title:
Mass hierarchy discrimination with atmospheric neutrinos in large volume
  ice/water Cherenkov detectors

abstract:
  Large mass ice/water Cherenkov experiments, optimized to detect low energy
(1-20 GeV) atmospheric neutrinos, have the potential to discriminate between
normal and inverted neutrino mass hierarchies. The sensitivity depends on
several model and detector parameters, such as the neutrino flux profile and
normalization, the Earth density profile, the oscillation parameter
uncertainties, and the detector effective mass and resolution. A proper
evaluation of the mass hierarchy discrimination power requires a robust
statistical approach. In this work, the Toy Monte Carlo, based on an extended
unbinned likelihood ratio test statistic, was used. The effect of each model
and detector parameter, as well as the required detector exposure, was then
studied. While uncertainties on the Earth density and atmospheric neutrino flux
profiles were found to have a minor impact on the mass hierarchy
discrimination, the flux normalization, as well as some of the oscillation
parameter (\Delta m^2_{31}, \theta_{13}, \theta_{23}, and \delta_{CP})
uncertainties and correlations resulted critical. Finally, the minimum required
detector exposure, the optimization of the low energy threshold, and the
detector resolutions were also investigated.


title:
Probing the leptonic Dirac CP-violating phase in neutrino oscillation
  experiments

abstract:
  The discovery of leptonic CP violation is one of the primary goals of
next-generation neutrino oscillation experiments, which is feasible due to the
recent measurement of a relatively large leptonic mixing angle \theta_{13}. We
suggest two new working observables \Delta A^{\rm m}_{\alpha \beta} \equiv
\max[A^{\rm CP}_{\alpha \beta}(\delta)] - \min[A^{\rm CP}_{\alpha
\beta}(\delta)] and \Delta A^{\rm CP}_{\alpha \beta}(\delta) \equiv A^{\rm
CP}_{\alpha \beta}(\delta) - A^{\rm CP}_{\alpha \beta}(0) to describe the
CP-violating effects in long-baseline and atmospheric neutrino oscillation
experiments. The former signifies the experimental sensitivity to the leptonic
Dirac CP-violating phase $\delta$ and can be used to optimize the experimental
setup, while the latter measures the intrinsic leptonic CP violation and can be
used to extract $\delta$ directly from the experimental observations. Both
analytical and numerical analyses are carried out to illustrate their main
features. It turns out that an intense neutrino beam with sub-GeV energies and
a baseline of a few 100 km may serve as an optimal experimental setup for
probing leptonic CP violation.


title: Deriving program transformations by demonstration

abstract:
  Automatic code transformation in which transformations are tuned for specific
applications and contexts are difficult to achieve in an accessible manner. In
this paper, we present an approach to build application specific code
transformations. Our approach is based on analysis of the abstract syntax
representation of exemplars of the essential change to the code before and
after the transformation is applied. This analysis entails a sequence of steps
to identify the change, determine how to generalize it, and map it to term
rewriting rules for the Stratego term rewriting system. The methods described
in this paper assume programs are represented in a language-neutral term
format, allowing tools based on our methods to be applied to programs written
in the major languages used by computational scientists utilizing high
performance computing systems.


title:
Optimal bilinear control of nonlinear Schr\"{o}dinger equations with
  singular potentials

abstract:
  In this paper, we consider an optimal bilinear control problem for the
nonlinear Schr\"{o}dinger equations with singular potentials. We show
well-posedness of the problem and existence of an optimal control. In addition,
the first order optimality system is rigorously derived. Our results generalize
the ones in \cite{Sp} in several aspects.


title:
On the gradient estimates for evolution operators associated to
  Kolmogorov operators

abstract:
  We determine sufficient conditions for the occurrence of a pointwise gradient
estimate for the evolution operators associated to nonautonomous second order
parabolic operators with (possibly) unbounded coefficients. Moreover we exhibit
a class of operators which satisfy our conditions.


title: A Novel Digital Watermarking Algorithm using Random Matrix Image

abstract:
  The availability of bandwidth for internet access is sufficient enough to
communicate digital assets. These digital assets are subjected to various types
of threats. [19] As a result of this, protection mechanism required for the
protection of digital assets is of priority in research. The threat of current
focus is unauthorized copying of digital assets which give boost to piracy.
This under the copyright act is illegal and a robust mechanism is required to
curb this kind of unauthorized copy. To safeguard the copyright digital assets,
a robust digital watermarking technique is needed. The existing digital
watermarking techniques protect digital assets by embedding a digital watermark
into a host digital image. This embedding does induce slight distortion in the
host image but the distortion is usually too small to be noticed. At the same
time the embedded watermark must be robust enough to with stand deliberate
attacks. There are various techniques of digital watermarking but researchers
are making constant efforts to increase the robustness of the watermark image.
The layered approach of watermarking based on Huffman coding [5] can soon
increase the robustness of digital watermark.[11] Ultimately, increasing the
security of copyright of protection. The proposed work is in similar direction
where in RMI (Random Matrix Image) is used in place of Huffman coding. This
innovative algorithm has considerably increased the robustness in digital
watermark while also enhancing security of production


title: Quasi-valuations - topology and the weak approximation theorem

abstract:
  Suppose $F$ is a field with a nontrivial valuation $v$ and valuation ring
$O_{v}$, $E$ is a finite field extension and $w$ is a quasi-valuation on $E$
extending $v$. We study the topology induced by $w$. We prove that the
quasi-valuation ring determines the topology, independent of the choice of its
quasi-valuation. Moreover, we prove the weak approximation theorem for
quasi-valuations.


title: Atmospheric Neutrino Oscillations in IceCube

abstract:
  We present the results of an analysis of data collected by IceCube/DeepCore
in 2010-2011 resulting in the first significant detection of neutrino
oscillations in a high-energy neutrino telescope. A low-energy muon neutrino
sample (20-100 GeV) containing the oscillation signal was extracted from data
collected by DeepCore. A high-energy muon neutrino sample (100 GeV -10 TeV) was
extracted from IceCube data in order to constrain the systematic uncertainties.
The non-oscillation hypothesis was rejected with more than $5\sigma$. We fitted
the oscillation parameters $\Delta m^2_{23}$ and $\sin^22 \theta_{23}$ to these
data samples. In a 2-flavor formalism we find $\Delta m^2_{23}=
(2.5\pm0.6)\cdot10^{-3}$ eV$^2$ and $\sin^22 \theta_{23}>0.92$ while maximum
mixing is favored. These results are in good agreement with the world average
values.


title: Maximal covers of chains of prime ideals

abstract:
  Suppose $f:S \rightarrow R$ is a ring homomorphism such that $f[S] $ is
contained in the center of $R$. We study the connections between chains in
$\text{Spec} (S)$ and chains in $\text{Spec} (R)$. We focus on the properties
LO (lying over), INC (incomparability), GD (going down), GU (going up) and SGB
(strong going between). %we define the notion $\mathcal D$-chain which is a
chain $\mathcal C \subseteq \text{Spec} (S)$ such that for all $Q \in \mathcal
C$, $f^{-1}[Q] \in \mathcal D$. We provide a sufficient condition for every
maximal chain in $\text{Spec} (R)$ to cover a maximal chain in $\text{Spec}
(S)$. We prove some necessary and sufficient conditions for $f$ to satisfy each
of the properties GD, GU and SGB, in terms of maximal $\mathcal D$-chains,
where $\mathcal D \subseteq \text{Spec} (S)$ is a nonempty chain. We show that
if $f$ satisfies all of the properties above, then every maximal $\mathcal
D$-chain is a perfect maximal cover of $\mathcal D$. Our main result is
Corollary \ref{equivalent conditions}, in which we give equivalent conditions
for the following property: for every chain $\mathcal D \subseteq {\text Spec}
(S)$ and for every maximal $\mathcal D$-chain $\mathcal C \subseteq {\text
Spec} (R)$, $\mathcal C$ and $\mathcal D$ are of the same cardinality.


title:
Covariant equations of motion for test bodies in gravitational theories
  with general nonminimal coupling

abstract:
  We present a covariant derivation of the equations of motion for test bodies
for a wide class of gravitational theories with nonminimal coupling,
encompassing a general interaction via the complete set of 9 parity-even
curvature invariants. The equations of motion for spinning test bodies in such
theories are explicitly derived by means of Synge's expansion technique. Our
findings generalize previous results in the literature and allow for a direct
comparison to the general relativistic equations of motion of pole-dipole test
bodies.


title:
On the discontinuous second-order deviated Dirichlet problem with
  non-monotone conditions

abstract:
  We provide a new result on the existence of extremal solutions for
second-order Dirichlet problems with deviation argument. As a novelty in this
work, the nonlinearity need not be continuous or monotone. In order to obtain
this new result, we use a generalized monotone method coupled with lower and
upper solutions.


title:
Predicting the electronic structure of weakly interacting hybrid
  systems: The example of nanosized pea-pod structures

abstract:
  We provide a simple scheme for predicting the electronic structure of
van-der-Waals bound systems, based on the mere knowledge of the electronic
structure of the subunits. We demonstrate this with the example of
nano-peapods, consisting of polythiophene encapsulated in single-wall carbon
nanotubes. Using density functional theory we disentangle the contributions to
the level alignment. The main contribution is shown to be given by the
ionization potential of the polymer inside the host, which, in turn is
determined by the curvature of the tube. Only a small correction arises from
charge redistributions within the domains of the constituents. Polarization
effects turn out to be minor due to the cylindrical geometry of the peapods and
their dielectric characteristics. Our findings open a perspective towards
designing opto-electronic properties of such complex materials.


title: Pure rotational spectra of TiO and TiO_2 in VY Canis Majoris

abstract:
  We report the first detection of pure rotational transitions of TiO and TiO_2
at (sub-)millimeter wavelengths towards the red supergiant VY CMa. A rotational
temperature, T_rot, of about 250 K was derived for TiO_2. Although T_rot was
not well constrained for TiO, it is likely somewhat higher than that of TiO_2.
The detection of the Ti oxides confirms that they are formed in the
circumstellar envelopes of cool oxygen-rich stars and may be the "seeds" of
inorganic-dust formation, but alternative explanations for our observation of
TiO and TiO_2 in the cooler regions of the envelope cannot be ruled out at this
time. The observations suggest that a significant fraction of the oxides is not
converted to dust, but instead remains in the gas phase throughout the outflow.


