title:
The Dark Energy Cosmic Clock: A New Way to Parametrise the Equation of
  State

abstract:
  We propose a completely new parametrisation of the dark energy equation of
state, which uses the dark energy density, $\Omega_e$ as a cosmic clock. We
expand the equation of state in a series of orthogonal polynomials, with
$\Omega_e$ as the expansion parameter and determine the expansion coefficients
by fitting to SNIa and $H(z)$ data. Assuming that $\Omega_e$ is a monotonic
function of time, we show that our parametrisation performs better than the
popular Chevallier--Polarski--Linder (CPL) and Gerke and Efstathiou (GE)
parametrisations, and we demonstrate that it is robust to the choice of prior.
Expanding in orthogonal polynomials allows us to relate models of dark energy
directly to our parametrisation, which we illustrate by placing constraints on
the expansion coefficients extracted from two popular quintessence models.
Finally, we comment on how this parametrisation could be modified to
accommodate high redshift data, where any non--monotonicity of $\Omega_e$ would
need to be accounted for.


title:
Observation of angle-dependent transmission of Dirac electrons in
  graphene hetero junctions

abstract:
  The relativistic nature of charge carriers in graphene is expected to lead to
an angle- dependent transmission through a potential barrier, where Klein
tunneling involves annihilation of an electron and a hole at the edges of the
barrier. The signatures of Klein tunneling have been observed in gated graphene
devices, but the angle dependence of the transmission probability has not been
directly observed. Here we show measurements of the angle-dependent
transmission through quasi-ballistic graphene heterojunctions with straight and
angled leads, in which the barrier height is controlled by a shared gate
electrode. Using a balanced differential measurement technique, we isolate the
angle-dependent contribution to the resistance from other angle-insensitive,
gate-dependent and device-dependent effects. We find large oscillations in the
transmission as a function of the barrier height in the case of Klein tunneling
at a 45 deg angle, as compared to normal incidence. Our results are consistent
with the model that predicts oscillations of the transmission probability due
to interference of chiral carriers in a ballistic barrier. The observed angle
dependence is the key element behind focusing of electrons and the realization
of a Veselago lens in graphene.


title:
High temperature viscosity measurement system and viscosity of a common
  dielectric liquid

abstract:
  A device to measure viscosity of dielectric oils was developed. The device is
an inset to an autoclave system where the temperature and the pressure could be
controlled. The device is capable of measuring viscosities up to 400C and
5000psi, which are the limits of our autoclave at the moment.


title:
Comparing DNA sequence collections by direct comparison of compressed
  text indexes

abstract:
  Popular sequence alignment tools such as BWA convert a reference genome to an
indexing data structure based on the Burrows-Wheeler Transform (BWT), from
which matches to individual query sequences can be rapidly determined. However
the utility of also indexing the query sequences themselves remains relatively
unexplored.
  Here we show that an all-against-all comparison of two sequence collections
can be computed from the BWT of each collection with the BWTs held entirely in
external memory, i.e. on disk and not in RAM. As an application of this
technique, we show that BWTs of transcriptomic and genomic reads can be
compared to obtain reference-free predictions of splice junctions that have
high overlap with results from more standard reference-based methods.
  Code to construct and compare the BWT of large genomic data sets is available
at http://beetl.github.com/BEETL/ as part of the BEETL library.


title:
Electrical properties of polyetherimide thin films: Nonparametric
  dielectric reponse analysis with distribution of relaxation times

abstract:
  High temperature polymeric materials for electrical insulation and energy
storage are needed for transformational power applications such as pulsed-power
and hyrid electrical vehicles. One of the candidate materials has been
polyetherimide, an amourphous thermoplastic with a glass transition over 200C.
Here dielectric studies on the material are reported by taking into account the
polarization and conduction processes in the polyetherimide.


title:
The HETDEX Pilot Survey. IV. The Evolution of [O II] Emitting Galaxies
  from z ~ 0.5 to z ~ 0

abstract:
  We present an analysis of the luminosities and equivalent widths of the 284 z
< 0.56 [O II]-emitting galaxies found in the 169 square arcmin pilot survey for
the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). By combining
emission-line fluxes obtained from the Mitchell spectrograph on the McDonald
2.7-m telescope with deep broadband photometry from archival data, we derive
each galaxy's de-reddened [O II] 3727 luminosity and calculate its total star
formation rate. We show that over the last ~5 Gyr of cosmic time there has been
substantial evolution in the [O II] emission-line luminosity function, with L*
decreasing by ~0.6 +/-0.2 dex in the observed function, and by ~0.9 +/-0.2 dex
in the de-reddened relation. Accompanying this decline is a significant shift
in the distribution of [O II] equivalent widths, with the fraction of high
equivalent-width emitters declining dramatically with time. Overall, the data
imply that the relative intensity of star formation within galaxies has
decreased over the past ~5 Gyr, and that the star formation rate density of the
universe has declined by a factor of ~2.5 between z ~ 0.5 and z ~ 0. These
observations represent the first [O II]-based star formation rate density
measurements in this redshift range, and foreshadow the advancements which will
be generated by the main HETDEX survey.


title: Return currents and energy transport in the solar flaring atmosphere

abstract:
  According to a standard ohmic perspective, the injection of accelerated
electrons into the flaring region violates local charge equilibrium and
therefore, in response, return currents are driven by an electric field to
equilibrate such charge violation. In this framework, the energy loss rate
associated to these local currents has an ohmic nature and significantly
shortens the acceleration electron path. In the present paper we adopt a
different viewpoint and, specifically, we study the impact of the background
drift velocity on the energy loss rate of accelerated electrons in solar
flares. We first utilize the Rutherford cross-section to derive the formula of
the energy loss rate when the collisional target has a finite temperature and
the background instantaneously and coherently moves up to equilibrate the
electron injection. We then use the continuity equation for electrons and
imaging spectroscopy data provided by RHESSI to validate this model.
Specifically, we show that this new formula for the energy loss rate provides a
better fit of the experimental data with respect to the model based on the
effects of standard ohmic return currents.


title:
Annihilation dynamics of stringlike topological defects in a nematic
  lyotropic liquid crystal

abstract:
  Topological defects can appear whenever there is some type of ordering. Its
ubiquity in nature has been the subject of several studies, from early Universe
to condensed matter. In this work, we investigated the annihilation dynamics of
defects and antidefects in a lyotropic nematic liquid crystal (ternary mixture
of potassium laurate, decanol and deionized-destilated water) using the
polarized optical light microscopy technique. We analyzed Schlieren textures
with topological defects produced due to a symmetry breaking in the transition
of the isotropic to nematic calamitic phase after a temperature quench. As
result, we obtained for the distance D between two annihilating defects
(defect-antidefect pair), as a function of time t remaining for the
annihilation, the scaling law D ~ t^{\alpha}, with \alpha = 0.390 and standard
deviation \sigma = 0.085. Our findings go in the direction to extend
experimental results related to dynamics of defects in liquid crystals since
only thermotropic and polymerics ones had been investigated. In addition, our
results are in good quantitative agreement with previous investigations on the
subject.


title: A Comparison Study of Two Methods for Elliptic Boundary Value Problems

abstract:
  In this paper, we perform a comparison study of two methods (the embedded
boundary method and several versions of the mixed finite element method) to
solve an elliptic boundary value problem.


title: Current Status of Simulations

abstract:
  As the title suggests, the purpose of this chapter is to review the current
status of numerical simulations of black hole accretion disks. This chapter
focuses exclusively on global simulations of the accretion process within a few
tens of gravitational radii of the black hole. Most of the simulations
discussed are performed using general relativistic magnetohydrodynamic (MHD)
schemes, although some mention is made of Newtonian radiation MHD simulations
and smoothed particle hydrodynamics. The goal is to convey some of the exciting
work that has been going on in the past few years and provide some speculation
on future directions.


title: Quantized Friction across Ionic Liquid Thin Films

abstract:
  Ionic liquids, salts in the liquid state under ambient conditions, are of
great interest as precision lubricants. Ionic liquids form layered structures
at surfaces, yet it is not clear how this nano-structure relates to their
lubrication properties. We measured the friction force between atomically
smooth solid surfaces across ionic liquid films of controlled thickness in
terms of the number of ion layers. Multiple friction-load regimes emerge, each
corresponding to a different number of ion layers in the film. In contrast to
molecular liquids, the friction coefficients differ for each layer due to their
varying composition.


title:
Optical properties of Au colloids self-organized into rings via
  copolymer templates

abstract:
  The investigation of the Localized Surface Plasmon Resonance for plasmonic
nanoparticles has opened new perspectives for optical nanosensors. Today, an
issue in plasmonics is the development of large scale and low cost devices. We
focus here on the Langmuir-Blodgett technique to self-organize gold
nanoparticles (~ 7 nm) into rings (~ 60 nm) via
polystyrene-b-polymethylmethacrylate templates. In particular, we investigated
the optical properties of organized gold nanoparticle rings over large areas
and report experimental evidence for plasmon resonances of both individual
nanoparticles and collective modes. This paves the way for designing devices
with multiple resonances in the visible-Infra-red spectrum and developing
optical sensors.


title:
GRHydro: A new open source general-relativistic magnetohydrodynamics
  code for the Einstein Toolkit

abstract:
  We present the new general-relativistic magnetohydrodynamics (GRMHD)
capabilities of the Einstein Toolkit, an open-source community-driven numerical
relativity and computational relativistic astrophysics code. The GRMHD
extension of the Toolkit builds upon previous releases and implements the
evolution of relativistic magnetised fluids in the ideal MHD limit in fully
dynamical spacetimes using the same shock-capturing techniques previously
applied to hydrodynamical evolution. In order to maintain the divergence-free
character of the magnetic field, the code implements both hyperbolic divergence
cleaning and constrained transport schemes. We present test results for a
number of MHD tests in Minkowski and curved spacetimes. Minkowski tests include
aligned and oblique planar shocks, cylindrical explosions, magnetic rotors,
Alfv\'en waves and advected loops, as well as a set of tests designed to study
the response of the divergence cleaning scheme to numerically generated
monopoles. We study the code's performance in curved spacetimes with spherical
accretion onto a black hole on a fixed background spacetime and in fully
dynamical spacetimes by evolutions of a magnetised polytropic neutron star and
of the collapse of a magnetised stellar core. Our results agree well with exact
solutions where these are available and we demonstrate convergence. All code
and input files used to generate the results are available on
http://einsteintoolkit.org. This makes our work fully reproducible and provides
new users with an introduction to applications of the code.


