title:
Dynamical transition, hydrophobic interface, and the temperature
  dependence of electrostatic fluctuations in proteins

abstract:
  Molecular dynamics simulations have revealed a dramatic increase, with
increasing temperature, of the amplitude of electrostatic fluctuations caused
by water at the active site of metalloprotein plastocyanin. The increased
breadth of electrostatic fluctuations, expressed in terms of the reorganization
energy of changing the redox state of the protein, is related to the formation
of the hydrophobic protein/water interface allowing large-amplitude collective
fluctuations of the water density in the protein's first solvation shell. On
the top of the monotonic increase of the reorganization energy with increasing
temperature, we have observed a spike at 220 K also accompanied by a
significant slowing of the exponential collective Stokes shift dynamics. In
contrast to the local density fluctuations of the hydration-shell waters, these
spikes might be related to the global property of the water solvent crossing
the Widom line.


title:
Properties of special classes of analytic functions which are
  multipliers of the Cauchy-Stieltjes integrals

abstract:
  Special classes of analytic functions, denoting by K and J arc considered in
this paper.


title:
Thermal fluctuations in moderately damped Josephson junctions: Multiple
  escape and retrapping, switching- and return-current distributions and
  hysteresis

abstract:
  A crossover at a temperature T* in the temperature dependence of the width s
of the distribution of switching currents of moderately damped Josephson
junctions has been reported in a number of recent publications, with positive
ds/dT and IV characteristics associated with underdamped behaviour for lower
temperatures T<T*, and negative ds/dT and IV characteristics resembling
overdamped behaviour for higher temperatures T>T*. We have investigated in
detail the behaviour of Josephson junctions around the temperature T* by using
Monte Carlo simulations including retrapping from the running state into the
supercurrent state as given by the model of Ben-Jacob et al. We develop
discussion of the important role of multiple escape and retrapping events in
the moderate-damping regime, in particular considering the behaviour in the
region close to T*. We show that the behaviour is more fully understood by
considering two crossover temperatures, and that the shape of the distribution
and s(T) around T*, as well as at lower T<T*, are largely determined by the
shape of the conventional thermally activated switching distribution. We show
that the characteristic temperatures T* are not unique for a particular
Josephson junction, but have some dependence on the ramp rate of the applied
bias current. We also consider hysteresis in moderately damped Josephson
junctions and discuss the less commonly measured distribution of return
currents for a decreasing current ramp. We find that some hysteresis should be
expected to persist above T* and we highlight the importance, even well below
T*, of accounting properly for thermal fluctuations when determining the
damping parameter Q.


title: Note on the multipliers of Cauchy integrals of logarithmic potentials

abstract:
  The present note contains a generalization of a theorem of Hallenbeck and
Samotij for the multipliers of Cauchy integrals of logarithmic potentials.


title:
Role of interactions in 87Rb-40K Bose-Fermi mixtures in a 3d optical
  lattice

abstract:
  We investigate the effect of interspecies interaction on a degenerate mixture
of bosonic 87Rb and fermionic 40K atoms in a three-dimensional optical lattice
potential. Using a Feshbach resonance, the 87Rb-40K interaction is tuned over a
wide range. Through an analysis of the 87Rb momentum distribution, we find a
pronounced asymmetry between strong repulsion and strong attraction. In the
latter case, the Bose-Hubbard parameters are renormalized due to self-trapping,
leading to a marked shift in the superfluid to Mott insulator transition with
increasing Bose-Fermi interaction.


title: Bounds on Kolmogorov spectra for the Navier - Stokes equations

abstract:
  Let $u(x,t)$ be a (possibly weak) solution of the Navier - Stokes equations
on all of ${\mathbb R}^3$, or on the torus ${\mathbb R}^3/ {\mathbb Z}^3$. The
{\it energy spectrum} of $u(\cdot,t)$ is the spherical integral \[
  E(\kappa,t) = \int_{|k| = \kappa} |\hat{u}(k,t)|^2 dS(k), \qquad
  0 \leq \kappa < \infty, \] or alternatively, a suitable approximate sum. An
argument involking scale invariance and dimensional analysis given by
Kolmogorov (1941) and Obukhov (1941) predicts that large Reynolds number
solutions of the Navier - Stokes equations in three dimensions should obey \[
  E(\kappa, t) \sim C_0\varepsilon^{2/3}\kappa^{-5/3} \] over an inertial range
$\kappa_1 \leq \kappa \leq \kappa_2$, at least in an average sense. We give a
global estimate on weak solutions in the norm
  $\|{\mathcal F}\partial_x u(\cdot, t)\|_\infty$ which gives bounds on a
solution's ability to satisfy the Kolmogorov law. A subsequent result is for
rigorous upper and lower bounds on the inertial range, and an upper bound on
the time of validity of the Kolmogorov spectral regime.


title: Complementary descriptions of shape/phase transitions in atomic nuclei

abstract:
  Shape/phase transitions in atomic nuclei have first been discovered in the
framework of the Interacting Boson Approximation (IBA) model. Critical point
symmetries appropriate for nuclei at the transition points have been introduced
as special solutions of the Bohr Hamiltonian, stirring the introduction of
additional new solutions describing wide ranges of nuclei. The complementarity
of the IBA and geometrical approaches will be demonstrated by three examples.
First, it will be shown that specific special solutions of the Bohr Hamiltonian
correspond to the borders of the critical region of the IBA. Second, it will be
demonstrated that the distinct patterns exhibited in different transitional
regions by the experimental energy staggering in gamma-bands can be reproduced
both by the IBA and by special solutions of the Bohr Hamiltonian. Third, a
first attempt to obtain a IBA SU(3) level scheme from a special solution of the
Bohr Hamiltonian will be presented.


title: Electromagnetic effects in Kl3 decays

abstract:
  We study the radiative corrections to all Kl3 decay modes to leading
non-trivial order in the chiral effective field theory, working with a fully
inclusive prescription on real photon emission. We present new results for Kmu3
modes and update previous results on Ke3 modes. Our analysis provides important
theoretical input for the extraction of the CKM element Vus from Kl3 decays.


title:
Constraints on large scale inhomogeneities from WMAP-5 and SDSS:
  confrontation with recent observations

abstract:
  Measurements of the SNe Ia Hubble diagram which suggest that the universe is
accelerating due to the effect of dark energy may be biased because we are
located in a 200-300 Mpc underdense "void" which is expanding 20-30% faster
than the average rate. With the smaller global Hubble parameter, the WMAP-5
data on cosmic microwave background anisotropies can be fitted without
requiring dark energy if there is some excess power in the spectrum of
primordial perturbations on 100 Mpc scales. The SDSS data on galaxy clustering
can also be fitted if there is a small component of hot dark matter in the form
of 0.5 eV mass neutrinos. We show however that if the primordial fluctuations
are gaussian, the expected variance of the Hubble parameter and the matter
density are far too small to allow such a large local void. Nevertheless many
such large voids have been identified in the SDSS LRG survey in a search for
the late-ISW effect due to dark energy. The observed CMB temperature decrements
imply that they are nearly empty, thus these real voids too are in gross
conflict with the concordance LCDM model. The recently observed high peculiar
velocity flow presents another challenge for the model. Therefore whether a
large local void actually exists must be tested through observations and cannot
be dismissed a priori.


title: Bers slices are Zariski dense

abstract:
  We prove that every Bers slice of quasi-Fuchsian space is Zariski dense in
the character variety.


title:
Experimental constraints on the astrophysical interpretation of the
  cosmic ray Galactic-extragalactic transition region

abstract:
  The energy region spanning from $\sim 10^{17}$ to $\lesssim 10^{19}$ eV is
critical for understanding both, the Galactic and the extragalactic cosmic ray
fluxes. This is the region where the propagation regime of nuclei inside the
Galactic magnetic environment changes from diffusive to ballistic, as well as
the region where, very likely, the most powerful Galactic accelerators reach
their maximum output energies. In this work, a diffusion Galactic model is used
to analyze the end of the Galactic cosmic ray spectrum and its mixing with the
extragalactic cosmic ray flux. In particular, we study the conditions that must
be met, from the spectral and composition points of view, by the Galactic and
the extragalactic fluxes in order to reproduce simultaneously the total
spectrum and elongation rate measured over the transition region by HiRes and
Auger. Our analysis favors a mixed extragalactic spectrum in combination with a
Galactic spectrum enhanced by additional high energy components, i.e.,
extending beyond the maximum energies expected from regular supernova remnants.
The two additional components have mixed composition, with the lowest energy
one heavier than the highest energy one. The potential impact on the
astrophysical analysis of the assumed hadronic interaction model is also
assessed in detail.


title: Kinetic regulation of coated vesicle secretion

abstract:
  The secretion of vesicles for intracellular transport often rely on the
aggregation of specialized membrane-bound proteins into a coat able to curve
cell membranes. The nucleation and growth of a protein coat is a kinetic
process that competes with the energy-consuming turnover of coat components
between the membrane and the cytosol. We propose a generic kinetic description
of coat assembly and the formation of coated vesicles, and discuss its
implication to the dynamics of COP vesicles that traffic within the Golgi and
with the Endoplasmic Reticulum. We show that stationary coats of fixed area
emerge from the competition between coat growth and the recycling of coat
components, in a fashion resembling the treadmilling of cytoskeletal filaments.
We further show that the turnover of coat components allows for a highly
sensitive switching mechanism between a quiescent and a vesicle producing
membrane, upon a slowing down of the exchange kinetics. We claim that the
existence of this switching behaviour, also triggered by factors such as the
presence of cargo and variation of the membrane mechanical tension, allows for
efficient regulation of vesicle secretion. We propose a model, supported by
different experimental observations, in which vesiculation of secretory
membranes is impaired by the energy consuming desorption of coat proteins,
until the presence of cargo or other factors triggers a dynamical switch into a
vesicle producing state.


title:
Bayesian Selection of sign(mu) within mSUGRA in Global Fits Including
  WMAP5 Results

abstract:
  We study the properties of the constrained minimal supersymmetric standard
model (mSUGRA) by performing fits to updated indirect data, including the relic
density of dark matter inferred from WMAP5. In order to find the extent to
which mu < 0 is disfavoured compared to mu > 0, we compare the Bayesian
evidence values for these models, which we obtain straightforwardly and with
good precision from the recently developed multi-modal nested sampling
('MultiNest') technique. We find weak to moderate evidence for the mu > 0
branch of mSUGRA over mu < 0 and estimate the ratio of probabilities to be P(mu
> 0)/P(mu < 0) = 6-61 depending on the prior measure and range used. There is
thus positive (but not overwhelming) evidence that mu > 0 in mSUGRA. The
MultiNest technique also delivers probability distributions of parameters and
other relevant quantities such as superpartner masses. We explore the
dependence of our results on the choice of the prior measure used. We also use
the Bayesian evidence to quantify the consistency between the mSUGRA parameter
inferences coming from the constraints that have the largest effects: (g-2)_mu,
BR(b -> s gamma) and cold dark matter (DM) relic density Omega_{DM}h^2.


