the current state of the theory of
decoherence due to degrees of freedom producing 1/f noise. We discuss basic
mechanisms of such noises in various nanodevices and then review several models
describing the interaction of the noise sources with quantum devices. The main
focus of the review is to analyze how the 1/f noise destroys their coherent
operation. We start from individual qubits concentrating mostly on the devices
based on superconductor circuits, and then discuss some special issues related
to more complicated architectures. Finally, we consider several strategies for
minimizing the noise-induced decoherence.


title: How to detect a genuine quantum pump effect in graphene?

abstract:
  Quantum pumping in graphene has been predicted in recent years. Till date
there have been no experiments indicating a graphene based quantum pump. This
is not uncommon as in case of other non-Dirac behavior showing materials it has
not yet been unambiguously experimentally detected. The reason being that in
experiments with such materials the rectification effect overshadows the pumped
current. In this work we answer the question posed in the title by taking
recourse to "strain". We show that the symmetries of the rectified and pumped
currents towards strain reversal can effectively distinguish between the two.

categories: cond-mat.mes-hall cond-mat.mtrl-sci math-ph math.MP quant-ph


title:
Higgs production through vector-boson fusion at the NLO matched with
  parton showers

abstract:
  We present a study of Higgs hadroproduction through vector-boson fusion at
the NLO in QCD matched with parton showers. We discuss the matching systematics
affecting this process through a comparison of the aMC@NLO predictions with the
POWHEG and the pure-NLO ones.


title:
Accurate and Robust Indoor Localization Systems using Ultra-wideband
  Signals

abstract:
  Indoor localization systems that are accurate and robust with respect to
propagation channel conditions are still a technical challenge today. In
particular, for systems based on range measurements from radio signals,
non-line-of-sight (NLOS) situations can result in large position errors. In
this paper, we address these issues using measurements in a representative
indoor environment. Results show that conventional tracking schemes using high-
and a low-complexity ranging algorithms are strongly impaired by NLOS
conditions unless a very large signal bandwidth is used. Furthermore, we
discuss and evaluate the performance of multipath-assisted indoor navigation
and tracking (MINT), that can overcome these impairments by making use of
multipath propagation. Across a wide range of bandwidths, MINT shows superior
performance compared to conventional schemes, and virtually no degradation in
its robustness due to NLOS conditions.


title:
Carbon mono and dioxide hydrogenation over pure and metal oxide
  decorated graphene oxide substrates: insight from DFT

abstract:
  Based on first principles density functional theory calculations we explore
the energetics of the conversion of carbon mono and dioxide to methane over
graphene oxide surfaces. Similar to the recently discovered hydration of
various organic species over this catalyst, the transfer of hydrogen atoms from
hydroxyl groups of graphene oxide provide a step by step transformation
hydrogenation of carbon oxides. Estimated yields of modeled reactions at room
temperature are about 0.01% for the carbon mono and dioxide. For the modeling
of graphene oxide/metal oxide composites, calculations in the presence of MO_2
(where M = V, Cr, Mn, Fe) have been performed. Results of these calculations
demonstrate significant decreases of the energy costs and increases of reaction
yields to 0.07%, which is comparable to the efficiency of these reactions over
platinum and ruthenium-based photocatalysts. Increasing the temperature to the
value 100C should provide the total conversion of carbon mono and dioxides.


title:
Comment on Wibral et al. (2013): Measuring information-transfer delays,
  PloS ONE 8(2): e55809

abstract:
  Wibral et al. propose a measure of interaction delays rooted in an
information-theoretic framework and contrast their measure with the bivariate
momentary information transfer (MIT), introduced in Pompe, B., & Runge, J.
(2011). Momentary information transfer as a coupling measure of time series.
Phys. Rev. E, 83(5), 1-12. In this version we correct an error in a previous
version of this comment.


title:
Pressure-induced Topological Phase Transitions in Rock-salt
  Chalcogenides

abstract:
  By means of a comprehensive theoretical investigation, we show that external
pressure can induce topological phase transitions in IV-VI semiconducting
chalcogenides with rock-salt structure. These materials satisfy mirror
symmetries that are needed to sustain topologically protected surface states,
at variance with time-reversal symmetry responsible for gapless edge states in
$\mathcal{Z}_{2}$ topological insulators. The band inversions at high-symmetry
points in the Brillouin zone that are related by mirror symmetry, are brought
about by an "asymmetric" hybridization between cation and anion $sp$ orbitals.
By working out the microscopic conditions to be fulfilled in order to maximize
this hybridization, we identify materials in the rock-salt chalcogenide class
that are prone to undergo a topological phase transition induced by pressure
and/or alloying. Our model analysis is fully comfirmed by complementary
advanced \textit{first-principles} calculations and \textit{ab initio}-based
tight-binding simulations.


title:
The near shift-invariance of the dual-tree complex wavelet transform
  revisited

abstract:
  The dual-tree complex wavelet transform (DTCWT) is an enhancement of the
conventional discrete wavelet transform (DWT) due to a higher degree of
shift-invariance and a greater directional selectivity, finding its
applications in signal and image processing. This paper presents a quantitative
proof of the superiority of the DTCWT over the DWT in case of modulated
wavelets.


title:
Antiferromagnetic topological insulator state in the correlated
  Bernevig-Hughes-Zhang model

abstract:
  We study the effects of electron correlations on the topological phase
transition in the Bernevig-Hughes-Zhang model using the variational cluster
approach where the short-range spatial correlations are taken into account
exactly. We calculate the spin Chern number and local magnetic moment to show
that the topologically nontrivial antiferromagnetic order exists and that the
magnetic transition is of the second order. We furthermore demonstrate that
under the spin-quantized condition the topological phase transition is caused
by the closing of the bulk band gap.


title: Maximum Lebesgue Extension of Monotone Convex Functions

abstract:
  Given a monotone convex function on the space of essentially bounded random
variables with the Lebesgue property (order continuity), we consider its
extension preserving the Lebesgue property to as big solid vector space of
random variables as possible. We show that there exists a maximum such
extension, with explicit construction, where the maximum domain of extension is
obtained as a (possibly proper) subspace of a natural Orlicz-type space,
characterized by a certain uniform integrability property. As an application,
we provide a characterization of the Lebesgue property of monotone convex
function on arbitrary solid spaces of random variables in terms of uniform
integrability and a "nice" dual representation of the function.


title:
Mechanism of Polarization Fatigue in BiFeO3: the Role of Schottky
  Barrier

abstract:
  By using piezoelectric force microscopy and scanning Kelvin probe microscopy,
we have investigated the domain evolution and space charge distribution in
planar BiFeO3 capacitors with different electrodes. It is observed that charge
injection at the film/electrode interface leads to domain pinning and
polarization fatigue in BiFeO3. Furthermore, the Schottky barrier at the
interface is crucial for the charge injection process. Lowering the Schottky
barrier by using low work function metals as the electrodes can also improve
the fatigue property of the device, similar to what oxide electrodes can
achieve.


