title: A lattice study of light scalar tetraquarks with isopins 0, 1/2 and 1

abstract:
  The observed mass pattern of scalar resonances below 1 GeV gives preference
to the tetraquark assignment over the conventional $\bar qq$ assignment for
these states. We present a search for tetraquarks with isospins 0,1/2,1 in
lattice QCD, where isospin channels 1/2 and 1 have not been studied before. Our
simulation uses Chirally Improved fermions on quenched gauge configurations. We
determine three energy levels for each isospin using the variational method.
The ground state is consistent with the scattering state, while the two excited
states have energy above 2 GeV. Therefore we find no indication for light
tetraquarks at our range of pion masses 344-576 MeV.


title: A unit-cell approach to the nonlinear rheology of biopolymer solutions

abstract:
  We propose a nonlinear extension of the standard tube model for semidilute
solutions of freely-sliding semiflexible polymers. Non-affine filament
deformations at the entanglement scale, the renormalisation of direct
interactions by thermal fluctuations, and the geometry of large deformations
are systematically taken into account. The stiffening response predicted for
athermal solutions of stiff rods is found to be thermally suppressed. Instead,
we obtain a broad linear response regime, supporting the interpretation of
shear stiffening at finite frequencies in polymerised actin solutions as
indicative of coupling to longitudinal modes. We observe a destabilizing effect
of large strains (about 100%), suggesting shear banding as a plausible
explanation for the widely observed catastrophic collapse of in-vitro
biopolymer solutions, usually attributed to network damage. In combination with
friction-type interactions, our analysis provides an analytically tractable
framework to address the nonlinear viscoplasticity of biological tissue on a
molecular basis.


title: Testing Flavor Symmetries by B-Factory

abstract:
  Predictions of the Cabibbo-Kobayashi-Maskawa (CKM) parameters are
investigated in detail in recent predictive models which are based on
low-energy non-abelian discrete family symmetries. Some of the models can
already be excluded at the present precision of the determination of the CKM
parameters, while some of them seem to survive. We find that to make the
uncertainties in the predictions comparable with the assumed uncertainties of
$\sim 1^{\circ}$ and $\sim 2^{\circ}$ in $\phi_2$ and $\phi_3$, respectively,
at about 50 inverse atto barn achieved at a feature B factory, it is necessary
to reduce the uncertainties in the quark masses, especially that of the strange
quark mass by more than 60%.


title: Krajewski diagrams and the Standard Model

abstract:
  This paper provides a complete list of Krajewski diagrams representing the
standard model of particle physics. We will give the possible representations
of the algebra and the anomaly free lifts which provide the representation of
the standard model gauge group on the fermionic Hilbert space. The algebra
representations following from the Krajewski diagrams are not complete in the
sense that the corresponding spectral triples do not necessarily obey to the
axiom of Poincare duality. This defect may be repaired by adding new particles
to the model, i.e. by building models beyond the standard model. The aim of
this list of finite spectral triples (up to Poincare duality) is therefore to
provide a basis for model building beyond the standard model.


title: Sigma-drop in galaxies and the sigma-metallicity degeneracy

abstract:
  In some galaxies, the central velocity dispersion, sigma, is depressed with
respect to the surroundings. This sigma-drop phenomenon may have different
physical origins, bearing information about the internal dynamics of the host
galaxy. In this article, we stress the importance also of observational
artifacts due to the sigma-metallicity degeneracy: when a spectrum of a
population is compared with a template of miss-matched metallicity, the
velocity dispersion may be wrongly estimated. A sigma-drop may appear in place
of a metallicity peak. The discussion is illustrated using VLT/FORS spectra of
diffuse elliptical galaxies. Some of the sigma-drop galaxies reported in the
literature may be analysis artifacts.


title: On Kohn-Sham models with LDA and GGA exchange-correlation functionals

abstract:
  This article is concerned with the mathematical analysis of the Kohn-Sham and
extended Kohn-Sham models, in the local density approximation (LDA) and
generalized gradient approximation (GGA) frameworks. After recalling the
mathematical derivation of the Kohn-Sham and extended Kohn-Sham LDA and GGA
models from the Schr\"odinger equation, we prove that the extended Kohn-Sham
LDA model has a solution for neutral and positively charged systems. We then
prove a similar result for the spin-unpolarized Kohn-Sham GGA model for
two-electron systems, by means of a concentration-compactness argument.


title: Interrogation laser for a strontium lattice clock

abstract:
  We report on the setup and characterization of a 698 nm master-slave diode
laser system to probe the 1S0-3P0 clock transition of strontium atoms confined
in a one-dimensional optical lattice. A linewidth in the order of around 100 Hz
of the laser system has been measured with respect to an ultrastable 657 nm
diode laser with 1 Hz linewidth using a femtosecond fiber comb as transfer
oscillator. The laser has been used to measure the magnetically induced 1S0-3P0
clock transition in 88Sr where a linewidth of 165 Hz has been observed. The
transfer oscillator method provides a virtual beat signal between the two diode
lasers that has been used to phase lock the 698 nm laser to the 1 Hz linewidth
laser at 657 nm, transferring its stability to the 698 nm laser system.


title:
Magnetism, coherent many-particle dynamics, and relaxation with
  ultracold bosons in optical superlattices

abstract:
  We study how well magnetic models can be implemented with ultracold bosonic
atoms of two different hyperfine states in an optical superlattice. The system
is captured by a two-species Bose-Hubbard model, but realizes in a certain
parameter regime actually the physics of a spin-1/2 Heisenberg magnet,
describing the second order hopping processes. Tuning of the superlattice
allows for controlling the effect of fast first order processes versus the
slower second order ones.
  Using the density-matrix renormalization-group method, we provide the
evolution of typical experimentally available observables. The validity of the
description via the Heisenberg model, depending on the parameters of the
Hubbard model, is studied numerically and analytically. The analysis is also
motivated by recent experiments [S. Foelling et al., Nature 448, 1029 (2007);
S. Trotzky et al., Sience 319, 295 (2008)] where coherent two-particle dynamics
with ultracold bosonic atoms in isolated double wells were realized. We provide
theoretical background for the next step, the observation of coherent
many-particle dynamics after coupling the double wells. Contrary to the case of
isolated double wells, relaxation of local observables can be observed. The
tunability between the Bose-Hubbard model and the Heisenberg model in this
setup could be used to study experimentally the differences in equilibration
processes for nonintegrable and Bethe ansatz integrable models. We show that
the relaxation in the Heisenberg model is connected to a phase averaging
effect, which is in contrast to the typical scattering driven thermalization in
nonintegrable models. We discuss the preparation of magnetic groundstates by
adiabatic tuning of the superlattice parameters.


title: Effects of particle production during inflation

abstract:
  The impact of particle production during inflation on the primordial
curvature perturbation spectrum is investigated both analytically and
numerically. We obtain an oscillatory behavior on small scales, while on large
scales the spectrum is unaffected. The amplitude of the oscillations is
proportional to the number of coupled fields, their mass, and the square of the
coupling constant. The oscillations are due a discontinuity in the second time
derivative of the inflaton, arising from a temporary violation of the slow-roll
conditions. A similar effect on the power spectrum should be produced also in
other inflationary models where the slow-roll conditions are temporarily
violated.


title: Baryon Dissociation in a Strongly Coupled Plasma

abstract:
  Using the dual string theory, we study a circular baryonic configuration in a
wind of strongly coupled N=4 Yang-Mills plasma blowing in the plane of the
baryon, before and after a quark has dissociated from it. A simple enough model
that captures many interesting features is when there are four quarks in the
baryon. As a step towards phenomenology, we compare representative dissociated
configurations, and make some comments about their energetics and other
properties. Related results that we find include the observation that the
screening length formula L_s T ~ (1-v^2)^{1/4} obtained previously for other
color singlet configurations, is robust for circular baryons as well.


title: Reconstruction and Identification of Hadronic Tau Decays with ATLAS

abstract:
  The presence of tau leptons in the final state is an important signature in
many Higgs boson and SUSY searches. With the ATLAS detector, hadronically
decaying tau leptons can be reconstructed in a wide range of transverse
energies. The reconstruction algorithm for hadronically decaying tau leptons is
explained and the performance of tau lepton identification is shown.
Particularly important is the discrimination of hadronically decaying tau
leptons against overwhelming backgrounds from QCD jets.


title:
3D MIMO Scheme for Broadcasting Future Digital TV in Single Frequency
  Networks

abstract:
  This letter introduces a 3D space-time-space block code for future digital TV
systems. The code is based on a double layer structure for inter-cell and
intra-cell transmission mode in single frequency networks. Without increasing
the complexity of the receiver, the proposed code is very efficient for
different transmission scenarios.


title:
On exceptional collections on some log Del Pezzo surfaces with one
  singular point

abstract:
  In this paper we construct a full exceptional collection of sheaves on some
family of log Del Pezzo surfaces, viewed as a smooth stack. These surfaces can
be embedded as a quasi-smooth hypersurfaces into a certain weighted projective
space, and they are not toric.


title:
Characterization of entanglement in multiqubit systems via spin
  squeezing

abstract:
  Quantum entanglement reflects itself through non-local correlations among the
subsystems of a quantum system. This thesis focuses on constructing a complete
set of local invariants characterizing symmetric two qubit systems and
analyzing the pairwise entanglement properties like collective spin squeezing -
exhibited by multiqubits - in terms of two qubit entanglement invariants.
Further, the collective pairwise entanglement properties of symmetric
multiqubit states are shown to be captured entirely by the off diagonal block
of the covariance matrix.


title:
Problems with Modified Theories of Gravity, as Alternatives to Dark
  Energy

abstract:
  In this contribution to the conference "Beyond Einstein: Historical
Perspectives on Geometry, Gravitation and Cosmology in the Twentieth Century",
we give a critical status report of attempts to explain the late accelerated
expansion of the universe by modifications of general relativity. Our brief
review of such alternatives to the standard cosmological model addresses mainly
readers who have not pursued the vast recent literature on this subject.


title: On Issues in Swiss Cheese Compactifications

abstract:
  We give a brief review of our previous works: [1,2]. We discuss two sets of
issues. The first has to do with the possibility of getting a
non-supersymmetric dS minimum without the addition of anti-D3 branes as in
KKLT, and axionic slow-roll inflation, in type II flux compactifications. The
second has to do with the "Inverse Problem" [3] and "Fake Superpotentials" [4]
for extremal (non)supersymmetric black holes in type II compactifications. We
use (orientifold of) a "Swiss Cheese" Calabi-Yau [5] expressed as a degree-18
hypersurface in WCP^4[1,1,1,6,9] in the "large-volume-scenario" limit [6] for
the former.


