title:
Genetical adaptation of common kilka Clupeonella cultriventris
  (Nordmann, 1840) (Actinopterygii: Clupeidae)

abstract:
  It is the first time, when genetic diversity and the common kilka population
structure were investigated throughout the areal. Data about the species
condition at the Upper Volga basins were updated accordingly to modern
condition. Physiological and ecological adaptations to northern water basins
were evaluated. Significance of interaction between some loci and the most
important abiotic environmental factors at the selection was demonstrated. The
results suggest that the common kilka Clupeonella cultriventris (Nordmann,
1840) is presented by uniform set of population throughout the areal. The
successive expansion of the species through the cascade of the Volga's water
reservoirs can be explained by complex of genetic and biochemical adaptation
for sweet water habitat. It was supposed that the sweet water populations
originated from Saratov's backwaters sweet water population. Seasonal
fluctuations of abiotic and biotic environmental factors have significant
influence on genotype distribution at the newly formed population. This book is
intended for use by ichthyologists, ecologists, environmental protection and
management of natural resources specialists. In Russian.


title:
Elliptic Dichroism in Angular Distributions in Free-Free Transitions in
  Hydrogen

abstract:
  We discuss here the effect of the photon helicity in laser induced and
inverse bremstrahlung for {\it high energy scattering} of electrons by hydrogen
atoms. We demonstrate that it is possible to find EDAD for high scattering
energies of the electrons if the{\it \ dressing of the atomic target} by the
laser field is taken into account. We consider higher optical frequencies of
the laser field and we restrict ourselves to the use of moderate field
intensities.


title: Simple metastable de Sitter vacua in N=2 gauged supergravity

abstract:
  We construct a simple class of N=2 gauged supergravity theories that admit
metastable de Sitter vacua, generalizing the recent work done in the context of
rigid supersymmetry. The setup involves one hypermultiplet and one vector
multiplet spanning suitably curved quaternionic-Kahler and special-Kahler
geometries, with an Abelian gauging based on a single triholomorphic isometry,
but neither Fayet-Iliopoulos terms nor non-Abelian gauge symmetries. We
construct the most general model of this type and show that in such a situation
the possibility of achieving metastable supersymmetry breaking vacua crucially
depends on the value of the cosmological constant V relative to the gravitino
mass squared m_{3/2}^2 in Planck units. In particular, focusing on de Sitter
vacua with positive V, we show that metastability is only possible when V >=
2.17 m_{3/2}^2. We also derive an upper bound on the lightest scalar mass in
this kind of model relative to the gravitino mass m_{3/2} as a function of the
cosmological constant V, and discuss its physical implications.


title:
Instantaneous filling of the vacuum for the full Boltzmann equation in
  convex domains

abstract:
  We prove the immediate appearance of a lower bound for mild solutions to the
full Boltzmann equation in the torus or a $C^2$ convex domain with specular
boundary conditions, under the sole assumption of continuity away from the
grazing set of the solution. These results are entirely constructive if the
domain is $C^3$ and strictly convex. We investigate a wide range of collision
kernels, some satisfying Grad's cutoff assumption and others not. We show that
this lower bound is exponential, independent of time and space with explicit
constants depending only on the \textit{a priori} bounds on the solution. In
particular, this lower bound is Maxwellian in the case of cutoff collision
kernels. A thorough study of characteristic trajectories, as well as a
geometric approach of grazing collisions against the boundary are derived.


title:
Efficient time synchronized one-time password scheme to provide secure
  wake-up authentication on wireless sensor networks

abstract:
  In this paper we propose Time Synchronized One-Time-Password scheme to
provide secure wake up authentication. The main constraint of wireless sensor
networks is their limited power resource that prevents us from using radio
transmission over the network to transfer the passwords. On the other hand
computation power consumption is insignificant when compared to the costs
associated with the power needed for transmitting the right set of keys. In
addition to prevent adversaries from reading and following the timeline of the
network, we propose to encrypt the tokens using symmetric encryption to prevent
replay attacks.


title:
Radiative seesaw-type mechanism of quark masses in SU(3\)_{C}\otimes
  SU(3\)_{L}\otimes U\(1\)_{X}$

abstract:
  We take up again the study of the mass spectrum of the quark sector in a
model with gauge symmetry $SU(3)_{c}\otimes SU(3)_{L}\otimes U(1)_{X}$ (331).
In a special type II-like 331 model, we obtain specific zero-texture mass
matrices for the quarks which predict four massless quarks ($u,c,d,s$) and two
massive quarks ($b,t$) at the electroweak scale ($\sim $ GeV). By considering
the mixing between the SM quarks and new exotic quarks at large scales
predicted by the model, we find that a third quark (associated to the charm
quark) acquires a mass. The remaining light quarks ($u,d,s$) get small masses
($\sim$ MeV) via radiative corrections.


title:
Failure of Delayed Feedback Deep Brain Stimulation for Intermittent
  Pathological Synchronization in Parkinson's Disease

abstract:
  Suppression of excessively synchronous beta-band oscillatory activity in the
brain is believed to suppress hypokinetic motor symptoms of Parkinson's
disease. Recently, a lot of interest has been devoted to desynchronizing
delayed feedback deep brain stimulation (DBS). This type of synchrony control
was shown to destabilize the synchronized state in networks of simple model
oscillators as well as in networks of coupled model neurons. However, the
dynamics of the neural activity in Parkinson's disease exhibits complex
intermittent synchronous patterns, far from the idealized synchronous dynamics
used to study the delayed feedback stimulation. This study explores the action
of delayed feedback stimulation on partially synchronized oscillatory dynamics,
similar to what one observes experimentally in parkinsonian patients. We employ
a model of the basal ganglia networks which reproduces experimentally observed
fine temporal structure of the synchronous dynamics. When the parameters of our
model are such that the synchrony is unphysiologically strong, the feedback
exerts a desynchronizing action. However, when the network is tuned to
reproduce the highly variable temporal patterns observed experimentally, the
same kind of delayed feedback may actually increase the synchrony. As network
parameters are changed from the range which produces complete synchrony to
those favoring less synchronous dynamics, desynchronizing delayed feedback may
gradually turn into synchronizing stimulation. This suggests that delayed
feedback DBS in Parkinson's disease may boost rather than suppress
synchronization and is unlikely to be clinically successful. The study also
indicates that delayed feedback stimulation may not necessarily exhibit a
desynchronization effect when acting on a physiologically realistic partially
synchronous dynamics, and provides an example of how to estimate the
stimulation effect.


title:
A Numerical Slow Manifold Approach to Model Reduction for Optimal
  Control of Multiple Time Scale ODE

abstract:
  Time scale separation is a natural property of many control systems that can
be ex- ploited, theoretically and numerically. We present a numerical scheme to
solve optimal control problems with considerable time scale separation that is
based on a model reduction approach that does not need the system to be
explicitly stated in singularly perturbed form. We present examples that
highlight the advantages and disadvantages of the method.


title: Galaxy rotation curves in $f(R,\phi)$-gravity

abstract:
  We investigate the possibility to explain theoretically the galaxy rotation
curves by a gravitational potential in total absence of dark matter. To this
aim an analytic fourth-order theory of gravity, nonminimally coupled with a
massive scalar field is considered. Specifically, the interaction term is given
by an analytic function $f(R,\phi)$ where $R$ is the Ricci scalar and $\phi$ is
the scalar field. The gravitational potential is generated by a point-like
source and compared with the so called Sanders's potential that can be exactly
reproduced in this case. This result means that the problem of dark matter in
spiral galaxies could be fully addressed by revising general relativity at
galactic scales and requiring further gravitational degrees of freedom instead
of new material components that have not been found out up to now.


title:
Discovery of Fe K-alpha X-ray reverberation around the black holes in
  MCG-5-23-16 and NGC 7314

abstract:
  Several X-ray observations have recently revealed the presence of
reverberation time delays between spectral components in AGN. Most of the
observed lags are between the power-law Comptonization component, seen
directly, and the soft excess produced by reflection in the vicinity of the
black hole. NGC 4151 was the first object to show these lags in the iron K
band. Here, we report the discovery of reverberation lags in the Fe K band in
two other sources: MCG-5-23-16 and NGC 7314. In both objects, the 6-7 keV band,
where the Fe K line peaks, lags the bands at lower and higher energies with a
time delay of ~ 1 kilo-seconds. These lags are unlikely to be due to the narrow
Fe K line. They are fully consistent with reverberation of the
relativistically-broadened iron K line. The measured lags, their time-scale and
spectral modeling, indicate that most of the radiation is emitted at ~ 5 and 24
gravitational radii for MCG-5-23-16 and NGC 7314 respectively.


title: AdS spacetimes and isometric embeddings

abstract:
  An algebraic global isometric embedding of the nonrotating BTZ black hole is
presented. The ambient spacetime is $\mathbb{M}^{2,3}$, the 3+2 dimensional
flat spacetime. We also present the analogous embedding for the Euclidean BTZ
spacetime and by performing a kind of double analytic continuation construct a
1-parameter family of embeddings of cosmological AdS spacetime into
$\mathbb{M}^{2,3}$ which coincide asymptotically with the embedded BTZ manifold
of the appropriate mass. Finally we note that the family of embeddings of
cosmological AdS$_{n}$ into $\mathbb{M}^{2,n}$ generalises to higher
dimensions.


title: Trees and spatial topology change in CDT

abstract:
  Generalized causal dynamical triangulations (generalized CDT) is a model of
two-dimensional quantum gravity in which a limited number of spatial topology
changes is allowed to occur. We solve the model at the discretized level using
bijections between quadrangulations and trees. In the continuum limit (scaling
limit) the amplitudes are shown to agree with known formulas and explicit
expressions are obtained for loop propagators and two-point functions. It is
shown that from a combinatorial point of view generalized CDT can be viewed as
the scaling limit of planar maps with a finite number of faces and we determine
the distance function on this ensemble of planar maps. Finally, the relation
with planar maps is used to illuminate a mysterious identity of certain
continuum cylinder amplitudes.


title:
Searches for Higgs bosons in pp collisions at sqrt(s) = 7 and 8 TeV in
  the context of four-generation and fermiophobic models

abstract:
  Searches are reported for Higgs bosons in the context of either the standard
model extended to include a fourth generation of fermions (SM4) with masses of
up to 600 GeV or fermiophobic models. For the former, results from three decay
modes (tau tau, WW, and ZZ) are combined, whilst for the latter the diphoton
decay is exploited. The analysed proton-proton collision data correspond to
integrated luminosities of up to 5.1 inverse femtobarns at 7 TeV and up to 5.3
inverse femtobarns at 8 TeV. The observed results exclude the SM4 Higgs boson
in the mass range 110-600 GeV at 99% confidence level (CL), and in the mass
range 110-560 GeV at 99.9% CL. A fermiophobic Higgs boson is excluded in the
mass range 110-147 GeV at 95% CL, and in the range 110-133 GeV at 99% CL. The
recently observed boson with a mass near 125 GeV is not consistent with either
an SM4 or a fermiophobic Higgs boson.


