title: Quasi-Normal Modes for Subtracted Rotating and Magnetised Geometries

abstract:
  We obtain explicit separable solutions of the wave equation of massless
minimally coupled scalar fields in the subtracted geometry of four-dimensional
rotating and Melvin (magnetised) four-charge black holes of the STU model, a
consistent truncation of maximally supersymmetric supergravity with four types
of electromagnetic fields. These backgrounds possess a hidden SL(2,R) x SL(2,R)
x SO(3) symmetry and faithfully model the near horizon geometry of these black
holes, but locate them in a confining asymptotically conical box. For each
subtracted geometry we obtain two branches of quasi-normal modes, given in
terms of hypergeometric functions and spherical harmonics. One branch is
over-damped and the other under-damped and they exhibit rotational splitting.
No black hole bomb is possible because the Killing field which co-rotates with
the horizon is everywhere timelike outside the black hole. A five-dimensional
lift of these geometries is given locally by the product of a BTZ black hole
with a two-sphere. This allows an explicit analysis of the minimally coupled
massive five-dimensional scalar field. Again, there are two branches, both
damped, however now their oscillatory parts are shifted by the quantised wave
number $k$ along the fifth circle direction.


title:
AGN and quasar science with aperture masking interferometry on the James
  Webb Space Telescope

abstract:
  Due to feedback from accretion onto supermassive black holes (SMBHs), Active
Galactic Nuclei (AGNs) are believed to play a key role in LambdaCDM cosmology
and galaxy formation. However, AGNs' extreme luminosities and the small angular
size of their accretion flows create a challenging imaging problem. We show
James Webb Space Telescope's Near Infrared Imager and Slitless Spectrograph
(JWST-NIRISS) Aperture Masking Interferometry (AMI) mode will enable true
imaging (i.e. without any requirement of prior assumptions on source geometry)
at ~65 mas angular resolution at the centers of AGNs. This is advantageous for
studying complex extended accretion flows around SMBHs, and in other areas of
angular-resolution-limited astrophysics. By simulating data sequences
incorporating expected sources of noise, we demonstrate that JWST-NIRISS AMI
mode can map extended structure at a pixel-to-pixel contrast of ~10^{-2} around
an L=7.5 point source, using short exposure times (minutes). Such images will
test models of AGN feedback, fuelling and structure (complementary with ALMA
observations), and are not currently supported by any ground-based IR
interferometer or telescope. Binary point source contrast with NIRISS is
~10^{-4} (for observing binary nuclei in merging galaxies), significantly
better than current ground-based optical or IR interferometry. JWST-NIRISS'
seven-hole non-redundant mask has a throughput of 15%, and utilizes NIRISS'
F277W (2.77\micron), F380M (3.8\micron), F430M (4.3\micron), and F480M
(4.8\micron) filters. NIRISS' square pixels are 65mas per side, with a field of
view ~2\arcmin x 2\arcmin. We also extrapolate our results to AGN science
enabled by non-redundant masking on future 2.4m and 16m space telescopes
working at long-UV to near-IR wavelengths.


title:
Low-Complexity Particle Swarm Optimization for Time-Critical
  Applications

abstract:
  Particle swam optimization (PSO) is a popular stochastic optimization method
that has found wide applications in diverse fields. However, PSO suffers from
high computational complexity and slow convergence speed. High computational
complexity hinders its use in applications that have limited power resources
while slow convergence speed makes it unsuitable for time critical
applications. In this paper, we propose two techniques to overcome these
limitations. The first technique reduces the computational complexity of PSO
while the second technique speeds up its convergence. These techniques can be
applied, either separately or in conjunction, to any existing PSO variant. The
proposed techniques are robust to the number of dimensions of the optimization
problem. Simulation results are presented for the proposed techniques applied
to the standard PSO as well as to several PSO variants. The results show that
the use of both these techniques in conjunction results in a reduction in the
number of computations required as well as faster convergence speed while
maintaining an acceptable error performance for time-critical applications.


title: Challenges in Solar and Stellar Model Physics

abstract:
  We are reaching relative maturity and standardization in one-dimensional
single-star stellar evolution and pulsation modeling, and are making advances
in binary and 2D and 3D models. However, many physical inputs are still
uncertain or neglected in models of the Sun and of other stars. Thanks to the
the Kepler, CoRoT, and MOST spacecraft, for example, as well as to ground-based
networks, we now have pulsation data for stars that are of comparable quality
to that for the Sun to constrain models and test physical assumptions. Here I
will focus on main sequence (core H-burning) or slightly post-main sequence
(shell H-burning) stellar models, and some of the unsolved problems for these
stars. I will revisit the solar abundance problem, and show the effects of
modified electron screening, dark matter, and early mass loss on solar models.
I will discuss the gamma Dor/ delta Sct hybrid stars, the mismatch between
predicted and observed frequencies for delta Sct stars, and how seismology of
stars more massive than the Sun, e.g. the brightest Kepler target theta Cyg,
could help us constrain physical processes such as diffusive settling, test
pulsation driving mechanisms, and provide clues to the solar abundance problem.


title:
Fermi-LAT Detection of Gravitational Lens Delayed Gamma-ray Flares from
  Blazar B0218+357

abstract:
  Using data from the Fermi Large Area Telescope (LAT), we report the first
clear gamma-ray measurement of a delay between flares from the gravitationally
lensed images of a blazar. The delay was detected in B0218+357, a known
double-image lensed system, during a period of enhanced gamma-ray activity with
peak fluxes consistently observed to reach >20-50 times its previous average
flux. An auto-correlation function analysis identified a delay in the gamma-ray
data of 11.46 +/- 0.16 days (1 sigma) that is ~1 day greater than previous
radio measurements. Considering that it is beyond the capabilities of the LAT
to spatially resolve the two images, we nevertheless decomposed individual
sequences of superposing gamma-ray flares/delayed emissions. In three such
~8-10 day-long sequences within a ~4-month span, considering confusion due to
overlapping flaring emission and flux measurement uncertainties, we found flux
ratios consistent with ~1, thus systematically smaller than those from radio
observations. During the first, best-defined flare, the delayed emission was
detailed with a Fermi pointing, and we observed flux doubling timescales of
~3-6 hrs implying as well extremely compact gamma-ray emitting regions.


title:
Percolative superconductivity in La2CuO4.06 by lattice granularity
  patterns with scanning micro X-ray absorption near edge structure

abstract:
  The simplest cuprate superconductor La2CuO4+y with mobile oxygen
interstitials exhibits a clear phase separation, but only recently a bulk
multiscale structural phase separation has been observed by using scanning
micro X-ray diffraction. Here we get further information on the structural
phase separation, using local probe X-ray absorption near edge structure. The
spatial distribution of superconducting units is a key parameter controlling
percolative superconductivity in complex matter with dispersed superconducting
units. These oxides form super-molecular architectures made of superconducting
atomic monolayers intercalated by spacers. Oxygen interstitials enter into the
rocksalt La2O2+y spacer layers forming oxygen interstitials rich puddles and
poor puddles. Their spatial distribution has been determined by using scanning
La L3-edge micro X-ray absorption near edge structure. Percolating networks of
oxygen rich puddles are observed in different micrometer size portions of the
crystals. Moreover, the complex surface resistivity shows two jumps associated
to the onset of intra-puddle and inter-puddles percolative superconductivity.
The similarity of oxygen doped La2CuO4+y, with the well established phase
separation in iron selenide superconductors is also discussed.


title: Methodological principles of modern thermodynamics

abstract:
  The article describes basic principles of the theory which unites
thermodynamics of reversible and irreversible processes also extends them
methods on processes of transfer and transformation of any forms of energy


title: Giant Convection Cells Found on the Sun

abstract:
  Heat is transported through the outermost 30% of the Sun's interior by
overturning convective motions. These motions are evident at the Sun's surface
in the form of two characteristic cellular structures - granules and
supergranules (~1000 and ~30,000 km across respectively). The existence of much
larger cells has been suggested by both theory and observation for over 45
years. We found evidence for giant cellular flows that persist for months by
tracking the motions of supergranules. As expected from the effects of the
Sun's rotation, the flows in these cells are clockwise around high pressure in
the north, counter-clockwise in the south and transport angular momentum toward
the equator, maintaining the Sun's rapid equatorial rotation.


abstract:
  The purpose of this note is to study the number of elements in Minkowski
bases on algebraic surfaces with rational polyhedral pseudo-effective cone.


title: Update on 3D Moving Mesh Simulations of Galactic Center Cloud G2

abstract:
  Using three-dimensional, moving-mesh simulations, we investigate the future
evolution of the recently discovered gas cloud G2 traveling through the
galactic center. From our simulations we expect an average feeding rate onto
Sgr A* in the range of $(5-19) \times 10^{-8} M_\odot\mathrm{~yr}^{-1}$
beginning in 2014. This accretion varies by less than a factor of three on
timescales of about 1 month, and shows no more than a factor of 10 difference
between the maximum and minimum observed rates within any given model. These
rates are comparable to the current estimated accretion rate in the immediate
vicinity of Sgr A*, although they represent only a small (<10%) increase over
the current expected feeding rate at the effective inner boundary of our
simulations $(r_\mathrm{acc} = 750 R_S \sim 10^{15} \mathrm{cm})$. We also
explore multiple possible equations of state to describe the gas. In examining
the Br-$\gamma$ light curves produced from our simulations, we find that all of
our isothermal models predict significant (factor of 10) enhancements in the
luminosity of G2 as it approaches pericenter, in conflict with observations.
Models that instead allow the cloud to heat as it is compressed do better at
matching observations.


title:
The Witt Ring of a Curve with Good Reduction over a Non-dyadic Local
  Field

abstract:
  In this work, we present a generalization to varieties and sheaves of the
fundamental ideal of the Witt ring of a field by defining a sheaf of
fundamental ideals $\tilde{I}$ and a sheaf of Witt rings $\tilde{W}$ in the
obvious way. The Milnor conjecture then relates the associated graded of
$\tilde{W}$ to Milnor K-theory and so allows the classical invariants of a
bilinear space over a field to be extended to our setting using \'etale
cohomology. As an application of these results, we calculate the Witt ring of a
smooth curve with good reduction over a non-dyadic local field.


title: Relativistic spinor equation of photon

abstract:
  In this paper, we have proposed the spiron equation of free and non-free
photon, and give the spin operator and spin wave function of photon. We
calculate the helicity of photon and prove there are left-handed and
right-handed photon. By the spiron equation of non-free photon, we can study
the quantum property of photon in medium, which can be used in quantum optics,
photonic crystals and so on.


