title: Collimator effects in proton planning

abstract:
  The present paper pertains to corrections which are due to the presence of
beam-limiting and beam-shaping devices in proton planning. Two types of
corrections are considered: those which are due to the nonzero thickness of
such devices (geometrical effects) and those relating to the scattering of beam
particles off their material. The application of these two types of corrections
is greatly facilitated by decomposing the physical effects (i.e., the
contribution to the fluence) of two-dimensional objects (i.e., of the apertures
of the devices) into one-dimensional, easily-calculable contributions. To
minimise the time requirements in the derivation of the scattering corrections,
a two-step process is introduced. The first step occurs at beam-configuration
phase and comprises the analysis of half-block fluence measurements and the
extraction of the one parameter of the model which is used in the description
of the beamline characteristics; subsequently, a number of Monte-Carlo runs
lead to the determination of the parameters of a convenient parameterisation of
the relevant fluence contributions. The second step involves (at planning time)
the reconstruction of the parameters (which are used in the description of the
scattering contributions) via simple interpolations, performed on the results
obtained during the beam-configuration phase. It is shown that the inclusion of
the scattering effects leads to substantial improvement in the reproduction of
the experimental data. The contributions from the block-thickness and
block-scattering effects have been presented separately in the case of a simple
water phantom. In this example, the maximal contribution of the block-relating
effects amounts to a few percent of the prescribed dose.


title: Reduction dependence of superconductivity in undoped T' cuprates

abstract:
  We have recently achieved superconductivity in undoped T'-RE2CuO4 (RE: Pr,
Nd, Sm, Eu, and Gd), using epitaxial thin films by metal organic decomposition.
The key recipes to achieve superconductivity are low-PO2 firing and subsequent
vacuum reduction to minimize the amount of impurity oxygen atoms, which are
very harmful to high-Tc superconductivity. In this article, we report our
investigation on the reduction dependence of superconductivity of T'-RE2CuO4.
For thin films, the amount of remnant Oap atoms is difficult to evaluate but we
propose that one good measure for this may be the c-axis lattice constant,
which tells us whether the reduction is insufficient or excessive.


title: Chirped-pulse oscillators: a unified standpoint

abstract:
  A completely analytical and unified approach to the theory of chirped-pulse
oscillators is presented. The approach developed is based on the approximate
integration of the generalized nonlinear complex Ginzburg-Landau equation and
demonstrates that a chirped-pulse oscillator is controlled by only two
parameters. It makes it easy to trace spread of the real-world characteristics
of both solid-state and fiber oscillators operating in the positive dispersion
regime.


title: Atomic entanglement sudden death in a strongly driven cavity QED system

abstract:
  We study the entanglement dynamics of strongly driven atoms off-resonantly
coupled with cavity fields. We consider conditions characterized not only by
the atom-field coupling but also by the atom-field detuning. By studying two
different models within the framework of cavity QED, we show that the so-called
atomic entanglement sudden death (ESD) always occurs if the atom-field coupling
lager than the atom-field detuning, and is independent of the type of initial
atomic state.


title: The seismology programme of CoRoT

abstract:
  We introduce the main lines and specificities of the CoRoT Seismology Core
Programme. The development and consolidation of this programme has been made in
the framework of the CoRoT Seismology Working Group. With a few illustrative
examples, we show how CoRoT data will help to address various problems
associated with present open questions of stellar structure and evolution.


title: Parallel GPU Implementation of Iterative PCA Algorithms

abstract:
  Principal component analysis (PCA) is a key statistical technique for
multivariate data analysis. For large data sets the common approach to PCA
computation is based on the standard NIPALS-PCA algorithm, which unfortunately
suffers from loss of orthogonality, and therefore its applicability is usually
limited to the estimation of the first few components. Here we present an
algorithm based on Gram-Schmidt orthogonalization (called GS-PCA), which
eliminates this shortcoming of NIPALS-PCA. Also, we discuss the GPU (Graphics
Processing Unit) parallel implementation of both NIPALS-PCA and GS-PCA
algorithms. The numerical results show that the GPU parallel optimized
versions, based on CUBLAS (NVIDIA) are substantially faster (up to 12 times)
than the CPU optimized versions based on CBLAS (GNU Scientific Library).


title: Cesaro summation and multiplicative functions on a symmetric group

abstract:
  We investigate the summability in sense of Cesaro and its applications to
investigation of the mean values of multiplicative functions on permutations.


title:
A role-free approach to indexing large RDF data sets in secondary memory
  for efficient SPARQL evaluation

abstract:
  Massive RDF data sets are becoming commonplace. RDF data is typically
generated in social semantic domains (such as personal information management)
wherein a fixed schema is often not available a priori. We propose a simple
Three-way Triple Tree (TripleT) secondary-memory indexing technique to
facilitate efficient SPARQL query evaluation on such data sets. The novelty of
TripleT is that (1) the index is built over the atoms occurring in the data
set, rather than at a coarser granularity, such as whole triples occurring in
the data set; and (2) the atoms are indexed regardless of the roles (i.e.,
subjects, predicates, or objects) they play in the triples of the data set. We
show through extensive empirical evaluation that TripleT exhibits multiple
orders of magnitude improvement over the state of the art on RDF indexing, in
terms of both storage and query processing costs.


title: The planar algebra of diagonal subfactors

abstract:
  There is a natural construction which associates to a finitely generated,
countable, discrete group $G$ and a 3-cocycle $\omega$ of $G$ an inclusion of
II$_1$ factors, the so-called diagonal subfactors (with cocycle). In the case
when the cocycle is trivial these subfactors are well studied and their
standard invariant (or planar algebra) is known. We give a description of the
planar algebra of these subfactors when a cocycle is present. The action of
Jones' planar operad involves the 3-cocycle $\omega$ explicitly and some
interesting identities for 3-cocycles appear when naturality of the action is
verified.


title: Paths and Kostka--Macdonald Polynomials

abstract:
  We give several equivalent combinatorial descriptions of the space of states
for the box-ball systems, and connect certain partition functions for these
models with the q-weight multiplicities of the tensor product of the
fundamental representations of the Lie algebra gl(n). As an application, we
give an elementary proof of the special case t=1 of the Haglund--Haiman--Loehr
formula. Also, we propose a new class of combinatorial statistics that
naturally generalize the so-called energy statistics.


title:
Translational Invariance and the Anisotropy of the Cosmic Microwave
  Background

abstract:
  Primordial quantum fluctuations produced by inflation are conventionally
assumed to be statistically homogeneous, a consequence of translational
invariance. In this paper we quantify the potentially observable effects of a
small violation of translational invariance during inflation, as characterized
by the presence of a preferred point, line, or plane. We explore the imprint
such a violation would leave on the cosmic microwave background anisotropy, and
provide explicit formulas for the expected amplitudes $<a_{lm}a_{l'm'}^*>$ of
the spherical-harmonic coefficients.


title:
Measurement of acoustic properties of South Pole ice for neutrino
  astronomy

abstract:
  South Pole ice is predicted to be the best medium for acoustic neutrino
detection. Moreover, ice is the only medium in which all three dense-medium
detection methods (optical, radio, and acoustic) can be used to monitor the
same interaction volume. Events detected in coincidence between two methods
allow significant background rejection confidence, which is necessary to study
rare GZK neutrinos. In 2007 and 2008 the South Pole Acoustic Test Setup (SPATS)
was installed as a research and development project associated with the IceCube
experiment. The purpose of SPATS is to measure the acoustic ice properties at
the South Pole in order to determine the feasibility of a future large hybrid
array. The deployment and performance of SPATS are described, as are first
results and work in progress on the sound speed, background noise, and
attenuation.


title: Invariants, cohomology, and automorphic forms of higher order

abstract:
  A general structure theorem on higher order invariants is proven. For an
arithmetic group, the structure of the corresponding Hecke module is
determined. It is shown that the module does not contain any irreducible
submodule. This explains the fact that L-functions of higher order forms have
no Euler-product. Higher order cohomology is introduced, classical results of
Borel are generalized and a higher order version of Borel's conjecture is
stated.


title:
On the Closing Lemma problem for vector fields of bounded type on the
  torus

abstract:
  We investigate the open Closing Lemma problem for vector fields on the
2-dimensional torus. Under the assumption of bounded type rotation number, the
$C^r$ Closing Lemma is verified for smooth vector fields that are
area-preserving at all saddle points. Namely, given such a $C^r$ vector field
$X$, $r\geq 4$, with a non-trivially recurrent point $p$, there exists a vector
field $Y$ arbitrarily near to $X$ in the $C^r$ topology and obtained from $X$
by a twist perturbation, such that $p$ is a periodic point of $Y$.
  The proof relies on a new result in 1-dimensional dynamics on the
non-existence of semi-wandering intervals of smooth maps of the circle.


title:
Luminosity of a quark star undergoing torsional oscillations and the
  problem of gamma ray bursts

abstract:
  We discuss whether the winding-up of the magnetic field by differential
rotation in a new-born quark star can produce a sufficiently-high, energy,
emission rate of sufficiently long duration to explain long gamma-ray bursts.
  In the context of magnetohydrodynamics, we study the torsional oscillations
and energy extraction from a new-born, hot, differentially rotating quark star.
  The new-born compact star is a rapid rotator that produces a relativistic,
leptonic wind. The star's torsional oscillation modulates this wind emission
considerably when it is odd and of sufficient amplitude, which is relatively
easy to reach. Odd oscillations may occur just after the formation of a quark
star. Other asymmetries can cause similar effects. The buoyancy of wound-up
magnetic fields is inhibited, or its effects are limited, by a variety of
different mechanisms. Direct electromagnetic emission by the torsional
oscillation in either an outside vacuum or the leptonic wind surrounding the
compact object is found to be insignificant. In contrast, the twist given to
the outer magnetic field by an odd torsional oscillation is generally
sufficient to open the star's magnetosphere. The Poynting emission of the star
in its leptonic environment is then radiated from all of its surface and is
enhanced considerably during these open episodes, tapping at the bulk
rotational energy of the star. This results in intense energy shedding in the
first tens of minutes after the collapse of magnetized quark stars with an
initial poloidal field of order of 10**14 Gauss, sufficient to explain long
gamma-ray bursts.


title: Correlators of N=1 Superconformal Currents

abstract:
  We give an explicit expression for the M-point correlator of the
superconformal current in two dimensional N=1 superconformal field theories.


