title: Collective resonances in $\chi^{(3)}$; a QED study

abstract:
  We calculate the third order susceptibility $\chi^{(3)}$ of a pair of 2 level
atoms which interact via the exchange of photons. QED corrections to second
order in coupling to vacuum field modes yield collective two photon absorption
resonances which can be observed in transmission spectroscopy of shaped
broadband pulses. While some collective effects can be obtained by introducing
an effective interatomic coupling using a quantum master equation, the
predicted signals contain clear features that are missed by that level of
theory and require a full diagrammatic QED treatment.


title: Review of: Mixed Effects Models and Extensions in Ecology with R

abstract:
  This is a review of the book "Mixed Effects Models and Extensions in Ecology
with R" by Zuur, Ieno, Walker, Saveliev and Smith (2009, Springer). I was asked
to review this book for The American Statistician in 2010. After I wrote the
review, the invitation was revoked. This is the review.


title:
Classification of embeddings of abelian extensions of $D_n$ into
  $E_{n+1}$

abstract:
  An abelian extension of the special orthogonal Lie algebra $D_n$ is a
nonsemisimple Lie algebra $D_n \inplus V$, where $V$ is a finite-dimensional
representation of $D_n$, with the understanding that $[V,V]=0$. We determine
all abelian extensions of $D_n$ that may be embedded into the exceptional Lie
algebra $E_{n+1}$, $n=5, 6$, and 7. We then classify these embeddings, up to
inner automorphism. As an application, we also consider the restrictions of
irreducible representations of $E_{n+1}$ to $D_n \inplus V$, and discuss which
of these restrictions are or are not indecomposable.


title: Spectroscopy of Type Ia Supernovae by the Carnegie Supernova Project

abstract:
  This is the first release of optical spectroscopic data of low-redshift Type
Ia supernovae (SNe Ia) by the Carnegie Supernova Project including 604
previously unpublished spectra of 93 SNe Ia. The observations cover a range of
phases from 12 days before to over 150 days after the time of B-band maximum
light. With the addition of 228 near-maximum spectra from the literature we
study the diversity among SNe Ia in a quantitative manner. For that purpose,
spectroscopic parameters are employed such as expansion velocities from
spectral line blueshifts, and pseudo-equivalent widths (pW). The values of
those parameters at maximum light are obtained for 78 objects, thus providing a
characterization of SNe Ia that may help to improve our understanding of the
properties of the exploding systems and the thermonuclear flame propagation.
Two objects, namely SNe 2005M and 2006is, stand out from the sample by showing
peculiar Si II and S II velocities but otherwise standard velocities for the
rest of the ions. We further study the correlations between spectroscopic and
photometric parameters such as light-curve decline rate and color. In agreement
with previous studies, we find that the pW of Si II absorption features are
very good indicators of light-curve decline rate. Furthermore, we demonstrate
that parameters such as pW2(SiII4130) and pW6(SiII5972) provide precise
calibrations of the peak B-band luminosity with dispersions of ~0.15 mag. In
the search for a secondary parameter in the calibration of peak luminosity for
SNe Ia, we find a ~2--3-sigma correlation between B-band Hubble residuals and
the velocity at maximum light of S II and Si II lines.


title: The limitations of the Poincar{\'e} inequality

abstract:
  We examine the validity of the Poincar\'e inequality for degenerate,
second-order, elliptic operators $H$ in divergence form on
$L_2(\Ri^{n}\times\Ri^{m})$. We assume the coefficients are real symmetric and
$a_1H_\delta\geq H\geq a_2H_\delta$ for some $a_1,a_2>0$ where $H_\delta$ is a
generalized Gru\v{s}in operator, \[
H_\delta=-\nabla_{x_1}\,|x_1|^{(2\delta_1,2\delta_1')}\,\nabla_{x_1}-|x_1|^{(2\delta_2,2\delta_2')}\,\nabla_{x_2}^2
\;. \] Here $x_1\in\Ri^n$, $x_2\in\Ri^m$, $\delta_1,\delta_1'\in[0,1\rangle$,
  $\delta_2,\delta_2'\geq0$ and $|x_1|^{(2\delta,2\delta')}=|x_1|^{2\delta}$ if
$|x_1|\leq 1$ and $|x_1|^{(2\delta,2\delta')}=|x_1|^{2\delta'}$ if $|x_1|\geq
1$.
  \smallskip
  We prove that the Poincar\'e inequality, formulated in terms of the
Riemannian geometry corresponding to $H$, is valid if $n\geq 2$, or if $n=1$
and $\delta_1\vee\delta_1'\in[0,1/2\rangle$ but it fails if $n=1$ and
$\delta_1\vee\delta_1'\in[1/2,1\rangle$. The failure is caused by the leading
term. If $\delta_1\in[1/2, 1\rangle$ it is an effect of the local degeneracy
$|x_1|^{2\delta_1}$ but if $\delta_1\in[0, 1/2\rangle$ and $\delta_1'\in
[1/2,1\rangle$ it is an effect of the growth at infinity of
$|x_1|^{2\delta_1'}$.
  If $n=1$ and $\delta_1\in[1/2, 1\rangle$ then the semigroup $S$ generated by
the Friedrichs' extension of $H$ is not ergodic. The subspaces $x_1\geq 0$ and
$x_1\leq 0$ are $S$-invariant and the Poincar\'e inequality is valid on each of
these subspaces. If, however, $n=1$, $\delta_1\in[0, 1/2\rangle$ and
$\delta_1'\in [1/2,1\rangle$ then the semigroup $S$ is ergodic but the
Poincar\'e inequality is only valid locally.
  \smallskip
  Finally we discuss the implication of these results for the kernel of the
semigroup $S$.


title: Transport functions for hypercubic and Bethe lattices

abstract:
  In calculations of transport quantities, such as the electrical conductivity,
thermal conductivity, Seebeck, Peltier, Nernst, Ettingshausen, Righi-Leduc, or
Hall coefficients, sums over the Brillouin zone of wave-vector derivatives of
the dispersion relation commonly appear. When the self-energy depends only on
frequency, as in single-site dynamical mean-field theory, it is advantageous to
perform these sums once and for all. We show here that in the case of a
hypercubic lattice in d dimensions, the sums needed for any of the transport
coefficients can be expressed as integrals over powers of the energy weighted
by the energy-dependent non-interacting density of states. It is also shown
that our exact expressions for the transport functions can be obtained from
differential equations that follow from sum rules. By substituting the Bethe
lattice density of states, one can obtain the previously unknown transport
function for the electrical or thermal Hall coefficients and for the Nernst
coefficient of the Bethe lattice.


title:
Optical time domain reflectometry with low noise waveguide-coupled
  superconducting nanowire single-photon detectors

abstract:
  We demonstrate optical time domain reflectometry over 200 km of optical fiber
using low-noise NbTiN superconducting single-photon detectors integrated with
Si3N4 waveguides. Our small detector footprint enables high timing resolution
of 50ps and a dark count rate of 3 Hz with unshielded fibers, allowing for
identification of defects along the fiber over a dynamic range of 37.4 dB.
Photons scattered and reflected back from the fiber under test can be detected
in free-running mode without showing dead zones or other impairments often
encountered in semiconductor photon-counting optical time domain
reflectometers.


title: Double-spin asymmetry $A_{LT}$ in open charm production

abstract:
  In the collinear twist-three approach, we calculate for the first time the
gluon contribution to double (longitudinal-transverse) spin asymmetry A_{LT}
for open charm production in proton-proton collisions measurable at RHIC.
Utilizing the Ward-Takahashi identity for the non-pole part of the hard
scattering amplitude, we derive a factorized, gauge invariant formula for the
asymmetry. The result may be combined with the previous studies of single-spin
asymmetry in the same channel and allows for a systematic analysis of
three-gluon correlations inside a transversely polarized nucleon.


title: Analysis of degenerate elliptic operators of Gru\v{s}in type

abstract:
  We analyze degenerate, second-order, elliptic operators $H$ in divergence
form on $L_2(\Ri^{n}\times\Ri^{m})$. We assume the coefficients are real
symmetric and $a_1H_\delta\geq H\geq a_2H_\delta$ for some $a_1,a_2>0$ where \[
H_\delta=-{\nabla}_{x_1}\cdot(c_{\delta_1,
\delta'_1}(x_1)\,\nabla_{x_1})-c_{\delta_2, \delta'_2}(x_1)\,\nabla_{x_2}^2 \;.
\] Here $x_1\in\Ri^n$, $x_2\in\Ri^m$ and $c_{\delta_i, \delta'_i}$ are positive
measurable functions such that $c_{\delta_i, \delta'_i}(x)$ behaves like
$|x|^{\delta_i}$ as $x\to0$ and $|x|^{\delta_i'}$ as $x\to\infty$ with
$\delta_1,\delta_1'\in[0,1\rangle$ and $\delta_2,\delta_2'\geq0$.
  Our principal results state that the submarkovian semigroup $S_t=e^{-tH}$ is
conservative and its kernel $K_t$ satisfies bounds \[ 0\leq K_t(x\,;y)\leq
a\,(|B(x\,;t^{1/2})|\,|B(y\,;t^{1/2})|)^{-1/2} \] where $|B(x\,;r)|$ denotes
the volume of the ball $B(x\,;r)$ centred at $x$ with radius $r$ measured with
respect to the Riemannian distance associated with $H$. The proofs depend on
detailed subelliptic estimations on $H$, a precise characterization of the
Riemannian distance and the corresponding volumes and wave equation techniques
which exploit the finite speed of propagation.
  We discuss further implications of these bounds and give explicit examples
that show the kernel is not necessarily strictly positive, nor continuous.


title:
Multivalued Stochastic Delay Differential Equations and Related
  Stochastic Control Problems

abstract:
  We study the existence and uniqueness of a solution for the multivalued
stochastic differential equation with delay (the multivalued term is of
subdifferential type): \[ \left\{\begin{array} [c]{r}
dX(t)+\partial\varphi\left(X(t)\right) dt\ni b\left(t,X(t),Y(t),Z(t)\right)
dt+\sigma\left(t,X(t),Y(t),Z(t)\right)dW(t), \medskip\\ t\in(s,T],\medskip\\
\multicolumn{1}{l}{X(t)=\xi\left(t-s\right) ,\;t\in\left[ s-\delta,s\right] .}
\end{array} \right. \]
  Specify that in this case the coefficients at time $t$ depends also on
previous values of $X\left(t\right) $ through $Y(t)$ and $Z(t)$. Also $X$ is
constrained with the help of a bounded variation feedback law $K$ to stay in
the convex set $\bar{\mathrm{Dom}\left(\varphi\right)}$. Afterwards we consider
optimal control problems where the state $X$ is a solution of a controlled
delay stochastic system as above. We establish the dynamic programming
principle for the value function and finally we prove that the value function
is a viscosity solution for a suitable Hamilton-Jacobi-Bellman type equation.


