title:
The Fundamental Learning Problem that Genetic Algorithms with Uniform
  Crossover Solve Efficiently and Repeatedly As Evolution Proceeds

abstract:
  This paper establishes theoretical bonafides for implicit concurrent
multivariate effect evaluation--implicit concurrency for short---a broad and
versatile computational learning efficiency thought to underlie
general-purpose, non-local, noise-tolerant optimization in genetic algorithms
with uniform crossover (UGAs). We demonstrate that implicit concurrency is
indeed a form of efficient learning by showing that it can be used to obtain
close-to-optimal bounds on the time and queries required to approximately
correctly solve a constrained version (k=7, \eta=1/5) of a recognizable
computational learning problem: learning parities with noisy membership
queries. We argue that a UGA that treats the noisy membership query oracle as a
fitness function can be straightforwardly used to approximately correctly learn
the essential attributes in O(log^1.585 n) queries and O(n log^1.585 n) time,
where n is the total number of attributes. Our proof relies on an accessible
symmetry argument and the use of statistical hypothesis testing to reject a
global null hypothesis at the 10^-100 level of significance. It is, to the best
of our knowledge, the first relatively rigorous identification of efficient
computational learning in an evolutionary algorithm on a non-trivial learning
problem.


title: On the Instabilities of the Walker Propagating Domain Wall Solution

abstract:
  A powerful mathematical method for front instability analysis that was
recently developed in the field of nonlinear dynamics is applied to the 1+1
(spatial and time) dimensional Landau-Lifshitz-Gilbert (LLG) equation. From the
essential spectrum of the LLG equation, it is shown that the famous Walker
rigid body propagating domain wall (DW) is not stable against the spin wave
emission. In the low field region only stern spin waves are emitted while both
stern and bow waves are generated under high fields. By using the properties of
the absolute spectrum of the LLG equation, it is concluded that in a high
enough field, but below the Walker breakdown field, the Walker solution could
be convective/absolute unstable if the transverse magnetic anisotropy is larger
than a critical value, corresponding to a significant modification of the DW
profile and DW propagating speed. Since the Walker solution of 1+1 dimensional
LLG equation can be realized in experiments, our results could be also used to
test the mathematical method in a controlled manner.


title: Critical phenomena in the bifurcation line's perspective

abstract:
  On the phase diagram of a system undergoing a continuous phase transition of
the second order, three lines, hyper-surfaces, convergent into the critical
point feature prominently: the ordered and disordered phases in the
thermodynamic limit, and a third line, extending into a domain of finite-size
systems, defined by the bifurcation of the distribution of the order parameter.
Unlike critical phenomena in the thermodynamic limit devoid of known
thermodynamic potential and described rather by the conformal symmetry, in
finite-size systems near the bifurcation line an explicit Hamiltonian for the
zero-mode of the order parameter is found. It bears the impress of the
universality class of the critical point in terms of the two critical
exponents: $\beta$ and $\nu$.


title:
Non-Equilibrium 2PI Potential and Its Possible Application to Evaluation
  of Bulk Viscosity

abstract:
  Within non-equilibrium Green's function technique on the real-time contour
and the two-particle-irreducable (2PI) $\Phi$-functional method, a
non-equilibrium potential is introduced. It naturally generalizes the
conventional thermodynamic potential with which it coincides in thermal
equilibrium. Variations of the non-equilibrium potential over respective
parameters result in the same quantities as those of the thermodynamic
potential but in arbitrary non-equilibrium. In particular, for slightly
non-equilibrium inhomogeneous configurations a variation of the non-equilibrium
potential over volume is associated with the trace of the non-equilibrium
stress tensor. The latter is related to the bulk viscosity. This provides a
novel way for evaluation of the bulk viscosity.


title:
Thermal spin injection and accumulation in CoFe/MgO tunnel contacts to
  n-type Si through Seebeck spin tunneling

abstract:
  We report the thermal spin injection and accumulation in crystalline CoFe/MgO
tunnel contacts to n-type Si through Seebeck spin tunneling (SST). With the
Joule heating (laser heating) of Si (CoFe), the thermally induced spin
accumulation is detected by means of the Hanle effect for both polarities of
the temperature gradient across the tunnel contact. The magnitude of the
thermal spin signal scales linearly with the heating power and its sign is
reversed as we invert the temperature gradient, demonstrating the major
features of SST and thermal spin accumulation. We observe that, for the Si
(CoFe) heating, the thermal spin signal induced by SST corresponds to the
majority (minority) spin accumulation in the Si. Based on a quantitative
comparison of thermal and electrical spin signals, it is noted that the thermal
spin injection through SST can be a viable approach for the efficient injection
of spin accumulation


title:
Quantum interference oscillations of the superparamagnetic blocking in
  an Fe8 molecular nanomagnet

abstract:
  We show that the dynamic magnetic susceptibility and the superparamagnetic
blocking temperature of an Fe8 single molecule magnet oscillate as a function
of the magnetic field Hx applied along its hard magnetic axis. These
oscillations are associated with quantum interferences, tuned by Hx, between
different spin tunneling paths linking two excited magnetic states. The
oscillation period is determined by the quantum mixing between the ground S=10
and excited multiplets. These experiments enable us to quantify such mixing. We
find that the weight of excited multiplets in the magnetic ground state of Fe8
amounts to approximately 11.6%.


title: Fusion coefficients and random walks in alcoves

abstract:
  We point out a connection between fusion coefficients and random walks in a
fixed level alcove associated to the root system of an affine Lie algebra and
use this connection to solve completely the Dirichlet problem on such an alcove
for a large class of simple random walks. We establish a correspondence between
the hypergroup of conjugacy classes of a compact Lie group and the fusion
hypergroup. We prove that a random walk in an alcove, obtained with the help of
fusion coefficients, converges, after a proper normalization, towards the
radial part of a Brownian motion on a compact Lie group.


title:
Transverse and lateral confinement effects on the oscillations of a free
  cylinder in a viscous flow

abstract:
  The different types of instabilities of free cylinders (diameter $D$, length
$L$) have been studied in a viscous flow (velocity $U$) between parallel
vertical walls of horizontal width $W$ at a distance $H$: the influence of the
confinement parameters $D/H$ and $L/W$ has been investigated. As $D/H$
increases, there is a transition from stable flow to oscillations transverse to
the walls and then to a fluttering motion with oscillations of the angle of the
axis with respect to the horizontal. The two types of oscillations may be
superimposed in the transition domain. The frequency $f$ of the transverse
oscillations is independent of the lateral confinement $L/W$ in the range:
0.055 \le L/W \le 0.94$ for a given cylinder velocity $V_{cx}$ and increases
only weakly with $V_{cx}$. These results are accounted for by assuming a 2D
local flow over the cylinder with a characteristic velocity independent of
$L/W$ for a given $V_{cx}$ value. The experimental values of $f$ are also
independent of the transverse confinement $D/H$. The frequency $f_f$ of the
fluttering motion is significantly lower than $f$: $f_f$ is also nearly
independent of the cylinder diameter and of the flow velocity but decreases
significantly as $L/W$ increases. The fluttering instability is then rather a
3D phenomenon involving the full length of the cylinder and the clearance
between its ends and the side walls.


title: A simple presentation of the effective topos

abstract:
  We propose for the Effective Topos an alternative construction: a
realisability framework composed of two levels of abstraction. This
construction simplifies the proof that the Effective Topos is a topos (equipped
with natural numbers), which is the main issue that this paper addresses. In
this our work can be compared to Frey's monadic tripos-to-topos construction.
However, no topos theory or even category theory is here required for the
construction of the framework itself, which provides a semantics for
higher-order type theories, supporting extensional equalities and the axiom of
unique choice.


title: Massive Parallelization of STED Nanoscopy Using Optical Lattices

abstract:
  Recent developments in stimulated emission depletion (STED) microscopy
achieved nanometer scale resolution and showed great potential in live cell
imaging. Yet, STED nanoscopy techniques are based on single point-scanning.
This constitutes a drawback for wide field imaging, since the gain in spatial
resolution requires dense pixelation and hence long recording times. Here we
achieve massive parallelization of STED nanoscopy using wide-field excitation
together with well-designed optical lattices for depletion and a fast camera
for detection. Acquisition of large field of view super-resolved images
requires scanning over a single unit cell of the optical lattice which can be
as small as 290 nm*290nm. Interference STED (In-STED) images of 2.9 {\mu}m* 2.9
{\mu}m with resolution down to 70 nm are obtained at 12.5 frames per second.
The development of this technique opens many prospects for fast wide-field
nanoscopy.


title:
Generation and manipulation of entangled photons in a domain-engineered
  lithium niobate waveguide

abstract:
  We propose to integrate the electro-optic tuning function into
polarization-entangled photon pair generation process in a periodically poled
lithium niobate (PPLN). Due to the versatility of PPLN, both the spontaneously
parametric down conversion and electro-optic polarization rotation effects
could be realized simultaneously. Orthogonally-polarized and parallel-polarized
photon pairs thus are instantly switchable by tuning the applied field. The
characteristics of the source are investigated showing adjustable bandwidths
and high entanglement degrees. Moreover, other kinds of reconfigurable
entanglement are also achievable based on suitable domain-design. We believe
the domain engineering is a very promising solution for next generation
function-integrated quantum circuits.


title:
Joint Optimization of Radio Resources and Code Partitioning in Mobile
  Edge Computing

abstract:
  The aim of this paper is to propose a computation offloading strategy for
mobile edge computing. We exploit the concept of call graph, which models a
generic computer program as a set of procedures related to each other through a
weighted directed graph. Our goal is to derive the optimal partition of the
call graph establishing which procedures are to be executed locally or
remotely. The main novelty of our work is that the optimal partition is
obtained jointly with the selection of radio parameters, e.g., transmit power
and constellation size, in order to minimize the energy consumption at the
mobile handset, under a latency constraint taking into account transmit time
and execution time. We consider both single and multi-channel transmission
strategies and we prove that a globally optimal solution can be achieved in
both cases. Finally, we propose a suboptimal strategy aimed at solving a
relaxed version of the original problem in order to tradeoff complexity and
performance of the proposed framework. Finally, several numerical results
illustrate under what conditions in terms of call graph topology, communication
strategy, and computation parameters, the proposed offloading strategy provides
large performance gains.


