title:
Effect of long-range hopping on Tc in a two-dimensional Hubbard-Holstein
  model of the cuprates

abstract:
  We study the effect of long-range hoppings on Tc for the two-dimensional (2D)
Hubbard model with and without Holstein phonons using parameters evaluated from
band-structure calculations for cuprates. Employing the dynamical cluster
approximation (DCA) with a quantum Monte Carlo (QMC) cluster solver for a
4-site cluster, we observe that without phonons, the long-range hoppings, t'
and t'', generally suppress Tc. We argue that this trend remains valid for
larger clusters. In the presence of the Holstein phonons, a finite t' enhances
Tc in the under-doped region for the hole-doped system, consistent with
local-density approximation (LDA) calculations and experiment. This is
interpreted through the suppression of antiferromagnetic (AF) correlations and
the interplay between polaronic effects and the antiferromagnetism.


title: Non-Markovian interaction of many fields

abstract:
  We study the interaction between several fields initially in coherent states.
The solution allows us to explain why coherent states remain coherent states
when subject to non-Markovian dissipation. We first study the interaction
between two fields and show that this is the building block of the total
interaction. We give a completely algebraic solution of this system.


title: Metric connections in projective differential geometry

abstract:
  We search for Riemannian metrics whose Levi-Civita connection belongs to a
given projective class. Following Sinjukov and Mikes, we show that such metrics
correspond precisely to suitably positive solutions of a certain projectively
invariant finite-type linear system of partial differential equations.
Prolonging this system, we may reformulate these equations as defining
covariant constant sections of a certain vector bundle with connection. This
vector bundle and its connection are derived from the Cartan connection of the
underlying projective structure.


title: Unifying distribution functions: some lesser known distributions

abstract:
  We show that there is a way to unify distribution functions that describe
simultaneously a signal in space and (spatial) frequency. Probably the most
known of them is the Wigner distribution function. Here we show how to unify
functions of the Cohen class, Rihacek's complex energy function, Husimi and
Glauber-Sudarshan distribution functions.


title: Holographic Models of Electroweak Symmetry Breaking

abstract:
  We review the status of models of electroweak symmetry breaking in a slice of
anti--de Sitter space. These models can be thought of as dual to strongly
interacting theories of the electroweak scale. After an introduction to some
generic issues in bulk theories in AdS5, we concentrate on the model-building
of the Higgs sector.


title: J/psi production at the Tevatron and RHIC from s-channel cut

abstract:
  We report on our recent evaluation of the s-channel cut contribution to J/psi
hadroproduction. We show that it is likely significantly larger than the usual
cut contribution of the colour-singlet model (CSM), which is known to
underestimate the experimental measurements. Here the s-channel cut develops
for configurations with off-shell quarks in the bound state. A correct
treatment of its contribution requires the introduction of a four point
function, partially constrained by gauge invariance and limiting behaviours at
small and large momenta. When the unconstrained degrees of freedom are fixed to
reproduce the Tevatron data, we show that RHIC data are remarkably well
reproduced down to very low transverse momenta P_T without need of resummation
of initial-state gluon effects. This unique feature might be typical of
s-channel cut contribution.


title: Quantum theory of ultracold atom-ion collisions

abstract:
  We study atom-ion scattering in the ultracold regime. To this aim, an
analytical model based on the multichannel quantum defect formalism is
developed and compared to close-coupled numerical calculations. We investigate
the occurrence of magnetic Feshbach resonances focusing on the specific 40Ca+ -
Na system. The presence of several resonances at experimentally accessible
magnetic fields should allow the atom-ion interaction to be precisely tuned. A
fully quantum-mechanical study of charge exchange processes shows that
charge-exchange rates should remain small even in the presence of resonance
effects. Most of our results can be cast in a system-independent form and are
important for the realization of the charge-neutral ultracold systems.


title: Fourth Family Neutrinos and the Higgs Boson

abstract:
  We evaluate the LHC discovery potential for the fourth family Standard Model
neutrinos in the process $pp\to Z/h\to\nu_{4}{\bar{\nu}_{4}}\to W\mu W\mu$. We
show that, depending on their masses, the simultaneous discovery of both the
Higgs boson and the heavy neutrinos is probable at early stages of LHC
operation. Results are presented for both Majorana and Dirac type fourth family
neutrinos.


title: Gradient estimates for a nonlinear parabolic equation under Ricci flow

abstract:
  Let $(M,g(t))$, $0\le t\le T$, be a n-dimensional complete noncompact
manifold, $n\ge 2$, with bounded curvatures and metric $g(t)$ evolving by the
Ricci flow $\frac{\partial g_{ij}}{\partial t}=-2R_{ij}$. We will extend the
result of L. Ma and Y. Yang and prove a local gradient estimate for positive
solutions of the nonlinear parabolic equation $\frac{\1 u}{\1 t}=\Delta
u-au\log u-qu$ where $a\in\R$ is a constant and $q$ is a smooth function on
$M\times [0,T]$.


title: Chandra Observations of the Northeastern Rim of the Cygnus Loop

abstract:
  We present results from spatially resolved spectral analyses of the
northeastern (NE) rim of the Cygnus Loop supernova remnant (SNR) based on two
Chandra observations. One pointing includes northern outermost
abundance-enhanced regions discovered by recent Suzaku observations, while the
other pointing is located on regions with "normal" abundances in the NE rim of
the Cygnus Loop. The superior spatial resolving power of Chandra allows us to
reveal that the abundance-enhanced region is concentrated in an about
200"-thickness region behind the shock front. We confirm absolute metal
abundances (i.e., relative to H) as well as abundance ratios between metals are
consistent with those of the solar values within a factor of about 2. Also, we
find that the emission measure in the region gradually decreases toward the
shock front. These features are in contrast with those of the ejecta fragments
around the Vela SNR, which leads us to believe that the abundance enhancements
are not likely due to metal-rich ejecta. We suggest that the origin of the
plasma in this region is the interstellar medium (ISM). In the "normal"
abundance regions, we confirm that abundances are depleted to the solar values
by a factor of about 5 that is not expected in the ISM around the Cygnus Loop.
Introduction of non-thermal emission in our model fitting can not naturally
resolve the abundance-depletion problem. The origin of the depletion still
remains as an open question.


title: E\"otv\"os branes

abstract:
  The high value of brane tension has a crucial role in recovering Einstein's
general relativity at low energies. In the framework of a recently developed
formalism with variable brane tension one can pose the question, whether it was
always that high? In analogy with fluid membranes, in this paper we allow for
temperature dependent brane tension, according to the corresponding law
established by E\"otv\"os. For cosmological branes this assumption leads to
several immediate consequences: (a) The brane Universe was created at a finite
temperature $T_{c}$ and scale factor $a_{\min}$. (b) Both the brane tension and
the 4-dimensional gravitational coupling 'constant' increase with the scale
factor from zero to asymptotic values. (c) The 4-dimensional cosmological
'constant' evolves with $a$, starting with a huge negative value, passing
through zero, finally reaching a small positive value. Such a scale-factor
dependent cosmological constant is able to generate a surplus of attraction at
small $a$ (as dark matter does) and a late-time repulsion at large $a$ (dark
energy). In the particular toy model discussed here the evolution of the brane
tension is compensated by energy interchange between the brane and the fifth
dimension, such that the continuity equation holds for the cosmological fluid.
The resulting cosmology closely mimics the standard model at late times, a
decelerated phase being followed by an accelerated expansion. The energy
absorption of the brane drives the 5D space-time towards maximal symmetry,
becoming Anti de Sitter.


title: Simulating coalescing compact binaries by a new code SACRA

abstract:
  We report our new code (named SACRA) for numerical relativity simulations in
which an adaptive mesh refinement algorithm is implemented. In this code, the
Einstein equations are solved in the BSSN formalism with a fourth-order finite
differencing, and the hydrodynamic equations are solved by a third-order
high-resolution central scheme. The fourth-order Runge-Kutta scheme is adopted
for integration in time. To test the code, simulations for coalescence of black
hole-black hole (BH-BH), neutron star-neutron star (NS-NS), and black
hole-neutron star (BH-NS) binaries are performed, and also, properties of BHs
formed after the merger and gravitational waveforms are compared among those
three cases. For the simulations of BH-BH binaries, we adopt the same initial
conditions as those by Buonanno et al. and compare numerical results. We find
reasonable agreement except for a slight disagreement possibly associated with
the difference in choice of gauge conditions and numerical schemes. For an
NS-NS binary, we performed simulations employing both SACRA and Shibata's
previous code, and find reasonable agreement. For a BH-NS binary, we compare
numerical results with our previous ones, and find that gravitational waveforms
and properties of the BH formed after the merger agree well with those of our
previous ones, although the disk mass formed after the merger is less than 0.1%
of the total rest mass, which disagrees with the previous result. We also
report numerical results of a longterm simulation (with $\sim 4$ orbits) for a
BH-NS binary for the first time. All these numerical results show behavior of
convergence, and extrapolated numerical results for time spent in the inspiral
phase agree with post-Newtonian predictions in a reasonable accuracy.


title: HAT-P-9b: A Low Density Planet Transiting a Moderately Faint F star

abstract:
  We report the discovery of a planet transiting a moderately faint (V=12.3
mag) late F star, with an orbital period of 3.92289 +/- 0.00004 days. From the
transit light curve and radial velocity measurements we determine that the
radius of the planet is R_p = 1.40 +/- 0.06 R_Jup and that the mass is M_p =
0.78 +/- 0.09 M_Jup. The density of the new planet, rho = 0.35 +/- 0.06 g
cm^{-3}, fits to the low-density tail of the currently known transiting
planets. We find that the center of transit is at T_c = 2454417.9077 +/- 0.0003
(HJD), and the total transit duration is 0.143 +/- 0.004 days. The host star
has M_s = 1.28 +/- 0.13 M_Sun and R_s = 1.32 +/- 0.07 R_Sun.


title:
Recognizing indecomposable subcontinua of surfaces from their
  complements

abstract:
  We prove two theorems which allow one to recognize indecomposable subcontinua
of closed surfaces without boundary. If $X$ is a subcontinuum of a closed
surface $S$, we call the components of $S \setminus X$ the complementary
domains of $X$. We prove that a continuum is either indecomposable or the union
of two indecomposable continua whenever it has a sequence of distinct
complementary domains whose boundaries limit to the continuum in the Hausdorff
metric. We define a slightly stronger condition on the complementary domains of
a continuum, called the double-pass condition, which we conjecture is
equivalent to indecomposability of the continuum. We prove that this is so for
continua which are not the boundary of one of their complementary domains.


