title: Invisible sunspots and rate of solar magnetic flux emergence

abstract:
  We study the visibility of sunspots and its influence on observed values of
sunspot region parameters. We use Virtual Observatory tools provided by
AstroGrid to analyse a sample of 6862 sunspot regions. By studying the
distributions of locations where sunspots were first and last observed on the
solar disk, we derive the visibility function of sunspots, the rate of magnetic
flux emergence and the ratio between the durations of growth and decay phases
of solar active regions. We demonstrate that the visibility of small sunspots
has a strong center-to-limb variation, far larger than would be expected from
geometrical (projection) effects. This results in a large number of young spots
being invisible: 44% of new regions emerging in the West of the Sun go
undetected. For sunspot regions that are detected, large differences exist
between actual locations and times of flux emergence, and the apparent ones
derived from sunspot data. The duration of the growth phase of solar regions
has been up to now underestimated.


title:
Synthetic Spectrum Constraints on a Model of the Cataclysmic Variable QU
  Carinae

abstract:
  Neither standard model SEDs nor truncated standard model SEDs fit observed
spectra of QU Carinae with acceptable accuracy over the range 900\AA to
3000\AA. Non-standard model SEDs fit the observation set accurately. The
non-standard accretion disk models have a hot region extending from the white
dwarf to $R=1.36R_{\rm wd}$,a narrow intermediate temperature annulus, and an
isothermal remainder to the tidal cutoff boundary. The models include a range
of $\dot{M}$ values between $1.0{\times}10^{-7}M_{\odot} {\rm yr}^{-1}$ and
$1.0{\times}10^{-6}M_{\odot} {\rm yr}^{-1}$ and limiting values of $M_{\rm wd}$
between $0.6M_{\odot}$ and $1.2M_{\odot}$. A solution with $M_{\rm
wd}=1.2M_{\odot}$ is consistent with an empirical mass-period relation. The set
of models agree on a limited range of possible isothermal region $T_{\rm eff}$
values between 14,000K and 18,000K. The model-to-model residuals are so similar
that it is not possible to choose a best model. The Hipparcos distance, 610 pc,
is representative of the model results. The orbital inclination is between
$40\arcdeg$ and $60\arcdeg$.


title: Realistic Equations of State for the Primeval Universe

abstract:
  Early universe equations of state including realistic interactions between
constituents are built up. Under certain reasonable assumptions, these
equations are able to generate an inflationary regime prior to the
nucleosynthesis period. The resulting accelerated expansion is intense enough
to solve the flatness and horizon problems. In the cases of curvature parameter
\kappa equal to 0 or +1, the model is able to avoid the initial singularity and
offers a natural explanation for why the universe is in expansion.


title: Strong spectral evolution during the prompt emission of GRB 070616

abstract:
  Swift has revealed features in GRB early light curves, such as steep decays
and X-ray flares, whose properties are consistent with an internal origin
though they are far from understood. The steep X-ray decay is often explained
using the curvature effect; however a significant number of GRBs display strong
spectral evolution during this phase, and a new mechanism must be invoked to
explain this. Of particular interest are the longest duration GRBs in which the
early emission can be studied in most detail. Here we present data for GRB
070616, in which the prompt emission shows a complex multipeaked structure,
leading to one of the longest prompt emission durations ever recorded. We take
advantage of extensive coverage of such a long burst by all Swift instruments.
Combining data from Swift and Suzaku we study the evolution of the prompt
emission spectrum, following the temporal variability of the peak energy and
spectral slope.


title: Limits to compression with cascaded quadratic soliton compressors

abstract:
  We study cascaded quadratic soliton compressors and address the physical
mechanisms that limit the compression. A nonlocal model is derived, and the
nonlocal response is shown to have an additional oscillatory component in the
nonstationary regime when the group-velocity mismatch (GVM) is strong. This
inhibits efficient compression. Raman-like perturbations from the cascaded
nonlinearity, competing cubic nonlinearities, higher-order dispersion, and
soliton energy may also limit compression, and through realistic numerical
simulations we point out when each factor becomes important. We find that it is
theoretically possible to reach the single-cycle regime by compressing
high-energy fs pulses for wavelengths $\lambda=1.0-1.3 \mu{\rm m}$ in a
$\beta$-barium-borate crystal, and it requires that the system is in the
stationary regime, where the phase mismatch is large enough to overcome the
detrimental GVM effects. However, the simulations show that reaching
single-cycle duration is ultimately inhibited by competing cubic nonlinearities
as well as dispersive waves, that only show up when taking higher-order
dispersion into account.


title:
Edge states on graphene ribbon in magnetic field: interplay between
  Dirac and ferromagnetic-like gaps

abstract:
  By combining analytic and numerical methods, edge states on a finite width
graphene ribbon in a magnetic field are studied in the framework of low-energy
effective theory that takes into account the possibility of quantum Hall
ferromagnetism (QHF) gaps and dynamically generated Dirac-like masses. The
analysis is done for graphene ribbons with both zigzag and armchair edges. The
characteristic features of the spectrum of the edge states in both these cases
are described. In particular, the conditions for the existence of the gapless
edge states are established. Implications of these results for the
interpretation of recent experiments are discussed.


title: Combinatorics in affine flag varieties

abstract:
  The Littelmann path moel gives a realization of the crystals of integrable
representations of symmetrizable Kac-Moody Lie algebras. Recent work of
Gaussent-Littelmann and others has demonstrated a connection between this model
and the geometry of the loop Grassmannian. The alcove walk model is a version
of the path model which is intimately connected to the combinatorics of the
affine Hecke algebra. In this paper we define a refined alcove walk model which
encodes the points of the affine flag variety. We show that this combinatorial
indexing naturally indexes the "cells" in generalized Mirkovic-Vilonen
intersections.


title: Koppelman formulas and the $\dbar$-equation on an analytic space

abstract:
  Let $X$ be an analytic space of pure dimension. We introduce a formalism to
generate intrinsic weighted Koppelman formulas on $X$ that provide solutions to
the $\dbar$-equation. We prove that if $\phi$ is a smooth $(0,q+1)$-form on a
Stein space $X$ with $\dbar\phi=0$, then there is a smooth $(0,q)$-form $\psi$
on $X_{reg}$ with at most polynomial growth at $X_{sing}$ such that
$\dbar\psi=\phi$. The integral formulas also give other new existence results
for the $\dbar$-equation and Hartogs theorems, as well as new proofs of various
known results.


title: Hermitian integral geometry

abstract:
  We give in explicit form the principal kinematic formula for the action of
the affine unitary group on $\C^n$, together with a straightforward algebraic
method for computing the full array of unitary kinematic formulas, expressed in
terms of certain convex valuations introduced, essentially, by H. Tasaki. We
introduce also several other canonical bases for the algebra of
unitary-invariant valuations, explore their interrelations, and characterize in
these terms the cones of positive and monotone elements.


title: Nonparametric estimation of a convex bathtub-shaped hazard function

abstract:
  In this paper, we study the nonparametric maximum likelihood estimator (MLE)
of a convex hazard function. We show that the MLE is consistent and converges
at a local rate of $n^{2/5}$ at points $x_0$ where the true hazard function is
positive and strictly convex. Moreover, we establish the pointwise asymptotic
distribution theory of our estimator under these same assumptions. One notable
feature of the nonparametric MLE studied here is that no arbitrary choice of
tuning parameter (or complicated data-adaptive selection of the tuning
parameter) is required.


title: Subarea law of entanglement in nodal fermionic systems

abstract:
  We investigate the subarea law scaling properties of the block entropy in
bipartite fermionic systems which do not have a finite Fermi surface. It is
found that in gapped regimes the leading subarea term is a negative constant,
whereas in critical regimes with point nodes the leading subarea law is a
logarithmic additive term. At the phase boundary that separates the critical
and non-critical regimes, the subarea scaling shows power-law behavior.


title: Regular Expression Subtyping for XML Query and Update Languages

abstract:
  XML database query languages such as XQuery employ regular expression types
with structural subtyping. Subtyping systems typically have two presentations,
which should be equivalent: a declarative version in which the subsumption rule
may be used anywhere, and an algorithmic version in which the use of
subsumption is limited in order to make typechecking syntax-directed and
decidable. However, the XQuery standard type system circumvents this issue by
using imprecise typing rules for iteration constructs and defining only
algorithmic typechecking, and another extant proposal provides more precise
types for iteration constructs but ignores subtyping. In this paper, we
consider a core XQuery-like language with a subsumption rule and prove the
completeness of algorithmic typechecking; this is straightforward for XQuery
proper but requires some care in the presence of more precise iteration typing
disciplines. We extend this result to an XML update language we have introduced
in earlier work.


title: Impact of Errors in Operational Spreadsheets

abstract:
  All users of spreadsheets struggle with the problem of errors. Errors are
thought to be prevalent in spreadsheets, and in some instances they have cost
organizations millions of dollars. In a previous study of 50 operational
spreadsheets we found errors in 0.8% to 1.8% of all formula cells, depending on
how errors are defined. In the current study we estimate the quantitative
impacts of errors in 25 operational spreadsheets from five different
organizations. We find that many errors have no quantitative impact on the
spreadsheet. Those that have an impact often affect unimportant portions of the
spreadsheet. The remaining errors do sometimes have substantial impacts on key
aspects of the spreadsheet. This paper provides the first fully-documented
evidence on the quantitative impact of errors in operational spreadsheets.


title: Tidal Evolution of Close-in Extra-Solar Planets

abstract:
  The distribution of eccentricities e of extra-solar planets with semi-major
axes a > 0.2 AU is very uniform, and values for e are relatively large,
averaging 0.3 and broadly distributed up to near 1. For a < 0.2 AU,
eccentricities are much smaller (most e < 0.2), a characteristic widely
attributed to damping by tides after the planets formed and the protoplanetary
gas disk dissipated. Most previous estimates of the tidal damping considered
the tides raised on the planets, but ignored the tides raised on the stars.
Most also assumed specific values for the planets' poorly constrained tidal
dissipation parameter Qp. Perhaps most important, in many studies, the strongly
coupled evolution between e and a was ignored. We have now integrated the
coupled tidal evolution equations for e and a over the estimated age of each
planet, and confirmed that the distribution of initial e values of close-in
planets matches that of the general population for reasonable Q values, with
the best fits for stellar and planetary Q being ~10^5.5 and ~10^6.5,
respectively. The accompanying evolution of a values shows most close-in
planets had significantly larger a at the start of tidal migration. The earlier
gas disk migration did not bring all planets to their current orbits. The
current small values of a were only reached gradually due to tides over the
lifetimes of the planets. These results may have important implications for
planet formation models, atmospheric models of "hot Jupiters", and the success
of transit surveys.


