title: The role of the extra cellular matrix on memory

abstract:
  We expose first a biological model of memory based on one hand of the
mechanical oscillations of axons during action potential and on the other hand
on the changes in the extra cellular matrix composition when a mechanical
strain is applied on it. Due to these changes, the stiffness of the extra
cellular matrix along the most excited neurons will increase close to these
neurons due to the growth of astrocytes around them and to the elastoplastic
behavior of collagen. This will create preferential paths linked to a memory
effect. In a second part, we expose a physical model based on random walk of
the action potential on the array composed of dendrites and axons. This last
model shows that repetition of the same event leads to long time memory of this
event and that paradoxical sleep leads to the linking of different events put
into memory.


title:
Deep MMT Transit Survey of the Open Cluster M37 IV: Limit on the
  Fraction of Stars With Planets as Small as 0.3 R_J

abstract:
  We present the results of a deep (15 ~< r ~< 23), 20 night survey for
transiting planets in the intermediate age open cluster M37 (NGC 2099) using
the Megacam wide-field mosaic CCD camera on the 6.5m MMT. We do not detect any
transiting planets among the ~1450 observed cluster members. We do, however,
identify a ~ 1 R_J candidate planet transiting a ~ 0.8 Msun Galactic field star
with a period of 0.77 days. The source is faint (V = 19.85 mag) and has an
expected velocity semi-amplitude of K ~ 220 m/s (M/M_J). We conduct Monte Carlo
transit injection and recovery simulations to calculate the 95% confidence
upper limit on the fraction of cluster members and field stars with planets as
a function of planetary radius and orbital period. Assuming a uniform
logarithmic distribution in orbital period, we find that < 1.1%, < 2.7% and <
8.3% of cluster members have 1.0 R_J planets within Extremely Hot Jupiter (EHJ,
0.4 < T < 1.0 day), Very Hot Jupiter (VHJ, 1.0 < T < 3.0 days) and Hot Jupiter
(HJ, 3.0 < T < 5.0 days) period ranges respectively. For 0.5 R_J planets the
limits are < 3.2%, and < 21% for EHJ and VHJ period ranges, while for 0.35 R_J
planets we can only place an upper limit of < 25% on the EHJ period range. For
a sample of 7814 Galactic field stars, consisting primarily of FGKM dwarfs, we
place 95% upper limits of < 0.3%, < 0.8% and < 2.7% on the fraction of stars
with 1.0 R_J EHJ, VHJ and HJ assuming the candidate planet is not genuine. If
the candidate is genuine, the frequency of ~ 1.0 R_J planets in the EHJ period
range is 0.002% < f_EHJ < 0.5% with 95% confidence. We place limits of < 1.4%,
< 8.8% and < 47% for 0.5 R_J planets, and a limit of < 16% on 0.3 R_J planets
in the EHJ period range. This is the first transit survey to place limits on
the fraction of stars with planets as small as Neptune.


title:
Universality of the hydrodynamic limit in AdS/CFT and the membrane
  paradigm

abstract:
  We show that at the level of linear response the low frequency limit of a
strongly coupled field theory at finite temperature is determined by the
horizon geometry of its gravity dual, i.e. by the "membrane paradigm" fluid of
classical black hole mechanics. Thus generic boundary theory transport
coefficients can be expressed in terms of geometric quantities evaluated at the
horizon. When applied to the stress tensor this gives a simple, general proof
of the universality of the shear viscosity in terms of the universality of
gravitational couplings, and when applied to a conserved current it gives a new
general formula for the conductivity. Away from the low frequency limit the
behavior of the boundary theory fluid is no longer fully captured by the
horizon fluid even within the derivative expansion; instead we find a
nontrivial evolution from the horizon to the boundary. We derive flow equations
governing this evolution and apply them to the simple examples of charge and
momentum diffusion.


title:
A library-based Monte Carlo technique enables rapid equilibrium sampling
  of a protein model with atomistic components

abstract:
  There is significant interest in rapid protein simulations because of the
time-scale limitations of all-atom methods. Exploiting the low cost and great
availability of computer memory, we report a Monte Carlo technique for
incorporating fully flexible atomistic protein components (e.g., peptide
planes) into protein models without compromising sampling speed or statistical
rigor. Building on existing approximate methods (e.g., Rosetta), the technique
uses pre-generated statistical libraries of all-atom components which are
swapped with the corresponding protein components during a simulation. The
simple model we study consists of the three all-atom backbone residues -- Ala,
Gly, and Pro -- with structure-based (Go-like) interactions. For the five
different proteins considered in this study, LBMC can generate at least 30
statistically independent configurations in about a month of single CPU time.
Minimal additional cost is required to add residue-specific interactions.


title:
Exact solutions of systems of nonlinear differential equations
  describing the evolution of interacting populations

abstract:
  The generalization of the simplest equation method to look for exact
solutions of systems of nonlinear differential equations is presented. The
exact solutions of NDE systems describing the evolution of two interacting
populations in two cases (both populations have the low critical density or low
critical density is typical for only one of populations) are obtained.


title: A criterion on instability of rotating cylindrical surfaces

abstract:
  We consider a column of a rotating stationary surface in Euclidean space. We
obtain a value $l_0>0$ in such way that if the length $l$ of column satisfies
$l>l_0$, then the surface is instable. This extends, in some sense, previous
results due to Plateau and Rayleigh for columns of surfaces with constant mean
curvature.


title: A comparison result for radial solutions of the mean curvature equation

abstract:
  We establish two comparison results between the solutions of a class of mean
curvature equations and pieces of arcs of circles that satisfy the same Neumann
boundary condition. Finally we present a number of examples where our estimates
can be applied, some of them have a physical motivation.


title: Unitary designs and codes

abstract:
  A unitary design is a collection of unitary matrices that approximate the
entire unitary group, much like a spherical design approximates the entire unit
sphere. In this paper, we use irreducible representations of the unitary group
to find a general lower bound on the size of a unitary t-design in U(d), for
any d and t. We also introduce the notion of a unitary code - a subset of U(d)
in which the trace inner product of any pair of matrices is restricted to only
a small number of distinct values - and give an upper bound for the size of a
code of degree s in U(d) for any d and s. These bounds can be strengthened when
the particular inner product values that occur in the code or design are known.
Finally, we describe some constructions of designs: we give an upper bound on
the size of the smallest weighted unitary t-design in U(d), and we catalogue
some t-designs that arise from finite groups.


title: Artinianness of local cohomology modules

abstract:
  Let $A$ be a noetherian ring, $\fa$ an ideal of $A$, and $M$ an $A$--module.
Some uniform theorems on the artinianness of certain local cohomology modules
are proven in a general situation. They generalize and imply previous results
about the artinianness of some special local cohomology modules in the graded
case.


title: Boolean Factor Congruences and Property (*)

abstract:
  A variety V has Boolean factor congruences (BFC) if the set of factor
congruences of every algebra in V is a distributive sublattice of its
congruence lattice; this property holds in rings with unit and in every variety
which has a semilattice operation. BFC has a prominent role in the study of
uniqueness of direct product representations of algebras, since it is a
strengthening of the refinement property.
  We provide an explicit Mal'cev condition for BFC. With the aid of this
condition, it is shown that BFC is equivalent to a variant of the definability
property (*), an open problem in R. Willard's work ("Varieties Having Boolean
Factor Congruences," J. Algebra, 132 (1990)).


title: Minimizers of Convex Functionals Arising in Random Surfaces

abstract:
  We investigate regularity of minimizers in two dimensions for certain classes
of non-smooth convex functionals. In particular our results apply to the
surface tensions that appear in recent works on random surfaces and random
tilings of Kenyon, Okounkov and others


title:
Effect of Night Laboratories on Learning Objectives for a Non-Major
  Astronomy Class

abstract:
  We tested the effectiveness on learning of hands-on, night-time laboratories
that challenged student misconceptions in a non-major introductory astronomy
class at Rensselaer Polytechnic Institute. We present a new assessment
examination used to assess learning in this study. We were able to increase
learning, at the 8.0 sigma level, on one of the moon phase objectives that was
addressed in a cloudy night activity. There is weak evidence of some
improvement on a broader range of learning objectives. We show evidence that
the overall achievement levels of the four sections of the class is correlated
with the amount of clear whether the sections had for observing, even though
the learning objectives were addressed primarily in activities that did not
require clear skies. This last result should be confirmed with future studies.
We describe our first attempt to cycle the students through different activity
stations in an attempt to handle 18 students at a time in the laboratories, and
lessons learned from this.


title: Stationary rotating surfaces in Euclidean space

abstract:
  A stationary rotating surface is a compact surface in Euclidean space whose
mean curvature $H$ at each point $x$ satisfies $2H(x)=a r^2+b$, where $r$ is
the distance from $x$ to a fixed straight-line $L$, and $a$ and $b$ are
constants. These surfaces are solutions of a variational problem that describes
the shape of a drop of incompressible fluid in equilibrium by the action of
surface tension when it rotates about $L$ with constant angular velocity. The
effect of gravity is neglected. In this paper we study the geometric
configurations of such surfaces, focusing the relationship between the geometry
of the surface and the one of its boundary. As special cases, we will consider
two families of such surfaces: axisymmetric surfaces and embedded surfaces with
planar boundary.


title:
Application of the Cubed-Sphere Grid to Tilted Black-Hole Accretion
  Disks

abstract:
  In recent work we presented the first results of global general relativistic
magnetohydrodynamic (GRMHD) simulations of tilted (or misaligned) accretion
disks around rotating black holes. The simulated tilted disks showed dramatic
differences from comparable untilted disks, such as asymmetrical accretion onto
the hole through opposing "plunging streams" and global precession of the disk
powered by a torque provided by the black hole. However, those simulations used
a traditional spherical-polar grid that was purposefully underresolved along
the pole, which prevented us from assessing the behavior of any jets that may
have been associated with the tilted disks. To address this shortcoming we have
added a block-structured "cubed-sphere" grid option to the Cosmos++ GRMHD code,
which will allow us to simultaneously resolve the disk and polar regions. Here
we present our implementation of this grid and the results of a small suite of
validation tests intended to demonstrate that the new grid performs as
expected. The most important test in this work is a comparison of identical
tilted disks, one evolved using our spherical-polar grid and the other with the
cubed-sphere grid. We also demonstrate an interesting dependence of the
early-time evolution of our disks on their orientation with respect to the grid
alignment. This dependence arises from the differing treatment of current
sheets within the disks, especially whether they are aligned with symmetry
planes of the grid or not.


title: Supersymmetry in Slow Motion

abstract:
  We construct new theories of electroweak symmetry breaking that employ a
combination of supersymmetry and discrete symmetries to stabilize the weak
scale up to and beyond the energies probed by the LHC. These models exhibit
conventional supersymmetric spectra but the fermion-sfermion-gaugino vertices
are absent. This closes many conventional decay channels, thereby allowing
several superpartners to be stable on collider time scales. This opens the door
to the possibility of directly observing R-hadrons and three flavors of
sleptons inside the LHC detectors.


