title:
Spontaneous synchronization and quantum correlation dynamics of open
  spin systems

abstract:
  We discuss the emergence of spontaneous synchronization for an open spin-pair
system interacting only via a common environment. Under suitable conditions,
and even in the presence of detuning between the natural precession frequencies
of the two spins, they are shown to reach a long-lasting transient behavior
where they oscillate in phase. We explore the connection between the emergence
of such a behavior and the establishment of robust quantum correlations between
the two spins, analyzing differences between dissipative and dephasing effects.


title: On the Minimum Dark Matter Mass Testable by Neutrinos from the Sun

abstract:
  We discuss a limitation on extracting bounds on the scattering cross section
of dark matter with nucleons, using neutrinos from the Sun. If the dark matter
particle is sufficiently light (less than about 4 GeV), the effect of
evaporation is not negligible and the capture process goes in equilibrium with
the evaporation. In this regime, the flux of solar neutrinos of dark matter
origin becomes independent of the scattering cross section and therefore no
constraint can be placed on it. We find the minimum values of dark matter
masses for which the scattering cross section on nucleons can be probed using
neutrinos from the Sun. We also provide simple and accurate fitting functions
for all the relevant processes of GeV-scale dark matter in the Sun.


title: Quasioptimality of maximum-volume cross interpolation of tensors

abstract:
  We consider a cross interpolation of high-dimensional arrays in the tensor
train format. We prove that the maximum-volume choice of the interpolation sets
provides the quasioptimal interpolation accuracy, that differs from the best
possible accuracy by the factor which does not grow exponentially with
dimension. For nested interpolation sets we prove the interpolation property
and propose greedy cross interpolation algorithms. We justify the theoretical
results and test the speed and accuracy of the proposed algorithm with
convincing numerical experiments.


title: A copositive formulation for the stability number of infinite graphs

abstract:
  In the last decade, copositive formulations have been proposed for a variety
of combinatorial optimization problems, for example the stability number
(independence number). In this paper, we generalize this approach to infinite
graphs and show that the stability number of an infinite graph is the optimal
solution of some infinite-dimensional copositive program. For this we develop a
duality theory between the primal convex cone of copositive kernels and the
dual convex cone of completely positive measures. We determine the extreme rays
of the latter cone, and we illustrate this theory with the help of the kissing
number problem.


title:
Longitudinal Seebeck coefficient of the charge ordered layered crystals
  in a strong quantizing magnetic field

abstract:
  The longitudinal Seebeck coefficient of the charge-ordered layered crystals
in a strong quantizing magnetic field normal to layers plane has been
determined. The conditions whereby charge ordering parameter and chemical
potential are oscillating functions of magnetic field induction are considered.
The longitudinal Seebeck coefficient has been calculated for two models of
relaxation time:i)constant relaxation time and ii)relaxation time proportional
to the longitudinal velocity. It has been shown that in a quasi-classical
region of magnetic fields for the case of relaxation time proportional to the
longitudinal velocity Seebeck coefficient is less than for the case of constant
relaxation time. In this region for selected problem parameters it does not
exceed 4.37mu\V/K.In the strong quantizing magnetic fields for both models of
the relaxation time the longitudinal Seebeck coefficient is virtually the same.
For selected problem parameters its maximal modulus is 2033\muV/K. At the same
time, in the disordered layered crystals,in a quasi-classical region,the
Seebeck coefficient is approximately one order of magnitude less than for the
charge ordered crystals. In the strong magnetic fields,the Seebeck coefficient
for the disordered layered crystals is factor of 7 or 9 less than for the
charge ordered crystals. However,in super strong magnetic fields,under current
carriers concentration in the only filled Landau sub-band,for both models of of
the relaxation time the modulus of the Seebeck coefficient tends to zero
according to asymptotic law \alpha_{zz}\proptoB^{-2}.


title:
On the group generated by the round functions of translation based
  ciphers over arbitrary finite fields

abstract:
  We define a translation based cipher over an arbitrary finite field, and
study the permutation group generated by the round functions of such a cipher.
We show that under certain cryptographic assumptions this group is primitive.
Moreover, a minor strengthening of our assumptions allows us to prove that such
a group is the symmetric or the alternating group; this improves upon a
previous result for the case of characteristic two.


title: Tumbling of small axisymmetric particles in random and turbulent flows

abstract:
  We analyse the tumbling of small non-spherical, axisymmetric particles in
random and turbulent flows. We compute the orientational dynamics in terms of a
perturbation expansion in the Kubo number, and obtain the tumbling rate in
terms of Lagrangian correlation functions. These capture preferential sampling
of the fluid gradients which in turn can give rise to differences in the
tumbling rates of disks and rods. We show that this is a weak effect in
Gaussian random flows. But in turbulent flows persistent regions of high
vorticity cause disks to tumble much faster than rods, as observed in direct
numerical simulations [Parsa et al., Phys. Rev. Lett. 109 (2012) 134501]. For
larger particles (at finite Stokes numbers), rotational and translational
inertia affects the tumbling rate and the angle at which particles collide, due
to the formation of rotational caustics.


title:
CANDELS Multiwavelength catalogs: Source Identification and Photometry
  in the CANDELS UKIDSS Ultra-Deep Survey Field

abstract:
  We present the multiwavelength - ultraviolet to mid-infrared - catalog of the
UKIDSS Ultra-Deep Survey (UDS) field observed as part of the Cosmic Assembly
Near-infrared Deep Extragalactic Legacy Survey (CANDELS). Based on publicly
available data, the catalog includes: the CANDELS data from the Hubble Space
Telescope (near-infrared WFC3 F125W and F160W data and visible ACS F606W and
F814W data), u-band data from CFHT/Megacam, B, V, Rc, i' and z' band data from
Subaru/Suprime-Cam, Y and Ks band data from VLT/HAWK-I, J, H and K bands data
from UKIDSS (Data Release 8), and Spitzer/IRAC data (3.6, 4.5 from SEDS, 5.8
and 8.0um from SpUDS). The present catalog is F160W-selected and contains 35932
sources over an area of 201.7 square arcmin and includes radio and X-ray
detected sources and spectroscopic redshifts available for 210 sources.


title:
Strong Products of Hypergraphs: Unique Prime Factorization Theorems and
  Algorithms

abstract:
  It is well-known that all finite connected graphs have a unique prime factor
decomposition (PFD) with respect to the strong graph product which can be
computed in polynomial time. Essential for the PFD computation is the
construction of the so-called Cartesian skeleton of the graphs under
investigation.
  In this contribution, we show that every connected thin hypergraph H has a
unique prime factorization with respect to the normal and strong (hypergraph)
product. Both products coincide with the usual strong graph product whenever H
is a graph. We introduce the notion of the Cartesian skeleton of hypergraphs as
a natural generalization of the Cartesian skeleton of graphs and prove that it
is uniquely defined for thin hypergraphs. Moreover, we show that the Cartesian
skeleton of hypergraphs can be determined in O(|E|^2) time and that the PFD can
be computed in O(|V|^2|E|) time, for hypergraphs H = (V,E) with bounded degree
and bounded rank.


title:
Efficient Implementation of the Barnes-Hut Octree Algorithm for Monte
  Carlo Simulations of Charged Systems

abstract:
  Computer simulation with Monte Carlo is an important tool to investigate the
function and equilibrium properties of many systems with biological and soft
matter materials solvable in solvents. The appropriate treatment of long-range
electrostatic interaction is essential for these charged systems, but remains a
challenging problem for large-scale simulations. We have developed an efficient
Barnes-Hut treecode algorithm for electrostatic evaluation in Monte Carlo
simulations of Coulomb many-body systems. The algorithm is based on a
divide-and-conquer strategy and fast update of the octree data structure in
each trial move through a local adjustment procedure. We test the accuracy of
the tree algorithm, and use it to perform computer simulations of electric
double layer near a spherical interface. It has been shown that the
computational cost of the Monte Carlo method with treecode acceleration scales
as $\log N$ in each move. For a typical system with ten thousand particles, by
using the new algorithm, the speed has been improved by two orders of magnitude
from the direct summation.


title:
Peierls-type structural phase transition in a crystal induced by
  magnetic breakdown

abstract:
  We predict a new type of phase transition in a quasi-two dimensional system
of electrons at high magnetic fields, namely the stabilization of a density
wave which transforms a two dimensional open Fermi surface into a periodic
chain of large pockets with small distances between them. The quantum tunneling
of electrons between the neighboring closed orbits enveloping these pockets
transforms the electron spectrum into a set of extremely narrow energy bands
and gaps which decreases the total electron energy, thus leading to a magnetic
breakdown induced density wave (MBIDW) ground state. We show that this DW
instability has some qualitatively different properties in comparison to
analogous DW instabilities of Peierls type. E. g. the critical temperature of
the MBIDW phase transition arises and disappears in a peculiar way with a
change of the inverse magnetic field.


title: Notes on the Krupa-Zawisza Ultrapower of Self-Adjoint Operators

abstract:
  It is known that there is a difficulty in constructing the ultrapower of
unbounded operators. Krupa and Zawisza gave a rigorous definition of the
ultrapower A^{omega} of a selfadjoint operator A. In this note, we give
alternative description of A^{omega} and the Hilbert space H(A) on which
A^{omega} is densely defined, which provides a criterion to determine to which
representing sequence (\xi_n)n of a given vector \xi in dom(A^{omega}) has the
property that A^{omega}\xi = (A\xi_n)_{omega} holds.


title:
Dynamical tunneling of a Bose-Einstein condensate in periodically driven
  systems

abstract:
  We report measurements of dynamical tunneling rates of a Bose-Einstein
condensate across a barrier in classical phase space. The atoms are initially
prepared in quantum states that extend over a classically regular island
region. We focus on the specific system of quantum accelerator modes of the
kicked rotor in the presence of gravity. Our experimental data is supported by
numerical simulations taking into account imperfections mainly from spontaneous
emission. Furthermore, we predict experimentally accessible parameter ranges
over which direct tunneling could be readily observed if spontaneous emission
was further suppressed. Altogether, we provide a proof-of-principle for the
experimental accessibility of dynamical tunneling rates in periodically driven
systems.


title: Range-Renewal Processes: SLLN, Power Law and Beyonds

abstract:
  Given $n$ samples of a regular discrete distribution $\pi$, we prove in this
article first a serial of SLLNs results (of Dvoretzky and Erd\"{o}s' type)
which implies a typical power law when $\pi$ is heavy-tailed. Constructing a
(random) graph from the ordered $n$ samples, we can establish other laws for
the degree-distribution of the graph. The phenomena of small world is also
discussed.


