title:
$W^{\pm}$ bosons production in the quantum statistical parton
  distributions approach

abstract:
  We consider $W^{\pm}$ gauge bosons production in connection with recent
results from BNL-RHIC and FNAL-Tevatron and interesting predictions from the
statistical parton distributions. They concern relevant aspects of the
structure of the nucleon sea and the high-$x$ region of the valence quark
distributions. We also give predictions in view of future proton-neutron
collisions experiments at BNL-RHIC.


title: A Global Homogeneity Test for High-Dimensional Linear Regression

abstract:
  This paper is motivated by the comparison of genetic networks based on
microarray samples. The aim is to test whether the differences observed between
two inferred Gaussian graphical models come from real differences or arise from
estimation uncertainties. Adopting a neighborhood approach, we consider a
two-sample linear regression model with random design and propose a procedure
to test whether these two regressions are the same. Relying on multiple testing
and variable selection strategies, we develop a testing procedure that applies
to high-dimensional settings where the number of covariates $p$ is larger than
the number of observations $n_1$ and $n_2$ of the two samples. Both type I and
type II errors are explicitely controlled from a non-asymptotic perspective and
the test is proved to be minimax adaptive to the sparsity. The performances of
the test are evaluated on simulated data. Moreover, we illustrate how this
procedure can be used to compare genetic networks on Hess \emph{et al} breast
cancer microarray dataset.


title: Bose-Hubbard dimers, Viviani's windows and pendulum dynamics

abstract:
  The two-mode Bose-Hubbard model in the mean-field approximation is revisited
emphasizing a geometric interpretation where the system orbits appear as
intersection curves of a (Bloch) sphere and a cylinder oriented parallel to the
mode axis, which provide a generalization of Viviani's curve studied already in
1692. In addition, the dynamics is shown to agree with the simple mathematical
pendulum. The areas enclosed by the generalised Viviani curves, the action
integrals, which can be used to semiclassically quantize the N-particle
eigenstates, are evaluated. Furthermore the significance of the original
Viviani curve for the quantum system is demonstrated.


title:
Geodesic Completeness for Sobolev $H^{s}$-metrics on the Diffeomorphisms
  Group of the Circle

abstract:
  We prove that the weak Riemannian metric induced by the fractional Sobolev
norm $H^s$ on the diffeomorphisms group of the circle is geodesically complete,
provided $s>3/2$.


title: Influence of ferromagnetic ordering on Raman scattering in CoS$_2$

abstract:
  The effects of phonon anharmonicity, phonon-magnon and electron-phonon
interactions on the temperature dependence of Raman optical phonon modes are
theoretically investigated. Besides of the Klemens result for the phonon width
due to anharmonicity, the corresponding lineshift is derived. We argue that the
phonon decay into two magnons has very low intensity in ferromagnets with low
Curie temperatures. Therefore, the electron interband transitions accompanied
with the ferromagnetic ordering are included in considerations to get a good
quantitative agreement with experiments.


title:
Exploring electrical conductivity within mesoscopic phases of
  semi-conducting PEDOT:PSS films by Broadband Dielectric Spectroscopy

abstract:
  Poly(3,4-ethylenedioxythiophene) : poly(styrene sulfonic acid (PEDOT:PSS), an
optically transparent organic semi-conductor, constitutes a suspension of
conducting PEDOT:PSS grains, shelled by an insulating layer of PSS. While a
percolation network enhances dc conductivity, structural and electrical
inhomogenity hinters electric charge flow giving rise to capacitance effects.
In the present work, two distinct relaxation mechanisms are detected by
Broadband Dielectric Spectroscopy (BDS). Double polarization mechamisms are
predicted by bi-phase suspension dielectric theory. Within the frame of
interfacial polarization, we propose a methodology to have an insight into the
local conductivity of the interior of mesoscopic conducting phase.


title:
Towards time-dependent, non-equilibrium charge-transfer force fields:
  Contact electrification and history-dependent dissociation limits

abstract:
  Force fields uniquely assign interatomic forces for a given set of atomic
coordinates. The underlying assumption is that electrons are in their
quantum-mechanical ground state or in thermal equilibrium. However, there is an
abundance of cases where this is unjustified because the system is only locally
in equilibrium. In particular, the fractional charges of atoms, clusters, or
solids tend to not only depend on atomic positions but also on how the system
reached its state. For example, the charge of an isolated solid -- and thus the
forces between atoms in that solid -- usually depends on the counterbody with
which it has last formed contact. Similarly, the charge of an atom, resulting
from the dissociation of a molecule, can differ for different solvents in which
the dissociation took place. In this paper we demonstrate that such
charge-transfer history effects can be accounted for by assigning discrete
oxidation states to atoms. With our method, an atom can donate an integer
charge to another, nearby atom to change its oxidation state as in a redox
reaction. In addition to integer charges, atoms can exchange "partial charges"
which are determined with the split charge equilibration method.


title: Dualizability in Low-Dimensional Higher Category Theory

abstract:
  These lecture notes form an expanded account of a course given at the Summer
School on Topology and Field Theories held at the Center for Mathematics at the
University of Notre Dame, Indiana during the Summer of 2012. A similar lecture
series was given in Hamburg in January 2013. The lecture notes are divided into
two parts.
  The first part, consisting of the bulk of these notes, provides an expository
account of the author's joint work with Christopher Douglas and Noah Snyder on
dualizability in low-dimensional higher categories and the connection to
low-dimensional topology. The cobordism hypothesis provides bridge between
topology and algebra, establishing important connections between these two
fields. One example of this is the prediction that the $n$-groupoid of
so-called `fully-dualizable' objects in any symmetric monoidal $n$-category
inherits an O(n)-action. However the proof of the cobordism hypothesis outlined
by Lurie is elaborate and inductive. Many consequences of the cobordism
hypothesis, such as the precise form of this O(n)-action, remain mysterious.
The aim of these lectures is to explain how this O(n)-action emerges in a range
of low category numbers ($n \leq 3$).
  The second part of these lecture notes focuses on the author's joint work
with Clark Barwick on the Unicity Theorem, as presented in arXiv:1112.0040.
This theorem and the accompanying machinery provide an axiomatization of the
theory of $(\infty,n)$-categories and several tools for verifying these axioms.
The aim of this portion of the lectures is to provide an introduction to this
material.


title:
Euclidean and Hermitian Self-orthogonal Algebraic Geometry Codes and
  Their Application to Quantum Codes

abstract:
  In the present paper, we show that if the dimension of an arbitrary algebraic
geometry code over a finite field of even characters is slightly less than half
of its length, then it is equivalent to an Euclidean self-orthogonal code.
However, in the literatures, a strong contrition about existence of certain
differential is required to obtain such a result. We also show a similar result
on Hermitian self-orthogonal algebraic geometry codes. As a consequence, we can
apply our result to quantum codes and obtain quantum codes with good asymptotic
bounds.


title: Optomechanical interface for probing matter-wave coherence

abstract:
  We combine matter-wave interferometry and cavity optomechanics to propose a
coherent matter--light interface based on mechanical motion at the quantum
level. We demonstrate a mechanism that is able to transfer non-classical
features imprinted on the state of a matter-wave system to an optomechanical
device, transducing them into distinctive interference fringes. This provides a
reliable tool for the inference of quantum coherence in the particle beam.
Moreover, we discuss how our system allows for intriguing perspectives, paving
the way to the construction of a device for the encoding of quantum information
in matter-wave systems. Our proposal, which highlights previously unforeseen
possibilities for the synergetic exploitation of these two experimental
platforms, is explicitly based on existing technology, available and widely
used in current cutting-edge experiments.


title:
A Construction of Quantum Codes via A Class of Classical Polynomial
  Codes

abstract:
  There have been various constructions of classical codes from polynomial
valuations in literature \cite{ARC04, LNX01,LX04,XF04,XL00}. In this paper, we
present a construction of classical codes based on polynomial construction
again. One of the features of this construction is that not only the classical
codes arisen from the construction have good parameters, but also quantum codes
with reasonably good parameters can be produced from these classical codes. In
particular, some new quantum codes are constructed (see Examples \ref{5.5} and
\ref{5.6}).


title: Quantum Gilbert-Varshamov Bound Through Symplectic Self-Orthogonal Codes

abstract:
  It is well known that quantum codes can be constructed through classical
symplectic self-orthogonal codes. In this paper, we give a kind of
Gilbert-Varshamov bound for symplectic self-orthogonal codes first and then
obtain the Gilbert-Varshamov bound for quantum codes. The idea of obtaining the
Gilbert-Varshamov bound for symplectic self-orthogonal codes follows from
counting arguments.


title:
ZigBee Based Wireless Data Acquisition Using LabVIEW for Implementing
  Smart Driving Skill Evaluation System

abstract:
  The Smart Driving Skill Evaluation (SDSE) System presented in this paper
expedite the testing of candidates aspiring for a driving license in a more
efficient and transparent manner, as compared to the present manual testing
procedure existing in most parts of Asia and Pacific region. The manual test
procedure is also subjected to multiple limitations like time consuming, costly
and heavily controlled by the experience of examiner in conducting the test.
This technological solution is developed by customizing 8051 controller based
embedded system and LabVIEW based virtual instrument. The controller module
senses the motion of the test vehicle on the test track referred to as zero rpm
measurement and the LabVIEW based virtual instrument provides a Graphical User
Interface for remote end monitoring of the sensors embedded on the test track.
The proposed technological solution for the automation of existing manual test
process enables the elimination of human intervention and improves the driving
test accuracy while going paperless with Driving Skill Evaluation System. As a
contribution to the society this technological solution can reduce the number
of road accidents because most accidents results from lack of planning,
anticipation and control which are highly dependent on driving skill.


title:
Distance and Proper Motion Measurement of the Red Supergiant, PZ Cas, in
  Very Long Baseline Interferometry H2O Maser Astrometry

abstract:
  We present the very long baseline interferometry H2O maser monitoring
observations of the red supergiant, PZ Cas, at 12 epochs from 2006 April to
2008 May. We fitted maser motions to a simple model composed of a common annual
parallax and linear motions of the individual masers. The maser motions with
the parallax subtracted were well modeled by a combination of a common stellar
proper motion and a radial expansion motion of the circumstellar envelope. We
obtained an annual parallax of 0.356+/-0.026 mas and a stellar proper motion of
{\mu}*{\alpha}cos{\delta}=-3.7+/-0.2 and {\mu}*{\delta}=-2.0+/-0.3 mas/yr
eastward and northward, respectively. The annual parallax corresponds to a
trigonometric parallax of 2.81+0.22-0.19 kpc. By rescaling the luminosity of PZ
Cas in any previous studies using our trigonometric parallax, we estimated the
location of PZ Cas on a Hertzsprung-Russell diagram and found that it
approaches a theoretically evolutionary track around an initial mass of
~25M(sun). The sky position and the distance to PZ Cas are consistent with the
OB association, Cas OB5, which is located in a molecular gas super shell. The
proper motion of PZ Cas is close to that of the OB stars and other red
supergiants in Cas OB5 measured by the Hipparcos satellite. We derived the
peculiar motion of PZ Cas of Us = 22.8+/-1.5, Vs = 7.1+/-4.4, and Ws =
-5.7+/-4.4 km/s. This peculiar motion has rather a large Us component, unlike
those of near high-mass star-forming regions with negatively large Vs motions.
The uniform proper motions of the Cas OB5 member stars suggest random motions
of giant molecular clouds moving into local potential minima in a
time-dependent spiral arm, rather than a velocity field caused by the spiral
arm density wave.


