title:
The Co-evolution of Galaxies, Black Holes, and AGN in a Hierarchical
  Universe

abstract:
  The observational link between Supermassive Black Holes (SMBH) and galaxies
at low redshift seems to be very tight, and statistically the global evolution
of star formation activity and BH accretion activity also seem to trace each
other closely. However, pinning down the co-evolution of galaxies and BH on an
object-by-object basis remains elusive. I present results from new models for
the joint evolution of galaxies, SMBH, and AGN, which may be able to help
resolve some of the observational puzzles. A unique aspect of these models is
our treatment of self-regulated BH growth based on hydrodynamic simulations of
galaxy-galaxy mergers. Although these models do quite well at reproducing the
observed evolution of galaxies, they do not reproduce the observed history of
BH accretion, predicting too much early accretion and not enough at late times.
I suggest two possible resolutions to this problem.


title:
Built-in surface field effect on the 180-degree domain wall structure in
  ferroics

abstract:
  We consider the influence of the built-in surface field on the 180-degree
domain wall profile in primary ferroics within Landau-Ginsburg-Devonshire
phenomenological approach. We predict the effect of domain wall bending near
the surface caused by the built-in field and derived corresponding approximate
analytical expressions. At that the higher is the surface energy contribution
(i.e. the smaller is corresponding extrapolation length) and/or the higher is
the field, the stronger is the bending effect. Built-in surface field is one of
the possible mechanisms of domain wall near surface broadening recently
observed in the ferroics.


title:
Bulk asymptotics of skew-orthogonal polynomials for quartic double well
  potential and universality in the matrix model

abstract:
  We derive bulk asymptotics of skew-orthogonal polynomials (sop)
$\pi^{\bt}_{m}$, $\beta=1$, 4, defined w.r.t. the weight $\exp(-2NV(x))$, $V
(x)=gx^4/4+tx^2/2$, $g>0$ and $t<0$. We assume that as $m,N \to\infty$ there
exists an $\epsilon > 0$, such that $\epsilon\leq (m/N)\leq \lambda_{\rm
cr}-\epsilon$, where $\lambda_{\rm cr}$ is the critical value which separates
sop with two cuts from those with one cut. Simultaneously we derive asymptotics
for the recursive coefficients of skew-orthogonal polynomials. The proof is
based on obtaining a finite term recursion relation between sop and orthogonal
polynomials (op) and using asymptotic results of op derived in \cite{bleher}.
Finally, we apply these asymptotic results of sop and their recursion
coefficients in the generalized Christoffel-Darboux formula (GCD) \cite{ghosh3}
to obtain level densities and sine-kernels in the bulk of the spectrum for
orthogonal and symplectic ensembles of random matrices.


title: Charge Imbalance and Bilayer 2D Electron Systems at $\nu_T = 1$

abstract:
  We use interlayer tunneling to study bilayer 2D electron systems at $\nu_T =
1$ over a wide range of charge density imbalance, $\Delta \nu =\nu_1-\nu_2$,
between the two layers. We find that the strongly enhanced tunneling associated
with the coherent excitonic $\nu_T = 1$ phase at small layer separation can
survive at least up to an imbalance of $\Delta \nu$ = 0.5, i.e $(\nu_1, \nu_2)$
= (3/4, 1/4). Phase transitions between the excitonic $\nu_T = 1$ state and
bilayer states which lack significant interlayer correlations can be induced in
three different ways: by increasing the effective interlayer spacing $d/\ell$,
the temperature $T$, or the charge imbalance, $\Delta \nu$. We observe that
close to the phase boundary the coherent $\nu_T = 1$ phase can be absent at
$\Delta \nu$ = 0, present at intermediate $\Delta \nu$, but then absent again
at large $\Delta \nu$, thus indicating an intricate phase competition between
it and incoherent quasi-independent layer states. At zero imbalance, the
critical $d/\ell$ shifts linearly with temperature, while at $\Delta \nu$ = 1/3
the critical $d/\ell$ is only weakly dependent on $T$. At $\Delta \nu$ = 1/3 we
report the first observation of a direct phase transition between the coherent
excitonic $\nu_T = 1$ bilayer integer quantum Hall phase and the pair of single
layer fractional quantized Hall states at $\nu_1$ = 2/3 and $\nu_2=1/3$.


title: Simulating radiation and kinetic processes in relativistic plasmas

abstract:
  Modelling the emission properties of compact high energy sources such as
X-ray binaries, AGN or gamma-ray bursts represents a complex problem.
Contributions of numerous processes participate non linearly to produce the
observed spectra: particle-particle, particle-photon and particle-wave
interactions. In the past decades, numerical simulations have been widely used
to address the key properties of the high energy plasmas present in these
sources. This article presents a code that has been designed to investigate
these questions. It includes most of the relevant processes needed to simulate
the emission of high energy sources. This code solves the time-dependent
kinetic equations for homogeneous, isotropic distributions of photons,
electrons and positrons. No assumption is made on the shape of these
distributions. Have been included so far: syn- chrotron self-absorbed
radiation, Compton scattering, pair production/annihilation, e-e and e-p
Coulomb collisions and some prescriptions for additional particle heating and
acceleration. We also present comparisons with earlier works and some examples
to illustrate the code computational capacities. Previous results are
reproduced qualitatively but some differences are often found in the details of
the particle As a first application of the code, we investigate acceleration by
second order Fermi-like processes and we find that the energy threshold for
acceleration has a crucial influence on the particle distribution and the
emitted spectrum.


title: Optics-less Sensors for Localization of Radiation Sources

abstract:
  A new family of radiation sensors is introduced which do not require any
optics. The sensors consist of arrays of elementary sub-sensors with natural
cosine-law or similar angular sensitivity supplemented with a signal processing
unit that computes optimal statistical estimations of source parameters. We
show, both theoretically and by computer simulation, that such sensors are
capable of accurate localization and intensity estimation of a given number of
radiation sources and of imaging of a given number of sources in known
positions. The accuracy is found to be dependent only on the sub-sensors noise
level, on the number of sub-sensors and on the spacing between radiation
sources.


title: From Inference to Physics

abstract:
  Entropic dynamics, a program that aims at deriving the laws of physics from
standard probabilistic and entropic rules for processing information, is
developed further. We calculate the probability for an arbitrary path followed
by a system as it moves from given initial to final states. For an
appropriately chosen configuration space the path of maximum probability
reproduces Newtonian dynamics.

categories: physics.class-ph cond-mat.stat-mech physics.data-an physics.gen-ph quant-ph


title: Spacetime Foam and Dark Energy

abstract:
  Due to quantum fluctuations, spacetime is foamy on small scales. The degree
of foaminess is found to be consistent with the holographic principle. One way
to detect spacetime foam is to look for halos in the images of distant quasars.
Applying the holographic foam model to cosmology we "predict" that the cosmic
energy density takes on the critical value; and basing only on existing
archived data on active galactic nuclei from the Hubble Space Telescope, we
also "predict" the existence of dark energy which, we argue, is composed of an
enormous number of inert "particles" of extremely long wavelength. We speculate
that these "particles" obey infinite statistics.


title: Trans-Planckian Physics from a Nonlinear Dispersion Relation

abstract:
  We study a particular nonlinear dispersion relation $\omega_p(k_p)$ -- a
series expansion in the physical wavenumber $k_p$ -- for modeling first-order
corrections in the equation of motion of a test scalar field in a de Sitter
spacetime from trans-Planckian physics in cosmology. Using both a numerical
approach and a semianalytical one, we show that the WKB approximation
previously adopted in the literature should be used with caution, since it
holds only when the comoving wavenumber $k\gg aH$. We determine the amplitude
and behavior of the corrections on the power spectrum for this test field.
Furthermore, we consider also a more realistic model of inflation, the
power-law model, using only a numerical approach to determine the corrections
on the power spectrum.


title: Impurity effects on the melting of Ni clusters

abstract:
  We demonstrate that the addition of a single carbon impurity leads to
significant changes in the thermodynamic properties of Ni clusters consisting
of more than a hundred atoms. The magnitude of the change induced is dependent
upon the parameters of the Ni-C interaction. Hence, thermodynamic properties of
Ni clusters can be effectively tuned by the addition of an impurity of a
particular type. We also show that the presence of a carbon impurity
considerably changes the mobility and diffusion of atoms in the Ni cluster at
temperatures close to its melting point. The calculated diffusion coefficients
of the carbon impurity in the Ni cluster can be used for a reliable estimate of
the growth rate of carbon nanotubes.


title: A Toy Model for Gauge-Mediation in Intersecting Brane Models

abstract:
  We discuss the phenomenology of a toy intersecting brane model where
supersymmetry is dynamically broken in an open string hidden sector and
gauge-mediated to the visible sector. Scalar masses ~ TeV are easily
realizable, and R-symmetry is broken. These ideas are easily generalizable to
other intersecting brane models.


title: Quantum bit error rate in modeled atmospheres

abstract:
  The quantum bit error rate is a key quantity in quantum communications. If
the quantum channel is the atmosphere, the information is usually encoded in
the polarization of a photon. A link budget is required, which takes into
account the depolarization of the photon after its interaction with the
atmosphere as well as absorption, scattering and atmospheric emissions. An
experimental setup for the reproduction of a simple model of the atmosphere is
used to evaluate the quantum bit error rate in a BB84 protocol and the results
are presented. This result represents a first step toward the realization of an
optical bench experiment where atmospheric effects are simulated and controlled
for reproducing the effects on a quantum channel in different meteorological
situations.


title:
A search for the standard model Higgs boson in the missing energy and
  acoplanar b-jet topology at sqrt(s) = 1.96 TeV

abstract:
  We report a search for the standard model Higgs boson in the missing energy
and acoplanar b-jet topology, using an integrated luminosity of 0.93 inverse
femtobarn recorded by the D0 detector at the Fermilab Tevatron Collider. The
analysis includes signal contributions from pp->ZH->nu nu b b, as well as from
WH production in which the charged lepton from the W boson decay is undetected.
Neural networks are used to separate signal from background. In the absence of
a signal, we set limits on the cross section of pp->VH times the branching
ratio of H->bb at the 95% C.L. of 2.6 - 2.3 pb, for Higgs boson masses in the
range 105 - 135 GeV, where V=W,Z. The corresponding expected limits range from
2.8 pb - 2.0 pb.


title:
On the Casimir energy for a massive quantum scalar field and the
  Cosmological constant

abstract:
  We present a rigorous, regularization independent local quantum field
theoretic treatment of the Casimir effect for a quantum scalar field of mass
$\mu\ne0$ which yields closed form expressions for the energy density and
pressure. As an application we show that there exist special states of the
quantum field at fixed cosmic time, in which the expectation value of the
renormalized energy-momentum tensor is independent of the space coordinate and
is of the perfect fluid form $g_{\mu,\nu}\rho_{vac}$ with $\rho_{vac}>0$, thus
providing a quantum field theoretic foundation of the Cosmological constant.
Using some values of $\mu$ suggested in the literature for the hypothetical
axion particle, there results a model for dark energy which is consistent with
past and future evolution and is also in good agreement with experimental data.