title:
Effective fluctuation theorems for electron transport in a double
  quantum dot coupled to a quantum point contact

abstract:
  A theoretical study is reported of electron transport at finite temperature
in a double quantum dot (DQD) capacitively coupled to a quantum point contact
(QPC). Starting from a Hamiltonian model, a master equation is obtained for the
stochastic process taking place in the DQD while the QPC is at or away from
equilibrium, allowing us to study the backaction of the QPC onto the DQD. The
QPC is treated non-perturbatively in our analysis. Effective fluctuation
theorems are established for the full counting statistics of the DQD current
under different limiting conditions. These fluctuation theorems hold with
respect to an effective affinity characterizing the nonequilibrium environment
of the DQD and differing from the applied voltage if the QPC is out of
equilibrium. The effective affinity may even change its sign if the Coulomb
drag of the QPC reverses the DQD current. The thermodynamic implications of the
effective fluctuation theorems are discussed.


title: Skew Hadamard Difference Sets from Dickson Polynomials of Order 7

abstract:
  Skew Hadamard difference sets are an interesting topic of study for over
seventy years. For a long time, it had been conjectured the classical Paley
difference sets (the set of nonzero quadratic residues in $\mathbb{F}_q$ where
$q \equiv 3 \bmod{4}$) were the only example in abelian groups. In 2006, the
first author and Yuan disproved this conjecture by showing that the image set
of $\mathcal{D}_5(x^2,u)$ is a new skew Hadamard difference set in
$(\mathbb{F}_{3^m},+)$ with $m$ odd, where $\mathcal{D}_n(x,u)$ denotes the
first kind of Dickson polynomials of order $n$ and $u \in \mathbb{F}_q^*$. The
key observation in the proof is that $\mathcal{D}_5(x^2,u)$ is a planar
function from $\mathbb{F}_{3^m}$ to $\mathbb{F}_{3^m}$ for $m$ odd. Since then
a few families of new skew Hadamard difference sets have been discovered. In
this paper, we prove that for all $u \in \mathbb{F}_{3^m}^*$, the set $D_u :=
\{\mathcal{D}_7(x^2,u) : x \in \mathbb{F}_{3^m}^* \}$ is a skew Hadamard
difference set in $(\mathbb{F}_{3^m}, +)$, where $m$ is odd and $m \not \equiv
0 \pmod{3}$. The proof is more complicated and different from that of Ding-Yuan
skew Hadamard difference sets since $\mathcal{D}_7(x^2,u)$ is not planar in
$\mathbb{F}_{3^m}$. Furthermore, we show that such skew Hadamard difference
sets are inequivalent to all existing ones for $m = 5, 7$ by comparing the
triple intersection numbers.


title:
Probing atom-surface interactions by diffraction of Bose-Einstein
  condensates

abstract:
  In this article we analyze the Casimir-Polder interaction of atoms with a
solid grating and an additional repulsive interaction between the atoms and the
grating in the presence of an external laser source. The combined potential
landscape above the solid body is probed locally by diffraction of
Bose-Einstein condensates. Measured diffraction efficiencies reveal information
about the shape of the Casimir-Polder interaction and allow us to discern
between models based on a pairwise-summation (Hamaker) approach and Lifshitz
theory.


title: On generalized Hilbert-Kunz function and multiplicity

abstract:
  Let $(R,\mathfrak m)$ be a local ring of characteristic $p>0$ and $M$ a
finitely generated $R$-module. In this note we consider the limit: $\lim_{n\to
\infty} \frac{\ell(H^0_{\mathfrak m}(F^n(M)))}{p^{n\dim R}} $ where $F(-)$ is
the Peskine-Szpiro functor. A consequence of our main results shows that the
limit always exists when $R$ is excellent and has isolated singularity.
Furthermore, if $R$ is a complete intersection, then the limit is 0 if and only
if the projective dimension of $M$ is less than the Krull dimension of $R$. We
exploit this fact to give a quick proof that if $R$ is a complete intersection
of dimension $3$, then the Picard group of the punctured spectrum of $R$ is
torsion-free. Our results work quite generally for other homological functors
and can be used to prove that certain limits recently studied by Brenner exist
over projective varieties.


title:
Two-dimensional intra-band solitons in lattice potentials with local
  defects and self-focusing nonlinearity

abstract:
  It is commonly known that stable bright solitons in periodic potentials,
which represent gratings in photonics/plasmonics, or optical lattices in
quantum gases, exist either in the spectral semi-infinite gap (SIG) or in
finite bandgaps. Using numerical methods, we demonstrate that, under the action
of the cubic self-focusing nonlinearity, defects in the form of "holes" in
two-dimensional (2D) lattices support continuous families of 2D solitons
\textit{embedded} into the first two Bloch bands of the respective linear
spectrum, where solitons normally do not exist. The two families of the
\textit{embedded defect solitons} (EDSs) are found to be continuously linked by
the branch of \textit{gap defect solitons} (GDSs) populating the first finite
bandgap. Further, the EDS branch traversing the first band links the GDS family
with the branch of regular defect-supported solitons populating the SIG. Thus,
we construct a continuous chain of regular, embedded, and gap-mode solitons
("superfamily") threading the entire bandgap structure considered here. The
EDSs are stable in the first Bloch band, and partly stable in the second. They
exist with the norm exceeding a minimum value, hence they do not originate from
linear defect modes. Further, we demonstrate that double, triple and quadruple
lattice defects support stable dipole-mode solitons and vortices.


title: Parity violating quantum kinetic theory in (2+1)-dimensions

abstract:
  We study the kinetic theory for a (2+1)-dimensional fermionic system with
special emphasis on the parity violating properties associated with the fermion
mass. The Wigner function approach is used to derive hydrodynamical transport
coefficients to the first spatial derivative order. As a first attempt, the
collisions between fermions are neglected. The resulting system is
dissipationless. The parity violating Hall electric conductivity has the same
temperature and chemical potential dependence as the quantum field theory
result at one-loop. Vorticity dependent transport properties, which were not
considered before, also emerge naturally in this approach.


title: Entropic measures of individual mobility patterns

abstract:
  Understanding human mobility from a microscopic point of view may represent a
fundamental breakthrough for the development of a statistical physics for
cognitive systems and it can shed light on the applicability of macroscopic
statistical laws for social systems. Even if the complexity of individual
behaviors prevents a true microscopic approach, the introduction of mesoscopic
models allows the study of the dynamical properties for the non-stationary
states of the considered system. We propose to compute various entropy measures
of the individual mobility patterns obtained from GPS data that record the
movements of private vehicles in the Florence district, in order to point out
new features of human mobility related to the use of time and space and to
define the dynamical properties of a stochastic model that could generate
similar patterns. Moreover, we can relate the predictability properties of
human mobility to the distribution of time passed between two successive trips.
Our analysis suggests the existence of a hierarchical structure in the mobility
patterns which divides the performed activities into three different
categories, according to the time cost, with different information contents. We
show that a Markov process defined by using the individual mobility network is
not able to reproduce this hierarchy, which seems the consequence of different
strategies in the activity choice. Our results could contribute to the
development of governance policies for a sustainable mobility in modern cities.


title:
Integration of on-chip field-effect transistor switches with dopantless
  Si/SiGe quantum dots for high-throughput testing

abstract:
  Measurement of multiple quantum devices on a single chip increases
characterization throughput and enables testing of device repeatability,
process yield, and systematic variations in device design. We present a method
that uses on-chip field-effect transistor switches to enable multiplexed
cryogenic measurements of double quantum dot Si/SiGe devices. Multiplexing
makes it feasible to characterize a number of devices that scales exponentially
with the number of external wires, a key capability given the significant
constraints on cryostat wiring currently in common use. We use this approach to
characterize three nominally identical quantum-point contact channels, enabling
comparison of their threshold voltages for accumulation and their pinch-off
voltages during a single cool-down of a dilution refrigerator.


title:
Locating Multiple Multi-scale Electromagnetic Scatterers by A Single
  Far-field Measurement

abstract:
  Two inverse scattering schemes were recently developed in
\cite{LiLiuShangSun} for locating multiple electromagnetic (EM) scatterers,
respectively, of small size and regular size compared to the detecting EM
wavelength. Both schemes make use of a single far-field measurement. The scheme
of locating regular-size scatterers requires the {\it a priori} knowledge of
the possible shapes, orientations and sizes of the underlying scatterer
components. In this paper, we extend that imaging scheme to a much more
practical setting by relaxing the requirement on the orientations and sizes. We
also develop an imaging scheme of locating multiple multi-scale EM scatterers,
which may include at the same time, both components of regular size and small
size. For the second scheme, a novel local re-sampling technique is developed.
Furthermore, more robust and accurate reconstruction can be achieved for the
second scheme if an additional far-field measurement is used. Rigorous
mathematical justifications are provided and numerical results are presented to
demonstrate the effectiveness and the promising features of the proposed
imaging schemes.


title: On the local rigidity of Einstein manifolds with convex boundary

abstract:
  Let (M, g) be a compact Einstein manifold with non-empty boundary. We prove
that Killing fields at the boundary extend to Killing fields of any (M, g)
provided the boundary is weakly convex and a simple condition on the
fundamental group holds. This gives a new proof of the classical infinitesimal
rigidity of convex surfaces in Euclidean space and generalizes the result to
Einstein metrics of any dimension.


title:
A Dataflow Language for Decentralised Orchestration of Web Service
  Workflows

abstract:
  Orchestrating centralised service-oriented workflows presents significant
scalability challenges that include: the consumption of network bandwidth,
degradation of performance, and single points of failure. This paper presents a
high-level dataflow specification language that attempts to address these
scalability challenges. This language provides simple abstractions for
orchestrating large-scale web service workflows, and separates between the
workflow logic and its execution. It is based on a data-driven model that
permits parallelism to improve the workflow performance. We provide a
decentralised architecture that allows the computation logic to be moved
"closer" to services involved in the workflow. This is achieved through
partitioning the workflow specification into smaller fragments that may be sent
to remote orchestration services for execution. The orchestration services rely
on proxies that exploit connectivity to services in the workflow. These proxies
perform service invocations and compositions on behalf of the orchestration
services, and carry out data collection, retrieval, and mediation tasks. The
evaluation of our architecture implementation concludes that our decentralised
approach reduces the execution time of workflows, and scales accordingly with
the increasing size of data sets.


