title: Power of the redshift drift on cosmological models and expansion history

abstract:
  We investigate the power of the velocity drift ($\Delta v$) on cosmological
parameters and expansion history with observational Hubble data (OHD), type Ia
supernova (SNIa). We estimate the constraints of $\Delta v$ using the Fisher
information matrix based on the model by
\citet{pasquini2005codex,whitelock2006scientific}. We find that $\Delta v$ with
20 years can reduce the uncertainty of $\Omega_m$ by more than 42% than
available observations. Based on the statistical figures of merit (FoM), we
find that in order to match the constraint power of OHD and SNIa, we need 21
and 26 future measurements, respectively. We also quantitatively estimate for
the first time the number of years required for the velocity drift to become
comparable with current observations on the equation of state $w$. The
statistical FoM indicate that we need at least 12 years to cover current
observations. Physically, we could monitor 30 quasars for 30 years to obtain
the same accuracy of $w$. Considering two parameterized deceleration factor
$q(z)$, we find that the available observations give an estimation on current
value $-0.9 \lesssim q_0 \lesssim -0.3$. Difference between the two types of
$q(z)$ is the precise determination of variation rate $dq/dz$. For the first
model with constant $dq/dz$, $\Delta v$ with only 10 years provides a much
better constraint on it, especially when compared with SNIa. However, we need
$\Delta v$ for more years in the variable $dq/dz$ model. We find that $\Delta
v$ with 30 years reduces the uncertainty of transition redshift to
approximately three times better than those of OHD and SNIa.


title:
Global well-posedness of quasilinear wave equations on asymptotically de
  Sitter spaces

abstract:
  We establish the small data solvability of suitable quasilinear wave and
Klein-Gordon equations in high regularity spaces on a geometric class of
spacetimes including asymptotically de Sitter spaces. We obtain our results by
proving the global invertibility of linear operators with coefficients in high
regularity $L^2$-based function spaces and using iterative arguments for the
non-linear problems. The linear analysis is accomplished in two parts: Firstly,
a regularity theory is developed by means of a calculus for pseudodifferential
operators with non-smooth coefficients, similar to the one developed by Beals
and Reed, on manifolds with boundary. Secondly, the asymptotic behavior of
solutions to linear equations is studied using standard b-analysis, introduced
in this context by Vasy; in particular, resonances play an important role.


title:
Interaction of laser-cooled $^{87}$Rb atoms with higher order modes of
  an optical nanofiber

abstract:
  Optical nanofibres are used to confine light to subwavelength regions and are
very promising tools for the development of optical fibre-based quantum
networks using cold, neutral atoms. To date, experimental studies on atoms near
nanofibres have focussed on fundamental fibre mode interactions. In this work,
we demonstrate the integration of a few-mode optical nanofibre into a
magneto-optical trap for $^{87}$Rb atoms. The nanofibre, with a waist diameter
of $\sim$700 nm, supports both the fundamental and first group of higher order
modes and is used for atomic fluorescence and absorption studies. In general,
light propagating in higher order fibre modes has a greater evanescent field
extension around the waist in comparison with the fundamental mode. By
exploiting this behaviour, we demonstrate that the detected signal of
fluorescent photons emitted from a cloud of cold atoms centred at the nanofibre
waist is larger ($\sim$6 times) when higher order guided modes are considered
as compared to the fundamental mode. Absorption of on-resonance, higher order
mode probe light by the laser-cooled atoms is also observed. These advances
should facilitate the realisation of atom trapping schemes based on higher
order mode interference.


title: Klein tunneling and cone transport in AA-stacked bilayer graphene

abstract:
  We investigate the quantum tunneling of electrons in an AA-stacked bilayer
graphene (BLG) $n$-$p$ junction and $n$-$p$-$n$ junction. We show that Klein
tunneling of an electron can occur in this system. The quasiparticles are not
only chiral but are additionally described by a `cone index'. Due to the
orthogonality of states with different cone indexes, electron transport across
a potential barrier must strictly conserve the cone index and this leads to the
protected cone transport which is unique in AA-stacked BLG. Together with the
negative refraction of electrons, electrons residing in different cones can be
spatially separated according to their cone index when transmitted across an
$n$-$p$ junction. This suggests the possibility of `cone-tronic' devices based
on AA-stacked BLG. Finally, we calculate the junction conductance of the
system.


title: X-ray imaging with GEMs using $100\,\mu$m thick foils

abstract:
  A simple X-ray imaging system using off-the-shelf electronics and simple
reconstruction algorithms aiming a spatial resolution of 1.7 mm ($\sim 3\,\%$
of the detector length) is described in this work. For this, two 100 cm$^2$ Gas
Electron Multiplier (GEM) foils with a thickness of 100 \mu m (2-fold thicker
than the standard ones) were immersed in a mixture of argon and carbon dioxide
(70:30). The charge readout with 2D position determination was done with
resistive charge division.
  Due to their higher thickness with respect to the standard GEMs, the 100 \mu
m thick GEM foils were found to be less prone to damage caused by the
electrical discharges.
  X-ray images are shown and some descriptions of the physical processes
involved are presented. We describe the advantages of this method that allows
counting each X-ray photon or particle entering the detector, its interaction
position, as well as measuring of its energy. The results of our present work
show a position resolution below 2 mm, being limited by the gas mixture used,
and not the detecting system, with a very good cost effectiveness. Future work
is being carried out to optimize the present system for a medical application
as a proton beam monitor.


title: Pairwise Comparisons Simplified

abstract:
  This study examines the notion of generators of a pairwise comparisons
matrix. Such approach decreases the number of pairwise comparisons from $n\cdot
(n-1)$ to $n-1$. An algorithm of reconstructing of the PC matrix from its set
of generators is presented.


title: Bayesian spike inference from calcium imaging data

abstract:
  We present efficient Bayesian methods for extracting neuronal spiking
information from calcium imaging data. The goal of our methods is to sample
from the posterior distribution of spike trains and model parameters (baseline
concentration, spike amplitude etc) given noisy calcium imaging data. We
present discrete time algorithms where we sample the existence of a spike at
each time bin using Gibbs methods, as well as continuous time algorithms where
we sample over the number of spikes and their locations at an arbitrary
resolution using Metropolis-Hastings methods for point processes. We provide
Rao-Blackwellized extensions that (i) marginalize over several model parameters
and (ii) provide smooth estimates of the marginal spike posterior distribution
in continuous time. Our methods serve as complements to standard point
estimates and allow for quantification of uncertainty in estimating the
underlying spike train and model parameters.


title: Focal ratio degradation in lightly-fused hexabundles

abstract:
  We are now moving into an era where multi-object wide-field surveys, which
traditionally use single fibres to observe many targets simultaneously, can
exploit compact integral field units in place of single fibres. Current
multi-object integral field instruments such as SAMI (Croom et al. 2012; Bryant
et al. 2012a) have driven the development of new imaging fibre bundles
(hexabundles) for multi-object spectrographs. We have characterised the
performance of hexabundles with different cladding thicknesses and compared
them to that of the same type of bare fibre, across the range of fill-fractions
and input f-ratios likely in an IFU instrument. Hexabundles with 7-cores and
61-cores were tested for focal ratio degradation (FRD), throughput and
cross-talk when fed with inputs from F/3.4 to >F/8. The five 7-core bundles
have cladding thickness ranging from 1 to 8 microns, and the 61-core bundles
have 5micron cladding. As expected, the FRD improves as the input focal ratio
decreases. We find that the FRD and throughput of the cores in the hexabundles
match the performance of single fibres of the same material at low input
f-ratios. The performance results presented can be used to set a limit on the
f-ratio of a system based on the maximum loss allowable for a planned
instrument. Our results confirm that hexabundles are a successful alternative
for fibre imaging devices for multi-object spectroscopy on wide-field
telescopes and have prompted further development of hexabundle designs with
hexagonal packing and square cores.


title:
Shifted one-parameter supersymmetric family of quartic asymmetric
  double-well potentials

abstract:
  Extending our previous work (Rosu, Mancas, Chen, Ann.Phys. 343 (2014)
87-102), we define supersymmetric partner potentials through a particular
Riccati solution of the form F(x)=(x-c)^2-1, where c is a real shift parameter,
and work out the quartic double-well family of one-parameter isospectral
potentials obtained by using the corresponding general Riccati solution. For
these parametric double well potentials, we study how the localization
properties of the two wells depend on the parameter of the potentials for
various values of the shifting parameter. We also consider the supersymmetric
parametric family of the first double-well potential in the Razavy chain of
double well potentials corresponding to F(x)=(1/2)sinh 2x-2(1+sqrt 2)sinh
2x/[(1+sqrt 2) cosh 2x+1], both unshifted and shifted, to test and compare the
localization properties


title:
The SU(1,1) Perelomov number coherent states and the non-degenerate
  parametric amplifier

abstract:
  We construct the Perelomov number coherent states for any three $su(1,1)$ Lie
algebra generators and study some of their properties. We introduce three
operators which act on Perelomov number coherent states and close the $su(1,1)$
Lie algebra. We show that the most general $SU(1,1)$ coherence-preserving
Hamiltonian has the Perelomov number coherent states as eigenfunctions, and we
obtain their time evolution. We apply our results to obtain the non-degenerate
parametric amplifier eigenfunctions, which are shown to be the Perelomov number
coherent states of the two-dimensional harmonic oscillator.


title: Dimension Reduction of Large AND-NOT Network Models

abstract:
  Boolean networks have been used successfully in modeling biological networks
and provide a good framework for theoretical analysis. However, the analysis of
large networks is not trivial. In order to simplify the analysis of such
networks, several model reduction algorithms have been proposed; however, it is
not clear if such algorithms scale well with respect to the number of nodes.
The goal of this paper is to propose and implement an algorithm for the
reduction of AND-NOT network models for the purpose of steady state
computation. Our method of network reduction is the use of "steady state
approximations" that do not change the number of steady states. Our algorithm
is designed to work at the wiring diagram level without the need to evaluate or
simplify Boolean functions. Also, our implementation of the algorithm takes
advantage of the sparsity typical of discrete models of biological systems. The
main features of our algorithm are that it works at the wiring diagram level,
it runs in polynomial time, and it preserves the number of steady states. We
used our results to study AND-NOT network models of gene networks and showed
that our algorithm greatly simplifies steady state analysis. Furthermore, our
algorithm can handle sparse AND-NOT networks with up to 1000000 nodes.


