title:
Measurement of Deeply Virtual Compton Scattering and its t-dependence at
  HERA

abstract:
  A measurement of elastic deeply virtual Compton scattering gamma* p -> gamma
p using e-p collision data recorded with the H1 detector at HERA is presented.
The analysed data sample corresponds to an integrated luminosity of 145 pb^-1.
The cross section is measured as a function of the virtuality Q^2 of the
exchanged photon and the centre-of-mass energy W of the gamma*p system in the
kinematic domain 6.5 < Q^2 < 80 GeV^2, 30 < W < 140 GeV and |t| < 1 GeV^2,
where t denotes the squared momentum transfer at the proton vertex. The cross
section is determined differentially in t for different Q^2 and W values and
exponential t-slope parameters are derived. The measurements are compared to a
NLO QCD calculation based on generalised parton distributions. In the context
of the dipole approach, the geometric scaling property of the DVCS cross
section is studied for different values of t.


title:
Singlet ground state probed by crystal field inelastic neutron
  spectroscopy on the antiferroquadrupolar system TmGa_{3}

abstract:
  TmGa$_{3}$ (AuCu$_3$ structure) undergoes two phase transitions, an
antiferroquadrupolar transition at $\sim$ 4.29 K and long-range
antiferromagnetic ordering at $\sim$ 4.26 K. Due to the close vicinity of the
two phase transitions, TmGa$_3$ offers an interesting system to study the
interplay of charge and magnetic degrees of freedom. In order to understand
this interplay we have performed inelastic neutron scattering experiments on
TmGa$_{3}$ in the paramagnetic regime ($T >$ 5 K) to redetermine the crystal
electric field level scheme. By fitting our spectra at various temperatures we
obtain a new crystal field level scheme with Lea, Leask and Wolf parameters of
$x_{\rm LLW}$ = -0.44(2) and $W$ = -0.222(2) K. The total crystal field
splitting at 5K amounts to $\sim$ 2.3 meV, about an order of magnitude less
than found previously, but in good agreement with the splitting extrapolated
from the related ErGa$_3$ system.
  Our analysis yields a $\Gamma_{2}$ singlet as the crystal field ground state
followed closely by a (nonmagnetic) $\Gamma_{1}$ singlet at 0.009 meV. The next
excited states are a $\Gamma_{5}^{(2)}$ triplet at $\sim$0.5 meV, which is
almost degenerate to a $\Gamma_{4}$ doublet. This level scheme is adverse to
previous findings. Subsequent analysis of the magnetisation along several
crystallographic directions and the temperature dependant susceptibility as
well as of the magnetic contribution to the specific heat are consistent with
our new crystal field parameters. Implications for the antiferroquadrupolar and
the antiferromagnetic transition are discussed.


title: A universality theorem for Voevodsky's algebraic cobordism spectrum

abstract:
  An algebraic version of a theorem due to Quillen is proved. More precisely,
for a ground field k we consider the motivic stable homotopy category SH(k) of
P^1-spectra equipped with the symmetric monoidal structure described in
arXiv:0709.3905v1 [math.AG]. The algebraic cobordism P^1-spectrum MGL is
considered as a commutative monoid equipped with a canonical orientation. For a
commutative monoid E in the category SH(k) we identify the set of monoid
homomorphisms from MGL to E in the motivic stable homotopy category with the
set of all orientations of E. This result was stated originally in a slightly
different form by G. Vezzosi in arXiv:math/0004050v2 [math.AG].


title:
Deciding Unambiguity and Sequentiality starting from a Finitely
  Ambiguous Max-Plus Automaton

abstract:
  Finite automata with weights in the max-plus semiring are considered. The
main result is: it is decidable in an effective way whether a series that is
recognized by a finitely ambiguous max-plus automaton is unambiguous, or is
sequential. A collection of examples is given to illustrate the hierarchy of
max-plus series with respect to ambiguity.


title: An efficient simulation algorithm based on abstract interpretation

abstract:
  A number of algorithms for computing the simulation preorder are available.
Let Sigma denote the state space, -> the transition relation and Psim the
partition of Sigma induced by simulation equivalence. The algorithms by
Henzinger, Henzinger, Kopke and by Bloom and Paige run in O(|Sigma||->|)-time
and, as far as time-complexity is concerned, they are the best available
algorithms. However, these algorithms have the drawback of a space complexity
that is more than quadratic in the size of the state space. The algorithm by
Gentilini, Piazza, Policriti--subsequently corrected by van Glabbeek and
Ploeger--appears to provide the best compromise between time and space
complexity. Gentilini et al.'s algorithm runs in O(|Psim|^2|->|)-time while the
space complexity is in O(|Psim|^2 + |Sigma|log|Psim|). We present here a new
efficient simulation algorithm that is obtained as a modification of Henzinger
et al.'s algorithm and whose correctness is based on some techniques used in
applications of abstract interpretation to model checking. Our algorithm runs
in O(|Psim||->|)-time and O(|Psim||Sigma|log|Sigma|)-space. Thus, this
algorithm improves the best known time bound while retaining an acceptable
space complexity that is in general less than quadratic in the size of the
state space. An experimental evaluation showed good comparative results with
respect to Henzinger, Henzinger and Kopke's algorithm.


title:
Idempotent and tropical mathematics and problems of mathematical physics
  (Volume II)

abstract:
  This volume contains the proceedings of an International Workshop on
Idempotent and Tropical Mathematics and Problems of Mathematical Physics, held
at the Independent University of Moscow, Russia, on August 25-30, 2007.

categories: math.RA math-ph math.AG math.AP math.MP math.OA math.OC math.RT


title: Superfrustration of charge degrees of freedom

abstract:
  We review recent results, obtained with P. Fendley, on frustration of quantum
charges in lattice models for itinerant fermions with strong repulsive
interactions. A judicious tuning of kinetic and interaction terms leads to
models possessing supersymmetry. In such models frustration takes the form of
what we call superfrustration: an extensive degeneracy of supersymmetric ground
states. We present a gallery of examples of superfrustration on a variety of 2D
lattices.


title: Ginzburg-Landau theory of noncentrosymmetric superconductors

abstract:
  The data of temperature dependent superfluid density $n_s(T)$ in
Li$_2$Pd$_3$B and Li$_2$Pt$_3$B [Yuan {\it et al.}, \phrl97, 017006 (2006)]
show that a sudden change of the slope of $n_s (T)$ occur at slightly lower
than the critical temperature. Motivated by this observation, we
microscopically derive the Ginzburg-Landau (GL) equations for
noncentrosymmetric superconductors with Rashba type spin orbit interaction.
Cooper pairing is assumed to occur between electrons only in the same spin
split band and pair scattering is allowed to occur between two spin split
bands. The GL theory of such a system predicts two transition temperatures, the
higher of which is the conventional critical temperature $T_c$ while the lower
one $T^*$ corresponds to the cross-over from a mixed singlet-triplet phase at
lower temperatures to only spin-singlet or spin-triplet (depending on the sign
of the interband scattering potential) phase at higher temperatures. As a
consequence, $n_s (T)$ shows a kink at this cross-over temperature. We
attribute the temperature at which sudden change of slope occurs in the
observed $n_s (T)$ to the temperature $T^*$. This may also be associated with
the observed kink in the penetration depth data of CePt$_3$Si. We have also
estimated critical field near critical temperature.


title: Symmetries in projective multiresolution analyses

abstract:
  We give an equivariant version of Packer and Rieffel's theorem on sufficient
conditions for the existence of orthonormal wavelets in projective
multiresolution analyses. The scaling functions that generate a projective
multiresolution analysis are supposed to be invariant with respect to some
finite group action. We give sufficient conditions for the existence of
wavelets with similar invariance.


title: Statistics of the polariton condensate

abstract:
  The influence of polariton-polariton scattering on the statistics of the
polariton condensate in a non-resonantly excited semiconductor quantum well
embedded in a CdTe semiconductor microcavity is discussed. Taking advantage of
the existence of a bottleneck in the polariton dispersion curve, the polariton
states are separated into two domains: reservoir polaritons inside the
bottleneck and active polaritons with wave vector q whose energy lies below the
bottleneck. In the framework of the master equation formalism, the
non-equilibrium stationary reduced density matrix is calculated and the
statistics of polaritons in the condensate at q=0 is determined. The anomalous
correlations between the polaritons in the condensate and those with wave
vectors q, -q leads to an enhancement of the noise in the condensate. As a
consequence, the second order correlation function of the condensate does not
show the full coherence that is characteristic of laser emission.


title: On the relation of Voevodsky's algebraic cobordism to Quillen's K-theory

abstract:
  Quillen's algebraic K-theory is reconstructed via Voevodsky's algebraic
cobordism. More precisely, for a ground field k the algebraic cobordism
P^1-spectrum MGL of Voevodsky is considered as a commutative P^1-ring spectrum.
There is a unique ring morphism MGL^{2*,*}(k)--> Z which sends the class
[X]_{MGL} of a smooth projective k-variety X to the Euler characteristic of the
structure sheaf of X. Our main result states that there is a canonical grade
preserving isomorphism of ring cohomology theories MGL^{*,*}(X,U)
\tensor_{MGL^{2*,*}(k)} Z --> K^{TT}_{- *}(X,U) = K'_{- *}(X-U)} on the
category of smooth k-varieties, where K^{TT}_* is Thomason-Trobaugh K-theory
and K'_* is Quillen's K'-theory. In particular, the left hand side is a ring
cohomology theory. Moreover both theories are oriented and the isomorphism
above respects the orientations. The result is an algebraic version of a
theorem due to Conner and Floyd. That theorem reconstructs complex K-theory via
complex cobordism.


title: Work extremum principle: Structure and function of quantum heat engines

abstract:
  We consider a class of quantum heat engines consisting of two subsystems
interacting via a unitary transformation and coupled to two separate baths at
different temperatures $T_h > T_c$. The purpose of the engine is to extract
work due to the temperature difference. Its dynamics is not restricted to the
near equilibrium regime. The engine structure is determined by maximizing the
extracted work under various constraints. When this maximization is carried out
at finite power, the engine dynamics is described by well-defined temperatures
and satisfies the local version of the second law. In addition, its efficiency
is bounded from below by the Curzon-Ahlborn value $1-\sqrt{T_c/T_h}$ and from
above by the Carnot value $1-(T_c/T_h)$. The latter is reached|at finite
power|for a macroscopic engine, while the former is achieved in the equilibrium
limit $T_h\to T_c$. When the work is maximized at a zero power, even a small
(few-level) engine extracts work right at the Carnot efficiency.