title: The Persistence of Uphill Anomalous Transport in Inhomogeneous Media

abstract:
  For systems out of equilibrium and subjected to a static bias force it can
often be expected that particle transport will usually follow the direction of
this bias. However, counter-examples exist where particles exhibit uphill
motion (known as absolute negative mobility - ANM), particularly in the case of
coupled particles. Examples in single particle deterministic systems are less
common. Recently, in one such example, uphill motion was shown to occur for an
inertial driven and damped particle in a spatially symmetric periodic
potential. The source of this anomalous transport was a combination of two
periodic driving signals which together are asymmetric under time reversal. In
this paper we investigate the phenomena of ANM for a deterministic particle
evolving in a periodic and symmetric potential subjected to an external
unbiased periodic driving and nonuniform space- dependent damping. It will be
shown that this system exhibits a complicated response behaviour as certain
control parameters are varied, most notably being, enhanced parameter regimes
exhibiting ANM as the static bias force is increased. Moreover, the solutions
exhibiting ANM are shown to be, at least over intermediate time periods,
superdiffusive, in contrast to the solutions that follow the bias where the
diffusion is normal.


title: An Architecture for Decentralised Orchestration of Web Service Workflows

abstract:
  Service-oriented workflows are typically executed using a centralised
orchestration approach that presents significant scalability challenges. These
challenges include the consumption of network bandwidth, degradation of
performance, and single-points of failure. We provide a decentralised
orchestration architecture that attempts to address these challenges. Our
architecture adopts a design model that permits the computation to be moved
"closer" to services in a workflow. This is achieved by partitioning workflows
specified using our simple dataflow language into smaller fragments, which may
be sent to remote locations for execution.


title:
A weak Gordon type condition for absence of eigenvalues of
  one-dimensional Schr\"odinger operators

abstract:
  We study one-dimensional Schr\"odinger operators with complex measures as
potentials and present an improved criterion for absence of eigenvalues which
involves a weak local periodicity condition. The criterion leads to sharp
quantitative bounds on the eigenvalues. We apply our result to quasiperiodic
measures as potentials.


title: A numerical study of stretched smectic-A elastomer sheets

abstract:
  We present a numerical study of stretching monodomain smectic-A elastomer
sheets, computed using the finite element method. When stretched parallel to
the layer normal the microscopic layers in smectic elastomers are unstable to a
transition to a buckled state. We account for the layer buckling by replacing
the microscopic energy with a coarse grained effective free energy that
accounts for the fine scale deformation of the layers. We augment this model
with a term to describe the energy of deforming buckled layers, which is
necessary to reproduce the experimentally observed Poisson's ratios
post-buckling. We examine the spatial distribution of the microstructure phases
for various stretching angles relative to the layer normal, and for different
length-to-width aspect ratios. When stretching parallel to the layer normal the
majority of the sample forms a bi-directionally buckled microstructure, except
at the clamps where uni-directional microstructure is predicted. When
stretching at small inclinations to the layer normal the phase of the sample is
sensitive to the aspect ratio of the sample, with the bi-directionally buckled
phase persistent to large angles only for small aspect ratios. We relate these
theoretical results to experiments on smectic-A elastomers.


title: Type Ia Supernovae inside Planetary Nebulae: Shaping by Jets

abstract:
  Using 3D numerical hydrodynamical simulations we show that jets launched
prior to type Ia supernova (SN Ia) explosion in the core-degenerate scenario
can account for the appearance of two opposite lobes ('Ears') along the
symmetry axis of the SN remnant (SNR). In the double-degenerate and
core-degenerate scenarios the merger of the two degenerate compact objects is
very likely to lead to the formation of an accretion disk, that might launch
two opposite jets. In the CD scenario these jets interact with the envelope
ejected during the preceding common envelope phase. If explosion occurs shortly
after the merger process, the exploding gas and the jets will collide with the
ejected nebula, leading to SNR with axisymmetric components including 'Ears'.
We also explore the possibility that the jets are launched by the companion
white dwarf prior to its merger with the core. This last process is similar to
the one where jets are launched in some pre-planetary nebulae. The SNR 'Ears'
in this case are formed by a spherical SN Ia explosion inside an elliptical
planetary nebula-like object. We compare our numerical results with two SNRs -
Kepler and G299.2-2.9.


title: No-Scale F-SU(5) in the Light of LHC, Planck and XENON

abstract:
  We take stock of the No-Scale F-SU(5) model's experimental status and
prospects in the light of results from LHC, Planck, and XENON100. Given that no
conclusive evidence for light Supersymmetry (SUSY) has emerged from the 7, 8
TeV collider searches, the present work is focused on exploring and clarifying
the precise nature of the high-mass cutoff enforced on this model at the point
where the stau and neutralino mass degeneracy becomes so tight that cold dark
matter relic density observations cannot be satisfied. This hard upper boundary
on the model's mass scale constitutes a top-down theoretical mandate for a
comparatively light (and testable) SUSY spectrum which does not excessively
stress natural resolution of the gauge hierarchy problem. The overlap between
the resulting model boundaries and the expected sensitivities of the future 14
TeV LHC and XENON 1-Ton direct detection SUSY / dark matter experiments is
described.


title:
Energetics of discrete selectivity bands and mutation-induced
  transitions in the calcium-sodium ion channels family

abstract:
  We use Brownian dynamics simulations to study the permeation properties of a
generic electrostatic model of a biological ion channel as a function of the
fixed charge $Q_f$ at its selectivity filter. We reconcile the
recently-discovered discrete calcium conduction bands M0 ($Q_f$=1e), M1 (3e),
M2 (5e) with the set of sodium conduction bands L0 (0.5-0.7e), L1 (1.5-2e)
thereby obtaining a completed pattern of conduction and selectivity bands v
$Q_f$ for the sodium-calcium channels family. An increase of $Q_f$ leads to an
increase of calcium selectivity: L0 (sodium selective, non-blocking channel) ->
M0 (non-selective channel) -> L1 (sodium selective channel with divalent block)
-> M1 (calcium selective channel exhibiting the anomalous mole fraction
effect). We create a consistent identification scheme where the L0 band is
identified with the eukaryotic (DEKA) sodium channel, and L1/L2 (speculatively)
with the bacterial NaChBac channel. The scheme created is able to account for
the experimentally observed mutation-induced transformations between
non-selective channels, sodium-selective channels, and calcium-selective
channels, which we interpret as transitions between different rows of the
identification table. By considering the potential energy changes during
permeation, we show explicitly that the multi-ion conduction bands of calcium
and sodium channels arise as the result of resonant barrier-less conduction.
Our results confirm the crucial influence of electrostatic interactions on
conduction and on the Ca/Na valence selectivity of calcium and sodium ion
channels. The model and results could be also applicable to biomimetic
nanopores with charged walls.


title: Angle-Resolved Photoemission Spectroscopy Study of BaCo2As2

abstract:
  We use angle-resolved photoemission spectroscopy and full-potential
linearized augmented-plane-wave (FP-LAPW) calculations to study the electronic
structure of BaCo2As2. The Fermi surface (FS) maps and the corresponding band
dispersion data (at 90 K and 200 K) reveal a small electron pocket at the
center and a large electron pocket at the corner of the Brillouin zone.
Therefore the nesting between electron and hole FS pockets is absent in this
compound, in contrast to the parent compounds of FeAs-based high-T_c
superconductors. The electronic structure at about 500 meV binding energy is
very similar to features at the chemical potential in BaFe2As2. This indicates
that complete substitution of Co for Fe causes a nearly rigid shift in the
Fermi energy by adding two electrons per formula unit without significant
changes in the band dispersions. The experimental FS topology as well as band
dispersion data are in reasonable agreement with the FP-LAPW calculations.


title:
Marichev-Saigo-Maeda fractional integration operators of generalized
  Bessel functions

abstract:
  Two integral operator involving the Appell's functions, or Horn's function in
the kernel are considered. Composition of such functions with generalized
Bessel functions of the first kind are expressed in term of generalized Wright
function and generalized hypergeometric series. Many special cases, including
cosine and sine function are also discussed.


title: $L^4$-norms of Hecke newforms of large level

abstract:
  We prove a new upper bound for the $L^4$-norm of a holomorphic Hecke newform
of large fixed weight and prime level $q\to \infty$. This is achieved by
proving a sharp mean value estimate for a related $L$-function on GL(6)


title: Optical and near-infrared observations of SN 2011dh - The first 100 days

abstract:
  We present optical and near-infrared (NIR) photometry and spectroscopy of the
Type IIb supernova (SN) 2011dh for the first 100 days. We complement our
extensive dataset with SWIFT ultra-violet (UV) and Spitzer mid-infrared (MIR)
data to build a UV to MIR bolometric lightcurve using both photometric and
spectroscopic data. Hydrodynamical modelling of the SN based on this bolometric
lightcurve have been presented in Bersten (2012). We find that the absorption
minimum for the hydrogen lines is never seen below ~11000 km/s but approaches
this value as the lines get weaker. This suggests that the interface between
the helium core and hydrogen rich envelope is located near this velocity in
agreement with the Bersten et al. (2012) He4R270 ejecta model. Spectral
modelling of the hydrogen lines using this ejecta model supports the conclusion
and we find a hydrogen mass of 0.01-0.04 solar masses to be consistent with the
observed spectral evolution. We estimate that the photosphere reaches the
helium core at 5-7 days whereas the helium lines appear between ~10 and ~15
days, close to the photosphere and then move outward in velocity until ~40
days. This suggests that increasing non-thermal excitation due to decreasing
optical depth for the gamma-rays is driving the early evolution of these lines.
We also provide and discuss pre- and post-explosion observations of the SN site
which shows a reduction by 75 percent in flux at the position of the yellow
supergiant coincident with SN 2011dh. The B, V and r band decline rates of
0.0073, 0.0090 and 0.0053 mag/day respectively are consistent with the
remaining flux being emitted by the SN. Hence we find that the star was indeed
the progenitor of SN 2011dh as previously suggested by Maund et al. (2011) and
which is also consistent with the results from the hydrodynamical modelling.


title: Graph Theoretic Analysis of Knowledge Networks

abstract:
  Purpose of our work is to obtain a basic understanding and comparison of the
performance and structure of real Knowledge Networks, to identify strengths and
weaknesses and to highlight guidelines for improvements. We selected 18
Knowledge Networks from the service sector and 12 networks from the production
sector and estimated their Performance and Structure in terms of 19 indices
from graph theory. Highlights from our work include: 1) As most networks are
unilaterally structured, the direction of knowledge transfer should be taken
into account as illustrated in the analysis of clubs and entropy, 2) The
stability of most Knowledge Networks is questionable, 3) Few networks are
effective in sharing information, while most Knowledge Networks cannot benefit
from the network effect, have rather limited capability for coordination,
information propagation and synchronization and are not able to integrate Tacit
knowledge, 4) Few networks have large cliques which have to be managed with
caution as their role may be highly constructive or destructive, 5) While
agents with rich connections form clubs, as in most social networks, the poor
club effect is not negligible when we take into account the link direction, 6)
The directed link analysis of entropy reveals the low
complexity-diversification of the Knowledge Networks. In fact the only high
entropy network found, has been improved by Knowledge Management Professionals.
As most Knowledge Networks underperform, there is plenty of room for further
customized analysis in order to improve communication efficiency, coordination,
Tacit knowledge dissemination and robustness. This is the first comparative
study of real Knowledge Networks in terms of graph theoretic methods.


