title: Inverse kinetic theory for incompressible thermofluids

abstract:
  An interesting issue in fluid dynamics is represented by the possible
existence of inverse kinetic theories (IKT) which are able to deliver, in a
suitable sense, the complete set of fluid equations which are associated to a
prescribed fluid. From the mathematical viewpoint this involves the formal
description of a fluid by means of a classical dynamical system which advances
in time the relevant fluid fields. The possibility of defining an IKT for the
3D incompressible Navier-Stokes equations (INSE), recently investigated (Ellero
\textit{et al}, 2004-2007) raises the interesting question whether the theory
can be applied also to thermofluids, in such a way to satisfy also the second
principle of thermodynamics. The goal of this paper is to prove that such a
generalization is actually possible, by means of a suitable \textit{extended
phase-space formulation}. We consider, as a reference test, the case of
non-isentropic incompressible thermofluids, whose dynamics is described by the
Fourier and the incompressible Navier-Stokes equations, the latter subject to
the conditions of validity of the Boussinesq approximation.


title: Note on a theorem of Bousfield and Friedlander

abstract:
  We examine the proof of a classical localization theorem of Bousfield and
Friedlander and we remove the assumption that the underlying model category be
right proper. The key to the argument is a lemma about factoring in morphisms
in the arrow category of a model category.


title:
Efficient and robust adiabatic universal quantum computation using
  STIRAP on a qubit chain

abstract:
  It is shown that efficient and robust universal quantum computation is
possible using the stimulated Raman adiabatic passage with a qubit chain as a
pointer register.


title:
Light hadron spectroscopy using domain wall valence quarks on an Asqtad
  sea

abstract:
  We calculate the light hadron spectrum in full QCD using two plus one flavor
Asqtad sea quarks and domain wall valence quarks. Meson and baryon masses are
calculated on a lattice of spatial size $L \approx 2.5$\texttt{fm}, and a
lattice spacing of $a \approx 0.124$\texttt{fm}, for pion masses as light as
$m_\pi \approx 300$\texttt{MeV}, and compared with the results by the MILC
collaboration with Asqtad valence quarks at the same lattice spacing. Two- and
three-flavor chiral extrapolations of the baryon masses are performed using
both continuum and mixed-action heavy baryon chiral perturbation theory. Both
the three-flavor and two-flavor functional forms describe our lattice results,
although the low-energy constants from the next-to-leading order SU(3) fits are
inconsistent with their phenomenological values. Next-to-next-to-leading order
SU(2) continuum formulae provide a good fit to the data and yield and
extrapolated nucleon mass consistent with experiment, but the convergence
pattern indicates that even our lightest pion mass may be at the upper end of
the chiral regime. Surprisingly, our nucleon masses are essentially lineaer in
$m_\pi$ over our full range of pion masses, and we show this feature is common
to all recent dynamical calculations of the nucleon mass. The origin of this
linearity is not presently understood, and lighter pion masses and increased
control of systematic errors will be needed to resolve this puzzling behavior.


title:
Long-time dynamics of a coupled system of nonlinear wave and
  thermoelastic plate equations

abstract:
  We prove the existence of a compact, finite dimensional, global attractor for
a coupled PDE system comprising a nonlinearly damped semilinear wave equation
and a nonlinear system of thermoelastic plate equations, without any mechanical
(viscous or structural) dissipation in the plate component. The plate dynamics
is modelled following Berger's approach; we investigate both cases when
rotational inertia is included into the model and when it is not. A major part
in the proof is played by an estimate--known as stabilizability estimate--which
shows that the difference of any two trajectories can be exponentially
stabilized to zero, modulo a compact perturbation. In particular, this
inequality yields bounds for the attractor's fractal dimension which are
independent of two key parameters, namely $\gamma$ and $\kappa$, the former
related to the presence of rotational inertia in the plate model and the latter
to the coupling terms. Finally, we show the upper semi-continuity of the
attractor with respect to these parameters.


title:
Duality between different mechanisms of QCD factorization in
  \gamma^*\gamma collisions

abstract:
  We study the phenomenon of duality in hard exclusive reactions to which QCD
factorization applies. Considering "two-photon"-like processes in the scalar
$\phi^3_E$ model and also hadron-pair production from the collisions of a real
(transversely polarized) and a highly virtual, longitudinally polarized, photon
in QCD, we identify two regimes of factorization each of them associated with a
distinct nonperturbative mechanism. One mechanism involves twist-3 Generalized
Distribution Amplitudes, whereas the other one employs leading-twist Transition
Distribution Amplitudes. In the case of the scalar $\phi^3_E$ model, we find
duality in that kinematical region where the two mechanisms overlap. In the QCD
case, the appearance of duality is sensitive to the particular nonperturbative
model applied and can, therefore, be used as an additional adjudicator.


title:
Entanglement and intra-molecular cooling in biological systems? - A
  quantum thermodynamic perspective

abstract:
  We discuss the possibility of existence of entanglement in biological
systems. Our arguments centre on the fact that biological systems are
thermodynamic open driven systems far from equilibrium. In such systems error
correction can occur which may maintain entanglement despite high levels of
de-coherence. We also discuss the possibility of cooling (classical or quantum)
at molecular level.


title: Interpolation in local theory extensions

abstract:
  In this paper we study interpolation in local extensions of a base theory. We
identify situations in which it is possible to obtain interpolants in a
hierarchical manner, by using a prover and a procedure for generating
interpolants in the base theory as black-boxes. We present several examples of
theory extensions in which interpolants can be computed this way, and discuss
applications in verification, knowledge representation, and modular reasoning
in combinations of local theories.


title: Cosmic antimatter: models and observational bounds

abstract:
  A model which leads to abundant antimatter objects in the Galaxy
(anti-clouds, anti-stars, etc) is presented. Observational manifestations are
analyzed. In particular, the model allows for all cosmological dark matter to
be made out of compact baryonic and antibaryonic objects.


title: Minimal Lee-Wick Extension of the Standard Model

abstract:
  We consider a minimal Lee-Wick (LW) extension to the Standard Model in which
the fields providing the most important contributions to the cancellation of
quadratic divergences are the lightest. Partners to the SU(2) gauge bosons,
Higgs, top quark, and left-handed bottom quark are retained in the low-energy
effective theory, which is valid up to approximately 10 TeV; the remaining LW
partners appear above this cutoff and complete the theory in the ultraviolet.
We determine the constraints on the low-energy spectrum from the electroweak
parameters S and T, and find LW states within the kinematic reach of the LHC at
the 95% confidence level.


title:
Completeness of the Lattice-Boltzmann IKT approach for classical
  incompressible fluids

abstract:
  Despite the abundant literature on the subject appeared in the last few
years, the lattice Boltzmann method (LBM) is probably the one for which a
complete understanding is not yet available. As an example, an unsolved
theoretical issue is related to the construction of a discrete kinetic theory
which yields \textit{exactly} the fluid equations, i.e., is non-asymptotic
(here denoted as \textit{LB inverse kinetic theory}). The purpose of this paper
aims at investigating discrete inverse kinetic theories (IKT) for
incompressible fluids. We intend to show that the discrete IKT can be defined
in such a way to satisfy, in particular, the requirement of
\emph{completeness}, i.e., {\it all} fluid fields are expressed as moments of
the kinetic distribution function and {\it all} hydrodynamic equations can be
identified with suitable moment equations of an appropriate inverse kinetic
equation IKE.


title: Attraction towards an inflection point inflation

abstract:
  Many models of high energy physics possess metastable vacua. It is
conceivable that the universe can get trapped in such a false vacuum,
irrespective of its origin and prior history, at an earlier stage during its
evolution. The ensuing false vacuum inflation results in a cold and empty
universe and has a generic graceful exit problem. We show that an inflection
point inflation along the flat directions of the Minimal Supersymmetric
Standard Model (MSSM) can resolve this graceful exit problem by inflating the
bubble which nucleate out of a false vacuum. The important point is that the
initial condition for an MSSM inflation can be naturally realized, due to an
attractor behavior towards the inflection point. We investigate these issues in
detail and also present an example where metastable vacua, hence the false
vacuum inflation, can happen within the MSSM.


title:
Dimensional reduction as a method to obtain dual theories for massive
  spin two in arbitray dimensions

abstract:
  Using the parent Lagrangian method together with a dimensional reduction from
$D$ to $(D-1)$ dimensions we construct dual theories for massive spin two
fields in arbitrary dimensions in terms of a mixed symmetry tensor
$T_{A[A_{1}A_{2}... A_{D-2}]}$. Our starting point is the well studied massless
parent action in dimension $D$. The resulting massive Stueckelberg-like parent
actions in $(D-1)$ dimensions inherits all the gauge symmetries of the original
massless action and can be gauge fixed in two alternative ways, yielding the
possibility of having either a parent action with a symmetric or a
non-symmetric Fierz-Pauli field $e_{AB}$. Even though the dual sector in terms
of the standard spin two field includes only the symmetrical part $e_{\{AB\}}$
in both cases, these two possibilities yield different results in terms of the
alternative dual field $T_{A[A_{1}A_{2}... A_{D-2}]}$. In particular, the
non-symmetric case reproduces the Freund-Curtright action as the dual to the
massive spin two field action in four dimensions.


title: Enhanced diffusion and ordering of self-propelled rods

abstract:
  Starting from a minimal physical model of self propelled hard rods on a
substrate in two dimensions, we derive a modified Smoluchowski equation for the
system. Self -propulsion enhances longitudinal diffusion and modifies the mean
field excluded volume interaction. From the Smoluchowski equation we obtain
hydrodynamic equations for rod concentration, polarization and nematic order
parameter. New results at large scales are a lowering of the density of the
isotropic-nematic transition and a strong enhancement of boundary effects in
confined self-propelled systems.


title: Applying the POWHEG method to top pair production and decays at the ILC

abstract:
  We study the effects of gluon radiation in top pair production and their
decays for e+e- annihilation at the ILC. To achieve this we apply the POWHEG
method and interface our results to the Monte Carlo event generator Herwig++.
We consider a center-of-mass energy of \sqrt{s}=500 GeV and compare decay
correlations and bottom quark and anti-quark distributions before
hadronization.