title: Anomalous Quantum Hall Effect on Sphere

abstract:
  We study the anomalous quantum Hall effect exhibited by the relativistic
particles living on two-sphere S^2 and submitted to a magnetic monopole. We
start by establishing a direct connection between the Dirac and Landau
operators through the Pauli--Schr\"odinger Hamiltonian H_{s}^{SP}. This will be
helpful in the sense that the Dirac eigenvalues and eigenfunctions will be
easily derived. In analyzing H_{s}^{SP} spectrum, we show that there is a
composite fermion nature supported by the presence of two effective magnetic
fields. For the lowest Landau level, we argue that the basic physics of
graphene is similar to that of two-dimensional electron gas, which is in
agreement with the planar limit. For the higher Landau levels, we propose a
SU(N) wavefunction for different filling factors that captures all symmetries.
Focusing on the graphene case, i.e. N=4, we give different configurations those
allowed to recover some known results.

categories: hep-th cond-mat.mes-hall math-ph math.MP


title: Global Square and Mutual Stationarity at the Aleph_n

abstract:
  We show using a proof of the Global Square property in Core Models below a
measurable of Mitchell order o(kappa)=kappa^++ (a result originally due to
Jensen & Zeman) that Foreman and Magidor's Mutual Stationarity property
MS(Aleph_n (1<n<omega), Cof(omega_1)) implies the existence of inner models
with measurables of high Mitchell order. This MS property states that any
sequence of independently chosen stationary subsets S_n of the Aleph_n (of
fixed cofinality omega_1) is mutually stationary below aleph_omega.


title:
Symmetry in Full Counting Statistics, Fluctuation Theorem, and Relations
  among Nonlinear Transport Coefficients in the Presence of a Magnetic Field

abstract:
  We study full counting statistics of coherent electron transport through
multi-terminal interacting quantum-dots under a finite magnetic field.
Microscopic reversibility leads to the symmetry of the cumulant generating
function, which generalizes the fluctuation theorem in the context of quantum
transport. Using this symmetry, we derive the Onsager-Casimir relation in the
linear transport regime and universal relations among nonlinear transport
coefficients.


title:
Off-line studies of the laser ionization of yttrium at the IGISOL
  facility

abstract:
  A laser ion source is under development at the IGISOL facility, Jyvaskyla, in
order to address deficiencies in the ion guide technique. The key elements of
interest are those of a refractory nature, whose isotopes and isomers are
widely studied using both laser spectroscopic and high precision mass
measurement techniques. Yttrium has been the first element of choice for the
new laser ion source. In this work we present a new coupled dye-Ti:Sapphire
laser scheme and give a detailed discussion of the results obtained from laser
ionization of yttrium atoms produced in an ion guide via joule heating of a
filament. The importance of not only gas purity, but indeed the baseline vacuum
pressure in the environment outside the ion guide is discussed in light of the
fast gas phase chemistry seen in the yttrium system. A single laser shot model
is introduced and is compared to the experimental data in order to extract the
level of impurities within the gas cell.


title: Dynamical simulations with HYP-link Wilson fermions

abstract:
  We present results from simulations of two dynamical flavors of improved
Wilson fermions with nHYP smeared gauge links. We demonstrate that the
simulation is stable at a pseudo-scalar mass of 360MeV, a 2.1fm box and a
lattice spacing of 0.13fm.


title: Microscopic non-equilibrium theory of quantum well solar cells

abstract:
  We present a microscopic theory of bipolar quantum well structures in the
photovoltaic regime, based on the non-equilibrium Green's function formalism
for a multi band tight binding Hamiltonian. The quantum kinetic equations for
the single particle Green's functions of electrons and holes are
self-consistently coupled to Poisson's equation, including inter-carrier
scattering on the Hartree level. Relaxation and broadening mechanisms are
considered by the inclusion of acoustic and optical electron-phonon interaction
in a self consistent Born approximation of the scattering self energies.
Photogeneration of carriers is described on the same level in terms of a self
energy derived from the standard dipole approximation of the electron-photon
interaction. Results from a simple two band model are shown for the local
density of states, spectral response, current spectrum, and current-voltage
characteristics for generic single quantum well systems.


title: A tool for phase resolved spectroscopy with ISGRI

abstract:
  INTEGRAL observations provide a large amount of data on accreting binary
systems. The interpretation of the spectral emission of these sources needs
timing analysis and phase resolved spectroscopy, which are really cumbersome
tasks if performed with tools based on the imaging extraction methods usually
used for coded mask instruments. Here we present a software for the ISGRI
instrument which allows to extract in a fast way, light curves, pulse profiles,
and phase resolved spectra, making data reduction a much easier task.


title:
Distances sets that are a shift of the integers and Fourier basis for
  planar convex sets

abstract:
  The aim of this paper is to prove that if a planar set $A$ has a difference
set $\Delta(A)$ satisfying $\Delta(A)\subset \Z^++s$ for suitable $s$ than $A$
has at most 3 elements. This result is motivated by the conjecture that the
disk has not more than 3 orthogonal exponentials. Further, we prove that if $A$
is a set of exponentials mutually orthogonal with respect to any symmetric
convex set $K$ in the plane with a smooth boundary and everywhere non-vanishing
curvature, then $ # (A \cap {[-q,q]}^2) \leq C(K) q$ where $C(K)$ is a constant
depending only on $K$. This extends and clarifies in the plane the result of
Iosevich and Rudnev. As a corollary, we obtain the result from \cite{IKP01} and
\cite{IKT01} that if $K$ is a centrally symmetric convex body with a smooth
boundary and non-vanishing curvature, then $L^2(K)$ does not possess an
orthogonal basis of exponentials.


title: Alpha-alpha interaction with chiral two pion exchange and 8Be lifetime

abstract:
  Assuming that alpha particles are described by a scalar-isoscalar chiral
invariant heavy field it is shown how chiral symmetry determines the
alpha-alpha interaction at long distances unambiguously from dimensional power
counting of an effective chiral Lagrangean. The leading strong contribution is
given by a two pion exchange potential which turns out to be attractive and
singular at the origin, hence demanding renormalization. When 8Be is treated as
a resonance state a model independent correlation between the Q-factor and
lifetime 1/Gamma for the decay into two alpha particles arises. For parameters
compatible with potential model analyses of low energy pi-alpha scattering it
is found a Breit-Wigner width Gamma = 4.3(3) eV very close to the experimental
value, Gamma= 5.57 (25)eV.


title:
Effect of matrix parameters on mesoporous matrix based quantum
  computation

abstract:
  We present a solid state implementation of quantum computation, which
improves previously proposed optically driven schemes. Our proposal is based on
vertical arrays of quantum dots embedded in a mesoporous material which can be
fabricated with present technology. We study the feasibility of performing
quantum computation with different mesoporous matrices. We analyse which matrix
materials ensure that each individual stack of quantum dots can be considered
isolated from the rest of the ensemble-a key requirement of our scheme. This
requirement is satisfied for all matrix materials for feasible structure
parameters and GaN/AlN based quantum dots. We also show that one dimensional
ensembles substantially improve performances, even of CdSe/CdS based quantum
dots.


title:
X-ray Emission from Planetary Nebulae and their Central Stars: a Status
  Report

abstract:
  In the era of Chandra and XMM-Newton, the detection (or nondetection) of
diffuse and/or point-like X-ray sources within planetary nebulae (PNe) yields
important, unique insight into PN shaping processes. Diffuse X-ray sources,
whether due to ``hot bubbles'' or to collimated outflows or jets, allow us to
probe the energetic shocks within PN wind interaction regions. Meanwhile, X-ray
point sources provide potential diagnostics of magnetic fields, accretion
disks, and/or binary companions at PN cores. Here, I highlight recent X-ray
observational results and trends that have the potential to shed new light on
the origin and evolution of the structure of PNe.


title:
The relativistic velocity addition law optimizes a forecast gambler's
  profit

abstract:
  We extend the projective covariant bookmaker's bets model to the forecasting
gamblers case. The probability of correctness of forecasts shifts probabilities
of branching. The formula for the shift of probabilities leads to the velocity
addition rule of the special theory of relativity. In the absence of
information about bookmaker's wagers the stochastic logarithmic rates
completely determines the optimal stakes of forecast gambler.


title:
How do the grains slide in fine-grained zirconia polycrystals at high
  temperature?

abstract:
  Degradation of mechanical properties of zirconia polycrystals is hardly
discussed in terms of solution-precipitation grain-boundary sliding due to
experimental controversies over imaging of intergranular amorphous phases at
high and room temperatures. Here, the authors applied the techniques of
mechanical spectroscopy and transmission electron microscopy (TEM) to shed
light on the amorphization of grain interfaces at high temperature where the
interface-reaction determines the behaviour of fine-grained zirconia
polycrystals. They present mechanical spectroscopy results, which yield
evidences of an intergranular amorphous phase in silica doped and high-purity
zirconia at high temperature. Quenching of zirconia polycrystals reveals an
intergranular amorphous phase on TEM images at room temperature.


title:
Serendipitous Chandra X-ray Detection of a Hot Bubble within the
  Planetary Nebula NGC 5315

abstract:
  We report the serendipitous detection of the planetary nebula NGC 5315 by the
Chandra X-ray Observatory. The Chandra imaging spectroscopy results indicate
that the X-rays from this PN, which harbors a Wolf-Rayet (WR) central star,
emanate from a T_X ~ 2.5x10^6 K plasma generated via the same wind-wind
collisions that have cleared a compact (~8000 AU radius) central cavity within
the nebula. The inferred X-ray luminosity of NGC 5315 is ~2.5x10^{32} erg
s^{-1} (0.3-2.0 keV), placing this object among the most luminous such ``hot
bubble'' X-ray sources yet detected within PNe. With the X-ray detection of NGC
5315, objects with WR-type central stars now constitute a clear majority of
known examples of diffuse X-ray sources among PNe; all such ``hot bubble'' PN
X-ray sources display well-defined, quasi-continuous optical rims. We therefore
assert that X-ray-luminous hot bubbles are characteristic of young PNe with
large central star wind kinetic energies and closed bubble morphologies.
However, the evidence at hand also suggests that processes such as wind and
bubble temporal evolution, as well as heat conduction and/or mixing of hot
bubble and nebular gas, ultimately govern the luminosity and temperature of
superheated plasma within PNe.


title: Fr\"ohlich Polarons from 0D to 3D: Concepts and Recent Developments

abstract:
  I analyse our present understanding of the Froehlich polaron with emphasis on
the response properties, in particular optical absorption.


title: On representation theory of affine Hecke algebras of type B

abstract:
  Ariki's and Grojnowski's approach to the representation theory of affine
Hecke algebras of type $A$ is applied to type $B$ with unequal parameters to
obtain -- under certain restrictions on the eigenvalues of the lattice
operators -- analogous multiplicity-one results and a classification of
irreducibles with partial branching rules as in type $A$.


title:
Colloids dragged through a polymer solution: experiment, theory and
  simulation

abstract:
  We present micro-rheological measurments of the drag force on colloids pulled
through a solution of lambda-DNA (used here as a monodisperse model polymer)
with an optical tweezer. The experiments show a violation of the
Stokes-Einstein relation based on the independently measured viscosity of the
DNA solution: the drag force is larger than expected. We attribute this to the
accumulation of DNA infront of the colloid and the reduced DNA density behind
the colloid. This hypothesis is corroborated by a simple drift-diffusion model
for the DNA molecules, which reproduces the experimental data surprisingly
well, as well as by corresponding Brownian dynamics simulations.