title: Dynamics of a Bose-Einstein Condensate of Excited Magnons

abstract:
  The emergence of a non-equilibrium Bose-Einstein-like condensation of magnons
in rf-pumped magnetic thin films has recently been experimentally observed. We
present here a complete theoretical description of the non-equilibrium
processes involved. It it demonstrated that the phenomenon is another example
of the presence of a Bose-Einstein-like condensation in non-equilibrium
many-boson systems embedded in a thermal bath, better referred-to as
Fr\"{o}hlich-Bose-Einstein condensation. The complex behavior emerges after a
threshold of the exciting intensity is attained. It is inhibited at higher
intensities when the magnon-magnon interaction drives the magnons to internal
thermalization. The observed behavior of the relaxation to equilibrium after
the end of the pumping pulse is also accounted for and the different processes
fully described.


title: Saturation effects in exclusive rhoT, rhoL meson electroproduction

abstract:
  We use recent results for the gamma*L -> rhoL and gamma*T -> rhoT impact
factors, computed in the impact parameter representation within the collinear
factorization scheme, to get predictions for the polarized cross-sections
sigmaT and sigmaL of the diffractive leptoproduction of the rho meson at high
energy. In this approach the helicity amplitude is a convolution of the
scattering amplitude of a color dipole with a target, together with the virtual
gamma wave function and with the first moments of the rho meson wave function
(in the transverse momentum space), given by the distribution amplitudes up to
twist 3 for the gamma*T -> rhoT impact factor and up to twist 2 for the gamma*L
-> rhoL impact factor. Combining these results with recent dipole models fitted
to DIS data, which include saturation effects, we show that the predictions are
in good agreement with HERA data for photon virtuality (Q**2) larger than
typically 5 GeV**2, without free parameters and with a weak dependence on the
choice of the factorization scale, i.e. the shape of the DAs, for both
longitudinally and transversely polarized rho meson. For lower values of Q**2,
the inclusion of saturation effects is not enough to provide a good description
of HERA data. We believe that it is a signal of a need for higher twist
contributions in the rho meson DAs. We also analyze the radial distributions of
dipoles between the initial gamma* and the final rho meson states.


title:
Symmetry breaking and restoring wave transmission in diode-antidiode
  double chains

abstract:
  We introduce a system of two parallel-coupled discrete nonlinear Schroedinger
(DNLS) inhomogeneous chains. Each one favors the unidirectional transmission of
incident packets, in the opposite directions with respect to each other. Two
different configurations of the diode-antidiode pair are considered, a ladder
and a plaquette. They feature, respectively, the uniform transverse linear
coupling, or the coupling limited to the central nonlinear segment of the
system. In the case of weak linear coupling, the symmetry breaking is observed
(i.e., the pair still features the diode behavior), while the moderately strong
coupling restores the symmetry, making the transmission effectively
bidirectional. In the case of the ladder, an oscillatory dependence of the
transmission on the strength of the coupling is observed and qualitatively
explained.


title:
Vorticity moments in four numerical simulations of the 3D Navier-Stokes
  equations

abstract:
  The issue of intermittency in numerical solutions of the 3D Navier-Stokes
equations on a periodic box $[0,\,L]^{3}$ is addressed through four sets of
numerical simulations that calculate a new set of variables defined by
$D_{m}(t) = \left(\varpi_{0}^{-1}\Omega_{m}\right)^{\alpha_{m}}$ for $1 \leq m
\leq \infty$ where $\alpha_{m}= \frac{2m}{4m-3}$ and
$\left[\Omega_{m}(t)\right]^{2m} = L^{-3}\I |\bom|^{2m}dV$ with $\varpi_{0} =
\nu L^{-2}$. All four simulations unexpectedly show that the $D_{m}$ are
ordered for $m = 1\,,...,\,9$ such that $D_{m+1} < D_{m}$. Moreover, the
$D_{m}$ squeeze together such that $D_{m+1}/D_{m}\nearrow 1$ as $m$ increases.
The first simulation is of very anisotropic decaying turbulence\,; the second
and third are of decaying isotropic turbulence from random initial conditions
and forced isotropic turbulence at constant Grashof number respectively\,; the
fourth is of very high Reynolds number forced, stationary, isotropic turbulence
at up to resolutions of $4096^{3}$.


title:
Examples of polynomial identities distinguishing the Galois objects over
  finite-dimensional Hopf algebras

abstract:
  We define polynomial H-identities for comodule algebras over a Hopf algebra H
and establish general properties for the corresponding T-ideals. In the case H
is a Taft algebra or the Hopf algebra E(n), we exhibit a finite set of
polynomial H-identities which distinguish the Galois objects over H up to
isomorphism.


title: The meson-exchange model for the $\Lambda\bar{\Lambda}$ interaction

abstract:
  In the present work, we apply the one-boson-exchange potential (OBEP) model
to investigate the possibility of Y(2175) and $\eta(2225)$ as bound states of
$\Lambda\bar{\Lambda}(^3S_1)$ and $\Lambda\bar{\Lambda}(^1S_0)$ respectively.
We consider the effective potential from the pseudoscalar $\eta$-exchange and
$\eta^{'}$-exchange, the scalar $\sigma$-exchange, and the vector
$\omega$-exchange and $\phi$-exchange. The $\eta$ and $\eta^{'}$ meson exchange
potential is repulsive force for the state $^1S_0$ and attractive for $^3S_1$.
The results depend very sensitively on the cutoff parameter of the
$\omega$-exchange ($\Lambda_{\omega}$) and least sensitively on that of the
$\phi$-exchange ($\Lambda_{\phi}$). Our result suggests the possible
interpretation of Y(2175) and $\eta(2225)$ as the bound states of
$\Lambda\bar{\Lambda}(^3S_1)$ and $\Lambda\bar{\Lambda}(^1S_0)$ respectively.


title:
Why is so hard to grow a perfect crystal? - 2D and 3D Monte Carlo
  simulations

abstract:
  We focus our attention on Monte Carlo simulations of crystallization, which
is one of the most important processes occurring in nature and technology of
materials. Special attention is paid to the crystallization shrinkage and its
consequences onto the growth of the new crystalline phase. We show that
crystallization shrinkage stops after reaching the percolation threshold and
that this is not the final stage of the crystallization process. Based on
experimental evidences on sintering of diopside-albite systems and computer
simulations we argue that crystallization continues inside the grains where the
remaining liquid melt is a subject of accumulation of stress and because the
stress relaxation by change in the volume is forbidden due to the already
formed rigid core, the so called crystallization induced porosity appears. We
show that even a relatively simple short range potential as the Lennard-Jones
one, reveals such a complicated phenomenon as the crystallization induced
porosity, which has a great importance onto the mechanical properties of the
newly crystallized material.


title: An ANN-based Method for Detecting Vocal Fold Pathology

abstract:
  There are different algorithms for vocal fold pathology diagnosis. These
algorithms usually have three stages which are Feature Extraction, Feature
Reduction and Classification. While the third stage implies a choice of a
variety of machine learning methods, the first and second stages play a
critical role in performance and accuracy of the classification system. In this
paper we present initial study of feature extraction and feature reduction in
the task of vocal fold pathology diagnosis. A new type of feature vector, based
on wavelet packet decomposition and Mel-Frequency-Cepstral-Coefficients
(MFCCs), is proposed. Also Principal Component Analysis (PCA) is used for
feature reduction. An Artificial Neural Network is used as a classifier for
evaluating the performance of our proposed method.


title: Single Top Physics at Hadron Colliders

abstract:
  The production of top quark in electroweak processes was first observed in
2010 at the Tevatron. Since then it has been carefully studied at both LHC and
Tevatron. Single top production proceeds through different channels and allows
a direct determination of Cabibbo-Kobayashi-Maskawa matrix element $|V_{tb}|$.
We will present the current status of searches and observation and discuss the
results obtained so far and perspectives at hadron machines.


title:
Releasing scalar fields: cosmological simulations of scalar-tensor
  theories for gravity beyond the static approximation

abstract:
  Several extensions of General Relativity and high energy physics include
scalar fields as extra degrees of freedom. In the search for predictions in the
non-linear regime of cosmological evolution, the community makes use of
numerical simulations in which the quasi-static limit is assumed when solving
the equation of motion of the scalar field. In this Letter, we propose a method
to solve the full equations of motion for scalar degrees of freedom coupled to
matter. We run cosmological simulations which track the full time and space
evolution of the scalar field, and find striking differences with respect to
the commonly used quasi-static approximation. This novel procedure reveals new
physical properties of the scalar field and uncovers concealed astrophysical
phenomena which were hidden in the old approach.


title: Ion acceleration by superintense laser-plasma interaction

abstract:
  Ion acceleration driven by superintense laser pulses is attracting an
impressive and steadily increasing effort. Motivations can be found in the
potential for a number of foreseen applications and in the perspective to
investigate novel regimes as far as available laser intensities will be
increasing. Experiments have demonstrated in a wide range of laser and target
parameters the generation of multi-MeV proton and ion beams with unique
properties such as ultrashort duration, high brilliance and low emittance. In
this paper we give an overview of the state-of-the art of ion acceleration by
laser pulses as well as an outlook on its future development and perspectives.
We describe the main features observed in the experiments, the observed scaling
with laser and plasma parameters and the main models used both to interpret
experimental data and to suggest new research directions.


title: Highly stable piezoelectrically tunable optical cavities

abstract:
  We have implemented highly stable and tunable frequency references using
optical high finesse cavities which incorporate a piezo actuator. As piezo
material we used ceramic PZT, crystalline quartz, or PZN-PT single crystals.
Lasers locked to these cavities show a relative frequency stability better than
1 x 10^{-14}, which is most likely not limited by the piezo actuators. The
piezo cavities can be electrically tuned over more than one free spectral range
(> 1.5 GHz) with only a minor decrease in frequency stability. Furthermore, we
present a novel cavity design, where the piezo actuator is prestressed between
the cavity spacer components. This design features a hermetically sealable
intra cavity volume suitable for, e.g., cavity enhanced spectroscopy.


title: Wideband Spectrum Sensing for Cognitive Radio Networks: A Survey

abstract:
  Cognitive radio has emerged as one of the most promising candidate solutions
to improve spectrum utilization in next generation cellular networks. A crucial
requirement for future cognitive radio networks is wideband spectrum sensing:
secondary users reliably detect spectral opportunities across a wide frequency
range. In this article, various wideband spectrum sensing algorithms are
presented, together with a discussion of the pros and cons of each algorithm
and the challenging issues. Special attention is paid to the use of sub-Nyquist
techniques, including compressive sensing and multi-channel sub-Nyquist
sampling techniques.