title: On classical q-deformations of integrable sigma-models

abstract:
  A procedure is developed for constructing deformations of integrable
sigma-models which are themselves classically integrable. When applied to the
principal chiral model on any compact Lie group F, one recovers the Yang-Baxter
sigma-model introduced a few years ago by C. Klimcik. In the case of the
symmetric space sigma-model on F/G we obtain a new one-parameter family of
integrable sigma-models. The actions of these models correspond to a
deformation of the target space geometry and include a torsion term. An
interesting feature of the construction is the q-deformation of the symmetry
corresponding to left multiplication in the original models, which becomes
replaced by a classical q-deformed Poisson-Hopf algebra. Another noteworthy
aspect of the deformation in the coset sigma-model case is that it interpolates
between a compact and a non-compact symmetric space. This is exemplified in the
case of the SU(2)/U(1) coset sigma-model which interpolates all the way to the
SU(1,1)/U(1) coset sigma-model.


title:
Transverse momentum spectra of hadrons identified with the ALICE Inner
  Tracking System

abstract:
  The Inner Tracking System is the ALICE detector closest to the beam axis. It
is composed of six layers of silicon detectors: two innermost layers of Silicon
Pixel Detectors (SPD), two intermediate layers of Silicon Drift Detectors (SDD)
and two outermost layers of Silicon Strip Detectors (SSD). The ITS can be used
as a standalone tracker in order to recover tracks that are not reconstructed
by the Time Projection Chamber (TPC) and to reconstruct low momentum particles
with $p_{t}$ down to 100 MeV/c. Particle identification in the ITS is performed
by measuring the energy loss signal in the SDD and SSD layers. The ITS allows
to extend the charged particle identification capability in the ALICE central
rapidity region at low $p_{t}$: it is possible to separate $\pi/K$ in the range
100 MeV/c $< p_{t} <$ 500 MeV/c and $K/p$ in the range 200 MeV/c $ < p_{t} <$
800 MeV/c. The identification of hadron in the ITS will be discussed in detail,
different methods used to extract the $p_{t}$ spectra of $\pi, K$ and $p$ will
also be described.


title: Integrability of BPS equations in ABJM theory

abstract:
  We investigate BPS equations which determine the configuration of an M2-M5
bound state preserving half of the supersymmetries in the ABJM theory. We argue
that the BPS equations are classically integrable, showing that they admit a
Lax representation. The integrable structure of the BPS equations is closely
related to that of the Nahm equations. Using this relation we formulate an
efficient way of constructing solutions of the BPS equations from those of the
Nahm equations. As an illustration of our method, we construct explicitly the
most general solutions describing two M2-branes suspended between two parallel
M5-branes as well as two semi-infinite M2-branes ending on an M5-brane. These
include previously unknown new solutions. We also discuss a reduction of the
BPS equations in connection with the periodic Toda chain.


title:
Estimating the tolerance of species to the effects of global
  environmental change

abstract:
  Global environmental change is affecting species distribution and their
interactions with other species. In particular, the main drivers of
environmental change strongly affect the strength of interspecific interactions
with considerable consequences to biodiversity. However, extrapolating the
effects observed on pair-wise interactions to entire ecological networks is
challenging. Here we propose a framework to estimate the tolerance to changes
in the strength of mutualistic interaction that species in mutualistic networks
can sustain before becoming extinct. We identify the scenarios where generalist
species can be the least tolerant. We show that the least tolerant species
across different scenarios do not appear to have uniquely common
characteristics. Species tolerance is extremely sensitive to the direction of
change in the strength of mutualistic interaction, as well as to the observed
mutualistic trade-offs between the number of partners and the strength of the
interactions.


title: Permutation groups and transformation semigroups: results and problems

abstract:
  J.M. Howie, the influential St Andrews semigroupist, claimed that we value an
area of pure mathematics to the extent that (a) it gives rise to arguments that
are deep and elegant, and (b) it has interesting interconnections with other
parts of pure mathematics.
  This paper surveys some recent results on the transformation semigroup
generated by a permutation group $G$ and a single non-permutation $a$. Our
particular concern is the influence that properties of $G$ (related to
homogeneity, transitivity and primitivity) have on the structure of the
semigroup. In the first part of the paper, we consider properties of $S=<G,a>$
such as regularity and idempotent generation. The second is a brief report on
the synchronization project, which aims to decide in what circumstances $S$
contains an element of rank 1. The paper closes with a list of open problems on
permutation groups and linear groups, and some comments about the impact on
semigroups are provided.
  These two research directions outlined above lead to very interesting and
challenging problems on primitive permutation groups whose solutions require
combining results from several different areas of mathematics, certainly
fulfilling both of Howie's elegance and value tests in a new and fascinating
way.


title: Abstract Tensor Systems as Monoidal Categories

abstract:
  The primary contribution of this paper is to give a formal, categorical
treatment to Penrose's abstract tensor notation, in the context of traced
symmetric monoidal categories. To do so, we introduce a typed, sum-free version
of an abstract tensor system and demonstrate the construction of its associated
category. We then show that the associated category of the free abstract tensor
system is in fact the free traced symmetric monoidal category on a monoidal
signature. A notable consequence of this result is a simple proof for the
soundness and completeness of the diagrammatic language for traced symmetric
monoidal categories.


title:
Combined analysis of the $K^{+}K^{-}$ interaction using near threshold
  $pp \to ppK^+K^-$ data

abstract:
  The $K^{+}K^{-}$ final state interaction was investigated based on both the
$K^{+}K^{-}$ invariant mass distributions measured at excess energies of Q = 10
and 28 MeV and the near threshold excitation function for the $pp \to
ppK^{+}K^{-}$ reaction. The $K^+K^-$ final state enhancement factor was
parametrized using the effective range expansion. The effective range of the
$K^+K^-$ interaction was estimated to be: $\mathrm{Re}(b_{K^{+}K^{-}}) = -0.1
\pm 0.4_{stat} \pm 0.3_{sys} \mathrm{fm}$ and $\mathrm{Im}(b_{K^{+}K^{-}}) =
1.2^{+0.1_{stat}+0.2_{sys}}_{-0.2_{stat}-0.0_{sys}} \mathrm{fm}$, and the
determined real and imaginary parts of the $K^+K^-$ scattering length amount
to: $|\mathrm{Re}(a_{K^{+}K^{-}})| = 8.0^{+6.0_{stat}}_{-4.0_{stat}}
\mathrm{fm}$ and $\mathrm{Im}(a_{K^{+}K^{-}}) =
0.0^{+20.0_{stat}}_{-5.0_{stat}} \mathrm{fm}$.


title:
Interactions in dye-microcavity photon condensates and the prospects for
  their observation

abstract:
  We derive the equation of motion for a Bose-Einstein condensate of photons in
a dye-microcavity system, starting from Maxwell's equations. Our theory takes
into account mirror shape, Kerr-type intensity-dependent refractive index and
incoherent pumping and loss. The resulting equation is remarkably similar to
the Gross-Pitaevskii equation for exciton-polariton condensates, despite the
different microscopic origins. We calculate the incoherent photoluminescence
spectrum of the photon condensate which shows the Bogoliubov-type excitations
around the mean-field at thermal equilibrium. Both open and closed-system
models are presented to account for, respectively dissipation and
inhomogeneities. Considering realistic parameters and experimental resolution,
we estimate that by observing the angle-resolved spectrum of incoherent
photoluminescence it is possible to resolve dimensionless interaction
parameters of order $10^{-5}$, two orders of magnitude below current estimates.
Thus we expect that this technique will lead to accurate measurements of the
interactions in photon condensates.


title: Universal deformation formulas

abstract:
  We give a conceptual explanation of universal deformation formulas for unital
associative algebras and prove some results on the structure of their moduli
spaces. We then generalize universal deformation formulas to other types of
algebras and their diagrams.


title: State-space modeling of dynamic genetic networks

abstract:
  The genomic reality is a highly complex and dynamic system. The recent
development of high-throughput technologies has enabled researchers to measure
the abundance of many genes (in the order of thousands) simultaneously. The
challenge is to unravel from such measurements, gene/protein or gene/gene or
protein/ protein interactions and key biological features of cellular systems.
Our goal is to devise a method for inferring transcriptional or gene regulatory
networks from high-throughput data sources such as gene expression microarrays
with potentially hidden states, such as unmeasured transcription factors (TFs),
which satisfies certain Markov properties. We propose a dynamic state space
representation. Our method is based on an EM algorithm with an incorporated
Kalman smoothing algorithm in the E-step, a bootstrap for confidence intervals
to infer the networks and the AIC for model selection. The state space model is
an approach with proven effectiveness to reverse engineer transcriptional
networks. The proposed method is applied to time course microarray data
obtained from well established T-cell. When we applied the method to the T-cell
data, we obtained 4, as the optimum number of hidden states. Our results
support interesting biological properties in the family of Jun genes. The
following genes were mostly seen as regulatory genes. These genes includes FYB,
CCNA2, AKT1, TRAF5, CASP4, and CTNNB1. We found interaction between Jun-B and
SMN1, and CDC2 activates Jun-D. We found few significant interactions or
one-to-one correspondence among the 4 putative transcription factors. Among the
important key genes in terms of outward-directed edges, we found genes such as
CCNA2, JUNB, CDC2, CASP4, JUND to have a high degree of connectivity. R
Computer source code is made available at our website at
http://www.math.rug.nl/stat/Main/Software.


title: A Penrose-Like Inequality with Charge

abstract:
  We establish a Penrose-like inequality for general (not necessarily
time-symmetric) initial data sets of the Einstein-Maxwell equations, which
satisfy the dominant energy condition. More precisely, it is shown that the ADM
energy is bounded below by an expression which is proportional to the sum of
the square root of the area of the outermost future (or past) apparent horizon
and the square of the total charge. The proportionality constants depend on the
solution to a linear elliptic equation which incorporates the charge. In
addition, a corrected version of the Penrose-like inequality in [13] is
presented.