title: Interface solitons in two-dimensional photonic lattices

abstract:
  We analyze localization of light at the interface separating square and
hexagonal photonic lattices, as recently realized experimentally in
two-dimensional laser-written waveguide arrays in silica glass with
self-focusing nonlinearity [A. Szameit {\em et al.}, Opt. Lett. {\bf 33}, 663
(2008)]. We reveal the conditions for the existence of {\em linear} and {\em
nonlinear} surface states substantially influenced by the lattice topology, and
study the effect of the different symmetries and couplings on the stability of
two-dimensional interface solitons.


title:
Super-leading logarithms in non-global observables in QCD: Colour basis
  independent calculation

abstract:
  In a previous paper we reported the discovery of super-leading logarithmic
terms in a non-global QCD observable. In this short update we recalculate the
first super-leading logarithmic contribution to the 'gaps between jets'
cross-section using a colour basis independent notation. This sheds light on
the structure and origin of the super-leading terms and allows them to be
calculated for gluon scattering processes for the first time.


title:
A Hecke Correspondence Theorem for Automorphic Integrals with Symmetric
  Rational Period Functions on the Hecke Groups

abstract:
  Marvin Knopp developed the theory of automorphic integrals, which generalize
automorphic forms; each automorphic integral has an additional period function
in its automorphic relation. The period functions satisfy relations that arise
from the underlying group relations. Knopp showed that entire automorphic
integrals with rational period functions satisfy a Hecke correspondence
theorem, provided the rational period functions have poles only at 0 or
infinity. For other automorphic integrals each corresponding Dirichlet series
has a functional equation with a remainder term that arises from the nonzero
poles of the rational period function.
  In this paper we prove a Hecke correspondence theorem for a class of
automorphic integrals with rational period functions on the Hecke groups. We
restrict our attention to automorphic integrals of weight that is twice an odd
integer and to rational period functions that satisfy a symmetry property we
call "Hecke-symmetry." We explicate the relationship between the structure of
the rational period functions and the corresponding remainder terms. Each
remainder term satisfies two relations (the second of which is new in this
paper) corresponding to the two relations for the rational period function.


title: On deformed gauge theories and their string/M-theory duals

abstract:
  We present general formulae for the TsT transformation (T-duality, shift,
T-duality) of type II string backgrounds and open string boundary conditions.
The TsT transformation provides a systematic procedure to find string theory
duals of gauge theories with deformed products of fields in the lagrangian, and
the duals can be analyzed by using transformed D-brane probes. As examples
illustrating some features of the deformed theories, we consider the known
backgrounds dual to non-commutative, dipole and beta-deformed N=4 Super
Yang-Mills as well as new backgrounds dual to deformations of the recently
proposed N=6 Chern-Simons-matter theory living on multiple M2-branes on an
orbifold.


title: Spontaneous recoil effects of optical pumping on trapped atoms

abstract:
  The recoil effects of spontaneous photon emissions during optical pumping of
a trapped three-level atom are exactly calculated. Without resort to the
Lamb-Dicke approximation, and considering arbitrary detuning and saturation of
the pump laser, the density of recoil shifts in phase space is derived. It is
shown that this density is not of Gaussian shape, and that it becomes isotropic
in phase space only for a branching ratio corresponding to fluorescence
scattering but unfavorable for optical pumping. The dependence of its
anisotropy on the laser saturation is discussed in the resonant case, and the
mapping of moments of the atom's center-of-mass motion due to the pumping is
presented. Moreover, it is shown how optimum parameters for protecting the
center-of-mass quantum state from pump-induced disturbance depend on the
specific property to be protected.


title: Extensions of positive definite functions on amenable groups

abstract:
  Let $S$ be a subset of a amenable group $G$ such that $e\in S$ and
$S^{-1}=S$. The main result of the paper states that if the Cayley graph of $G$
with respect to $S$ has a certain combinatorial property, then every positive
definite operator-valued function on $S$ can be extended to a positive definite
function on $G$. Several known extension results are obtained as a corollary.
New applications are also presented.


title: Obstructions to the Existence and Squeezing of Lagrangian Cobordisms

abstract:
  Capacities that provide both qualitative and quantitative obstructions to the
existence of a Lagrangian cobordism between two $(n-1)$-dimensional
submanifolds in parallel hyperplanes of $\mathbb{R}^{2n}$ are defined using the
theory of generating families. Qualitatively, these capacities show that, for
example, in $\mathbb R^4$ there is no Lagrangian cobordism between two
$\infty$-shaped curves with a negative crossing when the lower end is
"smaller". Quantitatively, when the boundary of a Lagrangian ball lies in a
hyperplane of $\mathbb{R}^{2n}$, the capacity of the boundary gives a
restriction on the size of a rectangular cylinder into which the Lagrangian
ball can be squeezed.


title: Matrix Factorizations For Non-Abelian Orbifolds

abstract:
  We discuss a prescription to construct fractional branes in Landau-Ginzburg
orbifolds, with particular attention to the case of non-abelian orbifolds. We
analyze in detail a S_3 orbifold and a D_n orbifold and show how the
computation of the spectrum can be carried out explicitly even when the
factorizations involve higher rank matrices.


title: Linear systems and determinantal random point fields

abstract:
  Tracy and Widom showed that fundamentally important kernels in random matrix
theory arise from differential equations with rational coefficients. More
generally, this paper considers symmetric Hamiltonian systems abd determines
the properties of kernels that arise from them. The inverse spectral problem
for self-adjoint Hankel operators gives a sufficient condition for a
self-adjoint operator to be the Hankel operator on $L^2(0, \infty)$ from a
linear system in continuous time; thus this paper expresses certain kernels as
squares of Hankel operators. For a suitable linear system $(-A,B,C)$ with one
dimensional input and output spaces, there exists a Hankel operator $\Gamma$
with kernel $\phi_{(x)}(s+t)=Ce^{-(2x+s+t)A}B$ such that $\det
(I+(z-1)\Gamma\Gamma^\dagger)$ is the generating function of a determinantal
random point field.


title: Density Matrix Renormalization Group study of $^{48}$Cr and $^{56}$Ni

abstract:
  We discuss the development of an angular-momentum-conserving variant of the
Density Matrix Renormalization Group (DMRG) method for use in large-scale
shell-model calculations of atomic nuclei and report a first application of the
method to the ground state of $^{56}$Ni and improved results for $^{48}$Cr. In
both cases, we see a high level of agreement with the exact results. A
comparison of the two shows a dramatic reduction in the fraction of the space
required to achieve accuracy as the size of the problem grows.


title:
The filled skutterudite CeOs$_{4}$As$_{12}$: a hybridization gap
  semiconductor

abstract:
  X-ray diffraction, electrical resistivity, magnetization, specific heat, and
thermoelectric power measurements are presented for single crystals of the new
filled skutterudite compound {\CeOsAs}, which reveal phenomena that are
associated with f - electron - conduction electron hybridization. Valence
fluctuations or Kondo behavior dominates the physics down to $T$ $\sim$ 135 K.
The correlated electron behavior is manifested at low temperatures as a
hybridization gap insulating state. The small energy gap $\Delta$$_1$/k$_B$
$\sim$ 73 K, taken from fits to electrical resistivity data, correlates with
the evolution of a weakly magnetic or nonmagnetic ground state, which is
evident in the magnetization data below a coherence temperature $T$$_{coh}$
$\sim$ 45 K. Additionally, the low temperature electronic specific heat
coefficient is small, $\gamma$ $\sim$ 19 mJ/mol K$^2$. Some results for the
nonmagnetic analogue compound {\LaOsAs} are also presented for comparison
purposes.


title:
Constraints on the High-Density Nuclear Equation of State from Neutron
  Star Observables

abstract:
  Depending on the density reached in the cores of neutron stars, such objects
may contain stable phases of novel matter found nowhere else in the Universe.
This article gives a brief overview of these phases of matter and discusses
astrophysical constraints on the high-density equation of state associated with
ultra-dense nuclear matter.


title:
Stability of Galactic Gaseous Disks and the Formation of Massive
  Clusters

abstract:
  We study gravitational instabilities in disks, with special attention to the
most massive clumps that form because they are expected to be the progenitors
of globular-type clusters. The maximum unstable mass is set by rotation and
depends only on the surface density and orbital frequency of the disk. We
propose that the formation of massive clusters is related to this largest scale
in galaxies not stabilized by rotation. Using data from the literature, we
predict that globular-like clusters can form in nuclear starburst disks and
protogalactic disks but not in typical spiral galaxies, in agreement with
observations.


title: A Partial Ordering on Slices of Planar Lagrangians

abstract:
  A collection of simple closed curves in $\rr^3$ is called a negative slice if
it is the intersection of a flat-at-infinity planar Lagrangian surface and
$\{y_2 = a \}$ for some $a < 0$. Examples and non-examples of negative slices
are given. Embedded Lagrange cobordisms define a relation on slices and in some
(and perhaps all) cases this relation defines a partial order. The set of
slices is a commutative monoid and the additive structure has an interesting
relationship with the ordering relation.


title: Superstrings on AdS_4 x CP^3 from Supergravity

abstract:
  We derive from a general formulation of pure spinor string theory on type IIA
backgrounds the specific form of the action for the AdS_4 x P^3 background. We
provide a complete geometrical characterization of the structure of the
superfields involved in the action.


title:
Peptide strings clues to the genesis and treatment of rheumatoid
  arthritis: rebuilding self-protective immunity amid fungal ruins

abstract:
  A recent application of the peptide strings concept has yielded novel
perceptions on cell growth regulation, for instance that of oncoprotein
metastasis. Here, this interdisciplinary approach at the boundary between
physics and biology has been applied to gain a more profound insight into
rheumatoid arthritis. As a result of the present investigation, this disease
could be viewed as due to a metabolic dysregulation/syndrome-associated
breakdown in the immunoglobulin A-based surveillance of the potentially
pathogenic fungus Candida albicans that subsequently engenders a widespread
self-destruction through cross-reactive auto-epitopes, ultimately amounting to
the systemic predominance of a pro-inflammatory peptide string. Its therapeutic
counterpart equally proposed in this report might serve as a model for future
strategies against autoimmunity.