title: Nucleation and growth of thin films of rod--like conjugated molecules

abstract:
  Thin films formed from small molecules rapidly gain importance in different
technological fields. To explain their growth, methods developed for
zero--dimensional atoms as the film forming particles are applied. However, in
organic thin film growth the dimensionality of the building blocks comes into
play. Using the special case of the model molecule para--Sexiphenyl, we will
emphasize the challenges that arise from the anisotropic and one--dimensional
nature of building blocks. Differences or common features with other rodlike
molecules will be discussed. The typical morphologies encountered for this
group of molecules and the relevant growth modes will be investigated. Special
attention is given to the transition between flat lying and upright orientation
of the building blocks during nucleation. We will further discuss methods to
control the molecular orientation and describe the involved diffusion processes
qualitatively and quantitatively.


title:
Interaction of discrete nonlinear Schr\"odinger solitons with a linear
  lattice impurity

abstract:
  The interaction of moving discrete solitons with a linear Gaussian defect is
investigated. Solitons with profiles varying from hyperbolic secant to
exponentially localized are considered such that the mobility of soliton is
maintained; the condition for which is obtained. Studies on scattering of the
soliton by an attractive defect potential reveal the existence of total
reflection and transmission windows which become very narrow with increasing
initial soliton amplitude. Transmission regions disappear beyond the
small-amplitude limit. The regions of complete reflection and partial capture
correspond to the windows of the existence and nonexistence of solution of the
stationary problem. Interaction of the discrete soliton with a barrier
potential is also investigated. The critical amplitude of the defect at which
splitting of the soliton into two parts occurs was estimated from a balance
equation. The results were confirmed through direct numerical integration of
the dynamical equation showing very good agreement with the analytical
prediction.

categories: nlin.PS cond-mat.other cond-mat.quant-gas physics.atom-ph physics.optics


title:
On the theory of superconductivity in the extended Hubbard model:
  Spin-fluctuation pairing

abstract:
  A microscopic theory of superconductivity in the extended Hubbard model which
takes into account the intersite Coulomb repulsion and electron-phonon
interaction is developed in the limit of strong correlations. The Dyson
equation for normal and pair Green functions expressed in terms of the Hubbard
operators is derived. The self-energy is obtained in the noncrossing
approximation. In the normal state, antiferromagnetic short-range correlations
result in the electronic spectrum with a narrow bandwidth. We calculate
superconducting Tc by taking into account the pairing mediated by charge and
spin fluctuations and phonons. We found the d-wave pairing with high-Tc
mediated by spin fluctuations induced by the strong kinematic interaction for
the Hubbard operators. Contributions to the d-wave pairing coming from the
intersite Coulomb repulsion and phonons turned out to be small.


title: LHC and the strongly-interacting extensions of the Standard Model

abstract:
  This was a plenary talk at the 19th Conference of Slovak Physicists reviewing
the status, consequences, and prospects of the 125-GeV boson discovery. To
illustrate a possible impact of the discovery on the strongly-interacting
extensions of the Standard Model the preliminary results of the analysis of the
top-BESS effective model with the 125-GeV scalar boson added were shown. The
complete analysis has appeared recently in arxiv:1301.2124.


title: Finite difference method for a fractional porous medium equation

abstract:
  We formulate a numerical method to solve the porous medium type equation with
fractional diffusion \[\frac{\partial u}{\partial t}+(-\Delta)^{1/2} (u^m)=0.\]
The problem is posed in $x\in \mathbb{R}^N$, $m\geq 1$ and with nonnegative
initial data. The fractional Laplacian is implemented via the so-called
Caffarelli-Silvestre extension. We prove existence and uniqueness of the
solution of this method and also the convergence to the theoretical solution of
the equation. We run numerical experiments on typical initial data.


title:
Micromagnetism in (001) magnetite by spin-polarized low-energy electron
  microscopy

abstract:
  Spin-polarized low-energy electron microscopy was used to image a magnetite
crystal with (100) surface orientation. Sets of spin-dependent images of
magnetic domain patterns observed in this surface were used to map the
direction of the magnetization vector with high spatial and angular resolution.
We find that domains are magnetized along the surface [110] directions, and
domain wall structures include 90{\deg} and 180{\deg} walls. A type of
unusually curved domain walls are interpreted as N\'eel-capped surface
terminations of 180{\deg} Bloch walls.


title:
Applying machine learning techniques to improve user acceptance on
  ubiquitous environement

abstract:
  Ubiquitous information access becomes more and more important nowadays and
research is aimed at making it adapted to users. Our work consists in applying
machine learning techniques in order to adapt the information access provided
by ubiquitous systems to users when the system only knows the user social
group, without knowing anything about the user interest. The adaptation
procedures associate actions to perceived situations of the user. Associations
are based on feedback given by the user as a reaction to the behavior of the
system. Our method brings a solution to some of the problems concerning the
acceptance of the system by users when applying machine learning techniques to
systems at the beginning of the interaction between the system and the user.


title:
On complexity of envelopes of piecewise linear functions, unions and
  intersections of polygons

abstract:
  We prove tight upper bounds for the number of vertices of a simple polygon
that is the union or the intersection of two simple polygons with given numbers
of convex and concave vertices. The similar question on graphs of the lower (or
upper) envelope of two continuous piecewise linear functions is considered.


title:
Control of dynamical instability in semiconductor quantum nanostructures
  diode lasers: role of phase-amplitude coupling

abstract:
  We numerically investigate the complex nonlinear dynamics for two
independently coupled laser systems consisting of (i) mutually delay-coupled
edge emitting diode lasers and (ii) injection-locked quantum nano-structures
lasers. A comparative study in dependence on the dynamical role of alpha
parameter, which determine the phase-amplitude coupling of the optical field,
in both the cases is probed. The variation of alpha lead to conspicuous changes
in the dynamics of both the systems, which are characterized and investigated
as a function of optical injection strength for the fixed coupled-cavity delay
time. Our analysis is based on the observation that the cross-correlation and
bifurcation measures unveil the signature of enhancement of amplitude-death
islands in which the coupled lasers mutually stay in stable phase-locked
states. In addition, we provide a qualitative understanding of the physical
mechanisms underlying the observed dynamical behavior and its dependence on
alpha. The amplitude death and the existence of multiple amplitude death
islands could be implemented for applications including diode lasers
stabilization.


title:
Valence Band Circular Dichroism in non-magnetic Ag/Ru(0001) at normal
  emission

abstract:
  For the non-magnetic system of Ag films on Ru(0001), we have measured the
circular dichroism of photoelectrons emitted along the surface normal, the
geometry typically used in photoemission electron microscopy (PEEM).
Photoemission spectra were acquired from micrometer-sized regions having
uniformly thick Ag films on a single, atomically flat Ru terrace. For a single
Ag layer, we find a circular dichroism that exceeds 6% at the d-derived band
region around 4.5 eV binding energy. The dichroism decreases as the Ag film
thickness increases to three atomic layers. We discuss the origin of the
circular dichroism in terms of the symmetry lowering that can occur even in
normal emission.


title:
Tautomerism in liquid 1,2,3-triazole: a combined Energy-Dispersive X-Ray
  Diffraction, Molecular Dynamics and FTIR study

abstract:
  In this work, we report a multitechnique (energy-dispersive X-Ray
diffraction, computational methods and FT-IR spectroscopy) study of the
tautomeric equilibrium of 1,2,3-triazole, one of the few small
nitrogen-containing eterocycles liquid at room temperature. The T-2H form (C2v
symmetry) is found to be strongly favored in gas and solid phases, whereas the
neat liquid gives diffraction patterns that can be interpreted satisfactorily
with the structure functions calculated from some molecular dynamics results
for both T-2H and T-1H tautomers, although the T-2H form gives a slightly
better agreement.


title:
A new approach towards the self-adaptability of Service-Oriented
  Architectures to the context based on workflow

abstract:
  Distributed information systems are needed to be autonomous, heterogeneous
and adaptable to the context. This is the reason why they resort Web services
based on SOA Based on the advanced technology of SOA. These technologies can
evolve in a dynamic environment in a well-defined context and according to
events automatically, such as time, temperature, location, authentication,
etc... This is what we call self-adaptability to context. In this paper, we are
interested in improving the different needs of this criterion and we propose a
new approach towards a self-adaptability of SOA to the context based on
workflow and showing the feasibility of this approach by integration the
workflow under a platform and test this integration by a case study.


title: Real-space study of the growth of magnesium on ruthenium

abstract:
  The growth of magnesium on ruthenium has been studied by low-energy electron
microscopy (LEEM) and scanning tunneling microscopy (STM). In LEEM, a
layer-by-layer growth is observed except in the first monolayer, where the
completion of the first layer in inferred by a clear peak in electron
reflectivity. Desorption from the films is readily observable at 400 K.
Real-space STM and low-energy electron diffraction confirm that sub-monolayer
coverage presents a moir\'e pattern with a 1.2 nm periodicity, which evolves
with further Mg deposition by compressing the Mg layer to a 2.2 nm periodicity.
Layer-by-layer growth is followed in LEEM up to 10 ML. On films several ML
thick a substantial density of stacking faults are observed by dark-field
imaging on large terraces of the substrate, while screw dislocations appear in
the stepped areas. The latter are suggested to result from the mismatch in
heights of the Mg and Ru steps. Quantum size effect oscillations in the
reflected LEEM intensity are observed as a function of thickness, indicating an
abrupt Mg/Ru interface.


title:
Redshift-drift as a test for discriminating between decelerating
  inhomogeneous and accelerating universe models

abstract:
  Exact inhomogeneous solutions of Einstein's equations have been used in the
literature to build models reproducing the cosmological data without dark
energy. However, owing to the degrees of freedom pertaining to these models, it
is necessary to get rid of the degeneracy often exhibited by the problem of
distinguishing between them and accelerating universe models. We give an
overview of redshift drift in inhomogeneous cosmologies, and explain how it
serves to this purpose. One class of models which fits the data is the Szekeres
Swiss-cheese class where non-spherically symmetric voids exhibit a typical size
of about 400 Mpc. We present our calculation of the redshift drift in this
model, and compare it with the results obtained by other authors for alternate
scenarios.


title:
A note on some summations due to Ramanujan, their generalization and
  some allied series

abstract:
  In this short note, we aim to discuss some summations due to Ramanujan, their
generalizations and some allied series


title: Fluid Limits for Bandwidth-Sharing Networks with Rate Constraints

abstract:
  Bandwidth-sharing networks as introduced by Massouli\'e & Roberts (1998)
model the dynamic interaction among an evolving population of elastic flows
competing for several links. With policies based on optimization procedures,
such models are of interest both from a Queueing Theory and Operations Research
perspective.
  In the present paper, we focus on bandwidth-sharing networks with capacities
and arrival rates of a large order of magnitude compared to transfer rates of
individual flows. This regime is standard in practice. In particular, we extend
previous work by Reed & Zwart (2010) on fluid approximations for such networks:
we allow interarrival times, flow sizes and patient times (i.e. abandonment
times measured from the arrival epochs) to be generally distributed, rather
than exponentially distributed. We also develop polynomial-time computable
fixed-point approximations for stationary distributions of bandwidth-sharing
networks, and suggest new techniques for deriving these types of results.