title: Is there enough fertile soil to feed a planet of growing cities?

abstract:
  We analyze a scaling law for the consumption of agricultural soil by cities.
The nonlinear dependence of the size of the city on the number of inhabitants
gives rise to an equation for population dynamics. We found the asymptotic
limit of the solution for this equation, given by the carrying capacity in
terms of number of inhabitants that can be fed. The carrying capacity as a
function of the scaling law exponent is computed numerically, showing that the
exponent must be very small to ensure a food sustainability. We suggest a bound
for the value of this exponent and analyze the reliability of the scaling law
for major cities.


title: Vector Fields with a non-degenerate Source

abstract:
  We discuss the solution theory of operators of the form $\nabla_X + A$,
acting on smooth sections of a vector bundle with connection $\nabla$ over a
manifold $M$, where $X$ is a vector field having a critical point with positive
linearization at some point $p \in M$. As an operator on a suitable space of
smooth sections $\Gamma^\infty(U, \V)$, it fulfills a Fredholm alternative, and
the same is true for the adjoint operator. Furthermore, we show that the
solutions depend smoothly on the data $\nabla$, $X$ and $A$.


title:
Chemical Freeze-out of Strange Particles and Possible Root of
  Strangeness Suppression

abstract:
  Two approaches to treat the chemical freeze-out of strange particles in
hadron resonance gas model are analyzed. The first one employs their
non-equillibration via the usual \gamma_s factor and such a model describes the
hadron multiplicities measured in nucleus-nucleus collisions at AGS, SPS and
RHIC energies with \chi^2/dof = 1.15. Surprisingly, at low energies we find not
the strangeness suppression, but its enhancement. Also we suggest an
alternative approach to treat the strange particle freeze-out separately, but
with the full chemical equilibration. This approach is based on the
conservation laws which allow us to connect the freeze-outs of strange and
non-strange hadrons. Within the suggested approach the same set of hadron
multiplicities can be described better than within the conventional approach
with \chi^2/dof = 1.06. Remarkably, the fully equilibrated approach describes
the strange hyperons and antihyperons much better than the conventional one.


title: The promise of recent and future observatories and instruments

abstract:
  The identification of the carrier(s) of diffuse interstellar bands (DIBs) is
one of the oldest mysteries in stellar spectroscopy. With the advent of
8-10m-class telescopes substantial progress has been made in measuring the
properties of DIBs in the optical and near-infrared wavelength domain, not only
in the Galaxy, but also in different environments encountered in Local Group
galaxies and beyond. Still, the DIB carriers have remained unidentified. The
coming decade will witness the development of extremely large telescopes (GMT,
TMT and E-ELT) and their instrumentation. In this overview I will highlight the
current instrumentation plan of these future observatories, emphasizing their
potential role in solving the enigma of the DIBs.


title:
Spin Selection Rule-Based Sub-Millisecond Hyperpolarization of Nuclear
  Spins in Silicon

abstract:
  In this work, we devise a fast and effective nuclear spin hyperpolarization
scheme, which is in principle magnetic field and temperature independent. We
use this scheme to experimentally demonstrate polarizations of up to 66% for
phosphorus donor nuclear spins in bulk silicon, which are created within less
than 100 us in a magnetic field of 0.35 T at a temperature of 5 K. The
polarization scheme is based on a spin-dependent recombination process via
weakly-coupled spin pairs, for which the recombination time constant strongly
depends on the relative orientation of the two spins. We further use this
scheme to measure the nuclear spin relaxation time and find a value of approx.
100 ms under illumination, in good agreement with the value calculated for
nuclear spin flips induced by repeated ionization and deionization processes.


title:
The distribution of the logarithmic derivative of the Riemann
  zeta-function

abstract:
  We investigate the distribution of the logarithmic derivative of the Riemann
zeta-function on the line Re(s)=\sigma, where \sigma, lies in a certain range
near the critical line \sigma=1/2. For such \sigma, we show that the
distribution of \zeta'/\zeta(s) converges to a two-dimensional Gaussian
distribution in the complex plane. Upper bounds on the rate of convergence to
the Gaussian distribution are also obtained.


title:
Periodicity search as a tool for disentangling the contaminated colour
  light curve of CoRoT 102781750

abstract:
  The star CoRoT102781750 reveals a puzzle, showing a very complex and altering
variation in different `CoRoT colours'. We established without doubt that more
than a single star was situated within the CoRoT mask. Using a search for
periodicity as a tool, our aim is to disentangle the composite light curve and
identify the type of sources behind the variability. Both flux and magnitude
light curves were used. Conversion was applied after a jump- and
trend-filtering algorithm. We applied different types of period-finding
techniques including MuFrAn and Period04. The amplitude and phase peculiarities
obtained from the independent analysis of CoRoT r, g, and b colours and
ground-based follow-up photometric observations ruled out the possibility of
either a background monoperiodic or a Blazhko type RR Lyrae star being in the
mask. The main target, an active star, shows at least two spotted areas that
reveal a $P_rot = 8.8$ hours $(f_0 = 2.735$ c d$^{-1})$ mean rotation period.
The evolution of the active regions helped to derive a period change of $dP/dt
= 1.6\cdot 10^{-6}$ (18 s over the run) and a differential rotation of $\alpha
= \Delta\Omega/\Omega = 0.0074$. The $0\fm 015$ linear decrease and a local
$0\fm 005$ increase in the dominant period's amplitude are interpreted as a
decay of the old spotted region and an appearance of a new one, respectively. A
star that is detected only in the CoRoT b domain shows a $f_1 = 7.172$ c
d$^{-1}$ pulsation connected to a $14\fd 83$ periodicity via an equidistant
triplet structure. The best explanation for our observation is a $\beta$ Cep
star with a corotating dust disk.


title: Molecular alignment using circularly polarized laser pulses

abstract:
  We show that circularly polarized femtosecond laser pulses produce field-free
alignment in linear and planar molecules. We study the rotational wavepacket
evolution of O$_2$ and benzene created by circularly polarized light. For
benzene, we align the molecular plane to the plane of polarization. For O$_2$,
we demonstrate that circular polarization yields a net alignment along the
laser propagation axis at certain phases of the evolution. Circular
polarization gives us the ability to control alignment of linear molecules
outside the plane of polarization, providing new capabilities for molecular
imaging.


title:
Random Walks on Directed Networks: Inference and Respondent-driven
  Sampling

abstract:
  Respondent driven sampling (RDS) is a method often used to estimate
population properties (e.g. sexual risk behavior) in hard-to-reach populations.
It combines an effective modified snowball sampling methodology with an
estimation procedure that yields unbiased population estimates under the
assumption that the sampling process behaves like a random walk on the social
network of the population. Current RDS estimation methodology assumes that the
social network is undirected, i.e. that all edges are reciprocal. However,
empirical social networks in general also have non-reciprocated edges. To
account for this fact, we develop a new estimation method for RDS in the
presence of directed edges on the basis of random walks on directed networks.
We distinguish directed and undirected edges and consider the possibility that
the random walk returns to its current position in two steps through an
undirected edge. We derive estimators of the selection probabilities of
individuals as a function of the number of outgoing edges of sampled
individuals. We evaluate the performance of the proposed estimators on
artificial and empirical networks to show that they generally perform better
than existing methods. This is in particular the case when the fraction of
directed edges in the network is large.


title: The construction of good lattice rules and polynomial lattice rules

abstract:
  A comprehensive overview of lattice rules and polynomial lattice rules is
given for function spaces based on $\ell_p$ semi-norms. Good lattice rules and
polynomial lattice rules are defined as those obtaining worst-case errors
bounded by the optimal rate of convergence for the function space. The focus is
on algebraic rates of convergence $O(N^{-\alpha+\epsilon})$ for $\alpha \ge 1$
and any $\epsilon > 0$, where $\alpha$ is the decay of a series representation
of the integrand function. The dependence of the implied constant on the
dimension can be controlled by weights which determine the influence of the
different dimensions. Different types of weights are discussed. The
construction of good lattice rules, and polynomial lattice rules, can be done
using the same method for all $1 < p \le \infty$; but the case $p=1$ is special
from the construction point of view. For $1 < p \le \infty$ the
component-by-component construction and its fast algorithm for different
weighted function spaces is then discussed.


title: Infinite-dimensional statistical manifolds based on a balanced chart

abstract:
  We develop a family of infinite-dimensional Banach manifolds of measures on
an abstract measurable space, employing charts that are "balanced" between the
density and log-density functions. The manifolds,
$(\tilde{M}_{\lambda},\lambda\in [2,\infty))$, retain many of the features of
finite-dimensional information geometry; in particular, the
$\alpha$-divergences are of class $C^{\lceil\lambda\rceil-1}$, enabling the
definition of the Fisher metric and $\alpha$-derivatives of particular classes
of vector fields. Manifolds of probability measures, $(M_{\lambda},\lambda\in
[2,\infty))$, based on centred versions of the charts are shown to be
$C^{\lceil\lambda \rceil-1}$-embedded submanifolds of the
$\tilde{M}_{\lambda}$. The Fisher metric is a pseudo-Riemannian metric on
$\tilde{M}_{\lambda}$. However, when restricted to finite-dimensional embedded
submanifolds it becomes a Riemannian metric, allowing the full development of
the geometry of $\alpha$-covariant derivatives. $\tilde{M}_{\lambda}$ and
$M_{\lambda}$ provide natural settings for the study and comparison of
approximations to posterior distributions in problems of Bayesian estimation.


title: The geography and carbon footprint of mobile phone use in Cote d'Ivoire

abstract:
  The newly released Orange D4D mobile phone data base provides new insights
into the use of mobile technology in a developing country. Here we perform a
series of spatial data analyses that reveal important geographic aspects of
mobile phone use in Cote d'Ivoire. We first map the locations of base stations
with respect to the population distribution and the number and duration of
calls at each base station. On this basis, we estimate the energy consumed by
the mobile phone network. Finally, we perform an analysis of inter-city
mobility, and identify high-traffic roads in the country.