title: Sobolev estimates for two dimensional gravity water waves

abstract:
  Our goal in this paper is to apply a normal forms method to estimate the
Sobolev norms of the solutions of the water waves equation. We construct a
paradifferential change of unknown, without derivatives losses, which
eliminates the part of the quadratic terms that bring non zero contributions in
a Sobolev energy inequality. Our approach is purely Eulerian: we work on the
Craig-Sulem-Zakharov formulation of the water waves equation. In addition to
these Sobolev estimates, we also prove $L^2$-estimates for the
$\partial_x^\alpha Z^\beta$-derivatives of the solutions of the water waves
equation, where $Z$ is the Klainerman vector field $t\partial_t +2x\partial_x$.
These estimates are used in another paper where we prove a global existence
result for the water waves equation with smooth, small, and decaying at
infinity Cauchy data, and we obtain an asymptotic description in physical
coordinates of the solution, which shows that modified scattering holds. The
proof of this global in time existence result relies on the simultaneous
bootstrap of some H\"older and Sobolev a priori estimates for the action of
iterated Klainerman vector fields on the solutions of the water waves equation.
The present paper contains the proof of the Sobolev part of that bootstrap.


title:
Gaussian solitary waves and compactons in Fermi-Pasta-Ulam lattices with
  Hertzian potentials

abstract:
  We consider a class of fully-nonlinear Fermi-Pasta-Ulam (FPU) lattices,
consisting of a chain of particles coupled by fractional power nonlinearities
of order $\alpha >1$. This class of systems incorporates a classical Hertzian
model describing acoustic wave propagation in chains of touching beads in the
absence of precompression. We analyze the propagation of localized waves when
$\alpha$ is close to unity. Solutions varying slowly in space and time are
searched with an appropriate scaling, and two asymptotic models of the chain of
particles are derived consistently. The first one is a logarithmic KdV
equation, and possesses linearly orbitally stable Gaussian solitary wave
solutions. The second model consists of a generalized KdV equation with
H\"older-continuous fractional power nonlinearity and admits compacton
solutions, i.e. solitary waves with compact support. When $\alpha \rightarrow
1^+$, we numerically establish the asymptotically Gaussian shape of exact FPU
solitary waves with near-sonic speed, and analytically check the pointwise
convergence of compactons towards the limiting Gaussian profile.

categories: nlin.PS cond-mat.mtrl-sci cond-mat.soft math.AP math.DS


title: An obstacle problem for Tug-of-War games

abstract:
  We consider the obstacle problem for the infinity Laplace equation. Given a
Lipschitz boundary function and a Lipschitz obstacle we prove the existence and
uniqueness of a super infinity-harmonic function constrained to lie above the
obstacle which is infinity harmonic where it lies strictly above the obstacle.
Moreover, we show that this function is the limit of value functions of a game
we call obstacle tug-of-war.


title: Finitely presented subgroups of systolic groups are systolic

abstract:
  In this note we prove that every finitely presented subgroup of a systolic
group is itself systolic.


title: Circular symmetry in the Hitchin system

abstract:
  To study circularly symmetric field configurations in the SU(2) Hitchin
system an SO(2) symmetry, [J_3, \phi]=0 and [J_3, A_{\pm}]=\pm A_{\pm}, is
imposed on the Higgs scalar \phi and the gauge fields A_{\pm} of the system,
respectively, where J_3 is a sum of the third components of the orbital angular
momenta and the generators of the SU(2). The circular symmetry and the equation
\bar{D}\phi=0 yield onstant, generally nonzero, vacuum expectation values for
{\rm Tr}(\phi^{2}). The equation 4F_{z\bar{z}}=[\phi, \phi^{*}] yields a system
of differential equations which govern the circularly symmetric field
configurations and an exact solution to these equations in a pure gauge form
with nontrivial Higgs scalar is obtained.


title: Arithmetic Differential Equations of Painleve' VI Type

abstract:
  Using the description of Paileve' VI family of differential equations in
terms of a universal elliptic curve, going back to R. Fuchs (cf. [Ma96]), we
translate it into the realm of Arithmetic Differential Equations (cf. [Bu05]),
where the role of derivative "in the $p$--adic direction" is played by a
version of Fermat quotient


title: Thermoelectric effects in silicene nanoribbons

abstract:
  Transport and thermoelectric coefficients (including also spin thermopower)
of silicene nanoribbons with zigzag edges are investigated by {\it ab-initio}
numerical methods. Local spin density of such nanoribbons reveals edge
magnetism. Like in graphene, one finds antiferromagnetic and ferromagnetic
ordering, with spin polarization at one edge antiparallel or parallel to that
at the other edge, respectively. Thermoelectric properties, especially the
Seebeck coefficient, significantly depend on the electronic band structure and
are enhanced when the Fermi level is in the energy gap. However, these
thermoelectric properties are significantly reduced when the phonon
contribution to the heat conductance is included. This phonon contribution has
been calculated numerically by two different methods. Transition from
antiferromagnetic to ferromagnetic states leads to a large magnetoresistance as
well as to a considerable magnetothermopower. Thermoelectric parameters in the
antiparallel configuration, when spin polarization in the left part of the
nanoribbon is opposite to that in the right part, are also analyzed.


title: A New Subspace Iteration method for the Algebraic Riccati Equation

abstract:
  We consider the numerical solution of the continuous algebraic Riccati
equation $A^*X+XA-XFX+G=0$, with $F=F^*, G=G^*$ of low rank and $A$ large and
sparse. We develop an algorithm for the low rank approximation of $X$ by means
of an invariant subspace iteration on a function of the associated Hamiltonian
matrix. We show that the sought after approximation can be obtained by a low
rank update, in the style of the well known ADI iteration for the linear
equation, from which the new method inherits many algebraic properties.
Moreover, we establish new insightful matrix relations with emerging
projection-type methods, which will help increase our understanding of this
latter class of solution strategies.


title:
Magnetic Field Extrapolations in the Corona: Success and Future
  Improvements

abstract:
  The solar atmosphere being magnetic in nature, the understanding of the
structure and evolution of the magnetic field in different regions of the solar
atmosphere has been an important task over the past decades. This task has been
made complicated by the difficulties to measure the magnetic field in the
corona, while it is currently known with a good accuracy in the photosphere
and/or chromosphere. Thus, to determine the coronal magnetic field, a
mathematical method has been developed based on the observed magnetic field.
This is the so-called magnetic field extrapolation technique. This technique
relies on two crucial points: (i) the physical assumption leading to the system
of differential equations to be solved, (ii) the choice and quality of the
associated boundary conditions. In this review, I summarise the physical
assumptions currently in use and the findings at different scales in the solar
atmosphere. I concentrate the discussion on the extrapolation techniques
applied to solar magnetic data and the comparison with observations in a broad
range of wavelengths (from hard X-rays to radio emission).


title:
Connected components of affine Deligne-Lusztig varieties in mixed
  characteristic

abstract:
  We determine the set of connected components of minuscule affine
Deligne-Lusztig varieties for special maximal compact subgroups of unramified
connected reductive groups. Partial results are also obtained for non-minuscule
closed affine Deligne-Lusztig varieties. We consider both the function field
case and its analog in mixed characteristic. In particular, we determine the
set of connected components of unramified Rapoport-Zink spaces.


title: Bayesian Structured Prediction Using Gaussian Processes

abstract:
  We introduce a conceptually novel structured prediction model, GPstruct,
which is kernelized, non-parametric and Bayesian, by design. We motivate the
model with respect to existing approaches, among others, conditional random
fields (CRFs), maximum margin Markov networks (M3N), and structured support
vector machines (SVMstruct), which embody only a subset of its properties. We
present an inference procedure based on Markov Chain Monte Carlo. The framework
can be instantiated for a wide range of structured objects such as linear
chains, trees, grids, and other general graphs. As a proof of concept, the
model is benchmarked on several natural language processing tasks and a video
gesture segmentation task involving a linear chain structure. We show
prediction accuracies for GPstruct which are comparable to or exceeding those
of CRFs and SVMstruct.


title: On the cohomology of the Milnor fibre of a hyperplane arrangement

abstract:
  We investigate the cohomology of the Milnor fibre of a reflection arrangement
as a module for the group $\Gamma$ generated by the reflections, together with
the cyclic monodromy.
  Although we succeed completely only for unitary reflection groups of rank
two, we establish some general results which relate the isotypic componenents
of the monodromy on the cohomology, to the Hodge structure and to the
cohomology degree.
  Using eigenspace theory for reflection groups, we prove some sum formulae for
additive functions such as the equivariant weight polynomial and certain
polynomials related to the Euler characteristic, such as the Hodge-Deligne
polynomials. We also use monodromy eigenspaces to determine the spectrum in
some cases, which in turn throws light on the Hodge structure of the
cohomology. These methods enable us to compute the complete story, including
the representation of $\Gamma$ on the Hodge components in each cohomology
degree, for some groups of low rank.


title:
Degenerate transition pathways for screw dislocations: implications for
  migration

abstract:
  In body-centred-cubic (bcc) metals migrating 1/2<111> screw dislocations
experience a periodic energy landscape with a triangular symmetry. Atomistic
simulations, such as those performed using the nudged-elastic-band (NEB)
method, generally predict a transition-pathway energy-barrier with a
double-hump; contradicting Ab Initio findings. Examining the trajectories
predicted by NEB for a particle in a Peierls energy landscape representative of
that obtained for a screw dislocation, reveals an unphysical anomaly caused by
the occurrence of monkey saddles in the landscape. The implications for motion
of screws with and without stress are discussed.


title:
Transport coefficients in Lorentz plasmas with the power-law
  kappa-distribution

abstract:
  Transport coefficients in Lorentz plasma with the power-law
kappa-distribution are studied by means of using the transport equation and
macroscopic laws of Lorentz plasma without magnetic field. Expressions of
electric conductivity, thermoelectric coefficient and thermal conductivity for
the power-law kappa-distribution are accurately derived. It is shown that these
transport coefficients are significantly modified by the kappa-parameter, and
in the limit of the parameter kappa to infinit they are reduced to the standard
forms for a Maxwellian distribution.modified

categories: physics.plasm-ph astro-ph.EP physics.geo-ph physics.space-ph


title: Topological enumeration of complex polynomial vector fields

abstract:
  The enumeration of combinatorial classes of the complex polynomial vector
fields in C presented in [Dia13] is extended here to a closed form enumeration
of combinatorial classes for degree d polynomial vector fields up to rotations
of 2(d-1)st roots of unity. The main tool in the proof of this result is based
on a general method of enumeration developed by V.A.Liskovets [Lis98].


title:
On the analogy between L-functions and Atiyah-Bott-Lefschetz trace
  formulas for foliated spaces

abstract:
  This paper is motivated by Deninger's programme. First we prove, using
Alvarez Lopez-Kordyukov results, an Atiyah-Bott-Lefschetz trace formula for the
cohomology groups associated to a ramified leafwise flat line bundle on a
riemannian foliation. Then we argue, by precise computations, that cohomology
groups associated to ramified leafwise flat vector bundles on a suitable
foliated space (whose existence is still unknown) might be useful to study
arithmetic L-functions via Atiyah-Bott-Lefschetz trace formulas.