title: Parabolic Weingarten surfaces in hyperbolic space

abstract:
  A surface in hyperbolic space $\h^3$ invariant by a group of parabolic
isometries is called a parabolic surface. In this paper we investigate
parabolic surfaces of $\h^3$ that satisfy a linear Weingarten relation of the
form $a\kappa_1+b\kappa_2=c$ or $aH+bK=c$, where $a,b,c\in \r$ and, as usual,
$\kappa_i$ are the principal curvatures, $H$ is the mean curvature and $K$ is
de Gaussian curvature. We classify all parabolic linear Weingarten surfaces in
hyperbolic space.


title: Factor Congruences in Semilattices

abstract:
  We characterize factor congruences in semilattices by using generalized
notions of order ideal and of direct sum of ideals. When the semilattice has a
minimum (maximum) element, these generalized ideals turn into ordinary (dual)
ideals.


title: Local Alignment of the BABAR Silicon Vertex Tracking Detector

abstract:
  The BABAR Silicon Vertex Tracker (SVT) is a five-layer double-sided silicon
detector designed to provide precise measurements of the position and direction
of primary tracks, and to fully reconstruct low-momentum tracks produced in
e+e- collisions at the PEP-II asymmetric collider at Stanford Linear
Accelerator Center. This paper describes the design, implementation,
performance, and validation of the local alignment procedure used to determine
the relative positions and orientations of the 340 SVT wafers. This procedure
uses a tuned mix of in-situ experimental data and complementary lab-bench
measurements to control systematic distortions. Wafer positions and
orientations are determined by minimizing a chisquared computed using these
data for each wafer individually, iterating to account for between-wafer
correlations. A correction for aplanar distortions of the silicon wafers is
measured and applied. The net effect of residual mis-alignments on relevant
physical variables is evaluated in special control samples. The BABAR
data-sample collected between November 1999 and April 2008 is used in the study
of the SVT stability.


title: Time Consistent Dynamic Limit Order Books Calibrated on Options

abstract:
  In an incomplete financial market, the axiomatic of Time Consistent Pricing
Procedure (TCPP), recently introduced, is used to assign to any financial asset
a dynamic limit order book, taking into account both the dynamics of basic
assets and the limit order books for options.
  Kreps-Yan fundamental theorem is extended to that context. A characterization
of TCPP calibrated on options is given in terms of their dual representation.
In case of perfectly liquid options, these options can be used as the basic
assets to hedge dynamically. A generic family of TCPP calibrated on option
prices is constructed, from cadlag BMO martingales.


title: Cosmological Consequences of QCD Phase Transition(s) in Early Universe

abstract:
  We discuss the cosmological consequences of QCD phase transition(s) on the
early universe. We argue that our recent knowledge about the transport
properties of quark-gluon plasma (QGP) should throw additional lights on the
actual time evolution of our universe. Understanding the nature of QCD phase
transition(s), which can be studied in lattice gauge theory and verified in
heavy ion experiments, provides an explanation for cosmological phenomenon stem
from early universe.


title:
Remarks On The Standard Hylleraas-Undheim And MacDonald Computation Of
  Excited States

abstract:
  For the computation of excited states, the standard solutions of the
Schroedinger equation, using higher roots of a secular equation in a finite
N-dimensional function space, by the Hylleraas-Undheim and MacDonald theorem,
have several restrictions, which render them of lower quality, relative to the
lowest root, if the latter is good enough. These deficiencies are reported,
that prevent from comparisons with accurate experiments.


title: Free Araki-Woods factors and Connes' bicentralizer problem

abstract:
  We show that for any free Araki-Woods factor $\mathcal{M} = \Gamma(H_\R,
U_t)"$ of type ${\rm III_1}$, the bicentralizer of the free quasi-free state
$\varphi_U$ is trivial. Using Haagerup's Theorem, it follows that there always
exists a faithful normal state $\psi$ on $\mathcal{M}$ such that
$(\mathcal{M}^\psi)' \cap \mathcal{M} = \C$.


title:
Local minimizers and low energy paths in a model of material
  microstructure with a surface energy term

abstract:
  A family of integral functionals F which, in a simplified way, model material
microstructure occupying a two-dimensional domain D and which take account of
surface energy and a variable well-depth is studied. It is shown that there is
a critical well-depth, whose scaling with the surface energy density and domain
dimensions is given, below which the state u=0 is the global minimizer of a
typical f in the class F. It is also shown that u=0 is a strict local minimizer
of f in the sense that if a non-zero v is admissible and either its L2 norm or
the meaure of the subset of D where |v_{y}| exceeds 1 is sufficiently small
(with quantitative bounds given in terms of the parameters appearing in the
energy functional f) then f(v) > f(0). Low energy paths between u=0 and the
global minimizer (in the case of a sufficiently large well-depth) are given
such that the cost of introducing small regions where |v_{y}| is larger 1
(analogous to nucleation of martensite in austenite) into the domain D can be
made arbitrarily small.


title:
Next-to-Leading-Order Corrections to Weak Boson Production with a
  Massive Quark Jet Pair at Hadron Colliders

abstract:
  We present the calculation of Next-to-Leading-Order Quantum Chromo Dynamics
corrections for the production of a W or Z weak boson associated with a bottom
anti-bottom quark pair at hadron colliders (p anti-p, pp to W/Z b anti-b),
including the effects of a non-zero bottom-quark mass. We find a considerable
reduction of the renormalization and factorization scale dependence of our
results with respect to Leading-Order calculations. In particular, we study the
impact of the corrections on the total cross section and invariant mass
distributions of the bottom anti-bottom quark pair at the Fermilab Tevatron
collider. We perform a detailed comparison with a calculation that considers
massless bottom quarks and find significant deviations in regions of phase
space with small invariant mass of the bottom anti-bottom quark pair. Our
results will be relevant to ongoing and future searches at hadron colliders, as
the W/Z b anti-b production mode is the main background to important signals,
such as light Standard Model Higgs boson production or single top-quark
production.


title: The Total Gauss Curvature of a Three-Manifold Immersed in r 4

abstract: This paper has been removed. It is already a well known result.


title:
Molecular Hydrogen in the FUSE Translucent Lines of Sight: The Full
  Sample

abstract:
  We report total abundances and related parameters for the full sample of the
FUSE survey of molecular hydrogen in 38 translucent lines of sight. New results
are presented for the "second half" of the survey involving 15 lines of sight
to supplement data for the first 23 lines of sight already published. We assess
the correlations between molecular hydrogen and various extinction parameters
in the full sample, which covers a broader range of conditions than the initial
sample. In particular, we are now able to confirm that many, but not all, lines
of sight with shallow far-UV extinction curves and large values of the
total-to-selective extinction ratio, $R_V$ = $A_V$ / $E(B-V)$ -- characteristic
of larger than average dust grains -- are associated with particularly low
hydrogen molecular fractions ($f_{\rm H2}$). In the lines of sight with large
$R_V$, there is in fact a wide range in molecular fractions, despite the
expectation that the larger grains should lead to less H$_2$ formation.
However, we see specific evidence that the molecular fractions in this
sub-sample are inversely related to the estimated strength of the UV radiation
field and thus the latter factor is more important in this regime. We have
provided an update to previous values of the gas-to-dust ratio, $N$(H$_{\rm
tot}$)/$E(B-V)$, based on direct measurements of $N$(H$_2$) and $N$(H I).
Although our value is nearly identical to that found with Copernicus data, it
extends the relationship by a factor of 2 in reddening. Finally, as the new
lines of sight generally show low to moderate molecular fractions, we still
find little evidence for single monolithic "translucent clouds" with $f_{\rm
H2}$ $\sim$ 1.


title: The X-ray Cluster Normalization of the Matter Power Spectrum

abstract:
  The number density of galaxy clusters provides tight statistical constraints
on the matter fluctuation power spectrum normalization, traditionally phrased
in terms of sigma_8, the root mean square mass fluctuation in spheres with
radius 8 h^-1 Mpc. We present constraints on sigma_8 and the total matter
density Omega_m0 from local cluster counts as a function of X-ray temperature,
taking care to incorporate and minimize systematic errors that plagued previous
work with this method. In particular, we present new determinations of the
cluster luminosity - temperature and mass - temperature relations, including
their intrinsic scatter, and a determination of the Jenkins mass function
parameters for the same mass definition as the mass - temperature calibration.
Marginalizing over the 12 uninteresting parameters associated with this method,
we find that the local cluster temperature function implies sigma_8
(Omega_m0/0.32)^alpha = 0.86+/-0.04 with alpha = 0.30 (0.41) for Omega_m0 <
0.32 (Omega_mo > 0.32) (68% confidence for two parameters). This result agrees
with a wide range of recent independent determinations, and we find no evidence
of any additional sources of systematic error for the X-ray cluster temperature
function determination of the matter power spectrum normalization. The joint
WMAP5 + cluster constraints are: Omega_m0 = 0.30+0.03/-0.02 and sigma_8 =
0.85+0.04/-0.02 (68% confidence for two parameters).


title:
On solutions to the non-Abelian Hirota-Miwa equation and its continuum
  limits

abstract:
  In this paper, we construct grammian-like quasideterminant solutions of a
non-Abelian Hirota-Miwa equation. Through continuum limits of this non-Abelian
Hirota-Miwa equation and its quasideterminant solutions, we construct a cascade
of noncommutative differential-difference equations ending with the
noncommutative KP equation. For each of these systems the quasideterminant
solutions are constructed as well.


title:
Measurement of B- -> tau- nu_tau-bar Decay With a Semileptonic Tagging
  Method

abstract:
  We present a new measurement of the decay B- -> tau- nu_tau-bar with a
semileptonic B tagging method, using a data sample containing 657*10^6 BB-bar
pairs collected at the (4S) resonance with the Belle detector at the KEKB
asymmetric e+e- collider. A sample of BB pairs are tagged by reconstructing one
B meson decaying semileptonically. We detect the B- -> tau- nu_tau-bar
candidate in the recoil. We obtain a signal with a signicance of 3.8 standard
deviations including systematics, and measure the branching fraction to be B(B-
-> tau- nu_tau-bar)=(1.65+0.38-0.37(stat)+0.35-0.37(syst))*10^4. This result
confirms the evidence for B- -> tau- nu_tau-bartained in the previous Belle
measurement with a hadronic B tagging method.


