title: Decision problems and profinite completions of groups

abstract:
  We consider pairs of finitely presented, residually finite groups
$P\hookrightarrow\G$ for which the induced map of profinite completions $\hat
P\to \hat\G$ is an isomorphism. We prove that there is no algorithm that, given
an arbitrary such pair, can determine whether or not $P$ is isomorphic to $\G$.
We construct pairs for which the conjugacy problem in $\G$ can be solved in
quadratic time but the conjugacy problem in $P$ is unsolvable.
  Let $\mathcal J$ be the class of super-perfect groups that have a compact
classifying space and no proper subgroups of finite index. We prove that there
does not exist an algorithm that, given a finite presentation of a group $\G$
and a guarantee that $\G\in\mathcal J$, can determine whether or not
$\G\cong\{1\}$.
  We construct a finitely presented acyclic group $\H$ and an integer $k$ such
that there is no algorithm that can determine which $k$-generator subgroups of
$\H$ are perfect.


title: Star formation in the central 0.5 pc of the Milky Way

abstract:
  The supermassive black hole candidate at the Galactic Center is surrounded by
a parsec-scale star cluster, which contains a number of early type stars. The
presence of such stars has been called a "paradox of youth" as star formation
in the immediate vicinity of a supermassive black hole seemed difficult, as
well as the transport of stars from far out in a massive-star lifetime. I will
recall 30 years of technological developments which led to the current
understanding of the nuclear cluster stellar population. The number of early
type stars known at present is sufficient to access the 3D structure of this
population and its dynamics, which in turn allows discriminating between the
various possible origins proposed along the years.


title: Passage-time moments and hybrid zones for the exclusion-voter model

abstract:
  We study the non-equilibrium dynamics of a one-dimensional interacting
particle system that is a mixture of the voter model and the exclusion process.
With the process started from a finite perturbation of the ground state
Heaviside configuration consisting of 1's to the left of the origin and 0's
elsewhere, we study the relaxation time $\tau$, that is, the first hitting time
of the ground state configuration (up to translation). We give conditions for
$\tau$ to be finite and for certain moments of $\tau$ to be finite or infinite,
and prove a result that approaches a conjecture of Belitsky et al. (Bernoulli 7
(2001) 119--144). Ours are the first non-existence-of-moments results for
$\tau$ for the mixture model. Moreover, we give almost sure asymptotics for the
evolution of the size of the hybrid (disordered) region. Most of our results
pertain to the discrete-time setting, but several transfer to continuous-time.
As well as the mixture process, some of our results also cover pure exclusion.
We state several significant open problems.


title:
Direct Simulation of Low-Pressure Supersonic Gas Expansions and its
  Experimental Verification

abstract:
  The use of gas expansions to generate atomic or molecular beams has become a
standard technique in nuclear and hadron physics for the production of
polarized ion beams and gas targets. A direct simulation Monte Carlo method was
used to understand the processes occurring in an expansion of highly
dissociated hydrogen or deuterium gas at low densities. The results were
verified in several measurements including time-of-flight and beam-profile
determinations which showed that the supersonic gas expansions can properly be
described by the Monte Carlo calculations. Additionally a new method of beam
formation, the hollow carrier jet, was tested under the conditions of the
atomic beam source operation.


title: Mobility Management Framework

abstract:
  This paper investigates mobility management strategies from the point of view
of their need of signalling and processing resources on the backbone network
and load on the air interface. A method is proposed to model the serving
network and mobile node mobility in order to be able to compare the different
types of mobility management algorithms. To obtain a good description of the
network we calculate descriptive parameters from given topologies. Most
mobility approaches derived from existing protocols are analyzed and their
performances are numerically compared in various network and mobility
scenarios. We developed a mobility management framework that is able to give
general designing guidelines for the next generation mobility managements on
given network, technology and mobility properties. With our model an operator
can design the network and tune the parameters to obtain the optimal
implementation of course revising existing systems is also possible. We present
a vertical handover decision method as a special application of our model
framework.


title: Measurements of multijet production at low-x

abstract:
  Recent measurements of multijet production in neutral current deep inelastic
ep scattering at HERA are presented. Emphasis is put on parton dynamics at low
x.


title: On a symmetric space attached to polyzeta values

abstract:
  Quickly convergent series are given to compute polyzeta numbers. The formula
involves an intricate combination of (generalized) polylogarithms at 1/2.
However, the combinatorics has a very simple geometric interpretation: it
corresponds with the square map on some symmetric space P.


title: Hopping dynamics of interacting polarons

abstract:
  We derive an effective cluster model to address the transport properties of
mutually interacting small polarons. We propose a decoupling scheme where the
hopping dynamics of any given particle is determined by separating out
explicitly the degrees of freedom of its environment, which are treated as a
statistical bath. The general cavity method developed here shows that the
long-range Coulomb repulsion between the carriers leads to a net increase of
the thermal activation barrier for electrical transport, and hence to a sizable
reduction of the carrier mobility. A mean-field calculation of this effect is
provided, based on the known correlation functions of the interacting liquid in
two and three dimensions. The present theory gives a natural explanation of
recent experiments performed in organic field-effect transistors with highly
polarizable gate dielectrics, and might well find application in other classes
of polaronic systems such as doped transition-metal oxides.


title: Quantum $\mathrm{SO}(3)$ groups and quantum group actions on $M_2$

abstract:
  Answering a question of Shuzhou Wang we give a description of quantum
$\SO(3)$ groups of Podle\'s as universal objects. We use this result to give a
complete classification of all continuous compact quantum group actions on
$M_2$.


title: Direct factors of profinite completions and decidability

abstract:
  We consider finitely presented,residually finite groups $G$ and finitely
generated normal subgroups $A$ such that the inclusion $A\hookrightarrow G$
induces an isomorphism from the profinite completion of $A$ to a direct factor
of the profinite completion of $G$. We explain why $A$ need not be a direct
factor of a subgroup of finite index in $G$; indeed $G$ need not have a
subgroup of finite index that splits as a non-trivial direct product. We prove
that there is no algorithm that can determine whether $A$ is a direct factor of
a subgroup of finite index in $G$.


title:
Strongly interacting Fermi systems in 1/N expansion: From cold atoms to
  color superconductivity

abstract:
  We investigate the 1/N expansion proposed recently as a strategy to include
quantum fluctuation effects in the nonrelativistic, attractive Fermi gas at and
near unitarity. We extend the previous results by calculating the
next-to-leading order corrections to the critical temperature along the whole
BCS-BEC crossover. We demonstrate explicitly that the extrapolation from the
mean-field approximation, based on the $1/N$ expansion, provides a useful
approximation scheme only on the BCS side of the crossover. We then apply the
technique to the study of strongly interacting relativistic many-fermion
systems. Having in mind the application to color superconductivity in cold
dense quark matter, we develop, within a simple model, a formalism suitable to
compare the effects of order parameter fluctuations in phases with different
pairing patterns. Our main conclusion is that the relative correction to the
critical temperature is to a good accuracy proportional to the mean-field ratio
of the critical temperature and the chemical potential. As a consequence, it is
significant even rather deep in the BCS regime, where phenomenologically
interesting values of the quark-quark coupling are expected. Possible impact on
the phase diagram of color-superconducting quark matter is discussed.


title: A planetary nebula around nova V458 Vul undergoing flash ionization

abstract:
  Nova V458 Vul erupted on 2007 August 8th and reached a visual magnitude of
8.1 a few days later. H$\alpha$ images obtained six weeks before the outburst
as part of the IPHAS galactic plane survey reveal an 18th magnitude progenitor
surrounded by an extended nebula. Subsequent images and spectroscopy of the
nebula reveal an inner nebular knot increasing rapidly in brightness due to
flash ionization by the nova event. We derive a distance of 13 kpc based on
light travel time considerations, which is supported by two other distance
estimation methods. The nebula has an ionized mass of 0.2 M$_{\odot}$ and a low
expansion velocity: this rules it out as ejecta from a previous nova eruption,
and is consistent with it being a ~14,000 year old planetary nebula, probably
the product of a prior common envelope (CE) phase of evolution of the binary
system. The large derived distance means that the mass of the erupting WD
component of the binary is high. We identify two possible evolutionary
scenarios, in at least one of which the system is massive enough to produce a
Type Ia supernova on merging.


title: Revisiting Static and Dynamic Spin Ice Correlations in Ho2Ti2O7

abstract:
  Elastic and inelastic neutron scattering studies have been carried out on the
pyrochlore magnet Ho2Ti2O7. Measurements in zero applied magnetic field show
that the disordered spin ice ground state of Ho2Ti2O7 is characterized by a
pattern of rectangular diffuse elastic scattering within the [HHL] plane of
reciprocal space, which closely resembles the zone boundary scattering seen in
its sister compound Dy2Ti2O7. Well-defined peaks in the zone boundary
scattering develop only within the spin ice ground state below ~ 2 K. In
contrast, the overall diffuse scattering pattern evolves on a much higher
temperature scale of ~ 17 K. The diffuse scattering at small wavevectors below
[001] is found to vanish on going to Q=0, an explicit signature of expectations
for dipolar spin ice. Very high energy-resolution inelastic measurements reveal
that the spin ice ground state below ~ 2 K is also characterized by a
transition from dynamic to static spin correlations on the time scale of
10^{-9} seconds. Measurements in a magnetic field applied along the
[1${\bar1}$0] direction in zero-field cooled conditions show that the system
can be broken up into orthogonal sets of polarized alpha chains along
[1${\bar1}$0] and quasi-one-dimensional beta chains along [110]. Three
dimensional correlations between beta chains are shown to be very sensitive to
the precise alignment of the [1${\bar1}$0] externally applied magnetic field.


title: Cosmological CPT violating effect on CMB polarization

abstract:
  A dark energy scalar (or a function of the Ricci scalar) coupled with the
derivative to the matter fields will violate the $CPT$ symmetry during the
expansion of the Universe. This type of cosmological $CPT$ violation helps to
generate the baryon number asymmetry and gives rise to the rotation of the
photon polarization which can be measured in the astrophysical and cosmological
observations, especially the experiments of the cosmic microwave background
radiation. In this paper, we derive the rotation angle in a fully general
relativistic way and present the rotation formulas used for the cosmic
microwave background data analysis. Our formulas include the corrections from
the spatial fluctuations of the scalar field. We also estimate the magnitude of
these corrections in a class of dynamical dark energy models for quintessential
baryo/leptogenesis.


