title: Two-fluid model of the truncated Euler Equations

abstract:
  A phenomenological two-fluid model of the (time-reversible)
spectrally-truncated 3D Euler equation is proposed. The thermalized small
scales are first shown to be quasi-normal. The effective viscosity and thermal
diffusion are then determined, using EDQNM closure and Monte-Carlo numerical
computations. Finally, the model is validated by comparing its dynamics with
that of the original truncated Euler equation.


title: Random close packing of granular matter

abstract:
  We propose an interpretation of the random close packing of granular
materials as a phase transition, and discuss the possibility of experimental
verification.


title:
The 26 year-long X-ray light curve and the X-ray spectrum of the BL Lac
  Object 1E 1207.9+3945 in its brightest state

abstract:
  We studied the temporal and spectral evolution of the synchrotron emission
from the high energy peaked BL Lac object 1E 1207.9+3945. Two recent
observations have been performed by the XMM-Newton and Swift satellites; we
carried out X-ray spectral analysis for both of them, and photometry in
optical-ultraviolet filters for the Swift one. Combining the results thus
obtained with archival data we built the long-term X-ray light curve, spanning
a time interval of 26 years, and the Spectral Energy Distribution (SED) of this
source. The light curve shows a large flux increasing, about a factor of six,
in a time interval of a few years. After reaching its maximum in coincidence
with the XMM-Newton pointing in December 2000 the flux decreased in later
years, as revealed by Swift. The very good statistics available in the 0.5-10
keV XMM-Newton X-ray spectrum points out a highly significant deviation from a
single power law. A log-parabolic model with a best fit curvature parameter of
0.25 and a peak energy at ~1 keV describes well the spectral shape of the
synchrotron emission. The simultaneous fit of Swift UVOT and XRT data provides
a milder curvature (b~0.1) and a peak at higher energies (~15 keV), suggesting
a different state of source activity. In both cases UVOT data support the
scenario of a single synchrotron emission component extending from the
optical/UV to the X-ray band. New X-ray observations are important to monitor
the temporal and spectral evolution of the source; new generation gamma-ray
telescopes like AGILE and GLAST could for the first time detect its inverse
Compton emission.


title: A geometric construction for fractal sets and related linear operators

abstract: A way to add an extra dimension is briefly discussed.


title: On the dynamics of (left) orderable groups

abstract:
  We study left orderable groups by using dynamical methods. We apply these
techniques to study the space of orderings of these groups. We show for
instance that for the case of (non-Abelian) free groups, this space is
homeomorphic to the Cantor set. We also study the case of braid groups (for
which the space of orderings has isolated points but contains homeomorphic
copies of the Cantor set). To do this we introduce the notion of the Conradian
soul of an order as the maximal subgroup which is convex and restricted to
which the original ordering satisfies the so called conradian property, and we
elaborate on this notion.


title: Track-Based Particle Flow

abstract:
  One of the most important aspects of detector development for the ILC is a
good jet energy resolution sigma_E/E. To achieve the goal of high precision
measurements sigma_E/E = 0.30/sqrt(E(GeV)} is proposed. The particle flow
approach together with highly granular calorimeters is able to reach this goal.
This paper presents a new particle flow algorithm, called Track-Based particle
flow, and shows first performance results for 45 GeV jets based on full
detector simulation of the Tesla TDR detector model.


title: Statistics in the Landscape of Intersecting Brane Models

abstract:
  An approach towards a statistical survey of four dimensional supersymmetric
vacua in the string theory landscape is described and illustrated with three
examples of ensembles of intersecting D-brane models. The question whether it
is conceivable to make predictions based on statistical distributions is
discussed. Especially interesting in this context are possible correlations
between low energy observables. As an example we look at correlations between
properties of the gauge sector of intersecting D-brane models and Gepner model
constructions.


title: CP violation and final state interactions in B --> K pi pi decays

abstract:
  Effects of CP violation and of final state interactions between pairs of
pseudoscalar mesons are studied in three-body B+, B-, B0 and antiB0 decays into
K pi pi. An alternative approach to the isobar model for three-body B decays is
proposed. It is based on the QCD factorization approximation and the knowledge
of the meson-meson form factors. Some phenomenological charming penguin
amplitudes are needed to describe the branching fractions, direct CP
asymmetries of the quasi-two-body B --> K*(892) pi and B --> K0*(1430) pi
decays as well as the K pi effective mass and the helicity angle distributions.
The experimental branching fractions for the B --> K0*(1430) pi decay, obtained
by the Belle and BaBar collaborations using the isobar model, are larger than
our predictions by about 52 per cent.


title: Lattice Approach to Light Scalars

abstract:
  I report on lattice QCD calculations that study the properties of the a0 and
f0 mesons.


title: On the effective charge of hydrophobic polyelectrolytes

abstract:
  In this paper we analyze the behavior of hydrophobic polyelectrolytes. It has
been proposed that this system adopts a pearl-necklace structure reminiscent of
the Rayleigh instability of a charged droplet. Using a Poisson-Boltzmann
approach, we calculate the counterion distribution around a given pearl
assuming the latter to be penetrable for the counterions. This allows us to
calculate the effective electric charge of the pearl as a function of the
chemical charge. Our predictions are in very good agreement with the recent
experimental measurements of the effective charge by Essafi et al. (Europhys.
Lett. 71, 938 (2005)). Our results allow to understand the large deviation from
the Manning law observed in these experiments.


title: EW NLO corrections to pair production of top-squarks at the LHC

abstract:
  Presented are complete electroweak (EW) corrections at ${\cal
O}(\alpha\alpha_{\mathrm s}^{\mathrm 2})$ to top-squark pair production at the
Large Hadron Collider (LHC) within the framework of the Minimal Supersymmetric
Standard Model (MSSM). At this order, effects from the interference of EW and
QCD contributions have to be taken into account. Also photon-induced top-squark
production is considered as additionnal partonic channel which arises from the
non-zero photon density in the proton. Furthermore, the impact of MSSM
parameters on the EW corrections is analyzed.


title: How does gas cool in DM halos?

abstract:
  In order to study the process of cooling in dark-matter (DM) halos and assess
how well simple models can represent it, we run a set of radiative SPH
hydrodynamical simulations of isolated halos, with gas sitting initially in
hydrostatic equilibrium within Navarro-Frenk-White (NFW) potential wells. [...]
After having assessed the numerical stability of the simulations, we compare
the resulting evolution of the cooled mass with the predictions of the
classical cooling model of White & Frenk and of the cooling model proposed in
the MORGANA code of galaxy formation. We find that the classical model predicts
fractions of cooled mass which, after about two central cooling times, are
about one order of magnitude smaller than those found in simulations. Although
this difference decreases with time, after 8 central cooling times, when
simulations are stopped, the difference still amounts to a factor of 2-3. We
ascribe this difference to the lack of validity of the assumption that a mass
shell takes one cooling time, as computed on the initial conditions, to cool to
very low temperature. [...] The MORGANA model [...] better agrees with the
cooled mass fraction found in the simulations, especially at early times, when
the density profile of the cooling gas is shallow. With the addition of the
simple assumption that the increase of the radius of the cooling region is
counteracted by a shrinking at the sound speed, the MORGANA model is also able
to reproduce for all simulations the evolution of the cooled mass fraction to
within 20-50 per cent, thereby providing a substantial improvement with respect
to the classical model. Finally, we provide a very simple fitting function
which accurately reproduces the cooling flow for the first ~10 central cooling
times. [Abridged]


title:
Thermodynamical properties of hairy black holes in n spacetimes
  dimensions

abstract:
  The issue concerning the existence of exact black hole solutions in presence
of non vanishing cosmological constant and scalar fields is reconsidered. With
regard to this, in investigating no-hair theorem violations, exact solutions of
gravity having as a source an interacting and conformally coupled scalar field
are revisited in arbitrary dimensional non asymptotically flat space-times. New
and known hairy black hole solutions are discussed. The thermodynamical
properties associated with these solutions are investigated and the invariance
of the black hole entropy with respect to different conformal frames is proven.


title: Fast X-ray Oscillations During Magnetar Flares

abstract:
  The giant flares produced by highly magnetized neutron stars, "magnetars,"
are the brightest sources of high energy radiation outside our solar system.
Serendipitous observations with NASA's Rossi X-ray Timing Explorer (RXTE) of
the two most recent flares resulted in the discovery of high frequency
oscillations in their X-ray fluxes. The frequencies of these oscillations range
from about 20 Hz to as high as 1800 Hz, and may represent the first detection
of global oscillation modes of neutron stars. Here I will present an
observational and theoretical overview of these oscillations and discuss how
they might allow us to probe neutron star interiors and dense matter physics.


title:
Effect of charge modulation in (LaVO3)m(SrVO3)n superlattices on the
  insulator-metal transition

abstract:
  A series of epitaxial (LaVO3)6m(SrVO3)m superlattices having the same nominal
composition as La6/7Sr1/7VO3, a Mott-Hubbard insulator, were grown with
pulsed-laser deposition on [001]-oriented SrTiO3 substrates, and their
superlattice period was varied. When m=1, the insulating resistivity of
bulk-like La6/7Sr1/7VO3 is obtained; however, an increase in the periodicity
(m>=2) results in metallic samples. Comparison of the superlattice periodicity
with the coherence length of charge carriers in perovskite oxide
heterostructures are used to understand these observations. A
filling-controlled insulator-metal transition was induced by placing a single
dopant layer of SrVO3 within LaVO3 layers of varying thickness.


title: Supersymmetric LHC phenomenology without a light Higgs boson

abstract:
  After a brief discussion of the mass of the Higgs in supersymmetry, I
introduce \lambdaSUSY, a model with an extra chiral singlet superfield in
addition to the MSSM field content. The key features of the model are: the
superpotential W=\lambda S H_d H_u with a large coupling \lambda and the
resulting lightest Higgs with mass above 200GeV. The main part of my
contribution will be about how \lambdaSUSY manifests itself at the LHC.
Discoveries of gluino, squarks and in particular of the three lightest neutral
Higgs bosons are discussed.


title: Nonmonotonic energy harvesting efficiency in biased exciton chains

abstract:
  We theoretically study the efficiency of energy harvesting in linear exciton
chains with an energy bias, where the initial excitation is taking place at the
high-energy end of the chain and the energy is harvested (trapped) at the other
end. The efficiency is characterized by means of the average time for the
exciton to be trapped after the initial excitation. The exciton transport is
treated as the intraband energy relaxation over the states obtained by
numerically diagonalizing the Frenkel Hamiltonian that corresponds to the
biased chain. The relevant intraband scattering rates are obtained from a
linear exciton-phonon interaction. Numerical solution of the Pauli master
equation that describes the relaxation and trapping processes, reveals a
complicated interplay of factors that determine the overall harvesting
efficiency. Specifically, if the trapping step is slower than or comparable to
the intraband relaxation, this efficiency shows a nonmonotonic dependence on
the bias: it first increases when introducing a bias, reaches a maximum at an
optimal bias value, and then decreases again because of dynamic (Bloch)
localization of the exciton states. Effects of on-site (diagonal) disorder,
leading to Anderson localization, are addressed as well.