title: CY Manifolds with Locally Symmetric Moduli Spaces

abstract:
  There is a natural sequence of CY manifolds that are double covers of the
projective g dimensional spaces ramified over 2g+2 hyperplanes. We observe that
some of them are obtained as quotient of the action of the semi-direct product
of g-1 copies of cyclic Z/2Z groups with the symmetric g group on the product
of g-copies of hyper-elliptic curves of genus g. The quotient is a double cover
of the projective g space ramified over 2g+2 hyperplanes. This construction
generalizes the construction of a Kummer surface. The Kodaira-Spencer classes
on the Jacobian are invariant under the action of the group. Thus they form a
basis of Kodaira-Spencer classes on the CY manifold. Since the bracket of any
Kodaira-Spencer classes on the Jacobian are zero, then they will be zero on the
CY manifold. This implies that the moduli space of those CY manifolds is a
locally symmetric space.


title:
Log-T divergence and Insulator-to-Metal Crossover in the normal state
  resistivity of fluorine doped SmFeAsO1-xFx

abstract:
  We report the resistivity of a series of fluorine-doped SmFeAsO1-xFx
polycrystalline superconductors in magnetic fields up to 60T. For underdoped
samples (x < 0.15), the low temperature resistive state is characterized by
pronounced magneto-resistance and a resistive upturn at low temperatures. The
"insulating behavior" is characterized by a log-T divergence observed over a
decade in temperature. In contrast, the normal state for samples with doping x
> 0.15 display metallic behavior with little magnetoresistance, where intense
magnetic fields broaden the superconducting transition rather than suppress Tc.
The location of the insulator-to metal crossover coincides with the reported
suppression of the structural phase transition (SPT)in the phase diagram for
SmFeAsO1-xFx series.


title: Relations on Generalized Degree Sequences

abstract:
  We study degree sequences for simplicial posets and polyhedral complexes,
generalizing the well-studied graphical degree sequences. Here we extend the
more common generalization of vertex-to-facet degree sequences by considering
arbitrary face-to-flag degree sequences. In particular, these may be viewed as
natural refinements of the flag f-vector of the poset. We investigate
properties and relations of these generalized degree sequences, proving linear
relations between flag degree sequences in terms of the composition of rank
jumps of the flag. As a corollary, we recover an f-vector inequality on
simplicial posets first shown by Stanley.


title:
Hardcore bosons on checkerboard lattices near half filling: geometric
  frustration, vanishing charge order and fractional phase

abstract:
  We study a spinless hardcore boson model on checkerboard lattices by Green
function Monte Carlo method. At half filling, the ground state energy is
obtained up to $28\times 28$ lattice and extrapolated to infinite size, the
staggered pseudospin magnetization is found to vanish in the thermodynamic
limit. Thus the $(\pi,\pi)$ charge order is absent in this system. Away from
half filling, two defects induced by each hole (particle) may carry fractional
charge ($\pm e/2$). For one hole case, we study how the defect-defect
correlation changes with $t/J$, which is the ratio between the hopping integral
and cyclic exchange, equals to $V/2t$ when $V\gg t$. Moreover, we argue that
these fractional defects may propagate independently when the concentration of
holes (or defects) is large enough.


title: Compound real Wishart and q-Wishart matrices

abstract:
  We introduce a family of matrices with non-commutative entries that
generalize the classical real Wishart matrices.
  With the help of the Brauer product, we derive a non-asymptotic expression
for the moments of traces of monomials in such matrices; the expression is
quite similar to the formula derived in our previous work for independent
complex Wishart matrices. We then analyze the fluctuations about the
Marchenko-Pastur law. We show that after centering by the mean, traces of real
symmetric polynomials in q-Wishart matrices converge in distribution, and we
identify the asymptotic law as the normal law when q=1, and as the semicircle
law when q=0.

categories: math.PR math-ph math.CO math.MP math.OA math.ST stat.TH


title: Constructive Quantum Shannon Decomposition from Cartan Involutions

abstract:
  The work presented here extends upon the best known universal quantum
circuit, the Quantum Shannon Decomposition proposed in [Vivek V. Shende,
Stephen S. Bullock and Igor Markov, Synthesis of Quantum Logic Circuits, IEEE
Trans. Comput.-Aided Des. Integr. Circuits Syst. 25 (6): 1000-1010 (2006)]. We
obtain the basis of the circuit's design in a pair of Cartan decompositions.
This insight gives a simple constructive algorithm for obtaining the Quantum
Shannon Decomposition of a given unitary matrix in terms of the corresponding
Cartan involutions.


title: Unitarity Method with Spurious Pole

abstract:
  In unitarity cut method, compact input of on-shell tree level amplitudes is
crucial to simplify calculations. Although BCFW on-shell recursion relation
gives very compact tree level amplitudes, they usually contain spurious poles.
In this paper, we present a method to deal with this issue and provide explicit
simple algebraic functions for various coefficients in the presence of spurious
poles. As an application, we present analytic result (not just rational term)
for one-loop five gluon A(-++++) with scalar propagator for the first time.


title:
Approximation scheme for master equations: variational approach to
  multivariate case

abstract:
  We study an approximation scheme based on a second quantization method for a
chemical master equation. Small systems, such as cells, could not be studied by
the traditional rate equation approach because fluctuation effects are very
large in such small systems. Although a Fokker-Planck equation obtained by the
system size expansion includes the fluctuation effects, it needs large
computational costs for complicated chemical reaction systems. In addition,
discrete characteristics of the original master equation are neglected in the
system size expansion scheme. It has been shown that the usage of the second
quantization description and a variational method achieves tremendous reduction
in the dimensionality of the master equation approximately, without loss of the
discrete characteristics. We here propose a new scheme for the choice of
variational functions, which is applicable to multivariate cases. It is
revealed that the new scheme gives better numerical results than old ones and
the computational cost increases only slightly.


title:
Inverse scattering J-matrix approach to nucleon-nucleus scattering and
  the shell model

abstract:
  The $J$-matrix inverse scattering approach can be used as an alternative to a
conventional $R$-matrix in analyzing scattering phase shifts and extracting
resonance energies and widths from experimental data. A great advantage of the
$J$-matrix is that it provides eigenstates directly related to the ones
obtained in the shell model in a given model space and with a given value of
the oscillator spacing $\hbar\Omega$. This relationship is of a particular
interest in the cases when a many-body system does not have a resonant state or
the resonance is broad and its energy can differ significantly from the shell
model eigenstate. We discuss the $J$-matrix inverse scattering technique,
extend it for the case of charged colliding particles and apply it to the
analysis of $n\alpha$ and $p\alpha$ scattering. The results are compared with
the No-core Shell Model calculations of $^5$He and $^5$Li.


title:
Probing the Large-Scale Structure Around the Most Distant Galaxy
  Clusters from the Massive Cluster Survey

abstract:
  We present maps of the cosmic large-scale structure around the twelve most
distant galaxy clusters from the Massive Cluster Survey (MACS) as traced by the
projected surface density of galaxies on the cluster red sequence. Taken with
the Suprime-Cam wide-field camera on the Subaru telescope, the images used in
this study cover a 27x27 arcmin^2 area around each cluster, corresponding to 10
x 10 Mpc^2 at the median redshift of z = 0.55 of our sample. We directly detect
satellite clusters and filaments extending over the full size of our imaging
data in the majority of the clusters studied, supporting the picture of mass
accretion via infall along filaments suggested by numerical simulations of the
growth of clusters and the evolution of large-scale structure. A comparison of
the galaxy distribution near the cluster cores with the X-ray surface
brightness as observed with Chandra reveals, in several cases, significant
offsets between the gas and galaxy distribution, indicative of ongoing merger
events. The respective systems are ideally suited for studies of the dynamical
properties of gas, galaxies, and dark matter. In addition, the large-scale
filaments viewed at high contrast in these MACS clusters are prime targets for
the direct detection and study of the warm-hot intergalactic medium (WHIM).


title: Design, Development and Testing of Underwater Vehicles: ITB Experience

abstract:
  The last decade has witnessed increasing worldwide interest in the research
of underwater robotics with particular focus on the area of autonomous
underwater vehicles (AUVs). The underwater robotics technology has enabled
human to access the depth of the ocean to conduct environmental surveys,
resources mapping as well as scientific and military missions. This capability
is especially valuable for countries with major water or oceanic resources. As
an archipelagic nation with more than 13,000 islands, Indonesia has one of the
most abundant living and non-organic oceanic resources. The needs for the
mapping, exploration, and environmental preservation of the vast marine
resources are therefore imperative. The challenge of the deep water exploration
has been the complex issues associated with hazardous and unstructured undersea
and sea-bed environments. The paper reports the design, development and testing
efforts of underwater vehicle that have been conducted at Institut Teknologi
Bandung. Key technology areas have been identified and step-by-step development
is presented in conjunction with the need to meet the challenge of underwater
vehicle operation. A number of future research directions are also highlighted.


title:
Linear Parameter Varying Model Identification for Control of
  Rotorcraft-based UAV

abstract:
  A rotorcraft-based unmanned aerial vehicle exhibits more complex properties
compared to its full-size counterparts due to its increased sensitivity to
control inputs and disturbances and higher bandwidth of its dynamics. As an
aerial vehicle with vertical take-off and landing capability, the helicopter
specifically poses a difficult problem of transition between forward flight and
unstable hover and vice versa. The LPV control technique explicitly takes into
account the change in performance due to the real-time parameter variations.
The technique therefore theoretically guarantees the performance and robustness
over the entire operating envelope. In this study, we investigate a new
approach implementing model identification for use in the LPV control
framework. The identification scheme employs recursive least square technique
implemented on the LPV system represented by dynamics of helicopter during a
transition. The airspeed as the scheduling of parameter trajectory is not
assumed to vary slowly. The exclusion of slow parameter change requirement
allows for the application of the algorithm for aggressive maneuvering
capability without the need of expensive computation. The technique is tested
numerically and will be validated in the autonomous flight of a small scale
helicopter.


title:
Structural transitions in granular packs: statistical mechanics and
  statistical geometry investigations

abstract:
  We investigate equal spheres packings generated from several experiments and
from a large number of different numerical simulations. The structural
organization of these disordered packings is studied in terms of the network of
common neighbours. This geometrical analysis reveals sharp changes in the
network's clustering occurring at the packing fractions (fraction of volume
occupied by the spheres respect to the total volume, $\rho$) corresponding to
the so called Random Loose Packing limit (RLP, $\rho \sim 0.555$) and Random
Close Packing limit (RCP, $\rho \sim 0.645$). At these packing fractions we
also observe abrupt changes in the fluctuations of the portion of free volume
around each sphere. We analyze such fluctuations by means of a statistical
mechanics approach and we show that these anomalies are associated to sharp
variations in a generalized thermodynamical variable which is the analogous for
these a-thermal systems to the specific heat in thermal systems.


