title:
The inner Cauchy horizon of axisymmetric and stationary black holes with
  surrounding matter

abstract:
  We investigate the interior of regular axisymmetric and stationary black
holes surrounded by matter and find that for non-vanishing angular momentum of
the black hole the space time can always be extended regularly up to and
including an inner Cauchy horizon. We provide an explicit relation for the
regular metric at the inner Cauchy horizon in terms of that at the event
horizon. As a consequence, we obtain the universal equality $(8\pi J)^2 = A^+
A^-$ where $J$ is the black hole's angular momentum and $A^-$ and $A^+$ denote
the horizon areas of inner Cauchy and event horizon, respectively. We also find
that in the limit $J \to 0$ the inner Cauchy horizon becomes singular.


title: Nucleosynthesis in Electron Capture Supernovae of AGB Stars

abstract:
  We examine nucleosynthesis in the electron capture supernovae of progenitor
AGB stars with an O-Ne-Mg core (with the initial stellar mass of 8.8 M_\odot).
Thermodynamic trajectories for the first 810 ms after core bounce are taken
from a recent state-of-the-art hydrodynamic simulation. The presented
nucleosynthesis results are characterized by a number of distinct features that
are not shared with those of other supernovae from the collapse of stars with
iron core (with initial stellar masses of more than 10 M_\odot). First is the
small amount of 56Ni (= 0.002-0.004 M_\odot) in the ejecta, which can be an
explanation for observed properties of faint supernovae such as SNe 2008S and
1997D. In addition, the large Ni/Fe ratio is in reasonable agreement with the
spectroscopic result of the Crab nebula (the relic of SN 1054). Second is the
large production of 64Zn, 70Ge, light p-nuclei (74Se, 78Kr, 84Sr, and 92Mo),
and in particular, 90Zr, which originates from the low Y_e (= 0.46-0.49, the
number of electrons per nucleon) ejecta. We find, however, that only a 1-2%
increase of the minimum Y_e moderates the overproduction of 90Zr. In contrast,
the production of 64Zn is fairly robust against a small variation of Y_e. This
provides the upper limit of the occurrence of this type of events to be about
30% of all core-collapse supernovae.


title: Le trading algorithmique

abstract:
  The algorithmic trading comes from digitalisation of the processing of
trading assets on financial markets. Since 1980 the computerization of the
stock market offers real time processing of financial information. This
technological revolution has offered processes and mathematic methods to
identify best return on transactions. Current research relates to autonomous
transaction systems programmed in certain periods and some algorithms. This
offers return opportunities where traders can not intervene. There are about
thirty algorithms to assist the traders, the best known are the VWAP, the TWAP,
TVOL. The algorithms offer the latest strategies and decision-making are the
subject of much research. These advances in modeling decision-making autonomous
agent can envisage a rich future for these technologies, the players already in
use for more than 30% of their trading.


title: Scaling approach to existence of long cycles in Casimir boxes

abstract:
  We analyse the concept of generalized Bose-Einstein condensation (g-BEC),
known since 1982 for the perfect Bose gas (PBG) in the Casimir (or anisotropic)
boxes. Our aim is to establish a relation between this phenomenon and two
concepts: the concept of long cycles and the Off-Diagonal-Long-Range-Order
(ODLRO), which are usually considered as some adequate way to describe the
standard BEC on the ground state for the cubic boxes. First we show that these
three criterions are equivalent in this latter case. Then, basing on a scaling
approach, we revise formu- lation of these concepts to prove that the
classification of the g-BEC into three types I,II,III, implies a hierarchy of
long cycles (depending on their size scale) as well as a hierarchy of ODLRO
which depends on the coherence length of the condensate.


title: A new distance for high level RNA secondary structure comparison

abstract:
  We describe an algorithm for comparing two RNA secondary structures coded in
the form of trees that introduces two new operations, called node fusion and
edge fusion, besides the tree edit operations of deletion, insertion, and
relabeling classically used in the literature. This allows us to address some
serious limitations of the more traditional tree edit operations when the trees
represent RNAs and what is searched for is a common structural core of two
RNAs. Although the algorithm complexity has an exponential term, this term
depends only on the number of successive fusions that may be applied to a same
node, not on the total number of fusions. The algorithm remains therefore
efficient in practice and is used for illustrative purposes on ribosomal as
well as on other types of RNAs.


title:
On mathematical models for Bose-Einstein condensates in optical lattices
  (expanded version)

abstract:
  Our aim is to analyze the various energy functionals appearing in the physics
literature and describing the behavior of a Bose-Einstein condensate in an
optical lattice. We want to justify the use of some reduced models. For that
purpose, we will use the semi-classical analysis developed for linear problems
related to the Schr\"odinger operator with periodic potential or multiple wells
potentials. We justify, in some asymptotic regimes, the reduction to low
dimensional problems and analyze the reduced problems.


title: Ball throwing on spheres

abstract:
  Ball throwing on Euclidean spaces has been considered for a while. A suitable
renormalization leads to a fractional Brownian motion as limit object. In this
paper we investigate ball throwing on spheres. A different behavior is
exhibited: we still get a Gaussian limit but which is no longer a fractional
Brownian motion. However the limit is locally self-similar when the
self-similarity index $H$ is less than 1/2.


title: Erasing Distinguishability Using Quantum Frequency Up-Conversion

abstract:
  The frequency distinguishability of two single photons was successfully
erased using single photon frequency up-conversion. A frequency non-degenerate
photon pair generated via spontaneous four-wave mixing in a dispersion shifted
fiber was used to emulate two telecom-band single photons that were in the same
temporal mode but in different frequency modes. The frequencies of these
photons were converted to the same frequency by using the sum frequency
generation process in periodically poled lithium niobate waveguides, while
maintaining their temporal indistinguishability. As a result, the two converted
photons exhibited a non-classical dip in a Hong-Ou-Mandel quantum interference
experiment. The present scheme will add flexibility to networking quantum
information systems that use photons with various wavelengths.


title: Integrability of Lie systems and some of its applications in physics

abstract:
  The geometric theory of Lie systems will be used to establish integrability
conditions for several systems of differential equations, in particular Riccati
equations and Ermakov systems. Many different integrability criteria in the
literature will be analyzed from this new perspective and some applications in
physics will be given.


title:
Finite-Temperature Mott Transition in Two-Dimensional Frustrated Hubbard
  Models

abstract:
  We investigate the Hubbard model on two typical frustrated lattices in two
dimensions, the kagome lattice and the anisotropic triangular lattice, by means
of the cellular dynamical mean field theory. We show that the metallic phase is
stabilized up to fairly large Hubbard interactions under strong geometrical
frustration in both cases, which results in heavy fermion behavior and several
anomalous properties around the Mott transition point. In particular, for the
anisotropic triangular lattice, we find novel reentrant behavior in the Mott
transition in the moderately frustrated parameter regime, which is caused by
the competition between Fermi-liquid formation and magnetic correlations. It is
demonstrated that the reentrant behavior is a generic feature inherent in the
Mott transition with intermediate geometrical frustration, and indeed in
accordance with recent experimental findings for organic materials.


title:
CMB polarization map derived from the WMAP 5 year data through Harmonic
  Internal Linear Combination

abstract:
  We have derived whole-sky CMB polarization maps from the WMAP 5 year
polarization data, using the Harmonic Internal Linear Combination (HILC)
method. Our HILC method incorporates spatial variability of linear weights in a
natural way and yields continuous linear weights over the entire sky. To
estimate the power spectrum of HILC maps, we have derived a unbiased quadratic
estimator, which is similar to the WMAP team's cross power estimator, but in a
more convenient form for HILC maps. From our CMB polarization map, we have
obtained TE correlation and E mode power spectra without applying any mask.
They are similar to the WMAP team's estimation and consistent with the WMAP
best-fit $\Lambda$CDM model. Foreground reduction by HILC method is more
effective for high resolution and low noise data. Hence, our HILC method will
enable effective foreground reduction in polarization data from the Planck
surveyor.


title: On cubic Berwald spaces

abstract:
  We show that, for Finsler spaces with cubic metric, Landsberg spaces are
Berwaldian. Also, for decomposable metrics, we determine specific conditions
for a space with cubic metric to be of Berwald type, thus refining the result
in [6].


title:
The pulsating hot subdwarf Balloon 090100001: results of the 2005
  multisite campaign

abstract:
  We present the results of a multisite photometric campaign on the pulsating
sdB star Balloon 090100001. The star is one of the two known hybrid hot
subdwarfs with both long- and short-period oscillations. The campaign involved
eight telescopes with three obtaining UBVR data, four B-band data, and one
Stromgren uvby photometry. The campaign covered 48 nights, providing a temporal
resolution of 0.36microHz with a detection threshold of about 0.2mmag in
B-filter data.
  Balloon 090100001 has the richest pulsation spectrum of any known pulsating
subdwarf B star and our analysis detected 114 frequencies including 97
independent and 17 combination ones. The strongest mode (f_1) in the 2.8mHz
region is most likely radial while the remaining ones in this region form two
nearly symmetric multiplets: a triplet and quintuplet, attributed to
rotationally split \ell=1 and 2 modes, respectively. We find clear increases of
splitting in both multiplets between the 2004 and 2005 observing campaigns,
amounting to 15% on average. The observed splittings imply that the rotational
rate in Bal09 depends on stellar latitude and is the fastest on the equator. We
use a small grid of models to constrain the main mode (f_1), which most likely
represents the radial fundamental pulsation. The groups of p-mode frequencies
appear to lie in the vicinity of consecutive radial overtones, up to the third
one. Despite the large number of g-mode frequencies observed, we failed to
identify them, most likely because of the disruption of asymptotic behaviour by
mode trapping. The observed frequencies were not, however, fully exploited in
terms of seismic analysis which should be done in the future with a larger grid
of reliable evolutionary models of hot subdwarfs.


title:
Cool White Dwarfs Identified in the Second Data Release of the UKIRT
  Infrared Deep Sky Survey

abstract:
  We have paired the Second Data Release of the Large Area Survey of the UKIRT
Infrared Deep Sky Survey with the Fifth Data Release of the Sloan Digital Sky
Survey to identify ten cool white dwarf candidates, from their photometry and
astrometry. Of these ten, one was previously known to be a very cool white
dwarf. We have obtained optical spectroscopy for seven of the candidates using
the GMOS-N spectrograph on Gemini North, and have confirmed all seven as white
dwarfs. Our photometry and astrometry indicates that the remaining two objects
are also white dwarfs. Model analysis of the photometry and available
spectroscopy shows that the seven confirmed new white dwarfs, and the two new
likely white dwarfs, have effective temperatures in the range Teff = 5400-6600
K. Our analysis of the previously known white dwarf confirms that it is cool,
with Teff = 3800 K. The cooling age for this dwarf is 8.7 Gyr, while that of
the nine ~6000 K white dwarfs is 1.8-3.6 Gyr. We are unable to determine the
masses of the white dwarfs from the existing data, and therefore we cannot
constrain the total ages of the white dwarfs. The large cooling age for the
coolest white dwarf in the sample, combined with its low estimated tangential
velocity, suggests that it is an old member of the thin disk, or a member of
the thick disk of the Galaxy, with an age 10-11 Gyr. The warmer white dwarfs
appear to have velocities typical of the thick disk or even halo; these may be
very old remnants of low-mass stars, or they may be relatively young thin disk
objects with unusually high space motion.