title: Form factors of $\eta_c$ in light front quark model

abstract:
  We study the form factors of the $\eta_c$ meson in the light-front quark
model. We explicitly show that the transition form factor of $\eta_c \to
\gamma^* \gamma$ as a function of the momentum transfer is consistent with the
experimental data by the BaBar collaboration, while the decay constant of
$\eta_c$ is found to be $f_{\eta_{c}}=230.5^{+52.2}_{-61.0}$ and
$303.6^{+115.2}_{-116.4}$ MeV for $\eta_c\sim c\bar{c}$ by using two $\eta_c
\to \gamma \gamma$ decay widths of $5.3\pm 0.5$ and $7.2\pm2.1$ keV, given by
Particle Data Group and Lattice QCD calculation, respectively.


title: Thermal analysis of 3D associative processor

abstract:
  Thermal density and hot spots limit three-dimensional (3D) implementation of
massively-parallel SIMD processors and prohibit stacking DRAM dies above them.
This study proposes replacing SIMD by an Associative Processor (AP). AP
exhibits close to uniform thermal distribution with reduced hot spots.
Additionally, AP may outperform SIMD processor when the data set size is
sufficiently large, while dissipating less power. Comparative performance and
thermal analysis supported by simulation confirm that AP might be preferable
over SIMD for 3D implementation of large scale massively parallel processing
engines combined with 3D DRAM integration.


title:
Structural evolution in high-pressure amorphous CO$_2$ from \textit{ab
  initio} molecular dynamics

abstract:
  By employing $ab$ $initio$ molecular dynamics simulations at constant
pressure, we investigated behavior of amorphous carbon dioxide between 0-100
GPa and 200-500 K and found several new amorphous forms. We focused on
evolution of the high-pressure polymeric amorphous form known as a-carbonia on
its way down to zero pressure, where it eventually converts into a molecular
amorphous solid. During decompression, two nonmolecular amorphous forms with
different proportion of three and four-coordinated carbons and two mixed
molecular-nonmolecular forms were observed. Transformation from a-carbonia to
the molecular state thus appears to proceed discontinuously via several
intermediate stages suggesting that solid CO$_2$ might exhibit interesting
polyamorphism. We also studied relations of the amorphous forms to their
crystalline counterparts. The tetrahedral-like a-carbonia is most probably
related to phase-V according to their structural properties, while presence of
the mixed forms may reflect hypothetical existence of metastable
three-coordinated polymeric phase that is composed of linear chains. Our
molecular amorphous form seems to be related to phase-I according to molecular
coordination and their relative bond orientations.


title: GAPfm: Optimal Top-N Recommendations for Graded Relevance Domains

abstract:
  Recommender systems are frequently used in domains in which users express
their preferences in the form of graded judgments, such as ratings. If accurate
top-N recommendation lists are to be produced for such graded relevance
domains, it is critical to generate a ranked list of recommended items directly
rather than predicting ratings. Current techniques choose one of two
sub-optimal approaches: either they optimize for a binary metric such as
Average Precision, which discards information on relevance grades, or they
optimize for Normalized Discounted Cumulative Gain (NDCG), which ignores the
dependence of an item's contribution on the relevance of more highly ranked
items.
  In this paper, we address the shortcomings of existing approaches by
proposing the Graded Average Precision factor model (GAPfm), a latent factor
model that is particularly suited to the problem of top-N recommendation in
domains with graded relevance data. The model optimizes for Graded Average
Precision, a metric that has been proposed recently for assessing the quality
of ranked results list for graded relevance. GAPfm learns a latent factor model
by directly optimizing a smoothed approximation of GAP. GAPfm's advantages are
twofold: it maintains full information about graded relevance and also
addresses the limitations of models that optimize NDCG. Experimental results
show that GAPfm achieves substantial improvements on the top-N recommendation
task, compared to several state-of-the-art approaches. In order to ensure that
GAPfm is able to scale to very large data sets, we propose a fast learning
algorithm that uses an adaptive item selection strategy. A final experiment
shows that GAPfm is useful not only for generating recommendation lists, but
also for ranking a given list of rated items.


title:
Identifying conserved protein complexes between species by constructing
  interolog networks

abstract:
  Protein complexes conserved across species indicate processes that are core
to cellular machinery (e.g. cell-cycle or DNA damage-repair complexes conserved
across human and yeast). While numerous computational methods have been devised
to identify complexes from the protein interaction (PPI) networks of individual
species, these are severely limited by noise and errors (false positives) in
currently available datasets. Our analysis using human and yeast PPI networks
revealed that these methods missed several important complexes including those
conserved between the two species (e.g. the MLH1-MSH2-PMS2-PCNA mismatch-repair
complex). Here, we note that much of the functionalities of yeast complexes
have been conserved in human complexes not only through sequence conservation
of proteins but also of critical functional domains. Therefore, integrating
information of domain conservation might throw further light on conservation
patterns between yeast and human complexes.


title: Translation by adaptor-helicase cycle in oligomer world

abstract:
  A mechanism of the translation in oligomer world is proposed. The translation
is carried out by a minimum cycle, which is sustained by adaptors and
helicases, and the first information processing in oligomer world. We expect
that such a cycle actually worked in a primitive cell and can be constructed in
vitro. By computer simulation we have shown that a proofreading is achieved by
the fluctuation in the cell. It is rather paradoxical that the proofreading is
effective for the system consisting of molecular machines with low efficiency.


title: The Carina Project. VI. The helium burning variable stars

abstract:
  We present new optical (BVI) time-series data for the evolved variable stars
in the Carina dwarf spheroidal galaxy. The quality of the data and the
observing strategy allowed us to identify 14 new variable stars. Eight out of
the 14 are RR Lyrae (RRL) stars, four are Anomalous Cepheids (ACs) and two are
geometrical variables. Comparison of the period distribution for the entire
sample of RRLs with similar distributions in nearby dSphs and in the Large
Magellanic Cloud indicates that the old stellar populations in these systems
share similar properties. This finding is also supported by the RRL
distribution in the Bailey diagram. On the other hand, the period distribution
and the Bailey diagram of ACs display significant differences among the above
stellar systems. This evidence suggests that the properties of intermediate-age
stellar populations might be affected both by environmental effects and
structural parameters. We use the BV Period--Wesenheit (PW) relation of RRLs
together with evolutionary prescriptions and find a true distance modulus of
20.09+/-0.07(intrinsic)+/-0.1(statistical) mag that agrees quite well with
similar estimates available in the literature. We identified four peculiar
variables. Taking into account their position in the Bailey diagram and in the
BV PW relation, two of them (V14, V149) appear to be candidate ACs, while two
(V158, V182) might be peculiar RRLs. In particular, the variable V158 has a
period and a V-band amplitude very similar to the low-mass RRL
---RRLR-02792---recently identified by Pietrzynski at al. (2012) in the
Galactic bulge.


title: Revealing quantum path details in high-field physics

abstract:
  The tunnelling of an electron through a suppressed atomic potential followed
by its motion in the continuum, is the fundamental mechanism underlying
strong-field laser-atom/molecule interactions. Due to its quantum nature, the
interaction is governed by the phase of the released electron wave-packets.
Thus, detailed mapping of the electron wave-packet interferences provides
essential insight into the physics underlying the interaction. A process which
is providing access to the intricacies of the interaction is the generation of
high order harmonics of the laser frequency. The phase-amplitude distribution
of the emitted extreme-ultraviolet (EUV), carries the complete information
about the harmonic generation process and vice-versa. Thus, the visualization
of the EUV-spatial-amplitude-distribution, as it results from interfering
electron wave-packet contributions, is of crucial importance. Restrictions to
this accomplishment are due to the spatially integrating measurement approaches
applied so far, that average out the phase effects in the generation process.
In this work, we demonstrate a method which overcomes this obstacle. An
EUV-spatial-amplitude-distribution-image is induced from the imprint on the
measured spatial distribution of ions, produced through EUV-photon ionization
of atoms. Interference extremes in the image carry phase information about the
interfering electron wave-packets. The present approach provides detailed
insight on the strong-field laser-atom interaction mechanism, while
establishing the era of phase selective interaction studies. Furthermore, it
paves the way for substantial enhancement of the spectral and temporal
precision of measurements by in-situ controlling the phase distribution of the
emitted radiation and/or spatially selecting the EUV-radiation-atom interaction
products.


title:
Fluid limits to analyze long-term flow rates of a stochastic network
  with ingress discarding

abstract:
  We study a simple rate control scheme for a multiclass queuing network for
which customers are partitioned into distinct flows that are queued separately
at each station. The control scheme discards customers that arrive to the
network ingress whenever any one of the flow's queues throughout the network
holds more than a specified threshold number of customers. We prove that if the
state of a corresponding fluid model tends to a set where the flow rates are
equal to target rates, then there exist sufficiently high thresholds that make
the long-term average flow rates of the stochastic network arbitrarily close to
these target rates. The same techniques could be used to study other control
schemes. To illustrate the application of our results, we analyze a network
resembling a 2-input, 2-output communications network switch.


title: Characterizations of graded Pr\"ufer $\star$-multiplication domains

abstract:
  Let $R=\bigoplus_{\alpha\in\Gamma}R_{\alpha}$ be a graded integral domain
graded by an arbitrary grading torsionless monoid $\Gamma$, and $\star$ be a
semistar operation on $R$. In this paper we define and study the graded
integral domain analogue of $\star$-Nagata and Kronecker function rings of $R$
with respect to $\star$. We say that $R$ is a graded Pr\"{u}fer
$\star$-multiplication domain if each nonzero finitely generated homogeneous
ideal of $R$ is $\star_f$-invertible. Using $\star$-Nagata and Kronecker
function rings, we give several different equivalent conditions for $R$ to be a
graded Pr\"{u}fer $\star$-multiplication domain. In particular we give new
characterizations for a graded integral domain, to be a P$v$MD.


title:
An alternative to Slepian functions on the unit sphere - A
  space-frequency analysis based on localized spherical polynomials

abstract:
  In this article, we present a space-frequency theory for spherical harmonics
based on the spectral decomposition of a particular space-frequency operator.
The presented theory is closely linked to the theory of ultraspherical
polynomials on the one hand, and to the theory of Slepian functions on the
2-sphere on the other. Results from both theories are used to prove
localization and approximation properties of the new band-limited yet
space-localized basis. Moreover, particular weak limits related to the
structure of the spherical harmonics provide information on the proportion of
basis functions needed to approximate localized functions. Finally, a scheme
for the fast computation of the coefficients in the new localized basis is
provided.


