title: Extended Schouten classification for non-Riemannian geometries

abstract:
  A generalized connection, including Christoffel coefficients, torsion,
non-metricity tensor and metric-asymmetricity object, is analyzed according to
the Schouten classification. The inverse structure matrix is found in the
linearized regime, autoparallel trajectories are defined and the contribution
of the components of the connection are clarified at first-order approximation.


title: Effect algebras with the maximality property

abstract:
  The maximality property was introduced in in orthomodular posets as a common
generalization of orthomodular lattices and orthocomplete orthomodular posets.
We show that various conditions used in the theory of effect algebras are
stronger than the maximality property, clear up the connections between them
and show some consequences of these conditions. In particular, we prove that a
Jauch--Piron effect algebra with a countable unital set of states is an
orthomodular lattice and that a unital set of Jauch--Piron states on an effect
algebra with the maximality property is strongly order determining.


title: Picard groups of Siegel modular threefolds and theta lifting

abstract:
  We show that the Humbert surfaces rationally generate the Picard groups of
Siegel modular threefolds.


title:
Isometries Groups and a Multiresolution Analysis on Sub-Riemannian
  Manifolds

abstract:
  In this letter we exhibit the relation between the isometries of a Riemannian
contraction of a sub-Riemannian manifold and those of the sub-Riemannian
metric, for to use this relation with two goals: establishing a result about
the existence of fixed points of isometries groups; and the other, defining a
Multiresolution Analysis (MRA) on sub-Riemannian manifolds that it will permit
to obtain Haar's bases on the manifolds before mentioned.
  Keywords: Sub-Riemannian geometry, minimizing geodesic, Haar functions,
self-similarity.


title:
The Peculiar Horizontal Branch Morphology of the Galactic Globular
  Clusters NGC6388 and NGC6441

abstract:
  I present multiband optical and UV Hubble Space Telescope photometry of the
two Galactic globular clusters NGC6388 and NGC6441, in order to investigate the
nature of the physical mechanism(s) responsible for the existence of an
extended blue tail and of a slope in the horizontal branch. Further evidence
that the horizontal branch tilt cannot be interpreted as an effect of
differential reddening is provided, while I show that a possible solution of
the puzzle is to assume that a small fraction of the stellar population in the
two clusters is strongly helium enriched.


title: On gravitational-electromagnetic resonance

abstract:
  This is an English translation of the paper M.B.Mensky, in: K.P.Stanyukovich
(ed.), "Problems of Theory of Gravity and Elementary Particles", issue 6,
Moscow, Atomizdat, 1975, p.181-190 (in Russian). This paper elaborates further
the idea (formulated in 1971 by Braginsky and Mensky) of detecting
high-frequency gravitational waves by observing resonance action of a
gravitational wave on the electromagnetic wave in a closed resonator
(waveguide). The phenomenon underlying such a detector was called
gravitational-electromagnetic resonance (GER). In the present paper both closed
(for example circular) resonator or waveguide and long (for example in the
shape of a spiral) waveguide are considered as possible gravitational-wave
detectors. High-frequency gravitational-wave detectors are now again actual
(see A.M.Cruise and R.M.J.Ingley, Class. Quant. Grav. 22, S479, 2005), but the
current literature on this topic does not cover all the issues discussed in the
present paper.


title:
Dynamic method to distinguish between left- and right-handed chiral
  molecules

abstract:
  We study quantum systems with broken symmetry that can be modelled as cyclic
three-level atoms with coexisting one- and two-photon transitions. They can be
selectively optically excited to any state. As an example, we show that left-
and right-handed chiral molecules starting in the same initial states can
evolve into different final states by a purely dynamic transfer process. That
means, left- and right-handed molecules can be distinguished purely
dynamically.


title: Kinks in the electronic specific heat

abstract:
  We find that the heat capacity of a strongly correlated metal presents
striking changes with respect to Landau Fermi liquid theory. In contrast with
normal metals, where the electronic specific heat is linear at low temperature
(with a T^3 term as a leading correction), a dynamical mean-field study of the
correlated Hubbard model reveals a clear kink in the temperature dependence,
marking a rapid change from a low-temperature linear behavior and a second
linear regime with a reduced slope. Experiments on LiV2O4 support our findings,
implying that correlated materials are more resistive to cooling at low T than
expected from the intermediate temperature behavior.


title:
Resolved Stellar Populations Constituting Extended UV Disks (XUV-disks)
  in Nearby Galaxies

abstract:
  We describe HST imaging of recent star formation complexes located in the
extended UV disk (XUV-disk) component of NGC 5236 (M 83), NGC 5055 (M 63), and
NGC 2090. Photometry in four FUV--visible bands permits us to constrain the
type of resolved stars and effective age of clusters, in addition to
extinction. The preliminary results given herein focus on CMD analysis and
clustering properties in this unique star-forming environment.


title: The rate of convergence of spectra of sample covariance matrices

abstract:
  It is shown that the Kolmogorov distance between the spectral distribution
function of a random covariance matrix $\frac1p XX^T$, where $X$ is a $n\times
p$ matrix with independent entries and the distribution function of the
Marchenko-Pastur law is of order $O(n^{-1/2})$. The bounds hold {\it uniformly}
for any $p$, including $\frac pn$ equal or close to 1.


title:
Riemannian and non-Riemannian extensions of geometrodynamics versus
  Einsteinian gravity

abstract:
  We analyze some extensions of General Relativity. Within the framework of
modified gravity, the Newtonian limit of a class of gravitational actions is
discussed on the basis of the corresponding scalar-tensor model. For a
generalized asymmetric metric, autoparallel trajectories are defined under
suitable conditions at first approximation order.


title: Status and recent results from the Pierre Auger Observatory

abstract:
  We present the status and the recent measurements from the Pierre Auger
Observatory. The energy spectrum will be described and its steepening
discussed. The mass composition is addressed with the measurements of the
variation of the depth of shower maximum with energy. We also report on upper
limits in the primary photon fraction. And finally, searches for anisotropies
of cosmic rays arrival directions are reported.


title: Time-separated entangled light pulses from a single-atom emitter

abstract:
  The controlled interaction between a single, trapped, laser-driven atom and
the mode of a high-finesse optical cavity allows for the generation of
temporally separated, entangled light pulses. Entanglement between the
photon-number fluctuations of the pulses is created and mediated via the atomic
center-of-mass motion, which is interfaced with light through the mechanical
effect of atom-photon interaction. By means of a quantum noise analysis we
determine the correlation matrix which characterizes the entanglement, as a
function of the system parameters. The scheme is feasible in experimentally
accessible parameter regimes. It may be easily extended to the generation of
entangled pulses at different frequencies, even at vastly different
wavelengths.


title:
Passive systems with a normal main operator and quasi-selfadjoint
  systems

abstract:
  Passive systems $\tau={T,M,N,H}$ with $M$ and $N$ as an input and output
space and $H$ as a state space are considered in the case that the main
operator on the state space is normal. Basic properties are given and a general
unitary similarity result involving some spectral theoretic conditions on the
main operator is established. A passive system $\tau$ with $M=N$ is said to be
quasi-selfadjoint if $ran(T-T^*)\subset N$. The subclass $S^{qs}$ of the Schur
class $S$ is the class formed by all transfer functions of quasi-selfadjoint
passive systems. The subclass $S^{qs}$ is characterized and minimal passive
quasi-selfadjoint realizations are studied. The connection between the transfer
function belonging to the subclass $S^{qs}$ and the $Q$-function of $T$ is
given.


title: Subelliptic Bourgain-Brezis Estimates on Groups

abstract:
  We show that divergence free vector fields which belong to L^1 on stratified,
nilpotent groups are in the dual space of functions whose sub-gradient are L^Q
integrable where Q is the homogeneous dimension of the group. This was first
obtained on Euclidean space by Bourgain and Brezis.


title:
Empirical Fit to Precision Inclusive Electron-Proton Cross Sections in
  the Resonance Region

abstract:
  An empirical fit is described to measurements of inclusive inelastic
electron-proton cross sections in the kinematic range of four-momentum transfer
$0 \le Q^2<8$ GeV$^2$ and final state invariant mass $1.1<W<3.1$ GeV. The fit
is constrained by the recent high precision longitudinal and transverse (L/T)
separated cross section measurements from Jefferson Lab Hall C, un-separated
Hall C measurements up to $Q^2$ $\approx 7.5$ ${\rm GeV}^2$, and
photoproduction data at $Q^2 = 0$. Compared to previous fits, the present fit
covers a wider kinematic range, fits both transverse and longitudinal cross
sections, and features smooth transitions to the photoproduction data at
$Q^2=0$ and DIS data at high $Q^2$ and $W$.


title:
Collinear Singularities and Running Coupling Corrections to Gluon
  Production in CGC

abstract:
  We analyze the structure of running coupling corrections to the gluon
production cross section in the projectile-nucleus collisions calculated in the
Color Glass Condensate (CGC) framework. We argue that for the gluon production
cross section (and for gluon transverse momentum spectra and multiplicity) the
inclusion of running coupling corrections brings in collinear singularities due
to final state splittings completely unaffected by CGC resummations. Hence,
despite the saturation/CGC dynamics, the gluon production cross section is not
infrared-safe. As usual, regularizing the singularities requires an infrared
cutoff Lambda_coll that defines a resolution scale for gluons. We specifically
show that the cutoff enters the gluon production cross section in the argument
of the strong coupling constant alpha_s(Lambda_coll^2). We argue that for
hadron production calculations one should be able to absorb the collinear
divergence into a fragmentation function. The singular collinear terms in the
gluon production cross section are shown not to contribute to the energy
density of the produced matter, which is indeed an infrared-finite quantity.


title:
Elimination with applications to singularities in positive
  characteristic

abstract:
  We present an application of elimination theory to the study of singularities
over arbitrary fields, particularly to the open problem of resolution. A
partial extension of a function, defining resolution of singularities over
fields of characteristic zero, is discussed here in positive characteristic.


title:
Thermalization of a color glass condensate and review of the "Bottom-Up"
  scenario

abstract:
  Thermalization of a longitudinally expanding color glass condensate with
Bjorken boost invariant geometry is investigated within microscopical parton
cascade BAMPS. Our main focus lies on the detailed comparison of
thermalization, observed in BAMPS with that suggested in the \BUp scenario. We
demonstrate that the tremendous production of soft gluons via $gg \to ggg$,
which is shown in the \BUp picture as the dominant process during the early
preequilibration, will not occur in heavy ion collisions at RHIC and LHC
energies, because the back reaction $ggg\to gg$ hinders the absolute particle
multiplication. Moreover, different from the \BUp scenario, soft and hard
gluons thermalize at the same time. The time scale of thermal equilibration
obtained from BAMPS calculations is of order $\as^{-2} (\ln \as)^{-2}
Q_s^{-1}$. After this time the gluon system exhibits nearly hydrodynamical
behavior. The shear viscosity to entropy density ratio has weak dependence on
$Q_s$ and lies close to the lower bound from the AdS/CFT conjecture.