title:
Integral Representations and Decompositions of Operator Monotone
  Functions on the Nonnegative Reals

abstract:
  In this paper, we show that there is a one-to-one correspondence between
operator monotone functions on the nonnegative reals and finite Borel measures
on the unit interval. This correspondence appears as an integral representation
of special operator monotone functions $x \mapsto 1\,!_t\,x$ for $t \in [0,1]$
with respect to a finite Borel measure on $[0,1]$, here $!_t$ denotes the
$t$-weighted harmonic mean. Hence such functions form building blocks for
arbitrary operator monotone functions on the nonnegative reals. Moreover, we
use this integral representation to decompose operator monotone functions.


title:
Branching laws for tensor modules over classical locally finite Lie
  algebras

abstract:
  Let g' and g be isomorphic to any two of the Lie algebras gl(infty),
sl(infty), sp(infty), and so(infty). Let M be a simple tensor g-module. We
introduce the notion of an embedding of g' into g of general tensor type and
derive branching laws for triples g', g, and M, where the embedding of g' into
g is of general tensor type. More precisely, since M is in general not
semisimple as a g'-module, we determine the socle filtration of M over g'. Due
to the description of embeddings of classical locally finite Lie algebras given
by Dimitrov and Penkov, our results hold for all possible embeddings of g' into
g unless g' is isomorphic to gl(infty).


title:
Choirs, HI Galaxy Groups: Catalogue and Detection of Star-forming Dwarf
  Group Members

abstract:
  H{\alpha} observations centred on galaxies selected from the HI Parkes All
Sky Survey (HIPASS, Barnes et al. 2001) typically show one and sometimes two
star-forming galaxies within the approximately 15-arcminute beam of the Parkes
64-m HI detections. In our Survey of Ionization in Neutral Gas Galaxies (SINGG,
Meurer et al. 2006) we found fifteen cases of HIPASS sources containing four or
more emission line galaxies (ELGs). We name these fields Choir groups. In the
most extreme case we found a field with at least nine ELGs. In this paper we
present a catalogue of Choir group members in the context of the wider SINGG
sample. The dwarf galaxies in the Choir groups would not be individually
detectable in HIPASS at the observed distances if they were isolated, but are
detected in SINGG narrow-band imaging due to their membership of groups with
sufficiently large total HI mass. The ELGs in these groups are similar to the
wider SINGG sample in terms of size, H{\alpha} equivalent width, and surface
brightness. Eight of these groups have two large spiral galaxies with several
dwarf galaxies and may be thought of as morphological analogues of the Local
Group. However, on average our groups are not significantly HI-deficient,
suggesting that they are at an early stage of assembly, and more like the M81
group. The Choir groups are very compact at typically only 190 kpc in projected
distance between the two brightest members. They are very similar to SINGG
fields in terms of star formation efficiency (the ratio of star formation rate
to HI mass; SFE), showing an increasing trend in SFE with stellar mass.


title: A non-perturbative argument for the non-abelian Higgs mechanism

abstract:
  The evasion of massless Goldstone bosons by the non-abelian Higgs mechanism
is proved by a non-perturbative argument in the local BRST gauge.


title:
The dependence of the atomic energy levels on a superstrong magnetic
  field with account of a finite nucleus radius and mass

abstract:
  The influence of the finiteness of the proton radius and mass on the energies
of a hydrogen atom and hydrogen-like ions in a superstrong magnetic field is
studied. The finiteness of the nucleus size pushes the ground energy level up
leading to a nontrivial dependence of the value of critical nucleus charge on
the external magnetic field.


title:
Metric-Like Formalism for Matter Fields Coupled to 3D Higher Spin
  Gravity

abstract:
  Action integral for a matter system composed of 0- and 2-forms, $C$ and
$B_{\mu\nu}$, topologically coupled to 3D spin-3 gravity is considered first in
the frame-like formalism. The field $C$ satisfies an eq of motion,
$\partial_{\mu} \, C+A_{\mu} \, C-C \, \bar{A}_{\mu}=0$. With a suitable gauge
fixing of a new local symmetry and diffeomorphism, only one component of
$B_{\mu\nu}$, say $B_{\phi r}$, remains non-vanishing and satisfies an equation
similar to that for $C$ with $A_{\mu}$ and $\bar{A}_{\mu}$ interchanged. The
spin connection is eliminated by solving the eq of motion for the total action,
and in the resulting metric-like formalism, $(BC)^2$ interaction terms are
induced because of the torsion. The world-volume components of the matter
field, $C^0$, $C^{\mu}$ and $C^{(\mu\nu)}$, are introduced by contracting the
local-frame index of $C$ with those of the inverse vielbeins, $E_a^{\mu}$ and
$E_a^{(\mu\nu)}$, which were defined by the present authors in ArXiv:1209.0894
[hep-th].
  The metric-like fields, as well as the new connections and the generalized
curvature tensors, introduced in the above mentioned paper, are explicitly
expressed in terms of the metric $g_{\mu\nu}$ and the spin-3 field
$\phi_{\mu\nu\lambda}$ by means of the $\phi$-expansion. The action integral
for the pure spin-3 gravity in the metric-like formalism up to ${\cal
O}(\phi^2)$, obtained before in the literature, is re-derived. Then the matter
action is re-expressed in terms of $g_{\mu\nu}$, $\phi_{\mu\nu\rho}$ and the
covariant derivatives for spin-3 geometry. Spin-3 gauge transformation is
extended to the matter fields.


title:
ManTIME: Temporal expression identification and normalization in the
  TempEval-3 challenge

abstract:
  This paper describes a temporal expression identification and normalization
system, ManTIME, developed for the TempEval-3 challenge. The identification
phase combines the use of conditional random fields along with a
post-processing identification pipeline, whereas the normalization phase is
carried out using NorMA, an open-source rule-based temporal normalizer. We
investigate the performance variation with respect to different feature types.
Specifically, we show that the use of WordNet-based features in the
identification task negatively affects the overall performance, and that there
is no statistically significant difference in using gazetteers, shallow parsing
and propositional noun phrases labels on top of the morphological features. On
the test data, the best run achieved 0.95 (P), 0.85 (R) and 0.90 (F1) in the
identification phase. Normalization accuracies are 0.84 (type attribute) and
0.77 (value attribute). Surprisingly, the use of the silver data (alone or in
addition to the gold annotated ones) does not improve the performance.