title: Networking Seifert Surgeries on Knots III

abstract:
  How do Seifert surgeries on hyperbolic knots arise from those on torus knots?
We approach this question from a networking viewpoint. The Seifert Surgery
Network is a 1-dimensional complex whose vertices correspond to Seifert
surgeries; two vertices are connected by an edge if one Seifert surgery is
obtained from the other by a single twist along a trivial knot called a
seiferter or along an annulus cobounded by seiferters. Successive twists along
a "hyperbolic seiferter" or a "hyperbolic annular pair" produce infinitely many
Seifert surgeries on hyperbolic knots. In this paper, we investigate Seifert
surgeries on torus knots which have hyperbolic seiferters or hyperbolic annular
pairs, and obtain results suggesting that such surgeries are restricted.


title: Multi-agent based protection system for distribution system with DG

abstract:
  This paper introduces the basic structure of multi-agent based protection
system for distribution system with DGs. The entire system consists of
intelligent agents and communication system. Intelligent agents can be divided
into three layers, the bottom layer, the middle layer and the upper layer. The
design of the agent in different layer is analyzed in detail. Communication
system is the bridge of multi-agent system (MAS). The transmission mode,
selective communication and other principles are discussed to improve the
transmission efficiency. Finally, some evaluations are proposed, which provides
the design of MAS with reference.


title:
Hole-burning in an Autler-Townes doublet and in superluminal
  (subluminal) Electromagnetically induced transparency of a light pulse via a
  joint nonlinear coherent Kerr effect and Doppler broadening

abstract:
  We investigate the behavior of light pulse propagation in a 4-level double
Lambda atomic system under condition of electromagnetically induced
transparency. The Fano type interference effect and spectral hole burning
appears in the the dynamics of the absorption-dispersion spectra caused by the
joint nonlinear coherence Kerr effect and Doppler broadening. The coherent Kerr
effect exhibits an enhancement (reduction) in superluminal (subluminal) in
negative (in positive) group index while the Doppler broadening generates
multiple hole burning in the Autler-Townes like spectra of this system. The
hole burning in addition with coherent Kerr effect on the spectral profile
influences the dynamics of subluminal and superluminal of the probe pulse
through the medium. The characteristics of superluminality and subluminality
modified by considering cold-Kerr-free medium and hot-Kerr-dependent mediums.
The light pulse delays and advances in different regions of dispersion medium
with the Doppler broadening and coherent Kerr effect. Consequently, the pulse
delays by $49\mu s$, while advance by $-91\mu s$, for a same set of parameters
[note: a revised version is under preparation


title: Toward inflation models compatible with the no-boundary proposal

abstract:
  In this paper, we investigate various inflation models in the context of the
no-boundary proposal. We propose that a good inflation model should satisfy
three conditions: observational constraints, plausible initial conditions, and
naturalness of the model. For various inflation models, we assign the
probability to each initial condition using the no-boundary proposal and define
a quantitative standard, typicality, to check whether the model satisfies the
observational constraints with probable initial conditions. There are three
possible ways to satisfy the typicality criterion: there was pre-inflation near
the high energy scale, the potential is finely tuned or the inflationary field
space is unbounded, or there are sufficient number of fields that contribute to
inflation. The no-boundary proposal rejects some of naive inflation models,
explains some of traditional doubts on inflation, and possibly, can have
observational consequences.


title:
Systematics of the strength of superconductivity of the d-p model in
  relation to cuprates

abstract:
  Cuprate high-Tc superconductors are known to have several relationships
between Tc and features of electronic structure. In the firstly found one, Tc
is correlated with the Madelung potential difference between planar Cu and O
sites. Another one relates Tc to the relative ratio of hole densities at the Cu
and O sites. In this work we analyze the dependences of the strength of
superconductivity (SC) on the model parameters of the d-p model. We first
transform the d-p model into a Hubbard model that proves to have k-dependent
Coulomb interaction. To this model we apply a kind of mean-field theory, i. e.,
Kondo's theory of the d-wave SC gap in cuprates. The obtained so-called SC
strength parameter increases with increase of |ep - ed| on both positive and
negative sides of ep - ed due to increase of effective on-site Coulomb
interaction U. ep and ed are hole energy levels of O2p and Cu3d orbitals
referenced to the d9 configuration. The above-mentioned two relationships are
shown to be understandable in terms of the d-wave SC, if ep - ed < 0.


title: Light Top Squark in Precision Top Quark Sample

abstract:
  The uncertainty of $t\bar{t}$ production cross section measurement at LHC is
at a-few-percent level which still allows the stop pair production
$\tilde{t}\tilde{t}^{*}$ with identical final states $2b+\ell+nj+{E}_{T}$. In
this paper, we attempt to use the existing measurement of $W$-polarization in
top quark decay to improve the distinction between stop and top quark states.
We apply the ATLAS $\chi^2$ method of $W$-polarization measurement in
semi-leptonic $t\bar{t}$ final state to semi-leptonic stop pair samples and
study its prediction. We find that the faked top events from stop mostly
contribute to the left-handed polarized $W$ due to the reconstruction. The
benchmark point with maximal contribution to top events only changes $F_{L}$ by
1%. After comparing with the current experiments, we conclude that the current
measurement of $W$-polarization in $t$ decay cannot exclude the light stop
scenario.


title: Attractive interaction between ions inside a quantum plasma structure

abstract:
  We construct the model of a quantum spherically symmetric plasma structure
based on radial oscillations of ions. We suppose that ions are involved in
ion-acoustic plasma oscillations. We find the exact solution of the
Schr\"{o}dinger equation for an ion moving in the self-consistent oscillatory
potential of an ion-acoustic wave. The system of ions is secondly quantized and
its ground state is constructed. Then we consider the interaction between ions
by the exchange of an acoustic wave. It is shown that this interaction can be
attractive. We describe the formation of pairs of ions inside a plasma
structure and demonstrate that such a plasmoid can exist in a dense
astrophysical medium corresponding to the outer core of a neutron star.


title: Want a Good Answer? Ask a Good Question First!

abstract:
  Community Question Answering (CQA) websites have become valuable repositories
which host a massive volume of human knowledge. To maximize the utility of such
knowledge, it is essential to evaluate the quality of an existing question or
answer, especially soon after it is posted on the CQA website.
  In this paper, we study the problem of inferring the quality of questions and
answers through a case study of a software CQA (Stack Overflow). Our key
finding is that the quality of an answer is strongly positively correlated with
that of its question. Armed with this observation, we propose a family of
algorithms to jointly predict the quality of questions and answers, for both
quantifying numerical quality scores and differentiating the high-quality
questions/answers from those of low quality. We conduct extensive experimental
evaluations to demonstrate the effectiveness and efficiency of our methods.


title: A Survey: Various Techniques of Image Compression

abstract:
  This paper addresses about various image compression techniques. On the basis
of analyzing the various image compression techniques this paper presents a
survey of existing research papers. In this paper we analyze different types of
existing method of image compression. Compression of an image is significantly
different then compression of binary raw data. To solve these use different
types of techniques for image compression. Now there is question may be arise
that how to image compress and which types of technique is used. For this
purpose there are basically two types are method are introduced namely lossless
and lossy image compression techniques. In present time some other techniques
are added with basic method. In some area neural network genetic algorithms are
used for image compression.
  Keywords-Image Compression; Lossless; Lossy; Redundancy; Benefits of
Compression.


title: Free actions of connected Lie groups of rank one on certain spaces

abstract:
  Let $G$ be a connected Lie group of rank one. In this paper the existence of
free actions of group $G$ on spheres, real projective spaces and lens spaces
has been studied. Most of the results have been obtained for finitistic spaces
with cohomology ring isomorphic to the cohomology ring of these spaces. The
cohomology algebra of the orbit space has been determined in the case of free
$G$-action. The non-existence of $G$-equivariant maps from spheres to
cohomology spheres has also been established.


title:
Analysis and synthesis of nonlinear reversible cellular automata in
  linear time

abstract:
  Cellular automata (CA) have been found as an attractive modeling tool for
various applications, such as, pattern recognition, image processing, data
compression, encryption, and specially for VLSI design & test. For such
applications, mostly a special class of CA, called as linear/additive CA, have
been utilized. Since linear/additive CA refer a limited number of candidate CA,
while searching for solution to a problem, the best result may not be expected.
The nonlinear CA can be a better alternative to linear/additive CA for
achieving desired solutions in different applications. However, the nonlinear
CA are yet to be characterized to fit the design for modeling an application.
This work targets characterization of the nonlinear CA to utilize the huge
search space of nonlinear CA while developing applications in VLSI domain. An
analytical framework is developed to explore the properties of CA rules. The
characterization is directed to deal with the reversibility, as the reversible
CA are primarily targeted for VLSI applications. The reported characterization
enables us to design two algorithms of linear time complexities -- one for
identification and nother for synthesis of nonlinear reversible CA. Finally,
the CA rules are classified into 6 classes for developing further efficient
synthesis algorithm.


title:
The Degrees of Freedom of the $K$-pair-user Full-Duplex Two-way
  Interference Channel with and without a MIMO Relay

abstract:
  In a $K$-pair-user two-way interference channel (TWIC), $2K$ messages and
$2K$ transmitters/receivers form a $K$-user IC in the forward direction ($K$
messages) and another $K$-user IC in the backward direction which operate in
full-duplex mode. All nodes may interact, or adapt inputs to past received
signals. We derive a new outer bound to demonstrate that the optimal degrees of
freedom (DoF, also known as the multiplexing gain) is $K$: full-duplex
operation doubles the DoF, but interaction does not further increase the DoF.
We next characterize the DoF of the $K$-pair-user TWIC with a MIMO, full-duplex
relay. If the relay is non-causal/instantaneous (at time $k$ forwards a
function of its received signals up to time $k$) and has $2K$ antennas, we
demonstrate a one-shot scheme where the relay mitigates all interference to
achieve the interference-free $2K$ DoF. In contrast, if the relay is causal (at
time $k$ forwards a function of its received signals up to time $k-1$), we show
that a full-duplex MIMO relay cannot increase the DoF of the $K$-pair-user TWIC
beyond $K$, as if no relay or interaction is present. We comment on reducing
the number of antennas at the instantaneous relay.


title:
Color and Shape Content Based Image Classification using RBF Network and
  PSO Technique: A Survey

abstract:
  The improvement of the accuracy of image query retrieval used image
classification technique. Image classification is well known technique of
supervised learning. The improved method of image classification increases the
working efficiency of image query retrieval. For the improvements of
classification technique we used RBF neural network function for better
prediction of feature used in image retrieval.Colour content is represented by
pixel values in image classification using radial base function(RBF) technique.
This approach provides better result compare to SVM technique in image
representation.Image is represented by matrix though RBF using pixel values of
colour intensity of image. Firstly we using RGB colour model. In this colour
model we use red, green and blue colour intensity values in matrix.SVM with
partical swarm optimization for image classification is implemented in content
of images which provide better Results based on the proposed approach are found
encouraging in terms of color image classification accuracy.