title: Reduction of Quantum Phase Fluctuations in Intermediate States

abstract:
  Recently we have shown that the reduction of the Carruthers-Nieto symmetric
quantum phase fluctuation parameter (U) with respect to its coherent state
value corresponds to an antibunched state, but the converse is not true.
Consequently reduction of U is a stronger criterion of nonclassicality than the
lowest order antibunching. Here we have studied the possibilities of reduction
of $U$ in intermediate states by using the Barnett Pegg formalism. We have
shown that the reduction of phase fluctuation parameter U can be seen in
different intermediate states, such as binomial state, generalized binomial
state, hypergeometric state, negative binomial state, and photon added coherent
state. It is also shown that the depth of nonclassicality can be controlled by
various parameters related to intermediate states. Further, we have provided
specific examples of antibunched states, for which $U$ is greater than its
poissonian state value.


title: On the Stickiness Property

abstract:
  In [2] the notion of stickiness for stochastic processes was introduced. It
was also shown that stickiness implies absense of arbitrage in a market with
proportional transaction costs. In this paper, we investigate the notion of
stickiness further. In particular, we give examples of processes that are not
semimartingales but are sticky.


title: Neighborhood Chance and Neighborhood Change

abstract:
  WITHDRAWAL NOTICE
  This paper has been withdrawn by the authors as required by the American
Journal of Sociology, which has accepted the paper for publication. AJS will
not publish papers if the preprint remains posted on arXiv.


title:
Hitchin's equations and integrability of BPS Z(N) strings in Yang-Mills
  theories

abstract:
  We show that Z(N) string's BPS equations are equivalent to the Hitchin's
equations (or self-duality equation) and also to the zero curvature condition.
We construct a general form for BPS Z(N) string solutions for arbitrary simple
gauge groups with non-trivial center. Depending on the vacuum solutions
considered, the Z(N) string's BPS equations reduce to different two dimensional
integrable field equations. For a particular vacuum we obtain the equation of
affine Toda field theory.


title: Global controllability with a single local actuator

abstract:
  We show that we can achieve global density-operator controllability for most
N-dimensional bilinear Hamiltonian control systems with general fixed couplings
using a single, locally-acting actuator that modulates one energy-level
transition. Controllability depends upon the position of the actuator and
relies on the absence of either decompositions into non-interacting subgroups
or symmetries restricting the dynamics to a subgroup of SU(N). These results
are applied to spin-chain systems and used to explicitly construct control
sequences for a single binary-valued switch actuator.


title: An infinite-temperature limit for a quantum scattering process

abstract:
  We study a quantum dynamical semigroup driven by a Lindblad generator with a
deterministic Schr\"odinger part and a noisy Poission-timed scattering part.
The dynamics describes the evolution of a test particle in $\R^{n}$, $n=1,2,3$,
immersed in a gas, and the noisy scattering part is defined by the reduced
effect of an individual interaction, where the interaction between the test
particle and a single gas particle is via a repulsive point potential. In the
limit that the mass ratio $\lambda=\frac{m}{M}$ tends to zero and the
collisions become more frequent as $\frac{1}{\lambda}$, we show that our
dynamics $\Phi_{t,\lambda}$ approaches a limiting dynamics
$\Phi_{t,\lambda}^{\diamond}$ with second order error. Working in the
Heisenberg representation, for $G\in \Bi(L^{2}(\R^{n}))$ $n=1,3$ we bound the
difference between $\Phi_{t,\lambda}(G)$ and $\Phi_{t,\lambda}^{\diamond}(G)$
in operator norm proportional to $\lambda^{2}$.


title:
Quantum criticality of U(1) gauge theories with fermionic and bosonic
  matter in two spatial dimensions

abstract:
  We consider relativistic U(1) gauge theories in 2+1 dimensions, with N_b
species of complex bosons and N_f species of Dirac fermions at finite
temperature. The quantum phase transition between the Higgs and Coulomb phases
is described by a conformal field theory (CFT). At large N_b and N_f, but for
arbitrary values of the ratio N_b/N_f, we present computations of various
critical exponents and universal amplitudes for these CFTs. We make contact
with the different spin-liquids, charge-liquids and deconfined critical points
of quantum magnets that these field theories describe. We compute physical
observables that may be measured in experiments or numerical simulations of
insulating and doped quantum magnets.


title: Emergent physics: Fermi point scenario

abstract:
  The Fermi-point scenario of emergent gravity has the following consequences:
gravity emerges together with fermionic and bosonic matter; emergent fermionic
matter consists of massless Weyl fermions; emergent bosonic matter consists of
gauge fields; Lorentz symmetry persists well above the Planck energy;
space-time is naturally 4-dimensional; Universe is naturally flat; cosmological
constant is naturally small or zero; underlying physics is based on discrete
symmetries; `quantum gravity' cannot be obtained by quantization of Einstein
equations; there is no contradiction between quantum mechanics and gravity;
etc.


title: Single-contact pressure solution creep on calcite monocrystals

abstract:
  Pressure solution creep rates and interface structures have been measured by
two methods on calcite single crystals. In the first kind of experiments,
calcite monocrystals were indented at 40 degrees C for six weeks using ceramic
indenters under stresses in the 50-200 MPa range in a saturated solution of
calcite and in a calcite-saturated aqueous solution of NH4Cl. The deformation
(depth of the hole below the indenter) is measured ex-situ at the end of the
experiment. In the second type of experiment, calcite monocrystals were
indented by spherical glass indenters for 200 hours under stresses in the 0-100
MPa range at room temperature in a saturated aqueous solution of calcite. The
displacement of the indenter was continuously recorded using a specially
constructed differential dilatometer. The experiments conducted in a
calcite-saturated aqueous solution of NH4Cl show an enhanced indentation rate
owing to the fairly high solubility of calcite in this solution. In contrast,
the experiments conducted in a calcite-saturated aqueous solution show moderate
indentation rate and the dry control experiments did not show any measurable
deformation. The rate of calcite indentation is found to be inversely
proportional to the indenter diameter, thus indicating that the process is
diffusion-controlled. The microcracks in the dissolution region under the
indenter dramatically enhance the rate of calcite indentation by a significant
reduction of the distance of solute transport in the trapped fluid phase. This
result indicates that care should be taken in extrapolating the kinetic data of
pressure solution creep from one mineral to another.


title: Convergence of multi-dimensional quantized $SDE$'s

abstract:
  We quantize a multidimensional $SDE$ (in the Stratonovich sense) by solving
the related system of $ODE$'s in which the $d$-dimensional Brownian motion has
been replaced by the components of functional stationary quantizers. We make a
connection with rough path theory to show that the solutions of the quantized
solutions of the $ODE$ converge toward the solution of the $SDE$. On our way to
this result we provide convergence rates of optimal quantizations toward the
Brownian motion for $\frac 1q$-H\" older distance, $q>2$, in $L^p(\P)$.


title:
Renormalization group functions for the Wess-Zumino model: up to 200
  loops through Hopf algebras

abstract:
  We obtain the contributions to the renormalization group functions of all the
diagrams containing the unique one-loop primitive divergence of a simple
supersymmetric Wess--Zumino model, up to more than 200 loops. The asymptotic
behavior of the coefficients in the expansion of the anomalous dimension is
analyzed.


title:
Generalized incidence theorems, homogeneous forms, and sum-product
  estimates in finite fields

abstract:
  In recent years, sum-product estimates in Euclidean space and finite fields
have been studied using a variety of combinatorial, number theoretic and
analytic methods. Erdos type problems involving the distribution of distances,
areas and volumes have also received much attention. In this paper we prove a
relatively straightforward function version of an incidence results for points
and planes previously established in \cite{HI07} and \cite{HIKR07}. As a
consequence of our methods, we obtain sharp or near sharp results on the
distribution of volumes determined by subsets of vector spaces over finite
fields and the associated arithmetic expressions.
  In particular, our machinery enables us to prove that if $E \subset {\Bbb
F}_q^d$, $d \ge 4$, the $d$-dimensional vector space over a finite field ${\Bbb
F}_q$, of size much greater than $q^{\frac{d}{2}}$, and if $E$ is a product
set, then the set of volumes of $d$-dimensional parallelepipeds determined by
$E$ covers ${\Bbb F}_q$. This result is sharp as can be seen by taking $E$ to
equal to $A \times A \times ... \times A$, where $A$ is a sub-field of ${\Bbb
F}_q$ of size $\sqrt{q}$. In three dimensions we establish the same result if
$|E| \gtrsim q^{{15/8}}$. We prove in three dimensions that the set of volumes
covers a positive proportion of ${\Bbb F}_q$ if $|E| \ge Cq^{{3/2}}$. Finally
we show that in three dimensions the set of volumes covers a positive
proportion of ${\Bbb F}_q$ if $|E| \ge Cq^2$, without any further assumptions
on $E$, which is again sharp as taking $E$ to be a 2-plane through the origin
shows.


title: Effective Field Theory and Finite Density Systems

abstract:
  This review gives an overview of effective field theory (EFT) as applied at
finite density, with a focus on nuclear many-body systems. Uniform systems with
short-range interactions illustrate the ingredients and virtues of many-body
EFT and then the varied frontiers of EFT for finite nuclei and nuclear matter
are surveyed.


title: Study of the preheating phase of chaotic inflation

abstract:
  Particle production and its effects on the inflaton field are investigated
during the preheating phase of chaotic inflation using a model consisting of a
massive scalar inflaton field coupled to N massless quantum scalar fields. The
effects of spacetime curvature and interactions between the quantum fields are
ignored. A large N expansion is used to obtain a coupled set of equations
including a backreaction equation for the classical inflaton field. Previous
studies of preheating using these equations have been done. Here the first
numerical solutions to the full set of equations are obtained for various
values of the coupling constant and the initial amplitude of the inflaton
field. States are chosen so that initially the backreaction effects on the
inflaton field are small and the mode equations for the quantum fields take the
form of Mathieu equations. Potential problems relating to the parametric
amplification of certain modes of the quantum fields are identified and
resolved. A detailed study of the damping of the inflaton field is undertaken.
Some predictions of previous studies are verified and some new results are
obtained.


title: Biflatness and Pseudo-Amenability of Segal algebras

abstract:
  We investigate generalized amenability and biflatness properties of various
(operator) Segal algebras in both the group algebra, L1(G), and the Fourier
algebra, A(G), of a locally compact group, G.