title: Collisional stability of fermionic Feshbach molecules

abstract:
  Using a Feshbach resonance, we create ultracold fermionic molecules starting
from a Bose-Fermi atom gas mixture. The resulting mixture of atoms and weakly
bound molecules provides a rich system for studying few-body collisions because
of the variety of atomic collision partners for molecules; either bosonic,
fermionic, or distinguishable atoms. Inelastic loss of the molecules near the
Feshbach resonance is dramatically affected by the quantum statistics of the
colliding particles and the scattering length. In particular, we observe a
molecule lifetime as long as 100 ms near the Feshbach resonance.


title: Singularities of Brill-Noether loci for vector bundles on a curve

abstract:
  In this paper we consider the singularities of the varieties parameterizing
stable vector bundles of fixed rank and degree with sections on a smooth curve
of genus at least two. In particular, we extend results of Y. Laszlo, and of
the second author, regarding the singularities of generalized theta divisors.


title:
Stellar populations in the bulges of S0s and the formation of S0
  galaxies

abstract:
  The stellar populations in the bulges of S0s, together with the galaxies'
dynamics, masses and globular clusters, contain very interesting clues about
their formation. I present here recent evidence suggesting that S0s are the
descendants of fading spirals whose star formation ceased.


title: Can LHC Test the See-Saw Mechanism?

abstract:
  We discuss the prospects for detecting right-handed neutrinos which are
introduced in the see-saw mechanism at future colliders. This requires a very
accurate cancellation between contributions from different right-handed
neutrinos to the light neutrino mass matrix. We search for possible symmetries
behind this cancellation and find that they have to include lepton number
conservation. Light neutrino masses can be generated as a result of small
symmetry-breaking perturbations. The impact of these perturbations on LHC
physics is negligible, so that the mechanism of neutrino mass generation and
LHC physics are decoupled in general. In constrained cases, accelerator
observables and neutrino masses and mixings can be correlated.


title: On the arithmetical rank of a special class of minimal varieties

abstract:
  We study the arithmetical ranks and the cohomological dimensions of an
infinite class of Cohen-Macaulay varieties of minimal degree. Among these we
find, on the one hand, infinitely many set-theoretic complete intersections, on
the other hand examples where the arithmetical rank is arbitrarily greater than
the codimension.


title: Cosmological implications of the Higgs mass measurement

abstract:
  We assume the validity of the Standard Model up to an arbitrary high-energy
scale and discuss what information on the early stages of the Universe can be
extracted from a measurement of the Higgs mass. For Mh < 130 GeV, the Higgs
potential can develop an instability at large field values. From the absence of
excessive thermal Higgs field fluctuations we derive a bound on the reheat
temperature after inflation as a function of the Higgs and top masses. Then we
discuss the interplay between the quantum Higgs fluctuations generated during
the primordial stage of inflation and the cosmological perturbations, in the
context of landscape scenarios in which the inflationary parameters scan. We
show that, within the large-field models of inflation, it is highly improbable
to obtain the observed cosmological perturbations in a Universe with a light
Higgs. Moreover, independently of the inflationary model, the detection of
primordial tensor perturbations through the B-mode of CMB polarization and the
discovery of a light Higgs can simultaneously occur only with exponentially
small probability, unless there is new physics beyond the Standard Model.


title: RHIC Low-Energy Challenges and Plans

abstract:
  There is significant interest in RHIC heavy ion collisions at
$\sqrt{s_{NN}}=$5--50 GeV, motivated by a search for the QCD phase transition
critical point. The lowest energies for this search are well below the nominal
RHIC gold injection collision energy of $\sqrt{s_{NN}}=19.6$ GeV. There are
several operations challenges at RHIC in this regime, including longitudinal
acceptance, magnet field quality, lattice control, and luminosity monitoring.
We report on the status of work to address these challenges, including results
from beam tests of low energy RHIC operations with protons and gold, and
potential improvements from different beam cooling scenarios.


title: Measuring Fine Tuning In Supersymmetry

abstract:
  The solution to fine tuning is one of the principal motivations for
supersymmetry. However constraints on the parameter space of the Minimal
Supersymmetric Standard Model (MSSM) suggest it may also require fine tuning
(although to a much lesser extent). To compare this tuning with different
extensions of the Standard Model (including other supersymmetric models) it is
essential that we have a reliable, quantitative measure of tuning. We review
the measures of tuning used in the literature and propose an alternative
measure. We apply this measure to several toy models and the MSSM with some
intriguing results.


title: Quantum Shared Broadcasting

abstract:
  A generalization of quantum broadcasting protocol is presented. Here the goal
is to copy an unknown input state into two subsystems which partially overlap.
We show that the possibility of implementing these protocols strongly depends
upon the overlap among the subsystems. Conditions for approximated shared
broadcasting are analyzed.


title: Submersions and effective descent of etale morphisms

abstract:
  Using the flatification by blow-up result of Raynaud and Gruson, we obtain
new results for submersive and subtrusive morphisms. We show that universally
subtrusive morphisms, and in particular universally open morphisms, are
morphisms of effective descent for the fibered category of etale morphisms. Our
results extend and supplement previous treatments on submersive morphisms by
Grothendieck, Picavet and Voevodsky. Applications include the universality of
geometric quotients and the elimination of noetherian hypotheses in many
instances.


title:
Moments of nucleon distribution amplitudes from irreducible three-quark
  operators

abstract:
  Semi-exclusive and exclusive processes are becoming more and more important
in high energy physics since they are excellently suited to study the internal
hadronic structure. To analyze such processes the knowledge of the hadron
distribution amplitudes, which are universal for different reactions, is
essential. Only rather indirect information on these nonperturbative functions
can be obtained from measurements. In this work we report on a lattice QCD
computation of moments of nucleon distribution amplitudes using suitable
three-quark operators. However, these operators have to be renormalized and the
mixing is even more complicated than in the continuum. Using the symmetry group
of the hypercubic lattice we therefore derive and implement irreducibly
transforming three-quark operators, which allow us to control the mixing
pattern and will finally lead to quantitative predictions in the MSbar scheme.
We present preliminary results for leading-twist and next-to-leading twist
nucleon distribution amplitudes based on the QCDSF/UKQCD simulations with 2
flavors of dynamical clover fermions.


title: Dimensional Reduction Applied to Non-Supersymmetric Theories

abstract:
  We consider regularisation of a Yang-Mills theory by Dimensional Reduction
(DRED). In particular, the anomalous dimensions of fermion masses and gauge
coupling are computed to four-loop order. We put special emphasis on the
treatment of evanescent couplings which appear when DRED is applied to
non-supersymmetric theories. We highlight the importance of distinguishing
between the evanescent and the real couplings. Considering the special case of
a Super-Yang-Mills theory, we find that Dimensional Reduction is sufficient to
preserve Supersymmetry in our calculations.


title: The Rapid Outbursting Star GM Cep: An EX-or in Tr 37?

abstract:
  We present optical, IR and millimeter observations of the solar-type star
13-277, also known as GM Cep, in the 4 Myr-old cluster Tr 37. GM Cep
experiences rapid magnitude variations of more than 2 mag at optical
wavelengths. We explore the causes of the variability, which seem to be
dominated by strong increases in the accretion, being similar to EX-or
episodes. The star shows high, variable accretion rates (up to ~10$^{-6}$
Msun/yr), signs of powerful winds, and it is a very fast rotator (Vsini~43
km/s). Its strong mid-IR excesses reveal a very flared disk and/or a remnant
envelope, most likely out of hydrostatic equilibrium. The 1.3 millimeter fluxes
suggest a relatively massive disk (Mdisk~0.1 Msun). Nevertheless, the
millimeter mass is not enough to sustain increased accretion episodes over
large timescales, unless the mass is underestimated due to significant grain
growth. We finally explore the possibility of GM Cep having a binary companion,
which could trigger disk instabilities producing the enhanced accretion
episodes.


title: O(a^2) cutoff effects in Wilson fermion simulations

abstract:
  We show that the size of the O(a^2) flavour violating cutoff artifacts that
have been found to affect the value of the neutral pion mass in simulations
with maximally twisted Wilson fermions is controlled by a continuum QCD
quantity that is fairly large and is determined by the dynamical mechanism of
spontaneous chiral symmetry breaking. One can argue that the neutral pion mass
is the only physical quantity blurred by such cutoff effects. O(a^2)
corrections of this kind are also present in standard Wilson fermion
simulations, but they can either affect the determination of the pion mass or
be shifted from the latter to other observables, depending on the way the
critical mass is evaluated.


title: Indirect dark matter searches with H.E.S.S

abstract:
  The annihilations of WIMPs produce high energy gamma-rays in the final state.
These high energy gamma-rays may be detected by IACTs such as the H.E.S.S.
array of Imaging Atmospheric Cherenkov telescopes. Besides the popular targets
such as the Galactic Center or galaxy clusters such as VIRGO, dwarf spheroidal
galaxies are privileged targets for Dark Matter annihilation signal searches.
H.E.S.S. observations on the Sagittarius dwarf galaxy are presented. The
modelling of the Dark Matter halo profile of Sagittarius dwarf is discussed.
Constraints on the velocity-weighted cross section of Dark Matter particles are
derived in the framework of Supersymmetric and Kaluza-Klein models. The future
of H.E.S.S. will be briefly discussed.


title: Soft diffraction at the LHC: a partonic interpretation

abstract:
  We present a `new generation' model for high energy proton-proton `soft'
interactions. It allows for a full set of multi-Pomeron vertices, as well as
including multichannel eikonal scattering. It describes the behaviour of the
proton-proton total, sigma(total), and elastic dsigma(el)/dt, cross sections
together with those for low and high mass proton dissociation. Although the
model contains a comprehensive set of multi-Pomeron diagrams, it has a simple
partonic interpretation. Including the more complicated multi-Pomeron vertices
reduces the absorptive effects as compared to the predictions in which only the
triple-Pomeron vertex is considered. Tuning the model to describe the available
`soft' data in the CERN ISR - Tevatron energy range, we predict the total,
elastic, single- and double-diffractive dissociation cross sections at the LHC
energy. An inescapable consequence of including multichannel eikonal and
multi-Pomeron effects is that the total cross section is expected to be lower
than before: indeed, we find sigma(total) \simeq 90 mb at the LHC energy. We
also present differential forms of the cross sections. In addition we calculate
soft diffractive central production.


