title: Empirical Analysis and Evolving Model of Bipartite Networks

abstract:
  Many real-world networks display a natural bipartite structure. Investigating
it based on the original structure is helpful to get deep understanding about
the networks. In this paper, some real-world bipartite networks are collected
and divided into two types, dependence bipartite networks and independence
bipartite networks, according to the different relation of two sets of nodes.
By analyzing them, the results show that the actors nodes have scale-free
property in the dependence networks, and there is no accordant degree
distribution in the independence networks for both two types of nodes. In order
to understand the scale-free property of actors in dependence networks, two
growing bipartite models without the preferential attachment principle are
proposed. The models show the scale-free phenomena in actors' degree
distribution. It also gives well qualitatively consistent behavior with the
empirical results.


title:
On the isolated singularities of the solutions of the Gaussian curvature
  equation for nonnegative curvature

abstract:
  The precise asymptotic behaviour of the solutions to the twodimensional
curvature equation $\Delta u=k(z) e^{2 u}$ with $e^{2 u} \in L^1$ for bounded
nonnegative curvature functions $-k(z)$ near isolated singularities is
obtained.


title:
Electron self-energy in the presence of magnetic field: hyperfine
  splitting and g factor

abstract:
  A high-precision numerical calculation is reported for the self-energy
correction to the hyperfine splitting and to the bound-electron g factor in
hydrogenlike ions with low nuclear charge numbers. The binding nuclear Coulomb
field is treated to all orders, and the nonperturbative remainder beyond the
known $Z\alpha$-expansion coefficients is determined. For the $^3{\rm He}^+$
ion, the nonperturbative remainder yields a contribution of -450 Hz to the
normalized difference of the 1S and 2S hyperfine-structure intervals, to be
compared with the experimental uncertainty of 71 Hz and with the theoretical
error of 50 Hz due to other contributions. In the case of the g factor, the
calculation provides the most stringent test of equivalence of the perturbative
and nonperturbative approaches reported so far in the bound-state QED
calculations.


title: PT-symmetric Sturmians

abstract:
  Sturmian bound states emerging at a fixed energy and numbered by a complete
set of real eigencouplings are considered. For Sturm-Schroedinger equations
which are manifestly non-Hermitian we outline the way along which the correct
probabilistic interpretation of the system can constructively be re-established
via a new formula for the metric. PT-symmetrized Coulomb potential is chosen
for illustration purposes.


title: Glasma flux tubes and the near side ridge phenomenon at RHIC

abstract:
  We investigate the consequences of long range rapidity correlations in the
Glasma. Particles produced locally in the transverse plane are correlated by
approximately boost invariant flux tubes of longitudinal color electric and
magnetic fields that are formed when two sheets of Colored Glass Condensate
pass through one another, each acquiring a modified color charge density in the
collision. We argue that such long range rapidity correlations persist during
the evolution of the Quark Gluon Plasma formed later in the collision. When
combined with transverse flow, these correlations reproduce many of the
features of the recently observed ridge events in heavy ion collisions at RHIC.


title:
Multi-step VLBI observations of weak extragalactic radio sources to
  align the ICRF and the future GAIA frame

abstract:
  The space astrometry mission GAIA will construct a dense optical QSO-based
celestial reference frame. For consistency between optical and radio positions,
it will be important to align the GAIA frame and the International Celestial
Reference Frame (ICRF) with the highest accuracy. Currently, it is found that
only 10% of the ICRF sources are suitable to establish this link, either
because they are not bright enough at optical wavelengths or because they have
significant extended radio emission which precludes reaching the highest
astrometric accuracy. In order to improve the situation, we have initiated a
VLBI survey dedicated to finding additional suitable radio sources for aligning
the two frames. The sample consists of about 450 sources, typically 20 times
weaker than the current ICRF sources (down to the 20 mJy flux level), which
have been selected by cross-correlating optical and radio catalogues. This
paper presents the observing strategy to detect, image, and measure accurate
positions for these sources. It will also provide results about the VLBI
detectability of the sources, as derived from initial observations with the
European VLBI Network in June and October 2007. Based on these observations, an
excellent detection rate of 89% is found, which is very promising for the
continuation of this project.


title: An $\tilde{O}(n^{2.5})$-Time Algorithm for Online Topological Ordering

abstract:
  We present an $\tilde{O}(n^{2.5})$-time algorithm for maintaining the
topological order of a directed acyclic graph with $n$ vertices while inserting
$m$ edges.


title: On the supersymmetric nonlinear evolution equations

abstract:
  Supersymmetrization of a nonlinear evolution equation in which the bosonic
equation is independent of the fermionic variable and the system is linear in
fermionic field goes by the name B-supersymmetrization. This special type of
supersymmetrization plays a role in superstring theory. We provide
B-supersymmetric extension of a number of quasilinear and fully nonlinear
evolution equations and find that the supersymmetric system follows from the
usual action principle while the bosonic and fermionic equations are
individually non Lagrangian in the field variable. We point out that
B-supersymmetrization can also be realized using a generalized Noetherian
symmetry such that the resulting set of Lagrangian symmetries coincides with
symmetries of the bosonic field equations. This observation provides a basis to
associate the bosonic and fermionic fields with the terms of bright and dark
solitons. The interpretation sought by us has its origin in the classic work of
Bateman who introduced a reverse-time system with negative friction to bring
the linear dissipative systems within the framework of variational principle.


title:
Image Processing in Optical Guidance for Autonomous Landing of Lunar
  Probe

abstract:
  Because of the communication delay between earth and moon, the GNC technology
of lunar probe is becoming more important than ever. Current navigation
technology is not able to provide precise motion estimation for probe landing
control system Computer vision offers a new approach to solve this problem. In
this paper, author introduces an image process algorithm of computer vision
navigation for autonomous landing of lunar probe. The purpose of the algorithm
is to detect and track feature points which are factors of navigation. Firstly,
fixation areas are detected as sub-images and matched. Secondly, feature points
are extracted from sub-images and tracked. Computer simulation demonstrates the
result of algorithm takes less computation and fulfils requests of navigation
algorithm.


title: A 2 PN/RM metric of General Relativity

abstract:
  We present a derivation of 2PN/RM metric field equations from the Einstein
field equation in General Relativity. We use the exponential parametrization
and the $c^{-3}$ isotropic spatial coordinates such as in IAU2000
recommendations.


title:
Current-induced domain wall motion in a nanowire with perpendicular
  magnetic anisotropy

abstract:
  We study theoretically the current-induced magnetic domain wall motion in a
metallic nanowire with perpendicular magnetic anisotropy. The anisotropy can
reduce the critical current density of the domain wall motion. We explain the
reduction mechanism and identify the maximal reduction conditions. This result
facilitates both fundamental studies and device applications of the current-
induced domain wall motion.


title: Cosmological parameters from WMAP 5-year temperature maps

abstract:
  I calculate a hybrid cross-power spectrum estimator from the WMAP 5-year CMB
temperature maps, discuss the goodness of fit, and then constrain cosmological
parameters. The spectrum and results are generally consistent with previous
results, though the power spectrum error bars are slightly smaller and there
are small shifts at high ell. The small improvement in error bars is obtained
at very low numerical cost but does not significantly improve parameter
constraints. I discuss the accuracy of the likelihood model and how constraints
on the optical depth translate into constraints on the reionization history
allowing for helium reionization. In the appendices I propose a simple
reionization parameterization that determines the history in terms of a
mid-point reionization redshift, and suggest a new likelihood approximation for
chi-squared-like distributions with varying skewness.


title: The Phoenix Deep Survey: Extremely Red Galaxies and Cluster Candidates

abstract:
  We present the results of a study of a sample of 375 Extremely Red Galaxies
(ERGs) in the Phoenix Deep Survey, 273 of which constitute a subsample which is
80% complete to K_s = 18.5 over an area of 1160 arcmin^2. The angular
correlation function for ERGs is estimated, and the association of ERGs with
faint radio sources explored. We find tentative evidence that ERGs and faint
radio sources are associated at z > 0.5. A new overdensity-mapping algorithm
has been used to characterize the ERG distribution, and identify a number of
cluster candidates, including a likely cluster containing ERGs at 0.5 < z < 1.
Our algorithm is also used in an attempt to probe the environments in which
faint radio sources and ERGs are associated. We find limited evidence that the
I - K_s > 4 criterion is more efficient than R - K_s > 5 at selecting dusty
star-forming galaxies, rather than passively evolving ERGs.


title:
Functional inequalities derived from the Brunn-Minkowski inequalities
  for quermassintegrals

abstract:
  We use Brunn-Minkowski inequalities for quermassintegrals to deduce a family
of inequalities of Poincar\'e type on the unit sphere and on the boundary of
smooth convex bodies in the $n$-dimensional Euclidean space.


title:
Comparison of Various Methods for the Calculation of the Distance
  Potential Field

abstract:
  The distance from a given position toward one or more destinations, exits,
and way points is a more or less important input variable in most models of
pedestrian dynamics. Except for the special case when there are no obstacles in
a concave scenario -- i.e. each position is visible from any other -- the
calculation of these distances is a non-trivial task. This isn't that big a
problem, as long as the model only demands the distances to be stored in a
Static Floor Field also called Potential Field, which never changes throughout
the whole simulation. In this case a pre-calculation once before the simulation
starts is sufficient. But if one wants to allow changes of the geometry during
a simulation run -- imagine doors or the blocking of a corridor due to some
hazard -- in the Distance Potential Field, calculation time matters strongly.
This contribution gives an overview over existing and new exact and approximate
methods to calculate a potential field, analytical investigations for their
exactness, and tests of their computation speed. The advantages and drawbacks
of the methods are discussed.


title:
Evidence for a long-lived superheavy nucleus with atomic mass number
  A=292 and atomic number Z=~122 in natural Th

abstract:
  Evidence for the existence of a superheavy nucleus with atomic mass number
A=292 and abundance (1-10)x10^(-12) relative to 232Th has been found in a study
of natural Th using inductively coupled plasma-sector field mass spectrometry.
The measured mass matches the predictions [1,2] for the mass of an isotope with
atomic number Z=122 or a nearby element. Its estimated half-life of t1/2 >=
10^8 y suggests that a long-lived isomeric state exists in this isotope. The
possibility that it might belong to a new class of long-lived high spin super-
and hyperdeformed isomeric states is discussed.[3-6]


title:
The first light-curve analysis of eclipsing binaries observed by the
  INTEGRAL/OMC

abstract:
  Three Algol-type binaries in Cygnus constellation were selected for an
analysis from a huge database of observations made by the INTEGRAL/OMC camera.
These data were processed and analyzed, resulting in a first light-curve study
of these neglected eclipsing binaries. The temperatures of the primary
components range from 9500 K to 10500 K and the inclinations are circa 73deg
(for PV Cyg and V1011 Cyg), while almost 90deg for V822 Cyg. All of them seem
to be main-sequence stars, well within their critical Roche lobes.
Nevertheless, further detailed analyses are still needed.