title:
Theory of the optical absorption of light carrying orbital angular
  momentum by semiconductors

abstract:
  We develop a free-carrier theory of the optical absorption of light carrying
orbital angular momentum (twisted light) by bulk semiconductors. We obtain the
optical transition matrix elements for Bessel-mode twisted light and use them
to calculate the wave function of photo-excited electrons to first-order in the
vector potential of the laser. The associated net electric currents of first
and second-order on the field are obtained. It is shown that the magnetic field
produced at the center of the beam for the $\ell=1$ mode is of the order of a
millitesla, and could therefore be detected experimentally using, for example,
the technique of time-resolved Faraday rotation.


title:
Determination of the angular momentum distribution of supernovae from
  gravitational wave observations

abstract:
  Significant progress has been made in the development of an international
network of gravitational wave detectors, such as TAMA300, LIGO, VIRGO, and
GEO600. For these detectors, one of the most promising sources of gravitational
waves are core collapse supernovae especially in our Galaxy. Recent simulations
of core collapse supernovae, rigorously carried out by various groups, show
that the features of the waveforms are determined by the rotational profiles of
the core, such as the rotation rate and the degree of the differential rotation
prior to core-collapse. Specifically, it has been predicted that the sign of
the second largest peak in the gravitational wave strain signal is negative if
the core rotates cylindrically with strong differential rotation. The sign of
the second peak could be a nice indicator that provides us with information
about the angular momentum distribution of the core, unseen without
gravitational wave signals. Here we present a data analysis procedure aiming at
the detection of the second peak using a coherent network analysis and estimate
the detection efficiency when a supernova is at the sky location of the
Galactic center. The simulations showed we were able to determine the sign of
the second peak under an idealized condition of a network of gravitational wave
detectors if a supernova occurs at the Galactic center.


title:
Single-inclusive hadron production in transversely polarized p-p and
  pbar-p collisions with threshold resummation

abstract:
  We investigate the resummation of large logarithmic perturbative corrections
to the partonic cross sections for single-inclusive high-p_T hadron production
in collisions of transversely polarized hadrons. We perform the resummation to
next-to-leading logarithmic accuracy. Phenomenological results are given for
pbar-p collisions at center-of-mass energy of 14.5 GeV and for p-p collisions
at 62.4 GeV and at 10 GeV, which are relevant for possible experiments at the
GSI-FAIR, RHIC and J-PARC facilities, respectively. We find significant
enhancements of the spin-dependent and spin-averaged cross sections, but a
decrease of the double-spin asymmetry A_TT.


title:
Finite Larmor radius effects on non-diffusive tracer transport in a
  zonal flow

abstract:
  Finite Larmor radius (FLR) effects on non-diffusive transport in a
prototypical zonal flow with drift waves are studied in the context of a
simplified chaotic transport model. The model consists of a superposition of
drift waves of the linearized Hasegawa-Mima equation and a zonal shear flow
perpendicular to the density gradient. High frequency FLR effects are
incorporated by gyroaveraging the ExB velocity. Transport in the direction of
the density gradient is negligible and we therefore focus on transport parallel
to the zonal flows. A prescribed asymmetry produces strongly asymmetric non-
Gaussian PDFs of particle displacements, with L\'evy flights in one direction
but not the other. For zero Larmor radius, a transition is observed in the
scaling of the second moment of particle displacements. However, FLR effects
seem to eliminate this transition. The PDFs of trapping and flight events show
clear evidence of algebraic scaling with decay exponents depending on the value
of the Larmor radii. The shape and spatio-temporal self-similar anomalous
scaling of the PDFs of particle displacements are reproduced accurately with a
neutral, asymmetric effective fractional diffusion model.


title: Role of slip between a probe particle and a gel in microrheology

abstract:
  In the technique of microrheology, macroscopic rheological parameters as well
as information about local structure are deduced from the behavior of
microscopic probe particles under thermal or active forcing. Microrheology
requires knowledge of the relation between macroscopic parameters and the force
felt by a particle in response to displacements. We investigate this response
function for a spherical particle using the two-fluid model, in which the gel
is represented by a polymer network coupled to a surrounding solvent via a drag
force. We obtain an analytic solution for the response function in the limit of
small volume fraction of the polymer network, and neglecting inertial effects.
We use no-slip boundary conditions for the solvent at the surface of the
sphere. The boundary condition for the network at the surface of the sphere is
a kinetic friction law, for which the tangential stress of the network is
proportional to relative velocity of the network and the sphere. This boundary
condition encompasses both no-slip and frictionless boundary conditions as
limits. Far from the sphere there is no relative motion between the solvent and
network due to the coupling between them. However, the different boundary
conditions on the solvent and network tend to produce different far-field
motions. We show that the far field motion and the force on the sphere are
controlled by the solvent boundary conditions at high frequency and by the
network boundary conditions at low frequency. At low frequencies compression of
the network can also affect the force on the sphere. We find the crossover
frequencies at which the effects of sliding of the sphere past the polymer
network and compression of the gel become important.


title:
Counting on Beauty: The role of aesthetic, ethical, and physical
  universal principles for interstellar communication

abstract:
  SETI researchers believe that the basic principles of our science and the
science of extraterrestrial beings should be fundamentally the same, and we
should be able to communicate with them by referring to those things we share,
such as the principles of mathematics, physics, and chemistry (a similar
cognitive map of nature). This view assumes that there is only one way to
conceptualize the laws of nature. Consequently, mathematics and the language of
nature should be universal. In this essay, we discuss the epistemological bases
of the last assumptions. We describe all the hypotheses behind the universality
of the laws of nature and the restrictions that any technology should have to
establish contact with other galactic technological civilization. We introduce
some discussions about the limitations of homocentric views. We discuss about
the possible use of aesthetic cognitive universals as well as ethical ones in
the design of interstellar messages. We discuss the role of symmetry as a
universal cognitive map. We give a specific example on how to use the Golden
Section principles to design a hypothetical interstellar message based in
physical and aesthetical cognitive universals. We build a space of
configuration matrix, representing all the variables to be taken into account
for designing an electromagnetic interstellar message (e.g. frequency,
polarization, bandwidth, transmitting power, modulation, rate of information,
galactic coordinates, etc.) against the limitations imposed by physical,
technological, aesthetical and ethical constraints. We show how to use it, in
order to make hypotheses about the characteristics and properties of
hypothetical extraterrestrial artificial signals and their detection by
existing SETI projects.


title: Variational Theory of Mixtures in Continuum Mechanics

abstract:
  In continuum mechanics, the equations of motion for mixtures are derived
through the use of Hamilton's extended principle which regards the mixture as a
collection of distinct continua. The internal energy is assumed to be a
function of densities, entropies and successive spatial gradients of each
constituent. We first write the equations of motion for each constituent of an
inviscid miscible mixture of fluids without chemical reactions or diffusion.
Our work leads to the equations of motion in an universal thermodynamic form in
which interaction terms subject to constitutive laws, difficult to interpret
physically, do not occur. For an internal energy function of densities,
entropies and spatial gradients, an equation describing the barycentric motion
of the constituents is obtained. The result is extended for dissipative
mixtures and an equation of energy is obtained. A form of Clausius-Duhem's
inequality which represents the second law of thermodynamics is deduced. In the
particular case of compressible mixtures, the equations reproduce the classical
results. Far from critical conditions, the interfaces between different phases
in a mixture of fluids are layers with strong gradients of density and entropy.
The surface tension of such interfaces is interpreted.


title: Black Hole Thermodynamics and Statistical Mechanics

abstract:
  We have known for more than thirty years that black holes behave as
thermodynamic systems, radiating as black bodies with characteristic
temperatures and entropies. This behavior is not only interesting in its own
right; it could also, through a statistical mechanical description, cast light
on some of the deep problems of quantizing gravity. In these lectures, I review
what we currently know about black hole thermodynamics and statistical
mechanics, suggest a rather speculative "universal" characterization of the
underlying states, and describe some key open questions.


title: On the Symmetric Homology of Algebras

abstract:
  Symmetric homology is an analog of cyclic homology in which the cyclic groups
are replaced by symmetric groups. The foundations for the theory of symmetric
homology of algebras are developed in the context of crossed simplicial groups
using derived functors and the symmetric bar construction of Fiedorowicz. The
symmetric homology of group rings is related to stable homotopy theory. Two
chain complexes are constructed that compute symmetric homology, as well as two
spectral sequences. In the setup of the second spectral sequence, a complex
isomorphic to the suspension of the cycle-free chessboard complex of Vrecica
and Zivaljevic appears. Homology operations are defined on the symmetric
homology groups over Z/p, p a prime. Finally, an explicit partial resolution is
presented, permitting the computation of the zeroth and first symmetric
homology groups of finite-dimensional algebras.


title:
Absorption Line Survey of H3+ toward the Galactic Center Sources II.
  Eight Infrared Sources within 30 pc of the Galactic Center

abstract:
  Infrared absorption lines of H3+, including the metastable R(3,3)l line, have
been observed toward eight bright infrared sources associated with hot and
massive stars located in and between the Galactic Center Cluster and the
Quintuplet Cluster 30 pc to the east. The absorption lines with high velocity
dispersion arise in the Galaxy's Central Molecular Zone (CMZ) as well as in
foreground spiral arms. The temperature and density of the gas in the CMZ, as
determined from the relative strengths of the H3+ lines, are T=200-300K and
n=50-200cm^-3. The detection of high column densities of H3+ toward all eight
stars implies that this warm and diffuse gaseous environment is widespread in
the CMZ. The products of the ionization rate and path length for these sight
lines are 1000 and 10 times higher than in dense and diffuse clouds in the
Galactic disk, respectively, indicating that the ionization rate, zeta, is not
less than 10^-15 s^-1 and that L is at least on the order of 50 pc. The warm
and diffuse gas is an important component of the CMZ, in addition to the three
previously known gaseous environments: (1) cold molecular clouds observed by
radio emission of CO and other molecules, (2) hot (T=10^4-10^6K) and highly
ionized diffuse gas (n_e=10-100cm^-3) seen in radio recombination lines, far
infrared atomic lines, and radio-wave scattering, and (3) ultra-hot
(T=10^7-10^8K) X-ray emitting plasma. Its prevalence significantly changes the
understanding of the environment of the CMZ. The sight line toward GC IRS 3 is
unique in showing an additional H3+ absorption component, which is interpreted
as due to either a cloud associated with circumnuclear disk or the "50 km s^-1
cloud" known from radio observations. An infrared pumping scheme is examined as
a mechanism to populate the (3,3) metastable level in this cloud.