title: A Continuity Theorem for Stinespring's Dilation

abstract:
  We show a continuity theorem for Stinespring's dilation: two completely
positive maps between arbitrary C*-algebras are close in cb-norm iff we can
find corresponding dilations that are close in operator norm. The proof
establishes the equivalence of the cb-norm distance and the Bures distance for
completely positive maps. We briefly discuss applications to quantum
information theory.


title: Regression estimation from an individual stable sequence

abstract:
  We consider univariate regression estimation from an individual (non-random)
sequence $(x_1,y_1),(x_2,y_2), ... \in \real \times \real$, which is stable in
the sense that for each interval $A \subseteq \real$, (i) the limiting relative
frequency of $A$ under $x_1, x_2, ...$ is governed by an unknown probability
distribution $\mu$, and (ii) the limiting average of those $y_i$ with $x_i \in
A$ is governed by an unknown regression function $m(\cdot)$.
  A computationally simple scheme for estimating $m(\cdot)$ is exhibited, and
is shown to be $L_2$ consistent for stable sequences $\{(x_i,y_i)\}$ such that
$\{y_i\}$ is bounded and there is a known upper bound for the variation of
$m(\cdot)$ on intervals of the form $(-i,i]$, $i \geq 1$. Complementing this
positive result, it is shown that there is no consistent estimation scheme for
the family of stable sequences whose regression functions have finite
variation, even under the restriction that $x_i \in [0,1]$ and $y_i$ is
binary-valued.


title: A Categorical Construction of Ultrafilters

abstract:
  Ultrafilters are useful mathematical objects having applications in
nonstandard analysis, Ramsey theory, Boolean algebra, topology, and other areas
of mathematics. In this note, we provide a categorical construction of
ultrafilters in terms of the inverse limit of an inverse family of finite
partitions; this is an elementary and intuitive presentation of a consequence
of the profiniteness of Stone spaces. We then apply this construction to answer
a question of Rosinger posed in arXiv:0709.0084v2 in the negative.


title:
Scaling and low energy constants in lattice QCD with N_f=2 maximally
  twisted Wilson quarks

abstract:
  We report on the scaling of basic hadronic observables in lattice QCD with
N_f=2 maximally twisted Wilson dynamical quarks. We give preliminary results
for some of the Gasser-Leutwyler low energy constants, the chiral condensate
and the average mass of u and d quarks.


title:
Dynamical instability of the XY spiral state of ferromagnetic
  condensates

abstract:
  We calculate the spectrum of collective excitations of the XY spiral state
prepared adiabatically or suddenly from a uniform ferromagnetic F=1 condensate.
For spiral wavevectors past a critical value, spin wave excitation energies
become imaginary indicating a dynamical instability. We construct phase
diagrams as functions of spiral wavevector and quadratic Zeeman energy.


title: Density estimation from an individual numerical sequence

abstract:
  This paper considers estimation of a univariate density from an individual
numerical sequence. It is assumed that (i) the limiting relative frequencies of
the numerical sequence are governed by an unknown density, and (ii) there is a
known upper bound for the variation of the density on an increasing sequence of
intervals. A simple estimation scheme is proposed, and is shown to be $L_1$
consistent when (i) and (ii) apply. In addition it is shown that there is no
consistent estimation scheme for the set of individual sequences satisfying
only condition (i).


title: nuMSM and its experimental tests

abstract:
  $\nu$MSM is a minimal renormalizable extension of the Standard Model by right
handed neutrinos. This model explains the neutrino oscillations and provides a
candidate for the Dark Matter and a mechanism of baryon number generation in
the Early Universe. We discuss here existing constraints on the model and
possible consequences for astrophysical and laboratory experiments.


title: Search for rare b-meson decays at CDF

abstract:
  We report on the search for $B^0_s\to\mu^+\mu^-$, $B^0_d\to\mu^+\mu^-$ decays
and $b\to s \mu^+\mu^-$ transitions in exclusive decays of B mesons using the
CDF II detector at the Fermilab Tevatron Collider. Using 2 fb$^{-1}$ of Run II
data we find upper limits on the branching fractions
$\mathcal{B}(B^0_s\to\mu^+\mu^-)<5.8\times 10^{-8}$ and
$\mathcal{B}(B^0_d\to\mu^+\mu^-)<1.8\times 10^{-8}$ at 95% confidence level.
The results for the branching fractions of the $b\to s \mu^+\mu^-$ transitions
using 924 pb$^{-1}$ of Run II data are
$\mathcal{B}(B^+\to\mu^+\mu^-K^+)=(0.60\pm0.15\pm0.04)\times 10^{-6}$,
$\mathcal{B}(B^0_d\to\mu^+\mu^-K^{*0})=(0.82\pm0.31\pm0.10)\times 10^{-6}$ and
$\mathcal{B}(B^0_s\to \mu^+\mu^-\phi)/\mathcal{B}(B^0_s\to J/\psi\phi) <
2.61\times 10^{-3}$ at 95% confidence level.


title: On the mass formula and Wigner and curvature energy terms

abstract:
  The efficiency of different mass formulas derived from the liquid drop model
including or not the curvature energy, the Wigner term and different powers of
the relative neutron excess $I$ has been determined by a least square fitting
procedure to the experimental atomic masses assuming a constant
R$_{0,charge}$/A$^{1/3}$ ratio. The Wigner term and the curvature energy can be
used independently to improve the accuracy of the mass formula. The different
fits lead to a surface energy coefficient of around 17-18 MeV, a relative sharp
charge radius r$_0$ of 1.22-1.23 fm and a proton form-factor correction to the
Coulomb energy of around 0.9 MeV.


title:
Electronic band structure and exchange coupling constants in ACr2X4
  spinels

abstract:
  We present the results of band structure calculations for ACr2X4 (A=Zn, Cd,
Hg and X=O, S, Se) spinels. Effective exchange coupling constants between Cr
spins are determined by fitting the energy of spin spirals to a classical
Heisenberg model. The calculations reproduce the change of the sign of the
dominant nearest-neighbor exchange interaction J1 from antiferromagnetic in
oxides to ferromagnetic in sulfides and selenides. It is verified that the
ferromagnetic contribution to J1 is due to indirect hopping between Cr t2g and
eg states via X p states. Antiferromagnetic coupling between 3-rd Cr neighbors
is found to be important in all the ACr2X4 spinels studied, whereas other
interactions are much weaker. The results are compared to predictions based on
the Goodenough-Kanamori rules of superexchange.


title: Generic Trace Semantics via Coinduction

abstract:
  Trace semantics has been defined for various kinds of state-based systems,
notably with different forms of branching such as non-determinism vs.
probability. In this paper we claim to identify one underlying mathematical
structure behind these "trace semantics," namely coinduction in a Kleisli
category. This claim is based on our technical result that, under a suitably
order-enriched setting, a final coalgebra in a Kleisli category is given by an
initial algebra in the category Sets. Formerly the theory of coalgebras has
been employed mostly in Sets where coinduction yields a finer process semantics
of bisimilarity. Therefore this paper extends the application field of
coalgebras, providing a new instance of the principle "process semantics via
coinduction."


title: Stochastic Integrals and Evolution Equations with Gaussian Random Fields

abstract:
  The paper studies stochastic integration with respect to Gaussian processes
and fields. It is more convenient to work with a field than a process: by
definition, a field is a collection of stochastic integrals for a class of
deterministic integrands. The problem is then to extend the definition to
random integrands. An orthogonal decomposition of the chaos space of the random
field, combined with the Wick product, leads to the \Ito-Skorokhod integral,
and provides an efficient tool to study the integral, both analytically and
numerically. For a Gaussian process, a natural definition of the integral
follows from a canonical correspondence between random processes and a special
class of random fields. Some examples of the corresponding stochastic
differential equations are also considered.


title: Stochastic suspensions of heavy particles

abstract:
  Turbulent suspensions of heavy particles in incompressible flows have gained
much attention in recent years. A large amount of work focused on the impact
that the inertia and the dissipative dynamics of the particles have on their
dynamical and statistical properties. Substantial progress followed from the
study of suspensions in model flows which, although much simpler, reproduce
most of the important mechanisms observed in real turbulence. This paper
presents recent developments made on the relative motion of a pair of particles
suspended in time-uncorrelated and spatially self-similar Gaussian flows. This
review is complemented by new results. By introducing a time-dependent Stokes
number, it is demonstrated that inertial particle relative dispersion recovers
asymptotically Richardson's diffusion associated to simple tracers. A
perturbative (homogeneization) technique is used in the small-Stokes-number
asymptotics and leads to interpreting first-order corrections to tracer
dynamics in terms of an effective drift. This expansion implies that the
correlation dimension deficit behaves linearly as a function of the Stokes
number. The validity and the accuracy of this prediction is confirmed by
numerical simulations.


title:
Right-Chiral Sneutrino LSP in mSUGRA: Event characteristics of NLSP at
  the LHC

abstract:
  We study a supersymmetric scenario where the lighter tau-sneutrino is the
lightest supersymmetric particle, while the lighter stau-state is the next
lightest. Such a scenario can be motivated within the framework of minimal
supergravity, with just the addition of a right-chiral neutrino superfield.
Such a spectrum leads to rather unusual signals of supersymmetry, showing
stable tracks of the stau in the muon chambers. We study the event
characteristics of the long-lived staus at the LHC and demonstrate that the
stau tracks can be distinguished from the muonic ones through proper kinematic
cuts which also enable one to remove all standard model backgrounds.


title: Locally Compact Objects in Exact Categories

abstract:
  We identify two categories of locally compact objects on an exact category A.
They correspond to the well-known constructions of the Beilinson category lim A
and the Kato category k(A). We study their mutual relations and compare the two
constructions. We prove that lim A is an exact category, which gives to this
category a very convenient feature when dealing with K-theoretical invariants.
It is natural therefore to consider the Beilinson category lim A as the most
convenient candidate to the role of the category of locally compact objects
over an exact category. We also show that the categories Ind_{aleph_0}(C),
Pro_{aleph_0}(C) of countably indexed ind/pro-objects over any category C can
be described as localizations of categories of diagrams over C.


title: Intracellular microrheology of motile Amoeba proteus

abstract:
  The motility of motile Amoeba proteus was examined using the technique of
passive particle tracking microrheology, with the aid of newly-developed
particle tracking software, a fast digital camera and an optical microscope. We
tracked large numbers of endogeneous particles in the amoebae, which displayed
subdiffusive motion at short time scales, corresponding to thermal motion in a
viscoelastic medium, and superdiffusive motion at long time scales due to the
convection of the cytoplasm. Subdiffusive motion was characterised by a
rheological scaling exponent of 3/4 in the cortex, indicative of the
semiflexible dynamics of the actin fibres. We observed shear-thinning in the
flowing endoplasm, where exponents increased with increasing flow rate; i.e.
the endoplasm became more fluid-like. The rheology of the cortex is found to be
isotropic, reflecting an isotropic actin gel. A clear difference was seen
between cortical and endoplasmic layers in terms of both viscoelasticity and
flow velocity, where the profile of the latter is close to a Poiseuille flow
for a Newtonian fluid.