title:
Moments of exit times from wedges for non-homogeneous random walks with
  asymptotically zero drifts

abstract:
  We study quantitative asymptotics of planar random walks that are spatially
non-homogeneous but whose mean drifts have some regularity. Specifically, we
study the first exit time $\tau_\alpha$ from a wedge with apex at the origin
and interior half-angle $\alpha$ by a non-homogeneous random walk on the square
lattice with mean drift at $x$ of magnitude $O(1/|x|)$ as $|x| \to \infty$.
This is the critical regime for the asymptotic behaviour: under mild
conditions, a previous result of the authors (see arXiv:0910.1772) stated that
$\tau_\alpha < \infty$ a.s. for any $\alpha$ (while for a stronger drift field
$\tau_\alpha$ is infinite with positive probability). Here we study the more
difficult problem of the existence and non-existence of moments
$E[\tau_\alpha^s]$, $s>0$. Assuming (in common with much of the literature) a
uniform bound on the walk's increments, we show that for $\alpha < \pi/2$ there
exists $s_0 \in (0,\infty)$ such that $E[\tau_\alpha^s]$ is finite for $s <
s_0$ but infinite for $s > s_0$; under specific assumptions on the drift field
we show that we can attain $E[\tau_\alpha^s] = \infty$ for any $s > 1/2$. We
show that for $\alpha \leq \pi$ there is a phase transition between drifts of
magnitude $O(1/|x|)$ (the critical regime) and $o(1/|x|)$ (the subcritical
regime). In the subcritical regime we obtain a non-homogeneous random walk
analogue of a theorem for Brownian motion due to Spitzer, under considerably
weaker conditions than those previously given (including work by Varopoulos)
that assumed zero drift.


title: A note on matrix model with IR cutoff and AdS/CFT

abstract:
  We propose an effective model of strongly coupled gauge theory at finite
temperature on $R^3$ in the presence of an infrared cutoff. It is constructed
by considering the theory on $S^3$ with an infrared cutoff and then taking the
size of the $S^3$ to infinity while keeping the cutoff fixed. This model
reproduces various qualitative features expected from its gravity dual.


title: N=4 BPS black holes and octonionic twistors

abstract:
  Stationary, spherically symmetric solutions of N=2 supergravity in 3+1
dimensions have been shown to correspond to holomorphic curves on the twistor
space of the quaternionic-K\"ahler space which arises in the dimensional
reduction along the time direction. In this note, we generalize this result to
the case of 1/4-BPS black holes in N=4 supergravity, and show that they too can
be lifted to holomorphic curves on a "twistor space" Z, obtained by fibering
the Grassmannian F=SO(8)/U(4) over the moduli space in three-dimensions
SO(8,n_v+2)/SO(8)xSO(n_v+2). This provides a kind of octonionic generalization
of the standard constructions in quaternionic geometry, and may be useful for
generalizing the known BPS black hole solutions, and finding new non-BPS
extremal solutions.


title:
Defect-induced incompatibility of elastic strains: dislocations within
  the Landau theory of martensitic phase transformations

abstract:
  In dislocation-free martensites the components of the elastic strain tensor
are constrained by the Saint-Venant compatibility condition which guarantees
continuity of the body during external loading. However, in dislocated
materials the plastic part of the distortion tensor introduces a displacement
mismatch that is removed by elastic relaxation. The elastic strains are then no
longer compatible in the sense of the Saint-Venant law and the ensuing
incompatibility tensor is shown to be proportional to the gradients of the Nye
dislocation density tensor. We demonstrate that the presence of this
incompatibility gives rise to an additional long-range contribution in the
inhomogeneous part of the Landau energy functional and to the corresponding
stress fields. Competition amongst the local and long-range interactions
results in frustration in the evolving order parameter (elastic) texture. We
show how the Peach-Koehler forces and stress fields for any distribution of
dislocations in arbitrarily anisotropic media can be calculated and employed in
a Fokker-Planck dynamics for the dislocation density. This approach represents
a self-consistent scheme that yields the evolutions of both the order parameter
field and the continuous dislocation density. We illustrate our method by
studying the effects of dislocations on microstructure, particularly twinned
domain walls, in an Fe-Pd alloy undergoing a martensitic transformation.


title: The SIRI stochastic model with creation and annihilation operators

abstract:
  We generalize the well known formulation of the susceptibles, infected,
susceptibles (SIS) spatial epidemics with creation and annihilation operators
to the reinfection model including recovered which can be reinfected, the SIRI
model, using ladder operators constructed from the Gell-Mann matrices known in
quantum chromodynamics.


title: Springer theory via the Hitchin fibration

abstract:
  In this paper, we translate the Springer theory of Weyl group representations
into the language of symplectic topology. Given a semisimple complex group G,
we describe a Lagrangian brane in the cotangent bundle of the adjoint quotient
g/G that produces the perverse sheaves of Springer theory. The main technical
tool is an analysis of the Fourier transform for constructible sheaves from the
perspective of the Fukaya category. Our results can be viewed as a toy model of
the quantization of Hitchin fibers in the Geometric Langlands program.


title: Energy fluctuations in a biharmonically driven nonlinear system

abstract:
  We study the fluctuations of work done and dissipated heat of a Brownian
particle in a symmetric double well system. The system is driven by two
periodic input signals that rock the potential simultaneously. Confinement in
one preferred well can be achieved by modulating the relative phase between the
drives. We show that in the presence of pumping the stochastic resonance signal
is enhanced when analyzed in terms of the average work done on the system per
cycle. This is in contrast to the case when pumping is achieved by applying an
external static bias, which degrades resonance. We analyze the nature of work
and heat fluctuations and show that the steady state fluctuation theorem holds
in this system.


title:
Exploiting Quench Dynamics in Spin Chains for Distant Entanglement and
  Quantum Communication

abstract:
  We suggest a method of entangling significantly the distant ends of a spin
chain using minimal control. This entanglement between distant individual spins
is brought about solely by exploiting the dynamics of an initial mixed state
with Neel order if the lattice features nearest-neighbor XXZ interaction. There
is no need to control single spins or to have engineered couplings or to pulse
globally. The method only requires an initial nonadiabatic switch (a quench)
between two Hamiltonians followed by an evolution under the second Hamiltonian.
The scheme is robust to randomness of the couplings as well as the finiteness
of an appropriate quench and could potentially be implemented in various
experimental setups, ranging from atoms in optical lattices to
Josephson-junction arrays.


title: Gaussian Effective Potential and Antiferromagnetism in the Hubbard Model

abstract:
  The Gaussian Effective Potential (GEP) is shown to be a useful variational
tool for the study of the magnetic properties of strongly correlated electronic
systems. The GEP is derived for a single band Hubbard model on a
two-dimensional bi-partite square lattice in the strong coupling regime. At
half-filling the antiferromagnetic order parameter emerges as the minimum of
the effective potential with an accuracy which improves over RPA calculations
and is very close to that achieved by Monte Carlo simulations. Extensions to
other magnetic systems are discussed.


title: AGN Jet-induced Feedback in Galaxies. I. Suppression of Star Formation

abstract:
  (Abridged) We study the interaction of relativistic jets from AGNs with the
ISM in their host galaxy, using a series of Adaptive Mesh Refinement
simulations of the evolution of the interaction between the cocoon produced by
the jet with a dense cloud, placed very near the cocoon's path. We vary only
the jet's input power between P_{jet} = 10^{41}-10^{47} {\rm erg/sec}. The
density Probability Distribution Function (PDF) within the cocoon can be
described in terms of two distinct components, which are also spatially
distinct: a low- and a high-density component. The PDF of the post-shocked
region is well approximated by a modified lognormal distribution, for all
values of $P_{jet}$. During the active phase, when the jet is fed by the AGN,
the cloud is subject both to compression and stripping, which tend to increase
its density and diminish its total mass. When the jet is switched off (i.e.
during the passive phase) the shocked cloud cools further and tends to become
more filamentary, under the action of a back-flow which develops within the
cocoon. We study the evolution of the star formation rate within the cloud,
assuming that is determined by a Schmidt-Kennicutt law, and we analyze the
different physical factors which have an impact on the star formation rate. We
show that, although the star formation rate can occasionally increase, on time
scales of the order of $10^{5}-10^{6}$ yrs, star formation will be inhibited
and the cloud fragments. The cooling time of the environment within which the
cloud is embedded is however very long: thus, star formation from the
fragmented cloud remains strongly inhibited.


title:
A coordination-based approach to elasticity of floppy and stiff random
  networks

abstract:
  We study the role of connectivity on the linear and nonlinear elastic
behavior of amorphous systems using a two-dimensional random network of
harmonic springs as a model system. A natural characterization of these systems
arises in terms of the network coordination relative to that of an isostatic
network $\delta z$; a floppy network has $\delta z<0$, while a stiff network
has $\delta z>0$. Under the influence of an externally applied load we observe
that the response of both floppy and rigid network are controlled by the same
critical point, corresponding to the onset of rigidity. We use numerical
simulations to compute the exponents which characterize the shear modulus, the
amplitude of non-affine displacements, and the network stiffening as a function
of $\delta z$, derive these theoretically and make predictions for the
mechanical response of glasses and fibrous networks.


title: Problems of robustness for universal coding schemes

abstract:
  The Lempel-Ziv universal coding scheme is asymptotically optimal for the
class of all stationary ergodic sources. A problem of robustness of this
property under small violations of ergodicity is studied. A notion of
deficiency of algorithmic randomness is used as a measure of disagreement
between data sequence and probability measure. We prove that universal
compressing schemes from a large class are non-robust in the following sense:
if the randomness deficiency grows arbitrarily slowly on initial fragments of
an infinite sequence then the property of asymptotic optimality of any
universal compressing algorithm can be violated. Lempel-Ziv compressing
algorithms are robust on infinite sequences generated by ergodic Markov chains
when the randomness deficiency of its initial fragments of length $n$ grows as
$o(n)$.


title:
Constructing explicit magnetic analogies for the dynamics of glass
  forming liquids

abstract:
  By defining a spatially varying replica overlap parameter for a supercooled
liquid referenced to an ensemble of fiducial liquid state configurations we
explicitly construct a constrained replica free energy functional that maps
directly onto an Ising Hamiltonian with both random fields and random
interactions whose statistics depend on liquid structure. Renormalization group
results for random magnets when combined with these statistics for the
Lennard-Jones glass suggest that discontinuous replica symmetry breaking would
occur if a liquid with short range interactions could be equilibrated at a
sufficiently low temperature where its mean field configurational entropy would
vanish, even though the system strictly retains a finite configurational
entropy.


title:
Modeling the Impulsive Noise Component and its Effect on the Operation
  of a Simple Coherent Network Algorithm for Unmodeled Gravitational Wave
  Bursts Detection

abstract:
  An analytic model a la Middleton of the impulsive noise component in the data
of interferometric gravitational wave detectors is proposed, based on an atomic
representation of glitches. A fully analytic characterization of the coherent
network data analysis algorithm proposed by Rakhmanov and Klimenko is obtained,
for the simplest relevant case of triggered detection of unmodeled
gravitational wave bursts, using the above noise model. The detector's
performance is evaluated under a suitable central-limit hypothesis, and the
effects of both the noisiness of the pseudo-templates, and the presence of the
impulsive noise component are highlighted.