title: Introduction to scattering for radial 3D NLKG below energy norm

abstract:
  We prove scattering for the radial nonlinear Klein-Gordon equation $
\partial_{tt} u - \Delta u + u = -|u|^{p-1} u $ with $5 > p >3$ and data $
(u_{0}, u_{1}) \in H^{s} \times H^{s-1} $, $ 1 > s > 1-
\frac{(5-p)(p-3)}{2(p-1)(p-2)} $ if $ 4 \geq p > 3 $ and $ 1 > s > 1 -
\frac{(5-p)^{2}}{2(p-1)(6-p)}$ if $ 5> p \geq 4$. First we prove
Strichartz-type estimates in $ L_{t}^{q} L_{x}^{r} $ spaces. Then by using
these decays we establish some local bounds. By combining these results with a
Morawetz-type estimate and a radial Sobolev inequality we control the variation
of an almost conserved quantity on arbitrarily large intervals. Once we have
showed that this quantity is controlled, we prove that some of these local
bounds can be upgraded to global bounds. This is enough to establish
scattering. All the estimates involved require a delicate analysis due to the
nature of the nonlinearity and the lack of scaling.


title:
Ground state and edge excitations of quantum Hall liquid at filling
  factor 2/3

abstract:
  We present a numerical study of fractional quantum Hall liquid at Landau
level filling factor $\nu=2/3$ in a microscopic model including long-range
Coulomb interaction and edge confining potential, based on the disc geometry.
We find the ground state is accurately described by the particle-hole conjugate
of a $\nu=1/3$ Laughlin state. We also find there are two counter-propagating
edge modes, and the velocity of the forward-propagating mode is larger than the
backward-propagating mode. The velocities have opposite responses to the change
of the background confinement potential. On the other hand changing the
two-body Coulomb potential has qualitatively the same effect on the velocities;
for example we find increasing layer thickness (which softens of the Coulomb
interaction) reduces both the forward mode and the backward mode velocities.


title:
Generalized Solutions of a Nonlinear Parabolic Equation with Generalized
  Functions as Initial Data

abstract:
  In \cite{bf} Br\'ezis and Friedman prove that certain nonlinear parabolic
equations, with the $\delta$-measure as initial data, have no solution. However
in \cite{cl} Colombeau and Langlais prove that these equations have a unique
solution even if the $\delta$-measure is substituted by any Colombeau
generalized function of compact support. Here we generalize Colombeau and
Langlais their result proving that we may take any generalized function as the
initial data. Our approach relies on resent algebraic and topological
developments of the theory of Colombeau generalized functions and results from
\cite{A}.


title: Dynamics of Black Hole Pairs I: Periodic Tables

abstract:
  Although the orbits of comparable mass, spinning black holes seem to defy
simple decoding, we find a means to decipher all such orbits. The dynamics is
complicated by extreme perihelion precession compounded by spin-induced
precession. We are able to quantitatively define and describe the fully three
dimensional motion of comparable mass binaries with one black hole spinning and
expose an underlying simplicity. To do so, we untangle the dynamics by
capturing the motion in the orbital plane. Our results are twofold: (1) We
derive highly simplified equations of motion in a non-orthogonal orbital basis,
and (2) we define a complete taxonomy for fully three-dimensional orbits. More
than just a naming system, the taxonomy provides unambiguous and quantitative
descriptions of the orbits, including a determination of the zoom-whirliness of
any given orbit. Through a correspondence with the rationals, we are able to
show that zoom-whirl behavior is prevalent in comparable mass binaries in the
strong-field regime. A first significant conclusion that can be drawn from this
analysis is that all generic orbits in the final stages of inspiral under
gravitational radiation losses are characterized by precessing clovers with few
leaves and that no orbit will behave like the tightly precessing ellipse of
Mercury. The gravitational waveform produced by these low-leaf clovers will
reflect the natural harmonics of the orbital basis -- harmonics that,
importantly, depend only on radius. The significance for gravitational wave
astronomy will depend on the number of windings the pair executes in the
strong-field regime and could be more conspicuous for intermediate mass pairs
than for stellar mass pairs.


title: Centimeter Polarimetry of the R Coronae Australis Region

abstract:
  Circularly polarized 3.5 cm continuum emission was detected toward three
radio sources in the R CrA region using the Very Large Array. The Class I
protostar IRS 5b persistently showed polarized radio emission with a constant
helicity over 8 yr, which suggests that its magnetosphere has a stable
configuration. There is a good correlation between the Stokes I and Stokes V
fluxes, and the fractional polarization is about 0.17. During active phases the
fractional polarization is a weakly decreasing function of Stokes I flux, which
suggests that IRS 5b is phenomenologically similar to other types of flare
stars such as RS CVn binaries. The variability timescale of the polarized flux
is about a month, and the magnetosphere of IRS 5b must be very large in size.
The Class I protostar IRS 7A was detected once in circularly polarized radio
emission, even though IRS 7A drives a thermal radio jet. This detection implies
that the radio emission from the magnetosphere of a young protostar can escape
the absorption by the partially ionized wind at least once in a while. The
properties of IRS 7A and IRS 5b suggests that Class I protostars have organized
peristellar magnetic fields of a few kilogauss and that the detectability of
magnetospheric emission may depend on the evolutionary status of protostar.
Also reported is the detection of circularly polarized radio emission toward
the variable radio source B5.


title: Cryogenic Double Beta Decay Experiments: CUORE and CUORICINO

abstract:
  Cryogenic bolometers, with their excellent energy resolution, flexibility in
material, and availability in high purity, are excellent detectors for the
search for neutrinoless double beta decay. Kilogram-size single crystals of
TeO_2 are utilized in CUORICINO for an array with a total detector mass of 40.7
kg. CUORICINO currently sets the most stringent limit on the halflife of Te-130
of T > 2.4x10^{24} yr (90% C.L.), corresponding to a limit on the effective
Majorana neutrino mass in the range of < 0.2-0.9 eV. Based on technology
developed for CUORICINO and its predecessors, CUORE is a next-generation
experiment designed to probe neutrino mass in the range of 10 - 100 meV. Latest
results from CUORICINO and overview of the progress and current status of CUORE
are presented.


title:
High-subwavelength-resolution imaging of multilayered structures
  consisting of alternating negative-permittivty and dielectric layers with
  flattened transmission curves

abstract:
  Multilayered structures consisting of alternating negative-permittivity and
dielectric layers are explored to obtain high-resolution imaging of
subwavelength objects. The peaks with the smallest |ky| (ky is the transverse
wave vector) on the transmission curves, which come from the guided modes of
the multilayered structures, can not be completely damped by material loss.
This makes the amplitudes of the evanescent waves around these peaks
inappropriate after transmitted through the imaging structures, and the imaging
quality is not good. To solve such a problem, the permittivity of the
dielectric layers is appropriately chosen to make these sharp peaks merge with
their neighboring peaks. Wide flat upheavals are then generated on the
transmission curves so that evanescent waves in a large range are transmitted
through the structures with appropriate amplitudes. In addition, it is found
that the sharp peaks with the smallest |ky| can be eliminated by adding
appropriate coating layers and wide flat upheavals can also be obtained.


title:
Directional spatial structure of dissociated elongated molecular
  condensates

abstract:
  Ultra-cold clouds of dimeric molecules can dissociate into quantum
mechanically correlated constituent atoms that are either bosons or fermions.
We theoretically model the dissociation of cigar shaped molecular condensates,
for which this difference manifests as complementary geometric structures of
the dissociated atoms. For atomic bosons beams form along the long axis of the
molecular condensate. For atomic fermions beams form along the short axis. This
directional beaming simplifies the measurement of correlations between the
atoms through relative number squeezing.


title: X-ray absorption branching ratio in actinides: LDA+DMFT approach

abstract:
  To investigate the x-ray absorption (XAS) branching ratio from the core 4d to
valence 5f states, we set up a theoretical framework by using a combination of
density functional theory in the local density approximation and Dynamical Mean
Field Theory (LDA+DMFT), and apply it to several actinides. The results of the
LDA+DMFT reduces to the band limit for itinerant systems and to the atomic
limit for localized f electrons, meaning a spectrum of 5f itinerancy can be
investigated. Our results provides a consistent and unified view of the XAS
branching ratio for all elemental actinides, and is in good overall agreement
with experiments.


title: Model Waveform Accuracy Standards for Gravitational Wave Data Analysis

abstract:
  Model waveforms are used in gravitational wave data analysis to detect and
then to measure the properties of a source by matching the model waveforms to
the signal from a detector. This paper derives accuracy standards for model
waveforms which are sufficient to ensure that these data analysis applications
are capable of extracting the full scientific content of the data, but without
demanding excessive accuracy that would place undue burdens on the model
waveform simulation community. These accuracy standards are intended primarily
for broad-band model waveforms produced by numerical simulations, but the
standards are quite general and apply equally to such waveforms produced by
analytical or hybrid analytical-numerical methods.


title: Multiplicity results for the assigned Gauss curvature problem in R2

abstract:
  To study the problem of the assigned Gauss curvature with conical
singularities on Riemanian manifolds, we consider the Liouville equation with a
single Dirac measure on the two-dimensional sphere. By a stereographic
projection, we reduce the problem to a Liouville equation on the euclidean
plane. We prove new multiplicity results for bounded radial solutions, which
improve on earlier results of C.-S. Lin and his collaborators. Based on
numerical computations, we also present various conjectures on the number of
unbounded solutions. Using symmetries, some multiplicity results for non radial
solutions are also stated.


title: Still states of bistable lattices, compatibility, and phase transition

abstract:
  A two-dimensional bistable lattice is a periodic triangular network of
non-linear bi-stable rods. The energy of each rod is piecewise quadratic and
has two minima. Consequently, a rod undergoes a reversible phase transition
when its elongation reaches a critical value. We study an energy minimization
problem for such lattices. The objective is to characterize the effective
energy of the system when the number of nodes in the network approaches
infinity. The most important feature of the effective energy is its "flat
bottom". This means that the effective energy density is zero for all strains
inside a certain three-dimensional set in the strain space. The flat bottom
occurs because the microscopic discrete model has a large number of deformed
states that carry no forces. We call such deformations still states. In the
paper, we present a complete characterization of the "flat bottom" set in terms
of the parameters of the network. This is done by constructing a family of
still states whose average strains densely fill the set in question.
  The two-dimensional case is more difficult than the previously studied case
of one-dimensional chains, because the elongations in two-dimensional networks
must satisfy certain compatibility conditions that do not arise in the
one-dimensional case. We derive these conditions for small and arbitrary
deformations. For small deformations a complete analysis is provided.


