title: Spectroscopy of triply-charmed baryons from lattice QCD

abstract:
  The spectrum of excitations of triply-charmed baryons is computed using
lattice QCD including dynamical light quark fields. Calculations are performed
on anisotropic lattices with temporal and spatial spacings a_t = 0.0351(2) and
a_s ~ 0.12 fm respectively and with pion mass of about 390 MeV. The spectrum
obtained has baryonic states with well-defined total spin up to 7/2 and the
low-lying states closely resemble the expectation from models with an SU(6)X
O(3) symmetry. Energy splittings between extracted states, including those due
to spin-orbit coupling in the heavy quark limit are computed and compared
against data at other quark masses.


title:
Weak and strong singular solutions of semilinear fractional elliptic
  equations

abstract:
  Let $p\in(0,\frac{N}{N-2\alpha})$, $\alpha\in(0,1)$ and $\Omega\subset \R^N$
be a bounded $C^2$ domain containing $0$. If $\delta_0$ is the Dirac measure at
$0$ and $k>0$, we prove that the weakly singular solution $u_k$ of $(E_k)$ $
(-\Delta)^\alpha u+u^p=k\delta_0 $ in $\Omega$ which vanishes in $\Omega^c$, is
a classical solution of $(E_*)$ $ (-\Delta)^\alpha u+u^p=0 $ in
$\Omega\setminus\{0\}$ with the same outer data. When
$\frac{2\alpha}{N-2\alpha}\leq 1+\frac{2\alpha}{N}$, $p\in(0,
1+\frac{2\alpha}{N}]$ we show that the $u_k$ converges to $\infty$ in whole
$\Omega$ when $k\to\infty$, while, for
$p\in(1+\frac{2\alpha}N,\frac{N}{N-2\alpha})$, the limit of the $u_k$ is a
strongly singular solution of $(E_*)$. The same result holds in the case
$1+\frac{2\alpha}{N}<\frac{2\alpha}{N-2\alpha}$ excepted if $\frac{2\alpha}{N}


title: Multi-view Laplacian Support Vector Machines

abstract:
  We propose a new approach, multi-view Laplacian support vector machines
(SVMs), for semi-supervised learning under the multi-view scenario. It
integrates manifold regularization and multi-view regularization into the usual
formulation of SVMs and is a natural extension of SVMs from supervised learning
to multi-view semi-supervised learning. The function optimization problem in a
reproducing kernel Hilbert space is converted to an optimization in a
finite-dimensional Euclidean space. After providing a theoretical bound for the
generalization performance of the proposed method, we further give a
formulation of the empirical Rademacher complexity which affects the bound
significantly. From this bound and the empirical Rademacher complexity, we can
gain insights into the roles played by different regularization terms to the
generalization performance. Experimental results on synthetic and real-world
data sets are presented, which validate the effectiveness of the proposed
multi-view Laplacian SVMs approach.


title: The ZX-calculus is complete for stabilizer quantum mechanics

abstract:
  The ZX-calculus is a graphical calculus for reasoning about quantum systems
and processes. It is known to be universal for pure state qubit quantum
mechanics, meaning any pure state, unitary operation and post-selected pure
projective measurement can be expressed in the ZX-calculus. The calculus is
also sound, i.e. any equality that can be derived graphically can also be
derived using matrix mechanics. Here, we show that the ZX-calculus is complete
for pure qubit stabilizer quantum mechanics, meaning any equality that can be
derived using matrices can also be derived pictorially. The proof relies on
bringing diagrams into a normal form based on graph states and local Clifford
operations.


title:
A comparison of structure formation in minimally and non-minimally
  coupled quintessence models

abstract:
  We study structure formation in non-minimally coupled dark energy models,
where there is a coupling in the Lagrangian between a quintessence scalar field
and gravity via the Ricci scalar. We consider models with a range of different
non-minimal coupling strengths and compare these to minimally coupled
quintessence models with time-dependent dark energy densities. The equations of
state of the latter are tuned to either reproduce the equation of state of the
non-minimally coupled models or their background history. Thereby they provide
a reference to study the unique imprints of coupling on structure formation. We
show that the coupling between gravity and the scalar field, which effectively
results in a time-varying gravitational constant G, is not negligible and its
effect can be distinguished from a minimally coupled model. We extend previous
work on this subject by showing that major differences appear in the
determination of the mass function at high masses, where we observe differences
of the order of 40% at z=0. Our new results concern effects on the non-linear
matter power spectrum and on the lensing signal (differences of ~10% for both
quantities), where we find that non-minimally coupled models could be
distinguished from minimally coupled ones.


title: Self-Consistent Projection Operator Theory for Quantum Many-Body Systems

abstract:
  We derive an exact equation of motion for the reduced density matrices of
individual subsystems of quantum many-body systems of any lattice dimension and
arbitrary system size. Our projection operator based theory yields a highly
efficient analytical and numerical approach. Besides its practical use it
provides a novel interpretation and systematic extension of mean-field
approaches and an adaption of open quantum systems theory to settings where a
dynamically evolving environment has to be taken into account. We show its high
accuracy for two significant classes of complex quantum many-body dynamics,
unitary evolutions of non-equilibrium states in closed and stationary states in
driven-dissipative systems.


title: Infinite Mixtures of Multivariate Gaussian Processes

abstract:
  This paper presents a new model called infinite mixtures of multivariate
Gaussian processes, which can be used to learn vector-valued functions and
applied to multitask learning. As an extension of the single multivariate
Gaussian process, the mixture model has the advantages of modeling multimodal
data and alleviating the computationally cubic complexity of the multivariate
Gaussian process. A Dirichlet process prior is adopted to allow the (possibly
infinite) number of mixture components to be automatically inferred from
training data, and Markov chain Monte Carlo sampling techniques are used for
parameter and latent variable inference. Preliminary experimental results on
multivariate regression show the feasibility of the proposed model.


title: Superconductivity in Ir1-xRhxTe2 (0<=x<=0.3)

abstract:
  We report superconductivity, physical and structural properties of
Ir1-xRhxTe2 (0<=x<=0.3). Superconducting transition with maximum Tc~2.6 K
appears when the doping content of Rh x is in between 0.15 and 0.3. Further
increasing the content of Rh will suppress the superconductivity. On the other
hand, the high-temperature structural transition is suppressed gradually as Rh
is incorporated into the lattice, eventually vanishing at x=0.2. These results
imply competing relationship between structural transition and
superconductivity. The isovalent ionic substitution of Rh into Ir has different
effects on physical properties when compared to the isovalent anionic
substitution of Se into Te, in which the structural transition is enhanced with
Se substitution. It indicates the changes of structural parameters such as
ionic size and electronegativity of elements will also have important effects
on the evolution of physical properties in IrTe2.


title:
The distribution of 2-Selmer ranks of quadratic twists of elliptic
  curves with partial two-torsion

abstract:
  This paper presents a new result concerning the distribution of 2-Selmer
ranks in the quadratic twist family of an elliptic curve over an arbitrary
number field K with a single point of order two that does not have a cyclic
4-isogeny defined over its two-division field. We prove that at least half of
all the quadratic twists of such an elliptic curve have arbitrarily large
2-Selmer rank, showing that the distribution of 2-Selmer ranks in the quadratic
twist family of such an elliptic curve differs from the distribution of
2-Selmer ranks in the quadratic twist family of an elliptic curve having either
no rational two-torsion or full rational two-torsion.


title: Reliability and Comparability of Peer Review Results

abstract:
  In this paper peer review reliability is investigated based on peer ratings
of research teams at two Belgian universities. It is found that outcomes can be
substantially influenced by the different ways in which experts attribute
ratings. To increase reliability of peer ratings, procedures creating a uniform
reference level should be envisaged. One should at least check for signs of low
reliability, which can be obtained from an analysis of the outcomes of the peer
evaluation itself. The peer review results are compared to outcomes from a
citation analysis of publications by the same teams, in subject fields well
covered by citation indexes. It is illustrated how, besides reliability,
comparability of results depends on the nature of the indicators, on the
subject area and on the intrinsic characteristics of the methods. The results
further confirm what is currently considered as good practice: the presentation
of results for not one but for a series of indicators.


title: Order-by-disorder and quantum Coulomb phase in quantum square ice

abstract:
  We reconstruct the equilibrium phase diagram of quantum square ice, realized
by the transverse-field Ising model on the checkerboard lattice, using a
combination of quantum Monte Carlo, degenerate perturbation theory and gauge
mean-field theory. The extensive ground-state degeneracy of classical square
ice is lifted by the transverse field, leading to two distinct
order-by-disorder phases, a plaquette valence-bond solid for low field, and a
canted Neel state for stronger fields. These two states appear via a highly
non-linear effect of quantum fluctuations, and they can be identified with the
phases of a lattice gauge theory (quantum link model) emerging as the effective
Hamiltonian of the system within degenerate perturbation theory up to the 8th
order. The plaquette valence-bond solid melts at a very low temperature, above
which the system displays a thermally induced quantum Coulomb phase, supporting
deconfined spinons.


title:
Research evaluation per discipline: a peer-review method and its
  outcomes

abstract:
  This paper describes the method for ex-post peer review evaluation per
research discipline used at the Vrije Universiteit Brussel (VUB) and summarizes
the outcomes obtained from it. The method produces pertinent advice and
triggers responses - at the level of the individual researcher, the research
team and the university's research management - for the benefit of research
quality, competitivity and visibility. Imposed reflection and contacts during
and after the evaluation procedure modify the individual researcher's attitude,
improve the research teams' strategies and allow for the extraction of general
recommendations that are used as discipline-dependent guidelines in the
university's research management. The deep insights gained in the different
research disciplines and the substantial data sets on their research, support
the university management in its policy decisions and in building policy
instruments. Moreover, the results are used as a basis for comparison with
other assessments, leading to a better understanding of the possibilities and
limitations of different evaluation processes. The peer review method can be
applied systematically in a pluri-annual cycle of research discipline
evaluations to build up a complete overview, or it can be activated on an ad
hoc basis for a particular discipline, based on demands from research teams or
on strategic or policy arguments.


title: How robust is a thermal photon interpretation of the ALICE low-p_T data?

abstract:
  We present a rigorous theoretical analysis of the ALICE measurement of
low-p_T direct-photon production in central lead-lead collisions at the LHC
with a centre-of-mass energy of \sqrt{s_{NN}}=2.76 TeV. Using NLO QCD, we
compute the relative contributions to prompt-photon production from different
initial and final states and the theoretical uncertainties coming from
independent variations of the renormalisation and factorisation scales, the
nuclear parton densities and the fragmentation functions. Based on different
fits to the unsubtracted and prompt-photon subtracted ALICE data, we
consistently find T = 304 \pm 58 MeV and 309 \pm 64 MeV for the effective
temperature of the quark-gluon plasma (or hot medium) at p_T \in [0.8;2.2] GeV
and p_T \in [1.5;3.5] GeV as well as a power-law (p_T^{-4}) behavior for p_T >
4 GeV as predicted by QCD hard scattering.