title: Stability of vector bundles on curves and degenerations

abstract:
  We observe that if we are interested primarily in degeneration arguments,
there is a weaker notion of (semi)stability for vector bundles on reducible
curves, which is sufficient for many applications, and does not depend on a
choice of polarization. We introduce and explore the basic properties of this
alternate notion of (semi)stability. In a complementary direction, we record a
proof of the existence of semistable extensions of vector bundles in suitable
degenerations.


title:
The statistical dynamics of a spatial logistic model and the related
  kinetic equation

abstract:
  There is studied an infinite system of point entities in $\mathbb{R}^d$ which
reproduce themselves and die, also due to competition. The system's states are
probability measures on the space of configurations of entities. Their
evolution is described by means of a BBGKY-type equation for the corresponding
correlation (moment) functions. It is proved that: (a) these functions evolve
on a bounded time interval and remain sub-Poissonian due to the competition;
(b) in the Vlasov scaling limit they converge to the correlation functions of
the time-dependent Poisson point field the density of which solves the kinetic
equation obtained in the scaling limit from the equation for the correlation
functions. A number of properties of the solutions of the kinetic equation are
also established.

categories: math-ph math.DS math.FA math.MP math.PR nlin.CD


title:
Emergence of the Kennicutt-Schmidt Relation from the Small-Scale
  SFR-Density Relation

abstract:
  We use simulations of isolated galaxies with a few parsec resolution to
explore the connection between the small-scale star formation rate - gas
density relation and the induced large-scale correlation between the star
formation rate surface density and the surface density of the molecular gas
(the Kennicutt-Schmidt relation). We find that, in the simulations, a power-law
small-scale "star formation law" directly translates into an identical
power-law Kennicutt-Schmidt relation. If this conclusion holds in the reality
as well, it implies that the observed approximately linear Kennicutt-Schmidt
relation must reflect the approximately linear small-scale "star formation
law".


title:
A fictitious domain approach for Fluid-Structure Interactions based on
  the eXtended Finite Element Method

abstract:
  In this work we develop a fictitious domain method for the Stokes problem
which allows computations in domains whose boundaries do not depend on the
mesh. The method is based on the ideas of Xfem and has been first introduced
for the Poisson problem. The fluid part is treated by a mixed finite element
method, and a Dirichlet condition is imposed by a Lagrange multiplier on an
immersed structure localized by a level-set function. A stabilization technique
is carried out in order to get the convergence for this multiplier. The latter
represents the forces that the fluid applies on the structure. The aim is to
perform fluid-structure simulations for which these forces have a central role.
We illustrate the capacities of the method by extending it to the
incompressible Navier-Stokes equations coupled with a moving rigid solid.


title: Universal scaling in fast quantum quenches in conformal field theories

abstract:
  We study the time evolution of a conformal field theory deformed by a
relevant operator under a smooth but fast quantum quench which brings it to the
conformal point. We argue that when the quench time scale $\delta t$ is small
compared to the scale set by the relevant coupling, the expectation value of
the quenched operator scales universally as $\delta g/ \delta t ^{2\Delta-d}$
where $\delta g$ is the quench amplitude. This growth is further enhanced by a
logarithmic factor in even dimensions. We present explicit results for free
scalar and fermionic field theories, supported by an analytic understanding of
the leading contribution for fast quenches. Results from this Letter suggest
that this scaling result, first found in holography, is in fact universal to
quantum quenches. Our considerations also show that this limit of fast smooth
quenches is quite different from an instantaneous quench from one
time-independent Hamiltonian to another, where the Schrodinger picture state at
the time of the quench simply serves as an initial condition for subsequent
evolution with the final Hamiltonian.


title:
User-Generated Free-Form Gestures for Authentication: Security and
  Memorability

abstract:
  This paper studies the security and memorability of free-form multitouch
gestures for mobile authentication. Towards this end, we collected a dataset
with a generate-test-retest paradigm where participants (N=63) generated
free-form gestures, repeated them, and were later retested for memory. Half of
the participants decided to generate one-finger gestures, and the other half
generated multi-finger gestures. Although there has been recent work on
template-based gestures, there are yet no metrics to analyze security of either
template or free-form gestures. For example, entropy-based metrics used for
text-based passwords are not suitable for capturing the security and
memorability of free-form gestures. Hence, we modify a recently proposed metric
for analyzing information capacity of continuous full-body movements for this
purpose. Our metric computed estimated mutual information in repeated sets of
gestures. Surprisingly, one-finger gestures had higher average mutual
information. Gestures with many hard angles and turns had the highest mutual
information. The best-remembered gestures included signatures and simple
angular shapes. We also implemented a multitouch recognizer to evaluate the
practicality of free-form gestures in a real authentication system and how they
perform against shoulder surfing attacks. We conclude the paper with strategies
for generating secure and memorable free-form gestures, which present a robust
method for mobile authentication.


title: Optimal Investment with Transaction Costs and Stochastic Volatility

abstract:
  Two major financial market complexities are transaction costs and uncertain
volatility, and we analyze their joint impact on the problem of portfolio
optimization. When volatility is constant, the transaction costs optimal
investment problem has a long history, especially in the use of asymptotic
approximations when the cost is small. Under stochastic volatility, but with no
transaction costs, the Merton problem under general utility functions can also
be analyzed with asymptotic methods. Here, we look at the long-run growth rate
problem when both complexities are present, using separation of time scales
approximations. This leads to perturbation analysis of an eigenvalue problem.
We find the first term in the asymptotic expansion in the time scale parameter,
of the optimal long-term growth rate, and of the optimal strategy, for fixed
small transaction costs.


title:
The molecular gas reservoir of 6 low-metallicity galaxies from the
  Herschel Dwarf Galaxy Survey: A ground-based follow-up survey of CO(1-0),
  CO(2-1), and CO(3-2)

abstract:
  We aim to quantify the molecular gas reservoir in a subset of 6
low-metallicity galaxies from the Herschel Dwarf Galaxy Survey with newly
acquired CO data, and link this reservoir to the observed star formation
activity. We present CO(1-0), CO(2-1), and CO(3-2) observations obtained at the
ATNF Mopra 22-m, APEX, and IRAM 30-m telescopes, as well as [CII] 157um and
[OI] 63um observations obtained with the Herschel/PACS spectrometer in the 6
galaxies: Haro11, Mrk1089, Mrk930, NGC4861, NGC625, and UM311. We derive
molecular gas mass from several methods including the use of the CO-to-H2
conversion factor Xco (both Galactic and metallicity-scaled values) and of dust
measurements. The molecular and atomic gas reservoirs are compared to the star
formation activity. We also constrain the physical conditions of the molecular
clouds using the non-LTE code RADEX and the spectral synthesis code Cloudy. We
detect CO in 5 of the 6 galaxies, including first detections in Haro11 (Z~0.4
Zsun), Mrk930 (0.2 Zsun), and UM311 (0.5 Zsun), but CO remains undetected in
NGC4861 (0.2 Zsun). The CO luminosities are low while [CII] is bright in these
galaxies, resulting in [CII]/CO(1-0)>10000. Our dwarf galaxies are in
relatively good agreement with the Schmidt-Kennicutt relation for total gas.
They show short molecular depletion time scales, even when considering
metallicity-scaled Xco factors. Those galaxies are dominated by their HI gas,
except Haro11 which has high star formation efficiency and is dominated by
ionized and molecular gas. We determine the mass of each ISM phase in Haro11
using Cloudy and estimate an equivalent Xco factor which is 10 times higher
than the Galactic value. Overall, our results confirm the emerging picture that
CO suffers from significant selective photodissociation in low-metallicity
dwarf galaxies.


title: Proceedings First Latin American Workshop on Formal Methods

abstract:
  Formal approaches to software development are techniques that aim at
developing quality software by employing notations, analysis processes, etc.,
based on mathematical grounds. Although traditionally they aim at increasing
software correctness, formal techniques have been applied to various other
aspects of software quality. Moreover, while originally formal methods employed
complex "heavyweight" mechanisms for analysis (often manual or semi automated),
there has been progress towards embracing "lightweight", many times fully
automated, analysis techniques, that broaden the adoption of formal methods in
various software engineering contexts.
  The Latin American Workshop on Formal Methods brings together researchers
working in formal methods, and related areas such as automated analysis. In
particular, the workshop provides a venue for Latin American researchers
working in these areas, to promote their interaction and collaboration.
  The workshop was held in August as a satellite event of CONCUR 2013. It took
place in Buenos Aires, Argentina's capital and largest city, and one of the
most interesting cultural places in South America.


title:
Alfv\'en Wave Turbulence as a Coronal Heating Mechanism: Simultaneously
  Predicting the Heating Rate and the Wave-Induced Emission Line Broadening

abstract:
  In the present work, we test the predictions of the AWSoM model, a global
extended-MHD model capable of calculating the propagation and turbulent
dissipation of Alfv\'en waves in any magnetic topology, against high resolution
spectra of the quiescent off-disk solar corona. Wave dissipation is the only
heating mechanism assumed in this model. Combining 3D model results with the
CHIANTI atomic database, we were able to create synthetic line-of-sight spectra
which include the effects of emission line broadening due to both thermal and
wave-related non-thermal motions. To the best of our knowledge this is the
first time a global model is used to obtain synthetic non-thermal line
broadening. We obtained a steady-state solution driven by a synoptic
magnetogram and compared the synthetic spectra with SUMER observations of a
quiescent area above the solar west limb extending between 1.04 and 1.34 solar
radii at the equator. Both the predicted line widths and the total line fluxes
were consistent with the observations for 5 different ions. Using the 3D
solution, we were able to locate the region that contributes the most to the
emission used for measuring electron properties; we found that region to be a
pseudo-streamer, whose modeled electron temperature and density are consistent
with the measured ones. We conclude that the turbulent dissipation assumed in
the AWSoM model can simultaneously account for the observed heating rate and
the non-dissipated wave energy observed in this region.


title: Detecting the work statistics through Ramsey-like interferometry

abstract:
  Out-of-equilibrium statistical mechanics is attracting considerable interest
due to the recent advances in the control and manipulations of systems at the
quantum level. Recently, an interferometric scheme for the detection of the
characteristic function of the work distribution following a time-dependent
process has been proposed [L. Mazzola {\it et al}, Phys. Rev. Lett. {\bf 110}
230602 (2013)]. There, it was demonstrated that the work statistics of a
quantum system undergoing a process can be reconstructed by effectively mapping
the characteristic function of work on the state of an ancillary qubit. Here,
we expand that work in two important directions. We first apply the protocol to
an interesting specific physical example consisting of a superconducting qubit
dispersively coupled to the field of a microwave resonator, thus enlarging the
class of situations for which our scheme would be key in the task highlighted
above. We then account for the interaction of the system with an additional one
(which might embody an environment), and generalise the protocol accordingly.


