title: Two dimensional Leidenfrost Droplets in a Hele Shaw Cell

abstract:
  We experimentally and theoretically investigate the behavior of Leidenfrost
droplets inserted in a Hele-Shaw cell. As a result of the confinement from the
two surfaces, the droplet has the shape of a flattened disc and is thermally
isolated from the surface by the two evaporating vapor layers. An analysis of
the evaporation rate using simple scaling arguments is in agreement with the
experimental results. Using the lubrication approximation we numerically
determine the shape of the droplets as a function of its radius. We furthermore
find that the droplet width tends to zero at its center when the radius reaches
a critical value. This prediction is corroborated experimentally by the direct
observation of the sudden transition from a flattened disc into an expending
torus. Below this critical size, the droplets are also displaying capillary
azimuthal oscillating modes reminiscent of a hydrodynamic instability.


title:
A Numerical Study of Methods for Moist Atmospheric Flows: Compressible
  Equations

abstract:
  We investigate two common numerical techniques for integrating reversible
moist processes in atmospheric flows in the context of solving the fully
compressible Euler equations. The first is a one-step, coupled technique based
on using appropriate invariant variables such that terms resulting from phase
change are eliminated in the governing equations. In the second approach, which
is a two-step scheme, separate transport equations for liquid water and vapor
water are used, and no conversion between water vapor and liquid water is
allowed in the first step, while in the second step a saturation adjustment
procedure is performed that correctly allocates the water into its two phases
based on the Clausius-Clapeyron formula. The numerical techniques we describe
are first validated by comparing to a well-established benchmark problem.
Particular attention is then paid to the effect of changing the time scale at
which the moist variables are adjusted to the saturation requirements in two
different variations of the two-step scheme. This study is motivated by the
fact that when acoustic modes are integrated separately in time (neglecting
phase change related phenomena), or when sound-proof equations are integrated,
the time scale for imposing saturation adjustment is typically much larger than
the numerical one related to the acoustics.


title:
Pr\'evision du risque de cr\'edit : Une \'etude comparative entre
  l'Analyse Discriminante et l'Approche Neuronale

abstract:
  Banks are interested in evaluating the risk of the financial distress before
giving out a loan. Many researchers proposed the use of models based on the
Neural Networks in order to help the banker better make a decision. The
objective of this paper is to explore a new practical way based on the Neural
Networks that would help improve the capacity of the banker to predict the risk
class of the companies asking for a loan. This work is motivated by the
insufficiency of traditional prevision models. The sample consists of 86
Tunisian firms and 15 financial ratios are calculated, over the period from
2005 to 2007. The results are compared with those of discriminant analysis.
They show that the neural networks technique is the best in term of
predictability.


title: Coexistence of bulk superconductivity and ferromagnetism in CeO1-xFxBiS2

abstract:
  We show the observation of the coexistence of bulk superconductivity and
ferromagnetism in CeO1-xFxBiS2(x = 0 - 1.0) prepared by annealing under
high-pressure. In CeO1-xFxBiS2 system, both superconductivity and two types of
ferromagnetism with respective magnetic transition temperatures of 4.5 K and
7.5 K are induced upon systematic F substitution. This fact suggests that
carriers generated by the substitution of O by F are supplied to not only the
BiS2 superconducting layers but also the CeO blocking layers. Furthermore, the
highest superconducting transition temperature is observed when the
ferromagnetism is also enhanced, which implies that superconductivity and
ferromagnetism are linked to each other in the CeO1-xFxBiS2 system.


title:
Quadrant Based DIR in CWin Adaptation Mechanism for Multihop Wireless
  Network

abstract:
  In Multihop Wireless Networks, traffic forwarding capability of each node
varies according to its level of contention. Each node can yield its channel
access opportunity to its neighbouring nodes, so that all the nodes can evenly
share the channel and have similar forwarding capability. In this manner the
wireless channel is utilize d effectively, which is achieved using Contention
Window Adaptation Mechanism (CWAM). This mechanism achieves a higher end to -
end throughout but consumes the network power to a higher level. So, a newly
proposed algorithm Quadrant Based Directional Routing Protocol (Q-DIR) is
implemented as a cross - layer with CWAM, to reduce the total network power
consumption through limited flooding and also reduce the routing overheads,
which eventually increases overall network throughput. This algorithm limits
the broadcast region to a quadrant where the source node and the destination
nodes are located. Implementation of the algorithm is done in Linux based NS-2
simulator.


title:
Experimental observation of moving intrinsic localized modes in
  germanium

abstract:
  Deep level transient spectroscopy shows that defects created by alpha
irradiation of germanium are annealed by low energy plasma ions up to a depth
of several thousand lattice units. The plasma ions have energies of 2-8eV and
therefore can deliver energies of the order of a few eV to the germanium atoms.
The most abundant defect is identified as the E-center, a complex of the dopant
antimony and a vacancy with and annealing energy of 1.3eV as determined by our
measurements. The inductively coupled plasma has a very low density and a very
low flux of ions. This implies that the ion impacts are almost isolated both in
time and at the surface of the semiconductor. We conclude that energy of the
order of an eV is able to travel a large distance in germanium in a localized
way and is delivered to the defects effectively. The most likely candidates are
vibrational nonlinear wave packets known as intrinsic localized modes, which
exist for a limited range of energies. This property is coherent with the fact
that more energetic ions are less efficient at producing the annealing effect.


title: Superconductivity in BiS2-Based Layered Compounds

abstract:
  Crystal structure and physical properties of the novel BiS2-based layered
superconductors are briefly reviewed. Superconductivity in the BiS2-based
layered compounds is induced by electron doping into the BiS2 conduction
layers. The superconducting properties seem to correlate with the crystal
structure. Possible strategies for increasing transition temperature in this
family are discussed.


title:
Thermoconvective structure dynamics in horizontal Homeotropic Nematics
  films heated from above

abstract:
  Homeotropic Nematic Liquid Crystal heated from above present convective
Rayleigh-Benard instability for applied thermal gradients greater than
$\Delta$Tc. This threshold increase with the intensity of applied external
magnetic field parallel to the initial molecular orientation (vertical). We
studied the different patterns which exist near to and away from the threshold,
such as hexagons and squares, and the transitions between them. The study of
patterns evolution away the threshold shows coexistence between patterns and a
global system dynamics. Also we studied how this general dynamics change with
the inclination of the cell, where for very small angles (1 degree) the
hexagons and squares are transformed into rolls.


title: Chemical pressure effect on Tc in BiS2-based Ce1-xNdxO0.5F0.5BiS2

abstract:
  We have investigated the crystal structure and superconducting properties of
the BiS2-based layered superconductor Ce1-xNdxO0.5F0.5BiS2. Bulk
superconductivity was observed for x > 0.3, and the transition temperature was
enhanced with increasing Nd concentration. The highest transition temperature
was 4.8 K for x = 1.0. With increasing Nd concentration, the length of the a
axis decreased, while the length of the c axis did not show a remarkable
change. The chemical pressure along the a axis upon Nd substitution seemed to
be linked with the inducement of bulk superconductivity. We found that the
chemical pressure effect did not completely correspond to the external pressure
effect.


title:
Search for a Stochastic Gravitational-wave Background using a pair of
  Torsion-bar Antennas

abstract:
  We have set a new upper limit on the stochastic gravitational wave background
(SGWB) using two prototype Torsion-bar Antennas (TOBAs). TOBA is a
low-frequency gravitational-wave detector with bar-shaped test masses rotated
by the tidal force of gravitational waves. As a result of simultaneous 7-hour
observations with TOBAs in Tokyo and Kyoto in Japan, our upper limit with a
confidence level of 95% is $\Omega_{\rm gw}h_0^2 < 1.9 \times 10^{17}$ at 0.035
- 0.830 Hz, where $h_{0}$ is the Hubble constant in units of 100 km/s/Mpc and
$\Omega_{\rm gw}$ is the gravitational wave energy density per logarithmic
frequency interval in units of the closure density. We successfully updated the
upper limit and extended the explored frequency band.


title:
Impact of information cost and switching of trading strategies in an
  artificial stock market

abstract:
  This paper studies the switching of trading strategies and its effect on the
market volatility in a continuous double auction market. We describe the
behavior when some uninformed agents, who we call switchers, decide whether or
not to pay for information before they trade. By paying for the information
they behave as informed traders. First we verify that our model is able to
reproduce some of the stylized facts in real financial markets. Next we
consider the relationship between switching and the market volatility under
different structures of investors. We find that there exists a positive
relationship between the market volatility and the percentage of switchers. We
therefore conclude that the switchers are a destabilizing factor in the market.
However, for a given fixed percentage of switchers, the proportion of switchers
that decide to buy information at a given moment of time is negatively related
to the current market volatility. In other words, if more agents pay for
information to know the fundamental value at some time, the market volatility
will be lower. This is because the market price is closer to the fundamental
value due to information diffusion between switchers.


title:
The Superposition Principle in Quantum Mechanics - did the rock enter
  the foundation surreptitiously?

abstract:
  The superposition principle forms the very backbone of quantum theory. The
resulting linear structure of quantum theory is structurally so rigid that
tampering with it may have serious, seemingly unphysical, consequences. This
principle has been succesful at even the highest available accelerator
energies. Is this aspect of quantum theory forever then? The present work is an
attempt to understand the attitude of the founding fathers, particularly of
Bohr and Dirac, towards this principle. The Heisenberg matrix mechanics on the
one hand, and the Schrodinger wave mechanics on the other, are critically
examined to shed light as to how this principle entered the very foundations of
quantum theory.


title:
Data Mining of Online Genealogy Datasets for Revealing Lifespan Patterns
  in Human Population

abstract:
  Online genealogy datasets contain extensive information about millions of
people and their past and present family connections. This vast amount of data
can assist in identifying various patterns in human population. In this study,
we present methods and algorithms which can assist in identifying variations in
lifespan distributions of human population in the past centuries, in detecting
social and genetic features which correlate with human lifespan, and in
constructing predictive models of human lifespan based on various features
which can easily be extracted from genealogy datasets.
  We have evaluated the presented methods and algorithms on a large online
genealogy dataset with over a million profiles and over 9 million connections,
all of which were collected from the WikiTree website. Our findings indicate
that significant but small positive correlations exist between the parents'
lifespan and their children's lifespan. Additionally, we found slightly higher
and significant correlations between the lifespans of spouses. We also
discovered a very small positive and significant correlation between longevity
and reproductive success in males, and a small and significant negative
correlation between longevity and reproductive success in females. Moreover,
our machine learning algorithms presented better than random classification
results in predicting which people who outlive the age of 50 will also outlive
the age of 80.
  We believe that this study will be the first of many studies which utilize
the wealth of data on human populations, existing in online genealogy datasets,
to better understand factors which influence human lifespan. Understanding
these factors can assist scientists in providing solutions for successful
aging.