title: Effects of Surface Anisotropy on Magnetic Vortex Core

abstract:
  The vortex core shape in the three dimensional Heisenberg magnet is
essentially influenced by a surface anisotropy. We predict that depending of
the surface anisotropy type there appears barrel- or pillow-shaped deformation
of the vortex core along the magnet thickness. Our theoretical study is well
confirmed by spin-lattice simulations.


title:
Near-Optimal and Robust Mechanism Design for Covering Problems with
  Correlated Players

abstract:
  We consider the problem of designing incentive-compatible, ex-post
individually rational (IR) mechanisms for covering problems in the Bayesian
setting, where players' types are drawn from an underlying distribution and may
be correlated, and the goal is to minimize the expected total payment made by
the mechanism. We formulate a notion of incentive compatibility (IC) that we
call {\em support-based IC} that is substantially more robust than Bayesian IC,
and develop black-box reductions from support-based-IC mechanism design to
algorithm design. For single-dimensional settings, this black-box reduction
applies even when we only have an LP-relative {\em approximation algorithm} for
the algorithmic problem. Thus, we obtain near-optimal mechanisms for various
covering settings including single-dimensional covering problems, multi-item
procurement auctions, and multidimensional facility location.


title:
Transmission Phase in the Kondo Regime Revealed in a Two-Path
  Interferometer

abstract:
  We report on the direct observation of the transmission phase shift through a
Kondo correlated quantum dot by employing a new type of two-path
interferometer. We observed a clear $\pi/2$-phase shift, which persists up to
the Kondo temperature $T_{\rm K}$. Above this temperature, the phase shifts by
more than $\pi/2$ at each Coulomb peak, approaching the behavior observed for
the standard Coulomb blockade regime. These observations are in remarkable
agreement with 2-level numerical renormalization group calculations. The unique
combination of experimental and theoretical results presented here fully
elucidates the phase evolution in the Kondo regime.


title: Composite flavor-singlet scalar in twelve-flavor QCD

abstract:
  We report the calculation of the flavor-singlet scalar in the SU(3) gauge
theory with the degenerate twelve fermions in the fundamental representation
using a HISQ-type action at a fixed $\beta$. In order to reduce the large
statistical error coming from the vacuum-subtracted disconnected correlator, we
employ a noise reduction method and a large number of configurations. We
observe that the flavor-singlet scalar is lighter than the pion in this theory
from the calculations with the fermion bilinear and gluonic operators. This
peculiar feature is considered to be due to the infrared conformality of this
theory, and it is a promissing signal for a walking technicolor, where a light
composite Higgs boson is expected to emerge by approximate conformal dynamics.


title: Density functional theory of electrowetting

abstract:
  The phenomenon of electrowetting, i.e., the dependence of the macroscopic
contact angle of a fluid on the electrostatic potential of the substrate, is
analyzed in terms of the density functional theory of wetting. It is shown that
electrowetting is not an electrocapillarity effect, i.e., it cannot be
consistently understood in terms of the variation of the substrate-fluid
interfacial tension with the electrostatic substrate potential, but it is
related to the depth of the effective interface potential. The key feature,
which has been overlooked so far and which occurs naturally in the density
functional approach is the structural change of a fluid if it is brought into
contact with another fluid. These structural changes occur in the present
context as the formation of finite films of one fluid phase in between the
substrate and the bulk of the other fluid phase. The non-vanishing Donnan
potentials (Galvani potential differences) across such film-bulk fluid
interfaces, which generically occur due to an unequal partitioning of ions as a
result of differences of solubility contrasts, lead to correction terms in the
electrowetting equation, which become relevant for sufficiently small substrate
potentials. Whereas the present density functional approach confirms the
commonly used electrocapillarity-based electrowetting equation as a good
approximation for the cases of metallic electrodes or electrodes coated with a
hydrophobic dielectric in contact with an electrolyte solution and an ion-free
oil, a significantly reduced tendency for electrowetting is predicted for
electrodes coated with a dielectric which is hydrophilic or which is in contact
with two immiscible electrolyte solutions.


title:
Modeling Radiometric Uncertainty for Vision with Tone-mapped Color
  Images

abstract:
  To produce images that are suitable for display, tone-mapping is widely used
in digital cameras to map linear color measurements into narrow gamuts with
limited dynamic range. This introduces non-linear distortion that must be
undone, through a radiometric calibration process, before computer vision
systems can analyze such photographs radiometrically. This paper considers the
inherent uncertainty of undoing the effects of tone-mapping. We observe that
this uncertainty varies substantially across color space, making some pixels
more reliable than others. We introduce a model for this uncertainty and a
method for fitting it to a given camera or imaging pipeline. Once fit, the
model provides for each pixel in a tone-mapped digital photograph a probability
distribution over linear scene colors that could have induced it. We
demonstrate how these distributions can be useful for visual inference by
incorporating them into estimation algorithms for a representative set of
vision tasks.


title: An estimation of local bulk flow with the maximum-likelihood method

abstract:
  A maximum-likelihood method, tested as an unbiased estimator from numerical
simulations, is used to estimate cosmic bulk flow from peculiar velocity
surveys. The likelihood function is applied to four observational catalogues
(ENEAR, SFI++, A1SN and SC) constructed from galaxy peculiar velocity surveys
and Type-Ia supernovae data at low redshift ($z \leq 0.03$). We find that the
Spiral Field {\it I}-band catalogue constrains the bulk flow to be $V=290 \pm
30 {\,{\rm km}\,{\rm s}^{-1}}$ towards $l=281^{\circ} \pm 7^{\circ}$,
$b=8^{\circ +6^{\circ}}_{-5^{\circ}}$ on effective scales of $ 58 {\,{h^{-1}
{\rm Mpc}}}$, which is the tightest constraints achievable at the present time.
By comparing the amplitudes of our estimated bulk flows with theoretical
prediction, we find excellent agreement between the two. In addition,
directions of estimated bulk flows are also consistent with measurements in
other studies.


title:
The potential of Rutherford Backscattering Spectrometry for composition
  analysis of colloidal nanocrystals

abstract:
  We investigate the potential of elastic scattering of energetic ions for
compositional analysis of magnetic colloidal nanocrystals. Thin layers of
nanocrystals deposited by spin coating on Si-wafers are investigated by two
different set-ups for Rutherford Backscattering Spectrometry (RBS), employing
different projectile ions (4He, 12C) and primary energies (600 keV - 8 MeV).
The advantages and disadvantages of the different approaches are discussed in
terms of obtainable mass resolution, necessary primary particle fluence and
deposited energy. It is shown that different isotopes of transition metals can
be resolved by employing 8 MeV 12C3+ primary ions.


title: On the Plaque Expansivity Conjecture

abstract:
  It is one of the main properties of uniformly hyperbolic dynamics that points
of two distinct trajectories cannot be uniformly close one to another. This
characteristics of hyperbolic dynamics is called expansivity. Hirsch, Pugh and
Shub, 1977, formulated the so-called Plaque Expansivity Conjecture, assuming
that two invariant sequences of leaves of central manifolds, corresponding to a
partially hyperbolic diffeomorphism, cannot be locally close. There are many
important statements in the theory of partial hyperbolicity that can be proved
provided Plaque Expansivity Conjecture holds true. Here we are proving this
conjecture in its general form.


title: Phantom mass gravitational effects

abstract:
  I derive the basic relativistic corrections to the equations of motion of
test particles and light rays in the field of a source with active mass $m$,
including the phantom mass density that any such source generates when a
modification of Newton's action at a distance includes a long range term. The
technical framework of this paper is that of Einstein's theory of gravitation
at the linear approximation with respect to the mass parameter $m$.


title:
Stability of flat-band edge states in topological superconductors
  without inversion center

abstract:
  Nodal superconductors without inversion symmetry exhibit nontrivial
topological properties, manifested by topologically protected flat-band edge
states. Here we study the effects of breaking translational symmetry, crucial
to the definition of the topological invariant. We show using large-scale
numerical simulations that bulk-edge correspondence remains valid in the
presence of edge roughness and strong edge disorder. Moderately strong
nonmagnetic disorder shifts some of the edge states away from zero energy, but
does not change their total number. Strong spin-independent edge disorder, on
the other hand, leads to the appearance of new weakly disordered midgap states
in the layers adjacent to the disordered edge, i.e., at the interface between
the bulk topological superconductor and the one-dimensional Anderson insulator
formed by the strongly disordered edge layers. Furthermore, we show that
magnetic impurities, which lift the time-reversal symmetry protection of the
flat-band states, lead to a rapid decrease of the number of edge states with
increasing disorder strength.


title:
The Continuous-Pole-Expansion method to obtain spectra of electronic
  lattice models

abstract:
  We present a new algorithm to analytically continue the self-energy of
quantum many-body systems from Matsubara frequencies to the real axis. The
method allows straightforward, unambiguous computation of electronic spectra
for lattice models of strongly correlated systems from self-energy data that
has been collected with state-of-the are continuous time solvers within
dynamical mean field simulations. Using well-known analytical properties of the
self-energy, the analytic continuation is cast into a constrained minimization
problem that can be formulated as a quadratic programmable optimization with
linear constraints. The algorithm is validated against exactly solvable finite
size problems, showing that all features of the spectral function near the Femi
level are very well reproduced and coarse features are reproduced for all
energies. The method is applied to two well known lattice problems, the
two-dimensional Hubbard model at half filling where the momentum dependence of
the gap formation is studied, as well as a multi-band model of NiO, for which
the spectral function can be directly compared to experiment. Agreement with
results published results is very good.


title:
Supernova Remnant Kes 17: Efficient Cosmic Ray Accelerator inside a
  Molecular Cloud

abstract:
  Supernova remnant Kes 17 (SNR G304.6+0.1) is one of a few but growing number
of remnants detected across the electromagnetic spectrum. In this paper, we
analyze recent radio, X-ray, and gamma-ray observations of this object,
determining that efficient cosmic ray acceleration is required to explain its
broadband non-thermal spectrum. These observations also suggest that Kes 17 is
expanding inside a molecular cloud, though our determination of its age depends
on whether thermal conduction or clump evaporation is primarily responsible for
its center-filled thermal X-ray morphology. Evidence for efficient cosmic ray
acceleration in Kes 17 supports recent theoretical work that the strong
magnetic field, turbulence, and clumpy nature of molecular clouds enhances
cosmic ray production in supernova remnants. While additional observations are
needed to confirm this interpretation, further study of Kes 17 is important for
understanding how cosmic rays are accelerated in supernova remnants.


