title:
An analysis of the possible thermal emission at radio frequencies from
  an evolved supernova remnant HB 3 (G132.7 + 1.3): revisited

abstract:
  It has recently been reported that some of the flux density values for an
evolved supernova remnant (SNR) HB 3 (G132.7 + 1.3) are not accurate. In this
work we revised an analysis of the possible thermal emission at radio
frequencies from the SNR HB 3 using the recently published, corrected, flux
density values. A model including a sum of non-thermal (purely synchrotron) and
thermal (bremsstrahlung) component is applied for fitting integrated radio
spectrum of the SNR. The contribution of thermal component in total volume
emissivity at $1 \mathrm{GHz}$ was estimated to be $\approx37 %$. The ambient
density was also estimated to be $n\approx 9 \mathrm{cm}^{-3}$ for the
$\mathrm{T}=10^{4} \mathrm{K}$. Again, we obtained the relatively significant
presence of thermal emission at radio frequencies from the SNR so we could
support interaction between SNR HB 3 and adjacent molecular cloud associated
with the H {\sc ii} region W3. Our model estimates for thermal component
contribution to total volume emissivity at $1 \mathrm{GHz}$ and ambient density
are similar to those obtained earlier ($\approx40 %$, $\approx10
\mathrm{cm^{-3}}$). It is clear that the corrected flux density values do not
change the basic conclusions.


title:
Dynamical symmetry of Dirac hydrogen atom with spin symmetry and its
  connection with Ginocchio's oscillator

abstract:
  The Dirac hydrogen atom with spin symmetry is shown has a SO(4) symmetry. The
generators are derived, and the corresponding Casimir operator leads to the
energy spectrum naturally. This type hydrogen atom is connected to a
four-dimensional Dirac system with equal scalar and vector harmonic oscillator
potential, by the Kustaanheimo-Stiefel transformation with a constraint.


title:
Association of the 3:2 HFQPO Pairs with the Broad Fe K Line in XTE
  J1550-564 and GRO J1655-40

abstract:
  Association of the high-frequency quasi-periodic oscillation (HFQPO) pairs
with the broad Fe K line in XTE J1550-564 and GRO J1655-40 is discussed based
on the magnetic coupling (MC) of a rotating black hole (BH) with its
surrounding disc. The 3:2 HFQPO pairs are interpreted by virtue of the inner
and outer hotspots arising from non-axisymmetric magnetic field, where the
inner hotspot is produced by a torque exerted at the inner edge of the disc,
and the outer hotspot is created by the screw instability of the large-scale
magnetic field. The very steep emissivity index is created predominantly by the
torque exerted at the inner edge of the disc. It turns out that the 3:2 HFQPO
pairs observed in the two sources can be fitted by tuning several model
parameters, such as the BH spin, and the main features of this model lie in
three aspects. (1) The condition for only one HFQPO is discussed based on the
two mechanisms for producing the 3:2 HFQPO pairs, (2) an explanation is given
for a systematic shift away from disc dominated flux with the increasing
power-law flux as the HFQPO pairs shift from the higher to lower frequencies,
which is consistent with the analysis given by Remillard et al. (2002), and (3)
the BH spin in XTE J1550-564 and GRO J1655-40 can be estimated by combining the
3:2 HFQPO pairs with the very steep emissivity index required for fitting the
broad Fe K emission line.


title: An Unified Definition of Data Mining

abstract:
  Since many years, theoretical concepts of Data Mining have been developed and
improved. Data Mining has become applied to many academic and industrial
situations, and recently, soundings of public opinion about privacy have been
carried out. However, a consistent and standardized definition is still
missing, and the initial explanation given by Frawley et al. has pragmatically
often changed over the years. Furthermore, alternative terms like Knowledge
Discovery have been conjured and forged, and a necessity of a Data Warehouse
has been endeavoured to persuade the users. In this work, we pick up current
definitions and introduce an unified definition that covers existing attempted
explanations. For this, we appeal to the natural original of chemical states of
aggregation.


title:
Proportional fairness and its relationship with multi-class queueing
  networks

abstract:
  We consider multi-class single-server queueing networks that have a product
form stationary distribution. A new limit result proves a sequence of such
networks converges weakly to a stochastic flow level model. The stochastic flow
level model found is insensitive. A large deviation principle for the
stationary distribution of these multi-class queueing networks is also found.
Its rate function has a dual form that coincides with proportional fairness. We
then give the first rigorous proof that the stationary throughput of a
multi-class single-server queueing network converges to a proportionally fair
allocation. This work combines classical queueing networks with more recent
work on stochastic flow level models and proportional fairness. One could view
these seemingly different models as the same system described at different
levels of granularity: a microscopic, queueing level description; a
macroscopic, flow level description and a teleological, optimization
description.


title:
Representation of operators in the time-frequency domain and generalized
  Gabor multipliers

abstract:
  Starting from a general operator representation in the time-frequency domain,
this paper addresses the problem of approximating linear operators by operators
that are diagonal or band-diagonal with respect to Gabor frames. A
characterization of operators that can be realized as Gabor multipliers is
given and necessary conditions for the existence of (Hilbert-Schmidt) optimal
Gabor multiplier approximations are discussed and an efficient method for the
calculation of an operator's best approximation by a Gabor multiplier is
derived. The spreading function of Gabor multipliers yields new error estimates
for these approximations. Generalizations (multiple Gabor multipliers) are
introduced for better approximation of overspread operators. The Riesz property
of the projection operators involved in generalized Gabor multipliers is
characterized, and a method for obtaining an operator's best approximation by a
multiple Gabor multiplier is suggested. Finally, it is shown that in certain
situations, generalized Gabor multipliers reduce to a finite sum of regular
Gabor multipliers with adapted windows.


title: Infinite-randomness quantum critical points induced by dissipation

abstract:
  We develop a strong-disorder renormalization group to study quantum phase
transitions with continuous O$(N)$ symmetry order parameters under the
influence of both quenched disorder and dissipation. For Ohmic dissipation, as
realized in Hertz' theory of the itinerant antiferromagnetic transition or in
the superconductor-metal transition in nanowires, we find the transition to be
governed by an exotic infinite-randomness fixed point in the same universality
class as the (dissipationless) random transverse-field Ising model. We
determine the critical behavior and calculate key observables at the transition
and in the associated quantum Griffiths phase. We also briefly discuss the
cases of superohmic and subohmic dissipations.


title: Kondo effects in a C_60 single-molecule transistor

abstract:
  We have used the electromigration technique to fabricate a
  $\rm{C_{{60}}}$ single-molecule transistor (SMT). We present a full
experimental study as a function of temperature, down to 35 mK, and as a
function of magnetic field up to 8 T in a SMT with odd number of electrons,
where the usual spin-1/2 Kondo effect occurs, with good agreement with theory.
In the case of even number of electrons, a low temperature magneto-transport
study is provided, which demonstrates a Zeeman splitting of the zero-bias
anomaly at energies well below the Kondo scale.


title: Quasi-classical Hawking Temperatures and Black Hole Thermodynamics

abstract:
  The semi-classical derivation of Hawking radiation for axially symmetric,
stationary spacetimes with a Killing horizon is examined following the recent
quasi-classical tunneling analysis and a simple formula is found for the
inverse Hawking temperature $\beta = 1/T_H$. The formula is invariant under
canonical transformations and is shown to be equivalent to the integral of a
closed differential 1-form around the horizon enclosing a pole. The Hawking
temperature is then given in terms of the winding number in the first homotopy
group of the torus formed from the compactified imaginary parts of the
analytically continued radial and time variables.


title:
The structure of molecular clouds and the universality of the clump mass
  function

abstract:
  Using an SPH simulation of a star-forming region in a molecular cloud, we
show that the emergence of a clump mass function (CMF) resembling the stellar
initial mass function (IMF) is a ubiquitous feature of molecular cloud
structure, but caution against its over-interpretation. We employ three
different techniques to extract the clumps in this study. In the first two, we
interpolate the SPH particle data to 2 and 3 dimensional grids before
performing the clump-find, using position-position (PP) and
position-position-velocity (PPV) information respectively. In the last
technique, the clump-finding is performed on the SPH data directly, making use
of the full 3 dimensional position information. Although the CMF is typically
similar to that observed in regions of nearby star formation, the individual
clumps and their masses are found to be unreliable since they depend strongly
on the parameters and the method of the clump-finding. In particular we find
that the resolution and orientation of the data make a significant difference
to the resulting properties of the identified clumps in the PP and PPV cases.
We conclude that making comparisons between a CMF and the stellar IMF should be
done with caution, since the definition of a clump boundary, and hence the
number of clumps and their properties, are arbitrary in the extraction method.
This is especially true if molecular clouds are truly scale free.


title: The Weibull-Geometric distribution

abstract:
  In this paper we introduce, for the first time, the Weibull-Geometric
distribution which generalizes the exponential-geometric distribution proposed
by Adamidis and Loukas (1998). The hazard function of the last distribution is
monotone decreasing but the hazard function of the new distribution can take
more general forms. Unlike the Weibull distribution, the proposed distribution
is useful for modeling unimodal failure rates. We derive the cumulative
distribution and hazard functions, the density of the order statistics and
calculate expressions for its moments and for the moments of the order
statistics. We give expressions for the R\'enyi and Shannon entropies. The
maximum likelihood estimation procedure is discussed and an algorithm EM
(Dempster et al., 1977; McLachlan and Krishnan, 1997) is provided for
estimating the parameters. We obtain the information matrix and discuss
inference. Applications to real data sets are given to show the flexibility and
potentiality of the proposed distribution.


title: A Rational Approach to the Resonance Region

abstract:
  Resonance Saturation in QCD can be understood in the large-Nc limit from the
mathematical theory of Pade Approximants to meromorphic functions.


title:
Preparing ground states of quantum many-body systems on a quantum
  computer

abstract:
  Preparing the ground state of a system of interacting classical particles is
an NP-hard problem. Thus, there is in general no better algorithm to solve this
problem than exhaustively going through all N configurations of the system to
determine the one with lowest energy, requiring a running time proportional to
N. A quantum computer, if it could be built, could solve this problem in time
sqrt(N). Here, we present a powerful extension of this result to the case of
interacting quantum particles, demonstrating that a quantum computer can
prepare the ground state of a quantum system as efficiently as it does for
classical systems.


title:
Out-of-equilibrium singlet-triplet Kondo effect in a single C_60 quantum
  dot

abstract:
  We have used an electromigration technique to fabricate a $\rm{C_{{60}}}$
single-molecule transistor (SMT). Besides describing our electromigration
procedure, we focus and present an experimental study of a single molecule
quantum dot containing an even number of electrons, revealing, for two
different samples, a clear out-of-equilibrium Kondo effect. Low temperature
magneto-transport studies are provided, which demonstrates a Zeeman splitting
of the finite bias anomaly.