title: Exploring the Lattice Gas Model for isoscaling

abstract:
  Isotopic spin dependent lattice gas model is used to examine if it produces
the isoscaling behaviour seen in intermediate energy heavy ion collisions.
Qualitative features are reproduced but quantitative agreement with experiments
is lacking.


title:
Torus bifurcations, isolas and chaotic attractors in a simple dengue
  model with ADE and temporary cross immunity

abstract:
  We analyse an epidemiological model of competing strains of pathogens and
hence differences in transmission for first versus secondary infection due to
interaction of the strains with previously aquired immunities, as has been
described for dengue fever (in dengue known as antibody dependent enhancement,
ADE). Such models show a rich variety of dynamics through bifurcations up to
deterministic chaos. Including temporary cross-immunity even enlarges the
parameter range of such chaotic attractors, and also gives rise to various
coexisting attractors, which are difficult to identify by standard numerical
bifurcation programs using continuation methods. A combination of techniques,
including classical bifurcation plots and Lyapunov exponent spectra has to be
applied in comparison to get further insight into such dynamical structures.
Here we present for the first time multi-parameter studies in a range of
biologically plausible values for dengue. The multi-strain interaction with the
immune system is expected to also have implications for the epidemiology of
other diseases.


title: A New Causal Interpretation of EPR-B Experiment

abstract:
  In this paper we study a two-step version of EPR-B experiment, the Bohm
version of the Einstein-Podolsky-Rosen experiment. Its theoretical resolution
in space and time enables us to refute the classic "impossibility" to decompose
a pair of entangled atoms into two distinct states, one for each atom. We
propose a new causal interpretation of the EPR-B experiment where each atom has
a position and a spin while the singlet wave function verifies the two-body
Pauli equation. In conclusion we suggest a physical explanation of non-local
influences, compatible with Einstein's point of view on relativity.


title:
Global attractor and asymptotic smoothing effects for the weakly damped
  cubic Schr\"odinger equation in $L^2(\T)$

abstract:
  We prove that the weakly damped cubic Schr\"odinger flow in $L^2(\T)$
provides a dynamical system that possesses a global attractor. The proof relies
on a sharp study of the behavior of the associated flow-map with respect to the
weak $ L^2(\T) $-convergence inspired by a previous work of the author.
Combining the compactness in $ L^2(\T) $ of the attractor with the approach
developed by Goubet, we show that the attractor is actually a compact set of $
H^2(\T) $. This asymptotic smoothing effect is optimal in view of the
regularity of the steady states.


title:
"Kohn-Shamification" of the classical density-functional theory of
  inhomogeneous polar molecular liquids with application to liquid hydrogen
  chloride

abstract:
  The Gordian knot of density-functional theories for classical molecular
liquids remains finding an accurate free-energy functional in terms of the
densities of the atomic sites of the molecules. Following Kohn and Sham, we
show how to solve this problem by considering noninteracting molecules in a set
of effective potentials. This shift in perspective leads to an accurate and
computationally tractable description in terms of simple three-dimensional
functions. We also treat both the linear- and saturation- dielectric responses
of polar systems, presenting liquid hydrogen chloride as a case study.


title: Consecutive integers in high-multiplicity sumsets

abstract:
  Sharpening (a particular case of) a result of Szemeredi and Vu and extending
earlier results of Sarkozy and ourselves, we find, subject to some technical
restrictions, a sharp threshold for the number of integer sets needed for their
sumset to contain a block of consecutive integers of length, comparable with
the lengths of the set summands.
  A corollary of our main result is as follows. Let $k,l\ge 1$ and $n\ge 3$ be
integers, and suppose that $A_1,...,A_k\subset[0,l]$ are integer sets of size
at least $n$, none of which is contained in an arithmetic progression with
difference greater than 1. If $k\ge 2\lceil(l-1)/(n-2)\rceil$, then the sumset
$A_1+...+A_k$ contains a block of consecutive integers of length $k(n-1)$.


title:
Spectrum of positive and negative parity pentaquarks, including
  $SU(3)_F$ breaking

abstract:
  We present the spectrum of the lightest pentaquark states of both parities
and compare it with the present experimental evidence for these states. We have
assumed that the main role for their mass splittings is played by the
chromo-magnetic interaction. We have also kept into account the $SU(3)_F$
breaking for their contribution and for the spin orbit term. The resulting
pattern is in good agreement with experiment.


title:
Velocity oscillations in confined channel flows of concentrated
  colloidal suspensions

abstract:
  We study the pressure-driven flow of concentrated colloids confined in glass
micro-channels at the single particle level using fast confocal microscopy. For
channel to particle size ratios $a/\bar{D} \lesssim 30$, the flow rate of the
suspended particles shows fluctuations. These turn into regular oscillations
for higher confinements ($a/\bar{D} \simeq 20$). We present evidence to link
these oscillations with the relative flow of solvent and particles (permeation)
and the effect of confinement on shear thickening.


title: Exact entanglement renormalization for string-net models

abstract:
  We construct an explicit renormalization group (RG) transformation for Levin
and Wen's string-net models on a hexagonal lattice. The transformation leaves
invariant the ground-state "fixed-point" wave function of the string-net
condensed phase. Our construction also produces an exact representation of the
wave function in terms of the multi-scale entanglement renormalization ansatz
(MERA). This sets the stage for efficient numerical simulations of string-net
models using MERA algorithms. It also provides an explicit quantum circuit to
prepare the string-net ground-state wave function using a quantum computer.


title: The young Galactic star cluster [DBS2003]179

abstract:
  Recent near- and mid-infrared surveys have brought evidence that the Milky
Way continues to form massive clusters. We carry out a program to determine the
basic physical properties of the new massive cluster candidate [DBS2003]179.
Medium-resolution K-band spectra and deep near-infrared images of [DBS2003]179
were used to derive the spectral types of eight member stars, and to estimate
the distance and reddening to the cluster. Seven of ten stars with spectra show
emission lines. Comparison with template spectra indicated that they are early
O-type stars. The mean radial velocity of the cluster is Vrad=-77+-6 km/s.
Knowing the spectral types of the members and the color excesses, we determined
extinction Av~16.6 and distance modulus (m-M)0~14.5 mag (D~7.9 kpc). The
presence of early O-stars and a lack of red supergiants suggests a cluster age
of 2-5Myr. The total cluster mass is approximated to 0.7x10^4 Msun and it is
not yet dynamically relaxed.
  The candidate [DBS2003]179 further increases the family of the massive young
clusters in the Galaxy, although it appears less massive than the prototypical
starburst clusters.


title: CP violation in hadronic tau decays

abstract:
  We examine CP violation in the Delta S=0 decays tau -> omega pi nu_tau and
tau -> a_1 pi nu_tau and the Delta S=1 decay tau -> K pi pi nu_tau. We assume
that the new physics is a charged Higgs. We show that sizeable CP-violating
effects are possible in tau -> a_1 pi nu_tau (polarization-dependent rate
asymmetry) and tau -> omega pi nu_ tau (triple-product asymmetry). The Delta
S=1 decay tau -> K pi pi nu_tau can proceed via several resonances. We
construct two modified rate asymmetries and a triple product asymmetry for this
decay and discuss the potential sensitivities of these asymmetries.


title:
Low energy chiral constants from epsilon-regime simulations with
  improved Wilson fermions

abstract:
  We present a lattice QCD calculation of the low energy constants of the
leading order chiral Lagrangian. In these simulations the epsilon regime is
reached by using tree-level improved nHYP Wilson fermions combined with
reweighting in the quark mass. We analyze two point functions on two ensembles
with lattices of size (1.85fm)^4 and (2.8fm)^4, and at several quark mass
values between 4 and 20 MeV. The data are well fitted with next-to-leading
order chiral perturbative formulae and predict F=90(4)MeV and
Sigma^(1/3)=248(6)MeV in the MS-bar scheme at 2 GeV.


title:
The HARPS search for southern extra-solar planets. XIII. A planetary
  system with 3 Super-Earths (4.2, 6.9, & 9.2 Earth masses)

abstract:
  This paper reports on the detection of a planetary system with three
Super-Earths orbiting HD40307. HD40307 is a K2V metal-deficient star at a
distance of only 13 parsec, part of the HARPS GTO high-precision planet-search
programme. The three planets on circular orbits have very low minimum masses of
respectively 4.2, 6.9 and 9.2 Earth masses and periods of 4.3, 9.6 and 20.5
days. The planet with the shortest period is the lightest planet detected
to-date orbiting a main sequence star. The detection of the correspondingly low
amplitudes of the induced radial-velocity variations is completely secured by
the 135 very high-quality HARPS observations illustrated by the radial-velocity
residuals around the 3-Keplerian solution of only 0.85 m/s. Activity and
bisector indicators exclude any significant perturbations of stellar intrinsic
origin, which supports the planetary interpretation. Contrary to most
planet-host stars, HD40307 has a marked sub-solar metallicity ([Fe/H]=-0.31),
further supporting the already raised possibility that the occurrence of very
light planets might show a different dependence on host star's metallicity
compared to the population of gas giant planets. In addition to the 3 planets
close to the central star, a small drift of the radial-velocity residuals
reveals the presence of another companion in the system the nature of which is
still unknown.


title: Generating Simplicial Complexes

abstract:
  In the spirit of topological entropy we introduce new complexity functions
for general dynamical systems (namely groups and semigroups acting on closed
manifolds) but with an emphasis on the dynamics induced on simplicial
complexes. For expansive systems remarkable properties are observed. Known
examples are revisited and new examples are presented.


title: Spin Chains in N=6 Superconformal Chern-Simons-Matter Theory

abstract:
  In this note we study spin chain operators in the N=6 Chern-Simons-matter
theory recently proposed by Aharony, Bergman, Jafferis and Maldacena to be dual
to type IIA string theory in AdS4xCP3. We study the two-loop dilatation
operator in the gauge theory, and compare to the Penrose limit on the string
theory side.


title: A periodic orbit basis for the Quantum Baker Map

abstract:
  A set of quantum states, dynamically related to the classical periodic orbits
of a chaotic map, is used as a basis in which the description of the
eigenstates of its quantum version is greatly simplified. This set can be
improved with the inclusion of short time propagation along the stable and
unstable manifolds of the periodic orbits resulting in a construction similar
to the scar functions of Vergini (Jour. Phys. A \textbf{33}, (2000) 4709). The
average participation ratio is used to quantify the quality of the basis.


