title: Spatial Development of Energetic Particle Spectra in Pulsar Wind Nebulae

abstract:
  The evolution of the non-thermal emission emitted by pulsar wind nebulae is
generally calculated using spatially-independent particle transport models.
Although useful, these models implicitly assume that the source of non-thermal
particles is located uniformly throughout the system, contrary to the nature of
pulsar wind nebulae where the source is located at the centre of the system.
Additionally, it is not possible to take into account the spatial properties of
the magnetic field and flow velocity, or the effects of diffusion and gradient
and curvature drifts in these models. In this paper we present an extension to
the current nebula models by including a spatial dependence in our numerical
solutions of a Fokker-Planck particle transport equation. These solutions also
show the effect that the magnetic field structure has on the evolution of the
particle spectrum. Although applied within the context of pulsar wind nebulae,
the presented solutions are equally valid for any similar central source system
such as globular clusters.


title:
Numerical simulation of the localization of elastic waves in two- and
  three-dimensional heterogeneous media

abstract:
  Localization of elastic waves in two-dimensional (2D) and three-dimensional
(3D) media with random distributions of the Lam\'e coefficients (the shear and
bulk moduli) is studied, using extensive numerical simulations. We compute the
frequency-dependence of the minimum positive Lyapunov exponent $\gamma$ (the
inverse of the localization length) using the transfer-matrix method, the
density of states utilizing the force-oscillator method, and the energy-level
statistics of the media. The results indicate that all the states may be
localized in the 2D media, up to the disorder width and the smallest
frequencies considered, although the numerical results also hint at the
possibility that there might a small range of the allowed frequencies over
which a mobility edge might exist. In the 3D media, however, most of the states
are extended, with only a small part of the spectrum in the upper band tail
that contains localized states, even if the Lam\'e coefficients are randomly
distributed. Thus, the 3D heterogeneous media still possess a mobility edge. If
both Lam\'e coefficients vary spatially in the 3D medium, the localization
length $\Lambda$ follows a power law near the mobility edge,
$\Lambda\sim(\Omega-\Omega_c)^{-\nu}$, where $\Omega_c$ is the critical
frequency. The numerical simulation yields, $\nu \simeq 1.89\pm 0.17$,
significantly larger than the numerical estimate, $\nu\simeq 1.57\pm 0.01$, and
$\nu=3/2$, which was recently derived by a semiclassical theory for the 3D
Anderson model of electron localization...


title:
Comparing the usage of global and local Wikipedias with focus on Swedish
  Wikipedia

abstract:
  This report summarizes the results of a short-term student research project
focused on the usage of Swedish Wikipedia. It is trying to answer the following
question: To what extent (and why) do people from non-English language
communities use the English Wikipedia instead of the one in their local
language? Article access time series and article edit time series from major
Wikipedias including Swedish Wikipedia are analyzed with various tools.


title: Back-scatter based whispering gallery mode sensing

abstract:
  Whispering gallery mode biosensors allow selective unlabelled detection of
single proteins and, combined with quantum limited sensitivity, the possibility
for noninvasive realtime observation of motor molecule motion. However, to date
technical noise sources, most particularly low frequency laser noise, have
constrained such applications. Here we introduce a new technique for whispering
gallery mode sensing based on direct detection of back-scattered light. This
experimentally straightforward technique is immune to frequency noise in
principle, and further, acts to suppress thermorefractive noise. We demonstrate
27 dB of frequency noise suppression, eliminating frequency noise as a source
of sensitivity degradation and allowing an absolute frequency shift sensitivity
of 76 kHz. Our results open a new pathway towards single molecule biophysics
experiments and ultrasensitive biosensors.

categories: physics.optics physics.bio-ph physics.ins-det quant-ph


title:
Dynamic renormalization group analysis of propagation of elastic waves
  in two-dimensional heterogeneous media

abstract:
  We study localization of elastic waves in two-dimensional heterogeneous
solids with randomly distributed Lam\'e coefficients, as well as those with
long-range correlations with a power-law correlation function. The
Matin-Siggia-Rose method is used, and the one-loop renormalization group (RG)
equations for the the coupling constants are derived in the limit of long
wavelengths. The various phases of the coupling constants space, which depend
on the value $\rho$, the exponent that characterizes the power-law correlation
function, are determined and described. Qualitatively different behaviors
emerge for $\rho<1$ and $\rho>1$. The Gaussian fixed point (FP) is stable
(unstable) for $\rho<1$ ($\rho>1$). For $\rho<1$ there is a region of the
coupling constants space in which the RG flows are toward the Gaussian FP,
implying that the disorder is irrelevant and the waves are delocalized. In the
rest of the disorder space the elastic waves are localized. We compare the
results with those obtained previously for acoustic wave propagation in the
same type of heterogeneous media, and describe the similarities and differences
between the two phenomena.


title:
Proving soundness of combinatorial Vickrey auctions and generating
  verified executable code

abstract:
  Using mechanised reasoning we prove that combinatorial Vickrey auctions are
soundly specified in that they associate a unique outcome (allocation and
transfers) to any valid input (bids). Having done so, we auto-generate verified
executable code from the formally defined auction. This removes a source of
error in implementing the auction design. We intend to use formal methods to
verify new auction designs. Here, our contribution is to introduce and
demonstrate the use of formal methods for auction verification in the familiar
setting of a well-known auction.


title: Proof-Pattern Recognition and Lemma Discovery in ACL2

abstract:
  We present a novel technique for combining statistical machine learning for
proof-pattern recognition with symbolic methods for lemma discovery. The
resulting tool, ACL2(ml), gathers proof statistics and uses statistical
pattern-recognition to pre-processes data from libraries, and then suggests
auxiliary lemmas in new proofs by analogy with already seen examples. This
paper presents the implementation of ACL2(ml) alongside theoretical
descriptions of the proof-pattern recognition and lemma discovery methods
involved in it.


title: On the theory of coconvex bodies

abstract:
  If the complement of a closed convex set in a closed convex cone is bounded,
then this complement minus the apex of the cone is called a coconvex set.
Coconvex sets appear in singularity theory (they are closely related to Newton
diagrams) and in commutative algebra. Such invariants of coconvex sets as
volumes, mixed volumes, number of integer points, etc., play an important role.
This paper aims at extending various results from the theory of convex bodies
to the coconvex setting. These include the Aleksandrov-Fenchel inequality and
the Ehrhart duality.


title:
Constraining dark matter capture and annihilation cross sections by
  searching for neutrino signature from the Earth core

abstract:
  We study the sensitivity of IceCube/DeepCore detector to dark matter
annihilations in the Earth core. We focus on annihilation modes $\chi\chi\to
\nu \bar{\nu}, \, \tau^+ \tau^-, \, b \bar{b}$, and $W^+W^-$. Both track and
cascade events are considered in our analysis. By fixing the dark matter
annihilation cross section $\langle \sigma\upsilon\rangle$ at some nominal
values, we study the sensitivity of IceCube/DeepCore detector to dark matter
spin-independent cross section $\sigma_p^{\rm SI}$ for $m_{\chi}$ ranging from
few tens of GeV to 10 TeV. This sensitivity is compared with the existing
IceCube 79-string constraint on the same cross section, which was obtained by
searching for dark matter annihilations in the Sun. We compare this sensitivity
to dark matter direct detection results as well, in particular the XENON100
(2012) limit and the parameter regions preferred by DAMA and CRESST-II
experiments. We also present IceCube/DeepCore sensitivity to $\langle
\sigma\upsilon \rangle$ as a function of $m_{\chi}$ by fixing $\sigma_p^{\rm
SI}$ at XENON100 (2012) and XENON1T limits, respectively. This sensitivity is
compared with the preferred dark matter parameter range derived from the
combined fitting to PAMELA and AMS02 positron fraction data. We conclude that
the search for dark matter annihilations in the Earth core provides competitive
constraints on $\sigma_p^{\rm SI}$ and $\langle \sigma\upsilon \rangle$ in the
case of low-mass dark matter. Particularly, the expected constraint on
$\sigsip$ for 5 years of data taking in IceCube/DeepCore is more stringent than
the current IceCube 79-string limit mentioned above.


title:
Experimental Search for the Singlet Metastable Deuteron in the Radiative
  n-p Capture

abstract:
  We performed an experimental search for the bound state singlet deuteron
predicted in some microscopic calculations. The experiment consists in a high
statistics measurement of gamma ray spectra after thermal neutron capture by
hydrogen nuclei. The upper limit is obtained for the probability of the
  3S1 - 1S0 -transition population of the deuteron singlet bound state with the
bound energy in the interval 25-125 keV.


title:
Model for quantitative tip-enhanced spectroscopy and the extraction of
  nanoscale-resolved optical constants

abstract:
  Near-field infrared spectroscopy by elastic scattering of light from a probe
tip resolves optical contrasts in materials at dramatically sub-wavelength
scales across a broad energy range, with the demonstrated capacity for chemical
identification at the nanoscale. However, current models of probe-sample
near-field interactions still cannot provide a sufficiently quantitatively
interpretation of measured near-field contrasts, especially in the case of
materials supporting strong surface phonons. We present a model of near-field
spectroscopy derived from basic principles and verified by finite-element
simulations, demonstrating superb predictive agreement both with tunable
quantum cascade laser near-field spectroscopy of SiO$_2$ thin films and with
newly presented nanoscale Fourier transform infrared (nanoFTIR) spectroscopy of
crystalline SiC. We discuss the role of probe geometry, field retardation, and
surface mode dispersion in shaping the measured near-field response. This
treatment enables a route to quantitatively determine nano-resolved optical
constants, as we demonstrate by inverting newly presented nanoFTIR spectra of
an SiO$_2$ thin film into the frequency dependent dielectric function of its
mid-infrared optical phonon. Our formalism further enables tip-enhanced
spectroscopy as a potent diagnostic tool for quantitative nano-scale
spectroscopy.


title: The Legacy of Ken Wilson

abstract:
  This is a brief account of the legacy of Ken Wilson in statistical physics,
high energy physics, computing and education.


title: Evidence for structural crossover in the supercritical state

abstract:
  The state of matter above the critical point is terra incognita, and is
loosely discussed as a physically homogeneous flowing state where no
differences can be made between a liquid and a gas and where properties undergo
no marked or distinct changes with pressure and temperature. In particular, the
structure of supercritical state is currently viewed to be the same everywhere
on the phase diagram, and to change only gradually and in a featureless way
while moving along any temperature and pressure path above the critical point.
Here, we demonstrate that this is not the case, but that there is a
well-defined structural crossover instead. Evidenced by the qualitative changes
of distribution functions of interatomic distances and angles, the crossover
demarcates liquid-like and gas-like configurations and the presence of
medium-range structural correlations. Importantly, the discovered structural
crossover is closely related to both dynamic and thermodynamic crossovers
operating in the supercritical state, providing new unexpected fundamental
interlinks between the supercritical structure, dynamics and thermodynamics.


