title: Spatial Relationship between Solar Flares and Coronal Mass Ejections

abstract:
  We report on the spatial relationship between solar flares and coronal mass
ejections (CMEs) observed during 1996-2005 inclusive. We identified 496
flare-CME pairs considering limb flares (distance from central meridian > 45
deg) with soft X-ray flare size > C3 level. The CMEs were detected by the Large
Angle and Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric
Observatory (SOHO). We investigated the flare positions with respect to the CME
span for the events with X-class, M-class, and C-class flares separately. It is
found that the most frequent flare site is at the center of the CME span for
all the three classes, but that frequency is different for the different
classes. Many X-class flares often lie at the center of the associated CME,
while C-class flares widely spread to the outside of the CME span. The former
is different from previous studies, which concluded that no preferred flare
site exists. We compared our result with the previous studies and conclude that
the long-term LASCO observation enabled us to obtain the detailed spatial
relation between flares and CMEs. Our finding calls for a closer flare-CME
relationship and supports eruption models typified by the CSHKP magnetic
reconnection model.


title:
A Vector Supersymmetry Killing IR Divergences in Non-Commutative Gauge
  Theories

abstract:
  This is a report on the joint work with Francois Gieres, Stefan Hohenegger,
Olivier Piguet and Manfred Schweda. We consider a non-commutative U(1) gauge
theory with an extension which was originally proposed by A. A. Slavnov in
order to get rid of UV/IR mixing problems. Here we show, that the improved IR
behaviour of this model is mainly due to the appearence of a linear vector
supersymmetry.


title: How we discovered the nonet of light scalar mesons

abstract:
  As has been confirmed meanwhile by lattice-QCD calculations (see e.g.
hep-lat/0702023), the confinement spectrum of non-exotic quark-antiquark
systems has its ground state for scalar mesons well above 1 GeV in the
Resonance Spectrum Expansion (RSE). For instance, in the S-wave Kaon-pion RSE
amplitude, a broad resonance was predicted slightly above 1.4 GeV
[hep-ex/0106077], which is confirmed by experiment as the K*0(1430). However, a
complete nonet of light scalar mesons was predicted (Zeit.Phys.C30,615
[http://www-spires.slac.stanford.edu/spires/find/hep?key=1573454]) as well,
when a model strongly related to the RSE and initially developed to describe
the heavy quarkonia resonance spectra (Phys.Rev.D21,772
[http://www-spires.slac.stanford.edu/spires/find/hep?key=363162]) was applied
in the light-quark sector. Thus, it was found that the light scalar-meson nonet
constitutes part of the ordinary meson spectrum, albeit represented by
"extraordinary" [hep-ph/0701038] poles [hep-ex/0106077].
  Similar resonances and bound states appear in the charmed sector
[hep-ph/0305035], and are predicted in the B-meson spectrum [hep-ph/0312078,
hep-ph/0406242].
  A recent work [hep-ph/0703286] confirmed the presence of light scalar-meson
poles in the RSE amplitude for S-wave and P-wave pion-pion and Kaon-pion
contributions to three-body decay processes measured by the BES, E791 and FOCUS
collaborations.


title: A linear moose model with pairs of degenerate gauge boson triplets

abstract:
  The possibility of the existence of a strongly interacting electroweak
symmetry breaking sector, as opposed to the weakly interacting light Higgs of
the Standard Model, is not yet ruled out by experiments. In this paper we make
an extensive study of a deconstructed model (or ``moose'' model) providing a
possible effective description of such a strong symmetry breaking sector, and
show its compatibility with experimental data for a wide portion of the model
parameters space. The model is a direct generalization of the previously
proposed D-BESS model.


title:
Taxonomy and clustering in collaborative systems: the case of the
  on-line encyclopedia Wikipedia

abstract:
  In this paper we investigate the nature and structure of the relation between
imposed classifications and real clustering in a particular case of a
scale-free network given by the on-line encyclopedia Wikipedia. We find a
statistical similarity in the distributions of community sizes both by using
the top-down approach of the categories division present in the archive and in
the bottom-up procedure of community detection given by an algorithm based on
the spectral properties of the graph. Regardless the statistically similar
behaviour the two methods provide a rather different division of the articles,
thereby signaling that the nature and presence of power laws is a general
feature for these systems and cannot be used as a benchmark to evaluate the
suitability of a clustering method.


title:
High Mass X-ray Binaries and Recent Star Formation History of the Small
  Magellanic Cloud

abstract:
  We study the relation between high-mass X-ray binary (HMXB) population and
recent star formation history (SFH) for the Small Magellanic Cloud (SMC). Using
archival optical SMC observations, we have approximated the color-magnitude
diagrams of the stellar population by model stellar populations and, in this
way, reconstructed the spatially resolved SFH of the galaxy over the past 100
Myr.We analyze the errors and stability of this method for determining the
recent SFH and show that uncertainties in the models of massive stars at late
evolutionary stages are the main factor that limits its accuracy. By combining
the SFH with the spatial distribution of HMXBs obtained from XMM-Newton
observations, we have derived the dependence of the HMXB number on the time
elapsed since the star formation event. The number of young systems with ages
10 Myr is shown to be smaller than the prediction based on the type-II
supernova rate. The HMXB number reaches its maximum ~20-50 Myr after the star
formation event. This may be attributable, at least partly, to a low luminosity
threshold in the population of X-ray sources studied, Lmin~1e+34 erg/s. Be/X
systems make a dominant contribution to this population, while the contribution
from HMXBs with black holes is relatively small.


title: A momentum Space Analysis of the Triple Pomeron Vertex in pQCD

abstract:
  We study properties of the momentum space Triple Pomeron Vertex in
perturbative QCD. Particular attention is given to the collinear limit where
transverse momenta on one side of the vertex are much larger than on the other
side. We also comment on the kernels in nonlinear evolution equations.


title: Modelling spin qubits in carbon peapods

abstract:
  We have calculated electron spin interactions in chains of Sc@C82 endohedral
fullerenes in isolation and inserted into a semiconducting or metallic
single-walled carbon nanotube to form a peapod. Using hybrid density functional
theory (DFT), we find that the spin resides mainly on the fullerene cage,
whether or not the fullerenes are in a nanotube. The spin interactions decay
exponentially with fullerene separation, and the system can be described by a
simple antiferromagnetic Heisenberg spin chain. A generalised Hubbard-Anderson
model gives an exchange parameter J and a Coulomb parameter U in good agreement
with the DFT values. Within the accuracy of the calculations, neither
semiconducting nor metallic nanotubes affect the interactions between the
fullerene electron spins.


title:
Effects of stellar collisions on star cluster evolution and core
  collapse

abstract:
  We systematically study the effects of collisions on the overall dynamical
evolution of dense star clusters using Monte Carlo simulations over many
relaxation times. We derive many observable properties of these clusters,
including their core radii and the radial distribution of collision products.
We also study different aspects of collisions in a cluster taking into account
the shorter lifetimes of more massive stars, which has not been studied in
detail before. Depending on the lifetimes of the significantly more massive
collision products, observable properties of the cluster can be modified
qualitatively; for example, even without binaries, core collapse can sometimes
be avoided simply because of stellar collisions.


title: The Baikal Neutrino Telescope: Status and plans

abstract:
  The high energy neutrino telescope NT200+ is currently in operation in Lake
Baikal. We review the status of the Baikal the Baikal Neutrino Telescope, and
describe recent progress on key components of the next generation
kilometer-cube (km3) Lake Baikal detector, like investigation of new large area
phototubes, integrated into the telescope.


title: The Baikal Neutrino Telescope: Selected Physics Results

abstract:
  We present results on searches for exotic particles (relativistic magnetic
monopoles and WIMPs) and for UHE neutrinos, obtained with the Baikal neutrino
telescope NT200.


title: Localization on quantum graphs with random vertex couplings

abstract:
  We consider Schr\"odinger operators on a class of periodic quantum graphs
with randomly distributed Kirchhoff coupling constants at all vertices. Using
the technique of self-adjoint extensions we obtain conditions for localization
on quantum graphs in terms of finite volume criteria for some energy-dependent
discrete Hamiltonians. These conditions hold in the strong disorder limit and
at the spectral edges.


title: A Unified Approach to Algebraic Set Theory

abstract:
  The paper provides an introduction to the field of Algebraic Set Theory
(AST). AST is a flexible categorical framework for studying different kinds of
set theories: both classical and constructive, predicative and impredicative.
We discuss the basic results in this area, with a particular emphasis on
applications to the constructive set theories IZF and CZF. (This paper is a
summary of a tutorial on categorical logic given by the second named author at
the Logic Colloquium 2006 in Nijmegen.)


title: Parity Doublet Model applied to Neutron Stars

abstract:
  The Parity doublet model containing the SU(2) multiplets including the
baryons identified as the chiral partners of the nucleons is applied for
neutron star matter. The chiral restoration is analyzed and the maximum mass of
the star is calculated.


title: Identifying $D_{sJ}(2700)$ through its decay modes

abstract:
  We study how to assign the recently observed $D_{sJ}(2700)$ meson to an
appropriate level of the $c \bar s$ spectrum by the analysis of its decay modes
in final states comprising a light pseudoscalar meson. We use an effective
lagrangian approach with heavy quark and chiral symmetries, obtaining that the
measurement of the $D^* K$ decay width would allow to distinguish between two
possible assignments.


title:
$C^*$-envelopes of universal free products and semicrossed products for
  multivariable dynamics

abstract:
  We show that for a class of operator algebras satisfying a natural condition
the $C^*$-envelope of the universal free product of operator algebras $A_i$ is
given by the free product of the $C^*$-envelopes of the $A_i$. We apply this
theorem to, in special cases, the $C^*$-envelope of the semicrossed products
for multivariable dynamics in terms of the single variable semicrossed products
of Peters.


title:
A curious example of two model categories and some associated
  differential graded algebras

abstract:
  The paper gives a new proof that the model categories of stable modules for
the rings Z/(p^2) and (Z/p)[\epsilon]/(\epsilon^2) are not Quillen equivalent.
The proof uses homotopy endomorphism ring spectra. Our considerations lead to
an example of two differential graded algebras which are derived equivalent but
whose associated model categories of modules are not Quillen equivalent. As a
bonus, we also obtain derived equivalent dgas with non-isomorphic K-theories.


title: Separable states and positive maps

abstract:
  Using the natural duality between linear functionals on tensor products of
C*-algebras with the trace class operators on a Hilbert space H and linear maps
of the C*-algebra into B(H), we study the relationship between separability,
entanglement and the Peres condition of states and positivity properties of the
linear maps.