title: Group-theoretic models of the inversion process in bacterial genomes

abstract:
  The variation in genome arrangements among bacterial taxa is largely due to
the process of inversion. Recent studies indicate that not all inversions are
equally probable, suggesting, for instance, that shorter inversions are more
frequent than longer, and those that move the terminus of replication are less
probable than those that do not. Current methods for establishing the inversion
distance between two bacterial genomes are unable to incorporate such
information. In this paper we suggest a group-theoretic framework that in
principle can take these constraints into account. In particular, we show that
by lifting the problem from circular permutations to the affine symmetric
group, the inversion distance can be found in polynomial time for a model in
which inversions are restricted to acting on two regions. This requires the
proof of new results in group theory, and suggests a vein of new combinatorial
problems concerning permutation groups on which group theorists will be needed
to collaborate with biologists. We apply the new method to inferring distances
and phylogenies for published Yersinia pestis data.


title:
Bounding the greybody factors for scalar excitations of the Kerr-Newman
  spacetime

abstract:
  Finding exact solutions for black-hole greybody factors is generically
impractical; typically one resorts either to making semi-analytic or numerical
estimates, or alternatively to deriving rigorous analytic bounds. Indeed,
rigorous bounds have already been established for the greybody factors of
Schwarzschild and Riessner-Nordstrom black holes, and more generally for those
of arbitrary static spherically symmetric asymptotically flat black holes.
Adding rotation to the problem greatly increases the level of difficulty, both
for purely technical reasons (the Kerr or Kerr-Newman black holes are generally
much more difficult to work with than the Schwarzschild or Reissner-Nordstrom
black holes), but also at a conceptual level (due to the generic presence of
super-radiant modes). In the current article we analyze bounds on the greybody
factors for scalar excitations of the Kerr-Newman geometry in some detail,
first for zero-angular-momentum modes, then for the non-super-radiant modes,
and finally for the super-radiant modes.


title:
Natural Language Processing in Biomedicine: A Unified System
  Architecture Overview

abstract:
  In modern electronic medical records (EMR) much of the clinically important
data - signs and symptoms, symptom severity, disease status, etc. - are not
provided in structured data fields, but rather are encoded in clinician
generated narrative text. Natural language processing (NLP) provides a means of
"unlocking" this important data source for applications in clinical decision
support, quality assurance, and public health. This chapter provides an
overview of representative NLP systems in biomedicine based on a unified
architectural view. A general architecture in an NLP system consists of two
main components: background knowledge that includes biomedical knowledge
resources and a framework that integrates NLP tools to process text. Systems
differ in both components, which we will review briefly. Additionally,
challenges facing current research efforts in biomedical NLP include the
paucity of large, publicly available annotated corpora, although initiatives
that facilitate data sharing, system evaluation, and collaborative work between
researchers in clinical NLP are starting to emerge.


title: Groups of PL homeomorphisms of cubes

abstract:
  We study algebraic properties of groups of PL or smooth homeomorphisms of
unit cubes in any dimension, fixed pointwise on the boundary, and more
generally PL or smooth groups acting on manifolds and fixing pointwise a
submanifold of codimension 1 (resp. codimension 2), and show that such groups
are locally indicable (resp. circularly orderable). We also give many examples
of interesting groups that can act, and discuss some other algebraic
constraints that such groups must satisfy, including the fact that a group of
PL homeomorphisms of the n-cube (fixed pointwise on the boundary) contains no
elements that are more than exponentially distorted.


title:
The semileptonic decays of $B/B_s$ meson in the perturbative QCD
  approach: A short review

abstract:
  In this short review, we present the current status about the theoretical and
experimental studies for some important semileptonic decays of $B/B_s$ mesons.
We firstly gave a brief introduction for the experimental measurements for
$B/B_s \to P (l^+l^-, l^-\bar{\nu}_l, \nu \bar{\nu})$ decays, the BaBar's
$R(D)$ and $R(D^*)$ anomaly, the $P_5^\prime$ deviation for $B^0 \to K^{*0}
\mu^+ \mu^-$ decay. We then made a careful discussion about the evaluations for
the relevant form factors in the light-cone QCD sum rule (LCSRs), the heavy
quark effective theory, and the perturbative QCD factorization approach. By
using the form factors calculated in the perturbative (pQCD) approach, we then
calculate and show the pQCD predictions for the decay rates of many
semileptonic decays of $B/B_s$ mesons. We also made careful phenomenological
analysis for these pQCD predictions and found, in general, the following
points: (a) For all the considered $B/B_s$ semileptonic decays, the
next-to-leading order (NLO) pQCD predictions for their decay rates agree well
with the data and those from other different theoretical methods; (b) For
$R(D)$ and $R(D^*)$, the pQCD predictions agree very well with the data, the
BaBar's anomaly of $R(D^{(*)})$ are therefore explained successfully in the
standard model by employing the pQCD approach; and (c) We defined several new
ratios $R_D^{l,\tau}$ and $R_{D_s}^{l,\tau}$, they may be more sensitive to the
QCD dynamics which controls the $B/B_s \to (D^{(*)},D_s^{(*)})$ transitions
than the old ratios, we therefore strongly suggest LHCb and the forthcoming
Super-B experiments to measure these new ratios.


title:
Revealing the role of electron correlation in sequential double
  ionization

abstract:
  The experimental observations of sequential double ionization (SDI) of Ar [A.
N. Pfeiffer {\it et al.}, Nature Phys. {\bf 7}, 428 (2011)], such as the
four-peak momentum distribution and the ionization time of the first and second
electrons, are investigated and reproduced with a quantum model by including
and excluding the $e$-$e$ correlation effect. Based on the comparison of
experiment and simulation, the role of $e$-$e$ correlation in SDI is discussed.
It is shown that the inclusion of $e$-$e$ correlation is necessary to reproduce
the momentum distribution of electrons.


title:
Hubble Space Telescope detection of the double pulsar system J0737-3039
  in the far-ultraviolet

abstract:
  We report on detection of the double pulsar system J0737-3039 in the far-UV
with the ACS/SBC detector aboard HST. We measured the energy flux F =
4.5+/-1.0e-17 erg cm-2s-1 in the 1250-1550 AA band, which corresponds to the
extinction-corrected luminosity L~1.5e28 erg s-1 for the distance d=1.1 kpc and
a plausible reddening E(B-V)=0.1. If the detected emission comes from the
entire surface of one of the neutron stars with a 13 km radius, the surface
blackbody temperature is in the range T~2-5e5 K for a reasonable range of
interstellar extinction. Such a temperature requires an internal heating
mechanism to operate in old neutron stars, or it might be explained by heating
of the surface of the less energetic Pulsar B by the relativistic wind of
Pulsar A. If the far-UV emission is non-thermal (e.g., produced in the
magnetosphere of Pulsar A), its spectrum exhibits a break between the UV and
X-rays.


title:
Carbon-Enhanced Metal-Poor Stars: CEMP-s and CEMP-no Sub-Classes in the
  Halo System of the Milky Way

abstract:
  We explore the kinematics and orbital properties of a sample of 323 very
metal-poor stars in the halo system of the Milky Way, selected from the
high-resolution spectroscopic follow-up studies of Aoki et al. and Yong et al.
The combined sample contains a significant fraction of carbon-enhanced
metal-poor (CEMP) stars (22% or 29%, depending on whether a strict or relaxed
criterion is applied for this definition). Barium abundances (or upper limits)
are available for the great majority of the CEMP stars, allowing for their
separation into the CEMP-$s$ and CEMP-no sub-classes. A new method to assign
membership to the inner- and outer-halo populations of the Milky Way is
developed, making use of the integrals of motion, and applied to determine the
relative fractions of CEMP stars in these two sub-classes for each halo
component. Although limited by small-number statistics, the data suggest that
the inner halo of the Milky Way exhibits a somewhat higher relative number of
CEMP-$s$ stars than CEMP-no stars (57% vs. 43%), while the outer halo possesses
a clearly higher fraction of CEMP-no stars than CEMP-$s$ stars (70% vs. 30%).
Although larger samples of CEMP stars with known Ba abundances are required,
this result suggests that the dominant progenitors of CEMP stars in the two
halo components were different; massive stars for the outer halo, and
intermediate-mass stars in the case of the inner halo.


title: Spin-Orbit Coupled Bose Gases at Finite Temperatures

abstract:
  Spin-orbit coupling is predicted to have dramatic effects on thermal
properties of a two-component atomic Bose gas. We show that in three spatial
dimensions it lowers the critical temperature of condensation and enhances
thermal depletion of the condensate fraction. In two dimensions we show that
spin-orbit coupling destroys superfluidity at any finite temperature, modifying
dramatically the cerebrated Berezinskii-Kosterlitz-Thouless scenario. We
explain this by the increase of the number of low energy states induced by
spin-orbit coupling, enhancing the role of quantum fluctuations.


title: MoS2 Nanoresonators: Intrinsically Better Than Graphene?

abstract:
  We perform classical molecular dynamics simulations to examine the intrinsic
energy dissipation in single-layer MoS$_{2}$ nanoresonators, where a point of
emphasis is to compare its dissipation characteristics with those of
single-layer graphene. Our key finding is that MoS$_{2}$ nanoresonators exhibit
significantly lower energy dissipation, and thus higher quality (Q)-factors by
at least a factor of four below room temperature, than graphene. Furthermore,
this high Q-factor endows MoS$_{2}$ nanoresonators with a higher figure of
merit, defined as frequency times Q-factor, despite a resonant frequency that
is $50%$ smaller than graphene for the same size. By utilizing arguments from
phonon-phonon scattering theory, we show that this reduced energy dissipation
is enabled by the large energy gap in the phonon dispersion of MoS$_{2}$, which
separates the acoustic phonon branches from the optical phonon branches,
leading to a preserving mechanism for the resonant oscillation of MoS$_{2}$
nanoresonators. We further investigate the effects of tensile mechanical strain
and nonlinear actuation on the Q-factors, where the tensile strain is found to
counteract the reductions in Q-factor that occur with higher actuation
amplitudes. Overall, our simulations illustrate the potential utility of
MoS$_{2}$ for high frequency sensing and actuation applications.


title:
Phonon Modes in Single-Walled Molybdenum Disulphide (MoS2) Nanotubes:
  Lattice Dynamics Calculation and Molecular Dynamics Simulation

abstract:
  We study the phonon modes in single-walled MoS$_{2}$ nanotubes via the
lattice dynamics calculation and molecular dynamics simulation. The phonon
spectra for tubes of arbitrary chiralities are calculated from the dynamical
matrix constructed by the combination of an empirical potential with the
conserved helical quantum numbers $(\kappa, n)$. In particular, we show that
the frequency ($\omega$) of the radial breathing mode is inversely proportional
to the tube diameter ($d$) as $\omega=665.3/d$ {cm$^{-1}$}. The eigen vectors
of the first twenty lowest-frequency phonon modes are illustrated. Based on
these eigen vectors, we demonstrate that the radial breathing oscillation is
disturbed by phonon modes of three-fold symmetry initially, and the tube is
squashed by the modes of two-fold symmetry eventually. Our study provides
fundamental knowledge for further investigations of the thermal and mechanical
properties of the MoS$_{2}$ nanotubes.


