title: Excitonic Superfluidity and Screening in Electron-Hole Bilayer Systems

abstract:
  Superfluidity in e-h bilayers in graphene and GaAs has been predicted many
times but not observed. A key problem is how to treat the screening of the
Coulomb interaction for pairing. Different mean-field theories give
dramatically different conclusions, and we test them against diffusion
Monte-Carlo calculations. We get excellent agreement with the mean-field theory
that uses screening in the superfluid state, but large discrepancies with the
others. The theory predicts no superfluidity in existing devices and gives
pointers for new devices to generate superfluidity.


title:
Mass and chirality inversion of a Dirac cone pair in St\"{u}ckelberg
  interferometry

abstract:
  We show that a St\"{u}ckelberg interferometer made of two massive Dirac cones
can reveal information on band eigenstates such as the chirality and mass sign
of the cones. For a given spectrum with two gapped cones, we propose several
low-energy Hamiltonians differing by their eigenstates properties. The
corresponding inter-band transition probability is affected by such differences
in its interference fringes being shifted by a new phase of geometrical origin.
This phase can be a useful bulk probe for topological band structures realized
with artificial crystals.


title:
Three-dimensional MHD modeling of propagating disturbances in fan-like
  coronal loops

abstract:
  Quasi-periodic propagating intensity disturbances (PDs) have been observed in
large coronal loops in EUV images over a decade, and are widely accepted to be
slow magnetosonic waves. However, spectroscopic observations from Hinode/EIS
revealed their association with persistent coronal upflows, making this
interpretation debatable. Motivated by the scenario that the coronal upflows
could be cumulative result of numerous individual flow pulses generated by
sporadic heating events (nanoflares) at the loop base, we construct a velocity
driver with repetitive tiny pulses, whose energy frequency distribution follows
the flare power-law scaling. We then perform 3D MHD modeling of an idealized
bipolar active region by applying this broadband velocity driver at the
footpoints of large coronal loops which appear open in the computational
domain. Our model successfully reproduces the PDs with similar features as the
observed, and shows that any upflow pulses inevitably excite slow magnetosonic
wave disturbances propagating along the loop. We find that the generated PDs
are dominated by the wave signature as their propagation speeds are consistent
with the wave speed in the presence of flows, and the injected flows rapidly
decelerate with height. Our simulation results suggest that the observed PDs
and associated persistent upflows may be produced by small-scale impulsive
heating events (nanoflares) at the loop base, and that the flows and waves may
both contribute to the PDs at lower heights.


title: Suzaku Observations of the X-ray Brightest Fossil Group ESO 3060170

abstract:
  "Fossil" galaxy groups, each dominated by a relatively isolated giant
elliptical galaxy, have many properties intermediate between groups and
clusters of galaxies. We used the {\sl Suzaku} X-ray observatory to observe the
X-ray brightest fossil group, ESO 3060170, out to $R_{200}$, in order to better
elucidate the relation between fossil groups, normal groups, and clusters. We
determined the intragroup gas temperature, density, and metal abundance
distributions and derived the entropy, pressure and mass profiles for this
group. The entropy and pressure profiles in the outer regions are flatter than
in simulated clusters, similar to what is seen in observations of massive
clusters. This may indicate that the gas is clumpy and/or the gas has been
redistributed. Assuming hydrostatic equilibrium, the total mass is estimated to
be $\sim1.7\times10^{14}$ $M_{\odot}$ within a radius $R_{200}$ of $\sim1.15$
Mpc, with an enclosed baryon mass fraction of 0.14. The integrated iron
mass-to-light ratio of this fossil group is larger than in most groups and
comparable to those of clusters, indicating that this fossil group has retained
the bulk of its metals. A galaxy luminosity density map on a scale of 25 Mpc
shows that this fossil group resides in a relatively isolated environment,
unlike the filamentary structures in which typical groups and clusters are
embedded.


title:
Dynamics of a tagged monomer: Effects of elastic pinning and harmonic
  absorption

abstract:
  We study the dynamics of a tagged monomer of a Rouse polymer for different
initial configurations. In the case of free evolution, the monomer displays
subdiffusive behavior with strong memory of the initial state. In presence of
either elastic pinning or harmonic absorption, we show that the steady state is
independent of the initial condition which however strongly affects the
transient regime, resulting in non-monotonous behavior and power-law relaxation
with varying exponents.


title:
Thermodynamic properties of the new multiferroic material
  (NH$_4$)$_2$[FeCl$_5$(H$_2$O)]

abstract:
  (NH$_4$)$_2$[FeCl$_5$(H$_2$O)], a member of the family of antiferromagnetic
$A_2$[Fe$X_5$(H$_2$O)] compounds ($X$ = halide ion, $A$ = alkali metal or
ammonium ion) is classified as a new multiferroic material. We report the onset
of ferroelectricity below ~6.9 K within an antiferromagnetically ordered state
($T_N \sim 7.25 K$). The corresponding electric polarization can drastically be
influenced by applying magnetic fields. Based on measurements of pyroelectric
currents, dielectric constants and magnetization we characterize the
magnetoelectric, dielectric and magnetic properties of
(NH$_4$)$_2$[FeCl$_5$(H$_2$O)]. Combining these data with measurements of
thermal expansion, magnetostriction and specific heat, we derive detailed
magnetic field versus temperature phase diagrams. Depending on the direction of
the magnetic field up to three different multiferroic phases are identified,
which are separated by a magnetically ordered, but non-ferroelectric phase from
the paramagnetic phase. Besides these low-temperature transitions, we observe
an additional phase transition at ~79 K, which we suspect to be of structural
origin.


title:
On the joint analysis of CMB temperature and lensing-reconstruction
  power spectra

abstract:
  Gravitational lensing provides a significant source of cosmological
information in modern CMB parameter analyses. It is measured in both the power
spectrum and trispectrum of the temperature fluctuations. These observables are
often treated as independent, although as they are both determined from the
same map this is impossible. In this paper, we perform a rigorous analysis of
the covariance between lensing power spectrum and trispectrum analyses. We find
two dominant contributions coming from: (i) correlations between the
disconnected noise bias in the trispectrum measurement and sample variance in
the temperature power spectrum; and (ii) sample variance of the lenses
themselves. The former is naturally removed when the dominant N0 Gaussian bias
in the reconstructed deflection spectrum is dealt with via a partially
data-dependent correction, as advocated elsewhere for other reasons. The
remaining lens-cosmic-variance contribution is easily modeled but can safely be
ignored for a Planck-like experiment, justifying treating the two observable
spectra as independent. We also test simple likelihood approximations for the
deflection power spectrum, finding that a Gaussian with a parameter-independent
covariance performs well.


title: Highlights from the VERITAS Blazar Program

abstract:
  VERITAS is an array of four 12-m imaging Cherenkov telescopes, sensitive to
gamma rays in the energy range from 85 GeV to 30 TeV. VERITAS dedicates roughly
40% of its total observing time to blazars. We present recent highlights from
the VERITAS blazar discovery and long-term monitoring programs. These
observations have led to 25 blazar detections, including 10 VHE discoveries.
The VERITAS cameras were recently upgraded, lowering the energy threshold and
enhancing the sensitivity. This upgrade helped to establish four new blazar
detections with data taken after the completion of the upgrade in summer 2012.


title:
A characterization of hyperbolic affine flat, affine minimal surfaces in
  $\mathbb{A}^3$

abstract:
  We investigate the geometric properties of hyperbolic affine flat, affine
minimal surfaces in the equiaffine space $\mathbb{A}^3$. We use Cartan's method
of moving frames to compute a complete set of local invariants for such
surfaces. Using these invariants, we give a complete local classification of
such surfaces and construct new examples.


title:
Are entangled particles connected by wormholes? Support for the ER=EPR
  conjecture from entropy inequalities

abstract:
  If spacetime is built out of quantum bits, does the shape of space depend on
how the bits are entangled? The ER=EPR conjecture relates the entanglement
entropy of a collection of black holes to the cross sectional area of
Einstein-Rosen (ER) bridges (or wormholes) connecting them. We show that the
geometrical entropy of classical ER bridges satisfies the subadditivity,
triangle, strong subadditivity, and CLW inequalities. These are nontrivial
properties of entanglement entropy, so this is evidence for ER=EPR. We further
show that the entanglement entropy associated to classical ER bridges has
nonpositive interaction information. This is not a property of entanglement
entropy, in general. For example, the entangled four qubit pure state
|GHZ_4>=(|0000>+|1111>)/\sqrt{2} has positive interaction information, so this
state cannot be described by a classical ER bridge. Large black holes with
massive amounts of entanglement between them can fail to have a classical ER
bridge if they are built out of |GHZ_4> states. States with nonpositive
interaction information are called monogamous. We conclude that classical ER
bridges require monogamous EPR correlations.


title:
Sparse Dictionary-based Attributes for Action Recognition and
  Summarization

abstract:
  We present an approach for dictionary learning of action attributes via
information maximization. We unify the class distribution and appearance
information into an objective function for learning a sparse dictionary of
action attributes. The objective function maximizes the mutual information
between what has been learned and what remains to be learned in terms of
appearance information and class distribution for each dictionary atom. We
propose a Gaussian Process (GP) model for sparse representation to optimize the
dictionary objective function. The sparse coding property allows a kernel with
compact support in GP to realize a very efficient dictionary learning process.
Hence we can describe an action video by a set of compact and discriminative
action attributes. More importantly, we can recognize modeled action categories
in a sparse feature space, which can be generalized to unseen and unmodeled
action categories. Experimental results demonstrate the effectiveness of our
approach in action recognition and summarization.


title: Schr\"odinger Equation on Fractals Curves Imbedding in $R^3$

abstract:
  In this paper we have generalized the quantum mechanics on fractal
time-space. The time is changing on Cantor-set like but space is considered as
fractal curve like Von-Koch curve. The Feynman path method in quantum mechanics
has been suggested on fractal curve. Using $F^{\alpha}$-calculus and Feynman
path method we found the Schr\"{e}dinger on fractal time-space. The Hamiltonian
operator and momentum operator has been derived. More, the continuity equation
and the probability density is given in generalized formulation.


title:
Temporal evolution of adherents of the major religions in Mexico: Avrami
  model application-Kolgomorov solid training

abstract:
  It applies a mathematical model of solid formation, the model of
Avrami-Kolgomorov [Ausloos & Petroni, 2007] to model the time evolution of
percentage of adherents of the major religions practiced in Mexico, adjusting
the corresponding parameters with available records in the period from 1950 to
2000 [Molina-Hernandez, 2003; INEGI, 2005]. A comparison is made with the
application of the model to global trends and concludes that Catholicism is in
a marked disaggregation and trends of Christianity in Mexico are similar to
global.