title: Testing for changes in polynomial regression

abstract:
  We consider a nonlinear polynomial regression model in which we wish to test
the null hypothesis of structural stability in the regression parameters
against the alternative of a break at an unknown time. We derive the extreme
value distribution of a maximum-type test statistic which is asymptotically
equivalent to the maximally selected likelihood ratio. The resulting test is
easy to apply and has good size and power, even in small samples.


title:
Exchange bias effect in the phase separated Nd_{1-x}Sr_{x}CoO_3 at the
  spontaneous ferromagnetic/ferrimagnetic interface

abstract:
  We report the new results of exchange bias effect in Nd_{1-x}Sr_{x}CoO_3 for
x = 0.20 and 0.40, where the exchange bias phenomenon is involved with the
ferrimagnetic (FI) state in a spontaneously phase separated system. The
zero-field cooled magnetization exhibits the FI (T_{FI}) and ferromagnetic
(T_C) transitions at ~ 23 and \sim 70 K, respectively for x = 0.20. The
negative horizontal and positive vertical shifts of the magnetic hysteresis
loops are observed when the system is cooled through T_{FI} in presence of a
positive static magnetic field. Training effect is observed for x = 0.20, which
could be interpreted by a spin configurational relaxation model. The
unidirectional shifts of the hysteresis loops as a function of temperature
exhibit the absence of exchange bias above T_{FI} for x = 0.20. The analysis of
the cooling field dependence of exchange bias field and magnetization indicates
that the ferromagnetic (FM) clusters consist of single magnetic domain with
average size around \sim 20 and ~ 40 \AA ~ for x = 0.20 and 0.40, respectively.
The sizes of the FM clusters are close to the percolation threshold for x =
0.20, which grow and coalesce to form the bigger size for x = 0.40 resulting in
a weak exchange bias effect.


title:
Radiative cooling in relativistic collisionless shocks. Can simulations
  and experiments probe relevant GRB physics?

abstract:
  We address the question of whether numerical particle-in-cell (PIC)
simulations and laboratory laser-plasma experiments can (or will be able to, in
the near future) model realistic gamma-ray burst (GRB) shocks. For this, we
compare the radiative cooling time, t_cool, of relativistic electrons in the
shock magnetic fields to the microscopic dynamical time of collisionless
relativistic shocks -- the inverse plasma frequency of protons, omega_pp^{-1}.
We obtain that for t_cool*omega_pp^{-1}\lesssim ~few hundred, the electrons
cool efficiently at or near the shock jump and are capable of emitiing away a
large fraction of the shock energy. Such shocks are well-resolved in existing
PIC simulations; therefore, the microscopic structure can be studied in detail.
Since most of the emission in such shocks would be coming from the vicinity of
the shock, the spectral power of the emitted radiation can be directly obtained
from finite-length simulations and compared with observational data. Such
radiative shocks correspond to the internal baryon-dominated GRB shocks for the
conventional range of ejecta parameters. Fermi acceleration of electrons in
such shocks is limited by electron cooling, hence the emitted spectrum should
be lacking a non-thermal tail, whereas its peak likely falls in the multi-MeV
range. Incidentally, the conditions in internal shocks are almost identical to
those in laser-produced plasmas; thus, such GRB-like plasmas can be created and
studied in laboratory experiments using the presently available Petawatt-scale
laser facilities. An analysis of the external shocks shows that only the highly
relativistic shocks, corresponding to the extremely early afterglow phase, can
have efficient electron cooling in the shock transition. We emphasize the
importance of radiative PIC simulations for further studies.


title:
On the Equation $x^{2^l+1}+x+a=0$ over $\mathrm{GF}(2^k)$ (Extended
  Version)

abstract:
  In this paper, the polynomials $P_a(x)=x^{2^l+1}+x+a$ with
$a\in\mathrm{GF}(2^k)$ are studied. New criteria for the number of zeros of
$P_a(x)$ in $\mathrm{GF}(2^k)$ are proved. In particular, a criterion for
$P_a(x)$ to have exactly one zero in $\mathrm{GF}(2^k)$ when $\gcd(l,k)=1$ is
formulated in terms of the values of permutation polynomials introduced by
Dobbertin. We also study the affine polynomial $a^{2^l}x^{2^{2l}}+x^{2^l}+ax+1$
which is closely related to $P_a(x)$. In many cases, explicit expressions for
calculating zeros of these polynomials are provided.


title: Separation of Equilibration Time-Scales in the Gradient Expansion

abstract:
  We study thermalization by applying gradient expansion to the Kadanoff-Baym
equations of the 2PI effective action to two-loop in a theory with Dirac
fermions coupled to scalars. In addition to those chemical potentials which
equilibrate in the on-shell limit, we identify modes which are conserved in
this approximation, but which relax when off-shell effects are taken into
account. This implies that chemical equilibration does not require higher loop
contributions to the effective action and is compatible with the gradient
expansion. We explicitly calculate the damping time-scales of both, on- and
off-shell, chemical equilibration rates. It is shown that off-shell
equilibration is suppressed by the thermal width of the particles in the
plasma, which explains the separation of on- and off-shell chemical
equilibration time-scales.


title: On the parity of generalized partition functions III

abstract:
  Improving on some results of J.-L. Nicolas \cite {Ndeb}, the elements of the
set ${\cal A}={\cal A}(1+z+z^3+z^4+z^5)$, for which the partition function
$p({\cal A},n)$ (i.e. the number of partitions of $n$ with parts in ${\cal A}$)
is even for all $n\geq 6$ are determined. An asymptotic estimate to the
counting function of this set is also given.


title: Phase transitions in large N(c) heavy quark potentials

abstract:
  We describe phase transitions in the heavy quark potential in planar gauge
theories having wrapped D5-brane string duals. A new phase transition,
previously unnoticed in these models, is driven by the source of a large
dimension operator. Another transition, which has already been described in a
previous paper, is driven by the presence of light dynamical flavors. Both
transitions connect a Coulomb-like phase to a confining linear phase.


title:
Heavy Quark Electroproduction and the Heavy Quark Contribution to the
  Proton Structure

abstract:
  New results on charm and beauty electroproduction from the H1 and ZEUS
Collaborations at the ep collider HERA are presented. Differential cross
sections are compared to a next-to-leading order QCD calculation. The heavy
quark contributions, F_2^{cc} and F_2^{bb}, to the proton structure function
F_2 are compared using different experimental techniques. Also, results are
shown on the charm fragmentation function, thereby testing the universality of
fragmentation.


title:
Strong asymmetry of microwave absorption by bi-layer conducting
  ferromagnetic films in the microstrip-line based broadband ferromagnetic
  resonance

abstract:
  Peculiarities of ferromagnetic resonance response of conducting magnetic
bi-layer films of nanometric thicknesses excited by microstrip microwave
transducers have been studied theoretically. Strong asymmetry of the response
has been found. Depending on the order of layers with respect to the transducer
either the first higher-order standing spin wave mode, or the fundamental mode
shows the largest response.
  Film conductivity and lowered symmetry of microwave fields of such
transducers are responsible for this behavior. Amplitude of which mode is
larger also depends on the driving frequency. This effect is explained as
shielding of the asymmetric transducer field by eddy currents in the films.
This shielding remains very efficient for films with thicknesses well below the
microwave skin depth. This effect may be useful for studying buried magnetic
interfaces and should be accounted for in future development of broadband
inductive ferromagnetic resonance methods.


title:
Osmotically driven pipe flows and their relation to sugar transport in
  plants

abstract:
  In plants, osmotically driven flows are believed to be responsible for
translocation of sugar in the pipe-like phloem cell network, spanning the
entire length of the plant. In this paper, we present an experimental and
theoretical study of transient osmotically driven flows through pipes with
semipermeable walls. We extend the experimental work of Eschrich, Evert and
Young \cite[]{Eschrich:1972} by providing a more accurate version of their
experiment allowing for better comparison with theory. In the experiments we
measure the dynamics and structure of a "sugar front", i.e. the transport and
decay of a sudden loading of sugar in a pipe which is closed in both ends. We
include measurements of pressure inside the membrane tube allowing us to
compare the experiments directly with theory and, in particular, to confirm
quantitatively the exponential decay of the front in a closed tube.In a novel
setup we are able to measure the entire concentration profile as the sugar
front moves. In contrast to previous studies we find very good agreement
between experiment and theory.
  In the limit of low axial resistance (valid in our experiments as well as in
many cases in plants) we show that the equations can be solved exactly by the
method of characteristics yielding, in general, an implicit solution. Further
we show that under more general conditions the equations of motion can be
rewritten as a single integro-differential equation, which can be readily
solved numerically. The applicability of our results to plants is discussed and
it is shown that it is probable that the pressure-flow hypothesis can account
for short distance transport of sugar in plants.


title:
Quasinormal modes of a black hole with quintessence-like matter and a
  deficit solid angle: scalar and gravitational perturbations

abstract:
  In the previous paper (Li, X. Z., Xi, P., Zhai, X. H.: Phys. Lett. B{\bf666},
125-130 (2008)), we show the solutions of Einstein equations with static
spherically-symmetric quintessence-like matter surrounding a global monopole.
Furthermore, this monopole become a black hole with quintessence-like matter
and a deficit solid angle when it is swallowed by an ordinary black hole. We
study its quasinormal modes by WKB method in this paper. The numerical results
show that both the real part of the quasinormal frequencies and the imaginary
part decrease as the state parameter $w$, for scalar and gravitational
perturbations. And we also show variations of quasinormal frequencies of scalar
and gravitational fields via different $\epsilon$ (deficit solid angel
parameter) and different $\rho_0$ (density of static spherically-symmetric
quintessence-like matter at $r=1$), respectively.


title: Upper bound for the Lempert function of smooth domains

abstract:
  An upper estimate for the Lempert function of any $C^{1+\epsilon}$-smooth
bounded domain in $\Bbb C^n$ is found in terms of the boundary distance.