title: An approximation principle for congruence subgroups

abstract:
  The motivating question of this paper is roughly the following: given a group
scheme $G$ over $\mathbb{Z}_p$, $p$ prime, with semisimple generic fiber
$G_{\mathbb{Q}_p}$, how far are open subgroups of $G(\mathbb{Z}_p)$ from
subgroups of the form $X(\mathbb{Z}_p)\mathbf{K}_p(p^n)$, where $X$ is a
subgroup scheme of $G$ and $\mathbf{K}_p(p^n)$ is the principal congruence
subgroup $\operatorname{Ker} (G(\mathbb{Z}_p)\rightarrow
G(\mathbb{Z}/p^n\mathbb{Z}))$? More precisely, we will show that for
$G_{\mathbb{Q}_p}$ simply connected there exist constants $J\ge1$ and
$\varepsilon>0$, depending only on $G$, such that any open subgroup of $G
(\mathbb{Z}_p)$ of level $p^n$ admits an open subgroup of index $\le J$ which
is contained in $X(\mathbb{Z}_p)\mathbf{K}_p(p^{\lceil \varepsilon n\rceil})$
for some proper connected algebraic subgroup $X$ of $G$ defined over
$\mathbb{Q}_p$. Moreover, if $G$ is defined over $\mathbb{Z}$, then
$\varepsilon$ and $J$ can be taken independently of $p$. We also give a
correspondence between natural classes of $\mathbb{Z}_p$-Lie subalgebras of
$\mathfrak{g}_{\mathbb{Z}_p}$ and of closed subgroups of $G(\mathbb{Z}_p)$ that
can be regarded as a variant over $\mathbb{Z}_p$ of Nori's results on the
structure of finite subgroups of $\operatorname{GL}(N_0,\mathbb{F}_p)$ for
large $p$. As an application we give a bound for the volume of the intersection
of a conjugacy class in the group $G (\hat{\mathbb{Z}}) = \prod_p G
(\mathbb{Z}_p)$, for $G$ defined over $\mathbb{Z}$, with an arbitrary open
subgroup. In a future paper, this result will be applied to the limit
multiplicity problem for arbitrary congruence subgroups of the arithmetic
lattice $G (\mathbb{Z})$.


title: Applications of neutron activation spectroscopy

abstract:
  Since the discovery in 1932, neutrons became a basis of many methods used not
only in research, but also in industry and engineering. Among others, the
exceptional role in the modern nuclear engineering is played by the neutron
activation spectroscopy, based on the interaction of neutron flux with atomic
nuclei. In this article we shortly describe application of this method in
medicine and detection of hazardous substances.


title: On fractional Laplacians

abstract:
  We compare two natural types of fractional Laplacians $(-\Delta)^s$, "Navier"
and "Dirichlet" ones. We show that for $0<s<1$ their difference is positive
definite and positivity preserving. Then we prove the coincidence of the
Sobolev constants for these two fractional Laplacians.


title: Harmonic functions on metric measure spaces

abstract:
  In this paper, we study harmonic functions on metric measure spaces with
Riemannian Ricci curvature bounded from below, which were introduced by
Ambrosio-Gigli-Savar\'e. We prove a Cheng-Yau type local gradient estimate for
harmonic functions on these spaces. Furthermore, we derive various optimal
dimension estimates for spaces of polynomial growth harmonic functions on
metric measure spaces with nonnegative Riemannian Ricci curvature.


title: Rheological fluid motion in tube by metachronal wave of cilia

abstract:
  This paper presents a theoretical study of a non-linear rheological fluid
transport in an axisymmetric tube by cilia. However, an attempt has been made
to explain the role of cilia motion on the transport of fluid through the
ductus efferentes of the male reproductive tract. Ostwald-de Waele power-law
viscous fluid has been considered to represent the rheological fluid. To
analyze pumping by means of a sequence of beat of cilia from row-to-row of
cilia in a given row of cells and from one row of cells to the next
(metachronal wave movement), we consider the conditions that the corresponding
Reynolds number is small enough for inertial effects to be negligible and the
wavelength to diameter ratio is large enough for the pressure to be considered
uniform over the cross-section. Analyses and computations of the detailed fluid
motion reveal that the time-averaged flow rate is dependent on $\epsilon$, a
non-dimensional measure involving the mean radius $a$ of the tube and the cilia
length. Thus, flow rate significantly varies with the cilia length. Moreover,
the flow rate has been reported near to the estimated value $6\times
10^{-3}$$ml/h$ for human efferent ducts if $\epsilon$ is near by 0.4. The
estimated value was suggested by Lardner and Shack [1] in human, based on the
experimental observations for flow rates in efferent ducts of other animals,
e.g., rat, ram and bull. In addition, the nature of the rheological fluid,
i.e., the value of the fluid index $n$ strongly influences various
flow-governed characteristics. The interesting feature of the paper is that the
pumping improves with the thickening behavior for small values of $\epsilon$ or
in free pumping ($\Delta P=0$) and pumping ($\Delta P>0$) regions.


title: Local gradient estimate for harmonic functions on Finsler manifolds

abstract:
  In this paper, we prove the local gradient estimate for harmonic functions on
complete, noncompact Finsler measure spaces under the condition that the
weighted Ricci curvature has a lower bound. As applications, we obtain
Liouville type theorem on Finsler manifolds with nonnegative Ricci curvature.


title:
Study of the $K^+K^-$ final state interaction in proton-proton and
  electron-positron collisions

abstract:
  The strength of the kaon--antikaon interaction is a crucial quantity for many
physics topics. It is for example, an important parameter in the discussion on
the nature of the scalar resonances $a_{0}(980)$ and $f_{0}(980)$, in
particular for their interpretation as $K\bar{K}$ molecules. So far, one of the
few possibilities to study this interaction is the kaon pair production in
multi particle exit channels like $pp \to ppK^+K^-$. In this article we present
the latest results of the $K^+K^-$ interaction preformed based on near
threshold data gathered at the Cooler Synchrotron COSY. We discuss also shortly
perspectives for a new measurement of the kaon--antikaon scattering length in
the $e^+e^-$ collisions.


title:
Theoretical Raman fingerprints of $\alpha$-, $\beta$-, and
  $\gamma$-graphyne

abstract:
  The novel graphene allotropes $\alpha$-, $\beta$-, and $\gamma$-graphyne
derive from graphene by insertion of acetylenic groups. The three graphynes are
the only members of the graphyne family with the same hexagonal symmetry as
graphene itself, which has as a consequence similarity in their electronic and
vibrational properties. Here, we study the electronic band structure, phonon
dispersion, and Raman spectra of these graphynes within an
\textit{ab-initio}-based non-orthogonal tight-binding model. In particular, the
predicted Raman spectra exhibit a few intense resonant Raman lines, which can
be used for identification of the three graphynes by their Raman spectra for
future applications in nanoelectronics.


title:
Visualizing the morphology of vortex lattice domains in a bulk type-II
  superconductor

abstract:
  Analogous to the various states of condensed matter exhibiting crystalline,
amorphous, liquid and spatially inhomogeneous phases, such structures are
likewise observed in superconducting vortex matter.


title: Polynomial kernels collapse the W-hierarchy

abstract:
  We prove that, for many parameterized problems in the class FPT, the
existence of polynomial kernels implies the collapse of the W-hierarchy (i.e.,
W[P] = FPT). The collapsing results are also extended to assumed exponential
kernels for problems in the class FPT. In particular, we establish a close
relationship between polynomial (and exponential) kernelizability and the
existence of sub-exponential time algorithms for a spectrum of circuit
satisfiability problems in FPT. To the best of our knowledge, this is the first
work that connects hardness for polynomial kernelizability of FPT problems to
parameterized intractability. Our work also offers some new insights into the
class FPT.


title: Enhanced photon correlations due to strong laser-atom-cavity coupling

abstract:
  We investigate the resonant quantum dynamics of a laser-pumped real or
artificial two-level single-atom system embedded in a leaking microcavity. We
found that for stronger laser-atom-cavity couplings the generated microcavity
photons exhibit larger steady-state correlations. In particular, the second-
and third-order photon correlation functions are greater than the corresponding
ones obtained for an incoherent light source, respectively. Furthermore, the
emitted microcavity photon flux is enhanced in comparison to weaker coupling
cases.


title:
QuPARA: Query-Driven Large-Scale Portfolio Aggregate Risk Analysis on
  MapReduce

abstract:
  Stochastic simulation techniques are used for portfolio risk analysis. Risk
portfolios may consist of thousands of reinsurance contracts covering millions
of insured locations. To quantify risk each portfolio must be evaluated in up
to a million simulation trials, each capturing a different possible sequence of
catastrophic events over the course of a contractual year. In this paper, we
explore the design of a flexible framework for portfolio risk analysis that
facilitates answering a rich variety of catastrophic risk queries. Rather than
aggregating simulation data in order to produce a small set of high-level risk
metrics efficiently (as is often done in production risk management systems),
the focus here is on allowing the user to pose queries on unaggregated or
partially aggregated data. The goal is to provide a flexible framework that can
be used by analysts to answer a wide variety of unanticipated but natural ad
hoc queries. Such detailed queries can help actuaries or underwriters to better
understand the multiple dimensions (e.g., spatial correlation, seasonality,
peril features, construction features, and financial terms) that can impact
portfolio risk. We implemented a prototype system, called QuPARA (Query-Driven
Large-Scale Portfolio Aggregate Risk Analysis), using Hadoop, which is Apache's
implementation of the MapReduce paradigm. This allows the user to take
advantage of large parallel compute servers in order to answer ad hoc risk
analysis queries efficiently even on very large data sets typically encountered
in practice. We describe the design and implementation of QuPARA and present
experimental results that demonstrate its feasibility. A full portfolio risk
analysis run consisting of a 1,000,000 trial simulation, with 1,000 events per
trial, and 3,200 risk transfer contracts can be completed on a 16-node Hadoop
cluster in just over 20 minutes.


title:
Complexity in animal communication: Estimating the size of N-Gram
  structures

abstract:
  In this paper, new techniques that allow conditional entropy to estimate the
combinatorics of symbols are applied to animal communication studies to
estimate the communication's repertoire size. By using the conditional entropy
estimates at multiple orders, the paper estimates the total repertoire sizes
for animal communication across bottlenose dolphins, humpback whales, and
several species of birds for N-grams length one to three. In addition to
discussing the impact of this method on studies of animal communication
complexity, the reliability of these estimates is compared to other methods
through simulation. While entropy does undercount the total repertoire size due
to rare N-grams, it gives a more accurate picture of the most frequently used
repertoire than just repertoire size alone.


title:
The peculiar light curve of the Symbiotic Star AX Per of the last 125
  years

abstract:
  We analyze the last 125 years optical light curve of the symbiotic star AX
Per through some remarkable correlations that we discovered in its power
spectrum. The data were assembled from the literature and from the AAVSO
database. A series of 6 major outbursts dominate the light curve. They are
presented in the power spectrum as 13 harmonics of the fundamental frequency
fa=1/Pa=1/23172 day-1. We refer to them as the "red" frequencies. Oscillations
with the binary periodicity of the system Pb=1/fb=681.48 d are also seen in the
light curve, with particularly large amplitudes during outbursts. The fb peak
in the power spectrum is accompanied by 13 other peaks on each side, to which
we refer as the "blue" frequencies. A distinct structure in the frequency
distribution of the blue peaks, as well as in their peak power are best
interpreted as reflecting beating of the 13 "red" frequencies with the binary
one. We suggest, following others, that the major outbursts of the system
result from events of intense mass loss from the giant star. Mass accretion
onto the hot component, partially through the L1 point of the system, took
place in the last 125 years at a rate that oscillated with the 13 first
harmonics of the fa frequency. The binary orbit is slightly eccentric and
periastron passages induced modulation of the L1 accretion at the binary
frequency. Hence the fb oscillations in the brightness of the star of amplitude
that is modulated by the "red" frequencies of the system.