title: Nonparametric estimation for a stochastic volatility model

abstract:
  Consider discrete time observations (X_{\ell\delta})_{1\leq \ell \leq n+1}$
of the process $X$ satisfying $dX_t= \sqrt{V_t} dB_t$, with $V_t$ a
one-dimensional positive diffusion process independent of the Brownian motion
$B$. For both the drift and the diffusion coefficient of the unobserved
diffusion $V$, we propose nonparametric least square estimators, and provide
bounds for theirrisk. Estimators are chosen among a collection of functions
belonging to a finite dimensional space whose dimension is selected by a data
driven procedure. Implementation on simulated data illustrates how the method
works.


title: A dynamical system using the Voronoi tessellation

abstract:
  We introduce a dynamical system based on the vertices of Voronoi
tessellations. This dynamical system acts on finite or discrete point sets in
the plane, taking a point set to the vertex set of its Voronoi tessellation. We
explore the behavior of this system for small point sets, then prove a general
result quantifying the growth of the sizes of the point sets under iteration.
We conclude by giving the most interesting open problems.


title:
Comparison between numerical relativity and a new class of
  post-Newtonian gravitational-wave phase evolutions: the non-spinning
  equal-mass case

abstract:
  We compare the phase evolution of equal-mass nonspinning black-hole binaries
from numerical relativity (NR) simulations with post-Newtonian (PN) results
obtained from three PN approximants: the TaylorT1 and T4 approximants, for
which NR-PN comparisons have already been performed in the literature, and the
recently proposed approximant TaylorEt. The accumulated phase disagreement
between NR and PN results over the frequency range $M\omega = 0.0455$ to
$M\omega = 0.1$ is greater for TaylorEt than either T1 or T4, but has the
attractive property of decreasing monotonically as the PN order is increased.


title: Comments on Multiple M2-branes

abstract:
  Recently a three-dimensional field theory was derived that is consistent with
all the symmetries expected of the worldvolume action for multiple M2-branes.
In this note we examine several physical predictions of this model and show
that they are in agreement with expected M2-brane dynamics. In particular, we
discuss the quantization of the Chern-Simons coefficient, the vacuum moduli
space, a massive deformation leading to fuzzy three-sphere vacua, and a
possible large n limit. In this large n limit, the fuzzy funnel solution
correctly reproduces the mass of an M5-brane.


title:
Self-Consistent Ornstein-Zernike approximation for the Yukawa fluid with
  improved direct correlation function

abstract:
  Thermodynamic consistency of the Mean Spherical Approximation as well as the
Self-Consistent Ornstein-Zernike Approximation (SCOZA) with the virial route to
thermodynamics is analyzed in terms of renormalized gamma-ordering. For
continuum fluids this suggests the addition of a short-range contribution to
the usual SCOZA direct correlation function, and the shift of the adjustable
parameter from the potential term to this new term. The range of this
contribution is fixed by imposing consistency with the virial route at the
critical point. Comparison of the results of our theory for the hard-core
Yukawa potential with simulation data show very good agreement for cases where
the liquid-vapor transition is stable or not too far into the metastable region
with respect to the solid state. In the latter case for extremely short-ranged
interactions discrepancies arise.


title:
Polymer chain generation for coarse-grained models using radical-like
  polymerization

abstract:
  An innovative method is proposed to generate configurations of coarse grained
models for polymer melts. This method, largely inspired by chemical ``radical
polymerization'', is divided in three stages: (i) nucleation of radicals
(reacting molecules caching monomers); (ii) growth of chains within a solvent
of monomers; (iii) termination: annihilation of radicals and removal of
residual monomers. The main interest of this method is that relaxation is
performed as chains are generated. Pure mono and poly-disperse polymers melts
are generated and compared to the configurations generated by the Push Off
method from Auhl et al.. A detailed study of the static properties (gyration
radius, mean square internal distance, entanglement length) confirms that the
radical-like polymerization technics is suitable to generate equilibrated
melts. The method is flexible, and can be adapted to generate nano-structured
polymers, namely diblock and triblock copolymers.


title: Heavy-light mesons in lattice HQET and QCD

abstract:
  We present a study of a combination of HQET and relativistic QCD to extract
the b-quark mass and the Bs-meson decay constant from lattice quenched
simulations. We start from a small volume, where one can directly simulate the
b-quark, and compute the connection to a large volume, where finite size
effects are negligible, through a finite size technique. The latter consists of
steps extrapolated to the continuum limit, where the b-region is reached
through interpolations guided by the effective theory.
  With the lattice spacing given in terms of the Sommer's scale r0 and the
experimental Bs and K masses, we get the final results for the renormalization
group invariant mass Mb = 6.88(10) GeV, translating into mb(mb) = 4.42(6) GeV
in the MSbar scheme, and fBs = 191(6) MeV for the decay constant.
  A renormalization condition for the chromo-magnetic operator, responsible, at
leading order in the heavy quark mass expansion of HQET, for the mass splitting
between the pseudoscalar and the vector channel in mesonic heavy-light bound
states, is provided in terms of lattice correlations functions which well suits
a non-perturbative computation involving a large range of renormalization
scales and no valence quarks.
  The two-loop expression of the corresponding anomalous dimension in the
Schroedinger functional (SF) scheme is computed starting from results in the
literature; it requires a one-loop calculation in the SF scheme with a
non-vanishing background field. The cutoff effects affecting the scale
evolution of the renormalization factors are studied at one-loop order, and
confirmed by non-perturbative quenched computations to be negligible for the
numerical precision achievable at present.


title: Rotating Boson Stars and Q-Balls II: Negative Parity and Ergoregions

abstract:
  We construct axially symmetric, rotating boson stars with positive and
negative parity. Their flat space limits represent spinning Q-balls. $Q$-balls
and boson stars exist only in a limited frequency range. The coupling to
gravity gives rise to a spiral-like frequency dependence of the mass and charge
of boson stars. We analyze the properties of these solutions. In particular, we
discuss the presence of ergoregions in boson stars, and determine their domains
of existence.


title:
A priori $L^{\infty}$-estimates for degenerate complex Monge-Amp\`ere
  equations

abstract:
  We study families of complex Monge-Amp\`ere equations, focusing on the case
where the cohomology classes degenerate to a non big class.
  We establish uniform a priori $L^{\infty}$-estimates for the normalized
solutions, generalizing the recent work of S. Kolodziej and G. Tian. This has
interesting consequences in the study of the K\"ahler-Ricci flow.


abstract:
  This paper has been withdrawn from the arXiv. It is now published by Elsevier
in the Journal of Statistical Planning and Inference, under the modified title
"Convergence properties of the expected improvement algorithm with fixed mean
and covariance functions". See http://dx.doi.org/10.1016/j.jspi.2010.04.018
  An author-generated post-print version is available from the HAL repository
of SUPELEC at http://hal-supelec.archives-ouvertes.fr/hal-00217562
  Abstract : "This paper deals with the convergence of the expected improvement
algorithm, a popular global optimization algorithm based on a Gaussian process
model of the function to be optimized. The first result is that under some mild
hypotheses on the covariance function k of the Gaussian process, the expected
improvement algorithm produces a dense sequence of evaluation points in the
search domain, when the function to be optimized is in the reproducing kernel
Hilbert space generated by k. The second result states that the density
property also holds for P-almost all continuous functions, where P is the
(prior) probability distribution induced by the Gaussian process."


title: On the eta(b) => J/psi J/psi decay

abstract:
  It has been argued long ago that eta(b) could be observed through the eta(b)
=> J/psi(=> mu+ mu-) J/psi(=> mu+ mu-) decay chain. Recent calculations
indicate that the width of eta(b) into two J/psi is almost three order of
magnitude smaller than the one into the D D*. We study the effects of final
state interactions due to the D D* intermediate state on the J/psi J/psi final
state. We find that the inclusion of this contribution may enhance the short
distance branching ratio of about two orders of magnitude.


title: Pricing and hedging of derivatives based on non-tradable underlyings

abstract:
  This paper is concerned with the study of insurance related derivatives on
financial markets that are based on non-tradable underlyings, but are
correlated with tradable assets. We calculate exponential utility-based
indifference prices, and corresponding derivative hedges. We use the fact that
they can be represented in terms of solutions of forward-backward stochastic
differential equations (FBSDE) with quadratic growth generators. We derive the
Markov property of such FBSDE and generalize results on the differentiability
relative to the initial value of their forward components. In this case the
optimal hedge can be represented by the price gradient multiplied with the
correlation coefficient. This way we obtain a generalization of the classical
'delta hedge' in complete markets.


title: Observational Overview of the Feeding of Active Galactic Nuclei

abstract:
  I present an overview of the observational signatures of feeding of Active
Galactic Nuclei, discussing briefly the role of interactions among galaxies on
extragalactic scales, and of non-axisymmetric gravitational potentials -- such
as bars -- on galactic scales. Then I discuss at larger length the feeding
signatures on hundred of parsec scales, for which new results include: (1)
recent star formation surrounding the active nucleus on tens of parsec scales;
(2) excess of gas and dust in active galaxies relative to non-active ones, in
the form of nuclear spirals and disks; (3) new kinematic signatures of gas
inflow along nuclear spiral arms, which may be the long sought mechanism to
bring gas from kiloparsec scales down to the nucleus to feed the supermassive
black hole.


title: Galois theory for iterative connections and nonreduced Galois groups

abstract:
  This article presents a theory of modules with iterative connection. This
theory is a generalisation of the theory of modules with connection in
characteristic zero to modules over rings of arbitrary characteristic. We show
that these modules with iterative connection (and also the modules with
integrable iterative connection) form a Tannakian category, assuming some nice
properties for the underlying ring, and we show how this generalises to modules
over schemes. We also relate these notions to stratifications on modules, as
introduced by A. Grothendieck in order to extend integrable (ordinary)
connections to finite characteristic. Over smooth rings, we obtain an
equivalence of stratifications and integrable iterative connections.
Furthermore, over a regular ring in positive characteristic, we show that the
category of modules with integrable iterative connection is also equivalent to
the category of flat bundles as defined by D. Gieseker. In the second part of
this article, we set up a Picard-Vessiot theory for fields of solutions. For
such a Picard-Vessiot extension, we obtain a Galois correspondence, which takes
into account even nonreduced closed subgroup schemes of the Galois group scheme
on one hand and inseparable intermediate extensions of the Picard-Vessiot
extension on the other hand. Finally, we compare our Galois theory with the
Galois theory for purely inseparable field extensions.