title: QCD thermodynamics at zero and non-zero density

abstract:
  We present results on the QCD equation of state, obtained with two different
improved dynamical staggered fermion actions and almost physical quark masses.
Lattice cut-off effects are discussed in detail as results for three different
lattice spacings are available now, i.e. results have been obtained on lattices
with temporal extent of $N_\tau=4,6$ and 8. Furthermore we discuss the Taylor
expansion approach to non-zero baryon chemical potential by means of an
expansion of the pressure. We use the expansion coefficients to calculate
various fluctuations and correlations among hadronic charges. We find that the
correlations reproduce the qualitative behavior of the resonance gas model
below $T_c$ and start to agree with the free gas predictions for $T\gsim
1.5T_c$.


title: A Quantum Fluid Description of the Free Electron Laser

abstract:
  Using the Madelung transformation we show that in a quantum Free Electron
Laser (QFEL) the beam obeys the equations of a quantum fluid in which the
potential is the classical potential plus a quantum potential. The classical
limit is shown explicitly.


title: Light statistics by non-calibrated linear photodetectors

abstract:
  We theoretically demonstrate that detectors endowed with internal gain and
operated in regimes in which they do not necessarily behave as photon-counters,
but still ensure linear input/output responses, can allow a self-consistent
characterization of the statistics of the number of detected photons without
need of knowing their gain. We present experiments performed with a
photo-emissive hybrid detector on a number of classical fields endowed with
non-trivial statistics and show that the method works for both microscopic and
mesoscopic photon numbers. The obtained detected-photon probability
distributions agree with those expected for the photon numbers, which are also
reconstructed by an independent method.


title: Non-thermal photocoercivity effect in a ferromagnetic semiconductor

abstract:
  We report a photoinduced change of the coercive field, i.e., a
photocoercivity effect (PCE), under very low intensity illumination of a
low-doped (Ga,Mn)As ferromagnetic semiconductor. We find a strong correlation
between the PCE and the sample resistivity. Spatially resolved dynamics of the
magnetization reversal rule out any role of thermal heating in the origin of
this PCE, and we propose a mechanism based on the light-induced lowering of the
domain wall pinning energy. The PCE is local and reversible, allowing writing
and erasing of magnetic images using light.


title: Fibonacci Modules and Multiple Fibonacci Sequences

abstract:
  Double Fibonacci sequences are introduced and they are related to operations
with Fibonacci modules. Generalizations and examples are also discussed.


title: Impacts of Typhoons on the Kuroshio Large Meander: Observation Evidences

abstract:
  The formation of the Kuroshio large meander in summer 2004 was investigated
by using the cruise data, Argo profiles data, and satellite remote sensing
data. We validated the point that cyclonic eddy contributes to the large
meander. Besides, the impacts of typhoons on Kuroshio meanders were studied.
  From 29 July to 4 August, the typhoons stirred the ocean and upwelled the
deep water, which enhanced the existed cyclonic eddy, and immediately made a
drastic meander of the Kuroshio. Moreover, the unexpected typhoons in June 2004
also contributed to the initial meander at Tokara Strait. The result suggests
an alternative meander mechanism of Kuroshio path via typhoon-eddy-Kuroshio
interactions. It is argued that typhoons accompanied with cyclonic eddies,
might play crucial roles in meanders of the Kuroshio. This will provide a more
comprehensive understanding of the dynamics of the west boundary flows like the
Kuroshio and the Gulf Stream, and will be useful in eddy-resolution models.


title: Cold compression of nuclei induced by antiprotons

abstract:
  On the basis of a dynamical Relativistic Mean Field (RMF) model we study the
response of a nucleus on the antiproton implanted in its interior. We solve the
Vlasov equation for the antiproton-nuclear system and show assuming a
moderately attractive antiproton optical potential that the compressed state is
formed on a rather short time scale of about 4-10 fm/c. The evolution of the
system after antiproton annihilation is simulated using the Giessen
Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model. Finally, several sensitive
observables to the antiproton annihilation in a compressed nuclear
configuration are proposed, e.g. the nucleon kinetic energy spectra and the
total invariant mass distributions of produced mesons.


title:
The "extended phase space" approach to quantum geometrodynamics: what
  can it give for the development of quantum gravity?

abstract:
  The talk is devoted to the "extended phase space" approach to Quantum
Geometrodynamics. The premises that have led to the formulation of this
approach are briefly reviewed, namely, non-trivial topology of the Universe
which implies the absence of asymptotic states, in contrast to situations one
usually deals in ordinary quantum field theory; parametrization noninvariance
in the Wheeler - DeWitt theory; the problem of time and the absence of
dynamical evolution. Then we discuss the main features of the approach:
Hamiltonian dynamics in extended phase space, gauge-dependent Schrodinger
equation for the wave function of the Universe, the description of quantum
Universe from the viewpoint of observers in a wide enough class of reference
frames. After all, we analyse problems arising in this approach: the structure
of Hilbert space in Quantum Geometrodynamics, the relations between solutions
for the wave function of the Universe corresponding to various reference
frames, properties of a medium to be necessary to fix a reference frame, the
transition to classical limit.


title: Different responses of the upper ocean to typhoon Namtheun

abstract:
  The responses of the upper ocean to typhoon Namtheun in July 2004 are
investigated by sea surface measurements and vertical profiles. Pre-typhoon
ocean environment played an important role in this case. There were two extreme
cooling regions located at cyclonic eddy A and typhoon wake B. Although the
magnitudes of SST cooling at A and B were similar, other physical and
biophysical responses were quite different. Combining multi-satellite data with
vertical profile data, it is found that the upwelling dominated the responses
at A and the vertical mixing dominated the responses at B. This study implies
that to insight into the ocean surface responses to typhoon, the subsurface
dynamics need to be analyzed via both the in situ and satellite-based
observations, and the physical and biological models.


title:
Probing of a parametrically pumped magnon gas with a non-resonant packet
  of traveling spin waves

abstract:
  The magnon gas created by spatially localized longitudinal parametric pumping
in an yttrium-iron-garnet film is probed by a traveling packet of spin waves
non-resonant with the pumping field. The analysis of the influence of the
magnon gas on the amplitude and phase of the propagating spin waves allows to
determine characteristic properties of the parametrically pumped magnon gas. A
simple theoretical model is proposed from which the magnon density in the
pumping region is calculated.


title: On Dark Energy and Dark Matter (Part II)

abstract:
  Phenomena currently attributed to Dark Matter (DM) and Dark Energy (DE) are
merely a result of the interplay between gravitational energy density, caused
by the contraction of space by matter, and space dilation, caused by the energy
density of the Cosmological Microwave Background (CMB). This interplay causes
inhomogeneous and anisotropic expansion, in and around galaxies, where as the
expansion of the universe, when viewed globally, is homogeneous and isotropic.
These contentions lead to a theoretical derivation of the gravitational central
acceleration in and around galaxies, and the determination of g0, the central
acceleration where falttening of Rotation Curves (RC) replaces Keplerian
behavior. Our results, which fit the observed flattening of RCs, resemble the
phenomenological Tully-Fisher and Millgrom MOND relations. However, our central
acceleration, g0, depends on the CMB energy density at the time of formation of
a galaxy and, as opposed to MOND, is not a universal constant.


title:
Relativistic Self-Induced Transparency Effect During Ultraintense Laser
  Interaction with Overdense Plasmas: Why It Occurs and Its Use for Ultrashort
  Electron Bunch Generation

abstract:
  A novel explanation of the relativistic self-induced transparency effect
during superintense laser interaction with an overdense plasma is proposed. We
studied it analytically and verified with direct modeling by both PIC and
kinetic equation simulations. Based on this treatment, a method of ultrashort
high-energy electron bunch generation with durations on a few femtosecond time
scale is also proposed and studied via numerical simulation


title:
Strangeness Production at low Q^2 in Deep-Inelastic ep Scattering at
  HERA

abstract:
  The production of neutral strange hadrons is investigated using
deep-inelastic scattering events measured with the H1 detector at HERA. The
measurements are made in the phase space defined by the negative four-momentum
transfer squared of the photon 2 < Q^2 < 100 GeV^2 and the inelasticity 0.1 < y
< 0.6. The K_s and Lambda production cross sections and their ratios are
determined. K_s production is compared to the production of charged particles
in the same region of phase space. The Lambda - anti-Lambda asymmetry is also
measured and found to be consistent with zero. Predictions of leading order
Monte Carlo programs are compared to the data.


title: Fictitious Magnetic Resonance by Quasi-Electrostatic Field

abstract:
  We propose a new kind of spin manipulation method using a {\it fictitious}
magnetic field generated by a quasi-electrostatic field. The method can be
applicable to every atom with electron spins and has distinct advantages of
small photon scattering rate and local addressability. By using a $\rm{CO_2}$
laser as a quasi-electrostatic field, we have experimentally demonstrated the
proposed method by observing the Rabi-oscillation of the ground state hyperfine
spin F=1 of the cold $\rm{^{87}Rb}$ atoms and the Bose-Einstein condensate.


title:
Multi-Cascade Proton Acceleration by Superintense Laser Pulse in the
  Regime of Relativistically Induced Slab Transparency

abstract:
  A regime of multi-cascade proton acceleration in the interaction of
$10^{21}-10^{22}$ W/cm$^2$ laser pulse with a structured target is proposed.
The regime is based on the electron charge displacement under the action of
laser ponderomotive force and on the effect of relativistically induced slab
transparency which allows to realize idea of multi-cascade acceleration. It is
shown that a target comprising several properly spaced apart thin foils can
optimize the acceleration process and give at the output quasi-monoenergetic
beams of protons with energies up to hundreds of MeV with energy spread of just
few percent.


title: Solving differential equations

abstract:
  The theme of this paper is to `solve' an absolutely irreducible differential
module explicitly in terms of modules of lower dimension and finite extensions
of the differential field $K$. Representations of semi-simple Lie algebras and
differential Galois theory are the main tools. The results extend the classical
work of G. Fano.


title: Notes on Calabi-Yau ordinary differential equations

abstract:
  We investigate the structures of Calabi-Yau differential equations and the
relations to the arithmetic of the pencils of Calabi-Yau varieties behind the
equations. This provides explanations of some observations and computations in
a recent paper by Samol and van Straten.


title: Correlators in Nontrivial Backgrounds

abstract:
  Operators in N=4 super Yang-Mills theory with an R-charge of O(N^2) are dual
to backgrounds which are asymtotically AdS5xS5. In this article we develop
efficient techniques that allow the computation of correlation functions in
these backgrounds. We find that (i) contractions between fields in the string
words and fields in the operator creating the background are the field theory
accounting of the new geometry, (ii) correlation functions of probes in these
backgrounds are given by the free field theory contractions but with rescaled
propagators and (iii) in these backgrounds there are no open string excitations
with their special end point interactions; we have only closed string
excitations.