title:
Continuous-variable quantum information processing with squeezed states
  of light

abstract:
  We investigate experiments of continuous-variable quantum information
processing based on the teleportation scheme. Quantum teleportation, which is
realized by a two-mode squeezed vacuum state and measurement-and-feedforward,
is considered as an elementary quantum circuit as well as quantum
communication. By modifying ancilla states or measurement-and-feedforwards, we
can realize various quantum circuits which suffice for universal quantum
computation. In order to realize the teleportation-based computation we improve
the level of squeezing, and fidelity of teleportation. With a high-fidelity
teleporter we demonstrate some advanced teleportation experiments, i.e.,
teleportation of a squeezed state and sequential teleportation of a coherent
state. Moreover, as an example of the teleportation-based computation, we build
a QND interaction gate which is a continuous-variable analog of a CNOT gate. A
QND interaction gate is constructed only with ancillary squeezed vacuum states
and measurement-and-feedforwards. We also create continuous-variable four mode
cluster type entanglement for further application, namely, one-way quantum
computation.


title: Functions holomorphic along holomorphic vector fields

abstract:
  The main result of the paper is the following generalization of Forelli's
theorem: Suppose F is a holomorphic vector field with singular point at p, such
that F is linearizable at p and the matrix is diagonalizable with the
eigenvalues whose ratios are positive reals. Then any function $\phi$ that has
an asymptotic Taylor expansion at p and is holomorphic along the complex
integral curves of F is holomorphic in a neighborhood of p.
  We also present an example to show that the requirement for ratios of the
eigenvalues to be positive reals is necessary.


title: Does a billiard orbit determine its (polygonal) table?

abstract:
  We introduce a new equivalence relation on the set of all polygonal
billiards. We say that two billiards (or polygons) are order equivalent if each
of the billiards has an orbit whose footpoints are dense in the boundary and
the two sequences of footpoints of these orbits have the same combinatorial
order. We study this equivalence relation with additional regularity conditions
on the orbit.


title:
Allocation of control and data channels for Large-Scale Wireless Sensor
  Networks

abstract:
  Both IEEE 802.15.4 and 802.15.4a standards allow for dynamic channel
allocation and use of multiple channels available at their physical layers but
its MAC protocols are designed only for single channel. Also, sensor's
transceivers such as CC2420 provide multiple channels and as shown in [1], [2]
and [3] channel switch latency of CC2420 transceiver is just about 200$\mu$s.
In order to enhance both energy efficiency and to shorten end to end delay, we
propose, in this report, a spectrum-efficient frequency allocation schemes that
are able to statically assign control channels and dynamically reuse data
channels for Personal Area Networks (PANs) inside a Large-Scale WSN based on
UWB technology.


title:
Rotational spectrum of deuterated and 15N ethyl cyanides: CH3CHDCN and
  CH2DCH2CN and of CH3CH2C15N

abstract:
  Ethyl cyanide is an abundant molecule in hot molecular clouds. Lines from 13C
isotopically substituted ethyl cyanide were identified in Orion. To enable the
search and the possible detection of other isotopologues of ethyl cyanide in
interstellar objects, we have studied the rotational spectrum of deuterated
ethyl cyanide: CH2DCH2CN (in-plane and out-of-plane) and CH3CHDCN and the
spectrum of15N substituted ethyl cyanide CH3CH2C15N. The rotational spectrum of
each species in the ground state was measured in the microwave and
millimeter-submillimeter wavelength range using a waveguide Fourier transform
spectrometer (8 - 17 GHz) and a source-modulated spectrometer employing
backward-wave oscillators (BWOs) (150 - 260 and 580 - 660 GHz). From the
fitting procedure, accurate spectroscopic constants were derived for each of
the species. These new sets of spectroscopic constants enable us to predict
reliably the rotational spectrum (lines frequencies and intensities) in the
4-1000 GHz frequency range and for J and Ka up to 80 and 31, respectively.
Combined with IRAM 30 m antenna observations of Orion, this experimental study
allowed us to detect 15N substituted ethyl cyanide for the first time in Orion.
The derived column density and rotational temperature are 10^13 cm-2 and 150 K
for the plateau and 3 10^14 cm-2 and 300 K for the hot core. The deuterated
species were searched for but were not detected. The upper limit to the column
density of each deuterated isotopologues was 10^14 cm-2.


title: Spectrum of large random reversible Markov chains: two examples

abstract:
  We take on a Random Matrix theory viewpoint to study the spectrum of certain
reversible Markov chains in random environment. As the number of states tends
to infinity, we consider the global behavior of the spectrum, and the local
behavior at the edge, including the so called spectral gap. Results are
obtained for two simple models with distinct limiting features. The first model
is built on the complete graph while the second is a birth-and-death dynamics.
Both models give rise to random matrices with non independent entries.


title: Multi-orbital Effects in Optical Properties of Vanadium Sesquioxide

abstract:
  Vanadium sesquioxide, V2O3, boasts a rich phase diagram whose description
necessitates the accounting for many-body Coulomb correlations. Spectral
properties of this compound have been successfully addressed within dynamical
mean field theory to an extent that results of recent angle resolved
photoemission experiments have been correctly predicted. While photoemission
spectroscopy probes the occupied part of the one-particle spectrum, optical
experiments measure transitions into empty states and thus provide
complementary information. In this work, we focus on the optical properties of
V2O3 in its paramagnetic phases by employing our recently developed
"generalized Peierls approach". Compared to experiments, we obtain results in
overall satisfactory agreement. Further, we rationalize that the experimentally
observed temperature dependence stems from the different coherence scales of
the involved charge carriers.


title:
Acoustic noise in deep ice and environmental conditions at the South
  Pole

abstract:
  To study the acoustic properties of the Antarctic ice the South Pole Acoustic
Test Setup (SPATS) was installed in the upper part of drill holes for the
IceCube neutrino observatory. An important parameter for the design of a future
acoustic neutrino telescope is the acoustic background noise in the ice and its
spatial and temporal variations. We study the absolute noise level depth
profile from SPATS data and discuss systematic uncertainties. The measured
noise is very stable over one year of data taking, and we estimate the absolute
noise level to be < 10 mPa in the frequency range from 10 kHz to 50 kHz at
depths below 200 m. This noise level is of the same order of magnitude as
observed by ocean based acoustic neutrino detection projects in good weather
conditions.


title:
Manifestation of three-body forces in three-body Bethe-Salpeter and
  light-front equations

abstract:
  Bethe-Salpeter and light-front bound state equations for three scalar
particles interacting by scalar exchange-bosons are solved in ladder
truncation. In contrast to two-body systems, the three-body binding energies
obtained in these two approaches differ significantly from each other: the
ladder kernel in light-front dynamics underbinds by approximately a factor of
two compared to the ladder Bethe-Salpeter equation. By taking into account
three-body forces in the light-front approach, generated by two exchange-bosons
in flight, we find that most of this difference disappears; for small exchange
masses, the obtained binding energies coincide with each other.


title: Lopsided Spiral Galaxies

abstract:
  The light distribution in the disks of many galaxies is non-axisymmetric or
`lopsided' with a spatial extent much larger along one half of a galaxy than
the other, as in M101. Recent near-IR observations show that lopsidedness is
common. The stellar disks in nearly 30 % of galaxies have significant
lopsidedness, greater than 10 % measured as the Fourier amplitude of the m=1
component normalized to the average value. This asymmetry is traced
particularly well by the atomic hydrogen gas distribution lying in the outer
parts. The lopsidedness also occurs in the nuclear regions, where the nucleus
is offset with respect to the outer isophotes. The galaxies in a group
environment show higher lopsidedness. The origin of lopsidedness could be due
to the disk response to a tidally distorted halo, or via gas accretion. The
lopsidedness has a large impact on the dynamics of the galaxy, its evolution,
the star formation in it, and on the growth of the central black hole and on
the nuclear fueling, merging of binary black holes etc. The disk lopsidedness
can be used as a diagnostic to study the halo asymmetry. This is an emerging
area in galactic structure and dynamics. In this review, the observations to
measure the lopsided distribution, as well as the theoretical progress made so
far to understand its origin and properties, and the related open problems will
be discussed. (abridged).


title:
The Kondo Lattice Model in Infinite Dimensions II. Static
  Susceptibilities and Phase Diagram

abstract:
  Magnetic and charge susceptibilities in the Kondo lattice are derived by the
continuous-time quantum Monte Carlo (CT-QMC) method combined with the dynamical
mean-field theory. For a weak exchange coupling J and near half filling of the
conduction band, antiferromagnetic transition occurs as signalled by divergence
of the staggered magnetic susceptibility with lowering temperature. With
increasing J, the Kondo effect suppresses the divergence, and the critical
value of J agrees well with Doniach's estimate which considers the RKKY
interaction as competing with the Kondo effect. For low density of conduction
electrons, a ferromagnetic ordering is observed where Doniach's estimate does
not work. Around quarter filling, a charge-density-wave (CDW) transition is
found. The CDW is interpreted from the strong-coupling limit in terms of
effective repulsion between Kondo singlets.


title:
Symbolic Backwards-Reachability Analysis for Higher-Order Pushdown
  Systems

abstract:
  Higher-order pushdown systems (PDSs) generalise pushdown systems through the
use of higher-order stacks, that is, a nested "stack of stacks" structure.
These systems may be used to model higher-order programs and are closely
related to the Caucal hierarchy of infinite graphs and safe higher-order
recursion schemes.
  We consider the backwards-reachability problem over higher-order Alternating
PDSs (APDSs), a generalisation of higher-order PDSs. This builds on and extends
previous work on pushdown systems and context-free higher-order processes in a
non-trivial manner. In particular, we show that the set of configurations from
which a regular set of higher-order APDS configurations is reachable is regular
and computable in n-EXPTIME. In fact, the problem is n-EXPTIME-complete.
  We show that this work has several applications in the verification of
higher-order PDSs, such as linear-time model-checking, alternation-free
mu-calculus model-checking and the computation of winning regions of
reachability games.


title: Effective Band Structure of Correlated Materials - The Case of VO2

abstract:
  Vanadium dioxide, VO2, and its metal-insulator transition at T=340K continues
to receive considerable interest. The question whether the physics of the
insulating low-temperature phase is dominated by the Mott or the Peierls
scenario, i.e. by correlation or band effects, is still under debate. A recent
cluster dynamical mean field theory calculation [Biermann et al, Phys. Rev.
Lett., 94, 026404 (2005)] suggests a combination of both effects,
characterizing the transition as of a correlation assisted Peierls type. In
this paper we present a detailed analysis of the excitation spectrum of the
insulating M1 phase of VO2, based on this calculation. We implement a scheme to
analytically continue self-energies from Matsubara to real frequencies, and
study the physics of the strong interactions, as well as the corresponding
changes with respect to the density functional theory (LDA) band structure. We
find that in the M1 phase life-time effects are rather negligible, indeed
allowing for an effective band structure description. A frequency independent
but orbital dependent potential, constructed as an approximation to the full
cluster dynamical mean field self-energy, turns out to satisfactory reproduce
the fully interacting one-particle spectrum, acting as a scissors operator
which pushes the a1g bonding and egp bands apart and, thus, opening the gap.