title:
From valence bond solid to unconventional superconductivity in the
  organic charge-transfer solids

abstract:
  We show that superconductivity is absent within the 1/2-filled band
triangular lattice repulsive Hubbard model that has been proposed for organic
charge-transfer solids. We posit that organic superconductivity is rather
reached from a Bond-Charge Density Wave that either constitutes the insulating
state proximate to superconductivity, or is extremely close in energy to the
antiferromagnetic state, and replaces the latter under pressure. The
Bond-Charge Density Wave can be described within an effective attractive $U$
extended Hubbard Hamiltonian with repulsive nearest neighbor interaction $V$. A
first-order transition from the insulating to the superconducting state occurs
within the model with increasing frustration.


title: $\nu$-GMSB with Type III Seesaw and Phenomenology

abstract:
  We show that when the supersymmetric SU(5) model is extended to explain small
neutrino masses by the type III seesaw mechanism, the new {\bf 24}-dimensional
fields needed for the purpose can act as messengers for transmitting SUSY
breaking from a hidden sector to the visible sector. For the three {\bf 24}
case, the constraints of grand unification and suppressed lepton flavor
violation restrict the seesaw scale in this case to be in the narrow range of
$10^{12}-10^{13}$ GeV. The model predicts (i) a stable LSP gravitino with mass
in the range of 1-10 MeV which can be a cold dark matter of the universe; (ii)
a stau NLSP which is detectable at LHC; (iii) a lower bound on the branching
ratio $BR(\mu \to e \gamma)$ larger than $10^{-14}$ testable by the ongoing MEG
experiment as well as characteristic particle spectrum different from other
SUSY breaking scenarios. We also discuss the case with two {\bf 24} fields,
which is the minimal case that can explain neutrino oscillation data.


title:
Simulation of spherulite growth using a comprehensive approach to
  modeling the first-order isotropic/smectic-A mesophase transition

abstract:
  A comprehensive modeling and simulation study of the first-order
isotropic/smectic-A transition is presented and applied to phase diagram
computation and two-dimensional spherulite growth. An approach based on
nonlinear optimization, that incorporates experimental data (from 12CB,
dodecyl-cyanobiphenyl), is used to determine physically realistic model
parameters. These parameters are then used in conjunction with an optimized
phase diagram computation method. Additionally, a time-dependent formulation is
presented and applied to the study of two-dimensional smectic-A spherulite
growth. These results show the growth kinematics and defect dynamics of
nanoscale smectic-A spherulite growth in an isotropic phase with an initially
radial layer configuration.


title: Anomalous Conical Di-jet Correlations in pQCD vs AdS/CFT

abstract:
  We propose an identified heavy quark jet observable to discriminate between
weakly coupled pQCD and strongly coupled AdS/CFT models of quark gluon plasma
dynamics in ultra-relativistic nuclear collisions at RHIC and LHC energies.
These models are shown to predict qualitatively different associated hadron
correlations with respect to tagged heavy quark jets. While both models feature
similar far zone Mach and diffusion wakes, the far zone stress features are
shown to be too weak to survive thermal broadening at hadron freeze-out.
However, these models differ significantly in a near zone "Neck" region where
strong chromo-fields sourced by the heavy quark jet couple to the polarizable
plasma. Conical associated correlations, if any, are shown to be dominated by
the jet induced transverse flow in the Neck zone and unrelated to the weak far
zone wakes. Unlike in AdS/CFT, we show that the induced transverse flow in the
Neck zone is too weak in pQCD to produce conical correlations after Cooper-Frye
freeze-out. The observation of conical correlations violating Mach's law would
favor the strongly-coupled AdS/CFT string drag dynamics, while their absence
would favor weakly-coupled pQCD-based chromo-hydrodynamics.


title: T-duality, Generalized Geometry and Non-Geometric Backgrounds

abstract:
  We discuss the action of O(d,d), and in particular T-duality, in the context
of generalized geometry, focusing on the description of so-called non-geometric
backgrounds. We derive local expressions for the pure spinors descibing the
generalized geometry dual to an SU(3) structure background, and show that the
equations for N=1 vacua are invariant under T-duality. We also propose a local
generalized geometrical definition of the charges f, H, Q and R appearing in
effective four-dimensional theories, using the Courant bracket. We then address
certain global aspects, in particular whether the local non-geometric charges
can be gauged away in, for instance, backgrounds admitting a torus action, as
well as the structure of generalized parallelizable backgrounds.


title:
Observing trans-Planckian ripples in the primordial power spectrum with
  future large scale structure probes

abstract:
  We revisit the issue of ripples in the primordial power spectra caused by
trans-Planckian physics, and the potential for their detection by future
cosmological probes. We find that for reasonably large values of the first
slow-roll parameter epsilon (> 0.001), a positive detection of trans-Planckian
ripples can be made even if the amplitude is as low as 10^-4. Data from the
Large Synoptic Survey Telescope (LSST) and the proposed future 21 cm survey
with the Fast Fourier Transform Telescope (FFTT) will be particularly useful in
this regard. If the scale of inflation is close to its present upper bound, a
scale of new physics as high as 0.2 M_Planck could lead to observable
signatures.


title:
Satellite Kinematics I: A New Method to Constrain the Halo
  Mass-Luminosity Relation of Central Galaxies

abstract:
  Satellite kinematics can be used to probe the masses of dark matter haloes of
central galaxies. In order to measure the kinematics with sufficient
signal-to-noise, one uses the satellite galaxies of a large number of central
galaxies stacked according to similar properties (e.g., luminosity). However,
in general the relation between the luminosity of a central galaxy and the mass
of its host halo will have non-zero scatter. Consequently, this stacking
results in combining the kinematics of satellite galaxies in haloes of
different masses, which complicates the interpretation of the data. In this
paper we present an analytical framework to model satellite kinematics,
properly accounting for this scatter and for various selection effects. We show
that in the presence of scatter in the halo mass-luminosity relation, the
commonly used velocity dispersion of satellite galaxies can not be used to
infer a unique halo mass-luminosity relation. In particular, we demonstrate
that there is a degeneracy between the mean and the scatter of the halo
mass-luminosity relation. We present a new technique that can break this
degeneracy, and which involves measuring the velocity dispersions using two
different weighting schemes: host-weighting (each central galaxy gets the same
weight) and satellite-weighting (each central galaxy gets a weight proportional
to its number of satellites). The ratio between the velocity dispersions
obtained using these two weighting schemes is a strong function of the scatter
in the halo mass-luminosity relation, and can thus be used to infer a unique
relation between light and mass from the kinematics of satellite galaxies.


title:
Imprint of Inhomogeneous Hydrogen Reionization on the Temperature
  Distribution of the Intergalactic Medium

abstract:
  We study the impact of inhomogeneous hydrogen reionization on the thermal
evolution of the intergalactic medium (IGM) using hydrodynamic + radiative
transfer simulations where reionization is completed either early (z ~ 9) or
late (z ~ 6). In general, we find that low-density gas near large-scale
overdensities is ionized and heated earlier than gas in the large-scale,
underdense voids. Furthermore, at a later time the IGM temperature is inversely
related to the reionization redshift because gas that is heated earlier has
more time to cool through adiabatic expansion and Compton scattering. Thus, at
the end of reionization the median temperature-density relation is an inverted
power-law with slope gamma-1 ~ -0.2, in both models. However, at fixed density,
there is up to order unity scatter in the temperature due to the distribution
of reionization redshifts. Because of the complex equation-of-state, the
evolved IGM temperature-density relations for the redshift range 4 < z < 6 can
still have significant curvature and scatter. These features must be taken into
account when interpreting the Lyman alpha absorption in high redshift quasar
spectra.


title:
Valence bond glass -- A unified theory of electronic disorder and
  pseudogap phenomena in high temperature superconductors

abstract:
  We show that the low-energy fluctuations of the valence bond in underdoped
high-T_c cuprates, originating from quantum fluctuations of the superexchange
interaction, are pinned by the electronic disorder due to off-stoichiometric
dopants, leading to a valence bond glass (VBG) pseudogap phase. The antinodal
Fermi surface sections are gapped out, giving rise to a normal state Fermi arc
whose length shrinks with underdoping. Below T_c, the superexchange interaction
induces a d-wave superconducting gap that coexists with the VBG pseudogap. The
evolution of the local and momentum-space spectroscopy with doping and
temperature captures the salient properties of the pseudogap phenomena and the
electronic disorder. The unified theory elucidates the important interplay
between strong correlation and the intrinsic electronic disorder in doped
transition metal oxides.


title:
Satellite Kinematics II: The Halo Mass-Luminosity Relation of Central
  Galaxies in SDSS

abstract:
  The kinematics of satellite galaxies reflect the masses of the extended dark
matter haloes in which they orbit, and thus shed light on the mass-luminosity
relation (MLR) of their corresponding central galaxies. In this paper we select
a large sample of centrals and satellites from the Sloan Digital Sky Survey
(SDSS) and measure the kinematics (velocity dispersions) of the satellite
galaxies as a function of the $r$-band luminosity of the central galaxies.
Using the analytical framework presented in Paper I, we use these data to infer
{\it both} the mean and the scatter of the MLR of central galaxies, carefully
taking account of selection effects and biases introduced by the stacking
procedure. As expected, brighter centrals on average reside in more massive
haloes. In addition, we find that the scatter in halo masses for centrals of a
given luminosity, $\sigma_{\log M}$, also increases with increasing luminosity.
As we demonstrate, this is consistent with $\sigma_{\log L}$, which reflects
the scatter in the conditional probability function $P(L_c|M)$, being
independent of halo mass. Our analysis of the satellite kinematics yields
$\sigma_{\log L}=0.16\pm0.04$, in excellent agreement with constraints from
clustering and group catalogues, and with predictions from a semi-analytical
model of galaxy formation. We thus conclude that the amount of stochasticity in
galaxy formation, which is characterized by $\sigma_{\log L}$, is well
constrained, is independent of halo mass, and is in good agreement with current
models of galaxy formation.