title: An IPHAS-based search for accreting very low-mass objects using VO tools

abstract:
  The main goal of this paper is to prove that accreting very low-mass stars
and brown dwarfs can be identified in IPHAS, a Halpha emission survey of the
northern Milky Way.Full exploitation of the IPHAS database and a future
extension of it in the southern hemisphere will be useful to identify very
low-mass accreting objects near and far well-known star forming regions. We
have used Virtual Observatory tools to cross-match the IPHAS catalogue with the
2MASS catalogue. We defined photometric criteria to identify Halpha emission
sources with near-infrared colours similar to known young very low-mass stars
and brown dwarfs. 4000 candidates were identified that met our criteria over an
area of 1600 square degrees. We present low-resolution optical spectra of 113
candidates. Spectral types have been derived for the 33 candidates that have
spectroscopically confirmed Halpha emission, negligible reddening and M
spectral class. We have also measured Halpha emission and investigated the NaI
doublet (818.3 nm, 819.5 nm) in these 33 objects. We confirm that 33 IPHAS
candidates have strong Halpha indicative of disk accretion for their spectral
type. 23 of them have spectral class M4 or later, of which 10 have classes in
the range M5.5-M7.0 and thus could be very young brown dwarfs. Also many
objects have weak NaI doublet, an indication of low surface gravity.We conclude
that IPHAS provides a very valuable database to identify accreting very
low-mass stars and brown dwarfs, and that Virtual Observatory tools provide an
efficient method for identifying these objects over large areas of the sky.
Based on our success rate of 23 Halpha emission objects with spectral type in
the range M4-M7 out of 113 candidates with spectroscopic follow-up, we estimate
that there could be hundreds of such objects in the full IPHAS survey.


title:
Scaling behaviors of RESET voltages and currents in unipolar resistance
  switching

abstract:
  Unipolar switching phenomena have attracted a great deal of recent attention,
but the wide distributions of switching voltages still pose major obstacles for
scientific advancement and practical applications. Using NiO capacitors, we
investigated the distributions of the RESET voltage and current. We found that
they scaled with the resistance value Ro in the low resistance state, and that
the scaling exponents varied at Ro = 30 Ohm. We explain these intriguing
scaling behaviors and their crossovers by analogy with percolation theory. We
show that the connectivity of conducting filaments plays a crucial role in the
RESET process.


title: Fibred torti-rational knots

abstract:
  A torti-rational knot, denoted by K(2a,b|r), is a knot obtained from the
2-bridge link B(2a,b) by applying Dehn twists an arbitrary number of times, r,
along one component of B(2a,b). We determine the genus of K(2a,b|r) and solve a
question of when K(2a,b|r) is fibred. In most cases, the Alexander polynomials
determine the genus and fibredness of these knots. We develop both algebraic
and geometric techniques to describe the genus and fibredness by means of
continued fraction expansions of b/2a. Then, we explicitly construct minimal
genus Seifert surfaces. As an application, we solve the same question for the
satellite knots of tunnel number one.


title: Quantum hypothesis testing and sufficient subalgebras

abstract:
  We introduce a new notion of a sufficient subalgebra for quantum states: a
subalgebra is 2- sufficient for a pair of states $\{\rho_0,\rho_1\}$ if it
contains all Bayes optimal tests of $\rho_0$ against $\rho_1$. In classical
statistics, this corresponds to the usual definition of sufficiency. We show
this correspondence in the quantum setting for some special cases. Furthermore,
we show that sufficiency is equivalent to 2 - sufficiency, if the latter is
required for $\{\rho_0^{\otimes n},\rho_1^{\otimes}\}$, for all $n$.


title: Asymptotically CAT(0) Groups

abstract:
  We study the general theory of asymptotically CAT(0) groups, explaining why
such a group has finitely many conjugacy classes of finite subgroups, is
$F_\infty$ and has solvable word problem. We provide techniques to combine
asymptotically CAT(0) groups via direct products, amalgams and HNN extensions.
  The universal cover of the Lie group $PSL(2,\mathbb{R})$ is shown to be an
asymptotically CAT(0) metric space. Therefore, co-compact lattices in
$\widetilde{PSL(2,\mathbb{R})}$ provide the first examples of asymptotically
CAT(0) groups which are neither CAT(0) nor hyperbolic. Another source of
examples is shown to be the class of relatively hyperbolic groups.


title: Pair production in laser fields oscillating in space and time

abstract:
  The production of electron-positron pairs from vacuum by counterpropagating
laser beams of linear polarization is calculated. In contrast to the usual
approximate approach, the spatial dependence and magnetic component of the
laser field are taken into account. We show that the latter strongly affects
the creation process at high laser frequency: the production probability is
reduced, the kinematics is fundamentally modified, the resonant
Rabi-oscillation pattern is distorted and the resonance positions are shifted,
multiplied and split.


title: Massless propagators: applications in QCD and QED

abstract:
  We report on two recent results based on the evaluation of five-loop massless
propagators in QCD and QED: (i) corrections of order $\alpha_s^4$ to the
absorptive part of the polarization function in QCD with $n_f=3$;(ii) the
five-loop contribution to the $\beta$ function of quenched QED.


title: Stabilisation of Seven Directions in an Early Universe M -- theory Model

abstract:
  Our model consists of intersecting 22'55' branes in M theory distributed
uniformly in the common transverse space. Equations of state follow from U
duality symmetries. In this model, three spatial directions expand, and seven
directions stabilise to constant sizes. From string theory perspective, the
dilaton is hence stabilised. The constant sizes depend on certain imbalance
among initial values. One naturally obtains M_{11} \simeq M_s \simeq M_4 and
g_s \simeq 1 within a few orders of magnitude. Smaller numbers, for example M_s
\simeq 10^{- 16} M_4, are also possible but require fine tuning.


title: Quantum Brownian motion under rapid periodic forcing

abstract:
  We study the steady state behaviour of a confined quantum Brownian particle
subjected to a space-dependent, rapidly oscillating time-periodic force. To
leading order in the period of driving, the result of the oscillating force is
an effective static potential which has a quantum dissipative contribution,
$V_{QD}$, which adds on to the classical result. This is shown using a coherent
state representation of bath oscillators. $V_{QD}$ is evaluated exactly in the
case of an Ohmic dissipation bath. It is strongest for intermediate values of
the damping, where it can have pronounced effects.


title:
Characterization of the absolute frequency stability of an individual
  reference cavity

abstract:
  We demonstrated for the first time the characterization of absolute frequency
stability of three reference cavities by cross beating three laser beams which
are independently locked to these reference cavities. This method shows the
individual feature of each reference cavity, while conventional beatnote
measurement between two cavities can only provide an upper bound. This method
allows for numerous applications such as optimizing the performance of the
reference cavity for optical clockwork.


title:
Coherent Exciton Dynamics and Trapping in Topologically Disordered
  Systems

abstract:
  We analyze the coherent dynamics of excitons in three dimensional
topologically disordered networks with traps. If the interactions between the
nodes of the network are long ranged, i.e., algebraically decaying as a
function of the distance between the nodes, the average survival probability of
an exciton surprisingly shows a characteristic decay with features similar to
the decay found for regular one-dimensional systems. We further show how this
decay can be related to the eigenstates of the same system without a trap.


title: Two-component abelian sandpile models

abstract:
  In one-component abelian sandpile models, the toppling probabilities are
independent quantities. This is not the case in multi-component models. The
condition of associativity of the underlying abelian algebras impose nonlinear
relations among the toppling probabilities. These relations are derived for the
case of two-component quadratic abelian algebras. We show that abelian sandpile
models with two conservation laws have only trivial avalanches.


title: Totally Null Surfaces in Neutral Kaehler 4-Manifolds

abstract:
  We study the totally null surfaces of the neutral Kaehler metric on certain
4-manifolds. The tangent spaces of totally null surfaces are either self-dual
($\alpha$-planes) or anti-self-dual ($\beta$-planes) and so we consider
$\alpha$-surfaces and $\beta$-surfaces. The metric of the examples we study,
which include the spaces of oriented geodesics of 3-manifolds of constant
curvature, are anti-self-dual, and so it is well-known that the $\alpha$-planes
are integrable and $\alpha$-surfaces exist. These are holomorphic Lagrangian
surfaces, which for the geodesic spaces correspond to totally umbilic
foliations of the underlying 3-manifold.
  The $\beta$-surfaces are less known and our interest is mainly in their
description. In particular, we classify the $\beta$-surfaces of the neutral
Kaehler metric on $TN$, the tangent bundle to a Riemannian 2-manifold $N$.
These include the spaces of oriented geodesics in Euclidean and Lorentz
3-space, for which we show that the $\beta$-surfaces are affine tangent bundles
to curves of constant geodesic curvature on $S^2$ and $H^2$, respectively. In
addition, we construct the $\beta$-surfaces of the space of oriented geodesics
of hyperbolic 3-space.


title: Self-consistent characterization of light statistics

abstract:
  We demonstrate the possibility of a self-consistent characterization of the
photon-number statistics of a light field by using photoemissive detectors with
internal gain simply endowed with linear input/output responses. The method can
be applied to both microscopic and mesoscopic photon-number regimes. The
detectors must operate in the linear range without need of photon-counting
capabilities.


title: Graphene: a perfect nanoballoon

abstract:
  We have performed a first-principles density functional theory investigation
of the penetration of helium atoms through a graphene monolayer with defects.
The relaxation of the graphene layer caused by the incoming helium atoms does
not have a strong influence on the height of the energy barriers for
penetration. For defective graphene layers, the penetration barriers decrease
exponentially with the size of the defects but they are still sufficiently high
that very large defects are needed to make the graphene sheet permeable for
small atoms and molecules. This makes graphene a very promising material for
the construction of nanocages and nanomembranes.


title:
The Existence of Sterile Neutrino Halos in Galactic Centers as an
  Explanation of the Black Hole mass - Velocity Dispersion Relation

abstract:
  If sterile neutrinos exist and form halos in galactic centers, they can give
rise to observational consequences. In particular, the sterile neutrinos decay
radiatively and heat up the gas in the protogalaxy to achieve hydrostatic
equilibrium, and they provide the mass to form supermassive blackholes. A
natural correlation between the blackhole mass and velocity dispersion thus
arises $\log(M_{BH,f}/M_{\odot})=\alpha \log (\sigma /200 {\rm km s^{-1}})+
\beta$ with $\alpha \approx 4$ and $\beta \approx 8$.


