title: The Vlasov-Poisson-Boltzmann system without angular cutoff

abstract:
  This paper is concerned with the Vlasov-Poisson-Boltzmann system for plasma
particles of two species in three space dimensions. The Boltzmann collision
kernel is assumed to be angular non-cutoff with $-3<\gamma<-2s$ and $1/2\leq
s<1$, where $\gamma$, $s$ are two parameters describing the kinetic and angular
singularities, respectively. We establish the global existence and convergence
rates of classical solutions to the Cauchy problem when initial data is near
Maxwellians. This extends the results in \cite{DYZ-h, DYZ-s} for the cutoff
kernel with $-2\leq \gamma\leq 1$ to the case $-3<\gamma<-2$ as long as the
angular singularity exists instead and is strong enough, i.e., $s$ is close to
1. The proof is based on the time-weighted energy method building also upon the
recent studies of the non cutoff Boltzmann equation in \cite{GR} and the
Vlasov-Poisson-Landau system in \cite{Guo5}.


title:
Global well-posedness in spatially critical Besov space for the
  Boltzmann equation

abstract:
  The unique global strong solution in the Chemin-Lerner type space to the
Cauchy problem on the Boltzmann equation for hard potentials is constructed in
perturbation framework. Such solution space is of critical regularity with
respect to spatial variable, and it can capture the intrinsic property of the
Botlzmann equation. For the proof of global well-posedness, we develop some new
estimates on the nonlinear collision term through the Littlewood-Paley theory.


title: The asymptotic $k$-SAT threshold

abstract:
  Since the early 2000s physicists have developed an ingenious but non-rigorous
formalism called the cavity method to put forward precise conjectures on phase
transitions in random problems [Mezard, Parisi, Zecchina: Science 2002]. The
cavity method predicts that the satisfiability threshold in the random $k$-SAT
problem is $2^k\ln2-\frac12(1+\ln 2)+\epsilon_k$, with
$\lim_{k\rightarrow\infty}\epsilon_k=0$ [Mertens, Mezard, Zecchina: Random
Structures and Algorithms 2006]. This paper contains a proof of that
conjecture.


title: Monogamy inequalities for the EPR paradox and quantum steering

abstract:
  Monogamy inequalities for the way bipartite EPR steering can be distributed
among N systems are derived. One set of inequalities is based on witnesses with
two measurement settings, and may be used to demonstrate correlation of
outcomes between two parties, that cannot be shared with more parties. It is
shown that the monogamy for steering is directional. Two parties cannot
independently demonstrate steering of a third system, using the same
two-setting steering witness, but it is possible for one party to steer two
independent systems. This result explains the monogamy of two-setting Bell
inequality violations, and the sensitivity of the continuous variable (CV) EPR
criterion to losses on the steering party. We generalise to m settings. A
second type of monogamy relation gives the quantitative amount of sharing
possible, when the number of parties is less than or equal to m, and takes a
form similar to the Coffman-Kundu-Wootters (CKW) relation for entanglement. The
results enable characterisation of the tripartite steering for CV Gaussian
systems and qubit GHZ and W states.


title: PACS photometer calibration block analysis

abstract:
  The absolute stability of the PACS bolometer response over the entire mission
lifetime without applying any corrections is about 0.5% (standard deviation) or
about 8% peak-to-peak. This fantastic stability allows us to calibrate all
scientific measurements by a fixed and time-independent response file, without
using any information from the PACS internal calibration sources. However, the
analysis of calibration block observations revealed clear correlations of the
internal source signals with the evaporator temperature and a signal drift
during the first half hour after the cooler recycling. These effects are small,
but can be seen in repeated measurements of standard stars. From our analysis
we established corrections for both effects which push the stability of the
PACS bolometer response to about 0.2% (stdev) or 2% in the blue, 3% in the
green and 5% in the red channel (peak-to-peak). After both corrections we still
see a correlation of the signals with PACS FPU temperatures, possibly caused by
parasitic heat influences via the Kevlar wires which connect the bolometers
with the PACS Focal Plane Unit. No aging effect or degradation of the
photometric system during the mission lifetime has been found.


title:
Two Fermi surface states and two $T_{\rm c}$-rising mechanisms revealed
  by transport properties in $R$FeP$_{1-x}$As$_x$O$_{0.9}$F$_{0.1}$ ($R$=La, Pr
  and Nd)

abstract:
  We demonstrate the relation between critical temperature $T_{\rm c}$ and
transport properties in $R$FeP$_{1-x}$As$_x$O$_{0.9}$F$_{0.1}$ ($R$=La, Pr and
Nd). $T_{\rm c}$ and resistivity power-law exponent $n$ form a universal line
on the $T_{\rm c}$ vs. $n$ plane for all the $R$-systems with $x$$<0.6\sim$0.8,
indicating that $T_{\rm c}$ increases with bosonic fluctuation. Transport
properties show anomalies suggesting a change of Fermi surfaces around
$x$=0.6$\sim$0.8. Above $x$=0.6$\sim$0.8, $T_{\rm c}$ and $n$ approach the
second $T_{\rm c}$-$n$ line for the higher $T_{\rm c}$ systems. A further
increase of $T_{\rm c}$ above $x$=0.6$\sim$0.8 indicates the presence of an
additional $T_{\rm c}$-rising mechanism in this system.


title:
Finite-element based electromagnetic field simulations: Benchmark
  results for isolated structures

abstract:
  We use a finite-element method to obtain highly converged results for a
nano-optical light scattering setup with a non-periodic geometry.


title:
Statistical handling of reproduction data for exposure-response
  modelling

abstract:
  Reproduction data collected through standard bioassays are classically
analyzed by regression in order to fit exposure-response curves and estimate
ECx values (x% Effective Concentration). But regression is often misused on
such data, ignoring statistical issues related to i) the special nature of
reproduction data (count data), ii) a potential inter-replicate variability and
iii) a possible concomitant mortality. This paper offers new insights in
dealing with those issues. Concerning mortality, particular attention was paid
not to waste any valuable data - by dropping all the replicates with mortality
- or to bias ECx values. For that purpose we defined a new covariate summing
the observation periods during which each individual contributes to the
reproduction process. This covariate was then used to quantify reproduction -
for each replicate at each concentration - as a number of offspring per
individual-day. We formulated three exposure-response models differing by their
stochastic part. Those models were fitted to four datasets and compared using a
Bayesian framework. The individual-day unit proved to be a suitable approach to
use all the available data and prevent bias in the estimation of ECx values.
Furthermore, a non-classical negative-binomial model was shown to correctly
describe the inter-replicate variability observed in the studied datasets.


title:
B(E2) value of even-even 108-112Pd isotopes by interacting boson
  model-1*

abstract:
  This work studies the systematic reduced transition probabilities B(E2),
intrinsic quadrupole moments and deformation parameters of Pd isotopes with
even neutrons from N= 62 to 66. The downward reduced transition probabilities
B(E2) from gamma transition 8+ to 6+, 6+ to 4+, 4+ to 2+ and 2+ to 0+ states of
even-even 108-112Pd isotopes were calculated by the Interacting Boson Model
(IBM-1) and compared with the available previous experimental results. The
ratio of the excitation energies of the first 4+ and the first 2+ excited
states, R4/2, is also studied for the classification of symmetry of these
nuclei. Furthermore we have studied systematically the transition rate R of
some of the low-lying quadrupole collective states in comparison with the
available experimental data. The associated quadrupole moments and deformation
parameters have been calculated. The results of this calculation are in good
agreement with the corresponding available experimental data. The 108-112Pd
isotopes show the O(6) symmetry.


title:
Relations between Witten-reshetikhin-turaev and non semi-simple sl(2)
  3-manifold invariants

abstract:
  The Witten-Reshetikhin-Turaev invariants extend the Jones polynomials of
links in S^3 to invariants of links in 3-manifolds. Similarly, in a preceding
paper, the authors constructed two 3-manifold invariants N_r and N^0_r which
extend the Akutsu-Deguchi-Ohtsuki invariant of links in S^3 colored by complex
numbers to links in arbitrary manifolds. All these invariants are based on
representation theory of the quantum group Uqsl2, where the definition of the
invariants N_r and N^0_r uses a non-standard category of Uqsl2-modules which is
not semi-simple. In this paper we study the second invariant N^0_r and consider
its relationship with the WRT invariants. In particular, we show that the ADO
invariant of a knot in S^3 is a meromorphic function of its color and we
provide a strong relation between its residues and the colored Jones
polynomials of the knot. Then we conjecture a similar relation between N^0_r
and a WRT invariant. We prove this conjecture when the 3-manifold M is not a
rational homology sphere and when M is a rational homology sphere obtained by
surgery on a knot in S^3 or when M is a connected sum of such manifolds.


title:
Tensor Product Approximation (DMRG) and Coupled Cluster method in
  Quantum Chemistry

abstract:
  We present the Copupled Cluster (CC) method and the Density matrix
Renormalization Grooup (DMRG) method in a unified way, from the perspective of
recent developments in tensor product approximation. We present an introduction
into recently developed hierarchical tensor representations, in particular
tensor trains which are matrix product states in physics language. The discrete
equations of full CI approximation applied to the electronic Schr\"odinger
equation is casted into a tensorial framework in form of the second
quantization. A further approximation is performed afterwards by tensor
approximation within a hierarchical format or equivalently a tree tensor
network. We establish the (differential) geometry of low rank hierarchical
tensors and apply the Driac Frenkel principle to reduce the original
high-dimensional problem to low dimensions. The DMRG algorithm is established
as an optimization method in this format with alternating directional search.
We briefly introduce the CC method and refer to our theoretical results. We
compare this approach in the present discrete formulation with the CC method
and its underlying exponential parametrization.

categories: physics.chem-ph cond-mat.str-el math-ph math.MP


title: Quantum measurement and thermally assisted proton tunnelling

abstract:
  Despite compelling evidence to the contrary in recent years, the view still
persists that quantum effects cannot survive very long within a warm, noisy and
complex environment that washes out quantum effects at timescales far too short
for any chemically or biochemically interesting processes. It is also assumed
that as the temperature of the surrounding environment increases, so the
efficiency of processes such as quantum tunnelling drops. One way of viewing
this has been to invoke the quantum Zeno effect: that the watched pot never
boils. In this work we show that the opposite is true. For a quite general open
quantum system, a proton in an asymmetric double-well potential, the action of
the environment is to enhance the tunnelling rate (an anti-Zeno effect). We
compare two simple mathematical models to show that, over a specific
temperature range, thermally enhanced quantum tunnelling is equivalent to
increasing the frequency of a von Neumann-type measurement by the environment
on the system.


title:
A Dacorogna-Moser approach to flow decomposition and minimal flow
  problems

abstract:
  The papers describes an easy approach, based on a classical construction by
Dacorogna and Moser, to prove that optimal vector fields in some minimal flow
problem linked to optimal transport models (congested traffic, branched
transport, Beckmann's problem...) are induced by a probability measure on the
space of paths. This gives a new, easier, proof of a classical result by
Smirnov, and allows handling optimal flows without taking care of the presence
of cycles.