title: Some Enigmatic Aspects of the Early Universe II

abstract:
  In a recent paper it was suggested that inclusion of mutual gravitational
interactions among the collapsing particles can avert a singularity and give
finite value for various physical quantities. In this paper we extend this idea
further by the inclusion of charge and spin to the system. We have also
discussed other possible scenarios by which the singular state can be averted,
including a temperature dependent gravitational constant. Also possible
modifications in the Einstein-Hilbert action have been discussed, which can
again lead to a finite maximal curvature hence avoiding a singularity.


title: Isometry types of profinite groups

abstract:
  Let T be a rooted tree and Iso(T) be the group of isometries of T. Using
model-theoretic tools we study closed subgroups G of Iso(T) with respect to the
number of conjugacy classes of Iso(T) having representatives in G.


title:
Electronic Properties Close to Dirac Cone in Two-Dimensional Organic
  Conductor $\alpha$-(BEDT-TTF)$_2$I$_3$

abstract:
  A zero-gap state (ZGS) has been found in a bulk system of two-dimensional
organic conductor, $\alpha$-(BEDT-TTF)$_2$I$_3$ salt which consists of four
sites of donor molecules in a unit cell. In the present paper, the
characteristic of the ZGS is analyzed in detail and the electronic properties
are examined in the vicinity of the contact point where the conduction and
valence bands degenerate to form the zero-gap. The eigenvectors of the energy
band have four components of respective sites, where two of them correspond to
inequivalent sites and the other two correspond to equivalent sites. It is
shown that the former exhibits an exotic momentum dependence around the contact
point and the latter shows almost a constant dependence. The density of states
of each site close to the Fermi point is calculated to demonstrate the
temperature dependence of the local magnetic susceptibility and the local
nuclear magnetic relaxation rate. Further, the robust property of the ZGS
against the anion potential is also shown by using the second-order
perturbation.


title: On a Non-Standard Stochastic Control Problem

abstract:
  This paper considers the Merton portfolio management problem. We are
concerned with non-exponential discounting of time and this leads to time
inconsistencies of the decision maker. Following Ekeland and Pirvu 2006, we
introduce the notion of equilibrium policies and we characterize them by an
integral equation. The main idea is to come up with the value function in this
context. If risk preferences are of CRRA type, the integral equation which
characterizes the value function is shown to have a solution which leads to an
equilibrium policy. This work is an extension of Ekeland and Pirvu 2006.


title: Infinite sequence of fixed point free pseudo-Anosov homeomorphisms

abstract:
  We construct infinite sequences of pseudo-Anosov homeomorphisms without fixed
points and leaving invariant a sequence of orientable measured foliations on
the same topological surface and the same stratum of the space of abelian
differentials. The existence of such sequences show that all pseudo-Anosov
homeomorphisms fixing orientable measured foliations cannot be obtained by the
Rauzy-Veech induction strategy.


title:
Cavity Soliton Laser based on mutually coupled semiconductor
  microresonators

abstract:
  We report on experimental observation of localized structures in two mutually
coupled broad-areahttp://hal.archives-ouvertes.fr/images/calendar.gif
semiconductor resonators. These structures coexist with a dark homogeneous
background and they have the same properties as cavity solitons without
requiring the presence of a driving beam into the system. They can be switched
individually on and off by means of a local addressing beam.


title:
Lambda(1405,1/2^-) photoproduction from the gamma p -> K^+ Lambda(1405)
  reaction

abstract:
  We investigate the photoproduction of Lambda(1405,1/2^-) = Lambda* off the
proton target using the effective Lagrangian in the Born approximation. We
observed that, depending on the choice of the K* N Lambda* coupling strength,
the total cross section becomes 0.1 <~ sigma_Lambda* <~ 0.2 mu b near the
threshold and starts to decrease beyond E_gamma ~ 1.6 GeV, and the angular
dependence shows a mild enhancement in the forward direction. It turns out that
the energy dependence of the total cross section is similar to that shown in
the recent LEPS experiment. This suggests that the production mechanism of the
Lambda* is dominated by the s-channel contribution.


title: On spin 2 electromagnetic interactions

abstract:
  In this paper we (re)consider the problem of electromagnetic interactions for
massless spin 2 particles and show that in $(A)dS$ spaces with non-zero
cosmological constant it is indeed possible (at least in linear approximation)
to switch on minimal electromagnetic interactions supplemented by third
derivative non-minimal ones which are necessary to restore gauge invariance.


title: On Unitary Representations of GL2n Distinguished by the Symplectic Group

abstract:
  We provide a family of representations of GL(2n) over a p-adic field that
admit a non-vanishing linear functional invariant under the symplectic group
(i.e. representations that are Sp(2n)- distinguished). While our result
generalizes a result of M. Heumos and S. Rallis our methods, unlike their
purely local technique, re- lies on the theory of automorphic forms. The
results of this paper together with later works by the authors imply that the
family of representations studied in this paper contains all irreducible,
unitary representations of the general linear group that are distin- guished by
the symplectic group.


title:
Electric and magnetic response to the continuum for A=7 isobars in a
  dicluster model

abstract:
  Mirror isobars $^7$Li and $^7$Be are investigated in a dicluster model. The
magnetic dipole moments and the magnetic dipole response to the continuum are
calculated in this framework. The magnetic contribution is found to be small
with respect to electric dipole and quadrupole excitations even at
astrophysical energies, at a variance with the case of deuteron. Energy
weighted molecular sum rules are evaluated and a formula for the molecular
magnetic dipole sum rule is found which matches the numerical calculations.
Cross-sections for photo-dissociation and radiative capture as well as the
S-factor for reactions of astrophysical significance are calculated with good
agreement with known experimental data.


title:
Photons from jet - plasma interaction in relativistic heavy ion
  collisions

abstract:
  We expose the role of collisional energy loss on high $p_T$ photon data
measured by PHENIX collaboration by calculating photon yield in jet plasma
interaction. The phase space distribution of the participating jet is
dynamically evolved by solving Fokker-Planck equation. It is shown that the
data is reasonably well reproduced when contributions from all the relevant
sources are taken into account. Predictions at higher beam energies relevant
for LHC experiment have been made.


title: Data linkage dynamics with shedding

abstract:
  We study shedding in the setting of data linkage dynamics, a simple model of
computation that bears on the use of dynamic data structures in programming.
Shedding is complementary to garbage collection. With shedding, each time a
link to a data object is updated by a program, it is determined whether or not
the link will possibly be used once again by the program, and if not the link
is automatically removed. Thus, everything is made garbage as soon as it can be
viewed as garbage. By that, the effectiveness of garbage collection becomes
maximal.


title: Photon generation from vacuum in non-stationary circuit QED

abstract:
  We study theoretically the non-stationary circuit QED system in which the
artificial atom transition frequency has a small periodic modulation in time,
prescribed externally. We show that, in the dispersive regime, when the
modulation periodicity meets the `resonances', the dynamics may be described by
the dynamical Casimir effect, Jaynes-Cummings or Anti-Jaynes-Cummings effective
Hamiltonians. In the resonant atom-cavity regime, under the modulation
`resonance' the dynamics resembles the behavior of the dynamical Casimir effect
in a vibrating cavity containing a resonant two-level atom, and entangled
states with two photons can be created from vacuum. Thus, an analog of the
dynamical Casimir effect may be simulated in circuit QED, and several photons,
as well as entangled states, can be generated from vacuum due to the
anti-rotating term in the Rabi Hamiltonian.


title: On Some properties of Di-hadronic states

abstract:
  The binding energies of di- hadronic states have been calculated assuming a
'molecular' interaction provided by the asymptotic expression of the residual
confined gluon exchange potential between the component hadrons in the system.
Meson- meson and meson- baryon states have been studied in detail and a mass
formula has been used to calculate total mass of the 'molecules'.


title: Subwavelength Diffraction Management

abstract:
  We study light propagation in nanoscale periodic structures composed of
dielectric and metal in the visible range. We demonstrate that diffraction can
be tailored both in magnitude and in sign by varying the geometric features of
the waveguides. Diffraction management on a subwavelength scale is demonstrated
by numerical solution of Maxwell equations in frequency domain.


title:
The infrared emission spectra of compositionally inhomogeneous
  aggregates composed of irregularly shaped constituents

abstract:
  In order to deduce properties of dust in astrophysical environments where
dust growth through aggregation is important, knowledge of the way aggregated
particles interact with radiation, and what information is encoded in the
thermal radiation they emit, is needed. The emission characteristics are
determined by the size and structure of the aggregate and the composition and
shape of the constituents. We thus aim at performing computations of
compositionally inhomogeneous aggregates composed of irregularly shaped
constituents. In addition we aim at developing an empirical recipe to compute
the optical properties of such aggregates in a fast and accurate manner. We
performed CDA computations for aggregates of irregularly shaped particles with
various compositions. The constituents of the aggregate are assumed to be in
the Rayleigh regime, and in addition we assume that the dominant interaction of
the aggregate constituents is through dipole-dipole interactions. We computed
the spectral structure of the emission efficiency in the 10 micron region for
aggregates with 30% amorphous carbon and 70% silicates by volume with various
fractions of crystalline and amorphous components. We find that the spectral
appearance of the various components of the aggregate are very different and
depend on their abundances. Most notably, materials that have a very low
abundance appear spectroscopically as if they were in very small grains, while
more abundant materials appear, spectroscopically to reside in larger grains.
We construct a fast empirical approximate method, based on the idea of an
effective medium approximation, to construct the spectra for these aggregates
which almost perfectly reproduces the more exact computations. This new method
is fast enough to be easily implemented in fitting procedures.


title: Virasoro 3-algebra from scalar densities

abstract:
  It is shown that the ternary Virasoro-Witt algebra of Curtright, Fairlie and
Zachos can be constructed by applying the Nambu commutator to the vect(1)
realization on scalar densities. This construction is generalized to vect(d),
but the corresponding 3-algebra fails to close.


