title: Outflow Driven Turbulence in Molecular Clouds

abstract:
  In this paper we explore the relationship between protostellar outflows and
turbulence in molecular clouds. Using 3-D numerical simulations we focus on the
hydrodynamics of multiple outflows interacting within a parsec scale volume. We
explore the extent to which transient outflows injecting directed energy and
momentum into a sub-volume of a molecular cloud can be converted into random
turbulent motions. We show that turbulence can readily be sustained by these
interactions and show that it is possible to broadly characterize an effective
driving scale of the outflows. We compare the velocity spectrum obtained in our
studies to that of isotropically forced hydrodynamic turbulence finding that in
outflow driven turbulence a power law is indeed achieved. However we find a
steeper spectrum (beta ~ 3) is obtained in outflow driven turbulence models
than in isotropically forced simulations (beta ~ 2). We discuss possible
physical mechanisms responsible for these results as well and their
implications for turbulence in molecular clouds where outflows will act in
concert with other processes such as gravitational collapse.


title: Nanoscale control of exchange bias with BiFeO3 thin films

abstract:
  We demonstrate a direct correlation between the domain structure of
multiferroic BiFeO3 thin films and exchange bias of Co0.9Fe0.1/BiFeO3
heterostructures. Two distinct types of interactions, an enhancement of the
coercive field (exchange enhancement) and an enhancement of the coercive field
combined with large shifts of the hysteresis loop (exchange bias), have been
observed in these heterostructures, which depend directly on the type and
crystallography of the nanoscale (2 nm) domain walls in the BiFeO3 film. We
show that the magnitude of the exchange bias interaction scales with the length
of 109 degree ferroelectric domain walls in the BiFeO3 thin films which have
been probed via piezoresponse force microscopy and x-ray magnetic circular
dichroism.


title:
Ultrafast Optical-Pump Terahertz-Probe Spectroscopy of the Carrier
  Relaxation and Recombination Dynamics in Epitaxial Graphene

abstract:
  The ultrafast relaxation and recombination dynamics of photogenerated
electrons and holes in epitaxial graphene are studied using optical-pump
Terahertz-probe spectroscopy. The conductivity in graphene at Terahertz
frequencies depends on the carrier concentration as well as the carrier
distribution in energy. Time-resolved studies of the conductivity can therefore
be used to probe the dynamics associated with carrier intraband relaxation and
interband recombination. We report the electron-hole recombination times in
epitaxial graphene for the first time. Our results show that carrier cooling
occurs on sub-picosecond time scales and that interband recombination times are
carrier density dependent.


title: On White-box Cryptography and Obfuscation

abstract:
  We study the relationship between obfuscation and white-box cryptography. We
capture the requirements of any white-box primitive using a \emph{White-Box
Property (WBP)} and give some negative/positive results. Loosely speaking, the
WBP is defined for some scheme and a security notion (we call the pair a
\emph{specification}), and implies that w.r.t. the specification, an
obfuscation does not leak any ``useful'' information, even though it may leak
some ``useless'' non-black-box information.
  Our main result is a negative one - for most interesting programs, an
obfuscation (under \emph{any} definition) cannot satisfy the WBP for every
specification in which the program may be present. To do this, we define a
\emph{Universal White-Box Property (UWBP)}, which if satisfied, would imply
that under \emph{whatever} specification we conceive, the WBP is satisfied. We
then show that for every non-approximately-learnable family, there exist
(contrived) specifications for which the WBP (and thus, the UWBP) fails.
  On the positive side, we show that there exists an obfuscator for a
non-approximately-learnable family that achieves the WBP for a certain
specification. Furthermore, there exists an obfuscator for a non-learnable (but
approximately-learnable) family that achieves the UWBP.
  Our results can also be viewed as formalizing the distinction between
``useful'' and ``useless'' non-black-box information.


title: Reversible linear differential equations

abstract:
  Let $\nabla$ be a meromorphic connection on a vector bundle over a compact
Riemann surface $\Gamma$. An automorphism $\sigma:\Gamma\to\Gamma$ is called a
symmetry of $\nabla$ if the pull-back bundle and the pull-back connection can
be identified with $\nabla$. We study the symmetries by means of what we call
the Fano Group; and, under the hypothesis that $\nabla$ has a unimodular
reductive Galois group, we relate the differential Galois group, the Fano group
and the symmetries by means of an exact sequence.


title: The w-index: A significant improvement of the h-index

abstract:
  I propose a new measure, the w-index, as a particularly simple and useful way
to assess the integrated impact of a researcher's work, especially his or her
excellent papers. The w-index can be defined as follows: If w of a researcher's
papers have at least 10w citations each and the other papers have fewer than
10(w+1) citations, his/her w-index is w. It is a significant improvement of the
h-index.


title: On the sl(2) foam cohomology computations

abstract:
  We show how to use Bar-Natan's `divide and conquer' approach to computations
to efficiently compute the universal sl(2) dotted foam cohomology groups, even
for big knots and links. We also describe a purely topological version of the
sl(2) foam theory, in the sense that no dots are needed on foams.


title: Natural Neutrino Masses and Mixings from Warped Geometry

abstract:
  We demonstrate that flavor symmetries in warped geometry can provide a
natural explanation for large mixing angles and economically explain the
distinction between the quark and lepton flavor sectors. We show how to
naturally generate Majorana neutrino masses assuming a gauged a U(1)_{B-L}
symmetry broken in the UV that generates see-saw masses of the right size. This
model requires lepton minimal flavor violation (LMFV) in which only Yukawa
matrices (present on the IR brane) break the flavor symmetries. The
symmetry-breaking is transmitted to charged lepton bulk mass parameters as well
to generate the hierarchy of charged lepton masses. With LMFV, a GIM-like
mechanism prevents dangerous flavor-changing processes for charged leptons and
permits flavor-changing processes only in the presence of the neutrino Yukawa
interaction and are therefore suppressed when the overall scale for the
neutrino Yukawa matrix is slightly smaller than one in units of the curvature.
In this case the theory can be consistent with a cutoff of 10 TeV and 3 TeV
Kaluza-Klein masses.


title: Super-tetrahedra and super-algebras

abstract:
  In this paper we give a detailed classification scheme for three-dimensional
quantum zero curvature representation and tetrahedron equations. This scheme
includes both even and odd parity components, the resulting algebras of
observables are either Bose q-oscillators or Fermi oscillators.
Three-dimensional $R$-matrices intertwining variously oriented tensor products
of Bose and Fermi oscillators and satisfying tetrahedron and super-tetrahedron
equations are derived. The 3d->2d compactification reproduces U_q(gl(n|m))
super-algebras and their representation theory.


title: Labeled Trees and Localized Automorphisms of the Cuntz Algebras

abstract:
  We initiate a detailed and systematic study of automorphisms of the Cuntz
algebras $\O_n$ which preserve both the diagonal and the core $UHF$-subalgebra.
A general criterion of invertibility of endomorphisms yielding such
automorphisms is given. Combinatorial investigations of endomorphisms related
to permutation matrices are presented. Key objects entering this analysis are
labeled rooted trees equipped with additional data. Our analysis provides
insight into the structure of ${\rm Aut}(\O_n)$ and leads to numerous new
examples. In particular, we completely classify all such automorphisms of
${\mathcal O}_2$ for the permutation unitaries in $\otimes^4 M_2$. We show that
the subgroup of ${\rm Out}(\O_2)$ generated by these automorphisms contains a
copy of the infinite dihedral group ${\mathbb Z} \rtimes {\mathbb Z}_2$.


title: Computing the Jones index of quadratic permutation endomorphisms of O_2

abstract:
  We compute the index of the inclusions of type $III_{1/2}$ factors arising
from endomorphisms of the Cuntz algebra ${\mathcal O}_2$ associated to the
rank-two permutation matrices.


title: Heavy Ion Physics Prospects with the ATLAS Detector at the LHC

abstract:
  The next great energy frontier in Relativistic Heavy Ion Collisions is
quickly approaching with the completion of the Large Hadron Collider and the
ATLAS experiment is poised to make important contributions in understanding QCD
matter at extreme conditions. While designed for high-pT measurements in
high-energy p+p collisions, the detector is well suited to study many aspects
of heavy ion collisions from bulk phenomena to high-pT and heavy flavor
physics. With its large and finely segmented electromagnetic and hadronic
calorimeters, the ATLAS detector excels in measurements of photons and jets,
observables of great interest at the LHC. In this talk, we highlight the
performance of the ATLAS detector for Pb+Pb collisions at the LHC with special
emphasis on a key feature of the ATLAS physics program: jet and direct photon
measurements.


title: A note on closed isometric embeddings

abstract:
  This note is about a little extension of Nash's embedding theorem in the case
of complete manifolds.


title: Multi-matrix models and emergent geometry

abstract:
  Encouraged by the AdS/CFT correspondence, we study emergent local geometry in
large N multi-matrix models from the perspective of a strong coupling
expansion. By considering various solvable interacting models we show how the
emergence or non-emergence of local geometry at strong coupling is captured by
observables that effectively measure the mass of off-diagonal excitations about
a semiclassical eigenvalue background. We find emergent geometry at strong
coupling in models where a mass term regulates an infrared divergence. We also
show that our notion of emergent geometry can be usefully applied to fuzzy
spheres. Although most of our results are analytic, we have found numerical
input valuable in guiding and checking our results.


title: Induced Entanglement Enhanced by Quantum Criticality

abstract:
  Two qubit entanglement can be induced by a quantum data bus interacting with
them. In this paper, with the quantum spin chain in the transverse field as an
illustration of quantum data bus, we show that such induced entanglement can be
enhanced by the quantum phase transition (QPT) of the quantum data bus. We
consider two external spins simultaneously coupled to a transverse field Ising
chain. By adiabatically eliminating the degrees of the chain, the effective
coupling between these two spins are obtained. The matrix elements of the
effective Hamiltonian are expressed in terms of dynamical structure factor
(DSF) of the chain. The DSF is the Fourier transformation of the Green function
of Ising chain and can be calculated numerically by a method introduced in [O.
Derzhko, T. Krokhmalskii, Phys. Rev. B \textbf{56}, 11659 (1997)]. Since all
characteristics of QPT are embodied in the DSF, the dynamical evolution of the
two external spins displays singularity in the vicinity of the critical point.


title: Initial Conditions for Vector Inflation

abstract:
  Recently, a model of inflation using non-minimally coupled massive vector
fields has been proposed. For a particular choice of non-minimal coupling
parameter and for a flat FRW model, the model is reduced to the model of
chaotic inflation with massive scalar field. We study the effect of non-zero
curvature of the universe on the onset of vector inflation. We find that in a
curved universe the dynamics of vector inflation can be different from chaotic
inflation, and the fraction of the initial conditions leading to inflationary
solutions is reduced compared with the chaotic inflation case.