title: Chain inflation and the imprint of fundamental physics in the CMBR

abstract:
  In this work we investigate characteristic modifications of the spectrum of
cosmological perturbations and the spectral index due to chain inflation. We
find two types of effects. First, modifications of the spectral index depending
on interactions between radiation and the vacuum, and on features of the
effective vacuum potential of the underlying fundamental theory. Second, a
modulation of the spectrum signalling new physics due to bubble nucleation.
This effect is similar to those of transplanckian physics. Measurements of such
signatures could provide a wealth of information on the fundamental physics at
the basis of inflation.


title: Heavy ion event generator HYDJET++ (HYDrodynamics plus JETs)

abstract:
  HYDJET++ is a Monte-Carlo event generator for simulation of relativistic
heavy ion AA collisions considered as a superposition of the soft, hydro-type
state and the hard state resulting from multi-parton fragmentation. This model
is the development and continuation of HYDJET event generator (Lokhtin &
Snigirev, 2006, EPJC, 45, 211). The main program is written in the
object-oriented C++ language under the ROOT environment. The hard part of
HYDJET++ is identical to the hard part of Fortran-written HYDJET and it is
included in the generator structure as a separate directory. The soft part of
HYDJET++ event is the "thermal" hadronic state generated on the chemical and
thermal freeze-out hypersurfaces obtained from the parameterization of
relativistic hydrodynamics with preset freeze-out conditions. It includes the
longitudinal, radial and elliptic flow effects and the decays of hadronic
resonances. The corresponding fast Monte-Carlo simulation procedure, C++ code
FAST MC (Amelin et al., 2006, PRC, 74, 064901; 2008, PRC, 77, 014903) is
adapted to HYDJET++. It is designed for studying the multi-particle production
in a wide energy range of heavy ion experimental facilities: from FAIR and NICA
to RHIC and LHC.


title: Phase diagram of asymmetric Fermi gas across Feshbach resonance

abstract:
  We study the phase diagram of the dilute two-component Fermi gas at zero
temperature as a function of the polarization and coupling strength. We map out
the detailed phase separations between superfluid and normal states near the
Feshbach resonance. We show that there are three different coexistence of
superfluid and normal phases corresponding to phase separated states between:
(I) the partially polarized superfluid and the fully polarized normal phases,
(II) the unpolarized superfluid and the fully polarized normal phases and (III)
the unpolarized superfluid and the partially polarized normal phases from
strong-coupling BEC side to weak-coupling BCS side. For pairing between two
species, we found this phase separation regime gets wider and moves toward the
BEC side for the majority species are heavier but shifts to BCS side and
becomes narrow if they are lighter.


title:
On the dimension of invariant measures of endomorphisms of
  $\mathbb{CP}^k$

abstract:
  Let $f$ be an endomorphism of $\mathbb{CP}^k$ and $\nu$ be an $f$-invariant
measure with positive Lyapunov exponents $(\lambda_1,\...,\lambda_k)$. We prove
a lower bound for the pointwise dimension of $\nu$ in terms of the degree of
$f$, the exponents of $\nu$ and the entropy of $\nu$. In particular our result
can be applied for the maximal entropy measure $\mu$. When $k=2$, it implies
that the Hausdorff dimension of $\mu$ is estimated by $\dim_{\cal H} \mu \geq
{\log d \over \lambda_1} + {\log d \over \lambda_2}$, which is half of the
conjectured formula. Our method for proving these results consists in studying
the distribution of the $\nu$-generic inverse branches of $f^n$ in
$\mathbb{CP}^k$. Our tools are a volume growth estimate for the bounded
holomorphic polydiscs in $\mathbb{CP}^k$ and a normalization theorem for the
$\nu$-generic inverse branches of $f^n$.


title:
2MASS Two-color Interstellar Reddening Line in the Direction of the
  North America and Pelican Nebulae and the Cyg OB2 Association

abstract:
  The slope of the interstellar reddening line in the J-H vs. H-Ks diagram of
the 2MASS survey in the direction of the North America and Pelican nebulae, the
L935 dust cloud and the Cyg OB2 association is determined. The MK types were
either classified by C. J. Corbally or collected from the literature. The ratio
E(J-H)/E(H-Ks) = 2.0 is obtained by taking the average for the four groups of
spectral classes: O3--B1, B2--B6, B7--B9.5 and red clump giants. The obtained
ratio is larger than the `typical' value, 1.7-1.8.


title:
Liquid-liquid transition in supercooled silicon determined by
  first-principles simulation

abstract:
  First principles molecular dynamics simulations reveal a liquid-liquid phase
transition in supercooled elemental silicon. Two phases coexist below
$T_c\approx 1232K$. The low density phase is nearly tetra-coordinated, with a
pseudogap at the Fermi surface, while the high density phase is more highly
coordinated and metallic in nature. The transition is observed through the
formation of van der Waals loops in pressure-volume isotherms below $T_c$.


title:
On some new invariants for strong shift equivalence for shifts of finite
  type

abstract:
  We introduce a new computable invariant for strong shift equivalence of
shifts of finite type. The invariant is based on an invariant introduced by
Trow, Boyle, and Marcus, but has the advantage of being readily computable.
  We summarize briefly a large-scale numerical experiment aimed at deciding
strong shift equivalence for shifts of finite type given by irreducible
$2\times 2$-matrices with entry sum less than 25, and give examples
illustrating to power of the new invariant, i.e., examples where the new
invariant can disprove strong shift equivalence whereas the other invariants
that we use can not.


title:
Matrix genetics, part 4: cyclic changes of the genetic 8-dimensional
  Yin-Yang-algebras and the algebraic models of physiological cycles

abstract:
  The article continues an analysis of the genetic 8-dimensional
Yin-Yang-algebra. This algebra was revealed in a course of matrix researches of
structures of the genetic code and it was described in the author's articles
arXiv:0803.3330 and arXiv:0805.4692. The article presents data about many kinds
of cyclic permutations of elements of the genetic code in the genetic
(8x8)-matrix [C A; U G](3) of 64 triplets, where C, A, U, G are letters of the
genetic alphabet. These cyclic permutations lead to such reorganizations of the
matrix form of presentation of the initial genetic Yin-Yang-algebra that arisen
matrices serve as matrix forms of presentations of new Yin-Yang-algebras as
well. They are connected algorithmically with Hadamard matrices. The discovered
existence of a hierarchy of the cyclic changes of types of genetic
Yin-Yang-algebras allows thinking about new algebraic-genetic models of cyclic
processes in inherited biological systems including models of cyclic
metamorphoses of animals. These cycles of changes of the genetic 8-dimensional
algebras and of their 8-dimensional numeric systems have many analogies with
famous facts and doctrines of modern and ancient physiology, medicine, etc.
This viewpoint proposes that the famous idea by Pythagoras (about organization
of natural systems in accordance with harmony of numerical systems) should be
combined with the idea of cyclic changes of Yin-Yang-numeric systems in
considered cases. This second idea reminds of the ancient idea of cyclic
changes in nature. From such algebraic-genetic viewpoint, the notion of
biological time can be considered as a factor of coordinating these
hierarchical ensembles of cyclic changes of types of the genetic
multi-dimensional algebras.


title: Phase transition of the nucleon-antinucleon plasma at different ratios

abstract:
  We investigate phase transitions for the Walecka model at very high
temperatures. As is well known, depending on the parametrization of this model
and for the particular case of a zero chemical potential ($ \mu $), a first
order phase transition is possible \cite{theis}. We investigate this model for
the case in which $ \mu \ne 0 $. It turns out that, in this situation, phases
with different values of antinucleon-nucleon ratios and net baryon densities
may coexist. We present the temperature versus antinucleon-nucleon ratio as
well as the temperature versus the net baryon density for the coexistence
region. The temperature versus chemical potential phase diagram is also
presented.


title: Quantum theta functions and Gabor frames for modulation spaces

abstract:
  Representations of the celebrated Heisenberg commutation relations in quantum
mechanics and their exponentiated versions form the starting point for a number
of basic constructions, both in mathematics and mathematical physics (geometric
quantization, quantum tori, classical and quantum theta functions) and signal
analysis (Gabor analysis).
  In this paper we try to bridge the two communities, represented by the two
co--authors: that of noncommutative geometry and that of signal analysis. After
providing a brief comparative dictionary of the two languages, we will show
e.g. that the Janssen representation of Gabor frames with generalized Gaussians
as Gabor atoms yields in a natural way quantum theta functions, and that the
Rieffel scalar product and associativity relations underlie both the functional
equations for quantum thetas and the Fundamental Identity of Gabor analysis.


title: Cosmic rays studied with a hybrid high school detector array

abstract:
  The LORUN/NAHSA system is a pathfinder for hybrid cosmic ray research
combined with education and outreach in the field of astro-particle physics.
Particle detectors and radio antennae were mainly setup by students and placed
on public buildings. After fully digital data acquisition, coincidence
detections were selected. Three candidate events confirmed a working prototype,
which can be multiplied to extend further particle detector arrays on high
schools.


title: Resonant circular photogalvanic effect in GaN/AlGaN heterojunctions

abstract:
  The resonant circular photogalvanic effect is observed in wurtzite
(0001)-oriented GaN low-dimensional structures excited by infrared radiation.
The current is induced by angular momentum transfer of photons to the
photoexcited electrons at resonant inter-subband optical transitions in a
GaN/AlGaN heterojunction. The signal reverses upon the reversal of the
radiation helicity or, at fixed helicity, when the propagation direction of the
photons is reversed. Making use of the tunability of the free-electron laser
FELIX we demonstrate that the current direction changes by sweeping the photon
energy through the intersubband resonance condition, in agreement with
theoretical considerations.


title: Criteria for strong and weak random attractors

abstract:
  The theory of random attractors has different notions of attraction, amongst
them pullback attraction and weak attraction. We investigate necessary and
sufficient conditions for the existence of pullback attractors as well as of
weak attractors.


title:
The multicomponent 2D Toda hierarchy: Discrete flows and string
  equations

abstract:
  The multicomponent 2D Toda hierarchy is analyzed through a factorization
problem associated to an infinite-dimensional group. A new set of discrete
flows is considered and the corresponding Lax and Zakharov--Shabat equations
are characterized. Reductions of block Toeplitz and Hankel bi-infinite matrix
types are proposed and studied. Orlov--Schulman operators, string equations and
additional symmetries (discrete and continuous) are considered. The
continuous-discrete Lax equations are shown to be equivalent to a factorization
problem as well as to a set of string equations. A congruence method to derive
site independent equations is presented and used to derive equations in the
discrete multicomponent KP sector (and also for its modification) of the theory
as well as dispersive Whitham equations.