title: Delayed X-ray emission from fallback in compact-object mergers

abstract:
  When double neutron star or neutron star-black hole binaries merge, the final
remnant may comprise a central solar-mass black hole surrounded by a 0.01-0.1
solar masses torus. The subsequent evolution of this disc may be responsible
for short gamma-ray bursts (SGRBs). A comparable amount of mass is ejected into
eccentric orbits and will eventually fall back to the merger site after
approximately 0.01 seconds. In this Paper, we investigate analytically the fate
of the fallback matter, which may provide a luminous signal long after the disc
is exhausted. We find that matter in the eccentric tail returns at a
super-Eddington rate and is eventually (0.1 sec) unable to cool via neutrino
emission and accrete all the way to the black hole. Therefore, contrary to
previous claims, our analysis suggests that fallback matter is not an efficient
source of late time accretion power and is unlikely to cause the late flaring
activity observed in SGRB afterglows. The fallback matter rather forms a
radiation-driven wind or a bound atmosphere. In both cases, the emitting plasma
is very opaque and photons are released with a degraded energy in the X-ray
band. We therefore suggest that compact binary mergers could be followed by an
"X-ray renaissance", as late as several days to weeks after the merger. This
might be observed by the next generation of X-ray detectors.


title: Adiabatic fluctuations from cosmic strings in a contracting universe

abstract:
  We show that adiabatic, super-Hubble, and almost scale invariant density
fluctuations are produced by cosmic strings in a contracting universe. An
essential point is that isocurvature perturbations produced by topological
defects such as cosmic strings on super-Hubble scales lead to a source term
which seeds the growth of curvature fluctuations on these scales. Once the
symmetry has been restored at high temperatures, the isocurvature seeds
disappear, and the fluctuations evolve as adiabatic ones in the expanding
phase. Thus, cosmic strings may be resurrected as a mechanism for generating
the primordial density fluctuations observed today.


title: Instantons and SUSY breaking in F-theory

abstract:
  We study instanton contributions to the superpotential of local F-theory
compactifications which could potentially be used to engineer models of
dynamical supersymmetry breaking. These instantons correspond to Euclidean
3-branes which form a threshold bound state with spacetime filling 7-branes. In
certain cases, their contributions to the effective 4d superpotential can be
determined in both perturbative string theory as well as directly via the
topologically twisted theory on the 3-brane worldvolume, and in all cases we
observe an exact match between these results. We further present an instanton
generated Polonyi-like model, and characterize subleading corrections to the
superpotential which arise from multi-instantons. We also study instanton
contributions to 4d pure N=1 SU(N) gauge theory realized by a stack of 7-branes
wrapping a rigid 4-cycle and find that there is a non-trivial contribution to
the glueball superpotential from the single instanton sector. This correction
is absent in the purely 4d theory and could conceivably be used either to
stabilize moduli or to break supersymmetry.


title: The electronic structure of the Na$_x$CoO$_2$ surface

abstract:
  The idea that surface effects may play an important role in suppressing
$e_g'$ Fermi surface pockets on Na$_x$CoO$_2$ $(0.333 \le x \le 0.75)$ has been
frequently proposed to explain the discrepancy between LDA calculations
(performed on the bulk compound) which find $e_g$' hole pockets present and
ARPES experiments, which do not observe the hole pockets. Since ARPES is a
surface sensitive technique it is important to investigate the effects that
surface formation will have on the electronic structure of Na$_{1/3}$CoO$_2$ in
order to more accurately compare theory and experiment. We have calculated the
band structure and Fermi surface of cleaved Na$_{1/3}$CoO$_2$ and determined
that the surface non-trivially affects the fermiology in comparison to the
bulk. Additionally, we examine the likelihood of possible hydroxyl cotamination
and surface termination. Our results show that a combination of surface
formation and contamination effects could resolve the ongoing controversy
between ARPES experiments and theory.


title:
Fragmentation Function in Non-Equilibrium QCD Using Closed-Time Path
  Integral Formalism

abstract:
  In this paper we implement Schwinger-Keldysh closed-time path integral
formalism in non-equilibrium QCD to the definition of Collins-Soper
fragmentation function. We consider a high p_T parton in QCD medium at initial
time t_0 with arbitrary non-equilibrium (non-isotropic) distribution function
f(\vec{p}) fragmenting to hadron. We formulate parton to hadron fragmentation
function in non-equilibrium QCD in the light-cone quantization formalism. It
may be possible to include final state interactions with the medium via
modification of the Wilson lines in this definition of the non-equilibrium
fragmentation function. This may be relevant to study hadron production from
quark-gluon plasma at RHIC and LHC.


title: Emergent Exoplanet Flux: Review of the Spitzer Results

abstract:
  Observations using the Spitzer Space Telescope provided the first detections
of photons from extrasolar planets. Spitzer observations are allowing us to
infer the temperature structure, composition, and dynamics of exoplanet
atmospheres. The Spitzer studies extend from many hot Jupiters, to the hot
Neptune orbiting GJ436. Here I review the current status of Spitzer secondary
eclipse observations, and summarize the results from the viewpoint of what is
robust, what needs more work, and what the observations are telling us about
the physical nature of exoplanet atmospheres.


title: The Dark Top

abstract:
  We present a class of composite Higgs models in which the particle that
regulates the top quark contribution to the Higgs potential is also a
weakly-interacting dark matter candidate. This color-neutral "dark top" is
related to the standard model top quark through a large global symmetry.
Because the same couplings that control the Higgs potential also determine
various dark matter cross sections, the dark top scenario is quite predictive
once the dark top mass and various quantum numbers are specified. We construct
two concrete examples of dark top models with plausible UV completions and
study their dark matter properties and LHC signatures.


title:
The Riesz energy of the $N$-th roots of unity: an asymptotic expansion
  for large $N$

abstract:
  We derive the complete asymptotic expansion in terms of powers of $N$ for the
Riesz $s$-energy of $N$ equally spaced points on the unit circle as $N\to
\infty$. For $s\ge -2$, such points form optimal energy $N$-point
configurations with respect to the Riesz potential $1/r^{s}$, $s\neq0$, where
$r$ is the Euclidean distance between points.
  By analytic continuation we deduce the expansion for all complex values of
$s$.
  The Riemann zeta function plays an essential role in this asymptotic
expansion.


title:
High-Resolution Spectroscopy of Long-Periodic Eclipsing Binary Epsilon
  Aurigae

abstract:
  The results of spectroscopic observations of long-periodic eclipsing binary
Epsilon Aur are reported. The observations were carried out during 2 nights in
2007 at 2-meter telescope located at the peak Terskol, Northern Caucasus
(Russia). Here we present series of Epsilon Aur spectra together with EW
measurements of the most prominent absorption lines.


title: Topological Entropy of Quantum Hall States in Rotating Bose Gases

abstract:
  Through exact numerical diagonalization, the von Neumann entropy is
calculated for the Laughlin and Pfaffian quantum Hall states in rotating
interacting Bose gases at zero temperature in the lowest Landau level limit.
The particles comprising the states are indistinguishable, so the required
spatial bipartitioning is effected by tracing over a subset of single-particle
orbitals. The topological entropy is then extracted through a finite-size
scaling analysis. The results for the Laughlin and the Pfaffian states agree
with the expected values of $\ln\sqrt{2}$ and $\ln\sqrt{4}$, respectively.


title: Landau Hydrodynamics Reexamined

abstract:
  We review the formulation of Landau hydrodynamics and find that the rapidity
distribution of produced particles in the center-of-mass system should be more
appropriately modified as dN/dy \exp[\sqrt{y_b^2-y^2}], where
y_b=\ln[\sqrt{s_{NN}}/m_p] is the beam nucleon rapidity, instead of Landau's
original distribution, dN/dy(Landau) \exp[\sqrt{L^2-y^2}], where
L=\ln[\sqrt{s_{NN}}/2m_p]. The modified distribution agrees better with
experimental dN/dy data than the original Landau distribution and can be
represented well by the Gaussian distribution, dN/dy(Gaussian) \exp[-y^2/2L].
Past successes of the Gaussian distribution in explaining experimental rapidity
data can be understood, not because it is an approximation of the original
Landau distribution, but because it is in fact a close representation of the
modified distribution. Predictions for pp and AA collisions at LHC energies in
Landau hydrodynamics are presented.


title: Trapping of Nonlinear Gravitational Waves by Two-Fluid Systems

abstract:
  We show that the coupled two-fluid gravitating system (e.g. stiff matter and
'vacuum energy') could trap nonlinear gravitational waves (e.g. Einstein-Rosen
waves). The gravitational wave amplitude varies harmonically in time
transferring the energy coherently to the stiff matter wave, and then the
process goes to the backward direction. This process mimics the behaviour of
trapped electromagnetic waves in two-level media. We have defined the limits
for the frequency of this energy transfer oscillations.


title:
Measurement of differential Z/gamma*+jet+X cross sections in proton
  anti-proton collisions at sqrt{s}=1.96 TeV

abstract:
  We present new measurements of differential cross sections for
Z/gamma*(->mumu)+jet+X production in a 1 fb-1 data sample collected with the D0
detector in proton anti-proton collisions at sqrt{s}=1.96 TeV. Results include
the first measurements differential in the Z/gamma* transverse momentum and
rapidity, as well as new measurements differential in the leading jet
transverse momentum and rapidity. Next-to-leading order perturbative QCD
predictions are compared to the measurements, and reasonable agreement is
observed, except in the region of low Z/gamma* transverse momentum. Predictions
from two event generators based on matrix elements and parton showers, and one
pure parton shower event generator are also compared to the measurements. These
show significant overall normalization differences to the data and have varied
success in describing the shape of the distributions.


title: Averages of b-hadron and c-hadron Properties at the End of 2007

abstract:
  This article reports world averages for measurements of b-hadron and c-hadron
properties obtained by the Heavy Flavor Averaging Group (HFAG) using the
results available at the end of 2007. For the averaging, common input
parameters used in the various analyses are adjusted (rescaled) to common
values, and known correlations are taken into account. The averages include
branching fractions, lifetimes, neutral meson mixing parameters, CP violation
parameters, and parameters of semileptonic decays.


title: Quantum metric spaces of quantum maps

abstract:
  We show that any quantum family of maps from a non commutative space to a
compact quantum metric space has a canonical quantum semi metric structure.


title:
Optimal control of a stochastic network driven by a fractional Brownian
  motion input

abstract:
  We consider a stochastic control model driven by a fractional Brownian
motion. This model is a formal approximation to a queueing network with an
on-off input process. We study stochastic control problems associated with the
long-run average cost, the infinite horizon discounted cost, and the finite
horizon cost. In addition, we find a solution to a constrained minimization
problem as an application of our solution to the long-run average cost problem.
We also establish Abelian limit relationships among the value functions of the
above control problems.


title:
Linearized model Fokker-Planck collision operators for gyrokinetic
  simulations. I. Theory

abstract:
  A new analytically and numerically manageable model collision operator is
developed specifically for turbulence simulations. The like-particle collision
operator includes both pitch-angle scattering and energy diffusion and
satisfies the physical constraints required for collision operators: it
conserves particles, momentum and energy, obeys Boltzmann's H-theorem
(collisions cannot decrease entropy), vanishes on a Maxwellian, and efficiently
dissipates small-scale structure in the velocity space. The process of
transforming this collision operator into the gyroaveraged form for use in
gyrokinetic simulations is detailed. The gyroaveraged model operator is shown
to have more suitable behavior at small scales in phase space than previously
suggested models. A model operator for electron-ion collisions is also
presented.