title: Topological aspect of disclinations in two-dimensional melting

abstract:
  By using topological current theory, we study the inner topological structure
of disclinations during the melting of two-dimensional systems. From
two-dimensional elasticity theory, it is found topological currents for
topological defects in homogeneous equation. The evolution of disclinations is
studied, and the branch conditions for generating, annihilating, crossing,
splitting, and merging of disclinations are given.


title: Numerical Computations for Backward Doubly SDEs and SPDEs

abstract:
  In this paper we present two numerical schemes of approximating solutions of
backward doubly stochastic differential equations (BDSDEs for short). We give a
method to discretize a BDSDE. And we also give the proof of the convergence of
these two kinds of solutions for BDSDEs respectively. We give a sample of
computation of BDSDEs.


title: Chemical Abundances in 35 Metal-Poor Stars. I. Basic Data

abstract:
  We carried out a homogeneous abundance study for various elements, including
$\alpha$-elements, iron peak elements and $n$-capture elements for 35
metal-poor stars with a wide metallicity range
($-3.0\lesssim$[Fe/H]$\lesssim-0.5$). High-resolution ($R\simeq30$k), high
signal-to-noise($S/N\geq110$) spectra with a wavelength range of 3800 to 10500
\AA using the Bohyunsan Optical Echelle Spectrograph (BOES). Equivalent widths
were measured by means of the Gaussian-fitting method for numerous isolated
weak lines of elements. Atmospheric parameters were determined by a
self-consistent LTE analysis technique using Fe I and Fe II lines. In this
study, we present the EWs of lines and atmospheric parameters for 35 metal-poor
stars.


title: Broad-line region size and black hole mass in high-z AGN

abstract:
  In this contribution we briefly review the reverberation mapping technique
and its results for low and intermidiate luminosity AGNs. Then we present a
monitoring campaign of high-luminosity high-redshift quasars which will extend
these results by two orders of magnitude, probing the broad-line region size
and black hole (BH) mass of luminous AGN at redshift ~2-3.


title: On Secure Distributed Implementations of Dynamic Access Control

abstract:
  Distributed implementations of access control abound in distributed storage
protocols. While such implementations are often accompanied by informal
justifications of their correctness, our formal analysis reveals that their
correctness can be tricky. In particular, we discover several subtleties in a
standard protocol based on capabilities, that can break security under a simple
specification of access control. At the same time, we show a sensible
refinement of the specification for which a secure implementation of access
control is possible. Our models and proofs are formalized in the applied pi
calculus, following some new techniques that may be of independent interest.
Finally, we indicate how our principles can be applied to securely distribute
other state machines.


title:
Global regularity of wave maps III. Large energy from $\R^{1+2}$ to
  hyperbolic spaces

abstract:
  We show that wave maps $\phi$ from two-dimensional Minkowski space $\R^{1+2}$
to hyperbolic spaces $\H^m$ are globally smooth in time if the initial data is
smooth, conditionally on some reasonable claims concerning the local theory of
such wave maps, as well as the self-similar and travelling (or stationary
solutions); we will address these claims in the sequels \cite{tao:heatwave2},
\cite{tao:heatwave3}, \cite{tao:heatwave4} to this paper. Following recent work
in critical dispersive equations, the strategy is to reduce matters to the
study of an \emph{almost periodic} maximal Cauchy development in the energy
class. We then repeatedly analyse the stress-energy tensor of this development
(as in \cite{tao:forges}) to extract either a self-similar, travelling, or
degenerate non-trivial energy class solution to the wave maps equation. We will
then rule out such solutions in the sequels to this paper, establishing the
desired global regularity result for wave maps.


title: The Quirky Collider Signals of Folded Supersymmetry

abstract:
  We investigate the collider signals associated with scalar quirks ("squirks")
in folded supersymmetric models. As opposed to regular superpartners in
supersymmetric models these particles are uncolored, but are instead charged
under a new confining group, leading to radically different collider signals.
Due to the new strong dynamics, squirks that are pair produced do not hadronize
separately, but rather form a highly excited bound state. The excited
``squirkonium'' loses energy to radiation before annihilating back into
Standard Model particles. We calculate the branching fractions into various
channels for this process, which is prompt on collider time-scales. The most
promising annihilation channel for discovery is W+photon which dominates for
squirkonium near its ground state. We demonstrate the feasibility of the LHC
search, showing that the mass peak is visible above the SM continuum background
and estimate the discovery reach.


title:
A brief comment on the chemical formulae of the rare earth iron arsenide
  oxide superconductors

abstract:
  Just a brief comment on the chemical formulae of the rare earth iron arsenide
oxide superconductors


title: Multiband effects on the conductivity for a multiband Hubbard model

abstract:
  The newly discovered iron-based superconductors have attracted lots of
interests, and the corresponding theoretical studies suggest that the system
should have six bands. In this paper, we study the multiband effects on the
conductivity based on the exact solutions of one-dimensional two-band Hubbard
model. We find that the orbital degree of freedom might enhance the critical
value $U_c$ of on-site interaction of the transition from a metal to an
insulator. This observation is helpful to understand why undoped High-$T_c$
superconductors are usually insulators, while recently discovered iron-based
superconductors are metal. Our results imply that the orbital degree of freedom
in the latter cases might play an essential role.


title:
Electronic structure of new quaternary superconductors LaONiBi and
  LaOCuBi from first principles

abstract:
  Based on first-principles FLAPW-GGA calculations, we have investigated the
electronic structure of newly synthesized novel superconductors LaONiBi and
LaOCuBi, the first bismuth-containing compounds from the family of quaternary
oxypnictides which attract now a great deal of interest in search for novel
26-55K superconductors. The band structure, density of states and Fermi
surfaces are discussed. Our results indicate that the bonding inside of the
(La-O) and (Ni(Cu)-Bi) layers is covalent whereas the bonding between the
(La-O) and (Ni(Cu)- Bi) blocks is mostly ionic. For both oxybismuthides, the
DOSs at the Fermi level are formed mainly by the states of the (Ni(Cu)-Bi)
layers, the corresponding Fermi surfaces have a twodimensional character and
the conduction should be strongly anisotropic andhappen only on the (Ni(Cu)-Bi)
layers. As a whole, the new oxybismuthides may be described as low-TC
superconducting non-magnetic ionic metals.


abstract:
  Critical phenomena in globally coupled excitable elements are studied by
focusing on a saddle-node bifurcation at the collective level. Critical
exponents that characterize divergent fluctuations of interspike intervals near
the bifurcation are calculated theoretically. The calculated values appear to
be in good agreement with those determined by numerical experiments. The
relevance of our results to jamming transitions is also mentioned.


title: Precision measurements of positronium decay rate and energy level

abstract:
  Positronium is an ideal system for the research of the bound state QED. New
precise measurement of orthopositronium decay rate has been performed with an
accuracy of 150 ppm, and the result combined with the last three is 7.0401 +-
0.0007 mu s^-1. It is the first result to validate the 2nd order correction.
The Hyper Fine Splitting of positronium is sensitive to the higher order
corrections of the QED prediction and also to the new physics beyond Standard
Model via the quantum oscillation into virtual photon. The discrepancy of 3.5
sigma is found recently between the measured values and the QED prediction
(O(alpha^3)). It might be due to the contribution of the new physics or the
systematic problems in the previous measurements: (non-thermalized Ps and
non-uniformity of the magnetic field). We propose new methods to measure HFS
precisely without the these uncertainties.


title: GaAs Microcavity Exciton-Polaritons in a Trap

abstract:
  We present a simple method to create an in-plane lateral potential in a
semiconductor microcavity using a metal thin-film. Two types of potential are
produced: a circular aperture and a one-dimensional (1D) periodic grating
pattern. The amplitude of the potential induced by a 24 nm-6 nm Au/Ti film is
on the order of a few hundreds of ueV measured at 6 ~ 8 K. Since the metal
layer makes the electromagnetic fields to be close to zero at the
metal-semiconductor interface, the photon mode is confined more inside of the
cavity. As a consequence, the effective cavity length is reduced under the
metal film, and the corresponding cavity resonance is blue-shifted. Our
experimental results are in a good agreement with theoretical estimates. In
addition, by applying a DC electric voltage to the metal film, we are able to
modify the quantum well exciton mode due to the quantum confined Stark effect,
inducing a ~ 1 meV potential at ~ 20 kV/cm. Our method produces a controllable
in-plane spatial trap potential for lower exciton-polaritons (LPs), which can
be a building block towards 1D arrays and 2D lattices of LP condensates.


title:
Self-consistent Spectral Function for Non-Degenerate Coulomb Systems and
  Analytic Scaling Behaviour

abstract:
  Novel results for the self-consistent single-particle spectral function and
self-energy are presented for non-degenerate one-component Coulomb systems at
various densities and temperatures. The GW^0-method for the dynamical
self-energy is used to include many-particle correlations beyond the
quasi-particle approximation. The self-energy is analysed over a broad range of
densities and temperatures (n=10^17/cm^3-10^27/cm^3, T=10^2 eV/k_B-10^4
eV/k_B). The spectral function shows a systematic behaviour, which is
determined by collective plasma modes at small wavenumbers and converges
towards a quasi-particle resonance at higher wavenumbers. In the low density
limit, the numerical results comply with an analytic scaling law that is
presented for the first time. It predicts a power-law behaviour of the
imaginary part of the self-energy, Im Sigma ~ -n^(1/4). This resolves a long
time problem of the quasi-particle approximation which yields a finite
self-energy at vanishing density.


title: Self-adjointness via partial Hardy-like inequalities

abstract:
  Distinguished selfadjoint extensions of operators which are not semibounded
can be deduced from the positivity of the Schur Complement (as a quadratic
form). In practical applications this amounts to proving a Hardy-like
inequality. Particular cases are Dirac-Coulomb operators where distinguished
selfadjoint extensions are obtained for the optimal range of coupling
constants.


title: Backward SDEs with constrained jumps and quasi-variational inequalities

abstract:
  We consider a class of backward stochastic differential equations (BSDEs)
driven by Brownian motion and Poisson random measure, and subject to
constraints on the jump component. We prove the existence and uniqueness of the
minimal solution for the BSDEs by using a penalization approach. Moreover, we
show that under mild conditions the minimal solutions to these constrained
BSDEs can be characterized as the unique viscosity solution of
quasi-variational inequalities (QVIs), which leads to a probabilistic
representation for solutions to QVIs. Such a representation in particular gives
a new stochastic formula for value functions of a class of impulse control
problems. As a direct consequence, this suggests a numerical scheme for the
solution of such QVIs via the simulation of the penalized BSDEs.