title:
Infrared Photometry and Evolution of Mass-Losing AGB Stars. II.
  Luminosity and Colors of MS and S Stars

abstract:
  AGB phases mark the end of the evolution for Low- and Intermediate-Mass
Stars. Our understanding of the mechanisms through which they eject the
envelope and our assessment of their contribution to the chemical evolution of
Galaxies are hampered by poor knowledge of their Luminosities and mass loss
rates,both for C-rich and for O-rich sources.We plan to establish criteria
permitting a more quantitative determination of luminosities for the various
types of AGB stars on the basis of IR fluxes.In this paper we concentrate on
O-rich and s-element-rich MS, S stars and include a small sample of SC stars.We
reanalyze the absolute bolometric magnitudes and colors of MS, S, SC stars on
the basis of a sample of intrinsic and extrinsic long period variables.We
derive bolometric corrections as a function of near- and mid-IR colors,adopting
as references a group of stars for which the SED could be reconstructed in
detail over a large wavelength range.We determine the absolute HR diagrams and
compare luminosities and colors of S-type giants with those of C-rich AGB
stars. Luminosity estimates are also verified on the basis of existing
Period-Luminosity relations valid for O-rich Miras.S star bolometric
luminosities are almost indistinguishable from those of C-rich AGB stars.Their
circumstellar envelopes are thinner and less opaque.Despite this last property
the IR wavelengths remain dominant, with the bluest stars having their maximum
emission in the H or K bands.Based on Period-Luminosity relations for O-rich
Miras and on Magnitude-color relations for the same variables we show how
approximate distances for sources of so far unknown parallax can be inferred.
We argue that most of the sources have a rather small mass(<2Msun);dredge-up
might then be not effective enough to let the C/O ratio exceed unity.


title: Renormalizable $A_4$ Model for Lepton Sector

abstract:
  We revisit $A_4$ flavor symmetry for the lepton sector with minimal Higgs
sector, namely just one $A_4-$triplet SU(2)-doublet scalar. To increase
predictivity even further, we impose the constraint of renormalizability. A
geometric interpretation of an $A_4-$triplet aids our understanding of
tribimaximal mixing. To increase predictivity even further, we impose the
constraint of renormalizability. We investigate the neutrino mass hierarchy in
such a minimal $A_4$ model and find there are two solutions: one with $m_2 \gg
m_1 = m_3$ is phenomenologically unacceptable; the other with $m_3 \gg m_1 =
m_2$ is a normal hierarchy. An inverted hierarchy is impossible without
addition of more parameters by either more Higgs scalars or higher-order
irrelevant operators.


title:
Decays of B_s Mesons and b Baryons: A Review of Recent First
  Observations and Branching Fractions

abstract:
  Recent rate measurements of B_s mesons and Lambda_b baryons produced in
sqrt{s} = 1.96 TeV proton-antiproton and Upsilon(5S) electron-positron
collisions are reviewed, including the first observations of six new decay
modes: B_s -> D_s^+ K^- (CDF), B_s -> D_s^- D_s^+ (CDF), B_s -> D_{s1}^-(2536)
mu^+ nu_mu X (DZero), B_s -> phi gamma (Belle), Lambda_b -> p pi^- (CDF), and
Lambda_b -> p K^- (CDF). Also examined are branching-fraction measurements or
limits for the B_s -> D_s^{(*)} D_s^{(*)} modes (Belle, CDF, and DZero), the
B_s -> gamma gamma radiative penguin decay (Belle), and three two-body
charmless B_s meson decay channels (CDF). Implications for the phenomenology of
electroweak and QCD physics, as well as searches for physics beyond the
Standard Model, are identified where applicable.


title:
Higher Curvature Corrections to Primordial Fluctuations in Slow-roll
  Inflation

abstract:
  We study higher curvature corrections to the scalar spectral index, the
tensor spectral index, the tensor-to-scalar ratio, and the polarization of
gravitational waves. We find that the higher curvature corrections can not be
negligible in the dynamics of the scalar field, although they are energetically
negligible. Indeed, it turns out that the tensor-to-scalar ratio could be
enhanced and the tensor spectral index could be blue due to the Gauss-Bonnet
term. We estimate the degree of circular polarization of gravitational waves
generated during the slow-roll inflation. We argue that the circular
polarization can be observable with the help both of the Gauss-Bonnet and
parity violating terms. We also present several examples to reveal
observational implications of higher curvature corrections for chaotic
inflationary models.


title: Statistical auditing and randomness test of lotto k/N-type games

abstract:
  One of the most popular lottery games worldwide is the so-called ``lotto
k/N''. It considers N numbers 1,2,...,N from which k are drawn randomly,
without replacement. A player selects k or more numbers and the first prize is
shared amongst those players whose selected numbers match all of the k randomly
drawn. Exact rules may vary in different countries.
  In this paper, mean values and covariances for the random variables
representing the numbers drawn from this kind of game are presented, with the
aim of using them to audit statistically the consistency of a given sample of
historical results with theoretical values coming from a hypergeometric
statistical model. The method can be adapted to test pseudorandom number
generators.


title:
Rigidity-based approach to the boson peak in amorphous solids: from
  sphere packing to amorphous silica

abstract:
  Glasses have a large excess of low-frequency vibrational modes in comparison
with continuous elastic body, the so-called Boson Peak, which appears to
correlate with several crucial properties of glasses, such as transport or
fragility. I review recent results showing that the Boson Peak is a necessary
consequence of the weak connectivity of the solid. I explain why in assemblies
repulsive spheres the boson peak shifts up to zero frequency as the pressure is
lowered toward the jamming threshold, and derive the corresponding exponent. I
show how these ideas capture the main low-frequency features of the vibrational
spectrum of amorphous silica. These results extend arguments of Phillips on the
presence of floppy modes in under-constrained covalent networks to glasses
where the covalent network is rigid, or when interactions are purely radial.


title: Spectral and scattering theory for some abstract QFT Hamiltonians

abstract:
  We introduce an abstract class of bosonic QFT Hamiltonians and study their
spectral and scattering theories. These Hamiltonians are of the form
$H=\d\G(\omega)+ V$ acting on the bosonic Fock space $\G(\ch)$, where $\omega$
is a massive one-particle Hamiltonian acting on $\ch$ and $V$ is a Wick
polynomial $\Wick(w)$ for a kernel $w$ satisfying some decay properties at
infinity. We describe the essential spectrum of $H$, prove a Mourre estimate
outside a set of thresholds and prove the existence of asymptotic fields. Our
main result is the {\em asymptotic completeness} of the scattering theory,
which means that the CCR representations given by the asymptotic fields are of
Fock type, with the asymptotic vacua equal to the bound states of $H$. As a
consequence $H$ is unitarily equivalent to a collection of second quantized
Hamiltonians.


title: Rational Symplectic Field Theory for Legendrian knots

abstract:
  We construct a combinatorial invariant of Legendrian knots in standard
contact three-space. This invariant, which encodes rational relative Symplectic
Field Theory and extends contact homology, counts holomorphic disks with an
arbitrary number of positive punctures. The construction uses ideas from string
topology.


title: Synthesis and Properties of CaFe$_2$As$_2$ Single Crystals

abstract:
  We report the synthesis and basic physical properties of single crystals of
CaFe2As2, an isostructural compound to BaFe2As2 which has been recently doped
to produce superconductivity. CaFe2As2 crystalizes in the ThCr2Si2 structure
with lattice parameters a = 3.907(4) A and c = 11.69(2) A. Magnetic
susceptibility, resistivity, and heat capacity all show a first order phase
transition at T_0 171 K. The magnetic susceptibility is nearly isotropic from 2
K to 350 K. The heat capacity data gives a Sommerfeld coefficient of 8.2 +- 0.3
mJ/molK2, and does not reveal any evidence for the presence of high frequency
(> 300 K) optical phonon modes. The Hall coefficient is negative below the
transition indicating dominant n-type carriers.


title: Direct Extraction Of One Loop Rational Terms

abstract:
  We present a method for the direct extraction of rational contributions to
one-loop scattering amplitudes, missed by standard four-dimensional unitarity
techniques. We use generalised unitarity in $D=4-2\e$ dimensions to write the
loop amplitudes in terms of products of massive tree amplitudes. We find that
the rational terms in $4-2\e$ dimensions can be determined from quadruple,
triple and double cuts without the need for independent pentagon contributions
using a massive integral basis. The additional mass-dependent integral
coefficients may then be extracted from the large mass limit which can be
performed analytically or numerically. We check the method by computing the
rational parts of all gluon helicity amplitudes with up to six external legs.
We also present a simple application to amplitudes with external massless
fermions.


title: e^+ e^- -> 3 jets and event shapes at NNLO

abstract:
  We report on the calculation of NNLO corrections to the 3-jet cross section
and related event shape distributions in electron-positron annihilation. The
corrections are sizable for all variables, however the magnitude of the
corrections is substantially different for different observables. We observe
that inclusion of the NNLO corrections yields a considerably better agreement
between theory and experimental data both in shape and normalization of the
event shape distributions in the region where the perturbative result is
expected to hold. A new extraction of $\alpha_{s}$ using the event shape
variables up to NNLO yields a considerably better consistency between the
observables indicating a stabilization of the perturbative corrections at this
order.


title: Nonlinear viscous hydrodynamics in various dimensions using AdS/CFT

abstract:
  We compute coefficients of two-derivative terms in the hydrodynamic energy
momentum tensor of a viscous fluid which has an AdS_D dual with D between 3 and
7. For the case of D=3 we obtain an exact AdS_3 black hole solution, valid to
all orders in a derivative expansion, dual to a perfect fluid in 1+1
dimensions.


title:
Effects of different geometries on the conductance, shot noise and
  tunnel magnetoresistance of double quantum dots

abstract:
  The spin-polarized transport through a coherent strongly coupled double
quantum dot (DQD) system is analyzed theoretically in the sequential and
cotunneling regimes. Using the real-time diagrammatic technique, we analyze the
current, differential conductance, shot noise and tunnel magnetoresistance
(TMR) as a function of both the bias and gate voltages for double quantum dots
coupled in series, in parallel as well as for T-shaped systems. For DQDs
coupled in series, we find a strong dependence of the TMR on the number of
electrons occupying the double dot, and super-Poissonian shot noise in the
Coulomb blockade regime. In addition, for asymmetric DQDs, we analyze transport
in the Pauli spin blockade regime and explain the existence of the leakage
current in terms of cotunneling and spin-flip cotunneling-assisted sequential
tunneling. For DQDs coupled in parallel, we show that the transport
characteristics in the weak coupling regime are qualitatively similar to those
of DQDs coupled in series. On the other hand, in the case of T-shaped quantum
dots we predict a large super-Poissonian shot noise and TMR enhanced above the
Julliere value due to increased occupation of the decoupled quantum dot. We
also discuss the possibility of determining the geometry of the double dot from
transport characteristics. Furthermore, where possible, we compare our results
with existing experimental data on nonmagnetic systems and find qualitative
agreement.


