title:
Large forward-backward asymmetry in B --> K mu+ mu- from new physics
  tensor operators

abstract:
  We study the constraints on possible new physics contribution to the
forward-backward asymmetry of muons, A_{FB}(q^2), in B --> K mu+ mu-. New
physics in the form of vector/axial-vector operators does not contribute to
A_{FB}(q^2) whereas new physics in the form of scalar/pseudoscalar operators
can enhance A_{FB}(q^2) only by a few per cent. However new physics the form of
tensor operators can take the peak value of A_{FB}(q^2) to as high as 40% near
the high-q^2 end point. In addition, if both scalar/pseudoscalar and tensor
operators are present, then A_{FB}(q^2) can be more than 15% for the entire
high-q^2 region q^2 > 15 GeV^2. The observation of significant A_{FB} would
imply the presence of new physics tensor operators, whereas its q^2 dependence
could further indicate the presence of new scalar/pseudoscalar physics.


title: On Peres approach to Fradkin-Bacry-Ruegg-Souriau's perihelion vector

abstract:
  We solve explicitely the differential system obtained by Peres for the
construction of a conserved vector associated to any central potential. We then
obtain a very direct access to the discontinuous behavior of this
Fradkin-Bacry-Ruegg-Souriau perihelion vector.


title:
Robust chaos with variable Lyapunov exponent in smooth one-dimensional
  maps

abstract:
  We present several new easy ways of generating smooth one-dimensional maps
displaying robust chaos, i.e., chaos for whole intervals of the parameter.
Unlike what happens with previous methods, the Lyapunov exponent of the maps
constructed here varies widely with the parameter. We show that the condition
of negative Schwarzian derivative, which was used in previous works, is not a
necessary condition for robust chaos. Finally we show that the maps constructed
in previous works have always the Lyapunov exponent $\ln 2$ because they are
conjugated to each other and to the tent map by means of smooth homeomorphisms.
In the methods presented here, the maps have variable Lyapunov coefficients
because they are conjugated through non-smooth homeomorphisms similar to
Minkowski's question mark function.


title:
A New Three-Algebra Representation for the {\cal N}=6 su(N)Xsu(N)
  Superconformal Chern-Simons Theory

abstract:
  Based on the realization of three-algebras in terms of algebra of matrices
and four-brackets [arXiv:0807.1570] we present the notion of u(N)-based
extended three-algebras, which for N=2 reproduces the Bagger-Lambert
three-algebra. Using these extended three-algebras we construct an su(N)\times
su(N) Chern-Simons action with explicit SO(8) invariance. The dynamical fields
of this theory are eight complex valued bosonic and fermionic fields in the
bi-fundamental representation of the su(N)\times su(N). For generic N the
fermionic transformations, however, close only on a subclass of the states of
this theory onto the 3d, {\cal N}=6 superalgebra. In this sector we deal with
four complex valued scalars and fermions, our theory is closely related to the
ABJM model [arXiv:0806.1218], and hence it can be viewed as the (low energy
effective) theory of N M2-branes. We discuss that our three-algebra structure
suggests a picture of open M2-brane stretched between any two pairs of
M2-branes. We also analyze the BPS configurations of our model.


title:
Directed Transmission Method, A Fully Asynchronous approach to Solve
  Sparse Linear Systems in Parallel

abstract:
  In this paper, we propose a new distributed algorithm, called Directed
Transmission Method (DTM). DTM is a fully asynchronous and continuous-time
iterative algorithm to solve SPD sparse linear system. As an architecture-aware
algorithm, DTM could be freely running on all kinds of heterogeneous parallel
computer. We proved that DTM is convergent by making use of the final-value
theorem of Laplacian Transformation. Numerical experiments show that DTM is
stable and efficient.


title:
Multiple charge spreading as a generalization of the Bertaut approach to
  lattice summation of Coulomb series in crystals

abstract:
  The Bertaut approach associated with charge spreading so as to enhance the
rate of convergence of Coulomb series in crystals is extended to the case of an
arbitrary multiple spreading with a given initial spreading function. It is
shown that the effect of spreading may in general be treated as a uniform
transformation of space, providing that zero mean potential as a universal
spatial property is sustained. As a result, electrostatic potentials driven by
different orders of multiple spreading can be obtained from the same energy
functional in a consistent manner. It is found that the effect of multiple
spreading gives rise to more advanced forms described, for example, by simple
exponential decrease, but the functional description based on a Gaussian
spreading turns out to be invariant. In addition, the effects of a multiple
charge spreading based on simple exponential and Gaussian spreading functions
are compared as typical of molecular calculations.


title: Quantum control theory for coupled 2-electron dynamics in quantum dots

abstract:
  We investigate optimal control strategies for state to state transitions in a
model of a quantum dot molecule containing two active strongly interacting
electrons. The Schrodinger equation is solved nonperturbatively in conjunction
with several quantum control strategies. This results in optimized electric
pulses in the THz regime which can populate combinations of states with very
short transition times. The speedup compared to intuitively constructed pulses
is an order of magnitude. We furthermore make use of optimized pulse control in
the simulation of an experimental preparation of the molecular quantum dot
system. It is shown that exclusive population of certain excited states leads
to a complete suppression of spin dephasing, as was indicated in Nepstad et al.
[Phys. Rev. B 77, 125315 (2008)].


title: Thermal Casimir effect with soft boundary conditions

abstract:
  We consider the thermal Casimir effect in systems of parallel plates coupled
to a mass-less free field theory via quadratic interaction terms which suppress
(i) the field on the plates (ii) the gradient of the field in the plane of the
plates. These boundary interactions correspond to (i) the presence of an
electrolyte in the plates and (ii) a uniform field of dipoles, in the plates,
which are polarizable in the plane of the plates. These boundary interactions
lead to Robin type boundary conditions in the case where there is no field
outside the two plates. In the appropriate limit, in both cases Dirichlet
boundary conditions are obtained but we show that in case (i) the Dirichlet
limit breaks down at short inter-plate distances and in (ii) it breaks down at
large distances. The behavior of the two plate system is also seen to be highly
dependent on whether the system is open or closed. In addition we analyze the
Casimir force on a third plate placed between two outer plates. The force
acting on the central plate is shown to be highly sensitive to whether or not
the fluctuating scalar field is present in the region exterior to the two
confining plates.


title: Automorphisms of doubly-even self-dual binary codes

abstract:
  The automorphism group of a binary doubly-even self-dual code is always
contained in the alternating group. On the other hand, given a permutation
group $G$ of degree $n$ there exists a doubly-even self-dual $G$-invariant code
if and only if $n$ is a multiple of 8, every simple self-dual $\F_2G$-module
occurs with even multiplicity in $\F_2^n$, and $G$ is contained in the
alternating group.


title: Entanglement in spin chains with gradients

abstract:
  We study solvable spin chains where either fields or couplings vary linearly
in space and create a sandwich-like structure of the ground state. We find that
the entanglement entropy between two halves of a chain varies logarithmically
with the interface width. After quenching to a homogeneous critical system, the
entropy grows logarithmically in time in the XX model, but quadratically in the
transverse Ising chain. We explain this behaviour and indicate generalizations
to other power laws.


title:
Bosonic Spectral Function in HTSC Cuprates: Part I - Experimental
  Evidence for Strong Electron-Phonon Interaction

abstract:
  In Part I we discuss accumulating experimental evidence related to the
structure and origin of the bosonic spectral function \alpha ^{2}F in
high-temperature superconducting (HTSC) cuprates near optimal doping. Some
global properties of \alpha ^{2}F such as number and positions of peaks, are
extracted by combining optics, neutron scattering, ARPES and tunnelling
measurements. These methods give convincing evidence for strong electron-phonon
interaction (EPI) with 1<\lambda \lesssim 3 in cuprates near optimal doping.
Here we clarify how these results are in favor of the Eliashberg-like theory
for HTSC cuprates near optimal doping.We argue that the neglect of EPI in some
previous studies of HTSC was based on a number of deceptive prejudices related
to the strength of EPI, on some physical misconceptions and misleading
interpretation of experimental results.


title:
Statics and Dynamics of Colloid-Polymer Mixtures Near Their Critical
  Point of Phase Separation: A Computer Simulation Study of a Continuous AO
  Model

abstract:
  We propose a new coarse-grained model for the description of liquid-vapor
phase separation of colloid-polymer mixtures. The hard-sphere repulsion between
colloids and between colloids and polymers, which is used in the well-known
Asakura-Oosawa (AO) model, is replaced by Weeks-Chandler-Anderson potentials.
Similarly, a soft potential of height comparable to thermal energy is used for
the polymer-polymer interaction, rather than treating polymers as ideal gas
particles. It is shown by grand-canonical Monte Carlo simulations that this
model leads to a coexistence curve that almost coincides with that of the AO
model and the Ising critical behavior of static quantities is reproduced. Then
the main advantage of the model is exploited - its suitability for Molecular
Dynamics simulations - to study the dynamics of mean square displacements of
the particles, transport coefficients such as the self-diffusion and
interdiffusion coefficients, and dynamic structure factors. While the
self-diffusion of polymers increases slightly when the critical point is
approached, the self-diffusion of colloids decreases and at criticality the
colloid self-diffusion coefficient is about a factor of 10 smaller than that of
the polymers. Critical slowing down of interdiffusion is observed, which is
qualitatively similar to symmetric binary Lennard-Jones mixtures, for which no
dynamic asymmetry of self-diffusion coefficients occurs.


title: Twisted mass QCD and the FNAL heavy quark formalism

abstract:
  At tree level, I discuss modifying the FNAL heavy quark formalism to include
a twisted mass term. I find that at maximal twist the so called KLM factor is
independent of the heavy mass.


title:
Effects of the higher partial waves and relativistic terms on the
  accuracy of the calculation of the hypertriton electroproduction

abstract:
  We have investigated the accuracies of calculations made by omitting the
higher partial waves of nuclear wave functions and the elementary relativistic
terms in the hypertriton electroproduction. We found that an accurate
calculation would still be obtained if we used at least three lowest partial
waves with isospin T = 0. Furthermore, we found that the omission of the
relativistic terms in the elementary process amplitude could lead to a large
deviation from the full calculation. We also present the cpu-times required to
calculate the cross sections. For future consideration the use of these lowest
partial waves is suggested, since the calculated cross section deviates only
about 0.17 nb/sr (approximately 4%), at most, from the full calculation,
whereas the cpu-time is reduced by a factor of 60. Comparison of our result
with the available experimental data supports these findings.


