title: Formation of Cyanoformaldehyde in the interstellar space

abstract:
  Cyanoformaldehyde (HCOCN) molecule has recently been suspected towards the
Sagittarius B2(N) by the Green Bank telescope, though a confirmation of this
observation has not yet been made. In and around a star forming region, this
molecule could be formed by the exothermic reaction between two abundant
interstellar species, H2CO and CN. Till date, the reaction rate coefficient for
the formation of this molecule is unknown. Educated guesses were used to
explain the abundance of this molecule by chemical modeling. In this paper, we
carried out quantum chemical calculations to find out empirical rate
coefficients for the formation of HCOCN and different chemical properties
during the formation of HCOCN molecules. Though HCOCN is stable against
unimolecular decomposition, this gas phase molecule could be destroyed by many
other means, like: ion-molecular reactions or by the effect of cosmic rays.
Ion-molecular reaction rates are computed by using the capture theories. We
have also included the obtained rate coefficients into our large gas-grain
chemical network to study the chemical evolution of these species in various
interstellar conditions. Formation of one of the isotopologue(DCOCN) of HCOCN
is also studied. Our study predicts the possibility of finding HCOCN and DCOCN
in the ice phase with a reasonably high abundance. In order to detect HCOCN or
DCOCN in various interstellar environments, it is necessary to know the
spectroscopic properties of these molecules. To this effect, we carried out
quantum chemical calculations to find out different spectral parameters of
HCOCN for the transition in electronic, infrared and rotational modes. We
clearly show how the isotopic substitution (DCOCN) plays a part in the
vibrational progressions of HCOCN.


title:
Dynamics of Self-Assembly of Model Viral Capsids in the Presence of a
  Fluctuating Membrane

abstract:
  A coarse-grained computational model is used to investigate the effect of a
fluctuating fluid membrane on the dynamics of patchy-particle assembly into
virus capsid-like cores. Results from simulations for a broad range of
parameters are presented, showing the effect of varying interaction strength,
membrane stiffness and membrane viscosity. Furthermore, the effect of
hydrodynamic interactions is investigated. Attraction to a membrane may promote
assembly, including for sub-unit interaction strengths for which it does not
occur in the bulk, and may also decrease single-core assembly time. The
membrane budding rate is strongly increased by hydrodynamic interactions. The
membrane deformation rate is important in determining the finite-time yield.
Higher rates may decrease the entropic penalty for assembly and help guide
sub-units towards each other but may also block partial cores from being
completed. For increasing sub-unit interaction strength, three regimes with
different effects of the membrane are identified.


title: Memory cell based on a $\varphi$ Josephson junction

abstract:
  The $\varphi$ Josephson junction has a doubly degenerate ground state with
the Josephson phases $\pm\varphi$. We demonstrate the use of such a $\varphi$
Josephson junction as a memory cell (classical bit), where writing is done by
applying a magnetic field and reading by applying a bias current. In the
"store" state, the junction does not require any bias or magnetic field, but
just needs to stay cooled for permanent storage of the logical bit.
Straightforward integration with Rapid Single Flux Quantum logic is possible.


title:
Classical W-algebras and generalized Drinfeld-Sokolov hierarchies for
  minimal and short nilpotents

abstract:
  We derive explicit formulas for lambda-brackets of the affine classical
W-algebras attached to the minimal and short nilpotent elements of any simple
Lie algebra g. This is used to compute explicitly the first non-trivial PDE of
the corresponding intgerable generalized Drinfeld-Sokolov hierarchies. It turns
out that a reduction of the equation corresponding to a short nilpotent is
Svinolupov's equation attached to a simple Jordan algebra, while a reduction of
the equation corresponding to a minimal nilpotent is an integrable Hamiltonian
equation on 2h-3 functions, where h is the dual Coxeter number of g. In the
case when g is sl_2 both these equations coincide with the KdV equation. In the
case when g is not of type C_n, we associate to the minimal nilpotent element
of g yet another generalized Drinfeld-Sokolov hierarchy.


title: Phylogenetic quantification of intra-tumour heterogeneity

abstract:
  Background: Intra-tumour heterogeneity (ITH) is the result of ongoing
evolutionary change within each cancer. The expansion of genetically distinct
sub-clonal populations may explain the emergence of drug resistance and if so
would have prognostic and predictive utility. However, methods for objectively
quantifying ITH have been missing and are particularly difficult to establish
in cancers where predominant copy number variation prevents accurate
phylogenetic reconstruction owing to horizontal dependencies caused by long and
cascading genomic rearrangements.
  Results: To address these challenges we present MEDICC, a method for
phylogenetic reconstruction and ITH quantification based on a Minimum Event
Distance for Intra-tumour Copynumber Comparisons. Using a transducer-based
pairwise comparison function we determine optimal phasing of major and minor
alleles, as well as evolutionary distances between samples, and are able to
reconstruct ancestral genomes. Rigorous simulations and an extensive clinical
study show the power of our method, which outperforms state-of-the-art
competitors in reconstruction accuracy and additionally allows unbiased
numerical quantification of ITH.
  Conclusions: Accurate quantification and evolutionary inference are essential
to understand the functional consequences of ITH. The MEDICC algorithms are
independent of the experimental techniques used and are applicable to both
next-generation sequencing and array CGH data.


title: Cadlag Skorokhod problem driven by a maximal monotone operator

abstract:
  The article deals with existence and uniqueness of the solution of the
following differential equation (a c\`adl\`ag Skorokhod problem) driven by a
maximal monotone operator and with singular input generated by the
c\`{a}dl\`{a}g function $m$: \[ \left\{ \begin{array} [c]{l} dx_{t}+A\left(
x_{t}\right) \left( dt\right) +dk_{t}^{d}\ni dm_{t} \,,~t\geq0,\\ x_{0}=m_{0},
\end{array} \right. \] where $k^{d}$ is a pure jump function. The jumps outside
of the constrained domain $\overline{\mathrm{D}(A)}$ are counteracted through
the generalized projection $\Pi$, by taking $x_{t}=\Pi(x_{t-}+\Delta m_{t})$,
whenever $x_{t-}+\Delta m_{t}\notin\overline {\mathrm{D}(A)}\,$. Approximations
of the solution based on discretization and Yosida penalization are considered.


title:
The stellar mass-size relation for the most isolated galaxies in the
  local Universe

abstract:
  The aim of this work is to study the effects of environment on the growth in
size of galaxies. We examine the stellar mass-size relation for a sample of
isolated galaxies interpreted as stellar systems where evolution has been
mainly governed by internal processes. Effects of environment on the stellar
mass-size relation are evaluated by comparing our results with samples of less
isolated early- and late-type galaxies, as well as, for the first time,
different spiral subtypes. We find no difference in the stellar mass-size
relation for very isolated and less isolated early-type galaxies. We find that
late-type isolated galaxies are ~1.2 times larger than less isolated objects
with similar mass. Isolated galaxies and comparison samples were divided into 6
morphological ranges (E/S0, Spirals, Sb, Sbc, Sc, and Scd-Sdm) and 5 stellar
mass bins between log(M*)=[9,11.5]. In all cases the relation is better defined
and has less scatter for the isolated galaxies. We find that as the
morphological type becomes later the galaxy size (for a fixed stellar mass)
becomes larger. For the lowest stellar mass bins log(M*)=[9,10] we find good
agreement between sizes of AMIGA and comparison spirals. The isolated spiral
galaxies in the high stellar mass bins log(M*)=[10,11] tend to be larger than
less isolated galaxies. This difference in size is found for all spiral
subtypes and becomes larger when we compare fully isolated galaxies with
galaxies having 2 or more satellites (neighbors within 3 magnitudes of
difference at a distance less than 250 kpc from the galaxy). Our results
suggest that massive spiral galaxies located in low density environments, both
in terms of major companions and satellites, have larger sizes than samples of
less isolated galaxies. Hence the environment has played a role in the growth
in size of massive spiral galaxies.


title:
Influence of substrate potential shape on the dynamics of a sliding
  lubricant chain

abstract:
  We investigate the frictional sliding of an incommensurate chain of
interacting particles confined in between two nonlinear on-site substrate
potential profiles in relative motion. We focus here on the class of
Remoissenet-Peyrard parametrized potentials $V_{\rm RP}(x,s)$, whose shape can
be varied continuously as a function of $s$, recovering the sine-Gordon
potential as particular case. The observed frictional dynamics of the system,
crucially dependent on the mutual ratios of the three periodicities in the
sandwich geometry, turns out to be significantly influenced also by the shape
of the substrate potential. Specifically, variations of the shape parameter $s$
affects significantly and not trivially the existence and robustness of the
recently reported velocity quantization phenomena [Vanossi {\it et al.}, Phys.
Rev. Lett. 97, 056101 (2006)], where the chain center-of-mass velocity to the
externally imposed relative velocity of the sliders stays pinned to exact
"plateau" values for wide ranges of the dynamical parameters.


title: Verification of Query Completeness over Processes [Extended Version]

abstract:
  Data completeness is an essential aspect of data quality, and has in turn a
huge impact on the effective management of companies. For example, statistics
are computed and audits are conducted in companies by implicitly placing the
strong assumption that the analysed data are complete. In this work, we are
interested in studying the problem of completeness of data produced by business
processes, to the aim of automatically assessing whether a given database query
can be answered with complete information in a certain state of the process. We
formalize so-called quality-aware processes that create data in the real world
and store it in the company's information system possibly at a later point.


title: Properly embedded minimal planar domains

abstract:
  In 1997, Collin proved that any properly embedded minimal surface in
$\mathbb{R}^3$ with finite topology and more than one end has finite total
Gaussian curvature. Hence, by an earlier result of Lopez and Ros, catenoids are
the only non-planar, non-simply connected, properly embedded, minimal planar
domains in $\mathbb{R}^3$ of finite topology. In 2005, Meeks and Rosenberg
proved that the only simply connected, properly embedded minimal surfaces in
$\mathbb{R}^3$ are planes and helicoids. Around 1860, Riemann defined a
one-parameter family of periodic, infinite topology, properly embedded, minimal
planar domains $\mathcal{R}_t$ in $\mathbb{R}^3$, $t\in (0,\infty )$. These
surfaces are called the Riemann minimal examples, and the family $\{
\mathcal{R}_t\} _t$ has natural limits being a vertical catenoid as $t\to 0$,
and a vertical helicoid as $t\to \infty $. In this paper we complete the
classification of properly embedded, minimal planar domains in $\mathbb{R}^3$
by proving that the only connected examples with infinite topology are the
Riemann minimal examples. We also prove that the limit ends of Riemann minimal
examples are model surfaces for the limit ends of properly embedded minimal
surfaces $M\subset \mathbb{R}^3$ of finite genus and infinite topology, in the
sense that such an $M$ has two limit ends, each of which has a representative
which is naturally asymptotic to a limit end representative of a Riemann
minimal example with the same associated flux vector.