title: The eta' meson from lattice QCD

abstract:
  We study the flavour singlet pseudoscalar mesons from first principles using
lattice QCD. With N_f=2 flavours of light quark, this is the so-called eta_2
meson and we discuss the phenomenological status of this. Using maximally
twisted-mass lattice QCD, we extract the mass of the eta_2 meson at two values
of the lattice spacing for lighter quarks than previously discussed in the
literature. We are able to estimate the mass value in the limit of light quarks
with their physical masses.


title:
Delocalization effect of the Hubbard repulsion in exact terms and two
  dimensions

abstract:
  The genuine physical reasons explaining the delocalization effect of the
Hubbard repulsion U are analyzed. First it is shown that always when this
effect is observed, U acts on the background of a macroscopic degeneracy
present in a multiband type of system. After this step I demonstrate that
acting in such conditions, by strongly diminishing the double occupancy, U
spreads out the contributions in the ground state wave function, hence strongly
increases the one-particle localization length, consequently extends the
one-particle behavior producing conditions for a delocalization effect. To be
valuable, the reported results are presented in exact terms, being based on the
first exact ground states deduced at half filling in two dimensions for a
prototype two band system, the generic periodic Anderson model at finite value
of the interaction.


title:
Pattern Formation During Deformation of a Confined Viscoelastic Layer:
  From a Viscous Liquid to a Soft Elastic Solid

abstract:
  We study pattern formation during tensile deformation of confined
viscoelastic layers. The use of a model system (PDMS with different degrees of
crosslinking) allows us to go continuously from a viscous liquid to an elastic
solid. We observe two distinct regimes of fingering instabilities: a regime
called "elastic" with interfacial crack propagation where the fingering
wavelength only scales with the film thickness, and a bulk regime called
"viscoelastic" where the fingering instability shows a Saffman-Taylor-like
behavior. We find good quantitative agreement with theory in both cases and
present a reduced parameter describing the transition between the two regimes
and allowing to predict the observed patterns over the whole range of
viscoelastic properties.


title: Hardware In The Loop Simulator in UAV Rapid Development Life Cycle

abstract:
  Field trial is very critical and high risk in autonomous UAV development life
cycle. Hardware in the loop (HIL) simulation is a computer simulation that has
the ability to simulate UAV flight characteristic, sensor modeling and actuator
modeling while communicating in real time with the UAV autopilot hardware. HIL
simulation can be used to test the UAV autopilot hardware reliability, test the
closed loop performance of the overall system and tuning the control parameter.
By rigorous testing in the HIL simulator, the risk in the field trial can be
minimized.


title: Neutralinos and charginos in supersymmetric economical 3-3-1 model

abstract:
  Fermion superpartners - neutralinos and charginos in the supersymmetric
economical 3-3-1 model are studied. By imposition R parity, their masses and
eigenstates are derived.
  Assuming that Bino-like is dark matter, its mass density is calculated. The
cosmological dark matter density gives a bound on mass of LSP neutralino in the
range of 20 - 100 GeV, while the bound on mass of the lightest slepton is in
the range of 60 - 130 GeV


title: Local asymptotic normality for finite dimensional quantum systems

abstract:
  We extend our previous results on local asymptotic normality (LAN) for
qubits, to quantum systems of arbitrary finite dimension $d$. LAN means that
the quantum statistical model consisting of $n$ identically prepared
$d$-dimensional systems with joint state $\rho^{\otimes n}$ converges as
$n\to\infty$ to a statistical model consisting of classical and quantum
Gaussian variables with fixed and known covariance matrix, and unknown means
related to the parameters of the density matrix $\rho$. Remarkably, the limit
model splits into a product of a classical Gaussian with mean equal to the
diagonal parameters, and independent harmonic oscillators prepared in thermal
equilibrium states displaced by an amount proportional to the off-diagonal
elements.
  As in the qubits case, LAN is the main ingredient in devising a general two
step adaptive procedure for the optimal estimation of completely unknown
$d$-dimensional quantum states. This measurement strategy shall be described in
a forthcoming paper.


title:
Analytic approximate seismology of transversely oscillating coronal
  loops

abstract:
  We present an analytic approximate seismic inversion scheme for damped
transverse coronal loop oscillations based on the thin tube and thin boundary
approximation for computing the period and the damping time. Asymptotic
expressions for the period and damping rate are used to illustrate the process
of seismological inversion in a simple and easy to follow manner. The inversion
procedure is formulated in terms of two simple functions, which are given by
simple closed expressions. The analytic seismic inversion shows that an
infinite amount of 1-dimensional equilibrium models can reproduce the observed
periods and damping times. It predicts a specific range of allowable values for
the Alfven travel time and lower bounds for the density contrast and the
inhomogeneity length scale. When the results of the present analytic seismic
inversion are compared with those of a previous numerical inversion, excellent
agreement is found up to the point that the analytic seismic inversion emerges
as a tool for validating results of numerical inversions. Actually it helped us
to identify and correct inaccuracies in a previous numerical investigation.


title: The Hijazi inequality on conformally parabolic manifolds

abstract:
  We prove the Hijazi inequality, an estimate for Dirac eigenvalues, for
complete manifolds of finite volume. Under some additional assumptions on the
dimension and the scalar curvature, this inequality is also valid for elements
of the essential spectrum. This allows to prove the conformal version of the
Hijazi inequality on conformally parabolic manifolds if the spin analog to the
Yamabe invariant is positive.


title:
Effects of Leaders Position and Shape on Aerodynamic Performances of V
  Flight Formation

abstract:
  The influences of the leader in a group of V flight formation are dealt with.
The investigation is focused on the effect of its position and shape on
aerodynamics performances of a given V flight formation. Vortices generated the
wing tip of the leader moves downstream forming a pair of opposite rotating
line vortices. These vortices are generally undesirable because they create a
downwash that increases the induced drag on leaders wing. However, this
downwash is also accompanied by an upwash that can beneficial to the followers
wing flying behind the leaders one, namely a favorable lift for the followers
wing. How much contributions of the leaders wing to the followers wing in the V
formation flight is determined by the strength of tip vortices generated by the
leaders wing which is influenced by its position and shape including incidence
angle, dihedral angle, aspect ratio and taper ratio. The prediction of
aerodynamic performances of the V flight formation including lift, drag and
moment coefficients is numerically performed by solving Navier Stokes equations
with k e turbulence model. The computational domain is defined with multiblock
topology to capture the complex geometry arrangement of the V flight formation.


title:
Remark on the Boundedness of the Cauchy Singular Integral Operator on
  Variable Lebesgue Spaces with Radial Oscillating Weights

abstract:
  Recently V. Kokilashvili, N. Samko, and S. Samko have proved a sufficient
condition for the boundedness of the Cauchy singular integral operator on
variable Lebesgue spaces with radial oscillating weights over Carleson curves.
This condition is formulated in terms of Matuszewska-Orlicz indices of weights.
We prove a partial converse of their result.


title:
Automated Flight Test and System Identification for Rotary Wing Small
  Aerial Platform using Frequency Responses Analysis

abstract:
  This paper proposes an autopilot system that can be used to control the small
scale rotorcraft during the flight test for linear-frequency-domain system
identification. The input frequency swept is generated automatically as part of
the autopilot control command. Therefore the bandwidth coverage and consistency
of the frequency swept is guaranteed to produce high quality data for system
identification. Beside that we can set the safety parameter during the flight
test (maximum roll or pitch value, minimum altitude, etc) so the safety of the
whole flight test is guaranteed. This autopilot for automated flight test will
be tested using hardware in the loop simulator for hover flight condition.


title: Virtual Reality Simulation of Fire Fighting Robot Dynamic and Motion

abstract:
  This paper presents one approach in designing a Fire Fighting Robot which has
been contested annually in a robotic student competition in many countries
following the rules initiated at the Trinity College. The approach makes use of
computer simulation and animation in a virtual reality environment. In the
simulation, the amount of time, starting from home until the flame is
destroyed, can be confirmed. The efficacy of algorithms and parameter values
employed can be easily evaluated. Rather than spending time building the real
robot in a trial and error fashion, now students can explore more variation of
algorithm, parameter and sensor-actuator configuration in the early stage of
design. Besides providing additional excitement during learning process and
enhancing students understanding to the engineering aspects of the design, this
approach could become a useful tool to increase the chance of winning the
contest.


title:
Study of b-quark mass effects in multijet topologies with the DELPHI
  detector at LEP

abstract:
  The effect of the heavy b-quark mass on the two, three and four-jet rates is
studied using LEP data collected by the DELPHI experiment at the Z peak in 1994
and 1995. The rates of b-quark jets and light quark jets (l = uds) in events
with n = 2, 3, and 4 jets, together with the ratio of two and four-jet rates of
b-quarks with respect to light-quarks, R_n^bl, have been measured with a
double-tag technique using the CAMBRIDGE jet-clustering algorithm. A comparison
between experimental results and theory (matrix element or Monte Carlo event
generators such as PYTHIA, HERWIG and ARIADNE) is done after the hadronisation
phase. Using the four-jet observable R_4^bl, a measurement of the b-quark mass
using massive leading-order calculations gives: m_b(M_Z) = 3.76 +/- 0.32 (stat)
+/- 0.17 (syst) +/- 0.22 (had) +/- 0.90 (theo) GeV/c^2 . This result is
compatible with previous three-jet determinations at the M_Z energy scale and
with low energy mass measurements evolved to the M_Z scale using QCD
Renormalisation Group Equations.


title: A Bergman kernel proof of the Kawamata subadjunction theorem

abstract:
  The main purpose of the following article is to give a proof of Y. Kawamata's
celebrated subadjunction theorem in the spirit of our previous work on Bergman
kernels. We will use two main ingredients : an $\displaystyle L^{2\over
m}$--extension theorem of Ohsawa-Takegoshi type (which is also a new result)
and a more complete version of our former results.