title:
Interaction between collisionless galactic discs and nonaxissymmetric
  dark matter haloes

abstract:
  Using $N$-body simulations ($N\sim 10^6 - 10^7$), we examine how a
non-axisymmetric dark halo affects the dynamical evolution of the structure in
collisionless (stellar) discs. We demonstrate how the model parameters such as
mass of the halo, initial conditions in the disc and the halo axes ratio affect
morphology and kinematics of the stellar discs. We show that a non-axisymmetric
halo can generate a large-scale spiral density pattern in the embedded stellar
disc. The pattern is observed in the disc for many periods of its revolution,
even if the disc is gravitationally over-stable. The growth of the spiral arms
is not accompanied by significant dynamical heating of the disc, irrelevant to
its initial parameters. We also investigate transformation of the dark halo's
shape driven by the long-lived spiral pattern in the disc . We show that the
analysis of the velocity field in the stellar disc and in the spiral pattern
gives us a possibility to figure out the spatial orientation of the
triaxial-shaped dark halo and to measure the triaxiality.


title:
A Higgs mass at 125 GeV calculated from neutron to proton decay in a
  u(3) Lie group Hamiltonian framework

abstract:
  We investigate the neutron to proton decay via a Higgs mechanism in the
framework of a reinterpreted Kogut-Susskind Hamiltonian on the Lie group u(3).
We calculate expressions for a scalar Higgs mass, an electroweak energy scale,
and vector gauge boson masses which all compare well with observed or derived
values. Our sole ad hoc inputs to the calculations are the classical electron
radius and the weak mixing angle. Our result for the Higgs mass relative to the
electron mass involves only mathematical constants and the fine structure
constant. It yields 125.1 GeV for a fine structure constant taken as a
geometric mean between it's sliding scale values at respectively the electron
mass and the W vector boson mass which are both involved in the neutron decay.
In passing we compare with the neutral flavour baryon spectrum and mention an
approximate calculation of the relative neutron to proton mass ratio of 0.13847
percent which is promisingly close to the observed value of 0.137842 percent.
We finally mention the Fermi coupling constant as a derived quantity.


title:
Comment on "Vortices induced in a superconducting loop by asymmetric
  kinetic inductance and their detection in transport measurements"

abstract:
  The paper by G. R. Berdiyorov, M. V. Milosevic, and F. M. Peeters [Phys. Rev.
B 81, 144511 (2010)] studies theoretically the dynamic properties of a
superconducting loop. The authors claim that their consideration of asymmetric
loop relates to our experimental results in this field. We point out that this
claim is incorrect and explain shortly the true paradoxical essence of the
results of our measurements of asymmetric superconducting loop.


title: Self-Energy of the Lorentzian EPRL-FK Spin Foam Model of Quantum Gravity

abstract:
  We calculate the most divergent contribution to the non-degenerate sector of
the self-energy (or "melonic") graph in the context of the Lorentzian EPRL-FK
Spin Foam model of Quantum Gravity. We find that such a contribution is
logarithmically divergent in the cut-off over the SU(2)-representation spins
when one chooses the face amplitude guaranteeing the face-splitting invariance
of the foam.We also find that the dependence on the boundary data is different
from that of the bare propagator. This fact has its origin in the
non-commutativity of the EPRL-FK Y-map with the projector onto
SL(2,C)-invariant states. In the course of the paper, we discuss in detail the
approximations used during the calculations, its geometrical interpretation as
well as the physical consequences of our result.


title: Model structures from a monad on presheaves

abstract:
  In this note we describe conditions under which the algebras for a monad on a
presheaf category equipped with some additional structure are fibrant objects
in a model structure. We also prove that when these conditions are satisfied
the resulting model structure is, in a suitable sense, the smallest model
structure for which the units of the monad give a fibrant replacement.


title:
Quantum Channel Negativity as a Measure of System-Bath Coupling and
  Correlation

abstract:
  Complete positivity is a ubiquitous assumption in the study of quantum
systems interacting with the environment, but the lack of complete positivity
of a quantum evolution (called the "negativity") can be used as a measure of
the system-bath coupling and correlation. The negativity can be computed from
the Choi representation of a channel, is always defined and bounded, and can be
used to understand environmentally induced noise in a quantum system.


title:
Thermoelectromotive force of hafnium at plastic deformation in regime of
  creep at temperature of 300 K

abstract:
  The thermoelectromotive force and electrical resistivity of the
polycrystalline hafnium (Hf) with the grain size of 10 {\mu}m during the
process of plastic deformation in the regime of creep at the temperature of 300
K are precisely measured. It is shown that the thermoelectromotive force
depends on the deformation mechanism nature, because of the changing magnitude
of the electrons scattering on the different structural defects in the hafnium
crystal lattice at the deformation process. The main research conclusion is
that the method of thermoelectromotive force measurements is more informative,
comparing to the method of electric resistivity measurements in the process of
accurate characterization of the hafnium.


title:
Lone Pair Effect, Structural Distortions and Potential for
  Superconductivity in Tl Perovskites

abstract:
  Drawing the analogy to BaBiO3, we investigate via ab-initio electronic
structure calculations potential new superconductors of the type ATlX3 with A =
Rb, Cs and X = F, Cl, and Br, with a particular emphasis on RbTlCl3. Based on
chemical reasoning, supported by the calculations, we show that Tl-based
perovskites have structural and charge instabilities driven by the lone pair
effect, similar to the case of BaBiO3, effectively becoming A2Tl1+Tl3+X6. We
find that upon hole doping of RbTlCl3, structures without Tl1+, Tl3+ charge
disproportionation become more stable, although the ideal cubic perovskite,
often viewed as the best host for superconductivity, should not be the most
stable phase in the system. The known superconductor (Sr,K)BiO3 and hole doped
RbTlCl3, predicted to be most stable in the same tetragonal structure, display
highly analogous calculated electronic band structures.


title: A Widder's type Theorem for the heat equation with nonlocal diffusion

abstract:
  The main goal of this work is to prove that every non-negative {\it strong
solution} $u(x,t)$ to the problem $$
  u_t+(-\Delta)^{\alpha/2}u=0 \ \quad\mbox{for }
  (x,t)\in\mathbb{R}^{n}\times(0,T), \quad 0<\alpha<2, $$
  can be written as $$u(x,t)=\int_{\mathbb{R}^{n}}{P_{t}(x-y)u(y,0)\, dy},$$
where $$P_{t}(x)=\frac{1}{t^{n/\alpha}}P\left(\frac{x}{t^{1/\alpha}}\right), $$
and $$ P(x):=\int_{\mathbb{R}^{n}}{e^{ix\cdot\xi-|\xi|^{\alpha}}d\xi}. $$ This
result shows uniqueness in the setting of non-negative solutions and extends
some classical results for the heat equation by D. V. Widder in \cite{W0} to
the nonlocal diffusion framework.


title:
Calculating Separate Magnetic Free Energy Estimates for Active Regions
  Producing Multiple Flares: NOAA AR11158

abstract:
  It is well known that photospheric flux emergence is an important process for
stressing coronal fields and storing magnetic free energy, which may then be
released during a flare. The \emph{Helioseismic and Magnetic Imager} (HMI)
onboard the \emph{Solar Dynamics Observatory} (SDO) captured the entire
emergence of NOAA AR 11158. This region emerged as two distinct bipoles,
possibly connected underneath the photosphere, yet characterized by different
photospheric field evolutions and fluxes. The combined active region complex
produced 15 GOES C--class, 2 M--class, and the X2.2 Valentine's Day Flare
during the four days after initial emergence on February 12th, 2011. The M and
X class flares are of particular interest because they are nonhomologous,
involving different subregions of the active region. We use a Magnetic Charge
Topology together with the Minimum Current Corona model of the coronal field to
model field evolution of the complex. Combining this with observations of flare
ribbons in the 1600\AA\ channel of the \emph{Atmospheric Imaging Assembly}
(AIA) onboard SDO, we propose a minimization algorithm for estimating the
amount of reconnected flux and resulting drop in magnetic free energy during a
flare. For the M6.6, M2.2, and X2.2 flares, we find a flux exchange of
$4.2\times 10^{20}\unit{Mx},\ 2.0 \times 10^{20}\unit{Mx}, \hbox{and} 21.0
\times 10^{20}\unit{Mx}$, respectively, resulting in free energy drops of
$3.89\times 10^{30}\unit{ergs}, 2.62\times 10^{30}\unit{ergs}, \hbox{and}
1.68\times 10^{32}\unit{ergs}$.


title:
High order three part split symplectic integrators: Efficient techniques
  for the long time simulation of the disordered discrete nonlinear
  Schroedinger equation

abstract:
  While symplectic integration methods based on operator splitting are well
established in many branches of science, high order methods for Hamiltonian
systems that split in more than two parts have not been studied in great
detail. Here, we present several high order symplectic integrators for
Hamiltonian systems that can be split in exactly three integrable parts. We
apply these techniques, as a practical case, for the integration of the
disordered, discrete nonlinear Schroedinger equation (DDNLS) and compare their
efficiencies. Three part split algorithms provide effective means to
numerically study the asymptotic behavior of wave packet spreading in the DDNLS
- a hotly debated subject in current scientific literature.


title: Lensless Compressive Sensing Imaging

abstract:
  In this paper, we propose a lensless compressive sensing imaging
architecture. The architecture consists of two components, an aperture assembly
and a sensor. No lens is used. The aperture assembly consists of a two
dimensional array of aperture elements. The transmittance of each aperture
element is independently controllable. The sensor is a single detection
element, such as a single photo-conductive cell. Each aperture element together
with the sensor defines a cone of a bundle of rays, and the cones of the
aperture assembly define the pixels of an image. Each pixel value of an image
is the integration of the bundle of rays in a cone. The sensor is used for
taking compressive measurements. Each measurement is the integration of rays in
the cones modulated by the transmittance of the aperture elements. A
compressive sensing matrix is implemented by adjusting the transmittance of the
individual aperture elements according to the values of the sensing matrix. The
proposed architecture is simple and reliable because no lens is used.
Furthermore, the sharpness of an image from our device is only limited by the
resolution of the aperture assembly, but not affected by blurring due to
defocus. The architecture can be used for capturing images of visible lights,
and other spectra such as infrared, or millimeter waves. Such devices may be
used in surveillance applications for detecting anomalies or extracting
features such as speed of moving objects. Multiple sensors may be used with a
single aperture assembly to capture multi-view images simultaneously. A
prototype was built by using a LCD panel and a photoelectric sensor for
capturing images of visible spectrum.