title: Statistical Characterizers of Transport in a Communication Network

abstract:
  We identify the statistical characterizers of congestion and decongestion for
message transport in model communication lattices. These turn out to be the
travel time distributions, which are Gaussian in the congested phase, and
log-normal in the decongested phase. Our results are demonstrated for two
dimensional lattices, such the Waxman graph, and for lattices with local
clustering and geographic separations, gradient connections, as well as for a
1-d ring lattice with random assortative connections. The behavior of the
distribution identifies the congested and decongested phase correctly for these
distinct network topologies and decongestion strategies. The waiting time
distributions of the systems also show identical signatures of the congested
and decongested phases.


title:
Network Coding-based Protection Strategies Against a Single Link Failure
  in Optical Networks

abstract:
  In this paper we develop network protection strategies against a single link
failure in optical networks. The motivation behind this work is the fact that
$%70$ of all available links in an optical network suffers from a single link
failure. In the proposed protection strategies, denoted NPS-I and NPS-II, we
deploy network coding and reduced capacity on the working paths to provide a
backup protection path that will carry encoded data from all sources. In
addition, we provide implementation aspects and how to deploy the proposed
strategies in case of an optical network with $n$ disjoint working paths.


title: Isoperimetric functions for subdirect products and Bestvina-Brady groups

abstract:
  In this thesis we investigate the Dehn functions of two different classes of
groups: subdirect products, in particular subdirect products of limit groups;
and Bestvina-Brady groups.
  Let D = \Gamma_1 \times ... \times \Gamma_n be a direct product of n \geq 3
finitely presented groups and let H be a subgroup of D. Suppose that each
\Gamma_i contains a finite index subgroup \Gamma_i' \leq \Gamma_i such that the
commutator subgroup [D', D'] of D' = \Gamma_1' \times ... \times \Gamma_n' is
contained in H. Suppose furthermore that, for each i, the subgroup \Gamma_i H
has finite index in D. We prove that H is finitely presented and satisfies an
isoperimetric inequality given in terms of area-radius pairs for the \Gamma_i
and the dimension of (D'/H) \otimes \Q. In the case that each \Gamma_i admits a
polynomial-polynomial area-radius pair, it will follow that H satisfies a
polynomial isoperimetric inequality.
  As a corollary we obtain that if K is a subgroup of a direct product of n
limit groups and if K is of type FP_m(\Q), where m = \max {2, n-1}, then K is
finitely presented and satisfies a polynomial isoperimetric inequality. In
particular, we obtain that all finitely presented subgroups of a direct product
of at most 3 limit groups satisfy a polynomial isoperimetric inequality.
  We also prove that if B is a finitely presented Bestvina-Brady group, then B
admits a quartic isoperimetric function.


title:
Locally computable approximations for spectral clustering and absorption
  times of random walks

abstract:
  We address the problem of determining a natural local neighbourhood or
"cluster" associated to a given seed vertex in an undirected graph. We
formulate the task in terms of absorption times of random walks from other
vertices to the vertex of interest, and observe that these times are well
approximated by the components of the principal eigenvector of the
corresponding fundamental matrix of the graph's adjacency matrix. We further
present a locally computable gradient-descent method to estimate this
Dirichlet-Fiedler vector, based on minimising the respective Rayleigh quotient.
Experimental evaluation shows that the approximations behave well and yield
well-defined local clusters.


title: A measure-theoretic approach to the theory of dense hypergraphs

abstract:
  In this paper we develop a measure-theoretic method to treat problems in
hypergraph theory. Our central theorem is a correspondence principle between
three objects: An increasing hypergraph sequence, a measurable set in an
ultraproduct space and a measurable set in a finite dimensional Lebesgue space.
Using this correspondence principle we build up the theory of dense hypergraphs
from scratch. Along these lines we give new proofs for the Hypergraph Removal
Lemma, the Hypergraph Regularity Lemma, the Counting Lemma and the Testability
of Hereditary Hypergraph Properties. We prove various new results including a
strengthening of the Regularity Lemma and an Inverse Counting Lemma. We also
prove the equivalence of various notions for convergence of hypergraphs and we
construct limit objects for such sequences. We prove that the limit objects are
unique up to a certain family of measure preserving transformations. As our
main tool we study the integral and measure theory on the ultraproduct of
finite measure spaces which is interesting on its own right.


title:
Demonstration of a bright and compact source of tripartite nonclassical
  light

abstract:
  We experimentally demonstrate the nonclassical photon number correlations
expected in tripartite continuous variable states obtained by parametric
processes. Our scheme involves a single nonlinear crystal, where two
interlinked parametric interactions take place simultaneously, and represents a
bright and compact source of a sub-shot-noise tripartite light field. We
analyze the effects of the pump intensities on the numbers of detected photons
and on the amount of noise reduction in some details, thus demonstrating a good
agreement between the experimental data and a single-mode theoretical
description.


title: Quantum resistance metrology in graphene

abstract:
  We have performed a metrological characterization of the quantum Hall
resistance in a 1 $\mu$m wide graphene Hall-bar. The longitudinal resistivity
in the center of the $\nu=\pm 2$ quantum Hall plateaus vanishes within the
measurement noise of 20 m$\Omega$ upto 2 $\mu$A. Our results show that the
quantization of these plateaus is within the experimental uncertainty (15 ppm
for 1.5$ \mu$A current) equal to that in conventional semiconductors. The
principal limitation of the present experiments are the relatively high contact
resistances in the quantum Hall regime, leading to a significantly increased
noise across the voltage contacts and a heating of the sample when a high
current is applied.


title: The MOND limit from space-time scale invariance

abstract:
  The MOND limit is shown to follow from a requirement of space-time scale
invariance of the equations of motion for nonrelativistic, purely gravitational
systems; i.e., invariance of the equations of motion under (t,r) goes to
(qt,qr), in the limit a0 goes to infinity. It is suggested that this should
replace the definition of the MOND limit based on the low-acceleration behavior
of a Newtonian-MOND interpolating function. In this way, the salient, deep-MOND
results--asymptotically flat rotation curves, the mass-rotational-speed
relation (baryonic Tully-Fisher relation), the Faber-Jackson relation,
etc.--follow from a symmetry principle. For example, asymptotic flatness of
rotation curves reflects the fact that radii change under scaling, while
velocities do not. I then comment on the interpretation of the deep-MOND limit
as one of "zero mass": Rest masses, whose presence obstructs scaling symmetry,
become negligible compared to the "phantom", dynamical masses--those that some
would attribute to dark matter. Unlike the former masses, the latter transform
in a way that is consistent with the symmetry. Finally, I discuss the putative
MOND-cosmology connection in light of another, previously known symmetry of the
deep-MOND limit. In particular, it is suggested that MOND is related to the
asymptotic de Sitter geometry of our universe. It is conjectured, for example,
that in an exact de Sitter cosmos, deep-MOND physics would exactly apply to
local systems. I also point out, in this connection, the possible relevance of
a de Sitter-conformal-field-theory (dS/CFT) duality.


title: Correlation Lengths of Red and Blue Galaxies: A New Cosmic Ruler

abstract:
  A comparison of the correlation lengths of red galaxies with blue can provide
a new cosmic ruler. Using 269,000 galaxies from the SDSS DR6 survey, I show
that the 3D correlation length averaged over many clusters remains very nearly
constant at Lo=4.797+/-0.024 Mpc/h from small redshifts out to redshifts of
0.5. This serves as a new measure of cosmic length scales as well as a means of
testing the standard cosmological model that is almost free of selection
biases. The cluster number density also appears to remain constant over this
redshift range.


title: Exclusive Central Production and Diffractive W/Z Results from CDF II

abstract:
  We report recently published results on central exclusive production of
di-jets and di-photons, and exclusive QED production of e+e- pairs. In
addition, we discuss preliminary results on exclusive photoproduction of
charmonium and bottomonium, exclusive QED production of mu+mu- pairs, and
single diffractive W/Z production. All the presented results were extracted
from data collected by the CDF II detector from proton-antiproton collisions at
a c.m.s. energy of 1.96 TeV. The implications of these results for the Large
Hadron Collider are briefly examined.


title: Model theoretic forcing in analysis

abstract:
  We present a framework for model theoretic forcing in a non-first-order
context, and present some applications of this framework to Banach space
theory.


title: Optimizing H1 cavities for the generation of entangled photon pairs

abstract:
  We report on the theoretical investigation of photonic crystal cavities
etched on a suspended membrane for the generation of polarization entangled
photon pairs using the biexciton cascade in a single quantum dot. The
implementation of spontaneous emission enhancement effect increases the
entanglement visibility, while the concomitant preferential funneling of the
emission in the cavity mode increases the collection of both entangled photons.
We demonstrate and quantify that standard cavity designs present a polarization
dependent emission diagram, detrimental to entanglement. The optimization of H1
cavities allows to obtain both high collection efficiencies and polarization
independent emission, while keeping high Purcell factors necessary for high
quality entangled photon sources.


title: Discrete approximation of the free Fock space

abstract:
  We prove that the free Fock space ${\F}(\R^+;\C)$, which is very commonly
used in Free Probability Theory, is the continuous free product of copies of
the space $\C^2$. We describe an explicit embedding and approximation of this
continuous free product structure by means of a discrete-time approximation:
the free toy Fock space, a countable free product of copies of $\C^2$. We show
that the basic creation, annihilation and gauge operators of the free Fock
space are also limits of elementary operators on the free toy Fock space. When
applying these constructions and results to the probabilistic interpretations
of these spaces, we recover some discrete approximations of the semi-circular
Brownian motion and of the free Poisson process. All these results are also
extended to the higher multiplicity case, that is, ${\F}(\R^+;\C^N)$ is the
continuous free product of copies of the space $\C^{N+1}$.


title: Data volume and power of multiple tests with small sample size per null

abstract:
  In multiple hypothesis testing, the volume of data, defined as the number of
replications per null times the total number of nulls, usually defines the
amount of resource required. On the other hand, power is an important measure
of performance for multiple testing. Due to practical constraints, the number
of replications per null may not be large enough in terms of the difference
between false and true nulls. For the case where the population fraction of
false nulls is constant, we show that, as the difference between false and true
nulls becomes increasingly subtle while the number of replications per null
cannot increase fast enough, (1) in order to have enough chance that the data
to be collected will yield some trustworthy findings, as measured by a
conditional version of the positive false discovery rate (pFDR), the volume of
data has to grow at a rate much faster than in the case where the number of
replications per null can be large enough, and (2) in order to control the pFDR
asymptotically, power has to decay to 0 in a rate highly sensitive to rejection
criterion and there is no asymptotically most powerful procedures among those
that control the pFDR asymptotically at the same level.


