title:
Micromagnetic simulations of small arrays of submicron ferromagnetic
  particles

abstract:
  We report the results of a set of simulations of small arrays of submicron
ferromagnetic particles. The actions of dipolar and exchange interactions were
qualitatively investigated by analysing the ferromagnetic resonance spectra at
9.37 GHz resulting from the magnetization response of con- nected and
unconnected particles in the array as a function of the applied dc magnetic
field. We find that the magnetization precession movement (at resonance)
observed in individual particles in the array presents a distinctive behaviour
(an amplitude mismatch) in comparison to isolated, one-particle reference
simulations, a result that we attribute to the action of interparticle dipolar
couplings. Exchange interactions appear to have an important role in modifying
the spectra of connected particles, even through a small contact surface.


title: Multipulse phases in k-mixtures of Bose-Einstein condensates

abstract:
  For a competitive system of k coupled nonlinear Schroedinger equations we
prove the existence, when the competition parameter is large, of positive
radial solutions on R^N. We show that, when the competition parameter goes to
infinity, the profile of each component separates, in many pulses, from the
others. Moreover, we can prescribe the location of such pulses in terms of the
oscillations of the changing-sign solutions of the scalar nonlinear
Schroedinger equation. Within an Hartree-Fock approximation, this provides a
theoretical indication of phase separation into many nodal domains for the
k-mixtures of Bose-Einstein condensates.


title:
The topological structure of SU(2) gluodynamics at T > 0 : an analysis
  using the Symanzik action and Neuberger overlap fermions

abstract:
  We study SU(2) gluodynamics at finite temperature on both sides of the
deconfining phase transition. We create the lattice ensembles using the
tree-level tadpole-improved Symanzik action. The Neuberger overlap Dirac
operator is used to determine the following three aspects of vacuum structure:
(i) The topological susceptibility is evaluated at various temperatures across
the phase transition, (ii) the overlap fermion spectral density is determined
and found to depend on the Polyakov loop above the phase transition and (iii)
the corresponding localization properties of low-lying eigenmodes are
investigated. Finally, we compare with zero temperature results.


title: The complete impurity scattering formalism in graphene

abstract:
  We present the complete formalism that describes scattering in graphene at
low-energies. We begin by analyzing the real-space free Green's function
matrix, and its analytical expansions at low-energy, carefully incorporating
the discrete lattice structure, and arbitrary forms of the atomic-orbital wave
function. We then compute the real-space Green's function in the presence of an
impurity. We express our results both in 2X2 and 4X4 forms (for the two
sublattices and the two inequivalent valleys of the first Brillouin zone). We
compare this with the 4X4 formalism proposed in cond-mat/0608228 and
cond-mat/0702019, and show that the latter is incomplete. We describe how it
can be adapted to accurately take into account the effects of inter-valley
scattering on spatially-varying quantities such as the local density of states.


title: Parametrizing fluids in canonical quantum gravity

abstract:
  The problem of time is an unsolved issue of canonical General Relativity. A
possible solution is the Brown-Kuchar mechanism which couples matter to the
gravitational field and recovers a physical, i.e. non vanishing, observable
Hamiltonian functional by manipulating the set of constraints. Two cases are
analyzed. A generalized scalar fluid model provides an evolutionary picture,
but only in a singular case. The Schutz' model provides an interesting
singularity free result: the entropy per baryon enters the definition of the
physical Hamiltonian. Moreover in the co-moving frame one is able to identify
the time variable tau with the logarithm of entropy.


title: Time-Dependent of Accretion Flow with Toroidal Magnetic Field

abstract:
  In the present study time evolution of quasi-spherical polytropic accretion
flow with toroidal magnetic field is investigated. The study especially focused
the astrophysically important case in which the adiabatic exponent
$\gamma=5/3$. In this scenario, it was assumed that the angular momentum
transport is due to viscous turbulence and used $\alpha$-prescription for
kinematic coefficient of viscosity. The equations of accretion flow are solved
in a simplified one-dimensional model that neglects the latitudinal dependence
of the flow. In order to solve the integrated equations which govern the
dynamical behavior of the accretion flow, self-similar solution was used. The
solution provides some insight into the dynamics of quasi-spherical accretion
flow and avoids many of the strictures of the steady self-similar solution. The
effect of the toroidal magnetic field is considered with additional variable
$\beta[=p_{mag}/p_{gas}]$, where $p_{mag}$ and $p_{gas}$ are the magnetic and
gas pressure, respectively. The solution indicates a transonic point in the
accretion flow, that this point approaches to central object by adding strength
of the magnetic field. Also, by adding strength of the magnetic field, the
radial-thickness of the disk decreases and the disk compresses. It was
analytically indicated that the radial velocity is only a function of Alfv'en
velocity. The model implies that the flow has differential rotation and is
sub-Keplerian at all radii.


title: Nonequilibrium phase transition due to social group isolation

abstract:
  We introduce a simple model of a growing system with $m$ competing
communities. The model corresponds to the phenomenon of defeats suffered by
social groups living in isolation. A nonequilibrium phase transition is
observed when at critical time $t_c$ the first isolated cluster occurs. In the
one-dimensional system the volume of the new phase, i.e. the number of the
isolated individuals, increases with time as $Z \sim t^3$. For a large number
of possible communities the critical density of filled space equals to $\rho_c
= (m/N)^{1/3}$ where $N$ is the system size. A similar transition is observed
for Erd\H{o}s-R\'{e}nyi random graphs and Barab\'{a}si-Albert scale-free
networks. Analytic results are in agreement with numerical simulations.


title: Gravitational collapse of a minimally coupled massless scalar field

abstract:
  We study here the evolution of a massless scalar field in a spacetime,
developing from a regular initial spacelike surface. The Einstein equations and
regularity and boundary conditions governing the same are specified. Both
homogeneous and inhomogeneous collapse models are considered and we analyze
when the occurrence of singularity will be simultaneous or otherwise. In the
inhomogeneous collapse case, we characterize a wide family of black hole
solutions arising in scalar field collapse. We also discuss the possibility of
existence of classes of non-singular models where collapse could almost freeze
if suitable conditions are satisfied.


title: Spin-Based Quantum Computers made by Chemistry: Hows and Whys

abstract:
  This introductory review discusses the main problems facing the attempt to
build quantum information processing systems (like quantum computers) from
spin-based qubits. We emphasize 'bottom-up' attempts using methods from
chemistry. The essentials of quantum computing are explained, along with a
description of the qubits and their interactions in terms of physical spin
qubits. The main problem to be overcome is decoherence - how this works is
described, along with ways to suppress contributions from spin bath and
oscillator bath environments, and from dipolar interactions. Finally we discuss
various strategies for making chemistry-based spin qubits, using both magnetic
molecules and magnetic ions.


title: Decoherence and Entanglement Dynamics of Coupled Qubits

abstract:
  We study the entanglement dynamics and relaxation properties of a system of
two interacting qubits in the two cases (I) two independent bosonic baths and
(II) one common bath, at temperature T. The entanglement dynamics is studied in
terms of the concurrence C (t) between the two spins and of the von Neumann
entropy S(t) with respect to the bath, as a function of time. We prove that the
system does thermalize. In the case (II) of a single bath, the existence of a
decoherence-free (DFS) subspace makes entanglement dynamics very rich. We show
that when the system is initially in a state with a component in the DFS the
relaxation time is surprisingly long, showing the existence of semi-decoherence
free subspaces. The equilibrium state in this case is not the Gibbs state. The
entanglement dynamics for the single bath case is also studied as a function of
temperature, coupling strength with the environment and strength of tunneling
coupling. The case of the mixed state is finally shown and discussed.


title:
A clumpy-cloud PDR model of the global far-infrared line emission of the
  Milky Way

abstract:
  The fractal structure of the interstellar medium suggests that the
interaction of UV radiation with the ISM as described in the context of
photon-dominated regions (PDR) dominates most of the physical and chemical
conditions, and hence the far-infrared and submm emission from the ISM in the
Milky Way. We investigate to what extent the Galactic FIR line emission of the
important species CO, C, C+, and O, as observed by the Cosmic Background
Explorer (COBE) satellite can be modeled in the framework of a clumpy,
UV-penetrated cloud scenario. The far-infrared line emission of the Milky Way
is modeled as the emission from an ensemble of clumps with a power law clump
mass spectrum and mass-size relation with power-law indices consistent with the
observed ISM structure. The individual clump line intensities are calculated
using the KOSMA-tau PDR-model for spherical clumps. The model parameters for
the cylindrically symmetric Galactic distribution of the mass density and
volume filling factor are determined by the observed radial distributions. A
constant FUV intensity, in which the clumps are embedded, is assumed. We show
that this scenario can explain, without any further assumptions and within a
factor of about 2, the absolute FIR-line intensities and their distribution
with Galactic longitude as observed by COBE.


title: Fluids as Dynamic Templates for Cytoskeletal Proteins in Plant Cells

abstract:
  The Dynamic Template model of biological cell membranes and the cytoplasm as
spatially organised fluid layers is extended to plant cells, and is shown to
offer a feasible shear driven mechanism for the co-alignment of internal and
external fibres observed during growth and tropic responses


title: The quark-gluon plasma, turbulence, and quantum mechanics

abstract:
  Quark-gluon plasmas formed in heavy ion collisions at high energies are well
described by ideal classical fluid equations with nearly zero viscosity. It is
believed that a similar fluid permeated the entire universe at about three
microseconds after the big bang. The estimated Reynolds number for this
quark-gluon plasma at 3 microseconds is approximately 10^19. The possibility
that quantum mechanics may be an emergent property of a turbulent proto-fluid
is tentatively explored. A simple relativistic fluid equation which is
consistent with general relativity and is based on a cosmic dust model is
studied. A proper time transformation transforms it into an inviscid Burgers
equation. This is analyzed numerically using a spectral method. Soliton-like
solutions are demonstrated for this system, and these interact with the known
ergodic behavior of the fluid to yield a stochastic and chaotic system which is
time reversible. Various similarities to quantum mechanics are explored.