title:
Centrality determination of Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ =
  2.76 TeV with ALICE

abstract:
  This publication describes the methods used to measure the centrality of
inelastic Pb-Pb collisions at a center-of-mass energy of 2.76 TeV per colliding
nucleon pair with ALICE. The centrality is a key parameter in the study of the
properties of QCD matter at extreme temperature and energy density, because it
is directly related to the initial overlap region of the colliding nuclei.
Geometrical properties of the collision, such as the number of participating
nucleons and number of binary nucleon-nucleon collisions, are deduced from a
Glauber model with a sharp impact parameter selection, and shown to be
consistent with those extracted from the data. The centrality determination
provides a tool to compare ALICE measurements with those of other experiments
and with theoretical calculations.


title: Random Fluid Limit of an Overloaded Polling Model

abstract:
  In the present paper, we study the evolution of an overloaded cyclic polling
model that starts empty. Exploiting a connection with multitype branching
processes, we derive fluid asymptotics for the joint queue length process.
Under passage to the fluid dynamics, the server switches between the queues
infinitely many times in any finite time interval causing frequent oscillatory
behavior of the fluid limit in the neighborhood of zero. Moreover, the fluid
limit is random. Additionally, we suggest a method that establishes finiteness
of moments of the busy period in an M/G/1 queue.


title: Influences of Topological Defect on Spin Hall Effect

abstract:
  We study the influence of topological defect on the spin current as well as
the spin Hall effect. We find that the nontrivial deformation of the space-time
due to topological defect can generate a spin dependent current which then
induces an imbalanced accumulation of spin states on the edges of sample. The
corresponding spin-Hall conductivity has also been calculated for the
topological defect of a cosmic string. Comparing to the ordinary value, a
correction which is linear with mass density of the cosmic string appears. Our
approach to the dynamics of non-relativistic spinor in the presence of a
topological defect is based on the Foldy-Wouthuysen transformation. The spin
current is obtained in by using the extended Drude model which is independent
of the scattering mechanism.


title: Isospin transport in 84Kr + 112,124Sn collisions at Fermi energies

abstract:
  Isotopically resolved fragments with Z<=20 have been studied with high
resolution telescopes in a test run for the FAZIA collaboration. The fragments
were produced by the collision of a 84Kr beam at 35 MeV/nucleon with a n-rich
(124Sn) and a n-poor (112Sn) target. The fragments, detected close to the
grazing angle, are mainly emitted from the phase-space region of the
projectile. The fragment isotopic content clearly depends on the n-richness of
the target and it is a direct evidence of isospin diffusion between projectile
and target. The observed enhanced neutron richness of light fragments emitted
from the phase-space region close to the center of mass of the system can be
interpreted as an effect of isospin drift in the diluted neck region.


title:
Electronic structure and quantum criticality in
  Ba(Fe$_{1-x-y}$Co$_{x}$Mn$_{y}$)$_{2}$As$_{2}$, an ARPES study

abstract:
  We used angle-resolved photoemission spectroscopy (ARPES) and density
functional theory calculations to study the electronic structure of
Ba(Fe1-x-yCoxMny)2As2 for x=0.06 and 0<=y <=0.07. From ARPES we derive that the
substitution of Fe by Mn does not lead to hole doping, indicating a
localization of the induced holes. An evaluation of the measured spectral
function does not indicate a diverging effective mass or scattering rate near
optimal doping. Thus the present ARPES results indicate a continuous evolution
of the quasiparticle interaction and therefore question previous quantum
critical scenarios.


title: Globular clusters seen by Gaia

abstract:
  We present a simulation of twelve globular clusters with different
concentration, distance, and background population, whose properties are
transformed into Gaia observables with the help of the lates Gaia science
performances prescriptions. We adopt simplified crowding receipts, based on
five years of simulations performed by DPAC (Data Processing and Analysis
Consortium) scientists, to explore the effect of crowding and to give a basic
idea of what will be made possible by Gaia in the field of Galactic globular
clusters observations.


title:
p-adic interpolation function related to multiple generalized Genocchi
  numbers

abstract:
  In the present paper, we deal with multiple generalized Genocchi numbers and
polynomials. Also, we introduce analytic interpolating function for the
multiple generalized Genocchi numbers attached to \c{hi} at negative integers
in complex plane and we define the multiple Genocchi p-adic L-function.
Finally, we derive the value of the partial derivative of our multiple p-adic
l-function at s=0.


title:
Multi-component dark matter with magnetic moments for Fermi-LAT
  gamma-ray line

abstract:
  We propose a model of multi-component dark matter with magnetic moments to
explain the 130 GeV gamma-ray line hinted by the Fermi-LAT data. Specifically,
we consider a U(1)_X dark sector which contains two vector-like fermions
besides the related gauge and Higgs fields. A very heavy messenger scalar is
further introduced to construct the Yukawa couplings of the dark fermions to
the heavy [SU(2)]-singlet leptons in the SU(3)_c \times SU(2)_L \times SU(2)_R
\times U(1)_{B-L} left-right symmetric models for universal seesaw. A heavier
dark fermion with a very long lifetime can mostly decay into a lighter dark
fermion and a photon at one-loop level. The dark fermions can serve as the dark
matter particles benefited from their annihilations into the dark gauge and
Higgs fields. In the presence of a U(1) kinetic mixing, the dark matter
fermions can be verified by the ongoing and forthcoming dark matter direct
detection experiments.


title: Rank gradient of small covers

abstract:
  We prove that if $M \longrightarrow P$ is a small cover of a compact
right-angled hyperbolic polyhedron $P$ then $M$ admits a cofinal tower of
finite sheeted covers with positive rank gradient. As a corollary, if
$\pi_1(M)$ is commensurable with the reflection group of $P$, then $M$ admits a
cofinal tower of finite sheeted covers with positive rank gradient.


title:
A note on comonotonicity and positivity of the control components of
  decoupled quadratic FBSDE

abstract:
  In this small note we are concerned with the solution of Forward-Backward
Stochastic Differential Equations (FBSDE) with drivers that grow quadratically
in the control component (quadratic growth FBSDE or qgFBSDE). The main theorem
is a comparison result that allows comparing componentwise the signs of the
control processes of two different qgFBSDE. As a byproduct one obtains
conditions that allow establishing the positivity of the control process.


title: The small-scale dynamo: Breaking universality at high Mach numbers

abstract:
  (Abridged) The small-scale dynamo may play a substantial role in magnetizing
the Universe under a large range of conditions, including subsonic turbulence
at low Mach numbers, highly supersonic turbulence at high Mach numbers and a
large range of magnetic Prandtl numbers Pm, i.e. the ratio of kinetic viscosity
to magnetic resistivity. Low Mach numbers may in particular lead to the
well-known, incompressible Kolmogorov turbulence, while for high Mach numbers,
we are in the highly compressible regime, thus close to Burgers turbulence. In
this study, we explore whether in this large range of conditions, a universal
behavior can be expected. Our starting point are previous investigations in the
kinematic regime. Here, analytic studies based on the Kazantsev model have
shown that the behavior of the dynamo depends significantly on Pm and the type
of turbulence, and numerical simulations indicate a strong dependence of the
growth rate on the Mach number of the flow. Once the magnetic field saturates
on the current amplification scale, backreactions occur and the growth is
shifted to the next-larger scale. We employ a Fokker-Planck model to calculate
the magnetic field amplification during the non-linear regime, and find a
resulting power-law growth that depends on the type of turbulence invoked. For
Kolmogorov turbulence, we confirm previous results suggesting a linear growth
of magnetic energy. For more general turbulent spectra, where the turbulent
velocity v_t scales with the characteristic length scale as u_\ell\propto
\ell^{\vartheta}, we find that the magnetic energy grows as
(t/T_{ed})^{2\vartheta/(1-\vartheta)}, with t the time-coordinate and T_{ed}
the eddy-turnover time on the forcing scale of turbulence. For Burgers
turbulence, \vartheta=1/2, a quadratic rather than linear growth may thus be
expected, and a larger timescale until saturation is reached.


title: A Decidable Theory of Skiplists of Unbounded Size and Arbitrary Height

abstract:
  This paper presents a theory of skiplists of arbitrary height, and shows
decidability of the satisfiability problem for quantifier-free formulas.
  A skiplist is an imperative software data structure that implements sets by
maintaining several levels of ordered singly-linked lists in memory, where each
level is a sublist of its lower levels. Skiplists are widely used in practice
because they offer a performance comparable to balanced binary trees, and can
be implemented more efficiently. To achieve this performance, most
implementations dynamically increment the height (the number of levels).
Skiplists are difficult to reason about because of the dynamic size (number of
nodes) and the sharing between the different layers. Furthermore, reasoning
about dynamic height adds the challenge of dealing with arbitrary many levels.
  The first contribution of this paper is the theory TSL that allows to express
the heap memory layout of a skiplist of arbitrary height. The second
contribution is a decision procedure for the satisfiability prob- lem of
quantifier-free TSL formulas. The last contribution is to illustrate the formal
verification of a practical skiplist implementation using this decision
procedure.


title:
Amplitudes for Spacetime Regions and the Quantum Zeno Effect: Pitfalls
  of Standard Path Integral Constructions

abstract:
  We argue that under very general conditions, there is a significant
complication in amplitudes for spacetimes regions constructed from path
integrals. This is the fact that the concrete implementation of the
restrictions on paths over an interval of time corresponds, in an operator
language, to sharp monitoring at every moment of time in the given time
interval. Such processes suffer from the quantum Zeno effect -- the continual
monitoring of a quantum system in a Hilbert subspace prevents its state from
leaving that subspace. As a consequence, path integral amplitudes defined in
this seemingly obvious way have physically and intuitively unreasonable
properties and in particular, no sensible classical limit. In this paper we
describe this frequently-occurring but little-appreciated phenomenon in some
detail, showing clearly the connection with the quantum Zeno effect. We then
show that it may be avoided by implementing the restriction on paths in the
path integral in a "softer" way. The resulting amplitudes then involve a new
coarse graining parameter, which may be taken to be a timescale $\eps$,
describing the softening of the restrictions on the paths. We argue that the
complications arising from the Zeno effect are then negligible as long as $\eps
>> 1/ E$, where $E$ is the energy scale of the incoming state. Our criticisms
of path integral constructions largely apply to approaches to quantum theory
such as the decoherent histories approach or quantum measure theory, which do
not specifically involve measurements. We address some criticisms of our
approach by Sokolovksi, concerning the relevance of our results to
measurement-based models.