title: Algebraic Complexity Classes

abstract:
  This survey describes, at an introductory level, the algebraic complexity
framework originally proposed by Leslie Valiant in 1979, and some of the
insights that have been obtained more recently.


title:
The Stokes Phase Portraits of Descattered Pulse Profiles of a Few
  Pulsars

abstract:
  The observing signals from pulsar are always influenced by the interstellar
medium (ISM) scattering. In the lower frequency observation, the intensity
profiles are broadened and the plane of polarization angle (PPA) curves are
flattened by the scattering effect of the ISM. So before we analyze the
scattered signal, we should take a proper approach to clear scattering effect
from it. Observing data and simulation have shown that the Stokes phase
portraits $I$-$U$, $I$-$Q$ and $Q$-$U$ are also distorted by the ISM
scattering. In this paper, a simulation is held to demonstrate a scattering and
a descattering of the Stokes phase portraits of a single pulse profile of a
pulsar. As a realization of the simulation method, this paper has studied the
descattering of Stokes phase portraits of lower frequency observation of PSR
B1356$-$60, PSR B1831$-$03, PSR B1859+03, PSR B1946+35.


title: Crossover scaling in the two-dimensional three-state Potts model

abstract:
  We apply simulated tempering and magnetizing (STM) Monte Carlo simulations to
the two-dimensional three-state Potts model in an external magnetic field in
order to investigate the crossover scaling behaviour in the temperature-field
plane at the Potts critical point and towards the Ising universality class for
negative magnetic fields. Our data set has been generated by STM simulations of
several square lattices with sizes up to 160 x 160 spins, supplemented by
conventional canonical simulations of larger lattices at selected simulation
points. We present careful scaling and finite-size scaling analyses of the
crossover behaviour with respect to temperature, magnetic field and lattice
size.


title:
A new exactly solvable spatially one-dimensional quantum superradiance
  fermi-medium model and its quantum solitonic states

abstract:
  A new exactly solvable spatially one-dimensional quantum superradiance model
describing a charged fermionic medium interacting with an external
electromagnetic field is proposed. The infinite hierarchy of quantum
conservation laws and many-particle Bethe eigenstates that model quantum
solitonic impulse structures are constructed. The Hamilton operator
renormalization procedure subject to a physically stable vacuum is described,
the quantum excitations and quantum solitons, related to the thermodynamical
equilibrity of the model, are discussed.


title:
A current algebra approach to the equilibrium classical statistical
  mechanics and its applications

abstract:
  The non-relativistic current algebra approach is analyzed subject to its
application to studying the distribution functions of many-particle systems at
the temperature equilibrium and their stability properties. We show that the
classical Bogolubov generating functional method is a very effective tool for
constructing the irreducible current algebra representations and the
corresponding different generalized measure expansions including collective
variables transform. The effective Hamiltonian operator construction and its
spectrum peculiarities subject to the stability of equilibrium many-particle
systems are discussed.


title: Phase diagrams in inflating balloon

abstract:
  Volume transition of an inflating cylindrical balloon made of rubber under
external force $F$ is studied based on the non-linear elastic theory for
rubber. The pressure difference $\Delta P$ between inside and outside of the
balloon is calculated as a function of the volume $V$ of the fluid inside the
balloon. It is shown that if $F$ is smaller than a critical value $F_c$, the
inflation of the balloon takes place with coexistence of strongly inflated
region and weakly inflated region, while if $F$ is larger than $F_c$, the
inflation takes place uniformly. It is shown that the critical force $F_c$
depends on the material parameter of the rubber, and that the discontinuous
transition for finite stretching force can take place only when the rubber has
enough stretchability


title:
Ferroelectric order parameter in the two-particle cluster system near
  phase transition point: collective variables method

abstract:
  A new approach in the investigation of the order parameter behaviour near
ferroelectric phase transition point is suggested. The short range and dipole
interactions between particles are taken into account. The logarithmic
corrections and effective critical exponents are calculated and discussed.


title:
Nonequilibrium and nonperturbative dynamics of ultrastrong coupling in
  open lines

abstract:
  We study the time and space resolved dynamics of a qubit with an Ohmic
coupling to propagating 1D photons, from weak coupling to the ultrastrong
coupling regime. A nonperturbative study based on Matrix Product States (MPS)
shows the following results: (i) The ground state of the combined systems
contains excitations of both the qubit and the surrounding bosonic field. (ii)
An initially excited qubit equilibrates through spontaneous emission to a
state, which under certain conditions, is locally close to that ground state,
both in the qubit and the field. (iii) The resonances of the combined
qubit-photon system match those of the spontaneous emission process and also
the predictions of the adiabatic renormalization [A. J. Leggett et al., Rev.
Mod. Phys. 59, 1, (1987)]. Finally, a non-perturbative ab-initio calculations
show that this physics can be studied using a flux qubit galvanically coupled
to a superconducting transmission line.


title: Multilayer wave functions: A recursive coupling of local excitations

abstract:
  Finding a succinct representation to describe the ground state of a
disordered interacting system could be very helpful in understanding the
interplay between the interactions that is manifested in a quantum phase
transition. In this work we use some elementary states to construct recursively
an ansatz of multilayer wave functions, where in each step the higher-level
wave function is represented by a superposition of the locally "excited states"
obtained from the lower-level wave function. This allows us to write the
Hamiltonian expectation in terms of some local functions of the variational
parameters, and employ an efficient message-passing algorithm to find the
optimal parameters. We obtain good estimations of the ground-state energy and
the phase transition point for the transverse Ising model with a few layers of
mean-field and symmetric tree states. The work is the first step towards the
application of local and distributed message-passing algorithms in the study of
structured variational problems in finite dimensions.


title: Bicriteria data compression

abstract:
  The advent of massive datasets (and the consequent design of high-performing
distributed storage systems) have reignited the interest of the scientific and
engineering community towards the design of lossless data compressors which
achieve effective compression ratio and very efficient decompression speed.
Lempel-Ziv's LZ77 algorithm is the de facto choice in this scenario because of
its decompression speed and its flexibility in trading decompression speed
versus compressed-space efficiency. Each of the existing implementations offers
a trade-off between space occupancy and decompression speed, so software
engineers have to content themselves by picking the one which comes closer to
the requirements of the application in their hands. Starting from these
premises, and for the first time in the literature, we address in this paper
the problem of trading optimally, and in a principled way, the consumption of
these two resources by introducing the Bicriteria LZ77-Parsing problem, which
formalizes in a principled way what data-compressors have traditionally
approached by means of heuristics. The goal is to determine an LZ77 parsing
which minimizes the space occupancy in bits of the compressed file, provided
that the decompression time is bounded by a fixed amount (or vice-versa). This
way, the software engineer can set its space (or time) requirements and then
derive the LZ77 parsing which optimizes the decompression speed (or the space
occupancy, respectively). We solve this problem efficiently in O(n log^2 n)
time and optimal linear space within a small, additive approximation, by
proving and deploying some specific structural properties of the weighted graph
derived from the possible LZ77-parsings of the input file. The preliminary set
of experiments shows that our novel proposal dominates all the highly
engineered competitors, hence offering a win-win situation in theory&practice.


title:
Effect of metallic walls on dynamos generated by laminar boundary-driven
  flow in a spherical domain

abstract:
  We present a numerical study of dynamo action in a conducting fluid encased
in a metallic spherical shell. Motions in the fluid are driven by differential
rotation of the outer metallic shell, which we refer to as "the wall". The two
hemispheres of the wall are held in counter-rotation, producing a steady,
axisymmetric interior flow consisting of differential rotation and a two-cell
meridional circulation with radial inflow in the equatorial plane. From
previous studies, this type of flow is known to maintain a stationary
equatorial dipole by dynamo action if the magnetic Reynolds number is larger
than about 300 and if the outer boundary is electrically insulating. We vary
independently the thickness, electrical conductivity, and magnetic permeability
of the wall to determine their effect on the dynamo action. The main results
are: (a) Increasing the conductivity of the wall hinders the dynamo by allowing
eddy currents within the wall, which are induced by the relative motion of the
equatorial dipole field and the wall. This processes can be viewed as a skin
effect or, equivalently, as the tearing apart of the dipole by the differential
rotation of the wall, to which the field lines are anchored by high
conductivity. (b) Increasing the magnetic permeability of the wall favors
dynamo action by constraining the magnetic field lines in the fluid to be
normal to the wall, thereby decoupling the fluid from any induction in the
wall. (c) Decreasing the wall thickness limits the amplitude of the eddy
currents, and is therefore favorable for dynamo action, provided that the wall
is thinner than the skin depth. We explicitly demonstrate these effects of the
wall properties on the dynamo field by deriving an effective boundary condition
in the limit of vanishing wall thickness.

categories: physics.flu-dyn astro-ph.EP astro-ph.SR physics.geo-ph


title:
Diffuse phase transition and electrical properties of lead-free
  piezoelectric (LixNa1-x)NbO3 (0.04 to x to 0.20) ceramics near morphotropic
  phase boundary

abstract:
  Temperature-dependent dielectric permittivity of lead-free (LixNa1-x)NbO3 for
nominal x = 0.04-0.20, prepared by solid state reaction followed by sintering,
was studied to resolve often debated issue pertaining to exactness of
morphotropic phase boundary (MPB) location along with structural aspects and
phase stability in the system near MPB. Interestingly, a diffuse phase
transition has been observed in the dielectric permittivity peak arising from
the disorder induced in A-site and structural frustration in the perovskite
cell due to Li substitution. A partial phase diagram has been proposed based on
temperature-dependent dielectric permittivity studies. The room temperature
piezoelectric and ferroelectric properties were investigated and the ceramics
with x = 0.12 showed relatively good electrical properties (d33 = 28 pC/N, kp =
13.8%, Qm = 440, Pr = 12.5 {micro}C/cm2, EC = 43.2 kV/cm, Tm = 340 oC). These
parameter values make this material suitable for piezoelectric resonator and
filter applications. Moreover, a high dielectric permittivity (= 2703) with
broad diffuse peak near transition temperature along with low dielectric loss
(< 4%) in a wide temperature range (50-250 oC) found in this material may also
have a potential application in high-temperature multilayer capacitors in
automotive and aerospace related industries.