title:
Discovery of the Optical Counterparts to Four Energetic Fermi
  Millisecond Pulsars

abstract:
  In the last few years, over 43 millisecond radio pulsars have been discovered
by targeted searches of unidentified gamma-ray sources found by the Fermi
Gamma-Ray Space Telescope. A large fraction of these millisecond pulsars are in
compact binaries with low-mass companions. These systems often show eclipses of
the pulsar signal and are commonly known as black widows and redbacks because
the pulsar is gradually destroying its companion. In this paper, we report on
the optical discovery of four strongly irradiated millisecond pulsar
companions. All four sources show modulations of their color and luminosity at
the known orbital periods from radio timing. Light curve modelling of our
exploratory data shows that the equilibrium temperature reached on the
companion's dayside with respect to their nightside is consistent with about
10-30% of the available spin-down energy from the pulsar being reprocessed to
increase the companion's dayside temperature. This value compares well with the
range observed in other irradiated pulsar binaries and offers insights about
the energetics of the pulsar wind and the production of gamma-ray emission. In
addition, this provides a simple way of estimating the brightness of irradiated
pulsar companions given the pulsar spin-down luminosity. Our analysis also
suggests that two of the four new irradiated pulsar companions are only
partially filling their Roche lobe. Some of these sources are relatively bright
and represent good targets for spectroscopic follow-up. These measurements
could enable, among other things, mass determination of the neutron stars in
these systems.


title:
Effective interactions and fluctuation effects in spin-singlet
  superfluids

abstract:
  We derive and evaluate one-loop functional flow equations for the effective
interactions, self-energy and gap function in spin-singlet superfluids. The
flow is generated by a fermionic frequency cutoff, which is supplemented by an
external pairing field to treat divergencies associated with the Goldstone
boson. To parametrize the singular momentum and frequency dependences of the
effective interactions, the Nambu interaction vertex is decomposed in charge,
magnetic, and normal and anomalous pairing channels. The one-loop flow solves
reduced (mean-field) models for superfluidity exactly, and captures also
important fluctuation effects. The Ward identity from charge conservation is
generally violated, but can be enforced by projecting the flow. Applying the
general formalism to the two-dimensional attractive Hubbard model, we obtain
detailed results on the momentum and frequency dependences of the effective
interactions for weak and moderate bare interactions. The gap is reduced by
fluctuations, with a stronger reduction at weaker interactions, as expected.


title: Theory of unitary Bose gases

abstract:
  We develop an analytical approach for the description of an atomic Bose gas
at unitarity. By focusing in first instance on the evaluation of the
single-particle density matrix, we derive several universal properties of the
unitary Bose gas, such as the chemical potential, the contact, the speed of
sound, the condensate density and the effective interatomic interaction. The
theory is also generalized to describe Bose gases with a finite scattering
length and then reduces to the Bogoliubov theory in the weak-coupling limit.


title:
Informant Discrepancies and the Heritability of Antisocial Behavior: A
  Meta-Analysis

abstract:
  Antisocial behavior, which includes both aggressive and delinquent
activities, is the opposite of prosocial behavior. Researchers have studied the
heritability of antisocial behavior among twin and non-twin sibling pairs from
behavioral ratings made by parents, teachers, observers, and youth. Through a
meta-analysis, we examined longitudinal and cross sectional research in the
behavioral genetics of antisocial behavior, consisting of 42 studies, of which
38 were studies of twin pairs, 3 were studies of twins and non-twin siblings,
and 1 was a study of adoptees. These studies provided n = 89 heritability (h2)
effect size estimates from a total of 94,517 sibling pairs who ranged in age
from 1.5 to 18 years; studies provided data for 29 moderators (predictors). We
employed a random-effects meta-analysis model to achieve three goals: (a)
perform statistical inference of the overall heritability distribution in the
underlying population of studies, (b) identify significant study level
moderators (predictors) of heritability, and (c) examine how the heritability
distribution varied as a function of age and type of informant, particularly in
longitudinal research. The meta-analysis indicated a bimodal overall
heritability distribution, indicating two clusters of moderate and high
heritability values, respectively; identified four moderators that predicted
significant changes in mean heritability; and indicated differential patterns
of median h2 and variance (interquartile ranges) across informants and ages. We
argue for a cross-perspective, cross-setting model for selecting informants in
behavioral genetic research, that is flexible and sensitive to changes in
antisocial behavior over time.


title:
Lipschitz Properties of Nonsmooth Functions and Set-Valued Mappings via
  Generalized Differentiation and Applications

abstract:
  In this paper, we revisit the Mordukhovich's subdifferential criterion for
Lipschitz continuity of nonsmooth functions and coderivative criterion for the
Aubin/Lipschitz-like property of set-valued mappings in finite dimensions. The
criteria are useful and beautiful results in modern variational analysis
showing the state of the art of the field. As an application, we establish
necessary and sufficient conditions for Lipschitz continuity of the minimal
time function and the scalarization function, that play an important role in
many aspects of nonsmooth analysis and optimization.


title:
Optimal lower bounds for eigenvalues of linear and nonlinear Neumann
  problems

abstract:
  In this paper we prove a sharp lower bound for the first nontrivial Neumann
eigenvalue $\mu_1(\Omega)$ for the $p$-Laplace operator in a Lipschitz, bounded
domain $\Omega$ in $\R^n$. Our estimate does not require any convexity
assumption on $\Omega$ and it involves the best isoperimetric constant relative
to $\Omega$.


title:
Conservative Regridding When Grid Cell Edges Are Unknown -- Case of
  SCRIP

abstract:
  Nowadays, climate models rely on couplers. Each complete climate model is
broken into different sub-models (oceanic, atmospheric,...), each one working
on a different grid. The coupler brings these models together and interpolates
the physical quantities between the grids. However, neither the coupler nor
sometimes the sub-models themselves know precisely the grid cell edges. They
only know the grid cell corners (vertices) and the true grid cell areas. Thus,
the coupler has to make assumptions about the grid cell edges in order to
compute the grid cell intersections. For first-order schemes, the most
straightforward way to interpolate scalar quantities is to directly use these
approximate grid cell intersections, that don' take the true grid cell areas
into account. It is the method used in the "conservative" regridding option
implemented in the widely used spherical interpolation package SCRIP. We show
that is doesn't preserve integrals in the general case, whether the coupler
using the SCRIP-generated weights transmits directly the intensive quantity, or
its extensive counterpart (that is the same quantity multiplied by the true
area of the individual source grid cell). We show how to modify the
interpolation scheme to preserve integrals in the general case.


title: On wave propagation in viscoelastic media with concave creep compliance

abstract:
  It is proved that the attenuation function of a viscoelastic medium with a
non-decreasing and concave creep compliance is sublinear in the high frequency
range.


title:
The role of transfer operators and shifts in the study of fractals:
  encoding-models, analysis and geometry, commutative and non-commutative

abstract:
  We study a class of dynamical systems in $L^2$ spaces of infinite products
$X$. Fix a compact Hausdorff space $B$. Our setting encompasses such cases when
the dynamics on $X = B^\bn$ is determined by the one-sided shift in $X$, and by
a given transition-operator $R$. Our results apply to any positive operator $R$
in $C(B)$ such that $R1 = 1$. From this we obtain induced measures $\Sigma$ on
$X$, and we study spectral theory in the associated $L^2(X,\Sigma)$.
  For the second class of dynamics, we introduce a fixed endomorphism $r$ in
the base space $B$, and specialize to the induced solenoid $\Sol(r)$. The
solenoid $\Sol(r)$ is then naturally embedded in $X = B^\bn$, and $r$ induces
an automorphism in $\Sol(r)$. The induced systems will then live in
$L^2(\Sol(r), \Sigma)$.
  The applications include wavelet analysis, both in the classical setting of
$\br^n$, and Cantor-wavelets in the setting of fractals induced by affine
iterated function systems (IFS). But our solenoid analysis includes such
hyperbolic systems as the Smale-Williams attractor, with the endomorphism $r$
there prescribed to preserve a foliation by meridional disks. And our setting
includes the study of Julia set-attractors in complex dynamics.


title: Dynamic structure factor for 3He in two-dimensions

abstract:
  Recent neutron scattering experiments on 3He films have observed a zero-sound
mode, its dispersion relation and its merging with -and possibly emerging from-
the particle-hole continuum. Here we address the study of the excitations in
the system via quantum Monte Carlo methods: we suggest a practical scheme to
calculate imaginary time correlation functions for moderate-size fermionic
systems. Combined with an efficient method for analytic continuation, this
scheme affords an extremely convincing description of the experimental
findings.


title:
Weakly coupled two slow- two fast systems, folded node and mixed mode
  oscillationsM

abstract:
  We study Mixed Mode Oscillations (MMOs) in systems of two weakly coupled
slow/fast oscillators. We focus on the existence and properties of a folded
singularity called FSN II that allows the emergence of MMOs in the presence of
a suitable global return mechanism. As FSN II corresponds to a transcritical
bifurcation for a desingularized reduced system, we prove that, under certain
non-degeneracy conditions, such a transcritical bifurcation exists. We then
apply this result to the case of two coupled systems of FitzHugh- Nagumo type.
This leads to a non trivial condition on the coupling that enables the
existence of MMOs.


title: Heralded photonic interaction between distant single ions

abstract:
  We establish heralded interaction between two remotely trapped single 40Ca+
ions through the exchange of single photons. In the sender ion, we release
single photons with controlled temporal shape on the P_3/2 to D_5/2 transition
and transmit them to the distant receiver ion. Individual absorption events in
the receiver ion are detected by quantum jumps. For continuously generated
photons, the absorption reduces significantly the lifetime of the long-lived
D_5/2 state. For triggered single-photon transmission, we observe coincidence
between the emission at the sender and quantum jump events at the receiver.


title:
Gamma-ray lines and One-Loop Continuum from s-channel Dark Matter
  Annihilations

abstract:
  The era of indirect detection searches for dark matter has begun, with the
sensitivities of gamma-ray detectors now approaching the parameter space
relevant for weakly interacting massive particles. In particular, gamma ray
lines would be smoking gun signatures of dark matter annihilation, although
they are typically suppressed compared to the continuum. In this paper, we pay
particular attention to the 1-loop continuum generated together with the
gamma-ray lines and investigate under which conditions a dark matter model can
naturally lead to a line signal that is relatively enhanced. We study generic
classes of models in which DM is a fermion that annihilates through an
s-channel mediator which is either a vector or scalar and identify the coupling
and mass conditions under which large line signals occur. We focus on the
"forbidden channel mechanism" advocated a few years ago in the "Higgs in space"
scenario for which tree level annihilation is kinematically forbidden today.
Detailed calculations of all 1-loop annihilation channels are provided. We
single out very simple models with a large line over continuum ratio and
present general predictions for a large range of WIMP masses that are relevant
not only for Fermi and Hess II but also for the next generation of telescopes
such as CTA and Gamma-400. Constraints from the relic abundance, direct
detection and collider bounds are also discussed.