title:
Ultra-low-loss CMOS-Compatible Waveguide Crossing Arrays Based on
  Multimode Bloch Waves and Imaginary Coupling

abstract:
  We experimentally demonstrate broadband waveguide crossing arrays showing
ultra low loss down to $0.04\,$dB/crossing ($0.9\%$), matching theory, and
crosstalk suppression over $35\,$dB, in a CMOS-compatible geometry. The
principle of operation is the tailored excitation of a low-loss spatial Bloch
wave formed by matching the periodicity of the crossing array to the difference
in propagation constants of the 1$^\text{st}$- and 3$^\text{rd}$-order TE-like
modes of a multimode silicon waveguide. Radiative scattering at the crossing
points acts like a periodic imaginary-permittivity perturbation that couples
two supermodes, which results in imaginary (radiative) propagation-constant
splitting and gives rise to a low-loss, unidirectional breathing Bloch wave.
This type of crossing array provides a robust implementation of a key component
enabling dense photonic integration.


title: Transport coefficients of nuclear matter in neutron star cores

abstract:
  We calculate thermal conductivity and shear viscosity of nucleons in dense
nuclear matter of neutron star cores in the non-relativistic
Brueckner-Hartree-Fock framework. Nucleon-nucleon interaction is described by
the Argonne v18 potential with addition of the Urbana IX effective three-body
forces. We find that this three body force leads to decrease of the kinetic
coefficients with respect to the two-body case. The results of calculations are
compared with electron and muon transport coefficients as well as with the
results of other authors.


title: The nucleation of false vacuum bubbles with compact geometries

abstract:
  We investigate and classify the possible types of false vacuum bubbles in
Einstein gravity. The false vacuum bubbles can occur only if gravity is taken
into account. We show that there exist solutions only with compact geometries.
The analytic computations for the radius and nucleation rate of a vacuum bubble
are evaluated using the thin-wall approximation. We discuss possible
cosmological implications of our new solutions.


title: A little more Gauge Mediation and the light Higgs mass

abstract:
  We consider minimal models of gauge mediated supersymmetry breaking with an
extra $U(1)$ factor in addition to the Standard Model gauge group. A $U(1)$
charged, Standard Model singlet is assumed to be present which allows for an
additional NMSSM like coupling, $\lambda H_u H_d S$. The U(1) is assumed to be
flavour universal. Anomaly cancellation in the MSSM sector requires additional
coloured degrees of freedom. The $S$ field can get a large vacuum expectation
value along with consistent electroweak symmetry breaking. It is shown that the
lightest CP even Higgs boson can attain mass of the order of 125 GeV.


title:
The gluing formula of the zeta-determinants of Dirac Laplacians for
  certain boundary conditions

abstract:
  The odd signature operator is a Dirac operator which acts on the space of
differential forms of all degrees and whose square is the usual Laplacian. We
extend the result of [15] to prove the gluing formula of the zeta-determinants
of Laplacians acting on differential forms of all degrees with respect to the
boundary conditions ${\mathcal P}_{-, {\mathcal L}_{0}}$, ${\mathcal P}_{+,
{\mathcal L}_{1}}$. We next consider a double of de Rham complexes consisting
of differential forms of all degrees with the absolute and relative boundary
conditions. Using a similar method, we prove the gluing formula of the
zeta-determinants of Laplacians acting on differential forms of all degrees
with respect to the absolute and relative boundary conditions.


title:
Uniform Positivity and Continuity of Lyapunov Exponents for a Class of
  $C^2$ Quasiperiodic Schr\"odinger Cocycles

abstract:
  We show that for a class of $C^2$ quasiperiodic potentials and for any
Diophantine frequency, the Lyapunov exponents of the corresponding
Schr\"odinger cocycles are uniformly positive and weak H\"older continuous as
function of energies. As a corollary, we also obtain that the corresponding
integrated density of states (IDS) is weak H\"older continous. Our approach is
of purely dynamical systems, which depends on a detailed analysis of asymptotic
stable and unstable directions. We also apply it to more general
$\mathrm{SL}(2,\mathbb R)$ cocycles, which in turn can be applied to get
uniform positivity and continuity of Lyapuonv exponents around unique
nondegenerate extremal points of any smooth potential, and to a certain class
of $C^2$ Szeg\H o cocycles.


title: Principal Component Analysis of Cavity Beam Position Monitor Signals

abstract:
  Model-independent analysis (MIA) methods are generally useful for analysing
complex systems in which relationships between the observables are non-trivial
and noise is present. Principle Component Analysis (PCA) is one of MIA methods
allowing to isolate components in the input data graded to their contribution
to the variability of the data. In this publication we show how the PCA can be
applied to digitised signals obtained from a cavity beam position monitor
(CBPM) system on the example of a 3-cavity test system installed at the
Accelerator Test Facility 2 (ATF2) at KEK in Japan. We demonstrate that the PCA
based method can be used to extract beam position information, and matches
conventional techniques in terms of performance, while requiring considerably
less settings and data for calibration.


title:
Simulating Anderson localization via a quantum walk on a one-dimensional
  lattice of superconducting qubits

abstract:
  Quantum walk (QW) in presence of lattice disorders leads to a multitude of
interesting phenomena, such as Anderson localization. While QW has been
realized in various optical and atomic systems, its implementation with
superconducting qubits still remains pending. The major challenge in simulating
QW with superconducting qubits emerges from the fact that on-chip
superconducting qubits cannot hop between two adjacent lattice sites. Here we
overcome this barrier and develop a scheme to realize the discrete time QW by
placing a pair of superconducting qubits on each site of a 1D lattice and
treating an excitation as a walker. It is also shown that lattice disorders can
be introduced and fully controlled within this scheme by tuning the qubit
parameters. We observe a distinct signature of transition from the ballistic
regime to a localized QW with an increasing strength of disorder. Finally, an
eight-qubit experiment is proposed where the signature of localized and
delocalized regimes can be detected with existing superconducting technology.


title:
The Link Between Ejected Stars, Hardening and Eccentricity Growth of
  Super Massive Black Holes in Galactic Nuclei

abstract:
  The hierarchical galaxy formation picture suggests that super massive black
holes (MBHs) observed in galactic nuclei today have grown from coalescence of
massive black hole binaries (MBHB) after galaxy merging. Once the components of
a MBHB become gravitationally bound, strong three-body encounters between the
MBHB and stars dominate its evolution in a "dry" gas free environment, and
change the MBHB's energy and angular momentum (semi-major axis, eccentricity
and orientation). Here we present high accuracy direct N-body simulations of
spherical and axisymmetric (rotating) galactic nuclei with order a million
stars and two massive black holes that are initially unbound. We analyze the
properties of the ejected stars due to slingshot effects from three-body
encounters with the MBHB in detail. Previous studies have investigated the
eccentricity and energy changes of MBHs using approximate models or Monte-Carlo
three body scatterings. We find general agreement with the average results of
previous semi-analytic models for spherical galactic nuclei, but our results
show a large statistical variation. Our new results show many more phase space
details of how the process works, and also show the influence of stellar system
rotation on the process. We detect that the angle between the orbital plane of
the MBHBs and that of the stellar system (when it rotates) influences the
phase-space properties of the ejected stars. We also find that massive MBHB
tend to switch stars with counter-rotating orbits into co-rotating orbits
during their interactions.


title: Angular averaged consistency relations of large-scale structures

abstract:
  The cosmological dynamics of gravitational clustering satisfies an
approximate invariance with respect to the cosmological parameters that is
often used to simplify analytical computations. We describe how this
approximate symmetry gives rise to angular averaged consistency relations for
the matter density correlations. This allows one to write the $(\ell+n)$
density correlation, with $\ell$ large-scale linear wave numbers that are
integrated over angles, and $n$ fixed small-scale nonlinear wave numbers, in
terms of the small-scale $n$-point density correlation and $\ell$ prefactors
that involve the linear power spectra at the large-scale wave numbers. These
relations, which do not vanish for equal-time statistics, go beyond the already
known kinematic consistency relations. They could be used to detect primordial
non-Gaussianities, modifications of gravity, limitations of galaxy biasing
schemes, or to help designing analytical models of gravitational clustering.


title: On chiral symmetry in extended nonlinear supersymmetry

abstract:
  We study the equations of the motion for Nambu-Goldstone (NG) fermions in the
nonlinear representation of supersymmetry (NLSUSY) and show in N-extended
NLSUSY that those equations under massless conditions are satisfied, provided
the NG fermions are chiral eigenstates. The physical significance of the result
is discussed in the context of NLSUSY general relativity through the relations
between nonlinear and linear SUSY theories, which gives a new insight into the
chiral symmetry for the low energy particle physics.


title: An Overview of the Square Kilometre Array

abstract:
  The Square Kilometre Array (SKA) will be the premier instrument to study
radiation at centimetre and metre wavelengths from the cosmos, and in
particular hydrogen, the most abundant element in the universe. The SKA will
probe the dawn of galaxy formation as well as allow advances in many other
areas of astronomy, such as fundamental physics, astrobiology and cosmology.
Phase 1, which will be about 10% of the full SKA collecting area, will be built
in Australia and South Africa. This paper describes the key science drivers of
the SKA, provides an update on recent SKA Organisation activities and
summarises the baseline design for Phase 1.


title: Simulating Parity Reasoning (extended version)

abstract:
  Propositional satisfiability (SAT) solvers, which typically operate using
conjunctive normal form (CNF), have been successfully applied in many domains.
However, in some application areas such as circuit verification, bounded model
checking, and logical cryptanalysis, instances can have many parity (xor)
constraints which may not be handled efficiently if translated to CNF. Thus,
extensions to the CNF-driven search with various parity reasoning engines
ranging from equivalence reasoning to incremental Gaussian elimination have
been proposed. This paper studies how stronger parity reasoning techniques in
the DPLL(XOR) framework can be simulated by simpler systems: resolution, unit
propagation, and parity explanations. Such simulations are interesting, for
example, for developing the next generation SAT solvers capable of handling
parity constraints efficiently.