title:
Open Quantum to classical phases transition in the stochastic
  hydrodynamic analogy: the explanation of the Lindemann relation and the
  analogies between the maximum of density at He lambda point and that one at
  water-ice phase transition

abstract:
  In the present paper the gas, liquid and solid phases made of structureless
particles, are visited to the light of the quantum stochastic hydrodynamic
analogy (SQHA). The SQHA shows that the open quantum mechanical behavior is
maintained on a distance shorter than the theory-defined quantum correlation
length (lc). When, the physical length of the problem is larger than lc, the
model shows that the quantum (potential) interactions may have a finite range
of interaction maintaining the non-local behavior on a finite distance quantum
non-locality length lq. The present work shows that when the mean molecular
distance is larger than the quantum non-locality length we have a classical
phases (gas and van der Waals liquids) while when the mean molecular distance
becomes smaller than lq or than lc we have phases such as the solid crystal or
the superfluid one, respectively, that show quantum characteristics. The model
agrees with Lindemann empirical law (and explains it), for the mean square
deviation of atom from the equilibrium position at melting point of crystal,
and shows a connection between the maximum density at the He lambda point and
that one near the water-ice solidification point.


title:
AC Susceptibility of the Dipolar Spin Ice Dy2Ti2O7: Experiments and
  Monte Carlo Simulations

abstract:
  Experimental data of the frequency-dependent ac susceptibility for the
dipolar spin ice Dy2Ti2O7 has been analyzed by Monte Carlo simulations on the
basis of the single-spin-flip Metropolis algorithm. We have directly evaluated
the ac susceptibility by applying an ac magnetic field. We found that the
simulated behaviors reproduces the experimental behavior of the ac
susceptibility in the temperature range from 0.6 to 1.0 K, where dilute
magnetic monopoles diffusively move. The conversion factor from simulation time
to real time, i.e., the rate of hopping of monopoles to nearest-neighbor sites,
strongly depends on temperature.


title:
Linewidth of the electromagnetic radiation from Josephson junctions near
  cavity resonances

abstract:
  The powerful terahertz emission from intrinsic Josephson junctions in high-Tc
cuprate superconductors has been detected recently. The synchronization of
different junctions is enhanced by excitation of the geometrical cavity
resonance. A key characteristic of the radiation is its linewidth. In this
work, we study the intrinsic linewidth of the radiation near the internal
cavity resonance. Surprisingly, this problem was never considered before,
neither for a single Josephson junction nor for a stack of the intrinsic
Josephson junctions realized in cuprate superconductors. The linewidth appears
due to the slow phase diffusion, which is determined by the dissipation and
amplitude of the noise. We found that both these parameters are resonantly
enhanced when the cavity mode is excited but enhancement of the dissipation
dominates leading to the net suppression of diffusion and dramatic narrowing of
the linewidth. The line shape changes from Lorentzian to Gaussian when either
the Josephson frequency is shifted away from the resonance or the temperature
is increased.


title:
Electromagnetic Sub-Wavelength Imaging Using Signal Processing
  Techniques Combined With Phase Conjugation

abstract:
  In this paper, we show how we can combine Electromagnetics (EM) with signal
processing algorithms to enhance the image resolution over that can be realized
by using Electromagnetics techniques alone. We discuss several signal
processing techniques, including the Correlation Method (CM) and the Minimum
Residual Power Search Method (MRPSM), and apply them for sub-wavelength imaging
in the microwave regime by combining them with the well-known Phase Conjugation
(PC) algorithm, for instance, which has been extensively used in the
electromagnetics area for imaging purposes. We show that by using this type of
combination we can achieve sub-wavelength resolution on the order of
{\lambda}0/10, even if the measurement plane is not located in the very
near-field region of the source. We describe the proposed imaging algorithms in
detail and study their abilities to resolve at sub-wavelength level. We also
study their computational efficiencies in a comparative manner.


title:
Infrared photometry of Young Massive Clusters in the starburst galaxy
  NGC 4214

abstract:
  We present the results of an infrared photometric survey performed with
NICS@TNG in the nearby starburst galaxy NGC 4214. We derived accurate
integrated JK magnitudes of 10 young massive clusters and compared them with
the already available Hubble Space Telescope ultraviolet colors. These clusters
are located in the combined ultraviolet-infrared colors planes on well defined
sequences, whose shapes allow a precise determination of their age. By means of
the comparison with suitable stellar evolution models we estimated ages,
metallicities, reddening and masses of these clusters. All the analyzed
clusters appear to be younger than log(t/yr)<8.4, moderately metal-rich and
slightly less massive than present-day Galactic globular clusters. The derived
ages for clusters belonging to the secondary HII star forming complex are
significantly larger than those previously estimated in the literature. We also
discuss the possibility of using the ultraviolet-infrared color-color diagram
to select candidate young massive clusters hosting multiple stellar
populations.


title: On Rogue wave in the Kundu-DNLS equation

abstract:
  In this paper, the determinant representation of the n-fold Darboux
transformation (DT) of the Kundu-DNLS equation is given. Based on our analysis,
the soliton solutions, positon solutions and breather solutions of the
Kundu-DNLS equation are given explicitly. Further, we also construct the rogue
wave solutions which are given by using the Taylor expansion of the breather
solution. Particularly, these rogue wave solutions possess several free
parameters. With the help of these parameters, these rogue waves constitute
several patterns, such as fundamental pattern, triangular pattern, circular
pattern.


title:
A discrete time method to the first variation of fractional order
  variational functionals

abstract:
  The fact that the first variation of a variational functional must vanish
along an extremizer is the base of most effective solution schemes to solve
problems of the calculus of variations. We generalize the method to variational
problems involving fractional order derivatives. First order splines are used
as variations, for which fractional derivatives are known. The
Grunwald-Letnikov definition of fractional derivative is used, because of its
intrinsic discrete nature that leads to straightforward approximations.


title:
(Quasi)additivity properties of the Legendre--Fenchel transform and its
  inverse, with applications in probability

abstract:
  The notion of the H\"older convolution is introduced. The main result is
that, under general conditions on functions L_1, ..., L_n, the function inverse
to the Legendre--Fenchel transform of the H\"older convolution of L_1, ..., L_n
coincides with the sum of the inverses of the Legendre--Fenchel transforms of
the individual functions L_1, ..., L_n. Applications to probability theory are
presented. In particular, an upper bound on the quantiles of the distribution
of the sum of random variables is given.


title: Turtle: Identifying frequent k-mers with cache-efficient algorithms

abstract:
  Counting the frequencies of k-mers in read libraries is often a first step in
the analysis of high-throughput sequencing experiments. Infrequent k-mers are
assumed to be a result of sequencing errors. The frequent k-mers constitute a
reduced but error-free representation of the experiment, which can inform read
error correction or serve as the input to de novo assembly methods. Ideally,
the memory requirement for counting should be linear in the number of frequent
k-mers and not in the, typically much larger, total number of k-mers in the
read library.
  We present a novel method that balances time, space and accuracy requirements
to efficiently extract frequent k-mers even for high coverage libraries and
large genomes such as human. Our method is designed to minimize cache-misses in
a cache-efficient manner by using a Pattern-blocked Bloom filter to remove
infrequent k-mers from consideration in combination with a novel
sort-and-compact scheme, instead of a Hash, for the actual counting. While this
increases theoretical complexity, the savings in cache misses reduce the
empirical running times. A variant can resort to a counting Bloom filter for
even larger savings in memory at the expense of false negatives in addition to
the false positives common to all Bloom filter based approaches. A comparison
to the state-of-the-art shows reduced memory requirements and running times.
Note that we also provide the first competitive method to count k-mers up to
size 64.


title: A stellar-mass BH in a transient, low luminosity ULX in M31?

abstract:
  We present a multi-wavelenght study of the recently discovered Ultraluminous
X-ray transient XMMUJ004243.6+412519 (ULX2 hereafter) in M31, based on Swift
data and the 1.8-m Copernico Telescope in Asiago (Italy). Undetected until
January 2012, the source suddenly showed a powerful X-ray emission with a
luminosity of 1e38 erg/s (assuming a distance of 780 kpc). In the following
weeks, its luminosity overcame 1e39 erg/s, remaining fairly constant for at
least 40 days and fading below 1e38 erg/s in the next 200 days. The spectrum
can be well described by a single multi-color disk blackbody model which
progressively softened during the decay (from kT=0.9 keV to 0.4 keV). No
emission from ULX2 was detected down to 22 mag in the optical band and to 23-24
mag in the near ultraviolet. We compare its properties with those of other
known ULXs and Galactic black hole transients, finding more similarities with
the latter.


title:
High-bandwidth quantum memory protocol for storing single photons in
  rare-earth doped crystals

abstract:
  We present a detailed analysis of a high-bandwidth quantum memory protocol
for storing single photons in a rare-earth-ion doped crystal. The basic idea is
to benefit from a coherent free-induced decay type re-emission which occurs
naturally when a photon with a broadband spectrum is absorbed by a narrow
atomic transition in an optically dense ensemble. This allows for a
high-bandwidth memory for realistic material parameters. Long storage time and
on-demand readout are obtained by means of spins states in a lambda-type
configuration, through the transfer of the optical coherence to a spin
coherence (so-called spin-wave storage). We give explicit formulas and show
numerical results which make it possible to gain insight into the dependence of
the memory efficiency on the optical depth and on the width and the shape of
stored photons. We present a feasibility study in rare-earth doped crystals and
show that high efficiencies and high bandwidth can be obtained with realistic
parameters. High-bandwidth memories using spin-wave storage offers the
possibility of very high time-bandwidth products, which is important for
experiment where high repetition rates are needed.


title: Generalized fluxes in matrix compactifications

abstract:
  In the recent years a lot of attention is focused on unconventional string
compactifications. A variety of different but related frameworks was developed
in order to address issues such as duality invariance, non-geometry and
non-commutativity in string theory. In this contribution we review and clarify
the approach that goes through matrix models. Furthermore, we discuss some
connections of this framework to other related approaches.