title:
Finite frequency external cloaking with complementary bianisotropic
  media

abstract:
  We investigate the twofold functionality of a cylindrical shell consisting of
a negatively refracting heterogeneous bianisotropic (NRHB) medium deduced from
geometric transforms. The numerical simulations indicate that the shell
enhances their scattering by a perfect electric conducting (PEC) core, whereas
it considerably reduces the scattering of electromagnetic waves by closely
located dipoles when the shell surrounds a bianisotropic core. The former can
be attributed to a homeopathic effect, whereby a small PEC object scatters like
a large one as confirmed by numerics, while the latter can be attributed to
space cancelation of complementary bianisotropic media underpinning anomalous
resonances counteracting the field emitted by small objects (external
cloaking). Space cancellation is further used to cloak a NRHB finite size
object located nearby a slab of NRHB with a hole of same shape and opposite
refracting index. Such a finite frequency external cloaking is also achieved
with a NRHB cylindrical lens. Finally, we investigate an ostrich effect whereby
the scattering of NRHB slab and cylindrical lenses with simplified parameters
hide the presence of dipoles in the quasi-static limit.


title:
Solving Hodgkin-Huxley equations using the compact difference scheme
  -tapering dendrite

abstract:
  Dendritic processing is now considered to be important in pre-processing of
signals coming into a cell. Dendrites are involved in both propagation and
backpropagation of signals. In a cylindrical dendrite, signals moving in either
direction will be similar. However, if the dendrites taper, then this is not
the case any more. The picture gets more complex if the ion channel
distribution along the dendrite is also non-uniform. These equations have been
solved using the Chebyshev pseudo-spectral method. Here we look at non-uniform
dendritic voltage gated channels in both cylindrical and tapering dendrites.
For back-propagating signals, the signal is accentuated in the case of tapering
dendrites. We assume a Hodgkin-Huxley formulation of ion channels and solve
these equations with the compact finite-difference scheme. The scheme gives
spectral-like spatial resolution while being easier to solve than spectral
methods. We show that the scheme is able to reproduce the results obtained from
spectral methods. The compact difference scheme is widely used to study
turbulence in airflow, however it is being used for the first time in our
laboratory to solve the equations involving transmission of signals in the
brain.


title:
Approaches to Derivation of the Boltzmann Equation with Hard Sphere
  Collisions

abstract:
  In the paper the possible approaches to the rigorous derivation of the
Boltzmann kinetic equation with hard sphere collisions from underlying dynamics
are considered. In particular, a formalism for the description of the evolution
of infinitely many hard spheres within the framework of marginal observables in
the Boltzmann--Grad scaling limit is developed. Also we give consideration to
one more approach of the description of the kinetic evolution of hard spheres
in terms of a one-particle distribution function governed by the non-Markovian
generalization of the Enskog equation and the Boltzmann--Grad asymptotic
behavior of its non-perturbative solution is established.

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


title: A note on gl_N type-I integrable defects

abstract:
  Type-I quantum defects are considered in the context of the gl_N spin chain.
The type-I defects are associated to the generalized harmonic oscillator
algebra, and the chosen defect matrix is the one of the vector non-linear
Schrodinger (NLS) model. The transmission matrices relevant to this particular
type of defects are computed via the Bethe ansatz methodology.


title: Planet formation in evolving protoplanetary discs

abstract:
  I attempt to summarize our knowledge of planet formation in evolving
protoplanetary discs. I first review the physics of disc evolution and
dispersal. For most of the disc lifetime evolution is driven by accretion and
photoevaporation, and I discuss how the interplay between these processes
shapes protoplanetary discs. I also discuss the observations that we use to
test these models, and the major uncertainties that remain. I will then move on
to consider planet formation and migration in evolving discs, and discuss how
observations of both discs and planets can be used to inform our understanding
of protoplanetary disc evolution.


title:
OFF-Set: One-pass Factorization of Feature Sets for Online
  Recommendation in Persistent Cold Start Settings

abstract:
  One of the most challenging recommendation tasks is recommending to a new,
previously unseen user. This is known as the 'user cold start' problem.
Assuming certain features or attributes of users are known, one approach for
handling new users is to initially model them based on their features.
  Motivated by an ad targeting application, this paper describes an extreme
online recommendation setting where the cold start problem is perpetual. Every
user is encountered by the system just once, receives a recommendation, and
either consumes or ignores it, registering a binary reward.
  We introduce One-pass Factorization of Feature Sets, OFF-Set, a novel
recommendation algorithm based on Latent Factor analysis, which models users by
mapping their features to a latent space. Furthermore, OFF-Set is able to model
non-linear interactions between pairs of features. OFF-Set is designed for
purely online recommendation, performing lightweight updates of its model per
each recommendation-reward observation. We evaluate OFF-Set against several
state of the art baselines, and demonstrate its superiority on real
ad-targeting data.


title:
Fast and simple scheme for generating NOON states of photons in circuit
  QED

abstract:
  The generation, manipulation and fundamental understanding of entanglement
lies at very heart of quantum mechanics. Among various types of entangled
states, the NOON states are a kind of special quantum entangled states with two
orthogonal component states in maximal superposition, which have a wide range
of potential applications in quantum communication and quantum information
processing. Here, we propose a fast and simple scheme for generating NOON
states of photons in two superconducting resonators by using a single
superconducting transmon qutrit. Because only one superconducting qutrit and
two resonators are used, the experimental setup for this scheme is much
simplified when compared with the previous proposals requiring a setup of two
superconducting qutrits and three cavities. In addition, this scheme is easier
and faster to implement than the previous proposals, which require using a
complex microwave pulse, or a small pulse Rabi frequency in order to avoid
nonresonant transitions.


title:
Interpolation inequalities between Sobolev and Morrey-Campanato spaces:
  A common gateway to concentration-compactness and Gagliardo-Nirenberg
  interpolation inequalities

abstract:
  We prove interpolation estimates between Morrey-Campanato spaces and Sobolev
spaces. These estimates give in particular concentration-compactness
inequalities in the translation-invariant and in the translation- and
dilation-invariant case. They also give in particular interpolation estimates
between Sobolev spaces and functions of bounded mean oscillation. The proofs
rely on Sobolev integral representation formulae and maximal function theory.
Fractional Sobolev spaces are also covered.


title:
Measurement of the e+e- --> p anti-p cross section in the energy range
  from 3.0 to 6.5 GeV

abstract:
  The e+ e- --> p anti-p cross section and the proton magnetic form factor have
been measured in the center-of-mass energy range from 3.0 to 6.5 GeV using the
initial-state-radiation technique with an undetected photon. This is the first
measurement of the form factor at energies higher than 4.5 GeV. The analysis is
based on 469 fb-1 of integrated luminosity collected with the BABAR detector at
the PEP-II collider at e+e- center-of-mass energies near 10.6 GeV. The
branching fractions for the decays J/psi --> p anti-p and psi(2S) --> p anti-p
have also been measured.


title:
Euler approximations with varying coefficients: The case of
  superlinearly growing diffusion coefficients

abstract:
  A new class of explicit Euler schemes, which approximate stochastic
differential equations (SDEs) with superlinearly growing drift and diffusion
coefficients, is proposed in this article. It is shown, under very mild
conditions, that these explicit schemes converge in probability and in
$\mathcal{L}^p$ to the solution of the corresponding SDEs. Moreover, rate of
convergence estimates are provided for $\mathcal{L}^p$ and almost sure
convergence. In particular, the strong order $1/2$ is recovered in the case of
uniform $\mathcal{L}^p$-convergence.


title: Introduction to Management Information system

abstract:
  A Management Information System (MIS) is a systematic organization and
presentation of information that is generally required by the management of an
organization for taking better decisions for the organization. The MIS data may
be derived from various units of the organization or from other sources.
However it is very difficult to say the exact structure of MIS as the structure
and goals of different types of organizations are different. Hence both the
data and structure of MIS is dependent on the type of organization and often
customized to the specific requirement of the management.


title:
From Extended Gravity with Torsion-Spin Coupling to Running Constant for
  Weak-Leptonic Forces

abstract:
  In this paper we show how in the most natural extension of gravity with
torsion, fermion fields are endowed with running coupling in spinorial
interaction, that are shown to reproduce the strength and structure of the
leptonic weak forces.


title:
Coupling of exciton states as the origin of their biexponential decay
  dynamics in GaN nanowires

abstract:
  Using time-resolved photoluminescence spectroscopy, we explore the transient
behavior of bound and free excitons in GaN nanowire ensembles. We investigate
samples with distinct diameter distributions and show that the pronounced
biexponential decay of the donor-bound exciton observed in each case is not
caused by the nanowire surface. At long times, the individual exciton
transitions decay with a common lifetime, which suggests a strong coupling
between the corresponding exciton states. A system of non-linear rate-equations
taking into account this coupling directly reproduces the experimentally
observed biexponential decay.


title:
Orientation Sensitive Nonlinear Growth of Graphene: A
  Geometry-determined Epitaxial Growth Mechanism

abstract:
  Although the corresponding carbon-metal interactions can be very different, a
similar nonlinear growth behavior of graphene has been observed for different
metal substrates. To understand this interesting experimental observation, a
multiscale $\lq\lq$standing-on-the-front" kinetic Monte Carlo study is
performed. An extraordinary robust geometry effect is identified, which solely
determines the growth kinetics and makes the details of carbon-metal
interaction not relevant at all. Based on such a geometry-determined mechanism,
epitaxial growth behavior of graphene can be easily predicted in many cases. As
an example, an orientation-sensitive growth kinetics of graphene on Ir(111)
surface has been studied. Our results demonstrate that lattice mismatch pattern
at the atomic level plays an important role for macroscopic epitaxial growth.


title: Satellite image classification methods and Landsat 5TM bands

abstract:
  This paper attempts to find the most accurate classification method among
parallelepiped, minimum distance and chain methods. Moreover, this study also
challenges to find the suitable combination of bands, which can lead to better
results in case combinations of bands occur. After comparing these three
methods, the chain method over perform the other methods with 79% overall
accuracy. Hence, it is more accurate than minimum distance with 67% and
parallelepiped with 65%. On the other hand, based on bands features, and also
by combining several researchers' findings, a table was created which includes
the main objects on the land and the suitable combination of the bands for
accurately detecting of landcover objects. During this process, it was observed
that band 4 (out of 7 bands of Landsat 5TM) is the band, which can be used for
increasing the accuracy of the combined bands in detecting objects on the land.