title: Thermal effects in exciton harvesting in biased one-dimensional systems

abstract:
  The study of energy harvesting in chain-like structures is important due to
its relevance to a variety of interesting physical systems. Harvesting is
understood as the combination of exciton transport through intra-band exciton
relaxation (via scattering on phonon modes) and subsequent quenching by a trap.
Previously, we have shown that in the low temperature limit different
harvesting scenarios as a function of the applied bias strength (slope of the
energy gradient towards the trap) are possible \cite{Vlaming07}. This paper
generalizes the results for both homogeneous and disordered chains to nonzero
temperatures. We show that thermal effects are appreciable only for low bias
strengths, particularly so in disordered systems, and lead to faster
harvesting.


title:
Monodromy transform approach in the theory of integrable reductions of
  Einstein's field equations and some applications

abstract:
  A brief sketch of the formulation of the monodromy transform approach and
corresponding integral equation methods as well as of various applications of
this approach for solution of integrable symmetry reductions of Einstein's
field equations is presented.


title:
Structural dependence of robustness and load tolerance in scale-free
  networks

abstract:
  The structure of complex networks in previous research has been widely
described as scale-free networks generated by the preferential attachment
model. However, the preferential attachment model does not take into account
the detailed topological property observed in real networks. Here we propose
the models of scale-free networks which can reproduce the topological
assortativity of real networks. With an identical degree distribution and
network size, we study the structural robustness and fragility as well as the
dynamic change of load intensity when nodes are successively removed under
random and various intentional attack strategies. We find that disassortative
networks are structurally robust against random attacks and highly
load-tolerant, while assortative networks are most resistant to intentional
attacks yet significantly fragile against random attacks.


title:
A possible source of spin-polarized electrons: The inert
  graphene/Ni(111) system

abstract:
  We report on an investigation of spin-polarized secondary electron emission
from the chemically inert system: graphene/Ni(111). An ordered passivated
graphene layer (monolayer of graphite, MG) was formed on Ni(111) surface via
cracking of propylene gas. The spin-polarization of the secondary electrons
obtained from this system upon photoemission is only slightly lower than the
one from the clean Ni surface, but does not change upon large oxygen exposure.
These results suggest to use such passivated Ni(111) surface as a source of
spin-polarized electrons stable against adsorption of reactive gases.


title: Superposition of fields of two Reissner - Nordstrom sources

abstract:
  In this paper we present a 5-parametric family of static asymptotically flat
solutions for the superposed gravitational and electromagnetic fields of two
Reissner-Nordstr\"om sources with arbitrary parameters -- masses, charges and
separating distance. A procedure for solving of the linear singular integral
equation form of the electrovacuum Einstein - Maxwell equations for stationary
axisymmetric fields is described in detail. The 4-parametric family of
equilibrium configurations of two Reissner-Nordstr\"om sources (one of which
should be a black hole and another one -- a naked singularity) presented in our
recent paper \cite{Alekseev-Belinski:2007} arises after a restriction of the
parameters of the 5-parametric solution presented here by the equilibrium
condition which provides the absence in the solution of conical points on the
symmetry axis between the sources.


title: Are there compact heavy four-quark bound states?

abstract:
  We present an exact method to study four-quark systems based on the
hyperspherical harmonics formalism. We apply it to several physical systems of
interest containing two heavy and two light quarks using different quark-quark
potentials. Our conclusions mark the boundaries for the possible existence of
compact, non-molecular, four-quark bound states. While $QQ\bar n \bar n$ states
may be stable in nature, the stability of $Q\bar Qn \bar n$ states would imply
the existence of quark correlations not taken into account by simple quark
dynamical models


title: Gluon Saturation and Black Hole Criticality

abstract:
  We discuss the recent proposal in hep-th/0611312 where it was shown that the
critical anomalous dimension associated to the onset of non-linear effects in
the high energy limit of QCD coincides with the critical exponent governing the
radius of the black hole formed in the spherically symmetric collapse of a
massless scalar field. We argue that a new essential ingredient in this mapping
between gauge theory and gravity is continuous self-similarity, not present in
the scalar field case but in the spherical collapse of a perfect fluid with
barotropic equation of state. We identify this property with geometric scaling,
present in DIS data at small values of Bjorken x. We also show that the
Choptuik exponent in dimension five tends to the QCD critical value in the
traceless limit of the energy momentum tensor.


title:
Variations of the high-level Balmer line spectrum of the helium-strong
  star Sigma Orionis E

abstract:
  Using the high-level Balmer lines and continuum, we trace the density
structure of two magnetospheric disk segments of the prototypical Bp star sigma
Ori E (B2p) as these segments occult portions of the star during the rotational
cycle. High-resolution spectra of the Balmer lines >H9 and Balmer edge were
obtained on seven nights in January-February 2007 at an average sampling of
0.01 cycles. We measured equivalent width variations due to the star
occultations by two disk segments 0.4 cycles apart and constructed differential
spectra of the migrations of the corresponding absorptions across the Balmer
line profiles. We first estimated the rotational and magnetic obliquity angles.
We then simulated the observed Balmer jump variation using the model atmosphere
codes synspec/circus and evaluated the disk geometry and gas thermodynamics. We
find that the two occultations are caused by two disk segments. The first of
these transits quickly, indicating that the segment resides in a range of
distances, perhaps 2.5-6R_star, from the star. The second consists of a more
slowly moving segment situated closer to the surface and causing two
semi-resolved absorbing maxima. During its transit this segment brushes across
the star's "lower" limb. Judging from the line visibility up to H23-H24 during
the occultations, both disk segments have mean densities near 10^{12} cm^{-3}
and are opaque in the lines and continuum. They have semiheights less than 1/2
of a stellar radius, and their temperatures are near 10500K and 12000K,
respectively. In all, the disks of Bp stars have a much more complicated
geometry than has been anticipated, as evidenced by their (sometimes)
non-coplanarity, de-centerness, and from star to star, differences in disk
height.


title:
Using $K^0\pi^-\to\pi^-$ transitions to compute $K\to(\pi\pi)_{I=0}$
  decay amplitudes at NLO in the chiral expansion

abstract:
  It is proposed to compute matrix elements for the (unphysical) $K^0\pi^-\to
\pi^-$ transition to determine the next-to-leading order low energy constants
of the weak chiral Lagrangian. This allows us to evaluate $K\to(\pi\pi)_{I=0}$
decay amplitudes at this level of precision. This approach has several
significant advantages over the use of $K\to\pi\pi$ transitions, most notably
the elimination of s-channel disconnected diagrams and the use of fewer
inversions.


title: The equation of state with nonzero chemical potential for 2+1 flavors

abstract:
  We present results for the QCD equation of state with nonzero chemical
potential using the Taylor expansion method with terms up to sixth order in the
expansion. Our calculations are performed on asqtad 2+1 quark flavor lattices
at $N_t=4$.


title:
A formula for the coincidence Reidemeister trace of selfmaps on bouquets
  of circles

abstract:
  We give a formula for the coincidence Reidemeister trace of selfmaps on
bouquets of circles in terms of the Fox calculus. Our formula reduces the
problem of computing the coincidence Reidemeister trace to the problem of
distinguishing doubly twisted conjugacy classes in free groups.


title: Unconventional interaction between vortices in a polarized Fermi gas

abstract:
  Recently, a homogeneous superfluid state with a single gapless Fermi surface
was predicted to be the ground state of an ultracold Fermi gas with spin
population imbalance in the regime of molecular Bose-Einstein condensation. We
study vortices in this novel state using a symmetry-based effective field
theory, which captures the low-energy physics of gapless fermions and
superfluid phase fluctuations. This theory is applicable to all spin-imbalanced
ultracold Fermi gases in the superfluid regime, regardless of whether the
original fermion pairing interaction is weak or strong. We find a remarkable,
unconventional form of the interaction between vortices. The presence of
gapless fermions gives rise to a spatially oscillating potential, akin to the
RKKY indirect-exchange interaction in non-magnetic metals. We compare the
parameters of the effective theory to the experimentally measurable quantities
and further discuss the conditions for the verification of the predicted new
feature. Our study opens up an interesting question as to the nature of the
vortex lattice resulting from the competition between the usual repulsive
logarithmic (2D Coulomb) and predominantly attractive fermion-induced
interactions.


title:
An analysis of the abstracts presented at the annual meetings of the
  Society for Neuroscience from 2001 to 2006

abstract:
  We extracted and processed abstract data from the SFN annual meeting
abstracts during the period 2001-2006, using techniques and software from
natural language processing, database management, and data visualization and
analysis. An important first step in the process was the application of data
cleaning and disambiguation methods to construct a unified database, since the
data were too noisy to be of full utility in the raw form initially available.
The resulting co-author graph in 2006, for example, had 39,645 nodes (with an
estimated 6% error rate in our disambiguation of similar author names) and
13,979 abstracts, with an average of 1.5 abstracts per author, 4.3 authors per
abstract, and 5.96 collaborators per author (including all authors on shared
abstracts). Recent work in related areas has focused on reputational indices
such as highly cited papers or scientists and journal impact factors, and to a
lesser extent on creating visual maps of the knowledge space. In contrast,
there has been relatively less work on the demographics and community
structure, the dynamics of the field over time to examine major research trends
and the structure of the sources of research funding. In this paper we examined
each of these areas in order to gain an objective overview of contemporary
neuroscience. Some interesting findings include a high geographical
concentration of neuroscience research in north eastern United States, a
surprisingly large transient population (60% of the authors appear in only one
out of the six studied years), the central role played by the study of
neurodegenerative disorders in the neuroscience community structure, and an
apparent growth of behavioral/systems neuroscience with a corresponding
shrinkage of cellular/molecular neuroscience over the six year period.


title: Neutrino time travel

abstract:
  We discuss causality properties of extra-dimensional theories allowing for
effectively superluminal bulk shortcuts. Such shortcuts for sterile neutrinos
have been discussed as a solution to the puzzling LSND and MiniBooNE neutrino
oscillation results. We focus here on the sub-category of asymmetrically warped
brane spacetimes and argue that scenarios with two extra dimensions may allow
for timelike curves which can be closed via paths in the extra-dimensional
bulk. In principle sterile neutrinos propagating in the extra dimension may be
manipulated in a way to test the chronology protection conjecture
experimentally.