title: High energy factorization at NLO: Lipatov's effective action revisited

abstract:
  We discuss aspects of our recent derivation of the gluon Regge trajectory at
two loop from Lipatov's high energy effective action. We show how the gluon
Regge trajectory can be rigorously defined through renormalization of the high
energy divergence of the reggeized gluon propagator. We furthermore provide
some details on the determination of the two-loop reggeized gluon self-energy.


title: Multiple quantum phase transitions in a heavy fermion antiferromagnet

abstract:
  We report measurements of magnetic quantum oscillations and specific heat at
low temperatures across a field-induced antiferromagnetic quantum critical
point (QCP)(B_{c0}\approx50T) of the heavy-fermion metal CeRhIn_5. A sharp
magnetic-field induced Fermi surface reconstruction is observed inside the
antiferromagnetic phase. Our results demonstrate multiple classes of QCPs in
the field-pressure phase diagram of this heavy-fermion metal, pointing to a
universal description of QCPs. They also suggest that robust superconductivity
is promoted by unconventional quantum criticality of a fluctuating Fermi
surface.


title:
Natural Electroweak Symmetry Breaking from Scale Invariant Higgs
  Mechanism

abstract:
  We construct a minimal viable extension of the standard model (SM) with
classical scale symmetry. Its scalar sector contains a complex singlet in
addition to the SM Higgs doublet. The scale-invariant and CP-symmetric Higgs
potential generates radiative electroweak symmetry breaking a la
Coleman-Weinberg, and gives a natural solution to the hierarchy problem, free
from fine-tuning. Besides the 125GeV SM-like Higgs particle, it predicts a new
CP-even Higgs (serving as the pseudo-Nambu-Goldstone boson of scale symmetry
breaking) and a CP-odd scalar singlet (providing the dark matter candidate) at
weak scale. We systematically analyze experimental constraints from direct LHC
Higgs searches and electroweak precision tests, as well as theoretical bounds
from unitarity, triviality and vacuum stability. We demonstrate the viable
parameter space, and discuss implications for new Higgs and dark matter (DM)
searches at the upcoming LHC runs and for the on-going direct detections of DM.


title: Branching laws for small unitary representations of GL(n,C)

abstract:
  The unitary principal series representations of $G=GL(n,\mathbb{C})$ induced
from a character of the maximal parabolic subgroup $P=(GL(1,\mathbb{C})\times
GL(n-1,\mathbb{C}))\ltimes\mathbb{C}^{n-1}$ attain the minimal
Gelfand--Kirillov dimension among all infinite-dimensional unitary
representations of $G$. We find the explicit branching laws for the restriction
of these representations to symmetric subgroups of $G$.


title: Constraints on Higgs Properties and SUSY Partners in the pMSSM

abstract:
  Direct searches for superpartners and precision measurements of the
properties of the $\sim 126$ GeV Higgs boson lead to important inter-dependent
constraints on the underlying parameter space of the MSSM. The 19/20-parameter
p(henomenological)MSSM offers a flexible framework for the study of a wide
variety of both Higgs and SUSY phenomena at the LHC and elsewhere. Within this
scenario we address the following questions: `What will potentially null
searches for SUSY at the LHC tell us about the possible properties of the Higgs
boson?' and, conversely, `What do precision measurements of the properties of
the Higgs tell us about the possible properties of the various superpartners?'
Clearly the answers to such questions will be functions of both the collision
energy of the LHC as well as the accumulated integrated luminosity. We address
these questions employing several sets of pMSSM models having either neutralino
or gravitino LSPs, making use of the ATLAS SUSY analyses at the 7/8 TeV LHC as
well as planned SUSY and Higgs analyses at the 14 TeV LHC and the ILC. Except
for theoretical uncertainties that remain to be accounted for in the ratios of
SUSY and SM couplings, we demonstrate that Higgs coupling measurements at the
14 TeV LHC, and particularly at the 500 GeV ILC, will be sensitive to regions
of the pMSSM model space that are not accessible to direct SUSY searches.


title:
Estimates for the restriction of automorphic forms on hyperbolic
  manifolds to compact geodesic cycles

abstract:
  We find estimates for the restriction of automorphic forms on hyperbolic
manifolds to compact geodesic cycles. The geodesic cycles we study are
themselves hyperbolic manifolds of lower dimension. The restriction of an
automorphic form to such a geodesic cycle can be expanded into eigenfunctions
of the Laplacian on the geodesic cycle. We prove exponential decay for the
coefficients in this expansion.


title:
Exact and Heuristic Methods for the Assembly Line Worker Assignment and
  Balancing Problem

abstract:
  In traditional assembly lines, it is reasonable to assume that task execution
times are the same for each worker. However, in sheltered work centres for
disabled this assumption is not valid: some workers may execute some tasks
considerably slower or even be incapable of executing them. Worker
heterogeneity leads to a problem called the assembly line worker assignment and
balancing problem (ALWABP). For a fixed number of workers the problem is to
maximize the production rate of an assembly line by assigning workers to
stations and tasks to workers, while satisfying precedence constraints between
the tasks. This paper introduces new heuristic and exact methods to solve this
problem. We present a new MIP model, propose a novel heuristic algorithm based
on beam search, as well as a task-oriented branch-and-bound procedure which
uses new reduction rules and lower bounds for solving the problem. Extensive
computational tests on a large set of instances show that these methods are
effective and improve over existing ones.


title: Snyder Momentum Space in Relative Locality

abstract:
  The standard approaches of phenomenology of Quantum Gravity have usually
explicitly violated Lorentz invariance, either in the dispersion relation or in
the addition rule for momenta. We investigate whether it is possible in 3+1
dimensions to have a non local deformation that preserves fully Lorentz
invariance, as it is the case in 2+1D Quantum Gravity. We answer positively to
this question and show for the first time how to construct a homogeneously
curved momentum space preserving the full action of the Lorentz group in
dimension 4 and higher, despite relaxing locality. We study the property of
this relative locality deformation and show that this space leads to a
noncommutativity related to Snyder spacetime.


title:
Local Structural Evidence for Strong Electronic Correlations in
  LiRh$_2$O$_4$ Spinel

abstract:
  The local structure of the spinel LiRh$_2$O$_4$ has been studied using atomic
pair distribution function (PDF) analysis of powder x-ray diffraction data.
This measurement is sensitive to the presence of short Rh-Rh bonds that form
due to dimerization of Rh$^{4+}$ ions on the pyrochlore sublattice, independent
of the existence of long range order. We show that structural dimers exist in
the low-temperature phase, as previously supposed, with a bond shortening of
$\Delta r \sim 0.15$ \AA . The dimers persist up to 350 K, well above the
insulator-metal transition, with $\Delta r$ decreasing in magnitude on warming.
Such behavior is inconsistent with the Fermi surface nesting-driven Peierls
transition model. Instead, we argue that LiRh$_2$O$_4$ should properly be
described as a strongly correlated system.


title:
The Maximal Abelian Gauge in SU(N) Gauge Theories and Thermal Monopoles
  for N = 3

abstract:
  We discuss and propose a proper extension of the Abelian projection based on
the Maximal Abelian Gauge to SU(N) gauge theories. Based, on that, we
investigate the properties of thermal Abelian monopoles in the deconfined phase
of the SU(3) pure gauge theory. Such properties are very similar to those
already found for SU(2), confirming the relevance of the magnetic component
close to Tc and the possible condensation of thermal monopoles as the
deconfinement temperature is crossed from above. Moreover, we study the
correlation functions among monopoles related to different U(1) subgroups,
which show interesting features and reveal the presence of non-trivial
interactions.


title:
Kerman-Onishi conditions in self-consistent tilted-axis-cranking
  mean-field calculations

abstract:
  \item[Background] For cranked mean-field calculations with arbitrarily
oriented rotational frequency vector $\boldsymbol{\omega}$ in the intrinsic
frame, one has to employ constraints on average values of the quadrupole-moment
tensor, so as to keep the nucleus in the principal-axis reference frame. Kerman
and Onishi [Nucl. Phys. A {\bf 361}, 179 (1981)] have shown that the Lagrangian
multipliers that correspond to the required constraints are proportional to
$\boldsymbol{\omega} \times \boldsymbol{J}$, where $\boldsymbol{J}$ is the
average angular momentum vector.
  \item[Purpose] We study the validity and consequences of the Kerman-Onishi
conditions in the context of self-consistent tilted-axis-cranking (TAC)
mean-field calculations.
  \item[Methods] We perform a two-dimensional self-consistent calculations
(with and without pairing) utilizing the symmetry-unrestricted solver {\sc
hfodd}. At each tilting angle, we compare the calculated values of
quadrupole-moment-tensor Lagrangian multipliers and $\boldsymbol{\omega} \times
\boldsymbol{J}$.
  \item[Results] We show that in self-consistent calculations, the
Kerman-Onishi conditions are obeyed with high precision. Small deviations seen
in the calculations with pairing can be attributed to the truncation of the
quasiparticle spectrum. We also provide results of systematic TAC calculations
for triaxial strongly deformed bands in $^{160}$Yb.
  \item[Conclusions] For non-stationary TAC solutions, Kerman-Onishi conditions
link the non-zero values of the angle between rotational-frequency and
angular-momentum vectors to the constraints on off-diagonal components of the
quadrupole-moment tensor. To stabilize the convergence of self-consistent
iterations, such constraints have to be taken into account. Only then one can
determine the Routhian surfaces as functions of the tilting angles.


title: Cosmic censorship in Lovelock theory

abstract:
  In analyzing maximally symmetric Lovelock black holes with non-planar horizon
topologies, many novel features have been observed. The existence of finite
radius singularities, a mass gap in the black hole spectrum and solutions
displaying multiple horizons are noteworthy examples. Naively, in all these
cases, the appearance of naked singularities seems unavoidable, leading to the
question of whether these theories are consistent gravity theories. We address
this question and show that whenever the cosmic censorship conjecture is
threaten, an instability generically shows up driving the system to a new
configuration with presumably no naked singularities. Also, the same kind of
instability shows up in the process of spherical black holes evaporation in
these theories, suggesting a new phase for their decay. We find circumstantial
evidence indicating that, contrary to many claims in the literature, the cosmic
censorship hypothesis holds in Lovelock theory.