title:
Effect of retardation in the atom-field interaction on entanglement in a
  double Jaynes-Cummings system

abstract:
  The effect of retardation in the atom-field interaction on the dynamics of
entanglement in a double Jaynes-Cummings system is investigated. We consider
large cavities in which a finite time necessary for light to travel between the
atoms and the cavity mirrors may result in retardation effects. Our results
demonstrate the qualitatively new behaviour observable in the time evolution of
entanglement when the retardation effects are included. Solutions for single
and double excitation in the system are presented. We follow the temporal
evolution of an initial entanglement and find that the evolution is affected
drastically by the retardation effects. In particular, the harmonic
oscillations of the atomic populations and the concurrence, characteristic of
single-mode Jaynes-Cummings systems, are suppressed when the retardation
effects are included. The process of revival of the entanglement degrades with
an increasing number of the cavity modes to which the atoms are coupled. It is
also found that the effect of the retardation on the doubly excited states is
more drastic than on the single excitation states that at relatively short
times, the retardation leads to a complete distortion of entanglement carried
by a doubly excited state.


title: Bowen's entropy-conjugacy conjecture is true up to finite index

abstract:
  For a topological dynamical system consisting of a continuous map f, and a
(not necessarily compact) subset Z of X, Bowen (1973) defined a dimension-like
version of entropy, h_X(f,Z). In the same work, he introduced a notion of
entropy-conjugacy for pairs of invertible compact systems: the systems (X,f)
and (Y,g) are entropy-conjugate if there exist invariant Borel subsets X' of X
and Y' of Y such that h_X(f,X\setminus X') < h_X(f,X), h_Y(g,Y \setminus Y') <
h_Y(g,Y), and (X',f|_{X'}) is topologically conjugate to (Y',g|_{Y'}). Bowen
conjectured that two mixing shifts of finite type are entropy-conjugate if they
have the same entropy. We prove that two mixing shifts of finite type with
equal entropy and left ideal class are entropy-conjugate. Consequently, in
every entropy class Bowen's conjecture is true up to finite index.


title: Waterfall: Primitives Generation on the Fly

abstract:
  Modern languages are typically supported by managed runtimes (Virtual
Machines). Since VMs have to deal with many concepts such as memory management,
abstract execution model and scheduling, they tend to be very complex.
Additionally, VMs have to meet strong performance requirements. This demand of
performance is one of the main reasons why many VMs are built statically. Thus,
design decisions are frozen at compile time preventing changes at runtime. One
clear example is the impossibility to dynamically adapt or change primitives of
the VM once it has been compiled. In this work we present a toolchain that
allows for altering and configuring components such as primitives and plug-ins
at runtime. The main contribution is Waterfall, a dynamic and reflective
translator from Slang, a restricted subset of Smalltalk, to native code.
Waterfall generates primitives on demand and executes them on the fly. We
validate our approach by implementing dynamic primitive modification and
runtime customization of VM plug-ins.


title:
On a voltage-conductance kinetic system for integrate and fire neural
  networks

abstract:
  The voltage-conductance kinetic equation for integrate and fire neurons has
been used in neurosciences since a decade and describes the probability density
of neurons in a network. It is used when slow conductance receptors are
activated and noticeable applications to the visual cortex have been
worked-out. In the simplest case, the derivation also uses the assumption of
fully excitatory and moderately all-to-all coupled networks; this is the
situation we consider here. We study properties of solutions of the kinetic
equation for steady states and time evolution and we prove several global a
priori bounds both on the probability density and the firing rate of the
network. The main difficulties are related to the degeneracy of the diffusion
resulting from noise and to the quadratic aspect of the nonlinearity. This
result constitutes a paradox; the solutions of the kinetic model, of partially
hyperbolic nature, are globally bounded but it has been proved that the fully
parabolic integrate and fire equation (some kind of diffusion limit of the
former) blows-up in finite time.


title: Case Adaptation with Qualitative Algebras

abstract:
  This paper proposes an approach for the adaptation of spatial or temporal
cases in a case-based reasoning system. Qualitative algebras are used as
spatial and temporal knowledge representation languages. The intuition behind
this adaptation approach is to apply a substitution and then repair potential
inconsistencies, thanks to belief revision on qualitative algebras. A temporal
example from the cooking domain is given. (The paper on which this extended
abstract is based was the recipient of the best paper award of the 2012
International Conference on Case-Based Reasoning.)


title: A good mass proxy for galaxy clusters with XMM-Newton

abstract:
  We use a sample of 39 galaxy clusters at redshift z < 0.1 observed by
XMM-Newton to investigate the relations between X-ray observables and total
mass. Based on central cooling time and central temperature drop, the clusters
in this sample are divided into two groups: 25 cool core clusters and 14
non-cool core clusters, respectively. We study the scaling relations of
Lbol-M500, M500-T, M500-Mg and M500-YX, and also the influences of cool core on
these relations. The results show that the M500-YX relation has a slope close
to the standard self-similar value, has the smallest scatter and does not vary
with the cluster sample. Moreover, the M500-YX relation is not affected by the
cool core. Thus, the parameter of YX may be the best mass indicator.


title: Testing Graph Isotopy on Surfaces

abstract:
  We investigate the following problem: Given two embeddings G_1 and G_2 of the
same abstract graph G on an orientable surface S, decide whether G_1 and G_2
are isotopic; in other words, whether there exists a continuous family of
embeddings between G_1 and G_2. We provide efficient algorithms to solve this
problem in two models. In the first model, the input consists of the
arrangement of G_1 (resp., G_2) with a fixed graph cellularly embedded on S;
our algorithm is linear in the input complexity, and thus, optimal. In the
second model, G_1 and G_2 are piecewise-linear embeddings in the plane minus a
finite set of points; our algorithm runs in O(n^{3/2}\log n) time, where n is
the complexity of the input. The graph isotopy problem is a natural variation
of the homotopy problem for closed curves on surfaces and on the punctured
plane, for which algorithms have been given by various authors; we use some of
these algorithms as a subroutine. As a by-product, we reprove the following
mathematical characterization, first observed by Ladegaillerie (1984): Two
graph embeddings are isotopic if and only if they are homotopic and congruent
by an oriented homeomorphism.


title:
Spin-Driven Bond Order in a 1/5-Magnetization Plateau Phase in a
  Triangular Lattice Antiferromagnet CuFeO2

abstract:
  We have investigated spin-wave excitations in a magnetic-field-induced
1/5-magnetization plateau phase in a triangular lattice antiferromagnet CuFeO2
(CFO), by means of inelastic neutron scattering measurements under applied
magnetic fields of up to 13.4 T. Comparing the observed spectra with the
calculations in which spin-lattice coupling effects for the nearest neighbor
exchange interactions are taken into account, we have determined the
Hamiltonian parameters in the field-induced 1/5- plateau phase, which directly
show that CFO exhibits a bond order associated with the magnetic structure in
this phase.


title: On Bogomolny-Schmit conjecture

abstract:
  Bogomolny and Schmit proposed that the critical edge percolation on the
square lattice is a good model for the nodal domains of a random plane wave.
Based on this they made a conjecture about the number of nodal domains. Recent
computer experiments showed that the mean number of clusters per vertex and the
mean number of nodal domains per unit area are very close but different. Since
the original argument was mostly supported by numerics, it was believed that
the percolation model is wrong. In this paper we give some numerical evidence
in favour of the percolation model.


title: Multi-Source Multi-Path HTTP (mHTTP): A Proposal

abstract:
  Today, most devices have multiple network interfaces. Coupled with
wide-spread replication of popular content at multiple locations, this provides
substantial path diversity in the Internet. We propose Multi-source Multipath
HTTP, mHTTP, which takes advantage of all existing types of path diversity in
the Internet. mHTTP needs only client-side but not server-side or network
modifications as it is a receiver-oriented mechanism. Moreover, the
modifications are restricted to the socket interface. Thus, no changes are
needed to the applications or to the kernel.
  As mHTTP relies on HTTP range requests, it is specific to HTTP which accounts
for more than 60% of the Internet traffic. We implement mHTTP and study its
performance by conducting measurements over a testbed and in the wild. Our
results show that mHTTP indeed takes advantage of all types of path diversity
in the Internet, and that it is a viable alternative to Multipath TCP for HTTP
traffic. mHTTP decreases download times for large objects up to 50%, whereas it
does no harm to small object downloads.


title: Notes on the numerical solution of the Benjamin equation

abstract:
  In this paper we consider the Benjamin equation, a partial differential
equation that models one-way propagation of long internal waves of small
amplitude along the interface of two fluid layers under the effects of gravity
and surface tension. We solve the periodic initial-value problem for the
Benjamin equation numerically by a new fully discrete hybrid finite-element /
spectral scheme, which we first validate by pinning down its accuracy and
stability properties. After testing the evolution properties of the scheme in a
study of propagation of single - and multi-pulse solitary waves of the Benjamin
equation, we use it in an exploratory mode to illuminate phenomena such as
overtaking collisions of solitary waves, and the stability of single-,
multi-pulse and 'depression' solitary waves.


title: Field theoretical prediction of a property of the tropical cyclone

abstract:
  The large scale atmospheric vortices (tropical cyclones, tornadoes) are
complex physical systems combining thermodynamics and fluid-mechanical
processes. The well known tendency of vorticity to self-organization, an
universal property of the two-dimensional fluids, is part of the full dynamics,
but its description requires particular methods. The general framework for the
thermodynamical and mechanical processes is based on conservation laws while
the vorticity self-organization needs a variational approach. It is difficult
to estimate to what extent the vorticity self-organization (a purely kinematic
process) have influenced the characteristics of the tropical cyclone at
stationarity. If this influence is substantial it is expected that the
stationary state of the tropical cyclone has the same nature as the vortices of
many other systems in nature: ideal (Euler) fluids, superconductors, Bose -
Einstein condensate, cosmic strings, etc.
  In previous works we have formulated a description of the $2D$ vorticity
self-organization in terms of a classical field theory. The field theoretical
(FT) formulation finds that the quasi-coherent form of the atmospheric vortex
(tropical cyclone) at stationarity is an expression of the Self-Duality.
  In the present work we examine a strong property of the tropical cyclone,
which arises in the FT formulation in a natural way: the equality of the masses
of the particles associated to the matter field and respectively to the gauge
field in the FT model is translated into the equality between the maximum
radial extension of the tropical cyclone and the Rossby radius. For the cases
where the FT model is a good approximation we calculate characteristic
quantities of the tropical cyclone and find good comparison with observational
data.