title: An algebraic approach to the set of intervals

abstract:
  This paper is devoted to a new approach of the arithmetic of intervals. We
present the set of intervals as a normed vector space. We define also a
four-dimensional associative algebra whose product gives the product of
intervals in any cases. This approach allows to give a notion of divisibility
and in some cases an euclidian division. We introduce differential calculus and
give some applications.


title: RAVE- First Results and Second Data Release

abstract:
  RAVE, the RAdial Velocity Experiment, is an ambitious program to conduct a
survey to measure the radial velocities, metallicities and abundance ratios for
up to a million stars using the 1.2-m UK Schmidt Telescope of the
Anglo-Australian Observatory (AAO), over the period 2003 - 2010. The survey
represents a giant leap forward in our understanding of our own Milky Way
galaxy, providing a vast stellar kinematic database larger than any other
survey proposed for this coming decade. The main data product will be a
southern hemisphere survey of about a million stars. This survey would comprise
0.7 million thin disk main sequence stars, 250,000 thick disk stars, 100,000
bulge and halo stars, and a further 50,000 giant stars including some out to 10
kpc from the Sun. RAVE will offer the first truly representative inventory of
stellar radial velocities for all major components of the Galaxy. Here we
present the first scientific results of this survey as well as its second data
release which doubles the number of previously released radial velocities. For
the first time, the release also provides atmospheric parameters for a large
fraction of the 2nd year data making it an unprecedented tool to study the
formation of the Milky Way.


title: Tailoring PDC speckle structure

abstract:
  Speckle structure of parametric down conversion light has recently received a
large attention due to relevance in view of applications to quantum imaging
  The possibility of tailoring the speckle size by acting on the pump
properties is an interesting tool for the applications to quantum imaging and
in particular to the detection of weak object under shot-noise limit.
  Here we present a systematic detailed experimental study of the speckle
structure produced in type II PDC with particular attention to its variation
with pump beam properties.


title:
On a new multivariate sampling paradigm and a polyspline Shannon
  function

abstract:
  In the monograph Kounchev, O. I., Multivariate Polysplines. Applications to
Numerical and Wavelet Analysis, Academic Press, San Diego-London, 2001, and in
the paper Kounchev O., Render, H., Cardinal interpolation with polysplines on
annuli, Journal of Approximation Theory 137 (2005) 89--107, we have introduced
and studied a new paradigm for cardinal interpolation which is related to the
theory of multivariate polysplines. In the present paper we show that this is
related to a new sampling paradigm in the multivariate case, whereas we obtain
a Shannon type function $S(x) $ and the following Shannon type formula:
$f(r\theta) =\sum_{j=-\infty}^{\infty}\int_{\QTR{Bbb}{S}^{n-1}}S(e^{-j}r\theta
) f(e^{j}\theta) d\theta .$ This formula relies upon infinitely many Shannon
type formulas for the exponential splines arising from the radial part of the
polyharmonic operator $\Delta ^{p}$ for fixed $p\geq 1$. Acknowledgement. The
first and the second author have been partially supported by the Institutes
partnership project with the Alexander von Humboldt Foundation. The first has
been partially sponsored by the Greek-Bulgarian bilateral project BGr-17, and
the second author by Grant MTM2006-13000-C03-03 of the D.G.I. of Spain.


title: An Export Architecture for a Multimedia Authoring Environment

abstract:
  In this paper, we propose an export architecture that provides a clear
separation of authoring services from publication services. We illustrate this
architecture with the LimSee3 authoring tool and several standard publication
formats: Timesheets, SMIL, and XHTML.


title:
Spin Fluctuations and Unconventional Superconductivity in the Fe-based
  Oxypnictide Superconductor LaFeAsO_0.7 probed by 57Fe-NMR

abstract:
  We report $^{57}$Fe-NMR studies on the oxygen-deficient iron (Fe)-based
oxypnictide superconductor LaFeAsO$_{0.7}$ ($T_{c}=$ 28 K) enriched by
$^{57}$Fe isotope. In the superconducting state, the spin component of
$^{57}$Fe-Knight shift $^{57}K$ decreases almost to zero at low temperatures
and the nuclear spin-lattice relaxation rate $^{57}(1/T_{1})$ exhibits a
$T^{3}$-like dependence without the coherence peak just below $T_{c}$, which
give firm evidence of the unconventional superconducting state formed by
spin-singlet Cooper pairing. All these events below $T_c$ are consistently
argued in terms of the extended s$_{\pm}$-wave pairing with a sign reversal of
the order parameter among Fermi surfaces. In the normal state, we found the
remarkable decrease of $1/T_1T$ upon cooling for both the Fe and As sites,
which originates from the decrease of low-energy spectral weight of spin
fluctuations over whole ${\bm q}$ space upon cooling below room temperature.
Such behavior has never been observed for other strongly correlated
superconductors where an antiferromagnetic interaction plays a vital role in
mediating the Cooper pairing.


title: Effects of thickness in quantum dots at strong magnetic fields

abstract:
  We study the effects of thickness on the ground states of two-dimensional
quantum dots in high magnetic fields. To be specific, we assume the thickness
to be small so that only the lowest state in the corresponding direction is
occupied, but which however leads to a modification of the effective
interaction between the electrons. We find the ground state phase diagram and
demonstrate the emergence of new phases as the thickness is accounted for.
Finally, the wave functional form and vortex structure of different phases is
analyzed.


title: Nuclear clusters with Halo Effective Field Theory

abstract:
  After a brief discussion of effective field theory applied to nuclear
clusters, I present the aspect of Coulomb interactions, with applications to
low-energy alpha-alpha and nucleon-alpha scattering.


title:
Lepton Flavour Violating Heavy Higgs Decays Within the nuMSSM and Their
  Detection at the LHC

abstract:
  Within the $\nu$MSSM, a Minimal Supersymmetric neutrino See-saw Model, Lepton
Flavour Violating Higgs couplings are strongly enhanced at large $\tan\beta$
($\gsim30$), which can lead to BR$(H^0/A^0 \to \tau\mu) \simeq O(10^{-4})$, for
$M_{H^0/A^0}\gsim 160$ GeV. Enhancements on the production of Higgs bosons,
through the gluon fusion mechanism, $gg\to H^0/A^0$, and the associated
production channel $gg,q\bar q\to b\bar bH^0/A^0$, whose rates grow with
$\tan\beta$, as well as the mass degeneracy that occurs between the $H^0$ and
$A^0$ states in this regime, also contribute to further the possibilities to
detect a heavy Higgs signal into $\tau\mu$ pairs. We show that the separation
of $\tau\mu$ Higgs events from the background at the upcoming CERN Large Hadron
Collider could be done for Higgs masses up to about 600 GeV for 300 fb$^{-1}$
of luminosity, for large $\tan\beta$ values. However, even with as little as 10
fb$^{-1}$ one can probe $H^0/A^0$ masses up to 400 GeV or so, if
$\tan\beta=60$. Altogether, these processes then provide a new Higgs discovery
mode as well as an independent test of flavour physics.


title: On Polyharmonic Interpolation

abstract:
  In the present paper we will introduce a new approach to multivariate
interpolation by employing polyharmonic functions as interpolants, i.e. by
solutions of higher order elliptic equations. We assume that the data arise
from $C^{\infty}$ or analytic functions in the ball $B_{R}.$ We prove two main
results on the interpolation of $C^{\infty}$ or analytic functions $f$ in the
ball $B_{R}$ by polyharmonic functions $h$ of a given order of polyharmonicity
$p.$


title: Optical element for X-ray microscopy

abstract:
  We present a proposal for a X-ray optical element suitable for X-ray
microscopy and other X-ray-based display systems. Its principle is based on the
Fresnel lenses condition and the Bragg condition for X-ray scattering on a
slice of monocrystal. These conditions are fulfilled simultaneously due to a
properly machined shape of the monocrystal with a stress at its ends.


title:
A perturbative approach to inelastic collisions in a Bose-Einstein
  Condensate

abstract:
  It has recently been discovered that for certain rates of mode-exchange
collisions analytic solutions can be found for a Hamiltonian describing the
two-mode Bose-Einstein condensate. We proceed to study the behavior of the
system using perturbation theory if the coupling constants only approximately
match these parameter constraints. We find that the model is robust to such
perturbations. We study the effects of degeneracy on the perturbations and find
that the induced changes differ greatly from the non-degenerate case. We also
model inelastic collisions that result in particle loss or condensate decay as
external perturbations and use this formalism to examine the effects of
three-body recombination and background collisions.


title:
Evaluation of homogenized thermal conductivities of imperfect
  carbon-carbon textile composites using the Mori-Tanaka method

abstract:
  Three-scale homogenization procedure is proposed in this paper to provide
estimates of the effective thermal conductivities of porous carbon-carbon
textile composites. On each scale - the level of fiber tow (micro-scale), the
level of yarns (meso-scale) and the level of laminate (macro-scale) - a two
step homogenization procedure based on the Mori-Tanaka averaging scheme is
adopted. This involves evaluation of the effective properties first in the
absence of pores. In the next step, an ellipsoidal pore is introduced into a
new, generally orthotropic, matrix to make provision for the presence of crimp
voids and transverse and delamination cracks resulting from the thermal
transformation of a polymeric precursor into the carbon matrix. Other sources
of imperfections also attributed to the manufacturing processes, including
non-uniform texture of the reinforcements, are taken into consideration through
the histograms of inclination angles measured along the fiber tow path together
with a particular shape of the equivalent ellipsoidal inclusion. The analysis
shows that a reasonable agreement of the numerical predictions with
experimental measurements can be achieved.


title:
Inclusive Search for the SM Higgs Boson in the H->gammagamma channel at
  the LHC

abstract:
  A prospective for the inclusive search of the Standard Model Higgs boson in
the decay channel H->gammagamm is presented with the CMS experiment at the LHC.
The analysis relies on a strategy to determine the background characteristics
and systematics from data. The strategy is applied to a Monte Model of the QCD
background, with full simulation of the detector response. The discrimination
between signal and background exploits information on photon isolation and
kinematics. The resolution for the reconstructed Higgs boson mass profits from
the excellent energy resolution of the CMS crystal calorimeter. A discovery
significance above 5 sigma is expected at integrated LHC luminosities below 30
inverse femtobarn for Higgs boson masses below 140 GeV/c^2.