title:
One-parameter continuous fields of Kirchberg algebras with rational
  K-theory

abstract:
  We show that separable continuous fields over the unit interval whose fibers
are stable Kirchberg algebras that satisfy the universal coefficient theorem in
KK-theory and have rational K-theory groups are classified up to isomorphism by
filtrated K-theory.


title:
A DeterministicWorst-Case Message Complexity Optimal Solution for
  Resource Discovery

abstract:
  We consider the problem of resource discovery in distributed systems. In
particular we give an algorithm, such that each node in a network discovers the
address of any other node in the network. We model the knowledge of the nodes
as a virtual overlay network given by a directed graph such that complete
knowledge of all nodes corresponds to a complete graph in the overlay network.
Although there are several solutions for resource discovery, our solution is
the first that achieves worst-case optimal work for each node, i.e. the number
of addresses (O(n)) or bits (O(n log n)) a node receives or sends coincides
with the lower bound, while ensuring only a linear runtime (O(n)) on the number
of rounds.


title:
Dynamic Coherence in Excitonic Molecular Complexes under Various
  Excitation Conditions

abstract:
  We investigate the relevance of dynamic quantum coherence in the energy
transfer efficiency of molecular aggregates. We contrast the dynamics after
excitation of a quantum mechanical system with that of a classical system. We
demonstrate how a classical description of an ensemble average can be
satisfactorily interpreted either as a single system driven by a continuous
force or as an ensemble of systems each driven by an impulsive force. We derive
the time evolution of the density matrix for an open quantum system excited by
light or by a neighboring antenna. We argue that unlike in the classical case,
the quantum description does not allow for a formal decomposition of the
dynamics into sudden jumps in the quantum mechanical state. Rather, there is a
natural finite time-scale associated with the excitation process. We propose a
simple experiment how to test the influence of this time scale on the yield of
photosynthesis. Because photosynthesis is intrinsically an average process, the
efficiency of photosynthesis can be assessed from the quantum mechanical
expectation value calculated from the second-order response theory, which has
the same validity as the perturbative description of ultrafast experiments. We
demonstrate using typical parameters of the currently most studied
photosynthetic antenna, the Fenna-Matthews-Olson (FMO) complex, and a typical
energy transfer rate from the chlorosome baseplate, that dynamic coherences are
averaged out in the complex despite excitation proceeding through a coherent
superposition of its eigenstates. The dynamic coherence averages out even when
the FMO model is completely free of all dissipation and dephasing. We conclude
that under natural excitation conditions coherent dynamics cannot be
responsible for the remarkable efficiency of the photosynthesis even when
considering the dynamics at a single molecular level.


title:
The possibility of the non-perturbative an-harmonic correction to
  Mehler's formula for propagator of the harmonic oscillator

abstract:
  We find the possibility of the non-perturbative an-harmonic correction to
Mehler's formula for propagator of the harmonic oscillator. We evaluate the
conditional Wiener measure functional integral with a term of the fourth order
in the exponent by an alternative method as in the conventional perturbative
approach. In contrast to the conventional perturbation theory, we expand into
power series the term linear in the integration variable in the exponent. We
discuss the case, when the starting point of the propagator is zero. We present
the results in analytical form for positive and negative frequency.


title:
Quantum state transfer in disordered spin chains: How much engineering
  is reasonable?

abstract:
  The transmission of quantum states through spin chains is an important
element in the implementation of quantum information technologies. Speed and
fidelity of transfer are the main objectives which have to be achieved by the
devices even in the presence of imperfections which are unavoidable in any
manufacturing process. To reach these goals, several kinds of spin chains have
been suggested, which differ in the degree of fine-tuning, or engineering, of
the system parameters. In this work we present a systematic study of two
important classes of such chains. In one class only the spin couplings at the
ends of the chain have to be adjusted to a value different from the bulk
coupling constant, while in the other class every coupling has to have a
specific value. We demonstrate that configurations from the two different
classes may perform similarly when subjected to the same kind of disorder in
spite of the large difference in the engineering effort necessary to prepare
the system. We identify the system features responsible for these similarities
and we perform a detailed study of the transfer fidelity as a function of chain
length and disorder strength, yielding empirical scaling laws for the fidelity
which are similar for all kinds of chain and all disorder models. These results
are helpful in identifying the optimal spin chain for a given quantum
information transfer task. In particular, they help in judging whether it is
worthwhile to engineer all couplings in the chain as compared to adjusting only
the boundary couplings.


title:
The existence of a canonical lifting of even Poisson Structures to the
  Algebra of Densities

abstract:
  In this note we construct a canonical lifting of arbitrary Poisson structures
on a manifold to its algbera of densities. Using this construction we proceed
to classify all extensions of a fixed structure on the original manifold to its
algebra of densities. The question is analogous to the problem studied by
H.M.Khudaverdian and Th.Voronov for odd Poisson structures and differential
operators. Although the questions are similar the results are distinctly
marked, namely in the case of even Poisson structures there always exists a
lift which is naturally defined. The proof of this result bears a remarkable
resemblance to the construction of the Frolicher-Nijenhuis bracket.


title:
Orbital-dependent effects of electron correlations in microscopic models
  for iron-based superconductors

abstract:
  The bad metal behavior in the normal state of the iron-based superconductors
suggests an intimate connection between the superconductivity and a proximity
to a Mott transition. At the same time, there is strong evidence for the
multi-orbital nature of the electronic excitations. It is then important to
understand the orbital-dependent effects of electron correlations. In this
paper we review the recent theoretical progresses on the metal-to-insulator
transition in multiorbital models for the iron-based superconductors. These
include studies of models that contain at least the 3d xy and 3d xz/yz models,
using a slave-spin technique. For commensurate filling corresponding to that of
the parent iron pnictides and chalcogenideds, a Mott transition generally
exists in all these models. Near the Mott transition, a strongly correlated
metal exhibiting bad metal features and strong orbital selectivity is
stabilized due to the interplay of Hund's coupling and orbital-degeneracy
breaking. Particularly for the alkaline iron selenides, the ordered vacancies
effectively reduce the kinetic energy, thereby pushing the system further into
the Mott-insulating regime; in the metallic state, there exists an
orbital-selective Mott phase in which the iron 3d xy orbital is Mott localized
while the other 3d orbitals are still itinerant. An overall phase diagram for
the alkaline iron selenides has been proposed, in which the orbital-selective
Mott phase connects between the superconducting phase and the Mott-insulating
parent state.


title:
Rate of mutual information between coarse-grained non-Markovian
  variables

abstract:
  The problem of calculating the rate of mutual information between two
coarse-grained variables that together specify a continuous time Markov process
is addressed.
  As a main obstacle, the coarse-grained variables are in general
non-Markovian, therefore, an expression for their Shannon entropy rates in
terms of the stationary probability distribution is not known. A numerical
method to estimate the Shannon entropy rate of continuous time hidden-Markov
processes from a single time series is developed.
  With this method the rate of mutual information can be determined
numerically. Moreover, an analytical upper bound on the rate of mutual
information is calculated for a class of Markov processes for which the
transition rates have a bipartite character. Our general results are
illustrated with explicit calculations for four-state networks.


title:
The ultra-long GRB 111209A - II. Prompt to afterglow and afterglow
  properties

abstract:
  The "ultra-long" Gamma Ray Burst GRB 111209A at redshift z=0.677, is so far
the longest GRB ever observed, with rest frame prompt emission duration of ~4
hours. In order to explain the bursts exceptional longevity, a low metallicity
blue supergiant progenitor has been invoked. In this work, we further
investigate this peculiar burst by performing a multi-band temporal and
spectral analysis of both the prompt and the afterglow emission. We use
proprietary and publicly available data from Swift, Konus Wind, XMM-Newton,
TAROT as well as from other ground based optical and radio telescopes. We find
some peculiar properties that are possibly connected to the exceptional nature
of this burst, namely: i) an unprecedented large optical delay of 410+/-50 s is
measured between the peak epochs of a marked flare observed also in gamma-rays
after about 2 ks from the first Swift/BAT trigger; ii) if the optical and
X-ray/gamma-ray photons during the prompt emission share a common origin, as
suggested by their similar temporal behavior, a certain amount of dust in the
circumburst environment should be introduced, with rest frame visual dust
extinction of AV=0.3-1.5 mag; iii) at the end of the X-ray "steep decay phase"
and before the start of the X-ray afterglow, we detect the presence of a hard
spectral extra power law component never revealed so far. On the contrary, the
optical afterglow since the end of the prompt emission shows more common
properties, with a flux power law decay with index alpha=1.6+/-0.1 and a late
re-brightening feature at 1.1 day. We discuss our findings in the context of
several possible interpretations given so far to the complex multi-band GRB
phenomenology. We also attempt to exploit our results to further constrain the
progenitor nature properties of this exceptionally long GRB, suggesting a
binary channel formation for the proposed blue supergiant progenitor.


title:
Seeing patterns in noise: Gigaparsec-scale `structures' that do not
  violate homogeneity

abstract:
  Clowes et al. (2013) have recently reported the discovery of a Large Quasar
Group (LQG), dubbed the Huge-LQG, at redshift z~1.3 in the DR7 quasar catalogue
of the Sloan Digital Sky Survey. On the basis of its characteristic size ~500
Mpc and longest dimension >1 Gpc, it is claimed that this structure is
incompatible with large-scale homogeneity and the cosmological principle. If
true, this would represent a serious challenge to the standard cosmological
model. However, the homogeneity scale is an average property which is not
necessarily affected by the discovery of a single large structure. I clarify
this point and provide the first fractal dimension analysis of the DR7 quasar
catalogue to demonstrate that it is in fact homogeneous above scales of at most
130 Mpc/h, which is much less than the upper limit for \Lambda CDM. In
addition, I show that the algorithm used to identify the Huge-LQG regularly
finds even larger clusters of points, extending over Gpc scales, in explicitly
homogeneous simulations of a Poisson point process with the same density as the
quasar catalogue. This provides a simple null test to be applied to any cluster
thus found in a real catalogue, and suggests that the interpretation of LQGs as
`structures' is misleading.