title:
Numerical investigation of the interaction between the martensitic
  transformation front and the plastic strain in austenite

abstract:
  Phase-field simulations of the martensitic transformation (MT) in the
austenitic matrix, which has already undergone the plastic deformation, are
carried out. For this purpose the elasto-plastic phase-field approach of
incoherent MT developed in the previous work [Kundin et. al. J. Mech. and Phys.
Solids 59 (2011) 2012] is used. The evolution equation for the dislocation
density field is extended by taking into account the thermal and athermal
annihilation of the dislocations in the austenitic matrix and the athermal
annihilation at the transformation front. It is shown that the plastic
deformation in the austenite caused by the MT interacts with the pre-deformed
plastic strain that leads to the inhomogeneous increasing of the total
dislocation density. During the phase transformation one part of the
dislocations in the pre-deformed austenite is inherited by the martensitic
phase and this inheritance depends on the crystallography of MT. An other part
of dislocations annihilates at the transformation front and decreases the
dislocation density in the growing martensite. Based on the simulation results
a phenomenological dependency of the inherited dislocations on the martensitic
fraction and the plastic deformation in the martensite and austenitic matrix is
proposed.


title:
Exterior integrability: Yang-Baxter form of nonequilibrium steady state
  density operator

abstract:
  A new type of quantum transfer matrix, arising as a Cholesky factor for the
steady state density matrix of a dissipative Markovian process associated with
the boundary-driven Lindblad equation for the isotropic spin-1/2 Heisenberg
(XXX) chain, is presented. The transfer matrix forms a commuting family of
non-Hermitian operators depending on the spectral parameter which is
essentially the strength of dissipative coupling at the boundaries. The
intertwining of the corresponding Lax and monodromy matrices is performed by an
infinitely dimensional Yang-Baxter R-matrix which we construct explicitly and
which is essentially different from the standard XXX R-matrix. We also discuss
a possibility to construct Bethe Ansatz for the spectrum and eigenstates of the
non-equilibrium steady state density operator. Furthermore, we indicate the
existence of a deformed R-matrix in the infinitely-dimensional auxiliary space
for the anisotropic XXZ spin-1/2 chain which in general provides a sequence of
new, possibly quasi-local, conserved quantities of the bulk XXZ dynamics.

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


title: A unified view on weakly correlated recurrent networks

abstract:
  The diversity of neuron models used in contemporary theoretical neuroscience
to investigate specific properties of covariances raises the question how these
models relate to each other. In particular it is hard to distinguish between
generic properties and peculiarities due to the abstracted model. Here we
present a unified view on pairwise covariances in recurrent networks in the
irregular regime. We consider the binary neuron model, the leaky
integrate-and-fire model, and the Hawkes process. We show that linear
approximation maps each of these models to either of two classes of linear rate
models, including the Ornstein-Uhlenbeck process as a special case. The classes
differ in the location of additive noise in the rate dynamics, which is on the
output side for spiking models and on the input side for the binary model. Both
classes allow closed form solutions for the covariance. For output noise it
separates into an echo term and a term due to correlated input. The unified
framework enables us to transfer results between models. For example, we
generalize the binary model and the Hawkes process to the presence of
conduction delays and simplify derivations for established results. Our
approach is applicable to general network structures and suitable for
population averages. The derived averages are exact for fixed out-degree
network architectures and approximate for fixed in-degree. We demonstrate how
taking into account fluctuations in the linearization procedure increases the
accuracy of the effective theory and we explain the class dependent differences
between covariances in the time and the frequency domain. Finally we show that
the oscillatory instability emerging in networks of integrate-and-fire models
with delayed inhibitory feedback is a model-invariant feature: the same
structure of poles in the complex frequency plane determines the population
power spectra.


title:
Interpreting the von Neumann entropy of graph Laplacians, and coentropic
  graphs

abstract:
  For any graph, we define a rank-1 operator on a bipartite tensor product
space, with components associated to the set of vertices and edges
respectively. We show that the partial traces of the operator are the Laplacian
and the edge-Laplacian. This provides an interpretation of the von Neumann
entropy of the (normalized)\ Laplacian as the amount of quantum entanglement
between two systems corresponding to vertices and edges. In this framework,
cospectral graphs correspond exactly to local unitarily equivalent pure states.
Finally, we introduce the notion of coentropic graphs, that is, graphs with
equal von Neumann entropy. The smallest coentropic (but not cospectral) graphs
that we are able to construct have 8 vertices. The number of equivalence
classes of coentropic graphs with n vertices and m edges is a lower bound to
the number of (pure) bipartite entanglement classes with subsystems of
corresponding dimension.


title:
Evolution of the electronic state through the reduction annealing in
  electron-doped Pr_1.3-x_La_0.7_Ce_x_CuO_4+delta_ (x=0.10) single crystals:
  Antiferromagnetism, Kondo effect and superconductivity

abstract:
  The evolution of the electronic state through the reduction annealing has
been investigated in electron-doped Pr_1.3-x_La_0.7_Ce_x_CuO_4+delta_ (x=0.10)
single crystals with the so-called T' structure. From the ab plane and c axis
electrical resistivity measurements in magnetic fields, it has been found that,
through the reduction annealing, the strongly localized state of carriers
accompanied by the antiferromagnetic (AF) pseudogap in the as-grown crystal
changes to a metallic state bringing about the Kondo effect without AF
pseudogap and to a superconducting state. These results are able to be
understood in terms of a model based on the strong electron correlation. The
complete removal of excess oxygen in the T'-cuprates is expected to result in
the appearance of superconductivity in a wide range of the Ce concentration
including the parent compound of x=0.


title: Convolutional Neural Networks learn compact local image descriptors

abstract:
  A standard deep convolutional neural network paired with a suitable loss
function learns compact local image descriptors that perform comparably to
state-of-the art approaches.


title:
Entropic corrections and modified Friedmann equations in the emergence
  of cosmic space

abstract:
  In the emergent cosmic space scenario recently proposed by Padmanabhan, the
expansion of the universe is attributed to the difference between the number of
degrees of freedom on a holographic surface and the one in the bulk. Based on
this idea, we explore the cases where logarithmic and power-law entropic
corrections are present, respectively. The previously found modified Friedmann
equations are reproduced through an improved proposal, and we show that the
same results can be obtained using a generalized expansion law.