title:
Comment on "The complete Schwarzschild interior and exterior solution in
  the harmonic coordinate system" [J. Math. Phys. 39, 6086 (1998)]

abstract:
  In a recent paper Liu considered the complete Schwarzschild interior and
exterior solution in harmonic coordinates. There he argued about the necessity
to keep an integration constant, in contrast with previous treatments. The
purpose of this comment is to show that the above conclusion cannot be traced
from the matching conditions between the vacuum exterior and the uniform
density interior perfect fluid, as claimed.


title:
A Model-Independent Method of Determining Energy Scale and Muon Number
  in Cosmic Ray Surface Detectors

abstract:
  Surface detector arrays are designed to measure the spectrum and composition
of high-energy cosmic rays by detecting the secondary particle flux of the
Extensive Air Showers (EAS) induced by the primary cosmic rays. Electromagnetic
particles and muons constitute the dominant contribution to the ground detector
signals. In this paper, we show that the ground signal deposit of an EAS can be
described in terms of only very few parameters: the primary energy E, the
zenith angle theta, the distance of the shower maximum X_max to the ground, and
a muon flux normalization N_mu. This set of physical parameters is sufficient
to predict the average particle fluxes at ground level to around 10% accuracy.
We show that this is valid for hadronic air showers, using the two standard
hadronic interaction models used in cosmic ray physics, QGSJetII and Sibyll,
and for primaries from protons to iron. Based on this model, a new approach to
calibrating the energy scale of ground array experiments is developed, which
factors out the model dependence inherent in such calibrations up to now.
Additionally, the method yields a measurement of the average number of muons in
EAS. The measured distribution of N_mu of cosmic ray air showers can then be
analysed, in conjunction with measurements of X_max from fluorescence
detectors, to put constraints on the cosmic ray composition and hadronic
interaction models.


title: Constraint on rho-bar, eta-bar from B to K*pi

abstract:
  A linear CKM relation, $\bar\eta= \tan\Phi_{3/2}(\bar\rho-0.24\pm 0.03)$,
involving a $1\sigma$ range for $\Phi_{3/2}$, $20^\circ < \Phi_{3/2} <
115^\circ$, is obtained from $B^0\to K^*\pi$ amplitudes measured recently in
Dalitz plot analyses of $B^0\to K^+\pi^-\pi^0$ and $B^0(t)\to K_S\pi^+\pi^-$.
This relation is consistent within the large error on $\Phi_{3/2}$ with other
CKM constraints which are unaffected by new $b\to s\bar q q$ operators.
Sensitivity of the method to a new physics contribution in the $\Delta S=\Delta
I=1$ amplitude is discussed.


title: Generalized minimum-uncertainty squeezed states

abstract:
  Minimum-uncertainty squeezed states, related to a broad class of observables,
are analyzed. Methods for characterizing such states are developed, which are
based on numerical solutions of ordinary differential equations. As typical
examples we deal with nonlinear generalizations of quadrature squeezed states
and deformed nonlinear squeezed states. In this manner one may derive those
squeezed states which are directly related to given observables. This can be
useful for optimized measurements at a reduced level of quantum-noise.


title:
Cancer systems biology: exploring cancer-associated genes on cellular
  networks

abstract:
  Genomic alterations lead to cancer complexity and form a major hurdle for a
comprehensive understanding of the molecular mechanisms underlying oncogenesis.
In this review, we describe the recent advances in studying cancer-associated
genes from a systems biological point of view. The integration of known cancer
genes onto protein and signaling networks reveals the characteristics of cancer
genes within networks. This approach shows that cancer genes often function as
network hub proteins which are involved in many cellular processes and form
focal nodes in the information exchange between many signaling pathways.
Literature mining allows constructing gene-gene networks, in which new cancer
genes can be identified. The gene expression profiles of cancer cells are used
for reconstructing gene regulatory networks. By doing so, the genes, which are
involved in the regulation of cancer progression, can be picked up from these
networks after which their functions can be further confirmed in the
laboratory.


title: Emergence of symmetry from random n-body interactions

abstract:
  An ensemble with random n-body interactions is investigated in the presence
of symmetries. A striking emergence of regularities in spectra, ground state
spins and isospins is discovered in both odd and even-particle systems. Various
types of correlations from pairing to spectral sequences and correlations
across different masses are explored. A search for interpretation is presented.


title:
The critical line from imaginary to real baryonic chemical potentials in
  two-color QCD

abstract:
  The method of analytic continuation from imaginary to real chemical
potentials $\mu$ is one of the few available techniques to study QCD at finite
temperature and baryon density. One of its most appealing applications is the
determination of the critical line for small $\mu$: we perform a direct test of
the validity of the method in this case by studying two-color QCD, where the
sign problem is absent. The (pseudo)critical line is found to be analytic
around $\mu^2 = 0$, but a very large precision would be needed at imaginary
$\mu$ to correctly predict the location of the critical line at real $\mu$.


title: Dark energy due to effective quantum field theory

abstract:
  In the cosmological context an effective quantum field theory describing the
behavior of visible matter in the universe is characterized with its inherent
UV cutoff and also with an IR scale that is set by the cosmological (particle)
horizon. This UV - IR relation naturally defines a space-time grid over a
horizon scale. Using the approach for determining of dark energy through the
space-time uncertainty relation versus such a space-time grid, we estimate the
energy density and pressure of a dark energy defined by this UV - IR relation.
Such a dark energy shows up to decay linearly with time and exhibits a negative
pressure only recently.


title: $m$-Sequences of Different Lengths with Four-Valued Cross Correlation

abstract:
  {\bf Abstract.} Considered is the distribution of the cross correlation
between $m$-sequences of length $2^m-1$, where $m$ is even, and $m$-sequences
of shorter length $2^{m/2}-1$. The infinite family of pairs of $m$-sequences
with four-valued cross correlation is constructed and the complete correlation
distribution of this family is determined.


title:
On the validity of the 5-dimensional Birkhoff theorem: The tale of an
  exceptional case

abstract:
  The 5-dimensional (5d) Birkhoff theorem gives the class of 5d vacuum
space-times containing spatial hypersurfaces with cosmological symmetries. This
theorem is violated by the 5d vacuum Gergely-Maartens (GM) space-time, which is
not a representant of the above class, but contains the static Einstein brane
as embedded hypersurface. We prove that the 5d Birkhoff theorem is still
satisfied in a weaker sense: the GM space-time is related to the degenerated
horizon metric of certain black-hole space-times of the allowed class. This
result resembles the connection between the Bertotti-Robinson space-time and
the horizon region of the extremal Reissner-Nordstrom space-time in general
relativity.


title:
Third Family Corrections to Quark and Lepton Mixing in SUSY Models with
  non-Abelian Family Symmetry

abstract:
  We re-analyse the effect of corrections from canonical normalisation of
kinetic terms on the quark and lepton mixing angles. This type of corrections
emerges, for example, from effective higher-dimensional Kahler potential
operators in the context of locally supersymmetric models of flavour. In
contrast to previous studies we find that the necessary procedure of redefining
the fields in order to restore canonically normalised kinetic terms, i.e.
canonical normalisation, can lead to significant corrections to the fermion
mixing angles (as determined from the superpotential). Such potentially large
effects are characteristic of flavour models based on non-Abelian family
symmetries, where some of the possible Kahler potential (and superpotential)
operators, in particular those associated with the third family, are only
mildly suppressed. We investigate under which conditions the messenger sector
of such flavour models generates such Kahler potential operators for which the
canonical normalisation effects are sizeable, and under which conditions these
operators may be absent and canonical normalisation effects are small. As
explicit examples for potentially relevant CN effects, we will discuss the
corrections to the CKM matrix element |V_{cb}| as well as corrections to
tri-bimaximal neutrino mixing.


title: Homolumo Gap and Matrix Model

abstract:
  We discuss a dynamical matrix model by which probability distribution is
associated with Gaussian ensembles from random matrix theory. We interpret the
matrix M as a Hamiltonian representing interaction of a bosonic system with a
single fermion. We show that a system of second-quantized fermions influences
the ground state of the whole system by producing a gap between the highest
occupied eigenvalue and the lowest unoccupied eigenvalue.


title: A journey across the M33 disk

abstract:
  The Local Group member M33 is a pure disk galaxy bearing no prominent bulge
or stellar halo. It constitutes a challenge for any hierarchical galaxy
formation theory and an ideal laboratory for studying quiescent star formation.
Using multiwavelength observations of the gas and stellar component in this
nearby galaxy we are able to constrain the gas accretion and star formation
history. In the centermost region we find kinematical evidence of a weak bar,
which explains the central light excess and the enhanced metallicity. In the
more extended disk the lack of strong gradients of metal and dust abundances
supports the picture that the slow radial decline of the star formation rate is
due to a change in the large scale disk perturbations: bright HII regions and
giant molecular clouds being born only in the inner disk. The analysis of the
infrared Spitzer maps has however revealed hundreds of low luminosity star
forming sites in places with a variety of dust content. These are essential
ingredients for understanding the overall gas to star formation process in M33
and in more distant late type galaxies.


title: Covering link calculus and iterated Bing doubles

abstract:
  We give a new geometric obstruction to the iterated Bing double of a knot
being a slice link: for n>1 the (n+1)-st iterated Bing double of a knot is
rationally slice if and only if the n-th iterated Bing double of the knot is
rationally slice. The main technique of the proof is a covering link
construction simplifying a given link. We prove certain similar geometric
obstructions for n <= 1 as well. Our results are sharp enough to conclude, when
combined with algebraic invariants, that if the n-th iterated Bing double of a
knot is slice for some n, then the knot is algebraically slice. Also our
geometric arguments applied to the smooth case show that the Ozsvath-Szabo and
Manolescu-Owens invariants give obstructions to iterated Bing doubles being
slice. These results generalize recent results of Harvey, Teichner, Cimasoni,
Cha and Cha-Livingston-Ruberman. As another application, we give explicit
examples of algebraically slice knots with non-slice iterated Bing doubles by
considering von Neumann rho-invariants and rational knot concordance. Refined
versions of such examples are given, that take into account the
Cochran-Orr-Teichner filtration.