title:
On nonlocal symmetries, nonlocal conservation laws and nonlocal
  transformations of evolution equations

abstract:
  We discuss nonlocal symmetries and nonlocal conservation laws that follow
from the systematic potentialisation of evolution equations. Those are the Lie
point symmetries of the auxiliary systems, also known as potential symmetries.
We define higher-degree potential symmetries which then lead to nonlocal
conservation laws and nonlocal transformations for the equations. We
demonstrate our approach by the Burgers' hierarchy and the
Calogero-Degasperis-Ibragimov-Shabat hierarchy.


title: 3D acoustic imaging applied to the Baikal Neutrino Telescope

abstract:
  A hydro-acoustic imaging system was tested in a pilot study on distant
localization of elements of the Baikal underwater neutrino telescope. For this
innovative approach, based on broad band acoustic echo signals and strictly
avoiding any active acoustic elements on the telescope, the imaging system was
temporarily installed just below the ice surface, while the telescope stayed in
its standard position at 1100 m depth. The system comprised an antenna with
four acoustic projectors positioned at the corners of a 50 meter square;
acoustic pulses were "linear sweep-spread signals" - multiple-modulated
wide-band signals (10-22 kHz) of 51.2 s duration. Three large objects (two
string buoys and the central electronics module) were localized by the 3D
acoustic imaging, with a accuracy of ~0.2 m (along the beam) and ~1.0 m
(transverse). We discuss signal forms and parameters necessary for improved 3D
acoustic imaging of the telescope, and suggest a layout of a possible
stationary bottom based 3D imaging setup. The presented technique may be of
interest for neutrino telescopes of km3-scale and beyond, as a flexible
temporary or as a stationary tool to localize basic telescope elements, while
these are completely passive.


title: Isotropic Ornstein-Uhlenbeck flows

abstract:
  Isotropic Brownian flows (IBFs) are a fairly natural class of stochastic
flows which has been studied extensively by various authors. Their rich
structure allows for explicit calculations in several situations and makes them
a natural object to start with if one wants to study more general stochastic
flows. Often the intuition gained by understanding the problem in the context
of IBFs transfers to more general situations. However, the obvious link between
stochastic flows, random dynamical systems and ergodic theory cannot be
exploited in its full strength as the IBF does not have an invariant
probability measure but rather an infinite one. Isotropic Ornstein-Uhlenbeck
flows are in a sense localized IBFs and do have an invariant probability
measure. The imposed linear drift destroys the translation invariance of the
IBF, but many other important structure properties like the Markov property of
the distance process remain valid and allow for explicit calculations in
certain situations. The fact that isotropic Ornstein-Uhlenbeck flows have
invariant probability measures allows one to apply techniques from random
dynamical systems theory. We demonstrate this by applying the results of
Ledrappier and Young to calculate the Hausdorff dimension of the statistical
equilibrium of an isotropic Ornstein-Uhlenbeck flow.


title:
Resource Allocation for Downlink Cellular OFDMA Systems: Part I -
  Optimal Allocation

abstract:
  In this pair of papers (Part I and Part II in this issue), we investigate the
issue of power control and subcarrier assignment in a sectorized two-cell
downlink OFDMA system impaired by multicell interference. As recommended for
WiMAX, we assume that the first part of the available bandwidth is likely to be
reused by different base stations (and is thus subject to multicell
interference) and that the second part of the bandwidth is shared in an
orthogonal way between the different base stations (and is thus protected from
multicell interference).
  Although the problem of multicell resource allocation is nonconvex in this
scenario, we provide in Part I the general form of the global solution. In
particular, the optimal resource allocation turns out to be "binary" in the
sense that, except for at most one pivot-user in each cell, any user receives
data either in the reused bandwidth or in the protected bandwidth, but not in
both. The determination of the optimal resource allocation essentially reduces
to the determination of the latter pivot-position.


title: The BAIKAL neutrino experiment - physics results and perspectives

abstract:
  We review the status of the Lake Baikal Neutrino Experiment. The Neutrino
Telescope NT200 has been operating since 1998 and has been upgraded to the 10
Mton detector NT200+ in 2005. We present selected astroparticle physics results
from long-term operation of NT200. Also discussed are activities towards
acoustic detection of UHE-energy neutrinos, and results of associated science
activities. Preparation towards a km3-scale (Gigaton volume) detector in Lake
Baikal is currently a central activity. As an important milestone, a
km3-prototype string, based on completely new technology, has been installed
and is operating together with NT200+ since April, 2008.


title: The prototype string for the km3-scale Baikal neutrino telescope

abstract:
  A prototype string for the future km3-scale Baikal neutrino telescope has
been deployed in April, 2008 and is fully integrated into the NT200+ telescope.
All basic string elements - optical modules (with 12"/13" hemispherical
photomultipliers), 200MHz FADC readout and calibration system - have been
redesigned following experience with NT200+. First results of in-situ operation
of this prototype string are presented.


title: Magnetic Monopole Search with the SLIM Experiment

abstract:
  The SLIM experiment was an array of 427 m^2 of nuclear track detectors,
exposed at a high altitude laboratory (Chacaltaya, Bolivia, 5230 m a.s.l.), for
~4.22 years. SLIM was sensitive to downgoing intermediate mass magnetic
monopoles with masses in the range 10^5 to 10^12 GeV. The analysis of the full
detector gives a flux upper limit of 1.3x10^{-15} 1/(cm^2*s*sr) (90% C.L.) for
downgoing fast intermediate magnetic monopoles.


title:
Resource Allocation for Downlink Cellular OFDMA Systems: Part II -
  Practical Algorithms and Optimal Reuse Factor

abstract:
  In a companion paper, we characterized the optimal resource allocation in
terms of power control and subcarrier assignment, for a downlink sectorized
OFDMA system. In our model, the network is assumed to be one dimensional for
the sake of analysis. We also assume that a certain part of the available
bandwidth is likely to be reused by different base stations while that the
other part of the bandwidth is shared in an orthogonal way between these base
stations. The optimal resource allocation characterized in Part I is obtained
by minimizing the total power spent by the network under the constraint that
all users rate requirements are satisfied. When optimal resource allocation is
used, any user receives data either in the reused bandwidth or in the protected
bandwidth, but not in both (except for at most one pivot-user in each cell). We
also proposed an algorithm that determines the optimal values of users resource
allocation parameters. The optimal allocation algorithm proposed in Part I
requires a large number of operations. In the present paper, we propose a
distributed practical resource allocation algorithm with low complexity. We
study the asymptotic behavior of both this simplified resource allocation
algorithm and the optimal resource allocation algorithm of Part I as the number
of users in each cell tends to infinity. Our analysis allows to prove that the
proposed simplified algorithm is asymptotically optimal. As a byproduct of our
analysis, we characterize the optimal value of the frequency reuse factor.


title: Three-body forces in Bethe-Salpeter and light-front equations

abstract:
  In relativistic frameworks, given by the Bethe-Salpeter and light-front bound
state equations, the binding energies of system of three scalar particles
interacting by scalar exchange particles are calculated. In contrast to
two-body systems, the three-body binding energies obtained in these two
approaches differ significantly from each other: the ladder kernel in
light-front dynamics underbinds by approximately a factor of two compared to
the ladder Bethe-Salpeter equation. By taking into account three-body forces in
the light-front approach, generated by two exchange particles in flight, we
find that most of this difference disappears; for small exchange masses, the
obtained binding energies coincide with each other.


title: HADES - Hydrophone for Acoustic Detection at South Pole

abstract:
  The South Pole Acoustic Test Setup (SPATS) is located in the upper part of
the optical neutrino observatory IceCube, currently under construction. SPATS
consists of four strings at depths between 80 m and 500 m below the surface of
the ice with seven stages per string. Each stage is equipped with an acoustic
sensor and a transmitter. Three strings (string A-C) were deployed in the
austral summer 2006/07. SPATS was extended by a fourth string (string D) with
second generation sensors and transmitters in 2007/08. One second generation
sensor type HADES (Hydrophone for Acoustic Detection at South Pole) consists of
a ring-shaped piezo-electric element coated with polyurethane. The development
of the sensor, optimization of acoustic transmission by acoustic impedance
matching and first in-situ results will be discussed.


title:
Selection of variables and dimension reduction in high-dimensional
  non-parametric regression

abstract:
  We consider a $l_1$-penalization procedure in the non-parametric Gaussian
regression model. In many concrete examples, the dimension $d$ of the input
variable $X$ is very large (sometimes depending on the number of observations).
Estimation of a $\beta$-regular regression function $f$ cannot be faster than
the slow rate $n^{-2\beta/(2\beta+d)}$. Hopefully, in some situations, $f$
depends only on a few numbers of the coordinates of $X$. In this paper, we
construct two procedures. The first one selects, with high probability, these
coordinates. Then, using this subset selection method, we run a local
polynomial estimator (on the set of interesting coordinates) to estimate the
regression function at the rate $n^{-2\beta/(2\beta+d^*)}$, where $d^*$, the
"real" dimension of the problem (exact number of variables whom $f$ depends
on), has replaced the dimension $d$ of the design. To achieve this result, we
used a $l_1$ penalization method in this non-parametric setup.


title:
Prevalence of approximate square root t relaxation for the dielectric
  alpha process in viscous organic liquids

abstract:
  This paper presents dielectric relaxation data for organic glass-forming
liquids compiled from different groups and supplemented by new measurements.
The main quantity of interest is the "minimum slope" of the $\alpha$ dielectric
loss plotted as a function of frequency in a log-log plot (i.e., the
numerically largest slope above the loss peak frequency). The data consisting
of 347 spectra for 53 liquids show prevalence of minimum slopes close to -1/2,
corresponding to approximate square-root-time dependence of the dielectric
relaxation function at short times. The paper further studies possible
correlations between minimum slopes and: 1) Temperature quantified via the
loss-peak frequency; 2) How well an inverse power law fits data above the loss
peak; 3) Degree of time-temperature superposition; 4) Loss-peak half width; 5)
Deviation from non-Arrhenius behavior; 6) Loss strength. For the first three
points we find correlations that indicate a special status of liquids with
minimum slopes close to -1/2. For the last three points only fairly
insignificant correlations are found with the exception of large-loss liquids,
which have minimum slopes that are numerically significantly larger than 1/2
and loss peak widths that are significantly smaller than those of most other
liquids. We conclude that -- excluding large-loss liquids -- approximate $\sqrt
t$ relaxation appears to be a generic property of the $\alpha$ relaxation of
organic glass formers.