abstract:
  The aim of edge editing or modification problems is to change a given graph
by adding and deleting of a small number of edges in order to satisfy a certain
property. We consider the Edge Editing to a Connected Graph of Given Degrees
problem that asks for a graph G, non-negative integers d,k and a function
\delta:V(G)->{1,...,d}, whether it is possible to obtain a connected graph G'
from G such that the degree of v is \delta(v) for any vertex v by at most k
edge editing operations. As the problem is NP-complete even if \delta(v)=2, we
are interested in the parameterized complexity and show that Edge Editing to a
Connected Graph of Given Degrees admits a polynomial kernel when parameterized
by d+k. For the special case \delta(v)=d, i.e., when the aim is to obtain a
connected d-regular graph, the problem is shown to be fixed parameter tractable
when parameterized by k only.


title:
Quantum disorder and local modes of the fully-frustrated transverse
  field Ising model on a diamond chain

abstract:
  We investigate the transverse field Ising model on a diamond chain using
series expansions about the high-field limit
  and exact diagonalizations. For the unfrustrated case we accurately determine
the quantum critical point and its expected 2d Ising universality separating
the polarized and the Z2 symmetry broken phase. In contrast, we find strong
evidences for a disorder by disorder scenario for the fully-frustrated
transverse field Ising model, i.e. except for the pure Ising model, having an
extensive number of ground states, the system is always in a quantum disordered
polarized phase. The low-energy excitations in this polarized phase are
understood in terms of exact local modes of the model. Furthermore, an
effective low-energy description for an infinitesimal transverse field allows
to pinpoint the quantum disordered nature of the ground state via mapping to an
effective transverse field Ising chain and to determine the induced gap to the
elementary effective domain wall excitation very accurately.


title: Derived equivalences induced by big cotilting modules

abstract:
  We prove that given a Grothendieck category G with a tilting object of finite
projective dimension, the induced triangle equivalence sends an injective
cogenerator of G to a big cotilting module. Moreover, every big cotilting
module can be constructed like that in an essentially unique way. We also prove
that the triangle equivalence is at the base of an equivalence of derivators,
which in turn is induced by a Quillen equivalence with respect to suitable
abelian model structures on the corresponding categories of complexes.


title:
Variability of the Spin Period of the White Dwarf in the Magnetic
  Cataclysmic Binary System EX Hya

abstract:
  The observations of the two-periodic magnetic cataclysmic system EX Hya have
been carried out, using the telescopes RC16 and TOA-150 of the Tzec Maun
observatory. 6 nights of observations were obtained in 2010-2011 (alternatively
changing filters VR). Also the databases of WASP, ASAS and AAVSO have been
analyzed. Processing time series was carried out using the program MCV. We
analyzed changes in the rotation period of the white dwarf, and based on our
own and previously published moments of maximum. The ephemeris was determined
for the maxima of the radiation flux associated with the rotation of the
magnetic white dwarf: Tmax=2437699.89079(59)
+0.0465464808(69).E-6.3(2)*10^{-13}E^2, which corresponds to the characteristic
timescale of the rotation spin-up of 4.67(14)*10^6 years. This contradicts the
estimated value of the mass of the white dwarf of 0.42M_\odot, based on X-ray
observations made by Yuasa et al (2010), however, is consistent with estimates
of the masses of 0.79 M_\odot (white dwarf) and 0.108 M_\odot (red dwarf)
previously published Beuermann and Reinsch (2008), and the assumption that the
capture of accreted plasma by magnetic field of the white dwarf is near the
border of the Roche lobe. Analyzed moments do not support the assumption of
Mauche et al (2009) for a statistically significant cubic term in the
ephemeris. Despite the presence of outbursts in EX Hya, there are significant
differences from the DO Dra, which supports the introduction to a detailed
classification of the intermediate polars the groups of "outbursting
intermediate polars" and "magnetic dwarf novae."


title: A Survey of Current Trends in Distributed, Grid and Cloud Computing

abstract:
  Through the 1990s to 2012 the internet changed the world of computing
drastically. It started its journey with parallel computing after it advanced
to distributed computing and further to grid computing. And in present scenario
it creates a new world which is pronounced as a Cloud Computing [1]. These all
three terms have different meanings. Cloud computing is based on backward
computing schemes like cluster computing, distributed computing, grid computing
and utility computing. The basic concept of cloud computing is virtualization.
It provides virtual hardware and software resources to various requesting
programs. This paper gives a detailed description about cluster computing, grid
computing and cloud computing and gives an insight of some implementations of
the same. We try to list the inspirations for the advent of all these
technologies. We also account for some present scenario faults of grid
computing and also discuss new cloud computing projects which are being managed
by the Government of India for learning. The paper also reviews the existing
work and covers (analytically), to some extent, some innovative ideas that can
be implemented.


title: A glimpse of the conformal structure of random planar maps

abstract:
  We present a way to study the conformal structure of random planar maps. The
main idea is to explore the map along an SLE (Schramm--Loewner evolution)
process of parameter $ \kappa = 6$ and to combine the locality property of the
SLE_{6} together with the spatial Markov property of the underlying lattice in
order to get a non-trivial geometric information. We follow this path in the
case of the conformal structure of random triangulations with a boundary. Under
a reasonable assumption called (*) that we have unfortunately not been able to
verify, we prove that the limit of uniformized random planar triangulations has
a fractal boundary measure of Hausdorff dimension $\frac{1}{3}$ almost surely.
This agrees with the physics KPZ predictions and represents a first step
towards a rigorous understanding of the links between random planar maps and
the Gaussian free field (GFF).


title: Napoli Tokyo Napoli

abstract:
  This is a Magistralis Lectio held in Naples the October 28 2010, at 150
anniversary of Birth of Jigoro Kano Judo Founding Father, on Judo History,
History of Biomechanics and Judo biomechanics. IN ITALIAN


title:
An Indoor Fingerprinting Localization Approach for ZigBee Wireless
  Sensor Networks

abstract:
  Location tracking systems are increasingly becoming the focus of research in
the field of Wireless Sensor Network (WSN). Received Signal Strength
(RSS)-based localization systems are at the forefront of tracking research
applications. Radio location fingerprinting is one of the most promising indoor
positioning approaches due to its powerful in terms of accuracy and cost.
However, fingerprinting systems require the collection of a large number of
reference points in the tracking area to achieve reasonable localization
accuracy. In this paper, we propose a fingerprinting localization approach
based on a RSS technique. The proposed system does not require gathering a
large number of reference points and offers good localization accuracy indoors.
The implemented approach is based on dividing the tracking area into subareas
and assigning a unique feature to each subarea through ranging the RSS values
from different reference points. In order to test the proposed system's
efficiency, a number of real experiments have been conducted using Jennic
sensor nodes.


title:
Vegetation pattern formation in semiarid systems without facilitative
  mechanisms

abstract:
  Regular vegetation patterns in semiarid ecosystems are believed to arise from
the interplay between long-range competition and facilitation processes acting
at smaller distances. We show that, under rather general conditions, long-range
competition alone may be enough to shape these patterns. To this end we propose
a simple, general model for the dynamics of vegetation, which includes only
long-range competition between plants. Competition is introduced through a
nonlocal term, where the kernel function quantifies the intensity of the
interaction. We recover the full spectrum of spatial structures typical of
vegetation models that also account for facilitation in addition to
competition.

categories: q-bio.PE cond-mat.other nlin.PS physics.bio-ph


title: Dynamics of Unitary Operators

abstract:
  We consider the iteration of a unitary operator on a separable Hilbert space
and study the spreading rates of the associated discrete-time dynamical system
relative to a given orthonormal basis. We prove lower bounds for the transport
exponents, which measure the time-averaged spreading on a power-law scale, in
terms of dimensional properties of the spectral measure associated with the
unitary operator and the initial state. These results are the unitary analog of
results established in recent years for the dynamics of the Schr\"odinger
equation, which is a continuum-time dynamical system associated with a
self-adjoint operator. We discuss how these general results may be studied by
means of subordinacy theory in cases where the unitary operator is given by a
CMV matrix. An example of particular interest in which this scenario arises is
given by a time-homogeneous quantum walk on the integers. For the particular
case of the time-homogeneous Fibonacci quantum walk, we illustrate how these
components work together and produce explicit lower bounds for the transport
exponents associated with this model.


title: A New Halpha Emission-Line Survey in the Orion Nebula Cluster

abstract:
  We present results from an Halpha emission-line survey in a one square degree
area centered on the Orion Nebula Cluster, obtained with the Wide Field Grism
Spectrograph-2 on the 2.2-meter telescope of the University of Hawaii. We
identified 587 stars with Halpha emission, 99 of which, located mainly in the
outer regions of the observed area, have not appeared in previous Halpha
surveys. We determined the equivalent width (EW) of the line, and based on it
classified 372 stars as classical T Tauri stars (CTTS) and 187 as weak line T
Tauri stars (WTTS). Simultaneous r', i' photometry indicates a limiting
magnitude of r' ~ 20 mag, but the sample is incomplete at r' > 17 mag. The
surface distribution of the Halpha emission stars reveals a clustered and a
dispersed population, the former consisting of younger and more massive young
stars than the latter. Comparison of the derived EWs with those found in the
literature indicates variability of the Halpha line. We found that the typical
amplitudes of the variability are not greater than a factor 2-3 in the most
cases. We identified a subgroup of low-EW stars with infrared signatures
indicative of optically thick accretion disks. We studied the correlations
between the equivalent width and other properties of the stars. Based on
literature data we examined several properties of our CTTS and WTTS subsamples
and found significant differences in mid-infrared color indices, average
rotational periods, and spectral energy distribution characteristics of the
subsamples.


title: Dynamic thermoelectric and heat transport in mesoscopic capacitors

abstract:
  We discuss the low-frequency response of charge and heat transport to
oscillatory voltage and temperature shifts in mesoscopic capacitors. We obtain
within scattering theory generic expressions for the quantum admittances up to
second order in the ac frequencies in terms of electric, thermoelectric and
heat capacitances and relaxation resistances. Remarkably, we find that the
thermocurrent can lead or lag the applied temperature depending on the gate
voltage applied to a quantum $RC$ circuit. Furthermore, the relaxation
resistance for cross terms becomes nonuniversal as opposed to the purely
electric or thermal cases.


