title: $^{10}$Li spectrum from $^{11}$Li fragmentation

abstract:
  A recently developed time dependent model for the excitation of a nucleon
from a bound state to a continuum resonant state in the system n+core is
applied to the study of the population of the low energy continuum of the
unbound $^{10}$Li system obtained from $^{11}$Li fragmentation. Comparison of
the model results to new data from the GSI laboratory suggests that the
reaction mechanism is dominated by final state effects rather than by the
sudden process, but for the population of the l=0 virtual state, in which case
the two mechanisms give almost identical results. There is also, for the first
time, a clear evidence for the population of a d$_{5/2}$ resonance in
$^{10}$Li.


title: Asymptotics of the Euler number of bipartite graphs

abstract:
  We define the Euler number of a bipartite graph on $n$ vertices to be the
number of labelings of the vertices with $1,2,...,n$ such that the vertices
alternate in being local maxima and local minima. We reformulate the problem of
computing the Euler number of certain subgraphs of the Cartesian product of a
graph $G$ with the path $P_m$ in terms of self adjoint operators. The
asymptotic expansion of the Euler number is given in terms of the eigenvalues
of the associated operator. For two classes of graphs, the comb graphs and the
Cartesian product $P_2 \Box P_m$, we numerically solve the eigenvalue problem.


title: Unicast and Multicast Qos Routing with Soft Constraint Logic Programming

abstract:
  We present a formal model to represent and solve the unicast/multicast
routing problem in networks with Quality of Service (QoS) requirements. To
attain this, first we translate the network adapting it to a weighted graph
(unicast) or and-or graph (multicast), where the weight on a connector
corresponds to the multidimensional cost of sending a packet on the related
network link: each component of the weights vector represents a different QoS
metric value (e.g. bandwidth, cost, delay, packet loss). The second step
consists in writing this graph as a program in Soft Constraint Logic
Programming (SCLP): the engine of this framework is then able to find the best
paths/trees by optimizing their costs and solving the constraints imposed on
them (e.g. delay < 40msec), thus finding a solution to QoS routing problems.
Moreover, c-semiring structures are a convenient tool to model QoS metrics. At
last, we provide an implementation of the framework over scale-free networks
and we suggest how the performance can be improved.


title: Zero point energy on extra dimension: Noncommutative Torus

abstract:
  In this paper we calculate the zero point energy density experienced by
observers on M^4 due to a massless scalar field defined throughout M^4 x T^2_F,
where T^2_F are fuzzy extra dimensions. Using the Green's function approach we
calculate the energy density for the commutative torus and the fuzzy torus. We
calculate then the energy density for the fuzzy torus using the Hamiltonian
approach. Agreement is shown between Green's function and Hamiltonian
approaches.


title: Three-body collisions in Boltzmann-Uehling-Uhlenbeck theory

abstract:
  Aiming at a microscopic description of heavy ion collisions in the beam
energy region of about 10 A GeV, we extend the Giessen
Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model by including a relativistic
mean field, in-medium baryon-baryon cross sections and three-body collisions.
The model is then compared with experimental data for central Au+Au collisions
at 2-10 A GeV and central Pb+Pb collisions at 30 and 40 A GeV on the proton
rapidity spectra, the midrapidity yields of $\pi^+$, $K^\pm$ and
$(\Lambda+\Sigma^0)$, and the transverse mass spectra of $\pi^\pm$ and $K^\pm$.
The three-body collisions increase the inverse slope parameters of the hadron
$m_\perp$-spectra to a good agreement with the data.


title: Learning more from the Lorentz transformations

abstract:
  Admitting the validity of Lorentz transformations for the space as time
coordinates of the same event we derive their differential form in order to
underline the correct prerequisites for the application of time and length
contraction or dilation effects. Furthermore we quantify the simultaneity error
occurring in the relativity theory. Having done this, we analyse the root cause
of these effects and identify it with a finite phase velocity associated with
the moving frame. We define this phase velocity by analogy to the de Broglie
wave associated with a moving particle. Based on this construct we demonstrate
that the phase of the de Broglie waves further extended for stationary
particles is a relativistic invariant being the same for all corresponding
observers. Also the phase of the electromagnetic waves transporting energy at
light speed is a relativistic invariant. Therefore the universe and its matter
/ energy may be seen as a superposition of waves propagating such that their
phase is the same for all corresponding observers. The wave phase may replace
the time as an invariant and universal reference.


title:
On the Mapping of Time-Dependent Densities onto Potentials in Quantum
  Mechanics

abstract:
  The mapping of time-dependent densities on potentials in quantum mechanics is
critically examined. The issue is of significance ever since Runge and Gross
(Phys. Rev. Lett. 52, 997 (1984)) established the uniqueness of the mapping,
forming a theoretical basis for time-dependent density functional theory. We
argue that besides existence (so called v-representability) and uniqueness
there is an important question of stability and chaos. Studying a 2-level
system we find innocent, almost constant densities that cannot be constructed
from any potential (non-existence). We further show via a Lyapunov analysis
that the mapping of densities on potentials has chaotic regions in this case.
In real space the situation is more subtle. V-representability is formally
assured but the mapping is often chaotic making the actual construction of the
potential almost impossible. The chaotic nature of the mapping, studied for the
first time here, has serious consequences regarding the possibility of using
TDDFT in real-time settings.


title: New Jarlskog determinant from Physics above the GUT Scal

abstract:
  We study the Planck scale effects on Jarlskog determinant. Quantum
gravitational (Planck scale) effects lead to an effective SU(2)_{L}\times U(1)
invariant dimension-5 Lagrangian involving neutrino and Higgs fields, which
gives rise to additional terms in neutrino mass matrix on electroweak symmetry
breaking. We assume that gravitational interaction is flavor blind and compute
the Jarlskog determinant due to the Planck scale effects. In the case of
neutrino sector, the strength of CP violation is measured by Jarlskog
determinant. In this paper, we assume CP violation arise from Planck scale
effects. We applied our approach to study Jarlskog determinant due to the
Planck scale effects.


title: Generalized Smirnov statistics and the distribution of prime factors

abstract:
  We apply recent bounds of the author (math.PR/0609224) for generalized
Smirnov statistics to the distribution of integers whose prime factors satisfy
certain systems of inequalities.


title: Models of Opinion Formation: Influence of Opinion Leaders

abstract:
  This paper studies the evolution of the distribution of opinions in a
population of individuals in which there exist two distinct subgroups of
highly-committed, well-connected opinion leaders endowed with a strong
convincing power. Each individual, located at a vertex of a directed graph, is
characterized by her name, the list of people she is interacting with, her
level of awareness, and her opinion. Various temporal evolutions according to
different local rules are compared in order to find under which conditions the
formation of strongly polarized subgroups, each adopting the opinion of one of
the two groups of opinion leaders, is favored.


title: Chiral Mechanisms Leading to Orbital Quantum Structures in the Nucleon

abstract:
  Color confinement and chiral symmetry specify some important territory for
the study of hadronic physics. Any hadron can be defined as a color-singlet
composite system of qurks and gluons, the fundamental fields of qcd, while the
landscape of the hadronic spectrum is dominated by the fact that two quark
flavors, u and d, are characterized by masses small compared to the fundamental
scale of this theory. Measurements sensitive to the orbital angular momenta of
the color constituents of the nucleon display the interplay of chiral dynamics
and confinement in a unique manner. This pageant can be explored by an
evaluation, within the context of the Georgi-Manohar chiral quark model, of the
normalization of the orbital structure functions and the normalization of the
Boer-Mulders functions for different quark flavors. The resolution structures
in the chiral quark model represent an evaluation of Collins functions for a
confined system defined by the quantum numbers of the nucleon in the
constituent quark model. The orbital structure functions for antiquarks can
also be specified within the basic framework of this approach while the
normalization of the gluon orbital structure function requires some additional
assumptions.


title: Quantum control and entanglement using periodic driving fields

abstract:
  We propose a scheme for producing directed motion in a lattice system by
applying a periodic driving potential. By controlling the dynamics by means of
the effect known as coherent destruction of tunneling, we demonstrate a novel
ratchet-like effect that enables particles to be coherently manipulated and
steered without requiring local control. Entanglement between particles can
also be controllably generated, which points to the attractive possibility of
using these technique for quantum information processing.


title: Intrinsic ripples in graphene

abstract:
  The stability of two-dimensional (2D) layers and membranes is subject of a
long standing theoretical debate. According to the so called Mermin-Wagner
theorem, long wavelength fluctuations destroy the long-range order for 2D
crystals. Similarly, 2D membranes embedded in a 3D space have a tendency to be
crumpled. These dangerous fluctuations can, however, be suppressed by
anharmonic coupling between bending and stretching modes making that a
two-dimensional membrane can exist but should present strong height
fluctuations. The discovery of graphene, the first truly 2D crystal and the
recent experimental observation of ripples in freely hanging graphene makes
these issues especially important. Beside the academic interest, understanding
the mechanisms of stability of graphene is crucial for understanding electronic
transport in this material that is attracting so much interest for its unusual
Dirac spectrum and electronic properties. Here we address the nature of these
height fluctuations by means of straightforward atomistic Monte Carlo
simulations based on a very accurate many-body interatomic potential for
carbon. We find that ripples spontaneously appear due to thermal fluctuations
with a size distribution peaked around 70 \AA which is compatible with
experimental findings (50-100 \AA) but not with the current understanding of
stability of flexible membranes. This unexpected result seems to be due to the
multiplicity of chemical bonding in carbon.


title:
Counting and manipulating single electrons using a carbon nanotube
  transistor

abstract:
  We report on the electric measurements of an individual Au nanoparticle with
an ultra-high contact resistance of about $10^{19} \Omega$. The high-impedance
measurements have been carried out by counting the electrons that are
transferred onto the particle. In order to do this, a carbon nanotube is used
as the electrode for the supply of electrons but also as the detector of the
charge transfer. Measurements using single-electron detection allow us to
determine the separation between the electron states in the Au nanoparticle,
which is about 4 meV, consistent with the charging energy of the particle.
Single-electron detection with nanotubes offers great promise for the study of
electron transfer in highly resistive molecular systems.


title: Le module dendriforme sur le groupe cyclique

abstract:
  The structure of anticyclic operad on the Dendriform operad defines in
particular a matrix of finite order acting on the vector space spanned by
planar binary trees. We compute its characteristic polynomial and propose a
(compatible) conjecture for the characteristic polynomial of the Coxeter
transformation for the Tamari lattice, which is mostly a square root of this
matrix.