title:
On statistical mechanics of a single particle in high-dimensional random
  landscapes

abstract:
  We discuss recent results of the replica approach to statistical mechanics of
a single classical particle placed in a random N(>>1)-dimensional Gaussian
landscape. The particular attention is paid to the case of landscapes with
logarithmically growing correlations and to its recent generalisations. Those
landscapes give rise to a rich multifractal spatial structure of the associated
Boltzmann-Gibbs measure. We also briefly mention related results on counting
stationary points of random Gaussian surfaces, as well as ongoing research on
statistical mechanics in a random landscape constructed locally by adding many
squared Gaussian-distributed terms.


title:
Electronic Structure of Copper Phthalocyanine: a Comparative Density
  Functional Theory Study

abstract:
  We present a systematic density functional theory study of the electronic
structure of copper phthalocyanine (CuPc), using several different (semi)-local
and hybrid functionals, and compare the results to experimental photoemission
data. We show that semi-local functionals fail qualitatively for CuPc,
primarily because of under-binding of localized orbitals due to
self-interaction errors. We discuss an appropriate choice of functional for
studies of CuPc/metal interfaces and suggest the Heyd-Scuseria-Ernzerhof
screened hybrid functional as a suitable compromise functional.


title: Jumping Numbers on Algebraic Surfaces with Rational Singularities

abstract:
  In this article, we study the jumping numbers of an ideal in the local ring
at rational singularity on a complex algebraic surface. By understanding the
contributions of reduced divisors on a fixed resolution, we are able to present
an algorithm for finding of the jumping numbers of the ideal. This shows, in
particular, how to compute the jumping numbers of a plane curve from the
numerical data of its minimal resolution. In addition, the jumping numbers of
the maximal ideal at the singular point in a Du Val or toric surface
singularity are computed, and applications to the smooth case are explored.


title: Topological censorship and chronology protection

abstract:
  Over the past two decades, substantial efforts have been made to understand
the way in which physics enforces the ordinary topology and causal structure
that we observe, from subnuclear to cosmological scales. We review the status
of topological censorship and the topology of event horizons; chronology
protection in classical and semiclassical gravity; and related progress in
establishing quantum energy inequalities.


title: Global fixed points for centralizers and Morita's Theorem

abstract:
  We prove a global fixed point theorem for the centralizer of a homeomorphism
of the two dimensional disk $D$ that has attractor-repeller dynamics on the
boundary with at least two attractors and two repellers. As one application, we
show that there is a finite index subgroup of the centralizer of a
pseudo-Anosov homeomorphism with infinitely many global fixed points. As
another application we give an elementary proof of Morita's Theorem, that the
mapping class group of a closed surface $S$ of genus $g$ does not lift to the
group of diffeormorphisms of $S$ and we improve the lower bound for $g$ from 5
to 3.


title:
On Existence and Uniqueness of Universal Enveloping Locally C*-Algebra
  for a Locally JB-Algebra

abstract:
  A theorem is presented on existence and uniqueness up to the topological
*-isomorphism of universal locally C*-algebra for an arbitrary locally
JB-algebra.


title: Quantum invariants can provide sharp Heegaard genus bounds

abstract:
  Using Seifert fibered three-manifold examples of Boileau and Zieschang, we
demonstrate that the Reshetikhin-Turaev quantum invariants may be used to
provide a sharp lower bound on the Heegaard genus which is strictly larger than
the rank of the fundamental group.


title:
Prompt Shocks in the Gas Disk Around a Recoiling Supermassive Black Hole
  Binary

abstract:
  Supermassive black hole binaries (BHBs) produced in galaxy mergers recoil at
the time of their coalescence due to the emission of gravitational waves (GWs).
We simulate the response of a thin, 2D disk of collisionless particles,
initially on circular orbits around a 10^6 M_sun BHB, to kicks that are either
parallel or perpendicular to the initial orbital plane. Typical kick velocities
(v_k) can exceed the sound speed in a circumbinary gas disk. While the inner
disk is strongly bound to the recoiling binary, the outer disk is only weakly
bound or unbound. This leads to differential motions in the disturbed disk that
increase with radius and can become supersonic at ~700 Schwarzschild radii for
v_k ~500 km/s, implying that shocks form beyond this radius. We indeed find
that kicks in the disk plane lead to immediate strong density enhancements
(within weeks) in a tightly wound spiral caustic, propagating outward at the
speed v_k. Concentric density enhancements are also observed for kicks
perpendicular to the disk, but are weaker and develop into caustics only after
a long delay (>1 year). Unless both BH spins are low or precisely aligned with
the orbital angular momentum, a significant fraction (> several %) of kicks are
sufficiently large and well aligned with the orbital plane for strong shocks to
be produced. The shocks could result in an afterglow whose characteristic
photon energy increases with time, from the UV (~10eV) to the soft X-ray
(~100eV) range, between one month and one year after the merger. This could
help identify EM counterparts to GW sources discovered by LISA.


title:
Non-thermal X-rays from the Ophiuchus galaxy cluster and dark matter
  annihilation

abstract:
  We investigate a scenario where the recently discovered non-thermal hard
X-ray emission from the Ophiuchus cluster originates from inverse Compton
scattering of energetic electrons and positrons produced in weakly interacting
dark matter pair annihilations. We show that this scenario can account for both
the X-ray and the radio emission, provided the average magnetic field is of the
order of 0.1 microGauss. We demonstrate that GLAST will conclusively test the
dark matter annihilation hypothesis. Depending on the particle dark matter
model, GLAST might even detect the monochromatic line produced by dark matter
pair annihilation into two photons.


title:
Precise radial velocities of giant stars. IV. A correlation between
  surface gravity and radial velocity variation and a statistical investigation
  of companion properties

abstract:
  Since 1999, we have been conducting a radial velocity survey of 179 K giants
using the CAT at UCO/Lick observatory. At present ~20-100 measurements have
been collected per star with a precision of 5 to 8 m/s. Of the stars monitored,
145 (80%) show radial velocity (RV) variations at a level >20 m/s, of which 43
exhibit significant periodicities. Our aim is to investigate possible
mechanism(s) that cause these observed RV variations. We intend to test whether
these variations are intrinsic in nature, or possibly induced by companions, or
both. In addition, we aim to characterise the parameters of these companions. A
relation between log g and the amplitude of the RV variations is investigated
for all stars in the sample. Furthermore, the hypothesis that all periodic RV
variations are caused by companions is investigated by comparing their inferred
orbital statistics with the statistics of companions around main sequence
stars. A strong relation is found between the amplitude of the RV variations
and log g in K giant stars, as suggested earlier by Hatzes & Cochran (1998).
However, most of the stars exhibiting periodic variations are located above
this relation. These RV variations can be split in a periodic component which
is not correlated with log g and a random residual part which does correlate
with log g. Compared to main-sequence stars, K giants frequently exhibit
periodic RV variations. Interpreting these RV variations as being caused by
companions, the orbital param eters are different from the companions orbiting
dwarfs. Intrinsic mechanisms play an important role in producing RV variations
in K giants stars, as suggested by their dependence on log g. However, it
appears that periodic RV variations are additional to these intrinsic
variations, consistent with them being caused by companions.


title: Reconstructing a general inflationary action

abstract:
  If inflation is to be considered in an unbiased way, as possibly originating
from one of a wide range of underlying theories, then observations need not be
simply applied to reconstructing the inflaton potential, V(\phi), or a specific
kinetic term, as in DBI inflation, but rather to reconstruct the inflationary
action in its entirety. We discuss the constraints that can be placed on a
general single field action from measurements of the primordial scalar and
tensor fluctuation power spectra and non-Gaussianities. We also present the
flow equation formalism for reconstructing a general inflationary Lagrangian,
L(X,\phi), with X={1/2}\partial_\mu\phi\partial^\mu\phi, in a general gauge,
that reduces to canonical and DBI inflation in the specific gauge \partial
L/\partial X = c_s^{-1}.


title: Two-loop Jet-Function and Jet-Mass for Top Quarks

abstract:
  We compute the two-loop heavy quark jet-function in the heavy quark limit.
This is one of the key ingredients in next-to-next-to-leading order (NNLO) and
next-to-next-to-leading-log order (NNLL) computations of the invariant mass
distribution of top-jets at a future e+e- collider. The shape of the top
invariant mass distribution is affected by large logs which we compute at NNLL
order. Exploiting the non-abelian exponentiation theorem, a definition of the
top jet-mass is given which is transitive and whose renormalization group
evolution is determined by the cusp-anomalous dimension to all orders in
perturbation theory. Relations of the jet-mass to the pole, MSbar, and 1S
masses are presented at two-loop order.


title: Resonating plaquette phases in large spin cold atom systems

abstract:
  Large spin cold atom systems can exhibit novel magnetic properties which do
not appear in usual spin-1/2 systems. We investigate the SU(4) resonating
plaquette state in the three dimensional cubic optical lattice with spin-3/2
cold fermions. A novel gauge field formalism is constructed to describe the
Rokhsar-Kivelson type of Hamiltonian and a duality transformation is used to
study the phase diagram. Due to the proliferation of topological defects, the
system is generally gapped for the whole phase diagram of the quantum model,
which agrees with the recent numerical studies. A critical line is found for
the classical plaquette system, which also corresponds to a quantum many-body
wavefunction in a "plaquette liquid phase".


title:
SUSY Flat Direction Decay - the prospect of particle production and
  preheating investigated in the unitary gauge

abstract:
  We look at the possibility of non-perturbative particle production after
inflation from SUSY flat directions produced by rotating eigenstates thereby
avoiding the standard adiabaticity conditions. This might lead to preheating
and prevent the delay of thermalisation of the universe. We investigate the
flat directions $LLE^c$ and $U^cD^cD^c$ and find no particle production. These
2 directions are very important, since they have been named as possible
candidates for being the inflaton. We investigate $QLQLQLE^c$ and find particle
production and therefore the possibility of preheating. We investigate the
$LLE^c$ and $U^cD^cD^c$ directions appearing simultaneously, and find no
production. Finally, we investigate $LLE^c$ and $QLD^c$ simultaneously - with
one L-field in common. Here we do find particle production and therefore the
possibility of preheating. This means that if SUSY flat directions are to delay
thermalisation and thus explain the (lack of) gravitino production, it is
necessary to explain why complicated directions as $QLQLQLE^c$ are not exited,
and why combinations like $LLE^c$ and $QLD^c$ are not both exited.


title: Comparative Analysis of Control Strategies

abstract:
  Different ways of modelling quantum control systems, formulating control
problems and solving the resulting problems are considered and compared. In
particular, we compare the performance of geometric and optimal control, as
well as iterative techniques for optimal control design versus local gradient
optimization using a Lyapunov-type potential function for two problems of
general interest: global control of qubits and entanglement generation in the
form of Bell state preparation.


