title:
Realization of the mean-field universality class in spin-crossover
  materials

abstract:
  In spin-crossover materials, the volume of a molecule changes depending on
whether it is in the high-spin (HS) or low-spin (LS) state. This change causes
distortion of the lattice. Elastic interactions among these distortions play an
important role for the cooperative properties of spin-transition phenomena. We
find that the critical behavior caused by this elastic interaction belongs to
the mean-field universality class, in which the critical exponents for the
spontaneous magnetization and the susceptibility are $\beta = 1/2$ and $\gamma
= 1$, respectively. Furthermore, the spin-spin correlation function is a
constant at long distances, and it does not show an exponential decay in
contrast to short-range models. The value of the correlation function at long
distances shows different size-dependences: $O(1/N)$, $O(1/\sqrt{N})$, and
constant for temperatures above, at, and below the critical temperature,
respectively. The model does not exhibit clusters, even near the critical
point. We also found that cluster growth is suppressed in the present model and
that there is no critical opalescence in the coexistence region. During the
relaxation process from a metastable state at the end of a hysteresis loop,
nucleation phenomena are not observed, and spatially uniform configurations are
maintained during the change of the fraction of HS and LS. These
characteristics of the mean-field model are expected to be found not only in
spin-crossover materials, but also generally in systems where elastic
distortion mediates the interaction among local states.


title: Towards quantum cohomology of real varieties

abstract:
  This paper is devoted to a discussion of Gromov-Witten-Welschinger (GWW)
classes and their applications. In particular, Horava's definition of quantum
cohomology of real algebraic varieties is revisited by using GWW-classes and it
is introduced as a DG-operad. In light of this definition, we speculate about
mirror symmetry for real varieties.


title: Bayesian analysis of time series of single RNA under fluctuating force

abstract:
  Extracting the intrinsic kinetic information of biological molecule from its
single-molecule kinetic data is of considerable biophysical interest. In this
work, we theoretically investigate the feasibility of inferring single RNA's
intrinsic kinetic parameters from the time series obtained by forced
folding/unfolding experiment done in the light tweezer, where the molecule is
flanked by long double-stranded DNA/RNA handles and tethered between two big
beads. We first construct a coarse-grain physical model of the experimental
system. The model has captured the major physical factors: the Brownian motion
of the bead, the molecular structural transition, and the elasticity of the
handles and RNA. Then based on an analytic solution of the model, a Bayesian
method using Monte Carlo Markov Chain is proposed to infer the intrinsic
kinetic parameters of the RNA from the noisy time series of the distance or
force. Because the force fluctuation induced by the Brownian motion of the bead
and the structural transition can significantly modulate the transition rates
of the RNA, we prove that, this statistic method is more accurate and efficient
than the conventional histogram fitting method in inferring the molecule's
intrinsic parameters.


title:
On The 5D Extra-Force according to Basini-Capozziello-Ponce De Leon
  Formalism and the Experimental Research of Extra Dimensions On-Board
  International Space Station(ISS) using Laser Beams

abstract:
  We analyze the possibility of Experimental Research of Extra Dimensions
On-Board International Space Station (ISS) by using a Satellite carrying a
Laser device(optical Laser) on the other side of Earth Orbit targeted towards
ISS.The Sun will be between the Satellite and the ISS so the Laser will pass
the neighborhoods of the Sun at a distance $R$ in order to reach ISS. The Laser
beam will be Gravitationally Bent according to Classical General Relativity and
the Extra Terms predicted by Kar-Sinha in the Gravitational Bending Of Light
due to the presence of Extra Dimensions can perhaps be measured with precision
equipment.By computing the Gravitational Bending according to Einstein we know
the exact position where the Laser will reach the target on-board ISS.However
if the Laser arrives at ISS with a Bending different than the one predicted by
Einstein and if this difference is equal to the Extra Terms predicted by
Kar-Sinha then this experience would proof that we live in a Universe of more
than 4 Dimensions.We demonstrate in this work that ISS have the needed
precision to detect these Extra Terms(see eq 137 in this work).Such experience
would resemble the measures of the Gravitational Bending Of Light by Sir Arthur
Stanley Eddington in the Sun Eclipse of 1919 that helped to proof the
correctness of General Relativity although in ISS case would have more degres
of accuracy because we would be free from the interference of Earth Atmosphere.


title: Degeneracy of Angular Voronoi Diagram

abstract:
  Angular Voronoi diagram was introduced by Asano et al. as fundamental
research for a mesh generation. In an angular Voronoi diagram, the edges are
curves of degree three. From view of computational robustness we need to treat
the curves carefully, because they might have a singularity.
  We enumerate all the possible types of curves that appear as an edge of an
angular Voronoi diagram, which tells us what kind of degeneracy is possible and
tells us necessity of considering a singularity for computational robustness.


title: Characterizing Generic Global Rigidity

abstract:
  A d-dimensional framework is a graph and a map from its vertices to E^d. Such
a framework is globally rigid if it is the only framework in E^d with the same
graph and edge lengths, up to rigid motions. For which underlying graphs is a
generic framework globally rigid? We answer this question by proving a
conjecture by Connelly, that his sufficient condition is also necessary: a
generic framework is globally rigid if and only if it has a stress matrix with
kernel of dimension d+1, the minimum possible.
  An alternate version of the condition comes from considering the geometry of
the length-squared mapping l: the graph is generically locally rigid iff the
rank of l is maximal, and it is generically globally rigid iff the rank of the
Gauss map on the image of l is maximal.
  We also show that this condition is efficiently checkable with a randomized
algorithm, and prove that if a graph is not generically globally rigid then it
is flexible one dimension higher.


title: Optical pumping via incoherent Raman transitions

abstract:
  A new optical pumping scheme is presented that uses incoherent Raman
transitions to prepare a trapped Cesium atom in a specific Zeeman state within
the 6S_{1/2}, F=3 hyperfine manifold. An important advantage of this scheme
over existing optical pumping schemes is that the atom can be prepared in any
of the F=3 Zeeman states. We demonstrate the scheme in the context of cavity
quantum electrodynamics, but the technique is equally applicable to a wide
variety of atomic systems with hyperfine ground-state structure.


title:
Classification of sesquilinear forms with the first argument on a
  subspace or a factor space

abstract:
  We give canonical matrices of bilinear or sesquilinear forms
  UxV-->C, (V/U)xV-->C, in which V is a vector space over the field C of
complex numbers and U is its subspace.


title: Light meson spectrum with $N_f=2$ dynamical overlap fermions

abstract:
  We present numerical simulation of QCD with two dynamical quark flavors
described by the overlap fermion action on a $16^3\times 32\times (0.12 {\rm
fm})^4$ lattice. We calculate pseudo-scalar masses and decay constants and
investigate their chiral properties. We test the consistency of our data with
the two-loop chiral perturbation theory predictions, which should also be valid
at finite lattice spacings because of the exact chiral symmetry, including the
finite size effects.


title:
Phase transition between the quantum spin Hall and insulator phases in
  3D: emergence of a topological gapless phase

abstract:
  Phase transitions between the quantum spin Hall and the insulator phases in
three dimensions are studied. We find that in inversion-asymmetric systems
there appears a gapless phase between the quantum spin Hall and insulator
phases in three dimensions, which is in contrast with the two-dimensional case.
Existence of this gapless phase stems from a topological nature of gapless
points (diabolical points) in three dimensions, but not in two dimensions.


title:
A Kinetic Model for Photoswitching of magnetism in the High Spin
  Molecule [Mo(IV)(CN)2(CN-Cu(II)(tren))6](ClO4)8

abstract:
  The heptanuclear complex [Mo(IV)(CN)2(CN-CuL)6]8+ exhibits photomagnetism. An
earlier microscopic model showed that the transition dipole moments for
excitation in different spin manifolds are similar in magnitude. In this paper,
we attribute photomagnetism to the long lived S=3 charge transfer excited state
for which there appears to be sufficient experimental evidence. We model the
photomagnetism by employing a kinetic model which includes internal conversions
and intersystem crossings. The key feature of the model is assumption of the
existence of two kinds of S=3 states: one which has no direct pathway for
internal conversion and the other characterized by slow kinetics for internal
conversion to the low-energy states. The trapped S=3 state can decay via a
thermally activated barrier to the other S=3 state. The experimental
temperature dependence of magnetization plot is fitted using rate constants
with Arrhenius dependence. The two different experimental cMT vs. T curves
obtained with different irradiation times are fitted with our model. Our
studies show that the photomagnetism in these systems is governed by kinetics
and not due to differences in oscillator strengths for excitation of the
different spin states.


title:
Mapping giant magnetic fields around dense solid plasmas by high
  resolution magneto-optical microscopy

abstract:
  We investigate distribution of magnetic fields around dense solid plasmas
generated by intense p-polarized laser (~10^{16} W.cm^{-2}, 100 fs) irradiation
of magnetic tapes, using high sensitivity magneto optical microscopy. We
present evidence for giant axial magnetic fields and map out for the first time
the spatial distribution of these fields. By using the axial magnetic field
distribution as a diagnostic tool we uncover evidence for angular momentum
associated with the plasma. We believe this study holds significance for
investigating the process under which a magnetic material magnetizes or
demagnetizes under the influence of ultrashort intense laser pulses.


title:
Canonical matrices of isometric operators on indefinite inner product
  spaces

abstract:
  We give canonical matrices of a pair (A,B) consisting of a nondegenerate form
B and a linear operator A satisfying B(Ax,Ay)=B(x,y) on a vector space over F
in the following cases:
  (i) F is an algebraically closed field of characteristic different from 2 or
a real closed field, and B is symmetric or skew-symmetric;
  (ii) F is an algebraically closed field or the skew field of quaternions over
a real closed field, and B is Hermitian or skew-Hermitian with respect to any
nonidentity involution on F.
  We use a method that admits to reduce the problem of classifying an arbitrary
system of forms and linear mappings to the problem of classifying
representations of some quiver. This method was described in [V.V. Sergeichuk,
Math. USSR-Izv. 31 (1988) 481-501].


title:
Effect of Impurity Scattering on the Nonlinear Microwave Response in
  High-Tc Superconductors

abstract:
  We theoretically investigate intermodulation distortion in high-Tc
superconductors. We study the effect of nonmagnetic impurities on the real and
imaginary parts of nonlinear conductivity. The nonlinear conductivity is
proportional to the inverse of temperature owing to the dependence of the
damping effect on energy, which arises from the phase shift deviating from the
unitary limit. It is shown that the final-states interaction makes the real
part predominant over the imaginary part. These effects have not been included
in previous theories based on the two-fluid model, enabling a consistent
explanation for the experiments with the rf and dc fields.