title: Cubature on Wiener space in infinite dimension

abstract:
  We prove a stochastic Taylor expansion for SPDEs and apply this result to
obtain cubature methods, i. e. high order weak approximation schemes for SPDEs,
in the spirit of T. Lyons and N. Victoir. We can prove a high-order weak
convergence for well-defined classes of test functions if the process starts at
sufficiently regular initial values. We can also derive analogous results in
the presence of L\'evy processes of finite type, here the results seem to be
new even in finite dimension. Several numerical examples are added.


title: Vanishing of trace forms in low characteristics

abstract:
  Every finite-dimensional representation of an algebraic group G gives a trace
symmetric bilinear form on the Lie algebra of G. We give criteria in terms of
root system data for the existence of a representation such that this form is
nonzero or nondegenerate. As a corollary, we show that a Lie algebra of type E8
over a field of characteristic 5 does not have a so-called "quotient trace
form", answering a question posed in the 1960s.


title: Thermodynamics of antiferromagnetic alternating spin chains

abstract:
  We consider integrable quantum spin chains with alternating spins (S_1,S_2).
We derive a finite set of non-linear integral equations for the thermodynamics
of these models by use of the quantum transfer matrix approach. Numerical
solutions of the integral equations are provided for quantities like specific
heat, magnetic susceptibility and in the case S_1=S_2 for the thermal Drude
weight. At low temperatures one class of models shows finite magnetization and
the other class presents antiferromagnetic behaviour. The thermal Drude weight
behaves linearly on T at low temperatures and is proportional to the central
charge c of the system. Quite generally, we observe residual entropy for
S_1\neq S_2.


title:
Convergent and conservative schemes for nonclassical solutions based on
  kinetic relations

abstract:
  We propose a new numerical approach to compute nonclassical solutions to
hyperbolic conservation laws. The class of finite difference schemes presented
here is fully conservative and keep nonclassical shock waves as sharp
interfaces, contrary to standard finite difference schemes. The main challenge
is to achieve, at the discretization level, a consistency property with respect
to a prescribed kinetic relation. The latter is required for the selection of
physically meaningful nonclassical shocks. Our method is based on a
reconstruction technique performed in each computational cell that may contain
a nonclassical shock. To validate this approach, we establish several
consistency and stability properties, and we perform careful numerical
experiments. The convergence of the algorithm toward the physically meaningful
solutions selected by a kinetic relation is demonstrated numerically for
several test cases, including concave-convex as well as convex-concave
flux-functions.


title:
Spin-orbit interaction and anomalous spin relaxation in carbon nanotube
  quantum dots

abstract:
  We study spin relaxation and decoherence caused by electron-lattice and
spin-orbit interaction and predict striking effects induced by magnetic fields
$B$. For particular values of $B$, destructive interference occurs resulting in
ultralong spin relaxation times $T_1$ exceeding tens of seconds. For small
phonon frequencies $\omega$, we find a $1/\sqrt{\omega}$ spin-phonon noise
spectrum -- a novel dissipation channel for spins in quantum dots -- which can
reduce $T_1$ by many orders of magnitude. We show that nanotubes exhibit
zero-field level splitting caused by spin-orbit interaction. This enables an
all-electrical and phase-coherent control of spin.


title: Emergence of Thermodynamics from Darwinian Dynamics

abstract:
  Darwinian dynamics is manifestly stochastic and nonconservative, but has a
profound connection to conservative dynamics in physics. In the present paper
the main ideas and logical steps leading to thermodynamics from Darwinian
dynamics are discussed in a quantitative manner. A synthesis between
nonequilibrum dynamics and conservative dynamics is outlined.


title:
Zeeman-Doppler Imaging of Late-Type Stars -- The Surface Magnetic Field
  of II Peg

abstract:
  Late-type stars in general possess complicated magnetic surface fields which
makes their detection and in particular their modeling and reconstruction
challenging. In this work we present a new Zeeman-Doppler imaging code which is
especially designed for the application to late-type stars. This code uses a
new multi-line cross-correlation technique by means of a principal component
analysis to extract and enhance the quality of individual polarized line
profiles. It implements the full polarized radiative transfer equation and uses
an inversion strategy that can incorporate prior knowledge based on solar
analogies. Moreover, our code utilizes a new regularization scheme which is
based on local maximum entropy to allow a more appropriate reproduction of
complex surface fields as those expected for late-type stars. In a first
application we present Zeeman-Doppler images of II Pegasi which reveal a
surprisingly large scale surface structure with one predominant (unipolar)
magnetic longitude which is mainly radially oriented.


title: Transmission of Information in Active Networks

abstract:
  Shannon's Capacity Theorem is the main concept behind the Theory of
Communication. It says that if the amount of information contained in a signal
is smaller than the channel capacity of a physical media of communication, it
can be transmitted with arbitrarily small probability of error. This theorem is
usually applicable to ideal channels of communication in which the information
to be transmitted does not alter the passive characteristics of the channel
that basically tries to reproduce the source of information. For an {\it active
channel}, a network formed by elements that are dynamical systems (such as
neurons, chaotic or periodic oscillators), it is unclear if such theorem is
applicable, once an active channel can adapt to the input of a signal, altering
its capacity. To shed light into this matter, we show, among other results, how
to calculate the information capacity of an active channel of communication.
Then, we show that the {\it channel capacity} depends on whether the active
channel is self-excitable or not and that, contrary to a current belief,
desynchronization can provide an environment in which large amounts of
information can be transmitted in a channel that is self-excitable. An
interesting case of a self-excitable active channel is a network of
electrically connected Hindmarsh-Rose chaotic neurons.


title:
Modulation of surface plasmon coupling-in by one-dimensional surface
  corrugation

abstract:
  Surface plasmon-polaritons have recently attracted renewed interest in the
scientific community for their potential in sub-wavelength optics, light
generation and non-destructive sensing. Given that they cannot be directly
excited by freely propagating light due to their intrinsical binding to the
metal surface, the light-plasmon coupling efficiency becomes of crucial
importance for the success of any plasmonic device. Here we present a
comprehensive study on the modulation (enhancement or suppression) of such
coupling efficiency by means of one-dimensional surface corrugation. Our
approach is based on simple wave interference and enables us to make
quantitative predictions which have been experimentally confirmed at both the
near infra-red and telecom ranges.


title: The operator product expansion on the lattice

abstract:
  We investigate the Operator Product Expansion (OPE) on the lattice by
directly measuring the product <Jmu Jnu> (where J is the vector current) and
comparing it with the expectation values of bilinear operators. This will
determine the Wilson coefficients in the OPE from lattice data, and so give an
alternative to the conventional methods of renormalising lattice structure
function calculations. It could also give us access to higher twist quantities
such as the longitudinal structure function F_L = F_2 - 2 x F_1. We use overlap
fermions because of their improved chiral properties, which reduces the number
of possible operator mixing coefficients.


title:
Kinetic Monte Carlo Method for Rule-based Modeling of Biochemical
  Networks

abstract:
  We present a kinetic Monte Carlo method for simulating chemical
transformations specified by reaction rules, which can be viewed as generators
of chemical reactions, or equivalently, definitions of reaction classes. A rule
identifies the molecular components involved in a transformation, how these
components change, conditions that affect whether a transformation occurs, and
a rate law. The computational cost of the method, unlike conventional
simulation approaches, is independent of the number of possible reactions,
which need not be specified in advance or explicitly generated in a simulation.
To demonstrate the method, we apply it to study the kinetics of multivalent
ligand-receptor interactions. We expect the method will be useful for studying
cellular signaling systems and other physical systems involving aggregation
phenomena.


title:
The minimum entropy principle for fluid flows in a nozzle with
  discontinuous cross-section

abstract:
  We consider the Euler equations for compressible fluids in a nozzle whose
cross-section is variable and may contain discontinuities. We view these
equations as a hyperbolic system in nonconservative form and investigate weak
solutions in the sense of Dal Maso, LeFloch, and Murat. Observing that the
entropy equality has a fully conservative form, we derive a minimum entropy
principle satisfied by entropy solutions. We then establish the stability of a
class of numerical approximations for this system.


title: Liouville gravity from Einstein gravity

abstract:
  We show that Liouville gravity arises as the limit of pure Einstein gravity
in 2+epsilon dimensions as epsilon goes to zero, provided Newton's constant
scales with epsilon. Our procedure - spherical reduction, dualization, limit,
dualizing back - passes several consistency tests: geometric properties,
interactions with matter and the Bekenstein-Hawking entropy are as expected
from Einstein gravity.


title:
Controlling the Emission of Electromagnetic Sources by Coordinate
  transformation

abstract:
  The coordinate transformation on the space that contains electromagnetic
sources is studied. We find that, not only the permittivity and permeability
tensors of the media, but also the sources inside the media will take another
form in order to behave equivalently as the original case. It is demonstrated
that, a source of arbitrary shape and position in the free space can be
replaced by an appropriately designed metamaterial coating with current
distributed on the inner surface and would not be detected by outer observers,
because the emission of the source can be controlled at will in this way. As
examples, we show how to design conformal antennas by covering the sources with
transformation media. The method proposed in this letter provides a completely
new approach to develop novel active EM devices.


title: Convex Hulls of Orbits and Orientations of a Moving Protein Domain

abstract:
  We study the facial structure and Carath\'eodory number of the convex hull of
an orbit of the group of rotations in R^3 acting on the space of pairs of
anisotropic symmetric 3\times 3 tensors. This is motivated by the problem of
determining the structure of some proteins in aqueous solution.


title:
The Riemann problem for the shallow water equations with discontinuous
  topography

abstract:
  We construct the solution of the Riemann problem for the shallow water
equations with discontinuous topography. The system under consideration is
non-strictly hyperbolic and does not admit a fully conservative form, and we
establish the existence of two-parameter wave sets, rather than wave curves.
The selection of admissible waves is particularly challenging. Our construction
is fully explicit, and leads to formulas that can be implemented numerically
for the approximation of the general initial-value problem.