title:
Computational study of the structural, electronic and optical properties
  of bulk palladium nitrides

abstract:
  The atomic and electronic structures of Pd3N, PdN and PdN2 were investigated
using ab initio density-functional theory (DFT). We studied cohesive energy vs.
volume equation of states (EOS) for a set of reported and hypothetical
structures. Obtained data was fitted to a third-order Birch-Murnaghan equation
of state (EOS) so as to identify the energetically most stable phases and to
determine their equilibrium structural parameters and stability and mechanical
properties. Electronic properties were investigated by calculating the band
diagrams and the total and partial density of states (DOS). Some possible
pressure-induced phase transitions were tested. To derive the
frequency-dependent optical spectra (i.e. absorption coefficient, reflectivity,
refractive index, and energy-loss), we performed G_0W0 calculations within the
random-phase approximation (RPA) to the dielectric tensor. Obtained results
were compared with previous studies.


title: Global Calder\`on & Zygmund theory for nonlinear parabolic systems

abstract:
  We establish a global Calder\'on & Zygmund theory for solutions of a huge
class of nonlinear parabolic systems whose model is the inhomogeneous parabolic
$p$-Laplacian system \begin{equation*} \left\{\begin{array}{cc} \partial_t u -
\Div (|Du|^{p-2}Du) = \Div (|F|^{p-2}F) &\mbox{in
$\Omega_T:=\Omega\times(0,T)$} \\[5pt] u=g &\mbox{on
$\partial\Omega\times(0,T)\cup \bar\Omega\times\{0\}$} \end{array}\right.
\end{equation*} with given functions $F$ and $g$. Our main result states that
the spatial gradient of the solution is as integrable as the data $F$ and $g$
up to the lateral boundary of $\Omega_T$, i.e. \begin{equation*} F,Dg\in
L^q(\Omega_T),\ \ \partial_t g\in L^{\frac{q(n+2)}{p(n+2)-n}}(\Omega_T)
\quad\Rightarrow \quad Du\in L^q(\Omega\times(\delta,T)) \end{equation*} for
any $q>p$ and $\delta\in(0,T)$, together with quantitative estimates. This
result is proved in a much more general setting, i.e. for asymptotically
regular parabolic systems.


title: Motility fractionation of bacteria by centrifugation

abstract:
  Centrifugation is a widespread laboratory technique used to separate mixtures
into fractions characterized by a specific size, weight or density. We
demonstrate that centrifugation can be also used to separate swimming cells
having different motility. To do this we study self-propelled bacteria under
the influence of an external centrifugal field. Using dynamic image correlation
spectroscopy we measure the spatially resolved motility of bacteria after
centrifugation. A significant gradient in swimming-speeds is observed for
increasing centrifugal speeds. Our results can be reproduced by a model that
treats bacteria as "hot" colloidal particles having a diffusion coefficient
that depends on the swimming speed.


title: Statistical properties of diffeomorfisms with weak invariant manifolds

abstract:
  We consider diffeomorphisms of compact Riemmanian manifolds which have a
Gibbs-Markov-Young structures, consisting of a reference set $\Lambda$ with a
hyperbolic product structure and a countable Markov partition. We assume
polynomial contraction on stable leaves, polynomial backward contraction on
unstable leaves, a bounded distortion property and a certain regularity of the
stable foliation. We establish a control on the decay of correlations and large
deviations of the SRB measure of the dynamical system, based on a polynomial
control on the Lebesgue measure of the tail of return times. Finally, we
present an example of a dynamical system defined on the torus and prove that it
verifies the properties of the Gibbs-Markov-Young structure that we considered.


title:
Evidence of resonant surface wave excitation in the relativistic regime
  through measurements of proton acceleration from grating targets

abstract:
  The interaction of laser pulses with thin grating targets, having a periodic
groove at the irradiated surface, has been experimentally investigated.
Ultrahigh contrast ($\sim 10^{12}$) pulses allowed to demonstrate an enhanced
laser-target coupling for the first time in the relativistic regime of
ultra-high intensity $>10^{19} \mbox{W/cm}^{2}$. A maximum increase by a factor
of 2.5 of the cut-off energy of protons produced by Target Normal Sheath
Acceleration has been observed with respect to plane targets, around the
incidence angle expected for resonant excitation of surface waves. A
significant enhancement is also observed for small angles of incidence, out of
resonance.


title:
A First Class Constraint Generates Not a Gauge Transformation, But a Bad
  Physical Change: The Case of Electromagnetism

abstract:
  In Dirac-Bergmann constrained dynamics, a first-class constraint typically
does not _alone_ generate a gauge transformation. Each first-class constraint
in Maxwell's theory generates a change in the electric field E by an arbitrary
gradient, spoiling Gauss's law. The secondary constraint p^i,_i=0 still holds,
but being a function of derivatives of momenta (mere auxiliary fields), it is
not directly about the observable electric field (a function of derivatives of
A), which couples to charge. Only a special combination of the two first-class
constraints, the Anderson-Bergmann-Castellani gauge generator G, leaves E
unchanged. Likewise only that combination leaves the canonical action
invariant---an argument independent of observables. If one uses a first-class
constraint to generate instead a canonical transformation, one partly strips
the canonical coordinates of physical meaning as electromagnetic potentials,
vindicating the Anderson-Bergmann Lagrangian orientation of interesting
canonical transformations. The need to keep gauge-invariant q,t-dH/dp=-E-p=0
supports using the gauge generator and primary Hamiltonian rather than the
separate first-class constraints and the extended Hamiltonian.
  Partly paralleling Pons's criticism, it is shown that Dirac's proof that a
first-class primary constraint generates a gauge transformation, by comparing
evolutions from _identical_ initial data, cancels out and hence fails to detect
the alterations made to the initial state. It also neglects the arbitrary
coordinates multiplying the secondary constraints _inside_ the canonical
Hamiltonian. Thus the gauge-generating property has been ascribed to the
primaries alone.
  Hence the Dirac conjecture about secondary first-class constraints as
generating gauge transformations rests upon a false presupposition about
primary first-class constraints. Clarity about electromagnetism help with GR.


title: On the recursive construction of indecomposable quiver representations

abstract:
  For a fixed root of a quiver, it is a very hard problem to construct all or
even only one indecomposable representation with this root as dimension vector.
We investigate two methods which can be used for this purpose. In both cases we
get an embedding of the category of representations of a new quiver into the
category of representations of the original one which increases dimension
vectors. Thus it can be used to construct indecomposable representations of the
original quiver recursively. Actually, it turns out that there is a huge class
of representations which can be constructed using these methods.


title: X-ray Enhancement And Long-term Evolution Of Swift J1822.3-1606

abstract:
  We investigate the X-ray enhancement and the long-term evolution of the
recently discovered, second "low-B magnetar" Swift J1822.3-1606 in the frame of
the fallback disk model. During a soft gamma burst episode, the inner disk
matter is pushed back to larger radii forming a density gradient at the inner
disk. Subsequent relaxation of the inner disk could account for the observed
X-ray enhancement light curve of Swift J1822.3-1606. We obtain model fits to
the X-ray data with basic disk parameters similar to those employed to explain
the X-ray outburst light curves of other AXPs and SGRs. The long period (8.4 s)
of the neutron star can be reached by the effect of the disk torques in the
long-term accretion phase (1-3 x 10^5 yrs). The currently ongoing X-ray
enhancement could be due to a transient accretion epoch, or the source could
still be in the accretion phase in quiescence. Considering these different
possibilities, we determine the model curves that could represent the long-term
rotational and the X-ray luminosity evolution of Swift J1822.3-1606, which
constrain the strength of the magnetic dipole field to the range of 1-2 x 10^12
G on the surface of the neutron star.


title:
Exclusive meson pair production and the gluonic component of the eta,
  eta' mesons

abstract:
  We present the results of recent work on the central exclusive production of
meson pairs. We concentrate on the case of flavour-singlet pseudoscalar mesons
eta, eta' and show that the central exclusive process, as modelled using a
recent novel application of the 'hard exclusive' perturbative formalism, is
potentially highly sensitive to the size of the gluon content of these states.
We also discuss the exclusive production of meson pairs in the lower mass
region, and present the first results of the new Dime Monte Carlo.


title: The Mixed Poncelet-Steiner Closure Theorem

abstract:
  We state and prove a new closure theorem closely related to the classical
closure theorems of Poncelet and Steiner. Along the way, we establish a number
of theorems concerning conic sections.


title: Quasi-Particle Interference Probe of the Self-Energy

abstract:
  Quasi-particle interference (QPI) measurements have provided a powerful tool
for determining the momentum dependence of the gap of unconventional
superconductors. Here we examine the possibility of using such measurements to
probe the frequency and momentum dependence of the electron self-energy. For
illustration, we calculate the QPI response function for a cuprate-like Fermi
surface with an electron self-energy from an RPA approximation. Then we try to
reextract the self-energy from the dispersion of the peaks in the QPI response
function using different approaches. We show that in principle it is possible
to extract the self-energy from the QPI response for certain nested momentum
directions. We discuss some of the limitations that one faces.


title: Deciphering mechanisms of enhanced-retarded oxygen diffusion in doped Si

abstract:
  In this letter, we study enhanced-retarded diffusion of oxygen in doped
silicon by means of first principle calculations. We found that the migration
of oxygen dimers can not be significantly affected by strain, doping type or
rate. We attribute the enhanced oxygen diffusion in p-doped silicon to reduced
monomer migration energy, and the retarded oxygen diffusion in Sb-doped to
oxygen trapping close to a dopant site. The two proposed kinetic and
thermodynamic mechanisms can appear at the same time and might lead to
contradictory experimental results. Such mechanisms can be involved in the
light induced degradation phenomenon in solar grade silicon.


title: Considerations on the light curve of Nova Delphini 2013

abstract:
  It is possible to evaluate the absolute magnitude of the Nova Delphini 2013
with visual observations submitted to AAVSO, following the works of Leonida
Rosino at Asiago Observatory on the novae of M31. A naif interpretative model
of the light curve is presented, based on the decreasing exponential law, in
order to open to amateur astronomers a glimpse on the complex theoretical
framework of these phenomena.


title: Generalized Dynkin Games and Doubly Reflected BSDEs with Jumps

abstract:
  We introduce a generalized Dynkin game problem with non linear conditional
expectation ${\cal E}$ induced by a Backward Stochastic Differential Equation
(BSDE) with jumps. Let $\xi, \zeta$ be two RCLL adapted processes with $\xi
\leq \zeta$. The criterium is given by \begin{equation*}
  {\cal J}_{\tau, \sigma}= {\cal E}_{0, \tau \wedge \sigma }
\left(\xi_{\tau}\textbf{1}_{\{ \tau \leq
\sigma\}}+\zeta_{\sigma}\textbf{1}_{\{\sigma<\tau\}}\right)
  \end{equation*} where $\tau$ and $ \sigma$ are stopping times valued in
$[0,T]$. Under Mokobodski's condition, we establish the existence of a value
function for this game, i.e. $\inf_{\sigma}\sup_{\tau} {\cal J}_{\tau, \sigma}
= \sup_{\tau} \inf_{\sigma} {\cal J}_{\tau, \sigma}$. This value can be
characterized via a doubly reflected BSDE. Using this characterization, we
provide some new results on these equations, such as comparison theorems and a
priori estimates. When $\xi$ and $\zeta$ are left upper semicontinuous along
stopping times, we prove the existence of a saddle point. We also study a
generalized mixed game problem when the players have two actions: continuous
control and stopping. We then address the generalized Dynkin game in a
Markovian framework and its links with parabolic partial integro-differential
variational inequalities with two obstacles.