title:
Representation Theorems for Quadratic ${\cal F}$-Consistent Nonlinear
  Expectations

abstract:
  In this paper we extend the notion of ``filtration-consistent nonlinear
expectation" (or "${\cal F}$-consistent nonlinear expectation") to the case
when it is allowed to be dominated by a $g$-expectation that may have a
quadratic growth. We show that for such a nonlinear expectation many
fundamental properties of a martingale can still make sense, including the
Doob-Meyer type decomposition theorem and the optional sampling theorem. More
importantly, we show that any quadratic ${\cal F}$-consistent nonlinear
expectation with a certain domination property must be a quadratic
$g$-expectation. The main contribution of this paper is the finding of the
domination condition to replace the one used in all the previous works, which
is no longer valid in the quadratic case. We also show that the representation
generator must be deterministic, continuous, and actually must be of the simple
form.


title:
Film Thickness Changes in EHD Sliding Contacts Lubricated by a Fatty
  Alcohol

abstract:
  This paper describes the appearance of abnormal film thickness features
formed in elastohydrodynamic contacts lubricated by a fatty alcohol.
Experiments were conducted by varying the slide to roll ratio between a steel
ball and a glass disk in a ball-on-disk type device. Lauric alcohol was used as
lubricant and film thickness was measured in the contact area by optical
interferometry. Experimental results showed that the film thickness
distributions under pure rolling conditions remained classical whereas the film
shape changed when the slide to roll ratio was increased. The thickness in the
central contact area increased and in the same time inlet and exit film
thicknesses were modified. In addition, the film shapes observed when the ball
surface was moving faster than the disk one and those obtained in the opposite
case were different, i.e. when opposite signs but equal absolute values of the
slide to roll ratio were applied.


title:
A unified shear-thinning treatment of both film thickness and traction
  in EHD

abstract:
  A conclusive demonstration has been provided that the nature of the
shear-thinning, that affects both film thickness and traction in EHL contacts,
follows the ordinary power-law rule that has been described by many empirical
models of which Carreau is but one example. This was accomplished by accurate
measurements in viscometers of the shear response of a PAO that possesses a
very low critical stress for shear-thinning and accurate measurements
in-contact of film thickness and traction under conditions which accentuate the
shear-thinning effect. The in-contact central film thickness and traction were
entirely predictable from the rheological properties obtained from viscometers
using simple calculations. These data should be invaluable to researchers
endeavoring to accurately simulate Hertz zone behavior since the shear-thinning
rheology is extensively characterized and accurate in-contact data are
available to test. In addition, a new model has been introduced that may be
useful for the rheological characterization of mixtures.


title: Super Low Traction under EHD and Mixed Lubrication Regimes

abstract:
  After the pioneered experimental works on superlubricity by Martin et al. on
MoS2 [1], Hirano et al. on tungsten and silicon [2] and the further
confirmation by Dienwiebel et al. on graphite [3], many groups around the word
investigated the occurrence of near frictionless sliding contacts. This large
mobilization of tribologists, material sciences specialists and physicists has
lead to emerging solutions involving new materials and coatings, the most
promising being carbon based like graphite, diamond, carbon composites or
diamond-like-carbons. Some of them are currently used in practical
applications. The situation is different especially in EHL: the highest
friction coefficients are close to 10% when traction fluids are involved, i.e.
fluids that have especially designed to transmit the highest friction, and they
vary within 3-6% for the rest of lubricants. The range of variation is
consequently very narrow and these typical values are really low compared to
those obtained in dry contacts: as a consequence the gain expected from a super
low traction regime in lubrication will be probably more limited, especially in
the case of experiments conducted at the meso or macro scales. This weak
perspective could be one explanation on the relatively low number of articles
in recent literature dealing with lubricated superlubricity in the above
conditions.


title: Phenomenology with Massive Neutrinos

abstract:
  The current status and some perspectives of the phenomenology of massive
neutrinos is reviewed. We start with the phenomenology of neutrino oscillations
in vacuum and in matter. We summarize the results of neutrino experiments using
solar, atmospheric, reactor and accelerator neutrino beams. We update the
leptonic parameters derived from the three-neutrino oscillation interpretation
of this data. We describe the method and present results on our understanding
of the solar and atmospheric neutrino fluxes by direct extraction from the
corresponding neutrino event rates. We present some tests of different forms of
new physics which induce new sources of leptonic flavor transitions in vacuum
and in matter which can be performed with the present neutrino data. The aim
and potential of future neutrino experiments and facilities to further advance
in these fronts is also briefly summarized. Last, the implications of the LSND
observations are discussed, and the status of extended models which could
accommodate all flavor-mixing signals is presented in the light of the recent
results from MiniBooNE.


title: A calculation of the shear viscosity in SU(3) gluodynamics

abstract:
  We perform a lattice Monte-Carlo calculation of the two-point functions of
the energy-momentum tensor at finite temperature in the SU(3) gauge theory.
Unprecedented precision is obtained thanks to a multi-level algorithm. The
lattice operators are renormalized non-perturbatively and the classical
discretization errors affecting the correlators are corrected for. A robust
upper bound for the shear viscosity to entropy density ratio is derived, eta/s
< 1.0, and our best estimate is eta/s = 0.134(33) at T=1.65Tc under the
assumption of smoothness of the spectral function in the low-frequency region.


title: A Way to Dynamically Overcome the Cosmological Constant Problem

abstract:
  The Cosmological Constant problem can be solved once we require that the full
standard Einstein Hilbert lagrangian, gravity plus matter, is multiplied by a
total derivative. We analyze such a picture writing the total derivative as the
covariant gradient of a new vector field (b_mu). The dynamics of this b_mu
field can play a key role in the explanation of the present cosmological
acceleration of the Universe.


title:
Regularity properties in the classification program for separable
  amenable C*-algebras

abstract:
  We report on recent progress in the program to classify separable amenable
C*-algebras. Our emphasis is on the newly apparent role of regularity
properties such as finite decomposition rank, strict comparison of positive
elements, and Z-stability, and on the importance of the Cuntz semigroup. We
include a brief history of the program's successes since 1989, a more detailed
look at the Villadsen-type algebras which have so dramatically changed the
landscape, and a collection of announcements on the structure and properties of
the Cuntz semigroup.


title:
Equation of state of atomic systems beyond s-wave determined by the
  lowest order constrained variational method: Large scattering length limit

abstract:
  Dilute Fermi systems with large s-wave scattering length a_s exhibit
universal properties if the interparticle spacing r_o greatly exceeds the range
of the underlying two-body interaction potential. In this regime, r_o is the
only relevant length scale and observables such as the energy per particle
depend only on r_o (or, equivalently, the energy E_{FG} of the free Fermi gas).
This paper investigates Bose and Fermi systems with non-vanishing angular
momentum l using the lowest order constrained variational method. We focus on
the regime where the generalized scattering length becomes large and determine
the relevant length scales. For Bose gases with large generalized scattering
lengths, we obtain simple expressions for the energy per particle in terms of a
l-dependent length scale \xi_l, which depends on the range of the underlying
two-body potential and the average interparticle spacing. We discuss possible
implications for dilute two-component Fermi systems with finite l. Furthermore,
we determine the equation of state of liquid and gaseous bosonic helium.


title:
On Charge Conservation and The Equivalence Principle in the
  Noncommutative Spacetime

abstract:
  We investigate one of the consequences of the twisted Poincare symmetry. We
derive the charge conservation law and show that the equivalence principle is
satisfied in the canonical noncommutative spacetime. We applied the twisted
Poincare symmetry to the Weinberg's analysis. To this end, we generalize our
earlier construction of the twisted S matrix \cite{Bu}, which apply the
noncommutativity to the fourier modes, to the massless fields of integer spins.
The transformation formula for the twisted S matrix for the massless fields of
integer spin has been obtained. For massless fields of spin 1, we obtain the
conservation of charge, and the universality of coupling constant for massless
fields of spin 2, which can be interpreted as the equality of gravitational
mass and inertial mass, i.e., the equivalence principle.


title: Critical Scaling of Shear Viscosity at the Jamming Transition

abstract:
  We carry out numerical simulations to study transport behavior about the
jamming transition of a model granular material in two dimensions at zero
temperature. Shear viscosity \eta is computed as a function of particle volume
density \rho and applied shear stress \sigma, for diffusively moving particles
with a soft core interaction. We find an excellent scaling collapse of our data
as a function of the scaling variable \sigma/|\rho_c-\rho|^\Delta, where \rho_c
is the critical density at \sigma=0 ("point J"), and \Delta is the crossover
scaling critical exponent. Our results show that jamming is a true critical
phenomenon, extending to driven steady states along the non-equilibrium \sigma
axis of the \rho-\sigma phase diagram.


title: Polar actions on compact Euclidean hypersurfaces

abstract:
  Given an isometric immersion $f\colon M^n\to \R^{n+1}$ of a compact
Riemannian manifold of dimension $n\geq 3$ into Euclidean space of dimension
$n+1$, we prove that the identity component $Iso^0(M^n)$ of the isometry group
$Iso(M^n)$ of $M^n$ admits an orthogonal representation $\Phi\colon
Iso^0(M^n)\to SO(n+1)$ such that $f\circ g=\Phi(g)\circ f$ for every $g\in
Iso^0(M^n)$. If $G$ is a closed connected subgroup of $Iso(M^n)$ acting locally
polarly on $M^n$, we prove that $\Phi(G)$ acts polarly on $\R^{n+1}$, and we
obtain that $f(M^n)$ is given as $\Phi(G)(L)$, where $L$ is a hypersurface of a
section which is invariant under the Weyl group of the $\Phi(G)$-action. We
also find several sufficient conditions for such an $f$ to be a rotation
hypersurface. Finally, we show that compact Euclidean rotation hypersurfaces of
dimension $n\geq 3$ are characterized by their underlying warped product
structure.


title:
Tests of Bayesian Model Selection Techniques for Gravitational Wave
  Astronomy

abstract:
  The analysis of gravitational wave data involves many model selection
problems. The most important example is the detection problem of selecting
between the data being consistent with instrument noise alone, or instrument
noise and a gravitational wave signal. The analysis of data from ground based
gravitational wave detectors is mostly conducted using classical statistics,
and methods such as the Neyman-Pearson criteria are used for model selection.
Future space based detectors, such as the \emph{Laser Interferometer Space
Antenna} (LISA), are expected to produced rich data streams containing the
signals from many millions of sources. Determining the number of sources that
are resolvable, and the most appropriate description of each source poses a
challenging model selection problem that may best be addressed in a Bayesian
framework. An important class of LISA sources are the millions of low-mass
binary systems within our own galaxy, tens of thousands of which will be
detectable. Not only are the number of sources unknown, but so are the number
of parameters required to model the waveforms. For example, a significant
subset of the resolvable galactic binaries will exhibit orbital frequency
evolution, while a smaller number will have measurable eccentricity. In the
Bayesian approach to model selection one needs to compute the Bayes factor
between competing models. Here we explore various methods for computing Bayes
factors in the context of determining which galactic binaries have measurable
frequency evolution. The methods explored include a Reverse Jump Markov Chain
Monte Carlo (RJMCMC) algorithm, Savage-Dickie density ratios, the Schwarz-Bayes
Information Criterion (BIC), and the Laplace approximation to the model
evidence. We find good agreement between all of the approaches.