title:
Cohomology of the Hilbert scheme of points on a surface with values in
  representations of tautological bundles

abstract:
  Let $X$ a smooth quasi-projective algebraic surface, $L$ a line bundle on
$X$. Let $X^{[n]}$ the Hilbert scheme of $n$ points on $X$ and $L^{[n]}$ the
tautological bundle on $X^{[n]}$ naturally associated to the line bundle $L$ on
$X$. We explicitely compute the image $\bkrh(L^{[n]})$ of the tautological
bundle $L^{[n]}$ for the Bridgeland-King-Reid equivalence $\bkrh :
\B{D}^b(X^{[n]}) \ra \B{D}^b_{\perm_n}(X^n)$ in terms of a complex
$\comp{\mc{C}}_L$ of $\perm_n$-equivariant sheaves in $\B{D}^b_{\perm_n}(X^n)$.
We give, moreover, a characterization of the image $\bkrh(L^{[n]} \tens ...
\tens L^{[n]})$ in terms of of the hyperderived spectral sequence $E^{p,q}_1$
associated to the derived $k$-fold tensor power of the complex
$\comp{\mc{C}}_L$. The study of the $\perm_n$-invariants of this spectral
sequence allows to get the derived direct images of the double tensor power and
of the general $k$-fold exterior power of the tautological bundle for the
Hilbert-Chow morphism, providing Danila-Brion-type formulas in these two cases.
This yields easily the computation of the cohomology of $X^{[n]}$ with values
in $L^{[n]} \tens L^{[n]}$ and $\Lambda^k L^{[n]}$.


title: Medium-evolved fragmentation functions

abstract:
  Medium-induced gluon radiation is usually identified as the dominant
dynamical mechanism underling the {\it jet quenching} phenomenon observed in
heavy-ion collisions. In its actual implementation, multiple medium-induced
gluon emissions are assumed to be independent, leading, in the eikonal
approximation, to a Poisson distribution. Here, we introduce a medium term in
the splitting probabilities so that both medium and vacuum contributions are
included on the same footing in a DGLAP approach. The improvements include
energy-momentum conservation at each individual splitting, medium-modified
virtuality evolution and a coherent implementation of vacuum and medium
splitting probabilities. Noticeably, the usual formalism is recovered when the
virtuality and the energy of the parton are very large. This leads to a similar
description of the suppression observed in heavy-ion collisions with values of
the transport coefficient of the same order as those obtained using the {\it
quenching weights}.


title: Reducing the spectral index in F-term hybrid inflation

abstract:
  We consider a class of well motivated supersymmetric models of F-term hybrid
inflation (FHI) which can be linked to the supersymmetric grand unification.
The predicted scalar spectral index n_s cannot be smaller than 0.97 and can
exceed unity including corrections from minimal supergravity, if the number of
e-foldings corresponding to the pivot scale k_*=0.002/Mpc is around 50. These
results are marginally consistent with the fitting of the three-year Wilkinson
microwave anisotropy probe data by the standard power-law cosmological model
with cold dark matter and a cosmological constant. However, n_s can be reduced
by applying two mechanisms: (i) The utilization of a quasi-canonical Kahler
potential with a convenient choice of a sign and (ii) the restriction of the
number of e-foldings that k_* suffered during FHI. In the case (i), we
investigate the possible reduction of n_s without generating maxima and minima
of the potential on the inflationary path. In the case (ii), the additional
e-foldings required for solving the horizon and flatness problems can be
generated by a subsequent stage of fast-roll [slow-roll] modular inflation
realized by a string modulus which does [does not] acquire effective mass
before the onset of modular inflation.


title: Small-Scale Structure of Spacetime: Bounds and Conjectures

abstract:
  This review consists of two parts. The first part establishes certain
astrophysical bounds on the smoothness of classical spacetime. Some of the best
bounds to date are based on the absence of vacuum Cherenkov radiation in
ultrahigh-energy cosmic rays. The second part discusses possible implications
of these bounds for the quantum structure of spacetime. One conjecture is that
the fundamental length scale of quantum spacetime may be different from the
Planck length.


title: The Chemical Enrichment History of the Large Magellanic Cloud

abstract:
  Ca II triplet spectroscopy has been used to derive stellar metallicities for
individual stars in four LMC fields situated at galactocentric distances of
3\arcdeg, 5\arcdeg, 6\arcdeg\@ and 8\arcdeg\@ to the north of the Bar. Observed
metallicity distributions show a well defined peak, with a tail toward low
metallicities. The mean metallicity remains constant until 6\arcdeg\@
([Fe/H]$\sim$-0.5 dex), while for the outermost field, at 8\arcdeg, the mean
metallicity is substantially lower than in the rest of the disk
([Fe/H]$\sim$-0.8 dex). The combination of spectroscopy with deep CCD
photometry has allowed us to break the RGB age--metallicity degeneracy and
compute the ages for the objects observed spectroscopically. The obtained
age--metallicity relationships for our four fields are statistically
indistinguishable. We conclude that the lower mean metallicity in the outermost
field is a consequence of it having a lower fraction of intermediate-age stars,
which are more metal-rich than the older stars. The disk age--metallicity
relationship is similar to that for clusters. However, the lack of objects with
ages between 3 and 10 Gyr is not observed in the field population. Finally, we
used data from the literature to derive consistently the age--metallicity
relationship of the bar. Simple chemical evolution models have been used to
reproduce the observed age--metallicity relationships with the purpose of
investigating which mechanism has participated in the evolution of the disk and
bar. We find that while the disk age--metallicity relationship is well
reproduced by close-box models or models with a small degree of outflow, that
of the bar is only reproduced by models with combination of infall and outflow.


title: Aspects of Predicative Algebraic Set Theory I: Exact Completion

abstract:
  This is the first in a series of three papers on Algebraic Set Theory. Its
main purpose is to lay the necessary groundwork for the next two parts, one on
Realisability and the other on Sheaf Models in Algebraic Set Theory.


title: Multivariable Wilson polynomials and degenerate Hecke algebras

abstract:
  We study a rational version of the double affine Hecke algebra associated to
the nonreduced affine root system of type $(C^\vee_n,C_n)$. A certain
representation in terms of difference-reflection operators naturally leads to
the definition of nonsymmetric versions of the multivariable Wilson
polynomials. Using the degenerate Hecke algebra we derive several properties,
such as orthogonality relations and quadratic norms, for the nonsymmetric and
symmetric multivariable Wilson polynomials.


title:
Fedosov Quantization of Lagrange-Finsler and Hamilton-Cartan Spaces and
  Einstein Gravity Lifts on (Co) Tangent Bundles

abstract:
  We provide a method of converting Lagrange and Finsler spaces and their
Legendre transforms to Hamilton and Cartan spaces into almost Kaehler
structures on tangent and cotangent bundles. In particular cases, the Hamilton
spaces contain nonholonomic lifts of (pseudo) Riemannian / Einstein metrics on
effective phase spaces. This allows us to define the corresponding Fedosov
operators and develop deformation quantization schemes for nonlinear mechanical
and gravity models on Lagrange- and Hamilton-Fedosov manifolds.


title: String instantons, fluxes and moduli stabilization

abstract:
  We analyze a class of dual pairs of heterotic and type I models based on
freely-acting $\mathbb{Z}_2 \times \mathbb{Z}_2$ orbifolds in four dimensions.
Using the adiabatic argument, it is possible to calculate non-perturbative
contributions to the gauge coupling threshold corrections on the type I side by
exploiting perturbative calculations on the heterotic side, without the
drawbacks due to twisted moduli. The instanton effects can then be combined
with closed-string fluxes to stabilize most of the moduli fields of the
internal manifold, and also the dilaton, in a racetrack realization of the type
I model.


title:
Analyzing the effects of surface distribution of pores in cell
  electroporation for a cell membrane containing cholesterol

abstract:
  This paper presents a model and numerical analysis (simulations) of
transmembrane potential induced in biological cell membrane under the influence
of externally applied electric field (i.e., electroporation). This model
differs from the established models of electroporation in two distinct ways.
Firstly, it incorporates the presence of cholesterol (~20% mole-fraction) in
biological membrane. Secondly, it considers the distribution of pores as a
function of the variation of transmembrane potential from one region of the
cell to another. Formulation is based on the role of membrane tension and
electrical forces in the formation of pores in a cell membrane, which is
considered as an infinitesimally thin insulator. The model has been used to
explore the process of creation and evolution of pores and to determine the
number and size of pores as a function of applied electric field (magnitude and
duration). Results show that the presence of cholesterol enhances poration by
changing the membrane tension. Analyses indicate that the number of pores and
average pore radii differ significantly from one part of the cell to the other.
While some regions of the cell membrane undergo rapid and dense poration,
others remain unaffected. The method can be a useful tool for a more realistic
prediction of pore formation in cells subjected to electroporation.


title: Knot Concordance and Higher-Order Blanchfield Duality

abstract:
  In 1997, T. Cochran, K. Orr, and P. Teichner defined a filtration {F_n} of
the classical knot concordance group C. The filtration is important because of
its strong connection to the classification of topological 4-manifolds. Here we
introduce new techniques for studying C and use them to prove that, for each
natural number n, the abelian group F_n/F_{n.5} has infinite rank. We establish
the same result for the corresponding filtration of the smooth concordance
group. We also resolve a long-standing question as to whether certain natural
families of knots, first considered by Casson-Gordon and Gilmer, contain slice
knots.


title:
Electroweak radiative corrections to the three channels of the process
  f_1 bar-f_1 ZA --> 0

abstract:
  We have calculated the electroweak radiative corrections at the O(alpha)
level to the three channels of the process f_1 bar-f_1 Z A --> 0 and
implemented them into the SANC system. Here A stands for the photon and f_1 for
a first generation fermion whose mass is neglected everywhere except in
arguments of logarithmic functions. The symbol --> 0 means that 4-momenta of
all the external particles flow inwards. We present the complete analytical
results for the covariant and helicity amplitudes for three cross channels: f_1
+ bar-f_1 --> Z + gamma, Z --> f_1 + bar-f_1 + gamma and f_1 + gamma --> f_1 +
Z. The one-loop scalar form factors of these channels are simply related by an
appropriate permutation of their arguments s,t,u. To check the correctness of
our results we first of all observe the independence of the scalar form factors
on the gauge parameters and the validity of the Ward identity, i.e. external
photon transversality, and, secondly, compare our numerical results with the
other independent calculations available to us.