title:
New Constraints on Radiative Decay of Long-Lived Particles in Big Bang
  Nucleosynthesis with New $^4$He Photodisintegration Data

abstract:
  A recent measurement of $^4$He photodisintegration reactions,
$^4$He($\gamma$,$p$)$^3$H and $^4$He($\gamma$,$n$)$^3$He with laser-Compton
photons shows smaller cross sections than those estimated by other previous
experiments at $E_\gamma \lesssim 30$ MeV. We study big-bang nucleosynthesis
with the radiative particle decay using the new photodisintegration cross
sections of $^4$He as well as previous data. The sensitivity of the yields of
all light elements D, T, $^3$He, $^4$He, $^6$Li, $^7$Li and $^7$Be to the cross
sections is investigated. The change of the cross sections has an influence on
the non-thermal yields of D, $^3$He and $^4$He. On the other hand, the
non-thermal $^6$Li production is not sensitive to the change of the cross
sections at this low energy, since the non-thermal secondary synthesis of
$^6$Li needs energetic photons of $E_\gamma \gtrsim 50$ MeV. The non-thermal
nucleosynthesis triggered by the radiative particle decay is one of candidates
of the production mechanism of $^6$Li observed in metal-poor halo stars
(MPHSs). In the parameter region of the radiative particle lifetime and the
emitted photon energy which satisfies the $^6$Li production above the abundance
level observed in MPHSs, the change of the photodisintegration cross sections
at $E_\gamma \lesssim 30$ MeV as measured in the recent experiment leads to
$\sim 10$% reduction of resulting $^3$He abundance, whereas the $^6$Li
abundance does not change for this change of the cross sections of
$^4$He($\gamma$,$p$)$^3$H and $^4$He($\gamma$,$n$)$^3$He. The $^6$Li abundance,
however, could show a sizable change and therefore the future precise
measurement of the cross sections at high energy $E_\gamma \gtrsim$ 50 MeV is
highly required.


title:
3-D Model of Broadband Emission from Supernova Remnants Undergoing
  Non-linear Diffusive Shock Acceleration

abstract:
  We present a 3-dimensional model of supernova remnants (SNRs) where the
hydrodynamical evolution of the remnant is modeled consistently with nonlinear
diffusive shock acceleration occuring at the outer blast wave. The model
includes particle escape and diffusion outside of the forward shock, and
particle interactions with arbitrary distributions of external ambient
material, such as molecular clouds. We include synchrotron emission and
cooling, bremsstrahlung radiation, neutral pion production, inverse-Compton
(IC), and Coulomb energy-loss. Boardband spectra have been calculated for
typical parameters including dense regions of gas external to a 1000 year old
SNR. In this paper, we describe the details of our model but do not attempt a
detailed fit to any specific remnant. We also do not include magnetic field
amplification (MFA), even though this effect may be important in some young
remnants. In this first presentation of the model we don't attempt a detailed
fit to any specific remnant. Our aim is to develop a flexible platform, which
can be generalized to include effects such as MFA, and which can be easily
adapted to various SNR environments, including Type Ia SNRs, which explode in a
constant density medium, and Type II SNRs, which explode in a pre-supernova
wind. When applied to a specific SNR, our model will predict cosmic-ray spectra
and multi-wavelength morphology in projected images for instruments with
varying spatial and spectral resolutions. We show examples of these spectra and
images and emphasize the importance of measurements in the hard X-ray, GeV, and
TeV gamma-ray bands for investigating key ingredients in the acceleration
mechanism, and for deducing whether or not TeV emission is produced by IC from
electrons or neutral pions from protons.


title: Deconvolution with Shapelets

abstract:
  We seek to find a shapelet-based scheme for deconvolving galaxy images from
the PSF which leads to unbiased shear measurements. Based on the analytic
formulation of convolution in shapelet space, we construct a procedure to
recover the unconvolved shapelet coefficients under the assumption that the PSF
is perfectly known. Using specific simulations, we test this approach and
compare it to other published approaches. We show that convolution in shapelet
space leads to a shapelet model of order $n_{max}^h = n_{max}^g + n_{max}^f$
with $n_{max}^f$ and $n_{max}^g$ being the maximum orders of the intrinsic
galaxy and the PSF models, respectively. Deconvolution is hence a
transformation which maps a certain number of convolved coefficients onto a
generally smaller number of deconvolved coefficients. By inferring the latter
number from data, we construct the maximum-likelihood solution for this
transformation and obtain unbiased shear estimates with a remarkable amount of
noise reduction compared to established approaches. This finding is
particularly valid for complicated PSF models and low $S/N$ images, which
renders our approach suitable for typical weak-lensing conditions.


title: Index Theory for Coverings

abstract:
  We establish the basics of the analysis of operators on coverings of
manifolds with cylindrical ends with a group of deck transformations $\Gamma$.
We prove the $\Gamma$-analogue of the Atiyah-Patodi-Singer formula for Dirac
operators on such coverings.


title: M-Theory Superalgebra From Multiple Membranes

abstract:
  We investigate space-time supersymmetry of the model of multiple M2-branes
proposed by Bagger-Lambert and Gustavsson. When there is a central element in
Lie 3-algebra, the model possesses an extra symmetry shifting the fermions in
the central element. Together with the original worldvolume supersymmetry
transformation, we construct major part of the eleven dimensional space-time
super-Poincar\'{e} algebra with central extensions. Implications to transverse
five-branes in the matrix model for M-theory are also discussed.


title: Invariant tensors and cellular categories

abstract:
  Let U be the quantised enveloping algebra associated to a Cartan matrix of
finite type. Let W be the tensor product of a finite list of highest weight
representations of U. Then the centraliser algebra of W has a basis called the
dual canonical basis which gives an integral form. We show that this integral
form is cellular by using results due to Lusztig.


title:
Fundamentals of Non-relativistic Collisionless Shock Physics: V.
  Acceleration of Charged Particles

abstract:
  A comprehensive review is given of the various processes proposed for
accelerating particles by shocks to high energies. These energies are limited
by several bounds: the non-relativistic nature of the heliospheric
collisionless shocks to which this review restricts, the finite size of these
shocks, the finite width of the downstream region, and to the nature of
turbulence. In general, collisionless shocks in the heliosphere cannot
accelerate particles to very high energies. As a fundamental problem of the
acceleration mechanism the injection of see particles is identified. Some
mecchanisms for production of seed particles are invoked. Acceleration of
electrons begins to uncover its nature. The following problems are covered in
this chapter: 1. Introduction -- first and second order Fermi acceleration, 2.
Accelerating ions when they are already fast, diffusive acceleration,
convection diffusion equation, Lee's self-consistent quasilinear shock
acceleration model, 3. Observations, 4. The injection problem, ion surfing,
test particle simulations, self-consistent shock acceleration simulations,
downstream leakage, trapped particle acceleration, 5. Accelerating electrons,
Sonnerup-Wu mechanism, Hoshino's electron shock surfing on quasi-perpendicular
shocks, quasiparallel shock surfing.


title: Anomalous Anisotropic Magnetoresistance in Heavy-Fermion PrFe4P12

abstract:
  We have investigated the anisotropy of the magnetoresistance in the Pr-based
HF compound PrFe4P12. The large anisotropy of effective mass and its strong
field dependence have been confirmed by resistivity measurements. Particularly
for H||[111], where the effective mass is most strongly enhanced, the non-Fermi
liquid behavior has been observed. Also, we have found the angular dependence
of the magnetoresistance sharply enhanced at H||[111], which is evidently
correlated with both the non-Fermi liquid behavior and the high-field ordered
state (B-phase).


title:
About the maximal rank of 3-tensors over the real and the complex number
  field

abstract:
  High dimensional array data, tensor data, is becoming important in recent
days. Then maximal rank of tensors is important in theory and applications. In
this paper we consider the maximal rank of 3 tensors. It can be attacked from
various viewpoints, however, we trace the method of Atkinson-Stephens(1979) and
Atkinson-Lloyd(1980). They treated the problem in the complex field, and we
will present various bounds over the real field by proving several lemmas and
propositions, which is real counterparts of their results.


title:
The radii of the nearby K5V and K7V stars 61 Cyg A & B - CHARA/FLUOR
  interferometry and CESAM2k modeling

abstract:
  Context: The main sequence binary star 61 Cyg (K5V+K7V) is our nearest
stellar neighbour in the northern hemisphere. This proximity makes it a
particularly well suited system for very high accuracy interferometric radius
measurements. Aims: Our goal is to constrain the poorly known evolutionary
status and age of this bright binary star. Methods: We obtained high accuracy
interferometric observations in the infrared K' band, using the CHARA/FLUOR
instrument. We then computed evolutionary models of 61 Cyg A & B with the
CESAM2k code. As model constraints, we used a combination of observational
parameters from classical observation methods (photometry, spectroscopy) as
well as our new interferometric radii. Results: The measured limb darkened disk
angular diameters are theta_LD(A) = 1.775 +/- 0.013 mas and theta_LD(B) = 1.581
+/- 0.022 mas, respectively for 61 Cyg A and B. Considering the high accuracy
parallaxes available, these values translate into photospheric radii of R(A) =
0.665 +/- 0.005 Rsun and R(B) = 0.595 +/- 0.008 Rsun. The new radii constrain
efficiently the physical parameters adopted for the modeling of both stars,
allowing us to predict asteroseismic frequencies based on our best-fit models.
Conclusions: The CESAM2k evolutionary models indicate an age around 6 Gyrs and
are compatible with small values of the mixing length parameter. The
measurement of asteroseismic oscillation frequencies in 61 Cyg A & B would be
of great value to improve the modeling of this important fiducial stellar
system, in particular to better constrain the masses.


title:
On the Quantization Procedure in Classical Mechanics and Problem of
  Hidden Variables in Bohmian Mechanics

abstract:
  Basing on the Chetaev's theorem on stable trajectories in dynamics in the
presence of dissipative forces we obtain a generalized stability condition for
Hamiltonian systems that has the form of the Schrodinger equation. We show that
the energy of the dissipative forces generating generalized Chetaev's stability
condition exactly coincides with Bohm's "quantum" potential. Using the
principle of least action of perturbation we prove that the Bohmian quantum
mechanics complemented with the Chetaev's generalized theorem does not have
hidden variables.


title: Mean Field and the Single Homopolymer

abstract:
  We develop a statistical model for a confined chain molecule based on a
monomer grand canonical ensemble. The molecule is subject to an external
chemical potential, a backbone interaction, and an attractive interaction
between all monomers. Using a Gaussian variable formalism and a mean field
approximation, we analytically derive a minimum principle from which we can
obtain relevant physical quantities, such as the monomer density, and we
explore the limit in which the chain is subject to a tight confinement. Through
a numerical implementation of the minimization process we show how we can
obtain density profiles in three dimensions for arbitraty potentials, and we
test the limits of validity of the theory.


title: Herleitung von Skalarprodukten aus Symmetrieprinzipien

abstract:
  This is an attempt to model ambient space as a three-dimensional real affine
space with a distinguished group of automorphisms containing the translations
and acting freely and transitively on pairs consisting of a half-plane together
with a half-line on its boundary. From there the existence of an invariant
scalar product is deduced, which then also implies Pythagoras theorem in a
quite precise form. This is in contrast to the usual procedure to model ambient
space by asking for a distinguished scalar product and using Pythagoras theorem
as known from high school to connect with reality.