title:
The X-Ray Point-Source Population of NGC 1365: The Puzzle of Two
  Highly-Variable Ultraluminous X-ray Sources

abstract:
  We present 26 point-sources discovered with Chandra within 200" (~20kpc) of
the center of the barred supergiant galaxy NGC 1365. The majority of these
sources are high-mass X-ray binaries, containing a neutron star or a black hole
accreting from a luminous companion at a sub-Eddington rate. Using repeat
Chandra and XMM-Newton as well as optical observations, we discuss in detail
the natures of two highly-variable ultraluminous X-ray sources (ULXs): NGC 1365
X1, one of the most luminous ULXs known since the ROSAT era, which is X-ray
variable by a factor of 30, and NGC 1365 X2, a newly discovered transient ULX,
variable by a factor of >90. Their maximum X-ray luminosities (3-5 x 10^40
erg/s, measured with Chandra) and multiwavelength properties suggest the
presence of more exotic objects and accretion modes: accretion onto
intermediate mass black holes (IMBHs) and beamed/super-Eddington accretion onto
solar-mass compact remnants. We argue that these two sources have black-hole
masses higher than those of the typical primaries found in X-ray binaries in
our Galaxy (which have masses of <20 Msolar), with a likely black-hole mass of
40-60 Msolar in the case of NGC 1365 X1 with a beamed/super-Eddington accretion
mode, and a possible IMBH in the case of NGC 1365 X2 with M=80-500Msolar.


title: Rank-one isometries of proper CAT(0)-spaces

abstract:
  Let G be a non-elementary group of isometries of a proper CAT(0)-space with
limit set L. We survey properties of the action of G on L under the assumption
that G contains a rank-one element. Among others, we show that there is a dense
orbit for the action of G on the complement of the diagonal in LxL and that
pairs of fixed points of rank-one elements are dense in the complement of the
diagonal of LxL.


title: Quarks and gluons in dense two-colour QCD

abstract:
  We compute quark and gluon propagators in 2-colour QCD at large baryon
chemical potential mu. The gluon propagator is found to be antiscreened at
intermediate mu and screened at large mu. The quark propagator is drastically
modified in the superfluid region as a result of the formation of a superfluid
gap.


title:
Applications of the operator $H(\alpha,\beta)$ to the Humbert double
  hypergeometric functions

abstract:
  By making use of some techniques based upon certain inverse new pairs of
symbolic operators, the author investigate several decomposition formulas
associated with Humbert hypergeometric functions $\Phi_1 $, $\Phi_2 $, $\Phi_3
$, $\Psi_1 $, $\Psi_2 $, $\Xi_1 $ and $\Xi_2 $. These operational
representations are constructed and applied in order to derive the
corresponding decomposition formulas. With the help of these inverse pairs of
symbolic operators, a total 34 decomposition formulas are found. Euler type
integrals, which are connected with Humbert's functions are found.


title: Effective theory for the Goldstone field in the BCS-BEC crossover at T=0

abstract:
  We perform a detailed study of the effective Lagrangian for the Goldstone
mode of a superfluid Fermi gas at zero temperature in the whole BCS-BEC
crossover. By using a derivative expansion of the response functions, we derive
the most general form of this Lagrangian at the next to leading order in the
momentum expansion in terms of four coefficient functions. This involves the
elimination of all the higher order time derivatives by careful use of the
leading order field equations. In the infinite scattering length limit where
conformal invariance is realized, we show that the effective Lagrangian must
contain an unnoticed invariant combination of higher spatial gradients of the
Goldstone mode, while explicit couplings to spatial gradients of the trapping
potential are absent. Across the whole crossover, we determine all the
coefficient functions at the one-loop level, taking into account the dependence
of the gap parameter on the chemical potential in the mean-field approximation.
These results are analytically expressed in terms of elliptic integrals of the
first and second kind. We discuss the form of these coefficients in the extreme
BCS and BEC regimes and around the unitary limit, and compare with recent work
by other authors.

categories: cond-mat.other cond-mat.supr-con hep-th nucl-th


title: Abundance Stratification of Exoplanet Host Stars

abstract: This paper has been withdrawn due to a copyright restrictions.


title:
Bifurcations in a convection problem with temperature-dependent
  viscosity

abstract:
  A convection problem with temperature-dependent viscosity in an infinite
layer is presented. As described, this problem has important applications in
mantle convection. The existence of a stationary bifurcation is proved together
with a condition to obtain the critical parameters at which the bifurcation
takes place. For a general dependence of viscosity with temperature a numerical
strategy for the calculation of the critical bifurcation curves and the most
unstable modes has been developed. For a exponential dependence of viscosity on
temperature the numerical calculations have been done. Comparisons with the
classical Rayleigh-B\'enard problem with constant viscosity indicate that the
critical threshold decreases as the exponential rate parameter increases.


title:
Dynamical evolution of rotating dense stellar systems with embedded
  black holes

abstract:
  Evolution of self-gravitating rotating dense stellar systems (e.g. globular
clusters, galactic nuclei) with embedded black holes is investigated. The
interaction between the black hole and stellar component in differential
rotating flattened systems is followed. The interplay between velocity
diffusion due to relaxation and black hole star accretion is investigated
together with cluster rotation using 2D+1 Fokker-Planck numerical methods. The
models can reproduce the Bahcall-Wolf solution $f \propto E^{1/4}$ ($n \propto
r^{-7/4}$) inside the zone of influence of the black hole. Gravo-gyro and
gravothermal instabilities conduce the system to a faster evolution leading to
shorter collapse times with respect to the non-rotating systems. Angular
momentum transport and star accretion support the development of central
rotation in relaxation time scales. We explore system dissolution due to
mass-loss in the presence of an external tidal field (e.g. globular clusters in
galaxies).


title: Solid-liquid coexistence of polydisperse fluids via simulation

abstract:
  We describe a simulation method for the accurate study of the equilibrium
freezing properties of polydisperse fluids under the experimentally relevant
condition of fixed polydispersity. The approach is based on the phase switch
Monte Carlo method of Wilding and Bruce [Phys. Rev. Lett. {\bf 85}, 5138
(2000)]. This we have generalized to deal with particle size polydispersity by
incorporating updates which alter the diameter $\sigma$ of a particle, under
the control of a distribution of chemical potential differences
$\tilde\mu(\sigma)$. Within the resulting isobaric semi-grand canonical
ensemble, we detail how to adapt $\tilde\mu(\sigma)$ and the applied pressure
such as to study coexistence, whilst ensuring that the ensemble averaged
density distribution $\rho(\sigma)$ matches a fixed functional form. Results
are presented for the effects of small degrees of polydispersity on the
solid-liquid transition of soft spheres.


title: Mesoscopic oscillator in U-shape with giant persistent current

abstract:
  A mesoscopic oscillator in U-shape has been proposed and studied. Making use
of a magnetic flux together with a potential of confinement, the electron
contained in the oscillator has been localized initially and an amount of
energy has been thereby stored. Then a sudden cancellation of both the
potential and the flux may cause an initial current which initiates a periodic
motion of the electron from one end of the U-oscillator to the opposite end,
and repeatedly. The period is adjustable. The current associated with the
periodic motion can be tuned very strong (say, more than two orders larger than
the current of the usual Aharonov-Bohm oscillation). Related theory and
numerical results are presented.


title:
Quark mass dependence of thermal excitations in QCD in one-loop
  approximation

abstract:
  A comprehensive determination of the quark mass dependence in the dispersion
relations of thermal excitations of gluons and quarks in non-Abelian gauge
theory (QCD) is presented for the one-loop approximation in Feynman gauge.
Larger values of the coupling are admitted, and the gauge dependence is
discussed. In a Dyson-Schwinger type approach, the effect of higher orders is
estimated for asymptotic thermal masses.


title:
Chandra astrometry sets a tight upper limit to the proper motion of SGR
  1900+14

abstract:
  The soft gamma-ray repeater (SGR) SGR 1900+14 lies a few arcminutes outside
the edge of the shell supernova remnant (SNR) G42.8+0.6. A physical association
between the two systems has been proposed - for this and other SGR-SNR pairs -
based on the expectation of high space velocities for SGRs in the framework of
the magnetar model. The large angular separation between the SGR and the SNR
center, coupled with the young age of the system, suggest a test of the
association with a proper motion measurement. We used a set of three
Chandra/ACIS observations of the field spanning 5 years to perform accurate
relative astrometry in order to measure the possible angular displacement of
the SGR as a function of time. Our investigation sets a 3-sigma upper limit of
70 mas/yr to the overall proper motion of the SGR. Such a value argues against
an association of SGR 1900+14 with G42.8+0.6 and adds further support to the
mounting evidence for an origin of the SGR within a nearby, compact cluster of
massive stars.


title:
A model-independent test for scale-dependent non-Gaussianities in the
  CMB

abstract:
  We present a model-independent method to test for scale-dependent
non-Gaussianities in combination with scaling indices as test statistics.
Therefore, surrogate data sets are generated, in which the power spectrum of
the original data is preserved, while the higher order correlations are partly
randomised by applying a scale-dependent shuffling procedure to the Fourier
phases. We apply this method to the WMAP data of the cosmic microwave
background (CMB) and find signatures for non-Gaussianities on large scales.
Further tests are required to elucidate the origin of the detected anomalies.


title:
Using dynamically scattered electrons for 3-dimensional potential
  reconstruction

abstract:
  Three-dimensional charge density maps computed by first-principles methods
provide information about atom positions and the bonds between them, data which
is particularly valuable when trying to understand the properties of point
defects, dislocations, and interfaces. This letter presents a method by which
3-dimensional maps of the electrostatic potential, related to the charge
density map by the Poisson equation, can be obtained experimentally at 0.1 nm
resolution or better. This method requires data acquired by holographic
transmission electron microscopy (TEM) methods such as off-axis electron
holography or focal series reconstruction for different directions of the
incident electron beam. The reconstruction of the 3-dimensional electrostatic
(and absorptive) potential is achieved by making use of changes in the
dynamical scattering within the sample as the direction of the incident beam
varies.


title: Status of ETMC simulations with Nf=2+1+1 twisted mass fermions

abstract:
  We present the status of runs performed in the twisted mass formalism with
$N_{\rm f}=2+1+1$ flavours of dynamical fermions: a degenerate light doublet
and a mass split heavy doublet. The procedure for tuning to maximal twist will
be described as well as the current status of the runs using both thin and
stout links. Preliminary results for a few observables obtained on ensembles at
maximal twist will be given. Finally, a reweighting procedure to tune to
maximal twist will be described.


title: Present state and promises of the RAVE survey

abstract:
  The RAdial Velocity Experiment (RAVE) is an ambitious survey to measure the
radial velocities, temperatures, surface gravities, metallicities and abundance
ratios for up to a million stars using the 1.2-m UK Schmidt Telescope of the
Anglo-Australian Observatory (AAO), over the period 2003 - 2011. The survey
represents a big advance in our understanding of our own Milky Way galaxy. The
main data product will be a southern hemisphere survey of about a million
stars. Their selection is based exclusively on their I--band colour, so
avoiding any colour-induced bias. RAVE is expected to be the largest
spectroscopic survey of the Solar neighbourhood in the coming decade, but with
a significant fraction of giant stars reaching out to 10 kpc from the Sun. RAVE
offers the first truly representative inventory of stellar radial velocities
for all major components of the Galaxy. Here we present the first scientific
results of this survey as well as its second data release which doubles the
number of previously released radial velocities. For the first time, the
release also provides atmospheric parameters for a large fraction of the second
year data, making it an unprecedented tool to study the formation of the Milky
Way. Plans for further data releases are outlined.