title: Finite-Size Effects for Dyonic Giant Magnons

abstract:
  We compute finite-size corrections to dyonic giant magnons in two ways. One
is by examining the asymptotic behavior of helical strings of hep-th/0609026 as
elliptic modulus k goes to unity, and the other is by applying the generalized
Luscher formula for mu-term of arXiv:0708.2208 to the situation in which
incoming particles are boundstates. By careful choice of poles in the
su(2|2)^2-invariant S-matrix, we find agreement of the two results, which makes
possible to predict the (leading) finite-size correction for dyonic giant
magnons to all orders in the 't Hooft coupling.


title: Hausdorff clustering

abstract:
  A clustering algorithm based on the Hausdorff distance is introduced and
compared to the single and complete linkage. The three clustering procedures
are applied to a toy example and to the time series of financial data. The
dendrograms are scrutinized and their features confronted. The Hausdorff
linkage relies of firm mathematical grounds and turns out to be very effective
when one has to discriminate among complex structures.

categories: q-fin.ST cond-mat.stat-mech physics.data-an physics.soc-ph


title:
Tailoring Metallodielectric Structures for Super Resolution and
  Superguiding Applications in the Visible and Near IR Ranges

abstract:
  We discuss propagation effects in realistic, transparent, metallo-dielectric
photonic band gap structures in the context of negative refraction and
super-resolution in the visible and near infrared ranges. In the resonance
tunneling regime, we find that for transverse-magnetic incident polarization,
field localization effects contribute to a waveguiding phenomenon that makes it
possible for the light to remain confined within a small fraction of a
wavelength, without any transverse boundaries, due to the suppression of
diffraction. This effect is related to negative refraction of the Poynting
vector inside each metal layer, balanced by normal refraction inside the
adjacent dielectric layer: The degree of field localization and material
dispersion together determine the total momentum that resides within any given
layer, and thus the direction of energy flow. We find that the transport of
evanescent wave vectors is mediated by the excitation of quasi-stationary, low
group velocity surface waves responsible for relatively large losses. As
representative examples we consider transparent metallo-dielectric stacks such
as Ag/TiO2 and Ag/GaP and show in detail how to obtain the optimum conditions
for high transmittance of both propagating and evanescent modes for
super-guiding and super resolution applications across the visible and near IR
ranges. Finally, we study the influence of gain on super-resolution. We find
that the introduction of gain can compensate the losses caused by the
excitation of surface plasmons, improves the resolving characteristics of the
lens, and leads to gain-tunable super-resolution.


title:
Micro-Hotplates for Thermal Characterisation of Structural Materials of
  Mems

abstract:
  Accurate knowledge of mechanical and thermal properties of structural
materials used in MEMS is essential for optimum geometric and functional
design. The extraction of precise physical properties is rather complicated due
to the size effects, the complexity of the structures and the variations of
formation processes. This work is intended to determine the thermal properties
of silicon-nitride and diamond layers applied in thermal sensor structures by
analyzing thermal responses of a multilayer micro-heater structure.


title: On lattices and their ideal lattices, and posets and their ideal posets

abstract:
  For P a poset or lattice, let Id(P) denote the poset, respectively, lattice,
of upward directed downsets in P, including the empty set, and let
id(P)=Id(P)-\{\emptyset\}. This note obtains various results to the effect that
Id(P) is always, and id(P) often, "essentially larger" than P. In the first
vein, we find that a poset P admits no "<"-respecting map (and so in
particular, no one-to-one isotone map) from Id(P) into P, and, going the other
way, that an upper semilattice S admits no semilattice homomorphism from any
subsemilattice of itself onto Id(S).
  The slightly smaller object id(P) is known to be isomorphic to P if and only
if P has ascending chain condition. This result is strengthened to say that the
only posets P_0 such that for every natural number n there exists a poset P_n
with id^n(P_n)\cong P_0 are those having ascending chain condition. On the
other hand, a wide class of cases is noted here where id(P) is embeddable in P.
  Counterexamples are given to many variants of the results proved.


title:
Could the Ultra Metal-poor Stars be Chemically Peculiar and Not Related
  to the First Stars?

abstract:
  Chemically peculiar stars define a class of stars that show unusual elemental
abundances due to stellar photospheric effects and not due to natal variations.
In this paper, we compare the elemental abundance patterns of the ultra
metal-poor stars with metallicities [Fe/H] $\sim -5 $ to those of a subclass of
chemically peculiar stars. These include post-AGB stars, RV Tauri variable
stars, and the Lambda Bootis stars, which range in mass, age, binarity, and
evolutionary status, yet can have iron abundance determinations as low as
[Fe/H] $\sim -5$. These chemical peculiarities are interpreted as due to the
separation of gas and dust beyond the stellar surface, followed by the
accretion of dust depleted-gas. Contrary to this, the elemental abundances in
the ultra metal-poor stars are thought to represent yields of the most
metal-poor supernova and, therefore, observationally constrain the earliest
stages of chemical evolution in the Universe. The abundance of the elements in
the photospheres of the ultra metal-poor stars appear to be related to the
condensation temperature of that element; if so, then their CNO abundances
suggest true metallicities of [X/H]~ -2 to -4, rather than their present
metallicities of [Fe/H] < -5.


title: Why Y chromosome is shorter and women live longer?

abstract:
  We have used the Penna ageing model to analyze how the differences in
evolution of sex chromosomes depend on the strategy of reproduction. In
panmictic populations, when females (XX) can freely choose the male partner
(XY) for reproduction from the whole population, the Y chromosome accumulates
defects and eventually the only information it brings is a male sex
determination. As a result of shrinking Y chromosome the males become
hemizygous in respect to the X chromosome content and are characterized by
higher mortality, observed also in the human populations. If it is assumed in
the model that the presence of the male is indispensable at least during the
pregnancy of his female partner and he cannot be seduced by another female at
least during the one reproduction cycle - the Y chromosome preserves its
content, does not shrink and the lifespan of females and males is the same.
Thus, Y chromosome shrinks not because of existing in one copy, without the
possibility of recombination, but because it stays under weaker selection
pressure; in panmictic populations without the necessity of being faithful, a
considerable fraction of males is dispensable and they can be eliminated from
the population without reducing its reproduction potential.


title: Classical and quantum Coulomb crystals

abstract:
  Strong correlation effects in classical and quantum plasmas are discussed. In
particular, Coulomb (Wigner) crystallization phenomena are reviewed focusing on
one-component non-neutral plasmas in traps and on macroscopic two-component
neutral plasmas. The conditions for crystal formation in terms of critical
values of the coupling parameters and the distance fluctuations and the phase
diagram of Coulomb crystals are discussed.


title: Simple Jordan conformal superalgebras

abstract:
  We classify simple finite Jordan conformal superalgebras and establish
preliminary results for the classification of simple finite Jordan
pseudoalgebras.


title: Distributed Source Coding for Interactive Function Computation

abstract:
  A two-terminal interactive distributed source coding problem with alternating
messages for function computation at both locations is studied. For any number
of messages, a computable characterization of the rate region is provided in
terms of single-letter information measures. While interaction is useless in
terms of the minimum sum-rate for lossless source reproduction at one or both
locations, the gains can be arbitrarily large for function computation even
when the sources are independent. For a class of sources and functions,
interaction is shown to be useless, even with infinite messages, when a
function has to be computed at only one location, but is shown to be useful, if
functions have to be computed at both locations. For computing the Boolean AND
function of two independent Bernoulli sources at both locations, an achievable
infinite-message sum-rate with infinitesimal-rate messages is derived in terms
of a two-dimensional definite integral and a rate-allocation curve. A general
framework for multiterminal interactive function computation based on an
information exchange protocol which successively switches among different
distributed source coding configurations is developed. For networks with a star
topology, multiple rounds of interactive coding is shown to decrease the
scaling law of the total network rate by an order of magnitude as the network
grows.


title: Layering and position-dependent diffusive dynamics of confined fluids

abstract:
  We study the diffusive dynamics of a hard-sphere fluid confined between
parallel smooth hard walls. The position-dependent diffusion coefficient normal
to the walls is larger in regions of high local packing density. High density
regions also have the largest available volume, consistent with the fast local
diffusivity. Indeed, local and global diffusivities as a function of the Widom
insertion probability approximately collapse onto a master curve. Parallel and
average normal diffusivities are strongly coupled at high densities and deviate
from bulk fluid behavior.


title: Selective Efficient Quantum Process Tomography

abstract:
  We present a new method for quantum process tomography. The method enables us
to efficiently estimate, with fixed precision, any of the parameters
characterizing a quantum channel. It is selective since one can choose to
estimate the value of any specific set of matrix elements of the super-operator
describing the channel. Also, we show how to efficiently estimate all the
average survival probabilities associated with the channel (i.e., all the
diagonal elements of its $\chi$--matrix.


title: Tuning density profiles and mobility of inhomogeneous fluids

abstract:
  Density profiles are the most common measure of inhomogeneous structure in
confined fluids, but their connection to transport coefficients is poorly
understood. We explore via simulation how tuning particle-wall interactions to
flatten or enhance the particle layering of a model confined fluid impacts its
self-diffusivity, viscosity, and entropy. Interestingly, interactions that
eliminate particle layering significantly reduce confined fluid mobility,
whereas those that enhance layering can have the opposite effect. Excess
entropy helps to understand and predict these trends.


title: Casimir energies with finite-width mirrors

abstract:
  We use a functional approach to the Casimir effect in order to evaluate the
exact vacuum energy for a real scalar field in $d+1$ dimensions, in the
presence of backgrounds that, in a particular limit, impose Dirichlet boundary
conditions on one or two parallel surfaces. Outside of that limit, the
background may be thought of as describing finite-width mirrors with
frequency-dependent transmission and reflection coefficients. We provide new
explicit results for the Casimir energy in some particular backgrounds


title:
High-fidelity quantum operations on superconducting qubits in the
  presence of noise

abstract:
  We present a scheme for implementing quantum operations with superconducting
qubits. Our approach uses a "coupler" qubit to mediate a controllable, secular
interaction between "data" qubits, pulse sequences which strongly mitigate the
effects of 1/f flux noise, and a high-Q resonator-based local memory. We
develop a Monte-Carlo simulation technique capable of describing arbitrary
noise-induced dephasing and decay, and demonstrate in this system a set of
universal gate operations with O(10^-5) error probabilities in the presence of
experimentally measured levels of 1/f noise. We then add relaxation and
quantify the decay times required to maintain this error level.