title:
Non-Gaussian Density Fluctuations from Entropically Generated Curvature
  Perturbations in Ekpyrotic Models

abstract:
  We analyze the non-gaussian density perturbations generated in
ekpyrotic/cyclic models based on heterotic M-theory. In this picture, two
scalar fields produce nearly scale-invariant entropic perturbations during an
ekpyrotic phase that are converted into curvature modes {\it after the
ekpyrotic phase is complete} and just before the big bang. Both intrinsic
non-linearity in the entropy perturbation and the conversion process contribute
to non-gaussianity. The range of the non-gaussianity parameter $f_{NL}$ depends
on how gradual the conversion process is and the steepness of the scalar field
potential during the ekpyrotic phase. Although a wider range is possible, in
principle, natural values of the ekpyrotic parameters combined with a gradual
conversion process lead to values of $-60 \lesssim f_{NL} \lesssim +80$,
typically much greater than slow-roll inflation but within the current
observational bounds.


title:
The formation of labyrinths, spots and stripe patterns in a biochemical
  approach to cardiovascular calcification

abstract:
  Calcification and mineralization are fundamental physiological processes, yet
the mechanisms of calcification, in trabecular bone and in calcified lesions in
atherosclerotic calcification, are unclear. Recently, it was shown in in vitro
experiments that vascular-derived mesenchymal stem cells can display
self-organized calcified patterns. These patterns were attributed to
activator/inhibitor dynamics in the style of Turing, with bone morphogenetic
protein 2 acting as an activator, and matrix GLA protein acting as an
inhibitor. Motivated by this qualitative activator-inhibitor dynamics, we
employ a prototype Gierer-Meinhardt model used in the context of
activator-inhibitor based biological pattern formation. Through a detailed
analysis in one and two spatial dimensions, we explore the pattern formation
mechanisms of steady state patterns, including their dependence on initial
conditions. These patterns range from localized holes to labyrinths and
localized peaks, or in other words, from dense to sparse activator
distributions (respectively). We believe that an understanding of the wide
spectrum of activator-inhibitor patterns discussed here is prerequisite to
their biochemical control. The mechanisms of pattern formation suggest
therapeutic strategies applicable to bone formation in atherosclerotic lesions
in arteries (where it is pathological) and to the regeneration of trabecular
bone (recapitulating normal physiological development).


title:
Event-by-event simulation of quantum phenomena: Application to
  Einstein-Podolosky-Rosen-Bohm experiments

abstract:
  We review the data gathering and analysis procedure used in real
Einstein-Podolsky-Rosen-Bohm experiments with photons and we illustrate the
procedure by analyzing experimental data. Based on this analysis, we construct
event-based computer simulation models in which every essential element in the
experiment has a counterpart. The data is analyzed by counting single-particle
events and two-particle coincidences, using the same procedure as in
experiments. The simulation models strictly satisfy Einstein's criteria of
local causality, do not rely on any concept of quantum theory or probability
theory, and reproduce all results of quantum theory for a quantum system of two
$S=1/2$ particles. We present a rigorous analytical treatment of these models
and show that they may yield results that are in exact agreement with quantum
theory. The apparent conflict with the folklore on Bell's theorem, stating that
such models are not supposed to exist, is resolved. Finally, starting from the
principles of probable inference, we derive the probability distributions of
quantum theory of the Einstein-Podolsky-Rosen-Bohm experiment without invoking
concepts of quantum theory.


title: CKM-suppressed top quark decays t -> q + W in the SM and beyond

abstract:
  Top quark decays are of particular interest as a mean to test the standard
model (SM) predictions, both for dominant (t -> b + W) and rare decays (t -> q
+ W, cV, cVV, c phi^{0}, bWZ). As the latter are highly suppressed, they become
an excellent window to probe the predictions of thories beyond the SM. In
particular, we evaluate the corrections from new physics to the CKM-suppressed
SM top quark decay t -> q + W (q = d, s), both within the an effective model
with right-handed currents and the MSSM. We also discuss the perspectives to
probe those predictions at the ILC.


title: Benchmarks for new strong interactions at the LHC

abstract:
  New strong interactions at the LHC may exhibit a richer structure than
expected from simply rescaling QCD to the electroweak scale. In fact, a
departure from rescaled QCD is required for compatibility with electroweak
constraints. To navigate the space of possible scenarios, we use a simple
framework, based on a 5D model with modifications of AdS geometry in the
infrared. In the parameter space, we select two points with particularly
interesting phenomenology. For these benchmark points, we explore the discovery
of triplets of vector and axial resonances at the LHC.


title:
The conjecture H: A lower bound of cohomologic dimension for an elliptic
  space

abstract:
  The goal of this paper is to ameliorate the sufficients conditions, already
established by the first author so that the sum of the numbers of Betti, of
1-connected rational finite CW-complex, is higher than the dimension of his
$\mathbb Q$-vectorial space of homotopy, we will present it in two aspects, one
algebraic and another geometrical.


title: Spectral Function for the S=1 Heisenberg Antiferromagetic Chain

abstract:
  We study the spectral function, $S(k,\omega)$ for the spin-1, one dimensional
antiferromagnetic chain using a time-dependent density matrix renormalizaton
group (DMRG) numerical method. We develop methods for extrapolating the time
dependent correlation functions to larger times in order to enhance the
frequency resolution. The resulting spectral functions are impressively precise
and accurate. Our results confirm many qualitative expectations from non-linear
$\sigma$ model methods and test them quantitatively. The critical wave-vector
at which the single particle excitation emerges from the 2-particle continuum
is estimated to be $0.23\pi-0.24\pi$.


title: Controlling Viral Capsid Assembly with Templating

abstract:
  We develop coarse-grained models that describe the dynamic encapsidation of
functionalized nanoparticles by viral capsid proteins. We find that some forms
of cooperative interactions between protein subunits and nanoparticles can
dramatically enhance rates and robustness of assembly, as compared to the
spontaneous assembly of subunits into empty capsids. For large core-subunit
interactions, subunits adsorb onto core surfaces en masse in a disordered
manner, and then undergo a cooperative rearrangement into an ordered capsid
structure. These assembly pathways are unlike any identified for empty capsid
formation. Our models can be directly applied to recent experiments in which
viral capsid proteins assemble around the functionalized inorganic
nanoparticles [Sun et al., Proc. Natl. Acad. Sci (2007) 104, 1354]. In
addition, we discuss broader implications for understanding the dynamic
encapsidation of single-stranded genomic molecules during viral replication and
for developing multicomponent nanostructured materials.


title:
Comparison between numerical-relativity and post-Newtonian waveforms
  from spinning binaries: the orbital hang-up case

abstract:
  We compare results from numerical simulations of spinning binaries in the
"orbital hangup" case, where the binary completes at least nine orbits before
merger, with post-Newtonian results using the approximants TaylorT1, T4 and Et.
We find that, over the ten cycles before the gravitational-wave frequency
reaches $M\omega = 0.1$, the accumulated phase disagreement between NR and
2.5PN results is less than three radians, and is less than 2.5 radians when
using 3.5PN results. The amplitude disagreement between NR and restricted PN
results increases with the black holes' spin, from about 6% in the equal-mass
case to 12% when the black holes' spins are $S_i/M_i^2 = 0.85$. Finally, our
results suggest that the merger waveform will play an important role in
estimating the spin from such inspiral waveforms.


title: Evolution equation for a model of surface relaxation in complex networks

abstract:
  In this paper we derive analytically the evolution equation of the interface
for a model of surface growth with relaxation to the minimum (SRM) in complex
networks. We were inspired by the disagreement between the scaling results of
the steady state of the fluctuations between the discrete SRM model and the
Edward-Wilkinson process found in scale-free networks with degree distribution
$ P(k) \sim k^{-\lambda}$ for $\lambda <3$ [Pastore y Piontti {\it et al.},
Phys. Rev. E {\bf 76}, 046117 (2007)]. Even though for Euclidean lattices the
evolution equation is linear, we find that in complex heterogeneous networks
non-linear terms appear due to the heterogeneity and the lack of symmetry of
the network; they produce a logarithmic divergency of the saturation roughness
with the system size as found by Pastore y Piontti {\it et al.} for $\lambda
<3$.


title:
Measurement of the B0_s semileptonic branching ratio to an orbitally
  excited D_s** state, Br(B0_s -> Ds1(2536) mu nu)

abstract:
  In a data sample of approximately 1.3 fb-1 collected with the D0 detector
between 2002 and 2006, the orbitally excited charm state D_s1(2536) has been
observed with a measured mass of 2535.7 +/- 0.6 (stat) +/- 0.5 (syst) MeV via
the decay mode B0_s -> D_s1(2536) mu nu X. A first measurement is made of the
branching ratio product Br(b(bar) -> D_s1(2536) mu nu X).Br(D_s1(2536)->D*
K0_S). Assuming that D_s1(2536) production in semileptonic decay is entirely
from B0_s, an extraction of the semileptonic branching ratio Br(B0_s ->
D_s1(2536) mu nu X) is made.


title:
Front motion and localized states in an asymmetric bistable
  activator-inhibitor system with saturation

abstract:
  We study the spatiotemporal properties of coherent states (peaks, holes, and
fronts) in a bistable activator-inhibitor system that exhibits biochemical
saturated autocatalysis, and in which fronts do not preserve spatial parity
symmetry. Using the Gierer-Meinhardt prototype model, we find the conditions in
which two distinct pinning regions are formed. The first pinning type is known
in the context of variational systems while the second is structurally
different due to the presence of a heteroclinic bifurcation between two uniform
states. The bifurcation also separates the parameter regions of
counterpropagating fronts, leading in turn to the growth or contraction of
activator domains. These phenomena expand the range of pattern formation theory
and its biomedical applications: activator domain retraction suggests potential
therapeutic strategies for patterned pathologies, such as cardiovascular
calcification.


title: Dynamics of gene expression and the regulatory inference problem

abstract:
  From the response to external stimuli to cell division and death, the
dynamics of living cells is based on the expression of specific genes at
specific times. The decision when to express a gene is implemented by the
binding and unbinding of transcription factor molecules to regulatory DNA.
Here, we construct stochastic models of gene expression dynamics and test them
on experimental time-series data of messenger-RNA concentrations. The models
are used to infer biophysical parameters of gene transcription, including the
statistics of transcription factor-DNA binding and the target genes controlled
by a given transcription factor.


title: Nuclear spin relaxation induced by a mechanical resonator

abstract:
  We report on measurements of the spin lifetime of nuclear spins strongly
coupled to a micromechanical cantilever as used in magnetic resonance force
microscopy. We find that the rotating-frame correlation time of the statistical
nuclear polarization is set by the magneto-mechanical noise originating from
the thermal motion of the cantilever. Evidence is based on the effect of three
parameters: (1) the magnetic field gradient (the coupling strength), (2) the
Rabi frequency of the spins (the transition energy), and (3) the temperature of
the low-frequency mechanical modes. Experimental results are compared to
relaxation rates calculated from the spectral density of the magneto-mechanical
noise.