title:
Distribution of the least-squares estimators of a single Brownian
  trajectory diffusion coefficient

abstract:
  In this paper we study the distribution function $P(u_{\alpha})$ of the
estimators $u_{\alpha} \sim T^{-1} \int^T_0 \, \omega(t) \, {\bf B}^2_{t} \,
dt$, which optimise the least-squares fitting of the diffusion coefficient
$D_f$ of a single $d$-dimensional Brownian trajectory ${\bf B}_{t}$. We pursue
here the optimisation further by considering a family of weight functions of
the form $\omega(t) = (t_0 + t)^{-\alpha}$, where $t_0$ is a time lag and
$\alpha$ is an arbitrary real number, and seeking such values of $\alpha$ for
which the estimators most efficiently filter out the fluctuations. We calculate
$P(u_{\alpha})$ exactly for arbitrary $\alpha$ and arbitrary spatial dimension
$d$, and show that only for $\alpha = 2$ the distribution $P(u_{\alpha})$
converges, as $\epsilon = t_0/T \to 0$, to the Dirac delta-function centered at
the ensemble average value of the estimator. This allows us to conclude that
only the estimators with $\alpha = 2$ possess an ergodic property, so that the
ensemble averaged diffusion coefficient can be obtained with any necessary
precision from a single trajectory data, but at the expense of a progressively
higher experimental resolution. For any $\alpha \neq 2$ the distribution
attains, as $\epsilon \to 0$, a certain limiting form with a finite variance,
which signifies that such estimators are not ergodic.


title: Cyclicity in Dirichlet-type spaces and extremal polynomials

abstract:
  For functions $f$ in Dirichlet-type spaces we study how to determine
constructively optimal polynomials $p_n$ that minimize $\|p f-1\|_\alpha$ among
all polynomials $p$ of degree at most $n$. Then we give upper and lower bounds
for the rate of decay of $\|p_{n}f-1\|_{\alpha}$ as $n$ approaches $\infty$.
Further, we study a generalization of a weak version of the Brown-Shields
conjecture and some computational phenomena about the zeros of optimal
polynomials.


title:
Exploring the origin of magnetic fields in massive stars: II. New
  magnetic field measurements in cluster and field stars

abstract:
  Theories on the origin of magnetic fields in massive stars remain poorly
developed, because the properties of their magnetic field as function of
stellar parameters could not yet be investigated.
  To investigate whether magnetic fields in massive stars are ubiquitous or
appear only in stars with a specific spectral classification, certain ages, or
in a special environment, we acquired 67 new spectropolarimetric observations
for 30 massive stars. Among the observed sample, roughly one third of the stars
are probable members of clusters at different ages, whereas the remaining stars
are field stars not known to belong to any cluster or association.
  Spectropolarimetric observations were obtained during four different nights
using the low-resolution spectropolarimetric mode of FORS2 (FOcal Reducer low
dispersion Spectrograph) mounted on the 8-m Antu telescope of the VLT.
Furthermore, we present a number of follow-up observations carried out with the
high-resolution spectropolarimeters SOFIN mounted at the Nordic Optical
Telescope (NOT) and HARPS mounted at the ESO 3.6m between 2008 and 2011. To
assess the membership in open clusters and associations, we used astrometric
catalogues with the highest quality kinematic and photometric data currently
available.
  The presence of a magnetic field is confirmed in nine stars previously
observed with FORS1/2: HD36879, HD47839, CPD-282561, CPD-472963, HD93843,
HD148937, HD149757, HD328856, and HD164794. New magnetic field detections at a
significance level of at least 3sigma were achieved in five stars: HD92206c,
HD93521, HD93632, CPD-468221, and HD157857. Among the stars with a detected
magnetic field, five stars belong to open clusters with high membership
probability. According to previous kinematic studies, five magnetic O-type
stars in our sample are candidate runaway stars.


title:
Multiple models of Bayesian networks applied to offline recognition of
  Arabic handwritten city names

abstract:
  In this paper we address the problem of offline Arabic handwriting word
recognition. Off-line recognition of handwritten words is a difficult task due
to the high variability and uncertainty of human writing. The majority of the
recent systems are constrained by the size of the lexicon to deal with and the
number of writers. In this paper, we propose an approach for multi-writers
Arabic handwritten words recognition using multiple Bayesian networks. First,
we cut the image in several blocks. For each block, we compute a vector of
descriptors. Then, we use K-means to cluster the low-level features including
Zernik and Hu moments. Finally, we apply four variants of Bayesian networks
classifiers (Na\"ive Bayes, Tree Augmented Na\"ive Bayes (TAN), Forest
Augmented Na\"ive Bayes (FAN) and DBN (dynamic bayesian network) to classify
the whole image of tunisian city name. The results demonstrate FAN and DBN
outperform good recognition rates


title: On type I blow up formation for the critical NLW

abstract:
  We introduce a suitable concept of weak evolution in the context of the
radial quintic focussing semilinear wave equation on $\mathbb{R}^{3+1}$, that
is adapted to continuation past type II singularities. We show that the weak
extension leads to type I singularity formation for initial data corresponding
to: (i) the Kenig-Merle blow-up solutions with initial energy below the ground
state and (ii) the Krieger-Nakanishi-Schlag blow-up solutions sitting initially
near and "above" the ground state static solution.


title:
Self-organization of adatom adsorption structure at interaction with tip
  of dynamic force microscope

abstract:
  The formation of an adatom adsorption structure in dynamic force microscopy
experiment is shown as a result of the spontaneous appearance of shear strain
caused by external supercritical heating. This transition is described by the
Kelvin-Voigt equation for a viscoelastic medium, the relaxation
Landau-Khalatnikov equation for shear stress, and the relaxation equation for
temperature. It is shown that these equations formally coincide with the
synergetic Lorenz system, where the shear strain acts as the order parameter,
the conjugate field is reduced to the stress, and the temperature is the
control parameter. Within the adiabatic approximation, the steady-state values
of these quantities are found. Taking into account the sample shear modulus vs
strain dependence, the formation of the adatom adsorption configuration is
described as the first-order transition. The critical temperature of the tip
linearly increases with the growth of the effective value of the sample shear
modulus and decreases with the growth of its typical value.


title: Detecting warm DM in the $MeV/c^2$ range

abstract:
  Some tension exists between present experimental data and models which
comprise only the three light neutrino mass eigenstates necessary to explain
solar and atmospheric oscillation results. Hence the revival of the idea that
additional more massive states might enter the active neutrino superpositions
produced and observed in charged current reactions. Such 'heavy' neutrinos with
masses in the keV or MeV range might also be of interest as dark matter
candidates. A state with mass larger than 1022 keV could decay into an $e^+
e^-$ pair and a light mass state, leaving an easily recognizable signature. The
aim of this paper is to estimate the possible signal rate.


title: Spin-orbit induced hole spin relaxation in InAs and GaAs quantum dots

abstract:
  We study the effect of valence band spin-orbit interactions on the acoustic
phonon assisted spin relaxation of holes confined in quantum dots. Heavy
hole-light hole (hh-lh) mixing and all the spin-orbit terms arising from
zinc-blende bulk inversion asymmetry (BIA) are considered on equal footing in a
fully 3D Hamiltonian. We show that hh-lh mixing and BIA have comparable
contributions to the hole spin relaxation in self-assembled QDs, but BIA
becomes dominant in gated QDs. The dependence of the hole spin relaxation on
the QD geometry and spin splitting energy is drastically different from that of
electrons, with a non-monotonic behavior which results from the interplay
between SOI terms. Our results reconcile contradictory predictions of previous
theoretical works and are consistent with experiments.


title: A note on homologically smooth connected cochain DG algebras

abstract:
  In this paper, we obtain two interesting results on homologically smooth
connected cochain DG algebras. More precisely, we show that any Koszul DG
module in $\mathrm{D_{fg}}(A)$ is compact, when $A$ is a homologically smooth
connected cochain DG algebra with a Noetherian cohomology graded algebra
$H(A)$. And we prove that the homologically smoothness of $A$ is equivalent to
$$\mathrm{D_{fg}}(A)=\mathrm{D}^c(A),$$ if $A$ is a Koszul connected cochain DG
algebra such that $H(A)$ is a Noetherian graded algebra with a balanced
dualizing complex.


title: Nonlinear dynamical systems and linearly forced isotropic turbulence

abstract:
  In this paper, we present an extensive study of linearly forced isotropic
turbulence. By using an analytical method, we identified two parametric choices
that are new to our knowledge. We proved that the underlying nonlinear
dynamical system for linearly forced isotropic turbulence is the general case
of a cubic Lienard equation with linear damping (Dumortier and Rousseau 1990).

categories: physics.flu-dyn cond-mat.stat-mech math-ph math.MP nlin.CD


title: The TANAMI Program: Southern-Hemisphere AGN on (Sub-)parsec Scales

abstract:
  The Southern Hemisphere VLBI monitoring program TANAMI provides
dual-frequency (8 GHz and 22 GHz), milliarcsecond monitoring of extragalactic
jets south of -30 degrees declination. The TANAMI sample consists of a combined
radio and gamma-ray selected subsample of currently 80 AGN jets, with new
gamma-ray bright sources being added upon detections by Fermi/LAT. Supporting
programs provide simultaneous multiwavelength coverage of all sources, in order
to construct broadband spectral energy distributions (SEDs) of flaring and
quiescence source states, as well as a rapid follow-up of high-energy flares.
This combined setup allows us to continuously study the spectral and structural
evolution of highly energetic extragalactic jets and test correlations in
different wavebands, providing crucial information on underlying physical
mechanisms. Here, we present jet kinematics of Centaurus A and show preliminary
VLBI results on PKS 0625-354 and the time-dependent spectral index image of PKS
0537-441.


title: Some inequalities for complete elliptic integrals

abstract:
  In the paper, by using Lupa\c{s} integral inequality, the authors find some
new inequalities for the complete elliptic integrals of the first and second
kinds. These results improve some known inequalities.


title: Diagrammatic theory for twofold degenerate Anderson impurity model

abstract:
  The twofold degenerate Anderson impurity model [1-4] is investigated and the
strong electronic correlations of d-electrons of impurity ion are taken into
account by elaborating suitable diagram technique. We discuss the properties of
the Slater-Kanamori model [2-4] of d-impurity electrons. After finding the
eigenfunctions and eigenvalues of all 16 local states, we determine the local
one-particle propagator. Then we construct the perturbation theory around the
atomic limit of the impurity ion and obtain the Dyson type equation for the
renormalized one-particle propagator. Diagrammatic theory has been developed
and correlation function determined. Special diagrammatic approximation was
discussed and summation of diagram has been considered.