title:
Formation epochs, star formation histories and sizes of massive
  early-type galaxies in cluster and field environments at z=1.2: insights from
  the rest-frame UV

abstract:
  We derive stellar masses, ages and star formation histories of massive
early-type galaxies in the z=1.237 RDCS1252.9-2927 cluster and compare them
with those measured in a similarly mass-selected sample of field contemporaries
drawn from the GOODS South Field. Robust estimates of these parameters are
obtained by comparing a large grid of composite stellar population models with
8-9 band photometry in the rest-frame NUV, optical and IR, thus sampling the
entire relevant domain of emission of the different stellar populations.
Additionally, we present new, deep $U$-band photometry of both fields, giving
access to the critical FUV rest-frame, in order to constrain empirically the
dependence on the environment of the most recent star formation processes. We
find that early-type galaxies, both in the cluster and in the field, show
analogous optical morphologies, follow comparable mass vs. size relation, have
congruent average surface stellar mass densities and lie on the same Kormendy
relation. We also that a fraction of early-type galaxies in the field employ
longer timescales, $\tau$, to assemble their mass than their cluster
contemporaries. Hence we conclude that, while the formation epoch of early-type
only depends on their mass, the environment does regulate the timescales of
their star formation histories. Our deep $U$-band imaging strongly supports
this conclusions. It shows that cluster galaxies are at least 0.5 mag fainter
than their field contemporaries of similar mass and optical-to-infrared colors,
implying that the last episode of star formation must have happened more
recently in the field than in the cluster.


title: Colorful quantum black holes at the LHC

abstract:
  We examine the LHC phenomenology of quantum black holes in models of TeV
gravity. By quantum black holes we mean black holes of the smallest masses and
entropies, far from the semiclassical regime. These black holes are formed and
decay over short distances, and typically carry SU(3) color charges inherited
from their parton progenitors. Based on a few minimal assumptions, such as
gauge invariance, we identify interesting signatures for quantum black hole
decay such as 2 jets, jet + hard photon, jet + missing energy and jet + charged
lepton, which should be readily visible above background. The detailed
phenomenology depends heavily on whether one requires a Lorentz invariant,
low-energy effective field theory description of black hole processes.


title: Exoplanet Mapping Revealed

abstract:
  One of the most exciting results of the Spitzer era has been the ability to
construct longitudinal brightness maps from the infrared phase variations of
hot Jupiters. We presented the first such map in Knutson et al. (2007),
described the mapping theory and some important consequences in Cowan & Agol
(2008) and presented the first multi waveband map in Knutson et al. (2008). In
these proceedings, we begin by putting these maps in historical context, then
briefly describe the mapping formalism. We then summarize the differences
between the complementary N-Slice and Sinusoidal models and end with some of
the more important and surprising lessons to be learned from a careful analytic
study of the mapping problem.


title:
Information compressibility, entropy production and approach to steady
  state in open systems

abstract:
  We introduce the concept of {\em information compressibility}, $K_I$, which
measures the relative change of number of available microstates of an open
system in response to an energy variation. We then prove that at the time in
which the system reaches a steady state, the second and third time derivatives
of the information entropy are proportional to the corresponding time
derivatives of the energy, the proportionality constant being $K_I$. We argue
that if two steady states with different but same-sign $K_I$ are dynamically
connected in a non-adiabatic way it takes a longer time to reach the state with
compressibility closer to zero than the reverse. This concept, that applies to
both classical and quantum open systems, thus provides insight into the
properties of non-equilibrium steady states.


title:
Current-driven transformations of the intermediate state patterns in
  type-I superconductors

abstract:
  Dynamic structure of the intermediate state was studied in pinning-free thick
Pb strips using real-time magneto-optical visualization. It is found that
topological hysteresis can be lifted by applying sufficiently large current.
Namely, laminar structure that appears on flux exit in a static case is turned
into tubular when the sufficiently large transport current is present. Size and
distribution of the flux tubes in static and dynamic regimes are different.
Temperature, magnetic field and current phase diagram is discussed.


title: Impulse Formulations of Hall Magnetohydrodynamic Equations

abstract:
  Impulse formulations of Hall magnetohydrodynamic (MHD) equations are
developed. The Lagrange invariance of a generalized ion magnetic helicity is
established for Hall MHD. The physical implications of this Lagrange invariant
are discussed. The discussion is then extended to compressible Hall MHD.
Compressibility effects are shown not to affect, as to be expected, the
physical implications of the generalized ion magnetic helicity Lagrange
invariant.


title: Spitzer's Contribution to the AGN Population

abstract:
  (abridged) Infrared selection is a potentially powerful way to identify
heavily obscured AGN missed in even the deepest X-ray surveys. Using a 24
micron-selected sample in GOODS-S, we test the reliability and completeness of
three infrared AGN selection methods: (1) IRAC color-color selection, (2) IRAC
power-law selection, and (3) IR-excess selection; we also evaluate a number of
infrared excess approaches. We find that the vast majority of non-power-law
IRAC color-selected AGN candidates in GOODS-S have colors consistent with those
of star-forming galaxies. Contamination by star-forming galaxies is most
prevalent at low 24 micron flux densities (~100 uJy) and high redshifts (z~2),
but the fraction of potential contaminants is still high (~50%) at 500 uJy, the
highest flux density probed reliably by our survey. AGN candidates selected via
a simple, physically-motivated power-law criterion (PLGs), however, appear to
be reliable. We confirm that the infrared excess methods successfully identify
a number of AGN, but we also find that such samples may be significantly
contaminated by star-forming galaxies. Adding only the secure Spitzer-selected
PLG, color-selected, IR-excess, and radio/IR-selected AGN candidates to the
deepest X-ray-selected AGN samples directly increases the number of known X-ray
AGN (84) by 54-77%, and implies an increase to the number of 24 micron-detected
AGN of 71-94%. Finally, we show that the fraction of MIR sources dominated by
an AGN decreases with decreasing MIR flux density, but only down to f_24 = 300
uJy. Below this limit, the AGN fraction levels out, indicating that a
non-negligible fraction (~10%) of faint 24 micron sources (the majority of
which are missed in the X-ray) are powered not by star formation, but by the
central engine.


title: The NStED Stellar and Exoplanet Hosting Star Service

abstract:
  The NASA Star and Exoplanet Database (NStED) is a general purpose stellar
archive with the aim of providing support for NASA's planet finding and
characterization goals, stellar astrophysics, and the planning of NASA and
other space missions. There are two principal components of NStED: a database
of (currently) 140,000 nearby stars and exoplanet-hosting stars, and an archive
dedicated to high precision photometric surveys for transiting exoplanets. We
present a summary of the NStED stellar database, functionality, tools, and user
interface. NStED currently serves the following kinds of data for 140,000 stars
(where available): coordinates, multiplicity, proper motion, parallax, spectral
type, multiband photometry, radial velocity, metallicity, chromospheric and
coronal activity index, and rotation velocity/period. Furthermore, the
following derived quantities are given wherever possible: distance, effective
temperature, mass, radius, luminosity, space motions, and physical/angular
dimensions of habitable zone. Queries to NStED can be made using constraints on
any combination of the above parameters. In addition, NStED provides tools to
derive specific inferred quantities for the stars in the database,
cross-referenced with available extra-solar planetary data for those host
stars. NStED can be accessed at http://nsted.ipac.caltech.edu


title: Field-dependent AC susceptibility of itinerant ferromagnets

abstract:
  Whereas dc measurements of magnetic susceptibility, $\chi$, fail to
distinguish between local and weak itinerant ferromagnets, radio-frequency (rf)
measurements of $\chi$ in the ferromagnetic state show dramatic differences
between the two. We present sensitive tunnel-diode resonator measurements of
$\chi$ in the weak itinerant ferromagnet ZrZn$_2$ at a frequency of 23 MHz.
Below Curie temperature, $T_C \approx 26$ K, the susceptibility is seen to
increase and pass through a broad maximum at approximately 15 K in zero applied
dc magnetic field. Application of a magnetic field reduces the amplitude of the
maximum and shifts it to lower temperatures. The existence and evolution this
maximum with applied field is not predicted by either the Stoner or
self-consistent renormalized (SCR) spin fluctuations theories. For temperatures
below $T_C$ both theories derive a zero-field limit expression for $\chi$. We
propose a semi-phenomenological model that considers the effect of the internal
field from the polarized fraction of the conduction band on the remaining,
unpolarized conduction band electrons. The developed model accurate describes
the experimental data.


title:
First $O(\alpha_s^3)$ heavy flavor contributions to deeply inelastic
  scattering

abstract:
  In the asymptotic limit $Q^2 \gg m^2$, the heavy flavor Wilson coefficients
for deep--inelastic scattering factorize into the massless Wilson coefficients
and the universal heavy flavor operator matrix elements resulting from
light--cone expansion. In this way, one can calculate all but the power
corrections in $(m^2/Q^2)^k, k > 0$. The heavy flavor operator matrix elements
are known to ${\sf NLO}$. We present the last 2--loop result missing in the
unpolarized case for the renormalization at 3--loops and first 3--loop results
for terms proportional to the color factor $T_F^2$ in Mellin--space. In this
calculation, the corresponding parts of the ${\sf NNLO}$ anomalous dimensions
\cite{LARIN,MVVandim} are obtained as well.


title: New non-Abelian black hole solutions in Born-Infeld gravity

abstract:
  We introduce new black hole solutions to the Einstein-Yang-Mills-Born-Infeld
(EYMBI), Einstein-Yang-Mills-Born-Infeld-Gauss-Bonnet (EYMBIGB) and
Einstein-Yang-Mills-Born-Infeld-Gauss-Bonnet-Lovelock (EYMBIGBL) gravities in
higher dimensions $N\geq 5$ to investigate the roles of Born-Infeld parameter
$\beta $. It is shown that, these solutions in the limits of $\beta \to 0,$ and
$\beta \to \infty ,$ represent pure gravity and gravity coupled with Yang-Mills
fields, respectively. For $0<\beta <\infty $ it yields a variety of black
holes, supporting even regular ones at $r=0$.


title: Star products made (somewhat) easier

abstract:
  We develop an approach to the deformation quantization on the real plane with
an arbitrary Poisson structure which based on Weyl symmetrically ordered
operator products. By using a polydifferential representation for deformed
coordinates $\hat x^j$ we are able to formulate a simple and effective
iterative procedure which allowed us to calculate the fourth order star product
(and may be extended to the fifth order at the expense of tedious but otherwise
straightforward calculations). Modulo some cohomology issues which we do not
consider here, the method gives an explicit and physics-friendly description of
the star products.