title: Designing Electronic Markets for Defeasible-based Contractual Agents

abstract:
  The design of punishment policies applied to specific domains linking agents
actions to material penalties is an open research issue. The proposed framework
applies principles of contract law to set penalties: expectation damages,
opportunity cost, reliance damages, and party design remedies. In order to
decide which remedy provides maximum welfare within an electronic market, a
simulation environment called DEMCA (Designing Electronic Markets for
Contractual Agents) was developed. Knowledge representation and the reasoning
capabilities of the agents are based on an extended version of temporal
defeasible logic.


title: Solving Wave Equations on Unstructured Geometries

abstract:
  Waves are all around us--be it in the form of sound, electromagnetic
radiation, water waves, or earthquakes. Their study is an important basic tool
across engineering and science disciplines. Every wave solver serving the
computational study of waves meets a trade-off of two figures of merit--its
computational speed and its accuracy. Discontinuous Galerkin (DG) methods fall
on the high-accuracy end of this spectrum. Fortuitously, their computational
structure is so ideally suited to GPUs that they also achieve very high
computational speeds. In other words, the use of DG methods on GPUs
significantly lowers the cost of obtaining accurate solutions. This article
aims to give the reader an easy on-ramp to the use of this technology, based on
a sample implementation which demonstrates a highly accurate, GPU-capable,
real-time visualizing finite element solver in about 1500 lines of code.


title: Simple wavelet sets in R^n

abstract:
  Wavelet sets that are finite unions of convex sets are constructed in
$\mathbb R^n$, $n\geq 2$, for dilation by any expansive matrix that has a power
equal to a scalar times the identity and also has all singular values greater
than $\sqrt n$. In particular, we produce simple wavelet sets in any dimension
for dilation by any real scalar greater than 1.


title:
Reducing the number of ancilla qubits and the gate count required for
  creating large controlled operations

abstract:
  In this paper we show that it is possible to adapt a qudit scheme for
creating a controlled-Toffoli created by Ralph et al. [Phys. Rev. A 75 011213]
to be applicable to qubits. While this scheme requires more gates than standard
schemes for creating large controlled gates, we show that with simple
adaptations it is directly equivalent to the standard scheme in the literature.
This scheme is the most gate-efficient way of creating large controlled
unitaries currently known, however it is expensive in terms of the number of
ancilla qubits used. We go on to show that using a combination of these
standard techniques presented by Barenco et al. [Phys. Rev. A 52 3457 (1995)]
we can create an n-qubit version of the Toffoli using less gates and the same
number of ancilla qubits as recent work using computer optimization. This would
be useful in any architecture of quantum computing where gates are cheap but
qubit initialization is expensive.


title:
Simply transitive quaternionic lattices of rank 2 over F_q(t) and a
  non-classical fake quadric

abstract:
  We construct an infinite series of simply transitive irreducible lattices in
PGL_2(F_q((t))) \times PGL_2(F_q((t))) by means of a quaternion algebra over
F_q(t). The lattices depend on an odd prime power q = p^r and a parameter \tau\
in F_q^* different from 1, and are the fundamental group of a square complex
with just one vertex and universal covering T_{q+1} \times T_{q+1}, a product
of trees with constant valency q + 1.
  Our lattices give rise via non-archimedian uniformization to smooth
projective surfaces of general type over F_q((t)) with ample canonical class,
Chern ratio (c_1)^2/c_2 = 2, trivial Albanese variety and non-reduced Picard
scheme. For q = 3, the Zariski-Euler characteristic attains its minimal value
\chi = 1: the surface is a non-classical fake quadric.


title:
OntoRich - A Support Tool for Semi-Automatic Ontology Enrichment and
  Evaluation

abstract:
  This paper presents the OntoRich framework, a support tool for semi-automatic
ontology enrichment and evaluation. The WordNet is used to extract candidates
for dynamic ontology enrichment from RSS streams. With the integration of
OpenNLP the system gains access to syntactic analysis of the RSS news. The
enriched ontologies are evaluated against several qualitative metrics.


title:
Probing top anomalous couplings at the LHC with trilepton signatures in
  the single top mode

abstract:
  We investigate trilepton final states to probe top anomalous couplings at the
Large Hadron Collider. We focus on events originating from the associated
production of a single top quark with a Z-boson, a channel sensitive to several
flavor-changing neutral interactions of top and up/charm quarks. In particular,
we explore a way to access simultaneously their anomalous couplings to Z-bosons
and gluons and derive the discovery potential of trilepton final states to such
interactions with 20 fb-1 of 8 TeV collisions. We show that effective coupling
strengths of O(0.1-1) TeV-1 can be reached. Equivalently, branching fractions
of top quarks into lighter quarks and gluons or Z-bosons can be constrained to
be below O(0.1-1)%.


title: Anisotropic Heisenberg Model in Thin Film Geometry

abstract:
  The effect of the anisotropy in the exchange interaction on the phase
diagrams and magnetization behavior of the Heisenberg thin film has been
investigated with effective field formulation in a two spin cluster using the
decoupling approximation. Phase diagrams and magnetization behaviors have been
obtained for several different cases, by grouping the systems in accordance
with, whether the surfaces/interior of the film have anisotropic exchange
interaction or not. Particular attention has been paid on the evolution of the
special point coordinate with the anisotropy in the exchange interaction. It
has been concluded that for increasing ratio of the anisotropies in the
exchange interaction between the surface and interior of the film, special
point disappears at a special value of this ratio.


title: GPU Scripting and Code Generation with PyCUDA

abstract:
  High-level scripting languages are in many ways polar opposites to GPUs. GPUs
are highly parallel, subject to hardware subtleties, and designed for maximum
throughput, and they offer a tremendous advance in the performance achievable
for a significant number of computational problems. On the other hand,
scripting languages such as Python favor ease of use over computational speed
and do not generally emphasize parallelism. PyCUDA is a package that attempts
to join the two together. This chapter argues that in doing so, a programming
environment is created that is greater than just the sum of its two parts.
  We would like to note that nearly all of this chapter applies in unmodified
form to PyOpenCL, a sister project of PyCUDA, whose goal it is to realize the
same concepts as PyCUDA for OpenCL.


title: Enacting Social Argumentative Machines in Semantic Wikipedia

abstract:
  This research advocates the idea of combining argumentation theory with the
social web technology, aiming to enact large scale or mass argumentation. The
proposed framework allows mass-collaborative editing of structured arguments in
the style of semantic wikipedia. The long term goal is to apply the abstract
machinery of argumentation theory to more practical applications based on human
generated arguments, such as deliberative democracy, business negotiation, or
self-care. The ARGNET system was developed based on ther Semantic MediaWiki
framework and on the Argument Interchange Format (AIF) ontology.


title: Regular del Pezzo surfaces with irregularity

abstract:
  We construct the first examples of regular del Pezzo surfaces for which the
irregularity (i.e. the dimension of the first cohomology group of the structure
sheaf) is nonzero. We also find a restriction on the integer pairs that are
possible as the anti-canonical degree and irregularity of such a surface.


title:
Active particles under confinement: Aggregation at the wall and gradient
  formation inside a channel

abstract:
  I study the confinement-induced aggregation phenomenon in a minimal model of
self-propelled particles inside a channel. Starting from first principles, I
derive a set of equations that govern the density profile of such a system at
the steady-state, and calculate analytically how the aggregation at the walls
varies with the physical parameters of the system. I also investigate how the
gradient of the particle density varies if the inside of the channel is
partitioned into two regions within which the active particles exhibit distinct
levels of fluctuations in their directions of travel.


title: The Dark Side of Galaxy Color

abstract:
  We present age distribution matching, a theoretical formalism for predicting
how galaxies of luminosity L and color C occupy dark matter halos. Our model
supposes that there are just two fundamental properties of a halo that
determine the color and brightness of the galaxy it hosts: the maximum circular
velocity Vmax, and the redshift z_starve that correlates with the epoch at
which the star formation in the galaxy ceases. The halo property z_starve is
intended to encompass physical characteristics of halo mass assembly that may
deprive the galaxy of its cold gas supply and, ultimately, quench its star
formation. The new, defining feature of the model is that, at fixed luminosity,
galaxy color is in monotonic correspondence with z_starve, with the larger
values of z_starve being assigned redder colors. We populate an N- body
simulation with a mock galaxy catalog based on age distribution matching, and
show that the resulting mock galaxy distribution accurately describes a variety
of galaxy statistics. Our model suggests that halo and galaxy assembly are
indeed correlated. We make publicly available our low-redshift, SDSS M_r <-19
mock galaxy catalog, and main progenitor histories of all z=0 halos, at
http://logrus.uchicago.edu/~aphearin


title:
A probabilistic symbolic algorithm to find the minimum of a polynomial
  function on a basic closed semialgebraic set

abstract:
  We consider the problem of computing the minimum of a polynomial function g
on a basic closed semialgebraic set E in R^n. We present a probabilistic
symbolic algorithm to find a finite set of sample points of the subset E^{min}
of E where the minimum of g is attained, provided that E^{min} is non-empty and
has at least one compact connected component.


title:
Impulsive and Long Duration High-Energy Gamma-ray Emission From the Very
  Bright 2012 March 7 Solar Flares

abstract:
  The Fermi Large Area Telescope (LAT) observed two bright X-class solar flares
on 2012 March 7, and detected gamma-rays up to 4 GeV. We detected gamma-rays
both during the impulsive and temporally-extended emission phases, with
emission above 100 MeV lasting for approximately 20 hours. Accurate
localization of the gamma-ray production site(s) coincide with the solar active
region from which X-ray emissions associated with these flares originated. Our
analysis of the >100 MeV gamma-ray emission shows a relatively rapid monotonic
decrease in flux during the first hour of the impulsive phase, and a much
slower, almost monotonic decrease in flux for the next 20 hours. The spectra
can be adequately described by a power law with a high energy exponential
cutoff, or as resulting from the decay of neutral pions produced by accelerated
protons and ions with an isotropic power-law energy distribution. The required
proton spectrum has a number index ~3, with minor variations during the
impulsive phase, while during the temporally extended phase the spectrum
softens monotonically, starting with index ~4. The >30 MeV proton flux and
spectra observed near the Earth by the GOES satellites also show a monotonic
flux decrease and spectral softening during the extended phase, but with a
harder spectrum, with index ~3. Based on the Fermi-LAT and GOES observations of
the flux and spectral evolution of these bright flares, we explore the relative
merits of prompt and continuous acceleration scenarios, hadronic and leptonic
emission processes, and acceleration at the solar corona by the fast Coronal
Mass Ejections (CME) as explanations for the observations. We conclude that the
most likely scenario is continuous acceleration of protons in the solar corona
which penetrate the lower solar atmosphere and produce pions that decay into
gamma-rays.