title:
Exotic Fractional Topological States in Two-Dimensional Organometallic
  Material

abstract:
  Fractional Chern insulators (FCIs), having properties similar to those of the
fractional quantum Hall effect, have been established numerically in various
toy models. To fully explore their fundamental physics and to develop practical
applications, material realization is indispensable. Here we theoretically
predict a realization of FCI in a two-dimensional organometallic material,
which is known to have the prerequisite topological at bands. Using numerical
exact diagonalization we demonstrate that the presence of strong electronic
correlations and fractional filling of such a system could lead to a rich phase
diagram, including Abelian fractional quantum Hall (FQH), Fermi-liquid, and
Wigner crystal states. In particular, the FQH state has been confirmed
systematically by calculating the topological ground-state degeneracies,
topological Chern number, and the quasihole excitation spectrum as well as the
particle entanglement spectrum. Future experimental realization of the FQH
state in such material may provide a route for developing practical
applications of FCI with no need of the extreme conditions.


title:
On continuous distribution functions, minimax and best invariant
  estimators, and integrated balanced loss functions

abstract:
  We consider the problem of estimating a continuous distribution function $F$,
as well as meaningful functions $\tau(F)$ under a large class of loss
functions. We obtain best invariant estimators and establish their minimaxity
for H\"{o}lder continuous $\tau$'s and strict bowl-shaped losses with a bounded
derivative. We also introduce and motivate the use of integrated balanced loss
functions which combine the criteria of an integrated distance between a
decision $d$ and $F$, with the proximity of $d$ with a target estimator $d_0$.
Moreover, we show how the risk analysis of procedures under such an integrated
balanced loss relates to a dual risk analysis under an "unbalanced" loss, and
we derive best invariant estimators, minimax estimators, risk comparisons,
dominance and inadmissibility results. Finally, we expand on various
illustrations and applications relative to maxima-nomination sampling,
median-nomination sampling, and a case study related to bilirubin levels in the
blood of babies suffering from jaundice.


title: Strong coupling theory of spin and orbital excitations in Sr2IrO4

abstract:
  We study the low-lying excitations in 5d transition-metal oxide Sr_2IrO_4 on
the localized electron picture. We find that Hund's coupling together with the
spin-orbit interaction leads to exchange anisotropy which causes the spin wave
gap. Introducing the isospin operators acting on Kramers' doublet in Ir atoms,
we derive the effective spin Hamiltonian from a multi-orbital Hubbard model
with the t_{2g} orbitals in the square lattice. We introduce the Green's
functions including the anomalous type for the boson operators by expanding the
spin operators in terms of boson operators in the lowest order of 1/S, and
solve the coupled equations of motion for those functions. Two modes are found
to emerge with slightly different energies, in contrast to the spin waves in
the isotropic Heisenberg model. At the $\Gamma$-point, one mode has the zero
excitation energy while another has a finite energy. They have the same
excitation energy at the M point, but still have different energies at the X
point.


title: Semantic Computing of Moods Based on Tags in Social Media of Music

abstract:
  Social tags inherent in online music services such as Last.fm provide a rich
source of information on musical moods. The abundance of social tags makes this
data highly beneficial for developing techniques to manage and retrieve mood
information, and enables study of the relationships between music content and
mood representations with data substantially larger than that available for
conventional emotion research. However, no systematic assessment has been done
on the accuracy of social tags and derived semantic models at capturing mood
information in music. We propose a novel technique called Affective Circumplex
Transformation (ACT) for representing the moods of music tracks in an
interpretable and robust fashion based on semantic computing of social tags and
research in emotion modeling. We validate the technique by predicting listener
ratings of moods in music tracks, and compare the results to prediction with
the Vector Space Model (VSM), Singular Value Decomposition (SVD), Nonnegative
Matrix Factorization (NMF), and Probabilistic Latent Semantic Analysis (PLSA).
The results show that ACT consistently outperforms the baseline techniques, and
its performance is robust against a low number of track-level mood tags. The
results give validity and analytical insights for harnessing millions of music
tracks and associated mood data available through social tags in application
development.


title: Rich families and elementary submodels

abstract:
  We compare two methods of proving separable reduction theorems in functional
analysis -- the method of rich families and the method of elementary submodels.
We show that any result proved using rich families holds also when formulated
with elementary submodels and the converse is true in spaces with fundamental
minimal system an in spaces of density $\aleph_1$. We do not know whether the
converse is true in general. We apply our results to show that a projectional
skeleton may be without loss of generality indexed by ranges of its
projections.


title:
Phenomenological Varying Modified Chaplygin Gas with Variable $G$ and
  $\Lambda$: Toy Models for Our Universe

abstract:
  This article motivated by the recent articles and results of two authors.
Recently, J. Sadeghi and H. Farahani presented a work [1], where they include
viscosity and analyze general model, by this way they extended models
considered by M. Khurshudyan [2] and [3]. In this article, We tempt to consider
varying Modified Chaplygin gas model in case of variable $G$ and $\Lambda$. It
is well known, that varying $G$ and $\Lambda$ gives rise to modified field
equations and modified conservation laws. We will consider two different toy
models. First model is a Universe with one component phenomenological gas of
our consideration, while for the second model we assume existence of a composed
fluid of gas and a matter with $P=\omega(t)\rho_{m}$. Sign changeable
interaction between fluids is accepted. We will analyze important cosmological
parameters like EoS parameter of a fluid, deceleration parameter $q$ of the
model.


title: Parameterized Algorithms for Load Coloring Problem

abstract:
  One way to state the Load Coloring Problem (LCP) is as follows. Let $G=(V,E)$
be graph and let $f:V\rightarrow \{{\rm red}, {\rm blue}\}$ be a 2-coloring. An
edge $e\in E$ is called red (blue) if both end-vertices of $e$ are red (blue).
For a 2-coloring $f$, let $r'_f$ and $b'_f$ be the number of red and blue edges
and let $\mu_f(G)=\min\{r'_f,b'_f\}$. Let $\mu(G)$ be the maximum of $\mu_f(G)$
over all 2-colorings.
  We introduce the parameterized problem $k$-LCP of deciding whether $\mu(G)\ge
k$, where $k$ is the parameter. We prove that this problem admits a kernel with
at most $7k$. Ahuja et al. (2007) proved that one can find an optimal
2-coloring on trees in polynomial time. We generalize this by showing that an
optimal 2-coloring on graphs with tree decomposition of width $t$ can be found
in time $O^*(2^t)$. We also show that either $G$ is a Yes-instance of $k$-LCP
or the treewidth of $G$ is at most $2k$. Thus, $k$-LCP can be solved in time
$O^*(4^k).$


title:
SDO/AIA and Hinode/EIS Observations of Interaction Between an EUV Wave
  and Active Region Loops

abstract:
  We present detailed analysis of an extreme ultraviolet (EUV) wave and its
interaction with active region (AR) loops observed by the Solar Dynamics
Observatory/Atmospheric Imaging Assembly and the Hinode EUV Imaging
Spectrometer (EIS). This wave was initiated from AR 11261 on 2011 August 4 and
propagated at velocities of 430--910 km\s. It was observed to traverse another
AR and cross over a filament channel on its path. The EUV wave perturbed
neighboring AR loops and excited a disturbance that propagated toward the
footpoints of these loops. EIS observations of AR loops revealed that at the
time of the wave transit, the original redshift increased by about 3 km\s,
while the original blueshift decreased slightly. After the wave transit, these
changes were reversed. When the EUV wave arrived at the boundary of a polar
coronal hole, two reflected waves were successively produced and part of them
propagated above the solar limb. The first reflected wave above the solar limb
encountered a large-scale loop system on its path, and a secondary wave rapidly
emerged 144 Mm ahead of it at a higher speed. These findings can be explained
in the framework of a fast-mode magnetosonic wave interpretation for EUV waves,
in which observed EUV waves are generated by expanding coronal mass ejections.


title:
An Efficient Self-optimized Sampling Method for Rare Events in
  Nonequilibrium Systems

abstract:
  Rare events such as nucleation processes are of ubiquitous importance in real
systems. The most popular method for nonequilibrium systems, forward flux
sampling (FFS), samples rare events by using interfaces to partition the whole
transition process into sequence of steps along an order parameter connecting
the initial and final states. FFS usually suffers from two main difficulties:
low computational efficiency due to bad interface locations and even being not
applicable when trapping into unknown intermediate metastable states. In the
present work, we propose an approach to overcome these difficulties, by
self-adaptively locating the interfaces on the fly in an optimized manner.
Contrary to the conventional FFS which set the interfaces with euqal distance
of the order parameter, our approach determines the interfaces with equal
transition probability which is shown to satisfy the optimization condition.
This is done by firstly running long local trajectories starting from the
current interface $\l_i$ to get the conditional probability distribution $P_c$,
and then determining $\l_{i+1}$ by equalling $P_c$ to a give value $p_0$. With
these optimized interfaces, FFS can be run in a much efficient way. In
addition, our approach can conveniently find the intermediate metastable states
by monitoring some special long trajectories that nither end at the initial
state nor reach the next interface, the number of which will increase sharply
from zero if such metastable states are encountered. We apply our approach to a
model two-state system and a two-dimensional lattice gas Ising model. Our
approach is shown to be much more efficient than the conventional FFS method
without losing accuracy, and it can also well reproduce the two-step nucleation
scenario of the Ising model with easy identification of the intermidiate
metastable state.


title: Sums of products of power sums

abstract:
  For any two arithmetic functions $f,g$ let $\bullet$ be the commutative and
associative arithmetic convolution $(f\bullet g)(k):=\sum_{m=0}^k \left(
  \begin{array}{c}
  k
  m
  \end{array}
  \right)f(m)g(k-m)$ and for any $n\in\mathbb{N},$ $f^n=f\bullet \cdots\bullet
f$ be $n-$fold product of $f\in \mathcal{S}.$ For any $x\in\mathbb{C},$ let
$\mathcal{S}_0=e$ be the multiplicative identity of the ring
$(\mathcal{S},\bullet,+)$ and
$\mathcal{S}_x(k):=\frac{\mathcal{B}_{x+1}(k+1)-\mathcal{B}_{1}(k+1)}{k+1},~x\neq
0$ denote the power sum defined by Bernoulli polynomials
$\mathcal{B}_x(k)=B_k(x).$ We consider the sums of products
$\mathcal{S}_x^N(k),~N\in\mathbb{N}_0.$ A closed form expression for
$\mathcal{S}^N_x(k)(x)$ generalizing the classical Faulhaber formula, is
derived. Furthermore, some properties of $\alpha-$Euler numbers \cite{JS9}(a
variant of Apostol Bernoulli numbers) and their sums of products, are
considered using which a closed form expression for the sums of products of
infinite series of the form $\eta_\alpha(k):=\sum_{n=0}^{\infty}\alpha^n
n^k,~0<|\alpha|<1,~k\in\mathbb{N}_0$ and the related Abel sums, is obtained
which in particular, gives a closed form expression for well known Bernoulli
numbers. A generalization of the sums of products of power sums to the sums of
products of alternating power sums is also obtained. These considerations
generalize in a unified way to define sums of products of power sums for all
$k\in\mathbb{N}$ hence connecting them with zeta functions.