title:
Sharp Weighted Bounds for Multilinear fractional Maximal type Operators
  with Rough Kernels

abstract:
  In this paper, we will give the weighted bounds for multilinear fractional
maximal type operators $\mathcal{M}_{\Omega,\alpha}$ with rough homogeneous
kernels. We obtain a mixed $A_{(\vec{P},q)}-A_\infty$ bound and a $A_{\vec{P}}$
type estimate for $\mathcal{M}_{\Omega,\alpha}$. As an application, we give an
almost sharp estimate for the multilinear fractional integral operator with
rough kernels $\mathcal{I}_{\Omega,\alpha}$.


title: Higgs Boson Mass in Low Energy SUSY Models with Vector-like Matters

abstract:
  We show that the gauge mediation models with vector-like matters can explain
the Higgs boson mass of 126 GeV without large soft scalar masses nor a large
left-right mixing of the stops. The scenario has interesting features: the
existence of the light non-colored SUSY particles accessible at the LHC and
ILC, the explanation of the muon g-2 and the possibility of the enhanced
di-photon decay rate of the Higgs boson.


title: Generalizations of Carmichael numbers I

abstract:
  A composite positive integer $n$ is said to be a {\it weak Carmichael number}
if
  $$
  \sum_{\gcd(k,n)=1\atop 1\le k\le n-1}k^{n-1}\equiv \varphi(n) \pmod{n}.
\leqno(1)
  $$ It is proved that a composite positive integer $n$ is a weak Carmichael
number if and only if $p-1\mid n-1$ for every prime divisor $p$ of $n$. This
together with Korselt's criterion yields the fact that every Carmichael number
is also a weak Carmichael number.
  In this paper we mainly investigate arithmetic properties of weak Carmichael
numbers. Motivated by the investigations of Carmichael numbers in the last
hundred years, here we establish several related results, notions, examples and
computatinoal searches for weak Carmichael numbers and numbers closely related
to weak Carmichael numbers. Furthermore, using the software {\tt Mathematica
8}, we present the table containing all non-prime powers weak Carmichael
numbers less than $2\times 10^6$.
  Motivated by heuristic arguments, our computations and some old conjectures
and results for Carmichael numbers, we propose several conjectures for weak
Carmichael numbers and for some other classes of Carmichael like numbers.
  Finally, we consider weak Carmichael numbers in light of Fermat primality
test. We believe that it can be of interest to involve certain particular
classes of weak Carmichael numbers in some problems concerning Fermat-like
primality tests and the generalized Riemann hypothesis.


title:
A Galerkin approximation scheme for the mean correction in a
  mean-reversion stochastic differential equation

abstract:
  This paper is concerned with the following Markovian stochastic differential
equation of mean-reversion type \[ dR_t= (\theta +\sigma \alpha(R_t, t))R_t dt
+\sigma R_t dB_t \] with an initial value $R_0=r_0\in\mathbb{R}$, where
$\theta\in\mathbb{R}$ and $\sigma>0$ are constants, and the mean correction
function $\alpha:\mathbb{R}\times[0,\infty)\to \alpha(x,t)\in\mathbb{R}$ is
twice continuously differentiable in $x$ and continuously differentiable in
$t$. We first derive that under the assumption of path independence of the
density process of Girsanov transformation for the above stochastic
differential equation, the mean correction function $\alpha$ satisfies a
non-linear partial differential equation which is known as the viscous Burgers
equation. We then develop a Galerkin type approximation scheme for the function
$\alpha$ by utilizing truncation of discretised Fourier transformation to the
viscous Burgers equation.


title:
Teor\'ia Erg\'odica de los Atractores Topol\'ogicos y Estad\'isticos
  (Ergodic Theory of Topological and Statistical Attractors) (Spanish)

abstract:
  This is a textbook, in Spanish, for an introductory short course that
focusses on the ergodic properties of topological and statistical attractors.
It is directed to graduate students in Mathematics and related Science, in
particular to the students-participants of the XXVI Escuela Venezolana de
Matem\'atica. The first three chapters include a review of the basic concepts
and properties of the ergodic theory and of the topological and differentiable
dynamics of systems that evolve on discrete time. They do not require from the
reader previous knowledge on Dynamical Systems. The latter three chapters
develop the theory of topological attractors, SRB measures, and the existence
of Gibbs and physical measures for hyperbolic and sufficiently differentiable
systems. Finally, for continuous and non necessarily differentiable systems, we
include a review of Milnor's and Ilyashenko's or statistical attractors, the
proof of their existence and the relation between statistical attractors and
the "SRB-like" or pseudo-physical measures.


title:
Perturbative renormalization functions of local operators for staggered
  fermions with stout improvement

abstract:
  In this paper we present the perturbative computation of the renormalization
functions for the quark field and for a complete set of ultra-local fermion
bilinears. The computation of the relevant Green's functions was carried out at
1-loop level for the staggered action using massive fermions. The gluon links
which appear both in the fermion action and in the definition of the bilinears
have been improved by applying a stout smearing procedure up to 2 times,
iteratively. In the gluon sector we employed the Symanzik improved gauge action
for different sets of values of the Symanzik coefficients. The renormalization
functions are presented in (two variants of) the RI' and in the MSbar
renormalization scheme; the dependence on all stout parameters, as well as on
the fermion mass, the gauge fixing parameter and the renormalization scale, is
shown explicitly. This work is related to our recent paper [Phys. Rev. D86
(2012) 094512, arXiv:1209.6015]. To make our results easily accessible to the
reader, we include them in the distribution package of this paper, as a
Mathematica input file, Staggered.m.


title:
On the existence of three closed magnetic geodesics for subcritical
  energies

abstract:
  We consider exact magnetic flows on closed orientable surfaces. We show that
for almost every energy $\kappa$ below Ma\~n\'e's critical value of the
universal covering there are always at least three distinct closed magnetic
geodesics with energy $\kappa$. If in addition the energy level is assumed to
be non-degenerate we prove existence of infinitely many closed magnetic
geodesics.


title:
Aharonov-Bohm rings with strong spin-orbit interaction: the role of
  sample-specific properties

abstract:
  We present low-temperature transport experiments on Aharonov-Bohm (AB) rings
fabricated from two-dimensional hole gases in p-type GaAs/AlGaAs
heterostructures. Highly visible h/e (up to 15%) and h/2e oscillations, present
for different gate voltages, prove the high quality of the fabricated devices.
Like in previous work, a clear beating pattern of the h/e and h/2e oscillations
is present in the magnetoresistance, producing split peaks in the Fourier
spectrum. The magnetoresistance evolution is presented and discussed as a
function of temperature and gate voltage. It is found that sample specific
properties have a pronounced influence on the observed behavior. For example,
the interference of different transverse modes or the interplay between h/e
oscillations and conductance fluctuations can produce the features mentioned
above. In previous work they have occasionally been interpreted as signatures
of spin-orbit interaction (SOI)-induced effects. In the light of these results,
the unambiguous identification of SOI-induced phase effects in AB rings remains
still an open and challenging experimental task.


title:
A reconstruction of modified holographic Ricci dark energy in $f(R,T)$
  gravity

abstract:
  In this paper, we consider a recently proposed model of Dark Energy (DE) know
as Modified Holographic Ricci DE (MHRDE) (which is function of the Hubble
parameter and its first derivative with respect to the cosmic time $t$) in the
light of the $f(R,T)$ model of modified gravity, considering the particular
model $f(R,T) = \mu R + \nu T$, with $\mu$ and $\nu$ constants. The equation of
state (EoS) parameter $\omega_{\Lambda}$ approaches but never reaches the value
-1, implying a quintessence-like behavior of the model. The deceleration
parameter $q$ passes from decelerated to accelerated phase at a redshift of
$z\approx 0.2$, showing also a small dependence from the values of the
parameters considered. Thanks to the statefinder diagnostic analysis, we
observed that the $\Lambda$CDM phase for the considered model is attainable. We
observed that the fractional energy densities for DE and DM $\Omega_{\Lambda}$
and $\Omega_m$ have, respectively, an increasing and a decreasing pattern with
the evolution of the universe, indicating an evolution from matter to DE
dominated universe. Finally, studying the squared speed of the sound $v_s^2$
for our model, we found that is classically stable.


title: Constraint on Universal Extra Dimensions from scalar boson searches

abstract:
  We show the bounds on five- and six-dimensional Universal Extra Dimension
models from the result of the Higgs boson searches at the Large Hadron Collider
and electroweak precision measurement. The latest data released by the ATLAS
and the CMS gives the lower bounds on Kaluza-Klein scale which are from 650 GeV
to 1350 GeV depending on models from Higgs to diboson/diphoton decay signal.
The Higgs production cross section can be enhanced by factor 1.5 in crude
estimation, diphoton decay signal is suppressed about 10%. Electroweak
precision measurement also gives the lower bounds as from 700 GeV to 1500 GeV.


title: Point contacts and localization in generic helical liquids

abstract:
  We consider two helical liquids on opposite edges of a narrow two-dimensional
topological insulator, which are connected by one or several local tunnel
junctions. In the presence of spatially inhomogeneous Rashba spin-orbit
coupling, the spin textures of the helical states on opposite edges are
different. We demonstrate that this has a strong impact on the electron
transport between the edges. In particular, in the case of many random tunnel
contacts, the localization length depends strongly on the spin textures of the
edge states.


title:
Covariant Renormalizable Gravity Theories on (Non) Commutative Tangent
  Bundles

abstract:
  The field equations in modified gravity theories possess an important
decoupling property with respect to certain classes of nonholonomic frames.
This allows us to construct generic off--diagonal solutions depending on all
spacetime coordinates via generating and integration functions containing
(un--)broken symmetry parameters. Some corresponding analogous models have a
nice ultraviolet behavior and seem to be (super) renormalizable in a sense of
covariant modifications of Ho\v{r}ava--Lifshits (HL) and ghost free gravity.
The apparent noncommutativity and breaking of Lorentz invariance by quantum
effects can be encoded into geometric objects and basic equations on
noncommutative tangent Lorentz. The constructions can be extended to include
conjectured covariant reonormalizable models with effective Einstein fields
with (non)commutative variables.


title:
Controlling Self-Organizing Dynamics on Networks Using Models that
  Self-Organize

abstract:
  Controlling self-organizing systems is challenging because the system
responds to the controller. Here we develop a model that captures the essential
self-organizing mechanisms of Bak-Tang-Wiesenfeld (BTW) sandpiles on networks,
a self-organized critical (SOC) system. This model enables studying a simple
control scheme that determines the frequency of cascades and that shapes
systemic risk. We show that optimal strategies exist for generic cost functions
and that controlling a subcritical system may drive it to criticality. This
approach could enable controlling other self-organizing systems.