title:
Strong solutions of the incompressible Navier-Stokes equations in
  external domains: local existence and uniqueness

abstract:
  In this paper the problem of strong solvability of the incompressible
Navier-Stokes equations (INSE) is revisited, with the goal of determining the
minimal assumptions for the validity of a local existence and uniqueness
theorem for the Navier-Stokes fluid fields (solutions of INSE). Emphasis is
placed on fluid fields which, together with suitable derivatives, do not
necessarily decay at infinity and hence do not belong to Sobolev spaces. For
this purpose a novel approach based on a so-called inverse kinetic theory,
recently developed by Tessarotto and Ellero, is adopted. This requires the
construction of a suitable kinetic equation, advancing in time a suitably
smooth kinetic distribution function and providing exactly, as its moment
equations, the complete set of fluid equations. In turn, by proper definition
of the kinetic equation, this permits the introduction of the so-called
\textit{Navier-Stokes dynamical system}, i.e., the dynamical system which
advances in time self-consistently the Navier-Stokes fluid fields.
Investigation of the properties of this dynamical system is crucial for the
establishment of an existence and uniqueness theorem for strong solutions of
INSE. The new theorem applies both to bounded and unbounded domains and in the
presence of generalized boundaries, represented by surfaces, curves or even
sets of isolated points. In particular, for unbounded domains, solutions are
considered, which do not necessarily vanish at infinity. Basic consequences for
the functional setting of classical solutions are analyzed.
\keywords{Navier-Stokes equations \and Kinetic theory \and Dynamical systems}
PACS 47.10.ad,47.10.Fg,PACS 47.10.A- MSC 76D03,76D06


title: Spatial filtering of light by chirped photonic crystals

abstract:
  We propose an efficient method for spatial filtering of light beams by
propagating them through 2D (also 3D) longitudinally chirped photonic crystals,
i.e. through the photonic structures with fixed transverse lattice period and
with the longitudinal lattice period varying along the direction of the beam
propagation. We prove the proposed idea by numerically solving the paraxial
propagation equation in refraction index-modulated media, and we evaluate the
efficiency of the process by plane-wave-expansion analysis. The technique can
be applied to filter (to clean) the packages of atomic waves (Bose
condensates), as well improve the directionality of acoustic and mechanical
waves.


title:
Semiorthogonal decompositions of derived categories of equivariant
  coherent sheaves

abstract:
  Let X be an algebraic variety with an action of an algebraic group G. Suppose
X has a full exceptional collection of sheaves, and these sheaves are invariant
under the action of the group. We construct a semiorthogonal decomposition of
bounded derived category of G-equivariant coherent sheaves on X into
components, equivalent to derived categories of twisted representations of the
group. If the group is finite or reductive over the algebraically closed field
of zero characteristic, this gives a full exceptional collection in the derived
equivariant category. We apply our results to particular varieties such as
projective spaces, quadrics, Grassmanians and Del Pezzo surfaces.


title:
Accurate determination of the electric dipole matrix elements,
  lifetimes, polarizabilities and light-shift ratios in Ba+ and Ra+

abstract:
  We have employed the relativistic coupled-cluster theory to calculate the
electric dipole matrix elements in the singly ionized barium (Ba$^+$) and
radium (Ra$^+$). Matrix elements of Ba$^+$ are used to determine the
light-shift ratios for two different wavelengths on which recent experiments
are carried out. By combining the measured light-shift ratios and our
calculations, we are able to estimate possible errors associate with the used
matrix elements in Ba$^+$. Static polarizabilities of the low-lying states and
lifetimes of the first excited P-states are also determined using these matrix
elements in Ba$^+$. A similar approach has been followed to estimate the
lifetimes and light-shift ratios in Ra$^+$.


title:
Theoretical prediction of perfect spin filtering at interfaces between
  close-packed surfaces of Ni or Co and graphite or graphene

abstract:
  The in-plane lattice constants of close-packed planes of fcc and hcp Ni and
Co match that of graphite almost perfectly so that they share a common two
dimensional reciprocal space. Their electronic structures are such that they
overlap in this reciprocal space for one spin direction only allowing us to
predict perfect spin filtering for interfaces between graphite and (111) fcc or
(0001) hcp Ni or Co. First-principles calculations of the scattering matrix
show that the spin filtering is quite insensitive to amounts of interface
roughness and disorder which drastically influence the spin-filtering
properties of conventional magnetic tunnel junctions or interfaces between
transition metals and semiconductors. When a single graphene sheet is adsorbed
on these open $d$-shell transition metal surfaces, its characteristic
electronic structure, with topological singularities at the K points in the two
dimensional Brillouin zone, is destroyed by the chemical bonding. Because
graphene bonds only weakly to Cu which has no states at the Fermi energy at the
K point for either spin, the electronic structure of graphene can be restored
by dusting Ni or Co with one or a few monolayers of Cu while still preserving
the ideal spin injection property.


title: Phase Dynamics in Intrinsic Josephson Junctions and its Electrodynamics

abstract:
  We present a theoretical description of the phase dynamics and its
corresponding electrodynamics in a stack of inductively coupled intrinsic
Josephson junctions of layered high-$T_c$ superconductors in the absence of an
external magnetic field. Depending on the spatial structure of the gauge
invariant phase difference, the dynamic state is classified into: state with
kink, state without kink, and state with solitons. It is revealed that in the
state with phase kink, the plasma is coupled to the cavity and the plasma
oscillation is enhanced. In contrast, in the state without kink, the plasma
oscillation is weak. It points a way to enhance the radiation of
electromagnetic from high-$T_c$ superconductors. We also perform numerical
simulations to check the theory and a good agreement is achieved. The radiation
pattern of the state with and without kink is calculated, which may serve as a
fingerprint of the dynamic state realized by the system. At last, the power
radiation of the state with solitons is calculated by simulations. The possible
state realized in the recent experiments is discussed in the viewpoint of the
theoretical description. The state with kink is important for applications
including terahertz generators and amplifiers.


title: Electronic Raman scattering in non-centrosymmetric superconductors

abstract:
  We formulate a theory for the polarization-dependence of the electronic
(pair-breaking) Raman response for the recently discovered non-centrosymmetric
superconductors in the clean limit at zero temperature. Possible applications
include the systems CePt$_3$Si and Li$_2$Pd$_x$Pt$_{3-x}$B which reflect the
two important classes of the involved spin-orbit coupling. We provide
analytical expressions for the Raman vertices for these two classes and
calculate the polarization dependence of the electronic spectra. We predict a
two-peak structure and different power laws with respect to the unknown
relative magnitude of the singlet and triplet contributions to the
superconducting order parameter, revealing a large variety of characteristic
fingerprints of the underlying condensate.


title:
Evidence for powerful AGN winds at high redshift: Dynamics of galactic
  outflows in radio galaxies during the "Quasar Era"

abstract:
  AGN feedback now appears as an attractive mechanism to resolve some of the
outstanding problems with the "standard" cosmological models, in particular
those related to massive galaxies. To directly constrain how this may influence
the formation of massive galaxies near the peak in the redshift distribution of
powerful quasars, z~2, we present an analysis of the emission-line kinematics
of 3 powerful radio galaxies at z~2-3 (HzRGs) based on rest-frame optical
integral-field spectroscopy obtained with SINFONI on the VLT. HzRGs are among
the most massive galaxies, so AGN feedback may have a particularly clear
signature. We find evidence for bipolar outflows in all HzRGs, with kinetic
energies that are equivalent to 0.2% of the rest-mass of the supermassive black
hole. Velocity offsets in the outflows are ~800-1000 km s^-1 between the
blueshifted and redshifted line emission, FWHMs ~1000 km s^-1 suggest strong
turbulence. Ionized gas masses estimated from the Ha luminosity are of order
10^10 M_s, similar to the molecular gas content of HzRGs, underlining that
these outflows may indicate a significant phase in the evolution of the host
galaxy. The total energy release of ~10^60 erg during a dynamical time of ~10^7
yrs corresponds to about the binding energy of a massive galaxy. Geometry,
timescales and energy injection rates of order 10% of the kinetic energy flux
of the jet suggest that the outflows are most likely driven by the radio
source. The global energy density release of ~10^57 erg s^-1 Mpc^-3 may also
influence the subsequent evolution of the HzRG by enhancing the entropy and
pressure in the surrounding halo and facilitating ram-pressure stripping of gas
in satellite galaxies that may contribute to the subsequent mass assembly of
the HzRG through low-dissipation "dry" mergers.


title: Detection of Hot Gas in Galaxy Groups via the Sunyaev-Zel'dovich Effect

abstract:
  Motivated by the observed shortfall of baryons in the local universe, we
investigate the ability of high resolution cosmic microwave background (CMB)
experiments to detect hot gas in the outer regions of nearby group halos. We
construct hot gas models with the gas in hydrostatic equilibrium with the dark
matter and described by a polytropic equation of state. We also consider models
that add entropy to the gas in line with constraints from X-ray observations.
We calculate the thermal Sunyaev-Zel'dovich (SZ) signal in these halos and
compare it to the anticipated sensitivities of forthcoming SZ survey
experiments such as ACT, PLANCK and SPT. Using a multi-frequency Wiener filter
we derive SZ detectability limits as a function of halo mass and redshift in
the presence of galactic and extragalactic foregrounds and the CMB. We find
that group-sized halos with virial masses below 1e14 M_solar can be detected at
z < 0.05 with the threshold mass dropping to 3-4e13 M_solar at z < 0.01. The SZ
distortion of nearby group-sized halos can thus be mapped out to the virial
radius by these CMB experiments, beyond the sensitivity limits of X-ray
observations. These measurements will provide a unique probe of hot gas in the
outer regions of group halos, shedding insight into the local census of baryons
and the injection of entropy into the intragroup medium from non-gravitational
feedback.


title:
An algebraic approach to the set of intervals (a new approach of
  arithmetic of intervals)

abstract:
  In this paper we present the set of intervals as a normed vector space. We
define also a four-dimensional associative algebra whose product gives the
product of intervals in any cases. This approach allows to give a notion of
divisibility and in some cases an euclidian division. We introduce differential
calculus and give some applications.


title:
The Gamma--Ray Burst catalog obtained with the Gamma Ray Burst Monitor
  aboard BeppoSAX

abstract:
  We report on the catalog of Gamma--Ray Bursts (GRBs) detected with the Gamma
Ray Burst Monitor aboard the BeppoSAX satellite. It includes 1082 GRBs with
40--700 keV fluences in the range from $1.3\times 10^{-7}$ to $4.5\times
10^{-4}$ erg cm$^{-2}$, and with 40--700 keV peak fluxes from $3.7\times
10^{-8}$ to $7.0\times 10^{-5}$ erg cm$^{-2}$s$^{-1}$. We report in the catalog
some relevant parameters of each GRB and discuss the derived statistical
properties.