title: Line Structure in the Spectrum of FU Orionis

abstract:
  New high-resolution spectra of FU Ori, obtained with the HIRES spectrograph
at the Keck I telescope in 2003-2006, make it possible to compare the optical
line profiles with those predicted by the self-luminous accretion disk model. A
dependence of line width on excitation potential and on wavelength, expected
for a Keplerian disk, is definitely not present in the optical region, nor is
the line duplicity due to velocity splitting. The absorption lines observed in
the optical region of FU Ori must originate in or near the central object, and
here their profiles are shown to be those expected of a rigidly rotating
object. They can be fitted by a rapidly rotating (v sin i = 70 km/s)
high-luminosity G-type star having a large dark polar spot, with axis inclined
toward the line of sight. Over these years, the radial velocity of FU Ori has
remained constant to within +/-0.3 km/s, so there is no indication that the
star is a spectroscopic binary. These results apply to the optical region
($\lambda< 8800$ \AA); more distant, cooler regions of the disk contribute in
the infrared.


title: Mackey functors and bisets

abstract:
  For any finite group G, we define a bivariant functor from the Dress category
of finite G-sets to the conjugation biset category, whose objects are subgroups
of G, and whose morphisms are generated by certain bifree bisets. Any additive
functor from the conjugation biset category to abelian groups yields a Mackey
functor by composition. We characterize the Mackey functors which arise in this
way.


title:
Hardening-softening transition in Fe-doped Pb(Zr,Ti)O3 ceramics and
  evolution of the third harmonic of the polarization response

abstract:
  It is shown that the phase angle of the third harmonic of polarization
response (delta3) is very sensitive to the ageing state of hard, Fe-doped lead
zirconate titanate [Pb(Zr,Ti)O3 or PZT] ceramics and may thus provide rich
information on processes responsible for ageing in hard ferroelectrics. When
hard PZT ceramics experience hardening (aged state) - softening (deaged state)
transition, delta3 changes by about 90 degrees at subswitching fields and by
about 180 degrees at switching conditions. Evolution of delta3 with time,
temperature and electric field amplitude during deageing suggests that at least
two mechanisms of charge migration, one short-range and one long-range, may
participate in the deageing process.


title: Selective epitaxial growth of graphene on SiC

abstract:
  We present an innovative method of selective epitaxial growth of few layers
graphene (FLG) on a pre-patterned SiC substrate. The methods involves,
successively, the sputtering of a thin AlN layer on top of a mono-crystalline
SiC substrate and, then, patterning it with e-beam lithography (EBL) and wet
etching. The sublimation of few atomic layers of Si from the SiC substrate
occurs only through the selectively etched AlN layer. The presence of the Raman
G-band at ~1582 cm-1 in the AlN-free areas is used to validate the concept, it
gives absolute evidence of the selective FLG growth.


title: Lower bound for the remainder in the prime-pair conjecture

abstract:
  For any positive integer r, let pi_{2r}(x) denote the number of prime pairs
(p, p+2r) with p not exceeding (large) x. According to the prime-pair
conjecture of Hardy and Littlewood, pi_{2r}(x) should be asymptotic to
2C_{2r}li_2(x) with an explicit positive constant C_{2r}. A heuristic argument
indicates that the remainder e_{2r}(x) in this approximation cannot be of lower
order than x^beta, where beta is the supremum of the real parts of zeta's
zeros. The argument also suggests an approximation for pi_{2r}(x) similar to
one of Riemann for pi(x).


title: Nonlinear Connections and Description of Photon-like Objects

abstract:
  This paper aims to present a general idea for description of spatially finite
physical objects with a consistent nontrivial translational-rotational
dynamical structure and evolution as a whole, making use of the mathematical
concepts and structures connected with the Frobenius
integrability/nonintegrability theorems given in terms of distributions on
manifolds with corresponding curvature defined by the Nijenhuis operator. The
idea is based on consideration of {\it nonintegrable} subdistributions of some
appropriate completely integrable distribution (differential system) on a
manifold and then to make use of the corresponding curvatures as generators of
measures of interaction, i.e. of energy-momentum exchange among the physical
subsystems mathematically represented by the nonintegrable subdistributions.
The concept of photon-like object is introduced and description of such objects
in these terms is given.


title: Gravitational lensing by wormholes

abstract:
  We have investigated the gravitational lensing by two wormholes, viz.,
Janis-Newman-Winnicour (JNW) wormhole and Ellis wormhole. The deflection angle
in the strong field limit is calculated and various lens parameters of two
wormholes are compared. It is shown that the JNW wormhole exhibits the
relativistic images, while the Ellis wormhole does not have any relativistic
images due to the absence of its photon sphere.


title:
Continuous corrections to the molecular Kohn-Sham gap and virtual
  orbitals

abstract:
  We use projector operators to correct the Kohn-Sham Hamiltonian of density
functional theory (KS-DFT) so that the resulting mean-field scheme yields, in
finite systems, virtual orbitals and energy gaps in better agreement with those
predicted by quasiparticle theory. The proposed correction term is a
scissors-like operator of the form $(\hat{I}-\hat{\rho})\delta
\hat{H}(\hat{I}-\hat{\rho})$, where $\hat{I}$ is the identity operator,
$\hat{\rho}$ the density matrix of the N-particle system and $\delta \hat{H}$
is either the difference between the N+1- and N-particle Kohn-Sham Hamiltonians
or a non-self-consistent approximation to it. Such a term replaces the
Kohn-Sham virtual orbitals of the $N$-particle system by the HOMO and virtual
orbitals of the system with $N+1$ particles in an attempt to mimic a true
quasiparticle spectrum. Using a local density approximation (LDA) we compute
the gaps of a variety of small molecules finding good agreement with experiment
and computationally more demanding methods. For these systems we examine the
physical origin of this gap correction and show that so-called band gap
discontinuity, $\Delta_{xc}$, contains electrostatic contributions that do not
originate from the discontinuity in the exchange-correlation potential. The
similarity between the corrected and Hartree-Fock virtual orbitals is
illustrated and the extent to which the bare LDA virtual orbitals are improved
is considered. The lack of band-gap discontinuity and the presence of
self-interaction errors in the proposed correction are also discussed.


title:
An explicit solution for an optimal stopping/optimal control problem
  which models an asset sale

abstract:
  In this article we study an optimal stopping/optimal control problem which
models the decision facing a risk-averse agent over when to sell an asset. The
market is incomplete so that the asset exposure cannot be hedged. In addition
to the decision over when to sell, the agent has to choose a control strategy
which corresponds to a feasible wealth process. We formulate this problem as
one involving the choice of a stopping time and a martingale. We conjecture the
form of the solution and verify that the candidate solution is equal to the
value function. The interesting features of the solution are that it is
available in a very explicit form, that for some parameter values the optimal
strategy is more sophisticated than might originally be expected, and that
although the setup is based on continuous diffusions, the optimal martingale
may involve a jump process. One interpretation of the solution is that it is
optimal for the risk-averse agent to gamble.


title: Dynamics of Vortex Pair in Radial Flow

abstract:
  The problem of vortex pair motion in two-dimensional plane radial flow is
solved. Under certain conditions for flow parameters, the vortex pair can
reverse its motion within a bounded region. The vortex-pair translational
velocity decreases or increases after passing through the source/sink region,
depending on whether the flow is diverging or converging, respectively. The
rotational motion of two corotating vortexes in a quiescent environment
transforms into motion along a logarithmic spiral in the presence of radial
flow. The problem may have applications in astrophysics and geophysics.


title: Massive star evolution: from the early to the present day Universe

abstract:
  Mass loss and axial rotation are playing key roles in shaping the evolution
of massive stars. They affect the tracks in the HR diagram, the lifetimes, the
surface abundances, the hardness of the radiation field, the chemical yields,
the presupernova status, the nature of the remnant, the mechanical energy
released in the interstellar medium, etc... In this paper, after recalling a
few characteristics of mass loss and rotation, we review the effects of these
two processes at different metallicities. Rotation probably has its most
important effects at low metallicities, while mass loss and rotation deeply
affect the evolution of massive stars at solar and higher than solar
metallicities.


title: Decomposition of phase space and classification of Heisenberg groups

abstract:
  Is every locally compact abelian group which admits a Heisenberg central
extension isomorphic to the product of a locally compact abelian group and its
Pontryagin dual? An affirmative answer is obtained for all the commonly
occurring types of abelian groups having Heisenberg central extensions,
including Lie groups and certain finite Cartesian products of local fields and
adeles. Furthermore, for these types of groups, it is found that the
isomorphism class of the abelian group determines the Heisenberg group up to
isomorphism, thereby providing a classification of such Heisenberg groups.


title: Modulated Inflation (@SUSY08)

abstract:
  We consider cosmological perturbations caused by modulated inflaton velocity.
During inflation, the inflaton motion is damped and the velocity is determined
by the parameters such as couplings or masses that may depend on light
fields(moduli). The number of e-foldings is different in different patches if
there are spatial fluctuations of such parameters. Based on this simple idea,
we consider ``modulated inflation'' in which the curvature perturbation is
generated by the fluctuation of the inflaton velocity. This talk is based on
our recent papers.


title:
Structure and photo-induced volume changes of obliquely deposited
  amorphous selenium

abstract:
  Atomic scale computer simulations on structures and photo induced volume
changes of flatly and obliquely deposited amorphous selenium films have been
carried out in order to understand how the properties of chalcogenide glasses
are influenced by their preparation method. Obliquely deposited a-Se thin films
contain more coordination defects, larger voids than the flatly deposited ones.
To model the photo induced volume changes the electron excitation and hole
creation were treated independently within the framework of tight-binding
formalism. Covalent and interchain bond breakings and formations were found.
The obliquely deposited samples containing voids showed a wide spectrum of
photo induced structural changes in microscopic and volume changes in
macroscopic levels.


title: Heat conduction in the disordered Fermi-Pasta-Ulam chain

abstract:
  We address the question of the effect of disorder on heat conduction in an
anharmonic chain with interactions given by the Fermi-Pasta-Ulam (FPU)
potential. In contrast to the conclusions of an earlier paper [Phys. Rev. Lett.
86, 63 (2001)] which found that disorder could induce a finite thermal
conductivity at low temperatures, we find no evidence of a finite temperature
transition in conducting properties. Instead, we find that at low temperatures,
small system size transport properties are dominated by disorder but the
asymptotic system size dependence of current is given by the usual FPU result J
~ 1/N^{2/3}. We also present new interesting results on the binary-mass ordered
FPU chain.