title:
The Dynamic Template Mechanism - A Co-Ordination Role for Shear, Thermal
  and Electrical Stressors in Muscle Cell Contraction

abstract:
  The Dynamic Template is applied to muscle cells, and is shown to provide a
feedback mechanism that can co-ordinate the rearrangements of cytoskeletal
proteins that accompany contraction


title:
Kappa-deformed oscillators, the choice of star product and free
  kappa-deformed quantum fields

abstract:
  In order to obtain free kappa-deformed quantum fields (with c-number
commutators) we proposed new concept of kappa-deformed oscillator algebra [1]
and the modification of kappa-star product [2], implementing in the product of
two quantum fields the change of standard kappa-deformed mass-shell conditions.
We recall here that the kappa-deformed oscillators recently introduced in
[3]-[5] lie on standard kappa-deformed mass-shell. Firstly, we study
kappa-deformed fields with the standard kappa-star product, what implies that
in the oscillator algebra the corresponding kappa-deformed oscillators lie on
standard kappa-deformed mass-shell. We argue that for the kappa-deformed
algebra of such field oscillators which carry fourmomenta on kappa-deformed
mass-shell it is not possible to obtain the free quantum kappa-deformed fields
with the c-number commutators. Further, we study kappa-deformed quantum fields
with the modified kappa-star product which implies the modification of
kappa-deformed mass-shell. We obtain large class of kappa-deformed statistics
depending on six arbitrary functions which provides the c-number field
commutator functions. Such general class of kappa-oscillators can be described
as the kappa-deformation of standard oscillator algebra obtained by composing
general kappa-deformed multiplication with the deformation of the flip
operator.


title: Exploring Parameter Spaces in Dynamical Systems

abstract:
  The parameter space of dynamical systems arising in applications is often
found to be high-dimensional and difficult to explore. We construct a fast
algorithm to numerically analyze "quantitative features" of dynamical systems
depending on parameters. Using a classical problem from mathematical ecology as
an example, we demonstrate how to apply the algorithm to investigate the
amplitude of a limit cycle depending on seven parameters. We stress the
practical value of the algorithm but we also provide a rigorous error analysis
to justify the overall strategy. Our approach turns out to be particularly
useful in the case of comparing experimental data to a model defined by
differential equations and to investigate whether the equations can approximate
the modeled system.


title: A "typical" contraction is unitary

abstract:
  We show that (for the weak operator topology) the set of unitary operators on
a separable infinite-dimensional Hilbert space is residual in the set of all
contractions. The analogous result holds for isometries and the strong operator
topology as well. These results are applied to the problem of embedding
operators into strongly continuous semigroups.


title: Elliptic aspects of statistical mechanics on spheres

abstract:
  Our earlier results on the temperature inversion properties and the
ellipticisation of the finite temperature internal energy on odd spheres are
extended to orbifold factors of odd spheres and then to other thermodynamic
quantities, in particular to the specific heat. The behaviour under modular
transformations is facilitated by the introduction of a modular covariant
derivative and it is shown that the specific heat on any odd sphere can be
expressed in terms of just three functions. It is also shown that the free
energy on the circle can be written elliptically.


title:
A multiphysics and multiscale software environment for modeling
  astrophysical systems

abstract:
  We present MUSE, a software framework for combining existing computational
tools for different astrophysical domains into a single multiphysics,
multiscale application. MUSE facilitates the coupling of existing codes written
in different languages by providing inter-language tools and by specifying an
interface between each module and the framework that represents a balance
between generality and computational efficiency. This approach allows
scientists to use combinations of codes to solve highly-coupled problems
without the need to write new codes for other domains or significantly alter
their existing codes. MUSE currently incorporates the domains of stellar
dynamics, stellar evolution and stellar hydrodynamics for studying generalized
stellar systems. We have now reached a "Noah's Ark" milestone, with (at least)
two available numerical solvers for each domain. MUSE can treat multi-scale and
multi-physics systems in which the time- and size-scales are well separated,
like simulating the evolution of planetary systems, small stellar associations,
dense stellar clusters, galaxies and galactic nuclei.
  In this paper we describe three examples calculated using MUSE: the merger of
two galaxies, the merger of two evolving stars, and a hybrid N-body simulation.
In addition, we demonstrate an implementation of MUSE on a distributed computer
which may also include special-purpose hardware, such as GRAPEs or GPUs, to
accelerate computations. The current MUSE code base is publicly available as
open source at http://muse.li


title: Multi-Instance Learning by Treating Instances As Non-I.I.D. Samples

abstract:
  Multi-instance learning attempts to learn from a training set consisting of
labeled bags each containing many unlabeled instances. Previous studies
typically treat the instances in the bags as independently and identically
distributed. However, the instances in a bag are rarely independent, and
therefore a better performance can be expected if the instances are treated in
an non-i.i.d. way that exploits the relations among instances. In this paper,
we propose a simple yet effective multi-instance learning method, which regards
each bag as a graph and uses a specific kernel to distinguish the graphs by
considering the features of the nodes as well as the features of the edges that
convey some relations among instances. The effectiveness of the proposed method
is validated by experiments.


title: Atomic and optical tests of Lorentz symmetry

abstract:
  This article reports on the Fourth Meeting on Lorentz and CPT Symmetry, CPT
'07, held in August 2007 in Bloomington, Indiana, USA. The focus is on recent
tests of Lorentz symmetry using atomic and optical physics. Results presented
at the meeting include improved bounds on Lorentz violation in the photon
sector, and the first bounds on several coefficients in the gravity sector.


title: Useful vacancies in Single Wall Carbon Nanotubes

abstract:
  The electronic and structural properties of zigzag and armchair single-wall
carbon nanotubes (SWCNT) with a single vacancy or two vacancies located at
various distances have been obtained within the frame of the Density Function
Theory (DFT) and a Molecular Dynamics method. It is found that the vacancy
defects interact at long ranges in armchair SWCNTs unlike the short-range
interaction in zigzag SWCNTs. The density of states for different vacancy
densities shows that the local energy gap shrinks with the vacancy density
increase. This and other results of the investigation provide insight into
understanding the relation between the local deformation of a defective
nanotube and its measurable electronic properties.


title: Non-existence of Extended Holographic Dark Energy with Hubble Horizon

abstract:
  The extended holographic dark energy model with the Hubble horizon as the
infrared cutoff avoids the problem of the circular reasoning of the holographic
dark energy model. We show that the infrared cutoff of the extended holographic
dark energy model cannot be the Hubble horizon provided that the Brans-Dicke
parameter $\omega$ satisfies the experimental constraint $\omega> 10^4$, and
this is proved as a no-go theorem. The no-go theorem also applies to the case
in which the dark matter interacts with the dark energy.


title: Fringe tracking and spatial filtering: phase jumps and dropouts

abstract:
  Fringe tracking in interferometers is typically analyzed with the implicit
assumption that there is a single phase associated with each telescope in the
array. If the telescopes have apertures significantly larger than r0 and only
partial adaptive optics correction, then the phase measured by a fringe sensor
may differ significantly from the "piston" component of the aperture phase. In
some cases, speckle noise will cause "branch points" in the measured phase as a
function of time, causing large and sudden jumps in the phase. We present
simulations showing these effects in order to understand their implications for
the design of fringe tracking algorithms.


title:
Effective one-dimensional dynamics of elongated Bose-Einstein
  condensates

abstract:
  By using a variational approach in combination with the adiabatic
approximation we derive a new effective 1D equation of motion for the axial
dynamics of elongated condensates. For condensates with vorticity $|q|=0$ or 1,
this equation coincides with our previous proposal [A. Mu\~noz Mateo and V.
Delgado, Phys. Rev. A \textbf{77}, 013617 (2008)]. We also rederive the
nonpolynomial Schr\"{o}dinger equation (NPSE) in terms of the adiabatic
approximation. This provides a unified treatment for obtaining the different
effective equations and allows appreciating clearly the differences and
similarities between the various proposals. We also obtain an expression for
the axial healing length of cigar-shaped condensates and show that, in the
local density approximation and in units of the axial oscillator length, it
coincides with the inverse of the condensate axial half-length. From this
result it immediately follows the necessary condition for the validity of the
local density approximation. Finally, we obtain analytical formulas that give
the frequency of the axial breathing mode with accuracy better than 1%. These
formulas can be relevant from an experimental point of view since they can be
expressed in terms only of the axial half-length and remain valid in the
crossover between the Thomas-Fermi and the quasi-1D mean-field regimes. We have
corroborated the validity of our results by numerically solving the full 3D
Gross-Pitaevskii equation.


title: Hyperbolic subdiffusive impedance

abstract:
  We use the hyperbolic subdiffusion equation with fractional time derivatives
(the generalized Cattaneo equation) to study the transport process of
electrolytes in media where subdiffusion occurs. In this model the flux is
delayed in a non-zero time with respect to the concentration gradient. In
particular, we obtain the formula of electrochemical subdiffusive impedance of
a spatially limited sample in the limit of large and of small pulsation of the
electric field. The boundary condition at the external wall of the sample are
taken in the general form as a linear combination of subdiffusive flux and
concentration of the transported particles. We also discuss the influence of
the equation parameters (the subdiffusion parameter and the delay time) on the
Nyquist impedance plots.


title: Solid-solid transition of the size-polydisperse hard-sphere system

abstract:
  The solid-solid coexistence of a polydisperse hard sphere system is studied
by using the Monte Carlo simulation. The results show that for large enough
polydispersity the solid-solid coexistence state is more stable than the
single-phase solid. The two coexisting solids have different composition
distributions but the same crystal structure. Moreover, there is evidence that
the solid-solid transition terminates in a critical point as in the case of the
fluid-fluid transition.


title:
Intrinsic peculiarities of real material realizations of a spin-1/2
  kagome lattice

abstract:
  Spin-1/2 magnets with kagome geometry, being for years a generic object of
theoretical investigations, have few real material realizations. Recently, a
DFT-based microscopic model for two such materials, kapellasite Cu3Zn(OH)6Cl2
and haydeeite Cu3Mg(OH)6Cl2, was presented [O. Janson, J. Richter and H.
Rosner, arXiv:0806.1592]. Here, we focus on the intrinsic properties of real
spin-1/2 kagome materials having influence on the magnetic ground state and the
low-temperature excitations. We find that the values of exchange integrals are
strongly dependent on O--H distance inside the hydroxyl groups, present in most
spin-1/2 kagome compounds up to date. Besides the original kagome model,
considering only the nearest neighbour exchange, we emphasize the crucial role
of the exchange along the diagonals of the kagome lattice.


title: General F-Term Gauge Mediation

abstract:
  In a model-independent formalism of gauge mediation, Meade, Seiberg, and Shih
have shown that hidden sector effects are captured by two-point correlation
functions of the gauge current superfields and that, generically, many of the
characteristic features of gauge mediated SUSY breaking do not survive. We
review the general story, particularly the way that the correlators enter the
low-energy effective action and give rise to soft-breaking terms. We then
specialize to the case where there is a small parameter, F/m^2, where m is the
mass scale characterizing the hidden sector, and F is the strength of the SUSY
breaking. To leading nontrivial order in this small parameter, we show that
many of the classic predictions of gauge mediated SUSY breaking are recovered.