title:
Multiferroicity in the generic easy-plane triangular lattice
  antiferromagnet RbFe(MoO4)2

abstract:
  RbFe(MoO4)2 is a quasi-two-dimensional (quasi-2D) triangular lattice
antiferromagnet (TLA) that displays a zero-field magnetically-driven
multiferroic phase with a chiral spin structure. By inelastic neutron
scattering, we determine quantitatively the spin Hamiltonian. We show that the
easy-plane anisotropy is nearly 1/3 of the dominant spin exchange, making
RbFe(MoO4)2 an excellent system for studying the physics of the model 2D
easy-plane TLA. Our measurements demonstrate magnetic-field induced
fluctuations in this material to stabilize the generic finite-field phases of
the 2D XY TLA. We further explain how Dzyaloshinskii-Moriya interactions can
generate ferroelectricity only in the zero field phase. Our conclusion is that
multiferroicity in RbFe(MoO4)2, and its absence at high fields, results from
the generic properties of the 2D XY TLA.


title: A trace partitioned Gray code for q-ary generalized Fibonacci strings

abstract:
  We provide a trace partitioned Gray code for the set of q-ary strings
avoiding a pattern constituted by k consecutive equal symbols. The definition
of this Gray code is based on two different constructions, according to the
parity of q. This result generalizes, and is based on, a Gray code for binary
strings avoiding k consecutive 0's.


title:
Statistics of turbulent fluctuations in counter-rotating Taylor-Couette
  flows

abstract:
  The statistics of velocity fluctuations of turbulent Taylor-Couette flow are
examined. The rotation rate of the inner and outer cylinder are varied while
keeping the Taylor number fixed to $1.49 \times 10^{12}$
($\mathcal{O}(\text{Re})=10^6$). The azimuthal velocity component of the flow
is measured using laser Doppler anemometry (LDA). For each experiment
$5\times10^6$ datapoints are acquired and carefully analysed. Using extended
self-similarity (ESS) \cite{ben93b} the longitudinal structure function
exponents are extracted, and are found to weakly depend on the ratio of the
rotation rates. For the case where only the inner cylinder rotates the results
are in good agreement with results measured by Lewis and Swinney \cite{lew99}
using hot-film anemometry. The power spectra shows clear -5/3 scaling for the
intermediate angular velocity ratios $-\omega_o/\omega_i \in \{0.6, 0.8,
1.0\}$, roughly -5/3 scaling for $-\omega_o/\omega_i \in \{0.2, 0.3, 0.4,
2.0\}$, and no clear scaling law can be found for $-\omega_0/\omega_i = 0$
(inner cylinder rotation only); the local scaling exponent of the spectra has a
strong frequency dependence. We relate these observations to the shape of the
probability density function of the azimuthal velocity and the presence of a
neutral line.


title: Thermodynamics of QCD at vanishing density

abstract:
  We study the phase structure of QCD at finite temperature within a
Polyakov-loop enhanced quark-meson model. Such a model describes the chiral as
well as the confinement-deconfinement dynamics. In the present investigation,
based on the approach and results put forward in [1-4], both, matter as well as
glue fluctuations are included. We present results for the order parameters as
well as some thermodynamic observables and find very good agreement with recent
results from lattice QCD.


title: An Educational Kit Based on a Modular Silicon Photomultiplier System

abstract:
  Silicon Photo-Multipliers (SiPM) are state of the art light detectors with
unprecedented single photon sensitivity and photon number resolving capability,
representing a breakthrough in several fundamental and applied Science domains.
An educational experiment based on a SiPM set-up is proposed in this article,
guiding the student towards a comprehensive knowledge of this sensor technology
while experiencing the quantum nature of light and exploring the statistical
properties of the light pulses emitted by a LED.


title:
Measurement of identified charged hadron spectra with the ALICE
  experiment at the LHC

abstract:
  The ALICE experiment features multiple particle identification systems. The
measurement of the identified charged hadron $p_{t}$ spectra in proton-proton
collisions at $\sqrt{s}=900$ GeV will be discussed. In the central rapidity
region ($|\eta|<0.9$) particle identification and tracking are performed using
the Inner Tracking System (ITS), which is the closest detector to the beam
axis, the Time Projection Chamber (TPC) and a dedicated time-of-flight system
(TOF). Particles are mainly identified using the energy loss signal in the ITS
and TPC. In addition, the information from TOF is used to identify hadrons at
higher momenta. Finally, the kink topology of the weak decay of charged kaons
provides an alternative method to extract the transverse momentum spectra of
charged kaons. This combination allows to track and identify charged hadrons in
the transverse momentum ($p_{t}$) range from 100 MeV/c up to 2.5 GeV/$c$.
Mesons containing strange quarks (\kos, $\phi$) and both singly and doubly
strange baryons (\lam, \lambar, and \xip + \xim) are identified by their decay
topology inside the TPC detector. Results obtained with the various
identification tools above described and a comparison with theoretical models
and previously published data will be presented.


title: A Multivariate Functional Limit Theorem in Weak M1 Topology

abstract:
  We show a new functional limit theorem for weakly dependent regularly varying
sequences of random vectors. As it turns out, the convergence takes place in
the space of R^d valued c\`{a}dl\`{a}g functions endowed with the so-called
weak M1 topology. The theory is illustrated on two examples. In particular, we
demonstrate why such an extension of Skorohod's M1 topology is actually
necessary for the limit theorem to hold.


title:
Could $Z_{c}(4025)$ be a $J^{P}=1^{+}$ $D^{*}\bar{D^{*}}$ molecular
  state?

abstract:
  We investigate whether the newly observed narrow resonance $Z_{c}(4025)$ can
be described as a $D^{*}\bar{D^{*}}$ molecular state with quantum numbers
$J^{P}=1^{+}$. Using QCD sum rules, we consider contributions up to dimension
six in the operator product expansion and work at leading order of
$\alpha_{s}$. The mass obtained for this state is $(4.05\pm 0.28) \mbox{GeV}$.
It is concluded that $D^{*}\bar{D^{*}}$ molecular state is a possible candidate
for $Z_{c}(4025)$.


title:
Tunable critical supercurrent and spin-asymmetric Josephson effect in
  superlattices

abstract:
  Combining the Josephson effect with magnetism, or spin dependence in general,
creates novel physical phenomena. The spin-asymmetric Josephson effect is a
predicted phenomenon where a spin-dependent potential applied across a
Josephson junction induces a spin-polarized Josephson current. Here, we propose
an approach to observe the spin-asymmetric Josephson effect with spin-dependent
superlattices, realizable, e.g., in ultracold atomic gases. We show that
observing this effect is feasible by studying numerically the quantum dynamics
of the system in one dimension. Furthermore, we show that the enhancement, or
tunability, of the critical supercurrent in ferromagnetic Josephson junctions
[F. S. Bergeret, A. F. Volkov, and K. B. Efetov, Phys. Rev. Lett. 86, 3140
(2001)] can be explained by the spin-asymmetric Josephson effect.


title:
Consistent description of kinetics and hydrodynamics of weakly
  nonequilibrium processes in simple liquids

abstract:
  The generalized transport equations for a consistent description of kinetic
and hydrodynamic processes in dense gases and liquids are considered. The inner
structure of the generalized transport kernels for these equations is
established. It is shown how in this approach to obtain the transport equation
of molecular hydrodynamics. For the model potential of interaction presented as
a sum of the hard spheres potential and certain long-range potential a spectrum
of collective modes in the system is investigated.


title:
On the number of peaks of the eigenfunctions of the linearized Gel'fand
  problem

abstract:
  We derive a second order estimate for the first m eigenvalues and
eigenfunctions of the linearized Gel'fand problem associated to solutions which
blow-up at m points. This allows us to determine, in some suitable situations,
some qualitative properties of the first m eigenfunctions as the number of
points of concentration or the multiplicity of the eigenvalue .


title: The Szlenk Index of L_p(X)

abstract:
  We find an optimal upper bound on the values of the weak$^*$-dentability
index $Dz(X)$ in terms of the Szlenk index $Sz(X)$ of a Banach space $X$ with
separable dual. Namely, if $\;Sz(X)=\omega^{\alpha}$, for some
$\alpha<\omega_1$, and $p\in(1,\infty)$, then
  $$Sz(X)\le Dz(X)\le Sz(L_p(X))\le {cases} \omega^{\alpha+1} &\text{if
$\alpha$ is a finite ordinal,}
  \omega^{\alpha} &\text{if $\alpha$ is an infinite ordinal.}
  {cases}$$


title: C*-Envelopes of Jordan Operator Systems

abstract:
  We determine the boundary representations and the C*-envelope of operator
systems of the form span{I,T,T*}, where T is a Jordan operator.


title: Spectral gaps of AKLT Hamiltonians using Tensor Network methods

abstract:
  Using exact diagonalization and tensor network techniques we compute the gap
for the AKLT Hamiltonian in 1D and 2D spatial dimensions. Tensor Network
methods are used to extract physical properties directly in the thermodynamic
limit, and we support these results using finite-size scalings from exact
diagonalization. Studying the AKLT Hamiltonian perturbed by an external field,
we show how to obtain an accurate value of the gap of the original AKLT
Hamiltonian from the field value at which the ground state verifies e_0<0,
which is a quantum critical point. With the Tensor Network Renormalization
Group methods we provide evidence of a finite gap in the thermodynamic limit
for the AKLT models in the 1D chain and 2D hexagonal and square lattices. This
method can be applied generally to Hamiltonians with rotational symmetry, and
we also show results beyond the AKLT model.


title: On Kirillov's lemma for nilpotent Lie algebras

abstract:
  We establish a sharpening of Kirillov's lemma on nilpotent Lie algebras with
1-dimensional center and use it to study the structure of 3-step nilpotent Lie
algebras.


