title: Orbital order in Mott insulators of spinless p-band fermions

abstract:
  A gas of strongly interacting spinless p-orbital fermionic atoms in 2D
optical lattices is proposed and studied. Several interesting new features are
found. In the Mott limit on a square lattice, the gas is found to be described
effectively by an orbital exchange Hamiltonian equivalent to a pseudospin-1/2
XXZ model. For a triangular, honeycomb, or Kagome lattice, the orbital exchange
is geometrically frustrated and described by a new quantum 120 degree model. We
determine the orbital ordering on the Kagome lattice, and show how orbital wave
fluctuations select ground states via the order by disorder mechanism for the
honeycomb lattice. We discuss experimental signatures of various orbital
ordering.


title: An algorithm for finding the Independence Number of a graph

abstract:
  In this paper, we prove that for every connected graph G, there exists a
split graph H with the same independence number and the same order. Then we
propose a first algorithm for finding this graph, given the degree sequence of
the input graph G. Further, we propose a second algorithm for finding the
independence number of G, given the adjacency matrix of G.


title:
Spatially Resolved Imaging at 350um of Cold Dust in Nearby Elliptical
  Galaxies

abstract:
  Continuum observations at 350um are presented of seven nearby elliptical
galaxies, for which CO-gas disks have recently been resolved with
interferometry mapping. These SHARCII mapping results provide the first clearly
resolved far-infrared(FIR) to submillimeter(submm) continuum emission from cold
dust (with temperatures 32K > T > 22K) of any elliptical galaxy at a distance
>40Mpc. The measured FIR excess shows that the most likely and dominant heating
source of this dust is not dilute stellar radiation or cooling flows, but
rather star-formation, that could have been triggered by an accretion or merger
event and fueled by dust-rich material that has settled in a dense region
co-spatial with the central CO-gas disks. The dust is detected even in two
cluster ellipticals that are deficient in HI, showing that, unlike the HI, cold
dust and CO in ellipticals can survive in the presence of hot X-ray gas, even
in galaxy clusters. No dust cooler than 20K, either distributed outside the CO
disks, or co-spatial with and heated by the entire dilute stellar optical
galaxy (or very extended HI), is currently evident.


title: Drude weight in systems with open boundary conditions

abstract:
  For finite systems, the real part of the conductivity is usually decomposed
as the sum of a zero frequency delta peak and a finite frequency regular part.
In studies with periodic boundary conditions, the Drude weight, i.e., the
weight of the zero frequency delta peak, is found to be nonzero for integrable
systems, even at very high temperatures, whereas it vanishes for generic
(nonintegrable) systems. Paradoxically, for systems with open boundary
conditions, it can be shown that the coefficient of the zero frequency delta
peak is identically zero for any finite system, regardless of its
integrability. In order for the Drude weight to be a thermodynamically
meaningful quantity, both kinds of boundary conditions should produce the same
answer in the thermodynamic limit. We shed light on these issues by using
analytical and numerical methods.


title:
Spine-sheath layer radiative interplay in subparsec-scale jets and the
  TeV emission from M87

abstract:
  Simple one-zone homogeneous synchrotron self-Compton models have severe
difficulties in explaining the TeV emission observed in the radiogalaxy M87.
Also the site of the TeV emission region is uncertain: it could be the
unresolved jet close to the nucleus, analogously to what proposed for blazars,
or an active knot, called HST-1, tens of parsec away. We explore the
possibility that the TeV emission of M87 is produced in the misaligned subpc
scale jet. We base our modelling on a structured jet, with a fast spine
surrounded by a slower layer. In this context the main site responsible for the
emission of the TeV radiation is the layer, while the (debeamed) spine accounts
for the emission from the radio to the GeV band: therefore we expect a more
complex correlation with the TeV component than that expected in one-zone
scenarios, in which both components are produced by the same region. Observed
from small angles, the spine would dominate the emission, with an overall
Spectral Energy Distribution close to those of BL Lac objects with a
synchrotron peak located at low energy (LBLs).


title: J, H, K spectro-interferometry of the Mira variable S Orionis

abstract:
  Aims: We present J, H, K interferometry with a spectral resolution of 35 for
the Mira variable S Orionis. We aim at measuring the diameter variation as a
function of wavelength that is expected due to molecular layers lying above the
continuum-forming photosphere.
  Methods: Visibility data of S Ori were obtained at phase 0.78 with the
VLTI/AMBER instrument using the fringe tracker FINITO at 29 spectral channels
between 1.29 and 2.32 mu. Apparent uniform disk (UD) diameters were computed
for each spectral channel. In addition, the visibility data were directly
compared to predictions by recent self-excited dynamic model atmospheres.
  Results: S Ori shows significant variations in the visibility values as a
function of spectral channel that can only be described by a clear variation in
the apparent angular size with wavelength. The closure phase values are close
to zero at all spectral channels, indicating the absence of asymmetric
intensity features. The apparent UD angular diameter is smallest at about 1.3
and 1.7 mu and increases by a factor of ~1.4 around 2.0 mu. The minimum UD
angular diameter is 8.1 pm 0.5 mas, corresponding to ~420 R_sun. The S Ori
visibility data and the apparent UD variations can be explained reasonably well
by a dynamic atmosphere model that includes molecular layers.
  Conclusions: The measured visibility and UD diameter variations with
wavelength resemble and generally confirm the predictions by recent dynamic
model atmospheres. [abridged]


title: Turning on the Charm

abstract:
  We argue that the strong jet quenching of heavy flavors observed in heavy-ion
collisions is to a large extent due to binary scatterings in the quark-gluon
plasma. It can be understood from first principles: the charm collision
probability beyond logarithmic accuracy and Markov evolution.


title:
Mass segregation in young star clusters: can it be detected from the
  integrated photometric properties?

abstract:
  We consider the effect of mass segregation on the observable integrated
properties of star clusters. The measurable properties depend on a combination
of the dynamical age of the cluster and the physical age of the stars in the
cluster. To investigate all possible combinations of these two quantities we
propose an analytical model for the mass function of segregated star clusters
that agrees with the results of N-body simulations, in which any combination
can be specified. For a realistic degree of mass segregation and a fixed
density profile we find with increasing age an increase in the measured core
radii and a central surface brightness that decreases in all filters more
rapidly than what is expected from stellar evolution alone. Within a Gyr the
measured core radius increases by a factor of two and the central surface
density in all filters of a segregated cluster will be overestimated by a
similar factor when not taking into account mass segregation in the conversion
from light to mass. We find that the $V-I$ colour of mass segregated clusters
decreases with radius by about 0.1-0.2 mag, which could be observable. From
recent observations of partially resolved extra-galactic clusters a decreasing
half-light radius with increasing wavelength was observed, which was attributed
to mass segregation. These observations can not be reproduced by our models. We
find that the differences between measured radii in different filters are
always smaller than 5%.


title: Distributed Power Allocation Strategies for Parallel Relay Networks

abstract:
  We consider a source-destination pair assisted by parallel regenerative
decode-and-forward relays operating in orthogonal channels. We investigate
distributed power allocation strategies for this system with limited channel
state information at the source and the relay nodes. We first propose a
distributed decision mechanism for each relay to individually make its decision
on whether to forward the source data. The decision mechanism calls for each
relay that is able to decode the information from the source to compare its
relay-to-destination channel gain with a given threshold. We identify the
optimum distributed power allocation strategy that minimizes the total transmit
power while providing a target signal-to-noise ratio at the destination with a
target outage probability. The strategy dictates the optimum choices for the
source power as well as the threshold value at the relays. Next, we consider
two simpler distributed power allocation strategies, namely the passive source
model where the source power and the relay threshold are fixed, and the single
relay model where only one relay is allowed to forward the source data. These
models are motivated by limitations on the available channel state information
as well as ease of implementation as compared to the optimum distributed
strategy. Simulation results are presented to demonstrate the performance of
the proposed distributed power allocation schemes. Specifically, we observe
significant power savings with proposed methods as compared to random relay
selection.


title: Quantum order by disorder in frustrated diamond lattice antiferromagnets

abstract:
  We present a quantum theory of frustrated diamond lattice antiferromagnets.
Considering quantum fluctuations as the predominant mechanism relieving spin
frustration, we find a rich phase diagram comprising of six phases with
coplanar spiral ordering in addition to the N\'eel phase. By computing the
specific heat of these ordered phases, we obtain a remarkable agreement between
$(k,k,0)$-spiral ordering and the experimental specific heat data for the
diamond lattice spinel compounds MnSc$_2$S$_4$, Co$_3$O$_4$ and CoRh$_2$O$_4$,
i.e. specific heat data is a strong evidence for $(k,k,0)$-spiral ordering in
all of these materials. This prediction can be tested in future neutron
scattering experiments on Co$_3$O$_4$ and CoRh$_2$O$_4$, and is consistent with
existing neutron scattering data on MnSc$_2$S$_4$. Based on this agreement we
infer a monotonically increasing relationship between frustration and the
strength of quantum fluctuations.


title: The evolving disk galaxy population

abstract:
  In this contribution, I present a simplified overview of the evolution of the
disk galaxy population since z=1, and a brief discussion of a few open
questions. Galaxy evolution surveys have found that the disk galaxy population
forms stars intensely at intermediate redshift. In particular, they dominate
the cosmic star formation rate at z<1 -- the factor of ten drop in cosmic
average comoving star formation rate in the last 8 Gyr is driven primarily by
disk physics, not by a decreasing major merger rate. Despite this intense star
formation, there has been little change in the stellar mass density in disk
galaxies since z=1; large numbers of disk galaxies are being transformed into
non-star-forming spheroid-dominated galaxies by galaxy interactions, AGN
feedback, environmental effects, and other physical processes. Finally, despite
this intense activity, the scaling relations of disk galaxies appear to evolve
little. In particular, as individual galaxies grow in mass through the
formation of stars, they appear to grow in radius (on average, the population
grows inside-out), and they appear to evolve towards somewhat higher rotation
velocity (i.e., mass is added at both small and large radii during this
inside-out growth).


title: State-dependent, addressable subwavelength lattices with cold atoms

abstract:
  We discuss how adiabatic potentials can be used to create addressable
lattices on a subwavelength scale, which can be used as a tool for local
operations and readout within a lattice substructure, while taking advantage of
the faster timescales and higher energy and temperature scales determined by
the shorter lattice spacing. For alkaline-earth-like atoms with non-zero
nuclear spin, these potentials can be made state dependent, for which we give
specific examples with $^{171}$Yb atoms. We discuss in detail the limitations
in generating the lattice potentials, in particular non-adiabatic losses, and
show that the loss rates can always be made exponentially small by increasing
the laser power.