title:
Domain wall tilting in the presence of the Dzyaloshinskii-Moriya
  interaction in out-of-plane magnetized magnetic nanotracks

abstract:
  We show that the Dzyaloshinskii-Moriya interaction (DMI) can lead to a
tilting of the domain wall (DW) surface in perpendicularly magnetized magnetic
nanotracks when DW dynamics is driven by an easy axis magnetic field or a spin
polarized current. The DW tilting affects the DW dynamics for large DMI and the
tilting relaxation time can be very large as it scales with the square of the
track width. The results are well explained by an analytical model based on a
Lagrangian approach where the DMI and the DW tilting are included. We propose a
simple way to estimate the DMI in a magnetic multilayers by measuring the
dependence of the DW tilt angle on a transverse static magnetic field. Our
results shed light on the current induced DW tilting observed recently in Co/Ni
multilayers with inversion asymmetry, and further support the presence of DMI
in these systems.


title: Higgs Boson Phenomenology in a Simple Model with Vector Resonances

abstract:
  In this paper we consider a simple scenario where the Higgs boson and two
vector resonances are supposed to arise from a new strong interacting sector.
We use the ATLAS measurements of the dijet spectrum to set limits on the masses
of the resonances. Additionally we compute the Higgs boson decay to two photons
and found, when compare to the Standard Model prediction, a small excess which
is compatible with ATLAS measurements. Finally we make prediction for
Higgs-strahlung processes for the LHC running at 14 TeV.


title: Poly-Cauchy numbers and polynomials of the second kind

abstract:
  In this paper, we consider the poly-cauchy polynomials and numbers of the
second kind which were studied by Komatsu in [10]. We note that the poly-Cauchy
polynomials of the second kind are the special generalized Bernoulli
polynomials of the second kind. The purpose of this paper is to give various
identities of the poly-Cauchy polynomials of the second kind which are derived
from umbral calculus.


title:
Factorization approach to structured low-rank approximation with
  applications

abstract:
  We consider the problem of approximating an affinely structured matrix, for
example a Hankel matrix, by a low-rank matrix with the same structure. This
problem occurs in system identification, signal processing and computer
algebra, among others. We impose the low-rank by modeling the approximation as
a product of two factors with reduced dimension. The structure of the low-rank
model is enforced by introducing a penalty term in the objective function. The
proposed local optimization algorithm is able to solve the weighted structured
low-rank approximation problem, as well as to deal with the cases of missing or
fixed elements. In contrast to approaches based on kernel representations (in
linear algebraic sense), the proposed algorithm is designed to address the case
of small targeted rank. We compare it to existing approaches on numerical
examples of system identification, approximate greatest common divisor problem,
and symmetric tensor decomposition and demonstrate its consistently good
performance.


title:
Probing Neutrino Flavor Transition Mechanism with Ultra High Energy
  Astrophysical Neutrinos

abstract:
  Observation of ultra-high energy astrophysical neutrinos and identification
of their flavors have been proposed for future neutrino telescopes. The flavor
ratio of astrophysical neutrinos observed on the Earth depends on both the
initial flavor ratio at the source and flavor transitions taking place during
propagations of these neutrinos. The flavor transition mechanisms are
well-classified with our model-independent parametrization. We find a new
parameter R={\phi}_e/({\phi}_{\mu} + {\phi}_{\tau}) can probe directly the
flavor transition in the framework of our model-independent parametrization,
without the assumption of the {\nu}_{\mu}-{\nu}_{\tau} symmetry. A few flavor
transition models are employed to test our parametrization with this new
observable. The observational constraints on flavor transition mechanisms by
the new observable is discussed through our model-independent parametrization.


title: $q$-Analogs of $t$-Wise Balanced Designs from Borel Subgroups

abstract:
  A $t\text{-}(n,K,\lambda;q)$ design, also called the $q$-analog of a $t$-wise
balanced design, is a set ${\mathcal B}$ of subspaces with dimensions contained
in $K$ of the $n$-dimensional vector space ${\mathbb F}_q^n$ over the finite
field with $q$ elements such that each $t$-subspace of ${\mathbb F}_q^n$ is
contained in exactly $\lambda$ elements of ${\mathcal B}$. In this paper we
give a construction of an infinite series of nontrivial
$t\text{-}(n,K,\lambda;q)$ designs with $|K|=2$ for all dimensions $t\ge 1$ and
all prime powers $q$ admitting the standard Borel subgroup as group of
automorphisms. Furthermore, replacing $q=1$ gives an ordinary $t$-wise balanced
design defined on sets.


title:
Angular analysis of $B^0 \to \phi K^{*}$ decays and search for CP
  violation at Belle

abstract:
  We report the measurements of branching fractions and CP violation
asymmetries in $B^0 \to \phi K^{*}$ decays obtained in an angular analysis
using the full data sample of $772 \times 10^6 B\bar{B}$ pairs collected at the
$\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy
$e^+ e^-$ collider. We perform a partial wave analysis to distinguish among
scalar [$B^0 \to \phi(K\pi)^{*}_{0}$], vector [$B^0 \to \phi K^{*}(892)^{0}$]
and tensor [$B^0 \to \phi K^{*}_{2}(1430)^{0}$] components, and determine the
corresponding branching fractions to be $\mathcal{B}[B^0 \to
\phi(K\pi)^{*}_{0}] = (4.3 \pm 0.4 \pm 0.4) \times 10^{-6}$, $\mathcal{B}[B^0
\to \phi K^{*}(892)^{0}] = (10.4 \pm 0.5 \pm 0.6) \times 10^{-6}$ and
$\mathcal{B}[B^0 \to \phi K^{*}_{2}(1430)^{0}] = (5.5 ^{+0.9}_{-0.7} \pm 1.0)
\times 10^{-6}$. We also measure the longitudinal polarization fraction $f_L$
in $B^0 \to \phi K^{*}(892)^{0}$ and $B^0 \to \phi K^{*}_{2}(1430)^{0}$ decays
to be $0.499 \pm 0.030 \pm 0.018$ and $0.918 ^{+0.029}_{-0.060} \pm 0.012$,
respectively. The first quoted uncertainties are statistical and the second are
systematic. In total, we measure 26 parameters related to branching fractions,
polarization and CP violation in the $B^0 \to \phi K^{*}$ system. No evidence
for CP violation is found.


title:
Spin gap evolution upon Ca doping in the spin ladder series
  $Sr_{14-x}Ca_xCu_{24}O_{41}$ by inelastic neutron scattering

abstract:
  The spin gap evolution upon Ca doping in Sr14-xCaxCu24O41 was systematically
investigated using inelastic neutron scattering. We discover that the
singlet-triplet spin gap excitation survives in this series with x up to 13,
indicating the singlet dimer ground state in these compounds. This observation
corrects the previous speculation that the spin gap collapses at x~13 by the
NMR technique. The strong intensity modulation along QH in x=0 gradually
evolves into a Q-independent feature in x>11. This could be attributed to the
localized Cu moment magnetism developing into an itinerant magnetism with
increasing x. It is a surprise that the spin gap persists in the normal state
of this spin ladder system with metallic behaviour, which evidences the
possibility of magnetically-mediated carrier pairing mechanism in a two-leg
spin ladder lattice.


title:
The Price of Anarchy in Bilateral Network Formation in an Adversary
  Model

abstract:
  We study network formation with the bilateral link formation rule (Jackson
and Wolinsky 1996) with $n$ players and link cost $\alpha>0$. After the network
is built, an adversary randomly destroys one link according to a certain
probability distribution. Cost for player $v$ incorporates the expected number
of players to which $v$ will become disconnected. This model was previously
studied for unilateral link formation (K. 2011).
  We prove existence of pairwise Nash equilibria under moderate assumptions on
the adversary and $n\geq 9$. As the main result, we prove bounds on the price
of anarchy for two special adversaries: one destroys a link chosen uniformly at
random, while the other destroys a link that causes a maximum number of player
pairs to be separated. We prove bounds tight up to constants, namely $O(1)$ for
one adversary (if $\alpha>1/2$), and $\Theta(n)$ for the other (if $\alpha>2$
considered constant and $n \geq 9$). The latter is the worst that can happen
for any adversary in this model (if $\alpha=\Omega(1)$).


title: The prototyping/early construction phase of the BAIKAL-GVD project

abstract:
  The Prototyping phase of the BAIKAL-GVD project has been started in April
2011 with the deployment of a three string engineering array which comprises
all basic elements and systems of the Gigaton Volume Detector (GVD) in Lake
Baikal. In April 2012 the version of engineering array which comprises the
first full-scale string of the GVD demonstration cluster has been deployed and
operated during 2012. The first stage of the GVD demonstration cluster which
consists of three strings is deployed in April 2013. We review the Prototyping
phase of the BAIKAL-GVD project and describe the configuration and design of
the 2013 engineering array.


title: Electromechanics in MoS2 and WS2: nanotubes vs. monolayers

abstract:
  The transition-metal dichalcogenides (TMD) MoS2 and WS2 show remarkable
electromechanical properties. Strain modifies the direct band gap into an
indirect one, and substantial strain even induces an semiconductor-metal
transition. Providing strain through mechanical contacts is difficult for TMD
monolayers, but state-of-the-art for TMD nanotubes. We show using
density-functional theory that similar electromechanical properties as in
monolayer and bulk TMDs are found for large diameter TMD single- (SWNT) and
multi-walled nanotubes (MWNTs). The semiconductor-metal transition occurs at
elongations of 16 %. We show that Raman spectroscopy is an excellent tool to
determine the strain of the nanotubes and hence monitor the progress of that
nanoelectromechanical experiment in situ. TMD MWNTs show twice the electric
conductance compared to SWNTs, and each wall of the MWNTs contributes to the
conductance proportional to its diameter.