title:
The Future Evolution of White Dwarf Stars Through Baryon Decay and Time
  Varying Gravitational Constant

abstract:
  Motivated by the possibility that the fundamental ``constants'' of nature
could vary with time, this paper considers the long term evolution of white
dwarf stars under the combined action of proton decay and variations in the
gravitational constant. White dwarfs are thus used as a theoretical laboratory
to study the effects of possible time variations, especially their implications
for the future history of the universe. More specifically, we consider the
gravitational constant $G$ to vary according to the parametric relation $G =
G_0 (1 + t/t_\ast)^{-p}$, where the time scale $t_\ast$ is the same order as
the proton lifetime. We then study the long term fate and evolution of white
dwarf stars. This treatment begins when proton decay dominates the stellar
luminosity, and ends when the star becomes optically thin to its internal
radiation.


title:
Testing the Dark-Energy-Dominated Cosmology by the Solar-System
  Experiments

abstract:
  According to the recent astronomical data, the most part of energy in the
Universe is in the 'dark' form, which is effectively described by Lambda-term
in Einstein equations. All arguments in favor of the dark energy were obtained
so far from the observational data related to very large (intergalactic)
scales. Is it possible to find a manifestation of the dark energy at much less
scales (e.g. inside the Solar system)?


title: The Density Matrix Renormalization Group and the Nuclear Shell Model

abstract:
  We summarize recent efforts to develop an angular-momentum-conserving variant
of the Density Matrix Renormalization Group method into a practical truncation
strategy for large-scale shell model calculations of atomic nuclei. Following a
brief description of the key elements of the method, we report the results of
test calculations for $^{48}$Cr and $^{56}$Ni. In both cases we consider
nucleons limited to the 2p-1f shell and interacting via the KB3 interaction.
Both calculations produce a high level of agreement with the exact shell-model
results. Furthermore, and most importantly, the fraction of the complete space
required to achieve this high level of agreement goes down rapidly as the size
of the full space grows.


title: Stability of the fermionic gases close to a p-wave Feshbach resonance

abstract:
  We study the stability of the paired fermionic p-wave superfluid made out of
identical atoms all in the same hyperfine state close to a p-wave Feshbach
resonance. First we reproduce known results concerning the lifetime of a 3D
superfluid, in particular, we show that it decays at the same rate as its
interaction energy, thus precluding its equilibration before it decays. Then we
proceed to study its stability in case when the superfluid is confined to 2D by
means of an optical harmonic potential. We find that the relative stability is
somewhat improved in 2D in the BCS regime, such that the decay rate is now
slower than the appropriate interaction energy scale. The improvement in
stability, however, is not dramatic and one probably needs to look for other
mechanisms to suppress decay to create a long lived 2D p-wave fermionic
superfluid.


title:
X-ray Spectral Identification of Three Candidate Quiescent Low-Mass
  X-ray Binaries in the Globular Cluster NGC 6304

abstract:
  We report the search for low-mass X-ray binaries in quiescence (qLMXBs) in
the globular cluster NGC 6304 using XMM observations. We present the spectral
analysis leading to the identification of three candidate qLMXBs within the
field of this globular cluster (GC), each consistent with the X-ray spectral
properties of previously identified qLMXBs in the field and in other globular
clusters -- specifically, with a hydrogen atmosphere neutron star with radius
between 5--20\km. One (source 4, with R=11.7^{+8.3}_{-0.4} (D/5.97 kpc) km and
kT_eff=117^{+59}_{-44} eV) is located within one core radius (r_c) of the
centre of NGC 6304. This candidate also presents a spectral power-law component
contributing 49 per cent of the 0.5-10 keV flux. A second one (source 9 with
R=15.3^{+11.2}_{-6.5} (D/5.97 kpc) km and kT_eff=100^{+24}_{-19} eV) is found
well outside the optical core (at 32 r_c) but still within the tidal radius.
  From spatial coincidence, we identify a bright 2MASS infrared counterpart
which, at the distance of NGC 6304, seems to be a post-asymptotic giant branch
star. The third qLMXB (source 5 with R=23^{+38}_{-14} (D/5.97 kpc) km and
kT_eff=70^{+28}_{-20} eV) is a low signal-to-noise candidate for which we also
identify from spatial coincidence a bright 2MASS infrared counterpart, with
99.916 per cent confidence. Three qLMXBs from this GC is marginally consistent
with that expected from the encounter rate of NGC 6304. We also report a low
signal-to-noise source with an unusually hard photon index
(\alpha=-2.0^{+1.2}_{-2.2}). Finally, we present an updated catalogue of the
X-ray sources lying in the field of NGC 6304, and compare this with the
previous catalogue compiled from ROSAT observations.


title:
Measurement of sigma(ppbar -> Z + X) Br(Z -> tau+tau-) at sqrt(s)=1.96
  TeV

abstract:
  We present a measurement of the cross section for Z boson production times
the branching fraction to tau lepton pairs sigma(ppbar -> Z + X) Br(Z -> tau+
tau-) in proton-antiproton collisions at center of mass energy 1.96 TeV. The
measurement is performed in the channel in which one tau lepton decays into a
muon and neutrinos, and the other tau lepton decays hadronically or into an
electron and neutrinos. The data sample corresponds to an integrated luminosity
of 1.0 inverse fb collected with the D0 detector at the Fermilab Tevatron
Collider. The sample contains 1511 candidate events with an estimated 20%
background from jets or muons misidentified as tau leptons. We obtain sigma Br
= 240 +/- 8 (stat) +/- 12 (sys) +/- 15 (lum) pb, which is consistent with the
standard model prediction.


title:
Stability of multi-dimensional viscous shocks for symmetric systems with
  variable multiplicities

abstract:
  We establish long-time stability of multi-dimensional viscous shocks of a
general class of symmetric hyperbolic--parabolic systems with variable
multiplicities, notably including the equations of compressible
magnetohydrodynamics (MHD) in dimensions $d\ge 2$. This extends the existing
result established by K. Zumbrun for systems with characteristics of constant
multiplicity to the ones with variable multiplicity, yielding the first such a
stability result for (fast) MHD shocks. At the same time, we are able to drop a
technical assumption on structure of the so--called glancing set that was
necessarily used in previous analyses. The key idea to the improvements is to
introduce a new simple argument for obtaining a $L^1\to L^p$ resolvent bound in
low--frequency regimes by employing the recent construction of degenerate
Kreiss' symmetrizers by O. Gu\`es, G. M\'etivier, M. Williams, and K. Zumbrun.
Thus, at the low-frequency resolvent bound level, our analysis gives an
alternative to the earlier pointwise Green's function approach of K. Zumbrun.
High--frequency solution operator bounds have been previously established
entirely by nonlinear energy estimates.


title:
Local structural origins of the distinct electronic properties of
  Nb-substituted SrTiO$_3$ and BaTi$O_3$

abstract:
  Near or less than 10% Nb substitution on the Ti site in perovskite SrTiO$_3$
results in metallic behavior, in contrast to what is seen in BaTiO$_3$. Given
the nearly identical structure and electron counts of the two materials, the
distinct ground states for low substitution have been a long-standing puzzle.
Here we find from neutron studies of average and local structure, the subtle
yet critical difference that we believe underpins the distinct electronic
properties in these fascinating materials. While
SrTi$_{0.875}$Nb_${0.125}$O$_3$ possesses a distorted non-cubic structure at 15
K, the BO$_6$ octahedra in the structure are regular.
BaTi$_{0.875}$Nb$_{0.125}$O$_3$ on the other hand shows evidence for local
cation off-centering whilst retaining a cubic structure.


title: Universal Cycles of Restricted Classes of Words

abstract:
  It is well known that Universal Cycles of $k$-letter words on an $n$-letter
alphabet exist for all $k$ and $n$. In this paper, we prove that Universal
Cycles exist for restricted classes of words, including: non-bijections,
equitable words (under suitable restrictions), ranked permutations, and
"passwords".


title:
Influence of Disorder on Electron-Hole Pair Condensation in Graphene
  Bilayers

abstract:
  Graphene bilayers can condense into a state with spontaneous interlayer phase
coherence that supports dissipationless counterflow supercurrents. Here we
address the influence of disorder on the graphene bilayer mean-field and
Kosterlitz-Thouless critical temperatures and report on a simple criteria for
the survival of pair condensation.


title: Periodic resolutions and self-injective algebras of finite type

abstract:
  We say that an algebra A is periodic if it has a periodic projective
resolution as an (A,A)-bimodule. We show that any self-injective algebra of
finite representation type is periodic. To prove this, we first apply the
theory of smash products to show that for a finite Galois covering B --> A, B
is periodic if and only if A is. In addition, when A has finite representation
type, we build upon results of Buchweitz to show that periodicity passes
between A and its stable Auslander algebra. Finally, we use Asashiba's
classification of the derived equivalence classes of self-injective algebras of
finite type to compute bounds for the periods of these algebras, and give an
application to stable Calabi-Yau dimensions.


title: Understanding adsorption of hydrogen atoms on graphene

abstract:
  Adsorption of hydrogen atoms on a single graphite sheet (graphene) has been
investigated by first-principles electronic structure means, employing
plane-wave based, periodic density functional theory. A reasonably large 5x5
surface unit cell has been employed to study single and multiple adsorption of
H atoms. Binding and barrier energies for sequential sticking have been
computed for a number of configurations involving adsorption on top of carbon
atoms. We find that binding energies per atom range from ~0.8 eV to ~1.9 eV,
with barriers to sticking in the range 0.0-0.2 eV. In addition, depending on
the number and location of adsorbed hydrogen atoms, we find that magnetic
structures may form in which spin density localizes on a
$\sqrt{3}{x}\sqrt{3}{R}30^{\circ}$ sublattice, and that binding (barrier)
energies for sequential adsorption increase (decrease) linearly with the
site-integrated magnetization. These results can be rationalized with the help
of the valence-bond resonance theory of planar $\pi$ conjugated systems, and
suggest that preferential sticking due to barrierless adsorption is limited to
formation of hydrogen pairs.


title: Directed Transport in classical and quantum chaotic billiards

abstract:
  We construct an autonomous chaotic Hamiltonian ratchet as a channel billiard
subdivided by equidistant walls attached perpendicularly to one side of the
channel, leaving an opening on the opposite side. A static homogeneous magnetic
field penetrating the billiard breaks time-reversal invariance and renders the
classical motion partially chaotic. We show that the classical dynamics
exhibits directed transport, owing to the asymmetric distribution of regular
regions in phase space. The billiard is quantized by a numerical method based
on a finite-element algorithm combined with the Landau gauge and the Bloch
formalism for periodic potentials. We discuss features of the billiard
eigenstates such as node lines and vortices in the probability flow. Evidence
for directed quantum transport, inherited from the corresponding features of
the classical dynamics, is presented in terms of level-velocity statistics.