title:
Accounting for monopole configurations in Yang-Mills theory in three
  Euclidean dimensions

abstract:
  A gauge transformation provided by the three eigenfunctions of $\B^a(x) \cdot
\B^b(x)$ (where $\B^a(x)$, with a=1,2,3, are the non-Abelian magnetic fields)
exposes the topological configurations of the Yang-Mills fields. In particular,
it gives Dirac monopoles interacting with `photons' and massless charged vector
bosons. A magnetic dipole field at each monopole corresponds to infinitesimal
translation of the monopole, and provides the functional measure a la
collective coordinates. The grand canonical partition function of the monopole
plasma is exactly equivalent to a local field theory with certain scalar fields
interacting with the Yang-Mills fields. This integrates topological degrees of
freedom with perturbation theory.


title: Charm and Beauty Photoproduction at HERA

abstract:
  After the completion of data taking at HERA-2, a large data set is at hand to
study the photoproduction of charm and beauty quarks in ep collisions. New
measurements of charm production based on D^* meson tagging and beauty
production based on muon and electron reconstruction test perturbative QCD
calculations with improved accuracy. In general, QCD calculations at NLO
describe the data well. The scale uncertainties are, however, large and
dominate over the experimental uncertainties, calling for more precise
calculations.


title:
Asymptotics and analytic modes for the wave equation in similarity
  coordinates

abstract:
  We consider the radial wave equation in similarity coordinates within the
semigroup formalism. It is known that the generator of the semigroup exhibits a
continuum of eigenvalues and embedded in this continuum there exists a discrete
set of eigenvalues with analytic eigenfunctions. Our results show that, for
sufficiently regular data, the long time behaviour of the solution is governed
by the analytic eigenfunctions. The same techniques are applied to the linear
stability problem for the fundamental self--similar solution $\chi_T$ of the
wave equation with a focusing power nonlinearity. Analogous to the free wave
equation, we show that the long time behaviour (in similarity coordinates) of
linear perturbations around $\chi_T$ is governed by analytic mode solutions. In
particular, this yields a rigorous proof for the linear stability of $\chi_T$
with the sharp decay rate for the perturbations.


title: Ram-pressure stripped molecular gas in the Virgo spiral galaxy NGC 4522

abstract:
  IRAM 30m 12CO(1-0) and 12CO(2-1) HERA observations are presented for the
ram-pressure stripped Virgo spiral galaxy NGC 4522. The CO emission is detected
in the galactic disk and the extraplanar gas. The extraplanar CO emission
follows the morphology of the atomic gas closely but is less extended. The CO
maxima do not appear to correspond to regions where there is peak massive star
formation as probed by Halpha emission. The presence of molecular gas is a
necessary but not sufficient condition for star formation. Compared to the disk
gas, the molecular fraction of the extraplanar gas is 30% lower and the star
formation efficiency of the extraplanar gas is about 3 times lower. The
comparison with an existing dynamical model extended by a recipe for
distinguishing between atomic and molecular gas shows that a significant part
of the gas is stripped in the form of overdense arm-like structures. It is
argued that the molecular fraction depends on the square root of the total
large-scale density. Based on the combination of the CO/Halpha and an
analytical model, the total gas density is estimated to be about 4 times lower
than that of the galactic disk. Molecules and stars form within this dense gas
according to the same laws as in the galactic disk, i.e. they mainly depend on
the total large-scale gas density. Star formation proceeds where the local
large-scale gas density is highest. Given the complex 3D morphology this does
not correspond to the peaks in the surface density. In the absence of a
confining gravitational potential, the stripped gas arms will most probably
disperse; i.e. the density of the gas will decrease and star formation will
cease.


title:
Expository Remarks on Three-Dimensional Gravity and Hyperbolic
  Invariants

abstract:
  We consider complex invariants associated with compact real three-dimensional
hyperbolic spaces. The contribution of the Chern-Simons invariants of
irreducible U(n)-flat connections on hyperbolic fibered manifolds to the low
order expansion of the quantum gravitational path integral is analyzed.


title: Supergravities without an Action: Gauging the Trombone

abstract:
  We present a systematic account of supergravity theories in which the global
scaling symmetry is gauged. This generalizes the standard gaugings of
non-abelian off-shell symmetries. A particular feature of these theories is an
additional positive contribution to the effective cosmological constant.
  As the scaling symmetry is an on-shell symmetry, the resulting gaugings do no
longer possess an action. We develop the algebraic framework for the maximal
theories in various dimensions and construct explicit solutions to the
algebraic consistency constraints - related to `pure-spinor-like' structures
for the exceptional groups. As an example, we explicitly work out the modified
supersymmetry transformation rules and equations of motion in three dimensions.
Finally, we speculate about the role of these theories from the perspective of
very extended Kac-Moody algebras.


title:
Frustrated Further-Neighbor Antiferromagnetic and Electron-Hopping
  Interactions in the d=3 tJ Model: Finite-Temperature Global Phase Diagrams
  from Renormalization-Group Theory

abstract:
  The renormalization-group theory of the d=3 tJ model is extended to
further-neighbor antiferromagnetic or electron-hopping interactions, including
the ranges of frustration. The global phase diagram of each model is calculated
for the entire ranges of temperatures, electron densities, and
further/first-neighbor interaction strength ratios. In addition to the
\tau_{tJ} phase seen in earlier studies of the nearest-neighbor d=3 tJ model,
the \tau_{Hb} phase seen before in the d=3 Hubbard model appears both near and
away from half-filling. These distinct \tau phases potentially correspond to
different (BEC-like and BCS-like) superconducting phases.


title: Perturbation-based Distributed Beamforming for Wireless Relay Networks

abstract:
  This paper deals with distributed beamforming techniques for wireless
networks with half-duplex amplify-and-forward relays. Existing schemes optimize
the beamforming weights based on the assumption that channel state information
(CSI) is available at the relays. We propose to use adaptive beamforming based
on deterministic perturbations and limited feedback (1-bit) from the
destination to the relays in order to avoid CSI at the relays. Two scalable
perturbation schemes are considered and practical implementation aspects are
addressed. Simulation results confirm that the proposed techniques closely
approach optimum performance and have satisfactory tracking properties in
time-varying environments.


title:
Thermal detector model for cryogenic composite detectors for the dark
  matter experiments CRESST and EURECA

abstract:
  The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers)
and the EURECA (European Underground Rare Event Calorimeter Array) experiments
are direct dark matter search experiments where cryogenic detectors are used to
detect spin-independent, coherent WIMP (Weakly Interacting Massive
Particle)-nucleon scattering events by means of the recoil energy. The
cryogenic detectors use a massive single crystal as absorber which is equipped
with a TES (transition edge sensor) for signal read-out. They are operated at
mK-temperatures. In order to enable a mass production of these detectors, as
needed for the EURECA experiment, a so-called composite detector design (CDD)
that allows decoupling of the TES fabrication from the optimization procedure
of the absorber single-crystal was developed and studied. To further
investigate, understand and optimize the performance of composite detectors a
detailed thermal detector model which takes into account the CDD has been
developed.


title: Emergence of classicality in small number entangled systems

abstract:
  We show the transition from a fully quantized interaction to a semiclassical
one in entangled small number quantum systems using the quantum trajectories
approach. In particular, we simulate the microwave Ramsey zones used in Rydberg
atom interferometry, filling in the gap between the strongly entangling Jaynes
Cummings evolution and the semiclassical rotation of the atomic internal
states. We also correlate the information flowing with leaking photons to the
entanglement generation between cavity field and flying atom and detail the
roles played by the strong dissipation and the external driving force in
preserving atomic coherence through the interaction.


title: A generalization of the Neron models of Green, Griffiths and Kerr

abstract:
  We generalize a construction of the Neron model for a family of intermediate
Jacobians due to Green, Griffiths and Kerr by using the theory of mixed Hodge
modules. It is a topological group defined over any partial compactification of
the base space, and it `graphs' admissible normal functions. Moreover, there is
a stratification of the partial compactification such that the restriction over
each stratum is a complex Lie group over the stratum.


title:
An isomorphism between the fusion algebras of $V_L^+$ and type $D^{(1)}$
  level 2

abstract:
  The fusion algebra of the vertex operator algebra $V_L^+$ for a rank 1 even
lattice $L$ is explicitly shown to be isomorphic to the fusion algebra of the
Kac-Moody algebra of type $D^{(1)}$ at level 2 in almost all cases.


title:
Dynamics of diluted magnetic semiconductors from atomistic spin dynamics
  simulations: Mn doped GaAs as a case study

abstract:
  The dynamical behavior of the magnetism of diluted magnetic semiconductors
(DMS) has been investigated by means of atomistic spin dynamics simulations.
The conclusions drawn from the study are argued to be general for DMS systems
in the low concentration limit, although all simulations are done for 5%
Mn-doped GaAs with various concentrations of As antisite defects. The
magnetization curve, $M(T)$, and the Curie temperature $T_C$ have been
calculated, and are found to be in good correspondence to results from Monte
Carlo simulations and experiments. Furthermore, equilibrium and non-equilibrium
behavior of the magnetic pair correlation function have been extracted. The
dynamics of DMS systems reveals a substantial short ranged magnetic order even
at temperatures at or above the ordering temperature, with a non-vanishing pair
correlation function extending up to several atomic shells. For the high As
antisite concentrations the simulations show a short ranged anti-ferromagnetic
coupling, and a weakened long ranged ferromagnetic coupling. For sufficiently
large concentrations we do not observe any long ranged ferromagnetic
correlation. A typical dynamical response shows that starting from a random
orientation of moments, the spin-correlation develops very fast ($\sim$ 1ps)
extending up to 15 atomic shells. Above $\sim$ 10 ps in the simulations, the
pair correlation is observed to extend over some 40 atomic shells. The
autocorrelation function has been calculated and compared with ferromagnets
like bcc Fe and spin-glass materials. We find no evidence in our simulations
for a spin-glass behaviour, for any concentration of As antisites. Instead the
magnetic response is better described as slow dynamics, at least when compared
to that of a regular ferromagnet like bcc Fe.


title:
Analysis and Performance Comparison of DVB-T and DTMB Systems for
  Terrestrial Digital TV

abstract:
  Orthogonal frequency-division multiplexing (OFDM) is the most popular
transmission technology in digital terrestrial broadcasting (DTTB), adopted by
many DTTB standards. In this paper, the bit error rate (BER) performance of two
DTTB systems, namely cyclic prefix OFDM (CP-OFDM) based DVB-T and time domain
synchronous OFDM (TDS-OFDM) based DTMB, is evaluated in different channel
conditions. Spectrum utilization and power efficiency are also discussed to
demonstrate the transmission overhead of both systems. Simulation results show
that the performances of the two systems are much close. Given the same ratio
of guard interval (GI), the DVB-T outperforms DTMB in terms of signal to noise
ratio (SNR) in Gaussian and Ricean channels, while DTMB behaves better
performance in Rayleigh channel in higher code rates and higher orders of
constellation thanks to its efficient channel coding and interleaving scheme.