title: Heading Lock Maneuver Testing of Autonomous Underwater Vehicle

abstract:
  In recent years, Autonomous Underwater Vehicle (UAV) research and development
at Bandung Institute of Technology in Indonesia has achieved the testing stage
in the field. This testing was still being classified as the early testing,
since some of the preliminary tests were carried out in the scale of the
laboratory. The paper would discuss the laboratory test and several tests that
were done in the field. Discussions were stressed in the procedure and the aim
that will be achieved, along with several early results. The testing was
carried out in the lake with the area around 8300 Ha and the maximum depth of
50 meters. The location of the testing was chosen with consideration of
minimizing the effect of the current and the wave, as well as the location that
was not too far from the Laboratory. The type of testing that will be discussed
in paper was Heading Lock Maneuver Testing. The vehicle was tested to move with
a certain cruising speed, afterwards it was commanded by an arbitrarily
selected heading direction. The response and the behavior of the vehicle were
recorded as the data produced by the testing.


title: Nuclear fusion in muonic molecules and in deuterated metals

abstract:
  Study of the fusion reactions between hydrogen isotopes in muonic molecules
is the first example of the accurate accounting of the nucleus charge screening
by a muon in the fusion process. At LUNA installation the measurements of
astrophysical reaction cross sections were extended down to collision energies
of a few keV. The screening by atomic electrons of the target became
substantial. The possibility to look over screening from unbound electrons is
given by metal-hydrides used as targets in dd reaction measurements. The
classical Debye screening in plasma, applied to quasi-free electrons in metal,
provides an explanation of unexpectedly large screening potentials found for
some metals in the research through the Periodic table of elements.


title: Formality of Cyclic Chains

abstract:
  We prove a conjecture raised by Tsygan, namely the existence of an
L-infinity-quasiisomorphism of L-infinity-modules between the cyclic chain
complex of smooth functions on a manifold and the differential forms on that
manifold. Concretely, we prove that the obvious u-linear extension of
Shoikhet's morphism of Hochschild chains solves Tsygan's conjecture.


title: Witt vectors. Part 1

abstract:
  This is the first part of a 2 part survey on the functor of the big and
p-adic Witt vectors.


title:
A characterization of quaternionic projective space by the
  conformal-Killing equation

abstract:
  We prove that a compact quaternionic-K\"{a}hler manifold of dimension $4n\geq
8$ admitting a conformal-Killing 2-form which is not Killing, is isomorphic to
the quaternionic projective space, with its standard quaternionic-K\"{a}hler
structure.


title:
The role of fluctuations in the response of coupled bistable units to
  weak driving time-periodic forces

abstract:
  We analyze the stochastic response of a finite set of globally coupled noisy
bistable units driven by rather weak time-periodic forces. We focus on the
stochastic resonance and phase frequency synchronization of the collective
variable, defined as the arithmetic mean of the variable characterizing each
element of the array. For single unit systems, stochastic resonance can be
understood with the powerful tools of linear response theory. Proper noise
induced phase frequency synchronization for a single unit system in this linear
response regime does not exist. For coupled arrays, our numerical simulations
indicate an enhancement of the stochastic resonance effects leading to gains
larger than unity as well as genuine phase frequency synchronization. The
non-monotonicity of the response with the strength of the coupling strength is
investigated. Comparison with simplifying schemes proposed in the literature to
describe the random response of the collective variable is carried out.


title: Development of Architectures for Internet Telerobotics Systems

abstract:
  This paper presents our experience in developing and implementing Internet
telerobotics system. Internet telerobotics system refers to a robot system
controlled and monitored remotely through the Internet. A robot manipulator
with five degrees of freedom, called Mentor, is employed. Client-server
architecture is chosen as a platform for our Internet telerobotics system.
Three generations of telerobotics systems have evolved in this research. The
first generation was based on CGI and two tiered architecture, where a client
presents a Graphical User Interface to the user, and utilizes the user's data
entry and actions to perform requests to robot server running on a different
machine. The second generation was developed using Java. We also employ Java 3D
for creating and manipulating 3D geometry of manipulator links and for
constructing the structures used in rendering that geometry, resulting in 3D
robot movement simulation presented to the users(clients) through their web
browser. Recent development in our Internet telerobotics includes object
recognition through image captured by a camera, which poses challenging
problem, given the undeterministic latency of the Internet. The third
generation is centered around the use of CORBA for development platform of
distributed internet telerobotics system, aimed at distributing task of
telerobotics system.


title: Gravitational collapse without a remnant

abstract:
  We investigate the gravitational collapse of a spherically symmetric,
inhomogeneous star, which is described by a perfect fluid with heat flow and
satisfies the equation of state $p=\rho/3$ or $p=C\rho^\ga$ at its center.
Different from the ordinary process of gravitational collapsing, the energy of
the whole star is emitted into space. And the remaining spacetime is a
Minkowski one at the end of the process.


title:
Approximate Controllability for Linear Stochastic Differential Equations
  in Infinite Dimensions

abstract:
  The objective of the paper is to investigate the approximate controllability
property of a linear stochastic control system with values in a separable real
Hilbert space. In a first step we prove the existence and uniqueness for the
solution of the dual linear backward stochastic differential equation. This
equation has the particularity that in addition to an unbounded operator acting
on the Y-component of the solution there is still another one acting on the
Z-component. With the help of this dual equation we then deduce the duality
between approximate controllability and observability. Finally, under the
assumption that the unbounded operator acting on the state process of the
forward equation is an infinitesimal generator of an exponentially stable
semigroup, we show that the generalized Hautus test provides a necessary
condition for the approximate controllability. The paper generalizes former
results by Buckdahn, Quincampoix and Tessitore (2006) and Goreac (2007) from
the finite dimensional to the infinite dimensional case.


title: Unmanned Aerial Vehicle Instrumentation for Rapid Aerial Photo System

abstract:
  This research will proposed a new kind of relatively low cost autonomous UAV
that will enable farmers to make just in time mosaics of aerial photo of their
crop. These mosaics of aerial photo should be able to be produced with
relatively low cost and within the 24 hours of acquisition constraint. The
autonomous UAV will be equipped with payload management system specifically
developed for rapid aerial mapping. As mentioned before turn around time is the
key factor, so accuracy is not the main focus (not orthorectified aerial
mapping). This system will also be equipped with special software to post
process the aerial photos to produce the mosaic aerial photo map


title: First Principle Approach to Modeling of Small Scale Helicopter

abstract:
  The establishment of global helicopter linear model is very precious and
useful for the design of the linear control laws, since it is never afforded in
the published literatures. In the first principle approach, the mathematical
model was developed using basic helicopter theory accounting for particular
characteristic of the miniature helicopter. No formal system identification
procedures are required for the proposed model structure. The relevant
published literatures however did not present the linear models required for
the design of linear control laws. The paper presents a step by step
development of linear model for small scale helicopter based on first-principle
approach. Beyond the previous work in literatures, the calculation of the
stability derivatives is presented in detail. A computer program is used to
solve the equilibrium conditions and then calculate the change in aerodynamics
forces and moments due to the change in each degree of freedom and control
input. The detail derivation allows the comprehensive analysis of relative
dominance of vehicle states and input variables to force and moment components.
Hence it facilitates the development of minimum complexity small scale
helicopter dynamics model.


title:
A novel background reduction strategy for high level triggers and
  processing in gamma-ray Cherenkov detectors

abstract:
  Gamma ray astronomy is now at the leading edge for studies related both to
fundamental physics and astrophysics. The sensitivity of gamma detectors is
limited by the huge amount of background, constituted by hadronic cosmic rays
(typically two to three orders of magnitude more than the signal) and by the
accidental background in the detectors. By using the information on the
temporal evolution of the Cherenkov light, the background can be reduced. We
will present here the results obtained within the MAGIC experiment using a new
technique for the reduction of the background. Particle showers produced by
gamma rays show a different temporal distribution with respect to showers
produced by hadrons; the background due to accidental counts shows no
dependence on time. Such novel strategy can increase the sensitivity of present
instruments.


title: Optimal Tracking Controller Design for a Small Scale Helicopter

abstract:
  A model helicopter is more difficult to control than its full scale
counterparts. This is due to its greater sensitivity to control inputs and
disturbances as well as higher bandwidth of dynamics. This works is focused on
designing practical tracking controller for a small scale helicopter following
predefined trajectories. A tracking controller based on optimal control theory
is synthesized as part of the development of an autonomous helicopter. Some
issues in regards to control constraints are addressed. The weighting between
state tracking performance and control power expenditure is analyzed. Overall
performance of the control design is evaluated based on its time domain
histories of trajectories as well as control inputs.


title:
Supersonic and subsonic flows in general relativistic radiation
  hydrodynamics

abstract:
  We analyze stationary accretion of selfgravitating gas onto a compact center
within general-relativistic radiation hydrodynamics. Spherical symmetry and
thin gas approximation are assumed. Numerical investigation shows that
transonic flows exist for small redshifts and they cease to exist for high
redshifts and high luminosities. There exist two branches of flows (subsonic or
supersonic) that originate at a bifurcation point and that embrace the set of
subsonic solutions. The morphology of the set of subsonic solutions is
essentially independent of redshifts and flows that belong to their boundary
provide estimates of the gas abundance of subsonic solutions. It appears that
prescribed boundary data guarantee uniqueness only of the bifurcation point,
and that the latter has maximal luminosity.


title: Neutrino Interactions

abstract:
  This manuscript summarizes a series of three lectures on interactions of
neutrinos . The lectures begin with a pedagogical foundation and then explore
topics of interest to current and future neutrino oscillation and cross-section
experiments.


title: Insurance, Reinsurance and Dividend Payment

abstract:
  The aim of this paper is to introduce an insurance model allowing reinsurance
and dividend payment. Our model deals with several homogeneous contracts and
takes into account the legislation regarding the provisions to be justified by
the insurance companies. This translates into some restriction on the (maximal)
number of contracts the company is allowed to cover. We deal with a controlled
jump process in which one has free choice of retention level and dividend
amount. The value function is given as the maximized expected discounted
dividends. We prove that this value function is a viscosity solution of some
first-order Hamilton-Jacobi-Bellman variational inequality. Moreover, a
uniqueness result is provided.


title: Smooth conjugacy of Anosov diffeomorphisms on higher dimensional tori

abstract:
  Let $L$ be a hyperbolic automorphism of $\mathbb T^d$, $d\ge3$. We study the
smooth conjugacy problem in a small $C^1$-neighborhood $\mathcal U$ of $L$.
  The main result establishes $C^{1+\nu}$ regularity of the conjugacy between
two Anosov systems with the same periodic eigenvalue data. We assume that these
systems are $C^1$-close to an irreducible linear hyperbolic automorphism $L$
with simple real spectrum and that they satisfy a natural transitivity
assumption on certain intermediate foliations.
  We elaborate on the example of de la Llave of two Anosov systems on $\mathbb
T^4$ with the same constant periodic eigenvalue data that are only H\"older
conjugate. We show that these examples exhaust all possible ways to perturb
$C^{1+\nu}$ conjugacy class without changing periodic eigenvalue data. Also we
generalize these examples to majority of reducible toral automorphisms as well
as to certain product diffeomorphisms of $\mathbb T^4$ $C^1$-close to the
original example.