title:
An Improved RIP-Based Performance Guarantee for Sparse Signal Recovery
  via Orthogonal Matching Pursuit

abstract:
  A sufficient condition reported very recently for perfect recovery of a
K-sparse vector via orthogonal matching pursuit (OMP) in K iterations is that
the restricted isometry constant of the sensing matrix satisfies
delta_K+1<1/(sqrt(delta_K+1)+1). By exploiting an approximate orthogonality
condition characterized via the achievable angles between two orthogonal sparse
vectors upon compression, this paper shows that the upper bound on delta can be
further relaxed to delta_K+1<(sqrt(1+4*delta_K+1)-1)/(2K).This result thus
narrows the gap between the so far best known bound and the ultimate
performance guarantee delta_K+1<1/(sqrt(delta_K+1)) that is conjectured by Dai
and Milenkovic in 2009. The proposed approximate orthogonality condition is
also exploited to derive less restricted sufficient conditions for signal
reconstruction in several compressive sensing problems, including signal
recovery via OMP in a noisy environment, compressive domain interference
cancellation, and support identification via the subspace pursuit algorithm.


title: More Algorithms for Provable Dictionary Learning

abstract:
  In dictionary learning, also known as sparse coding, the algorithm is given
samples of the form $y = Ax$ where $x\in \mathbb{R}^m$ is an unknown random
sparse vector and $A$ is an unknown dictionary matrix in $\mathbb{R}^{n\times
m}$ (usually $m > n$, which is the overcomplete case). The goal is to learn $A$
and $x$. This problem has been studied in neuroscience, machine learning,
visions, and image processing. In practice it is solved by heuristic algorithms
and provable algorithms seemed hard to find. Recently, provable algorithms were
found that work if the unknown feature vector $x$ is $\sqrt{n}$-sparse or even
sparser. Spielman et al. \cite{DBLP:journals/jmlr/SpielmanWW12} did this for
dictionaries where $m=n$; Arora et al. \cite{AGM} gave an algorithm for
overcomplete ($m >n$) and incoherent matrices $A$; and Agarwal et al.
\cite{DBLP:journals/corr/AgarwalAN13} handled a similar case but with weaker
guarantees.
  This raised the problem of designing provable algorithms that allow sparsity
$\gg \sqrt{n}$ in the hidden vector $x$. The current paper designs algorithms
that allow sparsity up to $n/poly(\log n)$. It works for a class of matrices
where features are individually recoverable, a new notion identified in this
paper that may motivate further work.
  The algorithm runs in quasipolynomial time because they use limited
enumeration.


title: Descent via (3,3)-isogeny on Jacobians of genus 2 curves

abstract:
  We give parametrisation of curves C of genus 2 with a maximal isotropic
(ZZ/3)^2 in J[3], where J is the Jacobian variety of C, and develop the theory
required to perform descent via (3,3)-isogeny. We apply this to several
examples, where it can shown that non-reducible Jacobians have nontrivial
3-part of the Tate-Shafarevich group.


title:
Solar wind dominance over the Poynting-Robertson effect in secular
  orbital evolution of dust particles

abstract:
  Properties of the solar wind are discussed and applied to the effect of the
wind on motion of bodies in the Solar System. The velocity density function for
the solar wind constituents is given by the $\kappa-$distribution. The relevant
contributions to the solar wind action contain also the sputtering and
reflection components in addition to direct impact. The solar wind effect is
more important than the action of the solar electromagnetic radiation, as for
the secular orbital evolution. The effect of the solar corpuscular radiation is
more important than the Poynting-Robertson effect even when mass of the dust
particle is considered to be constant, non-radial component of the solar wind
velocity is neglected and the time dependence of the solar wind properties is
ignored.
  The presented equation of motion of a body under the action of the solar
radiation, electromagnetic and corpuscular, respects reality in a much better
way than the conventionally used equation. The acceleration of the body is
proportional to the superposition of the radial velocity component multiplied
by the numerical coefficient $[2 + (\eta_{1} + \eta_{2})/ \overline{Q}
~'_{pr}]$ and the transversal velocity component multiplied by the numerical
coefficient $(1 + \eta_{2}/ \overline{Q} ~'_{pr})$, where $\overline{Q}
~'_{pr}$ is the dimensionless efficiency factor of the radiation pressure. Here
$\eta_{1}$ $\doteq$ 1.1, $\eta_{2}$ $\doteq$ 1.4 and the velocity is the body's
velocity with respect to the Sun. Also time variability of $\eta_{1}$ and
$\eta_{2}$ due to the solar cycle is given.
  The dimensionless cross section the dust grain presents to wind pressure is
about 4.7. This value differs from the conventionally used value 1.0. The
mass-loss rate of the zodiacal cloud is 4-times higher than the currently
accepted value, as for the micron-sized dust particles.


title:
Mo and N Co-Doped Titanium Dioxide Nanotube Arrays with Enhanced Visible
  Light Photocatalytic Activity

abstract:
  Molybdenum and nitrogen co-doped $TiO_2$ nanotube arrays (TNAs) were prepared
by anodizing in association with hydrothermal treatment. As-prepared Mo and N
co-doped TNAs were characterized by field emission scanning electron
microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and
ultraviolet-visible light diffuse reflection spectroscopy. Besides, the
photocatalytic activity of Mo and N co-doped TNAs for the degradation of
methylene blue (denoted as MB) under visible light irradiation was evaluated.
It was found that N in co-doped TNAs coexists in the forms of N-Ti-O and
N-O-Ti, while Mo exists as $Mo^{6+}$ by substituting Ti in the lattice of
$TiO_2$. In the meantime, Mo and N co-doping extends the absorption of TNAs
into the whole visible light region and results in remarkably enhanced
photocatalytic activity for the degradation of MB under visible light
irradiation. This could be attributed to the synergetic effect between
Mo-doping and N-doping. Namely, Mo and N passivated co-doping produces new
states in TNAs, thereby narrowing the bandgap and decreasing the recombination
rate of electrons and holes. As a result, the visible light absorption and
photocatalytic activity of TNAs is greatly increased. Furthermore, Mo ions with
multiple valences in all co-doped samples could act as trapping sites to
effectively decrease the recombination rate of electrons and holes, which also
contribute to improved photocatalytic activity of Mo and N co-doped TNAs.
Keywords: TiO2 Nanotube Arrays, Mo, N, Co-Doping, Photocatalytic Activity.


title: Adaptive-Rate Compressive Sensing Using Side Information

abstract:
  We provide two novel adaptive-rate compressive sensing (CS) strategies for
sparse, time-varying signals using side information. Our first method utilizes
extra cross-validation measurements, and the second one exploits extra
low-resolution measurements. Unlike the majority of current CS techniques, we
do not assume that we know an upper bound on the number of significant
coefficients that comprise the images in the video sequence. Instead, we use
the side information to predict the number of significant coefficients in the
signal at the next time instant. For each image in the video sequence, our
techniques specify a fixed number of spatially-multiplexed CS measurements to
acquire, and adjust this quantity from image to image. Our strategies are
developed in the specific context of background subtraction for surveillance
video, and we experimentally validate the proposed methods on real video
sequences.


title:
On the deformations and derivations of $n$-ary multiplicative
  Hom-Nambu-Lie superalgebras

abstract:
  In this paper, we introduce the relevant concepts of $n$-ary multiplicative
Hom-Nambu-Lie superalgebras and construct three classes of $n$-ary
multiplicative Hom-Nambu-Lie superalgebras. As a generalization of the notion
of derivations for $n$-ary multiplicative Hom-Nambu-Lie algebras, we discuss
the derivations of $n$-ary multiplicative Hom-Nambu-Lie superalgebras. In
addition, the theory of one parameter formal deformation of $n$-ary
multiplicative Hom-Nambu-Lie superalgebras is developed by choosing a suitable
cohomology.


title: CloudFridge: A Testbed for Smart Fridge Interactions

abstract:
  We present a testbed for exploring novel smart refrigerator interactions, and
identify three key adoption-limiting interaction shortcomings of
state-of-the-art smart fridges: lack of 1) user experience focus, 2)
low-intrusion object recognition and 2) automatic item position detection. Our
testbed system addresses these limitations by a combination of sensors,
software filters, architectural components and a RESTful API to track
interaction events in real-time, and retrieve current state and historical data
to learn patterns and recommend user actions. We evaluate the accuracy and
overhead of our system in a realistic interaction flow. The accuracy was
measured to 83-88% and the overhead compared to a representative
state-of-the-art barcode scanner improved by 27%. We also showcase two
applications built on top of our testbed, one for finding expired items and
ingredients of dishes; and one to monitor your health. The pattern that these
applications have in common is that they cast the interaction as an
item-recommendation problem triggered when the user takes something out. Our
testbed could help reveal further user-experience centric interaction patterns
and new classes of applications for smart fridges that inherently, by relying
on our testbed primitives, mitigate the issues with existing approaches.


title: Hot Accretion Flows Around Black Holes

abstract:
  Black hole accretion flows can be divided into two broad classes: cold and
hot. Cold accretion flows, which consist of cool optically thick gas, are found
at relatively high mass accretion rates. Prominent examples are the standard
thin disk, which occurs at a fraction of the Eddington mass accretion rate, and
the slim disk at super-Eddington rates. These accretion flows are responsible
for luminous systems such as active galactic nuclei radiating at or close to
the Eddington luminosity and black hole X-ray binaries in the soft state. Hot
accretion flows, the topic of this review, are virially hot and optically thin.
They occur at lower mass accretion rates, and are described by models such as
the advection-dominated accretion flow and luminous hot accretion flow. Because
of energy advection, the radiative efficiency of these flows is in general
lower than that of a standard thin accretion disk. Moreover, the efficiency
decreases with decreasing mass accretion rate. Observations show that hot
accretion flows are associated with jets. In addition, theoretical arguments
suggest that hot flows should produce strong winds. Hot accretion flows are
believed to be present in low-luminosity active galactic nuclei and in black
hole X-ray binaries in the hard and quiescent states. The prototype is Sgr A*,
the ultra-low-luminosity supermassive black hole at our Galactic center. The
jet, wind and radiation from a supermassive black hole with a hot accretion
flow can interact with the external interstellar medium and modify the
evolution of the host galaxy. Details of this "maintenance-mode feedback"
could, in principle, be worked out through theoretical studies and numerical
simulations of hot accretion flows.