title:
A novel channel estimation based on spread pilots for terrestrial
  digital video broadcasting

abstract:
  In this paper, we propose a novel channel estimation technique based on
spread pilots for digital video broadcasting. This technique consists in adding
a linear preceding function before the OFDM modulation and dedicating one of
the preceding sequence to transmit the pilot symbols for the channel
estimation. The merits of this technique are its simplicity, its flexibility,
and the gains in terms of spectral efficiency and useful bit rate obtained
compared to the classical pilot based estimation schemes used in DVB standards.
The performance evaluated over realistic channel models, shows the efficiency
of this technique which turns out to be a promising channel estimation
technique for the future terrestrial video broadcasting systems.


title: Anisotropic Navier-Stokes equations in a bounded cylindrical domain

abstract:
  We study the global and local existence and uniqueness of solutions to the
Navier-Stokes equations with anisotropic viscosity in a bounded cylindrical
domain $Q=\Omega\times (0,1)$, where $\Omega$ is a star-shaped domain in $R^2$.
In this paper, we consider the case of homogeneous Dirichlet boundary
conditions on the lateral boundary and vanishing normal trace on the top and
the bottom.


title:
A Coded Bit-Loading Linear Precoded Discrete Multitone Solution for
  Power Line Communication

abstract:
  Linear precoded discrete multitone modulation (LP-DMT) system has been
already proved advantageous with adaptive resource allocation algorithm in a
power line communication (PLC) context. In this paper, we investigate the bit
and energy allocation algorithm of an adaptive LP-DMT system taking into
account the channel coding scheme. A coded adaptive LP-DMT system is presented
in the PLC context with a loading algorithm which ccommodates the channel
coding gains in bit and energy calculations. The performance of a concatenated
channel coding scheme, consisting of an inner Wei's 4-dimensional 16-states
trellis code and an outer Reed-Solomon code, in combination with the roposed
algorithm is analyzed. Simulation results are presented for a fixed target bit
error rate in a multicarrier scenario under power spectral density constraint.
Using a multipath model of PLC channel, it is shown that the proposed coded
adaptive LP-DMT system performs better than classical coded discrete multitone.


title: 2D Linear Precoded OFDM for future mobile Digital Video Broadcasting

abstract:
  In this paper, we propose a novel channel estimation technique based on 2D
spread pilots. The merits of this technique are its simplicity, its flexibility
regarding the transmission scenarios, and the spectral efficiency gain obtained
compared to the classical pilot based estimation schemes used in DVB standards.
We derive the analytical expression of the mean square error of the estimator
and show it is a function of the autocorrelation of the channel in both time
and frequency domains. The performance evaluated over a realistic channel model
shows the efficiency of this technique which turns out to be a promising
channel estimation for the future mobile video broadcasting systems.


title: Testing the Kochen-Specker theorem with Josephson qubits

abstract:
  We propose an experimental approach to {\it macro}scopically test the
Kochen-Specker theorem (KST) with superconducting qubits. This theorem, which
has been experimentally tested with single photons or neutrons, concerns the
conflict between the contextuality of quantum mechnaics (QM) and the
noncontextuality of hidden-variable theories (HVTs). We first show that two
Josephson charge qubits can be controllably coupled by using a two-level data
bus produced by a Josephson phase qubit. Next, by introducing an approach to
perform the expected joint quantum measurements of two separated Josephson
qubits, we show that the proposed quantum circuits could demonstrate quantum
contextuality by testing the KST at a macroscopic level.


title: Semi-Competing Risks on A Trivariate Weibull Survival Model

abstract:
  A setting of a trivairate survival function using semi-competing risks
concept is proposed. The Stanford Heart Transplant data is reanalyzed using a
trivariate Weibull distribution model with the proposed survival function.


title:
A Brownian Energy Depot Model of the Basilar Membrane Oscillation with a
  Braking Mechanism

abstract:
  High auditory sensitivity, sharp frequency selectivity, and otoacoustic
emissions are signatures of active amplification of the cochlea. The human ear
can also detect very large amplitude sound without being damaged as long as the
exposed time is not too long. The outer hair cells are believed as the best
candidate for the active force generator of the mammalian cochlea. In this
paper, we propose a new model for the basilar membrane oscillation which
successfully describes both the active and the protective mechanisms by
employing an energy depot concept and a critical velocity of the basilar
membrane. One of the main results is that thermal noise in the absence of
external stimulation can be amplified leading to the spontaneous basilar
membrane oscillation. The compressive response of the basilar membrane at the
characteristic frequency and the dynamic response to the stimulation are
consistent with the experimental results as expected. Our model also shows the
nonlinear distortion of the response of the basilar membrane.


title: Social Expansion versus Social Fragmentation

abstract:
  The process of social expansion in Europe can be better understood with
various concepts related to complexity science. Findings of exploratory
research show a typical process of social expansion in Europe within the period
1495-1945, in which wars have been instrumental. Furthermore, this research
enables the identification of vulnerabilities, and conditions for success in a
process of social expansion.


title:
Hydrodynamics of interaction of pulsar and stellar winds and its impact
  on the high energy radiation of binary pulsar systems

abstract:
  The hydrodynamics of the interaction of pulsar and stellar winds in binary
systems harboring a pulsar and its impact on the nonthermal radiation of the
binary pulsar PSR B1259-63/SS2883 is discussed. The collision of an
ultrarelativistic pulsar wind with a nonrelativistic stellar outflow results in
significant bulk acceleration of the shocked material from the pulsar wind.
Already at distances comparable to the size of the binary system, the Lorentz
factor of the shocked flow can be as large as $\gamma$~4. This results in
significant anisotropy of the inverse Compton radiation of accelerated
electrons. Because of the Doppler boosting of the produced radiation, one
should expect a variable gamma-ray signal from the system. In particular, this
effect may naturally explain the reported tendency of a decrease of TeV
gamma-ray flux close to the periastron. The modeling of the interaction of
pulsar and stellar winds allows self-consistent calculations of adiabatic
losses. Our results show that adiabatic losses dominate over the radiative
losses. These results have direct impact on the orbital variability of radio,
X-ray and gamma-ray signals detected from the binary pulsar PSR 1259-63/SS2883.


title: Bulk and surface localized states on a magnetic nonlinear impurity

abstract:
  We study localized modes on a single magnetic impurity positioned in the bulk
or at the surface of a one-dimensional chain, in the presence of a magnetic
field $B$ acting at the impurity site. The strong on-site nonlinear interaction
$U$ between two electrons of opposite spin at the impurity site, modelled here
as a nonlinear local term, and the presence of the external field induce a
strong correlation between parallel and anti-parallel spin bound states. We
find that, for an impurity in the bulk, a localized vector mode (with up and
down spin components) is always possible for any given value of $U$ and $B$,
while for a surface impurity, a minimum value of both, $U$ and $B$ is needed to
create a vector mode. In this case, up to two localized modes are possible, but
only one of them is stable. The presence of the surface seems to destabilize
the bulk mode in the parameter region U~B, creating a "forbidden strip" region
in parameter space, bounded by U=B+V and U=B-V, approximately.


title: The Quintuplet Cluster I. A K-band spectral catalog of stellar sources

abstract:
  Three very massive clusters are known to reside in the Galactic Center
region, the Arches cluster, the Quintuplet cluster and the Central parsec
cluster. We obtained spectroscopic observations of the Quintuplet cluster with
the Integral Field Spectrograph SINFONI-SPIFFI at the ESO-VLT. The spectral
range comprises the near-IR K-band from 1.94 to 2.45 micrometer. The 3D data
cubes of the individual fields were flux-calibrated and combined to one
contiguous cube, from which the spectra of all detectable point sources were
extracted. We present a catalog of 160 stellar sources in the inner part of the
Quintuplet cluster.


title: Spectral modeling of gaseous metal disks around DAZ white dwarfs

abstract:
  We report on our attempt for the first non-LTE modeling of gaseous metal
disks around single DAZ white dwarfs recently discovered by Gaensicke et al.
and thought to originate from a disrupted asteroid. We assume a Keplerian
rotating viscous disk ring composed of calcium and hydrogen and compute the
detailed vertical structure and emergent spectrum. We find that the observed
infrared CaII emission triplet can be modeled with a hydrogen-deficient gas
ring located at R=1.2 R_sun, inside of the tidal disruption radius, with Teff
about 6000 K and a low surface mass density of about 0.3 g/cm**2. A disk having
this density and reaching from the central white dwarf out to R=1.2 R_sun would
have a total mass of 7 10**21 g, corresponding to an asteroid with about 160 km
diameter.


title: Competing Risks Analysis on Times to Commit Crimes

abstract:
  A trivariate Weibull survival model using competing risks concept is applied
on studying recidivism of committing 3 types of crimes - sex, violent and
others. The assumption of independence of time to commit each type of crimes is
relaxed so that the association of the time to recidivism between any two types
of crimes can be evaluated. We found that the correlation of time to recidivism
between sex crimes and violent crimes are more correlated than other pairs.
Probability of experiencing a charged arrest of other crimes is greater than a
charged arrest of violent crimes followed by a charged arrest of sex crimes for
an individual after release.


title: Energy-momentum tensor correlators and viscosity

abstract:
  Collective flow has been observed in heavy ion collisions, with a large
anisotropic component, and ideal hydrodynamic calculations had significant
successful in describing the distribution of produced particles at the RHIC
experiments. In order to account for this near ideal fluid behavior, the shear
and bulk viscosity of the quark gluon plasma (QGP) must be computed from first
principles in a regime where the QGP is not weakly coupled. In this talk I
describe recent progress in computing energy-momentum tensor correlators on the
lattice from which the viscosities can be extracted via Kubo formulas. I also
show how to cumulate information from several channels, including at
non-vanishing spatial momentum, in order to best constrain the viscosities.
These methods should soon yield predictions at the higher temperatures that
will be explored at the LHC experiments.


title: Tables of the Appell Hypergeometric Functions $F_2$

abstract:
  The generalized hypergeometric function $_qF_p$ is a power series in which
the ratio of successive terms is a rational function of the summation index.
The Gaussian hypergeometric functions $_2F_1$ and $_3F_2$ are most common
special cases of the generalized hypergeometric function $_qF_p$. The Appell
hypergeometric functions $F_q$, $q=1,2,3,4$ are product of two hypergeometric
functions $_2F_1$ that appear in many areas of mathematical physics. Here, we
are interested in the Appell hypergeometric function $F_2$ which is known to
have a double integral representation. As demonstrated by Opps, Saad, and
Srivastava (J. Math. Anal. Appl. 302 (2005) 180-195), the double integral
representation of $F_2$ can be reduced to a single integral that can be easily
evaluated for certain values of the parameters in terms of $_2F_1$ and $_3F_2$.
Using many of the reduction formulas of $_2F_1$ and $_3F_2$ and the
representation of $F_2$ in terms of a single integral, we have begun to
tabulate new reduction formulas for $F_2$.