title: Nuclear charge radius of $^8$He

abstract:
  The root-mean-square (rms) nuclear charge radius of ^8He, the most
neutron-rich of all particle-stable nuclei, has been determined for the first
time to be 1.93(3) fm. In addition, the rms charge radius of ^6He was measured
to be 2.068(11) fm, in excellent agreement with a previous result. The
significant reduction in charge radius from ^6He to ^8He is an indication of
the change in the correlations of the excess neutrons and is consistent with
the ^8He neutron halo structure. The experiment was based on laser spectroscopy
of individual helium atoms cooled and confined in a magneto-optical trap.
Charge radii were extracted from the measured isotope shifts with the help of
precision atomic theory calculations.


title: Alpha-effect dynamos with zero kinetic helicity

abstract:
  A simple explicit example of a Roberts-type dynamo is given in which the
alpha-effect of mean-field electrodynamics exists in spite of point-wise
vanishing kinetic helicity of the fluid flow. In this way it is shown that
alpha-effect dynamos do not necessarily require non-zero kinetic helicity. A
mean-field theory of Roberts-type dynamos is established within the framework
of the second-order correlation approximation. In addition numerical solutions
of the original dynamo equations are given, that are independent of any
approximation of that kind. Both theory and numerical results demonstrate the
possibility of dynamo action in the absence of kinetic helicity.


title:
Indistinguishable Macroscopic Behaviour of Palatini Gravities and
  General Relativity

abstract:
  We show that, within some modified gravity theories, such as the Palatini
models, the non-linear nature of the field equations implies that the usual
naive averaging procedure (replacing the microscopic energy-momentum by its
cosmological average) could be invalid. As a consequence, the relative motion
of particles in Palatini theories is actually indistinguishable from that
predicted by General Relativity. Moreover, there is no WEP violation. Our new
and most important result is that the cosmology and astrophysics, or put more
generally, the behaviours on macroscopic scales, predicted by these two
theories are the same, and as a result the naturalness problems associated with
the cosmological constant are not alleviated. Palatini gravity does however
predict alterations to the internal structure of particles and the particle
physics laws, e.g., corrections to the hydrogen energy levels. Measurements of
which place strong constraints on the properties of viable Palatini gravities.


title: Resonant Inelastic X-ray Scattering (RIXS) Spectra for Ladder Cuprates

abstract:
  The ladder compound Sr$_{14}$Cu$_{24}$O$_{41}$ is of interest both as a
quasi-one-dimensional analog of the superconducting cuprates and as a
superconductor in its own right when Sr is substituted by Ca. In order to model
resonant inelastic x-ray scattering (RIXS) spectra for this compound, we
investigate the simpler SrCu$_{2}$O$_{3}$ system in which the crystal structure
contains very similar ladder planes. We approximate the LDA dispersion of
SrCu$_{2}$O$_{3}$ by a Cu only two-band tight-binding model. Strong correlation
effects are incorporated by assuming an anti-ferromagnetic ground state. The
available angle-resolved photoemission (ARPES) and RIXS data on the ladder
compound are found to be in reasonable accord with our theoretical predictions.


title:
On the kinematic evolution of young local associations and the Sco-Cen
  complex

abstract:
  Context: Over the last decade, several groups of young (mainly low-mass)
stars have been discovered in the solar neighbourhood (closer than ~100 pc),
thanks to cross-correlation between X-ray, optical spectroscopy and kinematic
data. These young local associations -- including an important fraction whose
members are Hipparcos stars -- offer insights into the star formation process
in low-density environments, shed light on the substellar domain, and could
have played an important role in the recent history of the local interstellar
medium. Aims: To study the kinematic evolution of young local associations and
their relation to other young stellar groups and structures in the local
interstellar medium, thus casting new light on recent star formation processes
in the solar neighbourhood. Methods: We compiled the data published in the
literature for young local associations. Using a realistic Galactic potential
we integrated the orbits for these associations and the Sco-Cen complex back in
time. Results: Combining these data with the spatial structure of the Local
Bubble and the spiral structure of the Galaxy, we propose a recent history of
star formation in the solar neighbourhood. We suggest that both the Sco-Cen
complex and young local associations originated as a result of the impact of
the inner spiral arm shock wave against a giant molecular cloud. The core of
the giant molecular cloud formed the Sco-Cen complex, and some small cloudlets
in a halo around the giant molecular cloud formed young local associations
several million years later. We also propose a supernova in young local
associations a few million years ago as the most likely candidate to have
reheated the Local Bubble to its present temperature.


title: Fluctuating epidemics on adaptive networks

abstract:
  A model for epidemics on an adaptive network is considered. Nodes follow an
SIRS (susceptible-infective-recovered-susceptible) pattern. Connections are
rewired to break links from non-infected nodes to infected nodes and are
reformed to connect to other non-infected nodes, as the nodes that are not
infected try to avoid the infection. Monte Carlo simulation and numerical
solution of a mean field model are employed. The introduction of rewiring
affects both the network structure and the epidemic dynamics. Degree
distributions are altered, and the average distance from a node to the nearest
infective increases. The rewiring leads to regions of bistability where either
an endemic or a disease-free steady state can exist. Fluctuations around the
endemic state and the lifetime of the endemic state are considered. The
fluctuations are found to exhibit power law behavior.


title: Impact of massive neutrinos on nonlinear matter power spectrum

abstract:
  We present the first attempt to analytically study the nonlinear matter power
spectrum for a mixed dark matter (cold dark matter plus neutrinos of total mass
~0.1eV) model based on cosmological perturbation theory. The suppression in the
power spectrum amplitudes due to massive neutrinos is, compared to the linear
regime, enhanced in the weakly nonlinear regime where standard linear theory
ceases to be accurate. We demonstrate that, thanks to this enhanced effect and
the gain in the range of wavenumbers to which the PT prediction is applicable,
the use of such a nonlinear model may enable a precision of sigma(m_nu,tot) ~
0.07eV in constraining the total neutrino mass for the planned galaxy redshift
survey, a factor of 2 improvement compared to the linear regime.


title:
SMA Imaging of the Maser Emission from the H30$\alpha$ Radio
  Recombination Line in MWC349A

abstract:
  We used the Submillimeter Array to map the angular distribution of the
H30$\alpha$ recombination line (231.9 GHz) in the circumstellar region of the
peculiar star MWC349A. The resolution was $1\farcs2$, but because of high
signal-to-noise ratio we measured the positions of all maser components to
accuracies better than $0\farcs01$, at a velocity resolution of $1 kms$. The
two strongest maser components (called high velocity components) at velocities
near -14 and $32 kms$ are separated by $0\farcs048 \pm 0\farcs001$ (60 AU)
along a position angle of $102 \pm 1\arcdeg$. The distribution of maser
emission at velocities between and beyond these two strongest components were
also provided. The continuum emission lies at the center of the maser
distribution to within 10 mas. The masers appear to trace a nearly edge-on
rotating disk structure, reminiscent of the water masers in Keplerian rotation
in the nuclear accretion disk of the galaxy NGC4258. However, the maser
components in MWC349A do not follow a simple Keplerian kinematic prescription
with $v \sim r^{-1/2}$, but have a larger power law index. We explore the
possibility that the high velocity masers trace spiral density or shock waves.
We also emphasize caution in the interpretation of relative centroid maser
positions where the maser is not clearly resolved in position or velocity, and
we present simulations that illustrate the range of applicability of the
centroiding method.


title: Applying the CobiT Control Framework to Spreadsheet Developments

abstract:
  One of the problems reported by researchers and auditors in the field of
spreadsheet risks is that of getting and keeping managements attention to the
problem. Since 1996, the Information Systems Audit & Control Foundation and the
IT Governance Institute have published CobiT which brings mainstream IT control
issues into the corporate governance arena. This paper illustrates how
spreadsheet risk and control issues can be mapped onto the CobiT framework and
thus brought to managers attention in a familiar format.


title: Bounding the Bogoliubov coefficients

abstract:
  While over the last century or more considerable effort has been put into the
problem of finding approximate solutions for wave equations in general, and
quantum mechanical problems in particular, it appears that as yet relatively
little work seems to have been put into the complementary problem of
establishing rigourous bounds on the exact solutions. We have in mind either
bounds on parametric amplification and the related quantum phenomenon of
particle production (as encoded in the Bogoliubov coefficients), or bounds on
transmission and reflection coefficients. Modifying and streamlining an
approach developed by one of the present authors [Phys. Rev. A 59 (1999)
427-438], we investigate this question by developing a formal but exact
solution for the appropriate second-order linear ODE in terms of a time-ordered
exponential of 2x2 matrices, then relating the Bogoliubov coefficients to
certain invariants of this matrix. By bounding the matrix in an appropriate
manner, we can thereby bound the Bogoliubov coefficients.


title:
The confinement free energies of non-ideal branched polymers and ideal
  unbranched polymers are the same

abstract:
  We use the method of dimensional reduction to show that a branching polymer
with excluded volume interaction confined between two flat plates has, in the
thermodynamic limit, a confinement free energy and density profile that is the
same as that of an ideal linear polymer with the same number of monomers and
the same monomer-plate interaction potential. Condensation due to branching is
exactly compensated by swelling due to excluded volume interaction.


title: The Boltzmann-Grad limit of the periodic Lorentz gas

abstract:
  We study the dynamics of a point particle in a periodic array of spherical
scatterers, and construct a stochastic process that governs the time evolution
for random initial data in the limit of low scatterer density (Boltzmann-Grad
limit). A generic path of the limiting process is a piecewise linear curve
whose consecutive segments are generated by a Markov process with memory two.


title: Refraction of a Gaussian Seaway

abstract:
  Refraction of a Longuet-Higgins Gaussian sea by random ocean currents creates
persistent local variations in average energy and wave action. These variations
take the form of lumps or streaks, and they explicitly survive dispersion over
wavelength and incoming wave propagation direction. Thus, the uniform sampling
assumed in the venerable Longuet-Higgins theory does not apply following
refraction by random currents. Proper handling of the non-uniform sampling
results in greatly increased probability of freak wave formation. The present
theory represents a synthesis of Longuet-Higgins Gaussian seas and the
refraction model of White and Fornberg, which considered the effect of currents
on a plane wave incident seaway. Using the linearized equations for deep ocean
waves, we obtain quantitative predictions for the increased probability of
freak wave formation when the refractive effects are taken into account. The
crest height or wave height distribution depends primarily on the ``freak
index", gamma, which measures the strength of refraction relative to the
angular spread of the incoming sea. Dramatic effects are obtained in the tail
of this distribution even for the modest values of the freak index that are
expected to occur commonly in nature. Extensive comparisons are made between
the analytical description and numerical simulations.


