title:
On the mistake in the implementation of the minimal model of the dual
  parameterization and resulting inability to describe the high-energy DVCS
  data

abstract:
  We correct the mistaken claim made in \cite{Guzey:2005ec,Guzey:2006xi} that
the minimal model of the dual parameterization of nucleon generalized parton
distributions (GPDs) gives a good, essentially model-independent description of
high-energy data on deeply virtual Compton scattering (DVCS). In the
implementation of the dual parameterization in
\cite{Guzey:2005ec,Guzey:2006xi}, the numerical prefactor of two in front of
the DVCS amplitude was missing. We show that the corrected minimal model of the
dual parameterization significantly overestimates the HERA data (H1 and ZEUS)
on the DVCS cross section.


title:
On the Capacity and Diversity-Multiplexing Tradeoff of the Two-Way Relay
  Channel

abstract:
  This paper considers a multiple input multiple output (MIMO) two-way relay
channel, where two nodes want to exchange data with each other using multiple
relays. An iterative algorithm is proposed to achieve the optimal achievable
rate region, when each relay employs an amplify and forward (AF) strategy.
  The iterative algorithm solves a power minimization problem at every step,
subject to minimum signal-to-interference-and-noise ratio constraints, which is
non-convex, however, for which the Karush Kuhn Tuker conditions are sufficient
for optimality. The optimal AF strategy assumes global channel state
information (CSI) at each relay. To simplify the CSI requirements, a simple
amplify and forward strategy, called dual channel matching, is also proposed,
that requires only local channel state information, and whose achievable rate
region is close to that of the optimal AF strategy. In the asymptotic regime of
large number of relays, we show that the achievable rate region of the dual
channel matching and an upper bound differ by only a constant term and
establish the capacity scaling law of the two-way relay channel. Relay
strategies achieving optimal diversity-multiplexing tradeoff are also
considered with a single relay node. A compress and forward strategy is shown
to be optimal for achieving diversity multiplexing tradeoff for the full-duplex
case, in general, and for the half-duplex case in some cases.


title:
Approximation by Lipschitz, C^{p} smooth functions on weakly compactly
  generated Banach spaces

abstract:
  The following result was announced in the earlier version(s) of this paper:
On weakly compactly generated Banach spaces which admit a Lipschitz, C^{p}
smooth bump function, one can uniformly approximate uniformly continuous,
bounded, real-valued functions by Lipschitz, C^{p} smooth functions.
Unfortunately, there is a gap in the proof which renders the proof in its
present form incorrect


title:
Evidence for Blue Straggler Stars Rejuvenating the Integrated Spectra of
  Globular Clusters

abstract:
  Integrated spectroscopy is the method of choice for deriving the ages of
unresolved stellar systems. However, hot stellar evolutionary stages, such as
hot horizontal branch stars and blue straggler stars (BSSs), can affect the
integrated ages measured using Balmer lines. Such hot, "non-canonical" stars
may lead to overestimations of the temperature of the main sequence turn-off,
and therefore underestimations of the integrated age of a stellar population.
Using an optimized Hbeta index in conjunction with HST/WFPC2 color-magnitude
diagrams (CMDs), we show that Galactic globular clusters exhibit a large
scatter in their apparent "spectroscopic" ages, which does not correspond to
that in their CMD-derived ages. We find for the first time that the specific
frequency of BSSs, defined within the same aperture as the integrated spectra,
shows a clear correspondence with Hbeta in the sense that, at fixed
metallicity, higher BSS ratios lead to younger "apparent" spectroscopic ages.
Thus, the specific frequency of BSSs in globular clusters sets a fundamental
limit on the accuracy for which spectroscopic ages can be determined for
globular clusters, and maybe for other stellar systems like galaxies. The
observational implications of this result are discussed.


title:
Measurement of Charged Current Charged Single Pion Production in
  SciBooNE

abstract:
  The SciBooNE experiment is designed to measure neutrino cross sections on
carbon around one GeV region. Charged current single charged pion production is
a dominant background process for $\nu_\mu \to \nu_x$ oscillation experiments
with a few-GeV neutrino beam, and thus a precision measurement of the cross
section is essential. This article reports preliminary results on this process
from SciBooNE.


title: Some universal trends of the Mie(n,m) fluid thermodynamics

abstract:
  By using canonical Monte Carlo simulation, the liquid-vapor phase diagram,
surface tension, interface width, and pressure for the Mie(n,m) model fluids
are calculated for six pairs of parameters $m$ and $n$. It is shown that after
certain re-scaling of fluid density the corresponding states rule can be
applied for the calculations of the thermodynamic properties of the Mie model
fluids, and for some real substances


title:
General Resolvents for Monotone Operators: Characterization and
  Extension

abstract:
  Monotone operators, especially in the form of subdifferential operators, are
of basic importance in optimization. It is well known since Minty, Rockafellar,
and Bertsekas-Eckstein that in Hilbert space, monotone operators can be
understood and analyzed from the alternative viewpoint of firmly nonexpansive
mappings, which were found to be precisely the resolvents of monotone
operators. For example, the proximal mappings in the sense of Moreau are
precisely the resolvents of subdifferential operators. More general notions of
"resolvent", "proximal mapping" and "firmly nonexpansive" have been studied.
One important class, popularized chiefly by Alber and by Kohsaka and Takahashi,
is based on the normalized duality mapping. Furthermore, Censor and Lent
pioneered the use of the gradient of a well behaved convex functions in a
Bregman-distance based framework. It is known that resolvents are firmly
nonexpansive, but the converse has been an open problem for the latter
framework.
  In this note, we build on the very recent characterization of maximal
monotonicity due to Martinez-Legaz to provide a framework for studying
resolvents in which firmly nonexpansive mappings are always resolvents. This
framework includes classical resolvents, resolvents based on the normalized
duality mapping, resolvents based on Bregman distances, and even resolvents
based on (nonsymmetric) rotators. As a by-product of recent work on the
proximal average, we obtain a constructive Kirszbraun-Valentine extension
result for generalized firmly nonexpansive mappings. Several examples
illustrate our results.


title: The Radial Masa in a Free Group Factor is Maximal Injective

abstract:
  The radial (or Laplacian) masa in a free group factor is the abelian von
Neumann algebra generated by the sum of the generators (of the free group) and
their inverses. The main result of this paper is that the radial masa is a
maximal injective von Neumann subalgebra of a free group factor. We also
investigate tensor products of maximal injective algebras. Given two inclusions
$B_i\subset M_i$ of type $\mathrm{I}$ von Neumann algebras in finite von
Neumann algebras such that each $B_i$ is maximal injective in $M_i$, we show
that the tensor product $B_1\ \bar{\otimes}\ B_2$ is maximal injective in $M_1\
\bar{\otimes}\ M_2$ provided at least one of the inclusions satisfies the
asymptotic orthogonality property we establish for the radial masa. In
particular it follows that finite tensor products of generator and radial masas
will be maximal injective in the corresponding tensor product of free group
factors.


title:
A novel approach towards selective bulk synthesis of delaminated
  graphenes in an electric arc

abstract:
  Here we demonstrate the selective bulk scale synthesis of delaminated
graphene sheets by a proper choice of magnetic field modulating an
electric-arc. An ultra-high purity glassy graphite anode was sublimated in an
argon atmosphere. Carbon nanotubes, as well as graphene sheets were found
inside the deposit formed on the cathode. Both the high purity carbon nanotubes
as well as graphene sheets, with minimal structural defects, were synthesized
separately by varying the strength and orientation of the external magnetic
field generated by arrays of permanent magnets. The as-synthesized carbonaceous
samples were characterized with the help of transmission electron microscopy,
selected area electron diffraction, Raman spectroscopy and thermogravimetry for
optimizing the highest selective production of delaminated graphenes. This
optimization was done by varying the strength and orientation of the external
magnetic field.
  The as-synthesized graphene sheets exhibited relatively high degree of
graphitization and low structural defect density as confirmed by RS. They were
found to exhibit higher oxidation temperature than that of the carbon
nanocrystalline particles as inferred from the thermogravimatric analysis.
Moreover, they were found to form scroll-like carbon nanotubes at their edges
on account of their surface energy minimization. This was confirmed by the
selected area electron diffraction analysis. With this new technique, we could
successfully synthesize delaminated graphenes at a rate of few grams per hour.


title: Fingers of God

abstract:
  Very long wavelength universal gravitational waves cannot now produce in
clusters of galaxies velocity dispersions greater than that which these systems
would possess if they were expanding with the Universe, if the Universe is not
younger than $10^{10}$ yr and Hubble's constant is not less than 50 km/sec/
Mpc. A diagram shows that actual velocity dispersions are significantly greater
than this limit.


title:
The Discovery of a Very Faint X-ray Transient in the Globular Cluster
  M15

abstract:
  We have identified an X-ray transient (hereafter M15 X-3) in the globular
cluster M15 from an archival Chandra grating observation. M15 X-3 appears at an
X-ray luminosity of 6*10^{33} ergs/s with a spectrum consistent with an
absorbed power law of photon index 1.51+-0.14. The object is identifiable in
archival Chandra HRC-I observations with an X-ray luminosity of 2-6*10^{31}
ergs/s and apparently soft colors, suggesting a neutron star low-mass X-ray
binary in quiescence. We also observe it in outburst in a 2007 Chandra HRC-I
observation, and in archival 1994-1995 ROSAT HRI observations.
  We identify a likely optical/UV counterpart with a (possibly transient) UV
excess from archival HST data, which suggests a main sequence companion. We
argue that M15 X-3's behavior is similar to that of the very faint X-ray
transients which have been observed in the Galactic Center. We discuss several
explanations for its very low X-ray luminosity, with the assumption that we
have detected its companion. M15 X-3's uniquely low extinction and
well-determined distance make it an excellent target for future studies.


title: The Large-N Limit of PT-Symmetric O(N) Models

abstract:
  We study a $PT$-symmetric quantum mechanical model with an O(N)-symmetric
potential of the form $m^{2}\vec{x}^{2}/2-g(\vec{x}^{2})^{2}/N$ using its
equivalent Hermitian form. Although the corresponding classical model has
finite-energy trajectories that escape to infinity, the spectrum of the quantum
theory is proven to consist only of bound states for all $N$. We show that the
model has two distinct phases in the large-$N$ limit, with different scaling
behaviors as $N$ goes to infinity. The two phases are separated by a
first-order phase transition at a critical value of the dimensionless parameter
$m^{2}/g^{2/3}$, given by $3\cdot2^{1/3}$.