title:
Superfluid density near the critical temperature in the presence of
  random planar defects

abstract:
  The superfluid density near the superconducting transition is investigated in
the presence of spatial inhomogeneity in the critical temperature. Disorder is
accounted for by means of a random $T_c$ term in the conventional
Ginzburg-Landau action for the superconducting order parameter. Focusing on the
case where a low-density of randomly distributed planar defects are responsible
for the variation of $T_c$, we derive the lowest order correction to the
superfluid density in powers of the defect concentration. The correction is
calculated assuming a broad Gaussian distribution for the strengths of the
defect potentials. Our results are in a qualitative agreement with the
superfluid density measurements in the underdoped regime of high-quality YBCO
crystals by Broun and co-workers.


title: AMBER Task Force February 2008 run report

abstract:
  AMBER was installed in March 2004 in the VLTI focal lab of the VLT
observatory in Cerro Paranal run by ESO. Since then, there have been 4
commissioning runs and additional VLTI infrastructure installed (IRIS, FINITO
and ATs,...), but AMBER is not yet fulfilling all its initial specifications
and some important primary science objectives cannot be achieved. At the
consortium level, an action plan has been decided in Oct 2007 that created an
AMBER Task Force (ATF) to understand and possibly cure the eventual technical
issues. The objectives of the February 2008 run was mainly to bring AMBER into
contractual specifications the accuracy of the absolute visibility, of the
differential and of the closure phase through a fundamental analysis of the
instrument status and limitations. This report is the official report of the
AMBER Task Force.


title: Growth factor parametrization and modified gravity

abstract:
  The growth rate of matter perturbation and the expansion rate of the Universe
can be used to distinguish modified gravity and dark energy models in
explaining the cosmic acceleration. The growth rate is parametrized by the
growth index $\gamma$. We discuss the dependence of $\gamma$ on the matter
energy density $\Omega$ and its current value $\Omega_0$ for a more accurate
approximation of the growth factor. The observational data, including the data
of the growth rate, are used to fit different models. The data strongly
disfavor the Dvali-Gabadadze-Porrati model. For the dark energy model with a
constant equation of state, we find that $\Omega_0=0.27\pm 0.02$ and
$w=-0.97\pm 0.09$. For the $\Lambda$CDM model, we find that
$\gamma=0.64^{+0.17}_{-0.15}$. For the Dvali-Gabadadze-Porrati model, we find
that $\gamma=0.55^{+0.14}_{-0.13}$.


title:
Neutrino/antineutrino-$^{12}$C charged cross sections in the projected
  QRPA formalism

abstract:
  The $\nu/\bar{\nu}-^{12}$C cross sections are evaluated in the projected
quasiparticle random phase approximation (PQRPA). The cross section for $\nu_e$
as a function of the incident neutrino energy is compared with recent
theoretical calculations of more sophisticated models. The $\bar{\nu}-^{12}$C
cross section is calculated for the first time with the PQRPA. The distribution
of cross sections averaged with the Michel spectrum as well as with other
estimated fluxes for future experiments is compared for both $\nu_e$ and
$\bar{\nu}_e$. Some astrophysical implications are addressed.


title:
The rationality of the moduli space of genus four curves endowed with an
  order three subgroup of their Jacobian

abstract:
  Refereed version to appear in Michigan Mathematical Journal. A mistake in the
last section of the previous version has been corrected. The new title exactly
describes the main result obtained. Building on the geometry of cubic surfaces
and on a theorem of Dolgachev, the rationality of the moduli space R mentioned
in the title is proved. Let M be the moduli space of 6 points in the plane,
modulo the natural involution induced by double-six configurations on cubic
surfaces. It is proved that R is birational to a tower of locally trivial
projective bundles ending onto M. The rationality of R then follows from
Dolgachev's theorem that M is rational.


title:
Cohomology algebra of the orbit space of some free actions on spaces of
  cohomology type (a, b)

abstract:
  Let X be a finitistic space with non-trivial cohomology groups H^in(X;Z)=Z
with generators v_i, where i = 0, 1, 2, 3. We say that X has cohomology type
(a, b) if v_1^2 = av_2 and v_1v_2 = bv_3 . In this note, we determine the mod 2
cohomology ring of the orbit space X/G of a free action of G = Z_2 on X, where
both a and b are even. In this case, we observed that there is no equivariant
map S^m --> X for m > 3n, where S^m has the antipodal action. Moreover, it is
shown that G can not act freely on space X which is of cohomology type (a, b)
where a is odd and b is even. We also obtain the mod 2 cohomology ring of the
orbit space X/G of free action of G = S^1 on the space X of type (0, b).


title: Presentations of Semigroup Algebras of Weighted Trees

abstract:
  We find presentations for subalgebras of invariants of the coordinate
algebras of binary symmetric models of phylogenetic trees studied by Buczynska
and Wisniewski in \cite{BW}. These algebras arise as toric degenerations of
rings of global sections of weight varieties of the Grassmanian of two planes
associated to the Pl\"ucker embedding, and as toric degenerations of rings of
invariants of Cox-Nagata rings.


title: Caught in formation: the nuclear-cluster-to-be in NGC 2139

abstract:
  Close to its center, the bulgeless galaxy NGC 2139 hosts a star cluster that
is younger and less massive than any actual nuclear star cluster (NC) studied
so far. We have measured the H-alpha velocity field around the photometric
center of this galaxy using the VLT ARGUS integral field unit and GIRAFFE
spectrograph in order to constrain different proposed theories of NC formation.
We observe that the best-fit kinematic center and the candidate NC appear to be
separated by 2.8 arcsec (320 pc). Indeed, the kinematic center also is offset
from the galaxy's photometric center and a possible bar or extended region of
star formation in which the young cluster resides, implying that this galaxy is
not in dynamic equilibrium. The H-alpha flux map also reveals other regions of
strong star formation in the possible bar. These observations suggest that a
nascent NC is forming away from the kinematic center of NGC 2139 which may come
to rest there on a time scale of a few 100 Myr.


title: Coulomb Drag in the Exciton Regime in Electron-Hole Bilayers

abstract:
  We report electrical transport measurements on GaAs/AlGaAs based
electron-hole bilayers. These systems are expected to make a transition from a
pair of weakly coupled two-dimensional systems to a strongly coupled exciton
system as the barrier between the layers is reduced. Once excitons form,
phenomena such as Bose-Einstein condensation of excitons could be observed. In
our devices, electrons and holes are confined in double quantum wells, and
carriers in the devices are induced with top and bottom gates leading to
variable density in each layer. Separate contact to each layer allows Coulomb
drag transport measurements where current is driven in one layer while voltage
is measured in the other. Coulomb drag is sensitive to interlayer coupling and
has been predicted to provide a strong signature of exciton condensation. Drag
measurement on EHBLs with a 30 nm barrier are consistent with drag between two
weakly coupled 2D Fermi systems where the drag decreases as the temperature is
reduced. When the barrier is reduced to 20 nm, we observe a consistent increase
in the drag resistance as the temperature is reduced. These results indicate
the onset of a much stronger coupling between the electrons and holes which
leads to exciton formation and possibly phenomena related to exciton
condensation.


title: An Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates

abstract:
  Angle-resolved photoemission spectroscopy with low-energy tunable photons
along the nodal direction of oxygen isotope substituted Bi2Sr2CaCu2O8+delta
reveals a distinct oxygen isotope shift near the electron-boson coupling "kink"
in the electronic dispersion. The magnitude (a few meV) and direction of the
kink shift are as expected due to the measured isotopic shift of phonon
frequency, which are also in agreement with theoretical expectations. This
demonstrates the participation of the phonons as dominant players, as well as
pinpointing the most relevant of the phonon branches.


title: Nanoconcentration of Terahertz Radiation in Plasmonic Waveguides

abstract:
  Recent years have seen an explosive research and development of
nanoplasmonics in the visible and near-infrared (near-ir) frequency regions.
One of the most fundamental effects in nanoplasmonics is nano-concentration of
optical energy. Plasmonic nanofocusing has been predicted and experimentally
achieved. It will be very beneficial for the fundamental science, engineering,
environmental, and defense applications to be able to nano-concentrate
terahertz radiation (frequency 1 - 10 THz or vacuum wavelength 300 - 30
microns). This will allow for the nanoscale spatial resolution for THz imaging
and introduce the THz spectroscopy on the nanoscale, taking full advantage of
the rich THz spectra and submicron to nanoscale structures of many engineering,
physical, and biological objects of wide interest: electronic components
(integrated circuits, etc.), bacteria, their spores, viruses, macromolecules,
carbon clusters and nanotubes, etc. In this Letter we establish the principal
limits for the nanoconcentration of the THz radiation in metal/dielectric
waveguides and determine their optimum shapes required for this
nanoconcentration We predict that the adiabatic compression of THz radiation
from the initial spot size of light wavelength to the final size of R = 100 -
250 nm can be achieved with the THz radiation intensity increased by a factor
of 10 to 250. This THz energy nanoconcentration will not only improve the
spatial resolution and increase the signal/noise ratio for the THz imaging and
spectroscopy, but in combination with the recently developed sources of
powerful THz pulses will allow the observation of nonlinear THz effects and a
carrying out a variety of nonlinear spectroscopies (such as two-dimensional
spectroscopy), which are highly informative.


title:
Search for Anomalous Production of Photon, b-jet, and Missing Transverse
  Energy at CDF

abstract:
  We report the results of two signature-based searches for new physics using
1.9- 2.0 fb-1 of data collected at the CDF experiment. Both analyses look in
events containing a photon, a b-tagged jet, and missing transverse energy. The
first search requires an additional jet. The second search requires an extra
electron or muon. No significant excess of events over the Standard Model
prediction is observed. We also describe the "CES/CPR" method which is used to
estimate the amount of mis-identified photons.


title: Orbital-Selective Mott transition out of band degeneracy lifting

abstract:
  We outline a general mechanism for Orbital-selective Mott transition (OSMT),
the coexistence of both itinerant and localized conduction electrons, and show
how it can take place in a wide range of realistic situations, even for bands
of identical width and correlation, provided a crystal field splits the energy
levels in manifolds with different degeneracies and the exchange coupling is
large enough to reduce orbital fluctuations. The mechanism relies on the
different kinetic energy in manifolds with different degeneracy. This phase has
Curie-Weiss susceptibility and non Fermi-liquid behavior, which disappear at a
critical doping, all of which is reminiscent of the physics of the pnictides.


title: Addendum to: "Knots, sutures and excision"

abstract:
  We observe that the main theorem in \cite{KMsuture} immediately implies its
analogue for closed 3--manifolds.