title:
Impact vitality: an indicator based on citing publications in search of
  excellent scientists

abstract:
  This paper contributes to the quest for an operational definition of
'research excellence' and proposes a translation of the excellence concept into
a bibliometric indicator. Starting from a textual analysis of funding program
calls aimed at individual researchers and from the challenges for an indicator
at this level in particular, a new type of indicator is proposed. The Impact
Vitality indicator [RONS & AMEZ, 2008] reflects the vitality of the impact of a
researcher's publication output, based on the change in volume over time of the
citing publications. The introduced metric is shown to posses attractive
operational characteristics and meets a number of criteria which are desirable
when comparing individual researchers. The validity of one of the possible
indicator variants is tested using a small dataset of applicants for a senior
full time Research Fellowship. Options for further research involve testing
various indicator variants on larger samples linked to different kinds of
evaluations.


title: Many-body Matter-wave Dark Soliton

abstract:
  The Gross-Pitaevskii equation - which describes interacting bosons in the
mean-field approximation - possesses solitonic solutions in dimension one. For
repulsively interacting particles, the stationary soliton is dark, i.e. is
represented by a local density minimum. Many-body effects may lead to filling
of the dark soliton. Using quasi-exact many-body simulations, we show that, in
single realizations, the soliton appears totally dark although the single
particle density tends to be uniform.


title:
Take a break: cloud scheduling optimized for real-time electricity
  pricing

abstract:
  Cloud computing revolutionised the industry with its elastic, on-demand
approach to computational resources, but has lead to a tremendous impact on the
environment. Data centers constitute 1.1-1.5% of total electricity usage in the
world. Taking a more informed view of the electrical grid by analysing
real-time electricity prices, we set the foundations of a grid-conscious cloud.
We propose a scheduling algorithm that predicts electricity price peaks and
throttles energy consumption by pausing virtual machines. We evaluate the
approach on the OpenStack cloud manager through an empirical approach and show
reductions in energy consumption and costs. Finally, we define green instances
in which cloud providers can offer such services to their customers under
better pricing options.


title:
The Solar Neighborhood XXIX: The Habitable Real Estate of our Nearest
  Stellar Neighbors

abstract:
  We use the sample of known stars and brown dwarfs within 5 pc of the Sun,
supplemented with AFGK stars within 10 pc, to determine which stellar spectral
types provide the most habitable real estate --- defined to be locations where
liquid water could be present on Earth-like planets. Stellar temperatures and
radii are determined by fitting model spectra to spatially resolved broad-band
photometric energy distributions for stars in the sample. The locations of the
HZ's are calculated using an empirical formula for planetary surface
temperature and assuming the condition of liquid water, called here the
empirical habitable zone, or EHZ. Systems that have dynamically disruptive
companions, assuming a 5:1 separation ratios for primary/secondary pairs and
either object and a planet, are considered not habitable. We then derive a
simple formula to predict the location of the EHZ for main sequence stars based
on V-K color. We consider EHZ widths as more useful measures of the habitable
real estate around stars than areas because multiple planets are not expected
to orbit stars at identical stellar distances. This EHZ provides a qualitative
guide on where to expect the largest population of planets in the HZ of main
sequence stars. M stars provide more EHZ real estate than other spectral types,
possessing 36.5% of the habitable real estate en masse. K stars are second with
21.5%, while A, F, and G stars offer 18.5%, 6.9% and 16.6%, respectively. Our
calculations show that three M dwarfs within 10 pc harbor planets in their
EHZs. GJ 581 may have two planets (d with msini = 6.1 M_E; g with msini = 3.1
M_E), GJ 667 C has one (c with msini = 4.5 M_E), and GJ 876 has two (b with
msini = 1.89 M_J and c with msini = 0.56 M_J). If Earth-like planets are as
common around low mass stars as recent Kepler results suggest, M stars are the
most likely place to find Earth-like planets in HZ's.


title:
Global Attractivity and Extinction for Lotka-Volterra systems with
  infinite delay and feedback controls

abstract:
  The paper deals with a multiple species Lotka-Volterra model with infinite
distributed delays and feedback controls, for which we assume a weak form of
diagonal dominance of the instantaneous negative intra-specific terms over the
infinite delay effect in both the population variables and controls. General
sufficient conditions for the existence and attractivity of a saturated
equilibrium are established. When the saturated equilibrium is on the boundary
of $\R^n_+$, sharper criteria for the extinction of all or part of the
populations are given. While the literature usually treats the case of
competitive systems only, here no restrictions on the signs of the intra- and
inter-specific delayed terms are imposed. Moreover, our technique does not
require the construction of Lyapunov functionals.


title: Charge-Ordering Transition in (TMTTF)$_2$X Explored via Dilatometry

abstract:
  Charge-ordering phenomena have been highly topical over the last few years. A
phase transition towards a charge ordered state has been observed
experimentally in several classes of materials. Among them, many studies have
been devoted to the family of quasi-one dimensional organic charge-transfer
salts (TMTTF)$_2$X, where (TMTTF) stands for tetramethyltetrathiafulvalene and
X for a monovalent anion (X = PF$_6$, AsF$_6$ and SbF$_6$). However, the
relationship between the electron localization phenomena and the role of the
lattice distortion in stabilizing the charge-ordering pattern is poorly
documented in the literature. Here we present a brief overview of selected
literature results with emphasis placed on recent thermal expansion experiments
probing the charge-ordering transition of these salts.


title:
Study of the Crab Nebula TeV emission variability during five years with
  ARGO-YBJ

abstract:
  The flaring activity of the Crab Nebula is one of the most puzzling phenomena
of the gamma ray sky. The light curves in the energy range E >100 MeV show a
high flux variability on time scales ranging from hours to weeks, with sharp
emission peaks superimposed to long lasting smoother modulations, whose origin
is still under debate. A long term observation of the Crab Nebula at TeV
energies could add useful information to understand the mechanisms responsible
of this unexpected behavior. The air shower detector ARGO-YBJ monitored the
Crab Nebula in the energy range 0.5-20 TeV from November 2007 to February 2013.
During the flaring episodes observed by Fermi, the average ARGO-YBJ flux is
found to be a factor 2.4 \pm 0.8 larger than the average value. Performing a
long term study of the Crab Nebula flux, the ARGO-YBJ light curve is consistent
with a uniform flux with a probability of 0.11. However, a comparison with the
Fermi LAT light curve during 4.5 years shows a correlation between the data of
the two experiments. The percent flux variations observed by ARGO-YBJ with
respect to the average value are consistent with the variations of the Fermi
rate, suggesting, in the hypotesis that the modulations are real, the same
physical process at the origin of the observed flux variations.


title: Python for education: permutations

abstract:
  Python implementation of permutations is presented. Three classes are
introduced: Perm for permutations, Group for permutation groups, and PermError
to report any errors for both classes. The class Perm is based on Python
dictionaries and utilize cycle notation. The methods of calculation for the
perm order, parity, ranking and unranking are given. A random permutation
generation is also shown. The class Group is very simple and it is also based
on dictionaries. It is mainly the presentation of the permutation groups
interface with methods for the group order, subgroups (normalizer, centralizer,
center, stabilizer), orbits, and several tests. The corresponding Python code
is contained in the modules perms and groups.


title:
Quantitative analysis of intra-Golgi transport reveals inter-cisternal
  exchange for all cargo

abstract:
  The mechanisms controlling the transport of proteins across the Golgi stack
of mammalian and plant cells is the subject of intense debate, with two models,
cisternal progression and inter-cisternal exchange, emerging as major
contenders. A variety of transport experiments have claimed support for each of
these models. We reevaluate these experiments using a single quantitative
coarse-grained framework of intra-Golgi transport that accounts for both
transport models and their many variants. Our analysis makes a definitive case
for the existence of inter-cisternal exchange both for small membrane proteins
(VSVG) and large protein complexes (procollagen) -- this implies that membrane
structures larger than the typical protein-coated vesicles must be involved in
transport. Notwithstanding, we find that current observations on protein
transport cannot rule out cisternal progression as contributing significantly
to the transport process. To discriminate between the different models of
intra-Golgi transport, we suggest experiments and an analysis based on our
extended theoretical framework that compare the dynamics of transiting and
resident proteins.


title: Quantum synchronization of a driven self-sustained oscillator

abstract:
  Synchronization is a universal phenomenon that is important both in
fundamental studies and in technical applications. Here we investigate
synchronization in the simplest quantum-mechanical scenario possible, i.e., a
quantum-mechanical self-sustained oscillator coupled to an external harmonic
drive. Using the power spectrum we analyze synchronization in terms of
frequency entrainment and frequency locking in close analogy to the classical
case. We show that there is a step-like crossover to a synchronized state as a
function of the driving strength. In contrast to the classical case, there is a
finite threshold value in driving. Quantum noise reduces the synchronized
region and leads to a deviation from strict frequency locking.


title: Generalized uncertainty principle and black hole thermodynamics

abstract:
  We study the Schwarzschild and Reissner-Nordstr\"{o}m black hole
thermodynamics using the simplest form of the generalized uncertainty principle
(GUP) proposed in the literature. The expressions for the mass-temperature
relation, heat capacity and entropy are obtained in both cases from which the
critical and remnant masses are computed. Our results are exact and reveal that
these masses are identical and larger than the so called singular mass for
which the thermodynamics quantities become ill-defined. The expression for the
entropy reveals the well known area theorem in terms of the horizon area in
both cases upto leading order corrections from GUP. The area theorem written in
terms of a new variable which can be interpreted as the reduced horizon area
arises only when the computation is carried out to the next higher order
correction from GUP.


title:
Distinction of Nuclear Spin States with the Scanning Tunneling
  Microscope

abstract:
  We demonstrate rotational excitation spectroscopy with the scanning tunneling
microscope for physisorbed hydrogen and its isotopes hydrogen-deuterid and
deuterium. The observed excitation energies are very close to the gas phase
values and show the expected scaling with moment of inertia. Since these
energies are characteristic for the molecular nuclear spin states we are able
to identify the para and ortho species of hydrogen and deuterium, respectively.
We thereby demonstrate nuclear spin sensitivity with unprecedented spatial
resolution.