title: A molecular outflow driven by the brown dwarf binary FU Tau

abstract:
  We report the detection of a molecular outflow driven by the brown dwarf
binary FU Tau. Using the IRAM 30 m telescope we observed the $^{12}$CO(2-1)
(CO) emission in the vicinity of FU Tau and detected a bipolar outflow by
examining the wings of the CO(2-1) line as we moved away from the source
position. An integrated map of the wing emission between 3 kms$^{-1}$ and 5
kms$^{-1}$ reveals a blue-shifted lobe at a position of $\sim$ 20 \arcsec\ from
the FU Tau system and at a position angle of $\sim$ 20$^{\circ}$. The beam size
of the observations is $11\arcsec$\ hence it is not possible to distinguish
between the two components of the FU Tau binary. However as optical forbidden
emission, a strong tracer of the shocks caused by outflow activity, has been
detected in the spectrum of FU Tau A we assume this component to be the driving
source of the molecular outflow. We estimate the mass and mass outflow rate of
the outflow at 4 $\times$ 10$^{-6}$ \Msun\ and 6 $\times$ 10$^{-10}$ \Msun/yr
respectively. These results agree well with previous estimates for BD molecular
outflows. FU Tau A is now the third BD found to be associated with molecular
outflow activity and this discovery adds to the already extensive list of the
interesting properties of FU Tau.


title: The gradient flow coupling in the Schr\"odinger Functional

abstract:
  We study the perturbative behavior of the Yang-Mills gradient flow in the
Schr\"odinger Functional, both in the continuum and on the lattice. The energy
density of the flow field is used to define a running coupling at a scale given
by the size of the finite volume box. From our perturbative computation we
estimate the size of cutoff effects of this coupling to leading order in
perturbation theory. On a set of Nf=2 gauge field ensembles in a physical
volume of L ~ 0.4 fm we finally demonstrate the suitability of the coupling for
a precise continuum limit due to modest cutoff effects and high statistical
precision.


title: Semileptonic B decays

abstract:
  We review recent progress in exclusive B --> D^(*) and inclusive B --> X(u)
semileptonic B decays


title: Time-correspondence differential ghost imaging

abstract:
  Experimental data with digital masks and a theoretical analysis are presented
for an imaging scheme that we call time-correspondence differential ghost
imaging (TCDGI). It is shown that by conditional averaging of the information
from the reference detector but with the negative signals inverted, the quality
of the reconstructed images is in general superior to all other ghost imaging
(GI) methods to date. The advantages of both differential GI and
time-correspondence GI are combined, plus less data manipulation and shorter
computation time are required to obtain equivalent quality images under the
same conditions. This TCDGI method offers a general approach applicable to all
GI techniques, especially when objects with continuous gray tones are involved.


title:
A posteriori error control & adaptivity for Crank-Nicolson finite
  element approximations for the linear Schr\"odinger equation

abstract:
  We derive optimal order a posteriori error estimates for fully discrete
approximations of linear Schr\"odinger-type equations, in the
$L^\infty(L^2)-$norm. For the discretization in time we use the Crank-Nicolson
method, while for the space discretization we use finite element spaces that
are allowed to change in time. The derivation of the estimators is based on a
novel elliptic reconstruction that leads to estimates which reflect the
physical properties of Schr\"odinger equations. The final estimates are
obtained using energy techniques and residual-type estimators. Various
numerical experiments for the one-dimensional linear Schr\"odinger equation in
the semiclassical regime, verify and complement our theoretical results. The
numerical implementations are performed with both uniform partitions and
adaptivity in time and space. For adaptivity, we further develop and analyze an
existing time-space adaptive algorithm to the cases of Schr\"odinger equations.
The adaptive algorithm reduces the computational cost substantially and
provides efficient error control for the solution and the observables of the
problem, especially for small values of the Planck constant.


title: Photocurrent Response of Topological Insulator Surface States

abstract:
  We study the photocurrent response of topological insulator surface states to
circularly polarized light for arbitrary oblique incidence. We describe the
surface states within a Dirac model, including several perturbations such as
hexagonal warping, nonlinear corrections to the mode velocity, and applied
magnetic fields. We find that the photogalvanic current is strongly suppressed
for the usual orbital coupling, prompting us to include the weaker Zeeman
coupling. We find that the helicity-independent photocurrent dominates over the
helicity-dependent contributions.


title: Stable maps and stable quotients

abstract:
  We analyze the relationship between two compactifications of the moduli space
of maps from curves to a Grassmannian: the Kontsevich moduli space of stable
maps and the Marian--Oprea--Pandharipande moduli space of stable quotients. We
construct a moduli space which dominates both the moduli space of stable maps
to a Grassmannian and the moduli space of stable quotients, and equip our
moduli space with a virtual fundamental class. We relate the virtual
fundamental classes of all three moduli spaces using the virtual push-forward
formula. This gives a new proof of a theorem of Marian-Oprea-Pandharipande:
that enumerative invariants defined as intersection numbers in the stable
quotient moduli space coincide with Gromov--Witten invariants.


title: A Compliant, Underactuated Hand for Robust Manipulation

abstract:
  This paper introduces the i-HY Hand, an underactuated hand driven by 5
actuators that is capable of performing a wide range of grasping and in-hand
manipulation tasks. This hand was designed to address the need for a durable,
inexpensive, moderately dexterous hand suitable for use on mobile robots. The
primary focus of this paper will be on the novel minimalistic design of i-HY,
which was developed by choosing a set of target tasks around which the design
of the hand was optimized. Particular emphasis is placed on the development of
underactuated fingers that are capable of both firm power grasps and low-
stiffness fingertip grasps using only the passive mechanics of the finger
mechanism. Experimental results demonstrate successful grasping of a wide range
of target objects, the stability of fingertip grasping, as well as the ability
to adjust the force exerted on grasped objects using the passive finger
mechanics.


title:
Granular superconductivity at room temperature in bulk highly oriented
  pyrolytic graphite samples

abstract:
  We have studied the magnetic response of two bulk highly oriented pyrolytic
graphite (HOPG) samples with different internal microstructure. For the sample
with well defined interfaces, parallel to the graphene layers, the temperature
and magnetic field hysteresis are similar to those found recently in
water-treated graphite powders. The observed behavior indicates the existence
of granular superconductivity above room temperature in agreement with previous
reports in other graphite samples. The granular superconductivity behavior is
observed only for fields normal to the embedded interfaces, whereas no relevant
hysteresis in temperature or field is observed for fields applied parallel to
them. Increasing the temperature above $\sim 400$ K changes irreversibly the
hysteretic response of the sample.


title:
Some spectral properties of Rooms and Passages domains and their
  skeletons

abstract:
  In this paper we investigate spectral properties of Lapla- cians on Rooms and
Passages domains. In the first part, we use Dirichlet- Neumann bracketing
techniques to show that for the Neumann Lapla- cian in certain Rooms and
Passages domains the second term of the asymptotic expansion of the counting
function is of order $\sqrt{\lambda}$. For the Dirichlet Laplacian our methods
only give an upper estimate of the form $\sqrt{\lambda}$. In the second part of
the paper, we consider the relation- ship between Neumann Laplacians on Rooms
and Passages domains and Sturm-Liouville operators on the skeleton.


title: Multilevel Polar-Coded Modulation

abstract:
  A framework is proposed that allows for a joint description and optimization
of both binary polar coding and the multilevel coding (MLC) approach for
$2^m$-ary digital pulse-amplitude modulation (PAM). The conceptual equivalence
of polar coding and multilevel coding is pointed out in detail. Based on a
novel characterization of the channel polarization phenomenon, rules for the
optimal choice of the bit labeling in this coded modulation scheme employing
polar codes are developed. Simulation results for the AWGN channel are
included.


title: Separability Idempotents and Multiplier Algebras

abstract:
  Consider two non-degenerate algebras B and C over the complex numbers. We
study a certain class of idempotent elements E in the multiplier algebra of the
tensor product of B with C, called separability idempotents. The conditions
include the existence of non-degenerate anti-homomorphisms from B to M(C) and
from C to M(B), the multiplier algebras of C and B respectively. They are
called the antipodal maps. There also exist what we call distinguished linear
functionals. They are unique and faithful in the regular case. The notion is
more restrictive than what is generally considered in the case of
(finite-dimensional) algebras with identity. The separability idempotents we
consider in this paper are of a Frobenius type. It seems to be quite natural to
consider this type of separability idempotents in the case of non-degenerate
algebras possibly without an identity. One example is coming from a discrete
quantum group A. Here we take B=C=A and E is the image under the coproduct of
h, where h is the normalized cointegral. The antipodal maps coincide with the
original antipode and the distinguished linear functionals are the integrals.
Another example is obtained from a weak multiplier Hopf algebra A. Now B and C
are the images of the source and target maps. For E we take the canonical
idempotent. Again the antipodal maps come from the antipode of the weak
multiplier Hopf algebra. These two examples have motivated the study of
separability idempotents as used in this paper. We use the separability
idempotent to study modules over the base algebras B and C. In the regular
case, we obtain a structure theorem for these algebras.


title:
Fusion procedure for wreath products of finite groups by the symmetric
  group

abstract:
  Let G be a finite group. A complete system of pairwise orthogonal idempotents
is constructed for the wreath product of G by the symmetric group by means of a
fusion procedure, that is by consecutive evaluations of a rational function
with values in the group ring. This complete system of idempotents is indexed
by standard Young multi-tableaux. Associated to the wreath product of G by the
symmetric group, a Baxterized form for the Artin generators of the symmetric
group is defined and appears in the rational function used in the fusion
procedure.


title:
Phase-locked magnetoconductance oscillations as a probe of Majorana edge
  states

abstract:
  We calculate the Andreev conductance of a superconducting ring interrupted by
a flux-biased Josephson junction, searching for electrical signatures of
circulating edge states. Two-dimensional pair potentials of spin-singlet d-wave
and spin-triplet p-wave symmetry support, respectively, (chiral) Dirac modes
and (chiral or helical) Majorana modes. These produce h/e-periodic
magnetoconductance oscillations of amplitude \simeq (e^{2}/h)N^{-1/2}, measured
via an N-mode point contact at the inner or outer perimeter of the grounded
ring. For Dirac modes the oscillations in the two contacts are independent,
while for an unpaired Majorana mode they are phase locked by a topological
phase transition at the Josephson junction.