title:
Study on Antibody-Virus Interaction using Molecular Dynamics: Two
  Dimensional Simulation on Immunoglobulin Reaction against Human
  Papillomavirus

abstract:
  Human Papillomavirus (HPV) has been known as one of the cause of
virus-induced cancer such as cervical cancer and carcinoma. Among other types
of cancer, this type has higher chance in being prevented earlier. The main
idea is to eradicate the virus as soon as it enters the body by marking it with
antibodies; signaling the immune system to dispose of it. However, the
antibodies must be trained to recognize the virus. They can be trained by
inserting an object similar to the virus allowing them to learn to recognize
and surround the inserted object. In response to this, molecular dynamics
simulation was chosen to study the antibody-virus interaction. In this work,
two-dimensional case that involves HPV and immunoglobulin (Ig) was studied and
observed. Two types of objects will be defined; one stands for HPV while
another stands for antibodies. The interaction between the two objects will be
governed by two forces; Coulomb force and repulsive contact force. Through the
definition of some rules and condition, the antibodies' motion was observed.
The influence of antibody concentration, and the antibody's type and their
appearance sequence were observed both quantitatively and visually.
  Keywords: antibody-virus interaction, molecular dynamics, HPV,
immunoglobulin.


title: Minimum $n$-Rank Approximation via Iterative Hard Thresholding

abstract:
  The problem of recovering a low $n$-rank tensor is an extension of sparse
recovery problem from the low dimensional space (matrix space) to the high
dimensional space (tensor space) and has many applications in computer vision
and graphics such as image inpainting and video inpainting. In this paper, we
consider a new tensor recovery model, named as minimum $n$-rank approximation
(MnRA), and propose an appropriate iterative hard thresholding algorithm with
giving the upper bound of the $n$-rank in advance. The convergence analysis of
the proposed algorithm is also presented. Particularly, we show that for the
noiseless case, the linear convergence with rate $\frac{1}{2}$ can be obtained
for the proposed algorithm under proper conditions. Additionally, combining an
effective heuristic for determining $n$-rank, we can also apply the proposed
algorithm to solve MnRA when $n$-rank is unknown in advance. Some preliminary
numerical results on randomly generated and real low $n$-rank tensor completion
problems are reported, which show the efficiency of the proposed algorithms.


title:
A new approach to the two-dimensional $\sigma$-model with a topological
  charge

abstract:
  Based on character decomposition, a dual transformation is introduced leading
to two formulations of the theory which should allow for a removal/softening of
the sign problem in the original version. Very preliminar numerical results are
commented and remaining problems discussed.


title:
Scalable Oriented-Service Architecture for Heterogeneous and Ubiquitous
  IoT Domains

abstract:
  Internet of Things (IoT) grows quickly, and 50 billion of IoT devices will be
interconnected by 2020. For the huge number of IoT devices, a high scalable
discovery architecture is required to provide autonomous registration and
look-up of IoT resources and services. The architecture should enable dynamic
updates when new IoT devices are incorporated into Internet, and changes are
made to the existing ones. Nowadays in Internet, the most used discovery
architecture is the Domain Name System (DNS). DNS offers a scalable solution
through two distributed mechanisms: multicast DNS (mDNS) and DNS Service
Directory (DNS-SD). Both mechanisms have been applied to discover resources and
services in local IoT domains. However, a full architecture has not still been
designed to support global discovery, local directories and a search engine for
ubiquitous IoT domains. Moreover, the architecture should provide other
transversal functionalities such as a common semantic for describing services
and resources, and a service layer for interconnecting with M2M platforms and
mobile clients. This paper presents an oriented-service architecture based on
DNS to support a global discovery, local directories and a distributed search
engine to enable a scalable looking-up of IoT resources and services. The
architecture provides two lightweight discovery mechanisms based on mDNS and
DNS-SD that have been optimized for the constraints of IoT devices to allow
autonomous registration. Moreover, we analyse and provide other relevant
elements such semantic description and communications interfaces to support the
heterogeneity of IoT devices and clients. All these elements contribute to
build a scalable architecture for the discovery and access of heterogeneous and
ubiquitous IoT domains.


title:
Exponential Approximation of Bandlimited Functions from Average
  Oversampling

abstract:
  Weighted average sampling is more practical and numerically more stable than
sampling at single points as in the classical Shannon sampling framework. Using
the frame theory, one can completely reconstruct a bandlimited function from
its suitably-chosen average sample data. When only finitely many sample data
are available, truncating the complete reconstruction series with the standard
dual frame results in very slow convergence. We present in this note a method
of reconstructing a bandlimited function from finite average oversampling with
an exponentially-decaying approximation error.


title:
Manipulation of the nuclear spin ensemble in a quantum dot with chirped
  magnetic resonance pulses

abstract:
  The nuclear spins in nanostructured semiconductors play a central role in
quantum applications. The nuclear spins represent a useful resource for
generating local magnetic fields but nuclear spin noise represents a major
source of dephasing for spin qubits. Controlling the nuclear spins enhances the
resource while suppressing the noise. NMR techniques are challenging: the group
III and V isotopes have large spins with widely different gyromagnetic ratios;
in strained material there are large atom-dependent quadrupole shifts; and
nanoscale NMR is hard to detect. We report NMR on 100,000 nuclear spins of a
quantum dot using chirped radiofrequency pulses. Following polarization, we
demonstrate a reversal of the nuclear spin. We can flip the nuclear spin back
and forth a hundred times.We demonstrate that chirped NMR is a powerful way of
determining the chemical composition, the initial nuclear spin temperatures and
quadrupole frequency distributions for all the main isotopes. The key
observation is a plateau in the NMR signal as a function of sweep rate: we
achieve inversion at the first quantum transition for all isotopes
simultaneously. These experiments represent a generic technique for
manipulating nanoscale inhomogeneous nuclear spin ensembles and open the way to
probe the coherence of such mesoscopic systems.


title: Reflection methods for user-friendly submodular optimization

abstract:
  Recently, it has become evident that submodularity naturally captures widely
occurring concepts in machine learning, signal processing and computer vision.
Consequently, there is need for efficient optimization procedures for
submodular functions, especially for minimization problems. While general
submodular minimization is challenging, we propose a new method that exploits
existing decomposability of submodular functions. In contrast to previous
approaches, our method is neither approximate, nor impractical, nor does it
need any cumbersome parameter tuning. Moreover, it is easy to implement and
parallelize. A key component of our method is a formulation of the discrete
submodular minimization problem as a continuous best approximation problem that
is solved through a sequence of reflections, and its solution can be easily
thresholded to obtain an optimal discrete solution. This method solves both the
continuous and discrete formulations of the problem, and therefore has
applications in learning, inference, and reconstruction. In our experiments, we
illustrate the benefits of our method on two image segmentation tasks.


title: On generalization of reversible second-order cellular automata

abstract:
  A cellular automaton with $n$ states may be used for construction of
reversible second-order cellular automaton with $n^2$ states. Reversible
cellular automata with hidden parameters discussed in this paper are
generalization of such construction and may have number of states $N=n m$ with
arbitrary $m$. Further modification produces reversible cellular automata with
reduced number of states $N' < N = n m$.


title:
Searching for companions down to 2 AU from beta Pictoris using the
  L'-band AGPM coronagraph on VLT/NACO

abstract:
  Context. The orbit of the giant planet discovered around beta Pic is slightly
inclined with respect to the outer parts of the debris disc, which creates a
warp in the inner debris disc. This inclination might be explained by
gravitational interactions with other planets. Aims. We aim to search for
additional giant planets located at smaller angular separations from the star.
Methods. We used the new L'-band AGPM coronagraph on VLT/NACO, which provides
an exquisite inner working angle. A long observing sequence was obtained on
beta Pic in pupil-tracking mode. To derive sensitivity limits, the collected
images were processed using a principal-component analysis technique
specifically tailored to angular differential imaging. Results. No additional
planet is detected down to an angular separation of 0.2" with a sensitivity
better than 5 MJup. Meaningful upper limits (< 10 MJup) are derived down to an
angular separation of 0.1", which corresponds to 2 AU at the distance of beta
Pic.


title: Nanostructured optical nanofibres for atom trapping

abstract:
  We propose an optical dipole trap for cold neutral atoms based on the
electric field produced from the evanescent fields in a hollow rectangular slot
cut through an optical nanofibre. In particular, we discuss the trap
performance in relation to laser-cooled rubidium atoms and show that a far
off-resonance, blue-detuned field combined with the attractive surface-atom
interaction potential from the dielectric material forms a stable trapping
configuration. With the addition of a red-detuned field, we demonstrate how
three dimensional confinement of the atoms at a distance of 140 - 200 nm from
the fibre surface within the slot can be accomplished. This scheme facilitates
optical coupling between the atoms and the nanofibre that could be exploited
for quantum communication schemes using ensembles of laser-cooled atoms.


title:
A MALT90 study of the chemical properties of massive clumps and
  filaments of infrared dark clouds

abstract:
  We attempt to characterise the chemical properties of a sample of massive
clumps of IRDCs through multi-molecular line observations. We also search for
possible evolutionary trends among the derived chemical parameters. The clumps
are studied using the MALT90 line survey data obtained with the Mopra
telescope. The spectral-line data are used in concert with our previous LABOCA
870-$\mu$m dust emission data. Most of the detected species (SiO, C$_2$H, HNCO,
HCN, HCO$^+$, HNC, HC$_3$N, and N$_2$H$^+$) show spatially extended emission
towards many of the sources. The fractional abundances of the molecules are
mostly found to be comparable to those determined in other recent similar
studies of IRDC clumps. We found that the abundances of SiO, HNCO, and HCO$^+$
are higher in IR-bright clumps than in IR-dark sources, reflecting a possible
evolutionary trend. A hint of such a trend is also seen for HNC and HC$_3$N. An
opposite trend is seen for C$_2$H and N$_2$H$^+$. Moreover, a positive
correlation is found between the abundances of HCO$^+$ and HNC, and between
those of HNC and HCN. The HCN and HNC abundances also appear to increase as a
function of the N$_2$H$^+$ abundance. The HNC/HCN and N$_2$H$^+$/HNC abundance
ratios are derived to be ~1 on average, while that of HC$_3$N/HCN is ~10%. The
N$_2$H$^+$/HNC ratio appears to increase as the clump evolves, while the
HNC/HCO$^+$ ratio shows the opposite behaviour. The detected SiO emission is
likely caused by outflow shocks in most cases, although shocks resulting from
the cloud formation process could also play a role. Shock-origin for the HNCO,
HC$_3$N, and CH$_3$CN emission is also plausible. The average HNC/HCN ratio is
in good agreement with those seen in other IRDCs. Our results support the
finding that C$_2$H can trace the cold gas, and not just the PDRs. The
HC$_3$N/HCN ratio appears to be comparable to that in T Tauri disks and comets.