title: Neutrino spectral density at electroweak scale temperature

abstract:
  Motivated by the scenario of resonant leptogenesis in which lepton number
creation in the electroweak-scale is relevant, we investigate the spectral
properties and possible collective nature of the standard model neutrinos at
electroweak scale temperature (T). We adopt the R_xi gauge fixing, which
includes the unitary gauge as a limiting case, and allows us to study the
broken as well as the restored phases of the gauge symmetry in a unified way.
We show that the spectral density of the neutrino has a three-peak structure in
the low-momentum region due to the scattering with the thermally excited
particles (i.e., Landau damping) when T becomes comparable to the weak-boson
masses in the plasma. The three peaks are identified with a novel ultrasoft
mode, the usual quasiparticle, and antiplasmino modes. Varying the gauge-fixing
parameter, we show that the three-peak structure appears independently of the
gauge fixing and thus has a physical significance. We discuss possible
implications of the neutrino spectral density obtained in the present work on
particle cosmology, in particular in the context of resonant leptogenesis.


title: Stable equilibrium study cascaded one bit sigma-delta modulator

abstract:
  In the paper defines a boundary of stability zone for sigma-delta modulator.
The boundary depends from inner sigma-delta modulator coefficients. For
designing purposes such result could be used to find or compare some
appropriate schemes with each other. It is proved some statements and showed
that boundary could be found theoretically for any order of sigma-delta
modulator, but practically till 5-th order.


title:
Spontaneous evolution of self-assembled phases from anisotropic
  colloidal dispersions

abstract:
  We investigate the spontaneous evolution of various self-assembled phase
states from a homogeneous aqueous dispersion of high-aspect ratio
Montmorillonite (Na Cloisite) nanoclay platelets grounded on the observations
made over a period of 3.5 years. We have established the tw-c phase diagram for
this system for the first time in salt-free suspensions under normal pH
conditions using rheology experiments and have detected that these suspensions
do undergo nontrivial phase evolution and aging dynamics. Distinctive phase
separation, equilibrium fluid and equilibrium gels in the tw-c phase space are
discovered. Cole-Cole plots derived from rheology measurements suggested the
presence of inter connected network-like structures for c > cg, cg being the
gelation concentration. All dispersions formed stable sols during the initial
time, and with aging network-like structures were found to form via two routes:
one for c < cg, by phase separation and another for c > cg, through equilibrium
gelation. This has invoked and called for a revisit of the phase diagram of
aging MMT dispersions.

categories: cond-mat.soft cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.stat-mech


title:
Geo-Spotting: Mining Online Location-based Services for Optimal Retail
  Store Placement

abstract:
  The problem of identifying the optimal location for a new retail store has
been the focus of past research, especially in the field of land economy, due
to its importance in the success of a business. Traditional approaches to the
problem have factored in demographics, revenue and aggregated human flow
statistics from nearby or remote areas. However, the acquisition of relevant
data is usually expensive. With the growth of location-based social networks,
fine grained data describing user mobility and popularity of places has
recently become attainable.
  In this paper we study the predictive power of various machine learning
features on the popularity of retail stores in the city through the use of a
dataset collected from Foursquare in New York. The features we mine are based
on two general signals: geographic, where features are formulated according to
the types and density of nearby places, and user mobility, which includes
transitions between venues or the incoming flow of mobile users from distant
areas. Our evaluation suggests that the best performing features are common
across the three different commercial chains considered in the analysis,
although variations may exist too, as explained by heterogeneities in the way
retail facilities attract users. We also show that performance improves
significantly when combining multiple features in supervised learning
algorithms, suggesting that the retail success of a business may depend on
multiple factors.


title:
A universal equivariant finite type knot invariant defined from
  configuration space integrals

abstract:
  In a previous article, we constructed an invariant Z for null-homologous
knots in rational homology spheres, from equivariant intersections in
configuration spaces. Here we present an equivalent definition of Z in terms of
configuration space integrals, we prove that Z is multiplicative under
connected sum, and we prove null Lagrangian-preserving surgery formulae for Z.
Our formulae generalize similar formulae that are satisfied by the Kricker
rational lift of the Kontsevich integral for null Borromean surgeries. They
imply that Z is universal with respect to a natural filtration. According to
results of Garoufalidis and Rozansky, they therefore imply that Z is equivalent
to the Kricker lift of the Kontsevich integral for null-homologous knots with
trivial Alexander polynomial in integral homology spheres.


title:
Fluctuating force-coupling method for simulations of colloidal
  suspensions

abstract:
  The resolution of Brownian motion in simulations of micro-particle
suspensions can be crucial to reproducing the correct dynamics of individual
particles, as well as providing an accurate characterisation of suspension
properties. Including these effects in simulations, however, can be
computationally intensive due to the configuration dependent random
displacements that would need to be determined at every time step. In this
paper, we introduce the fluctuating force-coupling method (FCM) to overcome
this difficulty, providing a fast approach to simulate colloidal suspensions at
large-scale. We show explicitly that by forcing the surrounding fluid with a
fluctuating stress and employing the FCM framework to obtain the motion of the
particles, one obtains the random particle velocities and angular velocities
that satisfy the fluctuation-dissipation theorem. This result holds even when
higher-order multipoles, such as stresslets, are included in the FCM
approximation. Through several numerical experiments, we confirm our analytical
results and demonstrate the effectiveness of fluctuating FCM, showing also how
Brownian drift can be resolved by employing the appropriate time integration
scheme and conjugate gradient method.


title:
Refined Chern-Simons theory and (q,t)-deformed Yang-Mills theory:
  Semi-classical expansion and planar limit

abstract:
  We study the relationship between refined Chern-Simons theory on lens spaces
S^3/Z_p and (q,t)-deformed Yang-Mills theory on the sphere S^2. We derive the
instanton partition function of (q,t)-deformed U(N) Yang-Mills theory and
describe it explicitly as an analytical continuation of the semi-classical
expansion of refined Chern-Simons theory. The derivations are based on a
generalization of the Weyl character formula to Macdonald polynomials. The
expansion is used to formulate q-generalizations of beta-deformed matrix models
for refined Chern-Simons theory, as well as conjectural formulas for the
chi_y-genus of the moduli space of U(N) instantons on the surface O(-p)--->P^1
for all p which enumerate black hole microstates in refined topological string
theory. We study the large N phase structures of the refined gauge theories,
and match them with refined topological string theory on the resolved conifold.


title:
$(\varphi,\Gamma)$-modules associ\'es aux courbes hyperelliptiques
  lisses

abstract:
  In 2003, Kedlaya gave an algorithm to compute the zeta function associated to
a hyperelliptic curve over a finite field, by computing the rigid cohomology of
the curve. Edixhoven remarked that it is actually possible to compute the
crystalline cohomology of the curve, which is a lattice in the rigid
cohomology. Following a method of Wach, we first explain how to use this
lattice to compute the $(\varphi,\Gamma)$-module associated to an hyperelliptic
curve. We also explain an alternative way to get the $(\varphi,\Gamma)$-module
mod $p$ that relies on the Deligne-Illusie morphism.


title:
Transfer of orbital angular momentum of light using two component slow
  light

abstract:
  We study the manipulation of slow light with an orbital angular momentum
propagating in a cloud of cold atoms. Atoms are affected by four copropagating
control laser beams in a double tripod configuration of the atomic energy
levels involved, allowing to minimize the losses at the vortex core of the
control beams. In such a situation the atomic medium is transparent for a pair
of copropagating probe fields, leading to the creation of two-component
(spinor) slow light. We study the interaction between the probe fields when two
control beams carry optical vortices of opposite helicity. As a result, a
transfer of the optical vortex takes place from the control to the probe fields
without switching off and on the control beams. This feature is missing in a
single tripod scheme where the optical vortex can be transferred from the
control to the probe field only during either the storage or retrieval of
light.


title:
Splitting-Particle Methods for Structured Population Models: Convergence
  and Applications

abstract:
  We propose a new numerical scheme designed for a wide class of structured
population models based on the idea of operator splitting and particle
approximations. This scheme is related to the Escalator Boxcar Train (EBT)
method commonly used in biology, which is in essence an analogue of particle
methods used in physics. Our method exploits the split-up technique, thanks to
which the transport step and the nonlocal integral terms in the equation can be
separately considered. The order of convergence of the proposed method is
obtained in the natural space of finite nonnegative Radon measures equipped
with the flat metric. This convergence is studied even adding reconstruction
and approximation steps in the particle simulation to keep the number of
approximation particles under control. We validate our scheme in several test
cases showing the theoretical convergence error. Finally, we use the scheme in
situations in which the EBT method does not apply showing the flexibility of
this new method to cope with the different terms in general structured
population models.


title: Recombination rates from potential models close to the unitary limit

abstract:
  We investigate universal behavior in the recombination rate of three bosons
close to threshold. Using the He-He system as a reference, we solve the
three-body Schr\"odinger equation above the dimer threshold for different
potentials having large values of the two-body scattering length $a$. To this
aim we use the hyperspherical adiabatic expansion and we extract the $S$-matrix
through the integral relations recently derived. The results are compared to
the universal form, $\alpha\approx 67.1\sin^2[s_0\ln(\kappa_*a)+\gamma]$, for
different values of $a$ and selected values of the three-body parameter
$\kappa_*$. A good agreement with the universal formula is obtained after
introducing a particular type of finite-range corrections, which have been
recently proposed by two of the authors in Ref.[1]. Furthermore, we analyze the
validity of the above formula in the description of a very different system:
neutron-neutron-proton recombination. Our analysis confirms the universal
character of the process in systems of very different scales having a large
two-body scattering length.


title:
A study of electron recombination using highly ionizing particles in the
  ArgoNeuT Liquid Argon TPC

abstract:
  Electron recombination in highly ionizing stopping protons and deuterons is
studied in the ArgoNeuT detector. The data are well modeled by either a Birks
model or a modified form of the Box model. The dependence of recombination on
the track angle with respect to the electric field direction is much weaker
than the predictions of the Jaffe columnar theory and by
theoretical-computational simulations.