title:
Minimum-energy broadcast in random-grid ad-hoc networks: approximation
  and distributed algorithms

abstract:
  The Min Energy broadcast problem consists in assigning transmission ranges to
the nodes of an ad-hoc network in order to guarantee a directed spanning tree
from a given source node and, at the same time, to minimize the energy
consumption (i.e. the energy cost) yielded by the range assignment. Min energy
broadcast is known to be NP-hard.
  We consider random-grid networks where nodes are chosen independently at
random from the $n$ points of a $\sqrt n \times \sqrt n$ square grid in the
plane. The probability of the existence of a node at a given point of the grid
does depend on that point, that is, the probability distribution can be
non-uniform.
  By using information-theoretic arguments, we prove a lower bound
$(1-\epsilon) \frac n{\pi}$ on the energy cost of any feasible solution for
this problem. Then, we provide an efficient solution of energy cost not larger
than $1.1204 \frac n{\pi}$.
  Finally, we present a fully-distributed protocol that constructs a broadcast
range assignment of energy cost not larger than $8n$,thus still yielding
constant approximation. The energy load is well balanced and, at the same time,
the work complexity (i.e. the energy due to all message transmissions of the
protocol) is asymptotically optimal. The completion time of the protocol is
only an $O(\log n)$ factor slower than the optimum. The approximation quality
of our distributed solution is also experimentally evaluated.
  All bounds hold with probability at least $1-1/n^{\Theta(1)}$.


title:
Solutions in folded geometries, and associated cloaking due to anomalous
  resonance

abstract:
  Solutions for the fields in a coated cylinder where the core radius is bigger
than the shell radius are seemingly unphysical, but can be given a physical
meaning if one transforms to an equivalent problem by unfolding the geometry.
In particular the unfolded material can act as an impedance matched hyperlens,
and as the loss in the lens goes to zero finite collections of polarizable line
dipoles lying within a critical region surrounding the hyperlens are shown to
be cloaked having vanishingly small dipole moments. This cloaking, which occurs
both in the folded geometry and the equivalent unfolded one, is due to
anomalous resonance, where the collection of dipoles generates an anomalously
resonant field, which acts back on the dipoles to essentially cancel the
external fields acting on them.


title:
Hydrostatic equilibrium of causally consistent and dynamically stable
  neutron star models

abstract:
  We show that the mass-radius $(M-R)$ relation corresponding to the stiffest
equation of state (EOS) does not provide the necessary and sufficient condition
of dynamical stability for the equilibrium configurations, since such
configurations can not satisfy the `compatibility criterion'. In this
connection, we construct sequences composed of core-envelope models such that,
like the stiffest EOS, each member of these sequences satisfy the extreme case
of causality condition, $v = c = 1$, at the centre. We, thereafter, show that
the $M-R$ relation corresponding to the said core-envelope model sequences can
provide the necessary and sufficient condition of dynamical stability only when
the `compatibility criterion' for these sequences is `appropriately' satisfied.
However, the fulfillment of `compatibility criterion' can remain satisfied even
when the $M-R$ relation does not provide the necessary and sufficient condition
of dynamical stability for the equilibrium configurations.
  In continuation to the results of previous study, these results explicitly
show that the `compatibility criterion' {\em independently} provides, in
general, the {\em necessary} and {\em sufficient} condition of hydrostatic
equilibrium for any regular sequence. Beside its fundamental feature, this
study can also explain simultaneously, both (the higher as well as lower)
values of the glitch healing parameter observed for the Crab and the Vela-like
pulsars respectively, on the basis of starquake model of glitch generation.


title: Covalency effects on the magnetism of EuRh2P2

abstract:
  In experiments, the ternary Eu pnictide EuRh2P2 shows an unusual coexistence
of a non-integral Eu valence of about 2.2 and a rather high Neel temperature of
50 K. In this paper, we present a model which explains the non-integral Eu
valence via covalent bonding of the Eu 4f-orbitals to P2 molecular orbitals. In
contrast to intermediate valence models where the hybridization with
delocalized conduction band electrons is known to suppress magnetic ordering
temperatures to at most a few Kelvin, covalent hybridization to the localized
P2 orbitals avoids this suppression. Using perturbation theory we calculate the
valence, the high temperature susceptibility, the Eu single-ion anisotropy and
the superexchange couplings of nearest and next-nearest neighbouring Eu ions.
The model predicts a tetragonal anisotropy of the Curie constants. We suggest
an experimental investigation of this anisotropy using single crystals. From
experimental values of the valence and the two Curie constants, the three free
parameters of our model can be determined.


title: Fractional oscillator process with two indices

abstract:
  We introduce a new fractional oscillator process which can be obtained as
solution of a stochastic differential equation with two fractional orders.
Basic properties such as fractal dimension and short range dependence of the
process are studied by considering the asymptotic properties of its covariance
function. The fluctuation--dissipation relation of the process is investigated.
The fractional oscillator process can be regarded as one-dimensional fractional
Euclidean Klein-Gordon field, which can be obtained by applying the Parisi-Wu
stochastic quantization method to a nonlocal Euclidean action. The Casimir
energy associated with the fractional field at positive temperature is
calculated by using the zeta function regularization technique.


title: Local Strain Relaxation Dictates Polymer Melt Viscosity

abstract: This paper has been withdrawn due to conflicts with journal copyright issues.


title:
Search for the Rare Decays B^+ -> mu^+ mu^- K^+, B^0 -> mu^+ mu^-
  K^*0(892), and B^0_s -> mu^+ mu^- phi at CDF

abstract:
  We search for b to s\mu^+\mu^- transitions in B meson (B^+, B^0, or B^0_s)
decays with 924pb^{-1} of p pbar collisions at sqrt(s)=1.96 TeV collected with
the CDF II detector at the Fermilab Tevatron. We find excesses with
significances of 4.5, 2.9, and 2.4 standard deviations in the B^+ to
\mu^+\mu^-K^+, B^0 to \mu^+\mu^-K^*(892)^0, and B_s^0 to \mu^+\mu^-\phi decay
modes, respectively. Using B to J/psi h (h = K^+, K^*(892)^0, phi) decays as
normalization channels, we report branching fractions for the previously
observed B^+ and B^0 decays, BR(B^+ to \mu^+\mu^-K^+)=(0.59\pm0.15\pm0.04) x
10^{-6}, and BR(B^0 to \mu^+\mu^-K^*(892)^0)=(0.81\pm0.30\pm0.10) x 10^{-6},
where the first uncertainty is statistical, and the second is systematic. These
measurements are consistent with the world average results, and are competitive
with the best available measurements. We set an upper limit on the relative
branching fraction BR(B_s^0 to \mu^+\mu^-\phi)/BR(B_s^0 to J/\psi\phi)
<2.6(2.3)\times10^{-3} at the 95(90)% confidence level, which is the most
stringent to date.


title: Nonlinear hysteretic behavior of a confined sliding layer

abstract:
  A nonlinear model representing the tribological problem of a thin solid
lubricant layer between two sliding periodic surfaces is used to analyze the
phenomenon of hysteresis at pinning/depinning around a moving state rather than
around a statically pinned state. The cycling of an external driving force
F_ext is used as a simple means to destroy and then to recover the dynamically
pinned state previously discovered for the lubricant center-of-mass velocity.
De-pinning to a quasi-freely sliding state occurs either directly, with a
single jump, or through a sequence of discontinuous transitions. The
intermediate sliding steps are reminiscent of phase-locked states and
stick-slip motion in static friction, and can be interpreted in terms of the
appearance of travelling density defects in an otherwise regular arrangement of
kinks. Re-pinning occurs more smoothly, through the successive disappearance of
different travelling defects. The resulting bistability and multistability
regions may also be explored by varying mechanical parameters other than F_ext,
e.g. the sliding velocity or the corrugation amplitude of the sliders.


title:
Topological symmetry breaking of self--interacting fractional
  Klein--Gordon field on toroidal spacetime

abstract:
  Quartic self--interacting fractional Klein--Gordon scalar massive and
massless field theories on toroidal spacetime are studied. The effective
potential and topologically generated mass are determined using zeta function
regularization technique. Renormalization of these quantities are derived.
Conditions for symmetry breaking are obtained analytically. Simulations are
carried out to illustrate regions or values of compactified dimensions where
symmetry breaking mechanisms appear.


title: Model for the unidirectional motion of a dynein molecule

abstract:
  Cytoplasmic dyneins transport cellular organelles by moving on a microtubule
filament. It has been found recently that depending on the applied force and
the concentration of the adenosine triphosphate (ATP) molecules, dynein's step
size varies. Based on these studies, we propose a simple model for dynein's
unidirectional motion taking into account the variations in its step size. We
study how the average velocity and the relative dispersion in the displacement
vary with the applied load. The model is amenable to further extensions by
inclusion of details associated with the structure and the processivity of the
molecule.


title:
Clustering and coalescence from multiplicative noise: the Kraichnan
  ensemble

abstract:
  We study the dynamics of the two-point statistics of the Kraichnan ensemble
which describes the transport of a passive pollutant by a stochastic turbulent
flow characterized by scale invariant structure functions. The fundamental
equation of this problem consists in the Fokker-Planck equation for the
two-point correlation function of the density of particles performing spatially
correlated Brownian motions with scale invariant correlations. This problem is
equivalent to the stochastic motion of an effective particle driven by a
generic multiplicative noise. In this paper we propose an alternative and more
intuitive approach to the problem than the original one leading to the same
conclusions. The general features of this new approach make possible to fit it
to other more complex contexts.


title: Gaugino Condensation with a Doubly Suppressed Gravitino Mass

abstract:
  Supersymmetry breakdown via gaugino condensation in heterotic string theory
can lead to models with a doubly suppressed gravitino mass. A TeV scale
gravitino can emerge from a condensate as large as the grand unified scale. We
analyze the properties of these models and discuss applications for particle
physics and cosmology.