title:
Non-Supersymmetric Seiberg Duality, Orientifold QCD and Non-Critical
  Strings

abstract:
  We propose an electric-magnetic duality and conjecture an exact conformal
window for a class of non-supersymmetric U(N_c) gauge theories with fermions in
the (anti)symmetric representation of the gauge group and N_f additional scalar
and fermion flavors. The duality exchanges N_c with N_f -N_c \mp 4 leaving N_f
invariant, and has common features with Seiberg duality in N=1 SQCD with SU or
SO/Sp gauge group. At large N the duality holds due to planar equivalence with
N=1 SQCD. At finite N we embed these gauge theories in a setup with D-branes
and orientifolds in a non-supersymmetric, but tachyon-free, non-critical type
0B string theory and argue in favor of the duality in terms of boundary and
crosscap state monodromies as in analogous supersymmetric situations. One can
verify explicitly that the resulting duals have matching global anomalies.
Finally, we comment on the moduli space of these gauge theories and discuss
other potential non-supersymmetric examples that could exhibit similar
dualities.


title: The Energy of n Identical Bosons in a Finite Volume at O(L^{-7})

abstract:
  The volume dependence of the ground-state energy of n identical bosons with
short-range interactions in a periodic spatial volume with sides of length L is
calculated at order L^{-7} in the large volume expansion. This result will
enable a refined determination of the pi^+ pi^+ pi^+ interaction from lattice
QCD calculations.


title: On the Polar Field Distribution as Observed by SOLIS

abstract:
  We use Vector Spectromagnetograph (VSM) chromospheric full-disk magnetograms,
from the Synoptic Optical Long-term Investigations of the Sun (SOLIS) project,
to study the distribution of magnetic field flux concentrations within the
polar caps. We find that magnetic flux elements preferentially appear toward
lower latitudes within the polar caps away from the poles. This has
implications on numerous solar phenomena such as the formation and evolution of
fine polar coronal structures (i.e., polar plumes). Our results also have
implications for the processes carrying the magnetic flux from low to high
latitudes (e.g., meridional circulation).


title:
Melting at dislocations and grain boundaries: A Phase Field Crystal
  study

abstract:
  Dislocation and grain boundary melting are studied in three dimensions using
the Phase Field Crystal method. Isolated dislocations are found to melt
radially outward from their core, as the localized excess elastic energy drives
a power law divergence in the melt radius. Dislocations within low-to-mid angle
grain boundaries melt similarly until an angle-dependent first order wetting
transition occurs when neighboring melted regions coalesce. High angle
boundaries are treated within a screening approximation, and issues related to
ensembles, metastability, and grain size are discussed.


title:
On the Relationship Between a CME Associated Waves Observed on 5 March
  2000

abstract:
  We study the relationship between different wave phenomena associated with a
coronal mass ejection (CME) observed on 05 Mar. 2000. EIT waves were observed
in the images recorded by EIT at 195 {\AA}. The white-light LASCO/C2 images
show clear deflection and propagation of a kink along with the CME.
Spectroscopic observations recorded by the UVCS reveals excessive line
broadening in the two O {\sc{vi}} lines (1032 and 1037 {\AA}). Moreover very
hot lines such as Si {\sc{xii}} and Mg {\sc{x}} were observed. Interestingly,
the EIT wave, the streamer deflection and the intensity modulation along the
slit were all propagating North-East. Spatial and temporal correlations show
that the streamer deflection and spectral line broadening are highly likely to
be due to a CME-driven shock wave and that the EIT wave is the signature of a
CME-driven shock wave in the lower corona.


title: Lifting Group Actions and Nonnegative Curvature

abstract:
  We show that all vector bundles over CP^2 which are not spin admit a complete
metric with nonnegative sectional curvature. In the proof we construct a
nonnegatively curved metric on the corresponding principle bundle by showing
that it admits a cohomogeneity one action with singular orbits of codimension
2. This is closely related to the problem of when an action of G on the base of
an L principle bundle lifts to the total space, such that the lift commutes
with L. We solve this lifting problem for all SO(k) principle bundles over a
4-dimensional simply connected base B with G a cohomogeneity one action on B.


title: The strongest size in the inverse Hall-Petch relationship

abstract:
  Incorporating the bond-order-length-strength correlation mechanism [Sun CQ,
Prog Solid State Chem 35, 1 -159 (2007)] and Borns criterion for melting [J.
Chem. Phys. 7, 591(1939)] into the conventional Hall-Petch relationship has
turned out an analytical expression for the size and temperature dependence of
the mechanical strength of nanograins, known as the inverse Hall-Petch
relationship (IHPR), that has long been a topic under debate regarding the
possible mechanisms. Reproduction of the measured IHPR of Ni, NiP and TiO2
nanocrystals revealed that: (i) the size induced energy densification and
cohesive energy loss of nanograins originates the IHPR that could be activated
in the contact mode of plastic deformation detection; (ii) the competition
between the inhibition of atomic dislocations, via the surface energy density
gain and the strain work hardening, and the activation for dislocations through
cohesive energy loss determine the entire IHPR profile of a specimen; (iii) the
presence of a soft quasisolid phase is responsible for the size-induced
softening and the superplasticity as well of nanostructures; (iv) the bond
nature involved and the T/Tm ratio between the temperature of operating and the
temperature of melting dictate the measured strongest sizes of a given
specimen.


title: Thermally driven elastic weakening of crystals

abstract:
  An analytical solution has been developed clarifying that the thermally
driven elastic softening of crystals can be directly related to the length and
strength of the representative bonds of the crystal and to the response of the
bonding identities to the change of temperature. Reproduction of the
experimental results Ag, Au, MgO, Mg2SO4, Al2O3, and KCl derived mean atomic
cohesive energy of the specimen may evidence the validity of the proposed
approach without involving parameters using in classical thermodynamics.


title: Pressure-stiffened Raman Phonons in Group III Nitrides

abstract:
  It has long been puzzling regarding the atomistic origin of the
pressure-induced Raman phonon stiffening that generally follows a polynomial
expression with coefficients needing physical indication. Here we show that an
extension of the bond-order-length-strength (BOLS) correlation mechanism to the
pressure domain has led to an analytical solution to connect the
pressure-induced Raman phonon stiffening directly to the bonding identities of
the specimen and the response of the bonding identities to the applied
stimulus. It is found that the pressure-induced blue-shift of Raman phonons
arises from the bond compression and energy storage exerted by the compressive
stress. Agreement between predictions and experimental measurement leads to the
detailed form for the polynomial coefficients, which offer an atomic
understanding of the physical mechanism of the external pressure induced energy
gain, thermally induced bond expansion as well as means of determining the mode
atomic cohesive energy in a specimen.


title:
An approach to local band average for the temperature dependence of
  lattice thermal expansion

abstract:
  It has long been puzzling regarding the mechanism behind the nonlinearity of
lattice thermal expansion at low temperatures despite modeling considerations
from various perspectives in classical or quantum approximations. An analytical
solution in terms of local bond average is presented herewith showing that the
thermal expansion coefficient follows closely the specific heat of Debye
approximation without the involvement of mode Gruneisen constant or the bulk
modulus. Matching predictions to experimental observations using the Debye
temperature and the atomic cohesive energy as input evidences that the current
approach may represent the true situation of temperature induced lattice
expansion though the exact form of phonon density of states need to be
considered for further refinement.


title:
Nanocavity hardening: impact of broken bonds at the negatively curved
  surfaces

abstract:
  It is expected that atomic vacancies or nanometric cavities reduce the number
of chemical bonds of nearby atoms and hence the strength of a voided solid.
However, the hardness of a porous specimen does not always follow this simple
picture of coordination counting. An introduction of a certain amount of atomic
vacancies or nanocavities could, instead, enhance the mechanical strength of
the porous specimen. Understanding the mechanism behind the intriguing
observations remains yet a high challenge. Here we show with analytical
expressions that the shortened and strengthened bonds between the
under-coordinated atoms and the associated local strain and energy trapping
[Sun, Prog Solid State Chem 35, 1-159 (2007)] in the negatively curved surface
skins dominate the observed nanocavity hardening. Agreement between predictions
and the experimentally observed size-dependence of mechanical strength of some
nanoporous materials evidences for the proposed mechanism.


title:
Stimulus dependence of the collective vibration of atoms in an
  icosahedral cluster

abstract:
  Molecular dynamics calculations of the vibrational behavior of atoms in a
Lennard-Jones 147-atom cluster revealed that the relaxation and the stability
of the collective vibration of atoms in the cluster depend on the extent of the
mechanical disturbance. A relatively larger-scale perturbation will cause a
faster decay of the vibration magnitude, the potential and the kinetic energy
compared to the vibration stimulated by a small-scale stimulus.


title: Shell-resolved melting kinetics of an icosahedral cluster

abstract:
  Molecular dynamics calculations of the fluctuation of bond vibration revealed
the shell-resolved kinetics of surface melting of closed-shelled cluster
containing 147atoms with Lennard-Jones type interaction. It is found that the
surface melting is imitated by the migrating of the vertex atoms and the
melting process can be divided into three major stages, i.e., vertex migrating,
surface melting, and general melting. Although the melting process of the LJ147
cluster could be divided into discrete stages of shell-by-shell surface
melting, in general, there is still a continuous process of melting from the
surface to the core interior.


title: The kinetics and modes of gold nanowire breaking

abstract:
  Molecular dynamics calculations revealed that the temperature of operation
and the applied tensile force (f) determine not only the kinetics but also the
mode and duration of Au nanowire breaking. In the tensile force range of 0.018
and 0.1 nN/atom, structure transformation of the wire occurs prior to breaking
at random positions. The gold wire breaks abruptly when the f is stronger than
0.1nN/atom but no rupture occurs at all when the f is weaker than 0.018
nN/atom. At higher temperatures and under stronger tensile forces, the wire
breaks even faster.


title:
Search for Matter-Dependent Atmospheric Neutrino Oscillations in
  Super-Kamiokande

abstract:
  We consider muon neutrino to tau neutrino oscillations in the context of the
Mass Varying Neutrino (MaVaN) model, where the neutrino mass can vary depending
on the electron density along the flight path of the neutrino. Our analysis
assumes a mechanism with dependence only upon the electron density, hence
ordinary matter density, of the medium through which the neutrino travels.
Fully-contained, partially-contained and upward-going muon atmospheric neutrino
data from the Super--Kamiokande detector, taken from the entire SK--I period of
1489 live days, are compared to MaVaN model predictions. We find that, for the
case of 2-flavor oscillations, and for the specific models tested, oscillation
independent of electron density is favored over density dependence. Assuming
maximal mixing, the best-fit case and the density-independent case do not
differ significantly.


title: A Note on Banach Principle for JW-algebras

abstract:
  In the sequel we establish the Banach Principle for semifinite JW-algebras
without direct summand of type I sub 2, which extends the recent results of
Chilin and Litvinov on the Banach Principle for semifinite von Neumann algebras
to the case of JW-algebras.