title: Casimir Forces between Compact Objects: I. The Scalar Case

abstract:
  We have developed an exact, general method to compute Casimir interactions
between a finite number of compact objects of arbitrary shape and separation.
Here, we present details of the method for a scalar field to illustrate our
approach in its most simple form; the generalization to electromagnetic fields
is outlined in Ref. [1]. The interaction between the objects is attributed to
quantum fluctuations of source distributions on their surfaces, which we
decompose in terms of multipoles. A functional integral over the effective
action of multipoles gives the resulting interaction. Each object's shape and
boundary conditions enter the effective action only through its scattering
matrix. Their relative positions enter through universal translation matrices
that depend only on field type and spatial dimension. The distinction of our
method from the pairwise summation of two-body potentials is elucidated in
terms of the scattering processes between three objects. To illustrate the
power of the technique, we consider Robin boundary conditions $\phi -\lambda
\partial_n \phi=0$, which interpolate between Dirichlet and Neumann cases as
$\lambda$ is varied. We obtain the interaction between two such spheres
analytically in a large separation expansion, and numerically for all
separations. The cases of unequal radii and unequal $\lambda$ are studied. We
find sign changes in the force as a function of separation in certain ranges of
$\lambda$ and see deviations from the proximity force approximation even at
short separations, most notably for Neumann boundary conditions.


title: Mapping the Atmospheres of Hot Jupiters

abstract:
  We present the results of recent observations of phase-dependent variations
in brightness designed to characterize the atmospheres of hot Jupiters. In
particular, we focus on recent observations of the transiting planet HD 189733b
at 8 micron using the Spitzer Space Telescope, which allow us to determine the
efficiency of the day-night circulation on this planet and estimate the
longitudinal positions of hot and cold regions in the atmosphere. We discuss
the implications of these observations in the context of two other successful
detections of more sparsely-sampled phase variations for the non-transiting
systems upsilon And b and HD 179949b, which imply a potential diversity in the
properties of the atmospheres of hot Jupiters. Lastly, we highlight several
upcoming Spitzer observations that will extend this sample to additional
wavelengths and more transiting systems in the near future.


title: Towards Einstein-Podolsky-Rosen quantum channel multiplexing

abstract:
  A single broadband squeezed field constitutes a quantum communication
resource that is sufficient for the realization of a large number N of quantum
channels based on distributed Einstein-Podolsky-Rosen (EPR) entangled states.
Each channel can serve as a resource for, e.g. independent quantum key
distribution or teleportation protocols. N-fold channel multiplexing can be
realized by accessing 2N squeezed modes at different Fourier frequencies. We
report on the experimental implementation of the N=1 case through the
interference of two squeezed states, extracted from a single broadband squeezed
field, and demonstrate all techniques required for multiplexing (N>1). Quantum
channel frequency multiplexing can be used to optimize the exploitation of a
broadband squeezed field in a quantum information task. For instance, it is
useful if the bandwidth of the squeezed field is larger than the bandwidth of
the homodyne detectors. This is currently a typical situation in many
experiments with squeezed and two-mode squeezed entangled light.


title: Quantum plasticity and dislocation-induced supersolidity

abstract:
  We suggest that below a certain temperature T_k, the free energy for the
creation of kinks-antikinks pairs in the dislocation network of solid He4
becomes negative. The underlying physical mechanism is the related liberation
of vacancies which initiate Feynman's permutation cycles in the bulk.
Consequently, dislocations should wander and sweep an increasingly larger
volume at low temperatures. This phenomenon should lead both to a stiffening of
the solid below T_k and to the appearance of a non zero superfluid fraction at
a second temperature T_c < T_k.


title:
Influences of an impurity on the transport properties of one-dimensional
  antisymmetric spin filter

abstract:
  The influences of an impurity on the spin and the charge transport of
one-dimensional antisymmetric spin filter are investigated using bosonization
and Keldysh formulation and the results are highlighted against those of
spinful Luttinger liquids. Due to the dependence of the electron spin
orientation on wave number the spin transport is not affected by the impurity,
while the charge transport is essentially identical with that of spinless
one-dimensional Luttinger liquid.


title: Addendum to: Commensurations of the Johnson kernel

abstract:
  Let K(S) be the subgroup of the extended mapping class group, Mod(S),
generated by Dehn twists about separating curves. In our earlier paper, we
showed that Comm(K(S)) and Aut(K(S)) are both isomorphic to Mod(S) when S is a
closed, connected, orientable surface of genus g at least 4. By modifying our
original proof, we show that the same result holds for g at leat 3, thus
confirming Farb's conjecture in all cases (the statement is not true for any g
less than 3).


title:
Helicity Amplitudes for Charmonium Production in Hadron-Hadron and
  Photon-Hadron Collisions

abstract:
  We present the gluon-gluon and photon-gluon helicity amplitudes for color
singlet and octet charmonium production in polarized and unpolarized
hadron-hadron and photon-hadron collisions.


title:
First observation of J/\psi and \psi(2S) decaying to n K^0_S\bar\Lambda
  +c.c

abstract:
  The decays of $\jpsi$ and $\psip$ to ${n}{K^0_S}\bar{\Lambda}+c.c.$ are
observed and measured for the first time, and the perturbative QCD ``12%'' rule
is tested, based on $5.8 \times 10^7$ $\jpsi$ and $1.4 \times 10^7$ $\psip$
events collected with BESII detector at the Beijing Electron-Positron Collider.
No obvious enhancement near $n\bar{\Lambda}$ threshold in $\jpsi \to
{n}{K^0_S}\bar{\Lambda}+c.c.$ is observed, and the upper limit on the branching
ratio of $\jpsi \to {K^0_S} X, X \to n \bar \Lambda$ is determined.


title: Cavity-QED with cold atoms trapped in a double-well potential

abstract:
  We investigate the interplay dynamics of a cavity qed system, where the
two-level atoms are trapped in a double-well potential, and the cavity mode,
with a frequency largely detuned to the atomic level splitting, is driven by a
probe laser. The interaction between the center-of-mass motion of the atoms and
the cavity mode is induced by the position dependent atom-field coupling. The
dynamics of the system is characterized by two distinct time scales, the
inverse of the atomic interwell tunneling rate and the inverse of the cavity
loss rate. The system shows drastically different (quasi) steady behaviors in
the short-time and long-time intervals.


title:
Acceleration-Enlarged Symmetries in Nonrelativistic Space-Time with a
  Cosmological Constant

abstract:
  By considering the nonrelativistic limit of de-Sitter geometry one obtains
the nonrelativistic space-time with a cosmological constant and Newton-Hooke
(NH) symmetries. We show that the NH symmetry algebra can be enlarged by the
addition of the constant acceleration generators and endowed with central
extensions (one in any dimension (D) and three in D=(2+1)). We present a
classical Lagrangian and Hamiltonian framework for constructing models
quasi-invariant under enlarged NH symmetries which depend on three parameters
described by three nonvanishing central charges. The Hamiltonian dynamics then
splits into external and internal sectors with new non-commutative structures
of external and internal phase spaces. We show that in the limit of vanishing
cosmological constant the system reduces to the one presented in [1] which
possesses accelaration-enlarged Galilean symmetries.


title:
Effect of the lattice alignment on Bloch oscillations of a Bose-Einstein
  condensate in a square optical lattice

abstract:
  We consider a Bose-Einstein condensate of ultracold atoms loaded into a
square optical lattice and subject to a static force. For vanishing atom-atom
interactions the atoms perform periodic Bloch oscillations for arbitrary
direction of the force. We study the stability of these oscillations for
non-vanishing interactions, which is shown to depend on an alignment of the
force vector with respect to the lattice crystallographic axes. If the force is
aligned along any of the axes, the mean field approach can be used to identify
the stability conditions. On the contrary, for a misaligned force one has to
employ the microscopic approach, which predicts periodic modulation of Bloch
oscillations in the limit of a large forcing.


title: Ballistic Phase of Self-Interacting Random Walks

abstract:
  We explain a unified approach to a study of ballistic phase for a large
family of self-interacting random walks with a drift and self-interacting
polymers with an external stretching force. The approach is based on a recent
version of the Ornstein-Zernike theory developed in earlier works. It leads to
local limit results for various observables (e.g. displacement of the end-point
or number of hits of a fixed finite pattern) on paths of n-step walks
(polymers) on all possible deviation scales from CLT to LD. The class of
models, which display ballistic phase in the "universality class" discussed in
the paper, includes self-avoiding walks, Domb-Joyce model, random walks in an
annealed random potential, reinforced polymers and weakly reinforced random
walks.


title: Virtual Gravitons at the LHC

abstract:
  Virtual gravitons effects at the LHC in scenarios with large extra dimensions
and low-scale gravity are sensitive to the ultraviolet completion of the
Kaluza-Klein effective theory. We study implications of a gravitational fixed
point at high energies on gravitational Drell-Yan lepton production in hadron
collisions. The fixed point behaviour leads to finite LHC cross sections. We
determine the reach for the fundamental Planck scale. An observation of these
signals might shed light on the fundamental quantum theory of gravity.


title: Interaction and thermodynamics of spinons in the XX chain

abstract:
  The mapping between the fermion and spinon compositions of eigenstates in the
one-dimensional spin-1/2 XX model on a lattice with N sites is used to describe
the spinon interaction from two different perspectives: (i) For finite N the
energy of all eigenstates is expressed as a function of spinon momenta and
spinon spins, which, in turn, are solutions of a set of Bethe ansatz equations.
The latter are the basis of an exact thermodynamic analysis in the spinon
representation of the XX model. (ii) For N -> infinity the energy per site of
spinon configurations involving any number of spinon orbitals is expressed as a
function of reduced variables representing momentum, filling, and magnetization
of each orbital. The spins of spinons in a single orbital are found to be
coupled in a manner well described by an Ising-like equivalent-neighbor
interaction, switching from ferromagnetic to antiferromagnetic as the filling
exceeds a critical level. Comparisons are made with results for the
Haldane-Shastry model.


title: Poisson Manifolds, Lie Algebroids, Modular Classes: a Survey

abstract:
  After a brief summary of the main properties of Poisson manifolds and Lie
algebroids in general, we survey recent work on the modular classes of Poisson
and twisted Poisson manifolds, of Lie algebroids with a Poisson or twisted
Poisson structure, and of Poisson-Nijenhuis manifolds. A review of the spinor
approach to the modular class concludes the paper.


title: Short Gamma Ray Bursts: a bimodal origin?

abstract:
  Short-hard Gamma Ray Bursts (SGRBs) are currently thought to arise from
gravitational wave driven coalescences of double neutron star systems forming
either in the field or dynamically in globular clusters. For both channels we
fit the peak flux distribution of BATSE SGRBs to derive the local burst
formation rate and luminosity function. We then compare the resulting redshift
distribution with Swift 2-year data, showing that both formation channels are
needed in order to reproduce the observations. Double neutron stars forming in
globular clusters are found to dominate the distribution at z<0.3, whereas the
field population from primordial binaries can account for the high-z SGRBs.
This result is not in contradiction with the observed host galaxy type of
SGRBs.