title:
Coulomb interaction and charge neutrality: Pariser, Parr and Pople
  Hamiltonian versus the Extended Hubbard Hamiltonian

abstract:
  The Extended Hubbard Hamiltonian used by the Condensed Matter community is
nothing but a simplified version of the Pariser, Parr and Pople Hamiltonian,
well established in the Quantum Chemistry community as a powerful tool to
describe the electronic structure of {\pi}-conjugated planar Polycyclic
Aromatic Hydrocarbons (PAH). We show that whenever the interaction potential is
non-local, unphysical charge inhomogeneities may show up in finite systems,
provided that electrons are not neutralized by the ion charges. Increasing the
system size does not solve the problem when the potential has an infinite
range, and for finite range potentials these charge inhomogeneities become
slowly less important as the potential range decreases and/or the system size
increases. Dimensionality does also play a major role. Examples in
bi-dimensional systems, such as planar PAH and graphene, are discussed to some
extent.


title:
A detailed description of the experimental realisation of quantum
  illumination protocol

abstract:
  In the last years the exploitation of specific properties of quantum states
has disclosed the possibility of realising tasks beyond classical limits,
creating the new field of quantum technologies [1, 2, 3, 4, 5, 6, 7, 8, 9].
Among them, quantum metrology and imaging aim to improve the sensitivity and/or
resolution of measurements exploiting non-classical features such as squeezing
and quantum correlations (entanglement and discordant states) [10, 11, 12, 13,
14]. Nevertheless, in most of the realistic scenarios losses and noise are
known to nullify the advantage of adopting quantum strategies [15]. In this
paper we describe in detail the first experimental realization of quantum
illumination protocol aimed to target detection in a noisy environment, that
preserves a strong advantage over the classical counterparts even in presence
of large amount of noise and losses. The experiment, inspired by the
theoretical ideas elaborated in [16, 17, 18, 19] (see also [20, 21]), has been
performed exploiting only photon number correlations in twin beams. Thus, for
its simplicity it can find widespread use. Even more important by challenging
the common believe that real application of quantum technologies is limited by
their fragility to noise and losses, it paves the way to their real
application.


title: Idempotent permutations

abstract:
  Together with a characteristic function, idempotent permutations uniquely
determine idempotent maps, as well as their linearly ordered arrangement
simultaneously. Furthermore, in-place linear time transformations are possible
between them. Hence, they may be important for succinct data structures,
information storing, sorting and searching.
  In this study, their combinatorial interpretation is given and their
application on sorting is examined. Given an array of n integer keys each in
[1,n], if it is allowed to modify the keys in the range [-n,n], idempotent
permutations make it possible to obtain linearly ordered arrangement of the
keys in O(n) time using only 4log(n) bits, setting the theoretical lower bound
of time and space complexity of sorting. If it is not allowed to modify the
keys out of the range [1,n], then n+4log(n) bits are required where n of them
is used to tag some of the keys.


title: Demkov-Kunike Models with Decay

abstract:
  Exact analytical solutions to the dissipative time-dependent Schr\"odinger
equation are obtained for a decaying two-state system with decay rates
$\Gamma_{1}$ and $\Gamma_{2}$ for levels with extremal spin projections. The
system is coherently driven with a pulse whose detuning is made up of two
parts: a time-dependent part (chirp) of hyperbolic-tangent shape and a static
part with real and imaginary terms. This gives us a wide range of possibilities
to arbitrarily select the interaction terms. We considered two versions which
led to decaying Demkov-Kunike (DK) models; the version in which the Rabi
frequency (interaction) is a time-dependent hyperbolic-secant function (called
decaying DK1 model) and the case when it is constant in time and never turns
off (decaying DK2 model). Our analytical solutions account for all possible
initial moments instead of only $t_{0}=0$ or $t_{0}=-\infty$ as for
non-decaying models and may be useful for experiments on level crossings. Two
complementary limits of the pulse detuning are considered and explored: the
limit of fast (i) and slow rise (ii). In the case (i), the coupling between
level positions in the first DK model collapses while the second DK model
reduces to a Rabi model (constant Hamiltonian), in the case (ii), both DK
models reduce to the LZ model. In both cases (i) and (ii), analytical
approximated solutions which conveniently approach the exact solutions are
derived.


title:
Nuclear Symmetry Energy: constraints from Giant Quadrupole Resonances
  and Parity Violating Electron Scattering

abstract:
  Experimental and theoretical efforts are being devoted to the study of
observables that can shed light on the properties of the nuclear symmetry
energy. We present our new results on the excitation energy [X. Roca-Maza et
al., Phys. Rev. C 87, 034301 (2013)] and polarizability of the Isovector Giant
Quadrupole Resonance (IVGQR), which has been the object of new experimental
investigation [S. S. Henshaw et al., Phys. Rev. Lett. 107, 222501 (2011)]. We
also present our theoretical analysis on the parity violating asymmetry at the
kinematics of the Lead Radius Experiment [S. Abrahamyan et al. (PREx
Collaboration), Phys. Rev. Lett. 108, 112502 (2012)] and highlight its relation
with the density dependence of the symmetry energy [X. Roca-Maza et al., Phys.
Rev. Lett. 106, 252501 (2011)].


title:
All Sky Cameras for the characterization of the Cherenkov Telescope
  Array candidate sites

abstract:
  The All Sky Camera (ASC) was developed as a universal device for the
monitoring of the night sky quality. Eight ASCs are already installed and
measure night sky parameters at eight of the candidate sites of the Cherenkov
Telescope Array (CTA) gamma-ray observatory. The ACS system consists of an
astronomical CCD camera, a fish eye lens, a control computer and associated
electronics. The measurement is carried out during astronomical night. The
images are automatically taken every 5 minutes and automatically processed
using the control computer of the device. The analysis results are the cloud
fraction (the percentage of the sky covered by clouds) and night sky brightness
(in mag/arcsec$^{2}$)


title:
On the matrix sequence $\{\Gamma(A^m)\}_{m=1}^\infty$ for a Boolean
  matrix $A$ whose digraph is linearly connected

abstract:
  In this paper, we extend the results given by Park {\em et al.} \cite{ppk} by
studying the convergence of the matrix sequence $\{\Gamma(A^m)\}_{m=1}^\infty$
for a matrix $A \in \mathcal{B}_n$ the digraph of which is linearly connected
with an arbitrary number of strong components. In the process for
generalization, we concretize ideas behind their arguments. We completely
characterize $A$ for which $\{\Gamma(A^m)\}_{m=1}^\infty$ converges. Then we
find its limit when all of the irreducible diagonal blocks are of order at
least two. We go further to characterize $A$ for which the limit of
$\{\Gamma(A^m)\}_{m=1}^\infty$ is a $J$ block diagonal matrix. All of these
results are derived by studying the $m$-step competition graph of the digraph
of $A$.


title: Boundedness of Relative Convolutions on Nilpotent Lie Groups

abstract:
  We discuss some norm estimations for integrated representations. We use the
covariant transform to extend Howe's method from the Heisenberg group to
general nilpotent Lie groups.


title:
Structural distortion in antiferromagnetic BaFe2As2 as a result of
  time-inversion symmetry

abstract:
  As reported by Q. Huang et al. [Phys. Rev. Lett. 101, 257003 (2008)], neutron
diffraction studies show an onset of antiferromagnetic order in BaFe2As2
associated with a tetragonal-to-orthorhombic distortion. We determine the group
Cmca as the space group of antiferromagnetic BaFe2As2 and identify a roughly
half-filled energy band of BaFe2As2 with Bloch functions of special symmetry as
magnetic band. As explained by the group-theoretical nonadiabatic Heisenberg
model, the electrons in this narrow band may lower their Coulomb correlation
energy by producing just the experimentally observed antiferromagnetic state if
this state does not violate group-theoretical principles. However, in
undistorted BaFe2As2 the time-inversion symmetry of the system interferes with
the stability of the antiferromagnetic state. Nevertheless, it can be
stabilized by a structural distortion of BaFe2As2 going beyond the
magnetostriction. We derive two possible structural distortions stabilizing the
antiferromagnetic state. These distortions are described by their space groups
and consist in mere displacements of the Fe atoms.


title:
Fast and precise way to calculate the posterior for the local
  non-Gaussianity parameter $f_\text{nl}$ from cosmic microwave background
  observations

abstract:
  We present an approximate calculation of the full Bayesian posterior
probability distribution for the local non-Gaussianity parameter
$f_{\text{nl}}$ from observations of cosmic microwave background anisotropies
within the framework of information field theory. The approximation that we
introduce allows us to dispense with numerically expensive sampling techniques.
We use a novel posterior validation method (DIP test) in cosmology to test the
precision of our method. It transfers inaccuracies of the calculated posterior
into deviations from a uniform distribution for a specially constructed test
quantity. For this procedure we study toy cases that use one- and
two-dimensional flat skies, as well as the full spherical sky. We find that we
are able to calculate the posterior precisely under a flat-sky approximation,
albeit not in the spherical case. We argue that this is most likely due to an
insufficient precision of the used numerical implementation of the spherical
harmonic transform, which might affect other non-Gaussianity estimators as
well. Furthermore, we present how a nonlinear reconstruction of the primordial
gravitational potential on the full spherical sky can be obtained in principle.
Using the flat-sky approximation, we find deviations for the posterior of
$f_{\text{nl}}$ from a Gaussian shape that become more significant for larger
values of the underlying true $f_{\text{nl}}$. We also perform a comparison to
the well-known estimator of Komatsu et al. [Astrophys. J. 634, 14 (2005)] and
finally derive the posterior for the local non-Gaussianity parameter
$g_{\text{nl}}$ as an example of how to extend the introduced formalism to
higher orders of non-Gaussianity.


title: In-out decomposition of boundary integral equations

abstract:
  We propose a reformulation of the boundary integral equations for the
Helmholtz equation in a domain in terms of incoming and outgoing boundary
waves. We obtain transfer operator descriptions which are exact and thus
incorporate features such as diffraction and evanescent coupling; these effects
are absent in the well known semiclassical transfer operators in the sense of
Bogomolny. It has long been established that transfer operators are equivalent
to the boundary integral approach within semiclassical approximation. Exact
treatments have been restricted to specific boundary conditions (such as
Dirichlet or Neumann). The approach we propose is independent of the boundary
conditions, and in fact allows one to decouple entirely the problem of
propagating waves across the interior from the problem of reflecting waves at
the boundary. As an application, we show how the decomposition may be used to
calculate Goos-H\"anchen shifts of ray dynamics in billiards with variable
boundary conditions and for dielectric cavities.