title: Stability of supercooled binary liquid mixtures

abstract:
  Recently the supercooled Wahnstrom binary Lennard-Jones mixture was partially
crystallized into ${\rm MgZn_2}$ phase crystals in lengthy Molecular Dynamics
simulations. We present Molecular Dynamics simulations of a modified
Kob-Andersen binary Lennard-Jones mixture that also crystallizes in lengthy
simulations, here however by forming pure fcc crystals of the majority
component. The two findings motivate this paper that gives a general
thermodynamic and kinetic treatment of the stability of supercooled binary
mixtures, emphasizing the importance of negative mixing enthalpy whenever
present. The theory is used to estimate the crystallization time in a
Kob-Andersen mixture from the crystallization time in a series of relared
systems. At T=0.40 we estimate this time to be 5$\times 10^{7}$ time units
($\approx 1. ms$). A new binary Lennard-Jones mixture is proposed that is not
prone to crystallization and faster to simulate than the two standard binary
Lennard-Jones mixtures; this is obtained by removing the like-particle
attractions by switching to Weeks-Chandler-Andersen type potentials, while
maintaining the unlike-particle attraction.


abstract:
  Ionization of highly charged relativistic ions by neutral atoms and ions is
considered. Numerical results of recently developed computer codes based on the
relativistic Born and the equivalent-photon approximations are presented. The
ionization of the outer shells dominate. For the outer projectile electron
shells, which give the main contribution to the process, the non-relativistic
Schr\"odinger wave functions can be used. The formulae for the non-relativistic
reduction of the Dirac matrix-elements are obtained for ionization of electrons
with arbitrary quantum numbers $n$ and $\ell$.


title:
Cosmological scenario of stop NLSP with gravitino LSP and the cosmic
  lithium problem

abstract:
  The discrepancy on Li^7 and Li^6 abundances between the observational data
and the standard Big Bang Nucleosynthesis theory prediction has been a nagging
problem in astrophysics and cosmology, given the highly attractive and
succesful Big Bang paradigm. One possible solution of this lithium problem is
through hadronic decays of a massive metastable particle which alter the
primordial element abundances. We explore this possibility using gravitino dark
matter framework in which the next lightest supersymmetric particle (NLSP) is
typically long-lived. We found that stop NLSP can provide an attractive
solution to the lithium problem.


title:
Analysis of the possibility of analog detectors calibration by
  exploiting Stimulated Parametric Down Conversion

abstract:
  Spontaneous parametric down conversion (SPDC) has been largely exploited as a
tool for absolute calibration of photon-counting detectors, i.e detectors
registering very small photon fluxes. In [J. Opt. Soc. Am. B 23, 2185 (2006)]
we derived a method for absolute calibration of analog detectors using SPDC
emission at higher photon fluxes, where the beam is seen as a continuum by the
detector. Nevertheless intrinsic limitations appear when high-gain regime of
SPDC is required to reach even larger photon fluxes. Here we show that
stimulated parametric down conversion allow one to avoid this limitation, since
stimulated photon fluxes are increased by the presence of the seed beam.


title: Single-parameter quantized charge pumping in high magnetic fields

abstract:
  We study single-parameter quantized charge pumping via a semiconductor
quantum dot in high magnetic fields. The quantum dot is defined between two top
gates in an AlGaAs/GaAs heterostructure. Application of an oscillating voltage
to one of the gates leads to pumped current plateaus in the gate
characteristic, corresponding to controlled transfer of integer multiples of
electrons per cycle. In a perpendicular-to-plane magnetic field the plateaus
become more pronounced indicating an improved current quantization. Current
quantization is sustained up to magnetic fields where full spin polarization of
the device can be expected.


title:
Characterization and parameterization of the singular manifold of a
  simple 6-6 Stewart platform

abstract:
  This paper presents a study of the characterization of the singular manifold
of the six-degree-of-freedom parallel manipulator commonly known as the Stewart
platform. We consider a platform with base vertices in a circle and for which
the bottom and top plates are related by a rotation and a contraction. It is
shown that in this case the platform is always in a singular configuration and
that the singular manifold can be parameterized by a scalar parameter.


title: Substitution Effects on FeSe Superconductor

abstract:
  We have investigated the effect of atomic substitutions in the FeSe system,
which exhibits the simplest crystal structure among the iron-based
superconductors. An enhancement of the superconducting transition temperature
Tc was observed with the substitution of S or Te for Se; the Tc increased with
S substitution by up to 20 %, and also increased with Te substitution up to 75
%. In contrast, Co or Ni substitutions for the Fe site significantly suppressed
superconductivity. In this work we present a detailed description of the
substitution technique employed to determine Tc in the FeSe system.


title: Electrons in finite superlattices: the birth of crystal momentum

abstract:
  Properties of electrons in superlattices (SLs) of a finite length are
described using standing waves resulting from the fixed boundary conditions
(FBCs) at both ends. These electron properties are compared with those
predicted by the standard treatments using running waves (Bloch states)
resulting from the cyclic boundary conditions (CBCs). It is shown that, while
the total number of eigenenergies in a miniband is the same according to both
treatments, the number of different energies is twice higher according to the
FBCs. It is also shown that the wave vector values corresponding to the
eigenenergies are spaced twice as densely for the FBCs as for the CBCs. The
reason is that a running wave is characterized by a single value of wave vector
k, while a standing wave in a finite SL is characterized by a pair of
wavevectors +/- q. Using numerical solutions of the Schroedinger equation for
an electron in an increasing number N of periodic quantum wells (beginning with
N = 2) we investigate the "birth" of an energy miniband and of a Brillouin zone
according to the two approaches. Using the Fourier transforms of the computed
wave functions for a few quantum wells we follow the "birth" of electron's
momentum. It turns out that the latter can be discerned already for a system of
two wells. We show that the number of higher values of the wave vector q
involved in an eigenenergy state is twice higher for a standing wave with FBCs
than for a corresponding Bloch state. Experiments using photons and phonons are
proposed to observe the described properties of electrons in finite
superlattices.


title: All harmonic 2-spheres in the unitary group, completely explicitly

abstract:
  We give a completely explicit formula for all harmonic maps of finite uniton
number from a Riemann surface to the unitary group U(n) in any dimension, and
so all harmonic maps from the 2-sphere, in terms of freely chosen meromorphic
functions on the surface and their derivatives, using only combinations of
projections and avoiding the usual dbar-problems or loop group factorizations.
We interpret our constructions using Segal's Grassmannian model, giving an
explicit factorization of the algebraic loop group, and showing how to obtain
harmonic maps into a Grassmannian.


title: CAIXA: a Catalogue of AGN In the XMM-Newton Archive I. Spectral analysis

abstract:
  We present CAIXA, a Catalogue of AGN In the XMM-Newton Archive. It consists
of all the radio-quiet X-ray unobscured ($\mathrm{N_H}<2\times10^{22}$
cm$^{-2}$) Active Galactic Nuclei (AGN) observed by XMM-Newton in targeted
observations, whose data are public as of March 2007. With its 156 sources,
this is the largest catalogue of high signal-to-noise X-ray spectra of AGN. All
the EPIC pn spectra of the sources in CAIXA were extracted homogeneously and a
baseline model was applied in order to derive their basic X-ray properties.
These data are complemented by multiwavelength data found in the literature:
Black Hole masses, Full Width Half Maximum (FWHM) of H$\beta$, radio and
optical fluxes. Here we describe our homogeneous spectral analysis of the X-ray
data in CAIXA and present all the results on the parameters adopted in our
best-fit models.


title: Sources of experimental errors in the observation of nanoscale magnetism

abstract:
  It has been recently reported that some non-magnetic materials in bulk state,
exhibit magnetic behavior at the nanscale due to surface and size effects. The
experimental observation of these effects is based on the measurement of very
small magnetic signals. Thus, some spurious effects that are not critical for
bulk materials with large magnetic signals may become important when measuring
small signals (typically below 0.0001 emu). Here, we summarize some sources of
these small magnetic signals that should be considered when studying this new
nanomagnetism


title: Renewed activity from the X-ray transient SAXJ 1810.8-2609 with INTEGRAL

abstract:
  We report on the results of INTEGRAL observations of the neutron star low
mass X-ray binary SAX J1810.8-2609 during its latest active phase in August
2007. The current outburst is the first one since 1998 and the derived
luminosity is 1.1-2.6x10^36 erg s-1 in the 20-100 keV energy range. This low
outburst luminosity and the long-term time-average accretion rate of
~5x10^-12Msolar/yr suggest that SAXJ 1810.8-2609 is a faint soft X-ray
transient. During the flux increase, spectra are consistent with a thermal
Comptonization model with a temperature plasma of ~23-30 keV and an optical
depth of ~1.2-1.5, independent from luminosity of the system. This is a typical
low hard spectral state for which the X-ray emission is attributed to the
upscattering of soft seed photons by a hot, optically thin electron plasma.
During the decay, spectra have a different shape, the high energy tail being
compatible with a single power law. This confirm similar behavior observed by
BeppoSAX during the previous outburst, with absence of visible cutoff in the
hard X-ray spectrum. INTEGRAL/JEM-X instrument observed four X-ray bursts in
Fall 2007. The first one has the highest peak flux (~3.5Crab in 3--25 keV)
giving an upper limit to the distance of the source of about 5.7 kpc, for a
LEdd~3.8x10^38 erg s^-1. The observed recurrence time of ~1.2 days and the
ratio of the total energy emitted in the persistent flux to that emitted in the
bursts (~73) allow us to conclude that the burst fuel was composed by mixed
hydrogen and helium with X>0.4.