title: Lepton Flavor Violation at the LHC

abstract:
  In supersymmetric scenarios, the seesaw mechanism involving heavy
right-handed neutrinos implies sizable lepton flavor violation (LFV) in the
slepton sector. We discuss the potential of detecting LFV processes at the LHC
in mSUGRA+seesaw scenarios and for general mixing in either the left- or
right-handed slepton sector. The results are compared with the sensitivity of
rare LFV mu -> e gamma decay experiments.


title: Angle dependent quasiparticle weights in correlated metals

abstract:
  The variation in the quasiparticle weight $Z$ on moving around the fermi
surface in correlated metals is studied theoretically. Our primary example is a
heavy Fermi liquid treated within the standard hybridization mean field theory.
The most dramatic variation in the quasiparticle weight happens in situations
where the hybridization vanishes along certain directions in momentum space.
Such a "hybridization node" is demonstrated for a simplified model of a
Cerium-based cubic heavy electron metal. We show that the quasiparticle weight
varies from almost unity in some directions, to values approaching zero in
others. This is accompanied by a similar variation in the quasiparticle
effective mass. Some consequences of such hybridization nodes and the
associated angle dependence are explored. Comparisons to somewhat similar
phenomena in the normal metallic state of the cuprate materials are discussed.
A phenomenological picture of the pseudogap state in the cuprates with a large
Fermi surface with a severely anisotropic spectral weight is explored.


title: Equilibrium Properties of Mixtures of Bosons and Fermions

abstract:
  Partial Quantum Nearest Neighbor Probability Density Functions (PQNNPDF's)
are formulated for the purpose of determining the behavior of quantum mixed
systems in equilibrium in a manner analogous to that provided for classical
multi-component systems. Developments in partial quantum m-tuplet distribution
functions, a generalization of the partial quantum radial distribution
function, along with their relationship to PQNNPDF's, are briefly elucidated.
The calculation of statistical thermodynamic properties of quantum mixtures is
presented for arbitrary material systems. Application to the limiting case of
dilute, weakly correlated quantum gas mixtures has been outlined and the second
virial coefficient is derived. The case of dilute strongly degenerate mixtures
is also addressed, providing an expression for the PQNNPDF applicable in this
thermodynamic regime.


title: Chern-Simons Modified General Relativity: Conserved charges

abstract:
  We construct the conserved charges (mass and angular momentum) of the
Chern-Simons modified General Relativity in asymptotically flat and Anti-de
Sitter (AdS) spacetimes. Our definition is based on background Killing
symmetries and reduces to the known expressions in the proper limits.


title: Heuristic decomposition of cones in molecular conformational space

abstract:
  In a previous work arXiv:physics/0611108v2, it was shown that the volume
spanned by a molecular system in its conformational space can be effectively
bounded by a polyhedral cone, this cone is described by means of a simple
combinatorial formula. On the other hand it was constructed a transversal graph
structure encoding the region of conformational space accessible to the system.
  From the information in this graph, it is possible to decompose the main cone
into a hierarchy of smaller ones that are more manageable, and are
progressively more tightly bound to the region in which the system evolves.


title: Smectic ordering in athermal systems of rod-like triblock copolymers

abstract:
  The phase behavior of the system of parallel rigid triblock copolymers is
examined using the second-virial density functional theory. The triblock
particle consists of two identical infinitely thin hard rods of finite lengths
on the opposite ends of one central hard cylinder with nonzero length and
diameter. Stability analyses and free energy calculations show that the system
of parallel particles can form not only uniform nematic and smectic A phases,
but a smectic-C phase too. The stability and structure of the tilted structure
is controlled by only the diameter and the length of the central cylinder
segment. Interestingly, the diameter effects only the layer tilting and the
periodicity, but not the packing fraction of the nematic to smectic-C
transition. For all values of cylinder length the usual smectic-A and smectic-C
transitions compete with each other and no nematic-columnar transition is
observed. At low and high cylinder length the smectic-A phase is stabilized
first, while the smectic C is the most stable for intermediate length values.


title: Lens space surgeries and L-space homology spheres

abstract:
  We describe necessary and sufficient conditions for a knot in an L-space to
have an L-space homology sphere surgery. We use these conditions to reformulate
a conjecture of Berge about which knots in S^3 admit lens space surgeries.


title: Sleeping on the Job: Energy-Efficient Broadcast for Radio Networks

abstract:
  We address the problem of minimizing power consumption when performing
reliable broadcast on a radio network under the following popular model. Each
node in the network is located on a point in a two dimensional grid, and
whenever a node sends a message, all awake nodes within distance r receive the
message. In the broadcast problem, some node wants to successfully send a
message to all other nodes in the network even when up to a 1/2 fraction of the
nodes within every neighborhood can be deleted by an adversary. The set of
deleted nodes is carefully chosen by the adversary to foil our algorithm and
moreover, the set of deleted nodes may change periodically. This models
worst-case behavior due to mobile nodes, static nodes losing power or simply
some points in the grid being unoccupied. A trivial solution requires each node
in the network to be awake roughly 1/2 the time, and a trivial lower bound
shows that each node must be awake for at least a 1/n fraction of the time. Our
first result is an algorithm that requires each node to be awake for only a
1/sqrt(n) fraction of the time in expectation. Our algorithm achieves this
while ensuring correctness with probability 1, and keeping optimal values for
other resource costs such as latency and number of messages sent. We give a
lower-bound that shows that this reduction in power consumption is
asymptotically optimal when latency and number of messages sent must be
optimal. If we can increase the latency and messages sent by only a log*n
factor we give a Las Vegas algorithm that requires each node to be awake for
only a (log*n)/n expected fraction of the time; we give a lower-bound showing
that this second algorithm is near optimal. Finally, we show how to ensure
energy-efficient broadcast in the presence of Byzantine faults.


title: Modularity-Maximizing Network Communities via Mathematical Programming

abstract:
  In many networks, it is of great interest to identify "communities",
unusually densely knit groups of individuals. Such communities often shed light
on the function of the networks or underlying properties of the individuals.
Recently, Newman suggested "modularity" as a natural measure of the quality of
a network partitioning into communities. Since then, various algorithms have
been proposed for (approximately) maximizing the modularity of the partitioning
determined.
  In this paper, we introduce the technique of rounding mathematical programs
to the problem of modularity maximization, presenting two novel algorithms.
More specifically, the algorithms round solutions to linear and vector
programs. Importantly, the linear programing algorithm comes with an a
posteriori approximation guarantee: by comparing the solution quality to the
fractional solution of the linear program, a bound on the available "room for
improvement" can be obtained. The vector programming algorithm provides a
similar bound for the best partition into two communities. We evaluate both
algorithms using experiments on several standard test cases for network
partitioning algorithms, and find that they perform comparably or better than
past algorithms.


title: On Torsion Fields in Higher Derivative Quantum Gravity

abstract:
  We consider axial torsion fields which appear in higher derivative quantum
gravity. It is shown, in general, that the torsion field possesses states with
two spins, one and zero, with different masses. The first-order formulation of
torsion fields is performed. Projection operators extracting pure spin and mass
states are given. We obtain the Lagrangian in the framework of the first order
formalism and energy-momentum tensor. The effective interaction of torsion
fields with electromagnetic fields is discussed. The Hamiltonian form of the
first order torsion field equation is given.


title: O'Raifeartaigh models with spontaneous R-symmetry breaking

abstract:
  O'Raifeartaigh models with general R-charge assignments can have vacua where
both supersymmetry and R-symmetry are spontaneously broken. Most of these vacua
are metastable because the potential shows a runaway behaviour. We explain the
relation between runaway directions and R-symmetry.


title:
Isoperimetric regions in spherical cones and Yamabe constants of
  $M\times S^1$

abstract:
  Given closed Riemannian manifold $(M^n, g)$ of positive Ricci curvature
$Ricci(g) \geq (n-1)g$ we study isoperimetric regions on the spherical cone
over $M$. When $g$ is Einstein we use this to compute the Yamabe constant of
$(M \times {\bf R}, g + dt^2)$ and so to obtain lower bounds for the Yamabe
invariant of $M\times S^1$.


title: Spookytechnology and Society

abstract:
  New technologies based on the exploitation of so-called "second order"
quantum phenomena - such as quantum entanglement - deserve a public-friendly,
rational, and sexy name. Spookytechnology is that unifying term. From
historical and motivational perspectives, this name has greater value than the
many variations of quantum this and quantum that presently used. As many
already believe, the pursuit of spookytechnology has profound implications for
the development of the physical and information sciences and ultimately for
society at large. Spookytechnology will find its place in the increasingly
dense line of major technological revolutions of our time: quantum, info, bio,
nano, spooky.

categories: physics.pop-ph cond-mat.mtrl-sci physics.soc-ph quant-ph


title:
Detectability of CMB tensor B modes via delensing with weak lensing
  galaxy surveys

abstract:
  We analyze the possibility of delensing CMB polarization maps using
foreground weak lensing (WL) information. We build an estimator of the CMB
lensing potential out of optimally combined projected potential estimators to
different source redshift bins. Our estimator is most sensitive to the redshift
depth of the WL survey, less so to the shape noise level. Estimators built
using galaxy surveys like LSST and SNAP yield a 30-50% reduction in the lensing
B-mode power. We illustrate the potential advantages of a 21-cm survey by
considering a fiducial WL survey for which we take the redshift depth zmax and
the effective angular concentration of sources n as free parameters. For a
noise level of 1 muK arcmin in the polarization map itself, as projected for a
CMBPol experiment, and a beam with FWHM=10 arcmin, we find that going to
zmax=20 at n=100 gal/sqarcmin yields a delensing performance similar to that of
a quadratic lensing potential estimator applied to small-scale CMB maps: the
lensing B-mode contamination is reduced by almost an order of magnitude. In
this case, there is also a reduction by a factor of ~4 in the detectability
threshold of the tensor B-mode power. At this CMB noise level, there is little
gain from sources with zmax>20. The delensing gains are lost if the CMB beam
exceeds ~20 arcmin. The delensing efficiency and useful zmax depend acutely on
the CMB map noise level, but beam sizes below 10 arcmin do not help. Delensing
via foreground sources does not require arcminute-resolution CMB observations,
a substantial practical advantage over the use of CMB observables for
delensing.


title:
Low energy effective theory on a regularized brane in 6D gauged chiral
  supergravity

abstract:
  We derive the low energy effective theory on a brane in six-dimensional
chiral supergravity. The conical 3-brane singularities are resolved by
introducing cylindrical codimension one 4-branes whose interiors are capped by
a regular spacetime. The effective theory is described by the Brans-Dicke (BD)
theory with the BD parameter given by $\omega_{\rm BD}=1/2$. The BD field is
originated from a modulus which is associated with the scaling symmetry of the
system. If the dilaton potentials on the branes preserve the scaling symmetry,
the scalar field has an exponential potential in the Einstein frame. We show
that the time dependent solutions driven by the modulus in the four-dimensional
effective theory can be lifted up to the six-dimensional exact solutions found
in the literature. Based on the effective theory, we discuss a possible way to
stabilize the modulus to recover standard cosmology and also study the
implication for the cosmological constant problem.