title:
The Worst Case Number of Questions in Generalized AB Game with and
  without White-peg Answers

abstract:
  The AB game is a two-player game, where the codemaker has to choose a secret
code and the codebreaker has to guess it in as few questions as possible. It is
a variant of the famous Mastermind game, with the only difference that all pegs
in both, the secret and the questions must have distinct colors. In this work,
we consider the Generalized AB game, where for given arbitrary numbers $p$, $c$
with $p \le c$ the secret code consists of $p$ pegs each having one of $c$
colors and the answer consists only of a number of black and white pegs. There
the number of black pegs equals the number of pegs matching in the
corresponding question and the secret in position and color, and the number of
white pegs equals the additional number of pegs matching in the corresponding
question and the secret only in color. We consider also a variant of the
Generalized AB game, where the information of white pegs is omitted. This
variant is called Generalized Black-peg AB game. Let $\ab(p,c)$ and $\abb(p,c)$
be the worst case number of questions for Generalized AB game and Generalized
Black-peg AB game, respectively. Combining a computer program with theoretical
considerations, we confirm known exact values of $\ab(2,c)$ and $\ab(3,c)$ and
prove tight bounds for $\ab(4,c)$. Furthermore, we present exact values for
$\abb(2,c)$ and $\abb(3,c)$ and tight bounds for $\abb(4,c)$.


title: CCS for Trees

abstract:
  CCS can be considered as a most natural extension of finite state automata in
which interaction is made possible thanks to parallel composition. We propose
here a similar extension for top-down tree automata. We introduce a parallel
composition which is parameterized by a graph at the vertices of which
subprocesses are located. Communication is allowed only between subprocesses
related by an edge in this graph. We define an observational equivalence based
on barbs as well as weak bisimilarity equivalence and prove an adequacy theorem
relating these two notions.


title: Initial \lambda-compactness in linearly ordered spaces

abstract:
  We show that a linearly ordered topological space is initially
\lambda-compact if and only if it is \lambda-bounded, that is, every set of
cardinality $\leq \lambda$ has compact closure. As a consequence, every product
of initially \lambda-compact linearly ordered topological spaces is initially
\lambda-compact.


title:
Fast greedy algorithm for subspace clustering from corrupted and
  incomplete data

abstract:
  We describe the Fast Greedy Sparse Subspace Clustering (FGSSC) algorithm
providing an efficient method for clustering data belonging to a few
low-dimensional linear or affine subspaces. The main difference of our
algorithm from predecessors is its ability to work with noisy data having a
high rate of erasures (missed entries with the known coordinates) and errors
(corrupted entries with unknown coordinates). We discuss here how to implement
the fast version of the greedy algorithm with the maximum efficiency whose
greedy strategy is incorporated into iterations of the basic algorithm.
  We provide numerical evidences that, in the subspace clustering capability,
the fast greedy algorithm outperforms not only the existing state-of-the art
SSC algorithm taken by the authors as a basic algorithm but also the recent
GSSC algorithm. At the same time, its computational cost is only slightly
higher than the cost of SSC.
  The numerical evidence of the algorithm significant advantage is presented
for a few synthetic models as well as for the Extended Yale B dataset of facial
images. In particular, the face recognition misclassification rate turned out
to be 6-20 times lower than for the SSC algorithm. We provide also the
numerical evidence that the FGSSC algorithm is able to perform clustering of
corrupted data efficiently even when the sum of subspace dimensions
significantly exceeds the dimension of the ambient space.


title:
Up to four planets around the M dwarf GJ 163. Sensitivity of Bayesian
  planet detection criteria to prior choice

abstract:
  Exoplanet Doppler surveys are currently the most efficient means to detect
low-mass companions to nearby stars. Among these stars, the light M dwarfs
provide the highest sensitivity to detect low-mass exoplanet candidates.
Evidence is accumulating that a substantial fraction of these low-mass planets
are found in high-multiplicity planetary systems. GJ 163 is a nearby inactive M
dwarf with abundant public observations obtained using the HARPS spectrograph.
We obtain and analyse radial velocities from the HARPS public spectra of GJ 163
and investigate the presence of a planetary companions orbiting it. The number
of planet candidates detected might depend on some prior assumptions. Since the
impact of prior choice has not been investigated throughly previously, we study
the effects of different prior densities on the detectability of planet
candidates around GJ 163. We use Bayesian tools, i.e. posterior samplings and
model comparisons, when analysing the GJ 163 velocities. We consider models
accounting for the possible correlations of subsequent measurements. We also
search for activity-related counterparts of the signals we observe and test the
dynamical stability of the planetary systems corresponding to our solutions
using direct numerical integrations of the orbits. We find that there are at
least three planet candidates orbiting GJ 163. The existence of a fourth planet
is supported by the data but the evidence in favor of the corresponding model
is not yet conclusive. The second innermost planet candidate in the system with
an orbital period of 25.6 days and a minimum mass of 8.7 Me is inside the
liquid-water habitable zone of the star.


title:
Shape Outlier Detection and Visualization for Functional Data: the
  Outliergram

abstract:
  We propose a new method to visualize and detect shape outliers in samples of
curves. In functional data analysis we observe curves defined over a given real
interval and shape outliers are those curves that exhibit a different shape
from the rest of the sample. Whereas magnitude outliers, that is, curves that
exhibit atypically high or low values at some points or across the whole
interval, are in general easy to identify, shape outliers are often masked
among the rest of the curves and thus difficult to detect. In this article we
exploit the relation between two depths for functional data to help visualizing
curves in terms of shape and to develop an algorithm for shape outlier
detection. We illustrate the use of the visualization tool, the outliergram,
through several examples and asses the performance of the algorithm on a
simulation study. We apply them to the detection of outliers in a children
growth dataset in which the girls sample is contaminated with boys curves and
viceversa.


title: Calibration and High Fidelity Measurement of a Quantum Photonic Chip

abstract:
  Integrated quantum photonic circuits are becoming increasingly complex.
Accurate calibration of device parameters and detailed characterization of the
prepared quantum states are critically important for future progress. Here we
report on an effective experimental calibration method based on Bayesian
updating and Markov chain Monte Carlo integration. We use this calibration
technique to characterize a two qubit chip and extract the reflectivities of
its directional couplers. An average quantum state tomography fidelity of
93.79+/-1.05% against the four Bell states is achieved. Furthermore, comparing
the measured density matrices against a model using the non-ideal device
parameters derived from the calibration we achieve an average fidelity of
97.57+/-0.96%. This pinpoints non-ideality of chip parameters as a major factor
in the decrease of Bell state fidelity. We also perform quantum state
tomography for Bell states while continuously varying photon distinguishability
and find excellent agreement with theory.


title:
Passage time and fluctuation calculations for subexponential L\'evy
  processes

abstract:
  We consider the passage time problem for L\'evy processes, emphasising heavy
tailed cases. Results are obtained under quite mild assumptions, namely, drift
to $-\infty$ a.s. of the process, possibly at a linear rate (the finite mean
case), but possibly much faster (the infinite mean case), together with
subexponential growth on the positive side. Local and functional versions of
limit distributions are derived for the passage time itself, as well as for the
position of the process just prior to passage, and the overshoot of a high
level. A significant connection is made with extreme value theory via regular
variation or maximum domain of attraction conditions imposed on the positive
tail of the canonical measure, which are shown to be necessary for the kind of
convergence behaviour we are interested in.


title:
Short-Time Existence of the Second Order Renormalization Group Flow in
  Dimension Three

abstract:
  Given a compact three-manifold together with a Riemannian metric, we prove
the short-time existence of a solution to the renormalization group flow,
truncated at the second order term, under a suitable hypothesis on the
sectional curvature of the initial metric.


title:
Chemical evolution of Local Group dwarf galaxies in a cosmological
  context -- I. A new modelling approach and its application to the Sculptor
  dwarf spheroidal galaxy

abstract:
  We present a new approach for chemical evolution modelling, specifically
designed to investigate the chemical properties of dwarf galaxies in a full
cosmological framework. In particular, we focus on the Sculptor dwarf
spheroidal galaxy as a test bed for our model. We select four candidate
Sculptor-like galaxies from the satellite galaxy catalogue generated by
implementation of a version of the Munich semi-analytic model for galaxy
formation on the level 2 Aquarius dark matter simulations. We follow explicitly
the evolution of several chemical elements, both in the cold gas out of which
the stars form and in the hot medium residing in the halo. We take into account
in detail the lifetimes of stars of different initial masses, the distribution
of the delay times for type Ia supernova explosions and the dependency of the
stellar yields from the initial metallicity of the stars. We allow large
fractions of metals to be deposited into the hot phase, either directly as
stars die or through reheated gas flows powered by supernova explosions. In
order to reproduce both the observed metallicity distribution function and the
observed abundance ratios of long-lived stars of Sculptor, large fractions of
the reheated metals must never re-enter regions of active star formation. Our
analysis sets further constraints on the semi-analytical models and, at large,
on possible metal enrichment scenarios for the Sculptor dwarf spheroidal
galaxy.


title: Querying over Federated SPARQL Endpoints ---A State of the Art Survey

abstract:
  The increasing amount of Linked Data and its inherent distributed nature have
attracted significant attention throughout the research community and amongst
practitioners to search data, in the past years. Inspired by research results
from traditional distributed databases, different approaches for managing
federation over SPARQL Endpoints have been introduced. SPARQL is the
standardised query language for RDF, the default data model used in Linked Data
deployments and SPARQL Endpoints are a popular access mechanism provided by
many Linked Open Data (LOD) repositories. In this paper, we initially give an
overview of the federation framework infrastructure and then proceed with a
comparison of existing SPARQL federation frameworks. Finally, we highlight
shortcomings in existing frameworks, which we hope helps spawning new research
directions.


title:
Weighted norm inequalities for multisublinear maximal operator in
  martingale spaces

abstract:
  Let $v,~\omega_1, ~\omega_2$ be weights and $1<p_1, ~p_2<\infty.$ Suppose
that $\frac{1}{p}=\frac{1}{p_1}+\frac{1}{p_2}$ and $(\omega_1, \omega_2)\in
RH(p_1, p_2).$ For the multisublinear maximal operator $\mathfrak{M}$ in
martingale spaces, we characterize the weights for which $\mathfrak{M}$ is
bounded from $L^{p_1}(\omega_1)\times L^{p_2}(\omega_2)$ to
$L^{p,\infty}(v)\hbox{or}L^p(v).$ If
$v=\omega_2^{\frac{p}{p_2}}\omega_2^{\frac{p}{p_2}},$ we partially give the
bilinear version of one-weight theory.