title:
A Brief Review of the Singularities in 4D and 5D Viscous Cosmologies
  Near the Future Singularity

abstract:
  Analytic properties of physical quantities in the cosmic fluid such as energy
density \rho(t) and Hubble parameter H(t) are investigated near the future
singularity (Big Rip). Both 4D and 5D cosmologies are considered (the
Randall-Sundrum II model in the 5D case), and the fluid is assumed to possess a
bulk viscosity \zeta. We consider both Einstein gravity and modified gravity,
where in the latter case the Lagrangian contains a term R^\alpha with \alpha a
constant. If \zeta is proportional to the power (2\alpha-1) of the scalar
expansion, the fluid can pass from the quintessence region into the phantom
region as a consequence of the viscosity. A property worth noticing is that the
4D singularity on the brane becomes carried over to the bulk region.


title: The infinite partition of a line segment and multifractal objects

abstract:
  We report an algorithm for the partition of a line segment according to a
given ratio $\nu$. At each step the length distribution among sets of the
partition follows a binomial distribution. We call $k$-set to the set of
elements with the same length at the step $n$. The total number of elements is
$2^n$ and the number of elements in a same $k$-set is $C_n^k$. In the limit of
an infinite partion this object become a multifractal where each $k$-set
originate a fractal. We find the fractal spectrum $D_k$ and calculate where is
its maximum. Finally we find the values of $D_k$ for the limits $k/n \to 0$ and
1.


title:
Charge gap and ferroelastic lattice distortion in high-temperature
  superconductors

abstract:
  It is shown that a ferroelastic lattice distortion is associated with the
superconducting transition both in low- and high-temperature superconductors. A
low-temperature ferroelastic transition in crystalline solids produces also a
maximum in the temperature dependence of their thermal conductivity. In layered
tetragonal superconductors with a sufficiently high transition temperature, a
ferroelastic distortion is improper and is caused by an out-of-plane charge
ordering. The relation between the out-of-plane charge gap and the maximum
superconducting transition temperature for these superconductors is obtained.


title:
Hawking Radiation from a Vaidya Black Hole: A Semi-Classical Approach
  and Beyond

abstract:
  We derive the Hawking radiation for Vaidya black hole in the tunneling
picture from the corresponding single particle action by the use of the radial
null geodesic and the Hamilton-Jacobi method (beyond semi-classical
approximation). Both results are then analyzed and compared.


title: Exclusive diffractive final states in electron-proton collisions

abstract:
  The exclusive diffractive production of vector mesons and real photons in ep
collisions has been studied at HERA in a wide kinematic range. The most recent
experimental results are presented.


title: Eruption of magnetic flux ropes during flux emergence

abstract:
  Aims: We investigate the formation of flux ropes in a flux emergence region
and their rise into the outer atmosphere of the Sun.
  Methods: We perform 3D numerical experiments solving the time-dependent and
resistive MHD equations.
  Results: A sub-photospheric twisted flux tube rises from the solar interior
and expands into the corona. A flux rope is formed within the expanding field,
due to shearing and reconnection of field lines at low atmospheric heights. If
the tube emerges into a non-magnetized atmosphere, the flux rope rises, but
remains confined inside the expanding magnetized volume. On the contrary, if
the expanding tube is allowed to reconnect with a preexisting coronal field,
the flux rope experiences a full eruption with a rise profile which is in
qualitative agreement with erupting filaments and Coronal Mass Ejections.


title:
Isospin mixing of isospin-projected Slater determinants: formalism and
  preliminary applications

abstract:
  We report on the development of a new theoretical tool that allows for
isospin projection of Slater determinants and we present its first
applications. In particular, we determine the isospin mixing in ground states
of N=Z nuclei and discuss its dependence on the size of the harmonic-oscillator
basis used in the calculations. We also discuss the unphysical contribution to
the isospin mixing caused by the spurious isospin-symmetry breaking inherent to
the mean-field approach. We show that these contributions may be as large as
30% of the value of the isospin-mixing parameter.


title:
Bose-Einstein condensates in a double well: mean-field chaos and
  multi-particle entanglement

abstract:
  A recent publication [Phys. Rev. Lett. 100, 140408 (2008)] shows that there
is a relation between mean-field chaos and multi-particle entanglement for BECs
in a periodically shaken double well. 'Schrodinger-cat' like mesoscopic
superpositions in phase-space occur for conditions for which the system
displays mean-field chaos. In the present manuscript, more general
highly-entangled states are investigated. Mean-field chaos accelerates the
emergence of multi-particle entanglement; the boundaries of stable regions are
particularly suited for entanglement generation.


title: Future science issues for Galactic very-high-energy gamma-ray astronomy

abstract:
  This work intends to provide a brief summary of some of the Galactic science
issues for the next generation of very high energy (VHE) instruments. The
latter is here generically understood, as an instrument or set of instruments
providing about one order of magnitude more sensitivity at its central energy
(at about 1 TeV), but extending the observational window to have a real
broadband capability (from a few tens of GeV up to tens of TeV); exceeding at
low energies the current VHE threshold for observations set by MAGIC as well as
the few-tens-of-GeV sensitivity set by Fermi. Science topics regarding
populations of emitters, pulsars and their nebula, binaries, supernova
remnants, stars, and their associations, are discussed.


title: Input from opacity data in computation of pulsation instability

abstract:
  Several types of variable stars are found along the HR diagram whose
pulsations are driven by the $\kappa$-mechanism. Given their nature, the
precise ($T_{\rm eff}-L$) domain where these pulsators are located is highly
dependent on the value of opacity and on its variation inside the star. We
analyze the sensitivity of opacity driven pulsators of spectral-type A and B
($\delta$ Scuti, $\beta$ Cephei and SPB stars) to the opacity tables (OP/OPAL)
and to the chemical composition of the stellar matter. We also briefly discuss
the effect of opacity on pulsators whose oscillations are not driven by the
$\kappa$-mechanism, such as $\gamma$ Doradus and solar-like stars.


title: Global nuclear structure aspects of tensor interaction

abstract:
  A direct fit of the isoscalar spin-orbit and both isoscalar and isovector
tensor coupling constants to the f5/2-f7/2 SO splittings in 40Ca, 56Ni, and
48Ca requires: (i) a significant reduction of the standard isoscalar spin-orbit
strength and (ii) strong attractive tensor coupling constants. The aim of this
paper is to address the consequences of these strong attractive tensor and weak
spin-orbit fields on total binding energies, two-neutron separation energies
and nuclear deformability.


title:
Relationship between the atomic pair distribution function and small
  angle scattering: implications for modeling of nanoparticles

abstract:
  Here we show explicitly the relationship between the functions used in the
atomic pair distribution function (PDF) method and those commonly used in small
angle scattering (SAS) analyses. The origin of the sloping baseline, $-4\pi
r\rho_0$, in PDFs of bulk materials is identified as originating from the SAS
intensity that is neglected in PDF measurements. The non-linear baseline in
nanoparticles has the same origin, and contains information about the shape and
size of the nanoparticles.


title: Absolute absorption spectroscopy based on molecule interferometry

abstract:
  We propose a new method to measure the absolute photon absorption cross
section of neutral molecules in a molecular beam. It is independent of our
knowledge of the particle beam density, nor does it rely on photo-induced
fragmentation or ionization. The method is based on resolving the recoil
resulting from photon absorption by means of near-field matter-wave
interference, and it thus applies even to very dilute beams with low optical
densities. Our discussion includes the possibility of internal state conversion
as well as fluorescence. We assess the influence of various experimental
uncertainties and show that the measurement of absolute absorption cross
sections is conceivable with high precision and using existing technologies.


title: Correlated earthquakes in a self-organized model

abstract:
  Motivated by the fact that empirical time series of earthquakes exhibit
long-range correlations in space and time and the Gutenberg-Richter
distribution of magnitudes, we propose a simple fault model that can account
for these types of scale-invariance. It is an avalanching process that displays
power-laws in the event sizes, in the epicenter distances as well as in the
waiting-time distributions, and also aftershock rates obeying a generalized
Omori law. We thus confirm that there is a relation between temporal and
spatial clustering of the activity in this kind of models. The fluctuating
boundaries of possible slipping areas show that the size of the largest
possible earthquake is not always maximal, and the average correlation length
is a fraction of the system size. This suggests that there is a concrete
alternative to the extreme interpretation of self-organized criticality as a
process in which every small event can cascade to an arbitrary large one: the
new picture includes fluctuating domains of coherent stress field as part of
the global self-organization. Moreover, this picture can be more easily
compared with other scenarios discussing fluctuating correlations lengths in
seismicity.


title: Spectral evolution of superluminal components in parsec-scale jets

abstract:
  (Abridged) We present numerical simulations of the spectral evolution and
emission of radio components in relativistic jets. We have developed an
algorithm (SPEV) for the transport of a population of non-thermal electrons
including radiative losses. For large values of the ratio of gas pressure to
magnetic field energy density, \ab \sim 6\times 10^4, quiescent jet models show
substantial spectral evolution, with observational consequences only above
radio frequencies. Larger values of the magnetic field (\ab \sim 6\times 10^2),
such that synchrotron losses are moderately important at radio frequencies,
present a larger ratio of shocked-to-unshocked regions brightness than the
models without radiative losses, despite the fact that they correspond to the
same underlying hydrodynamic structure. We also show that jets with a positive
photon spectral index result if the lower limit \gamma_min of the non-thermal
particle energy distribution is large enough. A temporary increase of the
Lorentz factor at the jet inlet produces a traveling perturbation that appears
in the synthetic maps as a superluminal component. We show that trailing
components can be originated not only in pressure matched jets, but also in
over-pressured ones, where the existence of recollimation shocks does not allow
for a direct identification of such features as Kelvin-Helmholtz modes, and its
observational imprint depends on the observing frequency. If the magnetic field
is large (\ab \sim 6\times 10^2), the spectral index in the rarefaction
trailing the traveling perturbation does not change much with respect to the
same model without any hydrodynamic perturbation. If the synchrotron losses are
considered the spectral index displays a smaller value than in the
corresponding region of the quiescent jet model.


title: Particle trajectories and acceleration during 3D fan reconnection

abstract:
  Context. The primary energy release in solar flares is almost certainly due
to magnetic reconnection, making this a strong candidate as a mechanism for
particle acceleration. While particle acceleration in 2D geometries has been
widely studied, investigations in 3D are a recent development. Two main classes
of reconnection regimes at a 3D magnetic null point have been identified: fan
and spine reconnection Aims. Here we investigate particle trajectories and
acceleration during reconnection at a 3D null point, using a test particle
numerical code, and compare the efficiency of the fan and spine regimes in
generating an energetic particle population. Methods. We calculated the time
evolution of the energy spectra. We discuss the geometry of particle escape
from the two configurations and characterise the trapped and escaped
populations. Results. We find that fan reconnection is less efficent than spine
reconnection in providing seed particles to the region of strong electric field
where acceleration is possible. The establishment of a steady-state spectrum
requires approximately double the time in fan reconnection. The steady-state
energy spectrum at intermediate energies (protons 1 keV to 0.1 MeV) is
comparable in the fan and spine regimes. While in spine reconnection particle
escape takes place in two symmetric jets along the spine, in fan reconnection
no jets are produced and particles escape in the fan plane, in a ribbon-like
structure.