title: Cosmological evolution of interacting dark energy in Lorentz violation

abstract:
  The cosmological evolution of an interacting scalar field model in which the
scalar field interacts with dark matter, radiation, and baryon via Lorentz
violation is investigated. We propose a model of interaction through the
effective coupling $\bar{\beta}$. Using dynamical system analysis, we study the
linear dynamics of an interacting model and show that the dynamics of critical
points are completely controlled by two parameters. Some results can be
mentioned as follows. Firstly, the sequence of radiation, the dark matter, and
the scalar field dark energy exist and baryons are sub dominant. Secondly, the
model also allows the possibility of having a universe in the phantom phase
with constant potential. Thirdly, the effective gravitational constant varies
with respect to time through $\bar{\beta}$. In particular, we consider a simple
case where $\bar{\beta}$ has a quadratic form and has a good agreement with the
modified $\Lambda$CDM and quintessence models. Finally, we also calculate the
first post--Newtonian parameters for our model.


title: Guaranteed discovery of the NmSuGra model

abstract:
  We analyze the discovery potential of the next-to-minimal supergravity
motivated model: NmSuGra. This model is an extension of mSuGra by a gauge
singlet, and contains only one additional parameter: lambda, the
Higgs-singlet-Higgs coupling. NmSuGra solves the mu-problem and reduces the
fine tuning of mSuGra.
  After identifying parameter space regions preferred by present experimental
data, we show that these regions of NmSuGra are amenable to detection by the
combination of the Large Hadron Collider and an upgraded Cryogenic Dark Matter
Search.
  This conclusion holds strictly provided that the more than three sigma
discrepancy in the difference of the experimental and the standard theoretical
values of the anomalous magnetic moment of the muon prevails in the future.


title:
Spectropolarimetric Observations of Herbig Ae/Be Stars. II. Comparison
  of Spectropolarimetric Surveys: HAeBe, Be and Other Emission-Line Stars

abstract:
  The polarization of light across individual spectral lines contains
information about the circumstellar environment on very small spatial scales.
We have obtained a large number of high precision, high resolution
spectropolarimetric observations of Herbig Ae/Be, Classical Be and other
emission-line stars collected on 117 nights of observations with the HiVIS
spectropolarimeter at a resolution of R=13000 on the 3.67m AEOS telescope. We
also have many observations from the ESPaDOnS spectropolarimeter at a
resolution of R=68000 on the 3.6m CFH telescope. In roughly ~2/3 of the
so-called "windy" or "disky" Herbig Ae/Be stars, the detected H-alpha linear
polarization varies from our typical detection threshold near 0.1% to over 2%.
In all but one HAe/Be star the detected polarization effect is not coincident
with the H-alpha emission peak but is detected in and around the obvious
absorptive part of the line profile. The qu-loops are dominated by the
polarization in this absorptive region. In several stars the polarization
varies in time mostly in the absorptive component and is not necessarily tied
to corresponding variations in intensity. This is a new result not seen at
lower resolution. In the Be and emission-line stars, 10 out of a sample of 30
show a typical broad depolarization effect but 4 of these 10 show weaker
effects only visible at high resolution. Another 5 of 30 show smaller
amplitude, more complex signatures. Six stars of alternate classification
showed large amplitude (1-3%) absorptive polarization effects. These detections
are largely inconsistent with the traditional disk-scattering and
depolarization models.


title: Black holes and black hole thermodynamics without event horizons

abstract:
  We investigate whether black holes can be defined without using event
horizons. In particular we focus on the thermodynamic properties of event
horizons and the alternative, locally defined horizons. We discuss the
assumptions and limitations of the proofs of the zeroth, first and second laws
of black hole mechanics for both event horizons and trapping horizons. This
leads to the possibility that black holes may be more usefully defined in terms
of trapping horizons. We also show how Hawking radiation can also be seen to
arise from trapping horizons and discuss which horizon area should be
associated with the gravitational entropy.


title: First order metal-insulator transision in band overlap mechanism

abstract:
  We present a method to analyze the metal-insulator transition (MIT) due to
the band overlap mechanism. It is based on a model with the knowledge of the
homogeneous electron gas, combined with results based on the quasiparticle
self-consistent $GW$ method. Because of the long-range nature of the Coulomb
interaction, the MIT occurs as the first-order phase transition, that is, the
band gap becomes negative (band overlap) suddenly at some critical lattice
constant.


title:
Continuous-discrete integrable equations and Darboux transformations as
  deformations of associative algebras

abstract:
  Deformations of the structure constants for a class of associative
noncommutative algebras generated by Deformation Driving Algebras (DDA's) are
defined and studied. These deformations are governed by the Central System
(CS). Such a CS is studied for the case of DDA being the algebra of shifts.
Concrete examples of deformations for the three-dimensional algebra governed by
discrete and mixed continuous-discrete Boussinesq (BSQ) and WDVV equations are
presented. It is shown that the theory of the Darboux transformations, at least
for the BSQ case, is completely incorporated into the proposed scheme of
deformations.


title: Properties of Koszul homology modules

abstract:
  We investigate various module-theoretic properties of Koszul homology under
mild conditions. These include their depth, $S_2$-property and their Bass
numbers


title:
Tetrahedron Diagram and Perturbative Calculation in Chern-Simons-Witten
  Theory

abstract:
  We investigate extended Wilson loop operators, in particular tetrahedron
operator in (2 + 1)-dimensional Chern-Simons-Witten theory. This operator
emerges naturally from the contribution terms in twoparticle scattering
amplitude. We evaluate this diagram non-perturbatively in terms of vacuum
expectation values of Wilson loop operators, especially for gauge group SU(N)
with specific choices of representations. On the other hand, we also discuss
the perturbative calculation of vacuum expectation value in this theory. We
show that, up to the third order, this values of unknotted Wilson loop
operators are identical to the non-perturbative result.


title:
Slow-light enhanced light-matter interactions with applications to gas
  sensing

abstract:
  Optical gas detection in microsystems is limited by the short micron scale
optical path length available. Recently, the concept of slow-light enhanced
absorption has been proposed as a route to compensate for the short path length
in miniaturized absorption cells. We extend the previous perturbation theory to
the case of a Bragg stack infiltrated by a spectrally strongly dispersive gas
with a narrow and distinct absorption peak. We show that considerable signal
enhancement is possible. As an example, we consider a Bragg stack consisting of
PMMA infiltrated by O2. Here, the required optical path length for visible to
near-infrared detection (~760 nm) can be reduced by at least a factor of 10^2,
making a path length of 1 mm feasible. By using this technique, optical gas
detection can potentially be made possible in microsystems.


title: Density-functional fidelity approach to quantum phase transitions

abstract:
  We propose a new approach to quantum phase transitions in terms of the
density-functional fidelity, which measures the similarity between density
distributions of two ground states in parameter space. The key feature of the
approach, as we will show, is that the density-functional fidelity can be
measured easily in experiments. Both the validity and versatility of the
approach are checked by the Lipkin-Meshkov-Glick model and the one-dimensional
Hubbard model.


title: Excited Hyperons Produced in Proton-Proton Collisions with Anke@COSY

abstract:
  Excited neutral hyperons Y0* produced in the pp -> p K+ Y0* reaction with a
COSY beam momentum of 3.65 MeV/c have masses below 1540 MeV/c2. The ANKE
spectrometer allows the simultaneous observation of different decay modes: Y0*
-> pion0Sigma0, pion+-Sigma-+, pion0Lambda, K-p by measuring kaons and pions of
either charge in coincidence with protons. We have found indications for a
neutral excited hyperon resonance Y0* with a mass of (1480 +- 15) MeV/c2 and a
width of (60 +- 15) MeV/c2. The cross section for Y0* is of the order of few
hundred nanobarns. It can be either a Sigma0 or a Lambda hyperon and on the
basis of existing data no conclusion could be made whether it is a three-quark
baryon or an exotic state. Missing- and invariant-mass techniques have been
used to identify the Lambda(1405) resonance decaying via Sigma0pion0. The cross
section for Lambda(1405) production is equal to (4.5 +- 0.9(stat) +- 1.8(syst))
microbarn. The shape and position of the Lambda(1405) distribution are similar
to those found from other decay modes, so no support is given to the two-pole
model.


title:
No anomalous scaling in electrostatic calibrations for Casimir force
  measurements

abstract:
  In a recent paper (Phys.Rev.A78, 020101(R) (2008)), Kim at al. have reported
a large anomaly in the scaling law of the electrostatic interaction between a
sphere and a plate, which was observed during the calibration of their Casimir
force set-up. Here we experimentally demonstrate that in proper electrostatic
calibrations the scaling law follows the behavior expected from elementary
electrostatic arguments, even when the electrostatic voltage that one must
apply to minimize the force (typically ascribed to contact potentials) depends
on the separation between the surfaces.


title:
Electrical detection of spin pumping: dc voltage generated by
  ferromagnetic resonance at ferromagnet/nonmagnet contact

abstract:
  We describe electrical detection of spin pumping in metallic nanostructures.
In the spin pumping effect, a precessing ferromagnet attached to a normal-metal
acts as a pump of spin-polarized current, giving rise to a spin accumulation.
The resulting spin accumulation induces a backflow of spin current into the
ferromagnet and generates a dc voltage due to the spin dependent conductivities
of the ferromagnet. The magnitude of such voltage is proportional to the
spin-relaxation properties of the normal-metal. By using platinum as a contact
material we observe, in agreement with theory, that the voltage is
significantly reduced as compared to the case when aluminum was used.
Furtheremore, the effects of rectification between the circulating rf currents
and the magnetization precession of the ferromagnet are examined. Most
significantly, we show that using an improved layout device geometry these
effects can be minimized.


title: A note on ccc forcings

abstract:
  The aim of this short note is to communicate a simple solution to the problem
posed in [1] as Question 7.2.7: is it true that for every ccc $\sigma$-ideal I
any I-positive Borel set contains modulo I an I-positive closed set?


title:
Boundary driven waveguide arrays: Supratransmission and saddle-node
  bifurcation

abstract:
  In this report, we consider a semi-infinite discrete nonlinear Schr\"odinger
equation driven at one edge by a driving force. The equation models the
dynamics of coupled waveguide arrays. When the frequency of the forcing is in
the allowed-band of the system, there will be a linear transmission of energy
through the lattice. Yet, if the frequency is in the upper forbidden band, then
there is a critical driving amplitude for a nonlinear tunneling, which is
called supratransmission, of energy to occur. Here, we discuss mathematically
the mechanism and the source of the supratransmission. By analyzing the
existence and the stability of the rapidly decaying static discrete solitons of
the system, we show rigorously that two of the static solitons emerge and
disappear in a saddle-node bifurcation at a critical driving amplitude. One of
the emerging solitons is always stable in its existence region and the other is
always unstable. We argue that the critical amplitude for supratransmission is
then the same as the critical driving amplitude of the saddle-node bifurcation.
We consider as well the case of the forcing frequency in the lower forbidden
band. It is discussed briefly that there is no supratransmission because in
this case there is only one rapidly decaying static soliton that exists and is
stable for any driving amplitude.