title: Disorder effect on 3-dimensional $Z_2$ quantum spin Hall systems

abstract:
  In this paper, we studied the nonmagnetic disorder effects onto the quantum
critical point (QCP) which intervenes an ordinary insulator and the
3-dimensional $Z_2$ quantum spin Hall insulator. The minimal model describing
this QCP is the single-copy of the 3+1 Dirac fermion, whose topological mass
$m$ induces the quantum phase transition. We derived the phase diagram spanned
by this mass-term $m$, chemical potential $\mu$ and strength of the disorder
within the self-consistent Born approximation. To infer the structure of the
low-energy effective theory, we further calculated the weak localization (WL)
correction to the conductivity. By way of this, we have found that the diffuson
consists of the two quasi-degenerate contributions having the diffusion pole;
one always behaves as the diffusion mode. The other becomes the massless mode
only at $m=0$. Based on this "two-mode picture", we will discuss the possible
microscopic picture of the "levitation and pair annihilation" phenomena,
recently discovered by Onoda et al.


title: Schubert polynomials and Arakelov theory of symplectic flag varieties

abstract:
  Let X be the flag variety of the symplectic group. We propose a theory of
combinatorially explicit Schubert polynomials which represent the Schubert
classes in the Borel presentation of the cohomology ring of X. We use these
polynomials to describe the arithmetic Schubert calculus on X. Moreover, we
give a method to compute the natural arithmetic Chern numbers on X, and show
that they are all rational numbers.


title: Dissipative Structures in Supersonic Turbulence

abstract:
  We show that density-weighted moments of the dissipation rate, $\epsilon_l$,
averaged over a scale $l$, in supersonic turbulence can be successfully
explained by the She and L\'ev\^eque model [Phys. Rev. Lett. {\bf 72}, 336
(1994)]. A general method is developed to measure the two parameters of the
model, $\gamma$ and $d$, based directly on their physical interpretations as
the scaling exponent of the dissipation rate in the most intermittent
structures ($\gamma$) and the dimension of the structures ($d$). We find that
the best-fit parameters ($\gamma=0.71$ and $d=1.90$) derived from the
$\epsilon_l$ scalings in a simulation of supersonic turbulence at Mach 6 agree
with their direct measurements, confirming the validity of the model in
supersonic turbulence.


title: Semistar dimension of polynomial rings and Pr\"{u}fer-like domains

abstract:
  Let $D$ be an integral domain and $\star$ a semistar operation stable and of
finite type on it. In this paper we define the semistar dimension (inequality)
formula and discover their relations with $\star$-universally catenarian
domains and $\star$-stably strong S-domains. As an application we give new
characterizations of $\star$-quasi-Pr\"{u}fer domains and UM$t$ domains in
terms of dimension inequality formula (and the notions of universally
catenarian domain, stably strong S-domain, strong S-domain, and Jaffard
domains). We also extend Arnold's formula to the setting of semistar
operations.


title: Electronic transport and specific heat of 1T- VSe2

abstract:
  The results of low temperature thermoelectric power and the specific heat of
1T-VSe2 (Vanadium diselenide) have been reported along with the electrical
resistivity, and Hall coefficient of the compound. The Charge Density Wave
(CDW) transition is observed near 110K temperature in all these properties. The
Thermoelectric power has been measured from 15K to 300K spanning the
incommensurate and commensurate CDW regions. We observed a weak anomaly at the
CDW transition for the first time in the specific heat of VSe2. The linear
temperature dependence of resistivity and thermoelectric power at higher
temperatures suggests a normal metallic behavior and electron-phonon scattering
above the CDW transition. The positive thermoelectric power and negative Hall
coefficient along with strongly temperature dependent behavior in the CDW phase
suggest a mixed conduction related to the strongly hybridized s-p-d bands in
this compound.


title: Transport and Magnetic Properties of FexVse2 (x = 0 - 0.33)

abstract:
  We present our results of the effect of Fe intercalation on the structural,
transport and magnetic properties of 1T-VSe2. Intercalation of iron, suppresses
the 110K charge density wave (CDW) transition of the 1T-VSe2. For the higher
concentration of iron, formation of a new kind of first order transition at
160K takes place, which go on stronger for the 33% Fe intercalation.
Thermopower of the FexVSe2 compounds (x = 0 - 0.33), however do not show any
anomaly around the transition. The intercalation of Fe does not trigger any
magnetism in the weak paramagnetic 1T-VSe2, and Fe is the low spin state of
Fe3+.


title: Transport and Magnetic properties of Fe1/3VSe2

abstract:
  Electrical conductivity, thermopower and magnetic properties of
Fe-intercalated Fe0.33VSe2 has been reported between 4.2K - 300K. We observe a
first order transition in the resistivity of the sintered pellets around 160K
on cooling. The electronic properties including the transitional hysteresis in
the resistance anomaly (from 80K-160K) are found to be very sensitive to the
structural details of the samples, which were prepared in different annealing
conditions. The thermopower results on the sintered pellets are reported
between 10K - 300K. The magnetic measurements between 2K - 300K and up to 14
Tesla field show the absence of any magnetic ordering in Fe0.33VSe2. The
magnetic moment per Fe -atom at room temperature (between 1.4 to 1.7 Bohr
Magneton) is much lower than in previously reported anti-ferromagnetic FeV2Se4.
Furthermore, the Curie constant shows a rapid and continuous reduction and
combined with the high field magnetization result at 2K suggests a rapid
decrease in the paramagnetic moments on cooling to low temperatures and the
absence of any magnetic order in Fe0.33VSe2 at low temperatures.


title:
$f(R)$ gravity constrained by PPN parameters and stochastic background
  of gravitational waves

abstract:
  We analyze seven different viable $f(R)$-gravities towards the Solar System
tests and stochastic gravitational waves background. The aim is to achieve
experimental bounds for the theory at local and cosmological scales in order to
select models capable of addressing the accelerating cosmological expansion
without cosmological constant but evading the weak field constraints. Beside
large scale structure and galactic dynamics, these bounds can be considered
complimentary in order to select self-consistent theories of gravity working at
the infrared limit. It is demonstrated that seven viable $f(R)$-gravities under
consideration not only satisfy the local tests, but additionally, pass the
above PPN-and stochastic gravitational waves bounds for large classes of
parameters.


title: Theoretical Review on CP Violation in Rare B decays

abstract:
  We discuss several issues related to direct CP violation in rare $B$ meson
decays. We review the use of CP asymmetries in extracting information of strong
and weak phases, how the experimental data fit into the overall picture, and
the current status of the $K \pi$ puzzle. We also examine the flavor symmetry
assumption using closely related decay modes and extract the weak phase
$\gamma$ from certain $B \to K^* \pi$ and $\rho K$ decays.


title:
Clustering Properties of Low-Luminosity Star-Forming galaxies at z =
  0.24 and 0.40 in the Subaru Deep Field

abstract:
  We present our analysis on the clustering properties of star-forming galaxies
selected by narrow-band excesses in the Subaru Deep Field. Specifically we
focus on Halpha emitting galaxies at z = 0.24 and z = 0.40 in the same field,
to investigate possible evolutionary signatures of clustering properties of
star-forming galaxies. Based on the analysis on 228 Halpha emitting galaxies
with 39.8 < log L(Halpha) < 40.8 at z = 0.40, we find that their two-point
correlation function is estimated as xi = (r/1.62^{+0.64}_{-0.50} Mpc)^{-1.84
+/- 0.08}. This is similar to that of Halpha emitting galaxies in the same
Halpha luminosity range at z = 0.24, xi = (r/1.88^{+0.60}_{-0.49} Mpc)^{-1.89
+/- 0.07}. These correlation lengths are smaller than those for the brighter
galaxy sample studied by Meneux et al. (2006) in the same redshift range. The
evolution of correlation length between z = 0.24 and z = 0.40 is interpreted by
the gravitational growth of the dark matter halos.


title: Search for B --> K* nu anti-nu decays

abstract:
  We present a search for the decays $B \to K^{*} \nu \bar{\nu}$ using
454$\times10^{6}$ $B \bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance
with the $mbox{\slshape B\kern-0.1em{\smaller A}\kern-0.1em
B\kern-0.1em{\smaller A\kern-0.2em R}}$ detector at the SLAC PEP-II
$B$-Factory. We first select an event sample where one $B$ is reconstructed in
a semileptonic or hadronic mode with one charmed meson. The remaining particles
in the event are then examined to search for a $B \to K^{*} \nu \bar{\nu}$
decay. The charged $K^{*}$ is reconstructed as $ K^{*+} \to
K^0_{\scriptscriptstyle S} \pi^{+}$ or $ K^{*+} \to K^{+} \pi^{0}$; the neutral
$K^{*}$ is identified in the $K^{*0} \to K^{+} \pi^{-}$ mode. We establish
upper limits at 90% confidence level of $\matchal{B}(B^{+} \to K^{*+} \nu
\bar{\nu}) < 8 \times 10^{-5}$, $\matchal{B}(B^{0} \to K^{*0} \nu \bar{\nu}) <
12 \times 10^{-5}$, and $\matchal{B}(B \to K^{*} \nu \bar{\nu}) < 8 \times
10^{-5}$.


title:
The Archaic Universe: Big Bang, Cosmological Term and the Quantum Origin
  of Time in Projective Cosmology

abstract:
  This article proposes some cosmological reflections at the qualitative and
conjectural level, suggested by the Fantappie & Arcidiacono projective
relativity theory. The difference will firstly be discussed between two types
of singularity in this theory: geometric (de Sitter horizon) and physical (big
bang, big crunch). The reasons for the existence of geometric singularities are
deeply rooted in the principle of inertia and in the principle of relativity,
while physical singularities are associated with the creation or destruction of
matter. In this framework, quantum mechanics is introduced through a particular
interpretation of Bohm holomovement. Finally, a possible mechanism is discussed
for the genesis of the cosmological term. No form of inflation appears in the
scenario described.


title: Massive Boson-Fermion Degeneracy and the Early Structure of the Universe

abstract:
  The existence of a new kind of massive boson-fermion symmetry is shown
explicitly in the framework of the heterotic, type II and type II orientifold
superstring theories. The target space-time is two-dimensional. Higher
dimensional models are defined via large marginal deformations of JxJ-type. The
spectrum of the initial undeformed two dimensional vacuum consists of massless
boson degrees of freedom, while all massive boson and fermion degrees of
freedom exhibit a new Massive Spectrum Degeneracy Symmetry (MSDS). This precise
property, distinguishes the MSDS theories from the well known supersymmetric
SUSY-theories. Some proposals are stated in the framework of these theories
concerning the structure of: (i) The Early Non-singular Phase of the Universe,
(ii) The two dimensional boundary theory of AdS3 Black-Holes, (iii) Plausible
applications of the MSDS theories in particle physics, alternative to SUSY.