title:
Uniform Anderson localization, unimodal eigenstates and simple spectra
  in a class of "haarsh" deterministic potentials

abstract:
  We study a particular class of families of multi-dimensional lattice
Schr\"o\-dinger operators with deterministic (including quasi-periodic)
potentials generated by the "hull" given by an orthogonal series over the Haar
wavelet basis on the torus, of arbitrary dimension, with expansion coefficients
considered as independent parameters. In the strong disorder regime, we prove
Anderson localization for generic operator families, using a variant of the
Multi-Scale Analysis, and show that all localized eigenfunctions are unimodal
and feature uniform exponential decay away from their respective localization
centers. Using the Klein--Molchanov argument and a variant of the Minami
estimate for deterministic potentials, we prove the simplicity of the spectrum
in our model.
  NOTE: This text completes our earlier manuscript (math-ph/0907.1494),
originally uploaded in 2009 and revised in 2011, which is kept in
\textbf{arXiv} in a reduced form, merely to avoid broken references in earlier
works. Compared to [\texttt{math-ph/0907.1494}], we add the results on
unimodality of the eigenstates, uniform dynamical localization, and simplicity
of p.p. spectra.
  Compared to earlier versions of this preprint, the presentation has been
adapted to the future extension of the main results (uniform localization,
unimodality of the eigenfunctions) to the multi-particle Anderson Hamiltonians
with a nontrivial interaction between the particles, which we plan to publish
in a forthcoming paper.


title: Pivoting makes the ZX-calculus complete for real stabilizers

abstract:
  We show that pivoting property of graph states cannot be derived from the
axioms of the ZX-calculus, and that pivoting does not imply local
complementation of graph states. Therefore the ZX-calculus augmented with
pivoting is strictly weaker than the calculus augmented with the Euler
decomposition of the Hadamard gate. We derive an angle-free version of the
ZX-calculus and show that it is complete for real stabilizer quantum mechanics.


title:
A microkelvin cryogen-free experimental platform with integrated noise
  thermometry

abstract:
  We report experimental demonstration of the feasibility of reaching
temperatures below 1 mK using cryogen-free technology. Our prototype system
comprises an adiabatic nuclear demagnetisation stage, based on
hyperfine-enhanced nuclear magnetic cooling, integrated with a commercial
cryogen-free dilution refrigerator and 8 T superconducting magnet. Thermometry
was provided by a current-sensing noise thermometer. The minimum temperature
achieved at the experimental platform was 600 {\mu}K. The platform remained
below 1 mK for over 24 hours, indicating a total residual heat-leak into the
experimental stage of 5 nW. We discuss straightforward improvements to the
design of the current prototype that are expected to lead to enhanced
performance. This opens the way to widening the accessibility of temperatures
in the microkelvin regime, of potential importance in the application of
strongly correlated electron states in nanodevices to quantum computing.


title:
A Comprehensive Evaluation of Machine Learning Techniques for Cancer
  Class Prediction Based on Microarray Data

abstract:
  Prostate cancer is among the most common cancer in males and its
heterogeneity is well known. Its early detection helps making therapeutic
decision. There is no standard technique or procedure yet which is full-proof
in predicting cancer class. The genomic level changes can be detected in gene
expression data and those changes may serve as standard model for any random
cancer data for class prediction. Various techniques were implied on prostate
cancer data set in order to accurately predict cancer class including machine
learning techniques. Huge number of attributes and few number of sample in
microarray data leads to poor machine learning, therefore the most challenging
part is attribute reduction or non significant gene reduction. In this work we
have compared several machine learning techniques for their accuracy in
predicting the cancer class. Machine learning is effective when number of
attributes (genes) are larger than the number of samples which is rarely
possible with gene expression data. Attribute reduction or gene filtering is
absolutely required in order to make the data more meaningful as most of the
genes do not participate in tumor development and are irrelevant for cancer
prediction. Here we have applied combination of statistical techniques such as
inter-quartile range and t-test, which has been effective in filtering
significant genes and minimizing noise from data. Further we have done a
comprehensive evaluation of ten state-of-the-art machine learning techniques
for their accuracy in class prediction of prostate cancer. Out of these
techniques, Bayes Network out performed with an accuracy of 94.11% followed by
Navie Bayes with an accuracy of 91.17%. To cross validate our results, we
modified our training dataset in six different way and found that average
sensitivity, specificity, precision and accuracy of Bayes Network is highest
among all other techniques used.


title: VERITAS Long-Term Observations of Hard Spectrum Blazars

abstract:
  The VERITAS collaboration has approved long-term observations on several
distant, hard-spectrum blazars. We present first results from VERITAS long-term
observations of 1ES1218+304, 1ES0229+200, and 1ES0414+009. Gamma-ray
observations of distant, hard-spectrum blazars has emerged as an effective,
indirect probe of the universe's diffuse extragalactic background light (EBL),
due to the extinction of gamma-rays via the pair production interaction
$\gamma_{TeV}\gamma_{EBL}\rightarrow e^{+}e^{-}$, which is expected to produce
absorption features in distant gamma-ray sources. The sources presented here
emit spectra that are well fit by power laws.


title:
REECH-ME: Regional Energy Efficient Cluster Heads based on Maximum
  Energy Routing Protocol for WSNs

abstract:
  In this paper, we propose Regional Energy Efficient Cluster Heads based on
Maximum Energy (REECH-ME) Routing Protocol for Wireless Sensor Networks (WSNs)
. The main purpose of this protocol is to improve the network lifetime and
particularly the stability period of the network. In REECH-ME, the node with
the maximum energy in a region becomes Cluster Head (CH) of that region for
that particular round and the number of the cluster heads in each round remains
the same. Our technique outperforms LEACH which uses probabilistic approach for
the selection of CHs. We also implement the Uniform Random Distribution Model
to find the packet drop to make this protocol more practical. We also calculate
the confidence interval of all our results which helps us to visualize the
possible deviation of our graphs from the mean value.


title: Physical characterization of quantum devices from nonlocal correlations

abstract:
  In the device-independent approach to quantum information theory, quantum
systems are regarded as black boxes which, given an input (the measurement
setting), return an output (the measurement result). These boxes are then
treated regardless of their actual internal working. In this paper, we develop
SWAP, a theoretical concept which, in combination with the tool of
semi-definite methods for the characterization of quantum correlations, allows
us to estimate physical properties of the black boxes from the observed
measurement statistics. We find that the SWAP tool provides bounds orders of
magnitude better than previously-known techniques (e.g.: for a CHSH violation
larger than 2.57, SWAP predicts a singlet fidelity greater than 70%). This
method also allows us to deal with hitherto intractable cases such as robust
device-independent self-testing of non-maximally entangled two-qutrit states in
the CGLMP scenario (for which Jordan's Lemma does not apply) and the
device-independent certification of entangled measurements. We further apply
the SWAP method to relate nonlocal correlations to work extraction and quantum
dimensionality, hence demonstrating that this tool can be used to study a wide
variety of properties relying on the sole knowledge of accessible statistics.


title:
On the asymptotic normality of frequency polygons for strongly mixing
  spatial processes

abstract:
  This paper establishes the asymptotic normality of frequency polygons in the
context of stationary strongly mixing random fields indexed by $\Z^d$. Our
method allows us to consider only minimal conditions on the width bins and
provides a simple criterion on the mixing coefficients. In particular, we
improve in several directions a previous result by Carbon, Francq and Tran
(2010).


title:
On the dynamics of interacting populations in presence of state
  dependent fluctuations

abstract:
  We discuss several models of the dynamics of interacting populations. The
models are constructed by nonlinear differential equations and have two sets of
parameters: growth rates and coefficients of interaction between populations.
We assume that the parameters depend on the densities of the populations. In
addition the parameters can be influenced by different factors of the
environment. This influence is modelled by noise terms in the equations for the
growth rates and interaction coefficients. Thus the model differential
equations become stochastic. In some particular cases these equations can be
reduced to a Foker-Plancnk equation for the probability density function of the
densities of the interacting populations.


title: Quantum Supergroups III. Twistors

abstract:
  We establish direct connections at several levels between quantum groups and
supergroups associated to bar-consistent super Cartan datum by constructing an
automorphism (called twistor) in the setting of covering quantum groups. The
canonical bases of the halves of quantum groups and supergroups are shown to
match under the twistor up to powers of a square root of -1. We further show
that the modified quantum group and supergroup are isomorphic over the rational
function field adjoint with a square root of -1, by constructing a twistor on
the modified covering quantum group. An equivalence of categories of weight
modules for quantum groups and supergroups follows.


title:
A Survey of Home Energy Management Systems in Future Smart Grid
  Communications

abstract:
  In this paper we present a systematic review of various home energy
management (HEM) schemes. Employment of home energy management programs will
make the electricity consumption smarter and more efficient. Advantages of HEM
include, increased savings for consumers as well as utilities, reduced peak to
average ratio (PAR) and peak demand. Where there are numerous applications of
smart grid technologies, home energy management is probably the most important
one to be addressed. Utilities across the globe have taken various steps for
efficient consumption of electricity. New pricing schemes like, Real Time
Pricing (RTP), Time of Use (ToU), Inclining Block Rates (IBR), Critical Peak
Pricing (CPP) etc, have been proposed for smart grid. Distributed Energy
Resources (DER) (local generation) and/or home appliances coordination along
with different tariff schemes lead towards efficient consumption of
electricity. This work also discusses a HEM systems general architecture and
various challenges in implementation of this architecture in smart grid.


title: The Economic Trend of Video Game Industry

abstract:
  In recent years the game industry has had a huge growth. We've seen new game
consoles, great looking games and an increase in the number of people playing
them. We are presently in the seventh generation of video games which focuses
on consoles released since 2004. For home consoles,the seventh generation began
on November 22, 2005 with the release of Xbox 360 and continued with the
release of PlayStation 3 on November 11, 2006, and Wii on November 19, 2006.
The current generation is having a console battle between Nintendo's Wii,
Microsoft's Xbox 360, and Sony's PlayStation 3.The appearance of the three new
consoles not only offers various purchase choices, but also greatly affects
economy and culture.


title: MODLEACH: A Variant of LEACH for WSNs

abstract:
  Wireless sensor networks are appearing as an emerging need for mankind.
Though, Such networks are still in research phase however, they have high
potential to be applied in almost every field of life. Lots of research is done
and a lot more is awaiting to be standardized. In this work, cluster based
routing in wireless sensor networks is studied precisely. Further, we modify
one of the most prominent wireless sensor network's routing protocol "LEACH" as
modified LEACH (MODLEACH) by introducing \emph{efficient cluster head
replacement scheme} and \emph{dual transmitting power levels}. Our modified
LEACH, in comparison with LEACH out performs it using metrics of cluster head
formation, through put and network life. Afterwards, hard and soft thresholds
are implemented on modified LEACH (MODLEACH) that boast the performance even
more. Finally a brief performance analysis of LEACH, Modified LEACH (MODLEACH),
MODLEACH with hard threshold (MODLEACHHT) and MODLEACH with soft threshold
(MODLEACHST) is undertaken considering metrics of throughput, network life and
cluster head replacements.