title: Meson-baryon threshold effects in the light-quark baryon spectrum

abstract:
  We argue that selected $S$ wave meson-baryon channels may play a key role to
match poor baryon mass predictions from quark models with data. The
identification of these channels with effective inelastic channels in data
analysis allows to derive a prescription which could improve the extraction and
identification of baryon resonances.


title:
Quantum symmetries for exceptional SU(4) modular invariants associated
  with conformal embeddings

abstract:
  Three exceptional modular invariants of SU(4) exist at levels 4, 6 and 8.
They can be obtained from appropriate conformal embeddings and the
corresponding graphs have self-fusion. From these embeddings, or from their
associated modular invariants, we determine the algebras of quantum symmetries,
obtain their generators, and, as a by-product, recover the known graphs
E4(SU4), E6(SU4) and E8(SU4) describing exceptional quantum subgroups of type
SU(4). We also obtain characteristic numbers (quantum cardinalities,
dimensions) for each of them and for their associated quantum groupoids.


title: Minimizing the Number of Tiles in a Tiled Rectangle

abstract:
  In this paper, we prove that if a finite number of rectangles, every of which
has at least one integer side, perfectly tile a big rectangle then there exists
a strategy which reduces the number of these tiles (rectangles) without
violating the condition on the borders of the tiles. Consequently this strategy
leads to yet another solution to the famous rectangle tiling theorem.


title:
Telex: Principled System Support for Write-Sharing in Collaborative
  Applications

abstract:
  The Telex system is designed for sharing mutable data in a distributed
environment, particularly for collaborative applications. Users operate on
their local, persistent replica of shared documents; they can work disconnected
and suffer no network latency. The Telex approach to detect and correct
conflicts is application independent, based on an action-constraint graph (ACG)
that summarises the concurrency semantics of applications. The ACG is stored
efficiently in a multilog structure that eliminates contention and is optimised
for locality. Telex supports multiple applications and multi-document updates.
The Telex system clearly separates system logic (which includes replication,
views, undo, security, consistency, conflicts, and commitment) from application
logic. An example application is a shared calendar for managing multi-user
meetings; the system detects meeting conflicts and resolves them consistently.


title:
Stability of Fock states in a two-component Bose-Einstein condensate
  with a regular classical counterpart

abstract:
  We study the stability of a two-component Bose-Einstein condensate (BEC) in
the parameter regime in which its classical counterpart has regular motion. The
stability is characterized by the fidelity for both the same and different
initial states. We study as initial states the Fock states with definite
numbers of atoms in each component of the BEC. It is found that for some
initial times the two Fock states with all the atoms in the same component of
the BEC are stabler than Fock states with atoms distributed in the two
components. An experimental scheme is discussed, in which the fidelity can be
measured in a direct way.


title:
Averages of Euler products, distribution of singular series and the
  ubiquity of Poisson distribution

abstract:
  We discuss in some detail the general problem of computing averages of
convergent Euler products, and apply this to examples arising from singular
series for the $k$-tuple conjecture and more general problems of polynomial
representation of primes. We show that the singular series for the $k$-tuple
conjecture have a limiting distribution when taken over $k$-tuples with
(distinct) entries of growing size, and observe that its moments have a curious
symmetry property. We also give conditional arguments that would imply that the
number of twin primes (or more general polynomial prime patterns) in suitable
short intervals are asymptotically Poisson distributed.


title: 4D N = 2 Supergravity and Projective Superspace

abstract:
  This paper presents a projective superspace formulation for 4D N = 2
matter-coupled supergravity. We first describe a variant superspace realization
for the N = 2 Weyl multiplet. It differs from that proposed by Howe in 1982 by
the choice of the structure group (SO(3,1) x SU(2) versus SO(3,1) x U(2)),
which implies that the super-Weyl transformations are generated by a
covariantly chiral parameter instead of a real unconstrained one. We introduce
various off-shell supermultiplets which are curved superspace analogues of the
superconformal projective multiplets in global supersymmetry and which describe
matter fields coupled to supergravity. A manifestly locally supersymmetric and
super-Weyl invariant action principle is given. Off-shell locally
supersymmetric nonlinear sigma models are presented in this new superspace.


title:
Ground-state properties of fermionic mixtures with mass imbalance in
  optical lattices

abstract:
  Ground-state properties of fermionic mixtures confined in a one-dimensional
optical lattice are studied numerically within the spinless Falicov-Kimball
model with a harmonic trap. A number of remarkable results are found. (i) At
low particle filling the system exhibits the phase separation with heavy atoms
in the center of the trap and light atoms in the surrounding regions. (ii)
Mott-insulating phases always coexist with metallic phases. (iii)
Atomic-density waves are observed in the insulating regions for all particle
fillings near half-filled lattice case. (iv) The variance of the local density
exhibits the universal behavior (independent of the particle filling, the
Coulomb interaction and the strength of a confining potential) over the whole
region of the local density values.


title:
Low-density limit as a test for the models of complicated processes in
  the nuclei

abstract:
  We propose to use the branching ratio of channels of free-space
hadron-nucleon interaction as a test in the construction and verification of
the models of complicated processes in the nuclei. The particle self-energy and
amplitudes of subprocesses are studied as well.


title: Lagrangian conformal higher spin theory

abstract:
  In a previous paper conformal gravity was derived by means of a precise
action principle on the hypercone in the conformal space. Here it is shown that
the same technique used to construct conformal spin two theory as represented
by linear conformal gravity may also be used for the construction of conformal
higher spin theories. The basic ingredients in these constructions are gauge
invariant field strengths (curvatures). In fact, their very existence as
manifestly conformal fields requires the present conformal theory. The general
form of the actions for the free theories on the hypercone are given. In
spacetime these actions are shown to be expressed in terms of squares of
generalized Weyl tensors. Conformal spin three and four are calculated
explicitly. The theories are proposed to be equivalent to the free theories
given by Fradkin and Linetsky. Since the equations are of order 2s a consistent
quantization is difficult to achieve but might exist. Interactions are expected
to exist and is the motivation behind this approach.


title: Les deux quadrangulations infinies uniformes ont m\^eme loi

abstract:
  We prove that the uniform infinite random quadrangulations introduced
respectively by Chassaing-Durhuus and Krikun have the same distribution.


title:
A high-precision variational approach to three- and four-nucleon bound
  and zero-energy scattering states

abstract:
  The hyperspherical harmonic (HH) method has been widely applied in recent
times to the study of the bound states, using the Rayleigh-Ritz variational
principle, and of low-energy scattering processes, using the Kohn variational
principle, of A=3 and 4 nuclear systems. When the wave function of the system
is expanded over a sufficiently large set of HH basis functions, containing or
not correlation factors, quite accurate results can be obtained for the
observables of interest. In this paper, the main aspects of the method are
discussed together with its application to the A=3 and 4 nuclear bound and
zero-energy scattering states. Results for a variety of nucleon-nucleon (NN)
and three-nucleon (3N) local or non-local interactions are reported. In
particular, NN and 3N interactions derived in the framework of the chiral
effective field theory and NN potentials from which the high momentum
components have been removed, as recently presented in the literature, are
considered for the first time within the context of the HH method. The purpose
of this paper is two-fold. First, to present a complete description of the HH
method for bound and scattering states, including also detailed formulas for
the computation of the matrix elements of the NN and 3N interactions. Second,
to report accurate results for bound and zero-energy scattering states obtained
with the most commonly used interaction models. These results can be useful for
comparison with those obtained by other techniques and are a significant test
for different future approaches to such problems.


title: A point counting algorithm using cohomology with compact support

abstract:
  We describe an algorithm to count the number of rational points of an
hyperelliptic curve defined over a finite field of odd characteristic which is
based upon the computation of the action of the Frobenius morphism on a basis
of the Monsky-Washnitzer cohomology with compact support. This algorithm
follows the vein of a systematic exploration of potential applications of
cohomology theories to point counting.
  Our algorithm decomposes in two steps. A first step which consists in the
computation of a basis of the cohomology and then a second step to obtain a
representation of the Frobenius morphism. We achieve a $\tilde{O}(g^4 n^{3})$
worst case time complexity and $O(g^3 n^3)$ memory complexity where $g$ is the
genus of the curve and $n$ is the absolute degree of its base field. We give a
detailed complexity analysis of the algorithm as well as a proof of
correctness.


title: QGP Susceptibilities from PNJL Model

abstract:
  An improved version of the PNJL model is used to calculate various
thermodynamical quantities, {\it viz.}, quark number susceptibility, isospin
susceptibility, specific heat, speed of sound and conformal measure. Comparison
with Lattice data is found to be encouraging.


title:
Experimental study of nonlinear dust acoustic solitary waves in a dusty
  plasma

abstract:
  The excitation and propagation of finite amplitude low frequency solitary
waves are investigated in an Argon plasma impregnated with kaolin dust
particles. A nonlinear longitudinal dust acoustic solitary wave is excited by
pulse modulating the discharge voltage with a negative potential. It is found
that the velocity of the solitary wave increases and the width decreases with
the increase of the modulating voltage, but the product of the solitary wave
amplitude and the square of the width remains nearly constant. The experimental
findings are compared with analytic soliton solutions of a model Kortweg-de
Vries equation.


title:
Matrix genetics, part 3: the evolution of the genetic code from the
  viewpoint of the genetic octave Yin-Yang-algebra

abstract:
  The set of known dialects of the genetic code (GC) is analyzed from the
viewpoint of the genetic octave Yin-Yang-algebra. This algebra was described in
the previous author's publications. The algebra was discovered on the basis of
structural features of the GC in the matrix form of its presentation ("matrix
genetics"). The octave Yin-Yang-algebra is considered as the pre-code or as the
model of the GC. From the viewpoint of this algebraic model, for example, the
sets of 20 amino acids and of 64 triplets consist of sub-sets of "male",
"female" and "androgynous" molecules, etc. This algebra permits to reveal
hidden peculiarities of the structure and evolution of the GC and to propose
the conception of "sexual" relationships among genetic molecules. The first
results of the analysis of the GC systems from such algebraic viewpoint say
about the close connection between evolution of the GC and this algebra. They
include 8 evolutionary rules of the dialects of the GC. The evolution of the GC
is appeared as the struggle between male and female beginnings. The hypothesis
about new biophysical factor of "sexual" interactions among genetic molecules
is put forward. The matrix forms of presentation of elements of the genetic
octave Yin-Yang-algebra are connected with Hadamard matrices by means of the
simple U-algorithm. Hadamard matrices play a significant role in the theory of
quantum computers, in particular. It gives new opportunities for possible
understanding the GC systems as quantum computer systems. Revealed algebraic
properties of the GC permit to put forward the problem of algebraization of
bioinformatics on the basis of the algebras of the GC. Our investigation is
connected with the question: what is life from the viewpoint of algebra? The
algebraic version of the origin of the GC is discussed.