title:
Searching for thermal signatures of persistent currents in normal metal
  rings

abstract:
  We introduce a calorimetric approach to probe persistent currents in normal
metal rings. The heat capacity of a large ensemble of silver rings is measured
by nanocalorimetry under a varying magnetic field at different temperatures (60
mK, 100 mK and 150 mK). Periodic oscillations versus magnetic field are
detected in the phase signal of the temperature oscillations, though not in the
amplitude (both of them directly linked to the heat capacity). The period of
these oscillations ($\Phi_0/2$, with $\Phi_0 = h/e$ the magnetic flux quantum)
and their evolution with temperature are in agreement with theoretical
predictions. In contrast, the amplitude of the corresponding heat capacity
oscillations (several $k_{\mathrm{B}}$) is two orders of magnitude larger than
predicted by theory.


title: The convex class of realisable unit covariances

abstract:
  This paper concerns the characterisation of second order marginals for random
sets in a discrete setting. Under the instance of unit covariances, this
problem possesses a combinatorial symmetry, exploited jointly in the companion
paper to give a heuristic procedure to check realisability. In particular we
disprove Matheron's conjecture, and explicit partially the structure of the
convex body formed by realisable unit covariances in a finite set.


title: Degenerate random perturbations of Anosov diffeomorphisms

abstract:
  This paper deals with random perturbations of diffeomorphisms on
n-dimensional Riemannian manifolds with distributions supported on
k-dimensional disks, where k<n. First we demonstrate general but not very
intuitive conditions which guarantee that all invariant measures for rank k
random perturbations of $C^2$ diffeomorphisms are absolutely continuous with
respect to the Riemannian measure on M. For two subclasses of Anosov
diffeomorphisms: hyperbolic toral automorphisms and Anosov diffeomorphisms with
codimension 1 stable manifolds, the above conditions are modified in order to
relate k-dimensional disks that support the distributions to certain foliations
that arise from Anosov diffeomorphisms. We conclude that generic rank k random
perturbations have absolutely continuous invariant measures.


title:
Absorption in quantum electrodynamics cavities in terms of a quantum
  jump operator

abstract:
  We describe the absorption by the walls of a quantum electrodynamics cavity
as a process during which the elementary excitations (photons) of an internal
mode of the cavity exit by tunneling through the cavity walls. We estimate by
classical methods the survival time of a photon inside the cavity and the
quality factor of its mirrors.


title: The Galactic Wind Haze and its $\gamma$-spectrum

abstract:
  We study the possibility that the gamma ray emission in the Fermi bubbles
observed is produced by cosmic ray electrons with a spectrum similar to
Galactic cosmic rays. We argue that the cosmic ray electrons steepen near 1 TeV
from $E^{-3}$ to about $E^{-4.2}$, and are partially secondaries derived from
the knee-feature of normal cosmic rays. We speculate that the observed feature
at $\sim 130$ GeV could essentially be due to inverse Compton emission off a
pair-production peak on top of a turn-off in the $\gamma$ ray spectrum at $\sim
130$ GeV. It suggests that the knee of normal cosmic rays is the same
everywhere in the Galaxy. A consequence could be that all supernovae
contributing give the same cosmic ray spectrum, with the knee feature given by
common stellar properties; in fact, this is consistent with the supernova
theory proposed by Bisnovatyi-Kogan (1970), a magneto-rotational mechanism, if
massive stars converge to common properties in terms of rotation and magnetic
fields just before they explode.


title: On rates in Euler's formula for C_0-semigroups

abstract:
  By functional calculus methods, we obtain optimal convergence rates in
Euler's approximation formula for C_0-semigroups restricted to ranges of
generalized Stieltjes functions. Our results include a number of partial cases
studied in the literature and cannot essentially be improved.


title:
Rare regions of the Susceptible Infected Susceptible model on
  Barab\'asi-Albert networks

abstract:
  I extend a previous work to Susceptible-Infected-Susceptible (SIS) models on
weighted Barab\'asi-Albert scale-free networks. Numerical evidence is provided
that phases with slow, power-law dynamics emerge as the consequence of quenched
disorder and tree topologies studied previously with the Contact Process. I
compare simulation results with spectral analysis of the networks and show that
the quenched mean-field (QMF) approximation provides a reliable, relatively
fast method to explore activity clustering. This suggests that QMF can be used
for describing rare-region effects due to network inhomogeneities. Finite size
study of the QMF shows the expected disappearance of the epidemic threshold
$\lambda_c$ in the thermodynamic limit and an inverse participation ratio $\sim
0.25$, meaning localization in case of disassortative weight scheme. Contrary,
for the multiplicative weights and the unweighted trees this value vanishes in
the thermodynamic limit, suggesting only weak rare region effects in agreement
with the dynamical simulations. Strong corrections to the mean-field behavior
in case of disassortative weights explains the concave shape of the order
parameter $\rho(\lambda)$ at the transition point. Application of this method
to other models may reveal interesting rare-region effects, Griffiths Phases as
the consequence of quenched topological heterogeneities.


title:
Multiple Andreev reflection and critical current in topological
  superconducting nanowire junctions

abstract:
  We study transport in a voltage biased superconductor-normal-superconductor
(SNS) junction made of semiconducting nanowires with strong spin-orbit
coupling, as it transitions into a topological superconducting phase for
increasing Zeeman field. Despite the absence of a fractional steady-state ac
Josephson current in the topological phase, the dissipative multiple Andreev
reflection (MAR) current I_dc at different junction transparencies is
particularly revealing. It exhibits unique features related to topology, such
as the gap inversion, the formation of Majorana bound states, and
fermion-parity conservation. Moreover, the critical current I_c, which
remarkably does not vanish at the critical point where the system becomes
gapless, provides direct evidence of the topological transition.


title: Genus stabilization for moduli of curves with symmetries

abstract:
  In a previous paper, arXiv:1206.5498, we introduced a new homological
invariant $\e$ for the faithful action of a finite group G on an algebraic
curve.
  We show here that the moduli space of curves admitting a faithful action of a
finite group G with a fixed homological invariant $\e$, if the genus g' of the
quotient curve is sufficiently large, is irreducible (and non empty iff the
class satisfies the condition which we define as 'admissibility'). In the
unramified case, a similar result had been proven by Dunfield and Thurston
using the classical invariant in the second homology group of G, H_2(G, \ZZ).
  We achieve our result showing that the stable classes are in bijection with
the set of admissible classes $\e$.


title: First observation of $^{13}$Li ground state

abstract:
  The ground state of neutron-rich unbound $^{13}$Li was observed for the first
time in a one-proton removal reaction from $^{14}$Be at a beam energy of 53.6
MeV/u. The $^{13}$Li ground state was reconstructed from $^{11}$Li and two
neutrons giving a resonance energy of 120$^{+60}_{-80}$ keV. All events
involving single and double neutron interactions in the Modular Neutron Array
(MoNA) were analyzed, simulated, and fitted self-consistently. The three-body
($^{11}$Li+$n+n$) correlations within Jacobi coordinates showed strong
dineutron characteristics. The decay energy spectrum of the intermediate
$^{12}$Li system ($^{11}$Li+$n$) was described with an s-wave scattering length
of greater than -4 fm, which is a smaller absolute value than reported in a
previous measurement.


title: Turbulence evolution in MHD plasmas

abstract:
  Turbulence in the interstellar medium has been an active field of research in
the last decade. Numerical simulations are the tool of choice in most cases.
But while there are a number of simulations on the market some questions have
not been answered finally. In this paper we are going to examine the influence
of compressible and incompressible driving on the evolution of turbulent
spectra in a number of possible interstellar medium scenarios. We conclude that
the driving not only has an influence on the ratio of compressible to
incompressible component but also on the anisotropy of turbulence.


title:
Search for Higgs boson production in association with b quarks at CMS in
  pp collisions

abstract:
  A search for neutral Higgs bosons produced in association with b-quark(s) and
decaying into a pair of b-quarks is performed with the CMS detector at LHC. The
Higgs boson signal is expected to emerge as an excess in the mass spectrum of
two b-tagged jets. Dedicated triggers with on-line b-tagging in fully hadronic
events were developed specifically for this kind of analysis. Limits on the
cross section times branching fractions are derived model independently. The
result was interpreted in the Minimal Supersymmetric Model (MSSM). Upper limits
at $tan\beta$ are derived as a function of MA, the mass of the Higgs boson A.
In the analysis presented here data taken in 2011 at 7 TeV are used
corresponding to a total luminosity of $ L = 2.7 - 4.0 fb^{-1} $ for low and
medium Higgs boson masses, respectively.


title: A pathological random perturbation of the Cat Map

abstract:
  In this paper we give an example of a random perturbation of the Cat Map that
produces a "global statistical attractor" in the form of a line segment. The
transition probabilities for this random perturbation are smooth in some but
not all directions. All initial distributions on $\mathbb{T}^2$ are attracted
to distributions supported on this line segment.


title:
Incorporating learning goals about modeling into an upper-division
  physics laboratory experiment

abstract:
  Implementing a laboratory activity involves a complex interplay among
learning goals, available resources, feedback about the existing course, best
practices for teaching, and an overall philosophy about teaching labs. Building
on our previous work, which described a process of transforming an entire lab
course, we now turn our attention to how an individual lab activity on the
polarization of light was redesigned to include a renewed emphasis on one broad
learning goal: modeling. By using this common optics lab as a concrete case
study of a broadly applicable approach, we highlight many aspects of the
activity development and show how modeling was used to integrate sophisticated
conceptual and quantitative reasoning into the experimental process through the
various aspects of modeling: constructing models, making predictions,
interpreting data, comparing measurements with predictions, and refining
models. One significant outcome is a natural way to integrate an analysis and
discussion of systematic error into a lab activity.


title:
Oblique derivative problem for non-divergence parabolic equations with
  discontinuous in time coefficients

abstract:
  We consider an oblique derivative problem for non-divergence parabolic
equations with discontinuous in $t$ coefficients in a half-space. We obtain
weighted coercive estimates of solutions in anisotropic Sobolev spaces. We also
give an application of this result to linear parabolic equations in a bounded
domain. In particular, if the boundary is of class ${\cal C}^{1,\delta}$,
$\delta\in (0,1]$, then we present a coercive estimate of solutions in weighted
anisotropic Sobolev spaces, where the weight is a power of the distance to the
boundary.