title:
Strong Convergence towards self-similarity for one-dimensional
  dissipative Maxwell models

abstract:
  We prove the propagation of regularity, uniformly in time, for the scaled
solutions of one-dimensional dissipative Maxwell models. This result together
with the weak convergence towards the stationary state proven by Pareschi and
Toscani in 2006 implies the strong convergence in Sobolev norms and in the L^1
norm towards it depending on the regularity of the initial data. In the case of
the one-dimensional inelastic Boltzmann equation, the result does not depend of
the degree of inelasticity. This generalizes a recent result of Carlen,
Carrillo and Carvalho (arXiv:0805.1051v1), in which, for weak inelasticity,
propagation of regularity for the scaled inelastic Boltzmann equation was found
by means of a precise control of the growth of the Fisher information.


title:
Remarks on monopole charge properties within the Generalized Coherent
  State Model

abstract:
  The Generalized Coherent State Model, proposed previously for a unified
description of magnetic and electric collective properties of nuclear systems,
is used to study the ground state band charge density as well as the E0
transitions from $0^+_{\beta}$ to $0^+_g$. The influence of the nuclear
deformation and of angular momentum projection on the charge density is
investigated. The monopole transition amplitude has been calculated for ten
nuclei. The results are compared with some previous theoretical studies and
with the available experimental data. Our results concerning angular momentum
projection are consistent with those of previous microscopic calculations for
the ground state density. The calculations for the E0 transitions agree quite
well with the experimental data. Issues like how the shape transitions or shape
coexistence are reflected in the $\rho(E0)$ behavior are also addressed.


title: On finite Thurston type orderings of braid groups

abstract:
  We prove that for any finite Thurston-type ordering $<_{T}$ on the braid
group\ $B_{n}$, the restriction to the positive braid monoid
$(B_{n}^{+},<_{T})$ is a\ well-ordered set of order type
$\omega^{\omega^{n-2}}$. The proof uses a combi\ natorial description of the
ordering $<_{T}$. Our combinatorial description is \ based on a new normal form
for positive braids which we call the $\C$-normal fo\ rm. It can be seen as a
generalization of Burckel's normal form and Dehornoy's \ $\Phi$-normal form
(alternating normal form).


title: Diffractive jets production in pp-collisions

abstract:
  We consider the exclusive diffractive dissociation of a proton into three
jets with large transverse momenta in the double-logarithmic approximation of
perturbative QCD. This process is sensitive to the proton unintegrated gluon
distribution at small x and to the proton light-cone distribution amplitudes.
According to our estimates, an observation of such processes in the early runs
at LHC is feasible for jet transverse momenta of the order of 5 GeV.


title:
Mean Motion Resonances in Extrasolar Planetary Systems with Turbulence,
  Interactions, and Damping

abstract:
  This paper continues previous work on the effects of turbulence on mean
motion resonances in extrasolar planetary systems. Turbulence is expected to
arise in the disks that form planets, and these fluctuations act to compromise
resonant configurations. This paper extends previous work by considering how
interactions between the planets and possible damping effects imposed by the
disk affect the outcomes. These physical processes are studied using three
approaches: numerical integrations of the 3-body problem with additional
forcing due to turbulence, model equations that reduce the problem to
stochastically driven oscillators, and Fokker-Planck equations that describe
the time evolution of an ensemble of systems. With this combined approach, we
elucidate the physics of how turbulence can remove extrasolar planetary systems
from mean motion resonance. As expected, systems with sufficiently large
damping (dissipation) can maintain resonance, in spite of turbulent forcing. In
the absence of strong damping, ensembles of these systems exhibit two regimes
of behavior, where the fraction of the bound states decreases as a power-law or
as an exponential. Both types of behavior can be understood through the model
developed herein. For systems with weak interactions between planets, the model
reduces to a stochastic pendulum, and the fraction of bound states decreases as
a power-law. For highly interactive systems, the dynamics are more complicated
and the fraction of bound states decreases exponentially. We show how planetary
interactions lead to drift terms in the Fokker-Planck equation and account for
this exponential behavior. In addition to clarifying the physical processes
involved, this paper strengthens the finding that turbulence implies that mean
motions resonances should be rare.


title:
Analytic calculation of two-loop QCD corrections to b\to s\ell^+\ell^-
  in the high q^2 region

abstract:
  We present our results for the NNLL virtual corrections to the matrix
elements of the operators O_1 and O_2 for the inclusive process b\to
s\ell^+\ell^- in the kinematical region q^2>4m_c^2, where q^2 is the invariant
mass squared of the lepton-pair. This is the first analytic two-loop
calculation of these matrix elements in the high q^2 region. We give the matrix
elements as an expansion in m_c/m_b and keep the full analytic dependence on
q^2. Making extensive use of differential equation techniques, we fully
automatize the expanding of the Feynman integrals in m_c/m_b. In coincidence
with an earlier work where the master integrals where calculated numerically
(Ghinculov et al.) we find that in the high q^2 region the \alpha_s corrections
to the matrix elements <s \ell^+ \ell^-|O_{1,2}|b> calculated in the present
paper lead to a decrease of the q^2-spectrum by 10%-15% relative to the NNLL
result in which these contributions are put to zero and reduce the
renormalization scale uncertainty to ~2%.


title:
One-Loop Yukawa Corrections to the Process pp -> b anti-b H in the
  Standard Model at the LHC: Landau Singularities

abstract:
  We calculate the leading electroweak (EW) corrections to the important
process of Higgs production associated with two bottom quarks at the CERN Large
Hadron Collider (LHC). Our study is restricted to the Standard Model (SM).
  At tree-level Higgs production in association with a b-quark pair proceeds
through the small Yukawa bottom coupling in the Standard Model. Even in the
limit where this coupling vanishes, EW one-loop effects, through the top-Higgs
Yukawa coupling in particular, can still trigger this reaction. This
contribution is small for Higgs masses around 120GeV but it quickly picks up
for higher Higgs masses especially because the one-loop amplitude develops a
leading Landau singularity and new thresholds open up. These effects can be
viewed as the production of a pair of top quarks which rescatter to give rise
to Higgs production through WW fusion. An important part of the thesis is
devoted to the topic of Landau singularities in one-loop Feynman diagrams and
application to the specific process of bbH production at the LHC.
  Since the 4-point leading Landau singularity is not integrable when the
one-loop amplitude is squared, we regulate the cross section by taking into
account the width of the internal top and W particles. This requires that we
extend the usual box one-loop function to the case of complex masses. We show
how this can be implemented analytically in our case.
  We study in some detail the cross section at the LHC as a function of the
Higgs mass and show how some distributions can be drastically affected compared
to the tree-level result.


title: SU(r,L) is separably unirational

abstract:
  We show that the moduli space of SU_X(r,L) of rank r bundles of fixed
determinant L on a smooth projective curve X is separably unirational.


title:
Suppression of light propagation in a medium made of randomly arranged
  dielectric spheres

abstract:
  Light propagation in a medium made of densely packed dielectric spheres is
investigated by using a rigorous diffraction theory. It is shown that a
substantial suppression of the local density of states occurs in spectral
domains where the single constituents exhibit Mie resonances. The local density
of states decreases exponentially at the pertinent frequencies with a linearly
increasing spatial extension of the aggregated spheres. It is shown that a
self-sustaining random arrangement of core-shell spheres shows the same
fundamental characteristics. Such approach offers a path towards easy to
fabricate photonic materials with omnidirectional gaps that may find use in
various applications.


title: Itinerant Ferromagnetism in the electronic localization limit

abstract:
  We present Hall effect, $R_{xy}(H)$, and magnetoresistance, $R_{xx}(H)$,
measurements of ultrathin films of Ni, Co and Fe with thicknesses varying
between 0.2-8 nm and resistances between 1 M$\Omega$ - 100 $\Omega.$ Both
measurements show that films having resistance above a critical value, $R_{C}$,
(thickness below a critical value, $d_{C}$) show no signs for ferromagnetism.
Ferromagnetism appears only for films with $R<R_{C}$, where $R_{C}$ is material
dependent. We raise the possibility that the reason for the absence of
spontaneous magnetization is suppression of itinerant ferromagnetism by
electronic disorder in the strong localization regime.


title:
From thermally activated to viscosity controlled fracture of biopolymer
  hydrogels

abstract:
  We report on rate-dependent fracture energy measurements over three decades
of steady crack velocities in alginate and gelatin hydrogels. We evidence that,
irrespective of gel thermo-reversibility, thermally activated "unzipping" of
the non-covalent cross-link zones results in slow crack propagation, prevaling
against the toughening effect of viscous solvent drag during chain pull-out,
which becomes efficient above a few mm.s$^{-1}$. We extend a previous model
[Baumberger {\it et al.} Nature Materials, {\bf 5}, 552 (2006)] to account for
both mechanisms, and estimate the microscopic unzipping rates.


title: Projections in several complex variables

abstract:
  This work consists two parts. In the first part, we completely study the heat
equation method of Menikoff-Sjostrand and apply it to the Kohn Laplacian
defined on a compact orientable connected CR manifold. We then get the full
asymptotic expansion of the Szego projection for (0,q) forms when the Levi
formis nondegenerate. This generalizes a result of Boutet de Monvel and
Sjostrand for (0,0) forms. Our main tool is Fourier integral operators with
complex valued phase functions of Melin and Sjostrand. In the second part, we
obtain the full asymptotic expansion of the Bergman projection for (0,q) forms
when the Levi form is non-degenerate. This also generalizes a result of Boutet
de Monvel and Sjostrand for (0,0) forms. We introduce a new operator analogous
to the Kohn Laplacian defined on the boundary of a domain and we apply the heat
equation method of Menikoff and Sjostrand to this operator. We obtain a
description of a new Szego projection up to smoothing operators. Finally, by
using the Poisson operator, we get our main result.


title: sBelle Design Study Report

abstract:
  In this note, we compile results of various simulation studies for the
upgrade of the Belle detector. Based on these studies, we propose a set of
optimum or appropriate parameters of the detector.


title:
Magnetic field induced enhancement of spin-order peak intensity in
  La(1.875)Ba(0.125)CuO(4)

abstract:
  We report on neutron-scattering results on the impact of a magnetic field on
stripe order in the cuprate La$_{1.875}$Ba$_{0.125}$CuO$_4$. It is found that a
7 T magnetic field applied along the {\it c} axis causes a small but finite
enhancement of the spin-order peak intensity and has no observable effect on
the peak width. Inelastic neutron-scattering measurements indicate that the
low-energy magnetic excitations are not affected by the field, within
experimental error. In particular, the small energy gap that was recently
reported is still present at low temperature in the applied field. In addition,
we find that the spin-correlation length along the antiferromagnetic stripes is
greater than that perpendicular to them.