title:
A Challenging Solar Eruptive Event of 18 November 2003 and the Causes of
  the 20 November Geomagnetic Superstorm. I. Unusual History of an Eruptive
  Filament

abstract:
  This is the first of four companion papers, which analyze a complex eruptive
event of 18 November 2003 in AR 10501 and the causes of the largest Solar Cycle
23 geomagnetic storm on 20 November 2003. Analysis of a complete data set, not
considered before, reveals a chain of eruptions to which hard X-ray and
microwave bursts responded. A filament in AR 10501 was not a passive part of a
larger flux rope, as usually considered. The filament erupted and gave origin
to a CME. The chain of events was as follows: i) an eruption at 07:29
accompanied by a not reported M1.2 class flare associated with the onset of a
first southeastern CME1, which is not responsible for the superstorm; ii) a
confined eruption at 07:41 (M3.2 flare) that destabilized the filament; iii)
the filament acceleration (07:56); iv) the bifurcation of the eruptive filament
that transformed into a large cloud; v) an M3.9 flare in AR 10501 associated to
this transformation. The transformation of the filament could be due to its
interaction with the magnetic field in the neighborhood of a null point,
located at a height of about 100 Mm above the complex formed by ARs 10501,
10503, and their environment. The CORONAS-F/SPIRIT telescope observed the cloud
in 304 A as a large Y-shaped darkening, which moved from the bifurcation region
to the limb. The masses and kinematics of the cloud and the filament were
similar. Remnants of the filament were not observed in the second southwestern
CME2, previously regarded as a source of the 20 November superstorm. These
facts do not support a simple scenario, in which the interplanetary magnetic
cloud is considered as a flux rope formed from a structure initially associated
with the pre-eruption filament in AR 10501. Observations suggest a possible
additional eruption above the bifurcation region close to solar disk center
between 08:07 and 08:17 that could be the source of the superstorm.


title: Saturated symmetric nuclear matter in strong magnetic fields

abstract:
  Strongly magnetized symmetric nuclear matter is investigated within the
context of effective baryon-meson exchange models. The magnetic field is
coupled to the charge as well as the dipole moment of the baryons by including
the appropriate terms in the Lagrangian density. The saturation density of
magnetized, symmetric nuclear matter was calculated for magnetic fields of the
order of 10^17 gauss. For the calculated range of saturation densities the
binding energy, symmetry energy coefficient and compressibility of nuclear
matter were also calculated. It is found that with an increasing magnetic field
the saturation density increases, while the system becomes less bound.
Furthermore, the depopulation of proton Landau levels leaves a distinct
fluctuating imprint on the symmetry energy coefficient and compressibility. The
calculations were also performed for increased values of the baryon magnetic
dipole moment. By increasing the dipole moment strength the saturation density
is found to decrease, but the system becomes more tightly bound while the
fluctuations in the symmetry energy coefficient and compressibility persist.


title: Orderings on Calogero-Moser partition of imprimitive groups

abstract:
  We extend to all parameters the constructions of the geometric and
combinatorial orders on Irr G(l,1,n) due to I. Gordon, as well as the relations
with the a and c-functions. This allows us to generalize these properties for
the group G(l,e,n), at least when n is not divided by e.


title: Parameter Extraction and Support-Loss in MEMS Resonators

abstract:
  In this paper it is shown how the equivalent circuit parameters of a MEMS
resonator can be simply obtained from an eigenfrequency simulation.
Additionally, it is demonstrated that the Q-factor as a result of support
losses in a MEMS resonator can be determined using a matched boundary layer.
The method is applied to calculate the frequency dependent admittance of a
diamond disk resonator. Results agree well with measurements and analytic
results. Comparison to a frequency response analysis establishes the validity
of the method and shows that it results in a large reduction of the simulation
time.


title:
Combination versus sequential monotherapy in chronic HBV infection: a
  mathematical approach

abstract:
  Sequential monotherapy is the most widely used therapeutic approach in the
treatment of HBV chronic infection. Unfortunately, under therapy, in some
patients the hepatitis virus mutates and gives rise to variants which are drug
resistant. We conjecture that combination therapy is able to delay drug
resistance for a longer time than sequential monotherapy. To study the action
of these two therapeutic approaches in the event of unknown mutations and to
explain the emergence of drug resistance, we propose a stochastic model for the
infection within a patient which is treated with two drugs, either sequentially
or contemporaneously, and develops a two-step mutation which is resistant to
both drugs. We study the deterministic approximation of our stochastic model
and give a biological interpretation of its asymptotic behaviour. We compare
the time when this new strain first reaches detectability in the serum viral
load. Our results show that the best choice is to start an early combination
therapy, which allows to stay drug-resistance free for a longer time.


title: Achieving Precise Mechanical Control in Intrinsically Noisy Systems

abstract:
  How can precise control be realised in intrinsically noisy systems? Here, we
develop a general theoretical framework that provides a way to achieve precise
control in signal-dependent noisy environments. When the control signal has
Poisson or supra-Poisson noise, precise control is not possible. If, however,
the control signal has sub-Poisson noise, then precise control is possible. For
this case, the precise control solution is not a function, but a rapidly
varying random process that must be averaged with respect to a governing
probability density functional. Our theoretical approach is applied to the
control of straight-trajectory arm movement. Sub-Poisson noise in the control
signal is shown to be capable of leading to precise control. Intriguingly, the
control signal for this system has a natural counterpart, namely the bursting
pulses of neurons --trains of Dirac-delta functions-- in biological systems to
achieve precise control performance.


title:
Estimating Moving Average Processes with an improved version of Durbin's
  Method

abstract:
  This paper provides a simple method to estimate both univariate and
multivariate MA processes. Similar to Durbin's method, it rests on the
recursive relation between the parameters of the MA process and those of its AR
representation. This recursive relation is shown to be valid both for
invertible / stable and non invertible / unstable processes under the
assumption that the process has no constant and started from zero. This makes
the method suitable for unit root processes, too.


title:
On the Erd\H{o}s-Ginzburg-Ziv invariant and zero-sum Ramsey number for
  intersecting families

abstract:
  Let $G$ be a finite abelian group, and let $m>0$ with $\exp(G)\mid m$. Let
$s_{m}(G)$ be the generalized Erd\H{o}s-Ginzburg-Ziv invariant which denotes
the smallest positive integer $d$ such that any sequence of elements in $G$ of
length $d$ contains a subsequence of length $m$ with sum zero in $G$. For any
integer $r>0$, let $\mathcal{I}_m^{(r)}$ be the collection of all $r$-uniform
intersecting families of size $m$. Let $R(\mathcal{I}_m^{(r)},G)$ be the
smallest positive integer $d$ such that any $G$-coloring of the edges of the
complete $r$-uniform hypergraph $K_{d}^{(r)}$ yields a zero-sum copy of some
intersecting family in $\mathcal{I}_m^{(r)}$. Among other results, we mainly
prove that $\Omega(s_{m}(G))-1\leq R (\mathcal{I}_{m}^{(r)}, \ G)\leq
\Omega(s_{m}(G)),$ where $\Omega(s_{m}(G))$ denotes the least positive integer
$n$ such that ${n-1 \choose r-1}\geq s_{m}(G)$, and we show that if $r\mid
\Omega(s_{m}(G))-1$ then $R (\mathcal{I}_{m}^{(r)}, \ G)= \Omega(s_{m}(G))$.