title:
The Luminosities of Protostars in the Spitzer c2d and Gould Belt Legacy
  Clouds

abstract:
  Motivated by the long-standing "luminosity problem" in low-mass star
formation whereby protostars are underluminous compared to theoretical
expectations, we identify 230 protostars in 18 molecular clouds observed by two
Spitzer Space Telescope Legacy surveys of nearby star-forming regions. We
compile complete spectral energy distributions, calculate Lbol for each source,
and study the protostellar luminosity distribution. This distribution extends
over three orders of magnitude, from 0.01 Lsun - 69 Lsun, and has a mean and
median of 4.3 Lsun and 1.3 Lsun, respectively. The distributions are very
similar for Class 0 and Class I sources except for an excess of low luminosity
(Lbol < 0.5 Lsun) Class I sources compared to Class 0. 100 out of the 230
protostars (43%) lack any available data in the far-infrared and submillimeter
(70 um < wavelength < 850 um) and have Lbol underestimated by factors of 2.5 on
average, and up to factors of 8-10 in extreme cases. Correcting these
underestimates for each source individually once additional data becomes
available will likely increase both the mean and median of the sample by 35% -
40%. We discuss and compare our results to several recent theoretical studies
of protostellar luminosities and show that our new results do not invalidate
the conclusions of any of these studies. As these studies demonstrate that
there is more than one plausible accretion scenario that can match
observations, future attention is clearly needed. The better statistics
provided by our increased dataset should aid such future work.


title:
The role of taste affinity in agent-based models for social
  recommendation

abstract:
  In the Internet era, online social media emerged as the main tool for sharing
opinions and information among individuals. In this work we study an adaptive
model of a social network where directed links connect users with similar
tastes, and over which information propagates through social recommendation.
Agent-based simulations of two different artificial settings for modeling user
tastes are compared with patterns seen in real data, suggesting that users
differing in their scope of interests is a more realistic assumption than users
differing only in their particular interests. We further introduce an extensive
set of similarity metrics based on users' past assessments, and evaluate their
use in the given social recommendation model with both artificial simulations
and real data. Superior recommendation performance is observed for similarity
metrics that give preference to users with small scope---who thus act as
selective filters in social recommendation.


title: The Morse and Maslov indices for matrix Hill's equations

abstract:
  For Hill's equations with matrix valued periodic potential, we discuss
relations between the Morse index, counting the number of unstable eigenvalues,
and the Maslov index, counting the number of signed intersections of a path in
the space of Lagrangian planes with a fixed plane. We adapt to the one
dimensional periodic setting the strategy of a recent paper by J. Deng and C.
Jones relating the Morse and Maslov indices for multidimensional elliptic
eigenvalue problems.


title: First and second sound in a highly elongated Fermi gas at unitarity

abstract:
  We consider a Fermi gas at unitarity trapped by a highly elongated harmonic
potential and solve the equations of two fluid hydrodynamics at finite
temperature. The propagation of sound waves as well as the discretized
solutions in the presence of weak axial trapping are considered. The relevant
thermodynamic functions entering the hydrodynamic equations are discussed in
the superfluid and normal regimes in terms of universal scaling functions. Both
first sound and second sound solutions are calculated as a function of
temperature and the role of the superfluid density is explicitly pointed out.
The density fluctuations in the second sound wave are found to be large enough
to be measured as a consequence of the finite thermal expansion coefficient of
the gas. Emphasis is given to the comparison with recent experimental data.


title:
Long-time behavior for the two-dimensional motion of a disk in a viscous
  fluid

abstract:
  In this article, we study the long-time behavior of solutions of the
two-dimensional fluid-rigid disk problem. The motion of the fluid is modeled by
the two-dimensional Navier-Stokes equations, and the disk moves under the
influence of the forces exerted by the viscous fluid. We first derive
$L^p$-$L^q$ decay estimates for the linearized equations and compute the first
term in the asymptotic expansion of the solutions of the linearized equations.
We then apply these computations to derive time-decay estimates for the
solutions to the full Navier-Stokes fluid-rigid disk system.


title: Flag Bicolorings, Pseudo-Orientations, and Double Covers of Maps

abstract:
  This paper discusses consistent flag bicolorings of maps and maniplexes, in
their own right and as generalizations of orientations and pseudo-orientations.
Furthermore, a related doubling concept is introduced, and relationships
between these ideas are explored.


title: On the number of relevant operators in asymptotically safe gravity

abstract:
  The asymptotic safety scenario of gravity conjectures that (i) the quantum
field theory of gravity exists thanks to the presence of a non-trivial
ultraviolet fixed point of the renormalization group, and that (ii) the fixed
point has only a finite number of relevant perturbations, i.e. a finite number
of UV-stable directions (or in other words, a finite number of free parameters
to be fixed experimentally). Within the f(R) approximation of the functional
renormalization group equation of gravity, we show that assuming the first half
of the conjecture to be true, the remaining half follows from general
arguments, that is, we show that assuming the existence of a non-trivial fixed
point, the fact that the number of relevant directions is finite is a general
consequence of the structure of the equations.


title:
Antarctic Radio Frequency Albedo and Implications for Cosmic Ray
  Reconstruction

abstract:
  From an elevation of ~38 km, the balloon-borne ANtarctic Impulsive Transient
Antenna (ANITA) is designed to detect the up-coming radio frequency (RF) signal
resulting from a sub-surface neutrino-nucleon collision. Although no neutrinos
have been discovered thus far, ANITA is nevertheless the only experiment to
self-trigger on radio frequency emissions from cosmic-ray induced atmospheric
air showers. In the majority of those cases, down-coming RF signals are
observed via their reflection from the Antarctic ice sheet and back up to the
ANITA interferometer. Estimating the energy scale of the incident cosmic rays
therefore requires an estimate of the fractional power reflected at the air-ice
interface. Similarly, inferring the energy of neutrinos interacting in-ice from
observations of the upwards-directed signal refracting out to ANITA also
requires consideration of signal coherence across the interface. By comparing
the direct Solar RF signal intensity measured with ANITA to the
surface-reflected Solar signal intensity, as a function of incident elevation
angle relative to the surface {\Theta}, we estimate the power reflection
coefficients R({\Theta}). We find general consistency between our average
measurements and the values of R({\Theta}) expected from the Fresnel equations,
separately for horizontal- vs. vertical-polarizations.


title:
Strong Coupling Expansion in a Correlated Three-Dimensional Topological
  Insulator

abstract:
  Motivated by recent studies which show that topological phases may emerge in
strongly correlated electron systems, we theoretically study the strong
electron correlation effect in a three-dimensional topological insulator, which
effective Hamiltonian can be described by the Wilson fermions. We adopt 1/r
long-range Coulomb interaction as the interaction between the bulk electrons.
Based on the U(1) lattice gauge theory, the strong coupling expansion is
applied by assuming that the effective interaction is strong. It is shown that
the effect of the Coulomb interaction is equivalent to the renormalization of
the bare mass of the Wilson fermions, and that as a result, the topological
insulator phase survives in the strong coupling limit.


title:
Conditional expectations, traces, angles between spaces and
  Representations of the Hecke algebras

abstract:
  In this paper we extend the results in [Ra] on the representation of the
Hecke algebra, determined by the matrix coefficients of a projective, unitary
representation, in the discrete series of representations of the ambient group,
to a more general, vector valued case. This method is used to analyze the
traces of the Hecke operators.
  We construct representations of the Hecke algebra of a group $G$, relative to
an almost normal subgroup $\Gamma$, into the von Neumann algebra of the group
$G$, tensor matrices. The representations we obtain are a lifting of the Hecke
operators to this larger algebra. By summing up the coefficients of the terms
in the representation one obtains the classical Hecke operators.
  These representations were used in the scalar case in [Ra], to find an
alternative representation of the Hecke operators on Maass forms, and hence to
reformulate the Ramanujan Petersson conjectures as a problem on the angle (see
e.g. A. Connes's paper [Co] on the generalization of CKM matrix) between two
subalgebras of the von Neumann algebra of the group $G$: the image of the
representation of the Hecke algebra and the algebra of the almost normal
subgroup.


title:
Engineering quantum anomalous Hall phases with orbital and spin degrees
  of freedom

abstract:
  Combining tight-binding models and first principles calculations, we
investigate the quantum anomalous Hall (QAH) effect induced by intrinsic
spin-orbit coupling (SOC) in buckled honeycomb lattice with sp orbitals in an
external exchange field. Detailed analysis reveals that nontrivial topological
properties can arise utilizing not only spin but also orbital degrees of
freedom in the strong SOC limit, when the bands acquire non-zero Chern numbers
upon undergoing the so-called orbital purification. As a prototype of a buckled
honeycomb lattice with strong SOC we choose the Bi(111) bilayer, analyzing its
topological properties in detail. In particular, we show the emergence of
several QAH phases upon spin exchange of the Chern numbers as a function of SOC
strength and magnitude of the exchange field. Interestingly, we observe that in
one of such phases, namely, in the quantum spin Chern insulator phase, the
quantized charge and spin Hall conductivities co-exist. We consider the
possibility of tuning the SOC strength in Bi bilayer via alloying with
isoelectronic Sb, and speculate that exotic properties could be expected in
such an alloyed system owing to the competition of the topological properties
of its constituents. Finally, we demonstrate that 3d dopants can be used to
induce a sizeable exchange field in Bi(111) bilayer, resulting in non-trivial
Chern insulator properties.


title:
Non-Steady wall-bounded flows of viscoelastic fluids under periodic
  forcing

abstract:
  The problem of oscillating flows inside pipes under periodic forcing of
viscoelastic fluids is addressed here. Starting from the linear Oldroyd-B
model, a generalized Darcy's law is obtained in frequency domain and an
explicit expression for the dependence of the dynamic permeability on fluid
parameters and forcing frequency is derived. Previous results in both
viscoelastic and Newtonian fluids are here shown to be particular cases of our
results. On the basis of our calculations, a possible explanation for the
observed damping of local dynamic response as the forcing frequency increases
is given. Good fitting with recent experimental studies of wave propagation in
viscoelastic media is here exhibited. Sound wave propagation in viscoelastic
media flowing inside straight pipes is investigated. In particular, we obtain
the local dynamic response for weakly compressible flows.


title:
Stability of the optimal filter in a hidden Markov model with
  multiplicative noise

abstract:
  We consider a hidden Markov model with multiplicative noise emerging from
studies of software reliability. We show the stability of the optimal filter
with respect to general initial conditions in the total variation- and
$L^p$-norm and deduce explicit rates. Remarkably, stability turns out to be
independent of the ergodic behavior of the signal.


title: Lifting Galois sections along torsors

abstract:
  The cuspidalization conjecture, which is a consequence of Grothendieck's
section conjecture, asserts that for any smooth hyperbolic curve $X$ over a
finitely generated field $k$ of characteristic $0$ and any non empty Zariski
open $U \subset X$, every section of $\pi _1 (X, \bar x) \to \mathrm{Gal}_k$
lifts to a section of $\pi _1 (U,\bar x) \to \mathrm{Gal}_k$. We consider in
this article the problem of lifting Galois sections to the intermediate
quotient $ \pi_1^{cc}(U)$ introduced by Mochizuki. We show that when $k =
\mathbb Q$ and $D=X\setminus U$ is an union of torsion sub-packets every Galois
section actually lifts to $ \pi_1^{cc}(U)$. One of the main tools in the proof
is the construction of torus torsors $F_D$ and $E_D$ over $X$ and the geometric
interpretation $ \pi_1^{cc}(U) \simeq \pi _1 (F_D)$.