title: Gumbel distribution in exit problems

abstract:
  We explain the connection between the Gumbel limit for diffusion exit times
and the theory of extreme values.


title: An O2If* star found in isolation in the backyard of NGC 3603

abstract:
  In this letter we communicate the identification of a new Galactic O2If* star
(MTT 68) isolated at a projected linear distance of 3 pc from the centre of the
star-burst cluster NGC 3603. From its optical photometry I computed a
bolometric luminosity M_Bol = -10.7, which corresponds to a total stellar
luminosity of 1.5 x 10^{6} L_Sun. It was found an interesting similarity
between MTT 68 and the well known multiple system HD 93129. From Hubble Space
Telescope F656N images of the NGC 3603 field, it was found that MTT 68 is
actually a visual binary system with an angular separation of 0.38 arcsec,
which corresponds to a projected (minimum) linear distance of r_(A-B) = 1.4 x
10^{-2} pc. This value is similar to that for the HD 93129A (O2If*) and HD
93129B (O3.5) pair, r_(A-B) = 3.0 x 10^{-2} pc. On the other hand, HD93129A has
a third closer companion named HD 93129Ab (O3.5) at only 0.053 arcsec, and
taking into account that the X-ray to total stellar luminosity ratio for the
MTT 68 system (L_X/L_Bol 10^{-5}) is about two orders of magnitude above the
canonical value expected for single stars, I suspect that the MTT 68 system
probably hosts another massive companion not resolved by the HST archive
images.


title:
N-Body Simulation of the Formation of the Earth-Moon System from a
  Single Giant Impact

abstract:
  The giant impact hypothesis is the dominant theory of how the Earth-Moon
system was formed. Models have been created that can produce a disk of debris
with the proper mass and composition to create our Moon. Models have also been
created which start with a disk of debris that eventually coalesces into a
Moon. To date, no model has been created that produces a stable Earth-Moon
system in a single simulation. Here we combine two recently published ideas in
this field, along with a new gravity-centered model, and generate such a
simulation. In addition, we show how the method can produce a heterogeneous,
iron-deficient Moon made of mantle material from both colliding bodies, and a
resultant Earth whose equatorial plane is significantly tilted off the ecliptic
plane. The accuracy of the simulation adds credence to the theory that our Moon
was born from the violent union of two heavenly bodies.


title: Hybrid conformal field theories

abstract:
  We describe a class of (2,2) superconformal field theories obtained by
fibering a Landau-Ginzburg orbifold CFT over a compact Kaehler base manifold.
While such models are naturally obtained as phases in a gauged linear sigma
model, our construction is independent of such an embedding. We discuss the
general properties of such theories and present a technique to study the
massless spectrum of the associated heterotic compactification. We test the
validity of our method by applying it to hybrid phases of linear models and
comparing spectra among the phases.


title: Unified Framework for Matter, Dark Matter, and Radiative Neutrino Mass

abstract:
  The well-studied radiative model of neutrino mass through $Z_2$ dark matter
is shown to be naturally realizable in the context of SU(6) grand unification.
A recent new proposal based on U(1)_D dark matter is similarly accommodated in
SU(7). Just as the proton is unstable at the scale of quark-lepton unification,
dark matter is expected to be unstable at a similar scale.


title: Coupling of the A_{1g} As-phonon to magnetism in iron pnictides

abstract:
  Charge, spin and lattice degrees of freedom are strongly entangled in iron
superconductors. A neat consequence of this entanglement is the behavior of the
A_{1g} As-phonon resonance in the different polarization symmetries of Raman
spectroscopy when undergoing the magneto-structural transition. In this work we
show that the observed behavior could be a direct consequence of the coupling
of the phonons with the electronic excitations in the anisotropic magnetic
state. We discuss this scenario within a five orbital tight-binding model
coupled to phonons via the dependence of the Slater-Koster parameters on the As
position. We identify two qualitatively different channels of the
electron-phonon interaction: a geometrical one related to the Fe-As-Fe angle
and another one associated with the modification upon As displacement of the
Fe-As energy integrals pdsigma and pdpi. While both mechanisms result in a
finite B_{1g} response, the behavior of the phonon intensity in the A_{1g} and
B_{1g} Raman polarization geometries is qualitatively different when the
coupling is driven by the angle or by the energy integral dependence. We
discuss our results in view of the experimental reports.


title: Asymptotic Proportion of Hard Instances of the Halting Problem

abstract:
  Although the halting problem is undecidable, imperfect testers that fail on
some instances are possible. Such instances are called hard for the tester. One
variant of imperfect testers replies "I don't know" on hard instances, another
variant fails to halt, and yet another replies incorrectly "yes" or "no". Also
the halting problem has three variants: does a given program halt on the empty
input, does a given program halt when given itself as its input, or does a
given program halt on a given input. The failure rate of a tester for some size
is the proportion of hard instances among all instances of that size. This
publication investigates the behaviour of the failure rate as the size grows
without limit. Earlier results are surveyed and new results are proven. Some of
them use C++ on Linux as the computational model. It turns out that the
behaviour is sensitive to the details of the programming language or
computational model, but in many cases it is possible to prove that the
proportion of hard instances does not vanish.


title: Remarks on Lubbock's summation formulae

abstract:
  The coefficients occurring in summation formulae of the Lubbock type are
shown to be generalised Bernoulli polynomials which turn up in subdivision
questions such as quantum field theory around a conical singularity and on
spherical lunes. An image interpretation is made, generating functions are
brought in and some trigonometric summations encountered. A formal Lubbock
formula is introduced for a general delta operator.


title:
Distance Aware Relaying Energy-efficient: DARE to Monitor Patients in
  Multi-hop Body Area Sensor Networks

abstract:
  In recent years, interests in the applications of Wireless Body Area Sensor
Network (WBASN) is noticeably developed. WBASN is playing a significant role to
get the real time and precise data with reduced level of energy consumption. It
comprises of tiny, lightweight and energy restricted sensors, placed in/on the
human body, to monitor any ambiguity in body organs and measure various
biomedical parameters. In this study, a protocol named Distance Aware Relaying
Energy-efficient (DARE) to monitor patients in multi-hop Body Area Sensor
Networks (BASNs) is proposed. The protocol operates by investigating the ward
of a hospital comprising of eight patients, under different topologies by
positioning the sink at different locations or making it static or mobile.
Seven sensors are attached to each patient, measuring different parameters of
Electrocardiogram (ECG), pulse rate, heart rate, temperature level, glucose
level, toxins level and motion. To reduce the energy consumption, these sensors
communicate with the sink via an on-body relay, affixed on the chest of each
patient. The body relay possesses higher energy resources as compared to the
body sensors as, they perform aggregation and relaying of data to the sink
node. A comparison is also conducted conducted with another protocol of BAN
named, Mobility-supporting Adaptive Threshold-based Thermal-aware
Energy-efficient Multi-hop ProTocol (M-ATTEMPT). The simulation results show
that, the proposed protocol achieves increased network lifetime and efficiently
reduces the energy consumption, in relative to M-ATTEMPT protocol.


title: Manin's conjecture for certain biprojective hypersurfaces

abstract:
  Using the circle method, we count integer points on complete intersections in
biprojective space in boxes of different side length, provided the number of
variables is large enough depending on the degree of the defining equations and
certain loci related to the singular locus. Having established these
asymptotics we deduce asymptotic formulas for rational points on such varieties
with respect to the anticanonical height function. In particular, we establish
a conjecture of Manin for certain smooth hypersurfaces in biprojective space of
sufficiently large dimension.


title:
An identity of hitting times and its application to the valuation of
  guaranteed minimum withdrawal benefit

abstract:
  In this paper we explore an identity in distribution of hitting times of a
finite variation process (Yor's process) and a diffusion process (geometric
Brownian motion with affine drift), which arise from various applications in
financial mathematics. As a result, we provide analytical solutions to the fair
charge of variable annuity guaranteed minimum withdrawal benefit (GMWB) from a
policyholder's point of view, which was only previously obtained in the
literature by numerical methods. We also use complex inversion methods to
derive analytical solutions to the fair charge of the GMWB from an insurer's
point of view, which is used in the market practice, however, based on Monte
Carlo simulations. Despite of their seemingly different formulations, we can
prove under certain assumptions the two pricing approaches are equivalent.


title: The JEM-EUSO Mission: Contributions to the ICRC 2013

abstract:
  Contributions of the JEM-EUSO Collaboration to the 33rd International Cosmic
Ray Conference (The Astroparticle Physics Conference) Rio de Janeiro, July,
2013.


title:
Molecular Dynamics Simulations of Single-Layer Molybdenum Disulphide
  (MoS2): Stillinger-Weber Parametrization, Mechanical Properties, and Thermal
  Conductivity

abstract:
  We present a parameterization of the Stillinger-Weber potential to describe
the interatomic interactions within single-layer MoS2 (SLMoS2). The potential
parameters are fitted to an experimentally-obtained phonon spectrum, and the
resulting empirical potential provides a good description for the energy gap
and the crossover in the phonon spectrum. Using this potential, we perform
classical molecular dynamics simulations to study chirality, size, and strain
effects on the Young's modulus and the thermal conductivity of SLMoS2. We
demonstrate the importance of the free edges on the mechanical and thermal
properties of SLMoS2 nanoribbons. Specifically, while edge effects are found to
reduce the Young's modulus of SLMoS2 nanoribbons, the free edges also reduce
the thermal stability of SLMoS2 nanoribbons, which may induce melting well
below the bulk melt temperature. Finally, uniaxial strain is found to
efficiently manipulate the thermal conductivity of infinite, periodic SLMoS2.


title:
Non-Abelian off-diagonal geometric phases in nano-engineered four-qubit
  systems

abstract:
  The concept of off-diagonal geometric phase (GP) has been introduced in order
to recover interference information about the geometry of quantal evolution
where the standard GPs are not well-defined. In this Letter, we propose a
physical setting for realizing non-Abelian off-diagonal GPs. The proposed
non-Abelian off-diagonal GPs can be implemented in a cyclic chain of four
qubits with controllable nearest-neighbor interactions. Our proposal seems to
be within reach in various nano-engineered systems and therefore opens up for
first experimental test of the non-Abelian off-diagonal GP.