title:
On perturbations of Hilbert spaces and probability algebras with a
  generic automorphism

abstract:
  We prove that $IHS_A$, the theory of infinite dimensional Hilbert spaces
equipped with a generic automorphism, is $\aleph_0$-stable up to perturbation
of the automorphism, and admits prime models up to perturbation over any set.
Similarly, $APr_A$, the theory of atomless probability algebras equipped with a
generic automorphism is $\aleph_0$-stable up to perturbation. However, not
allowing perturbation it is not even superstable.


title: Stability and stable groups in continuous logic

abstract:
  We develop several aspects of local and global stability in continuous first
order logic. In particular, we study type-definable groups and genericity.


title: The origin of the spontaneous electric polarization

abstract:
  The phenomenon of the spontaneous electric polarization (ferro- and
antiferroelectricity) is one of the fundamental problems of the solid-state
physics. Although, there has been lot of experimental and theoretical progress,
still needs to be made to understand the origine of the spontaneous electric
polarization. A new microscopic theory that is based on the perfectly elastic
electron-atom and atom-atom collisions, crystal structure and the chemical
composition of the compounds is developed to calculate the critical
temperatures for materials with spontaneous electric polarization. The
reliability of this model was examined by comparing the experimental results
with calculated values.


title: Hyperoctahedral species

abstract:
  We introduce a new definition for the species of type B, or H-species, analog
to the classical species (of type A), but on which we consider the action of
the groups Bn of signed permutations. We are interested in algebraic structure
on these H-species and give examples of Hopf monoids. The natural way to get a
graded vector space from a species, given in this paper in terms of functors,
will allow us to deepen our understanding of these species. In particular, the
image of the classical species of set compositions under a given functor is
isomorphic to the combinatorial Hopf algebra DQSym.


title:
An Application of Chaos Theory for Estimation of Simultaneous
  Variability of RR-intervals in Heart and Systolic Blood Pressure in Humans

abstract:
  We introduce a new method to estimate BaroReflex Sensitivity (BRS) . The
methodology, based on the CZF formulation, recently published (see Conte et al
2008), enables to evaluate simultaneous variability of RR and SBP and to
estimate the coupling strength. The technique is applied to subjects (female
and men with age ranging from 21 to 28 years old) and it is compared with the
results that may be obtained by using the standard Fourier spectral analysis
technique. The comparison is also performed by using the technique of
Lomb-Scargle periodogram, based on Fourier analysis.


title:
Realizations of AF-algebras as graph algebras, Exel-Laca algebras, and
  ultragraph algebras

abstract:
  We give various necessary and sufficient conditions for an AF-algebra to be
isomorphic to a graph C*-algebra, an Exel-Laca algebra, and an ultragraph
C*-algebra. We also explore consequences of these results. In particular, we
show that all stable AF-algebras are both graph C*-algebras and Exel-Laca
algebras, and that all simple AF-algebras are either graph C*-algebras or
Exel-Laca algebras. In addition, we obtain a characterization of AF-algebras
that are isomorphic to the C*-algebra of a row-finite graph with no sinks.


title: Sizable CP Violation in the Bosonized Standard Model

abstract:
  Using the worldline method, we derive an effective action of the bosonic
sector of the Standard Model by integrating out the fermionic degrees of
freedom. The CP violation stemming from the complex phase in the CKM matrix
gives rise to CP-violating operators in the one-loop effective action in the
next-to-leading order of a gradient expansion. We calculate the prefactor of
the appropriate operators and give general estimates of CP violation in the
bosonic sector of the Standard Model. In particular, we show that the effective
CP violation for weak gauge fields is not suppressed by the Yukawa couplings of
the light quarks and is much larger than the bound given by the Jarlskog
determinant.


title:
Entanglement dynamics of a two-particle scattering in pulsed sinusoidal
  potentials

abstract:
  We study by means of time-dependent numerical simulations the behavior of the
entanglement stemming from the Coulomb scattering between two charged particles
subject to a pulse of sinusoidal potential. We show that the splitting of the
spatial wavefunction brought about by the interaction with the potential pulse
plays a key role in the appearance of quantum correlation, thus leading under
specific conditions to a peculiar behavior. The dependence of the final
entanglement upon the physical parameters describing the pulse is discussed.
Our results can be applied to a number of physical systems, such as
electron-electron scattering in semiconductors or cold-ions dynamics in
external fields.


title: Sound Waves in (2+1) Dimensional Holographic Magnetic Fluids

abstract:
  We use the AdS/CFT correspondence to study propagation of sound waves in
strongly coupled (2+1) dimensional conformal magnetic fluids. Our computation
provides a nontrivial consistency check of the viscous magneto-hydrodynamics of
Hartnoll-Kovtun-Muller-Sachdev to leading order in the external field.
Depending on the behavior of the magnetic field in the hydrodynamic limit, we
show that it can lead to further attenuation of sound waves in the (2+1)
dimensional conformal plasma, or reduce the speed of sound. We present both
field theory and dual supergravity descriptions of these phenomena. While to
the leading order in momenta the dispersion of the sound waves obtained from
the dual supergravity description agrees with the one predicted from field
theory, we find a discrepancy at higher order. This suggests that further
corrections to HKMS magneto-hydrodynamics are necessary.


title:
On the oscillation properties of eigenfunctions of Sturm--Liouville
  problem with singular coefficients

abstract:
  In the paper we consider singular spectral Sturm--Liouville problem
$-(py')'+(q-\lambda r)y=0$, $(U-1)y^{\vee}+i(U+1)y^{\wedge}=0$, where function
$p\in L_{\infty}[0,1]$ is uniformly positive, generalized functions $q,r\in
W_2^{-1}[0,1]$ are real-valued and unitary matrix $U\in\mathbb C^{2\times 2}$
is diagonal. The main goal is to prove that well-known (for smooth case) facts
about number and distribution of zeros of eigenfunctions hold in general case.


title:
Determination and prediction of the fretting crack initiation:
  introduction of the (P,Q,N) representation and definition of a variable
  process volume

abstract:
  In this work, the crack nucleation under fretting loading is investigated
experimentally with a damage tolerant 2024 aluminium alloy. A new method is
introduced to determine its condition with respect to all loading parameters
including the number of fretting cycles. Further work deals with the prediction
of this threshold using the Smith-Watson-Topper criterion. New developments are
presented, in particular a process volume of variable size is introduced in the
computations of the fretting crack initiation.


title:
The multi-band nonthermal emission from the supernova remnant RX
  J1713.7-3946

abstract:
  Nonthermal X-rays and very high-energy (VHE) $\gamma$-rays have been detected
from the supernova remnant (SNR) RX J1713.7-3946, and especially the recent
observations with the \textit{Suzaku} satellite clearly reveal a spectral
cutoff in the X-ray spectrum, which directly relates to the cutoff of the
energy spectrum of the parent electrons. However, whether the origin of the VHE
$\gamma$-rays from the SNR is hadronic or leptonic is still in debate. We
studied the multi-band nonthermal emission from RX J1713.7-3946 based on a
semi-analytical approach to the nonlinear shock acceleration process by
including the contribution of the accelerated electrons to the nonthermal
radiation. The results show that the multi-band observations on RX J1713.7-3946
can be well explained in the model with appropriate parameters and the TeV
$\gamma$-rays have hadronic origin, i.e., they are produced via proton-proton
(p-p) interactions as the relativistic protons accelerated at the shock collide
with the ambient matter.


title: Topological Symmetry And Existence of Partial Synchronization

abstract:
  We study the relationship between the partial synchronous (PaS) state and the
coupling structure in general dynamical systems. By the exact proof, we find
the sufficient and necessary condition of the existence of PaS state for the
coupling structure. Our result shows that the symmetry of the coupling
structure is not the equivalent condition which is supposed before but only the
sufficient condition. Furthermore, for the existence of the PaS state, the
general structure is the equal-degree random.


title: A first principle (3+1) dimensional model for microtubule polymerization

abstract:
  In this paper we propose a microscopic model to study the polymerization of
microtubules (MTs). Starting from fundamental reactions during MT's assembly
and disassembly processes, we systematically derive a nonlinear system of
equations that determines the dynamics of microtubules in 3D. %coexistence with
tubulin dimers in a solution. We found that the dynamics of a MT is
mathematically expressed via a cubic-quintic nonlinear Schrodinger (NLS)
equation. Interestingly, the generic 3D solution of the NLS equation exhibits
linear growing and shortening in time as well as temporal fluctuations about a
mean value which are qualitatively similar to the dynamic instability of MTs
observed experimentally. By solving equations numerically, we have found
spatio-temporal patterns consistent with experimental observations.


title:
Stellar Atmospheric Parameters: The Four-Step Program and Gaia's Radial
  Velocity Spectrometer

abstract:
  The determination of atmospheric parameters is the first and most fundamental
step in the analysis of a stellar spectrum. Current and forthcoming surveys
involve samples of up to several million stars, and therefore fully automated
approaches are required to handle not just data reduction but also the
analysis, and in particular the determination of atmospheric parameters. We
propose that a successful methodology needs, at the very least, to pass a
series of consistency tests that we dub the 'four-step program'. This and
related issues are discussed in some detail in the context of the massive data
set to be obtained with the Radial Velocity Spectrometer onboard Gaia


title:
On the implementation of exponential methods for semilinear parabolic
  equations

abstract:
  The time integration of semilinear parabolic problems by exponential methods
of different kinds is considered. A new algorithm for the implementation of
these methods is proposed. The algorithm evaluates the operators required by
the exponential methods by means of a quadrature formula that converges like
$O(e^{-cK/\ln K})$, with $K$ the number of quadrature nodes. The algorithm
allows also the evaluation of the associated scalar mappings and in this case
the quadrature converges like $O(e^{-cK})$. The technique is based on the
numerical inversion of sectorial Laplace transforms. Several numerical
illustrations are provided to test the algorithm.


title:
Tests of Chemical Enrichment Scenarios in Ellipticals Using Continuum
  Colors and Spectroscopy

abstract:
  We combine spectroscopic metallicity values with integrated narrowband
continuum colors to explore the internal metallicity distribution in early-type
galaxies. The different techniques for determining metallicity (indices versus
colors) allows for an estimate of the contribution from metal-poor stars in a
predominantly metal-rich population which, in turn, places constraints on the
shape and width of a galaxy's metallicity distribution function (MDF). The
color-spectroscopic data is compared to the closed box, infall and
inhomogeneous chemical evolution models. The G-dwarf problem, a deficiency in
metal-poor stars as compared to closed box models, is evident in the dataset
and indicates this deficiency is common to all early-type galaxies. However,
even simple infall models predict galaxy colors which are too blue compared to
the observations. A simple analytic model is proposed which matches the
elliptical data and recent HST observations of M31 (Worthey et al 2005) and NGC
5128 (Harris & Harris 2000) by reducing the number of metal-poor stars in a
systematic fashion. While without physical justification, the shape of these
models are similar to predictions of inhomogeneous enrichment scenarios.