title:
Nanosystem Self-Assembly Pathways Discovered via All-Atom Multiscale
  Analysis

abstract:
  We consider the self-assembly of composite structures from a group of
nanocomponents, each consisting of particles within an $N$-atom system.
Self-assembly pathways and rates for nanocomposites are derived via a
multiscale analysis of the classical Liouville equation. From a reduced
statistical framework, rigorous stochastic equations for population levels of
beginning, intermediate, and final aggregates are also derived. It is shown
that the definition of an assembly type is a self-consistency criterion that
must strike a balance between precision and the need for population levels to
be slowly varying relative to the time scale of atomic motion. The deductive
multiscale approach is complemented by a qualitative notion of multicomponent
association and the ensemble of exact atomic-level configurations consistent
with them. In processes such as viral self-assembly from proteins and RNA or
DNA, there are many possible intermediates, so that it is usually difficult to
predict the most efficient assembly pathway. However, in the current study,
rates of assembly of each possible intermediate can be predicted. This avoids
the need, as in a phenomenological approach, for recalibration with each new
application. The method accounts for the feedback across scales in space and
time that is fundamental to nanosystem self-assembly. The theory has
applications to bionanostructures, geomaterials, engineered composites, and
nanocapsule therapeutic delivery systems.


title: Musings on Firewalls and the Information Paradox

abstract:
  The past year has seen an explosion of new and old ideas about black hole
physics. Prior to the firewall paper, the dominant picture was the thermofield
model apparently implied by ADS/CFT duality\cite{mal2}. While some seek a
narrow responce to Almheiri, Marolf, Polchinski, and Sully,(AMPS)\cite{amps},
there are a number of competing models. One problem in the field is the
ambiguity of the competing proposals. Some are equivalent while others
incompatible. This paper will attempt to define and classify a few models
representative of the current discussions.


title:
Stochastic First Integrals, Kernel Functions for Integral Invariants and
  the Kolmogorov equations

abstract:
  In this article the authors present stochastic first integrals (SFI), the
generalized It\^o-Wentzell formula and its application for obtaining the
equations for SFI, for kernel functions for integral invariants and the
Kolmogorov equations, described by the generalized It\^o equations.


title: Note on explicit form of entanglement entropy in the RST model

abstract:
  For an evaporating black hole which is a radiation-black hole combined
system, we express the entanglement entropy and the Page time in terms of the
conformal time in the RST model. The entropy change of the black hole is nicely
written in terms of Hawking flux. Integrating the first law of thermodynamics,
we can obtain the decreasing black-hole entropy and the increasing radiation
entropy, and the entanglement entropy for this system based on the Page
argument. We also obtain analytically the critical temperature to release
black-hole information, which corresponds to the Page time, and discuss the
relation between the conserved total entropy and information recovering of the
black hole in this model.


title: ICT in Local Self Governance: A Study of Rural India

abstract:
  The concept of local self-governance is not new as it has its roots in
ancient time even before the era of Mauryan emperors. This paper depicts the
journey of local self-governance from antediluvian time to 21st century.
Further, in the current scenario Information and Communication Technology (ICT)
has emerged as a successful tool for dissemination of various e-governance
services and in this regard the Government of India has formulated NeGP with
adequate service delivery mechanism. With the inculcation of ICT, various
applications were designed by central as well as state governments which lead
towards strengthening of PRIs for rural reform. This paper also throws some
light on necessity of ICT in self-governance along with some case studies.


title:
The influence of van der Waals forces on the waveguide deformation and
  power limit of nanoscale optomechanical systems

abstract:
  The ultra-short range force, van der Waals force (VWF), will rise rapidly
when one nanoscale waveguide is close to another one, and be stronger than the
external transverse gradient force (TGF). We theoretically investigate the
giant influence of the VWF on the device performance in a typical
optomechanical system consisting of a suspended silicon waveguide and a silica
substrate including waveguide deformation stiction and failure mechanism. The
device shows unique optically-activated plastic/elastic behaviors and stiction
due to the VWF. When the input optical power is above the critical power, the
waveguide is sticking to the substrate and the deformation is plastic and
unrecoverable, even though the total force is less than the yield strength of
the waveguide material. This is important and helpful for the design and
applications of optomechanical devices.


title: Spin Liquid Condensate of Spinful Bosons

abstract:
  We introduce the concept of a bosonic spin liquid condensate (SLC), where
spinful bosons in a lattice form a zero-temperature spin disordered charge
condensate that preserves the spin rotation symmetry, but breaks the U(1)
symmetry due to a spinless order parameter with charge one. It has an energy
gap to all the spin excitations. We show that such SLC states can be realized
in a system of spin $S\ge 2$ bosons. In particular, we analyze the SLC phase
diagram in the spin 2 case using a mean-field variational wave function method.
We show there is a direct analogy between the SLC and the
resonating-valence-bond (RVB) state.


title:
L^{4,\infty}-solution to the Navier-Stokes Equations in four-dimensional
  space

abstract:
  In this paper, we have showed $L^{4,\infty}$-solutions to the cauchy problem
for the four-dimensional Navier-Stokes equations are smooth through backward
uniqueness and analytic functions properties .


title: Confronting the concordance model of cosmology with Planck data

abstract:
  We confront the concordance (standard) model of cosmology, the spatially flat
$\Lambda$CDM Universe with power-law form of the primordial spectrum with
Planck CMB angular power spectrum data searching for possible smooth deviations
beyond the flexibility of the standard model. The departure from the
concordance cosmology is modeled in the context of Crossing statistic and
statistical significance of this deviation is used as a measure to test the
consistency of the standard model to the Planck data. Derived Crossing
functions suggest the presence of some broad features in angular spectrum
beyond the expectations of the concordance model. Our results indicate that the
concordance model of cosmology is consistent to the Planck data only at 2 to
3$\sigma$ confidence level if we allow smooth deviations from the angular power
spectrum given by the concordance model. This might be due to random
fluctuations or may hint towards smooth features in the primordial spectrum or
departure from another aspect of the standard model. Best fit Crossing
functions indicate that there are lack of power in the data at both low-$\ell$
and high-$\ell$ with respect to the concordance model. This hints that we may
need some modifications in the foreground modeling to resolve the significant
inconsistency at high-$\ell$. However, presence of some systematics at
high-$\ell$ might be another reason for the deviation we found in our analysis.


title: Quantum fisher information in noninertial frames

abstract:
  We investigate the performance of quantum fisher information under the
Unruh-Hawking effect, where one of the observers (eg, Rob) is uniformly
accelerated with respect to other partners. In the context of relativistic
quantum information theory, we demonstrate that quantum fisher information, as
an important measure of the information content of quantum states, has a rich
and subtle physical structure comparing with entanglement or Bell nonlocality.
In this work, we mainly focus on the parameterized (and arbitrary) pure
two-qubit states, where the weight parameter $\theta$ and phase parameter
$\phi$ are naturally introduced. Intriguingly, we prove that
$\mathcal{F}_\theta$ keeps unchanged for both scalar and Dirac fields.
Meanwhile, we observe that $\mathcal{F}_\phi$ decreases with the increase of
acceleration $r$ but remains finite in the limit of infinite acceleration. More
importantly, our results show that the symmetry of $\mathcal{F}_\phi$ (with
respect to $\theta=\pi/4$) has been broken by the influence of Unruh effect for
both cases.


title:
On the validity of the definition of angular momentum in general
  relativity

abstract:
  We exam the validity of the definition of the ADM angular momentum without
the parity assumption. Explicit examples of asymptotically flat hypersurfaces
in the Minkowski spacetime with zero ADM energy-momentum vector and finite
non-zero angular momentum vector are presented. We also discuss the Beig-\'O
Murchadha-Regge-Teitelboim center of mass and study analogous examples in the
Schwarzschild spacetime.


title:
Flight trajectory recreation and playback system of aerial mission based
  on ossimplanet

abstract:
  Recreation of flight trajectory is important among research areas. The design
of a flight trajectory recreation and playback system is presented in this
paper. Rather than transferring the flight data to diagram, graph and table,
flight data is visualized on the 3D global of ossimPlanet. ossimPlanet is an
open-source 3D global geo-spatial viewer and the system realization is based on
analysis it. Users are allowed to choose their interested flight of aerial
mission. The aerial photographs and corresponding configuration files in which
flight data is included would be read in. And the flight statuses would be
stored. The flight trajectory is then recreated. Users can view the photographs
and flight trajectory marks on the correct positions of 3D global. The scene
along flight trajectory is also simulated at the plane's eye point. This paper
provides a more intuitive way for recreation of flight trajectory. The cost is
decreased remarkably and security is ensured by secondary development on
open-source platform.


title:
Spin-superflow turbulence in spin-1 ferromagnetic spinor Bose-Einstein
  condensates

abstract:
  Spin-superflow turbulence (SST) in spin-1 ferromagnetic spinor Bose-Einstein
condensates is theoretically and numerically studied by using the spinor
Gross-Pitaevskii (GP) equations. SST is turbulence in which the disturbed spin
and superfluid velocity fields are coupled. Applying the Kolmogorov-type
dimensional scaling analysis to the hydrodynamic equations of spin and velocity
fields, we theoretically find that the -5/3 and -7/3 power laws appear in
spectra of the superflow kinetic and the spin-dependent interaction energy,
respectively. Our numerical calculation of the GP equations confirms SST with
the coexistence of disturbed spin and superfluid velocity field with two power
laws.


title:
Derivation of an Analytical Approximation of the Spectrum of Spinning
  Dust Emission

abstract:
  An analytical function for the spectrum of spinning dust emission is
presented. It is derived through the application of careful approximations,
with each step tested against numerical calculations. This approach ensures
accuracy while providing an intuitive picture of the physics. The final result
may be useful for fitting of anomalous microwave emission observations, as is
demonstrated by a comparison with the Planck observations of the Perseus
Molecular Cloud. It is hoped that this will lead to a broader consideration of
the spinning dust model when interpreting microwave continuum observations, and
that it will provide a standard framework for interpreting and comparing the
variety of anomalous microwave emission observations.


title:
Calculating the Habitable Zone of Multiple Star Systems
  (http://astro.twam.info/hz)

abstract:
  We have developed a comprehensive methodology and an interactive website for
calculating the habitable zone (HZ) of multiple star systems. Using the concept
of spectral weight factor, as introduced in our previous studies of the
calculations of HZ in and around binary star systems, we calculate the
contribution of each star (based on its spectral energy distribution) to the
total flux received at the top of the atmosphere of an Earth-like planet, and
use the models of the HZ of the Sun to determine the boundaries of the HZ in
multiple star systems. Our interactive website for carrying out these
calculations is publicly available at http://astro.twam.info/hz . We discuss
the details of our methodology and present its application to some of the
multiple star systems detected by the Kepler space telescope. We also present
the instructions for using our interactive website, and demonstrate its
capabilities by calculating the HZ for two interesting analytical solutions of
the three-body problem.