title:
Inner Heliospheric Evolution of a "Stealth" CME Derived From Multi-view
  Imaging and Multipoint In--situ observations: I. Propagation to 1 AU

abstract:
  Coronal mass ejections (CMEs) are the main driver of Space Weather.
Therefore, a precise forecasting of their likely geo-effectiveness relies on an
accurate tracking of their morphological and kinematical evolution throughout
the interplanetary medium. However, single view-point observations require many
assumptions to model the development of the features of CMEs, the most common
hypotheses were those of radial propagation and self-similar expansion. The use
of different view-points shows that at least for some cases, those assumptions
are no longer valid. From radial propagation, typical attributes that can now
been confirmed to exist are; over-expansion, and/or rotation along the
propagation axis. Understanding of the 3D development and evolution of the CME
features will help to establish the connection between remote and in-situ
observations, and hence help forecast Space Weather. We present an analysis of
the morphological and kinematical evolution of a STEREO B-directed CME on 2009
August 25-27. By means of a comprehensive analysis of remote imaging
observations provided by SOHO, STEREO and SDO missions, and in-situ
measurements recorded by Wind, ACE, and MESSENGER, we prove in this paper that
the event exhibits signatures of deflection, which are usually associated to
changes in the direction of propagation and/or also with rotation. The
interaction with other magnetic obstacles could act as a catalyst of deflection
or rotation effects. We propose, also, a method to investigate the change of
the CME Tilt from the analysis of height-time direct measurements. If this
method is validated in further work, it may have important implications for
space weather studies because it will allow infer ICME orientation.


title:
Avoidance of instability of a superluminal Gaussian light pulse via
  control of nonlinear coherence Kerr effect in a gain-assisted medium

abstract:
  We investigate nonlinear Kerr-induced coherence effect on a superluminal
probing light pulse in a gain-assisted N-type 4-level atomic system via an
intense monochromatic laser field. The dispersion exhibits a novel, interesting
and useful two-paired double gain lines processes. The system displays lossless
characteristics similar to [L. J. Wang, A. Kuzmich, A. Dogariu, Nature
\textbf{406}, 277 (2000)] but with advantages of \emph{multiple}
\textbf{controllable} anomalous regions, \emph{significantly enhanced}
superluminal behavior and \textbf{relaxed} temperature, states of matter
regardless of its isotropic or anisotropic conditions. Unlike the instability
in [A. M. Akulshin, S. Barreiro, and A. Lezama, Phys. Rev. Lett. \textbf{82},
4277 (1999)], the present system also \emph{overcomes the instable-limit} by
the Kerr-induced coherence effect in the system. Indeed, the coherence enhances
the group velocity remarkably by at least $-30 ms$ more than of an instable
Kerr-free system with almost negligible distortion in the retrieved pulse.


title:
Analyzing the Dual Space of the Saturated Ideal of a Regular Set and the
  Local Multiplicities of its Zeros

abstract:
  In this paper, we are concerned with the problem of counting the
multiplicities of a zero-dimensional regular set's zeros. We generalize the
squarefree decomposition of univariate polynomials to the so-called pseudo
squarefree decomposition of multivariate polynomials, and then propose an
algorithm for decomposing a regular set into a finite number of simple sets.
From the output of this algorithm, the multiplicities of zeros could be
directly read out, and the real solution isolation with multiplicity can also
be easily produced. As a main theoretical result of this paper, we analyze the
structure of dual space of the saturated ideal generated by a simple set as
well as a regular set. Experiments with a preliminary implementation show the
efficiency of our method.


title: Phenomenological models of Universe with varying $G$ and $\Lambda$

abstract:
  In this article we will consider several phenomenological models for the
Universe with varying $G$ and $\Lambda(t)$, where $G$ is the gravitational
"constant" and $\Lambda(t)$ is a varying cosmological "constant". Two-component
fluid model taken into account. An interaction of the phenomenological form
between a barotropic fluid and a quintessence DE is supposed. Three different
forms of $\Lambda(t)$ will be considered. The problem is analysed numerically
and behavior of different cosmological parameters investigated graphically.
Conclusion and discussions are given at the end of the work. In an Appendix an
information concerning to the other cosmological parameters is presented.


title:
General proof of the entropy principle for self-gravitating fluid in
  static spacetimes

abstract:
  We show that for any perfect fluid in a static spacetime, if the Einstein
constraint equation is satisfied and the temperature of the fluid obeys
Tolman's law, then the other components of Einstein's equation are implied by
the assumption that the total entropy of the fluid achieves an extremum for
fixed total particle number and for all variations of metric with certain
boundary conditions. Conversely, one can show that the extrema of the total
entropy of the fluid are implied by Einstein's equation. Compared to previous
works on this issue, we do not require spherical symmetry for the spacetime.
Our results suggest a general and solid connection between thermodynamics and
general relativity.


title:
Discretely exact derivatives for hyperbolic PDE-constrained optimization
  problems discretized by the discontinuous Galerkin method

abstract:
  This paper discusses the computation of derivatives for optimization problems
governed by linear hyperbolic systems of partial differential equations (PDEs)
that are discretized by the discontinuous Galerkin (dG) method. An efficient
and accurate computation of these derivatives is important, for instance, in
inverse problems and optimal control problems. This computation is usually
based on an adjoint PDE system, and the question addressed in this paper is how
the discretization of this adjoint system should relate to the dG
discretization of the hyperbolic state equation. Adjoint-based derivatives can
either be computed before or after discretization; these two options are often
referred to as the optimize-then-discretize and discretize-then-optimize
approaches. We discuss the relation between these two options for dG
discretizations in space and Runge-Kutta time integration. Discretely exact
discretizations for several hyperbolic optimization problems are derived,
including the advection equation, Maxwell's equations and the coupled
elastic-acoustic wave equation. We find that the discrete adjoint equation
inherits a natural dG discretization from the discretization of the state
equation and that the expressions for the discretely exact gradient often have
to take into account contributions from element faces. For the coupled
elastic-acoustic wave equation, the correctness and accuracy of our derivative
expressions are illustrated by comparisons with finite difference gradients.
The results show that a straightforward discretization of the continuous
gradient differs from the discretely exact gradient, and thus is not consistent
with the discretized objective. This inconsistency may cause difficulties in
the convergence of gradient based algorithms for solving optimization problems.


title:
Effects of Neutron Irradiation on Pinning Force Scaling in
  State-of-the-Art Nb3Sn Wires

abstract:
  We present an extensive irradiation study involving five state-of-the-art
Nb3Sn wires which were subjected to sequential neutron irradiation up to a fast
neutron fluence of 1.6 * 10^22 m^-2 (E > 0.1 MeV). The volume pinning force of
short wire samples was assessed in the temperature range from 4.2 to 15 K in
applied fields of up to 7 T by means of SQUID magnetometry in the unirradiated
state and after each irradiation step. Pinning force scaling computations
revealed that the exponents in the pinning force function differ significantly
from those expected for pure grain boundary pinning, and that fast neutron
irradiation causes a substantial change in the functional dependence of the
volume pinning force. A model is presented, which describes the pinning force
function of irradiated wires using a two-component ansatz involving a
point-pinning contribution stemming from radiation induced pinning centers. The
dependence of this point-pinning contribution on fast neutron fluence appears
to be a universal function for all examined wire types.


title:
Good, Better, Best! - Unbeatable Protocols for Consensus and Set
  Consensus

abstract:
  While the very first consensus protocols for the synchronous model were
designed to match the worst-case lower bound, deciding in exactly t+1 rounds in
all runs, it was soon realized that they could be strictly improved upon by
early stopping protocols. These dominate the first ones, by always deciding in
at most t+1 rounds, but often much faster. A protocol is unbeatable if it can't
be strictly dominated. Unbeatability is often a much more suitable notion of
optimality for distributed protocols than worst-case performance. Using a
knowledge-based analysis, this paper studies unbeatability for both consensus
and k-set consensus. We present unbeatable solutions to non-uniform consensus
and k-set consensus, and uniform consensus in synchronous message-passing
contexts with crash failures.
  The k-set consensus problem is much more technically challenging than
consensus, and its analysis has triggered the development of the topological
approach to distributed computing. Worst-case lower bounds for this problem
have required either techniques based on algebraic topology, or reduction-based
proofs. Our proof of unbeatability is purely combinatorial, and is a direct,
albeit nontrivial, generalization of the one for consensus. We also present an
alternative topological unbeatability proof that allows to understand the
connection between the connectivity of protocol complexes and the decision time
of processes.
  For the synchronous model, only solutions to the uniform variant of k-set
consensus have been offered. Based on our unbeatable protocols for uniform
consensus and for non-uniform k-set consensus, we present a uniform k-set
consensus protocol that strictly dominates all known solutions to this problem
in the synchronous model.


title: Locally finite groups with bounded centralizer chains

abstract:
  The c-dimension of a group G is the maximal length of a chain of nested
centralizers in G. We prove that a locally finite group of finite c-dimension k
has less than 5k nonabelian composition factors.


title:
Clear evidence for the early triggering of a luminous quasar-like AGN in
  a major, gas rich merger

abstract:
  We present deep, intermediate resolution, long slit Gemini GMOS-S optical
spectra of the SDSS type II quasar J002531-104022, which is a highly disturbed
system currently undergoing a major merger event. We use these data to model
the ages and reddenings of the stellar populations in three distinct spatial
regions and find a remarkable uniformity in the properties of the young stellar
populations (YSP) that dominate the optical spectra. The YSPs are all found to
have relatively young ages (tysp < 40$ Myr), strongly implying that the latest
episode of star formation and quasar activity have been triggered
quasi-simultaneously. The lack of reddening deduced from both continuum
modelling and the measured Balmer decrements (E(B-V) <0.3) suggests that
starburst and/or AGN induced outflows have already effectively removed a
substantial proportion of the gas and dust from the central region. These
findings starkly contrast with model predictions which suggest an offset of a
few 100 Myr between the peak of merger induced star formation and the emergence
of the optically visible quasar activity. Based on our stellar population fits
we also show that the total stellar mass is in the range (4 - 17) X 10^10 solar
masses, lower than typically found for quasar host galaxies.


title:
Holonomic modules associated with multivariate normal probabilities of
  polyhedra

abstract:
  The probability content of a convex polyhedron with a multivariate normal
distribution can be regarded as a real analytic function. We give a system of
linear partial differential equations with polynomial coefficients for the
function and show that the system induces a holonomic module. The rank of the
holonomic module is equal to the number of nonempty faces of the convex
polyhedron, and we provide an explicit Pfaffian equation (an integrable
connection) that is associated with the holonomic module. These are
generalizations of results for the Schl\"afli function that were given by
Aomoto.