title:
A Molecular Einstein Ring at z=4.12: Imaging the Dynamics of a Quasar
  Host Galaxy Through a Cosmic Lens

abstract:
  We present high-resolution (0.3") Very Large Array (VLA) imaging of the
molecular gas in the host galaxy of the high redshift quasar PSS J2322+1944
(z=4.12). These observations confirm that the molecular gas (CO) in the host
galaxy of this quasar is lensed into a full Einstein ring, and reveal the
internal dynamics of the molecular gas in this system. The ring has a diameter
of ~1.5", and thus is sampled over ~20 resolution elements by our observations.
Through a model-based lens inversion, we recover the velocity gradient of the
molecular reservoir in the quasar host galaxy of PSS J2322+1944. The Einstein
ring lens configuration enables us to zoom in on the emission and to resolve
scales down to ~1 kpc. From the model-reconstructed source, we find that the
molecular gas is distributed on a scale of 5 kpc, and has a total mass of
M(H2)=1.7 x 10^10 M_sun. A basic estimate of the dynamical mass gives M_dyn =
4.4 x 10^10 (sin i)^-2 M_sun, that is, only ~2.5 times the molecular gas mass,
and ~30 times the black hole mass (assuming that the dynamical structure is
highly inclined). The lens configuration also allows us to tie the optical
emission to the molecular gas emission, which suggests that the active galactic
nucleus (AGN) does reside within, but not close to the center of the molecular
reservoir. Together with the (at least partially) disturbed structure of the
CO, this suggests that the system is interacting. Such an interaction, possibly
caused by a major `wet' merger, may be responsible for both feeding the quasar
and fueling the massive starburst of 680 M_sun/yr in this system, in agreement
with recently suggested scenarios of quasar activity and galaxy assembly in the
early universe.


title:
Jets as diagnostics of the circumstellar medium and the explosion
  energetics of supernovae: the case of Cas A

abstract:
  We present hydrodynamical models for the Cassiopeia A (Cas A) supernova
remnant and its observed jet / counter-jet system. We include the evolution of
the progenitor's circumstellar medium, which is shaped by a slow red supergiant
wind that is followed by a fast Wolf-Rayet (WR) wind.
  The main parameters of the simulations are the duration of the WR phase and
the jet energy. We find that the jet is destroyed if the WR phase is
sufficiently long and a massive circumstellar shell has formed. We therefore
conclude that the WR phase must have been short (a few thousand yr), if present
at all. Since the actual jet length of Cas A is not known we derive a lower
limit for the jet energy, which is ~10^{48} erg. We discuss the implications
for the progenitor of Cas A and the nature of its explosion.


title: Luminosity-Metallicity Relation for dIrr Galaxies in the Near-Infrared

abstract:
  (abridged) The present work is a first step to collect homogeneous abundances
and near-infrared (NIR) luminosities for a sample of dwarf irregular (dIrr)
galaxies, located in nearby groups. The use of NIR luminosities is intended to
provide a better proxy to mass than the blue luminosities commonly used in the
literature; in addition, selecting group members reduces the impact of
uncertain distances. Accurate abundances are derived to assess the galaxy
metallicity. Optical spectra are collected for Hii regions in the dIrrs,
allowing the determination of oxygen abundances by means of the
temperature-sensitive method. For each dIrr galaxy H-band imaging is performed
and the total magnitudes are measured via surface photometry. This high-quality
database allows us to build a well-defined luminosity-metallicity relation in
the range -13 >= M(H) >= -20. The scatter around its linear fit is reduced to
0.11 dex, the lowest of all relations currently available. There might exist a
difference between the relation for dIrrs and the relation for giant galaxies,
although a firm conclusion should await direct abundance determinations for a
significant sample of massive galaxies. This new dataset provides an improved
luminosity-metallicity relation, based on a standard NIR band, for dwarf
star-forming galaxies. The relation can now be compared with some confidence to
the predictions of models of galaxy evolution. Exciting follow-ups of this work
are (a) exploring groups with higher densities, (b) exploring nearby galaxy
clusters to probe environmental effects on the luminosity-metallicity relation,
and (c) deriving direct oxygen abundances in the central regions of
star-forming giant galaxies, to settle the question of a possible dichotomy
between the chemical evolution of dwarfs and that of massive galaxies.


title:
An Analogue of the Gallai-Edmonds Structure Theorem for Nonzero Roots of
  the Matching Polynomial

abstract:
  Godsil observed the simple fact that the multiplicity of 0 as a root of the
matching polynomial of a graph coincides with the classical notion of
deficiency. From this fact he asked to what extent classical results in
matching theory generalize, replacing "deficiency" with multiplicity of
$\theta$ as a root of the matching polynomial. We prove an analogue of the
Stability Lemma for any given root, which describes how the matching structure
of a graph changes upon deletion of a single vertex. An analogue of Gallai's
Lemma follows. Together these two results imply an analogue of the
Gallai-Edmonds Structure Theorem. Consequently, the matching polynomial of a
vertex transitive graph has simple roots.


title: Linear perturbations of Hyperkahler metrics

abstract:
  We study general linear perturbations of a class of 4d real-dimensional
hyperkahler manifolds obtainable by the (generalized) Legendre transform
method. Using twistor methods, we show that deformations can be encoded in a
set of holomorphic functions of 2d+1 variables, as opposed to the functions of
d+1 variables controlling the unperturbed metric. Such deformations generically
break all tri-holomorphic isometries of the unperturbed metric. Geometrically,
these functions generate the symplectomorphisms which relate local complex
Darboux coordinate systems in different patches of the twistor space. The
deformed Kahler potential follows from these data by a Penrose-type transform.
As an illustration of our general framework, we determine the leading
exponential deviation of the Atiyah-Hitchin manifold away from its negative
mass Taub-NUT limit. In a companion paper arXiv:0810.1675, we extend these
techniques to quaternionic-Kahler spaces with isometries.


title:
Electron pockets in the Fermi surface of hole-doped high-Tc
  superconductors

abstract:
  High-temperature superconductivity occurs as copper oxides are chemically
tuned to have a carrier concentration intermediate between their metallic state
at high doping and their insulating state at zero doping. The underlying
evolution of the electron system in the absence of superconductivity is still
unclear and a question of central importance is whether it involves any
intermediate phase with broken symmetry. The Fermi surface of underdoped
YBa2Cu3Oy and YBa2Cu4O8 was recently shown to include small pockets in contrast
with the large cylinder characteristic of the overdoped regime1, pointing to a
topological change in the Fermi surface. Here we report the observation of a
negative Hall resistance in the magnetic field-induced normal state of
YBa2Cu3Oy and YBa2Cu4O8, which reveals that these pockets are electron-like. We
propose that electron pockets arise most likely from a reconstruction of the
Fermi surface caused by the onset of a density-wave phase, as is thought to
occur in the electron-doped materials near the onset of antiferromagnetic order
Comparison with materials of the La2CuO4 family that exhibit spin/charge
density-wave order suggests that a Fermi surface reconstruction also occurs in
those materials, pointing to a generic property of high-Tc superconductors.


title:
Internal kinematics of spiral galaxies in distant clusters III. Velocity
  fields from FORS2/MXU spectroscopy

abstract:
  (Abridged) We study the impact of cluster environment on the evolution of
spiral galaxies by examining their structure and kinematics. Rather than
two-dimensional rotation curves, we observe complete velocity fields by placing
three adjacent and parallel FORS2 MXU slits on each object, yielding several
emission and absorption lines. The gas velocity fields are reconstructed and
decomposed into circular rotation and irregular motions using kinemetry. To
quantify irregularities in the gas kinematics, we define three parameters:
sigma_{PA} (standard deviation of the kinematic position angle), Delta phi (the
average misalignment between kinematic and photometric position angles) and
k_{3,5} (squared sum of the higher order Fourier terms). Using local,
undistorted galaxies from SINGS, these can be used to establish the regularity
of the gas velocity fields. Here we present the analysis of 22 distant galaxies
in the MS0451.6-0305 field with 11 members at z=0.54. In this sample we find
both field (4 out of 8) and cluster (3 out of 4) galaxies with velocity fields
that are both irregular and asymmetric. We show that these fractions are
underestimates of the actual number of galaxies with irregular velocity fields.
The values of the (ir)regularity parameters for cluster galaxies are not very
different from those of the field galaxies, implying that there are isolated
field galaxies that are as distorted as the cluster members. None of the
deviations in our small sample correlate with photometric/structural properties
like luminosity or disk scale length in a significant way.
  Our 3D-spectroscopic method successfully maps the velocity field of distant
galaxies, enabling the importance and efficiency of cluster specific
interactions to be assessed quantitatively.


title: Non-perturbative phenomena in semiconductor four-wave mixing spectra

abstract:
  Non-perturbative phenomena in four-wave mixing spectra of semiconductors are
studied using the exact solution of a widely used phenomenological non-linear
equation of motion of the exciton polarization. It is shown that Coulomb
interaction, included in the nonlinearity, leads to two characteristic effects,
which are essentially of dynamical origin, -- a split of the exciton peak and a
non-monotonous dependence of the response at the exciton frequency on the
magnitude of the external field. Relations between the spectral features and
the parameters of the system is obtained. It is found that the transition from
perturbative to non-perturbative regimes is controlled by parameters inversely
proportional to the decay rate. It implies that the condition of low excitation
density does not necessarily warrant applicability of the perturbational
approach.


title:
Transverse spatial and frequency properties of two-photon states
  generated by spontaneous parametric down-conversion

abstract:
  We present a detailed account of the two-photon states generated by SPDC in
both type I and type II phase matching, including the effects of anisotropy of
the nonlinear medium and the frequency spread of the down-converted fields.
Accurate as well as simplified expressions are derived for type I and type II
phase matching in the context of Fourier Optics. The main results are compared
with experimental data available in the literature, showing good agreement in
all cases.


title: Measurements of Phi_1 and Phi_2 by Belle and Babar

abstract:
  We report recent measurements of the Unitarity triangle angles phi_1 and
phi_2 using large data samples collected with Belle and BaBar detectors at e+e-
asymmetric-energy colliders.