title:
Estimating the HF coupling parameters of the avian compass by
  comprehensively considering the available experimental results

abstract:
  Migratory birds can utilize the geomagnetic field for orientation and
navigation through a widely accepted radical-pair mechanism. Although many
theoretical works have been done the available experimental results have not
been fully considered, especially, the temporary disorientation induced by the
field which is increased by 30% of geomagnetic field and the disorientation of
the very weak resonant field of $15nT$. In this paper, we consider the
monotonicity of the singlet yield angular profile as the prerequisite of
direction sensitivity, and find that for some optimal values of the hyperfine
coupling parameters, that is the order of $10^{-7}\sim10^{-6}meV$, the
experimental results available by far can be satisfied. We also investigate the
effects of two decoherence environments and demonstrate that, in order to
satisfy the available experimental results, the decoherence rate should be much
lower than the recombination rate. Finally we investigate the effects of the
fluctuating magnetic noises, and find that the vertical noise destroys the
monotonicity of the profile completely, but the parallel noise preserves the
monotonicity perfectly and even can enhance the direction sensitivity.


title: The B-L Phase Transition: Implications for Cosmology and Neutrinos

abstract:
  We investigate the possibility that the hot thermal phase of the early
universe is ignited in consequence of the B-L phase transition, which
represents the cosmological realization of the spontaneous breaking of the
Abelian gauge symmetry associated with B-L, the difference between baryon
number B and lepton number L. Prior to the B-L phase transition, the universe
experiences a stage of hybrid inflation. Towards the end of inflation, the
false vacuum of unbroken B-L decays, which entails tachyonic preheating as well
as the production of cosmic strings. The dynamics of the B-L breaking Higgs
field and the B-L gauge degrees of freedom, in combination with thermal
processes, generate an abundance of heavy (s)neutrinos. These (s)neutrinos
decay into radiation, thereby reheating the universe, generating the baryon
asymmetry of the universe and setting the stage for the thermal production of
gravitinos. We study the B-L phase transition in the full supersymmetric
Abelian Higgs model, for which we derive and discuss the Lagrangian in
arbitrary and unitary gauge. As for the subsequent reheating process, we
formulate the complete set of Boltzmann equations, the solutions of which
enable us to give a detailed and time-resolved description of reheating.
Assuming the gravitino to be the lightest superparticle (LSP), the requirement
of consistency between hybrid inflation, leptogenesis and gravitino dark matter
implies relations between neutrino and superparticle masses, in particular a
lower bound on the gravitino mass of 10 GeV. Similarly, in the case of very
heavy gravitinos, the nonthermal production of pure wino or higgsino LSPs in
heavy gravitino decays can account for the observed amount of dark matter,
while simultaneously fulfilling the constraints imposed by primordial
nucleosynthesis and leptogenesis.


title:
Solving the Parity Problem with Rule 60 in Array Size of the Power of
  Two

abstract:
  In the parity problem, a given cellular automaton has to classify any initial
configuration into two classes according to its parity. Elementary cellular
automaton rule 60 can solve the parity problem in periodic boundary conditions
with array size of the power of two. The spectral analysis of the
configurations of rule 60 at each time step in the evolution reveals that
spatial periodicity emerges as the evolution proceeds and the patterns with
longer period split into the ones with shorter period. This phenomenon is
analogous to the cascade process in which large scale eddies split into smaller
ones in turbulence. By measuring the Lempel-Ziv complexity of configuration, we
found the stepping decrease of the complexity during the evolution. This result
might imply that a decision problem solving process is accompanied with the
decline of complexity of configuration.


title:
Diagnostics for insufficiencies of posterior calculations in Bayesian
  signal inference

abstract:
  We present an error-diagnostic validation method for posterior distributions
in Bayesian signal inference, an advancement of a previous work. It transfers
deviations from the correct posterior into characteristic deviations from a
uniform distribution of a quantity constructed for this purpose. We show that
this method is able to reveal and discriminate several kinds of numerical and
approximation errors, as well as their impact on the posterior distribution.
For this we present four typical analytical examples of posteriors with
incorrect variance, skewness, position of the maximum, or normalization. We
show further how this test can be applied to multidimensional signals.


title:
Effects of massive photons from the dark sector on the muon content in
  extensive air showers

abstract:
  Inspired by recent astrophysical observations of leptonic excesses measured
by satellite experiments, we consider the impact of some general models of the
dark sector on the muon production in extensive air showers. We present a
compact approximative expression for the bremsstrahlung of a massive photon
from an electron and use it within Monte Carlo simulations to estimate the
amount of weakly interacting photon-like massive particles that could be
produced in an extensive air shower. We find that the resulting muon production
is by many orders of magnitude below the average muon count in a shower and
thus unobservable.


title: Muon Cooling, Muon Colliders, and the MICE Experiment

abstract:
  Muon colliders and neutrino factories are attractive options for future
facilities aimed at achieving the highest lepton-antilepton collision energies
and precision measurements of parameters of the Higgs boson and the neutrino
mixing matrix. The performance and cost of these depend on how well a beam of
muons can be cooled. Recent progress in muon cooling design studies and
prototype tests nourishes the hope that such facilities can be built during the
coming decade. The status of the key technologies and their various
demonstration experiments is summarized.


title:
Polarimetry of cosmic gamma-ray sources above e+e- pair creation
  threshold

abstract:
  We examine the potential for gamma-ray conversion to electron-positron pairs,
either in the field of a nucleus or of an electron of a detector, to measure
the fraction P of linear polarization of cosmic gamma sources. For this purpose
we implement, validate and use an event generator based on the HELAS amplitude
calculator and on the SPRING event generator.
  We characterize several ways to measure P. Past proposals to increase the
polarization sensitivity by the selection of a fraction of the events in a
subset of the available phase space are found to be inefficient, due to the
loss in statistics. The use of an optimal variable that includes the full 5D
probability density function is found to improve the precision of the
measurement of P of a factor of approximately 2.
  We then study the dilution of the asymmetry that parametrize the degradation
of the precision due to experimental effects such as multiple scattering. In a
detector made with a succession of converter slabs and tracker foils, the
dependance of the dilution is found to be different from that predicted
assuming a given (the most probable) value of the pair opening angle. The
limitations of a slab detector are avoided by the use of an active target, in
which conversion and tracking are performed by the same device, in which case
the dilution of the measurement of P is found to be manageable. Based on a
realistic sizing of the detector, and for an effective exposure of 1 year, we
estimate the precision for a Crab-like source on the full energy range to be
approximately 1.4 %.


title: Higgs factories

abstract:
  Over the past two decades, the high energy physics community has been
actively discussing and developing a number of post-LHC collider projects;
however, none of them have been approved due to high costs and the uncertainty
in post-LHC physics scenarios. There have been great expectations of rich new
physics in the 0.1-1 TeV mass region: the Higgs boson (one or several),
supersymmetry, or perhaps new particles from the dark-matter family. It has
been the general consensus that the best machine for the detailed study of new
physics to be discovered at the LHC would be an energy-frontier linear e+e-
collider. Physicists held their breath waiting for the results from the LHC. In
summer 2012, two LHC detectors, ATLAS and CMS, announced the discovery of a
Higgs boson with the mass of 126 GeV and (still) nothing else. The absence of
new physics in the region below 1 TeV has changed the post-LHC collider R&D
priorities and triggered a zoo of project proposals for the precision study of
the 126 GeV Higgs boson, possibly with further upgrades to higher energies.
This paper gives an overview of these projects; it is based largely on the
reports presented at the first workshop on Higgs factories held at FNAL a few
days prior to the present workshop in Protvino.


title:
Entanglement in S states of two-electron quantum dots with Coulomb
  impurities at the center

abstract:
  We study a system of two Coulombically interacting electrons in an external
harmonic potential in the presence of an on-centre Coulomb impurity. Detailed
results for the dependencies of the reduced von Neumann entropy on the control
parameters of the system are provided for both the ground state and the triplet
S states with the lowest energy. Among other features, it is found that in the
weak confinement regime the entanglement is strongly affected by the presence
of an acceptor impurity.


title:
Propagation of UHECRs in cosmological backgrounds: some results from
  SimProp

abstract:
  Ultra-High-Energy Cosmic Ray (UHECR) nuclei propagating in cosmological
radiation backgrounds produce secondary particles detectable at Earth. SimProp
is a one dimensional code for extragalactic propagation of UHECR nuclei,
inspired by the kinetic approach of Aloisio et al. As in this approach, only a
subset of nuclei and nuclear channels are used as representative. We discuss
the validation of the code and present applications to UHECR experimental
results. In particular we present the expected fluxes of neutrinos produced in
some astrophysical scenario.


title:
A non-LTE radiative transfer model to study ionized outflows and disks.
  The case of MWC349A

abstract:
  Context. The best example of a massive star with an ionized outflow launched
from its photoevaporating disk is MWC349A. The large amount of reported
radio-continuum and radio-recombination line observations toward this galactic
UC-HII region offers a unique possibility to build a model of the ionized
envelope of this source.
  Aims. To understand the physical conditions and kinematics of the ionized
region of the circumstellar disk and also of the outflow of MWC349A.
  Methods. We compared the bulk of radio-continuum maps, radio-recombination
line profiles, and the H30alpha centroid map published to date with the
predictions of our non-LTE 3D radiative transfer model, MORELI (MOdel for
REcombination LInes), which we describe here in detail.
  Results. Our non-LTE 3D radiative transfer model provides new evidence that
the UC-HII region of MWC349A is composed of an ionized circumstellar disk
rotating in Keplerian fashion around a star of 38 solar mass, and an ionized
outflow expanding with a terminal velocity of 60 km/s and rotating in the same
sense as the disk. The model shows that while maser amplification is the
dominant process involved for Hn\alpha radio-recombination line (RRL) emission
with quantum numbers n<41, stimulated emission is relevant for the emission of
RRLs with n>41 up at least the H76alpha line.
  Conclusions. For the first time, we present a model of MWC349A which
satisfactorily explains the vast amount of reported observational data for a
very wide range of frequencies and angular resolutions.


title:
On reflectionless nature of self-consistent multi-soliton solutions in
  Bogoliubov-de Gennes and chiral Gross-Neveu models

abstract:
  Recently the most general static self-consistent multi-soliton solutions in
Bogoliubov-de Gennes and chiral Gross-Neveu systems are derived by the present
authors [D. A. Takahashi and M. Nitta, Phys. Rev. Lett. 110, 131601 (2013)].
Here we show a few complementary results, which were absent in the previous our
work. We prove directly from the gap equation that the self-consistent
solutions need to have reflectionless potentials. We also give the
self-consistent condition for the system consisting of only right-movers, which
is more used in high-energy physics.