title: Modelling rapid TeV variability of PKS 2155-304

abstract:
  We present theoretical modelling for the very rapid TeV variability of PKS
2155--304 observed recently by the H.E.S.S. experiment. To explain the
light-curve, where at least five flaring events were well observed, we assume
five independent components of a jet that are characterized by slightly
different physical parameters. An additional, significantly larger component is
used to explain the emission of the source at long time scales. This component
dominates the emission in the X-ray range, whereas the other components are
dominant in the TeV range. The model used for our simulation describes
precisely the evolution of the particle energy spectrum inside each component
and takes into account light travel time effects. We show that a relatively
simple synchrotron self-Compton scenario may explain this very rapid
variability. Moreover, we find that absorption of the TeV emission inside the
components due to the pair creation process is negligible.


title: Unconventional quantum phases of lattice bosonic mixtures

abstract:
  We consider strongly interacting boson-boson mixtures on one-dimensional
lattices and, by adopting a qualitative mean-field approach, investigate their
quantum phases as the interspecies repulsion is increased. In particular, we
analyze the low-energy "quantum emulsion" metastable states occurring at large
values of the interspecies interaction, which are expected to prevent the
system from reaching its true ground state. We argue a significant decrease in
the visibility of the time-of-flight images in the case of these spontaneously
disordered states.

categories: cond-mat.other hep-lat physics.atom-ph quant-ph


title: Decoherence of floating qubits due to capacitive coupling

abstract:
  It has often been assumed that electrically floating qubits, such as flux
qubits, are immune to decoherence due to capacitive coupling. We show that
capacitive coupling to bias leads can be a dominant source of dissipation, and
therefore of decoherence, for such floating qubits. Classical electrostatic
arguments are sufficient to get a good estimate of this source of relaxation
for standard superconducting qubit designs. We show that relaxation times can
be improved by designing floating qubits so they couple symmetrically to the
bias leads. Observed coherence times of flux qubits with varying degrees of
symmetry qualitatively support our results.


title: Private information via the Unruh effect

abstract:
  In a relativistic theory of quantum information, the possible presence of
horizons is a complicating feature placing restrictions on the transmission and
retrieval of information. We consider two inertial participants communicating
via a noiseless qubit channel in the presence of a uniformly accelerated
eavesdropper. Owing to the Unruh effect, the eavesdropper's view of any encoded
information is noisy, a feature the two inertial participants can exploit to
achieve perfectly secure quantum communication. We show that the associated
private quantum capacity is equal to the entanglement-assisted quantum capacity
for the channel to the eavesdropper's environment, which we evaluate for all
accelerations.


title: Empirical transverse charge densities in the deuteron

abstract:
  Using the recent empirical information on the deuteron electromagnetic form
factors we map out the transverse charge density in the deuteron as viewed from
a light front moving towards the deuteron. The charge densities for a
transversely polarized deuteron are characterized by monopole, dipole and
quadrupole patterns.


title: Elastic Theory of Defects in Toroidal Crystals

abstract:
  We report a comprehensive analysis of the ground state properties of
axisymmetric toroidal crystals based on the elastic theory of defects on curved
substrates. The ground state is analyzed as a function of the aspect ratio of
the torus, which provides a non-local measure of the underlying Gaussian
curvature, and the ratio of the defect core-energy to the Young modulus.
Several structural features are discussed,including a spectacular example of
curvature-driven amorphization in the limit of the aspect ratio approaching
one. The outcome of the elastic theory is then compared with the results of a
numerical study of a system of point-like particles constrained on the surface
of a torus and interacting via a short range potential.


title: Resultants and Contour Integrals

abstract:
  Resultants are important special functions used in description of non-linear
phenomena. Resultant $R_{r_1, ..., r_n}$ defines a condition of solvability for
a system of $n$ homogeneous polynomials of degrees $r_1, ..., r_n$ in $n$
variables, just in the same way as determinant does for a system of linear
equations. Unfortunately, there is a lack of convenient formulas for resultants
when the number of variables is large. In this paper we use Cauchy contour
integrals to obtain a polynomial formula for resultants, which is expected to
be useful in applications.


title: Generalized non-supersymmetric flux vacua

abstract:
  We discuss a novel strategy to construct 4D N=0 stable flux vacua of type II
string theory, based on the existence of BPS bounds for probe D-branes in some
of these backgrounds. In particular, we consider compactifications where
D-branes filling the 4D space-time obey the same BPS bound as they would in an
N=1 compactification, while other D-branes, like those appearing as domain
walls from the 4D perspective, can no longer be BPS. We construct a subfamily
of such backgrounds giving rise to 4D N=0 Minkowski no-scale vacua,
generalizing the well-known case of type IIB on a warped Calabi-Yau. We provide
several explicit examples of these constructions, and compute quantities of
phenomenological interest like flux-induced soft terms on D-branes. Our results
have a natural, simple description in the language of Generalized Complex
Geometry, and in particular in terms of D-brane generalized calibrations.
Finally, we extend the integrability theorems for 10D supersymmetric type II
backgrounds to the N=0 case and use the results to construct a new class of N=0
AdS4 compactifications.


title: Radiative Hydrodynamical Studies of Irradiated Atmospheres

abstract:
  Transiting planets provide a unique opportunity to study the atmospheres of
extra-solar planets. Radiative hydrodynamical models of the atmosphere provide
a crucial link between the physical characteristics of the atmosphere and the
observed properties. Here I present results from 3D simulations which solve the
full Navier-Stokes equations coupled to a flux-limited diffusion treatment of
radiation transfer for planets with 1, 3, and 7 day periods. Variations in
opacity amongst models leads to a variation in the temperature differential
across the planet, while atmospheric dynamics becomes much more variable at
longer orbital periods. I also present 3D radiative simulations illustrating
the importance of distinguishing between optical and infrared opacities.


title: Supersymmetry, holonomy and Kundt spacetimes

abstract:
  Supersymmetric solutions of supergravity theories, and consequently metrics
with special holonomy, have played an important role in the development of
string theory. We describe how a Lorentzian manifold is either completely
reducible, and thus essentially known, or not completely reducible so that
there exists a degenerate holonomy invariant lightlike subspace and
consequently admits a covariantly constant or a recurrent null vector and
belongs to the higher-dimensional Kundt class of spacetimes. These Kundt
spacetimes (which contain the vanishing and constant curvature invariant
spacetimes as special cases) are genuinely Lorentzian and have a number of
interesting and unusual properties, which may lead to novel and fundamental
physics.


title: Direct Mediation and a Visible Metastable Supersymmetry Breaking Sector

abstract:
  We analyze an R-symmetry breaking deformation of the ISS model for a direct
mediation of supersymmetry breaking from a metastable vacuum. The model is
weakly coupled and calculable. The LSP gravitino is light (m_{3/2}<16 eV) and
the MSSM spectrum is natural with a light Higgs. The supersymmetry breaking
sector, which is usually hidden, is observable (m~1 TeV) and may be a candidate
for cold dark matter. We discuss its production and signature at LHC. We
propose a UV completion of the model in terms of a duality cascade.


title:
Measurement of D0-D0bar mixing from a time-dependent amplitude analysis
  of D0 -> K+ pi- pi0 decays

abstract:
  We present evidence of $D^0$-$\bar{D^0}$ mixing using a time-dependent
amplitude analysis of the decay D0->K+pi-pi0 in a data sample of 384 fb^-1
collected with the BaBar detector at the PEP-II e+e- collider at SLAC. Assuming
CP conservation, we measure the mixing parameters x'_{Kpipi0} =
[2.61^{+0.57}_{-0.68} (stat.) +- 0.39 (syst.)]%, y'_{Kpipi0} = [-0.06
^{+0.55}_{-0.64} (stat.) +- 0.34 (syst.)]%. The confidence level for the data
to be consistent with the no-mixing hypothesis is 0.1%, including systematic
uncertainties. This result is inconsistent with the no-mixing hypothesis with a
significance of 3.2 standard deviations. We find no evidence of CP violation in
mixing.


title:
Search for CP Violation in the Dalitz-Plot Analysis of D+/- -> K+ K-
  pi+/-

abstract:
  We report on a search for CP asymmetry in the singly Cabibbo-suppressed decay
D+ -> K+ K- pi+ using a data sample of 818 pb-1 accumulated with the CLEO-c
detector on the psi(3770) resonance. A Dalitz-plot analysis is used to
determine the amplitudes of the intermediate states. We find no evidence for CP
violation either in specific two-body amplitudes or integrated over the entire
phase space. The CP asymmetry in the latter case is measured to be
(-0.03+-0.84+-0.29)%.


title: Static and dynamic properties of vortices in anisotropic magnetic disks

abstract:
  We investigate the effect of the magnetic anisotropy ($K_z$) on the static
and dynamic properties of magnetic vortices in small disks. Our micromagnetic
calculations reveal that for a range of $K_z$ there is an enlargement of the
vortex core. We analyze the influence of $K_z$ on the dynamics of the vortex
core magnetization reversal under the excitation of a pulsed field. The
presence of $K_z$, which leads to better resolved vortex structures, allows us
to discuss in more details the role played by the in-plane and perpendicular
components of the gyrotropic field during the vortex-antivortex nucleation and
annihilation.


title:
On the Existence of Quantum Wave Function and Quantum Interference
  Effects in Mental States: An Experimental Confirmation during Perception and
  Cognition in Humans

abstract:
  We introduce the quantum theoretical formulation to determine a posteriori,
if existing, the quantum wave functions and to estimate the quantum
interference effects of mental states. Such quantum features are actually found
in the case of an experiment involving the perception and the cognition in
humans. Also some specific psychological variables are introduced and it is
obtained that they characterize in a stringent manner the quantum behaviour of
mind during such performed experiment.


title: Compound Multiple Access Channels with Partial Cooperation

abstract:
  A two-user discrete memoryless compound multiple access channel with a common
message and conferencing decoders is considered. The capacity region is
characterized in the special cases of physically degraded channels and
unidirectional cooperation, and achievable rate regions are provided for the
general case. The results are then extended to the corresponding Gaussian
model. In the Gaussian setup, the provided achievable rates are shown to lie
within some constant number of bits from the boundary of the capacity region in
several special cases. An alternative model, in which the encoders are
connected by conferencing links rather than having a common message, is studied
as well, and the capacity region for this model is also determined for the
cases of physically degraded channels and unidirectional cooperation. Numerical
results are also provided to obtain insights about the potential gains of
conferencing at the decoders and encoders.