title: Modulated Perturbations from Instant Preheating after new Ekpyrosis

abstract:
  We present a mechanism to transfer the spectrum of perturbations in a scalar
isocurvature field $\xi$ onto the matter content in the radiation era via
modulated, instant preheating after ekpyrosis. In this setup, $\xi$ determines
the coupling constant relevant for the decay of a preheat matter field into
Fermions. The resulting power spectrum is scale invariant if $\xi$ remains
close to a scaling solution in new ekpyrotic models of the universe; by
construction the spectrum is independent of the detailed physics near the
bounce. The process differs from the curvaton mechanism, which has been used
recently to revive the ekpyrotic scenario, in that no peculiar behavior of
$\xi$ shortly before or during the bounce is needed. In addition, a concrete
and efficient realization of reheating after ekpyrosis is provided; this
mechanism is not tied to ekpyrotic models, but could equally well be used in
other setups, for instance inflationary ones. We estimate non-Gaussianities and
find no additional contributions in the most simple realizations, in contrast
to models using the curvaton mechanism.


title:
Toward Empirical Constraints on the Global Redshifted 21 cm Brightness
  Temperature During the Epoch of Reionization

abstract:
  Preliminary results are presented from a simple, single-antenna experiment
designed to measure the all-sky radio spectrum between 100 and 200 MHz. The
system used an internal comparison-switching scheme to reduce non-smooth
instrumental contaminants in the measured spectrum to 75 mK. From the
observations, we place an initial upper limit of 450 mK on the relative
brightness temperature of the redshifted 21 cm contribution to the spectrum due
to neutral hydrogen in the intergalactic medium (IGM) during the epoch of
reionization, assuming a rapid transition to a fully ionized IGM at a redshift
of 8. With refinement, this technique should be able to distinguish between
slow and fast reionization scenarios. To constrain the duration of reionization
to dz > 2, the systematic residuals in the measured spectrum must be reduced to
3 mK.


title: Probing clumpy stellar winds with a neutron star

abstract:
  INTEGRAL, the European Space Agency's gamma-ray observatory, tripled the
number of super-giant high-mass X-ray binaries (sgHMXB) known in the Galaxy by
revealing absorbed and fast transient (SFXT) systems. In these sources,
quantitative constraints on the wind clumping of the massive stars could be
obtained from the study of the hard X-ray variability of the compact accreting
object. Hard X-ray flares and quiescent emission of SFXT systems have been
characterized and used to derive wind clump parameters. A large fraction of the
hard X-ray emission is emitted in the form of flares with a typical duration of
3 ks, frequency of 7 days and luminosity of 1E36 erg/s. Such flares are most
probably emitted by the interaction of a compact object orbiting at ~10 R* with
wind clumps (1E(22-23) g) representing a large fraction of the stellar
mass-loss rate. The density ratio between the clumps and the inter-clump medium
is 1E(2-4) in SFXT systems. The parameters of the clumps and of the inter-clump
medium, derived from the SFXT flaring behavior, are in good agreement with
macro-clumping scenario and line driven instability simulations. SFXT have
probably a larger orbital radius than classical sgHMXB.


title: Dynamics of Magnetized Spherical Accretion Flows

abstract:
  Transonic accretion flow with self-consistent treatment of random magnetic
field is presented.


title: Chern class identities from tadpole matching in type IIB and F-theory

abstract:
  In light of Sen's weak coupling limit of F-theory as a type IIB orientifold,
the compatibility of the tadpole conditions leads to a non-trivial identity
relating the Euler characteristics of an elliptically fibered Calabi-Yau
fourfold and of certain related surfaces. We present the physical argument
leading to the identity, and a mathematical derivation of a Chern class
identity which confirms it, after taking into account singularities of the
relevant loci. This identity of Chern classes holds in arbitrary dimension, and
for varieties that are not necessarily Calabi-Yau. Singularities are essential
in both the physics and the mathematics arguments: the tadpole relation may be
interpreted as an identity involving stringy invariants of a singular
hypersurface, and corrections for the presence of pinch-points. The
mathematical discussion is streamlined by the use of Chern-Schwartz-MacPherson
classes of singular varieties. We also show how the main identity may be
obtained by applying `Verdier specialization' to suitable constructible
functions.


title: A Freiman-type theorem for locally compact abelian groups

abstract:
  We prove a Freiman-type theorem for locally compact abelian groups. If A is a
subset of a locally compact abelian group with Haar measure m and m(nA) <
n^dm(A) for all n>d log d then we describe A in a way which is tight up to
logarithmic factors in d.


title: Micromagnetic Simulations of Ferromagnetic Rings

abstract:
  Thin nanomagnetic rings have generated interest for fundamental studies of
magnetization reversal and also for their potential in various applications,
particularly as magnetic memories. They are a rare example of a geometry in
which an analytical solution for the rate of thermally induced magnetic
reversal has been determined, in an approximation whose errors can be estimated
and bounded. In this work, numerical simulations of soft ferromagnetic rings
are used to explore aspects of the analytical solution. The evolution of the
energy near the transition states confirms that, consistent with analytical
predictions, thermally induced magnetization reversal can have one of two
intermediate states: either constant or soliton-like saddle configurations,
depending on ring size and externally applied magnetic field. The results
confirm analytical predictions of a transition in thermally activated reversal
behavior as magnetic field is varied at constant ring size. Simulations also
show that the analytic one dimensional model continues to hold even for wide
rings.


title: Topological defects and equation of state of gluon plasma

abstract:
  We show that the degrees of freedom associated with magnetic monopole- and
vortexlike gluonic configurations make a strong contribution to the anomaly of
the energy-momentum tensor of Yang-Mills theory in the deconfinement phase
immediately above the critical temperature. As is well known in
zero-temperature Yang-Mills theory, the monopoles and vortices are constituents
of a generic gluonic object in which the two neighbor monopoles are connected
together by a segment of vortex string. Our results provide evidence that the
monopole-vortex chains in SU(2) gauge theory and their SU(3) counterparts, the
monopole-vortex nets, are thermodynamically relevant degrees of freedom in the
gluonic plasma.


title:
Measurement of the inclusive B_s^0 -> X^+ l^- \nu semileptonic decay
  branching fraction

abstract:
  Inclusive semileptonic B_s^0 -> X^+ l^- \nu decays are studied for the first
time using a 23.6 fb^{-1} data sample collected on the Y(5S) resonance with the
Belle detector at the KEKB asymmetric energy e^+ e^- collider. These decays are
identified by the means of a lepton accompanied by a same-sign D_s^+ meson
originating from the other B_s^0 in the event. The semileptonic branching
fractions are measured in the electron and muon channels to be Bf(B_s^0 -> X^+
e^- \nu) = (10.9 \pm 1.0 \pm 0.9)% and Bf(B_s^0 -> X^+ \mu^- \nu) = (9.2 \pm
1.0 \pm 0.8)%, respectively. Assuming an equal electron and muon production
rate in B_s^0 decays, a combined fit yields an average leptonic branching
fraction Bf(B_s^0 -> X^+ l^- \nu) = (10.2 \pm 0.8 \pm 0.9)%.


title: Congruences among modular forms on U(2,2) and the Bloch-Kato conjecture

abstract:
  Let k be a positive integer divisible by 4, l>k a prime, and f an elliptic
cuspidal eigenform of weight k-1, level 4, and non-trivial character. Let
\rho_f be the l-adic Galois representation attached to f. In this paper we
provide evidence for the Bloch-Kato conjecture for a twist of the adjoint motif
of \rho_f in the following way. Let L(f,s) denote the symmetric square
L-function of f. We prove that (under certain conditions) the l-adic valuation
of the algebraic part of L(f, k) is no greater than the l-adic valuation of the
order of S, where S is (the Pontryagin dual of) the Selmer group attached to
the Galois module \ad^0\rho_f|_{G_K} (-1), and K= Q(i). Our method uses an idea
of Ribet in that we introduce an intermediate step and produce congruences
between CAP and non-CAP modular forms on the unitary group U(2,2).


title: The lightest neutralino in the MNSSM

abstract:
  We examine the allowed mass range of the lightest neutralino within the
Minimal Non--minimal Supersymmetric Standard Model. Being absolutely stable if
R-parity is conserved this lightest neutralino is a candidate for the dark
matter of the universe. We establish the theoretical upper bound on the
lightest neutralino mass and obtain an approximate solution for this mass.


title: On general flux backgrounds with localized sources

abstract:
  We derive new consistency conditions for string compactifications with
generic fluxes (RR, NSNS, geometrical) and localized sources (D-branes,
NS-branes, KK-monopoles). The constraints are all related by string dualities
and share a common origin in M-theory. We also find new sources of
instabilities. We discuss the importance of these conditions for the
consistency of the effective action and for the study of interpolating
solutions between vacua.


title: Simultaneous Estimation of Time Delays and Quasar Structure

abstract:
  We expand our Bayesian Monte Carlo method for analyzing the light curves of
gravitationally lensed quasars to simultaneously estimate time delays and
quasar structure including their mutual uncertainties. We apply the method to
HE1104-1805 and QJ0158-4325, two doubly-imaged quasars with microlensing and
intrinsic variability on comparable time scales. For HE1104-1805 the resulting
time delay of (Delta t_AB) = t_A - t_B = 162.2 -5.9/+6.3 days and accretion
disk size estimate of log(r_s/cm) = 15.7 -0.5/+0.4 at 0.2 micron in the rest
frame are consistent with earlier estimates but suggest that existing methods
for estimating time delays in the presence of microlensing underestimate the
uncertainties. We are unable to measure a time delay for QJ0158-4325, but the
accretion disk size is log(r_s/cm) = 14.9 +/- 0.3 at 0.3 micron in the rest
frame.


title:
Capacity of Linear Two-hop Mesh Networks with Rate Splitting,
  Decode-and-forward Relaying and Cooperation

abstract:
  A linear mesh network is considered in which a single user per cell
communicates to a local base station via a dedicated relay (two-hop
communication). Exploiting the possibly relevant inter-cell channel gains, rate
splitting with successive cancellation in both hops is investigated as a
promising solution to improve the rate of basic single-rate communications.
Then, an alternative solution is proposed that attempts to improve the
performance of the second hop (from the relays to base stations) by cooperative
transmission among the relay stations. The cooperative scheme leverages the
common information obtained by the relays as a by-product of the use of rate
splitting in the first hop. Numerical results bring insight into the conditions
(network topology and power constraints) under which rate splitting, with
possible relay cooperation, is beneficial. Multi-cell processing (joint
decoding at the base stations) is also considered for reference.