title: Two-step estimation of a multivariate L\'evy process

abstract:
  Based on the concept of a L\'evy copula to describe the dependence structure
of a multivariate L\'evy process we present a new estimation procedure. We
consider a parametric model for the marginal L\'evy processes as well as for
the L\'evy copula and estimate the parameters by a two-step procedure. We first
estimate the parameters of the marginal processes, and then estimate in a
second step only the dependence structure parameter. For infinite L\'evy
measures we truncate the small jumps and base our statistical analysis on the
large jumps of the model. Prominent example will be a bivariate stable \lp,
which allows for analytic calculations and, hence, for a comparison of
different methods. We prove asymptotic normality of the parameter estimates
from the two-step procedure and, in particular, we derive the Godambe
information matrix, whose inverse is the covariance matrix of the normal limit
law. A simulation study investigates the loss of efficiency because of the
two-step procedure and the truncation.


title: Orbital caloritronic transport in strongly interacting quantum dots

abstract:
  We discuss out-of-equilibrium population imbalances between different orbital
states due to applied thermal gradients. This purely thermoelectric orbital
effect appears quite generically in nanostructures with a pseudospin degree of
freedom. We establish an orbital Seebeck coefficient that characterizes the
induced orbital bias in response to a temperature difference between reservoirs
coupled to a quantum conductor. We analyze a two-terminal strongly interacting
quantum dot with two orbital states and find that the orbital thermopower acts
as an excellent tool to describe the transition between SU(4) and SU(2) Kondo
physics. Our conclusions are reinforced from a detailed comparison with the
charge thermopower using numerical renormalization group calculations.


title:
Linear combinations of univalent harmonic mappings convex in the
  direction of the imaginary axis

abstract:
  In the present paper, we introduce a family of univalent harmonic functions,
which map the unit disk onto domains convex in the direction of the imaginary
axis. We find conditions for the linear combinations of mappings from this
family to be univalent and convex in the direction of the imaginary axis.
Linear combinations of functions from this family and harmonic mappings
obtained by shearing of analytic vertical strip maps are also studied.


title:
On the computation of moments of the partial non-central chi-squared
  distribution function

abstract:
  Properties satisfied by the moments of the partial non-central chi-square
distribution function, also known as Nuttall Q-functions, and methods for
computing these moments are discussed in this paper. The Nuttall Q-function is
involved in the study of a variety of problems in different fields, as for
example digital communications.


title:
Probing the fast outflow in IRAS 15452-5459 with ATCA observations of
  OH, H2O, and SiO masers

abstract:
  Maser lines of OH, H2 O, and SiO are commonly observed in O-rich AGB stars,
but their presence after the end of the Asymptotic Giant Branch (AGB) phase is
linked to non-spherical mass-loss processes. IRAS 15452-5459 is a post-AGB star
with an hourglass nebula whose maser lines are quite peculiar. We observed all
of the three maser species with the Australia Telescope Compact Array with
angular resolutions of 6'' , 0.6'' , 0.3'' , and 1.7'' at 18 cm, 13 mm, 7 mm,
and 3 mm, respectively. While double peaks are routinely seen in OH and water
masers and interpreted as due to expanding envelopes, only very few sources
display SiO lines with a similar spectral profile. Our observations confirm the
detection of the double peak of SiO at 86 GHz; the same spectral shape is seen
in the lower-J maser at 43 GHz. A double peak is also detected in the water
line, which covers the same velocity range as the SiO masers. Thermally excited
lines of SiO are detected at 7 and 3 mm and span the same velocity range as the
maser lines of this species. Although observations at higher angular resolution
are desirable to further investigate the spatial distributions of the maser
spots, the current data allow us to conclude that the SiO masers are
distributed in an hourglass shape and are likely due to the sputtering of dust
grains caused by shock propagation. The complex OH profile would instead be due
to emission from the fast outflow and an orthogonal structure.


title: A Conceptual Metadata Framework for Spatial Data Warehouse

abstract:
  Metadata represents the information about data to be stored in Data
Warehouses.It is a mandatory element of Data Warehouse to build an efficient
Data Warehouse.Metadata helps in data integration,lineage,data quality and
populating transformed data into data warehouse.Spatial data warehouses are
based on spatial data mostly collected from Geographical Information
Systems(GIS)and the transactional systems that are specific to an application
or enterprise.Metadata design and deployment is the most critical phase in
building of data warehouse where it is mandatory to bring the spatial
information and data modeling together.In this paper,we present a holistic
metadata framework that drives metadata creation for spatial data warehouse.
Theoretically, the proposed metadata framework improves the efficiency of
accessing of data in response to frequent queries on SDWs.In other words, the
proposed framework decreases the response time of the query and accurate
information is fetched from Data Warehouse including the spatial information.


title: Regular chains of star formation complexes in spiral arms of NGC 628

abstract:
  We investigate photometric properties of spiral arms and stellar
complexes/associations inside these arms in the grand design NGC 628 (M74)
galaxy.We analyze GALEX ultraviolet, optical UBVRI, and H-alpha? surface
photometry data, including those obtained with 1.5 m telescope at the Maidanak
Observatory. In the longer arm, the large and bright stellar complexes are
located at regular intervals along the arm, but only farther from the galaxy
center. They are joined with the narrow lane of dust, visible only in the
infrared bands. The usual dust lane along the stellar arm inner side is seen
there only at distances closer to the galaxy center. It is well expressed in CO
(H_2) image. We have found, that the second, short arm hosts two dust lanes,
the strong and wide at the inner side, and narrow and irregular along its outer
edge. This outer dust lane is well seen in IR images only. The shorter arm
contains no star complexes at all. Gradients of age and luminosity of stars
across both arms are missing (again excepting the parts of arms located closer
to the center), which is confirmed by our photometric cuts across both arms.
The drastic difference in the morphology of the two symmetric arms (grand
design type) of a galaxy has now been confirmed by objective measurements in
the case of M74. It is unclear why about two third of galaxies with beaded arms
host these "beads" (star complexes) in one arm only.


title: The weak radiative pion vertex in \tau^- ->\pi^-\nu_\tau l^+ l^- decays

abstract:
  We carry out a detailed study of the branching fractions and lepton pair
invariant-mass spectrum of \tau^- ->\pi^- \nu_\tau l^+l^- decays (l=e,\mu). In
addition to the model-independent (QED) contributions, we include the
structure-dependent (SD) terms, which encode information on the hadronization
of QCD currents. The form factors describing the SD contributions are evaluated
by supplementing Chiral Perturbation Theory with the inclusion of the lightest
multiplet of spin-one resonances as active degrees of freedom. The Lagrangian
couplings have been determined demanding the known QCD short-distance behaviour
to the relevant Green functions and associated form factors in the limit where
the number of colours goes to infinity. As a result, we predict BR(\tau^-
->\pi^-\nu_\tau e^+e^-)= (1.7^{+1.1}_{-0.3})x10^{-5} and BR(\tau^- ->
\pi^-\nu_\tau \mu^+\mu^-) = [0.03,1.0]x10^{-5}. According to this, the first
decay could be measured in the near future, which is not granted for the second
one.


title: A model for the orbital modulation of PSR J0737-3039B

abstract:
  A model was constructed to explain the orbit modulation of PSR J0737-3039B
(referred to as B), which included the following suppositions: (1) B has
arrived at the aged period and generally cannot emit observable light; (2) The
PSR J0737-3039A (referred to as A) is dynamic and is encircled by dense charged
particles. When A revolves along its orbit, some of the particles are scattered
and form a particle cloud band along its orbit; (3) When passing the two
intersection points of the orbits, B goes through the cloud band and drives the
cloud particles to emit light; (4) Generally, B passes twice through the cloud
band every orbit cycle; hence, there are two bright phases along the orbit. (5)
It is the complexities of the distribution of the cloud particles and B's
emission region that cause the bright phases to drift away from the orbit
intersections. We also provide two predictions for the coming performance of B
to test our model.


title: Non-perturbative effects and the refined topological string

abstract:
  The partition function of ABJM theory on the three-sphere has
non-perturbative corrections due to membrane instantons in the M-theory dual.
We show that the full series of membrane instanton corrections is completely
determined by the refined topological string on the Calabi-Yau manifold known
as local P1xP1, in the Nekrasov-Shatashvili limit. Our result can be
interpreted as a first-principles derivation of the full series of
non-perturbative effects for the closed topological string on this Calabi-Yau
background. Based on this, we make a proposal for the non-perturbative free
energy of topological strings on general, local Calabi-Yau manifolds.


title: Proton-proton diffractive collisions at ultra-high energies

abstract:
  Proton-proton total and elastic cross sections are considered in the
Dakhno-Nikonov eikonal model [L.G. Dakhno, V.A. Nikonov, Eur. Phys. J. A8, 209
(1999)] at ultra-high energies. The model takes into account the quark
structure of hadrons and the gluon structure of the supercritical pomeron that
results in colour screening. The pomeron is considered as an input interaction
term. The model gives a reasonably good description of the preLHC and LHC data
for $pp$ collisions with a growth of the type $\ln^2s$ for total and elastic
cross sections and $(\tau={\bf q}_\perp^2\ln^2s)$-scaling for diffractive
scattering. We present parameters of the supercritical pomeron and provide
predictions for the energy region $\sqrt{s}\sim 10^2-10^4$ TeV.


title: Density-feedback control in traffic and transport far from equilibrium

abstract:
  A bottleneck situation in one-lane traffic-flow is typically modelled with a
constant demand of entering cars. However, in practice this demand may depend
on the density of cars in the bottleneck. The present paper studies a simple
bimodal realization of this mechanism to which we refer to as density-feedback
control (DFC): If the actual density in the bottleneck is above a certain
threshold, the reservoir density of possibly entering cars is reduced to a
different constant value. By numerical solution of the discretized viscid
Burgers equation a rich stationary phase diagram is found. In order to maximize
the flow, which is the goal of typical traffic-management strategies, we find
the optimal choice of the threshold. Analytical results are verified by
computer simulations of the microscopic TASEP with DFC.