title: A Non-Supersymmetric Large-N 3D CFT And Its Gravity Dual

abstract:
  We propose a three dimensional non-supersymmetric theory that is conformal in
the large N limit. In a certain well defined bosonic sub-sector of gauge
invariant operators, this theory is planar equivalent to the theory recently
proposed by Aharony, Bergman, Jafferis and Maldacena as the theory on multiple
M2 branes at an orbifold singularity. We discuss the realization of the theory
on a brane configuration of type 0B string theory. Moreover, we propose an 11D
gravity dual, obtained by a projection of M-theory on AdS4 x S7 / Z_k.


title: Contest dynamics general biomechanical theory of contest sports

abstract:
  In this report it is approched the Contest dynamics as mathematical theory,
therefore applicable to all contest sports. Starting with the physical
definition of Athlete and Couple of Athlete systems and after singling out the
interaction basic parameter, there are analyzed the classes of possible
potentials describing the interaction. At the end there are specified the
physical bases of mutual interaction between athletes and the trajectories of
flight motion. All the matter will be connected to measurable quantities or
parameters useful for researchers and trainers.


title: Beam-Beam Resonances for Different Collision Schemes

abstract:
  One of the main advantages of proposed by P. Raimondi "Crab Waist" collision
scheme is a strong suppression of betatron resonances excited by beam-beam
interaction. Some qualitative explanations with numerical examples, describing
beam-beam resonances for different collision schemes, were given in
arXiv:physics/0702033. This paper can be considered as an "appendix"
(additional illustration) to that one. We performed a number of full 2D
betatron tune scans (beam-beam simulations) for different collision schemes, so
one can easily see how the beam-beam resonances appear and disappear, depending
on the colliding conditions.


title: New $\beta$ Model of Intracluster Gas Distribution

abstract:
  A new type of $\beta$ model of intracluster gas distribution is established,
which is well fitted to the observed X-ray surface brightness profile except
for outermost region. It employs the exact King model of the self-gravitating
system of collisionless particles instead of the widely used approximated
analytical formula for the dark matter distribution. The small difference
between the modelled and the observed X-ray surface brightness profiles would
disappear if the infall of matter from the intercluster space is taken into
account. The number of parameters of our model is the same as for the
isothermal $\beta$ model, but the agreement between our model and data points
is satisfactory even when the fitting with the isothermal $\beta$ model remains
a large central excess. In addition, the enhanced central mass concentration in
our model is high enough to resolve the discrepancy between the X-ray and the
lensing measurements of cluster mass. These facts suggest that most of the
central excess might be no more than a ghost embossed by an inadequate fitting.
Therefore the central excess would not necessarily be linked to the existence
of cooling flow. It is also shown that the obtained values of $\beta$ (our
model) ~ 0.5 support the theory of non-gravitational intracluster gas heatings
comparable to those reached through gravitational collapse. On the other hand,
the value of $\beta$ ~ 0.6 obtained for the isothermal $\beta$ model is
explained as showing the scarcity of matter in the space surrounding each
cluster, brobably due to the infall of matter towards it over a long time.


title:
Semileptonic hyperon decays in the self-consistent SU(3) chiral
  quark-soliton model

abstract:
  We investigate the semileptonic hyperon decays within the framework of the
self-consistent SU(3) chiral quark-soliton model ($\chi$QSM). We take linear
$1/N_c$ rotational as well as linear $m_s$ corrections into account and apply
the symmetry conserving quantization. We present the results for the form
factors $f_1(Q^2)$, $f_2(Q^2)$ and $g_1(Q^2)$ in addition to the semileptonic
decay constants of hyperons. We also have calculated the radii and dipole
masses of these form factors for all relevant strangeness-conserving and
strangeness-changing transitions.


title:
A comparison of two approaches for polynomial time algorithms computing
  basic graph parameters

abstract:
  In this paper we compare and illustrate the algorithmic use of graphs of
bounded tree-width and graphs of bounded clique-width. For this purpose we give
polynomial time algorithms for computing the four basic graph parameters
independence number, clique number, chromatic number, and clique covering
number on a given tree structure of graphs of bounded tree-width and graphs of
bounded clique-width in polynomial time. We also present linear time algorithms
for computing the latter four basic graph parameters on trees, i.e. graphs of
tree-width 1, and on co-graphs, i.e. graphs of clique-width at most 2.


title:
Morphology and flexibility of graphene and few-layer graphene on various
  substrates

abstract:
  We report on detailed microscopy studies of graphene and few-layer-graphene
produced by mechanical exfoliation on various semi-conducting substrates. We
demonstrate the possibility to prepare and analyze graphene on (001)-GaAs,
manganese p-doped (001)-GaAs and InGaAs substrates. The morphology of graphene
on these substrates was investigated by scanning electron and atomic force
microscopy and compared to layers on silicon oxide. It was found that graphene
sheets strongly follow the texture of the sustaining substrates independent on
doping, polarity or roughness. Furthermore resist residues exist on top of
graphene after a lithographic step. The obtained results provide the
opportunity to research the graphene-substrate interactions.


title:
A new analysis of PP --> bblvjj at the LHC: Higgs and W boson associated
  production with two tag jets

abstract:
  Higgs production in association with a $W$ boson and two energetic tag jets
at the LHC is studied for $M_H = 120$ \GeV, with the Higgs decaying to
$b\bar{b}$ and the $W$ to $\ell\nu$ ($\ell = e, \mu$), guaranteeing high
trigger efficiency. All parton level backgrounds are analyzed, including the
effect of fake $b$--tagging. We discuss two detection strategies: in the first,
more traditional, one, two jets are required to be $b$--tagged while in the
second, which has not been previously examined in detail, only one tag is
required. After all selection cuts about 80 and 200 events are foreseen in the
two cases for a standard luminosity of 100 $fb^{-1}$ with a S/B ratio of 1/25
and 1/60 respectively. The corresponding statistical significancies,
S/$\sqrt{\mathrm B}$ are 1.81 and 1.82.


title:
Three fermions with six single particle states can be entangled in two
  inequivalent ways

abstract:
  Using a generalization of Cayley's hyperdeterminant as a new measure of
tripartite fermionic entanglement we obtain the SLOCC classification of
three-fermion systems with six single particle states. A special subclass of
such three-fermion systems is shown to have the same properties as the
well-known three-qubit ones. Our results can be presented in a unified way
using Freudenthal triple systems based on cubic Jordan algebras. For systems
with an arbitrary number of fermions and single particle states we propose the
Pl\"ucker relations as a sufficient and necessary condition of separability.


title: On the number of components of a complete intersection of real quadrics

abstract:
  Our main results concern complete intersections of three real quadrics. We
prove that the maximal number $B^0_2(N)$ of connected components that a regular
complete intersection of three real quadrics in $\Bbb{P}^N$ can have differs at
most by one from the maximal number of ovals of the submaximal depth
$[(N-1)/2]$ of a real plane projective curve of degree $d=N+1$. As a
consequence, we obtain a lower bound \smash{$\frac14 N^2+O(N)$} and an upper
bound \smash{$\frac38 N^2+O(N)$} for $B^0_2(N)$.


title:
Mossbauer Spectroscopy Determination of iron foreign phases in the
  Superconducting Systems; RAsFeO1-x, RAsFeO1-xFx and Sr1-xKxFe2As2

abstract:
  The recently discovered superconducting - spin density wave materials,
containing Fe and As, have raised huge interest. However most materials
prepared to date, suffer from a varying degree of content of foreign Fe-As
phases, Fe2As, FeAs2 and FeAs, which can lead to wrong conclusions concerning
the properties of these materials. We show here that Mossbauer Spectroscopy is
able to determine quite easily the relative content of the foreign phases. This
procedure is demonstrated by a study of seven samples of superconducting or
spin density wave materials, prepared in three different laboratories.


title: Confirming and extending the hypothesis of universality in sandpiles

abstract:
  Stochastic sandpiles self-organize to a critical point with scaling behavior
different from directed percolation (DP) and characterized by the presence of
an additional conservation law. This is usually called C-DP or Manna
universality class. There remains, however, an exception to this universality
principle: a sandpile automaton introduced by Maslov and Zhang, which was
claimed to be in the directed percolation class despite of the existence of a
conservation law. In this paper we show, by means of careful numerical
simulations as well as by constructing and analyzing a field theory, that
(contrarily to what previously thought) this sandpile is also in the C-DP or
Manna class. This confirms the hypothesis of universality for stochastic
sandpiles, and gives rise to a fully coherent picture of self-organized
criticality in systems with a conservation law. In passing, we obtain a number
of results for the C-DP class and introduce a new strategy to easily
discriminate between DP and C-DP scaling.


title: The FORM project

abstract:
  The necessity of the FORM project is discussed. Then the evolutionary needs
in particle physics are considered, looking at the trends over the years. A
guess is made at what will be needed in the (near) future. The whole is
concluded with some critical remarks concerning the publication of results and
programs.


title:
Global well-posedness issues for the inviscid Boussinesq system with
  Yudovich's type data

abstract:
  The present paper is dedicated to the study of the global existence for the
inviscid two-dimensional Boussinesq system. We focus on finite energy data with
bounded vorticity and we find out that, under quite a natural additional
assumption on the initial temperature, there exists a global unique solution.
None smallness conditions are imposed on the data. The global existence issues
for infinite energy initial velocity, and for the B\'enard system are also
discussed.


title: Probing the nature of cosmic acceleration

abstract:
  The cosmic acceleration is one of the most significant cosmological
discoveries over the last century. The two categories of explanation are exotic
component (dark energy) and modified gravity. We constrain the two types of
model by a joint analysis with perturbation growth and direct $H(z)$ data.
Though the minimal $\chi^2$ of the $\Lambda$CDM is almost the same as that of
DGP, in the sense of consistency we find that the dark energy ($\Lambda$CDM)
model is more favored through a detailed comparison with the corresponding
parameters fitted by expansion data.


title:
The Leray and Fujita-Kato theorems for the Boussinesq system with
  partial viscosity

abstract:
  We are concerned with the so-called Boussinesq equations with partial
viscosity. These equations consist of the ordinary incompressible Navier-Stokes
equations with a forcing term which is transported {\it with no dissipation} by
the velocity field. Such equations are simplified models for geophysics (in
which case the forcing term is proportional either to the temperature, or to
the salinity or to the density). In the present paper, we show that the
standard theorems for incompressible Navier-Stokes equations may be extended to
Boussinesq system despite the fact that there is no dissipation or decay at
large time for the forcing term. More precisely, we state the global existence
of finite energy weak solutions in any dimension, and global well-posedness in
dimension $N\geq3$ for small data. In the two-dimensional case, the finite
energy global solutions are shown to be unique for any data in $L^2(\R^2).$


title:
Existence and uniqueness results for the Boussinesq system with data in
  Lorentz spaces

abstract:
  This paper is devoted to the study of the Cauchy problem for the Boussinesq
system with partial viscosity in dimension $N\geq3.$ First we prove a global
existence result for data in Lorentz spaces satisfying a smallness condition
which is at the scaling of the equations. Second, we get a uniqueness result in
Besov spaces with {\it negative} indices of regularity (despite the fact that
there is no smoothing effect on the temperature). The proof relies on a priori
estimates with loss of regularity for the nonstationary Stokes system with
convection. As a corollary, we obtain a global existence and uniqueness result
for small data in Lorentz spaces.