title: A weighted network evolution model based on passenger behavior

abstract:
  This paper presents an evolution model of weighted networks in which the
structural growth and weight dynamics are driven by human behavior, i.e.
passenger route choice behavior. Transportation networks grow due to people's
increasing travel demand and the pattern of growth is determined by their route
choice behavior. In airline networks passengers often transfer from a third
airport instead of flying directly to the destination, which contributes to the
hubs formation and finally the scale-free statistical property. In this model
we assume at each time step there emerges a new node with m travel
destinations. Then the new node either connects destination directly with the
probability p or transfers from a third node with the probability 1-p. The
analytical result shows degree and strength both obey power-law distribution
with the exponent between 2.33 and 3 depending on p. The weights also obey
power-law distribution. The clustering coefficient, degree assortatively
coefficient and degree-strength correlation are all dependent on the
probability p. This model can also be used in social networks.


title: Single crystal growth and anisotropy of CeRuPO

abstract:
  We report on the single crystal growth of the ferromagnetic Kondo lattice
system CeRuPO using a Sn flux method. Magnetic susceptibility and electrical
resistivity measurements indicate strong anisotropy of this structurally
layered compound. They evidence that the magnetic moments order
ferromagnetically along the c-direction of the tetragonal unit cell, whereas
the crystal electric field (CEF) anisotropy favors the ab-plane. Therefore,
CeRuPO presents the unusual case within rare earth systems, where the
anisotropy of the interionic exchange interaction overcomes the single ion
anisotropy due to the CEF interaction.


title: Stanley decompositions of squarefree modules and Alexander duality

abstract:
  In this paper we study how prime filtrations and squarefree Stanley
decompositions of squarefree modules over the polynomial ring and the exterior
algebra behave with respect to Alexander duality.


title: Signatures of non-monotonic d-wave gap in electron-doped cuprates

abstract:
  We address the issue whether the data on optical conductivity and Raman
scattering in electron-doped cuprates below $T_c$ support the idea that the
$d-$wave gap in these materials is non-monotonic along the Fermi surface. We
calculate the conductivity and Raman intensity for elastic scattering, and find
that a non-monotonic gap gives rise to several specific features in optical and
Raman response functions. We argue that all these features are present in the
experimental data on Nd$_{2-x}$Ce$_{x}$CuO$_4$ and Pr$_{2-x}$Ce$_{x}$CuO$_4$
compounds.


title: Uniqueness of solutions of stochastic differential equations

abstract:
  We consider a d-dimensional stochastic differential equation with additive
noise and a drift coefficient which is assumed only to be a bounded Borel
function. We show that, for almost all choices of the driving Brownian path,
the equation has a unique solution.


title:
Quasiclassical generalized Weierstrass representation and dispersionless
  DS equation

abstract:
  Quasiclassical generalized Weierstrass representation (GWR) for highly
corrugated surfaces with slow modulation in the four-dimensional Euclidean
space is proposed. Integrable deformations of such surfaces are described by
the dispersionless Davey-Stewartson hierarchy. Quasiclassical GWRs for other
four-dimensional spaces and dispersionless DS system are discussed too.


title: Wrapped Magnetized Branes: Two Alternative Descriptions?

abstract:
  We discuss two inequivalent ways for describing magnetized D-branes wrapped N
times on a torus T^2. The first one is based on a non-abelian gauge bundle
U(N), while the second one is obtained by means of a Narain T-duality
transformation acting on a theory with non-magnetized branes. We construct in
both descriptions the boundary state and the open string vertices and show that
they give rise to different string amplitudes. In particular, the description
based on the gauge bundle has open string vertex operators with momentum
dependent Chan-Paton factors.


title: Generic behaviours in impact fragmentation

abstract:
  We present a simple numerical model for investigating the general properties
of fragmentation. By use of molecular dynamics simulations, we study the impact
fragmentation of a solid disk of interacting particles with a wall. Regardless
of the particular form of the interaction potential, the fragment size
distribution exhibits a power law behaviour with an exponent that increases
logarithmically with the energy deposited in the system, in agreement with
experiments. We expect this behaviour to be generic in fragmentation phenomena.


title:
Universal description of the rotational-vibrational spectrum of three
  particles with zero-range interactions

abstract:
  A comprehensive universal description of the rotational-vibrational spectrum
for two identical particles of mass $m$ and the third particle of the mass
$m_1$ in the zero-range limit of the interaction between different particles is
given for arbitrary values of the mass ratio $m/m_1$ and the total angular
momentum $L$. If the two-body scattering length is positive, a number of
vibrational states is finite for $L_c(m/m_1) \le L \le L_b(m/m_1)$, zero for
$L>L_b(m/m_1)$, and infinite for $L<L_c(m/m_1)$. If the two-body scattering
length is negative, a number of states is either zero for $L \ge L_c(m/m_1)$ or
infinite for $L<L_c(m/m_1)$. For a finite number of vibrational states, all the
binding energies are described by the universal function $\epsilon_{LN}(m/m_1)
= {\cal E}(\xi, \eta)$, where $\xi=\displaystyle\frac{N-1/2}{\sqrt{L(L + 1)}}$,
$\eta=\displaystyle\sqrt{\frac{m}{m_1 L (L + 1)}}$,and $N$ is the vibrational
quantum number. This scaling dependence is in agreement with the numerical
calculations for $L > 2$ and only slightly deviates from those for $L = 1, 2$.
The universal description implies that the critical values $L_c(m/m_1)$ and
$L_b(m/m_1)$ increase as $0.401 \sqrt{m/m_1}$ and $0.563 \sqrt{m/m_1}$,
respectively, while a number of vibrational states for $L \ge L_c(m/m_1)$ is
within the range $N \le N_{max} \approx 1.1 \sqrt{L(L+1)}+1/2$.


title: Cosmological implications of the KATRIN experiment

abstract:
  The upcoming Karlsruhe Tritium Neutrino (KATRIN) experiment will put
unprecedented constraints on the absolute mass of the electron neutrino,
$\mnue$. In this paper we investigate how this information on $\mnue$ will
affect our constraints on cosmological parameters. We consider two scenarios;
one where $\mnue=0$ (i.e., no detection by KATRIN), and one where
$\mnue=0.3$eV. We find that the constraints on $\mnue$ from KATRIN will affect
estimates of some important cosmological parameters significantly. For example,
the significance of $n_s<1$ and the inferred value of $\Omega_\Lambda$ depend
on the results from the KATRIN experiment.


title: Finite Element Formalism for Micromagnetism

abstract:
  The aim of this work is to present the details of the finite element approach
we developed for solving the Landau-Lifschitz-Gilbert equations in order to be
able to treat problems involving complex geometries. There are several
possibilities to solve the complex Landau-Lifschitz-Gilbert equations
numerically. Our method is based on a Galerkin-type finite element approach. We
start with the dynamic Landau-Lifschitz-Gilbert equations, the associated
boundary condition and the constraint on the magnetization norm. We derive the
weak form required by the finite element method. This weak form is afterwards
integrated on the domain of calculus. We compared the results obtained with our
finite element approach with the ones obtained by a finite difference method.
The results being in very good agreement, we can state that our approach is
well adapted for 2D micromagnetic systems.


title:
Lower bounds on the canonical height associated to the morphism \phi(z)=
  z^d+c

abstract:
  Certain lower bounds are obtained on the canonical height associated to the
morphism $\phi(z)=z^d+c$.


title:
Photonuclear reactions of actinide and pre-actinide nuclei at
  intermediate energies

abstract:
  Photonuclear reaction is described with an approach based on the
quasideuteron nuclear photoabsorption model followed by the process of
competition between light particle evaporation and fission for the excited
nucleus. Thus fission process is considered as a decay mode. The
evaporation-fission process of the compound nucleus is simulated in a
Monte-Carlo framework. Photofission reaction cross sections are analysed in a
systematic manner in the energy range $\sim$~50-70 MeV for the actinides
$^{232}$Th, $^{233}$U, $^{235}$U, $^{238}$U and $^{237}$Np and the pre-actinide
nuclei $^{208}$Pb and $^{209}$Bi. The study reproduces satisfactorily well the
available experimental data of photofission cross sections at energies
$\sim$~50-70 MeV and the increasing trend of nuclear fissility with the
fissility parameter $Z^2/A$ for the actinides and pre-actinides at intermediate
energies [$\sim$~20-140 MeV].


title: Raman imaging of doping domains in graphene on SiO2

abstract:
  We present spatially resolved Raman images of the G and 2D lines of
single-layer graphene flakes. The spatial fluctuations of G and 2D lines are
correlated and are thus shown to be affiliated with local doping domains. We
investigate the position of the 2D line -- the most significant Raman peak to
identify single-layer graphene -- as a function of charging up to |n|~4 10^12
cm^-2. Contrary to the G line which exhibits a strong and symmetric stiffening
with respect to electron and hole-doping, the 2D line shows a weak and slightly
asymmetric stiffening for low doping. Additionally, the line width of the 2D
line is, in contrast to the G line, doping-independent making this quantity a
reliable measure for identifying single-layer graphene.


title:
A combinatorial and field theoretic path to quantum gravity: the new
  challenges of group field theory

abstract:
  Group field theories are a new type of field theories over group manifolds
and a generalization of matrix models, that have recently attracted much
interest in quantum gravity research. They represent a development of and a
possible link between different approaches such as loop quantum gravity and
simplicial quantum gravity. After a brief introduction to the GFT formalism we
put forward a long but still far from exhaustive list of open issues that this
line of research faces, and that could be represent interesting challenges for
mathematicians and mathematical physicists alike.


title: Infrared spectroscopic diagnostics for Active Galactic Nuclei

abstract:
  Infrared spectroscopy in the mid- and far-infrared provides powerful
diagnostics for studying the emission regions in active galaxies. The large
variety of ionic fine structure lines can probe gas conditions in a variety of
physical conditions, from highly ionized gas excited by photons originated by
black hole accretion to gas photoionized by young stellar systems. The critical
density and the ionization potential of these transitions allow to fully cover
the density-ionization parameter space. Some examples of line ratios diagrams
using both mid-infrared and far-infrared ionic fine structure lines are
presented. The upcoming space observatory Herschel will be able to observe the
far-infrared spectra of large samples of local active galaxies. Based on the
observed near-to-far infrared emission line spectrum of the template galaxy
NGC1068, are presented the predictions for the line fluxes expected for
galaxies at high redshift. To observe spectroscopically large samples of
distant galaxies, we will have to wait fot the future space missions, like
SPICA and, ultimately, FIRI.