title:
Gravitational Waves detection and spectroscopy with a Double-slit
  Quantum Eraser

abstract:
  We propose the use of heralded photons to detect Gravitational Waves (GWs).
Heralded photons are those photons that, produced during a parametric
downconversion process, are "labelled" by the detection and counting of
coincidences of their correlated or entangled twins and therefore can be
discriminated from the background noise, independently of the type of
correlation/entanglement used in the setup. Without losing any generality, we
illustrate our proposal with a gedankenexperiment, in which the presence of a
gravitational wave causes a relative rotation of the reference frames
associated to the double-slit and the test polarizer, respectively, of a
Walborn's quantum eraser \cite{wal02}. In this thought experiment, the GW is
revealed by the detection of heralded photons in the dark fringes of the
recovered interference pattern by the quantum eraser. Other types of
entanglement, such as momentum-space or energy-time, could be used to obtain
heralded photons to be used in the future with high-frequency GW
interferometric detectors when enough bright sources of correlated photons will
be available.


title:
A structure and energy dissipation efficiency of relativistic
  reconfinement shocks

abstract:
  We present a semi-analytical hydrodynamical model for the structure of
reconfinement shocks formed in astrophysical relativistic jets interacting with
external medium. We take into account exact conservation laws, both across the
shock front and in the zone of the shocked matter, and exact angular relations.
Our results confirm a good accuracy of the approximate formulae derived by
Komissarov & Falle (1997). However, including the transverse pressure gradient
in the shocked jet, we predict an absolute size of the shock to be about about
twice larger. We calculate the efficiency of the kinetic energy dissipation in
the shock and show a strong dependence on both the bulk Lorentz factor and
opening angle of the jet.


title:
Constraints on generating the primordial curvature perturbation and
  non-Gaussianity from instant preheating

abstract:
  We analyse models of inflation in which isocurvature perturbations present
during inflation are converted into the primordial curvature perturbation
during instant preheating. This can be due to an asymmetry between the fields
present either during inflation or during preheating. We consider all the
constraints that the model must satisfy in order to be theoretically valid and
to satisfy observations. We show that the constraints are very tight in all of
the models proposed and special initial conditions are required for the models
to work. In the case where the symmetry is strongly broken during inflation the
non-Gaussianity parameter f_NL is generally large and negative.


title:
Low temperature quasiparticle transport in a d-wave superconductor with
  coexisting charge order

abstract:
  In light of the evidence that charge order coexists with d-wave
superconductivity in the underdoped cuprate superconductors, we investigate the
manner in which such charge order will influence the quasiparticle excitations
of the system and, in particular, the low-temperature transport of heat by
those quasiparticles. We consider a d-wave superconductor in which the
superconductivity coexists with charge density wave order of wave vector
(\pi/a,0). While the nodes of the quasiparticle energy spectrum survive the
onset of charge order, there exists a critical value of the charge density wave
order parameter beyond which the quasiparticle spectrum becomes fully gapped.
We perform a linear response Kubo formula calculation of thermal conductivity
in the low temperature (universal) limit. Results reveal the dependence of
thermal transport on increasing charge order up to the critical value at which
the quasiparticle spectrum becomes fully gapped and thermal conductivity
vanishes. In addition to numerical results, closed-form expressions are
obtained in the clean limit for the special case of isotropic Dirac nodes.
Signatures of the influence of charge order on low-temperature thermal
transport are identified.


title:
Planetary microlensing signals from the orbital motion of the source
  star around the common barycentre

abstract:
  With several detections, the technique of gravitational microlensing has
proven useful for studying planets that orbit stars at Galactic distances, and
it can even be applied to detect planets in neighbouring galaxies. So far,
planet detections by microlensing have been considered to result from a change
in the bending of light and the resulting magnification caused by a planet
around the foreground lens star. However, in complete analogy to the annual
parallax effect caused by the revolution of the Earth around the Sun, the
motion of the source star around the common barycentre with an orbiting planet
can also lead to observable deviations in microlensing light curves that can
provide evidence for the unseen companion. We discuss this effect in some
detail and study the prospects of microlensing observations for revealing
planets through this alternative detection channel. Given that small distances
between lens and source star are favoured, and that the effect becomes nearly
independent of the source distance, planets would remain detectable even if
their host star is located outside the Milky Way with a sufficiently good
photometry (exceeding present-day technology) being possible. From synthetic
light curves arising from a Monte-Carlo simulation, we find that the chances
for such detections are not overwhelming and appear practically limited to the
most massive planets (at least with current observational set-ups), but they
are large enough for leaving the possibility that one or the other signal has
already been observed. However, it may remain undetermined whether the planet
actually orbits the source star or rather the lens star, which leaves us with
an ambiguity not only with respect to its location, but also to its properties.


title: Unparticle actions and gauge invariance

abstract:
  We show that the requirement of gauge invariance is not enough to fix the
form of interactions between unparticles and gauge fields, thus revealing a
wide new class of gauged unparticle actions. Our approach also allows us to
construct operators which create gauge invariant coloured unparticles. We
discuss both their perturbative and non--perturbative properties.


title:
Optical Spectroscopy of X-ray sources in the Extended Chandra Deep Field
  South

abstract:
  We present the first results of our optical spectroscopy program aimed to
provide redshifts and identifications for the X-ray sources in the Extended
Chandra Deep Field South. A total of 339 sources were targeted using the IMACS
spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT.
We measured redshifts for 186 X-ray sources, including archival data and a
literature search. We find that the AGN host galaxies have on average redder
rest-frame optical colors than non-active galaxies, and that they live mostly
in the "green valley". The dependence of the fraction of AGN that are obscured
on both luminosity and redshift is confirmed at high significance and the
observed AGN space density is compared with the expectations from existing
luminosity functions. These AGN show a significant difference in the mid-IR to
X-ray flux ratio for obscured and unobscured AGN, which can be explained by the
effects of dust self-absorption on the former. This difference is larger for
lower luminosity sources, which is consistent with the dust opening angle
depending on AGN luminosity.


title:
Evaluating and Improving Semi-analytic modelling of Dust in Galaxies
  based on Radiative Transfer Calculations

abstract:
  The treatment of dust attenuation is crucial in order to compare the
predictions of galaxy formation models with multiwavelength observations. Most
past studies have either used simple analytic prescriptions or else full
radiative transfer (RT) calculations. Here, we couple star formation histories
and morphologies predicted by the semi-analytic galaxy formation model MORGANA
with RT calculations from the spectrophotometric and dust code GRASIL to create
a library of galaxy SEDs from the UV/optical through the far Infrared, and
compare the predictions of the RT calculations with analytic prescriptions. We
consider a low and high redshift sample, as well as an additional library
constructed with empirical, non-cosmological star formation histories and
simple (pure bulge or disc) morphologies. Based on these libraries, we derive
fitting formulae for the effective dust optical depth as a function of galaxy
physical properties such as metallicity, gas mass, and radius. We show that
such fitting formulae can predict the V-band optical depth with a scatter
smaller than 0.4 dex for both the low and high redshift samples, but that there
is a large galaxy-to-galaxy scatter in the shapes of attenuation curves,
probably due to geometrical variations, which our simple recipe does not
capture well. However, our new recipe provides a better approximation to the
GRASIL results at optical wavelength than standard analytic prescriptions from
the literature, particularly at high redshift.


title: Seeking Sgluons

abstract:
  Scalar gluons -- or sgluons -- are color octet scalars without electroweak
charges. They occur in supersymmetric models of Dirac gauginos as the scalar
partners of the gluino and carry Standard-Model type R charge. This allows them
to interact with ordinary matter and to be produced at the LHC, singly as well
as in pairs. Sgluons dominantly decay into gluons, top pairs, and a top quark
plus a light quark. A pair of sgluons decaying into like-sign tops would
provide a striking signature at the LHC. In our discussion of this channel we
especially focus on the proper treatment of QCD jets.


title:
The cosmological consequence of an obscured AGN population on the
  radiation efficiency

abstract:
  In light of recent indications for a large population of obscured active
galactic nuclei (AGNs), we revisit the mean radiation efficiency from accretion
onto supermassive black holes (SMBHs), epsilon, applying a bayesian approach.
We use the integrated comoving energy density emitted by AGNs and compare it to
the mass density of local SMBHs. When considering only optically-selected
unobscured AGNs, we derive log_10[epsilon]=-1.77+0.16-0.11 or
epsilon=1.7+0.8-0.4%. Using the AGNs selected using hard X-rays, which include
unabsorbed and Compton-thin absorbed AGNs, we find
log_10[epsilon]=-1.20+0.15-0.10 or epsilon=6.4+2.6-1.3%. Using
optically-selected AGNs, and correcting for the obscured population, we inferr
log_10[epsilon]=-1.17+0.11-0.08 or epsilon=6.7+1.9-1.1%, which we consider our
best estimate. We also repeat this calculation for intrinsically luminous AGNs
(M_B<-23, quasars), comparing to the SMBH mass density in local elliptical
galaxies, and find log_10[epsilon]=-1.27+0.15-0.11 or epsilon=5.4+2.2-1.2%. We
discuss how our results can be used to estimate the mean spin of accreting
SMBHs, both assuming the standard thin-disk model of accretion onto black holes
and also comparing to more recent simulations. Our results can rule out
maximally rotating SMBHs (<a>=0.998 Gm_bh/c^2) at the >=98% confidence level,
as well as high rotation values (<a> >=0.9 Gm_bh/c^2) with >=92% confidence.
Our preferred values of <a> are ~0.25-0.60 Gm_bh/c^2, although even these might
be overestimated. Hence, we find that on average, SMBHs are not rapidly
spinning during accretion. Finally, using an independent measurement of
Eddington ratios, we estimate the SMBH e-folding time for the brightest AGNs
(quasars) to be <tau> =100+151-60 Myr.


title: Simplified Models for a First Characterization of New Physics at the LHC

abstract:
  Low-energy SUSY and several other theories that address the hierarchy problem
predict pair-production at the LHC of particles with Standard Model quantum
numbers that decay to jets, missing energy, and possibly leptons. If an excess
of such events is seen in LHC data, a theoretical framework in which to
describe it will be essential to constraining the structure of the new physics.
We propose a basis of four deliberately simplified models, each specified by
only 2-3 masses and 4-5 branching ratios, for use in a first characterization
of data. Fits of these simplified models to the data furnish a quantitative
presentation of the jet structure, electroweak decays, and heavy-flavor content
of the data, independent of detector effects. These fits, together with plots
comparing their predictions to distributions in data, can be used as targets
for describing the data within any full theoretical model.


title: The Pierre Auger Cosmic Ray Observatory, Comments on Recent Results

abstract:
  The Pierre Auger Observatory has been taking data on the highest energy
cosmic rays for the equivalent of over a year of full detector aperture.
Comments are presented on results published so far.