title:
Periodic Points and the Measure of Maximal Entropy of an Expanding
  Thurston Map

abstract:
  In this paper, we show that each expanding Thurston map $f : S^2\rightarrow
S^2$ has $1+ deg f$ fixed points, counted with appropriate weight, where $ deg
f$ denotes the topological degree of the map $f$. We then prove the
equidistribution of preimages and of (pre)periodic points with respect to the
unique measure of maximal entropy $\mu_f$ for $f$. We also show that
$(S^2,f,\mu_f)$ is a factor of the left shift on the set of one-sided infinite
sequences with its measure of maximal entropy, in the category of
measure-preserving dynamical systems. Finally, we prove that $\mu_f$ is almost
surely the weak$^*$ limit of atomic probability measures supported on a random
backward orbit of an arbitrary point.


title:
A Constraint Programming Approach for Mining Sequential Patterns in a
  Sequence Database

abstract:
  Constraint-based pattern discovery is at the core of numerous data mining
tasks. Patterns are extracted with respect to a given set of constraints
(frequency, closedness, size, etc). In the context of sequential pattern
mining, a large number of devoted techniques have been developed for solving
particular classes of constraints. The aim of this paper is to investigate the
use of Constraint Programming (CP) to model and mine sequential patterns in a
sequence database. Our CP approach offers a natural way to simultaneously
combine in a same framework a large set of constraints coming from various
origins. Experiments show the feasibility and the interest of our approach.


title:
The problematically short superwind of OH/IR stars - Probing the outflow
  with the 69 {\mu}m spectral band of forsterite

abstract:
  Spectra of OH/IR stars show prominent spectral bands of crystalline olivine
(Mg$_{(2-2x)}$Fe$_{(2x)}$SiO$_{4}$). To learn more about the timescale of the
outflows of OH/IR stars, we study the spectral band of crystalline olivine at
69 {\mu}m. The 69 {\mu}m band is of interest because its width and peak
wavelength position are sensitive to the grain temperature and to the exact
composition of the crystalline olivine. With Herschel/PACS, we observed the 69
{\mu}m band in the outflow of 14 OH/IR stars. By comparing the crystalline
olivine features of our sample with those of model spectra, we determined the
size of the outflow and its crystalline olivine abundance.
  The temperature indicated by the observed 69 {\mu}m bands can only be
reproduced by models with a geometrically compact superwind
($R_{\rm{SW}}\lesssim$ 2500 AU = 1400 R$_{*}$).This means that the superwind
started less than 1200 years ago (assuming an outflow velocity of 10 km/s). The
small amount of mass lost in one superwind and the high progenitor mass of the
OH/IR stars introduce a mass loss and thus evolutionary problem for these
objects, which has not yet been understood.


title: Growth-induced blisters in a circular tube

abstract:
  The growth of an elastic film adhered to a confining substrate might lead to
the formation of delimitation blisters. Many results have been derived when the
substrate is flat. The equilibrium shapes, beyond small deformations, are
determined by the interplay between the sheet elastic energy and the adhesive
potential due to capillarity. Here, we study a non-trivial generalization to
this problem and consider the adhesion of a growing elastic loop to a confining
\emph{circular} substrate. The fundamental equations, i.e., the Euler Elastica
equation, the boundary conditions and the transversality condition, are derived
from a variational procedure. In contrast to the planar case, the curvature of
the delimiting wall appears in the transversality condition, thus acting as a
further source of adhesion. We provide the analytic solution to the problem
under study in terms of elliptic integrals and perform the numerical and the
asymptotic analysis of the characteristic lengths of the blister. Finally, and
in contrast to previous studies, we also discuss the mechanics and the internal
stresses in the case of vanishing adhesion. Specifically, we give a theoretical
explanation to the observed divergence of the mean pressure exerted by the
strip on the container in the limit of small excess-length.


title: Minimal Supersolutions of Convex BSDEs under Constraints

abstract:
  We study supersolutions of a backward stochastic differential equation, the
control processes of which are constrained to be continuous semimartingales of
the form $dZ = {\Delta}dt + {\Gamma}dW$. The generator may depend on the
decomposition $({\Delta},{\Gamma})$ and is assumed to be positive, jointly
convex and lower semicontinuous, and to satisfy a superquadratic growth
condition in ${\Delta}$ and ${\Gamma}$. We prove the existence of a
supersolution that is minimal at time zero and derive stability properties of
the non-linear operator that maps terminal conditions to the time zero value of
this minimal supersolution such as monotone convergence, Fatou's lemma and
$L^1$-lower semicontinuity. Furthermore, we provide duality results within the
present framework and thereby give conditions for the existence of solutions
under constraints.


title:
The Staggered Six-Vertex Model: Conformal Invariance and Corrections to
  Scaling

abstract:
  We study the emergence of non-compact degrees of freedom in the low energy
effective theory for a class of $\mathbb{Z}_2$-staggered six-vertex models. In
the finite size spectrum of the vertex model this shows up through the
appearance of a continuum of critical exponents. To analyze this part of the
spectrum we derive a set of coupled nonlinear integral equations from the Bethe
ansatz solution of the vertex model which allow to compute the energies of the
system for a range of anisotropies and of the staggering parameter. The
critical theory is found to be independent of the staggering. Its spectrum and
density of states coincide with the $SL(2,\mathbb{R})/U(1)$ Euclidean black
hole conformal field theory which has been identified previously in the
continuum limit of the vertex model for a particular 'self-dual' choice of the
staggering. We also study the asymptotic behaviour of subleading corrections to
the finite size scaling and discuss our findings in the context of the
conformal field theory.

categories: cond-mat.stat-mech hep-th math-ph math.MP


title:
Optical variability of the accretion disk around the intermediate mass
  black hole ESO 243-49 HLX-1 during the 2012 outburst

abstract:
  We present dedicated quasi-simultaneous X-ray (Swift) and optical (Very Large
Telescope (VLT), V- and R-band) observations of the intermediate mass black
hole candidate ESO 243-49 HLX-1 before and during the 2012 outburst. We show
that the V-band magnitudes vary with time, thus proving that a portion of the
observed emission originates in the accretion disk. Using the first quiescent
optical observations of HLX-1, we show that the stellar population surrounding
HLX-1 is fainter than V~25.1 and R~24.2. We show that the optical emission may
increase before the X-ray emission consistent with the scenario proposed by
Lasota et al. (2011) in which the regular outbursts could be related to the
passage at periastron of a star circling the intermediate mass black hole in an
eccentric orbit, which triggers mass transfer into a quasi-permanent accretion
disk around the black hole. Further, if there is indeed a delay in the X-ray
emission we estimate the mass-transfer delivery radius to be ~1e11 cm.


title:
In-gas-cell laser ionization spectroscopy in the vicinity of 100Sn:
  Magnetic moments and mean-square charge radii of N=50-54 Ag

abstract:
  In-gas-cell laser ionization spectroscopy studies on the neutron deficient
97-101Ag isotopes have been performed with the LISOL setup. Magnetic dipole
moments and mean-square charge radii have been determined for the first time
with the exception of 101Ag, which was found in good agreement with previous
experimental values. The reported results allow tentatively assigning the spin
of 97,99Ag to 9/2 and confirming the presence of an isomeric state in these two
isotopes, whose collapsed hyperfine structure suggests a spin of 1/2 . The
effect of the N=50 shell closure is not only manifested in the magnetic moments
but also in the evolution of the mean-square charge radii of the isotopes
investigated, in accordance with the spherical droplet model predictions.


title: Model-based clock synchronization protocol for wireless sensor networks

abstract:
  In a wireless sensor network, nodes communicate time-stamped packets in order
to synchronize their clocks, i.e., estimate each other's time display. We
introduce and analyze a parametrized stochastic model for clocks and use it to
calculate, at any given time, the Maximum-Likelihood (ML) estimate of the
relative skew/offset between two communicating nodes. For network
synchronization, event-based Kalman-Bucy filtering gives rise to a centralized
scheme, and we propose an efficient distributed suboptimal algorithm. We study
the performance both analytically and experimentally and provide provable
guarantees. We summarize our findings into defining a new distributed
model-based clock synchronization protocol (MBCSP), and present a comparative
simulation study of its accuracy versus prior art to showcase improvements.


title:
Quasi-2D $J_1$-$J_2$ Antiferromagnet $Zn_2VO(PO_4)_2$ and its
  $Ti$-substituted Derivative - A Spin-wave Analysis

abstract:
  In this study, we present non-linear spin wave analysis of a quasi 2D
spin-$\frac{1}{2}$ $J_1-J_2$ antiferromagnet at the parameter regime relevant
for the recently studied compound $Zn_2VO(PO_4)_2$. We obtain the temperature
dependence of the spin wave energy, susceptibility and magnetization using
Green's function technique and Hartree-Fock factorization or Tyablikov's
decoupling approximation. The comparison of our numerical results with the
experimental findings is discussed. Magnetic structure factor is calculated and
compared with powder neutron diffraction data. We also study the spin wave
behavior of the compound $Zn_2Ti_{0.25}V_{0.75}O(PO_4)_2$ obtained by partial
chemical substitution of $Ti$ at $V$ sites of the compound $Zn_2VO(PO_4)_2$
(Phys. Rev. B87, 054431). Due to the superlattice structure of the spin
lattice, the substituted compound possess multiple spin wave modes. The spin
wave analysis confirms the quasi-1D nature of the substituted system.


title: Spectral Compressive Sensing with Model Selection

abstract:
  The performance of existing approaches to the recovery of frequency-sparse
signals from compressed measurements is limited by the coherence of required
sparsity dictionaries and the discretization of frequency parameter space. In
this paper, we adopt a parametric joint recovery-estimation method based on
model selection in spectral compressive sensing. Numerical experiments show
that our approach outperforms most state-of-the-art spectral CS recovery
approaches in fidelity, tolerance to noise and computation efficiency.


title: On transition of non-stationary waves

abstract:
  The probability of the events that the final states are detected with or
interact with the nucleus in a finite time interval T was found to be, $P=\text
T \Gamma_0 +P^{(d)}$. $\Gamma_0$ is computed with Fermi's golden rule, and does
not depend on the nuclear wave functions. $P^{(d)}$ is not given by Fermi's
golden rule, and depends on the nuclear wave functions. In the electron mode of
pion decays, $\Gamma_0$ is proportional to $m_e^2$ but $P^{(d)}$ for the event
that the neutrino is detected is proportional to $m_{\nu}^{-2}$. $P^{(d)}$ does
not hold the helicity suppression satisfied in $\Gamma_0$ and is inevitable in
non-stationary quantum phenomena.