title:
Torques on Spheroidal Silicate Grains Exposed to Anisotropic
  Interstellar Radiation Fields

abstract:
  Radiative torques, due to the absorption and scattering of starlight, are
thought to play a major role in the alignment of grains with the interstellar
magnetic field. The absorption of radiation also gives rise to recoil torques,
associated with the photoelectric effect and photodesorption. The recoil
torques are much more difficult to model and compute than the direct radiative
torque. Here, we consider the relatively simple case of a spheroidal grain.
Given our best estimates for the photoelectric yield and other relevant grain
physical properties, we find that the recoil torques contribute at the 10%
level or less compared with the direct radiative torque. We recommend that the
recoil torques not be included in models of radiation-driven grain alignment at
this time. However, additional experimental characterization of the surface
properties and photoelectric yield for sub-micron grains is needed to better
quantify the magnitude of these torques.


title:
Origin of the abundance patterns in Galactic globular clusters:
  constraints on dynamical and chemical properties of globular clusters

abstract:
  Aims. We analyse the effects of a first generation of fast rotating massive
stars on the dynamical and chemical properties of globular clusters. Methods.
We use stellar models of fast rotating massive stars, losing mass through a
slow mechanical equatorial winds to produce material rich in H-burning
products. We propose that stars with high Na and low O abundances (hereafter
anomalous stars) are formed from matter made of slow winds of individual
massive stars and of interstellar matter. The proportion of slow wind and of
interstellar material is fixed in order to reproduce the observed Li-Na
anticorrelation in NGC 6752. Results. In the case that globular clusters,
during their lifetime, did not lose any stars, we found that to reproduce the
observed ratio of normal to anomalous stars, a flat initial mass function (IMF)
is needed, with typically a slope x=0.55 (a Salpeter's IMF has x=1.35). In the
case that globular clusters suffer from an evaporation of normal stars, the IMF
slope can be steeper: to have x=1.35, about 96% of the normal stars would be
lost. We make predictions for the distribution of stars as a function of their
[O/Na] and obtain quite reasonable agreement with that one observed for NGC
6752. Predictions for the number fraction of stars with different values of
helium, of the 12C/13C and 16O/17O ratios are discussed, as well as the
expected relations between values of [O/Na] and those of helium, of [C/N], of
12C/13C and of 16O/17O. Future observations might test these predictions. We
also provide predictions for the present day mass of the clusters expressed in
units of mass of the gas used to form stars, and for the way the present day
mass is distributed between the first and second generation of stars and the
stellar remnants.


title: Galactic Rotation Parameters from Data on Open Star Clusters

abstract:
  Currently available data on the field of velocities Vr, Vl, Vb for open star
clusters are used to perform a kinematic analysis of various samples that
differ by heliocentric distance, age, and membership in individual structures
(the Orion, Carina--Sagittarius, and Perseus arms). Based on 375 clusters
located within 5 kpc of the Sun with ages up to 1 Gyr, we have determined the
Galactic rotation parameters
  Wo =-26.0+-0.3 km/s/kpc,
  W'o = 4.18+-0.17 km/s/kpc^2,
  W''o=-0.45+-0.06 km/s/kpc^3, the system contraction parameter K = -2.4+-0.1
km/s/kpc, and the parameters of the kinematic center Ro =7.4+-0.3 kpc and lo =
0+-1 degrees. The Galactocentric distance Ro in the model used has been found
to depend significantly on the sample age. Thus, for example, it is 9.5+-0.7
kpc and 5.6+-0.3 kpc for the samples of young (<50 Myr) and old (>50 Myr)
clusters, respectively. Our study of the kinematics of young open star clusters
in various spiral arms has shown that the kinematic parameters are similar to
the parameters obtained from the entire sample for the Carina-Sagittarius and
Perseus arms and differ significantly from them for the Orion arm. The
contraction effect is shown to be typical of star clusters with various ages.
It is most pronounced for clusters with a mean age of 100 Myr, with the
contraction velocity being Kr = -4.3+-1.0 km/s.


title:
Benchmark density functional theory calculations for nano-scale
  conductance

abstract:
  We present a set of benchmark calculations for the Kohn-Sham elastic
transmission function of five representative single-molecule junctions. The
transmission functions are calculated using two different density functional
theory (DFT) methods, namely an ultrasoft pseudopotential plane wave code in
combination with maximally localized Wannier functions, and the norm-conserving
pseudopotential code Siesta which applies an atomic orbital basis set. For all
systems we find that the Siesta transmission functions converge toward the
plane-wave result as the Siesta basis is enlarged. Overall, we find that an
atomic basis with double-zeta and polarization is sufficient (and in some cases
even necessary) to ensure quantitative agreement with the plane-wave
calculation. We observe a systematic down shift of the Siesta transmission
functions relative to the plane-wave results. The effect diminishes as the
atomic orbital basis is enlarged, however, the convergence can be rather slow.


title: On statistical mechanics in noncommutative spaces

abstract:
  We study the formulation of quantum statistical mechanics in noncommutative
spaces. We construct microcanonical and canonical ensemble theory in
noncommutative spaces. We consider for illustration some basic and important
examples in the framework of noncommutative statistical mechanics : (i). An
electron in a magnetic field. (ii). A free particle in a box. (iii). A linear
harmonic oscillator.


title: Compound-specific isotope analysis

abstract:
  The isotopic composition, for example, 14C/12C, 13C/12C, 2H/1H, 15N/14N and
18O/16O, of the elements of matter is heterogeneous. It is ruled by physical,
chemical and biological mechanisms. Isotopes can be employed to follow the fate
of mineral and organic compounds during biogeochemical transformations. The
determination of the isotopic composition of organic substances occurring at
trace level in very complex mixtures such as sediments, soils and blood, has
been made possible during the last 20 years due to the rapid development of
molecular level isotopic techniques. After a brief glance at pioneering studies
revealing isotopic breakthroughs at the molecular and intramolecular levels,
this paper reviews selected applications of compound-specific isotope analysis
in various scientific fields.


title:
Observation of B^+ Meson Decays to a1(1260)^+ K^0 and B^0 to a1(1260)^-
  K^+

abstract:
  We present branching fraction measurements of the decays B^{+} ->
a1(1260)^{+} K^{0} and B^{0} to a1(1260)^{-} K^{+} with a1(1260)^{+} -> pi^{-}
pi^{+} pi^{+}. The data sample corresponds to 383 million B B-bar pairs
produced in e^{+}e^{-} annihilation through the Y(4S) resonance. We measure the
products of the branching fractions:
  B(B^{+}-> a1(1260)^{+} K^{0})B(a1(1260)^{+} -> pi^{-} pi^{+} pi^{+}) = (17.4
+/- 2.5 +/- 2.2) 10^{-6}
  B(B^{0}-> a1(1260)^{-} K^{+})B(a1(1260)^{-} -> pi^{+} pi^{-} pi^{-}) = (8.2
+/- 1.5 +/- 1.2) 10^{-6}.
  We also measure the charge asymmetries A_{ch}(B^{+} -> a1(1260)^{+} K^{0})=
0.12 +/- 0.11 +/- 0.02 and A_{ch}(B^{0} -> a1(1260)^{-} K^{+})= -0.16 +/- 0.12
+/- 0.01. The first uncertainty quoted is statistical and the second is
systematic.


title:
Timescale effect estimation in time-series studies of air pollution and
  health: A Singular Spectrum Analysis approach

abstract:
  A wealth of epidemiological data suggests an association between
mortality/morbidity from pulmonary and cardiovascular adverse events and air
pollution, but uncertainty remains as to the extent implied by those
associations although the abundance of the data. In this paper we describe an
SSA (Singular Spectrum Analysis) based approach in order to decompose the
time-series of particulate matter concentration into a set of exposure
variables, each one representing a different timescale. We implement our
methodology to investigate both acute and long-term effects of $PM_{10}$
exposure on morbidity from respiratory causes within the urban area of Bari,
Italy.


title: Automatic generation of vertices for the Schroedinger functional

abstract:
  We present a multiplication algorithm to recursively construct vertices for
the Schroedinger functional in the abelian background field case. The algorithm
is suited for automatic perturbative calculations with a variety of actions. As
first applications, we derive ratios of the lambda parameters between the
lattice scheme (improved gauge actions including six link loops) and the
$\bar{\rm MS}$ scheme, and one-loop results for the Schroedinger functional
coupling with a lattice $T=L \pm a$, which is motivated by considering
staggered fermions.


title:
Two-phonon assisted exciton spin relaxation due to exchange interaction
  in spherical quantum dots

abstract:
  Spin relaxation in undoped quasi-spherical CdS quantum dots at zero magnetic
fields is investigated using time- and polarization-resolved transient
absorption measurements. Unlike in previous studies of these systems, the
measured signals were corrected for spin-insensitive contributions to the
exciton bleaching dynamics, {allowing us to determine} the pure spin-related
exciton dynamics. To explain the observed room-temperature spin-relaxation time
of several nanoseconds, we propose a novel mechanism based on intralevel
exciton transitions with the emission of one LO phonon, the absorption of
another LO phonon, and an electron spin flip, which is driven by the
electron-hole exchange interaction. The transition rates, calculated in the
present work for different sizes of quantum dots and temperatures, are in fair
agreement with our experimental results.


title: Exorcizing the Landau Ghost in Non Commutative Quantum Field Theory

abstract:
  We show that the simplest non commutative renormalizable field theory, the
$\phi^4$ model on four dimensional Moyal space with harmonic potential is
asymptotically safe to all orders in perturbation theory


title: Subleading properties of the QCD flux-tube in 3-d lattice gauge theory

abstract:
  We study the continuum limit of the string-like behaviour of flux tubes
formed between static quarks and anti-quarks in three dimensional SU(2) lattice
gauge theory. We compare our simulation data with the predictions of both
effective string models as well as perturbation theory. On the string side we
obtain clear evidence for convergence of data to predictions of Nambu-Goto
theory. We comment on the scales at which the static potential starts departing
from one loop perturbation theory and then again being well described by
effective string theories. We also estimate the leading corrections to the
one-loop perturbative potential as well as the Nambu-Goto effective string. In
the intermediate regions we find an empirical formula which gives surprisingly
good fits.


title:
Global existence for a kinetic model of chemotaxis via dispersion and
  Strichartz estimates

abstract:
  We investigate further the existence of solutions to kinetic models of
chemotaxis. These are nonlinear transport-scattering equations with a quadratic
nonlinearity which have been used to describe the motion of bacteria since the
80's when experimental observations have shown they move by a series of 'run
and tumble'. The existence of solutions has been obtained in several papers
[Chalub et al. Monatsh. Math. 142, 123--141 (2004), Hwang et al. SIAM J. Math.
Anal. 36, 1177--1199 (2005)] using direct and strong dispersive effects.
  Here, we use the weak dispersion estimates of [Castella et al. C. R. Acad.
Sci. Paris 322, 535--540 (1996)] to prove global existence in various
situations depending on the turning kernel. In the most difficult cases, where
both the velocities before and after tumbling appear, with the known methods,
only Strichartz estimates can give a result, with a smallness assumption.