title: The Multi-Species Farley-Buneman Instability in the Solar Chromosphere

abstract:
  Empirical models of the solar chromosphere show intense electron heating
immediately above its temperature minimum. Mechanisms such as resistive
dissipation and shock waves appear insufficient to account for the persistence
and uniformity of this heating as inferred from both UV lines and continuum
measurements. This paper further develops the theory of the Farley-Buneman
Instability (FBI) which could contribute substantially to this heating. It
expands upon the single ion theory presented by Fontenla (2005) by developing a
multiple ion species approach that better models the diverse, metal-dominated
ion plasma of the solar chromosphere. This analysis generates a linear
dispersion relationship that predicts the critical electron drift velocity
needed to trigger the instability. Using careful estimates of collision
frequencies and a one-dimensional, semi-empirical model of the chromosphere,
this new theory predicts that the instability may be triggered by velocities as
low as 4 km s^-1, well below the neutral acoustic speed. In the Earth's
ionosphere, the FBI occurs frequently in situations where the instability
trigger speed significantly exceeds the neutral acoustic speed. From this, we
expect neutral flows rising from the photosphere to have enough energy to
easily create electric fields and electron Hall drifts with sufficient
amplitude to make the FBI common in the chromosphere. If so, this process will
provide a mechanism to convert neutral flow and turbulence energy into electron
thermal energy in the quiet Sun.


title: Massive Clumps in Local Galaxies: Comparisons with High-Redshift Clumps

abstract:
  Local UV-bright galaxies in the Kiso survey include clumpy systems with
kpc-size star complexes that resemble clumpy young galaxies in surveys at high
redshift. We compare clump masses and underlying disks in several dozen
galaxies from each of these surveys to the star complexes and disks of normal
spirals. Photometry and spectroscopy for the Kiso and spiral sample come from
the Sloan Digital Sky Survey. We find that the largest Kiso clumpy galaxies
resemble UDF clumpies in terms of the star formation rates, clump masses, and
clump surface densities. Clump masses and surface densities in normal spirals
are smaller. If the clump masses are proportional to the turbulent Jeans mass
in the interstellar medium, then for the most luminous galaxies in the sequence
of normal:Kiso:UDF, the turbulent speeds and surface densities increase in the
proportions 1.0:4.7:5.0 and 1.0:4.0:5.1, respectively, for fixed restframe
B-band absolute magnitude. For the least luminous galaxies in the overlapping
magnitude range, the turbulent speed and surface density trends are 1.0:2.7:7.4
and 1.0:1.4:3.0, respectively. We also find that while all three types have
radially decreasing disk intensities when measured with ellipse-fit azimuthal
averages, the average profiles are more irregular for UDF clumpies (which are
viewed in their restframe UV) than for Kiso galaxies (viewed at g-band), and
major axis intensity scans are even more irregular for the UDF than Kiso
galaxies. Local clumpy galaxies in the Kiso survey appear to be intermediate
between UDF clumpies and normal spirals.


title:
The Lie Transform Method for perturbations of contravariant
  antisymmetric tensor fields and its applications to Hamiltonian dynamics

abstract:
  By means of the Schouten calculus for contravariant antisymmetric tensor
fields, we apply the Lie transform method to investigate smooth deformations of
tensor fields and, in particular, to perturbations of Hamiltonian systems
generated by deformations of the Poisson bracket. Using results by Karasev and
Vorobiev on the computation of Poisson cohomology we describe infinitesimal
generators for the Lie transformations. We give applications to perturbed Euler
equations on six dimensional Lie coalgebras and to Hamiltonian systems on
Poisson manifolds equipped with Dirac brackets.


title:
A multiscale modeling study for the convective mass transfer in a
  subsurface aquifer

abstract:
  Quantitative and realistic computer simulations of mass transfer associated
with CO2 disposal in subsurface aquifers is a challenging endeavor. This
article has proposed a novel and efficient multiscale modeling framework, and
has examined its potential to study the pen- etrative mass transfer in a CO2
plume that migrates in an aquifer. Nu- merical simulations indicate that the
migration of the injected CO2 enhances the vorticity generation, and the
dissolution of CO2 has a strong effect on the natural convection mass transfer.
The vorticity decays with the increase of the porosity. The time scale of the
vertical migration of a CO2 plume is strongly dependent on the rate of CO2
dissolution. Comparisons confirm the near optimal performance of the proposed
multiscale model. These primary results with an idealized computational model
of the CO2 migration in an aquifer brings the potential of the proposed
multiscale model to the field of heat and mass transfer in the geoscience.


title: Fast filtering and animation of large dynamic networks

abstract:
  Detecting and visualizing what are the most relevant changes in an evolving
network is an open challenge in several domains. We present a fast algorithm
that filters subsets of the strongest nodes and edges representing an evolving
weighted graph and visualize it by either creating a movie, or by streaming it
to an interactive network visualization tool. The algorithm is an approximation
of exponential sliding time-window that scales linearly with the number of
interactions. We compare the algorithm against rectangular and exponential
sliding time-window methods. Our network filtering algorithm: i) captures
persistent trends in the structure of dynamic weighted networks, ii) smoothens
transitions between the snapshots of dynamic network, and iii) uses limited
memory and processor time. The algorithm is publicly available as open-source
software.


title:
Intrinsic compound kernel estimates for the transition probability
  density of a L\'evy type processes and their applications

abstract:
  In this paper we construct the fundamental solution to some
integro-differential equation, as well as the intrinsic upper and lower
estimates for this solution. As an application of constructed estimates we
state a criterion when a given Borel measure belongs to the respective Kato and
Dynkin classes.


title: On the partition of R^n by hyperplanes

abstract:
  The partitioning of space by hyperplanes in the context of discrete
classification problem is considered. We obtain some relations for the number
of partitions and establish a recurrence relation for the maximal number of
partitions of R^n by m hyperplanes. We rederive an explicit formula for the
number of components into which the space can be partitioned by m hyperplanes.


title: de Finetti reductions for correlations

abstract:
  When analysing quantum information processing protocols one has to deal with
large entangled systems, each consisting of many subsystems. To make this
analysis feasible, it is often necessary to identify some additional structure.
de Finetti theorems provide such a structure for the case where certain
symmetries hold. More precisely, they relate states that are invariant under
permutations of subsystems to states in which the subsystems are independent of
each other. This relation plays an important role in various areas, e.g., in
quantum cryptography or state tomography, where permutation invariant systems
are ubiquitous. The known de Finetti theorems usually refer to the internal
quantum state of a system and depend on its dimension. Here we prove a
different de Finetti theorem where systems are modelled in terms of their
statistics under measurements. This is necessary for a large class of
applications widely considered today, such as device independent protocols,
where the underlying systems and the dimensions are unknown and the entire
analysis is based on the observed correlations.


title: Compressing measurements in quantum dynamic parameter estimation

abstract:
  We present methods that can provide an exponential savings in the resources
required to perform dynamic parameter estimation using quantum systems. The key
idea is to merge classical compressive sensing techniques with quantum control
methods to efficiently estimate time-dependent parameters in the system
Hamiltonian. We show that incoherent measurement bases and, more generally,
suitable random measurement matrices can be created by performing simple
control sequences on the quantum system. Since random measurement matrices
satisfying the restricted isometry property can be used to reconstruct any
sparse signal in an efficient manner, and many physical processes are
approximately sparse in some basis, these methods can potentially be useful in
a variety of applications such as quantum sensing and magnetometry. We
illustrate the theoretical results throughout the presentation with various
practically relevant numerical examples.


title:
Constraints on primordial magnetic fields from CMB distortions in the
  axiverse

abstract:
  Measuring spectral distortions of the cosmic microwave background (CMB) is
attracting considerable attention as a probe of high energy particle physics in
the cosmological context, since PIXIE and PRISM have recently been proposed. In
this paper, CMB distortions due to resonant conversions between CMB photons and
light axion like particles (ALPs) are investigated, motivated by the string
axiverse scenario which suggests the presence of a plenitude of light axion
particles. Since these resonant conversions depend on the strength of
primordial magnetic fields, constraints on CMB distortions can provide an upper
limit on the product of the photon-ALP coupling constant g and the comoving
strength of primordial magnetic fields B. Potentially feasible constraints from
PIXIE/PRISM can set a limit g B < 10^{-16} GeV^{-1} nG for ALP mass, m_\phi <
10^{-14} eV. Although this result is not a direct constraint on g and B, it is
significantly tighter than the product of the current upper limits on g and B.


title:
MAS for video objects segmentation and tracking based on active contours
  and SURF descriptor

abstract:
  In computer vision, video segmentation and tracking is an important
challenging issue. In this paper, we describe a new video sequences
segmentation and tracking algorithm based on MAS "multi-agent systems" and SURF
"Speeded Up Robust Features". Our approach consists in modelling a multi-agent
system for segmenting the first image from a video sequence and tracking
objects in the video sequences. The used agents are supervisor and explorator
agents, they are communicating between them and they inspire in their behavior
from active contours approaches. The tracking of objects is based on SURF
descriptors "Speed Up Robust Features". We used the DIMA platform and "API
Ateji PX" (an extension of the Java language to facilitate parallel programming
on heterogeneous architectures) to implement this algorithm. The experimental
results indicate that the proposed algorithm is more robust and faster than
previous approaches.


title: Projected entangled-pair states can describe chiral topological states

abstract:
  We show that Projected Entangled-Pair States (PEPS) in two spatial dimensions
can describe chiral topological states by explicitly constructing a family of
such states with a non-trivial Chern number. They are ground states of two
different kinds of free-fermion Hamiltonians: (i) local and gapless; (ii)
gapped, but with hopping amplitudes that decay according to a power law. We
derive general conditions on topological free fermionic PEPS which show that
they cannot correspond to exact ground states of gapped, local parent
Hamiltonians, and provide numerical evidence demonstrating that they can
nevertheless approximate well the physical properties of topological insulators
with local Hamiltonians at arbitrary temperatures.


title: Complexity in genetic networks: topology vs. strength of interactions

abstract:
  Genetic regulatory networks are defined by their topology and by a multitude
of continuously adjustable parameters. Here we present a class of simple models
within which the relative importance of topology vs. interaction strengths
becomes a well-posed problem. We find that complexity - the ability of the
network to adopt multiple stable states - is dominated by the adjustable
parameters. We comment on the implications for real networks and their
evolution.


title: Orientability of loop processes in relative locality

abstract:
  Inspired by recent results of unusual properties of loop processes in
relative locality, we introduce a way to classify loops in the case of
kappa-Poincare momentum space. We show that the notion of orientability is
deeply connected to a few essential properties of loop processes. Nonorientable
loops have "effective curvature", which explicitly breaks translation symmetry,
and can lead to a breaking of causality and global momentum conservation.
Orientable loops, on the other hand, are "flat." Causality and global momentum
conservation are all well preserved in this kind of loops. We comment that the
nontrivial classical loops in relative locality might be understood as dual
effects from general relativity, and some physical implications are discussed.


title: Cohomologie relative des formes cuspidales

abstract:
  In this note, we show that modular cusp forms have no higher direct images
between toroidal and minimal compactifiations. --- Dans cette note, nous
montrons que les faisceaux de formes modulaires cuspidales n'ont pas d'image
directe superieure entre compactifications toroidale et minimale.