title: Diagonal charge modulation in the insulating La$_{2-x}$Sr$_x$CuO$_4$

abstract:
  We show that, due to the Dzyaloshinskii-Moriya and the XY anisotropies, the
disordered diagonal spin spiral in the insulating La$_{2-x}$Sr$_x$CuO$_4$
generates a diagonal charge density wave (CDW) with the wave vector twice of
that of the spin spiral. The amplitude of the CDW depends on values of the
anisotropies, the doping level, and on the density of states at the chemical
potential. Based on available experimental data we estimate that for 4% doping
the amplitude of CDW is about 1/10 of the doping level. We believe that this
mechanism explains the CDW observed recently in Zn-codoped detwinned
La$_{2-x}$Sr$_x$CuO$_4$.


title:
$N$-representability of the Jastrow wave function pair density of the
  lowest-order

abstract:
  We have recently proposed a density functional scheme for calculating the
ground-state pair density (PD) within the Jastrow wave function PDs of the
lowest-order (LO-Jastrow PDs) [M. Higuchi and K. Higuchi, Phys. Rev. A
\textbf{75}, 042510 (2007)]. However, there remained an arguable problem on the
$N$-representability of the LO-Jastrow PD. In this paper, the sufficient
conditions for the $N$-representability of the LO-Jastrow PD are derived. These
conditions are used as the constraints on the correlation function of the
Jastrow wave function. A concrete procedure to search the suitable correlation
function is also presented.


title: Minimal polynomial of an exponential automorphism of C^n

abstract:
  We show that the minimal polynomial of a polynomial exponential automorphism
F of C^n (i.e. F=exp(D), where D is a locally nilpotent derivation) is of the
form \mu_F(T)=(T-1)^d, d=min{m \in N: D^m(X_i)=0 for i=1,...,n}.


title: The Trails of Superluminal Jet Components in 3C111

abstract:
  In 1996, a major radio flux-density outburst occured in the broad-line radio
galaxy 3C111. It was followed by a particularly bright plasma ejection
associated with a superluminal jet component, which has shaped the parsec-scale
structure of 3C111 for almost a decade. Here, we present results from 18 epochs
of Very Long Baseline Array (VLBA) observations conducted since 1995 as part of
the VLBA 2 cm Survey and MOJAVE monitoring programs. This major event allows us
to study a variety of processes associated with outbursts of radio-loud AGN in
much greater detail than has been possible in other cases: the primary
perturbation gives rise to the formation of a leading and a following
component, which are interpreted as a forward and a backward-shock. Both
components evolve in characteristically different ways and allow us to draw
conclusions about the work flow of jet-production events; the expansion,
acceleration and recollimation of the ejected jet plasma in an environment with
steep pressure and density gradients are revealed; trailing components are
formed in the wake of the primary perturbation possibly as a result of coupling
to Kelvin-Helmholtz instability pinching modes from the interaction of the jet
with the external medium. The interaction of the jet with its ambient medium is
further described by the linear-polarization signature of jet components
traveling along the jet and passing a region of steep pressure/density
gradients.


title:
Transitions of tethered polymer chains: A simulation study with the bond
  fluctuation lattice model

abstract:
  A polymer chain tethered to a surface may be compact or extended, adsorbed or
desorbed, depending on interactions with the surface and the surrounding
solvent. This leads to a rich phase diagram with a variety of transitions. To
investigate these transitions we have performed Monte Carlo simulations of a
bond-fluctuation model with Wang-Landau and umbrella sampling algorithms in a
two-dimensional state space. The simulations' density of states results have
been evaluated for interaction parameters spanning the range from good to poor
solvent conditions and from repulsive to strongly attractive surfaces. In this
work, we describe the simulation method and present results for the overall
phase behavior and for some of the transitions. For adsorption in good solvent,
we compare with Metropolis Monte Carlo data for the same model and find good
agreement between the results. For the collapse transition, which occurs when
the solvent quality changes from good to poor, we consider two situations
corresponding to three-dimensional (hard surface) and two-dimensional (very
attractive surface) chain conformations, respectively. For the hard surface, we
compare tethered chains with free chains and find very similar behavior for
both types of chains. For the very attractive surface, we find the
two-dimensional chain collapse to be a two-step transition with the same
sequence of transitions that is observed for three-dimensional chains: a
coil-globule transition that changes the overall chain size is followed by a
local rearrangement of chain segments.


title:
Meta-Stable Brane Configurations by Quartic Superpotential for
  Bifundamentals

abstract:
  The type IIA nonsupersymmetric meta-stable brane configuration consisting of
three NS5-branes, D4-branes and anti-D4-branes where the electric gauge theory
superpotential has a quartic term for the bifundamentals besides a mass term is
constructed. By adding the orientifold 4-plane and 6-plane to this brane
configuration, we also describe the intersecting brane configurations of type
IIA string theory corresponding to the meta-stable nonsupersymmetric vacua of
corresponding gauge theories.


title:
Spin fluctuation effect on the electron transport through a quantum
  point contact

abstract:
  This paper has been withdrawn by the authors due to inadequate formula Eq.
(105) and following arguments.


title: Towards a classification of the tridiagonal pairs

abstract:
  Let $K$ denote a field and let $V$ denote a vector space over $K$ with finite
positive dimension. Let $End(V)$ denote the $K$-algebra consisting of all
$K$-linear transformations from $V$ to $V$. We consider a pair $A,A^* \in
End(V)$ that satisfy (i)--(iv) below:
  (i) Each of $A,A^*$ is diagonalizable.
  (ii) There exists an ordering $\{V_i\}_{i=0}^d$ of the eigenspaces of $A$
such that $A^* V_i \subseteq V_{i-1} + V_{i} + V_{i+1}$ for $0 \leq i \leq d$,
where $V_{-1}=0$ and $V_{d+1}=0$.
  (iii) There exists an ordering $\{V^*_i\}_{i=0}^\delta$ of the eigenspaces of
$A^*$ such that $A V^*_i \subseteq V^*_{i-1} + V^*_{i} + V^*_{i+1}$ for $0 \leq
i \leq \delta$, where $V^*_{-1}=0$ and $V^*_{\delta+1}=0$.
  (iv) There is no subspace $W$ of $V$ such that $AW \subseteq W$, $A^* W
\subseteq W$, $W \neq 0$, $W \neq V$.
  We call such a pair a {\em tridiagonal pair} on $V$. Let $E^*_0$ denote the
element of $End(V)$ such that $(E^*_0-I)V^*_0=0$ and $E^*_0V^*_i=0$ for $1 \leq
i \leq d$. Let $D$ (resp. $D^*$) denote the $K$-subalgebra of $End(V)$
generated by $A$ (resp. $A^*$). In this paper we prove that the span of $E^*_0
D D^*DE^*_0$ equals the span of $E^*_0D E^*_0DE^*_0$, and that the elements of
$E^*_0 D E^*_0$ mutually commute. We relate these results to some conjectures
of Tatsuro Ito and the second author that are expected to play a role in the
classification of tridiagonal pairs.


title: A note on Kosmann-Lie derivatives of Weyl spinors

abstract:
  Kosmann-Lie derivatives in the bundle of Weyl spinors are considered. It is
shown that the basic spin-tensorial fields of this bundle are constants with
respect to these derivatives.


title: Double wells, scalar fields and quantum phase transitions in ions traps

abstract:
  Since Hund's work on the ammonia molecule, the double well potential has
formed a key paradigm in physics. Its importance is further underlined by the
central role it plays in the Landau theory of phase transitions. Recently, the
study of entanglement properties of many-body systems has added a new angle to
the study of quantum phase transitions of discrete and continuous degrees of
freedom, i.e., spin and harmonic chains. Here we show that control of the
radial degree of freedom of trapped ion chains allows for the simulation of
linear and non-linear Klein-Gordon fields on a lattice, in which the parameters
of the lattice, the non-linearity and mass can be controlled at will. The
system may be driven through a phase transition creating a double well
potential between different configurations of the ion crystal. The dynamics of
the system are controllable, local properties are measurable and tunnelling in
the double well potential would be observable.


title:
One dimensional lattice of permanent magnetic microtraps for ultracold
  atoms on an atom chip

abstract:
  We report on the loading and trapping of ultracold atoms in a one dimensional
permanent magnetic lattice of period 10 micron produced on an atom chip. The
grooved structure which generates the magnetic lattice potential is fabricated
on a silicon substrate and coated with a perpendicularly magnetized
multilayered TbGdFeCo/Cr film of effective thickness 960 nm. Ultracold atoms
are evaporatively cooled in a Z-wire magnetic trap and then adiabatically
transferred to the magnetic lattice potential by applying an appropriate bias
field. Under our experimental conditions trap frequencies of up to 90 kHz in
the magnetic lattice are measured and the atoms are trapped at a distance of
less than 5 micron from the surface with a measured lifetime of about 450 ms.
These results are important in the context of studies of quantum coherence of
neutral atoms in periodic magnetic potentials on an atom chip.


title: On the Robustness of the Delay-Based Fingerprint Embedding Scheme

abstract:
  The delay-based fingerprint embedding was recently proposed to support more
users in secure media distribution scenario. In this embedding scheme, some
users are assigned the same fingerprint code with only different embedding
delay. The algorithm's robustness against collusion attacks is investigated.
However, its robustness against common desynchronization attacks, e.g.,
cropping and time shifting, is not considered. In this paper, desynchronization
attacks are used to break the delay-based fingerprint embedding algorithm. To
improve the robustness, two means are proposed to keep the embedded fingerprint
codes synchronized, i.e., adding a synchronization fingerprint and adopting the
relative delay to detect users. Analyses and experiments are given to show the
improvements.


title:
$B\to K$ Transition Form Factor with Tensor Current within the $k_T$
  Factorization Approach

abstract:
  In the paper, we apply the $k_T$ factorization approach to deal with the
$B\to K$ transition form factor with tensor current in the large recoil
regions. Main uncertainties for the estimation are discussed and we obtain
$F_T^{B\to K}(0)=0.25\pm0.01\pm0.02$, where the first error is caused by the
uncertainties from the pionic wave functions and the second is from that of the
B-meson wave functions. This result is consistent with the light-cone sum rule
results obtained in the literature.


title: Spin-charge Separated Solitons in a Topological Band Insulator

abstract:
  In this paper we construct a simple, controllable, two dimensional model
based on a topological band insulator. It has many attractive properties. (1)
We obtain spin-charge separated solitons that are associated with $\pi$ fluxes.
(2) It suggests an alternative way to classify $Z_2$ topological band insulator
without resorting to the sample boundary.
  (3) When the $\pi$ fluxes are dynamical variables, as in a correlated
insulator with emergent gauge fluxes, these solitons are propagating bosonic
excitations and their condensation triggers a phase transition into a planar
ferromagnet.