title:
A simple variational principle for classical spinning particle with
  anomalous magnetic momentum

abstract:
  We obtain Bargmann-Michel-Telegdi equations of motion of classical spinning
particle using Lagrangian variational principle with Grassmann variables.


title: The Ricci flow does not preserve the set of Zoll metrics

abstract:
  The question of whether or not the set of Zoll metrics on the 2-sphere is
connected is still open. Here we show that a naive application of the Ricci
flow is not sufficient to answer this problem.


title: Slicely Countably Determined Banach spaces

abstract:
  We introduce the class of slicely countably determined Banach spaces which
contains in particular all spaces with the RNP and all spaces without copies of
$\ell_1$. We present many examples and several properties of this class. We
give some applications to Banach spaces with the Daugavet and the alternative
Daugavet properties, lush spaces and Banach spaces with numerical index 1. In
particular, we show that the dual of a real infinite-dimensional Banach with
the alternative Daugavet property contains $\ell_1$ and that operators which do
not fix copies of $\ell_1$ on a space with the alternative Daugavet property
satisfy the alternative Daugavet equation.


title: The 85$Rb(p,n)85Sr reaction and the modified proton optical potential

abstract:
  The cross sections of the astrophysically relevant 85$Rb(p,n)85Srg,m reaction
have been measured between Ec.m. = 2.16 and 3.96 MeV. The cross sections have
been derived by measuring the gamma radiation following the beta decay of the
reaction products. A comparison with the predictions of Hauser-Feshbach
calculations using the NON-SMOKER code confirms a recently derived modification
of the global optical proton potential.


title: Harmonic maps and Kaluza-Klein metrics on spheres

abstract:
  This article studies the harmonicity of vector fields on Riemannian
manifolds, viewed as maps into the tangent bundle equipped with a family of
Riemannian metrics. Geometric and topological rigidity conditions are obtained,
especially for surfaces and vector fields of constant norm, and existence is
proved on two-tori. Classifications are given for conformal, quadratic and
Killing vector fields on spheres. Finally, the class of metric considered on
the tangent bundle is enlarged, permitting new vector fields to become
harmonic.


title:
On the mean density of complex eigenvalues for an ensemble of random
  matrices with prescribed singular values

abstract:
  Given any fixed $N \times N$ positive semi-definite diagonal matrix $G\ge 0$
we derive the explicit formula for the density of complex eigenvalues for
random matrices $A$ of the form $A=U\sqrt{G}$} where the random unitary
matrices $U$ are distributed on the group $\mathrm{U(N)}$ according to the Haar
measure.


title: Subnanosecond single electron source in the time-domain

abstract:
  We describe here the realization of a single electron source similar to
single photon sources in optics. On-demand single electron injection is
obtained using a quantum dot connected to the conductor via a tunnel barrier of
variable transmission (quantum point contact). Electron emission is triggered
by a sudden change of the dot potential which brings a single energy level
above the Fermi energy in the conductor. A single charge is emitted on an
average time ranging from 100 ps to 10 ns ultimately determined by the barrier
transparency and the dot charging energy. The average single electron emission
process is recorded with a 0.5 ns time resolution using a real-time fast
acquisition card. Single electron signals are compared tosimulation based on
scattering theory approach adapted for finite excitation energies.


title:
New distance and depth estimates from observations of eclipsing binaries
  in the SMC

abstract:
  A sample of 33 eclipsing binaries observed in a field of the SMC with
FLAMES@VLT is presented. The radial velocity curves obtained, together with
existing OGLE light curves, allowed the determination of all stellar and
orbital parameters of these binary systems. The mean distance modulus of the
observed part of the SMC is 19.05, based on the 26 most reliable systems.
Assuming an average error of 0.1 mag on the distance modulus to an individual
system, and a gaussian distribution of the distance moduli, we obtain a 2-sigma
depth of 0.36 mag or 10.6 kpc. Some results on the kinematics of the binary
stars and of the H II gas are also given.


title: Remarques sur les spineurs de Killing transversaux

abstract:
  We show necessary conditions for the existence of transversal Killing spinors
on a spin manifold endowed with a Riemannian flow.


title: SWIM: A Simple Model to Generate Small Mobile Worlds

abstract:
  This paper presents small world in motion (SWIM), a new mobility model for
ad-hoc networking. SWIM is relatively simple, is easily tuned by setting just a
few parameters, and generates traces that look real--synthetic traces have the
same statistical properties of real traces. SWIM shows experimentally and
theoretically the presence of the power law and exponential decay dichotomy of
inter-contact time, and, most importantly, our experiments show that it can
predict very accurately the performance of forwarding protocols.


title: p(x)-Harmonic functions with unbounded exponent in a subdomain

abstract:
  We study the Dirichlet problem $-\div(|\nabla u|^{p(x)-2} \nabla u) =0 $ in
$\Omega$, with $u=f$ on $\partial \Omega$ and $p(x) = \infty$ in $D$, a
subdomain of the reference domain $\Omega$. The main issue is to give a proper
sense to what a solution is. To this end, we consider the limit as $n \to
\infty$ of the solutions $u_n$ to the corresponding problem when $p_n(x) =p(x)
\wedge n$, in particular, with $p_n = n$ in $D$. Under suitable assumptions on
the data, we find that such a limit exists and that it can be characterized as
the unique solution of a variational minimization problem which is, in
addition, $\infty$-harmonic within $D$. Moreover, we examine this limit in the
viscosity sense and find the boundary value problem it satisfies in the whole
of $\Omega$.


title:
Spin fluctuations in the magnetically ordered phase of frustrated
  pyrochlore systems

abstract:
  Two geometrically frustrated pyrochlore stannates, undergoing long range
magnetic order below 1K, were investigated at very low temperature. Anomalies
in the behaviour of hyperfine quantities are found, by 155Gd Mossbauer
spectroscopy in Gd2Sn2O7 and by low temperature specific heat measurements in
Tb2Sn2O7. They are interpreted in terms of fluctuations of the correlated Gd or
Tb spins, using a model two-level system (the nuclear spins) submitted to a
randomly fluctuating (hyperfine) field.


title: Spin-Statistics Violations in Superstring Theory

abstract:
  I describe how superstring theory may violate spin-statistics in an
experimentally observable manner. Reviewing the basics of superstring
interactions and how to utilize these to produce a statistical phase, I then
apply these ideas to two specific examples. The first is the case of heterotic
worldsheet linkings, whereby one small closed string momentarily enlarges
sufficiently to pass over another, producing such a statistical phase. The
second is the braneworld model with noncommutative geometry, whereby matter
composed of open strings may couple to a background in which spacetime
coordinates do not commute, modifying the field (anti)commutator algebra. I
conclude with ways to sharpen and experimentally test these exciting avenues to
possibly verify superstring theory.


title: Boundary Lax pairs for the $A_{n}^{(1)}$ Toda field theories

abstract:
  Based on the recent formulation of a general scheme to construct boundary Lax
pairs,we develop this systematic construction for the $A_n^{(1)}$ affine Toda
field theories (ATFT). We work out explicitly the first two models of the
hierarchy, i.e. the sine-Gordon ($A_1^{(1)}$) and the $A_2^{(1)}$ models. The
$A_2^{(1)}$ Toda theory is the first non-trivial example of the hierarchy that
exhibits two distinct types of boundary conditions. We provide here novel
expressions of boundary Lax pairs associated to both types of boundary
conditions.


title:
Modified action and differential operators on the 3-D sub-Riemannian
  sphere

abstract:
  Our main aim is to present a geometrically meaningful formula for the
fundamental solutions to a second order sub-elliptic differential equation and
to the heat equation associated with a sub-elliptic operator in the
sub-Riemannian geometry on the unit sphere $\mathbb S^3$. Our method is based
on the Hamiltonian approach, where the corresponding Hamitonian system is
solved with mixed boundary conditions. A closed form of the modified action is
given. It is a sub-Riemannian invariant and plays the role of a distance on
$\mathbb S^3$.


title: Winding expansion techniques for lattice QCD with chemical potential

abstract:
  We analytically derive a decomposition of the lattice fermion determinant for
Wilson's Dirac operator with chemical potential into winding sectors, i.e.,
factors with a fixed number of quarks. Dividing the lattice into four domains,
the determinant is factorized into terms which can be classified with respect
to the winding number of the closed loops they consist of. The individual
factors are expressed in terms of subdeterminants and propagators on the
domains of the lattice. We numerically analyze properties of the factorization
formula and discuss two applications for the determination of canonical
partition functions with a fixed quark number: A speedup for the Fourier
transformation technique through a dimensional reduction, and a power series
expansion.


title: DNA-based tunable THz oscillator

abstract:
  The intrinsic double helix conformation of the DNA strands is known to be the
key ingredient of control of the electric current through the DNA by the
perpendicular (gate) electric field. We show theoretically that Bloch
oscillations in the DNA are also strongly affected by such lateral field; the
oscillation frequency splits into a manifold of several generally
non-commensurate frequencies leading to a complicated pattern of the charge
motion. The frequency of the oscillations falls in the THz domain, providing
for a possibility to design a nano-scale source of THz radiation.


title:
McKay correspondence for the Poincar\'e series of Kleinian and Fuchsian
  singularities

abstract:
  We give a conceptual proof that the Poincar\'e series of the coordinate
algebra of a Kleinian singularity and of a Fuchsian singularity of genus 0 is
the quotient of the characteristic polynomials of two Coxeter elements. These
Coxeter elements are interpreted geometrically, using triangulated categories
and spherical twist functors.


title: Dynamics of vertex-reinforced random walks

abstract:
  We generalize a result from Volkov [Ann. Probab. 29 (2001) 66--91] and prove
that, on a large class of locally finite connected graphs of bounded degree
$(G,\sim)$ and symmetric reinforcement matrices $a=(a_{i,j})_{i,j\in G}$, the
vertex-reinforced random walk (VRRW) eventually localizes with positive
probability on subsets which consist of a complete $d$-partite subgraph with
possible loops plus its outer boundary. We first show that, in general, any
stable equilibrium of a linear symmetric replicator dynamics with positive
payoffs on a graph $G$ satisfies the property that its support is a complete
$d$-partite subgraph of $G$ with possible loops, for some $d\ge1$. This result
is used here for the study of VRRWs, but also applies to other contexts such as
evolutionary models in population genetics and game theory. Next we generalize
the result of Pemantle [Probab. Theory Related Fields 92 (1992) 117--136] and
Bena\"{{\i}}m [Ann. Probab. 25 (1997) 361--392] relating the asymptotic
behavior of the VRRW to replicator dynamics. This enables us to conclude that,
given any neighborhood of a strictly stable equilibrium with support $S$, the
following event occurs with positive probability: the walk localizes on
$S\cup\partial S$ (where $\partial S$ is the outer boundary of $S$) and the
density of occupation of the VRRW converges, with polynomial rate, to a
strictly stable equilibrium in this neighborhood.