title:
Polarized superradiance from delocalized exciton transitions in
  tetracene single crystals

abstract:
  Polarized superradiant emission and exciton delocalization in tetracene
single crystals are reported. Polarization-, time-, and temperature-resolved
spectroscopy evidence the complete polarization of the zero-phonon line of the
intrinsic tetracene emission from both the lower (F state) and the upper
(thermally activated) Davydov excitons. The superradiance of the F emission is
substantiated by a nearly linear decrease of the radiative lifetime with
temperature, being fifteen times shorter at 30 K compared to the isolated
molecule, with an exciton delocalization of about 40 molecules.


title: Optimal Planar Orthogonal Skyline Counting Queries

abstract:
  The skyline of a set of points in the plane is the subset of maximal points,
where a point $(x,y)$ is maximal if no other point $(x',y')$ satisfies $x'\ge
x$ and $y'\ge Y$. We consider the problem of preprocessing a set $P$ of $n$
points into a space efficient static data structure supporting orthogonal
skyline counting queries, i.e. given a query rectangle $R$ to report the size
of the skyline of $P$ intersected with $R$. We present a data structure for
storing n points with integer coordinates having query time $O(\lg n/\lg\lg n)$
and space usage $O(n)$. The model of computation is a unit cost RAM with
logarithmic word size. We prove that these bounds are the best possible by
presenting a lower bound in the cell probe model with logarithmic word size:
Space usage $n\lg^{O(1)} n$ implies worst case query time $\Omega(\lg n/\lg\lg
n)$.


title:
A strictly stationary $\beta$-mixing process satisfying the central
  limit theorem but not the weak invariance principle

abstract:
  In 1983, N. Herrndorf proved that for a $\phi$-mixing sequence satisfying the
central limit theorem and $\liminf_{n\to\infty}\frac{\sigma^2_n}n>0$, the weak
invariance principle takes place. The question whether for strictly stationary
sequences with finite second moments and a weaker type ($\alpha$, $\beta$,
$\rho$) of mixing the central limit theorem implies the weak invariance
principle remained open.
  We construct a strictly stationary $\beta$-mixing sequence with finite
moments of any order and linear variance for which the central limit theorem
takes place but not the weak invariance principle.


title:
Measurement of the top-quark pair production cross-section in events
  with two leptons and bottom-quark jets using the full CDF data set

abstract:
  We present a measurement of the top-quark pair production cross-section in
proton-antiproton collisions at $\sqrt{s}$=1.96 TeV. The data were collected at
the Fermilab Tevatron by the CDF II detector and correspond to an integrated
luminosity of 8.8 fb$^{-1}$, representing the complete CDF Run II data set. We
select events consistent with the production of top-quark pairs by requiring
the presence of two reconstructed leptons, an imbalance in the total event
transverse momentum, and jets. At least one jet is required to be identified as
consistent with the fragmentation of a bottom quark using a
secondary-vertex-finding algorithm. The 246 candidate events are estimated to
have a signal purity of 91%. We measure a cross section of $\sigma_{\ttbar}$ =
7.09 $\pm$ 0.84 pb, assuming a top-quark mass of 172.5 GeV/$c^{2}$. The results
are consistent with the standard model as predicted by next-to-leading-order
calculations.


title: Nonlinear waves in a positive-negative coupled waveguide zigzag array

abstract:
  We consider the coupled electromagnetic waves propagating in a waveguide
array, which consists of alternating waveguides of positive and negative
refraction indexes. Due to zigzag configuration there are interactions between
both nearest and next nearest neighboring waveguides exist. It is shown that
there is a stop band in the spectrum of linear waves. The system of evolution
equations for coupled waves has the steady state solution describing the
electromagnetic pulse running in the array. Numerical simulation demonstrates
robustness of these solitary waves.


title: Tropical Convexity and Canonical Projections

abstract:
  Using a potential theory on metric graphs "Gamma", we introduce the notion of
tropical convexity to the space "RDiv^d(Gamma)" of effective R-divisors of
degree d on "Gamma" and show that a natural metric can be defined on
"RDiv^d(Gamma)". In addition, we extend the notion of reduced divisors which is
conventionally defined in a complete linear system |D| with respect to a single
point in "Gamma". In our general setting, a reduced divisor is defined uniquely
as an R-divisor in a compact tropical convex subset "T" of "RDiv^d(Gamma)" with
respect to a certain R-divisor "E" of the same degree d. In this sense, we
consider reduced divisors as canonical projections onto "T". We also
investigate some basic properties of tropical convex sets using techniques
developed from general reduced divisors.


title: Structural Analysis of Combustion Mechanisms

abstract:
  39 detailed mechanisms for combustion of hydrogen, carbon monoxide and
methanol are investigated using ReactionKinetics, a Mathematica based package.
The obtained results in most cases do not depend on the choice of reaction rate
coefficients, the methods only use the underlying sets of reaction steps, thus
the results are robust and general in a certain sense. These investigations can
be used before or in parallel with usual numerical investigations, such as
pathway analysis, sensitivity analysis, parameter estimation or simulation.
  The considered hydrogen mechanisms shared 90% of common reaction steps. The
CO combustion mechanisms show a larger variety both in species and in reaction
steps. There exist only a few methanol combustion mechanisms; the big
differences between them shows that the modelling community is only at the very
beginning of exploring this process.
  The package and the methods may be useful for automatic mechanism
generations, testing, comparing and reduction of mechanisms as well, especially
in the case of large systems.


title:
Analysis of the convergence rate for the cyclic projection algorithm
  applied to basic semi-algebraic convex sets

abstract:
  In this paper, we study the rate of convergence of the cyclic projection
algorithm applied to finitely many basic semi-algebraic convex sets. We
establish an explicit convergence rate estimate which relies on the maximum
degree of the polynomials that generate the basic semi-algebraic convex sets
and the dimension of the underlying space. We achieve our results by exploiting
the algebraic structure of the basic semi-algebraic convex sets.


title:
Performance of a Multiple-Access DCSK-CC System over Nakagami-$m$ Fading
  Channels

abstract:
  In this paper, we propose a novel cooperative scheme to enhance the
performance of multiple-access (MA) differential-chaos-shift-keying (DCSK)
systems. We provide the bit-error-rate (BER) performance and throughput
analyses for the new system with a decode-and-forward (DF) protocol over
Nakagami-$m$ fading channels. Our simulated results not only show that this
system significantly improves the BER performance as compared to the existing
DCSK non-cooperative (DCSK-NC) system and the multiple-input multiple-output
DCSK (MIMO-DCSK) system, but also verify the theoretical analyses. Furthermore,
we show that the throughput of this system approximately equals that of the
DCSK-NC system, both of which have prominent improvements over the MIMO-DCSK
system. We thus believe that the proposed system can be a good framework for
chaos-modulation-based wireless communications.