title: Chaotic Microcavity Laser with Low threshold and Unidirectional Output

abstract:
  Here we report lasing action in lima\c{c}on-shaped GaAs microdisks with
quantum dots (QDs) embedded. Although the intracavity ray dynamics is
predominantly chaotic, high-$Q$ modes are concentrated in the region $\chi >
\chi_c$ as a result of wave localization. Strong optical confinement by total
internal reflection leads to very low lasing threshold. Our measurements show
that all the lasing modes have output in the same direction, regardless of
their wavelengths and intracavity mode structures. This universal emission
direction is determined by directed phase space flow of optical rays in the
open chaotic cavity. The divergence angle of output beam is less than 40
degree. The unidirectionality proves to be robust against small deviations of
the real cavity shape and size from the designed values.


title: Inert Doublet Model and LEP II Limits

abstract:
  The inert doublet model is a minimal extension of the standard model
introducing an additional SU(2) doublet with new scalar particles that could be
produced at accelerators. While there exists no LEP II analysis dedicated for
these inert scalars, the absence of a signal within searches for supersymmetric
neutralinos can be used to constrain the inert doublet model. This translation
however requires some care because of the different properties of the inert
scalars and the neutralinos. We investigate what restrictions an existing
DELPHI collaboration study of neutralino pair production can put on the inert
scalars and discuss the result in connection with dark matter. We find that
although an important part of the inert doublet model parameter space can be
excluded by the LEP II data, the lightest inert particle still constitutes a
valid dark matter candidate.


title:
Twirling of actin by myosins II and V observed via polarized TIRF in a
  modified gliding assay

abstract:
  The force generated between actin and myosin acts predominantly along the
direction of the actin filament, resulting in relative sliding of the thick and
thin filaments in muscle or transport of myosin cargos along actin tracks.
Previous studies have also detected lateral forces or torques that are
generated between actin and myosin, but the origin and biological role of these
sideways forces is not known. Here we adapt an actin gliding filament assay in
order to measure the rotation of an actin filament about its axis (twirling) as
it is translocated by myosin. We quantify the rotation by determining the
orientation of sparsely incorporated rhodamine-labeled actin monomers, using
polarized total internal reflection (polTIRF) microscopy. In order to determine
the handedness of the filament rotation, linear incident polarizations in
between the standard s- and p-polarizations were generated, decreasing the
ambiguity of our probe orientation measurement four-fold. We found that whole
myosin II and myosin V both twirl actin with a relatively long (micron),
left-handed pitch that is insensitive to myosin concentration, filament length
and filament velocity.


title: Metric properties of higher-dimensional Thompson's groups

abstract:
  Higher-dimensional Thompson's groups nV are finitely presented groups
described by Brin which generalize dyadic self-maps of the unit interval to
dyadic self-maps of n-dimensional unit cubes. We describe some of the metric
properties of higher-dimensional Thompson's groups. We give descriptions of
elements based upon tree-pair diagrams and give upper and lower bounds for word
length in terms of the size of the diagrams. Though these upper and lower
bounds are somewhat separated, we show that there are elements realizing the
lower bounds and that the fraction of elements which are close to the upper
bound converges to 1, showing that the bounds are optimal and that the upper
bound is generically achieved.


title:
Two-Qubit Separabilities as Piecewise Continuous Functions of Maximal
  Concurrence. II--The Relevance of Dyson Indices

abstract:
  We importantly amend a certain parenthetical remark made in Part I
(arXiv:0806.3294), to the effect that although two-qubit
diagonal-entry-parameterized separability functions had been shown
(arXiv:0704.3723) to clearly conform to a pattern dictated by the "Dyson
indices" (beta = 1 [real], 2 [complex], 4 [quaternionic]) of random matrix
theory, this did not appear to be the case with regard to
eigenvalue-parameterized separability functions (ESFs). But upon further
examination of the extensive numerical analyses reported in Part I, we find
quite convincing evidence that adherence to the Dyson-index pattern does also
hold for ESFs, at least as regards the upper half-range 1/2 <= C <= 1 of the
maximal concurrence over spectral orbits, C. To be specific, it strongly
appears that in this upper half-range, the real two-qubit ESF is simply
proportional to (2-2 C)^(3/2), and its complex counterpart--in conformity to
the Dyson-index pattern--proportional to the square of the real ESF, that is,
(2-2 C)^3. The previously documented piecewise continuous ("semilinear")
behavior in the lower half-range still appears, however, to lack any particular
Dyson-index-related interpretation.


title:
Nuclear quadrupole resonances in compact vapor cells: the crossover from
  the NMR to the NQR interaction regimes

abstract:
  We present the first experimental study that maps the transformation of
nuclear quadrupole resonances from the pure nuclear quadrupole regime to the
quadrupole-perturbed Zeeman regime. The transformation presents an interesting
quantum-mechanical problem, since the quantization axis changes from being
aligned along the axis of the electric-field gradient tensor to being aligned
along the magnetic field. We achieve large nuclear quadrupole shifts for I =
3/2 131-Xe by using a 1 mm^3 cubic cell with walls of different materials. When
the magnetic and quadrupolar interactions are of comparable size, perturbation
theory is not suitable for calculating the transition energies. Rather than use
perturbation theory, we compare our data to theoretical calculations using a
Liouvillian approach and find excellent agreement.


title: Highlights of multi-wavelengths surveys in the Zone of Avoidance

abstract:
  Rather than giving a complete overview on extragalactic Zone of Avoidance
research, this paper will highlight some recent discoveries in the ZOA, such as
new NIR to FIR observations (IRSF, Spitzer) of the most massive disk galaxy
found to-date (HIZOA 0836-43), and deep multi-wavelength observations of a
spiral galaxy WKK 6167 undergoing transformation while infalling along the
Great Attractor Wall into the Norma cluster - reminiscent of similar incidences
observed in two galaxies at higher redshifts (z ~ 0.2). While the recent
systematic multi-wavelengths approaches to uncover the large-scale structure of
galaxies across the ZOA have proven quite successful, in particular in the
Great Attractor region, they lack the required depth to answer open questions
with regard to our understanding of the dynamics in the Local Universe. The
actual mass distribution is poorly understood and does not satisfactorily
explain the observed peculiar velocity fields and the CMB dipole. We will
present future HI survey strategies to be pursued with the South African SKA
Pathfinder MeerKAT in the ZOA, that can - amongst others - resolve the
long-standing Great Attractor/Shapley controversy, and determine at which
distance range the cumulative peculiar motion of the Local Group flattens off
and the Universe becomes homogeneous.


title: Is there a standard measuring rod in the Universe?

abstract:
  The Caltech-Jodrell Bank very long baseline interferometry (VLBI) Surveys
give detailed 5 GHz VLBI images of several hundred milliarcsecond (mas) radio
sources, and the full width at half-maximum angular sizes of the corresponding
compact cores. Using the latter, I have constructed an
angular-diameter/redshift diagram comprising 271 objects, which shows clearly
the expected features of such a diagram, without redshift binning. Cosmological
parameters are derived which are compatible with existing concensus values,
particularly when the VLBI data are combined with recent Baryon Accoustic
Oscillations observations; the figures are presented as indications of what
might be expected of larger samples of similar data. The importance of beaming
and relativistic motion towards the observer is stressed; a model of the latter
indicates that the emitting material is close to the observer's line of sight
and moving with a velocity which brings it close to the observer's rest frame.
With respect to linear size, these objects compare well in variance with type
Ia supernovae; the efficacy of the latter is improved by the brighter-slower
and brighter-bluer correlations, and by the inverse-square law.


title: Measuring Distance Ratios with CMB-Galaxy Lensing Cross-correlations

abstract:
  We propose a method for cosmographic measurements by combining gravitational
lensing of the cosmic microwave background (CMB) with cosmic shear surveys. We
cross-correlate the galaxy counts in the lens plane with two different source
planes: the CMB at $z \sim 1100$ and galaxies at an intermediate redshift. The
ratio of the galaxy count/CMB lensing cross-correlation to the galaxy
count/galaxy lensing cross correlation is shown to be a purely geometric
quantity, depending only on the distribution function of the source galaxies.
By combining Planck, ADEPT and LSST the ratio can be measured to $\sim 4%$
accuracy, whereas a future polarization based experiment like CMBPOL can make a
more precise ($\sim 1%$) measurement. For cosmological models where the
curvature and the equation of state parameter are allowed to vary, the
direction of degeneracy defined by the measurement of this ratio is different
from that traced out by Baryon Acoustic Oscillation (BAO) measurements.
Combining this method with the stacked cluster mass reconstruction cosmography
technique as proposed by Hu, Holz and Vale (2007), the uncertainty in the ratio
can be further reduced, improving the constraints on cosmological parameters.
We also study the implications of the lensing-ratio measurement for early dark
energy models, in context of the parameterization proposed by Doran and Robbers
(2006). For models which are degenerate with respect to the CMB, we find both
BAO and lensing-ratio measurements to be insensitive to the early component of
the dark energy density.


title: Nucleation, Growth, and Coarsening -- A Global View on Aggregation

abstract:
  We present a new model of homogeneous aggregation that contains the essential
physical ideas of the classical predecessors, the Becker-Doring and
Lifshitz-Slyovoz models. These classical models, which give different
predictions, are asymptotic limits of the new model at small and large cluster
sizes (respectively). Since the new theory is valid for large and small
clusters, it allows for a complete description of the nucleation process;
predicting the Zeldovich nucleation rate, and the diffusion limited growth of
large clusters. By retaining the physically valid ingredients from both models,
we can explain the seeming incompatibilities and arbitrary choices of the
classical models.
  We solve the equations of our new model asymptotically in the small
super-saturation limit. The solution exhibits three successive `eras':
nucleation, growth, and coarsening, each with its specific scales of time and
cluster size. During the nucleation era, the bulk of the clusters are formed by
favorable fluctuations over a free energy barrier, according to the analysis by
Zeldovich. During the Growth era no new clusters are created, and the expansion
of the existing ones continues. Eventually the coarsening era begins. During
this competitive attrition process, smaller clusters dissolve and fuel the
further growth of the larger survivors. By resolving the preceding creation and
growth eras, our analysis gives explicitly the characteristic time and cluster
size of the coarsening era, and a unique selection of the long time,
self-similar cluster size distribution.


title: The ANTARES underwater neutrino telescope

abstract:
  ANTARES is the first undersea neutrino telescope. It is in its complete
configuration since May 2008 at about 2.5 km below the sea surface close to
Marseille. Data from 12 lines are being analyzed and are producing first
results. Here we discuss first analysis results for 5 lines and 10 lines, and
we also comment on the performance of the full detector. We show that the
detector has capabilities for discriminating upgoing neutrino events from the
much larger amount of downgoing atmospheric muons and that data and simulation
are in good agreement. We then discuss the physics reach of the detector for
what concerns point-like source and dark matter searches.