title:
VLBI observations of jupiter with the initial test station of LOFAR and
  the nancay decametric array

abstract:
  AIMS: To demonstrate and test the capability of the next generation of
low-frequency radio telescopes to perform high resolution observations across
intra-continental baselines. Jupiter's strong burst emission is used to perform
broadband full signal cross-correlations on time intervals of up to hundreds of
milliseconds. METHODS: Broadband VLBI observations at about 20 MHz on a
baseline of ~50000 wavelengths were performed to achieve arcsecond angular
resolution. LOFAR's Initial Test Station (LOFAR/ITS, The Netherlands) and the
Nancay Decametric Array (NDA, France) digitize the measured electric field with
12 bit and 14 bit in a 40 MHz baseband. The fine structure in Jupiter's signal
was used for data synchronization prior to correlation on the time-series data.
RESULTS: Strong emission from Jupiter was detected during snapshots of a few
seconds and detailed features down to microsecond time-scales were identified
in dynamic spectra. Correlations of Jupiter's burst emission returned strong
fringes on 1 ms time-scales over channels as narrow as a hundred kilohertz
bandwidth. CONCLUSIONS: Long baseline interferometry is confirmed at low
frequencies, in spite of phase shifts introduced by variations in ionospheric
propagation characteristics. Phase coherence was preserved over tens to
hundreds of milliseconds with a baseline of ~700 km. No significant variation
with time was found in the correlations and an estimate for the fringe
visibility of 1, suggested that the source was not resolved. The upper limit on
the source region size of Jupiter Io-B S-bursts corresponds to an angular
resolution of ~3 arcsec. Adding remote stations to the LOFAR network at
baselines up to thousand kilometers will provide 10 times higher resolution
down to an arcsecond.


title:
Topological field theories in n-dimensional spacetimes and Cartan's
  equations

abstract:
  Action principles of the BF type for diffeomorphism invariant topological
field theories living in n-dimensional spacetime manifolds are presented. Their
construction is inspired by Cuesta and Montesinos' recent paper where Cartan's
first and second structure equations together with first and second Bianchi
identities are treated as the equations of motion for a field theory. In
opposition to that paper, the current approach involves also auxiliary fields
and holds for arbitrary n-dimensional spacetimes. Dirac's canonical analysis
for the actions is detailedly carried out in the generic case and it is shown
that these action principles define topological field theories, as mentioned.
The current formalism is a generic framework to construct geometric theories
with local degrees of freedom by introducing additional constraints on the
various fields involved that destroy the topological character of the original
theory. The latter idea is implemented in two-dimensional spacetimes where
gravity coupled to matter fields is constructed out, which has indeed local
excitations.


title:
Direction identification in radio images of cosmic-ray air showers
  detected with LOPES and KASCADE

abstract:
  AIMS: We want to understand the emission mechanism of radio emission from air
showers to determine the origin of high-energy cosmic rays. Therefore, we study
the geometry of the air shower radio emission measured with LOPES and search
for systematic effects between the direction determined on the radio signal and
the direction provided by the particle detector array KASCADE. METHODS: We
produce 4D radio images on time-scales of nanoseconds using digital
beam-forming. Each pixel of the image is calculated for three spatial
dimensions and as a function of time. The third spatial dimension is obtained
by calculating the beam focus for a range of curvature radii fitted to the
signal wave front. We search this multi-dimensional parameter space for the
direction of maximum coherence of the air shower radio signal and compare it to
the direction provided by KASCADE. RESULTS: The maximum radio emission of air
showers is obtained for curvature radii being larger than 3 km. We find that
the direction of the emission maximum can change when optimizing the curvature
radius. Furthermore, we find a tentative increase of the curvature radius to
lower elevations, where the air showers pass through a larger atmospheric
depth. CONCLUSIONS: We conclude that the angular resolution of LOPES is
sufficient to determine the direction which maximizes the observed electric
field amplitude. However, the statistical uncertainty of the directions is not
determined by the resolution of LOPES, but by the uncertainty of the curvature
radius. We do not find any systematic deviation between the directions
determined from the radio signal and from the detected particles. This result
places a strong supportive argument for the use of the radio technique to study
the origin of high-energy cosmic rays.


title:
Mesospheric vertical thermal structure and winds on Venus from HHSMT CO
  spectral-line observations

abstract:
  We report vertical thermal structure and wind velocities in the Venusian
mesosphere retrieved from carbon monoxide (12CO J=2-1 and 13CO J=2-1) spectral
line observations obtained with the Heinrich Hertz Submillimeter Telescope
(HHSMT). We observed the mesosphere of Venus from two days after the second
Messenger flyby of Venus (on June 5 2007 at 23:10 UTC) during five days.
Day-to-day and day-to-night temperature variations and short-term fluctuations
of the mesospheric zonal flow were evident in our data. The extensive layer of
warm air detected recently by SPICAV at 90 - to 100 km altitude is also
detected in the temperature profiles reported here. These data were part of a
coordinated ground-based Venus observational campaign in support of the ESA
Venus Express mission. Furthermore, this study attempts to cross-calibrate
space- and ground-based observations, to constrain radiative transfer and
retrieval algorithms for planetary atmospheres, and to contribute to a more
thorough understanding of the global patterns of circulation of the Venusian
atmosphere.


title:
A simple model for NN correlations in quasielastic lepton-nucleus
  scattering

abstract:
  We present a covariant extension of the relativistic Fermi gas model which
incorporates correlation effects in nuclei. Within this model, inspired by the
BCS descriptions of systems of fermions, we obtain the nuclear spectral
function and from it the superscaling function for use in treating high-energy
quasielastic electroweak processes. Interestingly, this model has the
capability to yield the asymmetric tail seen in the experimental scaling
function.


title: Singlet fermionic dark matter as a natural higgs portal model

abstract:
  We propose a renormalizable model of a fermionic dark matter by introducing a
gauge singlet Dirac fermion and a real singlet scalar. The bridges between the
singlet sector and the standard model sector are only the singlet scalar
interaction terms with the standard model Higgs field. The singlet fermion
couples to the standard model particles through the mixing between the standard
model Higgs and singlet scalar and is naturally a weakly interacting massive
particle (WIMP). The measured relic abundance can be explained by the singlet
fermionic dark matter as the WIMP within this model. Collider implication of
the singlet fermionic dark matter is also discussed. Predicted is the elastic
scattering cross section of the singlet fermion into target nuclei for a direct
detection of the dark matter. Search of the direct detection of the dark matter
provides severe constraints on the parameters of our model.


title:
FUSE spectroscopy of sdOB primary of the post common-envelope binary LB
  3459 (AA Dor)

abstract:
  LB 3459 (AA Dor) is an eclipsing, close, post common-envelope binary
consisting of an sdOB primary star and an unseen secondary with an
extraordinarly low mass - formally a brown dwarf. A recent NLTE spectral
analysis shows a discrepancy with the surface gravity, which is derived from
analyses of radial-velocity and lightcurves. We aim at precisely determing of
the photospheric parameters of the primary, especially of the surface gravity,
and searching for weak metal lines in the far UV. We performed a detailed
spectral analysis of the far-UV spectrum of LB 3459 obtained with FUSE by means
of state-of-the-art NLTE model-atmosphere techniques.
  A strong contamination of the far-UV spectrum of LB 3459 by interstellar line
absorption hampers a precise determination of the photospheric properties of
its primary star. Its effective temperature (42 kK) was confirmed by the
evaluation of new ionization equilibria. For the first time, phosphorus and
sulfur have been identified in the spectrum of LB 3459. Their photospheric
abundances are solar and 0.01 times solar, respectively. From the C III
1174-1177A multiplet, we can measure the rotational velocity of 35 +/- 5 km/sec
of the primary of LB 3459 and confirm that the rotation is bound. From a
re-analysis of optical and UV spectra, we determine a higher log g = 5.3 (cgs)
that reduces the discrepancy in mass determination in comparison to analyses of
radial-velocity and lightcurves. However, the problem is not completely solved.


title: The magnetic environment in the central region of nearby galaxies

abstract:
  The central regions of galaxies harbor some of the most extreme physical
phenomena, including dense stellar clusters, non-circular motions of molecular
clouds and strong and pervasive magnetic field structures. In particular, radio
observations have shown that the central few hundred parsecs of our Galaxy has
a striking magnetic field configuration. It is not yet clear whether these
magnetic structures are unique to our Milky Way or a common feature of all
similar galaxies. Therefore, we report on (a) a new radio polarimetric survey
of the central 200 pc of the Galaxy to better characterize the magnetic field
structure and (b) a search for large-scale and organized magnetized structure
in the nuclear regions of nearby galaxies using data from the Very Large Array
(VLA) archive. The high angular resolution of the VLA allows us to study the
central 1 kpc of the nearest galaxies to search for magnetized nuclear features
similar to what is detected in our own Galactic center. Such magnetic features
play a important role in the nuclear regions of galaxies in terms of gas
transport and the physical conditions of the interstellar medium in this
unusual region of galaxies.


title:
Resonance solutions of the nonlinear Schr\"odinger equation in an open
  double-well potential

abstract:
  The resonance states and the decay dynamics of the nonlinear Schr\"odinger
(or Gross-Pitaevskii) equation are studied for a simple, however flexible model
system, the double delta-shell potential. This model allows analytical
solutions and provides insight into the influence of the nonlinearity on the
decay dynamics. The bifurcation scenario of the resonance states is discussed,
as well as their dynamical stability properties. A discrete approximation using
a biorthogonal basis is suggested which allows an accurate description even for
only two basis states in terms of a nonlinear, nonhermitian matrix problem.


title: Ruan's conjecture and integral structures in quantum cohomology

abstract:
  This is an expository article on the recent studies of Ruan's crepant
resolution/flop conjecture and its possible relations to the K-theory integral
structure in quantum cohomology.


title:
Interaction Effects in Conductivity of a Two-Valley Electron System in
  High-Mobility Si Inversion Layers

abstract:
  We have measured the conductivity of high-mobility (001) Si
metal-oxide-semiconductor field effect transistors (MOSFETs) over wide ranges
of electron densities n=(1.8-15)x10^11cm^2, temperatures T=30mK-4.2K, and
in-plane magnetic fields B=0-5T. The experimental data have been analyzed using
the theory of interaction effects in the conductivity of disordered 2D systems.
The parameters essential for comparison with the theory, such as the
intervalley scattering time and valley splitting, have been measured or
evaluated in independent experiments. The observed behavior of the
conductivity, including its quasi-linear increase with decreasing T down to
~0.4K and its downturn at lower temperatures, is in agreement with the theory.
The values of the Fermi- liquid parameter obtained from the comparison agree
with the corresponding values extracted from the analysis of Shubnikov-de Haas
oscillations based on the theory of magnetooscillations in interacting 2D
systems.