title: Lepton Dipole Moments in Supersymmetric Low-Scale Seesaw Models

abstract:
  We study the anomalous magnetic and electric dipole moments of charged
leptons in supersymmetric low-scale seesaw models with right-handed neutrino
superfields. We consider a minimally extended framework of minimal
supergravity, by assuming that CP violation originates from complex soft
SUSY-breaking bilinear and trilinear couplings associated with the right-handed
sneutrino sector. We present numerical estimates of the muon anomalous magnetic
moment and the electron electric dipole moment (EDM), as functions of key model
parameters, such as the Majorana mass scale mN and tan(\beta). In particular,
we find that the contributions of the singlet heavy neutrinos and sneutrinos to
the electron EDM are naturally small in this model, of order 10^{-27} -
10^{-28} e cm, and can be probed in the present and future experiments.


title: Orbifold Gromov-Witten Invariants of Weighted Blow-up at Smooth Points

abstract:
  In this paper, one considers the change of orbifold Gromov-Witten invariants
under weighted blow-up at smooth points. Some blow-up formula for Gromov-Witten
invariants of symplectic orbifolds is proved. These results extend the results
of manifolds case to orbifold case.


title: Implementation of chromomagnetic gluons in Yang-Mills thermodynamics

abstract:
  Motivated by the recent high-precision lattice data on Yang-Mills equations
of state, we propose an effective theory of SU(3) gluonic matter. The theory is
constructed based on the center and scale symmetries and their dynamical
breaking, so that the interplay between color-electric and color-magnetic
gluons is included coherently. We suggest, that the magnetic gluon condensate
changes its thermal behavior qualitatively above the critical temperature, as a
consequence of the matching to dimensionally-reduced magnetic theories. We
consider thermodynamics in the mean field approximation and discuss the
properties and interpretation of the trace anomaly.


title: Newly-Discovered Globular Clusters in NGC 147 and NGC 185 from PAndAS

abstract:
  Using data from the Pan-Andromeda Archaeological Survey (PAndAS), we have
discovered four new globular clusters (GCs) associated with the M31 dwarf
elliptical (dE) satellites NGC 147 and NGC 185. Three of these are associated
with NGC 147 and one with NGC 185. All lie beyond the main optical boundaries
of the galaxies and are the most remote clusters yet known in these systems.
Radial velocities derived from low resolution spectra are used to argue that
the GCs are bound to the dwarfs and are not part of the M31 halo population.
Combining PAndAS with UKIRT/WFCAM data, we present the first homogeneous
optical and near-IR photometry for the entire GC systems of these dEs.
Colour-colour plots and published colour-metallicity relations are employed to
constrain GC ages and metallicities. It is demonstrated that the clusters are
in general metal poor ([Fe/H] < -1.25 dex), while the ages are more difficult
to constrain. The mean (V-I)$_0$ colours of the two GC systems are very similar
to those of the GC systems of dEs in the Virgo and Fornax clusters, as well as
the extended halo GC population in M31. The new clusters bring the GC specific
frequency (S_N) to ~9 in NGC 147 and ~5 in NGC 185, consistent with values
found for dEs of similar luminosity residing in a range of environments.


title:
Neutron-skin thickness of 208Pb from the energy of the anti-analog giant
  dipole resonance

abstract:
  The energy of the charge-exchange Anti-analog Giant Dipole Resonance (AGDR)
has been calculated for the 208Pb isotope using the state-of-the-art fully
self-consistent relativistic proton-neutron quasiparticle random-phase
approximation based on the Relativistic Hartree-Bogoliubov model. It is shown
that the AGDR centroid energy is very sensitively related to the corresponding
neutron-skin thickness. The neutron-skin thickness of 208Pb has been determined
very precisely by comparing the theoretical results with the available
experimental data on E(AGDR). The result DR(pn)= 0.161(42) agrees nicely with
the previous experimental results.


title: J/Psi in high-multiplicity pp collisions: lessons from pA

abstract:
  Gluons at small x in high-energy nuclei overlap in the longitudinal
direction, so the nucleus acts as a single source of gluons, like higher Fock
components in a single nucleon, which contribute to inelastic collisions with a
high multiplicity of produced hadrons. This similarity helps to make a link
between nuclear effects in pA and high-multiplicity pp collisions. Such a
relation is well confirmed by data for the J/Psi production rate in
high-multiplicity pp events measured recently in the ALICE experiment.
Broadening of J/Psi transverse momentum is predicted for high-multiplicity pp
collisions.


title:
A numerical method for the solution of relaxed one-sided Lipschitz
  algebraic inclusions

abstract:
  An existing solvability result for relaxed one-sided Lipschitz algebraic
inclusions is substantially improved. This enhanced solvability result allows
the design of a very robust numerical method for the approximation of a
solution of the algebraic inclusion. Sharp error estimates for this method,
illustrative analytic examples and a numerical example are provided.


title:
Isomorphic universality and the number of pairwise non-isomorphic models
  in the class of Banach spaces

abstract:
  We study isomorphic universality of Banach spaces of a given density and a
number of pairwise non-isomorphic models in the same class. We show that in the
Cohen model the isomorphic universality number for Banach spaces of density
$\aleph_1$ is $\aleph_2$, and analogous results are true for other cardinals
(Theorem 1.2(1)) and that adding just one Cohen real to any model destroys the
old universality of Banach spaces of density $\aleph_1$ (Theorem 1.5).
Moreover, adding one Cohen real adds a weakly compactly generated Banach space
of density $\aleph_1$ which does not embed into any Banach space of density
$\aleph_1$ in the ground model. We develop the framework of natural spaces to
study isomorphic embeddings of Banach spaces and use it to show that a
sufficient failure of the generalized continuum hypothesis implies that the
universality number of Banach spaces of a given density under a certain kind of
positive embeddings (very positive embeddings), is high (Theorem 4.8(1)), and
similarly for the number of pairwise non-isomorphic models (Theorem 4.8(2)).


title: Semi-implicit Euler schemes for ordinary differential inclusions

abstract:
  Two semi-implicit Euler schemes for differential inclusions are proposed and
analyzed in depth. An error analysis shows that both semi-implicit schemes
inherit favorable stability properties from the differential inclusion. Their
performance is considerably better than that of the implicit Euler scheme,
because instead of implicit inclusions only implicit equations have to be
solved for computing their images. In addition, they are more robust with
respect to spatial discretization than the implicit Euler scheme.


title:
Local existence and uniqueness for exterior static vacuum Einstein
  metrics

abstract:
  We study solutions to the static vacuum Einstein equations on exterior
domains with prescribed metric and mean curvature on the inner boundary. It is
proved that for any such boundary data near the standard round boundary data in
Euclidean space, there exists a unique AF solution to the static vacuum
equations realizing the boundary data, which is close to the standard flat
solution.


title:
Robust boundary tracking for reachable sets of nonlinear differential
  inclusions

abstract:
  The Euler scheme is up to date the most important numerical method for
ordinary differential inclusions, because the use of the available higher-order
methods is prohibited by their enormous complexity after spatial
discretization. Therefore, it makes sense to reassess the Euler scheme and
optimize its performance. In the present paper, a considerable reduction of the
computational cost is achieved by setting up a numerical method that computes
the boundaries instead of the complete reachable sets of the fully discretized
Euler scheme from lower-dimensional data only. Rigorous proofs for the
propriety of this method are given, and numerical examples illustrate the gain
of computational efficiency as well as the robustness of the scheme against
changes of topology of the reachable sets.


title:
Astrophysically robust systematics removal using variational inference:
  application to the first month of Kepler data

abstract:
  Space-based transit search missions such as Kepler are collecting large
numbers of stellar light curves of unprecedented photometric precision and time
coverage. However, before this scientific goldmine can be exploited fully, the
data must be cleaned of instrumental artefacts. We present a new method to
correct common-mode systematics in large ensembles of very high precision light
curves. It is based on a Bayesian linear basis model and uses shrinkage priors
for robustness, variational inference for speed, and a de-noising step based on
empirical mode decomposition to prevent the introduction of spurious noise into
the corrected light curves. After demonstrating the performance of our method
on a synthetic dataset, we apply it to the first month of Kepler data. We
compare the results, which are publicly available, to the output of the Kepler
pipeline's pre-search data conditioning, and show that the two generally give
similar results, but the light curves corrected using our approach have lower
scatter, on average, on both long and short timescales. We finish by discussing
some limitations of our method and outlining some avenues for further
development. The trend-corrected data produced by our approach are publicly
available.


title:
The Suborbital Particle Aggregation and Collision Experiment (SPACE):
  Studying the Collision Behavior of Submillimeter-Sized Dust Aggregates on the
  Suborbital Rocket Flight REXUS 12

abstract:
  The Suborbital Particle Aggregation and Collision Experiment (SPACE) is a
novel approach to study the collision properties of submillimeter-sized, highly
porous dust aggregates. The experiment was designed, built and carried out to
increase our knowledge about the processes dominating the first phase of planet
formation. During this phase, the growth of planetary precursors occurs by
agglomeration of micrometer-sized dust grains into aggregates of at least
millimeters to centimeters in size. However, the formation of larger bodies
from the so-formed building blocks is not yet fully understood. Recent
numerical models on dust growth lack a particular support by experimental
studies in the size range of submillimeters, because these particles are
predicted to collide at very gentle relative velocities of below 1 cm/s that
can only be achieved in a reduced-gravity environment.
  The SPACE experiment investigates the collision behavior of an ensemble of
silicate-dust aggregates inside several evacuated glass containers which are
being agitated by a shaker to induce the desired collisions at chosen
velocities. The dust aggregates are being observed by a high-speed camera,
allowing for the determination of the collision properties of the
protoplanetary dust analog material. The data obtained from the suborbital
flight with the REXUS (Rocket Experiments for University Students) 12 rocket
will be directly implemented into a state-of-the-art dust growth and collision
model.


title: Interpreting Cross-correlations of One-bit Filtered Seismic Noise

abstract:
  Seismic noise, generated by oceanic microseisms and other sources,
illuminates the crust in a manner different from tectonic sources, and
therefore provides independent information. The primary measurable is the
two-point cross-correlation, evaluated using traces recorded at a pair of
seismometers over a finite-time interval. However, raw seismic traces contain
intermittent large-amplitude perturbations arising from tectonic activity and
instrumental errors, which may corrupt the estimated cross-correlations of
microseismic fluctuations. In order to diminish the impact of these
perturbations, the recorded traces are filtered using the nonlinear one-bit
digitizer, which replaces the measurement by its sign. Previous theory shows
that for stationary Gaussian-distributed seismic noise fluctuations one-bit and
raw correlation functions are related by a simple invertible transformation.
Here we extend this to show that the simple correspondence between these two
correlation techniques remains valid for {\it non-stationary} Gaussian and a
very broad range of {\it non-Gaussian} processes as well. For a limited range
of stationary and non-stationary Gaussian fluctuations, we find that one-bit
filtering performs at least as well as spectral whitening. We therefore
recommend using one-bit filtering when processing terrestrial seismic noise,
with the substantial benefit that the measurements are fully compatible with
current theoretical interpretation (e.g., adjoint theory). Given that seismic
records are non-stationary and comprise small-amplitude fluctuations and
intermittent, large-amplitude tectonic/other perturbations, we outline an
algorithm to accurately retrieve the correlation function of the
small-amplitude signals.