title: The XMM-Newton EPIC X-ray Light Curve Analysis of WR 6

abstract:
  We obtained four pointings of over 100 ks each of the well-studied Wolf-Rayet
star WR 6 with the XMM-Newton satellite. With a first paper emphasizing the
results of spectral analysis, this follow-up highlights the X-ray variability
clearly detected in all four pointings. However, phased light curves fail to
confirm obvious cyclic behavior on the well-established 3.766 d period widely
found at longer wavelengths. The data are of such quality that we were able to
conduct a search for "event clustering" in the arrival times of X-ray photons.
However, we fail to detect any such clustering. One possibility is that X-rays
are generated in a stationary shock structure. In this context we favor a
co-rotating interaction region (CIR) and present a phenomenological model for
X-rays from a CIR structure. We show that a CIR has the potential to account
simultaneously for the X-ray variability and constraints provided by the
spectral analysis. Ultimately, the viability of the CIR model will require both
intermittent long-term X-ray monitoring of WR 6 and better physical models of
CIR X-ray production at large radii in stellar winds.


title:
DREEM-ME: Distributed Regional Energy Efficient Multi-hop Routing
  Protocol based on Maximum Energy in WSNs

abstract:
  Wireless distributed sensor network consists of randomly deployed sensors
having low energy assets. These networks can be used for monitoring a variety
of environments. Major problems of these networks are energy constraints and
their finite lifetimes. To overcome these problems different routing protocols
and clustering techniques are introduced. We propose DREEM-ME which uses a
unique technique for clustering to overcome these two problems efficiently.
DREEM-ME elects a fix number of cluster heads (CHs) in each round instead of
probabilistic selection of CHs. Packet Drop Technique is also implemented in
our protocol to make it more comprehensive and practical. In DREEM-ME
confidence interval is also shown in each graph which helps in visualising the
maximum deviation from original course. Our simulations and results show that
DREEM-ME is much better than existing protocols of the same nature.


title: Classical dynamics on curved Snyder space

abstract:
  We study the classical dynamics of a particle in nonrelativistic Snyder-de
Sitter space. We show that for spherically symmetric systems, parametrizing the
solutions in terms of an auxiliary time variable, which is a function only of
the physical time and of the energy and angular momentum of the particles, one
can reduce the problem to the equivalent one in classical mechanics. We also
discuss a relativistic extension of these results, and a generalization to the
case in which the algebra is realized in flat space.


title:
An inflationary model with small scalar and large tensor
  nongaussianities

abstract:
  We study a model of inflation where the scalar perturbations are almost
gaussian while there is sizable (equilateral) nongaussianity in the tensor
sector. In this model, a rolling pseudoscalar gravitationally coupled to the
inflaton amplifies the vacuum fluctuations of a vector field. The vector
sources both scalar and tensor metric perturbations. Both kinds of
perturbations are nongaussian, but, due to helicity conservation, the tensors
have a larger amplitude, so that nongaussianity in the scalar perturbations is
negligible. Moreover, the tensors produced this way are chiral. We study, in
the flat sky approximation, how constraints on tensor nongaussianities affect
the detectability of parity violation in the Cosmic Microwave Background. We
expect the model to feature interesting patterns on nongaussianities in the
polarization spectra of the CMB.


title: Three evolutionary paths for magnetar oscillations

abstract:
  Quasi-periodic oscillations have been seen in the light curves following
several magnetar giant flares. These oscillations are of great interest as they
probably provide our first ever view of the normal modes of oscillation of
neutron stars. The state-of-the-art lies in the study of the oscillations of
elastic-magnetic stellar models, mainly with a view to relating the observed
frequencies to the structure and composition of the star itself. We advance
this programme by considering several new physical mechanisms that are likely
to be important for magnetar oscillations. These relate to the
superfluid/superconducting nature of the stellar interior, and the damping of
the modes, both through internal dissipation mechanisms and the launching of
waves into the magnetosphere. We make simple order-of-magnitude estimates to
show that both the frequencies and the damping time of magnetar oscillations
can evolve in time, identifying three distinct `pathways' that can be followed,
depending upon the initial magnitude of the mode excitation. These results are
interesting as they show that the information buried in magnetar QPOs may be
even richer than previously thought, and motivate more careful examination of
magnetar light curves, to search for signatures of the different types of
evolution that we have identified.


title:
Mean value formulas for solutions of some degenerate elliptic equations
  and applications

abstract:
  We prove a mean value formula for weak solutions of $div(|y|^{a}\grad u)=0$
in $\mathbb{R}^{n+1}=\{(x,y): x\in\mathbb{R}^{n}, y\in\mathbb{R}\}$, $-1<a<1$
and balls centered at points of the form $(x,0)$. We obtain an explicit
nonlocal kernel for the mean value formula for solutions of
$(-\triangle)^{s}f=0$ on a domain $D$ of $\mathbb{R}^{n}$. When $D$ is
Lipschitz we prove a Besov type regularity improvement for the solutions of
$(-\triangle)^{s}f=0$.


title: Born Reciprocity in String Theory and the Nature of Spacetime

abstract:
  After many years, the deep nature of spacetime in string theory remains an
enigma. In this letter we incorporate the concept of Born reciprocity in order
to provide a new point of view on string theory in which spacetime is a derived
dynamical concept. This viewpoint may be thought of as a dynamical chiral phase
space formulation of string theory, in which Born reciprocity is implemented as
a choice of a Lagrangian submanifold of the phase space, and amounts to a
generalization of T-duality. In this approach the fundamental symmetry of
string theory contains phase space diffeomorphism invariance and the underlying
string geometry should be understood in terms of dynamical bi-Lagrangian
manifolds and an apparently new geometric structure, somewhat reminiscent of
para-quaternionic geometry, which we call Born geometry.


title: 3-extremal holomorphic maps and the symmetrised bidisc

abstract:
  We analyse the 3-extremal holomorphic maps from the unit disc $\mathbb{D}$ to
the symmetrised bidisc $ \mathcal{G}$, defined to be the set $ \{(z+w,zw):
z,w\in\mathbb{D}\}$, with a view to the complex geometry and function theory of
$\mathcal{G}$. These are the maps whose restriction to any triple of distinct
points in $\mathbb{D}$ yields interpolation data that are only just solvable.
We find a large class of such maps; they are rational of degree at most 4. It
is shown that there are two qualitatively different classes of rational
$\mathcal{G}$-inner functions of degree at most 4, to be called {\em aligned}
and {\em caddywhompus} functions; the distinction relates to the cyclic
ordering of certain associated points on the unit circle. The aligned ones are
3-extremal.
  We describe a method for the construction of aligned rational
$\mathcal{G}$-inner functions; with the aid of this method we reduce the
solution of a 3-point interpolation problem for aligned holomorphic maps from
$\mathbb{D}$ to $\mathcal{G}$ to a collection of classical Nevanlinna-Pick
problems with mixed interior and boundary interpolation nodes. Proofs depend on
a form of duality for $\mathcal{G}$.


title:
Relativistic Quantum Metrology: Exploiting relativity to improve quantum
  measurement technologies

abstract:
  We present a framework for relativistic quantum metrology that is useful for
both Earth-based and space-based technologies. Quantum metrology has been so
far successfully applied to design precision instruments such as clocks and
sensors which outperform classical devices by exploiting quantum properties.
There are advanced plans to implement these and other quantum technologies in
space, for instance Space-QUEST and Space Optical Clock projects intend to
implement quantum communications and quantum clocks at regimes where relativity
starts to kick in. However, typical setups do not take into account the effects
of relativity on quantum properties. To include and exploit these effects, we
introduce techniques for the application of metrology to quantum field theory.
Quantum field theory properly incorporates quantum theory and relativity, in
particular, at regimes where space-based experiments take place. This framework
allows for high precision estimation of parameters that appear in quantum field
theory including proper times and accelerations. Indeed, the techniques can be
applied to develop a novel generation of relativistic quantum technologies for
gravimeters, clocks and sensors. As an example, we present a high precision
device which in principle improves the state-of-the-art in quantum
accelerometers by exploiting relativistic effects.


title: Gamma-ray binaries and related systems

abstract:
  After initial claims and a long hiatus, it is now established that several
binary stars emit high (0.1-100 GeV) and very high energy (>100 GeV) gamma
rays. A new class has emerged called 'gamma-ray binaries', since most of their
radiated power is emitted beyond 1 MeV. Accreting X-ray binaries, novae and a
colliding wind binary (eta Car) have also been detected - 'related systems'
that confirm the ubiquity of particle acceleration in astrophysical sources. Do
these systems have anything in common ? What drives their high-energy emission
? How do the processes involved compare to those in other sources of gamma
rays: pulsars, active galactic nuclei, supernova remnants ? I review the wealth
of observational and theoretical work that have followed these detections, with
an emphasis on gamma-ray binaries. I present the current evidence that
gamma-ray binaries are driven by rotation-powered pulsars. Binaries are
laboratories giving access to different vantage points or physical conditions
on a regular timescale as the components revolve on their orbit. I explain the
basic ingredients that models of gamma-ray binaries use, the challenges that
they currently face, and how they can bring insights into the physics of
pulsars. I discuss how gamma-ray emission from microquasars provides a window
into the connection between accretion--ejection and acceleration, while eta Car
and novae raise new questions on the physics of these objects - or on the
theory of diffusive shock acceleration. Indeed, explaining the gamma-ray
emission from binaries strains our theories of high-energy astrophysical
processes, by testing them on scales and in environments that were generally
not foreseen, and this is how these detections are most valuable.


title:
In silico Modeling of Itk Activation Kinetics in Thymocytes Suggests
  Competing Positive and Negative IP4 Mediated Feedbacks Increase Robustness

abstract:
  The inositol-phosphate messenger inositol(1,3,4,5)tetrakisphosphate (IP4) is
essential for thymocyte positive selection by regulating plasma-membrane
association of the protein tyrosine kinase Itk downstream of the T cell
receptor (TCR). IP4 can act as a soluble analog of the phosphoinositide
3-kinase (PI3K) membrane lipid product phosphatidylinositol(3,4,5)trisphosphate
(PIP3). PIP3 recruits signaling proteins such as Itk to cellular membranes by
binding to PH and other domains. In thymocytes, low-dose IP4 binding to the Itk
PH domain surprisingly promoted and high-dose IP4 inhibited PIP3 binding of Itk
PH domains. However, the mechanisms that underlie the regulation of membrane
recruitment of Itk by IP4 and PIP3 remain unclear. The distinct Itk PH domain
ability to oligomerize is consistent with a cooperative-allosteric mode of IP4
action. However, other possibilities cannot be ruled out due to difficulties in
quantitatively measuring the interactions between Itk, IP4 and PIP3, and in
generating non-oligomerizing Itk PH domain mutants. This has hindered a full
mechanistic understanding of how IP4 controls Itk function. By combining
experimentally measured kinetics of PLC{\gamma}1 phosphorylation by Itk with in
silico modeling of multiple Itk signaling circuits and a maximum entropy
(MaxEnt) based computational approach, we show that those in silico models
which are most robust against variations of protein and lipid expression levels
and kinetic rates at the single cell level share a cooperative-allosteric mode
of Itk regulation by IP4 involving oligomeric Itk PH domains at the plasma
membrane. This identifies MaxEnt as an excellent tool for quantifying
robustness for complex TCR signaling circuits and provides testable predictions
to further elucidate a controversial mechanism of PIP3 signaling.