title:
A flexible algorithm for calculating pair interactions on SIMD
  architectures

abstract:
  Calculating interactions or correlations between pairs of particles is
typically the most time-consuming task in particle simulation or correlation
analysis. Straightforward implementations using a double loop over particle
pairs have traditionally worked well, especially since compilers usually do a
good job of unrolling the inner loop. In order to reach high performance on
modern CPU and accelerator architectures, single-instruction multiple-data
(SIMD) parallelization has become essential. Avoiding memory bottlenecks is
also increasingly important and requires reducing the ratio of memory to
arithmetic operations. Moreover, when pairs only interact within a certain
cut-off distance, good SIMD utilization can only be achieved by reordering
input and output data, which quickly becomes a limiting factor. Here we present
an algorithm for SIMD parallelization based on grouping a fixed number of
particles, e.g. 2, 4, or 8, into spatial clusters. Calculating all interactions
between particles in a pair of such clusters improves data reuse compared to
the traditional scheme and results in a more efficient SIMD parallelization.
Adjusting the cluster size allows the algorithm to map to SIMD units of various
widths. This flexibility not only enables fast and efficient implementation on
current CPUs and accelerator architectures like GPUs or Intel MIC, but it also
makes the algorithm future-proof. We present the algorithm with an application
to molecular dynamics simulations, where we can also make use of the effective
buffering the method introduces.


title: Effective noise channels for encoded quantum systems

abstract:
  We investigate effective noise channels for encoded quantum systems with and
without active error correction. Noise acting on physical qubits forming a
logical qubit is thereby described as a logical noise channel acting on the
logical qubits, which leads to a significant decrease of the effective system
dimension. This provides us with a powerful tool to study entanglement features
of encoded quantum systems. We demonstrate this framework by calculating lower
bounds on the lifetime of distillable entanglement and the negativity for
encoded multipartite qubit states with different encodings. At the same time,
this approach leads to a simple understanding of the functioning of
(concatenated) error correction codes.


title:
Spontaneous symmetry breaking in synchronously pumped fiber ring
  cavities

abstract:
  We introduce a new equation that describes the spatio-temporal evolution of
arbitrary pulses propagating in a fiber-ring cavity. This model is a
significant extension of the traditionally used Lugiato-Lefever model. We
demonstrate spontaneous symmetry breaking as well as multistability regimes in
a synchronously pumped fiber-ring cavity. The equation can be applied to
virtually any type of waveguide-based ring cavity.


title: HTTPI Based Web Service Security over SOAP

abstract:
  Now a days, a new family of web applications open applications, are emerging
(e.g., Social Networking, News and Blogging). Generally, these open
applications are non-confidential. The security needs of these applications are
only client/server authentication and data integrity. For securing these open
applications, effectively and efficiently, HTTPI, a new transport protocol is
proposed, which ensures the entire security requirements of open applications.
Benefit of using the HTTPI is that it is economical in use, well-suited for
cache proxies, like HTTP is, and provides security against many Internet
attacks (Server Impersonation and Message Modification) like HTTPS does. In
terms of performance HTTPI is very close to the HTTP, but much better than
HTTPS. A Web service is a method of communication between two ends over the
Internet. These web services are developed over XML and HTTP. Today, most of
the open applications use web services for most of their operations. For
securing these web services, security design based on HTTPI is proposed. Our
work involves securing the web services over SOAP, based on the HTTPI. This
secure web service might be applicable for open applications, where
authentication and integrity is needed, but no confidentiality required. In our
paper, we introduce a web service security model based on HTTPI protocol over
SOAP and develop a preliminary implementation of this model. We also analyze
the performance of our approach through an experiment and show that our
proposed approach provides higher throughput, lower average response time and
lower response size than HTTPS based web service security approach.


title: Bethe Ansaetze for GKP strings

abstract:
  Studying the scattering of excitations around a dynamical background has a
long history in the context of integrable models. The Gubser-Klebanov-Polyakov
string solution provides such a background for the string/gauge correspondence.
Taking the conjectured all-loop asymptotic equations for the AdS_4/CFT_3
correspondence as the starting point, we derive the S-matrix and a set of
spectral equations for the lowest-lying excitations. We find that these
equations resemble closely the analogous equations for AdS_5/CFT_4, which are
also discussed in this paper. At large values of the coupling constant we show
that they reproduce the Bethe equations proposed to describe the spectrum of
the low-energy limit of the AdS_4xCP^3 sigma model.


title:
Off-diagonal Bethe ansatz solution of the XXX spin-chain with arbitrary
  boundary conditions

abstract:
  With the off-diagonal Bethe ansatz method proposed recently by the present
authors, we exactly diagonalize the $XXX$ spin chain with arbitrary boundary
fields. By constructing a functional relation between the eigenvalues of the
transfer matrix and the quantum determinant, the associated $T-Q$ relation and
the Bethe ansatz equations are derived.

categories: math-ph cond-mat.stat-mech hep-th math.MP


title:
Performing Informetric Analysis on Information Retrieval Test
  Collections: Preliminary Experiments in the Physics Domain

abstract:
  The combination of informetric analysis and information retrieval allows a
twofold application. (1) While in-formetrics analysis is primarily used to gain
insights into a scientific domain, it can be used to build recommen-dation or
alternative ranking services. They are usually based on methods like
co-occurrence or citation analyses. (2) Information retrieval and its
decades-long tradition of rigorous evaluation using standard document corpora,
predefined topics and relevance judgements can be used as a test bed for
informetric analyses. We show a preliminary experiment on how both domains can
be connected using the iSearch test collection, a standard information
retrieval test collection derived from the open access arXiv.org preprint
server. In this paper the aim is to draw a conclusion about the appropriateness
of iSearch as a test bed for the evaluation of a retrieval or recommendation
system that applies informetric methods to improve retrieval results for the
user. Based on an interview study with physicists, bibliographic coupling and
author-co-citation analysis, important authors for ten different research
questions are identified. The results show that the analysed corpus includes
these authors and their corresponding documents. This study is a first step
towards a combination of retrieval evaluations and the evaluation of
informetric analyses methods.


title: On the value set of small families of polynomials over a finite field, I

abstract:
  We obtain an estimate on the average cardinality of the value set of any
family of monic polynomials of Fq[T] of degree d for which s consecutive
coefficients a_{d-1},..., a_{d-s} are fixed. Our estimate holds without
restrictions on the characteristic of Fq and asserts that
V(d,s,\bfs{a})=\mu_d.q+\mathcal{O}(1), where V(d,s,\bfs{a}) is such an average
cardinality, \mu_d:=\sum_{r=1}^d{(-1)^{r-1}}/{r!} and \bfs{a}:=(a_{d-1},..,
d_{d-s}). We provide an explicit upper bound for the constant underlying the
\mathcal{O}--notation in terms of d and s with "good" behavior. Our approach
reduces the question to estimate the number of Fq--rational points with
pairwise--distinct coordinates of a certain family of complete intersections
defined over Fq. We show that the polynomials defining such complete
intersections are invariant under the action of the symmetric group of
permutations of the coordinates. This allows us to obtain critical information
concerning the singular locus of the varieties under consideration, from which
a suitable estimate on the number of Fq--rational points is established.


title: 6D microstate geometries from 10D structures

abstract:
  We use the formalism of Generalised Geometry to characterise in general the
supersymmetric backgrounds in type II supergravity that have a null Killing
vector. We then specify this analysis to configurations that preserve the same
supersymmetries as the D1-D5-P system compactified on a four-manifold. We give
a set of equations on the forms defining the supergravity background that are
equivalent to the supersymmetry constraints and the equations of motion. This
study is motivated by the search of new microstate geometries for the D1-D5-P
black hole. As an example, we rewrite the linearised three-charge solution of
arXiv:hep-th/0311092 in our formalism and show how to extend it to a
non-linear, regular and asymptotically flat configuration.


title: Condition Driven Adaptive Music Generation for Computer Games

abstract:
  The video game industry has grown to a multi-billion dollar, worldwide
industry. The background music tends adaptively in reference to the specific
game content during the game length of the play. Adaptive music should be
further explored by looking at the particular condition in the game; such
condition is driven by generating a specific music in the background which best
fits in with the active game content throughout the length of the gameplay.
This research paper outlines the use of condition driven adaptive music
generation for audio and video to dynamically incorporate adaptively.


title: Spin-Chiral Bulk Fermi Surfaces of BiTeI Proven by Quantum Oscillations

abstract:
  We present the Fermi-surface map of the spin-chiral bulk states for the
non-centrosymmetric semiconductor BiTeI using de Haas-van Alphen and
Shubnikov-de Haas oscillations. We identify two distinct Fermi surfaces with a
unique spindle-torus-type topology and the non-trivial Berry phases, confirming
the spin chirality with oppositely circulating spin-texture. Near the quantum
limit at high magnetic fields, we find a substantial Zeeman effect with an
effective g-factor of ~ 60 for the Rashba-split Fermi surfaces. These findings
provide clear evidence of strong Rashba and Zeeman coupling in the bulk states
of BiTeI, suggesting that BiTeI is a good platform hosting the spin-polarized
chiral states.


title:
On the Initial-Boundary Problem for the Time-Fractional Diffusion
  Equation in the Quarter Plane

abstract:
  Taking into account the asymptotic behavior of some Wright functions and the
existence of bounds for the Mainardi and the Wright function
$W(-x,\frac{\alpha}{2}, 1)$ in $\mathbb{R}^+$ , three different
initial-boundary-value problems for the time-fractional diffusion equation in
the quarter plane, where the time-fractional derivative is taken in the Caputo
sense of order $\alpha$ $\in (0,1)$ are solved. Moreover, the limit when
$\alpha \nearrow 1$ of the respective solutions are analyzed, recovering the
respective solutions of the classical boundary-value problems when $\alpha=1$
and the fractional diffusion equation becomes the heat equation.