title:
Testing extra dimensions below the production threshold of Kaluza-Klein
  excitations

abstract:
  We consider a stabilized RS1 model in the energy range below the direct
production of KK states. In this range we work out the effective Lagrangian due
to exchange of heavy KK tensor graviton and scalar radion states and compute
explicitly the corresponding effective coupling constants. As an example, the
Drell-Yan lepton pair production at the Tevatron and the LHC is analyzed in two
situations, when the first KK resonance is too heavy to be directly detected at
the colliders, and when the first KK resonance is visible but other states are
still too heavy. It is shown that in both cases the contribution from the KK
invisible tower leads to a modification of final particles distributions. In
particular, for the second case a nontrivial interference between the first KK
mode and the rest KK tower takes place. Expected 95% CL limits for model
parameters for the Tevatron and the LHC are given. In the Appendix useful
formulas for the cross sections and distributions of various new $2\to2$
processes via heavy KK tower exchange are presented, the new formulas
containing nonzero particle masses for final state fermions and bosons. The
formulas and numerical results are obtained by means of the CompHEP code, in
which all new effective interactions are implemented providing a tool for
simulation of corresponding events and a more detailed analysis.


title: Moving NRQCD and B to K* gamma

abstract:
  The formulation of NRQCD discretized in a reference frame boosted relative to
the B rest frame will enable calculation of B form factors over a larger range
of momentum transfer. We have initiated a program to calculate form factors
describing the rare decay B to K* gamma. We discuss the strategy and challenges
of the project. As a first step in the numerical calculations, we present first
results for bottomonium quantities using the O(Lambda_{QCD}^2/m^2, v_{NR}^4)
moving NRQCD action.


title: The High Density Region of QCD from an Effective Model

abstract:
  We study the high density region of QCD within an effective model obtained in
the frame of the hopping parameter expansion and choosing Polyakov-type loops
as the main dynamical variables representing the fermionic matter. This model
still shows the so-called sign problem, a difficulty peculiar to non-zero
chemical potential, but it permits the development of algorithms which ensure a
good overlap of the simulated Monte Carlo ensemble with the true one. We review
the main features of the model and present results concerning the dependence of
various observables on the chemical potential and on the temperature, in
particular of the charge density and the Polykov loop susceptibility, which may
be used to characterize the various phases expected at high baryonic density.
In this way, we obtain information about the phase structure of the model and
the corresponding phase transitions and cross over regions, which can be
considered as hints about the behaviour of non-zero density QCD.


title: The twist-3 parton distribution function e(x) in large-Nc chiral theory

abstract:
  The chirally-odd twist-3 parton distribution function e(x) of the nucleon is
studied in the large-Nc limit in the framework of the chiral quark-soliton
model. It is demonstrated that in spite of properties not shared by other
distribution functions, namely the appearance of a delta(x)-singularity and
quadratic divergences in e(x), an equally reliable calculation is possible.
Among the most remarkable results obtained in this work is the fact that the
coefficient of the delta(x)-singularity can be computed exactly in this model,
avoiding involved numerics. Our results complete existing studies in
literature.


title: The Galactic Bulge: A Review

abstract:
  The Milky Way is the only galaxy for which we can resolve individual stars at
all evolutionary phases, from the Galactic center to the outskirt. The last
decade, thanks to the advent of near IR detectors and 8 meter class telescopes,
has seen a great progress in the understanding of the Milky Way central region:
the bulge. Here we review the most recent results regarding the bulge
structure, age, kinematics and chemical composition. These results have
profound implications for the formation and evolution of the Milky Way and of
galaxies in general. This paper provides a summary on our current understanding
of the Milky Way bulge, intended mainly for workers on other fields.


title: WFPC2 LRF Imaging of Emission Line Nebulae in 3CR Radio Galaxies

abstract:
  We present HST/WFPC2 Linear Ramp Filter images of high surface brightness
emission lines (either [OII], [OIII], or H-alpha+[NII]) in 80 3CR radio
sources. We overlay the emission line images on high resolution VLA radio
images (eight of which are new reductions of archival data) in order to examine
the spatial relationship between the optical and radio emission. We confirm
that the radio and optical emission line structures are consistent with weak
alignment at low redshift (z < 0.6) except in the Compact Steep Spectrum (CSS)
radio galaxies where both the radio source and the emission line nebulae are on
galactic scales and strong alignment is seen at all redshifts. There are weak
trends for the aligned emission line nebulae to be more luminous, and for the
emission line nebula size to increase with redshift and/or radio power. The
combination of these results suggests that there is a limited but real capacity
for the radio source to influence the properties of the emission line nebulae
at these low redshifts (z < 0.6). Our results are consistent with previous
suggestions that both mechanical and radiant energy are responsible for
generating alignment between the radio source and emission line gas.


title: ADIPLS -- the Aarhus adiabatic oscillation package

abstract:
  Development of the Aarhus adiabatic pulsation code started around 1978.
Although the main features have been stable for more than a decade, development
of the code is continuing, concerning numerical properties and output. The code
has been provided as a generally available package and has seen substantial use
at a number of installations. Further development of the package, including
bringing the documentation closer to being up to date, is planned as part of
the HELAS Coordination Action.


title:
D=4, N=2 Supergravity in the Presence of Vector-Tensor Multiplets and
  the Role of higher p-forms in the Framework of Free Differential Algebras

abstract:
  We thoroughly analyze at the bosonic level, in the framework of Free
Differential Algebras (FDA), the role of 2-form potentials setting in
particular evidence the precise geometric formulation of the anti-Higgs
mechanism giving mass to the tensors. We then construct the (super)-FDA
encoding the coupling of vector-tensor multiplets in D=4, N=2 supergravity, by
solving the Bianchi identities in superspace and thus retrieving the full
theory up to 3-fermions terms in the supersymmetry transformation laws, leaving
the explicit construction of the Lagrangian to future work. We further explore
the extension of the bosonic FDA in the presence of higher p-form potentials,
focussing our attention to the particular case p=3, which would occur in the
construction of D=5, N=2 supergravity where some of the scalars are properly
dualized.


title: Functional programming framework for GRworkbench

abstract:
  The software tool GRworkbench is an ongoing project in visual, numerical
General Relativity at The Australian National University. Recently, the
numerical differential geometric engine of GRworkbench has been rewritten using
functional programming techniques. By allowing functions to be directly
represented as program variables in C++ code, the functional framework enables
the mathematical formalism of Differential Geometry to be more closely
reflected in GRworkbench . The powerful technique of `automatic
differentiation' has replaced numerical differentiation of the metric
components, resulting in more accurate derivatives and an order-of-magnitude
performance increase for operations relying on differentiation.


title: Heavy MSSM Higgs Bosons at CMS: "LHC wedge" and Higgs-Mass Precision

abstract:
  The search for MSSM Higgs bosons will be an important goal at the LHC. In
order to analyze the search reach of the CMS experiment for the heavy neutral
MSSM Higgs bosons, we combine the latest results for the CMS experimental
sensitivities based on full simulation studies with state-of-the-art
theoretical predictions of MSSM Higgs-boson properties. The experimental
analyses are done assuming an integrated luminosity of 30 or 60 fb^-1. The
results are interpreted as 5$ \si$ discovery contours in MSSM M_A-tan_beta
benchmark scenarios. Special emphasis is put on the variation of the Higgs
mixing parameter mu. While the variation of mu can shift the prospective
discovery reach (and correspondingly the ``LHC wedge'' region) by about Delta
tan_beta= 10, the discovery reach is rather stable with respect to the impact
of other supersymmetric parameters. Within the discovery region we analyze the
accuracy with which the masses of the heavy neutral Higgs bosons can be
determined. An accuracy of 1-4% should be achievable, depending on M_A and
tan_beta.


title:
Anomalous Thermal Conductivity of Semi-Metallic Superconductors with
  Electron-Hole Compensation

abstract:
  The effects of low carrier density and carrier compensation on mixed-state
thermal transport are investigated beyond the quasiclassical approximation. It
is shown that, contrary to the usual observations, the interplay of the two
effects leads to an {\it increase} in the thermal conductivity immediately
below the upper critical field $H_{c2}$. Our result can account for the
anomalous behavior of the mixed-state thermal conductivity near $H_{c2}$
recently observed in URu$_2$Si$_2$.


title: Long-time self-diffusion of Brownian Gaussian-core particles

abstract:
  Using extensive Brownian dynamics computer simulations, the long-time
self-diffusion coefficient is calculated for Gaussian-core particles as a
function of the number density. Both spherical and rod-like particles
interacting via Gaussian segments ar$ For increasing concentration we find that
the translational self-diffusion behaves non-monotonically reflecting the
structural reentrance effect in the equilibrium phase diagram. Both in the
limits of zero and infinite concentration, it approaches its short-time value.
The microscopic Medina-Noyola theory qualitatively accounts for the
translational long-time diffusion. The long-time orientational diffusion
coefficient for Gaussian rods, on the other hand, remains very close to its
short-time counterpart for any density. Some implications of the weak
translation-rotation coupling for ultrasoft rods are discussed.


title: Possible CP-Violation effects in core-collapse Supernovae

abstract:
  We study CP-violation effects when neutrinos are present in dense matter,
such as outside the proto-neutron star formed in a core-collapse supernova.
Using general arguments based on the Standard Model, we confirm that there are
no CP-violating effects at the tree level on the electron neutrino and
anti-neutrino fluxes in a core-collapse supernova. On the other hand
significant effects can be obtained for muon and tau neutrinos even at the tree
level. We show that CP violating effects can be present in the supernova
electron (anti)neutrino fluxes as well, if muon and tau neutrinos have
different fluxes at the neutrinosphere. Such differences could arise due to
physics beyond the Standard Model, such as the presence of flavor-changing
interactions.


title: A prototype device for acoustic neutrino detection in Lake Baikal

abstract:
  In April 2006, a 4-channel acoustic antenna has been put in long-term
operation on Lake Baikal. The detector was installed at a depth of about 100 m
on the instrumentation string of Baikal Neutrino Telescope NT200+. This
detector may be regarded as a prototype of a subunit for a future underwater
acoustic neutrino telescope. We describe the design of acoustic detector and
present first results obtained from data analysis.


title: ASTEC -- the Aarhus STellar Evolution Code

abstract:
  The Aarhus code is the result of a long development, starting in 1974, and
still ongoing. A novel feature is the integration of the computation of
adiabatic oscillations for specified models as part of the code. It offers
substantial flexibility in terms of microphysics and has been carefully tested
for the computation of solar models. However, considerable development is still
required in the treatment of nuclear reactions, diffusion and convective
mixing.


title:
Frobenius Manifolds and Central Invariants for the Drinfeld - Sokolov
  Bihamiltonian Structures

abstract:
  The Drinfeld - Sokolov construction associates a hierarchy of bihamiltonian
integrable systems with every untwisted affine Lie algebra. We compute the
complete set of invariants of the related bihamiltonian structures with respect
to the group of Miura type transformations.