title: The Structure of Active Merger Remnant NGC 6240 from IRAC Observations

abstract:
  NGC 6240 is a rare object in the local universe: an active merger remnant
viewed at the point of merging where two active galactic nuclei are visible. We
present IRAC data of this object, providing high sensitivity maps of the
stellar and PAH distribution in this complicated system. We use photometry to
analyze the variation in these distributions with radius and provide an SED in
the four IRAC bands: 3.6 microns, 4.5 microns, 5.8 microns and 8.0 microns. We
fit the radial profiles of the 3.6 micron band to r^.25 and exponential
profiles to evaluate the structure of the remnant. Finally, we compare the IRAC
images with multi-wavelength data and examine how outflows in the X-ray, Halpha
and CO correlate with 8 micron emission. The results support the general
picture of NGC 6240 as a system experiencing a major merger and transitioning
from a disk galaxy to a spheroid. The sensitivity of IRAC to low surface
brightness mid-infrared features provides detailed information on the extended
distributions of stars and dust in this rare system.


title: Factorization in generalized Calogero-Moser spaces

abstract:
  Using a recent construction of Bezrukavnikov and Etingof we prove that there
is a factorization of the Etingof-Ginzburg sheaf on the generalized
Calogero-Moser space associated to a complex reflection group. In the case W =
S_n, this confirms a conjecture of Etingof and Ginzburg.


title:
Deriving Boltzmann Equations from Kadanoff-Baym Equations in Curved
  Space-Time

abstract:
  To calculate the baryon asymmetry in the baryogenesis via leptogenesis
scenario one usually uses Boltzmann equations with transition amplitudes
computed in vacuum. However, the hot and dense medium and, potentially, the
expansion of the universe can affect the collision terms and hence the
generated asymmetry. In this paper we derive the Boltzmann equation in the
curved space-time from (first-principle) Kadanoff-Baym equations. As one
expects from general considerations, the derived equations are covariant
generalizations of the corresponding equations in Minkowski space-time. We find
that, after the necessary approximations have been performed, only the
left-hand side of the Boltzmann equation depends on the space-time metric. The
amplitudes in the collision term on the right--hand side are independent of the
metric, which justifies earlier calculations where this has been assumed
implicitly. At tree level, the matrix elements coincide with those computed in
vacuum. However, the loop contributions involve additional integrals over the
the distribution function.


title: Non-optimality of unitary operations for dense coding

abstract:
  One of the primary goals of information theory is to provide limits on the
amount of information it is possible to send through various types of
communication channels, and to understand the encoding methods that will allow
one to achieve such limits. An early surprise in the study of \textit{quantum}
information theory was the discovery of dense coding, which demonstrated that
it is possible to achieve higher rates for communicating classical information
by transmitting quantum systems, rather than classical ones. To achieve the
highest possible rate, the transmitted quantum system must initially be
maximally entangled with another that is held by the receiver, and the sender
can achieve this rate by encoding her messages with unitary operations. The
situation where these two systems are not maximally entangled has been
intensively studied in recent years, and to date it has appeared as though
unitary encoding might well be optimal in all cases. Indeed, this optimality of
unitary operations for quantum communication protocols has been found to hold
under far more general conditions, extending well beyond the special case of
dense coding. Nonetheless, we here present strong numerical evidence supported
by analytical arguments that indicate there exist circumstances under which one
can encode strictly more classical information using dense coding with
non-unitary, as opposed to unitary, operations.


title: A Bialgebraic Approach to Automata and Formal Language Theory

abstract:
  A bialgebra is a structure which is simultaneously an algebra and a
coalgebra, such that the algebraic and coalgebraic parts are "compatible".
Bialgebras are normally studied over a field or commutative ring. In this
paper, we show how to apply the defining diagrams of algebras, coalgebras, and
bialgebras to categories of semimodules and semimodule homomorphisms over a
commutative semiring. We then show that formal language theory and the theory
of bialgebras have essentially undergone "convergent evolution", with the same
constructions appearing in both contexts. For example, formal languages
correspond to elements of dual algebras of coalgebras, automata are "pointed
representation objects" of algebras, automaton morphisms are instances of
linear intertwiners, and a construction from the theory of bialgebras shows how
to run two automata in parallel. We also show how to associate an automaton
with an arbitrary algebra, which in the classical case yields the automaton
whose states are formal languages and whose transitions are given by language
differentiation.


title:
Gravitational waves from fragmentation of a primordial scalar condensate
  into Q-balls

abstract:
  A generic consequence of supersymmetry is formation of a scalar condensate
along the flat directions of the potential at the end of cosmological
inflation. This condensate is usually unstable, and it can fragment into
non-topological solitons, Q-balls. The gravitational waves produced by the
fragmentation can be detected by Laser Interferometer Space Antenna (LISA),
Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO), and Big
Bang Observer (BBO), which can offer an important window on the early universe
and the physics at some very high energy scales.


title: Density-functional theory of nonequilibrium tunneling

abstract:
  Nanoscale optoelectronics and molecular-electronics systems operate with
current injection and nonequilibrium tunneling, phenomena that challenge
consistent descriptions of the steady-state transport. The current affects the
electron-density variation and hence the inter- and intra-molecular bonding
which in turn determines the transport magnitude. The standard approach for
efficient characterization of steady-state tunneling combines ground-state
density functional theory (DFT) calculations (of an effective scattering
potential) with a Landauer-type formalism and ignores all actual many-body
scattering. The standard method also lacks a formal variational basis. This
paper formulates a Lippmann-Schwinger collision density functional theory
(LSC-DFT) for tunneling transport with full electron-electron interactions.
Quantum-kinetic (Dyson) equations are used for an exact reformulation that
expresses the variational noninteracting and interacting many-body scattering
T-matrices in terms of universal density functionals. The many-body
Lippmann-Schwinger (LS) variational principle defines an implicit equation for
the exact nonequilibrium density.


title: Quantizing N=2 Multicenter Solutions

abstract:
  N=2 supergravity in four dimensions, or equivalently N=1 supergravity in five
dimensions, has an interesting set of BPS solutions that each correspond to a
number of charged centers. This set contains black holes, black rings and their
bound states, as well as many smooth solutions. Moduli spaces of such solutions
carry a natural symplectic form which we determine, and which allows us to
study their quantization. By counting the resulting wavefunctions we come to an
independent derivation of some of the wall-crossing formulae. Knowledge of the
explicit form of these wavefunctions allows us to find quantum resolutions to
some apparent classical paradoxes such as solutions with barely bound centers
and those with an infinitely deep throat. We show that quantum effects seem to
cap off the throat at a finite depth and we give an estimate for the
corresponding mass gap in the dual CFT. This is an interesting example of a
system where quantum effects cannot be neglected at macroscopic scales even
though the curvature is everywhere small.


title: The Peculiar Periodic YSO WL 4 in Rho Ophiuchus

abstract:
  We present the discovery of 130.87 day periodic near-infrared flux
variability for the Class II T Tauri star WL 4 (= 2MASS J16271848-2429059,
ISO-Oph 128). Our data are from the 2MASS Calibration Point Source Working
Database, and constitute 1580 observations in J, H and Ks of a field in Rho
Ophiuchus used to calibrate the 2MASS All-Sky Survey. We identify a light curve
for WL 4 with eclipse amplitudes of ~0.4 mag lasting more than one-quarter the
period, and color variations in J-H and H-Ks of ~0.1 mag. The long period
cannot be explained by stellar rotation. We propose that WL 4 is a triple YSO
system, with an inner binary orbital period of 130.87 days. We posulate that we
are observing each component of the inner binary alternately being eclipsed by
a circum-binary disk with respect to our line of sight. This system will be
useful in investigating terrestrial zone YSO disk properties and dynamics at ~1
Myr.


title:
Chemical abundances in giants stars of the tidally disrupted globular
  cluster NGC 6712 from high-resolution infrared spectroscopy

abstract:
  We present abundances of C, N, O, F, Na, and Fe in six giant stars of the
tidally disrupted globular cluster NGC 6712. The abundances were derived by
comparing synthetic spectra with high resolution infrared spectra obtained with
the Phoenix spectrograph on the Gemini South telescope. We find large
star-to-star abundance variations of the elements C, N, O, F, and Na. NGC 6712
and M4 are the only globular clusters in which F has been measured in more than
two stars, and both clusters reveal F abundance variations whose amplitude is
comparable to, or exceeds, that of O, a pattern which may be produced in M >
5M_sun AGB stars. Within the limited samples, the F abundance in globular
clusters is lower than in field and bulge stars at the same metallicity. NGC
6712 and Pal 5 are tidally disrupted globular clusters whose red giant members
exhibit O and Na abundance variations not seen in comparable metallicity field
stars. Therefore, globular clusters like NGC 6712 and Pal 5 cannot contribute
many field stars and/or field stars do not form in environments with chemical
enrichment histories like that of NGC 6712 and Pal 5. Although our sample size
is small, from the amplitude of the O and Na abundance variations, we infer a
large initial cluster mass and tentatively confirm that NGC 6712 was once one
of the most massive globular clusters in our Galaxy.


title: Designer de Sitter Spacetimes

abstract:
  Recent observations in cosmology indicate an accelerating expansion of the
universe postulated to arise from some form of dark energy, the paradigm being
positive cosmological constant. De Sitter spacetime is the well-known isotropic
solution to the Einstein equations with cosmological constant. However, as
discussed here, it is not the most general, locally isotropic solution. One can
construct an infinite family of such solutions, designer de Sitter spacetimes,
which are everywhere locally isometric to a region of de Sitter spacetime.
However, the global dynamics of these designer cosmologies is very different
than that of de Sitter spacetime itself. The construction and dynamics of these
designer de Sitter spacetimes is detailed along with some comments about their
implications for the structure of our universe.


title: Bulk Negative Index Photonic Metamaterials for Direct Laser Writing

abstract:
  We show the designs of one- and two-dimensional photonic negative index
metamaterials around telecom wavelengths. Designed bulk structures are
inherently connected, which render their fabrication feasible by direct laser
writing and chemical vapor deposition.


title: AdS4/CFT3 at One Loop

abstract:
  I consider semi-classical type IIA strings rotating in the AdS4 part of AdS4
X CP3. The one loop sigma model corrections to this classical solution are used
to compute the energy shift, and the result is found to be E-S=f(lambda) ln S
with f(lambda)= sqrt{2 lambda} - 5 ln 2 /2 pi + O (1/sqrt{lambda}). Even though
the functional forms match, the actual numerical value of this one loop string
result differs from the result obtained on the integrable N=6 Chern-Simons
(ABJM) theory side.