title:
All tight multipartite Bell correlation inequalities for an arbitrary
  number of dichotomic observables per observer

abstract:
  Derivation of the full set of Bell inequalities involving correlation
functions, for two parties, with binary observables, and N possible local
settings is not as easy as it seemed. The proof of v1 is wrong. Additionaly one
can find a counterexample, which will be presented soon. Thus our thesis is
dead. Still the series of Bell inequalities discussed in the manuscript (v1)
form a necessary condition for local realism, and are tight. They are tight and
complete (sufficient) only for N=3 settings per observer (as shown in
quant-ph/0611086, fortunately using an entirely different approach).


title:
A Cascade Model for Particle Concentration and Enstrophy in Fully
  Developed Turbulence with Mass Loading Feedback

abstract:
  A cascade model is described based on multiplier distributions determined
from 3D direct numerical simulations (DNS) of turbulent particle laden flows,
which include two-way coupling between the phases at global mass loadings equal
to unity. The governing Eulerian equations are solved using pseudo-spectral
methods on up to 512**3 computional grid points. DNS results for particle
concentration and enstrophy at Taylor microscale Reynolds numbers in the range
34 - 170 were used to directly determine multiplier distributions (PDFs) on
spatial scales 3 times the Kolmogorov length scale. The width of the PDFs,
which is a measure of intermittency, decreases with increasing mass loading
within the local region where the multipliers are measured. The functional form
of this dependence is not sensitive to Reynolds numbers in the range
considered. A partition correlation probability is included in the cascade
model to account for the observed spatial anticorrelation between particle
concentration and enstrophy. Joint probability distribution functions of
concentration and enstrophy generated using the cascade model are shown to be
in excellent agreement with those derived directly from our 3D simulations.
Probabilities predicted by the cascade model are presented at Reynolds numbers
well beyond what is achievable by direct simulation. These results clearly
indicate that particle mass loading significantly reduces the probabilities of
high particle concentration and enstrophy relative to those resulting from
unloaded runs. Particle mass density appears to reach a limit at around 100
times the gas density. This approach has promise for significant computational
savings in certain applications.


title: Unifying Evolutionary and Network Dynamics

abstract:
  Many important real-world networks manifest "small-world" properties such as
scale-free degree distributions, small diameters, and clustering. The most
common model of growth for these networks is "preferential attachment", where
nodes acquire new links with probability proportional to the number of links
they already have. We show that preferential attachment is a special case of
the process of molecular evolution. We present a new single-parameter model of
network growth that unifies varieties of preferential attachment with the
quasispecies equation (which models molecular evolution), and also with the
Erdos-Renyi random graph model. We suggest some properties of evolutionary
models that might be applied to the study of networks. We also derive the form
of the degree distribution resulting from our algorithm, and we show through
simulations that the process also models aspects of network growth. The
unification allows mathematical machinery developed for evolutionary dynamics
to be applied in the study of network dynamics, and vice versa.


title:
The LuckyCam Survey for Very Low Mass Binaries II: 13 new M4.5-M6.0
  Binaries

abstract:
  We present results from a high-angular-resolution survey of 78 very low mass
(VLM) binary systems with 6.0 <= V-K colour <= 7.5 and proper motion >= 0.15
arcsec/yr. 21 VLM binaries were detected, 13 of them new discoveries. The new
binary systems range in separation between 0.18 arcsec and 1.3 arcsec. The
distance-corrected binary fraction is 13.5% (+6.5%/-4%), in agreement with
previous results. 9 of the new binary systems have orbital radii > 10 AU,
including a new wide VLM binary with 27 AU projected orbital separation. One of
the new systems forms two components of a 2300 AU separation triple system. We
find that the orbital radius distribution of the binaries with V-K < 6.5 in
this survey appears to be different from that of redder (lower-mass) objects,
suggesting a possible rapid change in the orbital radius distribution at around
the M5 spectral type. The target sample was also selected to investigate X-ray
activity among VLM binaries. There is no detectable correlation between excess
X-Ray emission and the frequency and binary properties of the VLM systems.


title: The Discovery of a Companion to the Lowest Mass White Dwarf

abstract:
  We report the detection of a radial velocity companion to SDSS
J091709.55+463821.8, the lowest mass white dwarf currently known with
M~0.17Msun. The radial velocity of the white dwarf shows variations with a
semi-amplitude of 148.8 km/s and a period of 7.5936 hours, which implies a
companion mass of M > 0.28Msun. The lack of evidence of a companion in the
optical photometry forces any main-sequence companion to be smaller than
0.1Msun, hence a low mass main sequence star companion is ruled out for this
system. The companion is most likely another white dwarf, and we present
tentative evidence for an evolutionary scenario which could have produced it.
However, a neutron star companion cannot be ruled out and follow-up radio
observations are required to search for a pulsar companion.


title: A Measure of de Sitter Entropy and Eternal Inflation

abstract:
  We show that in any model of non-eternal inflation satisfying the null energy
condition, the area of the de Sitter horizon increases by at least one Planck
unit in each inflationary e-folding. This observation gives an operational
meaning to the finiteness of the entropy S_dS of an inflationary de Sitter
space eventually exiting into an asymptotically flat region: the asymptotic
observer is never able to measure more than e^(S_dS) independent inflationary
modes. This suggests a limitation on the amount of de Sitter space outside the
horizon that can be consistently described at the semiclassical level, fitting
well with other examples of the breakdown of locality in quantum gravity, such
as in black hole evaporation. The bound does not hold in models of inflation
that violate the null energy condition, such as ghost inflation. This
strengthens the case for the thermodynamical interpretation of the bound as
conventional black hole thermodynamics also fails in these models, strongly
suggesting that these theories are incompatible with basic gravitational
principles.


title: Kondo-lattice screening in a d-wave superconductor

abstract:
  We show that local moment screening in a Kondo lattice with d-wave
superconducting conduction electrons is qualitatively different from the
corresponding single Kondo impurity case. Despite the conduction-electron
pseudogap, Kondo-lattice screening is stable if the gap amplitude obeys $\Delta
<\sqrt{\tk D}$, in contrast to the single impurity condition $\Delta <\tk$
(where $\tk$ is the Kondo temperature for $\Delta = 0$ and D is the bandwidth).
Our theory explains the heavy electron behavior in the d-wave superconductor
Nd_{2-x}Ce_{x}CuO_{4}.


title:
Coincident, 100 kpc-scale damped Lyman alpha absorption towards a binary
  QSO: how large are galaxies at z ~ 3?

abstract:
  We report coincident damped Lyman alpha (DLA) and sub-DLA absorption at z =
2.66 and z = 2.94 towards the z ~ 3 13.8 arcsecond separation binary quasar
SDSS 1116+4118 AB. At the redshifts of the absorbers, this angular separation
corresponds to a proper transverse separation of ~ 110 kpc. A third absorber, a
sub-DLA at z = 2.47, is detected towards SDSS 1116+4118 B, but no corresponding
high column density absorber is present towards SDSS 1116+4118 A. We use high
resolution galaxy simulations and a clustering analysis to interpret the
coincident absorption and its implications for galaxy structure at z ~ 3. We
conclude that the common absorption in the two lines of sight is unlikely to
arise from a single galaxy, or a galaxy plus satellite system, and is more
feasibly explained by a group of two or more galaxies with separations ~ 100
kpc. The impact of these findings on single line of sight observations is also
discussed; we show that abundances of DLAs may be affected by up to a few
tenths of a dex by line of sight DLA blending. From a Keck ESI spectrum of the
two quasars, we measure metal column densities for all five absorbers and
determine abundances for the three absorbers with log N(HI) > 20. For the two
highest N(HI) absorbers, we determine high levels of metal enrichment,
corresponding to 1/3 and 1/5 solar. These metallicities are amongst the highest
measured for DLAs at any redshift and are consistent with values measured in
Lyman break galaxies at 2 < z < 3. For the DLA at z = 2.94 we also infer an
approximately solar ratio of alpha-to-Fe peak elements from [S/Zn] = +0.05, and
measure an upper limit for the molecular fraction in this particular line of
sight of log f(H_2)< -5.5.


title: Redefining the Missing Satellites Problem

abstract:
  Numerical simulations of Milky-Way size Cold Dark Matter (CDM) halos predict
a steeply rising mass function of small dark matter subhalos and a substructure
count that greatly outnumbers the observed satellites of the Milky Way. Several
proposed explanations exist, but detailed comparison between theory and
observation in terms of the maximum circular velocity (Vmax) of the subhalos is
hampered by the fact that Vmax for satellite halos is poorly constrained. We
present comprehensive mass models for the well-known Milky Way dwarf
satellites, and derive likelihood functions to show that their masses within
0.6 kpc (M_0.6) are strongly constrained by the present data. We show that the
M_0.6 mass function of luminous satellite halos is flat between ~ 10^7 and 10^8
M_\odot. We use the ``Via Lactea'' N-body simulation to show that the M_0.6
mass function of CDM subhalos is steeply rising over this range. We rule out
the hypothesis that the 11 well-known satellites of the Milky Way are hosted by
the 11 most massive subhalos. We show that models where the brightest
satellites correspond to the earliest forming subhalos or the most massive
accreted objects both reproduce the observed mass function. A similar analysis
with the newly-discovered dwarf satellites will further test these scenarios
and provide powerful constraints on the CDM small-scale power spectrum and warm
dark matter models.


title:
Low-density graph codes that are optimal for source/channel coding and
  binning

abstract:
  We describe and analyze the joint source/channel coding properties of a class
of sparse graphical codes based on compounding a low-density generator matrix
(LDGM) code with a low-density parity check (LDPC) code. Our first pair of
theorems establish that there exist codes from this ensemble, with all degrees
remaining bounded independently of block length, that are simultaneously
optimal as both source and channel codes when encoding and decoding are
performed optimally. More precisely, in the context of lossy compression, we
prove that finite degree constructions can achieve any pair $(R, D)$ on the
rate-distortion curve of the binary symmetric source. In the context of channel
coding, we prove that finite degree codes can achieve any pair $(C, p)$ on the
capacity-noise curve of the binary symmetric channel. Next, we show that our
compound construction has a nested structure that can be exploited to achieve
the Wyner-Ziv bound for source coding with side information (SCSI), as well as
the Gelfand-Pinsker bound for channel coding with side information (CCSI).
Although the current results are based on optimal encoding and decoding, the
proposed graphical codes have sparse structure and high girth that renders them
well-suited to message-passing and other efficient decoding procedures.