title:
Photoproduction off the nucleon revisited: Evidence for a narrow N(1688)
  resonance?

abstract:
  Revised analysis of $\Sigma$ beam asymmetry for the $\eta$ photoproduction on
the free proton reveals a structure at $W\sim 1.69$ GeV. Fit of the
experimental data based on the E429 solution of the SAID partial wave analysis
suggests a narrow ($\Gamma \leq 25$ MeV) resonance. Possible candidates are
$P_{11}, P_{13}$, or $D_{13}$ resonances. The result is considered in
conjunction with the recent evidence for a bump-like structure at $W\sim 1.67 -
1.68$ GeV in the quasi-free $\eta$ photoproduction on the neutron.


title: Large magnetothermal conductivity in GdBaCo_{2}O_{5+x} single crystals

abstract:
  To study the effects of paramagnetic spins on phonons, both the in-plane and
the c-axis heat transport of GdBaCo_{2}O_{5+x} (GBCO) single crystals are
measured at low temperature down to 0.36 K and in magnetic field up to 16 T. It
is found that the phonon heat transport is very strongly affected by the
magnetic field and nearly 5 times increase of the thermal conductivity in
several Tesla field is observed at 0.36 K. It appears that phonons are
resonantly scattered by paramagnetic spins in zero field and the application of
magnetic field removes such strong scattering, but the detailed mechanism is to
be elucidated.


title: The Distance of GRB is Independent from the Redshift

abstract:
  Although it is acknowledged that GRB redshift is cosmological at present, but
it in fact has never been confirmed. However, the fact is still unclear because
which may be cosmological redshift (including possibly the host galaxy redshift
or the background galaxy redshift) or the redshift results from gravity of
neutron star; in other words, GRB redshift may be related to its distance or
not. Here, I enumerate a series of evidences, including three methods, to
determine whether the GRB distance does depend on the redshift. Firstly, the
correlation analysis shows that there is no correlation between the fluence of
131 GRBs (and the 1 s peak photon flux of 111 GRBs) and the redshift although
there is a significant correlation between the apparent magnitude of 32 hosts
and the redshift. Secondly, from the number-redshift relation of GRBs and the
deductive reasoning, one can deduce an absurd conclusion that the probability
of a nearby galaxy generating a GRB event would vary inversely as its distance
square if GRB indeed comes from an external galaxy and the distance depends on
the redshift. Thirdly, if the distance is related to the redshift, then the
variables of fluence and peak flux definitely cannot be separated from the
variable of redshift in distribution functions of both the fluence-redshift and
the peak flux-redshift; while the variables separation tests show that they in
effect do, and we then can exactly forecast the values of the fluence and the
peak flux for the GRBs with redshift z > 4.5. Other evidences all show that GRB
distance is independent from the redshift without exception.


title:
Magnetic domain wall propagation in a submicron spin-valve stripe:
  influence of the pinned layer

abstract:
  The propagation of a domain wall in a submicron ferromagnetic spin-valve
stripe is investigated using giant magnetoresistance. A notch in the stripe
efficiently traps an injected wall stopping the domain propagation. The authors
show that the magnetic field at which the wall is depinned displays a
stochastic nature. Moreover, the depinning statistics are significantly
different for head to head and tail-to-tail domain walls. This is attributed to
the dipolar field generated in the vicinity of the notch by the pinned layer of
the spin-valve.


title:
Doping evolution of the electronic structure in the single-layer
  cuprates Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$: Comparison with other
  single-layer cuprates

abstract:
  We have performed angle-resolved photoemission and core-level x-ray
photoemission studies of the single-layer cuprate
Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ (Bi2201) and revealed the doping
evolution of the electronic structure from the lightly-doped to optimally-doped
regions. We have observed the formation of the dispersive quasi-particle band,
evolution of the Fermi ``arc'' into the Fermi surface and the shift of the
chemical potential with hole doping as in other cuprates. The doping evolution
in Bi2201 is similar to that in Ca$_{2-x}$Na$_{x}$CuO$_{2}$Cl$_2$ (Na-CCOC),
where a rapid chemical potential shift toward the lower Hubbard band of the
parent insulator has been observed, but is quite different from that in
La$_{2-x}$Sr$_{x}$CuO$_{4}$ (LSCO), where the chemical potential does not
shift, yet the dispersive band and the Fermi arc/surface are formed around the
Fermi level already in the lightly-doped region. The (underlying) Fermi surface
shape and band dispersions are quantitatively analyzed using tight-binding fit,
and the deduced next-nearest-neighbor hopping integral $t'$ also confirm the
similarity to Na-CCOC and the difference from LSCO.


title: Finite-width effects on Delta baryons in QCD Sum Rules

abstract:
  The quantum chromodynamics (QCD) sum rules for the Delta baryons are analyzed
by taking into account the finite-width effects, through explicit utilization
of the Breit-Wigner shape. We apply a Monte-Carlo based analysis to the
'traditional' and the parity-projected sum rules. The first Delta excitation
state is also considered as a sub-continuum resonance and the widths are
calculated using the mass values as input.


title: Blurred femtoscopy in two-proton decay

abstract:
  We study the effects of final state interactions in two-proton emission by
nuclei. Our approach is based on the solution the time-dependent Schr\"odinger
equation. We show that the final relative energy between the protons is
substantially influenced by the final state interactions. We also show that
alternative correlation functions can be constructed showing large sensitivity
to the spin of the diproton system.


title: Acoustically Enhanced Boiling Heat Transfer

abstract:
  An acoustic field is used to increase the critical heat flux (CHF) of a
flat-boiling-heat-transfer surface. The increase is a result of the acoustic
effects on the vapor bubbles. Experiments are performed to explore the effects
of an acoustic field on vapor bubbles in the vicinity of a rigid-heated wall.
Work includes the construction of a novel heater used to produce a single vapor
bubble of a prescribed size and at a prescribed location on a flatboiling
surface for better study of an individual vapor bubble's reaction to the
acoustic field. Work also includes application of the results from the
single-bubble heater to a calibrated-copper heater used for quantifying the
improvements in CHF.


title: Sifting Function Partition for the Goldbach Problem

abstract:
  All sieve methods for the Goldbach problem sift out all the composite
numbers; even though, strictly speaking, it is not necessary to do so and which
is, in general, very difficult. Some new methods introduced in this paper show
that the Goldbach problem can be solved under sifting out only some composite
numbers. In fact, in order to prove the Goldbach conjecture, it is only
necessary to show that there are prime numbers left in the residual integers
after the initial sifting! This idea can be implemented by using one of the
three methods called sifting function partition by integer sort, sifting
function partition by intervals and comparative sieve method, respectively.
These are feasible methods for solving both the Goldbach problem and the
problem of twin primes. An added bonus of the above methods is the elimination
of the indeterminacy of the sifting functions brought about by their upper and
lower bounds.


title: Aging phenomena in polystyrene thin films

abstract:
  The aging behavior is investigated for thin films of atactic polystyrene
through measurements of complex electric capacitance. During isothermal aging
process the real part of the electric capacitance increases with aging time,
while the imaginary part decreases with aging time. This result suggests that
the aging time dependence of the real and imaginary parts are mainly associated
with change in thickness and dielectric permittivity, respectively. In thin
films, the thickness depends on thermal history of aging even above the glass
transition. Memory and `rejuvenation' effects are also observed in the thin
films.


title:
Non-Equilibrium Heavy Flavored Hadron Yields from Chemical Equilibrium
  Strangeness-Rich QGP

abstract:
  The yields of heavy flavored hadrons emitted from strangeness-rich QGP are
evaluated within chemical non-equilibrium statistical hadronization model,
conserving strangeness, charm, and entropy yields at hadronization.


title:
Frequency-up conversion and quantum swap gate in an optical cavity with
  atomic cloud

abstract:
  A scheme is presented for realizing frequency-up conversion and a two-qubit
quantum swap gate for intracavity fields. In the scheme, a V-type atomic
ensemble prepared in their ground states collectively mediates the interaction
between the two cavity modes. Under certain conditions, the cavity-field degree
of freedom is decoupled from the atomic degrees of freedom, and the effective
coupling strength between the two cavity modes scales up with $\sqrt{N}$ ($N$
is the number of atoms). The numerical simulation shows that the quantum swap
gate still has a high fidelity under the influence of the atomic spontaneous
emission and the decay of the cavity modes.


title:
Glass transition and alpha-relaxation dynamics of thin films of labeled
  polystyrene

abstract:
  The glass transition temperature and relaxation dynamics of the segmental
motions of thin films of polystyrene labeled with a dye,
4-[N-ethyl-N-(hydroxyethyl)]amino-4-nitraozobenzene (Disperse Red 1, DR1) are
investigated using dielectric measurements. The dielectric relaxation strength
of the DR1-labeled polystyrene is approximately 65 times larger than that of
the unlabeled polystyrene above the glass transition, while there is almost no
difference between them below the glass transition. The glass transition
temperature of the DR1-labeled polystyrene can be determined as a crossover
temperature at which the temperature coefficient of the electric capacitance
changes from the value of the glassy state to that of the liquid state. The
glass transition temperature of the DR1-labeled polystyrene decreases with
decreasing film thickness in a reasonably similar manner to that of the
unlabeled polystyrene thin films. The dielectric relaxation spectrum of the
DR1-labeled polystyrene is also investigated. As thickness decreases, the
$\alpha$-relaxation time becomes smaller and the distribution of the
$\alpha$-relaxation times becomes broader. These results show that thin films
of DR1-labeled polystyrene are a suitable system for investigating confinement
effects of the glass transition dynamics using dielectric relaxation
spectroscopy.


title: Variational wavefunction study of the triangular lattice supersolid

abstract:
  We present a variational wavefunction which explains the behaviour of the
supersolid state formed by hard-core bosons on the triangular lattice. The
wavefunction is a linear superposition of {\em only and all} configurations
minimising the repulsion between the bosons (which it thus implements as a hard
constraint). Its properties can be evaluated exactly--in particular, the
variational minimisation of the energy yields (i) the surprising and initially
controversial spontaneous density deviation from half-filling (ii) a
quantitatively accurate estimate of the corresponding density wave (solid)
order parameter.


title:
Long-term temporal dependence of droplets transiting through a fixed
  spatial point in gas-liquid twophase turbulent jets

abstract:
  We perform rescaled range analysis upon the signals measured by Dual Particle
Dynamical Analyzer in gas-liquid two-phase turbulent jets. A novel rescaled
range analysis is proposed to investigate these unevenly sampled signals. The
Hurst exponents of velocity and other passive scalars in the bulk of spray are
obtained to be 0.59$\pm $0.02 and the fractal dimension is hence 1.41$\pm $
0.02, which are in remarkable agreement with and much more precise than
previous results. These scaling exponents are found to be independent of the
configuration and dimensions of the nozzle and the fluid flows. Therefore, such
type of systems form a universality class with invariant scaling properties.