title: Functorial reconstruction theorems for stacks

abstract:
  We study the circumstances under which one can reconstruct a stack from its
associated functor of isomorphism classes. This is possible surprisingly often:
we show that many of the standard examples of moduli stacks are determined by
their functors. Our methods seem to exhibit new anabelian-type phenomena, in
the form of structures in the category of schemes that encode automorphism data
in groupoids.


title: Three-body Interactions in one Dimension

abstract:
  We determine the phase-diagram of a one-dimensional system of hard-core
lattice bosons interacting via repulsive three-body interactions by analytic
methods and extensive quantum Monte-Carlo simulations. Such three-body
interactions can be derived from a microscopic theory for polar molecules
trapped in an optical lattice. Depending on the strength of the interactions
and the particle density, we find superfluid and solid phases, the latter
appearing at an unconventional filling of the lattice and displaying a
coexistence of charge-density-wave and bond orders.


title:
Metallic Pattern Fabrication in Organic Mott Insulating Crystal by Local
  X-Ray Irradiation

abstract:
  We have fabricated a metallic structure in an organic Mott insulator
$\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Cl. The periodic metallic domains of
approximately 90$\times$90 $\mu$m$^2$ obtained by X-ray irradiation through a
molybdenum mesh mask are visualized by scanning microregion infrared
reflectance spectroscopy technique. No deterioration by irradiation is found in
a range of nanometer to micrometer scales. We demonstrate that the present
processing method is applicable for the fabrication of molecular electronic
devices.


title: The Pion Form Factor in AdS/QCD

abstract:
  Holographic QCD provides a unique framework in which to compute QCD
observables. In this talk we summarize recent numerical work on computing the
pion electromagnetic form factor using an AdS/QCD action that includes both
spontaneous and explicit chiral symmetry breaking. We consider both hard- and
soft-wall model results and develop an intermediate background that supports
the best features of both. We also begin to see possible evidence in the fit
for the presence of 1/N_c corrections.


title: Anisotropic pairing in the iron pnictides

abstract:
  We determine the anisotropy of the spin fluctuation induced pairing gap on
the Fermi surface of the FeAs based superconductors as function of the exchange
and Hund's coupling $J_{H}$. We find that for sufficiently large $J_{H}$,
nearly commensurate magnetic fluctuations yield a fully gapped
$s^{\pm}$-pairing state with small anisotropy of the gap amplitude on each
Fermi surface sheet, but significant variations of the gap amplitude for
different sheets of the Fermi surface. In particular, we obtain the large
variation of the gap amplitude on different Fermi surface sheets, as seen in
ARPES experiments. For smaller values of Hund's coupling incommensurate
magnetic fluctuations yield an $s^{\pm}$-pairing state with line nodes. Such a
state is also possible once the anisotropy of the material is reduced and three
dimensional effects come into play.


title: Amplitude Analysis of the Decay B0 -> K+pi-pi0

abstract:
  We report an updated amplitude analysis of the charmless hadronic decays of
neutral B mesons to K+pi-pi0. With a sample of 454 million Upsilon(4S) ->
B0B0bar decays collected by the BABAR detector at the PEP-II asymmetric-energy
B Factory at SLAC, we measure the magnitudes and phases of the intermediate
resonant and nonresonant amplitudes for B0 and B0bar decays and determine the
corresponding CP-averaged fit fractions and charge asymmetries.


title:
Asymptotic teleportation scheme as a universal programmable quantum
  processor

abstract:
  We consider a scheme of quantum teleportation where a receiver has multiple
(N) output ports and obtains the teleported state by merely selecting one of
the N ports according to the outcome of the sender's measurement. We
demonstrate that such teleportation is possible by showing an explicit protocol
where N pairs of maximally entangled qubits are employed. The optimal
measurement performed by a sender is the square-root measurement, and a perfect
teleportation fidelity is asymptotically achieved for a large N limit. Such
asymptotic teleportation can be utilized as a universal programmable processor.


title:
Effects of Zn substitution in La2-xSrxCu1-yZnyO4: interplay among
  superconductivity, pseudogap, and stripe order

abstract:
  The effect of Zn substitution on the superconducting transition temperature,
Tc, was investigated for the La2-xSrxCu1-yZnyO4 (Zn-LSCO) compounds over a wide
range of hole concentration, p (= x), and Zn content (y) in the CuO2 plane. Zn
induced rate of suppression of Tc, dTc/dy, was found to be strongly p-dependent
and showed a systematic variation with hole concentration, except in the
vicinity of p ~ 0.12, i.e., near the so-called 1/8th anomaly where the
charge/spin stripe correlations are at its strongest in La2-xSrxCuO4. Near p ~
0.12, the static striped charge ordering is widely believed to dominate the T-p
phase diagram. dTc/dy decreased strongly around this hole concentration i.e.,
Zn became less effective in degrading Tc near p ~ 0.12. This observation is
indicative of an intricate and competing interplay among the superconducting,
pseudogap, and stripe correlations in Zn-LSCO.


title: A Search for Exotrojans in Transiting Exoplanetary systems

abstract:
  We present a search for Trojan companions to 25 transiting exoplanets. We use
the technique of Ford & Gaudi 2006, in which a difference is sought between the
observed transit time and the transit time that is calculated by fitting a
two-body Keplerian orbit to the radial-velocity data. This technique is
sensitive to the imbalance of mass at the L4/L5 points of the planet-star
orbit. No companions were detected. The median 2$\sigma$ upper limit is 60
Earth masses, and the most constraining limit is 2.5 Earth masses for the case
of GJ 436.


title:
Recent OH Zeeman Observations: Do they Really Contradict the
  Ambipolar-Diffusion Theory of Star Formation?

abstract:
  Until recently, many of the dozens of quantitative predictions of the
ambipolar-diffusion theory of gravitational fragmentation (or core formation)
of molecular clouds have been confirmed by observations and, just as
importantly, no prediction has been contradicted by any observation. A recent
paper, however, claims that measurements of the variation of the mass-to-flux
ratio from envelopes to cores in four clouds {\it de}creases, in direct
contrast to a prediction of the theory but in agreement with turbulent
fragmentation (in the absence of gravity) and, therefore, the
ambipolar-diffusion theory is invalid (Crutcher et al 2008). The paper treats
magnetic-field nondetections as if they were detections. We show that the
analysis of the data is fundamentally flawed and, moreover, the comparison with
the theoretical prediction ignores major geometrical effects, suggested by the
data themselves if taken at face value. The magnetic fluxes of the envelopes
are also miscalculated. We carry out a proper error analysis and treatment of
the nondetections and we show that the claimed measurement of the variation of
the mass-to-flux ratio from envelopes to cores is not valid, no contradiction
with the ambipolar-diffusion theory can be concluded, and no theory can be
tested on the basis of these data.


title:
Experimental Consequences of the S-wave $\cos(k_x) \cdot \cos(k_y)$
  Superconductivity in the Iron-Pnictides

abstract:
  The experimental consequences of different order parameters in iron-based
superconductors are theoretically analyzed. We consider both nodeless and nodal
order parameters, with an emphasis on the $\cos(k_x)\cdot \cos(k_y)$ nodeless
order parameter recently derived by two of us. We analyze the effect of this
order parameter on the spectral function, density of states, tunneling
differential conductance, penetration depth, and the NMR spin relaxation time.
This extended s-wave symmetry has line-zeroes in between the electron and hole
pockets, but they do not intersect the two Fermi surfaces for moderate doping,
and the superconductor is fully gapped. However, this suggests several
quantitative tests: the exponential decay of the penetration depth weakens and
the density of states reveals a smaller gap upon electron or hole doping.
Moreover, the $\cos(k_x) \cdot \cos(k_y)$ superconducting gap is largest on the
smallest (hole) Fermi surface. For the $1/T_1$ NMR spin relaxation rate, the
inter-band contribution is consistent with the current experimental results,
including a (non-universal) $T^{3}$ behavior and the absence of a coherence
peak. However, the intra-band contribution is considerably larger than the
inter-band contributions and still exhibits a small enhancement in the NMR spin
relaxation rate right below $T_c$ in the clean limit.


title: Discovery of a young massive stellar cluster near HESS J1813-178

abstract:
  We present the serendipitous discovery of a young stellar cluster in the
Galactic disk at l=12deg. Using Keck/NIRSPEC, we obtained high- and
low-resolution spectroscopy of several stars in the cluster, and we identified
one red supergiant and two blue supergiants. The radial velocity of the red
supergiant provides a kinematic cluster distance of 4.7pm0.4 kpc, implying
luminosities of the stars consistent with their spectral types. Together with
the known Wolf-Rayet star located 2.4' from the cluster center, the presence of
the red supergiant and the blue supergiants suggests a cluster age of 6-8 Myr,
and an initial mass of 2000 Msun. Several stars in the cluster are coincident
with X-ray sources, including the blue supergiants and the Wolf-Rayet star.
This is indicative of a high binary fraction, and is reminiscent of the massive
young cluster Westerlund 1. The cluster is coincident with two supernova
remnants, SNR G12.72-0.0 and G12.82-0.02, and the highly magnetized pulsar
associated with the TeV gamma-ray source HESS J1813-178. The mixture of
spectral types suggests that the progenitors of these objects had initial
masses of 20 - 30 Msun.


title: Proof of the entropy bound on dynamical horizons

abstract:
  The entropy bound conjecture concerning black hole dynamical horizons is
proved. The conjecture states, if a dynamical horizon, $D_H$, is bounded by two
surfaces with areas of $A_B$ and $\abp$ ($\abp>A_B$), then the entropy, $S_D$,
that crosses $D_H$ must satisfy $S_D\leq {1/4}(\abp-A_B)$. We show that this
conjecture is implied by the generalized Bousso bound. Consequently, the
generalized second law holds for dynamical horizons. Finally, we show that the
lightlike bousso bound and its spacelike counterpart can be unified as one
bound.


title: Control of heat transport in quantum spin systems

abstract:
  We study heat transport in quantum spin systems analytically and numerically.
First, we demonstrate that heat current through a two-level quantum spin system
can be modulated from zero to a finite value by tuning a magnetic field.
Second, we show that a spin system, consisting of two dissimilar parts - one is
gapped and the other is gapless, exhibits current rectification and negative
differential thermal resistance. Possible experimental realizations by using
molecular junctions or magnetic materials are discussed.


title:
Designing the unambiguous discriminator from the one -photon
  interferometer

abstract:
  In this paper, we shall show that the question of quanum state unambiguous
discrimination can be solved by reducing it to the known problem of quantum
states filtering.