title: Mumford-Tate groups of polarizable Hodge structures

abstract:
  We classify the possible Mumford-Tate groups of polarizable rational Hodge
structures. Along the way we deduce a polarized Hodge-theoretic analogue of a
conjectural property of motivic Galois groups suggested by Serre.


title: New Candidate Massive Clusters from 2MASS

abstract:
  Massive stars are important for the evolution of the interstellar medium. The
detailed study of their properties (such as mass loss, rotation, magnetic
fields) is enormously facilitated by samples of these objects in young massive
galactic star clusters. Using 2MASS we have searched for so far unknown
candidates of red supergiant clusters along the Galactic Plane. Utilising deep
high resolution UKIDSS GPS and VISTA VVV data to study colour-magnitude
diagrams, we uncover six new massive cluster candidates in the inner Galaxy. If
spectroscopically confirmed as real clusters, two of them could be part of the
Scutum-Complex. One cluster candidate has a number of potential red supergiant
members comparable to RSGC1 and 3.
  Our investigation of UKIDSS data reveals for the first time the main sequence
of the massive cluster RSGC2. The stars of the sequence show an increased
projected density at the same position as the known red supergiants in the
cluster and have E(J-K)=1.6mag. This either indicates an unusual extinction law
along the line of sight or a much lower near infrared extinction to the cluster
than previously estimated in the literature. We suggest that psf-photometry in
UKIDSS images might be able to uncover the main sequence of other RSGC
clusters.


title: Testing for Homogeneity in Mixture Models

abstract:
  Statistical models of unobserved heterogeneity are typically formalized as
mixtures of simple parametric models and interest naturally focuses on testing
for homogeneity versus general mixture alternatives. Many tests of this type
can be interpreted as $C(\alpha)$ tests, as in Neyman (1959), and shown to be
locally, asymptotically optimal. These $C(\alpha)$ tests will be contrasted
with a new approach to likelihood ratio testing for general mixture models. The
latter tests are based on estimation of general nonparametric mixing
distribution with the Kiefer and Wolfowitz (1956) maximum likelihood estimator.
Recent developments in convex optimization have dramatically improved upon
earlier EM methods for computation of these estimators, and recent results on
the large sample behavior of likelihood ratios involving such estimators yield
a tractable form of asymptotic inference. Improvement in computation efficiency
also facilitates the use of a bootstrap methods to determine critical values
that are shown to work better than the asymptotic critical values in finite
samples. Consistency of the bootstrap procedure is also formally established.
We compare performance of the two approaches identifying circumstances in which
each is preferred.


title:
Common quantum phase transition in quasicrystals and heavy-fermion
  metals

abstract:
  Extraordinary new materials named quasicrystals and characterized by
noncrystallographic rotational symmetry and quasiperiodic translational
properties have attracted scrutiny. Study of quasicrystals may shed light on
the most basic notions related to the quantum critical state observed in
heavy-fermion metals. We show that the electronic system of some quasicrystals
is located at the fermion condensation quantum phase transition without tuning.
In that case the quasicrystals possess the quantum critical state with the
non-Fermi liquid behavior which in magnetic fields transforms into the Landau
Fermi-liquid one. Remarkably, the quantum critical state is robust despite the
strong disorder experienced by the electrons. We also demonstrate for the first
time that quasicrystals exhibit the typical scaling behavior of their
thermodynamic properties such as the magnetic susceptibility, and belong to the
famous family of heavy-fermion metals. Our calculated thermodynamic properties
are in good agreement with recent experimental observations.


title:
Optical coupling to nanoscale optomechanical cavities for near
  quantum-limited motion transduction

abstract:
  A significant challenge in the development of chip-scale
cavity-optomechanical devices as testbeds for quantum experiments and classical
metrology lies in the coupling of light from nanoscale optical mode volumes to
conventional optical components such as lenses and fibers. In this work we
demonstrate a high-efficiency, single-sided fiber-optic coupling platform for
optomechanical cavities. By utilizing an adiabatic waveguide taper to transform
a single optical mode between a photonic crystal zipper cavity and a
permanently mounted fiber, we achieve a collection efficiency for intracavity
photons of 52% at the cavity resonance wavelength of 1538nm. An optical
balanced homodyne measurement of the displacement fluctuations of the
fundamental in-plane mechanical resonance at 3.3 MHz reveals that the
imprecision noise floor lies a factor of 2.8 above the standard quantum limit
(SQL) for continuous position measurement, with a predicted total added noise
of 1.4 phonons at the optimal probe power. The combination of extremely low
measurement noise and robust fiber alignment presents significant progress
towards single-phonon sensitivity for these sorts of integrated
micro-optomechanical cavities.


title: Logarithmic Representability of Integers as k-Sums

abstract:
  A set A=A_{k,n} in [n]\cup{0} is said to be an additive k-basis if each
element in {0,1,...,kn} can be written as a k-sum of elements of A in at least
one way. Seeking multiple representations as k-sums, and given any function
phi(n), with lim(phi(n))=infinity, we say that A is a truncated
phi(n)-representative k-basis for [n] if for each j in [alpha n, (k-alpha)n]
the number of ways that j can be represented as a k-sum of elements of A_{k,n}
is Theta(phi(n)). In this paper, we follow tradition and focus on the case
phi(n)=log n, and show that a randomly selected set in an appropriate
probability space is a truncated log-representative basis with probability that
tends to one as n tends to infinity. This result is a finite version of a
result proved by Erdos (1956) and extended by Erdos and Tetali (1990).


title: A completely random T-tessellation model and Gibbsian extensions

abstract:
  In their 1993 paper, Arak, Clifford and Surgailis discussed a new model of
random planar graph. As a particular case, that model yields tessellations with
only T-vertices (T-tessellations). Using a similar approach involving Poisson
lines, a new model of random T-tessellations is proposed. Campbell measures,
Papangelou kernels and Georgii-Nguyen-Zessin formulae are translated from point
process theory to random T-tessellations. It is shown that the new model shows
properties similar to the Poisson point process and can therefore be considered
as a completely random T-tessellation. Gibbs variants are introduced leading to
models of random T-tessellations where selected features are controlled. Gibbs
random T-tessellations are expected to better represent observed tessellations.
As numerical experiments are a key tool for investigating Gibbs models, we
derive a simulation algorithm of the Metropolis-Hastings-Green family.


title: A deformation formula for the heat kernel

abstract:
  Let us consider a time-dependent differential operator quadratic with respect
to the phase variables. Let us consider a multiplication operator defined with
the help of a "small" matrix-valued function. Under suitable conditions, we
give an "explicit" expression of "the" heat kernel associated to the sum of the
two previous operators for small time.


title: Realization of tunnel barriers for matter waves using spatial gaps

abstract:
  We experimentally demonstrate the trapping of a propagating Bose-Einstein
Condensate in a Bragg cavity produced by an attractive optical lattice with a
smooth envelope. As a consequence of the envelope, the band gaps become
position-dependent and act as mirrors of finite and velocity-dependent
reflectivity. We directly observe both the oscillations of the wave packet
bouncing in the cavity provided by these spatial gaps and the tunneling out for
narrow classes of velocity. Synchronization of different classes of velocity
can be achieved by proper shaping of the envelope. This technique can generate
single or multiple tunnel barriers for matter waves with a tunable transmission
probability, equivalent to a standard barrier of submicron size.


title: Efficient computation of steady solitary gravity waves

abstract:
  An efficient numerical method to compute solitary wave solutions to the free
surface Euler equations is reported. It is based on the conformal mapping
technique combined with an efficient Fourier pseudo-spectral method. The
resulting nonlinear equation is solved via the Petviashvili iterative scheme.
The computational results are compared to some existing approaches, such as the
Tanaka method and Fenton's high-order asymptotic expansion. Several important
integral quantities are numerically computed for a large range of amplitudes.
The integral representation of the velocity and acceleration fields in the bulk
of the fluid is also provided.

categories: physics.flu-dyn nlin.SI physics.ao-ph physics.class-ph


title: Polarit\'es d\'efinies par un triangle

abstract:
  A polarity of a projective plane is a map, often assumed to be involutive,
mapping a generic point to a generic line and reciprocally. The most classical
polarity is the polarity with respect to a conic, but other exist: the harmonic
polarity with respect to a triangle, the polarities with respect to high-degree
algebraic curve, the polarities with respect to a convex set. In this article,
we introduce a polarity with respect to a triangle motivated by a question on
duality of projective frames. We show that the four polarities above apply to a
triangle and in fact coincide. This result is an opportunity to review nice
concepts of projective geometry, linear algebra and convex geometry.


title:
Some A priori estimates for the homogeneous Landau equation with soft
  potentials

abstract:
  This paper deals with the derivation of some \'a priori estimates for the
homogeneous Landau equation with soft potentials. Using the coercivity of the
Landau operator for soft potentials, we prove a global estimate of weak
solutions in $L^2$ space without any smallness assumption on the initial data
for $ -2 < \gamma <0$. For the stronger case $ -3 \leq \gamma \leq -2$, which
covers in particular the Coulomb case, we get such a global estimate, but in
some weighted $L^2$ space and under a smallness assumption on initial data.


title: Magnetic phase diagram of $Sr_3 Fe_2 O_{7-x}$

abstract:
  Magnetometry, electrical transport, and neutron scattering measurements were
performed on single crystals of the Fe^{4+}-containing perovskite-related phase
Sr_3Fe_2O_7-x as a function of oxygen content. Although both the crystal
structure and electron configuration of this compound are closely similar to
those of well-studied ruthenates and manganates, it exhibits very different
physical properties. The fully-oxygenated compound (x=0) exhibits a
charge-disproportionation transition at T_D = 340 K, and an antiferromagnetic
transition at T_N = 115 K. For temperatures T \leq T_D, the material is a
small-gap insulator; the antiferromagnetic order is incommensurate, which
implies competing exchange interactions between the Fe^{4+} moments. The
fully-deoxygenated compound (x=1) is highly insulating, and its Fe^{3+} moments
exhibit commensurate antiferromagnetic order below T_N ~ 600 K. Compounds with
intermediate x exhibit different order with lower T_N, likely as a consequence
of frustrated exchange interactions between Fe^{3+} and Fe^{4+} sublattices. A
previous proposal that the magnetic transition temperature reaches zero is not
supported.