title: Confluence of meromorphic solutions of q-difference equations

abstract:
  In this paper, we consider a q-analogue of the Borel-Laplace summation where
q>1 is a real parameter. In particular, we show that the Borel-Laplace
summation of a divergent power series solution of a linear differential
equation can be uniformly approximated on a convenient sector, by a meromorphic
solution of a corresponding family of linear q-difference equations. We perform
the computations for the basic hypergeometric series. Following J. Sauloy, we
prove how a fundamental set of solutions of a linear differential equation can
be uniformly approximated on a convenient domain by a fundamental set of
solutions of a corresponding family of linear q-difference equations. This
leads us to the approximations of Stokes matrices and monodromy matrices of the
linear differential equation by matrices with entries that are invariants by
the multiplication by q.


title: Inhomogeneous holographic thermalization

abstract:
  The sudden injection of energy in a strongly coupled conformal field theory
and its subsequent thermalization can be holographically modeled by a shell
falling into anti-de Sitter space and forming a black brane. For a homogeneous
shell, Bhattacharyya and Minwalla were able to study this process analytically
using a weak field approximation. Motivated by event-by-event fluctuations in
heavy ion collisions, we include inhomogeneities in this model, obtaining
analytic results in a long wavelength expansion. In the early-time window in
which our approximations can be trusted, the resulting evolution matches well
with that of a simple free streaming model. Near the end of this time window,
we find that the stress tensor approaches that of second-order viscous
hydrodynamics. We comment on possible lessons for heavy ion phenomenology.


title: Correcting Grain-Errors in Magnetic Media

abstract:
  This paper studies new bounds and constructions that are applicable to the
combinatorial granular channel model previously introduced by Sharov and Roth.
We derive new bounds on the maximum cardinality of a grain-error-correcting
code and propose constructions of codes that correct grain-errors. We
demonstrate that a permutation of the classical group codes (e.g.,
Constantin-Rao codes) can correct a single grain-error. In many cases of
interest, our results improve upon the currently best known bounds and
constructions. Some of the approaches adopted in the context of grain-errors
may have application to other channel models.


title:
The Hyperplane is the Only Stable, Smooth Solution to the Isoperimetric
  Problem in Gaussian Space

abstract:
  We study stable smooth solutions to the isoperimetric type problem for a
Gaussian weight on Euclidean Space. That is, we study hypersurfaces $\Sigma^n
\subset \mathbb R^{n+1}$ that are second order stable critical points of
compact variations that minimize Gaussian weighted area and preserve Gaussian
weighted volume. We show that such $\Sigma$ satisfy a curvature condition, and
derive the Jacobi operator $L$ for the second variation of such $\Sigma$.
  Our first main result is that for non-planar $\Sigma$, bounds on the index of
$L$, acting on volume preserving variations, gives us that $\Sigma$ splits off
a linear space. A corollary of this result is that hyperplanes are the only
stable smooth complete solutions to this Gaussian isoperimetric type problem,
and that there are no hypersurfaces of index one. Finally, we show that for the
case of $\Sigma^2 \subset \mathbb R^3$, there is a gradient decay estimate
depending on bounds for the curvature condition and an appropriate area growth
bound. This shows that, in the limit as $R \to \infty$, stable $(\Sigma,
\partial\Sigma) \subset (B_{2R}(0), \partial B_{2R}(0))$ with good area growth
bounds approach hyperplanes.


title: An approximation algorithm for the Bandpass-2 problem

abstract:
  The general Bandpass-$B$ problem is NP-hard and can be approximated by a
reduction into the weighted $B$-set packing problem, with a worst case
performance ratio of $O(B^2)$. When $B = 2$, a maximum weight matching gives a
2-approximation to the problem. In this paper, we call the Bandpass-2 problem
simply the Bandpass problem. The Bandpass problem can be viewed as a variation
of the maximum traveling salesman problem, in which the edge weights are
dynamic rather than given at the front. We present a ${426}{227}$-approximation
algorithm for the problem. Such an improved approximation is built on an
intrinsic structural property proven for the optimal solution and several novel
schemes to partition a $b$-matching into desired matchings.


title:
Strong Ill-posedness of the incompressible Euler equation in borderline
  Sobolev spaces

abstract:
  For the $d$-dimensional incompressible Euler equation, the standard energy
method gives local wellposedness for initial velocity in Sobolev space
$H^s(\mathbb R^d)$, $s>s_c:=d/2+1$. The borderline case $s=s_c$ was a folklore
open problem. In this paper we consider the physical dimensions $d=2,3$ and
show that if we perturb any given smooth initial data in $H^{s_c}$ norm, then
the corresponding solution can have infinite $H^{s_c}$ norm instantaneously at
$t>0$. The constructed solutions are unique and even $C^{\infty}$-smooth in
some cases. To prove these results we introduce a new strategy: large
Lagrangian deformation induces critical norm inflation. As an application we
also settle several closely related open problems.


title: Improved Berezin-Li-Yau inequalities with magnetic field

abstract:
  In this paper we study the eigenvalue sums of Dirichlet Laplacians on bounded
domains. Among our results we establish an improvement of the Li-Yau bound in
the presence of a constant magnetic field.


title:
Relation between two twisted inverse image pseudofunctors in duality
  theory

abstract:
  Grothendieck duality theory assigns to essentially-finite-type maps f of
noetherian schemes a pseudofunctor f^\times right-adjoint to Rf_*, and a
pseudofunctor f^! agreeing with f^\times when f is proper, but equal to the
usual inverse image f^* when f is etale. We define and study a canonical map
from the first pseudofunctor to the second. This map behaves well with respect
to flat base change, and is taken to an isomorphism by "compactly supported"
versions of standard derived functors. Concrete realizations are described, for
instance for maps of affine schemes. Applications include proofs of reduction
theorems for Hochschild homology and cohomology, and of a remarkable formula
for the fundamental class of a flat map of affine schemes.


title:
Pseudodiffusive conductance, quantum-limited shot noise, and
  Landau-level hierarchy in biased graphene bilayer

abstract:
  We discuss, by means of mode-matching analysis for the Dirac equation, how
splittings of the Landau-level (LL) degeneracies associated with spin, valley,
and layer degrees of freedom affect the ballistic conductance of graphene
bilayer. The results show that for wide samples ($W\gg{}L$) the
Landauer-B\"{u}ttiker conductance reaches the maximum
$G\simeq{}se^2/(\pi{h})\times{}W/L$ at the resonance via each LL, with the
prefactor varying from $s=8$ if all three degeneracies are preserved, to $s=1$
if all the degeneracies are split. In the absence of bias between the layers,
the degeneracies associated with spin and layer degrees of freedom may be split
by manipulating the doping and magnetic field; the conductance at the zeroth LL
is twice as large, while the conductance at any other LL equals to the
corresponding conductance of graphene monolayer. The presence of bias potential
allows one also to split the valley degeneracy. Our results show that the
charge transfer at each LL has pseudodiffusive character, with the second and
third cumulant quantified by ${\cal F}=1/3$ and ${\cal R}=1/15$ (respectively).
In case the electrochemical potential is allowed to slowly fluctuate in a
finite vicinity of LL, the resulting charge-transfer characteristics are still
quantum-limited, with ${\cal F}\simeq{}0.7$ and ${\cal R}\simeq{}0.5$ in the
limit of large fluctuations. The above values of ${\cal F}$ and ${\cal R}$ are
also predicted to be approached in the limit of high source-drain voltage
difference applied. The possible effects of indirect interlayer hopping
integrals are also briefly discussed.


title:
Modeling interacting dynamic networks: I. Preferred degree networks and
  their characteristics

abstract:
  We study a simple model of dynamic networks, characterized by a set preferred
degree, $\kappa$. Each node with degree $k$ attempts to maintain its $\kappa$
and will add (cut) a link with probability $w(k;\kappa)$ ($1-w(k;\kappa)$). As
a starting point, we consider a homogeneous population, where each node has the
same $\kappa$, and examine several forms of $w(k;\kappa)$, inspired by
Fermi-Dirac functions. Using Monte Carlo simulations, we find the degree
distribution in steady state. In contrast to the well-known Erd\H{o}s-R\'{e}nyi
network, our degree distribution is not a Poisson distribution; yet its
behavior can be understood by an approximate theory. Next, we introduce a
second preferred degree network and couple it to the first by establishing a
controllable fraction of inter-group links. For this model, we find both
understandable and puzzling features. Generalizing the prediction for the
homogeneous population, we are able to explain the total degree distributions
well, but not the intra- or inter-group degree distributions. When monitoring
the total number of inter-group links, $X$, we find very surprising behavior.
$X$ explores almost the full range between its maximum and minimum allowed
values, resulting in a flat steady-state distribution, reminiscent of a simple
random walk confined between two walls. Both simulation results and analytic
approaches will be discussed.


title: What Planck does not tell us about inflation

abstract:
  Planck data has not found the 'smoking gun' of non-Gaussianity that would
have necessitated consideration of inflationary models beyond the simplest
canonical single field scenarios. This raises the important question of what
these results do imply for more general models, and in particular, multi-field
inflation. In this paper we revisit four ways in which two-field scenarios can
behave differently from single field models; two-field slow-roll dynamics,
curvaton-type behaviour, inflation ending on an inhomogeneous hypersurface and
modulated reheating. We study the constraints that Planck data puts on these
classes of behaviour, focusing on the latter two which have been least studied
in the recent literature. We show that these latter classes are almost
equivalent, and extend their previous analyses by accounting for arbitrary
evolution of the isocurvature mode which, in particular, places important
limits on the Gaussian curvature of the reheating hypersurface. In general,
however, we find that Planck bispectrum results only constrain certain regions
of parameter space, leading us to conclude that inflation sourced by more than
one scalar field remains an important possibility.