title:
Spin-polarized Current-induced Instability in Spin-Valve with
  Antiferromagnetic Layer

abstract:
  In the framework of phenomenological model we consider dynamics of a
compensated collinear antiferromagnet (AFM) in the presence of spin-polarised
current. The model is based on the assumption that AFM spins are localised and
spin torque is transferred to each magnetic sublattice independently. It is
shown that in AFM spin current i) can be a source of the "negative friction";
and ii) modifies spin-wave frequencies. Equilibrium state of AFM can be
destabilized by the current polarized in parallel to AFM vector. Threshold
current at which the loss of stability takes place depends upon the magnetic
anisotropy of AFM.


title:
An Alternative Form of the Functional Equation for Riemann's Zeta
  Function

abstract:
  In this paper we present a simple method for deriving an alternative form of
the functional equation for Riemann's Zeta function. The connections between
some functional equations obtained implicitly by Leonhard Euler in his work
"Remarques sur un beau rapport entre les series des puissances tant directes
que reciproques" in Memoires de l'Academie des Sciences de Berlin 17, (1768),
permit to define a special function, named A(s), which is fully symmetric and
is similar to Riemann's "XI" function. To be complete we find several integral
representations of the A(s) function and as a direct consequence of the second
integral representation we obtain also an analytic continuation of the same
function using an identity of Ramanujan.


title: Angular Distributions of B -> K ll Decays

abstract:
  We model-independently analyze the angular distributions of B -> K ll decays,
l = e, mu, for low dilepton mass using QCD factorization. Besides the decay
rate, we study the forward-backward asymmetry A_FB^l and a further observable,
F_H^l, which gives rise to a flat term in the angular distribution. We find
that in the Standard Model F_H^l ~ m_l^2, hence vanishing F_H^e and F_H^mu of
around 2% (exact value depends on cuts) with a very small theoretical
uncertainty of a few percent. We also give predictions for R_K, the ratio of B
-> K mu mu to B -> K ee decay rates. We analytically show using large recoil
symmetry relations that in the Standard Model R_K equals one up to lepton mass
corrections of the order 10^(-4). The New Physics reach of the observables from
the B -> K ll angular analysis is explored together with R_K and the B_s -> ll
and B -> X_s ll branching ratios for both l = e and l = mu. We find substantial
room for signals from (pseudo-) scalar and tensor interactions beyond the
Standard Model. Experimental investigations of the B -> K mu mu angular
distributions are suitable for the LHC environment and high luminosity B
factories, where also studies of the electron modes are promising.


title: Fast Fourier Transforms for the Rook Monoid

abstract:
  We define the notion of the Fourier transform for the rook monoid (also
called the symmetric inverse semigroup) and provide two efficient
divide-and-conquer algorithms (fast Fourier transforms, or FFTs) for computing
it. This paper marks the first extension of group FFTs to non-group semigroups.


title: Angular momentum quantization from Planck's energy quantization

abstract:
  We present in this work a pedagogical way of quantizing the atomic orbit for
the hydrogen's atom model proposed by Bohr without using his hypothesis of
angular momentum quantization. In contrast to the usual treatment for the
orbital quantization, we show that using energy conservation, correspondence
principle and Plank's energy quantization Bohr's hypothesis can be deduced from
and is a consequence of the Planck's energy quantization.


title:
Detailed Spectral Modeling of a 3-D Pulsating Reverse Detonation Model:
  Too Much Nickel

abstract:
  We calculate detailed NLTE synthetic spectra of a Pulsating Reverse
  Detonation (PRD) model, a novel explosion mechanism for Type Ia supernovae.
While the hydro models are calculated in 3-D, the spectra use an angle averaged
hydro model and thus some of the 3-D details are lost, but the overall average
should be a good representation of the average observed spectra. We study the
model at 3 epochs: maximum light, seven days prior to maximum light, and 5 days
after maximum light. At maximum the defining Si II feature is prominent, but
there is also a prominent C II feature, not usually observed in normal SNe Ia
near maximum. We compare to the early spectrum of SN 2006D which did show a
prominent C II feature, but the fit to the observations is not compelling.
Finally we compare to the post-maximum UV+optical spectrum of SN 1992A. With
the broad spectral coverage it is clear that the iron-peak elements on the
outside of the model push too much flux to the red and thus the particular PRD
realizations studied would be intrinsically far redder than observed SNe Ia. We
briefly discuss variations that could improve future PRD models.


title: Threshold phenomena on product spaces: BKKKL revisited (once more)

abstract:
  We revisit the work of Bourgain, Kahn, Kalai, Katznelson and Linial (1992) --
referred to as ``BKKKL'' in the title -- about influences on Boolean functions
in order to give a precise statement of threshold phenomenon on the product
space $\{1,..., r\}^\NN$, generalizing one of the main results of a paper by
Talagrand (1994).


title: Relaxational dynamics in 3D randomly diluted Ising models

abstract:
  We study the purely relaxational dynamics (model A) at criticality in
three-dimensional disordered Ising systems whose static critical behaviour
belongs to the randomly diluted Ising universality class. We consider the
site-diluted and bond-diluted Ising models, and the +- J Ising model along the
paramagnetic-ferromagnetic transition line. We perform Monte Carlo simulations
at the critical point using the Metropolis algorithm and study the dynamic
behaviour in equilibrium at various values of the disorder parameter. The
results provide a robust evidence of the existence of a unique model-A dynamic
universality class which describes the relaxational critical dynamics in all
considered models. In particular, the analysis of the size-dependence of
suitably defined autocorrelation times at the critical point provides the
estimate z=2.35(2) for the universal dynamic critical exponent. We also study
the off-equilibrium relaxational dynamics following a quench from T=\infty to
T=T_c. In agreement with the field-theory scenario, the analysis of the
off-equilibrium dynamic critical behavior gives an estimate of z that is
perfectly consistent with the equilibrium estimate z=2.35(2).


title:
Local superfluid densities probed via current-induced superconducting
  phase gradients

abstract:
  We have developed a superconducting phase gradiometer consisting of two
parallel DNA-templated nanowires connecting two thin-film leads. We have ramped
the cross current flowing perpendicular to the nanowires, and observed
oscillations in the lead-to-lead resistance due to cross-current-induced phase
differences. By using this gradiometer we have measured the temperature and
magnetic field dependence of the superfluid density and observed an
amplification of phase gradients caused by elastic vortex displacements. We
examine our data in light of Miller-Bardeen theory of dirty superconductors and
a microscale version of Campbell's model of field penetration.


title: Violation of the Wiedemann-Franz Law in a Single-Electron Transistor

abstract:
  We study the influence of Coulomb interaction on the thermoelectric transport
coefficients for a metallic single-electron transistor. By performing a
perturbation expansion up to second order in the tunnel-barrier conductance, we
include sequential and cotunneling processes as well as quantum fluctuations
that renormalize the charging energy and the tunnel conductance. We find that
Coulomb interaction leads to a strong violation of the Wiedemann-Franz law: the
Lorenz ratio becomes gate-voltage dependent for sequential tunneling, and is
increased by a factor 9/5 in the cotunneling regime. Finally, we suggest a
measurement scheme for an experimental realization.


title:
Giant magnetoresistance and extraordinary magnetoresistance in
  inhomogeneous semiconducting DyNiBi

abstract:
  The semiconducting half-Heulser compound DyNiBi shows a negative giant
magnetoresistance (GMR) below 200 K. Except for a weak deviation, this
magnetoresistance scales roughly with the square of the magnetization in the
paramagnetic state, and is related to the metal-insulator transition. At low
temperature, a positive magnetoresistance is found, which can be suppressed by
high fields. The magnitude of the positive magnetoresistance changes slightly
with the amount of impurity phase.


title: Role of defects and disorder in the half-metallic full-Heusler compounds

abstract:
  Half-metallic ferromagnets and especially the full-Heusler alloys containing
Co are at the center of scientific research due to their potential applications
in spintronics. For realistic devices it is important to control accurately the
creation of defects in these alloys. We review some of our late results on the
role of defects and impurities in these compounds. More precisely we present
results for the following cases (i) doping and disorder in Co$_2$Cr(Mn)Al(Si)
alloys, (ii) half-metallic ferrimagnetism appeared due to the creation of
Cr(Mn) antisites in these alloys, (iii) Co-doping in Mn$_2$VAl(Si) alloys
leading to half-metallic antiferromagnetism, and finally (iv) the occurrence of
vacancies in the full-Heusler alloys containing Co and Mn. These results are
susceptible of encouraging further theoretical and experimental research in the
properties of these compounds.


title:
Observation of Ds1(2536)+ -> D+pi-K+ and angular decomposition of
  Ds1(2536)+ -> D*+K0S

abstract:
  Using 462/fb of e+e- annihilation data recorded by the Belle detector, we
report the first observation of the decay Ds1(2536)+ -> D+pi-K+. The ratio of
branching fractions B(Ds1+ -> D+pi-K+)/B(Ds1+ -> D*+K0) is measured to be
(3.27+-0.18+-0.37)%. We also study the angular distributions in the Ds1(2536)+
-> D*+K0S decay and measure the ratio of D- and S-wave amplitudes. The S-wave
dominates, with a partial width of Gamma_S/Gamma_total=0.72+-0.05+-0.01.


title:
On local equivalence problem of spacetimes with two orthogonally
  transitive commuting Killing fields

abstract:
  Considered is the problem of local equivalence of generic four-dimensional
metrics possessing two commuting and orthogonally transitive Killing vector
fields. A sufficient set of eight differential invariants is explicitly
constructed, among them four of first order and four of second order in terms
of metric coefficients. In vacuum case the four first-order invariants suffice
to distinguish generic metrics.


title: The Accretion Flows and Evolution of Magnetic Cataclysmic Variables

abstract:
  We have used a model of magnetic accretion to investigate the accretion flows
of magnetic cataclysmic variables. Numerical simulations demonstrate that four
types of flow are possible: discs, streams, rings and propellers. The
fundamental observable determining the accretion flow, for a given mass ratio,
is the spin-to-orbital period ratio of the system. If IPs are accreting at
their equilibrium spin rates, then for a mass ratio of 0.5, those with
Pspin/Porb < 0.1 will be disc-like, those with 0.1 < Pspin/Porb < 0.6 will be
stream-like, and those with Pspin/Porb ~ 0.6 will be ring-like. The spin to
orbital period ratio at which the systems transition between these flow types
increases as the mass ratio of the stellar components decreases.
  For the first time we present evolutionary tracks of mCVs which allow
investigation of how their accretion flow changes with time. As systems evolve
to shorter orbital periods and smaller mass ratios, in order to maintain spin
equilibrium, their spin-to-orbital period ratio will generally increase. As a
result, the relative occurrence of ring-like flows will increase, and the
occurrence of disc-like flows will decrease, at short orbital periods. The
growing number of systems observed at high spin-to-orbital period ratios with
orbital periods below 2h, and the observational evidence for ring-like
accretion in EX Hya, are fully consistent with this picture.