title:
Riesz external field problems on the hypersphere and optimal point
  separation

abstract:
  We consider the minimal energy problem on the unit sphere $\mathbb{S}^d$ in
the Euclidean space $\mathbb{R}^{d+1}$ in the presence of an external field
$Q$, where the energy arises from the Riesz potential $1/r^s$ (where $r$ is the
Euclidean distance and $s$ is the Riesz parameter) or the logarithmic potential
$\log(1/r)$. Characterization theorems of Frostman-type for the associated
extremal measure, previously obtained by the last two authors, are extended to
the range $d-2 \leq s < d - 1.$ The proof uses a maximum principle for measures
supported on $\mathbb{S}^d$. When $Q$ is the Riesz $s$-potential of a signed
measure and $d-2 \leq s <d$, our results lead to explicit point-separation
estimates for $(Q,s)$-Fekete points, which are $n$-point configurations
minimizing the Riesz $s$-energy on $\mathbb{S}^d$ with external field $Q$. In
the hyper-singular case $s > d$, the short-range pair-interaction enforces
well-separation even in the presence of more general external fields. As a
further application, we determine the extremal and signed equilibria when the
external field is due to a negative point charge outside a positively charged
isolated sphere. Moreover, we provide a rigorous analysis of the three point
external field problem and numerical results for the four point problem.


title: Dual Modulation Faraday Rotation Spectroscopy of HO2

abstract:
  The technique of dual modulation Faraday rotation spectroscopy has been
applied for near shot-noise limited detection of HO2 at the exit of an
atmospheric pressure flow reactor. This was achieved by combining direct
current modulation at 51 kHz of an external cavity quantum cascade laser system
with 610 Hz modulation of the magnetic field generated by a Helmholtz coil. The
DM-FRS measurement had a 1.8 times better signal-to-noise ratio than an AC-FRS
measurement acquired under identical flow reactor conditions. Harmonic
detection of the FRS signal also eliminated the substantial DC-offset
associated with electromagnetic intereference pick-up from the Helmholtz coils
that is observed in the AC-FRS spectrum. A noise equivalent angle of 4x10^(-9)
rad Hz^(-1/2) was observed for the DM-FRS measurement, and this corresponds to
a 3 sigma detection limit of 0.2 ppmv Hz^(-1/2).


title:
Enhanced effects of temporal variation of the fundamental constants in
  ^{2}\Pi_{1/2} term diatomic molecules: ^{207}Pb^{19}F

abstract:
  The ^{207}Pb^{19}F molecule possesses a pair of closely spaced levels of
opposite parity due to near cancelation of the omega-type doubling and magnetic
hyperfine interaction energy shifts [Alphei et al., Phys. Rev. A, 83, 040501
(2011)]. We calculate the dependence of the transition frequency between these
levels on the fine-structure constant (\alpha) and the ratio of the light quark
masses to the quantum chromodynamics scale (m_q/\Lambda_{QCD}), and find large
enhancement of the relative effects of the variation of these parameters. Note
that the effect of \alpha-variation appears mainly due to the significant
difference in the relativistic correction factors for the fine and hyperfine
structure. We hence suggest the ^{207}Pb^{19}F molecule as a candidate system
for investigating the possible temporal variation of the fundamental constants.


title: Triangular homotopy equivalences

abstract:
  A map $f:X\to Y$ to a simplicial complex $Y$ is called a $Y$-triangular
homotopy equivalence if it has a homotopy inverse $g$ and homotopies
$h_1:f\circ g\simeq \mathrm{id}_Y$, $h_2:g\circ f\simeq \mathrm{id}_X$ such
that for all simplices $\sigma\in Y$, $f|_\sigma:f^{-1}(\sigma) \to \sigma$ is
a homotopy equivalence with inverse $g|_\sigma:\sigma \to f^{-1}(\sigma)$ and
homotopies $h_1|_\sigma$ and $h_2|_\sigma$. In this paper we prove that for all
pairs $X,Y$ of finite-dimensional locally finite simplicial complexes there is
an $\epsilon(X,Y)>0$ such that any $\epsilon$-controlled homotopy equivalence
$f:X\to Y$ for $\epsilon<\epsilon(X,Y)$ is homotopic to a $Y$-triangular
homotopy equivalence. Conversely, we conjecture that it is possible to
`subdivide' a $Y$-triangular homotopy equivalence by finding a homotopic $(Sd\,
Y)$-triangular homotopy equivalence, consequently a $Y$-triangular homotopy
equivalence would be homotopic to an $\epsilon$-controlled homotopy equivalence
for all $\epsilon>0$.


title: Spectral sets and distinguished varieties in the symmetrized bidisc

abstract:
  We show that for every pair of matrices (S,P), having the closed symmetrized
bidisc $\Gamma$ as a spectral set, there is a one dimensional complex algebraic
variety $\Lambda$ in $\Gamma$ such that for every matrix valued polynomial f,
the norm of f(S,P) is less then the sup norm of f on $\Lambda$.
  The variety $\Lambda$ is shown to have a particular determinantal
representation, related to the so-called "fundamental operator" of the pair
(S,P).
  When (S,P) is a strict $\Gamma$-contraction, then $\Lambda$ is a
distinguished variety in the symmetrized bidisc, i.e., a one dimensional
algebraic variety that exits the symmetrized bidisc through its distinguished
boundary. We characterize all distinguished varieties of the symmetrized bidisc
by a determinantal representation as above.


title:
The subarcsecond mid-infrared view of local active galactic nuclei: I.
  The N- and Q-band imaging atlas

abstract:
  We present the first subarcsecond-resolution mid-infrared (MIR) atlas of
local active galactic nuclei (AGN). Our atlas contains 253 AGN with a median
redshift of z=0.016, and includes all publicly available MIR imaging performed
to date with ground-based 8-m class telescopes, a total of 895 independent
measurements. Of these, more than 60% are published here for the first time. We
detect extended nuclear emission in at least 21% of the objects, while another
19% appear clearly point-like, and the remaining objects cannot be constrained.
Where present, elongated nuclear emission aligns with the ionization cones in
Seyferts. Subarcsecond resolution allows us to isolate the AGN emission on
scales of a few tens of parsecs and to obtain nuclear photometry in multiple
filters for the objects. Median spectral energy distributions (SEDs) for the
different optical AGN types are constructed and individual MIR 12 and 18micron
continuum luminosities are computed. These range over more than six orders of
magnitude. In comparison to the arcsecond-scale MIR emission as probed by
Spitzer, the continuum emission is much lower on subarcsecond scales in many
cases. The silicate feature strength is similar on both scales and generally
appears in emission (absorption) in type I (II) AGN. However, the polycyclic
aromatic hydrocarbon emission appears weaker or absent on subarcsecond scales.
The differences of the MIR SEDs on both scales are particularly large for
AGN/starburst composites and close-by (and weak) AGN. The nucleus dominates
over the total emission of the galaxy only at luminosities >=10^(44)erg/s. The
AGN MIR atlas is well suited not only for detailed investigation of individual
sources but also for statistical studies of AGN unification.


title: Asymmetry in effective fields of spin-orbit torques in Pt/Co/Pt stacks

abstract:
  Measurements of switching via spin-orbit coupling (SOC) mechanisms are
discussed for a pair of inverted Pt/Co/Pt stacks with asymmetrical Pt
thicknesses. Taking into account the planar Hall effect contribution, effective
fields of spin-orbit torques (SOT) are evaluated using lock-in measurements of
the first and second harmonics of the Hall voltage. Reversing the stack
structure leads to significant asymmetries in the switching behavior, including
clear evidence of a nonlinear current dependence of the transverse effective
field. Our results demonstrate potentially complex interplay in devices with
all-metallic interfaces utilizing SOT.


title: Dynamical Volume Element in Scale-Invariant and Supergravity Theories

abstract:
  The use in the action integral of a volume element of the form $\Phi d^{D}x$,
where $\Phi$ is a metric-independent measure density, can yield new interesting
results in all types of known generally coordinate-invariant theories: (1) 4-D
theories of gravity plus matter fields; (2) reparametrization invariant
theories of extended objects (strings and branes); (3) supergravity theories.
In case (1) we obtain interesting insights concerning the cosmological constant
problem, inflation and quintessence without the fifth force problem. In case
(2) the above formalism leads to dynamically induced tension and to string
models of non-abelian confinement. In case (3), we show that the
modified-measure supergravity generates an arbitrary dynamically induced
cosmological constant, i.e., a new mechanism of dynamical supersymmetry
breaking.


title: Relay-assisted Multiple Access with Full-duplex Multi-Packet Reception

abstract:
  The effect of full-duplex cooperative relaying in a random access multiuser
network is investigated here. First, we model the self-interference incurred
due to full-duplex operation, assuming multi-packet reception capabilities for
both the relay and the destination node. Traffic at the source nodes is
considered saturated and the cooperative relay, which does not have packets of
its own, stores a source packet that it receives successfully in its queue when
the transmission to the destination has failed. We obtain analytical
expressions for key performance metrics at the relay, such as arrival and
service rates, stability conditions, and average queue length, as functions of
the transmission probabilities, the self interference coefficient, and the
links' outage probabilities. Furthermore, we study the impact of the relay node
and the self-interference coefficient on the per-user and aggregate throughput,
and the average delay per packet. We show that perfect self-interference
cancelation plays a crucial role when the SINR threshold is small, since it may
result to worse performance in throughput and delay comparing with the
half-duplex case. This is because perfect self-interference cancelation can
cause an unstable queue at the relay under some conditions.


title: Radioactively Powered Emission from Black Hole-Neutron Star Mergers

abstract:
  Detection of electromagnetic counterparts of gravitational wave (GW) sources
is important to unveil the nature of compact binary coalescences. We perform
three-dimensional, time-dependent, multi-frequency radiative transfer
simulations for radioactively powered emission from the ejecta of black hole
(BH) - neutron star (NS) mergers. Depending on the BH to NS mass ratio, spin of
the BH, and equations of state of dense matter, BH-NS mergers can eject more
material than NS-NS mergers. In such cases, radioactively powered emission from
the BH-NS merger ejecta can be more luminous than that from NS-NS mergers. We
show that, in spite of the expected larger distances to BH-NS merger events,
observed brightness of BH-NS mergers can be comparable to or even higher than
that of NS-NS mergers. We find that, when the tidally disrupted BH-NS merger
ejecta are confined to a small solid angle, the emission from BH-NS merger
ejecta tends to be bluer than that from NS-NS merger ejecta for a given total
luminosity. Thanks to this property, we might be able to distinguish BH-NS
merger events from NS-NS merger events by multi-band observations of the
radioactively powered emission. In addition to the GW observations, such
electromagnetic observations can potentially provide independent information on
the nature of compact binary coalescences.