title: The NeXT Mission

abstract:
  The NeXT (New exploration X-ray Telescope), the new Japanese X-ray Astronomy
Satellite following Suzaku, is an international X-ray mission which is
currently planed for launch in 2013. NeXT is a combination of wide band X-ray
spectroscopy (3 - 80 keV) provided by multi-layer coating, focusing hard X-ray
mirrors and hard X-ray imaging detectors, and high energy-resolution soft X-ray
spectroscopy (0.3 - 10 keV) provided by thin-foil X-ray optics and a
micro-calorimeter array. The mission will also carry an X-ray CCD camera as a
focal plane detector for a soft X-ray telescope and a non-focusing soft
gamma-ray detector. With these instruments, NeXT covers very wide energy range
from 0.3 keV to 600 keV. The micro-calorimeter system will be developed by
international collaboration lead by ISAS/JAXA and NASA. The simultaneous broad
bandpass, coupled with high spectral resolution of Delta E ~ 7 eV by the
micro-calorimeter will enable a wide variety of important science themes to be
pursued.


title:
Regulation of signal duration and the statistical dynamics of kinase
  activation by scaffold proteins

abstract:
  Scaffolding proteins that direct the assembly of multiple kinases into a
spatially localized signaling complex are often essential for the maintenance
of an appropriate biological response. Although scaffolds are widely believed
to have dramatic effects on the dynamics of signal propagation, the mechanisms
that underlie these consequences are not well understood. Here, Monte Carlo
simulations of a model kinase cascade are used to investigate how the temporal
characteristics of signaling cascades can be influenced by the presence of
scaffold proteins. Specifically, we examine the effects of spatially localizing
kinase components on a scaffold on signaling dynamics. The simulations indicate
that a major effect that scaffolds exert on the dynamics of cell signaling is
to control how the activation of protein kinases is distributed over time.
Scaffolds can influence the timing of kinase activation by allowing for kinases
to become activated over a broad range of times, thus allowing for signaling at
both early and late times. Scaffold concentrations that result in optimal
signal amplitude also result in the broadest distributions of times over which
kinases are activated. These calculations provide insights into one mechanism
that describes how the duration of a signal can potentially be regulated in a
scaffold mediated protein kinase cascade. Our results illustrate another
complexity in the broad array of control properties that emerge from the
physical effects of spatially localizing components of kinase cascades on
scaffold proteins.


title: Electronic structure of the iron-based superconductor LaOFeP

abstract:
  The recent discovery of superconductivity in the so-called iron-oxypnictide
family of compounds has generated intense interest. The layered crystal
structure with transition metal ions in planar square lattice form and the
discovery of spin-density-wave order near 130 K seem to hint at a strong
similarity with the copper oxide superconductors. A burning current issue is
the nature of the ground state of the parent compounds. Two distinct classes of
theories have been put forward depending on the underlying band structures:
local moment antiferromagnetic ground state for strong coupling approach and
itinerant ground state for weak coupling approach. The local moment magnetism
approach stresses on-site correlations and proximity to a Mott insulating state
and thus the resemblance to cuprates; while the latter approach emphasizes the
itinerant electron physics and the interplay between the competing
ferromagnetic and antiferromagnetic fluctuations. Such a controversy is partly
due to the lack of conclusive experimental information on the electronic
structures. Here we report the first angle-resolved photoemission spectroscopy
(ARPES) investigation of LaOFeP (Tc = 5.9 K), the first reported iron-based
superconductor. Our results favor the itinerant ground state, albeit with band
renormalization. In addition, our data reveal important differences between
these and copper based superconductors.


title: Tensor-entanglement renormalization group approach to topological phases

abstract:
  The tensor-entanglement renormalization group approach is applied to
Hamiltonians that realize a class of topologically ordered states -- string-net
condensed states. We analyze phase transitions between phases with and without
string-net condensation. These phase transitions change topological order
without changing any symmetries. This demonstrates that the tensor-entanglement
renormalization group approach can be used to study the phase diagram of a
quantum system with topologically ordered phases.


title: Altruism in Atomic Congestion Games

abstract:
  This paper studies the effects of introducing altruistic agents into atomic
congestion games. Altruistic behavior is modeled by a trade-off between selfish
and social objectives. In particular, we assume agents optimize a linear
combination of personal delay of a strategy and the resulting increase in
social cost. Our model can be embedded in the framework of congestion games
with player-specific latency functions. Stable states are the Nash equilibria
of these games, and we examine their existence and the convergence of
sequential best-response dynamics. Previous work shows that for symmetric
singleton games with convex delays Nash equilibria are guaranteed to exist. For
concave delay functions we observe that there are games without Nash equilibria
and provide a polynomial time algorithm to decide existence for symmetric
singleton games with arbitrary delay functions. Our algorithm can be extended
to compute best and worst Nash equilibria if they exist. For more general
congestion games existence becomes NP-hard to decide, even for symmetric
network games with quadratic delay functions. Perhaps surprisingly, if all
delay functions are linear, then there is always a Nash equilibrium in any
congestion game with altruists and any better-response dynamics converges. In
addition to these results for uncoordinated dynamics, we consider a scenario in
which a central altruistic institution can motivate agents to act
altruistically. We provide constructive and hardness results for finding the
minimum number of altruists to stabilize an optimal congestion profile and more
general mechanisms to incentivize agents to adopt favorable behavior.


title: Markov Stochastic Operators of Heredity

abstract:
  Applying non-ergodic quadratic stochastic operator the continual family of
weak ergodic non-homogeneous Markov chains is constructed.


title: Rydberg Borromean Trimers

abstract:
  A Rydberg and a ground-state atom can form ultralong range diatomic molecules
provided the interaction between the ground-state atom and the Rydberg electron
is attractive [C. H. Greene, et al., Phys. Rev. Lett. 85, 2458 (2000)]. A
repulsive interaction does not support bound states. However, as we will show,
adding a second ground-state atom, a bound triatomic molecule becomes possible
constituting a Borromean Rydberg system.


title:
Study of hadronic transitions between Y states and observation of
  Y(4S)-> eta Y(1S) decay

abstract:
  We present a study of hadronic transitions between Y(mS) (m=4,3,2) and Y(nS)
(n=2,1) resonances based on 347.5\invfb of data taken with the BABAR detector
at the PEP-II storage rings. We report the first observation of Y(4S)-> eta
Y(1S) decay with a branching fraction BR((Y(4S)->eta Y(1S))=(1.96+-0.06_{stat}
+-0.09_{syst}) x 10^{-4} and measure the ratio of partial widths
Gamma(Y(4S)->etaY(1S))/Gamma(Y(4S)->pi+pi-Y(1S))=2.41+- 0.40_{stat}+-
0.12_{syst}. We set 90% CL upper limits on the ratios
Gamma(Y(2S)->etaY(1S))/Gamma(Y(2S)->pi+pi-Y(1S))<5.2 x10^{-3}$ and
Gamma(Y(3S)->etaY(1S))/Gamma(Y(3S)->pi+pi-Y(1S))<1.9x10^{-2}. We also present
new measurements of the ratios
Gamma(Y(4S)->pi+pi-Y(2S))/Gamma(Y(4S)->pi+pi-Y(1S))=1.16+- 0.16_{stat}+-
0.14_{syst} and Gamma(Y(3S)->pi+pi-Y(2S))/Gamma(Y(3S)->pi+pi-Y(1S))=0.577+-
0.026_{stat}+- 0.060_{syst}.


title: Single exciton spectroscopy of single-Mn doped InAs quantum dots

abstract:
  The optical spectroscopy of a single InAs quantum dot doped with a single Mn
atom is studied using a model Hamiltonian that includes the exchange
interactions between the spins of the quantum dot electron-hole pair, the Mn
atom and the acceptor hole. Our model permits to link the photoluminescence
spectra to the Mn spin states after photon emission. We focus on the relation
between the charge state of the Mn, $A^0$ or $A^-$, and the different spectra
which result through either band-to-band or band-to-acceptor transitions. We
consider both neutral and negatively charged dots. Our model is able to account
for recent experimental results on single Mn doped InAs PL spectra and can be
used to account for future experiments in GaAs quantum dots. Similarities and
differences with the case of single Mn doped CdTe quantum dots are discussed.


title: Compression of Finite Group Actions and Covariant Dimension, II

abstract:
  Let $G$ be a finite group and $\phi : V\to W$ an equivariant morphism of
finite dimensional $G$-modules. We say that $\phi$ is faithful if $G$ acts
faithfully on $\phi(V)$. The covariant dimension of $G$ is the minimum of the
dimension of $\bar{\phi(V)}$ taken over all faithful $\phi$. In \cite{KS07} we
investigated covariant dimension and were able to determine it in many cases.
Our techniques largely depended upon finding homogeneous faithful covariants.
After publication of \cite{KS07}, the junior author of this article pointed out
several gaps in our proofs. Fortunately, this inspired us to find better
techniques, involving multihomogeneous covariants, which have enabled us to
extend and complete the results, simplify the proofs and fill the gaps of
\cite{KS07}.


title:
Second-order matter density perturbations and skewness in scalar-tensor
  modified gravity models

abstract:
  We study second-order cosmological perturbations in scalar-tensor models of
dark energy that satisfy local gravity constraints, including f(R) gravity. We
derive equations for matter fluctuations under a sub-horizon approximation and
clarify conditions under which first-order perturbations in the scalar field
can be neglected relative to second-order matter and velocity perturbations. We
also compute the skewness of the matter density distribution and find that the
difference from the LCDM model is only less than a few percent even if the
growth rate of first-order perturbations is significantly different from that
in the LCDM model. This shows that the skewness provides a model-independent
test for the picture of gravitational instability from Gaussian initial
perturbations including scalar-tensor modified gravity models.


title: Methods in Industrial Biotechnology for Chemical Engineers

abstract:
  In keeping with the definition that biotechnology is really no more than a
name given to a set of techniques and processes, the authors apply some set of
fuzzy techniques to chemical industry problems such as finding the proper
proportion of raw mix to control pollution, to study flow rates, to find out
the better quality of products. We use fuzzy control theory, fuzzy neural
networks, fuzzy relational equations, genetic algorithms to these problems for
solutions. When the solution to the problem can have certain concepts or
attributes as indeterminate, the only model that can tackle such a situation is
the neutrosophic model. The authors have also used these models in this book to
study the use of biotechnology in chemical industries.
  This book has six chapters. First chapter gives a brief description of
biotechnology. Second chapter deals will proper proportion of mix of raw
materials in cement industries to minimize pollution using fuzzy control
theory. Chapter three gives the method of determination of temperature set
point for crude oil in oil refineries. Chapter four studies the flow rates in
chemical industries using fuzzy neutral networks. Chapter five gives the method
of minimization of waste gas flow in chemical industries using fuzzy linear
programming. The final chapter suggests when in these studies indeterminancy is
an attribute or concept involved, the notion of neutrosophic methods can be
adopted.