title: A Semiclassical String Description of Wilson Loop with Local Operators

abstract:
  We discuss a semiclassical string description to circular Wilson loops
without/with local operator insertions. By considering a semiclassical
approximation of type IIB string theory on AdS_5 X S^5 around the corresponding
classical solutions, quadratic actions with respect to fluctuations are
computed. Then the dual corresponding operators describing the fluctuations are
discussed from the point of view of a small deformation of the Wilson loops.
The result gives new evidence for AdS/CFT correspondence.


title:
Charge imbalance and Josephson effects in superconductor-normal metal
  mesoscopic structures

abstract:
  We consider a $SBS$ Josephson junction the superconducting electrodes $S$ of
which are in contact with normal metal reservoirs ($B$ means a barrier). For
temperatures near $T_{c}$ we calculate an effective critical current $%
I_{c}^{\ast}$ and the resistance of the system at the currents $I<$ $%
I_{c}^{\ast}$ and $I>>I_{c}^{\ast}$. It is found that the charge imbalance,
which arises due to injection of quasiparticles from the $N$ reservoirs into
the $S$ wire, affects essentially the characteristics of the structure. The
effective critical current $I_{c}^{\ast}$ is always larger than the critical
current $I_{c}$ in the absence of the normal reservoirs and increases with
decreasing the ratio of the length of the $S$ wire $2L$ to the charge imbalance
relaxation length $l_{Q}$. It is shown that a series of peaks arises on the
$I-V$ characteristics due to excitation of the Carlson-Goldman collective
modes. We find the position of Shapiro steps which deviates from that given by
the Josephson relation.


title: Strong homotopy inner product of an A-infinity algebra

abstract:
  We introduce a strong homotopy notion of a cyclic symmetric inner product of
an A-infinity algebra and prove a characterization theorem in the formalism of
the infinity inner products by Tradler. We also show that it is equivalent to
the notion of a non-constant symplectic structure on the corresponding formal
non-commutative supermanifold. We show that (open Gromov-Witten type) potential
for a cyclic filtered A-infinity algebra is invariant under the cyclic filtered
A-infinity homomorphism up to reparametrization, cyclization and a constant
addition, generalizing the work of Kajiura.


title: Local to Global Compatibility on the Eigencurve (l not equal p)

abstract:
  We generalise Coleman's construction of Hecke operators to define an action
of GL_2(Q_l) on the space of finite slope overconvergent p-adic modular forms
(l not equal p). In this way we associate to any C_p-valued point on the tame
level N Coleman-Mazur eigencurve an admissible smooth representation of
GL_2(Q_l) extending the classical construction. Using the Galois theoretic
interpretation of the eigencurve we associate a 2-dimensional Weil-Deligne
representation to such points and show that away from a discrete set they agree
under the Local Langlands correspondence.


title: Two Sides of Spin Concept

abstract:
  The notion of the spin is shown to have two constituents, as exemplified by
the spin of the electron. The first one is related to the form of the wave
equation and determines the fermion or boson particle type. This implies the
spin taking strictly half-integer or integer number. The second side of spin
manifestation is related to the physical nature of the spin of the electron
(and the corresponding magnetic moment) in the interaction resulting in
nonuniform motion. It is shown that in this manifestation spin is no more fixed
constant.


title: Parametrization of the Driven Betatron Oscillation

abstract:
  An AC dipole is a magnet which produces a sinusoidally oscillating dipole
field and excites coherent transverse beam motion in a synchrotron. By
observing this coherent motion, the optical parameters can be directly measured
at the beam position monitor locations. The driven oscillation induced by an AC
dipole will generate a phase space ellipse which differs from that of the free
oscillation. If not properly accounted for, this difference can lead to a
misinterpretation of the actual optical parameters, for instance, of 6% or more
in the cases of the Tevatron, RHIC, or LHC. The effect of an AC dipole on the
linear optics parameters is identical to that of a thin lens quadrupole. By
introducing a new amplitude function to describe this new phase space ellipse,
the motion produced by an AC dipole becomes easier to interpret. Beam position
data taken under the influence of an AC dipole, with this new interpretation in
mind, can lead to more precise measurements of the normal Courant-Snyder
parameters. This new parameterization of the driven motion is presented and is
used to interpret data taken in the FNAL Tevatron using an AC dipole.


title: Exact Vacuum Energy of Orbifold Lattice Theories

abstract:
  We investigate the orbifold lattice theories constructed from supersymmetric
Yang-Mills matrix theories (mother theories) with four and eight supercharges.
We show that the vacuum energy of these theories does not receive any quantum
correction perturbatively.


title:
Microscopic theory of the Casimir force at thermal equilibrium:
  large-separation asymptotics

abstract:
  We present an entirely microscopic calculation of the Casimir force $f(d)$
between two metallic plates in the limit of large separation $d$. The models of
metals consist of mobile quantum charges in thermal equilibrium with the photon
field at positive temperature $T$. Fluctuations of all degrees of freedom,
matter and field, are treated according to the principles of quantum
electrodynamics and statistical physics without recourse to approximations or
intermediate assumptions. Our main result is the correctness of the asymptotic
universal formula $ f(d) \sim -\frac{\zeta(3) \kB T}{8\pi d^3}$, $d\to\infty$.
This supports the fact that, in the framework of Lifshitz' theory of
electromagnetic fluctuations, transverse electric modes do not contribute in
this regime. Moreover the microscopic origin of universality is seen to rely on
perfect screening sum rules that hold in great generality for conducting media.


title: Monte Carlo studies of the VERITAS array of Cherenkov telescopes

abstract:
  VERITAS is a system of four imaging Cherenkov telescopes located at the Fred
Lawrence Whipple Observatory in southern Arizona. We present here results of
detailed Monte Carlo simulations of the array response to extensive air
showers. Cherenkov image and shower parameter distributions are calculated and
show good agreement with distributions obtained from observations of background
cosmic rays and high-energy gamma-rays. Cosmic-ray and gamma-ray rates are
accurately predicted by the simulations. The energy threshold of the
3-telescope system is about 150 GeV after gamma-hadron separation cuts; the
detection rate after gamma-selection cuts for the Crab Nebula is 7.5
gamma's/min. The three-telescope system is able to detect a source with a flux
equivalent to 10% of the Crab Nebula flux in 1.2 h of observations (5 sigma
detection).


title:
Tensor Meson Production in Proton-Proton Collisions from the Color Glass
  Condensate

abstract:
  We compute the inclusive cross-section of $f_{2}$ tensor mesons production in
proton-proton collisions at high-energy. We use an effective theory inspired
from the tensor meson dominance hypothesis that couples gluons to $f_{2}$
mesons. We compute the differential cross-section in the
$k_{\perp}$-factorization and in the Color Glass Condensate formalism in the
low density regime. We show that the two formalisms are equivalent for this
specific observable. Finally, we study the phenomenology of $f_{2}$ mesons by
comparing theoretical predictions of different parameterizations of the
unintegrated gluon distribution function. We find that $f_{2}$-meson production
is another observable that can be used to put constraints on these
distributions.


title: Search for supernova-produced 60Fe in a marine sediment

abstract:
  An 60Fe peak in a deep-sea FeMn crust has been interpreted as due to the
signature left by the ejecta of a supernova explosion close to the solar system
2.8 +/- 0.4 Myr ago [Knie et al., Phys. Rev. Lett. 93, 171103 (2004)]. To
confirm this interpretation with better time resolution and obtain a more
direct flux estimate, we measured 60Fe concentrations along a dated marine
sediment. We find no 60Fe peak at the expected level from 1.7 to 3.2 Myr ago.
However, applying the same chemistry used for the sediment, we confirm the 60Fe
signal in the FeMn crust. The cause of the discrepancy is discussed.


title: Quantized Detector Networks: A review of recent developments

abstract:
  QDN (quantized detector networks) is a description of quantum processes in
which the principal focus is on observers and their apparatus, rather than on
states of SUOs (systems under observation). It is a realization of Heisenberg's
original instrumentalist approach to quantum physics and can deal with time
dependent apparatus, multiple observers and inter-frame physics. QDN is most
naturally expressed in the mathematical language of quantum computation, a
language ideally suited to describe quantum experiments as processes of
information exchange between observers and their apparatus. Examples in quantum
optics are given, showing how the formalism deals with quantum interference,
non-locality and entanglement. Particle decays, relativity and non-linearity in
quantum mechanics are discussed.


title:
Isotope effect on superconductivity in Josephson coupled stripes in
  underdoped cuprates

abstract:
  Inelastic neutron scattering data for YBaCuO as well as for LaSrCuO indicate
incommensurate neutron scattering peaks with incommensuration $\delta(x)$ away
from the $(\pi,\pi)$ point. $T_c(x)$ can be replotted as a linear function of
the incommensuration for these materials. This linear relation implies that the
constant that relates these two quantities, one being the incommensuration
(momentum) and another being $T_c(x)$ (energy), has the dimension of velocity
we denote $v^*$: $k_B T_c(x) = \hbar v^* \delta(x)$. We argue that this
experimentally derived relation can be obtained in a simple model of Josephson
coupled stripes. Within this framework we address the role of the $O^{16} \to
O^{18}$ isotope effect on the $T_c(x)$. We assume that the incommensuration is
set by the {\em doping} of the sample and is not sensitive to the oxygen
isotope given the fixed doping. We find therefore that the only parameter that
can change with O isotope substitution in the relation $T_c(x) \sim \delta(x)$
is the velocity $v^*$. We predict an oxygen isotope effect on $v^*$ and expect
it to be $\simeq 5%$.


title:
Copy Number Variants and Segmental Duplications Show Different Formation
  Signatures

abstract:
  In addition to variation in terms of single nucleotide polymorphisms (SNPs),
whole regions ranging from several kilobases up to a megabase in length differ
in copy number among individuals. These differences are referred to as Copy
Number Variants (CNVs) and extensive mapping of these is underway. Recent
studies have highlighted their great prevalence in the human genome. Segmental
Duplications (SDs) are long (>1kb) stretches of duplicated DNA with high
sequence identity. First, we analyzed the co-localization of SDs and find that
SDs are significantly co-localized with each other, resulting in a power-law
distribution, which suggests a preferential attachment mechanism, i.e. existing
SDs are likely to be involved in creating new ones nearby. Second, we look at
the relationship of CNVs/SDs with various types of repeats. We we find that the
previously recognized association of SDs with Alu elements is significantly
stronger for older SDs and is sharply decreasing for younger ones. While it
might be expected that the patterns should be similar for SDs and CNVs, we
find, surprisingly, no association of CNVs with Alu elements. This trend is
consistent with the decreasing correlation between Alu elements and younger
SDs, the activity of Alu elements has been decreasing and by now it they seem
no longer active. Furthermore, we find a striking association of SDs with
processed pseudogenes suggesting that they may also have mediated SD formation.
Moreover, find strong association with microsatellites for both SDs and CNVs
that suggests a role for satellites in the formation of both.