title: On the Relationship between Thermodynamics and Special Relativity

abstract:
  Starting from a formulation for the $dS$ element that includes movement, and
considering the variation of the entropy Lorentz invariant, we found the
relativistic transformations for thermodynamic systems that satisfy the three
laws of thermodynamics. Particularly, we found the temperature and pressure
transformations, given by $T'=\gamma T$ and $p'=\gamma^2p$ respectively.
Furthermore, we show that this transformations keeps the form of the state
equation for an ideal gas in agreement with the relativity principle.


title: Simple algebras of Gelfand-Kirillov dimension two

abstract:
  Let $k$ be a field. We show that a finitely generated simple Goldie
$k$-algebra of quadratic growth is noetherian and has Krull dimension 1. Thus a
simple algebra of quadratic growth is left noetherian if and only if it is
right noetherian. As a special case, we see that if A is a finitely generated
simple domain of quadratic growth then A is noetherian and by a result of
Stafford every right and left ideal is generated by at most two elements. We
conclude by posing questions and giving examples in which we consider what
happens when the hypotheses are relaxed.


title: The Sunyaev-Zel'dovich Effect On Elliptical Galaxies

abstract:
  The history of discovering of hot gas in galaxies is traced briefly, its main
properties are described and the desirability to make them more precise, in
particular to obtain additional data on the mass of such gas is pointed out.
For this purpose observations of the Sunyaev-Zel'dovich effect on hot gas of
coronas of elliptic galaxies are proposed. The absolute and relative
disturbances of the cosmic microwave radiation spectrum due to scattering of
relic photons by Maxwellian electrons are calculated according the formula of
the article. With the example of three elliptic galaxies it is shown that
observation of the SZ effect on such galaxies is quite possible. Kinematic SZ
effect arising due to peculiar movement and rotation of galaxies is available
for observation as well. Such observations combined with X-ray data would make
it possible to get more about properties of galactic gas, to obtain additional
information on rotation of galaxies, on possible accreting gas flows and on hot
galactic wind.


title:
Criteria for mixing rules application for inhomogeneous astrophysical
  grains

abstract:
  The analysis presented in this paper verifies which of the mixing rules are
best for real components of interstellar dust in possible wide range of
wavelengths.The DDA method with elements of different components with various
volume fractions has been used. We have considered 6 materials: ice, amorphous
carbon, graphite, SiC, silicates and iron, and the following mixing rules:
Maxwell-Garnett, Bruggeman, Looyenga, Hanay and Lichtenecker which must satisfy
rigorous bounds. The porous materials have also been considered. We have
assumed simplified spatial distribution, shape and size of inclusions. The
criteria given by \citet{draine1988} have been used to determine the range of
wavelengths for the considered mixtures in order to calculate the ${\rm
Q_{ext}}$ using the DDA. From all chosen mixing rules for the examined
materials in majority of cases (13 out of 20) the best results have been
obtained using the Lichtenecker mixing rule. In 5 cases this rule is better for
some volume fraction of inclusions.


title: Variable stars across the observational HR diagram

abstract:
  An overview of pulsating variable stars across the observational
Hertzprung-Russel (HR) diagram is presented, together with a summary of their
global properties. The HR diagram is presented with a third colour-coded
dimension, visualizing the fraction of variable, the amplitude of variability
or the period of variability. The distribution of variable stars in the other
observational diagrams, such as the Period-Amplitude diagram, is also
presented. Some of the progresses performed in the field of variable stars
during the last decade are briefly summarized, and future projects that will
improve our knowledge of variable stars are mentioned.


title: Collective three-flavor oscillations of supernova neutrinos

abstract:
  Neutrinos and antineutrinos emitted from a core collapse supernova interact
among themselves, giving rise to collective flavor conversion effects that are
significant near the neutrinosphere. We develop a formalism to analyze these
collective effects in the complete three-flavor framework. It naturally
generalizes the spin-precession analogy to three flavors and is capable of
analytically describing phenomena like vacuum/MSW oscillations, synchronized
oscillations, bipolar oscillations and spectral split. Using the formalism, we
demonstrate that the flavor conversions may be "factorized" into two-flavor
oscillations with hierarchical frequencies. We explicitly show how the
three-flavor solution may be constructed by combining two-flavor solutions. For
a typical supernova density profile, we identify an approximate separation of
regions where distinctly different flavor conversion mechanisms operate, and
demonstrate the interplay between collective and MSW effects. We pictorialize
our results in terms of the "e_3 - e_8 triangle" diagram, which is a tool that
can be used to visualize three-neutrino flavor conversions in general, and
offers insights into the analysis of the collective effects in particular.


title:
Time-symmetric initial data of large brane-localized black hole in RS-II
  model

abstract:
  In the aim of shedding a new light on the classical black hole evaporation
conjecture stating that a static brane-localized black hole (BH) larger than
the bulk curvature scale does not exist in Randall-Sundrum II (RS-II) model, we
investigate time-symmetric initial data with a brane-localized apparent horizon
(AH) and analyzed its properties. We find that a three-parameter family of such
initial data can be constructed by simply placing a brane on a constant time
surface of Schwarzschild anti-de Sitter space. By this method, we unambiguously
confirm that initial data with an arbitrarily large AH area do exist. We
compare the ADM mass and the horizon area of our initial data with that of the
black string (BS) solution, and find that any initial data constructed by this
method do not have a smaller mass than the BS solution when the horizon area is
larger than the size determined by the bulk curvature scale. We further
investigate what kind of configuration realizes the minimum mass for the same
AH area. The configuration that realizes the smallest mass turns out to be the
one close to the BS truncated by a cap. We also demonstrate that the same
method applies to construct initial data in (3+1)-dimensional RS-II brane
world. In this case an exact solution of a brane-localized BH exists but BS
solution does not. Nevertheless, the behavior of the initial data is quite
similar in both cases. We find that the known exact solution always has a
smaller mass than our initial data with the same horizon area. This result
enforces the standard belief that the exact BH solution is the most stable
black object in the four-dimensional RS-II model. These results are all
consistent with the classical BH evaporation conjecture, but unfortunately it
turns out that they do not provide a strong support of it.


title: Merger history trees of dark matter haloes in moving barrier models

abstract:
  We present an algorithm for generating merger histories of dark matter
haloes. The algorithm is based on the excursion set approach with moving
barriers whose shape is motivated by the ellipsoidal collapse model of halo
formation. In contrast to most other merger-tree algorithms, ours takes
discrete steps in mass rather than time. This allows us to quantify effects
which arise from the fact that outputs from numerical simulations are usually
in discrete time bins. In addition, it suggests a natural set of scaling
variables for describing the abundance of halo progenitors; this scaling is not
as general as that associated with a spherical collapse. We test our algorithm
by comparing its predictions with measurements in numerical simulations. The
progenitor mass fractions and mass functions are in good agreement, as is the
predicted scaling law. We also test the formation-redshift distribution, the
mass distribution at formation, and the redshift distribution of the most
recent major merger; all are in reasonable agreement with N-body simulation
data, over a broad range of masses and redshifts. Finally, we study the effects
of sampling in discrete time snapshots. In all cases, the improvement over
algorithms based on the spherical collapse assumption is significant.


title: A Counterexample to a conjecture of Bosio and Meersseman

abstract:
  In a paper of Bosio and Meersseman (Real quadrics in Cn, complex manifolds
and convex polytopes) the following is conjectured: If P is dual neighborly,
then Zp is diffeomorphic to the connected sum of products of spheres. In this
paper a counterexample is provided.


title: Hyperbolic billiards with nearly flat focusing boundaries. I

abstract:
  The standard Wojtkowski-Markarian-Donnay-Bunimovich technique for the
hyperbolicity of focusing or mixed billiards in the plane requires the diameter
of a billiard table to be of the same order as the largest ray of curvature
along the focusing boundary. This is due to the physical principle that is used
in the proofs, the so-called defocusing mechanism of geometrical optics. In
this paper we construct examples of hyperbolic billiards with a focusing
boundary component of arbitrarily small curvature whose diameter is bounded by
a constant independent of that curvature. Our proof employs a nonstardard cone
bundle that does not solely use the familiar dispersing and defocusing
mechanisms.


title:
Vibronic polarons: comments on a model for the colossal field-resistance
  effects in manganites

abstract:
  In addition to mechanisms already proposed to account for the formation in
manganites of a small-polaron superlattice above the Curie temperature Tc and
to a metallic-like sea of large polarons below Tc, we now consider other
observed colossal-resistance inducing fields, such as magnetic, electric,
photon, or strain fields. We attribute the charge-ordered phase formation to
the occurrence of strong dipolar binding of vibronic small polarons arising
from the phonon coupling of highly polarizable two-level orbital systems. These
species having associated inherent electric and magnetic off-center dipoles,
they couple to the external fields leading to the observed colossal effects.
The random phase appears due to polaron band widening in the external field.


title: Modeling Ultraviolet Wind Line Variability in Massive Hot Stars

abstract:
  We model the detailed time-evolution of Discrete Absorption Components (DACs)
observed in P Cygni profiles of the Si IV lam1400 resonance doublet lines of
the fast-rotating supergiant HD 64760 (B0.5 Ib). We adopt the common assumption
that the DACs are caused by Co-rotating Interaction Regions (CIRs) in the
stellar wind. We perform 3D radiative transfer calculations with hydrodynamic
models of the stellar wind that incorporate these large-scale density- and
velocity-structures. We develop the 3D transfer code Wind3D to investigate the
physical properties of CIRs with detailed fits to the DAC shape and morphology.
The CIRs are caused by irregularities on the stellar surface that change the
radiative force in the stellar wind. In our hydrodynamic model we approximate
these irregularities by circular symmetric spots on the stellar surface. We use
the Zeus3D code to model the stellar wind and the CIRs, limited to the
equatorial plane. We constrain the properties of large-scale wind structures
with detailed fits to DACs observed in HD 64760. A model with two spots of
unequal brightness and size on opposite sides of the equator, with opening
angles of 20 +/- 5 degr and 30 +/- 5 degr diameter, and that are 20 +/- 5 % and
8 +/- 5 % brighter than the stellar surface, respectively, provides the best
fit to the observed DACs. The recurrence time of the DACs compared to the
estimated rotational period corresponds to spot velocities that are 5 times
slower than the rotational velocity. The mass-loss rate of the structured wind
model for HD 64760 does not exceed the rate of the spherically symmetric smooth
wind model by more than 1 %. The fact that DACs are observed in a large number
of hot stars constrains the clumping that can be present in their winds, as
substantial amounts of clumping would tend to destroy the CIRs.