title: Strangeness Production and Hadron Spectroscopy at HERA

abstract:
  An overview of the recent results on strangeness production and spectroscopy
from the electron-proton collider experiments H1 and ZEUS at HERA is presented.
Production of particles with light and strange quarks is discussed and compared
with both theoretical predictions and with data from e+e- experiments.
Measurements in the charm sector cover studies of the radially and orbitally
excited charm states. Finally, the investigation of exotic states in the
strangeness sector at HERA is reviewed.


title:
Spectroscopy and dissociative recombination of the lowest rotational
  states of H3+

abstract:
  The dissociative recombination of the lowest rotational states of H3+ has
been investigated at the storage ring TSR using a cryogenic 22-pole
radiofrequency ion trap as injector. The H3+ was cooled with buffer gas at ~15
K to the lowest rotational levels, (J,G)=(1,0) and (1,1), which belong to the
ortho and para proton-spin symmetry, respectively. The rate coefficients and
dissociation dynamics of H3+(J,G) populations produced with normal- and para-H2
were measured and compared to the rate and dynamics of a hot H3+ beam from a
Penning source. The production of cold H3+ rotational populations was
separately studied by rovibrational laser spectroscopy using chemical probing
with argon around 55 K. First results indicate a ~20% relative increase of the
para contribution when using para-H2 as parent gas. The H3+ rate coefficient
observed for the para-H2 source gas, however, is quite similar to the H3+ rate
for the normal-H2 source gas. The recombination dynamics confirm that for both
source gases, only small populations of rotationally excited levels are
present. The distribution of 3-body fragmentation geometries displays a broad
part of various triangular shapes with an enhancement of ~12% for events with
symmetric near-linear configurations. No large dependences on internal state or
collision energy are found.


title: Rising optical afterglows seen by TAROT

abstract:
  We present the multi-wavelength study of those gamma-ray bursts observed by
TAROT. These events are characterized by the presence at early time of a rising
in their optical light curves lasting a few hundred of seconds. In one case
(GRB 060904B), a flare occurs at similar time in the X-ray band, while in the
other cases the X-ray light curves appear smooth during the optical rise. We
investigate the possible nature of this behavior and conclude th at a
multi-component emission is mandatory to explain the optical-to-X-ray
afterglow.


title: Discrete Tomography of F-Type Icosahedral Model Sets

abstract:
  We address the problem of uniquely reconstructing F-type icosahedral
quasicrystals from few images produced by quantitative high resolution
transmission electron microscopy and explain recent results in the discrete
tomography of these sets.


title:
Dynamical and chemical effects of FR II radio sources on the
  intra-cluster medium

abstract:
  We investigate the effects of intermittent strong jets from an Active
Galactic Nuclei (AGN) of a massive galaxy in the core of a cool core galaxy
cluster, on the dynamics and metal distribution of the intra-cluster medium
(ICM). We use a simple model for the metal distribution within the host galaxy
which includes metal injection via star formation. We carry out 2D axisymmetric
hydrodynamic simulations of these systems. After having established a cooling
flow, two light jets are injected in opposite directions with a range of
(intermittent) active phases. We follow the time evolution of the system from
the jets' active phases up to 3 Gyr. The general metallicity evolution for all
our simulations is very similar on large-scales. The convective flows driven by
the jets advect gas and metals from the central galaxy to distances beyond 1.5
Mpc within the cluster. Intermittent jets are able to distribute metals to
grater radii. The metal injection has effects on the general metal abundances
present in the ICM, the faster the metal replenishment time the higher the
metal abundance. Although metallicity gradients in the very central regions of
cool core clusters are likely to be shaped by less-energetic phenomena, we find
evidence in our simulations for metallicity gradients similar to those observed
out to ~400 kpc radius. The metal distribution details of the central galaxy
have no effects on the dynamical evolution of the ICM metals.


title:
Jet substructure as a new Higgs search channel at the Large Hadron
  Collider

abstract:
  We show that W H and Z H production where the Higgs boson decays to bbbar can
be recovered as good search channels for the Standard Model Higgs at the Large
Hadron Collider. This is done by requiring the Higgs to have high transverse
momentum, and employing state-of-the-art jet reconstruction and decomposition
techniques.


title:
Application of a miniaturized photoacoustic cell for high-sensitivity
  laser detection of ammonia in gas media

abstract:
  We present a photoacoustic resonant cell, the internal volume of which is ~
0.5 cm^3. The cavity shape of the cell is so adapted in order to minimize the
background signal arising due to absorption of laser beam in the cell windows.
An experimental setup, measurement procedure and design of the cell are
described. Results of detection of ammonia in nitrogen flow with the help of a
CO2-laser are represented. The minimal detectable absorption for the cell is
estimated in the experiment to be ~ 5.1 10^(-8) cm^(-1) W Hz^(-1/2)


title: On the relation between cluster and classical tilting

abstract:
  Let D be a triangulated category with a cluster tilting subcategory U. The
quotient category D/U is abelian; suppose that it has finite global dimension.
  We show that projection from D to D/U sends cluster tilting subcategories of
D to support tilting subcategories of D/U, and that, in turn, support tilting
subcategories of D/U can be lifted uniquely to maximal 1-orthogonal
subcategories of D.


title:
Sequential multi-photon strategy for semiconductor-based terahertz
  detectors

abstract:
  A semiconductor-based terahertz-detector strategy, exploiting a
bound-to-bound-to-continuum architecture, is presented and investigated. In
particular, a ladder of equidistant energy levels is employed, whose step is
tuned to the desired detection frequency and allows for sequential multi-photon
absorption. Our theoretical analysis demonstrates that the proposed
multi-subband scheme could represent a promising alternative to conventional
quantum-well infrared photodetectors in the terahertz spectral region.


title: Particle production vs. energy

abstract:
  This paper is about the available hadroproduction data to be used for the
tuning of neutrino beamline simulations, going from conventional neutrino beams
to superbeams and neutrino factories. Comparisons of data with existing Monte
Carlo computations will be shown. Recent results from the HARP experiment at
CERN PS will be summarized, including data useful for a better understanding of
extended air showers and atmospheric neutrinos simulations.


title:
Prospects for discovering new gauge bosons, extra dimensions and contact
  interaction at the LHC

abstract:
  This talk is a review of possible discoveries of exotic not Standard Model
Physics in the early stage of LHC (first two years), with the ATLAS and CMS
experiments. LHC will be the first experiment ever to explore the TeV region
and new exotic particles could be discovered at early stages of the LHC running
if their masses are not too large. This talk is focused on three main search
topics: new vector bosons, contact interaction and extra dimensions.


title: How knots influence properties of proteins

abstract:
  Molecular dynamics studies within a coarse-grained structure based model were
used on two similar proteins belonging to the transcarbamylase family to probe
the effects in the native structure of a knot. The first protein,
N-acetylornithine transcarbamylase, contains no knot whereas human ormithine
transcarbamylase contains a trefoil knot located deep within the sequence. In
addition, we also analyzed a modified transferase with the knot removed by the
appropriate change of a knot-making crossing of the protein chain. The studies
of thermally- and mechanically-induced unfolding processes suggest a larger
intrinsic stability of the protein with the knot.


title: Possible chromospheric activity cycles in II Peg, UX Ari and V711 Tau

abstract:
  We study the Mount Wilson indices we obtained indirectly from IUE high and
low resolution spectra of the RS CVn-type systems II Peg (K2IV), UX Ari
(K0IV+G5V) and V711 Tau (K1IV+G5V), extensively observed by IUE from 1978 to
1996. We analyze the activity signatures, which correspond to the primary star,
with the Lomb-Scargle periodogram. From the analysis of V711 Tau data, we found
a possible chromospheric cycle with a period of 18 years and a shorter near
3-year cycle, which could be associated to a chromospheric flip-flop cycle. The
data of II Peg also suggest a chromospheric cycle of near 21 years and a
flip-flop cycle of 9 years approximately. Finally, we obtained a possible
chromospheric cycle of near 6 years for UX Ari.


title: Anisotropic fragmentation in low-energy dissociative recombination

abstract:
  On a dense energy grid reaching up to 75 meV electron collision energy the
fragmentation angle and the kinetic energy release of neutral dissociative
recombination fragments have been studied in a twin merged beam experiment. The
anisotropy described by Legendre polynomials and the extracted rotational state
contributions were found to vary on a likewise narrow energy scale as the
rotationally averaged rate coefficient. For the first time angular dependences
higher than 2$^{nd}$ order could be deduced. Moreover, a slight anisotropy at
zero collision energy was observed which is caused by the flattened velocity
distribution of the electron beam.


title: Fixed point loci of moduli spaces of sheaves on toric varieties

abstract:
  Extending work of Klyachko and Perling, we develop a combinatorial
description of pure equivariant sheaves of any dimension on an arbitrary
nonsingular toric variety $X$. Using geometric invariant theory (GIT), this
allows us to construct explicit moduli spaces of pure equivariant sheaves on
$X$ corepresenting natural moduli functors (similar to work of Payne in the
case of equivariant vector bundles). The action of the algebraic torus on $X$
lifts to the moduli space of all Gieseker stable sheaves on $X$ and we express
its fixed point locus explicitly in terms of moduli spaces of pure equivariant
sheaves on $X$. One of the problems arising is to find an equivariant line
bundle on the side of the GIT problem, which precisely recovers Gieseker
stability. In the case of torsion free equivariant sheaves, we can always
construct such equivariant line bundles. As a by-product, we get a
combinatorial description of the fixed point locus of the moduli space of
$\mu$-stable reflexive sheaves on $X$. As an application, we show in a sequel
how these methods can be used to compute generating functions of Euler
characteristics of moduli spaces of $\mu$-stable torsion free sheaves on
nonsingular complete toric surfaces.


title:
Bound states and magnetic field-induced valley splitting in gate-tunable
  graphene quantum dots

abstract:
  The magnetic field dependence of energy levels in gapped single- and bilayer
graphene quantum dots (QDs) defined by electrostatic gates is studied
analytically in terms of the Dirac equation. Due to the absence of sharp edges
in these types of QDs, the valley degree of freedom is a good quantum number.
We show that its degeneracy is efficiently and controllably broken by a
magnetic field applied perpendicular to the graphene plane. This opens up a
feasible route to create well-defined and well controlled spin- and
valley-qubits in graphene QDs. We also point out the similarities and
differences in the spectrum between single- and bilayer graphene quantum dots.
Striking in the case of bilayer graphene is the anomalous bulk Landau level
(LL) that crosses the gap which results in crossings of QD states with this
bulk LL at large magnetic fields in stark contrast to the single-layer case
where this LL is absent. The tunability of the gap in the bilayer case allows
us to observe different regimes of level spacings directly related to the
formation of a pronounced ``Mexican hat'' in the bulk bandstructure. We discuss
the applicability of such QDs to control and measure the valley isospin and
their potential use for hosting and controlling spin qubits.