title:
Bifurcation analysis of a smoothed model of a forced impacting beam and
  comparison with an experiment

abstract:
  A piecewise-linear model with a single degree of freedom is derived from
first principles for a driven vertical cantilever beam with a localized mass
and symmetric stops. The resulting piecewise-linear dynamical system is
smoothed by a switching function (nonlinear homotopy). For the chosen smoothing
function it is shown that the smoothing can induce bifurcations in certain
parameter regimes. These induced bifurcations disappear when the transition of
the switching is sufficiently and increasingly localized as the impact becomes
harder. The bifurcation structure of the impact oscillator response is
investigated via the one- and two-parameter continuation of periodic orbits in
the driving frequency and/or forcing amplitude. The results are in good
agreement with experimental measurements.


title:
On the State and Importance of Reproducible Experimental Research in
  Parallel Computing

abstract:
  Computer science is also an experimental science. This is particularly the
case for parallel computing, which is in a total state of flux, and where
experiments are necessary to substantiate, complement, and challenge
theoretical modeling and analysis. Here, experimental work is as important as
are advances in theory, that are indeed often driven by the experimental
findings. In parallel computing, scientific contributions presented in research
articles are therefore often based on experimental data, with a substantial
part devoted to presenting and discussing the experimental findings. As in all
of experimental science, experiments must be presented in a way that makes
reproduction by other researchers possible, in principle. Despite appearance to
the contrary, we contend that reproducibility plays a small role, and is
typically not achieved. As can be found, articles often do not have a
sufficiently detailed description of their experiments, and do not make
available the software used to obtain the claimed results. As a consequence,
parallel computational results are most often impossible to reproduce, often
questionable, and therefore of little or no scientific value. We believe that
the description of how to reproduce findings should play an important part in
every serious, experiment-based parallel computing research article. We aim to
initiate a discussion of the reproducibility issue in parallel computing, and
elaborate on the importance of reproducible research for (1) better and sounder
technical/scientific papers, (2) a sounder and more efficient review process
and (3) more effective collective work. This paper expresses our current view
on the subject and should be read as a position statement for discussion and
future work. We do not consider the related (but no less important) issue of
the quality of the experimental design.


title:
Logarithmic Sobolev inequalities and spectral concentration for the
  cubic Schr\"odinger equation

abstract:
  The nonlinear Schr\"odinger equation NLSE(p, \beta), -iu_t=-u_{xx}+\beta |
u|^{p-2} u=0, arises from a Hamiltonian on infinite-dimensional phase space
\Lp^2(\mT). For p\leq 6, Bourgain (Comm. Math. Phys. 166 (1994), 1--26) has
shown that there exists a Gibbs measure \mu^{\beta}_N on balls \Omega_N= {\phi
\in \Lp^2(\mT) : | \phi |^2_{\Lp^2} \leq N} in phase space such that the Cauchy
problem for NLSE(p,\beta) is well posed on the support of \mu^{\beta}_N, and
that \mu^{\beta}_N is invariant under the flow. This paper shows that
\mu^{\beta}_N satisfies a logarithmic Sobolev inequality for the focussing case
\beta <0 and 2\leq p\leq 4 on \Omega_N for all N>0; also \mu^{\beta} satisfies
a restricted LSI for 4\leq p\leq 6 on compact subsets of \Omega_N determined by
H\"older norms. Hence for p=4, the spectral data of the periodic Dirac operator
in \Lp^2(\mT; \mC^2) with random potential \phi subject to \mu^{\beta}_N are
concentrated near to their mean values. The paper concludes with a similar
result for the spectral data of Hill's equation when the potential is random
and subject to the Gibbs measure of KdV.


title: Continuum Contributions to the SDO/AIA Passbands During Solar Flares

abstract:
  Data from the Multiple EUV Grating Spectrograph (MEGS-A) component of the
Extreme Ultraviolet Experiment (EVE) onboard the Solar Dynamics Observatory
(SDO) were used to quantify the contribution of continuum emission to each of
the EUV channels of the Atmospheric Imaging Assembly (AIA), also on SDO, during
an X-class solar flare that occurred on 2011 February 15. Both the pre-flare
subtracted EVE spectra and fits to the associated free-free continuum were
convolved with the AIA response functions of the seven EUV passbands at 10 s
cadence throughout the course of the flare. It was found that 10-25% of the
total emission in the 94A, 131A, 193A, and 335A passbands throughout the main
phase of the flare was due to free-free emission. Reliable measurements could
not be made for the 171A channel, while the continuum contribution to the 304A
channel was negligible due to the presence of the strong He II emission line.
Up to 50% of the emission in the 211A channel was found to be due to free-free
emission around the peak of the flare, while an additional 20% was due to the
recombination continuum of He II. The analysis was extended to a number of M-
and X-class flares and it was found that the level of free-free emission
contributing to the 171A and 211A passbands increased with increasing GOES
class. These results suggest that the amount of continuum emission that
contributes to AIA observations during flares is more significant than that
stated in previous studies which used synthetic, rather than observed, spectra.
These findings highlight the importance of spectroscopic observations carried
out in conjunction with those from imaging instruments so that the data are
interpreted correctly.


title: Polyhedrons and PBIBDs from hyperbolic manifolds

abstract:
  By taking quotients of a certain tiling of hyperbolic plane / space by
certain group actions, we obtain geometric polyhedra / cellulations with
interesting symmetries and incidence structure.


title: Top quark anomalous tensor couplings in the two-Higgs-doublet models

abstract:
  We compute the one loop right and left anomalous tensor couplings ($g_R$ and
$g_L$, respectively) for the top quark, in the aligned two-Higgs-doublet model.
They are the magnetic-like couplings in the most general parameterization of
the $tbW$ vertex. We find that the aligned two-Higgs doublet model, that
includes as particular cases some of the most studied extensions of the Higgs
sector, introduces new electroweak contributions and provides theoretical
predictions that are very sensitive to both new scalar masses and the neutral
scalar mixing angle. For a large area in the parameters space we obtain
significant deviations in both the real and the imaginary parts of the
couplings $g_R$ and $g_L$, compared to the predictions given by the electroweak
sector of the Standard Model. The most important ones are those involving the
imaginary part of the left coupling $g_{L}$ and the real part of the right
coupling $g_R$. The real part of $g_L$ and the imaginary part of $g_R$ also
show an important sensitivity to new physics scenarios. The model can also
account for new CP violation effects via the introduction of complex alignment
parameters that have important consequences on the values for the imaginary
parts of the couplings. The top anomalous tensor couplings will be measured at
the LHC and at future colliders providing a complementary insight on new
physics, independent from the bounds in top decays coming from B physics and $b
\rightarrow s \gamma$.


title: Low Energy Probes of PeV Scale Sfermions

abstract:
  We derive bounds on squark and slepton masses in mini-split supersymmetry
scenario using low energy experiments. In this setup gauginos are at the TeV
scale, while sfermions are heavier by a loop factor. We cover the most
sensitive low energy probes including electric dipole moments (EDMs), meson
oscillations and charged lepton flavor violation (LFV) transitions. A leading
log resummation of the large logs of gluino to sfermion mass ratio is
performed. A sensitivity to PeV squark masses is obtained at present from kaon
mixing measurements. A number of observables, including neutron EDMs, mu->e
transitions and charmed meson mixing, will start probing sfermion masses in the
100 TeV-1000 TeV range with the projected improvements in the experimental
sensitivities. We also discuss the implications of our results for a variety of
models that address the flavor hierarchy of quarks and leptons. We find that
EDM searches will be a robust probe of models in which fermion masses are
generated radiatively, while LFV searches remain sensitive to simple-texture
based flavor models.


title: Connection Matrices and the Definability of Graph Parameters

abstract:
  In this paper we extend and prove in detail the Finite Rank Theorem for
connection matrices of graph parameters definable in Monadic Second Order Logic
with counting (CMSOL) from B. Godlin, T. Kotek and J.A. Makowsky (2008) and
J.A. Makowsky (2009). We demonstrate its vast applicability in simplifying
known and new non-definability results of graph properties and finding new
non-definability results for graph parameters. We also prove a Feferman-Vaught
Theorem for the logic CFOL, First Order Logic with the modular counting
quantifiers.


title: Models with radiative neutrino masses and viable dark matter candidates

abstract:
  We provide a list of particle physics models at the TeV-scale that are
compatible with neutrino masses and dark matter. In these models, the Standard
Model particle content is extended with a small number (\leq 4) of scalar and
fermion fields transforming as singlets, doublets or triplets under SU(2), and
neutrino masses are generated radiatively via 1-loop diagrams. The dark matter
candidates are stabilized by a Z_2 symmetry and are in general mixtures of the
neutral components of such new multiplets. We describe the particle content of
each of these models and determine the conditions under which they are
consistent with current data. We find a total of 35 viable models, most of
which have not been previously studied in the literature. There is a great
potential to test these models at the LHC not only due to the TeV-scale masses
of the new fields but also because about half of the viable models contain
particles with exotic electric charges, which give rise to background-free
signals. Our results should serve as a first step for detailed analysis of
models that can simultaneously account for dark matter and neutrino masses.


title: Brownian Motion of Boomerang Colloidal Particles

abstract:
  We investigate the Brownian motion of boomerang colloidal particles confined
between two glass plates. Our experimental observations show that the mean
displacements are biased towards the center of hydrodynamic stress (CoH), and
that the mean-square displacements exhibit a crossover from short time faster
to long time slower diffusion with the short-time diffusion coefficients
dependent on the points used for tracking. A model based on Langevin theory
elucidates that these behaviors are ascribed to a superposition of two
diffusive modes: the ellipsoidal motion of the CoH and the rotational motion of
the tracking point with respect to the CoH.


title:
Hoodsquare: Modeling and Recommending Neighborhoods in Location-based
  Social Networks

abstract:
  Information garnered from activity on location-based social networks can be
harnessed to characterize urban spaces and organize them into neighborhoods. In
this work, we adopt a data-driven approach to the identification and modeling
of urban neighborhoods using location-based social networks. We represent
geographic points in the city using spatio-temporal information about
Foursquare user check-ins and semantic information about places, with the goal
of developing features to input into a novel neighborhood detection algorithm.
The algorithm first employs a similarity metric that assesses the homogeneity
of a geographic area, and then with a simple mechanism of geographic
navigation, it detects the boundaries of a city's neighborhoods. The models and
algorithms devised are subsequently integrated into a publicly available,
map-based tool named Hoodsquare that allows users to explore activities and
neighborhoods in cities around the world.
  Finally, we evaluate Hoodsquare in the context of a recommendation
application where user profiles are matched to urban neighborhoods. By
comparing with a number of baselines, we demonstrate how Hoodsquare can be used
to accurately predict the home neighborhood of Twitter users. We also show that
we are able to suggest neighborhoods geographically constrained in size, a
desirable property in mobile recommendation scenarios for which geographical
precision is key.