title:
Faltings' local-global principle for the finiteness of local cohomology
  modules

abstract:
  Let (R,m) be a complete local ring, a an ideal of R and M a finitely
generated R-module. The aim of this paper is to show that for any non-negative
integer n, the least integer i such that the i-th local cohomology with respect
to a is not in dimension <n, is equal to the n-th finiteness dimension of M
relative to a. This generalizes the main result of Quy and Brodmann-Lashgari.


title:
Generic instabilities in a fluid membrane coupled to a thin layer of
  ordered active polar fluid

abstract:
  We develop an effective two-dimensional coarse-grained description for the
coupled system of a planar fluid membrane anchored to a thin layer of polar
ordered active fluid below. The macroscopic orientation of the active fluid
layer is assumed to be perpendicular to the attached membrane. We demonstrate
that {\em activity} or nonequilibrium drive of the active fluid makes such a
system generically linearly unstable for either signature of a model parameter
$\Delta\mu$ that characterises the strength of activity. Depending upon
boundary conditions and within a range of the model parameters, underdamped
propagating waves may be present in our model. We discuss the phenomenological
significance of our results.


title:
Subgraph Pattern Matching over Uncertain Graphs with Identity Linkage
  Uncertainty

abstract:
  There is a growing need for methods which can capture uncertainties and
answer queries over graph-structured data. Two common types of uncertainty are
uncertainty over the attribute values of nodes and uncertainty over the
existence of edges. In this paper, we combine those with identity uncertainty.
Identity uncertainty represents uncertainty over the mapping from objects
mentioned in the data, or references, to the underlying real-world entities. We
propose the notion of a probabilistic entity graph (PEG), a probabilistic graph
model that defines a distribution over possible graphs at the entity level. The
model takes into account node attribute uncertainty, edge existence
uncertainty, and identity uncertainty, and thus enables us to systematically
reason about all three types of uncertainties in a uniform manner. We introduce
a general framework for constructing a PEG given uncertain data at the
reference level and develop highly efficient algorithms to answer subgraph
pattern matching queries in this setting. Our algorithms are based on two novel
ideas: context-aware path indexing and reduction by join-candidates, which
drastically reduce the query search space. A comprehensive experimental
evaluation shows that our approach outperforms baseline implementations by
orders of magnitude.


title: Estimation of False Discovery Proportion with Unknown Dependence

abstract:
  Large-scale multiple testing with highly correlated test statistics arises
frequently in many scientific research. Incorporating correlation information
in estimating false discovery proportion has attracted increasing attention in
recent years. When the covariance matrix of test statistics is known, Fan, Han
& Gu (2012) provided a consistent estimate of False Discovery Proportion (FDP)
under arbitrary dependence structure. However, the covariance matrix is often
unknown in many applications and such dependence information has to be
estimated before estimating FDP (Efron, 2010). The estimation accuracy can
greatly affect the convergence result of FDP or even violate its consistency.
In the current paper, we provide methodological modification and theoretical
investigations for estimation of FDP with unknown covariance. First we develop
requirements for estimates of eigenvalues and eigenvectors such that we can
obtain a consistent estimate of FDP. Secondly we give conditions on the
dependence structures such that the estimate of FDP is consistent. Such
dependence structures include sparse covariance matrices, which have been
popularly considered in the contemporary random matrix theory. When data are
sampled from an approximate factor model, which encompasses most practical
situations, we provide a consistent estimate of FDP via exploiting this
specific dependence structure. The results are further demonstrated by
simulation studies and some real data applications.


title: A Study of Dirac Fermionic Dark Matters

abstract:
  We study pure weak eigenstate Dirac fermionic dark matters (DM). We consider
WIMP with renormalizable interaction. According to results of direct searches
and the nature of DM (electrical neutral and being a pure weak eigenstate), the
quantum number of DM is determined to be $I_3=Y=0$. There are only two possible
cases: either DM has non-vanishing weak isospin ($I\neq 0$) or it is an
isosinglet (I=0). In the first case, the Sommerfeld enhancement is sizable for
large $I$, producing large $\chi^0\bar{\chi^0}\to VV$ rates. In particular, we
obtain large $\chi\bar\chi\to W^+ W^-$ cross section, which is comparable to
the latest bounds from indirect searches and $m_\chi$ is constrained to be
larger than few hundred GeV to few TeV. It is possible to give correct relic
density with $m_\chi$ higher than these lower bounds. In the second case, to
couple DM to standard model (SM) particles, a SM-singlet vector mediator $X$ is
required from renormalizability and the SM gauge quantum numbers. To satisfy
the latest bounds of direct searches and to reproduce the DM relic density at
the same time, resonant enhancement in DM annihilation diagram is needed. Thus,
the masses of DM and the mediator are related. Furthermore, this model is not
sufficient to explain the deviation in muon $g-2$.


title: Minimal state-dependent proof of measurement contextuality for a qubit

abstract:
  We show that three unsharp binary qubit measurements are enough to violate a
generalized noncontextuality inequality, the LSW inequality, in a
state-dependent manner. For the case of trine spin axes we calculate the
optimal quantum violation of this inequality. Besides, we show that unsharp
qubit measurements do not allow a state-independent violation of this
inequality. We thus provide a minimal state-dependent proof of measurement
contextuality requiring one qubit and three unsharp measurements. Our result
rules out generalized noncontextual models of these measurements which were
previously conjectured to exist. More importantly, this class of generalized
noncontextual models includes the traditional Kochen-Specker (KS) noncontextual
models as a proper subset, so our result rules out a larger class of models
than those ruled out by a violation of the corresponding KS-inequality in this
scenario.


title:
Estimation of an Origin/Destination matrix: Application to a ferry
  transport data

abstract:
  The estimation of the number of passengers with the identical journey is a
common problem for public transport authorities. This problem is also known as
the Origin- Destination estimation (OD) problem and it has been widely studied
for the past thirty years. However, the theory is missing when the observations
are not limited to the passenger counts but also includes station surveys. Our
aim is to provide a solid framework for the estimation of an OD matrix when
only a portion of the journey counts are observable. Our method consists of a
statistical estimation technique for OD matrix when we have the sum-of-row
counts and survey-based observations. Our technique differs from the previous
studies in that it does not need a prior OD matrix which can be hard to obtain.
Instead, we model the passengers behavior through the survey data, and use the
diagonalization of the partial OD matrix to reduce the space parameter and
derive a consistent global OD matrix estimator. We demonstrate the robustness
of our estimator and apply it to several examples showcasing the proposed
models and approach. We highlight how other sources of data can be incorporated
in the model such as explanatory variables, e.g. rainfall, indicator variables
for major events, etc, and inference made in a principled, non-heuristic way.


title: Hecke eigenvalues of Siegel modular forms of "different weights"

abstract:
  Given two Siegel eigenforms of different weights, we determine explicit sets
of Hecke eigenvalues for the two forms that must be distinct. In degree two,
and under some additional conditions, we determine explicit sets of Fourier
coefficients of the two forms that must be distinct.


title: Long time average of first order mean field games and weak KAM theory

abstract:
  We show that the long time average of solutions of first order mean field
game systems in finite horizon is governed by an ergodic system of mean field
game type. The well-posedness of this later system and the uniqueness of the
ergodic constant rely on weak KAM theory.


title:
Combined coherent x-ray micro-diffraction and local mechanical loading
  on copper nanocrystals

abstract:
  Coherent x-ray micro-diffraction and local mechanical loading can be combined
to investigate the mechanical deformation in crystalline nanostructures. Here
we present measurements of plastic deformation in a copper crystal of
sub-micron size obtained by loading the sample with an Atomic Force Microscopy
tip. The appearance of sharp features in the diffraction pattern, while
conserving its global shape, is attributed to crystal defects induced by the
tip.


title: Tweets Miner for Stock Market Analysis

abstract:
  In this paper, we present a software package for the data mining of Twitter
microblogs for the purpose of using them for the stock market analysis. The
package is written in R langauge using apropriate R packages. The model of
tweets has been considered. We have also compared stock market charts with
frequent sets of keywords in Twitter microblogs messages.


title: Weak solutions for first order mean field games with local coupling

abstract:
  Existence and uniqueness of a weak solution for first order mean field game
systems with local coupling are obtained by variational methods. This solution
can be used to devise $\epsilon-$Nash equilibria for deterministic differential
games with a finite (but large) number of players. For smooth data, the first
component of the weak solution of the MFG system is proved to satisfy (in a
viscosity sense) a time-space degenerate elliptic differential equation.


title:
Shell Collision Induced Kilo-Hertz Quasi-Periodic Oscillation in X-Ray
  Binaries

abstract:
  Twin kilo-Hertz Quasi-periodic oscillation with ratio 3/2 has been found in
some compact sources, which is believed to be related with their innermost
regions of accretion disks, and hence carrying information of gravity in strong
regime. However, more complicated phenomena have been revealed, e.g., the twin
kilo-Hertz Quasi-periodic oscillation of 4U 1820-20 start increasing at certain
spectral state and then saturate upon reaching certain level. Moreover, such
quasi-periodic oscillation is not uniform and has multiple peaks, which
displays random feature. This letter suggests that these challenges could be
easy to understand if the quasi-periodic oscillation originates in jets of
compact objects. With a seed periodicity originating in either neutron star
spin or accretion, shell collision develops in jet. The corresponding twin
kilo-Hertz quasi-periodic oscillations automatically carry random feature, vary
in frequency; and couple with luminosity, spectral properties, which well
account for the observation of 4U 1820-30. New quasi-periodic oscillation of 4U
1820-30 is predicted, which can test the validity of this model. And the
scenario is applicable to other compact object like AGN.


title:
The explicit secular equation for surface acoustic waves in monoclinic
  elastic crystals

abstract:
  The secular equation for surface acoustic waves propagating on a monoclinic
elastic half-space is derived in a direct manner, using the method of first
integrals. Although the motion is at first assumed to correspond to generalized
plane strain, the analysis shows that only two components of the mechanical
displacement and of the tractions on planes parallel to the free surface are
nonzero. Using the Stroh formalism, a system of two second order differential
equations is found for the remaining tractions. The secular equation is then
obtained as a quartic for the squared wave speed. This explicit equation is
consistent with that found in the orthorhombic case. The speed of subsonic
surface waves is then computed for twelve specific monoclinic crystals.


title: Matrix Product States for Quantum Many-Fermion Systems

abstract:
  We describe a simple method to find the ground state energy without
calculating the expectation value of the Hamiltonian in the time-evolving block
decimation algorithm with tensor network states. For example, we consider
quantum many-fermion systems with matrix product states, which are updated
consistently in a way that accounts for fermion exchange effects. This method
can be applied to a wide class of fermion systems. We test this method in
spinless fermion system where the exact ground state energy is known. We
analyze finite size effects to determine the ground state energy in the
thermodynamic limit that is compared to the exact value.