title:
Multiloop Lie algebras and the construction of extended affine Lie
  algebras

abstract:
  It is known that a multiloop Lie algebra, which constructed using multiloop
realization, can be a Lie torus if the given multiloop Lie algebra satisfies
several conditions, and it is also known that a family of extended affine Lie
algebras (EALAs) are obtained from a Lie torus. In many cases, however, even if
a given multiloop Lie algebra does not satisfy these conditions, we can also
construct a family of EALAs from it. In this paper, we study this construction,
and prove that two families of EALAs constructed from two multiloop Lie
algebras coincide up to isomorphisms as EALAs if and only if two multiloop Lie
algebras are "support-isomorphic". Also, we give a necessary and sufficient
condition for two multiloop Lie algebras to be support-isomorphic.


title: The Realistic Lattice Determination of alpha_s(M_Z) Revisited

abstract:
  We revisit the earlier determination of alpha_s(M_Z) via perturbative
analyses of short-distance-sensitive lattice observables, incorporating new
lattice data and performing a modified version of the original analysis. We
focus on two high-intrinsic-scale observables, log(W_11) and log(W_12), and one
lower-intrinsic scale observable, log(W_{12}/u_0^6), finding improved
consistency among the values extracted using the different observables and a
final result, alpha_s(M_Z)=0.1192(11), 2 sigma higher than the earlier result,
in excellent agreement with recent non-lattice determinations and, in addition,
in good agreement with the results of a similar, but not identical, re-analysis
by the HPQCD Collaboration. A discussion of the relation between the two
re-analyses is given, focussing on the complementary aspects of the two
approaches.


title: Canonical quantum potential scattering theory

abstract:
  A new formulation of potential scattering in quantum mechanics is developed
using a close structural analogy between partial waves and the classical
dynamics of many non-interacting fields. Using a canonical formalism we find
non-linear first-order differential equations for the low energy scattering
parameters like scattering length and effective range. They significantly
simplify typical calculations, as we illustrate for atom-atom and
neutron-nucleus scattering systems. A generalization to charged particle
scattering is also possible.


title: NLO contributions to $B \to K K^*$ Decays in the pQCD approach

abstract:
  We calculate the important next-to-leading-order (NLO) contributions to the
$B \to K K^*$ decays from the vertex corrections, the quark loops, and the
magnetic penguins in the perturbative QCD (pQCD) factorization approach. The
pQCD predictions for the CP-averaged branching ratios are $Br(B^+ \to K^+
\bar{K}^{*0}) \approx 3.2\times 10^{-7}$, $Br(B^+ \to \bar{K}^0 {K}^{*+})
\approx 2.1\times 10^{-7}$, $Br(B^0/\ov{B}^0 \to K^0\bar{K}^{*0}+\bar{K}^0
K^{*0}) \approx 8.5\times 10^{-7}$, $Br(B^0/\ov{B}^0 \to K^+K^{*-} + K^-K^{*+})
\approx 1.3\times 10^{-7}$, which agree well with both the experimental upper
limits and the predictions based on the QCD factorization approach.
Furthermore, the CP-violating asymmetries of the considered decay modes are
also evaluated. The NLO pQCD predictions for $\acp(B^+ \to K^+\bar{K}^{*0})$
and $\acp(B^+ \to K^{*+}\bar{K}^{0})$ are $\acp^{dir}(K^+\bar{K}^{*0})\approx
-6.9 %$ and $\acp^{dir}(K^{*+}\bar{K}^0)\approx 6.5 %$.


title: Beyond Node Degree: Evaluating AS Topology Models

abstract:
  Many models have been proposed to generate Internet Autonomous System (AS)
topologies, most of which make structural assumptions about the AS graph. In
this paper we compare AS topology generation models with several observed AS
topologies. In contrast to most previous works, we avoid making assumptions
about which topological properties are important to characterize the AS
topology. Our analysis shows that, although matching degree-based properties,
the existing AS topology generation models fail to capture the complexity of
the local interconnection structure between ASs. Furthermore, we use BGP data
from multiple vantage points to show that additional measurement locations
significantly affect local structure properties, such as clustering and node
centrality. Degree-based properties, however, are not notably affected by
additional measurements locations. These observations are particularly valid in
the core. The shortcomings of AS topology generation models stems from an
underestimation of the complexity of the connectivity in the core caused by
inappropriate use of BGP data.


title:
$B \to \rho(\omega, \phi) \etap $ Decays and NLO contributions in the
  pQCD Approach

abstract:
  By employing the perturbative QCD (pQCD) factorization approach, we
calculated some important next-to-leading-order(NLO) contributions to the
two-body charmless hadronic decays $B^+ \to \rho^+ \eta^{(\prime)}$ and $B^0
\to \rho^0(\omega, \phi) \eta^{(\prime)}$, induced by the vertex QCD
corrections, the quark-loops as well as the chromo-magnetic penguins. From the
numerical results and phenomenological analysis we find that (a) for $B^\pm \to
\rho^\pm \etap$ decays, the partial NLO contributions to branching ratios are
small in magnitude; (b) for $B^0 \to \rho^0(\omega,\phi) \etap$ decays, the NLO
contributions can provide significant enhancements to the leading order
predictions of their branching ratios; and (c) the pQCD predictions for the
CP-violating asymmetries $\acp^{dir}(B^\pm \to \rho^\pm \etap)$ are consistent
with the data, while the predicted $\acp(B^0 \to \rho^0(\omega)\etap)$ are
generally large in magnitude and could be tested by the forthcoming LHCb
experiments.


title:
Multiwavelength observations of a giant flare on CN Leonis I. The
  chromosphere as seen in the optical spectra

abstract:
  Flares on dM stars contain plasmas at very different temperatures and thus
affect a wide wavelength range in the electromagnetic spectrum. While the
coronal properties of flares are studied best in X-rays, the chromosphere of
the star is observed best in the optical and ultraviolet ranges. Therefore,
multiwavelength observations are essential to study flare properties throughout
the atmosphere of a star. We analysed simultaneous observations with UVES/VLT
and XMM-Newton of the active M5.5 dwarf CN Leo (Gl 406) exhibiting a major
flare. The optical data cover the wavelength range from 3000 to 10000 Angstrom.
  From our optical data, we find an enormous wealth of chromospheric emission
lines occurring throughout the spectrum. We identify a total of 1143 emission
lines, out of which 154 are located in the red arm, increasing the number of
observed emission lines in this red wavelength range by about a factor of 10.
Here we present an emission line list and a spectral atlas. We also find line
asymmetries for H I, He I, and Ca II lines. For the last, this is the first
observation of asymmetries due to a stellar flare. During the flare onset,
there is additional flux found in the blue wing, while in the decay phase,
additional flux is found in the red wing. We interpret both features as caused
by mass motions. In addition to the lines, the flare manifests itself in the
enhancement of the continuum throughout the whole spectrum, inverting the
normal slope for the net flare spectrum.


title: A concise review on THGEM detectors

abstract:
  We briefly review the concept and properties of the Thick GEM (THGEM); it is
a robust, high-gain gaseous electron multiplier, manufactured economically by
standard printed-circuit drilling and etching technology. Its operation and
structure resemble that of GEMs but with 5 to 20-fold expanded dimensions. The
millimeter-scale hole-size results in good electron transport and in large
avalanche-multiplication factors, e.g. reaching 10^7 in double-THGEM cascaded
single-photoelectron detectors. The multiplier's material, parameters and shape
can be application-tailored; it can operate practically in any counting gas,
including noble gases, over a pressure range spanning from 1 mbar to several
bars; its operation at cryogenic (LAr) conditions was recently demonstrated.
The high gain, sub-millimeter spatial resolution, high counting-rate
capability, good timing properties and the possibility of industrial production
capability of large-area robust detectors, pave ways towards a broad spectrum
of potential applications; some are discussed here in brief.


title: Growth in SL_3(Z/pZ)

abstract:
  Let G=SL_3(Z/pZ), p a prime. Let A be a set of generators of G. Then A grows
under the group operation.
  To be precise: denote by |S| the number of elements of a finite set S. Assume
|A| < |G|^{1-\epsilon} for some \epsilon>0. Then |A\cdot A\cdot
A|>|A|^{1+\delta}, where \delta>0 depends only on \epsilon.
  We also study subsets A\subset G that do not generate G. Other results on
growth and generation follow.


title:
On Krause's multi-agent consensus model with state-dependent
  connectivity (Extended version)

abstract:
  We study a model of opinion dynamics introduced by Krause: each agent has an
opinion represented by a real number, and updates its opinion by averaging all
agent opinions that differ from its own by less than 1. We give a new proof of
convergence into clusters of agents, with all agents in the same cluster
holding the same opinion. We then introduce a particular notion of equilibrium
stability and provide lower bounds on the inter-cluster distances at a stable
equilibrium. To better understand the behavior of the system when the number of
agents is large, we also introduce and study a variant involving a continuum of
agents, obtaining partial convergence results and lower bounds on inter-cluster
distances, under some mild assumptions.


title: Active galactic nuclei in four metal-poor dwarf emission-line galaxies

abstract:
  We present 3.5m Apache Point Observatory second-epoch spectra of four
low-metallicity emission-line dwarf galaxies discovered serendipitously in the
Data Release 5 of the Sloan Digital Sky Survey (SDSS) to have extraordinary
large broad Halpha luminosities, ranging from 3x10^41 to 2x10^42 erg/s. The
oxygen abundance in these galaxies is very low, varying in the range 12+logO/H
= 7.36- 7.99. Such extraordinarily high broad Halpha luminosities cannot be
accounted for by massive stars at different stages of their evolution. By
comparing with the first-epoch SDSS spectra, we find that the broad Halpha
luminosities have remained constant over a period of 3-7 years, which probably
excludes type IIn supernovae as a possible mechanism of broad emission. The
emission most likely comes from accretion disks around intermediate-mass black
holes with lower mass limits in the range ~5x10^5 Msun-3x10^6 Msun. If so,
these four objects form a new class of very low-metallicity AGN that have been
elusive until now. The absence of the strong high-ionization lines [NeV] 3426
and He II 4686 can be understood if the nonthermal radiation contributes less
than ~10% of the total ionizing radiation.