title: Boosted di-boson from a mixed heavy stop

abstract:
  The lighter mass eigenstate ($\widetilde{t}_1$) of the two top squarks, the
scalar superpartners of the top quark, is extremely difficult to discover if it
is almost degenerate with the lightest neutralino ($\widetilde{\chi}_1^0$), the
lightest and stable supersymmetric particle in the R-parity conserving
supersymmetry. The current experimental bound on $\widetilde{t}_1$ mass in this
scenario stands only around 200 GeV. For such a light $\widetilde{t}_1$, the
heavier top squark ($\widetilde{t}_2$) can also be around the TeV scale.
Moreover, the high value of the higgs ($h$) mass prefers the left and right
handed top squarks to be highly mixed allowing the possibility of a
considerable branching ratio for $\widetilde{t}_2 \to \widetilde{t}_1 h$ and
$\widetilde{t}_2 \to \widetilde{t}_1 Z$. In this paper, we explore the above
possibility together with the pair production of $\widetilde{t}_2$
$\widetilde{t}_2^*$ giving rise to the spectacular di-boson + missing
transverse energy final state. For an approximately 1 TeV $\widetilde{t}_2$ and
a few hundred GeV $\widetilde{t}_1$ the final state particles can be moderately
boosted which encourages us to propose a novel search strategy employing the
jet substructure technique to tag the boosted $h$ and $Z$. The reconstruction
of the $h$ and $Z$ momenta also allows us to construct the stransverse mass
$M_{T2}$ providing an additional efficient handle to fight the backgrounds. We
show that a 4--5$\sigma$ signal can be observed at the 14 TeV LHC for $\sim$ 1
TeV $\widetilde{t}_2$ with 100 fb$^{-1}$ integrated luminosity.


title:
Realization of the Hofstadter Hamiltonian with ultracold atoms in
  optical lattices

abstract:
  We demonstrate the experimental implementation of an optical lattice that
allows for the generation of large homogeneous and tunable artificial magnetic
fields with ultracold atoms. Using laser-assisted tunneling in a tilted optical
potential we engineer spatially dependent complex tunneling amplitudes. Thereby
atoms hopping in the lattice accumulate a phase shift equivalent to the
Aharonov-Bohm phase of charged particles in a magnetic field. We determine the
local distribution of fluxes through the observation of cyclotron orbits of the
atoms on lattice plaquettes, showing that the system is described by the
Hofstadter model. Furthermore, we show that for two atomic spin states with
opposite magnetic moments, our system naturally realizes the time-reversal
symmetric Hamiltonian underlying the quantum spin Hall effect, i.e., two
different spin components experience opposite directions of the magnetic field.


title: Social Data Mining through Distributed Mobile Sensing

abstract:
  In this article, we present a distributed framework for collecting and
analyzing environmental and location data recorded by human users (carriers)
with the use of portable sensors. We demonstrate the data mining analysis
potential among the recorded environmental and location variables, as well as
the potential for classification analysis of human activities. We recognize
that the success of such an experimental framework relies on the adoption rate
by its candidate user network; thus, we have built our experimental prototype
on top of hardware equipment already embedded within the potential users'
everyday routine - i.e. hardware sensors installed on modern mobile phones.
Finally, we present preliminary analysis results on our collected data sample,
as well as potential further work directions and proposed use case scenarios.


title:
The Dimensional Reduction and K\"ahler Metric of Forms In Flux and
  Warping

abstract:
  We present a first-principles derivation of the K\"ahler metric for
axion-like moduli of conformally Calabi-Yau compactifications of IIB string
theory with imaginary self-dual 3-form flux at the classical level. We find
that the warp factor and flux modify the moduli space metric and therefore
K\"ahler potential even in classical supergravity, with the modifications
scaling as (volume)$^{-2/3}$ in the large-volume limit. Our derivation
emphasizes the role of constraints from 10D gauge symmetries and highlights
metric formality as a geometric property that protects the moduli space of
highly supersymmetric toroidal orientifolds. Our results have important
quantitative implications for nonperturbative moduli stabilization,
phenomenology, and cosmology in flux compactifications.


title:
Complete intersection theorem and complete nontrivial-intersection
  theorem for systems of set partitions

abstract:
  We prove the complete intersection theorem and complete
nontrivial-intersection theorem for systems of set partitions


title: Noether gauge symmetry for the Bianchi type I model in f(T) gravity

abstract:
  In this paper, we present the Noether symmetries of a class of the Bianchi
type I anisotropic model in the context of f(T) gravity. By solving the system
of equations obtained from the Noether symmetry condition, we obtain the form
of f(T) as a teleparallel form. This analysis shows that teleparallel gravity
has the maximum number of Noether symmetries. We derive the symmetry generators
and show that there are five kinds of symmetries, including time and scale
invariance under metric coefficients. We classify the symmetries and we obtain
the corresponding invariants.


title:
Ultra-Low Index and Rad-Hard Total Internal Reflection Claddings for
  High Numerical Aperture Scintillating, Waveshifting, Cerenkov, or Clear
  Optical Fibers, Capillaries, and Plates

abstract:
  Novel low index (n less than 1.3)/high light trapping cladding films
consisting of nanoporous alumina (sapphire), as formed by controlled
anodization of aluminum, are described. These films are mechanically hard,
intrinsically very rad-hard, and have an index of refraction n sufficiently
small to triple the light capture of waveshifting or scintillating fibers and
transparent plastic, glass or quartz core fibers. The low indices enable
light-piping of water Cerenkov light. Applications are in Energy, Intensity,
and Cosmic/Astroparticle detectors.


title:
Novel Compact Accelerator-Based Neutron and Gamma Sources for Future
  Detector Calibration

abstract:
  Novel ultra-compact, electrically switchable, time-structured/pulsed, ~1-14
MeV-level neutron and photon generators have application embedded into large
detector systems, especially calorimeters, for energy and operational
calibration. The small sizes are applicable to permanent in-situ deployment, or
able to be conveniently inserted into large high energy physics detector
systems. For bench- testing of prototypes, or for detector module production
testing, these compact n and gamma generators offer advantages.


title: Dwarf Galaxies with Optical Signatures of Active Massive Black Holes

abstract:
  We present a sample of 151 dwarf galaxies (10^8.5 < M_stellar < 10^9.5 Msun)
that exhibit optical spectroscopic signatures of accreting massive black holes
(BHs), increasing the number of known active galaxies in this stellar mass
range by more than an order of magnitude. Utilizing data from the Sloan Digital
Sky Survey Data Release 8 and stellar masses from the NASA-Sloan Atlas, we have
systematically searched for active BHs in ~25,000 emission-line galaxies with
stellar masses comparable to the Magellanic Clouds and redshifts z<0.055. Using
the narrow-line [OIII]/H-beta versus [NII]/H-alpha diagnostic diagram, we find
photoionization signatures of BH accretion in 136 galaxies, a small fraction of
which also exhibit broad H-alpha emission. For these broad-line AGN candidates,
we estimate BH masses using standard virial techniques and find a range of 10^5
< M_BH < 10^6 Msun and a median of M_BH ~ 2 x 10^5 Msun. We also detect broad
H-alpha in 15 galaxies that have narrow-line ratios consistent with
star-forming galaxies. Follow-up observations are required to determine if
these are true type 1 AGN or if the broad H-alpha is from stellar processes.
The median absolute magnitude of the host galaxies in our active sample is Mg =
-18.1 mag, which is ~1-2 magnitudes fainter than previous samples of AGN hosts
with low-mass BHs. This work constrains the smallest galaxies that can form a
massive BH, with implications for BH feedback in low-mass galaxies and the
origin of the first supermassive BH seeds.


title:
Conformal field theories in a periodic potential: results from
  holography and field theory

abstract:
  We study 2+1 dimensional conformal field theories (CFTs) with a globally
conserved U(1) charge, placed in a chemical potential which is periodically
modulated along the spatial direction $x$ with zero average: $\mu(x) = V
\cos(kx)$. The dynamics of such theories depends only on the dimensionless
ratio $V/k$, and we expect that they flow in the infrared to new CFTs whose
universality class changes as a function of $V/k$. We compute the
frequency-dependent conductivity of strongly-coupled CFTs using holography of
the Einstein-Maxwell theory in 4-dimensional anti-de Sitter space. We compare
the results with the corresponding computation of weakly-coupled CFTs,
perturbed away from the CFT of free, massless Dirac fermions (which describes
graphene at low energies). We find that the results of the two computations
have significant qualitative similarities. However, differences do appear in
the vicinities of an infinite discrete set of values of $V/k$: the universality
class of the infrared CFT changes at these values in the weakly-coupled theory,
by the emergence of new zero modes of Dirac fermions which are remnants of
local Fermi surfaces. The infrared theory changes continuously in holography,
and the classical gravitational theory does not capture the physics of the
discrete transition points between the infrared CFTs. We briefly note
implications for a non-zero average chemical potential.


title:
Unveiling the nature of the unidentified gamma-ray sources III:
  gamma-ray blazar-like counterparts at low radio frequencies

abstract:
  About one third of the gamma-ray sources listed in the second Fermi LAT
catalog (2FGL) have no firmly established counterpart at lower energies so
being classified as unidentified gamma-ray sources (UGSs). Here we propose a
new approach to find candidate counterparts for the UGSs based on the 325 MHz
radio survey performed with Westerbork Synthesis Radio Telescope (WSRT) in the
northern hemisphere. First we investigate the low-frequency radio properties of
blazars, the largest known population of gamma-ray sources; then we search for
sources with similar radio properties combining the information derived from
the Westerbork Northern Sky Survey (WENSS) with those of the NRAO VLA Sky
survey (NVSS). We present a list of candidate counterparts for 32 UGSs with at
least one counterpart in the WENSS. We also performed an extensive research in
literature to look for infrared and optical counterparts of the gamma-ray
blazar candidates selected with the low-frequency radio observations to confirm
their nature. On the basis of our multifrequency research we identify 23 new
gamma-ray blazar candidates out of 32 UGSs investigated. Comparison with
previous results on the UGSs are also presented. Finally, we speculate on the
advantages on the use of the low-frequency radio observations to associate UGSs
and to search for gamma-ray pulsar candidates.


title: On the power spectrum of inflationary cosmologies dual to a deformed CFT

abstract:
  We analyse slow-roll inflationary cosmologies that are holographically dual
to a three-dimensional conformal field theory deformed by a nearly marginal
scalar operator. We show the cosmological power spectrum is inversely
proportional to the spectral density associated with the 2-point function of
the trace of the stress tensor in the deformed CFT. Computing this quantity
using second-order conformal perturbation theory, we obtain a holographic power
spectrum in exact agreement with the expected inflationary power spectrum to
second order in slow roll.