title: Zonotopes With Large 2D Cuts

abstract:
  There are d-dimensional zonotopes with n zones for which a 2-dimensional
central section has \Omega(n^{d-1}) vertices. For d=3 this was known, with
examples provided by the "Ukrainian easter eggs'' by Eppstein et al. Our result
is asymptotically optimal for all fixed d>=2.


title: Applicability of colour index calibrations to T Tauri stars

abstract:
  We examine the applicability of effective temperature scales of several broad
band colours to T Tauri stars (TTS). We take into account different colour
systems as well as stellar parameters like metallicity and surface gravity
which influence the conversion from colour indices or spectral type to
effective temperature. For a large sample of TTS, we derive temperatures from
broad band colour indices and check if they are consistent in a statistical
sense with temperatures inferred from spectral types. There are some scales
(for V-H, V-K, I-J, J-H, and J-K) which indeed predict the same temperatures as
the spectral types and therefore can be at least used to confirm effective
temperatures. Furthermore, we examine whether TTS with dynamically derived
masses can be used for a test of evolutionary models and effective temperature
calibrations. We compare the observed parameters of the eclipsing T Tauri
binary V1642 Ori A to the predictions of evolutionary models in both the H-R
and the Kiel diagram using temperatures derived with several colour index
scales. We check whether the evolutionary models and the colour index scales
are consistent with coevality and the dynamical masses of the binary
components. It turns out that the Kiel diagram offers a stricter test than the
H-R diagram. Only the evolutionary models of Baraffe et al. (1998) with mixing
length parameter 1.9 and of D'Antona & Mazzitelli (1994, 1997) show consistent
results in the Kiel diagram in combination with some conversion scales of
Houdashelt et al. (2000) and of Kenyon & Hartmann (1995).


title:
A Theory For Particle Settling and Shear-Induced Migration in Thin Film
  Flow

abstract:
  Experiments of particle-laden inclined film flow [Zhou, Dupuy, Bertozzi, and
Hosoi, Phys. Rev. Lett. 94 (2005)] have displayed different settling behaviors
depending on the particle concentration $\phi$ and angle of inclination
$\theta$, in which particles accumulate on the substrate or near the advancing
contact line, or remain mixed. Zhou et al. presented a lubrication model that
captures the qualitative behavior of the high-$\phi$, high-$\theta$ regime,
characterized by a particle-rich ridge near the contact line, but cannot
explain the other observed settling behaviors. This work presents a model in
which $\phi$ varies through the film depth, unlike Zhou et al.'s model. Average
velocities for the liquid and particulate phases are computed, and the
implications for phase separation are discussed. It is found that the
equilibrium depth profile of $\phi$ is more important than gravitational
settling in the down-slope direction in determining phase separation. The
predicted settling behavior is directly compared with Zhou et al.'s
experimental data.


title: Product groups acting on manifolds

abstract:
  We analyse volume-preserving actions of product groups on Riemannian
manifolds. To this end, we establish a new superrigidity theorem for ergodic
cocycles of product groups ranging in linear groups. There are no a priori
assumptions on the acting groups, except a spectral gap assumption on their
action.
  Our main application to manifolds concerns irreducible actions of Kazhdan
product groups. We prove the following dichotomy: Either the action is
infinitesimally linear, which means that the derivative cocycle arises from
unbounded linear representations of all factors. Otherwise, the action is
measurably isometric, in which case there are at most two factors in the
product group.
  As a first application, this provides lower bounds on the dimension of the
manifold in terms of the number of factors in the acting group. Another
application is a strong restriction for actions of non-linear groups.


title:
A New Determination of the High Redshift Type Ia Supernova Rates with
  the Hubble Space Telescope Advanced Camera for Surveys

abstract:
  We present a new measurement of the volumetric rate of Type Ia supernova up
to a redshift of 1.7, using the Hubble Space Telescope (HST) GOODS data
combined with an additional HST dataset covering the North GOODS field
collected in 2004. We employ a novel technique that does not require
spectroscopic data for identifying Type Ia supernovae (although spectroscopic
measurements of redshifts are used for over half the sample); instead we employ
a Bayesian approach using only photometric data to calculate the probability
that an object is a Type Ia supernova. This Bayesian technique can easily be
modified to incorporate improved priors on supernova properties, and it is
well-suited for future high-statistics supernovae searches in which
spectroscopic follow up of all candidates will be impractical. Here, the method
is validated on both ground- and space-based supernova data having some
spectroscopic follow up. We combine our volumetric rate measurements with low
redshift supernova data, and fit to a number of possible models for the
evolution of the Type Ia supernova rate as a function of redshift. The data do
not distinguish between a flat rate at redshift > 0.5 and a previously proposed
model, in which the Type Ia rate peaks at redshift >1 due to a significant
delay from star-formation to the supernova explosion. Except for the highest
redshifts, where the signal to noise ratio is generally too low to apply this
technique, this approach yields smaller or comparable uncertainties than
previous work.


title: Latitudinal variation of the solar photospheric intensity

abstract:
  We have examined images from the Precision Solar Photometric Telescope (PSPT)
at the Mauna Loa Solar Observatory (MLSO) in search of latitudinal variation in
the solar photospheric intensity. Along with the expected brightening of the
solar activity belts, we have found a weak enhancement of the mean continuum
intensity at polar latitudes (continuum intensity enhancement $\sim0.1 - 0.2%$
corresponding to a brightness temperature enhancement of $\sim2.5{\rm K}$).
This appears to be thermal in origin and not due to a polar accumulation of
weak magnetic elements, with both the continuum and CaIIK intensity
distributions shifted towards higher values with little change in shape from
their mid-latitude distributions. Since the enhancement is of low spatial
frequency and of very small amplitude it is difficult to separate from
systematic instrumental and processing errors. We provide a thorough discussion
of these and conclude that the measurement captures real solar latitudinal
intensity variations.


title: Oscillatory Modes of a Prominence-PCTR-Corona Slab Model

abstract:
  Oscillations of magnetic structures in the solar corona have often been
interpreted in terms of magnetohydrodynamic waves. We study the adiabatic
magnetoacoustic modes of a prominence plasma slab with a uniform longitudinal
magnetic field, surrounded by a prominence-corona transition region (PCTR) and
a coronal medium. Considering linear small-amplitude oscillations, the
dispersion relation for the magnetoacoustic slow and fast modes is deduced
assuming evanescent-like perturbations in the coronal medium. In the system
without PCTR, a classification of the oscillatory modes according to the
polarisation of their eigenfunctions is made in order to distinguish modes with
fast-like or slow-like properties. Internal and external slow modes are
governed by the prominence and coronal properties respectively, and fast modes
are mostly dominated by prominence conditions for the observed wavelengths. In
addition, the inclusion of an isothermal PCTR does not substantially influence
the mode frequencies, but new solutions (PCTR slow modes) are present.


title:
Ambiguities on the Hamiltonian formulation of the free falling particle
  with quadratic dissipation

abstract:
  For a free falling particle moving in a media which has quadratic velocity
force effect on the particle, two equivalent constants of motion, with units of
energy, two Lagrangians, and two Hamiltonians are deduced. These quantities
describe the dynamics of the same classical system. However, their quantization
and the associated statistical mechanics (for an ensemble of particles)
describe two completely different quantum and statistical systems. This is
shown at first order in the dissipative parameter.


title:
The 2+1 flavor topological susceptibility from the asqtad action at 0.06
  fm

abstract:
  We report new data for the topological susceptibility computed on 2+1 flavor
dynamical configurations with lattice spacing 0.06 fm, generated with the
asqtad action. The topological susceptibility is computed by HYP smearing and
compared with rooted staggered chiral perturbation theory as the pion mass goes
to zero. At 0.06 fm, the raw data is already quite close to the continuum
extrapolated values obtained from coarser lattices. These results provide a
further test of the asqtad action with rooted staggered flavors.


title:
High-energy Atmospheric Muon Flux Expected at India-Based Neutrino
  Observatory

abstract:
  We calculate the zenith-angle dependence of conventional and prompt
high-energy muon fluxes at India-Based Neutrino Observatory (INO) depth. This
study demonstrates a possibility to discriminate models of the charm
hadroproduction including the low-x QCD behaviour of hadronic cross-sections
relevant at very high energies.


title:
Spectrum-Generating Algebra for Charged Superstrings in Background Gauge
  Fields

abstract:
  The spectrum-generating algebra (SGA) for charged superstrings placed in
constant background magnetic fields is constructed. Contrary to the neutral
string this algebra is characteristic of including the cyclotron frequency. The
Regge intercept and superconformal anomalies are calculated to be shifted by
the cyclotron frequency and D-brane parameters from the conventional values.


title: Properties of two dimensional sets with small sumset

abstract:
  Let $A, B\subseteq \mathbb{R}^2$ be finite, nonempty subsets, let $s\geq 2$
be an integer, and let $h_1(A,B)$ denote the minimal number $t$ such that there
exist $2t$ (not necessarily distinct) parallel lines,
$\ell_1,...,\ell_{t},\ell'_1,...,\ell'_{t}$, with $A\subseteq
\bigcup_{i=1}^{t}\ell_i$ and $B\subseteq\bigcup_{i=1}^{t}\ell'_i$. Suppose
$h_1(A,B)\geq s$. Then we show that:
  (a) if $||A|-|B||\leq s$ and $|A|+|B|\geq 4s^2-6s+3$, then $$|A+B|\geq
(2-\frac 1 s)(|A|+|B|)-2s+1;$$
  (b) if $|A|\geq |B|+s$ and $|B|\geq 2s^2-{7/2}s+{3/2}$, then $$|A+B|\geq
|A|+(3-\frac 2 s)|B|-s;$$
  (c) if $|A|\geq {1/2}s(s-1)|B|+s$ and either $|A|>
{1/8}(2s-1)^2|B|-{1/4}(2s-1)+\frac{(s-1)^2}{2(|B|-2)}$ or $|B|\geq
\frac{2s+4}{3}$, then $$|A+B|\geq |A|+s(|B|-1).$$
  This extends the 2-dimensional case of the Freiman $2^d$--Theorem to distinct
sets $A$ and $B$, and, in the symmetric case $A=B$, improves the best prior
known bound for $|A|+|B|$ (due to Stanchescu, and which was cubic in $s$) to an
exact value.
  As part of the proof, we give general lower bounds for two dimensional
subsets that improve the 2-dimensional case of estimates of Green and Tao and
of Gardner and Gronchi, and that generalize the 2-dimensional case of the
Brunn-Minkowski Theorem.