title:
Phantom dark energy from non-local infrared modifications of General
  Relativity

abstract:
  We discuss the cosmological consequences of a model based on a non-local
infrared modification of Einstein equations. We find that the model generates a
dynamical dark energy that can account for the presently observed value of
$\Omega_{\rm DE}$, without introducing a cosmological constant. Tuning a free
mass parameter $m$ to a value $m\simeq 0.67 H_0$ we reproduce the observed
value $\Omega_{\rm DE}\simeq 0.68$. This leaves us with no free parameter and
we then get a pure prediction for the EOS parameter of dark energy. Writing
$w_{\rm DE}(a)=w_0+(1-a) w_a$, we find $w_0\simeq-1.04$ and $w_a\simeq -0.02$,
consistent with the Planck data, and on the phantom side. We also argue that
non-local equations of the type that we propose must be understood as purely
classical effective equations, such as those derived in semiclassical gravity
for the in-in matrix elements of the metric. As such, any apparent ghost
instability in such equations only affects the classical dynamics, but there is
no propagating degree of freedom associated to the ghost, and no issue of
ghost-induced quantum vacuum decay.


title:
Lyapunov exponents for particles advected in compressible random
  velocity fields at small and large Kubo numbers

abstract:
  We calculate the Lyapunov exponents describing spatial clustering of
particles advected in one- and two-dimensional random velocity fields at finite
Kubo numbers Ku (a dimensionless parameter characterising the correlation time
of the velocity field). In one dimension we obtain accurate results up to Ku ~
1 by resummation of a perturbation expansion in Ku. At large Kubo numbers we
compute the Lyapunov exponent by taking into account the fact that the
particles follow the minima of the potential function corresponding to the
velocity field. The Lyapunov exponent is always negative. In two spatial
dimensions the sign of the maximal Lyapunov exponent \lambda_1 may change,
depending upon the degree of compressibility of the flow and the Kubo number.
For small Kubo numbers we compute the first four non-vanishing terms in the
small-Ku expansion of the Lyapunov exponents. By resumming these expansions we
obtain a precise estimate of the location of the path-coalescence transition
(where \lambda_1 changes sign) for Kubo numbers up to approximately Ku = 0.5.
For large Kubo numbers we estimate the Lyapunov exponents for a partially
compressible velocity field by assuming that the particles sample those
stagnation points of the velocity field that have a negative real part of the
maximal eigenvalue of the matrix of flow-velocity gradients.


title: Exact and approximate expansions with pure Gaussian wavepackets

abstract:
  We construct frames of wavepackets produced by parabolic dilation, rotation
and translation of (a finite sum of) Gaussians and give asymptotics on the
analogue of Daubechies frame criterion. We show that the coefficients in the
corresponding approximate expansion decay fast away from the wavefront set of
the original data.


title:
Dictionary Adaptation in Sparse Recovery Based on Different Types of
  Coherence

abstract:
  In sparse recovery, the unique sparsest solution to an under-determined
system of linear equations is of main interest. This scheme is commonly
proposed to be applied to signal acquisition. In most cases, the signals are
not sparse themselves, and therefore, they need to be sparsely represented with
the help of a so-called dictionary being specific to the corresponding signal
family. The dictionaries cannot be used for optimization of the resulting
under-determined system because they are fixed by the given signal family.
However, the measurement matrix is available for optimization and can be
adapted to the dictionary. Multiple properties of the resulting linear system
have been proposed which can be used as objective functions for optimization.
This paper discusses two of them which are both related to the coherence of
vectors. One property aims for having incoherent measurements, while the other
aims for insuring the successful reconstruction. In the following, the
influences of both criteria are compared with different reconstruction
approaches.


title: Extensions of Stern's congruence for Euler numbers

abstract:
  For a nonzero integer $a$ let ${E_n^{(a)}}$ be given by
$\sum_{k=0}^{[n/2]}\binom n{2k}a^{2k}E_{n-2k}^{(a)}=(1-a)^n$ $(n=0,1,2,...)$,
where $[x]$ is the greatest integer not exceeding $x$. As $E_n^{(1)}=E_n$ is
the Euler number, $E_n^{(a)}$ can be viewed as a generalization of Euler
numbers. Let $k$ and $m$ be positive integers, and let $b$ be a nonnegative
integer. In this paper, we determine $E_{2^mk+b}^{(a)}$ modulo $ 2^{m+10}$ for
$m\ge 5$. For $m\ge 5$ we also establish congruences for
$U_{k\varphi{(5^m)}+b},\; E_{k\varphi{(5^m)}+b},\;
S_{k\varphi{(5^m)}+b}\pmod{5^{m+5}}$ and $S_{k\varphi{(3^m)}+b}\pmod{3^{m+5}},$
where $U_{2n}=E_{2n}^{(3/2)}$, $S_n=E_n^{(2)}$ and $\varphi(n)$ is Euler's
function.


title:
On harmonic morphisms from 4-manifolds to Riemann surfaces and local
  almost Hermitian structures

abstract:
  We investigate the structure of a harmonic morphism $F$ from a Riemannian
4-manifold M^4 to a 2-surface $N^2$ near a critical point $m_0$. If $m_0$ is an
isolated critical point or if $M^4$ is compact without boundary, we show that
$F$ is pseudo-holomorphic w.r.t. an almost Hermitian structure defined in a
neighbourhood of $m_0$. If $M^4$ is compact without boundary, the singular
fibres of $F$ are branched minimal surfaces.


title: Incidence of Strong MgII Absorbers Towards Different Types of Quasars

abstract:
  We report the first comparative study of strong MgII absorbers seen towards
radio-loud quasars of core-dominated (CDQs) and lobe-dominated (LDQs) types and
normal QSOs. The MgII associated absorption systems having a velocity offset v
< 5000km/s from the systemic velocity of the background quasar were also
excluded. Existing spectroscopic data for redshift-matched sightlines of 3975
CDQs and 1583 LDQs, covering a emission redshift range 0.39-4.87, were analysed
and 864 strong MgII absorbers were found, covering the redshift range
0.45-2.17. The conclusions reached using this well-defined large dataset of
strong MgII absorbers are: (i) The number density, dN/dz, towards CDQs shows a
small, marginally significant excess over the estimate available for QSOs; (ii)
In the redshift space, this difference is reflected in terms of a 1.6sigma
excess of dN/dz over the QSOs, within the narrow redshift interval 1.2-1.8;
(iii) The dN/dbeta distribution (with beta=v/c) for CDQs shows a significant
excess over the distribution found for a redshift and luminosity matched sample
of QSOs, at beta in the range 0.05-0.1. This leads us to infer that a
significant fraction of strong MgII absorption systems seen in this offset
velocity range are probably associated with the CDQs and might be accelerated
into the line of sight by their powerful jets and/or due to the accretion-disk
outflows close to our direction. Support to this scenario comes from a
consistency check in which we only consider the spectral range corresponding to
beta > 0.2. The computed redshift distribution for strong MgII absorbers
towards CDQs now shows excellent agreement with that known for QSOs, as indeed
is expected for purely intervening absorption systems. Thus, it appears that
for CDQs the associated strong MgII absorbers can be seen at much larger
velocities relative to the nucleus than the commonly adopted upper limit of
5000km/s.


title: Diffuse interstellar bands in (proto-) fullerene-rich environments

abstract:
  The recent infrared detection of fullerenes (C60 and C70) in Planetary
Nebulae (PNe) and R Coronae Borealis (RCB) stars offers a beautiful opportunity
for studying the diffuse interstellar bands (DIBs) in sources where fullerenes
are abundant. Here we present for the first time a detailed inspection of the
optical spectra of the hot RCB star DY Cen and two fullerene PNe (Tc 1 and M
1-20), which permits us to directly explore the fullerenes - DIB connection.
The DIB spectrum of DY Cen (Garcia-Hernandez et al. 2012a) is remarkably
different from that in fullerene PNe (Garcia-Hernandez & Diaz-Luis 2013). In
particular, Tc 1 displays unusually strong 4428 A and 6309 A DIBs, which are
normal (or not seen) in DY Cen. On the other hand, DY Cen displays an unusually
strong 6284 A DIB that is found to be normal in fullerene PNe. We also report
the detection of new broad and unidentified features centered at 4000 A and
6525 A in DY Cen and Tc 1, respectively. We suggest that the new 4000 A band
seen in DY Cen may be related to the circumstellar proto-fullerenes seen at
infrared wavelengths (Garcia-Hernandez et al. 2012a). However, the intense 4428
A DIB (probably also the 6309 A DIB and the new 6525 A band) may be related to
the presence of larger fullerenes (e.g., C80, C240, C320, and C540) and
buckyonions (multishell fullerenes such as C60@C240 and C60@C240@C540) in the
circumstellar envelope of Tc 1 (Garcia-Hernandez & Diaz-Luis 2013).


title: On a formula of T. Rivoal

abstract:
  In an unpublished 2005 paper T. Rivoal proved a formula giving 4/pi as the
infinite product of factors (1 + 1/(k+1)) to a power involving the integer part
of the logarithm of k in base 2 and a 4-periodic sequence. We show how a lemma
in a 1988 paper of J. Shallit and the author allows us to prove that formula,
as well as a family of similar formulas involving occurrences of blocks of
digits in the base-B expansion of the integer k, where B is an integer larger
than 1.


title:
Optimization of the Orbiting Wide-angle Light Collectors (OWL) Mission
  for Charged-Particle and Neutrino Astronomy

abstract:
  OWL uses the Earth's atmosphere as a vast calorimeter to fully enable the
emerging field of charged-particle astronomy with high-statistics measurements
of ultra-high-energy cosmic rays (UHECR) and a search for sources of UHE
neutrinos and photons. Confirmation of the Greisen-Zatsepin-Kuzmin (GZK)
suppression above ~4 x 10^19 eV suggests that most UHECR originate in
astrophysical objects. Higher energy particles must come from sources within
about 100 Mpc and are deflected by ~1 degree by predicted
intergalactic/galactic magnetic fields. The Pierre Auger Array, Telescope Array
and the future JEM-EUSO ISS mission will open charged-particle astronomy, but
much greater exposure will be required to fully identify and measure the
spectra of individual sources. OWL uses two large telescopes with 3 m optical
apertures and 45 degree FOV in near-equatorial orbits. Simulations of a
five-year OWL mission indicate ~10^6 km^2 sr yr of exposure with full aperture
at ~6 x 10^19 eV. Observations at different altitudes and spacecraft
separations optimize sensitivity to UHECRs and neutrinos. OWL's stereo event
reconstruction is nearly independent of track inclination and very tolerant of
atmospheric conditions. An optional monocular mode gives increased reliability
and can increase the instantaneous aperture. OWL can fully reconstruct
horizontal and upward-moving showers and so has high sensitivity to UHE
neutrinos. New capabilities in inflatable structures optics and silicon
photomultipliers can greatly increase photon sensitivity, reducing the energy
threshold for neutrino detection or increasing viewed area using a higher
orbit. Design trades between the original and optimized OWL missions and the
enhanced science capabilities are described.