title:
User Interface Tools for Navigation in Conditional Probability Tables
  and Elicitation of Probabilities in Bayesian Networks

abstract:
  Elicitation of probabilities is one of the most laborious tasks in building
decision-theoretic models, and one that has so far received only moderate
attention in decision-theoretic systems. We propose a set of user interface
tools for graphical probabilistic models, focusing on two aspects of
probability elicitation: (1) navigation through conditional probability tables
and (2) interactive graphical assessment of discrete probability distributions.
We propose two new graphical views that aid navigation in very large
conditional probability tables: the CPTree (Conditional Probability Tree) and
the SCPT (shrinkable Conditional Probability Table). Based on what is known
about graphical presentation of quantitative data to humans, we offer several
useful enhancements to probability wheel and bar graph, including different
chart styles and options that can be adapted to user preferences and needs. We
present the results of a simple usability study that proves the value of the
proposed tools.


title:
Recent progress on light scalars: from confusion to precision using
  dispersion theory

abstract:
  In this talk I briefly review the recent developments on light scalar meson
spectroscopy, paying particular attention to the causes of major revision of
the $\sigma$ or $f_0(500)$ meson in the Review of Particle Phsycis. This
resonance, despite playing a central role in the nucleon-nucleon attraction as
well as the QCD chiral symmetry breaking, has suffered a longstanding
controversy which has been acknowledged to be finally settled. The combination
of new and precise data together with rigorous dispersive approaches has turned
the old confusing situation about the properties of these mesons, and even thir
existence in some cases, into a field which now aims at precision studies.


title:
Language learning from positive evidence, reconsidered: A
  simplicity-based approach

abstract:
  Children learn their native language by exposure to their linguistic and
communicative environment, but apparently without requiring that their mistakes
are corrected. Such learning from positive evidence has been viewed as raising
logical problems for language acquisition. In particular, without correction,
how is the child to recover from conjecturing an over-general grammar, which
will be consistent with any sentence that the child hears? There have been many
proposals concerning how this logical problem can be dissolved. Here, we review
recent formal results showing that the learner has sufficient data to learn
successfully from positive evidence, if it favours the simplest encoding of the
linguistic input. Results include the ability to learn a linguistic prediction,
grammaticality judgements, language production, and form-meaning mappings. The
simplicity approach can also be scaled-down to analyse the ability to learn a
specific linguistic constructions, and is amenable to empirical test as a
framework for describing human language acquisition.


title:
Transport signatures of Floquet Majorana fermions in driven topological
  superconductors

abstract:
  Floquet Majorana fermions are steady states of equal superposition of
electrons and holes in a periodically driven superconductor. We study the
experimental signatures of Floquet Majorana fermions in transport measurements
and show, both analytically and numerically, that their presence is signaled by
a quantized conductance sum rule over discrete values of lead bias differing by
multiple absorption or emission energies at drive frequency. We also study the
effects of static disorder and find that the quantized sum rule is robust
against weak disorder. Thus, we offer a unique way to identify the topological
signatures of Floquet Majorana fermions.


title: Simulations of the merging galaxy cluster Abell 3376

abstract:
  Observed galaxy clusters often exhibit X-ray morphologies suggestive of
recent interaction with an infalling subcluster. Abell 3376 is a nearby
(z=0.046) massive galaxy cluster whose bullet-shaped X-ray emission indicates
that it may have undergone a recent collision. It displays a pair of Mpc-scale
radio relics and its brightest cluster galaxy is located 970 h_70^-1 kpc away
from the peak of X-ray emission, where the second brightest galaxy lies. We
attempt to recover the dynamical history of Abell 3376. We perform a set of
N-body adiabatic hydrodynamical simulations using the SPH code Gadget-2. These
simulations of binary cluster collisions are aimed at exploring the parameter
space of possible initial configurations. By attempting to match X-ray
morphology, temperature, virial mass and X-ray luminosity, we set approximate
constraints on some merger parameters. Our best models suggest a collision of
clusters with mass ratio in the range 1/6-1/8, and having a subcluster with
central gas density four times higher than that of the major cluster. Models
with small impact parameter (b<150 kpc), if any, are preferred. We estimate
that Abell 3376 is observed approximately 0.5 Gyr after core passage, and that
the collision axis is inclined by i~40 degrees with respect to the plane of the
sky. The infalling subcluster drives a supersonic shock wave that propagates at
almost 2600 km/s, implying a Mach number as high as M~4; but we show how it
would have been underestimated as M~3 due to projection effects.


title: A Saddle Point Numerical Method for Helmholtz Equations

abstract:
  In a previous work, the author and D.C. Dobson proposed a numerical method
for solving the complex Helmholtz equation based on the minimization
variational principles developed by Milton, Seppecher, and Bouchitte. This
method results in a system of equations with a symmetric positive definite
coefficient matrix, but at the same time requires solving simultaneously for
the solution and its gradient. Herein is presented a method based on the saddle
point variational principles of Milton, Seppecher, and Bouchitte, which
produces symmetric positive definite systems of equations, but eliminates the
necessity of solving for the gradient of the solution. The result is a method
for a wide class of Helmholtz problems based completely on the Conjugate
Gradient algorithm.


title:
Stress dependence of the critical currents in neutron irradiated (RE)BCO
  coated conductors

abstract:
  The application of HTS coated conductors in future fusion or accelerator
magnets is currently of increasing interest. High Lorentz forces and therefore
high hoop stresses act on the conductors in large coils. The conductor is
furthermore exposed to neutron radiation in fusion or accelerator magnets. The
expected neutron fluence over the desired lifetime of such magnets can be
simulated by irradiation experiments in a fission reactor. The coated
conductors were characterized in the pristine state and after irradiation to
the ITER design fluence. The sensitivity of the critical currents to applied
stress was measured in liquid nitrogen. The cold part of the set-up was
positioned between a rotatable split coil electro-magnet for assessing the
Ic-anisotropy up to 1.4T under maximum Lorentz force configuration. The
Ic-sensitivity to applied stress changed significantly in the
GdBCO/IBADconductors after irradiation, whereas nearly no change was observed
in the YBCO/RABiTS-conductor. Furthermore, Ic and Tc were strongly reduced in
the GdBCO/IBAD-sample after irradiation. The angular dependence of Ic changed
for both samples in different ways after the irradiation, but no change in the
angular dependence was observed upon applying stress. The high neutron capture
cross-section of Gd and the resulting strong reduction of Tc seem to be
responsible for the different stress dependence of Ic in irradiated Gd-123
coated conductors.


title: The Physical Mirror Equivalence for the Local P^2

abstract:
  In this paper we consider the total space of the canonical bundle of P^2 and
we use a proposal by Hosono, together with results in Seidel and
Auroux-Katzarkov-Orlov, to deduce the right physical mirror equivalence between
D^b(K_{P^2}) and the derived Fukaya category of its mirror. By construction,
our equivalence is compatible with the mirror map between moduli spaces and
with the computation of Gromov--Witten invariants.


title: Simultaneous computation of the row and column rank profiles

abstract:
  Gaussian elimination with full pivoting generates a PLUQ matrix
decomposition. Depending on the strategy used in the search for pivots, the
permutation matrices can reveal some information about the row or the column
rank profiles of the matrix. We propose a new pivoting strategy that makes it
possible to recover at the same time both row and column rank profiles of the
input matrix and of any of its leading sub-matrices. We propose a
rank-sensitive and quad-recursive algorithm that computes the latter PLUQ
triangular decomposition of an m \times n matrix of rank r in O(mnr^{\omega-2})
field operations, with \omega the exponent of matrix multiplication. Compared
to the LEU decomposition by Malashonock, sharing a similar recursive structure,
its time complexity is rank sensitive and has a lower leading constant. Over a
word size finite field, this algorithm also improveLs the practical efficiency
of previously known implementations.


title:
Near-resonant optical forces beyond the two-level approximation for a
  continuous source of spin-polarized cold atoms

abstract:
  We propose a method to generate a source of spin-polarized cold atoms which
are continuously extracted and guided from a magneto-optical trap using an
atom-diode effect. We show that it is possible to create a pipe-like potential
by overlapping two optical beams coupled with the two transitions of a
three-level system in a ladder configuration. With alkali-metal atoms, and in
particular with $^{87}$Rb, a proper choice of transitions enables both the
potential generation and optical pumping, thus polarizing the sample in a given
Zeeman state. We extend the Dalibard and Cohen-Tannoudji dressed-atom model of
radiative forces to the case of a three-level system. We derive expressions for
the average force and the different sources of momentum diffusion in the
resonant, non-perturbative regime. We show using numerical simulations that a
significant fraction of the atoms initially loaded can be guided over several
centimeters with output velocities of a few meters per second. This would
produce a collimated continuous source of slow spin-polarized atoms suitable
for atom interferometry.


title:
Updated search for the standard model Higgs boson in events with jets
  and missing transverse energy using the full CDF data set

abstract:
  We present an updated search for the Higgs boson produced in association with
a vector boson in the final state with missing transverse energy and two jets.
We use the full CDF data set corresponding to an integrated luminosity of 9.45
fb${}^{-1}$ at a proton-antiproton center-of-mass energy of $\sqrt{s}=1.96$
TeV. New to this analysis is the inclusion of a $b$-jet identification
algorithm specifically optimized for $H\to b\bar{b}$ searches. Across the Higgs
boson mass range $90 \le m_H \le 150$ GeV$/c^2$, the expected 95% credibility
level upper limits on the $V H$ production cross section times the $H\to
b\bar{b}$ branching fraction are improved by an average of 14% relative to the
previous analysis. At a Higgs boson mass of 125 GeV$/c^2$, the observed
(expected) limit is 3.06 (3.33) times the standard model prediction,
corresponding to one of the most sensitive searches to date in this final
state.


title: Communication Complexity of Channels in General Probabilistic Theories

abstract:
  The communication complexity of a quantum channel is the minimal amount of
classical communication required for classically simulating the process of
preparation, transmission through the channel, and subsequent measurement of a
quantum state. At present, only little is known about this quantity. In this
paper, we present a procedure for systematically evaluating the communication
complexity of channels in any general probabilistic theory, in particular
quantum theory. The procedure is constructive and provides the most efficient
classical protocols. We illustrate this procedure by evaluating the
communication complexity of a quantum depolarizing channel with some finite
sets of quantum states and measurements.