title: The Effects of Dissolved Methane upon Liquid Argon Scintillation Light

abstract:
  In this paper we report on measurements of the effects of dissolved methane
upon argon scintillation light. We monitor the light yield from an alpha source
held 20 cm from a cryogenic photomultiplier tube (PMT) assembly as methane is
injected into a high-purity liquid argon volume. We observe significant
suppression of the scintillation light yield by dissolved methane at the 10
part per billion (ppb) level. By examining the late scintillation light time
constant, we determine that this loss is caused by an absorption process and
also see some evidence of methane-induced scintillation quenching at higher
concentrations (50-100 ppb). Using a second PMT assembly we look for visible
re-emission features from the dissolved methane which have been reported in
gas-phase argon methane mixtures, and we find no evidence of visible
re-emission from liquid-phase argon methane mixtures at concentrations between
10 ppb and 0.1%.


title:
Area inequalities for stable marginally outer trapped surfaces in
  Einstein-Maxwell-dilaton theory

abstract:
  We prove area inequalities for stable marginally outer trapped surfaces in
Einstein-Maxwell-dilaton theory. Our inspiration comes on the one hand from a
corresponding upper bound for the area in terms of the charges obtained
recently by Dain, Jaramillo and Reiris [1] in the pure Einstein-Maxwell case
without symmetries, and on the other hand from Yazadjiev's inequality [2] in
the axially symmetric Einstein-Maxwell-dilaton case. The common issue in these
proofs and in the present one is a functional ${\mathscr W}$ of the matter
fields for which the stability condition readily yields an {\it upper} bound.
On the other hand, the step which crucially depends on whether or not a dilaton
field is present is to obtain a {\it lower} bound for ${\mathscr W}$ as well.
We obtain the latter by first setting up a variational principle for ${\mathscr
W}$ with respect to the dilaton field $\phi$, then by proving existence of a
minimizer $\psi$ as solution of the corresponding Euler-Lagrange equations and
finally by estimating ${\mathscr W}(\psi)$. In the special case that the normal
components of the electric and magnetic fields are proportional we obtain the
area bound $A \ge 8\pi P Q$ in terms of the electric and magnetic charges. In
the generic case our results are less explicit but imply rigorous
`perturbation' results for the above inequality. All our inequalities are
saturated for a 2-parameter family of static, extreme solutions found by
Gibbons [3]. Via the Bekenstein-Hawking relation $A = 4S$ our results give
positive lower bounds for the entropy $S$ which are particularly interesting in
the Einstein-Maxwell-dilaton case.


title:
Precise QCD predictions for the production of a photon pair in
  association with two jets

abstract:
  We compute the cross section for the production of a high-mass photon pair in
association with two hadronic jets to next-to-leading order (NLO) in quantum
chromodynamics (QCD). Our results allow for the first time to reliably predict
the absolute normalisation of this process, and demonstrate that the shape of
important kinematical distributions is modified by higher-order effects. The
perturbative corrections will be an important ingredient to precision studies
of Higgs boson properties from its production in association with two jets.


title:
Giant vortex states in type I superconductors simulated by
  Ginzburg-Landau equations

abstract:
  The quantization of magnetic flux in superconductors is usually seen as
vortices penetrating the sample. While vortices are unstable in bulk type I
superconductors, restricting the superconductor causes a variety of vortex
structures to appear. We present a systematic study of giant vortex states in
type I superconductors obtained by numerically solving the Ginzburg-Landau
equations. The size of the vortices is seen to increase with decreasing film
thickness. In type I superconductors, giant vortices appear at intermediate
thicknesses but they do not form a well-defined vortex lattice. In the thinnest
type I films, singly quantized vortices seem to be stabilized by the geometry
of the sample instead of an increase in the effective Ginzburg-Landau
parameter.


title:
A Convex Framework for Optimal Investment on Disease Awareness in Social
  Networks

abstract:
  We consider the problem of controlling the propagation of an epidemic
outbreak in an arbitrary network of contacts by investing on disease awareness
throughout the network. We model the effect of agent awareness on the dynamics
of an epidemic using the SAIS epidemic model, an extension of the SIS epidemic
model that includes a state of "awareness". This model allows to derive a
condition to control the spread of an epidemic outbreak in terms of the
eigenvalues of a matrix that depends on the network structure and the
parameters of the model. We study the problem of finding the cost-optimal
investment on disease awareness throughout the network when the cost function
presents some realistic properties. We propose a convex framework to find
cost-optimal allocation of resources. We validate our results with numerical
simulations in a real online social network.


title:
The role of blood circulatory system in thermal regulation of animals
  explained by entropy production analysis

abstract:
  A novel model of thermal regulation of homoeothermic animals has been
implemented. The model is based on a non-equilibrium thermodynamic approach
which introduces entropy balance and the rate of entropy generation as a
formulation of The Second Law. The model explains linear correlation between an
animals skin and environment temperatures using the first principles and
demonstrates the role of blood circulation in the thermoregulation of
homoeothermic animals.


title:
Constraints on the Skyrme Equations of State from Properties of Doubly
  Magic Nuclei

abstract:
  I use properties of doubly-magic nuclei to constrain nuclear matter and
neutron matter equations of state. I conclude that the data determined the
value of the neutron equation of state and the symmetry energy near a density
of $\rho_{on}$ = 0.10 nucleons/fm$^{3}$. The slope at that point is constrained
by the value of the neutron skin.


title: On Sparsification for Computing Treewidth

abstract:
  We investigate whether an n-vertex instance (G,k) of Treewidth, asking
whether the graph G has treewidth at most k, can efficiently be made sparse
without changing its answer. By giving a special form of OR-cross-composition,
we prove that this is unlikely: if there is an e > 0 and a polynomial-time
algorithm that reduces n-vertex Treewidth instances to equivalent instances, of
an arbitrary problem, with O(n^{2-e}) bits, then NP is in coNP/poly and the
polynomial hierarchy collapses to its third level.
  Our sparsification lower bound has implications for structural
parameterizations of Treewidth: parameterizations by measures that do not
exceed the vertex count, cannot have kernels with O(k^{2-e}) bits for any e >
0, unless NP is in coNP/poly. Motivated by the question of determining the
optimal kernel size for Treewidth parameterized by vertex cover, we improve the
O(k^3)-vertex kernel from Bodlaender et al. (STACS 2011) to a kernel with
O(k^2) vertices. Our improved kernel is based on a novel form of
treewidth-invariant set. We use the q-expansion lemma of Fomin et al. (STACS
2011) to find such sets efficiently in graphs whose vertex count is
superquadratic in their vertex cover number.


title: The Nuclear Pairing Gap -- How Low Can It Go?

abstract:
  The pairing gap for $^{53}$Ca obtained from new experimental data on the
masses of $^{52-54}$Ca has the smallest value yet observed. This is explained
in the framework of the nuclear shell model with schematic and realistic
Hamiltonians as being due to shell gaps around the low-$ j $ orbital $ 1p_{1/2}
$. Minima in the pairing gaps for all nuclei are shown and discussed


title: Chemical energy in an introductory physics course for the life sciences

abstract:
  Energy is a complex idea that cuts across scientific disciplines. For life
science students, an approach to energy that incorporates chemical bonds and
chemical reactions is better equipped to meet the needs of life sciences
students than a traditional introductory physics approach that focuses
primarily on mechanical energy. We present a curricular sequence, or thread,
designed to build up students' understanding of chemical energy in an
introductory physics course for the life sciences. This thread is designed to
connect ideas about energy from physics, biology, and chemistry. We describe
the kinds of connections among energetic concepts that we intended to develop
to build interdisciplinary coherence, and present some examples of curriculum
materials and student data that illustrate our approach.


title: Kinetic properties in inhomogeneous self-aware media

abstract:
  The new framework for finance is proposed. This framework based on three
known approaches in econophysics. Assumptions of the framework are the
following: 1. For the majority of situations market follows non-arbitrage
condition. 2. For the small number of situations market influenced by the
actions of big firms. 3. If actions of big players lead to the arbitrage
opportunity, small players could self-organize to take advantage of this
opportunity. The framework is an attempt to combine approaches of Bouchaud,
Gabaix, Sornette, Stanley and coauthors. Suggested framework is applied for the
analysis of market impact models, behavior of big players, self-organization of
market firm and volatility description.


title: A generalisation of core partitions

abstract:
  Suppose $s$ and $t$ are coprime natural numbers. A theorem of Olsson says
that the $t$-core of an $s$-core partition is again an $s$-core. We generalise
this theorem, showing that the $s$-weight of the $t$-core of a partition
$\lambda$ is at most the $s$-weight of $\lambda$. Then we consider the set
$\mathcal C_{s:t}$ of partitions for which equality holds, which we call
$[s{:}t]$-cores; this set has interesting structure, and we expect that it will
be the subject of future study. We show that the set of $[s{:}t]$-cores is a
union of finitely many orbits for an action of a Coxeter group of type $\tilde
A_{s-1}\times\tilde A_{t-1}$ on the set of partitions. We also consider the
problem of constructing an $[s{:}t]$-core with specified $s$-core and $t$-core.


title:
Tight Lagrangian homology spheres in compact homogeneous K\"ahler
  manifolds

abstract:
  For any irreducible compact homogeneous K\"ahler manifold, we classify the
compact tight Lagrangian submanifolds which have the Z_2-homology of a sphere.


title:
THz generation by optical Cherenkov emission from ionizing two-color
  laser pulses

abstract:
  Two-color photoionization produces a cycle-averaged current driving
broadband, conically emitted THz radiation. We investigate, through simulation,
the processes determining the angle of conical emission. We find that the
emission angle is determined by an optical Cherenkov effect, where the front
velocity of the current source is faster than the THz phase velocity.


title: Emergent spin

abstract:
  Quantum mechanics and relativity in the continuum imply the well known
spin-statistics connection. However for particles hopping on a lattice, there
is no such constraint. If a lattice model yields a relativistic field theory in
a continuum limit, this constraint must "emerge" for physical excitations. We
discuss a few models where a spin-less fermion hopping on a lattice gives
excitations which satisfy the continuum Dirac equation. This includes such well
known systems such as graphene and staggered fermions.