title: The MICE PID Instrumentation

abstract:
  The international Muon Ionization Cooling Experiment (MICE) will carry out a
systematic investigation of ionization cooling of a muon beam. As the emittance
measurement will be done on a particle-by-particle basis, sophisticated beam
instrumentation is needed to measure particle coordinates and timing vs RF. A
PID system based on three time-of-flight stations, two Aerogel Cerenkov
detectors and a KLOE-like calorimeter has been constructed in order to keep
beam contamination ($e, \pi$) well below 1%. The MICE time-of-flight system
will measure timing with a resolution better than 70 ps per plane, in a harsh
environment due to high particle rates, fringe magnetic fields and electron
backgrounds from RF dark current.


title:
Phase States and Phase Portraits of Tunnel Traffic. Empirical Data
  Analysis

abstract:
  The 3D fundamental diagrams and phase portraits for tunnel traffic is
constructed based on the empirical data collected during the last years in the
deep long branch of the Lefortovo tunnel located on the 3rd circular highway in
Moscow. This tunnel of length 3 km is equipped with a dense system of
stationary ra-diodetetors distributed uniformly along it chequerwise at spacing
of 60 m. The data were averaged over 30 s. Each detector measures three
characteristics of the vehicle ensemble; the flow rate, the car velocity, and
the occupancy for three lanes individually. The conducted analysis reveals
complexity of phase states of tunnel traffic. In particular, we show the
presence of cooperative traffic dynamics in this tunnel and the variety of
phase states different in properties. Besides, the regions of regular and
stochastic dynamics are found and the presence of dynamical traps is
demonstrated.


title: Continuity of ring *-homomorphisms between C*-algebras

abstract:
  The purpose of this short note is to prove that if $A$ and $B$ are unital
C*-algebras and $\phi : A \to B$ is a unital *-preserving ring homomorphism,
then $\phi$ is contractive; i.e., $\| \phi (a) \| \leq \| a \|$ for all $a \in
A$. (Note that we do not assume $\phi$ is linear.) We use this result to deduce
a number of corollaries as well as characterize the form of such unital
*-preserving ring homomorphisms. (This note may be of interest to
C*-algebraists as well as algebraists who study noncommutative rings and
algebras. It is meant to be accessible to a general mathematician and does not
require any prior knowledge of C*-algebras.)


title:
Cryogenic Composite Detectors for the Dark Matter Experiments CRESST and
  EURECA

abstract:
  Weakly Interacting Massive Particles (WIMPs) are candidates for non-baryonic
Dark Matter. WIMPs are supposed to interact with baryonic matter via scattering
off nuclei producing a nuclear recoil with energies up to a few 10 keV with a
very low interaction rate of ~10^(-6) events per kg of target material and day
in the energy region of interest. The Dark Matter experiment CRESST (Cryogenic
Rare Event Search with Superconducting Thermometers) and the EURECA project
(European Underground Rare Event Calorimeter Array) are aimed at the direct
detection of WIMPs with the help of very sensitive modularised cryogenic
detectors that basically consist of a transition edge sensor (TES) in
combination with a massive absorber crystal. In the CRESST experiment the
search for coherent WIMP-nucleon scattering events is validated by the
detection of two processes. In the scintillating absorber single crystal,
CaWO_4, heat (phonons) and scintillation light are produced and detected with
two independent cryogenic detectors: a phonon channel and a separate light
channel. The development of such cryogenic detectors and the potential
ton-scale production are investigated in this paper. To decouple the TES
production from the choice of the target material in order to avoid heating
cycles of the absorber crystal and to allow pretesting of the TESs, a composite
detector design (CDD) for the detector production has been developed and
studied. An existing thermal detector model has been extended to the CDD, in
order to investigate, understand, and optimize the performance of composite
detectors. This extended model, which has been worked out in detail, can be
expected to provide a considerable help when tailoring composite detectors to
the requirements of various experiments.


title:
Deep MERLIN 5GHz Radio Imaging of Supernova Remnants in the M82
  Starburst

abstract:
  The results of an extremely deep, 8-day long observation of the central kpc
of the nearby starburst galaxy M82 using MERLIN (Multi-Element Radio Linked
Interferometer Network) at 5 GHz are presented. The 17E-06 Jy/beam, rms noise
level in the naturally weighted image make it the most sensitive high
resolution radio image of M82 made to date. Over 50 discrete sources are
detected, the majority of which are supernova remnants, but with 13 identified
as HII regions. Sizes, flux densities and radio brightnesses are given for all
of the detected sources, which are all well resolved with a majority showing
shell or partial shell structures. Those sources within the sample which are
supernova remnants have diameters ranging from 0.3 to 6.7 pc, with a mean size
of 2.9 pc.
  From a comparison with previous MERLIN 5 GHz observations made in July 1992,
which gives a 9.75 year timeline, it has been possible to measure the expansion
velocities of ten of the more compact sources, eight of which have not been
measured before. These derived expansion velocities range between 2200 and
10500 km/s.


title: Rankin Triple Products and Quantum Chaos

abstract:
  We prove explicit Harris-Kudla type formulas for triples of Maass forms,
holomorphic forms, and combinations thereof, on the hyperbolic plane modulo
congruence groups and co-compact lattices arising from Eichler orders of
quaternion algebras. These formulas relate the central value of the
corresponding Rankin triple product L-function to a squared trilinear period
integral. Assuming subconvexity estimates for these L-values, we prove Quantum
Unique Ergodicity on such quotients; the relevant Lindelof hypotheses imply a
quantitative form of QUE, with an optimal rate. In connection with the
Berry/Hejhal Random Wave conjecture, we prove decay of third moments in the
high energy limit, making use of a subconvexity result of Iwaniec/Ivic/Jutila
and Kim-Shahidi's result on cuspidality of the symmetric cube.


title: Transport and noise in organic field effect devices

abstract:
  The transport and fluctuation properties of organic molecules ordered
parallel between two Au contact leads are investigated by the method of surface
Green function. From first-principles simulation the relevant hopping
parameters are extracted and used to calculate nonlinear transport coefficients
with respect to an external bias voltage. A staggering of conductance is found
in dependence on the number of molecules squeezed in between the contacts. The
thermal properties show an anomalous behavior whenever the voltage reaches the
values of the molecular energy levels active for transport. The thermoelectric
figure of merit shows a resonance allowing to reach values even larger than
one.


title: A New Bijection Between Forests and Parking Functions

abstract:
  In 1980, G. Kreweras gave a recursive bijection between forests and parking
functions. In this paper we construct a nonrecursive bijection from forests
onto parking functions, which answers a question raised by R. Stanley. As a
by-product, we obtain a bijective proof of Gessel and Seo's formula for lucky
statistic on parking functions.


title:
Effect of Impurities on Pentacene Thin Film Growth for Field-Effect
  Transistors

abstract:
  Pentacenequinone (PnQ) impurities have been introduced into a pentacene
source material at number densities from 0.001 to 0.474 to quantify the
relative effects of impurity content and grain boundary structure on transport
in pentacene thin-film transistors. Atomic force microscopy (AFM) and
electrical measurements of top-contact pentacene thin-film transistors have
been employed to directly correlate initial structure and final film
structures, with the device mobility as a function of added impurity content.
The results reveal a factor four decrease in mobility without significant
changes in film morphology for source PnQ number fractions below ~0.008. For
these low concentrations, the impurity thus directly influences transport,
either as homogeneously distributed defects or by concentration at the
otherwise-unchanged grain boundaries. For larger impurity concentrations, the
continuing strong decrease in mobility is correlated with decreasing grain
size, indicating an impurity-induced increase in the nucleation of grains
during early stages of film growth.


title:
Mechanism and Kinetics of Na+ Ion Depletion under the Anode during
  Electro-thermal Poling of a Bioactive Glass

abstract:
  Electro-thermal poling experiments were carried out on a bioactive glass, and
the kinetics of the Na+ ion depletion layer formation under the anode was
studied in-situ by means of ac impedance spectroscopy. One important finding is
a linear relation between the depletion layer thickness and the applied
voltage, which is in contrast to the predictions of standard space charge
theory. The average electric field in the layer is independent of the voltage
and is close to the dielectric breakdown field of alkali ion conducting
glasses. Furthermore, we observe that the thickness of the depletion layer is
established on a much shorter time scale than the resistance. We explain these
results by assuming that the huge electric fields created under the anode
during Na+ ion depletion lead to a strong increase of the electronic mobility
in the layer and to charge compensation via extraction of electrons. It is
shown that in the initial stages of the depletion process, a relative Na+ ion
depletion of only 400 ppm is sufficient to generate electric fields of the
order of the dielectric breakdown field.


title:
Estimating the Parameters of Binomial and Poisson Distributions via
  Multistage Sampling

abstract:
  In this paper, we have developed a new class of sampling schemes for
estimating parameters of binomial and Poisson distributions. Without any
information of the unknown parameters, our sampling schemes rigorously
guarantee prescribed levels of precision and confidence.


title: Numerical simulation of N=1 supersymmetric Yang-Mills theory

abstract:
  We present results from a lattice study of SU(2) color, N=1 supersymmetric
Yang-Mills theory using domain wall fermions. Supersymmetry in this particular
lattice formulation is expected to emerge in the continuum and chiral limits
without any fine-tuning of operators. Preliminary results for the static quark
potential, residual mass, chiral condensate and spectrum--a potential indicator
of supersymmetry restoration--are presented and discussed.


title:
Variations in the dip properties of the low-mass X-ray binary XB 1254-69
  observed with XMM-Newton and INTEGRAL

abstract:
  We have analysed data from five XMM-Newton observations of XB 1254-69, one of
them simultaneous with INTEGRAL, to investigate the mechanism responsible for
the highly variable dips durations and depths seen from this low-mass X-ray
binary. Deep dips were present during two observations, shallow dips during one
and no dips were detected during the remaining two observations. At high (1-4
s) time resolution ``shallow dips'' are seen to include a few, very rapid, deep
dips whilst the ``deep'' dips consist of many similar very rapid, deep,
fluctuations. The folded V-band Optical Monitor light curves obtained when the
source was undergoing deep, shallow and no detectable dipping exhibit
sinusoid-like variations with different amplitudes and phases. We fit EPIC
spectra obtained from "persistent" or dip-free intervals with a model
consisting of disc-blackbody and thermal comptonisation components together
with Gaussian emission features at 1 and 6.6 keV modified by absorption due to
cold and photo-ionised material. None of the spectral parameters appears to be
strongly correlated with the dip depth except for the temperature of the disc
blackbody which is coolest (kT ~ 1.8 keV) when deep dips are present and
warmest (kT ~ 2.1 keV) when no dips are detectable. We propose that the changes
in both disc temperature and optical modulation could be explained by the
presence of a tilted accretion disc in the system. We provide a revised
estimate of the orbital period of 0.16388875 +/- 0.00000017 day.