title: Surface waves in orthotropic incompressible materials

abstract:
  The secular equation for surface acoustic waves propagating on an orthotropic
incompressible half-space is derived in a direct manner, using the method of
first integrals.


title: Biharmonic surfaces of constant mean curvature

abstract:
  We compute a Simons' type formula for the stress-energy tensor of biharmonic
maps from surfaces. Specializing to Riemannian immersions, we prove several
rigidity results for biharmonic CMC surfaces, putting in evidence the influence
of the Gaussian curvature on pseudo-umbilicity. Finally, the condition of
biharmonicity is shown to enable an extension of the classical Hopf theorem to
CMC surfaces in any ambient Riemannian manifold.


title: Branching ratios and direct CP asymmetries in $D\to PV$ decays

abstract:
  We study the two-body hadronic $D\to PV$ decays, where $P$ ($V$) denotes a
pseudoscalar (vector) meson, in the factorization-assisted
topological-amplitude approach proposed in our previous work. This approach is
based on the factorization of short-distance and long-distance dynamics into
Wilson coefficients and hadronic matrix elements of four-fermion operators,
respectively, with the latter being parametrized in terms of several
nonperturbative quantities. We further take into account the $\rho$-$\omega$
mixing effect, which improves the global fit to the branching ratios involving
the $\rho^0$ and $\omega$ mesons. Combining short-distance dynamics associated
with penguin operators and the hadronic parameters determined from the global
fit to branching ratios, we predict direct $CP$ asymmetries. In particular, the
direct $CP$ asymmetries in the $D^0\to
K^0\overline{K}^{*0},~\overline{K}^0K^{*0}$, $D^+\to\pi^+\rho^0$, and $D_s^+\to
K^+\omega,~K^+\phi$ decays are found to be of ${\cal O}(10^{-3})$, which can be
observed at the LHCb or future Belle II experiment. We also predict the $CP$
asymmetry observables of some neutral $D$ meson decays.


title:
On the metastability of the hexatic phase during the melting of
  two-dimensional charged particle solids

abstract:
  For two-dimensional many-particle systems first-order, second-order, single
step continuous, as well as two-step continuous (KTHNY-like) melting
transitions have been found in previous studies. Recent computer simulations,
using particle numbers in the $\geq 10^5$ range, as well as a few experimental
studies, tend to support the two-step scenario, where the solid and liquid
phases are separated by a third, so called hexatic phase. We have performed
molecular dynamics simulations on Yukawa (Debye-H\"uckel) systems at conditions
earlier predicted to belong to the hexatic phase. Our simulation studies on the
time needed for the equilibration of the systems conclude that the hexatic
phase is metastable and disappears in the limit of long times. We also show
that simply increasing the particle number in particle simulations does not
necessarily result in more accurate conclusions regarding the existence of the
hexatic phase. The increase of the system size has to be accompanied with the
increase of the simulation time to ensure properly thermalized conditions.


title: From jet quenching to wave turbulence

abstract:
  We discuss average properties of the gluon cascade generated by an energetic
parton propagating through a dense QCD medium. The cascade is mostly made with
relatively soft gluons, whose production is not suppressed by the LPM effect.
Unlike for usual QCD cascades in the vacuum, where the typical splittings are
very asymmetric (soft and collinear), the medium-induced branchings are
quasi-democratic and lead to wave turbulence. This results in a very efficient
mechanism for the transport of energy at large angles with respect to the jet
axis, which might explain the di-jet asymmetry observed in Pb-Pb collisions at
the LHC.


title: The reflector problem and the inverse square law

abstract:
  We introduce a model to design reflectors that take into account the inverse
square law for radiation. We prove existence of solutions, both in the near and
far field cases, when the input and output energies are prescribed.


title:
Intrinsic lineshape of the Raman 2D-mode in freestanding graphene
  monolayers

abstract:
  We report a comprehensive study of the two-phonon inter-valley (2D) Raman
mode in graphene monolayers, motivated by recent reports of asymmetric 2D-mode
lineshapes in freestanding graphene. For photon energies in the range $1.53 \rm
eV - 2.71 \rm eV$, the 2D-mode Raman response of freestanding samples appears
as bimodal, in stark contrast with the Lorentzian approximation that is
commonly used for supported monolayers. The transition between the freestanding
and supported cases is mimicked by electrostatically doping freestanding
graphene at carrier densities above $2\times 10^{11} \rm cm^{-2}$. This result
quantitatively demonstrates that low levels of charging can obscure the
intrinsically bimodal 2D-mode lineshape of monolayer graphene, which can be
utilized as a signature of a quasi-neutral sample. In pristine freestanding
graphene, we observe a broadening of the 2D-mode feature with decreasing photon
energy that cannot be rationalized using a simple one-dimensional model based
on resonant \textit{inner} and \textit{outer} processes. This indicates that
phonon wavevectors away from the high-symmetry lines of the Brillouin zone must
contribute to the 2D-mode, so that a full two-dimensional calculation is
required to properly describe multiphonon-resonant Raman processes.


title:
Time-evolution of entanglement and quantum discord of bipartite systems
  subject to 1/f^{\alpha} noise

abstract:
  We study the dynamics of quantum correlations for two non interacting qubits
initially prepared in a maximally entangled state and then coupled with an
external environment characterized by a noise spectrum of the form
1/f^{\alpha}. The noise spectrum is due to the interaction of each qubit with a
collection of N_f classical fluctuators with fixed switching rates. We find
that, depending on the characteristic of the noise spectrum considered, both
entanglement and quantum discord display either a monotonic decay or the
phenomena of sudden death and revivals.


title:
Track segments in hadronic showers in a highly granular
  scintillator-steel hadron calorimeter

abstract:
  We investigate the three dimensional substructure of hadronic showers in the
CALICE scintillator-steel hadronic calorimeter. The high granularity of the
detector is used to find track segments of minimum ionising particles within
hadronic showers, providing sensitivity to the spatial structure and the
details of secondary particle production in hadronic cascades. The
multiplicity, length and angular distribution of identified track segments are
compared to GEANT4 simulations with several different shower models. Track
segments also provide the possibility for in-situ calibration of highly
granular calorimeters.


title:
Higher order expansions for the entropy of a dimer or a monomer-dimer
  system on d-dimensional lattices

abstract:
  Recently an expansion as a power series in 1/d has been presented for the
specific entropy of a complete dimer covering of a d-dimensional hypercubic
lattice. This paper extends from 3 to 10 the number of terms known in the
series. Likewise an expansion for the entropy, dependent on the dimer-density
p, of a monomer-dimer system, involving a sum sum_k a_k(d) p^k, has been
recently offered. We herein extend the number of the known expansion
coefficients from 6 to 20 for the hyper-cubic lattices of general dimension d
and from 6 to 24 for the hyper-cubic lattices of dimensions d < 5 . We show
that this extension can lead to accurate numerical estimates of the p-dependent
entropy for lattices with dimension d > 2. The computations of this paper have
led us to make the following marvelous conjecture: "In the case of the
hyper-cubic lattices, all the expansion coefficients, a_k(d), are positive"!
This paper results from a simple melding of two disparate research programs:
one computing to high orders the Mayer series coefficients of a dimer gas, the
other studying the development of entropy from these coefficients. An effort is
made to make this paper self-contained by including a review of the earlier
works.

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


title:
Scattering from rough surfaces: A simple reflection phenomenon in
  fractional space

abstract:
  In this paper, scattering of incident plane waves from rough surfaces have
been modeled in a fractional space. It is shown how wave scattering from a
rough surface, could be a simple reflection problem in a fractional space. In
the integer space, fluctuations of the surface result in wave scattering while
in the fractional space these fluctuations are compensated by the geometry of
the space. In the fractional space, reflection leads to the same results as the
scattering in the integer space. To make it more clear, scattered wave function
in the framework of Kirchhoff theory is considered in a fractional space and
results are compared with those from a self-affine surfaces. Our results show
that these two approaches are comparable.


title: One and Two-individual Movements of Fish after Chemical Exposure

abstract:
  Movement behavior of an indicator species, zebrafish (Danio rerio), was
analyzed with one- and two-individual groups before and after treatment with a
toxic chemical, formaldehyde, at a low concentration (1 ppm). After the
boundary area had been determined based on experimental data, intermittency was
defined as the probability distributions of the shadowing time during which
data were above a pre-determined threshold and were obtained from experimental
time-series data on forces and the inter-distances for one and two individuals.
Overall intermittencies were similar in the boundary and central areas.
However, the intermittencies were remarkably different between the one- and the
two-individual groups: the single line was used to fit the data for the
one-individual group whereas two phases were observed with breakpoints
(approximately 10 seconds in logarithm) in the exponential fitting curves for
the two-individual group. A difference in the probability distributions of
shadowing time was observed "before" and "after" treatment for different areas.
Intermittency patterns before and after treatment were contrasted in the center
for the one-individual group whereas the difference was observed in the
boundary for two-individual group. The intermittencies for the inter-distances
of two individuals in the boundary and central areas were markedly different
before and after treatment. When the differences between the intermittencies in
the boundary and the central areas and between "before" and "after" treatment
are considered, the distribution patterns of the shadowing time (scaling
behaviors or intermittency patterns) should be a useful means of bio-monitoring
to detect contaminants in the environment.


title:
Cosmological Effects of Scalar-Photon Couplings: Dark Energy and
  Varying-alpha Models

abstract:
  We study cosmological models involving scalar fields coupled to radiation and
discuss their effect on the redshift evolution of the cosmic microwave
background temperature, focusing on links with varying fundamental constants
and dynamical dark energy. We quantify how allowing for the coupling of scalar
fields to photons, and its important effect on luminosity distances, weakens
current and future constraints on cosmological parameters. In particular, for
evolving dark energy models, joint constraints on the dark energy equation of
state combining BAO radial distance and SN luminosity distance determinations,
will be strongly dominated by BAO. Thus, to fully exploit future SN data one
must also independently constrain photon number non-conservation arising from
the possible coupling of SN photons to the dark energy scalar field. We discuss
how observational determinations of the background temperature at different
redshifts can, in combination with distance measures data, set tight
constraints on interactions between scalar fields and photons, thus breaking
this degeneracy. We also discuss prospects for future improvements,
particularly in the context of Euclid and the E-ELT and show that Euclid can,
even on its own, provide useful dark energy constraints while allowing for
photon number non-conservation.


title:
Gravitational lensing in plasma: Relativistic images at homogeneous
  plasma

abstract:
  We investigate the influence of plasma presence on relativistic images formed
by Schwarzschild black hole lensing. When a gravitating body is surrounded by a
plasma, the lensing angle depends on a frequency of the electromagnetic wave
due to refraction properties, and the dispersion properties of the light
propagation in gravitational field in plasma. The last effect leads to
difference, even in uniform plasma, of gravitational deflection angle in plasma
from vacuum case. This angle depends on the photon frequency, what resembles
the properties of the refractive prism spectrometer. Here we consider the case
of a strong deflection angle for the light, traveling near the Schwarzschild
black hole, surrounded by a uniform plasma. Asymptotic formulae are obtained
for the case of a very large deflection angle, exceeding $2\pi$. We apply these
formulae for calculation of position and magnification of relativistic images
in a homogeneous plasma, which are formed by the photons performing one or
several revolutions around the central object. We conclude that the presence of
the uniform plasma increases the angular size of relativistic rings or the
angular separation of point images from the gravitating center. The presence of
the uniform plasma increases also a magnification of relativistic images. The
angular separation and the magnification become significantly larger than in
the vacuum case, when the photon frequency goes to a plasma frequency.