title: Indexes for Jumbled Pattern Matching in Strings, Trees and Graphs

abstract:
  We consider how to index strings, trees and graphs for jumbled pattern
matching when we are asked to return a match if one exists. For example, we
show how, given a tree containing two colours, we can build a quadratic-space
index with which we can find a match in time proportional to the size of the
match. We also show how we need only linear space if we are content with
approximate matches.


title:
A Systematic Retrieval Analysis of Secondary Eclipse Spectra I: A
  Comparison of Atmospheric Retrieval Techniques

abstract:
  Spectra of exoplanet atmospheres provide us the opportunity to improve our
understanding of these objects just as remote sensing in our own solar system
has increased our understanding of the solar system bodies. The challenge is to
quantitatively determine the range of temperatures and species abundances
allowed by the data. This challenge is often difficult given the low
information content of most exoplanet spectra which commonly leads to
degeneracies in the interpretation. A variety of temperature and abundance
retrieval approaches have been applied to exoplanet spectra, but no previous
investigations have sought to compare these approaches. In this investigation
we compare three different retrieval methods: Optimal Estimation, Differential
Evolution Markov Chain Monte Carlo, and Bootstrap Monte Carlo. We call our
suite of retrieval algorithms the Caltech Inverse Modeling and Retrieval
Algorithms (CHIMERA). We discuss what we can expect in terms of uncertainties
in abundances and temperatures given current observations as well as potential
future observations and what conclusions can be drawn given those
uncertainties. In general we find that the three approaches agree for high
quality spectra expected to come from potential future spaceborne missions, but
disagree for low quality spectra representative of current observations. We
also show that the Gaussian posterior probability distribution assumption made
in the Optimal Estimation approach is valid for high quality spectral data. We
also discuss the implications of our models for the inferred C to O ratios of
exoplanetary atmospheres, which of course are important for understanding
formation environments. More specifically we show that in the observational
limit of a few photometric points, the retrieved C/O is biased towards values
near solar and near one simply due to the assumption of uninformative priors.


title:
Filtering Random Matrices: The Effect of Incomplete Channel Control in
  Multiple Scattering

abstract:
  We present an analytic random matrix theory for the effect of incomplete
channel control on the measured statistical properties of the scattering matrix
of a disordered multiple-scattering medium. When the fraction of the controlled
input channels, m1, and output channels, m2, is decreased from unity, the
density of the transmission eigenvalues is shown to evolve from the bimodal
distribution describing coherent diffusion, to the distribution characteristic
of uncorrelated Gaussian random matrices, with a rapid loss of access to the
open eigenchannels. The loss of correlation is also reflected in an increase in
the information capacity per channel of the medium. Our results have strong
implications for optical and microwave experiments on diffusive scattering
media.


title: A quantitative evaluation of health care system in US, China, and Sweden

abstract:
  This study is mainly aimed at evaluating the effectiveness of current health
care systems of several representative countries and improving that of the US.
To achieve these goals, a people-oriented non-linear evaluation model is
designed. It comprises one major evaluation metric and four minor metrics. The
major metric is constituted by combining possible factors that most
significantly determine or affect the life expectancy of people in this
country. The four minor metrics evaluate less important aspects of health care
systems and are subordinate to the major one. The authors rank some of the
health care systems in the world according to the major metric and detect
problems in them with the help of minor ones. It is concluded that the health
care system of Sweden scores higher than the US and Chinese system scores lower
than that of the US. Especially, the health care system of US lags behind a
little bit compared with its economic power. At last, it is reasonable for the
American government to optimize the arrangement of funding base on the result
of goal programming model.


title:
Local well-posedness for the $H^2$-critical nonlinear Schr\"odinger
  equation

abstract:
  In this paper, we consider the nonlinear Schr\"odinger equation $iu_t +\Delta
u= \lambda |u|^{\frac {4} {N-4}} u$ in $\R^N $, $N\ge 5$, with $\lambda \in
\C$. We prove local well-posedness (local existence, unconditional uniqueness,
continuous dependence) in the critical space $\dot H^2 (\R^N) $.


title:
Computing Pathways to Systems Biology: Key Contributions of
  Computational Methods in Pathway Identification

abstract:
  Understanding large molecular networks consisting of entities such as genes,
proteins or RNAs that interact in complex ways to drive the cellular machinery
has been an active focus of systems biology. Computational approaches have
played a key role in systems biology by complementing theoretical and
experimental approaches. Here we roadmap some key contributions of
computational methods developed over the last decade in the reconstruction of
biological pathways. We position these contributions in a 'systems biology
perspective' to reemphasize their roles in unraveling cellular mechanisms and
to understand 'systems biology diseases' including cancer.


title: A Markov Model for Ontology Alignment

abstract:
  The explosion of available data along with the need to integrate and utilize
that data has led to a pressing interest in data integration techniques. In
terms of Semantic Web technologies, Ontology Alignment is a key step in the
process of integrating heterogeneous knowledge bases. In this paper, we present
the Edge Confidence technique, a modification and improvement over the popular
Similarity Flooding technique for Ontology Alignment.


title:
Band-Like Transport in High Mobility Unencapsulated Single-Layer MoS2
  Transistors

abstract:
  Ultra-thin MoS2 has recently emerged as a promising two-dimensional
semiconductor for electronic and optoelectronic applications. Here, we report
high mobility (>60 cm2/Vs at room temperature) field-effect transistors that
employ unencapsulated single-layer MoS2 on oxidized Si wafers with a low level
of extrinsic contamination. While charge transport in the sub-threshold regime
is consistent with a variable range hopping model, monotonically decreasing
field-effect mobility with increasing temperature suggests band-like transport
in the linear regime. At temperatures below 100 K, temperature-independent
mobility is limited by Coulomb scattering, whereas, at temperatures above 100
K, phonon-limited mobility decreases as a power law with increasing
temperature.


title: DORI: Distributed Outdoor Robotic Instruments

abstract:
  DORI (Distributed Outdoor Robotic Instruments) is a remotely controlled
vehicle that is designed to simulate a planetary exploration mission. DORI is
equipped with over 20 environmental sensors and can perform basic data
analysis, logging and remote upload. The individual components are distributed
across a fault-tolerant bus for redundancy. A partial sensor list includes
atmospheric pressure, rainfall, wind speed, GPS, gyroscopic inertia, linear
acceleration, magnetic field strength, temperature, laser and ultrasonic
distance sensing, as well as digital audio and video capture. The project uses
recycled consumer electronics devices as a low-cost source for sensor
components. This report describes the hardware design of DORI including sensor
electronics, embedded firmware, and physical construction.


title: Dynamics of Entanglement in one and two-dimensional spin systems

abstract:
  We present a review of dynamics of entanglement in one and two dimensional
systems under the effect of external magnetic field and different degrees of
anisotropy at zero and finite temperatures. Different techniques for treating
the spin systems with large Hilbert space dimensions are discussed such as
trace minimization algorithm, time-evolution matrix transformation and step by
step projection technique.


title: Observations of Gamma-ray Bursts in the Fermi era

abstract:
  The Fermi observatory, with its Gamma-Ray Bursts monitor (GBM) and Large Area
Telescope (LAT), is observing Gamma-ray Bursts with unprecedented spectral
coverage and sensitivity, from ~10 keV to > 300 GeV. In the first 3 years of
the mission it observed emission above 100 MeV from 35 GRBs, an order of
magnitude gain with respect to previous observations in this energy range. In
this paper we review the main results obtained on such sample, highlighting
also the relationships with the low-energy features (as measured by the GBM),
and with measurements from observatories at other wavelengths. We also briefly
discuss prospects for detection of GRBs by future Very-High Energy
observatories such as HAWC and CTA, and by Gravitational Wave experiments.


title: Detecting and realising characteristic classes of manifold bundles

abstract:
  We apply our earlier work on the higher-dimensional analogue of the Mumford
conjecture to two questions. Inspired by work of Ebert we prove non-triviality
of certain characteristic classes of bundles of smooth closed manifolds.
Inspired by work of Church-Farb-Thibault and Church-Crossley-Giansiracusa we
investigate the dependence of characteristic classes of bundles on
characteristic numbers of its fibre, total space and base space.


title: First Passage Properties of Molecular Spiders

abstract:
  Molecular spiders are synthetic catalytic DNA-based nanoscale walkers. We
study the mean first passage time for abstract models of spiders moving on a
finite two-dimensional lattice with various boundary conditions, and compare it
with the mean first passage time of spiders moving on a one-dimensional track.
We evaluate by how much the slowdown on newly visited sites, owing to
catalysis, can improve the mean first passage time of spiders and show that in
one dimension, when both ends of the track are an absorbing boundary, the
performance gain is lower than in two dimensions, when the absorbing boundary
is a circle; this persists even when the absorbing boundary is a single site.


title:
Mean Spectral Energy Distributions and Bolometric Corrections for
  Luminous Quasars

abstract:
  We explore the mid-infrared (mid-IR) through ultraviolet (UV) spectral energy
distributions (SEDs) of 119,652 luminous broad-lined quasars with 0.064<z<5.46
using mid-IR data from Spitzer and WISE, near-infrared data from Two Micron All
Sky Survey and UKIDSS, optical data from Sloan Digital Sky Survey, and UV data
from Galaxy Evolution Explorer. The mean SED requires a bolometric correction
(relative to 2500A) of BC=2.75+-0.40 using the integrated light from 1um-2keV,
and we further explore the range of bolometric corrections exhibited by
individual objects. In addition, we investigate the dependence of the mean SED
on various parameters, particularly the UV luminosity for quasars with 0.5<z<3
and the properties of the UV emission lines for quasars with z>1.6; the latter
is a possible indicator of the strength of the accretion disk wind, which is
expected to be SED dependent. Luminosity-dependent mean SEDs show that,
relative to the high-luminosity SED, low-luminosity SEDs exhibit a harder
(bluer) far-UV spectral slope, a redder optical continuum, and less hot dust.
Mean SEDs constructed instead as a function of UV emission line properties
reveal changes that are consistent with known Principal Component Analysis
(PCA) trends. A potentially important contribution to the bolometric correction
is the unseen extream-UV (EUV) continuum. Our work suggests that
lower-luminosity quasars and/or quasars with disk-dominated broad emission
lines may require an extra continuum component in the EUV that is not present
(or much weaker) in high-luminosity quasars with strong accretion disk winds.
As such, we consider four possible models and explore the resulting bolometric
corrections. Understanding these various SED-dependent effects will be
important for accurate determination of quasar accretion rates.