title: Parity Odd Domain Structure with Generalized $\theta$ Vacuum

abstract:
  Recent experiments in heavy ion collisions have shown the possibility of
creating parity-odd domains resulting from the $\theta$ term in strong
interaction Lagrangian. The $\theta$ term originates from the nontrivial
solution of QCD vacuum known as the $\theta$ vacuum, and the value of $\theta$
is taken to be a function of spacetime coordinates in the parity-odd domains.
This means that we have to consider different theories at each point so that we
need to devise a new approach to define the QCD vacuum. In this Letter, we
suggest a method to generalize the $\theta$ vacuum by exploiting the dimension
2 condensates and to calculate the parity-odd domain structure as the union of
gauge slices defined by the constant value of dimension 2 condensate.


title:
Two equivalent Stefan's problems for the Time Fractional Diffusion
  Equation

abstract:
  Two Stefan's problems for the diffusion fractional equation are solved, where
the fractional derivative of order $ \al \in (0,1) $ is taken in the Caputo's
sense. The first one has a constant condition on $ x = 0 $ and the second
presents a flux condition $ T_x (0, t) = \frac {q} {t ^ {\al/2}} $. An
equivalence between these problems is proved and the convergence to the
classical solutions is analysed when $ \al \nearrow $ 1 recovering the heat
equation with its respective Stefan's condition.


title:
Toward the Performance vs. Feedback Tradeoff for the Two-User MISO
  Broadcast Channel

abstract:
  For the two-user MISO broadcast channel with imperfect and delayed channel
state information at the transmitter (CSIT), the work explores the tradeoff
between performance on the one hand, and CSIT timeliness and accuracy on the
other hand. The work considers a broad setting where communication takes place
in the presence of a random fading process, and in the presence of a feedback
process that, at any point in time, may provide CSIT estimates - of some
arbitrary accuracy - for any past, current or future channel realization. This
feedback quality may fluctuate in time across all ranges of CSIT accuracy and
timeliness, ranging from perfectly accurate and instantaneously available
estimates, to delayed estimates of minimal accuracy. Under standard
assumptions, the work derives the degrees-of-freedom (DoF) region, which is
tight for a large range of CSIT quality. This derived DoF region concisely
captures the effect of channel correlations, the accuracy of predicted,
current, and delayed-CSIT, and generally captures the effect of the quality of
CSIT offered at any time, about any channel.
  The work also introduces novel schemes which - in the context of imperfect
and delayed CSIT - employ encoding and decoding with a phase-Markov structure.
The results hold for a large class of block and non-block fading channel
models, and they unify and extend many prior attempts to capture the effect of
imperfect and delayed feedback. This generality also allows for consideration
of novel pertinent settings, such as the new periodically evolving feedback
setting, where a gradual accumulation of feedback bits progressively improves
CSIT as time progresses across a finite coherence period.


title:
Appropriation as neglected practice in communities: presenting a
  framework to enable EUD design for CoPs

abstract:
  Communities present considerable challenges for the design and application of
supportive information technology (IT), especially when these develop in
loosely-integrated, informal and scarcely organized contexts, like it is often
the case of Communities of Practice (CoP). An approach that actively supports
user communities in the process of IT appropriation can help alleviate the
impossibility of the members of these communities to rely on professional
support, and enable even complex forms of tailoring and End-User Development
(EUD). Although this approach has been already explored by an increasing number
of researchers, however there is still a lack of a general framework that could
play a role in the comparison of existing proposals and in the development of
new EUD solutions for CoPs. The paper proposes a conceptual framework and a
related architecture, called Logic of Bricolage, that aims to be a step further
in this direction to enable better EUD-oriented support for digitized
communities. The framework is described and the architecture instantiated in
three concrete EUD environments that specifically regard collaborative
activities in order to show the generality and applicability of the framework.


title: Charged Spaces

abstract:
  A charged space is a space equipped with two distinct base points. Such
spaces arise as the unreduced suspension of an unbased space. More generally,
one can work in the fiberwise setting over a fixed space B. A fiberwise charged
space over B is a space X equipped with map to B and having two sections. One
can ask whether or not a fiberwise charged space over B is a fiberwise
suspension. We answer this question in a certain metastable range by producing
a necessary and sufficient obstruction. As an application we show how this can
be used to study when an embedding into a smooth manifold of the form N x I
compresses to an embedding into N .


title:
Efficient and accurate algorithms for the computation and inversion of
  the incomplete gamma function ratios

abstract:
  Algorithms for the numerical evaluation of the incomplete gamma function
ratios $P(a,x)=\gamma(a,x)/\Gamma(a)$ and $Q(a,x)=\Gamma(a,x)/\Gamma(a)$ are
described for positive values of $a$ and $x$. Also, inversion methods are given
for solving the equations $P(a,x)=p$, $Q(a,x)=q$, with $0<p,q<1$. Both the
direct computation and the inversion of the incomplete gamma function ratios
are used in many problems in statistics and applied probability. The analytical
approach from earlier literature is summarized and new initial estimates are
derived for starting the inversion algorithms. The performance of the
associated software to our algorithms (the Fortran 90 module {\bf IncgamFI}) is
analyzed and compared with earlier published algorithms.


title:
Coherent control at its most fundamental: CEP-dependent electron
  localization in photodissoziation of a H2+ molecular ion beam target

abstract:
  Measurements and calculations of the absolute carrier-envelope phase (CEP)
effects in the photodissociation of the simplest molecule, H2+, with a 4.5-fs
Ti:Sapphire laser pulse at intensities up to (4 +- 2)x10^14 Watt/cm^2 are
presented. Localization of the electron with respect to the two nuclei (during
the dissociation process) is controlled via the CEP of the ultra-short laser
pulses. In contrast to previous CEP-dependent experiments with neutral
molecules, the dissociation of the molecular ions is not preceded by a
photoionization process, which strongly influences the CEP dependence.
Kinematically complete data is obtained by time- and position-resolved
coincidence detection. The phase dependence is determined by a single-shot
phase measurement correlated to the detection of the dissoziation fragments.
The experimental results show quantitative agreement with ab inito 3D-TDSE
calculations that include nuclear vibration and rotation.


title:
Two-color narrowband photon pair source with high brightness based on
  clustering in a monolithic waveguide resonator

abstract:
  We report on an integrated non-degenerate narrowband photon pair source
produced at 890 nm and 1320nm via type II parametric down-conversion in a
periodically poled waveguide with high-reflective dielectric mirrors deposited
on the waveguide end faces. The conversion spectrum consists of three clusters
and only 3 to 4 longitudinal modes with about 150 MHz bandwidth in each
cluster. The high conversion efficiency in the waveguide, together with the
spectral clustering in the double resonator, leads to a high brightness of
$3\times10^3~$pairs/(s$\cdot$mW$\cdot$MHz). The compact and rugged monolithic
design makes the source a versatile device for various applications in quantum
communication.


title:
The Epeak-Eiso relation revisited with Fermi GRBs: Resolving a
  long-standing debate?

abstract:
  We used a sample of GRBs detected by Fermi and Swift to reanalyze the
correlation discovered by Amati et al. (2002) between Epi, the peak energy of
the prompt GRB emission, and Eiso, the energy released by the GRB assuming
isotropic emission. This correlation has been disputed by various authors, and
our aim is to assess whether it is an intrinsic GRB property or the consequence
of selection effects. We constructed a sample of Fermi GRBs with homogeneous
selection criteria, and we studied their distribution in the Epi-Eiso plane.
Our sample is made of 43 GRBs with a redshift and 243 GRBs without a redshift.
We show that GRBs with a redshift follow a broad Epi-Eiso relation, while GRBs
without a redshift show several outliers. We use these samples to discuss the
impact of selection effects associated with GRB detection and with redshift
measurement. We find that the Epi-Eiso relation is partly due to intrinsic GRB
properties and partly due to selection effects. The lower right boundary of the
Epi-Eiso relation stems from a true lack of luminous GRBs with low Epi. In
contrast, the upper left boundary is attributed to selection effects acting
against the detection GRBs with low Eiso and large Epi that appear to have a
lower signal-to-noise ratio. In addition, we demonstrate that GRBs with and
without a redshift follow different distributions in the Epi-Eiso plane. GRBs
with a redshift are concentrated near the lower right boundary of the Epi-Eiso
relation. This suggests that it is easier to measure the redshift of GRBs close
to the lower Epi-Eiso boundary. In this context, we attribute the controversy
about the reality of the Amati relation to the complex nature of this relation
resulting from the combination of a true physical boundary and biases favoring
the detection and the measurement of the redshift of GRBs located close to this
boundary.


title: A DSATUR-based algorithm for the Equitable Coloring Problem

abstract:
  This paper describes a new exact algorithm for the Equitable Coloring
Problem, a coloring problem where the sizes of two arbitrary color classes
differ in at most one unit. Based on the well known DSatur algorithm for the
classic Coloring Problem, a new pruning criterion arising from equity
constraints is proposed and analyzed. The good performance of the algorithm is
shown through computational experiments over random and benchmark instances.


title: The geometry of Euclidean surfaces with conical singularities

abstract:
  The geometry of closed surfaces equipped with a Euclidean metric with
finitely many conical points of arbitrary angle is studied. The main result is
that the image of a non-closed geodesic has 0 distance from the set of conical
points. Dynamical properties for the space of geodesics are also proved.


title: Supergravity Solutions of Two M2 Branes

abstract:
  We present an exact analytic class of solutions for a system of two membranes
in eleven-dimensional supergravity. One brane in the system is completely
localized along the overall and relative transverse coordinates while the other
brane in the system is localized only along the overall transverse coordinates.
The membrane configuration preserves four supersymmetries. Moreover we find
some approximate solutions for the system of two membranes with a Bianchi space
as the overall transverse space to both membranes. All supergravity solutions
preserve 1/8 of the supersymmetry. Upon dimensional reduction, the solutions
provide intersecting configurations of three D-branes in type IIA supergravity.


title: Dichotomy Results for the L1 Norm of the Discrepancy Function

abstract:
  It is a well-known conjecture in the theory of irregularities of distribution
that the L1 norm of the discrepancy function of an N-point set satisfies the
same asymptotic lower bounds as its L^2 norm. In dimension d=2 this fact has
been established by Halasz, while in higher dimensions the problem is wide
open. In this note, we establish a series of dichotomy-type results which state
that if the L^1 norm of the discrepancy function is too small (smaller than the
conjectural bound), then the discrepancy function has to be large in some other
function space.