title: On price of symmetrisation

abstract:
  We introduce the price of symmetrisation, a concept that aims to compare
fundamental differences (gap and quotient) between values of a given graph
invariant for digraphs and the values of the same invariant of the symmetric
versions of these digraphs. Basically, given some invariant our goal is to
characterise digraphs that maximise price of symmetrisation. In particular, we
show that for some invariants, as diameter or domination number, the problem is
easy.
  The main contribution of this paper is about (partial) results on the price
of symmetrisation of the average distance. It appears to be much more intricate
than the simple cases mentioned above. First, we state a conjecture about
digraphs that maximise this price of symmetrisation. Then, we prove that this
conjecture is true for some particular class of digraphs (called bags) but it
remains open for general digraphs. Moreover, we study several graph
transformations in order to remove some configurations that do not appear in
the conjectured extremal digraphs.


title:
Calculating field emission currents in nanodiodes - a multi-group
  formalism with space charge and exchange-correlation effects

abstract:
  Inclusion of electron-electron interaction is essential in nano-diodes to
understand the underlying physical phenomenon and tailor devices accordingly.
However, both space charge and exchange-correlation interactions involve
electrons at different energies and hence a self-consistent multi-energy-group
solution of the Schr\{o}dinger-Poisson system is required. It is shown here
that the existence of a limiting density-dependent potential at low applied
voltages allows calculation of the field emission current. Despite additional
interactions, a Fowler-Nordheim behaviour is observed. It is also found that
the exchange-correlation potential dominates at these voltages in nanogaps and
possibly leads to a higher turn-on voltage.


title: Brauer-Thrall type theorems for derived module categories

abstract:
  The numerical invariants (global) cohomological length, (global)
cohomological width, and (global) cohomological range of complexes (algebras)
are introduced. Cohomological range leads to the concepts of derived bounded
algebras and strongly derived unbounded algebras naturally. The first and
second Brauer-Thrall type theorems for the bounded derived category of a
finite-dimensional algebra over an algebraically closed field are obtained. The
first Brauer-Thrall type theorem says that derived bounded algebras are just
derived finite algebras. The second Brauer-Thrall type theorem says that an
algebra is either derived discrete or strongly derived unbounded, but not both.
Moreover, piecewise hereditary algebras and derived discrete algebras are
characterized as the algebras of finite global cohomological width and finite
global cohomological length respectively.


title:
Efficient Algorithms for Computing Rational First Integrals and Darboux
  Polynomials of Planar Polynomial Vector Fields

abstract:
  We present fast algorithms for computing rational first integrals with
bounded degree of a planar polynomial vector field. Our approach is inspired by
an idea of Ferragut and Giacomini. We improve upon their work by proving that
rational first integrals can be computed via systems of linear equations
instead of systems of quadratic equations. This leads to a probabilistic
algorithm with arithmetic complexity $\bigOsoft(N^{2 \omega})$ and to a
deterministic algorithm solving the problem in $\bigOsoft(d^2N^{2 \omega+1})$
arithmetic operations, where $N$ denotes the given bound for the degree of the
rational first integral, and where $d \leq N$ is the degree of the vector
field, and $\omega$ the exponent of linear algebra. We also provide a fast
heuristic variant which computes a rational first integral, or fails, in
$\bigOsoft(N^{\omega+2})$ arithmetic operations. By comparison, the best
previous algorithm uses at least $d^{\omega+1}\, N^{4\omega +4}$ arithmetic
operations. We then show how to apply a similar method to the computation of
Darboux polynomials. The algorithms are implemented in a Maple package which is
available to interested readers with examples showing its efficiency.


title:
$\mathfrak{sl}_3$-web bases, intermediate crystal bases and
  categorification

abstract:
  We give an explicit graded cellular basis of the $\mathfrak{sl}_3$-web
algebra $K_S$.
  In order to do this, we identify Kuperberg's basis for the
$\mathfrak{sl}_3$-web space $W_S$ with a version of Leclerc-Toffin's
intermediate crystal basis and we identify Brundan, Kleshchev and Wang's degree
of tableaux with the weight of flows on webs and the $q$-degree of foams.
  We use these observations to give a "foamy" version of Hu and Mathas graded
cellular basis of the cyclotomic Hecke algebra which turns out to be a graded
cellular basis of the $\mathfrak{sl}_3$-web algebra.
  We restrict ourselves to the $\mathfrak{sl}_3$ case over $\mathbb{C}$ here,
but our approach should, up to the combinatorics of $\mathfrak{sl}_N$-webs,
work for all $N>1$ or over $\mathbb{Z}$.


title:
H-alpha survey of low-mass satellites of the neighbouring galaxies M31
  and M81

abstract:
  Images have been obtained at the 6-m telescope at the Special Astrophysical
Observatory (SAO) of the Russian Academy of Sciences in the H-alpha line and in
the continuum for 20 dwarf spheroidal satellites of M31: And XI-And XXX, plus
the distant Globular cluster Bol 520. Their star formation rates (FR) are
estimated using the H-alpha flux and the ultraviolet FUV flux measured with the
GALEX space telescope. Most of the dSph satellites of M31 have extremely low
star formation rates with a characteristic upper limit of SFR~5x10^{-7}. We
have made similar estimates of SFR from the H-alpha and FUV fluxes for 13
galaxies with low surface brightness recently discovered in the neighborhood of
M81. Eleven of them are physical satellites of M81 with typical SFR< 5x10^{-5}.
The median stellar masses of these satellites of M31 and M81 are 0.9 and 1.9
million solar masses, respectively. Our H-alpha observations place a 2-3 times
stricter limit on the value of SFR than the data from the GALEX satellite, with
a substantially higher (3-5 times) angular resolution.


title:
The Euler number of the Jacobi factor of a plane curve singularity whose
  semigroup is $\langle4,6,13\rangle$

abstract:
  Piontkowski calculated the Euler number of Jacobi factors of plane curve
singularities with semigroups $< p, q>$, $< 4, 2q, s>$, $< 6,8,s>$ and $< 6,10,
s>$. %His analysis was done by decomposing the Jacobi factors into affine
cells. In this paper, we show that a Jacobi factor for any curve singularity
admits a cell decomposition by virtue of Pfister and Steenbrink's theory for
punctual Hilbert schemes. We also introduce a computational method to determine
the number of affine cells in the decomposition. Applying it, we compute the
the Euler number of the Jacobi factor of a singularity with a semigroup $<
4,6,13>$. Our result gives a counterexample for Piontkowski's calculation.


title: Motives of quadric bundles

abstract:
  This article is about motives of quadric bundles. In the case of odd
dimensional fibers and where the basis is of dimension two we give an explicit
relative and absolute Chow-K\"unneth decomposition. This shows that the motive
of the quadric bundle is isomorphic to the direct sum of the motive of the base
and the Prym motive of a double cover of the discriminant. In particular this
is a refinement with $\mathbb Q$ coefficients of a result of Beauville
concerning the cohomology and the Chow groups of an odd dimensional quadric
bundle over $\mathbb P^2$. This Chow-K\"unneth decomposition satisfies Murre's
conjectures II and III. This article is a generalization of an article of Nagel
and Saito on conic bundles \cite{NS}.


title:
The $(k,\ell)$-rainbow index for complete bipartite and multipartite
  graphs

abstract:
  A tree in an edge-colored graph $G$ is said to be a rainbow tree if no two
edges on the tree share the same color. Given two positive integers $k$, $\ell$
with $k\geq 3$, the \emph{$(k,\ell)$-rainbow index} $rx_{k,\ell}(G)$ of $G$ is
the minimum number of colors needed in an edge-coloring of $G$ such that for
any set $S$ of $k$ vertices of $G$, there exist $\ell$ internally disjoint
rainbow trees connecting $S$. This concept was introduced by Chartrand et al.,
and there have been very few results about it. In this paper, we investigate
the $(k,\ell)$-rainbow index for complete bipartite graphs and complete
multipartite graphs. Some asymptotic values of their $(k,\ell)$-rainbow index
are obtained.


title: \'Etale contractible varieties in positive characteristic

abstract:
  Unlike in characteristic 0, there are no non-trivial smooth varieties over an
algebraically closed field k of characteristic p>0 that are contractible in the
sense of etale homotopy theory.


title: Centralisers in Classical Lie Algebras

abstract:
  In this thesis we discuss some properties of centralisers in classical Lie
algebas and related structures. Our results follow three distinct but related
themes: the modular representation theory of centralisers, the sheets of simple
Lie algebras and the representation theory of finite W-algebras and enveloping
algebras.


title:
Constraints to new physics models for the proton charge radius puzzle
  from the decay $K^+ \rightarrow \mu^+ +\nu + e^- + e^+$

abstract:
  A possible explanation for the discrepancy between electronic and muonic
hydrogen measurements of the proton charge radius are new, lepton-universality
violating interactions. Several new couplings and particles have been suggested
that account for this discrepancy. At present, these explanations are poorly
constrained. Experiments such as the upcoming kaon decay experiment at JPARC
may constrain or eliminate some explanations by sensitivity to the decay
channel $K^+ \rightarrow \mu^+ +\nu + e^- + e^+$. We calculate the predicted
contributions of the various explanations to this channel. The predicted
signals, if present, should be large enough to be resolved in the experiment.


title:
On the Leray-Hopf Extension Condition for the Steady-State Navier-Stokes
  Problem in Multiply-Connected Bounded Domains

abstract:
  Employing the approach of A. Takeshita [Pacific J. Math., Vol. 157 (1993),
151--158], we give an elementary proof of the invalidity of the Leray-Hopf
Extension Condition for certain multiply connected bounded domains of R^n,
n=2,3, whenever the flow through the different components of the boundary is
non-zero. Our proof is alternative to and, to an extent, more direct than the
recent one proposed by J.G. Heywood [J. Math. Fluid Mech. Vol. 13 (2011),
449--457].


title: Long lived charginos in Natural SUSY?

abstract:
  Supersymmetric models with a small neutralino-chargino mass difference, and
as a result metastable charginos, have been a popular topic of investigation in
collider phenomenology, e.g. in anomaly-mediated models of supersymmetry
breaking. Recently, the absence of any supersymmetric signal at the 8 TeV LHC
data has led to significant interest in the so-called Natural SUSY models with
light higgsinos. These models also have a naturally small neutralino-chargino
mass difference. However, we show here that when relevant indirect constraints
from results at the LHC and elsewhere are applied, this possibility is heavily
constrained within the Minimal Supersymmetric Standard Model (MSSM): massive
metastable higgsinos are not a signature of Natural SUSY.


title: Giant nonlinearity in Zero-Gap Semiconductor Superlattices

abstract:
  Using an effective medium approach, we describe how by combining
mercury-cadmium-telluride semiconductor alloys with band gap energies of
opposite signs it may be possible to design a superlattice where the electrons
have isotropic zero-effective mass and a single valley linear energy-momentum
dispersion. We demonstrate that because of the zero-mass property, the
superlattice may have a strong nonlinear response under the action of an
external electromagnetic field.