title: Charged anisotropic matter with linear equation of state

abstract:
  We consider the general situation of a compact relativistic body with
anisotropic pressures in the presence of the electromagnetic field. The
equation of state for the matter distribution is linear and may be applied to
strange stars with quark matter. Three classes of new exact solutions are found
to the Einstein-Maxwell system. This is achieved by specifying a particular
form for one of the gravitational potentials and the electric field intensity.
We can regain anisotropic and isotropic models from our general class of
solution. A physical analysis indicates that the charged solutions describe
realistic compact spheres with anisotropic matter distribution. The equation of
state is consistent with dark energy stars and charged quark matter
distributions. The masses and central densities correspond to realistic stellar
objects in the general case when anisotropy and charge are present.


title:
Lifespan of Classical Solutions to Quasi-linearHyperbolic Systems with
  Small BV Normal Initial Data

abstract:
  In this paper, we first give a lower bound of the lifespan and some estimates
of classical solutions to the Cauchy problem for general quasi-linear
hyperbolic systems, whose characteristic fields are not weakly linearly
degenerate and the inhomogeneous terms satisfy Kong's matching condition. After
that, we investigate the lifespan of the classical solution to the Cauchy
problem and give a sharp limit formula. In this paper, we only require that the
initial data are sufficiently small in the $L^1$ sense and the BV sense.


title: Many-Beam Solution to the Phase Problem in Crystallography

abstract:
  Solving crystal structures from electron diffraction patterns rather than
X-ray diffraction data is hampered by multiple scattering of the fast electrons
within even very thin samples and the difficulty of obtaining diffraction data
at a resolution high enough for applying direct phasing methods. This letter
presents a method by which the effect of multiple scattering is being used for
solving the phase problem, allowing the retrieval of electron structure factors
from diffraction patterns recorded with varying angle of incidence without any
assumption about the scattering potential itself. In particular, the resolution
in the diffraction data does not need to be sufficient to resolve atoms, making
this method particularly interesting for electron crystallography of
2-dimensional protein crystals and other beam-sensitive complex structures.


title: Anderson localization in a correlated fermionic mixture

abstract:
  A mixture of two fermionic species with different masses is studied in an
optical lattice. The heavy fermions are subject only to thermal fluctuations,
the light fermions also to quantum fluctuations. We derive the Ising-like
distribution for the heavy atoms and study the localization properties of the
light fermions numerically by a transfer-matrix method. In a two-dimensional
system one-parameter scaling of the localization length is found with a
transition from delocalized states at low temperatures to localized states at
high temperature. The critical exponent of the localization length is
$\nu\approx 0.88$.


title:
Ionization and expansion dynamics of atomic clusters irradiated with
  short intense VUV pulses

abstract:
  Kinetic Boltzmann equations are used to model the ionization and expansion
dynamics of xenon clusters irradiated with short intense VUV pulses. This
unified model includes predominant interactions that contribute to the cluster
dynamics induced by this radiation. The dependence of the evolution dynamics on
cluster size, $N_{atoms}=20-90000$, and pulse fluence, $F=0.05-1.5$ J/cm$^2$,
corresponding to intensities in the range, $10^{12}-10^{14}$ W/cm$^2$ and
irradiation times, $\leq 50$ fs, is investigated. The predictions obtained with
our model are found to be in good agreement with the experimental data. We find
that during the exposure the cluster forms a shell structure consisting of a
positively charged outer shell and a core of net charge equal to zero. The
width of these shells depends on the cluster size. The charged outer shell is
large within small clusters ($N_{atoms}=20,70$), and its Coulomb explosion
drives the expansion of these clusters. Within the large clusters
($N_{atoms}=2500,90000$) the neutral core is large, and after the Coulomb
explosion of the outer shell it expands hydrodynamically. Highly charged ions
within the core recombine efficiently with electrons. As a result, we observe a
large fraction of neutral atoms created within the core, its magnitude
depending on the cluster size.


title: Incoherent Control of Locally Controllable Quantum Systems

abstract:
  An incoherent control scheme for state control of locally controllable
quantum systems is proposed. This scheme includes three steps: (1) amplitude
amplification of the initial state by a suitable unitary transformation, (2)
projective measurement on the amplified state, and (3) final optimization by a
unitary controlled transformation. The first step increases the amplitudes of
some desired eigenstates and the corresponding probability of observing these
eigenstates, the second step projects, with high probability, the amplified
state into a desired eigenstate, and the last step steers this eigenstate into
the target state. Within this scheme, two control algorithms are presented for
two classes of quantum systems. As an example, the incoherent control scheme is
applied to the control of a hydrogen atom by an external field. The results
support the suggestion that projective measurements can serve as an effective
control and local controllability information can be used to design control
laws for quantum systems. Thus, this scheme establishes a subtle connection
between control design and controllability analysis of quantum systems and
provides an effective engineering approach for controlling quantum systems with
partial controllability information.


title: BFKL Pomeron and Bern-Dixon-Smirnov amplitudes in N=4 SUSY

abstract:
  We review the theoretical approaches for investigations of the high energy
hadron-hadron scattering in the Regge kinematics. It is demonstrated, that the
gluon in QCD is reggeized and the Pomeron is a composite state of the reggeized
gluons. Remarkable properties of the BFKL equation for the Pomeron wave
function in QCD and supersymmetric gauge theories are outlined. Due to the
AdS/CFT correspondence the BFKL Pomeron is equivalent to the reggeized graviton
in the extended N=4 SUSY. The properties of the maximal transcendentality and
integrability are realized in this model. The BDS multi-gluon scattering
amplitudes are investigated in the Regge limit. They do not contain the
Mandelstam cuts and are not valid beyond one loop. It is shown, that the
hamiltonian for these composite states coincides with the hamiltonian of an
integrable open Heisenberg spin chain.


title: Symplectic geometry of semisimple orbits

abstract:
  We prove that any coadjoint orbit with real eigenvalues of a complex
semisimple Lie group, equipped with the real part of the canonical holomorphic
symplectic form, is symplectomorphic to the cotangent bundle of a (partial)
flag manifold. Moreover, we generalize this result to hyperbolic orbits in a
real semisimple Lie algebra.


title:
Hard Pomeron-Odderon interference effects in the production of pi^+pi^-
  pairs in high energy gamma-gamma collisions at the LHC

abstract:
  We estimate the production of two meson pairs in high energy photon photon
collisions produced in ultraperipheral collisions at LHC. We show that the
study of charge asymmetries may reveal the existence of the perturbative
Odderon and discuss the concrete event rates expected at the LHC. Sizable rates
and asymmetries are expected in the case of proton-proton collisions and medium
values of gamma-gamma energies \sqrt{s_{\gamma \gamma}} \approx 20GeV.
Proton-proton collisions will benefit from a high rate due to a large effective
gamma-gamma luminosity and ion-ion collisions with a somewhat lower rate from
the possibility to trigger on ultraperipheral collisions and a reduced
background from strong interactions.


title: Mathematical models of intergroup conflicts

abstract:
  The human society today is far from perfection and conflicts between groups
of humans are frequent events. One example for such conflicts are armed
intergroup conflicts. The collective behavior of the large number of
cooperating participants in these conflicts allows us to describe the conflict
on the basis of models containing only few variables. In this paper we discuss
several cases of conflicts without use of weapons of non-conventional kind. In
the ancient times the Chinese writer Sun Tsu mentioned that the war is an art.
We can confirm that the conflict is an art but with much mathematics at the
background.


title:
Dual fermion approach to the two-dimensional Hubbard model:
  Antiferromagnetic fluctuations and Fermi arcs

abstract:
  We present an efficient diagrammatic method to describe nonlocal correlation
effects in lattice fermion Hubbard-like models, which is based on a change of
variables in the Grassmann path integrals. The new fermions are dual to the
original ones and correspond to weakly interacting quasiparticles in the case
of strong local correlations in the Hubbard model. The method starts with
dynamical mean-field theory as a zeroth-order approximation and includes
non-local effects in a perturbative way. In contrast to cluster approaches,
this method utilizes an exact transition to a dual set of variables. It
therefore becomes possible to treat the irreducible vertices of an effective
{\it single-impurity} problem as small parameters. This provides a very
efficient interpolation between band-like weak-coupling and atomic limits. The
method is illustrated on the two-dimensional Hubbard model. The
antiferromagnetic pseudogap, Fermi-arc formations, and non-Fermi-liquid effects
due to the van Hove singularity are correctly reproduced by the lowest-order
diagrams. Extremum properties of the dual fermion approach are discussed in
terms of the Feynman variational principle.


title:
Temperature and Metallicity in the Intra-cluster Medium of ABELL 262
  observed with Suzaku

abstract:
  We studied the temperature and abundance distributions of intra-cluster
medium (ICM) in the Abell 262 cluster of galaxies observed with Suzaku. Abell
262 is a bright, nearby poor cluster with ICM temperature of ~2 keV, thus
providing useful information about the connection of ICM properties between
groups and clusters of galaxies. The observed spectrum of the central region
was well-represented by two temperature models, and the spectra for the outer
regions were described by single temperature model. With the XIS instrument, we
directly measured not only Si, S, and Fe lines but also O and Mg lines and
obtained those abundances to an outer region of ~0.43 r_180 for the first time.
We found steep gradients for Mg, Si, S, and Fe abundances, while O showed
almost flat abundance distribution. Abundance ratios of alpha-elements to Fe
were found to be similar to those of the other clusters and groups. We
calculated the number ratio of type II to type Ia supernovae for the ICM
enrichment to be 3.0 +- 0.6 within 0.1 r_180, and the value was consistent with
those for other clusters and groups. We also calculated metal mass-to-light
ratios (MLRs) for Fe, O and Mg (IMLR, OMLR, MMLR) with B-band and K-band
luminosities of the member galaxies of Abell 262. The derived MLRs were
comparable to those for other clusters with kT = 3-4 keV.


title: Probing Non Standard Neutrino Physics at T2KK and Neutrino Factory

abstract:
  We discuss the possibility of constraining or discovering the non-standard
neutrino physics beyond the standard model with future long baseline neutrino
oscillation experiments. Among very many possible experimental set up we
discuss neutrino factory and T2KK, in which two detector setting may be useful
to achieve the goal. In particular, neutrino factory with two detectors at
baselines of 3000 km and 7000 km have a great sensitivity to non-standard
interaction (NSI) and solve the $\theta_{13}$-NSI confusion problem.