title:
Frequency spectra of cosmic ray air shower radio emission measured with
  LOPES

abstract:
  AIMS: We wish to study the spectral dependence of the radio emission from
cosmic-ray air showers around 100 PeV (1017 eV). METHODS: We observe short
radio pulses in a broad frequency band with the dipole-interferometer LOPES
(LOFAR Prototype Station), which is triggered by a particle detector array
named Karlsruhe Shower Core and Array Detector (KASCADE). LOFAR is the Low
Frequency Array. For this analysis, 23 strong air shower events are selected
using parameters from KASCADE. RESULTS: The resulting electric field spectra
fall off to higher frequencies. An average electric field spectrum is fitted
with an exponential, or alternatively, with a power law. The spectral slope
obtained is not consistent within uncertainties and it is slightly steeper than
the slope obtained from Monte Carlo simulations based on air showers simulated
with CORSIKA (Cosmic Ray Simulations for KASCADE). One of the strongest events
was measured during thunderstorm activity in the vicinity of LOPES and shows
the longest pulse length measured of 110 ns and a spectral slope of -3.6.
CONCLUSIONS: We show with two different methods that frequency spectra from air
shower radio emission can be reconstructed on event-by-event basis, with only
two dozen dipole antennae simultaneously over a broad range of frequencies.
According to the obtained spectral slopes, the maximum power is emitted below
40 MHz. Furthermore, the decrease in power to higher frequencies indicates a
loss in coherence determined by the shower disc thickness. We conclude that a
broader bandwidth, larger collecting area, and longer baselines, as will be
provided by LOFAR, are necessary to further investigate the relation of the
coherence, pulse length, and spectral slope of cosmic ray air showers.


title: $L^p$ continuity of wave operators in $\Bbb Z$

abstract:
  We recover for discrete Schr\"odinger operators on the lattice Z, stronger
analogues of the results by Weder, Galtabiar and Yajima and by D'Ancona and
Fanelli on R.


title: Engineering molecular aggregate spectra

abstract:
  We show that optical properties of linear molecular aggregates undergo
drastic changes when aggregates are deposited on a metal surface. The
dipole-dipole interactions of monomers with their images can result in strong
{re-structuring of both the exciton band and the absorption spectrum, depending
on the arrangement of the monomer transition dipoles with respect to the
surface.


title: Algorithmic information theory

abstract:
  We introduce algorithmic information theory, also known as the theory of
Kolmogorov complexity. We explain the main concepts of this quantitative
approach to defining `information'. We discuss the extent to which Kolmogorov's
and Shannon's information theory have a common purpose, and where they are
fundamentally different. We indicate how recent developments within the theory
allow one to formally distinguish between `structural' (meaningful) and
`random' information as measured by the Kolmogorov structure function, which
leads to a mathematical formalization of Occam's razor in inductive inference.
We end by discussing some of the philosophical implications of the theory.


title:
A one-parameter family of interpolating kernels for Smoothed Particle
  Hydrodynamics studies

abstract:
  A set of interpolating functions of the type f(v)={(sin[v pi/2])/(v pi/2)}^n
is analyzed in the context of the smoothed-particle hydrodynamics (SPH)
technique. The behaviour of these kernels for several values of the parameter n
has been studied either analytically as well as numerically in connection with
several tests carried out in two dimensions. The main advantage of this kernel
relies in its flexibility because for n=3 it is similar to the standard widely
used cubic-spline, whereas for n>3 the interpolating function becomes more
centrally condensed, being well suited to track discontinuities such as shock
fronts and thermal waves.


title: Stochastic Electron Acceleration in Shell-Type Supernova Remnants II

abstract:
  We discuss the generic characteristics of stochastic particle acceleration by
a fully developed turbulence spectrum and show that resonant interactions of
particles with high speed waves dominate the acceleration process. To produce
the relativistic electrons inferred from the broadband spectrum of a few
well-observed shell-type supernova remnants in the leptonic scenario for the
TeV emission, fast mode waves must be excited effectively in the downstream and
dominate the turbulence in the subsonic phase. Strong collisionless
non-relativistic astrophysical shocks are studied with the assumption of a
constant Aflven speed. The energy density of non-thermal electrons is found to
be comparable to that of the magnetic field. With reasonable parameters, the
model explains observations of shell-type supernova remnants. More detailed
studies are warranted to better understand the nature of supernova shocks.


title:
High-Resolution Neutron Capture and Total Cross-Section Measurements,
  and the Astrophysical 95Mo(n,gamma) Reaction Rate at s-process Temperatures

abstract:
  Abundances of Mo isotopes predicted by stellar models of the s process are,
except for 95Mo, in good agreement with data from single grains of mainstream
presolar SiC. Because the meteorite data seemed sound and no reasonable
modification to stellar theory resulted in good agreement for 95Mo, it has been
suggested that the recommended neutron capture reaction rate for this nuclide
is 30% too low. Therefore, we have made a new determination of the
95Mo(n,gamma) reaction rate via high-resolution measurements of the
neutron-capture and total cross sections of 95Mo at the Oak Ridge Electron
Linear Accelerator. These data were analyzed with the R-matrix code SAMMY to
obtain parameters for resonances up to En = 10 keV. Also, a small change to our
capture apparatus allowed us to employ a new technique to vastly improve
resonance spin and parity assignments. These new resonance parameters, together
with our data in the unresolved range, were used to calculate the 95Mo(n,gamma)
reaction rate at s-process temperatures. We compare the currently recommended
rate to our new results and discuss their astrophysical impact.


title: A lattice approach to model flow in cracked concrete

abstract:
  This paper presents a lattice approach to model the influence of cracking on
inviscid flow in concrete. A mechanical lattice model based on a
damage-plasticity constitutive model was combined with a new dual lattice of
conduit elements for flow analysis. The diffusivity of the conduit elements
depends on the crack-opening obtained from the mechanical lattice. The coupled
lattice model was applied to several benchmark tests for aligned and random
lattices. The results for mechanical loading and flow analysis obtained with
the new approach were shown to be independent of the size of lattice elements
used.


title: Neutrino oscillations beyond the Standard Model

abstract:
  We address the possible impact of New Physics on neutrino oscillation
experiments. This can modify the neutrino production, propagation and/or
detection, making the full cross section non-factorizable in general. Thus, for
example, the neutrino flux may not be properly described assuming an unitary
MNS matrix and/or neutrinos may propagate differently depending of their Dirac
or Majorana character. Interestingly enough, present limits on New Physics
still allow for observable effects at future neutrino experiments.


title: Supersymmetric partners of the trigonometric Poschl-Teller potentials

abstract:
  The first and second-order supersymmetry transformations are used to generate
Hamiltonians with known spectra departing from the trigonometric Poschl-Teller
potentials. The several possibilities of manipulating the initial spectrum are
fully explored, and it is shown how to modify one or two levels, or even to
leave the spectrum unaffected. The behavior of the new potentials at the
boundaries of the domain is studied.


title: Foliations with degenerate Gauss maps on $\mathbb P^4$

abstract:
  We obtain a classification of codimension one holomorphic foliations on
$\mathbb P^4$ with degenerate Gauss maps.


title: Non-Statistical Effects in Neutron Capture

abstract:
  There have been many reports of non-statistical effects in neutron-capture
measurements. However, reports of deviations of reduced-neutron-width
distributions from the expected Porter-Thomas (PT) shape largely have been
ignored. Most of these deviations have been reported for odd-A nuclides.
Because reliable spin (J) assignments have been absent for most resonances for
such nuclides, it is possible that reported deviations from PT might be due to
incorrect J assignments. We recently developed a new method for measuring spins
of neutron resonances by using the DANCE detector at LANSCE. Measurements made
with a 147Sm sample allowed us to determine spins of almost all known
resonances below 1 keV. Furthermore, analysis of these data revealed that the
reduced-neutron-width distribution was in good agreement with PT for resonances
below 350 eV, but in disagreement with PT for resonances between 350 and 700
eV. Our previous (n,alpha) measurements had revealed that the alpha strength
function also changes abruptly at this energy. There currently is no known
explanation for these two non-statistical effects. Recently, we have developed
another new method for determining the spins of neutron resonances. To
implement this technique required a small change (to record pulse-height
information for coincidence events) to a much simpler apparatus: A pair of C6D6
gamma-ray detectors which we have employed for many years to measure
neutron-capture cross sections at ORELA. Measurements with a 95Mo sample
revealed that not only does the method work very well for determining spins,
but it also makes possible parity assignments. Taken together, these new
techniques at LANSCE and ORELA could be very useful for further elucidation of
non-statistical effects.


title:
Zero Field precession and hysteretic threshold currents in spin torque
  oscillators with tilted polarizer

abstract:
  Using non-linear system theory and numerical simulations we map out the
static and dynamic phase diagram in zero applied field of a spin torque
oscillator with a tilted polarizer (TP-STO).We find that for sufficiently large
currents, even very small tilt angles (beta>1 degree) will lead to steady free
layer precession in zero field. Within a rather large range of tilt angles, 1
degree< beta <19 degree, we find coexisting static states and hysteretic
switching between these using only current. In a more narrow window (1
degree<beta<5 degree) one of the static states turns into a limit cycle
(precession). The coexistence of static and dynamic states in zero magnetic
field is unique to the tilted polarizer and leads to large hysteresis in the
upper and lower threshold currents for TP-STO operation.


title: Meson and di-electron production with HADES

abstract:
  The HADES experiment, installed at GSI, Darmstadt, measures di-electron
production in A+A, p/pi+N and p/pi+A collisions. Here, the pi0 and eta Dalitz
decays have been reconstructed in the exclusive p+p reaction at 2.2 GeV to form
a reference cocktail for long-lived di-electron sources. In the C+C reaction at
1 and 2 GeV/u, these long-lived sources have been subtracted from the measured
inclusive e+e- yield to exhibit the signal from the early phase of the
collision. The results suggest that resonances play an important role in dense
nuclear matter.


title: La-dilution effects in TbRhIn5 antiferromagnet

abstract:
  We report measurements of temperature dependent magnetic susceptibility,
resonant x-ray magnetic scattering (XRMS) and heat capacity on single crystals
of Tb1-xLaxRhIn5 for nominal concentrations in the range 0.0 < x < 1.0. TbRhIn5
is an antiferromagnetic (AFM) compound with TN ~ 46 K, which is the highest TN
values along the RRhIn5 series. We explore the suppression of the
antiferromagnetic (AFM) state as a function of La-doping considering the
effects of La-induced dilution and perturbations to the tetragonal crystalline
electrical field (CEF) on the long range magnetic interaction between the
Tb$^{3+}$ ions. Additionally, we also discuss the role of disorder. Our results
and analysis are compared to the properties of the undoped compound and of
other members of the RRhIn5 family and structurally related compounds (R2RhIn8
and RIn3). The XRMS measurements reveal that the commensurate magnetic
structure with the magnetic wave-vector (0,1/2,1/2) observed for the undoped
compound is robust against doping perturbations in Tb0.6La0.4RhIn5 compound.