title: Electron Spin or "Classically Non-Describable Two-Valuedness"

abstract:
  In December 1924 Wolfgang Pauli proposed the idea of an inner degree of
freedom of the electron, which he insisted should be thought of as genuinely
quantum mechanical in nature. Shortly thereafter Ralph Kronig and,
independently, Samuel Goudsmit and George Uhlenbeck took up a less radical
stance by suggesting that this degree of freedom somehow corresponded to an
inner rotational motion, though it was unclear from the very beginning how
literal one was actually supposed to take this picture, since it was
immediately recognised (already by Goudsmit and Uhlenbeck) that it would very
likely lead to serious problems with Special Relativity if the model were to
reproduce the electron's values for mass, charge, angular momentum, and
magnetic moment. However, probably due to the then overwhelming impression that
classical concepts were generally insufficient for the proper description of
microscopic phenomena, a more detailed reasoning was never given. In this
contribution I shall investigate in some detail what the restrictions on the
physical quantities just mentioned are, if they are to be reproduced by rather
simple classical models of the electron within the framework of Special
Relativity. It turns out that surface stresses play a decisive role and that
the question of whether a classical model for the electron does indeed
contradict Special Relativity can only be answered on the basis of an
\emph{exact} solution, which has hitherto not been given.


title: Minimal Flavor Violation, Seesaw, and R-parity

abstract:
  The Minimal Flavor Violation hypothesis (MFV) is extended to the R-parity
violating MSSM, supplemented with a simple seesaw mechanism. The requirement of
MFV is shown to suppress lepton and baryon-number violating couplings
sufficiently to pass all experimental bounds, in particular those for proton
decay, and is thus a viable alternative to R-parity. The phenomenological
consequences for FCNC, LFV and colliders are briefly discussed. Typically, MFV
predicts sizeable baryon-number violation in some characteristic channels, like
single stop resonant production.


title: An Alternative Look To Precession In Accretion Disks

abstract:
  We have considered precession in accretion disks in which a second moment of
inertia relative to an axis perpendicular to the axis of rotation may be very
important. This formalism, that takes into account the precession contribution
to the angular momentum, is based on the existence of a parameter $\it p$ which
determines three characteristic densities resulting from the averaging process
and imposes constraints on the actual disk density. It is shown that the
precession velocity will lie in a three branch solution, and depends on how
large is the disk actual density as compared to the characteristic densities.
Besides the large spread on the solution for the precession velocity, depending
on the density strength, it may be prograde and retrograde. It is shown that
the keplerian thin disk, with very large density values compared to
characteristic ones, only precesses very far away from the primary object,
which implies very large precession periods. For other models, the disk will
thicken, with large deviations from the keplerian approximation. Constraints on
the density only will be effective for very large values of the ratio ${{\dot
M} \over M_{p}}$, respectively, accretion rate and mass of the primary. Under
this condition, the structure of the precessing region is found. Lower bounds
on the precession period are found for not so large values of this ratio.
Deviations from the mean precessional motion are considered. It is shown that
these deviations result in periodic motions as long as the time scales
associated to them are comparable to the remaining time scales. Otherwise, they
result in misalignment motions, forcing the plane of the disk to become normal
to the orbital plane of the secondary.


title:
Friedel oscillations of Density of States in a one-dimensional Mott
  insulator and Incommensurate Charge Density Wave/Superconductor

abstract:
  Oscillations of local density of states generated by a single scalar impurity
potential are calculated for one-dimensional systems with dynamically generated
charge or spin gap. At zero temperature the oscillations develop at finite wave
vector ($\pi$ for the Mott insulator and $2k_F$ for ICDW/SC) and at frequencies
larger than the soliton spectral gap $m$. Their amplitude has a broad maximum
at $\omega \approx 3m$, where $m$ is the gap magnitude.


title:
Poisson convergence for the largest eigenvalues of Heavy Tailed Random
  Matrices

abstract:
  We study the statistics of the largest eigenvalues of real symmetric and
sample covariance matrices when the entries are heavy tailed. Extending the
result obtained by Soshnikov in \cite{Sos1}, we prove that, in the absence of
the fourth moment, the top eigenvalues behave, in the limit, as the largest
entries of the matrix.


title: Color-octet scalars at the LHC

abstract:
  Color-octet scalars, if present at the TeV scale, will be produced in
abundance at the LHC. We discuss in some detail the phenomenology of scalars in
the (8,2)_{1/2} representation, recently identified by Manohar and Wise as an
addition to the standard-model Higgs sector consistent with the principle of
minimal flavor violation. Couplings of this multiplet to the Higgs lift the
mass degeneracy among its states, possibly allowing for two-body decays of a
heavier colored scalar to a lighter one and a gauge boson. We perform a
renormalization group analysis of these couplings and find that limits from
Tevatron searches leave little room for these decays. This fact, and the
assumption of minimal flavor violation, lead us to study the case where the
octets decay to the heaviest kinematically accessible fermion pairs. Focusing
on pair-production events leading to (t t-bar t t-bar), (b b-bar b b-bar), and
(b b-bar t t-bar) final states, we find that discovery at the LHC should be
possible up to masses exceeding 1 TeV.


title: Shape Fluctuations in Randomly Stirred Dilute Emulsions

abstract:
  In this paper we consider the effects of the interaction between droplets or
other deformable objects in an emulsion under random stirring of the host
fluid. Our main interest is to obtain autocorrelation functions of the shape
fluctuations in such randomly stirred host fluids, beyond the dilute limit
regime. Thus, a system of deformable objects immersed in a host liquid that is
randomly stirred is considered, where the objects interact with each other via
the host liquid. Keeping expressions in the first order in the density of
objects and in deviation of objects shapes from spherical, the shape of each
object is expanded in spherical harmonic modes and the correlations of these
modes are derived. The special case of objects that are governed by surface
tension is investigated. The interaction between objects is explicitly
formulated and the deformation correlations are obtained.


title: One-loop fluctuations of semi-local self-dual vortices

abstract:
  Mass shifts induced by one-loop fluctuations of semi-local self-dual vortices
are computed. The procedure is based on canonical quantization and heat kernel/
zeta function regularization methods. The issue of the survival of the
classical degeneracy in the semi-classical regime is explored.


title: On the evolution of clustering of 24um-selected galaxies

abstract:
  This paper investigates the clustering properties of a complete sample of
1041 24um-selected sources brighter than F[24um]=400 uJy in the overlapping
region between the SWIRE and UKIDSS UDS surveys. We have concentrated on the
two (photometric) interval ranges z=[0.6-1.2] (low-z sample) and z>1.6 (high-z
sample) as it is in these regions were we expect the mid-IR population to be
dominated by intense dust-enshrouded activity such as star formation and black
hole accretion. Investigations of the angular correlation function produce a
correlation length are r0~15.9 Mpc for the high-z sample and r0~8.5 Mpc for the
low-z one. Comparisons with physical models reveal that the high-z sources are
exclusively associated with very massive (M>~10^{13} M_sun)haloes, comparable
to those which locally host groups-to-clusters of galaxies, and are very common
within such (rare) structures. Conversely, lower-z galaxies are found to reside
in smaller halos (M_min~10^{12} M_sun) and to be very rare in such systems.
While recent studies have determined a strong evolution of the 24um luminosity
function between z~2 and z~0, they cannot provide information on the physical
nature of such an evolution. Our clustering results instead indicate that this
is due to the presence of different populations of objects inhabiting different
structures, as active systems at z<~1.5 are found to be exclusively associated
with low-mass galaxies, while very massive sources appear to have concluded
their active phase before this epoch. Finally, we note that the small-scale
clustering data seem to require steep profiles for the distribution of galaxies
within their halos. This is suggestive of close encounters and/or mergers which
could strongly favour both AGN and star-formation activity.


title: A Scenario for a Natural Origin of Our Universe

abstract:
  A mathematical model of the natural origin of our universe is presented. The
model is based only on well-established physics. No claim is made that this
model uniquely represents exactly how the universe came about. But the
viability of a single model serves to refute any assertions that the universe
cannot have come about by natural means.


title: Phase operator of the quantum supersymmetric harmonic oscillator

abstract:
  After a brief introduction recalling how, in the limit in which the mass and
the electric charge of the electron and the positron tend to zero, Quantum
Electrodynamics reduces to a collection of uncoupled quantum supersymmetric
harmonic oscillators, the phase operator of the quantum fermionic harmonic
oscillator and of the quantum supersymmetric harmonic oscillator are introduced
and their properties analyzed. It is then shown that the phase operator of a
supersymmetric harmonic oscillator is a Goldstone operator at any strictly
positive temperature (finite or infinite).


title: On gradient bounds for the heat kernel on the Heisenberg group

abstract:
  It is known that the couple formed by the two dimensional Brownian motion and
its L\'evy area leads to the heat kernel on the Heisenberg group, which is one
of the simplest sub-Riemannian space. The associated diffusion operator is
hypoelliptic but not elliptic, which makes difficult the derivation of
functional inequalities for the heat kernel. However, Driver and Melcher and
more recently H.-Q. Li have obtained useful gradient bounds for the heat kernel
on the Heisenberg group. We provide in this paper simple proofs of these
bounds, and explore their consequences in terms of functional inequalities,
including Cheeger and Bobkov type isoperimetric inequalities for the heat
kernel.


title:
Numerical wave optics and the lensing of gravitational waves by globular
  clusters

abstract:
  We consider the possible effects of gravitational lensing by globular
clusters on gravitational waves from asymmetric neutron stars in our galaxy. In
the lensing of gravitational waves, the long wavelength, compared with the
usual case of optical lensing, can lead to the geometrical optics approximation
being invalid, in which case a wave optical solution is necessary. In general,
wave optical solutions can only be obtained numerically. We describe a
computational method that is particularly well suited to numerical wave optics.
This method enables us to compare the properties of several lens models for
globular clusters without ever calling upon the geometrical optics
approximation, though that approximation would sometimes have been valid.
Finally, we estimate the probability that lensing by a globular cluster will
significantly affect the detection, by ground-based laser interferometer
detectors such as LIGO, of gravitational waves from an asymmetric neutron star
in our galaxy, finding that the probability is insignificantly small.


title:
Clues to Globular Cluster Evolution from Multiwavelength Observations of
  Extragalactic Systems

abstract:
  We present a study of the globular cluster (GC) systems of nearby elliptical
and S0 galaxies at a variety of wavelengths from the X-ray to the infrared. Our
analysis shows that roughly half of the low mass X-ray binaries (LMXBs), that
are the luminous tracers of accreting neutron star or black hole systems, are
in clusters. There is a surprisingly strong correlation between the LMXB
frequency and the metallicity of the GCs, with metal-rich GCs hosting three
times as many LMXBs as metal-poor ones, and no convincing evidence of a
correlation with GC age so far. In some of the galaxies the LMXB formation rate
varies with GC color even within the red peak of the typical bimodal cluster
color distribution, providing some of the strongest evidence to date that there
are metallicity variations within the metal-rich GC peak as is expected in a
hierarchical galaxy formation scenario. We also note that any analysis of
subtler variations in GC color distributions must carefully account for both
statistical and systematic errors. We caution that some published GC
correlations, such as the apparent 'blue-tilt' or mass-metallicity effect might
not have a physical origin and may be caused by systematic observational
biases.