title: Stress Tensors of Multiparticle Collision Dynamics Fluids

abstract:
  Stress tensors are derived for the multiparticle collision dynamics
algorithm, a particle-based mesoscale simulation method for fluctuating fluids,
resembling those of atomistic or molecular systems. Systems with periodic
boundary conditions as well as fluids confined in a slit are considered. For
every case, two equivalent expressions for the tensor are provided, the
internal stress tensor, which involves all degrees of freedom of a system, and
the external stress, which only includes the interactions with the confining
surfaces. In addition, stress tensors for a system with embedded particles are
determined. Based on the derived stress tensors, analytical expressions are
calculated for the shear viscosity. Simulations illustrate the difference in
fluctuations between the various derived expressions and yield very good
agreement between the numerical results and the analytically derived expression
for the viscosity.


title:
Magnetic Circular Dichroism spectroscopy in epitaxial La0.7Sr0.3MnO3
  thin films

abstract:
  Magneto optic measurements are a very powerful tool for investigating the
polarization of a conduction band as a function of temperature and are used
here to study the polarization of the mobile electrons in 50nm LSMO (x=0.3)
strained thin films grown epitaxially on single crystalline (001) LaAlO3 (LAO)
and (001) lattice matched substrate (LSAT). The magnetic circular dichroism
(MCD) has been investigated in magnetic fields up to 0.5 T and over a
temperature range (10 to 450 K). The MCD spectra of both the films show a peak
at the band gap at around 3 eV and the peak is found to be shifted towards
lower energy side with the increase of temperature. A separate polaron peak
(well known in insulating samples) appears at lower energy (about 1.8 eV) with
the increase of temperature in all these metallic films. The rapid decrease in
conduction band polarization in the film on LAO has strong implications for the
use of these manganites in room temperature spintronics.


title: Elementary combinatorics of the HOMFLYPT polynomial

abstract:
  We explore Jaeger's state model for the HOMFLYPT polynomial. We reformulate
this model in the language of Gauss diagrams and use it to obtain Gauss diagram
formulas for a two-parameter family of Vassiliev invariants coming from the
HOMFLYPT polynomial. These formulas are new already for invariants of degree 3.


title: How can one probe Podolsky Electrodynamics?

abstract:
  We investigate the possibility of detecting the Podolsky generalized
electrodynamics constant $a$. First we analyze an ion interferometry apparatus
proposed by B. Neyenhuis, et al (Phys. Rev. Lett. 99, (2007) 200401) who looked
for deviations from Coulomb's inverse-square law in the context of Proca model.
Our results show that this experiment has not enough precision for measurements
of $a$. In order to set up bounds for $a$ we investigate the influence of
Podolsky's electrostatic potential on the ground state of the Hydrogen atom.
The value of the ground state energy of the Hydrogen atom requires Podolsky's
constant to be smaller than 5.6 fm, or in energy scales larger than 35.51 MeV.


title: Extensions of Effective Medium Theory of Transport in Disordered Systems

abstract:
  Effective medium theory of transport in disordered systems, whose basis is
the replacement of spatial disorder by temporal memory, is extended in several
practical directions. Restricting attention to a 1-dimensional system with bond
disorder for specificity, a transformation procedure is developed to deduce,
from given distribution functions characterizing the system disorder, explicit
expressions for the memory functions. It is shown how to use the memory
functions in the Lapace domain forms in which they first appear, and in the
time domain forms which are obtained via numerical inversion algorithms, to
address time evolution of the system beyond the asymptotic domain of large
times normally treated. An analytic but approximate procedure is provided to
obtain the memories, in addition to the inversion algorithm. Good agreement of
effective medium theory predictions with numerically computed exact results is
found for all time ranges for the distributions used except near the
percolation limit as expected. The use of ensemble averages is studied for
normal as well as correlation observables. The effect of size on effective
mediumtheory is explored and it is shown that, even in the asymptotic limit,
finite size corrections develop to the well known harmonic mean prescription
for finding the effective rate. A percolation threshold is shown to arise even
in 1-d for finite (but not infinite) systems at a concentration of broken bonds
related to the system size. Spatially long range transfer rates are shown to
emerge naturally as a consequence of the replacement of spatial disorder by
temporal memories, in spite of the fact that the original rates possess nearest
neighbor character. Pausing time distributions in continuous time random walks
corresponding to the effective medium memories are calculated.


title:
Nuclear Structure Relevant to Neutrinoless Double Beta Decay: the
  Valence Protons in 76Ge and 76Se

abstract:
  The possibility of observing neutrinoless double beta decay offers the
opportunity of determining the effective neutrino mass if the nuclear matrix
element were known. Theoretical calculations are uncertain and the occupations
of valence orbits by nucleons active in the decay are likely to be important.
The occupation of valence proton orbits in the ground states of 76Ge, a
candidate for such decay, and 76Se, the corresponding daughter nucleus, were
determined by precisely measuring cross sections for proton-removing transfer
reactions. As in previous work on neutron occupations, we find that the Fermi
surface for protons is much more diffuse than previously thought, and the
occupancies of at least three orbits change significantly between the two 0+
ground states.


title:
Magnetic hyperthermia in single-domain monodisperse FeCo nanoparticles:
  Evidences for Stoner-Wohlfarth behaviour and large losses

abstract:
  We report on hyperthermia measurements on a colloidal solution of 15 nm
monodisperse FeCo nanoparticles (NPs). Losses as a function of the magnetic
field display a sharp increase followed by a plateau, which is what is expected
for losses of ferromagnetic single-domain NPs. The frequency dependence of the
coercive field is deduced from hyperthermia measurement and is in quantitative
agreement with a simple model of non-interacting NPs. The measured losses (1.5
mJ/g) compare to the highest of the literature, though the saturation
magnetization of the NPs is well below the bulk one.


title: Cosmic rays from Leptonic Dark Matter

abstract:
  If dark matter possesses a lepton number, it is natural to expect the
dark-matter annihilation and/or decay mainly produces the standard model
leptons, while negligible amount of the antiproton is produced. To illustrate
such a simple idea, we consider a scenario that a right-handed sneutrino dark
matter decays into the standard model particles through tiny R-parity violating
interactions. Interestingly enough, charged leptons as well as neutrinos are
directly produced, and they can lead to a sharp peak in the predicted positron
fraction. Moreover, the decay of the right-handed sneutrino also generates
diffuse continuum gamma rays which may account for the excess observed by
EGRET, while the primary antiproton flux can be suppressed. Those predictions
on the cosmic-ray fluxes of the positrons, gamma rays and antiprotons will be
tested by the PAMELA and FGST observatories.


title: Sagnac effect in a chain of mesoscopic quantum rings

abstract:
  The ability to interferometrically detect inertial rotations via the Sagnac
effect has been a strong stimulus for the development of atom interferometry
because of the potential 10^{10} enhancement of the rotational phase shift in
comparison to optical Sagnac gyroscopes. Here we analyze ballistic transport of
matter waves in a one dimensional chain of N coherently coupled quantum rings
in the presence of a rotation of angular frequency, \Omega. We show that the
transmission probability, T, exhibits zero transmission stop gaps as a function
of the rotation rate interspersed with regions of rapidly oscillating finite
transmission. With increasing N, the transition from zero transmission to the
oscillatory regime becomes an increasingly sharp function of \Omega with a
slope \partialT/\partial \Omega N^2. The steepness of this slope dramatically
enhances the response to rotations in comparison to conventional single ring
interferometers such as the Mach-Zehnder and leads to a phase sensitivity well
below the standard quantum limit.


title: Sums of residues on algebraic surfaces and application to coding theory

abstract:
  In this paper, we study residues of differential 2-forms on a smooth
algebraic surface over an arbitrary field and give several statements about
sums of residues. Afterwards, using these results we construct
algebraic-geometric codes which are an extension to surfaces of the well-known
differential codes on curves. We also study some properties of these codes and
extend to them some known properties for codes on curves.


title: Localization of maximal entropy random walk

abstract:
  We define a new class of random walk processes which maximize entropy. This
maximal entropy random walk is equivalent to generic random walk if it takes
place on a regular lattice, but it is not if the underlying lattice is
irregular. In particular, we consider a lattice with weak dilution. We show
that the stationary probability of finding a particle performing maximal
entropy random walk localizes in the largest nearly spherical region of the
lattice which is free of defects. This localization phenomenon, which is purely
classical in nature, is explained in terms of the Lifshitz states of a certain
random operator.


title: Exotic ccbar spectroscopy

abstract:
  We review the recent experimental results on the exotic charmoniumlike
states. Among them we discuss the X(3872), Y(3940), Z^\pm(4430) and Z^\pm_{1,2}
states found in B-meson decays, the X(3940) and X(4160) states produced in
double charmonium production and the Y(4260), Y(4325), Y(4660) and X(4630)
states produced with initial-state radiation in e^+e^- annihilation.


title: CP Violation in the Linear Sigma Model

abstract:
  Motivated by the possibility of the formation of CP-odd domains in heavy ion
collisions, we investigate the effects of CP violation on the chiral transition
within the linear sigma model with two flavors of quarks. We also study how the
CP-odd system is affected by the presence of a strong magnetic field, that is
presumably generated in a non-central heavy ion collision. We find that both
ingredients play an important role, influencing drastically the nature of the
phase transition and the critical temperature.


title:
Angular Dependence of Jet Quenching Indicates Its Strong Enhancement
  Near the QCD Phase Transition

abstract:
  We study dependence of jet quenching on matter density, using "tomography" of
the fireball provided by RHIC data on azimuthal anisotropy $v_2$ of high $p_t$
hadron yield at different centralities. Slicing the fireball into shells with
constant (entropy) density, we derive a "layer-wise geometrical limit"
$v_2^{max}$ which is indeed above the data $v_2<v_2^{max}$. Interestingly, the
limit is reached only if quenching is dominated by shells with the entropy
density exactly in the near-$T_c$ region. We show two models that
simultaneously describe the high $p_t$ $v_2$ and $R_{AA}$ data and conclude
that such a description can be achieved only if the jet quenching is few times
stronger in the near-$T_c$ region relative to QGP at $T>T_c$. One possible
reason for that may be recent indications that the near-$T_c$ region is a
magnetic plasma of relatively light color-magnetic monopoles.