title:
Intrinsic and extrinsic origins of the polar Kerr effect in a chiral
  p-wave superconductor

abstract:
  Recently, the measurement of the polar Kerr effect (PKE) in the quasi
two-dimensional superconductor Sr2RuO4, which is motivated to observe the
chirality of px + i py-wave pairing, has been reported. We clarify that the PKE
has intrinsic and extrinsic (disorder-induced) origins. The extrinsic
contribution would be dominant in the PKE experiment.


title:
Domain walls and gauge field localization in strongly-coupled pure
  Yang-Mills theories

abstract:
  We present a mechanism of gauge field localization on a domain wall within
the framework of strongly coupled pure Yang-Mills theory.


title:
Radio observations of the Horologium-Reticulum Supercluster -I. A3158:
  Excess star-forming galaxies in a merging cluster?

abstract:
  We present 1.4 and 2.5 GHz Australia Telescope Compact Array (ATCA)
observations of the galaxy cluster A3158 (z=0.0597) which is located within the
central part of the Horologium-Reticulum Supercluster (HRS). Spectroscopic data
for the central part of the HRS suggest that A3158 is in a dynamically
important position within the supercluster and that it is moving toward the
double cluster system A3125/A3128 which marks the centre of the HRS. A total of
110 radio galaxies are detected in a 35 arcminute radius about the cluster at
1.4 GHz, of which 30 are also detected at 2.5 GHz.We examine the source counts
and compute the Radio Luminosity Function (RLF) at 1.4 GHz from the subset of
88 sources found within the fullwidth half-power area of the ATCA beam.
Comparison of the source counts in the area over the background, as computed by
Prandoni et al. (2001), shows some evidence of an excess of galaxies with
L(1.4) GHz < 2 x 10^22 W/Hz. This result seems to indicate a star forming
population and is a result similar to that found recently by Owen et al. (2005)
for the merging cluster A2125. In addition we find that the radio luminosity
function for early-type galaxies (E and S0) below log P(1.4) = 22.5 is lower
than that found for a composite cluster environment (Ledlow & Owen, 1996) but
is similar to the early-type RLF for clusters in the centre of the Shapley
Super cluster (Venturi et al. 2000) which are believed to be in the latter
stages of merging. This result implies that the cores of superclusters are
environments where radio emission, particularly resultant from AGN, is
suppressed in the later stages of merging. Thus, radio observations of clusters
might be sensitive indicators of the precise merger stage of the cluster but
more observational evidence is still required to establish this trend.


title: A Logical Model and Data Placement Strategies for MEMS Storage Devices

abstract:
  MEMS storage devices are new non-volatile secondary storages that have
outstanding advantages over magnetic disks. MEMS storage devices, however, are
much different from magnetic disks in the structure and access characteristics.
They have thousands of heads called probe tips and provide the following two
major access facilities: (1) flexibility: freely selecting a set of probe tips
for accessing data, (2) parallelism: simultaneously reading and writing data
with the set of probe tips selected. Due to these characteristics, it is
nontrivial to find data placements that fully utilize the capability of MEMS
storage devices. In this paper, we propose a simple logical model called the
Region-Sector (RS) model that abstracts major characteristics affecting data
retrieval performance, such as flexibility and parallelism, from the physical
MEMS storage model. We also suggest heuristic data placement strategies based
on the RS model and derive new data placements for relational data and
two-dimensional spatial data by using those strategies. Experimental results
show that the proposed data placements improve the data retrieval performance
by up to 4.0 times for relational data and by up to 4.8 times for
two-dimensional spatial data of approximately 320 Mbytes compared with those of
existing data placements. Further, these improvements are expected to be more
marked as the database size grows.


title: Robust Recovery of Signals From a Structured Union of Subspaces

abstract:
  Traditional sampling theories consider the problem of reconstructing an
unknown signal $x$ from a series of samples. A prevalent assumption which often
guarantees recovery from the given measurements is that $x$ lies in a known
subspace. Recently, there has been growing interest in nonlinear but structured
signal models, in which $x$ lies in a union of subspaces. In this paper we
develop a general framework for robust and efficient recovery of such signals
from a given set of samples. More specifically, we treat the case in which $x$
lies in a sum of $k$ subspaces, chosen from a larger set of $m$ possibilities.
The samples are modelled as inner products with an arbitrary set of sampling
functions. To derive an efficient and robust recovery algorithm, we show that
our problem can be formulated as that of recovering a block-sparse vector whose
non-zero elements appear in fixed blocks. We then propose a mixed
$\ell_2/\ell_1$ program for block sparse recovery. Our main result is an
equivalence condition under which the proposed convex algorithm is guaranteed
to recover the original signal. This result relies on the notion of block
restricted isometry property (RIP), which is a generalization of the standard
RIP used extensively in the context of compressed sensing. Based on RIP we also
prove stability of our approach in the presence of noise and modelling errors.
  A special case of our framework is that of recovering multiple measurement
vectors (MMV) that share a joint sparsity pattern. Adapting our results to this
context leads to new MMV recovery methods as well as equivalence conditions
under which the entire set can be determined efficiently.


title:
Lower Bounds for Embedding into Distributions over Excluded Minor Graph
  Families

abstract:
  It was shown recently by Fakcharoenphol et al that arbitrary finite metrics
can be embedded into distributions over tree metrics with distortion O(log n).
It is also known that this bound is tight since there are expander graphs which
cannot be embedded into distributions over trees with better than Omega(log n)
distortion.
  We show that this same lower bound holds for embeddings into distributions
over any minor excluded family. Given a family of graphs F which excludes minor
M where |M|=k, we explicitly construct a family of graphs with treewidth-(k+1)
which cannot be embedded into a distribution over F with better than Omega(log
n) distortion. Thus, while these minor excluded families of graphs are more
expressive than trees, they do not provide asymptotically better approximations
in general. An important corollary of this is that graphs of treewidth-k cannot
be embedded into distributions over graphs of treewidth-(k-3) with distortion
less than Omega(log n).
  We also extend a result of Alon et al by showing that for any k, planar
graphs cannot be embedded into distributions over treewidth-k graphs with
better than Omega(log n) distortion.


title: Effects of free will and massive opinion in majority rule model

abstract:
  We study the effects of free will and massive opinion of multi-agents in a
majority rule model wherein the competition of the two types of opinions is
taken into account. To address this issue, we consider two specific models
(model I and model II) involving different opinion-updating dynamics. During
the opinion-updating process, the agents either interact with their neighbors
under a majority rule with probability $1-q$, or make their own decisions with
free will (model I) or according to the massive opinion (model II) with
probability $q$. We investigate the difference of the average numbers of the
two opinions as a function of $q$ in the steady state. We find that the
location of the order-disorder phase transition point may be shifted according
to the involved dynamics, giving rise to either smooth or harsh conditions to
achieve an ordered state. For the practical case with a finite population size,
we conclude that there always exists a threshold for $q$ below which a full
consensus phase emerges. Our analytical estimations are in good agreement with
simulation results.


title: Phase Diagram of the Dirac Spectrum at Nonzero Chemical Potential

abstract:
  The Dirac spectrum of QCD with dynamical fermions at nonzero chemical
potential is characterized by three regions, a region with a constant
eigenvalue density, a region where the eigenvalue density shows oscillations
that grow exponentially with the volume and the remainder of the complex plane
where the eigenvalue density is zero. In this paper we derive the phase diagram
of the Dirac spectrum from a chiral Lagrangian. We show that the constant
eigenvalue density corresponds to a pion condensed phase while the strongly
oscillating region is given by a kaon condensed phase. The normal phase with
nonzero chiral condensate but vanishing Bose condensates coincides with the
region of the complex plane where there are no eigenvalues.


title:
Observation of a New Magnetic Response in 3-Dimensional Split Ring
  Resonators under Normal Incidence

abstract:
  So far, research in the field of metamaterials has been carried out largely
with arrays of flat, 2-dimensional structures. Here, we report a newly
identified magnetic resonance in Split Cylinder Resonators (SCRs), a
3-dimensional version of the Split Ring Resonator (SRR), which were fabricated
with the Proton Beam Writing technique. Experimental and numerical results
indicate a hitherto unobserved 3-dimensional resonance mode under normal
incidence at about 26 THz, when the SCR depth is approximately half the free
space wavelength. This mode is characterized by strong currents along the
cylinder axis which are concentrated at the cylinder gaps. Due to their
orientation, these axial currents give rise to a magnetic response under normal
incidence, which is not possible in shallow SRRs. Our results reveal new
behavior in the SRR structure which arises from a change in its aspect ratio.
Such new resonances can have a significant influence on the quest for
practical, 3-dimensional metamaterials.


title:
Bounds for the Transition Density of Time-Homogeneous Diffusion
  Processes

abstract:
  The paper presents new simple sharp bounds for transition density functions
for time-homogeneous diffusions processes. The bounds are obtained under mild
conditions on the drift and diffusion coefficients, extending and substantially
improving previous results in the literature which were limited to drifts
satisfying a linear growth condition. They lead to an asymptotic expression for
the transition density as the transition time approaches zero. While the focus
is on the one-dimensional case, an extension to multiple dimensions is
discussed. Results are illustrated by numerical examples.


title: Signatures of Pseudoscalar Photon Mixing in CMB Radiation

abstract:
  We model the effect of photon and ultra-light pseudoscalar mixing on the
propagation of electromagnetic radiation through the extragalactic medium. The
medium is modelled as a large number of magnetic domains, uncorrelated with one
another. We obtain an analytic expression for the different Stokes parameters
in the limit of small mixing angle. The different Stokes parameters are found
to increase linearly with the number of domains. We also verify this result by
direct numerical simulations. We use this formalism to estimate the effect of
pseudoscalar-photon mixing on the Cosmic Microwave Background (CMB)
polarization. We impose limits on the model parameters by the CMB observations.
We find that the currently allowed parameter range admits a CMB circular
polarization up to order $10^{-7}$.


title:
Spatiotemporal correlations of earthquakes in the continuum limit of the
  one-dimensional Burridge-Knopoff model

abstract:
  Spatiotemporal correlations of the one-dimensional spring-block
(Burridge-Knopoff) model of earthquakes, either with or without the viscosity
term, are studied by means of numerical computer simulations. The continuum
limit of the model is examined by systematically investigating the model
properties with varying the block-size parameter a toward a\to 0. The Kelvin
viscosity term is introduced so that the model dynamics possesses a sensible
continuum limit. In the presence of the viscosity term, many of the properties
of the original discrete BK model are kept qualitatively unchanged even in the
continuum limit, although the size of minimum earthquake gets smaller as a gets
smaller. One notable exception is the existence/non-existence of the
doughnut-like quiescence prior to the mainshock. Although large events of the
original discrete BK model accompany seismic acceleration together with a
doughnut-like quiescence just before the mainshock, the spatial range of the
doughnut-like quiescence becomes narrower as a gets smaller, and in the
continuum limit, the doughnut-like quiescence might vanish altogether. The
doughnut-like quiescence observed in the discrete BK model is then a phenomenon
closely related to the short-length cut-off scale of the model.