title: Spaces of closed subgroups of locally compact groups

abstract:
  The set $\Cal C(G)$ of closed subgroups of a locally compact group $G$ has a
natural topology which makes it a compact space. This topology has been defined
in various contexts by Vietoris, Chabauty, Fell, Thurston, Gromov, Grigorchuk,
and many others.
  The purpose of the talk was to describe the space $\Cal C(G)$ first for a few
elementary examples, then for $G$ the complex plane, in which case $\Cal C(G)$
is a 4--sphere (a result of Hubbard and Pourezza), and finally for the
3--dimensional Heisenberg group $H$, in which case $\Cal C(H)$ is a
6--dimensional singular space recently investigated by Martin Bridson, Victor
Kleptsyn and the author \cite{BrHK}.
  These are slightly expanded notes prepared for a talk given at several
places: the Kortrijk workshop on {\it Discrete Groups and Geometric Structures,
with Applications III,} May 26--30, 2008; the {\it Tripode 14,} \'Ecole Normale
Sup\'erieure de Lyon, June 13, 2008; and seminars at the EPFL, Lausanne, and in
the Universit\'e de Rennes 1. The notes do not contain any other result than
those in \cite{BrHK}, and are not intended for publication.


title:
Knowledge Acquisition by Networks of Interacting Agents in the Presence
  of Observation Errors

abstract:
  In this work we investigate knowledge acquisition as performed by multiple
agents interacting as they infer, under the presence of observation errors,
respective models of a complex system. We focus the specific case in which, at
each time step, each agent takes into account its current observation as well
as the average of the models of its neighbors. The agents are connected by a
network of interaction of Erd\H{o}s-Renyi or Barabasi-Albert type. First we
investigate situations in which one of the agents has a different probability
of observation error (higher or lower). It is shown that the influence of this
special agent over the quality of the models inferred by the rest of the
network can be substantial, varying linearly with the respective degree of the
agent with different estimation error. In case the degree of this agent is
taken as a respective fitness parameter, the effect of the different estimation
error is even more pronounced, becoming superlinear. To complement our
analysis, we provide the analytical solution of the overall behavior of the
system. We also investigate the knowledge acquisition dynamic when the agents
are grouped into communities. We verify that the inclusion of edges between
agents (within a community) having higher probability of observation error
promotes the loss of quality in the estimation of the agents in the other
communities.


title: Gluinos condensing at the CCNI: 4096 CPUs weigh in

abstract:
  We report preliminary results of lattice super-Yang-Mills computations using
domain wall fermions, performed at an actual rate of 1000 Gflop/s, over the
course of six months, using two BlueGene/L racks at Rensselaer's CCNI
supercomputing center. This has allowed us to compute the gluino condensate and
string tension over a wide range of lattice parameters, setting the stage for
continuum, chiral extrapolations.


title:
Mean parity of single quantum excitation of some optical fields in
  thermal environments

abstract:
  The mean parity (the Wigner function at the origin) of excited binomial
states, excited coherent states and excited thermal states in thermal channel
is investigated in details. It is found that the single-photon excited binomial
state and the single-photon excited coherent state exhibit certain similarity
in the aspect of their mean parity in the thermal channel. We show the negative
mean parity can be regarded as an indicator of nonclassicality of single-photon
excitation of optical fields with a little coherence, especially for the
single-photon excited thermal states.


title: Geometries with intransitive equivalence relation

abstract:
  One considers geometry with the intransitive equaivalence relation. Such a
geometry is a physical geometry, i.e. it is described completely by the world
function, which is a half of the squared distance function. The physical
geometry cannot be axiomatized, in general. It is obtained as a result of
deformation of the proper Euclidean geometry. Class of physical geometries is
more powerful, than the class of axiomatized geometries. The physical geometry
admits one to describe such geometric properties as discreteness, granularity
and limited divisibility. These properties are important in application to the
space-time. They admits one to explain the discrimination properties of the
space-time, which generate discrete parameters of elementary particles.
Mathematical formalism of a physical geometry is very simple. The physical
geometry is formulated in geometrical terms (in terms of points and world
function) without a use of means of description (coordinate system, space
dimension, manifold, etc.).


title: An H-alpha Imaging Survey of Galaxies in the Local 11 Mpc Volume

abstract:
  As part of a broader effort to characterize the population of star-forming
galaxies in the local universe, we have carried out an H-alpha+[NII] imaging
survey for an essentially volume-limited sample of galaxies within 11 Mpc of
the Milky Way. This paper describes the design of the survey, the observation,
data processing, and calibration procedures, and the characteristics of the
galaxy sample. The main product of the paper is a catalog of integrated H-alpha
fluxes, luminosities, and equivalent widths for the galaxies in the sample. We
briefly discuss the completeness properties of the survey and compare the
distribution of the sample and its star formation properties to other large
H-alpha imaging surveys. These data form the foundation for a series of
follow-up studies of the star formation properties of the local volume, and the
properties and duty cycles of star formation bursts in dwarf galaxies.


title:
Chiral spin states in the pyrochlore Heisenberg magnet: Fermionic
  mean-field theory and variational Monte Carlo calculations

abstract:
  Fermionic mean-field theory and variational Monte Carlo calculations are
employed to shed light on the possible uniform ground states of the Heisenberg
model on the pyrochlore lattice. Among the various flux configurations, we find
the chiral spin states carrying \pm pi/2 flux through each triangular face to
be the most stable both within the mean-field theory and the projected
wave-function studies. Properties of the spin-spin correlation function and the
chirality order parameter are calculated for the projected wave functions.
Mean-field band structures are examined.


title: Identification of the ECR zone in the SWISSCASE ECR ion source

abstract:
  The magnetic field of the permanent magnet electron cyclotron resonance (ECR)
ion source SWISSCASE located at the University of Bern has been numerically
simulated and experimentally investigated. For the first time the magnetized
volume qualified for electron cyclotron resonance at 10.88 GHz and 388.6 mT has
been analyzed in highly detailed 3D simulations with unprecedented resolution.
The observed pattern of carbon coatings on the source correlates strongly with
the electron and ion distribution in the ECR plasma of SWISSCASE. Under certain
plasma conditions the ion distribution is tightly bound to the electron
distribution and can considerably simplify the numerical calculations in ECR
related applications such as ECR ion engines and ECR ion implanters.


title: On the Threshold of New Physics?

abstract:
  In May 2008 the long awaited NASA Satellite, GLAST was launched, which will
study cosmic gamma rays. In August 2008, it is expected that the CERN's Large
Hadron Collidor (LHC) will finally become operationized. This is found to
unwield several new particles. All this has the potential of opening the
frontier of a New Physics.


title: Bloch-Wigner theorem over rings with many units

abstract:
  The purpose of this article is to provide a version of Bloch-Wigner theorem
over the class of rings with many units.


title: Sparse random graphs with clustering

abstract:
  In 2007 we introduced a general model of sparse random graphs with
independence between the edges. The aim of this paper is to present an
extension of this model in which the edges are far from independent, and to
prove several results about this extension. The basic idea is to construct the
random graph by adding not only edges but also other small graphs. In other
words, we first construct an inhomogeneous random hypergraph with independent
hyperedges, and then replace each hyperedge by a (perhaps complete) graph.
Although flexible enough to produce graphs with significant dependence between
edges, this model is nonetheless mathematically tractable. Indeed, we find the
critical point where a giant component emerges in full generality, in terms of
the norm of a certain integral operator, and relate the size of the giant
component to the survival probability of a certain (non-Poisson) multi-type
branching process. While our main focus is the phase transition, we also study
the degree distribution and the numbers of small subgraphs. We illustrate the
model with a simple special case that produces graphs with power-law degree
sequences with a wide range of degree exponents and clustering coefficients.


title: Bell's Theorem and the Causal Arrow of Time

abstract:
  Einstein held that the formalism of Quantum Mechanics (QM) entails "spooky
actions at a distance". Indeed, in the 60's Bell showed that the predictions of
QM disagree with the results of any locally causal description. Accepting
non-local descriptions while retaining causality leads to a clash with the
theory of relativity. Furthermore, the causal arrow of time by definition
contradicts time-reversal symmetry. For these reasons, some authors (Feynman
and Wheeler, Costa de Beauregard, Cramer, Price) have advocated abandoning
microscopic causality. In the present article, a simplistic but concrete
example of following this line of thought is presented, in the form of a
retro-causal toy-model which is stochastic and which provides an appealing
description of the specific quantum correlations discussed by Bell. One
concludes that Einstein's "spooky actions" may occur "in the past" rather than
"at a distance", resolving the tension between QM and relativity, and opening
unexplored possibilities for future reformulations of QM.


title: Resonant Phenomena in Antihydrogen-Hydrogen Scattering

abstract:
  We present a treatment of cold hydrogen-antihydrogen collisions based on the
asymptotic properties of atom-antiatom interactions. We derive general formulas
for the elastic and inelastic cross sections and for the scattering lengths and
analyze their sensitivity to the parameters characterizing the inelasticity of
the collision process. Given the inelasticity, we obtain bounds for the complex
scattering length. We investigate the influence of strong nuclear forces and
the isotope effects in $\bar{\rm H}{\rm H}$ and $\bar{\rm H}{\rm D}$ collisions
and demonstrate enhancement of these effects due to the presence of the
near-threshold narrow ${\rm H}\bar{\rm H}$ ($\bar{\rm H}{\rm D}$) states. The
values of the elastic and inelastic cross-sections with simultaneous account of
rearrangement and strong forces are presented. General expressions for the
(complex) energies of the near-threshold $\rm{H}\bar{\rm H}$ states are
obtained.


title: Intrusion Detection Using Cost-Sensitive Classification

abstract:
  Intrusion Detection is an invaluable part of computer networks defense. An
important consideration is the fact that raising false alarms carries a
significantly lower cost than not detecting at- tacks. For this reason, we
examine how cost-sensitive classification methods can be used in Intrusion
Detection systems. The performance of the approach is evaluated under different
experimental conditions, cost matrices and different classification models, in
terms of expected cost, as well as detection and false alarm rates. We find
that even under unfavourable conditions, cost-sensitive classification can
improve performance significantly, if only slightly.


title: Towards the generalized Shapiro and Shapiro conjecture

abstract:
  We find a new, asymptotically better, bound $g\le\frac14d^2+O(d)$ on the
genus of a curve that may violate the generalized total reality conjecture. The
bound covers all known cases except $g=0$ (the original conjecture).