title:
Variations on twists of tuples of hyperelliptic curves and related
  results

abstract:
  Let $f\in\Q[x]$ be a square-free polynomial of degree $\geq 3$ and $m\geq 3$
be an odd positive integer. Based on our earlier investigations we prove that
there exists a function $D_{1}\in\Q(u,v,w)$ such that the Jacobians of the
curves \begin{equation*} C_{1}:\;D_{1}y^2=f(x),\quad
C_{2}:\;y^2=D_{1}x^m+b,\quad C_{3}:\;y^2=D_{1}x^m+c, \end{equation*} have all
positive ranks over $\Q(u,v,w)$. Similarly, we prove that there exists a
function $D_{2}\in\Q(u,v,w)$ such that the Jacobians of the curves
\begin{equation*} C_{1}:\;D_{2}y^2=h(x),\quad C_{2}:\;y^2=D_{2}x^m+b,\quad
C_{3}:\;y^2=x^m+cD_{2}, \end{equation*} have all positive ranks over
$\Q(u,v,w)$. Moreover, if $f(x)=x^m+a$ for some $a\in\Z\setminus\{0\}$, we
prove the existence of a function $D_{3}\in\Q(u,v,w)$ such that the Jacobians
of the curves \begin{equation*} C_{1}:\;y^2=D_{3}x^{m}+a,\quad
C_{2}:\;y^2=D_{3}x^m+b,\quad C_{3}:\;y^2=x^m+cD_{3}, \end{equation*} have all
positive ranks over $\Q(u,v,w)$. We present also some applications of these
results.
  Finally, we present some results concerning the torsion parts of the
Jacobians of the superelliptic curves $y^p=x^{m}(x+a)$ and $y^p=x^{m}(a-x)^{k}$
for a prime $p$ and $0<m<p-2$ and $k<p$ and apply our result in order to prove
the existence of a function $D\in\Q(u,v,w,t)$ such that the Jacobians of the
curves \begin{equation*} C_{1}:\;Dy^p=x^m(x+a),\quad Dy^p=x^m(x+b)
\end{equation*} have both positive rank over $\Q(u,v,w,t)$.


title: Topology of complete Finsler manifolds admitting convex functions

abstract:
  We study the topology of complete Finsler manifolds admitting convex
functions


title: Particle Gibbs with Ancestor Sampling

abstract:
  Particle Markov chain Monte Carlo (PMCMC) is a systematic way of combining
the two main tools used for Monte Carlo statistical inference: sequential Monte
Carlo (SMC) and Markov chain Monte Carlo (MCMC). We present a novel PMCMC
algorithm that we refer to as particle Gibbs with ancestor sampling (PGAS).
PGAS provides the data analyst with an off-the-shelf class of Markov kernels
that can be used to simulate the typically high-dimensional and highly
autocorrelated state trajectory in a state-space model. The ancestor sampling
procedure enables fast mixing of the PGAS kernel even when using seemingly few
particles in the underlying SMC sampler. This is important as it can
significantly reduce the computational burden that is typically associated with
using SMC. PGAS is conceptually similar to the existing PG with backward
simulation (PGBS) procedure. Instead of using separate forward and backward
sweeps as in PGBS, however, we achieve the same effect in a single forward
sweep. This makes PGAS well suited for addressing inference problems not only
in state-space models, but also in models with more complex dependencies, such
as non-Markovian, Bayesian nonparametric, and general probabilistic graphical
models.


title:
Tracing the Outflow of a z=0.334 FeLoBAL: New Constraints from
  Low-Ionization Absorbers in FBQS J1151+3822

abstract:
  We show for the first time that FBQS J1151+3822 is an iron low-ionization
broad absorption line quasar (FeLoBAL QSO), the second-brightest and
second-closest known example of this class. He I* and Fe II together act as an
effective analytical tool, allowing us to obtain useful kinematic constraints
from photoionization models of the outflow without needing to assume any
particular acceleration model. The main outflow's log ionization parameter is
-1.5, the log hydrogen density [cm^(-3)] 5.5 to 8, the log hydrogen column
density [cm^(-2)] 21.7 to 21.9, the absorption radius 7.2 to 127 pc, and the
kinetic luminosity 0.16% to 4.5% of the bolometric luminosity. We obtain
line-of-sight covering fractions of ~0.25 for strong Fe II, ~0.5 for He I*, and
~0.6 for Mg II. Narrower and shallower absorption lines from weaker Fe II and
Mn II with outflow velocity ~3400 km/s have appeared between 2005 and 2011,
suggesting that dense cores may have condensed inside the main outflow.
Consideration of the literature might suggest that the FBQS J1151+3822 outflow
is a member of a rare and distinct sub-class of FeLoBALs with high densities
and correspondingly small absorption radii. We find, however, that such
outflows are not necessarily a distinct sub-class, and that their apparent
rarity could be a symptom of selection bias in studies using density-sensitive
lines.


title:
Effect of ionic ordering in conductivity experiments of DNA aqueous
  solutions

abstract:
  The effects of ionic ordering in DNA water solutions are studied by
conductivity experiments. The conductivity measurements are performed for the
solutions of DNA with KCl salt in the temperature range from 28 to 70 C. Salt
concentration vary from 0 to 2 M. The conductivity of solutions without DNA but
with the same concentration of KCl salt are also performed. The results show
that in case of salt free solution of DNA the melting process of the double
helix is observed, while in case of DNA solution with added salt the
macromolecule denaturation is not featured. For salt concentrations lower than
some critical one (0.4 M) the conductivity of DNA solution is higher than the
conductivity of KCl water solution without DNA. Starting from the critical
concentration the conductivity of KCl solution is higher than the conductivity
of DNA solution with added salt. For description of the experimental data
phenomenological model is elaborated basing on electrolyte theory. In framework
of the developed model a mechanism of counterion ordering is introduced.
According to this mechanism under the low salt concentrations electrical
conductivity of the system is caused by counterions of DNA ion-hydrate shell.
Increasing the amount of salt to the critical concentration counterions
condense on DNA polyanion. Further increase of salt concentration leads to the
formation of DNA-salt complexes that decreases the conductivity of the system.


title:
Intrinsic paramagnetism and aggregation of manganese dopants in
  SrTiO$_3$

abstract:
  Using local-probe magnetic-characterization techniques of muon spin
relaxation ($\mu$SR) and electron spin resonance (ESR) we have investigated the
Mn-induced magnetism of the wide-bandgap perovskite SrTiO$_3$. Our results
clearly demonstrate that this diluted magnetic oxide (DMO) remains paramagnetic
down to low temperatures for both doping cases, i.e., when Mn substitutes for
Sr or Ti. In addition, both experimental techniques have unveiled that the
distribution of individual Mn$^{2+}$ and Mn$^{4+}$ ions is nonrandom, as these
ions partially aggregate into nanosized clusters.


title:
A Framework for Creating a Distributed Rendering Environment on the
  Compute Clusters

abstract:
  This paper discusses the deployment of existing render farm manager in a
typical compute cluster environment such as a university. Usually, both a
render farm and a compute cluster use different queue managers and assume total
control over the physical resources. But, taking out the physical resources
from an existing compute cluster in a university-like environment whose primary
use of the cluster is to run numerical simulations may not be possible. It can
potentially reduce the overall resource utilization in a situation where
compute tasks are more than rendering tasks. Moreover, it can increase the
system administration cost. In this paper, a framework has been proposed that
creates a dynamic distributed rendering environment on top of the compute
clusters using existing render farm managers without requiring the physical
separation of the resources.


title: Note on distribution free testing for discrete distributions

abstract:
  The paper proposes one-to-one transformation of the vector of components
$\{Y_{in}\}_{i=1}^m$ of Pearson's chi-square statistic,
\[Y_{in}=\frac{\nu_{in}-np_i}{\sqrt{np_i}},\qquad i=1,\ldots,m,\] into another
vector $\{Z_{in}\}_{i=1}^m$, which, therefore, contains the same "statistical
information," but is asymptotically distribution free. Hence any
functional/test statistic based on $\{Z_{in}\}_{i=1}^m$ is also asymptotically
distribution free. Natural examples of such test statistics are traditional
goodness-of-fit statistics from partial sums $\sum_{I\leq k}Z_{in}$. The
supplement shows how the approach works in the problem of independent interest:
the goodness-of-fit testing of power-law distribution with the Zipf law and the
Karlin-Rouault law as particular alternatives.


title:
Studying the baryon properties through chiral soliton model at finite
  temperature and denstity

abstract:
  We have studied the chiral soliton model in a thermal vacuum. The soliton
equations are solved at finite temperature and density. The temperature or
density dependent soliton solutions are presented. The physical properties of
baryons are derived from the soliton solutions at finite temperature and
density. The temperature or density dependent variation of the baryon
properties are discussed.


title: Kazhdan Lusztig and R polynomials of generalized Temperley Lieb algebras

abstract:
  We study two families of polynomials that play the same role, in the
generalized Temperley Lieb algebra of a Coxeter group, as the Kazhdan Lusztig
and R polynomials in the Hecke algebra of the group. Our results include
recursions, closed formulas, and other combinatorial properties for these
polynomials. We focus mainly on non branching Coxeter graphs.


title: A natural geometric construction underlying a class of Lax pairs

abstract:
  In the framework of the theory of differential coverings \cite{KV}, we
discuss a general geometric construction that serves the base for the so-called
Lax pairs containing differentiation with respect to the spectral parameter
\cite{OS}. Such kind of objects arise, for example, when studying integrability
properties of equations like the Gibbons-Tsarev one \cite{GT}.


title:
Revisiting the tunnelling site of electrons in strong field enhanced
  ionization of molecules

abstract:
  We investigated electron emissions in strong field enhanced ionization of
asymmetric diatomic molecules by quantum calculations. It is demonstrated that
the widely-used intuitive physical pic- ture, i.e., electron wave packet direct
ionization from the up-field site (DIU), is incomplete. Besides DIU, we find
another two new ionization channels, the field-induced excitation with
subsequent ionization from the down-field site (ESID), and the up-field site
(ESIU). The contributions from these channels depend on the molecular asymmetry
and internuclear distance. Our work provides a more comprehensive physical
picture for the long-standing issue about enhanced ionization of diatomic
molecules.