title: Self-consistent quasiparticle RPA for multi-level pairing model

abstract:
  Particle-number projection within the Lipkin-Nogami (LN) method is applied to
the self-consistent quasiparticle random-phase approximation (SCQRPA), which is
tested in an exactly solvable multi-level pairing model. The SCQRPA equations
are numerically solved to find the energies of the ground and excited states at
various numbers $\Omega$ of doubly degenerate equidistant levels. The use of
the LN method allows one to avoid the collapse of the BCS (QRPA) to obtain the
energies of the ground and excited states as smooth functions of the
interaction parameter $G$. The comparison between results given by different
approximations such as the SCRPA, QRPA, LNQRPA, SCQRPA and LNSCQRPA is carried
out. While the use of the LN method significantly improves the agreement with
the exact results in the intermediate coupling region, we found that in the
strong coupling region the SCQRPA results are closest to the exact ones.


title: Single artificial-atom lasing

abstract:
  Solid-state superconducting circuits are versatile systems in which quantum
states can be engineered and controlled. Recent progress in this area has
opened up exciting possibilities for exploring fundamental physics as well as
applications in quantum information technology; in a series of experiments it
was shown that such circuits can be exploited to generate quantum optical
phenomena, by designing superconducting elements as artificial atoms that are
coupled coherently to the photon field of a resonator. Here we demonstrate a
lasing effect with a single artificial atom - a Josephson-junction charge qubit
- embedded in a superconducting resonator. We make use of one of the properties
of solid-state artificial atoms, namely that they are strongly and controllably
coupled to the resonator modes. The device is essentially different from
existing lasers and masers; one and the same artificial atom excited by current
injection produces many photons.


title: Multichannel algorithm based on generalized positional numeration system

abstract:
  This report is devoted to introduction in multichannel algorithm based on
generalized numeration notations (GPN). The internal, external and mixed
account are entered. The concept of the GPN and its classification as
decomposition of an integer on composed of integers is discussed. Realization
of multichannel algorithm on the basis of GPN is introduced. In particular,
some properties of Fibonacci multichannel algorithm are discussed.


title: Partitioning 3-homogeneous latin bitrades

abstract:
  A latin bitrade $(T^{\diamond}, T^{\otimes})$ is a pair of partial latin
squares which defines the difference between two arbitrary latin squares
$L^{\diamond} \supseteq T^{\diamond}$ and $L^{\diamond} \supseteq T^{\otimes}$
of the same order. A 3-homogeneous bitrade $(T^{\diamond}, T^{\otimes})$ has
three entries in each row, three entries in each column, and each symbol
appears three times in $T^{\diamond}$. Cavenagh (2006) showed that any
3-homogeneous bitrade may be partitioned into three transversals. In this paper
we provide an independent proof of Cavenagh's result using geometric methods.
In doing so we provide a framework for studying bitrades as tessellations of
spherical, euclidean or hyperbolic space.


title: Stabilizability and percolation in the infinite volume sandpile model

abstract:
  We study the sandpile model in infinite volume on $\mathbb{Z}^d$. In
particular, we are interested in the question whether or not initial
configurations, chosen according to a stationary measure $\mu$, are
$\mu$-almost surely stabilizable. We prove that stabilizability does not depend
on the particular procedure of stabilization we adopt. In $d=1$ and $\mu$ a
product measure with density $\rho=1$ (the known critical value for
stabilizability in $d=1$) with a positive density of empty sites, we prove that
$\mu$ is not stabilizable. Furthermore, we study, for values of $\rho$ such
that $\mu$ is stabilizable, percolation of toppled sites. We find that for
$\rho>0$ small enough, there is a subcritical regime where the distribution of
a cluster of toppled sites has an exponential tail, as is the case in the
subcritical regime for ordinary percolation.


title:
The Theoretical status of $\bar{B}-B$-mixing and lifetimes of heavy
  hadrons

abstract:
  In this talk we review the theoretical status of the lifetime ratios of heavy
hadrons and of the B-mixing quantities $\Delta M_s$, $\Delta \Gamma_s$ and
$\phi_s$. While $\Delta M_s$ and $\Delta \Gamma_s$ suffer from large
uncertainties due to the badly known decay constants, the ratio $\Delta
\Gamma_s / \Delta M_s$ can be determined with almost no non-perturbative
uncertainties, therefore it can be used to look for possible new physics
effects.


title: Projective Ring Line of an Arbitrary Single Qudit

abstract:
  As a continuation of our previous work (arXiv:0708.4333) an algebraic
geometrical study of a single $d$-dimensional qudit is made, with $d$ being
{\it any} positive integer. The study is based on an intricate relation between
the symplectic module of the generalized Pauli group of the qudit and the fine
structure of the projective line over the (modular) ring $\bZ_{d}$. Explicit
formulae are given for both the number of generalized Pauli operators commuting
with a given one and the number of points of the projective line containing the
corresponding vector of $\bZ^{2}_{d}$. We find, remarkably, that a perp-set is
not a set-theoretic union of the corresponding points of the associated
projective line unless $d$ is a product of distinct primes. The operators are
also seen to be structured into disjoint `layers' according to the degree of
their representing vectors. A brief comparison with some multiple-qudit cases
is made.


title:
Sharp asymptotics for the partition function of some continuous-time
  directed polymers

abstract:
  This paper is concerned with two related types of directed polymers in a
random medium. The first one is a d-dimensional Brownian motion living in a
random environment which is Brownian in time and homogeneous in space. The
second is a continuous-time random walk on the lattice Z^d, in a random
environment with similar properties as in continuous space. The case of a
space-time white noise environment can be acheived in this second setting. By
means of some Gaussian tools, we estimate the free energy of these models at
low temperature, and give some further information on the strong disorder
regime of the objects under consideration.


title: On some properties of Riemann zeta function on critical line

abstract:
  The aim of this paper is to show further results following those published in
[5], and to relate the Riemann zeta function to the relativistic cosmology.


title: Local SUSY-breaking minima in N_f=N_c SQCD?

abstract:
  We study non-supersymmetric minima in N_f=N_c SQCD conjectured by
Intriligator, Seiberg and Shih (ISS). We show that the existence of such minima
depends on the signs of three non-calculable parameters and that no evidence
can be inferred by deforming the theory. We illustrate this by demonstrating
that the conjectured minimum is destabilized in a different deformation of
N_f=N_c SQCD. We also comment briefly on the phenomenological consequences of
this instability.


title:
Thermodynamics and heavy-quark free energies at finite temperature and
  density with two flavors of improved Wilson quarks

abstract:
  Thermodynamics of two-flavor QCD at finite temperature and density is studied
on a $16^3 \times 4$ lattice, using a renormalization group improved gauge
action and the clover improved Wilson quark action. In the simulations along
lines of constant $m_{\rm PS}/m_{\rm V}$, we calculate the Taylor expansion
coefficients of the heavy-quark free energy with respect to the quark chemical
potential ($\mu_q$) up to the second order. By comparing the expansion
coefficients of the free energies between quark($Q$)and antiquark($\bar{Q}$),
and between $Q$ and $Q$, we find a characteristic difference at finite $\mu_q$
due to the first order coefficient of the Taylor expansion. We also calculate
the quark number and isospin susceptibilities, and find that the second order
coefficient of the quark number susceptibility shows enhancement around the
pseudo-critical temperature.


title:
Simplest miniversal deformations of matrices, matrix pencils, and
  contragredient matrix pencils

abstract:
  V. I. Arnold [Russian Math. Surveys 26 (2) (1971) 29-43] constructed a simple
normal form for a family of complex n-by-n matrices that smoothly depend on
parameters with respect to similarity transformations that smoothly depend on
the same parameters. We construct analogous normal forms for a family of real
matrices and a family of matrix pencils that smoothly depend on parameters,
simplifying their normal forms by D. M. Galin [Uspehi Mat. Nauk 27 (1) (1972)
241-242] and by A. Edelman, E. Elmroth, B. Kagstrom [Siam J. Matrix Anal. Appl.
18 (3) (1997) 653-692].


title:
Time dilation of a bound half-fluxon pair in a long Josephson junction
  with a ferromagnetic insulator

abstract:
  The fluxon dynamics in a long Josephson junction with a ferromagnetic
insulating layer is investigated. It is found that the Josephson phase obeys a
double sine-Gordon equation involving a bound pi fluxon solution, and the
internal oscillations of the bound pair acting as a clock exhibit Lorentz
reductions in their frequencies regarded as a relativistic effect in the time
domain, i.e., time dilation. This is the complement to the Lorentz contraction
of fluxons with no clock. A possible observation scheme is also discussed.


title: ppK- bound states from Skyrmions

abstract:
  The bound kaon approach to the strangeness in the Skyrme model is applied to
investigating the possibility of deeply bound $ppK^-$ states. We describe the
$ppK^-$ system as two-Skyrmion around which a kaon field fluctuates. Each
Skyrmion is rotated in the space of SU(2) collective coordinate. The rotational
motions are quantized to be projected onto the spin-singlet proton-proton
state. We derive the equation of motion for the kaon in the background field of
two Skyrmions at fixed positions. From the numerical solution of the equation
of motion, it is found that the energy of $K^-$ can be considerably small, and
that the distribution of $K^-$ shows molecular nature of the $ppK^-$ system.
For this deep binding, the Wess-Zumino-Witten term plays an important role. The
total energy of the $ppK^-$ system is estimated in the Born-Oppenheimer
approximation. The binding energy of the $ppK^-$ state is $B.E.\simeq 126$ MeV.
The mean square radius of the $pp$ subsystem is $\sqrt{< r_{pp}^2>}\simeq 1.6$
fm.


title: Generic families of matrix pencils and their bifurcation diagrams

abstract:
  V. I. Arnold [Russian Math. Surveys 26, no. 2, 1971, 29-43] constructed
smooth generic families of matrices with respect to similarity transformations
depending smoothly on the entries of matrices and got bifurcation diagrams of
such families with a small number of parameters. We extend these results to
pencils of matrices.


title:
From spin and orbital SU(4) to spin SU(2) Kondo effect in double quantum
  dot

abstract:
  We consider spin and orbital Kondo effect in a parallel arrangement of two
strongly electrostatically coupled quantum dots. Increasing the exchange of
electrons between the dots through the attached leads induces a smooth
crossover between SU(4) spin- and orbital Kondo effect and SU(2) spin Kondo
effect. Being the same for the SU(4) and SU(2) symmetry points, the Kondo
temperature drops slightly in the intermediate regime. Experimentally, two
kinds of Kondo effect can be discriminated by the sensitivity to the
suppression of the spin Kondo effect by Zeeman field. The dependence of the
Kondo temperature and of the differential conductance on the strength of
electronic exchange through the leads and Zeeman field is analyzed in detail.