title:
Consequences of the Production of Very Massive Magnetically Charged
  Leptons Early in the Universe and Their Decays to a New Set of Extremely
  Massive Neutrinos

abstract:
  We examine the production and decay of extremely heavy magnetically charged
leptons, (tau_g and mu_g), to their own very heavy mu_g and e_g plus their own
new species of neutrinos, nu_g and nubar_g, at some time early in the universe
which could be present in space and, attracted gravitationally towards and
passing through astronomical objects, annihilated with each other to produce
large numbers of photons. Further, we describe the possibility of presently
detecting the bursts of such photons, of three different total energies, in the
seas or oceans on earth.


title: SUSY Multi-Step Unification without Doublet-Triplet Splitting

abstract:
  Matter-Higgs unification in string-inspired supersymmetric Grand Unified
Theories predicts the existence of colored states in the Higgs multiplets and
calls for two extra generations of Higgs-like fields ('unhiggses'). If these
states are present near the TeV scale, gauge-coupling unification points to the
existence of two distinct scales, 10^15 GeV where right-handed neutrinos and a
Pati-Salam symmetry appear, and 10^18 GeV where complete unification is
achieved. Baryon-number conservation, while not guaranteed, can naturally
emerge from an underlying flavor symmetry. Collider signatures and dark-matter
physics may be drastically different from the conventional MSSM.


title: Profile of Two-Higgs-Doublet-Model Parameter Space

abstract:
  We review recent work on constraining the parameter space of the
Two-Higgs-Doublet Model by theoretical and experimental results. Some
characteristics of the model, in particular the distribution of masses in the
surviving parameter space, are discussed.


title: On stable constant mean curvature surfaces in S2 X R and H2 X R

abstract:
  We study stable compact constant mean curvature surfaces in the product
spaces S2 X R and H2 X R and in some other Riemannian 3-manifolds.


title:
Comment on: Competing Interactions, the Renormalization Group, and the
  Isotropic-Nematic Phase Transition, by D. Barci and D. Stariolo, Phys. Rev.
  Lett. 98, 200604 (2007)

abstract:
  In a recent PRL Barci and Stariolo (BS) generalized the well known Brazovskii
model to include an additional rotationally invariant quartic interaction and
study this model in two dimensions (2d). Depending on the parameters of the
model, BS find two transitions: a first order isotropic-lamellar (striped) or a
second order isotropic-nematic (which they speculate to be in the
Kosterlitz-Thouless universality class). Using a simple symmetry argument, I
show that the striped phase found by BS can not exist in 2d. Furthermore, I
argue that based on the coarse-grained action used by BS it is impossible to
reach any conclusion about the nature of the isotropic-nematic transition.


title: In silico network topology-based prediction of gene essentiality

abstract:
  The identification of genes essential for survival is important for the
understanding of the minimal requirements for cellular life and for drug
design. As experimental studies with the purpose of building a catalog of
essential genes for a given organism are time-consuming and laborious, a
computational approach which could predict gene essentiality with high accuracy
would be of great value. We present here a novel computational approach, called
NTPGE (Network Topology-based Prediction of Gene Essentiality), that relies on
network topology features of a gene to estimate its essentiality. The first
step of NTPGE is to construct the integrated molecular network for a given
organism comprising protein physical, metabolic and transcriptional regulation
interactions. The second step consists in training a decision tree-based
machine learning algorithm on known essential and non-essential genes of the
organism of interest, considering as learning attributes the network topology
information for each of these genes. Finally, the decision tree classifier
generated is applied to the set of genes of this organism to estimate
essentiality for each gene. We applied the NTPGE approach for discovering
essential genes in Escherichia coli and then assessed its performance.


title:
Deep study of the fast bipolar outflows in pre-PNe from CO mm-wave line
  emission

abstract:
  High spatial resolution images of PNe have shown their extremely complex
morphology. However, the circumstellar envelopes of their progenitors, the AGB
stars, are strikingly spherical. In order to understand the carving processes
leading to axisymmetric nebulae, we are carrying out a study of a large sample
of pre-PNe. Our emission model of the nebular molecular gas (12CO & 13CO) will
allow us to determine important physical parameters (mass, linear momentum,
kinetic energy) of the fast bipolar and slow spherical nebular components
separately. We will study in an innovative way the properties for each source
individually, and put our results in an evolutionary context with the help of
the data obtained by us and collected from the literature.


title: Analysis of Flash ADC Data With VERITAS

abstract:
  VERITAS employs a 12m segmented mirror and pixellated photomultiplier tube
camera to detect the brief pulse of Cherenkov radiation produced by the
extensive air shower initiated by a cosmic high-energy gamma ray. The VERITAS
data acquisition system consists of a 500 Mega-Sample-Per-Second custom-built
flash ADC system, which samples the Cherenkov light pulse every 2 nanoseconds.
The integrated charge in each flash ADC channel is proportional to the amount
of Cherenkov light incident on the corresponding photomultiplier tube. Accurate
reconstruction of the integrated charge is required for accurate energy
estimation and spectral reconstruction. A reliable calculation of the
integrated charge at low intensities can lead to a reduction in the energy
threshold of the system, and an increase in sensitivity. This paper
investigates and compares several approaches for evaluating the integrated
charge. The Cherenkov pulse timing information in the flash ADC readout has the
potential to assist in background rejection techniques. Various methods for
extracting the timing information are investigated and excellent timing
resolution is achieved.


title: Information capacity of genetic regulatory elements

abstract:
  Changes in a cell's external or internal conditions are usually reflected in
the concentrations of the relevant transcription factors. These proteins in
turn modulate the expression levels of the genes under their control and
sometimes need to perform non-trivial computations that integrate several
inputs and affect multiple genes. At the same time, the activities of the
regulated genes would fluctuate even if the inputs were held fixed, as a
consequence of the intrinsic noise in the system, and such noise must
fundamentally limit the reliability of any genetic computation. Here we use
information theory to formalize the notion of information transmission in
simple genetic regulatory elements in the presence of physically realistic
noise sources. The dependence of this "channel capacity" on noise parameters,
cooperativity and cost of making signaling molecules is explored
systematically. We find that, at least in principle, capacities higher than one
bit should be achievable and that consequently genetic regulation is not
limited the use of binary, or "on-off", components.


title:
Influence of Zeeman splitting and thermally excited polaron states on
  magneto-electrical and magneto-thermal properties of magnetoresistive
  polycrystalline manganite La_{0.8}Sr_{0.2}MnO_3

abstract:
  Some possible connection between spin and charge degrees of freedom in
magneto-resistive manganites is investigated through a thorough experimental
study of the magnetic (AC susceptibility and DC magnetization) and transport
(resistivity and thermal conductivity) properties. Measurements are reported in
the case of well characterized polycrystalline La_{0.8}Sr_{0.2}MnO_3 samples.
The experimental results suggest rather strong field-induced polarization
effects in our material, clearly indicating the presence of ordered FM regions
inside the semiconducting phase. Using an analytical expression which fits the
spontaneous DC magnetization, the temperature and magnetic field dependences of
both electrical resistivity and thermal conductivity data are found to be well
reproduced through a universal scenario based on two mechanisms: (i) a
magnetization dependent spin polaron hopping influenced by a Zeeman splitting
effect, and (ii) properly defined thermally excited polaron states which have
to be taken into account in order to correctly describe the behavior of the
less conducting region. Using the experimentally found values of the magnetic
and electron localization temperatures, we obtain L=0.5nm and m_p=3.2m_e for
estimates of the localization length (size of the spin polaron) and effective
polaron mass, respectively.


title: Chandra ACIS Survey of M33 (ChASeM33): A First Look

abstract:
  We present an overview of the Chandra ACIS Survey of M33 (ChASeM33): A Deep
Survey of the Nearest Face-on Spiral Galaxy. The 1.4 Ms survey covers the
galaxy out to $R \approx 18\arcmin (\approx 4$ kpc). These data provide the
most intensive, high spatial resolution assessment of the X-ray source
populations available for the confused inner regions of M33. Mosaic images of
the ChASeM33 observations show several hundred individual X-ray sources as well
as soft diffuse emission from the hot interstellar medium. Bright, extended
emission surrounds the nucleus and is also seen from the giant \hii regions NGC
604 and IC 131. Fainter extended emission and numerous individual sources
appear to trace the inner spiral structure. The initial source catalog, arising
from $\sim$~2/3 of the expected survey data, includes 394 sources significant
at the $3\sigma$ confidence level or greater, down to a limiting luminosity
(absorbed) of $\sim$1.6\ergs{35} (0.35 -- 8.0 keV). The hardness ratios of the
sources separate those with soft, thermal spectra such as supernova remnants
from those with hard, non-thermal spectra such as X-ray binaries and background
active galactic nuclei. Emission extended beyond the Chandra point spread
function is evident in 23 of the 394 sources. Cross-correlation of the ChASeM33
sources against previous catalogs of X-ray sources in M33 results in matches
for the vast majority of the brighter sources and shows 28 ChASeM33 sources
within 10\arcsec of supernova remnants identified by prior optical and radio
searches. This brings the total number of such associations to 31 out of 100
known supernova remnants in M33.


title:
Exact diagonalization analysis of the Anderson-Hubbard model and
  comparison to real-space self-consistent Hartree-Fock solutions

abstract:
  We have obtained the exact ground state wave functions of the
Anderson-Hubbard model for different electron fillings on a 4x4 lattice with
periodic boundary conditions - for 1/2 filling such ground states have roughly
166 million states. When compared to the uncorrelated ground states (Hubbard
interaction set to zero) we have found strong evidence of the very effective
screening of the charge homogeneities due to the Hubbard interaction. We have
successfully modelled these local charge densities using a non-interacting
model with a static screening of the impurity potentials. In addition, we have
compared such wave functions to self-consistent real-space unrestricted
Hartree-Fock solutions and have found that these approximate ground state wave
functions are remarkably successful at reproducing the local charge densities,
and may indicate the role of dipolar backflow in producing a novel metallic
state in two dimensions.


title: Hamiltonian Lattice QCD near the Light Cone

abstract:
  We give a status report of our work on light cone Hamiltonian lattice QCD. We
have derived an effective Hamiltonian $H_{eff}$ which is only quadratic in the
momenta and therefore can be simulated by standard methods. For this
Hamiltonian we determine variationally an approximate ground state wave
functional in the light cone limit.


title:
Destruction of first-order phase transition in a random-field Ising
  model

abstract:
  The phase transitions that occur in an infinite-range-interaction Ising
ferromagnet in the presence of a double-Gaussian random magnetic field are
analyzed. Such random fields are defined as a superposition of two Gaussian
distributions, presenting the same width $\sigma$. Is is argued that this
distribution is more appropriate for a theoretical description of real systems
than its simpler particular cases, i.e., the bimodal ($\sigma=0$) and the
single Gaussian distributions. It is shown that a low-temperature first-order
phase transition may be destructed for increasing values of $\sigma$, similarly
to what happens in the compound $Fe_{x}Mg_{1-x}Cl_{2}$, whose
finite-temperature first-order phase transition is presumably destructed by an
increase in the field randomness.