title:
Extrasolar planets and brown dwarfs around A-F type stars V. A planetary
  system found with HARPS around the F6IV-V star HD 60532

abstract:
  Aims: In the frame of the search for extrasolar planets and brown dwarfs
around early-type stars, we present the results obtained for the F-type
main-sequence star HD 60532 (F6V) with HARPS.
  Methods: Using 147 spectra obtained with HARPS at La Silla on a time baseline
of two years, we study the radial velocities of this star.
  Results: HD 60532 radial velocities are periodically variable, and the
variations have a Keplerian origin. This star is surrounded by a planetary
system of two planets with minimum masses of 1 and 2.5 Mjup and orbital
separations of 0.76 and 1.58 AU respectively. We also detect high-frequency,
low-amplitude (10 m/s peak-to-peak) pulsations. Dynamical studies of the system
point toward a possible 3:1 mean-motion resonance which should be confirmed
within the next decade.


title:
Exciton storage in a nano-scale Aharonov-Bohm ring with electric field
  tuning

abstract:
  We study analytically the optical properties of a simple model for an
electron-hole pair on a ring subjected to perpendicular magnetic flux and
in-plane electric field. We show how to tune this excitonic system from
optically active to optically dark as a function of these external fields. Our
results offer a simple mechanism for exciton storage and read-out.


title: Towards printed magnetic sensors based on organic diodes

abstract:
  We report the study of magnetotransport properties of regio-regular poly
(3-hexyl thiophene) based organic diodes. The devices were fabricated using two
different techniques of spin coating and inkjet printing. Positive
magnetoresistance (MR) effect was observed at room temperature in all the
devices. The highest MR magnitude reached up to 16% for some spin-coated
devices and up to 10% in inkjet printed devices. The MR magnitude and line
shapes were found to depend strongly on the measuring current. We observed
deviation from the theoretically predicted Lorentzian or non-Lorentzian line
shape of the MR traces, which is discussed in detail in the article. Although,
the printed devices exhibit MR response as high as for the spin coated ones,
they still need to be optimized in terms of performance and yield for large
scale applications as magnetic sensors.


title: Photonic crystal resonator integrated in a microfluidic system

abstract:
  We report on a novel optofluidic system consisting of a silica-based 1D
photonic crystal, integrated planar waveguides and electrically insulated
fluidic channels. An array of pillars in a microfluidic channel designed for
electrochromatography is used as a resonator for on-column label-free
refractive index detection. The resonator was fabricated in a silicon
oxynitride platform, to support electroosmotic flow, and operated at 1.55
microns. Different aqueous solutions of ethanol with refractive indices ranging
from n = 1.3330 to 1.3616 were pumped into the column/resonator and the
transmission spectra were recorded. Linear shifts of the resonant wavelengths
yielded a maximum sensitivity of 480 nm/RIU and a minimum difference of 0.007
RIU was measured.


title:
Semileptonic $B_{q}\to D^{\ast}_{q}l\nu $ $(q=s, d, u)$ transitions in
  QCD

abstract:
  The form factors relevant to $B_{q}\to D^{\ast}_{q}(J^{P}=1^{-})\ell\nu$
$(q=s, d, u)$ decays are calculated in the framework of the three point QCD sum
rules approach. The heavy quark effective theory prediction of the form factors
are obtained. The total decay width and branching ratio for these decays are
also evaluated using the $q^2$ dependencies of these form factors.


title:
Gravitational energy in a small region for the modified Einstein and
  Landau-Lifshitz pseudotensors

abstract:
  The purpose of the classical Einstein and Landau-Lifshitz pseudotensors is
for determining the gravitational energy. Neither of them can guarantee a
positive energy in holonomic frames. In the small sphere approximation, it has
been required that the quasilocal expression for the gravitational
energy-momentum density should be proportional to the Bel-Robinson tensor
$B_{\alpha\beta\mu\nu}$. However, we propose a new tensor
$V_{\alpha\beta\mu\nu}$ which is the sum of certain tensors
$S_{\alpha\beta\mu\nu}$ and $K_{\alpha\beta\mu\nu}$, it has certain properties
so that it gives the same gravitational "energy-momentum" content as
$B_{\alpha\beta\mu\nu}$ does. Moreover, we show that a modified Einstein
pseudotensor turns out to be one of the Chen-Nester quasilocal expressions,
while the modified Landau-Lifshitz pseudotensor becomes the Papapetrou
pseudotensor; these two modified pseudotensors have positive gravitational
energy in a small region.


title:
Gravitational energy in small regions for the quasilocal expressions in
  orthonormal frames

abstract:
  The M$\o$ller tetrad gravitational energy-momentum expression was recently
evaluated for a small vacuum region using orthonormal frames adapted to Riemann
normal coordinates. However the result was not proportional to the Bel-Robinson
tensor $B_{\alpha\beta\mu\nu}$. Treating a modified quasilocal expressions in a
similar way, we found one unique combination that gives a multiple of
$B_{\alpha\beta\mu\nu}$ which provides a non-negative gravitational
energy-momentum in the small sphere approximation. Moreover, in addition to
$B_{\alpha\beta\mu\nu}$, we found a certain tensor
$S_{\alpha\beta\mu\nu}+K_{\alpha\beta\mu\nu}$ which gives the same
"energy-momentum" density in vacuum. Using this tensor combination, we obtained
an infinite set of solutions that provides a positive gravitational energy
within the same limit.


title:
A class of unbiased location invariant Hill-type estimators for heavy
  tailed distributions

abstract:
  Based on the methods provided in Caeiro and Gomes (2002) and Fraga Alves
(2001), a new class of location invariant Hill-type estimators is derived in
this paper. Its asymptotic distributional representation and asymptotic
normality are presented, and the optimal choice of sample fraction by Mean
Squared Error is also discussed for some special cases. Finally comparison
studies are provided for some familiar models by Monte Carlo simulations.


title: Super G-spaces

abstract:
  We review the basic theory of super $G$-spaces. We prove a theorem relating
the action of a super Harish-Chandra pair $(G_0, \mathfrak{g})$ on a
supermanifold to the action of the corresponding super Lie group $G$. The
theorem was stated in [DM99] without proof. The proof given here does not use
Frobenius theorem but relies on Koszul realization of the structure sheaf of a
super Lie group (see [Kosz83]). We prove the representability of the stability
subgroup functor.


title:
Localized magnetorotational instability and its role in the accretion
  disc dynamo

abstract:
  (Abriged) The magnetorotational instability (MRI) is believed to be an
efficient way to transport angular momentum in accretion discs. It has also
been suggested as a way to amplify magnetic fields in discs, the instability
acting as a nonlinear dynamo. Recent numerical work has shown that a
large-scale magnetic field, which is predominantly azimuthal, can be sustained
by motions driven by the MRI of this same field. Following this idea, we
present an analytical calculation of the MRI in the presence of an azimuthal
field with a non-trivial vertical structure. We find that the mean radial EMF
associated to MRI modes tends to reduce the magnetic energy, acting like a
turbulent resistivity by mixing the non-uniform azimuthal field. Meanwhile, the
azimuthal EMF generates a radial field that, in combination with the Keplerian
shear, tends to amplify the azimuthal field and can therefore assist in the
dynamo process. This effect, however, is reversed for sufficiently strong
azimuthal fields, naturally leading to a saturation of the dynamo and possibly
to a cyclic behaviour of the magnetic field, as found in previous numerical
works.


title:
Measurement of CP violation phase phi_s and charge asymmetries in
  B^0_(s) decays at D0

abstract:
  The CP violation phase phi_s and charge asymmetries in B^0_s decays have been
measured by the D0 experiment in Run II of the Fermilab Tevatron Collider where
proton anti-proton collisions take place at a center of mass energy of
sqrt{s}=1.96 TeV. The measurements are based on integrated luminosities between
1.0 fb^-1 and 2.8 fb^-1. A 1.8 sigma deviation from the Standard Model is
observed in the measurement of the CP violation phase
phi_s=-0.57^{+0.24}_{-0.30} (stat) ^{+0.07}_{-0.02} (syst) rad in the decay
channel B^0_s -> J/psi phi. A combination with CDF results yields a 2.2 sigma
deviation from the Standard Model.


title: Gluon Propagator and Heavy Quark Potential in an Anisotropic QCD Plasma

abstract:
  The hard-loop resummed propagator in an anisotropic QCD plasma in general
linear gauges are computed. We get the explicit expressions of the gluon
propagator in covariant gauge, Coulomb gauge and temporal axial gauge.
Considering one gluon exchange, the potential between heavy quarks is defined
through the Fourier transform of the static propagator. We find that the
potential exhibits angular dependence and that there is stronger attraction on
distance scales on the order of the inverse Debye mass for quark pairs aligned
along the direction of anisotropy than for transverse alignment.


title:
Universal linear-temperature dependence of static magnetic
  susceptibility in iron-pnictides

abstract:
  A universal linear-temperature dependence of the uniform magnetic
susceptibility has been observed in the nonmagnetic normal state of
iron-pnictides. This non-Pauli and non-Curie-Weiss-like paramagnetic behavior
cannot be understood within a pure itinerant picture. We argue that it results
from the existence of a wide antiferromagnetic fluctuation window in which the
local spin-density-wave correlations exist but the global directional order has
not been established yet.


title: On spectral minimal partitions II, the case of the rectangle

abstract:
  In continuation of \cite{HHOT}, we discuss the question of spectral minimal
3-partitions for the rectangle $]-\frac a2,\frac a2[\times ] -\frac b2,\frac
b2[ $, with $0< a\leq b$. It has been observed in \cite{HHOT} that when
$0<\frac ab < \sqrt{\frac 38}$ the minimal 3-partition is obtained by the three
nodal domains of the third eigenfunction corresponding to the three rectangles
$]-\frac a2,\frac a2[\times ] -\frac b2,-\frac b6[$, $]-\frac a2,\frac
a2[\times ] -\frac b6,\frac b6[$ and $]-\frac a2,\frac a2[\times ] \frac b6,
\frac b2[$. We will describe a possible mechanism of transition for increasing
$\frac ab$ between these nodal minimal 3-partitions and non nodal minimal
3-partitions at the value $ \sqrt{\frac 38}$ and discuss the existence of
symmetric candidates for giving minimal 3-partitions when $ \sqrt{\frac
38}<\frac ab \leq 1$. Numerical analysis leads very naturally to nice questions
of isospectrality which are solved by introducing Aharonov-Bohm Hamiltonians or
by going on the double covering of the punctured rectangle.