title:
Search for squarks and gluinos in events with jets and missing
  transverse energy using 2.1 fb-1 of ppbar collision data at sqrt(s)=1.96 TeV

abstract:
  A data sample corresponding to an integrated luminosity of 2.1 fb-1 collected
by the D0 detector at the Fermilab Tevatron Collider was analyzed to search for
squarks and gluinos produced in ppbar collisions at a center-of-mass energy of
1.96 TeV. No evidence for the production of such particles was observed in
topologies involving jets and missing transverse energy, and 95% C.L. lower
limits of 379 GeV and 308 GeV were set on the squark and gluino masses,
respectively, within the framework of minimal supergravity with tan(beta)=3,
A0=0, and mu<0. The corresponding previous limits are improved by 54 GeV and 67
GeV.


title:
Holographic Dark Energy in Braneworld Models with a Gauss-Bonnet Term in
  the Bulk. Interacting Behavior and the w =-1 Crossing

abstract:
  We apply bulk holographic dark energy in general braneworld models with a
Gauss-Bonnet term in the bulk and an induced gravity term and a perfect fluid
on the brane. Without making any additional assumptions we extract the
Friedmann equation on the physical brane and we show that a
$\rho$-$\rho_\Lambda$ coupling arises naturally by the full 5D dynamics. The
low-energy (late-time) evolution reveals that the effective 4D holographic dark
energy behaves as ``quintom'', that is it crosses the phantom divide $w=-1$
during the evolution. In particular, the Gauss-Bonnet contribution decreases
the present value of $w_\Lambda$, while it increases the growing rate of
$w_\Lambda(z)$ with $z$, in comparison with the case where such a term is
absent.


title:
Improved Collaborative Filtering Algorithm via Information
  Transformation

abstract:
  In this paper, we propose a spreading activation approach for collaborative
filtering (SA-CF). By using the opinion spreading process, the similarity
between any users can be obtained. The algorithm has remarkably higher accuracy
than the standard collaborative filtering (CF) using Pearson correlation.
Furthermore, we introduce a free parameter $\beta$ to regulate the
contributions of objects to user-user correlations. The numerical results
indicate that decreasing the influence of popular objects can further improve
the algorithmic accuracy and personality. We argue that a better algorithm
should simultaneously require less computation and generate higher accuracy.
Accordingly, we further propose an algorithm involving only the top-$N$ similar
neighbors for each target user, which has both less computational complexity
and higher algorithmic accuracy.


title:
Nuclear-fission studies with relativistic secondary beams: analysis of
  fission channels

abstract:
  Nuclear fission of several neutron-deficient actinides and pre-actinides from
excitation energies around 11 MeV was studied at GSI Darmstadt by use of
relativistic secondary beams. The characteristics of multimodal fission of
nuclei around 226Th are systematically investigated and interpreted as the
superposition of three fission channels. Properties of these fission channels
have been determined for 15 systems. A global view on the properties of fission
channels including previous results is presented. The positions of the
asymmetric fission channels are found to be constant in element number over the
whole range of systems investigated.


title:
Event-Driven Dynamics of Rigid Bodies Interacting via Discretized
  Potentials

abstract:
  A framework for performing event-driven, adaptive time step simulations of
systems of rigid bodies interacting under stepped or terraced potentials in
which the potential energy is only allowed to have discrete values is outlined.
The scheme is based on a discretization of an underlying continuous potential
that effectively determines the times at which interaction energies change. As
in most event-driven approaches, the method consists of specifying a means of
computing the free motion, evaluating the times at which interactions occur,
and determining the consequences of interactions on subsequent motion for the
terraced-potential. The latter two aspects are shown to be simply expressible
in terms of the underlying smooth potential. Within this context, algorithms
for computing the times of interaction events and carrying out efficient
event-driven simulations are discussed. The method is illustrated on system
composed of rigid rods in which the constituents interact via a terraced
potential that depends on the relative orientations of the rods.


title:
Why many theories of shock waves are necessary. Kinetic functions,
  equivalent equations, and fourth-order models

abstract:
  We consider several systems of nonlinear hyperbolic conservation laws
describing the dynamics of nonlinear waves in presence of phase transition
phenomena. These models admit under-compressive shock waves which are not
uniquely determined by a standard entropy criterion but must be characterized
by a kinetic relation. Building on earlier work by LeFloch and collaborators,
we investigate the numerical approximation of these models by {\sl high-order}
finite difference schemes, and uncover several new features of the kinetic
function associated with with physically motivated second and third-order
regularization terms, especially viscosity and capillarity terms. On one hand,
the role of the equivalent equation associated with a finite difference scheme
is discussed. We conjecture here and demonstrate numerically that the
(numerical) kinetic function associated with a scheme approaches the (analytic)
kinetic function associated with the given model --especially since its
equivalent equation approaches the regularized model at a higher order. On the
other hand, we demonstrate numerically that a kinetic function can be
associated with the thin liquid film model and the generalized Camassa-Holm
model. Finally, we investigate to what extent a kinetic function can be
associated with the equations of van der Waals fluids, whose flux-function
admits two inflection points.


title: Multiple Scattering Methods in Casimir Calculations

abstract:
  Multiple scattering formulations have been employed for more than 30 years as
a method of studying the quantum vacuum or Casimir interactions between
distinct bodies. Here we review the method in the simple context of
$\delta$-function potentials, so-called semitransparent bodies. (In the limit
of strong coupling, a semitransparent boundary becomes a Dirichlet one.) After
applying the method to rederive the Casimir force between two semitransparent
plates and the Casimir self-stress on a semitransparent sphere, we obtain
expressions for the Casimir energies between disjoint parallel semitransparent
cylinders and between disjoint semitransparent spheres. Simplifications occur
for weak and strong coupling. In particular, after performing a power series
expansion in the ratio of the radii of the objects to the separation between
them, we are able to sum the weak-coupling expansions exactly to obtain
explicit closed forms for the Casimir interaction energy. The same can be done
for the interaction of a weak-coupling sphere or cylinder with a Dirichlet
plane. We show that the proximity force approximation (PFA), which becomes the
proximity force theorem when the objects are almost touching, is very poor for
finite separations.


title: Universality in Few-Body Systems

abstract:
  Low-energy universality in atomic few-body systems as a result of a large
two-body scattering length has gained a lot of attention recently. Here, I
discuss recent progress in describing the three-body recombination of cold
atoms in terms of a finite set of universal scaling functions and review
results for the recombination length of cesium-133 atoms obtained with these
functions. Furthermore, I will consider the inclusion of effective range
corrections and the relevance for further calculations in atomic and nuclear
physics.


title: Molding the flow of light at deep sub-wavelength scale

abstract:
  The diffractive nature of light has limited optics and photonics to operate
at scales much larger than the wavelength of light. The major challenge in
scaling-down integrated photonics is how to mold the light flow below
diffraction-limit in all three dimensions. A high index solid immersion lens
can improve the spatial resolution by increasing the medium refractive index,
but only to few times higher than in air. Photonic crystals can guide light in
three dimensions, however, the guided beam width is around a wavelength.
Surface plasmons has a potential to reach the sub-wavelength scales;
nevertheless, it is confined in the two-dimensional interface between metals
and dielectrics. Here, we present a new approach for molding the light flow at
the deep sub-wavelength scale, using metamaterials with uniquely designed
dispersion. We develop a design methodology for realizing sub-wavelength ray
optics, and demonstrate lambda/10 width light beams flow through
three-dimensional space.


title: Unparticle Searches Through Gamma Gamma Scattering

abstract:
  We investigate the effects of unparticles on gamma gamma--> gamma gamma
scattering for photon collider mode of the future multi-TeV e^+e^- linear
collider. We show the effects of unparticles on the differential, and total
scattering cross sections for different polarization configurations.
Considering 1-loop Standard Model background contributions from the charged
fermions, and W^{+-} bosons to the cross section, we calculate the upper limits
on the unparticle couplings lambda_0 to the photons for various values of the
scaling dimension d(1<d<2) at sqrt{s}=0.5-5 TeV.


title: Rotation set for maps of degree 1 on the graph sigma

abstract:
  For a continuous map on a topological graph containing a unique loop S it is
possible to define the degree and, for a map of degree 1, rotation numbers. It
is known that the set of rotation numbers of points in S is a compact interval
and for every rational r in this interval there exists a periodic point of
rotation number r. The whole rotation set (i.e. the set of all rotation
numbers) may not be connected and it is not known in general whether it is
closed.
  The graph sigma is the space consisting in an interval attached by one of its
endpoints to a circle. We show that, for a map of degree 1 on the graph sigma,
the rotation set is closed and has finitely many connected components.
Moreover, for all rational numbers r in the rotation set, there exists a
periodic point of rotation number r.


title:
The essential spectrum of the Laplacian on rapidly branching
  tessellations

abstract:
  In this paper we characterize emptiness of the essential spectrum of the
Laplacian under a hyperbolicity assumption for general graphs. Moreover we
present a characterization for emptiness of the essential spectrum for planar
tessellations in terms of curvature.


title: Update on semileptonic charm decays

abstract:
  A brief update is given on recent developments in the theory of exclusive
semileptonic charm decays. A check on analyticity arguments from the kaon
system is reviewed. Recent results on form factor shape measurements are
discussed.


title: Serre's Condition R_l for Affine Semigroup Rings

abstract:
  In this note we characterize the affine semigroup rings K[S] over an
arbitrary field K that satisfy condition R_l of Serre. Our characterization is
in terms of the face lattice of the positive cone pos(S) of S. We start by
reviewing some basic facts about the faces of pos(S) and consequences for the
monomial primes of K[S]. After proving our characterization we turn our
attention to the Rees algebras of a special class of monomial ideals in a
polynomial ring over a field. In this special case, some of the characterizing
criteria are always satisfied. We give examples of nonnormal affine semigroup
rings that satisfy R_2.


title:
Entanglement and density-functional theory: testing approximations on
  Hooke's atom

abstract:
  We present two methods of calculating the spatial entanglement of an
interacting electron system within the framework of density-functional theory.
These methods are tested on the model system of Hooke's atom for which the
spatial entanglement can be calculated exactly. We analyse how the strength of
the confining potential affects the spatial entanglement and how accurately the
methods that we introduced reproduce the exact trends. We also compare the
results with the outcomes of standard first-order perturbation methods. The
accuracies of energies and densities when using these methods are also
considered.