title:
Configurations of Bounded and Free-floating Planets in Very Young Open
  Clusters

abstract:
  Open clusters(OCs) are usually young and suitable for studying the formation
and evolution of planetary systems. Hitherto, only four planets have been found
with radial velocity measurements in OCs. Meanwhile, a lot of free-floating
planets(FFPs) have been detected. We utilize N-body simulations to investigate
the evolution and final configurations of multi-planetary systems in very young
open clusters with an age <10 Myr. After an evolution of 10 Myr, 61%-72% of the
planets remain bounded and more than 55% of the planetary systems will maintain
their initial orbital configurations. For systems with one planet ejected, more
than 25% of them have the surviving planets in misaligned orbits. In the
clusters, the fraction of planetary systems with misalignment is > 6%, and only
1% have planets in retrograde orbits. We also obtain a positive correlation
between the survival planet number and the distance from the cluster center
$r$: planetary systems with a larger $r$ tend to be more stable. Moreover,
stars with a mass >2.5 $M_\odot$ are likely unstable and lose their planets.
These results are roughly consistent with current observations. Planetary
systems in binaries are less stable and we achieve a rough criterion: most of
the binary systems with $a_{\rm b}(1-e_{\rm b}^2)$>100 AU can keep all the
initial planets survived. Finally, 80% of the FFPs are ejected out of the
clusters, while the rest (~20%) still stay in host clusters and most of them
are concentrated in the center (<2 pc).


title: Structure constants of $\beta$ deformed super Yang-Mills

abstract:
  We study the structure constants of the ${\cal N}=1$ beta deformed theory
perturbatively and at strong coupling. We show that the planar one loop
corrections to the structure constants of single trace gauge invariant
operators in the scalar sector is determined by the anomalous dimension
Hamiltonian. This result implies that 3 point functions of the chiral primaries
of the theory do not receive corrections at one loop. We then study the
structure constants at strong coupling using the Lunin-Maldacena geometry. We
explicitly construct the supergravity mode dual to the chiral primary with
three equal U(1) R-charges in the Lunin-Maldacena geometry. We show that the 3
point function of this supergravity mode with semi-classical states
representing two other similar chiral primary states but with large U(1)
charges to be independent of the beta deformation and identical to that found
in the $AdS_5\times S^5$ geometry. This together with the one-loop result
indicate that these structure constants are protected by a non-renormalization
theorem. We also show that three point function of U(1) R-currents with
classical massive strings is proportional to the R-charge carried by the string
solution. This is in accordance with the prediction of the R-symmetry Ward
identity.


title:
Simultaneous EUV and Radio Observations of Bidirectional Plasmoids
  Ejection During Magnetic Reconnection

abstract:
  We present a multiwavelength study of the X-class flare, which occurred in
active region (AR) NOAA 11339 on 3 November 2011. The EUV images recorded by
SDO/AIA show the activation of a remote filament (located north of the AR) with
footpoint brightenings about 50 min prior to the flare occurrence. The kinked
filament rises-up slowly and after reaching a projected height of ~49 Mm, it
bends and falls freely near the AR, where the X-class flare was triggered.
Dynamic radio spectrum from the Green Bank Solar Radio Burst Spectrometer
(GBSRBS) shows simultaneous detection of both positive and negative drifting
pulsating structures (DPSs) in the decimetric radio frequencies (500-1200 MHz)
during the impulsive phase of the flare. The global negative DPSs in solar
flares are generally interpreted as a signature of electron acceleration
related to the upward moving plasmoids in the solar corona. The EUV images from
AIA 94 \AA reveal the ejection of multiple plasmoids, which move simultaneously
upward and downward in the corona during the magnetic reconnection. The
estimated speeds of the upward and downward moving plasmoids are ~152-362 and
~83-254 km/s, respectively. These observations strongly support the recent
numerical simulations of the formation and interaction of multiple plasmoids
due to tearing of the current-sheet structure. On the basis of our analysis, we
suggest that the simultaneous detection of both the negative and positive DPSs
is most likely generated by the interaction/coalescence of the multiple
plasmoids moving upward and downward along the current-sheet structure during
the magnetic reconnection process. Moreover, the differential emission measure
(DEM) analysis of the active region reveals presence of a hot flux-rope
structure (visible in AIA 131 and 94 \AA) prior to the flare initiation and
ejection of the multi-temperature plasmoids during the flare impulsive phase.


title: The Effects of Technology and Innovation on Society

abstract:
  Various models of the information society have been developed so far and they
are so different from country to country that it would be rather unwise to look
for a single, allencompassing definition. In our time a number of profound
socioeconomic changes are underway. The application of these theories and
schools on ICT is problematic in many respects. First, as we stated above,
there is not a single, widely used paradigm which has synthesised the various
schools and theories dealing with technology and society. Second, these
fragmented approaches do not have a fully fledged mode of application to the
relationship of ICT and (information) society. Third, SCOT, ANT, the
evolutionary or the systems approach to the history of technology when dealing
with information society does not take into account the results of approaches
studying the very essence of the information age: information, communication
and knowledge. The list of unnoticed or partially incorporated sciences, which
focuses on the role of ICT in human information processing and other cognitive
activities, is much longer.


title:
The Non-Imaging CHErenkov Array (NICHE): A TA/TALE Extension to Measure
  the Flux and Composition of Very-High Energy Cosmic Rays

abstract:
  Co-sited with TA/TALE, the Non-Imaging CHErenkov Array (NICHE) will measure
the flux and nuclear composition of cosmic rays from below 10^16 eV to 10^18 eV
in its initial deployment. Furthermore, the low-energy threshold can be
significantly decreased below the cosmic ray knee via counter redeployment or
by including additional counters. NICHE uses easily deployable detectors to
measure the amplitude and time-spread of the air-shower Cherenkov signal to
achieve an event-by-event measurement of Xmax and energy, each with excellent
resolution. NICHE will have sufficient area and angular acceptance to have
significant overlap with the TA/TALE detectors to allow for energy
cross-calibration. Simulated NICHE performance has shown that the array has the
ability to distinguish between several different composition models as well as
measure the end of Galactic cosmic ray spectrum.


title: Pebble Games, Proof Complexity, and Time-Space Trade-offs

abstract:
  Pebble games were extensively studied in the 1970s and 1980s in a number of
different contexts. The last decade has seen a revival of interest in pebble
games coming from the field of proof complexity. Pebbling has proven to be a
useful tool for studying resolution-based proof systems when comparing the
strength of different subsystems, showing bounds on proof space, and
establishing size-space trade-offs. This is a survey of research in proof
complexity drawing on results and tools from pebbling, with a focus on proof
space lower bounds and trade-offs between proof size and proof space.


title: Present status and future perspectives of the NEXT experiment

abstract:
  NEXT is an experiment dedicated to neutrinoless double beta decay searches in
xenon. The detector is a TPC, holding 100 kg of high-pressure xenon enriched in
the $^{136}$Xe isotope. It is under construction in the Laboratorio
Subterr\'aneo de Canfranc in Spain, and it will begin operations in 2015. The
NEXT detector concept provides an energy resolution better than 1% FWHM and a
topological signal that can be used to reduce the background. Furthermore, the
NEXT technology can be extrapolated to a 1-ton scale experiment.


title: Limitation on the luminosity of e+e- storage rings due to beamstrahlung

abstract:
  Particle loss due to the emission of single energetic beamstrahlung photons
in beam collisions is shown to impose a fundamental limit on storage-ring
luminosities at energies greater than 2E~140 GeV for head-on collisions and
2E~40 GeV for crab-waist collisions. Above these threshold energies, the
suppression factor due to beamstrahlung scales as 1/E^{4/3}, and for a fixed
power of synchrotron radiation, the luminosity L is proportional to R/E^{13/3},
where R is the collider radius. For 2E > 150 GeV, both collision schemes have
similar luminosity limits. The luminosities attainable at storage-ring and
linear-collider (LC) 2E=240 GeV Higgs factories are comparable; at higher
energies, LCs are preferable. This conference paper is based on my recent PRL
publication [1], supplemented with additional comments on linac-ring e+e-
colliders and ring e+e- colliders with charge compensation (four-beam
collisions).


title:
Eigenvalue decay of positive integral operators on compact two-point
  homogeneous spaces

abstract:
  We generalize and extend results on decay rates of singular values or
eigenvalues of positive integral operators from unit spheres to two-point
homogeneous spaces. The rates we present depend upon the order of the
Laplace-Beltrami operator used to define the smoothness conditions on
generating kernels, the Schatten class containing the integral operator
generated by the derivative of the generating kernel and the dimension of the
space.


title:
Simple vibration insensitive cavity for laser stabilization at the
  10^{-16} level

abstract:
  We present the design and realization of two reference cavities for
ultra-stable lasers addressing narrow transitions in mixed-species (In+ / Yb+)
Coulomb crystals. With a simple setup, we achieve a fractional frequency
instability close to the thermal noise limit of a 12 cm long cavity, reaching
4.7 * 10^{-16} at 10 s with a linear drift of 53 mHz/s. We discuss the
individual instability contributions and show that in a setup with a lower
thermal noise floor and vibration sensitivity, an instability of 1 * 10^{-16}
can be reached. To achieve this, we implement a vibration insensitive design
for a 30 cm long cavity mounted horizontally and conduct first tests that show
a sensitivity of 1.8 * 10^{-11} / ms^{-2} to vertical accelerations. This is
about a factor of 20 less than the value observed for the short cavity.
Mechanical tolerances and ways to further reduce the sensitivity are discussed.


title:
The modeling of the nuclear composition measurement performance of the
  Non-Imaging CHErenkov Array (NICHE)

abstract:
  In its initial deployment, the Non-Imaging CHErenkov Array (NICHE)will
measure the flux and nuclear composition of cosmic rays from below 10^16 eV to
10^18 eV by using measurements of the amplitude and time-spread of the
air-shower Cherenkov signal to achieve a robust event-by-event measurement of
Xmax and energy. NICHE will have sufficient area and angular acceptance to have
significant overlap with TA/TALE, within which NICHE is located, to allow for
energy cross-calibration. In order to quantify NICHE's ability to measure the
cosmic ray nuclear composition, 4-component composition models were constructed
based upon a poly-gonato model of J. Hoerandel using simulated Xmax
distributions of the composite composition as a function of energy. These
composition distributions were then unfolded into individual components via an
analysis technique that included NICHE's simulated Xmax and energy resolution
performance as a function of energy as well as the effects of finite event
statistics. Details of the construction of the 4-component composition models
and NICHE's ability to determine the individual components as a function of
energy are presented.