title:
Enhanced lensing rate by clustering of massive galaxies: newly
  discovered systems in the SLACS fields

abstract:
  [Abridged] We exploit the clustering of massive galaxies to perform a high
efficiency imaging search for gravitational lenses. Our dataset comprises 44
fields imaged by the Hubble Space Telescope (HST) Advanced Camera for Surveys
(ACS), each of which is centered on a lens discovered by the Strong Lens ACS
Survey (SLACS). We compare four different search methods: 1) automated
detection with the HST Archive Galaxy-scale Gravitational Lens Survey (HAGGLeS)
robot, 2) examining cutout images of bright galaxies (BGs) after subtraction of
a smooth galaxy light distribution, 3) examining the unsubtracted BG cutouts,
and 4) performing a full-frame visual inspection of the ACS images. We compute
purity and completeness and consider investigator time for the four algorithms,
using the main SLACS lenses as a testbed. The first and second algorithms
perform the best. We present the four new lens systems discovered during this
comprehensive search, as well as one other likely candidate. For each new lens
we use the fundamental plane to estimate the lens velocity dispersion and
predict, from the resulting lens geometry, the redshifts of the lensed sources.
Two of these new systems are found in galaxy clusters, which include the SLACS
lenses in the two respective fields. Overall we find that the enhanced lens
abundance (30^{+24}_{-8} lenses/degree^2) is higher than expected for random
fields (12^{+4}_{-2} lenses/degree^2 for the COSMOS survey). Additionally, we
find that the gravitational lenses we detect are qualitatively different from
those in the parent SLACS sample: this imaging survey is largely probing
higher-redshift, and lower-mass, early-type galaxies.


title:
Modeling Spatial and Temporal Dependencies of User Mobility in Wireless
  Mobile Networks

abstract:
  Realistic mobility models are fundamental to evaluate the performance of
protocols in mobile ad hoc networks. Unfortunately, there are no mobility
models that capture the non-homogeneous behaviors in both space and time
commonly found in reality, while at the same time being easy to use and
analyze. Motivated by this, we propose a time-variant community mobility model,
referred to as the TVC model, which realistically captures spatial and temporal
correlations. We devise the communities that lead to skewed location visiting
preferences, and time periods that allow us to model time dependent behaviors
and periodic re-appearances of nodes at specific locations.
  To demonstrate the power and flexibility of the TVC model, we use it to
generate synthetic traces that match the characteristics of a number of
qualitatively different mobility traces, including wireless LAN traces,
vehicular mobility traces, and human encounter traces. More importantly, we
show that, despite the high level of realism achieved, our TVC model is still
theoretically tractable. To establish this, we derive a number of important
quantities related to protocol performance, such as the average node degree,
the hitting time, and the meeting time, and provide examples of how to utilize
this theory to guide design decisions in routing protocols.


title: Direct Distance Measurement to the Dusty White Dwarf GD 362

abstract:
  We present trigonometric parallax observations of GD 362 obtained over seven
epochs using the MDM 2.4m Hiltner Telescope. The existence of a dust disk
around this possibly massive white dwarf makes it an interesting target for
parallax observations. The measured parallax for GD 362 places it at a distance
of 50.6 pc, which implies that its radius and mass are ~ 0.0106 Rsun and 0.71
Msun, respectively. GD 362 is not as massive as initially thought (1.2Msun).
Our results are entirely consistent with the distance and mass estimates (52.2
pc and 0.73 Msun) by Zuckerman et al., who demonstrated that GD 362 has a
helium dominated atmosphere. Dropping GD 362 from the list of massive white
dwarfs, there are no white dwarfs with M > 0.9 Msun that are known to host
circumstellar dust disks.


title: Experimental Neutrino Physics

abstract:
  It's been a remarkable decade in neutrino physics. Ten years ago this summer,
at the 1998 neutrino conference in Takayama, the Super-Kamiokande collaboration
reported the observation of neutrinos changing flavor, thereby establishing the
existence of neutrino mass. A few years later, the SNO experiment solved the
long-standing solar neutrino problem demonstrating that it too was due to
neutrino oscillation. Just a few years after that, these effects were confirmed
and the oscillation parameters were measured with man-made neutrino sources.
Now, just in this last year, the same neutrinos which were the source of the 30
year old solar neutrino problem were measured for the first time in a real-time
experiment.
  In this talk, I will explain how a set of experiments, especially ones in the
last few years, have established a consistent framework of neutrino physics and
also explain some outstanding questions. Finally, I will cover how a set of
upcoming experiments hope to address these questions in the coming decade.


title: Magnetism of chromia

abstract:
  The electronic structure and magnetism of chromia (corundum-type Cr2O3) are
studied using full-potential first-principles calculations. The electronic
correlations are included within the LSDA+U method. The energies of different
magnetic configurations are very well fitted by the Heisenberg Hamiltonian with
strong exchange interaction with two nearest neighbors and additional weak
interaction up to the fifth neighbor shell. These energies are insensitive to
the position of the oxygen states, indicating that magnetism in Cr2O3 is
dominated by direct exchange. The Neel temperature is calculated using the
pair-cluster approximation for localized quantum spins of magnitude 3/2. Very
good agreement with experiment is found for all properties including the
equilibrium volume, spectral density, local magnetic moment, band gap, and the
Neel temperature for the values of U and J that are close to those obtained
within the constrained occupation method. The band gap is of the Mott-Hubbard
type.


title: Few-nucleon studies at intermediate energies

abstract:
  Observables in proton-deuteron scattering are sensitive probes of the
nucleon-nucleon interaction and three-nucleon force effects. Several
facilities, including the KVI, allow a detailed study of few-nucleon
interactions below the pion-production threshold exploiting polarized proton
and deuteron beams. In this contribution, some recent results are discussed and
interpreted exploiting rigorous Faddeev calculations. Furthermore, an
experimental inconsistencies between two measurements of the cross section in
elastic proton-deuteron scattering at 135 MeV/nucleon is reviewed.


title:
Report on "Geometry and representation theory of tensors for computer
  science, statistics and other areas."

abstract:
  This is a technical report on the proceedings of the workshop held July 21 to
July 25, 2008 at the American Institute of Mathematics, Palo Alto, California,
organized by Joseph Landsberg, Lek-Heng Lim, Jason Morton, and Jerzy Weyman. We
include a list of open problems coming from applications in 4 different areas:
signal processing, the Mulmuley-Sohoni approach to P vs. NP, matchgates and
holographic algorithms, and entanglement and quantum information theory. We
emphasize the interactions between geometry and representation theory and these
applied areas.


title:
Phonon Control of Magnetic Relaxation in the Pyrochlore Slab Compounds
  SCGO and BSZCGO

abstract:
  We are interested in the phonon response in the frustrated magnets
SrCr$_{9x}$Ga$_{12-9x}$O$_{19}$ (SCGO) and
Ba$_{2}$Sn$_{2}$ZnCr$_{7x}$Ga$_{10-7x}$O$_{22}$ (BSZCGO). The motivation of the
study is the recently discovered, phonon-driven, magnetic relaxation in the
SCGO compound [Mutka et al. PRL {\bf 97} 047203 (2006)] pointing out the
importance of a low-energy ($\hbar\omega\sim$7 meV) phonon mode. In neutron
scattering experiments on these compounds the phonon signal is partly masked by
the magnetic signal from the Cr moments and we have therefore examined in
detail the non-magnetic isostructural counterparts SrGa$_{12}$O$_{19}$ (SGO)
and Ba$_{2}$Sn$_{2}$ZnGa$_{10}$O$_{22}$ (BSZGO). Our {\it ab-initio} lattice
dynamics calculations on SGO reveal a peak in the vibrational density of states
matching with the neutron observations on SGO and SCGO. A strong contribution
in the vibrational density of states comes from the partial contribution of the
Ga atoms on the 2b and 12k sites, involving modes at the M--point of the
hexagonal system. These modes comprise dynamics of the kagom\'e planes of the
pyrochlore slab magnetic sub-lattice, 12k sites, and therefore can drive
magnetic relaxation via spin-phonon coupling. Both BSZCGO and BSZGO show a
similar low-energy Raman peak but no corresponding peak in the neutron
determined density of states of BSZGO is seen. However, a strong non-Debye
enhancement of low-energy phonon response is observed. We attribute this
particular feature to the Zn/Ga disorder on the 2$d$ -site, already evoked
earlier to affect the magnetic properties of BSZCGO. We propose that this
disorder-induced phonon response explains the absence of a characteristic
energy scale and the much faster magnetic relaxation observed in BSZCGO.


title: Standard Model tests with trapped radioactive atoms

abstract:
  We review the use of laser cooling and trapping for Standard Model tests,
focusing on trapping of radioactive isotopes. Experiments with neutral atoms
trapped with modern laser cooling techniques are testing several basic
predictions of electroweak unification. For nuclear $\beta$ decay, demonstrated
trap techniques include neutrino momentum measurements from beta-recoil
coincidences, along with methods to produce highly polarized samples. These
techniques have set the best general constraints on non-Standard Model scalar
interactions in the first generation of particles. They also have the promise
to test whether parity symmetry is maximally violated, to search for tensor
interactions, and to search for new sources of time reversal violation. There
are also possibilites for exotic particle searches. Measurements of the
strength of the weak neutral current can be assisted by precision atomic
experiments using traps of small numbers of radioactive atoms, and sensitivity
to possible time-reversal violating electric dipole moments can be improved.


title:
NEAR-IR Spectroscopy of Young Stars in the Braid Nebula Star Formation
  Region in Cygnus Ob7

abstract:
  We present 1.4 to 2.5 um integral field spectroscopy of 16 stars in the Braid
Nebula star formation region in Cygnus OB7. These data forms one aspect of a
large-scale multi-wavelength survey aimed at determining an unbiased estimate
of the number, mass distribution, and evolutionary state of the young stars
within this one square degree area of the previously poorly studied Lynds 1003
molecular cloud. Our new spectroscopic data, when combined with 2MASS near-IR
photometry, provide evidence of membership of many of these objects in the
regions pre-main sequence population. We discuss both the characteristics of
the young stars found in the region and the level of star forming activity
present.