title:
A Chiral Schwinger model, its Constraint Structure and Applications to
  its Quantization

abstract:
  The Jackiw-Rajaraman version of the chiral Schwinger model is studied as a
function of the renormalization parameter. The constraints are obtained and
they are used to carry out canonical quantization of the model by means of
Dirac brackets. By introducing an additional scalar field, it is shown that the
model can be made gauge invariant. The gauge invariant model is quantized by
establishing a pair of gauge fixing constraints in order that the method of
Dirac can be used.


title: Geometric Aspects of Biological Sequence Comparison

abstract:
  We propose a general framework for converting global and local similarities
between biological sequences to quasi-metrics. In contrast to previous works,
our formulation allows asymmetric distances, originating from uneven weighting
of strings, that may induce non-trivial partial orders on sets of biosequences.
Furthermore, the $\ell^p$-type distances considered are more general than
traditional generalized string edit distances corresponding to the $\ell^1$
case, and enable conversion of sequence similarities to distances for a much
wider class of scoring schemes. Our constructions require much less restrictive
gap penalties than the ones regularly used. Numerous examples are provided to
illustrate the concepts introduced and their potential applications.


title:
Continuum of consciousness: Mind uploading and resurrection of human
  consciousness. Is there a place for physics, neuroscience and computers?

abstract:
  In this paper, I perform mental experiment to analyze hypothetical process of
mind uploading. That process suggested as a way to achieve resurrection of
human consciousness. Mind uploading can be seen as a migration process of the
core mental functions, which migrate from a human brain to an artificial
environment. To simulate the process, I suggest a topological approach which is
based on a formalism of information geometry. Geometrical formalism lets us
simulate the toy mind as geometrical structures as well as gives us powerful
geometrical and topological methods for analysis of the information system.
This approach leads to the insight about using holographic model as an analogy
for the mind migration to an artificial environment. This model represents the
toy mind functionality in terms of information geometry (as a geometrical
shape) on information manifold. Such shape can have distributed holographic
representation. This representation gives us delocalized representation of the
system. At the same time, the process of creating the holographic
representation gives us a strategy to migrate from original to an artificial
environment and back. The interface between brain and an environment is modeled
as an entropy flow which is defined as a geometrical flow on information
manifold. Such flow is an analogy of holography recording for the toy mind. The
opposite process of holography reconstruction is modeled by none-local
Hamiltonians defined on the information manifold.


title: The Nearby and Extremely Metal-Poor Galaxy CGCG 269-049

abstract:
  We present Hubble Space Telescope (HST) and Spitzer Space Telescope images
and photometry of the extremely metal-poor (Z = 0.03 Z_sol) blue dwarf galaxy
CGCG 269-049. The HST images reveal a large population of red giant and
asymptotic giant branch stars, ruling out the possibility that the galaxy has
recently formed. From the magnitude of the tip of the red giant branch, we
measure a distance to CGCG 269-049 of only 4.9 +/- 0.4 Mpc. The spectral energy
distribution of the galaxy between ~3.6 - 70 microns is also best fitted by
emission from predominantly ~10 Gyr old stars, with a component of thermal dust
emission having a temperature of 52 +/- 10 K. The HST and Spitzer photometry
indicate that more than 60% of CGCG 269-049's stellar mass consists of stars
~10 Gyr old, similar to other local blue dwarf galaxies. Our HST H-alpha image
shows no evidence of a supernova-driven outflow that could be removing metals
from the galaxy, nor do we find evidence that such outflows occurred in the
past. Taken together with CGCG 269-049's large ratio of neutral hydrogen mass
to stellar mass (~10), these results are consistent with recent simulations in
which the metal deficiency of local dwarf galaxies results mainly from
inefficient star formation, rather than youth or the escape of supernova
ejecta.


title:
A Unified Theory for the Atmospheres of the Hot and Very Hot Jupiters:
  Two Classes of Irradiated Atmospheres

abstract:
  We highlight the importance of gaseous TiO and VO opacity on the highly
irradiated close-in giant planets. The atmospheres of these planets naturally
fall into two classes that are somewhat analogous to the M- and L-type dwarfs.
Those that are warm enough to have appreciable opacity due to TiO and VO gases
we term the ``pM Class'' planets, and those that are cooler we term ``pL
Class'' planets. We calculate model atmospheres for these planets, including
pressure-temperature profiles, spectra, and characteristic radiative time
constants. We show that pM Class planets have hot stratospheres $\sim$2000 K
and appear ``anomalously'' bright in the mid infrared secondary eclipse, as was
recently found for planets HD 149026b and HD 209458b. This class of planets
absorbs incident flux and emits thermal flux from high in their atmospheres.
Consequently, they will have large day/night temperature contrasts and
negligible phase shifts between orbital phase and thermal emission light
curves, because radiative timescales are much shorter than possible dynamical
timescales. The pL Class planets absorb incident flux deeper in the atmosphere
where atmospheric dynamics will more readily redistribute absorbed energy. This
will lead to cooler day sides, warmer night sides, and larger phase shifts in
thermal emission light curves. Around a Sun-like primary this boundary occurs
at $\sim$0.04-0.05 AU. The eccentric transiting planets HD 147506b and HD
17156b alternate between the classes. Thermal emission in the optical from pM
Class planets is significant red-ward of 400 nm, making these planets
attractive targets for optical detection. The difference in the observed
day/night contrast between ups Andromeda b (pM Class) and HD 189733b (pL Class)
is naturally explained in this scenario. (Abridged.)


title: Products in Hopf-Cyclic Cohomology

abstract:
  We construct several pairings in Hopf-cyclic cohomology of (co)module
(co)algebras with arbitrary coefficients. The key ideas instrumental in
constructing these pairings are the derived functor interpretation of
Hopf-cyclic and equivariant cyclic (co)homology, and the Yoneda interpretation
of Ext-groups. As a special case of one of these pairings, we recover the
Connes-Moscovici characteristic map in Hopf-cyclic cohomology. We also prove
that this particular pairing, along with few others, would stay the same if we
replace the derived category of (co)cyclic modules with the homotopy category
of (special) towers of $X$-complexes, or the derived category of mixed
complexes.


title: Error Channels and the Threshold for Fault-tolerant Quantum Computation

abstract:
  This dissertation treats the topics of threshold calculation, ancilla
construction, and non-standard error models. Chapter 2 introduces background
material ranging from quantum mechanics to classical coding to thresholds for
quantum computation. In Chapter 3 numerical and analytical means are used to
generate estimates of and bounds on the threshold given an error model
described by a restricted stochastic Pauli channel. Chapter 4 develops a
simple, flexible means of estimating the threshold and applies it to some cases
of interest. Finally, a novel method of ancilla construction is proposed in
Chapter 5, and the difficulties associated with implementing it are discussed.


title:
Crystallography without crystals I: the common-line method for
  assembling a 3D intensity volume from single-particle scattering

abstract:
  We demonstrate that a common-line method can assemble a 3D oversampled
diffracted intensity distribution suitable for high-resolution structure
solution from a set of measured 2D diffraction patterns, as proposed in
experiments with an X-ray free electron laser (XFEL) (Neutze {\it et al.},
2000). Even for a flat Ewald sphere, we show how the ambiguities due to
Friedel's Law may be overcome. The method breaks down for photon counts below
about 10 per detector pixel, almost 3 orders of magnitude higher than expected
for scattering by a 500 kDa protein with an XFEL beam focused to a 0.1 micron
diameter spot. Even if 10**3 orientationally similar diffraction patterns could
be identified and added to reach the requisite photon count per pixel, the need
for about 10**6 orientational classes for high-resolution structure
determination suggests that about ~ 10**9 diffraction patterns must be
recorded. Assuming pulse and read-out rates of 100 Hz, such measurements would
require ~ 10**7 seconds, i.e. several months of continuous beam time.


title: Flow of a non-Newtonian fluids on a flat plate: I. boundary layer

abstract: This paper has been withdrawn by the authors as requested by the journal.


title: Scaling laws of solar and stellar flares

abstract:
  In this study we compile for the first time comprehensive data sets of solar
and stellar flare parameters, including flare peak temperatures T_p, flare peak
volume emission measures EM_p, and flare durations t_f from both solar and
stellar data, as well as flare length scales L from solar data. Key results are
that both the solar and stellar data are consistent with a common scaling law
of EM_p ~ T_p^4.7, but the stellar flares exhibit ~250 times higher emission
measures (at the same flare peak temperature). For solar flares we observe also
systematic trends for the flare length scale L(T_p) ~ T_p^0.9 and the flare
duration t_F(T_p) ~ T_p^0.9 as a function of the flare peak temperature. Using
the theoretical RTV scaling law and the fractal volume scaling observed for
solar flares, i.e., V(L) ~ L^2.4, we predict a scaling law of EM_p ~ T_p^4.3,
which is consistent with observations, and a scaling law for electron densities
in flare loops, n_p ~ T_p^2/L ~ T_p^1.1. The RTV-predicted electron densities
were also found to be consistent with densities inferred from total emission
measures, n_p=(EM_p/q_V*V)^1/2, using volume filling factors of q_V=0.03-0.08
constrained by fractal dimensions measured in solar flares. Our results affect
also the determination of radiative and conductive cooling times, thermal
energies, and frequency distributions of solar and stellar flare energies.


title: Slonczewski windmill with dissipation and asymmetry

abstract:
  J. Slonczewski invented spin-transfer effect in layered systems in 1996.
Among his first predictions was the regime of ``windmill motion'' of a
perfectly symmetric spin valve where the magnetizations of the layers rotate in
a fixed plane keeping the angle between them constant. Since ``windmill'' was
predicted to happen in the case of zero magnetic anisotropy, while in most
experimental setups the anisotropy is significant, the phenomenon was not a
subject of much research. However, the behavior of the magnetically isotropic
device is related to the interesting question of current induced ferromagnetism
and is worth more attention. Here we study the windmill regime in the presence
of dissipation, exchange interaction, and layer asymmetry. It is shown that the
windmill rotation is almost always destroyed by those effects, except for a
single special value of electric current, determined by the parameters of the
device.


title:
The chiral transition on a 24^3x10 lattice with N_f=2 clover sea quarks
  studied by overlap valence quarks

abstract:
  Overlap fermions are particularly well suited to study the finite temperature
dynamics of the chiral symmetry restoration transition of QCD, which might be
just an analytic crossover. Using gauge field configurations on a 24^3x10
lattice with N_f=2 flavours of dynamical Wilson-clover quarks generated by the
DIK collaboration, we compute the lowest 50 eigenmodes of the overlap Dirac
operator and try to locate the transition by fermionic means. We analyse the
spectral density, local chirality and localisation properties of the low-lying
modes and illustrate the changing topological and (anti-) selfdual structure of
the underlying gauge fields across the transition.