title: If all geodesics are closed on the projective plane

abstract:
  The paper shows that the curvature of RP2 is constant iff all geodesics are
closed. Therefore RP2 is the first known manifold with only one G-structure. It
took quiete a long time to find such a manifold. The author shows only that if
all geodesics are closed then there are infinitely many simple closed
geodesics. This proof is based on the geodesic return map and the theory of
topological dynamics. From important results of Green, Grove and Gromoll one
can conclude the theorem.


title:
Generalized Curvature and Ricci Tensors for a Higher Spin Potential and
  the Trace Anomaly in External Higher Spin Fields in AdS_{4} Space

abstract:
  The curvature of a higher spin potential as constructed in a previous article
of the same authors arXiv:0705.3528 is applied to the analysis of the
linearized trace anomaly obtained from the quadratic part of the effective
action for a conformally coupled scalar with linearized interaction with the
external higher spin fields arXiv:hep-th/0602067. The spin is restricted to
four to profit from technical simplifications but without reducing the problem
in principle. The issue includes the calculation of all Ricci tensors as
multiple traces of the curvature, the derivation of all primary and secondary
Bianchi identities, expressing all Ricci tensors as differential operators
applied to the Fronsdal term, calculating the Weyl variation of these, and
showing finally that Weyl variations of integrals over contracted squares of
Ricci tensors can be used to eliminate the anomaly completely. This peculiarity
is discussed in detail. As tools we use the formalism of bisymmetric tensor
fields whose space is equipped with a local bilinear invariant form, the
*-form.


title:
The AGB stars of the intermediate-age LMC cluster NGC 1846 Variability
  and age determination

abstract:
  Aims: To investigate variability and to model the pulsational behaviour of
AGB variables in the intermediate-age LMC cluster NGC 1846.
  Methods: Our own photometric monitoring has been combined with data from the
MACHO archive to detect 22 variables among the cluster's AGB stars and to
derive pulsation periods. According to the global parameters of the cluster we
construct pulsation models taking into account the effect of the C/O ratio on
the atmospheric structure. In particular, we have used opacities appropriate
for both O-rich stars and carbon stars in the pulsation calculations.
  Results: The observed P-L-diagram of NGC 1846 can be fitted using a mass of
the AGB stars of about 1.8 M$_{\sun}$. We show that the period of pulsation is
increased when an AGB star turns into a carbon star. Using the mass on the AGB
defined by the pulsational behaviour of our sample we derive a cluster age of
$1.4\times10^{9}$ years. This is the first time the age of a cluster has been
derived from the variability of its AGB stars. The carbon stars are shown to be
a mixture of fundamental and first overtone radial pulsators.


title:
Classification of squared normal operators on unitary and Euclidean
  spaces

abstract:
  We give a canonical form for a complex matrix, whose square is normal, under
transformations of unitary similarity as well as a canonical form for a real
matrix, whose square is normal, under transformations of orthogonal similarity.


title:
The XMM-Newton bright serendipitous survey. Identification and optical
  spectral properties

abstract:
  AIMS: We present the optical classification and redshift of 348 X-ray
selected sources from the XMM-Newton Bright Serendipitous Survey (XBS) which
contains a total of 400 objects (identification level = 87%). About 240 are new
identifications. In particular, we discuss in detail the classification
criteria adopted for the Active Galactic Nuclei population.
  METHODS: By means of systematic spectroscopic campaigns and through the
literature search we have collected an optical spectrum for the large majority
of the sources in the XBS survey and applied a well-defined classification
``flow-chart''.
  RESULTS: We find that the AGN represent the most numerous population at the
flux limit of the XBS survey (~10^-13 erg cm^-2 s^-1) constituting 80% of the
XBS sources selected in the 0.5-4.5 keV energy band and 95% of the ``hard''
(4.5-7.5 keV) selected objects. Galactic sources populate significantly the
0.5-4.5 keV sample (17%) and only marginally (3%) the 4.5-7.5 keV sample. The
remaining sources in both samples are clusters/groups of galaxies and normal
galaxies (i.e. probably not powered by an AGN). Furthermore, the percentage of
type2 AGN (i.e. optically absorbed AGNs with A_V>2mag) dramatically increases
going from the 0.5-4.5 keV sample (f=N_AGN2/N_AGN=7%) to the 4.5-7.5 keV sample
(f=32%). We finally propose two simple diagnostic plots that can be easily used
to obtain the spectral classification for relatively low redshift AGNs even if
the quality of the spectrum is not good.


title: Second Law of Thermodynamics with Discrete Quantum Feedback Control

abstract:
  A new thermodynamic inequality is derived which leads to the maximum work
that can be extracted from multi-heat baths with the assistance of discrete
quantum feedback control. The maximum work is determined by the free-energy
difference and a generalized mutual information content between the
thermodynamic system and the feedback controller. This maximum work can exceed
that in conventional thermodynamics and, in the case of a heat cycle with two
heat baths, the heat efficiency can be greater than that of the Carnot cycle.
The consistency of our results with the second law of thermodynamics is ensured
by the fact that work is needed for information processing of the feedback
controller.


title:
A Defective Graphene Phase Predicted to be a Room Temperature
  Ferromagnetic Semiconductor

abstract:
  Theoretical calculations, based on hybrid exchange density functional theory,
are used to show that in graphene a periodic array of defects generates a
ferromagnetic ground state at room temperature for unexpectedly large defect
separations. This is demonstrated for defects that consist of a carbon vacancy
in which two of the dangling bonds are saturated with H atoms. The magnetic
coupling mechanism is analysed and found to be due to an instability in the
$\pi$ electron system with respect to a long-range spin polarisation
characterised by alternation in the spin direction between adjacent carbon
atoms. The disruption of the $\pi$-bonding opens a semiconducting gap at the
Fermi edge. The size of the energy gap and the magnetic coupling strength are
strong functions of the defect separation and can thus be controlled by varying
the defect concentration. The position of the semiconducting energy gap and the
electron effective mass are strongly spin-dependent and this is expected to
result in a spin asymmetry in the transport properties of the system. A
defective graphene sheet is therefore a very promising material with an
in-built mechanism for tailoring the properties of the spintronic devices of
the future.


title:
Response Theory for Equilibrium and Non-Equilibrium Statistical
  Mechanics: Causality and Generalized Kramers-Kronig relations

abstract:
  We consider the general response theory proposed by Ruelle for describing the
impact of small perturbations to the non-equilibrium steady states resulting
from Axiom A dynamical systems. We show that the causality of the response
functions allows for writing a set of Kramers-Kronig relations for the
corresponding susceptibilities at all orders of nonlinearity. Nonetheless, only
a special class of observable susceptibilities obey Kramers-Kronig relations.
Specific results are provided for arbitrary order harmonic response, which
allows for a very comprehensive Kramers-Kronig analysis and the establishment
of sum rules connecting the asymptotic behavior of the susceptibility to the
short-time response of the system. These results generalize previous findings
on optical Hamiltonian systems and simple mechanical models, and shed light on
the general impact of considering the principle of causality for testing
self-consistency: the described dispersion relations constitute unavoidable
benchmarks for any experimental and model generated dataset. In order to
connect the response theory for equilibrium and non equilibrium systems, we
rewrite the classical results by Kubo so that response functions formally
identical to those proposed by Ruelle, apart from the measure involved in the
phase space integration, are obtained. We briefly discuss how these results,
taking into account the chaotic hypothesis, might be relevant for climate
research. In particular, whereas the fluctuation-dissipation theorem does not
work for non-equilibrium systems, because of the non-equivalence between
internal and external fluctuations, Kramers-Kronig relations might be more
robust tools for the definition of a self-consistent theory of climate change.

categories: cond-mat.stat-mech cond-mat.str-el math-ph math.MP nlin.CD physics.flu-dyn


title: Fermion pair production in planar Coulomb and Aharonov--Bohm potentials

abstract:
  Exact analytic solutions are found for the Dirac equation in 2+1 dimensions
for a spin-one-half particle in a combination of the Lorentz 3-vector and
scalar Coulomb as well as Aharonov--Bohm potentials. We employ the
two-component Dirac equation which contains a new parameter introduced by Hagen
to describe the spin of the spin-1/2 particle. We derive a transcendental
equations that implicitly determine the energy spectrum of an electron near the
negative-energy continuum boundary and the critical charges for some electron
states. Fermion pair production from a vacuum by a strong Coulomb field in the
presence of the magnetic flux tube of zero radius is considered. It is shown
that the presence of the Ahanorov--Bohm flux tends to stabilize the system.

categories: hep-th cond-mat.other cond-mat.str-el math-ph math.MP quant-ph


title: Fair Triangulations

abstract:
  We describe the statistics of checkerboard triangulations obtained by
colouring black every other triangle in triangulations of convex polygons.


title: Broad band X-ray spectroscopy of A0535+262 with SUZAKU

abstract:
  The transient X-ray binary pulsar A0535+262 was observed with Suzaku on 2005
September 14 when the source was in the declining phase of the August-September
minor outburst. The ~103 s X-ray pulse profile was strongly energy dependent, a
double peaked profile at soft X-ray energy band (<3 keV) and a single peaked
smooth profile at hard X-rays. The width of the primary dip is found to be
increasing with energy. The broad-band energy spectrum of the pulsar is well
described with a Negative and Positive power-law with EXponential (NPEX)
continuum model along with a blackbody component for soft excess. A weak iron
K_alpha emission line with an equivalent width ~25 eV was detected in the
source spectrum. The blackbody component is found to be pulsating over the
pulse phase implying the accretion column and/or the inner edge of the
accretion disk may be the possible emission site of the soft excess in
A0535+262. The higher value of the column density is believed to be the cause
of the secondary dip at the soft X-ray energy band. The iron line equivalent
width is found to be constant (within errors) over the pulse phase. However, a
sinusoidal type of flux variation of iron emission line, in phase with the hard
X-ray flux suggests that the inner accretion disk is the possible emission
region of the iron fluorescence line.


title: Yang-Mills thermodynamics

abstract:
  We present a quantitative analysis of Yang-Mills thermodynamics in 4D flat
spacetime. The focus is on the gauge group SU(2). Results for SU(3) are
mentioned in passing. Although all essential arguments and results were
reported elsewhere we summarize them here in a concise way and offer a number
of refinements and some additions.


title: Screening masses of mesons in 2+1 flavour QCD

abstract:
  We present results for screening masses of light and strange mesons in 2+1
flavour QCD using improved (p4fat3) staggered fermions on 6x24^3 lattices. We
have studied the screening masses of scalar, pseudo-scalar, vector and
axial-vector mesons along the line of constant physics, determined by a pion
mass ~220 MeV and a kaon mass ~500 MeV. In order to investigate the cut-off and
volume dependencies we have also performed studies of the meson screening
correlators in the non-interacting theory using the p4 and the standard
staggered discretizations.