title:
Highly frustrated magnetism in SrHo2O4: Coexistence of two types of
  short-range order

abstract:
  SrHo2O4 is a geometrically frustrated magnet in which the magnetic Ho3+ ions
form honeycomb layers connected through a network of zigzag chains. At
low-temperature two distinct types of short-range magnetic order can be
inferred from single crystal diffraction data, collected using both polarized
and unpolarized neutrons. In the (hk0) plane the diffuse scattering is most
noticeable around the k = 0 positions and its intensity rapidly increases at
temperatures below 0.7 K. In addition, planes of diffuse scattering at Q = (hk
+/- l/2) are visible at temperatures as high as 4.5 K. These planes coexist
with the broad peaks of diffuse scattering in the (hk0) plane at
low-temperatures. Correlation lengths associated with the broad peaks are L ~
150 {\AA} in the a-b plane and L ~ 190 {\AA} along c axis, while the
correlation length associated with the diffuse scattering planes is L ~ 230
{\AA} along the c axis at the lowest temperature. Both types of diffuse
scattering are elastic in nature. The highly unusual coexistance of the two
types of diffuse scattering in SrHo2O4 is likely to be the result of the
presence of two crystallographically inequivalent sites for Ho3+ in the unit
cell.


title: Bipartite graphs are weak antimagic

abstract:
  The \emph{Antimagic Graph Conjecture} asserts that every connected graph $G =
(V, E)$ except $K_2$ admits an edge labeling such that each label $1, 2, ...,
|E|$ is used exactly once and the sums of the labels on all edges incident with
a given node are distinct. We study an associated counting function (replacing
the upper bound on the possible labels by a variable) and prove that a variant
of this counting function, when we do not require the labels to be distinct, is
a polynomial if $G$ is bipartite. As a consequence, we show that every
connected bipartite graph $G = (V, E)$ except $K_2$ admits a \emph{weakly}
antimagic labeling, that is, each edge label is among $1, 2, ..., |E|$
(repetition allowed) and the sums of the labels on all edges incident with a
given node are distinct. We also present a natural extension of these results
to directed and bidirected graphs; this extension gives rise to a (bi-)directed
version of the Antimagic Graph Conjecture, which might be of independent
interest.


title: Simulating regoliths in microgravity

abstract:
  Despite their very low surface gravities, the surfaces of asteroids and
comets are covered by granular materials - regolith - that can range from a
fine dust to a gravel-like structure of varying depths. Understanding the
dynamics of granular materials is, therefore, vital for the interpretation of
the surface geology of these small bodies and is also critical for the design
and/or operations of any device planned to interact with their surfaces. We
present the first measurements of transient weakening of granular material
after shear reversal in microgravity as well as a summary of experimental
results recently published in other journals, which may have important
implications for small-body surfaces. Our results suggest that the force
contact network within a granular material may be weaker in microgravity,
although the influence of any change in the contact network is felt by the
granular material over much larger distances. This could mean that small body
surfaces are even more unstable than previously imagined. However, our results
also indicate that the consequences of, e.g., a meteorite impact or a
spacecraft landing, may be very different depending on the impact angle and
location, and depending on the prior history of the small body surface.


title: Emission-line stars in the LMC: the Armagh survey, and a metacatalogue

abstract:
  [Aims] Accurate astrometry is required to reliably cross-match 20th-century
photographic catalogues against 21st-century digital surveys. The present work
provides modern-era identifications and astrometry for the 801 emission-line
objects "of stellar appearance" in the Armagh survey (the largest of its nature
to date). [Methods] Targets have been individually identified in digital images
using the Armagh Atlas and, in most cases, unambiguously matched to entries in
the UCAC astrometric catalogues. [Results] Astrometry with sub-arcsecond
precision is now available for all the major photographic spectroscopic surveys
of the LMC. The results are used to compile an annotated metacatalogue of 1675
individual, spectroscopically identified candidate H-alpha-emission stars,
including detailed cross-matching between catalogues, and resolving many
(though not all) identification ambiguities in individual primary sources.


title: Estimates of the Discrepancy Function in Exponential Orlicz Spaces

abstract:
  We prove that in all dimensions n at least 3, for every integer N there
exists a distribution of points of cardinality $ N$, for which the associated
discrepancy function D_N satisfies the estimate an estimate, of sharp growth
rate in N, in the exponential Orlicz class exp)L^{2/(n+1)}. This has recently
been proved by M.~Skriganov, using random digit shifts of binary digital nets,
building upon the remarkable examples of W.L.~Chen and M.~Skriganov. Our
approach, developed independently, complements that of Skriganov.


title: A remark about the spectral radius

abstract:
  We show that for any finitely generated non-amenable group and any
$\varepsilon>0$, there exists some finite symmetric generating set with
spectral radius less than $\varepsilon$. We give applications to percolation
theory and the theory of operator spaces.


title: A Major Asymmetric Dust Trap in a Transition Disk

abstract:
  The statistics of discovered exoplanets suggest that planets form
efficiently. However, there are fundamental unsolved problems, such as
excessive inward drift of particles in protoplanetary disks during planet
formation. Recent theories invoke dust traps to overcome this problem. We
report the detection of a dust trap in the disk around the star Oph IRS 48
using observations from the Atacama Large Millimeter/submillimeter Array
(ALMA). The 0.44-millimeter-wavelength continuum map shows high-contrast
crescent-shaped emission on one side of the star originating from
millimeter-sized grains, whereas both the mid-infrared image (micrometer-sized
dust) and the gas traced by the carbon monoxide 6-5 rotational line suggest
rings centered on the star. The difference in distribution of big grains versus
small grains/gas can be modeled with a vortex-shaped dust trap triggered by a
companion.


title:
Measuring the Impact of Adversarial Errors on Packet Scheduling
  Strategies

abstract:
  In this paper we explore the problem of achieving efficient packet
transmission over unreliable links with worst case occurrence of errors. In
such a setup, even an omniscient offline scheduling strategy cannot achieve
stability of the packet queue, nor is it able to use up all the available
bandwidth. Hence, an important first step is to identify an appropriate metric
for measuring the efficiency of scheduling strategies in such a setting. To
this end, we propose a relative throughput metric which corresponds to the long
term competitive ratio of the algorithm with respect to the optimal. We then
explore the impact of the error detection mechanism and feedback delay on our
measure. We compare instantaneous error feedback with deferred error feedback,
that requires a faulty packet to be fully received in order to detect the
error. We propose algorithms for worst-case adversarial and stochastic packet
arrival models, and formally analyze their performance. The relative throughput
achieved by these algorithms is shown to be close to optimal by deriving lower
bounds on the relative throughput of the algorithms and almost matching upper
bounds for any algorithm in the considered settings. Our collection of results
demonstrate the potential of using instantaneous feedback to improve the
performance of communication systems in adverse environments.


title: On Auslander-Reiten sequences for Borel-Schur algebras

abstract:
  We classify Borel-Schur algebras having finite representation type. We also
de- termine Auslander-Reiten sequences for a large class of simple modules over
Borel- Schur algebras. A partial information on the structure of the socles of
Borel-Schur algebras is given.


title: Generalized solutions for the sum of two maximally monotone operators

abstract:
  A common theme in mathematics is to define generalized solutions to deal with
problems that potentially do not have solutions. A classical example is the
introduction of least squares solutions via the normal equations associated
with a possibly infeasible system of linear equations. In this paper, we
introduce a "normal problem" associated with finding a zero of the sum of two
maximally monotone operators. If the original problem admits solutions, then
the normal problem returns this same set of solutions. The normal problem may
yield solutions when the original problem does not admit any; furthermore, it
has attractive variational and duality properties. Several examples illustrate
our theory.


title:
Are Happy Developers more Productive? The Correlation of Affective
  States of Software Developers and their self-assessed Productivity

abstract:
  For decades now, it has been claimed that a way to improve software
developers' productivity is to focus on people. Indeed, while human factors
have been recognized in Software Engineering research, few empirical
investigations have attempted to verify the claim. Development tasks are
undertaken through cognitive processing abilities. Affective states - emotions,
moods, and feelings - have an impact on work-related behaviors, cognitive
processing activities, and the productivity of individuals. In this paper, we
report an empirical study on the impact of affective states on software
developers' performance while programming. Two affective states dimensions are
positively correlated with self-assessed productivity. We demonstrate the value
of applying psychometrics in Software Engineering studies and echo a call to
valorize the human, individualized aspects of software developers. We introduce
and validate a measurement instrument and a linear mixed-effects model to study
the correlation of affective states and the productivity of software
developers.


title:
Making Sense out of a Jungle of JavaScript Frameworks: towards a
  Practitioner-friendly Comparative Analysis

abstract:
  The field of Web development is entering the HTML5 and CSS3 era and
JavaScript is becoming increasingly influential. A large number of JavaScript
frameworks have been recently promoted. Practitioners applying the latest
technologies need to choose a suitable JavaScript framework (JSF) in order to
abstract the frustrating and complicated coding steps and to provide a
cross-browser compatibility. Apart from benchmark suites and recommendation
from experts, there is little research helping practitioners to select the most
suitable JSF to a given situation. The few proposals employ software metrics on
the JSF, but practitioners are driven by different concerns when choosing a
JSF. As an answer to the critical needs, this paper is a call for action. It
proposes a re-search design towards a comparative analysis framework of JSF,
which merges researcher needs and practitioner needs.


title: A critique of recent theories of spin half quantum plasmas

abstract:
  In this Letter certain fundamental physics issues relating to recent theories
of so-called `spin quantum plasmas' are examined. It is shown that the
derivations and some of the results obtained in these theories contradict
well-established principles of quantum mechanics, especially in their treatment
of fermions and spin. The analysis presented suggests that the aforementioned
theories do not apply for any range of temperatures at the stated densities and
furthermore fail to make any experimentally accessible and testable
predictions.


title: A low temperature analysis of the boundary driven Kawasaki Process

abstract:
  Low temperature analysis of nonequilibrium systems requires finding the
states with the longest lifetime and that are most accessible from other
states. We determine these dominant states for a one-dimensional diffusive
lattice gas subject to exclusion and with nearest neighbor interaction. They do
not correspond to lowest energy configurations even though the particle current
tends to zero as the temperature reaches zero. That is because the dynamical
activity that sets the effective time scale, also goes to zero with
temperature. The result is a non-trivial asymptotic phase diagram, which
crucially depends on the interaction coupling and the relative chemical
potentials of the reservoirs.