title:
A red supergiant nebula at 25 micron: arcsecond scale mass-loss
  asymmetries of mu Cep

abstract:
  We present diffraction limited (0.6") 24.5micron Subaru/COMICS images of the
red supergiant mu Cep. We report the detection of a circumstellar nebula, that
was not detected at shorter wavelengths. It extends to a radius of at least 6"
in the thermal infrared. On these angular scales, the nebula is roughly
spherical, in contrast, it displays a pronounced asymmetric morphology closer
in. We simultaneously model the azimuthally averaged intensity profile of the
nebula and the observed spectral energy distribution using spherical dust
radiative transfer models. The models indicate a constant mass-loss process
over the past 1000 years, for mass-loss rates a few times 10^(-7) Msun/yr. This
work supports the idea that at least part of the asymmetries in shells of
evolved massive stars and supernovae may be due to the mass-loss process in the
red supergiant phase.


title:
Confinement Induced Quantum Phase Transition and Polarization Cooling in
  a Dipolar Crystal of Polar Molecules

abstract:
  It is well-known that the liquid properties in a strongly confined system can
be very different from their ordinary behaviors in an extended system, due to
the competition between the thermal energy and the interaction energy. Here we
show that, in a low-dimensional self-assembled dipolar crystal, the parabolic
optical confinement potential can also strongly affect the quantum many-body
properties in the low temperature regime. For example, by changing the
confinement aspect ratio, the bulk of the system can undergo a quantum phase
transition between a liquid state and a solid state via a nonmonotonic pattern
formation of the domain wall. Furthermore, the entropy of a trapped dipolar
crystal can be much larger than the liquid state in the weak dipole limit,
indicating an intrinsic polarization cooling mechanism via increasing the
external field. These highly correlated confinement effects are very important
to the experimental preparation of a self-assembled dipolar crystal using
ultracold polar molecules.


title: Policy and Legal Challenges of Virtual Worlds and Social Network Sites

abstract:
  This paper addresses policy challenges of complex virtual environments such
as virtual worlds, social network sites, and massive multiplayer online games.
The complexity of these environments--apparent by the rich user interactions
and sophisticated user-generated content that they offer--poses unique
challenges for policy management and compliance. These challenges are also
impacting the life cycle of the software system that implements the virtual
environment. The goal of this paper is to identify and sketch important legal
and policy challenges of virtual environments and how they affect stakeholders
(i.e., operators, users, and lawmakers). Given the increasing significance of
virtual environments, we expect that tackling these challenges will become
increasingly important in the future.


title: On Time. 6b: Quantum Mechanical Time

abstract:
  The existence of small amounts of advanced radiation, or a tilt in the arrow
of time, makes the basic equations of physics mixed-type functional
differential equations. The novel features of such equations point to a
microphysical structure of time. This corresponds to a change of logic at the
microphysical level. We show that the resulting logic is a quantum logic. This
provides a natural and rigorous explanation of quantum interference. This
structured-time interpretation of quantum mechanics is briefly compared with
various other interpretations of q.m.


title: Backreacted T-folds and non-geometric regions in configuration space

abstract:
  We provide the backreaction of the T-fold doubly T-dual to a background with
NSNS three-form flux on a three-torus. We extend the backreacted T-fold to
include cases with a flux localized in one out of three directions. We analyze
the resulting monodromy domain walls and vortices. In these backgrounds, we
give an analysis of the action of T-duality on observables like charges and
Wilson surfaces. We analyze arguments for the existence of regions in the
configuration space of second quantized string theory that cannot be reduced to
geometry. Finally, by allowing for space-dependent moduli, we find a
supergravity solution which is a T-fold with hyperbolic monodromies.


title: Biharmonic space-like hypersurfaces in pseudo-Riemannian space

abstract:
  We classify the space-like biharmonic surfaces in 3-dimension
pseudo-Riemannian space form, and construct explicit examples of proper
biharmonic hypersurfaces in general ADS space.


title:
Calculation of the dynamical critical exponent in the model A of
  critical dynamics to order \epsilon^4

abstract:
  A new method based on the R'-operation of the renormalization theory is
proposed for the numerical calculation of the renormalization constants in the
theory of critical behaviour. The problem of finding residues of the poles of
the Green's functions at \epsilon = 0, where \epsilon = 4 - d, is reduced to
the evaluation of multiple UV-finite integrals, which can be performed by means
of standard integration programs. The method is used to calculate the
renormalization group functions of the model A of critical dynamics in
four-loop approximation. Dynamical exponent z of the model A is calculated in
the fourth order of the \epsilon-expansion.


title: Enhanced spin density wave in LaOFeSb

abstract:
  We predict atomic, electronic, and magnetic structures of a hypothetical
compound LaOFeSb by first-principles density-functional calculations. It is
shown that LaOFeSb prefers a stripe-type antiferromagnetic phase (i.e., spin
density wave (SDW) phase) to the non-magnetic (NM) phase, with a larger Fe spin
moment and greater SDW-NM energy difference than those of LaOFeAs. The SDW
phase is found to favor the orthorhombic structure while the tetragonal
structure is more stable in the NM phase. In the NM-phase LaOFeSb, the
electronic bandwidth near the Fermi energy is reduced compared with LaOFeAs,
indicating smaller orbital overlap between Fe $d$ states and subsequently
enhanced intra-atomic exchange coupling. The calculated Fermi surface in the NM
phase consists of three hole and two electron sheets, and shows increased
nesting between two hole and two electron sheets compared with LaOFeAs.
Monotonous changes found in our calculated material properties of LaOFePn
(Pn=P, As, and Sb), along with reported superconducting properties of doped
LaOFeP and LaOFeAs, suggest that doped LaOFeSb may have a higher
superconducting transition temperature.


title:
Co-evolution of elliptical galaxies and their central black holes. Clues
  from their scaling laws

abstract:
  After the discovery that supermassive black holes (SMBHs) are ubiquitous at
the center of stellar spheroids and that their mass Mbh, in the range 10^6-10^9
Msun, is tightly related to global properties of the host stellar system, the
idea of the co-evolution of elliptical galaxies and of their SMBHs has become a
central topic of modern astrophysics. Here, I summarize some consequences that
can be derived from the galaxy Scaling Laws (SLs) and present a coherent
scenario for the formation and evolution of elliptical galaxies and their
central SMBHs, focusing in particular on the establishment and maintenance of
their SLs. In particular, after a first observationally based part, the
discussion focuses on the physical interpretation of the Fundamental Plane.
Then, two important processes in principle able to destroy the galaxy and SMBH
SLs, namely galaxy merging and cooling flows, are analyzed. Arguments
supporting the necessity to clearly distinguish between the origin and
maintenance of the different SLs, and the unavoidable occurrence of SMBH
feedback on the galaxy ISM in the late stages of galaxy evolution (when
elliptical galaxies are sometimes considered as ``dead, red objects''), are
then presented. At the end of the paper I will discuss some implications of the
recent discovery of super-dense ellipticals in the distant Universe. In
particular, I will argue that, if confirmed, these new observations would lead
to the conclusion that at early epochs a relation between the stellar mass of
the galaxy and the mass of the central SMBH should hold, consistent with the
present day Magorrian relation, while the proportionality coefficient between
Mbh and the scale of velocity dispersion of the hosting spheroids should be
significantly smaller than that at the present epoch.


title:
Revisiting unitarity corrections for electromagnetic processes in
  collisions of relativistic nuclei

abstract:
  Unitarity corrections to several electromagnetic processes in collisions of
relativistic heavy nuclei are considered. They are due to the unitarity
requirement for the S-matrix and correspond to the exchange of light-by-light
scattering block between colliding nuclei. We obtain improved results for the
corrections to e+e- and mu+mu- pair production, as well as new results for
unitarity corrections to the production of photons via virtual Compton and
virtual Delbruck scattering. These corrections can be numerically large; e.g.,
the mu+mu- pair production cross section is reduced by about 50% and the
nuclear bremsstrahlung by about 15 to 20%.


title: Unramified representations of reductive groups over finite rings

abstract:
  Lusztig has given a construction of certain representations of reductive
groups over finite local principal ideal rings of characteristic p, extending
the construction of Deligne and Lusztig of representations of reductive groups
over finite fields. We generalize Lusztig's results to reductive groups over
arbitrary finite local rings. This generalization uses the Greenberg functor
and the theory of group schemes over Artinian local rings.


title:
Electronic transport through a C$_{60}$ molecular bridge: The role of
  single and multiple contacts

abstract:
  The effects of different contact geometries, bond dimerization, and gate
voltage on quantum transport through a C$_{60}$ molecule are studied by the
Landauer-B\"{u}ttiker formula based on the Green's function technique. It is
shown that the number of contact points between the device electrodes and the
molecule can play an important role in the electron conduction. The
transmission is due to the resonant tunneling when the electrodes are contacted
to one carbon atom of the molecule. In the case of multiple contacts, the
interference effects are responsible for the change of the transmission through
the C$_{60}$. The bond dimerization and a gate voltage shift the molecular
levels and by adjusting the related parameters the electron conduction can be
controlled.


title:
Development of simulation package 'ELSES' for extra-large-scale
  electronic-structure calculation

abstract:
  An early-stage version of simulation package ' ELSES' (Extra-Large-Scale
Electronic-Structure calculation) is developed for electronic structure and
dynamics of large systems, particularly, nm-scale or 10nm-scale systems
(www.elses.jp). Input and output files are written in the Extensible Markup
Language (XML) style for general users. Related pre-/post-simulation tools are
also available. Practical work flow and example are described. A test
calculation of GaAs bulk system is shown to demonstrate that the present code
can handle systems with more than one atom species. Several future aspects are
also discussed.


title: Ockham's razor and reasoning about information flow

abstract:
  What is the minimal algebraic structure to reason about information flow? Do
we really need the full power of Boolean algebras with co-closure and de Morgan
dual operators? How much can we weaken and still be able to reason about
multi-agent scenarios in a tidy compositional way? This paper provides some
answers.


title: Composition law for polarizers

abstract:
  The polarization process when polarizers act on an optical field is studied.
We give examples for two kinds of polarizers. The first kind presents an
anisotropic absorption - as in a polaroid film - and the second one is based on
total reflection at the interface with a birefringent medium. Using the Stokes
vector representation, we determine explicitly the trajectories of the wave
light polarization during the polarization process. We find that such
trajectories are not always geodesics of the Poincar\'e sphere as it is usually
thought. Using the analogy between light polarization and special relativity,
we find that the action of successive polarizers on the light wave polarization
is equivalent to the action of a single resulting polarizer followed by a
rotation achieved for example by a device with optical activity. We find a
composition law for polarizers similar to the composition law for noncollinear
velocities in special relativity. We define an angle equivalent to the
relativistic Wigner angle which can be used to quantify the quality of two
composed polarizers.