title:
Coherent Spin Manipulations of a Polarized Beam With a Localized RF
  Magnetic Field

abstract:
  The coherent manipulation of spin observables in storage rings provides
opportunities to test the application of some fundamental dynamical principles.
In this context, it is possible to confirm, using gauge invariance and Lorentz
invariance, a conjecture framed by A. M. Kondratenko concerning the "natural"
or "intrinsic" resonance strength applicable to a spin rotation from a
controlled Froissart-Stora sweep with an RF dipole magnet. The discussion
includes a brief treatment of the "forced" component of the resonance strength
associated with the effect of the betatron oscillations induced by the
operation of the RF diple and a discussion of the effective resonance strength
as a function of betatron tunes.


title: Electronic States of Magnetic Quantum Dots

abstract:
  We study quantum states of electrons in magnetically doped quantum dots as a
function of exchange coupling between electron and impurity spins, the strength
of Coulomb interaction, confining potential, and the number of electrons. The
magnetic phase diagram of quantum dots, doped with a large number of magnetic
Mn impurities, can be described by the energy gap in the spectrum of electrons
and the mean field electron-Mn exchange coupling. A competition between these
two parameters leads to a transition between spin-unpolarized and
spin-polarized states, in the absence of applied magnetic field. Tuning the
energy gap by electrostatic control of nonparabolicity of the confining
potential can enable control of magnetization even at the fixed number of
electrons. We illustrate our findings by directly comparing Mn-doped quantum
dots with parabolic and Gaussian confining potential.


title:
Phase transition between non-extremal and extremal Reissner-Nordstr\"om
  black holes

abstract:
  We discuss the phase transition between non-extremal and extremal
Reissner-Nordstr\"om black holes. This transition is considered as the
  $T \to 0$ limit of the transition between the non-extremal and near-extremal
black holes.
  We show that an evaporating process from non-extremal black hole to extremal
one is possible to occur, but its reverse process is not possible to occur
because of the presence of the maximum temperature.
  Furthermore, it is shown that the Hawking-Page phase transition between small
and large black holes unlikely occurs in the AdS Reissner-Nordstr\"om black
holes.


title: Graphical Representation of SUSY and Application to QFT

abstract:
  We present a graphical representation of the supersymmetry and the graphical
calculation. Calculation is demonstrated for 4D Wess-Zumino model and for Super
QED. The chiral operators are graphically expressed in an illuminating way. The
tedious part of SUSY calculation, due to manipulating chiral suffixes, reduces
considerably. The application is diverse.


title:
The separability of tripartite Gaussian state with amplification and
  amplitude damping

abstract:
  Tripartite three mode Gaussian state undergoes parametric amplification and
amplitude damping as well as thermal noise is studied. In the case of a state
totally symmetrically interacting with the environment, the time dependent
correlation matrix of the state in evolution is given. The conditions for fully
separability and fully entanglement of the final tripartite three mode Gaussian
state are worked out.


title: Rigidity of graph products of abelian groups

abstract:
  We show that if $G$ is a group and $G$ has a graph-product decomposition with
finitely-generated abelian vertex groups, then $G$ has two canonical
decompositions as a graph product of groups: a unique decomposition in which
each vertex group is a directly-indecomposable cyclic group, and a unique
decomposition in which each vertex group is a finitely-generated abelian group
and the graph satisfies the $T_0$ property. Our results build on results by
Droms, Laurence and Radcliffe.


title: Flow of a non-Newtonian fluids on a flat plate: II. heat transfer


title: On the automorphisms of a graph product of abelian groups

abstract:
  We study the automorphisms of a graph product of finitely-generated abelian
groups W. More precisely, we study a natural subgroup Aut* W of Aut W, with
Aut* W = Aut W whenever vertex groups are finite and in a number of other
cases. We prove a number of structure results, including a semi-direct product
decomposition of Aut* W in which one of the factors is Inn W. We also give a
number of applications, some of which are geometric in nature.


title: A Comparison Theorem and A Sharp Bound via the Ricci Flow

abstract:
  We prove a comparison theorem for the compact surfaces with negative Euler
characteristic via the Ricci flow.


title: Scattering of a Klein-Gordon particle by a Hulth\'en potential

abstract:
  The Klein-Gordon equation in the presence of a spatially one-dimensional
Hulth\'en potential is solved exactly and the scattering solutions are obtained
in terms of hypergeometric functions. The transmission coefficient is derived
by the matching conditions on the wavefunctions and the condition for the
existence of transmission resonances are investigated. It is shown how the
zero-reflection condition depends on the shape of the potential.


title:
Transmission resonances for a Dirac particle in a one-dimensional
  Hulth\'en potential

abstract:
  We have solved exactly the two-component Dirac equation in the presence of a
spatially one-dimensional Hulth\'en potential, and presented the Dirac spinors
of scattering states in terms of hypergeometric functions. We have calculated
the reflection and transmission coefficients by the matching conditions on the
wavefunctions, and investigated the condition for the existence of transmission
resonances. Furthermore, we have demonstrated how the transmission-resonance
condition depends on the shape of the potential.


title:
Observation of anomalous Upsilon(1S)pi+pi- and Upsilon(2S)pi+pi-
  production near the Upsilon(5S) resonance

abstract:
  We report the first observation of e+e- -> Upsilon(1S)pi+pi-,
Upsilon(2S)pi+pi-, and first evidence for e+e- -> Upsilon(3S)pi+pi-,
Upsilon(1S)K+K-, near the peak of the Upsilon(5S) resonance at sqrt{s}~10.87
GeV. The results are based on a data sample of 21.7 fb^-1 collected with the
Belle detector at the KEKB e+e- collider. Attributing the signals to the
Upsilon(5S) resonance, the partial widths Gamma(Upsilon(5S) -> Upsilon(1S)
pi+pi-) = 0.59 +- 0.04 (stat) +- 0.09 (syst) MeV and Gamma(Upsilon(5S) ->
Upsilon(2S) pi+pi-) = 0.85 +- 0.07 (stat) +- 0.16 (syst) MeV are obtained from
the observed cross sections. These values exceed by more than two orders of
magnitude the previously measured partial widths for dipion transitions between
lower Upsilon resonances.


title:
The Lightest Higgs Boson and Relic Neutralino in the MSSM with CP
  Violation

abstract:
  In a minimal supersymmetric extension of the standard model (MSSM) with
explicit CP violation a mass of the lightest Higgs boson H_1 in the range 7
GeV} < M_{H_1} < 10 GeV is experimentally allowed by present accelerator
limits. In the same scenario a lightest neutralino as light as 2.9 GeV can be a
viable dark matter candidate, provided that a departure from the usual GUT
relation among gaugino masses is assumed.


title: Baryons and the Chern-Simons term in holographic QCD with three flavors

abstract:
  We study dynamical baryons in the holographic QCD model of Sakai and Sugimoto
in the case of three flavors and with special interest in the construction of
the Chern-Simons (CS) term. The baryon classical solution in this model is
given by the BPST instanton, and we carry out the collective coordinate
quantization of the solution. The CS term should give rise to a first class
constraint which selects baryon states with right spins. However, the original
CS term written in terms of the CS 5-form does not work. We instead propose a
new CS term which is gauge invariant and is given as an integral over a six
dimensional space having as its boundary the original five dimensional
spacetime of the holographic model. Collective coordinate quantization using
our new CS term leads to correct baryon states and their mass formula.


title:
Thermodynamic Studies on Non Centrosymmetric Superconductors by AC
  Calorimetry under High Pressures

abstract:
  We investigated the non centrosymmetric superconductors CePt$_3$Si and UIr by
the ac heat capacity measurement under pressures. We determined the pressure
phase diagrams of these compounds. In CePt$_3$Si, the N\'{e}el temperature
$T_{\rm N}$ = 2.2 K decreases with increasing pressure and becomes zero at the
critical pressure $P_{\rm AF}$ $\simeq$ 0.6 GPa. On the other hand, the
superconducting phase exists in a wider pressure region from ambient pressure
to $P_{\rm AF}$ $\simeq$ 1.5 GPa. The phase diagram of CePt$_3$Si is very
unique and has never been reported before for other heavy fermion
superconductors. In UIr, the heat capacity shows an anomaly at the Curie
temperature $T_{\rm C1}$ = 46 K at ambient pressure, and the heat capacity
anomaly shifts to lower temperatures with increasing pressure. The present
pressure dependence of $T_{\rm C1}$ was consistent with the previous studies by
the resistivity and magnetization measurements. Previous ac magnetic
susceptibility and resistivity measurements suggested the existence of three
ferromagnetic phases, FM1-3. $C_{\rm ac}$ shows a bending structure at 1.98,
2.21, and 2.40 GPa .The temperatures where these anomalies are observed are
close to the phase boundary of the FM3 phase.


title:
Quantum criticality of the Lipkin-Meshkov-Glick Model in terms of
  fidelity susceptibility

abstract:
  We study the critical properties of the Lipkin-Meshkov-Glick Model in terms
of the fidelity susceptibility. By using the Holstein-Primakoff transformation,
we obtain explicitly the critical exponent of the fidelity susceptibility
around the second-order quantum phase transition point. Our results provide a
rare analytical case for the fidelity susceptibility in describing the
universality class in quantum critical behavior. The different critical
exponents in two phases are non-trivial results, indicating the fidelity
susceptibility is not always extensive.


title: Poisson statistics of eigenvalues in the hierarchical Anderson model

abstract:
  We study the eigenvalue statistics for the hieracharchial Anderson model of
Molchanov. We prove Poisson fluctuations at arbitrary disorder, when the the
model has spectral dimension d<1. The proof is based on Minami's technique and
we give an elementary exposition of the probabilistic arguments.


title:
Martingales, the Efficient Market Hypothesis, and Spurious Stylized
  Facts

abstract:
  The condition for stationary increments, not scaling, detemines long time
pair autocorrelations. An incorrect assumption of stationary increments
generates spurious stylized facts, fat tails and a Hurst exponent H_s=1/2, when
the increments are nonstationary, as they are in FX markets. The
nonstationarity arises from systematic uneveness in noise traders' behavior.
Spurious results arise mathematically from using a log increment with a
'sliding window'. We explain why a hard to beat market demands martingale
dynamics , and martingales with nonlinear variance generate nonstationary
increments. The nonstationarity is exhibited directly for Euro/Dollar FX data.
We observe that the Hurst exponent H_s generated by the using the sliding
window technique on a time series plays the same role as does Mandelbrot's
Joseph exponent. Finally, Mandelbrot originally assumed that the 'badly
behaved' second moment of cotton returns is due to fat tails, but that
nonconvergent behavior is instead direct evidence for nonstationary increments.
Summarizing, the evidence for scaling and fat tails as the basis for
econophysics and financial economics is provided neither by FX markets nor by
cotton price data.