title: Comments on Charges and Near-Horizon Data of Black Rings

abstract:
  We study how the charges of the black rings measured at the asymptotic
infinity are encoded in the near-horizon metric and gauge potentials,
independent of the detailed structure of the connecting region. Our analysis
clarifies how different sets of four-dimensional charges can be assigned to a
single five-dimensional object under the Kaluza-Klein reduction. Possible
choices are related by the Witten effect on dyons and by the large gauge
transformation in four and five dimensions, respectively.


title: Odd Triplet Pairing in clean Superconductor/Ferromagnet heterostructures

abstract:
  We study triplet pairing correlations in clean Ferromagnet (F)/Superconductor
(S) nanojunctions, via fully self consistent solution of the Bogoliubov-de
Gennes equations. We consider FSF trilayers, with S being an s-wave
superconductor, and an arbitrary angle $\alpha$ between the magnetizations of
the two F layers. We find that contrary to some previous expectations, triplet
correlations, odd in time, are induced in both the S and F layers in the clean
limit. We investigate their behavior as a function of time, position, and
$\alpha$. The triplet amplitudes are largest at times on the order of the
inverse ``Debye'' frequency, and at that time scale they are long ranged in
both S and F. The zero temperature condensation energy is found to be lowest
when the magnetizations are antiparallel.


title: The S-parameter in Holographic Technicolor Models

abstract:
  We study the S parameter, considering especially its sign, in models of
electroweak symmetry breaking (EWSB) in extra dimensions, with fermions
localized near the UV brane. Such models are conjectured to be dual to 4D
strong dynamics triggering EWSB. The motivation for such a study is that a
negative value of S can significantly ameliorate the constraints from
electroweak precision data on these models, allowing lower mass scales (TeV or
below) for the new particles and leading to easier discovery at the LHC. We
first extend an earlier proof of S>0 for EWSB by boundary conditions in
arbitrary metric to the case of general kinetic functions for the gauge fields
or arbitrary kinetic mixing. We then consider EWSB in the bulk by a Higgs VEV
showing that S is positive for arbitrary metric and Higgs profile, assuming
that the effects from higher-dimensional operators in the 5D theory are
sub-leading and can therefore be neglected. For the specific case of AdS_5 with
a power law Higgs profile, we also show that S ~ + O(1), including effects of
possible kinetic mixing from higher-dimensional operator (of NDA size) in the
$5D$ theory. Therefore, our work strongly suggests that S is positive in
calculable models in extra dimensions.


title: Energy Functionals for the Parabolic Monge-Ampere Equation

abstract:
  We introduce certain energy functionals to the complex Monge-Ampere equation
over a bounded domain with inhomogeneous boundary condition, and use these
functionals to show the convergence of the solution to the parabolic
Monge-Ampere equation.


title: Compatible Actions and Cohomology of Crystallographic Groups

abstract:
  We compute the cohomology of crystallographic groups with holonomy of prime
order. As an application we compute the group of gerbes associated to many
six--dimensional toroidal orbifolds arising in string theory.


title: Stochastic Heat Equation Driven by Fractional Noise and Local Time

abstract:
  The aim of this paper is to study the $d$-dimensional stochastic heat
equation with a multiplicative Gaussian noise which is white in space and it
has the covariance of a fractional Brownian motion with Hurst parameter $% H\in
(0,1)$ in time. Two types of equations are considered. First we consider the
equation in the It\^{o}-Skorohod sense, and later in the Stratonovich sense. An
explicit chaos development for the solution is obtained. On the other hand, the
moments of the solution are expressed in terms of the exponential moments of
some weighted intersection local time of the Brownian motion.


title:
Extended envelopes around Galactic Cepheids III. Y Oph and alpha Per
  from near-infrared interferometry with CHARA/FLUOR

abstract:
  Unbiased angular diameter measurements are required for accurate distances to
Cepheids using the interferometric Baade Wesselink method (IBWM). The precision
of this technique is currently limited by interferometric measurements at the
1.5% level. At this level, the center-to-limb darkening (CLD) and the presence
of circumstellar envelopes (CSE) seem to be the two main sources of bias. The
observations we performed aim at improving our knowledge of the interferometric
visibility profile of Cepheids. In particular, we assess the systematic
presence of CSE around Cepheids in order determine accurate distances with the
IBWM free from CSE biased angular diameters. We observed a Cepheid (Y Oph) for
which the pulsation is well resolved and a non-pulsating yellow supergiant
(alpha Per) using long-baseline near-infrared interferometry. We interpreted
these data using a simple CSE model we previously developed. We found that our
observations of alpha Per do not provide evidence for a CSE. The measured CLD
is explained by an hydrostatic photospheric model. Our observations of Y Oph,
when compared to smaller baseline measurements, suggest that it is surrounded
by a CSE with similar characteristics to CSE found previously around other
Cepheids. We have determined the distance to Y Oph to be d=491+/-18 pc.
Additional evidence points toward the conclusion that most Cepheids are
surrounded by faint CSE, detected by near infrared interferometry: after
observing four Cepheids, all show evidence for a CSE. Our CSE non-detection
around a non-pulsating supergiant in the instability strip, alpha Per, provides
confidence in the detection technique and suggests a pulsation driven mass-loss
mechanism for the Cepheids.


title:
Squark and Gaugino Hadroproduction and Decays in Non-Minimal Flavour
  Violating Supersymmetry

abstract:
  We present an extensive analysis of squark and gaugino hadroproduction and
decays in non-minimal flavour violating supersymmetry. We employ the so-called
super-CKM basis to define the possible misalignment of quark and squark
rotations, and we use generalized (possibly complex) charges to define the
mutual couplings of (s)quarks and gauge bosons/gauginos. The cross sections for
all squark-(anti-)squark/gaugino pair and squark-gaugino associated production
processes as well as their decay widths are then given in compact analytic
form. For four different constrained supersymmetry breaking models with
non-minimal flavour violation in the second/third generation squark sector
only, we establish the parameter space regions allowed/favoured by low-energy,
electroweak precision, and cosmological constraints and display the chirality
and flavour decomposition of all up- and down-type squark mass eigenstates.
Finally, we compute numerically the dependence of a representative sample of
production cross sections at the LHC on the off-diagonal mass matrix elements
in the experimentally allowed/favoured ranges.


title: Transaction-Oriented Simulation In Ad Hoc Grids

abstract:
  This paper analyses the possibilities of performing parallel
transaction-oriented simulations with a special focus on the space-parallel
approach and discrete event simulation synchronisation algorithms that are
suitable for transaction-oriented simulation and the target environment of Ad
Hoc Grids. To demonstrate the findings a Java-based parallel
transaction-oriented simulator for the simulation language GPSS/H is
implemented on the basis of the promising Shock Resistant Time Warp
synchronisation algorithm and using the Grid framework ProActive. The
validation of this parallel simulator shows that the Shock Resistant Time Warp
algorithm can successfully reduce the number of rolled back Transaction moves
but it also reveals circumstances in which the Shock Resistant Time Warp
algorithm can be outperformed by the normal Time Warp algorithm. The conclusion
of this paper suggests possible improvements to the Shock Resistant Time Warp
algorithm to avoid such problems.


title:
Gauge invariance in gravity-like descriptions of massive gauge field
  theories

abstract:
  We discuss gravity-like formulations of massive Abelian and non-Abelian gauge
field theories in four space-time dimensions with particular emphasis on the
issue of gauge invariance. Alternative descriptions in terms of antisymmetric
tensor fields and geometric variables, respectively, are analysed. In both
approaches St\"uckelberg degrees of freedom factor out. We also demonstrate, in
the Abelian case, that the massless limit for the gauge propagator, which does
not exist in the vector potential formulation, is well-defined for the
antisymmetric tensor fields.


title: On-line Chain Partitions of Up-growing Semi-orders

abstract:
  On-line chain partition is a two-player game between Spoiler and Algorithm.
Spoiler presents a partially ordered set, point by point. Algorithm assigns
incoming points (immediately and irrevocably) to the chains which constitute a
chain partition of the order. The value of the game for orders of width $w$ is
a minimum number $\fVal(w)$ such that Algorithm has a strategy using at most
$\fVal(w)$ chains on orders of width at most $w$. We analyze the chain
partition game for up-growing semi-orders. Surprisingly, the golden ratio comes
into play and the value of the game is $\lfloor\frac{1+\sqrt{5}}{2}\; w
\rfloor$.


title:
An Electromagnetic Calorimeter for the JLab Real Compton Scattering
  Experiment

abstract:
  A lead-glass hodoscope calorimeter that was constructed for use in the
Jefferson Lab Real Compton Scattering experiment is described. The detector
provides a measurement of the coordinates and the energy of scattered photons
in the GeV energy range with resolutions of 5 mm and 6%/\sqrt(E{\gamma} [GeV]).
Features of both the detector design and its performance in the high luminosity
environment during the experiment are presented.


title: Multiplicity Fluctuations in Au+Au Collisions at RHIC

abstract:
  The preliminary data of the PHENIX collaboration for the scaled variances of
charged hadron multiplicity fluctuations in Au+Au at $\sqrt{s}=200$ GeV are
analyzed within the model of independent sources. We use the HSD transport
model to calculate the participant number fluctuations and the number of
charged hadrons per nucleon participant in different centrality bins. This
combined picture leads to a good agreement with the PHENIX data and suggests
that the measured multiplicity fluctuations result dominantly from participant
number fluctuations. The role of centrality selection and acceptance is
discussed separately.


title:
Near and Mid-IR Photometry of the Pleiades, and a New List of Substellar
  Candidate Members

abstract:
  We make use of new near and mid-IR photometry of the Pleiades cluster in
order to help identify proposed cluster members. We also use the new photometry
with previously published photometry to define the single-star main sequence
locus at the age of the Pleiades in a variety of color-magnitude planes.
  The new near and mid-IR photometry extend effectively two magnitudes deeper
than the 2MASS All-Sky Point Source catalog, and hence allow us to select a new
set of candidate very low mass and sub-stellar mass members of the Pleiades in
the central square degree of the cluster. We identify 42 new candidate members
fainter than Ks =14 (corresponding to 0.1 Mo). These candidate members should
eventually allow a better estimate of the cluster mass function to be made down
to of order 0.04 solar masses.
  We also use new IRAC data, in particular the images obtained at 8 um, in
order to comment briefly on interstellar dust in and near the Pleiades. We
confirm, as expected, that -- with one exception -- a sample of low mass stars
recently identified as having 24 um excesses due to debris disks do not have
significant excesses at IRAC wavelengths. However, evidence is also presented
that several of the Pleiades high mass stars are found to be impacting with
local condensations of the molecular cloud that is passing through the Pleiades
at the current epoch.