title: A Distributed MAC Protocol for Cooperation in Random Access Networks

abstract:
  WLAN is one of the most successful applications of wireless communications in
daily life because of low cost and ease of deployment. The enabling technique
for this success is the use of random access schemes for the wireless channel.
Random access requires minimal coordination between the nodes, which
considerably reduces the cost of the infrastructure. Recently, cooperative
communication in wireless networks has been of increasing interest because it
promises higher rates and reliability. An additional MAC overhead is necessary
to coordinate the nodes to allow cooperation and this overhead can possibly
cancel out the cooperative benefits. In this work, a completely distributed
protocol is proposed that allows nodes in the network to cooperate via Two-Hop
and Decode-and-Forward for transmitting their data to a common gateway node. It
is shown that high throughput gains are obtained in terms of the individual
throughput that can be guaranteed to any node in the network. These results are
validated by Monte Carlo simulations.


title: Algebraic group actions on noncommutative spectra

abstract:
  Let G be an affine algebraic group and let R be an associative algebra with a
rational action of G by algebra automorphisms. We study the induced G-action on
the spectrum Spec R of all prime ideals of R, viewed as a topological space
with the Jacobson-Zariski topology, and on the subspace consisting of all
rational ideals of R. Here, a prime ideal P of R is said to be rational if the
extended centroid of R/P is equal to the base field. The main themes of the
article are local closedness of G-orbits in Spec R and the so-called
G-stratification of Spec R. This stratification plays a central role in the
recent investigation of algebraic quantum groups, in particular in the work of
Goodearl and Letzter. We describe the G-strata in terms of certain commutative
spectra. Our principal results are based on prior work of Moeglin & Rentschler
and Vonessen. We generalize the theory arbitrary associative algebras while
also simplifying some of the earlier proofs.


title: Spectrum-Energy Correlations and Swift GRBs

abstract:
  The correlation between the photon energy at which the redshift corrected nFn
spectrum peaks (hence called "peak energy", Ep,i) and the isotropic equivalent
radiated energy (Eiso), is one of the most intriguing and debated observational
evidences in Gamma- Ray Bursts (GRB) astrophysics. In order to fully exploit
this correlation to understand GRB physics and use them as a cosmological tool,
we need to understand and reduce selection effects and biases in the sample of
GRBs with known redshift. The Swift satellite, thanks to its scientific payload
and unprecedented slewing capabilities, is providing us new observational
evidences and a reduction of selection effects in the process of GRB redshift
estimate. I discuss the location of Swift GRBs in the Ep,i-Eiso plane and the
main implications, with particular emphasis on selection effects, the existence
and nature of sub-energetic long GRBs, the GRB-SN connection, the difference
between long and short GRBs and the recently discovered sub-class of long GRBs
without association with a hypernova. I also briefly review the impact of Swift
observations on 3-parameters spectrum-energy correlations, which have been
proposed as a potentially powerful tool to standardize GRBs for the estimate of
cosmological parameters.


title: Search for neutrinoless double-beta decay of Ge-76 with GERDA

abstract:
  GERDA, the GERmanium Detector Array experiment, is a new double beta-decay
experiment which is currently under construction in the INFN National Gran
Sasso Laboratory (LNGS), Italy. It is implementing a new shielding concept by
operating bare Ge diodes - enriched in Ge-76 - in high purity liquid argon
supplemented by a water shield. The aim of GERDA is to verify or refute the
recent claim of discovery, and, in a second phase, to achieve a two orders of
magnitude lower background index than recent experiments. The paper discusses
motivation, physics reach, design and status of construction of GERDA, and
presents some R&D results.


title: Nonthermal fixed points and the functional renormalization group

abstract:
  Nonthermal fixed points represent basic properties of quantum field theories,
in addition to vacuum or thermal equilibrium fixed points. The functional
renormalization group on a closed real-time path provides a common framework
for their description. For the example of an O(N) symmetric scalar theory it
reveals a hierarchy of fixed point solutions, with increasing complexity from
vacuum and thermal equilibrium to nonequilibrium.


title: Visibility of ideal classes

abstract:
  Cremona, Mazur, and others have studied what they call visibility of elements
of Shafarevich-Tate groups of elliptic curves. The analogue for an abelian
number field $K$ is capitulation of ideal classes of $K$ in the minimal
cyclotomic field containing $K$. We develop a new method to study capitulation
and use it and classical methods to compute data with the hope of gaining
insight into the elliptic curve case. For example, the numerical data for
number fields suggests that visibility of nontrivial Shafarevich-Tate elements
might be much more common for elliptic curves of positive rank than for curves
of rank 0.


title:
Energy and System-size Dependence of Two-particle Azimuthal Correlations
  of High-pT Charged Hadrons at the CERN SPS

abstract:
  Angular correlations of high-pT hadrons can serve as a probe of interactions
of partons with the dense medium produced in high-energy heavy-ion collisions
but other sources of such correlations exist which can be non-negligible SPS
energies. In an attempt to determine the primary source, NA49 has performed an
energy and system-size scan of two-particle azimuthal correlations in central
Pb+Pb, Si+Si and p+p collisions at 158A GeV, as well as central Pb+Pb
collisions at 20A, 30A, 40A and 80A GeV. Moreover, results at 158A GeV have
been compared to UrQMD simulations.


title:
Supersymmetric Grand Unification and Lepton Universality in K-> l \nu
  Decays

abstract:
  Motivated by the prospects for an improved test of lepton universality in K
-> l \nu decays by the NA62 experiment at CERN, we study predictions for the
possible lepton non-universality in K -> l \nu decays in supersymmetric models.
Violations of \mu-e universality in this process may originate from mixing
effects in the right-handed slepton sector, providing a unique window into this
aspect of supersymmetric flavour physics in the large-\tan\beta region. Minimal
unification scenarios with universal soft supersymmetry-breaking terms at the
GUT scale would predict negligible violation of lepton universality. However,
lepton non-universality may be observable in non-minimal grand unified models
with higher-dimensional terms contributing to fermion masses, in which case
renormalization effects above the GUT scale may enhance the mixing among the
right-handed sleptons. This could leads to observable lepton non-universality
in K -> l \nu decays in specific regions of the parameter space with high \tan
\beta, large A terms and small charged Higgs boson mass. Observable
non-universality in K -> l \nu decays would be correlated with a large value of
BR(\tau -> e \gamma). The experimental upper limit on the electric dipole
moment of the electron could be reconciled with leptogenesis, if the latter
occurs at a relatively low scale, which would also alleviate the cosmological
gravitino problem. Even if lepton non-universality is not seen in the near
future, one may nevertheless obtain significant constraints on the model
parameters and unknown aspects of right-handed fermion and sfermion mixing.


title: Secrecy Capacity over Correlated Ergodic Fading Channel

abstract:
  We investigate the secrecy capacity of an ergodic fading wiretap channel in
which the main channel is correlated with the eavesdropper channel. In this
study, the full Channel State Information (CSI) is assumed, and thus the
transmitter knows the channel gains of the legitimate receiver and the
eavesdropper. By analyzing the resulting secrecy capacity we quantify the loss
of the secrecy capacity due to the correlation. In addition, we study the
asymptotic behavior of the secrecy capacity as Signal-to-Noise Ratio (SNR)
tends to infinity. The capacity of an ordinary fading channel logarithmically
increases with SNR. On the contrary, the secrecy capacity converges into a
limit which can be an upper bound on the secrecy capacity over the fading
wiretap channel. We find a closed form of the upper bound for the correlated
Rayleigh wiretap channel which also includes the independent case as a special
one. Our work shows that the upper bound is determined by only two channel
parameters; the correlation coefficient and the ratio of the main to the
eavesdropper channel gains that will be called PCC and CGR respectively. The
analysis of the upper bound tells how the two channel parameters affect the
secrecy capacity and leads to the conclusion that the excessively large signal
power does not provide any advantage in the secrecy capacity, and the loss due
to the correlation is especially serious in low CGR regime.


title: Inversion of spinning sound fields

abstract:
  A method is presented for the reconstruction of rotating monopole source
distributions using acoustic pressures measured on a sideline parallel to the
source axis. The method requires no \textit{a priori} assumptions about the
source other than that its strength at the frequency of interest vary
sinusoidally in azimuth on the source disc so that the radiated acoustic field
is composed of a single circumferential mode. When multiple azimuthal modes are
present, the acoustic field can be decomposed into azimuthal modes and the
method applied to each mode in sequence.
  The method proceeds in two stages, first finding an intermediate line source
derived from the source distribution and then inverting this line source to
find the radial variation of source strength. A far-field form of the radiation
integrals is derived, showing that the far field pressure is a band-limited
Fourier transform of the line source, establishing a limit on the quality of
source reconstruction which can be achieved using far-field measurements. The
method is applied to simulated data representing wind-tunnel testing of a
ducted rotor system (tip Mach number~0.74) and to control of noise from an
automotive cooling fan (tip Mach number~0.14), studies which have appeared in
the literature of source identification.


title:
Spontaneous polarisation of the neutral interface for valence asymmetric
  coulombic systems

abstract:
  In this paper, we discuss the phenomenon of a spontaneous polarisation of a
neutral hard planar interface for valence asymmetric coulombic systems. Within
a field theoretical description, we account for the existence of non trivial
charge density and electric potential profiles. The analysis of the phenomenon
shows that the effect is related to combinatorics in relation with the
existence of the two independent species cations and anions. This simple and
basic feature is related to the quantum mechanical properties of the system.
The theoretical results are compared with numerical simulations data and are
shown to be in very good agreement, which a fortiori justifies our physical
interpretation.


title: Coordinate Data and Stars Identification in Astrophysical Catalogs

abstract:
  The aim of our paper is to make high-precision positional stellar catalogs by
compiling large astrophysical data bulk and large astrometrical surveys. The
data reliability and uniqueness is the primary request. The common precision of
1 arc sec in coordinates is insufficient now to guarantee the simple
identification of stars. Therefore the technique of catalogs verification
become relevant. The paper presents the outcome of stars identification in The
Henry Draper Extension Charts catalog and Variable stars catalog using proper
method. Examples of conflicts permission concerning doubles and multiples stars
in astrophysical catalogs are discussed.