title: V1647 ORIONIS: Keck/Nirspec 2 MICRON Echelle Observations

abstract:
  We present new Keck II NIRSPEC high-spectral resolution 2 um echelle
observations of the young eruptive variable star V1647 Orionis. This star went
into outburst in late 2003 and faded to its pre-outburst brightness after
approximately 26 months. V1647 Orionis is the illuminating star of McNeil's
Nebula and is located near M 78 in the Lynds 1630 dark cloud. Our spectra have
a resolving power of approximately 18,000 and allow us to study in detail the
weak absorption features present on the strong near-IR veiled continuum. An
analysis of the echelle orders containing Mg I (2.1066 um) and Al I (2.1099
um), Br-gamma (2.1661 um), the Na I doublet (2.206 and 2.209 um), and the CO
overtone bandhead (2.2935 um) gives us considerable information on the physical
and geometric characteristics of the regions producing these spectral features.
We find that, at high-spectral resolution, V1647 Orionis in quiescence
resembles a significant number of FU Orionis type eruptive variables and does
not appear similar to the quiescent EX Lupi variables observed. This
correspondence is discussed and implications for the evolutionary state of the
star are considered.


title: Spatially Resolved Stellar Populations of Eight GOODS-South AGN at z~1

abstract:
  We present a pilot study of the stellar populations of 8 AGN hosts at z~1 and
compare to (1) lower redshift samples and (2) a sample of nonactive galaxies of
similar redshift. We utilize K' images in the GOODS South field obtained with
the laser guide star adaptive optics (LGSAO) system at Keck Observatory. We
combine this K' data with B, V, i, and z imaging from the ACS on HST to give
multi-color photometry at a matched spatial resolution better than 100 mas in
all bands. The hosts harbor AGN as inferred from their high X-ray luminosities
(L_X > 10^42 ergs/s) or mid-IR colors. We find a correlation between the
presence of younger stellar populations and the strength of the AGN, as
measured with [OIII] line luminosity or X-ray (2-10 keV) luminosity. This
finding is consistent with similar studies at lower redshift. Of the three Type
II galaxies, two are disk galaxies and one is of irregular type, while in the
Type I sample there only one disk-like source and four sources with smooth,
elliptical/spheroidal morphologies. In addition, the mid-IR SEDs of the strong
Type II AGN indicate that they are excited to LIRG (Luminous InfraRed Galaxy)
status via galactic starbursting, while the strong Type I AGN are excited to
LIRG status via hot dust surrounding the central AGN. This supports the notion
that the obscured nature of Type II AGN at z~1 is connected with global
starbursting and that they may be extincted by kpc-scale dusty features that
are byproducts of this starbursting.


title: Multistage Hypothesis Tests for the Mean of a Normal Distribution

abstract:
  In this paper, we have developed new multistage tests which guarantee
prescribed level of power and are more efficient than previous tests in terms
of average sampling number and the number of sampling operations. Without
truncation, the maximum sampling numbers of our testing plans are absolutely
bounded. Based on geometrical arguments, we have derived extremely tight bounds
for the operating characteristic function. To reduce the computational
complexity for the relevant integrals, we propose adaptive scanning algorithms
which are not only useful for present hypothesis testing problem but also for
other problem areas.


title: Matroid polytopes and their volumes

abstract:
  We express the matroid polytope $P_M$ of a matroid $M$ as a signed Minkowski
sum of simplices, and obtain a formula for the volume of $P_M$. This gives a
combinatorial expression for the degree of an arbitrary torus orbit closure in
the Grassmannian $Gr_{k,n}$. We then derive analogous results for the
independent set polytope and the associated flag matroid polytope of $M$. Our
proofs are based on a natural extension of Postnikov's theory of generalized
permutohedra.


title: Signals of New Physics in the Underlying Event

abstract:
  LHC searches for new physics focus on combinations of hard physics objects.
In this work we propose a qualitatively different soft signal for new physics
at the LHC - the "anomalous underlying event". Every hard LHC event will be
accompanied by a soft underlying event due to QCD and pile-up effects. Though
it is often used for QCD and monte carlo studies, here we propose the
incorporation of an underlying event analysis in some searches for new physics.
An excess of anomalous underlying events may be a smoking-gun signal for
particular new physics scenarios such as "quirks" or "hidden valleys" in which
large amounts of energy may be emitted by a large multiplicity of soft
particles. We discuss possible search strategies for such soft diffuse signals
in the tracking system and calorimetry of the LHC experiments. We present a
detailed study of the calorimetric signal in a concrete example, a simple quirk
model motivated by folded supersymmetry. In these models the production and
radiative decay of highly excited quirk bound states leads to an "antenna
pattern" of soft unclustered energy. Using a dedicated simulation of a toy
detector and a "CMB-like" multipole analysis we compare the signal to the
expected backgrounds.


title:
Beyond Cahn-Hilliard-Cook: Early time behavior of symmetry breaking
  phase transition kinetics

abstract:
  We extend the early time ordering theory of Cahn, Hilliard, and Cook
  (CHC) so that our generalized theory applies to solid-to-solid transitions.
Our theory involves spatial symmetry breaking (the initial phase contains a
symmetry not present in the final phase). The predictions of our generalization
differ from those of the CHC theory in two important ways: exponential growth
does not begin immediately following the quench, and the objects that grow
exponentially are not necessarily Fourier modes. Our theory is consistent with
simulation results for the long-range antiferromagnetic Ising model.


title:
Study on X-ray Spectra of Obscured AGNs based on Monte Carlo simulation
  - an interpretation of observed wide-band spectra

abstract:
  Monte Carlo simulation is one of the best tools to study the complex spectra
of Compton-thick AGNs and to figure out the relation between their nuclear
structures and X-ray spectra. We have simulated X-ray spectra of Compton-thick
AGNs obscured by an accretion torus whose structure is characterized by a
half-opening angle, an inclination angle of the torus relative to the observer,
and a column density along the equatorial plane. We divided the simulated
spectra into three components: one direct component, an absorbed reflection
component and an unabsorbed reflection component. We then deduced the
dependencies of these components on the parameters describing the structure of
the torus. Our simulation results were applied to fit the wide-band spectrum of
the Seyfert 2 galaxy Mrk 3 obtained by $Suzaku$. The spectral analysis
indicates that we observe the nucleus along a line of sight intercepting the
torus near its edge, and the column density along the equatorial plane was
estimated to be ~10^24 cm^-2. Using this model, we can estimate the
luminosities of both the direct emission and the emission irradiating the
surrounding matter. This is useful to find the time variability and time lag
between the direct and reflected light.


title: One more ingredient for energy loss quantification

abstract:
  The recent results at RHIC for direct $\gamma$-charged hadron azimuthal
correlations in heavy-ion collisions are presented. We use these correlations
to study the color charge density of the medium through the medium-induced
modification of high-p$_T$ parton fragmentation. Azimuthal correlations of
direct photons at high transverse energy (8 $<$ E$_T$ $<$ 16 GeV) with
away-side charged hadrons of transverse momentum (3 $<$ p$_T$ $<$ 6 GeV/c) have
been measured over a broad range of centrality for $Au+Au$ collisions and $p+p$
collisions at $\sqrt{s_{NN}}$ = 200 GeV in the STAR experiment. A transverse
shower shape analysis in the STAR Barrel Electromagnetic Calorimeter Shower
Maximum Detector is used to discriminate between the direct photons and photons
from the decays of high-p$_T$ $\pi^{0}$. The per-trigger away-side yield of
direct $\gamma$ is smaller than from $\pi^{0}$ triggers in the same centrality
class. Within the current uncertainty the recoil suppression in central $Au+Au$
collisions I$_{CP}$ of direct $\gamma$ and $\pi^{0}$ are similar.


title: Continuous kinematic wave models of merging traffic flow

abstract:
  Merging junctions are important network bottlenecks, and a better
understanding of merging traffic dynamics has both theoretical and practical
implications. In this paper, we present continuous kinematic wave models of
merging traffic flow which are consistent with discrete Cell Transmission
Models with various distribution schemes. In particular, we develop a
systematic approach to constructing kinematic wave solutions to the Riemann
problem of merging traffic flow in supply-demand space. In the new framework,
Riemann solutions on a link consist of an interior state and a stationary
state, subject to admissible conditions such that there are no positive and
negative kinematic waves on the upstream and downstream links respectively. In
addition, various distribution schemes in Cell Transmission Models are
considered entropy conditions. In the proposed analytical framework, we prove
that the stationary states and boundary fluxes exist and are unique for the
Riemann problem for both fair and constant distribution schemes. We also
discuss two types of invariant merge models, in which local and discrete
boundary fluxes are the same as global and continuous ones. With numerical
examples, we demonstrate the validity of the analytical solutions of interior
states, stationary states, and corresponding kinematic waves. Discussions and
future studies are presented in the conclusion section.


title:
Magnetism Localization in Spin-Polarized One-Dimensional
  Anderson-Hubbard Model

abstract:
  In order to study an interplay of disorder, correlation, and spin imbalance
on antiferromagnetism, we systematically explore the ground state of
one-dimensional spin-imbalanced Anderson-Hubbard model by using the
density-matrix renormalization group method. We find that disorders localize
the antiferromagnetic spin density wave induced by imbalanced fermions and the
increase of the disorder magnitude shrinks the areas of the localized
antiferromagnetized regions. Moreover, the antiferromagnetism finally
disappears above a large disorder. These behaviors are observable in atomic
Fermi gases loaded on optical lattices and disordered strongly-correlated
chains under magnetic field.


title:
Stability of the (two-loop) Renormalization Group Flow for Nonlinear
  Sigma Models

abstract:
  We prove the stability of the torus, and with suitable rescaling, hyperbolic
space under the (two-loop) renormalization group flow for the nonlinear sigma
model. To prove stability we use similar techniques to \cite{GIK02}, where the
stability of the torus under Ricci flow was first established. The main
technical tool is maximal regularity theory.


title: Monte Carlo Simulations for the Slow Relaxations of Crumpled Surfaces

abstract:
  In this paper we study crumpled surfaces through Monte Carlo Simulations. The
crumpled surface is represented by a cluster of spins pointing up and spins
pointing down represent the air both inside and around the surface. We follow
the time dynamics of this fractal structure and we have shown that it presents
a stretched exponential behaviour.


title:
Dichotomy for the Hausdorff dimension of the set of nonergodic
  directions

abstract:
  We consider billiards in a (1/2)-by-1 rectangle with a barrier midway along a
vertical side. Let NE be the set of directions theta such that the flow in
direction theta is not ergodic. We show that the Hausdorff dimension of the set
NE is either 0 or 1/2, with the latter occurring if and only if the length of
the barrier satisfies the condition of P'erez Marco, i.e. the sum of (loglog
q_{k+1})/q_k is finite, where q_k is the the denominator of the kth convergent
of the length of the barrier.


title: Orbit equivalence for Cantor minimal Z^d-systems

abstract:
  We show that every minimal action of any finitely generated abelian group on
the Cantor set is (topologically) orbit equivalent to an AF relation. As a
consequence, this extends the classification up to orbit equivalence of minimal
dynamical systems on the Cantor set to include AF relations and Z^d-actions.