title:
Toward Recovering Complete SRS for Softbody Simulation System and a
  Sample Application -- a Team 9a SOEN6481 W13 Project Report

abstract:
  This document aims at specifying the requirements and capturing the needs of
users for building a softbody simulation system. This system has different
applications ranging from computer games to surgery training which facilitates
the creation and visualization of a certain softbody object. It also allows
users to interact with created object at real time. A softbody or deformable
object is an object whose shape changes due to an external force. Deformation
type varies depending on the amount of object deformation. Each object can have
multiple layers and each layer can have its own properties. So layers can be
different in pressure, density and motion.


title: The OscSNS White Paper

abstract:
  There exists a need to address and resolve the growing evidence for
short-baseline neutrino oscillations and the possible existence of sterile
neutrinos. Such non-standard particles require a mass of $\sim 1$ eV/c$^2$, far
above the mass scale associated with active neutrinos, and were first invoked
to explain the LSND $\bar \nu_\mu \rightarrow \bar \nu_e$ appearance signal.
More recently, the MiniBooNE experiment has reported a $2.8 \sigma$ excess of
events in antineutrino mode consistent with neutrino oscillations and with the
LSND antineutrino appearance signal. MiniBooNE also observed a $3.4 \sigma$
excess of events in their neutrino mode data. Lower than expected
neutrino-induced event rates using calibrated radioactive sources and nuclear
reactors can also be explained by the existence of sterile neutrinos. Fits to
the world's neutrino and antineutrino data are consistent with sterile
neutrinos at this $\sim 1$ eV/c$^2$ mass scale, although there is some tension
between measurements from disappearance and appearance experiments. In addition
to resolving this potential major extension of the Standard Model, the
existence of sterile neutrinos will impact design and planning for all future
neutrino experiments. It should be an extremely high priority to conclusively
establish if such unexpected light sterile neutrinos exist. The Spallation
Neutron Source (SNS) at Oak Ridge National Laboratory, built to usher in a new
era in neutron research, provides a unique opportunity for US science to
perform a definitive world-class search for sterile neutrinos.


title: $\mathfrak{S}$-coalgebras determine fundamental groups

abstract:
  In this paper, we extend earlier work by showing that if $X$ and $Y$ are
simplicial complexes (i.e. simplicial sets whose nondegenerate simplices are
determined by their vertices), an isomorphism
$\mathcal{C}(X)\cong\mathcal{C}(Y)$ of coalgebras over the Barratt-Eccles
operad implies that the 3-skeleton of $X$ is weakly equivalent to the
3-skeleton of $Y$, also implying that $\pi_{1}(X)=\pi_{1}(Y)$.


title: Probes of the small x gluon via exclusive J/psi and Upsilon

abstract:
  New, more precise data on diffractive J/psi photoproduction and on exclusive
J/psi production in the process pp -> p + J/psi + p at the LHC allow a better
constraint on the low-x gluon distribution in the domain of relatively low
scales Q^2 ~ 2-6 GeV^2. We account for the `skewed' effect and for the real
part of the amplitude, as well as for the absorptive corrections in the case of
the exclusive process pp -> p + J/psi + p. The predictions for exclusive J/psi
production at \sqrt{s}=8 and 14 TeV and for exclusive Upsilon(1S) production at
7, 8 and 14 TeV are also given. We present results at leading and
next-to-leading order.


title:
Predicition for the decay width of a charged state near the
  $D_s\bar{D}^*/D^*_s\bar{D}$ threshold

abstract:
  Very recently it was predicted the existence of a charged state near the
$D_s\bar{D}^*/D^*_s\bar{D}$ threshold. This state, that we call $Z_{cs}^+$,
would be the strange partner of the recently observed $Z_c^\pm(3900)$. Using
standard techniques of QCD sum rules, we evaluate the three-point function for
the vertices $Z_{cs}^+ \, J/\psi \, K^+$, $Z_{cs}^+ \, \eta_c \, K^{*+}$ and
$Z_{cs}^+ \, D_s^+\bar{D}^{*0}$ and we make predictions for the corresponding
decay widths in these channels.


title:
Synchronous versus asynchronous transport of a paramagnetic particle in
  a modulated ratchet potential

abstract:
  We present a combined experimental and theoretical study describing the
dynamical regimes displayed by a paramagnetic colloidal particle externally
driven above a stripe-patterned magnetic garnet film. A circularly polarized
rotating magnetic field modulates the stray field of the garnet film and
generates a translating periodic potential which induces particle motion.
Increasing the driving frequency, we observe a transition from a phase-locked
motion with constant speed to a sliding dynamics characterized by a lower speed
due to the loss of synchronization with the traveling potential. We explain the
experimental findings with an analytically tractable theoretical model and
interpret the particle dynamics in the presence of thermal noise. The model is
in good quantitative agreement with the experiments.


title:
SIMPLE: Stable Increased-throughput Multi-hop Protocol for Link
  Efficiency in Wireless Body Area Networks

abstract:
  In this work, we propose a reliable, power efficient and high throughput
routing protocol for Wireless Body Area Networks (WBANs). We use multi-hop
topology to achieve minimum energy consumption and longer network lifetime. We
propose a cost function to select parent node or forwarder. Proposed cost
function selects a parent node which has high residual energy and minimum
distance to sink. Residual energy parameter balances the energy consumption
among the sensor nodes while distance parameter ensures successful packet
delivery to sink. Simulation results show that our proposed protocol maximize
the network stability period and nodes stay alive for longer period. Longer
stability period contributes high packet delivery to sink which is major
interest for continuous patient monitoring.


title:
Element Abundances at High-redshift: Magellan MIKE Observations of
  sub-Damped Lyman-alpha Absorbers at 1.7 < z <2.4

abstract:
  We present chemical abundance measurements from high-resolution observations
of 5 sub-damped Lyman-alpha absorbers at 1.7 < z < 2.4 observed with the
Magellan Inamori Kyocera Echelle (MIKE) spectrograph on the 6.5-m Magellan II
Clay telescope. Lines of Zn II, Mg I, Mg II, Al II, Al III, S II, Si II, Si IV,
C II, C II*, C IV, Ni II, Mn II and Fe II were detected and column densities
were determined. The metallicity of the absorbing gas, inferred from the nearly
undepleted element Zn, is in the range of < -0.95 to +0.25 dex for the five
absorbers in our sample, with three of the systems being near-solar or
super-solar. We also investigate the effect of ionisation on the observed
abundances using photoionisation modelling. Combining our data with other
sub-DLA and DLA data from the literature, we report the most complete existing
determination of the metallicity vs. redshift relation for sub-DLAs and DLAs.
We confirm the suggestion from previous investigations that sub-DLAs are, on
average, more metal-rich than DLAs and evolve faster. We also discuss relative
abundances and abundance ratios in these absorbers. The more metal-rich systems
show significant dust depletion levels, as suggested by the ratios [Zn/Cr] and
[Zn/Fe]. For the majority of the systems in our sample, the [Mn/Fe] vs. [Zn/H]
trend is consistent with that seen previously for lower-redshift sub-DLAs. We
also measure the velocity width values for the sub-DLAs in our sample from
unsaturated absorption lines of Fe II 2344, 2374, 2600 A, and examine where
these systems lie in a plot of metallicity vs. velocity dispersion. Finally, we
examine cooling rate vs. H I column density in these sub-DLAs, and compare this
with the data from DLAs and the Milky Way ISM. We find that most of the systems
in our sample show higher cooling rate values compared to those seen in the
DLAs.


title: Linear Quivers and N=1 SCFTs from M5-branes

abstract:
  We study a class of N=1 quiver gauge theories build out of vector multiplets
and matter multiplets in the fundamental and bifundamental representations. We
argue that these theories flow to interacting SCFTs in the IR and calculate
their central charges. We exhibit a type IIA brane construction which at low
energies is described by these SCFTs. This also leads to a natural description
of the theories in terms of M5-branes on a punctured sphere.


title: M-GEAR: Gateway-Based Energy-Aware Multi-Hop Routing Protocol for WSNs

abstract:
  In this research work, we advise gateway based energy-efficient routing
protocol (M-GEAR) for Wireless Sensor Networks (WSNs). We divide the sensor
nodes into four logical regions on the basis of their location in the sensing
field. We install Base Station (BS) out of the sensing area and a gateway node
at the centre of the sensing area. If the distance of a sensor node from BS or
gateway is less than predefined distance threshold, the node uses direct
communication. We divide the rest of nodes into two equal regions whose
distance is beyond the threshold distance. We select cluster heads (CHs)in each
region which are independent of the other region. These CHs are selected on the
basis of a probability. We compare performance of our protocol with LEACH (Low
Energy Adaptive Clustering Hierarchy). Performance analysis and compared
statistic results show that our proposed protocol perform well in terms of
energy consumption and network lifetime.


title: On the Dolbeault--Dirac Operator of Quantized Symmetric Spaces

abstract:
  The Dolbeault complex of a quantized compact Hermitian symmetric space is
expressed in terms of the Koszul complex of a braided symmetric algebra of
Berenstein and Zwicknagl. This defines a spectral triple quantizing the
Dolbeault-Dirac operator associated to the canonical spin^c structure.


title:
THE-FAME: THreshold based Energy-efficient FAtigue MEasurment for
  Wireless Body Area Sensor Networks using Multiple Sinks

abstract:
  Wireless Body Area Sensor Network (WBASN) is a technology employed mainly for
patient health monitoring. New research is being done to take the technology to
the next level i.e. player's fatigue monitoring in sports. Muscle fatigue is
the main cause of player's performance degradation. This type of fatigue can be
measured by sensing the accumulation of lactic acid in muscles. Excess of
lactic acid makes muscles feel lethargic. Keeping this in mind we propose a
protocol \underline{TH}reshold based \underline{E}nergy-efficient
\underline{FA}tigue \underline{ME}asurement (THE-FAME) for soccer players using
WBASN. In THE-FAME protocol, a composite parameter has been used that consists
of a threshold parameter for lactic acid accumulation and a parameter for
measuring distance covered by a particular player. When any parameters's value
in this composite parameter shows an increase beyond threshold, the players is
declared to be in a fatigue state. The size of battery and sensor should be
very small for the sake of players' best performance. These sensor nodes,
implanted inside player's body, are made energy efficient by using multiple
sinks instead of a single sink. Matlab simulation results show the
effectiveness of THE-FAME.


title: Classical limit of the canonical partition function

abstract:
  We analyze the so-called classical limit of the quantum-mechanical canonical
partition function. In order to do that, we define accurately the density
matrix for symmetrized and antisymmetrized wave functions only (Bose-Einstein
and Fermi-Dirac), and find an exact relation between them and the density
matrix for non symmetrized functions (Maxwell-Boltzmann). Our results differ
from the generally assumed in a numerical factor N!, for which we suggest a
physical interpretation. We derive as well the reverse (and also exact)
relation, to find the canonical partition function for non-symmetrized wave
functions in terms of the corresponding function for fermions and bosons.