title:
Application of the dual-kinetic-balance sets in the relativistic
  many-body problem of atomic structure

abstract:
  The dual-kinetic-balance (DKB) finite basis set method for solving the Dirac
equation for hydrogen-like ions [V. M. Shabaev et al., Phys. Rev. Lett. 93,
130405 (2004)] is extended to problems with a non-local spherically-symmetric
Dirac-Hartree-Fock potential. We implement the DKB method using B-spline basis
sets and compare its performance with the widely-employed approach of Notre
Dame (ND) group [W.R. Johnson and J. Sapirstein, Phys. Rev. Lett. 57, 1126
(1986)]. We compare the performance of the ND and DKB methods by computing
various properties of Cs atom: energies, hyperfine integrals, the
parity-non-conserving amplitude of the $6s_{1/2}-7s_{1/2}$ transition, and the
second-order many-body correction to the removal energy of the valence
electrons. We find that for a comparable size of the basis set the accuracy of
both methods is similar for matrix elements accumulated far from the nuclear
region. However, for atomic properties determined by small distances, the DKB
method outperforms the ND approach. In addition, we present a strategy for
optimizing the size of the basis sets by choosing progressively smaller number
of basis functions for increasingly higher partial waves. This strategy
exploits suppression of contributions of high partial waves to typical
many-body correlation corrections.


title:
Solving Schrodinger Equation for Three-Electron Quantum Systems by the
  Use of The Hyperspherical Function Method

abstract:
  A new mathematical model for the description of three electron quantum dots
in 2D space is created, and ground states of this system in external magnetic
field is investigated. The Schrodinger equation for three two-dimensional
electrons is solved by the use of the Hyperspherical Function Method (HFM) It
is shown that the HFM allows us to separate the center of mass movement and
solve Schrodinger Equation with the use of the logarithmic potential of
electron-electron interactions. Ground state energy levels as function of the
magnetic field frequency is obtained.


title: Quantum/Classical Interface: Fermion Spin

abstract:
  Although intrinsic spin is usually viewed as a purely quantum property with
no classical analog, we present evidence here that fermion spin has a classical
origin rooted in the geometry of three-dimensional physical space. Our approach
to the quantum/classical interface is based on a formulation of relativistic
classical mechanics that uses spinors. Spinors and projectors arise naturally
in the Clifford's geometric algebra of physical space and not only provide
powerful tools for solving problems in classical electrodynamics, but also
reproduce a number of quantum results. In particular, many properites of
elementary fermions, as spin-1/2 particles, are obtained classically and relate
spin, the associated g-factor, its coupling to an external magnetic field, and
its magnetic moment to Zitterbewegung and de Broglie waves. The relationship is
further strengthened by the fact that physical space and its geometric algebra
can be derived from fermion annihilation and creation operators. The approach
resolves Pauli's argument against treating time as an operator by recognizing
phase factors as projected rotation operators.


title:
Population transfer between two quantum states by piecewise chirping of
  femtosecond pulses: Theory and experiment

abstract:
  We propose and demonstrate the method of population transfer by piecewise
adiabatic passage between two quantum states. Coherent excitation of a
two-level system with a train of ultrashort laser pulses is shown to reproduce
the effect of an adiabatic passage, conventionally achieved with a single
frequency-chirped pulse. By properly adjusting the amplitudes and phases of the
pulses in the excitation pulse train, we achieve complete and robust population
transfer to the target state. The effect is demonstrated experimentally by
observing piecewise excitation of Rubidium atoms from 5s_1/2 to 5p_1/2
electronic state. We show that similarly to the conventional adiabatic passage,
the piecewise process is insensitive to the total excitation energy as long as
the adiabaticity conditions are satisfied. The piecewise nature of the process
suggests that robust and selective population transfer could be implemented in
a variety of complex quantum systems beyond the two-level approximation.


title: Cuspidal representations which are not strongly cuspidal

abstract:
  We give a description of all the cuspidal representations of
$\mathrm{GL}_4(\mathfrak{o}_2)$, where $\mathfrak{o}_2$ is a finite ring coming
from the ring of integers in a local field, modulo the square of its maximal
ideal $\mathfrak{p}$. This shows in particular the existence of representations
which are cuspidal, yet are not strongly cuspidal, that is, do not have orbit
with irreducible characteristic polynomial mod $\mathfrak{p}$. It has been
shown by Aubert, Onn, and Prasad that this phenomenon cannot occur for
$\mathrm{GL}_n$, when $n$ is prime.


title: Local acyclic fibrations and the de Rham complex

abstract:
  We reinterpret algebraic de Rham cohomology for a possibly singular complex
variety X as sheaf cohomology in the site of smooth schemes over X with
Voevodsky's h-topology. Our results extend to the algebraic de Rham complex as
well. Our main technique is to extend Cech cohomology of hypercovers to
arbitrary local acyclic fibrations of simplicial presheaves.


title: Warm inflation on the brane

abstract:
  In this paper, warm inflationary models on a brane scenario are studied. Here
we consider slow-roll inflation and high-dissipation regime in a high-energy
scenario. General conditions required for these models to be realizable are
derived. We describe scalar and tensor perturbations for these scenarios.
Specifically we study power-law potentials considering a dissipation parameter
to be a constant on the one hand and $\phi$ dependent on the other hand. We use
recent astronomical observations to restrict the parameters appearing in our
model.


title: Advances towards pB11 Fusion with the Dense Plasma Focus

abstract:
  The prospects for achieving net energy production with pB11 fuel have
recently considerably brightened. Studies have shown that the multi-GG field
potentially obtainable with modest dense plasma focus devices have the effect
of reducing the flow of energy from the ions to the electrons and thus
suppressing bremsstrahlung radiation that cools the plasma. We report here on
new simulations that indicate that net energy production may be achievable in
high-magnetic-field devices at peak currents as low as 2.3 MA. While these
simulations only model the dense plasmoid formed in the focus, new simulation
techniques can allow a full particle-in-cell simulation of DPF functioning over
the wide range of time and space scales needed. Such simulations will be of
great value in the next round of experiments that will use pB11 fuel.


title:
Nonlinear Dynamical Stability of Newtonian Rotating White Dwarfs and
  Supermassive Stars

abstract:
  We prove general nonlinear stability and existence theorems for rotating star
solutions which are axi-symmetric steady-state solutions of the compressible
isentropic Euler-Poisson equations in 3 spatial dimensions. We apply our
results to rotating and non-rotating white dwarf, and rotating high density
supermassive (extreme relativistic) stars, stars which are in convective
equilibrium and have uniform chemical composition. This paper is a continuation
of our earlier work ([28]).


title: New Higgs physics from the lattice

abstract:
  We report the first results from our comprehensive lattice tool set to
explore non-perturbative aspects of Higgs physics in the Standard Model. We
demonstrate in Higgs-Yukawa models that Higgs mass lower bounds and upper
bounds can be determined in lattice simulations when triviality requires the
necessity of a finite cutoff to maintain non-zero interactions. The vacuum
instability problem is investigated and the lattice approach is compared with
the traditional renormalization group procedure which sets similar goals to
correlate lower and upper Higgs mass bounds with the scale of new physics. A
novel feature of our lattice simulations is the use of Ginsparg-Wilson fermions
to represent the effects of Top quark loops in Higgs dynamics. The need for
chiral lattice fermions is discussed and the approach is extended to full
Top-Higgs-QCD dynamics. We also report results from our large $N_F$ analysis of
Top-Higgs Yukawa models to gain analytic insight and to verify our new lattice
tool set which is deployed in the simulations. The role of non-perturbative
lattice studies to investigate heavy Higgs particle scenarios is illustrated in
extensions of the Standard Model.


title: On cluster algebras with coefficients and 2-Calabi-Yau categories

abstract:
  Building on work by Geiss-Leclerc-Schroer and by Buan-Iyama-Reiten-Scott we
investigate the link between certain cluster algebras with coefficients and
suitable 2-Calabi-Yau categories. These include the cluster-categories
associated with acyclic quivers and certain Frobenius subcategories of module
categories over preprojective algebras. Our motivation comes from the
conjectures formulated by Fomin and Zelevinsky in `Cluster algebras IV:
Coefficients'. We provide new evidence for Conjectures 5.4, 6.10, 7.2, 7.10 and
7.12 and show by an example that the statement of Conjecture 7.17 does not
always hold.


title:
Electronic correlation in nanoscale junctions: Comparison of the GW
  approximation to a numerically exact solution of the single-impurity Anderson
  model

abstract:
  The impact of electronic correlation in nanoscale junctions, e.g. formed by
single molecules, is analyzed using the single-impurity Anderson model.
Numerically exact Quantum Monte Carlo calculations are performed to map out the
orbital filling, linear response conductance and spectral function as a
function of the Coulomb interaction strength and the impurity level position.
These numerical results form a benchmark against which approximate, but more
broadly applicable, approaches to include electronic correlation in transport
can be compared. As an example, the self consistent GW approximation has been
implemented for the Anderson model and the results compared to this benchmark.
For weak coupling or for level positions such that the impurity is either
nearly empty or nearly full, the GW approximation is found to be accurate.
However, for intermediate or strong coupling, the GW approximation does not
properly represent the impact of spin or charge fluctuations. Neither the
spectral function nor the linear response conductance are accurately given
across the Coulomb blockade plateau and well into the mixed valence regimes.


title: Intersubband decay of 1-D exciton resonances in carbon nanotubes

abstract:
  We have studied intersubband decay of E22 excitons in semiconducting carbon
nanotubes experimentally and theoretically. Photoluminescence excitation line
widths of semiconducting nanotubes with chiral indicess (n, m) can be mapped
onto a connectivity grid with curves of constant (n-m) and (2n+m). Moreover,
the global behavior of E22 linewidths is best characterized by a strong
increase with energy irrespective of their (n-m) mod(3)= \pm 1 family
affiliation. Solution of the Bethe-Salpeter equations shows that the E22
linewidths are dominated by phonon assisted coupling to higher momentum states
of the E11 and E12 exciton bands. The calculations also suggest that the
branching ratio for decay into exciton bands vs free carrier bands,
respectively is about 10:1.