title:
Reasoning in Abella about Structural Operational Semantics
  Specifications

abstract:
  The approach to reasoning about structural operational semantics style
specifications supported by the Abella system is discussed. This approach uses
lambda tree syntax to treat object language binding and encodes binding related
properties in generic judgments. Further, object language specifications are
embedded directly into the reasoning framework through recursive definitions.
The treatment of binding via generic judgments implicitly enforces distinctness
and atomicity in the names used for bound variables. These properties must,
however, be made explicit in reasoning tasks. This objective can be achieved by
allowing recursive definitions to also specify generic properties of atomic
predicates. The utility of these various logical features in the Abella system
is demonstrated through actual reasoning tasks. Brief comparisons with a few
other logic based approaches are also made.


title:
Finite Temperature Casimir Effect for a Massless Fractional Klein-Gordon
  field with Fractional Neumann Conditions

abstract:
  This paper studies the Casimir effect due to fractional massless Klein-Gordon
field confined to parallel plates. A new kind of boundary condition called
fractional Neumann condition which involves vanishing fractional derivatives of
the field is introduced. The fractional Neumann condition allows the
interpolation of Dirichlet and Neumann conditions imposed on the two plates.
There exists a transition value in the difference between the orders of the
fractional Neumann conditions for which the Casimir force changes from
attractive to repulsive. Low and high temperature limits of Casimir energy and
pressure are obtained. For sufficiently high temperature, these quantities are
dominated by terms independent of the boundary conditions. Finally, validity of
the temperature inversion symmetry for various boundary conditions is
discussed.


title:
Finite temperature Casimir energy in closed rectangular cavities: a
  rigorous derivation based on zeta function technique

abstract:
  We derive rigorously explicit formulas of the Casimir free energy at finite
temperature for massless scalar field and electromagnetic field confined in a
closed rectangular cavity with different boundary conditions by zeta
regularization method. We study both the low and high temperature expansions of
the free energy. In each case, we write the free energy as a sum of a
polynomial in temperature plus exponentially decay terms. We show that the free
energy is always a decreasing function of temperature. In the cases of massless
scalar field with Dirichlet boundary condition and electromagnetic field, the
zero temperature Casimir free energy might be positive. In each of these cases,
there is a unique transition temperature (as a function of the side lengths of
the cavity) where the Casimir energy change from positive to negative. When the
space dimension is equal to two and three, we show graphically the dependence
of this transition temperature on the side lengths of the cavity. Finally we
also show that we can obtain the results for a non-closed rectangular cavity by
letting the size of some directions of a closed cavity going to infinity, and
we find that these results agree with the usual integration prescription
adopted by other authors.


title:
Threshold production of meta-stable bound states of Kaluza Klein
  excitations in Universal Extra Dimensions

abstract:
  We study the formation and detection at the next linear e^+e^- collider of
bound states of level-1 quark Kaluza-Klein excitations B_KK within a scenario
of universal extra-dimensions (UED). The interactions of such Kaluza-Klein
excitations are modeled by an alpha_s driven Coulomb potential. In order to
obtain the threshold cross-section, we employ the Green function method which
is known to properly describe the peaks below threshold and to yield a net
increase in the continuum region (above threshold) relative to the naive Born
cross-section. We study such effect at different values of the scale (R^-1) of
the extra-dimensions with an explicit calculation of the mass spectrum as given
by radiative corrections. The overall effect is roughly 2.7 at R^-1=300 GeV and
goes down to 2.2 at R^-1=1000 GeV and a relatively large number of events is
expected from N_events ~ 2.5*10^4 at R^-1=300 GeV down to N_events ~ 10^3 at
R^-1=1000 GeV at the anticipated annual integrated luminosity of L_0= 100
fb^-1. We finally discuss some potentially observable signatures such as the
multilepton channels 2j + 2l + missing energy, and 2j + 4l + missing energy for
which we estimate statistical significance >~ 2 for R^-1 up to 600 ~ 700 GeV.


title:
Theory of inelastic lifetimes of surface-state electrons and holes at
  metal surfaces

abstract:
  After the early suggestion by John Pendry to probe unoccupied bands at
surfaces through the time reversal of the photoemission process, the
inverse-photoemission technique yielded the first conclusive experimental
evidence for the existence of image-potential bound states at metal surfaces
and has led over the last two decades to an active area of research in
condensed-matter and surface physics. Here we describe the current status of
the many-body theory of inelastic lifetimes of these image-potential states and
also the Shockley surface states that exist near the Fermi level in the
projected bulk band gap of simple and noble metals. New calculations of the
self-energy and lifetime of surface states on Au surfaces are presented as
well, by using the $GW\Gamma$ approximation of many-body theory.


title: Resonance oscillations of magnetoresistance in double quantum wells

abstract:
  We present experimental and theoretical studies of the magnetoresistance
oscillations induced by resonance transitions of electrons between
tunnel-coupled states in double quantum wells. The suppression of these
oscillations with increasing temperature is irrelevant to the thermal
broadening of the Fermi distribution and reflects the temperature dependence of
the quantum lifetime of electrons. The gate control of the period and amplitude
of the oscillations is demonstrated.


title:
CMC tori of revolution in $\mathbb{S}^3$: additional data on the spectra
  of their Jacobi operators

abstract:
  We prove a theorem about elliptic operators with symmetric potential
functions, defined on a function space over a closed loop. The result is
similar to a known result for a function space on an interval with Dirichlet
boundary conditions. These theorems provide accurate numerical methods for
finding the spectra of those operators over either type of function space. As
an application, we numerically compute the Morse index of constant mean
curvature tori of revolution in the unit 3-sphere $\mathbb{S}^3$, confirming
that every such torus has Morse index at least five, and showing that other
known lower bounds for this Morse index are close to optimal.


title:
Overspinning a nearly extreme black hole and the Weak Cosmic Censorship
  conjecture

abstract:
  We revisit here the recent proposal for overspinning a nearly extreme black
hole by means of a quantum tunneling process. We show that electrically neutral
massless fermions evade possible back reactions effects related to
superradiance, confirming the view that it would be indeed possible to form a
naked singularity due to quantum effects.


title:
Comment on Resummation of Mass Distribution for Jets Initiated by
  Massive Quarks

abstract:
  We compute in the heavy quark effective theory the soft coefficient D_2
entering the resummation of next-to-next-to-leading threshold logarithms for
jets initiated by a quark with a small mass compared to the hard scale of the
process. We find complete agreement with a previous computation in full QCD.
Contrary to our previous guess, this coefficient turns out to be different from
that one entering heavy flavor decay or heavy flavor fragmentation.


title:
The Influence of A-site Ionic Radii on the Magnetic Structure of Charge
  Ordered La0.5Ca0.5-xSrxMnO3 Manganites

abstract:
  The influence of the A-site ionic radii (<rA>) on the magnetic structure has
been investigated in La0.5Ca0.5-xSrxMnO3 compounds (0 .GE. x .LE. 0.5) using
neutron diffraction, magnetization, and resistivity techniques. All compounds
in the composition range x .LE. 0.3 crystallize in the orthorhombic structure
(Space Group Pnma). No further structural transition is observed as temperature
is lowered below 300K. The compound x = 0.4, is a mixture of two orthorhombic
phases crystallizing in Pnma and Fmmm space group. The x = 0.5 compound has a
tetragonal structure in the space group, I4/mcm. The charge ordered (CO) state
with CE-type antiferromagnetic order remains stable for x .LE. 0.3. Above x =
0.3, the CE-type antiferromagnetic state is suppressed. In x = 0.4 compound,
A-type antiferromagnetic ordering is found at temperatures below 200K. Orbital
ordering accompanying the spin ordering is found in all the samples with x .LE.
0.4. The system becomes ferromagnetic at x = 0.5 and no signature of orbital
ordering is observed. As a function of <rA>, the charge ordered state is stable
up to <rA> ~ 1.24A, and is suppressed thereafter. The magnetic structure
undergoes a transformation from CE-type antiferromagnetic state to a
ferromagnetic state with an intermediate A-type antiferromagnetic state.


title:
Ab initio simulation of photoemission spectroscopy in solids: Plane-wave
  pseudopotential approach, with applications to normal-emission spectra of
  Cu(001) and Cu(111)

abstract:
  We introduce a new method for simulating photoemission spectra from bulk
crystals in the ultra-violet energy range, within a three-step model. Our
method explicitly accounts for transmission and matrix-element effects, as
calculated from state-of-the-art plane-wave pseudopotential techniques within
density-functional theory. Transmission effects, in particular, are included by
extending to the present problem a technique previously employed with success
to deal with ballistic conductance in metal nanowires. The spectra calculated
for normal emission in Cu(001) and Cu(111) are in fair agreement with previous
theoretical results and with experiments, including a newly determined
spectrum. The residual discrepancies between our results and the latter are
mainly due to the well-known deficiencies of density-functional theory in
accounting for correlation effects in quasi-particle spectra. A significant
improvement is obtained by the LDA+U method. Further improvements are obtained
by including surface-optics corrections, as described by Snell's law and
Fresnel's equations.


title:
The see-saw mechanism: neutrino mixing, leptogenesis and lepton flavor
  violation

abstract:
  The see-saw mechanism to generate small neutrino masses is reviewed. After
summarizing our current knowledge about the low energy neutrino mass matrix we
consider reconstructing the see-saw mechanism. Low energy neutrino physics is
not sufficient to reconstruct see-saw, a feature which we refer to as ``see-saw
degeneracy''. Indirect tests of see-saw are leptogenesis and lepton flavor
violation in supersymmetric scenarios, which together with neutrino mass and
mixing define the framework of see-saw phenomenology. Several examples are
given, both phenomenological and GUT-related. Variants of the see-saw mechanism
like the type II or triplet see-saw are also discussed. In particular, we
compare many general aspects regarding the dependence of LFV on low energy
neutrino parameters in the extreme cases of a dominating conventional see-saw
term or a dominating triplet term. For instance, the absence of mu -> e gamma
or tau -> e gamma in the pure triplet case means that CP is conserved in
neutrino oscillations. Scanning models, we also find that among the decays mu
-> e gamma, tau -> e gamma and tau -> mu gamma the latter one has the largest
branching ratio in (i) SO(10) type I see-saw models and in (ii) scenarios in
which the triplet term dominates in the neutrino mass matrix.


title:
Maximum Probability and Relative Entropy Maximization. Bayesian Maximum
  Probability and Empirical Likelihood

abstract:
  Works, briefly surveyed here, are concerned with two basic methods: Maximum
Probability and Bayesian Maximum Probability; as well as with their asymptotic
instances: Relative Entropy Maximization and Maximum Non-parametric Likelihood.
Parametric and empirical extensions of the latter methods - Empirical Maximum
Maximum Entropy and Empirical Likelihood - are also mentioned. The methods are
viewed as tools for solving certain ill-posed inverse problems, called
Pi-problem, Phi-problem, respectively. Within the two classes of problems,
probabilistic justification and interpretation of the respective methods are
discussed.