title: Neutral Current pi0 Production in the MiniBooNE Antineutrino Data

abstract:
  The single largest background to future numubar to nuebar (numu to nue)
oscillation searches is neutral current pi0 production. MiniBooNE, which began
taking antineutrino data in January 2006, has the world's largest sample of
pi0's produced by antineutrinos in the 1 GeV energy range. These neutral pions
are primarily produced through the delta resonance but can also be created
through "coherent production." The latter process is the coherent sum of
glancing scatters of (anti)neutrinos off a neutron or proton, in which the
nucleus is kept intact but a pi0 is created. Current analysis of NC pi0
production in the MiniBooNE antineutrino data will be discussed.


title: Why Unparticle Models with Mass Gaps are Examples of Hidden Valleys

abstract:
  Hidden valleys, hidden sectors with multi-particle dynamics and a mass gap,
can produce striking and unusual final states at the LHC. Unparticle models,
hidden-sectors with conformal dynamics and no (or a very small) mass gap, can
result in unusual kinematic features that indirectly reflect the conformal
dynamics. When sufficiently large mass gaps are added to unparticle models,
they become hidden valley models. Predictions using unparticle propagators
alone overlook the most striking signals, which are typically of hidden-valley
type. Inclusive signatures often cannot be predicted from unparticle
dimensions, and exclusive signatures are often visible and can be spectacular.
Among possible signatures are: Higgs decays to pairs of particles that in turn
decay to two quarks, leptons or gauge bosons, possibly with displaced vertices;
Higgs, top, and neutralino decays to more than six particles; resonances below
an ``unparticle'' continuum which produce multi-body final states; etc. The
Stephanov model is deconstructed, reconstructed, and shown to be a hidden
valley model. Some effects of strong dynamics on hidden valley observables, not
predictable using unparticle methods, are discussed, including resonances,
reduced flavor symmetry breaking, reduced supersymmetry breaking, and a
strongly enhanced hidden parton shower.


title:
Diffuse MeV Gamma-rays and Galactic 511 keV Line from Decaying WIMP Dark
  Matter

abstract:
  The origin of both the diffuse high-latitude MeV gamma-ray emission and the
511 keV line flux from the Galactic bulge are uncertain. Previous studies have
invoked dark matter physics to independently explain these observations, though
as yet none has been able to explain both of these emissions within the
well-motivated framework of Weakly-Interacting Massive Particles (WIMPs). Here
we use an unstable WIMP dark matter model to show that it is in fact possible
to simultaneously reconcile both of these observations, and in the process show
a remarkable coincidence: decaying dark matter with MeV mass splittings can
explain both observations if positrons and photons are produced with similar
branching fractions. We illustrate this idea with an unstable branon, which is
a standard WIMP dark matter candidate appearing in brane world models with
large extra dimensions. We show that because branons decay via three-body final
states, they are additionally unconstrained by searches for Galactic MeV
gamma-ray lines. As a result, such unstable long-lifetime dark matter particles
provide novel and distinct signatures that can be tested by future observations
of MeV gamma-rays.


title:
Critical comparison of several order-book models for stock-market
  fluctuations

abstract:
  Far-from-equilibrium models of interacting particles in one dimension are
used as a basis for modelling the stock-market fluctuations. Particle types and
their positions are interpreted as buy and sell orders placed on a price axis
in the order book. We revisit some modifications of well-known models, starting
with the Bak-Paczuski-Shubik model. We look at the four decades old Stigler
model and investigate its variants. One of them is the simplified version of
the Genoa artificial market. The list of studied models is completed by the
models of Maslov and Daniels et al. Generically, in all cases we compare the
return distribution, absolute return autocorrelation and the value of the Hurst
exponent. It turns out that none of the models reproduces satisfactorily all
the empirical data, but the most promising candidates for further development
are the Genoa artificial market and the Maslov model with moderate order
evaporation.


title:
Growth of stylolite teeth patterns depends on normal stress and finite
  compaction

abstract:
  Stylolites are spectacular rough dissolution surfaces that are found in many
rock types. Despite many studies, their genesis is still debated, particularly
the time scales of their formation and the relationship between this time and
their morphology. We developed a new discrete simulation technique to explore
the dynamic growth of the stylolite roughness, starting from an initially flat
dissolution surface. We demonstrate that the typical steep stylolite teeth
geometry can accurately be modelled and reproduce natural patterns. The growth
of the roughness takes place in two successive time regimes: i) an initial
non-linear increase in roughness amplitude that follows a power-law in time up
to ii) a critical time where the roughness amplitude saturates and stays
constant.


title: From Bombieri's Mean Value Theorem to the Riemann Hypothesis

abstract:
  From Bombieri's mean value theorem one can deduce the prime number theorem
being equivalent to the Riemann hypothesis and the least prime P(q) satisfying
P(q)= O(q^2 [ln q]^32) in any arithmetic progressions with common difference q.


title: The Size Distribution of Void Filaments in a LCDM Cosmology

abstract:
  The size distribution of mini-filaments in voids has been derived from the
Millennium Run halo catalogs at redshifts z=0,0.5,1 and 2. It is assumed that
the primordial tidal field originated the presence of filamentary substructures
in voids and that the void filaments have evolved only little, keeping the
initial memory of the primordial tidal field. Applying the filament-finding
algorithm based on the minimal spanning tree (MST) technique to the Millennium
voids, we identify the mini-filaments running through voids and measure their
sizes at each redshift. Then, we calculate the comoving number density of void
filaments as a function of their sizes in the logarithmic interval and
determine an analytic fitting function for it. It is found that the size
distribution of void mini-filaments in the logarithmic interval has an almost
universal shape, insensitive to the redshift: In the short-size section it is
well approximated as a power-law, while in the long-size section it decreases
exponentially. We expect that the universal size distribution of void filaments
may provide a useful cosmological probe without resorting to the rms density
fluctuations.


title:
Phase separation and collapse in Bose-Fermi mixtures with a Feshbach
  resonance

abstract:
  We consider a mixture of single-component bosonic and fermionic atoms with an
interspecies interaction that is varied using a Feshbach resonance. By
performing a mean-field analysis of a two-channel model, which describes both
narrow and broad Feshbach resonances, we find an unexpectedly rich phase
diagram at zero temperature: Bose-condensed and non-Bose-condensed phases form
a variety of phase-separated states that are accompanied by both critical and
tricritical points. We discuss the implications of our results for the
experimentally observed collapse of Bose-Fermi mixtures on the attractive side
of the Feshbach resonance, and we make predictions for future experiments on
Bose-Fermi mixtures close to a Feshbach resonance.


title: Fermions in Deep Optical Lattice under p-wave Feshbach Resonance

abstract:
  We investigate theoretically the energy levels of two identical Fermions in a
harmonic potential well under p-wave Feshbach resonance. The magnetic fields
needed to affect the energy levels differ strongly among the levels, and they
can be at values far from the free space resonant field.


title:
Second harmonic generation from metallo-dielectric multilayer photonic
  band gap structures

abstract:
  We experimentally and theoretically investigate the second order nonlinear
optical response of metallo-dielectric multilayer structures composed of Ag and
Ta2O5 layers, deposited by magnetron sputtering. Second harmonic generation
measurements were performed in reflection mode as a function of incidence
angle, using femtosecond pulses originating from a Ti:Sapphire laser system
tuned at 800 nm. The dependence of the generated signal was investigated as a
function of pump intensity and polarization state. Our experimental results
show that the conversion efficiency from a periodic metallo-dielectric sample
may be enhanced by at least a factor of 30 with respect to the conversion
efficiency from a single metal layer, thanks in part to the increased number of
active surfaces, pump field localization and penetration inside the metal
layers. The conversion efficiency maximum shifts from 70 degrees for the single
silver layer down to approximately 55 degrees for the stack. The experimental
results are found to be in good agreement with calculations based on coupled
Maxwell-Drude oscillators under the action of a nonlinear Lorentz force term.


title: AIC, BIC, Bayesian evidence against the interacting dark energy model

abstract:
  Recent astronomical observations have indicated that the Universe is in the
phase of accelerated expansion. While there are many cosmological models which
try to explain this phenomenon, we focus on the interacting $\Lambda$CDM model
where the interaction between the dark energy and dark matter sectors takes
place. This model is compared to its simpler alternative---the $\Lambda$CDM
model. To choose between these models the likelihood ratio test was applied as
well as the model comparison methods (employing Occam's principle): the Akaike
information criterion (AIC), the Bayesian information criterion (BIC) and the
Bayesian evidence. Using the current astronomical data: SNIa (Union2.1),
$h(z)$, BAO, Alcock--Paczynski test and CMB we evaluated both models. The
analyses based on the AIC indicated that there is less support for the
interacting $\Lambda$CDM model when compared to the $\Lambda$CDM model, while
those based on the BIC indicated that there is the strong evidence against it
in favor the $\Lambda$CDM model. Given the weak or almost none support for the
interacting $\Lambda$CDM model and bearing in mind Occam's razor we are
inclined to reject this model.


title: Carrier-envelope phase measurement from half-cycle high harmonics

abstract:
  We present a method to distinguish the high harmonics generated in individual
half-cycle of the driving laser pulse by mixing a weak ultraviolet pulse,
enabling one to observe the cutoff of each half-cycle harmonic. We show that
the detail information of the driving laser pulse, including the laser
intensity, pulse duration and carrier-envelope phase, can be {\it in situ}
retrieved from the harmonic spectrogram. In addition, our results show that
this method also distinguishes the half-cycle high harmonics for a pulse longer
than 10 fs, suggesting a potential to extend the CEP measurement to the
multi-cycle regime.


title: Theory of AC Anomalous Hall Conductivity in d-electron systems

abstract:
  To elucidate the intrinsic nature of anomalous Hall effect (AHE) in
$d$-electron systems, we study the AC anomalous Hall conductivity (AHC) in a
tight-binding model with ($d_{xz},d_{yz}$)-orbitals. We drive a general
expression for the AC AHC $\sigma_{xy}(\omega)$, which is valid for finite
quasiparticle damping rate $\gamma$=$\hbar/2\tau$, and find that the AC AHC is
strongly dependent on $\gamma$. When $\gamma=+0$, the AC AHC shows a spiky peak
at finite energy $\Delta$ that originates from the interband particle-hole
excitation, where $\Delta$ represents the minimum band-splitting measured from
the Fermi level. In contrast, we find that this spiky peak is quickly
suppressed when $\gamma$ is finite. By using a realistic value of
$\gamma(\omega)$ at $\omega=\Delta/2$ in $d$-electron systems, the spiky peak
is considerably suppressed. In the present model, the obtained results also
represents the AC spin Hall conductivity in a paramagnetic state.