title: Gravity as an emergent phenomenon: experimental signatures

abstract:
  According to some authors, gravity might be an emergent phenomenon in a
fundamentally flat space-time. In this case the speed of light in the vacuum
would not coincide exactly with the basic parameter "c" entering Lorentz
transformations and, for an apparatus placed on the Earth's surface, light
should exhibit a tiny fractional anisotropy at the level 10^{-15}. We argue
that, most probably, this effect is now observed in many room-temperature
ether-drift experiments and, in particular, in a very precise cryogenic
experiment where this level of signal is about 100 times larger than the
designed short-term stability. To fully appreciate what is going on, however,
one should consider the vacuum as a true physical medium whose fundamental
quantum nature gives rise to the irregular, non-deterministic pattern which
characterizes the observed signal.


title:
Assembly-mediated Interplay of Dipolar Interactions and Surface Spin
  Disorder in Colloidal Maghemite Nanoclusters

abstract:
  Controlled assembly of single-crystal, colloidal maghemite nanoparticles is
facilitated via a high-temperature polyol-based pathway. Structural
characterization shows that size-tunable nanoclusters of 50 and 86 nm diameters
(D), with high dispersibility in aqueous media, are composed of $\sim$ 13 nm
(d) crystallographically oriented nanoparticles. The interaction effects are
examined against the increasing volume fraction, $\phi$, of the inorganic
magnetic phase that goes from individual colloidal nanoparticles ($\phi$= 0.47)
to clusters ($\phi$= 0.72). The frozen-liquid dispersions of the latter exhibit
weak ferrimagnetic behavior at 300 K. Comparative Mossbauer spectroscopic
studies imply that intra-cluster interactions come into play. A new insight
emerges from the clusters temperature-dependent ac susceptibility that displays
two maxima in $\chi$''(T), with strong frequency dispersion. Scaling-law
analysis, together with the observed memory effects suggest that a superspin
glass state settles-in at T$_{B}$ $\sim$ 160-200 K, while at
lower-temperatures, surface spin-glass freezing is established at T$_{f}$
$\sim$40- 70 K. In such nanoparticle-assembled systems, with increased $\phi$,
Monte Carlo simulations corroborate the role of the inter-particle dipolar
interactions and that of the constituent nanoparticles surface spin disorder in
the emerging spin-glass dynamics.


title:
Applying Formal Methods to Networking: Theory, Techniques and
  Applications

abstract:
  Despite its great importance, modern network infrastructure is remarkable for
the lack of rigor in its engineering. The Internet which began as a research
experiment was never designed to handle the users and applications it hosts
today. The lack of formalization of the Internet architecture meant limited
abstractions and modularity, especially for the control and management planes,
thus requiring for every new need a new protocol built from scratch. This led
to an unwieldy ossified Internet architecture resistant to any attempts at
formal verification, and an Internet culture where expediency and pragmatism
are favored over formal correctness. Fortunately, recent work in the space of
clean slate Internet design---especially, the software defined networking (SDN)
paradigm---offers the Internet community another chance to develop the right
kind of architecture and abstractions. This has also led to a great resurgence
in interest of applying formal methods to specification, verification, and
synthesis of networking protocols and applications. In this paper, we present a
self-contained tutorial of the formidable amount of work that has been done in
formal methods, and present a survey of its applications to networking.


title:
Finite-Temperature Spectral Functions from the Functional
  Renormalization Group

abstract:
  We present a method to obtain spectral functions at finite temperature from
the Functional Renormalization Group. Our method is based on a
thermodynamically consistent truncation of the flow equations for 2-point
functions with analytically continued frequency components in the originally
Euclidean external momenta. For the uniqueness of this continuation at finite
temperature we furthermore implement the physical Baym-Mermin boundary
conditions. Results are presented for mesonic spectral functions obtained from
a two-flavor quark-meson model.


title: Checking Race Freedom of Clocked X10 Programs

abstract:
  One of many approaches to better take advantage of parallelism, which has now
become mainstream, is the introduction of parallel programming languages.
However, parallelism is by nature non-deterministic, and not all parallel bugs
can be avoided by language design. This paper proposes a method for
guaranteeing absence of data races in the polyhedral subset of clocked X10
programs.
  Clocks in X10 are similar to barriers, but are more dynamic; the subset of
processes that participate in the synchronization can dynamically change at
runtime. We construct the happens-before relation for clocked X10 programs, and
show that the problem of race detection is undecidable. However, in many
practical cases, modern tools are able to find solutions or disprove their
existence. We present a set of benchmarks for which the analysis is possible
and has an acceptable running time.


title:
Distributed bounded-error state estimation for partitioned systems based
  on practical robust positive invariance

abstract:
  We propose a partition-based state estimator for linear discrete-time systems
composed by coupled subsystems affected by bounded disturbances. The
architecture is distributed in the sense that each subsystem is equipped with a
local state estimator that exploits suitable pieces of information from parent
subsystems. Moreover, differently from methods based on moving horizon
estimation, our approach does not require the on-line solution to optimization
problems. Our state-estimation scheme, that is based on the notion of practical
robust positive invariance developed in Rakovic 2011, also guarantees
satisfaction of constraints on local estimation errors and it can be updated
with a limited computational effort when subsystems are added or removed.


title: 't Hooft loop and the phases of SU(2) LGT

abstract:
  We analyze the vacuum structure of SU(2) lattice gauge theories in D=2,3,4,
concentrating on the stability of 't Hooft loops. High precision calculations
have been performed in D=3; similar results hold also for D=4 and D=2. We
discuss the impact of our findings on the continuum limit of Yang-Mills
theories.


title:
On the order of vertex-stabilisers in vertex-transitive graphs with
  local group $C_p\times C_p$ or $C_p \wr C_2$

abstract:
  Let $p$ be a prime and let $L$ be either the intransitive permutation group
$C_p\times C_p$ of degree $2p$ or the transitive permutation group $C_p \wr
C_2$ of degree $2p$. Let $\Gamma$ be a connected $G$-vertex-transitive and
$G$-edge-transitive graph and let $v$ be a vertex of $\Gamma$. We show that if
the permutation group induced by the vertex-stabiliser $G_v$ on the
neighbourhood $\Gamma(v)$ is isomorphic to $L$ then either $|V(\Gamma)|\geq
p|G_v|\log_p\left(|G_v|/2\right)$, or $|V(\Gamma)|$ is bounded by a constant
depending only on $p$, or $\Gamma$ is a very-well understood graph. This
generalises a few recent results.


title:
Geometry of the inversion in a finite field and partitions of
  ${\mathrm{PG}}(2^k-1,q)$ in normal rational curves

abstract:
  Let $L=\mathbb F_{q^n}$ be a finite field and let $F=\mathbb F_q$ be a
subfield of $L$.
  Consider $L$ as a vector space over $F$ and the associated projective space
that is isomorphic to ${\mathrm{PG}}(n-1,q)$.
  The properties of the projective mapping induced by $x\mapsto x^{-1}$ have
been studied in \cite{Cs13,Fa02,Ha83,He85,Bu95}, where it is proved that the
image of any line is a normal rational curve in some subspace.
  In this note a more detailed geometric description is achieved.
  Consequences are found related to mixed partitions of the projective spaces;
in particular, it is proved that for any positive integer $k$, if $q\ge2^k-1$,
then there are partitions of ${\mathrm{PG}}(2^k-1,q)$ in normal rational curves
of degree $2^k-1$.
  For smaller $q$ the same construction gives partitions in $(q+1)$-tuples of
independent points.


title:
Achievable Rate Region of the Bidirectional Buffer-Aided Relay Channel
  with Block Fading

abstract:
  The bidirectional relay channel, in which two users communicate with each
other through a relay node, is a simple but fundamental and practical network
architecture. In this paper, we consider the block fading bidirectional relay
channel and propose efficient transmission strategies that exploit the block
fading property of the channel. Thereby, we consider a decode-and-forward relay
and assume that a direct link between the two users is not present. Our aim is
to characterize the long-term achievable rate region and to develop protocols
which achieve all points of the obtained rate region. Specifically, in the
bidirectional relay channel, there exist six possible transmission modes: four
point-to-point modes (user 1-to-relay, user 2-to-relay, relay-to-user 1,
relay-to-user 2), a multiple-access mode (both users to the relay), and a
broadcast mode (the relay to both users). Most existing protocols assume a
fixed schedule for using a subset of the aforementioned transmission modes.
Motivated by this limitation, we develop protocols which are not restricted to
adhere to a predefined schedule for using the transmission modes. In fact,
based on the instantaneous channel state information (CSI) of the involved
links, the proposed protocol selects the optimal transmission mode in each time
slot to maximize the long-term achievable rate region. Thereby, we consider two
different types of transmit power constraints: 1) a joint long-term power
constraint for all nodes, and 2) a fixed transmit power for each node.
Furthermore, to enable the use of a non-predefined schedule for transmission
mode selection, the relay has to be equipped with two buffers for storage of
the information received from both users. As data buffering increases the
end-to-end delay, we consider both delay-unconstrained and delay-constrained
transmission in the paper.


title:
The 30-band k.p modeling of electron and hole states in silicon quantum
  wells

abstract:
  We modeled the electron and hole states in Si/SiO2 quantum wells within a
basis of standing waves using the 30-band k.p theory. The hard-wall confinement
potential is assumed, and the influence of the peculiar band structure of bulk
silicon on the quantum-well sub-bands is explored. Numerous spurious solutions
in the conduction-band and valence-band energy spectra are found and are
identified to be of two types: (1) spurious states which have large
contributions of the bulk solutions with large wave-vectors (the high-k
spurious solutions) and (2) states which originate mainly from the spurious
valley outside the Brillouin zone (the extra-valley spurious solutions). An
algorithm to remove all those nonphysical solutions from the electron and hole
energy spectra is proposed. Furthermore, slow and oscillatory convergence of
the hole energy levels with the number of basis functions is found and is
explained by the peculiar band mixing and the confinement in the considered
quantum well. We discovered that assuming the hard-wall potential leads to
numerical instability of the hole states computation. Nonetheless, allowing the
envelope functions to exponentially decay in a barrier of finite height is
found to improve the accuracy of the computed hole states.