title:
Monte Carlo Simulations for Top Pair and Single Top Production at the
  Tevatron

abstract:
  Monte Carlo (MC) simulations are indispensable tools for top quark physics,
both at the current Tevatron collider and the upcoming Large Hadron Collider.
In this paper we review how the Tevatron experiments CDF and D0 utilize MC
simulations for top quark analyses. We describe the standard MC generators used
to simulate top quark pair and single top quark production, followed by a
discussion of methods to extract systematic uncertainties of top physics
results related to the MC generator choice. The paper also shows the special MC
requirements for some example top properties measurements at the Tevatron.


title: Could Dark Matter Interactions be an Alternative to Dark Energy ?

abstract:
  We study the global dynamics of the universe within the framework of the
Interacting Dark Matter (IDM) scenario. Assuming that the dark matter obeys the
collisional Boltzmann equation, we can derive analytical solutions of the
global density evolution, which can accommodate an accelerated expansion,
equivalent to either the {\em quintessence} or the standard $\Lambda$ models,
with the present time located after the inflection point. This is possible if
there is a disequilibrium between the DM particle creation and annihilation
processes with the former process dominating, which creates an effective source
term with negative pressure. Comparing the predicted Hubble expansion of one of
the IDM models (the simplest) with observational data we find that the
effective annihilation term is quite small, as suggested by a variety of other
recent experiments.


title:
A third order dispersive flow for closed curves into almost Hermitian
  manifolds

abstract:
  We discuss a short-time existence theorem of solutions to the initial value
problem for a third order dispersive flow for closed curves into a compact
almost Hermitian manifold. Our equations geometrically generalize a physical
model describing the motion of vortex filament. The classical energy method
cannot work for this problem since the almost complex structure of the target
manifold is not supposed to be parallel with respect to the Levi-Civita
connection. In other words, a loss of one derivative arises from the covariant
derivative of the almost complex structure. To overcome this difficulty, we
introduce a bounded pseudodifferential operator acting on sections of the
pullback bundle, and eliminate the loss of one derivative from the partial
differential equation of the dispersive flow.


title:
Another tetraquark structure in the $\pi^+ \chi_{c1}$ invariant mass
  distribution

abstract:
  In this article, we assume that there exists a scalar hidden charm tetraquark
state in the $\pi^+ \chi_{c1}$ invariant mass distribution, and study its mass
using the QCD sum rules. The numerical result $M_{Z}=(4.36\pm0.18) \rm{GeV}$ is
consistent with the mass of the Z(4250). The Z(4250) may be a tetraquark state,
other possibilities, such as a hadro-charmonium resonance and a
$D_1^+\bar{D}^0+ D^+\bar{D}_1^0$ molecular state are not excluded.


title: Exact Calculations of Membrane Areas with Simple Models

abstract:
  The distinction between the true total area and the projected area is
elucidated with soluble models which represent the membrane as a self-avoiding
string on a plane. Constraining the total area to a predetermined value changes
the averages very significantly. The latter are calculated exactly from the
generating functions of self-avoiding walks and are shown as functions of
activities $q$ and $r$ related to temperature $T=\pm 1/\log (q)$ and lateral
force $f=-\log (r)$. The constraint makes the partition functions and averages
valid for all $q,r >0$ and reduces the ratio of $A_{tot}$ to the projected area
$L$. High temperature divergences are supressed. Possible applications to
simulated bilayers/membranes are discussed.


title:
Gamma-ray burst contributions to constraining the evolution of dark
  energy

abstract:
  We explore the gamma-ray bursts' (GRBs') contributions in constraining the
dark energy equation of state (EOS) at high ($1.8 < z < 7$) and at middle
redshifts ($0.5 < z < 1.8$) and estimate how many GRBs are needed to get
substantial constraints at high redshifts. We estimate the constraints with
mock GRBs and mock type Ia supernovae (SNe Ia) for comparisons. When
constraining the dark energy EOS in a certain redshift range, we allow the dark
energy EOS parameter to vary only in that redshift bin and fix EOS parameters
elsewhere to -1. We find that it is difficult to constrain the dark energy EOS
beyond the redshifts of SNe Ia with GRBs unless some new luminosity relations
for GRBs with smaller scatters are discovered. However, at middle redshifts,
GRBs have comparable contributions with SNe Ia in constraining the dark energy
EOS.


title:
Transverse Wave Propagation in Relativistic Two-fluid Plasmas around
  Schwarzschild-de Sitter Black Hole

abstract:
  We investigate transverse electromagnetic waves propagating in a plasma
influenced by the gravitational field of the Schwarzschild-de Sitter black
hole. Applying 3+1 spacetime split we derive the relativistic two-fluid
equations to take account of gravitational effects due to the event horizon and
describe the set of simultaneous linear equations for the perturbations. We use
a local approximation to investigate the one-dimensional radial propagation of
Alfv\'en and high frequency electromagnetic waves. We derive the dispersion
relation for these waves and solve it for the wave number $k$ numerically.


title: Wormhole geometry from real feasible matter sources

abstract:
  We provide a prescription of real feasible sources that supply fuel to
construct a traversable wormhole. A class of exact solutions for
Einstein-Maxwell field equations describing wormhole with an anisotropic matter
distribution has been presented. The anisotropy plays a crucial role for the
existence of the spacetime comprising wormhole geometry.


title:
From Capillary Condensation to Interface Localization Transitions in
  Colloid Polymer Mixtures Confined in Thin Film Geometry

abstract:
  Monte Carlo simulations of the Asakura-Oosawa (AO) model for colloid-polymer
mixtures confined between two parallel repulsive structureless walls are
presented and analyzed in the light of current theories on capillary
condensation and interface localization transitions. Choosing a polymer to
colloid size ratio of q=0.8 and studying ultrathin films in the range of D=3 to
D=10 colloid diameters thickness, grand canonical Monte Carlo methods are used;
phase transitions are analyzed via finite size scaling, as in previous work on
bulk systems and under confinement between identical types of walls. Unlike the
latter work, inequivalent walls are used here: while the left wall has a
hard-core repulsion for both polymers and colloids, at the right wall an
additional square-well repulsion of variable strength acting only on the
colloids is present. We study how the phase separation into colloid-rich and
colloid-poor phases occurring already in the bulk is modified by such a
confinement. When the asymmetry of the wall-colloid interaction increases, the
character of the transition smoothly changes from capillary condensation-type
to interface localization-type. The critical behavior of these transitions is
discussed, as well as the colloid and polymer density profiles across the film
in the various phases, and the correlation of interfacial fluctuations in the
direction parallel to the confining walls. The experimental observability of
these phenomena also is briefly discussed.


title:
Exclusive $B \rar \rho \ell^+ \ell^-$ Decay in the Standard Model with
  Fourth--Generation

abstract:
  We investigate the influence of the fourth generation of quarks on the
branching ratio, the CP-asymmetry and the polarization asymmetries in $B \rar
\rho \ell^+ \ell^-$ decay. Taking $|V_{t'd}V_{t'b}|\sim 0.001$ with phase about
$10^\circ$, which is consistent with the $sin2\phi_1$ of the CKM and the $B_d$
mixing parameter $\Delta m_{B_d}$, we obtain that for both ($\mu, \tau$)
channels the branching ratio is increased and the magnitude of CP-asymmetry and
polarization asymmetries decreased by the mass and mixing parameters of the 4th
generation of quarks . These results can serve as a good tool to search for new
physics effects, precisely, to search for the fourth generation of quarks($t',
b')$ via its indirect manifestations in loop diagrams.


title: Proton Driven Plasma Wakefield Acceleration

abstract:
  Plasma wakefield acceleration, either laser driven or electron-bunch driven,
has been demonstrated to hold great potential. However, it is not obvious how
to scale these approaches to bring particles up to the TeV regime. In this
paper, we discuss the possibility of proton-bunch driven plasma wakefield
acceleration, and show that high energy electron beams could potentially be
produced in a single accelerating stage.


title:
Application of Generalized Quantum Hydrodynamics In the Theory of
  Quantum Soliton's Evolution, Atom Structure and Lightning Ball

abstract:
  Quantum solitons are discovered with the help of generalized quantum
hydrodynamics (GQH). The solitons have the character of the stable quantum
objects in the self consistent electric field. These effects can be considered
as explanation of the existence of lightning balls. The delivered theory
demonstrates the great possibilities of the generalized quantum hydrodynamics
in investigation of the quantum solitons. The paper can be considered also as
comments and prolongation of the materials published in the known author`s
monograph (Boris V. Alexeev, Generalized Boltzmann Physical Kinetics. Elsevier.
2004). The theory leads to solitons as typical formations in the generalized
quantum hydrodynamics.
  Key words: Foundations of the theory of transport processes; The theory of
solitons; Generalized hydrodynamic equations; Foundations of quantum mechanics;
The theory of lightning balls.
  PACS: 67.55.Fa, 67.55.Hc


title: Phase transition of Two-timescale Two-temperature Spin-lattice Gas Model

abstract:
  We study phase transition of a nonequilibrium statistical-mechanical model,
in which two degrees of freedom with different time scales separated from each
other touch to their own heat bath. A general condition for finding anomalous
negative latent heat recently discovered is derived a from thermodynamic
argument. As a specific example, phase diagram of a spin-lattice gas model is
studied based on a mean-field analysis with replica method. While
configurational variables are spin and particle in this model, it is found that
the negative latent heat appears in a parameter region of the model,
irrespective of the order of their time scale. Qualitative differences in the
phase diagram are also discussed.


title: On the cohomological equation of magnetic flows

abstract:
  We consider a magnetic flow without conjugate points on a closed manifold $M$
with generating vector field $\G$. Let $h\in C^{\infty}(M)$ and let $\theta$ be
a smooth 1-form on $M$. We show that the cohomological equation \[\G(u)=h\circ
\pi+\theta\] has a solution $u\in C^{\infty}(SM)$ only if $h=0$ and $\theta$ is
closed. This result was proved in \cite{DP2} under the assumption that the flow
of $\G$ is Anosov.