title:
Using the etalon effect for in-situ balancing of the Advanced Virgo arm
  cavities

abstract:
  Several large-scale interferometric gravitational-wave detectors use resonant
arm cavities to enhance the light power in the interferometer arms. These
cavities are based on different optical designs: One design uses wedged input
mirrors to create additional optical pick-off ports for deriving control
signals. The second design employs input mirrors without wedge and thus offers
the possibility to use the etalon effect inside the input mirrors for tuning
the finesse of the arm cavities. In this article we introduce a concept of
maximized flexibility that combines both of these options, by featuring wedges
at the input mirrors and using the etalon effect instead in the end mirrors. We
present a design for the arm cavities of Advanced Virgo. We have used numerical
simulations to derive requirements for the manufacturing accuracy of an end
mirror etalon for Advanced Virgo. Furthermore, we give analytical
approximations for the achievable tuning range of the etalon in dependence on
the reflectance, the curvature and the orientation of the etalon back surface.


title: Balanced split sets and Hamilton-Jacobi equations

abstract:
  We study the singular locus of solutions to Hamilton-Jacobi equations with a
Hamiltonian independent of $u$. In a previous paper, we proved that the
singular locus is what we call a balanced split locus. In this paper, we find
and classify all balanced split sets, identifying the cases where the only
balanced split locus is the singular locus, and the cases where this doesn't
hold. This clarifies the relationship between viscosity solutions and the more
classical approach of characteristics and shocks.


title:
The Five Points Pose Problem : A New and Accurate Solution Adapted to
  any Geometric Configuration

abstract:
  The goal of this paper is to estimate directly the rotation and translation
between two stereoscopic images with the help of five homologous points. The
methodology presented does not mix the rotation and translation parameters,
which is comparably an important advantage over the methods using the
well-known essential matrix. This results in correct behavior and accuracy for
situations otherwise known as quite unfavorable, such as planar scenes, or
panoramic sets of images (with a null base length), while providing quite
comparable results for more "standard" cases. The resolution of the algebraic
polynomials resulting from the modeling of the coplanarity constraint is made
with the help of powerful algebraic solver tools (the Groebner bases and the
Rational Univariate Representation).


title: Topological Transition in a Non-Hermitian Quantum Walk

abstract:
  We analyze a quantum walk on a bipartite one-dimensional lattice, in which
the particle can decay whenever it visits one of the two sublattices. The
corresponding non-Hermitian tight-binding problem with a complex potential for
the decaying sites exhibits two different phases, distinguished by a winding
number defined in terms of the Bloch eigenstates in the Brillouin zone. We find
that the mean displacement of a particle initially localized on one of the
non-decaying sites can be expressed in terms of the winding number, and is
therefore quantized as an integer, changing from zero to one at the critical
point. This problem can serve as a simplified model for nuclear spin pumping in
the spin-blockaded electron transport regime of quantum dots in the presence of
competing hyperfine and spin-orbital interactions. The predicted transition
from pumping to non-pumping is topological in nature, and is hence robust
against certain types of noise and decoherence.


title:
Intrusion Detection in Mobile Ad Hoc Networks Using Classification
  Algorithms

abstract:
  In this paper we present the design and evaluation of intrusion detection
models for MANETs using supervised classification algorithms. Specifically, we
evaluate the performance of the MultiLayer Perceptron (MLP), the Linear
classifier, the Gaussian Mixture Model (GMM), the Naive Bayes classifier and
the Support Vector Machine (SVM). The performance of the classification
algorithms is evaluated under different traffic conditions and mobility
patterns for the Black Hole, Forging, Packet Dropping, and Flooding attacks.
The results indicate that Support Vector Machines exhibit high accuracy for
almost all simulated attacks and that Packet Dropping is the hardest attack to
detect.


title: Introduction to Photon 2007

abstract:
  The introductory remarks to the conference Photon 2007 organized at the
Sorbonne in Paris in July 2007 are presented.


title: Electrically charged gravastar configurations

abstract:
  The notion of a compact object immune to the horizon problem and comprising
an anisotropic inhomogeneous fluid with a specific radial pressure behavior,
i.e. the gravastar, is extended by introducing an electrically charged
component. Einstein-Maxwell field equations are solved in the asymptotically de
Sitter interior where a source of the electric field is coupled to the fluid
energy density. Two different solutions which satisfy the dominant energy
condition are given: one is the delta-shell model for which the analysis is
carried out within Israel's thin shell formalism, the other approach - the
continuous profile model - is solved numerically and the interior solutions
have been (smoothly) joined with the Reissner-Nordstrom exterior. The effect of
electric charge is considered, and the equation of state, the speed of sound
and the surface redshift are calculated for both models.


title: Approximation of subharmonic functions

abstract:
  In certain classes of subharmonic functions u on C distinguished in terms of
lower bounds for the Riesz measure of u, a sharp estimate is obtained for the
rate of approximation by functions of the form log |f(z)|, where f is an entire
function. The results complement and generalize those recently obtained by Yu.
Lyubarskii and Eu. Malinnikova.


title:
Towards an Effective Intrusion Response Engine Combined with Intrusion
  Detection in Ad Hoc Networks

abstract:
  In this paper, we present an effective intrusion response engine combined
with intrusion detection in ad hoc networks. The intrusion response engine is
composed of a secure communication module, a local and a global response
module. Its function is based on an innovative tree-based key agreement
protocol while the intrusion detection engine is based on a class of neural
networks called eSOM. The proposed intrusion response model and the tree-based
protocol, it is based on, are analyzed concerning key secrecy while the
intrusion detection engine is evaluated for MANET under different traffic
conditions and mobility patterns. The results show a high detection rate for
packet dropping attacks.


title: An extremal problem for a class of entire functions of exponential type

abstract:
  We find the exact upper estimate for the upper density of zeros of entire
functions of exponential type whose indicator diagram is contained in a given
interval.


title: Quantum cosmic models and thermodynamics

abstract:
  The current accelerating phase of the evolution of the universe is considered
by constructing most economical cosmic models that use just general relativity
and some dominating quantum effects associated with the probabilistic
description of quantum physics. Two of such models are explicitly analyzed.
They are based on the existence of a sub-quantum potential and correspond to a
generalization of the spatially flat exponential model of de Sitter space. The
thermodynamics of these two cosmic solutions is discussed, using the second
principle as a guide to choose which among the two is more feasible. The paper
also discusses the relativistic physics on which the models are based, their
holographic description, some implications from the classical energy
conditions, and an interpretation of dark energy in terms of the entangled
energy of the universe.


title:
A Spitzer Study of Debris Disks In The Young Nearby Cluster NGC 2232:
  Icy Planets Are Common Around ~ 1.5--3 Solar-Mass Stars

abstract:
  We describe Spitzer IRAC and MIPS observations of the nearby 25 Myr-old open
cluster NGC 2232. Combining these data with ROSAT All-Sky Survey observations,
proper motions, and optical photometry/spectroscopy, we construct a list of
highly probable cluster members. We identify 1 A-type star, HD 45435, with
definite excess emission at 4.5--24 micron indicative of debris from
terrestrial planet formation. We also identify 2--4 late-type stars with
possible 8 micron excesses, and 8 early-type stars with definite 24 micron
excesses. Constraints on the dust luminosity and temperature suggest that the
detected excesses are produced by debris disks. From our sample of B and A
stars, stellar rotation appears correlated with 24 micron excess, a result
expected if massive primordial disks evolve into massive debris disks. To
explore the evolution of the frequency and magnitude of debris around A-type
stars, we combine our results with data for other young clusters. The frequency
of debris disks around A-type stars appears to increase from ~ 25% at 5 Myr to
~ 50--60% at 20--25 Myr. Older A-type stars have smaller debris disk
frequencies: ~ 20% at 50--100 Myr. For these ages, the typical level of debris
emission rises from 5--20 Myr and then declines. Because 24 micron dust
emission probes icy planet formation around A-type stars, our results suggest
that the frequency of icy planet formation is eta(i) > 0.5--0.6. Thus, most
A-type stars (approx. 1.5--3 Msun) produce icy planets.


title:
Reddenings of FGK supergiants and classical Cepheids from spectroscopic
  data

abstract:
  Accurate and homogeneous atmospheric parameters (Teff, log (g), Vt, [Fe/H])
are derived for 74 FGK non-variable supergiants from high-resolution, high
signal-to-noise ratio, echelle spectra. Extremely high precision for the
inferred effective temperatures (10-40 K) is achieved by using the line-depth
ratio method. The new data are combined with atmospheric values for 164
classical Cepheids, observed at 675 different pulsation phases, taken from our
previously published studies. The derived values are correlated with unreddened
B-V colours compiled from the literature for the investigated stars in order to
obtain an empirical relationship of the form: (B-V)o = 57.984 - 10.3587(log
Teff)^2 + 1.67572(log Teff)^3 - 3.356(log (g)) + 0.0321(Vt) + 0.2615[Fe/H] +
0.8833((log (g))(log Teff)). The expression is used to estimate colour excesses
E(B-V) for individual supergiants and classical Cepheids, with a precision of
+-0.05 mag. for supergiants and Cepheids with n=1-2 spectra, reaching +-0.025
mag. for Cepheids with n>2 spectra, matching uncertainties for the most
sophisticated photometric techniques. The reddening scale is also a close match
to the system of space reddenings for Cepheids. The application range is for
spectral types F0--K0 and luminosity classes I and II.


title: About Some Quadratic Scalar Curvatures and the $h_{4}$ Yamabe Equation

abstract:
  This is a paper based on a talk given at the conference on Conformal Geometry
which held at Roscoff in France in the 2008 summer. We study some aspects of
the equation arising from the problem of the existence on a given closed
Riemannian manifold of dimension at leat 4, of a conformal metric with constant
$h_4$ curvature. We establish a simple formula relating the second Gauss-Bonnet
curvature $h_4$ to the $\sigma_2$ curvature and we study some positivity
properties of these two quadratic curvatures. We use different quadratic
curvatures to characterize space forms, Einstein metrics and conformally flat
metrics. In the appendix we introduce natural generalizations of Newton
transformations, the corresponding Newton identities are used to obtain Avez
type formulas for all the Gauss-Bonnet curvatures.