title:
A review of redshift and its interpretation in cosmology and
  astrophysics

abstract:
  This article has been withdrawn by arXiv administrators due to excessive
unattributed and verbatim text overlap with the pre-existing Wikipedia article
on redshift


title:
On the product of two gamma variate with argument 2: Application to the
  luminosity function for galaxies

abstract:
  A new luminosity function for galaxies can be built starting from the product
of two random variables X and Y represented by a gamma variate with argument 2
>. The mean, the standard deviation and the distribution function of this new
distribution are computed. This new probability density function is assumed to
describe the mass distribution of galaxies. Through a non linear rule of
conversion from mass to luminosity a second new luminosity function for
galaxies is derived. The test of reliability of these two luminosity functions
was made on the Sloan Digital Sky Survey (SDSS) in five different bands. The
Schechter function gives a better fit with respect to the two new luminosity
functions for galaxies here derived.


title: Planetesimal Accretion in Binary Systems: The Effects of Gas Dissipation

abstract:
  Currently, one of major problems concerning planet formation theory in close
binary systems is, the strong perturbation from the companion star can increase
relative velocities ($\triangle V$) of planetesimals around the primary and
thus hinder their growth. According to previous studies, while gas drag can
reduce the $\triangle V$ between bodies of the same sizes by forcing orbital
alignment to planetesimals, it increases the $\triangle V$ among bodies of
different sizes. In this paper, focusing on the $\gamma$ Cephei binary system,
we propose a mechanism that can overcome this difficulty. We show that in a
dissipating gas disk (with a typical dissipating timescale of $\sim 10^5-10^6$
years), all the planetesimals eventually converge towards the same forced
orbits regardless of their sizes, leading to much lower impact velocities among
them. These $\triangle V$ decrease processes progressively increase net mass
accretion and even trigger runaway growth for large bodies (radius $>15$ km).
The effect of size distribution of planetesimals is discussed, and found to be
one of the dominant factors that determine the outcome of collisional
evolution. Anyway, it can be concluded that by including the gas dissipation in
the early stage of disk evolution, the conditions for planetesimal accretion
become much better, and the process from planetesimal to planet-embryo can be
carried out in close binary systems like $\gamma$ Cephei.


title:
X-ray hiccups from SgrA* observed by XMM-Newton. The second brightest
  flare and three moderate flares caught in half a day

abstract:
  [truncated] In Spring 2007, we observed SgrA* with XMM with a total exposure
of ~230ks. We have performed timing and spectral analysis of the new X-ray
flares detected during this campaign. To study the range of flare spectral
properties, in a consistent manner, we have also reprocessed, using the same
analysis procedure and the latest calibration, archived XMM data of previously
reported rapid flares. The dust scattering was taken into account during the
spectral fitting. We also used Chandra archived observations of the quiescent
state of SgrA* for comparison. On April 4, 2007, we observed for the first time
within a time interval of ~1/2 day, an enhanced incidence rate of X-ray
flaring, with a bright flare followed by three flares of more moderate
amplitude. The former event represents the second brightest X-ray flare from
Sgr A* on record. This new bright flare exhibits similar light-curve shape
(nearly symmetrical), duration (~3ks) and spectral characteristics to the very
bright flare observed in October 3, 2002. The measured spectral parameters of
the new bright flare, assuming an absorbed power law model taken into account
dust scattering effect, are N_H=12.3(+2.1,-1.8)e22 cm-2 and Gamma~2.3+/-0.3
calculated at the 90% c.l. The spectral parameter fits of the sum of the three
following moderate flares, while lower, are compatible within the error bars
with those of the bright flares. The column density found, for a power-law,
during the flares is at least two times higher than the value expected from the
(dust) visual extinction toward SgrA* (AV~25 mag). However, our fitting of the
SgrA* quiescent spectra obtained with Chandra shows that an excess of column
density is already present during the non-flaring phase. The two brightest
X-ray flares observed so far from SgrA* exhibited similar soft spectra.


title:
Halo masses for optically-selected and for radio-loud AGN from
  clustering and galaxy-galaxy lensing

abstract:
  We compute two-point correlation functions and measure the shear signal due
to galaxy-galaxy lensing for 80,000 optically identified and 5,700 radio-loud
AGN from Data Release 4 (DR4) of the Sloan Digital Sky Survey. Halo occupation
models are used to estimate halo masses and satellite fractions for these two
types of AGN. The large sample size allows us to separate AGN according to the
stellar mass of their host galaxies. We study how the halo masses of optical
and radio AGN differ from those of the parent population at fixed M*. Halo
masses deduced from clustering and from lensing agree satisfactorily. Radio AGN
are found in more massive halos than optical AGN: in our samples their mean
halo masses are 1.6 x 10^{13} and 8 x 10^{11} M_{sun}/h, respectively. Optical
AGN follow the same relation between stellar mass and halo mass as galaxies
selected without regard to nuclear properties, but radio-loud AGN deviate
significantly from this relation. The dark matter halos of radio-loud AGN are
about twice as massive as those of control galaxies of the same stellar mass.
This boost is independent of radio luminosity, and persists even when our
analysis is restricted to field galaxies. The large-scale gaseous environment
of the galaxy clearly plays a crucial role in producing observable radio
emission. The dark matter halo masses that we derive for the AGN in our two
samples are in good agreement with recent models in which feedback from radio
AGN becomes dominant in halos where gas cools quasi-statically.


title: Bright filter-free source of indistinguishable photon pairs

abstract:
  We demonstrate a high-brightness source of pairs of indistinguishable photons
based on a type-II phase-matched doubly-resonant optical parametric oscillator
operated far below threshold. The cavity-enhanced down-conversion output of a
PPKTP crystal is coupled into two single-mode fibers with a mode coupling
efficiency of 58%. The high degree of indistinguishability between the photons
of a pair is demonstrated by a Hong-Ou-Mandel interference visibility of higher
than 90% without any filtering at an instantaneous coincidence rate of 450 000
pairs/s per mW of pump power per nm of down-conversion bandwidth. For the
degenerate spectral mode with a linewidth of 7 MHz at 795 nm a rate of 70
pairs/(s mW MHz) is estimated, increasing the spectral brightness for
indistinguishable photons by two orders of magnitude compared to similar
previous sources.


title: Biomechanical Classification of Judo Throwing Techniques (Nage Waza)

abstract:
  In this paper it is applied the classic mechanical point of view to classify
all the movements known as throwing judo techniques; the application of the
Newtonian physical methods and principles is able to rationalize the whole
matter and to group under only two very simple and clear principles all the
movements, before grouped in many generic and not very clear way.


title: Two-photon width and gluonic component of sigma/f_0(600)

abstract:
  We analyse data on pi pi and gamma gamma scattering below 700 MeV within an
improved analytic K-matrix model. This model is based on an effective theory
with couplings between resonances, hadrons and photons. The two-photon decay of
a resonance can proceed through intermediate transition into charged hadrons
(here: pi^+ pi^-) and their subsequent annihilation or through a ``direct''
transition into photons. Our analysis confirms the rather large total radiative
width of the sigma/f_0(600) resonance which we find as (3.9 \pm 0.6) keV but
suggests its dominance by the pi pi rescattering process. This process is not
sensitive to the internal structure of the resonance contrary to the direct
component which we find small, (0.13 \pm 0.05) keV, and well consistent with
the expectations for an unmixed glueball according to the QCD sum rule
calculations.


title: Hochschild two-cocycles and the good triple $(As,Hoch,Mag^\infty)$

abstract:
  Hochschild two-cocycles play an important role in the deformation \`a la
Gerstenhaber of associative algebras. The aim of this paper is to introduce the
category of Hoch-algebras whose objects are associative algebras equipped with
an extra magmatic operation \succ verifying the Hochschild two-cocycle
relation:
  (x \succ y)*z+ (x*y)\succ z= x\succ (y*z)+ x*(y\succ z).
  The free Hoch-algebra over a K-vector space is given in terms of planar
rooted trees and the triples of operads (As,Hoch, Mag^\infty) endowed with the
infinitesimal relations are shown to be good. We then obtain an equivalence of
categories between connected infinitesimal Hoch-bialgebras and
Mag^\infty-algebras.


title:
On the spectral flow for paths of essentially hyperbolic bounded
  operators on Banach spaces

abstract:
  We give a definition of the spectral flow for paths of bounded essentially
hyperbolic operators on a Banach space. The spectral flow induces a group
homomorphism on the fundamental group of every connected component of the space
of essentially hyperbolic operators. We prove that this homomorphism completes
the exact homotopy sequence of a Serre fibration. This allows us to
characterise its kernel and image and to produce examples of spaces where it is
not injective or not surjective, unlike what happens for Hilbert spaces. For a
large class of paths, namely the essentially splitting, the spectral flow of $
A $ coincides with $ -\ind(F_A) $, the Fredholm index of the differential
operator $ F_A (u) = u' - A u $.


title: Formality of cyclic cochains

abstract: We prove Kontsevich's cyclic formality conjecture.


title: Finding the sum of any series from a given general term

abstract:
  Translation from the Latin original, "Inventio summae cuiusque seriei ex dato
termino generali" (1735). E47 in the Enestrom index. In this paper Euler
derives the Euler-Maclaurin summation formula, by expressing y(x-1) with the
Taylor expansion of y about x. In sections 21 to 23 Euler uses the formula to
find expressions for the sums of the nth powers of the first x integers. He
gives the general formula for this, and works it out explicitly up to n=16. In
sections 25 to 28 he applies the summation formula to getting approximations to
partial sums of the harmonic series, and in sections 29 to 30 to partial sums
of the reciprocals of the odd positive integers. In sections 31 to 32, Euler
gets an approximation to zeta(2); in section 33, approximations for zeta(3) and
zeta(4). I found David Pengelley's paper "Dances between continuous and
discrete: Euler's summation formula", in the MAA's "Euler at 300: An
Appreciation", edited by Robert E. Bradley, Lawrence A. D'Antonio, and C.
Edward Sandifer, very helpful and I recommend it if you want to understand the
summation formula better.