title: Universal spreading of wavepackets in disordered nonlinear systems

abstract:
  In the absence of nonlinearity all eigenmodes of a chain with disorder are
spatially localized (Anderson localization). The width of the eigenvalue
spectrum, and the average eigenvalue spacing inside the localization volume,
set two frequency scales. An initially localized wavepacket spreads in the
presence of nonlinearity. Nonlinearity introduces frequency shifts, which
define three different evolution outcomes: i) localization as a transient, with
subsequent subdiffusion; ii) the absence of the transient, and immediate
subdiffusion; iii) selftrapping of a part of the packet, and subdiffusion of
the remainder. The subdiffusive spreading is due to a finite number of packet
modes being resonant. This number does not change on average, and depends only
on the disorder strength. Spreading is due to corresponding weak chaos inside
the packet, which slowly heats the cold exterior. The second moment of the
packet is increasing as $t^{\alpha}$. We find $\alpha=1/3$.


title: Poisson (co)homology of truncated polynomial algebras in two variables

abstract:
  We study the Poisson (co)homology of the algebra of truncated polynomials in
two variables viewed as the semi-classical limit of a quantum complete
intersection studied by Bergh and Erdmann. We show in particular that the
Poisson cohomology ring of such a Poisson algebra is isomorphic to the
Hochschild cohomology ring of the corresponding quantum complete intersection.


title:
Charmless Two-body $B(B_s)\to PP,VP$ decays In
  Soft-Collinear-Effective-Theory

abstract:
  We analyze the charmless two-body $B\to VP$ decays in the
soft-collinear-effective-theory (SCET), where $V(P)$ denotes a light vector
(pseudoscalar) meson. Using the current experimental data, we find two
solutions in $\chi^2$ fit for the 16 non-perturbative inputs responsible for
the 87 $B\to PP$ and $B\to VP$ decay channels in SU(3) symmetry. Chirally
enhanced penguins can only change several charming penguins sizably, since they
share the same topology. The (S-P)(S+P) annihilation penguins in the
perturbative QCD approach have the same topology with charming penguins in
SCET, which play an important role in direct CP asymmetries.


title: Regularization and finiteness of the Lorentzian LQG vertices

abstract:
  We give an explicit form for the Lorentzian vertices recently introduced for
possibly defining the dynamics of loop quantum gravity. As a result of so
doing, a natural regularization of the vertices is suggested. The regularized
vertices are then proven to be finite. An interpretation of the regularization
in terms of a gauge-fixing is also given.


title: Deep inside low-mass stars

abstract:
  Low-mass stars exhibit, at all stages of their evolution, the signatures of
complex physical processes that require challenging modeling beyond standard
stellar theory. In this review, we recall the most striking observational
evidences that probe the interaction and interdependence of various transport
processes of chemicals and angular momentum in these objects. We then focus on
the impact of atomic diffusion, large scale mixing due to rotation, and
internal gravity waves on stellar properties on the main sequence and slightly
beyond.


title:
Outliers from the mainstream: how a massive star can produce a gamma-ray
  burst

abstract:
  It is now recognized that long-duration Gamma-Ray Bursts (GRBs) are linked to
the collapse of massive stars, based on the association between (low-redshift)
GRBs and (type Ic) core-collapse supernovae (SNe). The census of massive stars
and GRBs reveals, however, that not all massive stars do produce a GRB. Only
~1% of core collapse SNe are able to produce a highly relativistic collimated
outflow, and hence a GRB. The extra crucial parameter has long been suspected
to be metallicity and/or rotation. We find observational evidence strongly
supporting that both ingredients are necessary in order to make a GRB out of a
core-collapsing star. A detailed study of the absorption pattern in the X-ray
spectrum of GRB060218 reveals evidence of material highly enriched in low
atomic number metals ejected before the SN/GRB explosion. We find that, within
the current scenarios of stellar evolution, only a progenitor star
characterized by a fast stellar rotation and sub-solar initial metallicity
could produce such a metal enrichment in its close surrounding.


title: Stable Sarma State in Two-band Fermi Systems

abstract:
  We investigate fermionic superconductivity with mismatched Fermi surfaces in
a general two-band system. The exchange interaction between the two bands
changes significantly the stability structure of the pairing states. The Sarma
state with two gapless Fermi surfaces which is always unstable in single-band
systems, can be the stable ground state in two-band systems. To realize a
visible mismatch window for the stable Sarma state, two conditions should be
satisfied: a nonzero inter-band exchange interaction and a large asymmetry
between the two bands.


title:
How Many CVs are Crossing the Period Gap? A Test for the Disruption of
  Magnetic Braking

abstract:
  We apply population synthesis techniques to calculate the present day number
of two types of white dwarf-main sequence star (WDMS) binaries within the
cataclysmic variable period gap. The first are post-common envelope binaries
with secondary stars that have masses between 0.17 and 0.36 Msun (gPCEBs), such
that they will commence mass transfer within the period gap. The second type
are systems that were CVs at some point in their past, but detached once they
evolved down in orbital period to ~3 h as a consequence of disrupted magnetic
braking, and are crossing the period gap via gravitational radiation (dCVs).
Full population synthesis calculations are performed where we assume either
constant, global values of the common envelope ejection efficiency, or consider
the ejection efficiency as a function of secondary mass. Several forms of
magnetic braking are also considered. We predict an excess of dCVs over gPCEBs
within the period gap of ~4 to ~13 assuming an ejection efficiency between 0.1
and 0.6, and a flat initial mass ratio distribution. This excess is revealed as
a prominent peak at the location of the period gap in the orbital period
distribution of the combined gPCEB and dCV population. We suggest that if such
a feature is observed in the orbital period distribution of an observed sample
of short orbital period WDMS binaries, this would strongly corroborate the
disruption of magnetic braking.


title: Restricted centrosymmetric permutations

abstract:
  The paper was withdrawn because of its significant overlap with a paper
appeared recently.


title:
Pairing within the self-consistent quasiparticle random-phase
  approximation at finite temperature

abstract:
  An approach to pairing in finite nuclei at nonzero temperature is proposed,
which incorporates the effects due to the quasiparticle-number fluctuation
(QNF) around Bardeen-Cooper-Schrieffer (BCS) mean field and dynamic coupling to
quasiparticle-pair vibrations within the self-consistent quasiparticle
random-phase approximation (SCQRPA). The numerical calculations of pairing gap,
total energy, and heat capacity were carried out within a doubly folded
multilevel model as well as realistic nuclei $^{56}$Fe and $^{120}$Sn. The
results obtained show that, under the effect of QNF, in the region of moderate
and strong couplings, the sharp transition between the superconducting and
normal phases is smoothed out, resulting in a thermal pairing gap, which does
not collapse at the BCS critical temperature, but has a tail, which extends to
high temperature. The dynamic coupling of quasiparticles to SCQRPA vibrations
significantly improves the agreement with the results of exact calculations and
those obtained within the finite-temperature quantal Monte Carlo method for the
total energy and heat capacity. It also causes a deviation of the quasiparticle
occupation numbers from the Fermi-Dirac distributions for free fermions.


title: The "footprints'' of irreversibility

abstract:
  We reformulate the result for the entropy production given in Phys. Rev.
Lett. 98, 080602 (2007) in terms of the relative entropy of microscopic
trajectories. By a combination with the Crook's theorem, we identify the path
variables that are sufficient to fully identify irreversibility. We show that
work saturates the relative entropy, and derive the entropy production for
stochastic descriptions.


title: Denseness of certain smooth L\'evy functionals in $\DD_{1,2}$

abstract:
  The Malliavin derivative for a L\'evy process $(X_t)$ can be defined on the
space $\DD_{1,2}$ using a chaos expansion or in the case of a pure jump process
also via an increment quotient operator \cite{sole-utzet-vives}. In this paper
we define the Malliavin derivative operator $\D$ on the class $\mathcal{S}$ of
smooth random variables $f(X_{t_1}, ..., X_{t_n}),$ where $f$ is a smooth
function with compact support. We show that the closure of $L_2(\Om) \supseteq
\mathcal{S} \stackrel{\D}{\to} L_2(\m\otimes \mass)$ yields to the space
$\DD_{1,2}.$ As an application we conclude that Lipschitz functions map from
$\DD_{1,2}$ into $\DD_{1,2}.$


title: The CRESST-II Experiment

abstract:
  The CRESST-II experiment is introduced. It uses scintillating crystals as a
target to search for elastic scatterings of dark matter particles. The
detectors are operated in a dilution cryostat at temperatures below 30mK, and
for each particle interaction, the phonon signal as well as the scintillation
light signal are recorded. Recent results from a commissioning run following a
major upgrade are presented. The current limit that can be placed on the
spin-independent WIMP-nucleon scattering cross-section is below 6x10-7 pb for
WIMPs in the mass range from about 40 to 90 GeV/c2.


title: The crossing number of composite knots

abstract:
  It is a very old conjecture that the crossing number of knots is additive
under connected sum. In other words, if K#K' is the connected sum of knots K
and K', then does the equality c(K#K') = c(K) + c(K') hold? We prove that
c(K#K') is at most c(K) + c(K') and at least (c(K) + c(K'))/152.


title: Subspaces with a common complement in a Banach space

abstract:
  We study the problem of the existence of a common algebraic complement for a
pair of closed subspaces of a Banach space. We prove the following two
characterizations: (1) The pairs of subspaces of a Banach space with a common
complement coincide with those pairs which are isomorphic to a pair of graphs
of bounded linear operators between two other Banach spaces. (2) The pairs of
subspaces of a Banach space X with a common complement coincide with those
pairs for which there exists an involution S on X exchanging the two subspaces,
such that I+S is bounded from below on their union. Moreover we show that, in a
separable Hilbert space, the only pairs of subspaces with a common complement
are those which are either equivalently positioned or not completely asymptotic
to one another. We also obtain characterizations for the existence of a common
complement for subspaces with closed sum.