title:
Low-frequency Noise in Individual Carbon Nanotube Field-Effect
  Transistors with Top, Side and Back Gate Configurations: Effect of Gamma
  Irradiation

abstract:
  We report on the influence of low gamma irradiation (10^4 Gy) on the noise
properties of individual carbon nanotube (CNT) field-effect transistors (FETs)
with different gate configurations and two different dielectric layers, SiO2
and Al2O3. Before treatment, strong generation-recombination (GR) noise
components are observed. These data are used to identify several charge traps
related to dielectric layers of the FETs by determining their activation
energy. Investigation of samples with a single SiO2 dielectric layer as well as
with two dielectric layers allows us to separate traps for each of the two
dielectric layers. We reveal that each charge trap level observed in the side
gate operation splits into two levels in top gate operation due to a different
potential profile along the CNT channel. After gamma irradiation, only reduced
flicker noise is registered in the noise spectra, which indicates a decrease of
the number of charge traps. The mobility, which is estimated to be larger than
2x10^4 cm2V-1s-1 at room temperature, decreases only slightly after radiation
treatment demonstrating high radiation hardness of the CNTs. Finally, we study
the influence of Schottky barriers at the metal-nanotube interface on the
transport properties of FETs analyzing the behavior of the flicker noise
component.


title: Gamma-ray burst polarization via Compton scattering process

abstract:
  Synchrotron radiation and Compton scattering are widely accepted as the most
likely emission mechanisms of some astrophysical phenomena, such as gamma-ray
bursts (GRBs) and active galactic nuclei (AGNs). The measurement on
polarization of photons provides a useful tool to distinguish different
emission mechanisms and structures of the emission region. Based on the
differential cross section of a polarized photon scattered by an unpolarized
electron of any initial momentum, we derive analytical formula of polarization
for beamed photons scattered by isotropic electrons with a power law
distribution. Numerical calculations are carried out in four special cases:
electrons at rest, Thomson limit, head-on collision and monochromatic
electrons. It is found that the maximum polarization can be as high as $100\%$
for low energy photons, if the electrons are at rest. Although polarization is
highly suppressed due to the isotropic electrons, a maximum value of $\sim 10\%
\-- 20\%$ can still be achieved. Compton scattering process can be used to
explain the polarization of GRB 041219A and GRB 100826A.


title:
On the Fitting height of soluble groups admitting a coprime
  factorisation

abstract:
  In this paper we are concerned with finite soluble groups $G$ admitting a
factorisation $G=AB$, with $A$ and $B$ proper subgroups having coprime order.
We are interested in bounding the Fitting height of $G$ in terms of some
group-invariants of $A$ and $B$: including the Fitting heights and the derived
lengths.


title:
Purely nonlinear disorder-induced localizations and their parametric
  amplification

abstract:
  We investigate spatial localization in a quadratic nonlinear medium in the
presence of randomness. By means of numerical simulations and theoretical
analyses we show that, in the down conversion regime, the transverse random
modulation of the nonlinear susceptibility generates localizations of the
fundamental wave that grow exponentially in propagation. The localization
length is optically controlled by the pump intensity which determines the
amplification rate. The results also apply to cubic nonlinearities.


title: Varieties with vanishing holomorphic Euler characteristic II

abstract:
  We continue our study on smooth complex projective varieties $X$ of maximal
Albanese dimension and of general type satisfying $\chi(X, \omega_X)=0$. We
formulate a conjectural characterization of such varieties and prove this
conjecture when the Albanese variety has only three simple factors.


title:
Mobile Multimedia Streaming Techniques : QoE and Energy Consumption
  Perspective

abstract:
  Multimedia streaming to mobile devices is challenging for two reasons. First,
the way content is delivered to a client must ensure that the user does not
experience a long initial playback delay or a distorted playback in the middle
of a streaming session. Second, multimedia streaming applications are among the
most energy hungry applications in smartphones. The energy consumption mostly
depends on the delivery techniques and on the power management techniques of
wireless access technologies (Wi-Fi, 3G, and 4G). In order to provide insights
on what kind of streaming techniques exist, how they work on different mobile
platforms, their efforts in providing smooth quality of experience, and their
impact on energy consumption of mobile phones, we did a large set of active
measurements with several smartphones having both Wi-Fi and cellular network
access. Our analysis reveals five different techniques to deliver the content
to the video players. The selection of a technique depends on the mobile
platform, device, player, quality, and service. The results from our traffic
and power measurements allow us to conclude that none of the identified
techniques is optimal because they take none of the following facts into
account: access technology used, user behavior, and user preferences concerning
data waste. We point out the technique with optimal playback buffer
configuration, which provides the most attractive trade-offs in particular
situations.


title: Fabrication, properties, and applications of flexible magnetic films

abstract:
  Flexible magnetic devices, i.e., magnetic devices fabricated on flexible
substrates, are very attractive in application of detecting magnetic field in
arbitrary surface, non-contact actuators, and microwave devices due to the
stretchable, biocompatible, light-weight, portable, and low cost properties.
Flexible magnetic films are essential for the realization of various
functionalities of flexible magnetic devices. To give a comprehensive
understanding for flexible magnetic films and related devices, we have reviewed
recent advances in the studies of flexible magnetic films including fabrication
methods, magnetic and transport properties of flexible magnetic films, and
their applications in magnetic sensors, actuators, and microwave devices. Three
typical methods were introduced to prepare the flexible magnetic films.
Stretching or bending the flexible magnetic films offers a good way to apply
mechanical strain on magnetic films, so that magnetic anisotropy, exchanged
bias, coercivity, and magnetoresistance can be effectively manipulated.
Finally, a series of examples were shown to demonstrate the great potential of
flexible magnetic films for future applications.


title: Ranking Algorithms by Performance

abstract:
  A common way of doing algorithm selection is to train a machine learning
model and predict the best algorithm from a portfolio to solve a particular
problem. While this method has been highly successful, choosing only a single
algorithm has inherent limitations -- if the choice was bad, no remedial action
can be taken and parallelism cannot be exploited, to name but a few problems.
In this paper, we investigate how to predict the ranking of the portfolio
algorithms on a particular problem. This information can be used to choose the
single best algorithm, but also to allocate resources to the algorithms
according to their rank. We evaluate a range of approaches to predict the
ranking of a set of algorithms on a problem. We furthermore introduce a
framework for categorizing ranking predictions that allows to judge the
expressiveness of the predictive output. Our experimental evaluation
demonstrates on a range of data sets from the literature that it is beneficial
to consider the relationship between algorithms when predicting rankings. We
furthermore show that relatively naive approaches deliver rankings of good
quality already.


title: What Powers the Most Relativistic Jets? I: BL Lacs

abstract:
  The dramatic relativistic jets pointing directly at us in BL Lac objects can
be well modelled by bulk motion beaming of synchrotron self-Compton emission
powered by a low Eddington fraction accretion flow. Nearly 500 of these AGN are
seen in the 2nd Fermi Large Area Telescope catalogue of AGN. We combine the jet
models which describe individual spectra with the expected jet parameter
scalings with mass and mass accretion rate to predict the expected number of
Fermi detected sources given the number densities of AGN from cosmological
simulations. We select only sources with Eddington scaled mass accretion rate
$< 0.01$ (i.e. radiatively inefficient flows), and include cooling, orientation
effects, and the effects of absorption from pair production on the
extragalactic IR background.
  These models overpredict the number of Fermi detected BL Lacs by a factor of
1000! This clearly shows that one of the underlying assumptions is incorrect,
almost certainly that jets do not scale simply with mass and accretion rate.
The most plausible additional parameter which can affect the region producing
the Fermi emission is black hole spin. We can reproduce the observed numbers of
BL Lacs if such relativistic jets are only produced by the highest spin
($a_*>0.8$) black holes, in agreement with the longstanding spin-jet paradigm.
This also requires that high spins are intrinsically rare, as predicted by the
cosmological simulations for growing black hole mass via chaotic (randomly
aligned) accretion episodes, where only the most massive black holes have high
spin due to black hole-black hole mergers.


title:
Parameter-dependent associative Yang-Baxter equations and Poisson
  brackets

abstract:
  We discuss associative analogues of classical Yang-Baxter equation
meromorphically dependent on parameters. We discover that such equations enter
in a description of a general class of parameter-dependent Poisson structures
and double Lie and Poisson structures in sense of M. Van den Bergh. We propose
a classification of all solutions for one-dimensional associative Yang-Baxter
equations.


title:
Evidence of magnetic field quenching of phosphorous-doped silicon
  quantum dots

abstract:
  We present data on the electrical transport properties of highly-doped
silicon-on-insulator quantum dots under the effect of pulsed magnetic fields up
to 48 T. At low field intensities, B<7 T, we observe a strong modification of
the conductance due to the destruction of weak localization whereas at higher
fields, where the magnetic field length becomes comparable to the effective
Bohr radius of phosphorous in silicon, a strong decrease in conductance is
demonstrated. Data in the high and low electric field bias regimes are then
compared to show that close to the Coulomb blockade edge magnetically-induced
quenching to single donors in the quantum dot is achieved at about 40 T.


title: Weighing the Light Gravitino Mass with Weak Lensing Surveys

abstract:
  We explore the discovery potential of light gravitino mass m_{3/2} by
combining future cosmology surveys and collider experiments. The former probe
the imprint of light gravitinos in the cosmic matter density field, whereas the
latter search signatures of a supersymmetry breaking mechanism. Free-streaming
of light gravitinos suppresses the density fluctuations at galactic and
sub-galactic length scales, where weak gravitational lensing can be used as a
powerful probe. We perform numerical simulations of structure formation to
quantify the effect. We then run realistic ray-tracing simulations of
gravitational lensing to measure the cosmic shear in models with light
gravitino. We forecast the possible reach of future wide-field surveys by
Fisher analysis; the light gravitino mass can be determined with an accuracy of
m_{3/2}=4\pm 1 eV by a combination of the Hyper Suprime Cam survey and cosmic
microwave background anisotropy data obtained by Planck satellite. The
corresponding accuracy to be obtained by the future Large Synoptic Survey
Telescope is \delta m_{3/2}=0.6 eV. Data from experiments at Large Hadron
Collider at 14 TeV will provide constraint at m_{3/2} \simeq 5 eV in the
minimal framework of gauge-mediated supersymmetry breaking (GMSB) model. We
conclude that a large class of the GMSB model can be tested by combining the
cosmological observations and the collider experiments.


title:
Chiral restoration and deconfinement in two-color QCD with two flavors
  of staggered quarks

abstract:
  In preparation of lattice studies of the two-color QCD phase diagram we study
chiral restoration and deconfinement at finite temperature with two flavors of
staggered quarks using an RHMC algorithm on GPUs. We first study unquenching
effects in local Polyakov loop distributions, and the Polyakov loop potential
obtained via Legendre transformation, in a fixed-scale approach for heavier
quarks. We also present the chiral condensate and the corresponding
susceptibility over the lattice coupling across the chiral transition for
lighter quarks. Using Ferrenberg-Swendsen reweighting we extract the maxima of
the chiral susceptibility in order to determine pseudo-critical couplings on
various lattices suitable for chiral extrapolations. These are then used to fix
the relation between coupling and temperature in the chiral limit.