title:
Maximum-rate Transmission with Improved Diversity Gain for Interference
  Networks

abstract:
  Interference alignment (IA) was shown effective for interference management
to improve transmission rate in terms of the degree of freedom (DoF) gain. On
the other hand, orthogonal space-time block codes (STBCs) were widely used in
point-to-point multi-antenna channels to enhance transmission reliability in
terms of the diversity gain. In this paper, we connect these two ideas, i.e.,
IA and space-time block coding, to improve the designs of alignment precoders
for multi-user networks. Specifically, we consider the use of Alamouti codes
for IA because of its rate-one transmission and achievability of full diversity
in point-to-point systems. The Alamouti codes protect the desired link by
introducing orthogonality between the two symbols in one Alamouti codeword, and
create alignment at the interfering receiver. We show that the proposed
alignment methods can maintain the maximum DoF gain and improve the ergodic
mutual information in the long-term regime, while increasing the diversity gain
to 2 in the short-term regime. The presented examples of interference networks
have two antennas at each node and include the two-user X channel, the
interferring multi-access channel (IMAC), and the interferring broadcast
channel (IBC).


title: Inverse Density as an Inverse Problem: The Fredholm Equation Approach

abstract:
  In this paper we address the problem of estimating the ratio $\frac{q}{p}$
where $p$ is a density function and $q$ is another density, or, more generally
an arbitrary function. Knowing or approximating this ratio is needed in various
problems of inference and integration, in particular, when one needs to average
a function with respect to one probability distribution, given a sample from
another. It is often referred as {\it importance sampling} in statistical
inference and is also closely related to the problem of {\it covariate shift}
in transfer learning as well as to various MCMC methods. It may also be useful
for separating the underlying geometry of a space, say a manifold, from the
density function defined on it.
  Our approach is based on reformulating the problem of estimating
$\frac{q}{p}$ as an inverse problem in terms of an integral operator
corresponding to a kernel, and thus reducing it to an integral equation, known
as the Fredholm problem of the first kind. This formulation, combined with the
techniques of regularization and kernel methods, leads to a principled
kernel-based framework for constructing algorithms and for analyzing them
theoretically.
  The resulting family of algorithms (FIRE, for Fredholm Inverse Regularized
Estimator) is flexible, simple and easy to implement.
  We provide detailed theoretical analysis including concentration bounds and
convergence rates for the Gaussian kernel in the case of densities defined on
$\R^d$, compact domains in $\R^d$ and smooth $d$-dimensional sub-manifolds of
the Euclidean space.
  We also show experimental results including applications to classification
and semi-supervised learning within the covariate shift framework and
demonstrate some encouraging experimental comparisons. We also show how the
parameters of our algorithms can be chosen in a completely unsupervised manner.


title:
Production and decay of for the 125 GeV Higgs boson in the littlest
  Higgs model with T-parity

abstract:
  Motivated by recent search results for the standard model (SM) Higgs boson at
the Large Hadron Collider (LHC), we revisit the Higgs phenomenology in the
littlest Higgs model with T-parity (LHT). We present the signal strength
modifier $\mu$ respectively for the main search channels $qq' \rightarrow
jjh\rightarrow jj\gamma\gamma$, $qq'\rightarrow Vh\rightarrow V\gamma \gamma$,
$qq'\rightarrow Vh \rightarrow Vbb$, $gg\rightarrow h \rightarrow
\gamma\gamma$, and $gg \rightarrow h \rightarrow VV$ in the LHT model. It is
found that an enhancement factor of $1.09-1.56$ in $qq' \rightarrow
jjh\rightarrow jj\gamma\gamma$ channel can be obtained for this model in Case B
with parameter $f$ in the range 1000 GeV$\sim 500$ GeV. However, the rates for
$b\bar{b}$, $\tau\bar{\tau}$ are significantly suppressed relative to the SM
predictions which are still consistent with the current sensitivity. It is
hoped that will be further tested with larger integrated luminosity at the LHC.


title: Distributional Ergodicity in Stored-Energy-Driven L\'evy Flights

abstract:
  We study a class of random walk, the stored-energy-driven L\'evy flight
(SEDLF), whose jump length is determined by a stored energy during a trapped
state. The SEDLF is a continuous-time random walk with jump lengths being
coupled with the trapping times. It is analytically shown that the
ensemble-averaged mean square displacements exhibit subdiffusion as well as
superdiffusion, depending on the coupling parameter. We find that time-averaged
mean square displacements increase linearly with time and the diffusion
coefficients are intrinsically random, a manifestation of {\it distributional
ergodicity}. The diffusion coefficient shows aging in subdiffusive regime,
whereas it increases with the measurement time in superdiffusive regime.


title:
Spectral analysis of non-commutative harmonic oscillators: the lowest
  eigenvalue and no crossing

abstract:
  The lowest eigenvalue of non-commutative harmonic oscillators $Q$ is studied.
It is shown that $Q$ can be decomposed into four self-adjoint operators, and
all the eigenvalues of each operator are simple. We show that the lowest
eigenvalue $E$ of $Q$ is simple. Furthermore a Jacobi matrix representation of
$Q$ is given and spectrum of $Q$ is considered numerically.


title: Quadratic equations in the Grigorchuk group

abstract:
  We provide an algorithm which, for a given quadratic equation in the
Grigorchuk group determines if it has a solution. As a corollary to our
approach, we prove that the group has a finite commutator width.


title:
Antiferromagnetic Exchange Interactions in Ni$_{2}$Mn$_{1.4}$In$_{0.6}$
  ferromagnetic Heusler alloy

abstract:
  Magnetism in Ni-Mn-Z (Z = Ga,In,Sn,Sb) Heusler alloys has so far been
predominantly attributed to Rudermann-Kittel-Kasuya-Yoshida type interactions
between Mn atoms. We investigate magnetic interactions in one such alloy,
Ni$_{2}$Mn$_{1.4}$In$_{0.6}$ and attempt to explain the origin of
antiferromagnetic (AFM) interactions that coexist with ferromagnetic ones.
Through the combination of x-ray absorption spectroscopy and x-ray magnetic
circular dichroism (XMCD), we find that Ni plays an important role along with
Mn in the overall magnetism. A significant hybridization that develops between
Mn and Ni orbitals results in a small antiferromagnetic moment at Ni sites. The
shift in the XMCD hysteresis loops in the martensitic phase suggests that
antiferromagnetism results from superexchange like interactions between Mn
atoms mediated by Ni.


title:
A Field-motion tautological approach and the role of the acceleration in
  setting a quantization condition

abstract:
  In this work is made a reanalysis of the central problem of electrodynamics,
i.e., finding the conditions under which an electromagnetic field generates a
stable mechanical motion and conversely the existence of this field itself can
be consistent with that motion.


title: Organic Topological Insulators in Organometallic Lattices

abstract:
  Topological insulators (TIs) are a recently discovered class of materials
having insulating bulk electronic states but conducting boundary states
distinguished by nontrivial topology. So far, several generations of TIs have
been theoretically predicted and experimentally confirmed, all based on
inorganic materials. Here, based on first-principles calculations, we predict a
family of two-dimensional organic TIs made of organometallic lattices. Designed
by assembling molecular building blocks of triphenyl-metal compounds with
strong spin-orbit coupling into a hexagonal lattice, this new classes of
organic TIs are shown to exhibit nontrivial topological edge states that are
robust against significant lattice strain. We envision that organic TIs will
greatly broaden the scientific and technological impact of TIs.


title: Distributed Low-rank Subspace Segmentation

abstract:
  Vision problems ranging from image clustering to motion segmentation to
semi-supervised learning can naturally be framed as subspace segmentation
problems, in which one aims to recover multiple low-dimensional subspaces from
noisy and corrupted input data. Low-Rank Representation (LRR), a convex
formulation of the subspace segmentation problem, is provably and empirically
accurate on small problems but does not scale to the massive sizes of modern
vision datasets. Moreover, past work aimed at scaling up low-rank matrix
factorization is not applicable to LRR given its non-decomposable constraints.
In this work, we propose a novel divide-and-conquer algorithm for large-scale
subspace segmentation that can cope with LRR's non-decomposable constraints and
maintains LRR's strong recovery guarantees. This has immediate implications for
the scalability of subspace segmentation, which we demonstrate on a benchmark
face recognition dataset and in simulations. We then introduce novel
applications of LRR-based subspace segmentation to large-scale semi-supervised
learning for multimedia event detection, concept detection, and image tagging.
In each case, we obtain state-of-the-art results and order-of-magnitude speed
ups.


title: Impulsive Thermal X-ray Emission from a Low-lying Coronal Loop

abstract:
  Understanding the relationship among different emission components plays an
essential role in the study of particle acceleration and energy conversion in
solar flares. In flares where gradual and impulsive emission components can be
readily identified the impulsive emission has been attributed to non-thermal
particles. We carry out detailed analysis of H\alpha\ and X-ray observations of
a GOES class B microflare loop on the solar disk. The impulsive hard X-ray
emission, however, is found to be consistent with a hot, quasi-thermal origin,
and there is little evidence of emission from chromospheric footpoints, which
challenges conventional models of flares and reveals a class of microflares
associated with dense loops. H\alpha\ observations indicate that the loop lies
very low in the solar corona or even in the chromosphere and both emission and
absorption materials evolve during the flare. The enhanced H\alpha\ emission
may very well originate from the photosphere when the low-lying flare loop
heats up the underlying chromosphere and reduces the corresponding H\alpha\
opacity. These observations may be compared with detailed modeling of flare
loops with the internal kink instability, where the mode remains confined in
space without apparent change in the global field shape, to uncover the
underlying physical processes and to probe the structure of solar atmosphere.