title: Lieb-Robinson Bounds for Harmonic and Anharmonic Lattice Systems

abstract:
  We prove Lieb-Robinson bounds for the dynamics of systems with an infinite
dimensional Hilbert space and generated by unbounded Hamiltonians. In
particular, we consider quantum harmonic and certain anharmonic lattice
systems.

categories: math-ph cond-mat.stat-mech math.MP quant-ph


title: Covariant entropy conjecture and concordance cosmological models

abstract:
  Recently a covariant entropy conjecture has been proposed for dynamical
horizons. We apply this conjecture to concordance cosmological models, namely,
those cosmological models filled with perfect fluids, in the presence of a
positive cosmological constant. As a result, we find this conjecture has a
severe constraint power. Not only does this conjecture rule out those
cosmological models disfavored by the anthropic principle, but also it imposes
an upper bound $10^{-60}$ on the cosmological constant for our own universe,
which thus provides an alternative macroscopic perspective for understanding
the long-standing cosmological constant problem.


title:
Spitzer 24-micron Time-Series Observations of the Eclipsing M-dwarf
  Binary GU Bootis

abstract:
  We present a set of {\it Spitzer} 24$\mu$m MIPS time series observations of
the M-dwarf eclipsing binary star GU Bo\"otis. Our data cover three secondary
eclipses of the system: two consecutive events and an additional eclipse six
weeks later. The study's main purpose is the long wavelength (and thus limb
darkening-independent) characterization of GU Boo's light curve, allowing for
independent verification of the results of previous optical studies. Our
results confirm previously obtained system parameters. We further compare GU
Boo's measured 24$\mu$m flux density to the value predicted by spectral fitting
and find no evidence for circumstellar dust. In addition to GU Boo, we
characterize (and show examples of) light curves of other objects in the field
of view. Analysis of these light curves serves to characterize the photometric
stability and repeatability of {\it Spitzer's} MIPS 24\micron array over short
(days) and long (weeks) timescales at flux densities between approximately
300--2,000$\mu$Jy. We find that the light curve root mean square about the
median level falls into the 1--4% range for flux densities higher than 1mJy.
Finally, we comment on the fluctuations of the 24\micron background on short
and long timescales.


title:
Multidimensional reconciliation for continuous-variable quantum key
  distribution

abstract:
  We propose a method for extracting an errorless secret key in a
continuous-variable quantum key distribution protocol, which is based on
Gaussian modulation of coherent states and homodyne detection. The crucial
feature is an eight-dimensional reconciliation method, based on the algebraic
properties of octonions. Since the protocol does not use any postselection, it
can be proven secure against arbitrary collective attacks, by using
well-established theorems on the optimality of Gaussian attacks. By using this
new coding scheme with an appropriate signal to noise ratio, the distance for
secure continuous-variable quantum key distribution can be significantly
extended.


title: Prospects in CP violation measurements at the Tevatron Collider

abstract:
  The Fermilab Tevatron Collider is currently the most copious source of
b-hadrons, thanks to the large b-bbar production cross-section in
  1.96 TeV ppbar collisions. Recent detector upgrades allow for a wide range of
CP violation and flavor-mixing measurements that are fully competitive
(asymmetries in self-tagging modes) or complementary (asymmetries of B_s and
b-baryons decays) with B-factories. In this paper we review some recent CP
violation results from the DO and CDF Collaborations and we discuss the
prospects for future measurements.


title: Tests of Machine Intelligence

abstract:
  Although the definition and measurement of intelligence is clearly of
fundamental importance to the field of artificial intelligence, no general
survey of definitions and tests of machine intelligence exists. Indeed few
researchers are even aware of alternatives to the Turing test and its many
derivatives. In this paper we fill this gap by providing a short survey of the
many tests of machine intelligence that have been proposed.


title: A Massive Neutron Star in the Globular Cluster M5

abstract:
  We report the results of 19 years of Arecibo timing for two pulsars in the
globular cluster NGC 5904 (M5), PSR B1516+02A (M5A) and PSR B1516+02B (M5B).
This has resulted in the measurement of the proper motions of these pulsars
and, by extension, that of the cluster itself. M5B is a 7.95-ms pulsar in a
binary system with a > 0.13 solar mass companion and an orbital period of 6.86
days. In deep HST images, no optical counterpart is detected within ~2.5 sigma
of the position of the pulsar, implying that the companion is either a white
dwarf or a low-mass main-sequence star. The eccentricity of the orbit (e =
0.14) has allowed a measurement of the rate of advance of periastron: (0.0142
+/-0.0007) degrees per year. We argue that it is very likely that this
periastron advance is due to the effects of general relativity, the total mass
of the binary system then being 2.29 +/-0.17 solar masses. The small measured
mass function implies, in a statistical sense, that a very large fraction of
this total mass is contained in the pulsar: 2.08 +/- 0.19 solar masses (1
sigma); there is a 5% probability that the mass of this object is < 1.72 solar
masses and a 0.77% probability that is is between 1.2 and 1.44 solar masses.
Confirmation of the median mass for this neutron star would exclude most
``soft'' equations of state for dense neutron matter. Millisecond pulsars
(MSPs) appear to have a much wider mass distribution than is found in double
neutron star systems; about half of these objects are significantly more
massive than 1.44 solar masses. A possible cause is the much longer episode of
mass accretion necessary to recycle a MSP, which in some cases corresponds to a
much larger mass transfer.


title: Chaos in an intermittently driven damped oscillator

abstract:
  We observe chaotic dynamics in a damped linear oscillator, which is driven
only at certain regions of phase space. Both deterministic and random drives
are studied. The dynamics is characterized using standard techniques of
nonlinear dynamics. Interchanging roles of determinism and stochasticity is
also considered.


title: Lie Algebroids and generalized projective structures on Riemann surfaces

abstract:
  The space of generalized projective structures on a Riemann surface $\Sigma$
of genus g with n marked points is the affine space over the cotangent bundle
to the space of SL(N)-opers. It is a phase space of $W_N$-gravity on
$\Sigma\times\mathbb{R}$.
  This space is a generalization of the space of projective structures on the
Riemann surface. We define the moduli space of $W_N$-gravity as a symplectic
quotient with respect to the canonical action of a special class of Lie
algebroids. This moduli space describes in particular the moduli space of
deformations of complex structures on the Riemann surface by differential
operators of finite order, or equivalently, by a quotient space of Volterra
operators. We call these algebroids the Adler-Gelfand-Dikii (AGD) algebroids,
because they are constructed by means of AGD bivector on the space of opers
restricted on a circle. The AGD-algebroids are particular case of Lie
algebroids related to a Poisson sigma-model. The moduli space of the
generalized projective structure can be described by cohomology of a
BRST-complex.


title: Quantum Property Testing of Group Solvability

abstract:
  Testing efficiently whether a finite set with a binary operation over it,
given as an oracle, is a group is a well-known open problem in the field of
property testing. Recently, Friedl, Ivanyos and Santha have made a significant
step in the direction of solving this problem by showing that it it possible to
test efficiently whether the input is an Abelian group or is far, with respect
to some distance, from any Abelian group. In this paper, we make a step further
and construct an efficient quantum algorithm that tests whether the input is a
solvable group, or is far from any solvable group. More precisely, the number
of queries used by our algorithm is polylogarithmic in the size of the set.


title: TCHR: a framework for tabled CLP

abstract:
  Tabled Constraint Logic Programming is a powerful execution mechanism for
dealing with Constraint Logic Programming without worrying about fixpoint
computation. Various applications, e.g in the fields of program analysis and
model checking, have been proposed. Unfortunately, a high-level system for
developing new applications is lacking, and programmers are forced to resort to
complicated ad hoc solutions.
  This papers presents TCHR, a high-level framework for tabled Constraint Logic
Programming. It integrates in a light-weight manner Constraint Handling Rules
(CHR), a high-level language for constraint solvers, with tabled Logic
Programming. The framework is easily instantiated with new application-specific
constraint domains. Various high-level operations can be instantiated to
control performance. In particular, we propose a novel, generalized technique
for compacting answer sets.


title:
Hopf bifurcation analysis in a dual model of Internet congestion control
  algorithm with communication delay

abstract:
  This paper focuses on the delay induced Hopf bifurcation in a dual model of
Internet congestion control algorithms which can be modeled as a time-delay
system described by a one-order delay differential equation (DDE). By choosing
communication delay as the bifurcation parameter, we demonstrate that the
system loses its stability and a Hopf bifurcation occurs when communication
delay passes through a critical value. Moreover, the bifurcating periodic
solution of system is calculated by means of perturbation methods. Discussion
of stability of the periodic solutions involves the computation of Floquet
exponents by considering the corresponding Poincare -Lindstedt series
expansion. Finally, numerical simulations for verify the theoretical analysis
are provided.


title:
Diagonal and Collinear Incommensurate Spin Structures in underdoped
  La$_{2-x}$Ba$_{x}$CuO$_{4}$

abstract:
  We have studied incommensurate spin ordering in single crystal underdoped
La_{2-x}Ba_{x}CuO_{4} with x~0.08, 0.05 and 0.025 using neutron scattering
techniques. Static incommensurate magnetic order is observed in the
La_{2-x}Ba_{x}CuO_{4} (x=0.05 and 0.025) compounds with ordering wavevectors
which are rotated by 45 degree about the commensurate (0.5,0.5,0) position,
with respect to that in the superconducting x=0.08 material. These spin
modulations are one dimensional in the x=0.05 and 0.025 samples, with ordering
wavevectors lying along the orthorhombic b* direction. Such a rotation in the
orientation of the static spin ordering as a function of increasing Ba doping,
from diagonal to collinear, is roughly coincident with the transition from an
insulating to a superconducting ground state and is similar to that observed in
the related La_{2-x}Sr_{x}CuO_{4} system. This phenomenon is therefore a
generic property of underdoped La-214 cuprates.


title:
Unknown selection effect simulates redshift periodicity in quasar number
  counts from Sloan Digital Sky Survey

abstract:
  Discrete Fourier analysis on the quasar number count, as a function of
redshift, $z$, calculated from the Sloan Digital Sky Survey DR6 release appears
to indicate that quasars have preferred periodic redshifts with redshift
intervals of 0.258, 0.312, 0.44, 0.63, and 1.1. However the same periods are
found in the mean of the $zConf$ parameter used to flag the reliability of the
spectroscopic measurements. It follows that these redshift periods must result
from some selection effect, as yet undetermined. It does not signal any
intrinsic (quantized) redshifts in the quasars.