title: Analytic solutions for neutrino momenta in decay of top quarks

abstract:
  We employ a geometric approach to analytically solving equations of
constraint on the decay of top quarks involving leptons. The neutrino momentum
is found as a function of the 4-vectors of the associated bottom quark and
charged lepton, the masses of the top quark and W boson, and a single
parameter, which constrains it to an ellipse. We show how the measured
imbalance of momenta in the event reduces the solutions for neutrino momenta to
a discrete set, in the cases of one or two top quarks decaying to leptons. The
algorithms can be implemented concisely with common linear algebra routines.


title:
Nematic State of the Pnictides Stabilized by the Interplay Between Spin,
  Orbital, and Lattice Degrees of Freedom

abstract:
  The nematic state of the iron-based superconductors is studied in the undoped
limit of the three-orbital ($xz$, $yz$, $xy$) spin-fermion model via the
introduction of lattice degrees of freedom. Monte Carlo simulations show that
in order to stabilize the experimentally observed lattice distortion and
nematic order, and to reproduce photoemission experiments, {\it both} the
spin-lattice and orbital-lattice couplings are needed. The interplay between
their respective coupling strengths regulates the separation between the
structural and N\'eel transition temperatures. Experimental results for the
temperature dependence of the resistivity anisotropy and the angle-resolved
photoemission (ARPES) orbital spectral weight are reproduced by the present
numerical simulations.


title: A Heuristic for Magic and Antimagic Graph Labellings

abstract:
  Graph labellings have been a very fruitful area of research in the last four
decades. However, despite the staggering number of papers published in the
field (over 1000), few general results are available, and most papers deal with
particular classes of graphs and methods. Here we approach the problem from the
computational viewpoint, and in a quite general way. We present the existence
problem of a particular labelling as a combinatorial optimization problem, then
we discuss the possible strategies to solve it, and finally we present a
heuristic for finding different classes of labellings, like vertex-, edge-, or
face-magic, and $(a, d)$-antimagic $(v, e, f)$-labellings. The algorithm has
been implemented in C++ and MATLAB, and with its aid we have been able to
derive new results for some classes of graphs, in particular, vertex-antimagic
edge labellings for small graphs of the type $P_2^r \times P_3^s$, for which no
general construction is known so far.


title: AGN in dusty hosts: implications for galaxy evolution

abstract:
  We present strong empirical evidence for a physical connection between the
occurrence of a starburst (SB) and a luminous AGN phase. Drawing infrared (IR),
X-ray, and optically selected samples from COSMOS, we find that the locus of
type-2 AGN hosts in the optical colour-magnitude (U-V/V) and colour-colour
(U-V/V-J) space significantly overlaps with that of IR-luminous (L_IR > 10^10
L_sun) galaxies. Based on our observations, we propose that, when
simultaneously building their black hole and stellar masses, type-2 AGN hosts
are located in the same part of colour-colour space as dusty star-forming
galaxies. In fact, our results show that IR-luminous galaxies at z<1.5 are on
average 3 times more likely to host a type-2 AGN (L_X > 10^42 erg/s) than would
be expected serendipitously, if AGN and star-formation events were unrelated.
In addition, the optical and infrared properties of the AGN/SB hybrid systems
tentatively suggest that the AGN phase might be coeval with a particularly
active phase in a galaxy's star-formation history. Interestingly, we also find
a significant fraction of type-2 AGN hosts offset from the dusty galaxy
sequence in colour-colour space, possibly representing a transitional or
post-starburst phase in galaxy evolution. Our findings are consistent with a
scenario whereby AGN play a role in the termination of star-formation in
massive galaxies.


title:
Do Rainbow Trout and Their Hybrids Outcompete Cutthroat Trout in a
  Lentic Ecosystem?

abstract:
  Much has been written about introduced rainbow trout interbreeding and
outcompeting native cutthroat trout. However, specific mechanisms have not been
thoroughly explored, and most data is limited to lotic ecosystems. Samples of
Snake River cutthroat trout (Oncorhynchus clarkii bouvieri), the
rainbow-cutthroat hybrid, the cutbow trout (Onchorhynchus mykiss x clarkii),
and rainbow trout (Oncorhynchus mykiss), were obtained from a lentic ecosystem
(Eleven Mile Reservoir, Colorado) by creel surveys conducted from May to
October, 2012. The total length and weight of each fish was measured and the
relative condition factor of each fish was computed using expected weight from
weight-length relationships from the Colorado Division of Parks and Wildlife
(CDPW). Data from the CDPW collected from 2003-2010 in the same lentic
ecosystem were used to compute relative condition factors for additional
comparison, as was independent creel survey data from 2011. Cutthroat trout
were plump: the mean relative condition factor of the cutthroat trout was
112.0% (+/- 1.0%). Cutbow hybrid trout were close to the expected weights with
a mean relative condition factor of 99.8% (+/- 0.6%). Rainbow trout were
thinner with a mean relative condition factor of 96.4% (+/- 1.4%). Comparing
mean relative condition factors of CDPW data from earlier years and plotting
the 2012 data relative to percentile curves also shows the same trend of
cutthroat trout being plumper than expected and rainbow trout being thinner
than the cutthroat trout, with the hybrid cutbow trout in between. This data
supports the hypothesis that rainbow trout do not outcompete cutthroat trout in
lentic ecosystems. Comparison with data from three other Colorado reservoirs
also shows that cutthroat trout tend to be more plump than rainbow trout and
their hybrids in sympatric lentic ecosystems.


title: Higgs Spin Determination in the WW channel and beyond

abstract:
  After the discovery of the 126 GeV resonance at the LHC, the determination of
its features, including its spin, is a very important ongoing task. In order to
distinguish the two most likely spin hypotheses, spin-0 or spin-2, we study the
phenomenology of a light Higgs-like spin-2 resonance produced in different
gluon-fusion and vector-boson-fusion processes at the LHC. Starting from an
effective model for the interaction of a spin-2 particle with the SM gauge
bosons, we calculate cross sections and differential distributions within the
Monte Carlo program Vbfnlo. We find that with specific model parameters such a
spin-2 resonance can mimic SM Higgs rates and transverse-momentum distributions
in $\gamma \gamma$, $WW$ and $ZZ$ decays, whereas several distributions allow
to separate spin-2 from spin-0, independently of the spin-2 model parameters.


title:
The UVES Large Program for Testing Fundamental Physics: I Bounds on a
  change in alpha towards quasar HE 2217-2818

abstract:
  Absorption line systems detected in quasar spectra can be used to compare the
value of the fine-structure constant, {\alpha}, measured today on Earth with
its value in distant galaxies. In recent years, some evidence has emerged of
small temporal and also spatial variations of {\alpha} on cosmological scales
which may reach a fractional level of ~ 10 ppm (parts per million). To test
these claims we are conducting a Large Program with the VLT UVES . We are
obtaining high-resolution (R ~ 60000 and high signal-to-noise ratio (S/N ~ 100)
UVES spectra calibrated specifically for this purpose. Here we analyse the
first complete quasar spectrum from this Program, that of HE 2217-2818. We
apply the Many Multiplet method to measure {\alpha} in 5 absorption systems
towards this quasar: zabs = 0.7866, 0.9424, 1.5558, 1.6279 and 1.6919. The most
precise result is obtained for the absorber at zabs = 1.6919 where 3 Fe II
transitions and Al II {\lambda}1670 have high S/N and provide a wide range of
sensitivities to {\alpha}. The absorption profile is complex, with several very
narrow features, and requires 32 velocity components to be fitted to the data.
Our final result for the relative variation in {\alpha} in this system is
Delta{\alpha}/{\alpha} = +1.3 +/- 2.4stat +/- 1.0sys ppm. This is one of the
tightest current bounds on {\alpha} variation from an individual absorber. The
absorbers towards quasar HE 2217-2818 reveal no evidence for variation in
{\alpha} at the 3 ppm precision level (1{\sigma} confidence). If the recently
reported 10 ppm dipolar variation of {\alpha} across the sky were correct, the
expectation at this sky position is (3.2-5.4) +/-1.7 ppm depending on dipole
model used . Our constraint of Delta{\alpha}/{\alpha}=+1.3+/-2.4stat +/-1.0sys
ppm is not inconsistent with this expectation.


title:
Distributed Optimization With Local Domains: Applications in MPC and
  Network Flows

abstract:
  In this paper we consider a network with $P$ nodes, where each node has
exclusive access to a local cost function. Our contribution is a
communication-efficient distributed algorithm that finds a vector $x^\star$
minimizing the sum of all the functions. We make the additional assumption that
the functions have intersecting local domains, i.e., each function depends only
on some components of the variable. Consequently, each node is interested in
knowing only some components of $x^\star$, not the entire vector. This allows
for improvement in communication-efficiency. We apply our algorithm to model
predictive control (MPC) and to network flow problems and show, through
experiments on large networks, that our proposed algorithm requires less
communications to converge than prior algorithms.


title: Geometric Optimization Methods for Adaptive Filtering

abstract:
  The techniques and analysis presented in this thesis provide new methods to
solve optimization problems posed on Riemannian manifolds. These methods are
applied to the subspace tracking problem found in adaptive signal processing
and adaptive control. A new point of view is offered for the constrained
optimization problem. Some classical optimization techniques on Euclidean space
are generalized to Riemannian manifolds. Several algorithms are presented and
their convergence properties are analyzed employing the Riemannian structure of
the manifold. Specifically, two new algorithms, which can be thought of as
Newton's method and the conjugate gradient method on Riemannian manifolds, are
presented and shown to possess quadratic and superlinear convergence,
respectively. These methods are applied to several eigenvalue and singular
value problems, which are posed as constrained optimization problems. ...


title: Performance Evaluation of Video Communications over 4G Network

abstract:
  With exponential increase in the volumes of video traffic in cellular
net-works, there is an increasing need for optimizing the quality of video
delivery. 4G networks (Long Term Evolution Advanced or LTE A) are being
introduced in many countries worldwide, which allow a downlink speed of upto 1
Gbps and uplink of 100 Mbps over a single base station. In this paper, we
characterize the performance of LTE A physical layer in terms of transmitted
video quality when the channel condi-tions and LTE settings are varied. We test
the performance achieved as the channel quality is changed and HARQ features
are enabled in physical layer. Blocking and blurring metrics were used to model
image quality.