title:
Soft breaking of BRST invariance for introducing non-perturbative
  infrared effects in a local and renormalizable way

abstract:
  The possibility of introducing non-perturbative infrared effects leading to a
modification of the long distance behavior of gauge theories through a soft
breaking of the BRST invariance is investigated. The method reproduces the
Gribov-Zwanziger action describing the restriction of the domain of integration
in the Feynman path integral to the Gribov region and a model for the dynamical
quark mass generation is presented. The soft symmetry breaking relies on the
introduction of BRST doublets and massive physical parameters, which allow one
to distinguish the infrared region from the ultraviolet one, within the same
theory.


title:
Resolution of Hagedorn singularity in superstrings with gravito-magnetic
  fluxes

abstract:
  We consider closed type II and orientifold backgrounds where supersymmetry is
spontaneously broken by asymmetric geometrical fluxes. We show that these can
be used to describe thermal ensembles with chemical potentials associated to
"gravito-magnetic" fluxes. The thermal free energy is computed at the one-loop
string level, and it is shown to be free of the usual Hagedorn-like
instabilities for a certain choice of the chemical potentials. In the closed
string gravitational sector, as well as in the open string matter sector of the
proposed orientifold construction, the free energy turns out to have
"Temperature duality" symmetry, ${\cal F}(T/T_H)={T^2\over T_H^2} {\cal
F}(T_H/T)$, which requires interchanging the space-time spinor representations
$S\leftrightarrow C$. For small temperatures, $T\to 0$, the anti-spinor $C$
decouples from the spectrum while for large temperatures, $T\to \infty$, the
spinor $S$ decouples. In both limits the free energy vanishes, as we recover a
conventional type II superstring theory. At the self dual point $T=T_H$, the
thermal spectra of $S$ and $C$ are identical. Moreover, there are extra
massless scalars in the adjoint representation of an SO(4) non-abelian gauge
symmetry in the closed-string sector, and open-string massless states charged
simultaneously under both the Chan-Paton and the closed-string SO(4) gauge
group.


title:
Comparison results for conjugate and focal points in semi-Riemannian
  geometry via Maslov index

abstract:
  We prove an estimate on the difference of Maslov indices relative to the
choice of two distinct reference Lagrangians of a continuous path in the
Lagrangian Grassmannian of a symplectic space. We discuss some applications to
the study of conjugate and focal points along a geodesic in a semi-Riemannian
manifold.


title: Compact multipliers on spaces of analytic functions

abstract:
  In the paper compact multiplier operators on Banach spaces of analytic
functions on the unit disk with the range in Banach sequence lattices are
studied. If the domain space $X$ is such that $H_\infty\hookrightarrow
X\hookrightarrow H_1$, necessary and sufficient conditions for compactness are
presented. Moreover, the calculation of the Hausdorff measure of noncompactness
for diagonal operators between Banach sequence lattices is applied to obtaining
the characterization of compact multipliers in case the domain space $X$
satisfies $H_\infty\hookrightarrow X\hookrightarrow H_2$.


title: Parton transverse momenta and Drell-Yan dilepton production

abstract:
  The differential cross section for the dilepton production is calculated
including Fermi motion of hadron constituents as well as emission from the
ladders in the formalism of unintegrated parton distributions. We use
unintegrated parton distributions which fulfil Kwieci\'nski evolution
equations. Both zeroth- and first-order (for matrix element) contributions are
included. We calculate azimuthal angular correlations between charged leptons
and deviations from the $p_t(l^+) = p_t(l^-)$ relation. We concentrate on the
distribution in dilepton-pair transverse momentum. We find incident energy and
virtuality dependence of the distribution in transverse momentum of the lepton
pair. We study also azimuthal correlations between jet and dilepton pair and
correlation in the $(p_{1t}(jet),p_{2t}(l^+ l^-))$ space. The results are
compared with experimental data of the R209 and UA1 collaborations.


title:
A Theory of Hypoellipticity and Unique Ergodicity for Semilinear
  Stochastic PDEs

abstract:
  We present a theory of hypoellipticity and unique ergodicity for semilinear
parabolic stochastic PDEs with "polynomial" nonlinearities and additive noise,
considered as abstract evolution equations in some Hilbert space. It is shown
that if Hormander's bracket condition holds at every point of this Hilbert
space, then a lower bound on the Malliavin covariance operator $M_t$ can be
obtained. Informally, this bound can be read as "Fix any finite-dimensional
projection $\Pi$ on a subspace of sufficiently regular functions. Then the
eigenfunctions of $M_t$ with small eigenvalues have only a very small component
in the image of $\Pi$".
  We also show how to use a priori bounds on the solutions to the equation to
obtain good control on the dependency of the bounds on the Malliavin matrix on
the initial condition. These bounds are sufficient in many cases to obtain the
asymptotic strong Feller property introduced in [HairerMattingly06].
  One of the main novel technical tools is an almost sure bound from below on
the size of "Wiener polynomials", where the coefficients are possibly
non-adapted stochastic processes satisfying a Lipschitz condition. By
exploiting the polynomial structure of the equations, this result can be used
to replace Norris' lemma, which is unavailable in the present context.
  We conclude by showing that the two-dimensional stochastic Navier-Stokes
equations and a large class of reaction-diffusion equations fit the framework
of our theory.


title:
On observation of neutron quantum states in Earth gravitational field at
  Laue-Langevin Institute, Grenoble

abstract:
  The experiment performed with ultra-cold neutrons at the Laue-Langevin
Institute, Grenoble, is analyzed in view of the claim that ``neutron quantum
states in Earth gravitational field'' are observed. Our conclusion is that the
above claim is neither theoretically nor experimentally substantiated. We also
criticize the statement that ``observation of the gravitationally bound quantum
states of neutrons and the related experimental techniques provide a unique
tool for a broad range of investigations in fundamental physics of particles
and fields''.


title: Cluster Crystals in Confinement

abstract:
  This paper has been withdrawn by the author(s), due to technical copyright
problems with the Royal Society of Chemistry.


title: On Bounded Integer Programming

abstract:
  We present an efficient reduction from the Bounded integer programming (BIP)
to the Subspace avoiding problem (SAP) in lattice theory. The reduction has
some special properties with some interesting consequences. The first is the
new upper time bound for BIP, $poly(\varphi)\cdot n^{n+o(n)}$ (where $n$ and
$\varphi$ are the dimension and the input size of the problem, respectively).
This is the best bound up to now for BIP. The second consequence is the proof
that #SAP, for some norms, is #P-hard under semi-reductions. It follows that
the counting version of the Generalized closest vector problem is also #P-hard
under semi-reductions. Furthermore, we also show that under some reasonable
assumptions, BIP is solvable in probabilistic time $2^{O(n)}$.


title:
Asymptotic equivariant index of Toeplitz operators and relative index of
  CR structures

abstract:
  Using equivariant Toeplitz operator calculus, we give a new proof of the
Atiyah-Weinstein conjecture on the index of Fourier integral operators and the
relative index of CR structures.


title: MUNU final results

abstract:
  The MUNU detector has been designed to study antineutrino-electron elastic
scattering at low energy. The central tracking detector is a 1 m3 Time
Projection Chamber surrounded by an anti-Compton detector. In this paper the
results from final analysis of the data recorded at 3-bar and 1-bar pressure
are presented. At 3-bar a new upper limit on the neutrino magnetic moment < 9 x
10-11 (7 x 10-11) mu_B at 90 (68%) C.L. is derived. At 1-bar pressure electron
tracks down to 80 keV are measured in the TPC. A 137Cs photopeak is
reconstructed by measuring both the energy and direction of the Compton
electrons in the TPC.


title: Common Envelope Mergers: A Possible Channel for Forming Single sdB Stars

abstract:
  We quantify an evolutionary channel for single sdB stars based on mergers of
binaries containing a red giant star and a lower mass main sequence or brown
dwarf companion in our Galaxy. Population synthesis calculations that follow
mergers during the common envelope phase of evolution of such systems reveal a
population of rapidly rotating horizontal branch stars with a distribution of
core masses between 0.32 Mo - 0.7 Mo that is strongly peaked between 0.47 Mo -
0.54 Mo. The high rotation rates in these stars are a natural consequence of
the orbital angular momentum deposition during the merger and the subsequent
stellar contraction of the merged object from the tip of the red giant branch.
We suggest that centrifugally enhanced mass loss facilitated by the rapid
rotation of these stars may lead to the formation of single sdB stars for some
of these objects.


title: On some deterministic dictionaries supporting sparsity

abstract:
  We describe a new construction of an incoherent dictionary, referred to as
the oscillator dictionary, which is based on considerations in the
representation theory of finite groups. The oscillator dictionary consists of
order of p^5 unit vectors in a Hilbert space of dimension p, where p is an odd
prime, whose pairwise inner products have magnitude of at most 4/sqrt(p). An
explicit algorithm to construct a large portion of the oscillator dictionary is
presented.


title: Single-flavor CSL phase in compact stars

abstract:
  We suggest a scenario where the three light quark flavors are sequentially
deconfined under increasing pressure in cold asymmetric nuclear matter as e.g.
in neutron stars. The basis for our analysis is a chiral quark matter model of
Nambu--Jona-Lasinio (NJL) type with diquark pairing in the spin-1 single flavor
(CSL), spin-0 two flavor (2SC) and three flavor (CFL) channels. We find that
nucleon dissociation sets in at about the saturation density, n_0, when the
down-quark Fermi sea is populated (d-quark dripline) due to the flavor
asymmetry induced by beta-equilibrium and charge neutrality. At about 3n_0
u-quarks appear and a two-flavor color superconducting (2SC) phase is formed.
The s-quark Fermi sea is populated only at still higher baryon density, when
the quark chemical potential is of the order of the dynamically generated
strange quark mass. We construct two different hybrid equations of state (EoS)
using the Dirac-Brueckner Hartree-Fock (DBHF) approach and the EoS by Shen et
al in the nuclear matter sector. The corresponding hybrid star sequences have
maximum masses of, respectively, 2.1 and 2.0 M_solar. Two- and three-flavor
quark-matter phases exist only in gravitationally unstable hybrid star
solutions in the DBHF case, while the Shen-based EoS produce stable
configurations with a 2SC phase component in the core of massive stars. Nucleon
dissociation due to d-quark drip at the crust-core boundary fulfills basic
criteria for a deep crustal heating process which is required to explain
superbusts as well as cooling of X-ray transients.


title: Observation of Spin Glass Dynamics in Dilute LiHo$_x$Y$_{1-x}$F$_4$

abstract:
  AC susceptibility measurements are presented on the dilute, dipolar coupled,
Ising magnet LiHo$_x$Y$_{1-x}$F$_4$ for a concentration $x = 0.045$. The
frequency and temperature dependences of the susceptibility show characteristic
glassy relaxation. The absorption spectrum is found to broaden with decreasing
temperature suggesting that the material is behaving as a spin glass and not as
an exotic spin liquid as was previously observed. A dynamical scaling analysis
suggests a spin glass transition temperature of 42.6 mK $\pm 2$ mK with an
exponent $z\nu = 7.8 \pm 0.23$.