title: Electron bunch injection at an angle into a laser wakefield

abstract:
  External injection of electron bunches longer than the plasma wavelength in a
laser wakefield accelerator can lead to the generation of femtosecond
ultrarelativistic bunches with a couple of percent energy spread. Extensive
study has been done on external electron bunch (e.g. one generated by a
photo-cathode rf linac) injection in a laser wakefield for different
configurations. In this paper we investigate a new way of external injection
where the electron bunch is injected at a small angle into the wakefield. This
way one can avoid the ponderomotive scattering as well as the vacuum-plasma
transition region, which tend to destroy the injected bunch. In our
simulations, the effect of the laser pulse dynamics is also taken into account.
It is shown that injection at an angle can provide compressed and accelerated
electron bunches with less than 2% energy spread. Another advantage of this
scheme is that it has less stringent requirements in terms of the size of the
injected bunch and there is the potential to trap more charge.


title:
Stability estimates for resolvents, eigenvalues and eigenfunctions of
  elliptic operators on variable domains

abstract:
  We consider general second order uniformly elliptic operators subject to
homogeneous boundary conditions on open sets $\phi (\Omega)$ parametrized by
Lipschitz homeomorphisms $\phi $ defined on a fixed reference domain $\Omega$.
Given two open sets $\phi (\Omega)$, $\tilde \phi (\Omega)$ we estimate the
variation of resolvents, eigenvalues and eigenfunctions via the Sobolev norm
$\|\tilde \phi -\phi \|_{W^{1,p}(\Omega)}$ for finite values of $p$, under
natural summability conditions on eigenfunctions and their gradients. We prove
that such conditions are satisfied for a wide class of operators and open sets,
including open sets with Lipschitz continuous boundaries. We apply these
estimates to control the variation of the eigenvalues and eigenfunctions via
the measure of the symmetric difference of the open sets. We also discuss an
application to the stability of solutions to the Poisson problem.


title:
Dynamics of the one-dimensional random transverse Ising model with
  next-nearest-neighbor interactions

abstract:
  The dynamics of the one-dimensional random transverse Ising model with both
nearest-neighbor (NN) and next-nearest-neighbor (NNN) interactions is studied
in the high-temperature limit by the method of recurrence relations. Both the
time-dependent transverse correlation function and the corresponding spectral
density are calculated for two typical disordered states. We find that for the
bimodal disorder the dynamics of the system undergoes a crossover from a
collective-mode behavior to a central-peak one and for the Gaussian disorder
the dynamics is complex. For both cases, it is found that the central-peak
behavior becomes more obvious and the collective-mode behavior becomes weaker
as $K_{i}$ increase, especially when $K_{i}>J_{i}/2$ ($J_{i}$ and $K_{i}$ are
exchange couplings of the NN and NNN interactions, respectively). However, the
effects are small when the NNN interactions are weak ($K_{i}<J_{i}/2$).


title: Membranes, Strings and Integrability

abstract:
  In the first half of this note, after briefly motivating and reviewing
membrane field theories, we consider their BPS funnel solutions. We discuss
some aspects of embedding M-theory fuzzy funnels in these theories. In the
second half, we focus on ABJM theory and explain a test of AdS4/CFT3 based on
integrability. We discuss a numerical mismatch at one loop in worldsheet
perturbation theory and its possible resolutions.


title: Stage analysis of delayed-choice and quantum eraser experiments

abstract:
  Delayed choice and quantum eraser experiments have attracted much interest
recently, both theoretically and experimentally. In particular, they have
prompted suggestions that quantum mechanics involves acausal effects. Using a
recently developed approach which takes apparatus into account, we present a
detailed analysis of various double-slit experiments to show that this is never
the case. Instead, quantum experiments can be described in terms of a novel
concept of time called stages. These can cut across the conventional linear
time parameter as experienced in the laboratory and appear to violate
causality.


title:
Comments on the Boundary of the Capacity Region of Multiaccess Fading
  Channels

abstract:
  A modification is proposed for the formula known from the literature that
characterizes the boundary of the capacity region of Gaussian multiaccess
fading channels. The modified version takes into account potentially negative
arguments of the cumulated density function that would affect the accuracy of
the numerical capacity results.


title: Quantum reinforcement learning

abstract:
  The key approaches for machine learning, especially learning in unknown
probabilistic environments are new representations and computation mechanisms.
In this paper, a novel quantum reinforcement learning (QRL) method is proposed
by combining quantum theory and reinforcement learning (RL). Inspired by the
state superposition principle and quantum parallelism, a framework of value
updating algorithm is introduced. The state (action) in traditional RL is
identified as the eigen state (eigen action) in QRL. The state (action) set can
be represented with a quantum superposition state and the eigen state (eigen
action) can be obtained by randomly observing the simulated quantum state
according to the collapse postulate of quantum measurement. The probability of
the eigen action is determined by the probability amplitude, which is
parallelly updated according to rewards. Some related characteristics of QRL
such as convergence, optimality and balancing between exploration and
exploitation are also analyzed, which shows that this approach makes a good
tradeoff between exploration and exploitation using the probability amplitude
and can speed up learning through the quantum parallelism. To evaluate the
performance and practicability of QRL, several simulated experiments are given
and the results demonstrate the effectiveness and superiority of QRL algorithm
for some complex problems. The present work is also an effective exploration on
the application of quantum computation to artificial intelligence.


title:
Observation of an enhancement in $e^+e^- \to \Upsilon(1S)\pi^+ \pi^-$,
  $\Upsilon(2S)\pi^+ \pi^-$, and $\Upsilon(3S)\pi^+ \pi^-$ production around
  $\sqrt{s}=10.89$ GeV at Belle

abstract:
  We measure the production cross sections for $e^+e^- \to
\Upsilon(1S)\pi^+\pi^-$, $\Upsilon(2S)\pi^+\pi^-$, and $\Upsilon(3S)\pi^+\pi^-$
as a function of $\sqrt{s}$ between 10.83 GeV and 11.02 GeV. The data consists
of 8.1 fb$^{-1}$ collected with the Belle detector at the KEKB $e^+e^-$
collider. We observe enhanced production in all three final states that does
not conform well with the conventional $\Upsilon(10860)$ lineshape. A fit using
a Breit-Wigner resonance shape yields a peak mass of $[10888.4^{+2.7}_{-2.6}
({\rm stat}) \pm1.2 ({\rm syst})]$ MeV/$c^2$ and a width of
$[30.7_{-7.0}^{+8.3} ({\rm stat}) \pm3.1 ({\rm syst})]$ MeV/$c^2$.


title:
Capability of the PAMELA Time-Of-Flight to identify light nuclei:
  results from a beam test calibration

abstract:
  PAMELA is a space telescope orbiting around the Earth since June 2006. The
scientific objectives addressed by the mission are the measurement of the
antiprotons and positrons spectra in cosmic rays, the hunt for anti-nuclei as
well as the determination of light nuclei fluxes from Hydrogen to Oxygen in a
wide energy range and with very high statistics. In this paper the charge
discrimination capabilities of the PAMELA Time-Of-Flight system for light
nuclei, determined during a beam test calibration, will be presented.


title: Antimatter and Dark Matter search in space with AMS-02

abstract:
  AMS-02 is a space-borne magnetic spectrometer designed to measure with very
high accuracy the composition of Cosmic Rays near Earth. With a large
acceptance of 5000 squared centimeters, an intense magnetic field from a
superconducting magnet (0.7 T) and a very efficient particle identification,
AMS-02 will provide the highest precision in Cosmic Rays measurements up to the
TeV region. During a three-years mission on board of the International Space
Station, AMS-02 will achieve a sensitivity to the existence of anti-Helium
nuclei in the Cosmic Rays of one part in a billion, as well as provide
important information on the origin and nature of the Dark Matter.


title:
Addendum to "Experimental demonstration of a quantum protocol for
  Byzantine agreement and liar detection" arXiv:0710.0290

abstract:
  Gao et al. [Phys. Rev. Lett. 101, 208901 (2008)] have described a possible
intercept-resend attack for the quantum protocol for detectable Byzantine
agreement in Phys. Rev. Lett. 100, 070504 (2008). Here we describe an extension
of the protocol which defeats such attacks.


title:
Unusual states of vortex matter in mixtures of Bose--Einstein
  Condensates on rotating optical lattices

abstract:
  A striking property of a single-component superfluid under rotation, is that
a broken symmetry in the order parameter results in a broken translational
symmetry, a vortex lattice. If translational symmetry is restored, the phase of
the order parameter disorders and the broken symmetry in the order parameter is
restored. We show that for Bose-Condensate mixtures on optical lattices (which
may possess a negative dissipationless intercomponent drag), a new situation
arises. A phase disordered nonsuperfluid component can break translational
symmetry in response to rotation due to interaction with a superfluid
component. This state is a modulated vortex liquid which breaks translational
symmetry in the direction transverse to the rotation vector.


title: Scar-Driven Shape-Changes of Virus Capsids

abstract:
  We propose that certain patterns (scars) -- theoretically and numerically
predicted to be formed by electrons arranged on a sphere to minimize the
repulsive Coulomb potential (the Thomson problem) and experimentally found in
spherical crystals formed by self-assembled polystyrene beads (an instance of
the {\it generalized} Thomson problem) -- could be relevant to extend the
classic Caspar and Klug construction for icosahedrally-shaped virus capsids.
The main idea is that scars could be produced on the capsid at an intermediate
stage of its evolution and the release of the bending energy present in scars
into stretching energy could allow for shape-changes. The conjecture can be
tested in experiments and/or in numerical simulations.


title: The structure of the nucleon from generalized parton distributions

abstract:
  Generalized parton distributions (GPDs) have become a standard QCD tool for
analyzing and parametrizing the non perturbative parton structure of hadron
targets. GPDs might be viewed as non-diagonal overlaps of light-cone wave
functions and offer the opportunity to study the partonic content of the
nucleon from a new perspective, allowing one to study the interplay between
longitudinal and transverse partonic degrees of freedom. In particular, we will
review some of the new information encoded in the GPDs through the definition
of impact-parameter dependent parton distributions and form factors of the
energy-momentum tensor, by exploiting different dynamical models for the
nucleon state.


title: Best-effort Group Service in Dynamic Networks

abstract:
  We propose a group membership service for dynamic ad hoc networks. It
maintains as long as possible the existing groups and ensures that each group
diameter is always smaller than a constant, fixed according to the application
using the groups. The proposed protocol is self-stabilizing and works in
dynamic distributed systems. Moreover, it ensures a kind of continuity in the
service offer to the application while the system is converging, except if too
strong topology changes happen. Such a best effort behavior allows applications
to rely on the groups while the stabilization has not been reached, which is
very useful in dynamic ad hoc networks.