title: Dynamics of Localized Waves

abstract:
  We have measured pulsed microwave transmission through quasi-1D samples with
lengths up to three localization lengths. For times approaching four times the
diffusion time \tau_D, transmission is diffusive in accord with the
self-consistent theory of localization for the renormalized diffusion
coefficient in space and frequency, D(z,\Omega). For longer times, the
transmission decay rate first agrees with and later falls increasingly below
the self-consistent theory. Beyond the Heisenberg time, the decay rate
approaches the predictions of a dynamic single parameter scaling model which
reflects the decay of long-lived localized modes and converges to the results
of 1D simulations.


title: CP-violation in $b \to s$ Penguin Decays at BaBar

abstract:
  We present the new and updated $BABAR$ measurements of CP-violation studies
for many $b\to s $ penguin decay modes. We report the first observation of
mixing-induced CP-violation in $B^0 \to \eta ^{'} K^0$ with a significance
(including systematic uncertainties) of 5.5$\sigma$. We also present the first
observation of the decay $B^0 \to \rho ^0 K^0$. Using the time-dependent Dalitz
plot analysis of $B^0\to K^+K^- K^0$ decay, the CP-parameters $\mathcal A_{CP}$
and $\beta_{eff}$ are measured with $4.8\sigma$ significance, and we reject the
solution near $\pi /2 - \beta_{eff}$ at $4.5\sigma$. We also present the
updated measurements of CP-violating parameters for $B^0 \to K_S^0 \pi ^0$,
$K_S^0K_S^0K_S^0$ and $\pi ^0 \pi ^0 K_S^0$ decays. An updated measurements of
the CP-violating charge asymmetries for $B^{\pm}\to \eta ^{'} K^{\pm}$, $\eta
K^{\pm}$, $\omega K^{\pm}$ decays are also presented. The measurements are
based on the data sample recorded at the $\Upsilon (4S)$ resonance with $BABAR$
detector at the PEP-II $B$-meson Factory at SLAC.


title: Exponent Inequalities in Dynamical Systems

abstract:
  In this letter we derive exponent inequalities relating the dynamic exponent
$z$ to the steady state exponent $\Gamma$ for a general class of stochastically
driven dynamical systems. We begin by deriving a general exact inequality,
relating the response function and the correlation function, from which the
various exponent inequalities emanate. We then distinguish between two classes
of dynamical systems and obtain different and complementary inequalities
relating $z$ and $\Gamma$. The consequences of those inequalities for a wide
set of dynamical problems, including critical dynamics and
Kardar-Parisi-Zhang-like problems are discussed.

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


title:
Superfluid-insulator transition and BCS-BEC crossover in dirty ultracold
  Fermi gas

abstract:
  Superfluid-insulator transition in an ultracold Fermi gas in the external
disorder potential of the amplitude $V_0$ is studied as a function of the
concentration of the gas $n$ and magnetic field $B$ in the presence of the
Feshbach resonance. We find the zero temperature phase diagrams in the plane
($B,n$) at a given $V_0$ and in the plane $(V_0, n)$ at a given $B$. Our
results for BEC side of the diagram are also valid for the superfluid-insulator
transition in a Bose gas.


title: Unveiling dark halos in lensing galaxies

abstract:
  We present a spatially resolved comparison of the stellar-mass and total-mass
surface distributions of nine early-type galaxies. The galaxies are a subset of
the Sloan Lens ACS survey (or SLACS; Bolton et al. 2006). The total-mass
distributions are obtained by exploring pixelated mass models that reproduce
the lensed images. The stellar-mass distributions are derived from population
synthesis models fit to the photometry of the lensing galaxies. Uncertainties -
mainly model degeneracies - are also computed. Stars can account for all the
mass in the inner regions. A Salpeter IMF actually gives too much stellar mass
in the inner regions and hence appears ruled out. Dark matter becomes
significant by the half-light radius and becomes increasingly dominant at
larger radii. The stellar and dark components are closely aligned, but the
actual ellipticities are not correlated. Finally, we attempt to intuitively
summarize the results by rendering the density, stellar-vs-dark ratio, and
uncertainties as false-colour maps.


title:
Resolving the Formation of Protogalaxies. III. Feedback from the First
  Stars

abstract:
  The first stars form in dark matter halos of masses ~10^6 M_sun as suggested
by an increasing number of numerical simulations. Radiation feedback from these
stars expels most of the gas from their shallow potential well of their
surrounding dark matter halos. We use cosmological adaptive mesh refinement
simulations that include self-consistent Population III star formation and
feedback to examine the properties of assembling early dwarf galaxies. Accurate
radiative transport is modeled with adaptive ray tracing. We include supernova
explosions and follow the metal enrichment of the intergalactic medium. The
calculations focus on the formation of several dwarf galaxies and their
progenitors. In these halos, baryon fractions in 10^8 solar mass halos decrease
by a factor of 2 with stellar feedback and by a factor of 3 with supernova
explosions. We find that radiation feedback and supernova explosions increase
gaseous spin parameters up to a factor of 4 and vary with time. Stellar
feedback, supernova explosions, and H_2 cooling create a complex, multi-phase
interstellar medium whose densities and temperatures can span up to 6 orders of
magnitude at a given radius. The pair-instability supernovae of Population III
stars alone enrich the halos with virial temperatures of 10^4 K to
approximately 10^{-3} of solar metallicity. We find that 40% of the heavy
elements resides in the intergalactic medium (IGM) at the end of our
calculations. The highest metallicity gas exists in supernova remnants and very
dilute regions of the IGM.


title: Formation of central massive objects via tidal compression

abstract:
  For a density that is not too sharply peaked towards the center, the local
tidal field becomes compressive in all three directions. Available gas can then
collapse and form a cluster of stars in the center, including or even being
dominated by a central black hole. We show that for a wide range of
(deprojected) Sersic profiles in a spherical potential, the tidal forces are
compressive within a region which encloses most of the corresponding light of
observed nuclear clusters in both late-type and early-type galaxies. In such
models, tidal forces become disruptive nearly everywhere for relatively large
Sersic indices n >= 3.5. We also show that the mass of a central massive object
(CMO) required to remove all radial compressive tidal forces scales linearly
with the mass of the host galaxy. If CMOs formed in (progenitor) galaxies with
n ~ 1, we predict a mass fraction of ~ 0.1-0.5%, consistent with observations
of nuclear clusters and super-massive black holes. While we find that tidal
compression possibly drives the formation of CMOs in galaxies, beyond the
central regions and on larger scales in clusters disruptive tidal forces might
contribute to prevent gas from cooling.


title:
String junctions in curved backgrounds, their stability and dyon
  interactions in SYM

abstract:
  We provide a systematic construction of string junctions in curved
backgrounds which are relevant in computing, within the gauge/gravity
correspondence, the interaction energy of heavy dyons, notably of
quark-monopole pairs, in strongly coupled SYM theories. To isolate the
configurations of physical interest we examine their stability under small
fluctuations and prove several general statements. We present all details, in
several examples, involving non-extremal and multicenter D3-brane backgrounds
as well as the Rindler space. We show that a string junction could be
perturbatively stable even in branches that are not energetically the most
favorable ones. We present a mechanical analog of this phenomenon.


title:
The Turbulent Story of X-ray Bursts: Effects of Shear Mixing on
  Accreting Neutron Stars

abstract:
  During accretion, a neutron star (NS) is spun up as angular momentum is
transported through its liquid surface layers. We study the resulting
differentially rotating profile, focusing on the impact this has for type I
X-ray bursts. The viscous heating is found to be negligible, but turbulent
mixing can be activated. Mixing has the greatest impact when the buoyancy at
the compositional discontinuity between accreted matter and ashes is overcome.
This occurs preferentially at high accretion rates or low spin frequencies and
may depend on the ash composition from the previous burst. We then find two new
regimes of burning. The first is ignition in a layer containing a mixture of
heavier elements with recurrence times as short as ~5-30 minutes, similar to
short recurrence time bursts. When mixing is sufficiently strong, a second
regime is found where accreted helium mixes deep enough to burn stably,
quenching X-ray bursts altogether. The carbon-rich material produced by stable
helium burning would be important for triggering and fueling superbursts.


title:
The Importance of Satellite Quenching for the Build-Up of the Red
  Sequence of Present Day Galaxies

abstract:
  In the current paradigm, red sequence galaxies are believed to have formed as
blue disk galaxies that subsequently had their star formation quenched. Since
red-sequence galaxies typically have an early-type morphology, the transition
from the blue to the red sequence also involves a morphological transformation.
In this paper we study the impact of transformation mechanisms that operate
only on satellite galaxies, such as strangulation, ram-pressure stripping and
galaxy harassment. Using a large galaxy group catalogue constructed from the
SDSS, we compare the colors and concentrations of satellites galaxies to those
of central galaxies of the same stellar mass, adopting the hypothesis that the
latter are the progenitors of the former. On average, satellites are redder and
more concentrated than central galaxies of the same stellar mass.
Central-satellite pairs that are matched in both stellar mass and color,
however, show no average concentration difference, indicating that the
transformation mechanisms affect color more than morphology. The color and
concentration differences of matched central-satellite pairs are completely
independent of the halo mass of the satellite galaxy, indicating that
satellite-specific transformation mechanisms are equally efficient in haloes of
all masses. This strongly favors strangulation as the main quenching mechanism
for satellite galaxies. Finally, we determine the relative importance of
satellite quenching for the build-up of the red sequence. We find that roughly
70 percent of red sequence satellite galaxies with a stellar mass of 10^9 Msun
had their star formation quenched as satellites. This drops rapidly to zero
with increasing stellar mass, indicating that a significant fraction of red
satellites were already quenched before they became a satellite.


title:
A 15.65 solar mass black hole in an eclipsing binary in the nearby
  spiral galaxy Messier 33

abstract:
  Stellar-mass black holes are discovered in X-ray emitting binary systems,
where their mass can be determined from the dynamics of their companion stars.
Models of stellar evolution have difficulty producing black holes in close
binaries with masses >10 solar masses, which is consistent with the fact that
the most massive stellar black holes known so all have masses within 1 sigma of
10 solar masses. Here we report a mass of 15.65 +/- 1.45 solar masses for the
black hole in the recently discovered system M33 X-7, which is located in the
nearby galaxy Messier 33 (M33) and is the only known black hole that is in an
eclipsing binary. In order to produce such a massive black hole, the progenitor
star must have retained much of its outer envelope until after helium fusion in
the core was completed. On the other hand, in order for the black hole to be in
its present 3.45 day orbit about its 70.0 +/- 6.9 solar mass companion, there
must have been a ``common envelope'' phase of evolution in which a significant
amount of mass was lost from the system. We find the common envelope phase
could not have occured in M33 X-7 unless the amount of mass lost from the
progenitor during its evolution was an order of magnitude less than what is
usually assumed in evolutionary models of massive stars.