title: Analysis of the 802.11e Enhanced Distributed Channel Access Function

abstract:
  The IEEE 802.11e standard revises the Medium Access Control (MAC) layer of
the former IEEE 802.11 standard for Quality-of-Service (QoS) provision in the
Wireless Local Area Networks (WLANs). The Enhanced Distributed Channel Access
(EDCA) function of 802.11e defines multiple Access Categories (AC) with
AC-specific Contention Window (CW) sizes, Arbitration Interframe Space (AIFS)
values, and Transmit Opportunity (TXOP) limits to support MAC-level QoS and
prioritization. We propose an analytical model for the EDCA function which
incorporates an accurate CW, AIFS, and TXOP differentiation at any traffic
load. The proposed model is also shown to capture the effect of MAC layer
buffer size on the performance. Analytical and simulation results are compared
to demonstrate the accuracy of the proposed approach for varying traffic loads,
EDCA parameters, and MAC layer buffer space.


title:
Charge Ordering in Half-Doped Manganites: Weak Charge Disproportion and
  Leading Mechanisms

abstract:
  The apparent contradiction between the recently observed weak charge
disproportion and the traditional Mn$^{3+}$/Mn$^{4+}$ picture of the
charge-orbital orders in half-doped manganites is resolved by a novel Wannier
states analysis of the LDA$+U$ electronic structure. Strong electron itinerancy
in this charge-transfer system significantly delocalizes the occupied
low-energy "Mn$^{3+}$" Wannier states such that charge leaks into the
"Mn$^{4+}$"-sites. Furthermore, the leading mechanisms of the charge order are
quantified via our first-principles derivation of the low-energy effective
Hamiltonian. The electron-electron interaction is found to play a role as
important as the electron-lattice interaction. \ignore{A general picture of
doped holes in strongly correlated charge-transfer systems is presented and
applied to the study of charge order in half-doped manganites, using a novel
Wannier states analysis of the LDA$+U$ electronic structure. While residing
primarily in the oxygen atoms, the doped holes form additional effective $e_g$
orbitals at the low-energy scale, leading to an effective Mn$^{3+}$/Mn$^{4+}$
valence picture that enables weak charge disproportion, resolving the current
serious contradictions between the recent experimental observations of charge
distribution and traditional models. Furthermore, the leading mechanisms of the
observed charge order are quantified via our first-principles derivation of the
low-energy effective Hamiltonian


title: Direct extraction of one-loop integral coefficients

abstract:
  We present a general procedure for obtaining the coefficients of the scalar
bubble and triangle integral functions of one-loop amplitudes. Coefficients are
extracted by considering two-particle and triple unitarity cuts of the
corresponding bubble and triangle integral functions. After choosing a specific
parameterisation of the cut loop momentum we can uniquely identify the
coefficients of the desired integral functions simply by examining the
behaviour of the cut integrand as the unconstrained parameters of the cut loop
momentum approach infinity. In this way we can produce compact forms for scalar
integral coefficients. Applications of this method are presented for both QCD
and electroweak processes, including an alternative form for the recently
computed three-mass triangle coefficient in the six-photon amplitude
$A_6(1^-,2^+,3^-,4^+,5^-,6^+)$. The direct nature of this extraction procedure
allows for a very straightforward automation of the procedure.


title:
Comment on Electroweak Higgs as a Pseudo-Goldstone Boson of Broken Scale
  Invariance

abstract:
  The first model of Foot, Kobakhidze and Volkas described in their work in
arXiv:0704.1165 [hep-ph] is a tailored version of our model on broken scale
invariance in the standard model presented in hep-th/0403039.


title: Hard x-ray photoemission study of LaAlO3/LaVO3 multilayers

abstract:
  We have studied the electronic structure of multilayers composed of a band
insulator LaAlO$_3$ (LAO) and a Mott insulator LaVO$_3$ (LVO) by means of hard
x-ray photoemission spectroscopy, which has a probing depth as large as $\sim
60 {\AA}$. The Mott-Hubbard gap of LVO remained open at the interface,
indicating that the interface is insulating unlike the LaTiO$_3$/SrTiO$_3$
multilayers. We found that the valence of V in LVO were partially converted
from V$^{3+}$ to V$^{4+}$ only at the interface on the top side of the LVO
layer and that the amount of V$^{4+}$ increased with LVO layer thickness. We
suggest that the electronic reconstruction to eliminate the polarity
catastrophe inherent in the polar heterostructure is the origin of the highly
asymmetric valence change at the LVO/LAO interfaces.


title:
Performance Analysis of the IEEE 802.11e Enhanced Distributed
  Coordination Function using Cycle Time Approach

abstract:
  The recently ratified IEEE 802.11e standard defines the Enhanced Distributed
Channel Access (EDCA) function for Quality-of-Service (QoS) provisioning in the
Wireless Local Area Networks (WLANs). The EDCA uses Carrier Sense Multiple
Access with Collision Avoidance (CSMA/CA) and slotted Binary Exponential
Backoff (BEB) mechanism. We present a simple mathematical analysis framework
for the EDCA function. Our analysis considers the fact that the distributed
random access systems exhibit cyclic behavior where each station successfully
transmits a packet in a cycle. Our analysis shows that an AC-specific cycle
time exists for the EDCA function. Validating the theoretical results via
simulations, we show that the proposed analysis accurately captures EDCA
saturation performance in terms of average throughput, medium access delay, and
packet loss ratio. The cycle time analysis is a simple and insightful
substitute for previously proposed more complex EDCA models.


title: ALHEP symbolic algebra program for high-energy physics

abstract:
  ALHEP is the symbolic algebra program for high-energy physics. It deals with
amplitudes calculation, matrix element squaring, Wick theorem, dimensional
regularization, tensor reduction of loop integrals and simplification of final
expressions. The program output includes: Fortran code for differential cross
section, Mathematica files to view results and intermediate steps and TeX
source for Feynman diagrams. The PYTHIA interface is available. The project
website http://www.hep.by/alhep contains up-to-date executables, manual and
script examples.


title: Simulations of aging and plastic deformation in polymer glasses

abstract:
  We study the effect of physical aging on the mechanical properties of a model
polymer glass using molecular dynamics simulations. The creep compliance is
determined simultaneously with the structural relaxation under a constant
uniaxial load below yield at constant temperature. The model successfully
captures universal features found experimentally in polymer glasses, including
signatures of mechanical rejuvenation. We analyze microscopic relaxation
timescales and show that they exhibit the same aging characteristics as the
macroscopic creep compliance. In addition, our model indicates that the entire
distribution of relaxation times scales identically with age. Despite large
changes in mobility, we observe comparatively little structural change except
for a weak logarithmic increase in the degree of short-range order that may be
correlated to an observed decrease in aging with increasing load.


title: Gaseous Inner Disks

abstract:
  As the likely birthplaces of planets and an essential conduit for the buildup
of stellar masses, inner disks are of fundamental interest in star and planet
formation. Studies of the gaseous component of inner disks are of interest
because of their ability to probe the dynamics, physical and chemical
structure, and gas content of this region. We review the observational and
theoretical developments in this field, highlighting the potential of such
studies to, e.g., measure inner disk truncation radii, probe the nature of the
disk accretion process, and chart the evolution in the gas content of disks.
Measurements of this kind have the potential to provide unique insights on the
physical processes governing star and planet formation.


title: Fairness Provision in the IEEE 802.11e Infrastructure Basic Service Set

abstract:
  Most of the deployed IEEE 802.11e Wireless Local Area Networks (WLANs) use
infrastructure Basic Service Set (BSS) in which an Access Point (AP) serves as
a gateway between wired and wireless domains. We present the unfairness problem
between the uplink and the downlink flows of any Access Category (AC) in the
802.11e Enhanced Distributed Channel Access (EDCA) when the default settings of
the EDCA parameters are used. We propose a simple analytical model to calculate
the EDCA parameter settings that achieve weighted fair resource allocation for
all uplink and downlink flows. We also propose a simple model-assisted
measurement-based dynamic EDCA parameter adaptation algorithm. Moreover, our
dynamic solution addresses the differences in the transport layer and the
Medium Access Control (MAC) layer interactions of User Datagram Protocol (UDP)
and Transmission Control Protocol (TCP). We show that proposed Contention
Window (CW) and Transmit Opportunity (TXOP) limit adaptation at the AP provides
fair UDP and TCP access between uplink and downlink flows of the same AC while
preserving prioritization among ACs.


title: Radiation from Kinetic Poynting Flux Acceleration

abstract:
  We derive analytic formulas for the power output and critical frequency of
radiation by electrons accelerated by relativistic kinetic Poynting flux, and
validate these results with Particle-In-Cell plasma simulations. We find that
the in-situ radiation power output and critical frequency are much below those
predicted by the classical synchrotron formulae. We discuss potential
astrophysical applications of these results.


title:
A New Algebraic Structure of Finite Quantum Systems and the Modified
  Bessel Functions

abstract:
  In this paper we present a new algebraic structure (a super hyperbolic system
in our terminology) for finite quantum systems, which is a generalization of
the usual one in the two-level system.
  It fits into the so-called generalized Pauli matrices, so they play an
important role in the theory. Some deep relation to the modified Bessel
functions of integer order is pointed out.
  By taking a skillful limit finite quantum systems become quantum mechanics on
the circle developed by Ohnuki and Kitakado.


title: The Lee-Wick Standard Model

abstract:
  We construct a modification of the standard model which stabilizes the Higgs
mass against quadratically divergent radiative corrections, using ideas
originally discussed by Lee and Wick in the context of a finite theory of
quantum electrodynamics. The Lagrangian includes new higher derivative
operators. We show that the higher derivative terms can be eliminated by
introducing a set of auxiliary fields; this allows for convenient computation
and makes the physical interpretation more transparent. Although the theory is
unitary, it does not satisfy the usual analyticity conditions.


title: Specht modules and Kazhdan--Lusztig cells in type $B_n$

abstract:
  Dipper, James and Murphy generalized the classical Specht module theory to
Hecke algebras of type $B_n$. On the other hand, for any choice of a monomial
order on the parameters in type $B_n$, we obtain corresponding Kazhdan--Lusztig
cell modules. In this paper, we show that the Specht modules are naturally
equivalent to the Kazhdan--Lusztig cell modules {\em if} we choose the
dominance order on the parameters, as in the ``asymptotic case'' studied by
Bonnaf\'e and the second named author. We also give examples which show that
such an equivalence does not hold for other choices of monomial orders.