title:
Spin-Peierls instabilities of antiferromagnetic rings in a magnetic
  field

abstract:
  Motivated by the intriguing properties of magnetic molecular wheels at field
induced level crossings, we investigate the spin-Peierls instability of
antiferromagnetic rings in a field by exact diagonalizations of a microscopic
spin model coupled to the lattice via a distortion dependent
Dzyaloshinskii-Moriya interaction. We show that, beyond the unconditional
instability at level crossings for infinitesimal magnetoelastic coupling, the
model is characterized by a stronger tendency to distort at higher level
crossings, and by a dramatic angular dependence with very sharp torque
anomalies when the field is almost in the plane of the ring. These predictions
are shown to compare remarkably well with available torque and Nuclear Magnetic
Resonance data on CsFe8.


title:
Comparaison des param\`etres de Langlands et des exposants \`a
  l'int\'erieur d'un paquet d'Arthur

abstract:
  In this paper, one proves an idea expressed by Clozel: inside an Arthur's
packet, one has the representations in the Langlands' packet inside the
Arthur's packet and more tempered representations than these representations


title: Asteroseismology of Red Giant stars

abstract:
  Sun-like oscillations, that is p-modes excited stochastically by convective
noise, have now been observed in a number of Red Giant stars. Compared to those
seen in the Sun, these modes are of large amplitude and long period, making the
oscillations attractive prospects for observation. However, the low Q-factor of
these modes, and issues relating to the rising background at low frequencies,
present some interesting challenges for identifying modes and determining the
related asteroseismic parameters.
  We report on the analysis procedure adopted for peak-bagging by our group at
Birmingham, and the techniques used to robustly ensure these are not a product
of noise. I also show results from a number of giants extracted from multi-year
observations with the SMEI instrument.


title:
Reversible A <-> B reaction - diffusion process with initially mixed
  reactants: boundary layer function approach

abstract:
  The reversible A <-> B reaction-diffusion process, when species A and B are
initially mixed and diffuse with different diffusion coefficients, is
investigated using the boundary layer function method. It is assumed that the
ratio of the characteristic time of the reaction to the characteristic time of
diffusion is taken as a small parameter of the task. It was shown that
diffusion-reaction process can be considered as a quasi-equilibrium process.
Despite this fact the contribution of the reaction in changes of the species
concentration is comparable with the diffusion contributions. Moreover the
ratios of the reaction and diffusion contributions are independent of time and
coordinate. The dependence of the reaction rate on the initial species
distribution is analyzed. It was firstly obtained that the number of the
reaction zones is determined by the initial conditions and changes with time.
The asymptotic long-time behaviour of the reaction rate also dependents on the
initial distribution.


title: Quantum micro-mechanics with ultracold atoms

abstract:
  In many experiments isolated atoms and ions have been inserted into
high-finesse optical resonators for the study of fundamental quantum optics and
quantum information. Here, we introduce another application of such a system,
as the realization of cavity optomechanics where the collective motion of an
atomic ensemble serves the role of a moveable optical element in an optical
resonator. Compared with other optomechanical systems, such as those
incorporating nanofabricated cantilevers or the large cavity mirrors of
gravitational observatories, our cold-atom realization offers direct access to
the quantum regime. We describe experimental investigations of optomechanical
effects, such as the bistability of collective atomic motion and the first
quantification of measurement backaction for a macroscopic object, and discuss
future directions for this nascent field.


title:
Renormalization of the antisymmetric tensor field propagator and
  dynamical generation of the $1^{+-}$ mesons in Resonance Chiral Theory

abstract:
  We discuss the renormalization of the $1^{--}$ vector meson propagator within
Resonance chiral theory at one loop. Using the particular form of the
interaction Lagrangian we show that additional poles of the renormalized
propagator corresponding to $1^{+-}$ degrees of freedom can be generated. We
give a concrete example of such an effect.


title: Approximating Fractional Time Quantum Evolution

abstract:
  An algorithm is presented for approximating arbitrary powers of a black box
unitary operation, $\mathcal{U}^t$, where $t$ is a real number, and
$\mathcal{U}$ is a black box implementing an unknown unitary. The complexity of
this algorithm is calculated in terms of the number of calls to the black box,
the errors in the approximation, and a certain `gap' parameter. For general
$\mathcal{U}$ and large $t$, one should apply $\mathcal{U}$ a total of $\lfloor
t \rfloor$ times followed by our procedure for approximating the fractional
power $\mathcal{U}^{t-\lfloor t \rfloor}$. An example is also given where for
large integers $t$ this method is more efficient than direct application of $t$
copies of $\mathcal{U}$. Further applications and related algorithms are also
discussed.


title: Alexey Vasilyevich Pogorelov, the mathematician of an incredible power

abstract: Life and the mathematical legacy of the great mathematician A.V. Pogorelov.


title: Leaf-wise intersections and Rabinowitz Floer homology

abstract:
  In this article we explain how critical points of a particular perturbation
of the Rabinowitz action functional give rise to leaf-wise intersection points
in hypersurfaces of restricted contact type. This is used to derive existence
and multiplicity results for leaf-wise intersection points in hypersurfaces of
restricted contact type in general exact symplectic manifolds. The notion of
leaf-wise intersection points was introduced by Moser.


title: An enigmatic HI cloud

abstract:
  The discovery of an HI cloud with peculiar properties at equatorial
coordinates (J2000) ra=07h49m, dec=04d30m is presented. The HI object was
detected at 21cm using the 300-m NAIC Arecibo telescope. Subsequent follow-up
high-resolution observations with the NRAO Very Large Array (VLA) telescope at
L-Band revealed more details about its morphology. The most intriguing aspect
of the object is the clear velocity gradient of 1 km/s, which is present in the
data, an indication of either rotation or expansion. The gas appears to be
cold, and its morphology is somewhat elliptical with clumpy substructure.
Assuming disk rotation, the dynamical mass could be determined as a function of
distance.Depending on the exact nature of the velocity gradient in the HI
cloud, we can reach some preliminary conclusions about the nature of the
object. Expansion would imply association with a circumstellar envelope of an
evolved AGB star, while in the case of rotation, a comparison between the
visible and the dynamical mass can lead to some preliminary conclusions. A
common feature of those conclusions is the presence of a gravitational
potential well, which is required to account for the rotation of the trapped HI
gas. This potential well could be associated with a dark galaxy or some other
exotic object.


title:
Supercurrent and multiple singlet-doublet phase transitions of a quantum
  dot Josephson junction inside an Aharonov-Bohm ring

abstract:
  We study a quantum dot Josephson junction inside an Aharonov-Bohm
environment. The geometry is modeled by an Anderson impurity coupled to two
directly-linked BCS leads. We illustrate that the well-established picture of
the low-energy physics being governed by an interplay of two distinct (singlet
and doublet) phases is still valid for this interferometric setup. The phase
boundary depends, however, non-monotonically on the coupling strength between
the superconductors, causing the system to exhibit re-entrance behavior and
multiple phase transitions. We compute the zero-temperature Josephson current
and demonstrate that it can become negative in the singlet phase by virtue of
the Coulomb interaction U. As a starting point, the limit of large
superconducting energy gaps \Delta=\infty is solved analytically. In order to
tackle arbitrary \Delta<\infty and U>0, we employ a truncated functional
renormalization group scheme which was previously demonstrated to give
quantitatively reliable results for the quantum dot Josephson problem.


title:
Ejection of hypervelocity binary stars by a black hole of intermediate
  mass orbiting Sgr A*

abstract:
  The discovery of hypervelocity binary stars (HVBs) in the Galactic halo would
provide definite evidence of the existence of a massive black hole companion to
Sgr A*. Here we use an hybrid approach to compute the rate of ejection and the
total number of HVBs produced by a hypothetical intermediate-mass black hole
(IMBH, M_2<10^5\msun) orbiting Sgr A*. Depending on the mass of M_2 and on the
properties of binary stars in the central parsec of the Milky Way, we show that
the number of undisrupted HVBs expected to be expelled from the Galactic Center
before binary black hole coalescence ranges from zero to a few dozens at most.
Therefore, the non-detection of stellar binaries in a complete survey of
hypervelocity stars would not rule out the occurrence of an IMBH-Sgr A*
in-spiralling event within the last few 10^8 years.


title: Duality between Wilson Loops and Scattering Amplitudes

abstract:
  We summarise the status of an intriguing new duality between planar maximally
helicity violating scattering amplitudes and light-like Wilson loops in N=4
super Yang-Mills. In particular, we focus on the role played by (dual)
conformal symmetry, which is made predictive by deriving anomalous conformal
Ward identities for the Wilson loops. Assuming the duality, the conformal
symmetry of the dual Wilson loops becomes an unexpected new symmetry of
scattering amplitudes in N=4 SYM.


title: Role of cross-shell excitations in the reaction 54Fe(d_pol,p)55Fe

abstract:
  The reaction 54Fe(d_pol,p)55Fe was studied at the Munich Q3D spectrograph
with a 14 MeV polarized deuteron beam. Excitation energies, angular
distributions and analyzing powers were measured for 39 states up to 4.5 MeV
excitation energy. Spin and parity assignments were made and spectroscopic
factors deduced by comparison to DWBA calculations. The results were compared
to predictions by large scale shell model calculations in the full pf-shell and
it was found that reasonable agreement for energies and spectroscopic factors
below 2.5 MeV could only be obtained if up to 6 particles were allowed to be
excited from the f_7/2 orbital into p_3/2, f_5/2, and p_1/2 orbitals across the
N=28 gap. For levels above 2.5 MeV the experimental strength distribution was
found to be significantly more fragmented than predicted by the shell model
calculations.


title: Astronomical imaging: The theory of everything

abstract:
  We are developing automated systems to provide homogeneous calibration
meta-data for heterogeneous imaging data, using the pixel content of the image
alone where necessary. Standardized and complete calibration meta-data permit
generative modeling: A good model of the sky through wavelength and time--that
is, a model of the positions, motions, spectra, and variability of all stellar
sources, plus an intensity map of all cosmological sources--could synthesize or
generate any astronomical image ever taken at any time with any equipment in
any configuration. We argue that the best-fit or highest likelihood model of
the data is also the best possible astronomical catalog constructed from those
data. A generative model or catalog of this form is the best possible platform
for automated discovery, because it is capable of identifying informative
failures of the model in new data at the pixel level, or as statistical
anomalies in the joint distribution of residuals from many images. It is also,
in some sense, an astronomer's "theory of everything".