title:
Ram pressure stripping the hot gaseous halos of galaxies in groups and
  clusters

abstract:
  We use a large suite of carefully controlled full hydrodynamic simulations to
study the ram pressure stripping of the hot gaseous halos of galaxies as they
fall into massive groups and clusters. The sensitivity of the results to the
orbit, total galaxy mass, and galaxy structural properties is explored. For
typical structural and orbital parameters, we find that ~30% of the initial hot
galactic halo gas can remain in place after 10 Gyr. We propose a physically
simple analytic model that describes the stripping seen in the simulations
remarkably well. The model is analogous to the original formulation of Gunn &
Gott (1972), except that it is appropriate for the case of a spherical (hot)
gas distribution (as opposed to a face-on cold disk) and takes into account
that stripping is not instantaneous but occurs on a characteristic timescale.
The model reproduces the results of the simulations to within approximately 10%
at almost all times for all the orbits, mass ratios, and galaxy structural
properties we have explored. The one exception involves unlikely systems where
the orbit of the galaxy is highly non-radial and its mass exceeds about 10% of
the group or cluster into which it is falling (in which case the model
under-predicts the stripping following pericentric passage). The proposed model
has several interesting applications, including modelling the ram pressure
stripping of both observed and cosmologically-simulated galaxies and as a way
to improve current semi-analytic models of galaxy formation. One immediate
consequence is that the colours and morphologies of satellite galaxies in
groups and clusters will differ significantly from those predicted with the
standard assumption of complete stripping of the hot coronae.


title: Holographic Aspects of Electric-Magnetic Dualities

abstract:
  We review recent work on holographic aspects of electric-magnetic dualities
in theories that involve conformally coupled scalars and abelian gauge fields
in asymptotically AdS4 spaces. Such models are relevant for the holographic
description of M-theory. We also briefly comment on some new results on the
holographic properties of generalized electric-magnetic duality in gravity.


title: Generalized virial theorem in f(R) gravity

abstract:
  We generalize the virial theorem in f(R) modified gravity using the
collisionless Boltzmann equation. We find supplementary geometric terms in the
modified Einstein equation providing an effective contribution to the
gravitational energy. The total virial mass is proportional to the effective
mass associated with the new geometrical term, which may account for the
well-known virial theorem mass discrepancy in clusters of galaxies. The model
predicts that the geometric mass and its effects extend beyond the virial
radius of the clusters. We also consider the behavior of the galaxy cluster
velocity dispersion in f(R) models. Thus, the f(R) virial theorem can be an
efficient tool in observationally testing the viability of this class of
generalized gravity models.


title:
Correction of Errors in the First-Order Perturbation Expansions of
  Singular Vectors

abstract:
  This note corrects some serious errors in the first-order perturbation
analysis of singular vectors as published by G.W. Stewart in his book "Matrix
Algorithms Volume II: Eigensystems", SIAM, 2001.


title: The modulation of the gamma-ray emission from the binary LS 5039

abstract:
  Gamma-ray binaries, composed of a massive star and compact object, have been
established as a new class of sources of very high energy (VHE) photons. The
gamma-rays are produced by inverse Compton scattering of the stellar light by
VHE electrons accelerated in the vicinity of the compact object. The VHE
emission from LS 5039 displays an orbital modulation.
  The inverse Compton spectrum depends on the angle between the incoming and
outgoing photon in the electron rest frame. Since the angle at which an
observer sees the star and electrons changes with the orbit, a phase dependence
of the spectrum is expected. The phase-dependent spectrum of LS 5039 is
calculated, assuming a continuous injection of electrons. The shape of the
electron distribution depends on the injected power-law and on the magnetic
field intensity.
  Anisotropic scattering produces hard emission at inferior conjunction, when
attenuation due to pair production of the VHE gamma-rays on star light is
minimum. The computed lightcurve and spectra provide good fits to the HESS and
EGRET observations, except at phases of maximum attenuation where pair cascade
emission may be significant for HESS. Detailed predictions are made for a
modulation in the GLAST energy range. The magnetic field intensity at
periastron is 0.8+-0.2 G.
  Anisotropic inverse Compton scattering plays a major role in LS 5039. The
derived magnetic field intensity, injection energy and slope suggest a
rotation-powered pulsar wind nebula. Gamma-ray binaries are promising sources
to study the environment of pulsars on small scales.


title: Quasi-Fuchsian AdS representations are Anosov

abstract:
  In a recent paper, Q. M\'erigot proved that representations in SO(2,n) of
uniform lattices of SO(1,n) which are Anosov in the sense of Labourie are
quasi-Fuchsian, i.e. are faithfull, discrete, and preserve an acausal subset in
the boundary of anti-de Sitter space. In the present paper, we prove the
reverse implication. It also includes: -- A construction of Dirichlet domains
in the context of anti-de Sitter geometry, -- A proof that spatially compact
globally hyperbolic anti-de Sitter spacetimes with acausal limit set admit
locally CAT(-1) Cauchy hypersurfaces.


title: Stability of Reissner Nordstr$\ddot{o}$m Black Hole

abstract:
  The singularity of the solutions obtained before in the teleparallel theory
of gravitation is studied. Also the stability of these solutions is studied
using the equations of geodesic deviation. The condition of stability is
obtained. From this condition the stability of Schwarzschild solution can be
obtained.


title: The Extending for Composite Skyrme Model

abstract:
  In this paper, we have extended the composite Skyrme model proposed by H. Y.
Cheung, F. Gursey to some respects of theoretical physics such as
supersymmetry, gravitation.


title: A Floer homology for exact contact embeddings

abstract:
  In this paper we construct the Floer homology for an action functional which
was introduced by Rabinowitz and prove a vanishing theorem. As an application,
we show that there are no displaceable exact contact embeddings of the unit
cotangent bundle of a sphere of dimension greater than three into a convex
exact symplectic manifold with vanishing first Chern class. This generalizes
Gromov's result that there are no exact Lagrangian embeddings of a sphere into
a complex vector space.


title: Modulation invariant bilinear T(1) theorem

abstract:
  We prove a T(1) theorem for bilinear singular integral operators (trilinear
forms) with a one-dimensional modulation symmetry.


title:
Hawking radiation in GHS and non-extremal D1-D5 blackhole via covariant
  anomalies

abstract:
  We apply the method of Banerjee and Kulkarni (arXiv:0707.2449, [hep-th]) to
provide a derivation of Hawking radiation from the GHS (stringy) blackhole
which falls in the class of the most general spherically symmetric blackholes
($\sqrt{-g}\neq 1$) and also the non-extremal $D1-D5$ blackhole using only
covariant gravitational anomalies.


title:
Renormalisation of quark bilinears with Nf=2 Wilson fermions and
  tree-level improved gauge action

abstract:
  We present results for the renormalisation constants of bilinear quark
operators, using the Nf=2 twisted mass Wilson action at maximal twist (which
guarantees automatic O(a) improvement) and the tree-level Symanzik improved
gauge action. The scale-independent renormalisation constants are computed with
a new method, which makes use of both standard twisted mass and
Osterwalder-Seiler fermions. Moreover, the results from an RI-MOM calculation
are presented for both scale independent and scale dependent renormalisation
constants.


title: A Three Dimensional Kasteleyn Transition: Spin Ice in a [100] Field

abstract:
  We examine the statistical mechanics of spin-ice materials with a [100]
magnetic field. We show that the approach to saturated magnetisation is, in the
low-temperature limit, an example of a 3D Kasteleyn transition, which is
topological in the sense that magnetisation is changed only by excitations that
span the entire system. We study the transition analytically and using a Monte
Carlo cluster algorithm, and compare our results with recent data from
experiments on Dy2Ti2O7.


title: Bilinear multipliers on Lorenzt spaces

abstract:
  We give one sufficient and two necessary conditions for boundedness between
Lebesgue or Lorentz spaces of several classes of bilinear multiplier operators
closely connected with the bilinear Hilbert transform.


title: QCD symmetries in excited hadrons

abstract:
  Recent developments for chiral and $U(1)_A$ restorations in excited hadrons
are reviewed. We emphasize predictions of the chiral symmetry restoration
scenario for axial charges and couplings to Goldstone bosons. Using very
general chiral symmetry arguments it is shown that strict chiral restoration in
a given excited nucleon forbids its decay into the $N \pi$ channel. We confront
this prediction with the $N^*N\pi$ coupling constants extracted from the decay
widths and observe a 100 % correlation of these data with the spectroscopic
parity doublet patterns. These results suggest that the lowest approximate
chiral parity doublet is the $N(1440) - N(1535)$ pair. In the meson sector we
discuss predictions of the chiral symmetry restoration for still missing states
and a signature of the higher symmetry observed in new $\bar p p$ data. We
conclude with the exactly solvable chirally symmetric and confining model that
can be considered as a generalization of the 1+1 dimensional 't Hooft model to
4 dimensions. Complete spectra of $\bar q q$ mesons demonstrate a fast chiral
restoration with increasing $J$ and a slow one with increasing $n$.


title:
Three-Dimensional Observations of H_2 Emission around Sgr A East - I.
  Structure in the Central 10 Parsecs of Our Galaxy

abstract:
  We have obtained velocity-resolved spectra of the H_2 v=1-0 S(1) (lambda =
2.1218 micron) emission line at 2 arcsec angular resolution (or 0.08 pc spatial
resolution) in four regions within the central 10 pc of the Galaxy where the
supernova-like remnant Sgr A East is colliding with molecular clouds. To
investigate the kinematic, physical, and positional relationships between the
important gaseous components in the center, we compared the H_2 data cube with
previously published NH_3 data. The projected interaction-boundary of Sgr A
East is determined to be an ellipse with its center offset 1.5 pc from Sgr A*
and dimensions of 10.8 pc X 7.6 pc. This H_2 boundary is larger than the
synchrotron emission shell but consistent with the dust ring which is believed
to trace the shock front of Sgr A East. Since Sgr A East is driving shocks into
its nearby molecular clouds, we can determine their positional relationships
using the shock directions as indicators. As a result, we suggest a revised
model for the three-dimensional structure of the central 10 pc. The actual
contact between Sgr A East and all of the surrounding molecular material,
including the circum-nuclear disk and the southern streamer, makes the
hypothesis of infall into the nucleus and feeding of Sgr A* very likely.