title: Radio Emission from Exoplanets

abstract:
  We present results from new low frequency observations of two extrasolar
planetary systems (Epsilon Eridani and HD128311) taken at 150 MHz with the
Giant Metrewave Radio Telescope (GMRT). We do not detect either system, but are
able to place tight upper limits on their low frequency radio emission.


title: On the global boundedness of Fourier integral operators

abstract:
  We consider a class of Fourier integral operators, globally defined on
$\mathbb{R}^{d}$, with symbols and phases satisfying product type estimates
(the so-called $SG$ or scattering classes). We prove a sharp continuity result
for such operators when acting on the modulation spaces $M^p$. The minimal loss
of derivatives is shown to be $d|1/2-1/p|$. This global perspective produces a
loss of decay as well, given by the same order. Strictly related, striking
examples of unboundedness on $L^p$ spaces are presented.


title: Polyakov loops and spectral properties of the staggered Dirac operator

abstract:
  We study the spectrum of the staggered Dirac operator in SU(2) gauge fields
close to the free limit, for both the fundamental and the adjoint
representation. Numerically we find a characteristic cluster structure with
spacings of adjacent levels separating into three scales. We derive an
analytical formula which explains the emergence of these different spectral
scales. The behavior on the two coarser scales is determined by the lattice
geometry and the Polyakov loops, respectively. Furthermore, we analyze the
spectral statistics on all three scales, comparing to predictions from random
matrix theory.


title: The role of the charge state of PAHs in ultraviolet extinction

abstract:
  Aims: We explore the relation between charge state of polycyclic aromatic
hydrocarbons (PAHs) and extinction curve morphology. Methods: We fit extinction
curves with a dust model including core-mantle spherical particles of mixed
chemical composition (silicate core, $sp^2$ and $sp^3$ carbonaceous layers),
and an additional molecular component. We use exact methods to calculate the
extinction due to classical particles and accurate computed absorption spectra
of PAHs in different charge states, for the contribution due to the molecular
component, along a sample of five rather different lines of sight. Results: A
combination of classical dust particles and mixtures of real PAHs
satisfactorily matches the observed interstellar extinction curves. Variations
of the spectral properties of PAHs in different charge states produce changes
consistent with the varying relative strengths of the bump and non-linear
far-UV rise.


title:
A comment on discrete Kalb-Ramond field on orientifold and rank
  reduction

abstract:
  We show that the rank reduction of the gauge group on orientifolds in
presence of non vanishing discrete Kalb-Ramond field can be explained by the
presence of an induced field strength in a non trivial bundle on the branes.
This field strength is also necessary for the tadpole cancellation and the
number of branes is left unchanged by the presence of the discrete Kalb-Ramond
background.


title: Considerations for Anderson-Bridge Experiment

abstract:
  Various issues concerned with the design and sensitivity of the Anderson
bridge are discussed. We analyse the circuit using the tools of Network
Analysis to determine the conditions under which the balance may be obtained
with greater sensitivity and discuss how to obtain these under practical
circumstances in an undergraduate laboratory.


title: Radiative B-L symmetry breaking and the Z' mediated SUSY breaking

abstract:
  We explore a mechanism of radiative B-L symmetry breaking in analogous to the
radiative electroweak symmetry breaking. The breaking scale of B-L symmetry is
related to the neutrino masses through the see-saw mechanism. Once we
incorporate the U(1)_{B-L} gauge symmetry in SUSY models, the U(1)_{B-L}
gaugino appears, and it can mediate the SUSY breaking (Z-prime mediated SUSY
breaking) at around the scale of 10^6 GeV. Then we find a links between the
neutrino mass (more precisly the see-saw or B-L scale of order 10^{6} GeV) and
the Z-prime mediated SUSY breaking scale. It is also very interesting that the
gluino at the weak scale becomes relatively light, and almost compressed mass
spectra for the gaugino sector can be realized in this scenario, which is very
interesting in scope of the LHC.


title:
Propagation of Electron Magnetohydrodynamic structures in a 2-D
  inhomogeneous plasma

abstract:
  The fully three dimensional governing equations in the electron
magnetohydrodynamic (EMHD) regime for a plasma with inhomogeneous density is
obtained. These equations in the two dimensional (2-D) limit can be cast in
terms of the evolution of two coupled scalar fields. The nonlinear simulations
for the two dimensional case are carried out to understand the propagation of
EMHD magnetic structures in the presence of inhomogeneity. A novel effect
related to trapping of dipolar magnetic structures in the high density plasma
region in the EMHD regime is observed. The interpretation of this phenomena as
well as its relevance to the problem of hot spot generation in the context of
fast ignition is presented.


title: The M/M/1 queue is Bernoulli

abstract:
  The classical output theorem for the M/M/1 queue, due to Burke (1956), states
that the departure process from a stationary M/M/1 queue, in equilibrium, has
the same law as the arrivals process, that is, it is a Poisson process. In this
paper we show that the associated measure-preserving transformation is
metrically isomorphic to a two-sided Bernoulli shift. We also discuss some
extensions of Burke's theorem where it remains an open problem to determine if,
or under what conditions, the analogue of this result holds.


title: Highly Degenerate Harmonic Mean Curvature Flow

abstract:
  We study the evolution of a weakly convex surface $\Sigma_0$ in $\R^3$ with
flat sides by the Harmonic Mean Curvature flow. We establish the short time
existence as well as the optimal regularity of the surface and we show that the
boundaries of the flat sides evolve by the curve shortening flow. It follows
from our results that a weakly convex surface with flat sides of class
$C^{k,\gamma}$, for some $k\in \mathbb{N}$ and $0 < \gamma \leq 1$, remains in
the same class under the flow. This distinguishes this flow from other,
previously studied, degenerate parabolic equations, including the porous medium
equation and the Gauss curvature flow with flat sides, where the regularity of
the solution for $t >0$ does not depend on the regularity of the initial data.


title: Magnetic states at the Oxygen surfaces of ZnO and Co-doped ZnO

abstract:
  First principles calculations of the O surfaces of Co-ZnO show that
substitutional Co ions develop large magnetic moments which long-range coupling
depends on their mutual distance. The local spin polarization induced at the O
atoms is three times larger at the surface than in the bulk, and the surface
stability is considerably reinforced by Co. Moreover, a robust ferromagnetic
state is predicted at the Oxygen (0001) surface even in the absence of magnetic
atoms. The occurrence of surface magnetic moments correlates with the number of
{\it p}-holes in the valence band of the oxide, and the distribution of the
magnetic charge is, even in the absence of spin-orbit interaction, highly
anisotropic.


title: Quantum Gross Laplacian and Applications

abstract:
  In this paper, we introduce and study a noncommutative extension of the Gross
Laplacian, called quantum Gross Laplacian. Then, applying the quantum Gross
Laplacian to the particular case where the operator is the multiplication
operator, we find a relation between classical and quantum Gross Laplacian. As
application, we give explicit solution of linear quantum white noise
differential equation. In particular, we give a explicit solution of the
quantum Gross heat equation.


title:
Microreversible recycled chemical systems. Comment on "A Re-Examination
  of Reversibility in Reaction Models for the Spontaneous Emergence of
  Homochirality"

abstract:
  The question of the onset of the homochirality on prebiotic Earth still
remains a fundamental question in the quest for the origin of life. Recent
works in this field introduce the concept of recycling, rather than the
traditional open-flow system described by Frank. This approach has been
criticized by Blackmond et al. They claimed that such systems are
thermodynamically impossible, except in the cases where non-microreversible
reactions are introduced, like in photochemical reactions, or under the
influence of physical actions (e.g. by crystal crushing). This point of view
reveals misunderstandings about this model of a recycled system, overlooks the
possibility of energy exchanges that could take place in prebiotic systems, and
leads the authors to unawarely remove the activation reaction and energy source
from their "non-equilibrium" models. It is especially important to understand
what are the concepts behind the notion of recycled systems, and of activation
reactions. These points are fundamental to comprehending how chemical systems
-- and especially prebiotic chemical systems -- can be maintained in
non-equilibrium steady states, and how free energy can be used and exchanged
between systems. The proposed approach aims at the decomposition of the
problem, avoiding to embrace the whole system at the same time.


title: GdI_2: A New Ferromagnetic Excitonic Solid?

abstract:
  The two-dimensional, colossal magnetoresistive system GdI_2 develops an
unusual metallic state below its ferromagnetic transition and becomes
insulating at low temperatures. It is argued that this geometrically
frustrated, correlated poor metal is a possible candidate for a ferromagnetic
excitonic liquid. The renormalized Fermi surface supports a further breaking of
symmetry to a charge ordered, excitonic solid ground state at lower
temperatures via order by disorder mechanism. Several experimental predictions
are made to investigate this unique orbitally correlated ground state.


title: RS model with a small curvature and two-photon production at the LHC

abstract:
  The p_trans-distribution for the diphoton production at the LHC is calculated
in the modified Randall-Sundrum model with a small curvature of the space-time
kappa, and 5-dimensional Planck scale M_5 in the TeV region. The discovery
limits on M_5 are obtained to be 9.4 TeV and 11.6 TeV for the integrated
luminosities 30 fb^(-1) and 100 fb^(-1), respectively. These limits do not
depend on kappa provided it is much smaller than M_5. The account of graviton
widths is a crucial points of our calculations.


title: Graphene-protected iron layer on Ni(111)

abstract:
  Here we report the photoemission studies of intercalation process of Fe
underneath graphene layer on Ni(111). The process of intercalation was
monitored via XPS of corresponding core levels and UPS of the graphene-derived
$\pi$ states in the valence band. \textit{fcc}-Fe films with thickness of 2-5
monolayers at the interface between graphene and Ni(111) form epitaxial
magnetic layer passivated from the reactive environment, like for example
oxygen gas.


title: The noisy veto-voter model: a Recursive Distributional Equation on [0,1]

abstract:
  We study a particular example of a recursive distributional equation (RDE) on
the unit interval. We identify all invariant distributions, the corresponding
"basins of attraction" and address the issue of endogeny for the associated
tree-indexed problem, making use of an extension of a recent result of Warren.