title:
A Systematic Analysis of Fe II Emission in Quasars: Evidence for Inflow
  to the Central Black Hole

abstract:
  Broad Fe II emission is a prominent feature of the optical and ultraviolet
spectra of quasars. We report on a systematical investigation of optical Fe II
emission in a large sample of 4037 z < 0.8 quasars selected from the Sloan
Digital Sky Survey. We have developed and tested a detailed line-fitting
technique, taking into account the complex continuum and narrow and broad
emission-line spectrum. Our primary goal is to quantify the velocity broadening
and velocity shift of the Fe II spectrum in order to constrain the location of
the Fe II-emitting region and its relation to the broad-line region. We find
that the majority of quasars show Fe II emission that is redshifted, typically
by ~ 400 km/s but up to 2000 km/s, with respect to the systemic velocity of the
narrow-line region or of the conventional broad-line region as traced by the
Hbeta line. Moreover, the line width of Fe II is significantly narrower than
that of the broad component of Hbeta. We show that the magnitude of the Fe II
redshift correlates inversely with the Eddington ratio, and that there is a
tendency for sources with redshifted Fe II emission to show red asymmetry in
the Hbeta line. These characteristics strongly suggest that Fe II originates
from a location different from, and most likely exterior to, the region that
produces most of Hbeta. The Fe II-emitting zone traces a portion of the
broad-line region of intermediate velocities whose dynamics may be dominated by
infall.


title: Hbeta Profiles in Quasars: Evidence for an Intermediate-line Region

abstract:
  We report on a systematic investigation of the Hbeta and Fe II emission lines
in a sample of 568 quasars within z < 0.8 selected from the Sloan Digital Sky
Survey. The conventional broad Hbeta emission line can be decomposed into two
components--one with intermediate velocity width and another with very broad
width. The velocity shift and equivalent width of the intermediate-width
component do not correlate with those of the very broad component of Hbeta, but
its velocity shift and width do resemble Fe II. Moreover, the width of the very
broad component is roughly 2.5 times that of the intermediate-width component.
These characteristics strongly suggest the existence of an intermediate-line
region, whose kinematics seem to be dominated by infall, located at the outer
portion of the broad-line region.


title:
Learning of Content Knowledge and Development of Scientific Reasoning
  Ability: A Cross Culture Comparison

abstract:
  Student content knowledge and general reasoning abilities are two important
areas in education practice and research. However, there hasn't been much work
in physics education that clearly documents the possible interactions between
content learning and the development of general reasoning abilities. In this
paper, we report one study of a systematic research to investigate the possible
interactions between students' learning of physics content knowledge and the
development of general scientific reasoning abilities. Specifically, this study
seeks to answer the research question of whether and to what extent content
learning may affect the development of general reasoning abilities. College
entrance testing data of freshman college students in both USA and China were
collected using three standardized tests, FCI, BEMA, and Lawson's Classroom
Test of Scientific Reasoning (Lawson Test). The results suggest that years of
rigorous training of physics knowledge in middle and high schools have made
significant impact on Chinese students' ability in solving physics problems,
while such training doesn't seem to have direct effects on their general
ability in scientific reasoning, which was measured to be at the same level as
that of the students in USA. Details of the curriculum structures in the
education systems of USA and China are also compared to provide a basis for
interpreting the assessment data.


title: Cycle Space Constructions for Exhaustions of Flag Domains

abstract:
  In the study of complex flag manifolds, flag domains and their cycle spaces,
a key point is the fact that the cycle space $\mathcal M_D$ of a flag domain
$D$ is a Stein manifold. That fact has a long history. The earliest approach
relied on construction of a strictly plurisubharmonic function on $\mathcal
M_D$, starting with a $q$--convex exhaustion function on $D$, where $q$ is the
dimension of a particular maximal compact subvariety of $D$ (we use the
normalization that 0--convex means Stein). Construction of that exhaustion
function on $D$ required that $D$ be measurable. In that case the exhaustion on
$D$ was transferred to $\mathcal M_D$, using a special case of a method due to
Barlet. Here we do the opposite: we use an incidence method to construct a
canonical plurisubharmonic exhaustion function on $\mathcal M_D$ and use it in
turn to construct a canonical $q$--convex exhaustion function on $D$. This
promises to have strong consequences for cohomology vanishing theorems and the
construction of admissible representations of real reductive Lie groups.


title: Integrable Spin Chain in Superconformal Chern-Simons Theory

abstract:
  N = 6 superconformal Chern-Simons theory was proposed as gauge theory dual to
Type IIA string theory on AdS4*CP3. We study integrability of the theory from
conformal dimension spectrum of single trace operators at planar limit. At
strong `t Hooft coupling, the spectrum is obtained from excitation energy of
free superstring on OSp(6|2,2)/SO(3,1)xSU(3)xU(1) supercoset. We recall that
the worldsheet theory is integrable classically by utilizing well-known results
concerning sigma model on symmetric space. With R-symmetry group SU(4), we also
solve relevant Yang-Baxter equation for a spin chain system associated with the
single trace operators. From the solution, we construct alternating spin chain
Hamiltonian involving three-site interactions between 4 and 4*. At weak `t
Hooft coupling, we study gauge theory perturbatively, and calculate action of
dilatation operator to single trace operators up to two loops. To ensure
consistency, we computed all relevant Feynman diagrams contributing to the
dilatation opeator. We find that resulting spin chain Hamiltonian matches with
the Hamiltonian derived from Yang-Baxter equation. We further study new issues
arising from the shortest gauge invariant operators transforming as 15 and 1
under SU(4). We observe that `wrapping interactions' are present, compute the
true spectrum and find that the spectrum agrees with prediction from
supersymmetry. We also find that scaling dimension computed naively from
alternating spin chain Hamiltonian coincides with the true spectrum. We solve
Bethe ansatz equations for small number of excitations, and find indications of
correlation between excitations of 4's and 4*'s and of nonexistence of mesonic
(4 4*) bound-state.


title:
High-Resolution Studies of the Multiple-Core Systems toward
  Cluster-Forming Regions Including Massive Stars

abstract:
  We present the results of C18O observations by the Nobeyama Millimeter Array
toward dense clumps with radii of ~ 0.3 pc in six cluster-forming regions
including massive (proto)stars. We identified 171 cores, whose radius, line
width, and molecular mass range from 0.01 to 0.09 pc, 0.43 to 3.33 km/s, and
0.5 to 54.1 Mo, respectively. Many cores with various line widths exist in one
clump, and the index of the line width-radius relationship of the cores and the
parental clump differs from core to core in the clump. This indicates that the
degree of dissipation of the turbulent motion varies for each core in one
clump. Although the mass of the cores increases with the line width, most cores
are gravitationally bound by the external pressure. In addition, the line width
and the external pressure of the cores tend to decrease with the distance from
the center of the clump, and these dependencies may be caused by the inner H2
density structure of the clump that affects the physical properties of the
cores. Moreover, the number density of the cores and the number density of
young (proto)stars have a similar relationship to the average H2 density of the
clumps. Thus, our findings suggest that the cluster is formed in the clump
through the formation of such multiple cores, whose physical properties would
have been strongly related to the H2 density structure and the turbulent motion
of the clump.


title:
Dynamics with Infinitely Many Time Derivatives in
  Friedmann-Robertson-Walker Background and Rolling Tachyon

abstract:
  Open string field theory in the level truncation approximation is considered.
It is shown that the energy conservation law determines existence of rolling
tachyon solution. The coupling of the open string field theory action to a
Friedmann-Robertson-Walker metric is considered which leads to a new time
dependent rolling tachyon solution is presented and possible cosmological
consequences are discussed.


title: Gauge Fields in Causal Set Theory

abstract:
  This is the second paper in a series on the dynamics of matter fields in the
causal set approach to quantum gravity. We start with the usual expression for
the Lagrangian of a charged scalar field coupled to a SU(n) Yang-Mills field,
in which the gauge field is represented by a connection form, and show how to
write it in terms of holonomies between pairs of points, causal relations, and
volumes or timelike distances, all of which have a natural correspondence in
the causal set context. In the second part of the paper we present an
alternative model, in which the gauge field appears as the result of a
procedure inspired by the Kaluza-Klein reduction in continuum field theory, and
the dynamics can be derived simply using the gravitational Lagrangian of the
theory.


title: New insights into the nature of the peculiar star theta Carinae

abstract:
  We acquired high resolution spectroscopic and low resolution
spectropolarimetric observations to achieve the following goals: a) to improve
the orbital parameters to allow a more in-depth discussion on the possibility
of mass transfer in the binary system, b) to carry out a non-local
thermodynamic equilibrium (NLTE) abundance analysis, and c) to search for the
presence of a magnetic field.
  The study of the radial velocities using CORALIE spectra allowed us to
significantly improve the orbital parameters. A comparative NLTE abundance
analysis was undertaken for theta Car and two other early B-type stars with
recently detected magnetic fields, tau Sco and xi^1 CMa. The analysis revealed
significantly different abundance patterns: a one-order-of-magnitude nitrogen
overabundance and carbon depletion was found in theta Car, while the oxygen
abundance is roughly solar. For the stars xi^1 CMa and tau Sco the carbon
abundance is solar and, while an N excess is also detected, it is of much
smaller amplitude (0.4-0.6dex). Such an N overabundance is typical of the
values already found for other slowly-rotating (magnetic) B-type dwarfs. For
theta Car, we attribute instead the chemical peculiarities to a past episode of
mass transfer between the two binary components. The results of the search for
a magnetic field using FORS1 at the VLT consisting of 26 measurements over a
time span of ~1.2h are rather inconclusive: only few measurements have a
significance level of 3sigma. Although we detect a periodicity of the order of
~8.8min in the dataset involving the measurements on all hydrogen Balmer lines
with the exception of the Halpha and Hbeta lines, these results have to be
confirmed by additional time-resolved magnetic field observations.


title:
QTPIE: Charge Transfer with Polarization Current Equalization. A
  fluctuating charge model with correct asymptotics

abstract:
  Polarization and charge transfer are important effects which are difficult to
describe using conventional force fields. Charge equilibration models can
include both of these effects in large-scale molecular simulations. However,
these models behave incorrectly when bonds are broken, making it difficult to
use them in the context of reactive force fields. We develop a new method for
describing charge flow in molecules -- QTPIE. The QTPIE method is based on
charge transfer variables (as opposed to atomic charges) and correctly treats
asymptotic behavior near dissociation. It is also able to provide a realistic
description of in-plane polarizabilities.


title:
Measures on Banach Manifolds, Random Surfaces, and Nonperturbative
  String Field Theory with Cut-offs

abstract:
  We construct a cut-off version of nonpertubative closed Bosonic string field
theory in the light-cone gauge with imaginary string coupling constant. We show
that the partition function is a continuous function of the string coupling
constant, and conjecture a relation between the formal power series expansion
of this partition function and Riemann Surfaces.


title: Analytical solution for inviscid flow inside an evaporating sessile drop

abstract:
  Inviscid flow within an evaporating sessile drop is analyzed. The field
equation, E^2(Psi)=0, is solved for the stream function. The exact analytical
solution is obtained for arbitrary contact angle and distribution of
evaporative flux along the free boundary. Specific results and computations are
presented for evaporation corresponding to both uniform flux and purely
diffusive gas phase transport into an infinite ambient. Wetting and non-wetting
contact angles are considered with flow patterns in each case being
illustrated. The limiting behaviors of small contact angle and droplets of
hemispherical shape are treated. All of the above categories are considered for
the cases of droplets whose contact lines are either pinned or free to move
during evaporation.