title: Prototype of time digitizing system for BESIII endcap TOF upgrade

abstract:
  The prototype of time digitizing system for the upgrade of BESIII endcap TOF
(ETOF) is introduced in this paper. The ETOF readout electronics has a
formation of distributed architecture that hit signal from multi-gap resistive
plate chamber (MRPC) is signaled as LVDS by front-end electronics (FEE) and
sent to the back-end time digitizing system via long shield differential
twisted pair cables. The ETOF digitizing system consists of 2 VME crates each
of which contains modules of time digitizing, clock, trigger and fast control
etc. The time digitizing module (TDIG) of this prototype can support up to 72
electrical channels of hit information measurement. The fast control (FCTL)
module can operate at barrel or endcap mode. The barrel FCTL fans fast control
signals from the trigger system out to endcap FCTLs, merges data from endcaps
and transfers to the trigger system. Without modifying the barrel TOF
structure, this time digitizing architecture benefits for improving ETOF
performance without degrading barrel TOF measuring. Lab experiments show that
the time resolution of this digitizing system can be less than 20ps, and the
data throughput to DAQ can be about 92Mbps. Beam experiments show that the
complete time resolution can be less than 45ps.


title: A framework for baryonic R-parity violation in grand unified theories

abstract:
  We investigate the possibility of obtaining sizeable R-parity breaking
interactions violating baryon number but not lepton number within
supersymmetric grand unified theories. Such a possibility allows to ameliorate
the naturalness status of supersymmetry while maintaining successful gauge
coupling unification, one of its main phenomenological motivations. We show
that this can be achieved without fine-tuning or the need of large
representations in simple SO(10) models.


title:
Van der Waals Interactions in Density Functional Theory by combining the
  Quantum Harmonic Oscillator-model with Localized Wannier Functions

abstract:
  We present a new scheme to include the van der Waals (vdW) interactions in
approximated Density Functional Theory (DFT) by combining the Quantum Harmonic
Oscillator model with the Maximally Localized Wannier Function technique. With
respect to the recently developed DFT/vdW-WF2 method, also based on Wannier
Functions, the new approach is more general, being no longer restricted to the
case of well separated interacting fragments. Moreover, it includes higher than
pairwise energy contributions, coming from the dipole--dipole coupling among
quantum oscillators. The method is successfully applied to the popular S22
molecular database, and also to extended systems, namely graphite and H$_2$
adsorbed on the Cu(111) metal surface (in this case metal screening effects are
taken into account). The results are also compared with those obtained by other
vdW-corrected DFT schemes.


title: Fast Laser Cooling of Long Lived Ion Beams

abstract:
  Some peculiarities of fast laser cooling of long-lived ion beams in storage
rings are discussed. Selective interaction of ions and broadband laser beam
with sharp frequency and geometric edges is used while laser and ion beams are
partially overlapped. The rates of change of the ion beam density in different
regions of the phase space and at different moments of time in this scheme of
cooling differ. That is why the generalized Robinson theorem valid for the
infinitesimal phase space regions of non exponential cooling in turn is used to
interpret the results.


title:
Transport properties of p-type metal-oxide-semiconductor inversion layer
  in (110) and (111) silicon channel under uniaxial stress

abstract:
  Valence subband and transport properties of p-type metal-oxide-semiconductor
(PMOS) inversion layer in uniaxially strained (110) and (111) Si channel have
been studied theoretically in this work. Equal energy lines, carrier
concentration effective mass, conductivity effective mass, and mobility are
calculated based on Luttinger-Kohn Hamiltonian [16]. Three compact expressions
of scattering rate are derived in this paper. The direction of applied uniaxial
stresses considered is in either parallel or perpendicular to channel. My
results show mobility is very sensitive to effective mass under different
stresses. The favorable mobility directions are found in (110) system with -3
GPa stress parallel to channel and +3 GPa stress perpendicular to channel.


title: Enhanced blind decoding of Tardos codes with new map-based functions

abstract:
  This paper presents a new decoder for probabilistic binary traitor tracing
codes under the marking assumption. It is based on a binary hypothesis testing
rule which integrates a collusion channel relaxation so as to obtain numerical
and simple accusation functions. This decoder is blind as no estimation of the
collusion channel prior to the accusation is required. Experimentations show
that using the proposed decoder gives better performance than the well-known
symmetric version of the Tardos decoder for common attack channels.


title:
Evolution of a Simple Inhomogeneous Anisotropic Cosmological Model with
  Diffusion

abstract:
  We investigate a simple inhomogeneous anisotropic cosmology (plane symmetric
$G_2$ model) filled with a tilted perfect fluid undergoing velocity diffusion
on a scalar field. Considered are two types of fluid: dust and radiation. We
solve the system of Einstein field equations and diffusion equations
numerically and demonstrate how the universe evolves towards its future
asymptotic state. Also, typical time scales of characteristic processes are
determined. The obtained results for dust- and radiation-filled cosmologies are
compared to each other and to those in the diffusionless case, giving a hint on
which effects can be the result of including diffusion in more complicated
models. For example, diffusion causes the accelerated expansion stage to arrive
at later times.


title: From semi-toric systems to Hamiltonian S^1-spaces

abstract:
  This paper studies the local and global aspects of semi-toric integrable
systems, introduced by Vu Ngoc, using ideas stemming from the theory of
Hamiltonian S^1-spaces developed by Karshon. First, we show how any labeled
convex polygon associated to a semi-toric system (as defined by Vu Ngoc)
determines Karshon's labeled directed graph which classifies the underlying
Hamiltonian S^1-space up to isomorphism. Then we characterize adaptable
semi-toric systems, i.e. those whose underlying Hamiltonian S^1-action can be
extended to an effective Hamiltonian T^2-action, as those which have at least
one associated convex polygon which satisfies the Delzant condition.


title:
Using Off-Resonance Laser Modulation for Beam Energy Spread Cooling in
  Generation of Short-Wavelength Radiation

abstract:
  Various seeding configurations have being proposed for frequency
up-conversion of the electron beam density distribution, in which the energy
spread, may however hinder the harmonic generation efficiency. In this Letter,
a method for cooling the electron beam energy spread by off-resonance seed
laser modulation is described, using a transversely dispersed beam and a
modulator undulator with proper transverse gradient. With this novel mechanism,
it is shown that the frequency up-conversion efficiency can be significantly
enhanced. We present theoretical analysis and numerical simulations for seeded
soft x-ray free electron laser and storage ring based coherent harmonic
generation in extreme ultraviolet spectral region.


title:
Formal diagonalization of the discrete Lax operators and construction of
  conserved densities and symmetries for dynamical systems

abstract:
  An alternative method of constructing the formal diagonalization for the
discrete Lax operators is proposed which can be used to calculate conservation
laws and in some cases generalized symmetries for discrete dynamical systems.
Discrete potential KdV equation, lattice derivative nonlinear Schr\"odinger
equation, dressing chain, Toda lattice are considered as illustrative examples.
For the Toda lattice on a quad graph corresponding to the Lie algebra
$A_1^{(1)}$ infinite series of conservation laws are described. Systems of quad
graph equations are represented including lattice versions of the "matrix" NLS
and "vector" derivative NLS equations.


title: A new kind of slant helix in Pseudo-Riemannian Manifolds

abstract:
  In this paper, we define a new kind of slant helix called f-eikonal
V_{n}-slant helix in Pseudo- Riemannian manifolds and give the definition of
harmonic curvature functions related to the f-eikonal V_{n}-slant helix in
Pseudo- Riemannian manifolds. Moreover, we give some characterizations of
f-eikonal V_{n}-slant helix by making use of the harmonic curvature functions.


title:
Reference cross section measurements with ALICE in pp and Pb-Pb
  collisions at LHC

abstract:
  Cross sections of reference trigger processes were obtained based on beam
property measurements in dedicated luminosity calibration experiments (van der
Meer scans). These cross-sections are essential for absolute cross section
determinations of physics processes. The reference cross sections are presented
for pp collisions at two center of mass energies; 2.76 TeV and 7 TeV, and for
Pb-Pb collisions at 2.76 TeV together with a discussion of the systematic
uncertainty originating from beam intensity and rate measurement uncertainties.

categories: nucl-ex hep-ex physics.acc-ph physics.ins-det


title: The Froissart--Martin Bound for $\pi\pi$ Scattering in QCD

abstract:
  The Froissart--Martin bound for total $\pi\pi$ scattering cross sections is
reconsidered in the light of QCD properties such as spontaneous chiral symmetry
breaking and the counting rules for a large number of colours $\Nc$.


title: Searching for the missing iron in the core of the Centaurus cluster

abstract:
  We re-analyse a combined 198 ks Chandra observation of NGC4696, the brightest
galaxy of the Centaurus cluster. We extract temperature and metallicity
profiles from the data, and we confirm the presence of a sharp drop in iron
abundance, from ~1.8 Zsolar to ~0.4 Zsolar, within the central 5 kpc of the
cluster. We estimate that this abundance drop corresponds to a total "missing"
iron mass of 1.4e06 Msolar. We propose that part of this missing iron is locked
up in cool (~19 K) far-IR emitting dust, as found by Spitzer and Herschel
observations. This can occur if the iron injected by stellar mass loss in the
central region is in grains, which remain in that form as the injected dusty
cold gas mixes and joins the cold dusty filamentary nebula observed within the
same region. The bubbling feedback process observed in the cluster core then
drags filaments outward and dumps them at 10-20 kpc radius, where the
metallicity is high.


title: Introduction to QCD sum rules

abstract:
  A general, and very basic introduction to QCD sum rules is presented, with
emphasis on recent issues to be described at length in other papers in this
volume of Modern Physics Letters A. Collectively, these papers constitute the
proceedings of the {\it{International Workshop on Determination of the
Fundamental Parameters of QCD}}, Singapore, March 2013.