title:
Radio Detections During Two State Transitions of the Intermediate Mass
  Black Hole HLX-1

abstract:
  Relativistic jets are streams of plasma moving at appreciable fractions of
the speed of light. They have been observed from stellar mass black holes
($\sim$3$-$20 solar masses, M$_\odot$) as well as supermassive black holes
($\sim$10$^6$$-$10$^9$ M$_\odot$) found in the centres of most galaxies. Jets
should also be produced by intermediate mass black holes ($\sim$10$^2$$-$10$^5$
M$_\odot$), although evidence for this third class of black hole has until
recently been weak. We report the detection of transient radio emission at the
location of the intermediate mass black hole candidate ESO 243-49 HLX-1, which
is consistent with a discrete jet ejection event. These observations also allow
us to refine the mass estimate of the black hole to be between $\sim$9
$\times$10$^{3}$ M$_\odot$ and $\sim$9 $\times$10$^{4}$ M$_\odot$.


title: Birational Spaces

abstract:
  In this paper we construct the category of birational spaces as the category
in which Temkin's relative Riemann-Zariski spaces are naturally included.
Furthermore we develop an analogue of Raynaud's theory. We prove that the
category of quasi-compact and quasi-separated birational spaces is naturally
equivalent to the localization of the category of pairs of quasi-compact and
quasi-separated schemes with an affine schematically dominant morphism between
them localized with respect to relative blow ups and relative normalizations.


title: Searches for CP violation in charm decays at BABAR

abstract:
  In the Standard Model \CP violation in charm decays is expected to be very
small, at the level of 0.1% or less. A significant excess of \CP violation with
respect to the Standard Model predictions would be a signature of new physics.
We report on recent searches for \CP violation in charm meson decays at \babar,
using a data sample corresponding to an integrated luminosity of about 470
\invfb. In particular, we report on searches for \CPV in the 3-body
$\Dp\to\Kp\Km\pip$ decay and for decay modes with a \KS in the final state,
such as $\Dp\to\KS\Kp$, $\Ds\to\KS\Kp$, $\Ds\to\KS\pip$. A lifetime ratio
analysis of $\Dz\to\Kp\Km, \pip\pim$ with respect to $\Dz\to\Km\pip$ decays,
which is sensitive to \Dz-\Dzb mixing and \CP violation, is also presented
here.


title:
Superluminal light propagation in a bi-chromatically Raman-driven and
  Doppler-broadened N-type 4-level atomic system

abstract:
  We investigate the behavior of fast light pulse propagation in an N-type
Doppler-broadened 4-level atomic system using double Raman gain processes. This
system displays novel and interesting results of two controllable pairs of the
double gain lines profile with a control field. The detailed physics of the
processes are explored having multiple controllable anomalous regions in the
medium. In this set up, the system exhibits significant enhancement in the
probing Gaussian pulse through the medium as compared with Ref. [L. J. Wang, A.
Kuzmich, and A. Dogariu, Nature \textbf{406}, 227(2000)]. The advance time of
the retrieved Gaussian pulse is always greater than the advance time studied in
the above said experiment. We analyzed that the pulse propagating through the
medium with larger negative group index, $7.32\times10^8$, leaves the medium
almost undistorted and sooner by time $76.12 \ ms$ than the pulse which leaves
the medium of Wang \emph{et al.}. The Gaussian pulse always remains almost
undistorted at output due to lossless characteristic of the medium. We also
underlined the ways to suppress incoherences generated by the
Doppler-broadening effect in the system. The limitations of the recently
developed applications require to explore mechanisms for ultimate speed of a
superluminal probe light pulse. In this connection, the proposed scheme may be
helpful and can be easily adjusted with the current technology.


title:
Structure and substructure analysis of DAFT/FADA galaxy clusters in the
  [0.4-0.9] redshift range

abstract:
  We analyse the structures of all the clusters in the DAFT/FADA survey for
which XMM-Newton and/or a sufficient number of galaxy redshifts in the cluster
range is available, with the aim of detecting substructures and evidence for
merging events. These properties are discussed in the framework of standard
cold dark matter cosmology.XMM-Newton data were available for 32 clusters, for
which we derive the X-ray luminosity and a global X-ray temperature for 25 of
them. For 23 clusters we were able to fit the X-ray emissivity with a
beta-model and subtract it to detect substructures in the X-ray gas. A
dynamical analysis based on the SG method was applied to the clusters having at
least 15 spectroscopic galaxy redshifts in the cluster range: 18 X-ray clusters
and 11 clusters with no X-ray data. Only major substructures will be detected.
Ten substructures were detected both in X-rays and by the SG method. Most of
the substructures detected both in X-rays and with the SG method are probably
at their first cluster pericentre approach and are relatively recent infalls.
We also find hints of a decreasing X-ray gas density profile core radius with
redshift. The percentage of mass included in substructures was found to be
roughly constant with redshift with values of 5-15%, in agreement both with the
general CDM framework and with the results of numerical simulations. Galaxies
in substructures show the same general behaviour as regular cluster galaxies;
however, in substructures, there is a deficiency of both late type and old
stellar population galaxies. Late type galaxies with recent bursts of star
formation seem to be missing in the substructures close to the bottom of the
host cluster potential well. However, our sample would need to be increased to
allow a more robust analysis.


title:
Asymptotics of random processes with immigration II: convergence to
  stationarity

abstract:
  Let $X_1, X_2,\ldots$ be random elements of the Skorokhod space
$D(\mathbb{R})$ and $\xi_1, \xi_2, \ldots$ positive random variables such that
the pairs $(X_1,\xi_1), (X_2,\xi_2),\ldots$ are independent and identically
distributed. We call the random process $(Y(t))_{t \in \mathbb{R}}$ defined by
$Y(t):=\sum_{k \geq 0}X_{k+1}(t-\xi_1-\ldots-\xi_k)1_{\{\xi_1+\ldots+\xi_k\leq
t\}}$, $t\in\mathbb{R}$ random process with immigration at the epochs of a
renewal process. Assuming that $X_k$ and $\xi_k$ are independent and that the
distribution of $\xi_1$ is nonlattice and has finite mean we investigate weak
convergence of $(Y(t))_{t\in\mathbb{R}}$ as $t\to\infty$ in $D(\mathbb{R})$
endowed with the $J_1$-topology. The limits are stationary processes with
immigration.


title:
Scattering of a charged particle from a hard cylindrical solenoid:
  Aharonov-Bohm Effect

abstract:
  The scattering amplitude of a charged particle from a long hard cylinderical
solenoid is derived by solving the time independent Schr\"{o}dinger equation on
a double connected plane. It is a summation over the angular momentum quantum
number (partial wave summation). It is shown that only negative mechanical
angular momenta contribute to the amplitude when the radius of the solenoid
goes to zero limit without varying the magnetic induction flux (Flux line).
Original Aharonov-Bohm result is obtained with this limit.


title:
Nonadiabatic couplings and gauge-theoretical structure of curved quantum
  waveguides

abstract:
  We investigate the quantum mechanics of a single particle constrained to move
along an arbitrary smooth reference curve by a confinement that is allowed to
vary along the waveguide. The Schr\"odinger equation is evaluated in the
adapted coordinate frame and a transverse mode decomposition is performed,
taking into account both curvature and torsion effects and the possibility of a
cross-section potential that changes along the curve in an arbitrary way. We
discuss the adiabatic structure of the problem, and examine nonadiabatic
couplings that arise due to the curved geometry, the varying transverse profile
and their interplay. The exact multi-mode matrix Hamiltonian is taken as the
natural starting point for few-mode approximations. Such approximate equations
are provided, and it is worked out how these recover known results for twisting
waveguides and can be applied to other types of waveguide designs. The quantum
waveguide Hamiltonian is recast into a form that clearly illustrates how it
generalizes the Born-Oppenheimer Hamiltonian encountered in molecular physics.
In analogy to the latter, we explore the local gauge structure inherent to the
quantum waveguide problem and suggest the usefulness of diabatic states, giving
an explicit construction of the adiabatic-to-diabatic basis transformation.


title:
On the asymptotic formulae for some multiplicative functions in short
  intervals

abstract:
  In this paper we prove the mean values of some multiplicative functions
connected with the divisor function on the short interval of summation.


title: Entanglement creation in a quantum dot-nanocavity system

abstract:
  We explore the possibility to entangle an excitonic two-level system in a
semiconductor quantum dot (QD) with a cavity defined on a photonic crystal by
sweeping the cavity frequency across its resonance with the exciton transition.
The dynamic cavity detuning is established by a radio frequency surface
acoustic wave (SAW). It induces Landau-Zener (LZ) transitions between the
excitonic and the photonic degrees of freedom and thereby creates a
superposition state. We optimize this scheme by using tailored
Fourier-synthesized SAW pulses with up to five harmonics. The theoretical study
is performed with a master equation approach for present state-of-the-art
setups. Assuming experimentally demonstrated system parameters, we demonstrate
that the composed pulses increase both the maximum entanglement and its
persistence. The latter is only limited by the dominant dephasing mechanism;
i.e., the photon loss from the cavity.


title: Characterizations of Slant Ruled Surfaces in the Euclidean 3-space

abstract:
  In this study, we give the relationships between the conical curvatures of
ruled surfaces drawn by the unit vectors of the ruling, central normal and
central tangent of a regular ruled surface in the Euclidean -space. We obtain
the differential equations characterizing slant ruled surfaces and if the
reference ruled surface is a slant ruled surface, we give some conditions for
the surfaces drawn by the central normal and the central tangent vectors to be
slant ruled surfaces.


title: Illustrating the Mezzo programming language

abstract:
  When programmers want to prove strong program invariants, they are usually
faced with a choice between using theorem provers and using traditional
programming languages. The former requires them to provide program proofs,
which, for many applications, is considered a heavy burden. The latter provides
less guarantees and the programmer usually has to write run-time assertions to
compensate for the lack of suitable invariants expressible in the type system.
  We introduce Mezzo, a programming language in the tradition of ML, in which
the usual concept of a type is replaced by a more precise notion of a
permission. Programs written in Mezzo usually enjoy stronger guarantees than
programs written in pure ML. However, because Mezzo is based on a type system,
the reasoning requires no user input. In this paper, we illustrate the key
concepts of Mezzo, highlighting the static guarantees our language provides.