title: On a spectral sequence for the cohomology of infinite loop spaces

abstract:
  We study the mod-2 cohomology spectral sequence arising from delooping the
Bousfield-Kan cosimplicial space giving the 2-nilpotent completion of a
connective spectrum $X$. Under good conditions its $E_{2}$-term is computable
as certain non-abelian derived functors evaluated at $H^*(X)$ as a module over
the Steenrod algebra, and it converges to the cohomology of $\Omega^\infty X$.
We provide general methods for computing the $E_{2}$-term, including the
construction of a multiplicative spectral sequence of Serre type for
cofibration sequences of simplicial commutative algebras. Some simple examples
are also considered; in particular, we show that the spectral sequence
collapses at $E_{2}$ when $X$ is a suspension spectrum.


title:
Multiplicity of Galactic Cepheids from long-baseline interferometry I.
  CHARA/MIRC detection of the companion of V1334 Cygni

abstract:
  We aim at determining the masses of Cepheids in binary systems, as well as
their geometric distances and the flux contribution of the companions. The
combination of interferometry with spectroscopy will offer a unique and
independent estimate of the Cepheid masses. Using long-baseline interferometry
at visible and infrared wavelengths, it is possible to spatially resolve binary
systems containing a Cepheid down to milliarcsecond separations. Based on the
resulting visual orbit and radial velocities, we can then derive the
fundamental parameters of these systems, particularly the masses of the
components and the geometric distance. We therefore performed interferometric
observations of the first-overtone mode Cepheid V1334 Cyg with the CHARA/MIRC
combiner. We report the first detection of a Cepheid companion using
long-baseline interferometry. We detect the signature of a companion orbiting
V1334 Cyg at two epochs. We measure a flux ratio between the companion and the
Cepheid f = 3.10+/-0.08%, giving an apparent magnitude mH = 8.47+/-0.15mag. The
combination of interferometric and spectroscopic data have enabled the unique
determination of the orbital elements: P = 1938.6+/-1.2 days, Tp = 2 443
616.1+/-7.3, a = 8.54+/-0.51mas, i = 124.7+/-1.8{\deg}, e = 0.190+/-0.013,
{\omega} = 228.7+/-1.6{\deg}, and {\Omega} = 206.3+/-9.4{\deg}. We derive a
minimal distance d ~ 691 pc, a minimum mass for both stars of 3.6 Msol, with a
spectral type earlier than B5.5V for the companion star. Our measured flux
ratio suggests that radial velocity detection of the companion using
spectroscopy is within reach, and would provide an orbital parallax and
model-free masses.


title:
Ferromagnetic Exchange Anisotropy from Antiferromagnetic Superexchange
  in the Mixed 3d-5d Transition-Metal Compound Sr3CuIrO6

abstract:
  We report a combined experimental and theoretical study of the unusual
ferromagnetism in the one-dimensional copper-iridium oxide Sr$_3$CuIrO$_6$.
Utilizing Ir $L_3$ edge resonant inelastic x-ray scattering, we reveal a large
gap magnetic excitation spectrum. We find that it is caused by an unusual
exchange anisotropy generating mechanism, namely, strong ferromagnetic
anisotropy arising from antiferromagnetic superexchange, driven by the
alternating strong and weak spin-orbit coupling on the $5d$ Ir and 3d Cu
magnetic ions, respectively. From symmetry consideration, this novel mechanism
is generally present in systems with edge-sharing Cu$^{2+}$O$_4$ plaquettes and
Ir$^{4+}$O$_6$ octahedra. Our results point to unusual magnetic behavior to be
expected in mixed 3d-5d transition-metal compounds via exchange pathways that
are absent in pure 3d or 5d compounds.


title:
A Universe with a generalized ghost dark energy and Van der Waals fluid
  interacting with a fluid

abstract:
  In this paper, we consider an unusual connection between different fluids.
Having established a research goal we would like to consider a toy model of the
Universe and investigate its behavior, especially for later time evolution for
well known facts. The main goal of the article is to consider a toy model of
the Universe with generalized ghost dark energy, Van der Waals gas and a
phenomenologically modified fluid. The origin of the last component can be
understood as a result of interaction between some original fluid and some
source of energy or matter in Universe. By unusual connection we mean an
assumption that generalized ghost dark energy has its contribution to the model
by an interaction term $Q$ and we suppose an interaction of the form
$Q=3Hb(\rho_{\small{tot}}-\rho_{GDe})$. Graphical analysis is performed and the
questions of validity of the generalized second law of thermodynamics and
stability of the model also approached in this paper.


title: Optical solitons in graded-index multimode fiber

abstract:
  Solitons are non-dispersing localized waves that occur in diverse physical
settings. A variety of optical solitons have been observed, but versions that
involve both spatial and temporal degrees of freedom are rare. Optical fibers
designed to support multiple transverse modes offer opportunities to study wave
propagation in a setting that is intermediate between single-mode fiber and
free-space propagation. Here we report the observation of optical solitons and
soliton self-frequency shifting in graded-index multimode fiber. These wave
packets can be modeled as multi-component solitons, or as solitons of the
Gross-Pitaevskii equation. Solitons in graded-index fibers should enable
increased data rates in low-cost telecommunications systems, are pertinent to
space-division multiplexing, and can offer a new route to mode-area scaling for
high-power lasers and transmission.


title: What kind of energy is the mass?

abstract:
  In 1905, Einstein discovered the famous equation: E=mc^2, which means that
the rest mass of a particle is some kind of energy. This energy is generally
referred to as "rest energy", since the particle is believed to be at rest.
This paper proposes a new interpretation to the term mc^2. Observing the
similarity between the term mc^2 and the kinetic energy term mv^2/2, we propose
to interpret mc^2 as being one term of kinetic energy. In other words we
propose that, in the called "rest frame", the massive particles are not really
at rest, but they are doing a special kind of motion at the light speed c. In
this interpretation the "mass" is not an intrinsic property of the particle.
The "mass" is simply the kinetic energy associated with this special kind of
motion. The more important consequence of this hypothesis is that the term
mc^2, present in the relativistic Hamiltonian, must be rewritten as: mc^2 =>
p_0 c, where p_0 = mc is the modulus of the instantaneous linear moment
\vec{p}_0 associated with the special motion. We analyse a physical scenario in
which this special motion is a Microscopic Orbital Circular Motion (MOCM). The
characteristic length scale of the MOCM is of the order of the Compton
wavelength of the particle.


title:
Stability of compressible reduced magnetohydrodynamic equilibria -
  analogy with magnetorotational instability

abstract:
  Stability analyses for equilibria of the compressible reduced
magnetohydrodynamics (CRMHD) model are carried out by means of the
Energy-Casimir (EC) method. Stability results are compared with those obtained
for ideal magnetohydrodynamics (MHD) from the classical {\delta}W criterion. An
identification of the terms in the second variation of the free energy
functional for CRMHD with those of {\delta}W is made: two destabilizing effects
present for CRMHD turn out to correspond to the kink and interchange
instabilities in usual MHD, while the stabilizing roles of field line bending
and compressibility are also identified in the reduced model. Also, using the
EC method, stability conditions in the presence of toroidal flow are obtained.
A formal analogy between CRMHD and a reduced incompressible model for
magnetized rotating disks, due to Julien and Knobloch [EAS Pub. Series, 21, 81
(2006)], is discovered. In light of this analogy, energy stability analysis
shows that the condition for magnetorotational instability (MRI) for the latter
model, corresponds to the condition for interchange instability in CRMHD, with
the Coriolis term and shear velocity playing the roles of the curvature term
and pressure gradient, respectively. Using the EC method, stability conditions
for the rotating disk model, for a large class of equilibria with possible
non-uniform magnetic fields, are obtained. In particular, this shows it is
possible for the MRI system to undergo, in addition to the MRI, another
instability that is analogous to the kink instability. For vanishing magnetic
field, the Rayleigh hydrodynamical stability condition is recovered.


title: Intensity and State Estimation in Quantum Cryptography

abstract:
  This paper describes how the communicating parties can employ intensity and
state estimation to detect if the eavesdropper has siphoned off and injected
photons in the received communication. This is of relevance in quantum
cryptography based on random rotations of photon polarizations.


title:
Braiding of Atomic Majorana Fermions in Wire Networks and Implementation
  of the Deutsch-Josza Algorithm

abstract:
  We propose an efficient protocol for braiding atomic Majorana fermions in
wire networks with AMO techniques and demonstrate its robustness against
experimentally relevant errors. Based on this protocol we provide a
topologically protected implementation of the Deutsch-Josza algorithm.


title:
A non-LTE modeling of narrow emission components of He and Ca lines in
  optical spectra of CTTS

abstract:
  A spectrum of a hot spot, produced by radiation of accretion shock at T Tauri
star's surface, has been calculated taking into account non-LTE effects for
HeI, HeII, CaI and CaII, using LTE-calculations of spot's atmospheric
structure, calculated by Dodin & Lamzin (2012). Assuming that pre-shock gas
number density N_0 and its velocity V_0 are the same across the accretion
column, we calculated spectra of a system "star + round spot" for a set of N_0,
V_0 values and parameters, which characterized the star and the spot.
  It has been shown that theoretical spectra with an appropriate choice of the
parameters reproduce well observed veiling of photospheric absorption lines in
optical band as well as profiles and intensities of so-called narrow components
of HeII and CaI emission lines in spectra of 9 stars. We found that the
accreted gas density N_0>10^{12} cm^{-3} for all considered stars except DK
Tau. Observed spectra of 8 stars were succesfully fitted, asuming solar
abundance of calcium, but it appeared possible to fit TW Hya spectrum only
under assumption that calcium abundance in accreted gas was three times less
than solar. We derive spot's parameters by comparison of theoretical and
observed spectra, normalised to continuum level, so our results are independent
on unknown value of interstellar extinction.
  We have found that the predicted flux in CaII lines is less than observed
one, but this discrepancy can be resolved if not only high-density but also
lower density gas falls onto the star. Theoretical equivalent widths as well as
relative intensities of He\,I subordinate lines disagree significantly with
observations, presumbly due to a number of reasons: necessity to take into
account non-LTE thermal structure of upper layers of a hot spot, poorly known
collisional atomic data for HeI upper levels and inhomogeneity of the hot spot.


title: Gottlieb Groups of Function Spaces

abstract:
  We analyze the Gottlieb groups of function spaces. Our results lead to
explicit decompositions of the Gottlieb groups of many function spaces
map(X,Y)---including the (iterated) free loop space of Y---directly in terms of
the Gottlieb groups of Y. More generally, we give explicit decompositions of
the generalized Gottlieb groups of map(X,Y) directly in terms of generalized
Gottlieb groups of Y. Particular cases of our results relate to the torus
homotopy groups of Fox. We draw some consequences for the classification of
T-spaces and G-spaces. For X, Y finite and Y simply connected, we give a
formula for the ranks of the Gottlieb groups of map(X,Y) in terms of the Betti
numbers of X and the ranks of the Gottlieb groups of Y. Under these hypotheses,
the Gottlieb groups of map(X,Y) are finite groups in all but finitely many
degrees.