title:
Some properties of evolving wormhole geometries within nonlinear
  electrodynamics

abstract:
  In this paper we review some properties for the evolving wormhole solution of
Einstein equations coupled with nonlinear electrodynamics. We integrate the
geodesic equations in the effective geometry obeyed by photons; we check out
the weak field limit and find the traversability conditions. Then we analyze
the case when the lagrangian depends on two electromagnetic invariants and it
turns out that there is not a more general solution within the assumed
geometry.


title: Dynamic origin of species

abstract:
  A simple model of species origin resulted from dynamic features of a
population, solely, is developed. The model is based on the evolution
optimality in space distribution, and the selection is gone over the mobility.
Some biological issues are discussed.


title: The serendipituous discovery of a short-period eclipsing polar in 2XMMp

abstract:
  We report the serendipituous discovery of the new eclipsing polar 2XMMp
J131223.4+173659. Its striking X-ray light curve attracted immediate interest
when we were visually inspecting the source products of the 2XMMp catalogue.
This light curve revealed its likely nature as a magnetic cataclysmic variable
of AM Herculis (or polar) type with an orbital period of ~92 min, which was
confirmed by follow-up optical spectroscopy and photometry. 2XMMp
J131223.4+173659 probably has a one-pole accretion geometry. It joins the group
of now nine objects that show no evidence of a soft component in their X-ray
spectra despite being in a high accretion state, thus escaping ROSAT/EUVE
detection. We discuss the likely accretion scenario, the system parameters, and
the spectral energy distribution.


title: Time Dependent Contraction Hierarchies -- Basic Algorithmic Ideas

abstract:
  Contraction hierarchies are a simple hierarchical routing technique that has
proved extremely efficient for static road networks. We explain how to
generalize them to networks with time-dependent edge weights. This is the first
hierarchical speedup technique for time-dependent routing that allows
bidirectional query algorithms.


title: Remarks on BMV conjecture

abstract:
  We show that for fixed $A,B$, hermitian nonnegative definite matrices, and
fixed $k$ the coefficients of the $t^k$ in the polynomial $\tr (A+tB)^m$ is
positive if $\tr AB >0$ and $m>N(A,B,k)$.


title: How Universal is the Coupling in the Sigma Model?

abstract:
  We calculate pion-pion scattering lengths and sigma, rho and a1 decay widths
from a gauged linear sigma model with two flavours and its globally invariant
generalisation.


title:
Study of the charge correlation function in one-dimensional Hubbard
  heterostructures

abstract:
  We study inhomogeneous one-dimensional Hubbard systems using the density
matrix renormalization group method. Different heterostructures are
investigated whose configuration is modeled varying parameters like the on-site
Coulomb potential and introducing local confining potentials. We investigate
their Luttinger liquid properties through the parameter K_rho, which
characterizes the decay of the density-density correlation function at large
distances. Our main goal is the investigation of possible realization of
engineered materials and the ability to manipulate physical properties by
choosing an appropriate spatial and/or chemical modulation.


title: Inverse conductivity problem on Riemann surfaces

abstract:
  An electrical potential U on a bordered Riemann surface X with conductivity
function sigma>0 satisfies equation d(sigma d^cU)=0. The problem of effective
reconstruction of sigma is studied. We extend to the case of Riemann surfaces
the reconstruction scheme given, firstly, by R.Novikov (1988) for simply
connected X. We apply for this new kernels for dbar on affine algebraic Riemann
surfaces constructed in Henkin, arXiv:0804.3761


title: Early dissipation and viscosity

abstract:
  We consider dissipative phenomena due to the relaxation of an initial
anisotropic local pressure in the fireball created in relativistic heavy-ion
collisions, both for the Bjorken boost-invariant case and for the azimuthally
symmetric radial expansion with boost-invariance. The resulting increase of the
entropy can be counterbalanced by a suitable retuning of the initial
temperature. An increase of the transverse collective flow is observed. The
influence of the shear viscosity on the longitudinal expansion is also studied.
Viscosity reduces the cooling rate from the longitudinal work and counteracts
the pressure gradients that accelerate the longitudinal flow.


title: Strain relaxation in small adsorbate islands: O on W(110)

abstract:
  The stress-induced lattice changes in a p(1x2) ordered oxygen layer on W(110)
are measured by low-energy electron diffraction. We have observed that small
oxygen islands show a mismatch with the underlying lattice. Our results
indicate that along [1-10] the average mismatch scales inversely with the
island size as 1/L for all oxygen coverages up to 0.5 ML, while along [001] it
is significant only for the smallest oxygen islands and scales as a higher
power of the inverse island size. The behaviour along [1-10] is described by a
one-dimensional finite-size Frenkel-Kontorova model. Using this model, together
with calculated force constants, we make a quantitative estimate for the change
of surface-stress upon oxygen adsorption. The result is consistent with our
ab-initio calculations, which give a relative compressive stress of -4.72 N/m
along [1-10] and a minute relative tensile stress of 0.15 N/m along [001]. The
scaling along [001] is qualitatively explained as an effect induced by the
lattice relaxation in the [1-10] direction.


title:
Partial pluricomplex energy and integrability exponents of
  plurisubharmonic functions

abstract:
  We give a sufficient condition on the Monge-Amp\`ere mass of a
plurisubharmonic function $u$ for $\exp (- 2 u)$ to be locally integrable. This
gives a pluripotential theoretic proof of a theorem by J-P. Demailly.


title:
Displacement-noise-free gravitational-wave detection with a single
  Fabry-Perot cavity: a toy model

abstract:
  We propose a detuned Fabry-Perot cavity, pumped through both the mirrors, as
\textit{a toy model} of the gravitational-wave (GW) detector partially free
from displacement noise of the test masses. It is demonstrated that the noise
of cavity mirrors can be eliminated, but the one of lasers and detectors
cannot. The isolation of the GW signal from displacement noise of the mirrors
is achieved in a proper linear combination of the cavity output signals. The
construction of such a linear combination is possible due to the difference
between the reflected and transmitted output signals of detuned cavity. We
demonstrate that in low-frequency region the obtained displacement-noise-free
response signal is much stronger than the $f^3_{\textrm{gw}}$-limited
sensitivity of displacement-noise-free interferometers recently proposed by S.
Kawamura and Y. Chen. However, the loss of the resonant gain in the noise
cancelation procedure results is the sensitivity limitation of our toy model by
displacement noise of lasers and detectors.


title: The commutative Moufang loops with minimum conditions for subloops I

abstract:
  The structure of the commutative Moufang loops (CML) with minimum condition
for subloops is examined. In particular it is proved that such a CML $Q$ is a
finite extension of a direct product of a finite number of the quasicyclic
groups, lying in the centre of the CML $Q$. It is shown that the minimum
conditions for subloops and for normal subloops are equivalent in a CML.
Moreover, such CML also characterized by different conditions of finiteness of
its multiplication groups.


title:
Distribution of continuous-variable entanglement by separable Gaussian
  states

abstract:
  Entangling two systems at distant locations using a {\it separable} mediating
ancilla is a counterintuitive phenomenon proposed for qubits by T. Cubitt {\it
et al}. [Phys. Rev. Lett. {\bf 91}, 037902 (2003)]. We show that such
entanglement distribution is possible with Gaussian states, using a certain
three-mode fully separable mixed Gaussian state and linear optics elements
readily available in experiments. Two modes of the state become entangled by
sequentially mixing them on two beam splitters, while the third one remains
separable in all stages of the protocol.


title: The commutative Moufang loops with minimum conditions for subloops II

abstract:
  It is proved that the following conditions are equivalent for an infinite
non-associative commutative Moufang loop $Q$: 1) $Q$ satisfies the minimum
condition for subloops; 2) if the loop $Q$ contains a centrally solvable
subloop of class $s$, then it satisfies the minimum condition for centrally
solvable subloops of class $s$; 3) if the loop $Q$ contains a centrally
nilpotent subloop of class $n$, then it satisfies the minimum condition for
centrally nilpotent subloops of class $n$; 4) $Q$ satisfies the minimum
condition for non-invatiant associative subloops. The structure of the
commutative Moufang loops, whose infinite non-associative subloops are normal,
is examined.


title: Nonholonomic systems on Lie algebroids

abstract:
  This paper is a revised version of a previously posted paper in arxiv. The
authors posted it as a new submission by mistake. The latest version of the
paper can be found at arXiv:math-ph/0512003v2


title: The commutative Moufang loops with maximum conditions for subloops

abstract:
  It is proved that the maximum condition for subloops in a commutative Moufang
loop $Q$ is equivalent with the conditions of finite generating of different
subloops of the loop $Q$ and different subgroups of the multiplication group of
the loop $Q$. An analogue equivalence is set for the commutative Moufang
$ZA$-loops.


title: Update of D3/D7-Brane Inflation on K3 x T^2/Z_2

abstract:
  We update the D3/D7-brane inflation model on K3 x T^2/Z_2 with branes and
fluxes. For this purpose, we study the low energy theory including g_s
corrections to the gaugino condensate superpotential that stabilizes the K3
volume modulus. The gauge kinetic function is verified to become holomorphic
when the original N=2 supersymmetry is spontaneously broken to N=1 by bulk
fluxes. From the underlying classical N=2 supergravity, the theory inherits a
shift symmetry which provides the inflaton with a naturally flat potential. We
analyze the fate of this shift symmetry after the inclusion of quantum
corrections. The field range of the inflaton is found to depend significantly
on the complex structure of the torus but is independent of its volume. This
allows for a large kinematical field range for the inflaton. Furthermore, we
show that the D3/D7 model may lead to a realization of the recent CMB fit by
Hindmarsh et al. with an 11% contribution from cosmic strings and a spectral
index close to n_s=1. On the other hand, by a slight change of the parameters
of the model one can strongly suppress the cosmic string contribution and
reduce the spectral index n_s to fit the WMAP5 data in the absence of cosmic
strings. We also demonstrate that the inclusion of quantum corrections allows
for a regime of eternal D3/D7 inflation.


title: On some criterions of finiteness conditions in commutative Moufang loops

abstract:
  The various finiteness conditions in commutative Moufang loops are
characterized using the notions of centralizer of subloops and centralizer of
subgroups of its multiplication group.