title: An exact renormalization formula for the Maryland model

abstract:
  We discuss the difference Schr\"odinger equation
$\psi_{k+1}+\psi_{k-1}+\lambda \cot(\pi\omega k+\theta)\psi_k=E\psi_k$,
$k\in\mathbb{Z}$, where $\lambda$, $\omega$, $\theta$ and $E$ are parameters.
We obtain explicit renormalization formulas relating its solutions for large
$|k|$ to solutions of the equation with new parameters $\lambda$, $\omega$,
$\theta$ and $E$ for bounded $|k|$. These formulas are similar to the
renormalization formulas from the theory of Gaussian exponential sums.


title: Lattice results for $D/D_s$ leptonic and semileptonic decays

abstract:
  This review article summarizes recent lattice QCD results for $D$ and $D_s$
meson leptonic and semileptonic decays. Knowing the meson decay constants and
semileptonic form factors from theory, one can extract CKM elements $V_{cd}$
and $V_{cs}$ from experimental results. At present, the most accurate results
for decay constants are from the Fermilab Lattice and MILC Collaborations: $f_D
= 212.5 \pm 0.5_{\mathrm{stat}} {}^{+0.6}_{-1.5} |_{\mathrm{syst}}$ MeV and
$f_{D_s} = 248.9 \pm 0.2_{\mathrm{stat}} {}^{+0.5}_{-1.6}|_{\mathrm{syst}}$
MeV, giving $V_{cd} = 0.2184 \pm 0.009_{\mathrm{expt}} {}^{+0.0008}_{-0.0016}
|_{\mathrm{lattice}}$ and $V_{cs} = 1.017 \pm 0.02_{\mathrm{expt}}
{}^{+0.002}_{-0.007} |_{\mathrm{lattice}}$. The shapes of the semileptonic form
factors from lattice QCD agree very well with experiment, and the accuracy is
currently at the 2-5% level for $D \to \pi\ell\nu$ and 1-2% for $D \to
K\ell\nu$. Extracting the CKM elements from the semileptonic decays yields
$V_{cd} = 0.225(6)_{\mathrm{expt}}(10)_{\mathrm{lattice}}$ (HPQCD
Collaboration) and $V_{cs} = 0.963(5)_{\mathrm{expt}}(14)_{\mathrm{lattice}}$
(HPQCD Collaboration). These lattice calculations also revealed that the
semileptonic form factors are insensitive to whether the spectator quark is a
light or strange quark.


title: A novel framework for image forgery localization

abstract:
  Image forgery localization is a very active and open research field for the
difficulty to handle the large variety of manipulations a malicious user can
perform by means of more and more sophisticated image editing tools. Here, we
propose a localization framework based on the fusion of three very different
tools, based, respectively, on sensor noise, patch-matching, and machine
learning. The binary masks provided by these tools are finally fused based on
some suitable reliability indexes. According to preliminary experiments on the
training set, the proposed framework provides often a very good localization
accuracy and sometimes valuable clues for visual scrutiny.


title:
Attaining High-performing Software Teams with Agile and Lean Practices:
  An Empirical Case Study

abstract:
  This paper presents an empirical study on how self- organized software teams
could attain high performance using agile and lean practices. In particular,
the paper qualitatively examines characteristics of high performance and self-
organization in one project team. The case under study is a customer-driven
student project, carried out to develop an alpha-version prototype. The paper
also studies how certain agile software practices aid in initialising
self-organization in the team. The main results indicate that self-organization
as supported by certain Agile and Lean practices helps teams in achieving
higher performance.


title:
Image forgery detection based on the fusion of machine learning and
  block-matching methods

abstract:
  Dense local descriptors and machine learning have been used with success in
several applications, like classification of textures, steganalysis, and
forgery detection. We develop a new image forgery detector building upon some
descriptors recently proposed in the steganalysis field suitably merging some
of such descriptors, and optimizing a SVM classifier on the available training
set. Despite the very good performance, very small forgeries are hardly ever
detected because they contribute very little to the descriptors. Therefore we
also develop a simple, but extremely specific, copy-move detector based on
region matching and fuse decisions so as to reduce the missing detection rate.
Overall results appear to be extremely encouraging.


title:
Steady periodic water waves with unbounded vorticity: equivalent
  formulations and existence results

abstract:
  In this paper we consider the steady water wave problem for waves that
possess a merely $L_r-$integrable vorticity, with $r\in(1,\infty)$ being
arbitrary. We first establish the equivalence of the three formulations--the
velocity formulation, the stream function formulation, and the height function
formulation-- in the setting of strong solutions, regardless of the value of
$r$. Based upon this result and using a suitable notion of weak solution for
the height function formulation, we then establish, by means of local
bifurcation theory, the existence of small amplitude capillary and
capillary-gravity water waves with a $L_r-$integrable vorticity.


title: Renormalization for free harmonic oscillators

abstract:
  We introduce a model of free harmonic oscillators that requires
renormalization. The model is similar to but simpler than the soluble Lee
model. We introduce two concrete examples: the first, resembling the three
dimensional $\phi^4$ theory, needs only mass renormalization, and the second,
resembling the four dimensional $\phi^4$ theory and the Lee model, needs
additional renormalization of a coupling and a wave function.


title: Multi-centered black holes with a negative cosmological constant

abstract:
  We present a recipe that allows to construct multi-centered black holes
embedded in an arbitrary FLRW universe. These solutions are completely
determined by a function satisfying the conformal Laplace equation on the
spatial slices $\text{E}^3$, $\text{S}^3$ or $\text{H}^3$. Since anti-de Sitter
space can be written in FLRW coordinates, this includes as a special case
multi-centered black holes in AdS, in the sense that, far away from the black
holes, the energy density and the pressure approach the values given by a
negative cosmological constant. We study in some detail the physical properties
of the single-centered asymptotically AdS case, which does not coincide with
the usual Reissner-Nordstr\"om-AdS black hole, but is highly dynamical. In
particular, we determine the curvature singularities and trapping horizons of
this solution, compute the surface gravity of the trapping horizons, and show
that the generalized first law of black hole dynamics proposed by Hayward holds
in this case. It turns out that the spurious big bang/big crunch singularities
that appear when one writes AdS in FLRW form, become real in presence of these
dynamical black holes. This implies that actually only one point of the usual
conformal boundary of AdS survives in the solutions that we construct. Finally,
a generalization to arbitary dimension is also presented.


title:
Superconvergence of Discontinuous Galerkin method for linear hyperbolic
  equations

abstract:
  In this paper, we study superconvergence properties of the discontinuous
Galerkin (DG) method for one-dimensional linear hyperbolic equation when upwind
fluxes are used. We prove, for any polynomial degree $k$, the $2k+1$th (or
$2k+1/2$th) superconvergence rate of the DG approximation at the downwind
points and for the domain average under quasi-uniform meshes and some suitable
initial discretization. Moreover, we prove that the derivative approximation of
the DG solution is superconvergent with a rate $k+1$ at all interior left Radau
points. All theoretical finding are confirmed by numerical experiments.


title:
Inhomogeneous viscous fluids in FRW universe and finite-future time
  singularities

abstract:
  We consider inhomogeneous viscous fluids in flat Friedmann-Robertson-Walker
universe. We analyze different kinds of such fluids and investigate the
possibility to reproduce the current cosmic acceleration providing a different
future evolution with respect to the Cosmological Constant case. In particular,
we study the presence of finite-future time singularities. We also discuss a
general class of "integrable" viscous fluid models whose bulk viscosities obey
to a common differential equation.


title:
Search in 8 TeV proton-proton collisions with the MoEDAL
  monopole-trapping test array

abstract:
  The magnetic monopole appears in theories of spontaneous gauge symmetry
breaking and its existence would explain the quantisation of electric charge.
MoEDAL is the latest approved LHC experiment, designed to search directly for
monopoles produced in high-energy collisions. It has now taken data for the
first time. The MoEDAL detectors are based on two complementary techniques:
nuclear-track detectors are sensitive to the high-ionisation signature expected
from a monopole, and the magnetic monopole trapper (MMT) relies on the stopping
and trapping of monopoles inside an aluminium array which is then analysed with
a superconducting magnetometer. The first results obtained with the MoEDAL MMT
test array deployed in 2012 are presented. This experiment probes monopoles
carrying a multiple of the fundamental unit magnetic charge for the first time
at the LHC.


title: Large-scale simulations with chiral symmetry

abstract:
  We carry out a comparative study among five-dimensional formulations of
chirally symmetric fermions about the algorithmic performance, chiral symmetry
violation and topological tunneling to find a computationally inexpensive
formulation with good chiral symmetry. With our choice of the lattice action,
we have launched large-scale simulations on fine lattices aiming at a precision
study of light and heavy quark physics. We report on the comparative study,
current status of the large-scale simulations, and preliminary results on the
residual quark mass and auto-correlation.


title: A note on the spinor construction of Spin Foam amplitudes

abstract:
  I discuss the use of spinors in the construction of spin-foam models, in
particular the form of the closure and simplicity constraints for triangles
that are space-like, i.e. with (area)$^2=\half S^{IJ}S_{IJ}>0$, regardless of
whether they belong the tetrahedra with a space-like or time-like normal,
emphasizing the role of the light-like 4-vector $u_t\sigma^I\bar u_t$. In the
quantization of the model, with the representations of SL(2,$\mathbb{C}$)
acting on spaces of functions of light-like vectors, one may use the canonical
basis of SU(2) representations, or the pseudobasis limited to the discrete
representations of SU(1,1); in alternative it is proposed to use instead a
basis of eigenstates of $(L_3,K_3)$, which might give matrix elements and
vertex functions with the same classical limit. A detailed example of a small
triangulation is presented, which among other things indicates, on the basis of
a classical calculation, that it would be impractical to limit oneself to
tetrahedra with time-like normals.


title:
An abstract Nash-Moser theorem and quasi-periodic solutions for NLW and
  NLS on compact Lie groups and homogeneous manifold

abstract:
  We prove an abstract Implicit Function Theorem with parameters for smooth
operators defined on sequence scales, modeled for the search of quasi-periodic
solutions of PDEs. The tame estimates required for the inverse linearised
operators at each step of the iterative scheme are deduced via a multiscale
inductive argument. The Cantor like set of parameters where the solution exists
is defined in a non inductive way. This formulation completely decouples the
iterative scheme from the measure theoretical analysis of the parameters where
the small divisors non-resonance conditions are verified. As an application, we
deduce the existence of quasi-periodic solutions for forced NLW and NLS
equations on any compact Lie group or manifold which is homogeneous with
respect to a compact Lie group, extending previous results valid only for tori.
A basic tool of harmonic analysis is the highest weight theory for the
irreducible representations of compact Lie groups.