title:
Effects of the anomalous Higgs couplings on the Higgs boson production
  at the Large Hadron Collider

abstract:
  We study the impact of dimension-six operators on single- and double-Higgs
production rates via gluon fusion at the Large Hadron Collider (LHC). If the
top-Yukawa coupling is modified by some new physics whose scale is of the TeV
scale, its effect changes the cross sections of single-Higgs production $gg\to
H$ and double-Higgs production $gg\to HH$ through the top-loop diagram. In
particular, double-Higgs production can receive significant enhancement from
the effective top-Yukawa coupling and the new dimension-five coupling $t{\bar
t}HH$ which are induced by the dimension-six operator. Comparing these results
to the forthcoming data at the LHC, one can extract information of the
dimension-six operators relevant to the top quark and the Higgs boson.


title: Relativistic Mechanics and a Special Role for the Coulomb Potential

abstract:
  It is shown that a nonrelativistic mechanical system involving a general
nonrelativistic potential V(|r1-r2|) between point particles at positions r1
and r2 can be extended to a Lagrangian system which is invariant under Lorentz
transformation through order v^2/c^2. However, this invariance requires the
introduction of velocity-dependent and acceleration-dependent forces between
particles. The textbook treatments of "relativistic mechanics" can be
misleading; the discussions usually deal with only one particle experiencing
prescribed forces and so make no mention of these additional velocity- and
acceleration-dependent forces. A simple example for a situation analogous to a
parallel-plate capacitor is analyzed for all the conservation laws of Galilean
invariance or Lorentz invariance. For this system, Galilean invariance requires
that the mechanical momentum is given by pmech=mv but places no restriction on
the position-dependent potential function. On the other hand, Lorentz
invariance requires that the mechanical momentum is given by
pmech=mv/(1-v^2/c^2)^1/2, and in addition requires that the potential function
is exactly the Coulomb potential V(|r1-r2|)=k/|r1-r2|. It is also noted that
the transmission of the interparticle-force signal at the speed of light again
suggests a special role for the Coulomb potential. A nonrelativistic particle
system interacting through the Coulomb potential becomes the Darwin Lagrangian
when extended to a system relativistic through order v^2/c^2, and then allows
extension to classical electrodynamics as a fully Lorentz-invariant theory of
interacting particles.


title: Combinatorial Hopf algebras

abstract:
  We define a "combinatorial Hopf algebra" as a Hopf algebra which is free (or
cofree) and equipped with a given isomorphism to the free algebra over the
indecomposables (resp. the cofree coalgebra over the primitives). The choice of
such an isomorphism implies the existence a finer algebraic structure on the
Hopf algebra and on the indecomposables (resp. the primitives). For instance a
cofree-cocommutative right-sided combinatorial Hopf algebra is completely
determined by its primitive part which is a pre-Lie algebra. The key example is
the Connes-Kreimer Hopf algebra. The study of all these combinatorial Hopf
algebra types gives rise to several good triples of operads. It involves the
operads: dendriform, pre-Lie, brace, and variations of them.


title:
Obstacle problem for SPDE with nonlinear Neumann boundary condition via
  reflected generalized backward doubly SDEs

abstract:
  This paper is intended to give a probabilistic representation for stochastic
viscosity solution of semi-linear reflected stochastic partial differential
equations with nonlinear Neumann boundary condition. We use it connection with
reflected generalized backward doubly stochastic differential equation.


title:
Spatial First-passage Statistics of Al/Si(111)-(root3 x root3) Step
  Fluctuations

abstract:
  Spatial step edge fluctuations on a multi-component surface of
Al/Si(111)-(root3 x root3) were measured via scanning tunneling microscopy over
a temperature range of 720K-1070K, for step lengths of L = 65-160 nm. Even
though the time scale of fluctuations of steps on this surface varies by orders
of magnitude over the indicated temperature ranges, measured first-passage
spatial persistence and survival probabilities are temperature independent. The
power law functional form for spatial persistence probabilities is confirmed
and the symmetric spatial persistence exponent is measured to be theta = 0.498
+/- 0.062 in agreement with the theoretical prediction theta = 1/2. The
survival probability is found to scale directly with y/L, where y is the
distance along the step edge. The form of the survival probabilities agree
quantitatively with the theoretical prediction, which yields exponential decay
in the limit of small y/L. The decay constant is found experimentally to be
ys/L= 0.076 +/- 0.033 for y/L <= 0.2.


title:
Extended Zeilberger's Algorithm for Identities on Bernoulli and Euler
  Polynomials

abstract:
  We present a computer algebra approach to proving identities on Bernoulli
polynomials and Euler polynomials by using the extended Zeilberger's algorithm
given by Chen, Hou and Mu. The key idea is to use the contour integral
definitions of the Bernoulli and Euler numbers to establish recurrence
relations on the integrands. Such recurrence relations have certain parameter
free properties which lead to the required identities without computing the
integrals.


title: Magnetic Modulation in Mechanical Alloyed Cr1.4fe0.6o3 Oxide

abstract:
  We have synthesized Cr1.4Fe0.6O3 compound through mechanical alloying of
Cr2O3 and Fe2O3 powders and subsequent thermal annealing. The XRD spectrum, SEM
picture and microanalysis of EDAX spectrum have been used to understand the
structural evolution in the alloyed compound. The alloyed samples are matching
to rhombohedral structure with R3C space group. The observation of a modulated
magnetic order confirmed a systematic diffusion of Fe atoms into the Cr sites
of lattice structure. A field induced magnetic behaviour is seen in the field
dependence of magnetization data of the annealed samples. The behaviour is
significantly different from the mechanical alloyed samples. The experimental
results provided the indications of considering the present material as a
potential candidate for opto-electronic applications.


title: Irreducible Lie-Yamaguti algebras

abstract:
  Lie-Yamaguti algebras (or generalized Lie triple systems) are binary-ternary
algebras intimately related to reductive homogeneous spaces. The Lie-Yamaguti
algebras which are irreducible as modules over their Lie inner derivation
algebra are the algebraic counterpart of the isotropy irreducible homogeneous
spaces. These systems will be shown to split into three disjoint types: adjoint
type, non-simple type and generic type. The systems of the first two types will
be classified and most of them will be shown to be related to a Generalized
Tits Construction of Lie algebras.


title: The Heliosphere in Time

abstract:
  Because of the dynamic nature of the interstellar medium, the Sun should have
encountered a variety of different interstellar environments in its lifetime.
As the solar wind interacts with the surrounding interstellar medium to form a
heliosphere, different heliosphere shapes, sizes, and particle contents result
from the different environments. Some of the large possible interstellar
parameter space (density, velocity, temperature) is explored here with the help
of global heliosphere models, and the features in the resulting heliospheres
are compared and discussed. The heliospheric size, expressed as distance of the
nose of the heliopause to the Sun, is set by the solar wind - interstellar
pressure balance, even for extreme cases. Other heliospheric boundary locations
and neutral particle results correlate with the interstellar parameters as
well. If the H0 clouds identified in the Millennium Arecibo survey are typical
of clouds encountered by the Sun, then the Sun spends ~99.4% of the time in
warm low density ISM, where the typical upwind heliosphere radii are up to two
orders of magnitude larger than at present.


title: A map from Lawson homology to Deligne Cohomology

abstract:
  A natural map from Lawson homology to Deligne cohomology groups for smooth
complex projective varieties is constructed by using the Harvey-Lawson spark
complexes. We also compare this to Abel-Jacobi type constructions by others.


title:
Polynomial maps over $p$-adics and residual properties of mapping tori
  of group endomorphisms

abstract:
  We continue our study of residual properties of mapping tori of free group
endomorphisms. In this paper, we prove that each of these groups are virtually
residually (finite $p$)-groups for all but finitely many primes$p$. The method
involves further studies of polynomial maps over finite fields and $p$-adic
completions of number fields.


title:
The Status and future of ground-based TeV gamma-ray astronomy. A White
  Paper prepared for the Division of Astrophysics of the American Physical
  Society

abstract:
  In recent years, ground-based TeV gamma-ray observatories have made
spectacular discoveries including imaging spectroscopy observations of galactic
sources of different classes, and the discovery of rapid gamma-ray flares from
radio galaxies and active galactic nuclei containing supermassive black holes.
These discoveries, and the fact that gamma-ray astronomy has the potential to
map the radiation from dark matter annihilation in our Galaxy and in
extragalactic systems, have attracted the attention of the wider scientific
community. The Division of Astrophysics of the American Physical Society
requested the preparation of a white paper on the status and future of
ground-based gamma-ray astronomy to define the science goals of a future
observatory, to determine the performance specifications, to identify the areas
of necessary technology development, and to lay out a clear path for proceeding
beyond the near term. The white paper was written with broad community input,
including discussions on several dedicated open meetings, and a number of APS
or other conferences. It contains an executive summary, detailed reports from
the science working groups, and appendices with supplementary material
including the full author lists for the different sections of the white paper
and a glossary.


title:
New gas mixtures suitable for rare event detection using a
  Micromegas-TPC detector

abstract:
  The aim of the presented work was to develop further techniques based on a
Micromegas-TPC, in order to reach a high gas gain with good energy resolution,
and to search for gas mixtures suitable for rare event detection. This paper
focuses on xenon, which is convenient for the search of neutrinoless double
beta decay in 136 Xe. Conversely, a small admixture of xenon to CF 4 can reduce
attachment in the latter. This gas mixture would be suitable for dark matter
searches and the study of solar and reactor neutrinos. Various configurations
of the Micromegas plane were investigated and are described.