title:
Noetherian quotients of the algebra of partial difference polynomials
  and Grobner bases of symmetric ideals

abstract:
  In this paper we develop a Grobner bases theory for ideals of partial
difference polynomials with constant or non-constant coefficients. In
particular, we introduce a criterion providing the finiteness of such bases
when a difference ideal contains elements with suitable linear leading
monomials. This can be explained in terms of Noetherianity of the corresponding
quotient algebra. Among these Noetherian quotients we find finitely generated
polynomial algebras where the action of suitable finite dimensional commutative
algebras and in particular finite abelian groups is defined. We obtain
therefore a consistent Grobner bases theory for ideals that possess such
symmetries.


title: Can electrostatic field lift spin degeneracy?

abstract:
  There are two well known mechanisms which lead to lifting of energy spin
degeneracy of single electron systems - magnetic field and spin-orbit coupling.
We investigate the possibility for existence of a third mechanism in which
electrostatic field can lead to lifting of spin-degeneracy directly without the
mediation of spin-orbit coupling. A novel argument is provided for the need of
spin-orbit coupling different from the usual relativistic considerations. It is
shown that due to preserved translational invariance spin splitting purely by
electrostatic field is not possible for Bloch states. A possible lifting of
spin degeneracy by electrostatic field characterized by broken inversion and
translational invariance is considered.


title:
A new rare type of supernovae: hypervelocity stellar collisions at
  galactic centers

abstract:
  When a binary star system is tidally disrupted by a supermassive black hole
at a galactic nucleus, one star is ejected at a high speed while the other
remains in a tightly bound orbit around the black hole. The cluster of tightly
bound stars builds over time, eventually creating a steady state in which the
rate of collisions between these stars is similar to the rate of capturing new
stars. A large fraction of the collisions occur near the periapsis of the
orbits around the black hole, where the kinetic energies are sufficient to
generate an explosive disruption of the two stars involved. The typical flare
brightens for several days, with a peak luminosity that is comparable to the
lower-luminosity end of known supernovae. The explosion lightcurve is followed
by a longer flare due to accretion of ejected matter onto the black hole.
Dedicated searches in the near universe could observe several such
"collisional-supernovae" per year.


title:
SiGe Raman spectra vs. local clustering/anticlustering : Percolation
  scheme and ab initio calculations

abstract:
  We formalize within the percolation scheme, that operates along the linear
chain approximation, namely at one dimension (1D), an intrinsic ability behind
Raman scattering to achieve a quantitative insight into local clustering or
anticlustering in an alloy, using SiGe as a case study. For doing so, we derive
general expressions of the individual fractions of the six SiGe
percolation-type oscillators [1(Ge-Ge), 3(Si-Ge), 2(Si-Si)], which monitor
directly the Raman intensities, via a relevant order parameter k. This is
introduced by adapting to the 1D oscillators of the SiGe diamond version of the
1D percolation scheme, namely along a fully consistent 1D treatment, the
approach originally used by Verleur and Barker for the three-dimensional (3D)
oscillators of their 1D cluster scheme applying to zincblende alloys [H.W.
Verleur and A.S. Barker, Phys. Rev. 149, 715 (1966)], a somehow problematic one
in fact, due to its 3D vs. 1D ambivalence. Predictive k-dependent intensity
interplays between the SiGe (50 at.%Si) Raman lines are confronted with
existing experimental data and with ab initio Raman spectra obtained by using
large (32 atom) disordered supercells matching the required k values, with
special attention to the Si-Ge triplet and to the Si-Si doublet, respectively.


title:
Adaptive Mode Selection and Power Allocation in Bidirectional
  Buffer-aided Relay Networks

abstract:
  In this paper, we consider the problem of sum rate maximization in a
bidirectional relay network with fading. Hereby, user 1 and user 2 communicate
with each other only through a relay, i.e., a direct link between user 1 and
user 2 is not present. In this network, there exist six possible transmission
modes: four point-to-point modes (user 1-to-relay, user 2-to-relay,
relay-to-user 1, relay-to-user 2), a multiple access mode (both users to the
relay), and a broadcast mode (the relay to both users). Most existing protocols
assume a fixed schedule of using a subset of the aforementioned transmission
modes, as a result, the sum rate is limited by the capacity of the weakest link
associated with the relay in each time slot. Motivated by this limitation, we
develop a protocol which is not restricted to adhere to a predefined schedule
for using the transmission modes. Therefore, all transmission modes of the
bidirectional relay network can be used adaptively based on the instantaneous
channel state information (CSI) of the involved links. To this end, the relay
has to be equipped with two buffers for the storage of the information received
from users 1 and 2, respectively. For the considered network, given a total
average power budget for all nodes, we jointly optimize the transmission mode
selection and power allocation based on the instantaneous CSI in each time slot
for sum rate maximization. Simulation results show that the proposed protocol
outperforms existing protocols for all signal-to-noise ratios (SNRs).
Specifically, we obtain a considerable gain at low SNRs due to the adaptive
power allocation and at high SNRs due to the adaptive mode selection.


title: Collision of water wave solitons

abstract:
  A classification of the time evolution of the two-soliton solutions of the
Boussinesq equation is given, based on the number of extrema of the wave. For
solitons moving in the same directions, three different scenarios are found,
while it is shown that only one of these scenarios exists in case of oppositely
moving solitons.


title:
Calculating the normalising constant of the Bingham distribution on the
  sphere using the holonomic gradient method

abstract:
  In this paper we implement the holonomic gradient method to exactly compute
the normalising constant of Bingham distributions. This idea is originally
applied for general Fisher-Bingham distributions in Nakayama et al. (2011). In
this paper we explicitly apply this algorithm to show the exact calculation of
the normalising constant; derive explicitly the Pfaffian system for this
parametric case; implement the general approach for the maximum likelihood
solution search and finally adjust the method for degenerate cases, namely when
the parameter values have multiplicities.


title:
Masses of mesons with charm valence quarks from 2+1+1 flavor twisted
  mass lattice QCD

abstract:
  We present preliminary results of an ongoing lattice QCD computation of the
spectrum of $D$ mesons and $D_s$ mesons and of charmonium using 2+1+1 flavors
of twisted mass sea and valence quarks.