title: Non-LTE modeling of the near UV band of late-type stars

abstract:
  We investigate the ability of both LTE and Non-LTE models to fit the near UV
band absolute flux distribution and individual spectral line profiles of three
standard stars for which high quality spectrophotometry and high resolution
spectroscopy are available: The Sun (G2 V), Arcturus (K2 III), and Procyon (F5
IV-V). We investigate 1) the effect of the choice of atomic line list on the
ability of NLTE models to fit the near UV band flux level, 2) the amount of a
hypothesized continuous thermal absorption extinction source required to allow
NLTE models to fit the observations, and 3) the semi-empirical temperature
structure required to fit the observations with NLTE models and standard
continuous near UV extinction. We find that all models that are computed with
high quality atomic line lists predict too much flux in the near UV band for
Arcturus, but fit the warmer stars well. The variance among independent
measurements of the solar irradiance in the near UV is sufficiently large that
we cannot definitely conclude that models predict too much near UV flux, in
contrast to other recent results. We surmise that the inadequacy of current
atmospheric models of K giants in the near UV band is best addressed by
hypothesizing that there is still missing continuous thermal extinction, and
that the missing near UV extinction becomes more important with decreasing
effective temperature for spectral classes later than early G, suggesting a
molecular origin.


title:
Improved equations for eccentricity generation in hierarchical triple
  systems

abstract:
  In a series of papers, we developed a technique for estimating the inner
eccentricity in hierarchical triple systems, with the inner orbit being
initially circular. However, for certain combinations of the masses and the
orbital elements, the secular part of the solution failed. In the present
paper, we derive a new solution for the secular part of the inner eccentricity,
which corrects the previous weakness. The derivation applies to hierarchical
triple systems with coplanar and initially circular orbits. The new formula is
tested numerically by integrating the full equations of motion for systems with
mass ratios from 10^(-3) to 10^(3). We also present more numerical results for
short term eccentricity evolution, in order to get a better picture of the
behaviour of the inner eccentricity.


title:
Effect of 3d Transition Metal Doping on the Superconductivity in
  Quaternary Fluoroarsenide CaFeAsF

abstract:
  We examined doping effect of 3d transition metal elements (TM: Cr, Mn, Co,
Ni, and Cu) at the Fe site of a quaternary fluoroarsenide CaFeAsF, an analogue
of 1111-type parent compound LaFeAsO. The anomaly at ~120 K observed in
resistivity (rho) vs. temperature (T) plot for the parent compound is
suppressed by the doping of each TM element. Furthermore, Co- and Ni-doping
(CaFe1-xTMxAsF, TM = Co, Ni) induces superconductivity with a transition
temperature maximized at the nominal x = 0.10 for Co (22 K) and at x = 0.05 for
Ni (12 K). These optimal doping levels may be understood by considering that
Ni2+(3d8) adds double electrons to the FeAs layers compared with Co2+ (3d7).
Increased x for Co or Ni breaks the superconductivity while metallic nature
drho/dT > 0 is still kept. These observations indicate that Co and Ni work as
electron donors. In contrast, neither of Cr, Mn nor Cu-doping induce
superconductivity, yielding drho/dT < 0 in the below the rho-T anomaly
temperature, indicating that these transition metal ions act as scattering
centers. The two different behavior of TM replacing the Fe site is discussed in
relation to the changes in the lattice constants with the doping.


title: Strong correlation effects in single-wall carbon nanotubes

abstract:
  We present an overview of strong correlations in single-wall carbon
nanotubes, and an introduction to the techniques used to study them
theoretically. We concentrate on zigzag nanotubes, although universality
dictates that much ofthe theory can also be applied to armchair or chiral
nanotubes. We show how interaction effects lead to exotic low energy properties
and discuss future directions for studies on correlation effects in nanotubes.


title: On the limit of large girth graph sequences

abstract:
  We prove that any involution-invariant probability measure on the space of
trees with maximum degrees at most d arises as the local limit of a convergent
large girth graph sequence. This answers a question of Bollobas and Riordan.


title:
Moving Finite Size Particles in a Flow: A Physical Example for Pitchfork
  Bifurcations of Tori

abstract:
  The motion of small, spherical particles of finite size in fluid flows at low
Reynolds numbers is described by the strongly nonlinear Maxey-Riley equations.
Due to the Stokes drag the particle motion is dissipative, giving rise to the
possibility of attractors in phase space. We investigate the case of an
infinite, cellular flow field with time-periodic forcing. The dynamics of this
system are studied in a part of the parameter space. We focus particularly on
the size of the particles whose variations are most important in active,
physical processes, for example for aggregation and fragmentation of particles.
Depending on their size the particles will settle on different attractors in
phase space in the long term limit, corresponding to periodic, quasiperiodic or
chaotic motion. One of the invariant sets that can be observed in a large part
of this parameter region is a quasiperiodic motion in form of a torus. We
identify some of the bifurcations that these tori undergo, as particle size and
mass ratio relative to the fluid are varied. This way we provide a physical
example for sub- and supercritical pitchfork bifurcations of tori.


title: A Model for Probabilistic Reasoning on Assume/Guarantee Contracts

abstract:
  In this paper, we present a probabilistic adaptation of an Assume/Guarantee
contract formalism. For the sake of generality, we assume that the extended
state machines used in the contracts and implementations define sets of runs on
a given set of variables, that compose by intersection over the common
variables. In order to enable probabilistic reasoning, we consider that the
contracts dictate how certain input variables will behave, being either
non-deterministic, or probabilistic; the introduction of probabilistic
variables leading us to tune the notions of implementation, refinement and
composition. As shown in the report, this probabilistic adaptation of the
Assume/Guarantee contract theory preserves compositionality and therefore
allows modular reliability analysis, either with a top-down or a bottom-up
approach.


title:
Long-time existence for semi-linear Klein-Gordon equations with
  quadratic potential

abstract:
  We prove that small smooth solutions of semi-linear Klein-Gordon equations
with quadratic potential exist over a longer interval than the one given by
local existence theory, for almost every value of mass. We use normal form for
the Sobolev energy. The difficulty in comparison with some similar results on
the sphere comes from the fact that two successive eigenvalues $\lambda,
\lambda'$ of $\sqrt{-\Delta+|x|^2}$ may be separated by a distance as small as
$\frac{1}{\sqrt{\lambda}}$.


title:
Stein estimation for the drift of Gaussian processes using the Malliavin
  calculus

abstract:
  We consider the nonparametric functional estimation of the drift of a
Gaussian process via minimax and Bayes estimators. In this context, we
construct superefficient estimators of Stein type for such drifts using the
Malliavin integration by parts formula and superharmonic functionals on
Gaussian space. Our results are illustrated by numerical simulations and extend
the construction of James--Stein type estimators for Gaussian processes by
Berger and Wolpert [J. Multivariate Anal. 13 (1983) 401--424].


title: The Chinese-French SVOM mission for Gamma-Ray Burst studies

abstract:
  We present the Space-based multi-band astronomical Variable Objects Monitor
mission (SVOM) decided by the Chinese National Space Agency (CNSA) and the
French Space Agency (CNES). The mission which is designed to detect about 80
Gamma-Ray Bursts (GRBs) of all known types per year, will carry a very
innovative scientific payload combining a gamma-ray coded mask imagers
sensitive in the range 4 keV to 250 keV, a soft X-ray telescope operating
between 0.5 to 2 keV, a gamma-ray spectro-photometer sensitive in the range 50
keV to 5 MeV, and an optical telescope able to measure the GRB afterglow
emission down to a magnitude limit M$_R=23$ with a 300 s exposure. A particular
attention will be also paid to the follow-up in making easy the observation of
the SVOM detected GRB by the largest ground based telescopes.
  Scheduled for a launch in 2013, it will provide fast and reliable GRB
positions, will measure the broadband spectral energy distribution and temporal
properties of the prompt emission, and will quickly identify the optical
afterglows of detected GRBs, including those at very high redshift.


title:
Mesoscopic Rydberg Gate based on Electromagnetically Induced
  Transparency

abstract:
  We demonstrate theoretically a parallelized C-NOT gate which allows to
entangle a mesoscopic ensemble of atoms with a single control atom in a single
step, with high fidelity and on a microsecond timescale. Our scheme relies on
the strong and long-ranged interaction between Rydberg atoms triggering
Electromagnetically Induced Transparency (EIT). By this we can robustly
implement a conditional transfer of all ensemble atoms among two logical
states, depending on the state of the control atom. We outline a many body
interferometer which allows a comparison of two many-body quantum states by
performing a measurement of the control atom.


title:
Spinor Dynamics of Quantum Accelerator Modes near Higher Order
  Resonances

abstract:
  Quantum Accelerator Modes were discovered in experiments with Kicked Cold
Atoms in the presence of gravity. They were shown to be tightly related to
resonances of the Quantum Kicked Rotor. In this paper a spinor formalism is
developed for the analysis of Modes associatedwith resonances of arbitrary
order q>1. Decoupling of spin variables from orbital ones is achieved by means
of an ansatz of the Born-Oppenheimer type, that generates q independent band
dynamics. Each of these is described, in classical terms, by a map, and the
stable periodic orbits of this map give rise to quantum accelerator modes,
which are potentially observable in experiments. The arithmetic organization of
such periodic orbits is briefly discussed.


title: The skew-torsion holonomy theorem and naturally reductive spaces

abstract:
  We prove a Simons-type holonomy theorem for totally skew 1-forms with values
in a Lie algebra of linear isometries. The only transitive case, for this
theorem, is the full orthogonal group. We only use geometric methods and we do
not use any classification (not even that of transitive isometric actions on
the sphere or the list of rank one symmetric spaces). This result was
independently proved, by using an algebraic approach, by Paul-Andy Nagy. We
apply this theorem to prove that the canonical connection of a compact
naturally reductive space is unique, provided the space does not split off,
locally, a sphere or a compact Lie group with a bi-invariant metric. From this
it follows easily how to obtain the full isometry group of a naturally
reductive space. This generalizes known classification results of Onishchick,
for normal homogeneous spaces with simple group of isometries, and Shankar, for
homogeneous spaces of positive curvature. This also answers a question posed by
J. Wolf and Wang-Ziller. Namely, to explain why the presentation group of an
isotropy irreducible space, strongly or not, cannot be enlarged (unless for
spheres, or for compact simple Lie groups with a bi-invariant metric).