title: Realistic Hybrid Inflation in 5D Orbifold SO(10) GUT

abstract:
  We discuss the smooth hybrid inflation scenario in the context of a simple
supersymmetric SO(10) GUT in 5D orbifold. In this GUT model, the SO(10) gauge
symmetry is broken down to the Pati-Salam (PS) gauge group, SU(4)$_c \times$
SU(2)$_L \times$ SU(2)$_R$, by orbifold boundary conditions and all matter and
Higgs multiplets are placed only on the brane (PS brane) where only the PS
symmetry is manifest. Further breaking of the Pati-Salam group to the Standard
Model one is realized by VEVs of the Higgs multiplets $({\bf 4},{\bf 1},{\bf
2}) \oplus (\overline{{\bf 4}},{\bf 1},{\bf 2})$. The gauge coupling
unification is successfully realized at $M_{\rm GUT} =4.6 \times 10^{17}$ GeV
after incorporating the threshold corrections of the Kaluza-Klein modes, with
the compactification scale (assumed to be the same as the PS symmetry breaking
scale) $M_c = v_{\rm PS}= 1.2 \times 10^{16}$ GeV. We show that this orbifold
GUT model can naturally leads us to the smooth hybrid inflation, which tunes
out to be consistent with the WMAP 5-year data with the predicted $M_{\rm GUT}$
and $v_{PS}$ in the model.


title: SP2Bench: A SPARQL Performance Benchmark

abstract:
  Recently, the SPARQL query language for RDF has reached the W3C
recommendation status. In response to this emerging standard, the database
community is currently exploring efficient storage techniques for RDF data and
evaluation strategies for SPARQL queries. A meaningful analysis and comparison
of these approaches necessitates a comprehensive and universal benchmark
platform. To this end, we have developed SP^2Bench, a publicly available,
language-specific SPARQL performance benchmark. SP^2Bench is settled in the
DBLP scenario and comprises both a data generator for creating arbitrarily
large DBLP-like documents and a set of carefully designed benchmark queries.
The generated documents mirror key characteristics and social-world
distributions encountered in the original DBLP data set, while the queries
implement meaningful requests on top of this data, covering a variety of SPARQL
operator constellations and RDF access patterns. As a proof of concept, we
apply SP^2Bench to existing engines and discuss their strengths and weaknesses
that follow immediately from the benchmark results.


title:
Quantum construction of a unitary SU(2/1) model of the electro-weak
  interactions with 2 Higgs doublets

abstract:
  The interactions and even the number of the Higgs scalar fields are not fixed
in the SU(2)U(1) standard model of the electro-weak interactions and the
intrinsically chiral nature of the weak interactions is not explained.
Embedding SU(2)U(1) into the Lie super-algebra SU(2/1) fills these gaps. The 2
smallest representations of SU(2/1) adequately describe the electron, neutrino,
up and down quarks and correlate their chiralities with their U(1) charges, and
the Higgs fields have the quantum numbers of the odd generators. But so far,
there was an apparent conflict with unitarity, because the quark representation
is not Hermitian and the super-Killing metric is not positive definite. We
solve this paradox by assuming the existence of 2 complex Higgs doublets
minimally coupled to the Fermions via the chiral projections of the odd
generators of SU(2/1). We find that Lagrangian induced by the Fermion loops is
unitary, thanks to the balance between the leptons and the quarks needed to
cancel the triangle anomaly and that the super-Jacobi identity guarantees that
the photon remains massless after symmetry breaking. In addition, the
Lagrangian has a classical geometric interpretation in terms of the curvature
of the corresponding Hermitian algebra. Assuming that the relative strength of
the scalar and vector couplings does not depend on the number of families
constrains the mass of the Higgs to $M^2_{H^0_1} + M^2_{H^0_2} = 32/9 M^2_W = 2
(107.2 GeV)^2$. Contrary to grand-unified or Wess-Zumino super-symmetric
models, the SU(2/1) internal super-unification does not predict any unobserved
particle besides the 2 Higgs doublets.


title: Electro Thermal Transport Coefficients at Finite Frequencies

abstract:
  We review a recently developed formalism for computing thermoelectric
coefficients in correlated matter. The usual difficulties of such a calculation
are circumvented by a careful generalization the transport formalism to finite
frequencies, from which one can extract the high frequency objects. The
technical parallel between the Hall constant and the Seebeck coefficient is
explored and used to advantage. For small clusters, exact diagonalization gives
the full spectrum for the Hubbard and especially the $t$-$J$ model, a
prototypical model for strong correlations, and this spectrum can be used to
compute the exact finite frequency transport coefficients and hence to
benchmark various approximations.
  An application of this formalism to the physically important case of sodium
cobaltate $Na_xCoO_2$ is made, and interesting predictions for new materials
are highlighted.


title:
The Influence of Horizontal Boundaries on Ekman Circulation and Angular
  Momentum Transport in a Cylindrical Annulus

abstract:
  We present numerical simulations of circular Couette flow in axisymmetric and
fully three-dimensional geometry of a cylindrical annulus inspired by Princeton
MRI liquid gallium experiment. The incompressible Navier-Stokes equations are
solved with the spectral element code Nek5000 incorporating realistic
horizontal boundary conditions of differentially rotating rings. We investigate
the effect of changing rotation rates (Reynolds number) and of the horizontal
boundary conditions on flow structure, Ekman circulation and associated
transport of angular momentum through the onset of unsteadiness and
three-dimensionality. A mechanism for the explanation of the dependence of the
Ekman flows and circulation on horizontal boundary conditions is proposed.


title: The Heap Lambda Machine

abstract:
  This paper introduces a new machine architecture for evaluating lambda
expressions using the normal-order reduction, which guarantees that every
lambda expression will be evaluated if the expression has its normal form and
the system has enough memory. The architecture considered here operates using
heap memory only. Lambda expressions are represented as graphs, and all
algorithms used in the processing unit of this machine are non-recursive.


title:
Comment on Influence of non-conservative optical forces on the dynamics
  of optically trapped colloidal spheres: The fountain of probability,
  arXiv:0804.0730v1

abstract:
  We demonstrate that the data presented in the manuscript by Y. Roichman et
al. are not sufficient to show that the circulation of a trapped particle
exists in a static optical trap.


title: Quantum Fidelity and Thermal Phase Transitions

abstract:
  We study the quantum fidelity approach to characterize thermal phase
transitions. Specifically, we focus on the mixed-state fidelity induced by a
perturbation in temperature. We consider the behavior of fidelity in two types
of second-order thermal phase transitions (based on the type of non-analiticity
of free energy), and we find that usual fidelity criteria for identifying
critical points is more applicable to the case of $\lambda$ transitions
(divergent second derivatives of free energy). Our study also reveals
limitations of the fidelity approach: sensitivity to high temperature thermal
fluctuations that wash out information about the transition, and inability of
fidelity to distinguish between crossovers and proper phase transitions. In
spite of these limitations, however, we find that fidelity remains a good
pre-criterion for testing thermal phase transitions, which we use to analyze
the non-zero temperature phase diagram of the Lipkin-Meshkov-Glick model.


title: B0-B0bar mixing

abstract:
  The subject of particle-antiparticle mixing in the neutral B meson systems is
reviewed. The formalism of B0-B0bar mixing is recalled and basic Standard Model
predictions are given, before experimental issues are discussed and the latest
combinations of experimental results on mixing parameters are presented,
including those on mixing-induced CP violation, mass differences, and
decay-width differences. Finally, time-integrated mixing results are used to
improve our knowledge on the fractions of the various b-hadron species produced
in Z decays and at high-energy colliders.


title:
Distance to NGC 281 in a Galactic Fragmenting Superbubble: Parallax
  Measurements with VERA

abstract:
  We have used the Japanese VLBI array VERA to perform high-precision
astrometry of an H2O maser source in the Galactic star-forming region NGC 281
West, which has been considered to be part of a 300-pc superbubble. We
successfully detected a trigonometric parallax of 0.355+/-0.030 mas,
corresponding to a source distance of 2.82+/-0.24 kpc. Our direct distance
determination of NGC 281 has resolved the large distance discrepancy between
previous photometric and kinematic studies; likely NGC 281 is in the far side
of the Perseus spiral arm. The source distance as well as the absolute proper
motions were used to demonstrate the 3D structure and expansion of the NGC 281
superbubble, ~650 pc in size parallel to the Galactic disk and with a shape
slightly elongated along the disk or spherical, but not vertically elongated,
indicating the superbubble expansion may be confined to the disk. We estimate
the expansion velocity of the superbubble as ~20 km/s both perpendicular to and
parallel to the Galactic disk with a consistent timescale of ~20 Myr.


title: Variational Theory of Balance Systems

abstract:
  In this work we apply the Poincare-Cartan formalism of the Classical Field
Theory to study the systems of balance equations (balance systems). We
introduce the partial k-jet bundles of the configurational bundle and study
their basic properties: partial Cartan structure, prolongation of vector
fields, etc. A constitutive relation C of a balance system is realized as a
mapping between a (partial) k-jet bundle and the extended dual bundle similar
to the Legendre mapping of the Lagrangian Field Theory. Invariant (variational)
form of the balance system corresponding to a constitutive relation C is
studied. Special cases of balance systems -Lagrangian systems of order 1 with
arbitrary sources and RET (Rational Extended Ther- modynamics) systems are
characterized in geometrical terms. Action of auto- morphisms of the
configurational bundle on the constitutive mappings C is studied and it is
shown that the symmetry group Sym(C) of C acts on the sheaf of solutions Sol(C)
of he balance system. Suitable version of Noether Theorem for an action of a
symmetry group is presented together with the special forms for semi-
Lagrangian and RET balance systems and examples of energy momentum and gauge
symmetries balance laws.


title: Algebraic cycles and motivic iterated integrals II

abstract:
  This is a sequel to our previous paper (joint with Furusho). It will give a
more natural framework for constructing elements in the Hopf algebra of framed
mixed Tate motives according to Bloch and Kriz. This framework allows us to
extend our previous results to interpret all multiple zeta values (including
the divergent ones) and the multiple polylogarithms in one variable as elements
of this Hopf algebra. It implies that the pro-unipotent completion of the
torsor of paths on projective line minus three points, is a mixed Tate motive
in the sense of Bloch-Kriz. Also It allows us to interpret the multiple
logarithm as an element of this Hopf algebra as long as the products of
consecutive arguments are not 1.


title: Spin-dependent scattering in a silicon transistor

abstract:
  The scattering of conduction electrons off neutral donors depends sensitively
on the relative orientation of their spin states. We present a theory of
spin-dependent scattering in the two dimensional electron gas (2DEG) of field
effect transistors. Our theory shows that the scattering mechanism is dominated
by virtual transitions to negatively ionized donor levels. This effect
translates into a source-drain current that always gets reduced when donor
spins are at resonance with a strong microwave field. We propose a model for
donor impurities interacting with conduction electrons in a silicon transistor,
and compare our explicit numerical calculations to electrically detected
magnetic resonance (EDMR) experiments. Remarkably, we show that EDMR is optimal
for donors placed into a sweet spot located at a narrow depth window quite far
from the 2DEG interface. This allows significant optimization of spin signal
intensity for the minimal number of donors placed into the sweet spot, enabling
the development of single spin readout devices. Our theory reveals an
interesting dependence on conduction electron spin polarization p_c. As p_c
increases upon spin injection, the EDMR amplitude first increases as p_{c}^{2},
and then saturates when a polarization threshold p_T is reached. These results
show that it is possible to use EDMR as an in-situ probe of carrier spin
polarization in silicon and other materials with weak spin-orbit coupling.