title:
A near-IR variability study of the Galactic black hole: a red noise
  source with no detected periodicity

abstract:
  We present the results of near-infrared (2 and 3 microns) monitoring of Sgr
A*-IR with 1 min time sampling using the natural and laser guide star adaptive
optics (LGS AO) system at the Keck II telescope. Sgr A*-IR was observed
continuously for up to three hours on each of seven nights, between 2005 July
and 2007 August. Sgr A*-IR is detected at all times and is continuously
variable, with a median observed 2 micron flux density of 0.192 mJy,
corresponding to 16.3 magnitude at K'. These observations allow us to
investigate Nyquist sampled periods ranging from about 2 minutes to an hour.
Using Monte Carlo simulations, we find that the variability of Sgr A* in this
data set is consistent with models based on correlated noise with power spectra
having frequency dependent power law slopes between 2.0 to 3.0, consistent with
those reported for AGN light curves. Of particular interest are periods of ~20
min, corresponding to a quasi-periodic signal claimed based upon previous
near-infrared observations and interpreted as the orbit of a 'hot spot' at or
near the last stable orbit of a spinning black hole. We find no significant
periodicity at any time scale probed in these new observations for periodic
signals. This study is sensitive to periodic signals with amplitudes greater
than 20% of the maximum amplitude of the underlying red noise component for
light curves with duration greater than ~2 hours at a 98% confidence limit.


title:
Dirac equations in curved space-time versus Papapetrou spinning
  particles

abstract:
  We find out classical particles, starting from Dirac quantum fields on a
curved space-time, by an eikonal approximation and a localization hypothesis
for amplitudes. We recover the results by Mathisson-Papapetrou, hence
establishing a fundamental correspondence between the coupling of classical and
quantum spinning particles with the gravitational field.


title: Results on charged kaon and hyperon decays from NA48

abstract:
  Recent results from the NA48/1 and NA48/2 experiments at the CERN SPS are
presented. NA48/2 carried out data taking in 2003 and 2004 collecting charged
kaon decays: branching ratios and form factors have been measured for the rare
K+- to pi+-e+e-, K+- to pi+-gammagamma and K+- to pi+-e+e-gamma decays. The
NA48/1 experiment has taken data in 2002 using only the Ks beam at an increased
intensity measuring neutral hyperon radiative decays. Using this data, which
exceeds present statistics by about one order of magnitude, a new precise
measurement of the Csi_0 decay asymmetries has been obtained.


title: Structural phase stability and Magnetism in Co2FeO4 spinel oxide

abstract:
  We report a correlation between structural phase stability and magnetic
properties of Co2FeO4 spinel oxide. We employed mechanical alloying and
subsequent annealing to obtain the desired samples. The particle size of the
samples changes from 25 nm to 45 nm. The structural phase separation of
samples, except sample annealed at 9000C, into Co rich and Fe rich spinel phase
has been examined from XRD spectrum, SEM picture, along with EDAX spectrum, and
magnetic measurements. The present study indicated the ferrimagnetic character
of Co2FeO4, irrespective of structural phase stability. The observation of
mixed ferrimagnetic phases, associated with two Curie temperatures at TC1 and
TC2 (>TC1), respectively, provides the additional support of the splitting of
single cubic spinel phase in Co2FeO4 spinel oxide.


title:
On the viability of SUSY GUTs with Yukawa unification: the crucial role
  of FCNCs

abstract:
  After a short overview of the hypothesis of Yukawa unification within SUSY
GUTs, I detail on the general conditions for its phenomenological viability,
emphasizing the decisive role played by observables in the flavor sector.


title: Free holomorphic automorphisms of the unit ball of $B(H)^n$

abstract:
  The theory of characteristic functions for row contractions is used to
determine the group $Aut(B(H)^n_1)$ of all free holomorphic automorphisms of
the unit ball of $B(H)^n$. We show that the noncommutative Poisson transform
commutes with the action of the automorphism group $Aut(B(H)^n_1)$. This leads
to a characterization of the unitarily implemented automorphisms of the
Cuntz-Toeplitz algebra $C^*(S_1,..., S_n)$, which leave invariant the
noncommutative disc algebra $\cA_n$. This result provides new insight into
Voiculescu's group of automorphisms of the Cuntz-Toeplitz algebra and reveals
new connections with noncommutative multivariable operator theory, especially,
the theory of characteristic functions for row contractions and the
noncommutative Poisson transforms. We study the isometric dilations and the
characteristic functions of row contractions under the action of the
automorphism group $Aut(B(H)^n_1)$. This enables us to obtain some results
concerning the behavior of the curvature and the Euler characteristic of a row
contraction under $Aut(B(H)^n_1)$. We prove a maximum principle for free
holomorphic functions on the noncommutative ball $[B(H)^n]_1$ and provide some
extensions of the classical Schwarz lemma to our noncommutative setting.


title:
Hadronic top-quark pair production in association with a hard jet at
  next-to-leading order QCD: Phenomenological studies for the Tevatron and the
  LHC

abstract:
  We report on the calculation of the next-to-leading order QCD corrections to
the production of top--antitop-quark pairs in association with a hard jet at
the Tevatron and at the LHC. Results for integrated and differential cross
sections are presented. We find a significant reduction of the scale
dependence. In most cases the corrections are below 20% indicating that the
perturbative expansion is well under control. Moreover, the forward--backward
charge asymmetry of the top-quark, which is analyzed at the Tevatron, is
studied at next-to-leading order. We find large corrections suggesting that the
definition of the observable has to be refined.


title:
Tunnelling through a semiconducting spacer: complex band predictions vs.
  thin film calculations

abstract:
  Using a simple tight-binding model, we compare the limitations of the
tunnelling predictions coming out of the complex band structure of a
semiconductor with the output of thin film calculations done for the same
semiconducting spacer but considering it to be of finite width, and sandwiched
by metallic electrodes. The comparison is made as a function of spacer width
and interfacial roughness.


title:
Doubly excited ferromagnetic spin-chain as a pair of coupled kicked
  rotors

abstract:
  We show that the dynamics of a doubly-excited 1D Heisenberg ferromagnetic
chain, subject to short pulses from a parabolic magnetic field may be analyzed
as a pair of quantum kicked rotors. By focusing on the two-magnon dynamics in
the kicked XXZ model we investigate how the anisotropy parameter - which
controls the strength of the magnon-magnon interaction - changes the nature of
the coupling between the two "image" coupled Kicked Rotors. We investigate
quantum state transfer possibilities and show that one may control whether the
spin excitations are transmitted together, or separate from each other.


title: On alpha stable distribution of wind driven water surface wave slope

abstract:
  We propose a new formulation of the probability distribution function of wind
driven water surface slope with an $\alpha$-stable distribution probability.
The mathematical formulation of the probability distribution function is given
under an integral formulation. Application to represent the probability of time
slope data from laboratory experiments is carried out with satisfactory
results. We compare also the $\alpha$-stable model of the water surface slopes
with the Gram-Charlier development and the non-Gaussian model of Liu et
al\cite{Liu}. Discussions and conclusions are conducted on the basis of the
data fit results and the model analysis comparison.


title:
Features of Kamiokande-II, IMB and Baksan observations and their
  interpretation in a two-component model for the signal

abstract:
  We consider the time, angular and energy distributions of SN1987A events
discussing the quality of their agreement with the expectations. A global
interpretation is performed considering a simple model, based on the standard
scenario for the explosion. Despite the contrasting and confusing indications,
a straightforward fit to the data provides a result that does not contradict
but rather supports the expectations. The calculated electron antineutrino flux
is applied to predict the relic neutrino signal.


title:
Some proves of integrated influence of geomagnetic activity and weather
  changes on human health

abstract:
  Our environment includes many factors, and each person on the Earth is
permanently influenced by two of them: weather and magnetic field. It was found
in the works of many investigators that the weather changes correlate with
human health state. In the same time, disturbances of geomagnetic field (as one
of the space weather manifestations) may influence bioobjects, including
people. In this work we demonstrate the cumulative effect of different external
factors (space weather and meteorological weather parameters) on human health
on the base of medical experimental data (blood pressure and heart rate data
rows for 86 people). It is shown that inclusion both solar-geomagnetic and
weather parameters in simulation process give adjusting mixed parameter, which
correlates with health state significantly better, than separated environmental
parameters do.


title: Tunnel transport through multiple junctions

abstract:
  We calculate the conductance through double junctions of the type
M(inf.)-Sn-Mm-Sn-M(inf.) and triple junctions of the type
M(inf.)-Sn-Mm-Sn-Mm-Sn-M(inf.), where M(inf.) are semi-infinite metallic
electrodes, Sn are 'n' layers of semiconductor and Mm are 'm' layers of metal
(the same as the electrodes), and compare the results with the conductance
through simple junctions of the type M(inf.)-Sn-M(inf.). The junctions are
bi-dimensional and their parts (electrodes and 'active region') are periodic in
the direction perpendicular to the transport direction. To calculate the
conductance we use the Green's Functions Landauer-B$\ddot{u}$ttiker formalism.
The electronic structure of the junction is modeled by a tight binding
Hamiltonian. For a simple junction we find that the conductance decays
exponentially with semiconductor thickness. For double and triple junctions,
the conductance oscillates with the metal in-between thickness, and presents
peaks for which the conductance is enhanced by 1-4 orders of magnitude. We find
that when there is a conductance peak, the conductance is higher to that
corresponding to a simple junction. The maximum ratio between the conductance
of a double junction and the conductance of a simple junction is 146 %, while
for a triple junction it is 323 %. These oscillations in the conductance are
explained in terms of the energy spectrum of the junction's active region.


title: A High Energy Electron and Photon Detector Simulation System

abstract:
  A detailed Monte-Carlo code has been developed from basic principles that
simulates almost all of the basic photon and charged particle interactions. The
code is used to derive the response functions of a high energy photon detector
to incident beams of photons of various energies. The detector response
matrices (DRMs) are calculated using this code. Deconvolution of an
artificially generated spectrum is presented.


title: Average Fe K-alpha emission from distant AGN

abstract:
  One of the most important parameters in the XRB (X-ray background) synthesis
models is the average efficiency of accretion onto SMBH (super-massive black
holes). This can be inferred from the shape of broad relativistic Fe lines seen
in X-ray spectra of AGN (active galactic nuclei). Several studies have tried to
measure the mean Fe emission properties of AGN at different depths with very
different results. We compute the mean Fe emission from a large and
representative sample of AGN X-ray spectra up to redshift ~ 3.5. We developed a
method of computing the rest-frame X-ray average spectrum and applied it to a
large sample (more than 600 objects) of type 1 AGN from two complementary
medium sensitivity surveys based on XMM-Newton data, the AXIS and XWAS samples.
This method makes use of medium-to-low quality spectra without needing to fit
complex models to the individual spectra but with computing a mean spectrum for
the whole sample. Extensive quality tests were performed by comparing real to
simulated data, and a significance for the detection of any feature over an
underlying continuum was derived. We detect with a 99.9% significance an
unresolved Fe K-alpha emission line around 6.4 keV with an EW ~ 90 eV, but we
find no compelling evidence of any significant broad relativistic emission line
in the final average spectrum. Deviations from a power law around the narrow
line are best represented by a reflection component arising from cold or
low-ionization material. We estimate an upper limit for the EW of any
relativistic line of 400 eV at a 3 sigma confidence level. We also marginally
detect the so-called Iwasawa-Taniguchi effect on the EW for the unresolved
emission line, which appears weaker for higher luminosity AGN.