title: Froggatt-Nielsen models with a residual Z_4^R symmetry

abstract:
  The Froggatt-Nielsen mechanism provides an elegant explanation for the
hierarchies of fermion masses and mixings in terms of a U(1) symmetry.
Promoting such a family symmetry to an R-symmetry, we explicitly construct
supersymmetric Froggatt-Nielsen models which are gauged, family dependent
U(1)_R completions of the Z_4^R symmetry proposed by Lee, Raby, Ratz, Ross,
Schieren, Schmidt-Hoberg and Vaudrevange in 2010. Forbidden by Z_4^R, the
mu-term is generated around the supersymmetry breaking scale m_3/2 from either
the Kahler potential or the superpotential. Neutrinos acquire their mass via
the type I seesaw mechanism with three right-handed neutrino superfields.
Taking into account the Green-Schwarz anomaly cancellation conditions, we
arrive at a total of 3 x 34 distinct phenomenologically viable charge
assignments for the standard model fields, most of which feature highly
fractional charges.


title:
Cosmological simulations of black hole growth: AGN luminosities and
  downsizing

abstract:
  In this study, we present a detailed, statistical analysis of black hole
growth and the evolution of active galactic nuclei (AGN) using cosmological
hydrodynamic simulations run down to $z=0$. The simulations self-consistently
follow radiative cooling, star formation, metal enrichment, black hole growth
and associated feedback processes from both supernovae typeII/Ia and AGN. We
consider two simulation runs, one with a large co-moving volume of $(500\
\mathrm{Mpc})^3$ and one with a smaller volume of $(68\ \mathrm{Mpc})^3$ but
with a by a factor of almost 20 higher mass resolution. Consistently with
previous results, our simulations can widely match observed black hole
properties of the local Universe. Furthermore, our simulations can successfully
reproduce the evolution of the bolometric AGN luminosity function for both the
low-luminosity and the high-luminosity end up to $z=3.0$. In addition, the
smaller but higher resolution run is able to match the observational data of
the low bolometric luminosity end at higher redshifts $z=3-4$. We also perform
a direct comparison with the observed soft and hard X-ray luminosity functions
of AGN, including an empirical correction for a torus-level obscuration, and
find a similarly good agreement. These results nicely demonstrate that the
observed "anti-hierarchical" trend in the AGN number density evolution (i.e.
the number densities of luminous AGN peak at higher redshifts than those of
faint AGN) is self-consistently predicted by our simulations. Implications of
this downsizing behaviour on active black holes, their masses and
Eddington-ratios are discussed. Overall, the downsizing behaviour in the AGN
number density as a function of redshift can be mainly attributed to the
evolution of the gas density in the resolved vicinity of a (massive) black
hole. (shortened)


title:
Reconciling 56Ni Production in Type Ia Supernovae with Double Degenerate
  Scenarios

abstract:
  Binary white dwarf (WD) coalescences driven by gravitational waves or
collisions in triple systems are potential progenitors of Type Ia supernovae
(SNe Ia). We combine the distribution of 56Ni inferred from observations of SNe
Ia with the results of both sub-Chandrasekhar detonation models and direct
collision calculations to estimate what mass WDs should be exploding in each
scenario to reproduce the observations. These WD mass distributions are then
compared with the observed Galactic WD mass distribution and Monte Carlo
simulations of WD-WD binary populations. For collisions, we find that the
average mass of the individual components of the WD-WD binary must be peaked at
~0.75Msun, significantly higher than the average WD mass in binaries or in the
field of ~0.55-0.60Msun. Thus, if collisions produce a large fraction of SNe
Ia, then a mechanism must exist that favors large mass WDs. On the other hand,
in an old stellar population, collisions would naturally result in a class of
low luminosity SNe Ia, and we suggest these may be related to 1991bg-like
events. For sub-Chandrasekhar detonations, we find that the average mass of the
exploding WDs must be peaked at ~1.1Msun. This is interestingly similar to the
average sum of the masses in WD-WD binaries, but it is not clear (and should be
further explored) whether double degenerate mergers would be sufficiently
efficient at synthesizing 56Ni to match the observed yields. If not, then
actual ~1.1Msun WDs would be needed for sub-Chandrasekhar detonations. Since
such high mass WDs are produced relatively quickly in comparison to the age of
the environments where SNe Ia are found, this would require either accretion
onto lower mass WDs prior to ignition or a long timescale between formation of
the ~1.1Msun WD and ignition (such as set by gravitational wave emission or
binary interactions).


title: Searching for Fermi Surfaces in Super-QED

abstract:
  The exploration of strongly-interacting finite-density states of matter has
been a major recent application of gauge-gravity duality. When the theories
involved have a known Lagrangian description, they are typically deformations
of large $N$ supersymmetric gauge theories, which are unusual from a
condensed-matter point of view. In order to better interpret the
strong-coupling results from holography, an understanding of the weak-coupling
behavior of such gauge theories would be useful for comparison. We take a first
step in this direction by studying several simple supersymmetric and
non-supersymmetric toy model gauge theories at zero temperature. Our
supersymmetric examples are $\mathcal{N}=1$ super-QED and $\mathcal{N}=2$
super-QED, with finite densities of electron number and R-charge respectively.
Despite the fact that fermionic fields couple to the chemical potentials we
introduce, the structure of the interaction terms is such that in both of the
supersymmetric cases the fermions do not develop a Fermi surface. One might
suspect that all of the charge in such theories would be stored in the scalar
condensates, but we show that this is not necessarily the case by giving an
example of a theory without a Fermi surface where the fermions still manage to
contribute to the charge density.


title:
The DiskMass Survey. VII. The distribution of luminous and dark matter
  in spiral galaxies

abstract:
  We present dynamically-determined rotation-curve mass decompositions of 30
spiral galaxies, which were carried out to test the maximum-disk hypothesis and
to quantify properties of their dark-matter (DM) halos. We used measured
vertical velocity dispersions of the disk stars to calculate dynamical mass
surface densities. Together with our atomic and molecular gas mass surface
densities, we derived the stellar mass surface densities, and thus have
absolute measurements of all dominant baryonic components. Using K-band surface
brightness profiles, we calculated the K-band mass-to-light ratio of the
stellar disks (M/L). Our result is consistent with all galaxies in the sample
having equal M/L, with a sample average and scatter of <M/L>=0.31+/-0.07.
Rotation-curves of the baryonic components were calculated from their mass
surface densities, and used with circular-speed measurements to derive the
structural parameters of the DM halos, modeled as either a pseudo-isothermal
sphere (pISO) or an NFW halo. All galaxies in our sample are submaximal, such
that at 2.2 disk scale lengths (hR) the ratios between the baryonic and total
rotation-curves (Fb^{2.2hR}) are less than 0.75. We find this ratio to be
nearly constant between 1-6 hR within individual galaxies. We find a sample
average and scatter of <Fb^{2.2hR}>=0.57+/-0.07, with trends of larger
Fb^{2.2hR} for more luminous and higher-surface-brightness galaxies. To enforce
these being maximal, we need to scale M/L by a factor 3.6 on average. The DM
rotation curves are marginally better fit by a pISO than by an NFW halo. For
the nominal-M/L (submaximal) case, the derived NFW-halo parameters have values
consistent with LCDM N-body simulations, suggesting that the baryonic matter
has only had a minor effect on the DM distribution. In contrast, maximum-M/L
decompositions yield halo concentrations that are too low compared to the LCDM
simulations.


title: ULTRACAM z'-band Detection of the Secondary Eclipse of WASP-12b

abstract:
  We present z'-band secondary eclipse photometry of the highly irradiated hot
Jupiter WASP-12b using ULTRACAM on the 4.2m William Herschel Telescope. We
measure a decrease in flux of \delta = 0.130+/-0.013% during the passage of the
planet behind the star, which is significantly deeper than the previous
measurement at this wavelength (0.082+/-0.015%, L\'opez-Morales et al. 2010).
Our secondary eclipse is best fit with a mid-eclipse phase, \phi, that is
compatible with a circular orbit \phi = 0.501+/-0.002, in agreement with
previous results (Croll et al. 2011). In combination with existing data, our
eclipse depth measurement allows us to constrain the characteristics of the
planet's atmosphere, which is consistent with a carbon-rich model, with no
evidence for a strong thermal inversion. If the difference in eclipse depth
reported here compared to that of L\'opez-Morales et al. (2010) is of physical
origin, as opposed to due to systematics, it may be caused by temporal
variability in the flux, due to atmospheric dynamics.


title: Asymmetric Dark Matter: Theories, Signatures, and Constraints

abstract:
  We review theories of Asymmetric Dark Matter (ADM), their cosmological
implications and detection. While there are many models of ADM in the
literature, our review of existing models will center on highlighting the few
common features and important mechanisms for generation and transfer of the
matter-anti-matter asymmetry between dark and visible sectors. We also survey
ADM hidden sectors, the calculation of the relic abundance for ADM, and how the
DM asymmetry may be erased at late times through oscillations. We consider
cosmological constraints on ADM from the cosmic microwave background, neutron
stars, the Sun, and brown and white dwarves. Lastly, we review indirect and
direct detection methods for ADM, collider signatures, and constraints.


title:
Giant Molecular Cloud Formation in Disk Galaxies: Characterizing
  Simulated versus Observed Cloud Catalogues

abstract:
  We present the results of a study of simulated Giant Molecular Clouds (GMCs)
formed in a Milky Way-type galactic disk with a flat rotation curve. This
simulation, which does not include star formation or feedback, produces clouds
with masses ranging between 10^4 Msun and 10^7 Msun. We compare our simulated
cloud population to two observational surveys; The Boston University- Five
College Radio Astronomy Observatory Galactic Ring Survey and the BIMA All-Disk
Survey of M33. An analysis of the global cloud properties as well as a
comparison of Larson's scaling relations is carried out. We find that simulated
cloud properties agree well with the observed cloud properties, with the
closest agreement occurring between the clouds at comparable resolution in M33.
Our clouds are highly filamentary - a property that derives both from their
formation due to gravitational instability in the sheared galactic environment,
as well as to cloud- cloud gravitational encounters. We also find that the rate
at which potentially star forming gas accumulates within dense regions -
wherein n_{thresh} > 10^4 cm^{-3} - is 3% per 10 Myr, in clouds of roughly 10^6
Msun. This suggests that star formation rates in observed clouds are related to
the rates at which gas can be accumulated into dense subregions within GMCs via
filamentary flows. The most internally well-resolved clouds are chosen for
listing in a catalogue of simulated GMCs; the first of its kind. The catalogued
clouds are available as an extracted data set from the global simulation.