title:
Macrostates thermodynamics and its stable classical limit in Global
  One-Dimensional Quantum General Relativity

abstract:
  Global One--Dimensional Quantum General Relativity is the toy model with
nontrivial field theoretical content, describing classical one-dimensional
massive bosonic fields related to any 3+1 metric, where the dimension is a
volume of three-dimensional embedding. In fact it constitutes the
midisuperspatial Quantum Gravity model. We use one-particle density operator
method in order to building macrostates thermodynamics related with any 3+1
metric. Taking the Boltzmann gas limit, which is given by the energy
equipartition law for the Bose-Einstein gas of space quantum states generated
from the Bogoliubov vacuum, we receive consistent with General Relativity
thermodynamical degrees of freedom number. It confirms that the proposed
Quantum Gravity toy model has well-defined classical limit in accordance with
classical gravity theory.


title:
Linear Universal Decoding for Compound Channels: a Local to Global
  Geometric Approach

abstract:
  Over discrete memoryless channels (DMC), linear decoders (maximizing additive
metrics) afford several nice properties. In particular, if suitable encoders
are employed, the use of decoding algorithm with manageable complexities is
permitted. Maximum likelihood is an example of linear decoder. For a compound
DMC, decoders that perform well without the channel's knowledge are required in
order to achieve capacity. Several such decoders have been studied in the
literature. However, there is no such known decoder which is linear. Hence, the
problem of finding linear decoders achieving capacity for compound DMC is
addressed, and it is shown that under minor concessions, such decoders exist
and can be constructed. This paper also develops a "local geometric analysis",
which allows in particular, to solve the above problem. By considering very
noisy channels, the original problem is reduced, in the limit, to an inner
product space problem, for which insightful solutions can be found. The local
setting can then provide counterexamples to disproof claims, but also, it is
shown how in this problem, results proven locally can be "lifted" to results
proven globally.


title: Gravitational multi-NUT solitons, Komar masses and charges

abstract:
  Generalising expressions given by Komar, we give precise definitions of
gravitational mass and solitonic NUT charge and we apply these to the
description of a class of Minkowski-signature multi-Taub-NUT solutions without
rod singularities. A Wick rotation then yields the corresponding class of
Euclidean-signature gravitational multi-instantons.


title: Theoretical update on low energy neutrino-nucleus reactions

abstract:
  We review Quasielastic (QE) inclusive and semi--inclusive
neutrino/antineutrino Charged Current (CC) and Neutral Current (NC) induced
nuclear reactions at intermediate energies. We pay special attention to nuclear
corrections besides Pauli blocking: Long and Short range nuclear correlations
(RPA and SRC) and particle and hole Spectral Functions (SF). We also critically
review the use of the Plane and Distorted Wave Impulse approximations (PWIA and
DWIA) to describe inclusive one nucleon knockout reactions off nuclei. In this
context, we present results from a Monte Carlo cascade method to account for
the rescattering of the outgoing nucleon. Finally, we examine the effects of
chiral non-resonant terms in neutrino pion production off the nucleon, and
present some preliminary results on nuclear coherent pion production induced by
neutrinos.


title: Vortices in self-gravitating disks

abstract:
  Vortices are believed to greatly help the formation of km sized planetesimals
by collecting dust particles in their centers. However, vortex dynamics is
commonly studied in non-self-gravitating disks. The main goal here is to
examine the effects of disk self-gravity on the vortex dynamics via numerical
simulations. In the self-gravitating case, when quasi-steady gravitoturbulent
state is reached, vortices appear as transient structures undergoing recurring
phases of formation, growth to sizes comparable to a local Jeans scale, and
eventual shearing and destruction due to gravitational instability. Each phase
lasts over 2-3 orbital periods. Vortices and density waves appear to be coupled
implying that, in general, one should consider both vortex and density wave
modes for a proper understanding of self-gravitating disk dynamics. Our results
imply that given such an irregular and rapidly changing, transient character of
vortex evolution in self-gravitating disks it may be difficult for such
vortices to effectively trap dust particles in their centers that is a
necessary process towards planet formation.


title: Detecting Majorana nature of neutrinos in muon and tau decay

abstract:
  The Majorana nature of neutrinos can be detected by the precise measurement
of muon decay. This possibility comes from the presence of charged Higgs boson
interaction for Majorana neutrinos. We study the effects of the neutrino Yukawa
interaction via charged Higgs bosons in muon decay processes such as $\mu\to
e\nu\bar{\nu}$ and $\mu\to e\gamma$. The Higgs triplet model with small vacuum
expectation value is of special importance whose neutrino Yukawa coupling can
affect significantly muon decays. External neutrino lines in the Feynman
diagrams of $\mu\to e\nu\bar{\nu}$ can be crossed because of its Majorana
nature. This fact provides the interference contribution between the W boson
exchange diagram and that of charged Higgs boson, which may be detectable in
near future experiments.


title: Entangled light from Bose-Einstein condensates

abstract:
  We propose a method to generate entangled light with a Bose-Einstein
condensate trapped in a cavity, a system realized in recent experiments. The
atoms of the condensate are trapped in a periodic potential generated by a
cavity mode. The condensate is continuously pumped by a laser and spontaneously
emits a pair of photons of different frequencies in two distinct cavity modes.
In this way, the condensate mediates entanglement between two cavity modes
which leak out and can be separated and exhibit continuous variable
entanglement. The scheme exploits the experimentally demonstrated strong,
steady and collective coupling of condensate atoms to a cavity field.


title: Random template banks and relaxed lattice coverings

abstract:
  Template-based searches for gravitational waves are often limited by the
computational cost associated with searching large parameter spaces. The study
of efficient template banks, in the sense of using the smallest number of
templates, is therefore of great practical interest. The "traditional" approach
to template-bank construction requires every point in parameter space to be
covered by at least one template, which rapidly becomes inefficient at higher
dimensions. Here we study an alternative approach, where any point in parameter
space is covered only with a given probability < 1. We find that by giving up
complete coverage in this way, large reductions in the number of templates are
possible, especially at higher dimensions. The prime examples studied here are
"random template banks", in which templates are placed randomly with uniform
probability over the parameter space. In addition to its obvious simplicity,
this method turns out to be surprisingly efficient. We analyze the statistical
properties of such random template banks, and compare their efficiency to
traditional lattice coverings. We further study "relaxed" lattice coverings
(using Zn and An* lattices), which similarly cover any signal location only
with probability < 1. The relaxed An* lattice is found to yield the most
efficient template banks at low dimensions (n < 10), while random template
banks increasingly outperform any other method at higher dimensions.


title:
Families of rationally simply connected varieties over surfaces and
  torsors for semisimple groups

abstract:
  Under suitable hypotheses, we prove that a form of a projective homogeneous
variety $G/P$ defined over the function field of a surface over an
algebraically closed field has a rational point. The method uses an
algebro-geometric analogue of simple connectedness replacing the unit interval
by the projective line. As a consequence, we complete the proof of Serre's
Conjecture II in Galois cohomology for function fields over an algebraically
closed field.


title:
Modeling Fish Biomass Structure at Near Pristine Coral Reefs and
  Degradation by Fishing

abstract:
  Until recently, the only examples of inverted biomass pyramids have been in
freshwater and marine planktonic communities. In 2002 and 2008 investigators
documented inverted biomass pyramids for nearly pristine coral reef ecosystems
within the NW Hawaiian islands and the Line Islands, where apex predator
abundance comprises up to 85% of the fish biomass. We build a new refuge based
predator-prey model to study the fish biomass structure at coral reefs and
investigate the effect of fishing on biomass pyramids. Utilizing realistic life
history parameters of coral reef fish, our model exhibits a stable inverted
biomass pyramid. Since the predators and prey are not well mixed, our model
does not incorporate homogeneous mixing and the inverted biomass pyramid is a
consequence of the refuge. Understanding predator-prey dynamics in nearly
pristine conditions provides a more realistic historical framework for
comparison with fished reefs. Finally, we show that fishing transforms the
inverted biomass pyramid to be bottom heavy.


title:
On the problem of inflation in nonlinear multidimensional cosmological
  models

abstract:
  We consider a multidimensional cosmological model with nonlinear quadratic
$R^2$ and quartic $R^4$ actions. As a matter source, we include a monopole form
field, D-dimensional bare cosmological constant and tensions of branes located
in fixed points. In the spirit of the Universal Extra Dimensions models, the
Standard Model fields are not localized on branes but can move in the bulk. We
define conditions which ensure the stable compactification of the internal
space in zero minimum of the effective potentials. Such effective potentials
may have rather complicated form with a number of local minima, maxima and
saddle points. Then, we investigate inflation in these models. It is shown that
$R^2$ and $R^4$ models can have up to 10 and 22 e-foldings, respectively. These
values are not sufficient to solve the homogeneity and isotropy problem but big
enough to explain the recent CMB data. Additionally, $R^4$ model can provide
conditions for eternal topological inflation. However, the main drawback of the
given inflationary models consists in a value of spectral index $n_s$ which is
less than observable now $n_s\approx 1$. For example, in the case of $R^4$
model we find $n_s \approx 0.61$.


title: Stochastic quantization at nonzero chemical potential

abstract:
  Lattice QCD at finite chemical potential is difficult due to the sign
problem. We use stochastic quantization and complex Langevin dynamics to study
this issue. First results for QCD in the hopping expansion are encouraging.
U(1) and SU(3) one link models are used to gain further insight into why the
method appears to be successful.


title:
The finite-temperature phase structure of lattice QCD with twisted-mass
  Wilson fermions

abstract:
  We report progress in our exploration of the finite-temperature phase
structure of two-flavour lattice QCD with twisted-mass Wilson fermions and a
tree-level Symanzik-improved gauge action for a temporal lattice size
N_{\tau}=8. Extending our investigations to a wider region of parameter space
we gain a global view of the rich phase structure. We identify the finite
temperature transition/crossover for a non-vanishing twisted-mass parameter in
the neighbourhood of the zero-temperature critical line at sufficiently high
\beta. Our findings are consistent with Creutz's conjecture of a conical shape
of the finite temperature transition surface. Comparing with NLO lattice chiral
perturbation theory we achieve an improved understanding of this shape.