title:
Majorana Neutrino Mass Matrices with a Texture Zero and a Cofactor Zero
  under Current Experimental Texts

abstract:
  The Majorana neutrino mass textures with a texture zero and a vanishing
cofactor are reconsidered in the light of current experimental results. A
numerical and systematic analysis is carried out for all viable patterns. In
particular, we focus on the phenomenological implication of correlations
between three mixing angle (especially for $\theta_{23}$), Dirac CP-violating
phase $\delta$, the effective Majorana neutrino mass $m_{ee}$. We demonstrated
that the correlations between these variables play an important role in the
model selection and can be measured in future long-baseline oscillation and
neutrinoless double beta decay. Among the six viable patterns, it is the
type-III with normal hierarchy and type-VI with inverted hierarchy that have
the parameter space where the atmospheric neutrino mixing angle $\theta_{23}$
is less then maximal and the Dirac CP-violating phase covers its best-fit
value.


title:
Doping evolution of the electron-hole asymmetric s-wave pseudogap in
  underdoped high-Tc cuprate superconductors

abstract:
  We study the doping evolution of the electronic structure in the pseudogap
state of high-Tc cuprate superconductors, by means of a cluster extension of
the dynamical mean-field theory applied to the two-dimensional Hubbard model.
The calculated single-particle excitation spectra in the strongly underdoped
regime show a marked electron-hole asymmetry and reveal a "s-wave" pseudogap,
which display a finite amplitude in all the directions in the momentum space
but not always at the Fermi level: The energy location of the gap strongly
depends on momentum, and in particular in the nodal region, it is above the
Fermi level. With increasing hole doping, the pseudogap disappears everywhere
in the momentum space. We show that the origin and the "s-wave" structure of
the pseudogap can be ascribed to the emergence of a strong-scattering surface,
which appears in the energy-momentum space close to the Mott insulator.


title: Pulsar Wind Nebulae Modeling

abstract:
  Pulsar Wind Nebulae (PWNe) are ideal astrophysical laboratories where high
energy relativistic phenomena can be investigated. They are close, well
resolved in our observations, and the knowledge derived in their study has a
strong impact in many other fields, from AGNs to GRBs. Yet there are still
unresolved issues, that prevent us from a full clear understanding of these
objects. The lucky combination of high resolution X-ray imaging and numerical
codes to handle the outflow and dynamical properties of relativistic MHD, has
opened a new avenue of investigation that has lead to interesting progresses in
the last years. Despite all of this, we do not understand yet how particles are
accelerated, and the functioning of the pulsar wind and pulsar magnetosphere,
that power PWNe. I will review what is now commonly known as the MHD paradigm,
and in particular I will focus on various approaches that have been and are
currently used to model these systems. For each I will highlight its
advantages, limitations, and degree of applicability.


title: The inverse Robin boundary value problem in a half-space

abstract:
  We study the inverse Robin problem for the Schr\"odinger equation in a
half-space. The potential is assumed to be compactly supported. We first solve
the direct problem for dimensions two and three. We then show that the
Robin-to-Robin map uniquely determines the potential q.


title:
Measuring the evaluation and impact of scientific works and their
  authors

abstract:
  Problems for evaluation and impact of published scientific works and their
authors are discussed. The role of citations in this process is pointed out.
Different bibliometric indicators are reviewed in this connection and ways for
generation of new bibliometric indices are given. The influence of different
circumstances, like self-citations, number of authors, time dependence and
publication types, on the evaluation and impact of scientific papers are
considered. The repercussion of works citations and their content is
investigated in this respect. Attention is paid also on implicit citations
which are not covered by the modern bibliometrics but often are reflected in
the peer reviews. Some aspects of the Web analogues of citations and new
possibilities of the Internet resources in evaluating authors achievements are
presented.


title:
Distributed Power Loss Minimization in Residential Micro Grids: a
  Communications Perspective

abstract:
  The constantly increasing number of power generation devices based on
renewables is calling for a transition from the centralized control of
electrical distribution grids to a distributed control scenario. In this
context, distributed generators (DGs) are exploited to achieve other objectives
beyond supporting loads, such as the minimization of the power losses along the
distribution lines. The aim of this work is that of designing a full-fledged
system that extends existing state of the art algorithms for the distributed
minimization of power losses. We take into account practical aspects such as
the design of a communication and coordination protocol that is resilient to
link failures and manages channel access, message delivery and DG coordination.
Thus, we analyze the performance of the resulting optimization and
communication scheme in terms of power loss reduction, reduction of aggregate
power demand, convergence rate and resilience to communication link failures.
After that, we discuss the results of a thorough simulation campaign, obtained
using topologies generated through a statistical approach that has been
validated in previous research, by also assessing the performance deviation
with respect to localized schemes, where the DGs are operated independently.
Our results reveal that the convergence and stability performance of the
selected algorithms vary greatly. However, configurations exist for which
convergence is possible within five to ten communication steps and, when just
30% of the nodes are DGs, the aggregate power demand is roughly halved. Also,
some of the considered approaches are quite robust against link failures as
they still provide gains with respect to the localized solutions for failure
rates as high as 50%.


title: Balanced condition in networks leads to Weibull statistics

abstract:
  The importance of the balance in inhibitory and excitatory couplings in the
brain has increasingly been realized. Despite the key role played by
inhibitory-excitatory couplings in the functioning of brain networks, the
impact of a balanced condition on the stability properties of underlying
networks remains largely unknown. We investigate properties of the largest
eigenvalues of networks having such couplings, and find that they follow
completely different statistics when in the balanced situation. Based on
numerical simulations, we demonstrate that the transition from Weibull to
Fr\'echet via the Gumbel distribution can be controlled by the variance of the
column sum of the adjacency matrix, which depends monotonically on the
denseness of the underlying network. As a balanced condition is imposed, the
largest real part of the eigenvalue emulates a transition to the generalized
extreme value statistics, independent of the inhibitory connection probability.
Furthermore, the transition to the Weibull statistics and the small-world
transition occur at the same rewiring probability, reflecting a more stable
system.

categories: q-bio.NC cond-mat.dis-nn nlin.AO physics.soc-ph


title:
Charge Dynamics Across the Disorder Driven Superconductor-Insulator
  Transition

abstract:
  While insensitive to weak non magnetic disorder, an s-wave superconductor can
be driven insulating by strong disorder. Using a scheme that captures the
correct ground state, and fully retains thermal amplitude and phase
fluctuations, we describe the disorder driven superconductor-insulator
transition at finite temperature. Our results on the resistivity suggest that
beyond moderate disorder the low temperature superconducting state can arise
out of an insulating normal state. We also find that the low frequency weight
in the density of states and optical conductivity are non monotonic in
disorder, with a maximum near critical disorder, and their high temperature
value correlate with the superconducting fraction in the disordered ground
state.


title: Radial symmetry of positive solutions involving the fractional Laplacian

abstract:
  The aim of this paper is to study radial symmetry and monotonicity properties
for positive solution of elliptic equations involving the fractional Laplacian.
We first consider the semi-linear Dirichlet problem (-\Delta)^{\alpha}
u=f(u)+g,\ \ {\rm{in}}\ \ B_1, \quad u=0\ \ {\rm in}\ \ B_1^c, where
$(-\Delta)^\alpha$ denotes the fractional Laplacian, $\alpha\in(0,1)$, and
$B_1$ denotes the open unit ball centered at the origin in $\R^N$ with $N\ge2$.
The function $f:[0,\infty)\to\R$ is assumed to be locally Lipschitz continuous
and $g: B_1\to\R$ is radially symmetric and decreasing in $|x|$.
  In the second place we consider radial symmetry of positive solutions for the
equation (-\Delta)^{\alpha} u=f(u),\ \ {\rm{in}}\ \ \R^N, with $u$ decaying at
infinity and $f$ satisfying some extra hypothesis, but possibly being
non-increasing.
  Our third goal is to consider radial symmetry of positive solutions for
system of the form
  (-\Delta)^{\alpha_1} u=f_1(v)+g_1,\ \ \ \ & {\rm{in}}\quad B_1,\\[2mm]
(-\Delta)^{\alpha_2} v=f_2(u)+g_2,\ \ \ \ & {\rm{in}} \quad B_1,\\[2mm]
  u=v =0,\ \ \ \ & {\rm{in}}\quad B_1^c, where $\alpha_1,\alpha_2\in(0,1)$, the
functions $f_1$ and $f_2$ are locally Lipschitz continuous and increasing in
$[0,\infty)$, and the functions $g_1$ and $g_2$ are radially symmetric and
decreasing.
  We prove our results through the method of moving planes, using the recently
proved ABP estimates for the fractional Laplacian. We use a truncation
technique to overcome the difficulty introduced by the non-local character of
the differential operator in the application of the moving planes.


title:
Twist-2 at five loops: Wrapping corrections without wrapping
  computations

abstract:
  Using known all-loop results from the BFKL and generalized double-logarithmic
equations and large spin limit we have recomputed the five-loop planar
anomalous dimension of twist-2 operators without consideration of any wrapping
effects. One part of the anomalous dimension was calculated in an usual way
with the help of Asymptotic Bethe Ansatz. The rest part, related with the
wrapping effects, was reconstructed from a known constraints with the help of
methods from the numbers theory.


title:
Rates of convergence in normal approximation under moment conditions via
  new bounds on solutions of the Stein equation

abstract:
  New bounds for the $k$-th order derivatives of the solutions of the normal
and multivariate normal Stein equations are obtained. Our general order bounds
involve fewer derivatives of the test function than those in the existing
literature. We apply these bounds and local approach couplings to obtain an
order $n^{-(p-1)/2}$ bound, for smooth test functions, for the distance between
the distribution of a standardised sum of independent and identically
distributed random variables and the standard normal distribution when the
first $p$ moments of these distributions agree. We also obtain a bound on the
convergence rate of a sequence of distributions to the normal distribution when
the moment sequence converges to normal moments.


title: Science enabled by high precision inertial formation flying

abstract:
  The capability of maintaining two satellites in precise relative position,
stable in a celestial coordinate system, would enable major advances in a
number of scientific disciplines and with a variety of types of
instrumentation. The common requirement is for formation flying of two
spacecraft with the direction of their vector separation in inertial
coordinates precisely controlled and accurately determined as a function of
time. We consider here the scientific goals that could be achieved with such
technology and review some of the proposals that have been made for specific
missions. Types of instrumentation that will benefit from the development of
this type of formation flying include 1) imaging systems, in which an optical
element on one spacecraft forms a distant image recorded by a detector array on
the other spacecraft, including telescopes capable of very high angular
resolution; 2) systems in which the front spacecraft of a pair carries an
occulting disk, allowing very high dynamic range observations of the solar
corona and exoplanets; 3) interferometers, another class of instrument that
aims at very high angular resolution and which, though usually requiring more
than two spacecraft, demands very much the same developments.