title: Tunable Fermi acceleration in the driven elliptical billiard

abstract:
  We explore the dynamical evolution of an ensemble of non-interacting
particles propagating freely in an elliptical billiard with harmonically driven
boundaries. The existence of Fermi acceleration is shown thereby refuting the
established assumption that smoothly driven billiards whose static counterparts
are integrable do not exhibit acceleration dynamics. The underlying mechanism
based on intermittent phases of laminar and stochastic behavior of the strongly
correlated angular momentum and velocity motion is identified and studied with
varying parameters. The diffusion process in velocity space is shown to be
anomalous and we find that the corresponding characteristic exponent depends
monotonically on the breathing amplitude of the billiard boundaries. Thus it is
possible to tune the acceleration law in a straightforwardly controllable
manner.


title:
Correlation of CMB with large-scale structure: I. ISW Tomography and
  Cosmological Implications

abstract:
  We cross-correlate large scale structure (LSS) observations from a number of
surveys with CMB anisotropies from WMAP to investigate the Integrated
Sachs-Wolfe (ISW) effect as a function of redshift, covering z~0.1-2.5. Our
main goal is to go beyond reporting detections towards developing a reliable
likelihood analysis that allows one to determine cosmological constraints from
ISW observations. With this in mind we spend a considerable amount of effort in
determining the redshift-dependent bias and redshift distribution b(z)*dN/dz of
these samples by matching with spectroscopic observations where available, and
analyzing auto-power spectra and cross-power spectra between the samples. The
data sets we use are 2-Micron All Sky Survey (2MASS) samples, Sloan Digital Sky
Survey (SDSS) photometric Luminous Red Galaxies, SDSS photometric quasars and
NRAO VLA Sky Survey (NVSS) radio sources. We make a joint analysis of all
samples constructing a full covariance matrix, which we subsequently use for
cosmological parameter fitting. We report a 3.7 sigma detection of ISW
combining all the datasets. We combine the ISW likelihood function with weak
lensing of CMB and CMB power spectrum to constrain the equation of state of
dark energy and the curvature of the Universe. While ISW does not significantly
improve the constraints in the simplest 6-parameter flat Lambda CDM model, it
improves constraints on 7-parameter models with curvature by a factor of 3.2
(relative to WMAP alone) to Omega_K=-0.004^{+0.014}_{-0.020}, and with dark
energy equation of state by 15% to w=-1.01^{+0.30}_{-0.40}. (Abridged.)


title:
The Possibility of Checking the Equivalence Principle in a Null
  Gravitational Redshift by a Two-Resonator Laser System

abstract:
  A scheme of an optical detector is proposed for checking Einsteins
equivalence principle (EEP) in a null gravitational redshift experiment and for
testing methods for calculating the length of a resonator in a weak variable
gravitational field by recording the variations of the difference frequency of
resonators caused by lunisolar variations of the geopotential in a double or a
two-resonator laser system.


title: Correlation of CMB with large-scale structure: II. Weak lensing

abstract:
  We investigate the correlation of gravitational lensing of the cosmic
microwave background (CMB) with several tracers of large-scale structure,
including luminous red galaxies (LRGs), quasars, and radio sources. The lensing
field is reconstructed based on the CMB maps from the Wilkinson Microwave
Anisotropy Probe (WMAP) satellite; the LRGs and quasars are observed by the
Sloan Digital Sky Survey (SDSS); and the radio sources are observed in the NRAO
VLA Sky Survey (NVSS). Combining all three large-scale structure samples, we
find evidence for a positive cross-correlation at the $2.5\sigma$ level
($1.8\sigma$ for the SDSS samples and $2.1\sigma$ for NVSS); the
cross-correlation amplitude is $1.06\pm 0.42$ times that expected for the WMAP
cosmological parameters. Our analysis extends other recent analyses in that we
carefully determine bias weighted redshift distribution of the sources, which
is needed for a meaningful cosmological interpretation of the detected signal.
We investigate contamination of the signal by Galactic emission, extragalactic
radio and infrared sources, thermal and kinetic Sunyaev-Zel'dovich effects, and
the Rees-Sciama effect, and find all of them to be negligible.


title: The Absolute Flux Distribution of LDS749B

abstract:
  Observations from the Space Telescope Imaging Spectrograph define the flux of
the DBQ4 star LDS749B from 0.12-1.0 \mu m with an uncertainty of ~1% relative
to the three pure hydrogen WD primary HST standards. With T_{eff}=13575 K, log
g=8.05, and a trace of carbon at <1x10^{-6} of solar, a He model atmosphere
fits the measured STIS fluxes within the observational noise, except in a few
spectral lines with uncertain physics of the line broadening theory. Upper
limit to the atmospheric hydrogen and oxygen fractions by number are 1x10^{-7}
and 7x10^{-10}, respectively. The excellent agreement of the model flux
distribution with the observations lends confidence to the accuracy of the
modeled IR fluxes beyond the limits of the STIS spectrophotometry. The
estimated precision of ~1% in the predicted IR absolute fluxes at 30 \mu m
should be better than the model predictions for Vega and should be comparable
to the absolute accuracy of the three primary WD models.


title:
Possible effects of tilt order on phase transitions of a fixed
  connectivity surface model

abstract:
  We study the phase structure of a phantom tethered surface model shedding
light on the internal degrees of freedom (IDOF), which correspond to the
three-dimensional rod like structure of the lipid molecules. The so-called tilt
order is assumed as IDOF on the surface model. The model is defined by
combining the conventional spherical surface model and the XY model, which
describes not only the interaction between lipids but also the interaction
between the lipids and the surface. The interaction strength between IDOF and
the surface varies depending on the interaction strength between the variables
of IDOF. We know that the model without IDOF undergoes a first-order transition
of surface fluctuations and a first-order collapsing transition. We observe in
this paper that the order of the surface fluctuation transition changes from
first-order to second-order and to higher-order with increasing strength of the
interaction between IDOF variables. On the contrary, the order of collapsing
transition remains first-order and is not influenced by the presence of IDOF.


title:
Chandra monitoring of the very massive binary WR20a and the young
  massive cluster Westerlund2

abstract:
  Results: The two Wolf-Rayet stars WR20a (WN6ha+WN6ha) and WR20b (WN6ha) were
analyzed in detail. They are both very luminous and display very hard spectra,
but WR20b does not seem to vary. On the contrary, WR20a, a known eclipsing,
colliding-wind binary, brightens in the X-ray domain during the eclipses, i.e.
when the collision is seen face-on. This can be explained by the properties of
the wind-wind collision zone, whose high density leads to a large absorbing
column (2 10^24 cm^-2).All twelve O-type stars previously classified
spectroscopically, two eclipsing binaries previously identified and nine newly
identified O-type star candidates are detected in the high energy domain; ten
of them could be analyzed spectroscopically. Four are overluminous, but the
others present typical L_X/L_BOL ratios, suggesting that several O-type objects
are actually binaries. Variability at the ~2sigma level was detected for a
majority of the sources, of unknown origin for the putatively single objects.
Faint, soft, diffuse emission pervades the entire field-of-view but no clear
structure can be identified, even at the position of a blister proposed to be
at the origin of the TeV source HESS J1023-575. Finally, the X-ray properties
of PMS objects were also investigated, in particular the brightest flaring
ones. They provided an additional argument in favor of a large distance (~8kpc)
for the cluster.


title:
QCD corrections to double J/\psi production in e+e- annihilation at
  \sqrt{s}=10.6 GeV

abstract:
  Next-to-Leading-Order(NLO) QCD corrections to double J/psi production in
e^+e^- annihilation at sqrt{s}=10.6 GeV are calculated. We find that they
greatly decrease the cross section, with a K factor (NLO/LO) ranging from -0.31
to 0.25 depending on the renormalization scale. Although the renormalization
scale dependence indicates a large uncertainty, when combined with the NLO QCD
corrections to J/psi + eta_c production, it can explain why the double J/psi$
production could not be found at B factories while the J/psi + eta_c production
could, despite the fact that cross section of the former is larger than that of
the latter at LO by a factor of 1.8.


title:
A logical analysis of entanglement and separability in quantum
  higher-order functions

abstract:
  We present a logical separability analysis for a functional quantum
computation language. This logic is inspired by previous works on logical
analysis of aliasing for imperative functional programs. Both analyses share
similarities notably because they are highly non-compositional. Quantum setting
is harder to deal with since it introduces non determinism and thus
considerably modifies semantics and validity of logical assertions. This logic
is the first proposal of entanglement/separability analysis dealing with a
functional quantum programming language with higher-order functions.


title: A proof of the DDVV conjecture and its equality case

abstract:
  In this paper, we give a proof of the DDVV conjecture which is a pointwise
inequality involving the scalar curvature, the normal scalar curvature and the
mean curvature on a submanifold of a real space form. Furthermore we solved the
problem of its equality case.


title:
Auslander-Reiten theory for simply connected differential graded
  algebras

abstract:
  Peter Jorgensen introduced the Auslander-Reiten quiver of a simply connected
Poincare duality space. He showed that its components are of the form ZA_infty
and that the Auslander-Reiten quiver of a d-dimensional sphere consists of d-1
such components. In this thesis we show that this is the only case where
finitely many components appear. More precisely, we construct families of
modules, where for each family, each module lies in a different component.
Depending on the cohomology dimensions of the differential graded algebras
which appear, this is either a discrete family or an n-parameter family for all
n.


title: Covering theorems for Artinian rings

abstract:
  The covering properties of Artinian rings which depend on their additive
structure only, are investigated.


title: Neutrino Flavor States and the Quantum Theory of Neutrino Oscillations

abstract:
  The standard theory of neutrino oscillations is reviewed, highlighting the
main assumptions: the definition of the flavor states, the equal-momentum
assumption and the time = distance assumption. It is shown that the standard
flavor states are correct approximations of the states that describe neutrinos
in oscillation experiments. The equal-momentum assumption is shown to be
unnecessary for the derivation of the oscillation probability. The time =
distance assumption derives from the wave-packet character of the propagating
neutrinos. We present a simple quantum-mechanical wave-packet model which
allows us to describe the coherence and localization of neutrino oscillations.