title: Molecular Tracers of Embedded Star Formation in Ophiuchus

abstract:
  In this paper we analyze nine SCUBA cores in Ophiuchus using the
second-lowest rotational transitions of four molecular species (12CO, 13CO,
C18O, and C17O) to search for clues to the evolutionary state and
star-formation activity within each core. Specifically, we look for evidence of
outflows, infall, and CO depletion. The line wings in the CO spectra are used
to detect outflows, spectral asymmetries in 13CO are used to determine infall
characteristics, and a comparison of the dust emission (from SCUBA
observations) and gas emission (from C18O) is used to determine the fractional
CO freeze-out.
  Through comparison with Spitzer observations of protostellar sources in
Ophiuchus, we discuss the usefulness of CO and its isotopologues as the sole
indicators of the evolutionary state of each core. This study is an important
pilot project for the JCMT Legacy Survey of the Gould Belt (GBS) and the
Galactic Plane (JPS), which intend to complement the SCUBA-2 dust continuum
observations with HARP observations of 12CO, 13CO, C18O, and C17O J = 3 - 2 in
order to determine whether or not the cold dust clumps detected by SCUBA-2 are
protostellar or starless objects.
  Our classification of the evolutionary state of the cores (based on molecular
line maps and SCUBA observations) is in agreement with the Spitzer designation
for six or seven of the nine SCUBA cores. However, several important caveats
exist in the interpretation of these results, many of which large mapping
surveys like the GBS may be able to overcome to provide a clearer picture of
activity in crowded fields.


title: High Resolution Spectroscopy of 16N_Lambda by Electroproduction

abstract:
  An experimental study of the 16O(e,e'K^+)16N_Lambda reaction has been
performed at Jefferson Lab. A thin film of falling water was used as a target.
This permitted a simultaneous measurement of the p(e,e'K^+)Lambda,Sigma_0
exclusive reactions and a precise calibration of the energy scale. A
ground-state binding energy of 13.76 +/- 0.16 MeV was obtained for 16N_Lambda
with better precision than previous measurements on the mirror hypernucleus
16O_Lambda. Precise energies have been determined for peaks arising from a
Lambda in s and p orbits coupled to the p_{1/2} and p_{3/2} hole states of the
15N core nucleus.


title:
Field Compensation of Field Frequency Shifts in the Ramsey Spectroscopy
  of Clock Optical Transitions

abstract:
  We develop the method of Ramsey spectroscopy with the use of an additional
field compensating the frequency shifts of clock optical transitions. This
method in combination with the method of magnetically induced excitation of
strongly forbidden transitions $^1S_0$$\to$$^3P_0$ [A.V. Taichenachev, et al.,
Phys. Rev. Lett. {\bf 96}, 083001 (2006)] allows the practically complete
compensation (down to the fractional level below 10$^{-17}$ with respect to the
unperturbed clock frequency) of field shifts of various origin for even
isotopes of alkaline-earth-like atoms confined to an optical lattice at magic
wavelength (lattice-based atomic clocks). Apart from this, the new method can
be used in the two-photon Doppler-free Ramsey spectroscopy of other forbidden
optical transitions (for example, $^1S_0$$\to$$^1S_0$ and $^1S_0$$\to$$^1D_2$)
and other atoms. This opens perspectives for development of principally new
variants of primary optical frequency standards based on free atoms. As a
whole, the method of the shift-compensating field is distinguished by
simplicity and high efficiency, and it can be applied for any transitions in
any atoms and ions.


title: Contributions to the Geometric and Ergodic Theory of Conservative Flows

abstract:
  We prove the following dichotomy for vector fields in a C1-residual subset of
volume-preserving flows: for Lebesgue almost every point all Lyapunov exponents
equal to zero or its orbit has a dominated splitting. As a consequence if we
have a vector field in this residual that cannot be C1-approximated by a vector
field having elliptic periodic orbits, then, there exists a full measure set
such that every orbit of this set admits a dominated splitting for the linear
Poincare flow. Moreover, we prove that a volume-preserving and C1-stably
ergodic flow can be C1-approximated by another volume-preserving flow which is
non-uniformly hyperbolic.


title:
The inhomogeneous response across the solar disc of unresolved Doppler
  velocity observations

abstract:
  Unresolved Doppler velocity measurements are not homogenous across the solar
disc (Brookes et al. 1978). We consider one cause of the inhomogeneity that
originates from the BiSON instrumentation itself: the intensity of light
observed from a region on the solar disc is dependent on the distance between
that region on the image of the solar disc formed in the instrument and the
detector. The non-uniform weighting affects the realization of the solar noise
and the amplitudes of the solar oscillations observed by a detector. An 'offset
velocity', which varies with time, is observed in BiSON data and has
consequences for the long-term stability of observations. We have attempted to
model, in terms of the inhomogeneous weighting, the average observed offset
velocity.


title: First Measurements of FL at Low Bjorken x

abstract:
  The first measurements of the longitudinal proton structure function FL in
deep inelastic positron-proton scattering at low Bjorken x are described.
Theoretical predictions in higher order QCD and using dipol model calculations
are consistent with the measurements. The data were taken by the HERA
experiments H1 and ZEUS in a series of runs with different proton beam energies
in 2007.


title: Virtual Crossing Number and the Arrow Polynomial

abstract:
  We introduce a new polynomial invariant of virtual knots and links and use
this invariant to compute a lower bound on the virtual crossing number and the
minimal surface genus.


title:
The UKIRT Infrared Deep Sky Survey and the search for the most distant
  quasars

abstract:
  The UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) has the
necessary combination of filters (Y, J, H and K), depth (Y <~ 20.2) and area
coverage (~4000 deg^2) to detect several redshift z >~ 6.4 quasars. The Third
Data Release (DR3) included ~1000 deg^2 of LAS observations which have so far
yielded two previously known z ~= 6 quasars and two new discoveries: ULAS
J0203+0012, at z = 5.72; and ULAS J1319+0950, at z = 6.13.


title: On an extension of Lesche stability

abstract:
  In this paper, we give a new method for proving the Lesche stability of
several functionals(Incomplete entropy, Tsallis entropy, \kappa - entropy,
Quantum-Group entropy). We prove also that the Incomplete q - expectation value
and Renyi entropy for (0 < q < 1) are \alpha - stable for all (0 <\alpha <= q).
Finally, we prove that the Incomplete q - expectation value is \alpha - stable
for all 0 <\alpha <=1.


title: Confinement in Yang--Mills: Elements of a Big Picture

abstract:
  We present a nontechnical review of the current understanding of the
phenomenon of color confinement. The emphasis is put on recent advances. This
is a combined and slightly expanded version of talks delivered at 14th
International QCD Conference "QCD 08," 7-12th July 2008, Montpellier, France,
the International Conference "Quark Confinement and the Hadron Spectrum,"
Mainz, Germany, September 1-6, 2008 (Confinement 08), and the International
Conference "Approaches to Quantum Chromodynamics," Oberwoelz, Austria,
September 7-13, 2008.


title: Generalizing the Cooper-Pair Instability to Doped Mott Insulators

abstract:
  Copper oxides become superconductors rapidly upon doping with electron holes,
suggesting a fundamental pairing instability. The Cooper mechanism explains
normal superconductivity as an instability of a fermi-liquid state, but
high-temperature superconductors derive from a Mott-insulator normal state, not
a fermi liquid. We show that precocity to pair condensation with doping is a
natural property of competing antiferromagnetism and d-wave superconductivity
on a singly-occupied lattice, thus generalizing the Cooper instability to doped
Mott insulators, with significant implications for the high-temperature
superconducting mechanism.


title: Perturbative Estimates of Lepton Mixing Angles in Unified Models

abstract:
  Many unified models predict two large neutrino mixing angles, with the
charged lepton mixing angles being small and quark-like, and the neutrino
masses being hierarchical. Assuming this, we present simple approximate
analytic formulae giving the lepton mixing angles in terms of the underlying
high energy neutrino mixing angles together with small perturbations due to
both charged lepton corrections and renormalisation group (RG) effects,
including also the effects of third family canonical normalization (CN). We
apply the perturbative formulae to the ubiquitous case of tri-bimaximal
neutrino mixing at the unification scale, in order to predict the theoretical
corrections to mixing angle predictions and sum rule relations, and give a
general discussion of all limiting cases.


title: A family of determinants associated with a square matrix

abstract:
  We associate with a matrix over an arbitrary field an infinite family of
matrices whose sizes vary from one to infinity; their entries are traces of
powers of the original matrix. We explicitly evaluate the determinants of
matrices in our family. The work is motivated by applications to graph spectra.


title:
Relationship between Diversity and Perfomance of Multiple Classifiers
  for Decision Support

abstract:
  The paper presents the investigation and implementation of the relationship
between diversity and the performance of multiple classifiers on classification
accuracy. The study is critical as to build classifiers that are strong and can
generalize better. The parameters of the neural network within the committee
were varied to induce diversity; hence structural diversity is the focus for
this study. The hidden nodes and the activation function are the parameters
that were varied. The diversity measures that were adopted from ecology such as
Shannon and Simpson were used to quantify diversity. Genetic algorithm is used
to find the optimal ensemble by using the accuracy as the cost function. The
results observed shows that there is a relationship between structural
diversity and accuracy. It is observed that the classification accuracy of an
ensemble increases as the diversity increases. There was an increase of 3%-6%
in the classification accuracy.


title:
Fermionic correlation functions from the staggered Schr\"odinger
  functional

abstract:
  We consider the Schr\"odinger functional with staggered one-component
fermions on a fine lattice of size $(L/a)^3 \times (T/a)$ where $T/a$ must be
an odd number. In order to reconstruct the four-component spinors, two
different set-ups are proposed, corresponding to the coarse lattice having size
$(L/2a)^3 \times (T'/2a)$, with $T' = T \pm a$. The continuum limit is then
defined at fixed $T'/L$. Both cases have previously been investigated in the
pure gauge theory. Here we define fermionic correlation functions and study
their approach to the continuum limit at tree-level of perturbation theory.


title:
Radiative capture of nucleons at astrophysical energies with
  single-particle states

abstract:
  Radiative capture of nucleons at energies of astrophysical interest is one of
the most important processes for nucleosynthesis. The nucleon capture can occur
either by a compound nucleus reaction or by a direct process. The compound
reaction cross sections are usually very small, specially for light nuclei. The
direct capture proceeds either via the formation of a single-particle
resonance, or a non-resonant capture process. In this work we calculate
radiative capture cross sections and astrophysical S-factors for nuclei in the
mass region A<20 using single-particle states. We carefully discuss the
parameter fitting procedure adopted in the simplified two-body treatment of the
capture process. Then we produce a detailed list of cases for which the model
works well. Useful quantities, such as spectroscopic factors and asymptotic
normalization coefficients, are obtained and compared to published data.