title: Vibrational spectroscopy of polar molecules with superradiance

abstract:
  We investigate cooperative phenomena and superradiance for vibrational
transitions in polar molecule spectroscopy when a high optical-depth (OD)
sample is studied. Such cooperativity comes from the build-up of inter-particle
coherence through dipole-dipole interactions and leads to the speed-up of decay
process. We compare our calculation to recent work [Deiglmayr et al., Eur.
Phys. J. D 65, 99 (2011)] and find very good agreement, suggesting that
superradiant effects need to be included in a wide variety of ultracold
molecule setups including vibrational and rotational states.


title:
Inverse Transitions in the Ghatak-Sherrington model with Bimodal Random
  Fields

abstract:
  The present work studies the Ghatak-Sherrington (GS) model with the presence
of a longitudinal magnetic random field (RF) $h_{i}$ following a bimodal
distribution. The model considers a random bond interaction $J_{i,j}$ which
follows a Gaussian distribution with mean $J_0/N$ and variance $J^2/N$. This
allows us to introduce the bond disorder strength parameter $J/J_0$ to probe
the combined effects of disorder coming from the random bond and the discrete
RF over unusual phase transitions known as inverse transitions (ITs). The
results within a mean field approximation indicate that these two types of
disorder have complete distinct roles for the ITs. They indicate that bond
disorder creates the necessary conditions for the presence of inverse freezing
or even inverse melting depending on the bond disorder strength, while the RF
tends to enforce mechanisms that destroy the ITs.


title:
Polynomial force approximations and multifrequency atomic force
  microscopy

abstract:
  We present polynomial force reconstruction from experimental intermodulation
atomic force microscopy (ImAFM) data. We study the tip-surface force during a
slow surface approach and compare the results with amplitude-dependence force
spectroscopy. Based on polynomial force reconstruction we generate
high-resolution surface property maps of polymer blend samples. The polynomial
method is described as a special example of a more general approximataive force
reconstruction, where the aim is to determine model parameters which best
approximate the measured force spectrum. This approximative approach is not
limited to spectral data and we demonstrate how is can adapted to a force
quadrature picture.


title:
Three-dimensional Fourier transforms, integrals of spherical Bessel
  functions, and novel delta function identities

abstract:
  We present a general approach for evaluating a large variety of
three-dimensional Fourier transforms. The transforms considered include the
useful cases of the Coulomb and dipole potentials, and include situations where
the transforms are singular and involve terms proportional to the Dirac delta
function. Our approach makes use of the Rayleigh expansion of exp(i p.r) in
terms of spherical Bessel functions, and we study a number of integrals,
including singular integrals, involving a power of the independent variable
times a spherical Bessel function. We work through several examples of
three-dimensional Fourier transforms using our approach and show how to derive
a number of identities involving multiple derivatives of 1/r, 1/r^2, and
delta(\vec r).


title:
Spatiotemporal two-dimensional solitons in the complex Ginzburg-Landau
  equation

abstract:
  We introduce spatiotemporal solitons of the two-dimensional complex
Ginzburg-Landau equation (2D CCQGLE) with cubic and quintic nonlinearities in
which asymmetry between space-time variables is included. The 2D CCQGLE is
solved by a powerful Fourier spectral method, i.e., a Fourier spatial
discretization and an explicit scheme for time differencing. Varying the
system's parameters, and using different initial conditions, numerical
simulations reveal 2D solitons in the form of stationary, pulsating and
exploding solitons which possess very distinctive properties. For certain
regions of parameters, we have also found stable coherent structures in the
form of spinning (vortex) solitons which exist as a result of a competition
between focusing nonlinearities and spreading while propagating through medium.


title: How instanton combinatorics solves Painlev\'e VI, V and III's

abstract:
  We elaborate on a recently conjectured relation of Painlev\'e transcendents
and 2D CFT. General solutions of Painlev\'e VI, V and III are expressed in
terms of $c=1$ conformal blocks and their irregular limits, AGT-related to
instanton partition functions in $\mathcal{N}=2$ supersymmetric gauge theories
with $N_f=0,1,2,3,4$. Resulting combinatorial series representations of
Painlev\'e functions provide an efficient tool for their numerical computation
at finite values of the argument. The series involve sums over bipartitions
which in the simplest cases coincide with Gessel expansions of certain Toeplitz
determinants. Considered applications include Fredholm determinants of
classical integrable kernels, scaled gap probability in the bulk of the GUE,
and all-order conformal perturbation theory expansions of correlation functions
in the sine-Gordon field theory at the free-fermion point.


title: Highlights from BNL-RHIC-2012

abstract:
  Recent highlights from Brookhaven National Laboratory and the Relativistic
Heavy Ion Collider (RHIC) are reviewed and discussed in the context of the
discovery of the strongly interacting Quark Gluon Plasma (sQGP) at RHIC in 2005
as confirmed by results from the CERN-LHC Pb+Pb program. Outstanding RHIC
machine operation in 2012 with 3-dimensional stochastic cooling and a new EBIS
ion source enabled measurements with Cu+Au, U+U, for which multiplicity
distributions are shown, as well as with polarized p-p collisions. Differences
of the physics and goals of p-p versus A+A are discussed leading to a review of
RHIC results on pi0 suppression in Au+Au collisions and comparison to LHC Pb+Pb
results in the same range 5<pT<20 GeV. Results of the RHIC Au+Au energy scan
show that high pT suppression takes over from the "Cronin Effect" for c.m.
energies > 30 GeV. Improved measurements of direct photon production and
correlation with charged particles at RHIC are shown, including the absence of
a low pT (thermal) photon enhancement in d+Au collisions. Attempts to
understand the apparent equality of the energy loss of light and heavy quarks
in the QGP by means of direct measurements of charm and beauty particles at
both RHIC and LHC are discussed.


title: On the essential spectrum of the Laplacian and the drifted Laplacian

abstract:
  This paper concerns the $L^2$ essential spectrum of the Laplacian $\Delta$
and the drift Laplacian $\Delta_f$ on complete Riemannian manifolds endowed
with a weighted measure $e^{-f}d\;vol_g$. We prove that the essential spectrum
of the drift Laplacian $\Delta_f$ is $[0,+\infty) $ provided the Bakry-\'Emery
curvature tensor $Ric_f$ is nonnegative and $f$ has sublinear growth . When
$Ric_f \geq 1/2 g$ and $|\nabla f|^2 \leq f$, we show that the essential
spectrum of the Laplacian is also $[0,+\infty)$. During the proofs of these
results, the $f$-volume growth estimate plays an important role and may be of
independent interest.


title: Counting using Hall Algebras II. Extensions from Quivers

abstract:
  We count the $\mathbb{F}_q$-rational points of GIT quotients of quiver
representations with relations. We focus on two types of algebras -- one is
one-point extended from a quiver $Q$, and the other is the Dynkin $A_2$
tensored with $Q$. For both, we obtain explicit formulas. We study when they
are polynomial-count. We follow the similar line as in the first paper but
algebraic manipulations in Hall algebra will be replaced by corresponding
geometric constructions.


title:
The Capacity Region of the Wireless Ergodic Fading Interference Channel
  with Partial CSIT to Within One Bit

abstract:
  Fundamental capacity limits are studied for the two-user wireless ergodic
fading IC with partial Channel State Information at the Transmitters (CSIT)
where each transmitter is equipped with an arbitrary deterministic function of
the channel state (this model yields a full control over how much state
information is available). One of the main challenges in the analysis of fading
networks, specifically multi-receiver networks including fading ICs, is to
obtain efficient capacity outer bounds. In this paper, a novel capacity outer
bound is established for the two-user ergodic fading IC. For this purpose, by a
subtle combination of broadcast channel techniques (i.e., manipulating mutual
information functions composed of vector random variables by Csiszar-Korner
identity) and genie-aided techniques, first a single-letter outer bound
characterized by mutual information functions including some auxiliary random
variables is derived. Then, by novel arguments the derived bound is optimized
over its auxiliaries only using the entropy power inequality. Besides being
well-described, our outer bound is efficient from several aspects.
Specifically, it is optimal for the fading IC with uniformly strong
interference. Also, it is sum-rate optimal for the channel with uniformly mixed
interference. More importantly, it is proved that when each transmitter has
access to any amount of CSIT that includes the interference to noise ratio of
its non-corresponding receiver, the outer bound differs by no more than one bit
from the achievable rate region given by Han-Kobayashi scheme. This result is
viewed as a natural generalization of the ETW to within one bit capacity result
for the static channel to the wireless ergodic fading case.


title: On the Capacity Region of the Two-User Interference Channel

abstract:
  One of the key open problems in network information theory is to obtain the
capacity region for the two-user Interference Channel (IC). In this paper, new
results are derived for this channel. As a first result, a noisy interference
regime is given for the general IC where the sum-rate capacity is achieved by
treating interference as noise at the receivers. To obtain this result, a
single-letter outer bound in terms of some auxiliary random variables is first
established for the sum-rate capacity of the general IC and then those
conditions under which this outer bound is reduced to the achievable sum-rate
given by the simple treating interference as noise strategy are specified. The
main benefit of this approach is that it is applicable for any two-user IC
(potentially non-Gaussian). For the special case of Gaussian channel, our
result is reduced to the noisy interference regime that was previously
obtained. Next, some results are given on the Han-Kobayashi (HK) achievable
rate region. The evaluation of this rate region is in general difficult. In
this paper, a simple characterization of the HK rate region is derived for some
special cases, specifically, for a novel very weak interference regime. As a
remarkable characteristic, it is shown that for this very weak interference
regime, the achievable sum-rate due to the HK region is identical to the one
given by the simple treating interference as noise strategy.


title: Operational geometric phase for mixed quantum states

abstract:
  Geometric phase has found a broad spectrum of applications in both classical
and quantum physics, such as condensed matter and quantum computation. In this
paper we introduce an operational geometric phase for mixed quantum states,
based on spectral weighted traces of holonomies, and we prove that it
generalizes the standard definition of geometric phase for mixed states, which
is based on quantum interferometry. We also introduce higher order geometric
phases, and prove that under a fairly weak, generically satisfied, requirement,
there is always a well-defined geometric phase of some order. Our approach
applies to general unitary evolutions of both nondegenerate and degenerate
mixed states. Moreover, since we provide an explicit formula for the geometric
phase that can be easily implemented, it is particularly well suited for
computations in quantum physics.


title: The cohomology of the motivic Steenrod algebra over Spec C

abstract:
  The purpose of this article is to compute the cohomology of the motivic
Steenrod algebra over Spec C through the geometric 70-stem. The main
computational tool is the motivic May spectral sequence. Everywhere in this
article, we are working only over Spec C, and we are always computing at the
prime p = 2.