title: Effect of Modified Dispersion Relations on Immirzi Parameter

abstract:
  Black hole entropy calculations which are based on counting of microstates
and based on modified dispersion relations in the framework of loop quantum
gravity are considered. We suggest that the inconsistency of two approaches can
be explained by different ways. This inconsistency can affect the definition
and constancy of the Immirzi parameter or order of the modification constants
of dispersion relations. Possible results of these effects are discussed.


title: Thermodynamic Measurements in a Strongly Interacting Fermi Gas

abstract:
  We conduct a series of measurements on the thermodynamic properties of an
optically-trapped strongly interacting Fermi gas, including the energy $E$,
entropy $S$, and sound velocity $c$. Our model-independent measurements of $E$
and $S$ enable a precision study of the finite temperature thermodynamics. The
$E(S)$ data are directly compared to several recent predictions. The
temperature in both the superfluid and normal fluid regime is obtained from the
fundamental thermodynamic relation $T=\partial E/\partial S$ by parameterizing
the $E(S)$ data. Our $E(S)$ data are also used to experimentally calibrate the
endpoint temperatures obtained for adiabatic sweeps of the magnetic field
between the ideal and strongly interacting regimes. This enables the first
experimental calibration of the temperature scale used in experiments on
fermionic pair condensation. Our calibration shows that the ideal gas
temperature measured for the onset of pair condensation corresponds closely to
the critical temperature estimated in the strongly interacting regime from the
fits to our $E(S)$ data. The results are in very good agreement with recent
predictions. Finally, using universal thermodynamic relations, we estimate the
chemical potential and heat capacity of the trapped gas from the $E(S)$ data.


title: Ultra High Energy Cosmic Rays from Black Hole Jets of Radio Galaxies

abstract:
  The Auger Collaboration reports that the arrival directions of >60 EeV
ultra-high energy cosmic rays (UHECRs) cluster along the supergalactic plane
and correlate with active galactic nuclei (AGN) within ~100 Mpc. The
association of several events with the nearby radio galaxy Centaurus A supports
the paradigm that UHECRs are powered by supermassive black-hole engines and
accelerated to ultra-high energies in the shocks formed by variable plasma
winds in the inner jets of radio galaxies. The GZK horizon length of 75 EeV
UHECR protons is ~100 Mpc, so that the Auger results are consistent with an
assumed proton composition of the UHECRs. In this scenario, the sources of
UHECRs are FR II radio galaxies and FR I galaxies like Cen A with scattered
radiation fields that enhance UHECR neutral-beam production. Radio galaxies
with jets pointed away from us can still be observed as UHECR sources due to
deflection of UHECRs by magnetic fields in the radio lobes of these galaxies. A
broadband ~1 MeV -- 10 EeV radiation component in the spectra of blazar AGN is
formed by UHECR-induced cascade radiation in the extragalactic background light
(EBL). This emission is too faint to be seen from Cen A, but could be detected
from more luminous blazars.


title:
Experimental study of vapor-cell magneto-optical traps for efficient
  trapping of radioactive atoms

abstract:
  We have studied magneto-optical traps (MOTs) for efficient on-line trapping
of radioactive atoms. After discussing a model of the trapping process in a
vapor cell and its efficiency, we present the results of detailed experimental
studies on Rb MOTs. Three spherical cells of different sizes were used. These
cells can be easily replaced, while keeping the rest of the apparatus
unchanged: atomic sources, vacuum conditions, magnetic field gradients, sizes
and power of the laser beams, detection system. By direct comparison, we find
that the trapping efficiency only weakly depends on the MOT cell size. It is
also found that the trapping efficiency of the MOT with the smallest cell,
whose diameter is equal to the diameter of the trapping beams, is about 40%
smaller than the efficiency of larger cells. Furthermore, we also demonstrate
the importance of two factors: a long coated tube at the entrance of the MOT
cell, used instead of a diaphragm; and the passivation with an alkali vapor of
the coating on the cell walls, in order to minimize the losses of trappable
atoms. These results guided us in the construction of an efficient
large-diameter cell, which has been successfully employed for on-line trapping
of Fr isotopes at INFN's national laboratories in Legnaro, Italy.


title: Parameters of the fractional Fokker-Planck equation

abstract:
  We study the connection between the parameters of the fractional
Fokker-Planck equation, which is associated with the overdamped Langevin
equation driven by noise with heavy-tailed increments, and the transition
probability density of the noise generating process. Explicit expressions for
these parameters are derived both for finite and infinite variance of the
rescaled transition probability density.


title: Compact extra-dimensions as solution to the strong CP problem

abstract:
  We show that the strong CP problem can, in principle, be solved dynamically
by adding extra-dimensions with compact topology. To this aim we consider a toy
model for QCD, which contains a vacuum angle and a strong CP like problem. We
further consider a higher dimensional theory, which has a trivial vacuum
structure and which reproduces the perturbative properties of the toy model in
the low-energy limit. In the weak coupling regime, where our computations are
valid, we show that the vacuum structure of the low-energy action is still
trivial and the strong CP problem is solved. No axion-like particle occur in
this setup and therefore it is not ruled out by astrophysical bounds.


title: Near Infrared Spectroscopic Monitoring of EXor variables: First Results

abstract:
  We present low resolution (R approximately 250) spectroscopy in the near-IR
(0.8 to 2.5um) of the EXor variables. These are the initial results (obtained
during the period 2007-2008) from a long term photometric and spectroscopic
program aimed to study the variability in the accretion processes of pre-Main
Sequence (PMS) stars, by correlating the continuum fluctuations with the
spectroscopical properties. Eight sources have been observed in different
epochs, for a total of 25 acquired spectra. EXor spectra show a wide variety of
emission features dominated by HI recombination (Paschen and Brackett series).
We have investigated whether line and continuum variability could be due to a
variable extinction, but such hypothesis is applicable only to the peculiar
source PV Cep. By comparing the observed spectra with a wind model, mass loss
rates in the range (2-10)x10^(-8) M_sun} yr^(-1) are derived, along with other
wind parameters. Consistent results are also obtained by assuming that HI lines
are due to accretion. CO overtone is also detected in the majority of the
sources both in absorption and in emission. It appears to come from regions
more compact than winds, likely the stellar photosphere (when in absorption)
and the circumstellar disk (when in emission). NaI and CaI IR lines behave as
the CO does, thus they are thought to arise in the same locations. For some
targets multiple spectra correspond to different activity stages of the source.
Those exhibiting the largest continuum variation at 2um (DeltaK > 1 mag)
present a significant line flux fading during the continuum declining phases.
In particular, CO absorption (emission) appears associated to inactive (active)
stages, respectively.


title: On $D$-spaces and Discrete Families of Sets

abstract:
  We prove several reflection theorems on $D$-spaces, which are Hausdorff
topological spaces $X$ in which for every open neighbourhood assignment $U$
there is a closed discrete subspace $D$ such that \[ \bigcup\{U(x): x\in D\}=X.
\] The upwards reflection theorems are obtained in the presence of a forcing
axiom, while most of the downwards reflection results use large cardinal
assumptions.
  The combinatorial content of arguments showing that a given space is a
$D$-space, can be formulated using the concept of discrete families. We note
the connection between non-reflection arguments involving discrete families and
the well known question of the existence of families allowing partial
transversals without having a transversal themselves, and use it to give
non-trivial instances of the incompactness phenomenon in the context of
discretisations.


title:
The ground state energy of the weakly interacting Bose gas at high
  density

abstract:
  We prove the Lee-Huang-Yang formula for the ground state energy of the 3D
Bose gas with repulsive interactions described by the exponential function, in
a simultaneous limit of weak coupling and high density. In particular, we show
that the Bogoliubov approximation is exact in an appropriate parameter regime,
as far as the ground state energy is concerned.


title:
Localized heating in nanoscale Pt constrictions measured using blackbody
  radiation emission

abstract:
  Using thermal emission microscopy, we investigate heating in Pt nanowires
before and during electromigration. The wires are observed to reach
temperatures in excess of 1000 K. This is beyond the thermal decomposition
threshold for many organic molecules of interest for single molecule
measurements with electromigrated nanogaps. Blackbody spectra of the hot Pt
wires are measured and found to agree well with finite element modeling
simulations of the electrical and thermal transport.


title: A Simpson correspondence in positive characteristic

abstract:
  We define the $p^m$-curvature map on the sheaf of differential operators of
level $m$ on a scheme of positive characteristic $p$ as dual to some divided
power map on infinitesimal neighborhhods. This leads to the notion of
$p^m$-curvature on differential modules of level $m$. We use this construction
to recover Kaneda's description of a semi-linear Azumaya splitting of the sheaf
of differential operators of level $m$. Then, using a lifting modulo $p^2$ of
Frobenius, we are able to define a Frobenius map on differential operators of
level $m$ as dual to some divided Frobenius on infinitesimal neighborhhods. We
use this map to build a true Azumaya splitting of the completed sheaf of
differential operators of level $m$ (up to an automorphism of the center). From
this, we derive the fact that Frobenius pull back gives, when restricted to
quasi-nilpotent objects, an equivalence between Higgs-modules and differential
modules of level $m$. We end by explaining the relation with related work of
Ogus-Vologodski and van der Put in level zero as well as Berthelot's Frobenius
descent.


title:
Rate of convergence to self-similarity for Smoluchowski's coagulation
  equation with constant coefficients

abstract:
  We show that solutions to Smoluchowski's equation with a constant coagulation
kernel and an initial datum with some regularity and exponentially decaying
tail converge exponentially fast to a self-similar profile. This convergence
holds in a weighted Sobolev norm which implies the L\^2 convergence of
derivatives up to a certain order k depending on the regularity of the initial
condition. We prove these results through the study of the linearized
coagulation equation in self-similar variables, for which we show a spectral
gap in a scale of weighted Sobolev spaces. We also take advantage of the fact
that the Laplace or Fourier transforms of this equation can be explicitly
solved in this case.