title:
Spati-temporal distribution of cascade particles below the maximum of
  EAS development with E>=10**17eV

abstract:
  Signal from scintillation detectors in showers with energies 10**17-10**20eV
has been analyzed. It was determined, that for core distances >=200m the time
scale of a particle arrival time at the detector constitutes 40-5000ns and
longer. Events with fine structure of the signal have been observed. The pulse
consists of several peaks (for vertical showers) and a single pulse (for
inclined showers). There are some anomalous events with two pulses wherein such
a pulse shape is presented in two, three and more detectors. A period between
these pulses makes 60-350ns.


title: On injectivity of quasiregular mappings

abstract:
  We give sufficient conditions for a planar quasiregular mapping to be
injective in terms of the range of the differential matrix.


title:
Conformal maps in periodic flows and in suppression of stretch-twist and
  fold on Riemannian manifolds

abstract:
  Examples of conformal dynamo maps have been presented earlier [Phys Plasmas
\textbf{14}(2007)] where fast dynamos in twisted magnetic flux tubes in
Riemannian manifolds were obtained. This paper shows that conformal maps, under
the Floquet condition, leads to coincidence between exponential stretching or
Lyapunov exponent, conformal factor of fast dynamos. Unfolding conformal dynamo
maps can be obtained in Riemann-flat manifolds since here, Riemann curvature
plays the role of folding. Previously, Oseledts [Geophys Astrophys Fluid Dyn
\textbf{73} (1993)] has shown that the number of twisted and untwisting orbits
in a two torus on a compact Riemannian manifold induces a growth of fast dynamo
action. In this paper, the stretching of conformal thin magnetic flux tubes is
constrained to vanish, in order to obtain the conformal factor for
non-stretching non-dynamos. Since thin flux tube can be considered as a twisted
or untwisting two-torus map, it is shown that the untwisting, weakly torsion,
and non-stretching conformal torus map cannot support a fast dynamo action, a
marginal dynamo being obtained. This is an example of an anti-fast dynamo
theorem besides the ones given by Vishik and Klapper and Young [Comm Math Phys
\textbf{173}(1996)] in ideally high conductive flow. From the Riemann curvature
tensor it is shown that new conformal non-dynamo, is actually singular as one
approaches the magnetic flux tube axis. Thus conformal map suppresses the
stretching directions and twist, leading to the absence of fast dynamo action
while Riemann-flat unfolding manifolds favors non-fast dynamos.


title: Weak Hadronic decays of Charmed Baryons and Current-Algebra Scheme

abstract:
  The weak decay of charmed baryons multiplets into ground state and mesons are
investigated using current algebra technique. Some of the interesting results
on the partial decays rates and the asymmetry parameters for
$\Delta$C=$\Delta$S=-1 the mode are calculated and consequences discussed


title:
The Physical Properties and Effective Temperature Scale of O-type Stars
  as a Function of Metallicity. III. More Results from the Magellanic Clouds

abstract:
  In order to better determine the physical properties of hot, massive stars as
a function of metallicity, we obtained very high SNR optical spectra of 26 O
and early B stars in the Magellanic Clouds. These allow accurate modeling even
in cases where the He I 4471 line has an equivalent width of only a few tens of
mA. The spectra were modeled with FASTWIND, with good fits obtained for 18
stars; the remainder show signatures of being binaries. We include stars in
common to recent studies to investigate possible systematic differences. The
"automatic" FASTWIND modeling method of Mokiem and collaborators produced
temperatures 1100 K hotter on the average, presumably due to the different
emphasis given to various temperature-sensitive lines. More significant,
however, is that the automatic method always produced some "best" answer, even
for stars we identify as composite (binaries). The temperatures found by the
TLUSTY/CMFGEN modeling of Bouret, Heap, and collaborators yielded temperatures
1000 K cooler than ours, on average. Significant outliers were due either to
real differences in the data (some of the Bouret/Heap data were contaminated by
moonlight continua) or the fact we could detect the HeI line needed to better
constrain the temperature. Our new data agrees well with the effective
temperature scale we presented previously. We confirm that the "Of"
emission-lines do not track luminosity classes in the exact same manner as in
Milky Way stars. We revisit the the issue of the "mass discrepancy", finding
that some of the stars in our sample do have spectroscopic masses that are
significantly smaller than those derived from stellar evolutionary models. We
do not find that the size of the mass discrepancy is simply related to either
effective temperature or surface gravity.


title: A trick: why \hat\gamma < \gamma (=3) in [1=arXiv:cond-mat/0106096]?

abstract:
  In this paper, first a theorem on the partial sum of a particular series is
given. Then, based on it, the origin of obvious simulation deviation from
theory is explained: i) why the numerically estimated \hat\gamma (degree
exponent) in [1=arXiv:cond-mat/0106096] is always smaller than \gamma (=3) that
is predicted by theory; ii) and why \hat\gamma rises monotonically as m (the
links added at each step in Barabasi-Albert (BA) model [1]) increases.
Strictly, it declares such errors are basically from the inconsistence of
simulation with the theoretical model, which is caused by an additional
incompatible condition used in simulation. In addition, noticing the evolving
differences between the initial m_0 nodes and those after, we correct the
derived BA model which unfairly omitted such differences.


title: Messaging with Cost Optimized Interstellar Beacons

abstract:
  This paper considers galactic scale Beacons from the point of view of expense
to a builder on Earth. For fixed power density in the far field, what is the
cost-optimum interstellar Beacon system? Experience shows an optimum tradeoff,
depending on transmission frequency and on antenna size and power. This emerges
by minimizing the cost of producing a desired effective isotropic radiated
power, which in turn determines the maximum range of detectability of a
transmitted signal. We derive general relations for cost-optimal aperture and
power. For linear dependence of capital cost on transmitter power and antenna
area, minimum capital cost occurs when the cost is equally divided between
antenna gain and radiated power. For non-linear power law dependence a similar
simple division occurs. This is validated in cost data for many systems;
industry uses this cost optimum as a rule-of-thumb. Costs of pulsed
cost-efficient transmitters are estimated from these relations using current
cost parameters ($/W, $/m2) as a basis. Galactic-scale Beacons demand effective
isotropic radiated power >1017 W, emitted powers are >1 GW, with antenna areas
> km2. We show the scaling and give examples of such Beacons. Thrifty beacon
systems would be large and costly, have narrow searchlight beams and short
dwell times when the Beacon would be seen by an alien oberver at target areas
in the sky. They may revisit an area infrequently and will likely transmit at
higher microwave frequencies, ~10 GHz. The natural corridor to broadcast is
along the galactic spiral radius or along the spiral galactic arm we are in.
Our second paper argues that nearly all SETI searches to date had little chance
of seeing such Beacons.


title: Superparticle Sum Rules in the presence of Hidden Sector Dynamics

abstract:
  We derive sum rules among scalar masses for various boundary conditions of
the hidden-visible couplings in the presence of hidden sector dynamics and show
that they still can be useful probes of the MSSM and beyond.


title: Searching for Cost Optimized Interstellar Beacons

abstract:
  What would SETI Beacon transmitters be like if built by civilizations with a
variety of motivations, but who cared about cost? We studied in a companion
paper how, for fixed power density in the far field, we could build a
cost-optimum interstellar Beacon system. Here we consider, if someone like us
were to produce a Beacon, how should we look for it? High-power transmitters
might be built for wide variety of motives other than twoway communication;
Beacons built to be seen over thousands of light years are such. Altruistic
Beacon builders will have to contend with other altruistic causes, just as
humans do, so may select for economy of effort. Cost, spectral lines near 1 GHz
and interstellar scintillation favor radiating frequencies substantially above
the classic water hole. Therefore the transmission strategy for a distant,
cost-conscious Beacon will be a rapid scan of the galactic plane, to cover the
angular space. Such pulses will be infrequent events for the receiver. Such
Beacons built by distant advanced, wealthy societies will have very different
characteristics from what SETI researchers seek. Future searches should pay
special attention to areas along the galactic disk where SETI searches have
seen coherent signals that have not recurred on the limited listening time
intervals we have used. We will need to wait for recurring events that may
arrive in intermittent bursts. Several new SETI search strategies emerge from
these ideas. We propose a new test for SETI Beacons, based on the Life Plane
hypotheses.


title: Hyperbolic structures on closed spacelike manifolds

abstract:
  In this paper, we study the intrinsic mean curvature flow on certain closed
spacelike manifolds, and prove the existence of hyperbolic structures on them.


title:
Chirality dependent frequency shift of radial breathing mode in metallic
  carbon nanotubes

abstract:
  A phonon frequency shift of the radial breathing mode for metallic single
wall carbon nanotubes is predicted as a function of Fermi energy. Armchair
nanotubes do not show any frequency shift while zigzag nanotubes exhibit phonon
softening, but this softening is not associated with the broadening. This
chirality dependence originates from a curvature-induced energy gap and a
special electron-phonon coupling mechanism for radial breathing modes. Because
of the particle-hole symmetry, only the off-site deformation potential
contributes to the frequency shift. On the other hand, the on-site potential
contributes to the Raman intensity, and the radial breathing mode intensity is
stronger than that of the $G$ band. The relationship between the chirality
dependence of the frequency shift of the radial breathing mode and the $\Gamma$
point optical phonon frequency shift is discussed.


title: Cofiniteness and coassociated primes of local cohomology modules

abstract:
  Let $R$ be a noetherian ring, $\fa$ an ideal of $R$ such that $\dim R/\fa=1$
and $M$ a finite $R$--module. We will study cofiniteness and some other
properties of the local cohomology modules $\lc^{i}_{\fa}(M)$. For an arbitrary
ideal $\fa$ and an $R$--module $M$ (not necessarily finite), we will
characterize $\fa$--cofinite artinian local cohomology modules. Certain sets of
coassociated primes of top local cohomology modules over local rings are
characterized.


title: Superconductivity from D3/D7: Holographic Pion Superfluid

abstract:
  We show that a D3/D7 system (at zero quark mass limit) at finite isospin
chemical potential goes through a superconductor (superfluid) like phase
transition. This is similar to a flavored superfluid phase studied in QCD
literature, where mesonic operators condensate. We have studied the frequency
dependent conductivity of the condensate and found a delta function pole in the
zero frequency limit. This is an example of superconductivity in a string
theory context. Consequently we have found a superfluid/supercurrent type
solution and studied the associated phase diagram. The superconducting
transition changes from second order to first order at a critical superfluid
velocity. We have studied various properties of the superconducting system like
superfluid density, energy gap, second sound etc. We investigate the
possibility of the isospin chemical potential modifying the embedding of the
flavor branes by checking whether the transverse scalars also condense at low
temperature. This however does not seem to be the case.