title: Transform-limited single photons from a single quantum dot

abstract:
  A semiconductor quantum dot mimics a two-level atom. Performance as a single
photon source is limited by decoherence and dephasing of the optical
transition. Even with high quality material at low temperature, the optical
linewidths are a factor of two larger than the transform-limit. A major
contributor to the inhomogeneous linewdith is the nuclear spin noise. We show
here that the nuclear spin noise depends on optical excitation, increasing
(decreasing) with increasing resonant laser power for the neutral (charged)
exciton. Based on this observation, we discover regimes where we demonstrate
transform-limited linewidths on both neutral and charged excitons even when the
measurement is performed very slowly.


title: Primordial spectra from sudden turning trajectory

abstract:
  Effects of heavy fields on primordial spectra of curvature perturbations are
discussed in inflationary models with a sudden turning trajectory. When heavy
fields are excited after the sudden turn and oscillate around the bottom of the
potential, the following two effects are generically induced: deformation of
the inflationary background spacetime and conversion interactions between
adiabatic and isocurvature perturbations, both of which can affect the
primordial density perturbations. In this paper, we calculate primordial
spectra in inflationary models with sudden turning potentials taking into
account both of the two effects appropriately. We find that there are some
non-trivial correlations between the two effects in the power spectrum and, as
a consequence, the primordial scalar power spectrum has a peak around the scale
exiting the horizon at the turn. Though both effects can induce parametric
resonance amplifications, they are shown to be canceled out for the case with
the canonical kinetic terms. The peak feature and the scale dependence of
bispectra are also discussed.


title: LPCH and UDLPCH: Location-aware Routing Techniques in WSNs

abstract:
  Wireless sensor nodes along with Base Station (BS) constitute a Wireless
Sensor Network (WSN). Nodes comprise of tiny power battery. Nodes sense the
data and send it to BS. WSNs need protocol for efficient energy consumption of
the network. In direct transmission and minimum transmission energy routing
protocols, energy consumption is not well distributed. However, LEACH
(Low-Energy Adaptive Clustering Hierarchy) is a clustering protocol; randomly
selects the Cluster Heads (CHs) in each round. However, random selection of CHs
does not guarantee efficient energy consumption of the network. Therefore, we
proposed new clustering techniques in routing protocols, Location-aware
Permanent CH (LPCH) and User Defined Location-aware Permanent CH (UDLPCH). In
both protocols, network field is physically divided in to two regions, equal
number of nodes are randomly deployed in each region. In LPCH, number of CHs
are selected by LEACH algorithm in first round. However in UDLPCH, equal and
optimum number of CHs are selected in each region, throughout the network life
time number of CHs are remain same. Simulation results show that stability
period and throughput of LPCH is greater than LEACH, stability period and
throughput of UDLPCH is greater than LPCH.


title: A Central Limit Theorem for Periodograms Under Rho-Prime Mixing

abstract:
  This paper consists of a proof of a multivariate Central Limit Theorem for
"rectangular" sums of dependent complex-valued, rho-prime-mixing random
variables indexed by Z^d.


title:
Congruence and Noncongruence Subgroups of Gamma(2) via Graphs on
  Surfaces

abstract:
  There is an established bijection between finite-index subgroups Gamma of
Gamma(2) and bipartite graphs on surfaces, or, equivalently, certain triples of
permutations. We utilize this relationship to study both congruence and
noncongruence subgroups in terms of the corresponding graphs. We show some
elementary criteria which can be used to identify many noncongruence subgroups.
Given a graph on a surface, we have a method to produce generators for the
corresponding group Gamma in terms of the generators of Gamma(2). Given
generators for Gamma(2n), we show how to determine whether or not a graph of
level 2n corresponds to a congruence subgroup.


title:
NMR investigation of the Knight shift anomaly in CeIrIn5 at high
  magnetic fields

abstract:
  We report nuclear magnetic resonance Knight shift data in the heavy fermion
material CeIrIn5 at fields up to 30 T. The Knight shift of the In displays a
strong anomaly, and we analyze the results using two different interpretations.
We find that the Kondo lattice coherence temperature and the effective mass of
the heavy electrons remains largely unaffected by the magnetic field, despite
the fact that the Zeeman energy is on the order of the coherence temperature.


title: Sharp L^p-entropy inequalities on manifolds

abstract:
  \small{In 2004, Del Pino and Dolbeault \cite{DPDo} and Gentil \cite{G}
investigated, independently, best constants and extremals associated to sharp
Euclidean $L^p$-entropy inequalities. In this work, we present some important
advances in the Riemannian context. Namely, let $(M,g)$ be a compact Riemannian
manifold of dimension $n \geq 3$. For $1 < p \leq 2$, we prove that the sharp
Riemannian $L^p$-entropy inequality
  \[\int_M |u|^p \log(|u|^p) dv_g \leq \frac{n}{p} \log ({\cal A}_{opt} \int_M
|\nabla u|_g^p dv_g + {\cal B}) \]
  \n holds on all functions $u \in H^{1,p}(M)$ such that $||u||_{L^p(M)} = 1$.
Moreover, we show that the first best Riemannian constant ${\cal A}_{opt}$ is
equal to the corresponding Euclidean one. Our approach is inspired on the
Bakry, Coulhon, Ledoux and Sallof-Coste's idea \cite{Ba} of getting Euclidean
entropy inequalities as a limit case of suitable Gagliardo-Nirenberg
inequalities. It is conjectured that the above inequality sometimes fails for
$p > 2$.}


title: Star Formation in Two Luminous Spiral Galaxies

abstract:
  We have examined star formation in two very luminous (M_V=-22 to -23) Sc-type
spiral galaxies, NGC 801 and UGC 2885, using ultra-deep Halpha images. We
combine these with UBV and 2MASS JHK images and HI maps to explore the star
formation characteristics of disk galaxies at high luminosity. Halpha traces
star formation in these galaxies to 4-6 disk scale lengths, but the lack of
detection of Halpha further out is likely due to loss of Lyman continuum
photons. Considering gravitational instabilities alone, we find that the gas
and stars in the outer regions are marginally stable in an average sense, but
considering dissipative gas and radial and azimuthal forcing, the outer regions
are marginally unstable to form spiral arms. Star formation is taking place in
spiral arms, which are regions of locally higher gas densities. Furthermore, we
have traced smooth exponential stellar disks over 3-orders of magnitude and 4-6
disk scale lengths, in spite of a highly variable gravitational instability
parameter. Thus, gravitational instability thresholds do not seem relevant to
the stellar disk. One possibility for creating an exponential disk is that the
molecular cloud densities and star formation rates have exponential profiles
and this forces the stellar disk to build up such a profile. Another
possibility is that the stellar disk is continuously adjusted to an exponential
shape regardless of the star formation profile, for example through global
dynamical process that scatter stars. However, such scattering processes are
only known to operate in spiral systems, in which case they cannot explain the
same dilemma of smooth exponential disks observed in dwarf irregular galaxies.


title: Warm-polytropic inflationary universe model

abstract:
  In the present paper we study warm inflationary universe models in the
context of a polytropic gas. We derive the characteristics of this model in
slow-roll approximation and develop our model in two cases, 1- For a constant
dissipative parameter $\Gamma$. 2- $\Gamma$ as a function of scalar field
$\phi$. In these cases we will obtain exact solution for the scalar field and
Hubble parameter. We will also obtain explicit expressions for the
tensor-scalar ratio $R$, scalar spectrum index $n_s$ and its running
$\alpha_s$, in slow-roll approximation.


title: Gardner's Minichess Variant is solved

abstract:
  A 5x5 board is the smallest board on which one can set up all kind of chess
pieces as a start position. We consider Gardner's minichess variant in which
all pieces are set as in a standard chessboard (from Rook to King). This game
has roughly 9x10^{18} legal positions and is comparable in this respect with
checkers. We weakly solve this game, that is we prove its game-theoretic value
and give a strategy to draw against best play for White and Black sides. Our
approach requires surprisingly small computing power. We give a human readable
proof. The way the result is obtained is generic and could be generalized to
bigger chess settings or to other games.


title: Decay properties for functions of matrices over $C^*$-algebras

abstract:
  We extend previous results on the exponential off-diagonal decay of the
entries of analytic functions of banded and sparse matrices to the case where
the matrix entries are elements of a $C^*$-algebra.


title: Dipole Moment Bounds on Dark Matter Annihilation

abstract:
  We consider constraints on simplified models in which scalar dark matter
annihilates to light charged leptons through the exchange of charged mediators.
We find that loop diagrams will contribute corrections to the magnetic and
electric dipole moments of the light charged leptons, and experimental
constraints on these corrections place significant bounds on the dark matter
annihilation cross section. In particular, annihilation to electrons with an
observable cross section would be ruled out, while annihilation to muons is
only permitted if the dominant contributions arise from CP-violating
interactions.


title:
Minimal physical constraints on the angular distributions of two-body
  boson decays

abstract:
  The angular distribution of the two-body decay of a boson of unknown
properties is strongly constrained by angular momentum conservation and
rotation invariance, as well as by the nature of the detected decay particles
and of the colliding ones. Knowing the border between the "physical" and
"unphysical" parameter domains defined by these "minimal constraints"
(excluding specific hypotheses on what is still subject of measurement) is a
useful ingredient in the experimental determinations of angular distributions
and can provide model-independent criteria for spin characterizations. In
particular, analysing the angular decay distribution with the general
parametrization for the J = 2 case can provide a model-independent
discrimination between the J = 0 and J = 2 hypotheses for a particle produced
by two real gluons and decaying into two real photons.


title: The Power of Mediation in an Extended El Farol Game

abstract:
  A mediator implements a correlated equilibrium when it proposes a strategy to
each player confidentially such that the mediator's proposal is the best
interest for every player to follow. In this paper, we present a mediator that
implements the best correlated equilibrium for an extended El Farol game with
symmetric players. The extended El Farol game we consider incorporates both
negative and positive network effects.
  We study the degree to which this type of mediator can decrease the overall
social cost. In particular, we give an exact characterization of Mediation
Value (MV) and Enforcement Value (EV) for this game. MV is the ratio of the
minimum social cost over all Nash equilibria to the minimum social cost over
all mediators, and EV is the ratio of the minimum social cost over all
mediators to the optimal social cost. This sort of exact characterization is
uncommon for games with both kinds of network effects. An interesting outcome
of our results is that both the MV and EV values can be unbounded for our game.