title:
Theory and MD simulations of intrinsic localized modes and defect
  formation in solids

abstract:
  MD simulations of recoil processes following the scattering of X-rays or
neutrons have been performed in ionic crystals and metals. At small energies
(<10 eV) the recoil can induce intrinsic localized modes (ILMs) and linear
local modes associated with them. As a rule, the frequencies of such modes are
located in the gaps of the phonon spectrum. However, in metallic Ni, Nb and Fe,
due to the renormalization of atomic interactions by free electrons, the
frequencies mentioned are found to be positioned above the phonon spectrum. It
has been shown that these ILMs are highly mobile and can efficiently transfer a
concentrated vibrational energy to large distances along crystallographic
directions. If the recoil energy exceeds tens of eVs, vacancies and
interstitials can be formed, being strongly dependent on the direction of the
recoil momentum. In NaCl-type lattices the recoil in (110) direction can
produce a vacancy and a crowdion, while in the case of a recoil in (100) and in
(111) directions a bi-vacancy and a crowdion can be formed.


title:
Photonic Angle-of-arrival Measurement of a Microwave Signal with Range
  Selectivity and SNR Enhancement

abstract:
  A novel parallel optical delay detector (PODD) is proposed for
angle-of-arrival (AOA) measurement of a microwave signal with selective
measurement range and signal-to-noise (SNR) enhancement. The PODD is
experimentally demonstrated by using a dual parallel Mach-Zehnder modulator.
The noise robustness enhancement is experimentally investigated. Based on the
proposed PODD, the measurement error for the full range can be less than 0.02
radian (0.71% of full measured range).


title: The optical emission lines of type 1 X-ray bright Active Galactic Nuclei

abstract:
  A strong X-ray emission is one of the defining signatures of nuclear activity
in galaxies. According to the Unified Model for Active Galactic Nuclei (AGN),
both the X-ray radiation and the prominent broad emission lines, characterizing
the optical and UV spectra of Type 1 AGNs, are originated in the innermost
regions of the sources, close to the Super Massive Black Holes (SMBH), which
power the central engine. Since the emission is concentrated in a very compact
region (with typical size $r < 0.1\,$pc) and it is not possible to obtain
resolved images of the source, spectroscopic studies of this radiation
represent the only valuable key to constrain the physical properties of matter
and its structure in the center of active galaxies. Based on previous studies
on the physics of the Broad Line Region (BLR) and on the X-ray spectra of broad
(FWHMH$_{\rm H\beta}$ > 2000 km/s) and narrow line (1000 km/s < FWHMH$_{\rm
H\beta}\, \leq$ 2000 km/s) emitting objects, it has been observed that the
kinematic and ionization properties of matter close to the SMBHs are related
together, and, in particular, that ionization is higher in narrow line sources.
Here we report on the study of the optical and X-ray spectra of a sample of
Type 1 AGNs, selected from the Sloan Digital Sky Survey (SDSS) database, within
an upper redshift limit of z = 0.35, and detected at X-ray energies. We present
analysis of the broad emission line fluxes and profiles, as well as the
properties of the X-ray continuum and Fe K$\alpha$ emission and we use these
parameters to assess the consistency of our current AGN understanding.


title: Antiferromagnetic Domain Wall Motion Induced by Spin Waves

abstract:
  Spin waves in antiferromagnets are linearly or circularly polarized.
Depending on the polarization, traversing spin waves alter the staggered field
in a qualitatively different way. We calculate the drift velocity of a moving
domain wall as a result of spin wave mediated forces, and show that the domain
wall moves in opposite directions for linearly and circularly polarized waves.
The analytical results agree with a micromagnetics simulation of an
antiferromagnetic domain wall driven by a localized and alternating magnetic
field.


title: Holographic Entanglement Entropy for 4D Conformal Gravity

abstract:
  Using the proposal for holographic entanglement entropy in higher derivative
gravities, we compute holographic entanglement entropy for the conformal
gravity in four dimensions which turns out to be finite. However, if one
subtracts the contribution of the four dimensional Gauss-Bonnet term, the
corresponding entanglement entropy has a divergent term and indeed restricted
to an Einstein solution of the conformal gravity, the resultant entanglement
entropy is exactly the same as that in the Einstein gravity. We will also make
a comment on the first law of the entanglement thermodynamics for the conformal
gravity in four dimensions.


title:
Pressure, density, temperature and entropy fluctuations in compressible
  turbulent plane channel flow

abstract:
  We investigate the fluctuations of thermodynamic state-variables in
compressible aerodynamic wall-turbulence, using results of direct numerical
simulation (DNS) of compressible turbulent plane channel flow. The basic
transport equations governing the behaviour of thermodynamic variables
(density, pressure, temperature and entropy) are reviewed and used to derive
the exact transport equations for the variances and fluxes (transport by the
fluctuating velocity field) of the thermodynamic fluctuations. The scaling with
Reynolds and Mach number of compressible turbulent plane channel flow is
discussed. Correlation coefficients and higher-order statistics of the
thermodynamic fluctuations are examined. Finally, detailed budgets of the
transport equations for the variances and fluxes of the thermodynamic variables
from a well-resolved DNS are analysed. Implications of these results both to
the understanding of the thermodynamic interactions in compressible
wall-turbulence and to possible improvements in statistical modelling are
assessed. Finally, the required extension of existing DNS data to fully
characterise this canonical flow is discussed.


title:
Covering an arithmetic progression with geometric progressions and vice
  versa

abstract:
  We show that there exists a positive constant C such that the following
holds: Given an infinite arithmetic progression A of real numbers and a
sufficiently large integer n (depending on A), there needs at least Cn
geometric progressions to cover the first n terms of A. A similar result is
presented, with the role of arithmetic and geometric progressions reversed.


title: Finitely presented simple modules over Leavitt path algebras

abstract:
  Let $E$ be an arbitrary graph and $K$ be any field. We construct various
classes of non-isomorphic simple modules over the Leavitt path algebra
$L_{K}(E)$ induced by vertices which are infinite emiters, closed paths which
are exclusive cycles and paths which are infinite, and call these simple
modules Chen modules. It is shown that every primitive ideal of $L_{K}(E)$ can
be realized as the annihilator ideal of some Chen module. Our main result
establishes the equivalence between a graph theoretic condition and various
conditions concerning the structure of simple modules over $L_K(E)$.


title: Signatures of large-scale structure of Universe in X-rays

abstract:
  A new sample of 4299 galaxies with X-ray emission was obtained in this work
by cross-correlating 2XMM catalog of X-ray sources with HyperLeda database of
galaxies. We analyzed distributions of optical and X-ray fluxes, redshifts and
X-ray luminosities for this sample. Virgo and Coma galaxy clusters can be
easily detected at redshift-space distribution of X-ray galaxies. X-ray
luminosity function of our galaxies shows the evidences of cosmological
evolution, even at low redshifts.


title:
Study of the family of Nonlinear Schrodinger equations by using the
  Adler-Kosant-Symes framework and the Tu methodology and their Non-holonomic
  deformation

abstract:
  The objective of this work is to explore the class of equations of the
Non-linear Schrodinger type by employing the Adler-Kostant-Symes theorem and
the Tu methodology.In the first part of the work, the AKS theory is discussed
in detail showing how to obtain the non-linear equations starting from a
suitably chosen spectral problem.Equations derived by this method include
different members of the NLS family like the NLS, the coupled KdV type NLS, the
generalized NLS, the vector NLS, the Derivative NLS, the Chen-Lee-Liu and the
Kundu-Eckhaus equations. In the second part of the paper, the steps in the Tu
methodology that are used to formulate the hierarchy of non-linear evolution
equations starting from a spectral problem, are outlined. The AKNS,
Kaup-Newell, and generalized DNLS hierarchies are obtained by using this
algorithm. Several reductions of the hierarchies are illustrated. The famous
trace identity is then applied to obtain the Hamiltonian structure of these
hierarchies and establish their complete integrability. In the last part of the
paper, the non-holonomic deformation of the class of integrable systems
belonging to the NLS family is studied. Equations examined include the NLS,
coupled KdV-type NLS and Derivative NLS (both Kaup-Newell and Chen-Lee-Liu
equations). NHD is also applied to the hierarchy of equations in the AKNS
system and the KN system obtained through application of the Tu
methodology.Finally, we discuss the connection between the two formalisms and
indicate the directions of our future endeavour in this area.


title:
SOPHIE velocimetry of Kepler transit candidates: X KOI-142c: first
  radial velocity confirmation of a non-transiting exoplanet discovered by
  transit timing

abstract:
  The exoplanet KOI-142b (Kepler-88b) shows transit timing variations (TTVs)
with a semi-amplitude of $\sim 12\,$ hours, earning the nickname of "king of
transit variations". Only the transit of the planet b was detected in the
Kepler data with an orbital period of $\sim 10.92\,$ days and a radius of $\sim
0.36$ R$_{\mathrm{Jup}}$. The TTVs together with the transit duration
variations (TDVs) of KOI-142b were analysed by Nesvorny et al. (2013) who found
a unique solution for a companion perturbing planet. The authors predicted an
outer non-transiting companion, KOI-142c, with a mass of $0.626\pm 0.03$
M$_{\mathrm{Jup}}$ and a period of $22.3397^{+0.0021}_{-0.0018}\,$days, and
hence close to the 2:1 mean-motion resonance with the inner transiting planet.
We report independent confirmation of KOI-142c using radial velocity
observations with the SOPHIE spectrograph at the Observatoire de
Haute-Provence. We derive an orbital period of $22.10 \pm 0.25\,$days and a
minimum planetary mass of $0.76^{+0.32}_{0.16}\,$ M$_{\mathrm{Jup}}$, both in
good agreement with the predictions by previous transit timing analysis.
Therefore, this is the first radial velocity confirmation of a non-transiting
planet discovered with transit timing variations, providing an independent
validation of the TTVs technique.


title: Temporal scaling in information propagation

abstract:
  For the study of information propagation, one fundamental problem is
uncovering universal laws governing the dynamics of information propagation.
This problem, from the microscopic perspective, is formulated as estimating the
propagation probability that a piece of information propagates from one
individual to another. Such a propagation probability generally depends on two
major classes of factors: the intrinsic attractiveness of information and the
interactions between individuals. Despite the fact that the temporal effect of
attractiveness is widely studied, temporal laws underlying individual
interactions remain unclear, causing inaccurate prediction of information
propagation on evolving social networks. In this report, we empirically study
the dynamics of information propagation, using the dataset from a
population-scale social media website. We discover a temporal scaling in
information propagation: the probability a message propagates between two
individuals decays with the length of time latency since their latest
interaction, obeying a power-law rule. Leveraging the scaling law, we further
propose a temporal model to estimate future propagation probabilities between
individuals, reducing the error rate of information propagation prediction from
6.7% to 2.6% and improving viral marketing with 9.7% incremental customers.