title: Multiplicity one Theorems

abstract:
  In the local, characteristic 0, non archimedean case, we consider
distributions on GL(n+1) which are invariant under the adjoint action of GL(n).
We prove that such distributions are invariant by transposition. This implies
that an admissible irreducible representation of GL(n+1), when restricted to
GL(n) decomposes with multiplicity one.
  Similar Theorems are obtained for orthogonal or unitary groups.


title: Critical structure of the QCD medium

abstract:
  Fluctuations in the vicinity of a phase transition are important but
neglected in mean-field theory. In order to assess the influence of such
fluctuations on the critical endpoint and the size of the critical region in
the QCD phase diagram, a mean-field calculation of a two-flavor quark-meson
model is compared with a renormalization group approach. However, due to the
lack of confinement in this effective model the equation of state near the
chiral phase transition is still unrealistic. A first improvement of this model
can be achieved by coupling quark degrees of freedom to the Polyakov loop,
consequently incorporating certain aspects of confinement. The influence of
these modifications on the resulting phase diagram is discussed.


title: Weak measurement and control of entanglement generation

abstract:
  In this paper we show how weak joint measurement and local feedback can be
used to control entanglement generation between two qubits. To do this, we make
use of a decoherence free subspace (DFS). Weak measurement and feedback can be
used to drive the system into this subspace rapidly. Once within the subspace,
feedback can generate entanglement rapidly, or turn off entanglement generation
dynamically. We also consider, in the context of weak measurement, some of
differences between purification and generating entanglement.


title: A Monolithic Pixel Sensor in 0.15 micron Fully Depleted SOI Technology

abstract:
  This letter presents the design of a monolithic pixel sensor with 10x10
micron^2 pixels in OKI 0.15 micron fully depleted SOI technology and first
results of its characterisation. The response of the chip to charged particles
has been studied on the 1.35 GeV electron beam at the LBNL ALS.


title:
Is the sky falling? Searching for stellar streams in the local Milky Way
  disc in the CORAVEL and RAVE surveys

abstract:
  We have searched for in-falling stellar streams on to the local Milky Way
disc in the CORAVEL and RAVE surveys. The CORAVEL survey consists of local
dwarf stars (Nordstrom et al. Geneva-Copenhagen survey) and local Famaey et al.
giant stars. We select RAVE stars with radial velocities that are sensitive to
the Galactic vertical space velocity (Galactic latitude b < -45 deg). Kuiper
statistics have been employed to test the symmetry of the Galactic vertical
velocity distribution functions in these samples for evidence of a net vertical
flow that could be associated with a (tidal?) stream of stars with vertically
coherent kinematics. In contrast to the `Field of Streams' found in the outer
halo, we find that the local volumes of the solar neighbourhood sampled by the
CORAVEL dwarfs (complete within ~3 x 10^-4 kpc^3), CORAVEL giants (complete
within ~5 x 10^-2 kpc^3) and RAVE (5-15% complete within ~8 kpc^3) are devoid
of any vertically coherent streams containing hundreds of stars. This is
sufficiently sensitive to allow our RAVE sample to rule out the passing of the
tidal stream of the disrupting Sagittarius (Sgr) dwarf galaxy through the solar
neighbourhood. This agrees with the most recent determination of its orbit and
dissociates it from the Helmi et al. halo stream. Our constraints on the
absence of the Sgr stream near the Sun could prove a useful tool for
discriminating between Galactic potential models. The lack of a net vertical
flow through the solar neighbourhood in the CORAVEL giants and RAVE samples
argues against the Virgo overdensity crossing the disc near the Sun. There are
no vertical streams in the CORAVEL giants and RAVE samples with stellar
densities >1.6 x 10^4 and 1.5 x 10^3 stars kpc^-3 respectively and therefore no
evidence for locally enhanced dark matter.


title: Non-thermal emission processes in massive binaries

abstract:
  In this paper, I present a general discussion of several astrophysical
processes likely to play a role in the production of non-thermal emission in
massive stars, with emphasis on massive binaries. Even though the discussion
will start in the radio domain where the non-thermal emission was first
detected, the census of physical processes involved in the non-thermal emission
from massive stars shows that many spectral domains are concerned, from the
radio to the very high energies.
  First, the theoretical aspects of the non-thermal emission from early-type
stars will be addressed. The main topics that will be discussed are
respectively the physics of individual stellar winds and their interaction in
binary systems, the acceleration of relativistic electrons, the magnetic field
of massive stars, and finally the non-thermal emission processes relevant to
the case of massive stars. Second, this general qualitative discussion will be
followed by a more quantitative one, devoted to the most probable scenario
where non-thermal radio emitters are massive binaries. I will show how several
stellar, wind and orbital parameters can be combined in order to make some
semi-quantitative predictions on the high-energy counterpart to the non-thermal
emission detected in the radio domain.
  These theoretical considerations will be followed by a census of results
obtained so far, and related to this topic... (see paper for full abstract)


title:
NNLO QCD corrections to event shape variables in electron positron
  annihilation

abstract:
  Precision studies of QCD at electron-positron colliders are based on
measurements of event shapes and jet rates. To match the high experimental
accuracy, theoretical predictions to next-to-next-to-leading order (NNLO) in
QCD are needed for a reliable interpretation of the data. We report the first
calculation of NNLO corrections O(alpha_s^3) to three-jet production and
related event shapes, and discuss their phenomenological impact.


title: Archimedes' balance and Bianchi's Backlund transformation for quadrics

abstract:
  We establish a link between Archimedes' method of integration for calculating
areas, volumes and centers of mass of segments of parabolas and quadrics of
revolution by factorization via the moments of a balance and an integration
technique for a particular integrable system, namely Bianchi's B\"{a}cklund
transformation for quadrics.


title:
Measurement of the Open Charm Cross-Section in $\sqrt{s_{NN}}$ = 200 GeV
  Cu+Cu Collisions at STAR

abstract:
  We present the mid-rapidity $(D^{0} + \bar{D^{0}})/2$ yield measured in
$\sqrt{s_{NN}}$ = 200 GeV Cu+Cu collisions at RHIC via direct reconstruction
through the $K\pi$ decay channel. A charm cross-section is reported and
compared to theoretical predictions and to previous RHIC experimental results.


title: Methods for Pseudoscalar Flavour-Singlet Mesons with Staggered Fermions

abstract:
  We present the first 2+1 flavour lattice QCD calculations of pseudoscalar
flavour-singlet propagators using improved staggered fermions. We explore the
relevant techniques and discuss prospects for the larger scale studies now in
progress. The disconnected correlator is shown to have a highly non-Gaussian
distribution and reliable estimates of the errors require care.


title:
The status of Quantum Geometry in the dynamical sector of Loop Quantum
  Cosmology

abstract:
  This letter is motivated by the recent papers by Dittrich and Thiemann and,
respectively, by Rovelli discussing the status of Quantum Geometry in the
dynamical sector of Loop Quantum Gravity. Since the papers consider model
examples, we also study the issue in the case of an example, namely on the Loop
Quantum Cosmology model of space-isotropic universe. We derive the
Rovelli-Thiemann-Ditrich partial observables corresponding to the quantum
geometry operators of LQC in both Hilbert spaces: the kinematical one and,
respectively, the physical Hilbert space of solutions to the quantum
constraints. We find, that Quantum Geometry can be used to characterize the
physical solutions, and the operators of quantum geometry preserve many of
their kinematical properties.


title: Tent Spaces Associated with Semigroups of Operators

abstract:
  We study tent spaces on general measure spaces $(\Omega, \mu)$. We assume
that there exists a semigroup of positive operators on $L^p(\Omega, \mu)$
satisfying a monotone property but do not assume any geometric/metric structure
on $\Omega$. The semigroup plays the same role as integrals on cones and cubes
in Euclidean spaces. We then study BMO spaces on general measure spaces and get
an analogue of Fefferman's $H^1$-BMO duality theory. We also get a $H^1$-BMO
duality inequality without assuming the monotone property.
  All the results are proved in a more general setting, namely for
noncommutative $L^p$ spaces.


title: Scalar Particle Contribution to Higgs Production via Gluon Fusion at NLO

abstract:
  We consider the gluon fusion production cross section of a scalar Higgs boson
in models where fermion and scalar massive colored particles are present. We
report analytic expressions for the matrix elements of $gg\to Hg$, $q\bar{q}\to
Hg$, and $qg\to Hq$ processes completing the calculation of the NLO QCD
corrections in these extended scenarios. The formulas are written in a complete
general case, allowing a flexible use for different theoretical models.
Applications of our results to two different models are presented: i) a model
in which the SM Higgs sector is augmented by a weak doublet scalar in the
$SU(N_c)$ adjoint representation. ii) The MSSM, in the limit of neglecting the
gluino contribution to the cross section.


title:
Spectral properties in the charge density wave phase of the half-filled
  Falicov-Kimball Model

abstract:
  We study the spectral properties of charge density wave (CDW) phase of the
half-filled spinless Falicov-Kimball model within the framework of the
Dynamical Mean Field Theory. We present detailed results for the spectral
function in the CDW phase as function of temperature and $U$. We show how the
proximity of the non-fermi liquid phase affects the CDW phase, and show that
there is a region in the phase diagram where we get a CDW phase without a gap
in the spectral function. This is a radical deviation from the mean-field
prediction where the gap is proportional to the order parameter.


title: An Extrapolation of Operator Valued Dyadic Paraproducts

abstract:
  We consider the dyadic paraproducts $\pi_\f$ on $\T$ associated with an
$\M$-valued function $\f.$ Here $\T$ is the unit circle and $\M$ is a tracial
von Neumann algebra. We prove that their boundedness on $L^p(\T,L^p(\M))$ for
some $1<p<\infty $ implies their boundedness on $L^p(\T,L^p(\M))$ for all
$1<p<\infty$ provided $\f$ is in an operator-valued BMO space. We also consider
a modified version of dyadic paraproducts and their boundedness on
$L^p(\T,L^p(\M)).


title:
Lower bounds on the blow-up rate of the axisymmetric Navier-Stokes
  equations II

abstract:
  Consider axisymmetric strong solutions of the incompressible Navier-Stokes
equations in $\R^3$ with non-trivial swirl. Let $z$ denote the axis of symmetry
and $r$ measure the distance to the z-axis. Suppose the solution satisfies
either $|v (x,t)| \le C_*{|t|^{-1/2}} $ or, for some $\e > 0$, $|v (x,t)| \le
C_* r^{-1+\epsilon} |t|^{-\epsilon /2}$ for $-T_0\le t < 0$ and $0<C_*<\infty$
allowed to be large. We prove that $v$ is regular at time zero.


title: On the anatomy of multi-spin magnon and single spike string solutions

abstract:
  We study rigid string solutions rotating in $AdS_5\times S^5$ background. For
particular values of the parameters of the solutions we find multispin
solutions corresponding to giant magnons and single spike strings. We present
an analysis of the dispersion relations in the case of three spin solutions
distributed only in $S^5$ and the case of one spin in $AdS_5$ and two spins in
$S^5$. The possible relation of these string solutions to gauge theory
operators and spin chains are briefly discussed.