title: The role of curvature and stretching in dynamo plasmas

abstract:
  Vishik's antidynamo theorem is applied to non-stretched twisted magnetic flux
tube in Riemannian space. Marginal or slow dynamos along curved (folded),
torsioned (twisted) and non-stretching flux tubes plasma flows are obtained}.
Riemannian curvature of twisted magnetic flux tube is computed in terms of the
Frenet curvature in the thin tube limit. It is shown that, for non-stretched
filaments fast dynamo action in diffusive case cannot be obtained, in agreement
with Vishik's argument, that fast dynamo cannot be obtained in non-stretched
flows. \textbf{In this case a non-uniform stretching slow dynamo is
obtained}.\textbf{An example is given which generalizes plasma dynamo laminar
flows, recently presented by Wang et al [Phys Plasmas (2002)], in the case of
low magnetic Reynolds number $Re_{m}\ge{210}$. Curved and twisting Riemannian
heliotrons, where non-dynamo modes are found even when stretching is presented,
shows that the simple presence of stretching is not enough for the existence of
dynamo action. Folding is equivalent to Riemann curvature and can be used to
cancell magnetic fields, not enhancing the dynamo action. In this case
non-dynamo modes are found for certain values of torsion or Frenet curvature
(folding) in the spirit of anti-dynamo theorem. It is shown that curvature and
stretching are fundamental for the existence of fast dynamos in plasmas.


title: An optimal network for passenger traffic

abstract:
  The optimal solution of an inter-city passenger transport network has been
studied using Zipf's law for the city populations and the Gravity law
describing the fluxes of inter-city passenger traffic. Assuming a fixed value
for the cost of transport per person per kilometer we observe that while the
total traffic cost decreases, the total wiring cost increases with the density
of links. As a result the total cost to maintain the traffic distribution is
optimal at a certain link density which vanishes on increasing the network
size. At a finite link density the network is scale-free. Using this model the
air-route network of India has been generated and an one-to-one comparison of
the nodal degree values with the real network has been made.


title: F-Theory, GUTs and Chiral Matter

abstract:
  This is a write-up of a two hour talk at the Simons workshop. It contains an
elementary introduction to F-theory and may be useful for people new to the
subject.


title: The low-lying Scalar Mesons and Related Topics

abstract:
  After presenting the motivations to explore the low-lying scalar mesons such
as the $\sigma$, $a_0$ and $\kappa$ in the unquenched as well as quenched
lattice QCD, we review the works done by our collaboration (SCALAR
Collaboration) with a what-to-do-next list. We briefly mention the imporatance
to explore the $N_c$ dependence of and possible effects of the $U_A(1)$ anomaly
to the properties the low-lying scalar mesons.


title: Light Vector Mesons

abstract:
  This article reviews the current status of experimental results obtained in
the measurement of light vector mesons produced in proton-proton and heavy ion
collisions at different energies. The review is focused on two phenomena
related to the light vector mesons; the modification of the spectral shape in
search of Chiral symmetry restoration and suppression of the meson production
in heavy ion collisions. The experimental results show that the spectral shape
of light vector mesons are modified compared to the parameters measured in
vacuum. The nature and the magnitude of the modification depends on the energy
density of the media in which they are produced. The suppression patterns of
light vector mesons are different from the measurements of other mesons and
baryons. The mechanisms responsible for the suppression of the mesons are not
yet understood. Systematic comparison of existing experimental results points
to the missing data which may help to resolve the problem.


title: RCF2: Evaluation and Consistency

abstract:
  We construct here an iterative evaluation of all PR map codes: progress of
this iteration is measured by descending complexity within "Ordinal" O :=
N[\omega] of polynomials in one indeterminate, ordered lexicographically.
Non-infinit descent of such iterations is added as a mild additional axiom
schema (\pi_O) to Theory PR_A = PR+(abstr) of Primitive Recursion with
predicate abstraction, out of forgoing part RCF 1. This then gives (correct)
"on"-termination of iterative evaluation of argumented deduction trees as well,
for theories PR_A+(\pi_O). By means of this constructive evaluation the Main
Theorem is proved, on Termination-conditioned (Inner) Soundness for such
theories, Ordinal O extending N[\omega]. As a consequence we get
Self-Consistency for these theories, namely derivation of its own free-variable
Consistency formula.
  As to expect from classical setting, Self-Consistency gives (unconditioned)
Objective Soundness. Termination-Conditioned Soundness holds "already" for
PR_A, but it turns out that at least present derivation of Consistency from
this conditioned Soundness depends on schema (\pi_O) of non-infinit descent in
Ordinal O := \N[\omega].


title: Analysis of complete positivity conditions for quantum qutrit channels

abstract:
  We present an analysis of complete positivity (CP) constraints on qutrit
quantum channels that have a form of affine transformations of generalized
Bloch vector. For diagonal (damping) channels we derive conditions analogous to
the ones that in qubit case produce tetrahedron structure in the channel
parameter space.


title:
Hidden local symmetry and the reaction e^+e^-\to\pi^+\pi^-\pi^+\pi^- at
  energies \sqrt{s}\leq 1 GeV

abstract:
  Based on the generalized hidden local symmetry as the chiral model of
pseudoscalar, vector, and axial vector mesons, the excitation curve of the
reaction e^+e^-\to\pi^+\pi^-\pi^+\pi^- is calculated for energies in the
interval 0.65\leq \sqrt{s}\leq1 GeV. The theoretical predictions are compared
to available data of CMD-2 and BaBaR. It is shown that the inclusion of heavy
isovector resonances \rho(1450) and \rho(1700) is necessary for reconciling
calculations with the data. It is found that at \sqrt{s}\approx1 GeV the
contributions of the above resonances are much larger, by the factor of 30,
than the \rho(770) one, and are amount to a considerable fraction \sim0.3-0.6
of the latter at \sqrt{s}\sim m_\rho.


title:
On the geometry of the normal bundle with a metric of Cheeger-Gromoll
  type

abstract:
  We investigate the geometry of a normal bundle equipped with a
$(p,q)$-metric, i.e., Riemannian metric of Cheeger-Gromoll type, to the
submanifold of a Riemannian manifold. We derive all natural object as the
Levi-Civita connection, curvature tensor, sectional and scalar curvature. We
prove that under some natural conditions the sectional curvature of this bundle
may be bounded from below by given arbitrary large positive constant. Next we
investigate $(p,q)$-metrics from the complex geometry point of view. We show
when the normal bundle can by equipped with a structure of almost Hermitian,
almost K\"ahlerian, conformally almost K\"ahlerian or K\"ahlerian manifold.


title: Convectively driven vortex flows in the Sun

abstract:
  We have discovered small whirlpools in the Sun, with a size similar to the
terrestrial hurricanes (<~0.5 Mm). The theory of solar convection predicts
them, but they had remained elusive so far. The vortex flows are created at the
downdrafts where the plasma returns to the solar interior after cooling down,
and we detect them because some magnetic bright points (BPs) follow a
logarithmic spiral in their way to be engulfed by a downdraft. Our disk center
observations show 0.009 vortexes per Mm^2, with a lifetime of the order of 5
min, and with no preferred sense of rotation. They are not evenly spread out
over the surface, but they seem to trace the supergranulation and the
mesogranulation. These observed properties are strongly biased by our type of
measurement, unable to detect vortexes except when they are engulfing magnetic
BPs.


title:
Soft processes at high energy without soft Pomeron: a QCD motivated
  model

abstract:
  In this paper we develop a QCD motivated model for both hard and soft
interactions at high energies. In this model the long distance behavior of the
scattering amplitude is determined by the approximate solution to the
non-linear evolution equation for parton system in the saturation domain. All
phenomenological parameters for dipole-proton interaction were fitted from the
deep inelastic scattering data and the soft processes are described with only
one new parameter, related to the wave function of hadron. It turns out that we
do not need to introduce the so called soft Pomeron that has been used in high
energy phenomenology for four decades. The model described all data on soft
interactions: the values of total, elastic and diffractive cross sections as
well as their $s$ and $t$ behavior. The value for the survival probability of
the diffractive Higgs production is calculated being less 1% for the LHC energy
range.


title: Bars driven by the Cosmology in stellar-gaseous disks

abstract:
  We present the first attempt to analyse the growth of the bar instability in
stellar-gaseous disks evolving in a fully consistent cosmological scenario. We
explored the role of the cosmology on pure stellar disks with different mass
embedded in a cosmological dark matter halo. We deepened such a study by
analysing the impact of different gas fractions and of the star formation
onset.
  We found that in all these cases, the stellar bar arising inside the less
massive disks, i.e., dark matter (DM)-dominated disks, is still living at
redshift zero even if the gas fraction exceeds half of the disk mass. Such a
bar is a genuine product of the cosmology. However, in the most massive disks
there is a threshold value for their gas percentage and lower limit for the
central gas concentration able to destroy the bar when the star formation rate
is switched off. On the other hand in the simulations with star formation the
central mass concentration of gas and of the new stars has a mild action on the
ellipticity of the bar but is not able to destroy it; at z=0 the stellar bar
strength is enhanced by the star formation. Even if our results qualitatively
agree with the classical ones, i.e. with criteria concerning bar instability
derived outside the cosmological framework, the same criteria cannot be
validated for the DM-dominated disks.


title: The bremsstrahlung equation for the spin motion in LHC

abstract:
  The influence of the bremsstrahlung on the spin motion is expressed by the
equation which is the analogue and generalization of the
Bargmann-Michel-Telegdi equation. The new constant is involved in this
equation. This constant can be immediately determined by the experimental
measurement of the spin motion, or it follows from the classical limit of
quantum electrodynamics with radiative corrections.


title: Decoherence of a Macroscopic Quantum Superposition

abstract:
  The high resilience to de-coherence shown by a recently discovered
Macroscopic Quantum Superposition (MQS) involving a number of photons in excess
of 5 x 10^4 motivates the present theoretical and numerical investigation. The
results are placed in close comparison with the properties of the well known
MQS based on |alpha> states. The very critical decoherence properties of the
latter MQS are found to be fully accounted for, in a direct a simple way, by a
unique "universal" function: indeed a new property of the quantum "coherent
states".


title: Optimizing the green-field beta beam: Small versus large theta_13

abstract:
  We discuss the optimization of a green-field beta beam in terms of baseline,
boost factor, luminosity, and isotope pair used. We identify two qualitatively
different cases: theta_13 not discovered at the time a decision has to be made
(theta_13 small), and theta_13 discovered at that time (theta_13 large). For
small theta_13, it turns out that the obtainable sensitivity is essentially a
matter of the effort one is willing to spend. For large theta_13, however, one
can find clear optimization criteria, and one can use the information on
theta_13 obtained until then.


title: Entanglement in the adiabatic limit of a two-atom Tavis-Cummings model

abstract:
  We study the adiabatic limit for the sequential passage of atoms through a
high-Q cavity, in the presence of frequency chirps. Despite the fact that the
adiabatic approximation might be expected to fail, we were able to show that
for proper choice of Stark-pulses this is not the case. Instead, a connection
to the resonant limit is established, where the robust creation of entanglement
is demonstrated. Recent developments in the fabrication of high-Q cavities
allow fidelities for a maximally entangled state up to 97%.