title: Bright X-ray galaxies in SDSS filaments

abstract:
  Eighteen bright X-ray emitting galaxies were found in nearby filaments within
SDSS region. Basic X-ray spectral parameters were estimated for these galaxies
using power law model with photoelectric absorption. A close pair of X-ray
galaxies was found.


title:
The adjoint representation inside the exterior algebra of a simple Lie
  algebra

abstract:
  For a simple complex Lie algebra $\mathfrak g$ we study the space of
invariants $A=\left( \bigwedge \mathfrak g^*\otimes\mathfrak
g^*\right)^{\mathfrak g}$, (which describes the isotypic component of type
$\mathfrak g$ in $ \bigwedge \mathfrak g^*$) as a module over the algebra of
invariants $\left(\bigwedge \mathfrak g^*\right)^{\mathfrak g}$. As main result
we prove that $A$ is a free module, of rank twice the rank of $\mathfrak g$,
over the exterior algebra generated by all primitive invariants in $(\bigwedge
\mathfrak g^*)^{\mathfrak g}$, with the exception of the one of highest degree.


title: BOKS 45906: a CV with an orbital period of 56.6 min in the Kepler field?

abstract:
  BOKS 45906 was found to be a blue source in the Burrell-Optical-Kepler-Survey
which showed a 3 mag outburst lasting ~5 d. We present the Kepler light curve
of this source which covers nearly 3 years. We find that it is in a faint
optical state for approximately half the time and shows a series of outbursts
separated by distinct dips in flux. Using data with 1 min sampling, we find
clear evidence that in its low state BOKS 45906 shows a flux variability on a
period of 56.5574+/-0.0014 min and a semi-amplitude of ~3 percent. Since we can
phase all the 1 min cadence data on a common ephemeris using this period, it is
probable that 56.56 min is the binary orbital period. Optical spectra of BOKS
45906 show the presence of Balmer lines in emission indicating it is not an AM
CVn (pure Helium) binary. Swift data show that it is a weak X-ray source and is
weakly detected in the bluest of the UVOT filters. We conclude that BOKS 45906
is a cataclysmic variable with a period shorter than the `period-bounce'
systems and therefore BOKS 45906 could be the first helium-rich cataclysmic
variable detected in the Kepler field.


title: New constraints on GRB jet geometry and relativistic shock physics

abstract:
  We use high--quality, multi-band observations of Swift GRB120404A, from
gamma-ray to radio frequencies, together with the new hydrodynamics code of van
Eerten et al. (2012) to test the standard synchrotron shock model. The
evolution of the radio and optical afterglow, with its prominent optical
rebrightening at t_rest 260-2600 s, is remarkably well modelled by a
decelerating jet viewed close to the jet edge, combined with some early
re-energization of the shock. We thus constrain the geometry of the jet with
half-opening and viewing angles of 23 and 21 deg respectively and suggest that
wide jets viewed off-axis are more common in GRBs than previously thought. We
also derive the fireball microphysics parameters epsilon_B=2.4e-4 and
epsilon_e=9.3e-2 and a circumburst density of n=240 cm^-3. The ability to
self-consistently model the microphysics parameters and jet geometry in this
way offers an alternative to trying to identify elusive canonical jet breaks at
late times. The mismatch between the observed and model-predicted X-ray fluxes
is explained by the local rather than the global cooling approximation in the
synchrotron radiation model, constraining the microphysics of particle
acceleration taking place in a relativistic shock and, in turn, emphasising the
need for a more realistic treatment of cooling in future developments of
theoretical models. Finally, our interpretation of the optical peak as due to
the passage of the forward shock synchrotron frequency highlights the
importance of high quality multi-band data to prevent some optical peaks from
being erroneously attributed to the onset of fireball deceleration.


title:
Numerical study of the SU(2) Yang-Mills vacuum state: Much ado about
  nothing?

abstract:
  Numerical results for relative weights of test gauge-field configurations in
the vacuum of the SU(2) lattice gauge theory in (3+1) dimensions are compared
with expectations following from various proposals for the Yang-Mills vacuum
wave functional that interpolate between the free-field limit and the
dimensional-reduction form.


title: Option pricing and hedging with execution costs and market impact

abstract:
  This article considers the pricing and hedging of a call option when
liquidity matters, that is, either for a large nominal or for an illiquid
underlying asset. In practice, as opposed to the classical assumptions of a
price-taking agent in a frictionless market, traders cannot be perfectly hedged
because of execution costs and market impact. They indeed face a trade-off
between hedging errors and costs that can be solved by using stochastic optimal
control. Our modelling framework, which is inspired by the recent literature on
optimal execution, makes it possible to account for both execution costs and
the lasting market impact of trades. Prices are obtained through the
indifference pricing approach. Numerical examples are provided, along with
comparisons to standard methods.


title:
Spin period change and the magnetic fields of neutron stars in Be X-ray
  binaries in the Small Magellanic Cloud

abstract:
  We report on the long-term average spin period, rate of change of spin period
and X-ray luminosity during outbursts for 42 Be X-ray binary systems in the
Small Magellanic Cloud. We also collect and calculate parameters of each system
and use these data to determine that all systems contain a neutron star which
is accreting via a disc, rather than a wind, and that if these neutron stars
are near spin equilibrium, then over half of them, including all with spin
periods over about 100 s, have magnetic fields over the quantum critical level
of 4.4x10^13 G. If these neutron stars are not close to spin equilibrium, then
their magnetic fields are inferred to be much lower, of the order of 10^6-10^10
G, comparable to the fields of neutron stars in low-mass X-ray binaries. Both
results are unexpected and have implications for the rate of magnetic field
decay and the isolated neutron star population.


title: Asymptotics of crank generating functions and Ramanujan congruences

abstract:
  In this paper we obtain asymptotic formulas for the Fourier coefficients of
an infinite family of crank generating functions. Moreover we use this result
to show that the crank obeys certain inequalities. This implies that the crank
can not explain any partition congruences in the usual way beside the three
deduced by Ramanujan.


title:
Description of diffraction grating experiments for photons and electrons
  in Feynman's space-time formulation of quantum mechanics: The quantum origins
  of classical wave theories of light and massive particles

abstract:
  The five laws of relativistic quantum mechanics, according to Feynman's path
integral formulation, are concisely stated and applied to experiments.
Reflection diffraction grating experiments for both photons and electrons are
analysed, in particular the Davisson-Germer experiment in which the wave-like
property of electrons was first established. It is shown how classical, purely
spatial, effective wave theories for both photons and electrons are predicted
by the path integral formulation of quantum mechanics. The standard Copenhagen
interpretation of wave mechanics is critically discussed in the light of the
described experimental applications of the path integral formulation.


title:
Fidelity susceptibility and Loschmidt echo for generic paths in a three
  spin interacting transverse Ising model

abstract:
  We study the effect of presence of different types of critical points such as
ordinary critical point, multicritical point and quasicritical point along
different paths on the Fidelity susceptibility and Loschmidt echo of a three
spin interacting transverse Ising chain using a method which does not involve
the language of tensors. We find that the scaling of fidelity susceptibility
and Loschmidt echo with the system size at these special critical points of the
model studied, is in agreement with the known results, thus supporting our
method.


title:
Output stages inside a negative feedback loop: application to a
  low-voltage three-phase DC-AC converter for educational purposes

abstract:
  The circuit presented in this paper aims at providing three 40 Vpp 50Hz AC
voltages sources with 120-degree phase separation between them. This is a fully
analogue circuit that uses standard, low-cost electronic components without
resorting to a microcontroller as previously proposed by Shirvasar et al [1].
This circuit may serve as a basis for a low-voltage 3P-AC power supply that
students may safely use to realize experiments, i.e. about the principles and
applications of three-phase AC power lines, without the risk of electric
shocks.


title: The Potts model and chromatic functions of graphs

abstract:
  The $U$-polynomial of Noble and Welsh is known to have intimate connections
with the Potts model as well as with several important graph polynomials. For
each graph $G$, $U(G)$ is equivalent to Stanley's symmetric bad colouring
polynomial $XB(G)$. Moreover Sarmiento established the equivalence between $U$
and the polychromate of Brylawski. Loebl defined the $q$-dichromate
$B_q(G,x,y)$ as a function of a graph $G$ and three independent variables
$q,x,y$, proved that it is equal to the partition function of the Potts model
with variable number of states and with a certain external field contribution,
and conjectured that the $q$-dichromate is equivalent to the $U$-polynomial. He
also proposed a stronger conjecture on integer partitions. The aim of this
paper is two-fold. We present a construction disproving Loebl's integer
partitions conjecture, and we introduce a new function $B_{r,q}(G;x,k)$ which
is also equal to the partition function of the Potts model with variable number
of states and with a (different) external field contribution, and we show that
$B_{r,q}(G;x,k)$ is equivalent to the $U$-polynomial and to Stanley's symmetric
bad colouring polynomial.


title:
The CAITLIN Auralization System: Hierarchical Leitmotif Design as a Clue
  to Program Comprehension

abstract:
  Early experiments have suggested that program auralization can convey
information about program structure [8]. Languages like Pascal contain classes
of construct that are similar in nature allowing hierarchical classification of
their features. This taxonomy can be reflected in the design of musical
signatures which are used within the CAITLIN program auralization system.
Experiments using these hierarchical leitmotifs indicate whether or not their
similarities can be put to good use in communicating information about program
structure and state. (Note, at time of going to press experimental results
could not be included. These will be presented at the conference and included
later.)


title:
One dimensional surface profilometry by analyzing the Fresnel
  diffraction pattern from a step

abstract:
  When a coherent quasi-monochromatic light is reflected from a step, a
diffraction pattern is formed that can be described by Fresnel-Kirchhoff
integral and visibility of the fringes depends on the height of the step. In
this paper, it is shown that the Fresnel diffraction from a step can be
described by an interference-like formula. A relationship is derived between
the visibility of the diffraction pattern from 1D step and the step height.
Finally, a novel method is presented for 1D surface testing. The theoretical
and experimental results are presented.


title:
Production of exotic isotopes in complete fusion reactions with
  radioactive beams

abstract:
  The isotopic dependence of the complete fusion (capture) cross section is
analyzed in the reactions
$^{130,132,134,136,138,140,142,144,146,148,150}$Xe+$^{48}$Ca with stable and
radioactive beams. It is shown for the first time that the very neutron-rich
nuclei $^{186-191}$W can be reached with relatively large cross sections by
complete fusion reactions with radioactive ion beams at incident energies near
the Coulomb barrier. A comparison between the complete fusion and fragmentation
reactions for the production of neutron-rich W and neutron-deficient Rn
isotopes is performed.