title: Phi-modules and coefficient spaces

abstract:
  We define and study certain moduli stacks of modules equipped with a
Frobenius semi-linear endomorphism. These stacks can be thought of as
parametrizing the coefficients of a variable Galois representation and are
global variants of the spaces of Kisin-Breuil $\Phi$-modules used by Kisin in
his study of deformation spaces of local Galois representations. We also define
a version of a rigid analytic period map for these spaces, we show how their
local structure can be described in terms of "local models", and we show how
Bruhat-Tits buildings can be used to study their special fibers.


title:
Sensitivity of a Barotropic Ocean Model to Perturbations of the Bottom
  Topography

abstract:
  In this paper, we look for an operator that describes the relationship
between small errors in representation of the bottom topography in a barotropic
ocean model and the model's solution. The study shows that the model's solution
is very sensitive to topography perturbations in regions where the flow is
turbulent. On the other hand, the flow exhibits low sensitivity in laminar
regions. The quantitative measure of sensitivity is influenced essentially by
the error growing time. At short time scales, the sensitivity exhibits the
polynomial dependence on the error growing time. And in the long time limit,
the dependence becomes exponential.


title:
An algorithm to obtain global solutions of the double confluent Heun
  equation

abstract:
  A procedure is proposed to construct solutions of the double confluent Heun
equation with a determinate behaviour at the singular points. The connection
factors are expressed as quotients of Wronskians of the involved solutions.
Asymptotic expansions are used in the computation of those Wronskians. The
feasibility of the method is shown in an example, namely, the Schroedinger
equation with a quasi-exactly-solvable potential.


title: On the centralizer of diffeomorphisms of the half-line

abstract:
  Let f be a smooth diffeomorphism of the half-line fixing only the origin and
Z^r its centralizer in the group of C^r diffeomorphisms. According to
well-known results of Szekeres and Kopell, Z^1 is a one-parameter group. On the
other hand, Sergeraert constructed an f whose centralizer Z^r, $2\le r\le
\infty$, reduces to the group generated by f. We show that Z^r can actually be
a proper dense and uncountable subgroup of Z^1 and that this phenomenon is not
scarce.


title: Quenching of Star Formation

abstract:
  In the last decade we have seen an enormous increase in the size and quality
of spectroscopic galaxy surveys, both at low and high redshift. New statistical
techniques to analyse large portions of galaxy spectra are now finding favour
over traditional index based methods. Here we will review a new robust and
iterative Principal Component Analysis (PCA) algorithm, which solves several
common issues with classic PCA. Application to the 4000AA break region of
galaxies in the VIMOS VLT Deep Survey (VVDS) and Sloan Digital Sky Survey
(SDSS) gives new high signal-to-noise ratio spectral indices easily
interpretable in terms of recent star formation history. In particular, we
identify a sample of post-starburst galaxies at z~0.7 and z~0.07. We quantify
for the first time the importance of post-starburst galaxies, consistent with
being descendants of gas-rich major mergers, for building the red sequence.
Finally, we present a comparison with new low and high redshift "mock
spectroscopic surveys" derived from a Millennium Run semi-analytic model.


title: Long baseline neutrino oscillations: Theoretical aspects

abstract:
  We discuss the measurement of the neutrino oscillation parameters at future
long baseline experiments in terms of the motivation of the experiments, the
quantities of interest from the theoretical point of view, the phenomenology of
these experiments, and the experiment choice. We illustrate the oscillation
physics potential of a neutrino factory, as a representative for the most
challenging technologies. Finally, we point out that a future neutrino
oscillation facility might also be affected by the unexpected.


title:
Orion's Bar: Physical Conditions across the Definitive H+ / H0 / H2
  Interface

abstract:
  Previous work has shown the Orion Bar to be an interface between ionized and
molecular gas, viewed roughly edge on, which is excited by the light from the
Trapezium cluster. Much of the emission from any star-forming region will
originate from such interfaces, so the Bar serves as a foundation test of any
emission model. Here we combine X-ray, optical, IR and radio data sets to
derive emission spectra along the transition from H+ to H0 to H2 regions. We
then reproduce the spectra of these layers with a simulation that
simultaneously accounts for the detailed microphysics of the gas, the grains,
and molecules, especially H2 and CO. The magnetic field, observed to be the
dominant pressure in another region of the Orion Nebula, is treated as a free
parameter, along with the density of cosmic rays. Our model successfully
accounts for the optical, IR and radio observations across the Bar by including
a significant magnetic pressure and also heating by an excess density of cosmic
rays, which we suggest is due to cosmic rays being trapped in the compressed
magnetic field. In the Orion Bar, as we had previously found in M17, momentum
carried by radiation and winds from the newly formed stars pushes back and
compresses the surrounding gas. There is a rough balance between outward
momentum in starlight and the total pressure in atomic and molecular gas
surrounding the H+ region. If the gas starts out with a weak magnetic field,
the starlight from a newly formed cluster will push back the gas and compress
the gas, magnetic field, and cosmic rays until magnetic pressure becomes an
important factor.


title:
Stochastic self-similarity of envelopes of high-frequency teleseismic
  P-waves from large earthquakes suggests fractal pattern for earthquake
  rupture

abstract:
  High-frequency (HF) seismic radiation of large earthquakes is approximately
represented by P wave trains recorded at teleseismic distances. Observed
envelopes of such signals look random and intermittent, suggesting non-trivial
stochastic structure. Variogram and spectral analyses were applied to instant
power calculated from band-filtered observed P-wave signals from eight large
(Mw=7.6-9.2) earthquakes, with 8-30 records per event and eight
non-overvlapping frequency bands analyzed (total frequency range 0.6-6.2 Hz,
bandwidth 0.7 Hz). Estimates for both variograms and power spectra look linear
in log-log scale, suggesting in most cases self-similar correlation structure
of the signal. The range for the individual-event values of the Hurst exponent
H is 0.71-0.80 (averaged over bands and stations) when estimated from
variograms, and 0.78-0.83 when estimated from spectra. No systematic dependence
on station or frequency band was noticed. The values of H around 0.8 may be
characteristic for large earthquakes in general. The result suggests that the
space-time organization of earthquake rupture process has significant fractal
features. Also, a useful constraint is established for application-oriented
earthquake strong motion modeling.


title: Emergent Continuum Spacetime from a Random, Discrete, Partial Order

abstract:
  There are several indications (from different approaches) that Spacetime at
the Plank Scale could be discrete. One approach to Quantum Gravity that takes
this most seriously is the Causal Sets Approach. In this approach spacetime is
fundamentally a discrete, random, partially ordered set (where the partial
order is the causal relation). In this contribution, we examine how timelike
and spacelike distances arise from a causal set (in the case that the causal
set is approximated by Minkowski spacetime), and how one can use this to obtain
geometrical information (such as lengths of curves) for the general case, where
the causal set could be approximated by some curved spacetime.


title: Universal functions and exactly solvable chaotic systems

abstract:
  A universal differential equation is a nontrivial differential equation the
solutions of which approximate to arbitrary accuracy any continuous function on
any interval of the real line. On the other hand, there has been much interest
in exactly solvable chaotic maps. An important problem is to generalize these
results to continuous systems.
  Theoretical analysis would allow us to prove theorems about these systems and
predict new phenomena. In the present paper we discuss the concept of universal
functions and their relevance to the theory of universal differential
equations. We present a connection between universal functions and solutions to
chaotic systems. We will show the statistical independence between $X(t)$ and
$X(t + \tau)$ (when $\tau$ is not equal to zero) and $X(t)$ is a solution to
some chaotic systems. We will construct universal functions that behave as
delta-correlated noise. We will construct universal dynamical systems with
truly noisy solutions. We will discuss physically realizable dynamical systems
with universal-like properties.


title:
Hanle effect in the solar Ba II D2 line: a diagnostic tool for
  chromospheric weak magnetic fields

abstract:
  The physics of the solar chromosphere depends in a crucial way on its
magnetic structure. However there are presently very few direct magnetic field
diagnostics available for this region. Here we investigate the diagnostic
potential of the Hanle effect on the Ba II D2 line resonance polarization for
the determination of weak chromospheric turbulent magnetic fields......


title: The Shape of Mesons in Holographic QCD

abstract:
  Based on the expectation that constituent quark model may capture right
physics in the large N limit, we point out that orbital angular momentum of the
quark-antiquark pair inside light mesons of low spins in the constituent quark
model may provide a clue for the holographic dual string model of large N QCD.
Our discussion, relying on a few suggestive assumptions, leads to a necessity
of world-sheet fermions in the bulk of dual strings that can incorporate
intrinsic spins of fundamental QCD degrees of freedom. We also comment on an
interesting issue of the size of mesons in the context of holographic QCD.


title: Modelling the transition from a socialist to capitalist economic system

abstract:
  The transition of several East and Central European countries and the
countries of the Former Soviet Union from the socialist economic system to the
capitalist one is studied. A recently developed microeconomic model for the
personal income distribution and its evolution and a simple functional
relationship between the rate of the per capita GDP growth and the attained
level of the per capita GDP are used to describe the transition process. The
developed transition model contains only three defining parameters and
describes the process of real GDP per capita evolution during the last 15
years. It is found that the transition process finished in the Central European
countries several years ago and their economic evolution is defined by pure
capitalist rules. In the long run, this means that the future of these
countries has to follow the same path, i.e. dependence on the per capita GDP
growth rate of the per capita GDP itself, as the developed countries have had
in the past. If the best GDP evolution scenario occurs for the studied
countries, they will be able to maintain the absolute lag in per capita GDP
relative to most developed countries including the USA. But they will never
catch the advanced countries if they follow the same rules of development. In
Russia and some countries of the Former Soviet Union the transition process is
still far from complete.


title:
Fractal properties of isolines at varying altitude reveal different
  dominant geological processes on Earth

abstract:
  Geometrical properties of landscapes result from the geological processes
that have acted through time. The quantitative analysis of natural relief
represents an objective form of aiding in the visual interpretation of
landscapes, as studies on coastlines, river networks, and global topography,
have shown. Still, an open question is whether a clear relationship between the
quantitative properties of landscapes and the dominant geomorphologic processes
that originate them can be established. In this contribution, we show that the
geometry of topographic isolines is an appropriate observable to help
disentangle such a relationship. A fractal analysis of terrestrial isolines
yields a clear identification of trenches and abyssal plains, differentiates
oceanic ridges from continental slopes and platforms, localizes coastlines and
river systems, and isolates areas at high elevation (or latitude) subjected to
the erosive action of ice. The study of the geometrical properties of the lunar
landscape supports the existence of a correspondence between principal
geomorphic processes and landforms. Our analysis can be easily applied to other
planetary bodies.