title: Chiral loop corrections in B to D l nu decays

abstract:
  We determine chiral loop corrections to the B meson decay amplitudes to
positive and negative parity charmed mesons within a framework which combines
heavy quark and chiral symmetries. We find that corrections due to states of
opposite parity are competitive with the contributions arising from K and eta
meson loops. Since lattice studies rely on the chiral behavior of the
amplitudes we discuss the chiral limit of our results. We also comment on the
extraction of 1/m_B, 1/m_D subleading form factors relevant for the studies of
B_q to D_q tau nu decays, which are sensitive to possible helicity-suppressed
new physics contributions.


title: Reciprocal locomotion of dense swimmers in Stokes flow

abstract:
  Due to the kinematic reversibility of Stokes flow, a body executing a
reciprocal motion (a motion in which the sequence of body configurations
remains identical under time reversal) cannot propel itself in a viscous fluid
in the limit of negligible inertia; this result is known as Purcell's scallop
theorem. In this limit, the Reynolds numbers based on the fluid inertia and on
the body inertia are all zero. Previous studies characterized the breakdown of
the scallop theorem with fluid inertia. In this paper we show that, even in the
absence of fluid inertia, certain dense bodies undergoing reciprocal motion are
able to swim. Using Lorentz's reciprocal theorem, we first derive the general
differential equations that govern the locomotion kinematics of a dense
swimmer. We demonstrate that no reciprocal swimming is possible if the body
motion consists only of tangential surface deformation (squirming). We then
apply our general formulation to compute the locomotion of four simple
swimmers, each with a different spatial asymmetry, that perform normal surface
deformations. We show that the resulting swimming speeds (or rotation rates)
scale as the first power of a properly defined "swimmer Reynolds number'',
demonstrating thereby a continuous breakdown of the scallop theorem with body
inertia.


title: Solutions for real dispersionless Veselov-Novikov hierarchy

abstract:
  We investigate the dispersionless Veselov-Novikov (dVN) equation based on the
framework of dispersionless two-component BKP hierarchy. Symmetry constraints
for real dVN system are considered. It is shown that under symmetry reductions,
the conserved densities are therefore related to the associated Faber
polynomials and can be solved recursively. Moreover, the method of hodograph
transformation as well as the expressions of Faber polynomials are used to find
exact real solutions of the dVN hierarchy.


title: The semilinear wave equation on asymptotically euclidean manifolds

abstract:
  We consider the quadratically semilinear wave equation on R^d, d>=3, equipped
with a Riemannian metric. This metric is non-trapping and approaches the
Euclidean metric polynomially at infinity. Using Mourre estimates and the Kato
theory of smoothness, we obtain a Keel-Smith-Sogge type inequality for the
linear equation. Thanks to this estimate, we prove long time existence (d=3)
and global existence (d>3) for the nonlinear problem with small initial data.


title: Tau trigger at the ATLAS experiment

abstract:
  Many theoretical models, like the Standard Model or SUSY at large tan(beta),
predict Higgs bosons or new particles which decay more abundantly to final
states including tau leptons than to other leptons. At the energy scale of the
LHC, the identification of tau leptons, in particular in the hadronic decay
mode, will be a challenging task due to an overwhelming QCD background which
gives rise to jets of particles that can be hard to distinguish from hadronic
tau decays. Equipped with excellent tracking and calorimetry, the ATLAS
experiment has developed tau identification tools capable of working at the
trigger level. This contribution presents tau trigger algorithms which exploit
the main features of hadronic tau decays and describes the current tau trigger
commissioning activities.


title: Improved analysis of SN1987A antineutrino events

abstract:
  We propose a new parameterization of the antineutrino flux from core collapse
supernovae, that allows an interpretation of its astrophysical parameters
within the Bethe and Wilson scenario for the explosion, and that leads to a
reasonable (smooth) behavior of the average energy and of the luminosity curve.
We apply it to analyze the events observed by Kamiokande-II, IMB and Baksan
detectors in correlation with SN1987A. For the first time, we consider in the
same analysis all data characteristics: times, energies and angles of the
observed events. We account for the presence of background and evaluate the
impact of neutrino oscillations. The hypothesis that the initial luminous phase
of emission (accretion) is absent can be rejected at the 2 % significance
level. Without the need to impose external priors in the likelihood analysis,
the best-fit values of the astrophysical parameters are found to be in
remarkable agreement with the expectations of the standard core-collapse
scenario; in particular, the electron antineutrino-sphere radius is 16 km, the
duration of the accretion phase is found to be 0.55 s, and the initial
accreting mass is 0.22 M(sun). Similarly the total energy emitted in neutrinos
is 2.2*10^{53} erg, again close to the expectations. The errors on the
parameters are evaluated and found to be relatively large, consistently with
the limited number of detected events; the two dimensional confidence regions,
that demonstrate the main correlations between the parameters, are also given.


title: Linear extension of the Erdos-Heilbronn conjecture

abstract:
  The famous Erdos-Heilbronn conjecture plays an important role in the
development of additive combinatorics. In 2007 Z. W. Sun made the following
further conjecture (which is the linear extension of the Erdos-Heilbronn
conjecture): For any finite subset A of a field F and nonzero elements
$a_1,...,a_n$ of F, the set {a_1x_1+...+a_nx_n: x_1,....,x_n are distinct
elements of A} has cardinality at least min{p(F)-delta, n(|A|-n)+1}, where the
additive order p(F) of the multiplicative identity of F is different from n+1,
and delta=0,1 takes the value 1 if and only if n=2 and $a_1+a_2=0$. In this
paper we prove this conjecture of Sun when $p(F)\geq n(3n-5)/2$. We also obtain
a sharp lower bound for the cardinality of the restricted sumset {x_1+...+x_n:
x_1\in A_1,...,x_n\in A_n, and P(x_1,...,x_n)\not=0}, where $A_1,...,A_n$ are
finite subsets of a field F and $P(x_1,...,x_n)$ is a general polynomial over
F.


title: New analytic models of traversable wormholes

abstract:
  The analytic solution of the general relativity equations for spherically
symmetric wormholes are given. We investigate the special case of a
"traversable" wormhole i.e., one allowing the signal to pass through it. The
energy-momentum tensor of wormhole matter is represented as a superposition of
a spherically symmetric magnetic field and dust matter with negative matter
density. The dynamics of the model are investigated. We discuss both the
solution of the equation with a Lambda-term and without it. Superposing enough
dust matter, a magnetic field, and a Lambda-term can produce a static solution,
which turns out to be a spherical Multiverse model with an infinite number of
wormholes connected spherical universes. Corresponding solution can be static
and dynamic.


title: Measurements of the angle alpha (phi2) at B factories

abstract:
  The measurements of the angle alpha (phi2) of the unitarity triangle at the B
factories are reviewed. The value of alpha determined by combining the results
obtained in the B to pi pi, B to rho pi, and B to rho rho modes by both the
BABAR and Belle experiments is (87.5 +6.2 -5.3) degrees.


title: Critically damped quantum search

abstract:
  Although measurement and unitary processes can accomplish any quantum
evolution in principle, thinking in terms of dissipation and damping can be
powerful. We propose a modification of Grover's algorithm in which the idea of
damping plays a natural role. Remarkably, we have found that there is a
critical damping value that divides between the quantum $O(\sqrt{N})$ and
classical O(N) search regimes. In addition, by allowing the damping to vary in
a fashion we describe, one obtains a fixed-point quantum search algorithm in
which ignorance of the number of targets increases the number of oracle queries
only by a factor of 1.5.


title:
VERITAS Observations of the Arrival Directions of the Highest Energy
  Cosmic Rays

abstract:
  The recent discovery by the Pierre Auger collaboration of anisotropy in the
arrival directions of the highest energy cosmic rays, correlated with the
positions of nearby active galactic nuclei, encourages the search for
counterpart TeV gamma-ray emission. Approximately half of the sky viewed by the
southern hemisphere Pierre Auger experiment is also visible at reasonable
elevations for the northern hemisphere gamma-ray telescope array, VERITAS. We
report on first observations by VERITAS of regions associated with the arrival
directions of ultra-high energy cosmic ray events.


title: Molecules in the disk orbiting the twin young suns of V4046 Sgr

abstract:
  We report the results of a mm-wave molecular line survey of the nearby (D ~
70 pc), 12 Myr-old system V4046 Sgr -- a tight (9 R_sun separation),
short-period (2.42 day) binary with nearly equal component masses of ~0.9 M_sun
-- conducted with the 30 m telescope of the Institut de Radio Astronomie
Millimetrique (IRAM). We detected rotational transitions of 12CO 13CO, HCN, CN,
and HCO+. The double-peaked CO line profiles of V4046 Sgr are well fit by a
model invoking a Keplerian disk with outer radius of ~250 AU that is viewed at
an inclination i = 35 degrees. We infer minimum disk gas and dust masses of ~13
and ~20 Earth masses from the V4046 Sgr CO line and submm continuum fluxes,
respectively. The actual disk gas mass could be much larger if the gas-phase CO
is highly depleted and/or 13CO is very optically thick. The overall similarity
of the circumbinary disk of V4046 Sgr to the disk orbiting the single, ~8
Myr-old star TW Hya -- a star/disk system often regarded as representative of
the early solar nebula -- indicates that gas giant planets are likely
commonplace among close binary star systems. Given the relatively advanced age
and proximity of V4046 Sgr, these results provide strong motivation for future
high-resolution imaging designed to ascertain whether a planetary system now
orbits its twin suns.