title: Preparation of entangled states of two photons in several spatial modes

abstract:
  We describe a protocol capable of preparing an arbitrary state of two photons
in several spatial modes using pairs of photons generated by spontaneous
parametric down-conversion, linear optical elements and single-photon detectors
or post-selection. The protocol involves unitary and non-unitary
transformations realizable by beam splitters and phase shifters. Non-unitary
transformations are implemented by attenuation filters. The protocol contains
several optimization capabilities with the goal of improving overall
probability of its success. We also show how entangled two-photon states
required for quantum computing with linear optics can be prepared using a very
simple and feasible scheme.


title: Illuminating the 1/x moment of parton distribution functions

abstract:
  The Weisberger relation, an exact statement of the parton model, elegantly
relates a high-energy physics observable, the 1/x moment of parton distribution
functions, to a nonperturbative low-energy observable: the dependence of the
nucleon mass on the value of the quark mass or its corresponding quark
condensate. We show that contemporary fits to nucleon structure functions fail
to determine this 1/x moment; however, deeply virtual Compton scattering can be
described in terms of a novel F_{1/x}(t) form factor which illuminates this
physics. An analysis of exclusive photon-induced processes in terms of the
parton-nucleon scattering amplitude with Regge behavior reveals a failure of
the high Q^2 factorization of exclusive processes at low t in terms of the
Generalized Parton-Distribution Functions which has been widely believed to
hold in the past. We emphasize the need for more data for the DVCS process at
large t in future or upgraded facilities.


title: Mathematical genesis ? Big Bang and Cantor set

abstract:
  A mathematical framework is proposed for the "big bang". It starts with some
Cantor set and assumes the existence of a transformation from that set to the
continuum set used in conventional physical theories like general relativity
and quantum mechanics.


title: Naked Singularities, Cosmic Time Machines and Impulsive Events

abstract:
  Continued gravitational collapse gives rise to curvature singularities. If a
curvature singularity is globally naked then the space-time may be causally
future ill-behaved admitting closed time-like or null curves which extend to
asymptotic distances and generate a Cosmic Time Machine (de Felice (1995)
Lecture Notes in Physics 455, 99). The conjecture that Cosmic Time Machines
give rise to high energy impulsive events is here considered in more details.


title: Astrophysics with the AMS-02 experiment

abstract:
  The Alpha Magnetic Spectrometer (AMS), whose final version AMS-02 is to be
installed on the International Space Station (ISS) for at least 3 years, is a
detector designed to measure charged cosmic ray spectra with energies up to the
TeV region and with high energy photon detection capability up to a few hundred
GeV, using state-of-the-art particle identification techniques. Following the
successful flight of the detector prototype (AMS-01) aboard the space shuttle,
AMS-02 is expected to provide a significant improvement on the current
knowledge of the elemental and isotopic composition of hadronic cosmic rays due
to its long exposure time (minimum of 3 years) and large acceptance (0.5 m^2
sr) which will enable it to collect a total statistics of more than 10^10
nuclei. Detector capabilities for charge, velocity and mass identification,
estimated from ion beam tests and detailed Monte Carlo simulations, are
presented. Relevant issues in cosmic ray astrophysics addressed by AMS-02,
including the test of cosmic ray propagation models, galactic confinement times
and the influence of solar cycles on the local cosmic ray flux, are briefly
discussed.


title: Hard hadron spectroscopy

abstract:
  I review lattice QCD calculations that compute the masses of the flavour
singlet pseudoscalar mesons. I describe the progress in computing the mass
spectrum of light 0++ mesons using lattice QCD. I also compare the results for
basic quantities such as fpi and mrho, from various different formalisms of
lattice QCD. I discuss the physical value of r0.


title:
Activation of additional energy dissipation processes in the
  magnetization dynamics of epitaxial chromium dioxide films

abstract:
  The precessional magnetization dynamics of a chromium dioxide$(100)$ film is
examined in an all-optical pump-probe setup. The frequency dependence on the
external field is used to extract the uniaxial in-plane anisotropy constant.
The damping shows a strong dependence on the frequency, but also on the laser
pump fluency, which is revealed as an important experiment parameter in this
work: above a certain threshold further channels of energy dissipation open and
the damping increases discontinuously. This behavior might stem from spin-wave
instabilities.


title: Poincar\'e series associated with surface singularities

abstract:
  We unify and generalize formulas obtained by Campillo, Delgado and
Gusein-Zade in their series of articles. Positive results are established for
rational and minimally elliptic singularities. By examples and counterexamples
we also try to find the `limits' of these identities. Connections with the
Seiberg-Witten Invariant Conjecture and Semigroup Density Conjecture are
discussed.


title:
Confront Holographic QCD with Regge Trajectories of vectors and
  axial-vectors

abstract:
  We derive the general 5-dimension metric structure of the $Dp-Dq$ system in
type II superstring theory, and demonstrate the physical meaning of the
parameters characterizing the 5-dimension metric structure of the
\textit{holographic} QCD model by relating them to the parameters describing
Regge trajectories. By matching the spectra of vector mesons $\rho_1$ with
deformed $Dp-Dq$ soft-wall model, we find that the spectra of vector mesons
$\rho_1$ can be described very well in the soft-wall $D3-Dq$ model, i.e,
$AdS_5$ soft-wall model. We then investigate how well the $AdS_5$ soft-wall
model can describe the Regge trajectory of axial-vector mesons $a_1$. We find
that the constant component of the 5-dimension mass square of axial-vector
mesons plays an efficient role to realize the chiral symmetry breaking in the
vacuum, and a small negative $z^4$ correction in the 5-dimension mass square is
helpful to realize the chiral symmetry restoration in high excitation states.


title:
A characterization of nef and good divisors by asymptotic multiplier
  ideals

abstract:
  A characterization of nef and good divisors is given: a divisor D on a smooth
complex projective variety is nef and good if and only if the asymptotic
multiplier ideals of sufficiently high multiples of e(D) D$ are trivial, where
e(D) denotes the exponent of the divisor D. Some results of the same kind are
proved in the analytic setting.


title:
Perturbative determination of $c_{SW}$ with Symanzik improved gauge
  action and stout smearing

abstract:
  We determine the improvement factor $c_{SW}$ in one-loop lattice perturbation
theory for the plaquette and Symanzik improved gauge actions. The fermionic
action is ${\mathcal{O}(a)}$ clover improved with one-time stout smearing.
$c_{SW}$ is derived from the one-loop correction to the quark-quark-gluon
vertex in the off-shell regime. We give a first numerical value for the
one-loop contribution to the non gauge-invariant improvement coefficient
$c_{NGI}$ for the quark field using the plaquette action. A discussion of mean
field improvement is included.


title: Analytic properties of the free energy: the tricritical Ising model

abstract:
  We investigate the tricritical Ising model in complex magnetic field in order
to characterize the analytic structure of its free energy. By supplementing
analytic methods with the truncation of conformal space technique we obtain
nonperturbative data even if the field theories we consider are not integrable.
The existence of edge singularities analogous to the Lee-Yang points in the
Ising field theory is confirmed. A surprising result, due to the conformal
dimensions of the operators involved, is the appearance of two branching points
which seems appealing to identify with a pair of complex conjugate spinodal
singularities.


title:
Expectation values, experimental predictions, events and entropy in
  quantum gravitationally decohered quantum mechanics

abstract:
  We restate Kay's 1998 hypothesis which simultaneously offers an objective
definition for the entropy of a closed system, a microscopic foundation for the
Second Law, a resolution of the Information Loss (and other) Black-Hole
Puzzle(s) and an objective mechanism for decoherence. Presupposing a
conventional unitary theory of low-energy quantum gravity, it offers all this
by taking the physical density operator of a closed system to be the partial
trace of its total density operator (assumed pure) over gravity and by defining
its physical entropy to be its `matter-gravity entanglement entropy'. We also
recall Kay's 1998 modified non-relativistic (many-body) quantum mechanics based
on Kay's hypothesis with a Newtonian approximation to quantum gravity. In this
modification, we find formal expectation values for certain `observables' such
as momentum-squared and Parity are altered but those for functions of positions
are unaltered. However, by arguing that every real measurement can ultimately
be taken to be a position measurement, we prove that, in practice, it is
impossible to detect any alteration at all and, in particular, we predict no
alteration for Roger Penrose's experiment. Nevertheless, Kay's modification
contains no Schr\"odinger Cat-like states, and also allows an `events'
interpretation which we tentatively propose and begin to explore. We also
obtain a Second-Law type result for a non-relativistic toy-model closed system
and argue that similar results will apply for a wide class of model Newtonian
and post-Newtonian closed systems although we argue that ordinary actual
lab-sized systems can never be treated as closed for the purpose of calculating
their entropy. Compared with `collapse models' such as GRW, Kay's Newtonian
theory does a similar job while being free from ad hoc assumptions.


title:
Particle identification with the AMS-02 RICH detector: search for dark
  matter with antideuterons

abstract:
  The Alpha Magnetic Spectrometer (AMS), whose final version AMS-02 is to be
installed on the International Space Station (ISS) for at least 3 years, is a
detector designed to measure charged cosmic ray spectra with energies up to the
TeV region and with high energy photon detection capability up to a few hundred
GeV, using state-of-the art particle identification techniques. It is equipped
with several subsystems, one of which is a proximity focusing Ring Imaging
Cherenkov (RICH) detector equipped with a dual radiator (aerogel+NaF), a
lateral conical mirror and a detection plane made of 680 photomultipliers and
light guides, enabling precise measurements of particle electric charge and
velocity (Delta beta / beta ~ 10^-3 and 10^-4 for Z=1 and Z=10-20,
respectively) at kinetic energies of a few GeV/nucleon. Combining velocity
measurements with data on particle rigidity from the AMS-02 Tracker (Delta R /
R ~ 2% for R=1-10 GV) it is possible to obtain a reliable measurement for
particle mass. One of the main topics of the AMS-02 physics program is the
search for indirect signatures of dark matter. Experimental data indicate that
dark, non-baryonic matter of unknown composition is much more abundant than
baryonic matter, accounting for a large fraction of the energy content of the
Universe. Apart from antideuterons produced in cosmic-ray propagation, the
annihilation of dark matter will produce additional antideuteron fluxes.
Detailed Monte Carlo simulations of AMS-02 have been used to evaluate the
detector's performance for mass separation, a key issue for anti-D/anti-p
separation. Results of these studies are presented.


title:
Improved determination of color-singlet nonrelativistic QCD matrix
  elements for S-wave charmonium

abstract:
  We present a new computation of S-wave color-singlet nonrelativistic QCD
matrix elements for the J/psi and the eta_c. We compute the matrix elements of
leading order in the heavy-quark velocity v and the matrix elements of relative
order v^2. Our computation is based on the electromagnetic decay rates of the
J/psi and the eta_c and on a potential model that employs the Cornell
potential. We include relativistic corrections to the electromagnetic decay
rates, resumming a class of corrections to all orders in v, and find that they
significantly increase the values of the matrix elements of leading order in v.
This increase could have important implications for theoretical predictions for
a number of quarkonium decay and production processes. The values that we find
for the matrix elements of relative order v^2 are somewhat smaller than the
values that one obtains from estimates that are based on the velocity-scaling
rules of nonrelativistic QCD.