title: Topological Superconductor-Luttinger Liquid Junctions

abstract:
  Experimental evidence was recently obtained for topological superconductivity
in spin-orbit coupled nano wires in a magnetic field, proximate to an s-wave
superconductor. When only part of the wire contacts the superconductor, a
localized Majorana mode exists at the junction between superconducting and
normal parts of the nanowire. We consider here the case of a T-junction between
the superconductor and two normal nanowires and also the case of a single wire
with two (or more) partially filled bands in the normal part. We find that
coupling this 2-channel Luttinger liquid to the single Majorana mode at the
junction produces frustration, leading to a critical point separating phases
with perfect Andreev scattering in one channel and perfect normal scattering in
the other.


title:
The Fate of Planetesimals in Turbulent Disks with Dead Zones. I. The
  Turbulent Stirring Recipe

abstract:
  Turbulence in protoplanetary disks affects planet formation in many ways.
While small dust particles are mainly affected by the aerodynamical coupling
with turbulent gas velocity fields, planetesimals and larger bodies are more
affected by gravitational interaction with gas density fluctuations. For the
latter process, a number of numerical simulations have been performed in recent
years, but a fully parameter-independent understanding has not been yet
established. In this study, we present simple scaling relations for the
planetesimal stirring rate in turbulence driven by magnetorotational
instability (MRI), taking into account the stabilization of MRI due to Ohmic
resistivity. We begin with order-of-magnitude estimates of the
turbulence-induced gravitational force acting on solid bodies and associated
diffusion coefficients for their orbital elements. We then test the predicted
scaling relations using the results of recent Ohmic-resistive MHD simulations
by Gressel et al. We find that these relations successfully explain the
simulation results if we properly fix order-of-unity uncertainties within the
estimates. We also update the saturation predictor for the density fluctuation
amplitude in MRI-driven turbulence originally proposed by Okuzumi & Hirose.
Combination of the scaling relations and saturation predictor allows to know
how the turbulent stirring rate of planetesimals depends on disk parameters
such as the gas column density, distance from the central star, vertical
resistivity distribution, and net vertical magnetic flux. In Paper II, we apply
our recipe to planetesimal accretion to discuss its viability in turbulent
disks.


title:
The fate of planetesimals in turbulent disks with dead zones. II. Limits
  on the viability of runaway accretion

abstract:
  A critical phase in the standard model for planet formation is the runaway
growth phase. During runaway growth bodies in the 0.1--100 km size range
(planetesimals) quickly produce a number of much larger seeds. The runaway
growth phase is essential for planet formation as the emergent planetary
embryos can accrete the leftover planetesimals at large gravitational focusing
factors. However, torques resulting from turbulence-induced density
fluctuations may violate the criterion for the onset of runaway growth, which
is that the magnitude of the planetesimals' random (eccentric) motions are less
than their escape velocity. This condition represents a more stringent
constraint than the condition that planetesimals survive their mutual
collisions. To investigate the effects of MRI turbulence on the viability of
the runaway growth scenario, we apply our semi-analytical recipes of Paper I,
which we augment by a coagulation/fragmentation model for the dust component.
We find that the surface area-equivalent abundance of 0.1 micron particles is
reduced by factors 10^2--10^3, which tends to render the dust irrelevant to the
turbulence. We express the turbulent activity in the midplane regions in terms
of a size s_run above which planetesimals will experience runaway growth. We
find that s_run is mainly determined by the strength of the vertical net field
that threads the disks and the disk radius. At disk radii beyond 5 AU, s_run
becomes larger than ~100 km and the collision times among these bodies longer
than the duration of the nebula phase. Our findings imply that the classical,
planetesimal-dominated, model for planet formation is not viable in the outer
regions of a turbulent disk.


title:
Probability Friends-of-Friends (PFOF) Group Finder: Performance Study
  and Observational Data Applications on Photometric Surveys

abstract:
  (Abridged) In tandem with observational datasets, we utilize realistic mock
catalogs, based on a semi-analytic galaxy formation model, constructed
specifically for Pan-STARRS1 Medium Deep Surveys in order to assess the
performance of the Probability Friends-of-Friends (PFOF, Liu et al.) group
finder, and aim to develop a grouping optimization method applicable to surveys
like Pan-STARRS1. Producing mock PFOF group catalogs under a variety of
photometric redshift accuracies ({\sigma}{\Delta}z/(1+zs)), we find that
catalog purities and completenesses from ``good' {\sigma}{\Delta}z/(1+zs)) ~
0.01) to ``poor' {\sigma}{\Delta}z/(1+zs)) ~ 0.07) photo-zs gradually degrade
respectively from 77% and 70% to 52% and 47%. To avoid model dependency of the
mock for use on observational data we apply a ``subset optimization' approach,
using spectroscopic-redshift group data from the target field to train the
group finder for application to that field, as an alternative method for the
grouping optimization. We demonstrate this approach using these
spectroscopically identified groups as the training set, i.e. zCOSMOS groups
for PFOF searches within PS1 Medium Deep Field04 (PS1MD04) and DEEP2 EGS groups
for searches in PS1MD07. We ultimately apply PFOF to four datasets spanning the
photo-z uncertainty range from 0.01 to 0.06 in order to quantify the dependence
of group recovery performance on photo-z accuracy. We find purities and
completenesses calculated from observational datasets broadly agree with their
mock analogues. Further tests of the PFOF algorithm are performed via matches
to X-ray clusters identified within the PS1MD04 and COSMOS footprints. Across
over a decade in group mass, we find PFOF groups match ~85% of X-ray clusters
in COSMOS and PS1MD04, but at a lower statistical significance in the latter.


title: Recursion Rules for the Hypergeometric Zeta Functions

abstract:
  The hypergeometric zeta function is defined in terms of the zeros of the
Kummer function M(a, a + b; z). It is established that this function is an
entire function of order 1. The classical factorization theorem of Hadamard
gives an expression as an infinite product. This provides linear and quadratic
recurrences for the hypergeometric zeta function. A family of associated
polynomials is characterized as Appell polynomials and the underlying
distribution is given explicitly in terms of the zeros of the associated
hypergeometric function. These properties are also given a probabilistic
interpretation in the framework of Beta distributions.


title: On the Relative Quantities Occurring within Physical Data Sets

abstract:
  A statistical measure is given expressing relative occurrences of quantities
within a given data set. Application of this measure on several real life
physical data sets and some abstract distributions are shown to yield
consistent results. These empirical results also correspond almost exactly to
the theoretical converging limit of such a measure mathematically constructed
for k over x distribution defined over an infinite range.


title: Post-Matrix Product State Methods: To tangent space and beyond

abstract:
  We develop in full detail the formalism of tangent states to the manifold of
matrix product states, and show how they naturally appear in studying
time-evolution, excitations and spectral functions. We focus on the case of
systems with translation invariance in the thermodynamic limit, where momentum
is a well defined quantum number. We present some new illustrative results and
discuss analogous constructions for other variational classes. We also discuss
generalizations and extensions beyond the tangent space, and give a general
outlook towards post matrix product methods.


title: Giant magnetoresistance in the variable range hopping regime

abstract:
  We predict the universal power law dependence of localization length on
magnetic field in the strongly localized regime. This effect is due to the
orbital quantum interference. Physically, this dependence shows up in an
anomalously large negative magnetoresistance in the hopping regime. The reason
for the universality is that the problem of the electron tunneling in a random
media belongs to the same universality class as directed polymer problem even
in the case of wave functions of random sign. We present numerical simulations
which prove this conjecture. We discuss the existing experiments that show
anomalously large magnetoresistance. We also discuss the role of localized
spins in real materials and the spin polarizing effect of magnetic field.


title: Ultra-Compact Dwarfs around NGC 3258 in Antlia

abstract:
  We present the first compact stellar systems with luminosities in the range
of ultra-compact dwarfs (UCDs), discovered in the Antlia galaxy cluster (-10.5
< M_V < -11.6). The magnitude limit between UCDs and globular clusters (CGs) is
discussed. By means of imaging from VLT (FORS1), CTIO (MOSAIC), and the HST
(ACS) archive, eleven UCDs/bright GCs are selected on the basis of photometry
and confirmed as Antlia members through radial velocities measured on new
GEMINI (GMOS-S) spectra. In addition, nine UCD candidates are identified taking
into account properties derived from their surface brightness profiles. All of
them, members and candidates, are located in the proximity of NGC\,3258, one of
the two brightest elliptical galaxies in the cluster core. Antlia UCDs in this
sample present absolute magnitudes fainter than M_V ~ -11.6 mag and most of
them have colours within the blue GC range, falling only two within the red GC
range. Effective radii measured for the ones lying on the ACS field are in the
range R_eff = 3 - 11 pc and are similar to equivalent objects in other
clusters, obtained from the literature. The UCD sample shares the same
behaviour on the size-luminosity plane: a linear relation between R_eff and M_V
is present for UCDs brighter than M_V ~ -10.5 - -11 mag while no trend is
detected for fainter ones, that have an approximately constant R_eff. The
projected spatial distribution of UCDs, GCs and X-ray emission points to an
ongoing merger between two Antlia groups, dominated by NGC 3258 and NGC 3268.
Nuclei of dwarf elliptical galaxies and blue UCDs share the same locus on the
colour-magnitude diagram, supporting the hypothesis that some blue UCDs may be
remnants of stripped nucleated dwarfs.


title:
Coherent diffraction and holographic imaging of individual biomolecules
  using low-energy electrons

abstract:
  Modern microscopy techniques are aimed at imaging an individual molecule at
atomic resolution. Here we show that low-energy electrons with kinetic energies
of 50-250 eV offer a possibility of overcome the problem of radiation damage,
and obtaining images of individual biomolecules. Two experimental schemes for
obtaining images of individual molecules, holography and coherent diffraction
imaging, are discussed and compared. Images of individual molecules obtained by
both techniques, using low-energy electrons, are shown.


title:
A study on central diffractive f_0(980) and f_2(1270) meson production
  at the LHC

abstract:
  In this contribution we report on the investigation of central diffractive
production of mesons $f_0(980)$ and $f_2(1270)$ at the energy of Large Hadron
Collider in proton-proton collisions. The cross sections and rapidity
distributions for these low-lying mesons are analyzed. The Pomeron-Pomeron
process was considered relying on a nonperturbative Pomeron model which is
justified by the low mass of considered resonances. The associated theoretical
uncertainties are discussed.