title: Star formation in M33: multiwavelength signatures across the disk

abstract:
  Aims. We use different tracers, such as Ha, ultraviolet (UV), and infrared
(IR) emissions at various wavelengths, to study the dust and star-formation
(SF) conditions throughout the disk of M33. Methods. We derive the radial
distribution of dust, of the old and young stellar population using Spitzer and
GALEX data, complemented by ground-based optical data and available surveys of
atomic and molecular gas. We separate the contribution of discrete sources to
the IR brightness from the diffuse emission. Results. At 8 and 24 um, discrete
sources account for 40% of the IR emission in the innermost 3 kpc, and for 20%
further out. We find that stochastic emission from very small grains in the
diffuse interstellar medium accounts for only 10% of the diffuse 24 um
emission, and that dusty circumstellar shells of unresolved, evolved AGB stars
(carbon stars) are a viable alternative. The 8 um profile suggests that PAH
emission declines faster with radius than the dust continuum. In annular
regions, 0.24 kpc wide, we find a mean extinction value for stellar continuum
AV = 0.25 mag with a weak dependence on radius, consistent with the shallow
metallicity gradient observed. Dust opacity derived from the 160 um emission
decreases instead by a factor 10 from the center to edge of the SF disk.
Conclusions. Using extinction corrected UV and Ha maps we find the global SF
rate in M33, over the last 100 Myr, to be 0.45 +- 0.10 M yr-1. FIR (far-IR) and
TIR (total-IR) luminosities can trace SF even though a high conversion factor
is required to recover the effective rate. If carbon stars are powering the
diffuse 24 um emission in M33 this can trace star formation 1 Gyr ago and
provide a more complete view of the SF history of the galaxy. [abridged]


title: Status of the VERITAS Observatory

abstract:
  VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for
gammma-ray astronomy in the GeV-TeV range, has recently completed its first
season of observations with a full array of four telescopes. A number of
astrophysical gamma-ray sources have been detected, both galactic and
extragalactic, including sources previously unknown at TeV energies. We
describe the status of the array and some highlight results, and assess the
technical performance, sensitivity and shower reconstruction capabilities.


title: New Bound States of several Top-quarks bound by Higgs Exchange

abstract:
  It is suggested that there is a fine tuning principle remarkably arranging
the top-quark Yukawa coupling to be just so as to make the mass $m_{12}$ of a
bound state of 6 top + 6 anti-top quarks become very small. The value of the
top Yukawa needed for Higgs and gluon etc. exchanges just binding the 12 quarks
to make this mass zero is $g_t|_{m_{12}=0} =1.01 \pm 0.15$, while the
experimental running top Yukawa coupling is $g_t = .94$.


title: On the nature of HD 207331: a new Delta Scuti variable

abstract:
  While testing a Stromgren spectrophotometer attached to the 1.5-m telescope
at the San Pedro Martir observatory, Mexico, a number of A-type stars were
observed, one of which, HD 207331, presented clear indications of photometric
variability. CCD photometric data acquired soon after, confirmed its
variability. In order to determine its pulsation behaviour more accurately,
uvby differential photoelectric photometry was carried out for three nights. As
a result of the period analysis of the light curves we have found a dominant
pulsation mode at 21.1 c/d with an amplitude of 6 mmag. This strongly suggests
that HD 207331 is a new Delta Scuti-type pulsating star.


title: Tree level spontaneous R-symmetry breaking in O'Raifeartaigh models

abstract:
  We show that in O'Raifeartaigh models of spontaneous supersymmetry breaking,
R-symmetries can be broken by non-zero values of fields at tree level, rather
than by vacuum expectation values of pseudomoduli at loop level. As a
complement of the recent result by Shih, we show that there must be a field in
the theory with R-charge different from zero and two in order for R-symmetry
breaking to occur, no matter whether the breaking happens at tree or loop
level. We review the example by CDFM, and construct two types of tree level
R-symmetry breaking models with a wide range of parameters and free of runaway
problem. And the R-symmetry is broken everywhere on the pseudomoduli space in
these models. This provides a rich set of candidates for SUSY model building
and phenomenology.


title: On the Fractal Distribution of HII Regions in Disk Galaxies

abstract:
  In this work we quantify the degree to which star-forming events are clumped.
We apply a precise and accurate technique to calculate the correlation
dimension Dc of the distribution of HII regions in a sample of disk galaxies.
Our reliable results are distributed in the range 1.5<Dc<2.0. We get
significant variations in the fractal dimension among galaxies, contrary to a
universal picture sometimes claimed in literature. The faintest galaxies tend
to distribute their HII regions in more clustered (less uniform) patterns.
Moreover, the fractal dimension for the brightest HII regions within the same
galaxy seems to be smaller than for the faintest ones suggesting some kind of
evolutionary effect.


title: Mental States as Macrostates Emerging from EEG Dynamics

abstract:
  Correlations between psychological and physiological phenomena form the basis
for different medical and scientific disciplines, but the nature of this
relation has not yet been fully understood. One conceptual option is to
understand the mental as "emerging" from neural processes in the specific sense
that psychology and physiology provide two different descriptions of the same
system. Stating these descriptions in terms of coarser- and finer-grained
system states (macro- and microstates), the two descriptions may be equally
adequate if the coarse-graining preserves the possibility to obtain a dynamical
rule for the system. To test the empirical viability of our approach, we
describe an algorithm to obtain a specific form of such a coarse-graining from
data, and illustrate its operation using a simulated dynamical system. We then
apply the method to an electroencephalographic (EEG) recording, where we are
able to identify macrostates from the physiological data that correspond to
mental states of the subject.


title: Anthropic calculation of the velocity and acceleration of the space-time

abstract:
  In this paper considering quantum heat transport equation (QHT) formulated in
our earlier papers the temperature for universes with G < 0 is calculated. As
the solution of complex QHT (Schrodinger type equation), the temperature is
complex also. We argue that due to anthropic limitation of the observer
ImT(r,t)=0 From this condition the discretization of space-time radius R,
velocity of the universe expansion v, Hubble parameter H and acceleration of
the expansion a are calculated. The agreement with observational data for our
Universe is quite good. PACS 98.62.Py PACS 98.80.Bp PACS 98.80.Cq


title:
The structure of N=2 multi-instanton and string-loop corrections in
  toroidal orbifold models

abstract:
  We summarize the structure of N=2 multi-instanton and string loop corrections
to the K\"ahler potential and the gauge kinetic function in type I toroidal
orbifold models. For that aim, we exploit perturbative calculations of the
physical gauge couplings on the heterotic dual, whenever such a perturbative
description is available.


title:
Critical temperature of non-interacting Bose gases on disordered
  lattices

abstract:
  For a non-interacting Bose gas on a lattice we compute the shift of the
critical temperature for condensation when random-bond and onsite disorder are
present. We evidence that the shift depends on the space dimensionality D and
the filling fraction f. For D -> infinity (infinite-range model), using results
from the theory of random matrices, we show that the shift of the critical
temperature is negative, depends on f, and vanishes only for large f. The
connections with analogous results obtained for the spherical model are
discussed. For D=3 we find that, for large f, the critical temperature Tc is
enhanced by disorder and that the relative shift does not sensibly depend on f;
at variance, for small f, Tc decreases in agreement with the results obtained
for a Bose gas in the continuum. We also provide numerical estimates for the
shift of the critical temperature due to disorder induced on a non-interacting
Bose gas by a bichromatic incommensurate potential.


title:
Practical random number generation protocol for entanglement-based
  quantum key distribution

abstract:
  A simple protocol which takes advantage of the inherent random times of
detections in single photon counting modules is presented for random active
basis choices when using entanglement-based protocols for Quantum Key
Distribution (QKD). It may also be applicable to the BB84 protocol in certain
cases. The scheme presented uses the single photon detectors already present on
a QKD setup, working on the same rate as the system is capable of detecting,
and is, therefore, not limited by the output rates of quantum random number
generators. This protocol only requires small hardware modifications making it
an attractive solution. We perform a proof-of-principle experiment employing a
spontaneous parametric down-conversion process in a $\chi^{(2)}$ non-linear
crystal to demonstrate the feasibility of our scheme, and show that the
generated sequence passes randomness tests.


title:
The Algebra of Formal Twisted Pseudodifferential Symbols and a
  Noncommutative Residue

abstract:
  We extend the Adler-Manin trace on the algebra of pseudodifferential symbols
to a twisted setting.


title: Exact solutions to Waring's problem for finite fields

abstract:
  The Waring function $g(k,q)$ measures the difficulty of Waring's problem for
$k$th powers in the field of $q$ elements. Its calculation seems to be
difficult, and many partial results have been published, notably upper bounds
for certain regions of the $k$-$q$-plane. In this paper, we compute the exact
value of $g(k,q)$ for two infinite families of exponent-field pairs. In these,
$k$ is large compared to $q$. We use a new method of proof that is mainly
combinatorial in nature.


title: Peer-review in the Internet age

abstract:
  The importance of peer-review in the scientific process can not be
overestimated. Yet, due to increasing pressures of research and exponentially
growing number of publications the task faced by the referees becomes ever more
difficult. We discuss here a few possible improvements that would enable more
efficient review of the scientific literature, using the growing Internet
connectivity. In particular, a practical automated model for providing the
referees with references to papers that might have strong relationship with the
work under review, based on general network properties of citations is
proposed.


title: On some Fano--Enriques threefolds

abstract:
  We give a classification of Fano threefolds $X$ with canonical Gorenstein
singularities such that $X$ possess a regular involution, which acts freely on
some smooth surface in $|-K_X|$, and the linear system $|-K_X|$ gives a
morphism which is not an embedding. From this classification one gets, in
particular, a description of some natural class of Fano--Enriques threefolds.


title:
Direct photon emission from hadronic sources: Hydrodynamics vs.
  Transport theory

abstract:
  Direct photon emission in heavy-ion collisions is calculated within the
relativistic microscopic transport model UrQMD. We compare the results from the
pure transport calculation to a hybrid-model calculation, where the
high-density part of the evolution is replaced by an ideal 3-dimensional
fluiddynamic calculation. The effects of viscosity, present in the transport
model but neglected in ideal fluid-dynamics, are examined. We study the
contribution of different production channels and non-thermal collisions to the
spectrum of direct photons. Detailed comparison to the measurements by the
WA~98-collaboration are undertaken.


title: Optical Observations of SAX J1808.4-3658 During Quiescence

abstract:
  We observed the accreting millisecond pulsar SAX J1808.4-3658 with
Gemini-South in g' and i' bands, nearly simultaneous with XMM-Newton
observations. A clear periodic flux modulation on the system's orbital period
is present, consistent with the varying aspect of the donor star's heated face.
We model the contributions of a disk and donor star to these optical bands. To
produce the observed modulation amplitudes, we conclude that the donor must be
irradiated by an external flux 2 orders of magnitude greater than provided by
the measured X-ray luminosity. A possible explanation for this irradiation is
that the radio pulsar mechanism becomes active during the quiescent state as
suggested by Burderi et al., with relativistic particles heating the donor's
day-side face. Our modelling constrains the binary inclination to be between 36
and 67 degrees. We obtain estimates for the pulsar mass of >2.2 solar masses
(although this limit is sensitive to the source's distance), consistent with
the accelerated NS cooling in this system indicated by X-ray observations. We
also estimate the donor mass to be in the range of 0.07-0.11 solar masses,
providing further indications that the system underwent non-standard binary
evolution to reach its current state.