title:
Analytical solution of Stokes flow inside an evaporating sessile drop:
  Spherical and cylindrical cap shapes

abstract:
  Exact analytical solutions are derived for the Stokes flows within
evaporating sessile drops of spherical and cylindrical cap shapes. The results
are valid for arbitrary contact angle. Solutions are obtained for arbitrary
evaporative flux distributions along the free surface as long as the flux is
bounded at the contact line. The field equations, E^4(Psi)=0 and Del^4(Phi)=0,
are solved for the spherical and cylindrical cap cases, respectively. Specific
results and computations are presented for evaporation corresponding to uniform
flux and to purely diffusive gas phase transport into an infinite ambient.
Wetting and non-wetting contact angles are considered with the flow patterns in
each case being illustrated. For the spherical cap with evaporation controlled
by vapor phase diffusion, when the contact angle lies in the range
0<theta_c<pi, the mass flux of vapor becomes singular at the contact line. This
condition required modification when solving for the liquid phase transport.
Droplets in all of the above categories are considered for the following two
cases: the contact lines are either pinned or free to move during evaporation.
The present viscous flow behavior is compared to the inviscid flow behavior
previously reported. It is seen that the streamlines for viscous flow lie
farther from the substrate than the corresponding inviscid ones.


title: On the tensor structure of BRST differential and it's application

abstract:
  In this paper,we compute tensor structure of BRST differential and use this
tensor representation we give out $CL_{\infty}$ algebra differential and
$GA_{\infty}$ differential which are generalization of Chevalley-Eilenberg
differential and Hochchild differential respectively.


title:
Problems in Additive Number Theory, III: Thematic Seminars at the Centre
  de Recerca Matematica

abstract:
  This is a survey of open problems in different parts of combinatorial and
additive number theory. The paper is based on lectures at the Centre de Recerca
Matematica in Barcelona on January 23 and January 25, 2008.


title: M2-M5 Systems in N=6 Chern-Simons Theory

abstract:
  We study two aspects of M5-branes in N=6 U(N)xU(N) Chern-Simons gauge theory.
We first examine multiple M2-branes ending on a M5-brane. We study Basu-Harvey
type cubic equations, fuzzy funnel configurations, and derive the M5-brane
tension from the N=6 theory. We also find a limit in which the above M2-M5
system reduces to a D2-D4 system and we recover the Nahm equation from the N=6
theory. We then examine domain wall configurations in mass-deformed N=6 theory
with a manifest SU(2)xSU(2)xU(1) global symmetry. We derive tensions of domain
walls connecting between arbitrary M5-brane vacua of the deformed theory and
observe their consistency with gravity dual expectations.


title:
Reflected Backward Stochastic Differential Equations with Continuous
  Coefficient and L^2 Barriers

abstract:
  In this paper we study reflected backward stochastic differential equations
with a continuous, linear growth coefficient and two barriers which belong to
L^2. We prove that there exists at least by penalization method.


title:
Reflected Backward Stochastic Differential Equations Driven by L\'{e}vy
  Process

abstract:
  In this paper, we deal with a class of reflected backward stochastic
differential equations associated to the subdifferential operator of a lower
semi-continuous convex function driven by Teugels martingales associated with
L\'{e}vy process. We obtain the existence and uniqueness of solutions to these
equations by means of the penalization method. As its application, we give a
probabilistic interpretation for the solutions of a class of partial
differential-integral inclusions.


title:
Nonexistence of arithmetic fake compact hermitian symmetric spaces of
  types other than An

abstract:
  We show that there are no arithmetic fake compact hermitian symmetric spaces
of type other than An for n>4.


title: Family name distributions: Master equation approach

abstract:
  Although cumulative family name distributions in many countries exhibit
power-law forms, there also exist counterexamples. The origin of different
family name distributions across countries is discussed analytically in the
framework of a population dynamics model. Combined with empirical observations
made, it is suggested that those differences in distributions are closely
related with the rate of appearance of new family names.


title: Zeros of p-adic forms

abstract:
  We show that all $p$-adic quintic forms in at least $n>4562911$ variables
have a non-trivial zero. We also derive new result concerning systems of cubic
and quadratic forms.


title: Entanglement-assisted Coding Theory

abstract:
  In this dissertation, I present a general method for studying quantum error
correction codes (QECCs). This method not only provides us an intuitive way of
understanding QECCs, but also leads to several extensions of standard QECCs,
including the operator quantum error correction (OQECC), the
entanglement-assisted quantum error correction (EAQECC). Furthermore, we can
combine both OQECC and EAQECC into a unified formalism, the
entanglement-assisted operator formalism. This provides great flexibility of
designing QECCs for different applications. Finally, I show that the
performance of quantum low-density parity-check codes will be largely improved
using entanglement-assisted formalism.


title: Wave Function and Pair Distribution Function of a Dilute Bose Gas

abstract:
  The wave function of a dilute hard sphere Bose gas at low temperatures is
discussed, emphasizing the formation of pairs. The pair distribution function
is calculated for two values of $\sqrt{\rho a^3}$.


title: Korean Family Name Distribution in the Past

abstract:
  We empirically study the genealogical trees of ten families for about five
centuries in Korea. Although each family tree contains only the paternal part,
the family names of women married to the family have been recorded, which
allows us to estimate roughly the family name distributions for the past five
hundred years. Revealed is the fact that the unique Korean family name
distribution, characterized by a logarithmic form of the cumulative
distribution and an exponentially decaying rank-size plot often called the Zipf
plot, has remained unchanged for a long time. We discuss the implications of
our results within a recently suggested theoretical model and compare them with
observations in other countries in which power-law forms are abundantly found.


title: Market dynamics after large financial crash

abstract:
  The model describing market dynamics after a large financial crash is
considered in terms of the stochastic differential equation of Ito. Physically,
the model presents an overdamped Brownian particle moving in the nonstationary
one-dimensional potential $U$ under the influence of the variable noise
intensity, depending on the particle position $x$. Based on the empirical data
the approximate estimation of the Kramers-Moyal coefficients $D_{1,2}$ allow to
predicate quite definitely the behavior of the potential introduced by $D_1 = -
\partial U /\partial x$ and the volatility $\sim \sqrt{D_2}$. It has been shown
that the presented model describes well enough the best known empirical facts
relative to the large financial crash of October 1987. \


title: Ruled Lagrangian Submanifolds of the 6-Sphere

abstract:
  This article sets out to serve a dual purpose. On the one hand, we give an
explicit description of the Lagrangian submanifolds of the nearly Kaehler
6-sphere which are ruled by circles of constant radius using Weierstrass
formulae. On the other, we recognise all previous known examples of these
Lagrangians as being ruled by such circles. Therefore, we describe all families
of Lagrangians in the 6-sphere whose second fundamental form satisfies natural
pointwise conditions: so-called second order families.


title:
An improved approximation to l-wave bound states of the Manning-Rosen
  potential by Nikiforov-Uvarov method

abstract:
  A new approximation scheme to the centrifugal term is proposed to obtain the
$l\neq 0$ solutions of the Schr\"{o}dinger equation with the Manning-Rosen
potential. We also find the corresponding normalized wave functions in terms of
the Jacobi polynomials. To show the accuracy of the new approximation scheme,
we calculate the energy eigenvalues numerically for arbitrary quantum numbers
$n$ and $l$ with two different values of the potential parameter $\alpha .$ The
bound state energies of various states for a few $% HCl,$ $CH,$ $LiH$ and $CO$
diatomic molecules are also calculated. The numerical results are in good
agreement with those obtained by using program based on a numerical integration
procedure. Our solution can be also reduced to the s-wave ($l=0$) case and to
the Hulth\'{e}n potential case.


title: Advances in Gaseous Photomultipliers

abstract:
  We review latest progress in gaseous photomultipliers (GPM) combining solid
photocathodes and various types of novel electron multipliers. Cascaded gaseous
electron multipliers (GEM) coated with CsI photocathodes can efficiently
replace UVsensitive wire chambers for single-photon recording in Cherenkov and
other detectors. Other hole-multipliers with patterned electrodes (Micro-Hole
and Strip Plates) and improved ion-blocking properties are discussed; these
permit reducing considerably photon- and ion-induced secondary effects. Photon
detectors with other electron-multiplier techniques are briefly described,
among them GPMs based on Micromegas, capillary-plates, Thick-GEMs and resistive
Thick GEMs. The two latter techniques, robust and economically produced, are
particularly suited for large-area GPM applications, e.g. in RICH. Cascaded
hole-multipliers with very high ion-blocking performance permitted the
development and the first demonstration of DC-operated visible-sensitive
gaseous photomultipliers with bialkali photocathodes and single-photon
sensitivity. Recent progress is described in GPMs operated at cryogenic
temperatures for rare-event noble-liquid detectors and medical imaging.


title:
Exact Solution of a Yang-Baxter Spin-1/2 Chain Model and Quantum
  Entanglement

abstract:
  Entanglement is believed to be crucial in macroscopic physical systems for
understanding the collective quantum phenomena such as quantum phase
transitions. We start from and solve exactly a novel Yang-Baxter spin-1/2 chain
model with inhomogeneous and anisotropic short-range interactions. For the
ground state, we show the behavior of neighboring entanglement in the parameter
space and find that the inhomogeneous coupling strengths affect entanglement in
a distinctive way from the homogeneous case, but this would not affect the
coincidence between entanglement and quantum criticality.


title: A high frequency search for radio pulsars in EGRET error boxes

abstract:
  We present a new survey for pulsars in the error boxes of the low-latitude
EGRET sources 3EG J1027-5817, 3EG J1800-2338 and 3EG J1810-1032. Although all
of these sources have been covered by previous pulsar surveys, the recent
discovery of the young, energetic pulsar PSR J1410-6132 at 6.7 GHz has shown
that pulsars of this type can be hidden from low frequency surveys. Using an
observing frequency of 3.1 GHz we discovered a 91-ms pulsar, PSR J1028-5819,
which observations made at the Parkes telescope and the Australia Telescope
Compact Array have shown to be young and energetic. We believe this pulsar is
likely to be powering the unidentified EGRET source 3EG J1027-5817. Like other
energetic pulsars, PSR J1028-5819 is highly linearly polarised, but
astonishingly has a pulse duty cycle of only 0.4%, one of the smallest in the
entire pulsar catalogue.