title: Inelastic collisions of optically trapped metastable calcium atoms

abstract:
  We study binary collisions of metastable calcium atoms ($^{40}$Ca) in an
optical dipole trap. Collisions between $^{3}$P$_{0}$-atoms and between
$^{3}$P$_{0}$ and $^{1}$S$_{0}$-atoms are considered. In the former case, the
elastic and inelastic collision parameters are found to be $5.4\times
10^{-11}\,\mathrm{cm}^{3}\mathrm{s}^{-1}$ and $3.6\times
10^{-11}\,\mathrm{cm}^{3}\mathrm{s}^{-1}$, respectively. A fraction of the
collisions between $^{3}$P$_{0}$-atoms is found to produce cold trapped atoms
in the singlet $^{1}$S$_{0}$ state, suggesting that the internal energy for
these collisions is dissipated by radiation. For collisions between
$^{3}$P$_{0}$ and $^{1}$S$_{0}$-atoms we find a two-body loss parameter of
$8.5\times 10^{-11}\,\mathrm{cm}^{3}\mathrm{s}^{-1}$. Our observations show
that metastable calcium samples in the $^{3}$P$_{0}$-state are not stable at
high densities, as for example required in quantum computing or many-body
quantum simulation schemes.


title: Neutron pair transfer in sub-barrier capture process

abstract:
  The sub-barrier capture reactions following the neutron pair transfer are
proposed to be used for the indirect study of neutron-neutron correlation in
the surface region of nucleus. The strong effect of the dineutron-like clusters
transfer stemming from the surface of magic and non-magic nuclei $^{18}$O,
$^{48}$Ca, $^{64}$Ni, $^{94,96}$Mo, $^{100,102,104}$Ru, $^{104,106,108}$Pd, and
$^{112,114,116,118,120,124,132}$Sn is demonstrated. The dominance of
two-neutron transfer channel at the vicinity of the Coulomb barrier is further
supported by time-dependent mean-field approaches.


title: Spectroscopy of doubly and triply-charmed baryons from lattice QCD

abstract:
  We present the ground and excited state spectra of doubly and triply-charmed
baryons by using lattice QCD with dynamical clover fermions. A large set of
baryonic operators that respect the symmetries of the lattice and are obtained
after subduction from their continuum analogues are utilized. Using novel
computational techniques correlation functions of these operators are generated
and the variational method is exploited to extract excited states. The lattice
spectra that we obtain have baryonic states with well-defined total spins up to
7/2 and the low lying states remarkably resemble the expectations of quantum
numbers from SU(6) $\otimes$ O(3) symmetry. Various energy splittings between
the extracted states, including splittings due to hyperfine as well as
spin-orbit coupling, are considered and those are also compared against similar
energy splittings at other quark masses. Using those splittings for
doubly-charmed baryons, and taking input of experimental $B_c$ meson mass, we
predict the mass splittings of $B^*_c - B_c$ to be about 80 $\pm$ 8 MeV and
$m_{\Omega_{ccb}} = 8050\pm10$ MeV.


title: Chiral covers of hypermaps

abstract:
  Generalising a conjecture of Singerman, it is shown that there exist
orientably regular chiral hypermaps of every non-spherical type. The proof uses
the representation theory of automorphism groups acting on homology and on
various spaces of differentials. Some examples are given.


title: Two-body wrong-sign mixing and CP violation

abstract:
  We describe LHCb measurements for $D^0$--${\bar{D}}^0$ mixing parameters and
searches for $CP$ violation using "wrong-sign" $D^0\to K^+\pi^-$ two-body
decays. LHCb provides the world's most precise measurements of the mixing
parameters to date, using 3 $fb^{-1}$ of $pp$ collision data. By measuring the
mixing parameters separately for $D^0$ and ${\bar{D}}^0$, and allowing for $CP$
violation, the LHCb results also place the world's most stringent constraints
on the $CP$ violation parameters, $|q/p|$ and $A_D$, from a single experiment.


abstract:
  We establish plurisubharmonicity of the envelope of Lelong functional on
almost complex manifolds of real dimension four, thereby we generalize the
corresponding result for complex manifolds.


title:
FLRW metric $f(R)$ cosmology with a perfect fluid by generating
  integrals of motion

abstract:
  In the context of metric f(R) gravity, we consider a FLRW space-time, filled
with a perfect fluid described by a barotropic equation of state (p = \gamma
\rho). We give the equivalent mini-superspace description and use the
reparametrization invariance of the resulting Lagrangian to work in the
equivalent constant potential description. At that point, we restrict our
analysis to those models for which the ensuing scaled mini-superspace is
maximally symmetric. Those models exhibit the maximum number of autonomous
integrals of motion linear in the momenta, which are constructed by the Killing
vectors of the respective mini-supermetric. The integrals of motion are used to
analytically solve the equations of the corresponding models. Finally, a brief
description of the properties of the resulting Hubble parameters is given.


title: The degree of the dormant operatic locus

abstract:
  Let $X$ be a smooth, projective curve of genus $g\geq 2$ over an
algebraically closed field of characteristic $p>0$. I provide a conjectural
formula for the degree of the scheme of dormant ${\rm PGL}(r)$-opers on $X$
where $r\geq 2$ (I assume that $p$ is greater than an explicit constant
depending on $g,r$). For $r=2$ a dormant ${\rm PGL}(2)$-oper is a dormant
indigenous bundle on $X$ in the sense of Shinichi Mochuzki (and his work
provides a formula only for $g=2,r=2,p\geq 5$, from a different point of view).
Recently Yasuhiro Wakabayashi has shown that my conjectural formula holds for
$X$ generic, $r\geq 2$ and $p$ large.


title: Radiative Generation of the Lepton Mass

abstract:
  We propose a new mechanism where both Dirac masses for the charged-leptons
and Majorana masses for neutrinos are generated via quantum levels. The
charged-lepton masses are given by the vacuum expectation values (VEVs) of the
Higgs doublet field and that of a triplet field. On the other hand, neutrino
masses are generated by two VEVs of triplet Higgs fields. As a result, the
hierarchy between the masses for charged-leptons and neutrinos can be explained
by the triplet VEVs which have to be much smaller than the doublet VEV due to
the constraint from the electroweak rho parameter. We construct a concrete
model to realize this mechanism with discrete $\mathbb{Z}_2$ and $\mathbb{Z}_4$
symmetries, in which masses for neutrinos and those for the muon and electron
are generated at the one-loop level. As a bonus in our model, the deviation in
the measured muon $g-2$ from the standard model prediction can be explained by
contributions of extra particle loops. Besides, the lightest $\mathbb{Z}_2$-odd
neutral particle can be a dark matter candidate. The collider phenomenology is
also discussed, especially focusing on doubly-charged scalar bosons which are
necessary to introduce to occur our mechanism.


title: JKCS041: a Coma cluster progenitor at z=1.803

abstract:
  Using deep two-color near-infrared HST imaging and unbiased grism
spectroscopy we present a detailed study of the z=1.803 JKCS041 cluster.
Uniquely, for a high redshift cluster, we confirm a mass of $\log M=14.2$ in
solar units using four different techniques based on the X-ray temperature, the
X-ray luminosity and the cluster richness. JKCS041 is thus a progenitor of a
local system like the Coma cluster. Our rich dataset and the abundant
population of 14 spectroscopically-confirmed red sequence galaxies allows us to
explore the past star formation history of this system in unprecedented detail.
Remarkably, we find a prominent red sequence down to stellar masses as low as
$\log M=9.8$, corresponding to a mass range of 2 dex. These quiescent galaxies
are concentrated around the cluster center with a core radius of 330 kpc. Blue
members are few and avoid the cluster center. In JKCS041 quenching was
therefore largely completed by a look-back time of 10 Gyr and we can constrain
the epoch at which this occurred via spectroscopic age-dating of the individual
galaxies. Most galaxies were quenched about 1.1 Gyr prior to the epoch of
observation. The less massive quiescent galaxies are somewhat younger,
corresponding to a decrease in age of 650 Myr per mass dex, but the scatter in
age at fixed mass is only 380 Myr (at $\log M=11$). The size-mass relation of
quiescent galaxies in JKCS041 is consistent with that observed for local
clusters within our uncertainties. Comparing our data on JKCS041 with 41
clusters at lower redshift, we find that the form of the mass function of red
sequence galaxies has hardly evolved in the past 10 Gyr, both in terms of its
faint end slope and characteristic mass. Despite observing JKCS041 soon after
its quenching and the three fold expected increase in mass in the next 10 Gyr,
it is already remarkably similar to present-day clusters.


title: Sparse Identification of Posynomial Models

abstract:
  Posynomials are nonnegative combinations of monomials with possibly
fractional and both positive and negative exponents. Posynomial models are
widely used in various engineering design endeavors, such as circuits,
aerospace and structural design, mainly due to the fact that design problems
cast in terms of posynomial objectives and constraints can be solved
efficiently by means of a convex optimization technique known as geometric
programming (GP). However, while quite a vast literature exists on GP-based
design, very few contributions can yet be found on the problem of identifying
posynomial models from experimental data. Posynomial identification amounts to
determining not only the coefficients of the combination, but also the
exponents in the monomials, which renders the identification problem
numerically hard. In this draft, we propose an approach to the identification
of multivariate posynomial models, based on the expansion on a given
large-scale basis of monomials. The model is then identified by seeking
coefficients of the combination that minimize a mixed objective, composed by a
term representing the fitting error and a term inducing sparsity in the
representation, which results in a problem formulation of the ``square-root
LASSO'' type, with nonnegativity constraints on the variables. We propose to
solve the problem via a sequential coordinate-descent scheme, which is suitable
for large-scale implementations.


title: Suppressing Hawking radiation by quantum Zeno effect

abstract:
  We present evidence that quantum Zeno effect, otherwise working only for
microscopic systems, may also work for large black holes (BH's). The
expectation that a BH geometry should behave classically at time intervals
larger than the Planck time t_Pl indicates that the quantum process of
measurement of classical degrees of freedom takes time of the order of t_Pl.
Since BH has only a few classical degrees of freedom, such a fast measurement
makes a macroscopic BH strongly susceptible to the quantum Zeno effect, which
repeatedly collapses the quantum state to the initial one, the state before the
creation of Hawking quanta. By this mechanism, Hawking radiation from a BH of
mass M is strongly suppressed by a factor of the order of m_Pl/M.