title:
Hot spot formation in tumor vasculature during tumor growth in an
  arterio-venous-network environment

abstract:
  Hot spots in tumors are regions of high vascular density in the center of the
tumor and their analysis is an important diagnostic tool in cancer treatment.
We present a model for vascular remodeling in tumors predicting that the
formation of hot spots correlates with local inhomogeneities of the original
arterio-venous vasculature of the healthy tissue. Probable locations for hot
spots in the late stages of the tumor are locations of increased blood pressure
gradients. The developing tumor vasculature is non-hierarchical but still
complex displaying algebraically decaying density distributions.


title: Gauging the Poisson sigma model

abstract:
  We show how to carry out the gauging of the Poisson sigma model in an AKSZ
inspired formulation by coupling it to the a generalization of the Weil model
worked out in ref. arXiv:0706.1289 [hep-th]. We call the resulting gauged field
theory, Poisson--Weil sigma model. We study the BV cohomology of the model and
show its relation to Hamiltonian basic and equivariant Poisson cohomology. As
an application, we carry out the gauge fixing of the pure Weil model and of the
Poisson--Weil model. In the first case, we obtain the 2--dimensional version of
Donaldson--Witten topological gauge theory, describing the moduli space of flat
connections on a closed surface. In the second case, we recover the gauged A
topological sigma model worked out by Baptista describing the moduli space of
solutions of the so--called vortex equations.


title:
Thermal Lifshitz Force between Atom and Conductor with Small Density of
  Carriers

abstract:
  A new theory describing the interaction between atoms and a conductor with
small densities of current carriers is presented. The theory takes into account
the penetration of the static component of the thermally fluctuating field in
the conductor and generalizes the Lifshitz theory in the presence of a spatial
dispersion. The equation obtained for the force describes the continuous
crossover between the Lifshitz results for dielectrics and metals.


title: Skyrme Model with Different Mass Terms

abstract:
  We consider a one parameter family of mass terms for the Skyrme model that
disfavours shell-like configurations for multi-baryon classical solutions. We
argue that a model with such mass terms can provide a better description of
nuclei as shell like configurations are now less stable than in the traditional
massive Skyrme model


title: On Potentially 3-regular graph graphic Sequences

abstract:
  For given a graph $H$, a graphic sequence $\pi=(d_1,d_2,...,d_n)$ is said to
be potentially
  $H$-graphic if there exists a realization of $\pi$ containing $H$ as a
subgraph. In this paper, we characterize the potentially $H$-graphic sequences
where $H$ denotes 3-regular graph with 6 vertices. In other words, we
characterize the potentially $K_{3,3}$ and $K_6-C_6$-graphic sequences where
$K_{r,r}$ is an $r\times r$ complete bipartite graph. One of these
characterizations implies a theorem due to Yin [25].


title: Structure of normal twisted group rings

abstract:
  In this paper we describe those groups G and commutative rings K for which
the twisted group rings K*G are f-normal.


title:
Resonances and balls in obstacle scattering with Neumann boundary
  conditions

abstract:
  We consider scattering by an obstacle in $\Real^d$, $d\geq 3 $ odd. We show
that for the Neumann Laplacian if an obstacle has the same resonances as the
ball of radius $\rho$ does, then the obstacle is a ball of radius $\rho$. We
give related results for obstacles which are disjoint unions of several balls
of the same radius.


title: Counting Statistics of Non-Markovian Quantum Stochastic Processes

abstract:
  We derive a general expression for the cumulant generating function (CGF) of
non-Markovian quantum stochastic transport processes. The long-time limit of
the CGF is determined by a single dominating pole of the resolvent of the
memory kernel from which we extract the zero-frequency cumulants of the current
using a recursive scheme. The finite-frequency noise is expressed not only in
terms of the resolvent, but also initial system-environment correlations. As an
illustrative example we consider electron transport through a dissipative
double quantum dot for which we study the effects of dissipation on the
zero-frequency cumulants of high orders and the finite-frequency noise.


title:
Partition function for the two-dimensional square lattice Ising model in
  a non-zero magnetic field-A heuristic analysis

abstract:
  The exact partition function of the two-dimensional nearest neighbour Ising
model pertaining to square lattices is derived for N sites in the case of a
non-vanishing magnetic field.When the magnetic field is zero,the partition
functions estimated from the present analysis are identical with those arising
from Onsager's exact solution.


title: WW Scattering in Walking Technicolor

abstract:
  We analyze the WW scattering in scenarios of dynamical electroweak symmetry
breaking of walking technicolor type. We show that in these theories there are
regions of the parameters space allowed by the electroweak precision data, in
which unitarity violation is delayed at tree level up to around 3-4 TeV without
the inclusion of any sub-TeV resonances.


title: When the spatial networks split?

abstract:
  We consider a three dimensional spatial network, where $N$ nodes are randomly
distributed within a cube $L\times L\times L$. Each two nodes are connected if
their mutual distance does not excess a given cutoff $a$. We analyse
numerically the probability distribution of the critical density
$\rho_c=N(a_c/L)^3$, where one or more nodes become separated; $\rho_c$ is
found to increase with $N$ as $N^{0.105}$, where $N$ is between 20 and 300. The
results can be useful for a design of protocols to control sets of wearable
sensors.


title: A theorem of Cobham for non-primitive substitutions

abstract:
  In this article we generalize Cobham theorem to a large class of
substitutions including non primitive and non constant length substitutions.


title: Spin-hybrid-phonon resonance in anisotropic quantum dots

abstract:
  We have studied the absorption of electromagnetic radiation of an anisotropic
quantum dot taking into account the spin-flip processes that is associated with
the interaction of the electrons with optical phonons. It is shown that these
processes lead to the resonance absorption. Explicit formula is derived for the
absorption coefficient. The positions of the resonances peaks are found.


title: Invariant boundary distributions for finite graphs

abstract:
  Let $\Gamma$ be the fundamental group of a finite connected graph $\mathcal
G$. Let $\mathfrak M$ be an abelian group. A {\it distribution} on the boundary
$\partial\Delta$ of the universal covering tree $\Delta$ is an $\mathfrak
M$-valued measure defined on clopen sets. If $\mathfrak M$ has no
$\chi(\mathcal G)$-torsion then the group of $\Gamma$-invariant distributions
on $\partial\Delta$ is isomorphic to $H_1(\mathcal G,\mathfrak M)$.


title: Ab initio investigation of intermolecular interactions in solid benzene

abstract:
  A computational strategy for the evaluation of the crystal lattice constants
and cohesive energy of the weakly bound molecular solids is proposed. The
strategy is based on the high level ab initio coupled-cluster determination of
the pairwise additive contribution to the interaction energy. The
zero-point-energy correction and non-additive contributions to the interaction
energy are treated using density functional methods. The experimental crystal
lattice constants of the solid benzene are reproduced, and the value of 480
meV/molecule is calculated for its cohesive energy.


title: Pole Mass, Width, and Propagators of Unstable Fermions

abstract:
  The concepts of pole mass and width are extended to unstable fermions in the
general framework of parity-nonconserving gauge theories, such as the Standard
Model. In contrast with the conventional on-shell definitions, these concepts
are gauge independent and avoid severe unphysical singularities, properties of
great importance since most fundamental fermions in nature are unstable
particles. General expressions for the unrenormalized and renormalized dressed
propagators of unstable fermions and their field-renormalization constants are
presented.


title:
Brown dwarfs and very low mass stars in the Hyades cluster : a
  dynamically evolved mass function

abstract:
  We conducted a search for brown dwarfs (BDs) and very low mass (VLM) stars in
the 625 Myr-old Hyades cluster in order to derive the cluster's mass function
across the stellar-substellar boundary. We performed a deep (I=23, z=22.5)
photometric survey over 16 sq.deg. around the cluster center, followed up with
K-band photometry to measure the proper motion of candidate members, and
optical and near-IR spectroscopy of probable BD and VLM members. We report the
discovery of the first 2 brown dwarfs in the Hyades cluster. The 2 objects have
a spectral type early-T and their optical and near-IR photometry as well as
their proper motion are consistent with them being cluster members. According
to models, their mass is 50 Jupiter masses at an age of 625 Myr. We also report
the discovery of 3 new very low mass stellar members of the cluster, and
confirm the membership of 16 others. We combine these results with a list of
previously known cluster members to build the present-day mass function (PDMF)
of the Hyades cluster from 50 Jupiter masses to 3Mo. We find the Hyades PDMF to
be strongly deficient in very low mass objects and brown dwarfs compared to the
IMF of younger open clusters such as the Pleiades. We interpret this deficiency
as the result of dynamical evolution over the past few 100 Myr, i.e., the
preferential evaporation of low mass cluster members due to weak gravitational
encounters. We thus estimate that the Hyades cluster currently hosts about
10-15 brown dwarfs, while its initial substellar population may have amounted
up to 150-200 members.


title:
Reappraising Transition Region Line Widths in light of Recent Alfv\'{e}n
  Wave Discoveries

abstract:
  We provide a new interpretation of ultraviolet transition region emission
line widths observed by the SUMER instrument on the Solar and Heliospheric
Observatory (SOHO). This investigation is prompted by observations of the
chromosphere at unprecedented spatial and temporal resolution from the Solar
Optical Telescope (SOT) on Hinode revealing that all chromospheric structures
above the limb display significant transverse (Alfvenic) perturbations. We
demonstrate that the magnitude, network sensitivity and apparent center-to-limb
isotropy of the measured line widths (formed below 250,000K) can be explained
by an observationally constrained forward-model in which the line width is
caused by the line-of-sight superposition of longitudinal and Alfvenic motions
on the small-scale (spicular) structures that dominate the chromosphere and low
transition region.


title: On Multipath Fading Channels at High SNR

abstract:
  This paper studies the capacity of discrete-time multipath fading channels.
It is assumed that the number of paths is finite, i.e., that the channel output
is influenced by the present and by the L previous channel inputs. A
noncoherent channel model is considered where neither transmitter nor receiver
are cognizant of the fading's realization, but both are aware of its statistic.
The focus is on capacity at high signal-to-noise ratios (SNR). In particular,
the capacity pre-loglog - defined as the limiting ratio of the capacity to
loglog SNR as SNR tends to infinity - is studied. It is shown that,
irrespective of the number paths L, the capacity pre-loglog is 1.


title: Valence band orbital polarization in III-V ferromagnetic semiconductors

abstract:
  The element-specific technique of x-ray magnetic circular dichroism (XMCD) is
used to directly determine the magnitude and character of the valence band
orbital magnetic moments in (III,Mn)As ferromagnetic semiconductors. A distinct
dichroism is observed at the As K absorption edge, yielding an As 4p orbital
magnetic moment of around -0.1 Bohr magnetons per valence band hole. This is
strongly influenced by strain, indicating its crucial influence on the magnetic
anisotropy. The dichroism at the Ga K edge is much weaker. The K edge XMCD
signals for Mn and As both have positive sign, which indicates the important
contribution of Mn 4p states to the Mn K edge spectra.