title: Design of Energy Scavengers Mounted on Rotating Shafts

abstract:
  In this paper, a novel energy scavenger is proposed. The scavenger consists
of a cantilever beam on which piezoelectric films and a mass are mounted. The
mass at the tip of the beam is known as the proof mass and the device is called
either an energy scavenger or a beam-mass system. The beam-mass system is
mounted on a rotating shaft, where the axis of the shaft is horizontal. A
single-degree-of-freedom (SDOF) mathematical model is derived for the scavenger
and its properties are carefully examined. From the model, it becomes clear
that the rotation of the shaft and gravity cause both parametric excitations
and exogenous forces which make the beam-mass system vibrate. Guidelines are
provided as how to choose the scavenger parameters in order to have it
resonate. Examples are given to illustrate the performance of the proposed
scavenger.


title: New supersymmetric quartet of nuclei: 192Os, 193Os, 193Ir, 194Ir

abstract:
  We present evidence of the existence of a new supersymmetric quartet of
nuclei in the A=190 mass region. The analysis is based on new experimental
information on the odd-odd nucleus 194Ir from transfer and capture reactions.
The new data allow the identification of a new supersymmetric quartet,
consisting of the 192,193Os and 193,194Ir nuclei. We make explicit predictions
fo r193Os, and suggest that its spectroscopic properties be measured in
dedicated experiments. Finally, we study correlations between different
transfer reactions.


title: Hubs and Clusters in the Evolving U. S. Internal Migration Network

abstract:
  Most nations of the world periodically publish N x N origin-destination
tables, recording the number of people who lived in geographic subdivision i at
time t and j at t+1. We have developed and widely applied to such national
tables and other analogous (weighted, directed) socioeconomic networks, a
two-stage--double-standardization and (strong component) hierarchical
clustering--procedure. Previous applications of this methodology and related
analytical issues are discussed. Its use is illustrated in a large-scale study,
employing recorded United States internal migration flows between the 3,000+
county-level units of the nation for the periods 1965-1970 and 1995-2000.
Prominent, important features--such as ''cosmopolitan hubs'' and ``functional
regions''--are extracted from master dendrograms. The extent to which such
characteristics have varied over the intervening thirty years is evaluated.

categories: physics.soc-ph cs.SI physics.data-an stat.AP


title:
Single-hit criterion in DAMA/LIBRA DM search and daemons - they are
  anything but weakly interacting

abstract:
  Our prediction that the more massive DAMA/LIBRA detector would detect a
smaller number of events per unit of mass and time than the DAMA/NaI system has
got confirmation. This is easy to understand, because DM objects are by far not
the WIMPs of the Galactic halo that interact only weakly with matter but are
apparently instead electrically charged Planckian objects, i.e., daemons which
fall from Earth-crossing orbits with V = 30-50 km/s and undergo multiple
interaction with condensed matter already in its outer layers, on a path of a
few tens of cm. Therefore, one should use not compact massive detectors but
rather systems with a large surface area, as we did to detect daemons with thin
ZnS(Ag) scintillators. There are grounds to believe that correct use of the
single-hit criterion in LIBRA should reveal DM particles with V = 30-50 km/s,
and subsequently, with V = 10-15 km/s as well.


title: Magnetic dipole moment of the electron

abstract:
  We present a model which determines the correct value of the magnetic dipole
moment of the electron. By this, we find a physical meaning for the electron
spin.


title: Tuning the exciton g-factor in single InAs/InP quantum dots

abstract:
  Photoluminescence data from single, self-assembled InAs/InP quantum dots in
magnetic fields up to 7 T are presented. Exciton g-factors are obtained for
dots of varying height, corresponding to ground state emission energies ranging
from 780 meV to 1100 meV. A monotonic increase of the g-factor from -2 to +1.2
is observed as the dot height decreases. The trend is well reproduced by sp3
tight binding calculations, which show that the hole g-factor is sensitive to
confinement effects through orbital angular momentum mixing between the
light-hole and heavy-hole valence bands. We demonstrate tunability of the
exciton g-factor by manipulating the quantum dot dimensions using pyramidal InP
nanotemplates.


title: Polarimetry from the Ground Up

abstract:
  Ground-based solar polarimetry has made great progress over the last decade.
Nevertheless, polarimetry is still an afterthought in most telescope and
instrument designs, and most polarimeters are designed based on experience and
rules of thumb rather than using more formal systems engineering approaches as
is common in standard optical design efforts. Here we present the first steps
in creating a set of systems engineering approaches to the design of
polarimeters that makes sure that the final telescope-instrument-polarimeter
system is more than the sum of its parts.


title: On the $q$-Bessel Fourier transform

abstract:
  In this work, we are interested by the $q$-Bessel Fourier transform with a
new approach. Many important results of this $q$-integral transform are proved
with a new constructive demonstrations and we establish in particular the
associated $q$-Fourier-Neumen expansion which involves the $q$-little Jacobi
polynomials.


title:
On Elkies subgroups of l-torsion points in elliptic curves defined over
  a finite field

abstract:
  As a subproduct of the Schoof-Elkies-Atkin algorithm to count points on
elliptic curves defined over finite fields of characteristic p, there exists an
algorithm that computes, for l an Elkies prime, l-torsion points in an
extension of degree l-1 at cost O(l max(l, \log q)^2) bit operations in the
favorable case where l < p/2.
  We combine in this work a fast algorithm for computing isogenies due to
Bostan, Morain, Salvy and Schost with the p-adic approach followed by Joux and
Lercier to get for the first time an algorithm valid without any limitation on
l and p but of similar complexity.


title:
Energy landscape of ubiquitin modulated by periodic forces: Asymmetric
  protein stability and shifts in unfolding pathways

abstract:
  Biological forces govern essential cellular and molecular processes in all
living organisms. Many cellular forces, e.g. those generated in cyclic
conformational changes of biological machines, have repetitive components.
However, little is known about how proteins process repetitive mechanical
stresses. To obtain first insights into dynamic protein mechanics, we probed
the mechanical stability of single and multimeric ubiquitins perturbed by
periodic forces. Using coarse-grained molecular dynamics simulations, we were
able to model repetitive forces with periods about two orders of magnitude
longer than the relaxation time of folded ubiquitins. We found that even a
small periodic force weakened the protein and shifted its unfolding pathways in
a frequency- and amplitude-dependent manner. Our results also showed that the
dynamic response of even a small protein can be complex with transient
refolding of secondary structures and an increasing importance of local
interactions in asymmetric protein stability. These observations were
qualitatively and quantitatively explained using an energy landscape model and
discussed in the light of dynamic single-molecule measurements and
physiological forces. We believe that our approach and results provide first
steps towards a framework to better understand dynamic protein biomechanics and
biological force generation.


title: Bounds on the frequency of 1 in the Kolakoski word

abstract:
  We use a method of Goulden and Jackson to bound freq_1(K), the limiting
frequency of 1 in the Kolakoski word K. We prove that |freq_1(K) - 1/2| <=
17/762, assuming the limit exists, and establish the semi-rigorous bound
|freq_1(K) - 1/2| <= 1/46.


title: How to extract information from Green's functions in Landau gauge

abstract:
  The infrared behavior of gluon and ghost propagators offers a crucial test of
confinement scenarios in Yang-Mills theories. A nonperturbative study of these
propagators from first principles is possible in lattice simulations, but one
must consider significantly large lattice sizes in order to approach the
infrared limit. We propose constraints based on general properties of the
propagators to gain control over the extrapolation of data to the
infinite-volume limit. These bounds also provide a way to relate the
propagators to simpler, more intuitive quantities. We apply our analysis to the
case of pure SU(2) gauge theory in Landau gauge, using the largest lattice
sizes to date. Our results seem to contradict commonly accepted confinement
scenarios. We argue that it is not so.


title: Phase Transitions and Moduli Space Topology

abstract:
  By means of an appropriate re-scaling of the metric in a Lagrangian, we are
able to reduce it to a kinetic term only. This form enables us to examine the
extended complexified solution set (complex moduli space) of field theories by
finding all possible geodesics of this metric. This new geometrical standpoint
sheds light on some foundational issues of QFT and brings to the forefront
non-perturbative core aspects of field theory. In this process, we show that
different phases of the theory are topologically inequivalent, i.e., their
moduli space has distinct topologies. Moreover, the different phases are
related by "duality transformations", which are established by the modular
structure of the theory. In conclusion, after the topological structure is
elucidated, it is possible to use the Euler Characteristic in order to
topologically quantize the theory, in resonance with the content of the
Atiyah-Singer Index theorem.


title:
Instability of anisotropic cosmological solutions supported by vector
  fields

abstract:
  Models with vector fields acquiring a non-vanishing vacuum expectation value
along one spatial direction have been proposed to sustain a prolonged stage of
anisotropic accelerated expansion. Such models have been used for realizations
of early time inflation, with a possible relation to the large scale CMB
anomalies, or of the late time dark energy. We show that, quite generally, the
concrete realizations proposed so far are plagued by instabilities (either
ghosts, or unstable growth of the linearized perturbations) which can be
ultimately related to the longitudinal vector polarization present in them.
Phenomenological results based on these models are therefore unreliable.


title: Large Scale Structure traced by Molecular Gas at High Redshift

abstract:
  We present observations of redshifted CO(1-0) and CO(2-1) in a field
containing an overdensity of Lyman break galaxies (LBGs) at z=5.12. Our
Australia Telescope Compact Array observations were centered between two
spectroscopically-confirmed z=5.12 galaxies. We place upper limits on the
molecular gas masses in these two galaxies of M(H_2) <1.7 x 10^10 M_sun and
<2.9 x 10^9 M_sun (2 sigma), comparable to their stellar masses. We detect an
optically-faint line emitter situated between the two LBGs which we identify as
warm molecular gas at z=5.1245 +/- 0.0001. This source, detected in the CO(2-1)
transition but undetected in CO(1-0), has an integrated line flux of 0.106 +/-
0.012 Jy km/s, yielding an inferred gas mass M(H_2)=(1.9 +/- 0.2) x 10^10
M_sun. Molecular line emitters without detectable counterparts at optical and
infrared wavelengths may be crucial tracers of structure and mass at high
redshift.