title:
The role of vector-baryon channels and resonances in the $\gamma p \to
  K^0 \Sigma^+$ and $\gamma n \to K^0 \Sigma^0$ reactions near the $K^*
  \Lambda$ threshold

abstract:
  We have studied the $\gamma p \to K^0 \Sigma^+$ reaction in the energy region
around the $K^* \Lambda$ and $K^* \Sigma$ thresholds, where the CBELSA/TAPS
cross section shows a sudden drop and the differential cross section
experiences a transition from a forward-peaked distribution to a flat one. Our
coupled channel model incorporates the dynamics of the vector meson-baryon
interaction which is obtained from the hidden gauge formalism. We find that the
cross section in this energy region results from a delicate interference
between amplitudes having $K^* \Lambda$ and $K^*\Sigma$ intermediate states.
The sharp downfall is dictated by the presence of a nearby $N^*$ resonance
produced by our model, a feature that we have employed to predict its
properties. We also show results for the complementary $\gamma n \to K^0
\Sigma^0$ reaction, the measurement of which would test the mechanism proposed
in this work.


title: Is magnetic chiral dichroism feasible with electron vortices?

abstract:
  We discuss the feasibility of detecting magnetic transitions with focused
electron vortex probes, suggested by selection rules for the magnetic quantum
number. We theoretically estimate the dichroic signal strength in the L$_{2,3}$
edge of the ferromagnetic d metals. It is shown that under realistic
conditions, the dichroic signal is undetectable for nanoparticles larger than
~1 nm. This is confirmed by a key experiment with nanometer sized vortices.


title:
Photometry of the eclipsing cataclysmic variable SDSS
  J152419.33+220920.0

abstract:
  Aims. We present new photometry of the faint and poorly studied cataclysmic
variable SDSS J152419.33+220920.0, analyze its light curve and provide an
accurate ephemeris for this system. Methods. Time-resolved CCD differential
photometry was carried out using the 1.5m and 0.84m telescopes at the
Observatorio Astronomico Nacional at San Pedro Martir. Results. From
time-resolved photometry of the system obtained during six nights (covering
more than twenty primary eclipse cycles in more than three years), we show that
this binary presents a strong primary and a weak secondary modulation. Our
light curve analysis shows that only two fundamental frequencies are present,
corresponding to the orbital period and a modulation with twice this frequency.
We determine the accurate ephemeris of the system to be HJD(eclipse)=
2454967.6750(1) + 0.06531866661(1) E. A double-hump orbital period modulation,
a standing feature in several bounce-back systems at quiescence, is present at
several epochs. However, we found no other evidence to support the hypothesis
that this system belongs to the post-minimum orbital-period systems.


title: Algebraic Bethe ansatz for singular solutions

abstract:
  The Bethe equations for the isotropic periodic spin-1/2 Heisenberg chain with
N sites have solutions containing i/2, -i/2 that are singular: both the
corresponding energy and the algebraic Bethe ansatz vector are divergent. Such
solutions must be carefully regularized. We consider a regularization involving
a parameter that can be determined using a generalization of the Bethe
equations. These generalized Bethe equations provide a practical way of
determining which singular solutions correspond to eigenvectors of the model.


title: Growth of Primitive Elements in Free Groups

abstract:
  In the free group $F_k$, an element is said to be primitive if it belongs to
a free generating set. In this paper, we describe what a generic primitive
element looks like. We prove that up to conjugation, a random primitive word of
length $N$ contains one of the letters exactly once asymptotically almost
surely (as $N \to \infty$).
  This also solves a question from the list `Open problems in combinatorial
group theory' [Baumslag-Myasnikov-Shpilrain 02']. Let $p_{k,N}$ be the number
of primitive words of length $N$ in $F_k$. We show that for $k \ge 3$, the
exponential growth rate of $p_{k,N}$ is $2k-3$. Our proof also works for giving
the exact growth rate of the larger class of elements belonging to a proper
free factor.


title:
Trapping of 85Rb atoms by optical pumping between metastable hyperfine
  states

abstract:
  We describe an atom trapping mechanism based upon differential optical
pumping between metastable hyperfine states by partially-displaced laser beams
in the absence of a magnetic field. With realistic laser powers, trap spring
constants should match or exceed those typical of magneto-optical traps, and
highly flexible tailored trap shapes should be achievable. In a
proof-of-principle experiment, we have combined a 1D implementation with
magneto-optical trapping in the orthogonal directions, capturing ~10000 85Rb
atoms.
  This is an author-created, un-copyedited version of an article published in
J. Phys. B: At. Mol. Opt. Phys. IOP Publishing Ltd is not responsible for any
errors or omissions in this version of the manuscript or any version derived
from it. The Version of Record is available online at
http://iopscience.iop.org/0953-4075/46/21/215003/article.


title: Generalized Canonical Correlation Analysis for Classification

abstract:
  For multiple multivariate data sets, we derive conditions under which
Generalized Canonical Correlation Analysis (GCCA) improves classification
performance of the projected datasets, compared to standard Canonical
Correlation Analysis (CCA) using only two data sets. We illustrate our
theoretical results with simulations and a real data experiment.


title:
Painleve Test and the Resolution of Singularities for Integrable
  Equations

abstract:
  We prove that under a very general setting, a system of ODE passes the
Painleve test if and only if there is a good change of variable, such that the
pole singularity solutions are converted to regular power series, while the
converted ODE system is still kept regular. A consequence is that all principal
balances of an ODE system converge. We also prove that the results are natural
with respect to Hamiltonian systems.


title:
Properties of the most metal-poor gas-rich LSB dwarf galaxies SDSS
  J0015+0104 and J2354-0005 residing in the Eridanus void

abstract:
  SDSS J0015+0104 is the lowest metallicity low surface brightness dwarf (LSBD)
galaxy known. The oxygen abundance in its HII region SDSS J001520.70+010436.9
(at ~1.5 kpc from the galaxy centre) is 12+log(O/H)=7.07 (Guseva et al.). This
galaxy, at the distance of 28.4 Mpc, appears to reside deeply in the volume
devoid of luminous massive galaxies, known as the Eridanus void. SDSS
J235437.29-000501.6 is another Eridanus void LSBD galaxy, with parameter
12+log(O/H)=7.36 (also Guseva et al.). We present the results of their HI
observations with the Nancay Radio Telescope revealing their high ratios of
M(HI)/L_B ~2.3. Based on the Sloan Digital Sky Survey images, we derived for
both galaxies their radial surface brightness profiles and the main photometric
parameters. Their colours and total magnitudes are used to estimate the galaxy
stellar mass and ages. The related gas mass-fractions, f_g ~0.98 and ~0.97, and
the extremely low metallicities (much lower than for their more typical
counterparts with the same luminosity) indicate their unevolved status. We
compare these Eridanus void LSBDs with several extreme LSBD galaxies residing
in the nearby Lynx-Cancer void. Based on the combination of all their unusual
properties, the two discussed LSBD galaxies are similar to the unusual LSBDs
residing in the closer void. This finding presents additional evidence for the
existence in voids of a4 figures, sizable fraction of low-mass unevolved
galaxies. Their dedicated search might result in the substantial increase of
the number of such objects in the local Universe and in the advancement of
understanding their nature.