title: Vector bundles on Sasakian manifolds

abstract:
  We investigate the analog of holomorphic vector bundles in the context of
Sasakian manifolds.


title:
The impossibility of heavy neutrino dark matter in the Littlest Higgs
  Model with T-parity: constraints from direct search

abstract:
  We consider the Littlest Higgs Model with T-parity (LHT), in the parameter
region where a heavy neutrino is the lightest T-odd particle (LTP). Having
emphasized that this corresponds to a sizable region in the parameter space of
the theory, we show that both the Cryogenic Dark Matter Search (CDMS) and
Xenon10 experiments disallow the entire region where the masses of the new
particles in LHT can lie within several TeV. Therefore, any observation of the
signals of a heavy neutrino LTP is likely to seriously reopen the issue of cold
dark matter in the universe.


title:
A search for a dark matter annihilation signal towards the Canis Major
  overdensity with H.E.S.S

abstract:
  A search for a dark matter (DM) annihilation signal into $\gamma$-rays toward
the direction of the Canis Major (CMa) overdensity is presented. The nature of
CMa is still controversial and one scenario represents it as a dwarf galaxy,
making it an interesting candidate for DM annihilation searches. A total of 9.6
hours of high quality data were collected with the H.E.S.S. array of Imaging
Atmospheric Cherenkov Telescopes (IACTs) and no evidence for a very high energy
$\gamma$-ray signal is found. Upper limits on the CMa dwarf galaxy mass of the
order of 10$^{9}$ M$_{\odot}$ are derived at the 95% C.L. assuming neutralino
masses in the range 500 GeV - 10 TeV and relatively large annihilation
cross-sections. Constraints on the velocity-weighted annihilation cross section
$<\sigma v>$, are calculated for specific WIMP scenarios, using a NFW model for
the DM halo profile and taking advantage of numerical simulations of
hierarchical structure formation. 95% C.L. exclusion limits of the order of 5
$\times$ 10$^{-24}$ cm$^{3}$ s$^{-1}$ are reached in the 500 GeV - 10 TeV DM
particle mass interval, assuming a total halo mass of 3 $\times$ 10$^{8}$
M$_{\odot}$.


title: Q-balls, Integrability and Duality

abstract:
  This paper is concerned with the dynamics and interactions of Q-balls in
(1+1)-dimensions. The asymptotic force between well-separated Q-balls is
calculated to show that Q-balls can be attractive or repulsive depending upon
their relative internal phase. An integrable model with exact multi-Q-ball
solutions is investigated and found to be of use in explaining the dynamics in
non-integrable theories. In particular, it is demonstrated that the dynamics of
small Q-balls in a generic class of non-integrable models tends towards
integrable dynamics as the charge decreases. Long-lived oscillations of a
single Q-ball can also be understood in terms of a deformation of an exact
breather solution in the integrable model. Finally, we show that any theory
with Q-ball solutions has a dual description in which a stationary Q-ball is
dual to a static kink, with an interchange of Noether and topological charges.


title: Radio Bursts Associated with Flare and Ejecta in the 13 July 2004 Event

abstract:
  We investigate coronal transients associated with a GOES M6.7 class flare and
a coronal mass ejection (CME) on 13 July 2004. During the rising phase of the
flare, a filament eruption, loop expansion, a Moreton wave, and an ejecta were
observed. An EIT wave was detected later on. The main features in the radio
dynamic spectrum were a frequency-drifting continuum and two type II bursts.
Our analysis shows that if the first type II burst was formed in the low
corona, the burst heights and speed are close to the projected distances and
speed of the Moreton wave (a chromospheric shock wave signature). The
frequency-drifting radio continuum, starting above 1 GHz, was formed almost two
minutes prior to any shock features becoming visible, and a fast-expanding
piston (visible as the continuum) could have launched another shock wave. A
possible scenario is that a flare blast overtook the earlier transient, and
ignited the first type II burst. The second type II burst may have been formed
by the same shock, but only if the shock was propagating at a constant speed.
This interpretation also requires that the shock-producing regions were located
at different parts of the propagating structure, or that the shock was passing
through regions with highly different atmospheric densities. This complex
event, with a multitude of radio features and transients at other wavelengths,
presents evidence for both blast-wave-related and CME-related radio emissions.


title:
Cosmological constant and quantum gravitational corrections to the
  running fine structure constant

abstract:
  The quantum gravitational contribution to the renormalization group behavior
of the electric charge in Einstein-Maxwell theory with a cosmological constant
is considered. Quantum gravity is shown to lead to a contribution to the
running charge not present when the cosmological constant vanishes. This
re-opens the possibility, suggested by Robinson and Wilczek, of altering the
scaling behaviour of gauge theories at high energies although our result
differs. We show the possibility of an ultraviolet fixed point that is linked
directly to the cosmological constant.


title:
Resonance-like phenomena of the mobility of a chain of nonlinear coupled
  oscillators in a two-dimensional periodic potential

abstract:
  We study the Langevin dynamics of a two-dimensional discrete oscillator chain
absorbed on a periodic substrate and subjected to an external localized point
force. Going beyond the commonly used harmonic bead-spring model, we consider a
nonlinear Morse interaction between the next-nearest-neighbors. We focus
interest on the activation of directed motion instigated by thermal
fluctuations and the localized point force. In this context the local
transition states are identified and the corresponding activation energies are
calculated. As a novel feature it is found that the transport of the chain in
point force direction is determined by stepwise escapes of a single unit or
segments of the chain due to the existence of multiple locally stable
attractors. The non-vanishing net current of the chain is quantitatively
assessed by the value of the mobility of the center of mass. It turns out that
the latter as a function of the ratio of the competing length scales of the
system, that is the period of the substrate potential and the equilibrium
distance between two chain units, shows a resonance behavior. More precisely
there exist a set of optimal parameter values maximizing the mobility.
Interestingly, the phenomenon of negative resistance is found, i.e. the
mobility possesses a minimum at a finite value of the strength of the thermal
fluctuations for a given overcritical external driving force.


title: Lenard scheme for two dimensional periodic Volterra chain

abstract:
  We prove that for compatible weakly nonlocal Hamiltonian and symplectic
operators, hierarchies of infinitely many commuting local symmetries and
conservation laws can be generated under some easily verified conditions no
matter whether the generating Nijenhuis operators are weakly nonlocal or not.
We construct a recursion operator of the two dimensional periodic Volterra
chain from its Lax representation and prove that it is a Nijenhuis operator.
Furthermore we show this system is a (generalised) bi-Hamiltonian system.
Rather surprisingly, the product of its weakly nonlocal Hamiltonian and
symplectic operators gives rise to the square of the recursion operator.


title: On aberration in gravitational lensing

abstract:
  It is known that a relative translational motion between the deflector and
the observer affects gravitational lensing. In this paper, a lens equation is
obtained to describe such effects on actual lensing observables. Results can be
easily interpreted in terms of aberration of light-rays. Both radial and
transverse motions with relativistic velocities are considered. The lens
equation is derived by first considering geodesic motion of photons in the
rest-frame Schwarzschild spacetime of the lens, and, then, light-ray detection
in the moving observer's frame. Due to the transverse motion images are
displaced and distorted in the observer's celestial sphere, whereas the radial
velocity along the line of sight causes an effective re-scaling of the lens
mass. The Einstein ring is distorted to an ellipse whereas the caustics in the
source plane are still point-like. Either for null transverse motion or up to
linear order in velocities, the critical curve is still a circle with its
radius corrected by a factor (1+z_d) with respect to the static case, z_d being
the relativistic Doppler shift of the deflector. From the observational point
of view, the orbital motion of the Earth can cause potentially observable
corrections of the order of the microarcsec in lensing towards the
super-massive black hole at the Galactic center. On a cosmological scale,
tangential peculiar velocities of cluster of galaxies bring about a typical
flexion in images of background galaxies in the weak lensing regime but future
measurements seem to be too much challenging.


title: Application of the Lifshitz theory to poor conductors

abstract:
  The Lifshitz formula for the dispersive forces is generalized to the
materials, which cannot be described with the local dielectric response.
Principal nonlocality of poor conductors is related with the finite screening
length of the penetrating field and the collisional relaxation; at low
temperatures the role of collisions plays the Landau damping. The spatial
dispersion makes the theory self consistent. Our predictions are compared with
the recent experiment. It is demonstrated that at low temperatures the
Casimir-Lifshitz entropy disappears as $T$ in the case of degenerate plasma and
as $T^2$ for the nondegenerate one.


title: Clustering of discretely observed diffusion processes

abstract:
  In this paper a new dissimilarity measure to identify groups of assets
dynamics is proposed. The underlying generating process is assumed to be a
diffusion process solution of stochastic differential equations and observed at
discrete time. The mesh of observations is not required to shrink to zero. As
distance between two observed paths, the quadratic distance of the
corresponding estimated Markov operators is considered. Analysis of both
synthetic data and real financial data from NYSE/NASDAQ stocks, give evidence
that this distance seems capable to catch differences in both the drift and
diffusion coefficients contrary to other commonly used metrics.


title:
Superlattice properties of semiconductor nanohelices in a transverse
  electric field

abstract:
  A charge carrier confined in a quasi-one-dimensional semiconductor helical
nanostructure in the presence of an electric field normal to the axis of the
helix is subjected to a periodic potential proportional to the strength of the
field and the helix radius. As a result, electronic properties of such
nanohelices are similar to those of semiconductor superlattices with parameters
controlled by the applied field. These properties include Bragg scattering of
charge carriers by a periodic potential, which results in energy gap opening at
the edge of the superlattice Brillouin zone. This provides an opportunity for
creating a new class of tunable high-frequency devices based on semiconductor
nanohelices.


title: Charge Detection in Graphene Quantum Dots

abstract:
  We report measurements on a graphene quantum dot with an integrated graphene
charge detector. The quantum dot device consists of a graphene island (diameter
approx. 200 nm) connected to source and drain contacts via two narrow graphene
constrictions. From Coulomb diamond measurements a charging energy of 4.3 meV
is extracted. The charge detector is based on a 45 nm wide graphene nanoribbon
placed approx. 60 nm from the island. We show that resonances in the nanoribbon
can be used to detect individual charging events on the quantum dot. The
charging induced potential change on the quantum dot causes a step-like change
of the current in the charge detector. The relative change of the current
ranges from 10% up to 60% for detecting individual charging events.