title: Comment on "Spatial Coherence and Optical Beam Shifts"

abstract:
  This comment is to show that our simulation data, based on our theory and
method in Ref. [J. Phys. B 41, 055401 (2008)], are also in agreement with the
experimental data presented for $D_{p}-D_{s}$ in Ref. [Phys. Rev. Lett.
\textbf{109}, 213901 (2012)]. We also demonstrate how to show the effect of
spatial coherence on the GH shifts in this comment, therefore we disagree with
the claims in Ref. [Phys. Rev. Lett. \textbf{109}, 213901 (2012)].


title: Tail bounds for stochastic approximation

abstract:
  Stochastic-approximation gradient methods are attractive for large-scale
convex optimization because they offer inexpensive iterations. They are
especially popular in data-fitting and machine-learning applications where the
data arrives in a continuous stream, or it is necessary to minimize large sums
of functions. It is known that by appropriately decreasing the variance of the
error at each iteration, the expected rate of convergence matches that of the
underlying deterministic gradient method. Conditions are given under which this
happens with overwhelming probability.


title: Color image denoising by chromatic edges based vector valued diffusion

abstract:
  In this letter we propose to denoise digital color images via an improved
geometric diffusion scheme. By introducing edges detected from all three color
channels into the diffusion the proposed scheme avoids color smearing
artifacts. Vector valued diffusion is used to control the smoothing and the
geometry of color images are taken into consideration. Color edge strength
function computed from different planes is introduced and it stops the
diffusion spread across chromatic edges. Experimental results indicate that the
scheme achieves good denoising with edge preservation when compared to other
related schemes.


title: On the second lower quotient of the fundamental group

abstract:
  Let X be a reasonable topological space, G its fundamental group, and D =
(G,G). We express the second quotient D/(D,G) of the lower central series of G
in terms of the homology and cohomology of X . As an example, we recover the
isomorphism D/(D,G) = Z/2 (due to Collino) when X is the Fano surface
parametrizing lines in a cubic threefold.


title:
Ballistic collective group delay and its Goos-H\"{a}nchen component in
  graphene

abstract:
  We theoretically investigate the experimental observable of the ballistic
collective group delay (CGD) of all the particles on the Fermi surface in
graphene. First, we reveal that, lateral Goos-H\"{a}nchen (GH) shifts along
barrier interfaces contribute an inherent component in the individual group
delay (IGD). Then, by linking the complete IGD to spin precession through a
dwell time, we suggest that, the CGD and its GH component can be
electrostatically measured by a conductance difference in a spin-precession
experiment under weak magnetic fields. Such an approach is feasible for almost
arbitrary Fermi energy. We also indicate that, it is a generally nonzero
self-interference delay that relates the IGD and dwell time in graphene.


title:
Distributed Constrained Optimization by Consensus-Based Primal-Dual
  Perturbation Method

abstract:
  Various distributed optimization methods have been developed for solving
problems which have simple local constraint sets and whose objective function
is the sum of local cost functions of distributed agents in a network.
Motivated by emerging applications in smart grid and distributed sparse
regression, this paper studies distributed optimization methods for solving
general problems which have a coupled global cost function and have inequality
constraints. We consider a network scenario where each agent has no global
knowledge and can access only its local mapping and constraint functions. To
solve this problem in a distributed manner, we propose a consensus-based
distributed primal-dual perturbation (PDP) algorithm. In the algorithm, agents
employ the average consensus technique to estimate the global cost and
constraint functions via exchanging messages with neighbors, and meanwhile use
a local primal-dual perturbed subgradient method to approach a global optimum.
The proposed PDP method not only can handle smooth inequality constraints but
also non-smooth constraints such as some sparsity promoting constraints arising
in sparse optimization. We prove that the proposed PDP algorithm converges to
an optimal primal-dual solution of the original problem, under standard problem
and network assumptions. Numerical results illustrating the performance of the
proposed algorithm for a distributed demand response control problem in smart
grid are also presented.


title: Parameterized Complexity of 1-Planarity

abstract:
  We consider the problem of finding a 1-planar drawing for a general graph,
where a 1-planar drawing is a drawing in which each edge participates in at
most one crossing. Since this problem is known to be NP-hard we investigate the
parameterized complexity of the problem with respect to the vertex cover
number, tree-depth, and cyclomatic number. For these parameters we construct
fixed-parameter tractable algorithms. However, the problem remains NP-complete
for graphs of bounded bandwidth, pathwidth, or treewidth.


title:
Simulation study of a photo-injector for brightness improvement in
  Thomson scattering x-ray source via ballistic bunching

abstract:
  Increasing peak brightness is beneficial to various applications of Thomson
scattering x-ray source. Higher peak brightness of scattered x-ray pulse
demands shorter scattering electron beam realized by beam compression in
electron beam-line. In this article, we study the possibility to compress
electron beam in a typical S-band normal conducting photo-injector via
ballistic bunching, through just adding a short RF linac section right behind
the RF gun, so as to improve peak brightness of scattered x-ray pulse.
Numerical optimization by ASTRA demonstrations that peak current can increase
from ~50 A to >300 A for a 500 pC, 10 ps FWHM electron pulse, while normalized
transverse RMS emittance and RMS energy spread increases very little.
Correspondingly, the peak brightness of Thomson scattering x-ray source is
estimated to increase about 3 times.


title: Variation in displacement energies due to isospin nonconserving forces

abstract:
  For mirror nuclei with masses A=42-95, the effects of isospin nonconserving
nuclear forces are studied with nuclear shell model using the Coulomb
displacement energy and triplet displacement energy as probes. It is shown that
the characteristic behavior of the displacement energies can be well reproduced
if the isovector and isotensor nuclear interactions with J=0 and T=1 are
introduced into the f7/2 shell. These forces, with their strengths being found
consistent with the nucleon-nucleon scattering data, tend to modify nuclear
binding energies near the N=Z line. At present, no evidence is found that these
forces are needed for the upper fp-shell. Theoretical one- and two-proton
separation energies are predicted accordingly, and locations of the proton
drip-line are thereby suggested.


title: Dew Point modelling using GEP based multi objective optimization

abstract:
  Different techniques are used to model the relationship between temperatures,
dew point and relative humidity. Gene expression programming is capable of
modelling complex realities with great accuracy, allowing at the same time, the
extraction of knowledge from the evolved models compared to other learning
algorithms. We aim to use Gene Expression Programming for modelling of dew
point. Generally, accuracy of the model is the only objective used by selection
mechanism of GEP. This will evolve large size models with low training error.
To avoid this situation, use of multiple objectives, like accuracy and size of
the model are preferred by Genetic Programming practitioners. Solution to a
multi-objective problem is a set of solutions which satisfies the objectives
given by decision maker. Multi objective based GEP will be used to evolve
simple models. Various algorithms widely used for multi objective optimization,
like NSGA II and SPEA 2, are tested on different test problems. The results
obtained thereafter gives idea that SPEA 2 is better than NSGA II based on the
features like execution time, number of solutions obtained and convergence
rate. We selected SPEA 2 for dew point prediction. The multi-objective base GEP
produces accurate and simpler (smaller) solutions compared to solutions
produced by plain GEP for dew point predictions. Thus multi objective base GEP
produces better solutions by considering the dual objectives of fitness and
size of the solution. These simple models can be used to predict future values
of dew point.


title: Counting generalized Dyck paths

abstract:
  The Catalan number has a lot of interpretations and one of them is the number
of Dyck paths. A Dyck path is a lattice path from $(0,0)$ to $(n,n)$ which is
below the diagonal line $y=x$. One way to generalize the definition of Dyck
path is to change the end point of Dyck path, i.e. we define (generalized) Dyck
path to be a lattice path from $(0,0)$ to $(m,n) \in \mathbb{N}^2$ which is
below the diagonal line $y=\frac{n}{m}x$, and denote by $C(m,n)$ the number of
Dyck paths from $(0,0)$ to $(m,n)$. In this paper, we give a formula to
calculate $C(m,n)$ for arbitrary $m$ and $n$.


title:
Self-excited current oscillations in a resonant tunneling diode
  described by a model based on the Caldeira-Leggett Hamiltonian

abstract:
  The quantum dissipative dynamics of a tunneling process through double
barrier structures is investigated on the basis of non-perturbative and
non-Markovian treatment. We employ a Caldeira-Leggett Hamiltonian with an
effective potential calculated self-consistently, accounting for the electron
distribution. With this Hamiltonian, we use the reduced hierarchy equations of
motion in the Wigner space representation to study non-Markovian and
non-perturbative thermal effects at finite temperature in a rigorous manner. We
study current variation in time and the current-voltage (I-V) relation of the
resonant tunneling diode for several widths of the contact region, which
consists of doped GaAs. Hysteresis and both single and double plateau-like
behavior are observed in the negative differential resistance (NDR) region.
While all of the current oscillations decay in time in the NDR region in the
case of a strong system-bath coupling, there exist self-excited high-frequency
current oscillations in some parts of the plateau in the NDR region in the case
of weak coupling. We find that the effective potential in the oscillating case
possesses a basin-like form on the emitter side (emitter basin) and that the
current oscillation results from tunneling between the emitter basin and the
quantum well in the barriers. We find two distinct types of current
oscillations, with large and small oscillation amplitudes, respectively. These
two types of oscillation appear differently in the Wigner space, with one
exhibiting tornado-like motion and the other exhibiting a two piston
engine-like motion.


title: Surface-Roughness-Limited Mean Free Path in Si Nanowire FETs

abstract:
  The mean free path (MFP) in silicon nanowire field effect transistors limited
by surface roughness scattering (SRS) is calculated with the non-perturbative
approach utilizing the non-equilibrium Green's function method. The entrance
scattering effect associated with finiteness of the channel length is
identified and a method to eliminate it in the calculation of the MFP is
developed. The behavior of the MFP with respect to channel length (L), channel
width (W), and the root-mean-square (RMS) of the surface roughness is
investigated extensively. Our major findings are that the single parameter,
RMS/W, can be used as a good measure for the strength of the SRS effects and
that the overall characteristics of the MFP are determined by the parameter. In
particular, the MFP exponentially decreases with the increase of RMS/W and the
MFP versus the gate electric field shows a distinctively different behavior
depending on whether the strength of the SRS effects measured by RMS/W is
smaller or greater than 0.06.