title: An Upper Limit on Gas Production from 3200 Phaethon

abstract:
  Asteroid 3200 Phaethon resembles a comet in some ways, including a
highly-eccentric orbit (e=0.89) and a strong associated meteor shower (the
Geminids). Yet this object has never been observed to exhibit any cometary
activity, i.e., gas production. We observed 3200 Phaethon with the Caltech
Submillimeter Observatory on two occasions, once while it was near its closest
approach to Earth as it neared perihelion, and another while it was further
from Earth post-perihelion. Observations of the J=2-1 and J=3-2 rotational
transitions of 12CO, typically strong lines in comets and indicative of gas
production, yielded no detection. Upper limits on the 12CO production of 1.8e28
molecules/s and 7.6e28 molecules/s for Phaethon were determined on these two
occasions.


title:
Crossover of aging dynamics in polymer glass: from cumulative aging to
  non-cumulative aging

abstract:
  The aging behavior of polymer glass, poly(methyl methacrylate), has been
investigated through the measurement of ac dielectric susceptibility ata fixed
frequency after a temperature shift $\Delta T$ ($\le $ 20 K)between two
temperatures, $T_1$ and $T_2$. A crossover from cumulative aging to
non-cumulative aging could be observed with increasing $\Delta T$ using a twin
temperature ($T$-) shift measurement. Based on a growth law of a dynamical
coherent length given by activated dynamics, we obtained a unique coherent
length for positive and negative $T$-shifts. The possibility of the existence
of temperature chaos in polymer glasses is discussed.


title: Glassy dynamics in thin films of polystyrene

abstract:
  Glassy dynamics was investigated for thin films of atactic polystyrene by
complex electric capacitance measurements using dielectric relaxation
spectroscopy. During the isothermal aging process the real part of the electric
capacitance increased with time, whereas the imaginary part decreased with
time. It follows that the aging time dependences of real and imaginary parts of
the electric capacitance were primarily associated with change in volume (film
thickness) and dielectric permittivity, respectively. Further, dielectric
permittivity showed memory and rejuvenation effects in a similar manner to
those observed for poly(methyl methacrylate) thin films. On the other hand,
volume did not show a strong rejuvenation effect.


title:
Pattern formation of a predator-prey system with Ivlev-type functional
  response

abstract:
  In this paper, we investigate the emergence of a predator-prey system with
Ivlev-type functional response and reaction-diffusion. We study how diffusion
affects the stability of predator-prey coexistence equilibrium and derive the
conditions for Hopf and Turing bifurcation in the spatial domain. Based on the
bifurcation analysis, we give the spatial pattern formation, the evolution
process of the system near the coexistence equilibrium point, via numerical
simulation. We find that pure Hopf instability leads to the formation of spiral
patterns and pure Turing instability destroys the spiral pattern and leads to
the formation of chaotic spatial pattern. Furthermore, we perform three
categories of initial perturbations which predators are introduced in a small
domain to the coexistence equilibrium point to illustrate the emergence of
spatiotemporal patterns, we also find that in the beginning of evolution of the
spatial pattern, the special initial conditions have an effect on the formation
of spatial patterns, though the effect is less and less with the more and more
iterations. This indicates that for prey-dependent type predator-prey model,
pattern formations do depend on the initial conditions, while for
predator-dependent type they do not. Our results show that modeling by
reaction-diffusion equations is an appropriate tool for investigating
fundamental mechanisms of complex spatiotemporal dynamics.


title:
Spatiotemporal pattern formation of Beddington-DeAngelis-type
  predator-prey model

abstract:
  In this paper, we investigate the emergence of a predator-prey model with
Beddington-DeAngelis-type functional response and reaction-diffusion. We derive
the conditions for Hopf and Turing bifurcation on the spatial domain. Based on
the stability and bifurcation analysis, we give the spatial pattern formation
via numerical simulation, i.e., the evolution process of the model near the
coexistence equilibrium point. We find that for the model we consider, pure
Turing instability gives birth to the spotted pattern, pure Hopf instability
gives birth to the spiral wave pattern, and both Hopf and Turing instability
give birth to stripe-like pattern. Our results show that reaction-diffusion
model is an appropriate tool for investigating fundamental mechanism of complex
spatiotemporal dynamics. It will be useful for studying the dynamic complexity
of ecosystems.


title: On the monochromatic Schur Triples type problem

abstract:
  We discuss a problem posed by Ronald Graham about the minimum number, over
all 2-colorings of $[1,n]$, of monochromatic $\{x,y,x+ay\}$ triples for $a \geq
1$. We give a new proof of the original case of $a=1$. We show that the minimum
number of such triples is at most $\frac{n^2}{2a(a^2+2a+3)} + O(n)$ when $a
\geq 2$. We also find a new upper bound for the minimum number, over all
$r$-colorings of $[1,n]$, of monochromatic Schur triples, for $r \geq 3$.


title: The Aharonov-Bohm effect: the role of tunneling and associated forces

abstract:
  Through tunneling, or barrier penetration, small wavefunction tails can enter
a finitely shielded cylinder with a magnetic field inside. When the shielding
increases to infinity the Lorentz force goes to zero together with these tails.
However, it is shown, by considering the radial derivative of the wavefunction
on the cylinder surface, that a flux dependent force remains. This force
explains in a natural way the Aharonov-Bohm effect in the idealized case of
infinite shielding.


title: Kaon HBT radii from perfect fluid dynamics using the Buda-Lund model

abstract:
  In this paper we summarize the ellipsoidally symmetric Buda-Lund model's
results on HBT radii. We calculate the Bose-Einstein correlation function from
the model and derive formulas for the transverse momentum dependence of the
correlation radii in the Bertsch-Pratt system of out, side and longitudinal
directions. We show a comparison to $\sqrt{s_{\rm NN}}=200 GeV$ RHIC PHENIX
two-pion correlation data and make prediction on the same observable for
different particles.


title: Gravity Trapping on a Finite Thickness Domain Wall: An Analytic Study

abstract:
  We construct an explicit model of gravity trapping domain wall potential
where for the first time we can study explicitly the graviton wave function
fluctuations for any thickness of the domain wall. A concrete form of the
potential depends on one parameter 0 <= x <= pi/2, which effectively
parameterizes the thickness of the domain wall with specific limits x -> 0 and
x -> pi/2 corresponding to the thin and the thick wall, respectively. The
analysis of the continuum Kaluza Klein fluctuations yields explicit expressions
for both the small and large Kaluza Klein energy. We also derive specific
explicit conditions in the regime x > 1, for which the fluctuation modes
exhibit a resonance behaviour, and which could sizably affect the modifications
of the four-dimensional Newton's law at distances, which typically are by four
orders of magnitude larger than those relevant for Newton's law modifications
of thin walls.


title: A Novel Synthesis Algorithm for Reversible Circuits

abstract:
  In this paper, a new non-search based synthesis algorithm for reversible
circuits is proposed. Compared with the widely used search-based methods, our
algorithm is guarantied to produce a result and can lead to a solution with
much fewer steps. To evaluate the proposed method, several circuits taken from
the literature are used. The experimental results corroborate the expected
findings.


title:
Equivariant Ricci flow with surgery and applications to finite group
  actions on geometric 3-manifolds

abstract:
  We apply an equivariant version of Perelman's Ricci flow with surgery to
study smooth actions by finite groups on closed 3-manifolds. Our main result is
that such actions on elliptic and hyperbolic 3-manifolds are conjugate to
isometric actions. Combining our results with results by Meeks and Scott [17],
it follows that such actions on geometric 3-manifolds (in the sense of
Thurston) are always geometric, i.e. there exist invariant locally homogeneous
Riemannian metrics. This answers a question posed by Thurston in [32].


title: From Cherenkov Radiation to Generalized Super-Cherenkov Exotic Decays

abstract:
  Generalized Super-Cherenkov Radiations (SCR), as well as their SCR-signatures
are investigated. Two general SCR-coherence conditions are found as two natural
extremes of the same spontaneous particles decays in (dielectric, nuclear or
hadronic) media. The main results on the experimental test of the
super-coherence conditions, obtained by using the experimental data from BNL,
are presented. The interpretation of the observed anomalous Cherenkov rings as
experimental evidence for the HE-component of the SCR is discussed.


title: One curious proof of Fermat's little theorem

abstract:
  We give a proof of Fermat's little theorem which does not use nor
arithmetic(Euclidean algorithm) neither algebra (group theory), but it rather
employs the field of the formal power series Q((x)). The note is an example of
a mathematical joke, though it contains a rigorous proof. (The paper will
appear in print exactly as in the version v3).


title: Soliton solutions for Q3

abstract:
  We construct N-soliton solutions to the equation called Q3 in the recent
Adler-Bobenko-Suris classification. An essential ingredient in the construction
is the relationship of $(Q3)_{\delta=0}$ to the equation proposed by Nijhoff,
Quispel and Capel in 1983 (the NQC equation). This latter equation has two
extra parameters, and depending on their sign choices we get a 4-to-1
relationship from NQC to $(Q3)_{\delta=0}$. This leads to a four-term
background solution, and then to a 1-soliton solution using a Backlund
transformation. Using the 1SS as a guide allows us to get the N-soliton
solution in terms of the tau-function of the Hirota-Miwa equation.


title:
The parametrization of the Marchenko-Ostrovsky mapping in terms of the
  Dirichlet eigenvalues

abstract:
  We consider the inverse spectral problem for periodic Jacobi matrices in
terms of the vertical slits on the quasi-momentum domain plus the Dirichlet
eigenvalues, i.e., the Marchenko-Ostrovsky mapping. Moreover, we show that the
gradients of the Dirichlet eigenvalues and of the so-called norming constants
are linear independent.


title: Non-Abelian Vortices on Riemann Surfaces: an Integrable Case

abstract:
  We consider U(n+1) Yang-Mills instantons on the space \Sigma\times S^2, where
\Sigma is a compact Riemann surface of genus g. Using an SU(2)-equivariant
dimensional reduction, we show that the U(n+1) instanton equations on
\Sigma\times S^2 are equivalent to non-Abelian vortex equations on \Sigma.
Solutions to these equations are given by pairs (A,\phi), where A is a gauge
potential of the group U(n) and \phi is a Higgs field in the fundamental
representation of the group U(n). We briefly compare this model with other
non-Abelian Higgs models considered recently. Afterwards we show that for g>1,
when \Sigma\times S^2 becomes a gravitational instanton, the non-Abelian vortex
equations are the compatibility conditions of two linear equations (Lax pair)
and therefore the standard methods of integrable systems can be applied for
constructing their solutions.