title:
A white noise approach to stochastic integration with respect to the
  Rosenblatt process

abstract:
  In this paper, we define a stochastic calculus with respect to the Rosenblatt
process by means of white noise distribution theory. For this purpose, we
compute the translated characteristic function of the Rosenblatt process at
time $t>0$ in any direction $\xi\in S(\mathbb{R})$ and the derivative of the
Rosenblatt process in the white noise sense. Using Wick multiplication by the
former derivative and Pettis integration, we define our stochastic integral
with respect to the Rosenblatt process for a wide class of distribution
processes. We obtain an explicit formula for the variance of such a stochastic
integral and It\^o's formulae for a certain class of functionals of the
Rosenblatt process. Finally, we compare our stochastic integral to other
approaches.


title: Higher order extensions of the Gaussian effective potential

abstract:
  A variational method is discussed, extending the Gaussian effective potential
to higher orders. The single variational parameter is replaced by trial unknown
two-point functions, with infinite variational parameters to be optimized by
the solution of a set of integral equations. These stationary conditions are
derived by the self-energy without having to write the effective potential,
making use of a general relation between self-energy and functional derivatives
of the potential. This connection is proven to any order and verified up to
second order by an explicit calculation for the scalar theory. Among several
variational strategies, the methods of minimal sensitivity and of minimal
variance are discussed in some detail. For the scalar theory, at variance with
other post-Gaussian approaches, the pole of the second-order propagator is
shown to satisfy the simple first-order gap equation that seems to be more
robust than expected. By the method of minimal variance, nontrivial results are
found for gauge theories containing fermions, where the first-order Gaussian
approximation is known to be useless.


title:
Ultrabroadband direct detection of nonclassical photon statistics at
  telecom wavelength

abstract:
  Broadband light sources play essential roles in diverse fields, such as
high-capacity optical communications, optical coherence tomography, optical
spectroscopy, and spectrograph calibration. Though an ultrabroadband
nonclassical state from standard spontaneous parametric down-conversion may
serve as a quantum counterpart, its detection and quantum characterization have
been a challenging task. Here we demonstrate the quantitative characterization
of a multimode structure in such an ultrabroadband (150 nm FWHM) squeezed state
at telecom wavelength (1.5 \mu m). The nonclassical photon distribution of our
highly multimode state is directly observed using a superconducting
transition-edge sensor. From the observed photon correlation functions, we show
that several tens of different squeezers are coexisting in the same spatial
mode. We anticipate our results and technique open up a new possibility to
generate and characterize nonclassical light sources for a large-scale optical
quantum network in the frequency domain.


title:
Tweeting biomedicine: an analysis of tweets and citations in the
  biomedical literature

abstract:
  Data collected by social media platforms have recently been introduced as a
new source for indicators to help measure the impact of scholarly research in
ways that are complementary to traditional citation-based indicators. Data
generated from social media activities related to scholarly content can be used
to reflect broad types of impact. This paper aims to provide systematic
evidence regarding how often Twitter is used to diffuse journal articles in the
biomedical and life sciences. The analysis is based on a set of 1.4 million
documents covered by both PubMed and Web of Science (WoS) and published between
2010 and 2012. The number of tweets containing links to these documents was
analyzed to evaluate the degree to which certain journals, disciplines, and
specialties were represented on Twitter. It is shown that, with less than 10%
of PubMed articles mentioned on Twitter, its uptake is low in general. The
relationship between tweets and WoS citations was examined for each document at
the level of journals and specialties. The results show that tweeting behavior
varies between journals and specialties and correlations between tweets and
citations are low, implying that impact metrics based on tweets are different
from those based on citations. A framework utilizing the coverage of articles
and the correlation between Twitter mentions and citations is proposed to
facilitate the evaluation of novel social-media based metrics and to shed light
on the question in how far the number of tweets is a valid metric to measure
research impact.


title:
Model and Performance of a No-Reference Quality Assessment Metric for
  Video Streaming

abstract:
  Video streaming via TCP networks has become a popular and highly demanded
service, but its quality assessment in both objective and subjective terms has
not been properly addressed. In this paper, based on statistical analysis a
full analytic model of a no-reference objective metric, namely Pause Intensity,
for video quality assessment is presented. The model characterizes the video
playout buffer behavior in connection with the network performance (throughput)
and the video playout rate. This allows for instant quality measurement and
control without requiring a reference video. Pause intensity specifically
addresses the need for assessing the quality issue in terms of the continuity
in the playout of TCP streaming videos, which cannot be properly measured by
other objective metrics such as PSNR, SSIM and buffer underrun or pause
frequency. The performance of the analytical model is rigidly verified by
simulation results and subjective tests using a range of video clips. It is
demonstrated that pause intensity is closely correlated with viewer opinion
scores regardless of the vastly different composition of individual elements,
such as pause duration and pause frequency which jointly constitute this new
quality metric. It is also shown that the correlation performance of pause
intensity is consistent and content independent.


title:
Mass bounds for baryogenesis from particle decays and the inert doublet
  model

abstract:
  In models for thermal baryogenesis from particle decays, the mass of the
decaying particle is typically many orders of magnitude above the TeV scale. We
will discuss different ways to lower the energy scale of baryogenesis and
present the corresponding lower bounds on the particle's mass. This is done
specifically for the inert doublet model with heavy Majorana neutrinos and then
we indicate how to extrapolate the results to other scenarios. We also revisit
the question of whether or not dark matter, neutrino masses, and the cosmic
baryon asymmetry can be explained simultaneously at low energies in the inert
doublet model.


title:
Search for new phenomena in final states with large jet multiplicities
  and missing transverse momentum at sqrt(s)=8 TeV proton-proton collisions
  using the ATLAS experiment

abstract:
  A search is presented for new particles decaying to large numbers (7 to
greater or equal to 10) of jets, missing transverse momentum and no isolated
electrons or muons. This analysis uses 20.3/fb of pp collision data at
sqrt(s)=8 TeV collected by the ATLAS experiment at the Large Hadron Collider.
The sensitivity of the search is enhanced by considering the number of b-tagged
jets and the scalar sum of masses of large-radius jets in an event. No evidence
is found for physics beyond the Standard Model. The results are interpreted in
the context of various simplified supersymmetry-inspired models where gluinos
are pair produced, as well as a mSUGRA/CMSSM model.


title: Lifshitz asymptotics for percolation Hamiltonians

abstract:
  We study a discrete Laplace operator $\Delta$ on percolation subgraphs of an
infinite graph. The ball volume is assumed to grow at most polynomially. We are
interested in the behavior of the integrated density of states near the lower
spectral edge. If the graph is a Cayley graph we prove that it exhibits
Lifshitz tails. If we merely assume that the graph has an exhausting sequence
with positive $\delta$-dimensional density, we obtain an upper bound on the
integrated density of states of Lifshitz type.


title: Mechanisms in Environmentally-Assisted One-photon Phase Control

abstract:
  The ability of an environment to assist in one-photon phase control relies
upon entanglement between the system and bath and on the breaking of the time
reversal symmetry. Here, one photon phase control is examined analytically and
numerically in a model system, allowing an analysis of the relative strength of
these contributions. Further, the significant role of non-Markovian dynamics
and of moderate system-bath coupling in enhancing one-photon phase control is
demonstrated, and an explicit role for quantum mechanics is noted in the
existence of initial non-zero stationary coherences. Finally, desirable
conditions are shown to be required to observe such environmentally assisted
control, since the system will naturally equilibrate with its environment at
longer times, ultimately resulting in the loss of phase control.


title: Dipoles on a Two-leg Ladder

abstract:
  We study polar molecules with long-range dipole-dipole interactions confined
to move on a two-leg ladder for different orientations of the molecular dipole
moments with respect to the ladder. Matrix product states are employed to
calculate the many-body ground state of the system as function of lattice
filling fractions, perpendicular hopping between the legs, and dipole
interaction strength. We show that the system exhibits zig-zag ordering when
the dipolar interactions are predominantly repulsive. As a function of dipole
moment orientation with respect to the ladder, we find that there is a critical
angle at which ordering disappears. This angle is slightly larger than the
angle at which the dipoles are non-interacting along a single leg. This
behavior should be observable using current experimental techniques.


title:
Stellar Rotation Periods of the Kepler Objects of Interest: A Dearth of
  Close-in Planets around Fast Rotators

abstract:
  We present a large sample of stellar rotation periods for Kepler Objects of
Interest (KOIs), based on three years of public Kepler data. These were
measured by detecting periodic photometric modulation caused by star spots,
using an algorithm based on the autocorrelation function (ACF) of the light
curve, developed recently by McQuillan, Aigrain & Mazeh (2013). Of the 1919
main-sequence exoplanet hosts analyzed, robust rotation periods were detected
for 737. Comparing the detected stellar periods to the orbital periods of the
innermost planet in each system reveals a notable lack of close-in planets
around rapid rotators. It appears that only slowly spinning stars, with
rotation periods longer than 5-10 days, host planets on orbits shorter than 3
days, although the mechanism(s) that lead(s) to this is not clear.


title:
Developing and Testing the Automated Post-Event Earthquake Loss
  Estimation and Visualisation (APE-ELEV) Technique

abstract:
  An automated, real-time, multiple sensor data source relying and globally
applicable earthquake loss model and visualiser is desirable for post-event
earthquake analysis. To achieve this there is a need to support rapid data
ingestion, loss estimation and integration of data from multiple data sources
and rapid visualisation at multiple geographic levels. In this paper, the
design and development of the Automated Post-Event Earthquake Loss Estimation
and Visualisation (APE-ELEV) system for real-time estimation and visualisation
of insured losses incurred due to earthquakes is presented. A model for
estimating ground up and net of facultative losses due to earthquakes in near
real-time is implemented. Since post-event data is often available immediately
from multiple disparate sources, a geo-browser is employed to facilitate the
visualisation and integration of earthquake hazard, exposure and loss data. The
feasibility of APE-ELEV is demonstrated using a test case earthquake that
occurred in Tohoku, Japan (2011). The APE-ELEV model is further validated for
ten global earthquakes using industry loss data.


title:
The Royal Birth of 2013: Analysing and Visualising Public Sentiment in
  the UK Using Twitter

abstract:
  Analysis of information retrieved from microblogging services such as Twitter
can provide valuable insight into public sentiment in a geographic region. This
insight can be enriched by visualising information in its geographic context.
Two underlying approaches for sentiment analysis are dictionary-based and
machine learning. The former is popular for public sentiment analysis, and the
latter has found limited use for aggregating public sentiment from Twitter
data. The research presented in this paper aims to extend the machine learning
approach for aggregating public sentiment. To this end, a framework for
analysing and visualising public sentiment from a Twitter corpus is developed.
A dictionary-based approach and a machine learning approach are implemented
within the framework and compared using one UK case study, namely the royal
birth of 2013. The case study validates the feasibility of the framework for
analysis and rapid visualisation. One observation is that there is good
correlation between the results produced by the popular dictionary-based
approach and the machine learning approach when large volumes of tweets are
analysed. However, for rapid analysis to be possible faster methods need to be
developed using big data techniques and parallel methods.