title: JSJ Decompositions of Coxeter Groups

abstract:
  The idea of "JSJ-decompositions" for 3-manifolds began with work of
Waldhausen and was developed later through work of Jaco, Shalen and Johansen.
It was shown that there is a finite collection of 2-sided, incompressible tori
that separate a given closed irreducible 3-manifold into pieces with strong
topological structure. Sela introduced the idea of JSJ-decompositions for
groups, an idea that has flourished in a variety of directions. The general
idea is to consider a certain class X of groups and splittings of groups in X
by groups in another class Y. E.g. Rips and Sela considered splittings of
finitely presented groups by infinite cyclic groups. For an arbitrary group G
in X the goal is to produce a unique graph of groups decomposition T of G with
edge groups in Y so that T reveals all graph of groups decompositions of G with
edge groups in Y. More specifically, if V is a vertex group of T then either
there is no Y-group that splits both G and V, or V has a special "surface
group-like" structure. It is standard to call vertex groups of the second type
"orbifold groups". For a finitely generated Coxeter system (W,S) we produce a
reduced JSJ-decomposition T for splittings of W over virtually abelian
subgroups. We show T is unique with each vertex and edge group generated by a
subset of S (and so T is "visual"). The construction of T is algorithmic. If V,
a subset of S, generates an orbifold vertex group of T then V is the disjoint
union of K and M, where < M > is virtually abelian, < K > is virtually a closed
surface group or virtually free and < V > is the direct product of < M > and <
K >.


title: On Frattini subloops and normalizers of commutative Moufang loops

abstract:
  Let $L$ be a commutative Moufang loop (CML) with multiplication group $\frak
M$, and let $\frak F(L)$, $\frak F(\frak M)$ be the Frattini subgroup and
Frattini subgroup of $L$ and $\frak M$ respectively. It is proved that $\frak
F(L) = L$ if and only if $\frak F(\frak M) = \frak M$ and is described the
structure of this CLM. Constructively it is defined the notion of normalizer
for subloops in CML. Using this it is proved that if $\frak F(L) \neq L$ then
$L$ satisfies the normalizer condition and that any divisible subgroup of
$\frak M$ is an abelian group and serves as a direct factor for $\frak M$.


title:
Metaheuristics and Their Hybridization to Solve the Bi-objective Ring
  Star Problem: a Comparative Study

abstract:
  This paper presents and experiments approaches to solve a new bi-objective
routing problem called the ring star problem. It consists of locating a simple
cycle through a subset of nodes of a graph while optimizing two kinds of cost.
The first objective is the minimization of a ring cost that is related to the
length of the cycle. The second one is the minimization of an assignment cost
from non-visited nodes to visited ones. In spite of its obvious bi-objective
formulation, this problem has always been investigated in a single-objective
way. To tackle the bi-objective ring star problem, we first investigate
different stand-alone search methods. Then, we propose two cooperative
strategies that combines two multiple objective metaheuristics: an elitist
evolutionary algorithm and a population-based local search. We apply this new
hybrid approaches to well-known benchmark test instances and demonstrate their
effectiveness in comparison to non-hybrid algorithms and to state-of-the-art
methods.


title: The Kinematics of Thick Disks in Nine External Galaxies

abstract:
  We present kinematic measurements of thin and thick disk components in a
sample of nine edge-on galaxies. We extract stellar and ionized gas rotation
curves at and above the galaxies' midplanes using the Ca II triplet absorption
features and H-alpha emission lines measured with the GMOS spectrographs on
Gemini North and South. For the higher mass galaxies in the sample, we fail to
detect differences between the thin and thick disk kinematics. In the lower
mass galaxies, there is a wide range of thick disk behavior including thick
disks with substantial lag and one counter-rotating thick disk. We compare our
rotation curves with expectations from thick disk formation models and conclude
that the wide variety of thick disk kinematics favors a formation scenario
where thick disk stars are accreted or formed during merger events as opposed
to models that form thick disks through gradual thin disk heating.


title: Kondo resonance in an ac driven quantum dot subjected to finite bias

abstract:
  We employ the time-dependent non-crossing approximation to study the time
averaged conductance for a single electron transistor in the Kondo regime when
the dot level is sinusoidally driven from its equilibrium position by means of
a gate voltage in finite bias. We find that the average conductance exhibits
significant deviation from the monotonous reduction when the applied bias is
equal to the driving frequency of the dot level. We investigate the effect of
the temperature and the driving frequency on the observed enhancement. We
attribute this behaviour to the overlap of the satellite Kondo peaks with the
split Kondo resonances formed at each lead's Fermi level. We display the
spectral function to put our interpretation into more rigorous footing.


title: Hyperlinear and sofic groups: a brief guide

abstract:
  Relatively recently, two new classes of (discrete, countable) groups have
been isolated: hyperlinear groups and sofic groups. They come from different
corners of mathematics (operator algebras and symbolic dynamics, respectively),
and were introduced independently from each other, but are closely related
nevertheless.
  Hyperlinear groups have their origin in Connes' Embedding Conjecture about
von Neumann factors of type $II_1$, while sofic groups, introduced by Gromov,
are motivated by Gottschalk Surjunctivity Conjecture (can a shift $A^G$ contain
a proper isomorphic copy of itself, where $A$ is a finite discrete space and
$G$ is a group?).
  Groups from both classes can be characterized as subgroups of metric
ultraproducts of families of certain metric groups (formed in the same way as
ultraproducts of Banach spaces): unitary groups of finite rank lead to
hyperlinear groups, symmetric groups of finite rank - to sofic groups.
  We offer an introductory guide to some of the main concepts, results, and
sources of the theory, following Connes, Gromov, Benjamin Weiss, Kirchberg,
Ozawa, Radulescu, Elek and Szab\'o, and others, and discuss open questions
which are for the time being perhaps more numerous than the results.


title:
Localization over complex-analytic groupoids and conformal
  renormalization

abstract:
  We present a higher index theorem for a certain class of etale
one-dimensional complex-analytic groupoids. The novelty is the use of the local
anomaly formula established in a previous paper, which represents the bivariant
Chern character of a quasihomomorphism as the chiral anomaly associated to a
renormalized non-commutative chiral field theory. In the present situation the
geometry is non-metric and the corresponding field theory can be renormalized
in a purely conformal way, by exploiting the complex-analytic structure of the
groupoid only. The index formula is automatically localized at the automorphism
subset of the groupoid and involves a cap-product with the sum of two different
cyclic cocycles over the groupoid algebra. The first cocycle is a trace
involving a generalization of the Lefschetz numbers to higher-order fixed
points. The second cocycle is a non-commutative Todd class, constructed from
the modular automorphism group of the algebra.


title: Limit Theorems for Translation Flows

abstract:
  The aim of this paper is to obtain an asymptotic expansion for ergodic
integrals of translation flows on flat surfaces of higher genus (Theorem 1) and
to give a limit theorem for these flows (Theorem 2).


title:
The pion's electromagnetic form factor at small momentum transfer in
  full lattice QCD

abstract:
  We compute the electromagnetic form factor of a "pion" with mass m_pi=330MeV
at low values of Q^2\equiv -q^2, where q is the momentum transfer. The
computations are performed in a lattice simulation using an ensemble of the
RBC/UKQCD collaboration's gauge configurations with Domain Wall Fermions and
the Iwasaki gauge action with an inverse lattice spacing of 1.73(3)GeV. In
order to be able to reach low momentum transfers we use partially twisted
boundary conditions using the techniques we have developed and tested earlier.
For the pion of mass 330MeV we find a charge radius given by
<r_pi^2>_{330MeV}=0.354(31)fm^2 which, using NLO SU(2) chiral perturbation
theory, extrapolates to a value of <r_pi^2>=0.418(31)fm^2 for a physical pion,
in agreement with the experimentally determined result. We confirm that there
is a significant reduction in computational cost when using propagators
computed from a single time-slice stochastic source compared to using those
with a point source; for m_pi=330MeV and volume (2.74fm)^3 we find the
reduction is approximately a factor of 12.


title:
Toward an AdS/cold atoms correspondence: a geometric realization of the
  Schroedinger symmetry

abstract:
  We discuss a realization of the nonrelativistic conformal group (the
Schroedinger group) as the symmetry of a spacetime. We write down a toy model
in which this geometry is a solution to field equations. We discuss various
issues related to nonrelativistic holography. In particular, we argue that free
fermions and fermions at unitarity correspond to the same bulk theory with
different choices for the near-boundary asymptotics corresponding to the source
and the expectation value of one operator. We describe an extended version of
nonrelativistic general coordinate invariance which is realized
holographically.


title: Supersymmetric Wilson loops at two loops

abstract:
  We study the quantum properties of certain BPS Wilson loops in ${\cal N}=4$
supersymmetric Yang-Mills theory. They belong to a general family, introduced
recently, in which the addition of particular scalar couplings endows generic
loops on $S^3$ with a fraction of supersymmetry. When restricted to $S^2$,
their quantum average has been further conjectured to be exactly computed by
the matrix model governing the zero-instanton sector of YM$_2$ on the sphere.
We perform a complete two-loop analysis on a class of cusped Wilson loops lying
on a two-dimensional sphere, finding perfect agreement with the conjecture. The
perturbative computation reproduces the matrix-model expectation through a
highly non-trivial interplay between ladder diagrams and self-energies/vertex
contributions, suggesting the existence of a localization procedure.


title:
Spin, Orbital and Charge Order at the Interface between Correlated
  Oxides

abstract:
  The collective behavior of correlated electrons in the VO$_2-$interface layer
of LaVO$_3$/SrTiO$_3$ heterostructure is studied within a quarter-filled
$t_{2g}$-orbital Hubbard model on a square lattice. We argue that the ground
state is ferromagnetic driven by the double exchange mechanism, and is
orbitally and charge ordered due to a confined geometry and electron
correlations. The orbital and charge density waves open gaps on the entire
Fermi surfaces of all orbitals. The theory explains the observed insulating
behavior of the $p$-type interface between LaVO$_3$ and SrTiO$_3$.


title: True amplitude one-way propagation in heterogeneous media

abstract:
  This paper deals with the numerical analysis of two one-way systems derived
from the general complete modeling proposed by M.V. De Hoop. The main goal of
this work is to compare two different formulations in which a correcting term
allows to improve the amplitude of the numerical solution. It comes out that
even if the two systems are equivalent from a theoretical point of view,
nothing of the kind is as far as the numerical simulation is concerned. Herein
a numerical analysis is performed to show that as long as the propagation
medium is smooth, both the models are equivalent but it is no more the case
when the medium is associated to a quite strongly discontinuous velocity.


title: Matrix product operator representations

abstract:
  We show how to construct relevant families of matrix product operators in one
and higher dimensions. Those form the building blocks for the numerical
simulation methods based on matrix product states and projected entangled pair
states. In particular, we construct translational invariant matrix product
operators suitable for time evolution, and show how such descriptions are
possible for Hamiltonians with long-range interactions. We illustrate how those
tools can be exploited for constructing new algorithms for simulating quantum
spin systems.