title: Initial State Radiation: A success story

abstract:
  The investigation of events with Initial State Radiation (ISR) and subsequent
Radiative Return has become an impressively successful and guiding tool in low
and intermediate energy hadron physics with electron positron colliders: it
allows to measure hadronic cross sections and the ratio R from threshold up to
the maximum energy of the colliders running at fixed energy, to clarify
reaction mechanisms and reveal substructures (intermediate states and their
decay mechanisms) and to search for new highly excited mesonic states with
J^{PC} = 1^{--}. While being discussed since the sixties-seventies ISR became a
powerful tool for experimentalists only with the development of EVA-PHOKHARA, a
Monte Carlo generator developed over almost 10 years, while increasing its
complexity, which is user friendly, flexible and easy to implement into the
software of existing detectors.


title: Ageing under stress and mechanical fragility of soft solids of laponite

abstract:
  In this work, we investigate the ageing behavior of soft glassy solids of
aqueous suspension of laponite under shear flow. We observe that when an
imposed time is normalized by a dominating relaxation time of the system, the
rheological response at different ages shows superposition. Analysis of this
behavior suggests that the structural evolution with age under a deformation
field, as represented by the dependence of dominant relaxation mode on age,
becomes weaker as the system becomes progressively less homogeneous due to
enhanced attractive interactions caused by addition of salt. Creep-recovery
behavior at same elastic modulus shows more viscous dissipation for a system
having more salt, demonstrating increase in the mechanical fragility. This
study shows that an increase in the concentration of salt, which enhances
attractive interactions and causes greater inhomogeneity, leads to a state
wherein the particles are held together by weaker interactions. This work leads
to important insights into how microstructure affects the ageing dynamics. We
discuss the observed behavior in the context of ageing in colloidal glasses and
gels of aqueous suspension of laponite.

categories: cond-mat.soft cond-mat.dis-nn cond-mat.mtrl-sci cond-mat.stat-mech


title: Generalizations of the Lax-Milgram theorem

abstract:
  We prove a linear and a nonlinear generalization of the Lax-Milgram theorem.
In particular we give sufficient conditions for a real-valued function defined
on the product of a reflexive Banach space and a normed space to represent all
bounded linear functionals of the latter. We also give two applications to
singular differential equations.


title:
Astala's Conjecture on Distortion of Hausdorff Measures under
  Quasiconformal Maps in the Plane

abstract:
  Let E be a compact set in the plane, g be a K-quasiconformal map, and let
0<t<2. Then
  H^t (E) = 0 implies H^{t'} (g E) = 0, for t'=[2Kt]/[2+(K-1)t].
  This is a refinement of a set of inequalities on the distortion of Hausdorff
dimensions by quasiconformal maps proved by K. Astala in his celebrated paper
on area distortion for quasiconformal maps and answers in the positive a
Conjecture of K. Astala in op. cit.


title: Stiffest Elastic Networks

abstract:
  The rigidity of a network of elastic beams crucially depends on the specific
details of its structure. We show both numerically and theoretically that there
is a class of isotropic networks which are stiffer than any other isotropic
network with same density. The elastic moduli of these \textit{stiffest elastic
networks} are explicitly given. They constitute upper-bounds which compete or
improve the well-known Hashin-Shtrikman bounds. We provide a convenient set of
criteria (necessary and sufficient conditions) to identify these networks, and
show that their displacement field under uniform loading conditions is affine
down to the microscopic scale. Finally, examples of such networks with periodic
arrangement are presented, in both two and three dimensions.


title:
Effect of strong correlation on the study of renormalization group flow
  diagram for Kondo effect in a interacting quantum wire

abstract:
  We present the study of Kondo effect in an interacting quantum wire. We
mainly emphasis the effect of strong electronic correlations in the study of
renormalization group flow diagram and the stability analysis of fixed points
for both magnetic and nonmagnetic impurities. We observe that the behavior of
the system is either in the single channel or in the two channel Kondo effect
depending on the initial values of coupling constants and strong correlations.


title: Cohomological tautness for Riemannian foliations

abstract:
  In this paper we present some new results on the tautness of Riemannian
foliations in their historical context. The first part of the paper gives a
short history of the problem. For a closed manifold, the tautness of a
Riemannian foliation can be characterized cohomologically. We extend this
cohomological characterization to a class of foliations which includes the
foliated strata of any singular Riemannian foliation of a closed manifold.


title:
Length-Scale Dependent Superconductor-Insulator Quantum Phase Transition
  in One Dimension

abstract:
  We study the dissipation physics of one dimensional mesoscopic
superconducting quantum interference device array by using the
field-theoretical renormalization group method. We observe length scale
dependent superconductor-insulator quantum phase transition at very low
temperature and also observe the dual behaviour of the system for the higher
and lower values of magnetic field. At a critical magnetic field, we also
observe a critical behaviour where the resistance is independent of length.


title:
On the varieties of representations and characters of a family of
  one-relator subgroups. Their irreducible components

abstract:
  Let us consider the group $G = < x,y \mid x^m = y^n>$ with $m$ and $n$
nonzero integers. In this paper, we study the variety of epresentations $R(G)$
and the character variety $X(G)$ in $SL(2,\C)$ of the group $G$,obtaining by
elementary methods an explicit primary decomposition of the ideal corresponding
to $X(G)$ in the coordinates $X=t_x$, $Y=t_y$ and $Z=t_{xy}$. As an easy
consequence, a formula for computing the number of irreducible components of
$X(G)$ as a function of $m$ and $n$ is given. We provide a combinatorial
description of $X(G)$ and we prove that in most cases it is possible to recover
$(m,n)$ from the combinatorial structure of $X(G)$. Finally we compute the
number of irreducible components of $R(G)$ and study the behavior of the
projection $t:R(G)\longrightarrow X(G)$.


title: Adiabatic Cooper-Pair Pumping in a Linear Array of Cooper Pair Boxes

abstract:
  We present a study of adiabatic Cooper pair pumping in one dimensional array
of Cooper pair boxes. We do a detailed theoretical analysis of an
experimentally realizable stabilized charge pumping scheme in a linear array of
Cooper pair boxes. Our system is subjected to synchronized flux and voltage
fields and travel along a loop which encloses their critical ground state of
the system in the flux-voltage plane. The locking potential in the sine-Gordon
model slides and changes its minimum which yields the Cooper pair pumping. Our
analytical methods are the Berry phase analysis and Abelian bosonization
studies.


title:
Report on article The Travelling Salesman Problem: A Linear Programming
  Formulation

abstract:
  This article describes counter example prepared in order to prove that linear
formulation of TSP problem proposed in [arXiv:0803.4354] is incorrect (it
applies also to QAP problem formulation in [arXiv:0802.4307]). Article refers
not only to model itself, but also to ability of extension of proposed model to
be correct.


title: D-brane Description of New Open String Solutions in AdS(5)

abstract:
  In this paper we find D-brane descriptions of some of new open string
solutions that were found in 0804.3438[hep-th]. These D5-brane and D3-brane
configurations give gravitational dual descriptions of Wilson loops in some
particular representations.


title:
Nanoscale superconducting properties of amorphous W-based deposits grown
  with focused-ion-beam

abstract:
  We present very low temperature Scanning Tunneling Microscopy and
Spectroscopy (STM/S) measurements in W-based amorphous superconducting
nanodeposits grown using a metal-organic precursor and focused-ion-beam. The
superconducting gap closely follows s-wave BCS theory, and STS images under
magnetic fields show a hexagonal vortex lattice whose orientation is related to
features observed in the topography through STM. Our results demonstrate that
the superconducting properties at the surface of these deposits are very
homogeneous, down to atomic scale. This, combined with the huge nanofabrication
possibilities of the focused-ion-beam technique, paves the way to use
focused-ion-beam to make superconducting circuitry of many different
geometries.


title: Hilbert space structure and positive operators

abstract:
  Let X be a real Banach space. We prove that the existence of an injective,
positive, symmetric and not strictly singular operator from X into its dual
implies that either X admits an equivalent Hilbertian norm or it contains a
nontrivially complemented subspace which is isomorphic to a Hilbert space. We
also treat the non-symmetric case.


title: La fiabilit\'e des informations sur le web

abstract:
  Online IR tools have to take into account new phenomena linked to the
appearance of blogs, wiki and other collaborative publications. Among these
collaborative sites, Wikipedia represents a crucial source of information.
However, the quality of this information has been recently questionned. A
better knowledge of the contributors' behaviors should help users navigate
through information whose quality may vary from one source to another. In order
to explore this idea, we present an analysis of the role of different types of
contributors in the control of the publication of conflictual articles.


title: Dynamical symmetries of the Klein-Gordon equation

abstract:
  The dynamical symmetries of the two-dimensional Klein-Gordon equations with
equal scalar and vector potentials (ESVP) are studied. The dynamical symmetries
are considered in the plane and the sphere respectively. The generators of the
SO(3) group corresponding to the Coulomb potential, and the SU(2) group
corresponding to the harmonic oscillator potential are derived. Moreover, the
generators in the sphere construct the Higgs algebra. With the help of the
Casimir operators, the energy levels of the Klein-Gordon systems are yielded
naturally.


title:
Iterative construction of $U_q (s\ell (n+1)) $ representations and Lax
  matrix factorisation

abstract:
  The construction of a generic representation of $g\ell(n+1)$ or of the
trigonomentric deformation of its enveloping algebra known as algebraic
induction is conveniently formulated in term of Lax matrices. The Lax matrix of
the constructed representation factorises into parts determined by the Lax
matrix of a generic representation of the algebra with reduced rank and others
appearing in the factorised expression of the Lax matrix of the special
Jordan-Schwinger representation.


title: Solvable Two-Body Dirac Equation as a Potential Model of Light Mesons

abstract:
  The two-body Dirac equation with general local potential is reduced to the
pair of ordinary second-order differential equations for radial components of a
wave function. The class of linear + Coulomb potentials with complicated
spin-angular structure is found, for which the equation is exactly solvable. On
this ground a relativistic potential model of light mesons is constructed and
the mass spectrum is calculated. It is compared with experimental data.


title:
Generalization of short coherent control pulses: extension to arbitrary
  rotations

abstract:
  We generalize the problem of the coherent control of small quantum systems to
the case where the quantum bit (qubit) is subject to a fully general rotation.
Following the ideas developed in Pasini et al (2008 Phys. Rev. A 77, 032315),
the systematic expansion in the shortness of the pulse is extended to the case
where the pulse acts on the qubit as a general rotation around an axis of
rotation varying in time. The leading and the next-leading corrections are
computed. For certain pulses we prove that the general rotation does not
improve on the simpler rotation with fixed axis.