title: Comptonization of photons near the photosphere of relativistic outflows

abstract:
  We consider the formation of photon spectrum at the photosphere of
ultrarelativistically expanding outflow. We use the Fokker-Planck approximation
to the Boltzmann equation, and obtain the generalized Kompaneets equation which
takes into account anisotropic distribution of photons developed near the
photosphere. This equation is solved numerically for relativistic steady wind
and the observed spectrum is found in agreement with previous studies. We also
study the photospheric emission for different temperature dependences on radius
in such outflows. In particular, we found that for $T\propto r^{-2}$ the Band
low energy photon index of the observed spectrum is $\alpha\simeq -1$, as
typically observed in Gamma Ray Bursts.


title: On the Alternative Theories of Cosmology

abstract:
  In this article first we present a brief review of some alternative theories
of cosmology. Then by referring to some of the main works done in these
theories we show that how they can describe the phenomena which are explained
nowadays in the framework of standard model of cosmology(SM).


title:
Multi-stabilities and symmetry-broken one-colour and two-colour states
  in closely coupled single-mode lasers

abstract:
  We theoretically investigate the dynamics of two mutually coupled identical
single-mode semi-conductor lasers. For small separation and large coupling
between the lasers, symmetry-broken one-colour states are shown to be stable.
In this case the light output of the lasers have significantly different
intensities while at the same time the lasers are locked to a single common
frequency. For intermediate coupling we observe stable symmetry-broken
two-colour states, where both lasers lase simultaneously at two optical
frequencies which are separated by up to 150~GHz. Using a five dimensional
model we identify the bifurcation structure which is responsible for the
appearance of symmetric and symmetry-broken one-colour and two-colour states.
Several of these states give rise to multi-stabilities and therefore allow for
the design of all-optical memory elements on the basis of two coupled
single-mode lasers. The switching performance of selected designs of optical
memory elements is studied numerically.


title: B-physics from Nf=2 tmQCD: the Standard Model and beyond

abstract:
  We present a lattice QCD computation of the b-quark mass, the B and B_s decay
constants, the B-mixing bag parameters for the full four-fermion operator basis
as well as determinations for \xi and f_{Bq}\sqrt{B_i^{(q)}} extrapolated to
the continuum limit and to the physical pion mass. We used N_f = 2 twisted mass
Wilson fermions at four values of the lattice spacing with pion masses ranging
from 280 to 500 MeV. Extrapolation in the heavy quark mass from the charm to
the bottom quark region has been carried out on ratios of physical quantities
computed at nearby quark masses, exploiting the fact that they have an exactly
known infinite mass limit. Our results are m_b(m_b,
\overline{\rm{MS}})=4.29(12) GeV, f_{Bs}=228(8) MeV, f_{B}=189(8) MeV and
f_{Bs}/f_B=1.206(24). Moreover with our results for the bag-parameters we find
\xi=1.225(31), B_1^{(s)}/B_1^{(d)}=1.01(2), f_{Bd}\sqrt{\hat{B}_{1}^{(d)}} =
216(10) MeV and f_{Bs}\sqrt{\hat{B}_{1}^{(s)}} = 262(10) MeV. We also computed
the bag parameters for the complete basis of the four-fermion operators which
are required in beyond the SM theories. By using these results for the bag
parameters we are able to provide a refined Unitarity Triangle analysis in the
presence of New Physics, improving the bounds coming from B_{(s)}-\bar B_{(s)}
mixing.


title: Discrete Newtonian Cosmology

abstract:
  In this paper we lay down the foundations for a purely Newtonian theory of
cosmology, valid at scales small compared with the Hubble radius, using only
Newtonian point particles acted on by gravity and a possible cosmological term.
We describe the cosmological background which is given by an exact solution of
the equations of motion in which the particles expand homothetically with their
comoving positions constituting a central configuration. We point out, using
previous work, that an important class of central configurations are
homogeneous and isotropic, thus justifying the usual assumptions of elementary
treatments. The scale factor is shown to satisfy the standard Raychaudhuri and
Friedmann equations without making any fluid dynamic or continuum
approximations. Since we make no commitment as to the identity of the point
particles, our results are valid for cold dark matter, galaxies, or clusters of
galaxies. In future publications we plan to discuss perturbations of our
cosmological background from the point particle viewpoint laid down in this
paper and show consistency with much standard theory usually obtained by more
complicated and conceptually less clear continuum methods. Apart from its
potential use in large scale structure studies, we believe that out approach
has great pedagogic advantages over existing elementary treatments of the
expanding universe, since it requires no use of general relativity or continuum
mechanics but concentrates on the basic physics: Newton's laws for
gravitationally interacting particles.


title: Poincar\'e theory for compact abelian one-dimensional solenoidal groups

abstract:
  This article presents a generalization of the notion of \emph{Poincar\'e
rotation set} to homeomorphisms of the ad\`ele class group
$\mathbb{A}/\mathbb{Q}$ of the rational numbers $\mathbb{Q}$, which is a
connected compact abelian group which can be identified with the
one-dimensional universal solenoid $\mathbf{S}$, \ie the algebraic universal
covering of the circle. The definition is first introduced in general for
homeomorphisms of $\mathbf{S}$ which are isotopic to a translation, and then
specializing in homeomorphisms of $\mathbf{S}$ isotopic to the identity, in
which case the rotation set is a closed interval contained in the base leaf
(the connected component of the identity). If in the latter case the rotation
interval reduces to a single element $\rho$ and $\rho$ is irrational (\ie it is
a monothetic generator of $\mathbf{S}$), we show that the homeomorphism is
semiconjugate to the translation $z\mapsto\rho{z}$, like in the classical
theory of Poincar\'e. This theory is valid for any general compact abelian one
dimensional solenoidal group $\mathbf{S}_G$, which are Pontryagin duals of
dense subgroups $G$ of the rational numbers with the discrete topology. These
solenoidal groups are one-dimensional laminations which are locally
homeomorphic to the product of a Cantor set by an interval so they behave very
much like a ``diffuse'' version of the circle. Our approach differs from others
because we use Pontryagin duality of compact abelian groups to define the
rotation sets.
  \end{abstract}


title: Full counting statistics and phase diagram of a dissipative Rydberg gas

abstract:
  Ultra-cold gases excited to strongly interacting Rydberg states are a
promising system for quantum simulations of many-body systems. For off-resonant
excitation of such systems in the dissipative regime, highly correlated
many-body states exhibiting, among other characteristics, intermittency and
multi-modal counting distributions are expected to be created. So far,
experiments with Rydberg atoms have been carried out in the resonant,
non-dissipative regime. Here we realize a dissipative gas of rubidium Rydberg
atoms and measure its full counting statistics for both resonant and
off-resonant excitation. We find strongly bimodal counting distributions in the
off-resonant regime that are compatible with intermittency due to the
coexistence of dynamical phases. Moreover, we measure the phase diagram of the
system and find good agreement with recent theoretical predictions. Our results
pave the way towards detailed studies of many-body effects in Rydberg gases.


title:
Discovery of the spectroscopic binary nature of three bright southern
  Cepheids

abstract:
  We present an analysis of spectroscopic radial velocity and photometric data
of three bright Galactic Cepheids: LR Trianguli Australis (LR TrA), RZ Velorum
(RZ Vel), and BG Velorum (BG Vel). Based on new radial velocity data, these
Cepheids have been found to be members of spectroscopic binary systems.
  The ratio of the peak-to-peak radial velocity amplitude to photometric
amplitude indicates the presence of a companion for LR TrA and BG Vel. IUE
spectra indicate that the companions of RZ Vel and BG Vel cannot be hot stars.
  The analysis of all available photometric data revealed that the pulsation
period of RZ Vel and BG Vel varies monotonically, due to stellar evolution.
Moreover, the longest period Cepheid in this sample, RZ Vel, shows period
fluctuations superimposed on the monotonic period increase. The light-time
effect interpretation of the observed pattern needs long-term photometric
monitoring of this Cepheid. The pulsation period of LR TrA has remained
constant since the discovery of its brightness variation.
  Using statistical data, it is also shown that a large number of spectroscopic
binaries still remain to be discovered among bright classical Cepheids.


title:
A GPGPU based program to solve the TDSE in intense laser fields through
  the finite difference approach

abstract:
  We present a General-purpose computing on graphics processing units (GPGPU)
based computational program and framework for the electronic dynamics of atomic
systems under intense laser fields. We present our results using the case of
hydrogen, however the code is trivially extensible to tackle problems within
the single-active electron (SAE) approximation. Building on our previous work,
we introduce the first available GPGPU based implementation of the Taylor,
Runge-Kutta and Lanczos based methods created with strong field ab-initio
simulations specifically in mind; CLTDSE. The code makes use of finite
difference methods and the OpenCL framework for GPU acceleration. The specific
example system used is the classic test system; Hydrogen. After introducing the
standard theory, and specific quantities which are calculated, the code,
including installation and usage, is discussed in-depth. This is followed by
some examples and a short benchmark between an 8 hardware thread (i.e logical
core) Intel Xeon CPU and an AMD 6970 GPU, where the parallel algorithm runs 10
times faster on the GPU than the CPU.


title: PANAS-t: A Pychometric Scale for Measuring Sentiments on Twitter

abstract:
  Online social networks have become a major communication platform, where
people share their thoughts and opinions about any topic real-time. The short
text updates people post in these network contain emotions and moods, which
when measured collectively can unveil the public mood at population level and
have exciting implications for businesses, governments, and societies.
Therefore, there is an urgent need for developing solid methods for accurately
measuring moods from large-scale social media data. In this paper, we propose
PANAS-t, which measures sentiments from short text updates in Twitter based on
a well-established psychometric scale, PANAS (Positive and Negative Affect
Schedule). We test the efficacy of PANAS-t over 10 real notable events drawn
from 1.8 billion tweets and demonstrate that it can efficiently capture the
expected sentiments of a wide variety of issues spanning tragedies, technology
releases, political debates, and healthcare.