title:
Evolution of ferromagnetic and spin-wave resonances with crystalline
  order in thin films of full-Heusler alloy Co2MnSi

abstract:
  We report the evolution of magnetic moment as well as magnetic anisotropy
with crystalline order in Co$_2$MnSi thin films grown on $(100)$ MgO by pulsed
laser deposition. The films become more ordered as the annealing temperature
($T_A$) increases from 400 to 600 $^0$C. The extent of \emph{L}$2_1$ ordering
in the films annealed at 600 $^0$C is $\approx 96%$. The static magnetization
measurements by vibrating sample magnetometry shows a maximum moment of 4.95
$\mu_B$ per formula unit with low coercivity ($H_C$ $\approx$ 65 Oe) in the
films annealed at 600 $^0$C. A rigorous analysis of the azimuthal and polar
angle dependent ferromagnetic resonance (FMR) measured at several temperatures
allows determination of various anisotropy fields relevant to our system as a
function of $T_A$. Finally, we have evaluated the exchange stiffness constant
down to 100 K using spin wave modes in FMR spectra. We have also estimated the
exchange energies as well as stiffness constant by varying the lattice
parameter \emph{ab-initio} using the Korringa-Kohn-Rostoker method.


title: Toroidal Quadrupole Form Factor of the Deuteron

abstract:
  We calculate the toroidal quadrupole moment and form factor of the deuteron,
which violate time-reversal symmetry but conserve parity, at leading order in
two-flavor chiral effective field theory with perturbative pion exchange. We
take into account time-reversal and parity violation due to the QCD vacuum
angle combined with parity violation resulting from the weak interaction in the
Standard Model. We also consider time-reversal and parity violation that at the
quark-gluon level results from effective dimension-six operators originating
from physics beyond the Standard Model.


title: Modelling, Reduction and Analysis of Markov Automata (extended version)

abstract:
  Markov automata (MA) constitute an expressive continuous-time compositional
modelling formalism. They appear as semantic backbones for engineering
frameworks including dynamic fault trees, Generalised Stochastic Petri Nets,
and AADL. Their expressive power has thus far precluded them from effective
analysis by probabilistic (and statistical) model checkers, stochastic game
solvers, or analysis tools for Petri net-like formalisms. This paper presents
the foundations and underlying algorithms for efficient MA modelling, reduction
using static analysis, and most importantly, quantitative analysis. We also
discuss implementation pragmatics of supporting tools and present several case
studies demonstrating feasibility and usability of MA in practice.


title:
The pumpistor: a linearized model of a flux-pumped SQUID for use as a
  negative-resistance parametric amplifier

abstract:
  We describe a circuit model for a flux-driven SQUID. This is useful for
developing insight into how these devices perform as active elements in
parametric amplifiers. The key concept is that frequency mixing in a
flux-pumped SQUID allows for the appearance of an effective negative
resistance. In the three-wave, degenerate case treated here, a negative
resistance appears only over a certain range of allowed input signal phase.
This model readily lends itself to testable predictions of more complicated
circuits.


title:
Relativistic viscous hydrodynamics for heavy-ion collisions with
  ECHO-QGP

abstract:
  We present ECHO-QGP, a numerical code for $(3+1)$-dimensional relativistic
viscous hydrodynamics designed for the modeling of the space-time evolution of
the matter created in high energy nuclear collisions. The code has been built
on top of the \emph{Eulerian Conservative High-Order} astrophysical code for
general relativistic magneto-hydrodynamics [\emph{Del Zanna et al., Astron.
Astrophys. 473, 11, 2007}] and here it has been upgraded to handle the physics
of the Quark-Gluon Plasma. ECHO-QGP features second-order treatment of causal
relativistic viscosity effects in both Minkowskian or Bjorken coordinates;
partial or complete chemical equilibrium of hadronic species before kinetic
freeze-out; initial conditions based on the optical Glauber model, including a
Monte-Carlo routine for event-by-event fluctuating initial conditions; a
freeze-out procedure based on the Cooper-Frye prescription. The code is
extensively validated against several test problems and results always appear
accurate, as guaranteed by the combination of the conservative
(shock-capturing) approach and the high-order methods employed. ECHO-QGP can be
extended to include evolution of the electromagnetic fields coupled to the
plasma.


title:
A Local Active Contour Model for Image Segmentation with Intensity
  Inhomogeneity

abstract:
  A novel locally statistical active contour model (ACM) for image segmentation
in the presence of intensity inhomogeneity is presented in this paper. The
inhomogeneous objects are modeled as Gaussian distributions of different means
and variances, and a moving window is used to map the original image into
another domain, where the intensity distributions of inhomogeneous objects are
still Gaussian but are better separated. The means of the Gaussian
distributions in the transformed domain can be adaptively estimated by
multiplying a bias field with the original signal within the window. A
statistical energy functional is then defined for each local region, which
combines the bias field, the level set function, and the constant approximating
the true signal of the corresponding object. Experiments on both synthetic and
real images demonstrate the superiority of our proposed algorithm to
state-of-the-art and representative methods.


title:
Experimental Determination of the Finite-Temperature Phase Diagram of a
  Spin-Orbit Coupled Bose Gas

abstract:
  Spin-orbit (SO) coupling has led to numerously exciting phenomena in electron
systems, for instance, the recently discovered topological insulator. The
synthesized SO coupling with ultracold neutral atoms opens a new avenue of
quantum simulation, and gives us an opportunity to study SO coupling in bosonic
systems. Indeed, SO coupling leads to many new phenomena of boson superfluidity
and various condensate phases that spontaneously break different symmetries. A
richer structure of symmetry breaking always results in a nontrivial
finite-temperature phase diagram. While the thermodynamics of the SO coupled
Bose gas at finite temperature is still unknown either in theory or experiment.
In this work, we experimentally generate the SO coupling in ultracold Rb-87 gas
to explore in a large temperature range and get most key features. We discover
a novel phase transition between the stripe ordered phase and the magnetized
phase, which is reminiscent of temperature-driven transition from the B phase
to the A phase in super- fluid Helium-3 and from spin-density-wave to spin
nematic transition in iron pnictide. We also observe that the magnetic phase
transition and the Bose condensate transition occur simultaneously as
temperature decreases. Our work determines the entire finite-temperature phase
diagram of SO coupled Bose gas and further demonstrate the power of quantum
simulation.


title: Bare Higgs mass and potential at ultraviolet cutoff

abstract:
  We first review the current status of the top mass determination paying
attention to the difference between the MS-bar and pole masses. Then we present
our recent result on the bare Higgs mass at a very high ultraviolet cutoff
scale.


title: Dienstplanerstellung in Krankenhaeusern mittels genetischer Algorithmen

abstract:
  This thesis investigates the use of problem-specific knowledge to enhance a
genetic algorithm approach to multiple-choice optimisation problems. It shows
that such information can significantly enhance performance, but that the
choice of information and the way it is included are important factors for
success.


title: Predicting the Severity of Breast Masses with Data Mining Methods

abstract:
  Mammography is the most effective and available tool for breast cancer
screening. However, the low positive predictive value of breast biopsy
resulting from mammogram interpretation leads to approximately 70% unnecessary
biopsies with benign outcomes. Data mining algorithms could be used to help
physicians in their decisions to perform a breast biopsy on a suspicious lesion
seen in a mammogram image or to perform a short term follow-up examination
instead. In this research paper data mining classification algorithms; Decision
Tree (DT), Artificial Neural Network (ANN), and Support Vector Machine (SVM)
are analyzed on mammographic masses data set. The purpose of this study is to
increase the ability of physicians to determine the severity (benign or
malignant) of a mammographic mass lesion from BI-RADS attributes and the
patient,s age. The whole data set is divided for training the models and test
them by the ratio of 70:30% respectively and the performances of classification
algorithms are compared through three statistical measures; sensitivity,
specificity, and classification accuracy. Accuracy of DT, ANN and SVM are
78.12%, 80.56% and 81.25% of test samples respectively. Our analysis shows that
out of these three classification models SVM predicts severity of breast cancer
with least error rate and highest accuracy.


title: Towards an Ontology based integrated Framework for Semantic Web

abstract:
  This Ontologies are widely used as a means for solving the information
heterogeneity problems on the web because of their capability to provide
explicit meaning to the information. They become an efficient tool for
knowledge representation in a structured manner. There is always more than one
ontology for the same domain. Furthermore, there is no standard method for
building ontologies, and there are many ontology building tools using different
ontology languages. Because of these reasons, interoperability between the
ontologies is very low. Current ontology tools mostly use functions to build,
edit and inference the ontology. Methods for merging heterogeneous domain
ontologies are not included in most tools. This paper presents ontology merging
methodology for building a single global ontology from heterogeneous eXtensible
Markup Language (XML) data sources to capture and maintain all the knowledge
which XML data sources can contain


title: QED Representation for the Net of Causal Loops

abstract:
  The present work tackles the existence of local gauge symmetries in the
setting of Algebraic Quantum Field Theory (AQFT). The net of causal loops,
previously introduced by the authors, is a model independent construction of a
covariant net of local C*-algebras on any 4-dimensional globally hyperbolic
spacetime, aimed to capture some structural properties of any reasonable
quantum gauge theory. In fact, representations of this net can be described by
causal and covariant connection systems, and the local gauge transformations
arise as maps between equivalent connection systems. The present paper
completes these abstract results, realizing QED as a representation of the net
of causal loops in Minkowski spacetime. More precisely, we map the quantum
electromagnetic field F{\mu}{\nu}, not free in general, into a representation
of the net of causal loops and show that the corresponding connection system
and local gauge transformations find a counterpart in terms of F{\mu}{\nu}.


title: Is there an unaccounted excess Extragalactic Cosmic Radio Background?

abstract:
  Analyses of measurements of the distribution of absolute brightness
temperature over the radio sky have led recently to suggestions that there
exists a substantial unexplained extragalactic radio background. Consequently,
there have been numerous attempts to place constraints on plausible origins for
the `excess'. We suggest here this expectation of a large extragalactic
background, over and above that contributed by the sources observed in the
surveys, is based on an extremely simple geometry adopted to model the Galactic
emission and the procedure adopted in the estimation of the extragalactic
contribution. In this paper, we derive the extragalactic radio background from
wide-field radio images by using a more realistic modeling of the Galactic
emission and decompose the sky maps at 150, 408, and 1420 MHz into anisotropic
Galactic and isotropic extragalactic components. The anisotropic Galactic
component is assumed to arise from a highly flattened spheroid representing the
thick disc, embedded in a spherical halo, both centered at the Galactic center,
along with Galactic sources, filamentary structures, Galactic loops and spurs.
All components are constrained to be positive and the optimization scheme
minimizes the sky area occupied by the complex filaments. We show that in
contrast to the simple modeling of the Galactic emission as a plane parallel
slab, the more realistic modeling yields estimates for the uniform
extragalactic brightness that is consistent with expectations from known
extragalactic radio source populations.


title: Entanglement witnessing in superconducting beamsplitters

abstract:
  We analyse a large class of superconducting beamsplitters for which the Bell
parameter (CHSH violation) is a simple function of the spin detector
efficiency. For these superconducting beamsplitters all necessary information
to compute the Bell parameter can be obtained in Y-junction setups for the
beamsplitter. Using the Bell parameter as an entanglement witness, we propose
an experiment which allows to verify the presence of entanglement in Cooper
pair splitters.