title:
INTEGRAL long-term monitoring of the Supergiant Fast X-ray Transient XTE
  J1739-302

abstract:
  In the past few years, a new class of High Mass X-Ray Binaries (HMXRB) has
been claimed to exist, the Supergiant Fast X-ray Transients (SFXT). These are
X-ray binary systems with a compact companion orbiting a supergiant star which
show very short and bright outbursts in a series of activity periods
overimposed on longer quiescent periods. Only very recently the first attempts
to model the behaviour of these sources have been published, some of them
within the framework of accretion from clumpy stellar winds.Our goal is to
analyze the properties of XTE J1739-302/IGR J17391-3021 within the context of
the clumpy structure of the supergiant wind. We have used INTEGRAL and RXTE/PCA
observations in order to obtain broad band (1-200 keV) spectra and light curves
of XTE J1739-302 and investigate its X-ray spectrum and temporal variability.
We have found that XTE J1739-302 follows a much more complex behaviour than
expected. Far from presenting a regular variability pattern, XTE J1739-302
shows periods of high, intermediate, and low flaring activity.


title:
Observation of two resonance-like structures in the pi+ chi_c1 mass
  distribution in exclusive B0-bar --> K- pi+ chi_c1 decays

abstract:
  We report the first observation of two resonance-like structures in the pi+
chi_c1 invariant mass distribution near 4.1 GeV/c^2 in exclusive B0-bar --> K-
pi+ chi_c1 decays. From a Dalitz plot analysis in which the pi+ chi_c1 mass
structures are represented by Breit-Wigner resonance amplitudes, we determine
masses and widths of: M_1 = (4051 +-14 +20-41) MeV/c^2, Gamma_1 = (82 +21-17
+47-22) MeV, M_2 = (4248 +44-29 +180-35}) MeV/c^2, and Gamma_2 =(177 +54-39
+316-61) MeV; and product branching fractions of BF(B0-bar --> K- Z+_1,2) x
BF(Z+_1,2 --> pi+ chi_c1) = (3.0 +1.5-0.8 +3.7-1.6) x 10^-5 and (4.0 +2.3-0.9
+19.7-0.5) x 10^-5 respectively. Here the first uncertainty is statistical, the
second is systematic. The significance of each of the pi+ chi_c1 structures
exceeds 5 sigma, including the systematic uncertainty from various fit models.
This analysis is based on 657 x 10^6 BB-bar events collected at the Upsilon(4S)
resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.


title:
Interpreting the recent results on direct search for dark matter
  particles in terms of relic neutralino

abstract:
  The most recent results from direct searches for dark matter particles in the
galactic halo are examined in terms of an effective Minimal Supersymmetric
extension of the Standard Model at the electroweak scale without gaugino masses
unification. We show that the annual modulation effect at 8.2 $\sigma$ C.L.
recently presented by the DAMA Collaboration, as the result of a combined
analysis of the DAMA/NaI and the DAMA/LIBRA experiments for a total exposure of
0.82 ton yr, fits remarkably well with what expected for relic neutralinos for
a wide variety of WIMP distribution functions. Bounds derivable from other
measurements of direct searches for dark matter particles are analyzed. We
stress the role played by the uncertainties affecting the neutralino--quark
couplings arising from the involved hadronic quantities. We also examine how
present data on cosmic antiprotons can help in constraining the neutralino
configurations selected by the DAMA effect, in connection with the values of
the astrophysical parameters.
  Perspectives for measurement of antideuterons possibly produced in the
galactic halo by self--annihilation of neutralinos belonging to the DAMA
configurations are examined. Finally, we discuss how findings at LHC would
impact on these issues.


title:
Chemical freeze-out in ultra-relativistic heavy ion collisions at
  sqrt(s)_NN = 130 and 200 GeV

abstract:
  A comprehensive and detailed analysis of hadronic abundances measured in
Au-Au collisions at RHIC at sqrt(s)_NN = 130 and 200 GeV is presented. The
rapidity densities measured in the central rapidity region have been fitted to
the statistical hadronization model and the chemical freeze-out parameters
determined as a function of centrality, using data from experiments BRAHMS,
PHENIX and STAR. The chemical freeze-out temperature turns out to be
independent of centrality to a few percent accuracy, whereas the strangeness
under-saturation parameter gamma_S decreases from almost unity in central
collisions to a significantly lower value in peripheral collisions. Our results
are in essential agreement with previous analyses, with the exception that fit
quality at sqrt(s)_NN = 200 GeV is not as good as previously found. From the
comparison of the two different energies, we conclude that the difference in
fit quality, as described by chi2 values, is owing to the improved resolution
of measurements which has probably exceeded the intrinsic accuracy of the
simplified theoretical formula used in the fits.


title: The Most Luminous Starbursts in the Universe

abstract:
  A summary of starburst luminosities based on PAH features is given for 243
starburst galaxies with 0 < z < 2.5, observed with the Spitzer Infrared
Spectrograph. Luminosity vLv(7.7um) for the peak luminosity of the 7.7um PAH
emission feature is found to scale as log[vLv(7.7um)] = 44.63(+-0.09) +
2.48(+-0.28)log(1+z) for the most luminous starbursts observed. Empirical
calibrations of vLv(7.7um) are used to determine bolometric luminosity Lir and
the star formation rate (SFR) for these starbursts. The most luminous
starbursts found in this sample have log Lir = 45.4(+-0.3) +
2.5(+-0.3)log(1+z), in ergs per s, and the maximum star formation rates for
starbursts in units of solar masses per yr are log(SFR) = 2.1(+-0.3) +
2.5(+-0.3)log(1+z), up to z = 2.5. The exponent for pure luminosity evolution
agrees with optical and radio studies of starbursts but is flatter than
previous results based in infrared source counts. The maximum star formation
rates are similar to the maxima determined for submillimeter galaxies; the most
luminous individual starburst included within the sample has log Lir = 46.9,
which gives a SFR = 3400 solar masses per yr.


title: Optical caustics of Kerr spacetime: the full structure

abstract:
  We present an exhaustive numerical investigation of the optical caustics in
gravitational lensing by a spinning black hole for an observer at infinity.
Besides the primary caustic, we examine higher order caustics, formed by
photons performing one or several loops around the black hole. Our
investigation covers the whole parameter space, including the black hole spin,
its inclination with respect to the line of sight, the source distance, and the
caustic order. By comparing our results with the available analytical
approximations, we find perfect agreement in their respective domains of
validity. We then prove that all caustics maintain their shape (a tube with
astroidal cross-section) in the entire parameter space without suffering any
transitions to different caustic shapes. For nearly extremal spin, however,
higher order caustics grow so large that their cross-sections at fixed radii
wind several times around the black hole. As a consequence, for each caustic
order, the number of images ranges from 2 to 2(n+1), where n is the number of
loops spanned by the caustic. As for the critical curves, we note that for high
values of the spin they develop a small dip on the side corresponding to
prograde orbits.


title:
Very peculiar wind from BD+53 2790, the optical counterpart to 4U
  2206+54

abstract:
  BD+53 2790, an O9.5Vp star, is the optical counterpart to the HMXRB 4U
2206+54. This system was classified initially as a BeX, but observational
evidence soon stressed the need to revise this classification. The permanent
asymmetry in the H-alpha line profiles (in contrast with the cyclic variations
shown by Be stars), the variations in the profile of this line in time scales
of hours (while time scales from weeks to months are expected in Be stars), and
the lack of correlation between IR observables and H-alpha line parameters,
strongly suggest that, while BD+53 2790 contains a circunstellar disc, it is
not like the one present in Be stars. Furthermore, there is evidence of
overabundance of He in BD+53 2790. Together with the presence of an anomalous
wind, found through UV spectroscopy, the possibility to link this star with the
group of He rich stars is open. We will discuss the work done with IUE data
from BD+53 2790 and the unexpected finding of a slow and dense wind, very rare
for an O9.5V star.


title:
Experimental Observation of the Inverse Proximity Effect in
  Superconductor/Ferromagnet Layered Structures

abstract:
  We have studied the nuclear magnetic resonance (NMR) of 51V nuclei in the
superconductor/ferromagnet thin film heterostructures Ni/V/Ni and
Pd{1-x}Fe{x}/V/Pd{1-x}Fe{x} in the normaland superconducting state. Whereas the
position and shape of the NMR line in the normal state for the trilayers is
identical to that observed in a single V-layer, in the superconducting state
the line shape definitely changes, developing a systematic distortion of the
high-field wing of the resonance line. We consider this as the first
experimental evidence for the penetration of ferromagnetism into the
superconducting layer, a phenomenon which has been theoretically predicted
recently and dubbed the inverse proximity effect.


title:
A discrete finite-dimensional phase space approach for Fe8 magnetic
  clusters: characterizing tunneling efects via Wigner and Husimi functions

abstract:
  Discrete quantum phase space formalism is used to discuss some basic aspects
of the spin tunneling occurring in Fe8 magnetic cluster by means of Wigner
functions as well as Husimi distributions. Those functions were obtained for
sharp angle states and symmetric combinations of the lowest energy doublet with
the application of an external magnetic field. The time evolution of those
functions carried out numerically allows one to extract valuable information
about the dynamics of the states under consideration, in particular, the
coherent oscillations associated with the spin tunneling. It is also shown that
an entropy functional constructed out of the discrete Husimi distribution
function allows to characterize the spin tunneling.


title: Formation of vortices in a dense Bose-Einstein condensate

abstract:
  A relaxation method is employed to study a rotating dense Bose-Einstein
condensate beyond Thomas-Fermi approximation. We use a slave-boson model to
describe the strongly interacting condensate and derive a generalized
non-linear Schr\"odinger equation with kinetic term for the rotating
condensate. In comparison with previous calculations, based on Thomas-Fermi
approximation, significant improvements are found in regions, where the
condensate in a trap potential is not smooth. The critical angular velocity of
the vortex formation is higher than in the Thomas-Fermi prediction.


title:
Universal diffusive decay of correlations in gapped one-dimensional
  systems

abstract:
  We apply a semiclassical approach to express finite temperature dynamical
correlation functions of gapped spin models analytically. We show that the
approach of [A. Rapp, G. Zarand, Phys. Rev. B 74, 014433 (2006)] can also be
used for the S=1 antiferromagnetic Heisenberg chain, whose lineshape can be
measured experimentally. We generalize our calculations to O(N) quantum spin
models and the sine-Gordon model in one dimension, and show that in all these
models, the finite temperature decay of certain correlation functions is
characterized by the same universal semiclassical relaxation function.