title:
Lifshitz theory of atom-wall interaction with applications to quantum
  reflection

abstract:
  The Casimir-Polder interaction of an atom with a metallic wall is
investigated in the framework of the Lifshitz theory. It is demonstrated that
in some temperature (separation) region the Casimir-Polder entropy takes
negative values and goes to zero when the temperature vanishes. This result is
obtained both for an ideal metal wall and for real metal walls. Simple
analytical representations for the Casimir-Polder free energy and force are
also obtained. These results are used to make a comparison between the
phenomenological potential used in the theoretical description of quantum
reflection and exact atom-wall interaction energy, as given by the Lifshitz
theory. Computations are performed for the atom of metastable He${}^{\ast}$
interacting with metal (Au) and dielectric (Si) walls. It is shown that the
relative differences between the exact and phenomenological interaction
energies are smaller in the case of a metallic wall. This is explained by the
effect of negative entropy which occurs only for a metal wall. More accurate
atom-wall interaction energies computed here can be used for the interpretation
of measurement data in the experiments on quantum reflection.


title:
SU(2) approach to the pseudogap phase of high-temperature
  superconductors: electronic spectral functions

abstract:
  We use an SU(2) mean-field theory approach with input from variational
wavefunctions of the t-J model to study the electronic spectra in the pseudogap
phase of cuprates. In our model, the high-temperature state of underdoped
cuprates is realized by classical fluctuations of the order parameter between
the d-wave superconductor and the staggered-flux state. Spectral functions of
the intermediate and the averaged states are computed and analyzed. Our model
predicts a photoemission spectrum with an asymmetric gap structure
interpolating between the superconducting gap centered at the Fermi energy and
the asymmetric staggered-flux gap. This asymmetry of the gap changes sign at
the point where the Fermi surface crosses the diagonal (\pi,0)-(0,\pi).


title: Neutrino energy quantization in rotating medium

abstract:
  Exact solution of the modified Dirac equation in rotating medium is found in
polar coordinates in the limit of vanishing neutrino mass. The solution for the
active left-handed particle exhibit properties similar to those peculiar for
the charged particle moving in the presence of a constant magnetic field.
Accordingly, the particle in the rotating matter has circle orbits with energy
levels, analogous to the Landau levels in magnetic field. The relevant physical
realization of the problem is motion of neutrino inside the rotating neutron
star. The feature of such motion to form binding states leads to the prediction
of the new mechanism for neutrino trapping. The solution found can be used for
detailed description of relativistic and nearly massless neutrino dynamics in
neutron stars. Results obtained further develop the "method of exact solutions"
in application to particle interactions in presence of dense matter.


title: Exact solution of two classes of prudent polygons

abstract:
  Prudent walks are self-avoiding walks on the square lattice which never step
into the direction of an already occupied vertex. We study the closed version
of these walks, called prudent polygons, where the last vertex is adjacent to
the first one. More precisely, we give the half-perimeter generating functions
of two subclasses of prudent polygons, which turn out to be algebraic and
non-D-finite, respectively.


title: Perspectives on Interstellar Dust Inside and Outside of the Heliosphere

abstract:
  Measurements by dust detectors on interplanetary spacecraft appear to
indicate a substantial flux of interstellar particles with masses exceeding
10^{-12}gram. The reported abundance of these massive grains cannot be typical
of interstellar gas: it is incompatible with both interstellar elemental
abundances and the observed extinction properties of the interstellar dust
population. We discuss the likelihood that the Solar System is by chance
located near an unusual concentration of massive grains and conclude that this
is unlikely, unless dynamical processes in the ISM are responsible for such
concentrations. Radiation pressure might conceivably drive large grains into
"magnetic valleys". If the influx direction of interstellar gas and dust is
varying on a ~10 yr timescale, as suggested by some observations, this would
have dramatic implications for the small-scale structure of the interstellar
medium.


title:
Structure of large spin expansion of anomalous dimensions at strong
  coupling

abstract:
  The anomalous dimensions of planar N=4 SYM theory operators like tr(Phi D^S
Phi) expanded in large spin S have the asymptotics \gamma= f ln S + f_c + 1/S
(f_11 ln S + f_10) + ..., where f (the universal scaling function or cusp
anomaly), f_c and f_mn are given by power series in the `t Hooft coupling
\lambda. The subleading coefficients appear to be related by the so called
functional relation and parity invariance (or reciprocity) property of the
function expressing \gamma in terms of the conformal spin of the collinear
group. Here we study the structure of such large spin expansion at strong
coupling via AdS/CFT, i.e. by using the dual description in terms of folded
spinning string in AdS_5. The large spin expansion of the classical string
energy happens to have the same structure as that of \gamma in the perturbative
gauge theory. Moreover, the functional relation and the reciprocity constraints
on the coefficients are also satisfied. We compute the leading string 1-loop
corrections to the coefficients f_c, f_11, f_10 and verify the
functional/reciprocity relations at subleading \lambda^{-1/2} order. This
provides a strong indication that these relations hold not only in weak
coupling (gauge-theory) but also in strong coupling (string-theory)
perturbative expansions.


title:
Renormalization-group approach to transverse-momentum dependent parton
  distribution functions in QCD

abstract:
  We discuss the renormalization of gauge-invariant transverse-momentum
dependent (TMD), i.e., unintegrated, parton distribution functions (PDFs) and
carry out the calculation of their anomalous dimension at one loop. We show
that in the light-cone gauge, TMD PDFs contain UV divergences that may be
attributed to the renormalization effect on a cusp-like junction point of the
gauge contours at infinity. In order to eliminate the anomalous dimension
ensuing from this cusp, we propose to use in the definition of the TMD PDFs, a
soft counter term in terms of a path-ordered phase factor along a particular
cusped contour extending to transverse light-cone infinity and comprising
light-like and transverse segments. We argue that this additional factor is
analogous to the "intrinsic" Coulomb phase factor found before in QED.


title: What is the maximum rate at which entropy of a string can increase?

abstract:
  According to Susskind, a string falling toward a black hole spreads
exponentially over the stretched horizon due to repulsive interactions of the
string bits. In this paper such a string is modeled as a self-avoiding walk and
the string entropy is found. It is shown that the rate at which
information/entropy contained in the string spreads is the maximum rate allowed
by quantum theory. The maximum rate at which the black hole entropy can
increase when a string falls into a black hole is also discussed.


title: Chiral Symmetry and light resonances in hot and dense matter

abstract:
  We present a study of the $\pi\pi$ scattering amplitude in the $\sigma$ and
$\rho$ channels at finite temperature and nuclear density within a chiral
unitary framework. Meson resonances are dynamically generated in our approach,
which allows us to analyze the behavior of their associated scattering poles
when the system is driven towards chiral symmetry restoration. Medium effects
are incorporated in three ways: (a) by thermal corrections of the unitarized
scattering amplitudes, (b) by finite nuclear density effects associated to a
renormalization of the pion decay constant, and complementarily (c) by
extending our calculation of the scalar-isoscalar channel to account for finite
nuclear density and temperature effects in a microscopic many-body
implementation of pion dynamics. Our results are discussed in connection with
several phenomenological aspects relevant for nuclear matter and Heavy-Ion
Collision experiments, such as $\rho$ mass scaling vs broadening from dilepton
spectra and chiral restoration signals in the $\sigma$ channel. We also
elaborate on the molecular nature of $\pi\pi$ resonances.


title:
Mode Change Protocol for Multi-Mode Real-Time Systems upon Identical
  Multiprocessors

abstract:
  In this paper, we propose a synchronous protocol without periodicity for
scheduling multi-mode real-time systems upon identical multiprocessor
platforms. Our proposal can be considered to be a multiprocessor extension of
the uniprocessor protocol called "Minimal Single Offset protocol".


title:
Screening of hydrodynamic interactions for polyelectrolytes in salt
  solution

abstract:
  We provide numerical evidence that hydrodynamic interactions are screened for
charged polymers in salt solution on time scales below the Zimm time. At very
short times, a crossover to hydrodynamic behavior is observed. Our conclusions
are drawn from extensive coarse-grained computer simulations of
polyelectrolytes in explicit solvent and explicit salt, and discussed in terms
of analytical arguments based on the Debye-Hueckel approximation.


title: New Results from the MINOS Experiment

abstract:
  In this paper we present the latest results from the MINOS Experiment. This
includes a new measurement of the atmospheric neutrino oscillation parameters
based on 3.36 x 10^20 protons-on-target of data and a first analysis of neutral
current events in the Far Detector. The prospects for nu-e appearance
measurements in MINOS are also discussed.


title:
Investigation of the magnetic fluctuations in Tb$_2$Sn$_2$O$_7$ ordered
  spin ice by high resolution energy-resolved neutron scattering

abstract:
  We have studied magnetically frustrated Tb$_2$Sn$_2$O$_7$ by neutron
diffraction and high resolution energy-resolved neutron scattering. At 0.1 K,
we observe short range magnetic correlations with a typical scale of 4 \AA,
close to the near neighbor distance between Tb$^{3+}$ ions. %(3.686 \AA), This
short range order coexists with ferromagnetic correlations and long range spin
ice order at the scales of 18 and 190 \AA, respectively. Spin dynamics was
investigated at a time scale down to 10$^{-9}$s, by energy-resolved experiments
on a backscattering spectrometer. We observe a freezing of the spin dynamics
for all length-scales, with a strong slowing down of the spin fluctuations when
long range order settles in. We discuss the spin fluctuations remaining in the
ground state in comparison with previous data obtained by muon spectroscopy.


title:
Large bandwidth, highly efficient optical gratings through high index
  materials

abstract:
  We analyze the diffraction characteristics of dielectric gratings that
feature a high index grating layer, and devise, through rigorous numerical
calculations, large bandwidth, highly efficient, high dispersion dielectric
gratings in reflection, transmission, and immersed transmission geometry. A
dielectric TIR grating is suggested, whose -1dB spectral bandwidth is doubled
as compared to its all-glass equivalent. The short wavelength diffraction
efficiency is additionally improved by allowing for slanted lamella. The
grating surpasses a blazed gold grating over the full octave. An immersed
transmission grating is devised, whose -1dB bandwidth is tripled as compared to
its all-glass equivalent, and that surpasses an equivalent classical
transmission grating over nearly the full octave. A transmission grating in the
classical scattering geometry is suggested, that features a buried high index
layer. This grating provides effectively 100% diffraction efficiency at its
design wavelegth, and surpasses an equivalent fused silica grating over the
full octave.


title:
Thermostatistics of a single particle on a granular dimer lattice:
  influence of defects

abstract:
  We study the thermostatistical fluctuations of a single Delrin monomer on a
granular lattice of dimer particles using both experiment and simulation. The
goal is to examine the collision frequency, energy injection, and sidewall
effects on a single second-layer particle in a bi-layer granular gas
experiment. Non-Gaussian velocity statistics are observed for the single
particle of the top layer and result from the presence of defects in the first
layer. These deviations are not directly due to the presence of the boundary
wall, since the form of velocity distributions is quite spatially homogeneous,
but are the consequence of the presence of a few mobile defects in the first
layer.