title:
Kinematics and H_2 morphology of the multipolar Post-AGB star IRAS
  16594-4656

abstract:
  context: The spectrum of IRAS 16594-4656 shows shock excited H_2 emission and
collisionally excited emission lines such as[O I],[C I],and [Fe II]. aim: The
goal is to determine the location of the H_2 and [Fe II] shock emission, to
determine the shock velocities,and constrain the physical properties in the
shock. methods: High resolution spectra of the H_2 1-0 S(1),H_2 2-1 S(1), [Fe
II], and Pa$\beta$ emission lines were obtained with the near infrared
spectrograph Phoenix on Gemini South. results: The position-velocity diagrams
of H_2 1-0 S(1), H_2 2-1 S(1), and [Fe II] are presented. The H_2 and [Fe II]
emission is spatially extended. The collisionally excited [O I] and [C I]
optical emission lines have a similar double peaked profile compared to the
extracted H_2 profile and appear to be produced in the same shock. They all
indicate an expansion velocity of ~8 km/s and the presence of a neutral, very
high density region with $n_{\rm e}$ about 3 x 10^6 to 5 x10^7 cm$^{-3}$. The
[Fe II] emission however is single peaked. It has a gaussian FWHM of 30 km/s
and a total width of 62 km/s at 1% of the peak. The Pa$\beta$ profile is even
wider with a gaussian FWHM of 48 km/s and a total width of 75 km/s at 1% of the
peak. conclusions: The H$_2$ emission is excited in a slow 5 to 20 km/s shock
into dense material at the edge of the lobes, caused by the interaction of the
AGB ejecta and the post-AGB wind. The 3D representation of the H_2 data shows a
hollow structure with less H_2 emission in the equatorial region. The [Fe II]
emission is not present in the lobes, but originates close to the central star
in fast shocks in the post-AGB wind or in a disk. The Pa$\beta$ emission also
appears to originate close to the star.


title: QCD Calculations of Decays of Heavy Flavor Hadrons

abstract:
  Precision tests of the Standard Model and searches for New Physics in the
quark flavor sector depend on accurate theoretical calculations of decay rates
and spectra for rare, flavor-changing processes. The theoretical status and
recent developments of techniques allowing such calculations are reviewed.
Special attention is paid to the calculation of the B->Xs+gamma branching
ratio, the extraction of the b-quark mass from a fit to B->Xc+l+nu moments, and
the determination of |V(ub)| from spectra in the inclusive decay B->Xu+l+nu.
  From a reanalysis of different inclusive distributions the updated average
value |V(ub)|=(3.98+-0.15+-0.30)*10^{-3} is derived. Using only the
theoretically cleanest channels, we obtain |V(ub)|=(3.70+-0.15+-0.28)*10^{-3}.


title: Fractional Brownian motion in presence of two fixed adsorbing boundaries

abstract:
  We study the long-time asymptotics of the probability P_t that the
Riemann-Liouville fractional Brownian motion with Hurst index H does not escape
from a fixed interval [-L,L] up to time t. We show that for any H \in ]0,1],
for both subdiffusion and superdiffusion regimes, this probability obeys
\ln(P_t) \sim - t^{2 H}/L^2, i.e. may decay slower than exponential
(subdiffusion) or faster than exponential (superdiffusion). This implies that
survival probability S_t of particles undergoing fractional Brownian motion in
a one-dimensional system with randomly placed traps follows \ln(S_t) \sim -
n^{2/3} t^{2H/3} as t \to \infty, where n is the mean density of traps.


title: Finite-state concurrent programs can be expressed pairwise

abstract:
  We present a \emph{pairwise normal form} for finite-state shared memory
concurrent programs: all variables are shared between exactly two processes,
and the guards on transitions are conjunctions of conditions over this pairwise
shared state. This representation has been used to efficiently (in polynomial
time) synthesize and model-check correctness properties of concurrent programs.
Our main result is that any finite state concurrent program can be transformed
into pairwise normal form. Specifically, if $Q$ is an arbitrary finite-state
shared memory concurrent program, then there exists a finite-state shared
memory concurrent program $P$ expressed in pairwise normal form such that $P$
is strongly bisimilar to $Q$. Our result is constructive: we give an algorithm
for producing $P$, given $Q$.


title: Implementation of perception and action at nanoscale

abstract:
  Real time combination of nanosensors and nanoactuators with virtual reality
environment and multisensorial interfaces enable us to efficiently act and
perceive at nanoscale. Advanced manipulation of nanoobjects and new strategies
for scientific education are the key motivations. We have no existing intuitive
representation of the nanoworld ruled by laws foreign to our experience. A
central challenge is then the construction of nanoworld simulacrum that we can
start to visit and to explore. In this nanoworld simulacrum, object
identifications will be based on probed entity physical and chemical intrinsic
properties, on their interactions with sensors and on the final choices made in
building a multisensorial interface so that these objects become coherent
elements of the human sphere of action and perception. Here we describe a 1D
virtual nanomanipulator, part of the Cit\'e des Sciences EXPO NANO in Paris,
that is the first realization based on this program.


title: A stronger model for peg solitaire, II

abstract:
  The main problem addressed here is to decide whether it is possible or not to
go from a given position on a peg-solitaire board to another one. No
non-trivial sufficient conditions are known, but tests have been devised to
show impossibility. We expose the way these tests work in a unified formalism
and provide a new test which is strictly stronger than all previous ones.


title: Absolute Measurement of Hadronic Branching Fractions of the D_s^+ Meson

abstract:
  The branching fractions of D_s meson decays serve to normalize many
measurements of processes involving charm quarks. Using 298 /pb of e+ e-
collisions recorded at a center of mass energy of 4.17 GeV, we determine
absolute branching fractions for eight D_s decays with a double tag technique.
In particular we determine the branching fraction B(D_s -> K- K+ pi+) = (5.50
+- 0.23 +- 0.16)%, where the uncertainties are statistical and systematic
respectively. We also provide partial branching fractions for kinematic subsets
of the K- K+ pi+ decay mode.


title:
Linear and Non Linear Effects on the Newtonian Gravitational Constant as
  deduced from the Torsion Balance

abstract:
  The Newtonian gravitational constant has still 150 parts per million of
uncertainty. This paper examines the linear and nonlinear equations governing
the rotational dynamics of the torsion gravitational balance. A nonlinear
effect modifying the oscillation period of the torsion gravitational balance is
carefully explored.


title: Modulated vortex states in Rashba non-centrosymmetric superconductors

abstract:
  Vortex lattice structures to occur in Rashba non-centrosymmetric
superconductors under a magnetic field parallel to the basal plane are studied
by assuming a singlet Cooper pairing and taking account of both the
paramagnetic and orbital depairings. A vortex lattice of
Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) type with modulation perpendicular to
the field is expected to occur in the limit of vanishing ${\tilde \eta}$, where
${\tilde \eta}$ is the spin-orbit coupling {\it normalized} by Fermi energy. As
${\tilde \eta}$ increases, however, this state tends to be replaced by another
new vortex lattice with a modulation of the gap amplitude parallel to the
helical phase modulation induced by the absence of inversion symmetry.
Differences of the present results from those in the Pauli limit and a
correlation of a structural transition with the $H_{c2}(T)$-curve are discussed
in relation to possible experimental realization.


title:
A heuristic derivation of the uncertainty of the frequency determination
  in time series data

abstract:
  Context: Several approaches to estimate frequency, phase and amplitude errors
in time series analyses were reported in the literature, but they are either
time consuming to compute, grossly overestimating the error, or are based on
empirically determined criteria. Aims: A simple, but realistic estimate of the
frequency uncertainty in time series analyses. Methods: Synthetic data sets
with mono- and multi-periodic harmonic signals and with randomly distributed
amplitude, frequency and phase were generated and white noise added. We tried
to recover the input parameters with classical Fourier techniques and
investigated the error as a function of the relative level of noise, signal and
frequency difference. Results: We present simple formulas for the upper limit
of the amplitude, frequency and phase uncertainties in time-series analyses. We
also demonstrate the possibility to detect frequencies which are separated by
less than the classical frequency resolution and that the realistic frequency
error is at least 4 times smaller than the classical frequency resolution.


title: On Appell Sets and the Fueter-Sce Mapping

abstract:
  It is proved, that the recently discussed Appell polynomials in Clifford
algebras are the Fueter-Sce extension of the complex monomials z^k.
Furthermore, it is shown, for which complex functions the Fueter-Sce extension
and the extension method using Appell polynomials coincide.


title: The Goto numbers of parameter ideals

abstract:
  Let Q be a parameter ideal of a Noetherian local ring (R,m). The Goto number
g(Q) of Q is the largest integer g such that Q:m^g is integral over Q. We
examine the values of g(Q) as Q varies over the parameter ideals of R. We
concentrate mainly on the case where dim R = 1, and many of our results concern
parameter ideals of a numerical semigroup ring.


title: Classical Dynamics of the Time-Dependent Elliptical Billiard

abstract:
  In this work we study the nonlinear dynamics of the static and the driven
ellipse. In the static case, we find numerically an asymptotical algebraic
decay for the escape of an ensemble of non-interacting particles through a
small hole due to the integrable structure of the phase space of the system.
Furthermore, for a certain hole position a saturation value in the decay that
can be tuned arbitrarily by varying the eccentricity of the ellipse is observed
and explained. When applying harmonic boundary oscillations this saturation
value caused by librator type orbits is gradually destroyed via two fundamental
processes which are discussed in detail. As a result, an amplitude dependent
emission rate is obtained in the long time behavior of the decay, suggesting
that the driven elliptical billiard can be used as a controllable source of
particles.


abstract:
  We give a simple proof of Borg type uniqueness Theorems for periodic Jacobi
operators with matrix valued coefficients.


title: Quantum Mechanics with Extended Probabilities

abstract:
  The quantum mechanics of closed systems such as the universe is formulated
using an extension of familiar probability theory that incorporates negative
probabilities. Probabilities must be positive for sets of alternative histories
that are the basis of fair settleable bets. However, in quantum mechanics there
are sets of alternative histories that can be described but which cannot be the
basis for fair settleable bets. Members of such sets can be assigned extended
probabilities that are sometimes negative. A prescription for extended
probabilities is introduced that assigns extended probabilities to all
histories that can be described, fine grained or coarse grained, members of
decoherent sets or not. All probability sum rules are satisfied exactly. Sets
of histories that are recorded to sufficient precision are the basis of
settleable bets. This formulation is compared with the decoherent (consistent)
histories formulation of quantum theory. Prospects are discussed for using this
formulation to provide testable alternatives to quantum theory or further
generalizations of it.