title:
Growing Networks: Limit in-degree distribution for arbitrary out-degree
  one

abstract:
  We compute the stationary in-degree probability, $P_{in}(k)$, for a growing
network model with directed edges and arbitrary out-degree probability. In
particular, under preferential linking, we find that if the nodes have a light
tail (finite variance) out-degree distribution, then the corresponding
in-degree one behaves as $k^{-3}$. Moreover, for an out-degree distribution
with a scale invariant tail, $P_{out}(k)\sim k^{-\alpha}$, the corresponding
in-degree distribution has exactly the same asymptotic behavior only if
$2<\alpha<3$ (infinite variance). Similar results are obtained when
attractiveness is included. We also present some results on descriptive
statistics measures %descriptive statistics such as the correlation between the
number of in-going links, $D_{in}$, and outgoing links, $D_{out}$, and the
conditional expectation of $D_{in}$ given $D_{out}$, and we calculate these
measures for the WWW network. Finally, we present an application to the
scientific publications network. The results presented here can explain the
tail behavior of in/out-degree distribution observed in many real networks.


title: UV stable, Lorentz-violating dark energy with transient phantom era

abstract:
  Phantom fields with negative kinetic energy are often plagued by the vacuum
quantum instability in the ultraviolet region. We present a Lorentz-violating
dark energy model free from this problem and show that the crossing of the
cosmological constant boundary w=-1 to the phantom equation of state is
realized before reaching a de Sitter attractor. Another interesting feature is
a peculiar time-dependence of the effective Newton's constant; the magnitude of
this effect is naturally small but may be close to experimental limits. We also
derive momentum scales of instabilities at which tachyons or ghosts appear in
the infrared region around the present Hubble scale and clarify the conditions
under which tachyonic instabilities do not spoil homogeneity of the
present/future Universe.


title: Response of degree-correlated scale-free networks to stimuli

abstract:
  The response of degree-correlated scale-free attractor networks to stimuli is
studied. We show that degree-correlated scale-free networks are robust to
random stimuli as well as the uncorrelated scale-free networks, while
assortative (disassortative) scale-free networks are more (less) sensitive to
directed stimuli than uncorrelated networks. We find that the
degree-correlation of scale-free networks makes the dynamics of attractor
systems different from uncorrelated ones. The dynamics of correlated scale-free
attractor networks result in the effects of degree correlation on the response
to stimuli.


title: Shock and Release Temperatures in Molybdenum

abstract:
  Shock and release temperatures in Mo were calculated, taking account of
heating from plastic flow predicted using the Steinberg-Guinan model. Plastic
flow was calculated self-consistently with the shock jump conditions: this is
necessary for a rigorous estimate of the locus of shock states accessible. The
temperatures obtained were significantly higher than predicted assuming ideal
hydrodynamic loading. The temperatures were compared with surface emission
spectrometry measurements for Mo shocked to around 60GPa and then released into
vacuum or into a LiF window. Shock loading was induced by the impact of a
planar projectile, accelerated by high explosive or in a gas gun. Surface
velocimetry showed an elastic wave at the start of release from the shocked
state; the amplitude of the elastic wave matched the prediction to around 10%,
indicating that the predicted flow stress in the shocked state was reasonable.
The measured temperatures were consistent with the simulations, indicating that
the fraction of plastic work converted to heat was in the range 70-100% for
these loading conditions.


title: Spectrum of the Laplacian on Quaternionic Kahler Manifolds

abstract:
  Let $M^{4n}$ be a complete quaternionic K\"ahler manifold with scalar
curvature bounded below by $-16n(n+2)$. We get a sharp estimate for the first
eigenvalue $\lambda_1(M)$ of the Laplacian which is $\lambda_1(M)\le (2n+1)^2$.
If the equality holds, then either $M$ has only one end, or $M$ is
diffeomorphic to $\mathbb{R}\times N$ with N given by a compact manifold.
Moreover, if $M$ is of bounded curvature, $M$ is covered by the quaterionic
hyperbolic space $\mathbb{QH}^n$ and $N$ is a compact quotient of the
generalized Heisenberg group. When $\lambda_1(M)\ge \frac{8(n+2)}3$, we also
prove that $M$ must have only one end with infinite volume.


title: Biased Structural Fluctuations due to Electron Wind Force

abstract:
  Direct correlation between temporal structural fluctuations and electron wind
force is demonstrated, for the first time, by STM imaging and analysis of
atomically-resolved motion on a thin film surface under large applied current
(10e5 Amp/sqare cm). The magnitude of the momentum transfer between current
carriers and atoms in the fluctuating structure is at least five to fifteen
times (plus or minus one sigma range) larger than for freely diffusing adatoms.
The corresponding changes in surface resistivity will contribute significant
fluctuation signature to nanoscale electronic properties.


title:
Dissipation of Magnetic Flux in Primordial Star Formation: From Run-away
  Phase to Mass Accretion Phase

abstract:
  We investigate the dissipation of magnetic flux in primordial star-forming
clouds throughout their collapse including the run-away collapse phase as well
as the accretion phase. We solve the energy equation and the non-equilibrium
chemical reactions in the collapsing gas, in order to obtain the radial
distribution of the ionized fraction during the collapse. As a result, we find
the ionized fraction is high enough for the magnetic field to couple with the
gas throughout the evolution of the cloud. This result suggests that the jet
formation from protostars as well as the activation of magneto-rotational
instability in the accretion disk are enabled in the presence of the
cosmological seed magnetic flux proposed by Langer et al.(2003).


title: Teaching for transfer

abstract:
  Students, after they leave our care, are called to solve the diverse problems
of the world, so we should teach to increase transfer: the ability to apply
fundamental principles to new problems and contexts. This ability is rare. The
following pages are from a workshop for faculty on designing courses that
promote transfer. I discuss two design principles: to name the transferable
ideas and to illustrate them with examples from diverse subjects. The
discussion uses dimensional reasoning as the example of a valuable transferable
idea, illustrating it with three diverse examples.


title: Variations of the Hidden Sector in a Realistic Intersecting Brane Model

abstract:
  Recently, we discussed the first example of a phenomenologically realistic
intersecting D6-brane model. In this model, the gauge symmetry in the hidden
sector is USp(2)_1 x USp(2)_2 x USp(2)_3 x USp(2)_4. However, we find that the
USp(2)_1 x USp(2)_2 gauge symmetry can be replaced by an U(2)_{12} gauge
symmetry, and/or the USp(2)_3 x USp(2)_4 gauge symmetry can be replaced by an
U(2)_{34} gauge symmetry since the USp(2)^2 stacks of D6-branes contribute to
the same Ramond-Ramond tadpoles as those of the U(2) stacks. Thus, there are
three non-equivalent variations of the hidden sector, and the corresponding
gauge symmetries are U(2)_{12} x USp(2)_3 x USp(2)_4, U(2)_{34} x USp(2)_1 x
USp(2)_2, and U(2)_{12} x U(2)_{34}, respectively. Moreover, we study the
hidden sector gauge symmetry breaking, discuss how to decouple the additional
exotic particles, and briefly comment on the phenomenological consequences.


title: Axial Vector Tetraquark with Two s-quarks

abstract:
  Possibility of an axial vector isoscalar tetraquark $ud\bar{s}\bar{s}$ is
discussed. If a $f_1$ meson in the mass region $1.4-1.5$ GeV consists of four
quarks $ns\bar{n}\bar{s}$, the mass of the isoscalar
$ud\bar{s}\bar{s}$($\vartheta^+$-meson) state with $J^P=1^+$ is expected to be
lower than that of the $f_1$ meson. Within a flux-tube quark model, a possible
resonant state of $ud\bar{s}\bar{s}(J^{P}=1^{+})$ is suggested to appear at
$\sim$ 1.4 GeV with the width ${\cal{O}}(20\sim 50)$ MeV. We propose that the
$\vartheta^+$-meson is the good candidate for the tetraquark search, which
would be observed in the $K^+K^+\pi^-$ decay channel.


title: What is the order of 2D polymer escape transition?

abstract:
  An end-grafted flexible polymer chain in 3d space between two pistons
undergoes an abrupt transition from a confined coil to a flower-like
conformation when the number of monomers in the chain, N, reaches a critical
value. In 2d geometry, excluded volume interactions between monomers of a chain
confined inside a strip of finite length 2L transform the coil conformation
into a linear string of blobs. However, the blob picture raises questions on
the nature of this escape transition. To check the theoretical predictions
based on the blob picture we study 2d single polymer chains with excluded
volume interactions and with one end grafted in the middle of a strip of length
  2L and width H by simulating self-avoiding walks on a square lattice with the
pruned-enriched-Rosenbluth method (PERM). We estimate the free energy, the
end-to-end distance, the number of imprisoned monomers, the order parameter,
and its distribution. It is shown that in the thermodynamic limit of large N
and L but finite L/N, there is a small but finite jump in several average
characteristics, including the order parameter. We also present a theoretical
description based on the Landau free energy approach, which is in good
agreement with the simulation results. Both simulation results and the
analytical theory indicate that the 2d escape transition is a weak first-order
phase transition.


title: Detecting the Most Distant (z>7) Objects with ALMA

abstract:
  Detecting and studying objects at the highest redshifts, out to the end of
Cosmic Reionization at z>7, is clearly a key science goal of ALMA. ALMA will in
principle be able to detect objects in this redshift range both from high-J
(J>7) CO transitions and emission from ionized carbon, [CII], which is one of
the main cooling lines of the ISM. ALMA will even be able to resolve this
emission for individual targets, which will be one of the few ways to determine
dynamical masses for systems in the Epoch of Reionization. We discuss some of
the current problems regarding the detection and characterization of objects at
high redshifts and how ALMA will eliminate most (but not all) of them.