title:
Implications of Plasma Beam Instabilities for the Statistics of the
  Fermi Hard Gamma-ray Blazars and the Origin of the Extragalactic Gamma-Ray
  Background

abstract:
  Fermi has been instrumental in constraining the luminosity function and
redshift evolution of gamma-ray bright blazars. This includes limits upon the
spectrum and anisotropy of the extragalactic gamma-ray background (EGRB),
redshift distribution of nearby Fermi active galactic nuclei (AGN), and the
construction of a log(N)-log(S) relation. Based upon these, it has been argued
that the evolution of the gamma-ray bright blazar population must be much less
dramatic than that of other AGN. However, critical to such claims is the
assumption that inverse Compton cascades reprocess emission above a TeV into
the Fermi energy range, substantially enhancing the strength of the observed
limits. Here we demonstrate that in the absence of such a process, due, e.g.,
to the presence of virulent plasma beam instabilities that preempt the cascade,
a population of TeV-bright blazars that evolve similarly to quasars is
consistent with the population of hard gamma-ray blazars observed by Fermi.
Specifically, we show that a simple model for the properties and luminosity
function is simultaneously able to reproduce their log(N)-log(S) relation,
local redshift distribution, and contribution to the EGRB and its anisotropy
without any free parameters. Insofar the naturalness of a picture in which the
hard gamma-ray blazar population exhibits the strong redshift evolution
observed in other tracers of the cosmological history of accretion onto halos
is desirable, this lends support for the absence of the inverse Compton
cascades and the existence of the beam plasma instabilities.


title: Spin 1/2 quasinormal mode frequencies in Schwarzschild-AdS spacetime

abstract:
  We find the asymptotic formula for quasinormal mode frequencies omega_n of
the Dirac equation in a Schwarzschild-AdS_D background in space-time dimension
D > 3, in the large black-hole limit appropriate to many applications of the
AdS/CFT correspondence. By asymptotic, we mean large overtone number n with
everything else held fixed, and we find the O(n^0) correction to the known
leading O(n) behavior of omega_n. The result has the schematic form omega_n =~
n Delta(omega) + A ln(n) + B, where Delta(omega) and A are constants and B
depends logarithmically on the (D-2)-dimensional spatial momentum k parallel to
the horizon. We show that the asymptotic result agrees well with exact
quasinormal mode frequencies computed numerically.


title:
Marangoni convection in an evaporating droplet: Analytical and numerical
  descriptions

abstract:
  The stationary single vortex Marangoni convection in an axially symmetrical
sessile drop of capillary size is considered. The detailed description of the
fluid flows is presented for a wide range of contact angles, which takes into
account the boundary conditions and the mass balance equation, without
explicitly solving the Navier--Stokes equations. The analytical approach
developed is compared with the results of numerical simulations and
demonstrated to describe reasonably well the single-vortex Marangoni flows.
This indicates the substantial role of the boundary conditions in the problem.


title: Topological Flat Band Models and Fractional Chern Insulators

abstract:
  Topological insulators and their intriguing edge states can be understood in
a single-particle picture and can as such be exhaustively classified.
Interactions significantly complicate this picture and can lead to entirely new
insulating phases, with an altogether much richer and less explored
phenomenology. Most saliently, lattice generalizations of fractional quantum
Hall states, dubbed fractional Chern insulators, have recently been predicted
to be stabilized by interactions within nearly dispersionless bands with
non-zero Chern number, $C$. Contrary to their continuum analogues, these states
do not require an external magnetic field and may potentially persist even at
room temperature, which make these systems very attractive for possible
applications such as topological quantum computation. This review recapitulates
the basics of tight-binding models hosting nearly flat bands with non-trivial
topology, $C\neq 0$, and summarizes the present understanding of interactions
and strongly correlated phases within these bands. Emphasis is made on
microscopic models, highlighting the analogy with continuum Landau level
physics, as well as qualitatively new, lattice specific, aspects including
Berry curvature fluctuations, competing instabilities as well as novel
collective states of matter emerging in bands with $|C|>1$. Possible
experimental realizations, including oxide interfaces and cold atom
implementations as well as generalizations to flat bands characterized by other
topological invariants are also discussed.


abstract:
  We show that Abelian discrete symmetries Z_{N} and Z_{nR} from string
orbifolds result by assigning vacuum expectation values(VEVs) only to specified
singlets. These singlets obtaining VEVs carry the gauge charges (of the
covering U(1) gauge group) as multiples of N for Z_N and n for Z_{nR}. We
explicitly show this realization in a Z_{12-I} orbifold model.


title:
An Optimal Control Approach to the Multi-Agent Persistent Monitoring
  Problem in Two-Dimensional Spaces

abstract:
  We address the persistent monitoring problem in two-dimensional mission
spaces where the objective is to control the trajectories of multiple
cooperating agents to minimize an uncertainty metric. In a one-dimensional
mission space, we have shown that the optimal solution is for each agent to
move at maximal speed and switch direction at specific points, possibly waiting
some time at each such point before switching. In a two-dimensional mission
space, such simple solutions can no longer be derived. An alternative is to
optimally assign each agent a linear trajectory, motivated by the
one-dimensional analysis. We prove, however, that elliptical trajectories
outperform linear ones. With this motivation, we formulate a parametric
optimization problem in which we seek to determine such trajectories. We show
that the problem can be solved using Infinitesimal Perturbation Analysis (IPA)
to obtain performance gradients on line and obtain a complete and scalable
solution. Since the solutions obtained are generally locally optimal, we
incorporate a stochastic comparison algorithm for deriving globally optimal
elliptical trajectories. Numerical examples are included to illustrate the main
result, allow for uncertainties modeled as stochastic processes, and compare
our proposed scalable approach to trajectories obtained through off-line
computationally intensive solutions.


title: Distribution-Free Tests for Sparse Heterogeneous Mixtures

abstract:
  We consider the problem of detecting sparse heterogeneous mixtures from a
nonparametric perspective, and develop distribution-free tests when all effects
have the same sign. Specifically, we assume that the null distribution is
symmetric about zero, while the true effects have positive median. We evaluate
the precise performance of classical tests for the median (t-test, sign test)
and classical tests for symmetry (signed-rank, Smirnov, total number of runs,
longest run tests) showing that none of them is asymptotically optimal for the
normal mixture model in all sparsity regimes. We then suggest two new tests.
The main one is a form of Higher Criticism, or Anderson-Darling, test for
symmetry. It is shown to be asymptotically optimal for the normal mixture
model, and other generalized Gaussian mixture models, in all sparsity regimes.
Our numerical experiments confirm our theoretical findings.


title:
Field Theory of the d+t -> n+alpha Reaction Dominated by a 5He* Unstable
  Particle

abstract:
  An effective, non-relativistic field theory for low-energy d+t -> n+alpha
reaction is presented. The theory assumes that the reaction is dominated by an
intermediate 5He* unstable spin 3/2+ resonance. It involves two parameters in
the coupling of the d+t and n+alpha particles to the unstable resonant state,
and the resonance energy level -- only three real parameters in all. All
Coulomb corrections to this process are computed. The resultant field theory is
exactly solvable and provides an excellent description of the d+t fusion
process.


title:
Effective field theory as a limit of R-matrix theory for light nuclear
  reactions

abstract:
  We study the zero channel radius limit of Wigner's R-matrix theory for two
cases, and show that it corresponds to non-relativistic effective quantum field
theory. We begin with the simple problem of single-channel n-p elastic
scattering in the 1S0 channel. The dependence of the R matrix width and level
energy on the channel radius, "a" for fixed scattering length a0 and effective
range r0 is determined. It is shown that these quantities have a simple pole
for a critical value of the channel radius. The 3H(d,n)4He reaction cross
section, analyzed with a two-channel effective field theory in the previous
paper, is then examined using a two-channel, single-level R-matrix
parametrization. The resulting S matrix is shown to be identical in these two
representations in the limit that R-matrix channel radii are taken to zero.
This equivalence is established by giving the relationship between the
low-energy constants of the effective field theory (couplings and mass) and the
R-matrix parameters (reduced width amplitudes and level energy). An excellent
three-parameter fit to the observed astrophysical factor S is found for
"unphysical" values of the reduced widths.


title:
Topological States in Ferromagnetic CdO/EuO Superlattices and Quantum
  Wells

abstract:
  Based on ab initio calculations, we demonstrate that the ferromagnetic
CdO/EuO superlattice is a simple Weyl semimetal with two linear Weyl nodes in
the Brillouin zone, and the corresponding CdO/EuO quantum well realizes the
stichometric quantum anomalous Hall state without random magnetic doping. In
addition, a simple effective model is presented to describe the basic mechanism
of spin polarized band inversion in this system.


title: Simulation of the dynamics in the magnetotail current sheet

abstract:
  The dynamics in the magnetosphere current sheet was simulated following
transformations to the rectangular NxM array of cells (cellular automaton)
originally proposed by Koselov and Koselova (2002). The magnetosphere part of
the modeling system was organized as a rectangular arrangement of cells with a
stored energy, a local redistribution of the energy will exist when a value
threshold is exceeded in one of the cells. We assume that the threshold value
in each cell depends on external control parameter which influences the long
boundaries of the rectangular array (40x80). The model dynamics controlled by
the z-component of the interplanetary magnetic field (Bz) as well as analogies
between the model transient processes and the observed substorm auroral
activations are discussed. The Bz correspond to temporary windows of the solar
wind for a group of magnetic clouds and plasmoids. The model simulates
organized patterns in the energy distribution. The function of distribution of
probability (or PDF) of the size of the avalanches have a power-law form,
showing evidences of a system with Self-Organized Criticality (SOC). The
occurrence of big avalanches in the model is related with the activation of
some intense magnetic substorm. The arrival to the terrestrial magnetopause of
a solar wind with Bz negative is a fundamental condition of occurrence of
magnetic substorms. While more negative it is the Bz IMF component bigger it is
the value of the AE index and trigger a strong magnetic substorm.


title:
Target Selection for the Apache Point Observatory Galactic Evolution
  Experiment (APOGEE)

abstract:
  The Apache Point Observatory Galactic Evolution Experiment (APOGEE) is a
high-resolution infrared spectroscopic survey spanning all Galactic
environments (i.e., bulge, disk, and halo), with the principal goal of
constraining dynamical and chemical evolution models of the Milky Way. APOGEE
takes advantage of the reduced effects of extinction at infrared wavelengths to
observe the inner Galaxy and bulge at an unprecedented level of detail. The
survey's broad spatial and wavelength coverage enables users of APOGEE data to
address numerous Galactic structure and stellar populations issues. In this
paper we describe the APOGEE targeting scheme and document its various target
classes to provide the necessary background and reference information to
analyze samples of APOGEE data with awareness of the imposed selection criteria
and resulting sample properties. APOGEE's primary sample consists of ~100,000
red giant stars, selected to minimize observational biases in age and
metallicity. We present the methodology and considerations that drive the
selection of this sample and evaluate the accuracy, efficiency, and caveats of
the selection and sampling algorithms. We also describe additional target
classes that contribute to the APOGEE sample, including numerous ancillary
science programs, and we outline the targeting data that will be included in
the public data releases.