title: Resummation of Relativistic Corrections to e+ e- -> J/psi+eta_c

abstract:
  We present a new calculation, in the nonrelativistic QCD (NRQCD)
factorization formalism, of the relativistic corrections to the
double-charmonium cross section sigma[e+ e- -> J/psi+eta_c] at the energy of
the Belle and BABAR experiments. In comparison with previous work, our
calculation contains several refinements. These include the use of the improved
results for the nonperturbative NRQCD matrix elements, the resummation of a
class of relativistic corrections, the use of the vector-meson-dominance method
to calculate the fragmentation contribution to the pure QED amplitude, the
inclusion of the effects of the running of alpha, and the inclusion of the
contribution that arises from the interference between the relativistic
corrections and the corrections of next-to-leading order in alpha_s. We also
present a detailed estimate of the theoretical uncertainty. We conclude that
the discrepancy between the theoretical prediction for sigma[e+e- ->
J/psi+eta_c] and the experimental measurements has been resolved.


title: Intelligibility and First Passage Times In Complex Urban Networks

abstract:
  Topology of urban environments can be represented by means of graphs. We
explore the graph representations of several compact urban patterns by random
walks. The expected time of recurrence and the expected first passage time to a
node scales apparently linearly in all urban patterns we have studied In space
syntax theory, a positive relation between the local property of a node
(qualified by connectivity or by the recurrence time) and the global property
of the node (estimated in our approach by the first passage time to it) is
known as intelligibility. Our approach based on random walks allows to extend
the notion of intelligibility onto the entire domain of complex networks and
graph theory.


title: Schwinger model simulations with dynamical overlap fermions

abstract:
  We present simulation results for the 2-flavour Schwinger model with
dynamical overlap fermions. In particular we apply the overlap hypercube
operator at seven light fermion masses. In each case we collect sizable
statistics in the topological sectors 0 and 1. Since the chiral condensate
Sigma vanishes in the chiral limit, we observe densities for the microscopic
Dirac spectrum, which have not been addressed yet by Random Matrix Theory
(RMT). Nevertheless, by confronting the averages of the lowest eigenvalues in
different topological sectors with chiral RMT in unitary ensemble we obtain --
for the very light fermion masses -- values for Sigma that follow closely the
analytical predictions in the continuum.


title:
The nature of the finite temperature QCD transition as a function of the
  quark masses

abstract:
  The finite temperature QCD transition for physical quark masses is a
crossover. For smaller quark masses a first-order phase transition is expected.
Using Symanzik improved gauge and stout improved fermion action for 2+1 flavour
staggered QCD we give estimates/bounds for the phase line separating the
first-order region from the crossover one. The calculations are carried out on
two different lattice spacings. Our conclusion for the critical mass is $m_0
\lesssim 0.07 \cdot m_{phys}$ for $N_T=4$ and $m_0 \lesssim 0.12 \cdot
m_{phys}$ for $N_T=6$ lattices.


title:
Particle Production in an expanding universe dominated by dark energy
  fluid

abstract:
  We investigate the fate of particle production in an expanding universe
dominated by a perfect fluid with equation of state $p = \alpha\rho$. The rate
of particle production, using the Bogolioubov coefficients, are determined
exactly for any value of $\alpha$ in the case of a flat universe. When the
strong energy condition is satisfied, the rate of particle production decreases
as time goes on, in agreement to the fact that the four-dimensional curvature
decreases with the expansion; the opposite occurs when the strong energy
condition is violated. In the phantomic case, the rate of particle production
diverges in a finite time. This may lead to a backreaction effect, leading to
the avoidance of the big rip singularity, specially if $- 1 > \alpha > -
{5/3}$.


title: Electron-Positron Plasma Generation in a Magnetar Magnetosphere

abstract:
  We consider the electron-positron plasma generation processes in the
magnetospheres of magnetars - neutron stars with strong surface magnetic
fields, B = 10^(14) - 10^(15) G. We show that the photon splitting in a
magnetic field, which is effective at large field strengths, does not lead to
the suppression of plasma multiplication, but manifests itself in a high
polarization of gamma-ray photons. A high magnetic field strength does not give
rise to the second generation of particles produced by synchrotron photons.
However, the density of the first-generation particles produced by curvature
photons in the magnetospheres of magnetars can exceed the density of the same
particles in the magnetospheres of ordinary radio pulsars. The plasma
generation inefficiency can be attributed only to slow magnetar rotation, which
causes the energy range of the produced particles to narrow. We have found a
boundary in the P - Pdot diagram that defines the plasma generation threshold
in a magnetar magnetosphere.


title: Connectivity of Random 1-Dimensional Networks

abstract:
  An important problem in wireless sensor networks is to find the minimal
number of randomly deployed sensors making a network connected with a given
probability. In practice sensors are often deployed one by one along a
trajectory of a vehicle, so it is natural to assume that arbitrary probability
density functions of distances between successive sensors in a segment are
given. The paper computes the probability of connectivity and coverage of
1-dimensional networks and gives estimates for a minimal number of sensors for
important distributions.


title:
Absence of gravitational contributions to the running Yang-Mills
  coupling

abstract:
  The question of a modification of the running gauge coupling of (non-)
abelian gauge theories by an incorporation of the quantum gravity contribution
has recently attracted considerable interest. In this letter we perform an
involved diagrammatical calculation in the full Einstein-Yang-Mills system both
in cut-off and dimensional regularization at one loop order. It is found that
all gravitational quadratic divergencies cancel in cut-off regularization and
are trivially absent in dimensional regularization so that there is no
alteration to asymptotic freedom at high energies. The logarithmic divergencies
give rise to an extended effective Einstein-Yang-Mills Lagrangian with a
counterterm of dimension six. In the pure Yang-Mills sector this counterterm
can be removed by a nonlinear field redefinition of the gauge potential,
reproducing a classical result of Deser, Tsao and van Nieuwenhuizen obtained in
the background field method with dimensional regularization.


title:
Structure and dynamics of Oxide Melts and Glasses : a view from
  multinuclear and high temperature NMR

abstract:
  Solid State Nuclear Magnetic Resonance (NMR) experiments allow characterizing
the local structure and dynamics of oxide glasses and melts. Thanks to the
development of new experiments, it now becomes possible to evidence not only
the details of the coordination state of the network formers of glasses but
also to characterize the nature of polyatomic molecular motifs extending over
several chemical bonds. We present results involving 31P homonuclear
experiments that allow description of groups of up to three phosphate units and
27Al/17O heteronuclear that allows evidencing μ3 oxygen bridges in
aluminate glasses and rediscussion of the structure of high temperature melts.


title: Valley polarized electronic beam splitting in graphene

abstract:
  We show how the trigonal warping effect in doped graphene can be used to
produce fully valley polarized currents. We propose a device that acts both as
a beam splitter and a collimator of these electronic currents. The result is
demonstrated trough an optical analogy using two dimensional photonic crystals.


title: Black Hole Initial Data with a Horizon of Prescribed Geometry

abstract:
  The purpose of this work is to construct asymptotically flat, time symmetric
initial data with an apparent horizon of prescribed intrinsic geometry. To do
this, we use the parabolic partial differential equation for prescribing scalar
curvature. In this equation the horizon geometry is contained within the freely
specifiable part of the metric. This contrasts with the conformal method in
which the geometry of the horizon can only be specified up to a conformal
factor.


title: Thermophysical properties of warm dense hydrogen

abstract:
  We study the thermophysical properties of warm dense hydrogen using quantum
molecular dynamics simulations. New results are presented for the pair
distribution functions, the equation of state, the Hugoniot curve, and the
reflectivity. We compare with available experimental data and predictions of
the chemical picture. Especially, we discuss the nonmetal-to-metal transition
which occurs at about 40 GPa in the dense fluid.


title:
Two representation theorems of three-valued structures by means of
  binary relations

abstract:
  The results here presented are a continuation of the algebraic research line
which attempts to find properties of multiple-valued systems based on a poset
of two agents.
  The aim of this paper is to exhibit two relationships between some
three-valued structures and binary relations. The established connections are
so narrow that two representation theorems are obtained.


title: Entanglement: A myth introducing non-locality in any quantum theory

abstract:
  The purposes of the present article are: a) To show that non-locality leads
to the transfer of certain amounts of energy and angular momentum at very long
distances, in an absolutely strange and unnatural manner, in any model
reproducing the quantum mechanical results. b) To prove that non-locality is
the result only of the zero spin state assumption for distant particles, which
explains its presence in any quantum mechanical model. c) To reintroduce
locality, simply by denying the existence of the zero spin state in nature (the
so-called highly correlated, or EPR singlet state) for particles
non-interacting with any known field. d) To propose a realizable experiment to
clarify if two remote (and thus non-interacting with a known field) particles,
supposed to be correlated as in Bell-type experiments, are actually in zero
spin state.


title: Magnetic phase diagrams of the Kagome staircase compound Co3V2O8

abstract:
  At zero magnetic field, a series of five phase transitions occur in Co3V2O8.
The Neel temperature, TN=11.4 K, is followed by four additional phase changes
at T1=8.9 K, T2=7.0 K, T3=6.9 K, and T4=6.2 K. The different phases are
distinguished by the commensurability of the b-component of its spin density
wave vector. We investigate the stability of these various phases under
magnetic fields through dielectric constant and magnetic susceptibility
anomalies. The field-temperature phase diagram of Co3V2O8 is completely
resolved. The complexity of the phase diagram results from the competition of
different magnetic states with almost equal ground state energies due to
competing exchange interactions and frustration.


title: Binaries at Low Metallicity: ranges for case A, B and C mass transfer

abstract:
  The evolution of single stars at low metallicity has attracted a large
interest, while the effect of metallicity on binary evolution remains still
relatively unexplored. We study the effect of metallicity on the number of
binary systems that undergo different cases of mass transfer. We find that
binaries at low metallicity are more likely to start transferring mass after
the onset of central helium burning, often referred to as case C mass transfer.
In other words, the donor star in a metal poor binary is more likely to have
formed a massive CO core before the onset of mass transfer.
  At solar metallicity the range of initial binary separations that result in
case C evolution is very small for massive stars, because they do not expand
much after the ignition of helium and because mass loss from the system by
stellar winds causes the orbit to widen, preventing the primary star to fill
its Roche lobe. This effect is likely to have important consequences for the
metallicity dependence of the formation rate of various objects through binary
evolution channels, such as long GRBs, double neutron stars and double white
dwarfs.