title: Topological spin-current in non-centrosymmetric superconductors

abstract:
  We study the spin transport properties of the non-centrosymmetric
superconductor with time-reversal-symmetry where spin-triplet $(p_{x} \pm i
p_{y})$-wave and spin-singlet s-wave pair potential can mix each other. We show
that when the amplitude of $(p_{x} \pm ip_{y})$-wave pair potential is larger
than that of s-wave one, the superconducting state belongs to the topologically
nontrivial class analogous to the quantum spin Hall system, and the resulting
helical edge modes as Andreev bound states are topologically protected. We find
that the incident angle dependent spin polarized current flows through the
interface due to the presence of the helical edge modes. With a weak magnetic
field, also the angle-integrated current is strongly spin polarized.


title: Path integral representation of spin foam models of 4d gravity

abstract:
  We give a unified description of all recent spin foam models introduced by
Engle, Livine, Pereira and Rovelli (ELPR) and by Freidel and Krasnov (FK). We
show that the FK models are, for all values of the Immirzi parameter,
equivalent to path integrals of a discrete theory and we provide an explicit
formula for the associated actions. We discuss the relation between the FK and
ELPR models and also study the corresponding boundary states. For general
Immirzi parameter, these are given by Alexandrov's and Livine's SO(4) projected
states. For 0 <= gamma < 1, the states can be restricted to SU(2) spin
networks.


title:
Spatially Resolved Far-Ultraviolet Spectroscopy of the Nuclear Region of
  NGC 1068

abstract:
  We carry out high-resolution FUSE spectroscopy of the nuclear region of NGC
1068. The first set of spectra was obtained with a 30" square aperture that
collects all emission from the narrow-line region. The data reveal a strong
broad OVI component of FWHM ~3500 kms-1 and two narrow OVI 1031/1037 components
of ~350 kms-1. The CIII 977 and NIII 991 emission lines in this spectrum can be
fitted with a narrow component of FWHM ~1000 kms-1 and a broad one of ~2500
kms-1. Another set of seven spatially resolved spectra were made using a long
slit of 1.25" X 20", at steps of ~1" along the axis of the emission-line cone.
We find that (1) Major emission lines in the FUSE wavelength range consist of a
broad and a narrow component; (2) There is a gradient in the velocity field for
the narrow OVI component of ~200 kms-1 from ~2" southwest of the nucleus to ~4"
northeast. A similar pattern is also observed with the broad OVI component,
with a gradient of ~3000 kms-1. These are consistent with the HST/STIS findings
and suggest a biconical structure in which the velocity field is mainly radial
outflow; (3) A major portion of the CIII and NIII line flux is produced in the
compact core. They are therefore not effective temperature diagnostics for the
conical region; and (4) The best-fitted UV continuum suggests virtually no
reddening, and the HeII 1085/1640 ratio suggests a consistently low extinction
factor across the cone.


title:
Predicting Regional Classification of Levantine Ivory Sculptures: A
  Machine Learning Approach

abstract:
  Art historians and archaeologists have long grappled with the regional
classification of ancient Near Eastern ivory carvings. Based on the visual
similarity of sculptures, individuals within these fields have proposed object
assemblages linked to hypothesized regional production centers. Using
quantitative rather than visual methods, we here approach this classification
task by exploiting computational methods from machine learning currently used
with success in a variety of statistical problems in science and engineering.
We first construct a prediction function using 66 categorical features as
inputs and regional style as output. The model assigns regional style group
(RSG), with 98 percent prediction accuracy. We then rank these features by
their mutual information with RSG, quantifying single-feature predictive power.
Using the highest- ranking features in combination with nomographic
visualization, we have found previously unknown relationships that may aid in
the regional classification of these ivories and their interpretation in art
historical context.


title:
Norm one idempotent cb-multipliers with applications to the Fourier
  algebra in the cb-multiplier norm

abstract:
  For a locally compact group $G$, let $A(G)$ be its Fourier algebra, let
$M_{cb}A(G)$ denote the completely bounded multipliers of $A(G)$, and let
$A_{Mcb}(G)$ stand for the closure of $A(G)$ in $M_{cb}A(G)$. We characterize
the norm one idempotents in $M_{cb}A(G)$: the indicator function of a set $E
\subset G$ is a norm one idempotent in $M_{cb}A(G)$ if and only if $E$ is a
coset of an open subgroup of $G$. As applications, we describe the closed
ideals of $A_{Mcb}(G)$ with an approximate identity bounded by 1, and we
characterize those $G$ for which $A_{Mcb}(G)$ is 1-amenable in the sense of B.
E. Johnson. (We can even slightly relax the norm bounds.)


title:
Diffusional Nucleation of Nanocrystals and Their Self-Assembly into
  Uniform Colloids

abstract:
  We review theoretical explanation of mechanisms of control of uniformity in
growth of nanosize particles and colloids. The nanoparticles are synthesized as
nanocrystals, by burst nucleation from solution. The colloids are
self-assembled by aggregation of these nanocrystals. The two kinetic processes
are coupled, and both are driven by diffusional transport. The interrelation of
the two processes allows for formation of narrow-size-distribution colloid
dispersions which are of importance in many applications. We review a
mathematical model of cluster growth by capture of diffusing "singlets." Burst
nucleation of nanoparticles in solution is then analyzed. Finally, we couple it
to the secondary process of aggregation of nanoparticles to form colloids. We
address aspects of modeling of particle size distribution, as well as other
properties.


title: Half-metallic zigzag carbon nanotube dots

abstract:
  A comprehensive first-principles theoretical study of the electronic
properties and half-metallic nature of finite zigzag carbon nanotubes is
presented. Unlike previous reports, we find that all nanotubes studied present
a spin-polarized ground state, where opposite spins are localized at the two
zigzag edges in a long-range antifferomagnetic configuration. Relative
stability analysis of the different spin states indicate that, for the shorter
segments, spin-ordering should be present even at room temperature. The energy
gap between the highest occupied and the lowest unoccupied molecular orbitals
of the finite systems is found to be inversely proportional to the nanotubes
segments length, suggesting a route to control their electronic properties.
Similar to the case of zigzag graphene nanoribbons, half-metallic behavior is
obtained under the influence of an external axial electric field.


title:
An optimum Hamiltonian for non-Hermitian quantum evolution and the
  complex Bloch sphere

abstract:
  For a quantum system governed by a non-Hermitian Hamiltonian, we studied the
problem of obtaining an optimum Hamiltonian that generates nonunitary
transformations of a given initial state into a certain final state in the
smallest time $\tau$. The analysis is based on the relationship between the
states of the two-dimensional subspace of the Hilbert space spanned by the
initial and final states and the points of the two-dimensional complex Bloch
sphere.


title: Top Quark Production from Black Holes at the CERN LHC

abstract:
  LHC is expected to be a top quark factory. If the fundamental Planck scale is
near a TeV, then we also expect the top quarks to be produced from black holes
via Hawking radiation. In this paper we calculate the cross sections for top
quark production from black holes at the LHC and compare it with the direct top
quark cross section via parton fusion processes at next-to-next-to-leading
order (NNLO). We find that the top quark production from black holes can be
larger or smaller than the pQCD predictions at NNLO depending upon the Planck
mass and black hole mass. Hence the observation of very high rates for massive
particle production (top quarks, higgs or supersymmetry) at the LHC may be an
useful signature for black hole production.


title: An Algebraic Approach for the MIMO Control of Small Scale Helicopter

abstract:
  The control of small-scale helicopter is a MIMO problem. To use of classical
control approach to formally solve a MIMO problem, one needs to come up with
multidimensional Root Locus diagram to tune the control parameters. The problem
with the required dimension of the RL diagram for MIMO design has forced the
design procedure of classical approach to be conducted in cascaded multi-loop
SISO system starting from the innermost loop outward. To implement this control
approach for a helicopter, a pitch and roll attitude control system is often
subordinated to a, respectively, longitudinal and lateral velocity control
system in a nested architecture. The requirement for this technique to work is
that the inner attitude control loop must have a higher bandwidth than the
outer velocity control loop which is not the case for high performance mini
helicopter. To address the above problems, an algebraic design approach is
proposed in this work. The designed control using s-CDM approach is
demonstrated for hovering control of small-scale helicopter simultaneously
subjected to plant parameter uncertainties and wind disturbances.


title: Nonlinear Spinors as the Candidate of Dark Matter

abstract:
  In this paper, we discuss the equation of state for nonlinear spinor gases in
the context of cosmology. The mean energy momentum tensor is similar to that of
the prefect fluid, but an additional function of state $W$ is introduced to
describe the nonlinear potential. The equation of state $w(a)\lesssim -1$ in
the early universe is calculated, which provides a natural explanation for the
negative pressure of dark matter and dark energy. $W$ may be also the main
origin of the cosmological constant $\Lambda$. So the nonlinear spinor gases
may be a candidate for dark matter and dark energy.


title: Structural Damage Detection Using Randomized Trained Neural Networks

abstract:
  A computationally method on damage detection problems in structures was
conducted using neural networks. The problem that is considered in this works
consists of estimating the existence, location and extent of stiffness
reduction in structure which is indicated by the changes of the structural
static parameters such as deflection and strain. The neural network was trained
to recognize the behaviour of static parameter of the undamaged structure as
well as of the structure with various possible damage extent and location which
were modelled as random states. The proposed techniques were applied to detect
damage in a simply supported beam. The structure was analyzed using
finite-element-method (FEM) and the damage identification was conducted by a
back-propagation neural network using the change of the structural strain and
displacement. The results showed that using proposed method the strain is more
efficient for identification of damage than the displacement.


title: Charge-transport and tunneling in single-walled carbon nanotubes

abstract:
  We investigate experimentally the transport properties of single-walled
carbon nanotube bundles as a function of temperature and applied current over
broad intervals of these variables. The analysis is performed on arrays of
nanotube bundles whose axes are aligned along the direction of the externally
supplied bias current. The data are found consistent with a charge transport
model governed by the tunnelling between metallic regions occurring through
potential barriers generated by nanotubes contact areas or bundles surfaces.
Based on this model and on experimental data we describe quantitatively the
dependencies of the amplitude of these barriers upon bias current and
temperature.