title: The KdV/KP-I limit of the Nonlinear Schrodinger equation

abstract:
  We justify rigorously the convergence of the amplitude of solutions of
Nonlinear-Schr\"odinger type Equations with non zero limit at infinity to an
asymptotic regime governed by the Korteweg-de Vries equation in dimension 1 and
the Kadomtsev-Petviashvili I equation in dimensions 2 and more. We get two
types of results. In the one-dimensional case, we prove directly by energy
bounds that there is no vortex formation for the global solution of the NLS
equation in the energy space and deduce from this the convergence towards the
unique solution in the energy space of the KdV equation. In arbitrary
dimensions, we use an hydrodynamic reformulation of NLS and recast the problem
as a singular limit for an hyperbolic system. We thus prove that smooth $H^s$
solutions exist on a time interval independent of the small parameter. We then
pass to the limit by a compactness argument and obtain the KdV/KP-I equation.


title: Power Control in Two-Tier Femtocell Networks

abstract:
  In a two tier cellular network -- comprised of a central macrocell underlaid
with shorter range femtocell hotspots -- cross-tier interference limits overall
capacity with universal frequency reuse. To quantify near-far effects with
universal frequency reuse, this paper derives a fundamental relation providing
the largest feasible cellular Signal-to-Interference-Plus-Noise Ratio (SINR),
given any set of feasible femtocell SINRs. We provide a link budget analysis
which enables simple and accurate performance insights in a two-tier network. A
distributed utility-based SINR adaptation at femtocells is proposed in order to
alleviate cross-tier interference at the macrocell from cochannel femtocells.
The Foschini-Miljanic (FM) algorithm is a special case of the adaptation. Each
femtocell maximizes their individual utility consisting of a SINR based reward
less an incurred cost (interference to the macrocell). Numerical results show
greater than 30% improvement in mean femtocell SINRs relative to FM. In the
event that cross-tier interference prevents a cellular user from obtaining its
SINR target, an algorithm is proposed that reduces transmission powers of the
strongest femtocell interferers. The algorithm ensures that a cellular user
achieves its SINR target even with 100 femtocells/cell-site, and requires a
worst case SINR reduction of only 16% at femtocells. These results motivate
design of power control schemes requiring minimal network overhead in two-tier
networks with shared spectrum.


title: Asymptotic Vassiliev Invariants for Vector Fields

abstract:
  We analyse the asymptotical growth of Vassiliev invariants on non-periodic
flow lines of ergodic vector fields on domains of $\R^3$. More precisely, we
show that the asymptotics of Vassiliev invariants is completely determined by
the helicity of the vector field. As an application, we determine the
asymptotic Alexander and Jones polynomials and give a formula for the
asymptotic Kontsevich integral.


title: Flavor changing neutral currents with a fourth family of quarks

abstract:
  For a model with a fourth family of quarks, new sources of flavor changing
neutral currents are identified by confronting the unitary 4x4 quark mixing
matrix with the experimental measured values of the familiar 3x3 quark mixing
matrix. By imposing as experimental constraints the known bounds for the flavor
changing neutral currents, the largest mixing of the known quarks with the
fourth family ones is established. The predictions are: a value for |V_{tb}|
significantly different from unity, large rates for rare top decays as
t->c\gamma and t->cZ, the last one reachable at the Large Hadrion Collider, and
large rates for rare strange decays s->d\gamma and s->dg, where g stands for
the gluon field.


title:
Observation of three-dimensional behavior in surface states of bismuth
  nanowires and the evidence for bulk Bi charge fractionalization

abstract:
  Whereas bulk bismuth supports very-high mobility, light, Dirac electrons and
holes in its interior, its boundaries support a layer of heavy electrons in
surface states formed by spin orbit interaction in the presence of the surface
electric field. Small diameter d trigonal Bi nanowires (30 nm < d < 200 nm)
were studied via magnetotransport at low temperatures and for fields up to 14 T
in order to investigate the role of surfaces in electronic transport. A
two-dimensional behavior was expected for surface charges; however we found
instead a three-dimensional behavior, with a rich spectrum of Landau levels in
a nearly spherical Fermi surface. This is associated with the long penetration
length of surface states of trigonal wires. The prospect of the participation
of surface transport and surface-induced relaxation of bulk carriers in the
electronic properties of macroscopic samples is evaluated. We show that recent
observations of magnetoquantum peaks in the Nernst thermopower coefficient,
attributed to two-dimensional electron gas charge fractionalization, can be
more plausibly interpreted in terms of these surface states.


title:
Evidence of WW+WZ production with lepton + jets final states in
  proton-antiproton collisions at sqrt(s)=1.96 TeV

abstract:
  We present the first evidence of WW+WZ production with lepton+jets final
states at a hadron collider. The data correspond to 1.07 inverse femtobarns of
integrated luminosity collected with the D0 detector at the Fermilab Tevatron
Collider in proton-antiproton collisions at sqrt(s)=1.96 TeV. The observed
cross section for WW+WZ production is 20.2 +/- 4.5 pb, consistent with the SM
prediction of 16.1 +/- 0.9 pb. The probability for background fluctuations to
produce an excess equal to or larger than that observed is estimated to be
5.4e-6, corresponding to a significance of 4.4 standard deviations.


title:
Spectral and regularity properties of an operator calculus related to
  Landau quantization

abstract:
  The theme of this work is that the theory of charged particles in a uniform
magnetic field can be generalized to a large class of operators if one uses an
extended a class of Weyl operators which we call "Landau--Weyl
pseudodifferential operators". The link between standard Weyl calculus and
Landau--Weyl calculus is made explicit by the use of an infinite family of
intertwining "windowed wavepacket transforms"; this makes possible the use of
the theory of modulation spaces to study various regularity properties. Our
techniques allow us not only to recover easily the eigenvalues and
eigenfunctions of the Hamiltonian operator of a charged particle in a uniform
magnetic field, but also to prove global hypoellipticity results and to study
the regularity of the solutions to Schroedinger equations.


title: The INTEGRAL-OMC Scientific Archive

abstract:
  The Optical Monitoring Camera (OMC) on-board the INTEGRAL satellite has, as
one of its scientific goals, the observation of a large number of variable
sources previously selected. After almost 6 years of operations, OMC has
monitored more than 100 000 sources of scientific interest. In this
contribution we present the OMC Scientific Archive
(http://sdc.laeff.inta.es/omc/) which has been developed to provide the
astronomical community with a quick access to the light curves generated by
this instrument.We describe the main characteristics of this archive, as well
as important aspects for the users: object types, temporal sampling of light
curves and photometric accuracy.


title: Four-body legacy of the Efimov effect

abstract:
  Armed with a new solution to the four-body problem, we reanalyze the recent
Innsbruck observation of an Efimov resonance in three-body collisions of cesium
atoms, and show that it provides evidence of new, universal four-body physics
as well. Our theoretical treatment of four bosonic atoms in the limit of strong
two-body attraction suggests a ubiquitous result: namely, that resonantly-bound
states of all four atoms should occur whenever the two-body scattering length
is a specific fraction (0.43) of the value where a three-body Efimov resonance
occurs. A hitherto unanalyzed feature in the 2006 Innsbruck experiment supports
this universal prediction, and it provides the first known evidence to date
that a direct four-body recombination process plays a role. While we confirm
the conclusion reached previously by some studies that no true Efimov effect
exists for four particles, we demonstrate the existence of a universal class of
four-body states that are intimately connected with three-body Efimov states.


title: Simple models for scaling in phylogenetic trees

abstract:
  Many processes and models --in biological, physical, social, and other
contexts-- produce trees whose depth scales logarithmically with the number of
leaves. Phylogenetic trees, describing the evolutionary relationships between
biological species, are examples of trees for which such scaling is not
observed. With this motivation, we analyze numerically two branching models
leading to non-logarithmic scaling of the depth with the number of leaves. For
Ford's alpha model, although a power-law scaling of the depth with tree size
was established analytically, our numerical results illustrate that the
asymptotic regime is approached only at very large tree sizes. We introduce
here a new model, the activity model, showing analytically and numerically that
it also displays a power-law scaling of the depth with tree size at a critical
parameter value.


title:
Study of D0 --> pi- e+ nu(e), D+ --> pi0 e+ nu(e), D0 --> K- e+ nu(e),
  and D+ --> anti-K0 e+ nu(e) in Tagged Decays of the psi(3770) Resonance

abstract:
  Using psi(3770) --> DDbar events collected with the CLEO-c detector at the
Cornell e+ e- storage ring, tagged by fully reconstructing one D meson in a
hadronic decay mode, we measure absolute branching fractions and differential
decay rates for D0 --> pi- e+ nu(e), D+ --> pi0 e+ nu(e), D0 --> K- e+ nu(e),
and D+ --> anti-K0 e+ nu(e). The measured decay rates are used to study
semileptonic form factors governing these transitions and to test unquenched
Lattice QCD (LQCD) calculations. We average our results with previously
published CLEO-c measurements of the same quantities using a neutrino
reconstruction technique. Combining LQCD calculations of form factor absolute
normalizations f+(0) and measurements of f(pi)+(0)*|Vcd| and f(K)+(0)*|Vcs|, we
find |Vcd| = 0.223(8)(3)(23) and |Vcs| = 1.019(10)(7)(106), where the
uncertainties are statistical, experimental systematic, and from LQCD,
respectively.


title: Integrable pseudopotentials related to elliptic curves

abstract:
  We construct integrable pseudopotentials with an arbitrary number of fields
in terms of elliptic generalization of hypergeometric functions in several
variables. These pseudopotentials yield some integrable (2+1)-dimensional
hydrodynamic type systems. An interesting class of integrable (1+1)-dimensional
hydrodynamic type systems is also generated by our pseudopotentials.


title: The space of volume forms

abstract:
  S. Donaldson introduced a metric on the space of volume forms, with fixed
total volume on any compact Riemmanian manifold. With this metric, the space of
volume forms formally has non-positive curvature. The geodesic equation is a
fully nonlinear degenerate elliptic equation. We solve the geodesic equation
and its perturbed equation and prove that the space of volume forms is an
infinite dimensional non-positively curved metric space in the sense of
Alexandrov.


title:
Corrigendum to "Approximation by C^{p}-smooth, Lipschitz functions on
  Banach spaces" [J. Math. Anal. Appl., 315 (2006), 599-605]

abstract:
  In this erratum, we recover the results from an earlier paper of the author's
which contained a gap. Specifically, we prove that if X is a Banach space with
an unconditional basis and admits a C^{p}-smooth, Lipschitz bump function, and
Y is a convex subset of X, then any uniformly continuous function f: Y->R can
be uniformly approximated by Lipschitz, C^{p}-smooth functions K:X->R. Also, if
Z is any Banach space and f:X->Z is L-Lipschitz, then the approximates K:X->Z
can be chosen CL-Lipschitz and C^{p}-smooth, for some constant C depending only
on X.