title: On the recently proposed Mimetic Dark Matter

abstract:
  Recently, an interesting gravitational model was proposed in order to mimic
the effect of Dark Matter. Chamseddine and Mukhanov in the arXiv preprint
1308.5410 have separated the conformal mode of a physical metric in the form of
a squared gradient of an auxiliary scalar field. Notably, the variational
principle has given a more general equation of motion than that of purely
Einsteinian relativity theory, with a possibility of reproducing an effective
Dark Matter. In this short paper, we explain the nature of this phenomenon in
terms of the class of functions on which the variation takes place. Then we
give a more transparent equivalent formulation of the model without an
auxiliary metric. Finally, we speculate a bit about possible extensions.


title:
A robust public catalogue of voids and superclusters in the SDSS Data
  Release 7 galaxy surveys

abstract:
  The study of the interesting cosmological properties of voids in the Universe
depends on the efficient and robust identification of such voids in galaxy
redshift surveys. Recently, Sutter et al. (2012) have published a public
catalogue of voids in the Sloan Digital Sky Survey Data Release 7 main galaxy
and luminous red galaxy samples, using the void-finding algorithm ZOBOV, which
is based on the watershed transform. We examine the properties of this
catalogue and show that it suffers from several problems and inconsistencies,
including the identification of some extremely overdense regions as voids. As a
result, cosmological results obtained using this catalogue need to be
reconsidered. We provide instead an alternative, self-consistent, public
catalogue of voids in the same galaxy data, obtained from using an improved
version of the same watershed transform algorithm. We provide a more robust
method of dealing with survey boundaries and masks, as well as with a radially
varying selection function, which means that our method can be applied to any
other survey. We discuss some basic properties of the voids thus discovered,
and describe how further information may be obtained from the catalogue. In
addition, we apply an inversion of the algorithm to the same data to obtain a
corresponding catalogue of large-scale overdense structures, or
"superclusters". Our catalogues are available for public download at
www.hip.fi/nadathur/download/dr7catalogue.


title:
Systematic Microwave Source Motions along Flare-arcade Observed by
  Nobeyama Radioheliograph and AIA/SDO

abstract:
  We found systematic microwave source motions along a flare-arcade using
Nobeyama Radioheliograph (NoRH) 17 GHz images. The motions were associated with
a X-class disk flare which occurred on 15th February 2011. For this study, we
also used EUV images from Atmospheric Imaging Assembly (AIA) and magnetograms
from Helioseismic and Magnetic Imager (HMI) onboard Solar Dynamics Observatory,
and multi-channel microwave data from Nobeyama Radiopolarimeters (NoRP) and
Korean Solar Radio Burst Locator (KSRBL). We traced centroids of the microwave
source observed by NoRH 17 GHz during the flare and found two episodes of the
motion with several facts: 1) The microwave source moved systematically along
the flare-arcade, which was observed by the AIA 94 A in a direction parallel to
the neutral line. 2) The period of each episode was 5 min and 14 min,
respectively. 3) Estimated parallel speed was 34 km/s for the first episode and
22 km/s for the second episode. The spectral slope of microwave flux above 10
GHz obtained by NoRP and KSRBL was negative for both episodes, and for the last
phase of the second episodes, it was flat with the flux of 150 sfu. The
negative spectrum and the flat with high flux indicate that the gyrosynchrotron
emission from accelerated electrons was dominant during the source motions. The
sequential images from the AIA 304 A and 94 A channels revealed that there were
successive plasma eruptions and each eruption was initiated just before the
start time of the microwave sources motion. Based on the results, we suggest
that the microwave source motion manifests the displacement of the particle
acceleration site caused by plasma eruptions.


title:
Fluctuations and correlations of conserved charges in an excluded volume
  hadron resonance gas model

abstract:
  We present temperature ($T$) and baryonic chemical potential ($\mu_B$)
dependence of higher order fluctuations and correlation between conserved
charges in Excluded Volume Hadron Resonance Gas (EVHRG) model. Products of
moments, such as ratio of variance to mean ($\sigma^2/M)$, product of skewness
and standard deviation ($S\sigma$), product of kurtosis and variance
($\kappa\sigma^2$), for net-proton, net-kaon and net-charge have been evaluated
on the phenomenologically determined freeze-out curve. Further, products of
moments for net-proton and net-charge have been compared with the experimental
data measured by STAR experiment. The dependence of the model result on the
hadronic radius parameter has also been discussed.


title: On the isotropic moduli of 2D strain-gradient elasticity

abstract:
  In the present paper, the simplest model of strain-gradient elasticity will
be considered, that is the isotropy in a bidimensional space. Paralleling the
definition of the classic elastic moduli, our aim is to introduce second-order
isotropic moduli having a mechanical interpretation. A general construction
process of these moduli will be proposed. As a result it appears that many sets
can be defined, each of them constituted of 4 moduli: 3 associated with 2
distinct mechanisms and the last one coupling these mechanisms. We hope that
these moduli (and the construction process) will be useful for forthcoming
investigations on strain-gradient elasticity.


title:
Re-entrance of Gapless Quantum Spin Liquids Observed in a Newly
  Synthesized Spin-1/2 Kagome Antiferromagnet $ZnCu_{3}(OH)_{6}SO_{4}$

abstract:
  Quantum spin liquid (QSL) is a novel state of matter with exotic excitations
and was theoretically predicted to be realized most possibly in an S=1/2 kagome
antiferromagnet. Experimentally searching for the candidate materials is a big
challenge in condensed matter physics and only two such candidates were
reported so far. Here we report the successful synthesis of a new spin-1/2
kagome antiferromagnet ZnCu3(OH)6SO4. No magnetic ordering is observed down to
50 mK, despite a moderately high Weiss temperature of {\theta}W ~ -79 K. It
strongly suggests that the material is a new QSL candidate. Most interestingly,
the magnetic specific heat clearly exhibits linear behaviors in two
low-temperature regions. Both behaviors exactly correspond to two
temperature-independent susceptibilities. These consistently reveal a novel
re-entrance phenomenon of gapless QSL state at the lowest temperatures. The
findings provide new insights into QSL ground and excited states and will
inspire new theoretical and experimental studies.


title:
Slow Magnetoacoustic Oscillations in the Microwave Emission of Solar
  Flares

abstract:
  Analysis of the microwave data, obtained in the 17 GHz channel of the
Nobeyama Radioheliograph during the M1.6 flare on 4th Nov 2010, revealed the
presence of 11.8-min oscillations of the emitting plasma density. The oscilla-
tions decayed with the characteristic time of about 25-min. These oscillations
are also well-seen in the variation of EUV emission intensity measured in the
335 A channel of SDO/AIA. The observed properties of the oscillations are
consistent with the properties of so-called SUMER oscillations, observed in the
EUV and soft X-ray bands usually as a periodic Doppler shift. The accepted
interpretation of SUMER oscillations is a standing slow magnetoacoustic wave.
Our analysis presents the first direct observation of the slow magnetoacoustic
oscillations in the microwave emission of a solar flare.


title: Lemma Mining over HOL Light

abstract:
  Large formal mathematical libraries consist of millions of atomic inference
steps that give rise to a corresponding number of proved statements (lemmas).
Analogously to the informal mathematical practice, only a tiny fraction of such
statements is named and re-used in later proofs by formal mathematicians. In
this work, we suggest and implement criteria defining the estimated usefulness
of the HOL Light lemmas for proving further theorems. We use these criteria to
mine the large inference graph of all lemmas in the core HOL Light library,
adding thousands of the best lemmas to the pool of named statements that can be
re-used in later proofs. The usefulness of the new lemmas is then evaluated by
comparing the performance of automated proving of the core HOL Light theorems
with and without such added lemmas.


title: Reciprocity as the foundation of Financial Economics

abstract:
  This paper argues that the fundamental principle of contemporary financial
economics is balanced reciprocity, not the principle of utility maximisation
that is important in economics more generally. The argument is developed by
analysing the mathematical Fundamental Theory of Asset Pricing with reference
to the emergence of mathematical probability in the seventeenth century in the
context of the ethical assessment of commercial contracts. This analysis is
undertaken within a framework of Pragmatic philosophy and Virtue Ethics. The
purpose of the paper is to mitigate future financial crises by reorienting
financial economics to emphasise the objectives of market stability and social
cohesion rather than individual utility maximisation.


title: Free Particle Wave Function and Niederer's Transformation

abstract:
  The solutions to the free Schroedinger equation discussed by P. Strange
(arXiv: 1309.6753) and A. Aiello (arXiv: 1309.7899) are analyzed. It is shown
that their properties can be explained with the help of Niederer's
transformation.


title: ON cyclotomic elements and cyclotomic subgroups in K_{2} of a field

abstract:
  The problem of expressing an element of K_2(F) in a more explicit form gives
rise to many works. To avoid a restrictive condition in a work of Tate, Browkin
considered cyclotomic elements as the candidate for the element with an
explicit form. In this paper, we modify and change Browkin's conjecture about
cyclotomic elements into more precise forms, in particular we introduce the
conception of cyclotomic subgroup. In the rational function field cases, we
determine completely the exact numbers of cyclotomic elements and cyclotomic
subgroups contained in a subgroup generated by finitely many different
cyclotomic elements, while in the number field cases, using Faltings' theorem
on Mordell conjecture we prove that there exist subgroups generated by an
infinite number of cyclotomic elements to the power of some prime, which
contain no nontrivial cyclotomic elements.


title:
X-ray Emission from the Wolf-Rayet Bubble NGC 6888. I. Chandra ACIS-S
  Observations

abstract:
  We analyze Chandra observations of the Wolf-Rayet (WR) bubble NGC 6888. This
WR bubble presents similar spectral and morphological X-ray characteristics to
those of S 308, the only other WR bubble also showing X-ray emission. The
observed spectrum is soft, peaking at the N VII line emission at 0.5 keV with
additional line emission at 0.7 - 0.9 keV and a weak tail of harder emission up
to ~1.5 keV. This spectrum can be described by a two-temperature optically thin
plasma emission model (T_{1}~1.4x10^{6} K, T_{2}~7.4x10^{6} K). We confirm the
results of previous X-ray observations that no noticeable temperature
variations are detected in the nebula. The X-ray-emitting plasma is distributed
in three apparent morphological components: two caps along the tips of the
major axis and an extra contribution toward the northwest blowout not reported
in previous analysis of the X-ray emission toward this WR nebula. Using the
plasma model fits of the Chandra ACIS spectra for the physical properties of
the hot gas and the ROSAT PSPC image to account for the incomplete coverage of
Chandra observations, we estimate a luminosity of L_X = (7.7\pm0.1)x10^{33}
erg/s for NGC 6888 at a distance of 1.26 kpc. The average rms electron density
of the X-ray-emitting gas is >= 0.4 cm^{-3} for a total mass >= 1.2 Msun.