title: Spin Relaxation due to Charge Noise

abstract:
  We study decoherence of an electron spin qubit in a quantum dot due to charge
noise. We find that at the lowest order, the pure dephasing channel is
suppressed for both $1/f$ charge noise and Johnson noise, so that charge noise
leads to a pure relaxation channel of decoherence. Because of the weaker
magnetic field dependence, the spin relaxation rate due to charge noise could
dominate over phonon noise at low magnetic fields in a gate-defined GaAs or Si
quantum dot or a InAs self-assembled quantum dot. Furthermore, in a large InAs
self-assembled quantum dot, the spin relaxation rate due to phonon noise could
be suppressed in high magnetic field, and the spin relaxation due to charge
noise could dominate in both low and high magnetic field. Numerically, in a 1
Tesla field, the spin relaxation time due to typical charge noise is about
$100$ s in Si, $0.1$ s in GaAs for a gate-defined quantum dot with a $1$ meV
confinement, and $10$ $\mu$s in InAs self-assembled quantum dot with a $4$ meV
confinement.


title: Relic Abundance of Asymmetric Dark Matter in Quintessence

abstract:
  We investigate the relic abundance of asymmetric Dark Matter particles in
quintessence model with a kination phase. The analytic calculation of the
asymmetric Dark Matter in the standard cosmological scenario is extended to the
nonstandard cosmological scenario where we specifically discuss the
quintessence model with a kination phase. We found that the enhancement of
Hubble rate changes the relic density of particles and anti--particles. We use
the present day Dark Matter abundance to constrain the Hubble rate in
quintessence model with a kination phase for asymmetric Dark Matter.


title:
Discovery of Multiple, Ionization-Created Anions in Gas Mixtures
  Containing CS2 and O2

abstract:
  The use of negative ions in TPCs has several advantages for high-resolution
rare- event detection experiments. The DRIFT experiment, for example, has taken
full advantage of this technique over the past decade in a directional search
for dark matter. This paper focuses on the surprising discovery of multiple
species of ionization-created CS2 anions, called minority carriers, in gas
mixtures containing electronegative CS2 and O2, identified by their slightly
different drift velocities. Measurements of minority carriers in gas mixtures
of CS2, CF4 and O2 are reported in an effort to understand the nature of these
charge carriers. Regardless of the micro-physics however, this discovery offers
significant practical advantages for experiments such as DRIFT, where the
difference in arrival time may be used to fiducialize the original ionization
event without an external start pulse.


title:
Probing Supersymmetric Dark Matter and the Electroweak Sector using
  Vector Boson Fusion Processes: A Snowmass Whitepaper

abstract:
  Vector boson fusion (VBF) processes at the Large Hadron Collider (LHC)
provide a unique opportunity to search for new physics with electroweak
couplings. Two studies are presented: (i) A search of supersymmetric dark
matter in the final state of two VBF jets and large missing transverse energy
is presented at 14 TeV. Prospects for determining the dark matter relic density
are studied for the cases of Wino and Bino-Higgsino dark matter. The LHC could
probe Wino dark matter with mass up to approximately 600 GeV with a luminosity
of 1000 fb$^{-1}$. (ii) A search for the chargino/neutralino system in the
final state of two VBF jets, missing transverse energy and two $\tau$'s (light
stau case) and light lepton $e$ and $\mu$ (light slepton case). The $5 \sigma$
mass reach at 300 fb$^{-1}$ (1000 fb$^{-1}$) of LHC14 for inclusive and
opposite-sign $\tau$ pairs are 250 GeV (300 GeV) and 200 GeV (250 GeV),
respectively, for $\Delta M \, = \, m_{\tilde{\tau}_1} - m_{\neu{1}} \, = \,
30$ GeV. For $\Delta M \, = \, 15$ GeV, the $3 \sigma$ mass reach at 300
fb$^{-1}$ (1000 fb$^{-1}$) of LHC14 for inclusive $\tau$ pairs is 180 GeV. The
$5 \sigma$ mass reach at 300 fb$^{-1}$ (1000 fb$^{-1}$) of LHC14 for inclusive
and opposite-sign $\mu$ pairs are approximately 350 GeV (400 GeV) and 300 GeV
(350 GeV), respectively. The mass reaches in the same-sign final state cases
are similar to those in the opposite-sign cases.


title:
Design and Development of an Expert System to Help Head of University
  Departments

abstract:
  One of the basic tasks which is responded for head of each university
department, is employing lecturers based on some default factors such as
experience, evidences, qualifies and etc. In this respect, to help the heads,
some automatic systems have been proposed until now using machine learning
methods, decision support systems (DSS) and etc. According to advantages and
disadvantages of the previous methods, a full automatic system is designed in
this paper using expert systems. The proposed system is included two main
steps. In the first one, the human expert's knowledge is designed as decision
trees. The second step is included an expert system which is evaluated using
extracted rules of these decision trees. Also, to improve the quality of the
proposed system, a majority voting algorithm is proposed as post processing
step to choose the best lecturer which satisfied more expert's decision trees
for each course. The results are shown that the designed system average
accuracy is 78.88. Low computational complexity, simplicity to program and are
some of other advantages of the proposed system.


title:
Exploring the Variable Sky with LINEAR. III. Classification of Periodic
  Light Curves

abstract:
  We describe the construction of a highly reliable sample of approximately
7,000 optically faint periodic variable stars with light curves obtained by the
asteroid survey LINEAR across 10,000 sq.deg of northern sky. Majority of these
variables have not been cataloged yet. The sample flux limit is several
magnitudes fainter than for most other wide-angle surveys; the photometric
errors range from ~0.03 mag at $r=15$ to ~0.20 mag at r=18. Light curves
include on average 250 data points, collected over about a decade. Using
SDSS-based photometric recalibration of the LINEAR data for about 25 million
objects, we selected ~200,000 most probable candidate variables and visually
confirmed and classified approximately 7,000 periodic variables using phased
light curves. The reliability and uniformity of visual classification across
eight human classifiers was calibrated and tested using a SDSS Stripe 82 region
variable star catalog, and verified using an unsupervised machine learning
approach. The resulting sample of periodic LINEAR variables is dominated by
3,900 RR Lyrae stars and 2,700 eclipsing binary stars of all subtypes, and
includes small fractions of relatively rare populations such as asymptotic
giant branch stars and SX Phoenicis stars. We discuss the distribution of these
mostly uncataloged variables in various diagrams constructed with
optical-to-infrared SDSS, 2MASS and WISE photometry, and with LINEAR light
curve features. An interesting side result is a robust and precise quantitative
description of a strong correlation between the light-curve period and
color/spectral type for close and contact eclipsing binary stars. These large
samples of robustly classified variable stars will enable detailed statistical
studies of the Galactic structure and physics of binary and other stars, and we
make them publicly available.


title:
PSR J2021+4026 in the Gamma Cygni region: the first variable gamma-ray
  pulsar seen by the Fermi LAT

abstract:
  Long-term monitoring of PSR J2021+4026 in the heart of the Cygnus region with
the Fermi Large Area Telescope (LAT) unveiled a sudden decrease in flux above
100 MeV over a time scale shorter than a week. The "jump" was near MJD 55850
(2011 October 16), with the flux decreasing from $(8.33\pm0.08) \times
10^{-10}$ erg cm$^{-2}$ s$^{-1}$ to $(6.86\pm0.13) \times 10^{-10}$ erg
cm$^{-2}$ s$^{-1}$. Simultaneously, the frequency spindown rate increased from
$(7.8\pm 0.1) \times 10^{-13}$ Hz s$^{-1}$ to $(8.1\pm 0.1) \times 10^{-13}$ Hz
s$^{-1}$. Significant (> 5 sigma's) changes in the pulse profile and marginal
(< 3 sigma's) changes in the emission spectrum occurred at the same time. There
is also evidence for a small, steady flux increase over the three years
preceding MJD 55850. This is the first observation at gamma-ray energies of
mode changes and intermittent behavior, observed at radio wavelengths for other
pulsars. We argue that the change in pulsed gamma-ray emission is due to a
change in emission beaming and we speculate that it is precipitated by a shift
in the magnetic field structure, leading to a change of either effective
magnetic inclination or effective current.


title:
Airtight metallic sealing at room temperature under small mechanical
  pressure

abstract:
  Here, we report a process of metallic sealing using small well-separated Ag
nanorods; the process is at room temperature under a small mechanical pressure
of 9.0 MPa, and also in ambient. The metallic seals have an air leak rate of
1.1 x 10-3 cm3atm/m2/day, and mechanical shear strength higher than 8.9 MPa.
This leak rate meets the requirement of organic solar cells and organic light
emitting diodes [1].


title:
A comparison of the carrier density at the surface of quantum wells for
  different crystal orientations of silicon, gallium arsenide and indium
  arsenide

abstract:
  We report the carrier densities at the surface of single-crystal quantum
wells as a function of material, orientation and well width. We include wells
constructed from silicon, gallium arsenide and indium arsenide with three
crystal orientations, (100), (110) and (111), included for each material. We
find that the D2 states in a silicon (100) quantum well have the smallest
density near the surface of the slab. Inspection of the planar average of the
carrier densities reveals a characteristic shape that depends on the material
and orientation, which leads to a varying degree of suppression or enhancement
of the density near the surface. The physics responsible for the suppression or
enhancement of the density near the surface can be traced to a constraint
imposed by the symmetry of quantum well wavefunction on the phases of the bulk
Bloch states of the crystal from which it can be constructed.


title: Order, criticality and excitations in the extended Falicov-Kimball model

abstract:
  Using exact numerical techniques we investigate the nature of excitonic
(electron-hole) bound states and the development of exciton coherence in the
one-dimensional half-filled extended Falicov-Kimball model. The ground-state
phase diagram of the model exhibits, besides band insulator and staggered
orbital ordered phases, an excitonic insulator (EI) with power-law
correlations. The criticality of the EI state shows up in the von Neumann
entropy. The anomalous spectral function and condensation amplitude provide the
binding energy and coherence length of the electron-hole pairs which, on their
part, point towards a Coulomb interaction driven crossover from BCS-like
electron-hole pairing fluctuations to tightly bound excitons. We show that
while a mass imbalance between electrons and holes does not affect the location
of the BCS-BEC crossover regime it favors staggered orbital ordering to the
disadvantage of the EI. Within the BEC regime the quasiparticle dispersion
develops a flat valence-band top in accord with the experimental finding for
Ta$_2$NiSe$_5$.