title: Reply to "Comments on Origin of cosmic magnetic fields"

abstract:
  In "L. Campanelli, arXiv:1304.6534 [astro-ph.CO]", we have shown that cosmic
magnetic fields are a natural consequence of inflation. Our results have been
criticized in the recent comment "R. Durrer, G. Marozzi and M. Rinaldi,
arXiv:1305.3192 [astro-ph.CO]." We show that the arguments raised against the
validity of our results are physically and mathematically unfounded.


title:
Time resolved measurement of film growth during reactive high power
  pulsed magnetron sputtering (HIPIMS) of titanium nitride

abstract:
  The growth rate during reactive high power pulsed magnetron sputtering
(HIPIMS) of titanium nitride is measured with a temporal resolution of up to 25
us using a rotating shutter concept. According to that concept a 200 um slit is
rotated in front of the substrate synchronous with the HIPIMS pulses. Thereby,
the growth flux is laterally distributed over the substrate. By measuring the
resulting deposition profile with profilometry and with x-ray photoelectron
spectroscopy, the temporal variation of the titanium and nitrogen growth flux
per pulse is deduced. The analysis reveals that film growth occurs mainly
during a HIPIMS pulse, with the growth rate following the HIPIMS phases
ignition, current rise, gas rarefaction, plateau and afterglow. The growth
fluxes of titanium and nitrogen follow slightly different behaviors with
titanium dominating at the beginning of the HIPIMS pulse and nitrogen at the
end of the pulse. This is explained by the gas rarefaction effect resulting in
a dense initial metal plasma and metal films which are subsequently being
nitrified.


title: Interpolating Sequences for analytic selfmappings of the disc

abstract:
  Schwarz's Lemma leads to a natural interpolation problem for analytic
functions from the disc into itself. The corresponding interpolating sequences
are geometrically described in terms of a certain hyperbolic density.


title:
Biharmonic maps from a complete Riemannian manifold into a
  non-positively curved manifold

abstract:
  We consider biharmonic maps $\phi:(M,g)\rightarrow (N,h)$ from a complete
Riemannian manifold into a Riemannian manifold with non-positive sectional
curvature. Assume that $\alpha$ satisfies $1<\alpha<\infty$. If for such an
$\alpha$, $\int_M|\tau(\phi)|^{\alpha}dv_g<\infty$ and
$\int_M|d\phi|^2dv_g<\infty,$ where $\tau(\phi)$ is the tension field of
$\phi$, then we show that $\phi$ is harmonic. For a biharmonic submanifold, we
obtain that the above assumption $\int_M|d\phi|^2dv_g<\infty$ is not necessary.
These results give affirmative partial answers to the global version of
generalized Chen's conjecture.


title: A General Reciprocity Law for Symbols on Arbitrary Vector Spaces

abstract:
  The aim of this work is to offer a general theory of reciprocity laws for
symbols on arbitrary vector spaces, and to show that classical explicit
reciprocity laws are particular cases of this theory (sum of valuations on a
complete curve, Residue Theorem, Weil Reciprocity Law and the Reciprocity Law
for the Hilbert Norm Residue Symbol). Moreover, several reciprocity laws
introduced over the past few years by D. V. Osipov, A. N. Parshin, I. Horozov,
I. Horozov - M. Kerr and the author -together with D. Hern\'andez Serrano-, can
also be deduced from this general expression.


title: One year of monitoring of the Type IIb supernova SN 2011dh

abstract:
  Optical $UBVRI$ photometry and low resolution spectroscopy of the type IIb
supernova SN 2011dh in M51 are presented, covering the first year after the
explosion. The light curve and spectral evolution are discussed. The early
phase light curve evolution of SN 2011dh is very similar to SN 1993J and SN
2008ax. In the late phase, however, SN 2011dh declines faster than SN 1993J.
The late phase decline in the $B$-band is steeper than in the $R$ and $I$
bands, indicating the possibility of dust formation. With a peak $V$-band
absolute magnitude of $M_V = -17.123\pm0.18$ mag, SN 2011dh is a marginally
faint type IIb event. The reddening corrected colour curves of SN 2011dh are
found to be redder than other well studied type IIb supernovae. The bolometric
light curve indicates $\sim$ 0.09 M$_\odot$ of $^{56}$Ni is synthesized during
the explosion. The HeI lines were detected in the spectra during the rise to
maximum. The nebular spectra of SN 2011dh show a box shaped emission in the red
wing of the [OI] 6300-6363 \AA\ feature, that is attributed to H$\alpha$
emission from a shock excited circumstellar material. The analysis of nebular
spectra indicates that $\sim 0.2$ M$_\odot$ of oxygen was ejected during the
explosion. Further, the [CaII]/[OI] line ratio in the nebular phase is $\sim$
0.7, indicating a progenitor with a main sequence mass of 10-15 M$_\odot$.


title:
Using structural and evolutionary information to detect and correct
  pyrosequencing errors in non-coding RNAs

abstract:
  Analysis of the sequence-structure relationship in RNA molecules are
essential to evolutionary studies but also to concrete applications such as
error-correction methodologies in sequencing technologies. The prohibitive
sizes of the mutational and conformational landscapes combined with the volume
of data to proceed require efficient algorithms to compute sequence-structure
properties. More specifically, here we aim to calculate which mutations
increase the most the likelihood of a sequence to a given structure and RNA
family. In this paper, we introduce RNApyro, an efficient linear-time and space
inside-outside algorithm that computes exact mutational probabilities under
secondary structure and evolutionary constraints given as a multiple sequence
alignment with a consensus structure. We develop a scoring scheme combining
classical stacking base pair energies to novel isostericity scales, and apply
our techniques to correct point-wise errors in 5s and 16s rRNA sequences. Our
results suggest that RNApyro is a promising algorithm to complement existing
tools in the NGS error-correction pipeline.


title: Single-pixel digital "ghost" holography

abstract:
  Since its discovery, the "ghost" diffraction phenomenon has emerged as a
non-conventional technique for optical imaging with very promising advantages.
However, extracting intensity and phase information of a structured and
realistic object remains a challenge. Here, we show that a "ghost" hologram can
be recorded with a single-pixel configuration by adapting concepts from
standard digital holography. The presented homodyne scheme enables phase
imaging with nanometric depth resolution, three-dimensional focusing ability,
and shows high signal-to-noise ratio.


title: Viewpoint: Toward Fractional Quantum Hall physics with cold atoms

abstract:
  Viewpoint on Nigel R. Cooper and Jean Dalibard, "Reaching Fractional Quantum
Hall States with Optical Flux Lattices", Phys. Rev. Lett. 110, 185301 (2013),
and N. Y. Yao, A. V. Gorshkov, C. R. Laumann, A. M. L\"auchli, J. Ye, and M. D.
Lukin, "Realizing Fractional Chern Insulators in Dipolar Spin Systems", Phys.
Rev. Lett. 110, 185302 (2013).
  Researchers propose new ways to recreate fractional quantum Hall physics
using ultracold atoms and molecules.


title:
Simulation of magnetic active polymers for versatile microfluidic
  devices

abstract:
  We propose to use a compound of magnetic nanoparticles (20-100 nm) embedded
in a flexible polymer (Polydimethylsiloxane PDMS) to filter circulating tumor
cells (CTCs). The analysis of CTCs is an emerging tool for cancer biology
research and clinical cancer management including the detection, diagnosis and
monitoring of cancer. The combination of experiments and simulations lead to a
versatile microfluidic lab-on-chip device. Simulations are essential to
understand the influence of the embedded nanoparticles in the elastic PDMS when
applying a magnetic gradient field. It combines finite element calculations of
the polymer, magnetic simulations of the embedded nanoparticles and the fluid
dynamic calculations of blood plasma and blood cells. With the use of magnetic
active polymers a wide range of tunable microfluidic structures can be created.
The method can help to increase the yield of needed isolated CTCs.

categories: physics.bio-ph cs.CE physics.comp-ph physics.flu-dyn


title: Guided self-assembly of magnetic beads for biomedical applications

abstract:
  Micromagnetic beads are widely used in biomedical applications for cell
separation, drug delivery, and hypothermia cancer treatment. Here we propose to
use self-organized magnetic bead structures which accumulate on fixed magnetic
seeding points to isolate circulating tumor cells. The analysis of circulating
tumor cells is an emerging tool for cancer biology research and clinical cancer
management including the detection, diagnosis and monitoring of cancer.
Microfluidic chips for isolating circulating tumor cells use either affinity,
size or density capturing methods. We combine multiphysics simulation
techniques to understand the microscopic behavior of magnetic beads interacting
with Nickel accumulation points used in lab-on-chip technologies. Our proposed
chip technology offers the possibility to combine affinity and size capturing
with special antibody-coated bead arrangements using a magnetic gradient field
created by Neodymium Iron Boron permanent magnets. The multiscale simulation
environment combines magnetic field computation, fluid dynamics and discrete
particle dynamics.


title:
Nonlinear Alfv\'en wave dynamics at a 2D magnetic null point:
  ponderomotive force

abstract:
  Context : In the linear, {\beta}=0 MHD regime, the transient properties of
MHD waves in the vicinity of 2D null points are well known. The waves are
decoupled and accumulate at predictable parts of the magnetic topology: fast
waves accumulate at the null point; whereas Alfv\'en waves cannot cross the
separatricies. However, in nonlinear MHD mode conversion can occur at regions
of inhomogeneous Alfv\'en speed, suggesting that the decoupled nature of waves
may not extend to the nonlinear regime. Aims: We investigate the behaviour of
low-amplitude Alfv\'en waves about a 2D magnetic null point in nonlinear,
{\beta}= 0 MHD. Methods: We numerically simulate the introduction of
low-amplitude Alfv\'en waves into the vicinity of a magnetic null point using
the nonlinear LARE2D code. Results: Unlike in the linear regime, we find that
the Alfv\'en wave sustains cospatial daughter disturbances, manifest in the
transverse and longitudinal fluid velocity, owing to the action of nonlinear
magnetic pressure gradients (viz. the ponderomotive force). These disturbances
are dependent on the Alfv\'en wave and do not interact with the medium to
excite magnetoacoustic waves, although the transverse daughter becomes focused
at the null point. Additionally, an independently propagating fast
magnetoacoustic wave is generated during the early stages, which transports
some of the initial Alfv\'en wave energy towards the null point. Subsequently,
despite undergoing dispersion and phase-mixing due to gradients in the
Alfv\'en-speed profile (Grad c_A \neq 0) there is no further nonlinear
generation of fast waves. Conclusions: We find that Alfv\'en waves at 2D cold
null points behave largely as in the linear regime, however they sustain
transverse and longitudinal disturbances - effects absent in the linear regime
- due to nonlinear magnetic pressure gradients.