title: Rational maps without Herman rings

abstract:
  Let $f$ be a rational map with degree at least two. We prove that $f$ has at
least $2$ disjoint and infinite critical orbits in the Julia set if it has a
Herman ring. This result is sharp in the following sense: there exists a cubic
rational map having exactly two critical grand orbits but also having a Herman
ring. In particular, $f$ has no Herman rings if it has at most one infinite
critical orbit in the Julia set. These criterions derive some known results
about the rational maps without Herman rings.


title:
Constitutive relations, off shell duality rotations and the
  hypergeometric form of Born-Infeld theory

abstract:
  We review equivalent formulations of nonlinear and higher derivatives
theories of electromagnetism exhibiting electric-magnetic duality rotations
symmetry. We study in particular on shell and off shell formulations of this
symmetry, at the level of action functionals as well as of equations of motion.
We prove the conjecture that the action functional leading to Born-Infeld
nonlinear electromagnetism, that is duality rotation invariant off shell and
that is known to be a root of an algebraic equation of fourth order, is a
hypergeometric function.


title:
Fluctuation of gauge field for general nonlinear Fokker-Planck equation
  and covariant version of Fisher information matrix

abstract:
  We clarify a strong link between general nonlinear Fokker-Planck equations
with gauge fields associated with nonequilibrium dynamics and the Fisher
information of the system. The notion of Abelian gauge theory for the
non-equilibrium Fokker-Planck equation has proposed in the literature, in which
the associated curvature represents internal geometry. We present the
fluctuation of the gauge field can be decomposed into three parts. We further
show that if we define the Fisher information matrix by using a covariant
derivative then it gives correlation of the flux components but it is not gauge
invariant.


title: MizAR 40 for Mizar 40

abstract:
  As a present to Mizar on its 40th anniversary, we develop an AI/ATP system
that in 30 seconds of real time on a 14-CPU machine automatically proves 40% of
the theorems in the latest official version of the Mizar Mathematical Library
(MML). This is a considerable improvement over previous performance of large-
theory AI/ATP methods measured on the whole MML. To achieve that, a large suite
of AI/ATP methods is employed and further developed. We implement the most
useful methods efficiently, to scale them to the 150000 formulas in MML. This
reduces the training times over the corpus to 1-3 seconds, allowing a simple
practical deployment of the methods in the online automated reasoning service
for the Mizar users (MizAR).


title:
An Empirical-Bayes Approach to Recovering Linearly Constrained
  Non-Negative Sparse Signals

abstract:
  We propose two novel approaches to the recovery of an (approximately) sparse
signal from noisy linear measurements in the case that the signal is a priori
known to be non-negative and obey given linear equality constraints, such as
simplex signals. This problem arises in, e.g., hyperspectral imaging, portfolio
optimization, density estimation, and certain cases of compressive imaging. Our
first approach solves a linearly constrained non-negative version of LASSO
using the max-sum version of the generalized approximate message passing (GAMP)
algorithm, where we consider both quadratic and absolute loss, and where we
propose a novel approach to tuning the LASSO regularization parameter via the
expectation maximization (EM) algorithm. Our second approach is based on the
sum-product version of the GAMP algorithm, where we propose the use of a
Bernoulli non-negative Gaussian-mixture signal prior and a Laplacian
likelihood, and propose an EM-based approach to learning the underlying
statistical parameters. In both approaches, the linear equality constraints are
enforced by augmenting GAMP's generalized-linear observation model with
noiseless pseudo-measurements. Extensive numerical experiments demonstrate the
state-of-the-art performance of our proposed approaches.


title:
Laser-induced electron emission from a tungsten nanotip: identifying
  above threshold photoemission using energy-resolved laser power dependencies

abstract:
  We present an experiment studying the interaction of a strongly focused 25 fs
laser pulse with a tungsten nanotip, investigating the different regimes of
laser-induced electron emission. We study the dependence of the electron yield
with respect to the static electric field applied to the tip. Photoelectron
spectra are recorded using a retarding field spectrometer and peaks separated
by the photon energy are observed with a 45 % contrast. They are a clear
signature of above threshold photoemission (ATP), and are confirmed by
extensive spectrally resolved studies of the laser power dependence.
Understanding these mechanisms opens the route to control experiment in the
strong-field regime on nanoscale objects.


title: The BlackHat Library for One-Loop Amplitudes

abstract:
  We present recent next-to-leading order (NLO) results in perturbative QCD
obtained using the BlackHat software library. We discuss the use of n-tuples to
separate the lengthy matrix-element computations from the analysis process. The
use of n-tuples allows many analyses to be carried out on the same phase-space
samples, and also allows experimenters to conduct their own analyses using the
original NLO computation.


title:
Precoding Based Network Alignment using Transform Approach for Acyclic
  Networks with Delay

abstract:
  The algebraic formulation for linear network coding in acyclic networks with
the links having integer delay is well known. Based on this formulation, for a
given set of connections over an arbitrary acyclic network with integer delay
assumed for the links, the output symbols at the sink nodes, at any given time
instant, is a $\mathbb{F}_{p^m}$-linear combination of the input symbols across
different generations where, $\mathbb{F}_{p^m}$ denotes the field over which
the network operates ($p$ is prime and $m$ is a positive integer). We use
finite-field discrete fourier transform (DFT) to convert the output symbols at
the sink nodes, at any given time instant, into a $\mathbb{F}_{p^m}$-linear
combination of the input symbols generated during the same generation without
making use of memory at the intermediate nodes. We call this as transforming
the acyclic network with delay into {\em $n$-instantaneous networks} ($n$ is
sufficiently large). We show that under certain conditions, there exists a
network code satisfying sink demands in the usual (non-transform) approach if
and only if there exists a network code satisfying sink demands in the
transform approach. When the zero-interference conditions are not satisfied, we
propose three Precoding Based Network Alignment (PBNA) schemes for three-source
three-destination multiple unicast network with delays (3-S 3-D MUN-D) termed
as PBNA using transform approach and time-invariant local encoding coefficients
(LECs), PBNA using time-varying LECs, and PBNA using transform approach and
block time-varying LECs. Their feasibility conditions are then analyzed.


title:
A formula for Beilinson's regulator map on K_1 of a fibration of curves
  having a totally degenerate semistable fiber

abstract:
  We give a systematic method for computation of Beilinson's regulator map on
K_1 of a fibration of curves which has a totally degenerate semistable fiber.


title:
Magnetization non-rational quasi-plateau and spatially modulated spin
  order in the model of the single-chain magnet, [{(CuL)_2 Dy}{Mo(CN)_8}]
  2CH_3CN H_2O

abstract:
  Using the exact solution in terms of the generalized classical transfer
matrix method we presented a detailed analysis of the magnetic properties and
ground state structure of the simplified model of the single-chain magnet,
trimetallic coordination polymer compound, [{(CuL)_2 Dy}{Mo(CN)_8}] 2CH_3CN
H_2O is N,N'-propylenebis(3-methoxysalicylideneiminato). Due to appearance of
highly anisotropic Dy3+ ion this material is an unique example of the
one-dimensional magnets with Ising and Heisenberg bonds, allowing exact
statistical-mechanical treatment. We found two zero-temperature ground states
corresponding to different part of the magnetization curve of the material. The
zero-filed ground state is shown to be an antiferromagnetic configuration with
spatial modulation of the local Dy3+(which is proven to posses well defined
Ising like properties due two large anisotropy of g-factors) and composite
S=1/2 spin of the quantum spin trimer Cu-Mo-Cu in the form
"up"-"down"-"down"-"up". Another important feature of this compound is the
appearance of the quasi-plateau at non rational value of magnetization due to
difference of the g-factors of the Cu- and Mo-ion in quantum spin trimers. The
quasi-plateau is an almost horizontal part of the magnetization curve where the
corresponding zero-temperature ground state of the chain demonstrate slow but
monotonous dependence of the magnetization on the external magnetic field,
while the $z$-projection of the total spin is constant.


title: de Bruijn-type identity for systems with flux

abstract:
  We show that an information-theoretic relation called the de Bruijn-type
identity can be reformulated in a physical context with probability currents.
The time derivatives of relative entropies under the continuity equation are
presented, which shows that the conservation of distance between a pair of
distributions is generally not guaranteed. As an important implication of these
results, we discuss and present a possible conceptual framework for the
classical no-cloning (deleting) theorem and qualitatively assert that we can
attribute the perfect performance of the operating machine to the openness
(non-vanishing flow at boundaries between the processing machine and the
system) during the process.


title: Warped Product Pointwise Semi-slant Submanifolds of Kaehler Manifolds

abstract:
  It is known that there exist no warped product semi-slant submanifolds in
Kaehler manifolds \cite{Sahin}. Recently, Chen and Garay studied
pointwise-slant submanifolds of almost Hermitian manifolds in \cite{CG} and
obtained many new results for such submanifolds. In this paper, we first
introduce pointwise semi-slant submanifolds of Kaehler manifolds and then we
show that there exists non-trivial warped product pointwise semi-slant
submanifolds of Kaehler manifold by giving an example, contrary to the
semi-slant case. We present a characterization theorem and establish an
inequality for the squared norm of the second fundamental form in terms of the
warping function for such warped product submanifolds in Kaehler manifolds. The
equality case is also considered.


title: IMSuite: A Benchmark Suite for Simulating Distributed Algorithms

abstract:
  Considering the diverse nature of real-world distributed applications that
makes it hard to identify a representative subset of distributed benchmarks, we
focus on their underlying distributed algorithms. We present and characterize a
new kernel benchmark suite (named IMSuite) that simulates some of the classical
distributed algorithms in task parallel languages. We present multiple
variations of our kernels, broadly categorized under two heads: (a) varying
synchronization primitives (with and without fine grain synchronization
primitives); and (b) varying forms of parallelization (data parallel and
recursive task parallel). Our characterization covers interesting aspects of
distributed applications such as distribution of remote communication requests,
number of synchronization, task creation, task termination and atomic
operations. We study the behavior (execution time) of our kernels by varying
the problem size, the number of compute threads, and the input configurations.
We also present an involved set of input generators and output validators.


title: Chaos properties of the one-dimensional long-range Ising spin-glass

abstract:
  For the long-range one-dimensional Ising spin-glass with random couplings
decaying as $J(r) \propto r^{-\sigma}$, the scaling of the effective coupling
defined as the difference between the free-energies corresponding to Periodic
and Antiperiodic boundary conditions $J^R(N) \equiv F^{(P)}(N)-F^{(AP)}(N) \sim
N^{\theta(\sigma)}$ defines the droplet exponent $\theta(\sigma)$. Here we
study numerically the instability of the renormalization flow of the effective
coupling $J^R(N)$ with respect to magnetic, disorder and temperature
perturbations respectively, in order to extract the corresponding chaos
exponents $\zeta_H(\sigma)$, $\zeta_J(\sigma)$ and $\zeta_T(\sigma)$ as a
function of $\sigma$. Our results for $\zeta_T(\sigma) $ are interpreted in
terms of the entropy exponent $\theta_S(\sigma) \simeq 1/3$ which governs the
scaling of the entropy difference $ S^{(P)}(N)-S^{(AP)}(N) \sim
N^{\theta_S(\sigma)}$. We also study the instability of the ground state
configuration with respect to perturbations, as measured by the spin overlap
between the unperturbed and the perturbed ground states, in order to extract
the corresponding chaos exponents $\zeta^{overlap}_H(\sigma)$ and
$\zeta^{overlap}_J(\sigma)$.