title: Simple and Robust Solver for the Poisson-Boltzmann Equation

abstract:
  A variational approach is used to develop a robust numerical procedure for
solving the nonlinear Poisson-Boltzmann equation. Following Maggs et al., we
construct an appropriate constrained free energy functional, such that its
Euler-Lagrange equations are equivalent to the Poisson-Boltzmann equation. We
then develop, implement, and test an algorithm for its numerical minimization,
which is quite simple and unconditionally stable. The analytic solution for
planar geometry is used for validation. Furthermore, some results are presented
for a charged colloidal sphere surrounded by counterions.


title:
Cosmological simulations of the Santa Barbara cluster: the influence of
  scalar fields

abstract:
  We present numerical N-body simulation studies of large-scale structure
formation. The main purpose of these studies is to analyze the several models
of dark matter and the role they played in the process of large-scale structure
formation. We analyze in this work a flat cold dark matter dominated model
known as the Santa Barbara cluster. We compare the results for this model using
the standard Newtonian limit of general relativity with the corresponding
results of using the Newtonian limit of scalar-tensor theories. An specific
model is the one that considers that the scalar field is non-minimally coupled
to the Ricci scalar in the Einstein-Hilbert Lagrangian. Comparisons of the
models are done showing results of rotation curves, density profiles, and
velocity dispersions for halos formed at z=0. We analyze, in particular, the
Santa Barbara cluster and its possible equation of state.


title: Neutrino Mass Models: a road map

abstract:
  In this talk we survey some of the recent promising developments in the
search for the theory behind neutrino mass and mixing, and indeed all fermion
masses and mixing. The talk is organized in terms of a neutrino mass models
road map according to which the answers to experimental questions provide sign
posts to guide us through the maze of theoretical models eventually towards a
complete theory of flavour and unification.


title: Behavior of the current in the asymmetric quantum multibaker map

abstract:
  Recently, a new mechanism leading to purely quantum directed transport in the
asymmetric multibaker map has been presented. Here, we show a comprehensive
characterization of the finite asymptotic current behavior with respect to the
$h$ value, the shape of the initial conditions, and the features of the
spectrum. We have considered different degrees of asymmetry in these studies
and we have also analyzed the classical and quantum phase space distributions
for short times in order to understand the mechanisms behind the generation of
the directed current.


title: Hadronic B_u and B_d decays

abstract:
  I present latest measurements from the B factories of branching fractions for
B meson decays to hadronic two- and three-body final states. These include the
rate of doubly Cabibbo-suppressed charge states of charmed mesons in two-body
decays, charmed baryons and other structure seen in baryonic B decays, and
charmless mesonic two-body decays in comparison with estimates from theory.


title: Granular discharge and clogging for tilted hoppers

abstract:
  We measure the flux of spherical glass beads through a hole as a systematic
function of both tilt angle and hole diameter, for two different size beads.
The discharge increases with hole diameter in accord with the Beverloo relation
for both horizontal and vertical holes, but in the latter case with a larger
small-hole cutoff. For large holes the flux decreases linearly in cosine of the
tilt angle, vanishing smoothly somewhat below the angle of repose. For small
holes it vanishes abruptly at a smaller angle. The conditions for zero flux are
discussed in the context of a {\it clogging phase diagram} of flow state vs
tilt angle and ratio of hole to grain size.


title: Epsilon regime calculations with reweighted clover fermions

abstract:
  We perform fully dynamical simulations at small quark masses by reweighting
in the quark mass, calculating the weight factors stochastically. This approach
avoids some of the technical difficulties associated with direct simulations.
We find that the weight factors fluctuate only moderately on nHYP smeared
dynamical Wilson-clover ensembles, and demonstrate that the overlap between the
original and reweighted configurations is large both for short and long
distance observables. We could successfully reweight 16^4, (1.85fm)^4 volume
configurations from m_q 20 MeV to m_q~5 MeV, and 24^4, (2.77fm)^4
configurations from m_q~8MeV to m_q~MeV quark masses, reaching the
epsilon-regime. Using the pseudoscalar and axialvector correlators we predict
the low energy constants Sigma and F and study their volume and mass
dependence.


title:
Further Constraints on Thermal Quiescent X-ray Emission from SAX
  J1808.4-3658

abstract:
  We observed SAX J1808.4-3658 (1808), the first accreting millisecond pulsar,
in deep quiescence with XMM-Newton and (near-simultaneously) Gemini-South. The
X-ray spectrum of 1808 is similar to that observed in quiescence in 2001 and
2006, describable by an absorbed power-law with photon index 1.74+-0.11 and
unabsorbed X-ray luminosity L_X=7.9+-0.7*10^{31} ergs/s, for N_H=1.3*10^{21}
cm^{-2}. Fitting all the quiescent XMM-Newton X-ray spectra with a power-law,
we constrain any thermally emitting neutron star with a hydrogen atmosphere to
have a temperature less than 30 eV and L_{NS}(0.01-10 keV)<6.2*10^{30} ergs/s.
A thermal plasma model also gives an acceptable fit to the continuum. Adding a
neutron star component to the plasma model produces less stringent constraints
on the neutron star; a temperature of 36^{+4}_{-8} eV and L_{NS}(0.01-10
keV)=1.3^{+0.6}_{-0.8}*10^{31} ergs/s. In the framework of the current theory
of neutron star heating and cooling, the constraints on the thermal luminosity
of 1808 and 1H 1905+000 require strongly enhanced cooling in the cores of these
neutron stars.
  We compile data from the literature on the mass transfer rates and quiescent
thermal flux of the largest possible sample of transient neutron star LMXBs. We
identify a thermal component in the quiescent spectrum of the accreting
millisecond pulsar IGR J00291+5934, which is consistent with the standard
cooling model. The contrast between the cooling rates of IGR J00291+5934 and
1808 suggests that 1808 may have a significantly larger mass. This can be
interpreted as arising from differences in the binary evolution history or
initial neutron star mass in these otherwise similar systems.


title: Nonlinear stability of time-periodic viscous shocks

abstract:
  In order to understand the nonlinear stability of many types of time-periodic
travelling waves on unbounded domains, one must overcome two main difficulties:
the presence of embedded neutral eigenvalues and the time-dependence of the
associated linear operator. This problem is studied in the context of
time-periodic Lax shocks in systems of viscous conservation laws. Using spatial
dynamics and a decomposition into separate Floquet eigenmodes, it is shown that
the linear evolution for the time-dependent operator can be represented using a
contour integral similar to that of the standard time-independent case. By
decomposing the resulting Green's distribution, the leading order behavior
associated with the embedded eigenvalues is extracted. Sharp pointwise bounds
are then obtained, which are used to prove that time-periodic Lax shocks are
linearly and nonlinearly stable under the necessary conditions of spectral
stability and minimal multiplicity of the translational eigenvalues. The latter
conditions hold, for example, for small-oscillation time-periodic waves that
emerge through a supercritical Hopf bifurcation from a family of
time-independent Lax shocks of possibly large amplitude.


title: Operator Mixing and the AdS/CFT correspondence

abstract:
  We provide a direct prescription for computing the mixing among gauge
invariant operators in N=4 SYM. Our approach is based on the action of the
superalgebra on the states of the theory and thus it can be also applied to
resolve the mixing in the dual string description. As an example, we focus on
the supermultiplet containing the BMN operators with two impurities. On the
field theory side, we derive the leading planar quantum corrections to the
naive expression of the highest weight state. Then we use the same prescription
in the BMN limit of the AdS5xS5 string theory and derive the form of the
2-impurity highest weight state. The string expression matches nicely the SYM
result and provides a prediction for the mixing due to higher order quantum
corrections in field theory.


title: A Short Review on Jet Identification

abstract:
  Jets can be used to probe the physical properties of the high energy density
matter created in collisions at the Relativistic Heavy Ion Collider (RHIC).
Measurements of strong suppression of inclusive hadron distributions and
di-hadron correlations at high $p_{T}$ have already provided evidence for
partonic energy loss. However, these measurements suffer from well-known
geometric biases due to the competition of energy loss and fragmentation. These
biases can be avoided if the jets are reconstructed independently of their
fragmentation details - quenched or unquenched. In this paper, we discuss
modern jet reconstruction algorithms (cone and sequential recombination) and
their corresponding background subtraction techniques required by the high
multiplicities of heavy ion collisions. We review recent results from the STAR
experiment at RHIC on direct jet reconstruction in central Au+Au collisions at
$\sqrt {s_{NN}}= 200$ GeV.


title: Search for Isolated Leptons with Missing pt and Multi-leptons at HERA

abstract:
  A search for events with one or more isolated leptons in the final state is
performed on a data sample collected in e+-p collisions with the H1 and ZEUS
detectors at the HERA collider. The data sample corresponds to an integrated
luminosity of ~1 fb-1, representing the full HERA high-energy data set. The
yields of single, di- and tri-lepton events are measured and compared to the
Standard Model predictions, looking for possible deviations. No significant
discrepancy with respect to the Standard Model expectations is observed.


title: Measurements of the CKM angle gamma at BaBar

abstract:
  We report on our recent measurements of the Cabibbo-Kobayashi-Maskawa
CP-violating phase gamma and of related CP-asymmetries and branching fraction
ratios. The measurements have been performed on samples of up to 465 million
BBbar pairs collected by the BaBar detector at the SLAC PEP-II
asymmetric-energy B factory in the years 1999-2007.


title: On the Capacity of One-sided Two user Gaussian Fading Broadcast Channels

abstract:
  In this paper, we investigate upper and lower bounds on the capacity of
two-user fading broadcast channels where one of the users has a constant
(non-fading) channel. We use the Costa entropy power inequality (EPI) along
with an optimization framework to derive upper bounds on the sum-capacity and
superposition coding to obtain lower bounds on the sum-rate for this channel.
For this fading broadcast channel where one channel is constant, we find that
the upper and lower bounds meet under special cases, and in general, we show
that the achievable sum-rate comes within a constant of the outer bound.