categories: astro-ph.SR physics.flu-dyn physics.geo-ph physics.plasm-ph


title:
Machine Learning of Molecular Electronic Properties in Chemical Compound
  Space

abstract:
  The combination of modern scientific computing with electronic structure
theory can lead to an unprecedented amount of data amenable to intelligent data
analysis for the identification of meaningful, novel, and predictive
structure-property relationships. Such relationships enable high-throughput
screening for relevant properties in an exponentially growing pool of virtual
compounds that are synthetically accessible. Here, we present a machine
learning (ML) model, trained on a data base of \textit{ab initio} calculation
results for thousands of organic molecules, that simultaneously predicts
multiple electronic ground- and excited-state properties. The properties
include atomization energy, polarizability, frontier orbital eigenvalues,
ionization potential, electron affinity, and excitation energies. The ML model
is based on a deep multi-task artificial neural network, exploiting underlying
correlations between various molecular properties. The input is identical to
\emph{ab initio} methods, \emph{i.e.} nuclear charges and Cartesian coordinates
of all atoms. For small organic molecules the accuracy of such a "Quantum
Machine" is similar, and sometimes superior, to modern quantum-chemical
methods---at negligible computational cost.


title: Torsion pendulum revisited

abstract:
  We present an analysis of the motion of a simple torsion pendulum and we
describe how, with straightforward extensions to the usual basic dynamical
model, we succeed in explaining some unexpected features we found in our data,
like the modulation of the torsion mode at a higher frequency and the frequency
splitting of the swinging motion. Comparison with observed values yields
estimates for the misalignment angles and other parameters of the model.


title: Firefighting on square, hexagonal, and triangular grids

abstract:
  In this paper, we consider the \emph{firefighter problem} on a graph
$G=(V,E)$ that is either finite or infinite. Suppose that a fire breaks out at
a given vertex $v \in V$. In each subsequent time unit, a firefighter protects
one vertex which is not yet on fire, and then the fire spreads to all
unprotected neighbors of the vertices on fire. The objective of the firefighter
is to save as many vertices as possible (if $G$ is finite) or to stop the fire
from spreading (for an infinite case).
  The surviving rate $\rho(G)$ of a finite graph $G$ is defined as the expected
percentage of vertices that can be saved when a fire breaks out at a vertex of
$G$ that is selected uniformly random. For a finite square grid $P_n \square
P_n$, we show that $5/8 + o(1) \le \rho(P_n \square P_n) \le 67243/105300 +
o(1)$ (leaving the gap smaller than 0.014) and conjecture that the surviving
rate is asymptotic to 5/8.
  We define the surviving rate for infinite graphs and prove it to be 1/4 for
the infinite square grid, even in the case of finitely many initial fires. For
the infinite hexagonal grid we provide a winning strategy if two additional
vertices can be protected at any point of the process, and we conjecture that
the firefighter has no strategy to stop the fire without additional help. We
also show how the speed of the spreading fire can be reduced by a constant
factor.


title: A short proof of the Fundamental Theorem of Algebra

abstract:
  D'Alembert made the first serious attempt to prove the Fundamental Theorem of
Algebra (FTA) in 1746. An elementary proof of (FTA) based on the same idea is
given in Proofs from THE BOOK. We give a shorter and more transperant version
of this proof.


title:
A simple formula for the third integral of motion of disk-crossing stars
  in the Galaxy

abstract:
  We present an analytical simple formula for an approximated third integral of
motion associated with nearly equatorial orbits in the Galaxy:
$I_{3}=Z\Sigma_{I}^{1/3}$, where $Z(R)$ is the vertical amplitude of the orbit
at galactocentric distance $R$ and $\Sigma_{I}(R)$ is the integrated dynamical
surface mass density of the disk, a quantity which has recently become
measurable. We also suggest that this relation is valid for disk-crossing
orbits in a wide variety of axially symmetric galactic models, which range from
razor-thin disks to disks with non-negligible thickness, whether or not the
system includes bulges and halos. We apply our formalism to a Miyamoto-Nagai
model and to a realistic model for the Milky Way. In both cases, the results
provide fits for the shape of nearly equatorial orbits which are better than
the corresponding curves obtained by the usual adiabatic approximation when the
orbits have vertical amplitudes comparable to the disk's scale height. We also
discuss the role of this approximate third integral of motion in modified
theories of gravity.


title:
On retardation, radiation and Li\'enard-Wiechert type potentials in
  electrodynamics and elastodynamics

abstract:
  The aim of this paper is to investigate the fundamental problems of
retardation and radiation caused by non-uniformly moving point sources using
the theories of electrodynamics and elastodynamics. This paper investigates and
compares the retarded electromagnetic fields and the retarded elastodynamic
fields. For the non-uniform motion of a general point source, the
Li\'enard-Wiechert type potentials and the radiation and nonradiation fields
are derived for a point charge and for a point force.

categories: physics.class-ph cond-mat.mtrl-sci math-ph math.MP


title:
Maximal Chains of Isomorphic Subgraphs of Countable Ultrahomogeneous
  Graphs

abstract:
  For a countable ultrahomogeneous graph G let P(G) denote the collection of
domains of subgraphs of G isomorphic to G. The order types of maximal chains in
the set P(G) U {\o} ordered by the inclusion are characterized as:
  (I) the order types of compact sets of reals having the minimum non-isolated,
if G is the Rado graph or the Henson graph H_n, for some n>2;
  (II) the order types of compact nowhere dense sets of reals having the
minimum non-isolated, if G is the union of \mu disjoint complete graphs of size
\nu, where \mu \nu =\omega .


title:
Space charge and collective oscillation of ion cloud in a linear Paul
  trap

abstract:
  The presence of charged particles in an ion trap modifies the harmonic
trapping potential in which they are trapped, leading to observed shifts in
secular frequency as well as appearance of collective oscillation. In a linear
trap geometry, both of these effects have been observed under different
trapping conditions using narrow non-linear resonance and external excitation.
The observations have been modeled with minimal fitting parameter showing good
agreement with results obtained. The space charge in our experiment plays an
important role in terms of criticality of the onset of collective oscillation.


title:
Ultrahigh refractive index sensitivity of TE-polarized electromagnetic
  waves in graphene at the interface between two dielectric media

abstract:
  The behavior of the TE and TM electromagnetic waves in graphene at the
interface between two semi-infinite dielectric media is studied. The dramatic
influence on the TE waves propagation even at very small changes in the optical
contrast between the two dielectric media is predicted. Frequencies of the TE
waves are found to lie only in the window determined by the contrast. We
consider this effect in connection with the design of graphene-based optical
gas sensor. Near the frequency, where the imaginary part of the conductivity of
graphene becomes zero, ultrahigh refractive index sensitivity and very low
detection limit are revealed. The considered graphene-based optical gas sensor
outperforms characteristics of modern volume refractive index sensors by
several orders of magnitude.


title:
Density Operator Description of Atomic Ordered Spatial Modes in Cavity
  QED

abstract:
  We present a quantum Monte-Carlo simulation for a pumped atom in a strong
coupling cavity with dissipation, where two ordered spatial modes are formed
for the atomic probability density, with the peaks distributed either only in
the odd sites or only in the even ones of the lattice formed by the cavity
field. A mixed state density operator model, which describes the coupling
between different atomic spatial modes and the corresponding cavity field
components, is proposed, which goes beyond the pure state interpretation. We
develop a new decomposition treatment to derive the atomic spatial modes as
well as the cavity field statistics from the simulation results for the steady
state. With this treatment, we also investigate the dynamical process for the
probabilities of the atomic spatial modes in the adiabatic limit. According to
the analysis of the fitting error between the simulation results and the
density operator model, the latter is a good description for the system.


title: Systematic investigation of THz-induced excitonic Rabi splitting

abstract:
  Weak near-infrared and strong terahertz excitation are applied to study
excitonic Rabi splitting in (GaIn)As/GaAs quantum wells. Pronounced
anticrossing behavior of the split peaks is observed for different terahertz
intensities and detunings relative to the intraexcitonic heavy-hole
1s-2p-transition. At intermediate to high electric fields the splitting becomes
highly asymmetric and exhibits significant broadening. A fully microscopic
theory is needed to explain the experimental results. Comparisons with a
two-level model reveal the increasing importance of higher excitonic states at
elevated excitation levels.


title: Model-free control

abstract:
  "Model-free control" and the corresponding "intelligent" PID controllers
(iPIDs), which already had many successful concrete applications, are presented
here for the first time in an unified manner, where the new advances are taken
into account. The basics of model-free control is now employing some old
functional analysis and some elementary differential algebra. The estimation
techniques become quite straightforward via a recent online parameter
identification approach. The importance of iPIs and especially of iPs is
deduced from the presence of friction. The strange industrial ubiquity of
classic PID's and the great difficulty for tuning them in complex situations is
deduced, via an elementary sampling, from their connections with iPIDs. Several
numerical simulations are presented which include some infinite-dimensional
systems. They demonstrate not only the power of our intelligent controllers but
also the great simplicity for tuning them.


title:
On a 2D stochastic Euler equation of transport type: existence and
  geometric formulation

abstract:
  We prove weak existence of Euler equation (or Navier-Stokes equation)
perturbed by a multiplicative noise on bounded domains of $\mathbb R^2$ with
Dirichlet boundary conditions and with periodic boundary conditions. Solutions
are $H^1$ regular. The equations are of transport type.


title:
Stochastic conservation laws: weak-in-time formulation and strong
  entropy condition

abstract:
  This article is an attempt to complement some recent developments on
conservation laws with stochastic forcing. In a pioneering development, Feng
$&$ Nualarthave developed the entropy solution theory for such problems and the
presence of stochastic forcing necessitates introduction of {\it strong entropy
condition}. However, the authors' formulation of entropy inequalities are
weak-in-space but strong-in-time. In the absence of a-priori path continuity
for the solutions, we take a critical outlook towards this formulation and
offer an entropy formulation which is weak-in-time and weak-in-space.


title:
Single-top $t$-channel production with off-shell and non-resonant
  effects

abstract:
  This letter details and discusses the next-to-leading order QCD corrections
to $t$-channel electro-weak $W^+ b j$ production, where finite top-width
effects are consistently taken into account. The computation is done within the
aMC@NLO framework and includes both resonant and non-resonant contributions as
well as interferences between the two. Results are presented for the LHC and
compared to those of the narrow-width approximation and effective theory
approaches.


title:
Absence of anomalous dissipation of energy in forced two dimensional
  fluid equations

abstract:
  We prove absence of anomalous dissipation of energy for forced critical SQG
in two space dimensions.


title:
Sodium content as a predictor of the advanced evolution of globular
  cluster stars

abstract:
  The asymptotic giant branch (AGB) phase is the final stage of nuclear burning
for low-mass stars. Although Milky Way globular clusters are now known to
harbour (at least) two generations of stars they still provide relatively
homogeneous samples of stars that are used to constrain stellar evolution
theory. It is predicted by stellar models that the majority of cluster stars
with masses around the current turn-off mass (that is, the mass of the stars
that are currently leaving the main sequence phase) will evolve through the AGB
phase. Here we report that all of the second-generation stars in the globular
cluster NGC 6752 -- 70 per cent of the cluster population -- fail to reach the
AGB phase. Through spectroscopic abundance measurements, we found that every
AGB star in our sample has a low sodium abundance, indicating that they are
exclusively first-generation stars. This implies that many clusters cannot
reliably be used for star counts to test stellar evolution timescales if the
AGB population is included. We have no clear explanation for this observation.