title: Gibbs Max-margin Topic Models with Data Augmentation

abstract:
  Max-margin learning is a powerful approach to building classifiers and
structured output predictors. Recent work on max-margin supervised topic models
has successfully integrated it with Bayesian topic models to discover
discriminative latent semantic structures and make accurate predictions for
unseen testing data. However, the resulting learning problems are usually hard
to solve because of the non-smoothness of the margin loss. Existing approaches
to building max-margin supervised topic models rely on an iterative procedure
to solve multiple latent SVM subproblems with additional mean-field assumptions
on the desired posterior distributions. This paper presents an alternative
approach by defining a new max-margin loss. Namely, we present Gibbs max-margin
supervised topic models, a latent variable Gibbs classifier to discover hidden
topic representations for various tasks, including classification, regression
and multi-task learning. Gibbs max-margin supervised topic models minimize an
expected margin loss, which is an upper bound of the existing margin loss
derived from an expected prediction rule. By introducing augmented variables
and integrating out the Dirichlet variables analytically by conjugacy, we
develop simple Gibbs sampling algorithms with no restricting assumptions and no
need to solve SVM subproblems. Furthermore, each step of the
"augment-and-collapse" Gibbs sampling algorithms has an analytical conditional
distribution, from which samples can be easily drawn. Experimental results
demonstrate significant improvements on time efficiency. The classification
performance is also significantly improved over competitors on binary,
multi-class and multi-label classification tasks.


title: Study of b-jet tagging performance in ALICE

abstract:
  We present the current status and Monte Carlo study based performance
estimates of b-jet tagging using ALICE, as obtained using both impact parameter
as well as secondary vertex methods. We also address the prospects of the
identification of electrons from heavy-flavour hadron decays to obtain b-jet
enhanced jet samples.


title:
Hydrodynamics of a quark droplet II: Implications of a non-zero baryon
  chemical potential

abstract:
  We present an extended version of the dynamical model for a multi-quark
droplet evolution described in our proceeding paper. The model includes
collective expansion of the droplet, effects of the vacuum pressure and surface
tension, and now a non-zero baryon number. The hadron emission from the droplet
is described following Weisskopf's statistical model. We consider evolutions of
droplets with different initial temperatures and net baryon number. It is found
that the introduction of a non-zero net baryon number does not change the
lifetime of the droplets significantly. Only when we consider an initially very
baryon-rich, low-temperature droplets is the lifetime is decreased
significantly. We have, furthermore, found a convergence of both baryon
chemical potential and temperature toward the values $\mu_{\rm B} \approx$ 450
MeV and $T \approx 150$ MeV. This convergence is linked to the competing
emission of baryons versus mesons.


title: Random Field Distributed Heisenberg Model on a Thin Film Geometry

abstract:
  The effects of the bimodal random field distribution on the thermal and
magnetic properties of of the Heisenberg thin film have been investigated by
making use of a two spin cluster with the decoupling approximation. Particular
attention has been devoted to the obtaining of phase diagrams and magnetization
behaviors. The physical behaviors of special as well as tricritical points are
discussed for a wide range of selected Hamiltonian parameters. For example, it
is found that when the strength of magnetic field increases, the locations of
special point in related plane decrease. Moreover, tricritical behavior has
been obtained for the higher values of the magnetic field, and influences of
the varying Hamiltonian parameters on its behavior have been elucidated in
detail in order to have a better understanding of mechanism underlying of the
considered system.


title:
Simultaneous constraints on the growth of structure and cosmic expansion
  from the multipole power spectra of the SDSS DR7 LRG sample

abstract:
  The anisotropic galaxy clustering on large scales provides us with a unique
opportunity to probe into the gravity theory through the redshift-space
distortions (RSDs) and the Alcock-Paczynski effect. Using the multipole power
spectra up to hexadecapole (ell=4), of the Luminous Red Galaxy (LRG) sample in
the data release 7 (DR7) of the Sloan Digital Sky Survey II (SDSS-II), we
obtain simultaneous constraints on the linear growth rate f, angular diameter
distance D_A, and Hubble parameter H at redshift z = 0.3. For this purpose, we
first extensively examine the validity of a theoretical model for the
non-linear RSDs using mock subhalo catalogues from N-body simulations, which
are constructed to match with the observed multipole power spectra. We show
that the input cosmological parameters of the simulations can be recovered well
within the error bars by comparing the multipole power spectra of our
theoretical model and those of the mock subhalo catalogues. We also carefully
examine systematic uncertainties in our analysis by testing the dependence on
prior assumption of the theoretical model and the range of wavenumbers to be
used in the fitting. These investigations validate that the theoretical model
can be safely applied to the real data. Thus, our results from the SDSS DR7 LRG
sample are robust including systematics of theoretical modeling; f(z = 0.3)
sigma_8(z = 0.3) =0.49+-0.08(stat.)+-0.04(sys.), D_A (z = 0.3)
=968+-42(stat.)+-17(sys.)[Mpc], H (z = 0.3)
=81.7+-5.0(stat.)+-3.7(sys.)[km/s/Mpc]. We believe that our method to constrain
the cosmological parameters using subhaloes catalogues will be useful for more
refined samples like CMASS and LOWZ catalogues in the Baryon Oscillation
Spectroscopic Survey in SDSS-III.


title:
Competition between band and Mott insulator in the bilayer Hubbard
  model: a dynamical cluster approximation study

abstract:
  We investigate the nature of the insulating phases in a bilayer Hubbard model
with intralayer coupling $t$ and interlayer coupling $t_{\perp}$ at large
interaction strength $U/t$ and half-filling. We consider a dynamical cluster
approximation with a cluster size of $N_c=2\times4$, where short-range spatial
fluctuations as well as on-site dynamical fluctuations are emphasized. By
varying the band splitting ($t_{\perp}/t$), we find that at
$t_{\perp}/t\simeq1.5$ the Mott behavior is rapidly suppressed in the momentum
sectors ($\pi,0$) and ($0,\pi$). At $t_{\perp}/t\simeq2.5$ Mott features
dominate in the momentum sectors ($\pi,\pi$) of the bonding band and ($0,0$) of
the anti-bonding band and at $t_{\perp}/t\simeq3.0$ a tiny scattering rate is
observed in all momentum sectors at the Fermi level, indicating a transition
from a Mott to a band insulator. We attribute such a momentum-dependent
evolution of the insulating behavior to the competition and cooperation between
short-range spatial fluctuations and interlayer coupling $t_{\perp}$ with the
help of the Coulomb interaction $U$. Finally, we also discuss the possible
appearance of non-Fermi liquid behavior away from half-filling.


title: Two-point Correlation Function of WMAP 9 year data

abstract:
  Using an optimal estimator for the CMB Angular Power Spectrum we compute the
temperature two-point correlation function of WMAP 9 year at low resolution.
Supported by realistic Monte-Carlo simulations, we evaluate how such observed
function depends on the Galactic mask. We find that it is more and more
consistent with zero (i.e. no correlation) as the Galactic mask is increased.
In particular we estimate that such a behavior happens very rarely in a
$\Lambda$CDM model, i.e. $<0.01%$ of the realizations when we adopt a mask
which leaves 46% of observed sky. This is evaluated for the so called $S_{1/2}$
estimator, already well known in literature \citep{Spergel:2003cb}. Also for
its generalization to the whole angular range $[0, \pi]$, namely $S_{1}$, we
find a very unlikely behavior which is $ \lesssim 0.04%$ C.L. for the
considered masks that cover at least $\sim 54%$ of the sky.


title: Introduction to Functional Grammars

abstract:
  Formal grammars are extensively used in Computer Science and related fields
to study the rules which govern production of a language. The use of these
grammars can be extended beyond mere language production. One possibility is to
view these grammars as logical machines, similar to automata, which can be
modified to compute or help in computation, while also performing the basic
task of language production. The difference between such a modified grammar and
an automaton will then lie in the semantics of computation performed. It is
even possible for such a grammar to appear non-functional (when no language is
produced as a result of its productions), but in reality, it might be carrying
out important tasks. Such grammars have been named Functional Grammars
(including a special sub-category, called Virtual Grammars), and their
properties are studied in the paper.


title: Coupled plasmon - phonon excitations in extrinsic monolayer graphene

abstract:
  The existence of an acoustic plasmon in extrinsic (doped or gated) monolayer
graphene was found recently in an {\it ab initio} calculation with the frozen
lattice [M. Pisarra {\it et al.}, arXiv:1306.6273, 2013]. By the {\em fully
dynamic} density-functional perturbation theory approach, we demonstrate a
strong coupling of the acoustic plasmonic mode to lattice vibrations. Thereby,
the acoustic plasmon in graphene does not exist as an isolated excitation, but
it is rather bound into a combined plasmon-phonon mode. We show that the
coupling provides a mechanism for the {\em bidirectional} energy exchange
between the electronic and the ionic subsystems with fundamentally, as well as
practically, important implications for the lattice cooling and heating by
electrons in graphene.


title: A survey for low stau yields in the MSSM

abstract:
  We study the implications of LHC results for the abundance of long-lived
staus after freeze-out from thermal equilibrium in a super-WIMP dark matter
scenario. We classify regions in the MSSM parameter space according to the stau
yield, considering all possible co-annihilation effects as well as the effects
of resonances and large Higgs-sfermion couplings. Afterwards, we examine the
viability of these regions after imposing experimental and theoretical
constraints, in particular a Higgs mass around 125 GeV and null-searches for
heavy stable charged particles (HSCP) at the LHC. We work in a pMSSM framework
and perform a Monte Carlo scan over the parameter space. To interpret the HSCP
searches in our scenario, we consider all potentially important superparticle
production processes, developing a fast estimator for NLO cross sections for
electroweak and strong production at the LHC. After applying all constraints,
we find that stau yields below 10^-14 occur only for resonant annihilation via
a heavy Higgs in combination with either co-annihilation or large left-right
stau mixing. We encounter allowed points with yields as low as 2x10^-16, thus
satisfying limits from big bang nucleosynthesis even for large stau lifetimes.


title:
Electrical, Optical and Structural Properties of Improved Transparent
  Conductive Oxide TCO Films

abstract:
  High Frequency (GW) Post Processing of Transparent Conductive Oxide, ITO,
leads to a significant improvement of Optical Transmission and Electrical
Conduction. This is also true in case of ITO films in multilayered structures.
The improvements happen without any affecting the lower layers (other layers of
the multilayered Device). This Method is extremely selective and can process
only the targeted film (layer).