title:
The Least Luminous Galaxy: Spectroscopy of the Milky Way Satellite Segue
  1

abstract:
  We present Keck/DEIMOS spectroscopy of Segue 1, an ultra-low luminosity (M_V
= -1.5) Milky Way satellite companion. While the combined size and luminosity
of Segue 1 are consistent with either a globular cluster or a dwarf galaxy, we
present spectroscopic evidence that this object is a dark matter-dominated
dwarf galaxy. We identify 24 stars as members of Segue 1 with a mean
heliocentric recession velocity of 206 +/- 1.3 kms. We measure an internal
velocity dispersion of 4.3+/-1.2 kms. Under the assumption that these stars are
in dynamical equilibrium, we infer a total mass of 4.5^{+4.7}_{-2.5} x 10^5
Msun in the case where mass-follow-light; using a two-component maximum
likelihood model, we determine a similar mass within the stellar radius of 50
pc. This implies a mass-to-light ratio of ln(M/L_V) = 7.2^{+1.1}_{-1.2} or
M/L_V = 1320^{+2680}_{-940}. The error distribution of the mass-to-light ratio
is nearly log-normal, thus Segue 1 is dark matter-dominated at a high
significance. Using spectral synthesis modeling, we derive a metallicity for
the single red giant branch star in our sample of [Fe/H]=-3.3 +/- 0.2 dex.
Finally, we discuss the prospects for detecting gamma-rays from annihilation of
dark matter particles and show that Segue 1 is the most promising satellite for
indirect dark matter detection. We conclude that Segue 1 is the least luminous
of the ultra-faint galaxies recently discovered around the Milky Way, and is
thus the least luminous known galaxy.


title: Puzzling X-rays from the new colliding wind binary WR65

abstract:
  We report the discovery of variability in the X-ray emission from the
Wolf-Rayet type star WR 65. Using archival Chandra data spanning over 5 yr we
detect changes of the X-ray flux by a factor of 3 accompanied by changes in the
X-ray spectra. We believe that this X-ray emission originates from wind-wind
collision in a massive binary system. The observed changes can be explained by
the variations in the emission measure of the hot plasma, and by the different
absorption column along the binary orbit. The X-ray spectra of WR 65 display
prominent emission features at wavelengths corresponding to the lines of
strongly ionized Fe, Ca, Ar, S, Si, and Mg. WR 65 is a carbon rich WC9d star
that is a persistent dust maker. This is the first investigation of any X-ray
spectrum for a star of this spectral type. There are indications that the dust
and the complex geometry of the colliding wind region are pivotal in explaining
the X-ray properties of WR 65.


title: High mass-to-light ratios of UCDs - Evidence for dark matter ?

abstract:
  Ultra-compact dwarf galaxies (UCDs) are stellar systems with masses of around
10^7 to 10^8 Msun and half mass radii of 10-100 pc. They have some properties
in common with massive globular clusters, however dynamical mass estimates have
shown that UCDs have mass-to-light ratios which are on average about twice as
large than those of globular clusters at comparable metallicity, and tend to be
larger than what one would expect for old stellar systems with standard mass
functions.
  One possible explanation for elevated high mass-to-light ratios in UCDs is
the existence of a substantial amount of dark matter, which could have ended up
in UCDs if they are the remnant nuclei of tidally stripped dwarf galaxies.
Tidal stripping of dwarf galaxies has also been suggested has the origin of
several massive globular clusters like Omega Cen, in which case globular
clusters could have also formed with substantial amounts of dark matter.
  In this paper, we present collisional N-body simulations which study the
co-evolution of a system composed out of stars and dark matter. We find that
the dark matter gets removed from the central regions of such systems due to
dynamical friction and mass segregation of stars. The friction timescale is
significantly shorter than a Hubble time for typical globular clusters, while
most UCDs have friction times much longer than a Hubble time. Therefore, a
significant dark matter fraction remains within the half-mass radius of
present-day UCDs, making dark matter a viable explanation for the elevated M/L
ratios of UCDs. If at least some globular clusters formed in a way similar to
UCDs, we predict a substantial amount of dark matter in their outer parts.


title: Sflavor mixing map viewed from a high scale in supersymmetric SU(5)

abstract:
  We study flavor violation in a supersymmetric SU(5) grand unification
scenario in a model-independent way employing mass insertions. We examine how
the quark and the lepton sector observables restrict sfermion mixings. With a
low soft scalar mass, a lepton flavor violating process provides a stringent
constraint on the flavor structure of right-handed down-type squarks. In
particular, mu -> e gamma turns out to be highly susceptible to the 1-3 and 2-3
mixings thereof, due to the radiative correction from the top Yukawa coupling
to the scalar mass terms of 10. With a higher scalar mass around the optimal
value, in contrast, the quark sector inputs such as B-meson mixings and hadron
electric dipole moment, essentially determine the room for sfermion mixing. We
also discuss the recent deviation observed in B_s mixing phase, projected
sensitivity of forthcoming experiments, and ways to maintain the power of
leptonic restrictions even after incorporating a solution to fix the incorrect
quark-lepton mass relations.


title:
Disk Evolution and Bar Triggering Driven by Interactions with Dark
  Matter Substructure

abstract:
  We study formation and evolution of bar-disk systems in fully self-consistent
cosmological simulations of galaxy formation in the LCDM WMAP3 Universe. In a
representative model we find that the first generation of bars form in response
to the asymmetric dark matter (DM) distribution (i.e., DM filament) and quickly
decay. Subsequent bar generations form and are destroyed during the major
merger epoch permeated by interactions with a DM substructure (subhalos). A
long-lived bar is triggered by a tide from a subhalo and survives for ~10 Gyr.
The evolution of this bar is followed during the subsequent numerous minor
mergers and interactions with the substructure. Together with intrinsic
factors, these interactions largely determine the stellar bar evolution. The
bar strength and its pattern speed anticorrelate, except during interactions
and when the secondary (nuclear) bar is present. For about 5 Gyr bar pattern
speed increases substantially despite the loss of angular momentum to stars and
cuspy DM halo. We analyze the evolution of stellar populations in the bar-disk
and relate them to the underlying dynamics. While the bar is made mainly of an
intermediate age, ~5-6 Gyr, disk stars at z=0, a secondary nuclear bar which
surfaces at z~0.1 is made of younger, ~1-3 Gyr stars.


title:
Revisiting the effect of H2, HD and LiH molecules in the cooling of
  primordial gas

abstract:
  We use a non-equilibrium chemical network to revisit and study the effect of
H_{2}, HD and LiH molecular cooling on a primordial element of gas. We solve
both the thermal and chemical equations for a gas element with an initial
temperature T\approx 1000K and a gas number density in the range
n_{tot}=1-10^{4} cm^{-3}. At low densities, n_{tot}<10^{2} cm^{-3}, the gas
reaches temperatures \sim 100K and the main coolant is H_{2}, but at higher
densities, n_{tot}>10^{2} cm^{-3}, the HD molecule dominates the gas
temperature evolution. The effect of LiH is negligible in all cases. We studied
the effect of D abundance on the gas cooling. The D abundance was set initially
to be in the range n_{D}/n_{H}=10^{-7}-10^{-4.5}, with
n_{HD}/n_{H}={D^{+}}/n_{H}=10^{-10}. The simulations show that at
n_{tot}>10^{2} cm^{-3} the HD cooling dominates the temperature evolution for D
abundances greater than 10^{-5}n_{H}. This number decrease at higher densities.
Furthermore, we studied the effect of electrons and ionized particules on the
gas temperature. We followed the gas temperature evolution with
n_{H_{+}}/n_{H}=10^{-4}-10^{-1} and n_{D^{+}}/n_{H^{+}}=10^{-5}. The gas
temperature reached lower values at high ionization degree because electrons,
H^{+} and D^{+} are catalizers in the formation paths of the H_{2} and HD
molecules, which are the main coolers at low temperatures. Finaly, we studied
the effect of an OB star, with T_{eff}=4\times 10^{4}K, would have on gas
cooling. It is very difficult for a gas with n_{tot} in the range between 1-100
cm^{-3} to drop its temperature if the star is at a distance less than 100 pc.


title:
Wilson loops in 3-dimensional N=6 supersymmetric Chern-Simons Theory and
  their string theory duals

abstract:
  We study Wilson loops in the three-dimensional N=6 supersymmetric
Chern-Simons theory recently constructed by Aharony, Bergman, Jafferis and
Maldacena, that is conjectured to be dual to type IIA string theory on AdS_4 x
CP^3. We construct loop operators in the Chern-Simons theory which preserve 1/6
of the supercharges and calculate their expectation value up to 2-loop order at
weak coupling. The expectation value at strong coupling is found by
constructing the string theory duals of these operators. For low dimensional
representations these are fundamental strings, for high dimensional
representations these are D2-branes and D6-branes. In support of this
identification we demonstrate that these string theory solutions match the
symmetries, charges and the preserved supersymmetries of their Chern-Simons
theory counterparts.


title: Discrete and continuous symmetries in multi-Higgs-doublet models

abstract:
  We consider the Higgs sector of multi-Higgs-doublet models in the presence of
simple symmetries relating the various fields. We construct basis invariant
observables which may in principle be used to detect these symmetries for any
number of doublets. A categorization of the symmetries into classes is
required, which we perform in detail for the case of two and three Higgs
doublets.


title: AdS4/CFT3+Gravity for Accelerating Conical Singularities

abstract:
  We study the quantum-mechanical corrections to two point particles
accelerated by a strut in a 2+1 D flat background. Since the particles are
accelerating, we use finite temperature techniques to compute the Green's
function of a conformally coupled scalar applying transparent and Dirichlet
boundary conditions at the location of the strut. We find that the induced
energy-momentum tensor diverges at the position of the strut unless we impose
transparent boundary conditions. Further, we use the regular form of the
induced energy-momentum tensor to calculate the gravitational backreaction on
the original space. The resulting metric is a constant $\phi$ section of the
4-dimensional C-metric, and it describes two black holes corrected by weakly
coupled CFT and accelerating in asymptotically flat spacetime. Interestingly
enough, the same form of the metric was obtained before in 0803.2242 by cutting
the AdS C-metric with angular dependent critical 2-brane. According to
AdS/CFT+gravity conjecture, the latter should describe strongly coupled CFT
black holes accelerating on the brane. The presence of the CFT at finite
temperature gives us a unique opportunity to study the AdS/CFT+gravity
conjecture at finite temperatures. We calculate various thermodynamic
parameters to shed light on the nature of the strongly coupled CFT. This is the
first use of the duality in a system containing accelerating particles on the
brane.