title: Formation Of A Cold Antihydrogen Beam in AEGIS For Gravity Measurements

abstract:
  The formation of the antihydrogen beam in the AEGIS experiment through the
use of inhomogeneous electric fields is discussed and simulation results
including the geometry of the apparatus and realistic hypothesis about the
antihydrogen initial conditions are shown. The resulting velocity distribution
matches the requirements of the gravity experiment. In particular it is shown
that the inhomogeneous electric fields provide radial cooling of the beam
during the acceleration.


title:
Properties of vertically self-gravitating accretion discs with a
  dissipative corona

abstract:
  The steady-state structure of a disc with a corona is analyzed when the
vertical component of the gravitational force due to the self-gravity of the
disc is considered. For the energy exchange between the disc and the corona, we
assume a fraction f of the dissipated energy inside the accretion disc is
transported to the corona via the magnetic tubes. Analytical solutions
corresponding to a prescription for f (in which this parameter directly depends
on the ratio of the gas pressure to the total pressure) or free f are presented
and their physical properties are studied in detail. We show that the existence
of the corona not only decreases the temperature of the disc, but also
increases the surface density.The vertical component of the gravitational force
due to the self-gravity of the disc decreases the self-gravitating radius and
the mass of the fragments at this radius. However, as more energy is
transported from the disc to the corona, the effect of the vertical component
of the gravitational force due to the self-gravity of the disc on the
self-gravitating radius becomes weaker, though the mass of the fragments is
reduced irrespective of the amount of the energy exchange from the disc to the
corona.


title: Gravitating (field theoretical) cosmic (p,q)-superstrings

abstract:
  We study field theoretical models for cosmic (p,q)-superstrings in a curved
space-time. We discuss both string solutions, i.e. solutions with a conical
deficit, but also so-called Melvin solutions, which have a completely different
asymptotic behaviour. We show that globally regular gravitating (p,q)-strings
exist only in a finite domain of the parameter space and study the dependence
of the domain of existence on the parameters in the model. We find that due to
the interaction between strings, the parameter range where string solution
exist is wider than for non-interacting strings.


title: Superfluidity and vortices: A Ginzburg-Landau model

abstract:
  The paper deals with the study of superfluidity by a Ginzburg-Landau model
that investigates the material by a second order phase transition, in which any
particle has simultaneouly a normal and superfluid motion. This pattern is able
to describe the classical effects of superfluidity as the phase diagram, the
vortices, the second sound and the thermomechanical effect. Finally, the
vorticities and turbulence are described by an extension of the model in which
the material time derivative is used


title: Resolving Curvature Singularities in Holomorphic Gravity

abstract:
  We formulate holomorphic theory of gravity and study how the holomorphy
symmetry alters the two most important singular solutions of general
relativity: black holes and cosmology. We show that typical observers (freely)
falling into a holomorphic black hole do not encounter a curvature singularity.
Likewise, typical observers do not experience Big Bang singularity. Unlike
Hermitian gravity \cite{MantzHermitianGravity}, Holomorphic gravity does not
respect the reciprocity symmetry and thus it is mainly a toy model for a
gravity theory formulated on complex space-times. Yet it is a model that
deserves a closer investigation since in many aspects it resembles Hermitian
gravity and yet calculations are simpler. We have indications that holomorphic
gravity reduces to the laws of general relativity correctly at large distance
scales.


title: The Schur Algorithm in Terms of System Realization

abstract:
  The main goal of this paper is to demonstrate the usefulness of certain ideas
from System Theory in the study of problems from complex analysis. With this
paper, we also aim to encourage analysts, who might not be familiar with System
Theory, colligations or operator models to take a closer look at these topics.
For this reason, we present a short introduction to the necessary background.
The method of system realizations of analytic functions often provides new
insights into and interpretations of results relating to the objects under
consideration. In this paper we will use a well-studied topic from classical
analysis as an example. More precisely, we will look at the classical Schur
algorithm from the perspective of System Theory. We will confine our
considerations to rational inner functions. This will allow us to avoid
questions involving limits and will enable us to concentrate on the algebraic
aspects of the problem at hand. Given a non-negative integer (n), we describe
all system realizations of a given rational inner function of degree (n) in
terms of an appropriately constructed equivalence relation in the set of all
unitary ((n + 1) \times (n + 1) )-matrices. The concept of Redheffer coupling
of colligations gives us the possibility to choose a particular representative
from each equivalence class. The Schur algorithm for a rational inner function
is, consequently, described in terms of the state space representation.


title: Strichartz estimates for the wave equation on manifolds with boundary

abstract:
  We prove certain mixed-norm Strichartz estimates on manifolds with boundary.
Using them we are able to prove new results for the critical and subcritical
wave equation in 4-dimensions with Dirichlet or Neumann boundary conditions. We
obtain global existence in the subcricital case, as well as global existence
for the critical equation with small data. We also can use our Strichartz
estimates to prove scattering results for the critical wave equation with
Dirichlet boundary conditions in 3-dimensions.


title:
The pulsating DA white dwarf star EC 14012-1446: results from four
  epochs of time-resolved photometry

abstract:
  The pulsating DA white dwarfs are the coolest degenerate stars that undergo
self-driven oscillations. Understanding their interior structure will help to
understand the previous evolution of the star. To this end, we report the
analysis of more than 200 h of time-resolved CCD photometry of the pulsating DA
white dwarf star EC 14012-1446 acquired during four observing epochs in three
different years, including a coordinated three-site campaign. A total of 19
independent frequencies in the star's light variations together with 148
combination signals up to fifth order could be detected. We are unable to
obtain the period spacing of the normal modes and therefore a mass estimate of
the star, but we infer a fairly short rotation period of 0.61 +/- 0.03 d,
assuming the rotationally split modes are l=1. The pulsation modes of the star
undergo amplitude and frequency variations, in the sense that modes with higher
radial overtone show more pronounced variability and that amplitude changes are
always accompanied by frequency variations. Most of the second-order
combination frequencies detected have amplitudes that are a function of their
parent mode amplitudes, but we found a few cases of possible resonantly excited
modes. We point out the complications in the analysis and interpretation of
data sets of pulsating white dwarfs that are affected by combination
frequencies of the form f_A+f_B-f_C intruding into the frequency range of the
independent modes.


title: Heavy-heavy-light quark potential in two approaches

abstract:
  We perform the first study about the heavy-heavy-light quark potential in
lattice QCD and a potential model. We find that the inter-two-quark confining
force is reduced by valence quark motional effects compared to the string
tension.


title: A New All-Sky Catalog of Stars with Large Proper Motions

abstract:
  A new all-sky catalog of stars with proper motions pm>0.15"/yr is presented.
The catalog is largely a product of the SUPERBLINK survey, a data-mining
initiative in which the entire Digitized Sky Surveys are searched for moving
stellar sources. Findings from earlier proper motions surveys are also
incorporated. The new all-sky catalog supersedes the great historic proper
motion catalogs assembled by W. J. Luyten (LHS, NLTT), and provides a virtually
complete (>98%) census of high proper motion stars down to magnitude R=19.


title: Affine interval exchange maps with a wandering interval

abstract:
  For almost all interval exchange maps T_0, with combinatorics of genus g>=2,
we construct affine interval exchange maps T which are semi-conjugate to T_0
and have a wandering interval.


title: U(1) invariant Membranes and Singularities

abstract:
  A formulation of U(1) - symmetric classical membrane motions (preserving one
rotational symmetry) is given, and reductions to systems of ODE's, as well as
some ideas concerning singularities and integrability.


title: A first-countable non-remainder of H

abstract:
  We give a (consistent) example of a first-countable continuum that is not a
remainder of the real line.


title: Lattice Homomorphisms between Sobolev Spaces

abstract:
  We show that every vector lattice homomorphism $T$ between Sobolev spaces can
be represented by a composition and a multiplication, that is, $T$ is of the
form $Tu(x)=u(h(x))g(x)$ for quasi every/almost every $x$ and all $u$.


title: Dynamical programming of continuously observed quantum systems

abstract:
  We develop dynamical programming methods for the purpose of optimal control
of quantum states with convex constraints and concave cost and bequest
functions of the quantum state. We consider both open loop and feedback control
schemes, which correspond respectively to deterministic and stochastic Master
Equation dynamics. For the quantum feedback control scheme with continuous
non-demolition observations we exploit the separation theorem of filtering and
control aspects for quantum stochastic dynamics to derive a generalized
Hamilton-Jacobi-Bellman equation. If the control is restricted to only
Hamiltonian terms this is equivalent to a Hamilton-Jacobi equation with an
extra linear dissipative term. In this work, we consider, in particular, the
case when control is restricted to only observation. A controlled qubit is
considered as an example throughout the development of the formalism. Finally,
we discuss optimum observation strategies to obtain a pure state from a mixed
state of a quantum two-level system.


title:
Nonequilibrium phase transition in the sedimentation of reproducing
  particles

abstract:
  We study numerically and analytically the dynamics of a sedimenting
suspension of active, reproducing particles, such as growing bacteria in a
gravitational field. In steady state we find a non-equilibrium phase transition
between a `sedimentation' regime, analogous to the sedimentation equilibrium of
passive colloids, and a `uniform' regime, in which the particle density is
constant in all but the top and bottom of the sample. We discuss the importance
of fluctuations in particle density in locating the phase transition point, and
report the kinetics of sedimentation at early times.


title:
Collective excitations in one-dimensional ultracold Fermi gases: a
  comparative study

abstract:
  Time-dependent density-functional theory (TDDFT) is a powerful tool to study
the non-equilibrium dynamics of inhomogeneous interacting many-body systems.
Here we show that the simple adiabatic local-spin-density approximation for the
time-dependent exchange-correlation potential is surprisingly accurate in
describing collective density and spin dynamics in strongly correlated
one-dimensional ultracold Fermi gases. Our conclusions are based on extensive
comparisons between our TDDFT results and accurate results based on the
adaptive time-dependent density-matrix renormalization-group method.


title:
Exact solution of a mean-field approach of an irreversible aggregation
  with a time dependent rate deposition

abstract:
  In this paper we propose a solution for the time evolution of the island
density with irreversible aggregation and a time dependent input of particle in
the space dimensions $d=1,2$. For this purpose we use the rate equation
resulting from a generalized mean field approach. A well-known technique for
growing surfaces at the atomic scale is molecular beam epitaxy (MBE). Another
approach is the pulsed laser deposition method (PLD). The main difference
between MBE and PLD is that in the case of MBE we have a continuous rate of
deposition $F$ of adatoms on the surface whereas in the case of PLD the adatoms
are deposited during a pulse of a laser which is very short in comparison to
the time span $T$ between the pulses. The generalized mean field theory is a
useful model for both MBE and PLD with the most simple approximation,
point-like island. We show that the parameter $T$ distinguishes the MBE regime
from the PLD regime. We solve the rate equation for the PLD regime. We consider
the time evolution of the density of immobile islands. For large time $t\gg T$,
the PLD regime dominates the MBE regime and we find that the density of
immobile islands grows as $t^{1/2}$ whereas for MBE we find the known behavior
of the density, $t^{1/3}$ for $d=2$ and $t^{1/4}$ for $d=1$. We illustrate this
result with Monte-Carlo simulations for $d=1,2$.