title:
A double species $^{23}$Na and $^{87}$Rb Bose-Einstein condensate with
  tunable miscibility via an interspecies Feshbach resonance

abstract:
  We have realized a dual-species Bose-Einstein condensate (BEC) of $^{23}$Na
and $^{87}$Rb atoms and observed their immiscibility. Because of the favorable
background intra- and inter-species scattering lengths, stable condensates can
be obtained via efficient evaporative cooling and sympathetic cooling without
the need for fine tuning of the interactions. Our system thus provides a clean
platform for studying inter-species interactions driven effects in superfluid
mixtures. With a Feshbach resonance, we have successfully created double BECs
with largely tunable inter-species interactions and studied the
miscible-immiscible phase transition.


title: Prices and Asymptotics for Discrete Variance Swaps

abstract:
  We study the fair strike of a discrete variance swap for a general
time-homogeneous stochastic volatility model. In the special cases of Heston,
Hull-White and Schobel-Zhu stochastic volatility models we give simple explicit
expressions (improving Broadie and Jain (2008a) in the case of the Heston
model). We give conditions on parameters under which the fair strike of a
discrete variance swap is higher or lower than that of the continuous variance
swap. The interest rate and the correlation between the underlying price and
its volatility are key elements in this analysis. We derive asymptotics for the
discrete variance swaps and compare our results with those of Broadie and Jain
(2008a), Jarrow et al. (2013) and Keller-Ressel and Griessler (2012).


title:
Complex patterns arise through spontaneous symmetry breaking in dense
  homogeneous networks of neural oscillators

abstract:
  Recent experiments have highlighted how collective dynamics in networks of
brain regions affect behavior and cognitive function. In this paper we show
that a simple, homogeneous system of densely connected oscillators representing
the aggregate activity of local brain regions can exhibit a rich variety of
dynamical patterns emerging via spontaneous breaking of permutation or
translational symmetry. Our results connect recent experimental findings and
suggest that a range of complicated activity patterns seen in the brain could
be explained even without a full knowledge of its wiring diagram.


title: NSVZ scheme with the higher derivative regularization for N=1 SQED

abstract:
  The exact NSVZ relation between a $\beta$-function of ${\cal N}=1$ SQED and
an anomalous dimension of the matter superfields is studied within the Slavnov
higher derivative regularization approach. It is shown that if the
renormalization group functions are defined in terms of the bare coupling
constant, this relation is always valid. In the renormalized theory the NSVZ
relation is obtained in the momentum subtraction scheme supplemented by a
special finite renormalization. Unlike the dimensional reduction, the higher
derivative regularization allows to fix this finite renormalization. This is
made by imposing the conditions $Z_3(\alpha,\mu=\Lambda)=1$ and
$Z(\alpha,\mu=\Lambda)=1$ on the renormalization constants of ${\cal N}=1$
SQED, where $\Lambda$ is a parameter in the higher derivative term. The results
are verified by the explicit three-loop calculation. In this approximation we
relate the $\bar{{DR}}$ scheme and the NSVZ scheme defined within the higher
derivative approach by the finite renormalization.


title:
Electrical spin injection into graphene through monolayer hexagonal
  boron nitride

abstract:
  We demonstrate electrical spin injection from a ferromagnet to a bilayer
graphene (BLG) through a monolayer (ML) of single-crystal hexagonal boron
nitride (h-BN). A Ni81Fe19/ML h-BN/BLG/h-BN structure is fabricated using a
micromechanical cleavage and dry transfer technique. The transport properties
across the ML h-BN layer exhibit tunnel barrier characteristics. Spin injection
into BLG has been detected through non local magnetoresistance measurements.


title: Anomalous $tq\gamma$ couplings in $\gamma p$ collision at the LHC

abstract:
  We have examined the constraints on the anomalous $tq\gamma$ ($q=u,c$)
couplings through the process $pp\to p\gamma p\to pWbX$ at the LHC by
considering three forward detector acceptances: $0.0015< \xi < 0.5$, $0.0015<
\xi <0.15$ and $0.1< \xi < 0.5$. The sensitivity bounds on the anomalous
couplings have been obtained at the $95%$ confidence level in a model
independent effective lagrangian approach. We have found that the bounds on
these couplings can be highly improved compared to current experimental bounds.


title: Commutative Families of the Elliptic Macdonald Operator

abstract:
  In the paper [J. Math. Phys. 50 (2009), 095215, 42 pages, arXiv:0904.2291],
Feigin, Hashizume, Hoshino, Shiraishi, and Yanagida constructed two families of
commuting operators which contain the Macdonald operator (commutative families
of the Macdonald operator). They used the Ding-Iohara-Miki algebra and the
trigonometric Feigin-Odesskii algebra. In the previous paper [arXiv:1301.4912],
the present author constructed the elliptic Ding-Iohara-Miki algebra and the
free field realization of the elliptic Macdonald operator. In this paper, we
show that by using the elliptic Ding-Iohara-Miki algebra and the elliptic
Feigin-Odesskii algebra, we can construct commutative families of the elliptic
Macdonald operator. In Appendix, we will show a relation between the elliptic
Macdonald operator and its kernel function by the free field realization.


title: Photometric and spectroscopic variations of the Be star HD 112999

abstract:
  Be objects are stars of B spectral type showing lines of the Balmer series in
emission. The presence of these lines is attributed to the existence of an
extended envelope, disk type, around them. Some stars are observed in both the
Be and normal B-type spectroscopic states and they are known as transient Be
stars. In this paper we show the analysis carried out on a new possible
transient Be star, labelled HD 112999, using spectroscopic optical observations
and photometric data.


title:
Accurate bottom-quark mass from Borel QCD sum rules for $f_B$ and
  $f_{B_s}$

abstract:
  We prove that Borel QCD sum rules for heavy-light currents yield very strong
correlations between the $b$-quark mass $m_b$ and the $B$-meson decay constant
$f_B$, namely, $\delta f_B/f_B\approx -8\,\delta m_b/m_b$. This fact opens the
possibility of an accurate sum-rule extraction of $m_b$ by using $f_B$ as
input. Combining precise lattice QCD determinations of $f_B$ with our sum-rule
analysis based on the three-loop $O(\alpha_s^2)$ heavy-light correlation
function leads to $\bar{m}_b(\bar{m}_b)=(4.247\pm0.034)\;\mbox{GeV}$.


title: Maps preserving peripheral spectrum of generalized products of operators

abstract:
  Let $\mathcal{A}_1$ and $\mathcal{A}_2$ be standard operator algebras on
complex Banach spaces $X_1$ and $X_2$, respectively. For $k\geq2$, let
$(i_1,...,i_m)$ be a sequence with terms chosen from $\{1,\ldots,k\}$, and
assume that at least one of the terms in $(i_1,\ldots,i_m)$ appears exactly
once. Define the generalized product $T_1* T_2*\cdots* T_k=T_{i_1}T_{i_2}\cdots
T_{i_m}$ on elements in $\mathcal{A}_i$. Let
$\Phi:\mathcal{A}_1\rightarrow\mathcal{A}_2$ be a map with the range containing
all operators of rank at most two. We show that $\Phi$ satisfies that
$\sigma_\pi(\Phi(A_1)*\cdots*\Phi(A_k))=\sigma_\pi(A_1*\cdots* A_k)$ for all
$A_1,\ldots, A_k$, where $\sigma_\pi(A)$ stands for the peripheral spectrum of
$A$, if and only if $\Phi$ is an isomorphism or an anti-isomorphism multiplied
by an $m$th root of unity, and the latter case occurs only if the generalized
product is quasi-semi Jordan. If $X_1=H$ and $X_2=K$ are complex Hilbert
spaces, we characterize also maps preserving the peripheral spectrum of the
skew generalized products, and prove that such maps are of the form $A\mapsto
cUAU^*$ or $A\mapsto cUA^tU^*$, where $U\in\mathcal{B}(H,K)$ is a unitary
operator, $c\in\{1,-1\}$.


title: Neutron Skins and Neutron Stars

abstract:
  The neutron-skin thickness of heavy nuclei provides a fundamental link to the
equation of state of neutron-rich matter, and hence to the properties of
neutron stars. The Lead Radius Experiment ("PREX") at Jefferson Laboratory has
recently provided the first model-independence evidence on the existence of a
neutron-rich skin in 208Pb. In this contribution we examine how the increased
accuracy in the determination of neutron skins expected from the commissioning
of intense polarized electron beams may impact the physics of neutron stars.


title:
Realising high-dimensional quantum entanglement with orbital angular
  momentum

abstract:
  We report the first quantum entanglement experiment in South Africa. The
spatial modes of the entangled photon pair are investigated with their
potential for high-dimensional entanglement. The generation, measurement and
characterisation of the entangled states are examined in detail, where we show
high-dimensional entanglement in a Hilbert space of dimension 25. We highlight
the experimental challenges contained within each step and provide practical
techniques for future experiments in the quantum regime.


title:
Fault-tolerant multipath routing scheme for energy efficient wireless
  sensor networks

abstract:
  The main challenge in wireless sensor network is to improve the fault
tolerance of each node and also provide an energy efficient fast data routing
service. In this paper we propose an energy efficient node fault diagnosis and
recovery for wireless sensor networks referred as fault tolerant multipath
routing scheme for energy efficient wireless sensor network (FTMRS).The FTMRS
is based on multipath data routing scheme. One shortest path is use for main
data routing in FTMRS technique and other two backup paths are used as
alternative path for faulty network and to handle the overloaded traffic on
main channel. Shortest path data routing ensures energy efficient data routing.
The performance analysis of FTMRS shows better results compared to other
popular fault tolerant techniques in wireless sensor networks.


title: Fermion's tunnelling with effects of quantum gravity

abstract:
  In this paper, using Hamilton-Jacobi method, we address the tunnelling of
fermions in a 4-dimensional Schwarzschild spacetime. Base on the generalized
uncertainty principle, we introduce the influence of quantum gravity. After
solving the equation of motion of the spin 1/2 field, we derive the corrected
Hawking temperature. It turns out that the correction depends not only on the
black hole's mass but also on the mass (energy) of emitted fermions. It is of
interest that, in our calculation, the quantum gravity correction decelerates
the temperature increase during the radiation explicitly. This observation then
naturally leads to the remnants in black hole evaporation. Our calculation
shows that the residue mass is $\gtrsim M_p/\beta_0$, where $M_p$ is the Planck
mass and $\beta_0$ is a dimensionless parameter accounting for quantum gravity
effects. The evaporation singularity is then avoided.