title: Measurements of plasma motions in dynamic fibrils

abstract:
  We present a 40 minute time series of filtergrams from the red and the blue
wing of the \halpha line in an active region near the solar disk center. From
these filtergrams we construct both Dopplergrams and summed ``line center''
images. Several dynamic fibrils (DFs) are identified in the summed images. The
data is used to simultaneously measure the proper motion and the Doppler
signals in DFs. For calibration of the Doppler signals we use spatially
resolved spectrograms of a similar active region. Significant variations in the
calibration constant for different solar features are observed, and only
regions containing DFs have been used in order to reduce calibration errors. We
find a coherent behavior of the Doppler velocity and the proper motion which
clearly demonstrates that the evolution of DFs involve plasma motion. The
Doppler velocities are found to be a factor 2--3 smaller than velocities
derived form proper motions in the image plane. The difference can be explained
by the radiative processes involved, the Doppler velocity is a result of the
local atmospheric velocity weighted with the response function. As a result the
Doppler velocity originates from a wide range in heights in the atmosphere.
This is contrasted by the proper motion velocity which is measured from the
sharply defined bright tops of the DFs and is therefore a very local velocity
measure. The Doppler signal originates from well below the top of the DF.
Finally we discuss how this difference together with the lacking spatial
resolution of older observations have contributed to some of the confusion
about the identity of DFs, spicules and mottles.


title: Expansion dynamics of Lennard-Jones systems

abstract:
  The dynamics of the expansion of a Lennard-Jones system, initially confined
at high density and subsequently expanding freely in the vacuum, is confronted
to an expanding statistical ensemble, derived in the diluted quasi-ideal
Boltzmann approximation. The description proves to be fairly accurate at
predicting average one-body global observables, but important deviations are
observed in the configuration-space structure of the events. Possible
implications for finite expanding physical systems are outlined.


title: SUSY Searches in All-Hadronic States with Large MET at the LHC

abstract:
  The CMS and ATLAS search strategy for SUSY in inclusive multijet plus high
missing transverse energy final states is reviewed. This canonical SUSY
signature may be a viable discovery channel for low mass SUSY in the early
phase of the LHC. Methods for Standard Model background estimates, MET studies
and filters for instrumental background are presented.


title: Wealth distribution in a System with Wealth-limited Interactions

abstract:
  We model a closed economic system with interactions that generates the
features of empirical wealth distribution across all wealth brackets, namely a
Gibbsian trend in the lower and middle wealth range and a Pareto trend in the
higher range, by simply limiting the an agents' interaction to only agents with
nearly the same wealth. To do this, we introduce a parameter BETA that limits
the range on the wealth of a partner with which an agent is allowed to
interact. We show that this wealth-limited interaction is enough to distribute
wealth in a purely power law trend. If the interaction is not wealth limited,
the wealth distribution is expectedly Gibbsian. The value of BETA where the
transition from a purely Gibbsian law to a purely power law distribution
happens depends on whether the choice of interaction partner is mutual nor not.
For a non-mutual choice, where the richer agent gets to decide, the transition
happens at BETA=1.0. For a mutual choice, the transition is at BETA= 0.60. In
order to generate a mixed Gibbs-Pareto distribution, we apply another
wealth-based rule that depends on the parameter w_limit. An agent whose wealth
is below w_limit can choose any partner to interact with, while an agent whose
wealth is above w_limit is subject to the wealth-limited range in his choice of
partner. A Gibbs-Pareto distribution appears if both these wealth-based rules
are applied.


title:
Concerning verification of the Nernst theorem for Casimir-Lifshitz free
  energy

abstract:
  By regarding the Lifshitz expression for the Casimir free energy on the real
frequency axis rather than the imaginary Matsubara frequencies as is customary,
new light is shed on the ongoing debate regarding the thermodynamical
consistency of this theory in combination with common permittivity models. It
is argued that when permittivity is temperature independent over a temperature
interval including zero temperature, a cavity made of causal material with
continuous dispersion properties separated by vacuum cannot violate Nernst's
theorem (the third law of thermodynamics). The purported violation of this
theorem pertains to divergencies in the double limit in which frequency and
temperature vanish simultaneously. While any model should abide by the laws of
thermodynamics within its range of applicability, we emphasise that the Nernst
heat theorem is a relevant criterion for choosing amongst candidate theories
only when these theories are fully applicable at zero temperature and
frequency.


title: Search for Scalar Top Admixture in the ttbar Lepton+Jets Channel at D0

abstract:
  A search has been performed for scalar top quark pair production in the
lepton+jets channel in ~1 fb^(-1) of data. Kinematic differences between the
exotic stop-stopbar and the dominant ttbar process are used to separate the two
possible contributions. For scalar top quark masses of 145-175 GeV and chargino
masses of 105-135 GeV we obtain upper cross section limits at 95% confidence
level for stop-stopbar production that are a factor of ~7-12 higher than
expected for the Minimal Supersymmetric Standard Model (MSSM).


title: Morita theory of comodules over corings

abstract:
  By a theorem due to Kato and Ohtake, any (not necessarily strict) Morita
context induces an equivalence between appropriate subcategories of the module
categories of the two rings in the Morita context. These are in fact categories
of firm modules for non-unital subrings. We apply this result to various Morita
contexts associated to a comodule $\Sigma$ of an $A$-coring $\cC$. This allows
to extend (weak and strong) structure theorems in the literature, in particular
beyond the cases when any of the coring $\cC$ or the comodule $\Sigma$ is
finitely generated and projective as an $A$-module. That is, we obtain
relations between the category of $\cC$-comodules and the category of firm
modules for a firm ring $R$, which is an ideal of the endomorphism algebra
$^\cC(\Sigma)$. For a firmly projective comodule of a coseparable coring we
prove a strong structure theorem assuming only surjectivity of the canonical
map.


title:
Probing the Neutral Fraction of the IGM with GRBs during the Epoch of
  Reionization

abstract:
  We show that near-infrared observations of the red side of the Ly-alpha line
from a single gamma ray burst (GRB) afterglow cannot be used to constrain the
global neutral fraction of the intergalactic medium (IGM), x_H, at the GRB's
redshift to better than ~0.3. Some GRB sight-lines will encounter more neutral
hydrogen than others at fixed x_H owing to the patchiness of reionisation. GRBs
during the epoch of reionization will often bear no discernible signature of a
neutral IGM in their afterglow spectra. We discuss the constraints on x_H from
the z = 6.3 burst, GRB050904, and quantify the probability of detecting a
neutral IGM using future spectroscopic observations of high-redshift,
near-infrared GRB afterglows. Assuming an observation with signal-to-noise
similar to the Subaru FOCAS spectrum of GRB050904 and that the column density
distribution of damped Ly-alpha absorbers is the same as measured at lower
redshifts, a GRB from an epoch when x_H = 0.5 can be used to detect a partly
neutral IGM at 98% confidence level 10% of the time (and, for an observation
with three times the sensitivity, 30% of the time).


title: Generic fiber of power series ring extensions

abstract:
  Let D be a Noetherian domain containing a field, d a nonzero nonunit of D and
z an indeterminate over D. We prove that the generic fiber of D[1/d][[z]] over
D[[z]] has dimension greater than the dimension of D/dD.


title:
First-principles calculation of the temperature dependence of the
  optical response of bulk GaAs

abstract:
  A novel approach has been developed to calculate the temperature dependence
of the optical response of a semiconductor. The dielectric function is averaged
over several thermally perturbed configurations that are extracted from
molecular dynamic simulations. The calculated temperature dependence of the
imaginary part of the dielectric function of GaAs is presented in the range
from 0 to 700 K. This approach that explicitly takes into account lattice
vibrations describes well the observed thermally-induced energy shifts and
broadening of the dielectric function.


title: Avalanche dynamics of radio pulsar glitches

abstract:
  We test statistically the hypothesis that radio pulsar glitches result from
an avalanche process, in which angular momentum is transferred erratically from
the flywheel-like superfluid in the star to the slowly decelerating, solid
crust via spatially connected chains of local, impulsive, threshold-activated
events, so that the system fluctuates around a self-organised critical state.
Analysis of the glitch population (currently 285 events from 101 pulsars)
demonstrates that the size distribution in individual pulsars is consistent
with being scale invariant, as expected for an avalanche process. The
waiting-time distribution is consistent with being exponential in seven out of
nine pulsars where it can be measured reliably, after adjusting for
observational limits on the minimum waiting time, as for a constant-rate
Poisson process. PSR J0537$-$6910 and PSR J0835$-$4510 are the exceptions;
their waiting-time distributions show evidence of quasiperiodicity. In each
object, stationarity requires that the rate $\lambda$ equals $- \epsilon
\dot{\nu} / <\Delta\nu>$, where $\dot{\nu}$ is the angular acceleration of the
crust, $<\Delta\nu>$ is the mean glitch size, and $\epsilon\dot{\nu}$ is the
relative angular acceleration of the crust and superfluid. There is no evidence
that $\lambda$ changes monotonically with spin-down age. The rate distribution
itself is fitted reasonably well by an exponential for $\lambda \geq 0.25 {\rm
yr^{-1}}$. For $\lambda < 0.25 {\rm yr^{-1}}$, its exact form is unknown; the
exponential overestimates the number of glitching pulsars observed at low
$\lambda$, where the limited total observation time exercises a selection bias.


title:
Conservative evaluation of the uncertainty in the LAGEOS-LAGEOS II
  Lense-Thirring test

abstract:
  We deal with the test of the general relativistic gravitomagnetic
Lense-Thirring effect currently ongoing in the Earth's gravitational field with
the combined nodes \Omega of the laser-ranged geodetic satellites LAGEOS and
LAGEOS II.
  One of the most important source of systematic uncertainty on the orbits of
the LAGEOS satellites, with respect to the Lense-Thirring signature, is the
bias due to the even zonal harmonic coefficients J_L of the multipolar
expansion of the Earth's geopotential which account for the departures from
sphericity of the terrestrial gravitational potential induced by the
centrifugal effects of its diurnal rotation. The issue addressed here is: are
the so far published evaluations of such a systematic error reliable and
realistic? The answer is negative. Indeed, if the difference \Delta J_L among
the even zonals estimated in different global solutions (EIGEN-GRACE02S,
EIGEN-CG03C, GGM02S, GGM03S, ITG-Grace02, ITG-Grace03s, JEM01-RL03B, EGM2008,
AIUB-GRACE01S) is assumed for the uncertainties \delta J_L instead of using
their more or less calibrated covariance sigmas \sigma_{J_L}, it turns out that
the systematic error \delta\mu in the Lense-Thirring measurement is about 3 to
4 times larger than in the evaluations so far published based on the use of the
sigmas of one model at a time separately, amounting up to 37% for the pair
EIGEN-GRACE02S/ITG-Grace03s. The comparison among the other recent GRACE-based
models yields bias as large as about 25-30%. The major discrepancies still
occur for J_4, J_6 and J_8, which are just the zonals the combined
LAGEOS/LAGOES II nodes are most sensitive to.