title: Symmetric subgroups in modular group algebras

abstract:
  Let V(KG) be a normalised unit group of the modular group algebra of a finite
p-group G over the field K of p elements. We introduce a notion of symmetric
subgroups in V(KG) as subgroups invariant under the action of the classical
involution of the group algebra KG. We study properties of symmetric subgroups
and construct a counterexample to the conjecture by V.Bovdi, which states that
V(KG)=<G,S*>, where S* is a set of symmetric units of V(KG).


title: Noncommutative field gas driven inflation

abstract:
  We investigate early time inflationary scenarios in an Universe filled with a
dilute noncommutative bosonic gas at high temperature. A noncommutative bosonic
gas is a gas composed of bosonic scalar field with noncommutative field space
on a commutative spacetime. Such noncommutative field theories was recently
introduced as a generalization of quantum mechanics on a noncommutative
spacetime. As key features of these theories are Lorentz invariance violation
and CPT violation. In the present study we use a noncommutative bosonic field
theory that besides the noncommutative parameter $\theta$ shows up a further
parameter $\sigma$. This parameter $\sigma$ controls the range of the
noncommutativity and acts as a regulator for the theory. Both parameters play a
key role in the modified dispersion relations of the noncommutative bosonic
field, leading to possible striking consequences for phenomenology. In this
work we obtain an equation of state $p=\omega(\sigma,\theta;\beta)\rho$ for the
noncommutative bosonic gas relating pressure $p$ and energy density $\rho$, in
the limit of high temperature. We analyse possible behaviours for this gas
parameters $\sigma$, $\theta$ and $\beta$, so that $-1\leq\omega<-1/3$, which
is the region where the Universe enters an accelerated phase.


title:
The 6dF Galaxy Survey: a low-redshift benchmark for bulge-dominated
  galaxies

abstract:
  The 6dF Galaxy Survey provides a very large sample of galaxies with reliable
measurements of Lick line indices and velocity dispersions. This sample can be
used to explore the correlations between mass and stellar population parameters
such as age, metallicity and [alpha/Fe]. Preliminary results from such an
analysis are presented here, and show that age and metallicity are
significantly anti-correlated for both passive and star-forming galaxies.
Passive galaxies have strong correlations between mass and metallicity and
between age and alpha-element over-abundance, which combine to produce a
downsizing relation between age and mass. For old passive galaxies, the
different trends of M/L with mass and luminosity in different passbands result
from the differential effect of the mass-metallicity relation on the
luminosities in each passband. Future work with this sample will examine the
Fundamental Plane of bulge-dominated galaxies and the influence of environment
on relations between stellar population parameters and mass.


title:
Analysis of the physical Laplacian and the heat flow on a locally finite
  graph

abstract:
  We study the physical Laplacian and the corresponding heat flow on an
infinite, locally finite graph with possibly unbounded valence.


title:
A linear-non-linear model for a computational call-by-value lambda
  calculus (extended abstract)

abstract:
  We give a categorical semantics for a call-by-value linear lambda calculus.
Such a lambda calculus was used by Selinger and Valiron as the backbone of a
functional programming language for quantum computation. One feature of this
lambda calculus is its linear type system, which includes a duplicability
operator "!" as in linear logic. Another main feature is its call-by-value
reduction strategy, together with a side-effect to model probabilistic
measurements. The "!" operator gives rise to a comonad, as in the linear logic
models of Seely, Bierman, and Benton. The side-effects give rise to a monad, as
in Moggi's computational lambda calculus. It is this combination of a monad and
a comonad that makes the present paper interesting. We show that our
categorical semantics is sound and complete.


title: Information on the structure of the a1 from tau decay

abstract:
  The decay $\tau\to \pi\pi\pi\nu$ is analysed using different methods to
account for the resonance structure, which is usually ascribed to the a1. One
scenario is based on the recently developed techniques to generate axial-vector
resonances dynamically, whereas in a second calculation the a1 is introduced as
an explicit resonance. We investigate the influence of different assumptions on
the result. In the molecule scenario the spectral function is described
surprisingly well by adjusting only one free parameter. This result can be
systematically improved by adding higher order corrections to the iterated
Weinberg-Tomozawa interaction. Treating the a1 as an explicit resonance on the
other hand leads to peculiar properties.


title: Joint Wyner-Ziv/Dirty Paper coding by modulo-lattice modulation

abstract:
  The combination of source coding with decoder side-information (Wyner-Ziv
problem) and channel coding with encoder side-information (Gel'fand-Pinsker
problem) can be optimally solved using the separation principle. In this work
we show an alternative scheme for the quadratic-Gaussian case, which merges
source and channel coding. This scheme achieves the optimal performance by a
applying modulo-lattice modulation to the analog source. Thus it saves the
complexity of quantization and channel decoding, and remains with the task of
"shaping" only. Furthermore, for high signal-to-noise ratio (SNR), the scheme
approaches the optimal performance using an SNR-independent encoder, thus it is
robust to unknown SNR at the encoder.


title:
The context of the Local Volume: structures and motions in the nearby
  universe

abstract:
  The 6dF Galaxy Survey (6dFGS) and the 2MASS Redshift Survey (2MRS) provide
the most complete maps of the large-scale structures and motions in the nearby
universe. These maps have been used to reconstruct the density field in the
local volume, and to predict the corresponding velocity field and the dipole of
the Local Group motion.


title:
Combination of Thermal Subsystems Modelled by Rapid Circuit
  Transformation

abstract:
  This paper will deal with the modeling-problem of combining thermal
subsystems (e.g. a semiconductor module or package with a cooling radiator)
making use of reduced models. The subsystem models consist of a set of
Foster-type thermal equivalent circuits, which are only behavioral models. A
fast al-gorithm is presented for transforming the Foster-type circuits in
Cauer-circuits which have physical behavior and therefore allow for the
construction of the thermal model of the complete system. Then the set of
Cauer-circuits for the complete system is transformed back into Foster-circuits
to give a simple mathematical representation and applicability. The
transfor-mation algorithms are derived in concise form by use of recur-sive
relations. The method is exemplified by modeling and measurements on a single
chip IGBT package mounted on a closed water cooled radiator. The thermal
impedance of the complete system is constructed from the impedances of the
sub-systems, IGBT-package and radiator, and also the impedance of the package
can be inferred from the measured impedance of the complete system.


title: The Strangeness Physics Program at CLAS

abstract:
  An extensive program of strange particle production off the nucleon is
currently underway with the CEBAF Large Acceptance Spectrometer (CLAS) in Hall
B at Jefferson Laboratory. This talk will emphasize strangeness
electroproduction in the baryon resonance region between W=1.6 and 2.4 GeV,
where indications of s-channel structure are suggestive of high-mass baryon
resonances coupling to kaons and hyperons in the final state. Precision
measurements of cross sections and polarization observables are being carried
out with highly polarized electron and real photon beams at energies up to 6
GeV. The near-term and longer-term future of this program will also be
discussed.


title: Detection of OH absorption against PSR B1718-35

abstract:
  OH absorption against PSR B1718-35 at (l,b) =351.688,+0.671 has been
discovered at 1665 and 1667 MHz using the Green Bank Telescope. The absorption
appears to arise at the interface of an HII region and a molecular cloud which
are likely associated with the high mass star forming region NGC 6334. Beam
dilution is found to be the cause of differences in the opacity of the OH
against the Galactic background continuum emission and against the pulsar. The
OH cloud is approximately 3 by 1.3 pc and is located behind the HII region.


title: Moduli of ADHM Sheaves and Local Donaldson-Thomas Theory

abstract:
  The ADHM construction establishes a one-to-one correspondence between framed
torsion free sheaves on the projective plane and stable framed representations
of a quiver with relations in the category of complex vector spaces. This paper
studies the geometry of moduli spaces of representations of the same quiver
with relations in the abelian category of coherent sheaves on a smooth complex
projective curve $X$. In particular it is proven that this moduli space is
virtually smooth and related byrelative Beilinson spectral sequence to the
curve counting construction via stable pairs of Pandharipande and Thomas. This
yields a new conjectural construction for the local Donaldson-Thomas theory of
curves as well as a natural higher rank generalization.


title: Unified Quantum Convolutional Coding

abstract:
  We outline a quantum convolutional coding technique for protecting a stream
of classical bits and qubits. Our goal is to provide a framework for designing
codes that approach the ``grandfather'' capacity of an entanglement-assisted
quantum channel for sending classical and quantum information simultaneously.
Our method incorporates several resources for quantum redundancy: fresh ancilla
qubits, entangled bits, and gauge qubits. The use of these diverse resources
gives our technique the benefits of both active and passive quantum error
correction. We can encode a classical-quantum bit stream with periodic quantum
gates because our codes possess a convolutional structure. We end with an
example of a ``grandfather'' quantum convolutional code that protects one qubit
and one classical bit per frame by encoding them with one fresh ancilla qubit,
one entangled bit, and one gauge qubit per frame. We explicitly provide the
encoding and decoding circuits for this example.


title: E-Orbit Functions

abstract:
  We review and further develop the theory of $E$-orbit functions. They are
functions on the Euclidean space $E_n$ obtained from the multivariate
exponential function by symmetrization by means of an even part $W_{e}$ of a
Weyl group $W$, corresponding to a Coxeter-Dynkin diagram. Properties of such
functions are described. They are closely related to symmetric and
antisymmetric orbit functions which are received from exponential functions by
symmetrization and antisymmetrization procedure by means of a Weyl group $W$.
The $E$-orbit functions, determined by integral parameters, are invariant with
respect to even part $W^{\rm aff}_{e}$ of the affine Weyl group corresponding
to $W$. The $E$-orbit functions determine a symmetrized Fourier transform,
where these functions serve as a kernel of the transform. They also determine a
transform on a finite set of points of the fundamental domain $F^{e}$ of the
group $W^{\rm aff}_{e}$ (the discrete $E$-orbit function transform).


title: Classification problems for system of forms and linear mappings

abstract:
  We devise a method that reduces the problem of classifying systems of forms
and linear mappings to the problem of classifying systems of linear mappings.
Canonical matrices of
  (i) bilinear or sesquilinear forms,
  (ii) pairs of symmetric, skew-symmetric, or Hermitian forms,
  (iii) isometric or selfadjoint operators on a space with nonsingular
symmetric, or skew-symmetric, or Hermitian form are obtained over any field of
characteristic not 2 up to classification of Hermitian forms over its finite
extensions.