title:
Ab initio exchange interactions and magnetic properties of Gd2Fe17 iron
  sublattice: rhombohedral vs. hexagonal phases

abstract:
  In the framework of the LSDA+U method electronic structure and magnetic
properties of the intermetallic compound Gd2Fe17 for both rhombohedral and
hexagonal phases have been calculated. On top of that, ab initio exchange
interaction parameters within the Fe sublattice for all present nearest and
some next nearest Fe ions have been obtained. It was found that for the first
coordination sphere direct exchange interaction is ferromagnetic. For the
second coordination sphere indirect exchange interaction is observed to be
weaker and of antiferromagnetic type. Employing the theoretical values of
exchange parameters Curie temperatures Tc of both hexagonal and rhombohedral
phases of Gd2Fe17 within Weiss mean-field theory were estimated. Obtained
values of Tc and its increase going from the hexagonal to rhombohedral crystal
structure of Gd2Fe17 agree well with experiment. Also for both structures
LSDA+U computed values of total magnetic moment coincide with experimental
ones.


title:
Dark matter scaling relations and the assembly epoch of Coma early-type
  galaxies

abstract:
  Axisymmetric, orbit-based dynamical models are used to derive dark matter
scaling relations for Coma early-type galaxies. From faint to bright galaxies
halo core-radii and asymptotic circular velocities increase. Compared to
spirals of the same brightness, the majority of Coma early-types -- those with
old stellar populations -- have similar halo core-radii but more than 2 times
larger asymptotic halo velocities. The average dark matter density inside 2
reff decreases with increasing luminosity and is 6.8 times larger than in disk
galaxies of the same B-band luminosity. Compared at the same stellar mass, dark
matter densities in ellipticals are 13.5 times higher than in spirals.
Different baryon concentrations in ellipticals and spirals cannot explain the
higher dark matter density in ellipticals. Instead, the assembly redshift (1+z)
of Coma early-type halos is likely about two times larger than of comparably
bright spirals. Assuming that local spirals typically assemble at a redshift of
one, the majority of bright Coma early-type galaxy halos must have formed
around z = 2-3. For about half of our Coma galaxies the assembly redshifts
match with constraints derived from stellar populations. We find dark matter
densities and estimated assembly redshifts of our observed Coma galaxies in
reasonable agreement with recent semi-analytic galaxy formation models.


title:
Third-generation cylindrical dendrimers based on L-aspargic acid in
  solutions: hydrodynamic and electrooptical properties

abstract:
  Samples of third-generation cylindrical dendrimers with molar masses ranging
in the interval 20000...60000 have been studied by the methods of equilibrium
and non-equilibrium electrical birefringence, molecular hydrodynamics and
optics. It was found that the absolute values of Kerr and flow birefringence
constants exceed the values obtained for analogous dendrimers of lower
generations. The mechanism of reorientation has proven to be strongly dependent
on the physical and chemical properties of the solvent. In chloroform
solutions, the studied dendrimers align to the microwave-frequency electric
fields according to large-scale mechanism. In dichloroacetic acid solutions,
the observed reorientation mechanism is low-scale, which is explained by
degradation of intermolecular hydrogen bonds. Terminal dendritic substituents
of the macromolecules have experimentally proven to be oriented mainly along
the primary polymer chain.


title: Optimal Energy Management Policies for Energy Harvesting Sensor Nodes

abstract:
  We study a sensor node with an energy harvesting source. The generated energy
can be stored in a buffer. The sensor node periodically senses a random field
and generates a packet. These packets are stored in a queue and transmitted
using the energy available at that time. We obtain energy management policies
that are throughput optimal, i.e., the data queue stays stable for the largest
possible data rate. Next we obtain energy management policies which minimize
the mean delay in the queue.We also compare performance of several easily
implementable sub-optimal energy management policies. A greedy policy is
identified which, in low SNR regime, is throughput optimal and also minimizes
mean delay.


title:
The effects of primordial non-Gaussianity on the cosmological
  reionization

abstract:
  We investigate the effects of non-Gaussianity in the primordial density field
on the reionization history. We rely on a semi-analytic method to describe the
processes acting on the intergalactic medium (IGM), relating the distribution
of the ionizing sources to that of dark matter haloes. Extending previous work
in the literature, we consider models in which the primordial non-Gaussianity
is measured by the dimensionless non-linearity parameter f_NL, using the
constraints recently obtained from cosmic microwave background data. We predict
the ionized fraction and the optical depth at different cosmological epochs
assuming two different kinds of non-Gaussianity, characterized by a
scale-independent and a scale-dependent f_NL and comparing the results to those
for the standard Gaussian scenario. We find that a positive f_NL enhances the
formation of high-mass haloes at early epochs, when reionization begins, and,
as a consequence, the IGM ionized fraction can grow by a factor up to 5 with
respect to the corresponding Gaussian model. The increase of the filling factor
has a small impact on the reionization optical depth and is of order ~ 10 per
cent if a scale-dependent non-Gaussianity is assumed. Our predictions for
non-Gaussian models are in agreement with the latest WMAP results within the
error bars, but a higher precision is required to constrain the scale
dependence of non-Gaussianity.


title:
A globally accelerated numerical method for optical tomography with
  continuous wave source

abstract:
  A new numerical method for an inverse problem for an elliptic equation with
unknown potential is proposed. In this problem the point source is running
along a straight line and the source-dependent Dirichlet boundary condition is
measured as the data for the inverse problem. A rigorous convergence analysis
shows that this method converges globally, provided that the so-called tail
function is approximated well. This approximation is verified in numerical
experiments, so as the global convergence. Applications to medical imaging,
imaging of targets on battlefields and to electrical impedance tomography are
discussed.


title:
Maximal monotonicity, conjugation and the duality product in
  non-reflexive Banach spaces

abstract:
  Maximal monotone operators on a Banach space into its dual can be represented
by convex functions bounded below by the duality product. It is natural to ask
under which conditions a convex function represents a maximal monotone
operator. A satisfactory answer, in the context of reflexive Banach spaces, has
been obtained some years ago. Recently, a partial result on non-reflexive
Banach spaces was obtained.
  In this work we study some others conditions which guarantee that a convex
function represents a maximal monotone operator in non-reflexive Banach spaces.


title:
Monitoring the radio spectra of selected blazars in the Fermi-GST era.
  The Effelsberg 100 m telescope covering the cm band

abstract:
  The analysis of the spectral energy distribution variability at frequencies
from radio to TeV is a powerful tool in the investigation of the dynamics, the
physics and the structure evolution occurring in the most exotic flavour of
active galaxies, the blazars. In particular, the presence of {\sl Fermi-GST} is
providing a unique opportunity for such studies delivering $\gamma$-ray data of
unprecedented quality. Here we introduce a monitoring program that has been
running at the Effelsberg 100m telescope since January 2007, underpinning a
broad multi-frequency collaboration of facilities that cover the band from
radio to infrared. Sixty one selected blazars are observed monthly between 2.64
GHz and 43 GHz. The calibration accuracy is better than a few percent as it is
demonstrated with some preliminary examples.


title: Fast-Light in a Photorefractive Crystal for Gravitational Wave Detection

abstract:
  We demonstrate superluminal light propagation using two frequency multiplexed
pump beams to produce a gain doublet in a photorefractive crystal of Ce:BaTiO3.
The two gain lines are obtained by two-wave mixing between a probe field and
two individual pump fields. The angular frequencies of the pumps are
symmetrically tuned from the frequency of the probe. The frequency difference
between the pumps corresponds to the separation of the two gain lines; as it
increases, the crystal gradually converts from normal dispersion without
detuning to an anomalously dispersive medium. The time advance is measured as
0.28 sec for a pulse propagating through a medium with a 2Hz gain separation,
compared to the same pulse propagating through empty space. We also demonstrate
directly anomalous dispersion profile using a modfied experimental
configuration. Finally, we discuss how anomalous dispersion produced this way
in a faster photorefractive crystal (such as SPS: Sn2P2S6) could be employed to
enhance the sensitivity-bandwidth product of a LIGO type gravitational wave
detector augmented by a White Light Cavity.


title: Accreting White Dwarfs

abstract:
  Thermonuclear (type Ia) supernovae are explosions in accreting white dwarfs,
but the exact scenario leading to these explosions is still unclear. An
important step to clarify this point is to understand the behaviour of
accreting white dwarfs in close binary systems. The characteristics of the
white dwarf (mass, chemical composition, luminosity), the accreted material
(chemical composition) and those related with the properties of the binary
system (mass accretion rate), are crucial for the further evolution towards the
explosion. An analysis of the outcome of accretion and the implications for the
growth of the white dwarf towards the Chandrasekhar mass and its thermonuclear
explosion is presented.


title: Punctuated inflation and the low CMB multipoles

abstract:
  We investigate inflationary scenarios driven by a class of potentials which
are similar in form to those that arise in certain minimal supersymmetric
extensions of the standard model. We find that these potentials allow a brief
period of departure from inflation sandwiched between two stages of slow roll
inflation. We show that such a background behavior leads to a step like feature
in the scalar power spectrum. We set the scales such that the drop in the power
spectrum occurs at a length scale that corresponds to the Hubble radius
today--a feature that seems necessary to explain the lower power observed in
the quadrupole moment of the Cosmic Microwave Background (CMB) anisotropies. We
perform a Markov Chain Monte Carlo analysis to determine the values of the
model parameters that provide the best fit to the recent WMAP 5-year data for
the CMB angular power spectrum. We find that an inflationary spectrum with a
suppression of power at large scales that we obtain leads to a much better fit
(with just one extra parameter, $\chi_{\rm eff}^{2}$ improves by 6.62) of the
observed data when compared to the best fit reference $\Lambda$CDM model with a
featureless, power law, primordial spectrum.


title:
Coagulation of small grains in disks: the influence of residual infall
  and initial small-grain content

abstract:
  Turbulent coagulation in protoplanetary disks is known to operate on
timescale far shorter than the lifetime of the disk. In the absence of
mechanisms that replenish the small dust grain population, protoplanetary disks
would rapidly lose their continuum opacity-bearing dust. This is inconsistent
with infrared observations of disks around T Tauri stars and Herbig Ae/Be
stars, which are usually optically thick at visual wavelengths and show
signatures of small (a<~ 3um) grains. A plausible replenishing mechanism of
small grains is collisional fragmentation or erosion of large dust aggregates,
which model calculations predict to play an important role in protoplanetary
disks. If optically thick disks are to be seen as proof for ongoing
fragmentation or erosion, then alternative explanations for the existence of
optically thick disks must be studied carefully. In this study we explore two
scenarios. First, we study the effect of residual, low-level infall of matter
onto the disk surface. We find that infall rates as low as 10^{-11} Msun/yr
can, in principle, replenish the small grain population to a level that keeps
the disk marginally optically thick. However, it remains to be seen if the
assumption of such inflow is realistic for star+disk systems at the age of
several Myrs, at which winds and jets are expected to have removed any residual
envelope. In summary, fragmentation or erosion still appear to be the most
promising processes to explain the abundant presence of small grains in old
disks.