title:
The Redshift Evolution of the Tully-Fisher Relation as a Test of
  Modified Gravity

abstract:
  The redshift evolution of the Tully-Fisher Relation probes gravitational
dynamics that must be consistent with any modified gravity theory seeking to
explain the galactic rotation curves without the need for dark matter. Within
the context of non-relativistic Modified Newtonian Dynamics (MOND), the
characteristic acceleration scale of the theory appears to be related to the
current value of either the Hubble constant, i.e., alpha ~ cH_0, or the dark
energy density, i.e., alpha (8 pi G rho_lambda/3)^{1/2}. If these relations are
the manifestation of a fundamental coupling of a_0 to either of the two
cosmological parameters, the cosmological evolution would then dictate a
particular dependence of the MOND acceleration scale with redshift that can be
tested with Tully-Fisher relations of high-redshift galaxies. We compare this
prediction to two sets of Tully-Fisher data with redshifts up to z=1.2. We find
that both couplings are excluded within the formal uncertainties. However, when
we take into account the potential systematic uncertainties in the data, we
find that they marginally favor the coupling of the MOND acceleration scale to
the density of dark energy.


title:
Implications of the discovery of a Higgs triplet on electroweak
  right-handed neutrinos

abstract:
  Electroweak scale active right-handed neutrinos such as those proposed in a
recent model necessitate the enlargement of the SM Higgs sector to include
Higgs triplets with doubly charged scalars. The search for and constraints on
such Higgs sector has implications not only on the nature of the electroweak
symmetry breaking but also on the possibility of testing the seesaw mechanism
at colliders such as the LHC and the ILC.


title: Predicting Abnormal Returns From News Using Text Classification

abstract:
  We show how text from news articles can be used to predict intraday price
movements of financial assets using support vector machines. Multiple kernel
learning is used to combine equity returns with text as predictive features to
increase classification performance and we develop an analytic center cutting
plane method to solve the kernel learning problem efficiently. We observe that
while the direction of returns is not predictable using either text or returns,
their size is, with text features producing significantly better performance
than historical returns alone.


title:
On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation. II.
  The Effect of Metallicity

abstract:
  It has been observed that Cepheids in the Magellanic Clouds have lower masses
for the same luminosity than those in the Milky Way. The model, from Neilson &
Lester (2008), of pulsation-driven mass loss for Cepheids is applied to
theoretical models of Cepheids with metallicity consistent with the Milky Way
and Large and Small Magellanic Clouds. The mass-loss model is analyzed using
the metallicity correction of the Period-Luminosity relation to compare the
ratio of mass loss of Cepheids with lower metallicity to that of Cepheids with
solar metallicity. It is determined that mass loss may be larger for the lower
metallicity Cepheids, counterintuitive to radiative driving estimates. Also the
mass-loss rates of theoretical Cepheid models are found to be up to $5\times
10^{-9}$ for Galactic Cepheids, $5\times 10^{-8}$ for Large Magellanic Cloud
Cepheids, and $2\times 10^{-7}M_\odot /yr$ for Small Magellanic Cloud Cepheids.
It is argued that mass loss increases as metallicity decreases for Cepheids
with periods less than 20 days and that mass loss decreases for longer periods.
Assuming dust forms in the wind of a Cepheid at some distance, the infrared
excess of the models is computed, finding the infrared brightness is
approximately a magnitude larger due to mass loss. The infrared magnitudes are
compared to recently published Period-Luminosity relations as a test of our
predictions.


title:
Constraining the Scatter in the Mass-Richness Relation of maxBCG
  Clusters With Weak Lensing and X-ray Data

abstract:
  We measure the logarithmic scatter in mass at fixed richness for clusters in
the maxBCG cluster catalog, an optically selected cluster sample drawn from
SDSS imaging data. Our measurement is achieved by demanding consistency between
available weak lensing and X-ray measurements of the maxBCG clusters, and the
X-ray luminosity--mass relation inferred from the 400d X-ray cluster survey, a
flux limited X-ray cluster survey. We find \sigma_{\ln
M|N_{200}}=0.45^{+0.20}_{-0.18} (95% CL) at N_{200} ~ 40, where N_{200} is the
number of red sequence galaxies in a cluster. As a byproduct of our analysis,
we also obtain a constraint on the correlation coefficient between \ln Lx and
\ln M at fixed richness, which is best expressed as a lower limit, r_{L,M|N} >=
0.85 (95% CL). This is the first observational constraint placed on a
correlation coefficient involving two different cluster mass tracers. We use
our results to produce a state of the art estimate of the halo mass function at
z=0.23 -- the median redshift of the maxBCG cluster sample -- and find that it
is consistent with the WMAP5 cosmology. Both the mass function data and its
covariance matrix are presented.


title:
Mapping dusty star formation in and around a cluster at z=0.81 by
  wide-field imaging with AKARI

abstract:
  We present environmental dependence of dusty star forming activity in and
around the cluster RXJ1716.4+6708 at z=0.81 based on wide-field and
multi-wavelength observations with Suprime-Cam on the Subaru telescope and IRC
onboard the AKARI satellite. Our optical data shows that the optical colour
distribution of galaxies starts to dramatically change from blue to red at the
medium-density environment such as cluster outskirts, groups and filaments. By
combining with infrared data, we find that 15 micron galaxies tend to have
optical colours between the red sequence and the blue cloud with a tail into
the red sequence.
  The spatial distribution of the 15 micron galaxies over ~200 arcmin^2 around
the cluster reveals that few 15 micron galaxies are detected in the cluster
central region. This is probably due to the low star forming activity in the
cluster core. However, interestingly, the fraction of 15 micron galaxies in the
medium-density environments is as high as in the low-density field, despite the
fact that the optical colours start to change in the medium-density
environments. Furthermore, we find that 15 micron galaxies which have optically
red colours (candidates for dusty red galaxies) and galaxies with high specific
star formation rates are also concentrated in the medium-density environment.
These results imply that the star forming activity in galaxies in groups and
filaments is enhanced due to some environmental effects specific to the
medium-density environment, and such a phenomenon is probably directly
connected to the truncation of star forming activity in galaxies seen as the
dramatic change in optical colours in such environments.


title: The abundance of lensing protoclusters

abstract:
  Weak gravitational lensing provides a potentially powerful method for the
detection of clusters. In addition to cluster candidates, a large number of
objects with possibly no optical or X-ray component have been detected in
shear-selected samples. We develop an analytic model to investigate the claim
of Weinberg & Kamionkowski (2002) that unvirialised protoclusters account for a
significant number of these so-called "dark" lenses. In our model, a
protocluster consists of a small virialised region surrounded by in-falling
matter. We find that, in order for a protocluster to simultaneously escape
X-ray detection and create a detectable weak lensing signal, it must have a
small virial mass (~10^{13} \Msun) and large total mass (~ 10^{15} \Msun), with
a relatively flat density profile outside of the virial radius. Such objects
would be characterized by rising tangential shear profiles well beyond the
virial radius. We use a semi-analytic approach based on the excursion set
formalism to estimate the abundance of lensing protoclusters with a low
probability of X-ray detection. We find that they are extremely rare,
accounting for less than 0.4 per cent of the total lenses in a survey with
background galaxy density n = 30 arcmin^{-2} and an intrinsic ellipticity
dispersion of 0.3. We conclude that lensing protoclusters with undetectable
X-Ray luminosities are too rare to account for a significant number of dark
lenses.


title: An Improved Cluster Richness Estimator

abstract:
  Minimizing the scatter between cluster mass and accessible observables is an
important goal for cluster cosmology. In this work, we introduce a new matched
filter richness estimator, and test its performance using the maxBCG cluster
catalog. Our new estimator significantly reduces the variance in the
L_X-richness relation, from \sigma_{\ln L_X}^2=(0.86\pm0.02)^2 to \sigma_{\ln
L_X}^2=(0.69\pm0.02)^2. Relative to the maxBCG richness estimate, it also
removes the strong redshift dependence of the richness scaling relations, and
is significantly more robust to photometric and redshift errors. These
improvements are largely due to our more sophisticated treatment of galaxy
color data. We also demonstrate the scatter in the L_X-richness relation
depends on the aperture used to estimate cluster richness, and introduce a
novel approach for optimizing said aperture which can be easily generalized to
other mass tracers.


title: Cosmological constraints on general, single field inflation

abstract:
  Inflation is now an accepted paradigm in standard cosmology, with its
predictions consistent with observations of the cosmic microwave background. It
lacks, however, a firm physical theory, with many possible theoretical origins
beyond the simplest, canonical, slow-roll inflation, including
Dirac-Born-Infeld inflation and k-inflation. We discuss how a hierarchy of
Hubble flow parameters, extended to include the evolution of the inflationary
sound speed, can be applied to compare a general, single field inflationary
action with cosmological observational data. We show that it is important to
calculate the precise scalar and tensor primordial power spectra by integrating
the full flow and perturbation equations, since values of observables can
deviate appreciably from those obtained using typical second-order Taylor
expanded approximations in flow parameters. As part of this, we find that a
commonly applied approximation for the tensor to scalar ratio, r \approx 16
c_s\epsilon, becomes poor (deviating by as much as 50%) as c_s deviates from 1
and hence the Taylor expansion including next-to-leading order contribution
terms involving c_s is required. By integrating the full flow equations, we use
a Monte-Carlo-Markov-Chain approach to impose constraints on the parameter
space of general single field inflation, and reconstruct the properties of such
an underlying theory in light of recent cosmic microwave background and
large-scale structure observations.


title: Building the full PMNS Matrix from six independent Majorana-type phases

abstract:
  In the framework of three light Majorana neutrinos, we show how to
reconstruct, through the use of 3 x 3 unitarity, the full PMNS matrix from six
independent Majorana-type phases. In particular, we express the strength of
Dirac-type CP violation in terms of these Majorana-type phases by writing the
area of the unitarity triangles in terms of these phases. We also study how
these six Majorana phases appear in CP-odd weak basis invariants as well as in
leptonic asymmetries relevant for flavoured leptogenesis.


title:
Revealing components of the galaxy population through nonparametric
  techniques

abstract:
  The distributions of galaxy properties vary with environment, and are often
multimodal, suggesting that the galaxy population may be a combination of
multiple components. The behaviour of these components versus environment holds
details about the processes of galaxy development. To release this information
we apply a novel, nonparametric statistical technique, identifying four
components present in the distribution of galaxy H$\alpha$ emission-line
equivalent-widths. We interpret these components as passive, star-forming, and
two varieties of active galactic nuclei. Independent of this interpretation,
the properties of each component are remarkably constant as a function of
environment. Only their relative proportions display substantial variation. The
galaxy population thus appears to comprise distinct components which are
individually independent of environment, with galaxies rapidly transitioning
between components as they move into denser environments.


title: A topological approach to induction theorems in Springer theory

abstract:
  We give a self-contained account of a construction due to Rossmann which
lifts Springer's action of a Weyl group on the cohomology of a Springer fiber
to an action on its homotopy type. We use this construction to produce a
generalization of an "induction theorem" of Alvis and Lusztig, which relates
the Springer representations attached to a reductive group to those attached to
a Levi subgroup. Our generalization applies to more general centralizers and to
representations of Weyl groups on mod p cohomology.