title:
The energy-spectrum of light primaries in the range from 10^{16.6} to
  10^{18.2} eV

abstract:
  Data of the Grande extension of the KASCADE experiment allows us to study
extensive air showers induced by primary cosmic rays with energies above
10^{16} eV. The energy of an event is estimated in terms of the number of
charged particles (Nch ) and the number of muons (N{\mu} ) measured at an
altitude of 110 m a.s.l. While a combination of the two numbers is used for the
energy, the ratio defines the primary mass (group). The spectrum of the
combined light and medium mass components, recently measured with
KASCADE-Grande, was found to be compatible with both a single power-law and a
broken power-law in the energy range between 10^{16.3} and 10^{18} eV. In this
contribution we will present the investigation of possible structures in the
spectrum of light primaries with increased statistics both from a larger data
set including more recent measurements and by using a larger fiducial area than
in the previous study. With the better statistical accuracy and with optimized
selection criteria for enhancing light primaries we have found evidence for a
hardening (ankle) of the spectrum of the light component at an energy of
10^{17.08+-0.08} eV.


title: A note on acoustic black holes in neo-Newtonian theory

abstract:
  Newtonian fluid dynamics allows the construction of acoustic metrics from
which black hole configurations can be studied. However, relativistic pressure
effects are neglected within Newtonian theory. We study acoustic black holes in
the framework of neo-Newtonian hydrodynamics, which is designed to take into
account relativistic inertial effects of the pressure $p$. Within this new
hydrodynamical context we show how $p$ can influence the formation of the
acoustic horizons.

categories: gr-qc astro-ph.HE hep-th physics.flu-dyn


title:
An Optimization Framework to Improve 4D-Var Data Assimilation System
  Performance

abstract:
  This paper develops a computational framework for optimizing the parameters
of data assimilation systems in order to improve their performance. The
approach formulates a continuous meta-optimization problem for parameters; the
meta-optimization is constrained by the original data assimilation problem. The
numerical solution process employs adjoint models and iterative solvers. The
proposed framework is applied to optimize observation values, data weighting
coefficients, and the location of sensors for a test problem. The ability to
optimize a distributed measurement network is crucial for cutting down
operating costs and detecting malfunctions.


title: Exact results for the low energy AdS(4)XCP(3) string theory

abstract:
  We derive the Thermodynamic Bethe Ansatz equations for the relativistic sigma
model describing the AdS(4)XCP(3) string II A theory at strong coupling (i.e.
in the Alday-Maldacena decoupling limit). The corresponding Y-system involves
an infinite number of Y functions and is of a new type, although it shares a
peculiar feature with the Y-system for AdS(4)XCP(3). A truncation of the
equations at level p and a further generalisation to generic rank N allow us an
alternative description of the theory as the N=4, p= \infty representative in
an infinite family of models corresponding to the conformal cosets CP(N-1)_p X
U(1), perturbed by a relevant composite field \phi(N,p) =\phi_[CP(N-1)_p] X
\phi[U(1)] that couples the two independent conformal field theories. The
calculation of the ultraviolet central charge confirms the conjecture by Basso
and Rej and the conformal dimension of the perturbing operator, at every N and
p, is obtained using the Y-system periodicity. The conformal dimension of
\phi[CP(N-1)_p] matches that of the field identified by Fendley while
discussing integrability issues for the purely bosonic CP(N-1) sigma model.


title: Percolation of Interdependent Networks with Inter-similarity

abstract:
  Real data show that interdependent networks usually involve inter-similarity.
Intersimilarity means that a pair of interdependent nodes have neighbors in
both networks that are also interdependent (Parshani et al \cite{PAR10B}). For
example, the coupled world wide port network and the global airport network are
intersimilar since many pairs of linked nodes (neighboring cities), by direct
flights and direct shipping lines exist in both networks. Nodes in both
networks in the same city are regarded as interdependent. If two neighboring
nodes in one network depend on neighboring nodes in the another we call these
links common links. The fraction of common links in the system is a measure of
intersimilarity. Previous simulation results suggest that intersimilarity has
considerable effect on reducing the cascading failures, however, a theoretical
understanding on this effect on the cascading process is currently missing.
Here, we map the cascading process with inter-similarity to a percolation of
networks composed of components of common links and non common links. This
transforms the percolation of inter-similar system to a regular percolation on
a series of subnetworks, which can be solved analytically. We apply our
analysis to the case where the network of common links is an
Erd\H{o}s-R\'{e}nyi (ER) network with the average degree $K$, and the two
networks of non-common links are also ER networks. We show for a fully coupled
pair of ER networks, that for any $K\geq0$, although the cascade is reduced
with increasing $K$, the phase transition is still discontinuous. Our analysis
can be generalized to any kind of interdependent random networks system.


title: Wave Front Sets of Reductive Lie Group Representations

abstract:
  If $G$ is a Lie group, $H\subset G$ is a closed subgroup, and $\tau$ is a
unitary representation of $H$, then the authors give a sufficient condition on
$\xi\in i\mathfrak{g}^*$ to be in the wave front set of
$\operatorname{Ind}_H^G\tau$. In the special case where $\tau$ is the trivial
representation, this result was conjectured by Howe. If $G$ is a real,
reductive algebraic group and $\pi$ is a unitary representation of $G$ that is
weakly contained in the regular representation, then the authors give a
geometric description of $\operatorname{WF}(\pi)$ in terms of the direct
integral decomposition of $\pi$ into irreducibles. Special cases of this result
were previously obtained by Kashiwara-Vergne, Howe, and Rossmann. The authors
give applications to harmonic analysis problems and branching problems.


title:
Remote sensing of seawater and drifting ice in Svalbard fjords by
  compact Raman LIDAR

abstract:
  A compact Raman LIDAR system for remote sensing of sea and drifting ice was
developed at the Wave Research Center at the Prokhorov General Physics
Institute of the RAS. The developed system is based on a diode pumped solid
state YVO4:Nd laser combined with compact spectrograph equipped with gated
detector. The system exhibits high sensitivity and can be used for mapping or
depth profiling of different parameters within many oceanographic problems.
Light weight (~20 kg) and low power consumption (300 W) make possible to
install the device on any vehicle including unmanned aircraft or submarine
system. The Raman LIDAR presented was used for Svalbard fjords study and
analysis of different influence of the open sea and glaciers on the water
properties. Temperature, phytoplankton, and dissolved organic matter
distributions in the seawater were studied in the Ice Fjord, Van Mijen Fjord
and Rinders Fjord. Drifting ice and seawater in the Rinders Fjord were
characterized by the Raman spectroscopy and fluorescence. It was found that the
Paula Glacier strongly influences the water temperature and chlorophyll
distributions in the Van Mijen Fjord and Rinders Fjord. Possible applications
of compact LIDAR systems for express monitoring of seawater in the places with
high concentration of floating ice or near cold streams in the Arctic Ocean are
discussed


title: ExprTarget: An Integrative Approach to Predicting Human MicroRNA Targets

abstract:
  We developed an online database, ExprTargetDB, of human miRNA targets
predicted by an approach that integrates gene expression profiling into a
broader framework involving important features of miRNA target site
predictions.


title:
Single-shot and single-spot measurement of laser ablation threshold for
  carbon nanotubes

abstract:
  A simple and convenient procedure for single-shot, single-spot ablation
threshold measurement has been developed. It is based on the employment of
cylindrical lens to obtain elliptical Gaussian laser spot. The ablated spot
chords which are parallel to the minor axis were measured across the spot major
axis which is proportional to the fluence cross-section thus providing wide
range dependence of damaged spot size versus fluence in one spot measurement.
For both conventional and new-developed procedures the ablation threshold for
typical Nd:YAG laser parameters (1064 nm, 10 ns) has been measured as 50 mJ/cm2
which is one order of magnitude lower than that for a bulk graphite.


title: Stability of Horndeski vector-tensor interactions

abstract:
  We study the Horndeski vector-tensor theory that leads to second order
equations of motion and contains a non-minimally coupled abelian gauge vector
field. This theory is remarkably simple and consists of only 2 terms for the
vector field, namely: the standard Maxwell kinetic term and a coupling to the
dual Riemann tensor. Furthermore, the vector sector respects the U(1) gauge
symmetry and the theory contains only one free parameter, M^2, that controls
the strength of the non-minimal coupling. We explore the theory in a de Sitter
spacetime and study the presence of instabilities and show that it corresponds
to an attractor solution in the presence of the vector field. We also
investigate the cosmological evolution and stability of perturbations in a
general FLRW spacetime. We find that a sufficient condition for the absence of
ghosts is M^2>0. Moreover, we study further constraints coming from imposing
the absence of Laplacian instabilities. Finally, we study the stability of the
theory in static and spherically symmetric backgrounds (in particular,
Schwarzschild and Reissner-Nordstr\"om-de Sitter). We find that the theory,
quite generally, do have ghosts or Laplacian instabilities in regions of
spacetime where the non-minimal interaction dominates over the Maxwell term. We
also calculate the propagation speed in these spacetimes and show that
superluminality is a quite generic phenomenon in this theory.


title: The extremal process of two-speed branching Brownian motion

abstract:
  We construct and describe the extremal process for variable speed branching
Brownian motion, studied recently by Fang and Zeitouni, for the case of
piecewise constant speeds; in fact for simplicity we concentrate on the case
when the speed is $\sigma_1$ for $s\leq bt$ and $\sigma_2$ when $bt\leq s\leq
t$. In the case $\sigma_1>\sigma_2$, the process is the concatenation of two
BBM extremal processes, as expected. In the case $\sigma_1<\sigma_2$, a new
family of cluster point processes arises, that are similar, but distinctively
different from the BBM process. Our proofs follow the strategy of Arguin,
Bovier, and Kistler.


title:
Space-Time Discontinuous Galerkin Solution of Convection Dominated
  Optimal Control Problems

abstract:
  In this paper, a space-time discontinuous Galerkin finite element method for
distributed optimal control problems governed by unsteady
diffusion-convection-reaction equations with control constraints is studied.
Time discretization is performed by discontinuous Galerkin method with
piecewise constant and linear polynomials, while symmetric interior penalty
Galerkin with upwinding is used for space discretization. The numerical results
presented confirm the theoretically observed convergence rates.


title: The Gamma-ray Sky with Fermi

abstract:
  Gamma rays reveal extreme, nonthermal conditions in the Universe. The Fermi
Gamma-ray Space Telescope has been exploring the gamma-ray sky for more than
four years, enabling a search for powerful transients like gamma-ray bursts,
solar flares, and flaring active galactic nuclei, as well as long-term studies
including pulsars, binary systems, supernova remnants, and searches for
predicted sources of gamma rays such as clusters of galaxies. Some results
include a stringent limit on Lorentz invariance violation derived from a
gamma-ray burst, unexpected gamma-ray variability from the Crab Nebula, a huge
gamma-ray structure in the direction of the center of our Galaxy, and strong
constraints on some Weakly Interacting Massive Particle (WIMP) models for dark
matter.