title:
Energy Density Functionals From the Strong-Coupling Limit Applied to the
  Anions of the He Isoelectronic Series

abstract:
  Anions and radicals are important for many applications including
environmental chemistry, semiconductors, and charge transfer, but are poorly
described by the available approximate energy density functionals. Here we test
an approximate exchange-correlation functional based on the exact
strong-coupling limit of the Hohenberg-Kohn functional on the prototypical case
of the He isoelectronic series with varying nuclear charge $Z<2$, which
includes weakly bound negative ions and a quantum phase transition at a
critical value of $Z$, representing a big challenge for density functional
theory. We use accurate wavefunction calculations to validate our results,
comparing energies and Kohn-Sham potentials, thus also providing useful
reference data close to and at the quantum phase transition. We show that our
functional is able to bind H$^-$ and to capture in general the physics of
loosely bound anions, with a tendency to strongly overbind that can be proven
mathematically. We also include corrections based on the uniform electron gas
which improve the results.


title: Message Encoding for Spread and Orbit Codes

abstract:
  Spread codes and orbit codes are special families of constant dimension
subspace codes. These codes have been well-studied for their error correction
capability and transmission rate, but the question of how to encode messages
has not been investigated. In this work we show how the message space can be
chosen for a given code and how message en- and decoding can be done.


title: Compatible finite element methods for numerical weather prediction

abstract:
  This article takes the form of a tutorial on the use of a particular class of
mixed finite element methods, which can be thought of as the finite element
extension of the C-grid staggered finite difference method. The class is often
referred to as compatible finite elements, mimetic finite elements, discrete
differential forms or finite element exterior calculus. We provide an
elementary introduction in the case of the one-dimensional wave equation,
before summarising recent results in applications to the rotating shallow water
equations on the sphere, before taking an outlook towards applications in
three-dimensional compressible dynamical cores.


title:
Topological phases due to the coexistence of superconductivity and
  spin-density wave: Application to high Tc superconductors in the underdoped
  regime

abstract:
  We consider the coexistence of superconductivity(SC) and spin-density
wave(SDW). The SC is presumed to be of $d_{x^2-y^2}+id_{xy} (d_1 + i d_2) $
type whereas the SDW order parameter is of $BCS$/$d_{x y} $ symmetry. The
Hamiltonian having such a structure is shown to have topological coexistence
phases in addition to the conventional one. It is shown that the amplitudes of
both the order parameters determine the nature of topological phases. A phase
diagram characterizing different topological phases with their Chern numbers
are obtained. The experimental realization of such topological phases with
reference to high temperature superconductors in the extreme underdoped regime
are discussed.


title: Pseudomeromorphic currents on subvarieties

abstract:
  Let $i\colon X \to Y$ be pure-dimensional reduced subvariety of a smooth
manifold $Y$. We prove that the direct image of pseudomeromorphic currents on
$X$ are pseudomeromorphic on $Y$. We also prove a partial converse: if
$i_*\tau$ is pseudomeromorphic and has the standard extension property, then
$\tau$ is pseudomermorphic on $X$.


title:
Kaon femtoscopy in $\sqrt{s_{NN}}$=200 GeV central Au+Au collsions at
  STAR

abstract:
  Three-dimensional analyses of the pion source revealed a heavy, non-Gaussian
tail in the direction of the pair transverse momentum. The interpretation of
these pion sources in terms of pure hydrodynamical evolution is, however,
complicated by the strong contribution of feed-down from long-lived resonances
to the source. On the other hand, kaons provide a much cleaner probe of the
expanding fireball. Here we present a recent three-dimensional kaon correlation
analysis using Cartesian harmonics decomposition technique. In contrary to
pions, the three-dimensional source function of kaons is largely Gaussian.
Comparison with thermal simulations and a hydrokinetic model show that
resonance decays, as well as non-zero emission duration and/or rescattering in
the hadronic phase play an important role. The analysis of the three
dimensional extent of the kaon source w.r.t. the pair transverse momentum
favors the hydrokinetic model over the exact mT-scaling featured by perfect
hydrodynamical models.


title:
Inclusive tau lepton hadronic decay in the framework of dispersive
  approach to QCD

abstract:
  The dispersive approach to QCD and its applications to inclusive tau lepton
hadronic decay and hadronic vacuum polarization function are briefly discussed.


title:
Phase modulation parallel optical delay detector for microwave
  angle-of-arrival measurement with accuracy monitored

abstract:
  A novel phase modulation parallel optical delay detector is proposed for
microwave angle-of-arrival (AOA) measurement with accuracy monitored by using
only one dual-electrode Mach-Zenhder modulator. A theoretical model is built up
to analyze the proposed system including measurement accuracy monitoring. The
spatial delay measurement is translated into the phase shift between two
replicas of a microwave signal. Thanks to the accuracy monitoring, the phase
shifts from 5{\deg} to 165{\deg} are measured with less than 3.1{\deg}
measurement error.


title: Lower Bound of Concurrence for Qubit Systems

abstract:
  We study the concurrence of four-qubit quantum states and provide analytical
lower bounds of concurrence in terms of the monogamy inequality of concurrence
for qubit systems. It is shown that these lower bounds are able to improve the
existing bounds and detect entanglement better. The approach is generalized to
arbitrary qubit systems.


title:
Magnetic particles confined in a modulated channel: structural
  transitions tunable by tilting a magnetic field

abstract:
  The ground state of colloidal magnetic particles in a modulated channel are
investigated as function of the tilt angle of an applied magnetic field. The
particles are confined by a parabolic potential in the transversal direction
while in the axial direction a periodic substrate potential is present. By
using Monte Carlo (MC) simulations, we construct a phase diagram for the
different crystal structures as a function of the magnetic field orientation,
strength of the modulated potential and the commensurability factor of the
system. Interestingly, we found first and second order phase transitions
between different crystal structures, which can be manipulated by the
orientation of the external magnetic field. A re-entrant behavior is found
between two- and four-chain configurations, with continuous second order
transitions. Novel configurations are found consisting of frozen in solitons.
By changing the orientation and/or strength of the magnetic field and/or the
strength and the spatial frequency of the periodic substrate potential, the
system transits through different phases.


title: The Up-Shot of Inelastic Down-Scattering at CDMS-Si

abstract:
  We study dark matter that inelastically scatters and de-excites in direct
detection experiments, as an interpretation of the CDMS-Si events in light of
the recent LUX data. The constraints from LUX and XENON10 require the
mass-splitting between the DM excited and de-excited states to be $|\delta|
\gtrsim 50$ keV. At the same time, the CDMS-Si data itself do not allow for a
consistent DM interpretation for mass splittings larger than $|\delta| \sim
$200 keV. We find that a low threshold analysis will be needed to rule out this
interpretation of the CDMS-Si events. In a simple model with a kinetically
mixed dark photon, we show that the CDMS-Si rate and the thermal relic
abundance can both be accommodated.


title: Space-Efficient String Indexing for Wildcard Pattern Matching

abstract:
  In this paper we describe compressed indexes that support pattern matching
queries for strings with wildcards. For a constant size alphabet our data
structure uses $O(n\log^{\varepsilon}n)$ bits for any $\varepsilon>0$ and
reports all $\mathrm{occ}$ occurrences of a wildcard string in $O(m+\sigma^g
\cdot\mu(n) + \mathrm{occ})$ time, where $\mu(n)=o(\log\log\log n)$, $\sigma$
is the alphabet size, $m$ is the number of alphabet symbols and $g$ is the
number of wildcard symbols in the query string. We also present an $O(n)$-bit
index with $O((m+\sigma^g+\mathrm{occ})\log^{\varepsilon}n)$ query time and an
$O(n(\log\log n)^2)$-bit index with $O((m+\sigma^g+\mathrm{occ})\log\log n)$
query time. These are the first non-trivial data structures for this problem
that need $o(n\log n)$ bits of space.


title: Effects of Lower Symmetry and Dimensionality on Raman Spectra in 2D WSe2

abstract:
  We report the observation and interpretation of new Raman peaks in few-layer
tungsten diselenide (WSe2), induced by the reduction of symmetry going from 3D
to 2D. In general, Raman frequencies in 2D materials follow quite closely the
frequencies of corresponding eigenmodes in the bulk. However, while the modes
that are Raman active in the bulk are also Raman active in the thin films, the
reverse is not always true due to the reduced symmetry in thin films. Here, we
predict from group theory and density functional calculations that two
intra-layer vibrational modes which are Raman inactive in bulk WSe2 in our
experimental configuration become Raman active in thin film WSe2, due to
reduced symmetry in thin films. This phenomenon explains the Raman peaks we
observe experimentally at ~310 cm-1 and 176 cm-1 in thin film WSe2.
Interestingly, the bulk mode at ~310 cm-1 that is Raman inactive can in fact be
detected in Raman measurements under specific wavelengths of irradiation,
suggesting that in this case, crystal symmetry selection rules may be broken
due to resonant scattering. Both theory and experiment indicate that the and
modes blue-shift with decreasing thickness, which we attribute to surface
effects. Our results shed light on a general understanding of the Raman/IR
activities of the phonon modes in layered transition metal dichalcogenide
materials and their evolution behavior from 3D to 2D.


title: Spin-Transfer-Torque Driven Magneto-Logic OR, AND and NOT Gates

abstract:
  We show that current induced magneto-logic gates like AND, OR and NOT can be
designed with the simple architecture involving a single nano spin-valve
pillar, as an extension of our recent work on spin-torque-driven magneto-logic
universal gates, NAND and NOR. Here the logical operation is induced by
spin-polarized currents which also form the logical inputs. The operation is
facilitated by the simultaneous presence of a constant controlling magnetic
field, in the absence of which the same element operates as a magnetoresistive
memory element. We construct the relevant phase space diagrams for the free
layer magnetization dynamics in the monodomain approximation and show the
rationale and functioning of the proposed gates. The flipping time for the
logical states of these non-universal gates is estimated to be within nano
seconds, just like their universal counter parts.


title:
Quantitative isoperimetric inequalities for log-convex probability
  measures on the line

abstract:
  The purpose of this paper is to analyze the isoperimetric inequality for
symmetric log-convex probability measures on the line. Using geometric
arguments we first re-prove that extremal sets in the isoperimetric inequality
are intervals or complement of intervals (a result due to Bobkov and Houdr\'e).
Then we give a quantitative form of the isoperimetric inequality, leading to a
somehow anomalous behavior. Indeed, it could be that a set is very close to be
optimal, in the sense that the isoperimetric inequality is almost an equality,
but at the same time is very far (in the sense of the symmetric difference
between sets) to any extremal sets! From the results on sets we derive
quantitative functional inequalities of weak Cheeger type.


title: Of course we share! Testing Assumptions about Social Tagging Systems

abstract:
  Social tagging systems have established themselves as an important part in
today's web and have attracted the interest from our research community in a
variety of investigations. The overall vision of our community is that simply
through interactions with the system, i.e., through tagging and sharing of
resources, users would contribute to building useful semantic structures as
well as resource indexes using uncontrolled vocabulary not only due to the
easy-to-use mechanics. Henceforth, a variety of assumptions about social
tagging systems have emerged, yet testing them has been difficult due to the
absence of suitable data. In this work we thoroughly investigate three
available assumptions - e.g., is a tagging system really social? - by examining
live log data gathered from the real-world public social tagging system
BibSonomy. Our empirical results indicate that while some of these assumptions
hold to a certain extent, other assumptions need to be reflected and viewed in
a very critical light. Our observations have implications for the design of
future search and other algorithms to better reflect the actual user behavior.