title:
Mathematical Modeling of Product Rating: Sufficiency, Misbehavior and
  Aggregation Rules

abstract:
  Many web services like eBay, Tripadvisor, Epinions, etc, provide historical
product ratings so that users can evaluate the quality of products. Product
ratings are important since they affect how well a product will be adopted by
the market. The challenge is that we only have {\em "partial information"} on
these ratings: Each user provides ratings to only a "{\em small subset of
products}". Under this partial information setting, we explore a number of
fundamental questions: What is the "{\em minimum number of ratings}" a product
needs so one can make a reliable evaluation of its quality? How users' {\em
misbehavior} (such as {\em cheating}) in product rating may affect the
evaluation result? To answer these questions, we present a formal mathematical
model of product evaluation based on partial information. We derive theoretical
bounds on the minimum number of ratings needed to produce a reliable indicator
of a product's quality. We also extend our model to accommodate users'
misbehavior in product rating. We carry out experiments using both synthetic
and real-world data (from TripAdvisor, Amazon and eBay) to validate our model,
and also show that using the "majority rating rule" to aggregate product
ratings, it produces more reliable and robust product evaluation results than
the "average rating rule".


title: Residue Classes of the PPT Sequence

abstract:
  Primitive Pythagorean triples (PPT) may be put into different equivalence
classes using residues with respect to primes. We show that the probability
that the smaller odd number associated with the PPT triple is divisible by
prime p is 2/(p+1). We have determined the autocorrelation function of the
Baudhayana sequences obtained from the residue classes and we show these
sequences have excellent randomness properties. We provide analytical
explanation for the peak and the average off-peak values for the
autocorrelation function. These sequences can be used specifically in a variety
of key generation and distribution problems and, more generally, as
pseudorandom sequences.


title: Microresonator-Based Comb Generation without an External Laser Source

abstract:
  Recent developments demonstrate that parametric four-wave mixing (FWM) in
high-Q microresonators is a highly promising and effective approach for optical
frequency comb generation, with applications including spectroscopy, optical
clocks, arbitrary waveform generation, frequency metrology, and astronomical
spectrograph calibration. Each of these microresonator platforms utilizes a
scheme in which the system is pumped by a single-frequency laser at a cavity
resonance. This scheme requires tuning of the pump wavelength into resonance
and the generated comb is susceptible to fluctuations in pump power or
frequency which can disrupt the soft thermal lock and comb generation. We
demonstrate a novel fiber-microresonator dual-cavity architecture that
preferentially oscillates at modes of the microresonator due to its high
density of states and generates robust and broadband combs (> 900 nm) without
an external pump laser. Such a scheme could greatly simplify the comb
generation process and allow for a fully-integrated chip-scale source with an
on-chip amplifier.


title:
The influence of numerical resolution on coronal density in hydrodynamic
  models of impulsive heating

abstract:
  The effect of the numerical spatial resolution in models of the solar corona
and corona / chromosphere interface is examined for impulsive heating over a
range of magnitudes using one dimensional hydrodynamic simulations. It is
demonstrated that the principle effect of inadequate resolution is on the
coronal density. An underresolved loop typically has a peak density of at least
a factor of two lower than a resolved loop subject to the same heating, with
larger discrepencies in the decay phase. The temperature for under-resolved
loops is also lower indicating that lack of resolution does not "bottle up" the
heat flux in the corona. Energy is conserved in the models to under 1% in all
cases, indicating that this is not responsible for the low density. Instead, we
argue that in under-resolved loops the heat flux "jumps across" the transition
region to the dense chromosphere from which it is radiated rather than heating
and ablating transition region plasma. This emphasises the point that the
interaction between corona and chromosphere occurs only through the medium of
the transition region. Implications for three dimensional magnetohydrodynamic
coronal models are discussed.


title: The rigid limit of N=2 supergravity

abstract:
  In this paper we review the rigid limit of N=2 supergravity coupled to vector
and hypermultiplets. In particular we show how the respective scalar field
spaces reduce to their global counterparts. In the hypermultiplet sector we
focus on the relation between the local and rigid c-map.


title:
A Theory on the Convective Origins of Active Longitudes on Solar-like
  Stars

abstract:
  Using a thin flux tube model in a rotating spherical shell of turbulent,
solar-like convective flows, we find that the distribution of emerging flux
tubes in our simulation is inhomogeneous in longitude, with properties similar
to those of active longitudes on the Sun and other solar-like stars. The
large-scale pattern of flux emergence our simulations produce exhibits
preferred longitudinal modes of low order, drift with respect to a fixed
reference system, and alignment across the Equator at low latitudes between 15
degrees. We suggest that these active-longitude-like emergence patterns are the
result of columnar, rotationally aligned giant cells present in our convection
simulation at low latitudes. If giant convecting cells exist in the bulk of the
solar convection zone, this phenomenon, along with differential rotation, could
in part provide an explanation for the behavior of active longitudes.


title: Uniqueness of Instantaneously Complete Ricci flows

abstract:
  We prove uniqueness of instantaneously complete Ricci flows on surfaces. We
do not require any bounds of any form on the curvature or its growth at
infinity, nor on the metric or its growth (other than that implied by
instantaneous completeness). Coupled with earlier work, particularly [23, 11],
this completes the well-posedness theory for instantaneously complete Ricci
flows on surfaces.


title: Avoiding Death by Vacuum

abstract:
  The two-Higgs doublet model (2HDM) can have two electroweak breaking,
CP-conserving, minima. The possibility arises that the minimum which
corresponds to the known elementary particle spectrum is metastable, a
possibility we call the "panic vacuum". We present analytical bounds on the
parameters of the softly broken Peccei-Quinn 2HDM which are necessary and
sufficient conditions to avoid this possibility. We also show that, for this
particular model, the current LHC data already tell us that we are necessarily
in the global minimum of the theory, regardless of any cosmological
considerations about the lifetime of the false vacua.


title: Double Field Theory: A Pedagogical Review

abstract:
  Double Field Theory (DFT) is a proposal to incorporate T-duality, a
distinctive symmetry of string theory, as a symmetry of a field theory defined
on a double configuration space. The aim of this review is to provide a
pedagogical presentation of DFT and its applications. We first introduce some
basic ideas on T-duality and supergravity in order to proceed to the
construction of generalized diffeomorphisms and an invariant action on the
double space. Steps towards the construction of a geometry on the double space
are discussed. We then address generalized Scherk-Schwarz compactifications of
DFT and their connection to gauged supergravity and flux compactifications. We
also discuss U-duality extensions, and present a brief parcours on world-sheet
approaches to DFT. Finally, we provide a summary of other developments and
applications that are not discussed in detail in the review.


title:
Improved Numerical Method for Calculation of 4-Body Transition
  Amplitudes

abstract:
  In order to study 4-body atomic collisions such as excitation-ionization,
transfer with target excitation, and double electron capture, the calculation
of a nine-dimensional numerical integral is often required. This calculation
can become computationally expensive, especially when calculating fully
differential cross sections (FDCS), where the positions and momenta of all the
particles are known. We have developed a new technique for calculating FDCS
using fewer computing hours, but more memory. This new technique allows for
much more efficient calculations and the use of many fewer resources.


title: Barium and Yttrium abundance in intermediate-age and old open clusters

abstract:
  Barium is a neutron capture element, that, in open clusters, is frequently
over-abundant with respect to the Iron. A clear explanation for this is still
missing. Additionally, its gradient across the Galactic disk is poorly
constrained. We measure the abundance of yttrium and barium using the synthetic
spectrum method from UVES high-resolution spectra of eight distant open
clusters, namely Ruprecht 4, Ruprecht 7, Berkeley 25, Berkeley 73, Berkeley 75,
NGC 6192, NGC 6404, and NGC 6583. The barium abundance was estimated using NLTE
approximation. We confirm that Barium is indeed over-abundant in most clusters,
especially young clusters. Finally, we investigated the trend of yttrium and
barium abundances as a function of distance in the Galaxy and ages. Several
scenarios for the barium over-abundance are then discussed.


title: Optical properties of cubic and rhombohedral GeTe

abstract:
  Calculations of the optical properties of GeTe in the cubic NaCl and
rhombohedral ferroelectric structures are reported. The rhombohedral
ferroelectric distortion increases the band gap from 0.11 eV to 0.38 eV.
Remarkably, substantial changes in optical properties are found even at high
energies up to 5 eV. The results are discussed in relation to the bonding of
GeTe and to phase change materials based on it.


title:
Apsidal motion in massive close binary systems. I. HD 165052 an extreme
  case?

abstract:
  We present a new set of radial-velocity measurements of the spectroscopic
binary HD 165052 obtained by disentangling of high-resolution optical spectra.
The longitude of the periastron (60 +- 2 degrees) shows a variation with
respect to previous studies. We have determined the apsidal motion rate of the
system (12.1 +- 0.3 degree/yr), which was used to calculate the absolute masses
of the binary components: M_1 = 22.5 +- 1.0 and M_2 = 20.5 +- 0.9 solar masses.
Analysing the separated spectra we have re-classified the components as O7Vz
and O7.5Vz stars.


title: Automated polyp detection in colon capsule endoscopy

abstract:
  Colorectal polyps are important precursors to colon cancer, a major health
problem. Colon capsule endoscopy (CCE) is a safe and minimally invasive
examination procedure, in which the images of the intestine are obtained via
digital cameras on board of a small capsule ingested by a patient. The video
sequence is then analyzed for the presence of polyps. We propose an algorithm
that relieves the labor of a human operator analyzing the frames in the video
sequence. The algorithm acts as a binary classifier, which labels the frame as
either containing polyps or not, based on the geometrical analysis and the
texture content of the frame. The geometrical analysis is based on a
segmentation of an image with the help of a mid-pass filter. The features
extracted by the segmentation procedure are classified according to an
assumption that the polyps are characterized as protrusions that are mostly
round in shape. Thus, we use a best fit ball radius as a decision parameter of
a binary classifier. We present a statistical study of the performance of our
approach on a data set containing over 18,900 frames from the endoscopic video
sequences of five adult patients. The algorithm demonstrates a solid
performance, achieving 47% sensitivity per frame and over 81% sensitivity per
polyp at a specificity level of 90%. On average, with a video sequence length
of 3747 frames, only 367 false positive frames need to be inspected by a human
operator.


title: Sum Rule for the ADM Mass and Tensions in Planar AdS Spacetimes

abstract:
  An asymptotically planar AdS spacetimes is characterized by its ADM mass and
tensions. We define an additional ADM charge Q associated with the scaling
Killing vector of AdS, show that Q is given by a certain sum over the ADM mass
and tensions and that Q vanishes on solutions to the Einstein equation with
negative cosmological constant. The sum rule for the mass and tensions thus
established corresponds in an AdS/CFT context to the vanishing of the trace of
the boundary stress tensor. We also show that an analogous sum rule holds for
local planar sources of stress-energy sources in AdS. In a simple model
consisting of a static, plane symmetric source we find that the perturbative
stress-energy tensor must be tracefree.