title: Pattern-based Model-to-Model Transformation: Long Version

abstract:
  We present a new, high-level approach for the specification of model-to-model
transformations based on declarative patterns. These are (atomic or composite)
constraints on triple graphs declaring the allowed or forbidden relationships
between source and target models. In this way, a transformation is defined by
specifying a set of triple graph constraints that should be satisfied by the
result of the transformation.
  The description of the transformation is then compiled into lower-level
operational mechanisms to perform forward or backward transformations, as well
as to establish mappings between two existent models. In this paper we study
one of such mechanisms based on the generation of operational triple graph
grammar rules. Moreover, we exploit deduction techniques at the specification
level to generate more specialized constraints (preserving the specification
semantics) reflecting pattern dependencies, from which additional rules can be
derived.
  This is an extended version of the paper submitted to ICGT'08, with
additional definitions and proofs.


title:
Radio spectra and polarisation properties of radio-loud Broad Absorption
  Line Quasars

abstract:
  We present multi-frequency observations of a sample of 15 radio-emitting
Broad Absorption Line Quasars (BAL QSOs), covering a spectral range between 74
MHz and 43 GHz. They display mostly convex radio spectra which typically peak
at about 1-5 GHz (in the observer's rest-frame), flatten at MHz frequencies,
probably due to synchrotron self-absorption, and become steeper at high
frequencies, i.e., >~ 20 GHz. VLA 22-GHz maps (HPBW ~ 80 mas) show unresolved
or very compact sources, with linear projected sizes of <= 1 kpc. About 2/3 of
the sample look unpolarised or weakly polarised at 8.4 GHz, frequency in which
reasonable upper limits could be obtained for polarised intensity. Statistical
comparisons have been made between the spectral index distributions of samples
of BAL and non-BAL QSOs, both in the observed and the rest-frame, finding
steeper spectra among non-BAL QSOs. However constraining this comparison to
compact sources results in no significant differences between both
distributions. This comparison is consistent with BAL QSOs not being oriented
along a particular line of sight. In addition, our analysis of the spectral
shape, variability and polarisation properties shows that radio BAL QSOs share
several properties common to young radio sources like Compact Steep Spectrum
(CSS) or Gigahertz-Peaked Spectrum (GPS) sources.


title:
Experimental (n,$\gamma$) cross sections of the p-process nuclei
  $^{74}$Se and $^{84}$Sr

abstract:
  The nucleosynthesis of elements beyond iron is dominated by the s and r
processes. However, a small amount of stable isotopes on the proton-rich side
cannot be made by neutron capture and are thought to be produced by
photodisintegration reactions on existing seed nuclei in the so-called "p
process". So far most of the p-process reactions are not yet accessible by
experimental techniques and have to be inferred from statistical
Hauser-Feshbach model calculations. The parametrization of these models has to
be constrained by measurements on stable proton-rich nuclei. A series of
(n,$\gamma$) activation measurements, related by detailed balance to the
respective photodisintegrations, were carried out at the Karlsruhe Van de
Graaff accelerator using the $^7$Li(p,n)$^7$Be source for simulating a
Maxwellian neutron distribution of kT= 25 keV. First results for the
experimental (n,$\gamma$) cross sections of the light p nuclei $^{74}$Se and
$^{84}$Sr are reported. These experimental values were used for an
extrapolation to the Maxwellian averaged cross section at 30 keV,
$<\sigma>_{30}$, yielding 271$\pm$15 mb for $^{74}$Se, and 300$\pm$17 mb for
the total capture cross section of $^{84}$Sr. The partial cross section to the
isomer in $^{85}$Sr was found to be 190$\pm$10 mb.


title: New Construction of 2-Generator Quasi-Twisted Codes

abstract:
  Quasi-twisted (QT) codes are a generalization of quasi-cyclic (QC) codes.
Based on consta-cyclic simplex codes, a new explicit construction of a family
of 2-generator quasi-twisted (QT) two-weight codes is presented. It is also
shown that many codes in the family meet the Griesmer bound and therefore are
length-optimal. New distance-optimal binary QC [195, 8, 96], [210, 8, 104] and
[240, 8, 120] codes, and good ternary QC [208, 6, 135] and [221, 6, 144] codes
are also obtained by the construction.


title:
KADoNiS- The Karlsruhe Astrophysical Database of Nucleosynthesis in
  Stars

abstract:
  The "Karlsruhe Astrophysical Database of Nucleosynthesis in Stars" (KADoNiS)
project is an online database for experimental cross sections relevant to the s
process and p process. It is available under
http://nuclear-astrophysics.fzk.de/kadonis and consists of two parts. Part 1 is
an updated sequel to the previous Bao et al. compilations from 1987 and 2000
for (n,$\gamma$) cross sections relevant to the big bang and s-process
nucleosynthesis. The second part will be an experimental p-process database,
which is expected to be launched in winter 2005/06. The KADoNiS project started
in April 2005, and a first partial update is online since August 2005. In this
paper we present a short overview of the first update of the s-process
database, as well as an overview of the status of stellar (n,$\gamma$) cross
sections of all 32 p isotopes.


title:
Special fast diffusion with slow asymptotics. Entropy method and flow on
  a Riemannian manifold

abstract:
  We consider the asymptotic behaviour of positive solutions $u(t,x)$ of the
fast diffusion equation $u_t=\Delta (u^{m}/m)={\rm div} (u^{m-1}\nabla u)$
posed for $x\in\RR^d$, $t>0$, with a precise value for the exponent
$m=(d-4)/(d-2)$. The space dimension is $d\ge 3$ so that $m<1$, and even $m=-1$
for $d=3$. This case had been left open in the general study \cite{BBDGV} since
it requires quite different functional analytic methods, due in particular to
the absence of a spectral gap for the operator generating the linearized
evolution.
  The linearization of this flow is interpreted here as the heat flow of the
Laplace-Beltrami operator of a suitable Riemannian Manifold $(\RR^d,{\bf g})$,
with a metric ${\bf g}$ which is conformal to the standard $\RR^d$ metric.
Studying the pointwise heat kernel behaviour allows to prove {suitable
Gagliardo-Nirenberg} inequalities associated to the generator. Such
inequalities in turn allow to study the nonlinear evolution as well, and to
determine its asymptotics, which is identical to the one satisfied by the
linearization. In terms of the rescaled representation, which is a nonlinear
Fokker--Planck equation, the convergence rate turns out to be polynomial in
time. This result is in contrast with the known exponential decay of such
representation for all other values of $m$.


title:
QCD corrections to J/psi production via color octet states at Tevatron
  and LHC

abstract:
  The remarkable discrepancy between theory and data on the p_t distribution of
J/psi polarization in the process pp -> J/psi+X has been standing as a puzzle
for a long time. Our early work indicates that if only considering the
color-singlet state, NLO corrections may drastically change the distribution,
but are not sufficient to accommodate the data. The color-octet intermediate
state was suggested to make up the gap. Therefore a direct motivation is to
evaluate if the NLO corrections to the J/psi production via a color-octet can
indeed remedy the problem. Unfortunately, our results show that even the NLO
corrections to both color-singlet and octet states are accounted, the data
cannot be understood yet in the framework of the present theory, but there, as
observed, still a small window remains, namely a P-wave octet might
substantially contribute.


title:
An Approximate Calculation of Active Pixel Sensors Temporal Noise for
  High Energy Physics

abstract:
  A simple calculation of the temporal noise of an elementary pixel is made.
The equivalent noise charge takes into consideration the series and parallel
noise as a function of the observation time.


title:
Laser-induced operations with charge qubits in a double-well
  nanostructure

abstract:
  We present the results of theoretical studies on operations with charge
qubits in the system composed of two tunnel-coupled semiconductor quantum dots
whose two lowest states (localized in different dots) define the logical qubit
states while two excited states (delocalized between the dots) serve for the
electron transfer from one dot to another under the influence of the laser
pulse. It is shown that in the case of small energy separation between the
excited levels, the optimal (from the viewpoint of minimal single-qubit
operation time and maximum operation fidelity) strategy is to tune the laser
frequency between the excited levels. The pulse parameters for implementation
of the quantum NOT operation are determined. Analytical results obtained in the
rotating-wave approximation are confirmed by rigorous numerical calculations.


title: Managing conflicts between users in Wikipedia

abstract:
  Wikipedia is nowadays a widely used encyclopedia, and one of the most visible
sites on the Internet. Its strong principle of collaborative work and free
editing sometimes generates disputes due to disagreements between users. In
this article we study how the wikipedian community resolves the conflicts and
which roles do wikipedian choose in this process. We observed the users
behavior both in the article talk pages, and in the Arbitration Committee pages
specifically dedicated to serious disputes. We first set up a users typology
according to their involvement in conflicts and their publishing and management
activity in the encyclopedia. We then used those user types to describe users
behavior in contributing to articles that are tagged by the wikipedian
community as being in conflict with the official guidelines of Wikipedia, or
conversely as being well featured.


title:
(n,$\gamma$) Cross Sections of Light p Nuclei -- Towards an Updated
  Database for the p Process

abstract:
  The nucleosynthesis of elements beyond iron is dominated by the s and r
processes. However, a small amount of stable isotopes on the proton-rich side
cannot be made by neutron capture and are thought to be produced by
photodisintegration reactions on existing seed nuclei in the so-called "p
process". So far most of the p-process reactions are not yet accessible by
experimental techniques and have to be inferred from statistical
Hauser-Feshbach model calculations. The parametrization of these models has to
be constrained by measurements on stable proton-rich nuclei. A series of
(n,$\gamma$) activation measurements on p nuclei, related by detailed balance
to the respective photodisintegrations, were carried out at the Karlsruhe Van
de Graaff accelerator using the $^7$Li(p,n)$^7$Be source for simulating a
Maxwellian neutron distribution of kT= 25 keV. We present here preliminary
results of our extended measuring program in the mass range between A=74 and
A=132, including first experimental (n,$\gamma$) cross sections of $^{74}$Se,
$^{84}$Sr, $^{120}$Te and $^{132}$Ba, and an improved value for $^{130}$Ba. In
all cases we find perfect agreement with the recommended MACS predictions from
the Bao et al. compilation.