title: The laminar-turbulent transition in a fibre laser

abstract:
  Studying transition to a highly disordered state of turbulence from a
linearly stable coherent laminar state is conceptually and technically
challenging and immensely important, e.g. all pipe and channel flows are of
that type. In optics, understanding how systems lose coherence with increase of
spatial size or excitation level is an open fundamental problem of practical
importance. Here we identify, arguably, the simplest system where this
classical problem can be studied: we learnt to operate a fibre laser in laminar
and turbulent regimes. We show that laminar phase is an analogue of a
one-dimensional coherent condensate and turbulence onset is through a spatial
loss of coherence. We discover a new mechanism of laminar-turbulent transition
in laser operation: condensate destruction by the clustering of dark and grey
solitons. This is important both for the design of devices exploiting coherent
dynamics and for conceptually new technologies based on systems operating far
from thermodynamic equilibrium.


title: Relative Deligne cohomology and Cheeger-Simons characters

abstract:
  In the paper [1] (arXiv:math/0408333) the authors discuss two possible
definitions of the relative Cheeger-Simons characters, the second one fitting
into a long exact sequence. Here we relate that picture to the one of the
relative Deligne cohomology groups, defined via the mapping cone: we show that
there are three meaningful relative groups, and we analyze the corresponding
definition of relative Cheeger-Simons characters in each case. We then extract
another definition, corresponding to the one fitting into a long exact sequence
in [1]. Finally we show how the explicit formulas for the holonomy, the
transgression maps and the integration can be extended to the relative case.


title:
Complete constant mean curvature spacelike hypersurfaces in the
  Einstein-de Sitter spacetime

abstract:
  Uniqueness and non-existence results on complete constant mean curvature
spacelike hypersurfaces lying between two spacelike slice in the Einstein-de
Sitter spacetime are given. They are obtained from a Liouvielle-type theorem
applied to a distinguished smooth function on a constant mean curvature
hypersurface.


title: Intensity-Intensity Correlations of Classically Entangled Light

abstract:
  An experiment is proposed to show that after initial frequency and
polarization selection, classical thermal light from two independent sources
can be made path-polarization entangled. Such light will show new
intensity-intensity correlations involving both path and polarization phases,
formally similar to those for four-particle GHZ states. For fixed polarization
phases, the correlations reduce to the Hanbury Brown-Twiss phase correlations.
It is also shown that these classical correlations violate noncontextuality.


title: Photocouplings at the Pole from Pion Photoproduction

abstract:
  The reactions $\gamma p\to\pi^0 p$ and $\gamma p\to\pi^+ n$ are analyzed in a
semi-phenomenological approach up to $E\sim2.3$ GeV. Fits to differential cross
section and single and double polarization observables are performed. A good
overall reproduction of the available photoproduction data is achieved. The
J\"ulich2012 dynamical coupled-channel model -which describes elastic $\pi N$
scattering and the world data base of the reactions $\pi N\to\eta N$,
$K\Lambda$, and $K\Sigma$ at the same time - is employed as the hadronic
interaction in the final state. The framework guarantees analyticity and, thus,
allows for a reliable extraction of resonance parameters in terms of poles and
residues. In particular, the photocouplings at the pole can be extracted and
are presented.


title: On the SW Sex-Type Eclipsing Cataclysmic Variable SDSS0756+0858

abstract:
  We conducted a spectroscopic and photometric study of SDSS J075653.11+085831.
X-ray observations were also attempted. We determined the orbital period of
this binary system to be 3.29 hr. It is a deep eclipsing system, whose spectra
shows mostly single-peaked Balmer emission lines and a rather intense He II
line. There is also the presence of faint (often double-peaked) He I emission
lines as well as several absorption lines, Mg I being the most prominent. All
of these features point towards the affiliation of this object with the growing
number of SW~Sex-type objects. We developed a phenomenological model of an
SW~Sex system to reproduce the observed photometric and spectral features.


title: Infrared light extinction by charged dielectric core-coat particles

abstract:
  We study the effect of surplus electrons on the infrared extinction of
dielectric particles with a core-coat structure and propose to use it for an
optical measurement of the particle charge in a dusty plasma. The particles
consist of an inner core with negative and an outer coat with positive electron
affinity. Both the core and the coat give rise to strong transverse optical
phonon resonances, leading to anomalous light scattering in the infrared. Due
to the radial profile of the electron affinity electrons accumulate in the coat
region making the infrared extinction of this type of particles very
charge-sensitive, in particular, the extinction due to a resonance arising
solely due to the core-coat structure. The maximum of this resonance is in the
far-infrared and responds to particle charges realizable in ordinary dusty
laboratory plasmas.


title: Semigroup presentations for test local groups

abstract:
  In this paper we exhibit a type of semigroup presentations which determines a
class of local groups. We show that the finite elements of this class generate
the pseudovariety ${\bf LG}$ of all finite local groups and use them as
test-semigroups to prove that ${\bf LG}$ and ${\bf S}$, the pseudovariety of
all finite semigroups, verify the same $\kappa$-identities involving
$\kappa$-terms of rank at most 1, where $\kappa$ denotes the implicit signature
consisting of the multiplication and the $(\omega-1)$-power.


title:
Convergence rate and acceleration of Clenshaw-Curtis quadrature for
  functions with endpoint singularities

abstract:
  In this paper, we investigate the rate of convergence of Clenshaw-Curtis
quadrature and its acceleration for functions with endpoint singularities in
X^s, where X^s denotes the space of functions whose Chebyshev coefficients
decay asymptotically as a_k = O(k^{-s-1}) for some positive s. For such
unctions, we show that the convergence rate of (n + 1)-point Clenshaw-Curtis
quadrature is O(n^{-s-2}). Furthermore, an asymptotic error expansion for
Clenshaw-Curtis quadrature is presented which enables us to employ some
extrapolation techniques to accelerate its convergence. Numerical examples are
provided to confirm our analysis.


title: Pomeron in the N=4 SYM at strong couplings

abstract:
  We show the result for the BFKL Pomeron intercept at N=4 Supersymmetric
Yang-Mills model in the form of the inverse coupling expansion j0=2-2
lambda**(-1/2)- lambda**(-1) + 1/4 lambda**(-3/2) + 2(1+3zeta3) lambda**(-2) +
O(lambda**(-5/2)), which has been calculated recently in [1] with the use of
the AdS/CFT correspondence.


title: Multi-Topic Multi-Document Summarizer

abstract:
  Current multi-document summarization systems can successfully extract summary
sentences, however with many limitations including: low coverage, inaccurate
extraction to important sentences, redundancy and poor coherence among the
selected sentences. The present study introduces a new concept of centroid
approach and reports new techniques for extracting summary sentences for
multi-document. In both techniques keyphrases are used to weigh sentences and
documents. The first summarization technique (Sen-Rich) prefers maximum
richness sentences. While the second (Doc-Rich), prefers sentences from
centroid document. To demonstrate the new summarization system application to
extract summaries of Arabic documents we performed two experiments. First, we
applied Rouge measure to compare the new techniques among systems presented at
TAC2011. The results show that Sen-Rich outperformed all systems in ROUGE-S.
Second, the system was applied to summarize multi-topic documents. Using human
evaluators, the results show that Doc-Rich is the superior, where summary
sentences characterized by extra coverage and more cohesion.


title: Poisson geometry of the Maxwell-Bloch top system and stability problem

abstract:
  Dynamics of Maxwell-Bloch top system, that includes Maxwell-Bloch and
Lorenz-Hamilton equations as particular cases, is studied in the framework
Poisson geometry. Constants of motion as well as the relation of solution to
that of pendulum are presented. Equilibrium states are determined and their
complete stability analysis are performed. Results are applied to an optimal
control problem on the Lie group G4.


title:
Electrical-Field Distributions in Waveguide Arrays - Exact and
  Approximate

abstract:
  Five methods of calculating electrical field distributions in one dimensional
wave-guide arrays are reviewed. We analytically solve the scalar Helmholtz
Equation and, based on the computed Bloch functions and associated bands of
propagation constants, generate the exact field distribution maps. For the
approximated slowly varying envelope equation we show that the base Bloch
functions are identical to those in the exact case, and study the differences
in the bands of propagation constants. We demonstrate that by selecting the
reference refractive index value, it is possible to minimize the error in
propagation constants of any desired band. For the distributions calculated by
the coupled mode theory, we reveal the similarity and differences of the band
made of eigenvalues of the coupled mode equations matrix when compared to the
first band of propagation constants found by the exact solution. Analysis of
two numeric beam propagation methods shows that the relative accuracy of the
calculated field distributions of each of these methods depends on excitation
conditions. The presented analysis of the slowly varying envelope equation
provides guide lines for selecting the value of the reference refractive index
to be incorporated in these numeric methods where an analytic solution is
difficult to work out or in the frequently occurring cases where an analytic
solution does not exist at all.


title:
Nonlinear evolution of tidally forced inertial waves in rotating fluid
  bodies

abstract:
  We perform one of the first studies into the nonlinear evolution of tidally
excited inertial waves in a uniformly rotating fluid body, exploring a
simplified model of the fluid envelope of a planet (or the convective envelope
of a solar-type star) subject to the gravitational tidal perturbations of an
orbiting companion. Our model contains a perfectly rigid spherical core, which
is surrounded by an envelope of incompressible uniform density fluid. The
corresponding linear problem was studied in previous papers which this work
extends into the nonlinear regime, at moderate Ekman numbers (the ratio of
viscous to Coriolis accelerations). By performing high-resolution numerical
simulations, using a combination of pseudo-spectral and spectral element
methods, we investigate the effects of nonlinearities, which lead to
time-dependence of the flow and the corresponding dissipation rate. Angular
momentum is deposited non-uniformly, leading to the generation of significant
differential rotation in the initially uniformly rotating fluid, i.e. the body
does not evolve towards synchronism as a simple solid body rotator. This
differential rotation modifies the properties of tidally excited inertial
waves, changes the dissipative properties of the flow, and eventually becomes
unstable to a secondary shear instability provided that the Ekman number is
sufficiently small. Our main result is that the inclusion of nonlinearities
eventually modifies the flow and the resulting dissipation from what linear
calculations would predict, which has important implications for tidal
dissipation in fluid bodies. We finally discuss some limitations of our
simplified model, and propose avenues for future research to better understand
the tidal evolution of rotating planets and stars.