title: Weak type radial convolution operators on free group

abstract:
  Radial convolution operators on free groups with nonnegative kernel of weak
type $(2,2)$ and of restricted weak type $(2,2)$ are characterized. Estimates
of weak type $(p,p)$ are obtained as well for $1<p<2.$


title:
How Mergers May Affect The Mass Scaling Relations Between Black Holes,
  Galaxies, and Other Gravitationally Bound Systems

abstract:
  Supermassive black hole (BH) masses (MBH) are strongly correlated with galaxy
stellar bulge masses (Mbulge) and there are several ideas to explain the origin
of this relationship. This study isolates the role of galaxy mergers from
considerations of other detailed physics to more clearly show how a linear
BH-galaxy mass relation (MBH-Mgal) can naturally emerge regardless of how
primordial BHs were seeded inside galaxies, if the galaxy mass function
declines with increasing mass. Under this circumstance, the MBH-Mgal relation
is a passive attractor that eventually converges to a tight linear relation
because of two basic statistical effects: a central limit-like tendency for
galaxy mergers which is much stronger for major mergers than minor mergers, and
a convergence toward a linear relation that is due mainly to minor mergers. A
curious consequence of this thought experiment is that, if galaxy bulges are
formed by major mergers, then merging statistics naturally show that MBH would
correlate more strongly with bulge dominated galaxies, because of stronger
central-seeking tendencies, than with disk dominated galaxies. Even if some
other physics is ultimately responsible for causing a linear MBH-Mbulge
relationship, this thought experiment shows that, counter to intuition, random
merging of galaxies that harbor random BH masses tends to strengthen rather
than weaken a pre-existing, linear, correlation. This idea may be generalized
to other gravitationally bound systems (dark matter halo, compact nuclear
objects) that retain their physical identities after experiencing mergers.


title:
Analycity and smoothing effect for the coupled system of equations of
  Korteweg - de Vries type with a single point singularity

abstract:
  We study that a solution of the initial value problem associated for the
coupled system of equations of Korteweg - de Vries type which appears as a
model to describe the strong interaction of weakly nonlinear long waves, has
analyticity in time and smoothing effect up to real analyticity if the initial
data only has a single point singularity at $x=0.$


title:
Smoothing properties for the higher order nonlinear Schr\"{o}dinger
  equation with constant coefficients

abstract:
  We study local and global existence and smoothing properties for the initial
value problem associated to a higher order nonlinear Schr\"odinger equation
with constant coefficients which appears as a model for propagation of pulse in
optical fiber.


title: Double spin asymmetry in exclusive rho^0 muoproduction at COMPASS

abstract:
  The longitudinal double spin asymmetry A_1^rho for exclusive leptoproduction
of rho^0 mesons, mu + N -> mu + N + rho, is studied using the COMPASS 2002 and
2003 data. The measured reaction is incoherent exclusive rho^0 production on
polarised deuterons. The Q^2 and x dependence of A_1^rho is presented in a wide
kinematical range: 3x10^-3 < Q^2 < 7 (GeV/c)^2 and 5x10^-5 < x < 0.05. The
presented results are the first measurements of A_1^rho at small Q2 (Q2 < 0.1
(GeV/c)^2) and small x (x < 3x10^-3). The asymmetry is in general compatible
with zero in the whole kinematical range.


title: High purity bright single photon source

abstract:
  Using cavity-enhanced non-degenerate parametric downconversion, we have built
a frequency tunable source of heralded single photons with a narrow bandwidth
of 8 MHz, making it compatible with atomic quantum memories. The photon state
is 70% pure single photon as characterized by a tomographic measurement and
reconstruction of the quantum state, revealing a clearly negative Wigner
function. Furthermore, it has a spectral brightness of ~1,500 photons/s per MHz
bandwidth, making it one of the brightest single photon sources available. We
also investigate the correlation function of the down-converted fields using a
combination of two very distinct detection methods; photon counting and
homodyne measurement.


title: On $L^{1}$-Convergence of Fourier Series Under $MVBV$ Condition

abstract:
  Let $f\in L_{2\pi}$ be a real-valued even function with its Fourier series $
\frac{a_{0}}{2}+\sum_{n=1}^{\infty}a_{n}\cos nx,$ and let $S_{n}(f,x), n\geq
1,$ be the $n$-th partial sum of the Fourier series. It is well-known that if
the nonnegative sequence $\{a_{n}\}$ is decreasing and $\lim\limits_{n\to
\infty}a_{n}=0$, then $$ \lim\limits_{n\to \infty}\Vert f-S_{n}(f)\Vert_{L}=0
{if and only if} \lim\limits_{n\to \infty}a_{n}\log n=0. $$ We weaken the
monotone condition in this classical result to the so-called mean value bounded
variation ($MVBV$) condition. The generalization of the above classical result
in real-valued function space is presented as a special case of the main result
in this paper which gives the $L^{1}$% -convergence of a function $f\in
L_{2\pi}$ in complex space. We also give results on $L^{1}$-approximation of a
function $f\in L_{2\pi}$ under the $% MVBV$ condition.


title:
On global solution to the Klein-Gordon-Hartree equation below energy
  space

abstract:
  In this paper, we consider the Cauchy problem for Klein-Gordon equation with
a cubic convolution nonlinearity in $\R^3$. By making use of Bourgain's method
in conjunction with a precise Strichartz estimate of S.Klainerman and D.Tataru,
we establish the $H^s (s<1)$ global well-posedness of the Cauchy problem for
the cubic convolution defocusing Klein-Gordon-Hartree equation. Before arriving
at the previously discussed conclusion, we obtain global solution for this
non-scaling equation with small initial data in $H^{s_0}\times H^{s_0-1}$ where
$s_0=\frac\gamma 6$ but not $\frac\gamma2-1$, for this equation that we
consider is a subconformal equation in some sense. In doing so a number of
nonlinear prior estimates are already established by using Bony's
decomposition, flexibility of Klein-Gordon admissible pairs which are slightly
different from that of wave equation and a commutator estimate. We establish
this commutator estimate by exploiting cancellation property and utilizing
Coifman and Meyer multilinear multiplier theorem. As far as we know, it seems
that this is the first result on low regularity for this Klein-Gordon-Hartree
equation.


title:
Parameter estimation for power-law distributions by maximum likelihood
  methods

abstract:
  Distributions following a power-law are an ubiquitous phenomenon. Methods for
determining the exponent of a power-law tail by graphical means are often used
in practice but are intrinsically unreliable. Maximum likelihood estimators for
the exponent are a mathematically sound alternative to graphical methods.


title:
The Weil representation and Hecke operators for vector valued modular
  forms

abstract:
  We define Hecke operators on vector valued modular forms transforming with
the Weil representation associated to a discriminant form. We describe the
properties of the corresponding algebra of Hecke operators and study the action
on modular forms.


title: On the energy spectrum of the one-dimensional Klein-Gordon Oscillator

abstract:
  In the present article, we describe a method of introducing the harmonic
potential into the Klein-Gordon equation, leading to genuine bound states. The
eigenfunctions and eigenenergies are worked out explicitly.


title: Band in ARPES caused by photodissociation of Landau-Pekar polarons

abstract:
  We consider decay of phonon condensate into phonons at photodissociation of
the strong coupling large polaron (SCLP), when the charge carrier becomes free.
Expression to calculate the band in ARPES caused by photodissociation of SCLP
is obtained. The band in ARPES caused by photodissociation of strong-coupling
large-radius polarons is a broad band with the shape determined by Poisson
distribution. It can be structured or unstructured depending on the phonon
dispersion since a distance between neighbouring lines comprising the band is
the phonon energy. Half-width of the band is in the interval 1.3 - 1.7Ep,
depending on the phonon energy. The band maximum is situated approximately at
the electron energy Ephot-W-3.2Ep (where Ephot is the photon energy, W is work
function), and its position does not depend on the electron wave vector
direction.


title:
From Global to Local Dynamics: Effects of the Expansion on Astrophysical
  Structures

abstract:
  We explore the effects of background cosmology on large scale structures with
non-spherical symmetry by using the concept of quasi-equilibrium which allows
certain internal properties (e.g. angular velocity) of the bodies to change
with time. In accordance with the discovery of the accelerated phase of the
universe we model the cosmological background by two representative models: the
$\Lambda$CDM Model and the Chaplygin Gas Model. We compare the effects of the
two models on various properties of large astrophysical objects. Different
equations of state are also invoked in the investigation.


title:
Evidence for nonmonotonic magnetic field penetration in a type-I
  superconductor

abstract:
  Polarized neutron reflectometry (PNR) provides evidence that nonlocal
electrodynamics governs the magnetic field penetration in an extreme low-k
superconductor. The sample is an indium film with a large elastic mean free
path (11 mkm) deposited on a silicon oxide wafer. It is shown that PNR can
resolve the difference between the reflected neutron spin asymmetries predicted
by the local and nonlocal theories of superconductivity. The experimental data
support the nonlocal theory, which predicts a nonmonotonic decay of the
magnetic field.


title: An Achievable Rate Region for Interference Channels with Conferencing

abstract:
  In this paper, we propose an achievable rate region for discrete memoryless
interference channels with conferencing at the transmitter side. We employ
superposition block Markov encoding, combined with simultaneous superposition
coding, dirty paper coding, and random binning to obtain the achievable rate
region. We show that, under respective conditions, the proposed achievable
region reduces to Han and Kobayashi achievable region for interference
channels, the capacity region for degraded relay channels, and the capacity
region for the Gaussian vector broadcast channel. Numerical examples for the
Gaussian case are given.


title:
Electromagnetic Pulse Propagation over Nonuniform Earth Surface:
  Numerical Simulation

abstract:
  We simulate EM pulse propagation along the nonuniform earth surface using so
called time-domain parabolic equation. To solve it by finite differences, we
introduce a time-domain analog of the impedance boundary condition and a
nonlocal BC of transparency reducing open computational domain to a strip of
finite width. Numerical examples demonstrate influence of soil conductivity on
the wide-band pulse waveform. For a high-frequency modulated EM pulse, we
develop an asymptotic approach based on the ray structure of the monochromatic
wave field at carrier frequency. This radically diminishes the computation
costs and allows for pulsed wave field calculation in vast domains measured by
tens of thousands wavelengths.


title: Simulation of Graphene Nanoribbon Field Effect Transistors

abstract:
  We present an atomistic three-dimensional simulation of graphene nanoribbon
field effect transistors (GNR-FETs), based on the self-consistent solution of
the 3D Poisson and Schroedinger equation with open boundary conditions within
the non-equilibrium Green's Function formalism and a tight-binding hamiltonian.
With respect to carbon nanotube FETs, GNR-FETs exhibit comparable performance,
reduced sensitivity on the variability of channel chirality, and similar
leakage problems due to band-to-band tunneling. Acceptable transistor
performance requires effective nanoribbon width of 1-2 nm, that could be
obtained with periodic etching patterns or stress patterns.


title: Stars and the holographic upper bound on gravitational action

abstract:
  The holographic upper bound on entropy is applied to the gravitational action
associated with the non-relativistic contraction of a nebula. A critical radius
is identified, as a function of the initial radius and mass, for which the
number of bits associated with the action would equal the maximum number of
bits allowed to the body. The gravitational action of a typical star
approximately saturates the holographic bound, perhaps suggesting a physical
link between holographic principles and astrophysical processes.


title: New versions of Schur-Weyl duality

abstract:
  After reviewing classical Schur-Weyl duality, we present some other contexts
which enjoy similar features, relating to Brauer algebras and classical groups.