title: $p$-Process simulations with a modified reaction library

abstract:
  We have performed $p$-process simulations with the most recent stellar
$(n,\gamma)$ cross sections from the "Karlsruhe Astrophysical Database of
Nucleosynthesis in Stars" project (version v0.2,
http://nuclear-astrophysics.fzk.de/kadonis). The simulations were carried out
with a parametrized supernova type II shock front model (``$\gamma$ process'')
of a 25 solar mass star and compared to recently published results. A decrease
in the normalized overproduction factor could be attributed to lower cross
sections of a significant fraction of seed nuclei located in the Bi and Pb
region around the $N$=126 shell closure.


title: Restrictions on modeling spin injection by resistor networks

abstract:
  Because of the technical difficulties of solving spin transport equations in
inhomogeneous systems, different resistor networks are widely applied for
modeling spin transport. By comparing an analytical solution for spin injection
across a ferromagnet - paramagnet junction with a resistor model approach, its
essential limitations stemming from inhomogeneous spin populations are
clarified.


title:
Beating the spin-down limit on gravitational wave emission from the Crab
  pulsar

abstract:
  We present direct upper limits on gravitational wave emission from the Crab
pulsar using data from the first nine months of the fifth science run of the
Laser Interferometer Gravitational-wave Observatory (LIGO). These limits are
based on two searches. In the first we assume that the gravitational wave
emission follows the observed radio timing, giving an upper limit on
gravitational wave emission that beats indirect limits inferred from the
spin-down and braking index of the pulsar and the energetics of the nebula. In
the second we allow for a small mismatch between the gravitational and radio
signal frequencies and interpret our results in the context of two possible
gravitational wave emission mechanisms.


title: Parton Energy Loss Without Transverse Momentum Broadening

abstract:
  The JEWEL 1.0 Monte Carlo simulates jet evolution in a medium with a
microscopic description of splitting and scattering processes. In the framework
of this model we investigate the transverse momentum broadening due to medium
effects in different scenarios. Depending on assumptions about hadronisation,
we observe either a small increase or even a slight decrease of the mean
transverse momentum, but no sizeable broadening. This appears to be a natural
consequence of a model formulation which conserves energy and momentum
microscopically at each splitting and at each scattering.


title: Lorentzian Lie n-algebras

abstract: We classify Lie n-algebras possessing an invariant lorentzian inner product.


title:
Sobolev spaces with respect to measures in curves and zeros of Sobolev
  orthogonal polynomials

abstract:
  In this paper we obtain some practical criteria to bound the multiplication
operator in Sobolev spaces with respect to measures in curves. As a consequence
of these results, we characterize the weighted Sobolev spaces with bounded
multiplication operator, for a large class of weights. To have bounded
multiplication operator has important consequences in Approximation Theory: it
implies the uniform bound of the zeros of the corresponding Sobolev orthogonal
polynomials, and this fact allows to obtain the asymptotic behavior of Sobolev
orthogonal polynomials. We also obtain some non-trivial results about these
Sobolev spaces with respect to measures; in particular, we prove a main result
in the theory: they are Banach spaces.


title: Structure of the Universe: Generalization of Weinberg relation

abstract:
  Weinberg relation can be explained by Newton laws. It can also be transformed
into a relation between a gravitational cross section area, associated to a
gravitational mass m, and the product of two gravitational radii corresponding
to the mass m and to the mass M of the Universe. Using a physical similarity
process we propose a convective cascade mechanism to explain the structures
present in the Universe. The proposal includes the vacuum fluctuations as the
heating source for convection to take place. The fundamental Rayleigh number is
used with a value of 1100, as in the case of the granules observed in the sun
photosphere. Computer simulations results give structures that resemble a
configuration of the type of the Benard cells. We present the similarity of our
results with the actual structures in the Universe (masses and sizes).


title:
Physical realization and identification of topological excitations in
  quantum Heisenberg ferromagnet on lattice

abstract:
  Physical spin configurations corresponding to topological excitations
expected to be present in the XY limit of a purely quantum spin 1/2 Heisenberg
ferromagnet, are probed on a two dimensional square lattice. Quantum vortices
(anti-vortices) are constructed in terms of coherent spin field components as
limiting case of meronic (anti-meronic) configurations. The crucial role of the
associated Wess-Zumino term is highlighted in our procedure. It is shown that
this term can identify a large class of vortices (anti-vortices). In particular
the excitations having odd topological charges form this class and also
exihibit a self-similar pattern regarding the internal charge distribution.
This manifestation of different behaviour of the odd and the even topological
sectors is very prominent in the strongly quantum regime but fades away as we
go to higher spins. Our formalism is distinctly different from the conventional
approach for the construction of quantum vortices (anti-vortices).


title: D and D_s in mass loaded flux tube

abstract:
  Heavy-light hadrons are studied in a mass loaded flux tube model. The study
indicates that the dynamics of mesons and baryons containing a $c$ quark is
well described by the mass loaded flux tube. The hypothesis of good
diquark-antiquark degeneracy is found reasonable in heavy-light quark systems.
The spectrum of charmed ($D$) and charmed strange ($D_s$) mesons is
systematically computed. $D$ and $D_s$ in 1D multiplets are predicted to have
lower masses in comparison with other theoretical predictions. The predicted
masses of the $1^-(1^3D_1)$ and the $3^-(1^3D_3)$ $D_s$ agree well with those
of recently observed $D_{s1}(2700)^{\pm}$ and $D_{sJ}(2860)$, respectively.


title: Markov chain-based stability analysis of growing networks

abstract:
  From the perspective of probability, the stability of growing network is
studied in the present paper. Using the DMS model as an example, we establish a
relation between the growing network and Markov process. Based on the concept
and technique of first-passage probability in Markov theory, we provide a
rigorous proof for existence of the steady-state degree distribution,
mathematically re-deriving the exact formula of the distribution. The approach
based on Markov chain theory is universal and performs well in a large class of
growing networks.


title:
Bound states in N=2 Liouville theory with boundary and Deep throat
  D-branes

abstract:
  We exhibit bound states in the spectrum of non-compact D-branes in N=2
Liouville conformal field theory. We interpret these states in the study of
D-branes in the near-horizon limit of Neveu-Schwarz five-branes spread on a
topologically trivial circle. We match semi-classical di-electric and repulsion
effects with exact conformal field theory results and describe the fate of
D-branes hitting NS5-branes. We also show that the bound states can give rise
to massless vector and hyper multiplets in a low-energy gauge theory on
D-branes deep inside the throat.


title: The end of the p-form hierarchy

abstract:
  The introduction of a non-abelian gauge group embedded into the rigid
symmetry group G of a field theory with abelian vector fields and no
corresponding charges, requires in general the presence of a hierarchy of
p-form gauge fields. The full gauge algebra of this hierarchy can be defined
independently of a specific theory and is encoded in the embedding tensor that
determines the gauge group. When applied to specific Lagrangians, the algebra
is deformed in an intricate way and in general will only close up to equations
of motion. The group-theoretical structure of the hierarchy exhibits many
interesting features, which have been studied starting from the low-p forms.
Here the question is addressed what happens generically for high values of p.
In addition a number of other features is discussed concerning the role that
the p-forms play in various deformations of the theory.


title: Following the Path of Charm: New Physics at the LHC

abstract:
  I will argue that the same kind of reasoning, which led us to predict the
opening of a new chapter in hadron physics, may shed some light on the
existence of new physics at the as yet unexplored energy scales of LHC.


title: High-density QCD with CMS at the LHC

abstract:
  The capabilities of the CMS experiment to explore the rich heavy-ion physics
programme offered by the CERN Large Hadron Collider (LHC) are summarised.
Various representative measurements in Pb-Pb collisions at sqrt(s) = 5.5 TeV
are covered. These include "bulk" observables (charged hadron multiplicity,
low-pT inclusive hadron spectra and elliptic flow) which provide information on
the collective properties of the system; as well as perturbative processes
(high-pT hadrons, jets, gamma-jet and quarkonium production) which yield
"tomographic" information of the densest phases of the reaction.


title: Benchmark graphs for testing community detection algorithms

abstract:
  Community structure is one of the most important features of real networks
and reveals the internal organization of the nodes. Many algorithms have been
proposed but the crucial issue of testing, i.e. the question of how good an
algorithm is, with respect to others, is still open. Standard tests include the
analysis of simple artificial graphs with a built-in community structure, that
the algorithm has to recover. However, the special graphs adopted in actual
tests have a structure that does not reflect the real properties of nodes and
communities found in real networks. Here we introduce a new class of benchmark
graphs, that account for the heterogeneity in the distributions of node degrees
and of community sizes. We use this new benchmark to test two popular methods
of community detection, modularity optimization and Potts model clustering. The
results show that the new benchmark poses a much more severe test to algorithms
than standard benchmarks, revealing limits that may not be apparent at a first
analysis.


title: Nuclear modification at sqrt{s_{NN}}=17.3 GeV, measured at NA49

abstract:
  Transverse momentum spectra up to 4.5 GeV/c were measured around midrapidity
in Pb+Pb reactions at sqrt{s_{NN}}=17.3 GeV, for pi^{+/-}, p, pbar and K^{+/-},
by the NA49 experiment. The nuclear modification factors R_{AA}, R_{AA/pA} and
R_{CP} were extracted and are compared to RHIC results at sqrt{s_{NN}}=200 GeV.
The modification factor R_{AA} shows a rapid increase with transverse momentum
in the covered region. The modification factor R_{CP} shows saturation well
below unity in the pi^{+/-} channel. The extracted R_{CP} values follow the 200
GeV RHIC results closely in the available transverse momentum range for all
particle species. For pi^{+/-} above 2.5 GeV/c transverse momentum, the
measured suppression is smaller than that observed at RHIC. The nuclear
modification factor R_{AA/pA} for pi^{+/-} stays well below unity.


title: A search for southern ultracool dwarfs in young moving groups

abstract:
  We associate 132 low-mass ultracool dwarfs in the southern hemisphere as
candidate members of five moving groups using photometric and astrometric
selection techniques. Of these objects, we present high resolution spectroscopy
for seven candidates and combine these with previous measurements from the
literature to determine spectral types and radial velocities. We thus constrain
distance and space motion spectroscopically, allowing the kinematic membership
of the moving groups to be assessed. Possible membership of moving groups has
allowed ages and metallicities to be constrained for these objects and
evolutionary models have been used to estimate their mass. We estimate that up
to ~75 of our candidate moving group members should be genuine, and discuss
future work that will confirm and exploit this major new sample.