title:
Mechanical Properties of the Electric Field: A Novel Prediction derived
  from the Field's Mass and Stress

abstract:
  An experiment is proposed which can distinguish between two approaches to the
reality of the electric field, and whether it has mechanical properties such as
mass and stress. A charged pendulum swings within the field of a much larger
charge. The two fields manifest the familiar apparent curvature of their
field-lines, "bent" so as not to cross each other. If this phenomenon is real,
the pendulum's center of mass must be proportionately shifted according to its
lines' curvature. This prediction has no precise counterpart in the
conventional interpretation, where this curvature is a mere superposition of
the two fields' crossing lines. This empirical distinction, meriting test in
itself, further bears on several unresolved issues in classical, quantum and
relativistic electromagnetism.


title: Comptonization efficiencies of the variability classes of GRS 1915+105

abstract:
  The Galactic microquasar GRS 1915+105 exhibits at least seventeen types of
variability classes. Intra and inter class transitions are reported to be
observed within seconds to hours. Since the observation was not continuous,
these classes appeared to be exhibited in a random order. Our goal is to
predict a sequence of these classes. In this paper, we compute the ratio of the
photon counts obtained from the power-law component and the blackbody component
of each class and call this ratio as the `Comptonizing efficiency' (CE) of that
class. We sequence the classes in the ascending order of CE and find that this
sequence matches with a few class transitions observed by RXTE satellite and
IXAE instruments on board IRS-P3. A change in CE corresponds to a change in the
optical depth of the Compton cloud. Our result implies that the optical depth
of the Compton cloud gradually rises as the variability class becomes harder.


title: Adaptive machine and its thermodynamic costs

abstract:
  We study the minimal thermodynamically consistent model for an adaptive
machine that transfers particles from a higher chemical potential reservoir to
a lower one. This model describes essentials of the inhomogeneous catalysis. It
is supposed to function with the maximal current under uncertain chemical
potentials: if they change, the machine tunes its own structure fitting it to
the maximal current under new conditions. This adaptation is possible under two
limitations. (i) The degree of freedom that controls the machine's structure
has to have a stored energy (described via a negative temperature). The origin
of this result is traced back to the Le Chatelier principle. (ii) The machine
has to malfunction at a constant environment due to structural fluctuations,
whose relative magnitude is controlled solely by the stored energy. We argue
that several features of the adaptive machine are similar to those of living
organisms (energy storage, aging).


title:
Classification of one-dimensional superattracting germs in positive
  characteristic

abstract:
  We give a classification of superattracting germs in dimension one over a
complete normed algebraically closed field of positive characteristic up to
conjugacy. In particular we show that formal and analytic classifications
coincide for these germs. We also give a higher dimensional version of some of
these results.


title: Bisimulation-Based Comparisons for Interpretations in Description Logics

abstract:
  We study comparisons between interpretations in description logics with
respect to "logical consequences" of the form of semi-positive concepts (like
semi-positive concept assertions). Such comparisons are characterized by
conditions similar to the ones of bisimulations. The simplest among the
considered logics is a variant of PDL (propositional dynamic logic). The others
extend that logic with inverse roles, nominals, quantified number restrictions,
the universal role, and/or the concept constructor for expressing the local
reflexivity of a role. The studied problems are: preservation of semi-positive
concepts with respect to comparisons, the Hennessy-Milner property for
comparisons, and minimization of interpretations that preserves semi-positive
concepts.


title:
Modelling the spreading rate of controlled communicable epidemics
  through an entropy-based thermodynamic model

abstract:
  A model based on a thermodynamic approach is proposed for predicting the
dynamics of communicable epidemics in a city, when the epidemic is governed by
controlling efforts of multiple scales so that an entropy is associated with
the system. All the epidemic details are factored into a single parameter that
is determined by maximizing the rate of entropy production. Despite the
simplicity of the final model, it predicts the number of hospitalized cases
with a reasonable accuracy, using the data of SARS of the year 2003, once the
inflexion point characterizing the effect of multiple controlling efforts is
known. This model is supposed to be of potential usefulness since epidemics
such as avian influenza like H7H9 in China this year have the risk to become
communicable among human beings.


title: La machine \alpha: mod\`ele g\'en\'erique pour les algorithmes naturels

abstract:
  So far, following the works of A.M. Turing, the algorithms were considered as
the mathematical abstraction from which we could write programs for computers
whose principle was based on the theoretical concept of Turing machine. We
start here from the observation that natural algorithms or rather algorithms of
the nature which are massively parallel, autoadaptative and reproductible, and
for which we do not know how they really work, nor why, are not easily
specified by the current theoretical model of Universal Turing machine, or
Universal Computer. In particular the aspects of communications, evolutionary
rules (rulers), random (unpredictable) events, just like the genetic code, are
taken into account only by subtleties which oblige to break the theory. We
shall propose one \textit{universal model} of algorithm called machine-alpha
which contains and generalizes the existing models. --- Jusqu'ici, suite aux
travaux de A.M.Turing [Turing, 1936], les algorithmes ont \'et\'e vus comme
l'abstraction \`a partir de laquelle on pouvait \'ecrire des programmes pour
des ordinateurs dont le principe \'etait lui-m\^eme issu du concept th\'eorique
de machine de Turing. Nous partons ici du constat que les algorithmes naturels
ou plut\^ot les algorithmes de la nature, massivement parall\`eles,
autoadaptatifs et auto reproductibles, dont on ne sait pas comment ils
fonctionnent r\'eellement, ni pourquoi, ne sont pas ais\'ement sp\'ecifi\'es
par le mod\`ele th\'eorique actuel de Machine de Turing Universelle, ou de
Calculateur Universel ; en particulier les aspects de communications, de
r\`egles \'evolutives, d' \'ev\'enements al\'eatoires, \`a l'image du code
g\'en\'etique, ne sont pris en compte que par ajout d'artifices \`a la
th\'eorie. Nous nous proposons ici de montrer comment aborder ces probl\`emes
en repensant le mod\`ele th\'eorique. Nous proposerons un mod\`ele
d'algorithme, appel\'e ici machine-\alpha qui contient et g\'en\'eralise les
mod\`eles existants.


title:
Cartan-K\"ahler Theory and Applications to Local Isometric and Conformal
  Embedding

abstract:
  This text is the extended version of a talk given at 6th Meeting of
Integrable Systems and Quantum Filed Theory at Peyresq hold from June 10 2006
to June 17, 2006 at Peyresq, France. The goal of this lecture is to give a
brief introduction to Cartan-K\"ahler's theory. As examples to the application
of this theory, we choose the local isometric and conformal embedding. We
provide lots of details and explanations of the calculation and the tools used.


title:
Energy-momentum's local conservation laws and generalized isometric
  embeddings of vector bundles

abstract:
  This text is the extended version of a talk given at the conference Geometry,
Topology, QFT and Cosmology hold from May 28 to May 30, 2008 at the
Observatoire de Paris. Using exterior differential systems, I provide a
positive answer to the generalized isometric embedding problem of vector
bundles, and show how conservation laws for a class of PDE can be constructed,
for instance, for covariant divergence-free energy-momentum tensors.


title:
Electric-Field-Induced Resistive Switching in a Family of Mott
  Insulators : towards Non-Volatile Mott-RRAM Memories

abstract:
  The fundamental building blocks of modern silicon-based microelectronics,
such as double gate transistors in non-volatile Flash memories, are based on
the control of electrical resistance by electrostatic charging. Flash memories
could soon reach their miniaturization limits mostly because reliably keeping
enough electrons in an always smaller cell size will become increasingly
difficult . The control of electrical resistance at the nanometer scale
therefore requires new concepts, and the ultimate resistance-change device is
believed to exploit a purely electronic phase change such as the Mott insulator
to insulator transition [2]. Here we show that application of short electric
pulses allows to switch back and forth between an initial high-resistance
insulating state ("0" state) and a low-resistance "metallic" state ("1" state)
in the whole class of Mott Insulator compounds AM4X8 (A = Ga, Ge; M= V, Nb, Ta;
X = S, Se). We found that electric fields as low as 2 kV/cm induce an
electronic phase change in these compounds from a Mott insulating state to a
metallic-like state. Our results suggest that this transition belongs to a new
class of resistive switching and might be explained by recent theoretical works
predicting that an insulator to metal transition can be achieved by a simple
electric field in a Mott Insulator. This new type of resistive switching has
potential to build up a new class of Resistive Random Access Memory (RRAM) with
fast writing/erasing times (50 ns to 10 {\mu}s) and resistance ratios \Delta
R/R of the order of 25% at room temperature.


title: Isotropization in Chaplygin matter universes connected by a wormhole

abstract:
  Chaplygin anisotropic matter governing the cosmological evolution in two
identical universes with an intermediate static spherically symmetric region is
considered. The static region contains a wormhole allowing one to pass etween
two horizons. The metric in the non-static region represents a kind of an
anisotropic Kantowski-Sachs cosmological model starting from a horizon instead
the initial singularity. A classification of the cosmologies with a monotonic
late stage is presented. It is shown that only one scenario can involve a de
Sitter regime. The scales in the de Sitter phase allows one to describe the
earliest accelerated expansion on the classical level.


title: Variants of a-T-menability for actions on non-commutative Lp spaces

abstract:
  We investigate various characterizations of the Haagerup property (H) for a
second countable locally compact group G, in terms of orthogonal
representations of G on non-commutative Lp spaces. We introduce a variant
(H_Lp) for orthogonal representations with vanishing coefficients on Lp, and
study its relationships with property (H). We also give a characterization of
(H) by the means of strongly mixing actions on a non-commutative Lp space. We
construct proper actions of groups with (H) by affine isometries on some
non-commutative Lp space, such as the Lp space associated to the hyperfinite II
infinite factor.


title:
Tight Performance Bounds for Approximate Modified Policy Iteration with
  Non-Stationary Policies

abstract:
  We consider approximate dynamic programming for the infinite-horizon
stationary $\gamma$-discounted optimal control problem formalized by Markov
Decision Processes. While in the exact case it is known that there always
exists an optimal policy that is stationary, we show that when using value
function approximation, looking for a non-stationary policy may lead to a
better performance guarantee. We define a non-stationary variant of MPI that
unifies a broad family of approximate DP algorithms of the literature. For this
algorithm we provide an error propagation analysis in the form of a performance
bound of the resulting policies that can improve the usual performance bound by
a factor $O(1-\gamma)$, which is significant when the discount factor $\gamma$
is close to 1. Doing so, our approach unifies recent results for Value and
Policy Iteration. Furthermore, we show, by constructing a specific
deterministic MDP, that our performance guarantee is tight.