categories: gr-qc astro-ph physics.geo-ph physics.space-ph


title:
Scaling relations of the colour-detected cluster RzCS 052 at z=1.016 and
  of some other high redshift clusters

abstract:
  We report on the discovery of the z=1.016 cluster RzCS 052 using a modified
red sequence method, followup spectroscopy and X-ray imaging. This cluster has
a velocity dispersion of 710+-150 km/s, a virial mass of 4.0e14 Msol (based on
21 spectroscopically confirmed members) and an X-ray luminosity of (0.68+-
0.47)e44 ergs/s in the [1-4] keV band. This optically selected cluster appears
to be of richness class 3 and to follow the known L_X-sigma_v relation for high
redshift X-ray selected clusters. Using these data, we find that the halo
occupation number for this cluster is only marginally consistent with what
expected assuming a self-similar evolution of cluster scaling relations,
suggesting perhaps a break of them at z~1. We also rule out a strong galaxy
merging activity between z=1 and today. Finally, we present a Bayesian approach
to measuring cluster velocity dispersions and X-ray luminosities in the
presence of a background: we critically reanalyze recent claims for X-ray
underluminous clusters using these techniques and find that the clusters can be
accommodated within the existing L_X -sigma_v relation.


title: An elementary construction of Anick's fibration

abstract:
  Cohen, Moore, and Neisendorfer's work on the odd primary homotopy theory of
spheres and Moore spaces, as well as the first author's work on the secondary
suspension, predicted the existence of a p-local fibration S^2n-1 --> T -->
\Omega S^2n+1 whose connecting map is degree p^r. In a long and complex
monograph, Anick constructed such a fibration for p>= 5 and r>= 1. Using new
methods we give a much more conceptual construction which is also valid for p=3
and r>= 1. We go on to establish several properties of the space T.


title: Stability domains of actin genes and genomic evolution

abstract:
  In eukaryotic genes the protein coding sequence is split into several
fragments, the exons, separated by non-coding DNA stretches, the introns.
Prokaryotes do not have introns in their genome. We report the calculations of
stability domains of actin genes for various organisms in the animal, plant and
fungi kingdoms. Actin genes have been chosen because they have been highly
conserved during evolution. In these genes all introns were removed so as to
mimic ancient genes at the time of the early eukaryotic development, i.e.
before introns insertion. Common stability boundaries are found in evolutionary
distant organisms, which implies that these boundaries date from the early
origin of eukaryotes. In general boundaries correspond with introns positions
of vertebrates and other animals actins, but not much for plants and fungi. The
sharpest boundary is found in a locus where fungi, algae and animals have
introns in positions separated by one nucleotide only, which identifies a
hot-spot for insertion. These results suggest that some introns may have been
incorporated into the genomes through a thermodynamic driven mechanism, in
agreement with previous observations on human genes. They also suggest a
different mechanism for introns insertion in plants and animals.

categories: q-bio.BM cond-mat.stat-mech physics.bio-ph q-bio.PE


title: The Schur group of an abelian number field

abstract:
  We characterize the maximum $r$-local index of a Schur algebra over an
abelian number field $K$ in terms of global information determined by the field
$K$, for $r$ an arbitrary rational prime. This completes and unifies previous
results of Janusz and Pendergrass.


title:
The gap between the Schur group and the subgroup generated by cyclic
  cyclotomic algebras

abstract:
  Let $K$ be an abelian extension of the rationals. Let $S(K)$ be the Schur
group of $K$ and let $CC(K)$ be the subgroup of $S(K)$ generated by classes
containing cyclic cyclotomic algebras. We characterize when $CC(K)$ has finite
index in $S(K)$ in terms of the relative position of $K$ in the lattice of
cyclotomic extensions of the rationals.


title:
Gemini Spectroscopy and HST Imaging of the Stellar Cluster Population in
  Region B of M82

abstract:
  We present new spectroscopic observations of the stellar cluster population
of region B in the prototype starburst galaxy M82 obtained with the Gillett
Gemini-North 8.1-metre telescope. By coupling the spectroscopy with UBVI
photometry acquired with the Advanced Camera for Surveys (ACS) on the Hubble
Space Telescope (HST), we derive ages, extinctions and radial velocities for
seven young massive clusters (YMCs) in region B. We find the clusters to have
ages between 70 and 200 Myr and velocities in the range 230 to 350 km/s, while
extinctions Av vary between ~1-2.5 mag. We also find evidence of differential
extinction across the faces of some clusters which hinders the photometric
determination of ages and extinctions in these cases. The cluster radial
velocities indicate that the clusters are located at different depths within
the disk, and are on regular disk orbits. Our results overall contradict the
findings of previous studies, where region B was thought to be a bound region
populated by intermediate-age clusters that formed in an independent, offset
starburst episode that commenced 600 Myr-1 Gyr ago. Our findings instead
suggest that region B is optically bright because of low extinction patches,
and this allows us to view the cluster population of the inner M82 disk, which
probably formed as a result of the last encounter with M81. This study forms
part of a series of papers aimed at studying the cluster population of M82
using deep optical spectroscopy and multi-band photometry.


title: QCD sum rules study of the meson Z^+(4430)

abstract:
  We use QCD sum rules to study the recently observed meson $Z^+(4430)$,
considered as a $D^*D_1$ molecule with $J^{P}=0^{-}$. We consider the
contributions of condensates up to dimension eight and work at leading order in
$\alpha_s$. We get $m_Z=(4.40\pm0.10) \GeV$ in a very good agreement with the
experimental value. We also make predictions for the analogous mesons $Z_{s}$
and $Z_{bb}$ considered as $D_s^*D_1$ and $B^*B_1$ molecules respectively. For
$Z_{s}$ we predict $m_{Z_{s}}= (4.70\pm 0.06) {\rm GeV}$, which is above the
$D_s^*D_1$ threshold, indicating that it is probably a very broad state and,
therefore, difficult to be experimentally seen. For $Z_{bb}$ we predict
$m_{Z_{bb}}= (10.74\pm 0.12) {\rm GeV}$, in agreement with quark model
predictions.


title:
Bethe Ansatz in the Bernoulli Matching Model of Random Sequence
  Alignment

abstract:
  For the Bernoulli Matching model of sequence alignment problem we apply the
Bethe ansatz technique via an exact mapping to the 5--vertex model on a square
lattice. Considering the terrace--like representation of the sequence alignment
problem, we reproduce by the Bethe ansatz the results for the averaged length
of the Longest Common Subsequence in Bernoulli approximation. In addition, we
compute the average number of nucleation centers of the terraces.


title: Thermodynamics of statistically interacting quantum gas in D dimensions

abstract:
  We present the exact thermodynamics (isochores, isotherms, isobars, response
functions) of a statistically interacting quantum gas in D dimensions. The
results in D=1 are those of the thermodynamic Bethe ansatz for the nonlinear
Schroedinger model, a gas with repulsive two-body contact potential. In all
dimensions the ideal boson and fermion gases are recovered in the weak-coupling
and strong-coupling limits, respectively. For all nonzero couplings ideal
fermion gas behavior emerges for D>>1 and, in the limit D->infinity, a phase
transition occurs at T>0. Significant deviations from ideal quantum gas
behavior are found for intermediate coupling and finite D.


title: The very first Pop III stars and their relation to bright z~6 quasars

abstract:
  We discuss the link between dark matter halos hosting the first PopIII stars
formed at redshift z > 40 and the rare, massive, halos that are generally
considered to host bright z~6 quasars. We show that within the typical volume
occupied by one bright high-z QSO the remnants of the first several thousands
PopIII stars formed do not end up in the most massive halos at z~6, but rather
live in a large variety of environments. The black hole seeds planted by these
very first PopIII stars can easily grow to M > 10^{9.5} Msun by z=6 assuming
Eddington accretion with radiative efficiency epsilon~0.1. Therefore quenching
of the accretion is crucial to avoid an overabundance of supermassive black
holes. We implement a simple feedback model for the growth of the seeds planted
by PopIII stars and obtain a z~6 BH mass function consistent with the observed
QSO luminosity function.


title: Dissipation of Quantum Turbulence in the Zero Temperature Limit

abstract:
  Turbulence, produced by an impulsive spin-down from angular velocity Omega to
rest of a cube-shaped container, is investigated in superfluid 4He at
temperatures 0.08 K - 1.6 K. The density of quantized vortex lines L is
measured by scattering negative ions. Homogeneous turbulence develops after
time t of approximately 20 \Omega and decays as L proportional to t^(-3/2). The
corresponding energy flux epsilon = nu' (kappa L)^2, which is proportional to
t^(-3), is characteristic of quasi-classical turbulence at high Re with a
saturated energy-containing length. The effective kinematic viscosity in the
T=0 limit is nu' = 0.003 kappa, where kappa=10^(-3) cm^2 / s is the circulation
quantum.


title: Pressure induced variation of the ground state of CeAl3

abstract:
  Pressure-induced variations of $^{27}$Al NMR spectra of CeAl$_3$ indicate
significant changes in the ground-state characteristics of this prototypical
heavy-electron compound. Previously reported magnetic and electronic
inhomogeneities at ambient pressure and very low temperatures are removed with
external pressures exceeding 1.2 kbar. The spectra and results of corresponding
measurements of the NMR spin-lattice relaxation rates indicate a
pressure-induced emergence of a simple paramagnetic state involving electrons
with moderately enhanced masses and no magnetic order above 65 mK.


title:
Two level anti-crossings high up in the single-particle energy spectrum
  of a quantum dot

abstract:
  We study the evolution with magnetic field of the single-particle energy
levels high up in the energy spectrum of one dot as probed by the ground state
of the adjacent dot in a weakly coupled vertical quantum dot molecule. We find
that the observed spectrum is generally well accounted for by the calculated
spectrum for a two-dimensional elliptical parabolic confining potential, except
in several regions where two or more single-particle levels approach each
other. We focus on two two-level crossing regions which show unexpected
anti-crossing behavior and contrasting current dependences. Within a simple
coherent level mixing picture, we can model the current carried through the
coupled states of the probed dot provided the intrinsic variation with magnetic
field of the current through the states (as if they were uncoupled) is
accounted for by an appropriate interpolation scheme.