title:
A QSO plus host system lensed into a 6" Einstein ring by a low redshift
  galaxy

abstract:
  We report the serendipitous discovery of an "Einstein Ring" in the optical
band from the Sloan Digital Sky Survey (SDSS) data and associated four images
of a background source. The lens galaxy appears to be a nearby dwarf spheroid
at a redshift of 0.0375$\pm$0.002. The lensed quasar is at a redshift of
0.6842$\pm$0.0014 and its multiple images are distributed almost 360$^{o}$
around the lens nearly along a ring of radius $\sim$6."0. Single component lens
models require a mass of the galaxy of almost 10$^{12}$ M$_{\odot}$ within 6".0
from the lens center. With the available data we are unable to determine the
exact positions, orientations and fluxes of the quasar and the galaxy, though
there appears evidence for a double or multiple merging image of the quasar. We
have also detected strong radio and X-ray emissions from this system. It is
indicative that this ring system may be embedded in a group or cluster of
galaxies. This unique ring, by virtue of the closeness of the lens galaxy,
offers possible probe to some of the key issues like mass-to-light ratio of
intrinsically faint galaxies, existence of large scale magnetic fields in
elliptical galaxies etc.


title: A History of Solar Activity over Millennia

abstract:
  Presented here is a review of present knowledge of the long-term behavior of
solar activity on a multi-millennial timescale, as reconstructed using the
indirect proxy method. The concept of solar activity is discussed along with an
overview of the special indices used to quantify different aspects of variable
solar activity, with special emphasis upon sunspot number. Over long
timescales, quantitative information about past solar activity can only be
obtained using a method based upon indirect proxies, such as the cosmogenic
isotopes \super{14}C and \super{10}Be in natural stratified archives (e.g.,
tree rings or ice cores). We give an historical overview of the development of
the proxy-based method for past solar-activity reconstruction over millennia,
as well as a description of the modern state. Special attention is paid to the
verification and cross-calibration of reconstructions. It is argued that this
method of cosmogenic isotopes makes a solid basis for studies of solar
variability in the past on a long timescale (centuries to millennia) during the
Holocene. A separate section is devoted to reconstructions of strong solar
energetic-particle (SEP) events in the past, that suggest that the present-day
average SEP flux is broadly consistent with estimates on longer timescales, and
that the occurrence of extra-strong events is unlikely. Finally, the main
features of the long-term evolution of solar magnetic activity, including the
statistics of grand minima and maxima occurrence, are summarized and their
possible implications, especially for solar/stellar dynamo theory, are
discussed.


title:
Chiral symmetry and spectral properties of the Dirac operator in G2
  Yang-Mills Theory

abstract:
  We study spontaneous chiral symmetry breaking and the spectral properties of
the staggered lattice Dirac operator using quenched gauge configurations for
the exceptional group G2, which has a trivial center. In particular we study
the system below and above the finite temperature transition and use the
temporal boundary conditions of the fermions to probe the system. We evaluate
several observables: The spectral density at the origin, the spectral gap, the
chiral condensate and the recently proposed dual chiral condensate. We show
that chiral symmetry is broken at low temperatures and is restored at high
temperatures at the thermodynamic phase transition. Concerning the role of the
boundary conditions we establish that in all respects the spectral quantities
behave for G2 in exactly the same way as for SU(N), when for the latter group
the gauge ensemble above T_c is restricted to the sector of configurations with
real Polyakov loop.


title: Chromospheric Anemone Jets as Evidence of Ubiquitous Reconnection

abstract:
  The heating of the solar chromosphere and corona is a long-standing puzzle in
solar physics. Hinode observations show the ubiquitous presence of
chromospheric anemone jets outside sunspots in active regions. They are
typically 3 to 7 arc seconds = 2000 to 5000 kilometers long and 0.2 to 0.4 arc
second = 150 to 300 kilometers wide, and their velocity is 10 to 20 kilometers
per second. These small jets have an inverted Y-shape, similar to the shape of
x-ray anemone jets in the corona. These features imply that magnetic
reconnection similar to that in the corona is occurring at a much smaller
spatial scale throughout the chromosphere and suggest that the heating of the
solar chromosphere and corona may be related to small-scale ubiquitous
reconnection.


title: Generalization of the model of conflict between two armed groups

abstract:
  The conflicts between armed groups often go on for years. The classical model
of such conflicts accounts for the number of participants and for the
technology level of the equipment of the groups. Below we extend this model in
order to account for events that are present for limited time. As examples we
discuss three kinds of such events: inclusion of reserves, presence of
epidemics and use of non-conventional weapons. We show that if such events are
not handled properly by the leaders of the groups the corresponding group can
lose the conflict.


title: Delta-baryon electromagnetic form factors in lattice QCD

abstract:
  We develop techniques to calculate the four Delta electromagnetic form
factors using lattice QCD, with particular emphasis on the sub-dominant
electric quadrupole form factor that probes deformation of the Delta. Results
are presented for pion masses down to approximately 350 MeV for three cases:
quenched QCD, two flavors of dynamical Wilson quarks, and three flavors of
quarks described by a mixed action combining domain wall valence quarks and
dynamical staggered sea quarks. The magnetic moment of the Delta is chirally
extrapolated to the physical point and the Delta charge density distributions
are discussed.


title:
Design of Cooperative Processes in a Customer-Supplier Relationship: An
  Approach Based on Simulation and Decision Theory

abstract:
  Performance improvement in supply chains, taking into account customer demand
in the tactical planning process is essential. It is more and more difficult
for the customers to ensure a certain level of demand over a medium term
horizon as their own customers ask them for personalisation and fast
adaptation. It is thus necessary to develop methods and decision support
systems to reconcile the order and book processes. In this context, this paper
intends firstly to relate decision under uncertainty and the industrial point
of view based on the notion of risk management. This serves as a basis for the
definition of an approach based on simulation and decision theory that is
dedicated to the design of cooperative processes in a customer-supplier
relationship. This approach includes the evaluation, in terms of risk, of
different cooperative processes using a simulation-dedicated tool. The
evaluation process is based on an exploitation of decision theory concepts and
methods. The implementation of the approach is illustrated on an academic
example typical of the aeronautics supply chain.


title: Marginal likelihood for parallel series

abstract:
  Suppose that $k$ series, all having the same autocorrelation function, are
observed in parallel at $n$ points in time or space. From a single series of
moderate length, the autocorrelation parameter $\beta$ can be estimated with
limited accuracy, so we aim to increase the information by formulating a
suitable model for the joint distribution of all series. Three Gaussian models
of increasing complexity are considered, two of which assume that the series
are independent. This paper studies the rate at which the information for
$\beta$ accumulates as $k$ increases, possibly even beyond $n$. The profile log
likelihood for the model with $k(k+1)/2$ covariance parameters behaves
anomalously in two respects. On the one hand, it is a log likelihood, so the
derivatives satisfy the Bartlett identities. On the other hand, the Fisher
information for $\beta$ increases to a maximum at $k=n/2$, decreasing to zero
for $k\ge n$. In any parametric statistical model, one expects the Fisher
information to increase with additional data; decreasing Fisher information is
an anomaly demanding an explanation.


title:
Double-Layer Potentials for a Generalized Bi-Axially Symmetric Helmholtz
  Equation

abstract:
  The double-layer potential plays an important r$\hat{\rm o}$le in solving
boundary value problems of elliptic equations. Here, in this paper, we aim at
introducing and investigating double layer potentials for a generalized
bi-axially symmetric Helmholtz equation. By using some properties of one of
Appell's hypergeometric functions in two variables, we prove limiting theorems
and derive integral equations concerning a denseness of double-layer
potentials.


title:
Competition between electronic cooling and Andreev dissipation in a
  superconducting micro-cooler

abstract:
  We discuss very low temperature experiments on superconducting micro-coolers
made of a double Normal metal - Insulator - Superconductor junction. We
investigate with a high resolution the differential conductance of the
micro-cooler as well as of additional probe junctions. There is an explicit
crossover between the single quasi-particle current and the phase-coherent
Andreev current. We establish a thermal model by considering the thermal
contribution due to the Andreev current. The related increase of the electron
temperature is discussed, including the influence of several parameters like
the phase-coherence length or the tunnel junction transparency.


title:
Involutions of Iwahori-Hecke algebras and representations of fixed
  subalgebras

abstract:
  We establish branching rules between some Iwahori-Hecke algebra of type B and
their subalgebras which are defined as fixed subalgebras by involutions
including Goldman involution. The Iwahori-Hecke algebra of type D is one of
such fixed subalgebras. We also obtain branching rules between those fixed
subalgebras and their intersection subalgebra. We determine basic sets of
irreducible representations of those fixed subalgebras and their intersection
subalgebra by making use of generalized Clifford theory.


title:
A novel method for the determination of hadron excited states in Lattice
  QCD applied to the nucleon

abstract:
  A novel method for the precise identification and determination of the
energies that contribute in the spectral decomposition of lattice correlators
is presented. The method is based on statistical concepts and it relies heavily
on simulation techniques.
  The $\eta_c$ correlator is analyzed within this method and the results
obtained are compared to a previous analysis based on Bayesian statistics.
  An analysis of the nucleon local two-point correlators leads to the
identification of the excited states in the positive and negative channels. A
discussion on the Roper is included.


title: Statistics of spikes trains, synaptic plasticity and Gibbs distributions

abstract:
  We introduce a mathematical framework where the statistics of spikes trains,
produced by neural networks evolving under synaptic plasticity, can be
analysed.

categories: nlin.AO cond-mat.stat-mech math-ph math.MP nlin.CD q-bio.NC


title:
Scalar susceptibility from the instanton vacuum with meson-loop
  corrections

abstract:
  The scalar susceptibility (chi_s) of QCD, which represents the response of
the chiral condensate to a small perturbation of explicit chiral-symmetry
breaking, is investigated within the nonlocal chiral quark model (NLchiQM)
based on the instanton vacuum configuration for N_f = 2. We also take into
account 1/N_c meson-loop (ML) corrections including scalar and pseudoscalar
mesons. It turns out that the chiral condensate is modified to a large extend
by the ML corrections in the vicinity of m = 0, whereas its effect becomes weak
beyond m ~ 100 MeV. As numerical results, we find that chi_s = -0.34 GeV^2 with
the ML corrections and 0.18 GeV^2 without it, respectively. From these
observations, we conclude that the ML corrections play an important role in the
presence of finite current-quark mass.