title:
Locally refined discrete velocity grids for stationary rarefied flow
  simulations

abstract:
  Most of deterministic solvers for rarefied gas dynamics use discrete velocity
(or discrete ordinate) approximations of the distribution function on a
Cartesian grid. This grid must be sufficiently large and fine to describe the
distribution functions at every space position in the computational domain. For
3-dimensional hypersonic flows, like in re-entry problems, this induces much
too dense velocity grids that cannot be practically used, for memory storage
requirements. In this article, we present an approach to generate automatically
a locally refined velocity grid adapted to a given simulation. This grid
contains much less points than a standard Cartesian grid and allows us to make
realistic 3-dimensional simulations at a reduced cost, with a comparable
accuracy.


title:
International scientific cooperation during the 1930s. Bruno Rossi and
  the development of the status of cosmic rays into a branch of physics

abstract:
  During the 1920s and 1930s, Italian physicists established strong
relationships with scientists from other European countries and the United
States. The career of Bruno Rossi, a leading personality in the study of cosmic
rays and an Italian pioneer of this field of research, provides a prominent
example of this kind of international cooperation. Physics underwent major
changes during these turbulent years, and the traditional internationalism of
physics assumed a more institutionalised character. Against this backdrop,
Rossi's early work was crucial in transforming the study of cosmic rays into a
branch of modern physics. His friendly relationships with eminent scientists
-notably Enrico Fermi, Walther Bothe, Werner Heisenberg, Hans Bethe, and Homi
Bhabha- were instrumental both for the exchange of knowledge about experimental
practises and theoretical discussions, and for attracting the attention of
physicists such as Arthur Compton, Louis Leprince-Ringuet, Pierre Auger and
Patrick Blackett to the problem of cosmic rays. Relying on material from
different archives in Europe and United States, this case study aims to provide
a glimpse of the intersection between national and international dimensions
during the 1930s, at a time when the study of cosmic rays was still very much
in its infancy, strongly interlaced with nuclear physics, and full of
uncertain, contradictory, and puzzling results. Nevertheless, as a source of
high-energy particles it became a proving ground for testing the validity of
the laws of quantum electrodynamics, and made a fundamental contribution to the
origins of particle physics.


title:
The Canonical Structure of the First Order Einstein-Hilbert Action with
  a Flat Background

abstract:
  It has been shown that the canonical structure of the first order
Einstein-Hilbert (1EH) action involves three generations of constraints and
that these can be used to find the generator of a gauge transformation which
leaves the action invariant; this transformation is a diffeomorphism with
field-dependent gauge function while on shell. In this paper we examine the
relationship between the canonical structure of this action and that of the
first order spin-2 (1S2) action, which is the weak field limit of the
Einstein-Hilbert action. We find that the weak field limit of the Possion
Brackets (PB) algebra of first class constraints associated with the 1EH action
is not that of the 1S2 action.


title:
Upper limit on the flux of photons with energies above 10^19 eV using
  the Telescope Array surface detector

abstract:
  We search for ultra-high energy photons by analyzing geometrical properties
of shower fronts of events registered by the Telescope Array surface detector.
By making use of an event-by-event statistical method, we derive upper limits
on the absolute flux of primary photons with energies above 10^19, 10^19.5 and
10^20 eV based on the first three years of data taken.


title: Catalan satisfiability problem

abstract:
  An and/or tree is usually a binary plane tree, with internal nodes labelled
by logical connectives, and with leaves labelled by literals chosen in a fixed
set of k variables and their negations. In the present paper, we introduce the
first model of such Catalan trees, whose number of variables k_n is a function
of n, the size of the expressions. We describe the whole range of the
probability distributions depending on the function k_n, as soon as it tends
jointly with n to infinity. As a by-product we obtain a study of the
satisfiability problem in the context of Catalan trees.
  Our study is mainly based on analytic combinatorics and extends the Kozik's
pattern theory, first developed for the fixed-k Catalan tree model.


title:
Multiplicative Hom-Lie superalgebra structures on infinite dimensional
  simple Lie superalgebras of vector fields

abstract:
  This paper considers the multiplicative Hom-Lie superalgebra structures on
infinite dimensional simple Lie superalgebras of vector fields with
characteristic zero. The main result is that there is only the multiplicative
Hom-Lie superalgebra structure on these Lie superalgebras.


title: Another Asymptotic Notation : "Almost"

abstract:
  Asymptotic notations are heavily used while analysing runtimes of algorithms.
Present paper argues that some of these usages are non trivial, therefore
incurring errors in communication of ideas. After careful reconsidera- tion of
the various existing notations a new notation is proposed. This notation has
similarities with the other heavily used notations like Big-Oh, Big Theta,
while being more accurate when describing the order relationship. It has been
argued that this notation is more suitable for describing algorithm runtime
than Big-Oh.


title: Maximal Subalgebras for Lie Superalgebras of Cartan Type

abstract:
  The maximal graded subalgebras for four families of Lie superalgebras of
Cartan type over a field of prime characteristic are studied. All maximal
reducible graded subalgebras are described completely and their isomorphism
classes, dimension formulas are found. The classification of maximal
irreducible graded subalgebras is reduced to the classification of the maximal
irreducible subalgebras for the classical Lie superalgebras $\frak{gl}(m,n)$,
$\frak{sl}(m,n)$ and $\frak{osp}(m,n)$.


title: Length spectra and strata of flat metrics

abstract:
  In this paper we consider strata of flat metrics coming from quadratic
differentials (semi-translation structures) on surfaces of finite type. We
provide a necessary and sufficient condition for a set of simple closed curves
to be spectrally rigid over a stratum with enough complexity, extending a
result of Duchin-Leininger-Rafi. Specifically, for any stratum with more zeroes
than the genus, the length spectrum of a set of simple closed curves determines
the flat metric in the stratum if and only if the set is dense in the
projective measured foliation space. We also prove that flat metrics in any
stratum are locally determined by the length spectrum of a finite set of closed
curves.


title: Isomorphic Strategy Spaces in Game Theory

abstract:
  This book summarizes ongoing research introducing probability space
isomorphic mappings into the strategy spaces of game theory. This approach is
motivated by discrepancies between probability theory and game theory when
applied to the same strategic situation. In particular, probability theory and
game theory can disagree on calculated values of the Fisher information, the
log likelihood function, entropy gradients, the rank and Jacobian of variable
transforms, and even the dimensionality and volume of the underlying
probability parameter spaces. These differences arise as probability theory
employs structure preserving isomorphic mappings when constructing strategy
spaces to analyze games. In contrast, game theory uses weaker mappings which
change some of the properties of the underlying probability distributions
within the mixed strategy space. Here, we explore how using strong isomorphic
mappings to define game strategy spaces can alter rational outcomes in simple
games . Specific example games considered are the chain store paradox, the
trust game, the ultimatum game, the public goods game, the centipede game, and
the iterated prisoner's dilemma. In general, our approach provides rational
outcomes which are consistent with observed human play and might thereby
resolve some of the paradoxes of game theory.


title: Gauge Symmetries in Heterotic Asymmetric Orbifolds

abstract:
  We study heterotic asymmetric orbifold models. By utilizing the lattice
engineering technique, we classify (22,6)-dimensional Narain lattices with
right-moving non-Abelian group factors which can be starting points for Z3
asymmetric orbifold construction. We also calculate gauge symmetry breaking
patterns.


title:
The influence of interplanar coupling on the entropy and specific heat
  of the bilayer ferromagnet

abstract:
  The Pair Approximation method is applied to studies of the magnetic
Ising-Heisenberg bilayer with simple cubic structure and spin $S=1/2$. The
method allows to take into account quantum effects related to Heisenberg
couplings. In the paper the entropy and magnetic contribution to the specific
heat are calculated. A special attention is paid to the case when the planes
are magnetically non-equivalent and the interplanar coupling is relatively
weak. A double peak structure in the temperature dependence of the specific
heat and the entropy change in the external field is found. When the system is
strongly anisotropic (the case of Ising couplings) the Exact Calculations for
Finite Cluster are performed for comparison with the Pair Approximation method.


title: Supersingular K3 Surfaces are Unirational

abstract:
  We show that supersingular K3 surfaces in characteristic $p\geq5$ are related
by purely inseparable isogenies. This implies that they are unirational, which
proves conjectures of Artin, Rudakov, Shafarevich, and Shioda. As a byproduct,
we exhibit the moduli space of rigidified K3 crystals as an iterated
$\mathbb{P}^1$-bundle over $\mathbb{F}_{p^2}$. To complete the picture, we also
establish Shioda-Inose type isogeny theorems for K3 surfaces with Picard rank
$\rho\geq19$ in positive characteristic.


title: Exotic hadron holography from anomalous dimensions

abstract:
  The anomalous dimensions of hadronic interpolators contain dynamical
information on the properties of the associated hadron states. We point out
that they provide, in particular, a link by which gauge-invariant information
on exotic contributions to hadronic wavefunctionals can be obtained from
approximate gravity duals for QCD. This is demonstrated by the holographic
description of a dominant tetraquark component in the lightest scalar mesons.


title: Online Makespan Minimization with Parallel Schedules

abstract:
  In online makespan minimization a sequence of jobs $\sigma = J_1,..., J_n$
has to be scheduled on $m$ identical parallel machines so as to minimize the
maximum completion time of any job. We investigate the problem with an
essentially new model of resource augmentation. Here, an online algorithm is
allowed to build several schedules in parallel while processing $\sigma$. At
the end of the scheduling process the best schedule is selected. This model can
be viewed as providing an online algorithm with extra space, which is invested
to maintain multiple solutions. The setting is of particular interest in
parallel processing environments where each processor can maintain a single or
a small set of solutions.
  We develop a $(4/3+\eps)$-competitive algorithm, for any $0<\eps\leq 1$, that
uses a number of $1/\eps^{O(\log (1/\eps))}$ schedules. We also give a
$(1+\eps)$-competitive algorithm, for any $0<\eps\leq 1$, that builds a
polynomial number of $(m/\eps)^{O(\log (1/\eps) / \eps)}$ schedules. This value
depends on $m$ but is independent of the input $\sigma$. The performance
guarantees are nearly best possible. We show that any algorithm that achieves a
competitiveness smaller than 4/3 must construct $\Omega(m)$ schedules. Our
algorithms make use of novel guessing schemes that (1) predict the optimum
makespan of a job sequence $\sigma$ to within a factor of $1+\eps$ and (2)
guess the job processing times and their frequencies in $\sigma$. In (2) we
have to sparsify the universe of all guesses so as to reduce the number of
schedules to a constant.
  The competitive ratios achieved using parallel schedules are considerably
smaller than those in the standard problem without resource augmentation.