title: Circular, elliptic and oval billiards in a gravitational field

abstract:
  We consider classical dynamical properties of a particle in a constant
gravitational force and making specular reflections with circular, elliptic or
oval boundaries. The model and collision map are described and a detailed study
of the energy regimes is made. The linear stability of fixed points is studied,
yielding exact analytical expressions for parameter values at which a
period-doubling bifurcation occurs. The dynamics is apparently ergodic at
certain energies in all three models, in contrast to the regularity of the
circular and elliptic billiard dynamics in the field-free case. This finding is
confirmed using a sensitive test involving Lyapunov weighted dynamics. In the
last part of the paper a time dependence is introduced in the billiard
boundary, where it is shown that for the circular billiard the average velocity
saturates for zero gravitational force but in the presence of gravitational it
increases with a very slow growth rate, which may be explained using Arnold
diffusion. For the oval billiard, where chaos is present in the static case,
the particle has an unlimited velocity growth with an exponent of approximately
1/6.


title: Electronic and optical properties of GaSb:N from first principles

abstract:
  GaSb:N displays promise towards realization of optoelectronic devices
accessing the mid-infrared wavelength regime. Theoretical and experimental
results on its electronic and optical properties are however few. To address
this, we present a first principles, density functional theory study using the
hybrid HSE06 exchange-correlation functional of GaSb doped with 1.6$\%$
nitrogen. To study dilute-nitrides with small band gaps, the local density
approximation (LDA) is insufficient and more accurate techniques such as HSE06
are needed. We conduct a comparative study on GaAs:N, also with 1.6$\%$
nitrogen mole fraction, and find that GaSb:N has a smaller band gap and
displays more band gap bowing than GaAs:N. In addition we examine the orbital
character of the bands, finding the lowest conduction band to be
quasi-delocalized, with a large N-$3s$ contribution. At high concentrations,
the N atoms interact via the host matrix, forming a dispersive band of their
own which governs optoelectronic properties and dominates band gap bowing.
While this band drives the optical and electronic properties of GaSb:N, its
physics is not captured by traditional models for dilute-nitrides. We thus
propose that a complete theory of dilute-nitrides should incorporate orbital
character examination, especially at high N concentrations.


title: FFLO state with angle dependent Gap in Asymmetric Nuclear Matter

abstract:
  We consider the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state with an angle
dependent-gap (ADG) for the arbitrary angle \theta_0 between the direction of
the Cooper pair momentum and the symmetry axis of the ADG in asymmetric nuclear
matter. We find two kinds of locally stable states, i.e., the
FFLO-ADG-orthogonal and FFLO-ADG-parallel states, which correspond to
\theta_0=\pi/2 and \theta_0=0, respectively. Furthermore,
the-FFLO-ADG-orthogonal state is located at small asymmetry, whereas the
FFLO-ADG-parallel state is favored for large asymmetry. The critical isospin
asymmetry \alpha_c, where the superfluid vanishes, is enhanced largely by
considering the Cooper pair momentum with an ADG.


title: Hybrid Focal Stereo Networks for Pattern Analysis in Homogeneous Scenes

abstract:
  In this paper we address the problem of multiple camera calibration in the
presence of a homogeneous scene, and without the possibility of employing
calibration object based methods. The proposed solution exploits salient
features present in a larger field of view, but instead of employing active
vision we replace the cameras with stereo rigs featuring a long focal analysis
camera, as well as a short focal registration camera. Thus, we are able to
propose an accurate solution which does not require intrinsic variation models
as in the case of zooming cameras. Moreover, the availability of the two views
simultaneously in each rig allows for pose re-estimation between rigs as often
as necessary. The algorithm has been successfully validated in an indoor
setting, as well as on a difficult scene featuring a highly dense pilgrim crowd
in Makkah.


title:
Biomimetic method for metallic nanostructured mesoscopic models
  fabrication

abstract:
  Various metallic structures of complex shape, resembling natural objects such
as plants, mushrooms, and seashells, were produced when growing nanowires by
means of pulsed current electroplating in porous membranes. These structures
occur as the result of nanowires self-assembling (biomimetics) if the
electroplating is continued after the nanowires reach the membrane surface. By
varying the membrane geometry and the pulsed current parameters, and
alternating electroplating from two baths with different electrolytes, various
models were fabricated, including a hollow container with wall thickness of
10-30 nm. The possibility of shape regulation for models was demonstrated: in
certain conditions, mushroom- and shell-like convex-concave models of the same
kind were obtained. The hierarchical structure of models at the nano-, micro-
and mesoscopic levels is shown through fragmentation and chemical etching.


title:
Monitor backscatter factors for the Varian 21EX and TrueBeam linear
  accelerators: measurements and Monte Carlo modeling

abstract:
  Purpose/Objective: Backscattered radiation (BSR) into linac monitor chamber
has to be accounted for in radiotherapy dose calculations. In Monte Carlo (MC)
calculations, the BSR can be modeled explicitly, but only when treatment head
geometry is available. In this study, monitor backscatter factors (MBSFs),
defined as the ratio of the charge collected in the monitor chamber for a
reference field to that of a given field, have been evaluated experimentally
and incorporated into MC modelling of linacs with either known or unknown
treatment head geometry.
  Materials and methods: A telescopic technique similar to that by Kubo (1989)
was used. However, instead of lead slits, a 1.8 mm diameter collimator and a
small (2 mm diameter) detector positioned at extended SDD were used. This setup
provided a field of view to the source of less than 3.1 mm and allowed for MBSF
measurements of open fields from 1 x 1 to 40 x 40 cm2. MBSFs were also
explicitly modeled in MC calculations using BEAMnrc and DOSXYZnrc codes for 6MV
and 18MV beams of a Varian 21EX linac. A method for deriving the Dchforward
values that are used in MC absolute dose calculations was demonstrated. These
values were derived from measured MBSFs for two 21EX and four TrueBeam
energies.
  Results: MBSFs were measured for 6MV and 18MV beams from Varian 21EX, and for
6MV, 10MV-FFF, 10MV, and 15MV beams from Varian TrueBeam linacs. For the open
field sizes modeled in this study for the 21EX, the measured MBSFs agreed with
MC calculated values within combined statistical (0.4%) and experimental (0.2%)
uncertainties. Variation of MBSFs across field sizes was about a factor of two
smaller for the TrueBeam compared to 21EX Varian linacs.
  Conclusions: Measured MBSFs and the derived Dchforward factors allow for the
incorporation of the BSR effect into accurate radiotherapy dose calculations
without explicit backscatter modelling.


title: A Twisted Quantum Toroidal Algebra

abstract:
  As an analog of the quantum TKK algebra, a twisted quantum toroidal algebra
of type A_1 is introduced. Explicit realization of the new quantum TKK algebra
is constructed with the help of twisted quantum vertex operators over a Fock
space.


title: KIC 9406652: An Unusual Cataclysmic Variable in the Kepler Field of View

abstract:
  KIC 9406652 is a remarkable variable star in the Kepler field of view that
shows both very rapid oscillations and long term outbursts in its light curve.
We present an analysis of the light curve over quarters 1 to 15 and new
spectroscopy that indicates that the object is a cataclysmic variable with an
orbital period of 6.108 hours. However, an even stronger signal appears in the
light curve periodogram for a shorter period of 5.753 hours, and we argue that
this corresponds to the modulation of flux from the hot spot region in a
tilted, precessing disk surrounding the white dwarf star. We present a
preliminary orbital solution from radial velocity measurements of features from
the accretion disk and the photosphere of the companion. We use a Doppler
tomography algorithm to reconstruct the disk and companion spectra, and we also
consider how these components contribute to the object's spectral energy
distribution from ultraviolet to infrared wavelengths. This target offers us a
remarkable opportunity to investigate disk processes during the high mass
transfer stage of evolution in cataclysmic variables.


title: Integrable lattice models from four-dimensional field theories

abstract:
  This note gives a general construction of an integrable lattice model (and a
solution of the Yang-Baxter equation with spectral parameter) from a
four-dimensional field theory which is a mixture of topological and
holomorphic. Spin-chain models arise in this way from a twisted, deformed
version of N=1 gauge theory.


title: Sparse arrays of signatures for online character recognition

abstract:
  In mathematics the signature of a path is a collection of iterated integrals,
commonly used for solving differential equations. We show that the path
signature, used as a set of features for consumption by a convolutional neural
network (CNN), improves the accuracy of online character recognition---that is
the task of reading characters represented as a collection of paths. Using
datasets of letters, numbers, Assamese and Chinese characters, we show that the
first, second, and even the third iterated integrals contain useful information
for consumption by a CNN.
  On the CASIA-OLHWDB1.1 3755 Chinese character dataset, our approach gave a
test error of 3.58%, compared with 5.61% for a traditional CNN [Ciresan et
al.]. A CNN trained on the CASIA-OLHWDB1.0-1.2 datasets won the ICDAR2013
Online Isolated Chinese Character recognition competition.
  Computationally, we have developed a sparse CNN implementation that make it
practical to train CNNs with many layers of max-pooling. Extending the MNIST
dataset by translations, our sparse CNN gets a test error of 0.31%.


title: An Intelligent Fire Alert System using Wireless Mobile Communication

abstract:
  The system has come to light through the way of inspiration to develop a
compact system, based on the fundamental ideas of safety, security and control.
Once this system is installed to operation specifying temperature and smoke
threshold, in case of any emergency situation due to increasing temperature
and/or smoke at place surpassing the threshold, the system immediately sends
automatic alert-notifications to the users, concerned with the situations. The
user gets total control over the system through mobile SMS, even from the
distant location, that to change the threshold, turn on/off the feature of
sending 'alert notification' and also to reset the system after the emergency
situation is overcome. Before executing any command (through SMS) from the
user, the system asks for the preset password to verify an authorized user. The
security issues have been considered with utter attention in this system to
ensure its applicability in industries and business organizations, where
security is an important concern. Hence, the fundamental ideas of safety,
security and control have been entirely ensured through the system, which have
definitely worked as the gear moving factor to look for a new dimension of an
'Intelligent Fire Alert System'.


title: How to test SME with space missions ?

abstract:
  In this communication, we focus on possibilities to constrain SME
coefficients using Cassini and Messenger data. We present simulations of
radioscience observables within the framework of the SME, identify the linear
combinations of SME coefficients the observations depend on and determine the
sensitivity of these measurements to the SME coefficients. We show that these
datasets are very powerful for constraining SME coefficients.