title:
Orbital-Free Density Functional Theory: Kinetic Potentials and Ab-Initio
  Local Pseudopotentials

abstract:
  In the density functional (DF) theory of Kohn and Sham, the kinetic energy of
the ground state of a system of noninteracting electrons in a general external
field is calculated using a set of orbitals. Orbital free methods attempt to
calculate this directly from the electron density by approximating the
universal but unknown kinetic energy density functional. However simple local
approximations are inaccurate and it has proved very difficult to devise
generally accurate nonlocal approximations. We focus instead on the kinetic
potential, the functional derivative of the kinetic energy DF, which appears in
the Euler equation for the electron density. We argue that the kinetic
potential is more local and more amenable to simple physically motivated
approximations in many relevant cases, and describe two pathways by which the
value of the kinetic energy can be efficiently calculated. We propose two
nonlocal orbital free kinetic potentials that reduce to known exact forms for
both slowly varying and rapidly varying perturbations and also reproduce exact
results for the linear response of the density of the homogeneous system to
small perturbations. A simple and systematic approach for generating accurate
and weak ab-initio local pseudopotentials which produce a smooth slowly varying
valence component of the electron density is proposed for use in orbital free
DF calculations of molecules and solids. The use of these local
pseudopotentials further minimizes the possible errors from the kinetic
potentials. Our theory yields results for the total energies and ionization
energies of atoms, and for the shell structure in the atomic radial density
profiles that are in very good agreement with calculations using the full
Kohn-Sham theory.


title: Lower bounds in some power sum problems

abstract:
  We study the power sum problem max_{v=1,...,m} | sum_{k=1}^n z_k^v | and by
using features of Fejer kernels we give new lower bounds in the case of
unimodular complex numbers z_k and m cn^2 for constants c>1.


title: Quantum Quenches in Extended Systems

abstract:
  We study in general the time-evolution of correlation functions in a extended
quantum system after the quench of a parameter in the hamiltonian. We show that
correlation functions in d dimensions can be extracted using methods of
boundary critical phenomena in d+1 dimensions. For d=1 this allows to use the
powerful tools of conformal field theory in the case of critical evolution.
Several results are obtained in generic dimension in the gaussian (mean-field)
approximation. These predictions are checked against the real-time evolution of
some solvable models that allows also to understand which features are valid
beyond the critical evolution.
  All our findings may be explained in terms of a picture generally valid,
whereby quasiparticles, entangled over regions of the order of the correlation
length in the initial state, then propagate with a finite speed through the
system. Furthermore we show that the long-time results can be interpreted in
terms of a generalized Gibbs ensemble. We discuss some open questions and
possible future developments.


title: Statistical Properties of Many Particle Eigenfunctions

abstract:
  Wavefunction correlations and density matrices for few or many particles are
derived from the properties of semiclassical energy Green functions. Universal
features of fixed energy (microcanonical) random wavefunction correlation
functions appear which reflect the emergence of the canonical ensemble as the
number of particles approaches infinity. This arises through a little known
asymptotic limit of Bessel functions. Constraints due to symmetries,
boundaries, and collisions between particles can be included.


title: The power of choice in network growth

abstract:
  The "power of choice" has been shown to radically alter the behavior of a
number of randomized algorithms. Here we explore the effects of choice on
models of tree and network growth. In our models each new node has k randomly
chosen contacts, where k > 1 is a constant. It then attaches to whichever one
of these contacts is most desirable in some sense, such as its distance from
the root or its degree. Even when the new node has just two choices, i.e., when
k=2, the resulting network can be very different from a random graph or tree.
For instance, if the new node attaches to the contact which is closest to the
root of the tree, the distribution of depths changes from Poisson to a
traveling wave solution. If the new node attaches to the contact with the
smallest degree, the degree distribution is closer to uniform than in a random
graph, so that with high probability there are no nodes in the network with
degree greater than O(log log N). Finally, if the new node attaches to the
contact with the largest degree, we find that the degree distribution is a
power law with exponent -1 up to degrees roughly equal to k, with an
exponential cutoff beyond that; thus, in this case, we need k >> 1 to see a
power law over a wide range of degrees.


title:
Terahertz Time-Domain Magnetospectroscopy of a High-Mobility
  Two-Dimensional Electron Gas

abstract:
  We have observed cyclotron resonance in a high-mobility GaAs/AlGaAs
two-dimensional electron gas by using the techniques of terahertz time-domain
spectroscopy combined with magnetic fields. From this, we calculate the real
and imaginary parts of the diagonal elements of the magnetoconductivity tensor,
which in turn allows us to extract the concentration, effective mass, and
scattering time of the electrons in the sample. We demonstrate the utility of
ultrafast terahertz spectroscopy, which can recover the true linewidth of
cyclotron resonance in a high-mobility ($>{10}^{6} \mathrm{cm^{2} V^{-1}
s^{-1}}$) sample without being affected by the saturation effect.


title: Coloring ordinals by reals

abstract:
  We study combinatorial principles we call Homogeneity Principle HP(\kappa)
and Injectivity Principle IP(\kappa,\lambda) for regular \kappa>\aleph_1 and
\lambda\leq\kappa which are formulated in terms of coloring the ordinals
<\kappa by reals.


title:
Evolution favors protein mutational robustness in sufficiently large
  populations

abstract:
  BACKGROUND: An important question is whether evolution favors properties such
as mutational robustness or evolvability that do not directly benefit any
individual, but can influence the course of future evolution. Functionally
similar proteins can differ substantially in their robustness to mutations and
capacity to evolve new functions, but it has remained unclear whether any of
these differences might be due to evolutionary selection for these properties.
  RESULTS: Here we use laboratory experiments to demonstrate that evolution
favors protein mutational robustness if the evolving population is sufficiently
large. We neutrally evolve cytochrome P450 proteins under identical selection
pressures and mutation rates in populations of different sizes, and show that
proteins from the larger and thus more polymorphic population tend towards
higher mutational robustness. Proteins from the larger population also evolve
greater stability, a biophysical property that is known to enhance both
mutational robustness and evolvability. The excess mutational robustness and
stability is well described by existing mathematical theories, and can be
quantitatively related to the way that the proteins occupy their neutral
network.
  CONCLUSIONS: Our work is the first experimental demonstration of the general
tendency of evolution to favor mutational robustness and protein stability in
highly polymorphic populations. We suggest that this phenomenon may contribute
to the mutational robustness and evolvability of viruses and bacteria that
exist in large populations.


title: An algebraic generalization of Kripke structures

abstract:
  The Kripke semantics of classical propositional normal modal logic is made
algebraic via an embedding of Kripke structures into the larger class of
pointed stably supported quantales. This algebraic semantics subsumes the
traditional algebraic semantics based on lattices with unary operators, and it
suggests natural interpretations of modal logic, of possible interest in the
applications, in structures that arise in geometry and analysis, such as
foliated manifolds and operator algebras, via topological groupoids and inverse
semigroups. We study completeness properties of the quantale based semantics
for the systems K, T, K4, S4, and S5, in particular obtaining an axiomatization
for S5 which does not use negation or the modal necessity operator. As
additional examples we describe intuitionistic propositional modal logic, the
logic of programs PDL, and the ramified temporal logic CTL.


title: Origin of the 60K plateau in YBa_2Cu_3O_6+x

abstract:
  A model for charge transfer mechanism in YBa2Cu3O6+x high-Tc cuprate based on
critical chain length concept is proposed to account for 60K and 90K plateaus
in Tc(x) dependence. It has been shown, when the statistics of CuO chain
formation was described in terms of two dimensional asymmetric next-to-nearest
neighbor Ising (ASYNNNI) model, that at any constant temperature below the top
of OII phase there exists a uniquely defined value of critical chain length
lcr(T) that yields a constant doping p(x)=const over the regime of OII phase
(related to 60K plateau of Tc(x)), while 90K plateau coincides with the
monotonously increasing p(x) over optimal doping level p=0.16 in the regime of
OI phase. Short length chains (l<lcr(T)), together with the first lcr(T)-2
holes in longer chains (l>lcr(T)), are taken as not capable of attracting
electrons from CuO2 planes.. It is shown that only a part (41%) of the
remaining l-lcr(T)+1 holes in the long chains can capture electrons. The
results obtained indicate that the ASYNNNI model and two-plateaus-like behavior
of Tc(x) in YBa2Cu3O6+x are closely connected.


title: N-homogeneous superalgebras

abstract:
  We develop the theory of N-homogeneous algebras in a super setting, with
particular emphasis on the Koszul property. To any Hecke operator on a vector
superspace, we associate certain superalgebras and generalizing the ordinary
symmetric and Grassmann algebra, respectively. We prove that these algebras are
N-Koszul. For the special case where the Hecke operator is the ordinary
supersymmetry, we derive an $N$-generalized super-version of MacMahon's
classical "master theorem".


title:
First and second sound modes at finite temperature in trapped Fermi
  gases from BCS to BEC

abstract:
  We determine the temperature $T$ dependence of first and second sound mode
frequencies for trapped Fermi gases undergoing BCS to Bose Einstein
condensation (BEC) crossover. Our results are based on the two fluid equations
in conjunction with a microscopic calculation of thermodynamical variables. As
in experiment and at unitarity, we show that the lowest radial breathing mode
is $T$ independent. At finite $T$, higher order breathing modes strongly mix
with second sound. Their complex $T$ dependence should provide an alternative
way of measuring the transition temperature, $T_c$.


title:
Computation and visualization of Casimir forces in arbitrary geometries:
  non-monotonic lateral forces and failure of proximity-force approximations

abstract:
  We present a method of computing Casimir forces for arbitrary geometries,
with any desired accuracy, that can directly exploit the efficiency of standard
numerical-electromagnetism techniques. Using the simplest possible
finite-difference implementation of this approach, we obtain both agreement
with past results for cylinder-plate geometries, and also present results for
new geometries. In particular, we examine a piston-like problem involving two
dielectric and metallic squares sliding between two metallic walls, in two and
three dimensions, respectively, and demonstrate non-additive and non-monotonic
changes in the force due to these lateral walls.


title:
Axioms for a local Reidemeister trace in fixed point and coincidence
  theory on differentiable manifolds

abstract:
  We give axioms which characterize the local Reidemeister trace for orientable
differentiable manifolds. The local Reidemeister trace in fixed point theory is
already known, and we provide both uniqueness and existence results for the
local Reidemeister trace in coincidence theory.


title: On (n+2)-dimensional n-Lie algebras

abstract:
  I show that an (n+2)-dimensional n-Lie algebra over an algebraically closed
field must have a subalgeba of codimension 1.