title:
Frequency and temporal entanglement of biphoton states in spontaneous
  parametric down conversion with a short-pulse pump

abstract:
  Spectral and temporal coincidence and single-particle photon wave packets are
described and their widths and durations are found. The degree of entanglement
is characterized by the experimentally measurable parameter R defined as the
ratio of the coincidence and single-particle spectral widths. In the frequency
representation, this parameter is found as a function of the pump-pulse
duration. This function is shown to have a minimum and even in the minimum, at
rather natural conditions, the parameter R is found to be very high (R=73>>1).
The Schmidt number K is found for both short and long pump pulses and
interpolated for arbitrary pulse durations. All functional dependences of R and
K are found to be identical and numerical difference between them is shown to
be not exceeding 20%. Two-time temporal wave function of a biphoton state is
investigated in details, and a rather significant difference between the cases
of short and long pump pulses is found to occur. In the case of long pulses,
the temporal parameter R is defined as the ratio of durations of the
single-particle and coincidence signals, and the defined in such a way
parameter R is shown to be very close to the Schmidt number K.


title: Quantum bit commitment protocol without quantum memory

abstract:
  Quantum protocols for bit commitment have been proposed and it is largely
accepted that unconditionally secure quantum bit commitment is not possible;
however, it can be more secure than classical bit commitment. In despite of its
usefulness, quantum bit commitment protocols have not been experimentally
implemented. The main reason is the fact that all proposed quantum bit
commitment protocols require quantum memory. In this work, we show a quantum
bit commitment protocol that does not require quantum memory and can be
implemented with present technology.


title:
A FRAP model to investigate reaction-diffusion of proteins within a
  bounded domain: a theoretical approach

abstract:
  Temporally and spatially resolved measurements of protein transport inside
cells provide important clues to the functional architecture and dynamics of
biological systems. Fluorescence Recovery After Photobleaching (FRAP) technique
has been used over the past three decades to measure the mobility of
macromolecules and protein transport and interaction with immobile structures
inside the cell nucleus. A theoretical model is presented that aims to describe
protein transport inside the nucleus, a process which is influenced by the
presence of a boundary (i.e. membrane). A set of reaction-diffusion equations
is employed to model both the diffusion of proteins and their interaction with
immobile binding sites. The proposed model has been designed to be applied to
biological samples with a Confocal Laser Scanning Microscope (CLSM) equipped
with the feature to bleach regions characterised by a scanning beam that has a
radially Gaussian distributed profile. The proposed model leads to FRAP curves
that depend on the on- and off-rates. Semi-analytical expressions are used to
define the boundaries of on- (off-) rate parameter space in simplified cases
when molecules move within a bounded domain. The theoretical model can be used
in conjunction to experimental data acquired by CLSM to investigate the
biophysical properties of proteins in living cells.

categories: q-bio.SC physics.bio-ph q-bio.BM q-bio.QM


title: Meromorphic functions of one complex variable. A survey

abstract:
  This is an appendix to the English translation of the book by A. A. Goldberg
and I. V. Ostrovskii, Distribution of values of meromorphic functions, Moscow,
Nauka, 1970. An English translation of this book is to be published soon by the
AMS. In this appendix we survey the results obtained on the topics of the book
after 1970.


title:
Relative and absolute calibration for multi-band data collected with the
  2.2m ESO/MPI and 1.54m Danish Telescopes

abstract:
  We present the strategies adopted in the relative and absolute calibration of
two different data sets: U,B,V,I-band images collected with the Wide Field
Imager (WFI) mosaic camera mounted on the 2.2m ESO/MPI Telescope and u,v,b,y
Stroemgren images collected with the 1.54m Danish Telescope (ESO, La Silla). In
the case of the WFI camera we adopted two methods for the calibration, one for
images collected before 2002, with the ESO filters U/38_ESO841 and B/99_ESO842,
and a different one for data secured after 2002, with the filters U/50_ESO877
and B/123_ESO878. The positional and color effects turned out to be stronger
for images collected with the old filters. The eight WFI chips of these images
were corrected one by one, while in the case of images secured with the new
filters, we corrected the entire mosaic in a single step. In the case of the
Danish data set, we compared point-spread function (PSF) and aperture
photometry for each frame, finding a trend in both the X and Y directions of
the chip. The corrections resulted in a set of first and second order
polynomials to be applied to the instrumental magnitudes of each individual
frame as a function of the star position.


title: On the Higgs mechanism and the gauge field theory

abstract:
  As laboratory experiments for the detection of particles with non-zero rest
masses forming the dark matter do not give positive results we offer once more
to turn the attention upon the neutrinos background of the Universe. If the
neutrinos background has the temperature 2 K, then direct observations of
particles are impossible ones and only their high density allows hope for the
success indirect observations. In consequence of this the field theory is
constructed as the maximum plausible reduction of the Feynman formulation of
the quantum theory displaying experiment data adequately.


title: Some remarks on tangent martingale difference sequences in $L^1$-spaces

abstract:
  Let X be a Banach space. Suppose that for all $p\in (1, \infty)$ a constant
$C_{p,X}$ depending only on X and p exists such that for any two X-valued
martingales f and g with tangent martingale difference sequences one has
\[\E\|f\|^p \leq C_{p,X} \E\|g\|^p (*).\] This property is equivalent to the
UMD condition. In fact, it is still equivalent to the UMD condition if in
addition one demands that either f or g satisfy the so-called (CI) condition.
However, for some applications it suffices to assume that (*) holds whenever g
satisfies the (CI) condition. We show that the class of Banach spaces for which
(*) holds whenever only g satisfies the (CI) condition is more general than the
class of UMD spaces, in particular it includes the space L^1. We state several
problems related to (*) and other decoupling inequalities.


title:
Quantum Zero-Knowledge Protocol Using Quantum Bit Commitment without
  Quantum Memory

abstract:
  Zero-knowledge proof system is an important protocol that can be used as a
basic block for construction of other more complex cryptographic protocols.
Quantum zero-knowledge protocols have been proposed but, since their
implementation requires advanced quantum technology devices, experimental
implementation of zero-knowledge protocols have not being reported. In this
work, we present a quantum zero-knowledge protocol based on a quantum bit
commitment protocol that can be implemented with today technology. Hence, our
quantum zero-knowledge protocol can be readily implemented.


title:
Searches for the decays B0 -> l+ tau- and B+ -> l+ nu (l=e,mu) using
  hadronic tag reconstruction

abstract:
  We present searches for the leptonic decays B+ -> l+ nu and the lepton flavor
violating decays B0 -> l+ tau-, where l=e,mu, with data collected by the BaBar
experiment at SLAC. This search demonstrates a novel technique in which we
fully reconstruct the accompanying Bbar in Upsilon(4S)->BBbar events, and look
for a monoenergetic lepton from the signal B decay. The signal yield is
extracted from a fit to the signal lepton candidate momentum distribution in
the signal B rest frame. Using a data sample of approximately 378 million BBbar
pairs (342fb-1), we find no evidence of signal in any of the decay modes.
Branching fraction upper limits of B(B+ -> e+ nu)<5.2x10^-6, B(B+ -> mu+
nu)<5.6x10^-6, B(B0 -> e+ tau-)<2.8x10^-5 and B(B0 -> mu+ tau-)<2.2x10^-5, are
obtained at 90% confidence level.


title: Co-tunneling assisted sequential tunneling in multi-level quantum dots

abstract:
  We investigate the conductance and zero-frequency shot noise of interacting,
multi-level quantum dots coupled to leads. We observe that co-tunneling
assisted sequential tunneling (CAST) processes play a dominant role in the
transition region from Coulomb blockade to sequential tunneling. We analyze for
intermediate coupling strength the dependence of the conductance due to CAST
processes on temperature, coupling constant, and gate voltage. Remarkably, the
width of the CAST transport feature scales only with temperature, but not with
the coupling constant. While the onset of inelastic co-tunneling is associated
with a super-Poissonian noise, the noise is even stronger above the threshold
for CAST processes


title: Hydrodynamical activity in thin accretion disks

abstract:
  An asymptotic treatment of thin accretion disks, introduced by Klu\'zniak &
Kita (2000) for a steady-state disk flow, is extended to a time-dependent
problem. Transient growth of axisymmetric disturbances is analytically shown to
occur on the global disk scale. The implications of this result on the theory
of hydrodynamical thin accretion disks, as well as future prospects, are
discussed.


title: Proton induced spallation reactions in the energy range 0.1 - 10 GeV

abstract:
  One of considered nowadays scenarios of proton - nucleus reaction is
spallation. Its motivation is based on experimental final-state observations of
one heavy nucleus, a small number of light fragments and numerous individual
nucleons. It is theoretically described as two step process involving energy
deposition in the target nucleus and subsequent evaporation. Several models,
based on different assumptions, have been constructed in order to describe the
spallation process. The main subject of this work is description of global
average properties of proton induced spallation reactions in wide range of
projectile energy (0.1 - 10 GeV) and mass of target nuclei. This is
investigated within Hadron String Dynamics (HSD) model, based on Boltzmann -
Uehling - Uhlenbeck (BUU) equation, supplemented by a statistical evaporation
model for the second stage of the reaction. It has been shown that spallation
is the most probable scenario of proton - nucleus reaction. Proton induced
reactions, in considered here incident energy range, are visibly non-invasive
processes. Properties of residual nuclei after the first stage of the reaction
are weakly dependent on incident energy, but strongly dependent on mass of
target. The second stage of the reaction is a competition of evaporation and
fission. Results obtained from the HSD model vary smoothly as function of
proton incident energy and mass of target, so interpolation of the results is
quite feasible.


title: Adversarial Models and Resilient Schemes for Network Coding

abstract:
  In a recent paper, Jaggi et al. (INFOCOM 2007), presented a distributed
polynomial-time rate-optimal network-coding scheme that works in the presence
of Byzantine faults. We revisit their adversarial models and augment them with
three, arguably realistic, models. In each of the models, we present a
distributed scheme that demonstrates the usefulness of the model. In
particular, all of the schemes obtain optimal rate $C-z$, where $C$ is the
network capacity and $z$ is a bound on the number of links controlled by the
adversary.


title: Analysis of Lyapunov Method for Control of Quantum Systems

abstract:
  We present a detailed analysis of the convergence properties of Lyapunov
control for finite-dimensional quantum systems based on the application of the
LaSalle invariance principle and stability analysis from dynamical systems and
control theory. For a certain class of ideal Hamiltonians, convergence results
are derived both pure-state and mixed-state control, and the effectiveness of
the method for more realistic Hamiltonians is discussed.