title:
Charged Higgs Production in Association With W^{\pm} at Large Hadron
  Colliders

abstract:
  Many new physics models beyond the standard model, such as the littlest higgs
models and the left right twin higgs models, predict the existence of the large
charged higgs couplings H^-q\bar b and H^+b\bar q, where q=t or the new
vector-like heavy quark T; On the other hand, some new physics models like the
littlest higgs also predict the gauge-higgs couplings. Such couplings may have
rich collider phenomenology. We focus our attention on these couplings induced
by the littlest higgs models and the left right twin higgs models models and
consider their contributions to the production cross section for W^\pm H^\mp
production at the large hadron colliders. We find that the cross sections, in
the littlest higgs models, on the parton level gg \to W^\pm H^\mp and q\bar q
\to W^\pm H^\mp (q=u,d,s,c,b) may reach tens of several dozen femtobarns in
reasonable parameters space at the collision energy of 14 TeV and that the
total cross section can even reach a few hundred femtobarns in certain favored
space. While in the left right twin higgs models, the production rates are
basically one order lower than these in littlest higgs. Therefore, due to the
large cross sections of that in the littlest higgs, it may be possible to probe
the charged higgs via this process in a large parameter space.


title: Cosmological Parameters from Pre-Planck CMB Measurements

abstract:
  Recent data from the WMAP, ACT and SPT experiments provide precise
measurements of the cosmic microwave background temperature power spectrum over
a wide range of angular scales. The combination of these observations is well
fit by the standard, spatially flat LCDM cosmological model, constraining six
free parameters to within a few percent. The scalar spectral index, n_s =
0.9690 +/- 0.0089, is less than unity at the 3.6 sigma level, consistent with
simple models of inflation. The damping tail of the power spectrum at high
resolution, combined with the amplitude of gravitational lensing measured by
ACT and SPT, constrains the effective number of relativistic species to be
N_eff = 3.28 +/- 0.40, in agreement with the standard model's three species of
light neutrinos.


title: Adaptive Compressive Spectrum Sensing for Wideband Cognitive Radios

abstract:
  This letter presents an adaptive spectrum sensing algorithm that detects
wideband spectrum using sub-Nyquist sampling rates. By taking advantage of
compressed sensing (CS), the proposed algorithm reconstructs the wideband
spectrum from compressed samples. Furthermore, an l2 norm validation approach
is proposed that enables cognitive radios (CRs) to automatically terminate the
signal acquisition once the current spectral recovery is satisfactory, leading
to enhanced CR throughput. Numerical results show that the proposed algorithm
can not only shorten the spectrum sensing interval, but also improve the
throughput of wideband CRs.


title: Fermi Velocity Modulation in Graphene by Strain Engineering

abstract:
  Using full-potential density functional theory (DFT) calculations, we found a
small asymmetry in the Fermi velocity of electrons and holes in graphene. These
Fermi velocity values and their average were found to decrease with increasing
in-plane homogeneous biaxial strain; the variation in Fermi velocity is
quadratic in strain. The results, which can be verified by Landau level
spectroscopy and quantum capacitance measurements of bi-axially strained
graphene, promise potential applications in graphene based straintronics and
flexible electronics.


title:
Geometry of quantum dynamics and a time-energy uncertainty relation for
  mixed states

abstract:
  In this paper we establish important relations between Hamiltonian dynamics
and Riemannian structures on phase spaces for unitarily evolving finite level
quantum systems in mixed states. We show that the energy dispersion (i.e.
$1/\hbar$ times the path integral of the energy uncertainty) of a unitary
evolution is bounded from below by the length of the evolution curve. Also, we
show that for each curve of mixed states there is a Hamiltonian for which the
curve is a solution to the corresponding von Neumann equation, and the energy
dispersion equals the curve's length. This allows us to express the distance
between two mixed states in terms of a measurable quantity, and derive a
time-energy uncertainty relation for mixed states. In a final section we
compare our results with an energy dispersion estimate by Uhlmann.


title: Linked-Cluster Technique for Finding the Distance of a Quantum LDPC Code

abstract:
  We present a linked-cluster technique for calculating the distance of a
quantum LDPC code. It offers an advantage over existing deterministic
techniques for codes with small relative distances (which includes all known
families of quantum LDPC codes), and over the probabilistic technique for codes
with sufficiently high rates.


title:
Geometry of almost-product Lorentzian manifolds and relativistic
  observer

abstract:
  The notion of relativistic observer is confronted with Naveira's
classification of (pseudo-)Riemannian almost-product structures on space-time
manifolds. Some physical properties and their geometrical counterparts are
shortly discussed.


title: Wideband Spectrum Sensing with Sub-Nyquist Sampling in Cognitive Radios

abstract:
  Multi-rate asynchronous sub-Nyquist sampling (MASS) is proposed for wideband
spectrum sensing. Corresponding spectral recovery conditions are derived and
the probability of successful recovery is given. Compared to previous
approaches, MASS offers lower sampling rate, and is an attractive approach for
cognitive radio networks.


title:
H Index of History journals published in Spain according to Google
  Scholar Metrics (2007-2011)

abstract:
  Google Scholar Metrics (GSM), which was recently launched in April 2012,
features new bibliometric systems for gauging scientific journals by counting
the number of citations obtained in Google Scholar. This way, it opens new
possibilities for measuring journal impacts in the field of Humanities. The
present article intends to evaluate the scope of this tool through analysing
GSM searches, from the 5th through 6th of December 2012, of History journals
published in Spain. In sum, 69 journals were identified, accounting for only
24% of the History journals published in Spain. The ranges of H index values
for this field are so small that the ranking can no longer be said to show a
discriminating potential. In the light of this, we would like to propose a
change in the way Google Scholar Metrics is designed so that it could also
accommodate production and citation patterns in the particular field of
History, and, in a broader scope, in the area of Humanities as well.


title:
A classical Perron method for existence of smooth solutions to boundary
  value and obstacle problems for degenerate-elliptic operators via holomorphic
  maps

abstract:
  We prove existence of solutions to boundary value problems and obstacle
problems for degenerate-elliptic, linear, second-order partial differential
operators with partial Dirichlet boundary conditions using a new version of the
Perron method. The elliptic operators considered have a degeneracy along a
portion of the domain boundary which is similar to the degeneracy of a model
linear operator identified by Daskalopoulos and Hamilton (1998) in their study
of the porous medium equation or the degeneracy of the Heston operator (1993)
in mathematical finance. Existence of a solution to the Dirichlet problem on a
half-ball, where the operator becomes degenerate on the flat boundary and a
Dirichlet condition is only imposed on the spherical boundary, provides the key
additional ingredient required for our Perron method. The solution to the
Dirichlet problem on the half-ball can be converted to a Dirichlet problem on
an infinite slab via a suitable diffeomorphism which becomes holomorphic in
dimension two. The required Schauder regularity theory and existence of a
solution to the Dirichlet problem on the slab can nevertheless be obtained
using previous work of the author and C. Pop [arXiv:1210.6727]. Our Perron
method relies on weak and strong maximum principles for degenerate-elliptic
operators, concepts of continuous subsolutions and supersolutions for boundary
value and obstacle problems for degenerate-elliptic operators, and maximum and
comparison principle estimates previously developed by the author
[arXiv:1204.6613].


title: On the Robust superhedging of measurable claims

abstract:
  The problem of robust hedging requires to solve the problem of superhedging
under a nondominated family of singular measures. Recent progress was achieved
by [9,11]. We show that the dual formulation of this problem is valid in a
context suitable for martingale optimal transportation or, more generally, for
optimal transportation under controlled stochastic dynamics.


title: On the functional form of the metallicity-giant planet correlation

abstract:
  It is generally accepted that the presence of a giant planet is strongly
dependent on the stellar metallicity. A stellar mass dependence has also been
investigated, but this dependence does not seem as strong as the metallicity
dependence. Even for metallicity, however, the exact form of the correlation
has not been established. In this paper, we test several scenarios for
describing the frequency of giant planets as a function of its host parameters.
We perform this test on two volume-limited samples (from CORALIE and HARPS). By
using a Bayesian analysis, we quantitatively compared the different scenarios.
We confirm that giant planet frequency is indeed a function of metallicity.
However, there is no statistical difference between a constant or an
exponential function for stars with subsolar metallicities contrary to what has
been previously stated in the literature. The dependence on stellar mass could
neither be confirmed nor be discarded.


title: Torsion in tensor products, and tensor powers, of modules

abstract:
  For finitely generated modules M and N over a complete intersection R, the
vanishing of Tor_i^R(M,N) for all i> 0 gives a tight relationship among depth
properties of M, N and their tensor product. Here we concentrate on the
converse and show, under mild conditions, that the tensor product of M and N
being torsion-free (or satisfying higher Serre conditions) forces vanishing of
Tor. Special attention is paid to the case of tensor powers of a single module.


title:
Cooperative effects enhance the transport properties of molecular spider
  teams

abstract:
  Molecular spiders are synthetic molecular motors based on DNA nanotechnology.
While natural molecular motors have evolved towards very high efficiency, it
remains a major challenge to develop efficient designs for man-made molecular
motors. Inspired by biological motor proteins like kinesin and myosin,
molecular spiders comprise a body and several legs. The legs walk on a lattice
that is coated with substrate which can be cleaved catalytically. We propose a
novel molecular spider design in which n spiders form a team. Our theoretical
considerations show that coupling several spiders together alters the dynamics
of the resulting team significantly. Although spiders operate at a scale where
diffusion is dominant, spider teams can be tuned to behave nearly ballistic,
which results in fast and predictable motion. Based on the separation of time
scales of substrate and product dwell times, we develop a theory which utilises
equivalence classes to coarse-grain the micro-state space. In addition, we
calculate diffusion coefficients of the spider teams, employing a mapping of an
n-spider team to an n-dimensional random walker on a confined lattice. We
validate these results with Monte Carlo simulations and predict optimal
parameters of the molecular spider team architecture which makes their motion
most directed and maximally predictable.


title: New Global F-theory GUTs with U(1) symmetries

abstract:
  We construct global F-theory GUTs with SU(5) x U(1) gauge group defined by
specifying a fully resolved Calabi-Yau fourfold and consistent four-form
G-flux. Its specific U(1) charged matter spectrum allows the desired Yukawa
couplings, but forbids dangerous proton decay operators. The model we find: (1)
does not follow from an underlying higgsed E8 gauge group (2) leaves the class
of theories that can be analyzed with current split-spectral cover techniques.
This avoids recently proposed no-go theorems for models with hypercharge flux,
as required to break the GUT group. The appearance of additional fields is
related geometrically to considering a more general class of sections and 4-1
splits. We show explicitly that the four-dimensional chiral matter index can
still be computed using three-dimensional one-loop Chern-Simons terms.