title: GeoDBLP: Geo-Tagging DBLP for Mining the Sociology of Computer Science

abstract:
  Many collective human activities have been shown to exhibit universal
patterns. However, the possibility of universal patterns across timing events
of researcher migration has barely been explored at global scale. Here, we show
that timing events of migration within different countries exhibit remarkable
similarities. Specifically, we look at the distribution governing the data of
researcher migration inferred from the web. Compiling the data in itself
represents a significant advance in the field of quantitative analysis of
migration patterns. Official and commercial records are often access
restricted, incompatible between countries, and especially not registered
across researchers. Instead, we introduce GeoDBLP where we propagate
geographical seed locations retrieved from the web across the DBLP database of
1,080,958 authors and 1,894,758 papers. But perhaps more important is that we
are able to find statistical patterns and create models that explain the
migration of researchers. For instance, we show that the science job market can
be treated as a Poisson process with individual propensities to migrate
following a log-normal distribution over the researcher's career stage. That
is, although jobs enter the market constantly, researchers are generally not
"memoryless" but have to care greatly about their next move. The propensity to
make k>1 migrations, however, follows a gamma distribution suggesting that
migration at later career stages is "memoryless". This aligns well but actually
goes beyond scientometric models typically postulated based on small case
studies. On a very large, transnational scale, we establish the first general
regularities that should have major implications on strategies for education
and research worldwide.


title:
Some Results on Mutual Information of Disjoint Regions in Higher
  Dimensions

abstract:
  We consider the mutual Renyi information I^n(A,B)=S^n_A+S^n_B-S^n_{AUB} of
disjoint compact spatial regions A and B in the ground state of a
d+1-dimensional conformal field theory (CFT), in the limit when the separation
r between A and B is much greater than their sizes R_{A,B}. We show that in
general I^n(A,B)\sim C^n_AC^n_B(R_AR_B/r^2)^a, where a the smallest sum of the
scaling dimensions of operators whose product has the quantum numbers of the
vacuum, and the constants C^n_{A,B} depend only on the shape of the regions and
universal data of the CFT.
  For a free massless scalar field, where 2x=d-1, we show that C^2_AR_A^{d-1}
is proportional to the capacitance of a thin conducting slab in the shape of A
in d+1-dimensional electrostatics, and give explicit formulae for this when A
is the interior of a sphere S^{d-1} or an ellipsoid. For spherical regions in
d=2 and 3 we obtain explicit results for C^n for all n and hence for the
leading term in the mutual information by taking n->1. We also compute a
universal logarithmic correction to the area law for the Renyi entropies of a
single spherical region for a scalar field theory with a small mass.


title:
Constraining the distribution of dark matter in inner galaxy with
  indirect detection signal: The case of tentative 130 gev {\gamma}-ray line

abstract:
  The dark matter distribution in the very inner region of our Galaxy is still
in debate. In the N-body simulations a cuspy dark matter halo density profile
is favored. Several dissipative baryonic processes however are found to be able
to significantly flatten dark matter distribution and a cored dark matter halo
density profile is possible. The baryons dominate the gravitational potential
in the inner Galaxy, hence a direct constrain on the abundance of the dark
matter particles is rather challenging. Recently, a few groups have identified
a tentative 130 GeV line signal in the Galactic center, which could be
interpreted as the signal of the dark matter annihilation. With current 130 GeV
line data and adopting the generalized Navarro-Frenk-White profile of the dark
matter halo, for local dark matter density \rho_0=0.4 GeV cm^{-3} and r_s=20
kpc we obtain a 95% confidence level lower (upper) limit on the inner slope of
dark matter density distribution \alpha = 1.06 (the cross section of dark
matter annihilation into gamma-rays <\sigma v >_{\chi\chi -> \gamma\gamma}=
1.3\times 10^{-27} cm^3 s^{-1}). Such a slope is consistent with the results of
some N-body simulations, and if the signal is due to dark matter, suggests that
baryonic processes may be unimportant.


title: Moduli-Induced Axion Problem

abstract:
  We point out that the cosmological moduli problem is not necessarily resolved
even if the modulus mass is heavier than O(10)TeV, contrary to the common
wisdom. The point is that, in many scenarios where the lightest moduli fields
are stabilized by supersymmetry breaking effects, those moduli fields tend to
mainly decay into almost massless axions, whose abundance is tightly
constrained by the recent Planck results. We study the moduli-induced axion
problem in concrete examples, and discuss possible solutions. The problem and
its solutions are widely applicable to decays of heavy scalar fields which
dominate the energy density of the Universe, for instance, the reheating of the
inflaton.


title: On Higher Spin Symmetries in AdS_{5}

abstract:
  A special embedding of the SU(4) algebra in SU(10), including both spin two
and spin three symmetry generators, is constructed. A possible five dimensional
action for massless spin two and three fields with cubic interaction is
constructed. The connection with the previously investigated higher spin
theories in $AdS_{5}$ background is discussed. Generalization to the more
general case of symmetries, including spins $2,3,\dots s$, is shown.


title:
A comparative study on bulk and nanoconfined water by time-resolved
  optical Kerr effect spectroscopy

abstract:
  The low frequency vibrational spectra of hydrated porous silica are
specifically sensitive to the hydrogen bond interactions and provides a wealth
of information on the structural and dynamical properties of the water
contained in the pores of the matrix. We investigate systematically this
spectral region of Vycor porous silica (pore size about 4 nm) for a series of
samples at different levels of hydration, from the dry matrix to completely
filled pores. The spectra are obtained as the Fourier transforms of
time-resolved heterodyne detected optical Kerr effect (HD- OKE) measurements.
The comparison of these spectra with that of bulk water allows us to extract
and analyze separately the spectral contributions of the first and second
hydration layers, as well as that of bulk-like inner water. We conclude that
the extra water entering the pores above 10 % water/silica weight ratio behaves
very similarly to bulk water. At lower levels of hydration, corresponding to
two complete superficial water layers or less, the H-bond bending and
stretching bands, characteristic of the tetrahedral coordination of water in
the bulk phase, progressively disappear: clearly in these conditions the H-bond
connectivity is very different from that of liquid water. A similar behavior is
observed for the structural relaxation times, measured from the decay of the
time-dependent HD-OKE signal. The value for the inner water is very similar to
that of the bulk liquid; that of the first two water layers is definitely
longer by about a factor 4. These findings should be carefully taken into
account when employing pore confinement to extend towards lower temperatures
the accessible temperature range of supercooled water.