title: The central limit theorem under random truncation

abstract:
  Under left truncation, data $(X_i,Y_i)$ are observed only when $Y_i\le X_i$.
Usually, the distribution function $F$ of the $X_i$ is the target of interest.
In this paper, we study linear functionals $\int\varphi \mathrm{d}F_n$ of the
nonparametric maximum likelihood estimator (MLE) of $F$, the Lynden-Bell
estimator $F_n$. A useful representation of $\int \varphi \mathrm{d}F_n$ is
derived which yields asymptotic normality under optimal moment conditions on
the score function $\varphi$. No continuity assumption on $F$ is required. As a
by-product, we obtain the distributional convergence of the Lynden-Bell
empirical process on the whole real line.


title:
A New Interpretation of Two-Photon Entangled Experiments via Quantum
  Mirrors

abstract:
  In this paper the coherence and crossing symmetry of the electromagnetic
interaction of photons involved in the spontaneous parametric down conversion
(SPDC) phenomena in nonlinear crystals, are investigated. On this basis a new
interpretation of the recent results on the two photon entangled experiment is
obtained. A new field of applications is suggested.


title:
Existence of weak solutions for a non-classical sharp interface model
  for a two-phase flow of viscous, incompressible fluids

abstract:
  We introduce a new sharp interface model for the flow of two immiscible,
viscous, incompressible fluids. In contrast to classical models for two-phase
flows we prescribe an evolution law for the interfaces that takes diffusional
effects into account. This leads to a coupled system of Navier-Stokes and
Mullins-Sekerka type parts that coincides with the asymptotic limit of a
diffuse interface model. We prove the long-time existence of weak solutions,
which is an open problem for the classical two-phase model. We show that the
phase interfaces have in almost all points a generalized mean curvature.


title: Photometric investigation of bright type II-P Supernova 2004dj

abstract:
  CCD UBVRI photometry is presented for type II SN 2004dj for about 1200 days,
starting day 2 past discovery. The photometric behaviour is typical for SNe
II-P, although some minor peculiarities are noticed. We compare the photometric
data for the host cluster S96 before and after SN 2004dj outburst and do not
find any significant changes.


title: Defect-related photoluminescence of hexagonal boron nitride

abstract:
  Photoluminescence of polycrystalline hexagonal boron nitride (hBN) was
measured by means of time- and energy-resolved spectroscopy methods. The
observed bands are related to DAP transitions, impurities and structural
defects. The excitation of samples by high-energy photons above 5.4 eV enables
a phenomenon of photostimulated luminescence (PSL), which is due to distantly
trapped CB electrons and VB holes. These trapped charges are metastable and
their reexcitation with low-energy photons results in anti-Stockes
photoluminescence. The comparison of photoluminescence excitation spectra and
PSL excitation spectra allows band analysis that supports the hypothesis of
Frenkel-like exciton in hBN with a large binding energy.


title: To which extend is the "neural code" a metric ?

abstract:
  Here is proposed a review of the different choices to structure spike trains,
using deterministic metrics. Temporal constraints observed in biological or
computational spike trains are first taken into account. The relation with
existing neural codes (rate coding, rank coding, phase coding, ..) is then
discussed. To which extend the "neural code" contained in spike trains is
related to a metric appears to be a key point, a generalization of the
Victor-Purpura metric family being proposed for temporal constrained causal
spike trains

categories: physics.bio-ph cs.NE physics.data-an q-bio.NC


title: A pair of leading spiral arms in a luminous infrared galaxy?

abstract:
  Leading spiral arms are a rare phenomenon. We present here one of the very
few convincing candidates of spiral arms opening counter-intuitively in the
same direction as the galaxy disk is rotating. This detection in a luminous IR
galaxy (LIRG) IRAS 18293-3134 is based on near infrared (NIR) adaptive optics
imaging with the Very Large Telescope and long-slit NIR spectroscopy with the
Anglo-Australian Telescope. We discuss the orientation of the galaxy based on
imaging and derive rotation curves from both emission and absorption features
in the spectrum. The galaxy is strongly star-forming and has a minor companion
in a high-velocity encounter. The fact that the arms of IRAS 18293-3134 are not
easily traceable from optical images suggests that larger samples of
high-quality NIR imaging of interacting systems and LIRGs might uncover further
cases of leading arms, placing constraints on spiral arm theories and
retrograde encounters, and especially on the relationship between disk masses
and dark matter halo masses.


title:
Introducing numerical bounds to improve event-based neural network
  simulation

abstract:
  Although the spike-trains in neural networks are mainly constrained by the
neural dynamics itself, global temporal constraints (refractoriness, time
precision, propagation delays, ..) are also to be taken into account. These
constraints are revisited in this paper in order to use them in event-based
simulation paradigms.
  We first review these constraints, and discuss their consequences at the
simulation level, showing how event-based simulation of time-constrained
networks can be simplified in this context: the underlying data-structures are
strongly simplified, while event-based and clock-based mechanisms can be easily
mixed. These ideas are applied to punctual conductance-based generalized
integrate-and-fire neural networks simulation, while spike-response model
simulations are also revisited within this framework.
  As an outcome, a fast minimal complementary alternative with respect to
existing simulation event-based methods, with the possibility to simulate
interesting neuron models is implemented and experimented.


title:
Correlation energy of intrashell doubly excited states of heliumlike
  atoms

abstract:
  The analysis of correlation energy of the simplest first approximation of a
variational method for the intrashell states of two-electron atoms is the
purpose of the present work. This method allows to divide energy of atom on
Coulomb and additional not - Coulomb correlation parts with very high accuracy.
Thus all the Coulomb interaction completely is taken into account in
calculation and not-Coulomb terms enter only in additional correlation energy.
The general formula for energy of additional correlation interaction is
obtained and the constant of this interaction is determined. The algorithm of
calculation of total energy of two-electron atoms is offered. The outcomes of
calculations for intra-shell states are adduced and compared to the
experimental data . The arguments for the capability of existence of the
analytical solution for a three-body problem in atomic physics are presented.
Some reasons about probable practical consequences are presented. Most
interesting of them is the discovery that under certain conditions additional
electron-electron attraction can exceed classical electron-electron repulsion.


title:
Sizing of Hall effect thrusters with input power and thrust level: An
  Empirical Approach

abstract:
  Sizing methods can be used to get a first estimate of the required Hall
thruster dimensions and operating conditions for a given input power and a
corresponding thrust level. After a review of the existing methods, a new
approach, which considers the three characteristic thruster dimensions, i.e.
the channel length, the channel width and the channel mean diameter as well as
the magnetic field, is introduced. This approach is based on analytical laws
deduced from the physical principles that govern the properties of a Hall
effect thruster, relying on a list of simplifying assumptions. In addition,
constraints on the channel wall temperature as well as on the propellant atom
density inside the channel are taken into account. The validity of the scaling
laws is discussed in light of a vast database that comprises 23 single-stage
Hall effect thrusters covering a power range from 10 W to 50 kW. Finally, the
sizing method is employed to obtain a preliminary geometry and the magnetic
field strength for a 20 kW and a 25 kW Hall effect thruster able to deliver a
thrust of 1 N, respectively 1.5 N.


title:
Asymptotic normality and consistency of a two-stage generalized least
  squares estimator in the growth curve model

abstract:
  Let $\mathbf{Y}=\mathbf{X}\bolds{\Theta}\mathbf{Z}'+\bolds{\mathcal {E}}$ be
the growth curve model with $\bolds{\mathcal{E}}$ distributed with mean
$\mathbf{0}$ and covariance $\mathbf{I}_n\otimes\bolds{\Sigma}$, where
$\bolds{\Theta}$, $\bolds{\Sigma}$ are unknown matrices of parameters and
$\mathbf{X}$, $\mathbf{Z}$ are known matrices. For the estimable parametric
transformation of the form $\bolds
{\gamma}=\mathbf{C}\bolds{\Theta}\mathbf{D}'$ with given $\mathbf{C}$ and
$\mathbf{D}$, the two-stage generalized least-squares estimator $\hat{\bolds
\gamma}(\mathbf{Y})$ defined in (7) converges in probability to $\bolds\gamma$
as the sample size $n$ tends to infinity and, further,
$\sqrt{n}[\hat{\bolds{\gamma}}(\mathbf{Y})-\bolds {\gamma}]$ converges in
distribution to the multivariate normal distribution $\ma
thcal{N}(\mathbf{0},(\mathbf{C}\mathbf{R}^{-1}\mathbf{C}')\otimes(\mat
hbf{D}(\mathbf{Z}'\bolds{\Sigma}^{-1}\mathbf{Z})^{-1}\mathbf{D}'))$ under the
condition that $\lim_{n\to\infty}\mathbf{X}'\mathbf{X}/n=\mathbf{R}$ for some
positive definite matrix $\mathbf{R}$. Moreover, the unbiased and invariant
quadratic estimator $\hat{\bolds{\Sigma}}(\mathbf{Y})$ defined in (6) is also
proved to be consistent with the second-order parameter matrix
$\bolds{\Sigma}$.


title:
Using the Tremaine-Weinberg method to measure pattern speeds from
  H\alpha velocity maps

abstract:
  The Tremaine-Weinberg method is a well-known model independent technique for
measuring density wave pattern speeds in spiral galaxies. Here we show how it
can be applied to the data cubes (maps of surface brightness and velocity)
obtained in H-alpha emission using a Fabry-Perot spectrometer. One of the main
difficulties, the discontinuity of the H-alpha emission, is resolved using the
neighbouring stellar continuum delivered by the data cube. We argue from
symmetry that the motions not associated with the density wave should cancel.
We show that our pattern speeds are reasonable by computing corotation radii,
and comparing them to measured bar lengths. Simulations including star forming
gas also add credibility to our results. Nevertheless it will be necessary to
compare them with results using the spectra of the stellar components to
quantify any systematic deviations from valid pattern speed values.


title:
Forward antiproton-deuteron elastic scattering and total spin-dependent
  antiproton-deuteron cross sections at intermediate energies

abstract:
  Spin-dependent total pbar-d cross sections are considered using the optical
theorem. For this aim the full spin dependence of the forward pbar-d elastic
scattering amplitude is considered in a model independent way. The
single-scattering approximation is used to relate this amplitude to the
elementary amplitudes of pbar-p and pbar-n scattering and the deuteron form
factor. A formalism allowing to take into account Coulomb-nuclear interference
effects in polarized pbar-d cross sections is developed. Numerical calculations
for the polarized total pbar-d cross sections are performed at beam energies
20-300 MeV using the Nbar-N interaction models developed by the Julich group.
Double-scattering effects are estimated within the Glauber approach and found
to be in the order of 10-20%. Existing experimental data on differential pbar-d
cross sections are in good agreement with the performed Glauber calculations.
It is found that for the used Nbar-N models the total longitudinal and
transversal pbar-d cross sections are comparable in absolute value to those for
pbar-p scattering.