title:
Solar Forcing of the Streamflow of a Continental Scale South American
  River

abstract:
  Solar forcing on climate has been reported in several studies although the
evidence so far remains inconclusive. Here, we analyze the stream flow of one
of the largest rivers in the world, the Parana in southeastern South America.
For the last century, we find a strong correlation with the sunspot number, in
multidecadal time scales, and with larger solar activity corresponding to
larger stream flow. The correlation coefficient is r=0.78, significant to a 99%
level. In shorter time scales we find a strong correlation with El Nino. These
results are a step toward flood prediction, which might have great social and
economic impacts.

categories: physics.ao-ph astro-ph physics.geo-ph physics.space-ph


title: A note on sigular time of mean curvature flow

abstract:
  We show that mean curvature flow of a compact submanifold in a complete
Riemannian manifold cannot form singularity at time infinity if the ambient
Riemannian manifold has bounded geometry and satisfies certain curvature and
volume growth conditions .


title: Infinitesimal adjunction and polar curves

abstract:
  The polar curves of foliations $\mathcal F$ having a curve $C$ of
separatrices generalize the classical polar curves associated to hamiltonian
foliations of $C$. As in the classical theory, the equisingularity type
${\wp}({\mathcal F})$ of a generic polar curve depends on the analytical type
of ${\mathcal F}$, and hence of $C$. In this paper we find the equisingularity
types $\epsilon (C)$ of $C$, that we call kind singularities, such that
${\wp}({\mathcal F})$ is completely determined by $\epsilon (C)$ for
Zariski-general foliations $\mathcal F$. Our proofs are mainly based on the
adjunction properties of the polar curves. The foliation-like framework is
necessary, otherwise we do not get the right concept of general foliation in
Zariski sense and, as we show by examples, the hamiltonian case can be out of
the set of general foliations.


title:
Landau quantization for a neutral particle in presence of topological
  defects

abstract:
  In this paper we study the Landau levels in the non-relativistic dynamics of
a neutral particle which possesses a permanent magnetic dipole moment
interacting with an external electric field in the curved spacetime background
with the presence or absence of a torsion field. The eigenfunction and
eigenvalues of Hamiltonian are obtained. We show that the presence of the
topological defect breaks the infinite degeneracy of the Landau levels arising
in this system. We also apply a duality transformation to discuss this same
quantization for a dynamics of a neutral particle with a permanent electric
dipole moment.


title: Super-Dense Matter at Super- Strong Magnetic Fields

abstract:
  Our Universe is full of regions where extreme physical conditions are
realized. A most intriguing case is the super-dense core of neutron stars, some
of which also have super-strong magnetic fields, hence called magnetars. In
this paper we review the current understanding of the physical properties of
the different phases of quark matter at very high densities in the presence of
large magnetic fields. We also discuss how the Meissner instability produced at
moderate densities by a pairing stress due to the medium neutrality and
$\beta$-equilibrium constraints can lead to the spontaneous generation of a
magnetic field.


title: The Nernst effect and the boundaries of the Fermi liquid picture

abstract:
  Following the observation of an anomalous Nernst signal in cuprates, the
Nernst effect was explored in a variety of metals and superconductors during
the past few years. This paper reviews the results obtained during this
exploration, focusing on the Nernst response of normal quasi-particles as
opposed to the one generated by superconducting vortices or by short-lived
Cooper pairs. Contrary to what has been often assumed, the so-called Sondheimer
cancelation does not imply a negligible Nernst response in a Fermi liquid. In
fact, the amplitude of the Nernst response measured in various metals in the
low-temperature limit is scattered over six orders of magnitude. According to
the data, this amplitude is roughly set by the ratio of electron mobility to
Fermi energy in agreement with the implications of the semi-classical transport
theory.


title: Quaternionic contact manifolds with a closed fundamental 4-form

abstract:
  We show that the fundamental 4-form on a quaternionic contact manifold of
dimension at least eleven is closed if and only if the torsion endomorphism of
the Biquard connection vanishes. This condition characterizes quaternionic
contact structures which are locally qc homothetic to 3-Sasakian structures.


title:
Next-to-leading order QCD corrections to the top quark decay via
  model-independent FCNC couplings

abstract:
  D0 and CDF collaborations at the Fermilab Tevatron have searched for
non-standard-model single top-quark production and set upper limits on the
anomalous top quark flavor-changing neutral current (FCNC) couplings
$\kappa^g_{tc}/\Lambda$ and $\kappa^g_{tu}/\Lambda$ using the measurement of
total cross section calculated at the next-to-leading order (NLO) in QCD. In
this Letter, we report on the effect of anomalous FCNC couplings to various
decay branching ratios of the top quark, calculated at the NLO. This result is
not only mandatory for a consistent treatment of both the top quark production
and decay via FCNC couplings by D0 and CDF at the Tevatron but is also
important for the study of ATLAS and CMS sensitivity to these anomalous
couplings at the CERN LHC. We find that the NLO corrections to the partial
decay widths of the three decay channels $ t\to q + g$, $ t\to q + \gamma$ and
$ t\to q + Z$ are at the order of 10% in magnitude and modify their branching
ratios by about 20%, 0.4% and 2%, respectively, as compared to their leading
order predictions.


title: Rapid onset of collectivity in the vicinity of 78Ni

abstract:
  gamma-rays following the B and B-n decay of the very neutron rich 84Ga
produced by photo-fission of 238U have been studied at the newly built ISOL
facility of IPN Orsay: ALTO. Two activities were observed and assigned to two
B-decaying states: 84gGa, I = (0\^-) and 84mGa, I = (3\^-, 4\^-). Excitation
energies of the 2+1 and 4+1 excited states of 84Ge were measured at E(2+1) =
624.3 keV and E(4+1) = 1670.1 keV. Comparison with HFB+GCM calculations allows
to establish the collective character of this nucleus indicating a substantial
N=50 core polarization. The excitation energy of the 1/2+1 state in 83Ga known
to carry a large part of the neutron 3s1/2 strength was measured at 247.8keV.
Altogether these data allow to confirm the new single particle state ordering
which appears immediately after the double Z=28 and N=50 shell closure and to
designate 78Ni as a fragile and easily polarized doubly-magic core.


title:
Control Theoretic Formulation of Capacity of Dynamic Electro Magnetic
  Channels

abstract:
  In this paper nonhomogeneous deterministic and stochastic Maxwell equations
are used to rigorously formulate the capacity of electromagnetic channels such
as wave guides (cavities, coaxial cables etc). Both distributed, but localized,
and Dirichlet boundary data are considered as the potential input sources. We
prove the existence of a source measure, satisfying certain second order
constraints (equivalent to power constraints), at which the channel capacity is
attained. Further, necessary and sufficient conditions for optimality are
presented.


title: Cycle factorizations and one-faced graph embeddings

abstract:
  Consider factorizations into transpositions of an n-cycle in the symmetric
group S_n. To every such factorization we assign a monomial in variables w_{ij}
that retains the transpositions used, but forgets their order. Summing over all
possible factorizations of n-cycles we obtain a polynomial that happens to
admit a closed expression. From this expression we deduce a formula for the
number of 1-faced embeddings of a given graph.


title:
On Wigner functions and a damped star product in dissipative phase-space
  quantum mechanics

abstract:
  Dito and Turrubiates recently introduced an interesting model of the
dissipative quantum mechanics of a damped harmonic oscillator in phase space.
Its key ingredient is a non-Hermitian deformation of the Moyal star product
with the damping constant as deformation parameter. We compare the
Dito-Turrubiates scheme with phase-space quantum mechanics (or deformation
quantization) based on other star products, and extend it to incorporate Wigner
functions. The deformed (or damped) star product is related to a complex
Hamiltonian, and so necessitates a modified equation of motion involving
complex conjugation. We find that with this change the Wigner function
satisfies the classical equation of motion. This seems appropriate since
non-dissipative systems with quadratic Hamiltonians share this property.


title: VHE Gamma-ray Afterglow Emission from Nearby GRBs

abstract:
  Gamma-ray Bursts (GRBs) are among the potential extragalactic sources of
very-high-energy (VHE) gamma-rays. We discuss the prospects of detecting VHE
gamma-rays with current ground-based Cherenkov instruments during the afterglow
phase. Using the fireball model, we calculate the synchrotron self-Compton
(SSC) emission from forward-shock electrons. The modeled results are compared
with the observational afterglow data taken with and/or the sensitivity level
of ground-based VHE instruments (e.g. STACEE, H.E.S.S., MAGIC, VERITAS, and
Whipple). We find that modeled SSC emission from bright and nearby bursts such
as GRB 030329 are detectable by these instruments even with a delayed
observation time of ~10 hours.


title: On continuous choice of retractions onto nonconvex subsets

abstract:
  For a Banach space $B$ and for a class $\A$ of its bounded closed retracts,
endowed with the Hausdorff metric, we prove that retractions on elements $A \in
\A$ can be chosen to depend continuously on $A$, whenever nonconvexity of each
$A \in \A$ is less than $\f{1}{2}$. The key geometric argument is that the set
of all uniform retractions onto an $\a-$paraconvex set (in the spirit of E.
Michael) is $\frac{\a}{1-\a}-$paraconvex subset in the space of continuous
mappings of $B$ into itself. For a Hilbert space $H$ the estimate
$\frac{\a}{1-\a}$ can be improved to $\frac{\a (1+\a^{2})}{1-\a^{2}}$ and the
constant $\f{1}{2}$ can be reduced to the root of the equation $\a+
\a^{2}+a^{3}=1$.


title: On the homotopy classification of maps

abstract:
  We establish certain conditions which imply that a map $f:X\to Y$ of
topological spaces is null homotopic when the induced integral cohomology
homomorphism is trivial; one of them is: $H^*(X)$ and $\pi_*(Y)$ have no
torsion and $H^*(Y)$ is polynomial.


title:
Weakly coupled N=4 Super Yang-Mills and N=6 Chern-Simons theories from
  u(2|2) Yangian symmetry

abstract:
  In this paper we derive the universal R-matrix for the Yangian Y(u(2|2)),
which is an abstract algebraic object leading to rational solutions of the
Yang-Baxter equation on representations. We find that on the fundamental
representation the universal R-matrix reduces to the standard rational R-matrix
R = R_0(1 + P/u), where the scalar prefactor is surprisingly simple compared to
prefactors one finds e.g. for sl(n) R-matrices. This leads precisely to the
S-matrix giving the Bethe Ansatz of one-loop N = 4 Super Yang-Mills theory and
two-loop N = 6 Chern-Simons theory.


title:
Structurally damped plate and wave equations with random point force in
  arbitrary space dimensions

abstract:
  In this paper we consider structurally damped plate and wave equations with
point and distributed random forces. In order to treat space dimensions more
than one, we work in the setting of $L^q$--spaces with (possibly small)
$q\in(1,2)$. We establish existence, uniqueness and regularity of mild and weak
solutions to the stochastic equations employing recent theory for stochastic
evolution equations in UMD Banach spaces.