title:
Path Integral Representation of Lorentzian Spinfoam Model, Asymptotics,
  and Simplicial Geometries

abstract:
  A new path integral representation of Lorentzian Engle-Pereira-Rovelli-Livine
(EPRL) spinfoam model is derived by employing the theory of unitary
representation of SL(2,$\mathbb{C}$). The path integral representation is taken
as a starting point of semiclassical analysis. The relation between the
spinfoam model and classical simplicial geometry is studied via the large spin
asymptotic expansion of the spinfoam amplitude with all spins uniformaly large.
More precisely in the large spin regime, there is an equivalence between the
spinfoam critical configuration (with certain nondegeneracy assumption) and a
classical Lorentzian simplicial geometry. Such an equivalence relation allows
us to classify the spinfoam critical configurations by their geometrical
interpretations, via two types of solution-generating maps. The equivalence
between spinfoam critical configuration and simplical geometry also allows us
to define the notion of globally oriented and time-oriented spinfoam critical
configuration. It is shown that only at the globally oriented and time-oriented
spinfoam critical configuration, the leading order contribution of spinfoam
large spin asymptotics gives precisely an exponential of Lorentzian Regge
action of General Relativity. At all other (unphysical) critical
configurations, spinfoam large spin asymptotics modifies the Regge action at
the leading order approximation.


title: On Spinfoam Models in Large Spin Regime

abstract:
  We study the semiclassical behavior of Lorentzian
Engle-Pereira-Rovelli-Livine (EPRL) spinfoam model, by taking into account the
sum over spins in the large spin regime. We also employ the method of
stationary phase analysis with parameters and the so called, almost-analytic
machinery, in order to find the asymptotic behavior of the contributions from
all possible large spin configurations in the spinfoam model. The spins
contributing the sum are written as ${J}_f=\lambda {j}_f$ where $\l$ is a large
parameter resulting in an asymptotic expansion via stationary phase
approximation. The analysis shows that at least for the simplicial Lorentzian
geometries (as spinfoam critical configurations), they contribute the leading
order approximation of spinfoam amplitude only when their deficit angles
satisfy $\gamma{\Theta}_f\leq\lambda^{-1/2}$ mod $4\pi\mathbb{Z}$. Our analysis
results in a curvature expansion of the semiclassical low energy effective
action from the spinfoam model, where the UV modifications of Einstein gravity
appear as subleading high-curvature corrections.


title:
Semiclassical Analysis of Spinfoam Model with a Small Barbero-Immirzi
  Parameter

abstract:
  We study the semiclassical behavior of Lorentzian
Engle-Pereira-Rovelli-Livine (EPRL) spinfoam model, by taking into account of
the sum over spins in the large spin regime. The large spin parameter \lambda
and small Barbero-Immirzi parameter \gamma are treated as two independent
parameters for the asymptotic expansion of spinfoam state-sum (such an idea was
firstly pointed out in arXiv:1105.0216). Interestingly, there are two different
spin regimes: 1<<\gamma^{-1}<<\lambda<<\gamma^{-2} and \lambda>\gamma^{-2}. The
model in two spin regimes has dramatically different number of effective
degrees of freedom. In 1<<\gamma^{-1}<<\lambda<<\gamma^{-2}, the model produces
in the leading order a functional integration of Regge action, which gives the
discrete Einstein equation for the leading contribution. There is no
restriction of Lorentzian deficit angle in this regime. In the other regime
\lambda>\gamma^{-2}, only small deficit angle is allowed
|\Theta_f|<<\gamma^{-1}\lambda^{1/2}$ mod 4\pi Z. When spins go even larger,
only zero deficit angle mod 4\pi Z is allowed asymptotically. In the transition
of the two regimes, only the configurations with small deficit angle can
contribute, which means one need a large triangulation in order to have
oscillatory behavior of the spinfoam amplitude.


title: Art History on Wikipedia, a Macroscopic Observation

abstract:
  How are articles about art historical actors interlinked within Wikipedia?
Lead by this question, we seek an overview on the link structure of a domain
specific subset of Wikipedia articles. We use an established domain-specific
person name authority, the Getty Union List of Artist Names (ULAN), in order to
externally identify relevant actors. Besides containing consistent biographical
person data, this database also provides associative relationships between its
person records, serving as a reference link structure for comparison. As a
first step, we use mappings between the ULAN and English Dbpedia provided by
the Virtual Internet Authority File (VIAF). This way, we are able to identify
18,002 relevant person articles. Examining the link structure between these
resources reveals interesting insight about the high level structure of art
historical knowledge as it is represented on Wikipedia.


title: The $AdS_{5}xS^(5)$ fermionic model

abstract:
  We consider the $AdS_{5}xS^(5)$ integrable model. As it turns out, relying on
well known arguments, we claim that the conformally invariant fermionic model
is solvable, the resulting solution given in terms of two current algebras
realizations.


title: Effective potential and Goldstone bosons in de Sitter space

abstract:
  We investigate nonperturbative infrared effects for the O(N) linear sigma
model in de Sitter space using the two-particle irreducible effective action at
the Hartree truncation level. This approximation resums the infinite series of
so-called superdaisy diagrams. For the proper treatment of ultraviolet
divergences, we first study the renormalization of this approximation on a
general curved background. Then, we calculate radiatively corrected masses and
the effective potential. As a result, spontaneous symmetry breaking is
possible, on the other hand, the Goldstone modes acquire a positive definite
mass term due to the screening effects of interaction. Possible infrared
divergence is self-regulated by the mass term. Furthermore, there is a symmetry
restoring phase transition as a function of the Hubble parameter. In our
approximation, the phase transition is of first order.


title: Search for the Cosmic Neutrino Background and KATRIN

abstract:
  The spectrum of the Cosmic Microwave Background follows Planck's black body
radiation formula and shows a remarkable constant temperature of T = 2.7. About
380 000 years after the Big Bang at a temperature of T = 3000 Kelvin in the
matter dominated era the electrons combine with the protons and 4He and the
photons move freely in the neutral universe. So the temperature and
distribution of the photons give us information of the universe 380 000 years
after the Big Bang. Information about earlier times can, in principle, be
derived from the Cosmic Neutrino Background (relic neutrinos). The neutrinos
decouple already about 1 second after the Big Bang at a temperature of around 1
MeV or 10^{10} Kelvin. Today their temperature is about 1.95 Kelvin.
Registration of these neutrinos is an extremely challenging experimental
problem, which can hardly be solved with the present technologies. On the other
hand it represents a tempting opportunity to check one of key elements of the
Big Bang Cosmology and to probe the early stages of the universe evolution. The
search for the Cosmic Neutrino Background with the induced beta decay: relic
neutrino + 3H --> 3He + e-, is the topic of this contribution. The signal would
show up as a peak in the electron spectrum by an energy with the neutrino mass
above the Q value. We discuss the prospects of this approach and argue that it
is able to set limits on the Cosmic Neutrino density in our vicinity. We also
discuss critically ways to increase with modifications of the present KATRIN
spectrometer the Tritium source intensity by a factor 100, which would yield
about 170 counts of relic neutrino captures per year. Presently such an
increase of the Tritium source intensity seems not to be possible. But one
should be able to find an upper limit for the local density of the relic
neutrinos in our galaxy.


title:
Tighter Upper Bounds for the Minimum Number of Calls and Rigorous
  Minimal Time in Fault-Tolerant Gossip Schemes

abstract:
  The gossip problem (telephone problem) is an information dissemination
problem in which each of $n$ nodes of a communication network has a unique
piece of information that must be transmitted to all the other nodes using
two-way communications (telephone calls) between the pairs of nodes. During a
call between the given two nodes, they exchange the whole information known to
them at that moment. In this paper we investigate the $k$-fault-tolerant gossip
problem, which is a generalization of the gossip problem, where at most $k$
arbitrary faults of calls are allowed. The problem is to find the minimal
number of calls $\tau(n,k)$ needed to guarantee the $k$-fault-tolerance. We
construct two classes of $k$-fault-tolerant gossip schemes (sequences of calls)
and found two upper bounds of $\tau(n,k)$, which improve the previously known
results. The first upper bound for general even $n$ is $\tau(n,k) \leq 1/2 n
\lceil\log_2 n\rceil + 1/2 n k$. This result is used to obtain the upper bound
for general odd $n$. From the expressions for the second upper bound it follows
that $\tau(n,k) \leq 2/3 n k + O(n)$ for large $n$. Assuming that the calls can
take place simultaneously, it is also of interest to find $k$-fault-tolerant
gossip schemes, which can spread the full information in minimal time. For even
$n$ we showed that the minimal time is $T(n,k)=\lceil\log_2 n\rceil + k$.


title: A Survey on Multi-view Learning

abstract:
  In recent years, a great many methods of learning from multi-view data by
considering the diversity of different views have been proposed. These views
may be obtained from multiple sources or different feature subsets. In trying
to organize and highlight similarities and differences between the variety of
multi-view learning approaches, we review a number of representative multi-view
learning algorithms in different areas and classify them into three groups: 1)
co-training, 2) multiple kernel learning, and 3) subspace learning. Notably,
co-training style algorithms train alternately to maximize the mutual agreement
on two distinct views of the data; multiple kernel learning algorithms exploit
kernels that naturally correspond to different views and combine kernels either
linearly or non-linearly to improve learning performance; and subspace learning
algorithms aim to obtain a latent subspace shared by multiple views by assuming
that the input views are generated from this latent subspace. Though there is
significant variance in the approaches to integrating multiple views to improve
learning performance, they mainly exploit either the consensus principle or the
complementary principle to ensure the success of multi-view learning. Since
accessing multiple views is the fundament of multi-view learning, with the
exception of study on learning a model from multiple views, it is also valuable
to study how to construct multiple views and how to evaluate these views.
Overall, by exploring the consistency and complementary properties of different
views, multi-view learning is rendered more effective, more promising, and has
better generalization ability than single-view learning.